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[mirror_ubuntu-hirsute-kernel.git] / drivers / usb / typec / tcpm.c
1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Copyright 2015-2017 Google, Inc
4 *
5 * USB Power Delivery protocol stack.
6 */
7
8 #include <linux/completion.h>
9 #include <linux/debugfs.h>
10 #include <linux/device.h>
11 #include <linux/jiffies.h>
12 #include <linux/kernel.h>
13 #include <linux/module.h>
14 #include <linux/mutex.h>
15 #include <linux/proc_fs.h>
16 #include <linux/sched/clock.h>
17 #include <linux/seq_file.h>
18 #include <linux/slab.h>
19 #include <linux/spinlock.h>
20 #include <linux/usb/pd.h>
21 #include <linux/usb/pd_bdo.h>
22 #include <linux/usb/pd_vdo.h>
23 #include <linux/usb/tcpm.h>
24 #include <linux/usb/typec.h>
25 #include <linux/workqueue.h>
26
27 #define FOREACH_STATE(S) \
28 S(INVALID_STATE), \
29 S(DRP_TOGGLING), \
30 S(SRC_UNATTACHED), \
31 S(SRC_ATTACH_WAIT), \
32 S(SRC_ATTACHED), \
33 S(SRC_STARTUP), \
34 S(SRC_SEND_CAPABILITIES), \
35 S(SRC_NEGOTIATE_CAPABILITIES), \
36 S(SRC_TRANSITION_SUPPLY), \
37 S(SRC_READY), \
38 S(SRC_WAIT_NEW_CAPABILITIES), \
39 \
40 S(SNK_UNATTACHED), \
41 S(SNK_ATTACH_WAIT), \
42 S(SNK_DEBOUNCED), \
43 S(SNK_ATTACHED), \
44 S(SNK_STARTUP), \
45 S(SNK_DISCOVERY), \
46 S(SNK_DISCOVERY_DEBOUNCE), \
47 S(SNK_DISCOVERY_DEBOUNCE_DONE), \
48 S(SNK_WAIT_CAPABILITIES), \
49 S(SNK_NEGOTIATE_CAPABILITIES), \
50 S(SNK_TRANSITION_SINK), \
51 S(SNK_TRANSITION_SINK_VBUS), \
52 S(SNK_READY), \
53 \
54 S(ACC_UNATTACHED), \
55 S(DEBUG_ACC_ATTACHED), \
56 S(AUDIO_ACC_ATTACHED), \
57 S(AUDIO_ACC_DEBOUNCE), \
58 \
59 S(HARD_RESET_SEND), \
60 S(HARD_RESET_START), \
61 S(SRC_HARD_RESET_VBUS_OFF), \
62 S(SRC_HARD_RESET_VBUS_ON), \
63 S(SNK_HARD_RESET_SINK_OFF), \
64 S(SNK_HARD_RESET_WAIT_VBUS), \
65 S(SNK_HARD_RESET_SINK_ON), \
66 \
67 S(SOFT_RESET), \
68 S(SOFT_RESET_SEND), \
69 \
70 S(DR_SWAP_ACCEPT), \
71 S(DR_SWAP_SEND), \
72 S(DR_SWAP_SEND_TIMEOUT), \
73 S(DR_SWAP_CANCEL), \
74 S(DR_SWAP_CHANGE_DR), \
75 \
76 S(PR_SWAP_ACCEPT), \
77 S(PR_SWAP_SEND), \
78 S(PR_SWAP_SEND_TIMEOUT), \
79 S(PR_SWAP_CANCEL), \
80 S(PR_SWAP_START), \
81 S(PR_SWAP_SRC_SNK_TRANSITION_OFF), \
82 S(PR_SWAP_SRC_SNK_SOURCE_OFF), \
83 S(PR_SWAP_SRC_SNK_SOURCE_OFF_CC_DEBOUNCED), \
84 S(PR_SWAP_SRC_SNK_SINK_ON), \
85 S(PR_SWAP_SNK_SRC_SINK_OFF), \
86 S(PR_SWAP_SNK_SRC_SOURCE_ON), \
87 S(PR_SWAP_SNK_SRC_SOURCE_ON_VBUS_RAMPED_UP), \
88 \
89 S(VCONN_SWAP_ACCEPT), \
90 S(VCONN_SWAP_SEND), \
91 S(VCONN_SWAP_SEND_TIMEOUT), \
92 S(VCONN_SWAP_CANCEL), \
93 S(VCONN_SWAP_START), \
94 S(VCONN_SWAP_WAIT_FOR_VCONN), \
95 S(VCONN_SWAP_TURN_ON_VCONN), \
96 S(VCONN_SWAP_TURN_OFF_VCONN), \
97 \
98 S(SNK_TRY), \
99 S(SNK_TRY_WAIT), \
100 S(SNK_TRY_WAIT_DEBOUNCE), \
101 S(SNK_TRY_WAIT_DEBOUNCE_CHECK_VBUS), \
102 S(SRC_TRYWAIT), \
103 S(SRC_TRYWAIT_DEBOUNCE), \
104 S(SRC_TRYWAIT_UNATTACHED), \
105 \
106 S(SRC_TRY), \
107 S(SRC_TRY_WAIT), \
108 S(SRC_TRY_DEBOUNCE), \
109 S(SNK_TRYWAIT), \
110 S(SNK_TRYWAIT_DEBOUNCE), \
111 S(SNK_TRYWAIT_VBUS), \
112 S(BIST_RX), \
113 \
114 S(ERROR_RECOVERY), \
115 S(PORT_RESET), \
116 S(PORT_RESET_WAIT_OFF)
117
118 #define GENERATE_ENUM(e) e
119 #define GENERATE_STRING(s) #s
120
121 enum tcpm_state {
122 FOREACH_STATE(GENERATE_ENUM)
123 };
124
125 static const char * const tcpm_states[] = {
126 FOREACH_STATE(GENERATE_STRING)
127 };
128
129 enum vdm_states {
130 VDM_STATE_ERR_BUSY = -3,
131 VDM_STATE_ERR_SEND = -2,
132 VDM_STATE_ERR_TMOUT = -1,
133 VDM_STATE_DONE = 0,
134 /* Anything >0 represents an active state */
135 VDM_STATE_READY = 1,
136 VDM_STATE_BUSY = 2,
137 VDM_STATE_WAIT_RSP_BUSY = 3,
138 };
139
140 enum pd_msg_request {
141 PD_MSG_NONE = 0,
142 PD_MSG_CTRL_REJECT,
143 PD_MSG_CTRL_WAIT,
144 PD_MSG_DATA_SINK_CAP,
145 PD_MSG_DATA_SOURCE_CAP,
146 };
147
148 /* Events from low level driver */
149
150 #define TCPM_CC_EVENT BIT(0)
151 #define TCPM_VBUS_EVENT BIT(1)
152 #define TCPM_RESET_EVENT BIT(2)
153
154 #define LOG_BUFFER_ENTRIES 1024
155 #define LOG_BUFFER_ENTRY_SIZE 128
156
157 /* Alternate mode support */
158
159 #define SVID_DISCOVERY_MAX 16
160
161 struct pd_mode_data {
162 int svid_index; /* current SVID index */
163 int nsvids;
164 u16 svids[SVID_DISCOVERY_MAX];
165 int altmodes; /* number of alternate modes */
166 struct typec_altmode_desc altmode_desc[SVID_DISCOVERY_MAX];
167 };
168
169 struct tcpm_port {
170 struct device *dev;
171
172 struct mutex lock; /* tcpm state machine lock */
173 struct workqueue_struct *wq;
174
175 struct typec_capability typec_caps;
176 struct typec_port *typec_port;
177
178 struct tcpc_dev *tcpc;
179
180 enum typec_role vconn_role;
181 enum typec_role pwr_role;
182 enum typec_data_role data_role;
183 enum typec_pwr_opmode pwr_opmode;
184
185 struct usb_pd_identity partner_ident;
186 struct typec_partner_desc partner_desc;
187 struct typec_partner *partner;
188
189 enum typec_cc_status cc_req;
190
191 enum typec_cc_status cc1;
192 enum typec_cc_status cc2;
193 enum typec_cc_polarity polarity;
194
195 bool attached;
196 bool connected;
197 enum typec_port_type port_type;
198 bool vbus_present;
199 bool vbus_never_low;
200 bool vbus_source;
201 bool vbus_charge;
202
203 bool send_discover;
204 bool op_vsafe5v;
205
206 int try_role;
207 int try_snk_count;
208 int try_src_count;
209
210 enum pd_msg_request queued_message;
211
212 enum tcpm_state enter_state;
213 enum tcpm_state prev_state;
214 enum tcpm_state state;
215 enum tcpm_state delayed_state;
216 unsigned long delayed_runtime;
217 unsigned long delay_ms;
218
219 spinlock_t pd_event_lock;
220 u32 pd_events;
221
222 struct work_struct event_work;
223 struct delayed_work state_machine;
224 struct delayed_work vdm_state_machine;
225 bool state_machine_running;
226
227 struct completion tx_complete;
228 enum tcpm_transmit_status tx_status;
229
230 struct mutex swap_lock; /* swap command lock */
231 bool swap_pending;
232 bool non_pd_role_swap;
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 unsigned int nr_fixed; /* number of fixed sink PDOs */
256 unsigned int nr_var; /* number of variable sink PDOs */
257 unsigned int nr_batt; /* number of battery sink PDOs */
258 u32 snk_vdo[VDO_MAX_OBJECTS];
259 unsigned int nr_snk_vdo;
260
261 unsigned int max_snk_mv;
262 unsigned int max_snk_ma;
263 unsigned int max_snk_mw;
264 unsigned int operating_snk_mw;
265
266 /* Requested current / voltage */
267 u32 current_limit;
268 u32 supply_voltage;
269
270 u32 bist_request;
271
272 /* PD state for Vendor Defined Messages */
273 enum vdm_states vdm_state;
274 u32 vdm_retries;
275 /* next Vendor Defined Message to send */
276 u32 vdo_data[VDO_MAX_SIZE];
277 u8 vdo_count;
278 /* VDO to retry if UFP responder replied busy */
279 u32 vdo_retry;
280
281 /* Alternate mode data */
282
283 struct pd_mode_data mode_data;
284 struct typec_altmode *partner_altmode[SVID_DISCOVERY_MAX];
285 struct typec_altmode *port_altmode[SVID_DISCOVERY_MAX];
286
287 /* Deadline in jiffies to exit src_try_wait state */
288 unsigned long max_wait;
289
290 #ifdef CONFIG_DEBUG_FS
291 struct dentry *dentry;
292 struct mutex logbuffer_lock; /* log buffer access lock */
293 int logbuffer_head;
294 int logbuffer_tail;
295 u8 *logbuffer[LOG_BUFFER_ENTRIES];
296 #endif
297 };
298
299 struct pd_rx_event {
300 struct work_struct work;
301 struct tcpm_port *port;
302 struct pd_message msg;
303 };
304
305 #define tcpm_cc_is_sink(cc) \
306 ((cc) == TYPEC_CC_RP_DEF || (cc) == TYPEC_CC_RP_1_5 || \
307 (cc) == TYPEC_CC_RP_3_0)
308
309 #define tcpm_port_is_sink(port) \
310 ((tcpm_cc_is_sink((port)->cc1) && !tcpm_cc_is_sink((port)->cc2)) || \
311 (tcpm_cc_is_sink((port)->cc2) && !tcpm_cc_is_sink((port)->cc1)))
312
313 #define tcpm_cc_is_source(cc) ((cc) == TYPEC_CC_RD)
314 #define tcpm_cc_is_audio(cc) ((cc) == TYPEC_CC_RA)
315 #define tcpm_cc_is_open(cc) ((cc) == TYPEC_CC_OPEN)
316
317 #define tcpm_port_is_source(port) \
318 ((tcpm_cc_is_source((port)->cc1) && \
319 !tcpm_cc_is_source((port)->cc2)) || \
320 (tcpm_cc_is_source((port)->cc2) && \
321 !tcpm_cc_is_source((port)->cc1)))
322
323 #define tcpm_port_is_debug(port) \
324 (tcpm_cc_is_source((port)->cc1) && tcpm_cc_is_source((port)->cc2))
325
326 #define tcpm_port_is_audio(port) \
327 (tcpm_cc_is_audio((port)->cc1) && tcpm_cc_is_audio((port)->cc2))
328
329 #define tcpm_port_is_audio_detached(port) \
330 ((tcpm_cc_is_audio((port)->cc1) && tcpm_cc_is_open((port)->cc2)) || \
331 (tcpm_cc_is_audio((port)->cc2) && tcpm_cc_is_open((port)->cc1)))
332
333 #define tcpm_try_snk(port) \
334 ((port)->try_snk_count == 0 && (port)->try_role == TYPEC_SINK && \
335 (port)->port_type == TYPEC_PORT_DRP)
336
337 #define tcpm_try_src(port) \
338 ((port)->try_src_count == 0 && (port)->try_role == TYPEC_SOURCE && \
339 (port)->port_type == TYPEC_PORT_DRP)
340
341 static enum tcpm_state tcpm_default_state(struct tcpm_port *port)
342 {
343 if (port->port_type == TYPEC_PORT_DRP) {
344 if (port->try_role == TYPEC_SINK)
345 return SNK_UNATTACHED;
346 else if (port->try_role == TYPEC_SOURCE)
347 return SRC_UNATTACHED;
348 else if (port->tcpc->config->default_role == TYPEC_SINK)
349 return SNK_UNATTACHED;
350 /* Fall through to return SRC_UNATTACHED */
351 } else if (port->port_type == TYPEC_PORT_UFP) {
352 return SNK_UNATTACHED;
353 }
354 return SRC_UNATTACHED;
355 }
356
357 static inline
358 struct tcpm_port *typec_cap_to_tcpm(const struct typec_capability *cap)
359 {
360 return container_of(cap, struct tcpm_port, typec_caps);
361 }
362
363 static bool tcpm_port_is_disconnected(struct tcpm_port *port)
364 {
365 return (!port->attached && port->cc1 == TYPEC_CC_OPEN &&
366 port->cc2 == TYPEC_CC_OPEN) ||
367 (port->attached && ((port->polarity == TYPEC_POLARITY_CC1 &&
368 port->cc1 == TYPEC_CC_OPEN) ||
369 (port->polarity == TYPEC_POLARITY_CC2 &&
370 port->cc2 == TYPEC_CC_OPEN)));
371 }
372
373 /*
374 * Logging
375 */
376
377 #ifdef CONFIG_DEBUG_FS
378
379 static bool tcpm_log_full(struct tcpm_port *port)
380 {
381 return port->logbuffer_tail ==
382 (port->logbuffer_head + 1) % LOG_BUFFER_ENTRIES;
383 }
384
385 __printf(2, 0)
386 static void _tcpm_log(struct tcpm_port *port, const char *fmt, va_list args)
387 {
388 char tmpbuffer[LOG_BUFFER_ENTRY_SIZE];
389 u64 ts_nsec = local_clock();
390 unsigned long rem_nsec;
391
392 if (!port->logbuffer[port->logbuffer_head]) {
393 port->logbuffer[port->logbuffer_head] =
394 kzalloc(LOG_BUFFER_ENTRY_SIZE, GFP_KERNEL);
395 if (!port->logbuffer[port->logbuffer_head])
396 return;
397 }
398
399 vsnprintf(tmpbuffer, sizeof(tmpbuffer), fmt, args);
400
401 mutex_lock(&port->logbuffer_lock);
402
403 if (tcpm_log_full(port)) {
404 port->logbuffer_head = max(port->logbuffer_head - 1, 0);
405 strcpy(tmpbuffer, "overflow");
406 }
407
408 if (port->logbuffer_head < 0 ||
409 port->logbuffer_head >= LOG_BUFFER_ENTRIES) {
410 dev_warn(port->dev,
411 "Bad log buffer index %d\n", port->logbuffer_head);
412 goto abort;
413 }
414
415 if (!port->logbuffer[port->logbuffer_head]) {
416 dev_warn(port->dev,
417 "Log buffer index %d is NULL\n", port->logbuffer_head);
418 goto abort;
419 }
420
421 rem_nsec = do_div(ts_nsec, 1000000000);
422 scnprintf(port->logbuffer[port->logbuffer_head],
423 LOG_BUFFER_ENTRY_SIZE, "[%5lu.%06lu] %s",
424 (unsigned long)ts_nsec, rem_nsec / 1000,
425 tmpbuffer);
426 port->logbuffer_head = (port->logbuffer_head + 1) % LOG_BUFFER_ENTRIES;
427
428 abort:
429 mutex_unlock(&port->logbuffer_lock);
430 }
431
432 __printf(2, 3)
433 static void tcpm_log(struct tcpm_port *port, const char *fmt, ...)
434 {
435 va_list args;
436
437 /* Do not log while disconnected and unattached */
438 if (tcpm_port_is_disconnected(port) &&
439 (port->state == SRC_UNATTACHED || port->state == SNK_UNATTACHED ||
440 port->state == DRP_TOGGLING))
441 return;
442
443 va_start(args, fmt);
444 _tcpm_log(port, fmt, args);
445 va_end(args);
446 }
447
448 __printf(2, 3)
449 static void tcpm_log_force(struct tcpm_port *port, const char *fmt, ...)
450 {
451 va_list args;
452
453 va_start(args, fmt);
454 _tcpm_log(port, fmt, args);
455 va_end(args);
456 }
457
458 static void tcpm_log_source_caps(struct tcpm_port *port)
459 {
460 int i;
461
462 for (i = 0; i < port->nr_source_caps; i++) {
463 u32 pdo = port->source_caps[i];
464 enum pd_pdo_type type = pdo_type(pdo);
465 char msg[64];
466
467 switch (type) {
468 case PDO_TYPE_FIXED:
469 scnprintf(msg, sizeof(msg),
470 "%u mV, %u mA [%s%s%s%s%s%s]",
471 pdo_fixed_voltage(pdo),
472 pdo_max_current(pdo),
473 (pdo & PDO_FIXED_DUAL_ROLE) ?
474 "R" : "",
475 (pdo & PDO_FIXED_SUSPEND) ?
476 "S" : "",
477 (pdo & PDO_FIXED_HIGHER_CAP) ?
478 "H" : "",
479 (pdo & PDO_FIXED_USB_COMM) ?
480 "U" : "",
481 (pdo & PDO_FIXED_DATA_SWAP) ?
482 "D" : "",
483 (pdo & PDO_FIXED_EXTPOWER) ?
484 "E" : "");
485 break;
486 case PDO_TYPE_VAR:
487 scnprintf(msg, sizeof(msg),
488 "%u-%u mV, %u mA",
489 pdo_min_voltage(pdo),
490 pdo_max_voltage(pdo),
491 pdo_max_current(pdo));
492 break;
493 case PDO_TYPE_BATT:
494 scnprintf(msg, sizeof(msg),
495 "%u-%u mV, %u mW",
496 pdo_min_voltage(pdo),
497 pdo_max_voltage(pdo),
498 pdo_max_power(pdo));
499 break;
500 default:
501 strcpy(msg, "undefined");
502 break;
503 }
504 tcpm_log(port, " PDO %d: type %d, %s",
505 i, type, msg);
506 }
507 }
508
509 static int tcpm_seq_show(struct seq_file *s, void *v)
510 {
511 struct tcpm_port *port = (struct tcpm_port *)s->private;
512 int tail;
513
514 mutex_lock(&port->logbuffer_lock);
515 tail = port->logbuffer_tail;
516 while (tail != port->logbuffer_head) {
517 seq_printf(s, "%s\n", port->logbuffer[tail]);
518 tail = (tail + 1) % LOG_BUFFER_ENTRIES;
519 }
520 if (!seq_has_overflowed(s))
521 port->logbuffer_tail = tail;
522 mutex_unlock(&port->logbuffer_lock);
523
524 return 0;
525 }
526
527 static int tcpm_debug_open(struct inode *inode, struct file *file)
528 {
529 return single_open(file, tcpm_seq_show, inode->i_private);
530 }
531
532 static const struct file_operations tcpm_debug_operations = {
533 .open = tcpm_debug_open,
534 .llseek = seq_lseek,
535 .read = seq_read,
536 .release = single_release,
537 };
538
539 static struct dentry *rootdir;
540
541 static int tcpm_debugfs_init(struct tcpm_port *port)
542 {
543 mutex_init(&port->logbuffer_lock);
544 /* /sys/kernel/debug/tcpm/usbcX */
545 if (!rootdir) {
546 rootdir = debugfs_create_dir("tcpm", NULL);
547 if (!rootdir)
548 return -ENOMEM;
549 }
550
551 port->dentry = debugfs_create_file(dev_name(port->dev),
552 S_IFREG | 0444, rootdir,
553 port, &tcpm_debug_operations);
554
555 return 0;
556 }
557
558 static void tcpm_debugfs_exit(struct tcpm_port *port)
559 {
560 debugfs_remove(port->dentry);
561 }
562
563 #else
564
565 __printf(2, 3)
566 static void tcpm_log(const struct tcpm_port *port, const char *fmt, ...) { }
567 __printf(2, 3)
568 static void tcpm_log_force(struct tcpm_port *port, const char *fmt, ...) { }
569 static void tcpm_log_source_caps(struct tcpm_port *port) { }
570 static int tcpm_debugfs_init(const struct tcpm_port *port) { return 0; }
571 static void tcpm_debugfs_exit(const struct tcpm_port *port) { }
572
573 #endif
574
575 static int tcpm_pd_transmit(struct tcpm_port *port,
576 enum tcpm_transmit_type type,
577 const struct pd_message *msg)
578 {
579 unsigned long timeout;
580 int ret;
581
582 if (msg)
583 tcpm_log(port, "PD TX, header: %#x", le16_to_cpu(msg->header));
584 else
585 tcpm_log(port, "PD TX, type: %#x", type);
586
587 reinit_completion(&port->tx_complete);
588 ret = port->tcpc->pd_transmit(port->tcpc, type, msg);
589 if (ret < 0)
590 return ret;
591
592 mutex_unlock(&port->lock);
593 timeout = wait_for_completion_timeout(&port->tx_complete,
594 msecs_to_jiffies(PD_T_TCPC_TX_TIMEOUT));
595 mutex_lock(&port->lock);
596 if (!timeout)
597 return -ETIMEDOUT;
598
599 switch (port->tx_status) {
600 case TCPC_TX_SUCCESS:
601 port->message_id = (port->message_id + 1) & PD_HEADER_ID_MASK;
602 return 0;
603 case TCPC_TX_DISCARDED:
604 return -EAGAIN;
605 case TCPC_TX_FAILED:
606 default:
607 return -EIO;
608 }
609 }
610
611 void tcpm_pd_transmit_complete(struct tcpm_port *port,
612 enum tcpm_transmit_status status)
613 {
614 tcpm_log(port, "PD TX complete, status: %u", status);
615 port->tx_status = status;
616 complete(&port->tx_complete);
617 }
618 EXPORT_SYMBOL_GPL(tcpm_pd_transmit_complete);
619
620 static int tcpm_mux_set(struct tcpm_port *port, enum tcpc_mux_mode mode,
621 enum tcpc_usb_switch config)
622 {
623 int ret = 0;
624
625 tcpm_log(port, "Requesting mux mode %d, config %d, polarity %d",
626 mode, config, port->polarity);
627
628 if (port->tcpc->mux)
629 ret = port->tcpc->mux->set(port->tcpc->mux, mode, config,
630 port->polarity);
631
632 return ret;
633 }
634
635 static int tcpm_set_polarity(struct tcpm_port *port,
636 enum typec_cc_polarity polarity)
637 {
638 int ret;
639
640 tcpm_log(port, "polarity %d", polarity);
641
642 ret = port->tcpc->set_polarity(port->tcpc, polarity);
643 if (ret < 0)
644 return ret;
645
646 port->polarity = polarity;
647
648 return 0;
649 }
650
651 static int tcpm_set_vconn(struct tcpm_port *port, bool enable)
652 {
653 int ret;
654
655 tcpm_log(port, "vconn:=%d", enable);
656
657 ret = port->tcpc->set_vconn(port->tcpc, enable);
658 if (!ret) {
659 port->vconn_role = enable ? TYPEC_SOURCE : TYPEC_SINK;
660 typec_set_vconn_role(port->typec_port, port->vconn_role);
661 }
662
663 return ret;
664 }
665
666 static u32 tcpm_get_current_limit(struct tcpm_port *port)
667 {
668 enum typec_cc_status cc;
669 u32 limit;
670
671 cc = port->polarity ? port->cc2 : port->cc1;
672 switch (cc) {
673 case TYPEC_CC_RP_1_5:
674 limit = 1500;
675 break;
676 case TYPEC_CC_RP_3_0:
677 limit = 3000;
678 break;
679 case TYPEC_CC_RP_DEF:
680 default:
681 if (port->tcpc->get_current_limit)
682 limit = port->tcpc->get_current_limit(port->tcpc);
683 else
684 limit = 0;
685 break;
686 }
687
688 return limit;
689 }
690
691 static int tcpm_set_current_limit(struct tcpm_port *port, u32 max_ma, u32 mv)
692 {
693 int ret = -EOPNOTSUPP;
694
695 tcpm_log(port, "Setting voltage/current limit %u mV %u mA", mv, max_ma);
696
697 if (port->tcpc->set_current_limit)
698 ret = port->tcpc->set_current_limit(port->tcpc, max_ma, mv);
699
700 return ret;
701 }
702
703 /*
704 * Determine RP value to set based on maximum current supported
705 * by a port if configured as source.
706 * Returns CC value to report to link partner.
707 */
708 static enum typec_cc_status tcpm_rp_cc(struct tcpm_port *port)
709 {
710 const u32 *src_pdo = port->src_pdo;
711 int nr_pdo = port->nr_src_pdo;
712 int i;
713
714 /*
715 * Search for first entry with matching voltage.
716 * It should report the maximum supported current.
717 */
718 for (i = 0; i < nr_pdo; i++) {
719 const u32 pdo = src_pdo[i];
720
721 if (pdo_type(pdo) == PDO_TYPE_FIXED &&
722 pdo_fixed_voltage(pdo) == 5000) {
723 unsigned int curr = pdo_max_current(pdo);
724
725 if (curr >= 3000)
726 return TYPEC_CC_RP_3_0;
727 else if (curr >= 1500)
728 return TYPEC_CC_RP_1_5;
729 return TYPEC_CC_RP_DEF;
730 }
731 }
732
733 return TYPEC_CC_RP_DEF;
734 }
735
736 static int tcpm_set_attached_state(struct tcpm_port *port, bool attached)
737 {
738 return port->tcpc->set_roles(port->tcpc, attached, port->pwr_role,
739 port->data_role);
740 }
741
742 static int tcpm_set_roles(struct tcpm_port *port, bool attached,
743 enum typec_role role, enum typec_data_role data)
744 {
745 int ret;
746
747 if (data == TYPEC_HOST)
748 ret = tcpm_mux_set(port, TYPEC_MUX_USB,
749 TCPC_USB_SWITCH_CONNECT);
750 else
751 ret = tcpm_mux_set(port, TYPEC_MUX_NONE,
752 TCPC_USB_SWITCH_DISCONNECT);
753 if (ret < 0)
754 return ret;
755
756 ret = port->tcpc->set_roles(port->tcpc, attached, role, data);
757 if (ret < 0)
758 return ret;
759
760 port->pwr_role = role;
761 port->data_role = data;
762 typec_set_data_role(port->typec_port, data);
763 typec_set_pwr_role(port->typec_port, role);
764
765 return 0;
766 }
767
768 static int tcpm_set_pwr_role(struct tcpm_port *port, enum typec_role role)
769 {
770 int ret;
771
772 ret = port->tcpc->set_roles(port->tcpc, true, role,
773 port->data_role);
774 if (ret < 0)
775 return ret;
776
777 port->pwr_role = role;
778 typec_set_pwr_role(port->typec_port, role);
779
780 return 0;
781 }
782
783 static int tcpm_pd_send_source_caps(struct tcpm_port *port)
784 {
785 struct pd_message msg;
786 int i;
787
788 memset(&msg, 0, sizeof(msg));
789 if (!port->nr_src_pdo) {
790 /* No source capabilities defined, sink only */
791 msg.header = PD_HEADER_LE(PD_CTRL_REJECT,
792 port->pwr_role,
793 port->data_role,
794 port->message_id, 0);
795 } else {
796 msg.header = PD_HEADER_LE(PD_DATA_SOURCE_CAP,
797 port->pwr_role,
798 port->data_role,
799 port->message_id,
800 port->nr_src_pdo);
801 }
802 for (i = 0; i < port->nr_src_pdo; i++)
803 msg.payload[i] = cpu_to_le32(port->src_pdo[i]);
804
805 return tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
806 }
807
808 static int tcpm_pd_send_sink_caps(struct tcpm_port *port)
809 {
810 struct pd_message msg;
811 int i;
812
813 memset(&msg, 0, sizeof(msg));
814 if (!port->nr_snk_pdo) {
815 /* No sink capabilities defined, source only */
816 msg.header = PD_HEADER_LE(PD_CTRL_REJECT,
817 port->pwr_role,
818 port->data_role,
819 port->message_id, 0);
820 } else {
821 msg.header = PD_HEADER_LE(PD_DATA_SINK_CAP,
822 port->pwr_role,
823 port->data_role,
824 port->message_id,
825 port->nr_snk_pdo);
826 }
827 for (i = 0; i < port->nr_snk_pdo; i++)
828 msg.payload[i] = cpu_to_le32(port->snk_pdo[i]);
829
830 return tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
831 }
832
833 static void tcpm_set_state(struct tcpm_port *port, enum tcpm_state state,
834 unsigned int delay_ms)
835 {
836 if (delay_ms) {
837 tcpm_log(port, "pending state change %s -> %s @ %u ms",
838 tcpm_states[port->state], tcpm_states[state],
839 delay_ms);
840 port->delayed_state = state;
841 mod_delayed_work(port->wq, &port->state_machine,
842 msecs_to_jiffies(delay_ms));
843 port->delayed_runtime = jiffies + msecs_to_jiffies(delay_ms);
844 port->delay_ms = delay_ms;
845 } else {
846 tcpm_log(port, "state change %s -> %s",
847 tcpm_states[port->state], tcpm_states[state]);
848 port->delayed_state = INVALID_STATE;
849 port->prev_state = port->state;
850 port->state = state;
851 /*
852 * Don't re-queue the state machine work item if we're currently
853 * in the state machine and we're immediately changing states.
854 * tcpm_state_machine_work() will continue running the state
855 * machine.
856 */
857 if (!port->state_machine_running)
858 mod_delayed_work(port->wq, &port->state_machine, 0);
859 }
860 }
861
862 static void tcpm_set_state_cond(struct tcpm_port *port, enum tcpm_state state,
863 unsigned int delay_ms)
864 {
865 if (port->enter_state == port->state)
866 tcpm_set_state(port, state, delay_ms);
867 else
868 tcpm_log(port,
869 "skipped %sstate change %s -> %s [%u ms], context state %s",
870 delay_ms ? "delayed " : "",
871 tcpm_states[port->state], tcpm_states[state],
872 delay_ms, tcpm_states[port->enter_state]);
873 }
874
875 static void tcpm_queue_message(struct tcpm_port *port,
876 enum pd_msg_request message)
877 {
878 port->queued_message = message;
879 mod_delayed_work(port->wq, &port->state_machine, 0);
880 }
881
882 /*
883 * VDM/VDO handling functions
884 */
885 static void tcpm_queue_vdm(struct tcpm_port *port, const u32 header,
886 const u32 *data, int cnt)
887 {
888 port->vdo_count = cnt + 1;
889 port->vdo_data[0] = header;
890 memcpy(&port->vdo_data[1], data, sizeof(u32) * cnt);
891 /* Set ready, vdm state machine will actually send */
892 port->vdm_retries = 0;
893 port->vdm_state = VDM_STATE_READY;
894 }
895
896 static void svdm_consume_identity(struct tcpm_port *port, const __le32 *payload,
897 int cnt)
898 {
899 u32 vdo = le32_to_cpu(payload[VDO_INDEX_IDH]);
900 u32 product = le32_to_cpu(payload[VDO_INDEX_PRODUCT]);
901
902 memset(&port->mode_data, 0, sizeof(port->mode_data));
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]) {
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 /* enter alternate mode if/when implemented */
1079 }
1080 break;
1081 case CMD_ENTER_MODE:
1082 break;
1083 default:
1084 break;
1085 }
1086 break;
1087 default:
1088 break;
1089 }
1090
1091 return rlen;
1092 }
1093
1094 static void tcpm_handle_vdm_request(struct tcpm_port *port,
1095 const __le32 *payload, int cnt)
1096 {
1097 int rlen = 0;
1098 u32 response[8] = { };
1099 u32 p0 = le32_to_cpu(payload[0]);
1100
1101 if (port->vdm_state == VDM_STATE_BUSY) {
1102 /* If UFP responded busy retry after timeout */
1103 if (PD_VDO_CMDT(p0) == CMDT_RSP_BUSY) {
1104 port->vdm_state = VDM_STATE_WAIT_RSP_BUSY;
1105 port->vdo_retry = (p0 & ~VDO_CMDT_MASK) |
1106 CMDT_INIT;
1107 mod_delayed_work(port->wq, &port->vdm_state_machine,
1108 msecs_to_jiffies(PD_T_VDM_BUSY));
1109 return;
1110 }
1111 port->vdm_state = VDM_STATE_DONE;
1112 }
1113
1114 if (PD_VDO_SVDM(p0))
1115 rlen = tcpm_pd_svdm(port, payload, cnt, response);
1116
1117 if (rlen > 0) {
1118 tcpm_queue_vdm(port, response[0], &response[1], rlen - 1);
1119 mod_delayed_work(port->wq, &port->vdm_state_machine, 0);
1120 }
1121 }
1122
1123 static void tcpm_send_vdm(struct tcpm_port *port, u32 vid, int cmd,
1124 const u32 *data, int count)
1125 {
1126 u32 header;
1127
1128 if (WARN_ON(count > VDO_MAX_SIZE - 1))
1129 count = VDO_MAX_SIZE - 1;
1130
1131 /* set VDM header with VID & CMD */
1132 header = VDO(vid, ((vid & USB_SID_PD) == USB_SID_PD) ?
1133 1 : (PD_VDO_CMD(cmd) <= CMD_ATTENTION), cmd);
1134 tcpm_queue_vdm(port, header, data, count);
1135
1136 mod_delayed_work(port->wq, &port->vdm_state_machine, 0);
1137 }
1138
1139 static unsigned int vdm_ready_timeout(u32 vdm_hdr)
1140 {
1141 unsigned int timeout;
1142 int cmd = PD_VDO_CMD(vdm_hdr);
1143
1144 /* its not a structured VDM command */
1145 if (!PD_VDO_SVDM(vdm_hdr))
1146 return PD_T_VDM_UNSTRUCTURED;
1147
1148 switch (PD_VDO_CMDT(vdm_hdr)) {
1149 case CMDT_INIT:
1150 if (cmd == CMD_ENTER_MODE || cmd == CMD_EXIT_MODE)
1151 timeout = PD_T_VDM_WAIT_MODE_E;
1152 else
1153 timeout = PD_T_VDM_SNDR_RSP;
1154 break;
1155 default:
1156 if (cmd == CMD_ENTER_MODE || cmd == CMD_EXIT_MODE)
1157 timeout = PD_T_VDM_E_MODE;
1158 else
1159 timeout = PD_T_VDM_RCVR_RSP;
1160 break;
1161 }
1162 return timeout;
1163 }
1164
1165 static void vdm_run_state_machine(struct tcpm_port *port)
1166 {
1167 struct pd_message msg;
1168 int i, res;
1169
1170 switch (port->vdm_state) {
1171 case VDM_STATE_READY:
1172 /* Only transmit VDM if attached */
1173 if (!port->attached) {
1174 port->vdm_state = VDM_STATE_ERR_BUSY;
1175 break;
1176 }
1177
1178 /*
1179 * if there's traffic or we're not in PDO ready state don't send
1180 * a VDM.
1181 */
1182 if (port->state != SRC_READY && port->state != SNK_READY)
1183 break;
1184
1185 /* Prepare and send VDM */
1186 memset(&msg, 0, sizeof(msg));
1187 msg.header = PD_HEADER_LE(PD_DATA_VENDOR_DEF,
1188 port->pwr_role,
1189 port->data_role,
1190 port->message_id, port->vdo_count);
1191 for (i = 0; i < port->vdo_count; i++)
1192 msg.payload[i] = cpu_to_le32(port->vdo_data[i]);
1193 res = tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
1194 if (res < 0) {
1195 port->vdm_state = VDM_STATE_ERR_SEND;
1196 } else {
1197 unsigned long timeout;
1198
1199 port->vdm_retries = 0;
1200 port->vdm_state = VDM_STATE_BUSY;
1201 timeout = vdm_ready_timeout(port->vdo_data[0]);
1202 mod_delayed_work(port->wq, &port->vdm_state_machine,
1203 timeout);
1204 }
1205 break;
1206 case VDM_STATE_WAIT_RSP_BUSY:
1207 port->vdo_data[0] = port->vdo_retry;
1208 port->vdo_count = 1;
1209 port->vdm_state = VDM_STATE_READY;
1210 break;
1211 case VDM_STATE_BUSY:
1212 port->vdm_state = VDM_STATE_ERR_TMOUT;
1213 break;
1214 case VDM_STATE_ERR_SEND:
1215 /*
1216 * A partner which does not support USB PD will not reply,
1217 * so this is not a fatal error. At the same time, some
1218 * devices may not return GoodCRC under some circumstances,
1219 * so we need to retry.
1220 */
1221 if (port->vdm_retries < 3) {
1222 tcpm_log(port, "VDM Tx error, retry");
1223 port->vdm_retries++;
1224 port->vdm_state = VDM_STATE_READY;
1225 }
1226 break;
1227 default:
1228 break;
1229 }
1230 }
1231
1232 static void vdm_state_machine_work(struct work_struct *work)
1233 {
1234 struct tcpm_port *port = container_of(work, struct tcpm_port,
1235 vdm_state_machine.work);
1236 enum vdm_states prev_state;
1237
1238 mutex_lock(&port->lock);
1239
1240 /*
1241 * Continue running as long as the port is not busy and there was
1242 * a state change.
1243 */
1244 do {
1245 prev_state = port->vdm_state;
1246 vdm_run_state_machine(port);
1247 } while (port->vdm_state != prev_state &&
1248 port->vdm_state != VDM_STATE_BUSY);
1249
1250 mutex_unlock(&port->lock);
1251 }
1252
1253 enum pdo_err {
1254 PDO_NO_ERR,
1255 PDO_ERR_NO_VSAFE5V,
1256 PDO_ERR_VSAFE5V_NOT_FIRST,
1257 PDO_ERR_PDO_TYPE_NOT_IN_ORDER,
1258 PDO_ERR_FIXED_NOT_SORTED,
1259 PDO_ERR_VARIABLE_BATT_NOT_SORTED,
1260 PDO_ERR_DUPE_PDO,
1261 };
1262
1263 static const char * const pdo_err_msg[] = {
1264 [PDO_ERR_NO_VSAFE5V] =
1265 " err: source/sink caps should atleast have vSafe5V",
1266 [PDO_ERR_VSAFE5V_NOT_FIRST] =
1267 " err: vSafe5V Fixed Supply Object Shall always be the first object",
1268 [PDO_ERR_PDO_TYPE_NOT_IN_ORDER] =
1269 " err: PDOs should be in the following order: Fixed; Battery; Variable",
1270 [PDO_ERR_FIXED_NOT_SORTED] =
1271 " err: Fixed supply pdos should be in increasing order of their fixed voltage",
1272 [PDO_ERR_VARIABLE_BATT_NOT_SORTED] =
1273 " err: Variable/Battery supply pdos should be in increasing order of their minimum voltage",
1274 [PDO_ERR_DUPE_PDO] =
1275 " err: Variable/Batt supply pdos cannot have same min/max voltage",
1276 };
1277
1278 static enum pdo_err tcpm_caps_err(struct tcpm_port *port, const u32 *pdo,
1279 unsigned int nr_pdo)
1280 {
1281 unsigned int i;
1282
1283 /* Should at least contain vSafe5v */
1284 if (nr_pdo < 1)
1285 return PDO_ERR_NO_VSAFE5V;
1286
1287 /* The vSafe5V Fixed Supply Object Shall always be the first object */
1288 if (pdo_type(pdo[0]) != PDO_TYPE_FIXED ||
1289 pdo_fixed_voltage(pdo[0]) != VSAFE5V)
1290 return PDO_ERR_VSAFE5V_NOT_FIRST;
1291
1292 for (i = 1; i < nr_pdo; i++) {
1293 if (pdo_type(pdo[i]) < pdo_type(pdo[i - 1])) {
1294 return PDO_ERR_PDO_TYPE_NOT_IN_ORDER;
1295 } else if (pdo_type(pdo[i]) == pdo_type(pdo[i - 1])) {
1296 enum pd_pdo_type type = pdo_type(pdo[i]);
1297
1298 switch (type) {
1299 /*
1300 * The remaining Fixed Supply Objects, if
1301 * present, shall be sent in voltage order;
1302 * lowest to highest.
1303 */
1304 case PDO_TYPE_FIXED:
1305 if (pdo_fixed_voltage(pdo[i]) <=
1306 pdo_fixed_voltage(pdo[i - 1]))
1307 return PDO_ERR_FIXED_NOT_SORTED;
1308 break;
1309 /*
1310 * The Battery Supply Objects and Variable
1311 * supply, if present shall be sent in Minimum
1312 * Voltage order; lowest to highest.
1313 */
1314 case PDO_TYPE_VAR:
1315 case PDO_TYPE_BATT:
1316 if (pdo_min_voltage(pdo[i]) <
1317 pdo_min_voltage(pdo[i - 1]))
1318 return PDO_ERR_VARIABLE_BATT_NOT_SORTED;
1319 else if ((pdo_min_voltage(pdo[i]) ==
1320 pdo_min_voltage(pdo[i - 1])) &&
1321 (pdo_max_voltage(pdo[i]) ==
1322 pdo_min_voltage(pdo[i - 1])))
1323 return PDO_ERR_DUPE_PDO;
1324 break;
1325 default:
1326 tcpm_log_force(port, " Unknown pdo type");
1327 }
1328 }
1329 }
1330
1331 return PDO_NO_ERR;
1332 }
1333
1334 static int tcpm_validate_caps(struct tcpm_port *port, const u32 *pdo,
1335 unsigned int nr_pdo)
1336 {
1337 enum pdo_err err_index = tcpm_caps_err(port, pdo, nr_pdo);
1338
1339 if (err_index != PDO_NO_ERR) {
1340 tcpm_log_force(port, " %s", pdo_err_msg[err_index]);
1341 return -EINVAL;
1342 }
1343
1344 return 0;
1345 }
1346
1347 /*
1348 * PD (data, control) command handling functions
1349 */
1350 static void tcpm_pd_data_request(struct tcpm_port *port,
1351 const struct pd_message *msg)
1352 {
1353 enum pd_data_msg_type type = pd_header_type_le(msg->header);
1354 unsigned int cnt = pd_header_cnt_le(msg->header);
1355 unsigned int i;
1356
1357 switch (type) {
1358 case PD_DATA_SOURCE_CAP:
1359 if (port->pwr_role != TYPEC_SINK)
1360 break;
1361
1362 for (i = 0; i < cnt; i++)
1363 port->source_caps[i] = le32_to_cpu(msg->payload[i]);
1364
1365 port->nr_source_caps = cnt;
1366
1367 tcpm_log_source_caps(port);
1368
1369 tcpm_validate_caps(port, port->source_caps,
1370 port->nr_source_caps);
1371
1372 /*
1373 * This message may be received even if VBUS is not
1374 * present. This is quite unexpected; see USB PD
1375 * specification, sections 8.3.3.6.3.1 and 8.3.3.6.3.2.
1376 * However, at the same time, we must be ready to
1377 * receive this message and respond to it 15ms after
1378 * receiving PS_RDY during power swap operations, no matter
1379 * if VBUS is available or not (USB PD specification,
1380 * section 6.5.9.2).
1381 * So we need to accept the message either way,
1382 * but be prepared to keep waiting for VBUS after it was
1383 * handled.
1384 */
1385 tcpm_set_state(port, SNK_NEGOTIATE_CAPABILITIES, 0);
1386 break;
1387 case PD_DATA_REQUEST:
1388 if (port->pwr_role != TYPEC_SOURCE ||
1389 cnt != 1) {
1390 tcpm_queue_message(port, PD_MSG_CTRL_REJECT);
1391 break;
1392 }
1393 port->sink_request = le32_to_cpu(msg->payload[0]);
1394 tcpm_set_state(port, SRC_NEGOTIATE_CAPABILITIES, 0);
1395 break;
1396 case PD_DATA_SINK_CAP:
1397 /* We don't do anything with this at the moment... */
1398 for (i = 0; i < cnt; i++)
1399 port->sink_caps[i] = le32_to_cpu(msg->payload[i]);
1400 port->nr_sink_caps = cnt;
1401 break;
1402 case PD_DATA_VENDOR_DEF:
1403 tcpm_handle_vdm_request(port, msg->payload, cnt);
1404 break;
1405 case PD_DATA_BIST:
1406 if (port->state == SRC_READY || port->state == SNK_READY) {
1407 port->bist_request = le32_to_cpu(msg->payload[0]);
1408 tcpm_set_state(port, BIST_RX, 0);
1409 }
1410 break;
1411 default:
1412 tcpm_log(port, "Unhandled data message type %#x", type);
1413 break;
1414 }
1415 }
1416
1417 static void tcpm_pd_ctrl_request(struct tcpm_port *port,
1418 const struct pd_message *msg)
1419 {
1420 enum pd_ctrl_msg_type type = pd_header_type_le(msg->header);
1421 enum tcpm_state next_state;
1422
1423 switch (type) {
1424 case PD_CTRL_GOOD_CRC:
1425 case PD_CTRL_PING:
1426 break;
1427 case PD_CTRL_GET_SOURCE_CAP:
1428 switch (port->state) {
1429 case SRC_READY:
1430 case SNK_READY:
1431 tcpm_queue_message(port, PD_MSG_DATA_SOURCE_CAP);
1432 break;
1433 default:
1434 tcpm_queue_message(port, PD_MSG_CTRL_REJECT);
1435 break;
1436 }
1437 break;
1438 case PD_CTRL_GET_SINK_CAP:
1439 switch (port->state) {
1440 case SRC_READY:
1441 case SNK_READY:
1442 tcpm_queue_message(port, PD_MSG_DATA_SINK_CAP);
1443 break;
1444 default:
1445 tcpm_queue_message(port, PD_MSG_CTRL_REJECT);
1446 break;
1447 }
1448 break;
1449 case PD_CTRL_GOTO_MIN:
1450 break;
1451 case PD_CTRL_PS_RDY:
1452 switch (port->state) {
1453 case SNK_TRANSITION_SINK:
1454 if (port->vbus_present) {
1455 tcpm_set_current_limit(port,
1456 port->current_limit,
1457 port->supply_voltage);
1458 port->explicit_contract = true;
1459 tcpm_set_state(port, SNK_READY, 0);
1460 } else {
1461 /*
1462 * Seen after power swap. Keep waiting for VBUS
1463 * in a transitional state.
1464 */
1465 tcpm_set_state(port,
1466 SNK_TRANSITION_SINK_VBUS, 0);
1467 }
1468 break;
1469 case PR_SWAP_SRC_SNK_SOURCE_OFF_CC_DEBOUNCED:
1470 tcpm_set_state(port, PR_SWAP_SRC_SNK_SINK_ON, 0);
1471 break;
1472 case PR_SWAP_SNK_SRC_SINK_OFF:
1473 tcpm_set_state(port, PR_SWAP_SNK_SRC_SOURCE_ON, 0);
1474 break;
1475 case VCONN_SWAP_WAIT_FOR_VCONN:
1476 tcpm_set_state(port, VCONN_SWAP_TURN_OFF_VCONN, 0);
1477 break;
1478 default:
1479 break;
1480 }
1481 break;
1482 case PD_CTRL_REJECT:
1483 case PD_CTRL_WAIT:
1484 switch (port->state) {
1485 case SNK_NEGOTIATE_CAPABILITIES:
1486 /* USB PD specification, Figure 8-43 */
1487 if (port->explicit_contract)
1488 next_state = SNK_READY;
1489 else
1490 next_state = SNK_WAIT_CAPABILITIES;
1491 tcpm_set_state(port, next_state, 0);
1492 break;
1493 case DR_SWAP_SEND:
1494 port->swap_status = (type == PD_CTRL_WAIT ?
1495 -EAGAIN : -EOPNOTSUPP);
1496 tcpm_set_state(port, DR_SWAP_CANCEL, 0);
1497 break;
1498 case PR_SWAP_SEND:
1499 port->swap_status = (type == PD_CTRL_WAIT ?
1500 -EAGAIN : -EOPNOTSUPP);
1501 tcpm_set_state(port, PR_SWAP_CANCEL, 0);
1502 break;
1503 case VCONN_SWAP_SEND:
1504 port->swap_status = (type == PD_CTRL_WAIT ?
1505 -EAGAIN : -EOPNOTSUPP);
1506 tcpm_set_state(port, VCONN_SWAP_CANCEL, 0);
1507 break;
1508 default:
1509 break;
1510 }
1511 break;
1512 case PD_CTRL_ACCEPT:
1513 switch (port->state) {
1514 case SNK_NEGOTIATE_CAPABILITIES:
1515 tcpm_set_state(port, SNK_TRANSITION_SINK, 0);
1516 break;
1517 case SOFT_RESET_SEND:
1518 port->message_id = 0;
1519 port->rx_msgid = -1;
1520 if (port->pwr_role == TYPEC_SOURCE)
1521 next_state = SRC_SEND_CAPABILITIES;
1522 else
1523 next_state = SNK_WAIT_CAPABILITIES;
1524 tcpm_set_state(port, next_state, 0);
1525 break;
1526 case DR_SWAP_SEND:
1527 tcpm_set_state(port, DR_SWAP_CHANGE_DR, 0);
1528 break;
1529 case PR_SWAP_SEND:
1530 tcpm_set_state(port, PR_SWAP_START, 0);
1531 break;
1532 case VCONN_SWAP_SEND:
1533 tcpm_set_state(port, VCONN_SWAP_START, 0);
1534 break;
1535 default:
1536 break;
1537 }
1538 break;
1539 case PD_CTRL_SOFT_RESET:
1540 tcpm_set_state(port, SOFT_RESET, 0);
1541 break;
1542 case PD_CTRL_DR_SWAP:
1543 if (port->port_type != TYPEC_PORT_DRP) {
1544 tcpm_queue_message(port, PD_MSG_CTRL_REJECT);
1545 break;
1546 }
1547 /*
1548 * XXX
1549 * 6.3.9: If an alternate mode is active, a request to swap
1550 * alternate modes shall trigger a port reset.
1551 */
1552 switch (port->state) {
1553 case SRC_READY:
1554 case SNK_READY:
1555 tcpm_set_state(port, DR_SWAP_ACCEPT, 0);
1556 break;
1557 default:
1558 tcpm_queue_message(port, PD_MSG_CTRL_WAIT);
1559 break;
1560 }
1561 break;
1562 case PD_CTRL_PR_SWAP:
1563 if (port->port_type != TYPEC_PORT_DRP) {
1564 tcpm_queue_message(port, PD_MSG_CTRL_REJECT);
1565 break;
1566 }
1567 switch (port->state) {
1568 case SRC_READY:
1569 case SNK_READY:
1570 tcpm_set_state(port, PR_SWAP_ACCEPT, 0);
1571 break;
1572 default:
1573 tcpm_queue_message(port, PD_MSG_CTRL_WAIT);
1574 break;
1575 }
1576 break;
1577 case PD_CTRL_VCONN_SWAP:
1578 switch (port->state) {
1579 case SRC_READY:
1580 case SNK_READY:
1581 tcpm_set_state(port, VCONN_SWAP_ACCEPT, 0);
1582 break;
1583 default:
1584 tcpm_queue_message(port, PD_MSG_CTRL_WAIT);
1585 break;
1586 }
1587 break;
1588 default:
1589 tcpm_log(port, "Unhandled ctrl message type %#x", type);
1590 break;
1591 }
1592 }
1593
1594 static void tcpm_pd_rx_handler(struct work_struct *work)
1595 {
1596 struct pd_rx_event *event = container_of(work,
1597 struct pd_rx_event, work);
1598 const struct pd_message *msg = &event->msg;
1599 unsigned int cnt = pd_header_cnt_le(msg->header);
1600 struct tcpm_port *port = event->port;
1601
1602 mutex_lock(&port->lock);
1603
1604 tcpm_log(port, "PD RX, header: %#x [%d]", le16_to_cpu(msg->header),
1605 port->attached);
1606
1607 if (port->attached) {
1608 enum pd_ctrl_msg_type type = pd_header_type_le(msg->header);
1609 unsigned int msgid = pd_header_msgid_le(msg->header);
1610
1611 /*
1612 * USB PD standard, 6.6.1.2:
1613 * "... if MessageID value in a received Message is the
1614 * same as the stored value, the receiver shall return a
1615 * GoodCRC Message with that MessageID value and drop
1616 * the Message (this is a retry of an already received
1617 * Message). Note: this shall not apply to the Soft_Reset
1618 * Message which always has a MessageID value of zero."
1619 */
1620 if (msgid == port->rx_msgid && type != PD_CTRL_SOFT_RESET)
1621 goto done;
1622 port->rx_msgid = msgid;
1623
1624 /*
1625 * If both ends believe to be DFP/host, we have a data role
1626 * mismatch.
1627 */
1628 if (!!(le16_to_cpu(msg->header) & PD_HEADER_DATA_ROLE) ==
1629 (port->data_role == TYPEC_HOST)) {
1630 tcpm_log(port,
1631 "Data role mismatch, initiating error recovery");
1632 tcpm_set_state(port, ERROR_RECOVERY, 0);
1633 } else {
1634 if (cnt)
1635 tcpm_pd_data_request(port, msg);
1636 else
1637 tcpm_pd_ctrl_request(port, msg);
1638 }
1639 }
1640
1641 done:
1642 mutex_unlock(&port->lock);
1643 kfree(event);
1644 }
1645
1646 void tcpm_pd_receive(struct tcpm_port *port, const struct pd_message *msg)
1647 {
1648 struct pd_rx_event *event;
1649
1650 event = kzalloc(sizeof(*event), GFP_ATOMIC);
1651 if (!event)
1652 return;
1653
1654 INIT_WORK(&event->work, tcpm_pd_rx_handler);
1655 event->port = port;
1656 memcpy(&event->msg, msg, sizeof(*msg));
1657 queue_work(port->wq, &event->work);
1658 }
1659 EXPORT_SYMBOL_GPL(tcpm_pd_receive);
1660
1661 static int tcpm_pd_send_control(struct tcpm_port *port,
1662 enum pd_ctrl_msg_type type)
1663 {
1664 struct pd_message msg;
1665
1666 memset(&msg, 0, sizeof(msg));
1667 msg.header = PD_HEADER_LE(type, port->pwr_role,
1668 port->data_role,
1669 port->message_id, 0);
1670
1671 return tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
1672 }
1673
1674 /*
1675 * Send queued message without affecting state.
1676 * Return true if state machine should go back to sleep,
1677 * false otherwise.
1678 */
1679 static bool tcpm_send_queued_message(struct tcpm_port *port)
1680 {
1681 enum pd_msg_request queued_message;
1682
1683 do {
1684 queued_message = port->queued_message;
1685 port->queued_message = PD_MSG_NONE;
1686
1687 switch (queued_message) {
1688 case PD_MSG_CTRL_WAIT:
1689 tcpm_pd_send_control(port, PD_CTRL_WAIT);
1690 break;
1691 case PD_MSG_CTRL_REJECT:
1692 tcpm_pd_send_control(port, PD_CTRL_REJECT);
1693 break;
1694 case PD_MSG_DATA_SINK_CAP:
1695 tcpm_pd_send_sink_caps(port);
1696 break;
1697 case PD_MSG_DATA_SOURCE_CAP:
1698 tcpm_pd_send_source_caps(port);
1699 break;
1700 default:
1701 break;
1702 }
1703 } while (port->queued_message != PD_MSG_NONE);
1704
1705 if (port->delayed_state != INVALID_STATE) {
1706 if (time_is_after_jiffies(port->delayed_runtime)) {
1707 mod_delayed_work(port->wq, &port->state_machine,
1708 port->delayed_runtime - jiffies);
1709 return true;
1710 }
1711 port->delayed_state = INVALID_STATE;
1712 }
1713 return false;
1714 }
1715
1716 static int tcpm_pd_check_request(struct tcpm_port *port)
1717 {
1718 u32 pdo, rdo = port->sink_request;
1719 unsigned int max, op, pdo_max, index;
1720 enum pd_pdo_type type;
1721
1722 index = rdo_index(rdo);
1723 if (!index || index > port->nr_src_pdo)
1724 return -EINVAL;
1725
1726 pdo = port->src_pdo[index - 1];
1727 type = pdo_type(pdo);
1728 switch (type) {
1729 case PDO_TYPE_FIXED:
1730 case PDO_TYPE_VAR:
1731 max = rdo_max_current(rdo);
1732 op = rdo_op_current(rdo);
1733 pdo_max = pdo_max_current(pdo);
1734
1735 if (op > pdo_max)
1736 return -EINVAL;
1737 if (max > pdo_max && !(rdo & RDO_CAP_MISMATCH))
1738 return -EINVAL;
1739
1740 if (type == PDO_TYPE_FIXED)
1741 tcpm_log(port,
1742 "Requested %u mV, %u mA for %u / %u mA",
1743 pdo_fixed_voltage(pdo), pdo_max, op, max);
1744 else
1745 tcpm_log(port,
1746 "Requested %u -> %u mV, %u mA for %u / %u mA",
1747 pdo_min_voltage(pdo), pdo_max_voltage(pdo),
1748 pdo_max, op, max);
1749 break;
1750 case PDO_TYPE_BATT:
1751 max = rdo_max_power(rdo);
1752 op = rdo_op_power(rdo);
1753 pdo_max = pdo_max_power(pdo);
1754
1755 if (op > pdo_max)
1756 return -EINVAL;
1757 if (max > pdo_max && !(rdo & RDO_CAP_MISMATCH))
1758 return -EINVAL;
1759 tcpm_log(port,
1760 "Requested %u -> %u mV, %u mW for %u / %u mW",
1761 pdo_min_voltage(pdo), pdo_max_voltage(pdo),
1762 pdo_max, op, max);
1763 break;
1764 default:
1765 return -EINVAL;
1766 }
1767
1768 port->op_vsafe5v = index == 1;
1769
1770 return 0;
1771 }
1772
1773 #define min_power(x, y) min(pdo_max_power(x), pdo_max_power(y))
1774 #define min_current(x, y) min(pdo_max_current(x), pdo_max_current(y))
1775
1776 static int tcpm_pd_select_pdo(struct tcpm_port *port, int *sink_pdo,
1777 int *src_pdo)
1778 {
1779 unsigned int i, j, max_mw = 0, max_mv = 0, mw = 0, mv = 0, ma = 0;
1780 int ret = -EINVAL;
1781
1782 /*
1783 * Select the source PDO providing the most power which has a
1784 * matchig sink cap.
1785 */
1786 for (i = 0; i < port->nr_source_caps; i++) {
1787 u32 pdo = port->source_caps[i];
1788 enum pd_pdo_type type = pdo_type(pdo);
1789
1790 if (type == PDO_TYPE_FIXED) {
1791 for (j = 0; j < port->nr_fixed; j++) {
1792 if (pdo_fixed_voltage(pdo) ==
1793 pdo_fixed_voltage(port->snk_pdo[j])) {
1794 ma = min_current(pdo, port->snk_pdo[j]);
1795 mv = pdo_fixed_voltage(pdo);
1796 mw = ma * mv / 1000;
1797 if (mw > max_mw ||
1798 (mw == max_mw && mv > max_mv)) {
1799 ret = 0;
1800 *src_pdo = i;
1801 *sink_pdo = j;
1802 max_mw = mw;
1803 max_mv = mv;
1804 }
1805 /* There could only be one fixed pdo
1806 * at a specific voltage level.
1807 * So breaking here.
1808 */
1809 break;
1810 }
1811 }
1812 } else if (type == PDO_TYPE_BATT) {
1813 for (j = port->nr_fixed;
1814 j < port->nr_fixed +
1815 port->nr_batt;
1816 j++) {
1817 if (pdo_min_voltage(pdo) >=
1818 pdo_min_voltage(port->snk_pdo[j]) &&
1819 pdo_max_voltage(pdo) <=
1820 pdo_max_voltage(port->snk_pdo[j])) {
1821 mw = min_power(pdo, port->snk_pdo[j]);
1822 mv = pdo_min_voltage(pdo);
1823 if (mw > max_mw ||
1824 (mw == max_mw && mv > max_mv)) {
1825 ret = 0;
1826 *src_pdo = i;
1827 *sink_pdo = j;
1828 max_mw = mw;
1829 max_mv = mv;
1830 }
1831 }
1832 }
1833 } else if (type == PDO_TYPE_VAR) {
1834 for (j = port->nr_fixed +
1835 port->nr_batt;
1836 j < port->nr_fixed +
1837 port->nr_batt +
1838 port->nr_var;
1839 j++) {
1840 if (pdo_min_voltage(pdo) >=
1841 pdo_min_voltage(port->snk_pdo[j]) &&
1842 pdo_max_voltage(pdo) <=
1843 pdo_max_voltage(port->snk_pdo[j])) {
1844 ma = min_current(pdo, port->snk_pdo[j]);
1845 mv = pdo_min_voltage(pdo);
1846 mw = ma * mv / 1000;
1847 if (mw > max_mw ||
1848 (mw == max_mw && mv > max_mv)) {
1849 ret = 0;
1850 *src_pdo = i;
1851 *sink_pdo = j;
1852 max_mw = mw;
1853 max_mv = mv;
1854 }
1855 }
1856 }
1857 }
1858 }
1859
1860 return ret;
1861 }
1862
1863 static int tcpm_pd_build_request(struct tcpm_port *port, u32 *rdo)
1864 {
1865 unsigned int mv, ma, mw, flags;
1866 unsigned int max_ma, max_mw;
1867 enum pd_pdo_type type;
1868 int src_pdo_index, snk_pdo_index;
1869 u32 pdo, matching_snk_pdo;
1870
1871 if (tcpm_pd_select_pdo(port, &snk_pdo_index, &src_pdo_index) < 0)
1872 return -EINVAL;
1873
1874 pdo = port->source_caps[src_pdo_index];
1875 matching_snk_pdo = port->snk_pdo[snk_pdo_index];
1876 type = pdo_type(pdo);
1877
1878 if (type == PDO_TYPE_FIXED)
1879 mv = pdo_fixed_voltage(pdo);
1880 else
1881 mv = pdo_min_voltage(pdo);
1882
1883 /* Select maximum available current within the sink pdo's limit */
1884 if (type == PDO_TYPE_BATT) {
1885 mw = min_power(pdo, matching_snk_pdo);
1886 ma = 1000 * mw / mv;
1887 } else {
1888 ma = min_current(pdo, matching_snk_pdo);
1889 mw = ma * mv / 1000;
1890 }
1891
1892 flags = RDO_USB_COMM | RDO_NO_SUSPEND;
1893
1894 /* Set mismatch bit if offered power is less than operating power */
1895 max_ma = ma;
1896 max_mw = mw;
1897 if (mw < port->operating_snk_mw) {
1898 flags |= RDO_CAP_MISMATCH;
1899 if (type == PDO_TYPE_BATT &&
1900 (pdo_max_power(matching_snk_pdo) > pdo_max_power(pdo)))
1901 max_mw = pdo_max_power(matching_snk_pdo);
1902 else if (pdo_max_current(matching_snk_pdo) >
1903 pdo_max_current(pdo))
1904 max_ma = pdo_max_current(matching_snk_pdo);
1905 }
1906
1907 tcpm_log(port, "cc=%d cc1=%d cc2=%d vbus=%d vconn=%s polarity=%d",
1908 port->cc_req, port->cc1, port->cc2, port->vbus_source,
1909 port->vconn_role == TYPEC_SOURCE ? "source" : "sink",
1910 port->polarity);
1911
1912 if (type == PDO_TYPE_BATT) {
1913 *rdo = RDO_BATT(src_pdo_index + 1, mw, max_mw, flags);
1914
1915 tcpm_log(port, "Requesting PDO %d: %u mV, %u mW%s",
1916 src_pdo_index, mv, mw,
1917 flags & RDO_CAP_MISMATCH ? " [mismatch]" : "");
1918 } else {
1919 *rdo = RDO_FIXED(src_pdo_index + 1, ma, max_ma, flags);
1920
1921 tcpm_log(port, "Requesting PDO %d: %u mV, %u mA%s",
1922 src_pdo_index, mv, ma,
1923 flags & RDO_CAP_MISMATCH ? " [mismatch]" : "");
1924 }
1925
1926 port->current_limit = ma;
1927 port->supply_voltage = mv;
1928
1929 return 0;
1930 }
1931
1932 static int tcpm_pd_send_request(struct tcpm_port *port)
1933 {
1934 struct pd_message msg;
1935 int ret;
1936 u32 rdo;
1937
1938 ret = tcpm_pd_build_request(port, &rdo);
1939 if (ret < 0)
1940 return ret;
1941
1942 memset(&msg, 0, sizeof(msg));
1943 msg.header = PD_HEADER_LE(PD_DATA_REQUEST,
1944 port->pwr_role,
1945 port->data_role,
1946 port->message_id, 1);
1947 msg.payload[0] = cpu_to_le32(rdo);
1948
1949 return tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
1950 }
1951
1952 static int tcpm_set_vbus(struct tcpm_port *port, bool enable)
1953 {
1954 int ret;
1955
1956 if (enable && port->vbus_charge)
1957 return -EINVAL;
1958
1959 tcpm_log(port, "vbus:=%d charge=%d", enable, port->vbus_charge);
1960
1961 ret = port->tcpc->set_vbus(port->tcpc, enable, port->vbus_charge);
1962 if (ret < 0)
1963 return ret;
1964
1965 port->vbus_source = enable;
1966 return 0;
1967 }
1968
1969 static int tcpm_set_charge(struct tcpm_port *port, bool charge)
1970 {
1971 int ret;
1972
1973 if (charge && port->vbus_source)
1974 return -EINVAL;
1975
1976 if (charge != port->vbus_charge) {
1977 tcpm_log(port, "vbus=%d charge:=%d", port->vbus_source, charge);
1978 ret = port->tcpc->set_vbus(port->tcpc, port->vbus_source,
1979 charge);
1980 if (ret < 0)
1981 return ret;
1982 }
1983 port->vbus_charge = charge;
1984 return 0;
1985 }
1986
1987 static bool tcpm_start_drp_toggling(struct tcpm_port *port)
1988 {
1989 int ret;
1990
1991 if (port->tcpc->start_drp_toggling &&
1992 port->port_type == TYPEC_PORT_DRP) {
1993 tcpm_log_force(port, "Start DRP toggling");
1994 ret = port->tcpc->start_drp_toggling(port->tcpc,
1995 tcpm_rp_cc(port));
1996 if (!ret)
1997 return true;
1998 }
1999
2000 return false;
2001 }
2002
2003 static void tcpm_set_cc(struct tcpm_port *port, enum typec_cc_status cc)
2004 {
2005 tcpm_log(port, "cc:=%d", cc);
2006 port->cc_req = cc;
2007 port->tcpc->set_cc(port->tcpc, cc);
2008 }
2009
2010 static int tcpm_init_vbus(struct tcpm_port *port)
2011 {
2012 int ret;
2013
2014 ret = port->tcpc->set_vbus(port->tcpc, false, false);
2015 port->vbus_source = false;
2016 port->vbus_charge = false;
2017 return ret;
2018 }
2019
2020 static int tcpm_init_vconn(struct tcpm_port *port)
2021 {
2022 int ret;
2023
2024 ret = port->tcpc->set_vconn(port->tcpc, false);
2025 port->vconn_role = TYPEC_SINK;
2026 return ret;
2027 }
2028
2029 static void tcpm_typec_connect(struct tcpm_port *port)
2030 {
2031 if (!port->connected) {
2032 /* Make sure we don't report stale identity information */
2033 memset(&port->partner_ident, 0, sizeof(port->partner_ident));
2034 port->partner_desc.usb_pd = port->pd_capable;
2035 if (tcpm_port_is_debug(port))
2036 port->partner_desc.accessory = TYPEC_ACCESSORY_DEBUG;
2037 else if (tcpm_port_is_audio(port))
2038 port->partner_desc.accessory = TYPEC_ACCESSORY_AUDIO;
2039 else
2040 port->partner_desc.accessory = TYPEC_ACCESSORY_NONE;
2041 port->partner = typec_register_partner(port->typec_port,
2042 &port->partner_desc);
2043 port->connected = true;
2044 }
2045 }
2046
2047 static int tcpm_src_attach(struct tcpm_port *port)
2048 {
2049 enum typec_cc_polarity polarity =
2050 port->cc2 == TYPEC_CC_RD ? TYPEC_POLARITY_CC2
2051 : TYPEC_POLARITY_CC1;
2052 int ret;
2053
2054 if (port->attached)
2055 return 0;
2056
2057 ret = tcpm_set_polarity(port, polarity);
2058 if (ret < 0)
2059 return ret;
2060
2061 ret = tcpm_set_roles(port, true, TYPEC_SOURCE, TYPEC_HOST);
2062 if (ret < 0)
2063 return ret;
2064
2065 ret = port->tcpc->set_pd_rx(port->tcpc, true);
2066 if (ret < 0)
2067 goto out_disable_mux;
2068
2069 /*
2070 * USB Type-C specification, version 1.2,
2071 * chapter 4.5.2.2.8.1 (Attached.SRC Requirements)
2072 * Enable VCONN only if the non-RD port is set to RA.
2073 */
2074 if ((polarity == TYPEC_POLARITY_CC1 && port->cc2 == TYPEC_CC_RA) ||
2075 (polarity == TYPEC_POLARITY_CC2 && port->cc1 == TYPEC_CC_RA)) {
2076 ret = tcpm_set_vconn(port, true);
2077 if (ret < 0)
2078 goto out_disable_pd;
2079 }
2080
2081 ret = tcpm_set_vbus(port, true);
2082 if (ret < 0)
2083 goto out_disable_vconn;
2084
2085 port->pd_capable = false;
2086
2087 port->partner = NULL;
2088
2089 port->attached = true;
2090 port->send_discover = true;
2091
2092 return 0;
2093
2094 out_disable_vconn:
2095 tcpm_set_vconn(port, false);
2096 out_disable_pd:
2097 port->tcpc->set_pd_rx(port->tcpc, false);
2098 out_disable_mux:
2099 tcpm_mux_set(port, TYPEC_MUX_NONE, TCPC_USB_SWITCH_DISCONNECT);
2100 return ret;
2101 }
2102
2103 static void tcpm_typec_disconnect(struct tcpm_port *port)
2104 {
2105 if (port->connected) {
2106 typec_unregister_partner(port->partner);
2107 port->partner = NULL;
2108 port->connected = false;
2109 }
2110 }
2111
2112 static void tcpm_unregister_altmodes(struct tcpm_port *port)
2113 {
2114 struct pd_mode_data *modep = &port->mode_data;
2115 int i;
2116
2117 for (i = 0; i < modep->altmodes; i++) {
2118 typec_unregister_altmode(port->partner_altmode[i]);
2119 port->partner_altmode[i] = NULL;
2120 }
2121
2122 memset(modep, 0, sizeof(*modep));
2123 }
2124
2125 static void tcpm_reset_port(struct tcpm_port *port)
2126 {
2127 tcpm_unregister_altmodes(port);
2128 tcpm_typec_disconnect(port);
2129 port->attached = false;
2130 port->pd_capable = false;
2131
2132 /*
2133 * First Rx ID should be 0; set this to a sentinel of -1 so that
2134 * we can check tcpm_pd_rx_handler() if we had seen it before.
2135 */
2136 port->rx_msgid = -1;
2137
2138 port->tcpc->set_pd_rx(port->tcpc, false);
2139 tcpm_init_vbus(port); /* also disables charging */
2140 tcpm_init_vconn(port);
2141 tcpm_set_current_limit(port, 0, 0);
2142 tcpm_set_polarity(port, TYPEC_POLARITY_CC1);
2143 tcpm_set_attached_state(port, false);
2144 port->try_src_count = 0;
2145 port->try_snk_count = 0;
2146 }
2147
2148 static void tcpm_detach(struct tcpm_port *port)
2149 {
2150 if (!port->attached)
2151 return;
2152
2153 if (tcpm_port_is_disconnected(port))
2154 port->hard_reset_count = 0;
2155
2156 tcpm_reset_port(port);
2157 }
2158
2159 static void tcpm_src_detach(struct tcpm_port *port)
2160 {
2161 tcpm_detach(port);
2162 }
2163
2164 static int tcpm_snk_attach(struct tcpm_port *port)
2165 {
2166 int ret;
2167
2168 if (port->attached)
2169 return 0;
2170
2171 ret = tcpm_set_polarity(port, port->cc2 != TYPEC_CC_OPEN ?
2172 TYPEC_POLARITY_CC2 : TYPEC_POLARITY_CC1);
2173 if (ret < 0)
2174 return ret;
2175
2176 ret = tcpm_set_roles(port, true, TYPEC_SINK, TYPEC_DEVICE);
2177 if (ret < 0)
2178 return ret;
2179
2180 port->pd_capable = false;
2181
2182 port->partner = NULL;
2183
2184 port->attached = true;
2185 port->send_discover = true;
2186
2187 return 0;
2188 }
2189
2190 static void tcpm_snk_detach(struct tcpm_port *port)
2191 {
2192 tcpm_detach(port);
2193
2194 /* XXX: (Dis)connect SuperSpeed mux? */
2195 }
2196
2197 static int tcpm_acc_attach(struct tcpm_port *port)
2198 {
2199 int ret;
2200
2201 if (port->attached)
2202 return 0;
2203
2204 ret = tcpm_set_roles(port, true, TYPEC_SOURCE, TYPEC_HOST);
2205 if (ret < 0)
2206 return ret;
2207
2208 port->partner = NULL;
2209
2210 tcpm_typec_connect(port);
2211
2212 port->attached = true;
2213
2214 return 0;
2215 }
2216
2217 static void tcpm_acc_detach(struct tcpm_port *port)
2218 {
2219 tcpm_detach(port);
2220 }
2221
2222 static inline enum tcpm_state hard_reset_state(struct tcpm_port *port)
2223 {
2224 if (port->hard_reset_count < PD_N_HARD_RESET_COUNT)
2225 return HARD_RESET_SEND;
2226 if (port->pd_capable)
2227 return ERROR_RECOVERY;
2228 if (port->pwr_role == TYPEC_SOURCE)
2229 return SRC_UNATTACHED;
2230 if (port->state == SNK_WAIT_CAPABILITIES)
2231 return SNK_READY;
2232 return SNK_UNATTACHED;
2233 }
2234
2235 static inline enum tcpm_state ready_state(struct tcpm_port *port)
2236 {
2237 if (port->pwr_role == TYPEC_SOURCE)
2238 return SRC_READY;
2239 else
2240 return SNK_READY;
2241 }
2242
2243 static inline enum tcpm_state unattached_state(struct tcpm_port *port)
2244 {
2245 if (port->port_type == TYPEC_PORT_DRP) {
2246 if (port->pwr_role == TYPEC_SOURCE)
2247 return SRC_UNATTACHED;
2248 else
2249 return SNK_UNATTACHED;
2250 } else if (port->port_type == TYPEC_PORT_DFP) {
2251 return SRC_UNATTACHED;
2252 }
2253
2254 return SNK_UNATTACHED;
2255 }
2256
2257 static void tcpm_check_send_discover(struct tcpm_port *port)
2258 {
2259 if (port->data_role == TYPEC_HOST && port->send_discover &&
2260 port->pd_capable) {
2261 tcpm_send_vdm(port, USB_SID_PD, CMD_DISCOVER_IDENT, NULL, 0);
2262 port->send_discover = false;
2263 }
2264 }
2265
2266 static void tcpm_swap_complete(struct tcpm_port *port, int result)
2267 {
2268 if (port->swap_pending) {
2269 port->swap_status = result;
2270 port->swap_pending = false;
2271 port->non_pd_role_swap = false;
2272 complete(&port->swap_complete);
2273 }
2274 }
2275
2276 static enum typec_pwr_opmode tcpm_get_pwr_opmode(enum typec_cc_status cc)
2277 {
2278 switch (cc) {
2279 case TYPEC_CC_RP_1_5:
2280 return TYPEC_PWR_MODE_1_5A;
2281 case TYPEC_CC_RP_3_0:
2282 return TYPEC_PWR_MODE_3_0A;
2283 case TYPEC_CC_RP_DEF:
2284 default:
2285 return TYPEC_PWR_MODE_USB;
2286 }
2287 }
2288
2289 static void run_state_machine(struct tcpm_port *port)
2290 {
2291 int ret;
2292 enum typec_pwr_opmode opmode;
2293 unsigned int msecs;
2294
2295 port->enter_state = port->state;
2296 switch (port->state) {
2297 case DRP_TOGGLING:
2298 break;
2299 /* SRC states */
2300 case SRC_UNATTACHED:
2301 if (!port->non_pd_role_swap)
2302 tcpm_swap_complete(port, -ENOTCONN);
2303 tcpm_src_detach(port);
2304 if (tcpm_start_drp_toggling(port)) {
2305 tcpm_set_state(port, DRP_TOGGLING, 0);
2306 break;
2307 }
2308 tcpm_set_cc(port, tcpm_rp_cc(port));
2309 if (port->port_type == TYPEC_PORT_DRP)
2310 tcpm_set_state(port, SNK_UNATTACHED, PD_T_DRP_SNK);
2311 break;
2312 case SRC_ATTACH_WAIT:
2313 if (tcpm_port_is_debug(port))
2314 tcpm_set_state(port, DEBUG_ACC_ATTACHED,
2315 PD_T_CC_DEBOUNCE);
2316 else if (tcpm_port_is_audio(port))
2317 tcpm_set_state(port, AUDIO_ACC_ATTACHED,
2318 PD_T_CC_DEBOUNCE);
2319 else if (tcpm_port_is_source(port))
2320 tcpm_set_state(port,
2321 tcpm_try_snk(port) ? SNK_TRY
2322 : SRC_ATTACHED,
2323 PD_T_CC_DEBOUNCE);
2324 break;
2325
2326 case SNK_TRY:
2327 port->try_snk_count++;
2328 /*
2329 * Requirements:
2330 * - Do not drive vconn or vbus
2331 * - Terminate CC pins (both) to Rd
2332 * Action:
2333 * - Wait for tDRPTry (PD_T_DRP_TRY).
2334 * Until then, ignore any state changes.
2335 */
2336 tcpm_set_cc(port, TYPEC_CC_RD);
2337 tcpm_set_state(port, SNK_TRY_WAIT, PD_T_DRP_TRY);
2338 break;
2339 case SNK_TRY_WAIT:
2340 if (tcpm_port_is_sink(port)) {
2341 tcpm_set_state(port, SNK_TRY_WAIT_DEBOUNCE, 0);
2342 } else {
2343 tcpm_set_state(port, SRC_TRYWAIT, 0);
2344 port->max_wait = 0;
2345 }
2346 break;
2347 case SNK_TRY_WAIT_DEBOUNCE:
2348 tcpm_set_state(port, SNK_TRY_WAIT_DEBOUNCE_CHECK_VBUS,
2349 PD_T_PD_DEBOUNCE);
2350 break;
2351 case SNK_TRY_WAIT_DEBOUNCE_CHECK_VBUS:
2352 if (port->vbus_present && tcpm_port_is_sink(port)) {
2353 tcpm_set_state(port, SNK_ATTACHED, 0);
2354 } else {
2355 tcpm_set_state(port, SRC_TRYWAIT, 0);
2356 port->max_wait = 0;
2357 }
2358 break;
2359 case SRC_TRYWAIT:
2360 tcpm_set_cc(port, tcpm_rp_cc(port));
2361 if (port->max_wait == 0) {
2362 port->max_wait = jiffies +
2363 msecs_to_jiffies(PD_T_DRP_TRY);
2364 tcpm_set_state(port, SRC_TRYWAIT_UNATTACHED,
2365 PD_T_DRP_TRY);
2366 } else {
2367 if (time_is_after_jiffies(port->max_wait))
2368 tcpm_set_state(port, SRC_TRYWAIT_UNATTACHED,
2369 jiffies_to_msecs(port->max_wait -
2370 jiffies));
2371 else
2372 tcpm_set_state(port, SNK_UNATTACHED, 0);
2373 }
2374 break;
2375 case SRC_TRYWAIT_DEBOUNCE:
2376 tcpm_set_state(port, SRC_ATTACHED, PD_T_CC_DEBOUNCE);
2377 break;
2378 case SRC_TRYWAIT_UNATTACHED:
2379 tcpm_set_state(port, SNK_UNATTACHED, 0);
2380 break;
2381
2382 case SRC_ATTACHED:
2383 ret = tcpm_src_attach(port);
2384 tcpm_set_state(port, SRC_UNATTACHED,
2385 ret < 0 ? 0 : PD_T_PS_SOURCE_ON);
2386 break;
2387 case SRC_STARTUP:
2388 opmode = tcpm_get_pwr_opmode(tcpm_rp_cc(port));
2389 typec_set_pwr_opmode(port->typec_port, opmode);
2390 port->pwr_opmode = TYPEC_PWR_MODE_USB;
2391 port->caps_count = 0;
2392 port->message_id = 0;
2393 port->rx_msgid = -1;
2394 port->explicit_contract = false;
2395 tcpm_set_state(port, SRC_SEND_CAPABILITIES, 0);
2396 break;
2397 case SRC_SEND_CAPABILITIES:
2398 port->caps_count++;
2399 if (port->caps_count > PD_N_CAPS_COUNT) {
2400 tcpm_set_state(port, SRC_READY, 0);
2401 break;
2402 }
2403 ret = tcpm_pd_send_source_caps(port);
2404 if (ret < 0) {
2405 tcpm_set_state(port, SRC_SEND_CAPABILITIES,
2406 PD_T_SEND_SOURCE_CAP);
2407 } else {
2408 /*
2409 * Per standard, we should clear the reset counter here.
2410 * However, that can result in state machine hang-ups.
2411 * Reset it only in READY state to improve stability.
2412 */
2413 /* port->hard_reset_count = 0; */
2414 port->caps_count = 0;
2415 port->pd_capable = true;
2416 tcpm_set_state_cond(port, hard_reset_state(port),
2417 PD_T_SEND_SOURCE_CAP);
2418 }
2419 break;
2420 case SRC_NEGOTIATE_CAPABILITIES:
2421 ret = tcpm_pd_check_request(port);
2422 if (ret < 0) {
2423 tcpm_pd_send_control(port, PD_CTRL_REJECT);
2424 if (!port->explicit_contract) {
2425 tcpm_set_state(port,
2426 SRC_WAIT_NEW_CAPABILITIES, 0);
2427 } else {
2428 tcpm_set_state(port, SRC_READY, 0);
2429 }
2430 } else {
2431 tcpm_pd_send_control(port, PD_CTRL_ACCEPT);
2432 tcpm_set_state(port, SRC_TRANSITION_SUPPLY,
2433 PD_T_SRC_TRANSITION);
2434 }
2435 break;
2436 case SRC_TRANSITION_SUPPLY:
2437 /* XXX: regulator_set_voltage(vbus, ...) */
2438 tcpm_pd_send_control(port, PD_CTRL_PS_RDY);
2439 port->explicit_contract = true;
2440 typec_set_pwr_opmode(port->typec_port, TYPEC_PWR_MODE_PD);
2441 port->pwr_opmode = TYPEC_PWR_MODE_PD;
2442 tcpm_set_state_cond(port, SRC_READY, 0);
2443 break;
2444 case SRC_READY:
2445 #if 1
2446 port->hard_reset_count = 0;
2447 #endif
2448 port->try_src_count = 0;
2449
2450 tcpm_swap_complete(port, 0);
2451 tcpm_typec_connect(port);
2452 tcpm_check_send_discover(port);
2453 /*
2454 * 6.3.5
2455 * Sending ping messages is not necessary if
2456 * - the source operates at vSafe5V
2457 * or
2458 * - The system is not operating in PD mode
2459 * or
2460 * - Both partners are connected using a Type-C connector
2461 *
2462 * There is no actual need to send PD messages since the local
2463 * port type-c and the spec does not clearly say whether PD is
2464 * possible when type-c is connected to Type-A/B
2465 */
2466 break;
2467 case SRC_WAIT_NEW_CAPABILITIES:
2468 /* Nothing to do... */
2469 break;
2470
2471 /* SNK states */
2472 case SNK_UNATTACHED:
2473 if (!port->non_pd_role_swap)
2474 tcpm_swap_complete(port, -ENOTCONN);
2475 tcpm_snk_detach(port);
2476 if (tcpm_start_drp_toggling(port)) {
2477 tcpm_set_state(port, DRP_TOGGLING, 0);
2478 break;
2479 }
2480 tcpm_set_cc(port, TYPEC_CC_RD);
2481 if (port->port_type == TYPEC_PORT_DRP)
2482 tcpm_set_state(port, SRC_UNATTACHED, PD_T_DRP_SRC);
2483 break;
2484 case SNK_ATTACH_WAIT:
2485 if ((port->cc1 == TYPEC_CC_OPEN &&
2486 port->cc2 != TYPEC_CC_OPEN) ||
2487 (port->cc1 != TYPEC_CC_OPEN &&
2488 port->cc2 == TYPEC_CC_OPEN))
2489 tcpm_set_state(port, SNK_DEBOUNCED,
2490 PD_T_CC_DEBOUNCE);
2491 else if (tcpm_port_is_disconnected(port))
2492 tcpm_set_state(port, SNK_UNATTACHED,
2493 PD_T_PD_DEBOUNCE);
2494 break;
2495 case SNK_DEBOUNCED:
2496 if (tcpm_port_is_disconnected(port))
2497 tcpm_set_state(port, SNK_UNATTACHED,
2498 PD_T_PD_DEBOUNCE);
2499 else if (port->vbus_present)
2500 tcpm_set_state(port,
2501 tcpm_try_src(port) ? SRC_TRY
2502 : SNK_ATTACHED,
2503 0);
2504 else
2505 /* Wait for VBUS, but not forever */
2506 tcpm_set_state(port, PORT_RESET, PD_T_PS_SOURCE_ON);
2507 break;
2508
2509 case SRC_TRY:
2510 port->try_src_count++;
2511 tcpm_set_cc(port, tcpm_rp_cc(port));
2512 port->max_wait = 0;
2513 tcpm_set_state(port, SRC_TRY_WAIT, 0);
2514 break;
2515 case SRC_TRY_WAIT:
2516 if (port->max_wait == 0) {
2517 port->max_wait = jiffies +
2518 msecs_to_jiffies(PD_T_DRP_TRY);
2519 msecs = PD_T_DRP_TRY;
2520 } else {
2521 if (time_is_after_jiffies(port->max_wait))
2522 msecs = jiffies_to_msecs(port->max_wait -
2523 jiffies);
2524 else
2525 msecs = 0;
2526 }
2527 tcpm_set_state(port, SNK_TRYWAIT, msecs);
2528 break;
2529 case SRC_TRY_DEBOUNCE:
2530 tcpm_set_state(port, SRC_ATTACHED, PD_T_PD_DEBOUNCE);
2531 break;
2532 case SNK_TRYWAIT:
2533 tcpm_set_cc(port, TYPEC_CC_RD);
2534 tcpm_set_state(port, SNK_TRYWAIT_VBUS, PD_T_CC_DEBOUNCE);
2535 break;
2536 case SNK_TRYWAIT_VBUS:
2537 /*
2538 * TCPM stays in this state indefinitely until VBUS
2539 * is detected as long as Rp is not detected for
2540 * more than a time period of tPDDebounce.
2541 */
2542 if (port->vbus_present && tcpm_port_is_sink(port)) {
2543 tcpm_set_state(port, SNK_ATTACHED, 0);
2544 break;
2545 }
2546 if (!tcpm_port_is_sink(port))
2547 tcpm_set_state(port, SNK_TRYWAIT_DEBOUNCE, 0);
2548 break;
2549 case SNK_TRYWAIT_DEBOUNCE:
2550 tcpm_set_state(port, SNK_UNATTACHED, PD_T_PD_DEBOUNCE);
2551 break;
2552 case SNK_ATTACHED:
2553 ret = tcpm_snk_attach(port);
2554 if (ret < 0)
2555 tcpm_set_state(port, SNK_UNATTACHED, 0);
2556 else
2557 tcpm_set_state(port, SNK_STARTUP, 0);
2558 break;
2559 case SNK_STARTUP:
2560 opmode = tcpm_get_pwr_opmode(port->polarity ?
2561 port->cc2 : port->cc1);
2562 typec_set_pwr_opmode(port->typec_port, opmode);
2563 port->pwr_opmode = TYPEC_PWR_MODE_USB;
2564 port->message_id = 0;
2565 port->rx_msgid = -1;
2566 port->explicit_contract = false;
2567 tcpm_set_state(port, SNK_DISCOVERY, 0);
2568 break;
2569 case SNK_DISCOVERY:
2570 if (port->vbus_present) {
2571 tcpm_set_current_limit(port,
2572 tcpm_get_current_limit(port),
2573 5000);
2574 tcpm_set_charge(port, true);
2575 tcpm_set_state(port, SNK_WAIT_CAPABILITIES, 0);
2576 break;
2577 }
2578 /*
2579 * For DRP, timeouts differ. Also, handling is supposed to be
2580 * different and much more complex (dead battery detection;
2581 * see USB power delivery specification, section 8.3.3.6.1.5.1).
2582 */
2583 tcpm_set_state(port, hard_reset_state(port),
2584 port->port_type == TYPEC_PORT_DRP ?
2585 PD_T_DB_DETECT : PD_T_NO_RESPONSE);
2586 break;
2587 case SNK_DISCOVERY_DEBOUNCE:
2588 tcpm_set_state(port, SNK_DISCOVERY_DEBOUNCE_DONE,
2589 PD_T_CC_DEBOUNCE);
2590 break;
2591 case SNK_DISCOVERY_DEBOUNCE_DONE:
2592 if (!tcpm_port_is_disconnected(port) &&
2593 tcpm_port_is_sink(port) &&
2594 time_is_after_jiffies(port->delayed_runtime)) {
2595 tcpm_set_state(port, SNK_DISCOVERY,
2596 port->delayed_runtime - jiffies);
2597 break;
2598 }
2599 tcpm_set_state(port, unattached_state(port), 0);
2600 break;
2601 case SNK_WAIT_CAPABILITIES:
2602 ret = port->tcpc->set_pd_rx(port->tcpc, true);
2603 if (ret < 0) {
2604 tcpm_set_state(port, SNK_READY, 0);
2605 break;
2606 }
2607 /*
2608 * If VBUS has never been low, and we time out waiting
2609 * for source cap, try a soft reset first, in case we
2610 * were already in a stable contract before this boot.
2611 * Do this only once.
2612 */
2613 if (port->vbus_never_low) {
2614 port->vbus_never_low = false;
2615 tcpm_set_state(port, SOFT_RESET_SEND,
2616 PD_T_SINK_WAIT_CAP);
2617 } else {
2618 tcpm_set_state(port, hard_reset_state(port),
2619 PD_T_SINK_WAIT_CAP);
2620 }
2621 break;
2622 case SNK_NEGOTIATE_CAPABILITIES:
2623 port->pd_capable = true;
2624 port->hard_reset_count = 0;
2625 ret = tcpm_pd_send_request(port);
2626 if (ret < 0) {
2627 /* Let the Source send capabilities again. */
2628 tcpm_set_state(port, SNK_WAIT_CAPABILITIES, 0);
2629 } else {
2630 tcpm_set_state_cond(port, hard_reset_state(port),
2631 PD_T_SENDER_RESPONSE);
2632 }
2633 break;
2634 case SNK_TRANSITION_SINK:
2635 case SNK_TRANSITION_SINK_VBUS:
2636 tcpm_set_state(port, hard_reset_state(port),
2637 PD_T_PS_TRANSITION);
2638 break;
2639 case SNK_READY:
2640 port->try_snk_count = 0;
2641 if (port->explicit_contract) {
2642 typec_set_pwr_opmode(port->typec_port,
2643 TYPEC_PWR_MODE_PD);
2644 port->pwr_opmode = TYPEC_PWR_MODE_PD;
2645 }
2646
2647 tcpm_swap_complete(port, 0);
2648 tcpm_typec_connect(port);
2649 tcpm_check_send_discover(port);
2650 break;
2651
2652 /* Accessory states */
2653 case ACC_UNATTACHED:
2654 tcpm_acc_detach(port);
2655 tcpm_set_state(port, SRC_UNATTACHED, 0);
2656 break;
2657 case DEBUG_ACC_ATTACHED:
2658 case AUDIO_ACC_ATTACHED:
2659 ret = tcpm_acc_attach(port);
2660 if (ret < 0)
2661 tcpm_set_state(port, ACC_UNATTACHED, 0);
2662 break;
2663 case AUDIO_ACC_DEBOUNCE:
2664 tcpm_set_state(port, ACC_UNATTACHED, PD_T_CC_DEBOUNCE);
2665 break;
2666
2667 /* Hard_Reset states */
2668 case HARD_RESET_SEND:
2669 tcpm_pd_transmit(port, TCPC_TX_HARD_RESET, NULL);
2670 tcpm_set_state(port, HARD_RESET_START, 0);
2671 break;
2672 case HARD_RESET_START:
2673 port->hard_reset_count++;
2674 port->tcpc->set_pd_rx(port->tcpc, false);
2675 tcpm_unregister_altmodes(port);
2676 port->send_discover = true;
2677 if (port->pwr_role == TYPEC_SOURCE)
2678 tcpm_set_state(port, SRC_HARD_RESET_VBUS_OFF,
2679 PD_T_PS_HARD_RESET);
2680 else
2681 tcpm_set_state(port, SNK_HARD_RESET_SINK_OFF, 0);
2682 break;
2683 case SRC_HARD_RESET_VBUS_OFF:
2684 tcpm_set_vconn(port, true);
2685 tcpm_set_vbus(port, false);
2686 tcpm_set_roles(port, false, TYPEC_SOURCE, TYPEC_HOST);
2687 tcpm_set_state(port, SRC_HARD_RESET_VBUS_ON, PD_T_SRC_RECOVER);
2688 break;
2689 case SRC_HARD_RESET_VBUS_ON:
2690 tcpm_set_vbus(port, true);
2691 port->tcpc->set_pd_rx(port->tcpc, true);
2692 tcpm_set_attached_state(port, true);
2693 tcpm_set_state(port, SRC_UNATTACHED, PD_T_PS_SOURCE_ON);
2694 break;
2695 case SNK_HARD_RESET_SINK_OFF:
2696 tcpm_set_vconn(port, false);
2697 tcpm_set_charge(port, false);
2698 tcpm_set_roles(port, false, TYPEC_SINK, TYPEC_DEVICE);
2699 /*
2700 * VBUS may or may not toggle, depending on the adapter.
2701 * If it doesn't toggle, transition to SNK_HARD_RESET_SINK_ON
2702 * directly after timeout.
2703 */
2704 tcpm_set_state(port, SNK_HARD_RESET_SINK_ON, PD_T_SAFE_0V);
2705 break;
2706 case SNK_HARD_RESET_WAIT_VBUS:
2707 /* Assume we're disconnected if VBUS doesn't come back. */
2708 tcpm_set_state(port, SNK_UNATTACHED,
2709 PD_T_SRC_RECOVER_MAX + PD_T_SRC_TURN_ON);
2710 break;
2711 case SNK_HARD_RESET_SINK_ON:
2712 /* Note: There is no guarantee that VBUS is on in this state */
2713 /*
2714 * XXX:
2715 * The specification suggests that dual mode ports in sink
2716 * mode should transition to state PE_SRC_Transition_to_default.
2717 * See USB power delivery specification chapter 8.3.3.6.1.3.
2718 * This would mean to to
2719 * - turn off VCONN, reset power supply
2720 * - request hardware reset
2721 * - turn on VCONN
2722 * - Transition to state PE_Src_Startup
2723 * SNK only ports shall transition to state Snk_Startup
2724 * (see chapter 8.3.3.3.8).
2725 * Similar, dual-mode ports in source mode should transition
2726 * to PE_SNK_Transition_to_default.
2727 */
2728 tcpm_set_attached_state(port, true);
2729 tcpm_set_state(port, SNK_STARTUP, 0);
2730 break;
2731
2732 /* Soft_Reset states */
2733 case SOFT_RESET:
2734 port->message_id = 0;
2735 port->rx_msgid = -1;
2736 tcpm_pd_send_control(port, PD_CTRL_ACCEPT);
2737 if (port->pwr_role == TYPEC_SOURCE)
2738 tcpm_set_state(port, SRC_SEND_CAPABILITIES, 0);
2739 else
2740 tcpm_set_state(port, SNK_WAIT_CAPABILITIES, 0);
2741 break;
2742 case SOFT_RESET_SEND:
2743 port->message_id = 0;
2744 port->rx_msgid = -1;
2745 if (tcpm_pd_send_control(port, PD_CTRL_SOFT_RESET))
2746 tcpm_set_state_cond(port, hard_reset_state(port), 0);
2747 else
2748 tcpm_set_state_cond(port, hard_reset_state(port),
2749 PD_T_SENDER_RESPONSE);
2750 break;
2751
2752 /* DR_Swap states */
2753 case DR_SWAP_SEND:
2754 tcpm_pd_send_control(port, PD_CTRL_DR_SWAP);
2755 tcpm_set_state_cond(port, DR_SWAP_SEND_TIMEOUT,
2756 PD_T_SENDER_RESPONSE);
2757 break;
2758 case DR_SWAP_ACCEPT:
2759 tcpm_pd_send_control(port, PD_CTRL_ACCEPT);
2760 tcpm_set_state_cond(port, DR_SWAP_CHANGE_DR, 0);
2761 break;
2762 case DR_SWAP_SEND_TIMEOUT:
2763 tcpm_swap_complete(port, -ETIMEDOUT);
2764 tcpm_set_state(port, ready_state(port), 0);
2765 break;
2766 case DR_SWAP_CHANGE_DR:
2767 if (port->data_role == TYPEC_HOST) {
2768 tcpm_unregister_altmodes(port);
2769 tcpm_set_roles(port, true, port->pwr_role,
2770 TYPEC_DEVICE);
2771 } else {
2772 tcpm_set_roles(port, true, port->pwr_role,
2773 TYPEC_HOST);
2774 port->send_discover = true;
2775 }
2776 tcpm_set_state(port, ready_state(port), 0);
2777 break;
2778
2779 /* PR_Swap states */
2780 case PR_SWAP_ACCEPT:
2781 tcpm_pd_send_control(port, PD_CTRL_ACCEPT);
2782 tcpm_set_state(port, PR_SWAP_START, 0);
2783 break;
2784 case PR_SWAP_SEND:
2785 tcpm_pd_send_control(port, PD_CTRL_PR_SWAP);
2786 tcpm_set_state_cond(port, PR_SWAP_SEND_TIMEOUT,
2787 PD_T_SENDER_RESPONSE);
2788 break;
2789 case PR_SWAP_SEND_TIMEOUT:
2790 tcpm_swap_complete(port, -ETIMEDOUT);
2791 tcpm_set_state(port, ready_state(port), 0);
2792 break;
2793 case PR_SWAP_START:
2794 if (port->pwr_role == TYPEC_SOURCE)
2795 tcpm_set_state(port, PR_SWAP_SRC_SNK_TRANSITION_OFF,
2796 PD_T_SRC_TRANSITION);
2797 else
2798 tcpm_set_state(port, PR_SWAP_SNK_SRC_SINK_OFF, 0);
2799 break;
2800 case PR_SWAP_SRC_SNK_TRANSITION_OFF:
2801 tcpm_set_vbus(port, false);
2802 port->explicit_contract = false;
2803 /* allow time for Vbus discharge, must be < tSrcSwapStdby */
2804 tcpm_set_state(port, PR_SWAP_SRC_SNK_SOURCE_OFF,
2805 PD_T_SRCSWAPSTDBY);
2806 break;
2807 case PR_SWAP_SRC_SNK_SOURCE_OFF:
2808 tcpm_set_cc(port, TYPEC_CC_RD);
2809 /* allow CC debounce */
2810 tcpm_set_state(port, PR_SWAP_SRC_SNK_SOURCE_OFF_CC_DEBOUNCED,
2811 PD_T_CC_DEBOUNCE);
2812 break;
2813 case PR_SWAP_SRC_SNK_SOURCE_OFF_CC_DEBOUNCED:
2814 /*
2815 * USB-PD standard, 6.2.1.4, Port Power Role:
2816 * "During the Power Role Swap Sequence, for the initial Source
2817 * Port, the Port Power Role field shall be set to Sink in the
2818 * PS_RDY Message indicating that the initial Source’s power
2819 * supply is turned off"
2820 */
2821 tcpm_set_pwr_role(port, TYPEC_SINK);
2822 if (tcpm_pd_send_control(port, PD_CTRL_PS_RDY)) {
2823 tcpm_set_state(port, ERROR_RECOVERY, 0);
2824 break;
2825 }
2826 tcpm_set_state_cond(port, SNK_UNATTACHED, PD_T_PS_SOURCE_ON);
2827 break;
2828 case PR_SWAP_SRC_SNK_SINK_ON:
2829 tcpm_set_state(port, SNK_STARTUP, 0);
2830 break;
2831 case PR_SWAP_SNK_SRC_SINK_OFF:
2832 tcpm_set_charge(port, false);
2833 tcpm_set_state(port, hard_reset_state(port),
2834 PD_T_PS_SOURCE_OFF);
2835 break;
2836 case PR_SWAP_SNK_SRC_SOURCE_ON:
2837 tcpm_set_cc(port, tcpm_rp_cc(port));
2838 tcpm_set_vbus(port, true);
2839 /*
2840 * allow time VBUS ramp-up, must be < tNewSrc
2841 * Also, this window overlaps with CC debounce as well.
2842 * So, Wait for the max of two which is PD_T_NEWSRC
2843 */
2844 tcpm_set_state(port, PR_SWAP_SNK_SRC_SOURCE_ON_VBUS_RAMPED_UP,
2845 PD_T_NEWSRC);
2846 break;
2847 case PR_SWAP_SNK_SRC_SOURCE_ON_VBUS_RAMPED_UP:
2848 /*
2849 * USB PD standard, 6.2.1.4:
2850 * "Subsequent Messages initiated by the Policy Engine,
2851 * such as the PS_RDY Message sent to indicate that Vbus
2852 * is ready, will have the Port Power Role field set to
2853 * Source."
2854 */
2855 tcpm_set_pwr_role(port, TYPEC_SOURCE);
2856 tcpm_pd_send_control(port, PD_CTRL_PS_RDY);
2857 tcpm_set_state(port, SRC_STARTUP, 0);
2858 break;
2859
2860 case VCONN_SWAP_ACCEPT:
2861 tcpm_pd_send_control(port, PD_CTRL_ACCEPT);
2862 tcpm_set_state(port, VCONN_SWAP_START, 0);
2863 break;
2864 case VCONN_SWAP_SEND:
2865 tcpm_pd_send_control(port, PD_CTRL_VCONN_SWAP);
2866 tcpm_set_state(port, VCONN_SWAP_SEND_TIMEOUT,
2867 PD_T_SENDER_RESPONSE);
2868 break;
2869 case VCONN_SWAP_SEND_TIMEOUT:
2870 tcpm_swap_complete(port, -ETIMEDOUT);
2871 tcpm_set_state(port, ready_state(port), 0);
2872 break;
2873 case VCONN_SWAP_START:
2874 if (port->vconn_role == TYPEC_SOURCE)
2875 tcpm_set_state(port, VCONN_SWAP_WAIT_FOR_VCONN, 0);
2876 else
2877 tcpm_set_state(port, VCONN_SWAP_TURN_ON_VCONN, 0);
2878 break;
2879 case VCONN_SWAP_WAIT_FOR_VCONN:
2880 tcpm_set_state(port, hard_reset_state(port),
2881 PD_T_VCONN_SOURCE_ON);
2882 break;
2883 case VCONN_SWAP_TURN_ON_VCONN:
2884 tcpm_set_vconn(port, true);
2885 tcpm_pd_send_control(port, PD_CTRL_PS_RDY);
2886 tcpm_set_state(port, ready_state(port), 0);
2887 break;
2888 case VCONN_SWAP_TURN_OFF_VCONN:
2889 tcpm_set_vconn(port, false);
2890 tcpm_set_state(port, ready_state(port), 0);
2891 break;
2892
2893 case DR_SWAP_CANCEL:
2894 case PR_SWAP_CANCEL:
2895 case VCONN_SWAP_CANCEL:
2896 tcpm_swap_complete(port, port->swap_status);
2897 if (port->pwr_role == TYPEC_SOURCE)
2898 tcpm_set_state(port, SRC_READY, 0);
2899 else
2900 tcpm_set_state(port, SNK_READY, 0);
2901 break;
2902
2903 case BIST_RX:
2904 switch (BDO_MODE_MASK(port->bist_request)) {
2905 case BDO_MODE_CARRIER2:
2906 tcpm_pd_transmit(port, TCPC_TX_BIST_MODE_2, NULL);
2907 break;
2908 default:
2909 break;
2910 }
2911 /* Always switch to unattached state */
2912 tcpm_set_state(port, unattached_state(port), 0);
2913 break;
2914 case ERROR_RECOVERY:
2915 tcpm_swap_complete(port, -EPROTO);
2916 tcpm_set_state(port, PORT_RESET, 0);
2917 break;
2918 case PORT_RESET:
2919 tcpm_reset_port(port);
2920 tcpm_set_cc(port, TYPEC_CC_OPEN);
2921 tcpm_set_state(port, PORT_RESET_WAIT_OFF,
2922 PD_T_ERROR_RECOVERY);
2923 break;
2924 case PORT_RESET_WAIT_OFF:
2925 tcpm_set_state(port,
2926 tcpm_default_state(port),
2927 port->vbus_present ? PD_T_PS_SOURCE_OFF : 0);
2928 break;
2929 default:
2930 WARN(1, "Unexpected port state %d\n", port->state);
2931 break;
2932 }
2933 }
2934
2935 static void tcpm_state_machine_work(struct work_struct *work)
2936 {
2937 struct tcpm_port *port = container_of(work, struct tcpm_port,
2938 state_machine.work);
2939 enum tcpm_state prev_state;
2940
2941 mutex_lock(&port->lock);
2942 port->state_machine_running = true;
2943
2944 if (port->queued_message && tcpm_send_queued_message(port))
2945 goto done;
2946
2947 /* If we were queued due to a delayed state change, update it now */
2948 if (port->delayed_state) {
2949 tcpm_log(port, "state change %s -> %s [delayed %ld ms]",
2950 tcpm_states[port->state],
2951 tcpm_states[port->delayed_state], port->delay_ms);
2952 port->prev_state = port->state;
2953 port->state = port->delayed_state;
2954 port->delayed_state = INVALID_STATE;
2955 }
2956
2957 /*
2958 * Continue running as long as we have (non-delayed) state changes
2959 * to make.
2960 */
2961 do {
2962 prev_state = port->state;
2963 run_state_machine(port);
2964 if (port->queued_message)
2965 tcpm_send_queued_message(port);
2966 } while (port->state != prev_state && !port->delayed_state);
2967
2968 done:
2969 port->state_machine_running = false;
2970 mutex_unlock(&port->lock);
2971 }
2972
2973 static void _tcpm_cc_change(struct tcpm_port *port, enum typec_cc_status cc1,
2974 enum typec_cc_status cc2)
2975 {
2976 enum typec_cc_status old_cc1, old_cc2;
2977 enum tcpm_state new_state;
2978
2979 old_cc1 = port->cc1;
2980 old_cc2 = port->cc2;
2981 port->cc1 = cc1;
2982 port->cc2 = cc2;
2983
2984 tcpm_log_force(port,
2985 "CC1: %u -> %u, CC2: %u -> %u [state %s, polarity %d, %s]",
2986 old_cc1, cc1, old_cc2, cc2, tcpm_states[port->state],
2987 port->polarity,
2988 tcpm_port_is_disconnected(port) ? "disconnected"
2989 : "connected");
2990
2991 switch (port->state) {
2992 case DRP_TOGGLING:
2993 if (tcpm_port_is_debug(port) || tcpm_port_is_audio(port) ||
2994 tcpm_port_is_source(port))
2995 tcpm_set_state(port, SRC_ATTACH_WAIT, 0);
2996 else if (tcpm_port_is_sink(port))
2997 tcpm_set_state(port, SNK_ATTACH_WAIT, 0);
2998 break;
2999 case SRC_UNATTACHED:
3000 case ACC_UNATTACHED:
3001 if (tcpm_port_is_debug(port) || tcpm_port_is_audio(port) ||
3002 tcpm_port_is_source(port))
3003 tcpm_set_state(port, SRC_ATTACH_WAIT, 0);
3004 break;
3005 case SRC_ATTACH_WAIT:
3006 if (tcpm_port_is_disconnected(port) ||
3007 tcpm_port_is_audio_detached(port))
3008 tcpm_set_state(port, SRC_UNATTACHED, 0);
3009 else if (cc1 != old_cc1 || cc2 != old_cc2)
3010 tcpm_set_state(port, SRC_ATTACH_WAIT, 0);
3011 break;
3012 case SRC_ATTACHED:
3013 case SRC_SEND_CAPABILITIES:
3014 case SRC_READY:
3015 if (tcpm_port_is_disconnected(port) ||
3016 !tcpm_port_is_source(port))
3017 tcpm_set_state(port, SRC_UNATTACHED, 0);
3018 break;
3019 case SNK_UNATTACHED:
3020 if (tcpm_port_is_sink(port))
3021 tcpm_set_state(port, SNK_ATTACH_WAIT, 0);
3022 break;
3023 case SNK_ATTACH_WAIT:
3024 if ((port->cc1 == TYPEC_CC_OPEN &&
3025 port->cc2 != TYPEC_CC_OPEN) ||
3026 (port->cc1 != TYPEC_CC_OPEN &&
3027 port->cc2 == TYPEC_CC_OPEN))
3028 new_state = SNK_DEBOUNCED;
3029 else if (tcpm_port_is_disconnected(port))
3030 new_state = SNK_UNATTACHED;
3031 else
3032 break;
3033 if (new_state != port->delayed_state)
3034 tcpm_set_state(port, SNK_ATTACH_WAIT, 0);
3035 break;
3036 case SNK_DEBOUNCED:
3037 if (tcpm_port_is_disconnected(port))
3038 new_state = SNK_UNATTACHED;
3039 else if (port->vbus_present)
3040 new_state = tcpm_try_src(port) ? SRC_TRY : SNK_ATTACHED;
3041 else
3042 new_state = SNK_UNATTACHED;
3043 if (new_state != port->delayed_state)
3044 tcpm_set_state(port, SNK_DEBOUNCED, 0);
3045 break;
3046 case SNK_READY:
3047 if (tcpm_port_is_disconnected(port))
3048 tcpm_set_state(port, unattached_state(port), 0);
3049 else if (!port->pd_capable &&
3050 (cc1 != old_cc1 || cc2 != old_cc2))
3051 tcpm_set_current_limit(port,
3052 tcpm_get_current_limit(port),
3053 5000);
3054 break;
3055
3056 case AUDIO_ACC_ATTACHED:
3057 if (cc1 == TYPEC_CC_OPEN || cc2 == TYPEC_CC_OPEN)
3058 tcpm_set_state(port, AUDIO_ACC_DEBOUNCE, 0);
3059 break;
3060 case AUDIO_ACC_DEBOUNCE:
3061 if (tcpm_port_is_audio(port))
3062 tcpm_set_state(port, AUDIO_ACC_ATTACHED, 0);
3063 break;
3064
3065 case DEBUG_ACC_ATTACHED:
3066 if (cc1 == TYPEC_CC_OPEN || cc2 == TYPEC_CC_OPEN)
3067 tcpm_set_state(port, ACC_UNATTACHED, 0);
3068 break;
3069
3070 case SNK_TRY:
3071 /* Do nothing, waiting for timeout */
3072 break;
3073
3074 case SNK_DISCOVERY:
3075 /* CC line is unstable, wait for debounce */
3076 if (tcpm_port_is_disconnected(port))
3077 tcpm_set_state(port, SNK_DISCOVERY_DEBOUNCE, 0);
3078 break;
3079 case SNK_DISCOVERY_DEBOUNCE:
3080 break;
3081
3082 case SRC_TRYWAIT:
3083 /* Hand over to state machine if needed */
3084 if (!port->vbus_present && tcpm_port_is_source(port))
3085 tcpm_set_state(port, SRC_TRYWAIT_DEBOUNCE, 0);
3086 break;
3087 case SRC_TRYWAIT_DEBOUNCE:
3088 if (port->vbus_present || !tcpm_port_is_source(port))
3089 tcpm_set_state(port, SRC_TRYWAIT, 0);
3090 break;
3091 case SNK_TRY_WAIT_DEBOUNCE:
3092 if (!tcpm_port_is_sink(port)) {
3093 port->max_wait = 0;
3094 tcpm_set_state(port, SRC_TRYWAIT, 0);
3095 }
3096 break;
3097 case SRC_TRY_WAIT:
3098 if (tcpm_port_is_source(port))
3099 tcpm_set_state(port, SRC_TRY_DEBOUNCE, 0);
3100 break;
3101 case SRC_TRY_DEBOUNCE:
3102 tcpm_set_state(port, SRC_TRY_WAIT, 0);
3103 break;
3104 case SNK_TRYWAIT_DEBOUNCE:
3105 if (tcpm_port_is_sink(port))
3106 tcpm_set_state(port, SNK_TRYWAIT_VBUS, 0);
3107 break;
3108 case SNK_TRYWAIT_VBUS:
3109 if (!tcpm_port_is_sink(port))
3110 tcpm_set_state(port, SNK_TRYWAIT_DEBOUNCE, 0);
3111 break;
3112 case SNK_TRYWAIT:
3113 /* Do nothing, waiting for tCCDebounce */
3114 break;
3115 case PR_SWAP_SNK_SRC_SINK_OFF:
3116 case PR_SWAP_SRC_SNK_TRANSITION_OFF:
3117 case PR_SWAP_SRC_SNK_SOURCE_OFF:
3118 case PR_SWAP_SRC_SNK_SOURCE_OFF_CC_DEBOUNCED:
3119 case PR_SWAP_SNK_SRC_SOURCE_ON:
3120 /*
3121 * CC state change is expected in PR_SWAP
3122 * Ignore it.
3123 */
3124 break;
3125
3126 default:
3127 if (tcpm_port_is_disconnected(port))
3128 tcpm_set_state(port, unattached_state(port), 0);
3129 break;
3130 }
3131 }
3132
3133 static void _tcpm_pd_vbus_on(struct tcpm_port *port)
3134 {
3135 tcpm_log_force(port, "VBUS on");
3136 port->vbus_present = true;
3137 switch (port->state) {
3138 case SNK_TRANSITION_SINK_VBUS:
3139 port->explicit_contract = true;
3140 tcpm_set_state(port, SNK_READY, 0);
3141 break;
3142 case SNK_DISCOVERY:
3143 tcpm_set_state(port, SNK_DISCOVERY, 0);
3144 break;
3145
3146 case SNK_DEBOUNCED:
3147 tcpm_set_state(port, tcpm_try_src(port) ? SRC_TRY
3148 : SNK_ATTACHED,
3149 0);
3150 break;
3151 case SNK_HARD_RESET_WAIT_VBUS:
3152 tcpm_set_state(port, SNK_HARD_RESET_SINK_ON, 0);
3153 break;
3154 case SRC_ATTACHED:
3155 tcpm_set_state(port, SRC_STARTUP, 0);
3156 break;
3157 case SRC_HARD_RESET_VBUS_ON:
3158 tcpm_set_state(port, SRC_STARTUP, 0);
3159 break;
3160
3161 case SNK_TRY:
3162 /* Do nothing, waiting for timeout */
3163 break;
3164 case SRC_TRYWAIT:
3165 /* Do nothing, Waiting for Rd to be detected */
3166 break;
3167 case SRC_TRYWAIT_DEBOUNCE:
3168 tcpm_set_state(port, SRC_TRYWAIT, 0);
3169 break;
3170 case SNK_TRY_WAIT_DEBOUNCE:
3171 /* Do nothing, waiting for PD_DEBOUNCE to do be done */
3172 break;
3173 case SNK_TRYWAIT:
3174 /* Do nothing, waiting for tCCDebounce */
3175 break;
3176 case SNK_TRYWAIT_VBUS:
3177 if (tcpm_port_is_sink(port))
3178 tcpm_set_state(port, SNK_ATTACHED, 0);
3179 break;
3180 case SNK_TRYWAIT_DEBOUNCE:
3181 /* Do nothing, waiting for Rp */
3182 break;
3183 case SRC_TRY_WAIT:
3184 case SRC_TRY_DEBOUNCE:
3185 /* Do nothing, waiting for sink detection */
3186 break;
3187 default:
3188 break;
3189 }
3190 }
3191
3192 static void _tcpm_pd_vbus_off(struct tcpm_port *port)
3193 {
3194 tcpm_log_force(port, "VBUS off");
3195 port->vbus_present = false;
3196 port->vbus_never_low = false;
3197 switch (port->state) {
3198 case SNK_HARD_RESET_SINK_OFF:
3199 tcpm_set_state(port, SNK_HARD_RESET_WAIT_VBUS, 0);
3200 break;
3201 case SRC_HARD_RESET_VBUS_OFF:
3202 tcpm_set_state(port, SRC_HARD_RESET_VBUS_ON, 0);
3203 break;
3204 case HARD_RESET_SEND:
3205 break;
3206
3207 case SNK_TRY:
3208 /* Do nothing, waiting for timeout */
3209 break;
3210 case SRC_TRYWAIT:
3211 /* Hand over to state machine if needed */
3212 if (tcpm_port_is_source(port))
3213 tcpm_set_state(port, SRC_TRYWAIT_DEBOUNCE, 0);
3214 break;
3215 case SNK_TRY_WAIT_DEBOUNCE:
3216 /* Do nothing, waiting for PD_DEBOUNCE to do be done */
3217 break;
3218 case SNK_TRYWAIT:
3219 case SNK_TRYWAIT_VBUS:
3220 case SNK_TRYWAIT_DEBOUNCE:
3221 break;
3222 case SNK_ATTACH_WAIT:
3223 tcpm_set_state(port, SNK_UNATTACHED, 0);
3224 break;
3225
3226 case SNK_NEGOTIATE_CAPABILITIES:
3227 break;
3228
3229 case PR_SWAP_SRC_SNK_TRANSITION_OFF:
3230 tcpm_set_state(port, PR_SWAP_SRC_SNK_SOURCE_OFF, 0);
3231 break;
3232
3233 case PR_SWAP_SNK_SRC_SINK_OFF:
3234 /* Do nothing, expected */
3235 break;
3236
3237 case PORT_RESET_WAIT_OFF:
3238 tcpm_set_state(port, tcpm_default_state(port), 0);
3239 break;
3240 case SRC_TRY_WAIT:
3241 case SRC_TRY_DEBOUNCE:
3242 /* Do nothing, waiting for sink detection */
3243 break;
3244 default:
3245 if (port->pwr_role == TYPEC_SINK &&
3246 port->attached)
3247 tcpm_set_state(port, SNK_UNATTACHED, 0);
3248 break;
3249 }
3250 }
3251
3252 static void _tcpm_pd_hard_reset(struct tcpm_port *port)
3253 {
3254 tcpm_log_force(port, "Received hard reset");
3255 /*
3256 * If we keep receiving hard reset requests, executing the hard reset
3257 * must have failed. Revert to error recovery if that happens.
3258 */
3259 tcpm_set_state(port,
3260 port->hard_reset_count < PD_N_HARD_RESET_COUNT ?
3261 HARD_RESET_START : ERROR_RECOVERY,
3262 0);
3263 }
3264
3265 static void tcpm_pd_event_handler(struct work_struct *work)
3266 {
3267 struct tcpm_port *port = container_of(work, struct tcpm_port,
3268 event_work);
3269 u32 events;
3270
3271 mutex_lock(&port->lock);
3272
3273 spin_lock(&port->pd_event_lock);
3274 while (port->pd_events) {
3275 events = port->pd_events;
3276 port->pd_events = 0;
3277 spin_unlock(&port->pd_event_lock);
3278 if (events & TCPM_RESET_EVENT)
3279 _tcpm_pd_hard_reset(port);
3280 if (events & TCPM_VBUS_EVENT) {
3281 bool vbus;
3282
3283 vbus = port->tcpc->get_vbus(port->tcpc);
3284 if (vbus)
3285 _tcpm_pd_vbus_on(port);
3286 else
3287 _tcpm_pd_vbus_off(port);
3288 }
3289 if (events & TCPM_CC_EVENT) {
3290 enum typec_cc_status cc1, cc2;
3291
3292 if (port->tcpc->get_cc(port->tcpc, &cc1, &cc2) == 0)
3293 _tcpm_cc_change(port, cc1, cc2);
3294 }
3295 spin_lock(&port->pd_event_lock);
3296 }
3297 spin_unlock(&port->pd_event_lock);
3298 mutex_unlock(&port->lock);
3299 }
3300
3301 void tcpm_cc_change(struct tcpm_port *port)
3302 {
3303 spin_lock(&port->pd_event_lock);
3304 port->pd_events |= TCPM_CC_EVENT;
3305 spin_unlock(&port->pd_event_lock);
3306 queue_work(port->wq, &port->event_work);
3307 }
3308 EXPORT_SYMBOL_GPL(tcpm_cc_change);
3309
3310 void tcpm_vbus_change(struct tcpm_port *port)
3311 {
3312 spin_lock(&port->pd_event_lock);
3313 port->pd_events |= TCPM_VBUS_EVENT;
3314 spin_unlock(&port->pd_event_lock);
3315 queue_work(port->wq, &port->event_work);
3316 }
3317 EXPORT_SYMBOL_GPL(tcpm_vbus_change);
3318
3319 void tcpm_pd_hard_reset(struct tcpm_port *port)
3320 {
3321 spin_lock(&port->pd_event_lock);
3322 port->pd_events = TCPM_RESET_EVENT;
3323 spin_unlock(&port->pd_event_lock);
3324 queue_work(port->wq, &port->event_work);
3325 }
3326 EXPORT_SYMBOL_GPL(tcpm_pd_hard_reset);
3327
3328 static int tcpm_dr_set(const struct typec_capability *cap,
3329 enum typec_data_role data)
3330 {
3331 struct tcpm_port *port = typec_cap_to_tcpm(cap);
3332 int ret;
3333
3334 mutex_lock(&port->swap_lock);
3335 mutex_lock(&port->lock);
3336
3337 if (port->port_type != TYPEC_PORT_DRP) {
3338 ret = -EINVAL;
3339 goto port_unlock;
3340 }
3341 if (port->state != SRC_READY && port->state != SNK_READY) {
3342 ret = -EAGAIN;
3343 goto port_unlock;
3344 }
3345
3346 if (port->data_role == data) {
3347 ret = 0;
3348 goto port_unlock;
3349 }
3350
3351 /*
3352 * XXX
3353 * 6.3.9: If an alternate mode is active, a request to swap
3354 * alternate modes shall trigger a port reset.
3355 * Reject data role swap request in this case.
3356 */
3357
3358 if (!port->pd_capable) {
3359 /*
3360 * If the partner is not PD capable, reset the port to
3361 * trigger a role change. This can only work if a preferred
3362 * role is configured, and if it matches the requested role.
3363 */
3364 if (port->try_role == TYPEC_NO_PREFERRED_ROLE ||
3365 port->try_role == port->pwr_role) {
3366 ret = -EINVAL;
3367 goto port_unlock;
3368 }
3369 port->non_pd_role_swap = true;
3370 tcpm_set_state(port, PORT_RESET, 0);
3371 } else {
3372 tcpm_set_state(port, DR_SWAP_SEND, 0);
3373 }
3374
3375 port->swap_status = 0;
3376 port->swap_pending = true;
3377 reinit_completion(&port->swap_complete);
3378 mutex_unlock(&port->lock);
3379
3380 if (!wait_for_completion_timeout(&port->swap_complete,
3381 msecs_to_jiffies(PD_ROLE_SWAP_TIMEOUT)))
3382 ret = -ETIMEDOUT;
3383 else
3384 ret = port->swap_status;
3385
3386 port->non_pd_role_swap = false;
3387 goto swap_unlock;
3388
3389 port_unlock:
3390 mutex_unlock(&port->lock);
3391 swap_unlock:
3392 mutex_unlock(&port->swap_lock);
3393 return ret;
3394 }
3395
3396 static int tcpm_pr_set(const struct typec_capability *cap,
3397 enum typec_role role)
3398 {
3399 struct tcpm_port *port = typec_cap_to_tcpm(cap);
3400 int ret;
3401
3402 mutex_lock(&port->swap_lock);
3403 mutex_lock(&port->lock);
3404
3405 if (port->port_type != TYPEC_PORT_DRP) {
3406 ret = -EINVAL;
3407 goto port_unlock;
3408 }
3409 if (port->state != SRC_READY && port->state != SNK_READY) {
3410 ret = -EAGAIN;
3411 goto port_unlock;
3412 }
3413
3414 if (role == port->pwr_role) {
3415 ret = 0;
3416 goto port_unlock;
3417 }
3418
3419 port->swap_status = 0;
3420 port->swap_pending = true;
3421 reinit_completion(&port->swap_complete);
3422 tcpm_set_state(port, PR_SWAP_SEND, 0);
3423 mutex_unlock(&port->lock);
3424
3425 if (!wait_for_completion_timeout(&port->swap_complete,
3426 msecs_to_jiffies(PD_ROLE_SWAP_TIMEOUT)))
3427 ret = -ETIMEDOUT;
3428 else
3429 ret = port->swap_status;
3430
3431 goto swap_unlock;
3432
3433 port_unlock:
3434 mutex_unlock(&port->lock);
3435 swap_unlock:
3436 mutex_unlock(&port->swap_lock);
3437 return ret;
3438 }
3439
3440 static int tcpm_vconn_set(const struct typec_capability *cap,
3441 enum typec_role role)
3442 {
3443 struct tcpm_port *port = typec_cap_to_tcpm(cap);
3444 int ret;
3445
3446 mutex_lock(&port->swap_lock);
3447 mutex_lock(&port->lock);
3448
3449 if (port->state != SRC_READY && port->state != SNK_READY) {
3450 ret = -EAGAIN;
3451 goto port_unlock;
3452 }
3453
3454 if (role == port->vconn_role) {
3455 ret = 0;
3456 goto port_unlock;
3457 }
3458
3459 port->swap_status = 0;
3460 port->swap_pending = true;
3461 reinit_completion(&port->swap_complete);
3462 tcpm_set_state(port, VCONN_SWAP_SEND, 0);
3463 mutex_unlock(&port->lock);
3464
3465 if (!wait_for_completion_timeout(&port->swap_complete,
3466 msecs_to_jiffies(PD_ROLE_SWAP_TIMEOUT)))
3467 ret = -ETIMEDOUT;
3468 else
3469 ret = port->swap_status;
3470
3471 goto swap_unlock;
3472
3473 port_unlock:
3474 mutex_unlock(&port->lock);
3475 swap_unlock:
3476 mutex_unlock(&port->swap_lock);
3477 return ret;
3478 }
3479
3480 static int tcpm_try_role(const struct typec_capability *cap, int role)
3481 {
3482 struct tcpm_port *port = typec_cap_to_tcpm(cap);
3483 struct tcpc_dev *tcpc = port->tcpc;
3484 int ret = 0;
3485
3486 mutex_lock(&port->lock);
3487 if (tcpc->try_role)
3488 ret = tcpc->try_role(tcpc, role);
3489 if (!ret && !tcpc->config->try_role_hw)
3490 port->try_role = role;
3491 port->try_src_count = 0;
3492 port->try_snk_count = 0;
3493 mutex_unlock(&port->lock);
3494
3495 return ret;
3496 }
3497
3498 static void tcpm_init(struct tcpm_port *port)
3499 {
3500 enum typec_cc_status cc1, cc2;
3501
3502 port->tcpc->init(port->tcpc);
3503
3504 tcpm_reset_port(port);
3505
3506 /*
3507 * XXX
3508 * Should possibly wait for VBUS to settle if it was enabled locally
3509 * since tcpm_reset_port() will disable VBUS.
3510 */
3511 port->vbus_present = port->tcpc->get_vbus(port->tcpc);
3512 if (port->vbus_present)
3513 port->vbus_never_low = true;
3514
3515 tcpm_set_state(port, tcpm_default_state(port), 0);
3516
3517 if (port->tcpc->get_cc(port->tcpc, &cc1, &cc2) == 0)
3518 _tcpm_cc_change(port, cc1, cc2);
3519
3520 /*
3521 * Some adapters need a clean slate at startup, and won't recover
3522 * otherwise. So do not try to be fancy and force a clean disconnect.
3523 */
3524 tcpm_set_state(port, PORT_RESET, 0);
3525 }
3526
3527 static int tcpm_port_type_set(const struct typec_capability *cap,
3528 enum typec_port_type type)
3529 {
3530 struct tcpm_port *port = typec_cap_to_tcpm(cap);
3531
3532 mutex_lock(&port->lock);
3533 if (type == port->port_type)
3534 goto port_unlock;
3535
3536 port->port_type = type;
3537
3538 if (!port->connected) {
3539 tcpm_set_state(port, PORT_RESET, 0);
3540 } else if (type == TYPEC_PORT_UFP) {
3541 if (!(port->pwr_role == TYPEC_SINK &&
3542 port->data_role == TYPEC_DEVICE))
3543 tcpm_set_state(port, PORT_RESET, 0);
3544 } else if (type == TYPEC_PORT_DFP) {
3545 if (!(port->pwr_role == TYPEC_SOURCE &&
3546 port->data_role == TYPEC_HOST))
3547 tcpm_set_state(port, PORT_RESET, 0);
3548 }
3549
3550 port_unlock:
3551 mutex_unlock(&port->lock);
3552 return 0;
3553 }
3554
3555 void tcpm_tcpc_reset(struct tcpm_port *port)
3556 {
3557 mutex_lock(&port->lock);
3558 /* XXX: Maintain PD connection if possible? */
3559 tcpm_init(port);
3560 mutex_unlock(&port->lock);
3561 }
3562 EXPORT_SYMBOL_GPL(tcpm_tcpc_reset);
3563
3564 static int tcpm_copy_pdos(u32 *dest_pdo, const u32 *src_pdo,
3565 unsigned int nr_pdo)
3566 {
3567 unsigned int i;
3568
3569 if (nr_pdo > PDO_MAX_OBJECTS)
3570 nr_pdo = PDO_MAX_OBJECTS;
3571
3572 for (i = 0; i < nr_pdo; i++)
3573 dest_pdo[i] = src_pdo[i];
3574
3575 return nr_pdo;
3576 }
3577
3578 static int tcpm_copy_vdos(u32 *dest_vdo, const u32 *src_vdo,
3579 unsigned int nr_vdo)
3580 {
3581 unsigned int i;
3582
3583 if (nr_vdo > VDO_MAX_OBJECTS)
3584 nr_vdo = VDO_MAX_OBJECTS;
3585
3586 for (i = 0; i < nr_vdo; i++)
3587 dest_vdo[i] = src_vdo[i];
3588
3589 return nr_vdo;
3590 }
3591
3592 int tcpm_update_source_capabilities(struct tcpm_port *port, const u32 *pdo,
3593 unsigned int nr_pdo)
3594 {
3595 if (tcpm_validate_caps(port, pdo, nr_pdo))
3596 return -EINVAL;
3597
3598 mutex_lock(&port->lock);
3599 port->nr_src_pdo = tcpm_copy_pdos(port->src_pdo, pdo, nr_pdo);
3600 switch (port->state) {
3601 case SRC_UNATTACHED:
3602 case SRC_ATTACH_WAIT:
3603 case SRC_TRYWAIT:
3604 tcpm_set_cc(port, tcpm_rp_cc(port));
3605 break;
3606 case SRC_SEND_CAPABILITIES:
3607 case SRC_NEGOTIATE_CAPABILITIES:
3608 case SRC_READY:
3609 case SRC_WAIT_NEW_CAPABILITIES:
3610 tcpm_set_cc(port, tcpm_rp_cc(port));
3611 tcpm_set_state(port, SRC_SEND_CAPABILITIES, 0);
3612 break;
3613 default:
3614 break;
3615 }
3616 mutex_unlock(&port->lock);
3617 return 0;
3618 }
3619 EXPORT_SYMBOL_GPL(tcpm_update_source_capabilities);
3620
3621 int tcpm_update_sink_capabilities(struct tcpm_port *port, const u32 *pdo,
3622 unsigned int nr_pdo,
3623 unsigned int max_snk_mv,
3624 unsigned int max_snk_ma,
3625 unsigned int max_snk_mw,
3626 unsigned int operating_snk_mw)
3627 {
3628 if (tcpm_validate_caps(port, pdo, nr_pdo))
3629 return -EINVAL;
3630
3631 mutex_lock(&port->lock);
3632 port->nr_snk_pdo = tcpm_copy_pdos(port->snk_pdo, pdo, nr_pdo);
3633 port->max_snk_mv = max_snk_mv;
3634 port->max_snk_ma = max_snk_ma;
3635 port->max_snk_mw = max_snk_mw;
3636 port->operating_snk_mw = operating_snk_mw;
3637
3638 switch (port->state) {
3639 case SNK_NEGOTIATE_CAPABILITIES:
3640 case SNK_READY:
3641 case SNK_TRANSITION_SINK:
3642 case SNK_TRANSITION_SINK_VBUS:
3643 tcpm_set_state(port, SNK_NEGOTIATE_CAPABILITIES, 0);
3644 break;
3645 default:
3646 break;
3647 }
3648 mutex_unlock(&port->lock);
3649 return 0;
3650 }
3651 EXPORT_SYMBOL_GPL(tcpm_update_sink_capabilities);
3652
3653 static int nr_type_pdos(const u32 *pdo, unsigned int nr_pdo,
3654 enum pd_pdo_type type)
3655 {
3656 int count = 0;
3657 int i;
3658
3659 for (i = 0; i < nr_pdo; i++) {
3660 if (pdo_type(pdo[i]) == type)
3661 count++;
3662 }
3663 return count;
3664 }
3665
3666 struct tcpm_port *tcpm_register_port(struct device *dev, struct tcpc_dev *tcpc)
3667 {
3668 struct tcpm_port *port;
3669 int i, err;
3670
3671 if (!dev || !tcpc || !tcpc->config ||
3672 !tcpc->get_vbus || !tcpc->set_cc || !tcpc->get_cc ||
3673 !tcpc->set_polarity || !tcpc->set_vconn || !tcpc->set_vbus ||
3674 !tcpc->set_pd_rx || !tcpc->set_roles || !tcpc->pd_transmit)
3675 return ERR_PTR(-EINVAL);
3676
3677 port = devm_kzalloc(dev, sizeof(*port), GFP_KERNEL);
3678 if (!port)
3679 return ERR_PTR(-ENOMEM);
3680
3681 port->dev = dev;
3682 port->tcpc = tcpc;
3683
3684 mutex_init(&port->lock);
3685 mutex_init(&port->swap_lock);
3686
3687 port->wq = create_singlethread_workqueue(dev_name(dev));
3688 if (!port->wq)
3689 return ERR_PTR(-ENOMEM);
3690 INIT_DELAYED_WORK(&port->state_machine, tcpm_state_machine_work);
3691 INIT_DELAYED_WORK(&port->vdm_state_machine, vdm_state_machine_work);
3692 INIT_WORK(&port->event_work, tcpm_pd_event_handler);
3693
3694 spin_lock_init(&port->pd_event_lock);
3695
3696 init_completion(&port->tx_complete);
3697 init_completion(&port->swap_complete);
3698 tcpm_debugfs_init(port);
3699
3700 if (tcpm_validate_caps(port, tcpc->config->src_pdo,
3701 tcpc->config->nr_src_pdo) ||
3702 tcpm_validate_caps(port, tcpc->config->snk_pdo,
3703 tcpc->config->nr_snk_pdo)) {
3704 err = -EINVAL;
3705 goto out_destroy_wq;
3706 }
3707 port->nr_src_pdo = tcpm_copy_pdos(port->src_pdo, tcpc->config->src_pdo,
3708 tcpc->config->nr_src_pdo);
3709 port->nr_snk_pdo = tcpm_copy_pdos(port->snk_pdo, tcpc->config->snk_pdo,
3710 tcpc->config->nr_snk_pdo);
3711 port->nr_fixed = nr_type_pdos(port->snk_pdo,
3712 port->nr_snk_pdo,
3713 PDO_TYPE_FIXED);
3714 port->nr_var = nr_type_pdos(port->snk_pdo,
3715 port->nr_snk_pdo,
3716 PDO_TYPE_VAR);
3717 port->nr_batt = nr_type_pdos(port->snk_pdo,
3718 port->nr_snk_pdo,
3719 PDO_TYPE_BATT);
3720 port->nr_snk_vdo = tcpm_copy_vdos(port->snk_vdo, tcpc->config->snk_vdo,
3721 tcpc->config->nr_snk_vdo);
3722
3723 port->max_snk_mv = tcpc->config->max_snk_mv;
3724 port->max_snk_ma = tcpc->config->max_snk_ma;
3725 port->max_snk_mw = tcpc->config->max_snk_mw;
3726 port->operating_snk_mw = tcpc->config->operating_snk_mw;
3727 if (!tcpc->config->try_role_hw)
3728 port->try_role = tcpc->config->default_role;
3729 else
3730 port->try_role = TYPEC_NO_PREFERRED_ROLE;
3731
3732 port->typec_caps.prefer_role = tcpc->config->default_role;
3733 port->typec_caps.type = tcpc->config->type;
3734 port->typec_caps.revision = 0x0120; /* Type-C spec release 1.2 */
3735 port->typec_caps.pd_revision = 0x0200; /* USB-PD spec release 2.0 */
3736 port->typec_caps.dr_set = tcpm_dr_set;
3737 port->typec_caps.pr_set = tcpm_pr_set;
3738 port->typec_caps.vconn_set = tcpm_vconn_set;
3739 port->typec_caps.try_role = tcpm_try_role;
3740 port->typec_caps.port_type_set = tcpm_port_type_set;
3741
3742 port->partner_desc.identity = &port->partner_ident;
3743 port->port_type = tcpc->config->type;
3744
3745 port->typec_port = typec_register_port(port->dev, &port->typec_caps);
3746 if (!port->typec_port) {
3747 err = -ENOMEM;
3748 goto out_destroy_wq;
3749 }
3750
3751 if (tcpc->config->alt_modes) {
3752 const struct typec_altmode_desc *paltmode = tcpc->config->alt_modes;
3753
3754 i = 0;
3755 while (paltmode->svid && i < ARRAY_SIZE(port->port_altmode)) {
3756 port->port_altmode[i] =
3757 typec_port_register_altmode(port->typec_port,
3758 paltmode);
3759 if (!port->port_altmode[i]) {
3760 tcpm_log(port,
3761 "%s: failed to register port alternate mode 0x%x",
3762 dev_name(dev), paltmode->svid);
3763 break;
3764 }
3765 i++;
3766 paltmode++;
3767 }
3768 }
3769
3770 mutex_lock(&port->lock);
3771 tcpm_init(port);
3772 mutex_unlock(&port->lock);
3773
3774 tcpm_log(port, "%s: registered", dev_name(dev));
3775 return port;
3776
3777 out_destroy_wq:
3778 destroy_workqueue(port->wq);
3779 return ERR_PTR(err);
3780 }
3781 EXPORT_SYMBOL_GPL(tcpm_register_port);
3782
3783 void tcpm_unregister_port(struct tcpm_port *port)
3784 {
3785 int i;
3786
3787 tcpm_reset_port(port);
3788 for (i = 0; i < ARRAY_SIZE(port->port_altmode); i++)
3789 typec_unregister_altmode(port->port_altmode[i]);
3790 typec_unregister_port(port->typec_port);
3791 tcpm_debugfs_exit(port);
3792 destroy_workqueue(port->wq);
3793 }
3794 EXPORT_SYMBOL_GPL(tcpm_unregister_port);
3795
3796 MODULE_AUTHOR("Guenter Roeck <groeck@chromium.org>");
3797 MODULE_DESCRIPTION("USB Type-C Port Manager");
3798 MODULE_LICENSE("GPL");
Ubuntu Hirsute Linux kernel mirror