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