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