| 1 | /* |
| 2 | * Copyright 2015-2017 Google, Inc |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify |
| 5 | * it under the terms of the GNU General Public License as published by |
| 6 | * the Free Software Foundation; either version 2 of the License, or |
| 7 | * (at your option) any later version. |
| 8 | * |
| 9 | * This program is distributed in the hope that it will be useful, |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | * GNU General Public License for more details. |
| 13 | * |
| 14 | * USB Power Delivery protocol stack. |
| 15 | */ |
| 16 | |
| 17 | #include <linux/completion.h> |
| 18 | #include <linux/debugfs.h> |
| 19 | #include <linux/device.h> |
| 20 | #include <linux/kernel.h> |
| 21 | #include <linux/module.h> |
| 22 | #include <linux/mutex.h> |
| 23 | #include <linux/proc_fs.h> |
| 24 | #include <linux/sched/clock.h> |
| 25 | #include <linux/seq_file.h> |
| 26 | #include <linux/slab.h> |
| 27 | #include <linux/spinlock.h> |
| 28 | #include <linux/usb/typec.h> |
| 29 | #include <linux/workqueue.h> |
| 30 | |
| 31 | #include "pd.h" |
| 32 | #include "pd_vdo.h" |
| 33 | #include "pd_bdo.h" |
| 34 | #include "tcpm.h" |
| 35 | |
| 36 | #define FOREACH_STATE(S) \ |
| 37 | S(INVALID_STATE), \ |
| 38 | S(DRP_TOGGLING), \ |
| 39 | S(SRC_UNATTACHED), \ |
| 40 | S(SRC_ATTACH_WAIT), \ |
| 41 | S(SRC_ATTACHED), \ |
| 42 | S(SRC_STARTUP), \ |
| 43 | S(SRC_SEND_CAPABILITIES), \ |
| 44 | S(SRC_NEGOTIATE_CAPABILITIES), \ |
| 45 | S(SRC_TRANSITION_SUPPLY), \ |
| 46 | S(SRC_READY), \ |
| 47 | S(SRC_WAIT_NEW_CAPABILITIES), \ |
| 48 | \ |
| 49 | S(SNK_UNATTACHED), \ |
| 50 | S(SNK_ATTACH_WAIT), \ |
| 51 | S(SNK_DEBOUNCED), \ |
| 52 | S(SNK_ATTACHED), \ |
| 53 | S(SNK_STARTUP), \ |
| 54 | S(SNK_DISCOVERY), \ |
| 55 | S(SNK_DISCOVERY_DEBOUNCE), \ |
| 56 | S(SNK_DISCOVERY_DEBOUNCE_DONE), \ |
| 57 | S(SNK_WAIT_CAPABILITIES), \ |
| 58 | S(SNK_NEGOTIATE_CAPABILITIES), \ |
| 59 | S(SNK_TRANSITION_SINK), \ |
| 60 | S(SNK_TRANSITION_SINK_VBUS), \ |
| 61 | S(SNK_READY), \ |
| 62 | \ |
| 63 | S(ACC_UNATTACHED), \ |
| 64 | S(DEBUG_ACC_ATTACHED), \ |
| 65 | S(AUDIO_ACC_ATTACHED), \ |
| 66 | S(AUDIO_ACC_DEBOUNCE), \ |
| 67 | \ |
| 68 | S(HARD_RESET_SEND), \ |
| 69 | S(HARD_RESET_START), \ |
| 70 | S(SRC_HARD_RESET_VBUS_OFF), \ |
| 71 | S(SRC_HARD_RESET_VBUS_ON), \ |
| 72 | S(SNK_HARD_RESET_SINK_OFF), \ |
| 73 | S(SNK_HARD_RESET_WAIT_VBUS), \ |
| 74 | S(SNK_HARD_RESET_SINK_ON), \ |
| 75 | \ |
| 76 | S(SOFT_RESET), \ |
| 77 | S(SOFT_RESET_SEND), \ |
| 78 | \ |
| 79 | S(DR_SWAP_ACCEPT), \ |
| 80 | S(DR_SWAP_SEND), \ |
| 81 | S(DR_SWAP_SEND_TIMEOUT), \ |
| 82 | S(DR_SWAP_CANCEL), \ |
| 83 | S(DR_SWAP_CHANGE_DR), \ |
| 84 | \ |
| 85 | S(PR_SWAP_ACCEPT), \ |
| 86 | S(PR_SWAP_SEND), \ |
| 87 | S(PR_SWAP_SEND_TIMEOUT), \ |
| 88 | S(PR_SWAP_CANCEL), \ |
| 89 | S(PR_SWAP_START), \ |
| 90 | S(PR_SWAP_SRC_SNK_TRANSITION_OFF), \ |
| 91 | S(PR_SWAP_SRC_SNK_SOURCE_OFF), \ |
| 92 | S(PR_SWAP_SRC_SNK_SINK_ON), \ |
| 93 | S(PR_SWAP_SNK_SRC_SINK_OFF), \ |
| 94 | S(PR_SWAP_SNK_SRC_SOURCE_ON), \ |
| 95 | \ |
| 96 | S(VCONN_SWAP_ACCEPT), \ |
| 97 | S(VCONN_SWAP_SEND), \ |
| 98 | S(VCONN_SWAP_SEND_TIMEOUT), \ |
| 99 | S(VCONN_SWAP_CANCEL), \ |
| 100 | S(VCONN_SWAP_START), \ |
| 101 | S(VCONN_SWAP_WAIT_FOR_VCONN), \ |
| 102 | S(VCONN_SWAP_TURN_ON_VCONN), \ |
| 103 | S(VCONN_SWAP_TURN_OFF_VCONN), \ |
| 104 | \ |
| 105 | S(SNK_TRY), \ |
| 106 | S(SNK_TRY_WAIT), \ |
| 107 | S(SRC_TRYWAIT), \ |
| 108 | S(SRC_TRYWAIT_UNATTACHED), \ |
| 109 | \ |
| 110 | S(SRC_TRY), \ |
| 111 | S(SRC_TRY_DEBOUNCE), \ |
| 112 | S(SNK_TRYWAIT), \ |
| 113 | S(SNK_TRYWAIT_DEBOUNCE), \ |
| 114 | S(SNK_TRYWAIT_VBUS), \ |
| 115 | S(BIST_RX), \ |
| 116 | \ |
| 117 | S(ERROR_RECOVERY), \ |
| 118 | S(ERROR_RECOVERY_WAIT_OFF) |
| 119 | |
| 120 | #define GENERATE_ENUM(e) e |
| 121 | #define GENERATE_STRING(s) #s |
| 122 | |
| 123 | enum tcpm_state { |
| 124 | FOREACH_STATE(GENERATE_ENUM) |
| 125 | }; |
| 126 | |
| 127 | static const char * const tcpm_states[] = { |
| 128 | FOREACH_STATE(GENERATE_STRING) |
| 129 | }; |
| 130 | |
| 131 | enum vdm_states { |
| 132 | VDM_STATE_ERR_BUSY = -3, |
| 133 | VDM_STATE_ERR_SEND = -2, |
| 134 | VDM_STATE_ERR_TMOUT = -1, |
| 135 | VDM_STATE_DONE = 0, |
| 136 | /* Anything >0 represents an active state */ |
| 137 | VDM_STATE_READY = 1, |
| 138 | VDM_STATE_BUSY = 2, |
| 139 | VDM_STATE_WAIT_RSP_BUSY = 3, |
| 140 | }; |
| 141 | |
| 142 | enum pd_msg_request { |
| 143 | PD_MSG_NONE = 0, |
| 144 | PD_MSG_CTRL_REJECT, |
| 145 | PD_MSG_CTRL_WAIT, |
| 146 | PD_MSG_DATA_SINK_CAP, |
| 147 | PD_MSG_DATA_SOURCE_CAP, |
| 148 | }; |
| 149 | |
| 150 | /* Events from low level driver */ |
| 151 | |
| 152 | #define TCPM_CC_EVENT BIT(0) |
| 153 | #define TCPM_VBUS_EVENT BIT(1) |
| 154 | #define TCPM_RESET_EVENT BIT(2) |
| 155 | |
| 156 | #define LOG_BUFFER_ENTRIES 1024 |
| 157 | #define LOG_BUFFER_ENTRY_SIZE 128 |
| 158 | |
| 159 | /* Alternate mode support */ |
| 160 | |
| 161 | #define SVID_DISCOVERY_MAX 16 |
| 162 | |
| 163 | struct pd_mode_data { |
| 164 | int svid_index; /* current SVID index */ |
| 165 | int nsvids; |
| 166 | u16 svids[SVID_DISCOVERY_MAX]; |
| 167 | int altmodes; /* number of alternate modes */ |
| 168 | struct typec_altmode_desc altmode_desc[SVID_DISCOVERY_MAX]; |
| 169 | }; |
| 170 | |
| 171 | struct tcpm_port { |
| 172 | struct device *dev; |
| 173 | |
| 174 | struct mutex lock; /* tcpm state machine lock */ |
| 175 | struct workqueue_struct *wq; |
| 176 | |
| 177 | struct typec_capability typec_caps; |
| 178 | struct typec_port *typec_port; |
| 179 | |
| 180 | struct tcpc_dev *tcpc; |
| 181 | |
| 182 | enum typec_role vconn_role; |
| 183 | enum typec_role pwr_role; |
| 184 | enum typec_data_role data_role; |
| 185 | enum typec_pwr_opmode pwr_opmode; |
| 186 | |
| 187 | struct usb_pd_identity partner_ident; |
| 188 | struct typec_partner_desc partner_desc; |
| 189 | struct typec_partner *partner; |
| 190 | |
| 191 | enum typec_cc_status cc_req; |
| 192 | |
| 193 | enum typec_cc_status cc1; |
| 194 | enum typec_cc_status cc2; |
| 195 | enum typec_cc_polarity polarity; |
| 196 | |
| 197 | bool attached; |
| 198 | bool connected; |
| 199 | bool vbus_present; |
| 200 | bool vbus_never_low; |
| 201 | bool vbus_source; |
| 202 | bool vbus_charge; |
| 203 | |
| 204 | bool send_discover; |
| 205 | bool op_vsafe5v; |
| 206 | |
| 207 | int try_role; |
| 208 | int try_snk_count; |
| 209 | int try_src_count; |
| 210 | |
| 211 | enum pd_msg_request queued_message; |
| 212 | |
| 213 | enum tcpm_state enter_state; |
| 214 | enum tcpm_state prev_state; |
| 215 | enum tcpm_state state; |
| 216 | enum tcpm_state delayed_state; |
| 217 | unsigned long delayed_runtime; |
| 218 | unsigned long delay_ms; |
| 219 | |
| 220 | spinlock_t pd_event_lock; |
| 221 | u32 pd_events; |
| 222 | |
| 223 | struct work_struct event_work; |
| 224 | struct delayed_work state_machine; |
| 225 | struct delayed_work vdm_state_machine; |
| 226 | bool state_machine_running; |
| 227 | |
| 228 | struct completion tx_complete; |
| 229 | enum tcpm_transmit_status tx_status; |
| 230 | |
| 231 | struct mutex swap_lock; /* swap command lock */ |
| 232 | bool swap_pending; |
| 233 | struct completion swap_complete; |
| 234 | int swap_status; |
| 235 | |
| 236 | unsigned int message_id; |
| 237 | unsigned int caps_count; |
| 238 | unsigned int hard_reset_count; |
| 239 | bool pd_capable; |
| 240 | bool explicit_contract; |
| 241 | unsigned int rx_msgid; |
| 242 | |
| 243 | /* Partner capabilities/requests */ |
| 244 | u32 sink_request; |
| 245 | u32 source_caps[PDO_MAX_OBJECTS]; |
| 246 | unsigned int nr_source_caps; |
| 247 | u32 sink_caps[PDO_MAX_OBJECTS]; |
| 248 | unsigned int nr_sink_caps; |
| 249 | |
| 250 | /* Local capabilities */ |
| 251 | u32 src_pdo[PDO_MAX_OBJECTS]; |
| 252 | unsigned int nr_src_pdo; |
| 253 | u32 snk_pdo[PDO_MAX_OBJECTS]; |
| 254 | unsigned int nr_snk_pdo; |
| 255 | u32 snk_vdo[VDO_MAX_OBJECTS]; |
| 256 | unsigned int nr_snk_vdo; |
| 257 | |
| 258 | unsigned int max_snk_mv; |
| 259 | unsigned int max_snk_ma; |
| 260 | unsigned int max_snk_mw; |
| 261 | unsigned int operating_snk_mw; |
| 262 | |
| 263 | /* Requested current / voltage */ |
| 264 | u32 current_limit; |
| 265 | u32 supply_voltage; |
| 266 | |
| 267 | u32 bist_request; |
| 268 | |
| 269 | /* PD state for Vendor Defined Messages */ |
| 270 | enum vdm_states vdm_state; |
| 271 | u32 vdm_retries; |
| 272 | /* next Vendor Defined Message to send */ |
| 273 | u32 vdo_data[VDO_MAX_SIZE]; |
| 274 | u8 vdo_count; |
| 275 | /* VDO to retry if UFP responder replied busy */ |
| 276 | u32 vdo_retry; |
| 277 | |
| 278 | /* Alternate mode data */ |
| 279 | |
| 280 | struct pd_mode_data mode_data; |
| 281 | struct typec_altmode *partner_altmode[SVID_DISCOVERY_MAX]; |
| 282 | struct typec_altmode *port_altmode[SVID_DISCOVERY_MAX]; |
| 283 | |
| 284 | #ifdef CONFIG_DEBUG_FS |
| 285 | struct dentry *dentry; |
| 286 | struct mutex logbuffer_lock; /* log buffer access lock */ |
| 287 | int logbuffer_head; |
| 288 | int logbuffer_tail; |
| 289 | u8 *logbuffer[LOG_BUFFER_ENTRIES]; |
| 290 | #endif |
| 291 | }; |
| 292 | |
| 293 | struct pd_rx_event { |
| 294 | struct work_struct work; |
| 295 | struct tcpm_port *port; |
| 296 | struct pd_message msg; |
| 297 | }; |
| 298 | |
| 299 | #define tcpm_cc_is_sink(cc) \ |
| 300 | ((cc) == TYPEC_CC_RP_DEF || (cc) == TYPEC_CC_RP_1_5 || \ |
| 301 | (cc) == TYPEC_CC_RP_3_0) |
| 302 | |
| 303 | #define tcpm_port_is_sink(port) \ |
| 304 | ((tcpm_cc_is_sink((port)->cc1) && !tcpm_cc_is_sink((port)->cc2)) || \ |
| 305 | (tcpm_cc_is_sink((port)->cc2) && !tcpm_cc_is_sink((port)->cc1))) |
| 306 | |
| 307 | #define tcpm_cc_is_source(cc) ((cc) == TYPEC_CC_RD) |
| 308 | #define tcpm_cc_is_audio(cc) ((cc) == TYPEC_CC_RA) |
| 309 | #define tcpm_cc_is_open(cc) ((cc) == TYPEC_CC_OPEN) |
| 310 | |
| 311 | #define tcpm_port_is_source(port) \ |
| 312 | ((tcpm_cc_is_source((port)->cc1) && \ |
| 313 | !tcpm_cc_is_source((port)->cc2)) || \ |
| 314 | (tcpm_cc_is_source((port)->cc2) && \ |
| 315 | !tcpm_cc_is_source((port)->cc1))) |
| 316 | |
| 317 | #define tcpm_port_is_debug(port) \ |
| 318 | (tcpm_cc_is_source((port)->cc1) && tcpm_cc_is_source((port)->cc2)) |
| 319 | |
| 320 | #define tcpm_port_is_audio(port) \ |
| 321 | (tcpm_cc_is_audio((port)->cc1) && tcpm_cc_is_audio((port)->cc2)) |
| 322 | |
| 323 | #define tcpm_port_is_audio_detached(port) \ |
| 324 | ((tcpm_cc_is_audio((port)->cc1) && tcpm_cc_is_open((port)->cc2)) || \ |
| 325 | (tcpm_cc_is_audio((port)->cc2) && tcpm_cc_is_open((port)->cc1))) |
| 326 | |
| 327 | #define tcpm_try_snk(port) \ |
| 328 | ((port)->try_snk_count == 0 && (port)->try_role == TYPEC_SINK) |
| 329 | |
| 330 | #define tcpm_try_src(port) \ |
| 331 | ((port)->try_src_count == 0 && (port)->try_role == TYPEC_SOURCE) |
| 332 | |
| 333 | static enum tcpm_state tcpm_default_state(struct tcpm_port *port) |
| 334 | { |
| 335 | if (port->try_role == TYPEC_SINK) |
| 336 | return SNK_UNATTACHED; |
| 337 | else if (port->try_role == TYPEC_SOURCE) |
| 338 | return SRC_UNATTACHED; |
| 339 | else if (port->tcpc->config->default_role == TYPEC_SINK) |
| 340 | return SNK_UNATTACHED; |
| 341 | return SRC_UNATTACHED; |
| 342 | } |
| 343 | |
| 344 | static inline |
| 345 | struct tcpm_port *typec_cap_to_tcpm(const struct typec_capability *cap) |
| 346 | { |
| 347 | return container_of(cap, struct tcpm_port, typec_caps); |
| 348 | } |
| 349 | |
| 350 | static bool tcpm_port_is_disconnected(struct tcpm_port *port) |
| 351 | { |
| 352 | return (!port->attached && port->cc1 == TYPEC_CC_OPEN && |
| 353 | port->cc2 == TYPEC_CC_OPEN) || |
| 354 | (port->attached && ((port->polarity == TYPEC_POLARITY_CC1 && |
| 355 | port->cc1 == TYPEC_CC_OPEN) || |
| 356 | (port->polarity == TYPEC_POLARITY_CC2 && |
| 357 | port->cc2 == TYPEC_CC_OPEN))); |
| 358 | } |
| 359 | |
| 360 | /* |
| 361 | * Logging |
| 362 | */ |
| 363 | |
| 364 | #ifdef CONFIG_DEBUG_FS |
| 365 | |
| 366 | static bool tcpm_log_full(struct tcpm_port *port) |
| 367 | { |
| 368 | return port->logbuffer_tail == |
| 369 | (port->logbuffer_head + 1) % LOG_BUFFER_ENTRIES; |
| 370 | } |
| 371 | |
| 372 | static void _tcpm_log(struct tcpm_port *port, const char *fmt, va_list args) |
| 373 | { |
| 374 | char tmpbuffer[LOG_BUFFER_ENTRY_SIZE]; |
| 375 | u64 ts_nsec = local_clock(); |
| 376 | unsigned long rem_nsec; |
| 377 | |
| 378 | if (!port->logbuffer[port->logbuffer_head]) { |
| 379 | port->logbuffer[port->logbuffer_head] = |
| 380 | kzalloc(LOG_BUFFER_ENTRY_SIZE, GFP_KERNEL); |
| 381 | if (!port->logbuffer[port->logbuffer_head]) |
| 382 | return; |
| 383 | } |
| 384 | |
| 385 | vsnprintf(tmpbuffer, sizeof(tmpbuffer), fmt, args); |
| 386 | |
| 387 | mutex_lock(&port->logbuffer_lock); |
| 388 | |
| 389 | if (tcpm_log_full(port)) { |
| 390 | port->logbuffer_head = max(port->logbuffer_head - 1, 0); |
| 391 | strcpy(tmpbuffer, "overflow"); |
| 392 | } |
| 393 | |
| 394 | if (port->logbuffer_head < 0 || |
| 395 | port->logbuffer_head >= LOG_BUFFER_ENTRIES) { |
| 396 | dev_warn(port->dev, |
| 397 | "Bad log buffer index %d\n", port->logbuffer_head); |
| 398 | goto abort; |
| 399 | } |
| 400 | |
| 401 | if (!port->logbuffer[port->logbuffer_head]) { |
| 402 | dev_warn(port->dev, |
| 403 | "Log buffer index %d is NULL\n", port->logbuffer_head); |
| 404 | goto abort; |
| 405 | } |
| 406 | |
| 407 | rem_nsec = do_div(ts_nsec, 1000000000); |
| 408 | scnprintf(port->logbuffer[port->logbuffer_head], |
| 409 | LOG_BUFFER_ENTRY_SIZE, "[%5lu.%06lu] %s", |
| 410 | (unsigned long)ts_nsec, rem_nsec / 1000, |
| 411 | tmpbuffer); |
| 412 | port->logbuffer_head = (port->logbuffer_head + 1) % LOG_BUFFER_ENTRIES; |
| 413 | |
| 414 | abort: |
| 415 | mutex_unlock(&port->logbuffer_lock); |
| 416 | } |
| 417 | |
| 418 | static void tcpm_log(struct tcpm_port *port, const char *fmt, ...) |
| 419 | { |
| 420 | va_list args; |
| 421 | |
| 422 | /* Do not log while disconnected and unattached */ |
| 423 | if (tcpm_port_is_disconnected(port) && |
| 424 | (port->state == SRC_UNATTACHED || port->state == SNK_UNATTACHED || |
| 425 | port->state == DRP_TOGGLING)) |
| 426 | return; |
| 427 | |
| 428 | va_start(args, fmt); |
| 429 | _tcpm_log(port, fmt, args); |
| 430 | va_end(args); |
| 431 | } |
| 432 | |
| 433 | static void tcpm_log_force(struct tcpm_port *port, const char *fmt, ...) |
| 434 | { |
| 435 | va_list args; |
| 436 | |
| 437 | va_start(args, fmt); |
| 438 | _tcpm_log(port, fmt, args); |
| 439 | va_end(args); |
| 440 | } |
| 441 | |
| 442 | static void tcpm_log_source_caps(struct tcpm_port *port) |
| 443 | { |
| 444 | int i; |
| 445 | |
| 446 | for (i = 0; i < port->nr_source_caps; i++) { |
| 447 | u32 pdo = port->source_caps[i]; |
| 448 | enum pd_pdo_type type = pdo_type(pdo); |
| 449 | char msg[64]; |
| 450 | |
| 451 | switch (type) { |
| 452 | case PDO_TYPE_FIXED: |
| 453 | scnprintf(msg, sizeof(msg), |
| 454 | "%u mV, %u mA [%s%s%s%s%s%s]", |
| 455 | pdo_fixed_voltage(pdo), |
| 456 | pdo_max_current(pdo), |
| 457 | (pdo & PDO_FIXED_DUAL_ROLE) ? |
| 458 | "R" : "", |
| 459 | (pdo & PDO_FIXED_SUSPEND) ? |
| 460 | "S" : "", |
| 461 | (pdo & PDO_FIXED_HIGHER_CAP) ? |
| 462 | "H" : "", |
| 463 | (pdo & PDO_FIXED_USB_COMM) ? |
| 464 | "U" : "", |
| 465 | (pdo & PDO_FIXED_DATA_SWAP) ? |
| 466 | "D" : "", |
| 467 | (pdo & PDO_FIXED_EXTPOWER) ? |
| 468 | "E" : ""); |
| 469 | break; |
| 470 | case PDO_TYPE_VAR: |
| 471 | scnprintf(msg, sizeof(msg), |
| 472 | "%u-%u mV, %u mA", |
| 473 | pdo_min_voltage(pdo), |
| 474 | pdo_max_voltage(pdo), |
| 475 | pdo_max_current(pdo)); |
| 476 | break; |
| 477 | case PDO_TYPE_BATT: |
| 478 | scnprintf(msg, sizeof(msg), |
| 479 | "%u-%u mV, %u mW", |
| 480 | pdo_min_voltage(pdo), |
| 481 | pdo_max_voltage(pdo), |
| 482 | pdo_max_power(pdo)); |
| 483 | break; |
| 484 | default: |
| 485 | strcpy(msg, "undefined"); |
| 486 | break; |
| 487 | } |
| 488 | tcpm_log(port, " PDO %d: type %d, %s", |
| 489 | i, type, msg); |
| 490 | } |
| 491 | } |
| 492 | |
| 493 | static int tcpm_seq_show(struct seq_file *s, void *v) |
| 494 | { |
| 495 | struct tcpm_port *port = (struct tcpm_port *)s->private; |
| 496 | int tail; |
| 497 | |
| 498 | mutex_lock(&port->logbuffer_lock); |
| 499 | tail = port->logbuffer_tail; |
| 500 | while (tail != port->logbuffer_head) { |
| 501 | seq_printf(s, "%s\n", port->logbuffer[tail]); |
| 502 | tail = (tail + 1) % LOG_BUFFER_ENTRIES; |
| 503 | } |
| 504 | if (!seq_has_overflowed(s)) |
| 505 | port->logbuffer_tail = tail; |
| 506 | mutex_unlock(&port->logbuffer_lock); |
| 507 | |
| 508 | return 0; |
| 509 | } |
| 510 | |
| 511 | static int tcpm_debug_open(struct inode *inode, struct file *file) |
| 512 | { |
| 513 | return single_open(file, tcpm_seq_show, inode->i_private); |
| 514 | } |
| 515 | |
| 516 | static const struct file_operations tcpm_debug_operations = { |
| 517 | .open = tcpm_debug_open, |
| 518 | .llseek = seq_lseek, |
| 519 | .read = seq_read, |
| 520 | .release = single_release, |
| 521 | }; |
| 522 | |
| 523 | static struct dentry *rootdir; |
| 524 | |
| 525 | static int tcpm_debugfs_init(struct tcpm_port *port) |
| 526 | { |
| 527 | mutex_init(&port->logbuffer_lock); |
| 528 | /* /sys/kernel/debug/tcpm/usbcX */ |
| 529 | if (!rootdir) { |
| 530 | rootdir = debugfs_create_dir("tcpm", NULL); |
| 531 | if (!rootdir) |
| 532 | return -ENOMEM; |
| 533 | } |
| 534 | |
| 535 | port->dentry = debugfs_create_file(dev_name(port->dev), |
| 536 | S_IFREG | 0444, rootdir, |
| 537 | port, &tcpm_debug_operations); |
| 538 | |
| 539 | return 0; |
| 540 | } |
| 541 | |
| 542 | static void tcpm_debugfs_exit(struct tcpm_port *port) |
| 543 | { |
| 544 | debugfs_remove(port->dentry); |
| 545 | } |
| 546 | |
| 547 | #else |
| 548 | |
| 549 | static void tcpm_log(const struct tcpm_port *port, const char *fmt, ...) { } |
| 550 | static void tcpm_log_force(struct tcpm_port *port, const char *fmt, ...) { } |
| 551 | static void tcpm_log_source_caps(struct tcpm_port *port) { } |
| 552 | static int tcpm_debugfs_init(const struct tcpm_port *port) { return 0; } |
| 553 | static void tcpm_debugfs_exit(const struct tcpm_port *port) { } |
| 554 | |
| 555 | #endif |
| 556 | |
| 557 | static int tcpm_pd_transmit(struct tcpm_port *port, |
| 558 | enum tcpm_transmit_type type, |
| 559 | const struct pd_message *msg) |
| 560 | { |
| 561 | unsigned long timeout; |
| 562 | int ret; |
| 563 | |
| 564 | if (msg) |
| 565 | tcpm_log(port, "PD TX, header: %#x", le16_to_cpu(msg->header)); |
| 566 | else |
| 567 | tcpm_log(port, "PD TX, type: %#x", type); |
| 568 | |
| 569 | reinit_completion(&port->tx_complete); |
| 570 | ret = port->tcpc->pd_transmit(port->tcpc, type, msg); |
| 571 | if (ret < 0) |
| 572 | return ret; |
| 573 | |
| 574 | mutex_unlock(&port->lock); |
| 575 | timeout = wait_for_completion_timeout(&port->tx_complete, |
| 576 | msecs_to_jiffies(PD_T_TCPC_TX_TIMEOUT)); |
| 577 | mutex_lock(&port->lock); |
| 578 | if (!timeout) |
| 579 | return -ETIMEDOUT; |
| 580 | |
| 581 | switch (port->tx_status) { |
| 582 | case TCPC_TX_SUCCESS: |
| 583 | port->message_id = (port->message_id + 1) & PD_HEADER_ID_MASK; |
| 584 | return 0; |
| 585 | case TCPC_TX_DISCARDED: |
| 586 | return -EAGAIN; |
| 587 | case TCPC_TX_FAILED: |
| 588 | default: |
| 589 | return -EIO; |
| 590 | } |
| 591 | } |
| 592 | |
| 593 | void tcpm_pd_transmit_complete(struct tcpm_port *port, |
| 594 | enum tcpm_transmit_status status) |
| 595 | { |
| 596 | tcpm_log(port, "PD TX complete, status: %u", status); |
| 597 | port->tx_status = status; |
| 598 | complete(&port->tx_complete); |
| 599 | } |
| 600 | EXPORT_SYMBOL_GPL(tcpm_pd_transmit_complete); |
| 601 | |
| 602 | static int tcpm_mux_set(struct tcpm_port *port, enum tcpc_mux_mode mode, |
| 603 | enum tcpc_usb_switch config) |
| 604 | { |
| 605 | int ret = 0; |
| 606 | |
| 607 | tcpm_log(port, "Requesting mux mode %d, config %d, polarity %d", |
| 608 | mode, config, port->polarity); |
| 609 | |
| 610 | if (port->tcpc->mux) |
| 611 | ret = port->tcpc->mux->set(port->tcpc->mux, mode, config, |
| 612 | port->polarity); |
| 613 | |
| 614 | return ret; |
| 615 | } |
| 616 | |
| 617 | static int tcpm_set_polarity(struct tcpm_port *port, |
| 618 | enum typec_cc_polarity polarity) |
| 619 | { |
| 620 | int ret; |
| 621 | |
| 622 | tcpm_log(port, "polarity %d", polarity); |
| 623 | |
| 624 | ret = port->tcpc->set_polarity(port->tcpc, polarity); |
| 625 | if (ret < 0) |
| 626 | return ret; |
| 627 | |
| 628 | port->polarity = polarity; |
| 629 | |
| 630 | return 0; |
| 631 | } |
| 632 | |
| 633 | static int tcpm_set_vconn(struct tcpm_port *port, bool enable) |
| 634 | { |
| 635 | int ret; |
| 636 | |
| 637 | tcpm_log(port, "vconn:=%d", enable); |
| 638 | |
| 639 | ret = port->tcpc->set_vconn(port->tcpc, enable); |
| 640 | if (!ret) { |
| 641 | port->vconn_role = enable ? TYPEC_SOURCE : TYPEC_SINK; |
| 642 | typec_set_vconn_role(port->typec_port, port->vconn_role); |
| 643 | } |
| 644 | |
| 645 | return ret; |
| 646 | } |
| 647 | |
| 648 | static u32 tcpm_get_current_limit(struct tcpm_port *port) |
| 649 | { |
| 650 | enum typec_cc_status cc; |
| 651 | u32 limit; |
| 652 | |
| 653 | cc = port->polarity ? port->cc2 : port->cc1; |
| 654 | switch (cc) { |
| 655 | case TYPEC_CC_RP_1_5: |
| 656 | limit = 1500; |
| 657 | break; |
| 658 | case TYPEC_CC_RP_3_0: |
| 659 | limit = 3000; |
| 660 | break; |
| 661 | case TYPEC_CC_RP_DEF: |
| 662 | default: |
| 663 | limit = 0; |
| 664 | break; |
| 665 | } |
| 666 | |
| 667 | return limit; |
| 668 | } |
| 669 | |
| 670 | static int tcpm_set_current_limit(struct tcpm_port *port, u32 max_ma, u32 mv) |
| 671 | { |
| 672 | int ret = -EOPNOTSUPP; |
| 673 | |
| 674 | tcpm_log(port, "Setting voltage/current limit %u mV %u mA", mv, max_ma); |
| 675 | |
| 676 | if (port->tcpc->set_current_limit) |
| 677 | ret = port->tcpc->set_current_limit(port->tcpc, max_ma, mv); |
| 678 | |
| 679 | return ret; |
| 680 | } |
| 681 | |
| 682 | /* |
| 683 | * Determine RP value to set based on maximum current supported |
| 684 | * by a port if configured as source. |
| 685 | * Returns CC value to report to link partner. |
| 686 | */ |
| 687 | static enum typec_cc_status tcpm_rp_cc(struct tcpm_port *port) |
| 688 | { |
| 689 | const u32 *src_pdo = port->src_pdo; |
| 690 | int nr_pdo = port->nr_src_pdo; |
| 691 | int i; |
| 692 | |
| 693 | /* |
| 694 | * Search for first entry with matching voltage. |
| 695 | * It should report the maximum supported current. |
| 696 | */ |
| 697 | for (i = 0; i < nr_pdo; i++) { |
| 698 | const u32 pdo = src_pdo[i]; |
| 699 | |
| 700 | if (pdo_type(pdo) == PDO_TYPE_FIXED && |
| 701 | pdo_fixed_voltage(pdo) == 5000) { |
| 702 | unsigned int curr = pdo_max_current(pdo); |
| 703 | |
| 704 | if (curr >= 3000) |
| 705 | return TYPEC_CC_RP_3_0; |
| 706 | else if (curr >= 1500) |
| 707 | return TYPEC_CC_RP_1_5; |
| 708 | return TYPEC_CC_RP_DEF; |
| 709 | } |
| 710 | } |
| 711 | |
| 712 | return TYPEC_CC_RP_DEF; |
| 713 | } |
| 714 | |
| 715 | static int tcpm_set_attached_state(struct tcpm_port *port, bool attached) |
| 716 | { |
| 717 | return port->tcpc->set_roles(port->tcpc, attached, port->pwr_role, |
| 718 | port->data_role); |
| 719 | } |
| 720 | |
| 721 | static int tcpm_set_roles(struct tcpm_port *port, bool attached, |
| 722 | enum typec_role role, enum typec_data_role data) |
| 723 | { |
| 724 | int ret; |
| 725 | |
| 726 | if (data == TYPEC_HOST) |
| 727 | ret = tcpm_mux_set(port, TYPEC_MUX_USB, |
| 728 | TCPC_USB_SWITCH_CONNECT); |
| 729 | else |
| 730 | ret = tcpm_mux_set(port, TYPEC_MUX_NONE, |
| 731 | TCPC_USB_SWITCH_DISCONNECT); |
| 732 | if (ret < 0) |
| 733 | return ret; |
| 734 | |
| 735 | ret = port->tcpc->set_roles(port->tcpc, attached, role, data); |
| 736 | if (ret < 0) |
| 737 | return ret; |
| 738 | |
| 739 | port->pwr_role = role; |
| 740 | port->data_role = data; |
| 741 | typec_set_data_role(port->typec_port, data); |
| 742 | typec_set_pwr_role(port->typec_port, role); |
| 743 | |
| 744 | return 0; |
| 745 | } |
| 746 | |
| 747 | static int tcpm_set_pwr_role(struct tcpm_port *port, enum typec_role role) |
| 748 | { |
| 749 | int ret; |
| 750 | |
| 751 | ret = port->tcpc->set_roles(port->tcpc, true, role, |
| 752 | port->data_role); |
| 753 | if (ret < 0) |
| 754 | return ret; |
| 755 | |
| 756 | port->pwr_role = role; |
| 757 | typec_set_pwr_role(port->typec_port, role); |
| 758 | |
| 759 | return 0; |
| 760 | } |
| 761 | |
| 762 | static int tcpm_pd_send_source_caps(struct tcpm_port *port) |
| 763 | { |
| 764 | struct pd_message msg; |
| 765 | int i; |
| 766 | |
| 767 | memset(&msg, 0, sizeof(msg)); |
| 768 | if (!port->nr_src_pdo) { |
| 769 | /* No source capabilities defined, sink only */ |
| 770 | msg.header = PD_HEADER_LE(PD_CTRL_REJECT, |
| 771 | port->pwr_role, |
| 772 | port->data_role, |
| 773 | port->message_id, 0); |
| 774 | } else { |
| 775 | msg.header = PD_HEADER_LE(PD_DATA_SOURCE_CAP, |
| 776 | port->pwr_role, |
| 777 | port->data_role, |
| 778 | port->message_id, |
| 779 | port->nr_src_pdo); |
| 780 | } |
| 781 | for (i = 0; i < port->nr_src_pdo; i++) |
| 782 | msg.payload[i] = cpu_to_le32(port->src_pdo[i]); |
| 783 | |
| 784 | return tcpm_pd_transmit(port, TCPC_TX_SOP, &msg); |
| 785 | } |
| 786 | |
| 787 | static int tcpm_pd_send_sink_caps(struct tcpm_port *port) |
| 788 | { |
| 789 | struct pd_message msg; |
| 790 | int i; |
| 791 | |
| 792 | memset(&msg, 0, sizeof(msg)); |
| 793 | if (!port->nr_snk_pdo) { |
| 794 | /* No sink capabilities defined, source only */ |
| 795 | msg.header = PD_HEADER_LE(PD_CTRL_REJECT, |
| 796 | port->pwr_role, |
| 797 | port->data_role, |
| 798 | port->message_id, 0); |
| 799 | } else { |
| 800 | msg.header = PD_HEADER_LE(PD_DATA_SINK_CAP, |
| 801 | port->pwr_role, |
| 802 | port->data_role, |
| 803 | port->message_id, |
| 804 | port->nr_snk_pdo); |
| 805 | } |
| 806 | for (i = 0; i < port->nr_snk_pdo; i++) |
| 807 | msg.payload[i] = cpu_to_le32(port->snk_pdo[i]); |
| 808 | |
| 809 | return tcpm_pd_transmit(port, TCPC_TX_SOP, &msg); |
| 810 | } |
| 811 | |
| 812 | static void tcpm_set_state(struct tcpm_port *port, enum tcpm_state state, |
| 813 | unsigned int delay_ms) |
| 814 | { |
| 815 | if (delay_ms) { |
| 816 | tcpm_log(port, "pending state change %s -> %s @ %u ms", |
| 817 | tcpm_states[port->state], tcpm_states[state], |
| 818 | delay_ms); |
| 819 | port->delayed_state = state; |
| 820 | mod_delayed_work(port->wq, &port->state_machine, |
| 821 | msecs_to_jiffies(delay_ms)); |
| 822 | port->delayed_runtime = jiffies + msecs_to_jiffies(delay_ms); |
| 823 | port->delay_ms = delay_ms; |
| 824 | } else { |
| 825 | tcpm_log(port, "state change %s -> %s", |
| 826 | tcpm_states[port->state], tcpm_states[state]); |
| 827 | port->delayed_state = INVALID_STATE; |
| 828 | port->prev_state = port->state; |
| 829 | port->state = state; |
| 830 | /* |
| 831 | * Don't re-queue the state machine work item if we're currently |
| 832 | * in the state machine and we're immediately changing states. |
| 833 | * tcpm_state_machine_work() will continue running the state |
| 834 | * machine. |
| 835 | */ |
| 836 | if (!port->state_machine_running) |
| 837 | mod_delayed_work(port->wq, &port->state_machine, 0); |
| 838 | } |
| 839 | } |
| 840 | |
| 841 | static void tcpm_set_state_cond(struct tcpm_port *port, enum tcpm_state state, |
| 842 | unsigned int delay_ms) |
| 843 | { |
| 844 | if (port->enter_state == port->state) |
| 845 | tcpm_set_state(port, state, delay_ms); |
| 846 | else |
| 847 | tcpm_log(port, |
| 848 | "skipped %sstate change %s -> %s [%u ms], context state %s", |
| 849 | delay_ms ? "delayed " : "", |
| 850 | tcpm_states[port->state], tcpm_states[state], |
| 851 | delay_ms, tcpm_states[port->enter_state]); |
| 852 | } |
| 853 | |
| 854 | static void tcpm_queue_message(struct tcpm_port *port, |
| 855 | enum pd_msg_request message) |
| 856 | { |
| 857 | port->queued_message = message; |
| 858 | mod_delayed_work(port->wq, &port->state_machine, 0); |
| 859 | } |
| 860 | |
| 861 | /* |
| 862 | * VDM/VDO handling functions |
| 863 | */ |
| 864 | static void tcpm_queue_vdm(struct tcpm_port *port, const u32 header, |
| 865 | const u32 *data, int cnt) |
| 866 | { |
| 867 | port->vdo_count = cnt + 1; |
| 868 | port->vdo_data[0] = header; |
| 869 | memcpy(&port->vdo_data[1], data, sizeof(u32) * cnt); |
| 870 | /* Set ready, vdm state machine will actually send */ |
| 871 | port->vdm_retries = 0; |
| 872 | port->vdm_state = VDM_STATE_READY; |
| 873 | } |
| 874 | |
| 875 | static void svdm_consume_identity(struct tcpm_port *port, const __le32 *payload, |
| 876 | int cnt) |
| 877 | { |
| 878 | u32 vdo = le32_to_cpu(payload[VDO_INDEX_IDH]); |
| 879 | u32 product = le32_to_cpu(payload[VDO_INDEX_PRODUCT]); |
| 880 | |
| 881 | memset(&port->mode_data, 0, sizeof(port->mode_data)); |
| 882 | |
| 883 | #if 0 /* Not really a match */ |
| 884 | switch (PD_IDH_PTYPE(vdo)) { |
| 885 | case IDH_PTYPE_UNDEF: |
| 886 | port->partner.type = TYPEC_PARTNER_NONE; /* no longer exists */ |
| 887 | break; |
| 888 | case IDH_PTYPE_HUB: |
| 889 | break; |
| 890 | case IDH_PTYPE_PERIPH: |
| 891 | break; |
| 892 | case IDH_PTYPE_PCABLE: |
| 893 | break; |
| 894 | case IDH_PTYPE_ACABLE: |
| 895 | break; |
| 896 | case IDH_PTYPE_AMA: |
| 897 | port->partner.type = TYPEC_PARTNER_ALTMODE; |
| 898 | break; |
| 899 | default: |
| 900 | break; |
| 901 | } |
| 902 | #endif |
| 903 | |
| 904 | port->partner_ident.id_header = vdo; |
| 905 | port->partner_ident.cert_stat = le32_to_cpu(payload[VDO_INDEX_CSTAT]); |
| 906 | port->partner_ident.product = product; |
| 907 | |
| 908 | typec_partner_set_identity(port->partner); |
| 909 | |
| 910 | tcpm_log(port, "Identity: %04x:%04x.%04x", |
| 911 | PD_IDH_VID(vdo), |
| 912 | PD_PRODUCT_PID(product), product & 0xffff); |
| 913 | } |
| 914 | |
| 915 | static bool svdm_consume_svids(struct tcpm_port *port, const __le32 *payload, |
| 916 | int cnt) |
| 917 | { |
| 918 | struct pd_mode_data *pmdata = &port->mode_data; |
| 919 | int i; |
| 920 | |
| 921 | for (i = 1; i < cnt; i++) { |
| 922 | u32 p = le32_to_cpu(payload[i]); |
| 923 | u16 svid; |
| 924 | |
| 925 | svid = (p >> 16) & 0xffff; |
| 926 | if (!svid) |
| 927 | return false; |
| 928 | |
| 929 | if (pmdata->nsvids >= SVID_DISCOVERY_MAX) |
| 930 | goto abort; |
| 931 | |
| 932 | pmdata->svids[pmdata->nsvids++] = svid; |
| 933 | tcpm_log(port, "SVID %d: 0x%x", pmdata->nsvids, svid); |
| 934 | |
| 935 | svid = p & 0xffff; |
| 936 | if (!svid) |
| 937 | return false; |
| 938 | |
| 939 | if (pmdata->nsvids >= SVID_DISCOVERY_MAX) |
| 940 | goto abort; |
| 941 | |
| 942 | pmdata->svids[pmdata->nsvids++] = svid; |
| 943 | tcpm_log(port, "SVID %d: 0x%x", pmdata->nsvids, svid); |
| 944 | } |
| 945 | return true; |
| 946 | abort: |
| 947 | tcpm_log(port, "SVID_DISCOVERY_MAX(%d) too low!", SVID_DISCOVERY_MAX); |
| 948 | return false; |
| 949 | } |
| 950 | |
| 951 | static void svdm_consume_modes(struct tcpm_port *port, const __le32 *payload, |
| 952 | int cnt) |
| 953 | { |
| 954 | struct pd_mode_data *pmdata = &port->mode_data; |
| 955 | struct typec_altmode_desc *paltmode; |
| 956 | struct typec_mode_desc *pmode; |
| 957 | int i; |
| 958 | |
| 959 | if (pmdata->altmodes >= ARRAY_SIZE(port->partner_altmode)) { |
| 960 | /* Already logged in svdm_consume_svids() */ |
| 961 | return; |
| 962 | } |
| 963 | |
| 964 | paltmode = &pmdata->altmode_desc[pmdata->altmodes]; |
| 965 | memset(paltmode, 0, sizeof(*paltmode)); |
| 966 | |
| 967 | paltmode->svid = pmdata->svids[pmdata->svid_index]; |
| 968 | |
| 969 | tcpm_log(port, " Alternate mode %d: SVID 0x%04x", |
| 970 | pmdata->altmodes, paltmode->svid); |
| 971 | |
| 972 | for (i = 1; i < cnt && paltmode->n_modes < ALTMODE_MAX_MODES; i++) { |
| 973 | pmode = &paltmode->modes[paltmode->n_modes]; |
| 974 | memset(pmode, 0, sizeof(*pmode)); |
| 975 | pmode->vdo = le32_to_cpu(payload[i]); |
| 976 | pmode->index = i - 1; |
| 977 | paltmode->n_modes++; |
| 978 | tcpm_log(port, " VDO %d: 0x%08x", |
| 979 | pmode->index, pmode->vdo); |
| 980 | } |
| 981 | port->partner_altmode[pmdata->altmodes] = |
| 982 | typec_partner_register_altmode(port->partner, paltmode); |
| 983 | if (port->partner_altmode[pmdata->altmodes] == NULL) { |
| 984 | tcpm_log(port, |
| 985 | "Failed to register alternate modes for SVID 0x%04x", |
| 986 | paltmode->svid); |
| 987 | return; |
| 988 | } |
| 989 | pmdata->altmodes++; |
| 990 | } |
| 991 | |
| 992 | #define supports_modal(port) PD_IDH_MODAL_SUPP((port)->partner_ident.id_header) |
| 993 | |
| 994 | static int tcpm_pd_svdm(struct tcpm_port *port, const __le32 *payload, int cnt, |
| 995 | u32 *response) |
| 996 | { |
| 997 | u32 p0 = le32_to_cpu(payload[0]); |
| 998 | int cmd_type = PD_VDO_CMDT(p0); |
| 999 | int cmd = PD_VDO_CMD(p0); |
| 1000 | struct pd_mode_data *modep; |
| 1001 | int rlen = 0; |
| 1002 | u16 svid; |
| 1003 | int i; |
| 1004 | |
| 1005 | tcpm_log(port, "Rx VDM cmd 0x%x type %d cmd %d len %d", |
| 1006 | p0, cmd_type, cmd, cnt); |
| 1007 | |
| 1008 | modep = &port->mode_data; |
| 1009 | |
| 1010 | switch (cmd_type) { |
| 1011 | case CMDT_INIT: |
| 1012 | switch (cmd) { |
| 1013 | case CMD_DISCOVER_IDENT: |
| 1014 | /* 6.4.4.3.1: Only respond as UFP (device) */ |
| 1015 | if (port->data_role == TYPEC_DEVICE && |
| 1016 | port->nr_snk_vdo) { |
| 1017 | for (i = 0; i < port->nr_snk_vdo; i++) |
| 1018 | response[i + 1] = port->snk_vdo[i]; |
| 1019 | rlen = port->nr_snk_vdo + 1; |
| 1020 | } |
| 1021 | break; |
| 1022 | case CMD_DISCOVER_SVID: |
| 1023 | break; |
| 1024 | case CMD_DISCOVER_MODES: |
| 1025 | break; |
| 1026 | case CMD_ENTER_MODE: |
| 1027 | break; |
| 1028 | case CMD_EXIT_MODE: |
| 1029 | break; |
| 1030 | case CMD_ATTENTION: |
| 1031 | break; |
| 1032 | default: |
| 1033 | break; |
| 1034 | } |
| 1035 | if (rlen >= 1) { |
| 1036 | response[0] = p0 | VDO_CMDT(CMDT_RSP_ACK); |
| 1037 | } else if (rlen == 0) { |
| 1038 | response[0] = p0 | VDO_CMDT(CMDT_RSP_NAK); |
| 1039 | rlen = 1; |
| 1040 | } else { |
| 1041 | response[0] = p0 | VDO_CMDT(CMDT_RSP_BUSY); |
| 1042 | rlen = 1; |
| 1043 | } |
| 1044 | break; |
| 1045 | case CMDT_RSP_ACK: |
| 1046 | /* silently drop message if we are not connected */ |
| 1047 | if (!port->partner) |
| 1048 | break; |
| 1049 | |
| 1050 | switch (cmd) { |
| 1051 | case CMD_DISCOVER_IDENT: |
| 1052 | /* 6.4.4.3.1 */ |
| 1053 | svdm_consume_identity(port, payload, cnt); |
| 1054 | response[0] = VDO(USB_SID_PD, 1, CMD_DISCOVER_SVID); |
| 1055 | rlen = 1; |
| 1056 | break; |
| 1057 | case CMD_DISCOVER_SVID: |
| 1058 | /* 6.4.4.3.2 */ |
| 1059 | if (svdm_consume_svids(port, payload, cnt)) { |
| 1060 | response[0] = VDO(USB_SID_PD, 1, |
| 1061 | CMD_DISCOVER_SVID); |
| 1062 | rlen = 1; |
| 1063 | } else if (modep->nsvids && supports_modal(port)) { |
| 1064 | response[0] = VDO(modep->svids[0], 1, |
| 1065 | CMD_DISCOVER_MODES); |
| 1066 | rlen = 1; |
| 1067 | } |
| 1068 | break; |
| 1069 | case CMD_DISCOVER_MODES: |
| 1070 | /* 6.4.4.3.3 */ |
| 1071 | svdm_consume_modes(port, payload, cnt); |
| 1072 | modep->svid_index++; |
| 1073 | if (modep->svid_index < modep->nsvids) { |
| 1074 | svid = modep->svids[modep->svid_index]; |
| 1075 | response[0] = VDO(svid, 1, CMD_DISCOVER_MODES); |
| 1076 | rlen = 1; |
| 1077 | } else { |
| 1078 | #if 0 |
| 1079 | response[0] = pd_dfp_enter_mode(port, 0, 0); |
| 1080 | if (response[0]) |
| 1081 | rlen = 1; |
| 1082 | #endif |
| 1083 | } |
| 1084 | break; |
| 1085 | case CMD_ENTER_MODE: |
| 1086 | break; |
| 1087 | default: |
| 1088 | break; |
| 1089 | } |
| 1090 | break; |
| 1091 | default: |
| 1092 | break; |
| 1093 | } |
| 1094 | |
| 1095 | return rlen; |
| 1096 | } |
| 1097 | |
| 1098 | static void tcpm_handle_vdm_request(struct tcpm_port *port, |
| 1099 | const __le32 *payload, int cnt) |
| 1100 | { |
| 1101 | int rlen = 0; |
| 1102 | u32 response[8] = { }; |
| 1103 | u32 p0 = le32_to_cpu(payload[0]); |
| 1104 | |
| 1105 | if (port->vdm_state == VDM_STATE_BUSY) { |
| 1106 | /* If UFP responded busy retry after timeout */ |
| 1107 | if (PD_VDO_CMDT(p0) == CMDT_RSP_BUSY) { |
| 1108 | port->vdm_state = VDM_STATE_WAIT_RSP_BUSY; |
| 1109 | port->vdo_retry = (p0 & ~VDO_CMDT_MASK) | |
| 1110 | CMDT_INIT; |
| 1111 | mod_delayed_work(port->wq, &port->vdm_state_machine, |
| 1112 | msecs_to_jiffies(PD_T_VDM_BUSY)); |
| 1113 | return; |
| 1114 | } |
| 1115 | port->vdm_state = VDM_STATE_DONE; |
| 1116 | } |
| 1117 | |
| 1118 | if (PD_VDO_SVDM(p0)) |
| 1119 | rlen = tcpm_pd_svdm(port, payload, cnt, response); |
| 1120 | #if 0 |
| 1121 | else |
| 1122 | rlen = tcpm_pd_custom_vdm(port, cnt, payload, response); |
| 1123 | #endif |
| 1124 | |
| 1125 | if (rlen > 0) { |
| 1126 | tcpm_queue_vdm(port, response[0], &response[1], rlen - 1); |
| 1127 | mod_delayed_work(port->wq, &port->vdm_state_machine, 0); |
| 1128 | } |
| 1129 | } |
| 1130 | |
| 1131 | static void tcpm_send_vdm(struct tcpm_port *port, u32 vid, int cmd, |
| 1132 | const u32 *data, int count) |
| 1133 | { |
| 1134 | u32 header; |
| 1135 | |
| 1136 | if (WARN_ON(count > VDO_MAX_SIZE - 1)) |
| 1137 | count = VDO_MAX_SIZE - 1; |
| 1138 | |
| 1139 | /* set VDM header with VID & CMD */ |
| 1140 | header = VDO(vid, ((vid & USB_SID_PD) == USB_SID_PD) ? |
| 1141 | 1 : (PD_VDO_CMD(cmd) <= CMD_ATTENTION), cmd); |
| 1142 | tcpm_queue_vdm(port, header, data, count); |
| 1143 | |
| 1144 | mod_delayed_work(port->wq, &port->vdm_state_machine, 0); |
| 1145 | } |
| 1146 | |
| 1147 | static unsigned int vdm_ready_timeout(u32 vdm_hdr) |
| 1148 | { |
| 1149 | unsigned int timeout; |
| 1150 | int cmd = PD_VDO_CMD(vdm_hdr); |
| 1151 | |
| 1152 | /* its not a structured VDM command */ |
| 1153 | if (!PD_VDO_SVDM(vdm_hdr)) |
| 1154 | return PD_T_VDM_UNSTRUCTURED; |
| 1155 | |
| 1156 | switch (PD_VDO_CMDT(vdm_hdr)) { |
| 1157 | case CMDT_INIT: |
| 1158 | if (cmd == CMD_ENTER_MODE || cmd == CMD_EXIT_MODE) |
| 1159 | timeout = PD_T_VDM_WAIT_MODE_E; |
| 1160 | else |
| 1161 | timeout = PD_T_VDM_SNDR_RSP; |
| 1162 | break; |
| 1163 | default: |
| 1164 | if (cmd == CMD_ENTER_MODE || cmd == CMD_EXIT_MODE) |
| 1165 | timeout = PD_T_VDM_E_MODE; |
| 1166 | else |
| 1167 | timeout = PD_T_VDM_RCVR_RSP; |
| 1168 | break; |
| 1169 | } |
| 1170 | return timeout; |
| 1171 | } |
| 1172 | |
| 1173 | static void vdm_run_state_machine(struct tcpm_port *port) |
| 1174 | { |
| 1175 | struct pd_message msg; |
| 1176 | int i, res; |
| 1177 | |
| 1178 | switch (port->vdm_state) { |
| 1179 | case VDM_STATE_READY: |
| 1180 | /* Only transmit VDM if attached */ |
| 1181 | if (!port->attached) { |
| 1182 | port->vdm_state = VDM_STATE_ERR_BUSY; |
| 1183 | break; |
| 1184 | } |
| 1185 | |
| 1186 | /* |
| 1187 | * if there's traffic or we're not in PDO ready state don't send |
| 1188 | * a VDM. |
| 1189 | */ |
| 1190 | if (port->state != SRC_READY && port->state != SNK_READY) |
| 1191 | break; |
| 1192 | |
| 1193 | /* Prepare and send VDM */ |
| 1194 | memset(&msg, 0, sizeof(msg)); |
| 1195 | msg.header = PD_HEADER_LE(PD_DATA_VENDOR_DEF, |
| 1196 | port->pwr_role, |
| 1197 | port->data_role, |
| 1198 | port->message_id, port->vdo_count); |
| 1199 | for (i = 0; i < port->vdo_count; i++) |
| 1200 | msg.payload[i] = cpu_to_le32(port->vdo_data[i]); |
| 1201 | res = tcpm_pd_transmit(port, TCPC_TX_SOP, &msg); |
| 1202 | if (res < 0) { |
| 1203 | port->vdm_state = VDM_STATE_ERR_SEND; |
| 1204 | } else { |
| 1205 | unsigned long timeout; |
| 1206 | |
| 1207 | port->vdm_retries = 0; |
| 1208 | port->vdm_state = VDM_STATE_BUSY; |
| 1209 | timeout = vdm_ready_timeout(port->vdo_data[0]); |
| 1210 | mod_delayed_work(port->wq, &port->vdm_state_machine, |
| 1211 | timeout); |
| 1212 | } |
| 1213 | break; |
| 1214 | case VDM_STATE_WAIT_RSP_BUSY: |
| 1215 | port->vdo_data[0] = port->vdo_retry; |
| 1216 | port->vdo_count = 1; |
| 1217 | port->vdm_state = VDM_STATE_READY; |
| 1218 | break; |
| 1219 | case VDM_STATE_BUSY: |
| 1220 | port->vdm_state = VDM_STATE_ERR_TMOUT; |
| 1221 | break; |
| 1222 | case VDM_STATE_ERR_SEND: |
| 1223 | /* |
| 1224 | * A partner which does not support USB PD will not reply, |
| 1225 | * so this is not a fatal error. At the same time, some |
| 1226 | * devices may not return GoodCRC under some circumstances, |
| 1227 | * so we need to retry. |
| 1228 | */ |
| 1229 | if (port->vdm_retries < 3) { |
| 1230 | tcpm_log(port, "VDM Tx error, retry"); |
| 1231 | port->vdm_retries++; |
| 1232 | port->vdm_state = VDM_STATE_READY; |
| 1233 | } |
| 1234 | break; |
| 1235 | default: |
| 1236 | break; |
| 1237 | } |
| 1238 | } |
| 1239 | |
| 1240 | static void vdm_state_machine_work(struct work_struct *work) |
| 1241 | { |
| 1242 | struct tcpm_port *port = container_of(work, struct tcpm_port, |
| 1243 | vdm_state_machine.work); |
| 1244 | enum vdm_states prev_state; |
| 1245 | |
| 1246 | mutex_lock(&port->lock); |
| 1247 | |
| 1248 | /* |
| 1249 | * Continue running as long as the port is not busy and there was |
| 1250 | * a state change. |
| 1251 | */ |
| 1252 | do { |
| 1253 | prev_state = port->vdm_state; |
| 1254 | vdm_run_state_machine(port); |
| 1255 | } while (port->vdm_state != prev_state && |
| 1256 | port->vdm_state != VDM_STATE_BUSY); |
| 1257 | |
| 1258 | mutex_unlock(&port->lock); |
| 1259 | } |
| 1260 | |
| 1261 | /* |
| 1262 | * PD (data, control) command handling functions |
| 1263 | */ |
| 1264 | static void tcpm_pd_data_request(struct tcpm_port *port, |
| 1265 | const struct pd_message *msg) |
| 1266 | { |
| 1267 | enum pd_data_msg_type type = pd_header_type_le(msg->header); |
| 1268 | unsigned int cnt = pd_header_cnt_le(msg->header); |
| 1269 | unsigned int i; |
| 1270 | |
| 1271 | switch (type) { |
| 1272 | case PD_DATA_SOURCE_CAP: |
| 1273 | if (port->pwr_role != TYPEC_SINK) |
| 1274 | break; |
| 1275 | |
| 1276 | for (i = 0; i < cnt; i++) |
| 1277 | port->source_caps[i] = le32_to_cpu(msg->payload[i]); |
| 1278 | |
| 1279 | port->nr_source_caps = cnt; |
| 1280 | |
| 1281 | tcpm_log_source_caps(port); |
| 1282 | |
| 1283 | /* |
| 1284 | * This message may be received even if VBUS is not |
| 1285 | * present. This is quite unexpected; see USB PD |
| 1286 | * specification, sections 8.3.3.6.3.1 and 8.3.3.6.3.2. |
| 1287 | * However, at the same time, we must be ready to |
| 1288 | * receive this message and respond to it 15ms after |
| 1289 | * receiving PS_RDY during power swap operations, no matter |
| 1290 | * if VBUS is available or not (USB PD specification, |
| 1291 | * section 6.5.9.2). |
| 1292 | * So we need to accept the message either way, |
| 1293 | * but be prepared to keep waiting for VBUS after it was |
| 1294 | * handled. |
| 1295 | */ |
| 1296 | tcpm_set_state(port, SNK_NEGOTIATE_CAPABILITIES, 0); |
| 1297 | break; |
| 1298 | case PD_DATA_REQUEST: |
| 1299 | if (port->pwr_role != TYPEC_SOURCE || |
| 1300 | cnt != 1) { |
| 1301 | tcpm_queue_message(port, PD_MSG_CTRL_REJECT); |
| 1302 | break; |
| 1303 | } |
| 1304 | port->sink_request = le32_to_cpu(msg->payload[0]); |
| 1305 | tcpm_set_state(port, SRC_NEGOTIATE_CAPABILITIES, 0); |
| 1306 | break; |
| 1307 | case PD_DATA_SINK_CAP: |
| 1308 | /* We don't do anything with this at the moment... */ |
| 1309 | for (i = 0; i < cnt; i++) |
| 1310 | port->sink_caps[i] = le32_to_cpu(msg->payload[i]); |
| 1311 | port->nr_sink_caps = cnt; |
| 1312 | break; |
| 1313 | case PD_DATA_VENDOR_DEF: |
| 1314 | tcpm_handle_vdm_request(port, msg->payload, cnt); |
| 1315 | break; |
| 1316 | case PD_DATA_BIST: |
| 1317 | if (port->state == SRC_READY || port->state == SNK_READY) { |
| 1318 | port->bist_request = le32_to_cpu(msg->payload[0]); |
| 1319 | tcpm_set_state(port, BIST_RX, 0); |
| 1320 | } |
| 1321 | break; |
| 1322 | default: |
| 1323 | tcpm_log(port, "Unhandled data message type %#x", type); |
| 1324 | break; |
| 1325 | } |
| 1326 | } |
| 1327 | |
| 1328 | static void tcpm_pd_ctrl_request(struct tcpm_port *port, |
| 1329 | const struct pd_message *msg) |
| 1330 | { |
| 1331 | enum pd_ctrl_msg_type type = pd_header_type_le(msg->header); |
| 1332 | enum tcpm_state next_state; |
| 1333 | |
| 1334 | switch (type) { |
| 1335 | case PD_CTRL_GOOD_CRC: |
| 1336 | case PD_CTRL_PING: |
| 1337 | break; |
| 1338 | case PD_CTRL_GET_SOURCE_CAP: |
| 1339 | switch (port->state) { |
| 1340 | case SRC_READY: |
| 1341 | case SNK_READY: |
| 1342 | tcpm_queue_message(port, PD_MSG_DATA_SOURCE_CAP); |
| 1343 | break; |
| 1344 | default: |
| 1345 | tcpm_queue_message(port, PD_MSG_CTRL_REJECT); |
| 1346 | break; |
| 1347 | } |
| 1348 | break; |
| 1349 | case PD_CTRL_GET_SINK_CAP: |
| 1350 | switch (port->state) { |
| 1351 | case SRC_READY: |
| 1352 | case SNK_READY: |
| 1353 | tcpm_queue_message(port, PD_MSG_DATA_SINK_CAP); |
| 1354 | break; |
| 1355 | default: |
| 1356 | tcpm_queue_message(port, PD_MSG_CTRL_REJECT); |
| 1357 | break; |
| 1358 | } |
| 1359 | break; |
| 1360 | case PD_CTRL_GOTO_MIN: |
| 1361 | break; |
| 1362 | case PD_CTRL_PS_RDY: |
| 1363 | switch (port->state) { |
| 1364 | case SNK_TRANSITION_SINK: |
| 1365 | if (port->vbus_present) { |
| 1366 | tcpm_set_current_limit(port, |
| 1367 | port->current_limit, |
| 1368 | port->supply_voltage); |
| 1369 | tcpm_set_state(port, SNK_READY, 0); |
| 1370 | } else { |
| 1371 | /* |
| 1372 | * Seen after power swap. Keep waiting for VBUS |
| 1373 | * in a transitional state. |
| 1374 | */ |
| 1375 | tcpm_set_state(port, |
| 1376 | SNK_TRANSITION_SINK_VBUS, 0); |
| 1377 | } |
| 1378 | break; |
| 1379 | case PR_SWAP_SRC_SNK_SOURCE_OFF: |
| 1380 | tcpm_set_state(port, PR_SWAP_SRC_SNK_SINK_ON, 0); |
| 1381 | break; |
| 1382 | case PR_SWAP_SNK_SRC_SINK_OFF: |
| 1383 | tcpm_set_state(port, PR_SWAP_SNK_SRC_SOURCE_ON, 0); |
| 1384 | break; |
| 1385 | case VCONN_SWAP_WAIT_FOR_VCONN: |
| 1386 | tcpm_set_state(port, VCONN_SWAP_TURN_OFF_VCONN, 0); |
| 1387 | break; |
| 1388 | default: |
| 1389 | break; |
| 1390 | } |
| 1391 | break; |
| 1392 | case PD_CTRL_REJECT: |
| 1393 | case PD_CTRL_WAIT: |
| 1394 | switch (port->state) { |
| 1395 | case SNK_NEGOTIATE_CAPABILITIES: |
| 1396 | /* USB PD specification, Figure 8-43 */ |
| 1397 | if (port->explicit_contract) |
| 1398 | next_state = SNK_READY; |
| 1399 | else |
| 1400 | next_state = SNK_WAIT_CAPABILITIES; |
| 1401 | tcpm_set_state(port, next_state, 0); |
| 1402 | break; |
| 1403 | case DR_SWAP_SEND: |
| 1404 | port->swap_status = (type == PD_CTRL_WAIT ? |
| 1405 | -EAGAIN : -EOPNOTSUPP); |
| 1406 | tcpm_set_state(port, DR_SWAP_CANCEL, 0); |
| 1407 | break; |
| 1408 | case PR_SWAP_SEND: |
| 1409 | port->swap_status = (type == PD_CTRL_WAIT ? |
| 1410 | -EAGAIN : -EOPNOTSUPP); |
| 1411 | tcpm_set_state(port, PR_SWAP_CANCEL, 0); |
| 1412 | break; |
| 1413 | case VCONN_SWAP_SEND: |
| 1414 | port->swap_status = (type == PD_CTRL_WAIT ? |
| 1415 | -EAGAIN : -EOPNOTSUPP); |
| 1416 | tcpm_set_state(port, VCONN_SWAP_CANCEL, 0); |
| 1417 | break; |
| 1418 | default: |
| 1419 | break; |
| 1420 | } |
| 1421 | break; |
| 1422 | case PD_CTRL_ACCEPT: |
| 1423 | switch (port->state) { |
| 1424 | case SNK_NEGOTIATE_CAPABILITIES: |
| 1425 | tcpm_set_state(port, SNK_TRANSITION_SINK, 0); |
| 1426 | break; |
| 1427 | case SOFT_RESET_SEND: |
| 1428 | port->message_id = 0; |
| 1429 | port->rx_msgid = -1; |
| 1430 | if (port->pwr_role == TYPEC_SOURCE) |
| 1431 | next_state = SRC_SEND_CAPABILITIES; |
| 1432 | else |
| 1433 | next_state = SNK_WAIT_CAPABILITIES; |
| 1434 | tcpm_set_state(port, next_state, 0); |
| 1435 | break; |
| 1436 | case DR_SWAP_SEND: |
| 1437 | tcpm_set_state(port, DR_SWAP_CHANGE_DR, 0); |
| 1438 | break; |
| 1439 | case PR_SWAP_SEND: |
| 1440 | tcpm_set_state(port, PR_SWAP_START, 0); |
| 1441 | break; |
| 1442 | case VCONN_SWAP_SEND: |
| 1443 | tcpm_set_state(port, VCONN_SWAP_START, 0); |
| 1444 | break; |
| 1445 | default: |
| 1446 | break; |
| 1447 | } |
| 1448 | break; |
| 1449 | case PD_CTRL_SOFT_RESET: |
| 1450 | tcpm_set_state(port, SOFT_RESET, 0); |
| 1451 | break; |
| 1452 | case PD_CTRL_DR_SWAP: |
| 1453 | if (port->typec_caps.type != TYPEC_PORT_DRP) { |
| 1454 | tcpm_queue_message(port, PD_MSG_CTRL_REJECT); |
| 1455 | break; |
| 1456 | } |
| 1457 | /* |
| 1458 | * XXX |
| 1459 | * 6.3.9: If an alternate mode is active, a request to swap |
| 1460 | * alternate modes shall trigger a port reset. |
| 1461 | */ |
| 1462 | switch (port->state) { |
| 1463 | case SRC_READY: |
| 1464 | case SNK_READY: |
| 1465 | tcpm_set_state(port, DR_SWAP_ACCEPT, 0); |
| 1466 | break; |
| 1467 | default: |
| 1468 | tcpm_queue_message(port, PD_MSG_CTRL_WAIT); |
| 1469 | break; |
| 1470 | } |
| 1471 | break; |
| 1472 | case PD_CTRL_PR_SWAP: |
| 1473 | if (port->typec_caps.type != TYPEC_PORT_DRP) { |
| 1474 | tcpm_queue_message(port, PD_MSG_CTRL_REJECT); |
| 1475 | break; |
| 1476 | } |
| 1477 | switch (port->state) { |
| 1478 | case SRC_READY: |
| 1479 | case SNK_READY: |
| 1480 | tcpm_set_state(port, PR_SWAP_ACCEPT, 0); |
| 1481 | break; |
| 1482 | default: |
| 1483 | tcpm_queue_message(port, PD_MSG_CTRL_WAIT); |
| 1484 | break; |
| 1485 | } |
| 1486 | break; |
| 1487 | case PD_CTRL_VCONN_SWAP: |
| 1488 | switch (port->state) { |
| 1489 | case SRC_READY: |
| 1490 | case SNK_READY: |
| 1491 | tcpm_set_state(port, VCONN_SWAP_ACCEPT, 0); |
| 1492 | break; |
| 1493 | default: |
| 1494 | tcpm_queue_message(port, PD_MSG_CTRL_WAIT); |
| 1495 | break; |
| 1496 | } |
| 1497 | break; |
| 1498 | default: |
| 1499 | tcpm_log(port, "Unhandled ctrl message type %#x", type); |
| 1500 | break; |
| 1501 | } |
| 1502 | } |
| 1503 | |
| 1504 | static void tcpm_pd_rx_handler(struct work_struct *work) |
| 1505 | { |
| 1506 | struct pd_rx_event *event = container_of(work, |
| 1507 | struct pd_rx_event, work); |
| 1508 | const struct pd_message *msg = &event->msg; |
| 1509 | unsigned int cnt = pd_header_cnt_le(msg->header); |
| 1510 | struct tcpm_port *port = event->port; |
| 1511 | |
| 1512 | mutex_lock(&port->lock); |
| 1513 | |
| 1514 | tcpm_log(port, "PD RX, header: %#x [%d]", le16_to_cpu(msg->header), |
| 1515 | port->attached); |
| 1516 | |
| 1517 | if (port->attached) { |
| 1518 | enum pd_ctrl_msg_type type = pd_header_type_le(msg->header); |
| 1519 | unsigned int msgid = pd_header_msgid_le(msg->header); |
| 1520 | |
| 1521 | /* |
| 1522 | * USB PD standard, 6.6.1.2: |
| 1523 | * "... if MessageID value in a received Message is the |
| 1524 | * same as the stored value, the receiver shall return a |
| 1525 | * GoodCRC Message with that MessageID value and drop |
| 1526 | * the Message (this is a retry of an already received |
| 1527 | * Message). Note: this shall not apply to the Soft_Reset |
| 1528 | * Message which always has a MessageID value of zero." |
| 1529 | */ |
| 1530 | if (msgid == port->rx_msgid && type != PD_CTRL_SOFT_RESET) |
| 1531 | goto done; |
| 1532 | port->rx_msgid = msgid; |
| 1533 | |
| 1534 | /* |
| 1535 | * If both ends believe to be DFP/host, we have a data role |
| 1536 | * mismatch. |
| 1537 | */ |
| 1538 | if (!!(le16_to_cpu(msg->header) & PD_HEADER_DATA_ROLE) == |
| 1539 | (port->data_role == TYPEC_HOST)) { |
| 1540 | tcpm_log(port, |
| 1541 | "Data role mismatch, initiating error recovery"); |
| 1542 | tcpm_set_state(port, ERROR_RECOVERY, 0); |
| 1543 | } else { |
| 1544 | if (cnt) |
| 1545 | tcpm_pd_data_request(port, msg); |
| 1546 | else |
| 1547 | tcpm_pd_ctrl_request(port, msg); |
| 1548 | } |
| 1549 | } |
| 1550 | |
| 1551 | done: |
| 1552 | mutex_unlock(&port->lock); |
| 1553 | kfree(event); |
| 1554 | } |
| 1555 | |
| 1556 | void tcpm_pd_receive(struct tcpm_port *port, const struct pd_message *msg) |
| 1557 | { |
| 1558 | struct pd_rx_event *event; |
| 1559 | |
| 1560 | event = kzalloc(sizeof(*event), GFP_ATOMIC); |
| 1561 | if (!event) |
| 1562 | return; |
| 1563 | |
| 1564 | INIT_WORK(&event->work, tcpm_pd_rx_handler); |
| 1565 | event->port = port; |
| 1566 | memcpy(&event->msg, msg, sizeof(*msg)); |
| 1567 | queue_work(port->wq, &event->work); |
| 1568 | } |
| 1569 | EXPORT_SYMBOL_GPL(tcpm_pd_receive); |
| 1570 | |
| 1571 | static int tcpm_pd_send_control(struct tcpm_port *port, |
| 1572 | enum pd_ctrl_msg_type type) |
| 1573 | { |
| 1574 | struct pd_message msg; |
| 1575 | |
| 1576 | memset(&msg, 0, sizeof(msg)); |
| 1577 | msg.header = PD_HEADER_LE(type, port->pwr_role, |
| 1578 | port->data_role, |
| 1579 | port->message_id, 0); |
| 1580 | |
| 1581 | return tcpm_pd_transmit(port, TCPC_TX_SOP, &msg); |
| 1582 | } |
| 1583 | |
| 1584 | /* |
| 1585 | * Send queued message without affecting state. |
| 1586 | * Return true if state machine should go back to sleep, |
| 1587 | * false otherwise. |
| 1588 | */ |
| 1589 | static bool tcpm_send_queued_message(struct tcpm_port *port) |
| 1590 | { |
| 1591 | enum pd_msg_request queued_message; |
| 1592 | |
| 1593 | do { |
| 1594 | queued_message = port->queued_message; |
| 1595 | port->queued_message = PD_MSG_NONE; |
| 1596 | |
| 1597 | switch (queued_message) { |
| 1598 | case PD_MSG_CTRL_WAIT: |
| 1599 | tcpm_pd_send_control(port, PD_CTRL_WAIT); |
| 1600 | break; |
| 1601 | case PD_MSG_CTRL_REJECT: |
| 1602 | tcpm_pd_send_control(port, PD_CTRL_REJECT); |
| 1603 | break; |
| 1604 | case PD_MSG_DATA_SINK_CAP: |
| 1605 | tcpm_pd_send_sink_caps(port); |
| 1606 | break; |
| 1607 | case PD_MSG_DATA_SOURCE_CAP: |
| 1608 | tcpm_pd_send_source_caps(port); |
| 1609 | break; |
| 1610 | default: |
| 1611 | break; |
| 1612 | } |
| 1613 | } while (port->queued_message != PD_MSG_NONE); |
| 1614 | |
| 1615 | if (port->delayed_state != INVALID_STATE) { |
| 1616 | if (time_is_after_jiffies(port->delayed_runtime)) { |
| 1617 | mod_delayed_work(port->wq, &port->state_machine, |
| 1618 | port->delayed_runtime - jiffies); |
| 1619 | return true; |
| 1620 | } |
| 1621 | port->delayed_state = INVALID_STATE; |
| 1622 | } |
| 1623 | return false; |
| 1624 | } |
| 1625 | |
| 1626 | static int tcpm_pd_check_request(struct tcpm_port *port) |
| 1627 | { |
| 1628 | u32 pdo, rdo = port->sink_request; |
| 1629 | unsigned int max, op, pdo_max, index; |
| 1630 | enum pd_pdo_type type; |
| 1631 | |
| 1632 | index = rdo_index(rdo); |
| 1633 | if (!index || index > port->nr_src_pdo) |
| 1634 | return -EINVAL; |
| 1635 | |
| 1636 | pdo = port->src_pdo[index - 1]; |
| 1637 | type = pdo_type(pdo); |
| 1638 | switch (type) { |
| 1639 | case PDO_TYPE_FIXED: |
| 1640 | case PDO_TYPE_VAR: |
| 1641 | max = rdo_max_current(rdo); |
| 1642 | op = rdo_op_current(rdo); |
| 1643 | pdo_max = pdo_max_current(pdo); |
| 1644 | |
| 1645 | if (op > pdo_max) |
| 1646 | return -EINVAL; |
| 1647 | if (max > pdo_max && !(rdo & RDO_CAP_MISMATCH)) |
| 1648 | return -EINVAL; |
| 1649 | |
| 1650 | if (type == PDO_TYPE_FIXED) |
| 1651 | tcpm_log(port, |
| 1652 | "Requested %u mV, %u mA for %u / %u mA", |
| 1653 | pdo_fixed_voltage(pdo), pdo_max, op, max); |
| 1654 | else |
| 1655 | tcpm_log(port, |
| 1656 | "Requested %u -> %u mV, %u mA for %u / %u mA", |
| 1657 | pdo_min_voltage(pdo), pdo_max_voltage(pdo), |
| 1658 | pdo_max, op, max); |
| 1659 | break; |
| 1660 | case PDO_TYPE_BATT: |
| 1661 | max = rdo_max_power(rdo); |
| 1662 | op = rdo_op_power(rdo); |
| 1663 | pdo_max = pdo_max_power(pdo); |
| 1664 | |
| 1665 | if (op > pdo_max) |
| 1666 | return -EINVAL; |
| 1667 | if (max > pdo_max && !(rdo & RDO_CAP_MISMATCH)) |
| 1668 | return -EINVAL; |
| 1669 | tcpm_log(port, |
| 1670 | "Requested %u -> %u mV, %u mW for %u / %u mW", |
| 1671 | pdo_min_voltage(pdo), pdo_max_voltage(pdo), |
| 1672 | pdo_max, op, max); |
| 1673 | break; |
| 1674 | default: |
| 1675 | return -EINVAL; |
| 1676 | } |
| 1677 | |
| 1678 | port->op_vsafe5v = index == 1; |
| 1679 | |
| 1680 | return 0; |
| 1681 | } |
| 1682 | |
| 1683 | static int tcpm_pd_select_pdo(struct tcpm_port *port) |
| 1684 | { |
| 1685 | unsigned int i, max_mw = 0, max_mv = 0; |
| 1686 | int ret = -EINVAL; |
| 1687 | |
| 1688 | /* |
| 1689 | * Select the source PDO providing the most power while staying within |
| 1690 | * the board's voltage limits. Prefer PDO providing exp |
| 1691 | */ |
| 1692 | for (i = 0; i < port->nr_source_caps; i++) { |
| 1693 | u32 pdo = port->source_caps[i]; |
| 1694 | enum pd_pdo_type type = pdo_type(pdo); |
| 1695 | unsigned int mv, ma, mw; |
| 1696 | |
| 1697 | if (type == PDO_TYPE_FIXED) |
| 1698 | mv = pdo_fixed_voltage(pdo); |
| 1699 | else |
| 1700 | mv = pdo_min_voltage(pdo); |
| 1701 | |
| 1702 | if (type == PDO_TYPE_BATT) { |
| 1703 | mw = pdo_max_power(pdo); |
| 1704 | } else { |
| 1705 | ma = min(pdo_max_current(pdo), |
| 1706 | port->max_snk_ma); |
| 1707 | mw = ma * mv / 1000; |
| 1708 | } |
| 1709 | |
| 1710 | /* Perfer higher voltages if available */ |
| 1711 | if ((mw > max_mw || (mw == max_mw && mv > max_mv)) && |
| 1712 | mv <= port->max_snk_mv) { |
| 1713 | ret = i; |
| 1714 | max_mw = mw; |
| 1715 | max_mv = mv; |
| 1716 | } |
| 1717 | } |
| 1718 | |
| 1719 | return ret; |
| 1720 | } |
| 1721 | |
| 1722 | static int tcpm_pd_build_request(struct tcpm_port *port, u32 *rdo) |
| 1723 | { |
| 1724 | unsigned int mv, ma, mw, flags; |
| 1725 | unsigned int max_ma, max_mw; |
| 1726 | enum pd_pdo_type type; |
| 1727 | int index; |
| 1728 | u32 pdo; |
| 1729 | |
| 1730 | index = tcpm_pd_select_pdo(port); |
| 1731 | if (index < 0) |
| 1732 | return -EINVAL; |
| 1733 | pdo = port->source_caps[index]; |
| 1734 | type = pdo_type(pdo); |
| 1735 | |
| 1736 | if (type == PDO_TYPE_FIXED) |
| 1737 | mv = pdo_fixed_voltage(pdo); |
| 1738 | else |
| 1739 | mv = pdo_min_voltage(pdo); |
| 1740 | |
| 1741 | /* Select maximum available current within the board's power limit */ |
| 1742 | if (type == PDO_TYPE_BATT) { |
| 1743 | mw = pdo_max_power(pdo); |
| 1744 | ma = 1000 * min(mw, port->max_snk_mw) / mv; |
| 1745 | } else { |
| 1746 | ma = min(pdo_max_current(pdo), |
| 1747 | 1000 * port->max_snk_mw / mv); |
| 1748 | } |
| 1749 | ma = min(ma, port->max_snk_ma); |
| 1750 | |
| 1751 | flags = RDO_USB_COMM | RDO_NO_SUSPEND; |
| 1752 | |
| 1753 | /* Set mismatch bit if offered power is less than operating power */ |
| 1754 | mw = ma * mv / 1000; |
| 1755 | max_ma = ma; |
| 1756 | max_mw = mw; |
| 1757 | if (mw < port->operating_snk_mw) { |
| 1758 | flags |= RDO_CAP_MISMATCH; |
| 1759 | max_mw = port->operating_snk_mw; |
| 1760 | max_ma = max_mw * 1000 / mv; |
| 1761 | } |
| 1762 | |
| 1763 | tcpm_log(port, "cc=%d cc1=%d cc2=%d vbus=%d vconn=%s polarity=%d", |
| 1764 | port->cc_req, port->cc1, port->cc2, port->vbus_source, |
| 1765 | port->vconn_role == TYPEC_SOURCE ? "source" : "sink", |
| 1766 | port->polarity); |
| 1767 | |
| 1768 | if (type == PDO_TYPE_BATT) { |
| 1769 | *rdo = RDO_BATT(index + 1, mw, max_mw, flags); |
| 1770 | |
| 1771 | tcpm_log(port, "Requesting PDO %d: %u mV, %u mW%s", |
| 1772 | index, mv, mw, |
| 1773 | flags & RDO_CAP_MISMATCH ? " [mismatch]" : ""); |
| 1774 | } else { |
| 1775 | *rdo = RDO_FIXED(index + 1, ma, max_ma, flags); |
| 1776 | |
| 1777 | tcpm_log(port, "Requesting PDO %d: %u mV, %u mA%s", |
| 1778 | index, mv, ma, |
| 1779 | flags & RDO_CAP_MISMATCH ? " [mismatch]" : ""); |
| 1780 | } |
| 1781 | |
| 1782 | port->current_limit = ma; |
| 1783 | port->supply_voltage = mv; |
| 1784 | |
| 1785 | return 0; |
| 1786 | } |
| 1787 | |
| 1788 | static int tcpm_pd_send_request(struct tcpm_port *port) |
| 1789 | { |
| 1790 | struct pd_message msg; |
| 1791 | int ret; |
| 1792 | u32 rdo; |
| 1793 | |
| 1794 | ret = tcpm_pd_build_request(port, &rdo); |
| 1795 | if (ret < 0) |
| 1796 | return ret; |
| 1797 | |
| 1798 | memset(&msg, 0, sizeof(msg)); |
| 1799 | msg.header = PD_HEADER_LE(PD_DATA_REQUEST, |
| 1800 | port->pwr_role, |
| 1801 | port->data_role, |
| 1802 | port->message_id, 1); |
| 1803 | msg.payload[0] = cpu_to_le32(rdo); |
| 1804 | |
| 1805 | return tcpm_pd_transmit(port, TCPC_TX_SOP, &msg); |
| 1806 | } |
| 1807 | |
| 1808 | static int tcpm_set_vbus(struct tcpm_port *port, bool enable) |
| 1809 | { |
| 1810 | int ret; |
| 1811 | |
| 1812 | if (enable && port->vbus_charge) |
| 1813 | return -EINVAL; |
| 1814 | |
| 1815 | tcpm_log(port, "vbus:=%d charge=%d", enable, port->vbus_charge); |
| 1816 | |
| 1817 | ret = port->tcpc->set_vbus(port->tcpc, enable, port->vbus_charge); |
| 1818 | if (ret < 0) |
| 1819 | return ret; |
| 1820 | |
| 1821 | port->vbus_source = enable; |
| 1822 | return 0; |
| 1823 | } |
| 1824 | |
| 1825 | static int tcpm_set_charge(struct tcpm_port *port, bool charge) |
| 1826 | { |
| 1827 | int ret; |
| 1828 | |
| 1829 | if (charge && port->vbus_source) |
| 1830 | return -EINVAL; |
| 1831 | |
| 1832 | if (charge != port->vbus_charge) { |
| 1833 | tcpm_log(port, "vbus=%d charge:=%d", port->vbus_source, charge); |
| 1834 | ret = port->tcpc->set_vbus(port->tcpc, port->vbus_source, |
| 1835 | charge); |
| 1836 | if (ret < 0) |
| 1837 | return ret; |
| 1838 | } |
| 1839 | port->vbus_charge = charge; |
| 1840 | return 0; |
| 1841 | } |
| 1842 | |
| 1843 | static bool tcpm_start_drp_toggling(struct tcpm_port *port) |
| 1844 | { |
| 1845 | int ret; |
| 1846 | |
| 1847 | if (port->tcpc->start_drp_toggling && |
| 1848 | port->typec_caps.type == TYPEC_PORT_DRP) { |
| 1849 | tcpm_log_force(port, "Start DRP toggling"); |
| 1850 | ret = port->tcpc->start_drp_toggling(port->tcpc, |
| 1851 | tcpm_rp_cc(port)); |
| 1852 | if (!ret) |
| 1853 | return true; |
| 1854 | } |
| 1855 | |
| 1856 | return false; |
| 1857 | } |
| 1858 | |
| 1859 | static void tcpm_set_cc(struct tcpm_port *port, enum typec_cc_status cc) |
| 1860 | { |
| 1861 | tcpm_log(port, "cc:=%d", cc); |
| 1862 | port->cc_req = cc; |
| 1863 | port->tcpc->set_cc(port->tcpc, cc); |
| 1864 | } |
| 1865 | |
| 1866 | static int tcpm_init_vbus(struct tcpm_port *port) |
| 1867 | { |
| 1868 | int ret; |
| 1869 | |
| 1870 | ret = port->tcpc->set_vbus(port->tcpc, false, false); |
| 1871 | port->vbus_source = false; |
| 1872 | port->vbus_charge = false; |
| 1873 | return ret; |
| 1874 | } |
| 1875 | |
| 1876 | static int tcpm_init_vconn(struct tcpm_port *port) |
| 1877 | { |
| 1878 | int ret; |
| 1879 | |
| 1880 | ret = port->tcpc->set_vconn(port->tcpc, false); |
| 1881 | port->vconn_role = TYPEC_SINK; |
| 1882 | return ret; |
| 1883 | } |
| 1884 | |
| 1885 | static void tcpm_typec_connect(struct tcpm_port *port) |
| 1886 | { |
| 1887 | if (!port->connected) { |
| 1888 | /* Make sure we don't report stale identity information */ |
| 1889 | memset(&port->partner_ident, 0, sizeof(port->partner_ident)); |
| 1890 | port->partner_desc.usb_pd = port->pd_capable; |
| 1891 | if (tcpm_port_is_debug(port)) |
| 1892 | port->partner_desc.accessory = TYPEC_ACCESSORY_DEBUG; |
| 1893 | else if (tcpm_port_is_audio(port)) |
| 1894 | port->partner_desc.accessory = TYPEC_ACCESSORY_AUDIO; |
| 1895 | else |
| 1896 | port->partner_desc.accessory = TYPEC_ACCESSORY_NONE; |
| 1897 | port->partner = typec_register_partner(port->typec_port, |
| 1898 | &port->partner_desc); |
| 1899 | port->connected = true; |
| 1900 | } |
| 1901 | } |
| 1902 | |
| 1903 | static int tcpm_src_attach(struct tcpm_port *port) |
| 1904 | { |
| 1905 | enum typec_cc_polarity polarity = |
| 1906 | port->cc2 == TYPEC_CC_RD ? TYPEC_POLARITY_CC2 |
| 1907 | : TYPEC_POLARITY_CC1; |
| 1908 | int ret; |
| 1909 | |
| 1910 | if (port->attached) |
| 1911 | return 0; |
| 1912 | |
| 1913 | ret = tcpm_set_polarity(port, polarity); |
| 1914 | if (ret < 0) |
| 1915 | return ret; |
| 1916 | |
| 1917 | ret = tcpm_set_roles(port, true, TYPEC_SOURCE, TYPEC_HOST); |
| 1918 | if (ret < 0) |
| 1919 | return ret; |
| 1920 | |
| 1921 | ret = port->tcpc->set_pd_rx(port->tcpc, true); |
| 1922 | if (ret < 0) |
| 1923 | goto out_disable_mux; |
| 1924 | |
| 1925 | /* |
| 1926 | * USB Type-C specification, version 1.2, |
| 1927 | * chapter 4.5.2.2.8.1 (Attached.SRC Requirements) |
| 1928 | * Enable VCONN only if the non-RD port is set to RA. |
| 1929 | */ |
| 1930 | if ((polarity == TYPEC_POLARITY_CC1 && port->cc2 == TYPEC_CC_RA) || |
| 1931 | (polarity == TYPEC_POLARITY_CC2 && port->cc1 == TYPEC_CC_RA)) { |
| 1932 | ret = tcpm_set_vconn(port, true); |
| 1933 | if (ret < 0) |
| 1934 | goto out_disable_pd; |
| 1935 | } |
| 1936 | |
| 1937 | ret = tcpm_set_vbus(port, true); |
| 1938 | if (ret < 0) |
| 1939 | goto out_disable_vconn; |
| 1940 | |
| 1941 | port->pd_capable = false; |
| 1942 | |
| 1943 | port->partner = NULL; |
| 1944 | |
| 1945 | port->attached = true; |
| 1946 | port->send_discover = true; |
| 1947 | |
| 1948 | return 0; |
| 1949 | |
| 1950 | out_disable_vconn: |
| 1951 | tcpm_set_vconn(port, false); |
| 1952 | out_disable_pd: |
| 1953 | port->tcpc->set_pd_rx(port->tcpc, false); |
| 1954 | out_disable_mux: |
| 1955 | tcpm_mux_set(port, TYPEC_MUX_NONE, TCPC_USB_SWITCH_DISCONNECT); |
| 1956 | return ret; |
| 1957 | } |
| 1958 | |
| 1959 | static void tcpm_typec_disconnect(struct tcpm_port *port) |
| 1960 | { |
| 1961 | if (port->connected) { |
| 1962 | typec_unregister_partner(port->partner); |
| 1963 | port->partner = NULL; |
| 1964 | port->connected = false; |
| 1965 | } |
| 1966 | } |
| 1967 | |
| 1968 | static void tcpm_unregister_altmodes(struct tcpm_port *port) |
| 1969 | { |
| 1970 | struct pd_mode_data *modep = &port->mode_data; |
| 1971 | int i; |
| 1972 | |
| 1973 | for (i = 0; i < modep->altmodes; i++) { |
| 1974 | typec_unregister_altmode(port->partner_altmode[i]); |
| 1975 | port->partner_altmode[i] = NULL; |
| 1976 | } |
| 1977 | |
| 1978 | memset(modep, 0, sizeof(*modep)); |
| 1979 | } |
| 1980 | |
| 1981 | static void tcpm_reset_port(struct tcpm_port *port) |
| 1982 | { |
| 1983 | tcpm_unregister_altmodes(port); |
| 1984 | tcpm_typec_disconnect(port); |
| 1985 | port->attached = false; |
| 1986 | port->pd_capable = false; |
| 1987 | |
| 1988 | /* |
| 1989 | * First Rx ID should be 0; set this to a sentinel of -1 so that |
| 1990 | * we can check tcpm_pd_rx_handler() if we had seen it before. |
| 1991 | */ |
| 1992 | port->rx_msgid = -1; |
| 1993 | |
| 1994 | port->tcpc->set_pd_rx(port->tcpc, false); |
| 1995 | tcpm_init_vbus(port); /* also disables charging */ |
| 1996 | tcpm_init_vconn(port); |
| 1997 | tcpm_set_current_limit(port, 0, 0); |
| 1998 | tcpm_set_polarity(port, TYPEC_POLARITY_CC1); |
| 1999 | tcpm_set_attached_state(port, false); |
| 2000 | port->try_src_count = 0; |
| 2001 | port->try_snk_count = 0; |
| 2002 | } |
| 2003 | |
| 2004 | static void tcpm_detach(struct tcpm_port *port) |
| 2005 | { |
| 2006 | if (!port->attached) |
| 2007 | return; |
| 2008 | |
| 2009 | if (tcpm_port_is_disconnected(port)) |
| 2010 | port->hard_reset_count = 0; |
| 2011 | |
| 2012 | tcpm_reset_port(port); |
| 2013 | } |
| 2014 | |
| 2015 | static void tcpm_src_detach(struct tcpm_port *port) |
| 2016 | { |
| 2017 | tcpm_detach(port); |
| 2018 | } |
| 2019 | |
| 2020 | static int tcpm_snk_attach(struct tcpm_port *port) |
| 2021 | { |
| 2022 | int ret; |
| 2023 | |
| 2024 | if (port->attached) |
| 2025 | return 0; |
| 2026 | |
| 2027 | ret = tcpm_set_polarity(port, port->cc2 != TYPEC_CC_OPEN ? |
| 2028 | TYPEC_POLARITY_CC2 : TYPEC_POLARITY_CC1); |
| 2029 | if (ret < 0) |
| 2030 | return ret; |
| 2031 | |
| 2032 | ret = tcpm_set_roles(port, true, TYPEC_SINK, TYPEC_DEVICE); |
| 2033 | if (ret < 0) |
| 2034 | return ret; |
| 2035 | |
| 2036 | port->pd_capable = false; |
| 2037 | |
| 2038 | port->partner = NULL; |
| 2039 | |
| 2040 | port->attached = true; |
| 2041 | port->send_discover = true; |
| 2042 | |
| 2043 | return 0; |
| 2044 | } |
| 2045 | |
| 2046 | static void tcpm_snk_detach(struct tcpm_port *port) |
| 2047 | { |
| 2048 | tcpm_detach(port); |
| 2049 | |
| 2050 | /* XXX: (Dis)connect SuperSpeed mux? */ |
| 2051 | } |
| 2052 | |
| 2053 | static int tcpm_acc_attach(struct tcpm_port *port) |
| 2054 | { |
| 2055 | int ret; |
| 2056 | |
| 2057 | if (port->attached) |
| 2058 | return 0; |
| 2059 | |
| 2060 | ret = tcpm_set_roles(port, true, TYPEC_SOURCE, TYPEC_HOST); |
| 2061 | if (ret < 0) |
| 2062 | return ret; |
| 2063 | |
| 2064 | port->partner = NULL; |
| 2065 | |
| 2066 | tcpm_typec_connect(port); |
| 2067 | |
| 2068 | port->attached = true; |
| 2069 | |
| 2070 | return 0; |
| 2071 | } |
| 2072 | |
| 2073 | static void tcpm_acc_detach(struct tcpm_port *port) |
| 2074 | { |
| 2075 | tcpm_detach(port); |
| 2076 | } |
| 2077 | |
| 2078 | static inline enum tcpm_state hard_reset_state(struct tcpm_port *port) |
| 2079 | { |
| 2080 | if (port->hard_reset_count < PD_N_HARD_RESET_COUNT) |
| 2081 | return HARD_RESET_SEND; |
| 2082 | if (port->pd_capable) |
| 2083 | return ERROR_RECOVERY; |
| 2084 | if (port->pwr_role == TYPEC_SOURCE) |
| 2085 | return SRC_UNATTACHED; |
| 2086 | if (port->state == SNK_WAIT_CAPABILITIES) |
| 2087 | return SNK_READY; |
| 2088 | return SNK_UNATTACHED; |
| 2089 | } |
| 2090 | |
| 2091 | static inline enum tcpm_state ready_state(struct tcpm_port *port) |
| 2092 | { |
| 2093 | if (port->pwr_role == TYPEC_SOURCE) |
| 2094 | return SRC_READY; |
| 2095 | else |
| 2096 | return SNK_READY; |
| 2097 | } |
| 2098 | |
| 2099 | static inline enum tcpm_state unattached_state(struct tcpm_port *port) |
| 2100 | { |
| 2101 | if (port->pwr_role == TYPEC_SOURCE) |
| 2102 | return SRC_UNATTACHED; |
| 2103 | else |
| 2104 | return SNK_UNATTACHED; |
| 2105 | } |
| 2106 | |
| 2107 | static void tcpm_check_send_discover(struct tcpm_port *port) |
| 2108 | { |
| 2109 | if (port->data_role == TYPEC_HOST && port->send_discover && |
| 2110 | port->pd_capable) { |
| 2111 | tcpm_send_vdm(port, USB_SID_PD, CMD_DISCOVER_IDENT, NULL, 0); |
| 2112 | port->send_discover = false; |
| 2113 | } |
| 2114 | } |
| 2115 | |
| 2116 | static void tcpm_swap_complete(struct tcpm_port *port, int result) |
| 2117 | { |
| 2118 | if (port->swap_pending) { |
| 2119 | port->swap_status = result; |
| 2120 | port->swap_pending = false; |
| 2121 | complete(&port->swap_complete); |
| 2122 | } |
| 2123 | } |
| 2124 | |
| 2125 | static void run_state_machine(struct tcpm_port *port) |
| 2126 | { |
| 2127 | int ret; |
| 2128 | |
| 2129 | port->enter_state = port->state; |
| 2130 | switch (port->state) { |
| 2131 | case DRP_TOGGLING: |
| 2132 | break; |
| 2133 | /* SRC states */ |
| 2134 | case SRC_UNATTACHED: |
| 2135 | tcpm_swap_complete(port, -ENOTCONN); |
| 2136 | tcpm_src_detach(port); |
| 2137 | if (tcpm_start_drp_toggling(port)) { |
| 2138 | tcpm_set_state(port, DRP_TOGGLING, 0); |
| 2139 | break; |
| 2140 | } |
| 2141 | tcpm_set_cc(port, tcpm_rp_cc(port)); |
| 2142 | if (port->typec_caps.type == TYPEC_PORT_DRP) |
| 2143 | tcpm_set_state(port, SNK_UNATTACHED, PD_T_DRP_SNK); |
| 2144 | break; |
| 2145 | case SRC_ATTACH_WAIT: |
| 2146 | if (tcpm_port_is_debug(port)) |
| 2147 | tcpm_set_state(port, DEBUG_ACC_ATTACHED, |
| 2148 | PD_T_CC_DEBOUNCE); |
| 2149 | else if (tcpm_port_is_audio(port)) |
| 2150 | tcpm_set_state(port, AUDIO_ACC_ATTACHED, |
| 2151 | PD_T_CC_DEBOUNCE); |
| 2152 | else if (tcpm_port_is_source(port)) |
| 2153 | tcpm_set_state(port, |
| 2154 | tcpm_try_snk(port) ? SNK_TRY |
| 2155 | : SRC_ATTACHED, |
| 2156 | PD_T_CC_DEBOUNCE); |
| 2157 | break; |
| 2158 | |
| 2159 | case SNK_TRY: |
| 2160 | port->try_snk_count++; |
| 2161 | /* |
| 2162 | * Requirements: |
| 2163 | * - Do not drive vconn or vbus |
| 2164 | * - Terminate CC pins (both) to Rd |
| 2165 | * Action: |
| 2166 | * - Wait for tDRPTry (PD_T_DRP_TRY). |
| 2167 | * Until then, ignore any state changes. |
| 2168 | */ |
| 2169 | tcpm_set_cc(port, TYPEC_CC_RD); |
| 2170 | tcpm_set_state(port, SNK_TRY_WAIT, PD_T_DRP_TRY); |
| 2171 | break; |
| 2172 | case SNK_TRY_WAIT: |
| 2173 | if (port->vbus_present && tcpm_port_is_sink(port)) { |
| 2174 | tcpm_set_state(port, SNK_ATTACHED, 0); |
| 2175 | break; |
| 2176 | } |
| 2177 | if (!tcpm_port_is_sink(port)) { |
| 2178 | tcpm_set_state(port, SRC_TRYWAIT, |
| 2179 | PD_T_PD_DEBOUNCE); |
| 2180 | break; |
| 2181 | } |
| 2182 | /* No vbus, cc state is sink or open */ |
| 2183 | tcpm_set_state(port, SRC_TRYWAIT_UNATTACHED, PD_T_DRP_TRYWAIT); |
| 2184 | break; |
| 2185 | case SRC_TRYWAIT: |
| 2186 | tcpm_set_cc(port, tcpm_rp_cc(port)); |
| 2187 | if (!port->vbus_present && tcpm_port_is_source(port)) |
| 2188 | tcpm_set_state(port, SRC_ATTACHED, PD_T_CC_DEBOUNCE); |
| 2189 | else |
| 2190 | tcpm_set_state(port, SRC_TRYWAIT_UNATTACHED, |
| 2191 | PD_T_DRP_TRY); |
| 2192 | break; |
| 2193 | case SRC_TRYWAIT_UNATTACHED: |
| 2194 | tcpm_set_state(port, SNK_UNATTACHED, 0); |
| 2195 | break; |
| 2196 | |
| 2197 | case SRC_ATTACHED: |
| 2198 | ret = tcpm_src_attach(port); |
| 2199 | tcpm_set_state(port, SRC_UNATTACHED, |
| 2200 | ret < 0 ? 0 : PD_T_PS_SOURCE_ON); |
| 2201 | break; |
| 2202 | case SRC_STARTUP: |
| 2203 | typec_set_pwr_opmode(port->typec_port, TYPEC_PWR_MODE_USB); |
| 2204 | port->pwr_opmode = TYPEC_PWR_MODE_USB; |
| 2205 | port->caps_count = 0; |
| 2206 | port->message_id = 0; |
| 2207 | port->rx_msgid = -1; |
| 2208 | port->explicit_contract = false; |
| 2209 | tcpm_set_state(port, SRC_SEND_CAPABILITIES, 0); |
| 2210 | break; |
| 2211 | case SRC_SEND_CAPABILITIES: |
| 2212 | port->caps_count++; |
| 2213 | if (port->caps_count > PD_N_CAPS_COUNT) { |
| 2214 | tcpm_set_state(port, SRC_READY, 0); |
| 2215 | break; |
| 2216 | } |
| 2217 | ret = tcpm_pd_send_source_caps(port); |
| 2218 | if (ret < 0) { |
| 2219 | tcpm_set_state(port, SRC_SEND_CAPABILITIES, |
| 2220 | PD_T_SEND_SOURCE_CAP); |
| 2221 | } else { |
| 2222 | /* |
| 2223 | * Per standard, we should clear the reset counter here. |
| 2224 | * However, that can result in state machine hang-ups. |
| 2225 | * Reset it only in READY state to improve stability. |
| 2226 | */ |
| 2227 | /* port->hard_reset_count = 0; */ |
| 2228 | port->caps_count = 0; |
| 2229 | port->pd_capable = true; |
| 2230 | tcpm_set_state_cond(port, hard_reset_state(port), |
| 2231 | PD_T_SEND_SOURCE_CAP); |
| 2232 | } |
| 2233 | break; |
| 2234 | case SRC_NEGOTIATE_CAPABILITIES: |
| 2235 | ret = tcpm_pd_check_request(port); |
| 2236 | if (ret < 0) { |
| 2237 | tcpm_pd_send_control(port, PD_CTRL_REJECT); |
| 2238 | if (!port->explicit_contract) { |
| 2239 | tcpm_set_state(port, |
| 2240 | SRC_WAIT_NEW_CAPABILITIES, 0); |
| 2241 | } else { |
| 2242 | tcpm_set_state(port, SRC_READY, 0); |
| 2243 | } |
| 2244 | } else { |
| 2245 | tcpm_pd_send_control(port, PD_CTRL_ACCEPT); |
| 2246 | tcpm_set_state(port, SRC_TRANSITION_SUPPLY, |
| 2247 | PD_T_SRC_TRANSITION); |
| 2248 | } |
| 2249 | break; |
| 2250 | case SRC_TRANSITION_SUPPLY: |
| 2251 | /* XXX: regulator_set_voltage(vbus, ...) */ |
| 2252 | tcpm_pd_send_control(port, PD_CTRL_PS_RDY); |
| 2253 | port->explicit_contract = true; |
| 2254 | typec_set_pwr_opmode(port->typec_port, TYPEC_PWR_MODE_PD); |
| 2255 | port->pwr_opmode = TYPEC_PWR_MODE_PD; |
| 2256 | tcpm_set_state_cond(port, SRC_READY, 0); |
| 2257 | break; |
| 2258 | case SRC_READY: |
| 2259 | #if 1 |
| 2260 | port->hard_reset_count = 0; |
| 2261 | #endif |
| 2262 | port->try_src_count = 0; |
| 2263 | |
| 2264 | tcpm_swap_complete(port, 0); |
| 2265 | tcpm_typec_connect(port); |
| 2266 | tcpm_check_send_discover(port); |
| 2267 | /* |
| 2268 | * 6.3.5 |
| 2269 | * Sending ping messages is not necessary if |
| 2270 | * - the source operates at vSafe5V |
| 2271 | * or |
| 2272 | * - The system is not operating in PD mode |
| 2273 | * or |
| 2274 | * - Both partners are connected using a Type-C connector |
| 2275 | * XXX How do we know that ? |
| 2276 | */ |
| 2277 | if (port->pwr_opmode == TYPEC_PWR_MODE_PD && |
| 2278 | !port->op_vsafe5v) { |
| 2279 | tcpm_pd_send_control(port, PD_CTRL_PING); |
| 2280 | tcpm_set_state_cond(port, SRC_READY, |
| 2281 | PD_T_SOURCE_ACTIVITY); |
| 2282 | } |
| 2283 | break; |
| 2284 | case SRC_WAIT_NEW_CAPABILITIES: |
| 2285 | /* Nothing to do... */ |
| 2286 | break; |
| 2287 | |
| 2288 | /* SNK states */ |
| 2289 | case SNK_UNATTACHED: |
| 2290 | tcpm_swap_complete(port, -ENOTCONN); |
| 2291 | tcpm_snk_detach(port); |
| 2292 | if (tcpm_start_drp_toggling(port)) { |
| 2293 | tcpm_set_state(port, DRP_TOGGLING, 0); |
| 2294 | break; |
| 2295 | } |
| 2296 | tcpm_set_cc(port, TYPEC_CC_RD); |
| 2297 | if (port->typec_caps.type == TYPEC_PORT_DRP) |
| 2298 | tcpm_set_state(port, SRC_UNATTACHED, PD_T_DRP_SRC); |
| 2299 | break; |
| 2300 | case SNK_ATTACH_WAIT: |
| 2301 | if ((port->cc1 == TYPEC_CC_OPEN && |
| 2302 | port->cc2 != TYPEC_CC_OPEN) || |
| 2303 | (port->cc1 != TYPEC_CC_OPEN && |
| 2304 | port->cc2 == TYPEC_CC_OPEN)) |
| 2305 | tcpm_set_state(port, SNK_DEBOUNCED, |
| 2306 | PD_T_CC_DEBOUNCE); |
| 2307 | else if (tcpm_port_is_disconnected(port)) |
| 2308 | tcpm_set_state(port, SNK_UNATTACHED, |
| 2309 | PD_T_PD_DEBOUNCE); |
| 2310 | break; |
| 2311 | case SNK_DEBOUNCED: |
| 2312 | if (tcpm_port_is_disconnected(port)) |
| 2313 | tcpm_set_state(port, SNK_UNATTACHED, |
| 2314 | PD_T_PD_DEBOUNCE); |
| 2315 | else if (port->vbus_present) |
| 2316 | tcpm_set_state(port, |
| 2317 | tcpm_try_src(port) ? SRC_TRY |
| 2318 | : SNK_ATTACHED, |
| 2319 | 0); |
| 2320 | else |
| 2321 | /* Wait for VBUS, but not forever */ |
| 2322 | tcpm_set_state(port, SNK_UNATTACHED, PD_T_PS_SOURCE_ON); |
| 2323 | break; |
| 2324 | |
| 2325 | case SRC_TRY: |
| 2326 | port->try_src_count++; |
| 2327 | tcpm_set_cc(port, tcpm_rp_cc(port)); |
| 2328 | tcpm_set_state(port, SNK_TRYWAIT, PD_T_DRP_TRY); |
| 2329 | break; |
| 2330 | case SRC_TRY_DEBOUNCE: |
| 2331 | tcpm_set_state(port, SRC_ATTACHED, PD_T_PD_DEBOUNCE); |
| 2332 | break; |
| 2333 | case SNK_TRYWAIT: |
| 2334 | tcpm_set_cc(port, TYPEC_CC_RD); |
| 2335 | tcpm_set_state(port, SNK_TRYWAIT_DEBOUNCE, PD_T_CC_DEBOUNCE); |
| 2336 | break; |
| 2337 | case SNK_TRYWAIT_DEBOUNCE: |
| 2338 | if (port->vbus_present) { |
| 2339 | tcpm_set_state(port, SNK_ATTACHED, 0); |
| 2340 | break; |
| 2341 | } |
| 2342 | if (tcpm_port_is_disconnected(port)) { |
| 2343 | tcpm_set_state(port, SNK_UNATTACHED, |
| 2344 | PD_T_PD_DEBOUNCE); |
| 2345 | break; |
| 2346 | } |
| 2347 | if (tcpm_port_is_source(port)) |
| 2348 | tcpm_set_state(port, SRC_ATTACHED, 0); |
| 2349 | /* XXX Are we supposed to stay in this state ? */ |
| 2350 | break; |
| 2351 | case SNK_TRYWAIT_VBUS: |
| 2352 | tcpm_set_state(port, SNK_ATTACHED, PD_T_CC_DEBOUNCE); |
| 2353 | break; |
| 2354 | |
| 2355 | case SNK_ATTACHED: |
| 2356 | ret = tcpm_snk_attach(port); |
| 2357 | if (ret < 0) |
| 2358 | tcpm_set_state(port, SNK_UNATTACHED, 0); |
| 2359 | else |
| 2360 | tcpm_set_state(port, SNK_STARTUP, 0); |
| 2361 | break; |
| 2362 | case SNK_STARTUP: |
| 2363 | /* XXX: callback into infrastructure */ |
| 2364 | typec_set_pwr_opmode(port->typec_port, TYPEC_PWR_MODE_USB); |
| 2365 | port->pwr_opmode = TYPEC_PWR_MODE_USB; |
| 2366 | port->message_id = 0; |
| 2367 | port->rx_msgid = -1; |
| 2368 | port->explicit_contract = false; |
| 2369 | tcpm_set_state(port, SNK_DISCOVERY, 0); |
| 2370 | break; |
| 2371 | case SNK_DISCOVERY: |
| 2372 | if (port->vbus_present) { |
| 2373 | tcpm_set_current_limit(port, |
| 2374 | tcpm_get_current_limit(port), |
| 2375 | 5000); |
| 2376 | tcpm_set_charge(port, true); |
| 2377 | tcpm_set_state(port, SNK_WAIT_CAPABILITIES, 0); |
| 2378 | break; |
| 2379 | } |
| 2380 | /* |
| 2381 | * For DRP, timeouts differ. Also, handling is supposed to be |
| 2382 | * different and much more complex (dead battery detection; |
| 2383 | * see USB power delivery specification, section 8.3.3.6.1.5.1). |
| 2384 | */ |
| 2385 | tcpm_set_state(port, hard_reset_state(port), |
| 2386 | port->typec_caps.type == TYPEC_PORT_DRP ? |
| 2387 | PD_T_DB_DETECT : PD_T_NO_RESPONSE); |
| 2388 | break; |
| 2389 | case SNK_DISCOVERY_DEBOUNCE: |
| 2390 | tcpm_set_state(port, SNK_DISCOVERY_DEBOUNCE_DONE, |
| 2391 | PD_T_CC_DEBOUNCE); |
| 2392 | break; |
| 2393 | case SNK_DISCOVERY_DEBOUNCE_DONE: |
| 2394 | if (!tcpm_port_is_disconnected(port) && |
| 2395 | tcpm_port_is_sink(port) && |
| 2396 | time_is_after_jiffies(port->delayed_runtime)) { |
| 2397 | tcpm_set_state(port, SNK_DISCOVERY, |
| 2398 | port->delayed_runtime - jiffies); |
| 2399 | break; |
| 2400 | } |
| 2401 | tcpm_set_state(port, unattached_state(port), 0); |
| 2402 | break; |
| 2403 | case SNK_WAIT_CAPABILITIES: |
| 2404 | ret = port->tcpc->set_pd_rx(port->tcpc, true); |
| 2405 | if (ret < 0) { |
| 2406 | tcpm_set_state(port, SNK_READY, 0); |
| 2407 | break; |
| 2408 | } |
| 2409 | /* |
| 2410 | * If VBUS has never been low, and we time out waiting |
| 2411 | * for source cap, try a soft reset first, in case we |
| 2412 | * were already in a stable contract before this boot. |
| 2413 | * Do this only once. |
| 2414 | */ |
| 2415 | if (port->vbus_never_low) { |
| 2416 | port->vbus_never_low = false; |
| 2417 | tcpm_set_state(port, SOFT_RESET_SEND, |
| 2418 | PD_T_SINK_WAIT_CAP); |
| 2419 | } else { |
| 2420 | tcpm_set_state(port, hard_reset_state(port), |
| 2421 | PD_T_SINK_WAIT_CAP); |
| 2422 | } |
| 2423 | break; |
| 2424 | case SNK_NEGOTIATE_CAPABILITIES: |
| 2425 | port->pd_capable = true; |
| 2426 | port->hard_reset_count = 0; |
| 2427 | ret = tcpm_pd_send_request(port); |
| 2428 | if (ret < 0) { |
| 2429 | /* Let the Source send capabilities again. */ |
| 2430 | tcpm_set_state(port, SNK_WAIT_CAPABILITIES, 0); |
| 2431 | } else { |
| 2432 | tcpm_set_state_cond(port, hard_reset_state(port), |
| 2433 | PD_T_SENDER_RESPONSE); |
| 2434 | } |
| 2435 | break; |
| 2436 | case SNK_TRANSITION_SINK: |
| 2437 | case SNK_TRANSITION_SINK_VBUS: |
| 2438 | tcpm_set_state(port, hard_reset_state(port), |
| 2439 | PD_T_PS_TRANSITION); |
| 2440 | break; |
| 2441 | case SNK_READY: |
| 2442 | port->try_snk_count = 0; |
| 2443 | port->explicit_contract = true; |
| 2444 | typec_set_pwr_opmode(port->typec_port, TYPEC_PWR_MODE_PD); |
| 2445 | port->pwr_opmode = TYPEC_PWR_MODE_PD; |
| 2446 | |
| 2447 | tcpm_swap_complete(port, 0); |
| 2448 | tcpm_typec_connect(port); |
| 2449 | tcpm_check_send_discover(port); |
| 2450 | break; |
| 2451 | |
| 2452 | /* Accessory states */ |
| 2453 | case ACC_UNATTACHED: |
| 2454 | tcpm_acc_detach(port); |
| 2455 | tcpm_set_state(port, SRC_UNATTACHED, 0); |
| 2456 | break; |
| 2457 | case DEBUG_ACC_ATTACHED: |
| 2458 | case AUDIO_ACC_ATTACHED: |
| 2459 | ret = tcpm_acc_attach(port); |
| 2460 | if (ret < 0) |
| 2461 | tcpm_set_state(port, ACC_UNATTACHED, 0); |
| 2462 | break; |
| 2463 | case AUDIO_ACC_DEBOUNCE: |
| 2464 | tcpm_set_state(port, ACC_UNATTACHED, PD_T_CC_DEBOUNCE); |
| 2465 | break; |
| 2466 | |
| 2467 | /* Hard_Reset states */ |
| 2468 | case HARD_RESET_SEND: |
| 2469 | tcpm_pd_transmit(port, TCPC_TX_HARD_RESET, NULL); |
| 2470 | tcpm_set_state(port, HARD_RESET_START, 0); |
| 2471 | break; |
| 2472 | case HARD_RESET_START: |
| 2473 | port->hard_reset_count++; |
| 2474 | port->tcpc->set_pd_rx(port->tcpc, false); |
| 2475 | tcpm_unregister_altmodes(port); |
| 2476 | port->send_discover = true; |
| 2477 | if (port->pwr_role == TYPEC_SOURCE) |
| 2478 | tcpm_set_state(port, SRC_HARD_RESET_VBUS_OFF, |
| 2479 | PD_T_PS_HARD_RESET); |
| 2480 | else |
| 2481 | tcpm_set_state(port, SNK_HARD_RESET_SINK_OFF, 0); |
| 2482 | break; |
| 2483 | case SRC_HARD_RESET_VBUS_OFF: |
| 2484 | tcpm_set_vconn(port, true); |
| 2485 | tcpm_set_vbus(port, false); |
| 2486 | tcpm_set_roles(port, false, TYPEC_SOURCE, TYPEC_HOST); |
| 2487 | tcpm_set_state(port, SRC_HARD_RESET_VBUS_ON, PD_T_SRC_RECOVER); |
| 2488 | break; |
| 2489 | case SRC_HARD_RESET_VBUS_ON: |
| 2490 | tcpm_set_vbus(port, true); |
| 2491 | port->tcpc->set_pd_rx(port->tcpc, true); |
| 2492 | tcpm_set_attached_state(port, true); |
| 2493 | tcpm_set_state(port, SRC_UNATTACHED, PD_T_PS_SOURCE_ON); |
| 2494 | break; |
| 2495 | case SNK_HARD_RESET_SINK_OFF: |
| 2496 | tcpm_set_vconn(port, false); |
| 2497 | tcpm_set_charge(port, false); |
| 2498 | tcpm_set_roles(port, false, TYPEC_SINK, TYPEC_DEVICE); |
| 2499 | /* |
| 2500 | * VBUS may or may not toggle, depending on the adapter. |
| 2501 | * If it doesn't toggle, transition to SNK_HARD_RESET_SINK_ON |
| 2502 | * directly after timeout. |
| 2503 | */ |
| 2504 | tcpm_set_state(port, SNK_HARD_RESET_SINK_ON, PD_T_SAFE_0V); |
| 2505 | break; |
| 2506 | case SNK_HARD_RESET_WAIT_VBUS: |
| 2507 | /* Assume we're disconnected if VBUS doesn't come back. */ |
| 2508 | tcpm_set_state(port, SNK_UNATTACHED, |
| 2509 | PD_T_SRC_RECOVER_MAX + PD_T_SRC_TURN_ON); |
| 2510 | break; |
| 2511 | case SNK_HARD_RESET_SINK_ON: |
| 2512 | /* Note: There is no guarantee that VBUS is on in this state */ |
| 2513 | /* |
| 2514 | * XXX: |
| 2515 | * The specification suggests that dual mode ports in sink |
| 2516 | * mode should transition to state PE_SRC_Transition_to_default. |
| 2517 | * See USB power delivery specification chapter 8.3.3.6.1.3. |
| 2518 | * This would mean to to |
| 2519 | * - turn off VCONN, reset power supply |
| 2520 | * - request hardware reset |
| 2521 | * - turn on VCONN |
| 2522 | * - Transition to state PE_Src_Startup |
| 2523 | * SNK only ports shall transition to state Snk_Startup |
| 2524 | * (see chapter 8.3.3.3.8). |
| 2525 | * Similar, dual-mode ports in source mode should transition |
| 2526 | * to PE_SNK_Transition_to_default. |
| 2527 | */ |
| 2528 | tcpm_set_attached_state(port, true); |
| 2529 | tcpm_set_state(port, SNK_STARTUP, 0); |
| 2530 | break; |
| 2531 | |
| 2532 | /* Soft_Reset states */ |
| 2533 | case SOFT_RESET: |
| 2534 | port->message_id = 0; |
| 2535 | port->rx_msgid = -1; |
| 2536 | tcpm_pd_send_control(port, PD_CTRL_ACCEPT); |
| 2537 | if (port->pwr_role == TYPEC_SOURCE) |
| 2538 | tcpm_set_state(port, SRC_SEND_CAPABILITIES, 0); |
| 2539 | else |
| 2540 | tcpm_set_state(port, SNK_WAIT_CAPABILITIES, 0); |
| 2541 | break; |
| 2542 | case SOFT_RESET_SEND: |
| 2543 | port->message_id = 0; |
| 2544 | port->rx_msgid = -1; |
| 2545 | if (tcpm_pd_send_control(port, PD_CTRL_SOFT_RESET)) |
| 2546 | tcpm_set_state_cond(port, hard_reset_state(port), 0); |
| 2547 | else |
| 2548 | tcpm_set_state_cond(port, hard_reset_state(port), |
| 2549 | PD_T_SENDER_RESPONSE); |
| 2550 | break; |
| 2551 | |
| 2552 | /* DR_Swap states */ |
| 2553 | case DR_SWAP_SEND: |
| 2554 | tcpm_pd_send_control(port, PD_CTRL_DR_SWAP); |
| 2555 | tcpm_set_state_cond(port, DR_SWAP_SEND_TIMEOUT, |
| 2556 | PD_T_SENDER_RESPONSE); |
| 2557 | break; |
| 2558 | case DR_SWAP_ACCEPT: |
| 2559 | tcpm_pd_send_control(port, PD_CTRL_ACCEPT); |
| 2560 | tcpm_set_state_cond(port, DR_SWAP_CHANGE_DR, 0); |
| 2561 | break; |
| 2562 | case DR_SWAP_SEND_TIMEOUT: |
| 2563 | tcpm_swap_complete(port, -ETIMEDOUT); |
| 2564 | tcpm_set_state(port, ready_state(port), 0); |
| 2565 | break; |
| 2566 | case DR_SWAP_CHANGE_DR: |
| 2567 | if (port->data_role == TYPEC_HOST) { |
| 2568 | tcpm_unregister_altmodes(port); |
| 2569 | tcpm_set_roles(port, true, port->pwr_role, |
| 2570 | TYPEC_DEVICE); |
| 2571 | } else { |
| 2572 | tcpm_set_roles(port, true, port->pwr_role, |
| 2573 | TYPEC_HOST); |
| 2574 | port->send_discover = true; |
| 2575 | } |
| 2576 | tcpm_set_state(port, ready_state(port), 0); |
| 2577 | break; |
| 2578 | |
| 2579 | /* PR_Swap states */ |
| 2580 | case PR_SWAP_ACCEPT: |
| 2581 | tcpm_pd_send_control(port, PD_CTRL_ACCEPT); |
| 2582 | tcpm_set_state(port, PR_SWAP_START, 0); |
| 2583 | break; |
| 2584 | case PR_SWAP_SEND: |
| 2585 | tcpm_pd_send_control(port, PD_CTRL_PR_SWAP); |
| 2586 | tcpm_set_state_cond(port, PR_SWAP_SEND_TIMEOUT, |
| 2587 | PD_T_SENDER_RESPONSE); |
| 2588 | break; |
| 2589 | case PR_SWAP_SEND_TIMEOUT: |
| 2590 | tcpm_swap_complete(port, -ETIMEDOUT); |
| 2591 | tcpm_set_state(port, ready_state(port), 0); |
| 2592 | break; |
| 2593 | case PR_SWAP_START: |
| 2594 | if (port->pwr_role == TYPEC_SOURCE) |
| 2595 | tcpm_set_state(port, PR_SWAP_SRC_SNK_TRANSITION_OFF, |
| 2596 | PD_T_SRC_TRANSITION); |
| 2597 | else |
| 2598 | tcpm_set_state(port, PR_SWAP_SNK_SRC_SINK_OFF, 0); |
| 2599 | break; |
| 2600 | case PR_SWAP_SRC_SNK_TRANSITION_OFF: |
| 2601 | tcpm_set_vbus(port, false); |
| 2602 | port->explicit_contract = false; |
| 2603 | tcpm_set_state(port, PR_SWAP_SRC_SNK_SOURCE_OFF, |
| 2604 | PD_T_PS_SOURCE_OFF); |
| 2605 | break; |
| 2606 | case PR_SWAP_SRC_SNK_SOURCE_OFF: |
| 2607 | tcpm_set_cc(port, TYPEC_CC_RD); |
| 2608 | /* |
| 2609 | * USB-PD standard, 6.2.1.4, Port Power Role: |
| 2610 | * "During the Power Role Swap Sequence, for the initial Source |
| 2611 | * Port, the Port Power Role field shall be set to Sink in the |
| 2612 | * PS_RDY Message indicating that the initial Source’s power |
| 2613 | * supply is turned off" |
| 2614 | */ |
| 2615 | tcpm_set_pwr_role(port, TYPEC_SINK); |
| 2616 | if (tcpm_pd_send_control(port, PD_CTRL_PS_RDY)) { |
| 2617 | tcpm_set_state(port, ERROR_RECOVERY, 0); |
| 2618 | break; |
| 2619 | } |
| 2620 | tcpm_set_state_cond(port, SNK_UNATTACHED, PD_T_PS_SOURCE_ON); |
| 2621 | break; |
| 2622 | case PR_SWAP_SRC_SNK_SINK_ON: |
| 2623 | tcpm_set_state(port, SNK_STARTUP, 0); |
| 2624 | break; |
| 2625 | case PR_SWAP_SNK_SRC_SINK_OFF: |
| 2626 | tcpm_set_charge(port, false); |
| 2627 | tcpm_set_state(port, hard_reset_state(port), |
| 2628 | PD_T_PS_SOURCE_OFF); |
| 2629 | break; |
| 2630 | case PR_SWAP_SNK_SRC_SOURCE_ON: |
| 2631 | tcpm_set_cc(port, tcpm_rp_cc(port)); |
| 2632 | tcpm_set_vbus(port, true); |
| 2633 | /* |
| 2634 | * USB PD standard, 6.2.1.4: |
| 2635 | * "Subsequent Messages initiated by the Policy Engine, |
| 2636 | * such as the PS_RDY Message sent to indicate that Vbus |
| 2637 | * is ready, will have the Port Power Role field set to |
| 2638 | * Source." |
| 2639 | */ |
| 2640 | tcpm_set_pwr_role(port, TYPEC_SOURCE); |
| 2641 | tcpm_pd_send_control(port, PD_CTRL_PS_RDY); |
| 2642 | tcpm_set_state(port, SRC_STARTUP, 0); |
| 2643 | break; |
| 2644 | |
| 2645 | case VCONN_SWAP_ACCEPT: |
| 2646 | tcpm_pd_send_control(port, PD_CTRL_ACCEPT); |
| 2647 | tcpm_set_state(port, VCONN_SWAP_START, 0); |
| 2648 | break; |
| 2649 | case VCONN_SWAP_SEND: |
| 2650 | tcpm_pd_send_control(port, PD_CTRL_VCONN_SWAP); |
| 2651 | tcpm_set_state(port, VCONN_SWAP_SEND_TIMEOUT, |
| 2652 | PD_T_SENDER_RESPONSE); |
| 2653 | break; |
| 2654 | case VCONN_SWAP_SEND_TIMEOUT: |
| 2655 | tcpm_swap_complete(port, -ETIMEDOUT); |
| 2656 | tcpm_set_state(port, ready_state(port), 0); |
| 2657 | break; |
| 2658 | case VCONN_SWAP_START: |
| 2659 | if (port->vconn_role == TYPEC_SOURCE) |
| 2660 | tcpm_set_state(port, VCONN_SWAP_WAIT_FOR_VCONN, 0); |
| 2661 | else |
| 2662 | tcpm_set_state(port, VCONN_SWAP_TURN_ON_VCONN, 0); |
| 2663 | break; |
| 2664 | case VCONN_SWAP_WAIT_FOR_VCONN: |
| 2665 | tcpm_set_state(port, hard_reset_state(port), |
| 2666 | PD_T_VCONN_SOURCE_ON); |
| 2667 | break; |
| 2668 | case VCONN_SWAP_TURN_ON_VCONN: |
| 2669 | tcpm_set_vconn(port, true); |
| 2670 | tcpm_pd_send_control(port, PD_CTRL_PS_RDY); |
| 2671 | tcpm_set_state(port, ready_state(port), 0); |
| 2672 | break; |
| 2673 | case VCONN_SWAP_TURN_OFF_VCONN: |
| 2674 | tcpm_set_vconn(port, false); |
| 2675 | tcpm_set_state(port, ready_state(port), 0); |
| 2676 | break; |
| 2677 | |
| 2678 | case DR_SWAP_CANCEL: |
| 2679 | case PR_SWAP_CANCEL: |
| 2680 | case VCONN_SWAP_CANCEL: |
| 2681 | tcpm_swap_complete(port, port->swap_status); |
| 2682 | if (port->pwr_role == TYPEC_SOURCE) |
| 2683 | tcpm_set_state(port, SRC_READY, 0); |
| 2684 | else |
| 2685 | tcpm_set_state(port, SNK_READY, 0); |
| 2686 | break; |
| 2687 | |
| 2688 | case BIST_RX: |
| 2689 | switch (BDO_MODE_MASK(port->bist_request)) { |
| 2690 | case BDO_MODE_CARRIER2: |
| 2691 | tcpm_pd_transmit(port, TCPC_TX_BIST_MODE_2, NULL); |
| 2692 | break; |
| 2693 | default: |
| 2694 | break; |
| 2695 | } |
| 2696 | /* Always switch to unattached state */ |
| 2697 | tcpm_set_state(port, unattached_state(port), 0); |
| 2698 | break; |
| 2699 | case ERROR_RECOVERY: |
| 2700 | tcpm_swap_complete(port, -EPROTO); |
| 2701 | tcpm_reset_port(port); |
| 2702 | |
| 2703 | tcpm_set_cc(port, TYPEC_CC_OPEN); |
| 2704 | tcpm_set_state(port, ERROR_RECOVERY_WAIT_OFF, |
| 2705 | PD_T_ERROR_RECOVERY); |
| 2706 | break; |
| 2707 | case ERROR_RECOVERY_WAIT_OFF: |
| 2708 | tcpm_set_state(port, |
| 2709 | tcpm_default_state(port), |
| 2710 | port->vbus_present ? PD_T_PS_SOURCE_OFF : 0); |
| 2711 | break; |
| 2712 | default: |
| 2713 | WARN(1, "Unexpected port state %d\n", port->state); |
| 2714 | break; |
| 2715 | } |
| 2716 | } |
| 2717 | |
| 2718 | static void tcpm_state_machine_work(struct work_struct *work) |
| 2719 | { |
| 2720 | struct tcpm_port *port = container_of(work, struct tcpm_port, |
| 2721 | state_machine.work); |
| 2722 | enum tcpm_state prev_state; |
| 2723 | |
| 2724 | mutex_lock(&port->lock); |
| 2725 | port->state_machine_running = true; |
| 2726 | |
| 2727 | if (port->queued_message && tcpm_send_queued_message(port)) |
| 2728 | goto done; |
| 2729 | |
| 2730 | /* If we were queued due to a delayed state change, update it now */ |
| 2731 | if (port->delayed_state) { |
| 2732 | tcpm_log(port, "state change %s -> %s [delayed %ld ms]", |
| 2733 | tcpm_states[port->state], |
| 2734 | tcpm_states[port->delayed_state], port->delay_ms); |
| 2735 | port->prev_state = port->state; |
| 2736 | port->state = port->delayed_state; |
| 2737 | port->delayed_state = INVALID_STATE; |
| 2738 | } |
| 2739 | |
| 2740 | /* |
| 2741 | * Continue running as long as we have (non-delayed) state changes |
| 2742 | * to make. |
| 2743 | */ |
| 2744 | do { |
| 2745 | prev_state = port->state; |
| 2746 | run_state_machine(port); |
| 2747 | if (port->queued_message) |
| 2748 | tcpm_send_queued_message(port); |
| 2749 | } while (port->state != prev_state && !port->delayed_state); |
| 2750 | |
| 2751 | done: |
| 2752 | port->state_machine_running = false; |
| 2753 | mutex_unlock(&port->lock); |
| 2754 | } |
| 2755 | |
| 2756 | static void _tcpm_cc_change(struct tcpm_port *port, enum typec_cc_status cc1, |
| 2757 | enum typec_cc_status cc2) |
| 2758 | { |
| 2759 | enum typec_cc_status old_cc1, old_cc2; |
| 2760 | enum tcpm_state new_state; |
| 2761 | |
| 2762 | old_cc1 = port->cc1; |
| 2763 | old_cc2 = port->cc2; |
| 2764 | port->cc1 = cc1; |
| 2765 | port->cc2 = cc2; |
| 2766 | |
| 2767 | tcpm_log_force(port, |
| 2768 | "CC1: %u -> %u, CC2: %u -> %u [state %s, polarity %d, %s]", |
| 2769 | old_cc1, cc1, old_cc2, cc2, tcpm_states[port->state], |
| 2770 | port->polarity, |
| 2771 | tcpm_port_is_disconnected(port) ? "disconnected" |
| 2772 | : "connected"); |
| 2773 | |
| 2774 | switch (port->state) { |
| 2775 | case DRP_TOGGLING: |
| 2776 | if (tcpm_port_is_debug(port) || tcpm_port_is_audio(port) || |
| 2777 | tcpm_port_is_source(port)) |
| 2778 | tcpm_set_state(port, SRC_ATTACH_WAIT, 0); |
| 2779 | else if (tcpm_port_is_sink(port)) |
| 2780 | tcpm_set_state(port, SNK_ATTACH_WAIT, 0); |
| 2781 | break; |
| 2782 | case SRC_UNATTACHED: |
| 2783 | case ACC_UNATTACHED: |
| 2784 | if (tcpm_port_is_debug(port) || tcpm_port_is_audio(port) || |
| 2785 | tcpm_port_is_source(port)) |
| 2786 | tcpm_set_state(port, SRC_ATTACH_WAIT, 0); |
| 2787 | break; |
| 2788 | case SRC_ATTACH_WAIT: |
| 2789 | if (tcpm_port_is_disconnected(port) || |
| 2790 | tcpm_port_is_audio_detached(port)) |
| 2791 | tcpm_set_state(port, SRC_UNATTACHED, 0); |
| 2792 | else if (cc1 != old_cc1 || cc2 != old_cc2) |
| 2793 | tcpm_set_state(port, SRC_ATTACH_WAIT, 0); |
| 2794 | break; |
| 2795 | case SRC_ATTACHED: |
| 2796 | if (tcpm_port_is_disconnected(port)) |
| 2797 | tcpm_set_state(port, SRC_UNATTACHED, 0); |
| 2798 | break; |
| 2799 | |
| 2800 | case SNK_UNATTACHED: |
| 2801 | if (tcpm_port_is_sink(port)) |
| 2802 | tcpm_set_state(port, SNK_ATTACH_WAIT, 0); |
| 2803 | break; |
| 2804 | case SNK_ATTACH_WAIT: |
| 2805 | if ((port->cc1 == TYPEC_CC_OPEN && |
| 2806 | port->cc2 != TYPEC_CC_OPEN) || |
| 2807 | (port->cc1 != TYPEC_CC_OPEN && |
| 2808 | port->cc2 == TYPEC_CC_OPEN)) |
| 2809 | new_state = SNK_DEBOUNCED; |
| 2810 | else if (tcpm_port_is_disconnected(port)) |
| 2811 | new_state = SNK_UNATTACHED; |
| 2812 | else |
| 2813 | break; |
| 2814 | if (new_state != port->delayed_state) |
| 2815 | tcpm_set_state(port, SNK_ATTACH_WAIT, 0); |
| 2816 | break; |
| 2817 | case SNK_DEBOUNCED: |
| 2818 | if (tcpm_port_is_disconnected(port)) |
| 2819 | new_state = SNK_UNATTACHED; |
| 2820 | else if (port->vbus_present) |
| 2821 | new_state = tcpm_try_src(port) ? SRC_TRY : SNK_ATTACHED; |
| 2822 | else |
| 2823 | new_state = SNK_UNATTACHED; |
| 2824 | if (new_state != port->delayed_state) |
| 2825 | tcpm_set_state(port, SNK_DEBOUNCED, 0); |
| 2826 | break; |
| 2827 | case SNK_READY: |
| 2828 | if (tcpm_port_is_disconnected(port)) |
| 2829 | tcpm_set_state(port, unattached_state(port), 0); |
| 2830 | else if (!port->pd_capable && |
| 2831 | (cc1 != old_cc1 || cc2 != old_cc2)) |
| 2832 | tcpm_set_current_limit(port, |
| 2833 | tcpm_get_current_limit(port), |
| 2834 | 5000); |
| 2835 | break; |
| 2836 | |
| 2837 | case AUDIO_ACC_ATTACHED: |
| 2838 | if (cc1 == TYPEC_CC_OPEN || cc2 == TYPEC_CC_OPEN) |
| 2839 | tcpm_set_state(port, AUDIO_ACC_DEBOUNCE, 0); |
| 2840 | break; |
| 2841 | case AUDIO_ACC_DEBOUNCE: |
| 2842 | if (tcpm_port_is_audio(port)) |
| 2843 | tcpm_set_state(port, AUDIO_ACC_ATTACHED, 0); |
| 2844 | break; |
| 2845 | |
| 2846 | case DEBUG_ACC_ATTACHED: |
| 2847 | if (cc1 == TYPEC_CC_OPEN || cc2 == TYPEC_CC_OPEN) |
| 2848 | tcpm_set_state(port, ACC_UNATTACHED, 0); |
| 2849 | break; |
| 2850 | |
| 2851 | case SNK_TRY: |
| 2852 | /* Do nothing, waiting for timeout */ |
| 2853 | break; |
| 2854 | |
| 2855 | case SNK_DISCOVERY: |
| 2856 | /* CC line is unstable, wait for debounce */ |
| 2857 | if (tcpm_port_is_disconnected(port)) |
| 2858 | tcpm_set_state(port, SNK_DISCOVERY_DEBOUNCE, 0); |
| 2859 | break; |
| 2860 | case SNK_DISCOVERY_DEBOUNCE: |
| 2861 | break; |
| 2862 | |
| 2863 | case SRC_TRYWAIT: |
| 2864 | /* Hand over to state machine if needed */ |
| 2865 | if (!port->vbus_present && tcpm_port_is_source(port)) |
| 2866 | new_state = SRC_ATTACHED; |
| 2867 | else |
| 2868 | new_state = SRC_TRYWAIT_UNATTACHED; |
| 2869 | |
| 2870 | if (new_state != port->delayed_state) |
| 2871 | tcpm_set_state(port, SRC_TRYWAIT, 0); |
| 2872 | break; |
| 2873 | case SNK_TRY_WAIT: |
| 2874 | if (port->vbus_present && tcpm_port_is_sink(port)) { |
| 2875 | tcpm_set_state(port, SNK_ATTACHED, 0); |
| 2876 | break; |
| 2877 | } |
| 2878 | if (!tcpm_port_is_sink(port)) |
| 2879 | new_state = SRC_TRYWAIT; |
| 2880 | else |
| 2881 | new_state = SRC_TRYWAIT_UNATTACHED; |
| 2882 | |
| 2883 | if (new_state != port->delayed_state) |
| 2884 | tcpm_set_state(port, SNK_TRY_WAIT, 0); |
| 2885 | break; |
| 2886 | |
| 2887 | case SRC_TRY: |
| 2888 | tcpm_set_state(port, SRC_TRY_DEBOUNCE, 0); |
| 2889 | break; |
| 2890 | case SRC_TRY_DEBOUNCE: |
| 2891 | tcpm_set_state(port, SRC_TRY, 0); |
| 2892 | break; |
| 2893 | case SNK_TRYWAIT_DEBOUNCE: |
| 2894 | if (port->vbus_present) { |
| 2895 | tcpm_set_state(port, SNK_ATTACHED, 0); |
| 2896 | break; |
| 2897 | } |
| 2898 | if (tcpm_port_is_source(port)) { |
| 2899 | tcpm_set_state(port, SRC_ATTACHED, 0); |
| 2900 | break; |
| 2901 | } |
| 2902 | if (tcpm_port_is_disconnected(port) && |
| 2903 | port->delayed_state != SNK_UNATTACHED) |
| 2904 | tcpm_set_state(port, SNK_TRYWAIT_DEBOUNCE, 0); |
| 2905 | break; |
| 2906 | |
| 2907 | case PR_SWAP_SNK_SRC_SINK_OFF: |
| 2908 | case PR_SWAP_SRC_SNK_TRANSITION_OFF: |
| 2909 | case PR_SWAP_SRC_SNK_SOURCE_OFF: |
| 2910 | /* |
| 2911 | * CC state change is expected here; we just turned off power. |
| 2912 | * Ignore it. |
| 2913 | */ |
| 2914 | break; |
| 2915 | |
| 2916 | default: |
| 2917 | if (tcpm_port_is_disconnected(port)) |
| 2918 | tcpm_set_state(port, unattached_state(port), 0); |
| 2919 | break; |
| 2920 | } |
| 2921 | } |
| 2922 | |
| 2923 | static void _tcpm_pd_vbus_on(struct tcpm_port *port) |
| 2924 | { |
| 2925 | enum tcpm_state new_state; |
| 2926 | |
| 2927 | tcpm_log_force(port, "VBUS on"); |
| 2928 | port->vbus_present = true; |
| 2929 | switch (port->state) { |
| 2930 | case SNK_TRANSITION_SINK_VBUS: |
| 2931 | tcpm_set_state(port, SNK_READY, 0); |
| 2932 | break; |
| 2933 | case SNK_DISCOVERY: |
| 2934 | tcpm_set_state(port, SNK_DISCOVERY, 0); |
| 2935 | break; |
| 2936 | |
| 2937 | case SNK_DEBOUNCED: |
| 2938 | tcpm_set_state(port, tcpm_try_src(port) ? SRC_TRY |
| 2939 | : SNK_ATTACHED, |
| 2940 | 0); |
| 2941 | break; |
| 2942 | case SNK_HARD_RESET_WAIT_VBUS: |
| 2943 | tcpm_set_state(port, SNK_HARD_RESET_SINK_ON, 0); |
| 2944 | break; |
| 2945 | case SRC_ATTACHED: |
| 2946 | tcpm_set_state(port, SRC_STARTUP, 0); |
| 2947 | break; |
| 2948 | case SRC_HARD_RESET_VBUS_ON: |
| 2949 | tcpm_set_state(port, SRC_STARTUP, 0); |
| 2950 | break; |
| 2951 | |
| 2952 | case SNK_TRY: |
| 2953 | /* Do nothing, waiting for timeout */ |
| 2954 | break; |
| 2955 | case SRC_TRYWAIT: |
| 2956 | /* Hand over to state machine if needed */ |
| 2957 | if (port->delayed_state != SRC_TRYWAIT_UNATTACHED) |
| 2958 | tcpm_set_state(port, SRC_TRYWAIT, 0); |
| 2959 | break; |
| 2960 | case SNK_TRY_WAIT: |
| 2961 | if (tcpm_port_is_sink(port)) { |
| 2962 | tcpm_set_state(port, SNK_ATTACHED, 0); |
| 2963 | break; |
| 2964 | } |
| 2965 | if (!tcpm_port_is_sink(port)) |
| 2966 | new_state = SRC_TRYWAIT; |
| 2967 | else |
| 2968 | new_state = SRC_TRYWAIT_UNATTACHED; |
| 2969 | |
| 2970 | if (new_state != port->delayed_state) |
| 2971 | tcpm_set_state(port, SNK_TRY_WAIT, 0); |
| 2972 | break; |
| 2973 | case SNK_TRYWAIT: |
| 2974 | tcpm_set_state(port, SNK_TRYWAIT_VBUS, 0); |
| 2975 | break; |
| 2976 | |
| 2977 | default: |
| 2978 | break; |
| 2979 | } |
| 2980 | } |
| 2981 | |
| 2982 | static void _tcpm_pd_vbus_off(struct tcpm_port *port) |
| 2983 | { |
| 2984 | enum tcpm_state new_state; |
| 2985 | |
| 2986 | tcpm_log_force(port, "VBUS off"); |
| 2987 | port->vbus_present = false; |
| 2988 | port->vbus_never_low = false; |
| 2989 | switch (port->state) { |
| 2990 | case SNK_HARD_RESET_SINK_OFF: |
| 2991 | tcpm_set_state(port, SNK_HARD_RESET_WAIT_VBUS, 0); |
| 2992 | break; |
| 2993 | case SRC_HARD_RESET_VBUS_OFF: |
| 2994 | tcpm_set_state(port, SRC_HARD_RESET_VBUS_ON, 0); |
| 2995 | break; |
| 2996 | case HARD_RESET_SEND: |
| 2997 | break; |
| 2998 | |
| 2999 | case SNK_TRY: |
| 3000 | /* Do nothing, waiting for timeout */ |
| 3001 | break; |
| 3002 | case SRC_TRYWAIT: |
| 3003 | /* Hand over to state machine if needed */ |
| 3004 | if (tcpm_port_is_source(port)) |
| 3005 | new_state = SRC_ATTACHED; |
| 3006 | else |
| 3007 | new_state = SRC_TRYWAIT_UNATTACHED; |
| 3008 | if (new_state != port->delayed_state) |
| 3009 | tcpm_set_state(port, SRC_TRYWAIT, 0); |
| 3010 | break; |
| 3011 | case SNK_TRY_WAIT: |
| 3012 | if (!tcpm_port_is_sink(port)) |
| 3013 | new_state = SRC_TRYWAIT; |
| 3014 | else |
| 3015 | new_state = SRC_TRYWAIT_UNATTACHED; |
| 3016 | |
| 3017 | if (new_state != port->delayed_state) |
| 3018 | tcpm_set_state(port, SNK_TRY_WAIT, 0); |
| 3019 | break; |
| 3020 | case SNK_TRYWAIT_VBUS: |
| 3021 | tcpm_set_state(port, SNK_TRYWAIT, 0); |
| 3022 | break; |
| 3023 | |
| 3024 | case SNK_ATTACH_WAIT: |
| 3025 | tcpm_set_state(port, SNK_UNATTACHED, 0); |
| 3026 | break; |
| 3027 | |
| 3028 | case SNK_NEGOTIATE_CAPABILITIES: |
| 3029 | break; |
| 3030 | |
| 3031 | case PR_SWAP_SRC_SNK_TRANSITION_OFF: |
| 3032 | tcpm_set_state(port, PR_SWAP_SRC_SNK_SOURCE_OFF, 0); |
| 3033 | break; |
| 3034 | |
| 3035 | case PR_SWAP_SNK_SRC_SINK_OFF: |
| 3036 | /* Do nothing, expected */ |
| 3037 | break; |
| 3038 | |
| 3039 | case ERROR_RECOVERY_WAIT_OFF: |
| 3040 | tcpm_set_state(port, |
| 3041 | port->pwr_role == TYPEC_SOURCE ? |
| 3042 | SRC_UNATTACHED : SNK_UNATTACHED, |
| 3043 | 0); |
| 3044 | break; |
| 3045 | |
| 3046 | default: |
| 3047 | if (port->pwr_role == TYPEC_SINK && |
| 3048 | port->attached) |
| 3049 | tcpm_set_state(port, SNK_UNATTACHED, 0); |
| 3050 | break; |
| 3051 | } |
| 3052 | } |
| 3053 | |
| 3054 | static void _tcpm_pd_hard_reset(struct tcpm_port *port) |
| 3055 | { |
| 3056 | tcpm_log_force(port, "Received hard reset"); |
| 3057 | /* |
| 3058 | * If we keep receiving hard reset requests, executing the hard reset |
| 3059 | * must have failed. Revert to error recovery if that happens. |
| 3060 | */ |
| 3061 | tcpm_set_state(port, |
| 3062 | port->hard_reset_count < PD_N_HARD_RESET_COUNT ? |
| 3063 | HARD_RESET_START : ERROR_RECOVERY, |
| 3064 | 0); |
| 3065 | } |
| 3066 | |
| 3067 | static void tcpm_pd_event_handler(struct work_struct *work) |
| 3068 | { |
| 3069 | struct tcpm_port *port = container_of(work, struct tcpm_port, |
| 3070 | event_work); |
| 3071 | u32 events; |
| 3072 | |
| 3073 | mutex_lock(&port->lock); |
| 3074 | |
| 3075 | spin_lock(&port->pd_event_lock); |
| 3076 | while (port->pd_events) { |
| 3077 | events = port->pd_events; |
| 3078 | port->pd_events = 0; |
| 3079 | spin_unlock(&port->pd_event_lock); |
| 3080 | if (events & TCPM_RESET_EVENT) |
| 3081 | _tcpm_pd_hard_reset(port); |
| 3082 | if (events & TCPM_VBUS_EVENT) { |
| 3083 | bool vbus; |
| 3084 | |
| 3085 | vbus = port->tcpc->get_vbus(port->tcpc); |
| 3086 | if (vbus) |
| 3087 | _tcpm_pd_vbus_on(port); |
| 3088 | else |
| 3089 | _tcpm_pd_vbus_off(port); |
| 3090 | } |
| 3091 | if (events & TCPM_CC_EVENT) { |
| 3092 | enum typec_cc_status cc1, cc2; |
| 3093 | |
| 3094 | if (port->tcpc->get_cc(port->tcpc, &cc1, &cc2) == 0) |
| 3095 | _tcpm_cc_change(port, cc1, cc2); |
| 3096 | } |
| 3097 | spin_lock(&port->pd_event_lock); |
| 3098 | } |
| 3099 | spin_unlock(&port->pd_event_lock); |
| 3100 | mutex_unlock(&port->lock); |
| 3101 | } |
| 3102 | |
| 3103 | void tcpm_cc_change(struct tcpm_port *port) |
| 3104 | { |
| 3105 | spin_lock(&port->pd_event_lock); |
| 3106 | port->pd_events |= TCPM_CC_EVENT; |
| 3107 | spin_unlock(&port->pd_event_lock); |
| 3108 | queue_work(port->wq, &port->event_work); |
| 3109 | } |
| 3110 | EXPORT_SYMBOL_GPL(tcpm_cc_change); |
| 3111 | |
| 3112 | void tcpm_vbus_change(struct tcpm_port *port) |
| 3113 | { |
| 3114 | spin_lock(&port->pd_event_lock); |
| 3115 | port->pd_events |= TCPM_VBUS_EVENT; |
| 3116 | spin_unlock(&port->pd_event_lock); |
| 3117 | queue_work(port->wq, &port->event_work); |
| 3118 | } |
| 3119 | EXPORT_SYMBOL_GPL(tcpm_vbus_change); |
| 3120 | |
| 3121 | void tcpm_pd_hard_reset(struct tcpm_port *port) |
| 3122 | { |
| 3123 | spin_lock(&port->pd_event_lock); |
| 3124 | port->pd_events = TCPM_RESET_EVENT; |
| 3125 | spin_unlock(&port->pd_event_lock); |
| 3126 | queue_work(port->wq, &port->event_work); |
| 3127 | } |
| 3128 | EXPORT_SYMBOL_GPL(tcpm_pd_hard_reset); |
| 3129 | |
| 3130 | static int tcpm_dr_set(const struct typec_capability *cap, |
| 3131 | enum typec_data_role data) |
| 3132 | { |
| 3133 | struct tcpm_port *port = typec_cap_to_tcpm(cap); |
| 3134 | int ret; |
| 3135 | |
| 3136 | mutex_lock(&port->swap_lock); |
| 3137 | mutex_lock(&port->lock); |
| 3138 | |
| 3139 | if (port->typec_caps.type != TYPEC_PORT_DRP || !port->pd_capable) { |
| 3140 | ret = -EINVAL; |
| 3141 | goto port_unlock; |
| 3142 | } |
| 3143 | if (port->state != SRC_READY && port->state != SNK_READY) { |
| 3144 | ret = -EAGAIN; |
| 3145 | goto port_unlock; |
| 3146 | } |
| 3147 | |
| 3148 | if (port->data_role == data) { |
| 3149 | ret = 0; |
| 3150 | goto port_unlock; |
| 3151 | } |
| 3152 | |
| 3153 | /* |
| 3154 | * XXX |
| 3155 | * 6.3.9: If an alternate mode is active, a request to swap |
| 3156 | * alternate modes shall trigger a port reset. |
| 3157 | * Reject data role swap request in this case. |
| 3158 | */ |
| 3159 | |
| 3160 | port->swap_status = 0; |
| 3161 | port->swap_pending = true; |
| 3162 | reinit_completion(&port->swap_complete); |
| 3163 | tcpm_set_state(port, DR_SWAP_SEND, 0); |
| 3164 | mutex_unlock(&port->lock); |
| 3165 | |
| 3166 | wait_for_completion(&port->swap_complete); |
| 3167 | |
| 3168 | ret = port->swap_status; |
| 3169 | goto swap_unlock; |
| 3170 | |
| 3171 | port_unlock: |
| 3172 | mutex_unlock(&port->lock); |
| 3173 | swap_unlock: |
| 3174 | mutex_unlock(&port->swap_lock); |
| 3175 | return ret; |
| 3176 | } |
| 3177 | |
| 3178 | static int tcpm_pr_set(const struct typec_capability *cap, |
| 3179 | enum typec_role role) |
| 3180 | { |
| 3181 | struct tcpm_port *port = typec_cap_to_tcpm(cap); |
| 3182 | int ret; |
| 3183 | |
| 3184 | mutex_lock(&port->swap_lock); |
| 3185 | mutex_lock(&port->lock); |
| 3186 | |
| 3187 | if (port->typec_caps.type != TYPEC_PORT_DRP) { |
| 3188 | ret = -EINVAL; |
| 3189 | goto port_unlock; |
| 3190 | } |
| 3191 | if (port->state != SRC_READY && port->state != SNK_READY) { |
| 3192 | ret = -EAGAIN; |
| 3193 | goto port_unlock; |
| 3194 | } |
| 3195 | |
| 3196 | if (role == port->pwr_role) { |
| 3197 | ret = 0; |
| 3198 | goto port_unlock; |
| 3199 | } |
| 3200 | |
| 3201 | if (!port->pd_capable) { |
| 3202 | /* |
| 3203 | * If the partner is not PD capable, reset the port to |
| 3204 | * trigger a role change. This can only work if a preferred |
| 3205 | * role is configured, and if it matches the requested role. |
| 3206 | */ |
| 3207 | if (port->try_role == TYPEC_NO_PREFERRED_ROLE || |
| 3208 | port->try_role == port->pwr_role) { |
| 3209 | ret = -EINVAL; |
| 3210 | goto port_unlock; |
| 3211 | } |
| 3212 | tcpm_set_state(port, HARD_RESET_SEND, 0); |
| 3213 | ret = 0; |
| 3214 | goto port_unlock; |
| 3215 | } |
| 3216 | |
| 3217 | port->swap_status = 0; |
| 3218 | port->swap_pending = true; |
| 3219 | reinit_completion(&port->swap_complete); |
| 3220 | tcpm_set_state(port, PR_SWAP_SEND, 0); |
| 3221 | mutex_unlock(&port->lock); |
| 3222 | |
| 3223 | wait_for_completion(&port->swap_complete); |
| 3224 | |
| 3225 | ret = port->swap_status; |
| 3226 | goto swap_unlock; |
| 3227 | |
| 3228 | port_unlock: |
| 3229 | mutex_unlock(&port->lock); |
| 3230 | swap_unlock: |
| 3231 | mutex_unlock(&port->swap_lock); |
| 3232 | return ret; |
| 3233 | } |
| 3234 | |
| 3235 | static int tcpm_vconn_set(const struct typec_capability *cap, |
| 3236 | enum typec_role role) |
| 3237 | { |
| 3238 | struct tcpm_port *port = typec_cap_to_tcpm(cap); |
| 3239 | int ret; |
| 3240 | |
| 3241 | mutex_lock(&port->swap_lock); |
| 3242 | mutex_lock(&port->lock); |
| 3243 | |
| 3244 | if (port->state != SRC_READY && port->state != SNK_READY) { |
| 3245 | ret = -EAGAIN; |
| 3246 | goto port_unlock; |
| 3247 | } |
| 3248 | |
| 3249 | if (role == port->vconn_role) { |
| 3250 | ret = 0; |
| 3251 | goto port_unlock; |
| 3252 | } |
| 3253 | |
| 3254 | port->swap_status = 0; |
| 3255 | port->swap_pending = true; |
| 3256 | reinit_completion(&port->swap_complete); |
| 3257 | tcpm_set_state(port, VCONN_SWAP_SEND, 0); |
| 3258 | mutex_unlock(&port->lock); |
| 3259 | |
| 3260 | wait_for_completion(&port->swap_complete); |
| 3261 | |
| 3262 | ret = port->swap_status; |
| 3263 | goto swap_unlock; |
| 3264 | |
| 3265 | port_unlock: |
| 3266 | mutex_unlock(&port->lock); |
| 3267 | swap_unlock: |
| 3268 | mutex_unlock(&port->swap_lock); |
| 3269 | return ret; |
| 3270 | } |
| 3271 | |
| 3272 | static int tcpm_try_role(const struct typec_capability *cap, int role) |
| 3273 | { |
| 3274 | struct tcpm_port *port = typec_cap_to_tcpm(cap); |
| 3275 | struct tcpc_dev *tcpc = port->tcpc; |
| 3276 | int ret = 0; |
| 3277 | |
| 3278 | mutex_lock(&port->lock); |
| 3279 | if (tcpc->try_role) |
| 3280 | ret = tcpc->try_role(tcpc, role); |
| 3281 | if (!ret && !tcpc->config->try_role_hw) |
| 3282 | port->try_role = role; |
| 3283 | port->try_src_count = 0; |
| 3284 | port->try_snk_count = 0; |
| 3285 | mutex_unlock(&port->lock); |
| 3286 | |
| 3287 | return ret; |
| 3288 | } |
| 3289 | |
| 3290 | static void tcpm_init(struct tcpm_port *port) |
| 3291 | { |
| 3292 | enum typec_cc_status cc1, cc2; |
| 3293 | |
| 3294 | port->tcpc->init(port->tcpc); |
| 3295 | |
| 3296 | tcpm_reset_port(port); |
| 3297 | |
| 3298 | /* |
| 3299 | * XXX |
| 3300 | * Should possibly wait for VBUS to settle if it was enabled locally |
| 3301 | * since tcpm_reset_port() will disable VBUS. |
| 3302 | */ |
| 3303 | port->vbus_present = port->tcpc->get_vbus(port->tcpc); |
| 3304 | if (port->vbus_present) |
| 3305 | port->vbus_never_low = true; |
| 3306 | |
| 3307 | tcpm_set_state(port, tcpm_default_state(port), 0); |
| 3308 | |
| 3309 | if (port->tcpc->get_cc(port->tcpc, &cc1, &cc2) == 0) |
| 3310 | _tcpm_cc_change(port, cc1, cc2); |
| 3311 | |
| 3312 | /* |
| 3313 | * Some adapters need a clean slate at startup, and won't recover |
| 3314 | * otherwise. So do not try to be fancy and force a clean disconnect. |
| 3315 | */ |
| 3316 | tcpm_set_state(port, ERROR_RECOVERY, 0); |
| 3317 | } |
| 3318 | |
| 3319 | void tcpm_tcpc_reset(struct tcpm_port *port) |
| 3320 | { |
| 3321 | mutex_lock(&port->lock); |
| 3322 | /* XXX: Maintain PD connection if possible? */ |
| 3323 | tcpm_init(port); |
| 3324 | mutex_unlock(&port->lock); |
| 3325 | } |
| 3326 | EXPORT_SYMBOL_GPL(tcpm_tcpc_reset); |
| 3327 | |
| 3328 | static int tcpm_copy_pdos(u32 *dest_pdo, const u32 *src_pdo, |
| 3329 | unsigned int nr_pdo) |
| 3330 | { |
| 3331 | unsigned int i; |
| 3332 | |
| 3333 | if (nr_pdo > PDO_MAX_OBJECTS) |
| 3334 | nr_pdo = PDO_MAX_OBJECTS; |
| 3335 | |
| 3336 | for (i = 0; i < nr_pdo; i++) |
| 3337 | dest_pdo[i] = src_pdo[i]; |
| 3338 | |
| 3339 | return nr_pdo; |
| 3340 | } |
| 3341 | |
| 3342 | static int tcpm_copy_vdos(u32 *dest_vdo, const u32 *src_vdo, |
| 3343 | unsigned int nr_vdo) |
| 3344 | { |
| 3345 | unsigned int i; |
| 3346 | |
| 3347 | if (nr_vdo > VDO_MAX_OBJECTS) |
| 3348 | nr_vdo = VDO_MAX_OBJECTS; |
| 3349 | |
| 3350 | for (i = 0; i < nr_vdo; i++) |
| 3351 | dest_vdo[i] = src_vdo[i]; |
| 3352 | |
| 3353 | return nr_vdo; |
| 3354 | } |
| 3355 | |
| 3356 | void tcpm_update_source_capabilities(struct tcpm_port *port, const u32 *pdo, |
| 3357 | unsigned int nr_pdo) |
| 3358 | { |
| 3359 | mutex_lock(&port->lock); |
| 3360 | port->nr_src_pdo = tcpm_copy_pdos(port->src_pdo, pdo, nr_pdo); |
| 3361 | switch (port->state) { |
| 3362 | case SRC_UNATTACHED: |
| 3363 | case SRC_ATTACH_WAIT: |
| 3364 | case SRC_TRYWAIT: |
| 3365 | tcpm_set_cc(port, tcpm_rp_cc(port)); |
| 3366 | break; |
| 3367 | case SRC_SEND_CAPABILITIES: |
| 3368 | case SRC_NEGOTIATE_CAPABILITIES: |
| 3369 | case SRC_READY: |
| 3370 | case SRC_WAIT_NEW_CAPABILITIES: |
| 3371 | tcpm_set_cc(port, tcpm_rp_cc(port)); |
| 3372 | tcpm_set_state(port, SRC_SEND_CAPABILITIES, 0); |
| 3373 | break; |
| 3374 | default: |
| 3375 | break; |
| 3376 | } |
| 3377 | mutex_unlock(&port->lock); |
| 3378 | } |
| 3379 | EXPORT_SYMBOL_GPL(tcpm_update_source_capabilities); |
| 3380 | |
| 3381 | void tcpm_update_sink_capabilities(struct tcpm_port *port, const u32 *pdo, |
| 3382 | unsigned int nr_pdo, |
| 3383 | unsigned int max_snk_mv, |
| 3384 | unsigned int max_snk_ma, |
| 3385 | unsigned int max_snk_mw, |
| 3386 | unsigned int operating_snk_mw) |
| 3387 | { |
| 3388 | mutex_lock(&port->lock); |
| 3389 | port->nr_snk_pdo = tcpm_copy_pdos(port->snk_pdo, pdo, nr_pdo); |
| 3390 | port->max_snk_mv = max_snk_mv; |
| 3391 | port->max_snk_ma = max_snk_ma; |
| 3392 | port->max_snk_mw = max_snk_mw; |
| 3393 | port->operating_snk_mw = operating_snk_mw; |
| 3394 | |
| 3395 | switch (port->state) { |
| 3396 | case SNK_NEGOTIATE_CAPABILITIES: |
| 3397 | case SNK_READY: |
| 3398 | case SNK_TRANSITION_SINK: |
| 3399 | case SNK_TRANSITION_SINK_VBUS: |
| 3400 | tcpm_set_state(port, SNK_NEGOTIATE_CAPABILITIES, 0); |
| 3401 | break; |
| 3402 | default: |
| 3403 | break; |
| 3404 | } |
| 3405 | mutex_unlock(&port->lock); |
| 3406 | } |
| 3407 | EXPORT_SYMBOL_GPL(tcpm_update_sink_capabilities); |
| 3408 | |
| 3409 | struct tcpm_port *tcpm_register_port(struct device *dev, struct tcpc_dev *tcpc) |
| 3410 | { |
| 3411 | struct tcpm_port *port; |
| 3412 | int i, err; |
| 3413 | |
| 3414 | if (!dev || !tcpc || !tcpc->config || |
| 3415 | !tcpc->get_vbus || !tcpc->set_cc || !tcpc->get_cc || |
| 3416 | !tcpc->set_polarity || !tcpc->set_vconn || !tcpc->set_vbus || |
| 3417 | !tcpc->set_pd_rx || !tcpc->set_roles || !tcpc->pd_transmit) |
| 3418 | return ERR_PTR(-EINVAL); |
| 3419 | |
| 3420 | port = devm_kzalloc(dev, sizeof(*port), GFP_KERNEL); |
| 3421 | if (!port) |
| 3422 | return ERR_PTR(-ENOMEM); |
| 3423 | |
| 3424 | port->dev = dev; |
| 3425 | port->tcpc = tcpc; |
| 3426 | |
| 3427 | mutex_init(&port->lock); |
| 3428 | mutex_init(&port->swap_lock); |
| 3429 | |
| 3430 | port->wq = create_singlethread_workqueue(dev_name(dev)); |
| 3431 | if (!port->wq) |
| 3432 | return ERR_PTR(-ENOMEM); |
| 3433 | INIT_DELAYED_WORK(&port->state_machine, tcpm_state_machine_work); |
| 3434 | INIT_DELAYED_WORK(&port->vdm_state_machine, vdm_state_machine_work); |
| 3435 | INIT_WORK(&port->event_work, tcpm_pd_event_handler); |
| 3436 | |
| 3437 | spin_lock_init(&port->pd_event_lock); |
| 3438 | |
| 3439 | init_completion(&port->tx_complete); |
| 3440 | init_completion(&port->swap_complete); |
| 3441 | |
| 3442 | port->nr_src_pdo = tcpm_copy_pdos(port->src_pdo, tcpc->config->src_pdo, |
| 3443 | tcpc->config->nr_src_pdo); |
| 3444 | port->nr_snk_pdo = tcpm_copy_pdos(port->snk_pdo, tcpc->config->snk_pdo, |
| 3445 | tcpc->config->nr_snk_pdo); |
| 3446 | port->nr_snk_vdo = tcpm_copy_vdos(port->snk_vdo, tcpc->config->snk_vdo, |
| 3447 | tcpc->config->nr_snk_vdo); |
| 3448 | |
| 3449 | port->max_snk_mv = tcpc->config->max_snk_mv; |
| 3450 | port->max_snk_ma = tcpc->config->max_snk_ma; |
| 3451 | port->max_snk_mw = tcpc->config->max_snk_mw; |
| 3452 | port->operating_snk_mw = tcpc->config->operating_snk_mw; |
| 3453 | if (!tcpc->config->try_role_hw) |
| 3454 | port->try_role = tcpc->config->default_role; |
| 3455 | else |
| 3456 | port->try_role = TYPEC_NO_PREFERRED_ROLE; |
| 3457 | |
| 3458 | port->typec_caps.prefer_role = tcpc->config->default_role; |
| 3459 | port->typec_caps.type = tcpc->config->type; |
| 3460 | port->typec_caps.revision = 0x0120; /* Type-C spec release 1.2 */ |
| 3461 | port->typec_caps.pd_revision = 0x0200; /* USB-PD spec release 2.0 */ |
| 3462 | port->typec_caps.dr_set = tcpm_dr_set; |
| 3463 | port->typec_caps.pr_set = tcpm_pr_set; |
| 3464 | port->typec_caps.vconn_set = tcpm_vconn_set; |
| 3465 | port->typec_caps.try_role = tcpm_try_role; |
| 3466 | |
| 3467 | port->partner_desc.identity = &port->partner_ident; |
| 3468 | |
| 3469 | /* |
| 3470 | * TODO: |
| 3471 | * - alt_modes, set_alt_mode |
| 3472 | * - {debug,audio}_accessory |
| 3473 | */ |
| 3474 | |
| 3475 | port->typec_port = typec_register_port(port->dev, &port->typec_caps); |
| 3476 | if (!port->typec_port) { |
| 3477 | err = -ENOMEM; |
| 3478 | goto out_destroy_wq; |
| 3479 | } |
| 3480 | |
| 3481 | if (tcpc->config->alt_modes) { |
| 3482 | const struct typec_altmode_desc *paltmode = tcpc->config->alt_modes; |
| 3483 | |
| 3484 | i = 0; |
| 3485 | while (paltmode->svid && i < ARRAY_SIZE(port->port_altmode)) { |
| 3486 | port->port_altmode[i] = |
| 3487 | typec_port_register_altmode(port->typec_port, |
| 3488 | paltmode); |
| 3489 | if (!port->port_altmode[i]) { |
| 3490 | tcpm_log(port, |
| 3491 | "%s: failed to register port alternate mode 0x%x", |
| 3492 | dev_name(dev), paltmode->svid); |
| 3493 | break; |
| 3494 | } |
| 3495 | i++; |
| 3496 | paltmode++; |
| 3497 | } |
| 3498 | } |
| 3499 | |
| 3500 | tcpm_debugfs_init(port); |
| 3501 | mutex_lock(&port->lock); |
| 3502 | tcpm_init(port); |
| 3503 | mutex_unlock(&port->lock); |
| 3504 | |
| 3505 | tcpm_log(port, "%s: registered", dev_name(dev)); |
| 3506 | return port; |
| 3507 | |
| 3508 | out_destroy_wq: |
| 3509 | destroy_workqueue(port->wq); |
| 3510 | return ERR_PTR(err); |
| 3511 | } |
| 3512 | EXPORT_SYMBOL_GPL(tcpm_register_port); |
| 3513 | |
| 3514 | void tcpm_unregister_port(struct tcpm_port *port) |
| 3515 | { |
| 3516 | int i; |
| 3517 | |
| 3518 | for (i = 0; i < ARRAY_SIZE(port->port_altmode); i++) |
| 3519 | typec_unregister_altmode(port->port_altmode[i]); |
| 3520 | typec_unregister_port(port->typec_port); |
| 3521 | tcpm_debugfs_exit(port); |
| 3522 | destroy_workqueue(port->wq); |
| 3523 | } |
| 3524 | EXPORT_SYMBOL_GPL(tcpm_unregister_port); |
| 3525 | |
| 3526 | MODULE_AUTHOR("Guenter Roeck <groeck@chromium.org>"); |
| 3527 | MODULE_DESCRIPTION("USB Type-C Port Manager"); |
| 3528 | MODULE_LICENSE("GPL"); |