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/jiffies.h>
  12 #include <linux/kernel.h>
  13 #include <linux/module.h>
  14 #include <linux/mutex.h>
  15 #include <linux/power_supply.h>
  16 #include <linux/proc_fs.h>
  17 #include <linux/property.h>
  18 #include <linux/sched/clock.h>
  19 #include <linux/seq_file.h>
  20 #include <linux/slab.h>
  21 #include <linux/spinlock.h>
  22 #include <linux/usb.h>
  23 #include <linux/usb/pd.h>
  24 #include <linux/usb/pd_ado.h>
  25 #include <linux/usb/pd_bdo.h>
  26 #include <linux/usb/pd_ext_sdb.h>
  27 #include <linux/usb/pd_vdo.h>
  28 #include <linux/usb/role.h>
  29 #include <linux/usb/tcpm.h>
  30 #include <linux/usb/typec_altmode.h>
  31 #include <linux/workqueue.h>
  32
  33 #define FOREACH_STATE(S)                        \
  34         S(INVALID_STATE),                       \
  35         S(TOGGLING),                    \
  36         S(SRC_UNATTACHED),                      \
  37         S(SRC_ATTACH_WAIT),                     \
  38         S(SRC_ATTACHED),                        \
  39         S(SRC_STARTUP),                         \
  40         S(SRC_SEND_CAPABILITIES),               \
  41         S(SRC_SEND_CAPABILITIES_TIMEOUT),       \
  42         S(SRC_NEGOTIATE_CAPABILITIES),          \
  43         S(SRC_TRANSITION_SUPPLY),               \
  44         S(SRC_READY),                           \
  45         S(SRC_WAIT_NEW_CAPABILITIES),           \
  46                                                 \
  47         S(SNK_UNATTACHED),                      \
  48         S(SNK_ATTACH_WAIT),                     \
  49         S(SNK_DEBOUNCED),                       \
  50         S(SNK_ATTACHED),                        \
  51         S(SNK_STARTUP),                         \
  52         S(SNK_DISCOVERY),                       \
  53         S(SNK_DISCOVERY_DEBOUNCE),              \
  54         S(SNK_DISCOVERY_DEBOUNCE_DONE),         \
  55         S(SNK_WAIT_CAPABILITIES),               \
  56         S(SNK_NEGOTIATE_CAPABILITIES),          \
  57         S(SNK_NEGOTIATE_PPS_CAPABILITIES),      \
  58         S(SNK_TRANSITION_SINK),                 \
  59         S(SNK_TRANSITION_SINK_VBUS),            \
  60         S(SNK_READY),                           \
  61                                                 \
  62         S(ACC_UNATTACHED),                      \
  63         S(DEBUG_ACC_ATTACHED),                  \
  64         S(AUDIO_ACC_ATTACHED),                  \
  65         S(AUDIO_ACC_DEBOUNCE),                  \
  66                                                 \
  67         S(HARD_RESET_SEND),                     \
  68         S(HARD_RESET_START),                    \
  69         S(SRC_HARD_RESET_VBUS_OFF),             \
  70         S(SRC_HARD_RESET_VBUS_ON),              \
  71         S(SNK_HARD_RESET_SINK_OFF),             \
  72         S(SNK_HARD_RESET_WAIT_VBUS),            \
  73         S(SNK_HARD_RESET_SINK_ON),              \
  74                                                 \
  75         S(SOFT_RESET),                          \
  76         S(SOFT_RESET_SEND),                     \
  77                                                 \
  78         S(DR_SWAP_ACCEPT),                      \
  79         S(DR_SWAP_SEND),                        \
  80         S(DR_SWAP_SEND_TIMEOUT),                \
  81         S(DR_SWAP_CANCEL),                      \
  82         S(DR_SWAP_CHANGE_DR),                   \
  83                                                 \
  84         S(PR_SWAP_ACCEPT),                      \
  85         S(PR_SWAP_SEND),                        \
  86         S(PR_SWAP_SEND_TIMEOUT),                \
  87         S(PR_SWAP_CANCEL),                      \
  88         S(PR_SWAP_START),                       \
  89         S(PR_SWAP_SRC_SNK_TRANSITION_OFF),      \
  90         S(PR_SWAP_SRC_SNK_SOURCE_OFF),          \
  91         S(PR_SWAP_SRC_SNK_SOURCE_OFF_CC_DEBOUNCED), \
  92         S(PR_SWAP_SRC_SNK_SINK_ON),             \
  93         S(PR_SWAP_SNK_SRC_SINK_OFF),            \
  94         S(PR_SWAP_SNK_SRC_SOURCE_ON),           \
  95         S(PR_SWAP_SNK_SRC_SOURCE_ON_VBUS_RAMPED_UP),    \
  96                                                 \
  97         S(VCONN_SWAP_ACCEPT),                   \
  98         S(VCONN_SWAP_SEND),                     \
  99         S(VCONN_SWAP_SEND_TIMEOUT),             \
 100         S(VCONN_SWAP_CANCEL),                   \
 101         S(VCONN_SWAP_START),                    \
 102         S(VCONN_SWAP_WAIT_FOR_VCONN),           \
 103         S(VCONN_SWAP_TURN_ON_VCONN),            \
 104         S(VCONN_SWAP_TURN_OFF_VCONN),           \
 105                                                 \
 106         S(SNK_TRY),                             \
 107         S(SNK_TRY_WAIT),                        \
 108         S(SNK_TRY_WAIT_DEBOUNCE),               \
 109         S(SNK_TRY_WAIT_DEBOUNCE_CHECK_VBUS),    \
 110         S(SRC_TRYWAIT),                         \
 111         S(SRC_TRYWAIT_DEBOUNCE),                \
 112         S(SRC_TRYWAIT_UNATTACHED),              \
 113                                                 \
 114         S(SRC_TRY),                             \
 115         S(SRC_TRY_WAIT),                        \
 116         S(SRC_TRY_DEBOUNCE),                    \
 117         S(SNK_TRYWAIT),                         \
 118         S(SNK_TRYWAIT_DEBOUNCE),                \
 119         S(SNK_TRYWAIT_VBUS),                    \
 120         S(BIST_RX),                             \
 121                                                 \
 122         S(GET_STATUS_SEND),                     \
 123         S(GET_STATUS_SEND_TIMEOUT),             \
 124         S(GET_PPS_STATUS_SEND),                 \
 125         S(GET_PPS_STATUS_SEND_TIMEOUT),         \
 126                                                 \
 127         S(ERROR_RECOVERY),                      \
 128         S(PORT_RESET),                          \
 129         S(PORT_RESET_WAIT_OFF)
 130
 131 #define GENERATE_ENUM(e)        e
 132 #define GENERATE_STRING(s)      #s
 133
 134 enum tcpm_state {
 135         FOREACH_STATE(GENERATE_ENUM)
 136 };
 137
 138 static const char * const tcpm_states[] = {
 139         FOREACH_STATE(GENERATE_STRING)
 140 };
 141
 142 enum vdm_states {
 143         VDM_STATE_ERR_BUSY = -3,
 144         VDM_STATE_ERR_SEND = -2,
 145         VDM_STATE_ERR_TMOUT = -1,
 146         VDM_STATE_DONE = 0,
 147         /* Anything >0 represents an active state */
 148         VDM_STATE_READY = 1,
 149         VDM_STATE_BUSY = 2,
 150         VDM_STATE_WAIT_RSP_BUSY = 3,
 151 };
 152
 153 enum pd_msg_request {
 154         PD_MSG_NONE = 0,
 155         PD_MSG_CTRL_REJECT,
 156         PD_MSG_CTRL_WAIT,
 157         PD_MSG_CTRL_NOT_SUPP,
 158         PD_MSG_DATA_SINK_CAP,
 159         PD_MSG_DATA_SOURCE_CAP,
 160 };
 161
 162 /* Events from low level driver */
 163
 164 #define TCPM_CC_EVENT           BIT(0)
 165 #define TCPM_VBUS_EVENT         BIT(1)
 166 #define TCPM_RESET_EVENT        BIT(2)
 167
 168 #define LOG_BUFFER_ENTRIES      1024
 169 #define LOG_BUFFER_ENTRY_SIZE   128
 170
 171 /* Alternate mode support */
 172
 173 #define SVID_DISCOVERY_MAX      16
 174 #define ALTMODE_DISCOVERY_MAX   (SVID_DISCOVERY_MAX * MODE_DISCOVERY_MAX)
 175
 176 struct pd_mode_data {
 177         int svid_index;         /* current SVID index           */
 178         int nsvids;
 179         u16 svids[SVID_DISCOVERY_MAX];
 180         int altmodes;           /* number of alternate modes    */
 181         struct typec_altmode_desc altmode_desc[ALTMODE_DISCOVERY_MAX];
 182 };
 183
 184 struct pd_pps_data {
 185         u32 min_volt;
 186         u32 max_volt;
 187         u32 max_curr;
 188         u32 out_volt;
 189         u32 op_curr;
 190         bool supported;
 191         bool active;
 192 };
 193
 194 struct tcpm_port {
 195         struct device *dev;
 196
 197         struct mutex lock;              /* tcpm state machine lock */
 198         struct workqueue_struct *wq;
 199
 200         struct typec_capability typec_caps;
 201         struct typec_port *typec_port;
 202
 203         struct tcpc_dev *tcpc;
 204         struct usb_role_switch *role_sw;
 205
 206         enum typec_role vconn_role;
 207         enum typec_role pwr_role;
 208         enum typec_data_role data_role;
 209         enum typec_pwr_opmode pwr_opmode;
 210
 211         struct usb_pd_identity partner_ident;
 212         struct typec_partner_desc partner_desc;
 213         struct typec_partner *partner;
 214
 215         enum typec_cc_status cc_req;
 216
 217         enum typec_cc_status cc1;
 218         enum typec_cc_status cc2;
 219         enum typec_cc_polarity polarity;
 220
 221         bool attached;
 222         bool connected;
 223         enum typec_port_type port_type;
 224         bool vbus_present;
 225         bool vbus_never_low;
 226         bool vbus_source;
 227         bool vbus_charge;
 228
 229         bool send_discover;
 230         bool op_vsafe5v;
 231
 232         int try_role;
 233         int try_snk_count;
 234         int try_src_count;
 235
 236         enum pd_msg_request queued_message;
 237
 238         enum tcpm_state enter_state;
 239         enum tcpm_state prev_state;
 240         enum tcpm_state state;
 241         enum tcpm_state delayed_state;
 242         unsigned long delayed_runtime;
 243         unsigned long delay_ms;
 244
 245         spinlock_t pd_event_lock;
 246         u32 pd_events;
 247
 248         struct work_struct event_work;
 249         struct delayed_work state_machine;
 250         struct delayed_work vdm_state_machine;
 251         bool state_machine_running;
 252
 253         struct completion tx_complete;
 254         enum tcpm_transmit_status tx_status;
 255
 256         struct mutex swap_lock;         /* swap command lock */
 257         bool swap_pending;
 258         bool non_pd_role_swap;
 259         struct completion swap_complete;
 260         int swap_status;
 261
 262         unsigned int negotiated_rev;
 263         unsigned int message_id;
 264         unsigned int caps_count;
 265         unsigned int hard_reset_count;
 266         bool pd_capable;
 267         bool explicit_contract;
 268         unsigned int rx_msgid;
 269
 270         /* Partner capabilities/requests */
 271         u32 sink_request;
 272         u32 source_caps[PDO_MAX_OBJECTS];
 273         unsigned int nr_source_caps;
 274         u32 sink_caps[PDO_MAX_OBJECTS];
 275         unsigned int nr_sink_caps;
 276
 277         /* Local capabilities */
 278         u32 src_pdo[PDO_MAX_OBJECTS];
 279         unsigned int nr_src_pdo;
 280         u32 snk_pdo[PDO_MAX_OBJECTS];
 281         unsigned int nr_snk_pdo;
 282         u32 snk_vdo[VDO_MAX_OBJECTS];
 283         unsigned int nr_snk_vdo;
 284
 285         unsigned int operating_snk_mw;
 286         bool update_sink_caps;
 287
 288         /* Requested current / voltage */
 289         u32 current_limit;
 290         u32 supply_voltage;
 291
 292         /* Used to export TA voltage and current */
 293         struct power_supply *psy;
 294         struct power_supply_desc psy_desc;
 295         enum power_supply_usb_type usb_type;
 296
 297         u32 bist_request;
 298
 299         /* PD state for Vendor Defined Messages */
 300         enum vdm_states vdm_state;
 301         u32 vdm_retries;
 302         /* next Vendor Defined Message to send */
 303         u32 vdo_data[VDO_MAX_SIZE];
 304         u8 vdo_count;
 305         /* VDO to retry if UFP responder replied busy */
 306         u32 vdo_retry;
 307
 308         /* PPS */
 309         struct pd_pps_data pps_data;
 310         struct completion pps_complete;
 311         bool pps_pending;
 312         int pps_status;
 313
 314         /* Alternate mode data */
 315         struct pd_mode_data mode_data;
 316         struct typec_altmode *partner_altmode[ALTMODE_DISCOVERY_MAX];
 317         struct typec_altmode *port_altmode[ALTMODE_DISCOVERY_MAX];
 318
 319         /* Deadline in jiffies to exit src_try_wait state */
 320         unsigned long max_wait;
 321
 322         /* port belongs to a self powered device */
 323         bool self_powered;
 324
 325 #ifdef CONFIG_DEBUG_FS
 326         struct dentry *dentry;
 327         struct mutex logbuffer_lock;    /* log buffer access lock */
 328         int logbuffer_head;
 329         int logbuffer_tail;
 330         u8 *logbuffer[LOG_BUFFER_ENTRIES];
 331 #endif
 332 };
 333
 334 struct pd_rx_event {
 335         struct work_struct work;
 336         struct tcpm_port *port;
 337         struct pd_message msg;
 338 };
 339
 340 #define tcpm_cc_is_sink(cc) \
 341         ((cc) == TYPEC_CC_RP_DEF || (cc) == TYPEC_CC_RP_1_5 || \
 342          (cc) == TYPEC_CC_RP_3_0)
 343
 344 #define tcpm_port_is_sink(port) \
 345         ((tcpm_cc_is_sink((port)->cc1) && !tcpm_cc_is_sink((port)->cc2)) || \
 346          (tcpm_cc_is_sink((port)->cc2) && !tcpm_cc_is_sink((port)->cc1)))
 347
 348 #define tcpm_cc_is_source(cc) ((cc) == TYPEC_CC_RD)
 349 #define tcpm_cc_is_audio(cc) ((cc) == TYPEC_CC_RA)
 350 #define tcpm_cc_is_open(cc) ((cc) == TYPEC_CC_OPEN)
 351
 352 #define tcpm_port_is_source(port) \
 353         ((tcpm_cc_is_source((port)->cc1) && \
 354          !tcpm_cc_is_source((port)->cc2)) || \
 355          (tcpm_cc_is_source((port)->cc2) && \
 356           !tcpm_cc_is_source((port)->cc1)))
 357
 358 #define tcpm_port_is_debug(port) \
 359         (tcpm_cc_is_source((port)->cc1) && tcpm_cc_is_source((port)->cc2))
 360
 361 #define tcpm_port_is_audio(port) \
 362         (tcpm_cc_is_audio((port)->cc1) && tcpm_cc_is_audio((port)->cc2))
 363
 364 #define tcpm_port_is_audio_detached(port) \
 365         ((tcpm_cc_is_audio((port)->cc1) && tcpm_cc_is_open((port)->cc2)) || \
 366          (tcpm_cc_is_audio((port)->cc2) && tcpm_cc_is_open((port)->cc1)))
 367
 368 #define tcpm_try_snk(port) \
 369         ((port)->try_snk_count == 0 && (port)->try_role == TYPEC_SINK && \
 370         (port)->port_type == TYPEC_PORT_DRP)
 371
 372 #define tcpm_try_src(port) \
 373         ((port)->try_src_count == 0 && (port)->try_role == TYPEC_SOURCE && \
 374         (port)->port_type == TYPEC_PORT_DRP)
 375
 376 static enum tcpm_state tcpm_default_state(struct tcpm_port *port)
 377 {
 378         if (port->port_type == TYPEC_PORT_DRP) {
 379                 if (port->try_role == TYPEC_SINK)
 380                         return SNK_UNATTACHED;
 381                 else if (port->try_role == TYPEC_SOURCE)
 382                         return SRC_UNATTACHED;
 383                 else if (port->tcpc->config &&
 384                          port->tcpc->config->default_role == TYPEC_SINK)
 385                         return SNK_UNATTACHED;
 386                 /* Fall through to return SRC_UNATTACHED */
 387         } else if (port->port_type == TYPEC_PORT_SNK) {
 388                 return SNK_UNATTACHED;
 389         }
 390         return SRC_UNATTACHED;
 391 }
 392
 393 static inline
 394 struct tcpm_port *typec_cap_to_tcpm(const struct typec_capability *cap)
 395 {
 396         return container_of(cap, struct tcpm_port, typec_caps);
 397 }
 398
 399 static bool tcpm_port_is_disconnected(struct tcpm_port *port)
 400 {
 401         return (!port->attached && port->cc1 == TYPEC_CC_OPEN &&
 402                 port->cc2 == TYPEC_CC_OPEN) ||
 403                (port->attached && ((port->polarity == TYPEC_POLARITY_CC1 &&
 404                                     port->cc1 == TYPEC_CC_OPEN) ||
 405                                    (port->polarity == TYPEC_POLARITY_CC2 &&
 406                                     port->cc2 == TYPEC_CC_OPEN)));
 407 }
 408
 409 /*
 410  * Logging
 411  */
 412
 413 #ifdef CONFIG_DEBUG_FS
 414
 415 static bool tcpm_log_full(struct tcpm_port *port)
 416 {
 417         return port->logbuffer_tail ==
 418                 (port->logbuffer_head + 1) % LOG_BUFFER_ENTRIES;
 419 }
 420
 421 __printf(2, 0)
 422 static void _tcpm_log(struct tcpm_port *port, const char *fmt, va_list args)
 423 {
 424         char tmpbuffer[LOG_BUFFER_ENTRY_SIZE];
 425         u64 ts_nsec = local_clock();
 426         unsigned long rem_nsec;
 427
 428         mutex_lock(&port->logbuffer_lock);
 429         if (!port->logbuffer[port->logbuffer_head]) {
 430                 port->logbuffer[port->logbuffer_head] =
 431                                 kzalloc(LOG_BUFFER_ENTRY_SIZE, GFP_KERNEL);
 432                 if (!port->logbuffer[port->logbuffer_head]) {
 433                         mutex_unlock(&port->logbuffer_lock);
 434                         return;
 435                 }
 436         }
 437
 438         vsnprintf(tmpbuffer, sizeof(tmpbuffer), fmt, args);
 439
 440         if (tcpm_log_full(port)) {
 441                 port->logbuffer_head = max(port->logbuffer_head - 1, 0);
 442                 strcpy(tmpbuffer, "overflow");
 443         }
 444
 445         if (port->logbuffer_head < 0 ||
 446             port->logbuffer_head >= LOG_BUFFER_ENTRIES) {
 447                 dev_warn(port->dev,
 448                          "Bad log buffer index %d\n", port->logbuffer_head);
 449                 goto abort;
 450         }
 451
 452         if (!port->logbuffer[port->logbuffer_head]) {
 453                 dev_warn(port->dev,
 454                          "Log buffer index %d is NULL\n", port->logbuffer_head);
 455                 goto abort;
 456         }
 457
 458         rem_nsec = do_div(ts_nsec, 1000000000);
 459         scnprintf(port->logbuffer[port->logbuffer_head],
 460                   LOG_BUFFER_ENTRY_SIZE, "[%5lu.%06lu] %s",
 461                   (unsigned long)ts_nsec, rem_nsec / 1000,
 462                   tmpbuffer);
 463         port->logbuffer_head = (port->logbuffer_head + 1) % LOG_BUFFER_ENTRIES;
 464
 465 abort:
 466         mutex_unlock(&port->logbuffer_lock);
 467 }
 468
 469 __printf(2, 3)
 470 static void tcpm_log(struct tcpm_port *port, const char *fmt, ...)
 471 {
 472         va_list args;
 473
 474         /* Do not log while disconnected and unattached */
 475         if (tcpm_port_is_disconnected(port) &&
 476             (port->state == SRC_UNATTACHED || port->state == SNK_UNATTACHED ||
 477              port->state == TOGGLING))
 478                 return;
 479
 480         va_start(args, fmt);
 481         _tcpm_log(port, fmt, args);
 482         va_end(args);
 483 }
 484
 485 __printf(2, 3)
 486 static void tcpm_log_force(struct tcpm_port *port, const char *fmt, ...)
 487 {
 488         va_list args;
 489
 490         va_start(args, fmt);
 491         _tcpm_log(port, fmt, args);
 492         va_end(args);
 493 }
 494
 495 static void tcpm_log_source_caps(struct tcpm_port *port)
 496 {
 497         int i;
 498
 499         for (i = 0; i < port->nr_source_caps; i++) {
 500                 u32 pdo = port->source_caps[i];
 501                 enum pd_pdo_type type = pdo_type(pdo);
 502                 char msg[64];
 503
 504                 switch (type) {
 505                 case PDO_TYPE_FIXED:
 506                         scnprintf(msg, sizeof(msg),
 507                                   "%u mV, %u mA [%s%s%s%s%s%s]",
 508                                   pdo_fixed_voltage(pdo),
 509                                   pdo_max_current(pdo),
 510                                   (pdo & PDO_FIXED_DUAL_ROLE) ?
 511                                                         "R" : "",
 512                                   (pdo & PDO_FIXED_SUSPEND) ?
 513                                                         "S" : "",
 514                                   (pdo & PDO_FIXED_HIGHER_CAP) ?
 515                                                         "H" : "",
 516                                   (pdo & PDO_FIXED_USB_COMM) ?
 517                                                         "U" : "",
 518                                   (pdo & PDO_FIXED_DATA_SWAP) ?
 519                                                         "D" : "",
 520                                   (pdo & PDO_FIXED_EXTPOWER) ?
 521                                                         "E" : "");
 522                         break;
 523                 case PDO_TYPE_VAR:
 524                         scnprintf(msg, sizeof(msg),
 525                                   "%u-%u mV, %u mA",
 526                                   pdo_min_voltage(pdo),
 527                                   pdo_max_voltage(pdo),
 528                                   pdo_max_current(pdo));
 529                         break;
 530                 case PDO_TYPE_BATT:
 531                         scnprintf(msg, sizeof(msg),
 532                                   "%u-%u mV, %u mW",
 533                                   pdo_min_voltage(pdo),
 534                                   pdo_max_voltage(pdo),
 535                                   pdo_max_power(pdo));
 536                         break;
 537                 case PDO_TYPE_APDO:
 538                         if (pdo_apdo_type(pdo) == APDO_TYPE_PPS)
 539                                 scnprintf(msg, sizeof(msg),
 540                                           "%u-%u mV, %u mA",
 541                                           pdo_pps_apdo_min_voltage(pdo),
 542                                           pdo_pps_apdo_max_voltage(pdo),
 543                                           pdo_pps_apdo_max_current(pdo));
 544                         else
 545                                 strcpy(msg, "undefined APDO");
 546                         break;
 547                 default:
 548                         strcpy(msg, "undefined");
 549                         break;
 550                 }
 551                 tcpm_log(port, " PDO %d: type %d, %s",
 552                          i, type, msg);
 553         }
 554 }
 555
 556 static int tcpm_debug_show(struct seq_file *s, void *v)
 557 {
 558         struct tcpm_port *port = (struct tcpm_port *)s->private;
 559         int tail;
 560
 561         mutex_lock(&port->logbuffer_lock);
 562         tail = port->logbuffer_tail;
 563         while (tail != port->logbuffer_head) {
 564                 seq_printf(s, "%s\n", port->logbuffer[tail]);
 565                 tail = (tail + 1) % LOG_BUFFER_ENTRIES;
 566         }
 567         if (!seq_has_overflowed(s))
 568                 port->logbuffer_tail = tail;
 569         mutex_unlock(&port->logbuffer_lock);
 570
 571         return 0;
 572 }
 573 DEFINE_SHOW_ATTRIBUTE(tcpm_debug);
 574
 575 static void tcpm_debugfs_init(struct tcpm_port *port)
 576 {
 577         char name[NAME_MAX];
 578
 579         mutex_init(&port->logbuffer_lock);
 580         snprintf(name, NAME_MAX, "tcpm-%s", dev_name(port->dev));
 581         port->dentry = debugfs_create_file(name, S_IFREG | 0444, usb_debug_root,
 582                                            port, &tcpm_debug_fops);
 583 }
 584
 585 static void tcpm_debugfs_exit(struct tcpm_port *port)
 586 {
 587         int i;
 588
 589         mutex_lock(&port->logbuffer_lock);
 590         for (i = 0; i < LOG_BUFFER_ENTRIES; i++) {
 591                 kfree(port->logbuffer[i]);
 592                 port->logbuffer[i] = NULL;
 593         }
 594         mutex_unlock(&port->logbuffer_lock);
 595
 596         debugfs_remove(port->dentry);
 597 }
 598
 599 #else
 600
 601 __printf(2, 3)
 602 static void tcpm_log(const struct tcpm_port *port, const char *fmt, ...) { }
 603 __printf(2, 3)
 604 static void tcpm_log_force(struct tcpm_port *port, const char *fmt, ...) { }
 605 static void tcpm_log_source_caps(struct tcpm_port *port) { }
 606 static void tcpm_debugfs_init(const struct tcpm_port *port) { }
 607 static void tcpm_debugfs_exit(const struct tcpm_port *port) { }
 608
 609 #endif
 610
 611 static int tcpm_pd_transmit(struct tcpm_port *port,
 612                             enum tcpm_transmit_type type,
 613                             const struct pd_message *msg)
 614 {
 615         unsigned long timeout;
 616         int ret;
 617
 618         if (msg)
 619                 tcpm_log(port, "PD TX, header: %#x", le16_to_cpu(msg->header));
 620         else
 621                 tcpm_log(port, "PD TX, type: %#x", type);
 622
 623         reinit_completion(&port->tx_complete);
 624         ret = port->tcpc->pd_transmit(port->tcpc, type, msg);
 625         if (ret < 0)
 626                 return ret;
 627
 628         mutex_unlock(&port->lock);
 629         timeout = wait_for_completion_timeout(&port->tx_complete,
 630                                 msecs_to_jiffies(PD_T_TCPC_TX_TIMEOUT));
 631         mutex_lock(&port->lock);
 632         if (!timeout)
 633                 return -ETIMEDOUT;
 634
 635         switch (port->tx_status) {
 636         case TCPC_TX_SUCCESS:
 637                 port->message_id = (port->message_id + 1) & PD_HEADER_ID_MASK;
 638                 return 0;
 639         case TCPC_TX_DISCARDED:
 640                 return -EAGAIN;
 641         case TCPC_TX_FAILED:
 642         default:
 643                 return -EIO;
 644         }
 645 }
 646
 647 void tcpm_pd_transmit_complete(struct tcpm_port *port,
 648                                enum tcpm_transmit_status status)
 649 {
 650         tcpm_log(port, "PD TX complete, status: %u", status);
 651         port->tx_status = status;
 652         complete(&port->tx_complete);
 653 }
 654 EXPORT_SYMBOL_GPL(tcpm_pd_transmit_complete);
 655
 656 static int tcpm_mux_set(struct tcpm_port *port, int state,
 657                         enum usb_role usb_role,
 658                         enum typec_orientation orientation)
 659 {
 660         int ret;
 661
 662         tcpm_log(port, "Requesting mux state %d, usb-role %d, orientation %d",
 663                  state, usb_role, orientation);
 664
 665         ret = typec_set_orientation(port->typec_port, orientation);
 666         if (ret)
 667                 return ret;
 668
 669         if (port->role_sw) {
 670                 ret = usb_role_switch_set_role(port->role_sw, usb_role);
 671                 if (ret)
 672                         return ret;
 673         }
 674
 675         return typec_set_mode(port->typec_port, state);
 676 }
 677
 678 static int tcpm_set_polarity(struct tcpm_port *port,
 679                              enum typec_cc_polarity polarity)
 680 {
 681         int ret;
 682
 683         tcpm_log(port, "polarity %d", polarity);
 684
 685         ret = port->tcpc->set_polarity(port->tcpc, polarity);
 686         if (ret < 0)
 687                 return ret;
 688
 689         port->polarity = polarity;
 690
 691         return 0;
 692 }
 693
 694 static int tcpm_set_vconn(struct tcpm_port *port, bool enable)
 695 {
 696         int ret;
 697
 698         tcpm_log(port, "vconn:=%d", enable);
 699
 700         ret = port->tcpc->set_vconn(port->tcpc, enable);
 701         if (!ret) {
 702                 port->vconn_role = enable ? TYPEC_SOURCE : TYPEC_SINK;
 703                 typec_set_vconn_role(port->typec_port, port->vconn_role);
 704         }
 705
 706         return ret;
 707 }
 708
 709 static u32 tcpm_get_current_limit(struct tcpm_port *port)
 710 {
 711         enum typec_cc_status cc;
 712         u32 limit;
 713
 714         cc = port->polarity ? port->cc2 : port->cc1;
 715         switch (cc) {
 716         case TYPEC_CC_RP_1_5:
 717                 limit = 1500;
 718                 break;
 719         case TYPEC_CC_RP_3_0:
 720                 limit = 3000;
 721                 break;
 722         case TYPEC_CC_RP_DEF:
 723         default:
 724                 if (port->tcpc->get_current_limit)
 725                         limit = port->tcpc->get_current_limit(port->tcpc);
 726                 else
 727                         limit = 0;
 728                 break;
 729         }
 730
 731         return limit;
 732 }
 733
 734 static int tcpm_set_current_limit(struct tcpm_port *port, u32 max_ma, u32 mv)
 735 {
 736         int ret = -EOPNOTSUPP;
 737
 738         tcpm_log(port, "Setting voltage/current limit %u mV %u mA", mv, max_ma);
 739
 740         port->supply_voltage = mv;
 741         port->current_limit = max_ma;
 742
 743         if (port->tcpc->set_current_limit)
 744                 ret = port->tcpc->set_current_limit(port->tcpc, max_ma, mv);
 745
 746         return ret;
 747 }
 748
 749 /*
 750  * Determine RP value to set based on maximum current supported
 751  * by a port if configured as source.
 752  * Returns CC value to report to link partner.
 753  */
 754 static enum typec_cc_status tcpm_rp_cc(struct tcpm_port *port)
 755 {
 756         const u32 *src_pdo = port->src_pdo;
 757         int nr_pdo = port->nr_src_pdo;
 758         int i;
 759
 760         /*
 761          * Search for first entry with matching voltage.
 762          * It should report the maximum supported current.
 763          */
 764         for (i = 0; i < nr_pdo; i++) {
 765                 const u32 pdo = src_pdo[i];
 766
 767                 if (pdo_type(pdo) == PDO_TYPE_FIXED &&
 768                     pdo_fixed_voltage(pdo) == 5000) {
 769                         unsigned int curr = pdo_max_current(pdo);
 770
 771                         if (curr >= 3000)
 772                                 return TYPEC_CC_RP_3_0;
 773                         else if (curr >= 1500)
 774                                 return TYPEC_CC_RP_1_5;
 775                         return TYPEC_CC_RP_DEF;
 776                 }
 777         }
 778
 779         return TYPEC_CC_RP_DEF;
 780 }
 781
 782 static int tcpm_set_attached_state(struct tcpm_port *port, bool attached)
 783 {
 784         return port->tcpc->set_roles(port->tcpc, attached, port->pwr_role,
 785                                      port->data_role);
 786 }
 787
 788 static int tcpm_set_roles(struct tcpm_port *port, bool attached,
 789                           enum typec_role role, enum typec_data_role data)
 790 {
 791         enum typec_orientation orientation;
 792         enum usb_role usb_role;
 793         int ret;
 794
 795         if (port->polarity == TYPEC_POLARITY_CC1)
 796                 orientation = TYPEC_ORIENTATION_NORMAL;
 797         else
 798                 orientation = TYPEC_ORIENTATION_REVERSE;
 799
 800         if (data == TYPEC_HOST)
 801                 usb_role = USB_ROLE_HOST;
 802         else
 803                 usb_role = USB_ROLE_DEVICE;
 804
 805         ret = tcpm_mux_set(port, TYPEC_STATE_USB, usb_role, orientation);
 806         if (ret < 0)
 807                 return ret;
 808
 809         ret = port->tcpc->set_roles(port->tcpc, attached, role, data);
 810         if (ret < 0)
 811                 return ret;
 812
 813         port->pwr_role = role;
 814         port->data_role = data;
 815         typec_set_data_role(port->typec_port, data);
 816         typec_set_pwr_role(port->typec_port, role);
 817
 818         return 0;
 819 }
 820
 821 static int tcpm_set_pwr_role(struct tcpm_port *port, enum typec_role role)
 822 {
 823         int ret;
 824
 825         ret = port->tcpc->set_roles(port->tcpc, true, role,
 826                                     port->data_role);
 827         if (ret < 0)
 828                 return ret;
 829
 830         port->pwr_role = role;
 831         typec_set_pwr_role(port->typec_port, role);
 832
 833         return 0;
 834 }
 835
 836 static int tcpm_pd_send_source_caps(struct tcpm_port *port)
 837 {
 838         struct pd_message msg;
 839         int i;
 840
 841         memset(&msg, 0, sizeof(msg));
 842         if (!port->nr_src_pdo) {
 843                 /* No source capabilities defined, sink only */
 844                 msg.header = PD_HEADER_LE(PD_CTRL_REJECT,
 845                                           port->pwr_role,
 846                                           port->data_role,
 847                                           port->negotiated_rev,
 848                                           port->message_id, 0);
 849         } else {
 850                 msg.header = PD_HEADER_LE(PD_DATA_SOURCE_CAP,
 851                                           port->pwr_role,
 852                                           port->data_role,
 853                                           port->negotiated_rev,
 854                                           port->message_id,
 855                                           port->nr_src_pdo);
 856         }
 857         for (i = 0; i < port->nr_src_pdo; i++)
 858                 msg.payload[i] = cpu_to_le32(port->src_pdo[i]);
 859
 860         return tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
 861 }
 862
 863 static int tcpm_pd_send_sink_caps(struct tcpm_port *port)
 864 {
 865         struct pd_message msg;
 866         int i;
 867
 868         memset(&msg, 0, sizeof(msg));
 869         if (!port->nr_snk_pdo) {
 870                 /* No sink capabilities defined, source only */
 871                 msg.header = PD_HEADER_LE(PD_CTRL_REJECT,
 872                                           port->pwr_role,
 873                                           port->data_role,
 874                                           port->negotiated_rev,
 875                                           port->message_id, 0);
 876         } else {
 877                 msg.header = PD_HEADER_LE(PD_DATA_SINK_CAP,
 878                                           port->pwr_role,
 879                                           port->data_role,
 880                                           port->negotiated_rev,
 881                                           port->message_id,
 882                                           port->nr_snk_pdo);
 883         }
 884         for (i = 0; i < port->nr_snk_pdo; i++)
 885                 msg.payload[i] = cpu_to_le32(port->snk_pdo[i]);
 886
 887         return tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
 888 }
 889
 890 static void tcpm_set_state(struct tcpm_port *port, enum tcpm_state state,
 891                            unsigned int delay_ms)
 892 {
 893         if (delay_ms) {
 894                 tcpm_log(port, "pending state change %s -> %s @ %u ms",
 895                          tcpm_states[port->state], tcpm_states[state],
 896                          delay_ms);
 897                 port->delayed_state = state;
 898                 mod_delayed_work(port->wq, &port->state_machine,
 899                                  msecs_to_jiffies(delay_ms));
 900                 port->delayed_runtime = jiffies + msecs_to_jiffies(delay_ms);
 901                 port->delay_ms = delay_ms;
 902         } else {
 903                 tcpm_log(port, "state change %s -> %s",
 904                          tcpm_states[port->state], tcpm_states[state]);
 905                 port->delayed_state = INVALID_STATE;
 906                 port->prev_state = port->state;
 907                 port->state = state;
 908                 /*
 909                  * Don't re-queue the state machine work item if we're currently
 910                  * in the state machine and we're immediately changing states.
 911                  * tcpm_state_machine_work() will continue running the state
 912                  * machine.
 913                  */
 914                 if (!port->state_machine_running)
 915                         mod_delayed_work(port->wq, &port->state_machine, 0);
 916         }
 917 }
 918
 919 static void tcpm_set_state_cond(struct tcpm_port *port, enum tcpm_state state,
 920                                 unsigned int delay_ms)
 921 {
 922         if (port->enter_state == port->state)
 923                 tcpm_set_state(port, state, delay_ms);
 924         else
 925                 tcpm_log(port,
 926                          "skipped %sstate change %s -> %s [%u ms], context state %s",
 927                          delay_ms ? "delayed " : "",
 928                          tcpm_states[port->state], tcpm_states[state],
 929                          delay_ms, tcpm_states[port->enter_state]);
 930 }
 931
 932 static void tcpm_queue_message(struct tcpm_port *port,
 933                                enum pd_msg_request message)
 934 {
 935         port->queued_message = message;
 936         mod_delayed_work(port->wq, &port->state_machine, 0);
 937 }
 938
 939 /*
 940  * VDM/VDO handling functions
 941  */
 942 static void tcpm_queue_vdm(struct tcpm_port *port, const u32 header,
 943                            const u32 *data, int cnt)
 944 {
 945         port->vdo_count = cnt + 1;
 946         port->vdo_data[0] = header;
 947         memcpy(&port->vdo_data[1], data, sizeof(u32) * cnt);
 948         /* Set ready, vdm state machine will actually send */
 949         port->vdm_retries = 0;
 950         port->vdm_state = VDM_STATE_READY;
 951 }
 952
 953 static void svdm_consume_identity(struct tcpm_port *port, const __le32 *payload,
 954                                   int cnt)
 955 {
 956         u32 vdo = le32_to_cpu(payload[VDO_INDEX_IDH]);
 957         u32 product = le32_to_cpu(payload[VDO_INDEX_PRODUCT]);
 958
 959         memset(&port->mode_data, 0, sizeof(port->mode_data));
 960
 961         port->partner_ident.id_header = vdo;
 962         port->partner_ident.cert_stat = le32_to_cpu(payload[VDO_INDEX_CSTAT]);
 963         port->partner_ident.product = product;
 964
 965         typec_partner_set_identity(port->partner);
 966
 967         tcpm_log(port, "Identity: %04x:%04x.%04x",
 968                  PD_IDH_VID(vdo),
 969                  PD_PRODUCT_PID(product), product & 0xffff);
 970 }
 971
 972 static bool svdm_consume_svids(struct tcpm_port *port, const __le32 *payload,
 973                                int cnt)
 974 {
 975         struct pd_mode_data *pmdata = &port->mode_data;
 976         int i;
 977
 978         for (i = 1; i < cnt; i++) {
 979                 u32 p = le32_to_cpu(payload[i]);
 980                 u16 svid;
 981
 982                 svid = (p >> 16) & 0xffff;
 983                 if (!svid)
 984                         return false;
 985
 986                 if (pmdata->nsvids >= SVID_DISCOVERY_MAX)
 987                         goto abort;
 988
 989                 pmdata->svids[pmdata->nsvids++] = svid;
 990                 tcpm_log(port, "SVID %d: 0x%x", pmdata->nsvids, svid);
 991
 992                 svid = p & 0xffff;
 993                 if (!svid)
 994                         return false;
 995
 996                 if (pmdata->nsvids >= SVID_DISCOVERY_MAX)
 997                         goto abort;
 998
 999                 pmdata->svids[pmdata->nsvids++] = svid;
1000                 tcpm_log(port, "SVID %d: 0x%x", pmdata->nsvids, svid);
1001         }
1002         return true;
1003 abort:
1004         tcpm_log(port, "SVID_DISCOVERY_MAX(%d) too low!", SVID_DISCOVERY_MAX);
1005         return false;
1006 }
1007
1008 static void svdm_consume_modes(struct tcpm_port *port, const __le32 *payload,
1009                                int cnt)
1010 {
1011         struct pd_mode_data *pmdata = &port->mode_data;
1012         struct typec_altmode_desc *paltmode;
1013         int i;
1014
1015         if (pmdata->altmodes >= ARRAY_SIZE(port->partner_altmode)) {
1016                 /* Already logged in svdm_consume_svids() */
1017                 return;
1018         }
1019
1020         for (i = 1; i < cnt; i++) {
1021                 paltmode = &pmdata->altmode_desc[pmdata->altmodes];
1022                 memset(paltmode, 0, sizeof(*paltmode));
1023
1024                 paltmode->svid = pmdata->svids[pmdata->svid_index];
1025                 paltmode->mode = i;
1026                 paltmode->vdo = le32_to_cpu(payload[i]);
1027
1028                 tcpm_log(port, " Alternate mode %d: SVID 0x%04x, VDO %d: 0x%08x",
1029                          pmdata->altmodes, paltmode->svid,
1030                          paltmode->mode, paltmode->vdo);
1031
1032                 pmdata->altmodes++;
1033         }
1034 }
1035
1036 static void tcpm_register_partner_altmodes(struct tcpm_port *port)
1037 {
1038         struct pd_mode_data *modep = &port->mode_data;
1039         struct typec_altmode *altmode;
1040         int i;
1041
1042         for (i = 0; i < modep->altmodes; i++) {
1043                 altmode = typec_partner_register_altmode(port->partner,
1044                                                 &modep->altmode_desc[i]);
1045                 if (!altmode)
1046                         tcpm_log(port, "Failed to register partner SVID 0x%04x",
1047                                  modep->altmode_desc[i].svid);
1048                 port->partner_altmode[i] = altmode;
1049         }
1050 }
1051
1052 #define supports_modal(port)    PD_IDH_MODAL_SUPP((port)->partner_ident.id_header)
1053
1054 static int tcpm_pd_svdm(struct tcpm_port *port, const __le32 *payload, int cnt,
1055                         u32 *response)
1056 {
1057         struct typec_altmode *adev;
1058         struct typec_altmode *pdev;
1059         struct pd_mode_data *modep;
1060         u32 p[PD_MAX_PAYLOAD];
1061         int rlen = 0;
1062         int cmd_type;
1063         int cmd;
1064         int i;
1065
1066         for (i = 0; i < cnt; i++)
1067                 p[i] = le32_to_cpu(payload[i]);
1068
1069         cmd_type = PD_VDO_CMDT(p[0]);
1070         cmd = PD_VDO_CMD(p[0]);
1071
1072         tcpm_log(port, "Rx VDM cmd 0x%x type %d cmd %d len %d",
1073                  p[0], cmd_type, cmd, cnt);
1074
1075         modep = &port->mode_data;
1076
1077         adev = typec_match_altmode(port->port_altmode, ALTMODE_DISCOVERY_MAX,
1078                                    PD_VDO_VID(p[0]), PD_VDO_OPOS(p[0]));
1079
1080         pdev = typec_match_altmode(port->partner_altmode, ALTMODE_DISCOVERY_MAX,
1081                                    PD_VDO_VID(p[0]), PD_VDO_OPOS(p[0]));
1082
1083         switch (cmd_type) {
1084         case CMDT_INIT:
1085                 switch (cmd) {
1086                 case CMD_DISCOVER_IDENT:
1087                         /* 6.4.4.3.1: Only respond as UFP (device) */
1088                         if (port->data_role == TYPEC_DEVICE &&
1089                             port->nr_snk_vdo) {
1090                                 for (i = 0; i <  port->nr_snk_vdo; i++)
1091                                         response[i + 1] = port->snk_vdo[i];
1092                                 rlen = port->nr_snk_vdo + 1;
1093                         }
1094                         break;
1095                 case CMD_DISCOVER_SVID:
1096                         break;
1097                 case CMD_DISCOVER_MODES:
1098                         break;
1099                 case CMD_ENTER_MODE:
1100                         break;
1101                 case CMD_EXIT_MODE:
1102                         break;
1103                 case CMD_ATTENTION:
1104                         /* Attention command does not have response */
1105                         if (adev)
1106                                 typec_altmode_attention(adev, p[1]);
1107                         return 0;
1108                 default:
1109                         break;
1110                 }
1111                 if (rlen >= 1) {
1112                         response[0] = p[0] | VDO_CMDT(CMDT_RSP_ACK);
1113                 } else if (rlen == 0) {
1114                         response[0] = p[0] | VDO_CMDT(CMDT_RSP_NAK);
1115                         rlen = 1;
1116                 } else {
1117                         response[0] = p[0] | VDO_CMDT(CMDT_RSP_BUSY);
1118                         rlen = 1;
1119                 }
1120                 break;
1121         case CMDT_RSP_ACK:
1122                 /* silently drop message if we are not connected */
1123                 if (IS_ERR_OR_NULL(port->partner))
1124                         break;
1125
1126                 switch (cmd) {
1127                 case CMD_DISCOVER_IDENT:
1128                         /* 6.4.4.3.1 */
1129                         svdm_consume_identity(port, payload, cnt);
1130                         response[0] = VDO(USB_SID_PD, 1, CMD_DISCOVER_SVID);
1131                         rlen = 1;
1132                         break;
1133                 case CMD_DISCOVER_SVID:
1134                         /* 6.4.4.3.2 */
1135                         if (svdm_consume_svids(port, payload, cnt)) {
1136                                 response[0] = VDO(USB_SID_PD, 1,
1137                                                   CMD_DISCOVER_SVID);
1138                                 rlen = 1;
1139                         } else if (modep->nsvids && supports_modal(port)) {
1140                                 response[0] = VDO(modep->svids[0], 1,
1141                                                   CMD_DISCOVER_MODES);
1142                                 rlen = 1;
1143                         }
1144                         break;
1145                 case CMD_DISCOVER_MODES:
1146                         /* 6.4.4.3.3 */
1147                         svdm_consume_modes(port, payload, cnt);
1148                         modep->svid_index++;
1149                         if (modep->svid_index < modep->nsvids) {
1150                                 u16 svid = modep->svids[modep->svid_index];
1151                                 response[0] = VDO(svid, 1, CMD_DISCOVER_MODES);
1152                                 rlen = 1;
1153                         } else {
1154                                 tcpm_register_partner_altmodes(port);
1155                         }
1156                         break;
1157                 case CMD_ENTER_MODE:
1158                         if (adev && pdev) {
1159                                 typec_altmode_update_active(pdev, true);
1160
1161                                 if (typec_altmode_vdm(adev, p[0], &p[1], cnt)) {
1162                                         response[0] = VDO(adev->svid, 1,
1163                                                           CMD_EXIT_MODE);
1164                                         response[0] |= VDO_OPOS(adev->mode);
1165                                         return 1;
1166                                 }
1167                         }
1168                         return 0;
1169                 case CMD_EXIT_MODE:
1170                         if (adev && pdev) {
1171                                 typec_altmode_update_active(pdev, false);
1172
1173                                 /* Back to USB Operation */
1174                                 WARN_ON(typec_altmode_notify(adev,
1175                                                              TYPEC_STATE_USB,
1176                                                              NULL));
1177                         }
1178                         break;
1179                 default:
1180                         break;
1181                 }
1182                 break;
1183         case CMDT_RSP_NAK:
1184                 switch (cmd) {
1185                 case CMD_ENTER_MODE:
1186                         /* Back to USB Operation */
1187                         if (adev)
1188                                 WARN_ON(typec_altmode_notify(adev,
1189                                                              TYPEC_STATE_USB,
1190                                                              NULL));
1191                         break;
1192                 default:
1193                         break;
1194                 }
1195                 break;
1196         default:
1197                 break;
1198         }
1199
1200         /* Informing the alternate mode drivers about everything */
1201         if (adev)
1202                 typec_altmode_vdm(adev, p[0], &p[1], cnt);
1203
1204         return rlen;
1205 }
1206
1207 static void tcpm_handle_vdm_request(struct tcpm_port *port,
1208                                     const __le32 *payload, int cnt)
1209 {
1210         int rlen = 0;
1211         u32 response[8] = { };
1212         u32 p0 = le32_to_cpu(payload[0]);
1213
1214         if (port->vdm_state == VDM_STATE_BUSY) {
1215                 /* If UFP responded busy retry after timeout */
1216                 if (PD_VDO_CMDT(p0) == CMDT_RSP_BUSY) {
1217                         port->vdm_state = VDM_STATE_WAIT_RSP_BUSY;
1218                         port->vdo_retry = (p0 & ~VDO_CMDT_MASK) |
1219                                 CMDT_INIT;
1220                         mod_delayed_work(port->wq, &port->vdm_state_machine,
1221                                          msecs_to_jiffies(PD_T_VDM_BUSY));
1222                         return;
1223                 }
1224                 port->vdm_state = VDM_STATE_DONE;
1225         }
1226
1227         if (PD_VDO_SVDM(p0))
1228                 rlen = tcpm_pd_svdm(port, payload, cnt, response);
1229
1230         if (rlen > 0) {
1231                 tcpm_queue_vdm(port, response[0], &response[1], rlen - 1);
1232                 mod_delayed_work(port->wq, &port->vdm_state_machine, 0);
1233         }
1234 }
1235
1236 static void tcpm_send_vdm(struct tcpm_port *port, u32 vid, int cmd,
1237                           const u32 *data, int count)
1238 {
1239         u32 header;
1240
1241         if (WARN_ON(count > VDO_MAX_SIZE - 1))
1242                 count = VDO_MAX_SIZE - 1;
1243
1244         /* set VDM header with VID & CMD */
1245         header = VDO(vid, ((vid & USB_SID_PD) == USB_SID_PD) ?
1246                         1 : (PD_VDO_CMD(cmd) <= CMD_ATTENTION), cmd);
1247         tcpm_queue_vdm(port, header, data, count);
1248
1249         mod_delayed_work(port->wq, &port->vdm_state_machine, 0);
1250 }
1251
1252 static unsigned int vdm_ready_timeout(u32 vdm_hdr)
1253 {
1254         unsigned int timeout;
1255         int cmd = PD_VDO_CMD(vdm_hdr);
1256
1257         /* its not a structured VDM command */
1258         if (!PD_VDO_SVDM(vdm_hdr))
1259                 return PD_T_VDM_UNSTRUCTURED;
1260
1261         switch (PD_VDO_CMDT(vdm_hdr)) {
1262         case CMDT_INIT:
1263                 if (cmd == CMD_ENTER_MODE || cmd == CMD_EXIT_MODE)
1264                         timeout = PD_T_VDM_WAIT_MODE_E;
1265                 else
1266                         timeout = PD_T_VDM_SNDR_RSP;
1267                 break;
1268         default:
1269                 if (cmd == CMD_ENTER_MODE || cmd == CMD_EXIT_MODE)
1270                         timeout = PD_T_VDM_E_MODE;
1271                 else
1272                         timeout = PD_T_VDM_RCVR_RSP;
1273                 break;
1274         }
1275         return timeout;
1276 }
1277
1278 static void vdm_run_state_machine(struct tcpm_port *port)
1279 {
1280         struct pd_message msg;
1281         int i, res;
1282
1283         switch (port->vdm_state) {
1284         case VDM_STATE_READY:
1285                 /* Only transmit VDM if attached */
1286                 if (!port->attached) {
1287                         port->vdm_state = VDM_STATE_ERR_BUSY;
1288                         break;
1289                 }
1290
1291                 /*
1292                  * if there's traffic or we're not in PDO ready state don't send
1293                  * a VDM.
1294                  */
1295                 if (port->state != SRC_READY && port->state != SNK_READY)
1296                         break;
1297
1298                 /* Prepare and send VDM */
1299                 memset(&msg, 0, sizeof(msg));
1300                 msg.header = PD_HEADER_LE(PD_DATA_VENDOR_DEF,
1301                                           port->pwr_role,
1302                                           port->data_role,
1303                                           port->negotiated_rev,
1304                                           port->message_id, port->vdo_count);
1305                 for (i = 0; i < port->vdo_count; i++)
1306                         msg.payload[i] = cpu_to_le32(port->vdo_data[i]);
1307                 res = tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
1308                 if (res < 0) {
1309                         port->vdm_state = VDM_STATE_ERR_SEND;
1310                 } else {
1311                         unsigned long timeout;
1312
1313                         port->vdm_retries = 0;
1314                         port->vdm_state = VDM_STATE_BUSY;
1315                         timeout = vdm_ready_timeout(port->vdo_data[0]);
1316                         mod_delayed_work(port->wq, &port->vdm_state_machine,
1317                                          timeout);
1318                 }
1319                 break;
1320         case VDM_STATE_WAIT_RSP_BUSY:
1321                 port->vdo_data[0] = port->vdo_retry;
1322                 port->vdo_count = 1;
1323                 port->vdm_state = VDM_STATE_READY;
1324                 break;
1325         case VDM_STATE_BUSY:
1326                 port->vdm_state = VDM_STATE_ERR_TMOUT;
1327                 break;
1328         case VDM_STATE_ERR_SEND:
1329                 /*
1330                  * A partner which does not support USB PD will not reply,
1331                  * so this is not a fatal error. At the same time, some
1332                  * devices may not return GoodCRC under some circumstances,
1333                  * so we need to retry.
1334                  */
1335                 if (port->vdm_retries < 3) {
1336                         tcpm_log(port, "VDM Tx error, retry");
1337                         port->vdm_retries++;
1338                         port->vdm_state = VDM_STATE_READY;
1339                 }
1340                 break;
1341         default:
1342                 break;
1343         }
1344 }
1345
1346 static void vdm_state_machine_work(struct work_struct *work)
1347 {
1348         struct tcpm_port *port = container_of(work, struct tcpm_port,
1349                                               vdm_state_machine.work);
1350         enum vdm_states prev_state;
1351
1352         mutex_lock(&port->lock);
1353
1354         /*
1355          * Continue running as long as the port is not busy and there was
1356          * a state change.
1357          */
1358         do {
1359                 prev_state = port->vdm_state;
1360                 vdm_run_state_machine(port);
1361         } while (port->vdm_state != prev_state &&
1362                  port->vdm_state != VDM_STATE_BUSY);
1363
1364         mutex_unlock(&port->lock);
1365 }
1366
1367 enum pdo_err {
1368         PDO_NO_ERR,
1369         PDO_ERR_NO_VSAFE5V,
1370         PDO_ERR_VSAFE5V_NOT_FIRST,
1371         PDO_ERR_PDO_TYPE_NOT_IN_ORDER,
1372         PDO_ERR_FIXED_NOT_SORTED,
1373         PDO_ERR_VARIABLE_BATT_NOT_SORTED,
1374         PDO_ERR_DUPE_PDO,
1375         PDO_ERR_PPS_APDO_NOT_SORTED,
1376         PDO_ERR_DUPE_PPS_APDO,
1377 };
1378
1379 static const char * const pdo_err_msg[] = {
1380         [PDO_ERR_NO_VSAFE5V] =
1381         " err: source/sink caps should atleast have vSafe5V",
1382         [PDO_ERR_VSAFE5V_NOT_FIRST] =
1383         " err: vSafe5V Fixed Supply Object Shall always be the first object",
1384         [PDO_ERR_PDO_TYPE_NOT_IN_ORDER] =
1385         " err: PDOs should be in the following order: Fixed; Battery; Variable",
1386         [PDO_ERR_FIXED_NOT_SORTED] =
1387         " err: Fixed supply pdos should be in increasing order of their fixed voltage",
1388         [PDO_ERR_VARIABLE_BATT_NOT_SORTED] =
1389         " err: Variable/Battery supply pdos should be in increasing order of their minimum voltage",
1390         [PDO_ERR_DUPE_PDO] =
1391         " err: Variable/Batt supply pdos cannot have same min/max voltage",
1392         [PDO_ERR_PPS_APDO_NOT_SORTED] =
1393         " err: Programmable power supply apdos should be in increasing order of their maximum voltage",
1394         [PDO_ERR_DUPE_PPS_APDO] =
1395         " err: Programmable power supply apdos cannot have same min/max voltage and max current",
1396 };
1397
1398 static enum pdo_err tcpm_caps_err(struct tcpm_port *port, const u32 *pdo,
1399                                   unsigned int nr_pdo)
1400 {
1401         unsigned int i;
1402
1403         /* Should at least contain vSafe5v */
1404         if (nr_pdo < 1)
1405                 return PDO_ERR_NO_VSAFE5V;
1406
1407         /* The vSafe5V Fixed Supply Object Shall always be the first object */
1408         if (pdo_type(pdo[0]) != PDO_TYPE_FIXED ||
1409             pdo_fixed_voltage(pdo[0]) != VSAFE5V)
1410                 return PDO_ERR_VSAFE5V_NOT_FIRST;
1411
1412         for (i = 1; i < nr_pdo; i++) {
1413                 if (pdo_type(pdo[i]) < pdo_type(pdo[i - 1])) {
1414                         return PDO_ERR_PDO_TYPE_NOT_IN_ORDER;
1415                 } else if (pdo_type(pdo[i]) == pdo_type(pdo[i - 1])) {
1416                         enum pd_pdo_type type = pdo_type(pdo[i]);
1417
1418                         switch (type) {
1419                         /*
1420                          * The remaining Fixed Supply Objects, if
1421                          * present, shall be sent in voltage order;
1422                          * lowest to highest.
1423                          */
1424                         case PDO_TYPE_FIXED:
1425                                 if (pdo_fixed_voltage(pdo[i]) <=
1426                                     pdo_fixed_voltage(pdo[i - 1]))
1427                                         return PDO_ERR_FIXED_NOT_SORTED;
1428                                 break;
1429                         /*
1430                          * The Battery Supply Objects and Variable
1431                          * supply, if present shall be sent in Minimum
1432                          * Voltage order; lowest to highest.
1433                          */
1434                         case PDO_TYPE_VAR:
1435                         case PDO_TYPE_BATT:
1436                                 if (pdo_min_voltage(pdo[i]) <
1437                                     pdo_min_voltage(pdo[i - 1]))
1438                                         return PDO_ERR_VARIABLE_BATT_NOT_SORTED;
1439                                 else if ((pdo_min_voltage(pdo[i]) ==
1440                                           pdo_min_voltage(pdo[i - 1])) &&
1441                                          (pdo_max_voltage(pdo[i]) ==
1442                                           pdo_max_voltage(pdo[i - 1])))
1443                                         return PDO_ERR_DUPE_PDO;
1444                                 break;
1445                         /*
1446                          * The Programmable Power Supply APDOs, if present,
1447                          * shall be sent in Maximum Voltage order;
1448                          * lowest to highest.
1449                          */
1450                         case PDO_TYPE_APDO:
1451                                 if (pdo_apdo_type(pdo[i]) != APDO_TYPE_PPS)
1452                                         break;
1453
1454                                 if (pdo_pps_apdo_max_voltage(pdo[i]) <
1455                                     pdo_pps_apdo_max_voltage(pdo[i - 1]))
1456                                         return PDO_ERR_PPS_APDO_NOT_SORTED;
1457                                 else if (pdo_pps_apdo_min_voltage(pdo[i]) ==
1458                                           pdo_pps_apdo_min_voltage(pdo[i - 1]) &&
1459                                          pdo_pps_apdo_max_voltage(pdo[i]) ==
1460                                           pdo_pps_apdo_max_voltage(pdo[i - 1]) &&
1461                                          pdo_pps_apdo_max_current(pdo[i]) ==
1462                                           pdo_pps_apdo_max_current(pdo[i - 1]))
1463                                         return PDO_ERR_DUPE_PPS_APDO;
1464                                 break;
1465                         default:
1466                                 tcpm_log_force(port, " Unknown pdo type");
1467                         }
1468                 }
1469         }
1470
1471         return PDO_NO_ERR;
1472 }
1473
1474 static int tcpm_validate_caps(struct tcpm_port *port, const u32 *pdo,
1475                               unsigned int nr_pdo)
1476 {
1477         enum pdo_err err_index = tcpm_caps_err(port, pdo, nr_pdo);
1478
1479         if (err_index != PDO_NO_ERR) {
1480                 tcpm_log_force(port, " %s", pdo_err_msg[err_index]);
1481                 return -EINVAL;
1482         }
1483
1484         return 0;
1485 }
1486
1487 static int tcpm_altmode_enter(struct typec_altmode *altmode)
1488 {
1489         struct tcpm_port *port = typec_altmode_get_drvdata(altmode);
1490         u32 header;
1491
1492         mutex_lock(&port->lock);
1493         header = VDO(altmode->svid, 1, CMD_ENTER_MODE);
1494         header |= VDO_OPOS(altmode->mode);
1495
1496         tcpm_queue_vdm(port, header, NULL, 0);
1497         mod_delayed_work(port->wq, &port->vdm_state_machine, 0);
1498         mutex_unlock(&port->lock);
1499
1500         return 0;
1501 }
1502
1503 static int tcpm_altmode_exit(struct typec_altmode *altmode)
1504 {
1505         struct tcpm_port *port = typec_altmode_get_drvdata(altmode);
1506         u32 header;
1507
1508         mutex_lock(&port->lock);
1509         header = VDO(altmode->svid, 1, CMD_EXIT_MODE);
1510         header |= VDO_OPOS(altmode->mode);
1511
1512         tcpm_queue_vdm(port, header, NULL, 0);
1513         mod_delayed_work(port->wq, &port->vdm_state_machine, 0);
1514         mutex_unlock(&port->lock);
1515
1516         return 0;
1517 }
1518
1519 static int tcpm_altmode_vdm(struct typec_altmode *altmode,
1520                             u32 header, const u32 *data, int count)
1521 {
1522         struct tcpm_port *port = typec_altmode_get_drvdata(altmode);
1523
1524         mutex_lock(&port->lock);
1525         tcpm_queue_vdm(port, header, data, count - 1);
1526         mod_delayed_work(port->wq, &port->vdm_state_machine, 0);
1527         mutex_unlock(&port->lock);
1528
1529         return 0;
1530 }
1531
1532 static const struct typec_altmode_ops tcpm_altmode_ops = {
1533         .enter = tcpm_altmode_enter,
1534         .exit = tcpm_altmode_exit,
1535         .vdm = tcpm_altmode_vdm,
1536 };
1537
1538 /*
1539  * PD (data, control) command handling functions
1540  */
1541 static inline enum tcpm_state ready_state(struct tcpm_port *port)
1542 {
1543         if (port->pwr_role == TYPEC_SOURCE)
1544                 return SRC_READY;
1545         else
1546                 return SNK_READY;
1547 }
1548
1549 static int tcpm_pd_send_control(struct tcpm_port *port,
1550                                 enum pd_ctrl_msg_type type);
1551
1552 static void tcpm_handle_alert(struct tcpm_port *port, const __le32 *payload,
1553                               int cnt)
1554 {
1555         u32 p0 = le32_to_cpu(payload[0]);
1556         unsigned int type = usb_pd_ado_type(p0);
1557
1558         if (!type) {
1559                 tcpm_log(port, "Alert message received with no type");
1560                 return;
1561         }
1562
1563         /* Just handling non-battery alerts for now */
1564         if (!(type & USB_PD_ADO_TYPE_BATT_STATUS_CHANGE)) {
1565                 switch (port->state) {
1566                 case SRC_READY:
1567                 case SNK_READY:
1568                         tcpm_set_state(port, GET_STATUS_SEND, 0);
1569                         break;
1570                 default:
1571                         tcpm_queue_message(port, PD_MSG_CTRL_WAIT);
1572                         break;
1573                 }
1574         }
1575 }
1576
1577 static void tcpm_pd_data_request(struct tcpm_port *port,
1578                                  const struct pd_message *msg)
1579 {
1580         enum pd_data_msg_type type = pd_header_type_le(msg->header);
1581         unsigned int cnt = pd_header_cnt_le(msg->header);
1582         unsigned int rev = pd_header_rev_le(msg->header);
1583         unsigned int i;
1584
1585         switch (type) {
1586         case PD_DATA_SOURCE_CAP:
1587                 if (port->pwr_role != TYPEC_SINK)
1588                         break;
1589
1590                 for (i = 0; i < cnt; i++)
1591                         port->source_caps[i] = le32_to_cpu(msg->payload[i]);
1592
1593                 port->nr_source_caps = cnt;
1594
1595                 tcpm_log_source_caps(port);
1596
1597                 tcpm_validate_caps(port, port->source_caps,
1598                                    port->nr_source_caps);
1599
1600                 /*
1601                  * Adjust revision in subsequent message headers, as required,
1602                  * to comply with 6.2.1.1.5 of the USB PD 3.0 spec. We don't
1603                  * support Rev 1.0 so just do nothing in that scenario.
1604                  */
1605                 if (rev == PD_REV10)
1606                         break;
1607
1608                 if (rev < PD_MAX_REV)
1609                         port->negotiated_rev = rev;
1610
1611                 /*
1612                  * This message may be received even if VBUS is not
1613                  * present. This is quite unexpected; see USB PD
1614                  * specification, sections 8.3.3.6.3.1 and 8.3.3.6.3.2.
1615                  * However, at the same time, we must be ready to
1616                  * receive this message and respond to it 15ms after
1617                  * receiving PS_RDY during power swap operations, no matter
1618                  * if VBUS is available or not (USB PD specification,
1619                  * section 6.5.9.2).
1620                  * So we need to accept the message either way,
1621                  * but be prepared to keep waiting for VBUS after it was
1622                  * handled.
1623                  */
1624                 tcpm_set_state(port, SNK_NEGOTIATE_CAPABILITIES, 0);
1625                 break;
1626         case PD_DATA_REQUEST:
1627                 if (port->pwr_role != TYPEC_SOURCE ||
1628                     cnt != 1) {
1629                         tcpm_queue_message(port, PD_MSG_CTRL_REJECT);
1630                         break;
1631                 }
1632
1633                 /*
1634                  * Adjust revision in subsequent message headers, as required,
1635                  * to comply with 6.2.1.1.5 of the USB PD 3.0 spec. We don't
1636                  * support Rev 1.0 so just reject in that scenario.
1637                  */
1638                 if (rev == PD_REV10) {
1639                         tcpm_queue_message(port, PD_MSG_CTRL_REJECT);
1640                         break;
1641                 }
1642
1643                 if (rev < PD_MAX_REV)
1644                         port->negotiated_rev = rev;
1645
1646                 port->sink_request = le32_to_cpu(msg->payload[0]);
1647                 tcpm_set_state(port, SRC_NEGOTIATE_CAPABILITIES, 0);
1648                 break;
1649         case PD_DATA_SINK_CAP:
1650                 /* We don't do anything with this at the moment... */
1651                 for (i = 0; i < cnt; i++)
1652                         port->sink_caps[i] = le32_to_cpu(msg->payload[i]);
1653                 port->nr_sink_caps = cnt;
1654                 break;
1655         case PD_DATA_VENDOR_DEF:
1656                 tcpm_handle_vdm_request(port, msg->payload, cnt);
1657                 break;
1658         case PD_DATA_BIST:
1659                 if (port->state == SRC_READY || port->state == SNK_READY) {
1660                         port->bist_request = le32_to_cpu(msg->payload[0]);
1661                         tcpm_set_state(port, BIST_RX, 0);
1662                 }
1663                 break;
1664         case PD_DATA_ALERT:
1665                 tcpm_handle_alert(port, msg->payload, cnt);
1666                 break;
1667         case PD_DATA_BATT_STATUS:
1668         case PD_DATA_GET_COUNTRY_INFO:
1669                 /* Currently unsupported */
1670                 tcpm_queue_message(port, PD_MSG_CTRL_NOT_SUPP);
1671                 break;
1672         default:
1673                 tcpm_log(port, "Unhandled data message type %#x", type);
1674                 break;
1675         }
1676 }
1677
1678 static void tcpm_pps_complete(struct tcpm_port *port, int result)
1679 {
1680         if (port->pps_pending) {
1681                 port->pps_status = result;
1682                 port->pps_pending = false;
1683                 complete(&port->pps_complete);
1684         }
1685 }
1686
1687 static void tcpm_pd_ctrl_request(struct tcpm_port *port,
1688                                  const struct pd_message *msg)
1689 {
1690         enum pd_ctrl_msg_type type = pd_header_type_le(msg->header);
1691         enum tcpm_state next_state;
1692
1693         switch (type) {
1694         case PD_CTRL_GOOD_CRC:
1695         case PD_CTRL_PING:
1696                 break;
1697         case PD_CTRL_GET_SOURCE_CAP:
1698                 switch (port->state) {
1699                 case SRC_READY:
1700                 case SNK_READY:
1701                         tcpm_queue_message(port, PD_MSG_DATA_SOURCE_CAP);
1702                         break;
1703                 default:
1704                         tcpm_queue_message(port, PD_MSG_CTRL_REJECT);
1705                         break;
1706                 }
1707                 break;
1708         case PD_CTRL_GET_SINK_CAP:
1709                 switch (port->state) {
1710                 case SRC_READY:
1711                 case SNK_READY:
1712                         tcpm_queue_message(port, PD_MSG_DATA_SINK_CAP);
1713                         break;
1714                 default:
1715                         tcpm_queue_message(port, PD_MSG_CTRL_REJECT);
1716                         break;
1717                 }
1718                 break;
1719         case PD_CTRL_GOTO_MIN:
1720                 break;
1721         case PD_CTRL_PS_RDY:
1722                 switch (port->state) {
1723                 case SNK_TRANSITION_SINK:
1724                         if (port->vbus_present) {
1725                                 tcpm_set_current_limit(port,
1726                                                        port->current_limit,
1727                                                        port->supply_voltage);
1728                                 port->explicit_contract = true;
1729                                 tcpm_set_state(port, SNK_READY, 0);
1730                         } else {
1731                                 /*
1732                                  * Seen after power swap. Keep waiting for VBUS
1733                                  * in a transitional state.
1734                                  */
1735                                 tcpm_set_state(port,
1736                                                SNK_TRANSITION_SINK_VBUS, 0);
1737                         }
1738                         break;
1739                 case PR_SWAP_SRC_SNK_SOURCE_OFF_CC_DEBOUNCED:
1740                         tcpm_set_state(port, PR_SWAP_SRC_SNK_SINK_ON, 0);
1741                         break;
1742                 case PR_SWAP_SNK_SRC_SINK_OFF:
1743                         tcpm_set_state(port, PR_SWAP_SNK_SRC_SOURCE_ON, 0);
1744                         break;
1745                 case VCONN_SWAP_WAIT_FOR_VCONN:
1746                         tcpm_set_state(port, VCONN_SWAP_TURN_OFF_VCONN, 0);
1747                         break;
1748                 default:
1749                         break;
1750                 }
1751                 break;
1752         case PD_CTRL_REJECT:
1753         case PD_CTRL_WAIT:
1754         case PD_CTRL_NOT_SUPP:
1755                 switch (port->state) {
1756                 case SNK_NEGOTIATE_CAPABILITIES:
1757                         /* USB PD specification, Figure 8-43 */
1758                         if (port->explicit_contract)
1759                                 next_state = SNK_READY;
1760                         else
1761                                 next_state = SNK_WAIT_CAPABILITIES;
1762                         tcpm_set_state(port, next_state, 0);
1763                         break;
1764                 case SNK_NEGOTIATE_PPS_CAPABILITIES:
1765                         /* Revert data back from any requested PPS updates */
1766                         port->pps_data.out_volt = port->supply_voltage;
1767                         port->pps_data.op_curr = port->current_limit;
1768                         port->pps_status = (type == PD_CTRL_WAIT ?
1769                                             -EAGAIN : -EOPNOTSUPP);
1770                         tcpm_set_state(port, SNK_READY, 0);
1771                         break;
1772                 case DR_SWAP_SEND:
1773                         port->swap_status = (type == PD_CTRL_WAIT ?
1774                                              -EAGAIN : -EOPNOTSUPP);
1775                         tcpm_set_state(port, DR_SWAP_CANCEL, 0);
1776                         break;
1777                 case PR_SWAP_SEND:
1778                         port->swap_status = (type == PD_CTRL_WAIT ?
1779                                              -EAGAIN : -EOPNOTSUPP);
1780                         tcpm_set_state(port, PR_SWAP_CANCEL, 0);
1781                         break;
1782                 case VCONN_SWAP_SEND:
1783                         port->swap_status = (type == PD_CTRL_WAIT ?
1784                                              -EAGAIN : -EOPNOTSUPP);
1785                         tcpm_set_state(port, VCONN_SWAP_CANCEL, 0);
1786                         break;
1787                 default:
1788                         break;
1789                 }
1790                 break;
1791         case PD_CTRL_ACCEPT:
1792                 switch (port->state) {
1793                 case SNK_NEGOTIATE_CAPABILITIES:
1794                         port->pps_data.active = false;
1795                         tcpm_set_state(port, SNK_TRANSITION_SINK, 0);
1796                         break;
1797                 case SNK_NEGOTIATE_PPS_CAPABILITIES:
1798                         port->pps_data.active = true;
1799                         port->supply_voltage = port->pps_data.out_volt;
1800                         port->current_limit = port->pps_data.op_curr;
1801                         tcpm_set_state(port, SNK_TRANSITION_SINK, 0);
1802                         break;
1803                 case SOFT_RESET_SEND:
1804                         port->message_id = 0;
1805                         port->rx_msgid = -1;
1806                         if (port->pwr_role == TYPEC_SOURCE)
1807                                 next_state = SRC_SEND_CAPABILITIES;
1808                         else
1809                                 next_state = SNK_WAIT_CAPABILITIES;
1810                         tcpm_set_state(port, next_state, 0);
1811                         break;
1812                 case DR_SWAP_SEND:
1813                         tcpm_set_state(port, DR_SWAP_CHANGE_DR, 0);
1814                         break;
1815                 case PR_SWAP_SEND:
1816                         tcpm_set_state(port, PR_SWAP_START, 0);
1817                         break;
1818                 case VCONN_SWAP_SEND:
1819                         tcpm_set_state(port, VCONN_SWAP_START, 0);
1820                         break;
1821                 default:
1822                         break;
1823                 }
1824                 break;
1825         case PD_CTRL_SOFT_RESET:
1826                 tcpm_set_state(port, SOFT_RESET, 0);
1827                 break;
1828         case PD_CTRL_DR_SWAP:
1829                 if (port->port_type != TYPEC_PORT_DRP) {
1830                         tcpm_queue_message(port, PD_MSG_CTRL_REJECT);
1831                         break;
1832                 }
1833                 /*
1834                  * XXX
1835                  * 6.3.9: If an alternate mode is active, a request to swap
1836                  * alternate modes shall trigger a port reset.
1837                  */
1838                 switch (port->state) {
1839                 case SRC_READY:
1840                 case SNK_READY:
1841                         tcpm_set_state(port, DR_SWAP_ACCEPT, 0);
1842                         break;
1843                 default:
1844                         tcpm_queue_message(port, PD_MSG_CTRL_WAIT);
1845                         break;
1846                 }
1847                 break;
1848         case PD_CTRL_PR_SWAP:
1849                 if (port->port_type != TYPEC_PORT_DRP) {
1850                         tcpm_queue_message(port, PD_MSG_CTRL_REJECT);
1851                         break;
1852                 }
1853                 switch (port->state) {
1854                 case SRC_READY:
1855                 case SNK_READY:
1856                         tcpm_set_state(port, PR_SWAP_ACCEPT, 0);
1857                         break;
1858                 default:
1859                         tcpm_queue_message(port, PD_MSG_CTRL_WAIT);
1860                         break;
1861                 }
1862                 break;
1863         case PD_CTRL_VCONN_SWAP:
1864                 switch (port->state) {
1865                 case SRC_READY:
1866                 case SNK_READY:
1867                         tcpm_set_state(port, VCONN_SWAP_ACCEPT, 0);
1868                         break;
1869                 default:
1870                         tcpm_queue_message(port, PD_MSG_CTRL_WAIT);
1871                         break;
1872                 }
1873                 break;
1874         case PD_CTRL_GET_SOURCE_CAP_EXT:
1875         case PD_CTRL_GET_STATUS:
1876         case PD_CTRL_FR_SWAP:
1877         case PD_CTRL_GET_PPS_STATUS:
1878         case PD_CTRL_GET_COUNTRY_CODES:
1879                 /* Currently not supported */
1880                 tcpm_queue_message(port, PD_MSG_CTRL_NOT_SUPP);
1881                 break;
1882         default:
1883                 tcpm_log(port, "Unhandled ctrl message type %#x", type);
1884                 break;
1885         }
1886 }
1887
1888 static void tcpm_pd_ext_msg_request(struct tcpm_port *port,
1889                                     const struct pd_message *msg)
1890 {
1891         enum pd_ext_msg_type type = pd_header_type_le(msg->header);
1892         unsigned int data_size = pd_ext_header_data_size_le(msg->ext_msg.header);
1893
1894         if (!(msg->ext_msg.header & PD_EXT_HDR_CHUNKED)) {
1895                 tcpm_log(port, "Unchunked extended messages unsupported");
1896                 return;
1897         }
1898
1899         if (data_size > PD_EXT_MAX_CHUNK_DATA) {
1900                 tcpm_log(port, "Chunk handling not yet supported");
1901                 return;
1902         }
1903
1904         switch (type) {
1905         case PD_EXT_STATUS:
1906                 /*
1907                  * If PPS related events raised then get PPS status to clear
1908                  * (see USB PD 3.0 Spec, 6.5.2.4)
1909                  */
1910                 if (msg->ext_msg.data[USB_PD_EXT_SDB_EVENT_FLAGS] &
1911                     USB_PD_EXT_SDB_PPS_EVENTS)
1912                         tcpm_set_state(port, GET_PPS_STATUS_SEND, 0);
1913                 else
1914                         tcpm_set_state(port, ready_state(port), 0);
1915                 break;
1916         case PD_EXT_PPS_STATUS:
1917                 /*
1918                  * For now the PPS status message is used to clear events
1919                  * and nothing more.
1920                  */
1921                 tcpm_set_state(port, ready_state(port), 0);
1922                 break;
1923         case PD_EXT_SOURCE_CAP_EXT:
1924         case PD_EXT_GET_BATT_CAP:
1925         case PD_EXT_GET_BATT_STATUS:
1926         case PD_EXT_BATT_CAP:
1927         case PD_EXT_GET_MANUFACTURER_INFO:
1928         case PD_EXT_MANUFACTURER_INFO:
1929         case PD_EXT_SECURITY_REQUEST:
1930         case PD_EXT_SECURITY_RESPONSE:
1931         case PD_EXT_FW_UPDATE_REQUEST:
1932         case PD_EXT_FW_UPDATE_RESPONSE:
1933         case PD_EXT_COUNTRY_INFO:
1934         case PD_EXT_COUNTRY_CODES:
1935                 tcpm_queue_message(port, PD_MSG_CTRL_NOT_SUPP);
1936                 break;
1937         default:
1938                 tcpm_log(port, "Unhandled extended message type %#x", type);
1939                 break;
1940         }
1941 }
1942
1943 static void tcpm_pd_rx_handler(struct work_struct *work)
1944 {
1945         struct pd_rx_event *event = container_of(work,
1946                                                  struct pd_rx_event, work);
1947         const struct pd_message *msg = &event->msg;
1948         unsigned int cnt = pd_header_cnt_le(msg->header);
1949         struct tcpm_port *port = event->port;
1950
1951         mutex_lock(&port->lock);
1952
1953         tcpm_log(port, "PD RX, header: %#x [%d]", le16_to_cpu(msg->header),
1954                  port->attached);
1955
1956         if (port->attached) {
1957                 enum pd_ctrl_msg_type type = pd_header_type_le(msg->header);
1958                 unsigned int msgid = pd_header_msgid_le(msg->header);
1959
1960                 /*
1961                  * USB PD standard, 6.6.1.2:
1962                  * "... if MessageID value in a received Message is the
1963                  * same as the stored value, the receiver shall return a
1964                  * GoodCRC Message with that MessageID value and drop
1965                  * the Message (this is a retry of an already received
1966                  * Message). Note: this shall not apply to the Soft_Reset
1967                  * Message which always has a MessageID value of zero."
1968                  */
1969                 if (msgid == port->rx_msgid && type != PD_CTRL_SOFT_RESET)
1970                         goto done;
1971                 port->rx_msgid = msgid;
1972
1973                 /*
1974                  * If both ends believe to be DFP/host, we have a data role
1975                  * mismatch.
1976                  */
1977                 if (!!(le16_to_cpu(msg->header) & PD_HEADER_DATA_ROLE) ==
1978                     (port->data_role == TYPEC_HOST)) {
1979                         tcpm_log(port,
1980                                  "Data role mismatch, initiating error recovery");
1981                         tcpm_set_state(port, ERROR_RECOVERY, 0);
1982                 } else {
1983                         if (msg->header & PD_HEADER_EXT_HDR)
1984                                 tcpm_pd_ext_msg_request(port, msg);
1985                         else if (cnt)
1986                                 tcpm_pd_data_request(port, msg);
1987                         else
1988                                 tcpm_pd_ctrl_request(port, msg);
1989                 }
1990         }
1991
1992 done:
1993         mutex_unlock(&port->lock);
1994         kfree(event);
1995 }
1996
1997 void tcpm_pd_receive(struct tcpm_port *port, const struct pd_message *msg)
1998 {
1999         struct pd_rx_event *event;
2000
2001         event = kzalloc(sizeof(*event), GFP_ATOMIC);
2002         if (!event)
2003                 return;
2004
2005         INIT_WORK(&event->work, tcpm_pd_rx_handler);
2006         event->port = port;
2007         memcpy(&event->msg, msg, sizeof(*msg));
2008         queue_work(port->wq, &event->work);
2009 }
2010 EXPORT_SYMBOL_GPL(tcpm_pd_receive);
2011
2012 static int tcpm_pd_send_control(struct tcpm_port *port,
2013                                 enum pd_ctrl_msg_type type)
2014 {
2015         struct pd_message msg;
2016
2017         memset(&msg, 0, sizeof(msg));
2018         msg.header = PD_HEADER_LE(type, port->pwr_role,
2019                                   port->data_role,
2020                                   port->negotiated_rev,
2021                                   port->message_id, 0);
2022
2023         return tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
2024 }
2025
2026 /*
2027  * Send queued message without affecting state.
2028  * Return true if state machine should go back to sleep,
2029  * false otherwise.
2030  */
2031 static bool tcpm_send_queued_message(struct tcpm_port *port)
2032 {
2033         enum pd_msg_request queued_message;
2034
2035         do {
2036                 queued_message = port->queued_message;
2037                 port->queued_message = PD_MSG_NONE;
2038
2039                 switch (queued_message) {
2040                 case PD_MSG_CTRL_WAIT:
2041                         tcpm_pd_send_control(port, PD_CTRL_WAIT);
2042                         break;
2043                 case PD_MSG_CTRL_REJECT:
2044                         tcpm_pd_send_control(port, PD_CTRL_REJECT);
2045                         break;
2046                 case PD_MSG_CTRL_NOT_SUPP:
2047                         tcpm_pd_send_control(port, PD_CTRL_NOT_SUPP);
2048                         break;
2049                 case PD_MSG_DATA_SINK_CAP:
2050                         tcpm_pd_send_sink_caps(port);
2051                         break;
2052                 case PD_MSG_DATA_SOURCE_CAP:
2053                         tcpm_pd_send_source_caps(port);
2054                         break;
2055                 default:
2056                         break;
2057                 }
2058         } while (port->queued_message != PD_MSG_NONE);
2059
2060         if (port->delayed_state != INVALID_STATE) {
2061                 if (time_is_after_jiffies(port->delayed_runtime)) {
2062                         mod_delayed_work(port->wq, &port->state_machine,
2063                                          port->delayed_runtime - jiffies);
2064                         return true;
2065                 }
2066                 port->delayed_state = INVALID_STATE;
2067         }
2068         return false;
2069 }
2070
2071 static int tcpm_pd_check_request(struct tcpm_port *port)
2072 {
2073         u32 pdo, rdo = port->sink_request;
2074         unsigned int max, op, pdo_max, index;
2075         enum pd_pdo_type type;
2076
2077         index = rdo_index(rdo);
2078         if (!index || index > port->nr_src_pdo)
2079                 return -EINVAL;
2080
2081         pdo = port->src_pdo[index - 1];
2082         type = pdo_type(pdo);
2083         switch (type) {
2084         case PDO_TYPE_FIXED:
2085         case PDO_TYPE_VAR:
2086                 max = rdo_max_current(rdo);
2087                 op = rdo_op_current(rdo);
2088                 pdo_max = pdo_max_current(pdo);
2089
2090                 if (op > pdo_max)
2091                         return -EINVAL;
2092                 if (max > pdo_max && !(rdo & RDO_CAP_MISMATCH))
2093                         return -EINVAL;
2094
2095                 if (type == PDO_TYPE_FIXED)
2096                         tcpm_log(port,
2097                                  "Requested %u mV, %u mA for %u / %u mA",
2098                                  pdo_fixed_voltage(pdo), pdo_max, op, max);
2099                 else
2100                         tcpm_log(port,
2101                                  "Requested %u -> %u mV, %u mA for %u / %u mA",
2102                                  pdo_min_voltage(pdo), pdo_max_voltage(pdo),
2103                                  pdo_max, op, max);
2104                 break;
2105         case PDO_TYPE_BATT:
2106                 max = rdo_max_power(rdo);
2107                 op = rdo_op_power(rdo);
2108                 pdo_max = pdo_max_power(pdo);
2109
2110                 if (op > pdo_max)
2111                         return -EINVAL;
2112                 if (max > pdo_max && !(rdo & RDO_CAP_MISMATCH))
2113                         return -EINVAL;
2114                 tcpm_log(port,
2115                          "Requested %u -> %u mV, %u mW for %u / %u mW",
2116                          pdo_min_voltage(pdo), pdo_max_voltage(pdo),
2117                          pdo_max, op, max);
2118                 break;
2119         default:
2120                 return -EINVAL;
2121         }
2122
2123         port->op_vsafe5v = index == 1;
2124
2125         return 0;
2126 }
2127
2128 #define min_power(x, y) min(pdo_max_power(x), pdo_max_power(y))
2129 #define min_current(x, y) min(pdo_max_current(x), pdo_max_current(y))
2130
2131 static int tcpm_pd_select_pdo(struct tcpm_port *port, int *sink_pdo,
2132                               int *src_pdo)
2133 {
2134         unsigned int i, j, max_src_mv = 0, min_src_mv = 0, max_mw = 0,
2135                      max_mv = 0, src_mw = 0, src_ma = 0, max_snk_mv = 0,
2136                      min_snk_mv = 0;
2137         int ret = -EINVAL;
2138
2139         port->pps_data.supported = false;
2140         port->usb_type = POWER_SUPPLY_USB_TYPE_PD;
2141
2142         /*
2143          * Select the source PDO providing the most power which has a
2144          * matchig sink cap.
2145          */
2146         for (i = 0; i < port->nr_source_caps; i++) {
2147                 u32 pdo = port->source_caps[i];
2148                 enum pd_pdo_type type = pdo_type(pdo);
2149
2150                 switch (type) {
2151                 case PDO_TYPE_FIXED:
2152                         max_src_mv = pdo_fixed_voltage(pdo);
2153                         min_src_mv = max_src_mv;
2154                         break;
2155                 case PDO_TYPE_BATT:
2156                 case PDO_TYPE_VAR:
2157                         max_src_mv = pdo_max_voltage(pdo);
2158                         min_src_mv = pdo_min_voltage(pdo);
2159                         break;
2160                 case PDO_TYPE_APDO:
2161                         if (pdo_apdo_type(pdo) == APDO_TYPE_PPS) {
2162                                 port->pps_data.supported = true;
2163                                 port->usb_type =
2164                                         POWER_SUPPLY_USB_TYPE_PD_PPS;
2165                         }
2166                         continue;
2167                 default:
2168                         tcpm_log(port, "Invalid source PDO type, ignoring");
2169                         continue;
2170                 }
2171
2172                 switch (type) {
2173                 case PDO_TYPE_FIXED:
2174                 case PDO_TYPE_VAR:
2175                         src_ma = pdo_max_current(pdo);
2176                         src_mw = src_ma * min_src_mv / 1000;
2177                         break;
2178                 case PDO_TYPE_BATT:
2179                         src_mw = pdo_max_power(pdo);
2180                         break;
2181                 case PDO_TYPE_APDO:
2182                         continue;
2183                 default:
2184                         tcpm_log(port, "Invalid source PDO type, ignoring");
2185                         continue;
2186                 }
2187
2188                 for (j = 0; j < port->nr_snk_pdo; j++) {
2189                         pdo = port->snk_pdo[j];
2190
2191                         switch (pdo_type(pdo)) {
2192                         case PDO_TYPE_FIXED:
2193                                 max_snk_mv = pdo_fixed_voltage(pdo);
2194                                 min_snk_mv = max_snk_mv;
2195                                 break;
2196                         case PDO_TYPE_BATT:
2197                         case PDO_TYPE_VAR:
2198                                 max_snk_mv = pdo_max_voltage(pdo);
2199                                 min_snk_mv = pdo_min_voltage(pdo);
2200                                 break;
2201                         case PDO_TYPE_APDO:
2202                                 continue;
2203                         default:
2204                                 tcpm_log(port, "Invalid sink PDO type, ignoring");
2205                                 continue;
2206                         }
2207
2208                         if (max_src_mv <= max_snk_mv &&
2209                                 min_src_mv >= min_snk_mv) {
2210                                 /* Prefer higher voltages if available */
2211                                 if ((src_mw == max_mw && min_src_mv > max_mv) ||
2212                                                         src_mw > max_mw) {
2213                                         *src_pdo = i;
2214                                         *sink_pdo = j;
2215                                         max_mw = src_mw;
2216                                         max_mv = min_src_mv;
2217                                         ret = 0;
2218                                 }
2219                         }
2220                 }
2221         }
2222
2223         return ret;
2224 }
2225
2226 #define min_pps_apdo_current(x, y)      \
2227         min(pdo_pps_apdo_max_current(x), pdo_pps_apdo_max_current(y))
2228
2229 static unsigned int tcpm_pd_select_pps_apdo(struct tcpm_port *port)
2230 {
2231         unsigned int i, j, max_mw = 0, max_mv = 0;
2232         unsigned int min_src_mv, max_src_mv, src_ma, src_mw;
2233         unsigned int min_snk_mv, max_snk_mv;
2234         unsigned int max_op_mv;
2235         u32 pdo, src, snk;
2236         unsigned int src_pdo = 0, snk_pdo = 0;
2237
2238         /*
2239          * Select the source PPS APDO providing the most power while staying
2240          * within the board's limits. We skip the first PDO as this is always
2241          * 5V 3A.
2242          */
2243         for (i = 1; i < port->nr_source_caps; ++i) {
2244                 pdo = port->source_caps[i];
2245
2246                 switch (pdo_type(pdo)) {
2247                 case PDO_TYPE_APDO:
2248                         if (pdo_apdo_type(pdo) != APDO_TYPE_PPS) {
2249                                 tcpm_log(port, "Not PPS APDO (source), ignoring");
2250                                 continue;
2251                         }
2252
2253                         min_src_mv = pdo_pps_apdo_min_voltage(pdo);
2254                         max_src_mv = pdo_pps_apdo_max_voltage(pdo);
2255                         src_ma = pdo_pps_apdo_max_current(pdo);
2256                         src_mw = (src_ma * max_src_mv) / 1000;
2257
2258                         /*
2259                          * Now search through the sink PDOs to find a matching
2260                          * PPS APDO. Again skip the first sink PDO as this will
2261                          * always be 5V 3A.
2262                          */
2263                         for (j = 1; j < port->nr_snk_pdo; j++) {
2264                                 pdo = port->snk_pdo[j];
2265
2266                                 switch (pdo_type(pdo)) {
2267                                 case PDO_TYPE_APDO:
2268                                         if (pdo_apdo_type(pdo) != APDO_TYPE_PPS) {
2269                                                 tcpm_log(port,
2270                                                          "Not PPS APDO (sink), ignoring");
2271                                                 continue;
2272                                         }
2273
2274                                         min_snk_mv =
2275                                                 pdo_pps_apdo_min_voltage(pdo);
2276                                         max_snk_mv =
2277                                                 pdo_pps_apdo_max_voltage(pdo);
2278                                         break;
2279                                 default:
2280                                         tcpm_log(port,
2281                                                  "Not APDO type (sink), ignoring");
2282                                         continue;
2283                                 }
2284
2285                                 if (min_src_mv <= max_snk_mv &&
2286                                     max_src_mv >= min_snk_mv) {
2287                                         max_op_mv = min(max_src_mv, max_snk_mv);
2288                                         src_mw = (max_op_mv * src_ma) / 1000;
2289                                         /* Prefer higher voltages if available */
2290                                         if ((src_mw == max_mw &&
2291                                              max_op_mv > max_mv) ||
2292                                             src_mw > max_mw) {
2293                                                 src_pdo = i;
2294                                                 snk_pdo = j;
2295                                                 max_mw = src_mw;
2296                                                 max_mv = max_op_mv;
2297                                         }
2298                                 }
2299                         }
2300
2301                         break;
2302                 default:
2303                         tcpm_log(port, "Not APDO type (source), ignoring");
2304                         continue;
2305                 }
2306         }
2307
2308         if (src_pdo) {
2309                 src = port->source_caps[src_pdo];
2310                 snk = port->snk_pdo[snk_pdo];
2311
2312                 port->pps_data.min_volt = max(pdo_pps_apdo_min_voltage(src),
2313                                               pdo_pps_apdo_min_voltage(snk));
2314                 port->pps_data.max_volt = min(pdo_pps_apdo_max_voltage(src),
2315                                               pdo_pps_apdo_max_voltage(snk));
2316                 port->pps_data.max_curr = min_pps_apdo_current(src, snk);
2317                 port->pps_data.out_volt = min(port->pps_data.max_volt,
2318                                               max(port->pps_data.min_volt,
2319                                                   port->pps_data.out_volt));
2320                 port->pps_data.op_curr = min(port->pps_data.max_curr,
2321                                              port->pps_data.op_curr);
2322         }
2323
2324         return src_pdo;
2325 }
2326
2327 static int tcpm_pd_build_request(struct tcpm_port *port, u32 *rdo)
2328 {
2329         unsigned int mv, ma, mw, flags;
2330         unsigned int max_ma, max_mw;
2331         enum pd_pdo_type type;
2332         u32 pdo, matching_snk_pdo;
2333         int src_pdo_index = 0;
2334         int snk_pdo_index = 0;
2335         int ret;
2336
2337         ret = tcpm_pd_select_pdo(port, &snk_pdo_index, &src_pdo_index);
2338         if (ret < 0)
2339                 return ret;
2340
2341         pdo = port->source_caps[src_pdo_index];
2342         matching_snk_pdo = port->snk_pdo[snk_pdo_index];
2343         type = pdo_type(pdo);
2344
2345         switch (type) {
2346         case PDO_TYPE_FIXED:
2347                 mv = pdo_fixed_voltage(pdo);
2348                 break;
2349         case PDO_TYPE_BATT:
2350         case PDO_TYPE_VAR:
2351                 mv = pdo_min_voltage(pdo);
2352                 break;
2353         default:
2354                 tcpm_log(port, "Invalid PDO selected!");
2355                 return -EINVAL;
2356         }
2357
2358         /* Select maximum available current within the sink pdo's limit */
2359         if (type == PDO_TYPE_BATT) {
2360                 mw = min_power(pdo, matching_snk_pdo);
2361                 ma = 1000 * mw / mv;
2362         } else {
2363                 ma = min_current(pdo, matching_snk_pdo);
2364                 mw = ma * mv / 1000;
2365         }
2366
2367         flags = RDO_USB_COMM | RDO_NO_SUSPEND;
2368
2369         /* Set mismatch bit if offered power is less than operating power */
2370         max_ma = ma;
2371         max_mw = mw;
2372         if (mw < port->operating_snk_mw) {
2373                 flags |= RDO_CAP_MISMATCH;
2374                 if (type == PDO_TYPE_BATT &&
2375                     (pdo_max_power(matching_snk_pdo) > pdo_max_power(pdo)))
2376                         max_mw = pdo_max_power(matching_snk_pdo);
2377                 else if (pdo_max_current(matching_snk_pdo) >
2378                          pdo_max_current(pdo))
2379                         max_ma = pdo_max_current(matching_snk_pdo);
2380         }
2381
2382         tcpm_log(port, "cc=%d cc1=%d cc2=%d vbus=%d vconn=%s polarity=%d",
2383                  port->cc_req, port->cc1, port->cc2, port->vbus_source,
2384                  port->vconn_role == TYPEC_SOURCE ? "source" : "sink",
2385                  port->polarity);
2386
2387         if (type == PDO_TYPE_BATT) {
2388                 *rdo = RDO_BATT(src_pdo_index + 1, mw, max_mw, flags);
2389
2390                 tcpm_log(port, "Requesting PDO %d: %u mV, %u mW%s",
2391                          src_pdo_index, mv, mw,
2392                          flags & RDO_CAP_MISMATCH ? " [mismatch]" : "");
2393         } else {
2394                 *rdo = RDO_FIXED(src_pdo_index + 1, ma, max_ma, flags);
2395
2396                 tcpm_log(port, "Requesting PDO %d: %u mV, %u mA%s",
2397                          src_pdo_index, mv, ma,
2398                          flags & RDO_CAP_MISMATCH ? " [mismatch]" : "");
2399         }
2400
2401         port->current_limit = ma;
2402         port->supply_voltage = mv;
2403
2404         return 0;
2405 }
2406
2407 static int tcpm_pd_send_request(struct tcpm_port *port)
2408 {
2409         struct pd_message msg;
2410         int ret;
2411         u32 rdo;
2412
2413         ret = tcpm_pd_build_request(port, &rdo);
2414         if (ret < 0)
2415                 return ret;
2416
2417         memset(&msg, 0, sizeof(msg));
2418         msg.header = PD_HEADER_LE(PD_DATA_REQUEST,
2419                                   port->pwr_role,
2420                                   port->data_role,
2421                                   port->negotiated_rev,
2422                                   port->message_id, 1);
2423         msg.payload[0] = cpu_to_le32(rdo);
2424
2425         return tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
2426 }
2427
2428 static int tcpm_pd_build_pps_request(struct tcpm_port *port, u32 *rdo)
2429 {
2430         unsigned int out_mv, op_ma, op_mw, max_mv, max_ma, flags;
2431         enum pd_pdo_type type;
2432         unsigned int src_pdo_index;
2433         u32 pdo;
2434
2435         src_pdo_index = tcpm_pd_select_pps_apdo(port);
2436         if (!src_pdo_index)
2437                 return -EOPNOTSUPP;
2438
2439         pdo = port->source_caps[src_pdo_index];
2440         type = pdo_type(pdo);
2441
2442         switch (type) {
2443         case PDO_TYPE_APDO:
2444                 if (pdo_apdo_type(pdo) != APDO_TYPE_PPS) {
2445                         tcpm_log(port, "Invalid APDO selected!");
2446                         return -EINVAL;
2447                 }
2448                 max_mv = port->pps_data.max_volt;
2449                 max_ma = port->pps_data.max_curr;
2450                 out_mv = port->pps_data.out_volt;
2451                 op_ma = port->pps_data.op_curr;
2452                 break;
2453         default:
2454                 tcpm_log(port, "Invalid PDO selected!");
2455                 return -EINVAL;
2456         }
2457
2458         flags = RDO_USB_COMM | RDO_NO_SUSPEND;
2459
2460         op_mw = (op_ma * out_mv) / 1000;
2461         if (op_mw < port->operating_snk_mw) {
2462                 /*
2463                  * Try raising current to meet power needs. If that's not enough
2464                  * then try upping the voltage. If that's still not enough
2465                  * then we've obviously chosen a PPS APDO which really isn't
2466                  * suitable so abandon ship.
2467                  */
2468                 op_ma = (port->operating_snk_mw * 1000) / out_mv;
2469                 if ((port->operating_snk_mw * 1000) % out_mv)
2470                         ++op_ma;
2471                 op_ma += RDO_PROG_CURR_MA_STEP - (op_ma % RDO_PROG_CURR_MA_STEP);
2472
2473                 if (op_ma > max_ma) {
2474                         op_ma = max_ma;
2475                         out_mv = (port->operating_snk_mw * 1000) / op_ma;
2476                         if ((port->operating_snk_mw * 1000) % op_ma)
2477                                 ++out_mv;
2478                         out_mv += RDO_PROG_VOLT_MV_STEP -
2479                                   (out_mv % RDO_PROG_VOLT_MV_STEP);
2480
2481                         if (out_mv > max_mv) {
2482                                 tcpm_log(port, "Invalid PPS APDO selected!");
2483                                 return -EINVAL;
2484                         }
2485                 }
2486         }
2487
2488         tcpm_log(port, "cc=%d cc1=%d cc2=%d vbus=%d vconn=%s polarity=%d",
2489                  port->cc_req, port->cc1, port->cc2, port->vbus_source,
2490                  port->vconn_role == TYPEC_SOURCE ? "source" : "sink",
2491                  port->polarity);
2492
2493         *rdo = RDO_PROG(src_pdo_index + 1, out_mv, op_ma, flags);
2494
2495         tcpm_log(port, "Requesting APDO %d: %u mV, %u mA",
2496                  src_pdo_index, out_mv, op_ma);
2497
2498         port->pps_data.op_curr = op_ma;
2499         port->pps_data.out_volt = out_mv;
2500
2501         return 0;
2502 }
2503
2504 static int tcpm_pd_send_pps_request(struct tcpm_port *port)
2505 {
2506         struct pd_message msg;
2507         int ret;
2508         u32 rdo;
2509
2510         ret = tcpm_pd_build_pps_request(port, &rdo);
2511         if (ret < 0)
2512                 return ret;
2513
2514         memset(&msg, 0, sizeof(msg));
2515         msg.header = PD_HEADER_LE(PD_DATA_REQUEST,
2516                                   port->pwr_role,
2517                                   port->data_role,
2518                                   port->negotiated_rev,
2519                                   port->message_id, 1);
2520         msg.payload[0] = cpu_to_le32(rdo);
2521
2522         return tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
2523 }
2524
2525 static int tcpm_set_vbus(struct tcpm_port *port, bool enable)
2526 {
2527         int ret;
2528
2529         if (enable && port->vbus_charge)
2530                 return -EINVAL;
2531
2532         tcpm_log(port, "vbus:=%d charge=%d", enable, port->vbus_charge);
2533
2534         ret = port->tcpc->set_vbus(port->tcpc, enable, port->vbus_charge);
2535         if (ret < 0)
2536                 return ret;
2537
2538         port->vbus_source = enable;
2539         return 0;
2540 }
2541
2542 static int tcpm_set_charge(struct tcpm_port *port, bool charge)
2543 {
2544         int ret;
2545
2546         if (charge && port->vbus_source)
2547                 return -EINVAL;
2548
2549         if (charge != port->vbus_charge) {
2550                 tcpm_log(port, "vbus=%d charge:=%d", port->vbus_source, charge);
2551                 ret = port->tcpc->set_vbus(port->tcpc, port->vbus_source,
2552                                            charge);
2553                 if (ret < 0)
2554                         return ret;
2555         }
2556         port->vbus_charge = charge;
2557         return 0;
2558 }
2559
2560 static bool tcpm_start_toggling(struct tcpm_port *port, enum typec_cc_status cc)
2561 {
2562         int ret;
2563
2564         if (!port->tcpc->start_toggling)
2565                 return false;
2566
2567         tcpm_log_force(port, "Start toggling");
2568         ret = port->tcpc->start_toggling(port->tcpc, port->port_type, cc);
2569         return ret == 0;
2570 }
2571
2572 static void tcpm_set_cc(struct tcpm_port *port, enum typec_cc_status cc)
2573 {
2574         tcpm_log(port, "cc:=%d", cc);
2575         port->cc_req = cc;
2576         port->tcpc->set_cc(port->tcpc, cc);
2577 }
2578
2579 static int tcpm_init_vbus(struct tcpm_port *port)
2580 {
2581         int ret;
2582
2583         ret = port->tcpc->set_vbus(port->tcpc, false, false);
2584         port->vbus_source = false;
2585         port->vbus_charge = false;
2586         return ret;
2587 }
2588
2589 static int tcpm_init_vconn(struct tcpm_port *port)
2590 {
2591         int ret;
2592
2593         ret = port->tcpc->set_vconn(port->tcpc, false);
2594         port->vconn_role = TYPEC_SINK;
2595         return ret;
2596 }
2597
2598 static void tcpm_typec_connect(struct tcpm_port *port)
2599 {
2600         if (!port->connected) {
2601                 /* Make sure we don't report stale identity information */
2602                 memset(&port->partner_ident, 0, sizeof(port->partner_ident));
2603                 port->partner_desc.usb_pd = port->pd_capable;
2604                 if (tcpm_port_is_debug(port))
2605                         port->partner_desc.accessory = TYPEC_ACCESSORY_DEBUG;
2606                 else if (tcpm_port_is_audio(port))
2607                         port->partner_desc.accessory = TYPEC_ACCESSORY_AUDIO;
2608                 else
2609                         port->partner_desc.accessory = TYPEC_ACCESSORY_NONE;
2610                 port->partner = typec_register_partner(port->typec_port,
2611                                                        &port->partner_desc);
2612                 port->connected = true;
2613         }
2614 }
2615
2616 static int tcpm_src_attach(struct tcpm_port *port)
2617 {
2618         enum typec_cc_polarity polarity =
2619                                 port->cc2 == TYPEC_CC_RD ? TYPEC_POLARITY_CC2
2620                                                          : TYPEC_POLARITY_CC1;
2621         int ret;
2622
2623         if (port->attached)
2624                 return 0;
2625
2626         ret = tcpm_set_polarity(port, polarity);
2627         if (ret < 0)
2628                 return ret;
2629
2630         ret = tcpm_set_roles(port, true, TYPEC_SOURCE, TYPEC_HOST);
2631         if (ret < 0)
2632                 return ret;
2633
2634         ret = port->tcpc->set_pd_rx(port->tcpc, true);
2635         if (ret < 0)
2636                 goto out_disable_mux;
2637
2638         /*
2639          * USB Type-C specification, version 1.2,
2640          * chapter 4.5.2.2.8.1 (Attached.SRC Requirements)
2641          * Enable VCONN only if the non-RD port is set to RA.
2642          */
2643         if ((polarity == TYPEC_POLARITY_CC1 && port->cc2 == TYPEC_CC_RA) ||
2644             (polarity == TYPEC_POLARITY_CC2 && port->cc1 == TYPEC_CC_RA)) {
2645                 ret = tcpm_set_vconn(port, true);
2646                 if (ret < 0)
2647                         goto out_disable_pd;
2648         }
2649
2650         ret = tcpm_set_vbus(port, true);
2651         if (ret < 0)
2652                 goto out_disable_vconn;
2653
2654         port->pd_capable = false;
2655
2656         port->partner = NULL;
2657
2658         port->attached = true;
2659         port->send_discover = true;
2660
2661         return 0;
2662
2663 out_disable_vconn:
2664         tcpm_set_vconn(port, false);
2665 out_disable_pd:
2666         port->tcpc->set_pd_rx(port->tcpc, false);
2667 out_disable_mux:
2668         tcpm_mux_set(port, TYPEC_STATE_SAFE, USB_ROLE_NONE,
2669                      TYPEC_ORIENTATION_NONE);
2670         return ret;
2671 }
2672
2673 static void tcpm_typec_disconnect(struct tcpm_port *port)
2674 {
2675         if (port->connected) {
2676                 typec_unregister_partner(port->partner);
2677                 port->partner = NULL;
2678                 port->connected = false;
2679         }
2680 }
2681
2682 static void tcpm_unregister_altmodes(struct tcpm_port *port)
2683 {
2684         struct pd_mode_data *modep = &port->mode_data;
2685         int i;
2686
2687         for (i = 0; i < modep->altmodes; i++) {
2688                 typec_unregister_altmode(port->partner_altmode[i]);
2689                 port->partner_altmode[i] = NULL;
2690         }
2691
2692         memset(modep, 0, sizeof(*modep));
2693 }
2694
2695 static void tcpm_reset_port(struct tcpm_port *port)
2696 {
2697         tcpm_unregister_altmodes(port);
2698         tcpm_typec_disconnect(port);
2699         port->attached = false;
2700         port->pd_capable = false;
2701         port->pps_data.supported = false;
2702
2703         /*
2704          * First Rx ID should be 0; set this to a sentinel of -1 so that
2705          * we can check tcpm_pd_rx_handler() if we had seen it before.
2706          */
2707         port->rx_msgid = -1;
2708
2709         port->tcpc->set_pd_rx(port->tcpc, false);
2710         tcpm_init_vbus(port);   /* also disables charging */
2711         tcpm_init_vconn(port);
2712         tcpm_set_current_limit(port, 0, 0);
2713         tcpm_set_polarity(port, TYPEC_POLARITY_CC1);
2714         tcpm_mux_set(port, TYPEC_STATE_SAFE, USB_ROLE_NONE,
2715                      TYPEC_ORIENTATION_NONE);
2716         tcpm_set_attached_state(port, false);
2717         port->try_src_count = 0;
2718         port->try_snk_count = 0;
2719         port->usb_type = POWER_SUPPLY_USB_TYPE_C;
2720
2721         power_supply_changed(port->psy);
2722 }
2723
2724 static void tcpm_detach(struct tcpm_port *port)
2725 {
2726         if (!port->attached)
2727                 return;
2728
2729         if (tcpm_port_is_disconnected(port))
2730                 port->hard_reset_count = 0;
2731
2732         tcpm_reset_port(port);
2733 }
2734
2735 static void tcpm_src_detach(struct tcpm_port *port)
2736 {
2737         tcpm_detach(port);
2738 }
2739
2740 static int tcpm_snk_attach(struct tcpm_port *port)
2741 {
2742         int ret;
2743
2744         if (port->attached)
2745                 return 0;
2746
2747         ret = tcpm_set_polarity(port, port->cc2 != TYPEC_CC_OPEN ?
2748                                 TYPEC_POLARITY_CC2 : TYPEC_POLARITY_CC1);
2749         if (ret < 0)
2750                 return ret;
2751
2752         ret = tcpm_set_roles(port, true, TYPEC_SINK, TYPEC_DEVICE);
2753         if (ret < 0)
2754                 return ret;
2755
2756         port->pd_capable = false;
2757
2758         port->partner = NULL;
2759
2760         port->attached = true;
2761         port->send_discover = true;
2762
2763         return 0;
2764 }
2765
2766 static void tcpm_snk_detach(struct tcpm_port *port)
2767 {
2768         tcpm_detach(port);
2769 }
2770
2771 static int tcpm_acc_attach(struct tcpm_port *port)
2772 {
2773         int ret;
2774
2775         if (port->attached)
2776                 return 0;
2777
2778         ret = tcpm_set_roles(port, true, TYPEC_SOURCE, TYPEC_HOST);
2779         if (ret < 0)
2780                 return ret;
2781
2782         port->partner = NULL;
2783
2784         tcpm_typec_connect(port);
2785
2786         port->attached = true;
2787
2788         return 0;
2789 }
2790
2791 static void tcpm_acc_detach(struct tcpm_port *port)
2792 {
2793         tcpm_detach(port);
2794 }
2795
2796 static inline enum tcpm_state hard_reset_state(struct tcpm_port *port)
2797 {
2798         if (port->hard_reset_count < PD_N_HARD_RESET_COUNT)
2799                 return HARD_RESET_SEND;
2800         if (port->pd_capable)
2801                 return ERROR_RECOVERY;
2802         if (port->pwr_role == TYPEC_SOURCE)
2803                 return SRC_UNATTACHED;
2804         if (port->state == SNK_WAIT_CAPABILITIES)
2805                 return SNK_READY;
2806         return SNK_UNATTACHED;
2807 }
2808
2809 static inline enum tcpm_state unattached_state(struct tcpm_port *port)
2810 {
2811         if (port->port_type == TYPEC_PORT_DRP) {
2812                 if (port->pwr_role == TYPEC_SOURCE)
2813                         return SRC_UNATTACHED;
2814                 else
2815                         return SNK_UNATTACHED;
2816         } else if (port->port_type == TYPEC_PORT_SRC) {
2817                 return SRC_UNATTACHED;
2818         }
2819
2820         return SNK_UNATTACHED;
2821 }
2822
2823 static void tcpm_check_send_discover(struct tcpm_port *port)
2824 {
2825         if (port->data_role == TYPEC_HOST && port->send_discover &&
2826             port->pd_capable) {
2827                 tcpm_send_vdm(port, USB_SID_PD, CMD_DISCOVER_IDENT, NULL, 0);
2828                 port->send_discover = false;
2829         }
2830 }
2831
2832 static void tcpm_swap_complete(struct tcpm_port *port, int result)
2833 {
2834         if (port->swap_pending) {
2835                 port->swap_status = result;
2836                 port->swap_pending = false;
2837                 port->non_pd_role_swap = false;
2838                 complete(&port->swap_complete);
2839         }
2840 }
2841
2842 static enum typec_pwr_opmode tcpm_get_pwr_opmode(enum typec_cc_status cc)
2843 {
2844         switch (cc) {
2845         case TYPEC_CC_RP_1_5:
2846                 return TYPEC_PWR_MODE_1_5A;
2847         case TYPEC_CC_RP_3_0:
2848                 return TYPEC_PWR_MODE_3_0A;
2849         case TYPEC_CC_RP_DEF:
2850         default:
2851                 return TYPEC_PWR_MODE_USB;
2852         }
2853 }
2854
2855 static void run_state_machine(struct tcpm_port *port)
2856 {
2857         int ret;
2858         enum typec_pwr_opmode opmode;
2859         unsigned int msecs;
2860
2861         port->enter_state = port->state;
2862         switch (port->state) {
2863         case TOGGLING:
2864                 break;
2865         /* SRC states */
2866         case SRC_UNATTACHED:
2867                 if (!port->non_pd_role_swap)
2868                         tcpm_swap_complete(port, -ENOTCONN);
2869                 tcpm_src_detach(port);
2870                 if (tcpm_start_toggling(port, tcpm_rp_cc(port))) {
2871                         tcpm_set_state(port, TOGGLING, 0);
2872                         break;
2873                 }
2874                 tcpm_set_cc(port, tcpm_rp_cc(port));
2875                 if (port->port_type == TYPEC_PORT_DRP)
2876                         tcpm_set_state(port, SNK_UNATTACHED, PD_T_DRP_SNK);
2877                 break;
2878         case SRC_ATTACH_WAIT:
2879                 if (tcpm_port_is_debug(port))
2880                         tcpm_set_state(port, DEBUG_ACC_ATTACHED,
2881                                        PD_T_CC_DEBOUNCE);
2882                 else if (tcpm_port_is_audio(port))
2883                         tcpm_set_state(port, AUDIO_ACC_ATTACHED,
2884                                        PD_T_CC_DEBOUNCE);
2885                 else if (tcpm_port_is_source(port))
2886                         tcpm_set_state(port,
2887                                        tcpm_try_snk(port) ? SNK_TRY
2888                                                           : SRC_ATTACHED,
2889                                        PD_T_CC_DEBOUNCE);
2890                 break;
2891
2892         case SNK_TRY:
2893                 port->try_snk_count++;
2894                 /*
2895                  * Requirements:
2896                  * - Do not drive vconn or vbus
2897                  * - Terminate CC pins (both) to Rd
2898                  * Action:
2899                  * - Wait for tDRPTry (PD_T_DRP_TRY).
2900                  *   Until then, ignore any state changes.
2901                  */
2902                 tcpm_set_cc(port, TYPEC_CC_RD);
2903                 tcpm_set_state(port, SNK_TRY_WAIT, PD_T_DRP_TRY);
2904                 break;
2905         case SNK_TRY_WAIT:
2906                 if (tcpm_port_is_sink(port)) {
2907                         tcpm_set_state(port, SNK_TRY_WAIT_DEBOUNCE, 0);
2908                 } else {
2909                         tcpm_set_state(port, SRC_TRYWAIT, 0);
2910                         port->max_wait = 0;
2911                 }
2912                 break;
2913         case SNK_TRY_WAIT_DEBOUNCE:
2914                 tcpm_set_state(port, SNK_TRY_WAIT_DEBOUNCE_CHECK_VBUS,
2915                                PD_T_PD_DEBOUNCE);
2916                 break;
2917         case SNK_TRY_WAIT_DEBOUNCE_CHECK_VBUS:
2918                 if (port->vbus_present && tcpm_port_is_sink(port)) {
2919                         tcpm_set_state(port, SNK_ATTACHED, 0);
2920                 } else {
2921                         tcpm_set_state(port, SRC_TRYWAIT, 0);
2922                         port->max_wait = 0;
2923                 }
2924                 break;
2925         case SRC_TRYWAIT:
2926                 tcpm_set_cc(port, tcpm_rp_cc(port));
2927                 if (port->max_wait == 0) {
2928                         port->max_wait = jiffies +
2929                                          msecs_to_jiffies(PD_T_DRP_TRY);
2930                         tcpm_set_state(port, SRC_TRYWAIT_UNATTACHED,
2931                                        PD_T_DRP_TRY);
2932                 } else {
2933                         if (time_is_after_jiffies(port->max_wait))
2934                                 tcpm_set_state(port, SRC_TRYWAIT_UNATTACHED,
2935                                                jiffies_to_msecs(port->max_wait -
2936                                                                 jiffies));
2937                         else
2938                                 tcpm_set_state(port, SNK_UNATTACHED, 0);
2939                 }
2940                 break;
2941         case SRC_TRYWAIT_DEBOUNCE:
2942                 tcpm_set_state(port, SRC_ATTACHED, PD_T_CC_DEBOUNCE);
2943                 break;
2944         case SRC_TRYWAIT_UNATTACHED:
2945                 tcpm_set_state(port, SNK_UNATTACHED, 0);
2946                 break;
2947
2948         case SRC_ATTACHED:
2949                 ret = tcpm_src_attach(port);
2950                 tcpm_set_state(port, SRC_UNATTACHED,
2951                                ret < 0 ? 0 : PD_T_PS_SOURCE_ON);
2952                 break;
2953         case SRC_STARTUP:
2954                 opmode =  tcpm_get_pwr_opmode(tcpm_rp_cc(port));
2955                 typec_set_pwr_opmode(port->typec_port, opmode);
2956                 port->pwr_opmode = TYPEC_PWR_MODE_USB;
2957                 port->caps_count = 0;
2958                 port->negotiated_rev = PD_MAX_REV;
2959                 port->message_id = 0;
2960                 port->rx_msgid = -1;
2961                 port->explicit_contract = false;
2962                 tcpm_set_state(port, SRC_SEND_CAPABILITIES, 0);
2963                 break;
2964         case SRC_SEND_CAPABILITIES:
2965                 port->caps_count++;
2966                 if (port->caps_count > PD_N_CAPS_COUNT) {
2967                         tcpm_set_state(port, SRC_READY, 0);
2968                         break;
2969                 }
2970                 ret = tcpm_pd_send_source_caps(port);
2971                 if (ret < 0) {
2972                         tcpm_set_state(port, SRC_SEND_CAPABILITIES,
2973                                        PD_T_SEND_SOURCE_CAP);
2974                 } else {
2975                         /*
2976                          * Per standard, we should clear the reset counter here.
2977                          * However, that can result in state machine hang-ups.
2978                          * Reset it only in READY state to improve stability.
2979                          */
2980                         /* port->hard_reset_count = 0; */
2981                         port->caps_count = 0;
2982                         port->pd_capable = true;
2983                         tcpm_set_state_cond(port, SRC_SEND_CAPABILITIES_TIMEOUT,
2984                                             PD_T_SEND_SOURCE_CAP);
2985                 }
2986                 break;
2987         case SRC_SEND_CAPABILITIES_TIMEOUT:
2988                 /*
2989                  * Error recovery for a PD_DATA_SOURCE_CAP reply timeout.
2990                  *
2991                  * PD 2.0 sinks are supposed to accept src-capabilities with a
2992                  * 3.0 header and simply ignore any src PDOs which the sink does
2993                  * not understand such as PPS but some 2.0 sinks instead ignore
2994                  * the entire PD_DATA_SOURCE_CAP message, causing contract
2995                  * negotiation to fail.
2996                  *
2997                  * After PD_N_HARD_RESET_COUNT hard-reset attempts, we try
2998                  * sending src-capabilities with a lower PD revision to
2999                  * make these broken sinks work.
3000                  */
3001                 if (port->hard_reset_count < PD_N_HARD_RESET_COUNT) {
3002                         tcpm_set_state(port, HARD_RESET_SEND, 0);
3003                 } else if (port->negotiated_rev > PD_REV20) {
3004                         port->negotiated_rev--;
3005                         port->hard_reset_count = 0;
3006                         tcpm_set_state(port, SRC_SEND_CAPABILITIES, 0);
3007                 } else {
3008                         tcpm_set_state(port, hard_reset_state(port), 0);
3009                 }
3010                 break;
3011         case SRC_NEGOTIATE_CAPABILITIES:
3012                 ret = tcpm_pd_check_request(port);
3013                 if (ret < 0) {
3014                         tcpm_pd_send_control(port, PD_CTRL_REJECT);
3015                         if (!port->explicit_contract) {
3016                                 tcpm_set_state(port,
3017                                                SRC_WAIT_NEW_CAPABILITIES, 0);
3018                         } else {
3019                                 tcpm_set_state(port, SRC_READY, 0);
3020                         }
3021                 } else {
3022                         tcpm_pd_send_control(port, PD_CTRL_ACCEPT);
3023                         tcpm_set_state(port, SRC_TRANSITION_SUPPLY,
3024                                        PD_T_SRC_TRANSITION);
3025                 }
3026                 break;
3027         case SRC_TRANSITION_SUPPLY:
3028                 /* XXX: regulator_set_voltage(vbus, ...) */
3029                 tcpm_pd_send_control(port, PD_CTRL_PS_RDY);
3030                 port->explicit_contract = true;
3031                 typec_set_pwr_opmode(port->typec_port, TYPEC_PWR_MODE_PD);
3032                 port->pwr_opmode = TYPEC_PWR_MODE_PD;
3033                 tcpm_set_state_cond(port, SRC_READY, 0);
3034                 break;
3035         case SRC_READY:
3036 #if 1
3037                 port->hard_reset_count = 0;
3038 #endif
3039                 port->try_src_count = 0;
3040
3041                 tcpm_swap_complete(port, 0);
3042                 tcpm_typec_connect(port);
3043
3044                 tcpm_check_send_discover(port);
3045                 /*
3046                  * 6.3.5
3047                  * Sending ping messages is not necessary if
3048                  * - the source operates at vSafe5V
3049                  * or
3050                  * - The system is not operating in PD mode
3051                  * or
3052                  * - Both partners are connected using a Type-C connector
3053                  *
3054                  * There is no actual need to send PD messages since the local
3055                  * port type-c and the spec does not clearly say whether PD is
3056                  * possible when type-c is connected to Type-A/B
3057                  */
3058                 break;
3059         case SRC_WAIT_NEW_CAPABILITIES:
3060                 /* Nothing to do... */
3061                 break;
3062
3063         /* SNK states */
3064         case SNK_UNATTACHED:
3065                 if (!port->non_pd_role_swap)
3066                         tcpm_swap_complete(port, -ENOTCONN);
3067                 tcpm_pps_complete(port, -ENOTCONN);
3068                 tcpm_snk_detach(port);
3069                 if (tcpm_start_toggling(port, TYPEC_CC_RD)) {
3070                         tcpm_set_state(port, TOGGLING, 0);
3071                         break;
3072                 }
3073                 tcpm_set_cc(port, TYPEC_CC_RD);
3074                 if (port->port_type == TYPEC_PORT_DRP)
3075                         tcpm_set_state(port, SRC_UNATTACHED, PD_T_DRP_SRC);
3076                 break;
3077         case SNK_ATTACH_WAIT:
3078                 if ((port->cc1 == TYPEC_CC_OPEN &&
3079                      port->cc2 != TYPEC_CC_OPEN) ||
3080                     (port->cc1 != TYPEC_CC_OPEN &&
3081                      port->cc2 == TYPEC_CC_OPEN))
3082                         tcpm_set_state(port, SNK_DEBOUNCED,
3083                                        PD_T_CC_DEBOUNCE);
3084                 else if (tcpm_port_is_disconnected(port))
3085                         tcpm_set_state(port, SNK_UNATTACHED,
3086                                        PD_T_PD_DEBOUNCE);
3087                 break;
3088         case SNK_DEBOUNCED:
3089                 if (tcpm_port_is_disconnected(port))
3090                         tcpm_set_state(port, SNK_UNATTACHED,
3091                                        PD_T_PD_DEBOUNCE);
3092                 else if (port->vbus_present)
3093                         tcpm_set_state(port,
3094                                        tcpm_try_src(port) ? SRC_TRY
3095                                                           : SNK_ATTACHED,
3096                                        0);
3097                 else
3098                         /* Wait for VBUS, but not forever */
3099                         tcpm_set_state(port, PORT_RESET, PD_T_PS_SOURCE_ON);
3100                 break;
3101
3102         case SRC_TRY:
3103                 port->try_src_count++;
3104                 tcpm_set_cc(port, tcpm_rp_cc(port));
3105                 port->max_wait = 0;
3106                 tcpm_set_state(port, SRC_TRY_WAIT, 0);
3107                 break;
3108         case SRC_TRY_WAIT:
3109                 if (port->max_wait == 0) {
3110                         port->max_wait = jiffies +
3111                                          msecs_to_jiffies(PD_T_DRP_TRY);
3112                         msecs = PD_T_DRP_TRY;
3113                 } else {
3114                         if (time_is_after_jiffies(port->max_wait))
3115                                 msecs = jiffies_to_msecs(port->max_wait -
3116                                                          jiffies);
3117                         else
3118                                 msecs = 0;
3119                 }
3120                 tcpm_set_state(port, SNK_TRYWAIT, msecs);
3121                 break;
3122         case SRC_TRY_DEBOUNCE:
3123                 tcpm_set_state(port, SRC_ATTACHED, PD_T_PD_DEBOUNCE);
3124                 break;
3125         case SNK_TRYWAIT:
3126                 tcpm_set_cc(port, TYPEC_CC_RD);
3127                 tcpm_set_state(port, SNK_TRYWAIT_VBUS, PD_T_CC_DEBOUNCE);
3128                 break;
3129         case SNK_TRYWAIT_VBUS:
3130                 /*
3131                  * TCPM stays in this state indefinitely until VBUS
3132                  * is detected as long as Rp is not detected for
3133                  * more than a time period of tPDDebounce.
3134                  */
3135                 if (port->vbus_present && tcpm_port_is_sink(port)) {
3136                         tcpm_set_state(port, SNK_ATTACHED, 0);
3137                         break;
3138                 }
3139                 if (!tcpm_port_is_sink(port))
3140                         tcpm_set_state(port, SNK_TRYWAIT_DEBOUNCE, 0);
3141                 break;
3142         case SNK_TRYWAIT_DEBOUNCE:
3143                 tcpm_set_state(port, SNK_UNATTACHED, PD_T_PD_DEBOUNCE);
3144                 break;
3145         case SNK_ATTACHED:
3146                 ret = tcpm_snk_attach(port);
3147                 if (ret < 0)
3148                         tcpm_set_state(port, SNK_UNATTACHED, 0);
3149                 else
3150                         tcpm_set_state(port, SNK_STARTUP, 0);
3151                 break;
3152         case SNK_STARTUP:
3153                 opmode =  tcpm_get_pwr_opmode(port->polarity ?
3154                                               port->cc2 : port->cc1);
3155                 typec_set_pwr_opmode(port->typec_port, opmode);
3156                 port->pwr_opmode = TYPEC_PWR_MODE_USB;
3157                 port->negotiated_rev = PD_MAX_REV;
3158                 port->message_id = 0;
3159                 port->rx_msgid = -1;
3160                 port->explicit_contract = false;
3161                 tcpm_set_state(port, SNK_DISCOVERY, 0);
3162                 break;
3163         case SNK_DISCOVERY:
3164                 if (port->vbus_present) {
3165                         tcpm_set_current_limit(port,
3166                                                tcpm_get_current_limit(port),
3167                                                5000);
3168                         tcpm_set_charge(port, true);
3169                         tcpm_set_state(port, SNK_WAIT_CAPABILITIES, 0);
3170                         break;
3171                 }
3172                 /*
3173                  * For DRP, timeouts differ. Also, handling is supposed to be
3174                  * different and much more complex (dead battery detection;
3175                  * see USB power delivery specification, section 8.3.3.6.1.5.1).
3176                  */
3177                 tcpm_set_state(port, hard_reset_state(port),
3178                                port->port_type == TYPEC_PORT_DRP ?
3179                                         PD_T_DB_DETECT : PD_T_NO_RESPONSE);
3180                 break;
3181         case SNK_DISCOVERY_DEBOUNCE:
3182                 tcpm_set_state(port, SNK_DISCOVERY_DEBOUNCE_DONE,
3183                                PD_T_CC_DEBOUNCE);
3184                 break;
3185         case SNK_DISCOVERY_DEBOUNCE_DONE:
3186                 if (!tcpm_port_is_disconnected(port) &&
3187                     tcpm_port_is_sink(port) &&
3188                     time_is_after_jiffies(port->delayed_runtime)) {
3189                         tcpm_set_state(port, SNK_DISCOVERY,
3190                                        jiffies_to_msecs(port->delayed_runtime -
3191                                                         jiffies));
3192                         break;
3193                 }
3194                 tcpm_set_state(port, unattached_state(port), 0);
3195                 break;
3196         case SNK_WAIT_CAPABILITIES:
3197                 ret = port->tcpc->set_pd_rx(port->tcpc, true);
3198                 if (ret < 0) {
3199                         tcpm_set_state(port, SNK_READY, 0);
3200                         break;
3201                 }
3202                 /*
3203                  * If VBUS has never been low, and we time out waiting
3204                  * for source cap, try a soft reset first, in case we
3205                  * were already in a stable contract before this boot.
3206                  * Do this only once.
3207                  */
3208                 if (port->vbus_never_low) {
3209                         port->vbus_never_low = false;
3210                         tcpm_set_state(port, SOFT_RESET_SEND,
3211                                        PD_T_SINK_WAIT_CAP);
3212                 } else {
3213                         tcpm_set_state(port, hard_reset_state(port),
3214                                        PD_T_SINK_WAIT_CAP);
3215                 }
3216                 break;
3217         case SNK_NEGOTIATE_CAPABILITIES:
3218                 port->pd_capable = true;
3219                 port->hard_reset_count = 0;
3220                 ret = tcpm_pd_send_request(port);
3221                 if (ret < 0) {
3222                         /* Let the Source send capabilities again. */
3223                         tcpm_set_state(port, SNK_WAIT_CAPABILITIES, 0);
3224                 } else {
3225                         tcpm_set_state_cond(port, hard_reset_state(port),
3226                                             PD_T_SENDER_RESPONSE);
3227                 }
3228                 break;
3229         case SNK_NEGOTIATE_PPS_CAPABILITIES:
3230                 ret = tcpm_pd_send_pps_request(port);
3231                 if (ret < 0) {
3232                         port->pps_status = ret;
3233                         /*
3234                          * If this was called due to updates to sink
3235                          * capabilities, and pps is no longer valid, we should
3236                          * safely fall back to a standard PDO.
3237                          */
3238                         if (port->update_sink_caps)
3239                                 tcpm_set_state(port, SNK_NEGOTIATE_CAPABILITIES, 0);
3240                         else
3241                                 tcpm_set_state(port, SNK_READY, 0);
3242                 } else {
3243                         tcpm_set_state_cond(port, hard_reset_state(port),
3244                                             PD_T_SENDER_RESPONSE);
3245                 }
3246                 break;
3247         case SNK_TRANSITION_SINK:
3248         case SNK_TRANSITION_SINK_VBUS:
3249                 tcpm_set_state(port, hard_reset_state(port),
3250                                PD_T_PS_TRANSITION);
3251                 break;
3252         case SNK_READY:
3253                 port->try_snk_count = 0;
3254                 port->update_sink_caps = false;
3255                 if (port->explicit_contract) {
3256                         typec_set_pwr_opmode(port->typec_port,
3257                                              TYPEC_PWR_MODE_PD);
3258                         port->pwr_opmode = TYPEC_PWR_MODE_PD;
3259                 }
3260
3261                 tcpm_swap_complete(port, 0);
3262                 tcpm_typec_connect(port);
3263                 tcpm_check_send_discover(port);
3264                 tcpm_pps_complete(port, port->pps_status);
3265
3266                 power_supply_changed(port->psy);
3267
3268                 break;
3269
3270         /* Accessory states */
3271         case ACC_UNATTACHED:
3272                 tcpm_acc_detach(port);
3273                 tcpm_set_state(port, SRC_UNATTACHED, 0);
3274                 break;
3275         case DEBUG_ACC_ATTACHED:
3276         case AUDIO_ACC_ATTACHED:
3277                 ret = tcpm_acc_attach(port);
3278                 if (ret < 0)
3279                         tcpm_set_state(port, ACC_UNATTACHED, 0);
3280                 break;
3281         case AUDIO_ACC_DEBOUNCE:
3282                 tcpm_set_state(port, ACC_UNATTACHED, PD_T_CC_DEBOUNCE);
3283                 break;
3284
3285         /* Hard_Reset states */
3286         case HARD_RESET_SEND:
3287                 tcpm_pd_transmit(port, TCPC_TX_HARD_RESET, NULL);
3288                 tcpm_set_state(port, HARD_RESET_START, 0);
3289                 break;
3290         case HARD_RESET_START:
3291                 port->hard_reset_count++;
3292                 port->tcpc->set_pd_rx(port->tcpc, false);
3293                 tcpm_unregister_altmodes(port);
3294                 port->send_discover = true;
3295                 if (port->pwr_role == TYPEC_SOURCE)
3296                         tcpm_set_state(port, SRC_HARD_RESET_VBUS_OFF,
3297                                        PD_T_PS_HARD_RESET);
3298                 else
3299                         tcpm_set_state(port, SNK_HARD_RESET_SINK_OFF, 0);
3300                 break;
3301         case SRC_HARD_RESET_VBUS_OFF:
3302                 tcpm_set_vconn(port, true);
3303                 tcpm_set_vbus(port, false);
3304                 tcpm_set_roles(port, port->self_powered, TYPEC_SOURCE,
3305                                TYPEC_HOST);
3306                 tcpm_set_state(port, SRC_HARD_RESET_VBUS_ON, PD_T_SRC_RECOVER);
3307                 break;
3308         case SRC_HARD_RESET_VBUS_ON:
3309                 tcpm_set_vbus(port, true);
3310                 port->tcpc->set_pd_rx(port->tcpc, true);
3311                 tcpm_set_attached_state(port, true);
3312                 tcpm_set_state(port, SRC_UNATTACHED, PD_T_PS_SOURCE_ON);
3313                 break;
3314         case SNK_HARD_RESET_SINK_OFF:
3315                 memset(&port->pps_data, 0, sizeof(port->pps_data));
3316                 tcpm_set_vconn(port, false);
3317                 if (port->pd_capable)
3318                         tcpm_set_charge(port, false);
3319                 tcpm_set_roles(port, port->self_powered, TYPEC_SINK,
3320                                TYPEC_DEVICE);
3321                 /*
3322                  * VBUS may or may not toggle, depending on the adapter.
3323                  * If it doesn't toggle, transition to SNK_HARD_RESET_SINK_ON
3324                  * directly after timeout.
3325                  */
3326                 tcpm_set_state(port, SNK_HARD_RESET_SINK_ON, PD_T_SAFE_0V);
3327                 break;
3328         case SNK_HARD_RESET_WAIT_VBUS:
3329                 /* Assume we're disconnected if VBUS doesn't come back. */
3330                 tcpm_set_state(port, SNK_UNATTACHED,
3331                                PD_T_SRC_RECOVER_MAX + PD_T_SRC_TURN_ON);
3332                 break;
3333         case SNK_HARD_RESET_SINK_ON:
3334                 /* Note: There is no guarantee that VBUS is on in this state */
3335                 /*
3336                  * XXX:
3337                  * The specification suggests that dual mode ports in sink
3338                  * mode should transition to state PE_SRC_Transition_to_default.
3339                  * See USB power delivery specification chapter 8.3.3.6.1.3.
3340                  * This would mean to to
3341                  * - turn off VCONN, reset power supply
3342                  * - request hardware reset
3343                  * - turn on VCONN
3344                  * - Transition to state PE_Src_Startup
3345                  * SNK only ports shall transition to state Snk_Startup
3346                  * (see chapter 8.3.3.3.8).
3347                  * Similar, dual-mode ports in source mode should transition
3348                  * to PE_SNK_Transition_to_default.
3349                  */
3350                 if (port->pd_capable) {
3351                         tcpm_set_current_limit(port,
3352                                                tcpm_get_current_limit(port),
3353                                                5000);
3354                         tcpm_set_charge(port, true);
3355                 }
3356                 tcpm_set_attached_state(port, true);
3357                 tcpm_set_state(port, SNK_STARTUP, 0);
3358                 break;
3359
3360         /* Soft_Reset states */
3361         case SOFT_RESET:
3362                 port->message_id = 0;
3363                 port->rx_msgid = -1;
3364                 tcpm_pd_send_control(port, PD_CTRL_ACCEPT);
3365                 if (port->pwr_role == TYPEC_SOURCE)
3366                         tcpm_set_state(port, SRC_SEND_CAPABILITIES, 0);
3367                 else
3368                         tcpm_set_state(port, SNK_WAIT_CAPABILITIES, 0);
3369                 break;
3370         case SOFT_RESET_SEND:
3371                 port->message_id = 0;
3372                 port->rx_msgid = -1;
3373                 if (tcpm_pd_send_control(port, PD_CTRL_SOFT_RESET))
3374                         tcpm_set_state_cond(port, hard_reset_state(port), 0);
3375                 else
3376                         tcpm_set_state_cond(port, hard_reset_state(port),
3377                                             PD_T_SENDER_RESPONSE);
3378                 break;
3379
3380         /* DR_Swap states */
3381         case DR_SWAP_SEND:
3382                 tcpm_pd_send_control(port, PD_CTRL_DR_SWAP);
3383                 tcpm_set_state_cond(port, DR_SWAP_SEND_TIMEOUT,
3384                                     PD_T_SENDER_RESPONSE);
3385                 break;
3386         case DR_SWAP_ACCEPT:
3387                 tcpm_pd_send_control(port, PD_CTRL_ACCEPT);
3388                 tcpm_set_state_cond(port, DR_SWAP_CHANGE_DR, 0);
3389                 break;
3390         case DR_SWAP_SEND_TIMEOUT:
3391                 tcpm_swap_complete(port, -ETIMEDOUT);
3392                 tcpm_set_state(port, ready_state(port), 0);
3393                 break;
3394         case DR_SWAP_CHANGE_DR:
3395                 if (port->data_role == TYPEC_HOST) {
3396                         tcpm_unregister_altmodes(port);
3397                         tcpm_set_roles(port, true, port->pwr_role,
3398                                        TYPEC_DEVICE);
3399                 } else {
3400                         tcpm_set_roles(port, true, port->pwr_role,
3401                                        TYPEC_HOST);
3402                         port->send_discover = true;
3403                 }
3404                 tcpm_set_state(port, ready_state(port), 0);
3405                 break;
3406
3407         /* PR_Swap states */
3408         case PR_SWAP_ACCEPT:
3409                 tcpm_pd_send_control(port, PD_CTRL_ACCEPT);
3410                 tcpm_set_state(port, PR_SWAP_START, 0);
3411                 break;
3412         case PR_SWAP_SEND:
3413                 tcpm_pd_send_control(port, PD_CTRL_PR_SWAP);
3414                 tcpm_set_state_cond(port, PR_SWAP_SEND_TIMEOUT,
3415                                     PD_T_SENDER_RESPONSE);
3416                 break;
3417         case PR_SWAP_SEND_TIMEOUT:
3418                 tcpm_swap_complete(port, -ETIMEDOUT);
3419                 tcpm_set_state(port, ready_state(port), 0);
3420                 break;
3421         case PR_SWAP_START:
3422                 if (port->pwr_role == TYPEC_SOURCE)
3423                         tcpm_set_state(port, PR_SWAP_SRC_SNK_TRANSITION_OFF,
3424                                        PD_T_SRC_TRANSITION);
3425                 else
3426                         tcpm_set_state(port, PR_SWAP_SNK_SRC_SINK_OFF, 0);
3427                 break;
3428         case PR_SWAP_SRC_SNK_TRANSITION_OFF:
3429                 tcpm_set_vbus(port, false);
3430                 port->explicit_contract = false;
3431                 /* allow time for Vbus discharge, must be < tSrcSwapStdby */
3432                 tcpm_set_state(port, PR_SWAP_SRC_SNK_SOURCE_OFF,
3433                                PD_T_SRCSWAPSTDBY);
3434                 break;
3435         case PR_SWAP_SRC_SNK_SOURCE_OFF:
3436                 tcpm_set_cc(port, TYPEC_CC_RD);
3437                 /* allow CC debounce */
3438                 tcpm_set_state(port, PR_SWAP_SRC_SNK_SOURCE_OFF_CC_DEBOUNCED,
3439                                PD_T_CC_DEBOUNCE);
3440                 break;
3441         case PR_SWAP_SRC_SNK_SOURCE_OFF_CC_DEBOUNCED:
3442                 /*
3443                  * USB-PD standard, 6.2.1.4, Port Power Role:
3444                  * "During the Power Role Swap Sequence, for the initial Source
3445                  * Port, the Port Power Role field shall be set to Sink in the
3446                  * PS_RDY Message indicating that the initial Source’s power
3447                  * supply is turned off"
3448                  */
3449                 tcpm_set_pwr_role(port, TYPEC_SINK);
3450                 if (tcpm_pd_send_control(port, PD_CTRL_PS_RDY)) {
3451                         tcpm_set_state(port, ERROR_RECOVERY, 0);
3452                         break;
3453                 }
3454                 tcpm_set_state_cond(port, SNK_UNATTACHED, PD_T_PS_SOURCE_ON);
3455                 break;
3456         case PR_SWAP_SRC_SNK_SINK_ON:
3457                 tcpm_set_state(port, SNK_STARTUP, 0);
3458                 break;
3459         case PR_SWAP_SNK_SRC_SINK_OFF:
3460                 tcpm_set_charge(port, false);
3461                 tcpm_set_state(port, hard_reset_state(port),
3462                                PD_T_PS_SOURCE_OFF);
3463                 break;
3464         case PR_SWAP_SNK_SRC_SOURCE_ON:
3465                 tcpm_set_cc(port, tcpm_rp_cc(port));
3466                 tcpm_set_vbus(port, true);
3467                 /*
3468                  * allow time VBUS ramp-up, must be < tNewSrc
3469                  * Also, this window overlaps with CC debounce as well.
3470                  * So, Wait for the max of two which is PD_T_NEWSRC
3471                  */
3472                 tcpm_set_state(port, PR_SWAP_SNK_SRC_SOURCE_ON_VBUS_RAMPED_UP,
3473                                PD_T_NEWSRC);
3474                 break;
3475         case PR_SWAP_SNK_SRC_SOURCE_ON_VBUS_RAMPED_UP:
3476                 /*
3477                  * USB PD standard, 6.2.1.4:
3478                  * "Subsequent Messages initiated by the Policy Engine,
3479                  * such as the PS_RDY Message sent to indicate that Vbus
3480                  * is ready, will have the Port Power Role field set to
3481                  * Source."
3482                  */
3483                 tcpm_set_pwr_role(port, TYPEC_SOURCE);
3484                 tcpm_pd_send_control(port, PD_CTRL_PS_RDY);
3485                 tcpm_set_state(port, SRC_STARTUP, 0);
3486                 break;
3487
3488         case VCONN_SWAP_ACCEPT:
3489                 tcpm_pd_send_control(port, PD_CTRL_ACCEPT);
3490                 tcpm_set_state(port, VCONN_SWAP_START, 0);
3491                 break;
3492         case VCONN_SWAP_SEND:
3493                 tcpm_pd_send_control(port, PD_CTRL_VCONN_SWAP);
3494                 tcpm_set_state(port, VCONN_SWAP_SEND_TIMEOUT,
3495                                PD_T_SENDER_RESPONSE);
3496                 break;
3497         case VCONN_SWAP_SEND_TIMEOUT:
3498                 tcpm_swap_complete(port, -ETIMEDOUT);
3499                 tcpm_set_state(port, ready_state(port), 0);
3500                 break;
3501         case VCONN_SWAP_START:
3502                 if (port->vconn_role == TYPEC_SOURCE)
3503                         tcpm_set_state(port, VCONN_SWAP_WAIT_FOR_VCONN, 0);
3504                 else
3505                         tcpm_set_state(port, VCONN_SWAP_TURN_ON_VCONN, 0);
3506                 break;
3507         case VCONN_SWAP_WAIT_FOR_VCONN:
3508                 tcpm_set_state(port, hard_reset_state(port),
3509                                PD_T_VCONN_SOURCE_ON);
3510                 break;
3511         case VCONN_SWAP_TURN_ON_VCONN:
3512                 tcpm_set_vconn(port, true);
3513                 tcpm_pd_send_control(port, PD_CTRL_PS_RDY);
3514                 tcpm_set_state(port, ready_state(port), 0);
3515                 break;
3516         case VCONN_SWAP_TURN_OFF_VCONN:
3517                 tcpm_set_vconn(port, false);
3518                 tcpm_set_state(port, ready_state(port), 0);
3519                 break;
3520
3521         case DR_SWAP_CANCEL:
3522         case PR_SWAP_CANCEL:
3523         case VCONN_SWAP_CANCEL:
3524                 tcpm_swap_complete(port, port->swap_status);
3525                 if (port->pwr_role == TYPEC_SOURCE)
3526                         tcpm_set_state(port, SRC_READY, 0);
3527                 else
3528                         tcpm_set_state(port, SNK_READY, 0);
3529                 break;
3530
3531         case BIST_RX:
3532                 switch (BDO_MODE_MASK(port->bist_request)) {
3533                 case BDO_MODE_CARRIER2:
3534                         tcpm_pd_transmit(port, TCPC_TX_BIST_MODE_2, NULL);
3535                         break;
3536                 default:
3537                         break;
3538                 }
3539                 /* Always switch to unattached state */
3540                 tcpm_set_state(port, unattached_state(port), 0);
3541                 break;
3542         case GET_STATUS_SEND:
3543                 tcpm_pd_send_control(port, PD_CTRL_GET_STATUS);
3544                 tcpm_set_state(port, GET_STATUS_SEND_TIMEOUT,
3545                                PD_T_SENDER_RESPONSE);
3546                 break;
3547         case GET_STATUS_SEND_TIMEOUT:
3548                 tcpm_set_state(port, ready_state(port), 0);
3549                 break;
3550         case GET_PPS_STATUS_SEND:
3551                 tcpm_pd_send_control(port, PD_CTRL_GET_PPS_STATUS);
3552                 tcpm_set_state(port, GET_PPS_STATUS_SEND_TIMEOUT,
3553                                PD_T_SENDER_RESPONSE);
3554                 break;
3555         case GET_PPS_STATUS_SEND_TIMEOUT:
3556                 tcpm_set_state(port, ready_state(port), 0);
3557                 break;
3558         case ERROR_RECOVERY:
3559                 tcpm_swap_complete(port, -EPROTO);
3560                 tcpm_pps_complete(port, -EPROTO);
3561                 tcpm_set_state(port, PORT_RESET, 0);
3562                 break;
3563         case PORT_RESET:
3564                 tcpm_reset_port(port);
3565                 tcpm_set_cc(port, TYPEC_CC_OPEN);
3566                 tcpm_set_state(port, PORT_RESET_WAIT_OFF,
3567                                PD_T_ERROR_RECOVERY);
3568                 break;
3569         case PORT_RESET_WAIT_OFF:
3570                 tcpm_set_state(port,
3571                                tcpm_default_state(port),
3572                                port->vbus_present ? PD_T_PS_SOURCE_OFF : 0);
3573                 break;
3574         default:
3575                 WARN(1, "Unexpected port state %d\n", port->state);
3576                 break;
3577         }
3578 }
3579
3580 static void tcpm_state_machine_work(struct work_struct *work)
3581 {
3582         struct tcpm_port *port = container_of(work, struct tcpm_port,
3583                                               state_machine.work);
3584         enum tcpm_state prev_state;
3585
3586         mutex_lock(&port->lock);
3587         port->state_machine_running = true;
3588
3589         if (port->queued_message && tcpm_send_queued_message(port))
3590                 goto done;
3591
3592         /* If we were queued due to a delayed state change, update it now */
3593         if (port->delayed_state) {
3594                 tcpm_log(port, "state change %s -> %s [delayed %ld ms]",
3595                          tcpm_states[port->state],
3596                          tcpm_states[port->delayed_state], port->delay_ms);
3597                 port->prev_state = port->state;
3598                 port->state = port->delayed_state;
3599                 port->delayed_state = INVALID_STATE;
3600         }
3601
3602         /*
3603          * Continue running as long as we have (non-delayed) state changes
3604          * to make.
3605          */
3606         do {
3607                 prev_state = port->state;
3608                 run_state_machine(port);
3609                 if (port->queued_message)
3610                         tcpm_send_queued_message(port);
3611         } while (port->state != prev_state && !port->delayed_state);
3612
3613 done:
3614         port->state_machine_running = false;
3615         mutex_unlock(&port->lock);
3616 }
3617
3618 static void _tcpm_cc_change(struct tcpm_port *port, enum typec_cc_status cc1,
3619                             enum typec_cc_status cc2)
3620 {
3621         enum typec_cc_status old_cc1, old_cc2;
3622         enum tcpm_state new_state;
3623
3624         old_cc1 = port->cc1;
3625         old_cc2 = port->cc2;
3626         port->cc1 = cc1;
3627         port->cc2 = cc2;
3628
3629         tcpm_log_force(port,
3630                        "CC1: %u -> %u, CC2: %u -> %u [state %s, polarity %d, %s]",
3631                        old_cc1, cc1, old_cc2, cc2, tcpm_states[port->state],
3632                        port->polarity,
3633                        tcpm_port_is_disconnected(port) ? "disconnected"
3634                                                        : "connected");
3635
3636         switch (port->state) {
3637         case TOGGLING:
3638                 if (tcpm_port_is_debug(port) || tcpm_port_is_audio(port) ||
3639                     tcpm_port_is_source(port))
3640                         tcpm_set_state(port, SRC_ATTACH_WAIT, 0);
3641                 else if (tcpm_port_is_sink(port))
3642                         tcpm_set_state(port, SNK_ATTACH_WAIT, 0);
3643                 break;
3644         case SRC_UNATTACHED:
3645         case ACC_UNATTACHED:
3646                 if (tcpm_port_is_debug(port) || tcpm_port_is_audio(port) ||
3647                     tcpm_port_is_source(port))
3648                         tcpm_set_state(port, SRC_ATTACH_WAIT, 0);
3649                 break;
3650         case SRC_ATTACH_WAIT:
3651                 if (tcpm_port_is_disconnected(port) ||
3652                     tcpm_port_is_audio_detached(port))
3653                         tcpm_set_state(port, SRC_UNATTACHED, 0);
3654                 else if (cc1 != old_cc1 || cc2 != old_cc2)
3655                         tcpm_set_state(port, SRC_ATTACH_WAIT, 0);
3656                 break;
3657         case SRC_ATTACHED:
3658         case SRC_SEND_CAPABILITIES:
3659         case SRC_READY:
3660                 if (tcpm_port_is_disconnected(port) ||
3661                     !tcpm_port_is_source(port))
3662                         tcpm_set_state(port, SRC_UNATTACHED, 0);
3663                 break;
3664         case SNK_UNATTACHED:
3665                 if (tcpm_port_is_sink(port))
3666                         tcpm_set_state(port, SNK_ATTACH_WAIT, 0);
3667                 break;
3668         case SNK_ATTACH_WAIT:
3669                 if ((port->cc1 == TYPEC_CC_OPEN &&
3670                      port->cc2 != TYPEC_CC_OPEN) ||
3671                     (port->cc1 != TYPEC_CC_OPEN &&
3672                      port->cc2 == TYPEC_CC_OPEN))
3673                         new_state = SNK_DEBOUNCED;
3674                 else if (tcpm_port_is_disconnected(port))
3675                         new_state = SNK_UNATTACHED;
3676                 else
3677                         break;
3678                 if (new_state != port->delayed_state)
3679                         tcpm_set_state(port, SNK_ATTACH_WAIT, 0);
3680                 break;
3681         case SNK_DEBOUNCED:
3682                 if (tcpm_port_is_disconnected(port))
3683                         new_state = SNK_UNATTACHED;
3684                 else if (port->vbus_present)
3685                         new_state = tcpm_try_src(port) ? SRC_TRY : SNK_ATTACHED;
3686                 else
3687                         new_state = SNK_UNATTACHED;
3688                 if (new_state != port->delayed_state)
3689                         tcpm_set_state(port, SNK_DEBOUNCED, 0);
3690                 break;
3691         case SNK_READY:
3692                 if (tcpm_port_is_disconnected(port))
3693                         tcpm_set_state(port, unattached_state(port), 0);
3694                 else if (!port->pd_capable &&
3695                          (cc1 != old_cc1 || cc2 != old_cc2))
3696                         tcpm_set_current_limit(port,
3697                                                tcpm_get_current_limit(port),
3698                                                5000);
3699                 break;
3700
3701         case AUDIO_ACC_ATTACHED:
3702                 if (cc1 == TYPEC_CC_OPEN || cc2 == TYPEC_CC_OPEN)
3703                         tcpm_set_state(port, AUDIO_ACC_DEBOUNCE, 0);
3704                 break;
3705         case AUDIO_ACC_DEBOUNCE:
3706                 if (tcpm_port_is_audio(port))
3707                         tcpm_set_state(port, AUDIO_ACC_ATTACHED, 0);
3708                 break;
3709
3710         case DEBUG_ACC_ATTACHED:
3711                 if (cc1 == TYPEC_CC_OPEN || cc2 == TYPEC_CC_OPEN)
3712                         tcpm_set_state(port, ACC_UNATTACHED, 0);
3713                 break;
3714
3715         case SNK_TRY:
3716                 /* Do nothing, waiting for timeout */
3717                 break;
3718
3719         case SNK_DISCOVERY:
3720                 /* CC line is unstable, wait for debounce */
3721                 if (tcpm_port_is_disconnected(port))
3722                         tcpm_set_state(port, SNK_DISCOVERY_DEBOUNCE, 0);
3723                 break;
3724         case SNK_DISCOVERY_DEBOUNCE:
3725                 break;
3726
3727         case SRC_TRYWAIT:
3728                 /* Hand over to state machine if needed */
3729                 if (!port->vbus_present && tcpm_port_is_source(port))
3730                         tcpm_set_state(port, SRC_TRYWAIT_DEBOUNCE, 0);
3731                 break;
3732         case SRC_TRYWAIT_DEBOUNCE:
3733                 if (port->vbus_present || !tcpm_port_is_source(port))
3734                         tcpm_set_state(port, SRC_TRYWAIT, 0);
3735                 break;
3736         case SNK_TRY_WAIT_DEBOUNCE:
3737                 if (!tcpm_port_is_sink(port)) {
3738                         port->max_wait = 0;
3739                         tcpm_set_state(port, SRC_TRYWAIT, 0);
3740                 }
3741                 break;
3742         case SRC_TRY_WAIT:
3743                 if (tcpm_port_is_source(port))
3744                         tcpm_set_state(port, SRC_TRY_DEBOUNCE, 0);
3745                 break;
3746         case SRC_TRY_DEBOUNCE:
3747                 tcpm_set_state(port, SRC_TRY_WAIT, 0);
3748                 break;
3749         case SNK_TRYWAIT_DEBOUNCE:
3750                 if (tcpm_port_is_sink(port))
3751                         tcpm_set_state(port, SNK_TRYWAIT_VBUS, 0);
3752                 break;
3753         case SNK_TRYWAIT_VBUS:
3754                 if (!tcpm_port_is_sink(port))
3755                         tcpm_set_state(port, SNK_TRYWAIT_DEBOUNCE, 0);
3756                 break;
3757         case SNK_TRYWAIT:
3758                 /* Do nothing, waiting for tCCDebounce */
3759                 break;
3760         case PR_SWAP_SNK_SRC_SINK_OFF:
3761         case PR_SWAP_SRC_SNK_TRANSITION_OFF:
3762         case PR_SWAP_SRC_SNK_SOURCE_OFF:
3763         case PR_SWAP_SRC_SNK_SOURCE_OFF_CC_DEBOUNCED:
3764         case PR_SWAP_SNK_SRC_SOURCE_ON:
3765                 /*
3766                  * CC state change is expected in PR_SWAP
3767                  * Ignore it.
3768                  */
3769                 break;
3770
3771         case PORT_RESET:
3772         case PORT_RESET_WAIT_OFF:
3773                 /*
3774                  * State set back to default mode once the timer completes.
3775                  * Ignore CC changes here.
3776                  */
3777                 break;
3778
3779         default:
3780                 if (tcpm_port_is_disconnected(port))
3781                         tcpm_set_state(port, unattached_state(port), 0);
3782                 break;
3783         }
3784 }
3785
3786 static void _tcpm_pd_vbus_on(struct tcpm_port *port)
3787 {
3788         tcpm_log_force(port, "VBUS on");
3789         port->vbus_present = true;
3790         switch (port->state) {
3791         case SNK_TRANSITION_SINK_VBUS:
3792                 port->explicit_contract = true;
3793                 tcpm_set_state(port, SNK_READY, 0);
3794                 break;
3795         case SNK_DISCOVERY:
3796                 tcpm_set_state(port, SNK_DISCOVERY, 0);
3797                 break;
3798
3799         case SNK_DEBOUNCED:
3800                 tcpm_set_state(port, tcpm_try_src(port) ? SRC_TRY
3801                                                         : SNK_ATTACHED,
3802                                        0);
3803                 break;
3804         case SNK_HARD_RESET_WAIT_VBUS:
3805                 tcpm_set_state(port, SNK_HARD_RESET_SINK_ON, 0);
3806                 break;
3807         case SRC_ATTACHED:
3808                 tcpm_set_state(port, SRC_STARTUP, 0);
3809                 break;
3810         case SRC_HARD_RESET_VBUS_ON:
3811                 tcpm_set_state(port, SRC_STARTUP, 0);
3812                 break;
3813
3814         case SNK_TRY:
3815                 /* Do nothing, waiting for timeout */
3816                 break;
3817         case SRC_TRYWAIT:
3818                 /* Do nothing, Waiting for Rd to be detected */
3819                 break;
3820         case SRC_TRYWAIT_DEBOUNCE:
3821                 tcpm_set_state(port, SRC_TRYWAIT, 0);
3822                 break;
3823         case SNK_TRY_WAIT_DEBOUNCE:
3824                 /* Do nothing, waiting for PD_DEBOUNCE to do be done */
3825                 break;
3826         case SNK_TRYWAIT:
3827                 /* Do nothing, waiting for tCCDebounce */
3828                 break;
3829         case SNK_TRYWAIT_VBUS:
3830                 if (tcpm_port_is_sink(port))
3831                         tcpm_set_state(port, SNK_ATTACHED, 0);
3832                 break;
3833         case SNK_TRYWAIT_DEBOUNCE:
3834                 /* Do nothing, waiting for Rp */
3835                 break;
3836         case SRC_TRY_WAIT:
3837         case SRC_TRY_DEBOUNCE:
3838                 /* Do nothing, waiting for sink detection */
3839                 break;
3840
3841         case PORT_RESET:
3842         case PORT_RESET_WAIT_OFF:
3843                 /*
3844                  * State set back to default mode once the timer completes.
3845                  * Ignore vbus changes here.
3846                  */
3847                 break;
3848
3849         default:
3850                 break;
3851         }
3852 }
3853
3854 static void _tcpm_pd_vbus_off(struct tcpm_port *port)
3855 {
3856         tcpm_log_force(port, "VBUS off");
3857         port->vbus_present = false;
3858         port->vbus_never_low = false;
3859         switch (port->state) {
3860         case SNK_HARD_RESET_SINK_OFF:
3861                 tcpm_set_state(port, SNK_HARD_RESET_WAIT_VBUS, 0);
3862                 break;
3863         case SRC_HARD_RESET_VBUS_OFF:
3864                 tcpm_set_state(port, SRC_HARD_RESET_VBUS_ON, 0);
3865                 break;
3866         case HARD_RESET_SEND:
3867                 break;
3868
3869         case SNK_TRY:
3870                 /* Do nothing, waiting for timeout */
3871                 break;
3872         case SRC_TRYWAIT:
3873                 /* Hand over to state machine if needed */
3874                 if (tcpm_port_is_source(port))
3875                         tcpm_set_state(port, SRC_TRYWAIT_DEBOUNCE, 0);
3876                 break;
3877         case SNK_TRY_WAIT_DEBOUNCE:
3878                 /* Do nothing, waiting for PD_DEBOUNCE to do be done */
3879                 break;
3880         case SNK_TRYWAIT:
3881         case SNK_TRYWAIT_VBUS:
3882         case SNK_TRYWAIT_DEBOUNCE:
3883                 break;
3884         case SNK_ATTACH_WAIT:
3885                 tcpm_set_state(port, SNK_UNATTACHED, 0);
3886                 break;
3887
3888         case SNK_NEGOTIATE_CAPABILITIES:
3889                 break;
3890
3891         case PR_SWAP_SRC_SNK_TRANSITION_OFF:
3892                 tcpm_set_state(port, PR_SWAP_SRC_SNK_SOURCE_OFF, 0);
3893                 break;
3894
3895         case PR_SWAP_SNK_SRC_SINK_OFF:
3896                 /* Do nothing, expected */
3897                 break;
3898
3899         case PORT_RESET_WAIT_OFF:
3900                 tcpm_set_state(port, tcpm_default_state(port), 0);
3901                 break;
3902
3903         case SRC_TRY_WAIT:
3904         case SRC_TRY_DEBOUNCE:
3905                 /* Do nothing, waiting for sink detection */
3906                 break;
3907
3908         case PORT_RESET:
3909                 /*
3910                  * State set back to default mode once the timer completes.
3911                  * Ignore vbus changes here.
3912                  */
3913                 break;
3914
3915         default:
3916                 if (port->pwr_role == TYPEC_SINK &&
3917                     port->attached)
3918                         tcpm_set_state(port, SNK_UNATTACHED, 0);
3919                 break;
3920         }
3921 }
3922
3923 static void _tcpm_pd_hard_reset(struct tcpm_port *port)
3924 {
3925         tcpm_log_force(port, "Received hard reset");
3926         /*
3927          * If we keep receiving hard reset requests, executing the hard reset
3928          * must have failed. Revert to error recovery if that happens.
3929          */
3930         tcpm_set_state(port,
3931                        port->hard_reset_count < PD_N_HARD_RESET_COUNT ?
3932                                 HARD_RESET_START : ERROR_RECOVERY,
3933                        0);
3934 }
3935
3936 static void tcpm_pd_event_handler(struct work_struct *work)
3937 {
3938         struct tcpm_port *port = container_of(work, struct tcpm_port,
3939                                               event_work);
3940         u32 events;
3941
3942         mutex_lock(&port->lock);
3943
3944         spin_lock(&port->pd_event_lock);
3945         while (port->pd_events) {
3946                 events = port->pd_events;
3947                 port->pd_events = 0;
3948                 spin_unlock(&port->pd_event_lock);
3949                 if (events & TCPM_RESET_EVENT)
3950                         _tcpm_pd_hard_reset(port);
3951                 if (events & TCPM_VBUS_EVENT) {
3952                         bool vbus;
3953
3954                         vbus = port->tcpc->get_vbus(port->tcpc);
3955                         if (vbus)
3956                                 _tcpm_pd_vbus_on(port);
3957                         else
3958                                 _tcpm_pd_vbus_off(port);
3959                 }
3960                 if (events & TCPM_CC_EVENT) {
3961                         enum typec_cc_status cc1, cc2;
3962
3963                         if (port->tcpc->get_cc(port->tcpc, &cc1, &cc2) == 0)
3964                                 _tcpm_cc_change(port, cc1, cc2);
3965                 }
3966                 spin_lock(&port->pd_event_lock);
3967         }
3968         spin_unlock(&port->pd_event_lock);
3969         mutex_unlock(&port->lock);
3970 }
3971
3972 void tcpm_cc_change(struct tcpm_port *port)
3973 {
3974         spin_lock(&port->pd_event_lock);
3975         port->pd_events |= TCPM_CC_EVENT;
3976         spin_unlock(&port->pd_event_lock);
3977         queue_work(port->wq, &port->event_work);
3978 }
3979 EXPORT_SYMBOL_GPL(tcpm_cc_change);
3980
3981 void tcpm_vbus_change(struct tcpm_port *port)
3982 {
3983         spin_lock(&port->pd_event_lock);
3984         port->pd_events |= TCPM_VBUS_EVENT;
3985         spin_unlock(&port->pd_event_lock);
3986         queue_work(port->wq, &port->event_work);
3987 }
3988 EXPORT_SYMBOL_GPL(tcpm_vbus_change);
3989
3990 void tcpm_pd_hard_reset(struct tcpm_port *port)
3991 {
3992         spin_lock(&port->pd_event_lock);
3993         port->pd_events = TCPM_RESET_EVENT;
3994         spin_unlock(&port->pd_event_lock);
3995         queue_work(port->wq, &port->event_work);
3996 }
3997 EXPORT_SYMBOL_GPL(tcpm_pd_hard_reset);
3998
3999 static int tcpm_dr_set(const struct typec_capability *cap,
4000                        enum typec_data_role data)
4001 {
4002         struct tcpm_port *port = typec_cap_to_tcpm(cap);
4003         int ret;
4004
4005         mutex_lock(&port->swap_lock);
4006         mutex_lock(&port->lock);
4007
4008         if (port->port_type != TYPEC_PORT_DRP) {
4009                 ret = -EINVAL;
4010                 goto port_unlock;
4011         }
4012         if (port->state != SRC_READY && port->state != SNK_READY) {
4013                 ret = -EAGAIN;
4014                 goto port_unlock;
4015         }
4016
4017         if (port->data_role == data) {
4018                 ret = 0;
4019                 goto port_unlock;
4020         }
4021
4022         /*
4023          * XXX
4024          * 6.3.9: If an alternate mode is active, a request to swap
4025          * alternate modes shall trigger a port reset.
4026          * Reject data role swap request in this case.
4027          */
4028
4029         if (!port->pd_capable) {
4030                 /*
4031                  * If the partner is not PD capable, reset the port to
4032                  * trigger a role change. This can only work if a preferred
4033                  * role is configured, and if it matches the requested role.
4034                  */
4035                 if (port->try_role == TYPEC_NO_PREFERRED_ROLE ||
4036                     port->try_role == port->pwr_role) {
4037                         ret = -EINVAL;
4038                         goto port_unlock;
4039                 }
4040                 port->non_pd_role_swap = true;
4041                 tcpm_set_state(port, PORT_RESET, 0);
4042         } else {
4043                 tcpm_set_state(port, DR_SWAP_SEND, 0);
4044         }
4045
4046         port->swap_status = 0;
4047         port->swap_pending = true;
4048         reinit_completion(&port->swap_complete);
4049         mutex_unlock(&port->lock);
4050
4051         if (!wait_for_completion_timeout(&port->swap_complete,
4052                                 msecs_to_jiffies(PD_ROLE_SWAP_TIMEOUT)))
4053                 ret = -ETIMEDOUT;
4054         else
4055                 ret = port->swap_status;
4056
4057         port->non_pd_role_swap = false;
4058         goto swap_unlock;
4059
4060 port_unlock:
4061         mutex_unlock(&port->lock);
4062 swap_unlock:
4063         mutex_unlock(&port->swap_lock);
4064         return ret;
4065 }
4066
4067 static int tcpm_pr_set(const struct typec_capability *cap,
4068                        enum typec_role role)
4069 {
4070         struct tcpm_port *port = typec_cap_to_tcpm(cap);
4071         int ret;
4072
4073         mutex_lock(&port->swap_lock);
4074         mutex_lock(&port->lock);
4075
4076         if (port->port_type != TYPEC_PORT_DRP) {
4077                 ret = -EINVAL;
4078                 goto port_unlock;
4079         }
4080         if (port->state != SRC_READY && port->state != SNK_READY) {
4081                 ret = -EAGAIN;
4082                 goto port_unlock;
4083         }
4084
4085         if (role == port->pwr_role) {
4086                 ret = 0;
4087                 goto port_unlock;
4088         }
4089
4090         port->swap_status = 0;
4091         port->swap_pending = true;
4092         reinit_completion(&port->swap_complete);
4093         tcpm_set_state(port, PR_SWAP_SEND, 0);
4094         mutex_unlock(&port->lock);
4095
4096         if (!wait_for_completion_timeout(&port->swap_complete,
4097                                 msecs_to_jiffies(PD_ROLE_SWAP_TIMEOUT)))
4098                 ret = -ETIMEDOUT;
4099         else
4100                 ret = port->swap_status;
4101
4102         goto swap_unlock;
4103
4104 port_unlock:
4105         mutex_unlock(&port->lock);
4106 swap_unlock:
4107         mutex_unlock(&port->swap_lock);
4108         return ret;
4109 }
4110
4111 static int tcpm_vconn_set(const struct typec_capability *cap,
4112                           enum typec_role role)
4113 {
4114         struct tcpm_port *port = typec_cap_to_tcpm(cap);
4115         int ret;
4116
4117         mutex_lock(&port->swap_lock);
4118         mutex_lock(&port->lock);
4119
4120         if (port->state != SRC_READY && port->state != SNK_READY) {
4121                 ret = -EAGAIN;
4122                 goto port_unlock;
4123         }
4124
4125         if (role == port->vconn_role) {
4126                 ret = 0;
4127                 goto port_unlock;
4128         }
4129
4130         port->swap_status = 0;
4131         port->swap_pending = true;
4132         reinit_completion(&port->swap_complete);
4133         tcpm_set_state(port, VCONN_SWAP_SEND, 0);
4134         mutex_unlock(&port->lock);
4135
4136         if (!wait_for_completion_timeout(&port->swap_complete,
4137                                 msecs_to_jiffies(PD_ROLE_SWAP_TIMEOUT)))
4138                 ret = -ETIMEDOUT;
4139         else
4140                 ret = port->swap_status;
4141
4142         goto swap_unlock;
4143
4144 port_unlock:
4145         mutex_unlock(&port->lock);
4146 swap_unlock:
4147         mutex_unlock(&port->swap_lock);
4148         return ret;
4149 }
4150
4151 static int tcpm_try_role(const struct typec_capability *cap, int role)
4152 {
4153         struct tcpm_port *port = typec_cap_to_tcpm(cap);
4154         struct tcpc_dev *tcpc = port->tcpc;
4155         int ret = 0;
4156
4157         mutex_lock(&port->lock);
4158         if (tcpc->try_role)
4159                 ret = tcpc->try_role(tcpc, role);
4160         if (!ret && (!tcpc->config || !tcpc->config->try_role_hw))
4161                 port->try_role = role;
4162         port->try_src_count = 0;
4163         port->try_snk_count = 0;
4164         mutex_unlock(&port->lock);
4165
4166         return ret;
4167 }
4168
4169 static int tcpm_pps_set_op_curr(struct tcpm_port *port, u16 op_curr)
4170 {
4171         unsigned int target_mw;
4172         int ret;
4173
4174         mutex_lock(&port->swap_lock);
4175         mutex_lock(&port->lock);
4176
4177         if (!port->pps_data.active) {
4178                 ret = -EOPNOTSUPP;
4179                 goto port_unlock;
4180         }
4181
4182         if (port->state != SNK_READY) {
4183                 ret = -EAGAIN;
4184                 goto port_unlock;
4185         }
4186
4187         if (op_curr > port->pps_data.max_curr) {
4188                 ret = -EINVAL;
4189                 goto port_unlock;
4190         }
4191
4192         target_mw = (op_curr * port->pps_data.out_volt) / 1000;
4193         if (target_mw < port->operating_snk_mw) {
4194                 ret = -EINVAL;
4195                 goto port_unlock;
4196         }
4197
4198         /* Round down operating current to align with PPS valid steps */
4199         op_curr = op_curr - (op_curr % RDO_PROG_CURR_MA_STEP);
4200
4201         reinit_completion(&port->pps_complete);
4202         port->pps_data.op_curr = op_curr;
4203         port->pps_status = 0;
4204         port->pps_pending = true;
4205         tcpm_set_state(port, SNK_NEGOTIATE_PPS_CAPABILITIES, 0);
4206         mutex_unlock(&port->lock);
4207
4208         if (!wait_for_completion_timeout(&port->pps_complete,
4209                                 msecs_to_jiffies(PD_PPS_CTRL_TIMEOUT)))
4210                 ret = -ETIMEDOUT;
4211         else
4212                 ret = port->pps_status;
4213
4214         goto swap_unlock;
4215
4216 port_unlock:
4217         mutex_unlock(&port->lock);
4218 swap_unlock:
4219         mutex_unlock(&port->swap_lock);
4220
4221         return ret;
4222 }
4223
4224 static int tcpm_pps_set_out_volt(struct tcpm_port *port, u16 out_volt)
4225 {
4226         unsigned int target_mw;
4227         int ret;
4228
4229         mutex_lock(&port->swap_lock);
4230         mutex_lock(&port->lock);
4231
4232         if (!port->pps_data.active) {
4233                 ret = -EOPNOTSUPP;
4234                 goto port_unlock;
4235         }
4236
4237         if (port->state != SNK_READY) {
4238                 ret = -EAGAIN;
4239                 goto port_unlock;
4240         }
4241
4242         if (out_volt < port->pps_data.min_volt ||
4243             out_volt > port->pps_data.max_volt) {
4244                 ret = -EINVAL;
4245                 goto port_unlock;
4246         }
4247
4248         target_mw = (port->pps_data.op_curr * out_volt) / 1000;
4249         if (target_mw < port->operating_snk_mw) {
4250                 ret = -EINVAL;
4251                 goto port_unlock;
4252         }
4253
4254         /* Round down output voltage to align with PPS valid steps */
4255         out_volt = out_volt - (out_volt % RDO_PROG_VOLT_MV_STEP);
4256
4257         reinit_completion(&port->pps_complete);
4258         port->pps_data.out_volt = out_volt;
4259         port->pps_status = 0;
4260         port->pps_pending = true;
4261         tcpm_set_state(port, SNK_NEGOTIATE_PPS_CAPABILITIES, 0);
4262         mutex_unlock(&port->lock);
4263
4264         if (!wait_for_completion_timeout(&port->pps_complete,
4265                                 msecs_to_jiffies(PD_PPS_CTRL_TIMEOUT)))
4266                 ret = -ETIMEDOUT;
4267         else
4268                 ret = port->pps_status;
4269
4270         goto swap_unlock;
4271
4272 port_unlock:
4273         mutex_unlock(&port->lock);
4274 swap_unlock:
4275         mutex_unlock(&port->swap_lock);
4276
4277         return ret;
4278 }
4279
4280 static int tcpm_pps_activate(struct tcpm_port *port, bool activate)
4281 {
4282         int ret = 0;
4283
4284         mutex_lock(&port->swap_lock);
4285         mutex_lock(&port->lock);
4286
4287         if (!port->pps_data.supported) {
4288                 ret = -EOPNOTSUPP;
4289                 goto port_unlock;
4290         }
4291
4292         /* Trying to deactivate PPS when already deactivated so just bail */
4293         if (!port->pps_data.active && !activate)
4294                 goto port_unlock;
4295
4296         if (port->state != SNK_READY) {
4297                 ret = -EAGAIN;
4298                 goto port_unlock;
4299         }
4300
4301         reinit_completion(&port->pps_complete);
4302         port->pps_status = 0;
4303         port->pps_pending = true;
4304
4305         /* Trigger PPS request or move back to standard PDO contract */
4306         if (activate) {
4307                 port->pps_data.out_volt = port->supply_voltage;
4308                 port->pps_data.op_curr = port->current_limit;
4309                 tcpm_set_state(port, SNK_NEGOTIATE_PPS_CAPABILITIES, 0);
4310         } else {
4311                 tcpm_set_state(port, SNK_NEGOTIATE_CAPABILITIES, 0);
4312         }
4313         mutex_unlock(&port->lock);
4314
4315         if (!wait_for_completion_timeout(&port->pps_complete,
4316                                 msecs_to_jiffies(PD_PPS_CTRL_TIMEOUT)))
4317                 ret = -ETIMEDOUT;
4318         else
4319                 ret = port->pps_status;
4320
4321         goto swap_unlock;
4322
4323 port_unlock:
4324         mutex_unlock(&port->lock);
4325 swap_unlock:
4326         mutex_unlock(&port->swap_lock);
4327
4328         return ret;
4329 }
4330
4331 static void tcpm_init(struct tcpm_port *port)
4332 {
4333         enum typec_cc_status cc1, cc2;
4334
4335         port->tcpc->init(port->tcpc);
4336
4337         tcpm_reset_port(port);
4338
4339         /*
4340          * XXX
4341          * Should possibly wait for VBUS to settle if it was enabled locally
4342          * since tcpm_reset_port() will disable VBUS.
4343          */
4344         port->vbus_present = port->tcpc->get_vbus(port->tcpc);
4345         if (port->vbus_present)
4346                 port->vbus_never_low = true;
4347
4348         tcpm_set_state(port, tcpm_default_state(port), 0);
4349
4350         if (port->tcpc->get_cc(port->tcpc, &cc1, &cc2) == 0)
4351                 _tcpm_cc_change(port, cc1, cc2);
4352
4353         /*
4354          * Some adapters need a clean slate at startup, and won't recover
4355          * otherwise. So do not try to be fancy and force a clean disconnect.
4356          */
4357         tcpm_set_state(port, PORT_RESET, 0);
4358 }
4359
4360 static int tcpm_port_type_set(const struct typec_capability *cap,
4361                               enum typec_port_type type)
4362 {
4363         struct tcpm_port *port = typec_cap_to_tcpm(cap);
4364
4365         mutex_lock(&port->lock);
4366         if (type == port->port_type)
4367                 goto port_unlock;
4368
4369         port->port_type = type;
4370
4371         if (!port->connected) {
4372                 tcpm_set_state(port, PORT_RESET, 0);
4373         } else if (type == TYPEC_PORT_SNK) {
4374                 if (!(port->pwr_role == TYPEC_SINK &&
4375                       port->data_role == TYPEC_DEVICE))
4376                         tcpm_set_state(port, PORT_RESET, 0);
4377         } else if (type == TYPEC_PORT_SRC) {
4378                 if (!(port->pwr_role == TYPEC_SOURCE &&
4379                       port->data_role == TYPEC_HOST))
4380                         tcpm_set_state(port, PORT_RESET, 0);
4381         }
4382
4383 port_unlock:
4384         mutex_unlock(&port->lock);
4385         return 0;
4386 }
4387
4388 void tcpm_tcpc_reset(struct tcpm_port *port)
4389 {
4390         mutex_lock(&port->lock);
4391         /* XXX: Maintain PD connection if possible? */
4392         tcpm_init(port);
4393         mutex_unlock(&port->lock);
4394 }
4395 EXPORT_SYMBOL_GPL(tcpm_tcpc_reset);
4396
4397 static int tcpm_copy_pdos(u32 *dest_pdo, const u32 *src_pdo,
4398                           unsigned int nr_pdo)
4399 {
4400         unsigned int i;
4401
4402         if (nr_pdo > PDO_MAX_OBJECTS)
4403                 nr_pdo = PDO_MAX_OBJECTS;
4404
4405         for (i = 0; i < nr_pdo; i++)
4406                 dest_pdo[i] = src_pdo[i];
4407
4408         return nr_pdo;
4409 }
4410
4411 static int tcpm_copy_vdos(u32 *dest_vdo, const u32 *src_vdo,
4412                           unsigned int nr_vdo)
4413 {
4414         unsigned int i;
4415
4416         if (nr_vdo > VDO_MAX_OBJECTS)
4417                 nr_vdo = VDO_MAX_OBJECTS;
4418
4419         for (i = 0; i < nr_vdo; i++)
4420                 dest_vdo[i] = src_vdo[i];
4421
4422         return nr_vdo;
4423 }
4424
4425 static int tcpm_fw_get_caps(struct tcpm_port *port,
4426                             struct fwnode_handle *fwnode)
4427 {
4428         const char *cap_str;
4429         int ret;
4430         u32 mw;
4431
4432         if (!fwnode)
4433                 return -EINVAL;
4434
4435         /* USB data support is optional */
4436         ret = fwnode_property_read_string(fwnode, "data-role", &cap_str);
4437         if (ret == 0) {
4438                 ret = typec_find_port_data_role(cap_str);
4439                 if (ret < 0)
4440                         return ret;
4441                 port->typec_caps.data = ret;
4442         }
4443
4444         ret = fwnode_property_read_string(fwnode, "power-role", &cap_str);
4445         if (ret < 0)
4446                 return ret;
4447
4448         ret = typec_find_port_power_role(cap_str);
4449         if (ret < 0)
4450                 return ret;
4451         port->typec_caps.type = ret;
4452         port->port_type = port->typec_caps.type;
4453
4454         if (port->port_type == TYPEC_PORT_SNK)
4455                 goto sink;
4456
4457         /* Get source pdos */
4458         ret = fwnode_property_count_u32(fwnode, "source-pdos");
4459         if (ret <= 0)
4460                 return -EINVAL;
4461
4462         port->nr_src_pdo = min(ret, PDO_MAX_OBJECTS);
4463         ret = fwnode_property_read_u32_array(fwnode, "source-pdos",
4464                                              port->src_pdo, port->nr_src_pdo);
4465         if ((ret < 0) || tcpm_validate_caps(port, port->src_pdo,
4466                                             port->nr_src_pdo))
4467                 return -EINVAL;
4468
4469         if (port->port_type == TYPEC_PORT_SRC)
4470                 return 0;
4471
4472         /* Get the preferred power role for DRP */
4473         ret = fwnode_property_read_string(fwnode, "try-power-role", &cap_str);
4474         if (ret < 0)
4475                 return ret;
4476
4477         port->typec_caps.prefer_role = typec_find_power_role(cap_str);
4478         if (port->typec_caps.prefer_role < 0)
4479                 return -EINVAL;
4480 sink:
4481         /* Get sink pdos */
4482         ret = fwnode_property_count_u32(fwnode, "sink-pdos");
4483         if (ret <= 0)
4484                 return -EINVAL;
4485
4486         port->nr_snk_pdo = min(ret, PDO_MAX_OBJECTS);
4487         ret = fwnode_property_read_u32_array(fwnode, "sink-pdos",
4488                                              port->snk_pdo, port->nr_snk_pdo);
4489         if ((ret < 0) || tcpm_validate_caps(port, port->snk_pdo,
4490                                             port->nr_snk_pdo))
4491                 return -EINVAL;
4492
4493         if (fwnode_property_read_u32(fwnode, "op-sink-microwatt", &mw) < 0)
4494                 return -EINVAL;
4495         port->operating_snk_mw = mw / 1000;
4496
4497         port->self_powered = fwnode_property_read_bool(fwnode, "self-powered");
4498
4499         return 0;
4500 }
4501
4502 /* Power Supply access to expose source power information */
4503 enum tcpm_psy_online_states {
4504         TCPM_PSY_OFFLINE = 0,
4505         TCPM_PSY_FIXED_ONLINE,
4506         TCPM_PSY_PROG_ONLINE,
4507 };
4508
4509 static enum power_supply_property tcpm_psy_props[] = {
4510         POWER_SUPPLY_PROP_USB_TYPE,
4511         POWER_SUPPLY_PROP_ONLINE,
4512         POWER_SUPPLY_PROP_VOLTAGE_MIN,
4513         POWER_SUPPLY_PROP_VOLTAGE_MAX,
4514         POWER_SUPPLY_PROP_VOLTAGE_NOW,
4515         POWER_SUPPLY_PROP_CURRENT_MAX,
4516         POWER_SUPPLY_PROP_CURRENT_NOW,
4517 };
4518
4519 static int tcpm_psy_get_online(struct tcpm_port *port,
4520                                union power_supply_propval *val)
4521 {
4522         if (port->vbus_charge) {
4523                 if (port->pps_data.active)
4524                         val->intval = TCPM_PSY_PROG_ONLINE;
4525                 else
4526                         val->intval = TCPM_PSY_FIXED_ONLINE;
4527         } else {
4528                 val->intval = TCPM_PSY_OFFLINE;
4529         }
4530
4531         return 0;
4532 }
4533
4534 static int tcpm_psy_get_voltage_min(struct tcpm_port *port,
4535                                     union power_supply_propval *val)
4536 {
4537         if (port->pps_data.active)
4538                 val->intval = port->pps_data.min_volt * 1000;
4539         else
4540                 val->intval = port->supply_voltage * 1000;
4541
4542         return 0;
4543 }
4544
4545 static int tcpm_psy_get_voltage_max(struct tcpm_port *port,
4546                                     union power_supply_propval *val)
4547 {
4548         if (port->pps_data.active)
4549                 val->intval = port->pps_data.max_volt * 1000;
4550         else
4551                 val->intval = port->supply_voltage * 1000;
4552
4553         return 0;
4554 }
4555
4556 static int tcpm_psy_get_voltage_now(struct tcpm_port *port,
4557                                     union power_supply_propval *val)
4558 {
4559         val->intval = port->supply_voltage * 1000;
4560
4561         return 0;
4562 }
4563
4564 static int tcpm_psy_get_current_max(struct tcpm_port *port,
4565                                     union power_supply_propval *val)
4566 {
4567         if (port->pps_data.active)
4568                 val->intval = port->pps_data.max_curr * 1000;
4569         else
4570                 val->intval = port->current_limit * 1000;
4571
4572         return 0;
4573 }
4574
4575 static int tcpm_psy_get_current_now(struct tcpm_port *port,
4576                                     union power_supply_propval *val)
4577 {
4578         val->intval = port->current_limit * 1000;
4579
4580         return 0;
4581 }
4582
4583 static int tcpm_psy_get_prop(struct power_supply *psy,
4584                              enum power_supply_property psp,
4585                              union power_supply_propval *val)
4586 {
4587         struct tcpm_port *port = power_supply_get_drvdata(psy);
4588         int ret = 0;
4589
4590         switch (psp) {
4591         case POWER_SUPPLY_PROP_USB_TYPE:
4592                 val->intval = port->usb_type;
4593                 break;
4594         case POWER_SUPPLY_PROP_ONLINE:
4595                 ret = tcpm_psy_get_online(port, val);
4596                 break;
4597         case POWER_SUPPLY_PROP_VOLTAGE_MIN:
4598                 ret = tcpm_psy_get_voltage_min(port, val);
4599                 break;
4600         case POWER_SUPPLY_PROP_VOLTAGE_MAX:
4601                 ret = tcpm_psy_get_voltage_max(port, val);
4602                 break;
4603         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
4604                 ret = tcpm_psy_get_voltage_now(port, val);
4605                 break;
4606         case POWER_SUPPLY_PROP_CURRENT_MAX:
4607                 ret = tcpm_psy_get_current_max(port, val);
4608                 break;
4609         case POWER_SUPPLY_PROP_CURRENT_NOW:
4610                 ret = tcpm_psy_get_current_now(port, val);
4611                 break;
4612         default:
4613                 ret = -EINVAL;
4614                 break;
4615         }
4616
4617         return ret;
4618 }
4619
4620 static int tcpm_psy_set_online(struct tcpm_port *port,
4621                                const union power_supply_propval *val)
4622 {
4623         int ret;
4624
4625         switch (val->intval) {
4626         case TCPM_PSY_FIXED_ONLINE:
4627                 ret = tcpm_pps_activate(port, false);
4628                 break;
4629         case TCPM_PSY_PROG_ONLINE:
4630                 ret = tcpm_pps_activate(port, true);
4631                 break;
4632         default:
4633                 ret = -EINVAL;
4634                 break;
4635         }
4636
4637         return ret;
4638 }
4639
4640 static int tcpm_psy_set_prop(struct power_supply *psy,
4641                              enum power_supply_property psp,
4642                              const union power_supply_propval *val)
4643 {
4644         struct tcpm_port *port = power_supply_get_drvdata(psy);
4645         int ret;
4646
4647         switch (psp) {
4648         case POWER_SUPPLY_PROP_ONLINE:
4649                 ret = tcpm_psy_set_online(port, val);
4650                 break;
4651         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
4652                 if (val->intval < port->pps_data.min_volt * 1000 ||
4653                     val->intval > port->pps_data.max_volt * 1000)
4654                         ret = -EINVAL;
4655                 else
4656                         ret = tcpm_pps_set_out_volt(port, val->intval / 1000);
4657                 break;
4658         case POWER_SUPPLY_PROP_CURRENT_NOW:
4659                 if (val->intval > port->pps_data.max_curr * 1000)
4660                         ret = -EINVAL;
4661                 else
4662                         ret = tcpm_pps_set_op_curr(port, val->intval / 1000);
4663                 break;
4664         default:
4665                 ret = -EINVAL;
4666                 break;
4667         }
4668
4669         return ret;
4670 }
4671
4672 static int tcpm_psy_prop_writeable(struct power_supply *psy,
4673                                    enum power_supply_property psp)
4674 {
4675         switch (psp) {
4676         case POWER_SUPPLY_PROP_ONLINE:
4677         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
4678         case POWER_SUPPLY_PROP_CURRENT_NOW:
4679                 return 1;
4680         default:
4681                 return 0;
4682         }
4683 }
4684
4685 static enum power_supply_usb_type tcpm_psy_usb_types[] = {
4686         POWER_SUPPLY_USB_TYPE_C,
4687         POWER_SUPPLY_USB_TYPE_PD,
4688         POWER_SUPPLY_USB_TYPE_PD_PPS,
4689 };
4690
4691 static const char *tcpm_psy_name_prefix = "tcpm-source-psy-";
4692
4693 static int devm_tcpm_psy_register(struct tcpm_port *port)
4694 {
4695         struct power_supply_config psy_cfg = {};
4696         const char *port_dev_name = dev_name(port->dev);
4697         size_t psy_name_len = strlen(tcpm_psy_name_prefix) +
4698                                      strlen(port_dev_name) + 1;
4699         char *psy_name;
4700
4701         psy_cfg.drv_data = port;
4702         psy_cfg.fwnode = dev_fwnode(port->dev);
4703         psy_name = devm_kzalloc(port->dev, psy_name_len, GFP_KERNEL);
4704         if (!psy_name)
4705                 return -ENOMEM;
4706
4707         snprintf(psy_name, psy_name_len, "%s%s", tcpm_psy_name_prefix,
4708                  port_dev_name);
4709         port->psy_desc.name = psy_name;
4710         port->psy_desc.type = POWER_SUPPLY_TYPE_USB,
4711         port->psy_desc.usb_types = tcpm_psy_usb_types;
4712         port->psy_desc.num_usb_types = ARRAY_SIZE(tcpm_psy_usb_types);
4713         port->psy_desc.properties = tcpm_psy_props,
4714         port->psy_desc.num_properties = ARRAY_SIZE(tcpm_psy_props),
4715         port->psy_desc.get_property = tcpm_psy_get_prop,
4716         port->psy_desc.set_property = tcpm_psy_set_prop,
4717         port->psy_desc.property_is_writeable = tcpm_psy_prop_writeable,
4718
4719         port->usb_type = POWER_SUPPLY_USB_TYPE_C;
4720
4721         port->psy = devm_power_supply_register(port->dev, &port->psy_desc,
4722                                                &psy_cfg);
4723
4724         return PTR_ERR_OR_ZERO(port->psy);
4725 }
4726
4727 static int tcpm_copy_caps(struct tcpm_port *port,
4728                           const struct tcpc_config *tcfg)
4729 {
4730         if (tcpm_validate_caps(port, tcfg->src_pdo, tcfg->nr_src_pdo) ||
4731             tcpm_validate_caps(port, tcfg->snk_pdo, tcfg->nr_snk_pdo))
4732                 return -EINVAL;
4733
4734         port->nr_src_pdo = tcpm_copy_pdos(port->src_pdo, tcfg->src_pdo,
4735                                           tcfg->nr_src_pdo);
4736         port->nr_snk_pdo = tcpm_copy_pdos(port->snk_pdo, tcfg->snk_pdo,
4737                                           tcfg->nr_snk_pdo);
4738
4739         port->nr_snk_vdo = tcpm_copy_vdos(port->snk_vdo, tcfg->snk_vdo,
4740                                           tcfg->nr_snk_vdo);
4741
4742         port->operating_snk_mw = tcfg->operating_snk_mw;
4743
4744         port->typec_caps.prefer_role = tcfg->default_role;
4745         port->typec_caps.type = tcfg->type;
4746         port->typec_caps.data = tcfg->data;
4747         port->self_powered = tcfg->self_powered;
4748
4749         return 0;
4750 }
4751
4752 struct tcpm_port *tcpm_register_port(struct device *dev, struct tcpc_dev *tcpc)
4753 {
4754         struct tcpm_port *port;
4755         int i, err;
4756
4757         if (!dev || !tcpc ||
4758             !tcpc->get_vbus || !tcpc->set_cc || !tcpc->get_cc ||
4759             !tcpc->set_polarity || !tcpc->set_vconn || !tcpc->set_vbus ||
4760             !tcpc->set_pd_rx || !tcpc->set_roles || !tcpc->pd_transmit)
4761                 return ERR_PTR(-EINVAL);
4762
4763         port = devm_kzalloc(dev, sizeof(*port), GFP_KERNEL);
4764         if (!port)
4765                 return ERR_PTR(-ENOMEM);
4766
4767         port->dev = dev;
4768         port->tcpc = tcpc;
4769
4770         mutex_init(&port->lock);
4771         mutex_init(&port->swap_lock);
4772
4773         port->wq = create_singlethread_workqueue(dev_name(dev));
4774         if (!port->wq)
4775                 return ERR_PTR(-ENOMEM);
4776         INIT_DELAYED_WORK(&port->state_machine, tcpm_state_machine_work);
4777         INIT_DELAYED_WORK(&port->vdm_state_machine, vdm_state_machine_work);
4778         INIT_WORK(&port->event_work, tcpm_pd_event_handler);
4779
4780         spin_lock_init(&port->pd_event_lock);
4781
4782         init_completion(&port->tx_complete);
4783         init_completion(&port->swap_complete);
4784         init_completion(&port->pps_complete);
4785         tcpm_debugfs_init(port);
4786
4787         err = tcpm_fw_get_caps(port, tcpc->fwnode);
4788         if ((err < 0) && tcpc->config)
4789                 err = tcpm_copy_caps(port, tcpc->config);
4790         if (err < 0)
4791                 goto out_destroy_wq;
4792
4793         if (!tcpc->config || !tcpc->config->try_role_hw)
4794                 port->try_role = port->typec_caps.prefer_role;
4795         else
4796                 port->try_role = TYPEC_NO_PREFERRED_ROLE;
4797
4798         port->typec_caps.fwnode = tcpc->fwnode;
4799         port->typec_caps.revision = 0x0120;     /* Type-C spec release 1.2 */
4800         port->typec_caps.pd_revision = 0x0300;  /* USB-PD spec release 3.0 */
4801         port->typec_caps.dr_set = tcpm_dr_set;
4802         port->typec_caps.pr_set = tcpm_pr_set;
4803         port->typec_caps.vconn_set = tcpm_vconn_set;
4804         port->typec_caps.try_role = tcpm_try_role;
4805         port->typec_caps.port_type_set = tcpm_port_type_set;
4806
4807         port->partner_desc.identity = &port->partner_ident;
4808         port->port_type = port->typec_caps.type;
4809
4810         port->role_sw = usb_role_switch_get(port->dev);
4811         if (IS_ERR(port->role_sw)) {
4812                 err = PTR_ERR(port->role_sw);
4813                 goto out_destroy_wq;
4814         }
4815
4816         err = devm_tcpm_psy_register(port);
4817         if (err)
4818                 goto out_role_sw_put;
4819
4820         port->typec_port = typec_register_port(port->dev, &port->typec_caps);
4821         if (IS_ERR(port->typec_port)) {
4822                 err = PTR_ERR(port->typec_port);
4823                 goto out_role_sw_put;
4824         }
4825
4826         if (tcpc->config && tcpc->config->alt_modes) {
4827                 const struct typec_altmode_desc *paltmode = tcpc->config->alt_modes;
4828
4829                 i = 0;
4830                 while (paltmode->svid && i < ARRAY_SIZE(port->port_altmode)) {
4831                         struct typec_altmode *alt;
4832
4833                         alt = typec_port_register_altmode(port->typec_port,
4834                                                           paltmode);
4835                         if (IS_ERR(alt)) {
4836                                 tcpm_log(port,
4837                                          "%s: failed to register port alternate mode 0x%x",
4838                                          dev_name(dev), paltmode->svid);
4839                                 break;
4840                         }
4841                         typec_altmode_set_drvdata(alt, port);
4842                         alt->ops = &tcpm_altmode_ops;
4843                         port->port_altmode[i] = alt;
4844                         i++;
4845                         paltmode++;
4846                 }
4847         }
4848
4849         mutex_lock(&port->lock);
4850         tcpm_init(port);
4851         mutex_unlock(&port->lock);
4852
4853         tcpm_log(port, "%s: registered", dev_name(dev));
4854         return port;
4855
4856 out_role_sw_put:
4857         usb_role_switch_put(port->role_sw);
4858 out_destroy_wq:
4859         tcpm_debugfs_exit(port);
4860         destroy_workqueue(port->wq);
4861         return ERR_PTR(err);
4862 }
4863 EXPORT_SYMBOL_GPL(tcpm_register_port);
4864
4865 void tcpm_unregister_port(struct tcpm_port *port)
4866 {
4867         int i;
4868
4869         tcpm_reset_port(port);
4870         for (i = 0; i < ARRAY_SIZE(port->port_altmode); i++)
4871                 typec_unregister_altmode(port->port_altmode[i]);
4872         typec_unregister_port(port->typec_port);
4873         usb_role_switch_put(port->role_sw);
4874         tcpm_debugfs_exit(port);
4875         destroy_workqueue(port->wq);
4876 }
4877 EXPORT_SYMBOL_GPL(tcpm_unregister_port);
4878
4879 MODULE_AUTHOR("Guenter Roeck <groeck@chromium.org>");
4880 MODULE_DESCRIPTION("USB Type-C Port Manager");
4881 MODULE_LICENSE("GPL");