drivers/usb/typec/tcpm/tcpm.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright 2015-2017 Google, Inc
   4  *
   5  * USB Power Delivery protocol stack.
   6  */
   7
   8 #include <linux/completion.h>
   9 #include <linux/debugfs.h>
  10 #include <linux/device.h>
  11 #include <linux/hrtimer.h>
  12 #include <linux/jiffies.h>
  13 #include <linux/kernel.h>
  14 #include <linux/kthread.h>
  15 #include <linux/module.h>
  16 #include <linux/mutex.h>
  17 #include <linux/power_supply.h>
  18 #include <linux/proc_fs.h>
  19 #include <linux/property.h>
  20 #include <linux/sched/clock.h>
  21 #include <linux/seq_file.h>
  22 #include <linux/slab.h>
  23 #include <linux/spinlock.h>
  24 #include <linux/usb.h>
  25 #include <linux/usb/pd.h>
  26 #include <linux/usb/pd_ado.h>
  27 #include <linux/usb/pd_bdo.h>
  28 #include <linux/usb/pd_ext_sdb.h>
  29 #include <linux/usb/pd_vdo.h>
  30 #include <linux/usb/role.h>
  31 #include <linux/usb/tcpm.h>
  32 #include <linux/usb/typec_altmode.h>
  33
  34 #include <uapi/linux/sched/types.h>
  35
  36 #define FOREACH_STATE(S)                        \
  37         S(INVALID_STATE),                       \
  38         S(TOGGLING),                    \
  39         S(CHECK_CONTAMINANT),                   \
  40         S(SRC_UNATTACHED),                      \
  41         S(SRC_ATTACH_WAIT),                     \
  42         S(SRC_ATTACHED),                        \
  43         S(SRC_STARTUP),                         \
  44         S(SRC_SEND_CAPABILITIES),               \
  45         S(SRC_SEND_CAPABILITIES_TIMEOUT),       \
  46         S(SRC_NEGOTIATE_CAPABILITIES),          \
  47         S(SRC_TRANSITION_SUPPLY),               \
  48         S(SRC_READY),                           \
  49         S(SRC_WAIT_NEW_CAPABILITIES),           \
  50                                                 \
  51         S(SNK_UNATTACHED),                      \
  52         S(SNK_ATTACH_WAIT),                     \
  53         S(SNK_DEBOUNCED),                       \
  54         S(SNK_ATTACHED),                        \
  55         S(SNK_STARTUP),                         \
  56         S(SNK_DISCOVERY),                       \
  57         S(SNK_DISCOVERY_DEBOUNCE),              \
  58         S(SNK_DISCOVERY_DEBOUNCE_DONE),         \
  59         S(SNK_WAIT_CAPABILITIES),               \
  60         S(SNK_NEGOTIATE_CAPABILITIES),          \
  61         S(SNK_NEGOTIATE_PPS_CAPABILITIES),      \
  62         S(SNK_TRANSITION_SINK),                 \
  63         S(SNK_TRANSITION_SINK_VBUS),            \
  64         S(SNK_READY),                           \
  65                                                 \
  66         S(ACC_UNATTACHED),                      \
  67         S(DEBUG_ACC_ATTACHED),                  \
  68         S(AUDIO_ACC_ATTACHED),                  \
  69         S(AUDIO_ACC_DEBOUNCE),                  \
  70                                                 \
  71         S(HARD_RESET_SEND),                     \
  72         S(HARD_RESET_START),                    \
  73         S(SRC_HARD_RESET_VBUS_OFF),             \
  74         S(SRC_HARD_RESET_VBUS_ON),              \
  75         S(SNK_HARD_RESET_SINK_OFF),             \
  76         S(SNK_HARD_RESET_WAIT_VBUS),            \
  77         S(SNK_HARD_RESET_SINK_ON),              \
  78                                                 \
  79         S(SOFT_RESET),                          \
  80         S(SRC_SOFT_RESET_WAIT_SNK_TX),          \
  81         S(SNK_SOFT_RESET),                      \
  82         S(SOFT_RESET_SEND),                     \
  83                                                 \
  84         S(DR_SWAP_ACCEPT),                      \
  85         S(DR_SWAP_SEND),                        \
  86         S(DR_SWAP_SEND_TIMEOUT),                \
  87         S(DR_SWAP_CANCEL),                      \
  88         S(DR_SWAP_CHANGE_DR),                   \
  89                                                 \
  90         S(PR_SWAP_ACCEPT),                      \
  91         S(PR_SWAP_SEND),                        \
  92         S(PR_SWAP_SEND_TIMEOUT),                \
  93         S(PR_SWAP_CANCEL),                      \
  94         S(PR_SWAP_START),                       \
  95         S(PR_SWAP_SRC_SNK_TRANSITION_OFF),      \
  96         S(PR_SWAP_SRC_SNK_SOURCE_OFF),          \
  97         S(PR_SWAP_SRC_SNK_SOURCE_OFF_CC_DEBOUNCED), \
  98         S(PR_SWAP_SRC_SNK_SINK_ON),             \
  99         S(PR_SWAP_SNK_SRC_SINK_OFF),            \
 100         S(PR_SWAP_SNK_SRC_SOURCE_ON),           \
 101         S(PR_SWAP_SNK_SRC_SOURCE_ON_VBUS_RAMPED_UP),    \
 102                                                 \
 103         S(VCONN_SWAP_ACCEPT),                   \
 104         S(VCONN_SWAP_SEND),                     \
 105         S(VCONN_SWAP_SEND_TIMEOUT),             \
 106         S(VCONN_SWAP_CANCEL),                   \
 107         S(VCONN_SWAP_START),                    \
 108         S(VCONN_SWAP_WAIT_FOR_VCONN),           \
 109         S(VCONN_SWAP_TURN_ON_VCONN),            \
 110         S(VCONN_SWAP_TURN_OFF_VCONN),           \
 111                                                 \
 112         S(FR_SWAP_SEND),                        \
 113         S(FR_SWAP_SEND_TIMEOUT),                \
 114         S(FR_SWAP_SNK_SRC_TRANSITION_TO_OFF),                   \
 115         S(FR_SWAP_SNK_SRC_NEW_SINK_READY),              \
 116         S(FR_SWAP_SNK_SRC_SOURCE_VBUS_APPLIED), \
 117         S(FR_SWAP_CANCEL),                      \
 118                                                 \
 119         S(SNK_TRY),                             \
 120         S(SNK_TRY_WAIT),                        \
 121         S(SNK_TRY_WAIT_DEBOUNCE),               \
 122         S(SNK_TRY_WAIT_DEBOUNCE_CHECK_VBUS),    \
 123         S(SRC_TRYWAIT),                         \
 124         S(SRC_TRYWAIT_DEBOUNCE),                \
 125         S(SRC_TRYWAIT_UNATTACHED),              \
 126                                                 \
 127         S(SRC_TRY),                             \
 128         S(SRC_TRY_WAIT),                        \
 129         S(SRC_TRY_DEBOUNCE),                    \
 130         S(SNK_TRYWAIT),                         \
 131         S(SNK_TRYWAIT_DEBOUNCE),                \
 132         S(SNK_TRYWAIT_VBUS),                    \
 133         S(BIST_RX),                             \
 134                                                 \
 135         S(GET_STATUS_SEND),                     \
 136         S(GET_STATUS_SEND_TIMEOUT),             \
 137         S(GET_PPS_STATUS_SEND),                 \
 138         S(GET_PPS_STATUS_SEND_TIMEOUT),         \
 139                                                 \
 140         S(GET_SINK_CAP),                        \
 141         S(GET_SINK_CAP_TIMEOUT),                \
 142                                                 \
 143         S(ERROR_RECOVERY),                      \
 144         S(PORT_RESET),                          \
 145         S(PORT_RESET_WAIT_OFF),                 \
 146                                                 \
 147         S(AMS_START),                           \
 148         S(CHUNK_NOT_SUPP)
 149
 150 #define FOREACH_AMS(S)                          \
 151         S(NONE_AMS),                            \
 152         S(POWER_NEGOTIATION),                   \
 153         S(GOTOMIN),                             \
 154         S(SOFT_RESET_AMS),                      \
 155         S(HARD_RESET),                          \
 156         S(CABLE_RESET),                         \
 157         S(GET_SOURCE_CAPABILITIES),             \
 158         S(GET_SINK_CAPABILITIES),               \
 159         S(POWER_ROLE_SWAP),                     \
 160         S(FAST_ROLE_SWAP),                      \
 161         S(DATA_ROLE_SWAP),                      \
 162         S(VCONN_SWAP),                          \
 163         S(SOURCE_ALERT),                        \
 164         S(GETTING_SOURCE_EXTENDED_CAPABILITIES),\
 165         S(GETTING_SOURCE_SINK_STATUS),          \
 166         S(GETTING_BATTERY_CAPABILITIES),        \
 167         S(GETTING_BATTERY_STATUS),              \
 168         S(GETTING_MANUFACTURER_INFORMATION),    \
 169         S(SECURITY),                            \
 170         S(FIRMWARE_UPDATE),                     \
 171         S(DISCOVER_IDENTITY),                   \
 172         S(SOURCE_STARTUP_CABLE_PLUG_DISCOVER_IDENTITY), \
 173         S(DISCOVER_SVIDS),                      \
 174         S(DISCOVER_MODES),                      \
 175         S(DFP_TO_UFP_ENTER_MODE),               \
 176         S(DFP_TO_UFP_EXIT_MODE),                \
 177         S(DFP_TO_CABLE_PLUG_ENTER_MODE),        \
 178         S(DFP_TO_CABLE_PLUG_EXIT_MODE),         \
 179         S(ATTENTION),                           \
 180         S(BIST),                                \
 181         S(UNSTRUCTURED_VDMS),                   \
 182         S(STRUCTURED_VDMS),                     \
 183         S(COUNTRY_INFO),                        \
 184         S(COUNTRY_CODES)
 185
 186 #define GENERATE_ENUM(e)        e
 187 #define GENERATE_STRING(s)      #s
 188
 189 enum tcpm_state {
 190         FOREACH_STATE(GENERATE_ENUM)
 191 };
 192
 193 static const char * const tcpm_states[] = {
 194         FOREACH_STATE(GENERATE_STRING)
 195 };
 196
 197 enum tcpm_ams {
 198         FOREACH_AMS(GENERATE_ENUM)
 199 };
 200
 201 static const char * const tcpm_ams_str[] = {
 202         FOREACH_AMS(GENERATE_STRING)
 203 };
 204
 205 enum vdm_states {
 206         VDM_STATE_ERR_BUSY = -3,
 207         VDM_STATE_ERR_SEND = -2,
 208         VDM_STATE_ERR_TMOUT = -1,
 209         VDM_STATE_DONE = 0,
 210         /* Anything >0 represents an active state */
 211         VDM_STATE_READY = 1,
 212         VDM_STATE_BUSY = 2,
 213         VDM_STATE_WAIT_RSP_BUSY = 3,
 214         VDM_STATE_SEND_MESSAGE = 4,
 215 };
 216
 217 enum pd_msg_request {
 218         PD_MSG_NONE = 0,
 219         PD_MSG_CTRL_REJECT,
 220         PD_MSG_CTRL_WAIT,
 221         PD_MSG_CTRL_NOT_SUPP,
 222         PD_MSG_DATA_SINK_CAP,
 223         PD_MSG_DATA_SOURCE_CAP,
 224 };
 225
 226 enum adev_actions {
 227         ADEV_NONE = 0,
 228         ADEV_NOTIFY_USB_AND_QUEUE_VDM,
 229         ADEV_QUEUE_VDM,
 230         ADEV_QUEUE_VDM_SEND_EXIT_MODE_ON_FAIL,
 231         ADEV_ATTENTION,
 232 };
 233
 234 /*
 235  * Initial current capability of the new source when vSafe5V is applied during PD3.0 Fast Role Swap.
 236  * Based on "Table 6-14 Fixed Supply PDO - Sink" of "USB Power Delivery Specification Revision 3.0,
 237  * Version 1.2"
 238  */
 239 enum frs_typec_current {
 240         FRS_NOT_SUPPORTED,
 241         FRS_DEFAULT_POWER,
 242         FRS_5V_1P5A,
 243         FRS_5V_3A,
 244 };
 245
 246 /* Events from low level driver */
 247
 248 #define TCPM_CC_EVENT           BIT(0)
 249 #define TCPM_VBUS_EVENT         BIT(1)
 250 #define TCPM_RESET_EVENT        BIT(2)
 251 #define TCPM_FRS_EVENT          BIT(3)
 252 #define TCPM_SOURCING_VBUS      BIT(4)
 253 #define TCPM_PORT_CLEAN         BIT(5)
 254
 255 #define LOG_BUFFER_ENTRIES      1024
 256 #define LOG_BUFFER_ENTRY_SIZE   128
 257
 258 /* Alternate mode support */
 259
 260 #define SVID_DISCOVERY_MAX      16
 261 #define ALTMODE_DISCOVERY_MAX   (SVID_DISCOVERY_MAX * MODE_DISCOVERY_MAX)
 262
 263 #define GET_SINK_CAP_RETRY_MS   100
 264 #define SEND_DISCOVER_RETRY_MS  100
 265
 266 struct pd_mode_data {
 267         int svid_index;         /* current SVID index           */
 268         int nsvids;
 269         u16 svids[SVID_DISCOVERY_MAX];
 270         int altmodes;           /* number of alternate modes    */
 271         struct typec_altmode_desc altmode_desc[ALTMODE_DISCOVERY_MAX];
 272 };
 273
 274 /*
 275  * @min_volt: Actual min voltage at the local port
 276  * @req_min_volt: Requested min voltage to the port partner
 277  * @max_volt: Actual max voltage at the local port
 278  * @req_max_volt: Requested max voltage to the port partner
 279  * @max_curr: Actual max current at the local port
 280  * @req_max_curr: Requested max current of the port partner
 281  * @req_out_volt: Requested output voltage to the port partner
 282  * @req_op_curr: Requested operating current to the port partner
 283  * @supported: Parter has at least one APDO hence supports PPS
 284  * @active: PPS mode is active
 285  */
 286 struct pd_pps_data {
 287         u32 min_volt;
 288         u32 req_min_volt;
 289         u32 max_volt;
 290         u32 req_max_volt;
 291         u32 max_curr;
 292         u32 req_max_curr;
 293         u32 req_out_volt;
 294         u32 req_op_curr;
 295         bool supported;
 296         bool active;
 297 };
 298
 299 struct tcpm_port {
 300         struct device *dev;
 301
 302         struct mutex lock;              /* tcpm state machine lock */
 303         struct kthread_worker *wq;
 304
 305         struct typec_capability typec_caps;
 306         struct typec_port *typec_port;
 307
 308         struct tcpc_dev *tcpc;
 309         struct usb_role_switch *role_sw;
 310
 311         enum typec_role vconn_role;
 312         enum typec_role pwr_role;
 313         enum typec_data_role data_role;
 314         enum typec_pwr_opmode pwr_opmode;
 315
 316         struct usb_pd_identity partner_ident;
 317         struct typec_partner_desc partner_desc;
 318         struct typec_partner *partner;
 319
 320         enum typec_cc_status cc_req;
 321         enum typec_cc_status src_rp;    /* work only if pd_supported == false */
 322
 323         enum typec_cc_status cc1;
 324         enum typec_cc_status cc2;
 325         enum typec_cc_polarity polarity;
 326
 327         bool attached;
 328         bool connected;
 329         bool registered;
 330         bool pd_supported;
 331         enum typec_port_type port_type;
 332
 333         /*
 334          * Set to true when vbus is greater than VSAFE5V min.
 335          * Set to false when vbus falls below vSinkDisconnect max threshold.
 336          */
 337         bool vbus_present;
 338
 339         /*
 340          * Set to true when vbus is less than VSAFE0V max.
 341          * Set to false when vbus is greater than VSAFE0V max.
 342          */
 343         bool vbus_vsafe0v;
 344
 345         bool vbus_never_low;
 346         bool vbus_source;
 347         bool vbus_charge;
 348
 349         /* Set to true when Discover_Identity Command is expected to be sent in Ready states. */
 350         bool send_discover;
 351         bool op_vsafe5v;
 352
 353         int try_role;
 354         int try_snk_count;
 355         int try_src_count;
 356
 357         enum pd_msg_request queued_message;
 358
 359         enum tcpm_state enter_state;
 360         enum tcpm_state prev_state;
 361         enum tcpm_state state;
 362         enum tcpm_state delayed_state;
 363         ktime_t delayed_runtime;
 364         unsigned long delay_ms;
 365
 366         spinlock_t pd_event_lock;
 367         u32 pd_events;
 368
 369         struct kthread_work event_work;
 370         struct hrtimer state_machine_timer;
 371         struct kthread_work state_machine;
 372         struct hrtimer vdm_state_machine_timer;
 373         struct kthread_work vdm_state_machine;
 374         struct hrtimer enable_frs_timer;
 375         struct kthread_work enable_frs;
 376         struct hrtimer send_discover_timer;
 377         struct kthread_work send_discover_work;
 378         bool state_machine_running;
 379         /* Set to true when VDM State Machine has following actions. */
 380         bool vdm_sm_running;
 381
 382         struct completion tx_complete;
 383         enum tcpm_transmit_status tx_status;
 384
 385         struct mutex swap_lock;         /* swap command lock */
 386         bool swap_pending;
 387         bool non_pd_role_swap;
 388         struct completion swap_complete;
 389         int swap_status;
 390
 391         unsigned int negotiated_rev;
 392         unsigned int message_id;
 393         unsigned int caps_count;
 394         unsigned int hard_reset_count;
 395         bool pd_capable;
 396         bool explicit_contract;
 397         unsigned int rx_msgid;
 398
 399         /* USB PD objects */
 400         struct usb_power_delivery *pd;
 401         struct usb_power_delivery_capabilities *port_source_caps;
 402         struct usb_power_delivery_capabilities *port_sink_caps;
 403         struct usb_power_delivery *partner_pd;
 404         struct usb_power_delivery_capabilities *partner_source_caps;
 405         struct usb_power_delivery_capabilities *partner_sink_caps;
 406
 407         /* Partner capabilities/requests */
 408         u32 sink_request;
 409         u32 source_caps[PDO_MAX_OBJECTS];
 410         unsigned int nr_source_caps;
 411         u32 sink_caps[PDO_MAX_OBJECTS];
 412         unsigned int nr_sink_caps;
 413
 414         /* Local capabilities */
 415         u32 src_pdo[PDO_MAX_OBJECTS];
 416         unsigned int nr_src_pdo;
 417         u32 snk_pdo[PDO_MAX_OBJECTS];
 418         unsigned int nr_snk_pdo;
 419         u32 snk_vdo_v1[VDO_MAX_OBJECTS];
 420         unsigned int nr_snk_vdo_v1;
 421         u32 snk_vdo[VDO_MAX_OBJECTS];
 422         unsigned int nr_snk_vdo;
 423
 424         unsigned int operating_snk_mw;
 425         bool update_sink_caps;
 426
 427         /* Requested current / voltage to the port partner */
 428         u32 req_current_limit;
 429         u32 req_supply_voltage;
 430         /* Actual current / voltage limit of the local port */
 431         u32 current_limit;
 432         u32 supply_voltage;
 433
 434         /* Used to export TA voltage and current */
 435         struct power_supply *psy;
 436         struct power_supply_desc psy_desc;
 437         enum power_supply_usb_type usb_type;
 438
 439         u32 bist_request;
 440
 441         /* PD state for Vendor Defined Messages */
 442         enum vdm_states vdm_state;
 443         u32 vdm_retries;
 444         /* next Vendor Defined Message to send */
 445         u32 vdo_data[VDO_MAX_SIZE];
 446         u8 vdo_count;
 447         /* VDO to retry if UFP responder replied busy */
 448         u32 vdo_retry;
 449
 450         /* PPS */
 451         struct pd_pps_data pps_data;
 452         struct completion pps_complete;
 453         bool pps_pending;
 454         int pps_status;
 455
 456         /* Alternate mode data */
 457         struct pd_mode_data mode_data;
 458         struct typec_altmode *partner_altmode[ALTMODE_DISCOVERY_MAX];
 459         struct typec_altmode *port_altmode[ALTMODE_DISCOVERY_MAX];
 460
 461         /* Deadline in jiffies to exit src_try_wait state */
 462         unsigned long max_wait;
 463
 464         /* port belongs to a self powered device */
 465         bool self_powered;
 466
 467         /* Sink FRS */
 468         enum frs_typec_current new_source_frs_current;
 469
 470         /* Sink caps have been queried */
 471         bool sink_cap_done;
 472
 473         /* Collision Avoidance and Atomic Message Sequence */
 474         enum tcpm_state upcoming_state;
 475         enum tcpm_ams ams;
 476         enum tcpm_ams next_ams;
 477         bool in_ams;
 478
 479         /* Auto vbus discharge status */
 480         bool auto_vbus_discharge_enabled;
 481
 482         /*
 483          * When set, port requests PD_P_SNK_STDBY_MW upon entering SNK_DISCOVERY and
 484          * the actual current limit after RX of PD_CTRL_PSRDY for PD link,
 485          * SNK_READY for non-pd link.
 486          */
 487         bool slow_charger_loop;
 488
 489         /*
 490          * When true indicates that the lower level drivers indicate potential presence
 491          * of contaminant in the connector pins based on the tcpm state machine
 492          * transitions.
 493          */
 494         bool potential_contaminant;
 495 #ifdef CONFIG_DEBUG_FS
 496         struct dentry *dentry;
 497         struct mutex logbuffer_lock;    /* log buffer access lock */
 498         int logbuffer_head;
 499         int logbuffer_tail;
 500         u8 *logbuffer[LOG_BUFFER_ENTRIES];
 501 #endif
 502 };
 503
 504 struct pd_rx_event {
 505         struct kthread_work work;
 506         struct tcpm_port *port;
 507         struct pd_message msg;
 508 };
 509
 510 static const char * const pd_rev[] = {
 511         [PD_REV10]              = "rev1",
 512         [PD_REV20]              = "rev2",
 513         [PD_REV30]              = "rev3",
 514 };
 515
 516 #define tcpm_cc_is_sink(cc) \
 517         ((cc) == TYPEC_CC_RP_DEF || (cc) == TYPEC_CC_RP_1_5 || \
 518          (cc) == TYPEC_CC_RP_3_0)
 519
 520 #define tcpm_port_is_sink(port) \
 521         ((tcpm_cc_is_sink((port)->cc1) && !tcpm_cc_is_sink((port)->cc2)) || \
 522          (tcpm_cc_is_sink((port)->cc2) && !tcpm_cc_is_sink((port)->cc1)))
 523
 524 #define tcpm_cc_is_source(cc) ((cc) == TYPEC_CC_RD)
 525 #define tcpm_cc_is_audio(cc) ((cc) == TYPEC_CC_RA)
 526 #define tcpm_cc_is_open(cc) ((cc) == TYPEC_CC_OPEN)
 527
 528 #define tcpm_port_is_source(port) \
 529         ((tcpm_cc_is_source((port)->cc1) && \
 530          !tcpm_cc_is_source((port)->cc2)) || \
 531          (tcpm_cc_is_source((port)->cc2) && \
 532           !tcpm_cc_is_source((port)->cc1)))
 533
 534 #define tcpm_port_is_debug(port) \
 535         (tcpm_cc_is_source((port)->cc1) && tcpm_cc_is_source((port)->cc2))
 536
 537 #define tcpm_port_is_audio(port) \
 538         (tcpm_cc_is_audio((port)->cc1) && tcpm_cc_is_audio((port)->cc2))
 539
 540 #define tcpm_port_is_audio_detached(port) \
 541         ((tcpm_cc_is_audio((port)->cc1) && tcpm_cc_is_open((port)->cc2)) || \
 542          (tcpm_cc_is_audio((port)->cc2) && tcpm_cc_is_open((port)->cc1)))
 543
 544 #define tcpm_try_snk(port) \
 545         ((port)->try_snk_count == 0 && (port)->try_role == TYPEC_SINK && \
 546         (port)->port_type == TYPEC_PORT_DRP)
 547
 548 #define tcpm_try_src(port) \
 549         ((port)->try_src_count == 0 && (port)->try_role == TYPEC_SOURCE && \
 550         (port)->port_type == TYPEC_PORT_DRP)
 551
 552 #define tcpm_data_role_for_source(port) \
 553         ((port)->typec_caps.data == TYPEC_PORT_UFP ? \
 554         TYPEC_DEVICE : TYPEC_HOST)
 555
 556 #define tcpm_data_role_for_sink(port) \
 557         ((port)->typec_caps.data == TYPEC_PORT_DFP ? \
 558         TYPEC_HOST : TYPEC_DEVICE)
 559
 560 #define tcpm_sink_tx_ok(port) \
 561         (tcpm_port_is_sink(port) && \
 562         ((port)->cc1 == TYPEC_CC_RP_3_0 || (port)->cc2 == TYPEC_CC_RP_3_0))
 563
 564 #define tcpm_wait_for_discharge(port) \
 565         (((port)->auto_vbus_discharge_enabled && !(port)->vbus_vsafe0v) ? PD_T_SAFE_0V : 0)
 566
 567 static enum tcpm_state tcpm_default_state(struct tcpm_port *port)
 568 {
 569         if (port->port_type == TYPEC_PORT_DRP) {
 570                 if (port->try_role == TYPEC_SINK)
 571                         return SNK_UNATTACHED;
 572                 else if (port->try_role == TYPEC_SOURCE)
 573                         return SRC_UNATTACHED;
 574                 /* Fall through to return SRC_UNATTACHED */
 575         } else if (port->port_type == TYPEC_PORT_SNK) {
 576                 return SNK_UNATTACHED;
 577         }
 578         return SRC_UNATTACHED;
 579 }
 580
 581 static bool tcpm_port_is_disconnected(struct tcpm_port *port)
 582 {
 583         return (!port->attached && port->cc1 == TYPEC_CC_OPEN &&
 584                 port->cc2 == TYPEC_CC_OPEN) ||
 585                (port->attached && ((port->polarity == TYPEC_POLARITY_CC1 &&
 586                                     port->cc1 == TYPEC_CC_OPEN) ||
 587                                    (port->polarity == TYPEC_POLARITY_CC2 &&
 588                                     port->cc2 == TYPEC_CC_OPEN)));
 589 }
 590
 591 /*
 592  * Logging
 593  */
 594
 595 #ifdef CONFIG_DEBUG_FS
 596
 597 static bool tcpm_log_full(struct tcpm_port *port)
 598 {
 599         return port->logbuffer_tail ==
 600                 (port->logbuffer_head + 1) % LOG_BUFFER_ENTRIES;
 601 }
 602
 603 __printf(2, 0)
 604 static void _tcpm_log(struct tcpm_port *port, const char *fmt, va_list args)
 605 {
 606         char tmpbuffer[LOG_BUFFER_ENTRY_SIZE];
 607         u64 ts_nsec = local_clock();
 608         unsigned long rem_nsec;
 609
 610         mutex_lock(&port->logbuffer_lock);
 611         if (!port->logbuffer[port->logbuffer_head]) {
 612                 port->logbuffer[port->logbuffer_head] =
 613                                 kzalloc(LOG_BUFFER_ENTRY_SIZE, GFP_KERNEL);
 614                 if (!port->logbuffer[port->logbuffer_head]) {
 615                         mutex_unlock(&port->logbuffer_lock);
 616                         return;
 617                 }
 618         }
 619
 620         vsnprintf(tmpbuffer, sizeof(tmpbuffer), fmt, args);
 621
 622         if (tcpm_log_full(port)) {
 623                 port->logbuffer_head = max(port->logbuffer_head - 1, 0);
 624                 strcpy(tmpbuffer, "overflow");
 625         }
 626
 627         if (port->logbuffer_head < 0 ||
 628             port->logbuffer_head >= LOG_BUFFER_ENTRIES) {
 629                 dev_warn(port->dev,
 630                          "Bad log buffer index %d\n", port->logbuffer_head);
 631                 goto abort;
 632         }
 633
 634         if (!port->logbuffer[port->logbuffer_head]) {
 635                 dev_warn(port->dev,
 636                          "Log buffer index %d is NULL\n", port->logbuffer_head);
 637                 goto abort;
 638         }
 639
 640         rem_nsec = do_div(ts_nsec, 1000000000);
 641         scnprintf(port->logbuffer[port->logbuffer_head],
 642                   LOG_BUFFER_ENTRY_SIZE, "[%5lu.%06lu] %s",
 643                   (unsigned long)ts_nsec, rem_nsec / 1000,
 644                   tmpbuffer);
 645         port->logbuffer_head = (port->logbuffer_head + 1) % LOG_BUFFER_ENTRIES;
 646
 647 abort:
 648         mutex_unlock(&port->logbuffer_lock);
 649 }
 650
 651 __printf(2, 3)
 652 static void tcpm_log(struct tcpm_port *port, const char *fmt, ...)
 653 {
 654         va_list args;
 655
 656         /* Do not log while disconnected and unattached */
 657         if (tcpm_port_is_disconnected(port) &&
 658             (port->state == SRC_UNATTACHED || port->state == SNK_UNATTACHED ||
 659              port->state == TOGGLING || port->state == CHECK_CONTAMINANT))
 660                 return;
 661
 662         va_start(args, fmt);
 663         _tcpm_log(port, fmt, args);
 664         va_end(args);
 665 }
 666
 667 __printf(2, 3)
 668 static void tcpm_log_force(struct tcpm_port *port, const char *fmt, ...)
 669 {
 670         va_list args;
 671
 672         va_start(args, fmt);
 673         _tcpm_log(port, fmt, args);
 674         va_end(args);
 675 }
 676
 677 static void tcpm_log_source_caps(struct tcpm_port *port)
 678 {
 679         int i;
 680
 681         for (i = 0; i < port->nr_source_caps; i++) {
 682                 u32 pdo = port->source_caps[i];
 683                 enum pd_pdo_type type = pdo_type(pdo);
 684                 char msg[64];
 685
 686                 switch (type) {
 687                 case PDO_TYPE_FIXED:
 688                         scnprintf(msg, sizeof(msg),
 689                                   "%u mV, %u mA [%s%s%s%s%s%s]",
 690                                   pdo_fixed_voltage(pdo),
 691                                   pdo_max_current(pdo),
 692                                   (pdo & PDO_FIXED_DUAL_ROLE) ?
 693                                                         "R" : "",
 694                                   (pdo & PDO_FIXED_SUSPEND) ?
 695                                                         "S" : "",
 696                                   (pdo & PDO_FIXED_HIGHER_CAP) ?
 697                                                         "H" : "",
 698                                   (pdo & PDO_FIXED_USB_COMM) ?
 699                                                         "U" : "",
 700                                   (pdo & PDO_FIXED_DATA_SWAP) ?
 701                                                         "D" : "",
 702                                   (pdo & PDO_FIXED_EXTPOWER) ?
 703                                                         "E" : "");
 704                         break;
 705                 case PDO_TYPE_VAR:
 706                         scnprintf(msg, sizeof(msg),
 707                                   "%u-%u mV, %u mA",
 708                                   pdo_min_voltage(pdo),
 709                                   pdo_max_voltage(pdo),
 710                                   pdo_max_current(pdo));
 711                         break;
 712                 case PDO_TYPE_BATT:
 713                         scnprintf(msg, sizeof(msg),
 714                                   "%u-%u mV, %u mW",
 715                                   pdo_min_voltage(pdo),
 716                                   pdo_max_voltage(pdo),
 717                                   pdo_max_power(pdo));
 718                         break;
 719                 case PDO_TYPE_APDO:
 720                         if (pdo_apdo_type(pdo) == APDO_TYPE_PPS)
 721                                 scnprintf(msg, sizeof(msg),
 722                                           "%u-%u mV, %u mA",
 723                                           pdo_pps_apdo_min_voltage(pdo),
 724                                           pdo_pps_apdo_max_voltage(pdo),
 725                                           pdo_pps_apdo_max_current(pdo));
 726                         else
 727                                 strcpy(msg, "undefined APDO");
 728                         break;
 729                 default:
 730                         strcpy(msg, "undefined");
 731                         break;
 732                 }
 733                 tcpm_log(port, " PDO %d: type %d, %s",
 734                          i, type, msg);
 735         }
 736 }
 737
 738 static int tcpm_debug_show(struct seq_file *s, void *v)
 739 {
 740         struct tcpm_port *port = s->private;
 741         int tail;
 742
 743         mutex_lock(&port->logbuffer_lock);
 744         tail = port->logbuffer_tail;
 745         while (tail != port->logbuffer_head) {
 746                 seq_printf(s, "%s\n", port->logbuffer[tail]);
 747                 tail = (tail + 1) % LOG_BUFFER_ENTRIES;
 748         }
 749         if (!seq_has_overflowed(s))
 750                 port->logbuffer_tail = tail;
 751         mutex_unlock(&port->logbuffer_lock);
 752
 753         return 0;
 754 }
 755 DEFINE_SHOW_ATTRIBUTE(tcpm_debug);
 756
 757 static void tcpm_debugfs_init(struct tcpm_port *port)
 758 {
 759         char name[NAME_MAX];
 760
 761         mutex_init(&port->logbuffer_lock);
 762         snprintf(name, NAME_MAX, "tcpm-%s", dev_name(port->dev));
 763         port->dentry = debugfs_create_dir(name, usb_debug_root);
 764         debugfs_create_file("log", S_IFREG | 0444, port->dentry, port,
 765                             &tcpm_debug_fops);
 766 }
 767
 768 static void tcpm_debugfs_exit(struct tcpm_port *port)
 769 {
 770         int i;
 771
 772         mutex_lock(&port->logbuffer_lock);
 773         for (i = 0; i < LOG_BUFFER_ENTRIES; i++) {
 774                 kfree(port->logbuffer[i]);
 775                 port->logbuffer[i] = NULL;
 776         }
 777         mutex_unlock(&port->logbuffer_lock);
 778
 779         debugfs_remove(port->dentry);
 780 }
 781
 782 #else
 783
 784 __printf(2, 3)
 785 static void tcpm_log(const struct tcpm_port *port, const char *fmt, ...) { }
 786 __printf(2, 3)
 787 static void tcpm_log_force(struct tcpm_port *port, const char *fmt, ...) { }
 788 static void tcpm_log_source_caps(struct tcpm_port *port) { }
 789 static void tcpm_debugfs_init(const struct tcpm_port *port) { }
 790 static void tcpm_debugfs_exit(const struct tcpm_port *port) { }
 791
 792 #endif
 793
 794 static void tcpm_set_cc(struct tcpm_port *port, enum typec_cc_status cc)
 795 {
 796         tcpm_log(port, "cc:=%d", cc);
 797         port->cc_req = cc;
 798         port->tcpc->set_cc(port->tcpc, cc);
 799 }
 800
 801 static int tcpm_enable_auto_vbus_discharge(struct tcpm_port *port, bool enable)
 802 {
 803         int ret = 0;
 804
 805         if (port->tcpc->enable_auto_vbus_discharge) {
 806                 ret = port->tcpc->enable_auto_vbus_discharge(port->tcpc, enable);
 807                 tcpm_log_force(port, "%s vbus discharge ret:%d", enable ? "enable" : "disable",
 808                                ret);
 809                 if (!ret)
 810                         port->auto_vbus_discharge_enabled = enable;
 811         }
 812
 813         return ret;
 814 }
 815
 816 static void tcpm_apply_rc(struct tcpm_port *port)
 817 {
 818         /*
 819          * TCPCI: Move to APPLY_RC state to prevent disconnect during PR_SWAP
 820          * when Vbus auto discharge on disconnect is enabled.
 821          */
 822         if (port->tcpc->enable_auto_vbus_discharge && port->tcpc->apply_rc) {
 823                 tcpm_log(port, "Apply_RC");
 824                 port->tcpc->apply_rc(port->tcpc, port->cc_req, port->polarity);
 825                 tcpm_enable_auto_vbus_discharge(port, false);
 826         }
 827 }
 828
 829 /*
 830  * Determine RP value to set based on maximum current supported
 831  * by a port if configured as source.
 832  * Returns CC value to report to link partner.
 833  */
 834 static enum typec_cc_status tcpm_rp_cc(struct tcpm_port *port)
 835 {
 836         const u32 *src_pdo = port->src_pdo;
 837         int nr_pdo = port->nr_src_pdo;
 838         int i;
 839
 840         if (!port->pd_supported)
 841                 return port->src_rp;
 842
 843         /*
 844          * Search for first entry with matching voltage.
 845          * It should report the maximum supported current.
 846          */
 847         for (i = 0; i < nr_pdo; i++) {
 848                 const u32 pdo = src_pdo[i];
 849
 850                 if (pdo_type(pdo) == PDO_TYPE_FIXED &&
 851                     pdo_fixed_voltage(pdo) == 5000) {
 852                         unsigned int curr = pdo_max_current(pdo);
 853
 854                         if (curr >= 3000)
 855                                 return TYPEC_CC_RP_3_0;
 856                         else if (curr >= 1500)
 857                                 return TYPEC_CC_RP_1_5;
 858                         return TYPEC_CC_RP_DEF;
 859                 }
 860         }
 861
 862         return TYPEC_CC_RP_DEF;
 863 }
 864
 865 static void tcpm_ams_finish(struct tcpm_port *port)
 866 {
 867         tcpm_log(port, "AMS %s finished", tcpm_ams_str[port->ams]);
 868
 869         if (port->pd_capable && port->pwr_role == TYPEC_SOURCE) {
 870                 if (port->negotiated_rev >= PD_REV30)
 871                         tcpm_set_cc(port, SINK_TX_OK);
 872                 else
 873                         tcpm_set_cc(port, SINK_TX_NG);
 874         } else if (port->pwr_role == TYPEC_SOURCE) {
 875                 tcpm_set_cc(port, tcpm_rp_cc(port));
 876         }
 877
 878         port->in_ams = false;
 879         port->ams = NONE_AMS;
 880 }
 881
 882 static int tcpm_pd_transmit(struct tcpm_port *port,
 883                             enum tcpm_transmit_type type,
 884                             const struct pd_message *msg)
 885 {
 886         unsigned long timeout;
 887         int ret;
 888
 889         if (msg)
 890                 tcpm_log(port, "PD TX, header: %#x", le16_to_cpu(msg->header));
 891         else
 892                 tcpm_log(port, "PD TX, type: %#x", type);
 893
 894         reinit_completion(&port->tx_complete);
 895         ret = port->tcpc->pd_transmit(port->tcpc, type, msg, port->negotiated_rev);
 896         if (ret < 0)
 897                 return ret;
 898
 899         mutex_unlock(&port->lock);
 900         timeout = wait_for_completion_timeout(&port->tx_complete,
 901                                 msecs_to_jiffies(PD_T_TCPC_TX_TIMEOUT));
 902         mutex_lock(&port->lock);
 903         if (!timeout)
 904                 return -ETIMEDOUT;
 905
 906         switch (port->tx_status) {
 907         case TCPC_TX_SUCCESS:
 908                 port->message_id = (port->message_id + 1) & PD_HEADER_ID_MASK;
 909                 /*
 910                  * USB PD rev 2.0, 8.3.2.2.1:
 911                  * USB PD rev 3.0, 8.3.2.1.3:
 912                  * "... Note that every AMS is Interruptible until the first
 913                  * Message in the sequence has been successfully sent (GoodCRC
 914                  * Message received)."
 915                  */
 916                 if (port->ams != NONE_AMS)
 917                         port->in_ams = true;
 918                 break;
 919         case TCPC_TX_DISCARDED:
 920                 ret = -EAGAIN;
 921                 break;
 922         case TCPC_TX_FAILED:
 923         default:
 924                 ret = -EIO;
 925                 break;
 926         }
 927
 928         /* Some AMS don't expect responses. Finish them here. */
 929         if (port->ams == ATTENTION || port->ams == SOURCE_ALERT)
 930                 tcpm_ams_finish(port);
 931
 932         return ret;
 933 }
 934
 935 void tcpm_pd_transmit_complete(struct tcpm_port *port,
 936                                enum tcpm_transmit_status status)
 937 {
 938         tcpm_log(port, "PD TX complete, status: %u", status);
 939         port->tx_status = status;
 940         complete(&port->tx_complete);
 941 }
 942 EXPORT_SYMBOL_GPL(tcpm_pd_transmit_complete);
 943
 944 static int tcpm_mux_set(struct tcpm_port *port, int state,
 945                         enum usb_role usb_role,
 946                         enum typec_orientation orientation)
 947 {
 948         int ret;
 949
 950         tcpm_log(port, "Requesting mux state %d, usb-role %d, orientation %d",
 951                  state, usb_role, orientation);
 952
 953         ret = typec_set_orientation(port->typec_port, orientation);
 954         if (ret)
 955                 return ret;
 956
 957         if (port->role_sw) {
 958                 ret = usb_role_switch_set_role(port->role_sw, usb_role);
 959                 if (ret)
 960                         return ret;
 961         }
 962
 963         return typec_set_mode(port->typec_port, state);
 964 }
 965
 966 static int tcpm_set_polarity(struct tcpm_port *port,
 967                              enum typec_cc_polarity polarity)
 968 {
 969         int ret;
 970
 971         tcpm_log(port, "polarity %d", polarity);
 972
 973         ret = port->tcpc->set_polarity(port->tcpc, polarity);
 974         if (ret < 0)
 975                 return ret;
 976
 977         port->polarity = polarity;
 978
 979         return 0;
 980 }
 981
 982 static int tcpm_set_vconn(struct tcpm_port *port, bool enable)
 983 {
 984         int ret;
 985
 986         tcpm_log(port, "vconn:=%d", enable);
 987
 988         ret = port->tcpc->set_vconn(port->tcpc, enable);
 989         if (!ret) {
 990                 port->vconn_role = enable ? TYPEC_SOURCE : TYPEC_SINK;
 991                 typec_set_vconn_role(port->typec_port, port->vconn_role);
 992         }
 993
 994         return ret;
 995 }
 996
 997 static u32 tcpm_get_current_limit(struct tcpm_port *port)
 998 {
 999         enum typec_cc_status cc;
1000         u32 limit;
1001
1002         cc = port->polarity ? port->cc2 : port->cc1;
1003         switch (cc) {
1004         case TYPEC_CC_RP_1_5:
1005                 limit = 1500;
1006                 break;
1007         case TYPEC_CC_RP_3_0:
1008                 limit = 3000;
1009                 break;
1010         case TYPEC_CC_RP_DEF:
1011         default:
1012                 if (port->tcpc->get_current_limit)
1013                         limit = port->tcpc->get_current_limit(port->tcpc);
1014                 else
1015                         limit = 0;
1016                 break;
1017         }
1018
1019         return limit;
1020 }
1021
1022 static int tcpm_set_current_limit(struct tcpm_port *port, u32 max_ma, u32 mv)
1023 {
1024         int ret = -EOPNOTSUPP;
1025
1026         tcpm_log(port, "Setting voltage/current limit %u mV %u mA", mv, max_ma);
1027
1028         port->supply_voltage = mv;
1029         port->current_limit = max_ma;
1030         power_supply_changed(port->psy);
1031
1032         if (port->tcpc->set_current_limit)
1033                 ret = port->tcpc->set_current_limit(port->tcpc, max_ma, mv);
1034
1035         return ret;
1036 }
1037
1038 static int tcpm_set_attached_state(struct tcpm_port *port, bool attached)
1039 {
1040         return port->tcpc->set_roles(port->tcpc, attached, port->pwr_role,
1041                                      port->data_role);
1042 }
1043
1044 static int tcpm_set_roles(struct tcpm_port *port, bool attached,
1045                           enum typec_role role, enum typec_data_role data)
1046 {
1047         enum typec_orientation orientation;
1048         enum usb_role usb_role;
1049         int ret;
1050
1051         if (port->polarity == TYPEC_POLARITY_CC1)
1052                 orientation = TYPEC_ORIENTATION_NORMAL;
1053         else
1054                 orientation = TYPEC_ORIENTATION_REVERSE;
1055
1056         if (port->typec_caps.data == TYPEC_PORT_DRD) {
1057                 if (data == TYPEC_HOST)
1058                         usb_role = USB_ROLE_HOST;
1059                 else
1060                         usb_role = USB_ROLE_DEVICE;
1061         } else if (port->typec_caps.data == TYPEC_PORT_DFP) {
1062                 if (data == TYPEC_HOST) {
1063                         if (role == TYPEC_SOURCE)
1064                                 usb_role = USB_ROLE_HOST;
1065                         else
1066                                 usb_role = USB_ROLE_NONE;
1067                 } else {
1068                         return -ENOTSUPP;
1069                 }
1070         } else {
1071                 if (data == TYPEC_DEVICE) {
1072                         if (role == TYPEC_SINK)
1073                                 usb_role = USB_ROLE_DEVICE;
1074                         else
1075                                 usb_role = USB_ROLE_NONE;
1076                 } else {
1077                         return -ENOTSUPP;
1078                 }
1079         }
1080
1081         ret = tcpm_mux_set(port, TYPEC_STATE_USB, usb_role, orientation);
1082         if (ret < 0)
1083                 return ret;
1084
1085         ret = port->tcpc->set_roles(port->tcpc, attached, role, data);
1086         if (ret < 0)
1087                 return ret;
1088
1089         port->pwr_role = role;
1090         port->data_role = data;
1091         typec_set_data_role(port->typec_port, data);
1092         typec_set_pwr_role(port->typec_port, role);
1093
1094         return 0;
1095 }
1096
1097 static int tcpm_set_pwr_role(struct tcpm_port *port, enum typec_role role)
1098 {
1099         int ret;
1100
1101         ret = port->tcpc->set_roles(port->tcpc, true, role,
1102                                     port->data_role);
1103         if (ret < 0)
1104                 return ret;
1105
1106         port->pwr_role = role;
1107         typec_set_pwr_role(port->typec_port, role);
1108
1109         return 0;
1110 }
1111
1112 /*
1113  * Transform the PDO to be compliant to PD rev2.0.
1114  * Return 0 if the PDO type is not defined in PD rev2.0.
1115  * Otherwise, return the converted PDO.
1116  */
1117 static u32 tcpm_forge_legacy_pdo(struct tcpm_port *port, u32 pdo, enum typec_role role)
1118 {
1119         switch (pdo_type(pdo)) {
1120         case PDO_TYPE_FIXED:
1121                 if (role == TYPEC_SINK)
1122                         return pdo & ~PDO_FIXED_FRS_CURR_MASK;
1123                 else
1124                         return pdo & ~PDO_FIXED_UNCHUNK_EXT;
1125         case PDO_TYPE_VAR:
1126         case PDO_TYPE_BATT:
1127                 return pdo;
1128         case PDO_TYPE_APDO:
1129         default:
1130                 return 0;
1131         }
1132 }
1133
1134 static int tcpm_pd_send_source_caps(struct tcpm_port *port)
1135 {
1136         struct pd_message msg;
1137         u32 pdo;
1138         unsigned int i, nr_pdo = 0;
1139
1140         memset(&msg, 0, sizeof(msg));
1141
1142         for (i = 0; i < port->nr_src_pdo; i++) {
1143                 if (port->negotiated_rev >= PD_REV30) {
1144                         msg.payload[nr_pdo++] = cpu_to_le32(port->src_pdo[i]);
1145                 } else {
1146                         pdo = tcpm_forge_legacy_pdo(port, port->src_pdo[i], TYPEC_SOURCE);
1147                         if (pdo)
1148                                 msg.payload[nr_pdo++] = cpu_to_le32(pdo);
1149                 }
1150         }
1151
1152         if (!nr_pdo) {
1153                 /* No source capabilities defined, sink only */
1154                 msg.header = PD_HEADER_LE(PD_CTRL_REJECT,
1155                                           port->pwr_role,
1156                                           port->data_role,
1157                                           port->negotiated_rev,
1158                                           port->message_id, 0);
1159         } else {
1160                 msg.header = PD_HEADER_LE(PD_DATA_SOURCE_CAP,
1161                                           port->pwr_role,
1162                                           port->data_role,
1163                                           port->negotiated_rev,
1164                                           port->message_id,
1165                                           nr_pdo);
1166         }
1167
1168         return tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
1169 }
1170
1171 static int tcpm_pd_send_sink_caps(struct tcpm_port *port)
1172 {
1173         struct pd_message msg;
1174         u32 pdo;
1175         unsigned int i, nr_pdo = 0;
1176
1177         memset(&msg, 0, sizeof(msg));
1178
1179         for (i = 0; i < port->nr_snk_pdo; i++) {
1180                 if (port->negotiated_rev >= PD_REV30) {
1181                         msg.payload[nr_pdo++] = cpu_to_le32(port->snk_pdo[i]);
1182                 } else {
1183                         pdo = tcpm_forge_legacy_pdo(port, port->snk_pdo[i], TYPEC_SINK);
1184                         if (pdo)
1185                                 msg.payload[nr_pdo++] = cpu_to_le32(pdo);
1186                 }
1187         }
1188
1189         if (!nr_pdo) {
1190                 /* No sink capabilities defined, source only */
1191                 msg.header = PD_HEADER_LE(PD_CTRL_REJECT,
1192                                           port->pwr_role,
1193                                           port->data_role,
1194                                           port->negotiated_rev,
1195                                           port->message_id, 0);
1196         } else {
1197                 msg.header = PD_HEADER_LE(PD_DATA_SINK_CAP,
1198                                           port->pwr_role,
1199                                           port->data_role,
1200                                           port->negotiated_rev,
1201                                           port->message_id,
1202                                           nr_pdo);
1203         }
1204
1205         return tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
1206 }
1207
1208 static void mod_tcpm_delayed_work(struct tcpm_port *port, unsigned int delay_ms)
1209 {
1210         if (delay_ms) {
1211                 hrtimer_start(&port->state_machine_timer, ms_to_ktime(delay_ms), HRTIMER_MODE_REL);
1212         } else {
1213                 hrtimer_cancel(&port->state_machine_timer);
1214                 kthread_queue_work(port->wq, &port->state_machine);
1215         }
1216 }
1217
1218 static void mod_vdm_delayed_work(struct tcpm_port *port, unsigned int delay_ms)
1219 {
1220         if (delay_ms) {
1221                 hrtimer_start(&port->vdm_state_machine_timer, ms_to_ktime(delay_ms),
1222                               HRTIMER_MODE_REL);
1223         } else {
1224                 hrtimer_cancel(&port->vdm_state_machine_timer);
1225                 kthread_queue_work(port->wq, &port->vdm_state_machine);
1226         }
1227 }
1228
1229 static void mod_enable_frs_delayed_work(struct tcpm_port *port, unsigned int delay_ms)
1230 {
1231         if (delay_ms) {
1232                 hrtimer_start(&port->enable_frs_timer, ms_to_ktime(delay_ms), HRTIMER_MODE_REL);
1233         } else {
1234                 hrtimer_cancel(&port->enable_frs_timer);
1235                 kthread_queue_work(port->wq, &port->enable_frs);
1236         }
1237 }
1238
1239 static void mod_send_discover_delayed_work(struct tcpm_port *port, unsigned int delay_ms)
1240 {
1241         if (delay_ms) {
1242                 hrtimer_start(&port->send_discover_timer, ms_to_ktime(delay_ms), HRTIMER_MODE_REL);
1243         } else {
1244                 hrtimer_cancel(&port->send_discover_timer);
1245                 kthread_queue_work(port->wq, &port->send_discover_work);
1246         }
1247 }
1248
1249 static void tcpm_set_state(struct tcpm_port *port, enum tcpm_state state,
1250                            unsigned int delay_ms)
1251 {
1252         if (delay_ms) {
1253                 tcpm_log(port, "pending state change %s -> %s @ %u ms [%s %s]",
1254                          tcpm_states[port->state], tcpm_states[state], delay_ms,
1255                          pd_rev[port->negotiated_rev], tcpm_ams_str[port->ams]);
1256                 port->delayed_state = state;
1257                 mod_tcpm_delayed_work(port, delay_ms);
1258                 port->delayed_runtime = ktime_add(ktime_get(), ms_to_ktime(delay_ms));
1259                 port->delay_ms = delay_ms;
1260         } else {
1261                 tcpm_log(port, "state change %s -> %s [%s %s]",
1262                          tcpm_states[port->state], tcpm_states[state],
1263                          pd_rev[port->negotiated_rev], tcpm_ams_str[port->ams]);
1264                 port->delayed_state = INVALID_STATE;
1265                 port->prev_state = port->state;
1266                 port->state = state;
1267                 /*
1268                  * Don't re-queue the state machine work item if we're currently
1269                  * in the state machine and we're immediately changing states.
1270                  * tcpm_state_machine_work() will continue running the state
1271                  * machine.
1272                  */
1273                 if (!port->state_machine_running)
1274                         mod_tcpm_delayed_work(port, 0);
1275         }
1276 }
1277
1278 static void tcpm_set_state_cond(struct tcpm_port *port, enum tcpm_state state,
1279                                 unsigned int delay_ms)
1280 {
1281         if (port->enter_state == port->state)
1282                 tcpm_set_state(port, state, delay_ms);
1283         else
1284                 tcpm_log(port,
1285                          "skipped %sstate change %s -> %s [%u ms], context state %s [%s %s]",
1286                          delay_ms ? "delayed " : "",
1287                          tcpm_states[port->state], tcpm_states[state],
1288                          delay_ms, tcpm_states[port->enter_state],
1289                          pd_rev[port->negotiated_rev], tcpm_ams_str[port->ams]);
1290 }
1291
1292 static void tcpm_queue_message(struct tcpm_port *port,
1293                                enum pd_msg_request message)
1294 {
1295         port->queued_message = message;
1296         mod_tcpm_delayed_work(port, 0);
1297 }
1298
1299 static bool tcpm_vdm_ams(struct tcpm_port *port)
1300 {
1301         switch (port->ams) {
1302         case DISCOVER_IDENTITY:
1303         case SOURCE_STARTUP_CABLE_PLUG_DISCOVER_IDENTITY:
1304         case DISCOVER_SVIDS:
1305         case DISCOVER_MODES:
1306         case DFP_TO_UFP_ENTER_MODE:
1307         case DFP_TO_UFP_EXIT_MODE:
1308         case DFP_TO_CABLE_PLUG_ENTER_MODE:
1309         case DFP_TO_CABLE_PLUG_EXIT_MODE:
1310         case ATTENTION:
1311         case UNSTRUCTURED_VDMS:
1312         case STRUCTURED_VDMS:
1313                 break;
1314         default:
1315                 return false;
1316         }
1317
1318         return true;
1319 }
1320
1321 static bool tcpm_ams_interruptible(struct tcpm_port *port)
1322 {
1323         switch (port->ams) {
1324         /* Interruptible AMS */
1325         case NONE_AMS:
1326         case SECURITY:
1327         case FIRMWARE_UPDATE:
1328         case DISCOVER_IDENTITY:
1329         case SOURCE_STARTUP_CABLE_PLUG_DISCOVER_IDENTITY:
1330         case DISCOVER_SVIDS:
1331         case DISCOVER_MODES:
1332         case DFP_TO_UFP_ENTER_MODE:
1333         case DFP_TO_UFP_EXIT_MODE:
1334         case DFP_TO_CABLE_PLUG_ENTER_MODE:
1335         case DFP_TO_CABLE_PLUG_EXIT_MODE:
1336         case UNSTRUCTURED_VDMS:
1337         case STRUCTURED_VDMS:
1338         case COUNTRY_INFO:
1339         case COUNTRY_CODES:
1340                 break;
1341         /* Non-Interruptible AMS */
1342         default:
1343                 if (port->in_ams)
1344                         return false;
1345                 break;
1346         }
1347
1348         return true;
1349 }
1350
1351 static int tcpm_ams_start(struct tcpm_port *port, enum tcpm_ams ams)
1352 {
1353         int ret = 0;
1354
1355         tcpm_log(port, "AMS %s start", tcpm_ams_str[ams]);
1356
1357         if (!tcpm_ams_interruptible(port) &&
1358             !(ams == HARD_RESET || ams == SOFT_RESET_AMS)) {
1359                 port->upcoming_state = INVALID_STATE;
1360                 tcpm_log(port, "AMS %s not interruptible, aborting",
1361                          tcpm_ams_str[port->ams]);
1362                 return -EAGAIN;
1363         }
1364
1365         if (port->pwr_role == TYPEC_SOURCE) {
1366                 enum typec_cc_status cc_req = port->cc_req;
1367
1368                 port->ams = ams;
1369
1370                 if (ams == HARD_RESET) {
1371                         tcpm_set_cc(port, tcpm_rp_cc(port));
1372                         tcpm_pd_transmit(port, TCPC_TX_HARD_RESET, NULL);
1373                         tcpm_set_state(port, HARD_RESET_START, 0);
1374                         return ret;
1375                 } else if (ams == SOFT_RESET_AMS) {
1376                         if (!port->explicit_contract)
1377                                 tcpm_set_cc(port, tcpm_rp_cc(port));
1378                         tcpm_set_state(port, SOFT_RESET_SEND, 0);
1379                         return ret;
1380                 } else if (tcpm_vdm_ams(port)) {
1381                         /* tSinkTx is enforced in vdm_run_state_machine */
1382                         if (port->negotiated_rev >= PD_REV30)
1383                                 tcpm_set_cc(port, SINK_TX_NG);
1384                         return ret;
1385                 }
1386
1387                 if (port->negotiated_rev >= PD_REV30)
1388                         tcpm_set_cc(port, SINK_TX_NG);
1389
1390                 switch (port->state) {
1391                 case SRC_READY:
1392                 case SRC_STARTUP:
1393                 case SRC_SOFT_RESET_WAIT_SNK_TX:
1394                 case SOFT_RESET:
1395                 case SOFT_RESET_SEND:
1396                         if (port->negotiated_rev >= PD_REV30)
1397                                 tcpm_set_state(port, AMS_START,
1398                                                cc_req == SINK_TX_OK ?
1399                                                PD_T_SINK_TX : 0);
1400                         else
1401                                 tcpm_set_state(port, AMS_START, 0);
1402                         break;
1403                 default:
1404                         if (port->negotiated_rev >= PD_REV30)
1405                                 tcpm_set_state(port, SRC_READY,
1406                                                cc_req == SINK_TX_OK ?
1407                                                PD_T_SINK_TX : 0);
1408                         else
1409                                 tcpm_set_state(port, SRC_READY, 0);
1410                         break;
1411                 }
1412         } else {
1413                 if (port->negotiated_rev >= PD_REV30 &&
1414                     !tcpm_sink_tx_ok(port) &&
1415                     ams != SOFT_RESET_AMS &&
1416                     ams != HARD_RESET) {
1417                         port->upcoming_state = INVALID_STATE;
1418                         tcpm_log(port, "Sink TX No Go");
1419                         return -EAGAIN;
1420                 }
1421
1422                 port->ams = ams;
1423
1424                 if (ams == HARD_RESET) {
1425                         tcpm_pd_transmit(port, TCPC_TX_HARD_RESET, NULL);
1426                         tcpm_set_state(port, HARD_RESET_START, 0);
1427                         return ret;
1428                 } else if (tcpm_vdm_ams(port)) {
1429                         return ret;
1430                 }
1431
1432                 if (port->state == SNK_READY ||
1433                     port->state == SNK_SOFT_RESET)
1434                         tcpm_set_state(port, AMS_START, 0);
1435                 else
1436                         tcpm_set_state(port, SNK_READY, 0);
1437         }
1438
1439         return ret;
1440 }
1441
1442 /*
1443  * VDM/VDO handling functions
1444  */
1445 static void tcpm_queue_vdm(struct tcpm_port *port, const u32 header,
1446                            const u32 *data, int cnt)
1447 {
1448         u32 vdo_hdr = port->vdo_data[0];
1449
1450         WARN_ON(!mutex_is_locked(&port->lock));
1451
1452         /* If is sending discover_identity, handle received message first */
1453         if (PD_VDO_SVDM(vdo_hdr) && PD_VDO_CMD(vdo_hdr) == CMD_DISCOVER_IDENT) {
1454                 port->send_discover = true;
1455                 mod_send_discover_delayed_work(port, SEND_DISCOVER_RETRY_MS);
1456         } else {
1457                 /* Make sure we are not still processing a previous VDM packet */
1458                 WARN_ON(port->vdm_state > VDM_STATE_DONE);
1459         }
1460
1461         port->vdo_count = cnt + 1;
1462         port->vdo_data[0] = header;
1463         memcpy(&port->vdo_data[1], data, sizeof(u32) * cnt);
1464         /* Set ready, vdm state machine will actually send */
1465         port->vdm_retries = 0;
1466         port->vdm_state = VDM_STATE_READY;
1467         port->vdm_sm_running = true;
1468
1469         mod_vdm_delayed_work(port, 0);
1470 }
1471
1472 static void tcpm_queue_vdm_unlocked(struct tcpm_port *port, const u32 header,
1473                                     const u32 *data, int cnt)
1474 {
1475         mutex_lock(&port->lock);
1476         tcpm_queue_vdm(port, header, data, cnt);
1477         mutex_unlock(&port->lock);
1478 }
1479
1480 static void svdm_consume_identity(struct tcpm_port *port, const u32 *p, int cnt)
1481 {
1482         u32 vdo = p[VDO_INDEX_IDH];
1483         u32 product = p[VDO_INDEX_PRODUCT];
1484
1485         memset(&port->mode_data, 0, sizeof(port->mode_data));
1486
1487         port->partner_ident.id_header = vdo;
1488         port->partner_ident.cert_stat = p[VDO_INDEX_CSTAT];
1489         port->partner_ident.product = product;
1490
1491         typec_partner_set_identity(port->partner);
1492
1493         tcpm_log(port, "Identity: %04x:%04x.%04x",
1494                  PD_IDH_VID(vdo),
1495                  PD_PRODUCT_PID(product), product & 0xffff);
1496 }
1497
1498 static bool svdm_consume_svids(struct tcpm_port *port, const u32 *p, int cnt)
1499 {
1500         struct pd_mode_data *pmdata = &port->mode_data;
1501         int i;
1502
1503         for (i = 1; i < cnt; i++) {
1504                 u16 svid;
1505
1506                 svid = (p[i] >> 16) & 0xffff;
1507                 if (!svid)
1508                         return false;
1509
1510                 if (pmdata->nsvids >= SVID_DISCOVERY_MAX)
1511                         goto abort;
1512
1513                 pmdata->svids[pmdata->nsvids++] = svid;
1514                 tcpm_log(port, "SVID %d: 0x%x", pmdata->nsvids, svid);
1515
1516                 svid = p[i] & 0xffff;
1517                 if (!svid)
1518                         return false;
1519
1520                 if (pmdata->nsvids >= SVID_DISCOVERY_MAX)
1521                         goto abort;
1522
1523                 pmdata->svids[pmdata->nsvids++] = svid;
1524                 tcpm_log(port, "SVID %d: 0x%x", pmdata->nsvids, svid);
1525         }
1526
1527         /*
1528          * PD3.0 Spec 6.4.4.3.2: The SVIDs are returned 2 per VDO (see Table
1529          * 6-43), and can be returned maximum 6 VDOs per response (see Figure
1530          * 6-19). If the Respondersupports 12 or more SVID then the Discover
1531          * SVIDs Command Shall be executed multiple times until a Discover
1532          * SVIDs VDO is returned ending either with a SVID value of 0x0000 in
1533          * the last part of the last VDO or with a VDO containing two SVIDs
1534          * with values of 0x0000.
1535          *
1536          * However, some odd dockers support SVIDs less than 12 but without
1537          * 0x0000 in the last VDO, so we need to break the Discover SVIDs
1538          * request and return false here.
1539          */
1540         return cnt == 7;
1541 abort:
1542         tcpm_log(port, "SVID_DISCOVERY_MAX(%d) too low!", SVID_DISCOVERY_MAX);
1543         return false;
1544 }
1545
1546 static void svdm_consume_modes(struct tcpm_port *port, const u32 *p, int cnt)
1547 {
1548         struct pd_mode_data *pmdata = &port->mode_data;
1549         struct typec_altmode_desc *paltmode;
1550         int i;
1551
1552         if (pmdata->altmodes >= ARRAY_SIZE(port->partner_altmode)) {
1553                 /* Already logged in svdm_consume_svids() */
1554                 return;
1555         }
1556
1557         for (i = 1; i < cnt; i++) {
1558                 paltmode = &pmdata->altmode_desc[pmdata->altmodes];
1559                 memset(paltmode, 0, sizeof(*paltmode));
1560
1561                 paltmode->svid = pmdata->svids[pmdata->svid_index];
1562                 paltmode->mode = i;
1563                 paltmode->vdo = p[i];
1564
1565                 tcpm_log(port, " Alternate mode %d: SVID 0x%04x, VDO %d: 0x%08x",
1566                          pmdata->altmodes, paltmode->svid,
1567                          paltmode->mode, paltmode->vdo);
1568
1569                 pmdata->altmodes++;
1570         }
1571 }
1572
1573 static void tcpm_register_partner_altmodes(struct tcpm_port *port)
1574 {
1575         struct pd_mode_data *modep = &port->mode_data;
1576         struct typec_altmode *altmode;
1577         int i;
1578
1579         for (i = 0; i < modep->altmodes; i++) {
1580                 altmode = typec_partner_register_altmode(port->partner,
1581                                                 &modep->altmode_desc[i]);
1582                 if (IS_ERR(altmode)) {
1583                         tcpm_log(port, "Failed to register partner SVID 0x%04x",
1584                                  modep->altmode_desc[i].svid);
1585                         altmode = NULL;
1586                 }
1587                 port->partner_altmode[i] = altmode;
1588         }
1589 }
1590
1591 #define supports_modal(port)    PD_IDH_MODAL_SUPP((port)->partner_ident.id_header)
1592
1593 static int tcpm_pd_svdm(struct tcpm_port *port, struct typec_altmode *adev,
1594                         const u32 *p, int cnt, u32 *response,
1595                         enum adev_actions *adev_action)
1596 {
1597         struct typec_port *typec = port->typec_port;
1598         struct typec_altmode *pdev;
1599         struct pd_mode_data *modep;
1600         int svdm_version;
1601         int rlen = 0;
1602         int cmd_type;
1603         int cmd;
1604         int i;
1605
1606         cmd_type = PD_VDO_CMDT(p[0]);
1607         cmd = PD_VDO_CMD(p[0]);
1608
1609         tcpm_log(port, "Rx VDM cmd 0x%x type %d cmd %d len %d",
1610                  p[0], cmd_type, cmd, cnt);
1611
1612         modep = &port->mode_data;
1613
1614         pdev = typec_match_altmode(port->partner_altmode, ALTMODE_DISCOVERY_MAX,
1615                                    PD_VDO_VID(p[0]), PD_VDO_OPOS(p[0]));
1616
1617         svdm_version = typec_get_negotiated_svdm_version(typec);
1618         if (svdm_version < 0)
1619                 return 0;
1620
1621         switch (cmd_type) {
1622         case CMDT_INIT:
1623                 switch (cmd) {
1624                 case CMD_DISCOVER_IDENT:
1625                         if (PD_VDO_VID(p[0]) != USB_SID_PD)
1626                                 break;
1627
1628                         if (IS_ERR_OR_NULL(port->partner))
1629                                 break;
1630
1631                         if (PD_VDO_SVDM_VER(p[0]) < svdm_version) {
1632                                 typec_partner_set_svdm_version(port->partner,
1633                                                                PD_VDO_SVDM_VER(p[0]));
1634                                 svdm_version = PD_VDO_SVDM_VER(p[0]);
1635                         }
1636
1637                         port->ams = DISCOVER_IDENTITY;
1638                         /*
1639                          * PD2.0 Spec 6.10.3: respond with NAK as DFP (data host)
1640                          * PD3.1 Spec 6.4.4.2.5.1: respond with NAK if "invalid field" or
1641                          * "wrong configuation" or "Unrecognized"
1642                          */
1643                         if ((port->data_role == TYPEC_DEVICE || svdm_version >= SVDM_VER_2_0) &&
1644                             port->nr_snk_vdo) {
1645                                 if (svdm_version < SVDM_VER_2_0) {
1646                                         for (i = 0; i < port->nr_snk_vdo_v1; i++)
1647                                                 response[i + 1] = port->snk_vdo_v1[i];
1648                                         rlen = port->nr_snk_vdo_v1 + 1;
1649
1650                                 } else {
1651                                         for (i = 0; i < port->nr_snk_vdo; i++)
1652                                                 response[i + 1] = port->snk_vdo[i];
1653                                         rlen = port->nr_snk_vdo + 1;
1654                                 }
1655                         }
1656                         break;
1657                 case CMD_DISCOVER_SVID:
1658                         port->ams = DISCOVER_SVIDS;
1659                         break;
1660                 case CMD_DISCOVER_MODES:
1661                         port->ams = DISCOVER_MODES;
1662                         break;
1663                 case CMD_ENTER_MODE:
1664                         port->ams = DFP_TO_UFP_ENTER_MODE;
1665                         break;
1666                 case CMD_EXIT_MODE:
1667                         port->ams = DFP_TO_UFP_EXIT_MODE;
1668                         break;
1669                 case CMD_ATTENTION:
1670                         /* Attention command does not have response */
1671                         *adev_action = ADEV_ATTENTION;
1672                         return 0;
1673                 default:
1674                         break;
1675                 }
1676                 if (rlen >= 1) {
1677                         response[0] = p[0] | VDO_CMDT(CMDT_RSP_ACK);
1678                 } else if (rlen == 0) {
1679                         response[0] = p[0] | VDO_CMDT(CMDT_RSP_NAK);
1680                         rlen = 1;
1681                 } else {
1682                         response[0] = p[0] | VDO_CMDT(CMDT_RSP_BUSY);
1683                         rlen = 1;
1684                 }
1685                 response[0] = (response[0] & ~VDO_SVDM_VERS_MASK) |
1686                               (VDO_SVDM_VERS(typec_get_negotiated_svdm_version(typec)));
1687                 break;
1688         case CMDT_RSP_ACK:
1689                 /* silently drop message if we are not connected */
1690                 if (IS_ERR_OR_NULL(port->partner))
1691                         break;
1692
1693                 tcpm_ams_finish(port);
1694
1695                 switch (cmd) {
1696                 case CMD_DISCOVER_IDENT:
1697                         if (PD_VDO_SVDM_VER(p[0]) < svdm_version)
1698                                 typec_partner_set_svdm_version(port->partner,
1699                                                                PD_VDO_SVDM_VER(p[0]));
1700                         /* 6.4.4.3.1 */
1701                         svdm_consume_identity(port, p, cnt);
1702                         response[0] = VDO(USB_SID_PD, 1, typec_get_negotiated_svdm_version(typec),
1703                                           CMD_DISCOVER_SVID);
1704                         rlen = 1;
1705                         break;
1706                 case CMD_DISCOVER_SVID:
1707                         /* 6.4.4.3.2 */
1708                         if (svdm_consume_svids(port, p, cnt)) {
1709                                 response[0] = VDO(USB_SID_PD, 1, svdm_version, CMD_DISCOVER_SVID);
1710                                 rlen = 1;
1711                         } else if (modep->nsvids && supports_modal(port)) {
1712                                 response[0] = VDO(modep->svids[0], 1, svdm_version,
1713                                                   CMD_DISCOVER_MODES);
1714                                 rlen = 1;
1715                         }
1716                         break;
1717                 case CMD_DISCOVER_MODES:
1718                         /* 6.4.4.3.3 */
1719                         svdm_consume_modes(port, p, cnt);
1720                         modep->svid_index++;
1721                         if (modep->svid_index < modep->nsvids) {
1722                                 u16 svid = modep->svids[modep->svid_index];
1723                                 response[0] = VDO(svid, 1, svdm_version, CMD_DISCOVER_MODES);
1724                                 rlen = 1;
1725                         } else {
1726                                 tcpm_register_partner_altmodes(port);
1727                         }
1728                         break;
1729                 case CMD_ENTER_MODE:
1730                         if (adev && pdev)
1731                                 *adev_action = ADEV_QUEUE_VDM_SEND_EXIT_MODE_ON_FAIL;
1732                         return 0;
1733                 case CMD_EXIT_MODE:
1734                         if (adev && pdev) {
1735                                 /* Back to USB Operation */
1736                                 *adev_action = ADEV_NOTIFY_USB_AND_QUEUE_VDM;
1737                                 return 0;
1738                         }
1739                         break;
1740                 case VDO_CMD_VENDOR(0) ... VDO_CMD_VENDOR(15):
1741                         break;
1742                 default:
1743                         /* Unrecognized SVDM */
1744                         response[0] = p[0] | VDO_CMDT(CMDT_RSP_NAK);
1745                         rlen = 1;
1746                         response[0] = (response[0] & ~VDO_SVDM_VERS_MASK) |
1747                                       (VDO_SVDM_VERS(svdm_version));
1748                         break;
1749                 }
1750                 break;
1751         case CMDT_RSP_NAK:
1752                 tcpm_ams_finish(port);
1753                 switch (cmd) {
1754                 case CMD_DISCOVER_IDENT:
1755                 case CMD_DISCOVER_SVID:
1756                 case CMD_DISCOVER_MODES:
1757                 case VDO_CMD_VENDOR(0) ... VDO_CMD_VENDOR(15):
1758                         break;
1759                 case CMD_ENTER_MODE:
1760                         /* Back to USB Operation */
1761                         *adev_action = ADEV_NOTIFY_USB_AND_QUEUE_VDM;
1762                         return 0;
1763                 default:
1764                         /* Unrecognized SVDM */
1765                         response[0] = p[0] | VDO_CMDT(CMDT_RSP_NAK);
1766                         rlen = 1;
1767                         response[0] = (response[0] & ~VDO_SVDM_VERS_MASK) |
1768                                       (VDO_SVDM_VERS(svdm_version));
1769                         break;
1770                 }
1771                 break;
1772         default:
1773                 response[0] = p[0] | VDO_CMDT(CMDT_RSP_NAK);
1774                 rlen = 1;
1775                 response[0] = (response[0] & ~VDO_SVDM_VERS_MASK) |
1776                               (VDO_SVDM_VERS(svdm_version));
1777                 break;
1778         }
1779
1780         /* Informing the alternate mode drivers about everything */
1781         *adev_action = ADEV_QUEUE_VDM;
1782         return rlen;
1783 }
1784
1785 static void tcpm_pd_handle_msg(struct tcpm_port *port,
1786                                enum pd_msg_request message,
1787                                enum tcpm_ams ams);
1788
1789 static void tcpm_handle_vdm_request(struct tcpm_port *port,
1790                                     const __le32 *payload, int cnt)
1791 {
1792         enum adev_actions adev_action = ADEV_NONE;
1793         struct typec_altmode *adev;
1794         u32 p[PD_MAX_PAYLOAD];
1795         u32 response[8] = { };
1796         int i, rlen = 0;
1797
1798         for (i = 0; i < cnt; i++)
1799                 p[i] = le32_to_cpu(payload[i]);
1800
1801         adev = typec_match_altmode(port->port_altmode, ALTMODE_DISCOVERY_MAX,
1802                                    PD_VDO_VID(p[0]), PD_VDO_OPOS(p[0]));
1803
1804         if (port->vdm_state == VDM_STATE_BUSY) {
1805                 /* If UFP responded busy retry after timeout */
1806                 if (PD_VDO_CMDT(p[0]) == CMDT_RSP_BUSY) {
1807                         port->vdm_state = VDM_STATE_WAIT_RSP_BUSY;
1808                         port->vdo_retry = (p[0] & ~VDO_CMDT_MASK) |
1809                                 CMDT_INIT;
1810                         mod_vdm_delayed_work(port, PD_T_VDM_BUSY);
1811                         return;
1812                 }
1813                 port->vdm_state = VDM_STATE_DONE;
1814         }
1815
1816         if (PD_VDO_SVDM(p[0]) && (adev || tcpm_vdm_ams(port) || port->nr_snk_vdo)) {
1817                 /*
1818                  * Here a SVDM is received (INIT or RSP or unknown). Set the vdm_sm_running in
1819                  * advance because we are dropping the lock but may send VDMs soon.
1820                  * For the cases of INIT received:
1821                  *  - If no response to send, it will be cleared later in this function.
1822                  *  - If there are responses to send, it will be cleared in the state machine.
1823                  * For the cases of RSP received:
1824                  *  - If no further INIT to send, it will be cleared later in this function.
1825                  *  - Otherwise, it will be cleared in the state machine if timeout or it will go
1826                  *    back here until no further INIT to send.
1827                  * For the cases of unknown type received:
1828                  *  - We will send NAK and the flag will be cleared in the state machine.
1829                  */
1830                 port->vdm_sm_running = true;
1831                 rlen = tcpm_pd_svdm(port, adev, p, cnt, response, &adev_action);
1832         } else {
1833                 if (port->negotiated_rev >= PD_REV30)
1834                         tcpm_pd_handle_msg(port, PD_MSG_CTRL_NOT_SUPP, NONE_AMS);
1835         }
1836
1837         /*
1838          * We are done with any state stored in the port struct now, except
1839          * for any port struct changes done by the tcpm_queue_vdm() call
1840          * below, which is a separate operation.
1841          *
1842          * So we can safely release the lock here; and we MUST release the
1843          * lock here to avoid an AB BA lock inversion:
1844          *
1845          * If we keep the lock here then the lock ordering in this path is:
1846          * 1. tcpm_pd_rx_handler take the tcpm port lock
1847          * 2. One of the typec_altmode_* calls below takes the alt-mode's lock
1848          *
1849          * And we also have this ordering:
1850          * 1. alt-mode driver takes the alt-mode's lock
1851          * 2. alt-mode driver calls tcpm_altmode_enter which takes the
1852          *    tcpm port lock
1853          *
1854          * Dropping our lock here avoids this.
1855          */
1856         mutex_unlock(&port->lock);
1857
1858         if (adev) {
1859                 switch (adev_action) {
1860                 case ADEV_NONE:
1861                         break;
1862                 case ADEV_NOTIFY_USB_AND_QUEUE_VDM:
1863                         WARN_ON(typec_altmode_notify(adev, TYPEC_STATE_USB, NULL));
1864                         typec_altmode_vdm(adev, p[0], &p[1], cnt);
1865                         break;
1866                 case ADEV_QUEUE_VDM:
1867                         typec_altmode_vdm(adev, p[0], &p[1], cnt);
1868                         break;
1869                 case ADEV_QUEUE_VDM_SEND_EXIT_MODE_ON_FAIL:
1870                         if (typec_altmode_vdm(adev, p[0], &p[1], cnt)) {
1871                                 int svdm_version = typec_get_negotiated_svdm_version(
1872                                                                         port->typec_port);
1873                                 if (svdm_version < 0)
1874                                         break;
1875
1876                                 response[0] = VDO(adev->svid, 1, svdm_version,
1877                                                   CMD_EXIT_MODE);
1878                                 response[0] |= VDO_OPOS(adev->mode);
1879                                 rlen = 1;
1880                         }
1881                         break;
1882                 case ADEV_ATTENTION:
1883                         if (typec_altmode_attention(adev, p[1]))
1884                                 tcpm_log(port, "typec_altmode_attention no port partner altmode");
1885                         break;
1886                 }
1887         }
1888
1889         /*
1890          * We must re-take the lock here to balance the unlock in
1891          * tcpm_pd_rx_handler, note that no changes, other then the
1892          * tcpm_queue_vdm call, are made while the lock is held again.
1893          * All that is done after the call is unwinding the call stack until
1894          * we return to tcpm_pd_rx_handler and do the unlock there.
1895          */
1896         mutex_lock(&port->lock);
1897
1898         if (rlen > 0)
1899                 tcpm_queue_vdm(port, response[0], &response[1], rlen - 1);
1900         else
1901                 port->vdm_sm_running = false;
1902 }
1903
1904 static void tcpm_send_vdm(struct tcpm_port *port, u32 vid, int cmd,
1905                           const u32 *data, int count)
1906 {
1907         int svdm_version = typec_get_negotiated_svdm_version(port->typec_port);
1908         u32 header;
1909
1910         if (svdm_version < 0)
1911                 return;
1912
1913         if (WARN_ON(count > VDO_MAX_SIZE - 1))
1914                 count = VDO_MAX_SIZE - 1;
1915
1916         /* set VDM header with VID & CMD */
1917         header = VDO(vid, ((vid & USB_SID_PD) == USB_SID_PD) ?
1918                         1 : (PD_VDO_CMD(cmd) <= CMD_ATTENTION),
1919                         svdm_version, cmd);
1920         tcpm_queue_vdm(port, header, data, count);
1921 }
1922
1923 static unsigned int vdm_ready_timeout(u32 vdm_hdr)
1924 {
1925         unsigned int timeout;
1926         int cmd = PD_VDO_CMD(vdm_hdr);
1927
1928         /* its not a structured VDM command */
1929         if (!PD_VDO_SVDM(vdm_hdr))
1930                 return PD_T_VDM_UNSTRUCTURED;
1931
1932         switch (PD_VDO_CMDT(vdm_hdr)) {
1933         case CMDT_INIT:
1934                 if (cmd == CMD_ENTER_MODE || cmd == CMD_EXIT_MODE)
1935                         timeout = PD_T_VDM_WAIT_MODE_E;
1936                 else
1937                         timeout = PD_T_VDM_SNDR_RSP;
1938                 break;
1939         default:
1940                 if (cmd == CMD_ENTER_MODE || cmd == CMD_EXIT_MODE)
1941                         timeout = PD_T_VDM_E_MODE;
1942                 else
1943                         timeout = PD_T_VDM_RCVR_RSP;
1944                 break;
1945         }
1946         return timeout;
1947 }
1948
1949 static void vdm_run_state_machine(struct tcpm_port *port)
1950 {
1951         struct pd_message msg;
1952         int i, res = 0;
1953         u32 vdo_hdr = port->vdo_data[0];
1954
1955         switch (port->vdm_state) {
1956         case VDM_STATE_READY:
1957                 /* Only transmit VDM if attached */
1958                 if (!port->attached) {
1959                         port->vdm_state = VDM_STATE_ERR_BUSY;
1960                         break;
1961                 }
1962
1963                 /*
1964                  * if there's traffic or we're not in PDO ready state don't send
1965                  * a VDM.
1966                  */
1967                 if (port->state != SRC_READY && port->state != SNK_READY) {
1968                         port->vdm_sm_running = false;
1969                         break;
1970                 }
1971
1972                 /* TODO: AMS operation for Unstructured VDM */
1973                 if (PD_VDO_SVDM(vdo_hdr) && PD_VDO_CMDT(vdo_hdr) == CMDT_INIT) {
1974                         switch (PD_VDO_CMD(vdo_hdr)) {
1975                         case CMD_DISCOVER_IDENT:
1976                                 res = tcpm_ams_start(port, DISCOVER_IDENTITY);
1977                                 if (res == 0) {
1978                                         port->send_discover = false;
1979                                 } else if (res == -EAGAIN) {
1980                                         port->vdo_data[0] = 0;
1981                                         mod_send_discover_delayed_work(port,
1982                                                                        SEND_DISCOVER_RETRY_MS);
1983                                 }
1984                                 break;
1985                         case CMD_DISCOVER_SVID:
1986                                 res = tcpm_ams_start(port, DISCOVER_SVIDS);
1987                                 break;
1988                         case CMD_DISCOVER_MODES:
1989                                 res = tcpm_ams_start(port, DISCOVER_MODES);
1990                                 break;
1991                         case CMD_ENTER_MODE:
1992                                 res = tcpm_ams_start(port, DFP_TO_UFP_ENTER_MODE);
1993                                 break;
1994                         case CMD_EXIT_MODE:
1995                                 res = tcpm_ams_start(port, DFP_TO_UFP_EXIT_MODE);
1996                                 break;
1997                         case CMD_ATTENTION:
1998                                 res = tcpm_ams_start(port, ATTENTION);
1999                                 break;
2000                         case VDO_CMD_VENDOR(0) ... VDO_CMD_VENDOR(15):
2001                                 res = tcpm_ams_start(port, STRUCTURED_VDMS);
2002                                 break;
2003                         default:
2004                                 res = -EOPNOTSUPP;
2005                                 break;
2006                         }
2007
2008                         if (res < 0) {
2009                                 port->vdm_state = VDM_STATE_ERR_BUSY;
2010                                 return;
2011                         }
2012                 }
2013
2014                 port->vdm_state = VDM_STATE_SEND_MESSAGE;
2015                 mod_vdm_delayed_work(port, (port->negotiated_rev >= PD_REV30 &&
2016                                             port->pwr_role == TYPEC_SOURCE &&
2017                                             PD_VDO_SVDM(vdo_hdr) &&
2018                                             PD_VDO_CMDT(vdo_hdr) == CMDT_INIT) ?
2019                                            PD_T_SINK_TX : 0);
2020                 break;
2021         case VDM_STATE_WAIT_RSP_BUSY:
2022                 port->vdo_data[0] = port->vdo_retry;
2023                 port->vdo_count = 1;
2024                 port->vdm_state = VDM_STATE_READY;
2025                 tcpm_ams_finish(port);
2026                 break;
2027         case VDM_STATE_BUSY:
2028                 port->vdm_state = VDM_STATE_ERR_TMOUT;
2029                 if (port->ams != NONE_AMS)
2030                         tcpm_ams_finish(port);
2031                 break;
2032         case VDM_STATE_ERR_SEND:
2033                 /*
2034                  * A partner which does not support USB PD will not reply,
2035                  * so this is not a fatal error. At the same time, some
2036                  * devices may not return GoodCRC under some circumstances,
2037                  * so we need to retry.
2038                  */
2039                 if (port->vdm_retries < 3) {
2040                         tcpm_log(port, "VDM Tx error, retry");
2041                         port->vdm_retries++;
2042                         port->vdm_state = VDM_STATE_READY;
2043                         if (PD_VDO_SVDM(vdo_hdr) && PD_VDO_CMDT(vdo_hdr) == CMDT_INIT)
2044                                 tcpm_ams_finish(port);
2045                 } else {
2046                         tcpm_ams_finish(port);
2047                 }
2048                 break;
2049         case VDM_STATE_SEND_MESSAGE:
2050                 /* Prepare and send VDM */
2051                 memset(&msg, 0, sizeof(msg));
2052                 msg.header = PD_HEADER_LE(PD_DATA_VENDOR_DEF,
2053                                           port->pwr_role,
2054                                           port->data_role,
2055                                           port->negotiated_rev,
2056                                           port->message_id, port->vdo_count);
2057                 for (i = 0; i < port->vdo_count; i++)
2058                         msg.payload[i] = cpu_to_le32(port->vdo_data[i]);
2059                 res = tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
2060                 if (res < 0) {
2061                         port->vdm_state = VDM_STATE_ERR_SEND;
2062                 } else {
2063                         unsigned long timeout;
2064
2065                         port->vdm_retries = 0;
2066                         port->vdo_data[0] = 0;
2067                         port->vdm_state = VDM_STATE_BUSY;
2068                         timeout = vdm_ready_timeout(vdo_hdr);
2069                         mod_vdm_delayed_work(port, timeout);
2070                 }
2071                 break;
2072         default:
2073                 break;
2074         }
2075 }
2076
2077 static void vdm_state_machine_work(struct kthread_work *work)
2078 {
2079         struct tcpm_port *port = container_of(work, struct tcpm_port, vdm_state_machine);
2080         enum vdm_states prev_state;
2081
2082         mutex_lock(&port->lock);
2083
2084         /*
2085          * Continue running as long as the port is not busy and there was
2086          * a state change.
2087          */
2088         do {
2089                 prev_state = port->vdm_state;
2090                 vdm_run_state_machine(port);
2091         } while (port->vdm_state != prev_state &&
2092                  port->vdm_state != VDM_STATE_BUSY &&
2093                  port->vdm_state != VDM_STATE_SEND_MESSAGE);
2094
2095         if (port->vdm_state < VDM_STATE_READY)
2096                 port->vdm_sm_running = false;
2097
2098         mutex_unlock(&port->lock);
2099 }
2100
2101 enum pdo_err {
2102         PDO_NO_ERR,
2103         PDO_ERR_NO_VSAFE5V,
2104         PDO_ERR_VSAFE5V_NOT_FIRST,
2105         PDO_ERR_PDO_TYPE_NOT_IN_ORDER,
2106         PDO_ERR_FIXED_NOT_SORTED,
2107         PDO_ERR_VARIABLE_BATT_NOT_SORTED,
2108         PDO_ERR_DUPE_PDO,
2109         PDO_ERR_PPS_APDO_NOT_SORTED,
2110         PDO_ERR_DUPE_PPS_APDO,
2111 };
2112
2113 static const char * const pdo_err_msg[] = {
2114         [PDO_ERR_NO_VSAFE5V] =
2115         " err: source/sink caps should at least have vSafe5V",
2116         [PDO_ERR_VSAFE5V_NOT_FIRST] =
2117         " err: vSafe5V Fixed Supply Object Shall always be the first object",
2118         [PDO_ERR_PDO_TYPE_NOT_IN_ORDER] =
2119         " err: PDOs should be in the following order: Fixed; Battery; Variable",
2120         [PDO_ERR_FIXED_NOT_SORTED] =
2121         " err: Fixed supply pdos should be in increasing order of their fixed voltage",
2122         [PDO_ERR_VARIABLE_BATT_NOT_SORTED] =
2123         " err: Variable/Battery supply pdos should be in increasing order of their minimum voltage",
2124         [PDO_ERR_DUPE_PDO] =
2125         " err: Variable/Batt supply pdos cannot have same min/max voltage",
2126         [PDO_ERR_PPS_APDO_NOT_SORTED] =
2127         " err: Programmable power supply apdos should be in increasing order of their maximum voltage",
2128         [PDO_ERR_DUPE_PPS_APDO] =
2129         " err: Programmable power supply apdos cannot have same min/max voltage and max current",
2130 };
2131
2132 static enum pdo_err tcpm_caps_err(struct tcpm_port *port, const u32 *pdo,
2133                                   unsigned int nr_pdo)
2134 {
2135         unsigned int i;
2136
2137         /* Should at least contain vSafe5v */
2138         if (nr_pdo < 1)
2139                 return PDO_ERR_NO_VSAFE5V;
2140
2141         /* The vSafe5V Fixed Supply Object Shall always be the first object */
2142         if (pdo_type(pdo[0]) != PDO_TYPE_FIXED ||
2143             pdo_fixed_voltage(pdo[0]) != VSAFE5V)
2144                 return PDO_ERR_VSAFE5V_NOT_FIRST;
2145
2146         for (i = 1; i < nr_pdo; i++) {
2147                 if (pdo_type(pdo[i]) < pdo_type(pdo[i - 1])) {
2148                         return PDO_ERR_PDO_TYPE_NOT_IN_ORDER;
2149                 } else if (pdo_type(pdo[i]) == pdo_type(pdo[i - 1])) {
2150                         enum pd_pdo_type type = pdo_type(pdo[i]);
2151
2152                         switch (type) {
2153                         /*
2154                          * The remaining Fixed Supply Objects, if
2155                          * present, shall be sent in voltage order;
2156                          * lowest to highest.
2157                          */
2158                         case PDO_TYPE_FIXED:
2159                                 if (pdo_fixed_voltage(pdo[i]) <=
2160                                     pdo_fixed_voltage(pdo[i - 1]))
2161                                         return PDO_ERR_FIXED_NOT_SORTED;
2162                                 break;
2163                         /*
2164                          * The Battery Supply Objects and Variable
2165                          * supply, if present shall be sent in Minimum
2166                          * Voltage order; lowest to highest.
2167                          */
2168                         case PDO_TYPE_VAR:
2169                         case PDO_TYPE_BATT:
2170                                 if (pdo_min_voltage(pdo[i]) <
2171                                     pdo_min_voltage(pdo[i - 1]))
2172                                         return PDO_ERR_VARIABLE_BATT_NOT_SORTED;
2173                                 else if ((pdo_min_voltage(pdo[i]) ==
2174                                           pdo_min_voltage(pdo[i - 1])) &&
2175                                          (pdo_max_voltage(pdo[i]) ==
2176                                           pdo_max_voltage(pdo[i - 1])))
2177                                         return PDO_ERR_DUPE_PDO;
2178                                 break;
2179                         /*
2180                          * The Programmable Power Supply APDOs, if present,
2181                          * shall be sent in Maximum Voltage order;
2182                          * lowest to highest.
2183                          */
2184                         case PDO_TYPE_APDO:
2185                                 if (pdo_apdo_type(pdo[i]) != APDO_TYPE_PPS)
2186                                         break;
2187
2188                                 if (pdo_pps_apdo_max_voltage(pdo[i]) <
2189                                     pdo_pps_apdo_max_voltage(pdo[i - 1]))
2190                                         return PDO_ERR_PPS_APDO_NOT_SORTED;
2191                                 else if (pdo_pps_apdo_min_voltage(pdo[i]) ==
2192                                           pdo_pps_apdo_min_voltage(pdo[i - 1]) &&
2193                                          pdo_pps_apdo_max_voltage(pdo[i]) ==
2194                                           pdo_pps_apdo_max_voltage(pdo[i - 1]) &&
2195                                          pdo_pps_apdo_max_current(pdo[i]) ==
2196                                           pdo_pps_apdo_max_current(pdo[i - 1]))
2197                                         return PDO_ERR_DUPE_PPS_APDO;
2198                                 break;
2199                         default:
2200                                 tcpm_log_force(port, " Unknown pdo type");
2201                         }
2202                 }
2203         }
2204
2205         return PDO_NO_ERR;
2206 }
2207
2208 static int tcpm_validate_caps(struct tcpm_port *port, const u32 *pdo,
2209                               unsigned int nr_pdo)
2210 {
2211         enum pdo_err err_index = tcpm_caps_err(port, pdo, nr_pdo);
2212
2213         if (err_index != PDO_NO_ERR) {
2214                 tcpm_log_force(port, " %s", pdo_err_msg[err_index]);
2215                 return -EINVAL;
2216         }
2217
2218         return 0;
2219 }
2220
2221 static int tcpm_altmode_enter(struct typec_altmode *altmode, u32 *vdo)
2222 {
2223         struct tcpm_port *port = typec_altmode_get_drvdata(altmode);
2224         int svdm_version;
2225         u32 header;
2226
2227         svdm_version = typec_get_negotiated_svdm_version(port->typec_port);
2228         if (svdm_version < 0)
2229                 return svdm_version;
2230
2231         header = VDO(altmode->svid, vdo ? 2 : 1, svdm_version, CMD_ENTER_MODE);
2232         header |= VDO_OPOS(altmode->mode);
2233
2234         tcpm_queue_vdm_unlocked(port, header, vdo, vdo ? 1 : 0);
2235         return 0;
2236 }
2237
2238 static int tcpm_altmode_exit(struct typec_altmode *altmode)
2239 {
2240         struct tcpm_port *port = typec_altmode_get_drvdata(altmode);
2241         int svdm_version;
2242         u32 header;
2243
2244         svdm_version = typec_get_negotiated_svdm_version(port->typec_port);
2245         if (svdm_version < 0)
2246                 return svdm_version;
2247
2248         header = VDO(altmode->svid, 1, svdm_version, CMD_EXIT_MODE);
2249         header |= VDO_OPOS(altmode->mode);
2250
2251         tcpm_queue_vdm_unlocked(port, header, NULL, 0);
2252         return 0;
2253 }
2254
2255 static int tcpm_altmode_vdm(struct typec_altmode *altmode,
2256                             u32 header, const u32 *data, int count)
2257 {
2258         struct tcpm_port *port = typec_altmode_get_drvdata(altmode);
2259
2260         tcpm_queue_vdm_unlocked(port, header, data, count - 1);
2261
2262         return 0;
2263 }
2264
2265 static const struct typec_altmode_ops tcpm_altmode_ops = {
2266         .enter = tcpm_altmode_enter,
2267         .exit = tcpm_altmode_exit,
2268         .vdm = tcpm_altmode_vdm,
2269 };
2270
2271 /*
2272  * PD (data, control) command handling functions
2273  */
2274 static inline enum tcpm_state ready_state(struct tcpm_port *port)
2275 {
2276         if (port->pwr_role == TYPEC_SOURCE)
2277                 return SRC_READY;
2278         else
2279                 return SNK_READY;
2280 }
2281
2282 static int tcpm_pd_send_control(struct tcpm_port *port,
2283                                 enum pd_ctrl_msg_type type);
2284
2285 static void tcpm_handle_alert(struct tcpm_port *port, const __le32 *payload,
2286                               int cnt)
2287 {
2288         u32 p0 = le32_to_cpu(payload[0]);
2289         unsigned int type = usb_pd_ado_type(p0);
2290
2291         if (!type) {
2292                 tcpm_log(port, "Alert message received with no type");
2293                 tcpm_queue_message(port, PD_MSG_CTRL_NOT_SUPP);
2294                 return;
2295         }
2296
2297         /* Just handling non-battery alerts for now */
2298         if (!(type & USB_PD_ADO_TYPE_BATT_STATUS_CHANGE)) {
2299                 if (port->pwr_role == TYPEC_SOURCE) {
2300                         port->upcoming_state = GET_STATUS_SEND;
2301                         tcpm_ams_start(port, GETTING_SOURCE_SINK_STATUS);
2302                 } else {
2303                         /*
2304                          * Do not check SinkTxOk here in case the Source doesn't set its Rp to
2305                          * SinkTxOk in time.
2306                          */
2307                         port->ams = GETTING_SOURCE_SINK_STATUS;
2308                         tcpm_set_state(port, GET_STATUS_SEND, 0);
2309                 }
2310         } else {
2311                 tcpm_queue_message(port, PD_MSG_CTRL_NOT_SUPP);
2312         }
2313 }
2314
2315 static int tcpm_set_auto_vbus_discharge_threshold(struct tcpm_port *port,
2316                                                   enum typec_pwr_opmode mode, bool pps_active,
2317                                                   u32 requested_vbus_voltage)
2318 {
2319         int ret;
2320
2321         if (!port->tcpc->set_auto_vbus_discharge_threshold)
2322                 return 0;
2323
2324         ret = port->tcpc->set_auto_vbus_discharge_threshold(port->tcpc, mode, pps_active,
2325                                                             requested_vbus_voltage);
2326         tcpm_log_force(port,
2327                        "set_auto_vbus_discharge_threshold mode:%d pps_active:%c vbus:%u ret:%d",
2328                        mode, pps_active ? 'y' : 'n', requested_vbus_voltage, ret);
2329
2330         return ret;
2331 }
2332
2333 static void tcpm_pd_handle_state(struct tcpm_port *port,
2334                                  enum tcpm_state state,
2335                                  enum tcpm_ams ams,
2336                                  unsigned int delay_ms)
2337 {
2338         switch (port->state) {
2339         case SRC_READY:
2340         case SNK_READY:
2341                 port->ams = ams;
2342                 tcpm_set_state(port, state, delay_ms);
2343                 break;
2344         /* 8.3.3.4.1.1 and 6.8.1 power transitioning */
2345         case SNK_TRANSITION_SINK:
2346         case SNK_TRANSITION_SINK_VBUS:
2347         case SRC_TRANSITION_SUPPLY:
2348                 tcpm_set_state(port, HARD_RESET_SEND, 0);
2349                 break;
2350         default:
2351                 if (!tcpm_ams_interruptible(port)) {
2352                         tcpm_set_state(port, port->pwr_role == TYPEC_SOURCE ?
2353                                        SRC_SOFT_RESET_WAIT_SNK_TX :
2354                                        SNK_SOFT_RESET,
2355                                        0);
2356                 } else {
2357                         /* process the Message 6.8.1 */
2358                         port->upcoming_state = state;
2359                         port->next_ams = ams;
2360                         tcpm_set_state(port, ready_state(port), delay_ms);
2361                 }
2362                 break;
2363         }
2364 }
2365
2366 static void tcpm_pd_handle_msg(struct tcpm_port *port,
2367                                enum pd_msg_request message,
2368                                enum tcpm_ams ams)
2369 {
2370         switch (port->state) {
2371         case SRC_READY:
2372         case SNK_READY:
2373                 port->ams = ams;
2374                 tcpm_queue_message(port, message);
2375                 break;
2376         /* PD 3.0 Spec 8.3.3.4.1.1 and 6.8.1 */
2377         case SNK_TRANSITION_SINK:
2378         case SNK_TRANSITION_SINK_VBUS:
2379         case SRC_TRANSITION_SUPPLY:
2380                 tcpm_set_state(port, HARD_RESET_SEND, 0);
2381                 break;
2382         default:
2383                 if (!tcpm_ams_interruptible(port)) {
2384                         tcpm_set_state(port, port->pwr_role == TYPEC_SOURCE ?
2385                                        SRC_SOFT_RESET_WAIT_SNK_TX :
2386                                        SNK_SOFT_RESET,
2387                                        0);
2388                 } else {
2389                         port->next_ams = ams;
2390                         tcpm_set_state(port, ready_state(port), 0);
2391                         /* 6.8.1 process the Message */
2392                         tcpm_queue_message(port, message);
2393                 }
2394                 break;
2395         }
2396 }
2397
2398 static int tcpm_register_source_caps(struct tcpm_port *port)
2399 {
2400         struct usb_power_delivery_desc desc = { port->negotiated_rev };
2401         struct usb_power_delivery_capabilities_desc caps = { };
2402         struct usb_power_delivery_capabilities *cap;
2403
2404         if (!port->partner_pd)
2405                 port->partner_pd = usb_power_delivery_register(NULL, &desc);
2406         if (IS_ERR(port->partner_pd))
2407                 return PTR_ERR(port->partner_pd);
2408
2409         memcpy(caps.pdo, port->source_caps, sizeof(u32) * port->nr_source_caps);
2410         caps.role = TYPEC_SOURCE;
2411
2412         cap = usb_power_delivery_register_capabilities(port->partner_pd, &caps);
2413         if (IS_ERR(cap))
2414                 return PTR_ERR(cap);
2415
2416         port->partner_source_caps = cap;
2417
2418         return 0;
2419 }
2420
2421 static int tcpm_register_sink_caps(struct tcpm_port *port)
2422 {
2423         struct usb_power_delivery_desc desc = { port->negotiated_rev };
2424         struct usb_power_delivery_capabilities_desc caps = { };
2425         struct usb_power_delivery_capabilities *cap;
2426
2427         if (!port->partner_pd)
2428                 port->partner_pd = usb_power_delivery_register(NULL, &desc);
2429         if (IS_ERR(port->partner_pd))
2430                 return PTR_ERR(port->partner_pd);
2431
2432         memcpy(caps.pdo, port->sink_caps, sizeof(u32) * port->nr_sink_caps);
2433         caps.role = TYPEC_SINK;
2434
2435         cap = usb_power_delivery_register_capabilities(port->partner_pd, &caps);
2436         if (IS_ERR(cap))
2437                 return PTR_ERR(cap);
2438
2439         port->partner_sink_caps = cap;
2440
2441         return 0;
2442 }
2443
2444 static void tcpm_pd_data_request(struct tcpm_port *port,
2445                                  const struct pd_message *msg)
2446 {
2447         enum pd_data_msg_type type = pd_header_type_le(msg->header);
2448         unsigned int cnt = pd_header_cnt_le(msg->header);
2449         unsigned int rev = pd_header_rev_le(msg->header);
2450         unsigned int i;
2451         enum frs_typec_current partner_frs_current;
2452         bool frs_enable;
2453         int ret;
2454
2455         if (tcpm_vdm_ams(port) && type != PD_DATA_VENDOR_DEF) {
2456                 port->vdm_state = VDM_STATE_ERR_BUSY;
2457                 tcpm_ams_finish(port);
2458                 mod_vdm_delayed_work(port, 0);
2459         }
2460
2461         switch (type) {
2462         case PD_DATA_SOURCE_CAP:
2463                 for (i = 0; i < cnt; i++)
2464                         port->source_caps[i] = le32_to_cpu(msg->payload[i]);
2465
2466                 port->nr_source_caps = cnt;
2467
2468                 tcpm_log_source_caps(port);
2469
2470                 tcpm_validate_caps(port, port->source_caps,
2471                                    port->nr_source_caps);
2472
2473                 tcpm_register_source_caps(port);
2474
2475                 /*
2476                  * Adjust revision in subsequent message headers, as required,
2477                  * to comply with 6.2.1.1.5 of the USB PD 3.0 spec. We don't
2478                  * support Rev 1.0 so just do nothing in that scenario.
2479                  */
2480                 if (rev == PD_REV10) {
2481                         if (port->ams == GET_SOURCE_CAPABILITIES)
2482                                 tcpm_ams_finish(port);
2483                         break;
2484                 }
2485
2486                 if (rev < PD_MAX_REV)
2487                         port->negotiated_rev = rev;
2488
2489                 if (port->pwr_role == TYPEC_SOURCE) {
2490                         if (port->ams == GET_SOURCE_CAPABILITIES)
2491                                 tcpm_pd_handle_state(port, SRC_READY, NONE_AMS, 0);
2492                         /* Unexpected Source Capabilities */
2493                         else
2494                                 tcpm_pd_handle_msg(port,
2495                                                    port->negotiated_rev < PD_REV30 ?
2496                                                    PD_MSG_CTRL_REJECT :
2497                                                    PD_MSG_CTRL_NOT_SUPP,
2498                                                    NONE_AMS);
2499                 } else if (port->state == SNK_WAIT_CAPABILITIES) {
2500                 /*
2501                  * This message may be received even if VBUS is not
2502                  * present. This is quite unexpected; see USB PD
2503                  * specification, sections 8.3.3.6.3.1 and 8.3.3.6.3.2.
2504                  * However, at the same time, we must be ready to
2505                  * receive this message and respond to it 15ms after
2506                  * receiving PS_RDY during power swap operations, no matter
2507                  * if VBUS is available or not (USB PD specification,
2508                  * section 6.5.9.2).
2509                  * So we need to accept the message either way,
2510                  * but be prepared to keep waiting for VBUS after it was
2511                  * handled.
2512                  */
2513                         port->ams = POWER_NEGOTIATION;
2514                         port->in_ams = true;
2515                         tcpm_set_state(port, SNK_NEGOTIATE_CAPABILITIES, 0);
2516                 } else {
2517                         if (port->ams == GET_SOURCE_CAPABILITIES)
2518                                 tcpm_ams_finish(port);
2519                         tcpm_pd_handle_state(port, SNK_NEGOTIATE_CAPABILITIES,
2520                                              POWER_NEGOTIATION, 0);
2521                 }
2522                 break;
2523         case PD_DATA_REQUEST:
2524                 /*
2525                  * Adjust revision in subsequent message headers, as required,
2526                  * to comply with 6.2.1.1.5 of the USB PD 3.0 spec. We don't
2527                  * support Rev 1.0 so just reject in that scenario.
2528                  */
2529                 if (rev == PD_REV10) {
2530                         tcpm_pd_handle_msg(port,
2531                                            port->negotiated_rev < PD_REV30 ?
2532                                            PD_MSG_CTRL_REJECT :
2533                                            PD_MSG_CTRL_NOT_SUPP,
2534                                            NONE_AMS);
2535                         break;
2536                 }
2537
2538                 if (rev < PD_MAX_REV)
2539                         port->negotiated_rev = rev;
2540
2541                 if (port->pwr_role != TYPEC_SOURCE || cnt != 1) {
2542                         tcpm_pd_handle_msg(port,
2543                                            port->negotiated_rev < PD_REV30 ?
2544                                            PD_MSG_CTRL_REJECT :
2545                                            PD_MSG_CTRL_NOT_SUPP,
2546                                            NONE_AMS);
2547                         break;
2548                 }
2549
2550                 port->sink_request = le32_to_cpu(msg->payload[0]);
2551
2552                 if (port->vdm_sm_running && port->explicit_contract) {
2553                         tcpm_pd_handle_msg(port, PD_MSG_CTRL_WAIT, port->ams);
2554                         break;
2555                 }
2556
2557                 if (port->state == SRC_SEND_CAPABILITIES)
2558                         tcpm_set_state(port, SRC_NEGOTIATE_CAPABILITIES, 0);
2559                 else
2560                         tcpm_pd_handle_state(port, SRC_NEGOTIATE_CAPABILITIES,
2561                                              POWER_NEGOTIATION, 0);
2562                 break;
2563         case PD_DATA_SINK_CAP:
2564                 /* We don't do anything with this at the moment... */
2565                 for (i = 0; i < cnt; i++)
2566                         port->sink_caps[i] = le32_to_cpu(msg->payload[i]);
2567
2568                 partner_frs_current = (port->sink_caps[0] & PDO_FIXED_FRS_CURR_MASK) >>
2569                         PDO_FIXED_FRS_CURR_SHIFT;
2570                 frs_enable = partner_frs_current && (partner_frs_current <=
2571                                                      port->new_source_frs_current);
2572                 tcpm_log(port,
2573                          "Port partner FRS capable partner_frs_current:%u port_frs_current:%u enable:%c",
2574                          partner_frs_current, port->new_source_frs_current, frs_enable ? 'y' : 'n');
2575                 if (frs_enable) {
2576                         ret  = port->tcpc->enable_frs(port->tcpc, true);
2577                         tcpm_log(port, "Enable FRS %s, ret:%d\n", ret ? "fail" : "success", ret);
2578                 }
2579
2580                 port->nr_sink_caps = cnt;
2581                 port->sink_cap_done = true;
2582                 tcpm_register_sink_caps(port);
2583
2584                 if (port->ams == GET_SINK_CAPABILITIES)
2585                         tcpm_set_state(port, ready_state(port), 0);
2586                 /* Unexpected Sink Capabilities */
2587                 else
2588                         tcpm_pd_handle_msg(port,
2589                                            port->negotiated_rev < PD_REV30 ?
2590                                            PD_MSG_CTRL_REJECT :
2591                                            PD_MSG_CTRL_NOT_SUPP,
2592                                            NONE_AMS);
2593                 break;
2594         case PD_DATA_VENDOR_DEF:
2595                 tcpm_handle_vdm_request(port, msg->payload, cnt);
2596                 break;
2597         case PD_DATA_BIST:
2598                 port->bist_request = le32_to_cpu(msg->payload[0]);
2599                 tcpm_pd_handle_state(port, BIST_RX, BIST, 0);
2600                 break;
2601         case PD_DATA_ALERT:
2602                 if (port->state != SRC_READY && port->state != SNK_READY)
2603                         tcpm_pd_handle_state(port, port->pwr_role == TYPEC_SOURCE ?
2604                                              SRC_SOFT_RESET_WAIT_SNK_TX : SNK_SOFT_RESET,
2605                                              NONE_AMS, 0);
2606                 else
2607                         tcpm_handle_alert(port, msg->payload, cnt);
2608                 break;
2609         case PD_DATA_BATT_STATUS:
2610         case PD_DATA_GET_COUNTRY_INFO:
2611                 /* Currently unsupported */
2612                 tcpm_pd_handle_msg(port, port->negotiated_rev < PD_REV30 ?
2613                                    PD_MSG_CTRL_REJECT :
2614                                    PD_MSG_CTRL_NOT_SUPP,
2615                                    NONE_AMS);
2616                 break;
2617         default:
2618                 tcpm_pd_handle_msg(port, port->negotiated_rev < PD_REV30 ?
2619                                    PD_MSG_CTRL_REJECT :
2620                                    PD_MSG_CTRL_NOT_SUPP,
2621                                    NONE_AMS);
2622                 tcpm_log(port, "Unrecognized data message type %#x", type);
2623                 break;
2624         }
2625 }
2626
2627 static void tcpm_pps_complete(struct tcpm_port *port, int result)
2628 {
2629         if (port->pps_pending) {
2630                 port->pps_status = result;
2631                 port->pps_pending = false;
2632                 complete(&port->pps_complete);
2633         }
2634 }
2635
2636 static void tcpm_pd_ctrl_request(struct tcpm_port *port,
2637                                  const struct pd_message *msg)
2638 {
2639         enum pd_ctrl_msg_type type = pd_header_type_le(msg->header);
2640         enum tcpm_state next_state;
2641
2642         /*
2643          * Stop VDM state machine if interrupted by other Messages while NOT_SUPP is allowed in
2644          * VDM AMS if waiting for VDM responses and will be handled later.
2645          */
2646         if (tcpm_vdm_ams(port) && type != PD_CTRL_NOT_SUPP && type != PD_CTRL_GOOD_CRC) {
2647                 port->vdm_state = VDM_STATE_ERR_BUSY;
2648                 tcpm_ams_finish(port);
2649                 mod_vdm_delayed_work(port, 0);
2650         }
2651
2652         switch (type) {
2653         case PD_CTRL_GOOD_CRC:
2654         case PD_CTRL_PING:
2655                 break;
2656         case PD_CTRL_GET_SOURCE_CAP:
2657                 tcpm_pd_handle_msg(port, PD_MSG_DATA_SOURCE_CAP, GET_SOURCE_CAPABILITIES);
2658                 break;
2659         case PD_CTRL_GET_SINK_CAP:
2660                 tcpm_pd_handle_msg(port, PD_MSG_DATA_SINK_CAP, GET_SINK_CAPABILITIES);
2661                 break;
2662         case PD_CTRL_GOTO_MIN:
2663                 break;
2664         case PD_CTRL_PS_RDY:
2665                 switch (port->state) {
2666                 case SNK_TRANSITION_SINK:
2667                         if (port->vbus_present) {
2668                                 tcpm_set_current_limit(port,
2669                                                        port->req_current_limit,
2670                                                        port->req_supply_voltage);
2671                                 port->explicit_contract = true;
2672                                 tcpm_set_auto_vbus_discharge_threshold(port,
2673                                                                        TYPEC_PWR_MODE_PD,
2674                                                                        port->pps_data.active,
2675                                                                        port->supply_voltage);
2676                                 tcpm_set_state(port, SNK_READY, 0);
2677                         } else {
2678                                 /*
2679                                  * Seen after power swap. Keep waiting for VBUS
2680                                  * in a transitional state.
2681                                  */
2682                                 tcpm_set_state(port,
2683                                                SNK_TRANSITION_SINK_VBUS, 0);
2684                         }
2685                         break;
2686                 case PR_SWAP_SRC_SNK_SOURCE_OFF_CC_DEBOUNCED:
2687                         tcpm_set_state(port, PR_SWAP_SRC_SNK_SINK_ON, 0);
2688                         break;
2689                 case PR_SWAP_SNK_SRC_SINK_OFF:
2690                         tcpm_set_state(port, PR_SWAP_SNK_SRC_SOURCE_ON, 0);
2691                         break;
2692                 case VCONN_SWAP_WAIT_FOR_VCONN:
2693                         tcpm_set_state(port, VCONN_SWAP_TURN_OFF_VCONN, 0);
2694                         break;
2695                 case FR_SWAP_SNK_SRC_TRANSITION_TO_OFF:
2696                         tcpm_set_state(port, FR_SWAP_SNK_SRC_NEW_SINK_READY, 0);
2697                         break;
2698                 default:
2699                         tcpm_pd_handle_state(port,
2700                                              port->pwr_role == TYPEC_SOURCE ?
2701                                              SRC_SOFT_RESET_WAIT_SNK_TX :
2702                                              SNK_SOFT_RESET,
2703                                              NONE_AMS, 0);
2704                         break;
2705                 }
2706                 break;
2707         case PD_CTRL_REJECT:
2708         case PD_CTRL_WAIT:
2709         case PD_CTRL_NOT_SUPP:
2710                 switch (port->state) {
2711                 case SNK_NEGOTIATE_CAPABILITIES:
2712                         /* USB PD specification, Figure 8-43 */
2713                         if (port->explicit_contract)
2714                                 next_state = SNK_READY;
2715                         else
2716                                 next_state = SNK_WAIT_CAPABILITIES;
2717
2718                         /* Threshold was relaxed before sending Request. Restore it back. */
2719                         tcpm_set_auto_vbus_discharge_threshold(port, TYPEC_PWR_MODE_PD,
2720                                                                port->pps_data.active,
2721                                                                port->supply_voltage);
2722                         tcpm_set_state(port, next_state, 0);
2723                         break;
2724                 case SNK_NEGOTIATE_PPS_CAPABILITIES:
2725                         /* Revert data back from any requested PPS updates */
2726                         port->pps_data.req_out_volt = port->supply_voltage;
2727                         port->pps_data.req_op_curr = port->current_limit;
2728                         port->pps_status = (type == PD_CTRL_WAIT ?
2729                                             -EAGAIN : -EOPNOTSUPP);
2730
2731                         /* Threshold was relaxed before sending Request. Restore it back. */
2732                         tcpm_set_auto_vbus_discharge_threshold(port, TYPEC_PWR_MODE_PD,
2733                                                                port->pps_data.active,
2734                                                                port->supply_voltage);
2735
2736                         tcpm_set_state(port, SNK_READY, 0);
2737                         break;
2738                 case DR_SWAP_SEND:
2739                         port->swap_status = (type == PD_CTRL_WAIT ?
2740                                              -EAGAIN : -EOPNOTSUPP);
2741                         tcpm_set_state(port, DR_SWAP_CANCEL, 0);
2742                         break;
2743                 case PR_SWAP_SEND:
2744                         port->swap_status = (type == PD_CTRL_WAIT ?
2745                                              -EAGAIN : -EOPNOTSUPP);
2746                         tcpm_set_state(port, PR_SWAP_CANCEL, 0);
2747                         break;
2748                 case VCONN_SWAP_SEND:
2749                         port->swap_status = (type == PD_CTRL_WAIT ?
2750                                              -EAGAIN : -EOPNOTSUPP);
2751                         tcpm_set_state(port, VCONN_SWAP_CANCEL, 0);
2752                         break;
2753                 case FR_SWAP_SEND:
2754                         tcpm_set_state(port, FR_SWAP_CANCEL, 0);
2755                         break;
2756                 case GET_SINK_CAP:
2757                         port->sink_cap_done = true;
2758                         tcpm_set_state(port, ready_state(port), 0);
2759                         break;
2760                 /*
2761                  * Some port partners do not support GET_STATUS, avoid soft reset the link to
2762                  * prevent redundant power re-negotiation
2763                  */
2764                 case GET_STATUS_SEND:
2765                         tcpm_set_state(port, ready_state(port), 0);
2766                         break;
2767                 case SRC_READY:
2768                 case SNK_READY:
2769                         if (port->vdm_state > VDM_STATE_READY) {
2770                                 port->vdm_state = VDM_STATE_DONE;
2771                                 if (tcpm_vdm_ams(port))
2772                                         tcpm_ams_finish(port);
2773                                 mod_vdm_delayed_work(port, 0);
2774                                 break;
2775                         }
2776                         fallthrough;
2777                 default:
2778                         tcpm_pd_handle_state(port,
2779                                              port->pwr_role == TYPEC_SOURCE ?
2780                                              SRC_SOFT_RESET_WAIT_SNK_TX :
2781                                              SNK_SOFT_RESET,
2782                                              NONE_AMS, 0);
2783                         break;
2784                 }
2785                 break;
2786         case PD_CTRL_ACCEPT:
2787                 switch (port->state) {
2788                 case SNK_NEGOTIATE_CAPABILITIES:
2789                         port->pps_data.active = false;
2790                         tcpm_set_state(port, SNK_TRANSITION_SINK, 0);
2791                         break;
2792                 case SNK_NEGOTIATE_PPS_CAPABILITIES:
2793                         port->pps_data.active = true;
2794                         port->pps_data.min_volt = port->pps_data.req_min_volt;
2795                         port->pps_data.max_volt = port->pps_data.req_max_volt;
2796                         port->pps_data.max_curr = port->pps_data.req_max_curr;
2797                         port->req_supply_voltage = port->pps_data.req_out_volt;
2798                         port->req_current_limit = port->pps_data.req_op_curr;
2799                         power_supply_changed(port->psy);
2800                         tcpm_set_state(port, SNK_TRANSITION_SINK, 0);
2801                         break;
2802                 case SOFT_RESET_SEND:
2803                         if (port->ams == SOFT_RESET_AMS)
2804                                 tcpm_ams_finish(port);
2805                         if (port->pwr_role == TYPEC_SOURCE) {
2806                                 port->upcoming_state = SRC_SEND_CAPABILITIES;
2807                                 tcpm_ams_start(port, POWER_NEGOTIATION);
2808                         } else {
2809                                 tcpm_set_state(port, SNK_WAIT_CAPABILITIES, 0);
2810                         }
2811                         break;
2812                 case DR_SWAP_SEND:
2813                         tcpm_set_state(port, DR_SWAP_CHANGE_DR, 0);
2814                         break;
2815                 case PR_SWAP_SEND:
2816                         tcpm_set_state(port, PR_SWAP_START, 0);
2817                         break;
2818                 case VCONN_SWAP_SEND:
2819                         tcpm_set_state(port, VCONN_SWAP_START, 0);
2820                         break;
2821                 case FR_SWAP_SEND:
2822                         tcpm_set_state(port, FR_SWAP_SNK_SRC_TRANSITION_TO_OFF, 0);
2823                         break;
2824                 default:
2825                         tcpm_pd_handle_state(port,
2826                                              port->pwr_role == TYPEC_SOURCE ?
2827                                              SRC_SOFT_RESET_WAIT_SNK_TX :
2828                                              SNK_SOFT_RESET,
2829                                              NONE_AMS, 0);
2830                         break;
2831                 }
2832                 break;
2833         case PD_CTRL_SOFT_RESET:
2834                 port->ams = SOFT_RESET_AMS;
2835                 tcpm_set_state(port, SOFT_RESET, 0);
2836                 break;
2837         case PD_CTRL_DR_SWAP:
2838                 /*
2839                  * XXX
2840                  * 6.3.9: If an alternate mode is active, a request to swap
2841                  * alternate modes shall trigger a port reset.
2842                  */
2843                 if (port->typec_caps.data != TYPEC_PORT_DRD) {
2844                         tcpm_pd_handle_msg(port,
2845                                            port->negotiated_rev < PD_REV30 ?
2846                                            PD_MSG_CTRL_REJECT :
2847                                            PD_MSG_CTRL_NOT_SUPP,
2848                                            NONE_AMS);
2849                 } else {
2850                         if (port->send_discover) {
2851                                 tcpm_queue_message(port, PD_MSG_CTRL_WAIT);
2852                                 break;
2853                         }
2854
2855                         tcpm_pd_handle_state(port, DR_SWAP_ACCEPT, DATA_ROLE_SWAP, 0);
2856                 }
2857                 break;
2858         case PD_CTRL_PR_SWAP:
2859                 if (port->port_type != TYPEC_PORT_DRP) {
2860                         tcpm_pd_handle_msg(port,
2861                                            port->negotiated_rev < PD_REV30 ?
2862                                            PD_MSG_CTRL_REJECT :
2863                                            PD_MSG_CTRL_NOT_SUPP,
2864                                            NONE_AMS);
2865                 } else {
2866                         if (port->send_discover) {
2867                                 tcpm_queue_message(port, PD_MSG_CTRL_WAIT);
2868                                 break;
2869                         }
2870
2871                         tcpm_pd_handle_state(port, PR_SWAP_ACCEPT, POWER_ROLE_SWAP, 0);
2872                 }
2873                 break;
2874         case PD_CTRL_VCONN_SWAP:
2875                 if (port->send_discover) {
2876                         tcpm_queue_message(port, PD_MSG_CTRL_WAIT);
2877                         break;
2878                 }
2879
2880                 tcpm_pd_handle_state(port, VCONN_SWAP_ACCEPT, VCONN_SWAP, 0);
2881                 break;
2882         case PD_CTRL_GET_SOURCE_CAP_EXT:
2883         case PD_CTRL_GET_STATUS:
2884         case PD_CTRL_FR_SWAP:
2885         case PD_CTRL_GET_PPS_STATUS:
2886         case PD_CTRL_GET_COUNTRY_CODES:
2887                 /* Currently not supported */
2888                 tcpm_pd_handle_msg(port,
2889                                    port->negotiated_rev < PD_REV30 ?
2890                                    PD_MSG_CTRL_REJECT :
2891                                    PD_MSG_CTRL_NOT_SUPP,
2892                                    NONE_AMS);
2893                 break;
2894         default:
2895                 tcpm_pd_handle_msg(port,
2896                                    port->negotiated_rev < PD_REV30 ?
2897                                    PD_MSG_CTRL_REJECT :
2898                                    PD_MSG_CTRL_NOT_SUPP,
2899                                    NONE_AMS);
2900                 tcpm_log(port, "Unrecognized ctrl message type %#x", type);
2901                 break;
2902         }
2903 }
2904
2905 static void tcpm_pd_ext_msg_request(struct tcpm_port *port,
2906                                     const struct pd_message *msg)
2907 {
2908         enum pd_ext_msg_type type = pd_header_type_le(msg->header);
2909         unsigned int data_size = pd_ext_header_data_size_le(msg->ext_msg.header);
2910
2911         /* stopping VDM state machine if interrupted by other Messages */
2912         if (tcpm_vdm_ams(port)) {
2913                 port->vdm_state = VDM_STATE_ERR_BUSY;
2914                 tcpm_ams_finish(port);
2915                 mod_vdm_delayed_work(port, 0);
2916         }
2917
2918         if (!(le16_to_cpu(msg->ext_msg.header) & PD_EXT_HDR_CHUNKED)) {
2919                 tcpm_pd_handle_msg(port, PD_MSG_CTRL_NOT_SUPP, NONE_AMS);
2920                 tcpm_log(port, "Unchunked extended messages unsupported");
2921                 return;
2922         }
2923
2924         if (data_size > PD_EXT_MAX_CHUNK_DATA) {
2925                 tcpm_pd_handle_state(port, CHUNK_NOT_SUPP, NONE_AMS, PD_T_CHUNK_NOT_SUPP);
2926                 tcpm_log(port, "Chunk handling not yet supported");
2927                 return;
2928         }
2929
2930         switch (type) {
2931         case PD_EXT_STATUS:
2932         case PD_EXT_PPS_STATUS:
2933                 if (port->ams == GETTING_SOURCE_SINK_STATUS) {
2934                         tcpm_ams_finish(port);
2935                         tcpm_set_state(port, ready_state(port), 0);
2936                 } else {
2937                         /* unexpected Status or PPS_Status Message */
2938                         tcpm_pd_handle_state(port, port->pwr_role == TYPEC_SOURCE ?
2939                                              SRC_SOFT_RESET_WAIT_SNK_TX : SNK_SOFT_RESET,
2940                                              NONE_AMS, 0);
2941                 }
2942                 break;
2943         case PD_EXT_SOURCE_CAP_EXT:
2944         case PD_EXT_GET_BATT_CAP:
2945         case PD_EXT_GET_BATT_STATUS:
2946         case PD_EXT_BATT_CAP:
2947         case PD_EXT_GET_MANUFACTURER_INFO:
2948         case PD_EXT_MANUFACTURER_INFO:
2949         case PD_EXT_SECURITY_REQUEST:
2950         case PD_EXT_SECURITY_RESPONSE:
2951         case PD_EXT_FW_UPDATE_REQUEST:
2952         case PD_EXT_FW_UPDATE_RESPONSE:
2953         case PD_EXT_COUNTRY_INFO:
2954         case PD_EXT_COUNTRY_CODES:
2955                 tcpm_pd_handle_msg(port, PD_MSG_CTRL_NOT_SUPP, NONE_AMS);
2956                 break;
2957         default:
2958                 tcpm_pd_handle_msg(port, PD_MSG_CTRL_NOT_SUPP, NONE_AMS);
2959                 tcpm_log(port, "Unrecognized extended message type %#x", type);
2960                 break;
2961         }
2962 }
2963
2964 static void tcpm_pd_rx_handler(struct kthread_work *work)
2965 {
2966         struct pd_rx_event *event = container_of(work,
2967                                                  struct pd_rx_event, work);
2968         const struct pd_message *msg = &event->msg;
2969         unsigned int cnt = pd_header_cnt_le(msg->header);
2970         struct tcpm_port *port = event->port;
2971
2972         mutex_lock(&port->lock);
2973
2974         tcpm_log(port, "PD RX, header: %#x [%d]", le16_to_cpu(msg->header),
2975                  port->attached);
2976
2977         if (port->attached) {
2978                 enum pd_ctrl_msg_type type = pd_header_type_le(msg->header);
2979                 unsigned int msgid = pd_header_msgid_le(msg->header);
2980
2981                 /*
2982                  * USB PD standard, 6.6.1.2:
2983                  * "... if MessageID value in a received Message is the
2984                  * same as the stored value, the receiver shall return a
2985                  * GoodCRC Message with that MessageID value and drop
2986                  * the Message (this is a retry of an already received
2987                  * Message). Note: this shall not apply to the Soft_Reset
2988                  * Message which always has a MessageID value of zero."
2989                  */
2990                 if (msgid == port->rx_msgid && type != PD_CTRL_SOFT_RESET)
2991                         goto done;
2992                 port->rx_msgid = msgid;
2993
2994                 /*
2995                  * If both ends believe to be DFP/host, we have a data role
2996                  * mismatch.
2997                  */
2998                 if (!!(le16_to_cpu(msg->header) & PD_HEADER_DATA_ROLE) ==
2999                     (port->data_role == TYPEC_HOST)) {
3000                         tcpm_log(port,
3001                                  "Data role mismatch, initiating error recovery");
3002                         tcpm_set_state(port, ERROR_RECOVERY, 0);
3003                 } else {
3004                         if (le16_to_cpu(msg->header) & PD_HEADER_EXT_HDR)
3005                                 tcpm_pd_ext_msg_request(port, msg);
3006                         else if (cnt)
3007                                 tcpm_pd_data_request(port, msg);
3008                         else
3009                                 tcpm_pd_ctrl_request(port, msg);
3010                 }
3011         }
3012
3013 done:
3014         mutex_unlock(&port->lock);
3015         kfree(event);
3016 }
3017
3018 void tcpm_pd_receive(struct tcpm_port *port, const struct pd_message *msg)
3019 {
3020         struct pd_rx_event *event;
3021
3022         event = kzalloc(sizeof(*event), GFP_ATOMIC);
3023         if (!event)
3024                 return;
3025
3026         kthread_init_work(&event->work, tcpm_pd_rx_handler);
3027         event->port = port;
3028         memcpy(&event->msg, msg, sizeof(*msg));
3029         kthread_queue_work(port->wq, &event->work);
3030 }
3031 EXPORT_SYMBOL_GPL(tcpm_pd_receive);
3032
3033 static int tcpm_pd_send_control(struct tcpm_port *port,
3034                                 enum pd_ctrl_msg_type type)
3035 {
3036         struct pd_message msg;
3037
3038         memset(&msg, 0, sizeof(msg));
3039         msg.header = PD_HEADER_LE(type, port->pwr_role,
3040                                   port->data_role,
3041                                   port->negotiated_rev,
3042                                   port->message_id, 0);
3043
3044         return tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
3045 }
3046
3047 /*
3048  * Send queued message without affecting state.
3049  * Return true if state machine should go back to sleep,
3050  * false otherwise.
3051  */
3052 static bool tcpm_send_queued_message(struct tcpm_port *port)
3053 {
3054         enum pd_msg_request queued_message;
3055         int ret;
3056
3057         do {
3058                 queued_message = port->queued_message;
3059                 port->queued_message = PD_MSG_NONE;
3060
3061                 switch (queued_message) {
3062                 case PD_MSG_CTRL_WAIT:
3063                         tcpm_pd_send_control(port, PD_CTRL_WAIT);
3064                         break;
3065                 case PD_MSG_CTRL_REJECT:
3066                         tcpm_pd_send_control(port, PD_CTRL_REJECT);
3067                         break;
3068                 case PD_MSG_CTRL_NOT_SUPP:
3069                         tcpm_pd_send_control(port, PD_CTRL_NOT_SUPP);
3070                         break;
3071                 case PD_MSG_DATA_SINK_CAP:
3072                         ret = tcpm_pd_send_sink_caps(port);
3073                         if (ret < 0) {
3074                                 tcpm_log(port, "Unable to send snk caps, ret=%d", ret);
3075                                 tcpm_set_state(port, SNK_SOFT_RESET, 0);
3076                         }
3077                         tcpm_ams_finish(port);
3078                         break;
3079                 case PD_MSG_DATA_SOURCE_CAP:
3080                         ret = tcpm_pd_send_source_caps(port);
3081                         if (ret < 0) {
3082                                 tcpm_log(port,
3083                                          "Unable to send src caps, ret=%d",
3084                                          ret);
3085                                 tcpm_set_state(port, SOFT_RESET_SEND, 0);
3086                         } else if (port->pwr_role == TYPEC_SOURCE) {
3087                                 tcpm_ams_finish(port);
3088                                 tcpm_set_state(port, HARD_RESET_SEND,
3089                                                PD_T_SENDER_RESPONSE);
3090                         } else {
3091                                 tcpm_ams_finish(port);
3092                         }
3093                         break;
3094                 default:
3095                         break;
3096                 }
3097         } while (port->queued_message != PD_MSG_NONE);
3098
3099         if (port->delayed_state != INVALID_STATE) {
3100                 if (ktime_after(port->delayed_runtime, ktime_get())) {
3101                         mod_tcpm_delayed_work(port, ktime_to_ms(ktime_sub(port->delayed_runtime,
3102                                                                           ktime_get())));
3103                         return true;
3104                 }
3105                 port->delayed_state = INVALID_STATE;
3106         }
3107         return false;
3108 }
3109
3110 static int tcpm_pd_check_request(struct tcpm_port *port)
3111 {
3112         u32 pdo, rdo = port->sink_request;
3113         unsigned int max, op, pdo_max, index;
3114         enum pd_pdo_type type;
3115
3116         index = rdo_index(rdo);
3117         if (!index || index > port->nr_src_pdo)
3118                 return -EINVAL;
3119
3120         pdo = port->src_pdo[index - 1];
3121         type = pdo_type(pdo);
3122         switch (type) {
3123         case PDO_TYPE_FIXED:
3124         case PDO_TYPE_VAR:
3125                 max = rdo_max_current(rdo);
3126                 op = rdo_op_current(rdo);
3127                 pdo_max = pdo_max_current(pdo);
3128
3129                 if (op > pdo_max)
3130                         return -EINVAL;
3131                 if (max > pdo_max && !(rdo & RDO_CAP_MISMATCH))
3132                         return -EINVAL;
3133
3134                 if (type == PDO_TYPE_FIXED)
3135                         tcpm_log(port,
3136                                  "Requested %u mV, %u mA for %u / %u mA",
3137                                  pdo_fixed_voltage(pdo), pdo_max, op, max);
3138                 else
3139                         tcpm_log(port,
3140                                  "Requested %u -> %u mV, %u mA for %u / %u mA",
3141                                  pdo_min_voltage(pdo), pdo_max_voltage(pdo),
3142                                  pdo_max, op, max);
3143                 break;
3144         case PDO_TYPE_BATT:
3145                 max = rdo_max_power(rdo);
3146                 op = rdo_op_power(rdo);
3147                 pdo_max = pdo_max_power(pdo);
3148
3149                 if (op > pdo_max)
3150                         return -EINVAL;
3151                 if (max > pdo_max && !(rdo & RDO_CAP_MISMATCH))
3152                         return -EINVAL;
3153                 tcpm_log(port,
3154                          "Requested %u -> %u mV, %u mW for %u / %u mW",
3155                          pdo_min_voltage(pdo), pdo_max_voltage(pdo),
3156                          pdo_max, op, max);
3157                 break;
3158         default:
3159                 return -EINVAL;
3160         }
3161
3162         port->op_vsafe5v = index == 1;
3163
3164         return 0;
3165 }
3166
3167 #define min_power(x, y) min(pdo_max_power(x), pdo_max_power(y))
3168 #define min_current(x, y) min(pdo_max_current(x), pdo_max_current(y))
3169
3170 static int tcpm_pd_select_pdo(struct tcpm_port *port, int *sink_pdo,
3171                               int *src_pdo)
3172 {
3173         unsigned int i, j, max_src_mv = 0, min_src_mv = 0, max_mw = 0,
3174                      max_mv = 0, src_mw = 0, src_ma = 0, max_snk_mv = 0,
3175                      min_snk_mv = 0;
3176         int ret = -EINVAL;
3177
3178         port->pps_data.supported = false;
3179         port->usb_type = POWER_SUPPLY_USB_TYPE_PD;
3180         power_supply_changed(port->psy);
3181
3182         /*
3183          * Select the source PDO providing the most power which has a
3184          * matchig sink cap.
3185          */
3186         for (i = 0; i < port->nr_source_caps; i++) {
3187                 u32 pdo = port->source_caps[i];
3188                 enum pd_pdo_type type = pdo_type(pdo);
3189
3190                 switch (type) {
3191                 case PDO_TYPE_FIXED:
3192                         max_src_mv = pdo_fixed_voltage(pdo);
3193                         min_src_mv = max_src_mv;
3194                         break;
3195                 case PDO_TYPE_BATT:
3196                 case PDO_TYPE_VAR:
3197                         max_src_mv = pdo_max_voltage(pdo);
3198                         min_src_mv = pdo_min_voltage(pdo);
3199                         break;
3200                 case PDO_TYPE_APDO:
3201                         if (pdo_apdo_type(pdo) == APDO_TYPE_PPS) {
3202                                 port->pps_data.supported = true;
3203                                 port->usb_type =
3204                                         POWER_SUPPLY_USB_TYPE_PD_PPS;
3205                                 power_supply_changed(port->psy);
3206                         }
3207                         continue;
3208                 default:
3209                         tcpm_log(port, "Invalid source PDO type, ignoring");
3210                         continue;
3211                 }
3212
3213                 switch (type) {
3214                 case PDO_TYPE_FIXED:
3215                 case PDO_TYPE_VAR:
3216                         src_ma = pdo_max_current(pdo);
3217                         src_mw = src_ma * min_src_mv / 1000;
3218                         break;
3219                 case PDO_TYPE_BATT:
3220                         src_mw = pdo_max_power(pdo);
3221                         break;
3222                 case PDO_TYPE_APDO:
3223                         continue;
3224                 default:
3225                         tcpm_log(port, "Invalid source PDO type, ignoring");
3226                         continue;
3227                 }
3228
3229                 for (j = 0; j < port->nr_snk_pdo; j++) {
3230                         pdo = port->snk_pdo[j];
3231
3232                         switch (pdo_type(pdo)) {
3233                         case PDO_TYPE_FIXED:
3234                                 max_snk_mv = pdo_fixed_voltage(pdo);
3235                                 min_snk_mv = max_snk_mv;
3236                                 break;
3237                         case PDO_TYPE_BATT:
3238                         case PDO_TYPE_VAR:
3239                                 max_snk_mv = pdo_max_voltage(pdo);
3240                                 min_snk_mv = pdo_min_voltage(pdo);
3241                                 break;
3242                         case PDO_TYPE_APDO:
3243                                 continue;
3244                         default:
3245                                 tcpm_log(port, "Invalid sink PDO type, ignoring");
3246                                 continue;
3247                         }
3248
3249                         if (max_src_mv <= max_snk_mv &&
3250                                 min_src_mv >= min_snk_mv) {
3251                                 /* Prefer higher voltages if available */
3252                                 if ((src_mw == max_mw && min_src_mv > max_mv) ||
3253                                                         src_mw > max_mw) {
3254                                         *src_pdo = i;
3255                                         *sink_pdo = j;
3256                                         max_mw = src_mw;
3257                                         max_mv = min_src_mv;
3258                                         ret = 0;
3259                                 }
3260                         }
3261                 }
3262         }
3263
3264         return ret;
3265 }
3266
3267 static unsigned int tcpm_pd_select_pps_apdo(struct tcpm_port *port)
3268 {
3269         unsigned int i, src_ma, max_temp_mw = 0, max_op_ma, op_mw;
3270         unsigned int src_pdo = 0;
3271         u32 pdo, src;
3272
3273         for (i = 1; i < port->nr_source_caps; ++i) {
3274                 pdo = port->source_caps[i];
3275
3276                 switch (pdo_type(pdo)) {
3277                 case PDO_TYPE_APDO:
3278                         if (pdo_apdo_type(pdo) != APDO_TYPE_PPS) {
3279                                 tcpm_log(port, "Not PPS APDO (source), ignoring");
3280                                 continue;
3281                         }
3282
3283                         if (port->pps_data.req_out_volt > pdo_pps_apdo_max_voltage(pdo) ||
3284                             port->pps_data.req_out_volt < pdo_pps_apdo_min_voltage(pdo))
3285                                 continue;
3286
3287                         src_ma = pdo_pps_apdo_max_current(pdo);
3288                         max_op_ma = min(src_ma, port->pps_data.req_op_curr);
3289                         op_mw = max_op_ma * port->pps_data.req_out_volt / 1000;
3290                         if (op_mw > max_temp_mw) {
3291                                 src_pdo = i;
3292                                 max_temp_mw = op_mw;
3293                         }
3294                         break;
3295                 default:
3296                         tcpm_log(port, "Not APDO type (source), ignoring");
3297                         continue;
3298                 }
3299         }
3300
3301         if (src_pdo) {
3302                 src = port->source_caps[src_pdo];
3303
3304                 port->pps_data.req_min_volt = pdo_pps_apdo_min_voltage(src);
3305                 port->pps_data.req_max_volt = pdo_pps_apdo_max_voltage(src);
3306                 port->pps_data.req_max_curr = pdo_pps_apdo_max_current(src);
3307                 port->pps_data.req_op_curr = min(port->pps_data.req_max_curr,
3308                                                  port->pps_data.req_op_curr);
3309         }
3310
3311         return src_pdo;
3312 }
3313
3314 static int tcpm_pd_build_request(struct tcpm_port *port, u32 *rdo)
3315 {
3316         unsigned int mv, ma, mw, flags;
3317         unsigned int max_ma, max_mw;
3318         enum pd_pdo_type type;
3319         u32 pdo, matching_snk_pdo;
3320         int src_pdo_index = 0;
3321         int snk_pdo_index = 0;
3322         int ret;
3323
3324         ret = tcpm_pd_select_pdo(port, &snk_pdo_index, &src_pdo_index);
3325         if (ret < 0)
3326                 return ret;
3327
3328         pdo = port->source_caps[src_pdo_index];
3329         matching_snk_pdo = port->snk_pdo[snk_pdo_index];
3330         type = pdo_type(pdo);
3331
3332         switch (type) {
3333         case PDO_TYPE_FIXED:
3334                 mv = pdo_fixed_voltage(pdo);
3335                 break;
3336         case PDO_TYPE_BATT:
3337         case PDO_TYPE_VAR:
3338                 mv = pdo_min_voltage(pdo);
3339                 break;
3340         default:
3341                 tcpm_log(port, "Invalid PDO selected!");
3342                 return -EINVAL;
3343         }
3344
3345         /* Select maximum available current within the sink pdo's limit */
3346         if (type == PDO_TYPE_BATT) {
3347                 mw = min_power(pdo, matching_snk_pdo);
3348                 ma = 1000 * mw / mv;
3349         } else {
3350                 ma = min_current(pdo, matching_snk_pdo);
3351                 mw = ma * mv / 1000;
3352         }
3353
3354         flags = RDO_USB_COMM | RDO_NO_SUSPEND;
3355
3356         /* Set mismatch bit if offered power is less than operating power */
3357         max_ma = ma;
3358         max_mw = mw;
3359         if (mw < port->operating_snk_mw) {
3360                 flags |= RDO_CAP_MISMATCH;
3361                 if (type == PDO_TYPE_BATT &&
3362                     (pdo_max_power(matching_snk_pdo) > pdo_max_power(pdo)))
3363                         max_mw = pdo_max_power(matching_snk_pdo);
3364                 else if (pdo_max_current(matching_snk_pdo) >
3365                          pdo_max_current(pdo))
3366                         max_ma = pdo_max_current(matching_snk_pdo);
3367         }
3368
3369         tcpm_log(port, "cc=%d cc1=%d cc2=%d vbus=%d vconn=%s polarity=%d",
3370                  port->cc_req, port->cc1, port->cc2, port->vbus_source,
3371                  port->vconn_role == TYPEC_SOURCE ? "source" : "sink",
3372                  port->polarity);
3373
3374         if (type == PDO_TYPE_BATT) {
3375                 *rdo = RDO_BATT(src_pdo_index + 1, mw, max_mw, flags);
3376
3377                 tcpm_log(port, "Requesting PDO %d: %u mV, %u mW%s",
3378                          src_pdo_index, mv, mw,
3379                          flags & RDO_CAP_MISMATCH ? " [mismatch]" : "");
3380         } else {
3381                 *rdo = RDO_FIXED(src_pdo_index + 1, ma, max_ma, flags);
3382
3383                 tcpm_log(port, "Requesting PDO %d: %u mV, %u mA%s",
3384                          src_pdo_index, mv, ma,
3385                          flags & RDO_CAP_MISMATCH ? " [mismatch]" : "");
3386         }
3387
3388         port->req_current_limit = ma;
3389         port->req_supply_voltage = mv;
3390
3391         return 0;
3392 }
3393
3394 static int tcpm_pd_send_request(struct tcpm_port *port)
3395 {
3396         struct pd_message msg;
3397         int ret;
3398         u32 rdo;
3399
3400         ret = tcpm_pd_build_request(port, &rdo);
3401         if (ret < 0)
3402                 return ret;
3403
3404         /*
3405          * Relax the threshold as voltage will be adjusted after Accept Message plus tSrcTransition.
3406          * It is safer to modify the threshold here.
3407          */
3408         tcpm_set_auto_vbus_discharge_threshold(port, TYPEC_PWR_MODE_USB, false, 0);
3409
3410         memset(&msg, 0, sizeof(msg));
3411         msg.header = PD_HEADER_LE(PD_DATA_REQUEST,
3412                                   port->pwr_role,
3413                                   port->data_role,
3414                                   port->negotiated_rev,
3415                                   port->message_id, 1);
3416         msg.payload[0] = cpu_to_le32(rdo);
3417
3418         return tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
3419 }
3420
3421 static int tcpm_pd_build_pps_request(struct tcpm_port *port, u32 *rdo)
3422 {
3423         unsigned int out_mv, op_ma, op_mw, max_mv, max_ma, flags;
3424         unsigned int src_pdo_index;
3425
3426         src_pdo_index = tcpm_pd_select_pps_apdo(port);
3427         if (!src_pdo_index)
3428                 return -EOPNOTSUPP;
3429
3430         max_mv = port->pps_data.req_max_volt;
3431         max_ma = port->pps_data.req_max_curr;
3432         out_mv = port->pps_data.req_out_volt;
3433         op_ma = port->pps_data.req_op_curr;
3434
3435         flags = RDO_USB_COMM | RDO_NO_SUSPEND;
3436
3437         op_mw = (op_ma * out_mv) / 1000;
3438         if (op_mw < port->operating_snk_mw) {
3439                 /*
3440                  * Try raising current to meet power needs. If that's not enough
3441                  * then try upping the voltage. If that's still not enough
3442                  * then we've obviously chosen a PPS APDO which really isn't
3443                  * suitable so abandon ship.
3444                  */
3445                 op_ma = (port->operating_snk_mw * 1000) / out_mv;
3446                 if ((port->operating_snk_mw * 1000) % out_mv)
3447                         ++op_ma;
3448                 op_ma += RDO_PROG_CURR_MA_STEP - (op_ma % RDO_PROG_CURR_MA_STEP);
3449
3450                 if (op_ma > max_ma) {
3451                         op_ma = max_ma;
3452                         out_mv = (port->operating_snk_mw * 1000) / op_ma;
3453                         if ((port->operating_snk_mw * 1000) % op_ma)
3454                                 ++out_mv;
3455                         out_mv += RDO_PROG_VOLT_MV_STEP -
3456                                   (out_mv % RDO_PROG_VOLT_MV_STEP);
3457
3458                         if (out_mv > max_mv) {
3459                                 tcpm_log(port, "Invalid PPS APDO selected!");
3460                                 return -EINVAL;
3461                         }
3462                 }
3463         }
3464
3465         tcpm_log(port, "cc=%d cc1=%d cc2=%d vbus=%d vconn=%s polarity=%d",
3466                  port->cc_req, port->cc1, port->cc2, port->vbus_source,
3467                  port->vconn_role == TYPEC_SOURCE ? "source" : "sink",
3468                  port->polarity);
3469
3470         *rdo = RDO_PROG(src_pdo_index + 1, out_mv, op_ma, flags);
3471
3472         tcpm_log(port, "Requesting APDO %d: %u mV, %u mA",
3473                  src_pdo_index, out_mv, op_ma);
3474
3475         port->pps_data.req_op_curr = op_ma;
3476         port->pps_data.req_out_volt = out_mv;
3477
3478         return 0;
3479 }
3480
3481 static int tcpm_pd_send_pps_request(struct tcpm_port *port)
3482 {
3483         struct pd_message msg;
3484         int ret;
3485         u32 rdo;
3486
3487         ret = tcpm_pd_build_pps_request(port, &rdo);
3488         if (ret < 0)
3489                 return ret;
3490
3491         /* Relax the threshold as voltage will be adjusted right after Accept Message. */
3492         tcpm_set_auto_vbus_discharge_threshold(port, TYPEC_PWR_MODE_USB, false, 0);
3493
3494         memset(&msg, 0, sizeof(msg));
3495         msg.header = PD_HEADER_LE(PD_DATA_REQUEST,
3496                                   port->pwr_role,
3497                                   port->data_role,
3498                                   port->negotiated_rev,
3499                                   port->message_id, 1);
3500         msg.payload[0] = cpu_to_le32(rdo);
3501
3502         return tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
3503 }
3504
3505 static int tcpm_set_vbus(struct tcpm_port *port, bool enable)
3506 {
3507         int ret;
3508
3509         if (enable && port->vbus_charge)
3510                 return -EINVAL;
3511
3512         tcpm_log(port, "vbus:=%d charge=%d", enable, port->vbus_charge);
3513
3514         ret = port->tcpc->set_vbus(port->tcpc, enable, port->vbus_charge);
3515         if (ret < 0)
3516                 return ret;
3517
3518         port->vbus_source = enable;
3519         return 0;
3520 }
3521
3522 static int tcpm_set_charge(struct tcpm_port *port, bool charge)
3523 {
3524         int ret;
3525
3526         if (charge && port->vbus_source)
3527                 return -EINVAL;
3528
3529         if (charge != port->vbus_charge) {
3530                 tcpm_log(port, "vbus=%d charge:=%d", port->vbus_source, charge);
3531                 ret = port->tcpc->set_vbus(port->tcpc, port->vbus_source,
3532                                            charge);
3533                 if (ret < 0)
3534                         return ret;
3535         }
3536         port->vbus_charge = charge;
3537         power_supply_changed(port->psy);
3538         return 0;
3539 }
3540
3541 static bool tcpm_start_toggling(struct tcpm_port *port, enum typec_cc_status cc)
3542 {
3543         int ret;
3544
3545         if (!port->tcpc->start_toggling)
3546                 return false;
3547
3548         tcpm_log_force(port, "Start toggling");
3549         ret = port->tcpc->start_toggling(port->tcpc, port->port_type, cc);
3550         return ret == 0;
3551 }
3552
3553 static int tcpm_init_vbus(struct tcpm_port *port)
3554 {
3555         int ret;
3556
3557         ret = port->tcpc->set_vbus(port->tcpc, false, false);
3558         port->vbus_source = false;
3559         port->vbus_charge = false;
3560         return ret;
3561 }
3562
3563 static int tcpm_init_vconn(struct tcpm_port *port)
3564 {
3565         int ret;
3566
3567         ret = port->tcpc->set_vconn(port->tcpc, false);
3568         port->vconn_role = TYPEC_SINK;
3569         return ret;
3570 }
3571
3572 static void tcpm_typec_connect(struct tcpm_port *port)
3573 {
3574         if (!port->connected) {
3575                 /* Make sure we don't report stale identity information */
3576                 memset(&port->partner_ident, 0, sizeof(port->partner_ident));
3577                 port->partner_desc.usb_pd = port->pd_capable;
3578                 if (tcpm_port_is_debug(port))
3579                         port->partner_desc.accessory = TYPEC_ACCESSORY_DEBUG;
3580                 else if (tcpm_port_is_audio(port))
3581                         port->partner_desc.accessory = TYPEC_ACCESSORY_AUDIO;
3582                 else
3583                         port->partner_desc.accessory = TYPEC_ACCESSORY_NONE;
3584                 port->partner = typec_register_partner(port->typec_port,
3585                                                        &port->partner_desc);
3586                 port->connected = true;
3587                 typec_partner_set_usb_power_delivery(port->partner, port->partner_pd);
3588         }
3589 }
3590
3591 static int tcpm_src_attach(struct tcpm_port *port)
3592 {
3593         enum typec_cc_polarity polarity =
3594                                 port->cc2 == TYPEC_CC_RD ? TYPEC_POLARITY_CC2
3595                                                          : TYPEC_POLARITY_CC1;
3596         int ret;
3597
3598         if (port->attached)
3599                 return 0;
3600
3601         ret = tcpm_set_polarity(port, polarity);
3602         if (ret < 0)
3603                 return ret;
3604
3605         tcpm_enable_auto_vbus_discharge(port, true);
3606
3607         ret = tcpm_set_roles(port, true, TYPEC_SOURCE, tcpm_data_role_for_source(port));
3608         if (ret < 0)
3609                 return ret;
3610
3611         if (port->pd_supported) {
3612                 ret = port->tcpc->set_pd_rx(port->tcpc, true);
3613                 if (ret < 0)
3614                         goto out_disable_mux;
3615         }
3616
3617         /*
3618          * USB Type-C specification, version 1.2,
3619          * chapter 4.5.2.2.8.1 (Attached.SRC Requirements)
3620          * Enable VCONN only if the non-RD port is set to RA.
3621          */
3622         if ((polarity == TYPEC_POLARITY_CC1 && port->cc2 == TYPEC_CC_RA) ||
3623             (polarity == TYPEC_POLARITY_CC2 && port->cc1 == TYPEC_CC_RA)) {
3624                 ret = tcpm_set_vconn(port, true);
3625                 if (ret < 0)
3626                         goto out_disable_pd;
3627         }
3628
3629         ret = tcpm_set_vbus(port, true);
3630         if (ret < 0)
3631                 goto out_disable_vconn;
3632
3633         port->pd_capable = false;
3634
3635         port->partner = NULL;
3636
3637         port->attached = true;
3638         port->send_discover = true;
3639
3640         return 0;
3641
3642 out_disable_vconn:
3643         tcpm_set_vconn(port, false);
3644 out_disable_pd:
3645         if (port->pd_supported)
3646                 port->tcpc->set_pd_rx(port->tcpc, false);
3647 out_disable_mux:
3648         tcpm_mux_set(port, TYPEC_STATE_SAFE, USB_ROLE_NONE,
3649                      TYPEC_ORIENTATION_NONE);
3650         return ret;
3651 }
3652
3653 static void tcpm_typec_disconnect(struct tcpm_port *port)
3654 {
3655         if (port->connected) {
3656                 typec_partner_set_usb_power_delivery(port->partner, NULL);
3657                 typec_unregister_partner(port->partner);
3658                 port->partner = NULL;
3659                 port->connected = false;
3660         }
3661 }
3662
3663 static void tcpm_unregister_altmodes(struct tcpm_port *port)
3664 {
3665         struct pd_mode_data *modep = &port->mode_data;
3666         int i;
3667
3668         for (i = 0; i < modep->altmodes; i++) {
3669                 typec_unregister_altmode(port->partner_altmode[i]);
3670                 port->partner_altmode[i] = NULL;
3671         }
3672
3673         memset(modep, 0, sizeof(*modep));
3674 }
3675
3676 static void tcpm_set_partner_usb_comm_capable(struct tcpm_port *port, bool capable)
3677 {
3678         tcpm_log(port, "Setting usb_comm capable %s", capable ? "true" : "false");
3679
3680         if (port->tcpc->set_partner_usb_comm_capable)
3681                 port->tcpc->set_partner_usb_comm_capable(port->tcpc, capable);
3682 }
3683
3684 static void tcpm_reset_port(struct tcpm_port *port)
3685 {
3686         tcpm_enable_auto_vbus_discharge(port, false);
3687         port->in_ams = false;
3688         port->ams = NONE_AMS;
3689         port->vdm_sm_running = false;
3690         tcpm_unregister_altmodes(port);
3691         tcpm_typec_disconnect(port);
3692         port->attached = false;
3693         port->pd_capable = false;
3694         port->pps_data.supported = false;
3695         tcpm_set_partner_usb_comm_capable(port, false);
3696
3697         /*
3698          * First Rx ID should be 0; set this to a sentinel of -1 so that
3699          * we can check tcpm_pd_rx_handler() if we had seen it before.
3700          */
3701         port->rx_msgid = -1;
3702
3703         port->tcpc->set_pd_rx(port->tcpc, false);
3704         tcpm_init_vbus(port);   /* also disables charging */
3705         tcpm_init_vconn(port);
3706         tcpm_set_current_limit(port, 0, 0);
3707         tcpm_set_polarity(port, TYPEC_POLARITY_CC1);
3708         tcpm_mux_set(port, TYPEC_STATE_SAFE, USB_ROLE_NONE,
3709                      TYPEC_ORIENTATION_NONE);
3710         tcpm_set_attached_state(port, false);
3711         port->try_src_count = 0;
3712         port->try_snk_count = 0;
3713         port->usb_type = POWER_SUPPLY_USB_TYPE_C;
3714         power_supply_changed(port->psy);
3715         port->nr_sink_caps = 0;
3716         port->sink_cap_done = false;
3717         if (port->tcpc->enable_frs)
3718                 port->tcpc->enable_frs(port->tcpc, false);
3719
3720         usb_power_delivery_unregister_capabilities(port->partner_sink_caps);
3721         port->partner_sink_caps = NULL;
3722         usb_power_delivery_unregister_capabilities(port->partner_source_caps);
3723         port->partner_source_caps = NULL;
3724         usb_power_delivery_unregister(port->partner_pd);
3725         port->partner_pd = NULL;
3726 }
3727
3728 static void tcpm_detach(struct tcpm_port *port)
3729 {
3730         if (tcpm_port_is_disconnected(port))
3731                 port->hard_reset_count = 0;
3732
3733         port->try_src_count = 0;
3734         port->try_snk_count = 0;
3735
3736         if (!port->attached)
3737                 return;
3738
3739         if (port->tcpc->set_bist_data) {
3740                 tcpm_log(port, "disable BIST MODE TESTDATA");
3741                 port->tcpc->set_bist_data(port->tcpc, false);
3742         }
3743
3744         tcpm_reset_port(port);
3745 }
3746
3747 static void tcpm_src_detach(struct tcpm_port *port)
3748 {
3749         tcpm_detach(port);
3750 }
3751
3752 static int tcpm_snk_attach(struct tcpm_port *port)
3753 {
3754         int ret;
3755
3756         if (port->attached)
3757                 return 0;
3758
3759         ret = tcpm_set_polarity(port, port->cc2 != TYPEC_CC_OPEN ?
3760                                 TYPEC_POLARITY_CC2 : TYPEC_POLARITY_CC1);
3761         if (ret < 0)
3762                 return ret;
3763
3764         tcpm_enable_auto_vbus_discharge(port, true);
3765
3766         ret = tcpm_set_roles(port, true, TYPEC_SINK, tcpm_data_role_for_sink(port));
3767         if (ret < 0)
3768                 return ret;
3769
3770         port->pd_capable = false;
3771
3772         port->partner = NULL;
3773
3774         port->attached = true;
3775         port->send_discover = true;
3776
3777         return 0;
3778 }
3779
3780 static void tcpm_snk_detach(struct tcpm_port *port)
3781 {
3782         tcpm_detach(port);
3783 }
3784
3785 static int tcpm_acc_attach(struct tcpm_port *port)
3786 {
3787         int ret;
3788
3789         if (port->attached)
3790                 return 0;
3791
3792         ret = tcpm_set_roles(port, true, TYPEC_SOURCE,
3793                              tcpm_data_role_for_source(port));
3794         if (ret < 0)
3795                 return ret;
3796
3797         port->partner = NULL;
3798
3799         tcpm_typec_connect(port);
3800
3801         port->attached = true;
3802
3803         return 0;
3804 }
3805
3806 static void tcpm_acc_detach(struct tcpm_port *port)
3807 {
3808         tcpm_detach(port);
3809 }
3810
3811 static inline enum tcpm_state hard_reset_state(struct tcpm_port *port)
3812 {
3813         if (port->hard_reset_count < PD_N_HARD_RESET_COUNT)
3814                 return HARD_RESET_SEND;
3815         if (port->pd_capable)
3816                 return ERROR_RECOVERY;
3817         if (port->pwr_role == TYPEC_SOURCE)
3818                 return SRC_UNATTACHED;
3819         if (port->state == SNK_WAIT_CAPABILITIES)
3820                 return SNK_READY;
3821         return SNK_UNATTACHED;
3822 }
3823
3824 static inline enum tcpm_state unattached_state(struct tcpm_port *port)
3825 {
3826         if (port->port_type == TYPEC_PORT_DRP) {
3827                 if (port->pwr_role == TYPEC_SOURCE)
3828                         return SRC_UNATTACHED;
3829                 else
3830                         return SNK_UNATTACHED;
3831         } else if (port->port_type == TYPEC_PORT_SRC) {
3832                 return SRC_UNATTACHED;
3833         }
3834
3835         return SNK_UNATTACHED;
3836 }
3837
3838 static void tcpm_swap_complete(struct tcpm_port *port, int result)
3839 {
3840         if (port->swap_pending) {
3841                 port->swap_status = result;
3842                 port->swap_pending = false;
3843                 port->non_pd_role_swap = false;
3844                 complete(&port->swap_complete);
3845         }
3846 }
3847
3848 static enum typec_pwr_opmode tcpm_get_pwr_opmode(enum typec_cc_status cc)
3849 {
3850         switch (cc) {
3851         case TYPEC_CC_RP_1_5:
3852                 return TYPEC_PWR_MODE_1_5A;
3853         case TYPEC_CC_RP_3_0:
3854                 return TYPEC_PWR_MODE_3_0A;
3855         case TYPEC_CC_RP_DEF:
3856         default:
3857                 return TYPEC_PWR_MODE_USB;
3858         }
3859 }
3860
3861 static enum typec_cc_status tcpm_pwr_opmode_to_rp(enum typec_pwr_opmode opmode)
3862 {
3863         switch (opmode) {
3864         case TYPEC_PWR_MODE_USB:
3865                 return TYPEC_CC_RP_DEF;
3866         case TYPEC_PWR_MODE_1_5A:
3867                 return TYPEC_CC_RP_1_5;
3868         case TYPEC_PWR_MODE_3_0A:
3869         case TYPEC_PWR_MODE_PD:
3870         default:
3871                 return TYPEC_CC_RP_3_0;
3872         }
3873 }
3874
3875 static void tcpm_set_initial_svdm_version(struct tcpm_port *port)
3876 {
3877         switch (port->negotiated_rev) {
3878         case PD_REV30:
3879                 break;
3880         /*
3881          * 6.4.4.2.3 Structured VDM Version
3882          * 2.0 states "At this time, there is only one version (1.0) defined.
3883          * This field Shall be set to zero to indicate Version 1.0."
3884          * 3.0 states "This field Shall be set to 01b to indicate Version 2.0."
3885          * To ensure that we follow the Power Delivery revision we are currently
3886          * operating on, downgrade the SVDM version to the highest one supported
3887          * by the Power Delivery revision.
3888          */
3889         case PD_REV20:
3890                 typec_partner_set_svdm_version(port->partner, SVDM_VER_1_0);
3891                 break;
3892         default:
3893                 typec_partner_set_svdm_version(port->partner, SVDM_VER_1_0);
3894                 break;
3895         }
3896 }
3897
3898 static void run_state_machine(struct tcpm_port *port)
3899 {
3900         int ret;
3901         enum typec_pwr_opmode opmode;
3902         unsigned int msecs;
3903         enum tcpm_state upcoming_state;
3904
3905         if (port->tcpc->check_contaminant && port->state != CHECK_CONTAMINANT)
3906                 port->potential_contaminant = ((port->enter_state == SRC_ATTACH_WAIT &&
3907                                                 port->state == SRC_UNATTACHED) ||
3908                                                (port->enter_state == SNK_ATTACH_WAIT &&
3909                                                 port->state == SNK_UNATTACHED) ||
3910                                                (port->enter_state == SNK_DEBOUNCED &&
3911                                                 port->state == SNK_UNATTACHED));
3912
3913         port->enter_state = port->state;
3914         switch (port->state) {
3915         case TOGGLING:
3916                 break;
3917         case CHECK_CONTAMINANT:
3918                 port->tcpc->check_contaminant(port->tcpc);
3919                 break;
3920         /* SRC states */
3921         case SRC_UNATTACHED:
3922                 if (!port->non_pd_role_swap)
3923                         tcpm_swap_complete(port, -ENOTCONN);
3924                 tcpm_src_detach(port);
3925                 if (port->potential_contaminant) {
3926                         tcpm_set_state(port, CHECK_CONTAMINANT, 0);
3927                         break;
3928                 }
3929                 if (tcpm_start_toggling(port, tcpm_rp_cc(port))) {
3930                         tcpm_set_state(port, TOGGLING, 0);
3931                         break;
3932                 }
3933                 tcpm_set_cc(port, tcpm_rp_cc(port));
3934                 if (port->port_type == TYPEC_PORT_DRP)
3935                         tcpm_set_state(port, SNK_UNATTACHED, PD_T_DRP_SNK);
3936                 break;
3937         case SRC_ATTACH_WAIT:
3938                 if (tcpm_port_is_debug(port))
3939                         tcpm_set_state(port, DEBUG_ACC_ATTACHED,
3940                                        PD_T_CC_DEBOUNCE);
3941                 else if (tcpm_port_is_audio(port))
3942                         tcpm_set_state(port, AUDIO_ACC_ATTACHED,
3943                                        PD_T_CC_DEBOUNCE);
3944                 else if (tcpm_port_is_source(port) && port->vbus_vsafe0v)
3945                         tcpm_set_state(port,
3946                                        tcpm_try_snk(port) ? SNK_TRY
3947                                                           : SRC_ATTACHED,
3948                                        PD_T_CC_DEBOUNCE);
3949                 break;
3950
3951         case SNK_TRY:
3952                 port->try_snk_count++;
3953                 /*
3954                  * Requirements:
3955                  * - Do not drive vconn or vbus
3956                  * - Terminate CC pins (both) to Rd
3957                  * Action:
3958                  * - Wait for tDRPTry (PD_T_DRP_TRY).
3959                  *   Until then, ignore any state changes.
3960                  */
3961                 tcpm_set_cc(port, TYPEC_CC_RD);
3962                 tcpm_set_state(port, SNK_TRY_WAIT, PD_T_DRP_TRY);
3963                 break;
3964         case SNK_TRY_WAIT:
3965                 if (tcpm_port_is_sink(port)) {
3966                         tcpm_set_state(port, SNK_TRY_WAIT_DEBOUNCE, 0);
3967                 } else {
3968                         tcpm_set_state(port, SRC_TRYWAIT, 0);
3969                         port->max_wait = 0;
3970                 }
3971                 break;
3972         case SNK_TRY_WAIT_DEBOUNCE:
3973                 tcpm_set_state(port, SNK_TRY_WAIT_DEBOUNCE_CHECK_VBUS,
3974                                PD_T_TRY_CC_DEBOUNCE);
3975                 break;
3976         case SNK_TRY_WAIT_DEBOUNCE_CHECK_VBUS:
3977                 if (port->vbus_present && tcpm_port_is_sink(port))
3978                         tcpm_set_state(port, SNK_ATTACHED, 0);
3979                 else
3980                         port->max_wait = 0;
3981                 break;
3982         case SRC_TRYWAIT:
3983                 tcpm_set_cc(port, tcpm_rp_cc(port));
3984                 if (port->max_wait == 0) {
3985                         port->max_wait = jiffies +
3986                                          msecs_to_jiffies(PD_T_DRP_TRY);
3987                         tcpm_set_state(port, SRC_TRYWAIT_UNATTACHED,
3988                                        PD_T_DRP_TRY);
3989                 } else {
3990                         if (time_is_after_jiffies(port->max_wait))
3991                                 tcpm_set_state(port, SRC_TRYWAIT_UNATTACHED,
3992                                                jiffies_to_msecs(port->max_wait -
3993                                                                 jiffies));
3994                         else
3995                                 tcpm_set_state(port, SNK_UNATTACHED, 0);
3996                 }
3997                 break;
3998         case SRC_TRYWAIT_DEBOUNCE:
3999                 tcpm_set_state(port, SRC_ATTACHED, PD_T_CC_DEBOUNCE);
4000                 break;
4001         case SRC_TRYWAIT_UNATTACHED:
4002                 tcpm_set_state(port, SNK_UNATTACHED, 0);
4003                 break;
4004
4005         case SRC_ATTACHED:
4006                 ret = tcpm_src_attach(port);
4007                 tcpm_set_state(port, SRC_UNATTACHED,
4008                                ret < 0 ? 0 : PD_T_PS_SOURCE_ON);
4009                 break;
4010         case SRC_STARTUP:
4011                 opmode =  tcpm_get_pwr_opmode(tcpm_rp_cc(port));
4012                 typec_set_pwr_opmode(port->typec_port, opmode);
4013                 port->pwr_opmode = TYPEC_PWR_MODE_USB;
4014                 port->caps_count = 0;
4015                 port->negotiated_rev = PD_MAX_REV;
4016                 port->message_id = 0;
4017                 port->rx_msgid = -1;
4018                 port->explicit_contract = false;
4019                 /* SNK -> SRC POWER/FAST_ROLE_SWAP finished */
4020                 if (port->ams == POWER_ROLE_SWAP ||
4021                     port->ams == FAST_ROLE_SWAP)
4022                         tcpm_ams_finish(port);
4023                 if (!port->pd_supported) {
4024                         tcpm_set_state(port, SRC_READY, 0);
4025                         break;
4026                 }
4027                 port->upcoming_state = SRC_SEND_CAPABILITIES;
4028                 tcpm_ams_start(port, POWER_NEGOTIATION);
4029                 break;
4030         case SRC_SEND_CAPABILITIES:
4031                 port->caps_count++;
4032                 if (port->caps_count > PD_N_CAPS_COUNT) {
4033                         tcpm_set_state(port, SRC_READY, 0);
4034                         break;
4035                 }
4036                 ret = tcpm_pd_send_source_caps(port);
4037                 if (ret < 0) {
4038                         tcpm_set_state(port, SRC_SEND_CAPABILITIES,
4039                                        PD_T_SEND_SOURCE_CAP);
4040                 } else {
4041                         /*
4042                          * Per standard, we should clear the reset counter here.
4043                          * However, that can result in state machine hang-ups.
4044                          * Reset it only in READY state to improve stability.
4045                          */
4046                         /* port->hard_reset_count = 0; */
4047                         port->caps_count = 0;
4048                         port->pd_capable = true;
4049                         tcpm_set_state_cond(port, SRC_SEND_CAPABILITIES_TIMEOUT,
4050                                             PD_T_SEND_SOURCE_CAP);
4051                 }
4052                 break;
4053         case SRC_SEND_CAPABILITIES_TIMEOUT:
4054                 /*
4055                  * Error recovery for a PD_DATA_SOURCE_CAP reply timeout.
4056                  *
4057                  * PD 2.0 sinks are supposed to accept src-capabilities with a
4058                  * 3.0 header and simply ignore any src PDOs which the sink does
4059                  * not understand such as PPS but some 2.0 sinks instead ignore
4060                  * the entire PD_DATA_SOURCE_CAP message, causing contract
4061                  * negotiation to fail.
4062                  *
4063                  * After PD_N_HARD_RESET_COUNT hard-reset attempts, we try
4064                  * sending src-capabilities with a lower PD revision to
4065                  * make these broken sinks work.
4066                  */
4067                 if (port->hard_reset_count < PD_N_HARD_RESET_COUNT) {
4068                         tcpm_set_state(port, HARD_RESET_SEND, 0);
4069                 } else if (port->negotiated_rev > PD_REV20) {
4070                         port->negotiated_rev--;
4071                         port->hard_reset_count = 0;
4072                         tcpm_set_state(port, SRC_SEND_CAPABILITIES, 0);
4073                 } else {
4074                         tcpm_set_state(port, hard_reset_state(port), 0);
4075                 }
4076                 break;
4077         case SRC_NEGOTIATE_CAPABILITIES:
4078                 ret = tcpm_pd_check_request(port);
4079                 if (ret < 0) {
4080                         tcpm_pd_send_control(port, PD_CTRL_REJECT);
4081                         if (!port->explicit_contract) {
4082                                 tcpm_set_state(port,
4083                                                SRC_WAIT_NEW_CAPABILITIES, 0);
4084                         } else {
4085                                 tcpm_set_state(port, SRC_READY, 0);
4086                         }
4087                 } else {
4088                         tcpm_pd_send_control(port, PD_CTRL_ACCEPT);
4089                         tcpm_set_partner_usb_comm_capable(port,
4090                                                           !!(port->sink_request & RDO_USB_COMM));
4091                         tcpm_set_state(port, SRC_TRANSITION_SUPPLY,
4092                                        PD_T_SRC_TRANSITION);
4093                 }
4094                 break;
4095         case SRC_TRANSITION_SUPPLY:
4096                 /* XXX: regulator_set_voltage(vbus, ...) */
4097                 tcpm_pd_send_control(port, PD_CTRL_PS_RDY);
4098                 port->explicit_contract = true;
4099                 typec_set_pwr_opmode(port->typec_port, TYPEC_PWR_MODE_PD);
4100                 port->pwr_opmode = TYPEC_PWR_MODE_PD;
4101                 tcpm_set_state_cond(port, SRC_READY, 0);
4102                 break;
4103         case SRC_READY:
4104 #if 1
4105                 port->hard_reset_count = 0;
4106 #endif
4107                 port->try_src_count = 0;
4108
4109                 tcpm_swap_complete(port, 0);
4110                 tcpm_typec_connect(port);
4111
4112                 if (port->ams != NONE_AMS)
4113                         tcpm_ams_finish(port);
4114                 if (port->next_ams != NONE_AMS) {
4115                         port->ams = port->next_ams;
4116                         port->next_ams = NONE_AMS;
4117                 }
4118
4119                 /*
4120                  * If previous AMS is interrupted, switch to the upcoming
4121                  * state.
4122                  */
4123                 if (port->upcoming_state != INVALID_STATE) {
4124                         upcoming_state = port->upcoming_state;
4125                         port->upcoming_state = INVALID_STATE;
4126                         tcpm_set_state(port, upcoming_state, 0);
4127                         break;
4128                 }
4129
4130                 /*
4131                  * 6.4.4.3.1 Discover Identity
4132                  * "The Discover Identity Command Shall only be sent to SOP when there is an
4133                  * Explicit Contract."
4134                  * For now, this driver only supports SOP for DISCOVER_IDENTITY, thus using
4135                  * port->explicit_contract to decide whether to send the command.
4136                  */
4137                 if (port->explicit_contract) {
4138                         tcpm_set_initial_svdm_version(port);
4139                         mod_send_discover_delayed_work(port, 0);
4140                 } else {
4141                         port->send_discover = false;
4142                 }
4143
4144                 /*
4145                  * 6.3.5
4146                  * Sending ping messages is not necessary if
4147                  * - the source operates at vSafe5V
4148                  * or
4149                  * - The system is not operating in PD mode
4150                  * or
4151                  * - Both partners are connected using a Type-C connector
4152                  *
4153                  * There is no actual need to send PD messages since the local
4154                  * port type-c and the spec does not clearly say whether PD is
4155                  * possible when type-c is connected to Type-A/B
4156                  */
4157                 break;
4158         case SRC_WAIT_NEW_CAPABILITIES:
4159                 /* Nothing to do... */
4160                 break;
4161
4162         /* SNK states */
4163         case SNK_UNATTACHED:
4164                 if (!port->non_pd_role_swap)
4165                         tcpm_swap_complete(port, -ENOTCONN);
4166                 tcpm_pps_complete(port, -ENOTCONN);
4167                 tcpm_snk_detach(port);
4168                 if (port->potential_contaminant) {
4169                         tcpm_set_state(port, CHECK_CONTAMINANT, 0);
4170                         break;
4171                 }
4172                 if (tcpm_start_toggling(port, TYPEC_CC_RD)) {
4173                         tcpm_set_state(port, TOGGLING, 0);
4174                         break;
4175                 }
4176                 tcpm_set_cc(port, TYPEC_CC_RD);
4177                 if (port->port_type == TYPEC_PORT_DRP)
4178                         tcpm_set_state(port, SRC_UNATTACHED, PD_T_DRP_SRC);
4179                 break;
4180         case SNK_ATTACH_WAIT:
4181                 if ((port->cc1 == TYPEC_CC_OPEN &&
4182                      port->cc2 != TYPEC_CC_OPEN) ||
4183                     (port->cc1 != TYPEC_CC_OPEN &&
4184                      port->cc2 == TYPEC_CC_OPEN))
4185                         tcpm_set_state(port, SNK_DEBOUNCED,
4186                                        PD_T_CC_DEBOUNCE);
4187                 else if (tcpm_port_is_disconnected(port))
4188                         tcpm_set_state(port, SNK_UNATTACHED,
4189                                        PD_T_PD_DEBOUNCE);
4190                 break;
4191         case SNK_DEBOUNCED:
4192                 if (tcpm_port_is_disconnected(port))
4193                         tcpm_set_state(port, SNK_UNATTACHED,
4194                                        PD_T_PD_DEBOUNCE);
4195                 else if (port->vbus_present)
4196                         tcpm_set_state(port,
4197                                        tcpm_try_src(port) ? SRC_TRY
4198                                                           : SNK_ATTACHED,
4199                                        0);
4200                 break;
4201         case SRC_TRY:
4202                 port->try_src_count++;
4203                 tcpm_set_cc(port, tcpm_rp_cc(port));
4204                 port->max_wait = 0;
4205                 tcpm_set_state(port, SRC_TRY_WAIT, 0);
4206                 break;
4207         case SRC_TRY_WAIT:
4208                 if (port->max_wait == 0) {
4209                         port->max_wait = jiffies +
4210                                          msecs_to_jiffies(PD_T_DRP_TRY);
4211                         msecs = PD_T_DRP_TRY;
4212                 } else {
4213                         if (time_is_after_jiffies(port->max_wait))
4214                                 msecs = jiffies_to_msecs(port->max_wait -
4215                                                          jiffies);
4216                         else
4217                                 msecs = 0;
4218                 }
4219                 tcpm_set_state(port, SNK_TRYWAIT, msecs);
4220                 break;
4221         case SRC_TRY_DEBOUNCE:
4222                 tcpm_set_state(port, SRC_ATTACHED, PD_T_PD_DEBOUNCE);
4223                 break;
4224         case SNK_TRYWAIT:
4225                 tcpm_set_cc(port, TYPEC_CC_RD);
4226                 tcpm_set_state(port, SNK_TRYWAIT_VBUS, PD_T_CC_DEBOUNCE);
4227                 break;
4228         case SNK_TRYWAIT_VBUS:
4229                 /*
4230                  * TCPM stays in this state indefinitely until VBUS
4231                  * is detected as long as Rp is not detected for
4232                  * more than a time period of tPDDebounce.
4233                  */
4234                 if (port->vbus_present && tcpm_port_is_sink(port)) {
4235                         tcpm_set_state(port, SNK_ATTACHED, 0);
4236                         break;
4237                 }
4238                 if (!tcpm_port_is_sink(port))
4239                         tcpm_set_state(port, SNK_TRYWAIT_DEBOUNCE, 0);
4240                 break;
4241         case SNK_TRYWAIT_DEBOUNCE:
4242                 tcpm_set_state(port, SNK_UNATTACHED, PD_T_PD_DEBOUNCE);
4243                 break;
4244         case SNK_ATTACHED:
4245                 ret = tcpm_snk_attach(port);
4246                 if (ret < 0)
4247                         tcpm_set_state(port, SNK_UNATTACHED, 0);
4248                 else
4249                         tcpm_set_state(port, SNK_STARTUP, 0);
4250                 break;
4251         case SNK_STARTUP:
4252                 opmode =  tcpm_get_pwr_opmode(port->polarity ?
4253                                               port->cc2 : port->cc1);
4254                 typec_set_pwr_opmode(port->typec_port, opmode);
4255                 port->pwr_opmode = TYPEC_PWR_MODE_USB;
4256                 port->negotiated_rev = PD_MAX_REV;
4257                 port->message_id = 0;
4258                 port->rx_msgid = -1;
4259                 port->explicit_contract = false;
4260
4261                 if (port->ams == POWER_ROLE_SWAP ||
4262                     port->ams == FAST_ROLE_SWAP)
4263                         /* SRC -> SNK POWER/FAST_ROLE_SWAP finished */
4264                         tcpm_ams_finish(port);
4265
4266                 tcpm_set_state(port, SNK_DISCOVERY, 0);
4267                 break;
4268         case SNK_DISCOVERY:
4269                 if (port->vbus_present) {
4270                         u32 current_lim = tcpm_get_current_limit(port);
4271
4272                         if (port->slow_charger_loop && (current_lim > PD_P_SNK_STDBY_MW / 5))
4273                                 current_lim = PD_P_SNK_STDBY_MW / 5;
4274                         tcpm_set_current_limit(port, current_lim, 5000);
4275                         /* Not sink vbus if operational current is 0mA */
4276                         tcpm_set_charge(port, !port->pd_supported ||
4277                                         pdo_max_current(port->snk_pdo[0]));
4278
4279                         if (!port->pd_supported)
4280                                 tcpm_set_state(port, SNK_READY, 0);
4281                         else
4282                                 tcpm_set_state(port, SNK_WAIT_CAPABILITIES, 0);
4283                         break;
4284                 }
4285                 /*
4286                  * For DRP, timeouts differ. Also, handling is supposed to be
4287                  * different and much more complex (dead battery detection;
4288                  * see USB power delivery specification, section 8.3.3.6.1.5.1).
4289                  */
4290                 tcpm_set_state(port, hard_reset_state(port),
4291                                port->port_type == TYPEC_PORT_DRP ?
4292                                         PD_T_DB_DETECT : PD_T_NO_RESPONSE);
4293                 break;
4294         case SNK_DISCOVERY_DEBOUNCE:
4295                 tcpm_set_state(port, SNK_DISCOVERY_DEBOUNCE_DONE,
4296                                PD_T_CC_DEBOUNCE);
4297                 break;
4298         case SNK_DISCOVERY_DEBOUNCE_DONE:
4299                 if (!tcpm_port_is_disconnected(port) &&
4300                     tcpm_port_is_sink(port) &&
4301                     ktime_after(port->delayed_runtime, ktime_get())) {
4302                         tcpm_set_state(port, SNK_DISCOVERY,
4303                                        ktime_to_ms(ktime_sub(port->delayed_runtime, ktime_get())));
4304                         break;
4305                 }
4306                 tcpm_set_state(port, unattached_state(port), 0);
4307                 break;
4308         case SNK_WAIT_CAPABILITIES:
4309                 ret = port->tcpc->set_pd_rx(port->tcpc, true);
4310                 if (ret < 0) {
4311                         tcpm_set_state(port, SNK_READY, 0);
4312                         break;
4313                 }
4314                 /*
4315                  * If VBUS has never been low, and we time out waiting
4316                  * for source cap, try a soft reset first, in case we
4317                  * were already in a stable contract before this boot.
4318                  * Do this only once.
4319                  */
4320                 if (port->vbus_never_low) {
4321                         port->vbus_never_low = false;
4322                         tcpm_set_state(port, SNK_SOFT_RESET,
4323                                        PD_T_SINK_WAIT_CAP);
4324                 } else {
4325                         tcpm_set_state(port, hard_reset_state(port),
4326                                        PD_T_SINK_WAIT_CAP);
4327                 }
4328                 break;
4329         case SNK_NEGOTIATE_CAPABILITIES:
4330                 port->pd_capable = true;
4331                 tcpm_set_partner_usb_comm_capable(port,
4332                                                   !!(port->source_caps[0] & PDO_FIXED_USB_COMM));
4333                 port->hard_reset_count = 0;
4334                 ret = tcpm_pd_send_request(port);
4335                 if (ret < 0) {
4336                         /* Restore back to the original state */
4337                         tcpm_set_auto_vbus_discharge_threshold(port, TYPEC_PWR_MODE_PD,
4338                                                                port->pps_data.active,
4339                                                                port->supply_voltage);
4340                         /* Let the Source send capabilities again. */
4341                         tcpm_set_state(port, SNK_WAIT_CAPABILITIES, 0);
4342                 } else {
4343                         tcpm_set_state_cond(port, hard_reset_state(port),
4344                                             PD_T_SENDER_RESPONSE);
4345                 }
4346                 break;
4347         case SNK_NEGOTIATE_PPS_CAPABILITIES:
4348                 ret = tcpm_pd_send_pps_request(port);
4349                 if (ret < 0) {
4350                         /* Restore back to the original state */
4351                         tcpm_set_auto_vbus_discharge_threshold(port, TYPEC_PWR_MODE_PD,
4352                                                                port->pps_data.active,
4353                                                                port->supply_voltage);
4354                         port->pps_status = ret;
4355                         /*
4356                          * If this was called due to updates to sink
4357                          * capabilities, and pps is no longer valid, we should
4358                          * safely fall back to a standard PDO.
4359                          */
4360                         if (port->update_sink_caps)
4361                                 tcpm_set_state(port, SNK_NEGOTIATE_CAPABILITIES, 0);
4362                         else
4363                                 tcpm_set_state(port, SNK_READY, 0);
4364                 } else {
4365                         tcpm_set_state_cond(port, hard_reset_state(port),
4366                                             PD_T_SENDER_RESPONSE);
4367                 }
4368                 break;
4369         case SNK_TRANSITION_SINK:
4370                 /* From the USB PD spec:
4371                  * "The Sink Shall transition to Sink Standby before a positive or
4372                  * negative voltage transition of VBUS. During Sink Standby
4373                  * the Sink Shall reduce its power draw to pSnkStdby."
4374                  *
4375                  * This is not applicable to PPS though as the port can continue
4376                  * to draw negotiated power without switching to standby.
4377                  */
4378                 if (port->supply_voltage != port->req_supply_voltage && !port->pps_data.active &&
4379                     port->current_limit * port->supply_voltage / 1000 > PD_P_SNK_STDBY_MW) {
4380                         u32 stdby_ma = PD_P_SNK_STDBY_MW * 1000 / port->supply_voltage;
4381
4382                         tcpm_log(port, "Setting standby current %u mV @ %u mA",
4383                                  port->supply_voltage, stdby_ma);
4384                         tcpm_set_current_limit(port, stdby_ma, port->supply_voltage);
4385                 }
4386                 fallthrough;
4387         case SNK_TRANSITION_SINK_VBUS:
4388                 tcpm_set_state(port, hard_reset_state(port),
4389                                PD_T_PS_TRANSITION);
4390                 break;
4391         case SNK_READY:
4392                 port->try_snk_count = 0;
4393                 port->update_sink_caps = false;
4394                 if (port->explicit_contract) {
4395                         typec_set_pwr_opmode(port->typec_port,
4396                                              TYPEC_PWR_MODE_PD);
4397                         port->pwr_opmode = TYPEC_PWR_MODE_PD;
4398                 }
4399
4400                 if (!port->pd_capable && port->slow_charger_loop)
4401                         tcpm_set_current_limit(port, tcpm_get_current_limit(port), 5000);
4402                 tcpm_swap_complete(port, 0);
4403                 tcpm_typec_connect(port);
4404                 mod_enable_frs_delayed_work(port, 0);
4405                 tcpm_pps_complete(port, port->pps_status);
4406
4407                 if (port->ams != NONE_AMS)
4408                         tcpm_ams_finish(port);
4409                 if (port->next_ams != NONE_AMS) {
4410                         port->ams = port->next_ams;
4411                         port->next_ams = NONE_AMS;
4412                 }
4413
4414                 /*
4415                  * If previous AMS is interrupted, switch to the upcoming
4416                  * state.
4417                  */
4418                 if (port->upcoming_state != INVALID_STATE) {
4419                         upcoming_state = port->upcoming_state;
4420                         port->upcoming_state = INVALID_STATE;
4421                         tcpm_set_state(port, upcoming_state, 0);
4422                         break;
4423                 }
4424
4425                 /*
4426                  * 6.4.4.3.1 Discover Identity
4427                  * "The Discover Identity Command Shall only be sent to SOP when there is an
4428                  * Explicit Contract."
4429                  * For now, this driver only supports SOP for DISCOVER_IDENTITY, thus using
4430                  * port->explicit_contract.
4431                  */
4432                 if (port->explicit_contract) {
4433                         tcpm_set_initial_svdm_version(port);
4434                         mod_send_discover_delayed_work(port, 0);
4435                 } else {
4436                         port->send_discover = false;
4437                 }
4438
4439                 power_supply_changed(port->psy);
4440                 break;
4441
4442         /* Accessory states */
4443         case ACC_UNATTACHED:
4444                 tcpm_acc_detach(port);
4445                 tcpm_set_state(port, SRC_UNATTACHED, 0);
4446                 break;
4447         case DEBUG_ACC_ATTACHED:
4448         case AUDIO_ACC_ATTACHED:
4449                 ret = tcpm_acc_attach(port);
4450                 if (ret < 0)
4451                         tcpm_set_state(port, ACC_UNATTACHED, 0);
4452                 break;
4453         case AUDIO_ACC_DEBOUNCE:
4454                 tcpm_set_state(port, ACC_UNATTACHED, PD_T_CC_DEBOUNCE);
4455                 break;
4456
4457         /* Hard_Reset states */
4458         case HARD_RESET_SEND:
4459                 if (port->ams != NONE_AMS)
4460                         tcpm_ams_finish(port);
4461                 /*
4462                  * State machine will be directed to HARD_RESET_START,
4463                  * thus set upcoming_state to INVALID_STATE.
4464                  */
4465                 port->upcoming_state = INVALID_STATE;
4466                 tcpm_ams_start(port, HARD_RESET);
4467                 break;
4468         case HARD_RESET_START:
4469                 port->sink_cap_done = false;
4470                 if (port->tcpc->enable_frs)
4471                         port->tcpc->enable_frs(port->tcpc, false);
4472                 port->hard_reset_count++;
4473                 port->tcpc->set_pd_rx(port->tcpc, false);
4474                 tcpm_unregister_altmodes(port);
4475                 port->nr_sink_caps = 0;
4476                 port->send_discover = true;
4477                 if (port->pwr_role == TYPEC_SOURCE)
4478                         tcpm_set_state(port, SRC_HARD_RESET_VBUS_OFF,
4479                                        PD_T_PS_HARD_RESET);
4480                 else
4481                         tcpm_set_state(port, SNK_HARD_RESET_SINK_OFF, 0);
4482                 break;
4483         case SRC_HARD_RESET_VBUS_OFF:
4484                 /*
4485                  * 7.1.5 Response to Hard Resets
4486                  * Hard Reset Signaling indicates a communication failure has occurred and the
4487                  * Source Shall stop driving VCONN, Shall remove Rp from the VCONN pin and Shall
4488                  * drive VBUS to vSafe0V as shown in Figure 7-9.
4489                  */
4490                 tcpm_set_vconn(port, false);
4491                 tcpm_set_vbus(port, false);
4492                 tcpm_set_roles(port, port->self_powered, TYPEC_SOURCE,
4493                                tcpm_data_role_for_source(port));
4494                 /*
4495                  * If tcpc fails to notify vbus off, TCPM will wait for PD_T_SAFE_0V +
4496                  * PD_T_SRC_RECOVER before turning vbus back on.
4497                  * From Table 7-12 Sequence Description for a Source Initiated Hard Reset:
4498                  * 4. Policy Engine waits tPSHardReset after sending Hard Reset Signaling and then
4499                  * tells the Device Policy Manager to instruct the power supply to perform a
4500                  * Hard Reset. The transition to vSafe0V Shall occur within tSafe0V (t2).
4501                  * 5. After tSrcRecover the Source applies power to VBUS in an attempt to
4502                  * re-establish communication with the Sink and resume USB Default Operation.
4503                  * The transition to vSafe5V Shall occur within tSrcTurnOn(t4).
4504                  */
4505                 tcpm_set_state(port, SRC_HARD_RESET_VBUS_ON, PD_T_SAFE_0V + PD_T_SRC_RECOVER);
4506                 break;
4507         case SRC_HARD_RESET_VBUS_ON:
4508                 tcpm_set_vconn(port, true);
4509                 tcpm_set_vbus(port, true);
4510                 if (port->ams == HARD_RESET)
4511                         tcpm_ams_finish(port);
4512                 if (port->pd_supported)
4513                         port->tcpc->set_pd_rx(port->tcpc, true);
4514                 tcpm_set_attached_state(port, true);
4515                 tcpm_set_state(port, SRC_UNATTACHED, PD_T_PS_SOURCE_ON);
4516                 break;
4517         case SNK_HARD_RESET_SINK_OFF:
4518                 /* Do not discharge/disconnect during hard reseet */
4519                 tcpm_set_auto_vbus_discharge_threshold(port, TYPEC_PWR_MODE_USB, false, 0);
4520                 memset(&port->pps_data, 0, sizeof(port->pps_data));
4521                 tcpm_set_vconn(port, false);
4522                 if (port->pd_capable)
4523                         tcpm_set_charge(port, false);
4524                 tcpm_set_roles(port, port->self_powered, TYPEC_SINK,
4525                                tcpm_data_role_for_sink(port));
4526                 /*
4527                  * VBUS may or may not toggle, depending on the adapter.
4528                  * If it doesn't toggle, transition to SNK_HARD_RESET_SINK_ON
4529                  * directly after timeout.
4530                  */
4531                 tcpm_set_state(port, SNK_HARD_RESET_SINK_ON, PD_T_SAFE_0V);
4532                 break;
4533         case SNK_HARD_RESET_WAIT_VBUS:
4534                 if (port->ams == HARD_RESET)
4535                         tcpm_ams_finish(port);
4536                 /* Assume we're disconnected if VBUS doesn't come back. */
4537                 tcpm_set_state(port, SNK_UNATTACHED,
4538                                PD_T_SRC_RECOVER_MAX + PD_T_SRC_TURN_ON);
4539                 break;
4540         case SNK_HARD_RESET_SINK_ON:
4541                 /* Note: There is no guarantee that VBUS is on in this state */
4542                 /*
4543                  * XXX:
4544                  * The specification suggests that dual mode ports in sink
4545                  * mode should transition to state PE_SRC_Transition_to_default.
4546                  * See USB power delivery specification chapter 8.3.3.6.1.3.
4547                  * This would mean to
4548                  * - turn off VCONN, reset power supply
4549                  * - request hardware reset
4550                  * - turn on VCONN
4551                  * - Transition to state PE_Src_Startup
4552                  * SNK only ports shall transition to state Snk_Startup
4553                  * (see chapter 8.3.3.3.8).
4554                  * Similar, dual-mode ports in source mode should transition
4555                  * to PE_SNK_Transition_to_default.
4556                  */
4557                 if (port->pd_capable) {
4558                         tcpm_set_current_limit(port,
4559                                                tcpm_get_current_limit(port),
4560                                                5000);
4561                         /* Not sink vbus if operational current is 0mA */
4562                         tcpm_set_charge(port, !!pdo_max_current(port->snk_pdo[0]));
4563                 }
4564                 if (port->ams == HARD_RESET)
4565                         tcpm_ams_finish(port);
4566                 tcpm_set_attached_state(port, true);
4567                 tcpm_set_auto_vbus_discharge_threshold(port, TYPEC_PWR_MODE_USB, false, VSAFE5V);
4568                 tcpm_set_state(port, SNK_STARTUP, 0);
4569                 break;
4570
4571         /* Soft_Reset states */
4572         case SOFT_RESET:
4573                 port->message_id = 0;
4574                 port->rx_msgid = -1;
4575                 /* remove existing capabilities */
4576                 usb_power_delivery_unregister_capabilities(port->partner_source_caps);
4577                 port->partner_source_caps = NULL;
4578                 tcpm_pd_send_control(port, PD_CTRL_ACCEPT);
4579                 tcpm_ams_finish(port);
4580                 if (port->pwr_role == TYPEC_SOURCE) {
4581                         port->upcoming_state = SRC_SEND_CAPABILITIES;
4582                         tcpm_ams_start(port, POWER_NEGOTIATION);
4583                 } else {
4584                         tcpm_set_state(port, SNK_WAIT_CAPABILITIES, 0);
4585                 }
4586                 break;
4587         case SRC_SOFT_RESET_WAIT_SNK_TX:
4588         case SNK_SOFT_RESET:
4589                 if (port->ams != NONE_AMS)
4590                         tcpm_ams_finish(port);
4591                 port->upcoming_state = SOFT_RESET_SEND;
4592                 tcpm_ams_start(port, SOFT_RESET_AMS);
4593                 break;
4594         case SOFT_RESET_SEND:
4595                 port->message_id = 0;
4596                 port->rx_msgid = -1;
4597                 /* remove existing capabilities */
4598                 usb_power_delivery_unregister_capabilities(port->partner_source_caps);
4599                 port->partner_source_caps = NULL;
4600                 if (tcpm_pd_send_control(port, PD_CTRL_SOFT_RESET))
4601                         tcpm_set_state_cond(port, hard_reset_state(port), 0);
4602                 else
4603                         tcpm_set_state_cond(port, hard_reset_state(port),
4604                                             PD_T_SENDER_RESPONSE);
4605                 break;
4606
4607         /* DR_Swap states */
4608         case DR_SWAP_SEND:
4609                 tcpm_pd_send_control(port, PD_CTRL_DR_SWAP);
4610                 if (port->data_role == TYPEC_DEVICE || port->negotiated_rev > PD_REV20)
4611                         port->send_discover = true;
4612                 tcpm_set_state_cond(port, DR_SWAP_SEND_TIMEOUT,
4613                                     PD_T_SENDER_RESPONSE);
4614                 break;
4615         case DR_SWAP_ACCEPT:
4616                 tcpm_pd_send_control(port, PD_CTRL_ACCEPT);
4617                 if (port->data_role == TYPEC_DEVICE || port->negotiated_rev > PD_REV20)
4618                         port->send_discover = true;
4619                 tcpm_set_state_cond(port, DR_SWAP_CHANGE_DR, 0);
4620                 break;
4621         case DR_SWAP_SEND_TIMEOUT:
4622                 tcpm_swap_complete(port, -ETIMEDOUT);
4623                 port->send_discover = false;
4624                 tcpm_ams_finish(port);
4625                 tcpm_set_state(port, ready_state(port), 0);
4626                 break;
4627         case DR_SWAP_CHANGE_DR:
4628                 tcpm_unregister_altmodes(port);
4629                 if (port->data_role == TYPEC_HOST)
4630                         tcpm_set_roles(port, true, port->pwr_role,
4631                                        TYPEC_DEVICE);
4632                 else
4633                         tcpm_set_roles(port, true, port->pwr_role,
4634                                        TYPEC_HOST);
4635                 tcpm_ams_finish(port);
4636                 tcpm_set_state(port, ready_state(port), 0);
4637                 break;
4638
4639         case FR_SWAP_SEND:
4640                 if (tcpm_pd_send_control(port, PD_CTRL_FR_SWAP)) {
4641                         tcpm_set_state(port, ERROR_RECOVERY, 0);
4642                         break;
4643                 }
4644                 tcpm_set_state_cond(port, FR_SWAP_SEND_TIMEOUT, PD_T_SENDER_RESPONSE);
4645                 break;
4646         case FR_SWAP_SEND_TIMEOUT:
4647                 tcpm_set_state(port, ERROR_RECOVERY, 0);
4648                 break;
4649         case FR_SWAP_SNK_SRC_TRANSITION_TO_OFF:
4650                 tcpm_set_state(port, ERROR_RECOVERY, PD_T_PS_SOURCE_OFF);
4651                 break;
4652         case FR_SWAP_SNK_SRC_NEW_SINK_READY:
4653                 if (port->vbus_source)
4654                         tcpm_set_state(port, FR_SWAP_SNK_SRC_SOURCE_VBUS_APPLIED, 0);
4655                 else
4656                         tcpm_set_state(port, ERROR_RECOVERY, PD_T_RECEIVER_RESPONSE);
4657                 break;
4658         case FR_SWAP_SNK_SRC_SOURCE_VBUS_APPLIED:
4659                 tcpm_set_pwr_role(port, TYPEC_SOURCE);
4660                 if (tcpm_pd_send_control(port, PD_CTRL_PS_RDY)) {
4661                         tcpm_set_state(port, ERROR_RECOVERY, 0);
4662                         break;
4663                 }
4664                 tcpm_set_cc(port, tcpm_rp_cc(port));
4665                 tcpm_set_state(port, SRC_STARTUP, PD_T_SWAP_SRC_START);
4666                 break;
4667
4668         /* PR_Swap states */
4669         case PR_SWAP_ACCEPT:
4670                 tcpm_pd_send_control(port, PD_CTRL_ACCEPT);
4671                 tcpm_set_state(port, PR_SWAP_START, 0);
4672                 break;
4673         case PR_SWAP_SEND:
4674                 tcpm_pd_send_control(port, PD_CTRL_PR_SWAP);
4675                 tcpm_set_state_cond(port, PR_SWAP_SEND_TIMEOUT,
4676                                     PD_T_SENDER_RESPONSE);
4677                 break;
4678         case PR_SWAP_SEND_TIMEOUT:
4679                 tcpm_swap_complete(port, -ETIMEDOUT);
4680                 tcpm_set_state(port, ready_state(port), 0);
4681                 break;
4682         case PR_SWAP_START:
4683                 tcpm_apply_rc(port);
4684                 if (port->pwr_role == TYPEC_SOURCE)
4685                         tcpm_set_state(port, PR_SWAP_SRC_SNK_TRANSITION_OFF,
4686                                        PD_T_SRC_TRANSITION);
4687                 else
4688                         tcpm_set_state(port, PR_SWAP_SNK_SRC_SINK_OFF, 0);
4689                 break;
4690         case PR_SWAP_SRC_SNK_TRANSITION_OFF:
4691                 /*
4692                  * Prevent vbus discharge circuit from turning on during PR_SWAP
4693                  * as this is not a disconnect.
4694                  */
4695                 tcpm_set_vbus(port, false);
4696                 port->explicit_contract = false;
4697                 /* allow time for Vbus discharge, must be < tSrcSwapStdby */
4698                 tcpm_set_state(port, PR_SWAP_SRC_SNK_SOURCE_OFF,
4699                                PD_T_SRCSWAPSTDBY);
4700                 break;
4701         case PR_SWAP_SRC_SNK_SOURCE_OFF:
4702                 tcpm_set_cc(port, TYPEC_CC_RD);
4703                 /* allow CC debounce */
4704                 tcpm_set_state(port, PR_SWAP_SRC_SNK_SOURCE_OFF_CC_DEBOUNCED,
4705                                PD_T_CC_DEBOUNCE);
4706                 break;
4707         case PR_SWAP_SRC_SNK_SOURCE_OFF_CC_DEBOUNCED:
4708                 /*
4709                  * USB-PD standard, 6.2.1.4, Port Power Role:
4710                  * "During the Power Role Swap Sequence, for the initial Source
4711                  * Port, the Port Power Role field shall be set to Sink in the
4712                  * PS_RDY Message indicating that the initial Source’s power
4713                  * supply is turned off"
4714                  */
4715                 tcpm_set_pwr_role(port, TYPEC_SINK);
4716                 if (tcpm_pd_send_control(port, PD_CTRL_PS_RDY)) {
4717                         tcpm_set_state(port, ERROR_RECOVERY, 0);
4718                         break;
4719                 }
4720                 tcpm_set_state(port, ERROR_RECOVERY, PD_T_PS_SOURCE_ON_PRS);
4721                 break;
4722         case PR_SWAP_SRC_SNK_SINK_ON:
4723                 tcpm_enable_auto_vbus_discharge(port, true);
4724                 /* Set the vbus disconnect threshold for implicit contract */
4725                 tcpm_set_auto_vbus_discharge_threshold(port, TYPEC_PWR_MODE_USB, false, VSAFE5V);
4726                 tcpm_set_state(port, SNK_STARTUP, 0);
4727                 break;
4728         case PR_SWAP_SNK_SRC_SINK_OFF:
4729                 /* will be source, remove existing capabilities */
4730                 usb_power_delivery_unregister_capabilities(port->partner_source_caps);
4731                 port->partner_source_caps = NULL;
4732                 /*
4733                  * Prevent vbus discharge circuit from turning on during PR_SWAP
4734                  * as this is not a disconnect.
4735                  */
4736                 tcpm_set_auto_vbus_discharge_threshold(port, TYPEC_PWR_MODE_USB,
4737                                                        port->pps_data.active, 0);
4738                 tcpm_set_charge(port, false);
4739                 tcpm_set_state(port, hard_reset_state(port),
4740                                PD_T_PS_SOURCE_OFF);
4741                 break;
4742         case PR_SWAP_SNK_SRC_SOURCE_ON:
4743                 tcpm_enable_auto_vbus_discharge(port, true);
4744                 tcpm_set_cc(port, tcpm_rp_cc(port));
4745                 tcpm_set_vbus(port, true);
4746                 /*
4747                  * allow time VBUS ramp-up, must be < tNewSrc
4748                  * Also, this window overlaps with CC debounce as well.
4749                  * So, Wait for the max of two which is PD_T_NEWSRC
4750                  */
4751                 tcpm_set_state(port, PR_SWAP_SNK_SRC_SOURCE_ON_VBUS_RAMPED_UP,
4752                                PD_T_NEWSRC);
4753                 break;
4754         case PR_SWAP_SNK_SRC_SOURCE_ON_VBUS_RAMPED_UP:
4755                 /*
4756                  * USB PD standard, 6.2.1.4:
4757                  * "Subsequent Messages initiated by the Policy Engine,
4758                  * such as the PS_RDY Message sent to indicate that Vbus
4759                  * is ready, will have the Port Power Role field set to
4760                  * Source."
4761                  */
4762                 tcpm_set_pwr_role(port, TYPEC_SOURCE);
4763                 tcpm_pd_send_control(port, PD_CTRL_PS_RDY);
4764                 tcpm_set_state(port, SRC_STARTUP, PD_T_SWAP_SRC_START);
4765                 break;
4766
4767         case VCONN_SWAP_ACCEPT:
4768                 tcpm_pd_send_control(port, PD_CTRL_ACCEPT);
4769                 tcpm_ams_finish(port);
4770                 tcpm_set_state(port, VCONN_SWAP_START, 0);
4771                 break;
4772         case VCONN_SWAP_SEND:
4773                 tcpm_pd_send_control(port, PD_CTRL_VCONN_SWAP);
4774                 tcpm_set_state(port, VCONN_SWAP_SEND_TIMEOUT,
4775                                PD_T_SENDER_RESPONSE);
4776                 break;
4777         case VCONN_SWAP_SEND_TIMEOUT:
4778                 tcpm_swap_complete(port, -ETIMEDOUT);
4779                 tcpm_set_state(port, ready_state(port), 0);
4780                 break;
4781         case VCONN_SWAP_START:
4782                 if (port->vconn_role == TYPEC_SOURCE)
4783                         tcpm_set_state(port, VCONN_SWAP_WAIT_FOR_VCONN, 0);
4784                 else
4785                         tcpm_set_state(port, VCONN_SWAP_TURN_ON_VCONN, 0);
4786                 break;
4787         case VCONN_SWAP_WAIT_FOR_VCONN:
4788                 tcpm_set_state(port, hard_reset_state(port),
4789                                PD_T_VCONN_SOURCE_ON);
4790                 break;
4791         case VCONN_SWAP_TURN_ON_VCONN:
4792                 tcpm_set_vconn(port, true);
4793                 tcpm_pd_send_control(port, PD_CTRL_PS_RDY);
4794                 tcpm_set_state(port, ready_state(port), 0);
4795                 break;
4796         case VCONN_SWAP_TURN_OFF_VCONN:
4797                 tcpm_set_vconn(port, false);
4798                 tcpm_set_state(port, ready_state(port), 0);
4799                 break;
4800
4801         case DR_SWAP_CANCEL:
4802         case PR_SWAP_CANCEL:
4803         case VCONN_SWAP_CANCEL:
4804                 tcpm_swap_complete(port, port->swap_status);
4805                 if (port->pwr_role == TYPEC_SOURCE)
4806                         tcpm_set_state(port, SRC_READY, 0);
4807                 else
4808                         tcpm_set_state(port, SNK_READY, 0);
4809                 break;
4810         case FR_SWAP_CANCEL:
4811                 if (port->pwr_role == TYPEC_SOURCE)
4812                         tcpm_set_state(port, SRC_READY, 0);
4813                 else
4814                         tcpm_set_state(port, SNK_READY, 0);
4815                 break;
4816
4817         case BIST_RX:
4818                 switch (BDO_MODE_MASK(port->bist_request)) {
4819                 case BDO_MODE_CARRIER2:
4820                         tcpm_pd_transmit(port, TCPC_TX_BIST_MODE_2, NULL);
4821                         tcpm_set_state(port, unattached_state(port),
4822                                        PD_T_BIST_CONT_MODE);
4823                         break;
4824                 case BDO_MODE_TESTDATA:
4825                         if (port->tcpc->set_bist_data) {
4826                                 tcpm_log(port, "Enable BIST MODE TESTDATA");
4827                                 port->tcpc->set_bist_data(port->tcpc, true);
4828                         }
4829                         break;
4830                 default:
4831                         break;
4832                 }
4833                 break;
4834         case GET_STATUS_SEND:
4835                 tcpm_pd_send_control(port, PD_CTRL_GET_STATUS);
4836                 tcpm_set_state(port, GET_STATUS_SEND_TIMEOUT,
4837                                PD_T_SENDER_RESPONSE);
4838                 break;
4839         case GET_STATUS_SEND_TIMEOUT:
4840                 tcpm_set_state(port, ready_state(port), 0);
4841                 break;
4842         case GET_PPS_STATUS_SEND:
4843                 tcpm_pd_send_control(port, PD_CTRL_GET_PPS_STATUS);
4844                 tcpm_set_state(port, GET_PPS_STATUS_SEND_TIMEOUT,
4845                                PD_T_SENDER_RESPONSE);
4846                 break;
4847         case GET_PPS_STATUS_SEND_TIMEOUT:
4848                 tcpm_set_state(port, ready_state(port), 0);
4849                 break;
4850         case GET_SINK_CAP:
4851                 tcpm_pd_send_control(port, PD_CTRL_GET_SINK_CAP);
4852                 tcpm_set_state(port, GET_SINK_CAP_TIMEOUT, PD_T_SENDER_RESPONSE);
4853                 break;
4854         case GET_SINK_CAP_TIMEOUT:
4855                 port->sink_cap_done = true;
4856                 tcpm_set_state(port, ready_state(port), 0);
4857                 break;
4858         case ERROR_RECOVERY:
4859                 tcpm_swap_complete(port, -EPROTO);
4860                 tcpm_pps_complete(port, -EPROTO);
4861                 tcpm_set_state(port, PORT_RESET, 0);
4862                 break;
4863         case PORT_RESET:
4864                 tcpm_reset_port(port);
4865                 tcpm_set_cc(port, TYPEC_CC_OPEN);
4866                 tcpm_set_state(port, PORT_RESET_WAIT_OFF,
4867                                PD_T_ERROR_RECOVERY);
4868                 break;
4869         case PORT_RESET_WAIT_OFF:
4870                 tcpm_set_state(port,
4871                                tcpm_default_state(port),
4872                                port->vbus_present ? PD_T_PS_SOURCE_OFF : 0);
4873                 break;
4874
4875         /* AMS intermediate state */
4876         case AMS_START:
4877                 if (port->upcoming_state == INVALID_STATE) {
4878                         tcpm_set_state(port, port->pwr_role == TYPEC_SOURCE ?
4879                                        SRC_READY : SNK_READY, 0);
4880                         break;
4881                 }
4882
4883                 upcoming_state = port->upcoming_state;
4884                 port->upcoming_state = INVALID_STATE;
4885                 tcpm_set_state(port, upcoming_state, 0);
4886                 break;
4887
4888         /* Chunk state */
4889         case CHUNK_NOT_SUPP:
4890                 tcpm_pd_send_control(port, PD_CTRL_NOT_SUPP);
4891                 tcpm_set_state(port, port->pwr_role == TYPEC_SOURCE ? SRC_READY : SNK_READY, 0);
4892                 break;
4893         default:
4894                 WARN(1, "Unexpected port state %d\n", port->state);
4895                 break;
4896         }
4897 }
4898
4899 static void tcpm_state_machine_work(struct kthread_work *work)
4900 {
4901         struct tcpm_port *port = container_of(work, struct tcpm_port, state_machine);
4902         enum tcpm_state prev_state;
4903
4904         mutex_lock(&port->lock);
4905         port->state_machine_running = true;
4906
4907         if (port->queued_message && tcpm_send_queued_message(port))
4908                 goto done;
4909
4910         /* If we were queued due to a delayed state change, update it now */
4911         if (port->delayed_state) {
4912                 tcpm_log(port, "state change %s -> %s [delayed %ld ms]",
4913                          tcpm_states[port->state],
4914                          tcpm_states[port->delayed_state], port->delay_ms);
4915                 port->prev_state = port->state;
4916                 port->state = port->delayed_state;
4917                 port->delayed_state = INVALID_STATE;
4918         }
4919
4920         /*
4921          * Continue running as long as we have (non-delayed) state changes
4922          * to make.
4923          */
4924         do {
4925                 prev_state = port->state;
4926                 run_state_machine(port);
4927                 if (port->queued_message)
4928                         tcpm_send_queued_message(port);
4929         } while (port->state != prev_state && !port->delayed_state);
4930
4931 done:
4932         port->state_machine_running = false;
4933         mutex_unlock(&port->lock);
4934 }
4935
4936 static void _tcpm_cc_change(struct tcpm_port *port, enum typec_cc_status cc1,
4937                             enum typec_cc_status cc2)
4938 {
4939         enum typec_cc_status old_cc1, old_cc2;
4940         enum tcpm_state new_state;
4941
4942         old_cc1 = port->cc1;
4943         old_cc2 = port->cc2;
4944         port->cc1 = cc1;
4945         port->cc2 = cc2;
4946
4947         tcpm_log_force(port,
4948                        "CC1: %u -> %u, CC2: %u -> %u [state %s, polarity %d, %s]",
4949                        old_cc1, cc1, old_cc2, cc2, tcpm_states[port->state],
4950                        port->polarity,
4951                        tcpm_port_is_disconnected(port) ? "disconnected"
4952                                                        : "connected");
4953
4954         switch (port->state) {
4955         case TOGGLING:
4956                 if (tcpm_port_is_debug(port) || tcpm_port_is_audio(port) ||
4957                     tcpm_port_is_source(port))
4958                         tcpm_set_state(port, SRC_ATTACH_WAIT, 0);
4959                 else if (tcpm_port_is_sink(port))
4960                         tcpm_set_state(port, SNK_ATTACH_WAIT, 0);
4961                 break;
4962         case CHECK_CONTAMINANT:
4963                 /* Wait for Toggling to be resumed */
4964                 break;
4965         case SRC_UNATTACHED:
4966         case ACC_UNATTACHED:
4967                 if (tcpm_port_is_debug(port) || tcpm_port_is_audio(port) ||
4968                     tcpm_port_is_source(port))
4969                         tcpm_set_state(port, SRC_ATTACH_WAIT, 0);
4970                 break;
4971         case SRC_ATTACH_WAIT:
4972                 if (tcpm_port_is_disconnected(port) ||
4973                     tcpm_port_is_audio_detached(port))
4974                         tcpm_set_state(port, SRC_UNATTACHED, 0);
4975                 else if (cc1 != old_cc1 || cc2 != old_cc2)
4976                         tcpm_set_state(port, SRC_ATTACH_WAIT, 0);
4977                 break;
4978         case SRC_ATTACHED:
4979         case SRC_STARTUP:
4980         case SRC_SEND_CAPABILITIES:
4981         case SRC_READY:
4982                 if (tcpm_port_is_disconnected(port) ||
4983                     !tcpm_port_is_source(port)) {
4984                         if (port->port_type == TYPEC_PORT_SRC)
4985                                 tcpm_set_state(port, SRC_UNATTACHED, tcpm_wait_for_discharge(port));
4986                         else
4987                                 tcpm_set_state(port, SNK_UNATTACHED, tcpm_wait_for_discharge(port));
4988                 }
4989                 break;
4990         case SNK_UNATTACHED:
4991                 if (tcpm_port_is_sink(port))
4992                         tcpm_set_state(port, SNK_ATTACH_WAIT, 0);
4993                 break;
4994         case SNK_ATTACH_WAIT:
4995                 if ((port->cc1 == TYPEC_CC_OPEN &&
4996                      port->cc2 != TYPEC_CC_OPEN) ||
4997                     (port->cc1 != TYPEC_CC_OPEN &&
4998                      port->cc2 == TYPEC_CC_OPEN))
4999                         new_state = SNK_DEBOUNCED;
5000                 else if (tcpm_port_is_disconnected(port))
5001                         new_state = SNK_UNATTACHED;
5002                 else
5003                         break;
5004                 if (new_state != port->delayed_state)
5005                         tcpm_set_state(port, SNK_ATTACH_WAIT, 0);
5006                 break;
5007         case SNK_DEBOUNCED:
5008                 if (tcpm_port_is_disconnected(port))
5009                         new_state = SNK_UNATTACHED;
5010                 else if (port->vbus_present)
5011                         new_state = tcpm_try_src(port) ? SRC_TRY : SNK_ATTACHED;
5012                 else
5013                         new_state = SNK_UNATTACHED;
5014                 if (new_state != port->delayed_state)
5015                         tcpm_set_state(port, SNK_DEBOUNCED, 0);
5016                 break;
5017         case SNK_READY:
5018                 /*
5019                  * EXIT condition is based primarily on vbus disconnect and CC is secondary.
5020                  * "A port that has entered into USB PD communications with the Source and
5021                  * has seen the CC voltage exceed vRd-USB may monitor the CC pin to detect
5022                  * cable disconnect in addition to monitoring VBUS.
5023                  *
5024                  * A port that is monitoring the CC voltage for disconnect (but is not in
5025                  * the process of a USB PD PR_Swap or USB PD FR_Swap) shall transition to
5026                  * Unattached.SNK within tSinkDisconnect after the CC voltage remains below
5027                  * vRd-USB for tPDDebounce."
5028                  *
5029                  * When set_auto_vbus_discharge_threshold is enabled, CC pins go
5030                  * away before vbus decays to disconnect threshold. Allow
5031                  * disconnect to be driven by vbus disconnect when auto vbus
5032                  * discharge is enabled.
5033                  */
5034                 if (!port->auto_vbus_discharge_enabled && tcpm_port_is_disconnected(port))
5035                         tcpm_set_state(port, unattached_state(port), 0);
5036                 else if (!port->pd_capable &&
5037                          (cc1 != old_cc1 || cc2 != old_cc2))
5038                         tcpm_set_current_limit(port,
5039                                                tcpm_get_current_limit(port),
5040                                                5000);
5041                 break;
5042
5043         case AUDIO_ACC_ATTACHED:
5044                 if (cc1 == TYPEC_CC_OPEN || cc2 == TYPEC_CC_OPEN)
5045                         tcpm_set_state(port, AUDIO_ACC_DEBOUNCE, 0);
5046                 break;
5047         case AUDIO_ACC_DEBOUNCE:
5048                 if (tcpm_port_is_audio(port))
5049                         tcpm_set_state(port, AUDIO_ACC_ATTACHED, 0);
5050                 break;
5051
5052         case DEBUG_ACC_ATTACHED:
5053                 if (cc1 == TYPEC_CC_OPEN || cc2 == TYPEC_CC_OPEN)
5054                         tcpm_set_state(port, ACC_UNATTACHED, 0);
5055                 break;
5056
5057         case SNK_TRY:
5058                 /* Do nothing, waiting for timeout */
5059                 break;
5060
5061         case SNK_DISCOVERY:
5062                 /* CC line is unstable, wait for debounce */
5063                 if (tcpm_port_is_disconnected(port))
5064                         tcpm_set_state(port, SNK_DISCOVERY_DEBOUNCE, 0);
5065                 break;
5066         case SNK_DISCOVERY_DEBOUNCE:
5067                 break;
5068
5069         case SRC_TRYWAIT:
5070                 /* Hand over to state machine if needed */
5071                 if (!port->vbus_present && tcpm_port_is_source(port))
5072                         tcpm_set_state(port, SRC_TRYWAIT_DEBOUNCE, 0);
5073                 break;
5074         case SRC_TRYWAIT_DEBOUNCE:
5075                 if (port->vbus_present || !tcpm_port_is_source(port))
5076                         tcpm_set_state(port, SRC_TRYWAIT, 0);
5077                 break;
5078         case SNK_TRY_WAIT_DEBOUNCE:
5079                 if (!tcpm_port_is_sink(port)) {
5080                         port->max_wait = 0;
5081                         tcpm_set_state(port, SRC_TRYWAIT, 0);
5082                 }
5083                 break;
5084         case SRC_TRY_WAIT:
5085                 if (tcpm_port_is_source(port))
5086                         tcpm_set_state(port, SRC_TRY_DEBOUNCE, 0);
5087                 break;
5088         case SRC_TRY_DEBOUNCE:
5089                 tcpm_set_state(port, SRC_TRY_WAIT, 0);
5090                 break;
5091         case SNK_TRYWAIT_DEBOUNCE:
5092                 if (tcpm_port_is_sink(port))
5093                         tcpm_set_state(port, SNK_TRYWAIT_VBUS, 0);
5094                 break;
5095         case SNK_TRYWAIT_VBUS:
5096                 if (!tcpm_port_is_sink(port))
5097                         tcpm_set_state(port, SNK_TRYWAIT_DEBOUNCE, 0);
5098                 break;
5099         case SNK_TRY_WAIT_DEBOUNCE_CHECK_VBUS:
5100                 if (!tcpm_port_is_sink(port))
5101                         tcpm_set_state(port, SRC_TRYWAIT, PD_T_TRY_CC_DEBOUNCE);
5102                 else
5103                         tcpm_set_state(port, SNK_TRY_WAIT_DEBOUNCE_CHECK_VBUS, 0);
5104                 break;
5105         case SNK_TRYWAIT:
5106                 /* Do nothing, waiting for tCCDebounce */
5107                 break;
5108         case PR_SWAP_SNK_SRC_SINK_OFF:
5109         case PR_SWAP_SRC_SNK_TRANSITION_OFF:
5110         case PR_SWAP_SRC_SNK_SOURCE_OFF:
5111         case PR_SWAP_SRC_SNK_SOURCE_OFF_CC_DEBOUNCED:
5112         case PR_SWAP_SNK_SRC_SOURCE_ON:
5113                 /*
5114                  * CC state change is expected in PR_SWAP
5115                  * Ignore it.
5116                  */
5117                 break;
5118         case FR_SWAP_SEND:
5119         case FR_SWAP_SEND_TIMEOUT:
5120         case FR_SWAP_SNK_SRC_TRANSITION_TO_OFF:
5121         case FR_SWAP_SNK_SRC_NEW_SINK_READY:
5122         case FR_SWAP_SNK_SRC_SOURCE_VBUS_APPLIED:
5123                 /* Do nothing, CC change expected */
5124                 break;
5125
5126         case PORT_RESET:
5127         case PORT_RESET_WAIT_OFF:
5128                 /*
5129                  * State set back to default mode once the timer completes.
5130                  * Ignore CC changes here.
5131                  */
5132                 break;
5133         default:
5134                 /*
5135                  * While acting as sink and auto vbus discharge is enabled, Allow disconnect
5136                  * to be driven by vbus disconnect.
5137                  */
5138                 if (tcpm_port_is_disconnected(port) && !(port->pwr_role == TYPEC_SINK &&
5139                                                          port->auto_vbus_discharge_enabled))
5140                         tcpm_set_state(port, unattached_state(port), 0);
5141                 break;
5142         }
5143 }
5144
5145 static void _tcpm_pd_vbus_on(struct tcpm_port *port)
5146 {
5147         tcpm_log_force(port, "VBUS on");
5148         port->vbus_present = true;
5149         /*
5150          * When vbus_present is true i.e. Voltage at VBUS is greater than VSAFE5V implicitly
5151          * states that vbus is not at VSAFE0V, hence clear the vbus_vsafe0v flag here.
5152          */
5153         port->vbus_vsafe0v = false;
5154
5155         switch (port->state) {
5156         case SNK_TRANSITION_SINK_VBUS:
5157                 port->explicit_contract = true;
5158                 tcpm_set_state(port, SNK_READY, 0);
5159                 break;
5160         case SNK_DISCOVERY:
5161                 tcpm_set_state(port, SNK_DISCOVERY, 0);
5162                 break;
5163
5164         case SNK_DEBOUNCED:
5165                 tcpm_set_state(port, tcpm_try_src(port) ? SRC_TRY
5166                                                         : SNK_ATTACHED,
5167                                        0);
5168                 break;
5169         case SNK_HARD_RESET_WAIT_VBUS:
5170                 tcpm_set_state(port, SNK_HARD_RESET_SINK_ON, 0);
5171                 break;
5172         case SRC_ATTACHED:
5173                 tcpm_set_state(port, SRC_STARTUP, 0);
5174                 break;
5175         case SRC_HARD_RESET_VBUS_ON:
5176                 tcpm_set_state(port, SRC_STARTUP, 0);
5177                 break;
5178
5179         case SNK_TRY:
5180                 /* Do nothing, waiting for timeout */
5181                 break;
5182         case SRC_TRYWAIT:
5183                 /* Do nothing, Waiting for Rd to be detected */
5184                 break;
5185         case SRC_TRYWAIT_DEBOUNCE:
5186                 tcpm_set_state(port, SRC_TRYWAIT, 0);
5187                 break;
5188         case SNK_TRY_WAIT_DEBOUNCE:
5189                 /* Do nothing, waiting for PD_DEBOUNCE to do be done */
5190                 break;
5191         case SNK_TRYWAIT:
5192                 /* Do nothing, waiting for tCCDebounce */
5193                 break;
5194         case SNK_TRYWAIT_VBUS:
5195                 if (tcpm_port_is_sink(port))
5196                         tcpm_set_state(port, SNK_ATTACHED, 0);
5197                 break;
5198         case SNK_TRYWAIT_DEBOUNCE:
5199                 /* Do nothing, waiting for Rp */
5200                 break;
5201         case SNK_TRY_WAIT_DEBOUNCE_CHECK_VBUS:
5202                 if (port->vbus_present && tcpm_port_is_sink(port))
5203                         tcpm_set_state(port, SNK_ATTACHED, 0);
5204                 break;
5205         case SRC_TRY_WAIT:
5206         case SRC_TRY_DEBOUNCE:
5207                 /* Do nothing, waiting for sink detection */
5208                 break;
5209         case FR_SWAP_SEND:
5210         case FR_SWAP_SEND_TIMEOUT:
5211         case FR_SWAP_SNK_SRC_TRANSITION_TO_OFF:
5212         case FR_SWAP_SNK_SRC_SOURCE_VBUS_APPLIED:
5213                 if (port->tcpc->frs_sourcing_vbus)
5214                         port->tcpc->frs_sourcing_vbus(port->tcpc);
5215                 break;
5216         case FR_SWAP_SNK_SRC_NEW_SINK_READY:
5217                 if (port->tcpc->frs_sourcing_vbus)
5218                         port->tcpc->frs_sourcing_vbus(port->tcpc);
5219                 tcpm_set_state(port, FR_SWAP_SNK_SRC_SOURCE_VBUS_APPLIED, 0);
5220                 break;
5221
5222         case PORT_RESET:
5223         case PORT_RESET_WAIT_OFF:
5224                 /*
5225                  * State set back to default mode once the timer completes.
5226                  * Ignore vbus changes here.
5227                  */
5228                 break;
5229
5230         default:
5231                 break;
5232         }
5233 }
5234
5235 static void _tcpm_pd_vbus_off(struct tcpm_port *port)
5236 {
5237         tcpm_log_force(port, "VBUS off");
5238         port->vbus_present = false;
5239         port->vbus_never_low = false;
5240         switch (port->state) {
5241         case SNK_HARD_RESET_SINK_OFF:
5242                 tcpm_set_state(port, SNK_HARD_RESET_WAIT_VBUS, 0);
5243                 break;
5244         case HARD_RESET_SEND:
5245                 break;
5246         case SNK_TRY:
5247                 /* Do nothing, waiting for timeout */
5248                 break;
5249         case SRC_TRYWAIT:
5250                 /* Hand over to state machine if needed */
5251                 if (tcpm_port_is_source(port))
5252                         tcpm_set_state(port, SRC_TRYWAIT_DEBOUNCE, 0);
5253                 break;
5254         case SNK_TRY_WAIT_DEBOUNCE:
5255                 /* Do nothing, waiting for PD_DEBOUNCE to do be done */
5256                 break;
5257         case SNK_TRYWAIT:
5258         case SNK_TRYWAIT_VBUS:
5259         case SNK_TRYWAIT_DEBOUNCE:
5260                 break;
5261         case SNK_ATTACH_WAIT:
5262         case SNK_DEBOUNCED:
5263                 /* Do nothing, as TCPM is still waiting for vbus to reaach VSAFE5V to connect */
5264                 break;
5265
5266         case SNK_NEGOTIATE_CAPABILITIES:
5267                 break;
5268
5269         case PR_SWAP_SRC_SNK_TRANSITION_OFF:
5270                 tcpm_set_state(port, PR_SWAP_SRC_SNK_SOURCE_OFF, 0);
5271                 break;
5272
5273         case PR_SWAP_SNK_SRC_SINK_OFF:
5274                 /* Do nothing, expected */
5275                 break;
5276
5277         case PR_SWAP_SNK_SRC_SOURCE_ON:
5278                 /*
5279                  * Do nothing when vbus off notification is received.
5280                  * TCPM can wait for PD_T_NEWSRC in PR_SWAP_SNK_SRC_SOURCE_ON
5281                  * for the vbus source to ramp up.
5282                  */
5283                 break;
5284
5285         case PORT_RESET_WAIT_OFF:
5286                 tcpm_set_state(port, tcpm_default_state(port), 0);
5287                 break;
5288
5289         case SRC_TRY_WAIT:
5290         case SRC_TRY_DEBOUNCE:
5291                 /* Do nothing, waiting for sink detection */
5292                 break;
5293
5294         case SRC_STARTUP:
5295         case SRC_SEND_CAPABILITIES:
5296         case SRC_SEND_CAPABILITIES_TIMEOUT:
5297         case SRC_NEGOTIATE_CAPABILITIES:
5298         case SRC_TRANSITION_SUPPLY:
5299         case SRC_READY:
5300         case SRC_WAIT_NEW_CAPABILITIES:
5301                 /*
5302                  * Force to unattached state to re-initiate connection.
5303                  * DRP port should move to Unattached.SNK instead of Unattached.SRC if
5304                  * sink removed. Although sink removal here is due to source's vbus collapse,
5305                  * treat it the same way for consistency.
5306                  */
5307                 if (port->port_type == TYPEC_PORT_SRC)
5308                         tcpm_set_state(port, SRC_UNATTACHED, tcpm_wait_for_discharge(port));
5309                 else
5310                         tcpm_set_state(port, SNK_UNATTACHED, tcpm_wait_for_discharge(port));
5311                 break;
5312
5313         case PORT_RESET:
5314                 /*
5315                  * State set back to default mode once the timer completes.
5316                  * Ignore vbus changes here.
5317                  */
5318                 break;
5319
5320         case FR_SWAP_SEND:
5321         case FR_SWAP_SEND_TIMEOUT:
5322         case FR_SWAP_SNK_SRC_TRANSITION_TO_OFF:
5323         case FR_SWAP_SNK_SRC_NEW_SINK_READY:
5324         case FR_SWAP_SNK_SRC_SOURCE_VBUS_APPLIED:
5325                 /* Do nothing, vbus drop expected */
5326                 break;
5327
5328         case SNK_HARD_RESET_WAIT_VBUS:
5329                 /* Do nothing, its OK to receive vbus off events */
5330                 break;
5331
5332         default:
5333                 if (port->pwr_role == TYPEC_SINK && port->attached)
5334                         tcpm_set_state(port, SNK_UNATTACHED, tcpm_wait_for_discharge(port));
5335                 break;
5336         }
5337 }
5338
5339 static void _tcpm_pd_vbus_vsafe0v(struct tcpm_port *port)
5340 {
5341         tcpm_log_force(port, "VBUS VSAFE0V");
5342         port->vbus_vsafe0v = true;
5343         switch (port->state) {
5344         case SRC_HARD_RESET_VBUS_OFF:
5345                 /*
5346                  * After establishing the vSafe0V voltage condition on VBUS, the Source Shall wait
5347                  * tSrcRecover before re-applying VCONN and restoring VBUS to vSafe5V.
5348                  */
5349                 tcpm_set_state(port, SRC_HARD_RESET_VBUS_ON, PD_T_SRC_RECOVER);
5350                 break;
5351         case SRC_ATTACH_WAIT:
5352                 if (tcpm_port_is_source(port))
5353                         tcpm_set_state(port, tcpm_try_snk(port) ? SNK_TRY : SRC_ATTACHED,
5354                                        PD_T_CC_DEBOUNCE);
5355                 break;
5356         case SRC_STARTUP:
5357         case SRC_SEND_CAPABILITIES:
5358         case SRC_SEND_CAPABILITIES_TIMEOUT:
5359         case SRC_NEGOTIATE_CAPABILITIES:
5360         case SRC_TRANSITION_SUPPLY:
5361         case SRC_READY:
5362         case SRC_WAIT_NEW_CAPABILITIES:
5363                 if (port->auto_vbus_discharge_enabled) {
5364                         if (port->port_type == TYPEC_PORT_SRC)
5365                                 tcpm_set_state(port, SRC_UNATTACHED, 0);
5366                         else
5367                                 tcpm_set_state(port, SNK_UNATTACHED, 0);
5368                 }
5369                 break;
5370         case PR_SWAP_SNK_SRC_SINK_OFF:
5371         case PR_SWAP_SNK_SRC_SOURCE_ON:
5372                 /* Do nothing, vsafe0v is expected during transition */
5373                 break;
5374         case SNK_ATTACH_WAIT:
5375         case SNK_DEBOUNCED:
5376                 /*Do nothing, still waiting for VSAFE5V for connect */
5377                 break;
5378         case SNK_HARD_RESET_WAIT_VBUS:
5379                 /* Do nothing, its OK to receive vbus off events */
5380                 break;
5381         default:
5382                 if (port->pwr_role == TYPEC_SINK && port->auto_vbus_discharge_enabled)
5383                         tcpm_set_state(port, SNK_UNATTACHED, 0);
5384                 break;
5385         }
5386 }
5387
5388 static void _tcpm_pd_hard_reset(struct tcpm_port *port)
5389 {
5390         tcpm_log_force(port, "Received hard reset");
5391         if (port->bist_request == BDO_MODE_TESTDATA && port->tcpc->set_bist_data)
5392                 port->tcpc->set_bist_data(port->tcpc, false);
5393
5394         switch (port->state) {
5395         case ERROR_RECOVERY:
5396         case PORT_RESET:
5397         case PORT_RESET_WAIT_OFF:
5398                 return;
5399         default:
5400                 break;
5401         }
5402
5403         if (port->ams != NONE_AMS)
5404                 port->ams = NONE_AMS;
5405         if (port->hard_reset_count < PD_N_HARD_RESET_COUNT)
5406                 port->ams = HARD_RESET;
5407         /*
5408          * If we keep receiving hard reset requests, executing the hard reset
5409          * must have failed. Revert to error recovery if that happens.
5410          */
5411         tcpm_set_state(port,
5412                        port->hard_reset_count < PD_N_HARD_RESET_COUNT ?
5413                                 HARD_RESET_START : ERROR_RECOVERY,
5414                        0);
5415 }
5416
5417 static void tcpm_pd_event_handler(struct kthread_work *work)
5418 {
5419         struct tcpm_port *port = container_of(work, struct tcpm_port,
5420                                               event_work);
5421         u32 events;
5422
5423         mutex_lock(&port->lock);
5424
5425         spin_lock(&port->pd_event_lock);
5426         while (port->pd_events) {
5427                 events = port->pd_events;
5428                 port->pd_events = 0;
5429                 spin_unlock(&port->pd_event_lock);
5430                 if (events & TCPM_RESET_EVENT)
5431                         _tcpm_pd_hard_reset(port);
5432                 if (events & TCPM_VBUS_EVENT) {
5433                         bool vbus;
5434
5435                         vbus = port->tcpc->get_vbus(port->tcpc);
5436                         if (vbus) {
5437                                 _tcpm_pd_vbus_on(port);
5438                         } else {
5439                                 _tcpm_pd_vbus_off(port);
5440                                 /*
5441                                  * When TCPC does not support detecting vsafe0v voltage level,
5442                                  * treat vbus absent as vsafe0v. Else invoke is_vbus_vsafe0v
5443                                  * to see if vbus has discharge to VSAFE0V.
5444                                  */
5445                                 if (!port->tcpc->is_vbus_vsafe0v ||
5446                                     port->tcpc->is_vbus_vsafe0v(port->tcpc))
5447                                         _tcpm_pd_vbus_vsafe0v(port);
5448                         }
5449                 }
5450                 if (events & TCPM_CC_EVENT) {
5451                         enum typec_cc_status cc1, cc2;
5452
5453                         if (port->tcpc->get_cc(port->tcpc, &cc1, &cc2) == 0)
5454                                 _tcpm_cc_change(port, cc1, cc2);
5455                 }
5456                 if (events & TCPM_FRS_EVENT) {
5457                         if (port->state == SNK_READY) {
5458                                 int ret;
5459
5460                                 port->upcoming_state = FR_SWAP_SEND;
5461                                 ret = tcpm_ams_start(port, FAST_ROLE_SWAP);
5462                                 if (ret == -EAGAIN)
5463                                         port->upcoming_state = INVALID_STATE;
5464                         } else {
5465                                 tcpm_log(port, "Discarding FRS_SIGNAL! Not in sink ready");
5466                         }
5467                 }
5468                 if (events & TCPM_SOURCING_VBUS) {
5469                         tcpm_log(port, "sourcing vbus");
5470                         /*
5471                          * In fast role swap case TCPC autonomously sources vbus. Set vbus_source
5472                          * true as TCPM wouldn't have called tcpm_set_vbus.
5473                          *
5474                          * When vbus is sourced on the command on TCPM i.e. TCPM called
5475                          * tcpm_set_vbus to source vbus, vbus_source would already be true.
5476                          */
5477                         port->vbus_source = true;
5478                         _tcpm_pd_vbus_on(port);
5479                 }
5480                 if (events & TCPM_PORT_CLEAN) {
5481                         tcpm_log(port, "port clean");
5482                         if (port->state == CHECK_CONTAMINANT) {
5483                                 if (tcpm_start_toggling(port, tcpm_rp_cc(port)))
5484                                         tcpm_set_state(port, TOGGLING, 0);
5485                                 else
5486                                         tcpm_set_state(port, tcpm_default_state(port), 0);
5487                         }
5488                 }
5489
5490                 spin_lock(&port->pd_event_lock);
5491         }
5492         spin_unlock(&port->pd_event_lock);
5493         mutex_unlock(&port->lock);
5494 }
5495
5496 void tcpm_cc_change(struct tcpm_port *port)
5497 {
5498         spin_lock(&port->pd_event_lock);
5499         port->pd_events |= TCPM_CC_EVENT;
5500         spin_unlock(&port->pd_event_lock);
5501         kthread_queue_work(port->wq, &port->event_work);
5502 }
5503 EXPORT_SYMBOL_GPL(tcpm_cc_change);
5504
5505 void tcpm_vbus_change(struct tcpm_port *port)
5506 {
5507         spin_lock(&port->pd_event_lock);
5508         port->pd_events |= TCPM_VBUS_EVENT;
5509         spin_unlock(&port->pd_event_lock);
5510         kthread_queue_work(port->wq, &port->event_work);
5511 }
5512 EXPORT_SYMBOL_GPL(tcpm_vbus_change);
5513
5514 void tcpm_pd_hard_reset(struct tcpm_port *port)
5515 {
5516         spin_lock(&port->pd_event_lock);
5517         port->pd_events = TCPM_RESET_EVENT;
5518         spin_unlock(&port->pd_event_lock);
5519         kthread_queue_work(port->wq, &port->event_work);
5520 }
5521 EXPORT_SYMBOL_GPL(tcpm_pd_hard_reset);
5522
5523 void tcpm_sink_frs(struct tcpm_port *port)
5524 {
5525         spin_lock(&port->pd_event_lock);
5526         port->pd_events |= TCPM_FRS_EVENT;
5527         spin_unlock(&port->pd_event_lock);
5528         kthread_queue_work(port->wq, &port->event_work);
5529 }
5530 EXPORT_SYMBOL_GPL(tcpm_sink_frs);
5531
5532 void tcpm_sourcing_vbus(struct tcpm_port *port)
5533 {
5534         spin_lock(&port->pd_event_lock);
5535         port->pd_events |= TCPM_SOURCING_VBUS;
5536         spin_unlock(&port->pd_event_lock);
5537         kthread_queue_work(port->wq, &port->event_work);
5538 }
5539 EXPORT_SYMBOL_GPL(tcpm_sourcing_vbus);
5540
5541 void tcpm_port_clean(struct tcpm_port *port)
5542 {
5543         spin_lock(&port->pd_event_lock);
5544         port->pd_events |= TCPM_PORT_CLEAN;
5545         spin_unlock(&port->pd_event_lock);
5546         kthread_queue_work(port->wq, &port->event_work);
5547 }
5548 EXPORT_SYMBOL_GPL(tcpm_port_clean);
5549
5550 bool tcpm_port_is_toggling(struct tcpm_port *port)
5551 {
5552         return port->port_type == TYPEC_PORT_DRP && port->state == TOGGLING;
5553 }
5554 EXPORT_SYMBOL_GPL(tcpm_port_is_toggling);
5555
5556 static void tcpm_enable_frs_work(struct kthread_work *work)
5557 {
5558         struct tcpm_port *port = container_of(work, struct tcpm_port, enable_frs);
5559         int ret;
5560
5561         mutex_lock(&port->lock);
5562         /* Not FRS capable */
5563         if (!port->connected || port->port_type != TYPEC_PORT_DRP ||
5564             port->pwr_opmode != TYPEC_PWR_MODE_PD ||
5565             !port->tcpc->enable_frs ||
5566             /* Sink caps queried */
5567             port->sink_cap_done || port->negotiated_rev < PD_REV30)
5568                 goto unlock;
5569
5570         /* Send when the state machine is idle */
5571         if (port->state != SNK_READY || port->vdm_sm_running || port->send_discover)
5572                 goto resched;
5573
5574         port->upcoming_state = GET_SINK_CAP;
5575         ret = tcpm_ams_start(port, GET_SINK_CAPABILITIES);
5576         if (ret == -EAGAIN) {
5577                 port->upcoming_state = INVALID_STATE;
5578         } else {
5579                 port->sink_cap_done = true;
5580                 goto unlock;
5581         }
5582 resched:
5583         mod_enable_frs_delayed_work(port, GET_SINK_CAP_RETRY_MS);
5584 unlock:
5585         mutex_unlock(&port->lock);
5586 }
5587
5588 static void tcpm_send_discover_work(struct kthread_work *work)
5589 {
5590         struct tcpm_port *port = container_of(work, struct tcpm_port, send_discover_work);
5591
5592         mutex_lock(&port->lock);
5593         /* No need to send DISCOVER_IDENTITY anymore */
5594         if (!port->send_discover)
5595                 goto unlock;
5596
5597         if (port->data_role == TYPEC_DEVICE && port->negotiated_rev < PD_REV30) {
5598                 port->send_discover = false;
5599                 goto unlock;
5600         }
5601
5602         /* Retry if the port is not idle */
5603         if ((port->state != SRC_READY && port->state != SNK_READY) || port->vdm_sm_running) {
5604                 mod_send_discover_delayed_work(port, SEND_DISCOVER_RETRY_MS);
5605                 goto unlock;
5606         }
5607
5608         tcpm_send_vdm(port, USB_SID_PD, CMD_DISCOVER_IDENT, NULL, 0);
5609
5610 unlock:
5611         mutex_unlock(&port->lock);
5612 }
5613
5614 static int tcpm_dr_set(struct typec_port *p, enum typec_data_role data)
5615 {
5616         struct tcpm_port *port = typec_get_drvdata(p);
5617         int ret;
5618
5619         mutex_lock(&port->swap_lock);
5620         mutex_lock(&port->lock);
5621
5622         if (port->typec_caps.data != TYPEC_PORT_DRD) {
5623                 ret = -EINVAL;
5624                 goto port_unlock;
5625         }
5626         if (port->state != SRC_READY && port->state != SNK_READY) {
5627                 ret = -EAGAIN;
5628                 goto port_unlock;
5629         }
5630
5631         if (port->data_role == data) {
5632                 ret = 0;
5633                 goto port_unlock;
5634         }
5635
5636         /*
5637          * XXX
5638          * 6.3.9: If an alternate mode is active, a request to swap
5639          * alternate modes shall trigger a port reset.
5640          * Reject data role swap request in this case.
5641          */
5642
5643         if (!port->pd_capable) {
5644                 /*
5645                  * If the partner is not PD capable, reset the port to
5646                  * trigger a role change. This can only work if a preferred
5647                  * role is configured, and if it matches the requested role.
5648                  */
5649                 if (port->try_role == TYPEC_NO_PREFERRED_ROLE ||
5650                     port->try_role == port->pwr_role) {
5651                         ret = -EINVAL;
5652                         goto port_unlock;
5653                 }
5654                 port->non_pd_role_swap = true;
5655                 tcpm_set_state(port, PORT_RESET, 0);
5656         } else {
5657                 port->upcoming_state = DR_SWAP_SEND;
5658                 ret = tcpm_ams_start(port, DATA_ROLE_SWAP);
5659                 if (ret == -EAGAIN) {
5660                         port->upcoming_state = INVALID_STATE;
5661                         goto port_unlock;
5662                 }
5663         }
5664
5665         port->swap_status = 0;
5666         port->swap_pending = true;
5667         reinit_completion(&port->swap_complete);
5668         mutex_unlock(&port->lock);
5669
5670         if (!wait_for_completion_timeout(&port->swap_complete,
5671                                 msecs_to_jiffies(PD_ROLE_SWAP_TIMEOUT)))
5672                 ret = -ETIMEDOUT;
5673         else
5674                 ret = port->swap_status;
5675
5676         port->non_pd_role_swap = false;
5677         goto swap_unlock;
5678
5679 port_unlock:
5680         mutex_unlock(&port->lock);
5681 swap_unlock:
5682         mutex_unlock(&port->swap_lock);
5683         return ret;
5684 }
5685
5686 static int tcpm_pr_set(struct typec_port *p, enum typec_role role)
5687 {
5688         struct tcpm_port *port = typec_get_drvdata(p);
5689         int ret;
5690
5691         mutex_lock(&port->swap_lock);
5692         mutex_lock(&port->lock);
5693
5694         if (port->port_type != TYPEC_PORT_DRP) {
5695                 ret = -EINVAL;
5696                 goto port_unlock;
5697         }
5698         if (port->state != SRC_READY && port->state != SNK_READY) {
5699                 ret = -EAGAIN;
5700                 goto port_unlock;
5701         }
5702
5703         if (role == port->pwr_role) {
5704                 ret = 0;
5705                 goto port_unlock;
5706         }
5707
5708         port->upcoming_state = PR_SWAP_SEND;
5709         ret = tcpm_ams_start(port, POWER_ROLE_SWAP);
5710         if (ret == -EAGAIN) {
5711                 port->upcoming_state = INVALID_STATE;
5712                 goto port_unlock;
5713         }
5714
5715         port->swap_status = 0;
5716         port->swap_pending = true;
5717         reinit_completion(&port->swap_complete);
5718         mutex_unlock(&port->lock);
5719
5720         if (!wait_for_completion_timeout(&port->swap_complete,
5721                                 msecs_to_jiffies(PD_ROLE_SWAP_TIMEOUT)))
5722                 ret = -ETIMEDOUT;
5723         else
5724                 ret = port->swap_status;
5725
5726         goto swap_unlock;
5727
5728 port_unlock:
5729         mutex_unlock(&port->lock);
5730 swap_unlock:
5731         mutex_unlock(&port->swap_lock);
5732         return ret;
5733 }
5734
5735 static int tcpm_vconn_set(struct typec_port *p, enum typec_role role)
5736 {
5737         struct tcpm_port *port = typec_get_drvdata(p);
5738         int ret;
5739
5740         mutex_lock(&port->swap_lock);
5741         mutex_lock(&port->lock);
5742
5743         if (port->state != SRC_READY && port->state != SNK_READY) {
5744                 ret = -EAGAIN;
5745                 goto port_unlock;
5746         }
5747
5748         if (role == port->vconn_role) {
5749                 ret = 0;
5750                 goto port_unlock;
5751         }
5752
5753         port->upcoming_state = VCONN_SWAP_SEND;
5754         ret = tcpm_ams_start(port, VCONN_SWAP);
5755         if (ret == -EAGAIN) {
5756                 port->upcoming_state = INVALID_STATE;
5757                 goto port_unlock;
5758         }
5759
5760         port->swap_status = 0;
5761         port->swap_pending = true;
5762         reinit_completion(&port->swap_complete);
5763         mutex_unlock(&port->lock);
5764
5765         if (!wait_for_completion_timeout(&port->swap_complete,
5766                                 msecs_to_jiffies(PD_ROLE_SWAP_TIMEOUT)))
5767                 ret = -ETIMEDOUT;
5768         else
5769                 ret = port->swap_status;
5770
5771         goto swap_unlock;
5772
5773 port_unlock:
5774         mutex_unlock(&port->lock);
5775 swap_unlock:
5776         mutex_unlock(&port->swap_lock);
5777         return ret;
5778 }
5779
5780 static int tcpm_try_role(struct typec_port *p, int role)
5781 {
5782         struct tcpm_port *port = typec_get_drvdata(p);
5783         struct tcpc_dev *tcpc = port->tcpc;
5784         int ret = 0;
5785
5786         mutex_lock(&port->lock);
5787         if (tcpc->try_role)
5788                 ret = tcpc->try_role(tcpc, role);
5789         if (!ret)
5790                 port->try_role = role;
5791         port->try_src_count = 0;
5792         port->try_snk_count = 0;
5793         mutex_unlock(&port->lock);
5794
5795         return ret;
5796 }
5797
5798 static int tcpm_pps_set_op_curr(struct tcpm_port *port, u16 req_op_curr)
5799 {
5800         unsigned int target_mw;
5801         int ret;
5802
5803         mutex_lock(&port->swap_lock);
5804         mutex_lock(&port->lock);
5805
5806         if (!port->pps_data.active) {
5807                 ret = -EOPNOTSUPP;
5808                 goto port_unlock;
5809         }
5810
5811         if (port->state != SNK_READY) {
5812                 ret = -EAGAIN;
5813                 goto port_unlock;
5814         }
5815
5816         if (req_op_curr > port->pps_data.max_curr) {
5817                 ret = -EINVAL;
5818                 goto port_unlock;
5819         }
5820
5821         target_mw = (req_op_curr * port->supply_voltage) / 1000;
5822         if (target_mw < port->operating_snk_mw) {
5823                 ret = -EINVAL;
5824                 goto port_unlock;
5825         }
5826
5827         port->upcoming_state = SNK_NEGOTIATE_PPS_CAPABILITIES;
5828         ret = tcpm_ams_start(port, POWER_NEGOTIATION);
5829         if (ret == -EAGAIN) {
5830                 port->upcoming_state = INVALID_STATE;
5831                 goto port_unlock;
5832         }
5833
5834         /* Round down operating current to align with PPS valid steps */
5835         req_op_curr = req_op_curr - (req_op_curr % RDO_PROG_CURR_MA_STEP);
5836
5837         reinit_completion(&port->pps_complete);
5838         port->pps_data.req_op_curr = req_op_curr;
5839         port->pps_status = 0;
5840         port->pps_pending = true;
5841         mutex_unlock(&port->lock);
5842
5843         if (!wait_for_completion_timeout(&port->pps_complete,
5844                                 msecs_to_jiffies(PD_PPS_CTRL_TIMEOUT)))
5845                 ret = -ETIMEDOUT;
5846         else
5847                 ret = port->pps_status;
5848
5849         goto swap_unlock;
5850
5851 port_unlock:
5852         mutex_unlock(&port->lock);
5853 swap_unlock:
5854         mutex_unlock(&port->swap_lock);
5855
5856         return ret;
5857 }
5858
5859 static int tcpm_pps_set_out_volt(struct tcpm_port *port, u16 req_out_volt)
5860 {
5861         unsigned int target_mw;
5862         int ret;
5863
5864         mutex_lock(&port->swap_lock);
5865         mutex_lock(&port->lock);
5866
5867         if (!port->pps_data.active) {
5868                 ret = -EOPNOTSUPP;
5869                 goto port_unlock;
5870         }
5871
5872         if (port->state != SNK_READY) {
5873                 ret = -EAGAIN;
5874                 goto port_unlock;
5875         }
5876
5877         target_mw = (port->current_limit * req_out_volt) / 1000;
5878         if (target_mw < port->operating_snk_mw) {
5879                 ret = -EINVAL;
5880                 goto port_unlock;
5881         }
5882
5883         port->upcoming_state = SNK_NEGOTIATE_PPS_CAPABILITIES;
5884         ret = tcpm_ams_start(port, POWER_NEGOTIATION);
5885         if (ret == -EAGAIN) {
5886                 port->upcoming_state = INVALID_STATE;
5887                 goto port_unlock;
5888         }
5889
5890         /* Round down output voltage to align with PPS valid steps */
5891         req_out_volt = req_out_volt - (req_out_volt % RDO_PROG_VOLT_MV_STEP);
5892
5893         reinit_completion(&port->pps_complete);
5894         port->pps_data.req_out_volt = req_out_volt;
5895         port->pps_status = 0;
5896         port->pps_pending = true;
5897         mutex_unlock(&port->lock);
5898
5899         if (!wait_for_completion_timeout(&port->pps_complete,
5900                                 msecs_to_jiffies(PD_PPS_CTRL_TIMEOUT)))
5901                 ret = -ETIMEDOUT;
5902         else
5903                 ret = port->pps_status;
5904
5905         goto swap_unlock;
5906
5907 port_unlock:
5908         mutex_unlock(&port->lock);
5909 swap_unlock:
5910         mutex_unlock(&port->swap_lock);
5911
5912         return ret;
5913 }
5914
5915 static int tcpm_pps_activate(struct tcpm_port *port, bool activate)
5916 {
5917         int ret = 0;
5918
5919         mutex_lock(&port->swap_lock);
5920         mutex_lock(&port->lock);
5921
5922         if (!port->pps_data.supported) {
5923                 ret = -EOPNOTSUPP;
5924                 goto port_unlock;
5925         }
5926
5927         /* Trying to deactivate PPS when already deactivated so just bail */
5928         if (!port->pps_data.active && !activate)
5929                 goto port_unlock;
5930
5931         if (port->state != SNK_READY) {
5932                 ret = -EAGAIN;
5933                 goto port_unlock;
5934         }
5935
5936         if (activate)
5937                 port->upcoming_state = SNK_NEGOTIATE_PPS_CAPABILITIES;
5938         else
5939                 port->upcoming_state = SNK_NEGOTIATE_CAPABILITIES;
5940         ret = tcpm_ams_start(port, POWER_NEGOTIATION);
5941         if (ret == -EAGAIN) {
5942                 port->upcoming_state = INVALID_STATE;
5943                 goto port_unlock;
5944         }
5945
5946         reinit_completion(&port->pps_complete);
5947         port->pps_status = 0;
5948         port->pps_pending = true;
5949
5950         /* Trigger PPS request or move back to standard PDO contract */
5951         if (activate) {
5952                 port->pps_data.req_out_volt = port->supply_voltage;
5953                 port->pps_data.req_op_curr = port->current_limit;
5954         }
5955         mutex_unlock(&port->lock);
5956
5957         if (!wait_for_completion_timeout(&port->pps_complete,
5958                                 msecs_to_jiffies(PD_PPS_CTRL_TIMEOUT)))
5959                 ret = -ETIMEDOUT;
5960         else
5961                 ret = port->pps_status;
5962
5963         goto swap_unlock;
5964
5965 port_unlock:
5966         mutex_unlock(&port->lock);
5967 swap_unlock:
5968         mutex_unlock(&port->swap_lock);
5969
5970         return ret;
5971 }
5972
5973 static void tcpm_init(struct tcpm_port *port)
5974 {
5975         enum typec_cc_status cc1, cc2;
5976
5977         port->tcpc->init(port->tcpc);
5978
5979         tcpm_reset_port(port);
5980
5981         /*
5982          * XXX
5983          * Should possibly wait for VBUS to settle if it was enabled locally
5984          * since tcpm_reset_port() will disable VBUS.
5985          */
5986         port->vbus_present = port->tcpc->get_vbus(port->tcpc);
5987         if (port->vbus_present)
5988                 port->vbus_never_low = true;
5989
5990         /*
5991          * 1. When vbus_present is true, voltage on VBUS is already at VSAFE5V.
5992          * So implicitly vbus_vsafe0v = false.
5993          *
5994          * 2. When vbus_present is false and TCPC does NOT support querying
5995          * vsafe0v status, then, it's best to assume vbus is at VSAFE0V i.e.
5996          * vbus_vsafe0v is true.
5997          *
5998          * 3. When vbus_present is false and TCPC does support querying vsafe0v,
5999          * then, query tcpc for vsafe0v status.
6000          */
6001         if (port->vbus_present)
6002                 port->vbus_vsafe0v = false;
6003         else if (!port->tcpc->is_vbus_vsafe0v)
6004                 port->vbus_vsafe0v = true;
6005         else
6006                 port->vbus_vsafe0v = port->tcpc->is_vbus_vsafe0v(port->tcpc);
6007
6008         tcpm_set_state(port, tcpm_default_state(port), 0);
6009
6010         if (port->tcpc->get_cc(port->tcpc, &cc1, &cc2) == 0)
6011                 _tcpm_cc_change(port, cc1, cc2);
6012
6013         /*
6014          * Some adapters need a clean slate at startup, and won't recover
6015          * otherwise. So do not try to be fancy and force a clean disconnect.
6016          */
6017         tcpm_set_state(port, PORT_RESET, 0);
6018 }
6019
6020 static int tcpm_port_type_set(struct typec_port *p, enum typec_port_type type)
6021 {
6022         struct tcpm_port *port = typec_get_drvdata(p);
6023
6024         mutex_lock(&port->lock);
6025         if (type == port->port_type)
6026                 goto port_unlock;
6027
6028         port->port_type = type;
6029
6030         if (!port->connected) {
6031                 tcpm_set_state(port, PORT_RESET, 0);
6032         } else if (type == TYPEC_PORT_SNK) {
6033                 if (!(port->pwr_role == TYPEC_SINK &&
6034                       port->data_role == TYPEC_DEVICE))
6035                         tcpm_set_state(port, PORT_RESET, 0);
6036         } else if (type == TYPEC_PORT_SRC) {
6037                 if (!(port->pwr_role == TYPEC_SOURCE &&
6038                       port->data_role == TYPEC_HOST))
6039                         tcpm_set_state(port, PORT_RESET, 0);
6040         }
6041
6042 port_unlock:
6043         mutex_unlock(&port->lock);
6044         return 0;
6045 }
6046
6047 static const struct typec_operations tcpm_ops = {
6048         .try_role = tcpm_try_role,
6049         .dr_set = tcpm_dr_set,
6050         .pr_set = tcpm_pr_set,
6051         .vconn_set = tcpm_vconn_set,
6052         .port_type_set = tcpm_port_type_set
6053 };
6054
6055 void tcpm_tcpc_reset(struct tcpm_port *port)
6056 {
6057         mutex_lock(&port->lock);
6058         /* XXX: Maintain PD connection if possible? */
6059         tcpm_init(port);
6060         mutex_unlock(&port->lock);
6061 }
6062 EXPORT_SYMBOL_GPL(tcpm_tcpc_reset);
6063
6064 static void tcpm_port_unregister_pd(struct tcpm_port *port)
6065 {
6066         usb_power_delivery_unregister_capabilities(port->port_sink_caps);
6067         port->port_sink_caps = NULL;
6068         usb_power_delivery_unregister_capabilities(port->port_source_caps);
6069         port->port_source_caps = NULL;
6070         usb_power_delivery_unregister(port->pd);
6071         port->pd = NULL;
6072 }
6073
6074 static int tcpm_port_register_pd(struct tcpm_port *port)
6075 {
6076         struct usb_power_delivery_desc desc = { port->typec_caps.pd_revision };
6077         struct usb_power_delivery_capabilities_desc caps = { };
6078         struct usb_power_delivery_capabilities *cap;
6079         int ret;
6080
6081         if (!port->nr_src_pdo && !port->nr_snk_pdo)
6082                 return 0;
6083
6084         port->pd = usb_power_delivery_register(port->dev, &desc);
6085         if (IS_ERR(port->pd)) {
6086                 ret = PTR_ERR(port->pd);
6087                 goto err_unregister;
6088         }
6089
6090         if (port->nr_src_pdo) {
6091                 memcpy_and_pad(caps.pdo, sizeof(caps.pdo), port->src_pdo,
6092                                port->nr_src_pdo * sizeof(u32), 0);
6093                 caps.role = TYPEC_SOURCE;
6094
6095                 cap = usb_power_delivery_register_capabilities(port->pd, &caps);
6096                 if (IS_ERR(cap)) {
6097                         ret = PTR_ERR(cap);
6098                         goto err_unregister;
6099                 }
6100
6101                 port->port_source_caps = cap;
6102         }
6103
6104         if (port->nr_snk_pdo) {
6105                 memcpy_and_pad(caps.pdo, sizeof(caps.pdo), port->snk_pdo,
6106                                port->nr_snk_pdo * sizeof(u32), 0);
6107                 caps.role = TYPEC_SINK;
6108
6109                 cap = usb_power_delivery_register_capabilities(port->pd, &caps);
6110                 if (IS_ERR(cap)) {
6111                         ret = PTR_ERR(cap);
6112                         goto err_unregister;
6113                 }
6114
6115                 port->port_sink_caps = cap;
6116         }
6117
6118         return 0;
6119
6120 err_unregister:
6121         tcpm_port_unregister_pd(port);
6122
6123         return ret;
6124 }
6125
6126 static int tcpm_fw_get_caps(struct tcpm_port *port,
6127                             struct fwnode_handle *fwnode)
6128 {
6129         const char *opmode_str;
6130         int ret;
6131         u32 mw, frs_current;
6132
6133         if (!fwnode)
6134                 return -EINVAL;
6135
6136         /*
6137          * This fwnode has a "compatible" property, but is never populated as a
6138          * struct device. Instead we simply parse it to read the properties.
6139          * This it breaks fw_devlink=on. To maintain backward compatibility
6140          * with existing DT files, we work around this by deleting any
6141          * fwnode_links to/from this fwnode.
6142          */
6143         fw_devlink_purge_absent_suppliers(fwnode);
6144
6145         ret = typec_get_fw_cap(&port->typec_caps, fwnode);
6146         if (ret < 0)
6147                 return ret;
6148
6149         port->port_type = port->typec_caps.type;
6150         port->pd_supported = !fwnode_property_read_bool(fwnode, "pd-disable");
6151
6152         port->slow_charger_loop = fwnode_property_read_bool(fwnode, "slow-charger-loop");
6153         if (port->port_type == TYPEC_PORT_SNK)
6154                 goto sink;
6155
6156         /* Get Source PDOs for the PD port or Source Rp value for the non-PD port */
6157         if (port->pd_supported) {
6158                 ret = fwnode_property_count_u32(fwnode, "source-pdos");
6159                 if (ret == 0)
6160                         return -EINVAL;
6161                 else if (ret < 0)
6162                         return ret;
6163
6164                 port->nr_src_pdo = min(ret, PDO_MAX_OBJECTS);
6165                 ret = fwnode_property_read_u32_array(fwnode, "source-pdos",
6166                                                      port->src_pdo, port->nr_src_pdo);
6167                 if (ret)
6168                         return ret;
6169                 ret = tcpm_validate_caps(port, port->src_pdo, port->nr_src_pdo);
6170                 if (ret)
6171                         return ret;
6172         } else {
6173                 ret = fwnode_property_read_string(fwnode, "typec-power-opmode", &opmode_str);
6174                 if (ret)
6175                         return ret;
6176                 ret = typec_find_pwr_opmode(opmode_str);
6177                 if (ret < 0)
6178                         return ret;
6179                 port->src_rp = tcpm_pwr_opmode_to_rp(ret);
6180         }
6181
6182         if (port->port_type == TYPEC_PORT_SRC)
6183                 return 0;
6184
6185 sink:
6186         port->self_powered = fwnode_property_read_bool(fwnode, "self-powered");
6187
6188         if (!port->pd_supported)
6189                 return 0;
6190
6191         /* Get sink pdos */
6192         ret = fwnode_property_count_u32(fwnode, "sink-pdos");
6193         if (ret <= 0)
6194                 return -EINVAL;
6195
6196         port->nr_snk_pdo = min(ret, PDO_MAX_OBJECTS);
6197         ret = fwnode_property_read_u32_array(fwnode, "sink-pdos",
6198                                              port->snk_pdo, port->nr_snk_pdo);
6199         if ((ret < 0) || tcpm_validate_caps(port, port->snk_pdo,
6200                                             port->nr_snk_pdo))
6201                 return -EINVAL;
6202
6203         if (fwnode_property_read_u32(fwnode, "op-sink-microwatt", &mw) < 0)
6204                 return -EINVAL;
6205         port->operating_snk_mw = mw / 1000;
6206
6207         /* FRS can only be supported by DRP ports */
6208         if (port->port_type == TYPEC_PORT_DRP) {
6209                 ret = fwnode_property_read_u32(fwnode, "new-source-frs-typec-current",
6210                                                &frs_current);
6211                 if (ret >= 0 && frs_current <= FRS_5V_3A)
6212                         port->new_source_frs_current = frs_current;
6213         }
6214
6215         /* sink-vdos is optional */
6216         ret = fwnode_property_count_u32(fwnode, "sink-vdos");
6217         if (ret < 0)
6218                 ret = 0;
6219
6220         port->nr_snk_vdo = min(ret, VDO_MAX_OBJECTS);
6221         if (port->nr_snk_vdo) {
6222                 ret = fwnode_property_read_u32_array(fwnode, "sink-vdos",
6223                                                      port->snk_vdo,
6224                                                      port->nr_snk_vdo);
6225                 if (ret < 0)
6226                         return ret;
6227         }
6228
6229         /* If sink-vdos is found, sink-vdos-v1 is expected for backward compatibility. */
6230         if (port->nr_snk_vdo) {
6231                 ret = fwnode_property_count_u32(fwnode, "sink-vdos-v1");
6232                 if (ret < 0)
6233                         return ret;
6234                 else if (ret == 0)
6235                         return -ENODATA;
6236
6237                 port->nr_snk_vdo_v1 = min(ret, VDO_MAX_OBJECTS);
6238                 ret = fwnode_property_read_u32_array(fwnode, "sink-vdos-v1",
6239                                                      port->snk_vdo_v1,
6240                                                      port->nr_snk_vdo_v1);
6241                 if (ret < 0)
6242                         return ret;
6243         }
6244
6245         return 0;
6246 }
6247
6248 /* Power Supply access to expose source power information */
6249 enum tcpm_psy_online_states {
6250         TCPM_PSY_OFFLINE = 0,
6251         TCPM_PSY_FIXED_ONLINE,
6252         TCPM_PSY_PROG_ONLINE,
6253 };
6254
6255 static enum power_supply_property tcpm_psy_props[] = {
6256         POWER_SUPPLY_PROP_USB_TYPE,
6257         POWER_SUPPLY_PROP_ONLINE,
6258         POWER_SUPPLY_PROP_VOLTAGE_MIN,
6259         POWER_SUPPLY_PROP_VOLTAGE_MAX,
6260         POWER_SUPPLY_PROP_VOLTAGE_NOW,
6261         POWER_SUPPLY_PROP_CURRENT_MAX,
6262         POWER_SUPPLY_PROP_CURRENT_NOW,
6263 };
6264
6265 static int tcpm_psy_get_online(struct tcpm_port *port,
6266                                union power_supply_propval *val)
6267 {
6268         if (port->vbus_charge) {
6269                 if (port->pps_data.active)
6270                         val->intval = TCPM_PSY_PROG_ONLINE;
6271                 else
6272                         val->intval = TCPM_PSY_FIXED_ONLINE;
6273         } else {
6274                 val->intval = TCPM_PSY_OFFLINE;
6275         }
6276
6277         return 0;
6278 }
6279
6280 static int tcpm_psy_get_voltage_min(struct tcpm_port *port,
6281                                     union power_supply_propval *val)
6282 {
6283         if (port->pps_data.active)
6284                 val->intval = port->pps_data.min_volt * 1000;
6285         else
6286                 val->intval = port->supply_voltage * 1000;
6287
6288         return 0;
6289 }
6290
6291 static int tcpm_psy_get_voltage_max(struct tcpm_port *port,
6292                                     union power_supply_propval *val)
6293 {
6294         if (port->pps_data.active)
6295                 val->intval = port->pps_data.max_volt * 1000;
6296         else
6297                 val->intval = port->supply_voltage * 1000;
6298
6299         return 0;
6300 }
6301
6302 static int tcpm_psy_get_voltage_now(struct tcpm_port *port,
6303                                     union power_supply_propval *val)
6304 {
6305         val->intval = port->supply_voltage * 1000;
6306
6307         return 0;
6308 }
6309
6310 static int tcpm_psy_get_current_max(struct tcpm_port *port,
6311                                     union power_supply_propval *val)
6312 {
6313         if (port->pps_data.active)
6314                 val->intval = port->pps_data.max_curr * 1000;
6315         else
6316                 val->intval = port->current_limit * 1000;
6317
6318         return 0;
6319 }
6320
6321 static int tcpm_psy_get_current_now(struct tcpm_port *port,
6322                                     union power_supply_propval *val)
6323 {
6324         val->intval = port->current_limit * 1000;
6325
6326         return 0;
6327 }
6328
6329 static int tcpm_psy_get_input_power_limit(struct tcpm_port *port,
6330                                           union power_supply_propval *val)
6331 {
6332         unsigned int src_mv, src_ma, max_src_uw = 0;
6333         unsigned int i, tmp;
6334
6335         for (i = 0; i < port->nr_source_caps; i++) {
6336                 u32 pdo = port->source_caps[i];
6337
6338                 if (pdo_type(pdo) == PDO_TYPE_FIXED) {
6339                         src_mv = pdo_fixed_voltage(pdo);
6340                         src_ma = pdo_max_current(pdo);
6341                         tmp = src_mv * src_ma;
6342                         max_src_uw = tmp > max_src_uw ? tmp : max_src_uw;
6343                 }
6344         }
6345
6346         val->intval = max_src_uw;
6347         return 0;
6348 }
6349
6350 static int tcpm_psy_get_prop(struct power_supply *psy,
6351                              enum power_supply_property psp,
6352                              union power_supply_propval *val)
6353 {
6354         struct tcpm_port *port = power_supply_get_drvdata(psy);
6355         int ret = 0;
6356
6357         switch (psp) {
6358         case POWER_SUPPLY_PROP_USB_TYPE:
6359                 val->intval = port->usb_type;
6360                 break;
6361         case POWER_SUPPLY_PROP_ONLINE:
6362                 ret = tcpm_psy_get_online(port, val);
6363                 break;
6364         case POWER_SUPPLY_PROP_VOLTAGE_MIN:
6365                 ret = tcpm_psy_get_voltage_min(port, val);
6366                 break;
6367         case POWER_SUPPLY_PROP_VOLTAGE_MAX:
6368                 ret = tcpm_psy_get_voltage_max(port, val);
6369                 break;
6370         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
6371                 ret = tcpm_psy_get_voltage_now(port, val);
6372                 break;
6373         case POWER_SUPPLY_PROP_CURRENT_MAX:
6374                 ret = tcpm_psy_get_current_max(port, val);
6375                 break;
6376         case POWER_SUPPLY_PROP_CURRENT_NOW:
6377                 ret = tcpm_psy_get_current_now(port, val);
6378                 break;
6379         case POWER_SUPPLY_PROP_INPUT_POWER_LIMIT:
6380                 tcpm_psy_get_input_power_limit(port, val);
6381                 break;
6382         default:
6383                 ret = -EINVAL;
6384                 break;
6385         }
6386
6387         return ret;
6388 }
6389
6390 static int tcpm_psy_set_online(struct tcpm_port *port,
6391                                const union power_supply_propval *val)
6392 {
6393         int ret;
6394
6395         switch (val->intval) {
6396         case TCPM_PSY_FIXED_ONLINE:
6397                 ret = tcpm_pps_activate(port, false);
6398                 break;
6399         case TCPM_PSY_PROG_ONLINE:
6400                 ret = tcpm_pps_activate(port, true);
6401                 break;
6402         default:
6403                 ret = -EINVAL;
6404                 break;
6405         }
6406
6407         return ret;
6408 }
6409
6410 static int tcpm_psy_set_prop(struct power_supply *psy,
6411                              enum power_supply_property psp,
6412                              const union power_supply_propval *val)
6413 {
6414         struct tcpm_port *port = power_supply_get_drvdata(psy);
6415         int ret;
6416
6417         /*
6418          * All the properties below are related to USB PD. The check needs to be
6419          * property specific when a non-pd related property is added.
6420          */
6421         if (!port->pd_supported)
6422                 return -EOPNOTSUPP;
6423
6424         switch (psp) {
6425         case POWER_SUPPLY_PROP_ONLINE:
6426                 ret = tcpm_psy_set_online(port, val);
6427                 break;
6428         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
6429                 ret = tcpm_pps_set_out_volt(port, val->intval / 1000);
6430                 break;
6431         case POWER_SUPPLY_PROP_CURRENT_NOW:
6432                 if (val->intval > port->pps_data.max_curr * 1000)
6433                         ret = -EINVAL;
6434                 else
6435                         ret = tcpm_pps_set_op_curr(port, val->intval / 1000);
6436                 break;
6437         default:
6438                 ret = -EINVAL;
6439                 break;
6440         }
6441         power_supply_changed(port->psy);
6442         return ret;
6443 }
6444
6445 static int tcpm_psy_prop_writeable(struct power_supply *psy,
6446                                    enum power_supply_property psp)
6447 {
6448         switch (psp) {
6449         case POWER_SUPPLY_PROP_ONLINE:
6450         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
6451         case POWER_SUPPLY_PROP_CURRENT_NOW:
6452                 return 1;
6453         default:
6454                 return 0;
6455         }
6456 }
6457
6458 static enum power_supply_usb_type tcpm_psy_usb_types[] = {
6459         POWER_SUPPLY_USB_TYPE_C,
6460         POWER_SUPPLY_USB_TYPE_PD,
6461         POWER_SUPPLY_USB_TYPE_PD_PPS,
6462 };
6463
6464 static const char *tcpm_psy_name_prefix = "tcpm-source-psy-";
6465
6466 static int devm_tcpm_psy_register(struct tcpm_port *port)
6467 {
6468         struct power_supply_config psy_cfg = {};
6469         const char *port_dev_name = dev_name(port->dev);
6470         size_t psy_name_len = strlen(tcpm_psy_name_prefix) +
6471                                      strlen(port_dev_name) + 1;
6472         char *psy_name;
6473
6474         psy_cfg.drv_data = port;
6475         psy_cfg.fwnode = dev_fwnode(port->dev);
6476         psy_name = devm_kzalloc(port->dev, psy_name_len, GFP_KERNEL);
6477         if (!psy_name)
6478                 return -ENOMEM;
6479
6480         snprintf(psy_name, psy_name_len, "%s%s", tcpm_psy_name_prefix,
6481                  port_dev_name);
6482         port->psy_desc.name = psy_name;
6483         port->psy_desc.type = POWER_SUPPLY_TYPE_USB;
6484         port->psy_desc.usb_types = tcpm_psy_usb_types;
6485         port->psy_desc.num_usb_types = ARRAY_SIZE(tcpm_psy_usb_types);
6486         port->psy_desc.properties = tcpm_psy_props;
6487         port->psy_desc.num_properties = ARRAY_SIZE(tcpm_psy_props);
6488         port->psy_desc.get_property = tcpm_psy_get_prop;
6489         port->psy_desc.set_property = tcpm_psy_set_prop;
6490         port->psy_desc.property_is_writeable = tcpm_psy_prop_writeable;
6491
6492         port->usb_type = POWER_SUPPLY_USB_TYPE_C;
6493
6494         port->psy = devm_power_supply_register(port->dev, &port->psy_desc,
6495                                                &psy_cfg);
6496
6497         return PTR_ERR_OR_ZERO(port->psy);
6498 }
6499
6500 static enum hrtimer_restart state_machine_timer_handler(struct hrtimer *timer)
6501 {
6502         struct tcpm_port *port = container_of(timer, struct tcpm_port, state_machine_timer);
6503
6504         if (port->registered)
6505                 kthread_queue_work(port->wq, &port->state_machine);
6506         return HRTIMER_NORESTART;
6507 }
6508
6509 static enum hrtimer_restart vdm_state_machine_timer_handler(struct hrtimer *timer)
6510 {
6511         struct tcpm_port *port = container_of(timer, struct tcpm_port, vdm_state_machine_timer);
6512
6513         if (port->registered)
6514                 kthread_queue_work(port->wq, &port->vdm_state_machine);
6515         return HRTIMER_NORESTART;
6516 }
6517
6518 static enum hrtimer_restart enable_frs_timer_handler(struct hrtimer *timer)
6519 {
6520         struct tcpm_port *port = container_of(timer, struct tcpm_port, enable_frs_timer);
6521
6522         if (port->registered)
6523                 kthread_queue_work(port->wq, &port->enable_frs);
6524         return HRTIMER_NORESTART;
6525 }
6526
6527 static enum hrtimer_restart send_discover_timer_handler(struct hrtimer *timer)
6528 {
6529         struct tcpm_port *port = container_of(timer, struct tcpm_port, send_discover_timer);
6530
6531         if (port->registered)
6532                 kthread_queue_work(port->wq, &port->send_discover_work);
6533         return HRTIMER_NORESTART;
6534 }
6535
6536 struct tcpm_port *tcpm_register_port(struct device *dev, struct tcpc_dev *tcpc)
6537 {
6538         struct tcpm_port *port;
6539         int err;
6540
6541         if (!dev || !tcpc ||
6542             !tcpc->get_vbus || !tcpc->set_cc || !tcpc->get_cc ||
6543             !tcpc->set_polarity || !tcpc->set_vconn || !tcpc->set_vbus ||
6544             !tcpc->set_pd_rx || !tcpc->set_roles || !tcpc->pd_transmit)
6545                 return ERR_PTR(-EINVAL);
6546
6547         port = devm_kzalloc(dev, sizeof(*port), GFP_KERNEL);
6548         if (!port)
6549                 return ERR_PTR(-ENOMEM);
6550
6551         port->dev = dev;
6552         port->tcpc = tcpc;
6553
6554         mutex_init(&port->lock);
6555         mutex_init(&port->swap_lock);
6556
6557         port->wq = kthread_create_worker(0, dev_name(dev));
6558         if (IS_ERR(port->wq))
6559                 return ERR_CAST(port->wq);
6560         sched_set_fifo(port->wq->task);
6561
6562         kthread_init_work(&port->state_machine, tcpm_state_machine_work);
6563         kthread_init_work(&port->vdm_state_machine, vdm_state_machine_work);
6564         kthread_init_work(&port->event_work, tcpm_pd_event_handler);
6565         kthread_init_work(&port->enable_frs, tcpm_enable_frs_work);
6566         kthread_init_work(&port->send_discover_work, tcpm_send_discover_work);
6567         hrtimer_init(&port->state_machine_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
6568         port->state_machine_timer.function = state_machine_timer_handler;
6569         hrtimer_init(&port->vdm_state_machine_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
6570         port->vdm_state_machine_timer.function = vdm_state_machine_timer_handler;
6571         hrtimer_init(&port->enable_frs_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
6572         port->enable_frs_timer.function = enable_frs_timer_handler;
6573         hrtimer_init(&port->send_discover_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
6574         port->send_discover_timer.function = send_discover_timer_handler;
6575
6576         spin_lock_init(&port->pd_event_lock);
6577
6578         init_completion(&port->tx_complete);
6579         init_completion(&port->swap_complete);
6580         init_completion(&port->pps_complete);
6581         tcpm_debugfs_init(port);
6582
6583         err = tcpm_fw_get_caps(port, tcpc->fwnode);
6584         if (err < 0)
6585                 goto out_destroy_wq;
6586
6587         port->try_role = port->typec_caps.prefer_role;
6588
6589         port->typec_caps.fwnode = tcpc->fwnode;
6590         port->typec_caps.revision = 0x0120;     /* Type-C spec release 1.2 */
6591         port->typec_caps.pd_revision = 0x0300;  /* USB-PD spec release 3.0 */
6592         port->typec_caps.svdm_version = SVDM_VER_2_0;
6593         port->typec_caps.driver_data = port;
6594         port->typec_caps.ops = &tcpm_ops;
6595         port->typec_caps.orientation_aware = 1;
6596
6597         port->partner_desc.identity = &port->partner_ident;
6598         port->port_type = port->typec_caps.type;
6599
6600         port->role_sw = usb_role_switch_get(port->dev);
6601         if (!port->role_sw)
6602                 port->role_sw = fwnode_usb_role_switch_get(tcpc->fwnode);
6603         if (IS_ERR(port->role_sw)) {
6604                 err = PTR_ERR(port->role_sw);
6605                 goto out_destroy_wq;
6606         }
6607
6608         err = devm_tcpm_psy_register(port);
6609         if (err)
6610                 goto out_role_sw_put;
6611         power_supply_changed(port->psy);
6612
6613         err = tcpm_port_register_pd(port);
6614         if (err)
6615                 goto out_role_sw_put;
6616
6617         port->typec_caps.pd = port->pd;
6618
6619         port->typec_port = typec_register_port(port->dev, &port->typec_caps);
6620         if (IS_ERR(port->typec_port)) {
6621                 err = PTR_ERR(port->typec_port);
6622                 goto out_unregister_pd;
6623         }
6624
6625         typec_port_register_altmodes(port->typec_port,
6626                                      &tcpm_altmode_ops, port,
6627                                      port->port_altmode, ALTMODE_DISCOVERY_MAX);
6628         port->registered = true;
6629
6630         mutex_lock(&port->lock);
6631         tcpm_init(port);
6632         mutex_unlock(&port->lock);
6633
6634         tcpm_log(port, "%s: registered", dev_name(dev));
6635         return port;
6636
6637 out_unregister_pd:
6638         tcpm_port_unregister_pd(port);
6639 out_role_sw_put:
6640         usb_role_switch_put(port->role_sw);
6641 out_destroy_wq:
6642         tcpm_debugfs_exit(port);
6643         kthread_destroy_worker(port->wq);
6644         return ERR_PTR(err);
6645 }
6646 EXPORT_SYMBOL_GPL(tcpm_register_port);
6647
6648 void tcpm_unregister_port(struct tcpm_port *port)
6649 {
6650         int i;
6651
6652         port->registered = false;
6653         kthread_destroy_worker(port->wq);
6654
6655         hrtimer_cancel(&port->send_discover_timer);
6656         hrtimer_cancel(&port->enable_frs_timer);
6657         hrtimer_cancel(&port->vdm_state_machine_timer);
6658         hrtimer_cancel(&port->state_machine_timer);
6659
6660         tcpm_reset_port(port);
6661
6662         tcpm_port_unregister_pd(port);
6663
6664         for (i = 0; i < ARRAY_SIZE(port->port_altmode); i++)
6665                 typec_unregister_altmode(port->port_altmode[i]);
6666         typec_unregister_port(port->typec_port);
6667         usb_role_switch_put(port->role_sw);
6668         tcpm_debugfs_exit(port);
6669 }
6670 EXPORT_SYMBOL_GPL(tcpm_unregister_port);
6671
6672 MODULE_AUTHOR("Guenter Roeck <groeck@chromium.org>");
6673 MODULE_DESCRIPTION("USB Type-C Port Manager");
6674 MODULE_LICENSE("GPL");