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 (PD_VDO_SVDM_VER(p[0]) < svdm_version) {
1629                                 typec_partner_set_svdm_version(port->partner,
1630                                                                PD_VDO_SVDM_VER(p[0]));
1631                                 svdm_version = PD_VDO_SVDM_VER(p[0]);
1632                         }
1633
1634                         port->ams = DISCOVER_IDENTITY;
1635                         /*
1636                          * PD2.0 Spec 6.10.3: respond with NAK as DFP (data host)
1637                          * PD3.1 Spec 6.4.4.2.5.1: respond with NAK if "invalid field" or
1638                          * "wrong configuation" or "Unrecognized"
1639                          */
1640                         if ((port->data_role == TYPEC_DEVICE || svdm_version >= SVDM_VER_2_0) &&
1641                             port->nr_snk_vdo) {
1642                                 if (svdm_version < SVDM_VER_2_0) {
1643                                         for (i = 0; i < port->nr_snk_vdo_v1; i++)
1644                                                 response[i + 1] = port->snk_vdo_v1[i];
1645                                         rlen = port->nr_snk_vdo_v1 + 1;
1646
1647                                 } else {
1648                                         for (i = 0; i < port->nr_snk_vdo; i++)
1649                                                 response[i + 1] = port->snk_vdo[i];
1650                                         rlen = port->nr_snk_vdo + 1;
1651                                 }
1652                         }
1653                         break;
1654                 case CMD_DISCOVER_SVID:
1655                         port->ams = DISCOVER_SVIDS;
1656                         break;
1657                 case CMD_DISCOVER_MODES:
1658                         port->ams = DISCOVER_MODES;
1659                         break;
1660                 case CMD_ENTER_MODE:
1661                         port->ams = DFP_TO_UFP_ENTER_MODE;
1662                         break;
1663                 case CMD_EXIT_MODE:
1664                         port->ams = DFP_TO_UFP_EXIT_MODE;
1665                         break;
1666                 case CMD_ATTENTION:
1667                         /* Attention command does not have response */
1668                         *adev_action = ADEV_ATTENTION;
1669                         return 0;
1670                 default:
1671                         break;
1672                 }
1673                 if (rlen >= 1) {
1674                         response[0] = p[0] | VDO_CMDT(CMDT_RSP_ACK);
1675                 } else if (rlen == 0) {
1676                         response[0] = p[0] | VDO_CMDT(CMDT_RSP_NAK);
1677                         rlen = 1;
1678                 } else {
1679                         response[0] = p[0] | VDO_CMDT(CMDT_RSP_BUSY);
1680                         rlen = 1;
1681                 }
1682                 response[0] = (response[0] & ~VDO_SVDM_VERS_MASK) |
1683                               (VDO_SVDM_VERS(typec_get_negotiated_svdm_version(typec)));
1684                 break;
1685         case CMDT_RSP_ACK:
1686                 /* silently drop message if we are not connected */
1687                 if (IS_ERR_OR_NULL(port->partner))
1688                         break;
1689
1690                 tcpm_ams_finish(port);
1691
1692                 switch (cmd) {
1693                 case CMD_DISCOVER_IDENT:
1694                         if (PD_VDO_SVDM_VER(p[0]) < svdm_version)
1695                                 typec_partner_set_svdm_version(port->partner,
1696                                                                PD_VDO_SVDM_VER(p[0]));
1697                         /* 6.4.4.3.1 */
1698                         svdm_consume_identity(port, p, cnt);
1699                         response[0] = VDO(USB_SID_PD, 1, typec_get_negotiated_svdm_version(typec),
1700                                           CMD_DISCOVER_SVID);
1701                         rlen = 1;
1702                         break;
1703                 case CMD_DISCOVER_SVID:
1704                         /* 6.4.4.3.2 */
1705                         if (svdm_consume_svids(port, p, cnt)) {
1706                                 response[0] = VDO(USB_SID_PD, 1, svdm_version, CMD_DISCOVER_SVID);
1707                                 rlen = 1;
1708                         } else if (modep->nsvids && supports_modal(port)) {
1709                                 response[0] = VDO(modep->svids[0], 1, svdm_version,
1710                                                   CMD_DISCOVER_MODES);
1711                                 rlen = 1;
1712                         }
1713                         break;
1714                 case CMD_DISCOVER_MODES:
1715                         /* 6.4.4.3.3 */
1716                         svdm_consume_modes(port, p, cnt);
1717                         modep->svid_index++;
1718                         if (modep->svid_index < modep->nsvids) {
1719                                 u16 svid = modep->svids[modep->svid_index];
1720                                 response[0] = VDO(svid, 1, svdm_version, CMD_DISCOVER_MODES);
1721                                 rlen = 1;
1722                         } else {
1723                                 tcpm_register_partner_altmodes(port);
1724                         }
1725                         break;
1726                 case CMD_ENTER_MODE:
1727                         if (adev && pdev)
1728                                 *adev_action = ADEV_QUEUE_VDM_SEND_EXIT_MODE_ON_FAIL;
1729                         return 0;
1730                 case CMD_EXIT_MODE:
1731                         if (adev && pdev) {
1732                                 /* Back to USB Operation */
1733                                 *adev_action = ADEV_NOTIFY_USB_AND_QUEUE_VDM;
1734                                 return 0;
1735                         }
1736                         break;
1737                 case VDO_CMD_VENDOR(0) ... VDO_CMD_VENDOR(15):
1738                         break;
1739                 default:
1740                         /* Unrecognized SVDM */
1741                         response[0] = p[0] | VDO_CMDT(CMDT_RSP_NAK);
1742                         rlen = 1;
1743                         response[0] = (response[0] & ~VDO_SVDM_VERS_MASK) |
1744                                       (VDO_SVDM_VERS(svdm_version));
1745                         break;
1746                 }
1747                 break;
1748         case CMDT_RSP_NAK:
1749                 tcpm_ams_finish(port);
1750                 switch (cmd) {
1751                 case CMD_DISCOVER_IDENT:
1752                 case CMD_DISCOVER_SVID:
1753                 case CMD_DISCOVER_MODES:
1754                 case VDO_CMD_VENDOR(0) ... VDO_CMD_VENDOR(15):
1755                         break;
1756                 case CMD_ENTER_MODE:
1757                         /* Back to USB Operation */
1758                         *adev_action = ADEV_NOTIFY_USB_AND_QUEUE_VDM;
1759                         return 0;
1760                 default:
1761                         /* Unrecognized SVDM */
1762                         response[0] = p[0] | VDO_CMDT(CMDT_RSP_NAK);
1763                         rlen = 1;
1764                         response[0] = (response[0] & ~VDO_SVDM_VERS_MASK) |
1765                                       (VDO_SVDM_VERS(svdm_version));
1766                         break;
1767                 }
1768                 break;
1769         default:
1770                 response[0] = p[0] | VDO_CMDT(CMDT_RSP_NAK);
1771                 rlen = 1;
1772                 response[0] = (response[0] & ~VDO_SVDM_VERS_MASK) |
1773                               (VDO_SVDM_VERS(svdm_version));
1774                 break;
1775         }
1776
1777         /* Informing the alternate mode drivers about everything */
1778         *adev_action = ADEV_QUEUE_VDM;
1779         return rlen;
1780 }
1781
1782 static void tcpm_pd_handle_msg(struct tcpm_port *port,
1783                                enum pd_msg_request message,
1784                                enum tcpm_ams ams);
1785
1786 static void tcpm_handle_vdm_request(struct tcpm_port *port,
1787                                     const __le32 *payload, int cnt)
1788 {
1789         enum adev_actions adev_action = ADEV_NONE;
1790         struct typec_altmode *adev;
1791         u32 p[PD_MAX_PAYLOAD];
1792         u32 response[8] = { };
1793         int i, rlen = 0;
1794
1795         for (i = 0; i < cnt; i++)
1796                 p[i] = le32_to_cpu(payload[i]);
1797
1798         adev = typec_match_altmode(port->port_altmode, ALTMODE_DISCOVERY_MAX,
1799                                    PD_VDO_VID(p[0]), PD_VDO_OPOS(p[0]));
1800
1801         if (port->vdm_state == VDM_STATE_BUSY) {
1802                 /* If UFP responded busy retry after timeout */
1803                 if (PD_VDO_CMDT(p[0]) == CMDT_RSP_BUSY) {
1804                         port->vdm_state = VDM_STATE_WAIT_RSP_BUSY;
1805                         port->vdo_retry = (p[0] & ~VDO_CMDT_MASK) |
1806                                 CMDT_INIT;
1807                         mod_vdm_delayed_work(port, PD_T_VDM_BUSY);
1808                         return;
1809                 }
1810                 port->vdm_state = VDM_STATE_DONE;
1811         }
1812
1813         if (PD_VDO_SVDM(p[0]) && (adev || tcpm_vdm_ams(port) || port->nr_snk_vdo)) {
1814                 /*
1815                  * Here a SVDM is received (INIT or RSP or unknown). Set the vdm_sm_running in
1816                  * advance because we are dropping the lock but may send VDMs soon.
1817                  * For the cases of INIT received:
1818                  *  - If no response to send, it will be cleared later in this function.
1819                  *  - If there are responses to send, it will be cleared in the state machine.
1820                  * For the cases of RSP received:
1821                  *  - If no further INIT to send, it will be cleared later in this function.
1822                  *  - Otherwise, it will be cleared in the state machine if timeout or it will go
1823                  *    back here until no further INIT to send.
1824                  * For the cases of unknown type received:
1825                  *  - We will send NAK and the flag will be cleared in the state machine.
1826                  */
1827                 port->vdm_sm_running = true;
1828                 rlen = tcpm_pd_svdm(port, adev, p, cnt, response, &adev_action);
1829         } else {
1830                 if (port->negotiated_rev >= PD_REV30)
1831                         tcpm_pd_handle_msg(port, PD_MSG_CTRL_NOT_SUPP, NONE_AMS);
1832         }
1833
1834         /*
1835          * We are done with any state stored in the port struct now, except
1836          * for any port struct changes done by the tcpm_queue_vdm() call
1837          * below, which is a separate operation.
1838          *
1839          * So we can safely release the lock here; and we MUST release the
1840          * lock here to avoid an AB BA lock inversion:
1841          *
1842          * If we keep the lock here then the lock ordering in this path is:
1843          * 1. tcpm_pd_rx_handler take the tcpm port lock
1844          * 2. One of the typec_altmode_* calls below takes the alt-mode's lock
1845          *
1846          * And we also have this ordering:
1847          * 1. alt-mode driver takes the alt-mode's lock
1848          * 2. alt-mode driver calls tcpm_altmode_enter which takes the
1849          *    tcpm port lock
1850          *
1851          * Dropping our lock here avoids this.
1852          */
1853         mutex_unlock(&port->lock);
1854
1855         if (adev) {
1856                 switch (adev_action) {
1857                 case ADEV_NONE:
1858                         break;
1859                 case ADEV_NOTIFY_USB_AND_QUEUE_VDM:
1860                         WARN_ON(typec_altmode_notify(adev, TYPEC_STATE_USB, NULL));
1861                         typec_altmode_vdm(adev, p[0], &p[1], cnt);
1862                         break;
1863                 case ADEV_QUEUE_VDM:
1864                         typec_altmode_vdm(adev, p[0], &p[1], cnt);
1865                         break;
1866                 case ADEV_QUEUE_VDM_SEND_EXIT_MODE_ON_FAIL:
1867                         if (typec_altmode_vdm(adev, p[0], &p[1], cnt)) {
1868                                 int svdm_version = typec_get_negotiated_svdm_version(
1869                                                                         port->typec_port);
1870                                 if (svdm_version < 0)
1871                                         break;
1872
1873                                 response[0] = VDO(adev->svid, 1, svdm_version,
1874                                                   CMD_EXIT_MODE);
1875                                 response[0] |= VDO_OPOS(adev->mode);
1876                                 rlen = 1;
1877                         }
1878                         break;
1879                 case ADEV_ATTENTION:
1880                         if (typec_altmode_attention(adev, p[1]))
1881                                 tcpm_log(port, "typec_altmode_attention no port partner altmode");
1882                         break;
1883                 }
1884         }
1885
1886         /*
1887          * We must re-take the lock here to balance the unlock in
1888          * tcpm_pd_rx_handler, note that no changes, other then the
1889          * tcpm_queue_vdm call, are made while the lock is held again.
1890          * All that is done after the call is unwinding the call stack until
1891          * we return to tcpm_pd_rx_handler and do the unlock there.
1892          */
1893         mutex_lock(&port->lock);
1894
1895         if (rlen > 0)
1896                 tcpm_queue_vdm(port, response[0], &response[1], rlen - 1);
1897         else
1898                 port->vdm_sm_running = false;
1899 }
1900
1901 static void tcpm_send_vdm(struct tcpm_port *port, u32 vid, int cmd,
1902                           const u32 *data, int count)
1903 {
1904         int svdm_version = typec_get_negotiated_svdm_version(port->typec_port);
1905         u32 header;
1906
1907         if (svdm_version < 0)
1908                 return;
1909
1910         if (WARN_ON(count > VDO_MAX_SIZE - 1))
1911                 count = VDO_MAX_SIZE - 1;
1912
1913         /* set VDM header with VID & CMD */
1914         header = VDO(vid, ((vid & USB_SID_PD) == USB_SID_PD) ?
1915                         1 : (PD_VDO_CMD(cmd) <= CMD_ATTENTION),
1916                         svdm_version, cmd);
1917         tcpm_queue_vdm(port, header, data, count);
1918 }
1919
1920 static unsigned int vdm_ready_timeout(u32 vdm_hdr)
1921 {
1922         unsigned int timeout;
1923         int cmd = PD_VDO_CMD(vdm_hdr);
1924
1925         /* its not a structured VDM command */
1926         if (!PD_VDO_SVDM(vdm_hdr))
1927                 return PD_T_VDM_UNSTRUCTURED;
1928
1929         switch (PD_VDO_CMDT(vdm_hdr)) {
1930         case CMDT_INIT:
1931                 if (cmd == CMD_ENTER_MODE || cmd == CMD_EXIT_MODE)
1932                         timeout = PD_T_VDM_WAIT_MODE_E;
1933                 else
1934                         timeout = PD_T_VDM_SNDR_RSP;
1935                 break;
1936         default:
1937                 if (cmd == CMD_ENTER_MODE || cmd == CMD_EXIT_MODE)
1938                         timeout = PD_T_VDM_E_MODE;
1939                 else
1940                         timeout = PD_T_VDM_RCVR_RSP;
1941                 break;
1942         }
1943         return timeout;
1944 }
1945
1946 static void vdm_run_state_machine(struct tcpm_port *port)
1947 {
1948         struct pd_message msg;
1949         int i, res = 0;
1950         u32 vdo_hdr = port->vdo_data[0];
1951
1952         switch (port->vdm_state) {
1953         case VDM_STATE_READY:
1954                 /* Only transmit VDM if attached */
1955                 if (!port->attached) {
1956                         port->vdm_state = VDM_STATE_ERR_BUSY;
1957                         break;
1958                 }
1959
1960                 /*
1961                  * if there's traffic or we're not in PDO ready state don't send
1962                  * a VDM.
1963                  */
1964                 if (port->state != SRC_READY && port->state != SNK_READY) {
1965                         port->vdm_sm_running = false;
1966                         break;
1967                 }
1968
1969                 /* TODO: AMS operation for Unstructured VDM */
1970                 if (PD_VDO_SVDM(vdo_hdr) && PD_VDO_CMDT(vdo_hdr) == CMDT_INIT) {
1971                         switch (PD_VDO_CMD(vdo_hdr)) {
1972                         case CMD_DISCOVER_IDENT:
1973                                 res = tcpm_ams_start(port, DISCOVER_IDENTITY);
1974                                 if (res == 0) {
1975                                         port->send_discover = false;
1976                                 } else if (res == -EAGAIN) {
1977                                         port->vdo_data[0] = 0;
1978                                         mod_send_discover_delayed_work(port,
1979                                                                        SEND_DISCOVER_RETRY_MS);
1980                                 }
1981                                 break;
1982                         case CMD_DISCOVER_SVID:
1983                                 res = tcpm_ams_start(port, DISCOVER_SVIDS);
1984                                 break;
1985                         case CMD_DISCOVER_MODES:
1986                                 res = tcpm_ams_start(port, DISCOVER_MODES);
1987                                 break;
1988                         case CMD_ENTER_MODE:
1989                                 res = tcpm_ams_start(port, DFP_TO_UFP_ENTER_MODE);
1990                                 break;
1991                         case CMD_EXIT_MODE:
1992                                 res = tcpm_ams_start(port, DFP_TO_UFP_EXIT_MODE);
1993                                 break;
1994                         case CMD_ATTENTION:
1995                                 res = tcpm_ams_start(port, ATTENTION);
1996                                 break;
1997                         case VDO_CMD_VENDOR(0) ... VDO_CMD_VENDOR(15):
1998                                 res = tcpm_ams_start(port, STRUCTURED_VDMS);
1999                                 break;
2000                         default:
2001                                 res = -EOPNOTSUPP;
2002                                 break;
2003                         }
2004
2005                         if (res < 0) {
2006                                 port->vdm_state = VDM_STATE_ERR_BUSY;
2007                                 return;
2008                         }
2009                 }
2010
2011                 port->vdm_state = VDM_STATE_SEND_MESSAGE;
2012                 mod_vdm_delayed_work(port, (port->negotiated_rev >= PD_REV30 &&
2013                                             port->pwr_role == TYPEC_SOURCE &&
2014                                             PD_VDO_SVDM(vdo_hdr) &&
2015                                             PD_VDO_CMDT(vdo_hdr) == CMDT_INIT) ?
2016                                            PD_T_SINK_TX : 0);
2017                 break;
2018         case VDM_STATE_WAIT_RSP_BUSY:
2019                 port->vdo_data[0] = port->vdo_retry;
2020                 port->vdo_count = 1;
2021                 port->vdm_state = VDM_STATE_READY;
2022                 tcpm_ams_finish(port);
2023                 break;
2024         case VDM_STATE_BUSY:
2025                 port->vdm_state = VDM_STATE_ERR_TMOUT;
2026                 if (port->ams != NONE_AMS)
2027                         tcpm_ams_finish(port);
2028                 break;
2029         case VDM_STATE_ERR_SEND:
2030                 /*
2031                  * A partner which does not support USB PD will not reply,
2032                  * so this is not a fatal error. At the same time, some
2033                  * devices may not return GoodCRC under some circumstances,
2034                  * so we need to retry.
2035                  */
2036                 if (port->vdm_retries < 3) {
2037                         tcpm_log(port, "VDM Tx error, retry");
2038                         port->vdm_retries++;
2039                         port->vdm_state = VDM_STATE_READY;
2040                         if (PD_VDO_SVDM(vdo_hdr) && PD_VDO_CMDT(vdo_hdr) == CMDT_INIT)
2041                                 tcpm_ams_finish(port);
2042                 } else {
2043                         tcpm_ams_finish(port);
2044                 }
2045                 break;
2046         case VDM_STATE_SEND_MESSAGE:
2047                 /* Prepare and send VDM */
2048                 memset(&msg, 0, sizeof(msg));
2049                 msg.header = PD_HEADER_LE(PD_DATA_VENDOR_DEF,
2050                                           port->pwr_role,
2051                                           port->data_role,
2052                                           port->negotiated_rev,
2053                                           port->message_id, port->vdo_count);
2054                 for (i = 0; i < port->vdo_count; i++)
2055                         msg.payload[i] = cpu_to_le32(port->vdo_data[i]);
2056                 res = tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
2057                 if (res < 0) {
2058                         port->vdm_state = VDM_STATE_ERR_SEND;
2059                 } else {
2060                         unsigned long timeout;
2061
2062                         port->vdm_retries = 0;
2063                         port->vdo_data[0] = 0;
2064                         port->vdm_state = VDM_STATE_BUSY;
2065                         timeout = vdm_ready_timeout(vdo_hdr);
2066                         mod_vdm_delayed_work(port, timeout);
2067                 }
2068                 break;
2069         default:
2070                 break;
2071         }
2072 }
2073
2074 static void vdm_state_machine_work(struct kthread_work *work)
2075 {
2076         struct tcpm_port *port = container_of(work, struct tcpm_port, vdm_state_machine);
2077         enum vdm_states prev_state;
2078
2079         mutex_lock(&port->lock);
2080
2081         /*
2082          * Continue running as long as the port is not busy and there was
2083          * a state change.
2084          */
2085         do {
2086                 prev_state = port->vdm_state;
2087                 vdm_run_state_machine(port);
2088         } while (port->vdm_state != prev_state &&
2089                  port->vdm_state != VDM_STATE_BUSY &&
2090                  port->vdm_state != VDM_STATE_SEND_MESSAGE);
2091
2092         if (port->vdm_state < VDM_STATE_READY)
2093                 port->vdm_sm_running = false;
2094
2095         mutex_unlock(&port->lock);
2096 }
2097
2098 enum pdo_err {
2099         PDO_NO_ERR,
2100         PDO_ERR_NO_VSAFE5V,
2101         PDO_ERR_VSAFE5V_NOT_FIRST,
2102         PDO_ERR_PDO_TYPE_NOT_IN_ORDER,
2103         PDO_ERR_FIXED_NOT_SORTED,
2104         PDO_ERR_VARIABLE_BATT_NOT_SORTED,
2105         PDO_ERR_DUPE_PDO,
2106         PDO_ERR_PPS_APDO_NOT_SORTED,
2107         PDO_ERR_DUPE_PPS_APDO,
2108 };
2109
2110 static const char * const pdo_err_msg[] = {
2111         [PDO_ERR_NO_VSAFE5V] =
2112         " err: source/sink caps should at least have vSafe5V",
2113         [PDO_ERR_VSAFE5V_NOT_FIRST] =
2114         " err: vSafe5V Fixed Supply Object Shall always be the first object",
2115         [PDO_ERR_PDO_TYPE_NOT_IN_ORDER] =
2116         " err: PDOs should be in the following order: Fixed; Battery; Variable",
2117         [PDO_ERR_FIXED_NOT_SORTED] =
2118         " err: Fixed supply pdos should be in increasing order of their fixed voltage",
2119         [PDO_ERR_VARIABLE_BATT_NOT_SORTED] =
2120         " err: Variable/Battery supply pdos should be in increasing order of their minimum voltage",
2121         [PDO_ERR_DUPE_PDO] =
2122         " err: Variable/Batt supply pdos cannot have same min/max voltage",
2123         [PDO_ERR_PPS_APDO_NOT_SORTED] =
2124         " err: Programmable power supply apdos should be in increasing order of their maximum voltage",
2125         [PDO_ERR_DUPE_PPS_APDO] =
2126         " err: Programmable power supply apdos cannot have same min/max voltage and max current",
2127 };
2128
2129 static enum pdo_err tcpm_caps_err(struct tcpm_port *port, const u32 *pdo,
2130                                   unsigned int nr_pdo)
2131 {
2132         unsigned int i;
2133
2134         /* Should at least contain vSafe5v */
2135         if (nr_pdo < 1)
2136                 return PDO_ERR_NO_VSAFE5V;
2137
2138         /* The vSafe5V Fixed Supply Object Shall always be the first object */
2139         if (pdo_type(pdo[0]) != PDO_TYPE_FIXED ||
2140             pdo_fixed_voltage(pdo[0]) != VSAFE5V)
2141                 return PDO_ERR_VSAFE5V_NOT_FIRST;
2142
2143         for (i = 1; i < nr_pdo; i++) {
2144                 if (pdo_type(pdo[i]) < pdo_type(pdo[i - 1])) {
2145                         return PDO_ERR_PDO_TYPE_NOT_IN_ORDER;
2146                 } else if (pdo_type(pdo[i]) == pdo_type(pdo[i - 1])) {
2147                         enum pd_pdo_type type = pdo_type(pdo[i]);
2148
2149                         switch (type) {
2150                         /*
2151                          * The remaining Fixed Supply Objects, if
2152                          * present, shall be sent in voltage order;
2153                          * lowest to highest.
2154                          */
2155                         case PDO_TYPE_FIXED:
2156                                 if (pdo_fixed_voltage(pdo[i]) <=
2157                                     pdo_fixed_voltage(pdo[i - 1]))
2158                                         return PDO_ERR_FIXED_NOT_SORTED;
2159                                 break;
2160                         /*
2161                          * The Battery Supply Objects and Variable
2162                          * supply, if present shall be sent in Minimum
2163                          * Voltage order; lowest to highest.
2164                          */
2165                         case PDO_TYPE_VAR:
2166                         case PDO_TYPE_BATT:
2167                                 if (pdo_min_voltage(pdo[i]) <
2168                                     pdo_min_voltage(pdo[i - 1]))
2169                                         return PDO_ERR_VARIABLE_BATT_NOT_SORTED;
2170                                 else if ((pdo_min_voltage(pdo[i]) ==
2171                                           pdo_min_voltage(pdo[i - 1])) &&
2172                                          (pdo_max_voltage(pdo[i]) ==
2173                                           pdo_max_voltage(pdo[i - 1])))
2174                                         return PDO_ERR_DUPE_PDO;
2175                                 break;
2176                         /*
2177                          * The Programmable Power Supply APDOs, if present,
2178                          * shall be sent in Maximum Voltage order;
2179                          * lowest to highest.
2180                          */
2181                         case PDO_TYPE_APDO:
2182                                 if (pdo_apdo_type(pdo[i]) != APDO_TYPE_PPS)
2183                                         break;
2184
2185                                 if (pdo_pps_apdo_max_voltage(pdo[i]) <
2186                                     pdo_pps_apdo_max_voltage(pdo[i - 1]))
2187                                         return PDO_ERR_PPS_APDO_NOT_SORTED;
2188                                 else if (pdo_pps_apdo_min_voltage(pdo[i]) ==
2189                                           pdo_pps_apdo_min_voltage(pdo[i - 1]) &&
2190                                          pdo_pps_apdo_max_voltage(pdo[i]) ==
2191                                           pdo_pps_apdo_max_voltage(pdo[i - 1]) &&
2192                                          pdo_pps_apdo_max_current(pdo[i]) ==
2193                                           pdo_pps_apdo_max_current(pdo[i - 1]))
2194                                         return PDO_ERR_DUPE_PPS_APDO;
2195                                 break;
2196                         default:
2197                                 tcpm_log_force(port, " Unknown pdo type");
2198                         }
2199                 }
2200         }
2201
2202         return PDO_NO_ERR;
2203 }
2204
2205 static int tcpm_validate_caps(struct tcpm_port *port, const u32 *pdo,
2206                               unsigned int nr_pdo)
2207 {
2208         enum pdo_err err_index = tcpm_caps_err(port, pdo, nr_pdo);
2209
2210         if (err_index != PDO_NO_ERR) {
2211                 tcpm_log_force(port, " %s", pdo_err_msg[err_index]);
2212                 return -EINVAL;
2213         }
2214
2215         return 0;
2216 }
2217
2218 static int tcpm_altmode_enter(struct typec_altmode *altmode, u32 *vdo)
2219 {
2220         struct tcpm_port *port = typec_altmode_get_drvdata(altmode);
2221         int svdm_version;
2222         u32 header;
2223
2224         svdm_version = typec_get_negotiated_svdm_version(port->typec_port);
2225         if (svdm_version < 0)
2226                 return svdm_version;
2227
2228         header = VDO(altmode->svid, vdo ? 2 : 1, svdm_version, CMD_ENTER_MODE);
2229         header |= VDO_OPOS(altmode->mode);
2230
2231         tcpm_queue_vdm_unlocked(port, header, vdo, vdo ? 1 : 0);
2232         return 0;
2233 }
2234
2235 static int tcpm_altmode_exit(struct typec_altmode *altmode)
2236 {
2237         struct tcpm_port *port = typec_altmode_get_drvdata(altmode);
2238         int svdm_version;
2239         u32 header;
2240
2241         svdm_version = typec_get_negotiated_svdm_version(port->typec_port);
2242         if (svdm_version < 0)
2243                 return svdm_version;
2244
2245         header = VDO(altmode->svid, 1, svdm_version, CMD_EXIT_MODE);
2246         header |= VDO_OPOS(altmode->mode);
2247
2248         tcpm_queue_vdm_unlocked(port, header, NULL, 0);
2249         return 0;
2250 }
2251
2252 static int tcpm_altmode_vdm(struct typec_altmode *altmode,
2253                             u32 header, const u32 *data, int count)
2254 {
2255         struct tcpm_port *port = typec_altmode_get_drvdata(altmode);
2256
2257         tcpm_queue_vdm_unlocked(port, header, data, count - 1);
2258
2259         return 0;
2260 }
2261
2262 static const struct typec_altmode_ops tcpm_altmode_ops = {
2263         .enter = tcpm_altmode_enter,
2264         .exit = tcpm_altmode_exit,
2265         .vdm = tcpm_altmode_vdm,
2266 };
2267
2268 /*
2269  * PD (data, control) command handling functions
2270  */
2271 static inline enum tcpm_state ready_state(struct tcpm_port *port)
2272 {
2273         if (port->pwr_role == TYPEC_SOURCE)
2274                 return SRC_READY;
2275         else
2276                 return SNK_READY;
2277 }
2278
2279 static int tcpm_pd_send_control(struct tcpm_port *port,
2280                                 enum pd_ctrl_msg_type type);
2281
2282 static void tcpm_handle_alert(struct tcpm_port *port, const __le32 *payload,
2283                               int cnt)
2284 {
2285         u32 p0 = le32_to_cpu(payload[0]);
2286         unsigned int type = usb_pd_ado_type(p0);
2287
2288         if (!type) {
2289                 tcpm_log(port, "Alert message received with no type");
2290                 tcpm_queue_message(port, PD_MSG_CTRL_NOT_SUPP);
2291                 return;
2292         }
2293
2294         /* Just handling non-battery alerts for now */
2295         if (!(type & USB_PD_ADO_TYPE_BATT_STATUS_CHANGE)) {
2296                 if (port->pwr_role == TYPEC_SOURCE) {
2297                         port->upcoming_state = GET_STATUS_SEND;
2298                         tcpm_ams_start(port, GETTING_SOURCE_SINK_STATUS);
2299                 } else {
2300                         /*
2301                          * Do not check SinkTxOk here in case the Source doesn't set its Rp to
2302                          * SinkTxOk in time.
2303                          */
2304                         port->ams = GETTING_SOURCE_SINK_STATUS;
2305                         tcpm_set_state(port, GET_STATUS_SEND, 0);
2306                 }
2307         } else {
2308                 tcpm_queue_message(port, PD_MSG_CTRL_NOT_SUPP);
2309         }
2310 }
2311
2312 static int tcpm_set_auto_vbus_discharge_threshold(struct tcpm_port *port,
2313                                                   enum typec_pwr_opmode mode, bool pps_active,
2314                                                   u32 requested_vbus_voltage)
2315 {
2316         int ret;
2317
2318         if (!port->tcpc->set_auto_vbus_discharge_threshold)
2319                 return 0;
2320
2321         ret = port->tcpc->set_auto_vbus_discharge_threshold(port->tcpc, mode, pps_active,
2322                                                             requested_vbus_voltage);
2323         tcpm_log_force(port,
2324                        "set_auto_vbus_discharge_threshold mode:%d pps_active:%c vbus:%u ret:%d",
2325                        mode, pps_active ? 'y' : 'n', requested_vbus_voltage, ret);
2326
2327         return ret;
2328 }
2329
2330 static void tcpm_pd_handle_state(struct tcpm_port *port,
2331                                  enum tcpm_state state,
2332                                  enum tcpm_ams ams,
2333                                  unsigned int delay_ms)
2334 {
2335         switch (port->state) {
2336         case SRC_READY:
2337         case SNK_READY:
2338                 port->ams = ams;
2339                 tcpm_set_state(port, state, delay_ms);
2340                 break;
2341         /* 8.3.3.4.1.1 and 6.8.1 power transitioning */
2342         case SNK_TRANSITION_SINK:
2343         case SNK_TRANSITION_SINK_VBUS:
2344         case SRC_TRANSITION_SUPPLY:
2345                 tcpm_set_state(port, HARD_RESET_SEND, 0);
2346                 break;
2347         default:
2348                 if (!tcpm_ams_interruptible(port)) {
2349                         tcpm_set_state(port, port->pwr_role == TYPEC_SOURCE ?
2350                                        SRC_SOFT_RESET_WAIT_SNK_TX :
2351                                        SNK_SOFT_RESET,
2352                                        0);
2353                 } else {
2354                         /* process the Message 6.8.1 */
2355                         port->upcoming_state = state;
2356                         port->next_ams = ams;
2357                         tcpm_set_state(port, ready_state(port), delay_ms);
2358                 }
2359                 break;
2360         }
2361 }
2362
2363 static void tcpm_pd_handle_msg(struct tcpm_port *port,
2364                                enum pd_msg_request message,
2365                                enum tcpm_ams ams)
2366 {
2367         switch (port->state) {
2368         case SRC_READY:
2369         case SNK_READY:
2370                 port->ams = ams;
2371                 tcpm_queue_message(port, message);
2372                 break;
2373         /* PD 3.0 Spec 8.3.3.4.1.1 and 6.8.1 */
2374         case SNK_TRANSITION_SINK:
2375         case SNK_TRANSITION_SINK_VBUS:
2376         case SRC_TRANSITION_SUPPLY:
2377                 tcpm_set_state(port, HARD_RESET_SEND, 0);
2378                 break;
2379         default:
2380                 if (!tcpm_ams_interruptible(port)) {
2381                         tcpm_set_state(port, port->pwr_role == TYPEC_SOURCE ?
2382                                        SRC_SOFT_RESET_WAIT_SNK_TX :
2383                                        SNK_SOFT_RESET,
2384                                        0);
2385                 } else {
2386                         port->next_ams = ams;
2387                         tcpm_set_state(port, ready_state(port), 0);
2388                         /* 6.8.1 process the Message */
2389                         tcpm_queue_message(port, message);
2390                 }
2391                 break;
2392         }
2393 }
2394
2395 static int tcpm_register_source_caps(struct tcpm_port *port)
2396 {
2397         struct usb_power_delivery_desc desc = { port->negotiated_rev };
2398         struct usb_power_delivery_capabilities_desc caps = { };
2399         struct usb_power_delivery_capabilities *cap;
2400
2401         if (!port->partner_pd)
2402                 port->partner_pd = usb_power_delivery_register(NULL, &desc);
2403         if (IS_ERR(port->partner_pd))
2404                 return PTR_ERR(port->partner_pd);
2405
2406         memcpy(caps.pdo, port->source_caps, sizeof(u32) * port->nr_source_caps);
2407         caps.role = TYPEC_SOURCE;
2408
2409         cap = usb_power_delivery_register_capabilities(port->partner_pd, &caps);
2410         if (IS_ERR(cap))
2411                 return PTR_ERR(cap);
2412
2413         port->partner_source_caps = cap;
2414
2415         return 0;
2416 }
2417
2418 static int tcpm_register_sink_caps(struct tcpm_port *port)
2419 {
2420         struct usb_power_delivery_desc desc = { port->negotiated_rev };
2421         struct usb_power_delivery_capabilities_desc caps = { };
2422         struct usb_power_delivery_capabilities *cap;
2423
2424         if (!port->partner_pd)
2425                 port->partner_pd = usb_power_delivery_register(NULL, &desc);
2426         if (IS_ERR(port->partner_pd))
2427                 return PTR_ERR(port->partner_pd);
2428
2429         memcpy(caps.pdo, port->sink_caps, sizeof(u32) * port->nr_sink_caps);
2430         caps.role = TYPEC_SINK;
2431
2432         cap = usb_power_delivery_register_capabilities(port->partner_pd, &caps);
2433         if (IS_ERR(cap))
2434                 return PTR_ERR(cap);
2435
2436         port->partner_sink_caps = cap;
2437
2438         return 0;
2439 }
2440
2441 static void tcpm_pd_data_request(struct tcpm_port *port,
2442                                  const struct pd_message *msg)
2443 {
2444         enum pd_data_msg_type type = pd_header_type_le(msg->header);
2445         unsigned int cnt = pd_header_cnt_le(msg->header);
2446         unsigned int rev = pd_header_rev_le(msg->header);
2447         unsigned int i;
2448         enum frs_typec_current partner_frs_current;
2449         bool frs_enable;
2450         int ret;
2451
2452         if (tcpm_vdm_ams(port) && type != PD_DATA_VENDOR_DEF) {
2453                 port->vdm_state = VDM_STATE_ERR_BUSY;
2454                 tcpm_ams_finish(port);
2455                 mod_vdm_delayed_work(port, 0);
2456         }
2457
2458         switch (type) {
2459         case PD_DATA_SOURCE_CAP:
2460                 for (i = 0; i < cnt; i++)
2461                         port->source_caps[i] = le32_to_cpu(msg->payload[i]);
2462
2463                 port->nr_source_caps = cnt;
2464
2465                 tcpm_log_source_caps(port);
2466
2467                 tcpm_validate_caps(port, port->source_caps,
2468                                    port->nr_source_caps);
2469
2470                 tcpm_register_source_caps(port);
2471
2472                 /*
2473                  * Adjust revision in subsequent message headers, as required,
2474                  * to comply with 6.2.1.1.5 of the USB PD 3.0 spec. We don't
2475                  * support Rev 1.0 so just do nothing in that scenario.
2476                  */
2477                 if (rev == PD_REV10) {
2478                         if (port->ams == GET_SOURCE_CAPABILITIES)
2479                                 tcpm_ams_finish(port);
2480                         break;
2481                 }
2482
2483                 if (rev < PD_MAX_REV)
2484                         port->negotiated_rev = rev;
2485
2486                 if (port->pwr_role == TYPEC_SOURCE) {
2487                         if (port->ams == GET_SOURCE_CAPABILITIES)
2488                                 tcpm_pd_handle_state(port, SRC_READY, NONE_AMS, 0);
2489                         /* Unexpected Source Capabilities */
2490                         else
2491                                 tcpm_pd_handle_msg(port,
2492                                                    port->negotiated_rev < PD_REV30 ?
2493                                                    PD_MSG_CTRL_REJECT :
2494                                                    PD_MSG_CTRL_NOT_SUPP,
2495                                                    NONE_AMS);
2496                 } else if (port->state == SNK_WAIT_CAPABILITIES) {
2497                 /*
2498                  * This message may be received even if VBUS is not
2499                  * present. This is quite unexpected; see USB PD
2500                  * specification, sections 8.3.3.6.3.1 and 8.3.3.6.3.2.
2501                  * However, at the same time, we must be ready to
2502                  * receive this message and respond to it 15ms after
2503                  * receiving PS_RDY during power swap operations, no matter
2504                  * if VBUS is available or not (USB PD specification,
2505                  * section 6.5.9.2).
2506                  * So we need to accept the message either way,
2507                  * but be prepared to keep waiting for VBUS after it was
2508                  * handled.
2509                  */
2510                         port->ams = POWER_NEGOTIATION;
2511                         port->in_ams = true;
2512                         tcpm_set_state(port, SNK_NEGOTIATE_CAPABILITIES, 0);
2513                 } else {
2514                         if (port->ams == GET_SOURCE_CAPABILITIES)
2515                                 tcpm_ams_finish(port);
2516                         tcpm_pd_handle_state(port, SNK_NEGOTIATE_CAPABILITIES,
2517                                              POWER_NEGOTIATION, 0);
2518                 }
2519                 break;
2520         case PD_DATA_REQUEST:
2521                 /*
2522                  * Adjust revision in subsequent message headers, as required,
2523                  * to comply with 6.2.1.1.5 of the USB PD 3.0 spec. We don't
2524                  * support Rev 1.0 so just reject in that scenario.
2525                  */
2526                 if (rev == PD_REV10) {
2527                         tcpm_pd_handle_msg(port,
2528                                            port->negotiated_rev < PD_REV30 ?
2529                                            PD_MSG_CTRL_REJECT :
2530                                            PD_MSG_CTRL_NOT_SUPP,
2531                                            NONE_AMS);
2532                         break;
2533                 }
2534
2535                 if (rev < PD_MAX_REV)
2536                         port->negotiated_rev = rev;
2537
2538                 if (port->pwr_role != TYPEC_SOURCE || cnt != 1) {
2539                         tcpm_pd_handle_msg(port,
2540                                            port->negotiated_rev < PD_REV30 ?
2541                                            PD_MSG_CTRL_REJECT :
2542                                            PD_MSG_CTRL_NOT_SUPP,
2543                                            NONE_AMS);
2544                         break;
2545                 }
2546
2547                 port->sink_request = le32_to_cpu(msg->payload[0]);
2548
2549                 if (port->vdm_sm_running && port->explicit_contract) {
2550                         tcpm_pd_handle_msg(port, PD_MSG_CTRL_WAIT, port->ams);
2551                         break;
2552                 }
2553
2554                 if (port->state == SRC_SEND_CAPABILITIES)
2555                         tcpm_set_state(port, SRC_NEGOTIATE_CAPABILITIES, 0);
2556                 else
2557                         tcpm_pd_handle_state(port, SRC_NEGOTIATE_CAPABILITIES,
2558                                              POWER_NEGOTIATION, 0);
2559                 break;
2560         case PD_DATA_SINK_CAP:
2561                 /* We don't do anything with this at the moment... */
2562                 for (i = 0; i < cnt; i++)
2563                         port->sink_caps[i] = le32_to_cpu(msg->payload[i]);
2564
2565                 partner_frs_current = (port->sink_caps[0] & PDO_FIXED_FRS_CURR_MASK) >>
2566                         PDO_FIXED_FRS_CURR_SHIFT;
2567                 frs_enable = partner_frs_current && (partner_frs_current <=
2568                                                      port->new_source_frs_current);
2569                 tcpm_log(port,
2570                          "Port partner FRS capable partner_frs_current:%u port_frs_current:%u enable:%c",
2571                          partner_frs_current, port->new_source_frs_current, frs_enable ? 'y' : 'n');
2572                 if (frs_enable) {
2573                         ret  = port->tcpc->enable_frs(port->tcpc, true);
2574                         tcpm_log(port, "Enable FRS %s, ret:%d\n", ret ? "fail" : "success", ret);
2575                 }
2576
2577                 port->nr_sink_caps = cnt;
2578                 port->sink_cap_done = true;
2579                 tcpm_register_sink_caps(port);
2580
2581                 if (port->ams == GET_SINK_CAPABILITIES)
2582                         tcpm_set_state(port, ready_state(port), 0);
2583                 /* Unexpected Sink Capabilities */
2584                 else
2585                         tcpm_pd_handle_msg(port,
2586                                            port->negotiated_rev < PD_REV30 ?
2587                                            PD_MSG_CTRL_REJECT :
2588                                            PD_MSG_CTRL_NOT_SUPP,
2589                                            NONE_AMS);
2590                 break;
2591         case PD_DATA_VENDOR_DEF:
2592                 tcpm_handle_vdm_request(port, msg->payload, cnt);
2593                 break;
2594         case PD_DATA_BIST:
2595                 port->bist_request = le32_to_cpu(msg->payload[0]);
2596                 tcpm_pd_handle_state(port, BIST_RX, BIST, 0);
2597                 break;
2598         case PD_DATA_ALERT:
2599                 if (port->state != SRC_READY && port->state != SNK_READY)
2600                         tcpm_pd_handle_state(port, port->pwr_role == TYPEC_SOURCE ?
2601                                              SRC_SOFT_RESET_WAIT_SNK_TX : SNK_SOFT_RESET,
2602                                              NONE_AMS, 0);
2603                 else
2604                         tcpm_handle_alert(port, msg->payload, cnt);
2605                 break;
2606         case PD_DATA_BATT_STATUS:
2607         case PD_DATA_GET_COUNTRY_INFO:
2608                 /* Currently unsupported */
2609                 tcpm_pd_handle_msg(port, port->negotiated_rev < PD_REV30 ?
2610                                    PD_MSG_CTRL_REJECT :
2611                                    PD_MSG_CTRL_NOT_SUPP,
2612                                    NONE_AMS);
2613                 break;
2614         default:
2615                 tcpm_pd_handle_msg(port, port->negotiated_rev < PD_REV30 ?
2616                                    PD_MSG_CTRL_REJECT :
2617                                    PD_MSG_CTRL_NOT_SUPP,
2618                                    NONE_AMS);
2619                 tcpm_log(port, "Unrecognized data message type %#x", type);
2620                 break;
2621         }
2622 }
2623
2624 static void tcpm_pps_complete(struct tcpm_port *port, int result)
2625 {
2626         if (port->pps_pending) {
2627                 port->pps_status = result;
2628                 port->pps_pending = false;
2629                 complete(&port->pps_complete);
2630         }
2631 }
2632
2633 static void tcpm_pd_ctrl_request(struct tcpm_port *port,
2634                                  const struct pd_message *msg)
2635 {
2636         enum pd_ctrl_msg_type type = pd_header_type_le(msg->header);
2637         enum tcpm_state next_state;
2638
2639         /*
2640          * Stop VDM state machine if interrupted by other Messages while NOT_SUPP is allowed in
2641          * VDM AMS if waiting for VDM responses and will be handled later.
2642          */
2643         if (tcpm_vdm_ams(port) && type != PD_CTRL_NOT_SUPP && type != PD_CTRL_GOOD_CRC) {
2644                 port->vdm_state = VDM_STATE_ERR_BUSY;
2645                 tcpm_ams_finish(port);
2646                 mod_vdm_delayed_work(port, 0);
2647         }
2648
2649         switch (type) {
2650         case PD_CTRL_GOOD_CRC:
2651         case PD_CTRL_PING:
2652                 break;
2653         case PD_CTRL_GET_SOURCE_CAP:
2654                 tcpm_pd_handle_msg(port, PD_MSG_DATA_SOURCE_CAP, GET_SOURCE_CAPABILITIES);
2655                 break;
2656         case PD_CTRL_GET_SINK_CAP:
2657                 tcpm_pd_handle_msg(port, PD_MSG_DATA_SINK_CAP, GET_SINK_CAPABILITIES);
2658                 break;
2659         case PD_CTRL_GOTO_MIN:
2660                 break;
2661         case PD_CTRL_PS_RDY:
2662                 switch (port->state) {
2663                 case SNK_TRANSITION_SINK:
2664                         if (port->vbus_present) {
2665                                 tcpm_set_current_limit(port,
2666                                                        port->req_current_limit,
2667                                                        port->req_supply_voltage);
2668                                 port->explicit_contract = true;
2669                                 tcpm_set_auto_vbus_discharge_threshold(port,
2670                                                                        TYPEC_PWR_MODE_PD,
2671                                                                        port->pps_data.active,
2672                                                                        port->supply_voltage);
2673                                 tcpm_set_state(port, SNK_READY, 0);
2674                         } else {
2675                                 /*
2676                                  * Seen after power swap. Keep waiting for VBUS
2677                                  * in a transitional state.
2678                                  */
2679                                 tcpm_set_state(port,
2680                                                SNK_TRANSITION_SINK_VBUS, 0);
2681                         }
2682                         break;
2683                 case PR_SWAP_SRC_SNK_SOURCE_OFF_CC_DEBOUNCED:
2684                         tcpm_set_state(port, PR_SWAP_SRC_SNK_SINK_ON, 0);
2685                         break;
2686                 case PR_SWAP_SNK_SRC_SINK_OFF:
2687                         tcpm_set_state(port, PR_SWAP_SNK_SRC_SOURCE_ON, 0);
2688                         break;
2689                 case VCONN_SWAP_WAIT_FOR_VCONN:
2690                         tcpm_set_state(port, VCONN_SWAP_TURN_OFF_VCONN, 0);
2691                         break;
2692                 case FR_SWAP_SNK_SRC_TRANSITION_TO_OFF:
2693                         tcpm_set_state(port, FR_SWAP_SNK_SRC_NEW_SINK_READY, 0);
2694                         break;
2695                 default:
2696                         tcpm_pd_handle_state(port,
2697                                              port->pwr_role == TYPEC_SOURCE ?
2698                                              SRC_SOFT_RESET_WAIT_SNK_TX :
2699                                              SNK_SOFT_RESET,
2700                                              NONE_AMS, 0);
2701                         break;
2702                 }
2703                 break;
2704         case PD_CTRL_REJECT:
2705         case PD_CTRL_WAIT:
2706         case PD_CTRL_NOT_SUPP:
2707                 switch (port->state) {
2708                 case SNK_NEGOTIATE_CAPABILITIES:
2709                         /* USB PD specification, Figure 8-43 */
2710                         if (port->explicit_contract)
2711                                 next_state = SNK_READY;
2712                         else
2713                                 next_state = SNK_WAIT_CAPABILITIES;
2714
2715                         /* Threshold was relaxed before sending Request. Restore it back. */
2716                         tcpm_set_auto_vbus_discharge_threshold(port, TYPEC_PWR_MODE_PD,
2717                                                                port->pps_data.active,
2718                                                                port->supply_voltage);
2719                         tcpm_set_state(port, next_state, 0);
2720                         break;
2721                 case SNK_NEGOTIATE_PPS_CAPABILITIES:
2722                         /* Revert data back from any requested PPS updates */
2723                         port->pps_data.req_out_volt = port->supply_voltage;
2724                         port->pps_data.req_op_curr = port->current_limit;
2725                         port->pps_status = (type == PD_CTRL_WAIT ?
2726                                             -EAGAIN : -EOPNOTSUPP);
2727
2728                         /* Threshold was relaxed before sending Request. Restore it back. */
2729                         tcpm_set_auto_vbus_discharge_threshold(port, TYPEC_PWR_MODE_PD,
2730                                                                port->pps_data.active,
2731                                                                port->supply_voltage);
2732
2733                         tcpm_set_state(port, SNK_READY, 0);
2734                         break;
2735                 case DR_SWAP_SEND:
2736                         port->swap_status = (type == PD_CTRL_WAIT ?
2737                                              -EAGAIN : -EOPNOTSUPP);
2738                         tcpm_set_state(port, DR_SWAP_CANCEL, 0);
2739                         break;
2740                 case PR_SWAP_SEND:
2741                         port->swap_status = (type == PD_CTRL_WAIT ?
2742                                              -EAGAIN : -EOPNOTSUPP);
2743                         tcpm_set_state(port, PR_SWAP_CANCEL, 0);
2744                         break;
2745                 case VCONN_SWAP_SEND:
2746                         port->swap_status = (type == PD_CTRL_WAIT ?
2747                                              -EAGAIN : -EOPNOTSUPP);
2748                         tcpm_set_state(port, VCONN_SWAP_CANCEL, 0);
2749                         break;
2750                 case FR_SWAP_SEND:
2751                         tcpm_set_state(port, FR_SWAP_CANCEL, 0);
2752                         break;
2753                 case GET_SINK_CAP:
2754                         port->sink_cap_done = true;
2755                         tcpm_set_state(port, ready_state(port), 0);
2756                         break;
2757                 /*
2758                  * Some port partners do not support GET_STATUS, avoid soft reset the link to
2759                  * prevent redundant power re-negotiation
2760                  */
2761                 case GET_STATUS_SEND:
2762                         tcpm_set_state(port, ready_state(port), 0);
2763                         break;
2764                 case SRC_READY:
2765                 case SNK_READY:
2766                         if (port->vdm_state > VDM_STATE_READY) {
2767                                 port->vdm_state = VDM_STATE_DONE;
2768                                 if (tcpm_vdm_ams(port))
2769                                         tcpm_ams_finish(port);
2770                                 mod_vdm_delayed_work(port, 0);
2771                                 break;
2772                         }
2773                         fallthrough;
2774                 default:
2775                         tcpm_pd_handle_state(port,
2776                                              port->pwr_role == TYPEC_SOURCE ?
2777                                              SRC_SOFT_RESET_WAIT_SNK_TX :
2778                                              SNK_SOFT_RESET,
2779                                              NONE_AMS, 0);
2780                         break;
2781                 }
2782                 break;
2783         case PD_CTRL_ACCEPT:
2784                 switch (port->state) {
2785                 case SNK_NEGOTIATE_CAPABILITIES:
2786                         port->pps_data.active = false;
2787                         tcpm_set_state(port, SNK_TRANSITION_SINK, 0);
2788                         break;
2789                 case SNK_NEGOTIATE_PPS_CAPABILITIES:
2790                         port->pps_data.active = true;
2791                         port->pps_data.min_volt = port->pps_data.req_min_volt;
2792                         port->pps_data.max_volt = port->pps_data.req_max_volt;
2793                         port->pps_data.max_curr = port->pps_data.req_max_curr;
2794                         port->req_supply_voltage = port->pps_data.req_out_volt;
2795                         port->req_current_limit = port->pps_data.req_op_curr;
2796                         power_supply_changed(port->psy);
2797                         tcpm_set_state(port, SNK_TRANSITION_SINK, 0);
2798                         break;
2799                 case SOFT_RESET_SEND:
2800                         if (port->ams == SOFT_RESET_AMS)
2801                                 tcpm_ams_finish(port);
2802                         if (port->pwr_role == TYPEC_SOURCE) {
2803                                 port->upcoming_state = SRC_SEND_CAPABILITIES;
2804                                 tcpm_ams_start(port, POWER_NEGOTIATION);
2805                         } else {
2806                                 tcpm_set_state(port, SNK_WAIT_CAPABILITIES, 0);
2807                         }
2808                         break;
2809                 case DR_SWAP_SEND:
2810                         tcpm_set_state(port, DR_SWAP_CHANGE_DR, 0);
2811                         break;
2812                 case PR_SWAP_SEND:
2813                         tcpm_set_state(port, PR_SWAP_START, 0);
2814                         break;
2815                 case VCONN_SWAP_SEND:
2816                         tcpm_set_state(port, VCONN_SWAP_START, 0);
2817                         break;
2818                 case FR_SWAP_SEND:
2819                         tcpm_set_state(port, FR_SWAP_SNK_SRC_TRANSITION_TO_OFF, 0);
2820                         break;
2821                 default:
2822                         tcpm_pd_handle_state(port,
2823                                              port->pwr_role == TYPEC_SOURCE ?
2824                                              SRC_SOFT_RESET_WAIT_SNK_TX :
2825                                              SNK_SOFT_RESET,
2826                                              NONE_AMS, 0);
2827                         break;
2828                 }
2829                 break;
2830         case PD_CTRL_SOFT_RESET:
2831                 port->ams = SOFT_RESET_AMS;
2832                 tcpm_set_state(port, SOFT_RESET, 0);
2833                 break;
2834         case PD_CTRL_DR_SWAP:
2835                 /*
2836                  * XXX
2837                  * 6.3.9: If an alternate mode is active, a request to swap
2838                  * alternate modes shall trigger a port reset.
2839                  */
2840                 if (port->typec_caps.data != TYPEC_PORT_DRD) {
2841                         tcpm_pd_handle_msg(port,
2842                                            port->negotiated_rev < PD_REV30 ?
2843                                            PD_MSG_CTRL_REJECT :
2844                                            PD_MSG_CTRL_NOT_SUPP,
2845                                            NONE_AMS);
2846                 } else {
2847                         if (port->send_discover) {
2848                                 tcpm_queue_message(port, PD_MSG_CTRL_WAIT);
2849                                 break;
2850                         }
2851
2852                         tcpm_pd_handle_state(port, DR_SWAP_ACCEPT, DATA_ROLE_SWAP, 0);
2853                 }
2854                 break;
2855         case PD_CTRL_PR_SWAP:
2856                 if (port->port_type != TYPEC_PORT_DRP) {
2857                         tcpm_pd_handle_msg(port,
2858                                            port->negotiated_rev < PD_REV30 ?
2859                                            PD_MSG_CTRL_REJECT :
2860                                            PD_MSG_CTRL_NOT_SUPP,
2861                                            NONE_AMS);
2862                 } else {
2863                         if (port->send_discover) {
2864                                 tcpm_queue_message(port, PD_MSG_CTRL_WAIT);
2865                                 break;
2866                         }
2867
2868                         tcpm_pd_handle_state(port, PR_SWAP_ACCEPT, POWER_ROLE_SWAP, 0);
2869                 }
2870                 break;
2871         case PD_CTRL_VCONN_SWAP:
2872                 if (port->send_discover) {
2873                         tcpm_queue_message(port, PD_MSG_CTRL_WAIT);
2874                         break;
2875                 }
2876
2877                 tcpm_pd_handle_state(port, VCONN_SWAP_ACCEPT, VCONN_SWAP, 0);
2878                 break;
2879         case PD_CTRL_GET_SOURCE_CAP_EXT:
2880         case PD_CTRL_GET_STATUS:
2881         case PD_CTRL_FR_SWAP:
2882         case PD_CTRL_GET_PPS_STATUS:
2883         case PD_CTRL_GET_COUNTRY_CODES:
2884                 /* Currently not supported */
2885                 tcpm_pd_handle_msg(port,
2886                                    port->negotiated_rev < PD_REV30 ?
2887                                    PD_MSG_CTRL_REJECT :
2888                                    PD_MSG_CTRL_NOT_SUPP,
2889                                    NONE_AMS);
2890                 break;
2891         default:
2892                 tcpm_pd_handle_msg(port,
2893                                    port->negotiated_rev < PD_REV30 ?
2894                                    PD_MSG_CTRL_REJECT :
2895                                    PD_MSG_CTRL_NOT_SUPP,
2896                                    NONE_AMS);
2897                 tcpm_log(port, "Unrecognized ctrl message type %#x", type);
2898                 break;
2899         }
2900 }
2901
2902 static void tcpm_pd_ext_msg_request(struct tcpm_port *port,
2903                                     const struct pd_message *msg)
2904 {
2905         enum pd_ext_msg_type type = pd_header_type_le(msg->header);
2906         unsigned int data_size = pd_ext_header_data_size_le(msg->ext_msg.header);
2907
2908         /* stopping VDM state machine if interrupted by other Messages */
2909         if (tcpm_vdm_ams(port)) {
2910                 port->vdm_state = VDM_STATE_ERR_BUSY;
2911                 tcpm_ams_finish(port);
2912                 mod_vdm_delayed_work(port, 0);
2913         }
2914
2915         if (!(le16_to_cpu(msg->ext_msg.header) & PD_EXT_HDR_CHUNKED)) {
2916                 tcpm_pd_handle_msg(port, PD_MSG_CTRL_NOT_SUPP, NONE_AMS);
2917                 tcpm_log(port, "Unchunked extended messages unsupported");
2918                 return;
2919         }
2920
2921         if (data_size > PD_EXT_MAX_CHUNK_DATA) {
2922                 tcpm_pd_handle_state(port, CHUNK_NOT_SUPP, NONE_AMS, PD_T_CHUNK_NOT_SUPP);
2923                 tcpm_log(port, "Chunk handling not yet supported");
2924                 return;
2925         }
2926
2927         switch (type) {
2928         case PD_EXT_STATUS:
2929         case PD_EXT_PPS_STATUS:
2930                 if (port->ams == GETTING_SOURCE_SINK_STATUS) {
2931                         tcpm_ams_finish(port);
2932                         tcpm_set_state(port, ready_state(port), 0);
2933                 } else {
2934                         /* unexpected Status or PPS_Status Message */
2935                         tcpm_pd_handle_state(port, port->pwr_role == TYPEC_SOURCE ?
2936                                              SRC_SOFT_RESET_WAIT_SNK_TX : SNK_SOFT_RESET,
2937                                              NONE_AMS, 0);
2938                 }
2939                 break;
2940         case PD_EXT_SOURCE_CAP_EXT:
2941         case PD_EXT_GET_BATT_CAP:
2942         case PD_EXT_GET_BATT_STATUS:
2943         case PD_EXT_BATT_CAP:
2944         case PD_EXT_GET_MANUFACTURER_INFO:
2945         case PD_EXT_MANUFACTURER_INFO:
2946         case PD_EXT_SECURITY_REQUEST:
2947         case PD_EXT_SECURITY_RESPONSE:
2948         case PD_EXT_FW_UPDATE_REQUEST:
2949         case PD_EXT_FW_UPDATE_RESPONSE:
2950         case PD_EXT_COUNTRY_INFO:
2951         case PD_EXT_COUNTRY_CODES:
2952                 tcpm_pd_handle_msg(port, PD_MSG_CTRL_NOT_SUPP, NONE_AMS);
2953                 break;
2954         default:
2955                 tcpm_pd_handle_msg(port, PD_MSG_CTRL_NOT_SUPP, NONE_AMS);
2956                 tcpm_log(port, "Unrecognized extended message type %#x", type);
2957                 break;
2958         }
2959 }
2960
2961 static void tcpm_pd_rx_handler(struct kthread_work *work)
2962 {
2963         struct pd_rx_event *event = container_of(work,
2964                                                  struct pd_rx_event, work);
2965         const struct pd_message *msg = &event->msg;
2966         unsigned int cnt = pd_header_cnt_le(msg->header);
2967         struct tcpm_port *port = event->port;
2968
2969         mutex_lock(&port->lock);
2970
2971         tcpm_log(port, "PD RX, header: %#x [%d]", le16_to_cpu(msg->header),
2972                  port->attached);
2973
2974         if (port->attached) {
2975                 enum pd_ctrl_msg_type type = pd_header_type_le(msg->header);
2976                 unsigned int msgid = pd_header_msgid_le(msg->header);
2977
2978                 /*
2979                  * USB PD standard, 6.6.1.2:
2980                  * "... if MessageID value in a received Message is the
2981                  * same as the stored value, the receiver shall return a
2982                  * GoodCRC Message with that MessageID value and drop
2983                  * the Message (this is a retry of an already received
2984                  * Message). Note: this shall not apply to the Soft_Reset
2985                  * Message which always has a MessageID value of zero."
2986                  */
2987                 if (msgid == port->rx_msgid && type != PD_CTRL_SOFT_RESET)
2988                         goto done;
2989                 port->rx_msgid = msgid;
2990
2991                 /*
2992                  * If both ends believe to be DFP/host, we have a data role
2993                  * mismatch.
2994                  */
2995                 if (!!(le16_to_cpu(msg->header) & PD_HEADER_DATA_ROLE) ==
2996                     (port->data_role == TYPEC_HOST)) {
2997                         tcpm_log(port,
2998                                  "Data role mismatch, initiating error recovery");
2999                         tcpm_set_state(port, ERROR_RECOVERY, 0);
3000                 } else {
3001                         if (le16_to_cpu(msg->header) & PD_HEADER_EXT_HDR)
3002                                 tcpm_pd_ext_msg_request(port, msg);
3003                         else if (cnt)
3004                                 tcpm_pd_data_request(port, msg);
3005                         else
3006                                 tcpm_pd_ctrl_request(port, msg);
3007                 }
3008         }
3009
3010 done:
3011         mutex_unlock(&port->lock);
3012         kfree(event);
3013 }
3014
3015 void tcpm_pd_receive(struct tcpm_port *port, const struct pd_message *msg)
3016 {
3017         struct pd_rx_event *event;
3018
3019         event = kzalloc(sizeof(*event), GFP_ATOMIC);
3020         if (!event)
3021                 return;
3022
3023         kthread_init_work(&event->work, tcpm_pd_rx_handler);
3024         event->port = port;
3025         memcpy(&event->msg, msg, sizeof(*msg));
3026         kthread_queue_work(port->wq, &event->work);
3027 }
3028 EXPORT_SYMBOL_GPL(tcpm_pd_receive);
3029
3030 static int tcpm_pd_send_control(struct tcpm_port *port,
3031                                 enum pd_ctrl_msg_type type)
3032 {
3033         struct pd_message msg;
3034
3035         memset(&msg, 0, sizeof(msg));
3036         msg.header = PD_HEADER_LE(type, port->pwr_role,
3037                                   port->data_role,
3038                                   port->negotiated_rev,
3039                                   port->message_id, 0);
3040
3041         return tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
3042 }
3043
3044 /*
3045  * Send queued message without affecting state.
3046  * Return true if state machine should go back to sleep,
3047  * false otherwise.
3048  */
3049 static bool tcpm_send_queued_message(struct tcpm_port *port)
3050 {
3051         enum pd_msg_request queued_message;
3052         int ret;
3053
3054         do {
3055                 queued_message = port->queued_message;
3056                 port->queued_message = PD_MSG_NONE;
3057
3058                 switch (queued_message) {
3059                 case PD_MSG_CTRL_WAIT:
3060                         tcpm_pd_send_control(port, PD_CTRL_WAIT);
3061                         break;
3062                 case PD_MSG_CTRL_REJECT:
3063                         tcpm_pd_send_control(port, PD_CTRL_REJECT);
3064                         break;
3065                 case PD_MSG_CTRL_NOT_SUPP:
3066                         tcpm_pd_send_control(port, PD_CTRL_NOT_SUPP);
3067                         break;
3068                 case PD_MSG_DATA_SINK_CAP:
3069                         ret = tcpm_pd_send_sink_caps(port);
3070                         if (ret < 0) {
3071                                 tcpm_log(port, "Unable to send snk caps, ret=%d", ret);
3072                                 tcpm_set_state(port, SNK_SOFT_RESET, 0);
3073                         }
3074                         tcpm_ams_finish(port);
3075                         break;
3076                 case PD_MSG_DATA_SOURCE_CAP:
3077                         ret = tcpm_pd_send_source_caps(port);
3078                         if (ret < 0) {
3079                                 tcpm_log(port,
3080                                          "Unable to send src caps, ret=%d",
3081                                          ret);
3082                                 tcpm_set_state(port, SOFT_RESET_SEND, 0);
3083                         } else if (port->pwr_role == TYPEC_SOURCE) {
3084                                 tcpm_ams_finish(port);
3085                                 tcpm_set_state(port, HARD_RESET_SEND,
3086                                                PD_T_SENDER_RESPONSE);
3087                         } else {
3088                                 tcpm_ams_finish(port);
3089                         }
3090                         break;
3091                 default:
3092                         break;
3093                 }
3094         } while (port->queued_message != PD_MSG_NONE);
3095
3096         if (port->delayed_state != INVALID_STATE) {
3097                 if (ktime_after(port->delayed_runtime, ktime_get())) {
3098                         mod_tcpm_delayed_work(port, ktime_to_ms(ktime_sub(port->delayed_runtime,
3099                                                                           ktime_get())));
3100                         return true;
3101                 }
3102                 port->delayed_state = INVALID_STATE;
3103         }
3104         return false;
3105 }
3106
3107 static int tcpm_pd_check_request(struct tcpm_port *port)
3108 {
3109         u32 pdo, rdo = port->sink_request;
3110         unsigned int max, op, pdo_max, index;
3111         enum pd_pdo_type type;
3112
3113         index = rdo_index(rdo);
3114         if (!index || index > port->nr_src_pdo)
3115                 return -EINVAL;
3116
3117         pdo = port->src_pdo[index - 1];
3118         type = pdo_type(pdo);
3119         switch (type) {
3120         case PDO_TYPE_FIXED:
3121         case PDO_TYPE_VAR:
3122                 max = rdo_max_current(rdo);
3123                 op = rdo_op_current(rdo);
3124                 pdo_max = pdo_max_current(pdo);
3125
3126                 if (op > pdo_max)
3127                         return -EINVAL;
3128                 if (max > pdo_max && !(rdo & RDO_CAP_MISMATCH))
3129                         return -EINVAL;
3130
3131                 if (type == PDO_TYPE_FIXED)
3132                         tcpm_log(port,
3133                                  "Requested %u mV, %u mA for %u / %u mA",
3134                                  pdo_fixed_voltage(pdo), pdo_max, op, max);
3135                 else
3136                         tcpm_log(port,
3137                                  "Requested %u -> %u mV, %u mA for %u / %u mA",
3138                                  pdo_min_voltage(pdo), pdo_max_voltage(pdo),
3139                                  pdo_max, op, max);
3140                 break;
3141         case PDO_TYPE_BATT:
3142                 max = rdo_max_power(rdo);
3143                 op = rdo_op_power(rdo);
3144                 pdo_max = pdo_max_power(pdo);
3145
3146                 if (op > pdo_max)
3147                         return -EINVAL;
3148                 if (max > pdo_max && !(rdo & RDO_CAP_MISMATCH))
3149                         return -EINVAL;
3150                 tcpm_log(port,
3151                          "Requested %u -> %u mV, %u mW for %u / %u mW",
3152                          pdo_min_voltage(pdo), pdo_max_voltage(pdo),
3153                          pdo_max, op, max);
3154                 break;
3155         default:
3156                 return -EINVAL;
3157         }
3158
3159         port->op_vsafe5v = index == 1;
3160
3161         return 0;
3162 }
3163
3164 #define min_power(x, y) min(pdo_max_power(x), pdo_max_power(y))
3165 #define min_current(x, y) min(pdo_max_current(x), pdo_max_current(y))
3166
3167 static int tcpm_pd_select_pdo(struct tcpm_port *port, int *sink_pdo,
3168                               int *src_pdo)
3169 {
3170         unsigned int i, j, max_src_mv = 0, min_src_mv = 0, max_mw = 0,
3171                      max_mv = 0, src_mw = 0, src_ma = 0, max_snk_mv = 0,
3172                      min_snk_mv = 0;
3173         int ret = -EINVAL;
3174
3175         port->pps_data.supported = false;
3176         port->usb_type = POWER_SUPPLY_USB_TYPE_PD;
3177         power_supply_changed(port->psy);
3178
3179         /*
3180          * Select the source PDO providing the most power which has a
3181          * matchig sink cap.
3182          */
3183         for (i = 0; i < port->nr_source_caps; i++) {
3184                 u32 pdo = port->source_caps[i];
3185                 enum pd_pdo_type type = pdo_type(pdo);
3186
3187                 switch (type) {
3188                 case PDO_TYPE_FIXED:
3189                         max_src_mv = pdo_fixed_voltage(pdo);
3190                         min_src_mv = max_src_mv;
3191                         break;
3192                 case PDO_TYPE_BATT:
3193                 case PDO_TYPE_VAR:
3194                         max_src_mv = pdo_max_voltage(pdo);
3195                         min_src_mv = pdo_min_voltage(pdo);
3196                         break;
3197                 case PDO_TYPE_APDO:
3198                         if (pdo_apdo_type(pdo) == APDO_TYPE_PPS) {
3199                                 port->pps_data.supported = true;
3200                                 port->usb_type =
3201                                         POWER_SUPPLY_USB_TYPE_PD_PPS;
3202                                 power_supply_changed(port->psy);
3203                         }
3204                         continue;
3205                 default:
3206                         tcpm_log(port, "Invalid source PDO type, ignoring");
3207                         continue;
3208                 }
3209
3210                 switch (type) {
3211                 case PDO_TYPE_FIXED:
3212                 case PDO_TYPE_VAR:
3213                         src_ma = pdo_max_current(pdo);
3214                         src_mw = src_ma * min_src_mv / 1000;
3215                         break;
3216                 case PDO_TYPE_BATT:
3217                         src_mw = pdo_max_power(pdo);
3218                         break;
3219                 case PDO_TYPE_APDO:
3220                         continue;
3221                 default:
3222                         tcpm_log(port, "Invalid source PDO type, ignoring");
3223                         continue;
3224                 }
3225
3226                 for (j = 0; j < port->nr_snk_pdo; j++) {
3227                         pdo = port->snk_pdo[j];
3228
3229                         switch (pdo_type(pdo)) {
3230                         case PDO_TYPE_FIXED:
3231                                 max_snk_mv = pdo_fixed_voltage(pdo);
3232                                 min_snk_mv = max_snk_mv;
3233                                 break;
3234                         case PDO_TYPE_BATT:
3235                         case PDO_TYPE_VAR:
3236                                 max_snk_mv = pdo_max_voltage(pdo);
3237                                 min_snk_mv = pdo_min_voltage(pdo);
3238                                 break;
3239                         case PDO_TYPE_APDO:
3240                                 continue;
3241                         default:
3242                                 tcpm_log(port, "Invalid sink PDO type, ignoring");
3243                                 continue;
3244                         }
3245
3246                         if (max_src_mv <= max_snk_mv &&
3247                                 min_src_mv >= min_snk_mv) {
3248                                 /* Prefer higher voltages if available */
3249                                 if ((src_mw == max_mw && min_src_mv > max_mv) ||
3250                                                         src_mw > max_mw) {
3251                                         *src_pdo = i;
3252                                         *sink_pdo = j;
3253                                         max_mw = src_mw;
3254                                         max_mv = min_src_mv;
3255                                         ret = 0;
3256                                 }
3257                         }
3258                 }
3259         }
3260
3261         return ret;
3262 }
3263
3264 static unsigned int tcpm_pd_select_pps_apdo(struct tcpm_port *port)
3265 {
3266         unsigned int i, src_ma, max_temp_mw = 0, max_op_ma, op_mw;
3267         unsigned int src_pdo = 0;
3268         u32 pdo, src;
3269
3270         for (i = 1; i < port->nr_source_caps; ++i) {
3271                 pdo = port->source_caps[i];
3272
3273                 switch (pdo_type(pdo)) {
3274                 case PDO_TYPE_APDO:
3275                         if (pdo_apdo_type(pdo) != APDO_TYPE_PPS) {
3276                                 tcpm_log(port, "Not PPS APDO (source), ignoring");
3277                                 continue;
3278                         }
3279
3280                         if (port->pps_data.req_out_volt > pdo_pps_apdo_max_voltage(pdo) ||
3281                             port->pps_data.req_out_volt < pdo_pps_apdo_min_voltage(pdo))
3282                                 continue;
3283
3284                         src_ma = pdo_pps_apdo_max_current(pdo);
3285                         max_op_ma = min(src_ma, port->pps_data.req_op_curr);
3286                         op_mw = max_op_ma * port->pps_data.req_out_volt / 1000;
3287                         if (op_mw > max_temp_mw) {
3288                                 src_pdo = i;
3289                                 max_temp_mw = op_mw;
3290                         }
3291                         break;
3292                 default:
3293                         tcpm_log(port, "Not APDO type (source), ignoring");
3294                         continue;
3295                 }
3296         }
3297
3298         if (src_pdo) {
3299                 src = port->source_caps[src_pdo];
3300
3301                 port->pps_data.req_min_volt = pdo_pps_apdo_min_voltage(src);
3302                 port->pps_data.req_max_volt = pdo_pps_apdo_max_voltage(src);
3303                 port->pps_data.req_max_curr = pdo_pps_apdo_max_current(src);
3304                 port->pps_data.req_op_curr = min(port->pps_data.req_max_curr,
3305                                                  port->pps_data.req_op_curr);
3306         }
3307
3308         return src_pdo;
3309 }
3310
3311 static int tcpm_pd_build_request(struct tcpm_port *port, u32 *rdo)
3312 {
3313         unsigned int mv, ma, mw, flags;
3314         unsigned int max_ma, max_mw;
3315         enum pd_pdo_type type;
3316         u32 pdo, matching_snk_pdo;
3317         int src_pdo_index = 0;
3318         int snk_pdo_index = 0;
3319         int ret;
3320
3321         ret = tcpm_pd_select_pdo(port, &snk_pdo_index, &src_pdo_index);
3322         if (ret < 0)
3323                 return ret;
3324
3325         pdo = port->source_caps[src_pdo_index];
3326         matching_snk_pdo = port->snk_pdo[snk_pdo_index];
3327         type = pdo_type(pdo);
3328
3329         switch (type) {
3330         case PDO_TYPE_FIXED:
3331                 mv = pdo_fixed_voltage(pdo);
3332                 break;
3333         case PDO_TYPE_BATT:
3334         case PDO_TYPE_VAR:
3335                 mv = pdo_min_voltage(pdo);
3336                 break;
3337         default:
3338                 tcpm_log(port, "Invalid PDO selected!");
3339                 return -EINVAL;
3340         }
3341
3342         /* Select maximum available current within the sink pdo's limit */
3343         if (type == PDO_TYPE_BATT) {
3344                 mw = min_power(pdo, matching_snk_pdo);
3345                 ma = 1000 * mw / mv;
3346         } else {
3347                 ma = min_current(pdo, matching_snk_pdo);
3348                 mw = ma * mv / 1000;
3349         }
3350
3351         flags = RDO_USB_COMM | RDO_NO_SUSPEND;
3352
3353         /* Set mismatch bit if offered power is less than operating power */
3354         max_ma = ma;
3355         max_mw = mw;
3356         if (mw < port->operating_snk_mw) {
3357                 flags |= RDO_CAP_MISMATCH;
3358                 if (type == PDO_TYPE_BATT &&
3359                     (pdo_max_power(matching_snk_pdo) > pdo_max_power(pdo)))
3360                         max_mw = pdo_max_power(matching_snk_pdo);
3361                 else if (pdo_max_current(matching_snk_pdo) >
3362                          pdo_max_current(pdo))
3363                         max_ma = pdo_max_current(matching_snk_pdo);
3364         }
3365
3366         tcpm_log(port, "cc=%d cc1=%d cc2=%d vbus=%d vconn=%s polarity=%d",
3367                  port->cc_req, port->cc1, port->cc2, port->vbus_source,
3368                  port->vconn_role == TYPEC_SOURCE ? "source" : "sink",
3369                  port->polarity);
3370
3371         if (type == PDO_TYPE_BATT) {
3372                 *rdo = RDO_BATT(src_pdo_index + 1, mw, max_mw, flags);
3373
3374                 tcpm_log(port, "Requesting PDO %d: %u mV, %u mW%s",
3375                          src_pdo_index, mv, mw,
3376                          flags & RDO_CAP_MISMATCH ? " [mismatch]" : "");
3377         } else {
3378                 *rdo = RDO_FIXED(src_pdo_index + 1, ma, max_ma, flags);
3379
3380                 tcpm_log(port, "Requesting PDO %d: %u mV, %u mA%s",
3381                          src_pdo_index, mv, ma,
3382                          flags & RDO_CAP_MISMATCH ? " [mismatch]" : "");
3383         }
3384
3385         port->req_current_limit = ma;
3386         port->req_supply_voltage = mv;
3387
3388         return 0;
3389 }
3390
3391 static int tcpm_pd_send_request(struct tcpm_port *port)
3392 {
3393         struct pd_message msg;
3394         int ret;
3395         u32 rdo;
3396
3397         ret = tcpm_pd_build_request(port, &rdo);
3398         if (ret < 0)
3399                 return ret;
3400
3401         /*
3402          * Relax the threshold as voltage will be adjusted after Accept Message plus tSrcTransition.
3403          * It is safer to modify the threshold here.
3404          */
3405         tcpm_set_auto_vbus_discharge_threshold(port, TYPEC_PWR_MODE_USB, false, 0);
3406
3407         memset(&msg, 0, sizeof(msg));
3408         msg.header = PD_HEADER_LE(PD_DATA_REQUEST,
3409                                   port->pwr_role,
3410                                   port->data_role,
3411                                   port->negotiated_rev,
3412                                   port->message_id, 1);
3413         msg.payload[0] = cpu_to_le32(rdo);
3414
3415         return tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
3416 }
3417
3418 static int tcpm_pd_build_pps_request(struct tcpm_port *port, u32 *rdo)
3419 {
3420         unsigned int out_mv, op_ma, op_mw, max_mv, max_ma, flags;
3421         unsigned int src_pdo_index;
3422
3423         src_pdo_index = tcpm_pd_select_pps_apdo(port);
3424         if (!src_pdo_index)
3425                 return -EOPNOTSUPP;
3426
3427         max_mv = port->pps_data.req_max_volt;
3428         max_ma = port->pps_data.req_max_curr;
3429         out_mv = port->pps_data.req_out_volt;
3430         op_ma = port->pps_data.req_op_curr;
3431
3432         flags = RDO_USB_COMM | RDO_NO_SUSPEND;
3433
3434         op_mw = (op_ma * out_mv) / 1000;
3435         if (op_mw < port->operating_snk_mw) {
3436                 /*
3437                  * Try raising current to meet power needs. If that's not enough
3438                  * then try upping the voltage. If that's still not enough
3439                  * then we've obviously chosen a PPS APDO which really isn't
3440                  * suitable so abandon ship.
3441                  */
3442                 op_ma = (port->operating_snk_mw * 1000) / out_mv;
3443                 if ((port->operating_snk_mw * 1000) % out_mv)
3444                         ++op_ma;
3445                 op_ma += RDO_PROG_CURR_MA_STEP - (op_ma % RDO_PROG_CURR_MA_STEP);
3446
3447                 if (op_ma > max_ma) {
3448                         op_ma = max_ma;
3449                         out_mv = (port->operating_snk_mw * 1000) / op_ma;
3450                         if ((port->operating_snk_mw * 1000) % op_ma)
3451                                 ++out_mv;
3452                         out_mv += RDO_PROG_VOLT_MV_STEP -
3453                                   (out_mv % RDO_PROG_VOLT_MV_STEP);
3454
3455                         if (out_mv > max_mv) {
3456                                 tcpm_log(port, "Invalid PPS APDO selected!");
3457                                 return -EINVAL;
3458                         }
3459                 }
3460         }
3461
3462         tcpm_log(port, "cc=%d cc1=%d cc2=%d vbus=%d vconn=%s polarity=%d",
3463                  port->cc_req, port->cc1, port->cc2, port->vbus_source,
3464                  port->vconn_role == TYPEC_SOURCE ? "source" : "sink",
3465                  port->polarity);
3466
3467         *rdo = RDO_PROG(src_pdo_index + 1, out_mv, op_ma, flags);
3468
3469         tcpm_log(port, "Requesting APDO %d: %u mV, %u mA",
3470                  src_pdo_index, out_mv, op_ma);
3471
3472         port->pps_data.req_op_curr = op_ma;
3473         port->pps_data.req_out_volt = out_mv;
3474
3475         return 0;
3476 }
3477
3478 static int tcpm_pd_send_pps_request(struct tcpm_port *port)
3479 {
3480         struct pd_message msg;
3481         int ret;
3482         u32 rdo;
3483
3484         ret = tcpm_pd_build_pps_request(port, &rdo);
3485         if (ret < 0)
3486                 return ret;
3487
3488         /* Relax the threshold as voltage will be adjusted right after Accept Message. */
3489         tcpm_set_auto_vbus_discharge_threshold(port, TYPEC_PWR_MODE_USB, false, 0);
3490
3491         memset(&msg, 0, sizeof(msg));
3492         msg.header = PD_HEADER_LE(PD_DATA_REQUEST,
3493                                   port->pwr_role,
3494                                   port->data_role,
3495                                   port->negotiated_rev,
3496                                   port->message_id, 1);
3497         msg.payload[0] = cpu_to_le32(rdo);
3498
3499         return tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
3500 }
3501
3502 static int tcpm_set_vbus(struct tcpm_port *port, bool enable)
3503 {
3504         int ret;
3505
3506         if (enable && port->vbus_charge)
3507                 return -EINVAL;
3508
3509         tcpm_log(port, "vbus:=%d charge=%d", enable, port->vbus_charge);
3510
3511         ret = port->tcpc->set_vbus(port->tcpc, enable, port->vbus_charge);
3512         if (ret < 0)
3513                 return ret;
3514
3515         port->vbus_source = enable;
3516         return 0;
3517 }
3518
3519 static int tcpm_set_charge(struct tcpm_port *port, bool charge)
3520 {
3521         int ret;
3522
3523         if (charge && port->vbus_source)
3524                 return -EINVAL;
3525
3526         if (charge != port->vbus_charge) {
3527                 tcpm_log(port, "vbus=%d charge:=%d", port->vbus_source, charge);
3528                 ret = port->tcpc->set_vbus(port->tcpc, port->vbus_source,
3529                                            charge);
3530                 if (ret < 0)
3531                         return ret;
3532         }
3533         port->vbus_charge = charge;
3534         power_supply_changed(port->psy);
3535         return 0;
3536 }
3537
3538 static bool tcpm_start_toggling(struct tcpm_port *port, enum typec_cc_status cc)
3539 {
3540         int ret;
3541
3542         if (!port->tcpc->start_toggling)
3543                 return false;
3544
3545         tcpm_log_force(port, "Start toggling");
3546         ret = port->tcpc->start_toggling(port->tcpc, port->port_type, cc);
3547         return ret == 0;
3548 }
3549
3550 static int tcpm_init_vbus(struct tcpm_port *port)
3551 {
3552         int ret;
3553
3554         ret = port->tcpc->set_vbus(port->tcpc, false, false);
3555         port->vbus_source = false;
3556         port->vbus_charge = false;
3557         return ret;
3558 }
3559
3560 static int tcpm_init_vconn(struct tcpm_port *port)
3561 {
3562         int ret;
3563
3564         ret = port->tcpc->set_vconn(port->tcpc, false);
3565         port->vconn_role = TYPEC_SINK;
3566         return ret;
3567 }
3568
3569 static void tcpm_typec_connect(struct tcpm_port *port)
3570 {
3571         if (!port->connected) {
3572                 /* Make sure we don't report stale identity information */
3573                 memset(&port->partner_ident, 0, sizeof(port->partner_ident));
3574                 port->partner_desc.usb_pd = port->pd_capable;
3575                 if (tcpm_port_is_debug(port))
3576                         port->partner_desc.accessory = TYPEC_ACCESSORY_DEBUG;
3577                 else if (tcpm_port_is_audio(port))
3578                         port->partner_desc.accessory = TYPEC_ACCESSORY_AUDIO;
3579                 else
3580                         port->partner_desc.accessory = TYPEC_ACCESSORY_NONE;
3581                 port->partner = typec_register_partner(port->typec_port,
3582                                                        &port->partner_desc);
3583                 port->connected = true;
3584                 typec_partner_set_usb_power_delivery(port->partner, port->partner_pd);
3585         }
3586 }
3587
3588 static int tcpm_src_attach(struct tcpm_port *port)
3589 {
3590         enum typec_cc_polarity polarity =
3591                                 port->cc2 == TYPEC_CC_RD ? TYPEC_POLARITY_CC2
3592                                                          : TYPEC_POLARITY_CC1;
3593         int ret;
3594
3595         if (port->attached)
3596                 return 0;
3597
3598         ret = tcpm_set_polarity(port, polarity);
3599         if (ret < 0)
3600                 return ret;
3601
3602         tcpm_enable_auto_vbus_discharge(port, true);
3603
3604         ret = tcpm_set_roles(port, true, TYPEC_SOURCE, tcpm_data_role_for_source(port));
3605         if (ret < 0)
3606                 return ret;
3607
3608         if (port->pd_supported) {
3609                 ret = port->tcpc->set_pd_rx(port->tcpc, true);
3610                 if (ret < 0)
3611                         goto out_disable_mux;
3612         }
3613
3614         /*
3615          * USB Type-C specification, version 1.2,
3616          * chapter 4.5.2.2.8.1 (Attached.SRC Requirements)
3617          * Enable VCONN only if the non-RD port is set to RA.
3618          */
3619         if ((polarity == TYPEC_POLARITY_CC1 && port->cc2 == TYPEC_CC_RA) ||
3620             (polarity == TYPEC_POLARITY_CC2 && port->cc1 == TYPEC_CC_RA)) {
3621                 ret = tcpm_set_vconn(port, true);
3622                 if (ret < 0)
3623                         goto out_disable_pd;
3624         }
3625
3626         ret = tcpm_set_vbus(port, true);
3627         if (ret < 0)
3628                 goto out_disable_vconn;
3629
3630         port->pd_capable = false;
3631
3632         port->partner = NULL;
3633
3634         port->attached = true;
3635         port->send_discover = true;
3636
3637         return 0;
3638
3639 out_disable_vconn:
3640         tcpm_set_vconn(port, false);
3641 out_disable_pd:
3642         if (port->pd_supported)
3643                 port->tcpc->set_pd_rx(port->tcpc, false);
3644 out_disable_mux:
3645         tcpm_mux_set(port, TYPEC_STATE_SAFE, USB_ROLE_NONE,
3646                      TYPEC_ORIENTATION_NONE);
3647         return ret;
3648 }
3649
3650 static void tcpm_typec_disconnect(struct tcpm_port *port)
3651 {
3652         if (port->connected) {
3653                 typec_partner_set_usb_power_delivery(port->partner, NULL);
3654                 typec_unregister_partner(port->partner);
3655                 port->partner = NULL;
3656                 port->connected = false;
3657         }
3658 }
3659
3660 static void tcpm_unregister_altmodes(struct tcpm_port *port)
3661 {
3662         struct pd_mode_data *modep = &port->mode_data;
3663         int i;
3664
3665         for (i = 0; i < modep->altmodes; i++) {
3666                 typec_unregister_altmode(port->partner_altmode[i]);
3667                 port->partner_altmode[i] = NULL;
3668         }
3669
3670         memset(modep, 0, sizeof(*modep));
3671 }
3672
3673 static void tcpm_set_partner_usb_comm_capable(struct tcpm_port *port, bool capable)
3674 {
3675         tcpm_log(port, "Setting usb_comm capable %s", capable ? "true" : "false");
3676
3677         if (port->tcpc->set_partner_usb_comm_capable)
3678                 port->tcpc->set_partner_usb_comm_capable(port->tcpc, capable);
3679 }
3680
3681 static void tcpm_reset_port(struct tcpm_port *port)
3682 {
3683         tcpm_enable_auto_vbus_discharge(port, false);
3684         port->in_ams = false;
3685         port->ams = NONE_AMS;
3686         port->vdm_sm_running = false;
3687         tcpm_unregister_altmodes(port);
3688         tcpm_typec_disconnect(port);
3689         port->attached = false;
3690         port->pd_capable = false;
3691         port->pps_data.supported = false;
3692         tcpm_set_partner_usb_comm_capable(port, false);
3693
3694         /*
3695          * First Rx ID should be 0; set this to a sentinel of -1 so that
3696          * we can check tcpm_pd_rx_handler() if we had seen it before.
3697          */
3698         port->rx_msgid = -1;
3699
3700         port->tcpc->set_pd_rx(port->tcpc, false);
3701         tcpm_init_vbus(port);   /* also disables charging */
3702         tcpm_init_vconn(port);
3703         tcpm_set_current_limit(port, 0, 0);
3704         tcpm_set_polarity(port, TYPEC_POLARITY_CC1);
3705         tcpm_mux_set(port, TYPEC_STATE_SAFE, USB_ROLE_NONE,
3706                      TYPEC_ORIENTATION_NONE);
3707         tcpm_set_attached_state(port, false);
3708         port->try_src_count = 0;
3709         port->try_snk_count = 0;
3710         port->usb_type = POWER_SUPPLY_USB_TYPE_C;
3711         power_supply_changed(port->psy);
3712         port->nr_sink_caps = 0;
3713         port->sink_cap_done = false;
3714         if (port->tcpc->enable_frs)
3715                 port->tcpc->enable_frs(port->tcpc, false);
3716
3717         usb_power_delivery_unregister_capabilities(port->partner_sink_caps);
3718         port->partner_sink_caps = NULL;
3719         usb_power_delivery_unregister_capabilities(port->partner_source_caps);
3720         port->partner_source_caps = NULL;
3721         usb_power_delivery_unregister(port->partner_pd);
3722         port->partner_pd = NULL;
3723 }
3724
3725 static void tcpm_detach(struct tcpm_port *port)
3726 {
3727         if (tcpm_port_is_disconnected(port))
3728                 port->hard_reset_count = 0;
3729
3730         port->try_src_count = 0;
3731         port->try_snk_count = 0;
3732
3733         if (!port->attached)
3734                 return;
3735
3736         if (port->tcpc->set_bist_data) {
3737                 tcpm_log(port, "disable BIST MODE TESTDATA");
3738                 port->tcpc->set_bist_data(port->tcpc, false);
3739         }
3740
3741         tcpm_reset_port(port);
3742 }
3743
3744 static void tcpm_src_detach(struct tcpm_port *port)
3745 {
3746         tcpm_detach(port);
3747 }
3748
3749 static int tcpm_snk_attach(struct tcpm_port *port)
3750 {
3751         int ret;
3752
3753         if (port->attached)
3754                 return 0;
3755
3756         ret = tcpm_set_polarity(port, port->cc2 != TYPEC_CC_OPEN ?
3757                                 TYPEC_POLARITY_CC2 : TYPEC_POLARITY_CC1);
3758         if (ret < 0)
3759                 return ret;
3760
3761         tcpm_enable_auto_vbus_discharge(port, true);
3762
3763         ret = tcpm_set_roles(port, true, TYPEC_SINK, tcpm_data_role_for_sink(port));
3764         if (ret < 0)
3765                 return ret;
3766
3767         port->pd_capable = false;
3768
3769         port->partner = NULL;
3770
3771         port->attached = true;
3772         port->send_discover = true;
3773
3774         return 0;
3775 }
3776
3777 static void tcpm_snk_detach(struct tcpm_port *port)
3778 {
3779         tcpm_detach(port);
3780 }
3781
3782 static int tcpm_acc_attach(struct tcpm_port *port)
3783 {
3784         int ret;
3785
3786         if (port->attached)
3787                 return 0;
3788
3789         ret = tcpm_set_roles(port, true, TYPEC_SOURCE,
3790                              tcpm_data_role_for_source(port));
3791         if (ret < 0)
3792                 return ret;
3793
3794         port->partner = NULL;
3795
3796         tcpm_typec_connect(port);
3797
3798         port->attached = true;
3799
3800         return 0;
3801 }
3802
3803 static void tcpm_acc_detach(struct tcpm_port *port)
3804 {
3805         tcpm_detach(port);
3806 }
3807
3808 static inline enum tcpm_state hard_reset_state(struct tcpm_port *port)
3809 {
3810         if (port->hard_reset_count < PD_N_HARD_RESET_COUNT)
3811                 return HARD_RESET_SEND;
3812         if (port->pd_capable)
3813                 return ERROR_RECOVERY;
3814         if (port->pwr_role == TYPEC_SOURCE)
3815                 return SRC_UNATTACHED;
3816         if (port->state == SNK_WAIT_CAPABILITIES)
3817                 return SNK_READY;
3818         return SNK_UNATTACHED;
3819 }
3820
3821 static inline enum tcpm_state unattached_state(struct tcpm_port *port)
3822 {
3823         if (port->port_type == TYPEC_PORT_DRP) {
3824                 if (port->pwr_role == TYPEC_SOURCE)
3825                         return SRC_UNATTACHED;
3826                 else
3827                         return SNK_UNATTACHED;
3828         } else if (port->port_type == TYPEC_PORT_SRC) {
3829                 return SRC_UNATTACHED;
3830         }
3831
3832         return SNK_UNATTACHED;
3833 }
3834
3835 static void tcpm_swap_complete(struct tcpm_port *port, int result)
3836 {
3837         if (port->swap_pending) {
3838                 port->swap_status = result;
3839                 port->swap_pending = false;
3840                 port->non_pd_role_swap = false;
3841                 complete(&port->swap_complete);
3842         }
3843 }
3844
3845 static enum typec_pwr_opmode tcpm_get_pwr_opmode(enum typec_cc_status cc)
3846 {
3847         switch (cc) {
3848         case TYPEC_CC_RP_1_5:
3849                 return TYPEC_PWR_MODE_1_5A;
3850         case TYPEC_CC_RP_3_0:
3851                 return TYPEC_PWR_MODE_3_0A;
3852         case TYPEC_CC_RP_DEF:
3853         default:
3854                 return TYPEC_PWR_MODE_USB;
3855         }
3856 }
3857
3858 static enum typec_cc_status tcpm_pwr_opmode_to_rp(enum typec_pwr_opmode opmode)
3859 {
3860         switch (opmode) {
3861         case TYPEC_PWR_MODE_USB:
3862                 return TYPEC_CC_RP_DEF;
3863         case TYPEC_PWR_MODE_1_5A:
3864                 return TYPEC_CC_RP_1_5;
3865         case TYPEC_PWR_MODE_3_0A:
3866         case TYPEC_PWR_MODE_PD:
3867         default:
3868                 return TYPEC_CC_RP_3_0;
3869         }
3870 }
3871
3872 static void tcpm_set_initial_svdm_version(struct tcpm_port *port)
3873 {
3874         switch (port->negotiated_rev) {
3875         case PD_REV30:
3876                 break;
3877         /*
3878          * 6.4.4.2.3 Structured VDM Version
3879          * 2.0 states "At this time, there is only one version (1.0) defined.
3880          * This field Shall be set to zero to indicate Version 1.0."
3881          * 3.0 states "This field Shall be set to 01b to indicate Version 2.0."
3882          * To ensure that we follow the Power Delivery revision we are currently
3883          * operating on, downgrade the SVDM version to the highest one supported
3884          * by the Power Delivery revision.
3885          */
3886         case PD_REV20:
3887                 typec_partner_set_svdm_version(port->partner, SVDM_VER_1_0);
3888                 break;
3889         default:
3890                 typec_partner_set_svdm_version(port->partner, SVDM_VER_1_0);
3891                 break;
3892         }
3893 }
3894
3895 static void run_state_machine(struct tcpm_port *port)
3896 {
3897         int ret;
3898         enum typec_pwr_opmode opmode;
3899         unsigned int msecs;
3900         enum tcpm_state upcoming_state;
3901
3902         if (port->tcpc->check_contaminant && port->state != CHECK_CONTAMINANT)
3903                 port->potential_contaminant = ((port->enter_state == SRC_ATTACH_WAIT &&
3904                                                 port->state == SRC_UNATTACHED) ||
3905                                                (port->enter_state == SNK_ATTACH_WAIT &&
3906                                                 port->state == SNK_UNATTACHED) ||
3907                                                (port->enter_state == SNK_DEBOUNCED &&
3908                                                 port->state == SNK_UNATTACHED));
3909
3910         port->enter_state = port->state;
3911         switch (port->state) {
3912         case TOGGLING:
3913                 break;
3914         case CHECK_CONTAMINANT:
3915                 port->tcpc->check_contaminant(port->tcpc);
3916                 break;
3917         /* SRC states */
3918         case SRC_UNATTACHED:
3919                 if (!port->non_pd_role_swap)
3920                         tcpm_swap_complete(port, -ENOTCONN);
3921                 tcpm_src_detach(port);
3922                 if (port->potential_contaminant) {
3923                         tcpm_set_state(port, CHECK_CONTAMINANT, 0);
3924                         break;
3925                 }
3926                 if (tcpm_start_toggling(port, tcpm_rp_cc(port))) {
3927                         tcpm_set_state(port, TOGGLING, 0);
3928                         break;
3929                 }
3930                 tcpm_set_cc(port, tcpm_rp_cc(port));
3931                 if (port->port_type == TYPEC_PORT_DRP)
3932                         tcpm_set_state(port, SNK_UNATTACHED, PD_T_DRP_SNK);
3933                 break;
3934         case SRC_ATTACH_WAIT:
3935                 if (tcpm_port_is_debug(port))
3936                         tcpm_set_state(port, DEBUG_ACC_ATTACHED,
3937                                        PD_T_CC_DEBOUNCE);
3938                 else if (tcpm_port_is_audio(port))
3939                         tcpm_set_state(port, AUDIO_ACC_ATTACHED,
3940                                        PD_T_CC_DEBOUNCE);
3941                 else if (tcpm_port_is_source(port) && port->vbus_vsafe0v)
3942                         tcpm_set_state(port,
3943                                        tcpm_try_snk(port) ? SNK_TRY
3944                                                           : SRC_ATTACHED,
3945                                        PD_T_CC_DEBOUNCE);
3946                 break;
3947
3948         case SNK_TRY:
3949                 port->try_snk_count++;
3950                 /*
3951                  * Requirements:
3952                  * - Do not drive vconn or vbus
3953                  * - Terminate CC pins (both) to Rd
3954                  * Action:
3955                  * - Wait for tDRPTry (PD_T_DRP_TRY).
3956                  *   Until then, ignore any state changes.
3957                  */
3958                 tcpm_set_cc(port, TYPEC_CC_RD);
3959                 tcpm_set_state(port, SNK_TRY_WAIT, PD_T_DRP_TRY);
3960                 break;
3961         case SNK_TRY_WAIT:
3962                 if (tcpm_port_is_sink(port)) {
3963                         tcpm_set_state(port, SNK_TRY_WAIT_DEBOUNCE, 0);
3964                 } else {
3965                         tcpm_set_state(port, SRC_TRYWAIT, 0);
3966                         port->max_wait = 0;
3967                 }
3968                 break;
3969         case SNK_TRY_WAIT_DEBOUNCE:
3970                 tcpm_set_state(port, SNK_TRY_WAIT_DEBOUNCE_CHECK_VBUS,
3971                                PD_T_TRY_CC_DEBOUNCE);
3972                 break;
3973         case SNK_TRY_WAIT_DEBOUNCE_CHECK_VBUS:
3974                 if (port->vbus_present && tcpm_port_is_sink(port))
3975                         tcpm_set_state(port, SNK_ATTACHED, 0);
3976                 else
3977                         port->max_wait = 0;
3978                 break;
3979         case SRC_TRYWAIT:
3980                 tcpm_set_cc(port, tcpm_rp_cc(port));
3981                 if (port->max_wait == 0) {
3982                         port->max_wait = jiffies +
3983                                          msecs_to_jiffies(PD_T_DRP_TRY);
3984                         tcpm_set_state(port, SRC_TRYWAIT_UNATTACHED,
3985                                        PD_T_DRP_TRY);
3986                 } else {
3987                         if (time_is_after_jiffies(port->max_wait))
3988                                 tcpm_set_state(port, SRC_TRYWAIT_UNATTACHED,
3989                                                jiffies_to_msecs(port->max_wait -
3990                                                                 jiffies));
3991                         else
3992                                 tcpm_set_state(port, SNK_UNATTACHED, 0);
3993                 }
3994                 break;
3995         case SRC_TRYWAIT_DEBOUNCE:
3996                 tcpm_set_state(port, SRC_ATTACHED, PD_T_CC_DEBOUNCE);
3997                 break;
3998         case SRC_TRYWAIT_UNATTACHED:
3999                 tcpm_set_state(port, SNK_UNATTACHED, 0);
4000                 break;
4001
4002         case SRC_ATTACHED:
4003                 ret = tcpm_src_attach(port);
4004                 tcpm_set_state(port, SRC_UNATTACHED,
4005                                ret < 0 ? 0 : PD_T_PS_SOURCE_ON);
4006                 break;
4007         case SRC_STARTUP:
4008                 opmode =  tcpm_get_pwr_opmode(tcpm_rp_cc(port));
4009                 typec_set_pwr_opmode(port->typec_port, opmode);
4010                 port->pwr_opmode = TYPEC_PWR_MODE_USB;
4011                 port->caps_count = 0;
4012                 port->negotiated_rev = PD_MAX_REV;
4013                 port->message_id = 0;
4014                 port->rx_msgid = -1;
4015                 port->explicit_contract = false;
4016                 /* SNK -> SRC POWER/FAST_ROLE_SWAP finished */
4017                 if (port->ams == POWER_ROLE_SWAP ||
4018                     port->ams == FAST_ROLE_SWAP)
4019                         tcpm_ams_finish(port);
4020                 if (!port->pd_supported) {
4021                         tcpm_set_state(port, SRC_READY, 0);
4022                         break;
4023                 }
4024                 port->upcoming_state = SRC_SEND_CAPABILITIES;
4025                 tcpm_ams_start(port, POWER_NEGOTIATION);
4026                 break;
4027         case SRC_SEND_CAPABILITIES:
4028                 port->caps_count++;
4029                 if (port->caps_count > PD_N_CAPS_COUNT) {
4030                         tcpm_set_state(port, SRC_READY, 0);
4031                         break;
4032                 }
4033                 ret = tcpm_pd_send_source_caps(port);
4034                 if (ret < 0) {
4035                         tcpm_set_state(port, SRC_SEND_CAPABILITIES,
4036                                        PD_T_SEND_SOURCE_CAP);
4037                 } else {
4038                         /*
4039                          * Per standard, we should clear the reset counter here.
4040                          * However, that can result in state machine hang-ups.
4041                          * Reset it only in READY state to improve stability.
4042                          */
4043                         /* port->hard_reset_count = 0; */
4044                         port->caps_count = 0;
4045                         port->pd_capable = true;
4046                         tcpm_set_state_cond(port, SRC_SEND_CAPABILITIES_TIMEOUT,
4047                                             PD_T_SEND_SOURCE_CAP);
4048                 }
4049                 break;
4050         case SRC_SEND_CAPABILITIES_TIMEOUT:
4051                 /*
4052                  * Error recovery for a PD_DATA_SOURCE_CAP reply timeout.
4053                  *
4054                  * PD 2.0 sinks are supposed to accept src-capabilities with a
4055                  * 3.0 header and simply ignore any src PDOs which the sink does
4056                  * not understand such as PPS but some 2.0 sinks instead ignore
4057                  * the entire PD_DATA_SOURCE_CAP message, causing contract
4058                  * negotiation to fail.
4059                  *
4060                  * After PD_N_HARD_RESET_COUNT hard-reset attempts, we try
4061                  * sending src-capabilities with a lower PD revision to
4062                  * make these broken sinks work.
4063                  */
4064                 if (port->hard_reset_count < PD_N_HARD_RESET_COUNT) {
4065                         tcpm_set_state(port, HARD_RESET_SEND, 0);
4066                 } else if (port->negotiated_rev > PD_REV20) {
4067                         port->negotiated_rev--;
4068                         port->hard_reset_count = 0;
4069                         tcpm_set_state(port, SRC_SEND_CAPABILITIES, 0);
4070                 } else {
4071                         tcpm_set_state(port, hard_reset_state(port), 0);
4072                 }
4073                 break;
4074         case SRC_NEGOTIATE_CAPABILITIES:
4075                 ret = tcpm_pd_check_request(port);
4076                 if (ret < 0) {
4077                         tcpm_pd_send_control(port, PD_CTRL_REJECT);
4078                         if (!port->explicit_contract) {
4079                                 tcpm_set_state(port,
4080                                                SRC_WAIT_NEW_CAPABILITIES, 0);
4081                         } else {
4082                                 tcpm_set_state(port, SRC_READY, 0);
4083                         }
4084                 } else {
4085                         tcpm_pd_send_control(port, PD_CTRL_ACCEPT);
4086                         tcpm_set_partner_usb_comm_capable(port,
4087                                                           !!(port->sink_request & RDO_USB_COMM));
4088                         tcpm_set_state(port, SRC_TRANSITION_SUPPLY,
4089                                        PD_T_SRC_TRANSITION);
4090                 }
4091                 break;
4092         case SRC_TRANSITION_SUPPLY:
4093                 /* XXX: regulator_set_voltage(vbus, ...) */
4094                 tcpm_pd_send_control(port, PD_CTRL_PS_RDY);
4095                 port->explicit_contract = true;
4096                 typec_set_pwr_opmode(port->typec_port, TYPEC_PWR_MODE_PD);
4097                 port->pwr_opmode = TYPEC_PWR_MODE_PD;
4098                 tcpm_set_state_cond(port, SRC_READY, 0);
4099                 break;
4100         case SRC_READY:
4101 #if 1
4102                 port->hard_reset_count = 0;
4103 #endif
4104                 port->try_src_count = 0;
4105
4106                 tcpm_swap_complete(port, 0);
4107                 tcpm_typec_connect(port);
4108
4109                 if (port->ams != NONE_AMS)
4110                         tcpm_ams_finish(port);
4111                 if (port->next_ams != NONE_AMS) {
4112                         port->ams = port->next_ams;
4113                         port->next_ams = NONE_AMS;
4114                 }
4115
4116                 /*
4117                  * If previous AMS is interrupted, switch to the upcoming
4118                  * state.
4119                  */
4120                 if (port->upcoming_state != INVALID_STATE) {
4121                         upcoming_state = port->upcoming_state;
4122                         port->upcoming_state = INVALID_STATE;
4123                         tcpm_set_state(port, upcoming_state, 0);
4124                         break;
4125                 }
4126
4127                 /*
4128                  * 6.4.4.3.1 Discover Identity
4129                  * "The Discover Identity Command Shall only be sent to SOP when there is an
4130                  * Explicit Contract."
4131                  * For now, this driver only supports SOP for DISCOVER_IDENTITY, thus using
4132                  * port->explicit_contract to decide whether to send the command.
4133                  */
4134                 if (port->explicit_contract) {
4135                         tcpm_set_initial_svdm_version(port);
4136                         mod_send_discover_delayed_work(port, 0);
4137                 } else {
4138                         port->send_discover = false;
4139                 }
4140
4141                 /*
4142                  * 6.3.5
4143                  * Sending ping messages is not necessary if
4144                  * - the source operates at vSafe5V
4145                  * or
4146                  * - The system is not operating in PD mode
4147                  * or
4148                  * - Both partners are connected using a Type-C connector
4149                  *
4150                  * There is no actual need to send PD messages since the local
4151                  * port type-c and the spec does not clearly say whether PD is
4152                  * possible when type-c is connected to Type-A/B
4153                  */
4154                 break;
4155         case SRC_WAIT_NEW_CAPABILITIES:
4156                 /* Nothing to do... */
4157                 break;
4158
4159         /* SNK states */
4160         case SNK_UNATTACHED:
4161                 if (!port->non_pd_role_swap)
4162                         tcpm_swap_complete(port, -ENOTCONN);
4163                 tcpm_pps_complete(port, -ENOTCONN);
4164                 tcpm_snk_detach(port);
4165                 if (port->potential_contaminant) {
4166                         tcpm_set_state(port, CHECK_CONTAMINANT, 0);
4167                         break;
4168                 }
4169                 if (tcpm_start_toggling(port, TYPEC_CC_RD)) {
4170                         tcpm_set_state(port, TOGGLING, 0);
4171                         break;
4172                 }
4173                 tcpm_set_cc(port, TYPEC_CC_RD);
4174                 if (port->port_type == TYPEC_PORT_DRP)
4175                         tcpm_set_state(port, SRC_UNATTACHED, PD_T_DRP_SRC);
4176                 break;
4177         case SNK_ATTACH_WAIT:
4178                 if ((port->cc1 == TYPEC_CC_OPEN &&
4179                      port->cc2 != TYPEC_CC_OPEN) ||
4180                     (port->cc1 != TYPEC_CC_OPEN &&
4181                      port->cc2 == TYPEC_CC_OPEN))
4182                         tcpm_set_state(port, SNK_DEBOUNCED,
4183                                        PD_T_CC_DEBOUNCE);
4184                 else if (tcpm_port_is_disconnected(port))
4185                         tcpm_set_state(port, SNK_UNATTACHED,
4186                                        PD_T_PD_DEBOUNCE);
4187                 break;
4188         case SNK_DEBOUNCED:
4189                 if (tcpm_port_is_disconnected(port))
4190                         tcpm_set_state(port, SNK_UNATTACHED,
4191                                        PD_T_PD_DEBOUNCE);
4192                 else if (port->vbus_present)
4193                         tcpm_set_state(port,
4194                                        tcpm_try_src(port) ? SRC_TRY
4195                                                           : SNK_ATTACHED,
4196                                        0);
4197                 break;
4198         case SRC_TRY:
4199                 port->try_src_count++;
4200                 tcpm_set_cc(port, tcpm_rp_cc(port));
4201                 port->max_wait = 0;
4202                 tcpm_set_state(port, SRC_TRY_WAIT, 0);
4203                 break;
4204         case SRC_TRY_WAIT:
4205                 if (port->max_wait == 0) {
4206                         port->max_wait = jiffies +
4207                                          msecs_to_jiffies(PD_T_DRP_TRY);
4208                         msecs = PD_T_DRP_TRY;
4209                 } else {
4210                         if (time_is_after_jiffies(port->max_wait))
4211                                 msecs = jiffies_to_msecs(port->max_wait -
4212                                                          jiffies);
4213                         else
4214                                 msecs = 0;
4215                 }
4216                 tcpm_set_state(port, SNK_TRYWAIT, msecs);
4217                 break;
4218         case SRC_TRY_DEBOUNCE:
4219                 tcpm_set_state(port, SRC_ATTACHED, PD_T_PD_DEBOUNCE);
4220                 break;
4221         case SNK_TRYWAIT:
4222                 tcpm_set_cc(port, TYPEC_CC_RD);
4223                 tcpm_set_state(port, SNK_TRYWAIT_VBUS, PD_T_CC_DEBOUNCE);
4224                 break;
4225         case SNK_TRYWAIT_VBUS:
4226                 /*
4227                  * TCPM stays in this state indefinitely until VBUS
4228                  * is detected as long as Rp is not detected for
4229                  * more than a time period of tPDDebounce.
4230                  */
4231                 if (port->vbus_present && tcpm_port_is_sink(port)) {
4232                         tcpm_set_state(port, SNK_ATTACHED, 0);
4233                         break;
4234                 }
4235                 if (!tcpm_port_is_sink(port))
4236                         tcpm_set_state(port, SNK_TRYWAIT_DEBOUNCE, 0);
4237                 break;
4238         case SNK_TRYWAIT_DEBOUNCE:
4239                 tcpm_set_state(port, SNK_UNATTACHED, PD_T_PD_DEBOUNCE);
4240                 break;
4241         case SNK_ATTACHED:
4242                 ret = tcpm_snk_attach(port);
4243                 if (ret < 0)
4244                         tcpm_set_state(port, SNK_UNATTACHED, 0);
4245                 else
4246                         tcpm_set_state(port, SNK_STARTUP, 0);
4247                 break;
4248         case SNK_STARTUP:
4249                 opmode =  tcpm_get_pwr_opmode(port->polarity ?
4250                                               port->cc2 : port->cc1);
4251                 typec_set_pwr_opmode(port->typec_port, opmode);
4252                 port->pwr_opmode = TYPEC_PWR_MODE_USB;
4253                 port->negotiated_rev = PD_MAX_REV;
4254                 port->message_id = 0;
4255                 port->rx_msgid = -1;
4256                 port->explicit_contract = false;
4257
4258                 if (port->ams == POWER_ROLE_SWAP ||
4259                     port->ams == FAST_ROLE_SWAP)
4260                         /* SRC -> SNK POWER/FAST_ROLE_SWAP finished */
4261                         tcpm_ams_finish(port);
4262
4263                 tcpm_set_state(port, SNK_DISCOVERY, 0);
4264                 break;
4265         case SNK_DISCOVERY:
4266                 if (port->vbus_present) {
4267                         u32 current_lim = tcpm_get_current_limit(port);
4268
4269                         if (port->slow_charger_loop && (current_lim > PD_P_SNK_STDBY_MW / 5))
4270                                 current_lim = PD_P_SNK_STDBY_MW / 5;
4271                         tcpm_set_current_limit(port, current_lim, 5000);
4272                         /* Not sink vbus if operational current is 0mA */
4273                         tcpm_set_charge(port, !!pdo_max_current(port->snk_pdo[0]));
4274
4275                         if (!port->pd_supported)
4276                                 tcpm_set_state(port, SNK_READY, 0);
4277                         else
4278                                 tcpm_set_state(port, SNK_WAIT_CAPABILITIES, 0);
4279                         break;
4280                 }
4281                 /*
4282                  * For DRP, timeouts differ. Also, handling is supposed to be
4283                  * different and much more complex (dead battery detection;
4284                  * see USB power delivery specification, section 8.3.3.6.1.5.1).
4285                  */
4286                 tcpm_set_state(port, hard_reset_state(port),
4287                                port->port_type == TYPEC_PORT_DRP ?
4288                                         PD_T_DB_DETECT : PD_T_NO_RESPONSE);
4289                 break;
4290         case SNK_DISCOVERY_DEBOUNCE:
4291                 tcpm_set_state(port, SNK_DISCOVERY_DEBOUNCE_DONE,
4292                                PD_T_CC_DEBOUNCE);
4293                 break;
4294         case SNK_DISCOVERY_DEBOUNCE_DONE:
4295                 if (!tcpm_port_is_disconnected(port) &&
4296                     tcpm_port_is_sink(port) &&
4297                     ktime_after(port->delayed_runtime, ktime_get())) {
4298                         tcpm_set_state(port, SNK_DISCOVERY,
4299                                        ktime_to_ms(ktime_sub(port->delayed_runtime, ktime_get())));
4300                         break;
4301                 }
4302                 tcpm_set_state(port, unattached_state(port), 0);
4303                 break;
4304         case SNK_WAIT_CAPABILITIES:
4305                 ret = port->tcpc->set_pd_rx(port->tcpc, true);
4306                 if (ret < 0) {
4307                         tcpm_set_state(port, SNK_READY, 0);
4308                         break;
4309                 }
4310                 /*
4311                  * If VBUS has never been low, and we time out waiting
4312                  * for source cap, try a soft reset first, in case we
4313                  * were already in a stable contract before this boot.
4314                  * Do this only once.
4315                  */
4316                 if (port->vbus_never_low) {
4317                         port->vbus_never_low = false;
4318                         tcpm_set_state(port, SNK_SOFT_RESET,
4319                                        PD_T_SINK_WAIT_CAP);
4320                 } else {
4321                         tcpm_set_state(port, hard_reset_state(port),
4322                                        PD_T_SINK_WAIT_CAP);
4323                 }
4324                 break;
4325         case SNK_NEGOTIATE_CAPABILITIES:
4326                 port->pd_capable = true;
4327                 tcpm_set_partner_usb_comm_capable(port,
4328                                                   !!(port->source_caps[0] & PDO_FIXED_USB_COMM));
4329                 port->hard_reset_count = 0;
4330                 ret = tcpm_pd_send_request(port);
4331                 if (ret < 0) {
4332                         /* Restore back to the original state */
4333                         tcpm_set_auto_vbus_discharge_threshold(port, TYPEC_PWR_MODE_PD,
4334                                                                port->pps_data.active,
4335                                                                port->supply_voltage);
4336                         /* Let the Source send capabilities again. */
4337                         tcpm_set_state(port, SNK_WAIT_CAPABILITIES, 0);
4338                 } else {
4339                         tcpm_set_state_cond(port, hard_reset_state(port),
4340                                             PD_T_SENDER_RESPONSE);
4341                 }
4342                 break;
4343         case SNK_NEGOTIATE_PPS_CAPABILITIES:
4344                 ret = tcpm_pd_send_pps_request(port);
4345                 if (ret < 0) {
4346                         /* Restore back to the original state */
4347                         tcpm_set_auto_vbus_discharge_threshold(port, TYPEC_PWR_MODE_PD,
4348                                                                port->pps_data.active,
4349                                                                port->supply_voltage);
4350                         port->pps_status = ret;
4351                         /*
4352                          * If this was called due to updates to sink
4353                          * capabilities, and pps is no longer valid, we should
4354                          * safely fall back to a standard PDO.
4355                          */
4356                         if (port->update_sink_caps)
4357                                 tcpm_set_state(port, SNK_NEGOTIATE_CAPABILITIES, 0);
4358                         else
4359                                 tcpm_set_state(port, SNK_READY, 0);
4360                 } else {
4361                         tcpm_set_state_cond(port, hard_reset_state(port),
4362                                             PD_T_SENDER_RESPONSE);
4363                 }
4364                 break;
4365         case SNK_TRANSITION_SINK:
4366                 /* From the USB PD spec:
4367                  * "The Sink Shall transition to Sink Standby before a positive or
4368                  * negative voltage transition of VBUS. During Sink Standby
4369                  * the Sink Shall reduce its power draw to pSnkStdby."
4370                  *
4371                  * This is not applicable to PPS though as the port can continue
4372                  * to draw negotiated power without switching to standby.
4373                  */
4374                 if (port->supply_voltage != port->req_supply_voltage && !port->pps_data.active &&
4375                     port->current_limit * port->supply_voltage / 1000 > PD_P_SNK_STDBY_MW) {
4376                         u32 stdby_ma = PD_P_SNK_STDBY_MW * 1000 / port->supply_voltage;
4377
4378                         tcpm_log(port, "Setting standby current %u mV @ %u mA",
4379                                  port->supply_voltage, stdby_ma);
4380                         tcpm_set_current_limit(port, stdby_ma, port->supply_voltage);
4381                 }
4382                 fallthrough;
4383         case SNK_TRANSITION_SINK_VBUS:
4384                 tcpm_set_state(port, hard_reset_state(port),
4385                                PD_T_PS_TRANSITION);
4386                 break;
4387         case SNK_READY:
4388                 port->try_snk_count = 0;
4389                 port->update_sink_caps = false;
4390                 if (port->explicit_contract) {
4391                         typec_set_pwr_opmode(port->typec_port,
4392                                              TYPEC_PWR_MODE_PD);
4393                         port->pwr_opmode = TYPEC_PWR_MODE_PD;
4394                 }
4395
4396                 if (!port->pd_capable && port->slow_charger_loop)
4397                         tcpm_set_current_limit(port, tcpm_get_current_limit(port), 5000);
4398                 tcpm_swap_complete(port, 0);
4399                 tcpm_typec_connect(port);
4400                 mod_enable_frs_delayed_work(port, 0);
4401                 tcpm_pps_complete(port, port->pps_status);
4402
4403                 if (port->ams != NONE_AMS)
4404                         tcpm_ams_finish(port);
4405                 if (port->next_ams != NONE_AMS) {
4406                         port->ams = port->next_ams;
4407                         port->next_ams = NONE_AMS;
4408                 }
4409
4410                 /*
4411                  * If previous AMS is interrupted, switch to the upcoming
4412                  * state.
4413                  */
4414                 if (port->upcoming_state != INVALID_STATE) {
4415                         upcoming_state = port->upcoming_state;
4416                         port->upcoming_state = INVALID_STATE;
4417                         tcpm_set_state(port, upcoming_state, 0);
4418                         break;
4419                 }
4420
4421                 /*
4422                  * 6.4.4.3.1 Discover Identity
4423                  * "The Discover Identity Command Shall only be sent to SOP when there is an
4424                  * Explicit Contract."
4425                  * For now, this driver only supports SOP for DISCOVER_IDENTITY, thus using
4426                  * port->explicit_contract.
4427                  */
4428                 if (port->explicit_contract) {
4429                         tcpm_set_initial_svdm_version(port);
4430                         mod_send_discover_delayed_work(port, 0);
4431                 } else {
4432                         port->send_discover = false;
4433                 }
4434
4435                 power_supply_changed(port->psy);
4436                 break;
4437
4438         /* Accessory states */
4439         case ACC_UNATTACHED:
4440                 tcpm_acc_detach(port);
4441                 tcpm_set_state(port, SRC_UNATTACHED, 0);
4442                 break;
4443         case DEBUG_ACC_ATTACHED:
4444         case AUDIO_ACC_ATTACHED:
4445                 ret = tcpm_acc_attach(port);
4446                 if (ret < 0)
4447                         tcpm_set_state(port, ACC_UNATTACHED, 0);
4448                 break;
4449         case AUDIO_ACC_DEBOUNCE:
4450                 tcpm_set_state(port, ACC_UNATTACHED, PD_T_CC_DEBOUNCE);
4451                 break;
4452
4453         /* Hard_Reset states */
4454         case HARD_RESET_SEND:
4455                 if (port->ams != NONE_AMS)
4456                         tcpm_ams_finish(port);
4457                 /*
4458                  * State machine will be directed to HARD_RESET_START,
4459                  * thus set upcoming_state to INVALID_STATE.
4460                  */
4461                 port->upcoming_state = INVALID_STATE;
4462                 tcpm_ams_start(port, HARD_RESET);
4463                 break;
4464         case HARD_RESET_START:
4465                 port->sink_cap_done = false;
4466                 if (port->tcpc->enable_frs)
4467                         port->tcpc->enable_frs(port->tcpc, false);
4468                 port->hard_reset_count++;
4469                 port->tcpc->set_pd_rx(port->tcpc, false);
4470                 tcpm_unregister_altmodes(port);
4471                 port->nr_sink_caps = 0;
4472                 port->send_discover = true;
4473                 if (port->pwr_role == TYPEC_SOURCE)
4474                         tcpm_set_state(port, SRC_HARD_RESET_VBUS_OFF,
4475                                        PD_T_PS_HARD_RESET);
4476                 else
4477                         tcpm_set_state(port, SNK_HARD_RESET_SINK_OFF, 0);
4478                 break;
4479         case SRC_HARD_RESET_VBUS_OFF:
4480                 /*
4481                  * 7.1.5 Response to Hard Resets
4482                  * Hard Reset Signaling indicates a communication failure has occurred and the
4483                  * Source Shall stop driving VCONN, Shall remove Rp from the VCONN pin and Shall
4484                  * drive VBUS to vSafe0V as shown in Figure 7-9.
4485                  */
4486                 tcpm_set_vconn(port, false);
4487                 tcpm_set_vbus(port, false);
4488                 tcpm_set_roles(port, port->self_powered, TYPEC_SOURCE,
4489                                tcpm_data_role_for_source(port));
4490                 /*
4491                  * If tcpc fails to notify vbus off, TCPM will wait for PD_T_SAFE_0V +
4492                  * PD_T_SRC_RECOVER before turning vbus back on.
4493                  * From Table 7-12 Sequence Description for a Source Initiated Hard Reset:
4494                  * 4. Policy Engine waits tPSHardReset after sending Hard Reset Signaling and then
4495                  * tells the Device Policy Manager to instruct the power supply to perform a
4496                  * Hard Reset. The transition to vSafe0V Shall occur within tSafe0V (t2).
4497                  * 5. After tSrcRecover the Source applies power to VBUS in an attempt to
4498                  * re-establish communication with the Sink and resume USB Default Operation.
4499                  * The transition to vSafe5V Shall occur within tSrcTurnOn(t4).
4500                  */
4501                 tcpm_set_state(port, SRC_HARD_RESET_VBUS_ON, PD_T_SAFE_0V + PD_T_SRC_RECOVER);
4502                 break;
4503         case SRC_HARD_RESET_VBUS_ON:
4504                 tcpm_set_vconn(port, true);
4505                 tcpm_set_vbus(port, true);
4506                 if (port->ams == HARD_RESET)
4507                         tcpm_ams_finish(port);
4508                 if (port->pd_supported)
4509                         port->tcpc->set_pd_rx(port->tcpc, true);
4510                 tcpm_set_attached_state(port, true);
4511                 tcpm_set_state(port, SRC_UNATTACHED, PD_T_PS_SOURCE_ON);
4512                 break;
4513         case SNK_HARD_RESET_SINK_OFF:
4514                 /* Do not discharge/disconnect during hard reseet */
4515                 tcpm_set_auto_vbus_discharge_threshold(port, TYPEC_PWR_MODE_USB, false, 0);
4516                 memset(&port->pps_data, 0, sizeof(port->pps_data));
4517                 tcpm_set_vconn(port, false);
4518                 if (port->pd_capable)
4519                         tcpm_set_charge(port, false);
4520                 tcpm_set_roles(port, port->self_powered, TYPEC_SINK,
4521                                tcpm_data_role_for_sink(port));
4522                 /*
4523                  * VBUS may or may not toggle, depending on the adapter.
4524                  * If it doesn't toggle, transition to SNK_HARD_RESET_SINK_ON
4525                  * directly after timeout.
4526                  */
4527                 tcpm_set_state(port, SNK_HARD_RESET_SINK_ON, PD_T_SAFE_0V);
4528                 break;
4529         case SNK_HARD_RESET_WAIT_VBUS:
4530                 if (port->ams == HARD_RESET)
4531                         tcpm_ams_finish(port);
4532                 /* Assume we're disconnected if VBUS doesn't come back. */
4533                 tcpm_set_state(port, SNK_UNATTACHED,
4534                                PD_T_SRC_RECOVER_MAX + PD_T_SRC_TURN_ON);
4535                 break;
4536         case SNK_HARD_RESET_SINK_ON:
4537                 /* Note: There is no guarantee that VBUS is on in this state */
4538                 /*
4539                  * XXX:
4540                  * The specification suggests that dual mode ports in sink
4541                  * mode should transition to state PE_SRC_Transition_to_default.
4542                  * See USB power delivery specification chapter 8.3.3.6.1.3.
4543                  * This would mean to
4544                  * - turn off VCONN, reset power supply
4545                  * - request hardware reset
4546                  * - turn on VCONN
4547                  * - Transition to state PE_Src_Startup
4548                  * SNK only ports shall transition to state Snk_Startup
4549                  * (see chapter 8.3.3.3.8).
4550                  * Similar, dual-mode ports in source mode should transition
4551                  * to PE_SNK_Transition_to_default.
4552                  */
4553                 if (port->pd_capable) {
4554                         tcpm_set_current_limit(port,
4555                                                tcpm_get_current_limit(port),
4556                                                5000);
4557                         /* Not sink vbus if operational current is 0mA */
4558                         tcpm_set_charge(port, !!pdo_max_current(port->snk_pdo[0]));
4559                 }
4560                 if (port->ams == HARD_RESET)
4561                         tcpm_ams_finish(port);
4562                 tcpm_set_attached_state(port, true);
4563                 tcpm_set_auto_vbus_discharge_threshold(port, TYPEC_PWR_MODE_USB, false, VSAFE5V);
4564                 tcpm_set_state(port, SNK_STARTUP, 0);
4565                 break;
4566
4567         /* Soft_Reset states */
4568         case SOFT_RESET:
4569                 port->message_id = 0;
4570                 port->rx_msgid = -1;
4571                 /* remove existing capabilities */
4572                 usb_power_delivery_unregister_capabilities(port->partner_source_caps);
4573                 port->partner_source_caps = NULL;
4574                 tcpm_pd_send_control(port, PD_CTRL_ACCEPT);
4575                 tcpm_ams_finish(port);
4576                 if (port->pwr_role == TYPEC_SOURCE) {
4577                         port->upcoming_state = SRC_SEND_CAPABILITIES;
4578                         tcpm_ams_start(port, POWER_NEGOTIATION);
4579                 } else {
4580                         tcpm_set_state(port, SNK_WAIT_CAPABILITIES, 0);
4581                 }
4582                 break;
4583         case SRC_SOFT_RESET_WAIT_SNK_TX:
4584         case SNK_SOFT_RESET:
4585                 if (port->ams != NONE_AMS)
4586                         tcpm_ams_finish(port);
4587                 port->upcoming_state = SOFT_RESET_SEND;
4588                 tcpm_ams_start(port, SOFT_RESET_AMS);
4589                 break;
4590         case SOFT_RESET_SEND:
4591                 port->message_id = 0;
4592                 port->rx_msgid = -1;
4593                 /* remove existing capabilities */
4594                 usb_power_delivery_unregister_capabilities(port->partner_source_caps);
4595                 port->partner_source_caps = NULL;
4596                 if (tcpm_pd_send_control(port, PD_CTRL_SOFT_RESET))
4597                         tcpm_set_state_cond(port, hard_reset_state(port), 0);
4598                 else
4599                         tcpm_set_state_cond(port, hard_reset_state(port),
4600                                             PD_T_SENDER_RESPONSE);
4601                 break;
4602
4603         /* DR_Swap states */
4604         case DR_SWAP_SEND:
4605                 tcpm_pd_send_control(port, PD_CTRL_DR_SWAP);
4606                 if (port->data_role == TYPEC_DEVICE || port->negotiated_rev > PD_REV20)
4607                         port->send_discover = true;
4608                 tcpm_set_state_cond(port, DR_SWAP_SEND_TIMEOUT,
4609                                     PD_T_SENDER_RESPONSE);
4610                 break;
4611         case DR_SWAP_ACCEPT:
4612                 tcpm_pd_send_control(port, PD_CTRL_ACCEPT);
4613                 if (port->data_role == TYPEC_DEVICE || port->negotiated_rev > PD_REV20)
4614                         port->send_discover = true;
4615                 tcpm_set_state_cond(port, DR_SWAP_CHANGE_DR, 0);
4616                 break;
4617         case DR_SWAP_SEND_TIMEOUT:
4618                 tcpm_swap_complete(port, -ETIMEDOUT);
4619                 port->send_discover = false;
4620                 tcpm_ams_finish(port);
4621                 tcpm_set_state(port, ready_state(port), 0);
4622                 break;
4623         case DR_SWAP_CHANGE_DR:
4624                 tcpm_unregister_altmodes(port);
4625                 if (port->data_role == TYPEC_HOST)
4626                         tcpm_set_roles(port, true, port->pwr_role,
4627                                        TYPEC_DEVICE);
4628                 else
4629                         tcpm_set_roles(port, true, port->pwr_role,
4630                                        TYPEC_HOST);
4631                 tcpm_ams_finish(port);
4632                 tcpm_set_state(port, ready_state(port), 0);
4633                 break;
4634
4635         case FR_SWAP_SEND:
4636                 if (tcpm_pd_send_control(port, PD_CTRL_FR_SWAP)) {
4637                         tcpm_set_state(port, ERROR_RECOVERY, 0);
4638                         break;
4639                 }
4640                 tcpm_set_state_cond(port, FR_SWAP_SEND_TIMEOUT, PD_T_SENDER_RESPONSE);
4641                 break;
4642         case FR_SWAP_SEND_TIMEOUT:
4643                 tcpm_set_state(port, ERROR_RECOVERY, 0);
4644                 break;
4645         case FR_SWAP_SNK_SRC_TRANSITION_TO_OFF:
4646                 tcpm_set_state(port, ERROR_RECOVERY, PD_T_PS_SOURCE_OFF);
4647                 break;
4648         case FR_SWAP_SNK_SRC_NEW_SINK_READY:
4649                 if (port->vbus_source)
4650                         tcpm_set_state(port, FR_SWAP_SNK_SRC_SOURCE_VBUS_APPLIED, 0);
4651                 else
4652                         tcpm_set_state(port, ERROR_RECOVERY, PD_T_RECEIVER_RESPONSE);
4653                 break;
4654         case FR_SWAP_SNK_SRC_SOURCE_VBUS_APPLIED:
4655                 tcpm_set_pwr_role(port, TYPEC_SOURCE);
4656                 if (tcpm_pd_send_control(port, PD_CTRL_PS_RDY)) {
4657                         tcpm_set_state(port, ERROR_RECOVERY, 0);
4658                         break;
4659                 }
4660                 tcpm_set_cc(port, tcpm_rp_cc(port));
4661                 tcpm_set_state(port, SRC_STARTUP, PD_T_SWAP_SRC_START);
4662                 break;
4663
4664         /* PR_Swap states */
4665         case PR_SWAP_ACCEPT:
4666                 tcpm_pd_send_control(port, PD_CTRL_ACCEPT);
4667                 tcpm_set_state(port, PR_SWAP_START, 0);
4668                 break;
4669         case PR_SWAP_SEND:
4670                 tcpm_pd_send_control(port, PD_CTRL_PR_SWAP);
4671                 tcpm_set_state_cond(port, PR_SWAP_SEND_TIMEOUT,
4672                                     PD_T_SENDER_RESPONSE);
4673                 break;
4674         case PR_SWAP_SEND_TIMEOUT:
4675                 tcpm_swap_complete(port, -ETIMEDOUT);
4676                 tcpm_set_state(port, ready_state(port), 0);
4677                 break;
4678         case PR_SWAP_START:
4679                 tcpm_apply_rc(port);
4680                 if (port->pwr_role == TYPEC_SOURCE)
4681                         tcpm_set_state(port, PR_SWAP_SRC_SNK_TRANSITION_OFF,
4682                                        PD_T_SRC_TRANSITION);
4683                 else
4684                         tcpm_set_state(port, PR_SWAP_SNK_SRC_SINK_OFF, 0);
4685                 break;
4686         case PR_SWAP_SRC_SNK_TRANSITION_OFF:
4687                 /*
4688                  * Prevent vbus discharge circuit from turning on during PR_SWAP
4689                  * as this is not a disconnect.
4690                  */
4691                 tcpm_set_vbus(port, false);
4692                 port->explicit_contract = false;
4693                 /* allow time for Vbus discharge, must be < tSrcSwapStdby */
4694                 tcpm_set_state(port, PR_SWAP_SRC_SNK_SOURCE_OFF,
4695                                PD_T_SRCSWAPSTDBY);
4696                 break;
4697         case PR_SWAP_SRC_SNK_SOURCE_OFF:
4698                 tcpm_set_cc(port, TYPEC_CC_RD);
4699                 /* allow CC debounce */
4700                 tcpm_set_state(port, PR_SWAP_SRC_SNK_SOURCE_OFF_CC_DEBOUNCED,
4701                                PD_T_CC_DEBOUNCE);
4702                 break;
4703         case PR_SWAP_SRC_SNK_SOURCE_OFF_CC_DEBOUNCED:
4704                 /*
4705                  * USB-PD standard, 6.2.1.4, Port Power Role:
4706                  * "During the Power Role Swap Sequence, for the initial Source
4707                  * Port, the Port Power Role field shall be set to Sink in the
4708                  * PS_RDY Message indicating that the initial Source’s power
4709                  * supply is turned off"
4710                  */
4711                 tcpm_set_pwr_role(port, TYPEC_SINK);
4712                 if (tcpm_pd_send_control(port, PD_CTRL_PS_RDY)) {
4713                         tcpm_set_state(port, ERROR_RECOVERY, 0);
4714                         break;
4715                 }
4716                 tcpm_set_state(port, ERROR_RECOVERY, PD_T_PS_SOURCE_ON_PRS);
4717                 break;
4718         case PR_SWAP_SRC_SNK_SINK_ON:
4719                 tcpm_enable_auto_vbus_discharge(port, true);
4720                 /* Set the vbus disconnect threshold for implicit contract */
4721                 tcpm_set_auto_vbus_discharge_threshold(port, TYPEC_PWR_MODE_USB, false, VSAFE5V);
4722                 tcpm_set_state(port, SNK_STARTUP, 0);
4723                 break;
4724         case PR_SWAP_SNK_SRC_SINK_OFF:
4725                 /* will be source, remove existing capabilities */
4726                 usb_power_delivery_unregister_capabilities(port->partner_source_caps);
4727                 port->partner_source_caps = NULL;
4728                 /*
4729                  * Prevent vbus discharge circuit from turning on during PR_SWAP
4730                  * as this is not a disconnect.
4731                  */
4732                 tcpm_set_auto_vbus_discharge_threshold(port, TYPEC_PWR_MODE_USB,
4733                                                        port->pps_data.active, 0);
4734                 tcpm_set_charge(port, false);
4735                 tcpm_set_state(port, hard_reset_state(port),
4736                                PD_T_PS_SOURCE_OFF);
4737                 break;
4738         case PR_SWAP_SNK_SRC_SOURCE_ON:
4739                 tcpm_enable_auto_vbus_discharge(port, true);
4740                 tcpm_set_cc(port, tcpm_rp_cc(port));
4741                 tcpm_set_vbus(port, true);
4742                 /*
4743                  * allow time VBUS ramp-up, must be < tNewSrc
4744                  * Also, this window overlaps with CC debounce as well.
4745                  * So, Wait for the max of two which is PD_T_NEWSRC
4746                  */
4747                 tcpm_set_state(port, PR_SWAP_SNK_SRC_SOURCE_ON_VBUS_RAMPED_UP,
4748                                PD_T_NEWSRC);
4749                 break;
4750         case PR_SWAP_SNK_SRC_SOURCE_ON_VBUS_RAMPED_UP:
4751                 /*
4752                  * USB PD standard, 6.2.1.4:
4753                  * "Subsequent Messages initiated by the Policy Engine,
4754                  * such as the PS_RDY Message sent to indicate that Vbus
4755                  * is ready, will have the Port Power Role field set to
4756                  * Source."
4757                  */
4758                 tcpm_set_pwr_role(port, TYPEC_SOURCE);
4759                 tcpm_pd_send_control(port, PD_CTRL_PS_RDY);
4760                 tcpm_set_state(port, SRC_STARTUP, PD_T_SWAP_SRC_START);
4761                 break;
4762
4763         case VCONN_SWAP_ACCEPT:
4764                 tcpm_pd_send_control(port, PD_CTRL_ACCEPT);
4765                 tcpm_ams_finish(port);
4766                 tcpm_set_state(port, VCONN_SWAP_START, 0);
4767                 break;
4768         case VCONN_SWAP_SEND:
4769                 tcpm_pd_send_control(port, PD_CTRL_VCONN_SWAP);
4770                 tcpm_set_state(port, VCONN_SWAP_SEND_TIMEOUT,
4771                                PD_T_SENDER_RESPONSE);
4772                 break;
4773         case VCONN_SWAP_SEND_TIMEOUT:
4774                 tcpm_swap_complete(port, -ETIMEDOUT);
4775                 tcpm_set_state(port, ready_state(port), 0);
4776                 break;
4777         case VCONN_SWAP_START:
4778                 if (port->vconn_role == TYPEC_SOURCE)
4779                         tcpm_set_state(port, VCONN_SWAP_WAIT_FOR_VCONN, 0);
4780                 else
4781                         tcpm_set_state(port, VCONN_SWAP_TURN_ON_VCONN, 0);
4782                 break;
4783         case VCONN_SWAP_WAIT_FOR_VCONN:
4784                 tcpm_set_state(port, hard_reset_state(port),
4785                                PD_T_VCONN_SOURCE_ON);
4786                 break;
4787         case VCONN_SWAP_TURN_ON_VCONN:
4788                 tcpm_set_vconn(port, true);
4789                 tcpm_pd_send_control(port, PD_CTRL_PS_RDY);
4790                 tcpm_set_state(port, ready_state(port), 0);
4791                 break;
4792         case VCONN_SWAP_TURN_OFF_VCONN:
4793                 tcpm_set_vconn(port, false);
4794                 tcpm_set_state(port, ready_state(port), 0);
4795                 break;
4796
4797         case DR_SWAP_CANCEL:
4798         case PR_SWAP_CANCEL:
4799         case VCONN_SWAP_CANCEL:
4800                 tcpm_swap_complete(port, port->swap_status);
4801                 if (port->pwr_role == TYPEC_SOURCE)
4802                         tcpm_set_state(port, SRC_READY, 0);
4803                 else
4804                         tcpm_set_state(port, SNK_READY, 0);
4805                 break;
4806         case FR_SWAP_CANCEL:
4807                 if (port->pwr_role == TYPEC_SOURCE)
4808                         tcpm_set_state(port, SRC_READY, 0);
4809                 else
4810                         tcpm_set_state(port, SNK_READY, 0);
4811                 break;
4812
4813         case BIST_RX:
4814                 switch (BDO_MODE_MASK(port->bist_request)) {
4815                 case BDO_MODE_CARRIER2:
4816                         tcpm_pd_transmit(port, TCPC_TX_BIST_MODE_2, NULL);
4817                         tcpm_set_state(port, unattached_state(port),
4818                                        PD_T_BIST_CONT_MODE);
4819                         break;
4820                 case BDO_MODE_TESTDATA:
4821                         if (port->tcpc->set_bist_data) {
4822                                 tcpm_log(port, "Enable BIST MODE TESTDATA");
4823                                 port->tcpc->set_bist_data(port->tcpc, true);
4824                         }
4825                         break;
4826                 default:
4827                         break;
4828                 }
4829                 break;
4830         case GET_STATUS_SEND:
4831                 tcpm_pd_send_control(port, PD_CTRL_GET_STATUS);
4832                 tcpm_set_state(port, GET_STATUS_SEND_TIMEOUT,
4833                                PD_T_SENDER_RESPONSE);
4834                 break;
4835         case GET_STATUS_SEND_TIMEOUT:
4836                 tcpm_set_state(port, ready_state(port), 0);
4837                 break;
4838         case GET_PPS_STATUS_SEND:
4839                 tcpm_pd_send_control(port, PD_CTRL_GET_PPS_STATUS);
4840                 tcpm_set_state(port, GET_PPS_STATUS_SEND_TIMEOUT,
4841                                PD_T_SENDER_RESPONSE);
4842                 break;
4843         case GET_PPS_STATUS_SEND_TIMEOUT:
4844                 tcpm_set_state(port, ready_state(port), 0);
4845                 break;
4846         case GET_SINK_CAP:
4847                 tcpm_pd_send_control(port, PD_CTRL_GET_SINK_CAP);
4848                 tcpm_set_state(port, GET_SINK_CAP_TIMEOUT, PD_T_SENDER_RESPONSE);
4849                 break;
4850         case GET_SINK_CAP_TIMEOUT:
4851                 port->sink_cap_done = true;
4852                 tcpm_set_state(port, ready_state(port), 0);
4853                 break;
4854         case ERROR_RECOVERY:
4855                 tcpm_swap_complete(port, -EPROTO);
4856                 tcpm_pps_complete(port, -EPROTO);
4857                 tcpm_set_state(port, PORT_RESET, 0);
4858                 break;
4859         case PORT_RESET:
4860                 tcpm_reset_port(port);
4861                 tcpm_set_cc(port, tcpm_default_state(port) == SNK_UNATTACHED ?
4862                             TYPEC_CC_RD : tcpm_rp_cc(port));
4863                 tcpm_set_state(port, PORT_RESET_WAIT_OFF,
4864                                PD_T_ERROR_RECOVERY);
4865                 break;
4866         case PORT_RESET_WAIT_OFF:
4867                 tcpm_set_state(port,
4868                                tcpm_default_state(port),
4869                                port->vbus_present ? PD_T_PS_SOURCE_OFF : 0);
4870                 break;
4871
4872         /* AMS intermediate state */
4873         case AMS_START:
4874                 if (port->upcoming_state == INVALID_STATE) {
4875                         tcpm_set_state(port, port->pwr_role == TYPEC_SOURCE ?
4876                                        SRC_READY : SNK_READY, 0);
4877                         break;
4878                 }
4879
4880                 upcoming_state = port->upcoming_state;
4881                 port->upcoming_state = INVALID_STATE;
4882                 tcpm_set_state(port, upcoming_state, 0);
4883                 break;
4884
4885         /* Chunk state */
4886         case CHUNK_NOT_SUPP:
4887                 tcpm_pd_send_control(port, PD_CTRL_NOT_SUPP);
4888                 tcpm_set_state(port, port->pwr_role == TYPEC_SOURCE ? SRC_READY : SNK_READY, 0);
4889                 break;
4890         default:
4891                 WARN(1, "Unexpected port state %d\n", port->state);
4892                 break;
4893         }
4894 }
4895
4896 static void tcpm_state_machine_work(struct kthread_work *work)
4897 {
4898         struct tcpm_port *port = container_of(work, struct tcpm_port, state_machine);
4899         enum tcpm_state prev_state;
4900
4901         mutex_lock(&port->lock);
4902         port->state_machine_running = true;
4903
4904         if (port->queued_message && tcpm_send_queued_message(port))
4905                 goto done;
4906
4907         /* If we were queued due to a delayed state change, update it now */
4908         if (port->delayed_state) {
4909                 tcpm_log(port, "state change %s -> %s [delayed %ld ms]",
4910                          tcpm_states[port->state],
4911                          tcpm_states[port->delayed_state], port->delay_ms);
4912                 port->prev_state = port->state;
4913                 port->state = port->delayed_state;
4914                 port->delayed_state = INVALID_STATE;
4915         }
4916
4917         /*
4918          * Continue running as long as we have (non-delayed) state changes
4919          * to make.
4920          */
4921         do {
4922                 prev_state = port->state;
4923                 run_state_machine(port);
4924                 if (port->queued_message)
4925                         tcpm_send_queued_message(port);
4926         } while (port->state != prev_state && !port->delayed_state);
4927
4928 done:
4929         port->state_machine_running = false;
4930         mutex_unlock(&port->lock);
4931 }
4932
4933 static void _tcpm_cc_change(struct tcpm_port *port, enum typec_cc_status cc1,
4934                             enum typec_cc_status cc2)
4935 {
4936         enum typec_cc_status old_cc1, old_cc2;
4937         enum tcpm_state new_state;
4938
4939         old_cc1 = port->cc1;
4940         old_cc2 = port->cc2;
4941         port->cc1 = cc1;
4942         port->cc2 = cc2;
4943
4944         tcpm_log_force(port,
4945                        "CC1: %u -> %u, CC2: %u -> %u [state %s, polarity %d, %s]",
4946                        old_cc1, cc1, old_cc2, cc2, tcpm_states[port->state],
4947                        port->polarity,
4948                        tcpm_port_is_disconnected(port) ? "disconnected"
4949                                                        : "connected");
4950
4951         switch (port->state) {
4952         case TOGGLING:
4953                 if (tcpm_port_is_debug(port) || tcpm_port_is_audio(port) ||
4954                     tcpm_port_is_source(port))
4955                         tcpm_set_state(port, SRC_ATTACH_WAIT, 0);
4956                 else if (tcpm_port_is_sink(port))
4957                         tcpm_set_state(port, SNK_ATTACH_WAIT, 0);
4958                 break;
4959         case CHECK_CONTAMINANT:
4960                 /* Wait for Toggling to be resumed */
4961                 break;
4962         case SRC_UNATTACHED:
4963         case ACC_UNATTACHED:
4964                 if (tcpm_port_is_debug(port) || tcpm_port_is_audio(port) ||
4965                     tcpm_port_is_source(port))
4966                         tcpm_set_state(port, SRC_ATTACH_WAIT, 0);
4967                 break;
4968         case SRC_ATTACH_WAIT:
4969                 if (tcpm_port_is_disconnected(port) ||
4970                     tcpm_port_is_audio_detached(port))
4971                         tcpm_set_state(port, SRC_UNATTACHED, 0);
4972                 else if (cc1 != old_cc1 || cc2 != old_cc2)
4973                         tcpm_set_state(port, SRC_ATTACH_WAIT, 0);
4974                 break;
4975         case SRC_ATTACHED:
4976         case SRC_STARTUP:
4977         case SRC_SEND_CAPABILITIES:
4978         case SRC_READY:
4979                 if (tcpm_port_is_disconnected(port) ||
4980                     !tcpm_port_is_source(port)) {
4981                         if (port->port_type == TYPEC_PORT_SRC)
4982                                 tcpm_set_state(port, SRC_UNATTACHED, tcpm_wait_for_discharge(port));
4983                         else
4984                                 tcpm_set_state(port, SNK_UNATTACHED, tcpm_wait_for_discharge(port));
4985                 }
4986                 break;
4987         case SNK_UNATTACHED:
4988                 if (tcpm_port_is_sink(port))
4989                         tcpm_set_state(port, SNK_ATTACH_WAIT, 0);
4990                 break;
4991         case SNK_ATTACH_WAIT:
4992                 if ((port->cc1 == TYPEC_CC_OPEN &&
4993                      port->cc2 != TYPEC_CC_OPEN) ||
4994                     (port->cc1 != TYPEC_CC_OPEN &&
4995                      port->cc2 == TYPEC_CC_OPEN))
4996                         new_state = SNK_DEBOUNCED;
4997                 else if (tcpm_port_is_disconnected(port))
4998                         new_state = SNK_UNATTACHED;
4999                 else
5000                         break;
5001                 if (new_state != port->delayed_state)
5002                         tcpm_set_state(port, SNK_ATTACH_WAIT, 0);
5003                 break;
5004         case SNK_DEBOUNCED:
5005                 if (tcpm_port_is_disconnected(port))
5006                         new_state = SNK_UNATTACHED;
5007                 else if (port->vbus_present)
5008                         new_state = tcpm_try_src(port) ? SRC_TRY : SNK_ATTACHED;
5009                 else
5010                         new_state = SNK_UNATTACHED;
5011                 if (new_state != port->delayed_state)
5012                         tcpm_set_state(port, SNK_DEBOUNCED, 0);
5013                 break;
5014         case SNK_READY:
5015                 /*
5016                  * EXIT condition is based primarily on vbus disconnect and CC is secondary.
5017                  * "A port that has entered into USB PD communications with the Source and
5018                  * has seen the CC voltage exceed vRd-USB may monitor the CC pin to detect
5019                  * cable disconnect in addition to monitoring VBUS.
5020                  *
5021                  * A port that is monitoring the CC voltage for disconnect (but is not in
5022                  * the process of a USB PD PR_Swap or USB PD FR_Swap) shall transition to
5023                  * Unattached.SNK within tSinkDisconnect after the CC voltage remains below
5024                  * vRd-USB for tPDDebounce."
5025                  *
5026                  * When set_auto_vbus_discharge_threshold is enabled, CC pins go
5027                  * away before vbus decays to disconnect threshold. Allow
5028                  * disconnect to be driven by vbus disconnect when auto vbus
5029                  * discharge is enabled.
5030                  */
5031                 if (!port->auto_vbus_discharge_enabled && tcpm_port_is_disconnected(port))
5032                         tcpm_set_state(port, unattached_state(port), 0);
5033                 else if (!port->pd_capable &&
5034                          (cc1 != old_cc1 || cc2 != old_cc2))
5035                         tcpm_set_current_limit(port,
5036                                                tcpm_get_current_limit(port),
5037                                                5000);
5038                 break;
5039
5040         case AUDIO_ACC_ATTACHED:
5041                 if (cc1 == TYPEC_CC_OPEN || cc2 == TYPEC_CC_OPEN)
5042                         tcpm_set_state(port, AUDIO_ACC_DEBOUNCE, 0);
5043                 break;
5044         case AUDIO_ACC_DEBOUNCE:
5045                 if (tcpm_port_is_audio(port))
5046                         tcpm_set_state(port, AUDIO_ACC_ATTACHED, 0);
5047                 break;
5048
5049         case DEBUG_ACC_ATTACHED:
5050                 if (cc1 == TYPEC_CC_OPEN || cc2 == TYPEC_CC_OPEN)
5051                         tcpm_set_state(port, ACC_UNATTACHED, 0);
5052                 break;
5053
5054         case SNK_TRY:
5055                 /* Do nothing, waiting for timeout */
5056                 break;
5057
5058         case SNK_DISCOVERY:
5059                 /* CC line is unstable, wait for debounce */
5060                 if (tcpm_port_is_disconnected(port))
5061                         tcpm_set_state(port, SNK_DISCOVERY_DEBOUNCE, 0);
5062                 break;
5063         case SNK_DISCOVERY_DEBOUNCE:
5064                 break;
5065
5066         case SRC_TRYWAIT:
5067                 /* Hand over to state machine if needed */
5068                 if (!port->vbus_present && tcpm_port_is_source(port))
5069                         tcpm_set_state(port, SRC_TRYWAIT_DEBOUNCE, 0);
5070                 break;
5071         case SRC_TRYWAIT_DEBOUNCE:
5072                 if (port->vbus_present || !tcpm_port_is_source(port))
5073                         tcpm_set_state(port, SRC_TRYWAIT, 0);
5074                 break;
5075         case SNK_TRY_WAIT_DEBOUNCE:
5076                 if (!tcpm_port_is_sink(port)) {
5077                         port->max_wait = 0;
5078                         tcpm_set_state(port, SRC_TRYWAIT, 0);
5079                 }
5080                 break;
5081         case SRC_TRY_WAIT:
5082                 if (tcpm_port_is_source(port))
5083                         tcpm_set_state(port, SRC_TRY_DEBOUNCE, 0);
5084                 break;
5085         case SRC_TRY_DEBOUNCE:
5086                 tcpm_set_state(port, SRC_TRY_WAIT, 0);
5087                 break;
5088         case SNK_TRYWAIT_DEBOUNCE:
5089                 if (tcpm_port_is_sink(port))
5090                         tcpm_set_state(port, SNK_TRYWAIT_VBUS, 0);
5091                 break;
5092         case SNK_TRYWAIT_VBUS:
5093                 if (!tcpm_port_is_sink(port))
5094                         tcpm_set_state(port, SNK_TRYWAIT_DEBOUNCE, 0);
5095                 break;
5096         case SNK_TRY_WAIT_DEBOUNCE_CHECK_VBUS:
5097                 if (!tcpm_port_is_sink(port))
5098                         tcpm_set_state(port, SRC_TRYWAIT, PD_T_TRY_CC_DEBOUNCE);
5099                 else
5100                         tcpm_set_state(port, SNK_TRY_WAIT_DEBOUNCE_CHECK_VBUS, 0);
5101                 break;
5102         case SNK_TRYWAIT:
5103                 /* Do nothing, waiting for tCCDebounce */
5104                 break;
5105         case PR_SWAP_SNK_SRC_SINK_OFF:
5106         case PR_SWAP_SRC_SNK_TRANSITION_OFF:
5107         case PR_SWAP_SRC_SNK_SOURCE_OFF:
5108         case PR_SWAP_SRC_SNK_SOURCE_OFF_CC_DEBOUNCED:
5109         case PR_SWAP_SNK_SRC_SOURCE_ON:
5110                 /*
5111                  * CC state change is expected in PR_SWAP
5112                  * Ignore it.
5113                  */
5114                 break;
5115         case FR_SWAP_SEND:
5116         case FR_SWAP_SEND_TIMEOUT:
5117         case FR_SWAP_SNK_SRC_TRANSITION_TO_OFF:
5118         case FR_SWAP_SNK_SRC_NEW_SINK_READY:
5119         case FR_SWAP_SNK_SRC_SOURCE_VBUS_APPLIED:
5120                 /* Do nothing, CC change expected */
5121                 break;
5122
5123         case PORT_RESET:
5124         case PORT_RESET_WAIT_OFF:
5125                 /*
5126                  * State set back to default mode once the timer completes.
5127                  * Ignore CC changes here.
5128                  */
5129                 break;
5130         default:
5131                 /*
5132                  * While acting as sink and auto vbus discharge is enabled, Allow disconnect
5133                  * to be driven by vbus disconnect.
5134                  */
5135                 if (tcpm_port_is_disconnected(port) && !(port->pwr_role == TYPEC_SINK &&
5136                                                          port->auto_vbus_discharge_enabled))
5137                         tcpm_set_state(port, unattached_state(port), 0);
5138                 break;
5139         }
5140 }
5141
5142 static void _tcpm_pd_vbus_on(struct tcpm_port *port)
5143 {
5144         tcpm_log_force(port, "VBUS on");
5145         port->vbus_present = true;
5146         /*
5147          * When vbus_present is true i.e. Voltage at VBUS is greater than VSAFE5V implicitly
5148          * states that vbus is not at VSAFE0V, hence clear the vbus_vsafe0v flag here.
5149          */
5150         port->vbus_vsafe0v = false;
5151
5152         switch (port->state) {
5153         case SNK_TRANSITION_SINK_VBUS:
5154                 port->explicit_contract = true;
5155                 tcpm_set_state(port, SNK_READY, 0);
5156                 break;
5157         case SNK_DISCOVERY:
5158                 tcpm_set_state(port, SNK_DISCOVERY, 0);
5159                 break;
5160
5161         case SNK_DEBOUNCED:
5162                 tcpm_set_state(port, tcpm_try_src(port) ? SRC_TRY
5163                                                         : SNK_ATTACHED,
5164                                        0);
5165                 break;
5166         case SNK_HARD_RESET_WAIT_VBUS:
5167                 tcpm_set_state(port, SNK_HARD_RESET_SINK_ON, 0);
5168                 break;
5169         case SRC_ATTACHED:
5170                 tcpm_set_state(port, SRC_STARTUP, 0);
5171                 break;
5172         case SRC_HARD_RESET_VBUS_ON:
5173                 tcpm_set_state(port, SRC_STARTUP, 0);
5174                 break;
5175
5176         case SNK_TRY:
5177                 /* Do nothing, waiting for timeout */
5178                 break;
5179         case SRC_TRYWAIT:
5180                 /* Do nothing, Waiting for Rd to be detected */
5181                 break;
5182         case SRC_TRYWAIT_DEBOUNCE:
5183                 tcpm_set_state(port, SRC_TRYWAIT, 0);
5184                 break;
5185         case SNK_TRY_WAIT_DEBOUNCE:
5186                 /* Do nothing, waiting for PD_DEBOUNCE to do be done */
5187                 break;
5188         case SNK_TRYWAIT:
5189                 /* Do nothing, waiting for tCCDebounce */
5190                 break;
5191         case SNK_TRYWAIT_VBUS:
5192                 if (tcpm_port_is_sink(port))
5193                         tcpm_set_state(port, SNK_ATTACHED, 0);
5194                 break;
5195         case SNK_TRYWAIT_DEBOUNCE:
5196                 /* Do nothing, waiting for Rp */
5197                 break;
5198         case SNK_TRY_WAIT_DEBOUNCE_CHECK_VBUS:
5199                 if (port->vbus_present && tcpm_port_is_sink(port))
5200                         tcpm_set_state(port, SNK_ATTACHED, 0);
5201                 break;
5202         case SRC_TRY_WAIT:
5203         case SRC_TRY_DEBOUNCE:
5204                 /* Do nothing, waiting for sink detection */
5205                 break;
5206         case FR_SWAP_SEND:
5207         case FR_SWAP_SEND_TIMEOUT:
5208         case FR_SWAP_SNK_SRC_TRANSITION_TO_OFF:
5209         case FR_SWAP_SNK_SRC_SOURCE_VBUS_APPLIED:
5210                 if (port->tcpc->frs_sourcing_vbus)
5211                         port->tcpc->frs_sourcing_vbus(port->tcpc);
5212                 break;
5213         case FR_SWAP_SNK_SRC_NEW_SINK_READY:
5214                 if (port->tcpc->frs_sourcing_vbus)
5215                         port->tcpc->frs_sourcing_vbus(port->tcpc);
5216                 tcpm_set_state(port, FR_SWAP_SNK_SRC_SOURCE_VBUS_APPLIED, 0);
5217                 break;
5218
5219         case PORT_RESET:
5220         case PORT_RESET_WAIT_OFF:
5221                 /*
5222                  * State set back to default mode once the timer completes.
5223                  * Ignore vbus changes here.
5224                  */
5225                 break;
5226
5227         default:
5228                 break;
5229         }
5230 }
5231
5232 static void _tcpm_pd_vbus_off(struct tcpm_port *port)
5233 {
5234         tcpm_log_force(port, "VBUS off");
5235         port->vbus_present = false;
5236         port->vbus_never_low = false;
5237         switch (port->state) {
5238         case SNK_HARD_RESET_SINK_OFF:
5239                 tcpm_set_state(port, SNK_HARD_RESET_WAIT_VBUS, 0);
5240                 break;
5241         case HARD_RESET_SEND:
5242                 break;
5243         case SNK_TRY:
5244                 /* Do nothing, waiting for timeout */
5245                 break;
5246         case SRC_TRYWAIT:
5247                 /* Hand over to state machine if needed */
5248                 if (tcpm_port_is_source(port))
5249                         tcpm_set_state(port, SRC_TRYWAIT_DEBOUNCE, 0);
5250                 break;
5251         case SNK_TRY_WAIT_DEBOUNCE:
5252                 /* Do nothing, waiting for PD_DEBOUNCE to do be done */
5253                 break;
5254         case SNK_TRYWAIT:
5255         case SNK_TRYWAIT_VBUS:
5256         case SNK_TRYWAIT_DEBOUNCE:
5257                 break;
5258         case SNK_ATTACH_WAIT:
5259         case SNK_DEBOUNCED:
5260                 /* Do nothing, as TCPM is still waiting for vbus to reaach VSAFE5V to connect */
5261                 break;
5262
5263         case SNK_NEGOTIATE_CAPABILITIES:
5264                 break;
5265
5266         case PR_SWAP_SRC_SNK_TRANSITION_OFF:
5267                 tcpm_set_state(port, PR_SWAP_SRC_SNK_SOURCE_OFF, 0);
5268                 break;
5269
5270         case PR_SWAP_SNK_SRC_SINK_OFF:
5271                 /* Do nothing, expected */
5272                 break;
5273
5274         case PR_SWAP_SNK_SRC_SOURCE_ON:
5275                 /*
5276                  * Do nothing when vbus off notification is received.
5277                  * TCPM can wait for PD_T_NEWSRC in PR_SWAP_SNK_SRC_SOURCE_ON
5278                  * for the vbus source to ramp up.
5279                  */
5280                 break;
5281
5282         case PORT_RESET_WAIT_OFF:
5283                 tcpm_set_state(port, tcpm_default_state(port), 0);
5284                 break;
5285
5286         case SRC_TRY_WAIT:
5287         case SRC_TRY_DEBOUNCE:
5288                 /* Do nothing, waiting for sink detection */
5289                 break;
5290
5291         case SRC_STARTUP:
5292         case SRC_SEND_CAPABILITIES:
5293         case SRC_SEND_CAPABILITIES_TIMEOUT:
5294         case SRC_NEGOTIATE_CAPABILITIES:
5295         case SRC_TRANSITION_SUPPLY:
5296         case SRC_READY:
5297         case SRC_WAIT_NEW_CAPABILITIES:
5298                 /*
5299                  * Force to unattached state to re-initiate connection.
5300                  * DRP port should move to Unattached.SNK instead of Unattached.SRC if
5301                  * sink removed. Although sink removal here is due to source's vbus collapse,
5302                  * treat it the same way for consistency.
5303                  */
5304                 if (port->port_type == TYPEC_PORT_SRC)
5305                         tcpm_set_state(port, SRC_UNATTACHED, tcpm_wait_for_discharge(port));
5306                 else
5307                         tcpm_set_state(port, SNK_UNATTACHED, tcpm_wait_for_discharge(port));
5308                 break;
5309
5310         case PORT_RESET:
5311                 /*
5312                  * State set back to default mode once the timer completes.
5313                  * Ignore vbus changes here.
5314                  */
5315                 break;
5316
5317         case FR_SWAP_SEND:
5318         case FR_SWAP_SEND_TIMEOUT:
5319         case FR_SWAP_SNK_SRC_TRANSITION_TO_OFF:
5320         case FR_SWAP_SNK_SRC_NEW_SINK_READY:
5321         case FR_SWAP_SNK_SRC_SOURCE_VBUS_APPLIED:
5322                 /* Do nothing, vbus drop expected */
5323                 break;
5324
5325         case SNK_HARD_RESET_WAIT_VBUS:
5326                 /* Do nothing, its OK to receive vbus off events */
5327                 break;
5328
5329         default:
5330                 if (port->pwr_role == TYPEC_SINK && port->attached)
5331                         tcpm_set_state(port, SNK_UNATTACHED, tcpm_wait_for_discharge(port));
5332                 break;
5333         }
5334 }
5335
5336 static void _tcpm_pd_vbus_vsafe0v(struct tcpm_port *port)
5337 {
5338         tcpm_log_force(port, "VBUS VSAFE0V");
5339         port->vbus_vsafe0v = true;
5340         switch (port->state) {
5341         case SRC_HARD_RESET_VBUS_OFF:
5342                 /*
5343                  * After establishing the vSafe0V voltage condition on VBUS, the Source Shall wait
5344                  * tSrcRecover before re-applying VCONN and restoring VBUS to vSafe5V.
5345                  */
5346                 tcpm_set_state(port, SRC_HARD_RESET_VBUS_ON, PD_T_SRC_RECOVER);
5347                 break;
5348         case SRC_ATTACH_WAIT:
5349                 if (tcpm_port_is_source(port))
5350                         tcpm_set_state(port, tcpm_try_snk(port) ? SNK_TRY : SRC_ATTACHED,
5351                                        PD_T_CC_DEBOUNCE);
5352                 break;
5353         case SRC_STARTUP:
5354         case SRC_SEND_CAPABILITIES:
5355         case SRC_SEND_CAPABILITIES_TIMEOUT:
5356         case SRC_NEGOTIATE_CAPABILITIES:
5357         case SRC_TRANSITION_SUPPLY:
5358         case SRC_READY:
5359         case SRC_WAIT_NEW_CAPABILITIES:
5360                 if (port->auto_vbus_discharge_enabled) {
5361                         if (port->port_type == TYPEC_PORT_SRC)
5362                                 tcpm_set_state(port, SRC_UNATTACHED, 0);
5363                         else
5364                                 tcpm_set_state(port, SNK_UNATTACHED, 0);
5365                 }
5366                 break;
5367         case PR_SWAP_SNK_SRC_SINK_OFF:
5368         case PR_SWAP_SNK_SRC_SOURCE_ON:
5369                 /* Do nothing, vsafe0v is expected during transition */
5370                 break;
5371         case SNK_ATTACH_WAIT:
5372         case SNK_DEBOUNCED:
5373                 /*Do nothing, still waiting for VSAFE5V for connect */
5374                 break;
5375         case SNK_HARD_RESET_WAIT_VBUS:
5376                 /* Do nothing, its OK to receive vbus off events */
5377                 break;
5378         default:
5379                 if (port->pwr_role == TYPEC_SINK && port->auto_vbus_discharge_enabled)
5380                         tcpm_set_state(port, SNK_UNATTACHED, 0);
5381                 break;
5382         }
5383 }
5384
5385 static void _tcpm_pd_hard_reset(struct tcpm_port *port)
5386 {
5387         tcpm_log_force(port, "Received hard reset");
5388         if (port->bist_request == BDO_MODE_TESTDATA && port->tcpc->set_bist_data)
5389                 port->tcpc->set_bist_data(port->tcpc, false);
5390
5391         if (port->ams != NONE_AMS)
5392                 port->ams = NONE_AMS;
5393         if (port->hard_reset_count < PD_N_HARD_RESET_COUNT)
5394                 port->ams = HARD_RESET;
5395         /*
5396          * If we keep receiving hard reset requests, executing the hard reset
5397          * must have failed. Revert to error recovery if that happens.
5398          */
5399         tcpm_set_state(port,
5400                        port->hard_reset_count < PD_N_HARD_RESET_COUNT ?
5401                                 HARD_RESET_START : ERROR_RECOVERY,
5402                        0);
5403 }
5404
5405 static void tcpm_pd_event_handler(struct kthread_work *work)
5406 {
5407         struct tcpm_port *port = container_of(work, struct tcpm_port,
5408                                               event_work);
5409         u32 events;
5410
5411         mutex_lock(&port->lock);
5412
5413         spin_lock(&port->pd_event_lock);
5414         while (port->pd_events) {
5415                 events = port->pd_events;
5416                 port->pd_events = 0;
5417                 spin_unlock(&port->pd_event_lock);
5418                 if (events & TCPM_RESET_EVENT)
5419                         _tcpm_pd_hard_reset(port);
5420                 if (events & TCPM_VBUS_EVENT) {
5421                         bool vbus;
5422
5423                         vbus = port->tcpc->get_vbus(port->tcpc);
5424                         if (vbus) {
5425                                 _tcpm_pd_vbus_on(port);
5426                         } else {
5427                                 _tcpm_pd_vbus_off(port);
5428                                 /*
5429                                  * When TCPC does not support detecting vsafe0v voltage level,
5430                                  * treat vbus absent as vsafe0v. Else invoke is_vbus_vsafe0v
5431                                  * to see if vbus has discharge to VSAFE0V.
5432                                  */
5433                                 if (!port->tcpc->is_vbus_vsafe0v ||
5434                                     port->tcpc->is_vbus_vsafe0v(port->tcpc))
5435                                         _tcpm_pd_vbus_vsafe0v(port);
5436                         }
5437                 }
5438                 if (events & TCPM_CC_EVENT) {
5439                         enum typec_cc_status cc1, cc2;
5440
5441                         if (port->tcpc->get_cc(port->tcpc, &cc1, &cc2) == 0)
5442                                 _tcpm_cc_change(port, cc1, cc2);
5443                 }
5444                 if (events & TCPM_FRS_EVENT) {
5445                         if (port->state == SNK_READY) {
5446                                 int ret;
5447
5448                                 port->upcoming_state = FR_SWAP_SEND;
5449                                 ret = tcpm_ams_start(port, FAST_ROLE_SWAP);
5450                                 if (ret == -EAGAIN)
5451                                         port->upcoming_state = INVALID_STATE;
5452                         } else {
5453                                 tcpm_log(port, "Discarding FRS_SIGNAL! Not in sink ready");
5454                         }
5455                 }
5456                 if (events & TCPM_SOURCING_VBUS) {
5457                         tcpm_log(port, "sourcing vbus");
5458                         /*
5459                          * In fast role swap case TCPC autonomously sources vbus. Set vbus_source
5460                          * true as TCPM wouldn't have called tcpm_set_vbus.
5461                          *
5462                          * When vbus is sourced on the command on TCPM i.e. TCPM called
5463                          * tcpm_set_vbus to source vbus, vbus_source would already be true.
5464                          */
5465                         port->vbus_source = true;
5466                         _tcpm_pd_vbus_on(port);
5467                 }
5468                 if (events & TCPM_PORT_CLEAN) {
5469                         tcpm_log(port, "port clean");
5470                         if (port->state == CHECK_CONTAMINANT) {
5471                                 if (tcpm_start_toggling(port, tcpm_rp_cc(port)))
5472                                         tcpm_set_state(port, TOGGLING, 0);
5473                                 else
5474                                         tcpm_set_state(port, tcpm_default_state(port), 0);
5475                         }
5476                 }
5477
5478                 spin_lock(&port->pd_event_lock);
5479         }
5480         spin_unlock(&port->pd_event_lock);
5481         mutex_unlock(&port->lock);
5482 }
5483
5484 void tcpm_cc_change(struct tcpm_port *port)
5485 {
5486         spin_lock(&port->pd_event_lock);
5487         port->pd_events |= TCPM_CC_EVENT;
5488         spin_unlock(&port->pd_event_lock);
5489         kthread_queue_work(port->wq, &port->event_work);
5490 }
5491 EXPORT_SYMBOL_GPL(tcpm_cc_change);
5492
5493 void tcpm_vbus_change(struct tcpm_port *port)
5494 {
5495         spin_lock(&port->pd_event_lock);
5496         port->pd_events |= TCPM_VBUS_EVENT;
5497         spin_unlock(&port->pd_event_lock);
5498         kthread_queue_work(port->wq, &port->event_work);
5499 }
5500 EXPORT_SYMBOL_GPL(tcpm_vbus_change);
5501
5502 void tcpm_pd_hard_reset(struct tcpm_port *port)
5503 {
5504         spin_lock(&port->pd_event_lock);
5505         port->pd_events = TCPM_RESET_EVENT;
5506         spin_unlock(&port->pd_event_lock);
5507         kthread_queue_work(port->wq, &port->event_work);
5508 }
5509 EXPORT_SYMBOL_GPL(tcpm_pd_hard_reset);
5510
5511 void tcpm_sink_frs(struct tcpm_port *port)
5512 {
5513         spin_lock(&port->pd_event_lock);
5514         port->pd_events |= TCPM_FRS_EVENT;
5515         spin_unlock(&port->pd_event_lock);
5516         kthread_queue_work(port->wq, &port->event_work);
5517 }
5518 EXPORT_SYMBOL_GPL(tcpm_sink_frs);
5519
5520 void tcpm_sourcing_vbus(struct tcpm_port *port)
5521 {
5522         spin_lock(&port->pd_event_lock);
5523         port->pd_events |= TCPM_SOURCING_VBUS;
5524         spin_unlock(&port->pd_event_lock);
5525         kthread_queue_work(port->wq, &port->event_work);
5526 }
5527 EXPORT_SYMBOL_GPL(tcpm_sourcing_vbus);
5528
5529 void tcpm_port_clean(struct tcpm_port *port)
5530 {
5531         spin_lock(&port->pd_event_lock);
5532         port->pd_events |= TCPM_PORT_CLEAN;
5533         spin_unlock(&port->pd_event_lock);
5534         kthread_queue_work(port->wq, &port->event_work);
5535 }
5536 EXPORT_SYMBOL_GPL(tcpm_port_clean);
5537
5538 bool tcpm_port_is_toggling(struct tcpm_port *port)
5539 {
5540         return port->port_type == TYPEC_PORT_DRP && port->state == TOGGLING;
5541 }
5542 EXPORT_SYMBOL_GPL(tcpm_port_is_toggling);
5543
5544 static void tcpm_enable_frs_work(struct kthread_work *work)
5545 {
5546         struct tcpm_port *port = container_of(work, struct tcpm_port, enable_frs);
5547         int ret;
5548
5549         mutex_lock(&port->lock);
5550         /* Not FRS capable */
5551         if (!port->connected || port->port_type != TYPEC_PORT_DRP ||
5552             port->pwr_opmode != TYPEC_PWR_MODE_PD ||
5553             !port->tcpc->enable_frs ||
5554             /* Sink caps queried */
5555             port->sink_cap_done || port->negotiated_rev < PD_REV30)
5556                 goto unlock;
5557
5558         /* Send when the state machine is idle */
5559         if (port->state != SNK_READY || port->vdm_sm_running || port->send_discover)
5560                 goto resched;
5561
5562         port->upcoming_state = GET_SINK_CAP;
5563         ret = tcpm_ams_start(port, GET_SINK_CAPABILITIES);
5564         if (ret == -EAGAIN) {
5565                 port->upcoming_state = INVALID_STATE;
5566         } else {
5567                 port->sink_cap_done = true;
5568                 goto unlock;
5569         }
5570 resched:
5571         mod_enable_frs_delayed_work(port, GET_SINK_CAP_RETRY_MS);
5572 unlock:
5573         mutex_unlock(&port->lock);
5574 }
5575
5576 static void tcpm_send_discover_work(struct kthread_work *work)
5577 {
5578         struct tcpm_port *port = container_of(work, struct tcpm_port, send_discover_work);
5579
5580         mutex_lock(&port->lock);
5581         /* No need to send DISCOVER_IDENTITY anymore */
5582         if (!port->send_discover)
5583                 goto unlock;
5584
5585         if (port->data_role == TYPEC_DEVICE && port->negotiated_rev < PD_REV30) {
5586                 port->send_discover = false;
5587                 goto unlock;
5588         }
5589
5590         /* Retry if the port is not idle */
5591         if ((port->state != SRC_READY && port->state != SNK_READY) || port->vdm_sm_running) {
5592                 mod_send_discover_delayed_work(port, SEND_DISCOVER_RETRY_MS);
5593                 goto unlock;
5594         }
5595
5596         tcpm_send_vdm(port, USB_SID_PD, CMD_DISCOVER_IDENT, NULL, 0);
5597
5598 unlock:
5599         mutex_unlock(&port->lock);
5600 }
5601
5602 static int tcpm_dr_set(struct typec_port *p, enum typec_data_role data)
5603 {
5604         struct tcpm_port *port = typec_get_drvdata(p);
5605         int ret;
5606
5607         mutex_lock(&port->swap_lock);
5608         mutex_lock(&port->lock);
5609
5610         if (port->typec_caps.data != TYPEC_PORT_DRD) {
5611                 ret = -EINVAL;
5612                 goto port_unlock;
5613         }
5614         if (port->state != SRC_READY && port->state != SNK_READY) {
5615                 ret = -EAGAIN;
5616                 goto port_unlock;
5617         }
5618
5619         if (port->data_role == data) {
5620                 ret = 0;
5621                 goto port_unlock;
5622         }
5623
5624         /*
5625          * XXX
5626          * 6.3.9: If an alternate mode is active, a request to swap
5627          * alternate modes shall trigger a port reset.
5628          * Reject data role swap request in this case.
5629          */
5630
5631         if (!port->pd_capable) {
5632                 /*
5633                  * If the partner is not PD capable, reset the port to
5634                  * trigger a role change. This can only work if a preferred
5635                  * role is configured, and if it matches the requested role.
5636                  */
5637                 if (port->try_role == TYPEC_NO_PREFERRED_ROLE ||
5638                     port->try_role == port->pwr_role) {
5639                         ret = -EINVAL;
5640                         goto port_unlock;
5641                 }
5642                 port->non_pd_role_swap = true;
5643                 tcpm_set_state(port, PORT_RESET, 0);
5644         } else {
5645                 port->upcoming_state = DR_SWAP_SEND;
5646                 ret = tcpm_ams_start(port, DATA_ROLE_SWAP);
5647                 if (ret == -EAGAIN) {
5648                         port->upcoming_state = INVALID_STATE;
5649                         goto port_unlock;
5650                 }
5651         }
5652
5653         port->swap_status = 0;
5654         port->swap_pending = true;
5655         reinit_completion(&port->swap_complete);
5656         mutex_unlock(&port->lock);
5657
5658         if (!wait_for_completion_timeout(&port->swap_complete,
5659                                 msecs_to_jiffies(PD_ROLE_SWAP_TIMEOUT)))
5660                 ret = -ETIMEDOUT;
5661         else
5662                 ret = port->swap_status;
5663
5664         port->non_pd_role_swap = false;
5665         goto swap_unlock;
5666
5667 port_unlock:
5668         mutex_unlock(&port->lock);
5669 swap_unlock:
5670         mutex_unlock(&port->swap_lock);
5671         return ret;
5672 }
5673
5674 static int tcpm_pr_set(struct typec_port *p, enum typec_role role)
5675 {
5676         struct tcpm_port *port = typec_get_drvdata(p);
5677         int ret;
5678
5679         mutex_lock(&port->swap_lock);
5680         mutex_lock(&port->lock);
5681
5682         if (port->port_type != TYPEC_PORT_DRP) {
5683                 ret = -EINVAL;
5684                 goto port_unlock;
5685         }
5686         if (port->state != SRC_READY && port->state != SNK_READY) {
5687                 ret = -EAGAIN;
5688                 goto port_unlock;
5689         }
5690
5691         if (role == port->pwr_role) {
5692                 ret = 0;
5693                 goto port_unlock;
5694         }
5695
5696         port->upcoming_state = PR_SWAP_SEND;
5697         ret = tcpm_ams_start(port, POWER_ROLE_SWAP);
5698         if (ret == -EAGAIN) {
5699                 port->upcoming_state = INVALID_STATE;
5700                 goto port_unlock;
5701         }
5702
5703         port->swap_status = 0;
5704         port->swap_pending = true;
5705         reinit_completion(&port->swap_complete);
5706         mutex_unlock(&port->lock);
5707
5708         if (!wait_for_completion_timeout(&port->swap_complete,
5709                                 msecs_to_jiffies(PD_ROLE_SWAP_TIMEOUT)))
5710                 ret = -ETIMEDOUT;
5711         else
5712                 ret = port->swap_status;
5713
5714         goto swap_unlock;
5715
5716 port_unlock:
5717         mutex_unlock(&port->lock);
5718 swap_unlock:
5719         mutex_unlock(&port->swap_lock);
5720         return ret;
5721 }
5722
5723 static int tcpm_vconn_set(struct typec_port *p, enum typec_role role)
5724 {
5725         struct tcpm_port *port = typec_get_drvdata(p);
5726         int ret;
5727
5728         mutex_lock(&port->swap_lock);
5729         mutex_lock(&port->lock);
5730
5731         if (port->state != SRC_READY && port->state != SNK_READY) {
5732                 ret = -EAGAIN;
5733                 goto port_unlock;
5734         }
5735
5736         if (role == port->vconn_role) {
5737                 ret = 0;
5738                 goto port_unlock;
5739         }
5740
5741         port->upcoming_state = VCONN_SWAP_SEND;
5742         ret = tcpm_ams_start(port, VCONN_SWAP);
5743         if (ret == -EAGAIN) {
5744                 port->upcoming_state = INVALID_STATE;
5745                 goto port_unlock;
5746         }
5747
5748         port->swap_status = 0;
5749         port->swap_pending = true;
5750         reinit_completion(&port->swap_complete);
5751         mutex_unlock(&port->lock);
5752
5753         if (!wait_for_completion_timeout(&port->swap_complete,
5754                                 msecs_to_jiffies(PD_ROLE_SWAP_TIMEOUT)))
5755                 ret = -ETIMEDOUT;
5756         else
5757                 ret = port->swap_status;
5758
5759         goto swap_unlock;
5760
5761 port_unlock:
5762         mutex_unlock(&port->lock);
5763 swap_unlock:
5764         mutex_unlock(&port->swap_lock);
5765         return ret;
5766 }
5767
5768 static int tcpm_try_role(struct typec_port *p, int role)
5769 {
5770         struct tcpm_port *port = typec_get_drvdata(p);
5771         struct tcpc_dev *tcpc = port->tcpc;
5772         int ret = 0;
5773
5774         mutex_lock(&port->lock);
5775         if (tcpc->try_role)
5776                 ret = tcpc->try_role(tcpc, role);
5777         if (!ret)
5778                 port->try_role = role;
5779         port->try_src_count = 0;
5780         port->try_snk_count = 0;
5781         mutex_unlock(&port->lock);
5782
5783         return ret;
5784 }
5785
5786 static int tcpm_pps_set_op_curr(struct tcpm_port *port, u16 req_op_curr)
5787 {
5788         unsigned int target_mw;
5789         int ret;
5790
5791         mutex_lock(&port->swap_lock);
5792         mutex_lock(&port->lock);
5793
5794         if (!port->pps_data.active) {
5795                 ret = -EOPNOTSUPP;
5796                 goto port_unlock;
5797         }
5798
5799         if (port->state != SNK_READY) {
5800                 ret = -EAGAIN;
5801                 goto port_unlock;
5802         }
5803
5804         if (req_op_curr > port->pps_data.max_curr) {
5805                 ret = -EINVAL;
5806                 goto port_unlock;
5807         }
5808
5809         target_mw = (req_op_curr * port->supply_voltage) / 1000;
5810         if (target_mw < port->operating_snk_mw) {
5811                 ret = -EINVAL;
5812                 goto port_unlock;
5813         }
5814
5815         port->upcoming_state = SNK_NEGOTIATE_PPS_CAPABILITIES;
5816         ret = tcpm_ams_start(port, POWER_NEGOTIATION);
5817         if (ret == -EAGAIN) {
5818                 port->upcoming_state = INVALID_STATE;
5819                 goto port_unlock;
5820         }
5821
5822         /* Round down operating current to align with PPS valid steps */
5823         req_op_curr = req_op_curr - (req_op_curr % RDO_PROG_CURR_MA_STEP);
5824
5825         reinit_completion(&port->pps_complete);
5826         port->pps_data.req_op_curr = req_op_curr;
5827         port->pps_status = 0;
5828         port->pps_pending = true;
5829         mutex_unlock(&port->lock);
5830
5831         if (!wait_for_completion_timeout(&port->pps_complete,
5832                                 msecs_to_jiffies(PD_PPS_CTRL_TIMEOUT)))
5833                 ret = -ETIMEDOUT;
5834         else
5835                 ret = port->pps_status;
5836
5837         goto swap_unlock;
5838
5839 port_unlock:
5840         mutex_unlock(&port->lock);
5841 swap_unlock:
5842         mutex_unlock(&port->swap_lock);
5843
5844         return ret;
5845 }
5846
5847 static int tcpm_pps_set_out_volt(struct tcpm_port *port, u16 req_out_volt)
5848 {
5849         unsigned int target_mw;
5850         int ret;
5851
5852         mutex_lock(&port->swap_lock);
5853         mutex_lock(&port->lock);
5854
5855         if (!port->pps_data.active) {
5856                 ret = -EOPNOTSUPP;
5857                 goto port_unlock;
5858         }
5859
5860         if (port->state != SNK_READY) {
5861                 ret = -EAGAIN;
5862                 goto port_unlock;
5863         }
5864
5865         target_mw = (port->current_limit * req_out_volt) / 1000;
5866         if (target_mw < port->operating_snk_mw) {
5867                 ret = -EINVAL;
5868                 goto port_unlock;
5869         }
5870
5871         port->upcoming_state = SNK_NEGOTIATE_PPS_CAPABILITIES;
5872         ret = tcpm_ams_start(port, POWER_NEGOTIATION);
5873         if (ret == -EAGAIN) {
5874                 port->upcoming_state = INVALID_STATE;
5875                 goto port_unlock;
5876         }
5877
5878         /* Round down output voltage to align with PPS valid steps */
5879         req_out_volt = req_out_volt - (req_out_volt % RDO_PROG_VOLT_MV_STEP);
5880
5881         reinit_completion(&port->pps_complete);
5882         port->pps_data.req_out_volt = req_out_volt;
5883         port->pps_status = 0;
5884         port->pps_pending = true;
5885         mutex_unlock(&port->lock);
5886
5887         if (!wait_for_completion_timeout(&port->pps_complete,
5888                                 msecs_to_jiffies(PD_PPS_CTRL_TIMEOUT)))
5889                 ret = -ETIMEDOUT;
5890         else
5891                 ret = port->pps_status;
5892
5893         goto swap_unlock;
5894
5895 port_unlock:
5896         mutex_unlock(&port->lock);
5897 swap_unlock:
5898         mutex_unlock(&port->swap_lock);
5899
5900         return ret;
5901 }
5902
5903 static int tcpm_pps_activate(struct tcpm_port *port, bool activate)
5904 {
5905         int ret = 0;
5906
5907         mutex_lock(&port->swap_lock);
5908         mutex_lock(&port->lock);
5909
5910         if (!port->pps_data.supported) {
5911                 ret = -EOPNOTSUPP;
5912                 goto port_unlock;
5913         }
5914
5915         /* Trying to deactivate PPS when already deactivated so just bail */
5916         if (!port->pps_data.active && !activate)
5917                 goto port_unlock;
5918
5919         if (port->state != SNK_READY) {
5920                 ret = -EAGAIN;
5921                 goto port_unlock;
5922         }
5923
5924         if (activate)
5925                 port->upcoming_state = SNK_NEGOTIATE_PPS_CAPABILITIES;
5926         else
5927                 port->upcoming_state = SNK_NEGOTIATE_CAPABILITIES;
5928         ret = tcpm_ams_start(port, POWER_NEGOTIATION);
5929         if (ret == -EAGAIN) {
5930                 port->upcoming_state = INVALID_STATE;
5931                 goto port_unlock;
5932         }
5933
5934         reinit_completion(&port->pps_complete);
5935         port->pps_status = 0;
5936         port->pps_pending = true;
5937
5938         /* Trigger PPS request or move back to standard PDO contract */
5939         if (activate) {
5940                 port->pps_data.req_out_volt = port->supply_voltage;
5941                 port->pps_data.req_op_curr = port->current_limit;
5942         }
5943         mutex_unlock(&port->lock);
5944
5945         if (!wait_for_completion_timeout(&port->pps_complete,
5946                                 msecs_to_jiffies(PD_PPS_CTRL_TIMEOUT)))
5947                 ret = -ETIMEDOUT;
5948         else
5949                 ret = port->pps_status;
5950
5951         goto swap_unlock;
5952
5953 port_unlock:
5954         mutex_unlock(&port->lock);
5955 swap_unlock:
5956         mutex_unlock(&port->swap_lock);
5957
5958         return ret;
5959 }
5960
5961 static void tcpm_init(struct tcpm_port *port)
5962 {
5963         enum typec_cc_status cc1, cc2;
5964
5965         port->tcpc->init(port->tcpc);
5966
5967         tcpm_reset_port(port);
5968
5969         /*
5970          * XXX
5971          * Should possibly wait for VBUS to settle if it was enabled locally
5972          * since tcpm_reset_port() will disable VBUS.
5973          */
5974         port->vbus_present = port->tcpc->get_vbus(port->tcpc);
5975         if (port->vbus_present)
5976                 port->vbus_never_low = true;
5977
5978         /*
5979          * 1. When vbus_present is true, voltage on VBUS is already at VSAFE5V.
5980          * So implicitly vbus_vsafe0v = false.
5981          *
5982          * 2. When vbus_present is false and TCPC does NOT support querying
5983          * vsafe0v status, then, it's best to assume vbus is at VSAFE0V i.e.
5984          * vbus_vsafe0v is true.
5985          *
5986          * 3. When vbus_present is false and TCPC does support querying vsafe0v,
5987          * then, query tcpc for vsafe0v status.
5988          */
5989         if (port->vbus_present)
5990                 port->vbus_vsafe0v = false;
5991         else if (!port->tcpc->is_vbus_vsafe0v)
5992                 port->vbus_vsafe0v = true;
5993         else
5994                 port->vbus_vsafe0v = port->tcpc->is_vbus_vsafe0v(port->tcpc);
5995
5996         tcpm_set_state(port, tcpm_default_state(port), 0);
5997
5998         if (port->tcpc->get_cc(port->tcpc, &cc1, &cc2) == 0)
5999                 _tcpm_cc_change(port, cc1, cc2);
6000
6001         /*
6002          * Some adapters need a clean slate at startup, and won't recover
6003          * otherwise. So do not try to be fancy and force a clean disconnect.
6004          */
6005         tcpm_set_state(port, PORT_RESET, 0);
6006 }
6007
6008 static int tcpm_port_type_set(struct typec_port *p, enum typec_port_type type)
6009 {
6010         struct tcpm_port *port = typec_get_drvdata(p);
6011
6012         mutex_lock(&port->lock);
6013         if (type == port->port_type)
6014                 goto port_unlock;
6015
6016         port->port_type = type;
6017
6018         if (!port->connected) {
6019                 tcpm_set_state(port, PORT_RESET, 0);
6020         } else if (type == TYPEC_PORT_SNK) {
6021                 if (!(port->pwr_role == TYPEC_SINK &&
6022                       port->data_role == TYPEC_DEVICE))
6023                         tcpm_set_state(port, PORT_RESET, 0);
6024         } else if (type == TYPEC_PORT_SRC) {
6025                 if (!(port->pwr_role == TYPEC_SOURCE &&
6026                       port->data_role == TYPEC_HOST))
6027                         tcpm_set_state(port, PORT_RESET, 0);
6028         }
6029
6030 port_unlock:
6031         mutex_unlock(&port->lock);
6032         return 0;
6033 }
6034
6035 static const struct typec_operations tcpm_ops = {
6036         .try_role = tcpm_try_role,
6037         .dr_set = tcpm_dr_set,
6038         .pr_set = tcpm_pr_set,
6039         .vconn_set = tcpm_vconn_set,
6040         .port_type_set = tcpm_port_type_set
6041 };
6042
6043 void tcpm_tcpc_reset(struct tcpm_port *port)
6044 {
6045         mutex_lock(&port->lock);
6046         /* XXX: Maintain PD connection if possible? */
6047         tcpm_init(port);
6048         mutex_unlock(&port->lock);
6049 }
6050 EXPORT_SYMBOL_GPL(tcpm_tcpc_reset);
6051
6052 static void tcpm_port_unregister_pd(struct tcpm_port *port)
6053 {
6054         usb_power_delivery_unregister_capabilities(port->port_sink_caps);
6055         port->port_sink_caps = NULL;
6056         usb_power_delivery_unregister_capabilities(port->port_source_caps);
6057         port->port_source_caps = NULL;
6058         usb_power_delivery_unregister(port->pd);
6059         port->pd = NULL;
6060 }
6061
6062 static int tcpm_port_register_pd(struct tcpm_port *port)
6063 {
6064         struct usb_power_delivery_desc desc = { port->typec_caps.pd_revision };
6065         struct usb_power_delivery_capabilities_desc caps = { };
6066         struct usb_power_delivery_capabilities *cap;
6067         int ret;
6068
6069         if (!port->nr_src_pdo && !port->nr_snk_pdo)
6070                 return 0;
6071
6072         port->pd = usb_power_delivery_register(port->dev, &desc);
6073         if (IS_ERR(port->pd)) {
6074                 ret = PTR_ERR(port->pd);
6075                 goto err_unregister;
6076         }
6077
6078         if (port->nr_src_pdo) {
6079                 memcpy_and_pad(caps.pdo, sizeof(caps.pdo), port->src_pdo,
6080                                port->nr_src_pdo * sizeof(u32), 0);
6081                 caps.role = TYPEC_SOURCE;
6082
6083                 cap = usb_power_delivery_register_capabilities(port->pd, &caps);
6084                 if (IS_ERR(cap)) {
6085                         ret = PTR_ERR(cap);
6086                         goto err_unregister;
6087                 }
6088
6089                 port->port_source_caps = cap;
6090         }
6091
6092         if (port->nr_snk_pdo) {
6093                 memcpy_and_pad(caps.pdo, sizeof(caps.pdo), port->snk_pdo,
6094                                port->nr_snk_pdo * sizeof(u32), 0);
6095                 caps.role = TYPEC_SINK;
6096
6097                 cap = usb_power_delivery_register_capabilities(port->pd, &caps);
6098                 if (IS_ERR(cap)) {
6099                         ret = PTR_ERR(cap);
6100                         goto err_unregister;
6101                 }
6102
6103                 port->port_sink_caps = cap;
6104         }
6105
6106         return 0;
6107
6108 err_unregister:
6109         tcpm_port_unregister_pd(port);
6110
6111         return ret;
6112 }
6113
6114 static int tcpm_fw_get_caps(struct tcpm_port *port,
6115                             struct fwnode_handle *fwnode)
6116 {
6117         const char *opmode_str;
6118         int ret;
6119         u32 mw, frs_current;
6120
6121         if (!fwnode)
6122                 return -EINVAL;
6123
6124         /*
6125          * This fwnode has a "compatible" property, but is never populated as a
6126          * struct device. Instead we simply parse it to read the properties.
6127          * This it breaks fw_devlink=on. To maintain backward compatibility
6128          * with existing DT files, we work around this by deleting any
6129          * fwnode_links to/from this fwnode.
6130          */
6131         fw_devlink_purge_absent_suppliers(fwnode);
6132
6133         ret = typec_get_fw_cap(&port->typec_caps, fwnode);
6134         if (ret < 0)
6135                 return ret;
6136
6137         port->port_type = port->typec_caps.type;
6138         port->pd_supported = !fwnode_property_read_bool(fwnode, "pd-disable");
6139
6140         port->slow_charger_loop = fwnode_property_read_bool(fwnode, "slow-charger-loop");
6141         if (port->port_type == TYPEC_PORT_SNK)
6142                 goto sink;
6143
6144         /* Get Source PDOs for the PD port or Source Rp value for the non-PD port */
6145         if (port->pd_supported) {
6146                 ret = fwnode_property_count_u32(fwnode, "source-pdos");
6147                 if (ret == 0)
6148                         return -EINVAL;
6149                 else if (ret < 0)
6150                         return ret;
6151
6152                 port->nr_src_pdo = min(ret, PDO_MAX_OBJECTS);
6153                 ret = fwnode_property_read_u32_array(fwnode, "source-pdos",
6154                                                      port->src_pdo, port->nr_src_pdo);
6155                 if (ret)
6156                         return ret;
6157                 ret = tcpm_validate_caps(port, port->src_pdo, port->nr_src_pdo);
6158                 if (ret)
6159                         return ret;
6160         } else {
6161                 ret = fwnode_property_read_string(fwnode, "typec-power-opmode", &opmode_str);
6162                 if (ret)
6163                         return ret;
6164                 ret = typec_find_pwr_opmode(opmode_str);
6165                 if (ret < 0)
6166                         return ret;
6167                 port->src_rp = tcpm_pwr_opmode_to_rp(ret);
6168         }
6169
6170         if (port->port_type == TYPEC_PORT_SRC)
6171                 return 0;
6172
6173 sink:
6174         port->self_powered = fwnode_property_read_bool(fwnode, "self-powered");
6175
6176         if (!port->pd_supported)
6177                 return 0;
6178
6179         /* Get sink pdos */
6180         ret = fwnode_property_count_u32(fwnode, "sink-pdos");
6181         if (ret <= 0)
6182                 return -EINVAL;
6183
6184         port->nr_snk_pdo = min(ret, PDO_MAX_OBJECTS);
6185         ret = fwnode_property_read_u32_array(fwnode, "sink-pdos",
6186                                              port->snk_pdo, port->nr_snk_pdo);
6187         if ((ret < 0) || tcpm_validate_caps(port, port->snk_pdo,
6188                                             port->nr_snk_pdo))
6189                 return -EINVAL;
6190
6191         if (fwnode_property_read_u32(fwnode, "op-sink-microwatt", &mw) < 0)
6192                 return -EINVAL;
6193         port->operating_snk_mw = mw / 1000;
6194
6195         /* FRS can only be supported by DRP ports */
6196         if (port->port_type == TYPEC_PORT_DRP) {
6197                 ret = fwnode_property_read_u32(fwnode, "new-source-frs-typec-current",
6198                                                &frs_current);
6199                 if (ret >= 0 && frs_current <= FRS_5V_3A)
6200                         port->new_source_frs_current = frs_current;
6201         }
6202
6203         /* sink-vdos is optional */
6204         ret = fwnode_property_count_u32(fwnode, "sink-vdos");
6205         if (ret < 0)
6206                 ret = 0;
6207
6208         port->nr_snk_vdo = min(ret, VDO_MAX_OBJECTS);
6209         if (port->nr_snk_vdo) {
6210                 ret = fwnode_property_read_u32_array(fwnode, "sink-vdos",
6211                                                      port->snk_vdo,
6212                                                      port->nr_snk_vdo);
6213                 if (ret < 0)
6214                         return ret;
6215         }
6216
6217         /* If sink-vdos is found, sink-vdos-v1 is expected for backward compatibility. */
6218         if (port->nr_snk_vdo) {
6219                 ret = fwnode_property_count_u32(fwnode, "sink-vdos-v1");
6220                 if (ret < 0)
6221                         return ret;
6222                 else if (ret == 0)
6223                         return -ENODATA;
6224
6225                 port->nr_snk_vdo_v1 = min(ret, VDO_MAX_OBJECTS);
6226                 ret = fwnode_property_read_u32_array(fwnode, "sink-vdos-v1",
6227                                                      port->snk_vdo_v1,
6228                                                      port->nr_snk_vdo_v1);
6229                 if (ret < 0)
6230                         return ret;
6231         }
6232
6233         return 0;
6234 }
6235
6236 /* Power Supply access to expose source power information */
6237 enum tcpm_psy_online_states {
6238         TCPM_PSY_OFFLINE = 0,
6239         TCPM_PSY_FIXED_ONLINE,
6240         TCPM_PSY_PROG_ONLINE,
6241 };
6242
6243 static enum power_supply_property tcpm_psy_props[] = {
6244         POWER_SUPPLY_PROP_USB_TYPE,
6245         POWER_SUPPLY_PROP_ONLINE,
6246         POWER_SUPPLY_PROP_VOLTAGE_MIN,
6247         POWER_SUPPLY_PROP_VOLTAGE_MAX,
6248         POWER_SUPPLY_PROP_VOLTAGE_NOW,
6249         POWER_SUPPLY_PROP_CURRENT_MAX,
6250         POWER_SUPPLY_PROP_CURRENT_NOW,
6251 };
6252
6253 static int tcpm_psy_get_online(struct tcpm_port *port,
6254                                union power_supply_propval *val)
6255 {
6256         if (port->vbus_charge) {
6257                 if (port->pps_data.active)
6258                         val->intval = TCPM_PSY_PROG_ONLINE;
6259                 else
6260                         val->intval = TCPM_PSY_FIXED_ONLINE;
6261         } else {
6262                 val->intval = TCPM_PSY_OFFLINE;
6263         }
6264
6265         return 0;
6266 }
6267
6268 static int tcpm_psy_get_voltage_min(struct tcpm_port *port,
6269                                     union power_supply_propval *val)
6270 {
6271         if (port->pps_data.active)
6272                 val->intval = port->pps_data.min_volt * 1000;
6273         else
6274                 val->intval = port->supply_voltage * 1000;
6275
6276         return 0;
6277 }
6278
6279 static int tcpm_psy_get_voltage_max(struct tcpm_port *port,
6280                                     union power_supply_propval *val)
6281 {
6282         if (port->pps_data.active)
6283                 val->intval = port->pps_data.max_volt * 1000;
6284         else
6285                 val->intval = port->supply_voltage * 1000;
6286
6287         return 0;
6288 }
6289
6290 static int tcpm_psy_get_voltage_now(struct tcpm_port *port,
6291                                     union power_supply_propval *val)
6292 {
6293         val->intval = port->supply_voltage * 1000;
6294
6295         return 0;
6296 }
6297
6298 static int tcpm_psy_get_current_max(struct tcpm_port *port,
6299                                     union power_supply_propval *val)
6300 {
6301         if (port->pps_data.active)
6302                 val->intval = port->pps_data.max_curr * 1000;
6303         else
6304                 val->intval = port->current_limit * 1000;
6305
6306         return 0;
6307 }
6308
6309 static int tcpm_psy_get_current_now(struct tcpm_port *port,
6310                                     union power_supply_propval *val)
6311 {
6312         val->intval = port->current_limit * 1000;
6313
6314         return 0;
6315 }
6316
6317 static int tcpm_psy_get_input_power_limit(struct tcpm_port *port,
6318                                           union power_supply_propval *val)
6319 {
6320         unsigned int src_mv, src_ma, max_src_uw = 0;
6321         unsigned int i, tmp;
6322
6323         for (i = 0; i < port->nr_source_caps; i++) {
6324                 u32 pdo = port->source_caps[i];
6325
6326                 if (pdo_type(pdo) == PDO_TYPE_FIXED) {
6327                         src_mv = pdo_fixed_voltage(pdo);
6328                         src_ma = pdo_max_current(pdo);
6329                         tmp = src_mv * src_ma;
6330                         max_src_uw = tmp > max_src_uw ? tmp : max_src_uw;
6331                 }
6332         }
6333
6334         val->intval = max_src_uw;
6335         return 0;
6336 }
6337
6338 static int tcpm_psy_get_prop(struct power_supply *psy,
6339                              enum power_supply_property psp,
6340                              union power_supply_propval *val)
6341 {
6342         struct tcpm_port *port = power_supply_get_drvdata(psy);
6343         int ret = 0;
6344
6345         switch (psp) {
6346         case POWER_SUPPLY_PROP_USB_TYPE:
6347                 val->intval = port->usb_type;
6348                 break;
6349         case POWER_SUPPLY_PROP_ONLINE:
6350                 ret = tcpm_psy_get_online(port, val);
6351                 break;
6352         case POWER_SUPPLY_PROP_VOLTAGE_MIN:
6353                 ret = tcpm_psy_get_voltage_min(port, val);
6354                 break;
6355         case POWER_SUPPLY_PROP_VOLTAGE_MAX:
6356                 ret = tcpm_psy_get_voltage_max(port, val);
6357                 break;
6358         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
6359                 ret = tcpm_psy_get_voltage_now(port, val);
6360                 break;
6361         case POWER_SUPPLY_PROP_CURRENT_MAX:
6362                 ret = tcpm_psy_get_current_max(port, val);
6363                 break;
6364         case POWER_SUPPLY_PROP_CURRENT_NOW:
6365                 ret = tcpm_psy_get_current_now(port, val);
6366                 break;
6367         case POWER_SUPPLY_PROP_INPUT_POWER_LIMIT:
6368                 tcpm_psy_get_input_power_limit(port, val);
6369                 break;
6370         default:
6371                 ret = -EINVAL;
6372                 break;
6373         }
6374
6375         return ret;
6376 }
6377
6378 static int tcpm_psy_set_online(struct tcpm_port *port,
6379                                const union power_supply_propval *val)
6380 {
6381         int ret;
6382
6383         switch (val->intval) {
6384         case TCPM_PSY_FIXED_ONLINE:
6385                 ret = tcpm_pps_activate(port, false);
6386                 break;
6387         case TCPM_PSY_PROG_ONLINE:
6388                 ret = tcpm_pps_activate(port, true);
6389                 break;
6390         default:
6391                 ret = -EINVAL;
6392                 break;
6393         }
6394
6395         return ret;
6396 }
6397
6398 static int tcpm_psy_set_prop(struct power_supply *psy,
6399                              enum power_supply_property psp,
6400                              const union power_supply_propval *val)
6401 {
6402         struct tcpm_port *port = power_supply_get_drvdata(psy);
6403         int ret;
6404
6405         /*
6406          * All the properties below are related to USB PD. The check needs to be
6407          * property specific when a non-pd related property is added.
6408          */
6409         if (!port->pd_supported)
6410                 return -EOPNOTSUPP;
6411
6412         switch (psp) {
6413         case POWER_SUPPLY_PROP_ONLINE:
6414                 ret = tcpm_psy_set_online(port, val);
6415                 break;
6416         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
6417                 ret = tcpm_pps_set_out_volt(port, val->intval / 1000);
6418                 break;
6419         case POWER_SUPPLY_PROP_CURRENT_NOW:
6420                 if (val->intval > port->pps_data.max_curr * 1000)
6421                         ret = -EINVAL;
6422                 else
6423                         ret = tcpm_pps_set_op_curr(port, val->intval / 1000);
6424                 break;
6425         default:
6426                 ret = -EINVAL;
6427                 break;
6428         }
6429         power_supply_changed(port->psy);
6430         return ret;
6431 }
6432
6433 static int tcpm_psy_prop_writeable(struct power_supply *psy,
6434                                    enum power_supply_property psp)
6435 {
6436         switch (psp) {
6437         case POWER_SUPPLY_PROP_ONLINE:
6438         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
6439         case POWER_SUPPLY_PROP_CURRENT_NOW:
6440                 return 1;
6441         default:
6442                 return 0;
6443         }
6444 }
6445
6446 static enum power_supply_usb_type tcpm_psy_usb_types[] = {
6447         POWER_SUPPLY_USB_TYPE_C,
6448         POWER_SUPPLY_USB_TYPE_PD,
6449         POWER_SUPPLY_USB_TYPE_PD_PPS,
6450 };
6451
6452 static const char *tcpm_psy_name_prefix = "tcpm-source-psy-";
6453
6454 static int devm_tcpm_psy_register(struct tcpm_port *port)
6455 {
6456         struct power_supply_config psy_cfg = {};
6457         const char *port_dev_name = dev_name(port->dev);
6458         size_t psy_name_len = strlen(tcpm_psy_name_prefix) +
6459                                      strlen(port_dev_name) + 1;
6460         char *psy_name;
6461
6462         psy_cfg.drv_data = port;
6463         psy_cfg.fwnode = dev_fwnode(port->dev);
6464         psy_name = devm_kzalloc(port->dev, psy_name_len, GFP_KERNEL);
6465         if (!psy_name)
6466                 return -ENOMEM;
6467
6468         snprintf(psy_name, psy_name_len, "%s%s", tcpm_psy_name_prefix,
6469                  port_dev_name);
6470         port->psy_desc.name = psy_name;
6471         port->psy_desc.type = POWER_SUPPLY_TYPE_USB;
6472         port->psy_desc.usb_types = tcpm_psy_usb_types;
6473         port->psy_desc.num_usb_types = ARRAY_SIZE(tcpm_psy_usb_types);
6474         port->psy_desc.properties = tcpm_psy_props;
6475         port->psy_desc.num_properties = ARRAY_SIZE(tcpm_psy_props);
6476         port->psy_desc.get_property = tcpm_psy_get_prop;
6477         port->psy_desc.set_property = tcpm_psy_set_prop;
6478         port->psy_desc.property_is_writeable = tcpm_psy_prop_writeable;
6479
6480         port->usb_type = POWER_SUPPLY_USB_TYPE_C;
6481
6482         port->psy = devm_power_supply_register(port->dev, &port->psy_desc,
6483                                                &psy_cfg);
6484
6485         return PTR_ERR_OR_ZERO(port->psy);
6486 }
6487
6488 static enum hrtimer_restart state_machine_timer_handler(struct hrtimer *timer)
6489 {
6490         struct tcpm_port *port = container_of(timer, struct tcpm_port, state_machine_timer);
6491
6492         if (port->registered)
6493                 kthread_queue_work(port->wq, &port->state_machine);
6494         return HRTIMER_NORESTART;
6495 }
6496
6497 static enum hrtimer_restart vdm_state_machine_timer_handler(struct hrtimer *timer)
6498 {
6499         struct tcpm_port *port = container_of(timer, struct tcpm_port, vdm_state_machine_timer);
6500
6501         if (port->registered)
6502                 kthread_queue_work(port->wq, &port->vdm_state_machine);
6503         return HRTIMER_NORESTART;
6504 }
6505
6506 static enum hrtimer_restart enable_frs_timer_handler(struct hrtimer *timer)
6507 {
6508         struct tcpm_port *port = container_of(timer, struct tcpm_port, enable_frs_timer);
6509
6510         if (port->registered)
6511                 kthread_queue_work(port->wq, &port->enable_frs);
6512         return HRTIMER_NORESTART;
6513 }
6514
6515 static enum hrtimer_restart send_discover_timer_handler(struct hrtimer *timer)
6516 {
6517         struct tcpm_port *port = container_of(timer, struct tcpm_port, send_discover_timer);
6518
6519         if (port->registered)
6520                 kthread_queue_work(port->wq, &port->send_discover_work);
6521         return HRTIMER_NORESTART;
6522 }
6523
6524 struct tcpm_port *tcpm_register_port(struct device *dev, struct tcpc_dev *tcpc)
6525 {
6526         struct tcpm_port *port;
6527         int err;
6528
6529         if (!dev || !tcpc ||
6530             !tcpc->get_vbus || !tcpc->set_cc || !tcpc->get_cc ||
6531             !tcpc->set_polarity || !tcpc->set_vconn || !tcpc->set_vbus ||
6532             !tcpc->set_pd_rx || !tcpc->set_roles || !tcpc->pd_transmit)
6533                 return ERR_PTR(-EINVAL);
6534
6535         port = devm_kzalloc(dev, sizeof(*port), GFP_KERNEL);
6536         if (!port)
6537                 return ERR_PTR(-ENOMEM);
6538
6539         port->dev = dev;
6540         port->tcpc = tcpc;
6541
6542         mutex_init(&port->lock);
6543         mutex_init(&port->swap_lock);
6544
6545         port->wq = kthread_create_worker(0, dev_name(dev));
6546         if (IS_ERR(port->wq))
6547                 return ERR_CAST(port->wq);
6548         sched_set_fifo(port->wq->task);
6549
6550         kthread_init_work(&port->state_machine, tcpm_state_machine_work);
6551         kthread_init_work(&port->vdm_state_machine, vdm_state_machine_work);
6552         kthread_init_work(&port->event_work, tcpm_pd_event_handler);
6553         kthread_init_work(&port->enable_frs, tcpm_enable_frs_work);
6554         kthread_init_work(&port->send_discover_work, tcpm_send_discover_work);
6555         hrtimer_init(&port->state_machine_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
6556         port->state_machine_timer.function = state_machine_timer_handler;
6557         hrtimer_init(&port->vdm_state_machine_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
6558         port->vdm_state_machine_timer.function = vdm_state_machine_timer_handler;
6559         hrtimer_init(&port->enable_frs_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
6560         port->enable_frs_timer.function = enable_frs_timer_handler;
6561         hrtimer_init(&port->send_discover_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
6562         port->send_discover_timer.function = send_discover_timer_handler;
6563
6564         spin_lock_init(&port->pd_event_lock);
6565
6566         init_completion(&port->tx_complete);
6567         init_completion(&port->swap_complete);
6568         init_completion(&port->pps_complete);
6569         tcpm_debugfs_init(port);
6570
6571         err = tcpm_fw_get_caps(port, tcpc->fwnode);
6572         if (err < 0)
6573                 goto out_destroy_wq;
6574
6575         port->try_role = port->typec_caps.prefer_role;
6576
6577         port->typec_caps.fwnode = tcpc->fwnode;
6578         port->typec_caps.revision = 0x0120;     /* Type-C spec release 1.2 */
6579         port->typec_caps.pd_revision = 0x0300;  /* USB-PD spec release 3.0 */
6580         port->typec_caps.svdm_version = SVDM_VER_2_0;
6581         port->typec_caps.driver_data = port;
6582         port->typec_caps.ops = &tcpm_ops;
6583         port->typec_caps.orientation_aware = 1;
6584
6585         port->partner_desc.identity = &port->partner_ident;
6586         port->port_type = port->typec_caps.type;
6587
6588         port->role_sw = usb_role_switch_get(port->dev);
6589         if (!port->role_sw)
6590                 port->role_sw = fwnode_usb_role_switch_get(tcpc->fwnode);
6591         if (IS_ERR(port->role_sw)) {
6592                 err = PTR_ERR(port->role_sw);
6593                 goto out_destroy_wq;
6594         }
6595
6596         err = devm_tcpm_psy_register(port);
6597         if (err)
6598                 goto out_role_sw_put;
6599         power_supply_changed(port->psy);
6600
6601         err = tcpm_port_register_pd(port);
6602         if (err)
6603                 goto out_role_sw_put;
6604
6605         port->typec_caps.pd = port->pd;
6606
6607         port->typec_port = typec_register_port(port->dev, &port->typec_caps);
6608         if (IS_ERR(port->typec_port)) {
6609                 err = PTR_ERR(port->typec_port);
6610                 goto out_unregister_pd;
6611         }
6612
6613         typec_port_register_altmodes(port->typec_port,
6614                                      &tcpm_altmode_ops, port,
6615                                      port->port_altmode, ALTMODE_DISCOVERY_MAX);
6616         port->registered = true;
6617
6618         mutex_lock(&port->lock);
6619         tcpm_init(port);
6620         mutex_unlock(&port->lock);
6621
6622         tcpm_log(port, "%s: registered", dev_name(dev));
6623         return port;
6624
6625 out_unregister_pd:
6626         tcpm_port_unregister_pd(port);
6627 out_role_sw_put:
6628         usb_role_switch_put(port->role_sw);
6629 out_destroy_wq:
6630         tcpm_debugfs_exit(port);
6631         kthread_destroy_worker(port->wq);
6632         return ERR_PTR(err);
6633 }
6634 EXPORT_SYMBOL_GPL(tcpm_register_port);
6635
6636 void tcpm_unregister_port(struct tcpm_port *port)
6637 {
6638         int i;
6639
6640         port->registered = false;
6641         kthread_destroy_worker(port->wq);
6642
6643         hrtimer_cancel(&port->send_discover_timer);
6644         hrtimer_cancel(&port->enable_frs_timer);
6645         hrtimer_cancel(&port->vdm_state_machine_timer);
6646         hrtimer_cancel(&port->state_machine_timer);
6647
6648         tcpm_reset_port(port);
6649
6650         tcpm_port_unregister_pd(port);
6651
6652         for (i = 0; i < ARRAY_SIZE(port->port_altmode); i++)
6653                 typec_unregister_altmode(port->port_altmode[i]);
6654         typec_unregister_port(port->typec_port);
6655         usb_role_switch_put(port->role_sw);
6656         tcpm_debugfs_exit(port);
6657 }
6658 EXPORT_SYMBOL_GPL(tcpm_unregister_port);
6659
6660 MODULE_AUTHOR("Guenter Roeck <groeck@chromium.org>");
6661 MODULE_DESCRIPTION("USB Type-C Port Manager");
6662 MODULE_LICENSE("GPL");