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staging: typec: tcpm: Improve role swap with non PD capable partners
[mirror_ubuntu-hirsute-kernel.git] / drivers / staging / typec / tcpm.c
CommitLineData
f0690a25
GR		 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), \
b17dd571
GR		 118 S(PORT_RESET), \
119 S(PORT_RESET_WAIT_OFF)
f0690a25
GR		 120
121#define GENERATE_ENUM(e) e
122#define GENERATE_STRING(s) #s
123
124enum tcpm_state {
125 FOREACH_STATE(GENERATE_ENUM)
126};
127
128static const char * const tcpm_states[] = {
129 FOREACH_STATE(GENERATE_STRING)
130};
131
132enum vdm_states {
133 VDM_STATE_ERR_BUSY = -3,
134 VDM_STATE_ERR_SEND = -2,
135 VDM_STATE_ERR_TMOUT = -1,
136 VDM_STATE_DONE = 0,
137 /* Anything >0 represents an active state */
138 VDM_STATE_READY = 1,
139 VDM_STATE_BUSY = 2,
140 VDM_STATE_WAIT_RSP_BUSY = 3,
141};
142
143enum pd_msg_request {
144 PD_MSG_NONE = 0,
145 PD_MSG_CTRL_REJECT,
146 PD_MSG_CTRL_WAIT,
147 PD_MSG_DATA_SINK_CAP,
148 PD_MSG_DATA_SOURCE_CAP,
149};
150
151/* Events from low level driver */
152
153#define TCPM_CC_EVENT BIT(0)
154#define TCPM_VBUS_EVENT BIT(1)
155#define TCPM_RESET_EVENT BIT(2)
156
157#define LOG_BUFFER_ENTRIES 1024
158#define LOG_BUFFER_ENTRY_SIZE 128
159
160/* Alternate mode support */
161
162#define SVID_DISCOVERY_MAX 16
163
164struct pd_mode_data {
165 int svid_index; /* current SVID index */
166 int nsvids;
167 u16 svids[SVID_DISCOVERY_MAX];
168 int altmodes; /* number of alternate modes */
169 struct typec_altmode_desc altmode_desc[SVID_DISCOVERY_MAX];
170};
171
172struct tcpm_port {
173 struct device *dev;
174
175 struct mutex lock; /* tcpm state machine lock */
176 struct workqueue_struct *wq;
177
178 struct typec_capability typec_caps;
179 struct typec_port *typec_port;
180
181 struct tcpc_dev *tcpc;
182
183 enum typec_role vconn_role;
184 enum typec_role pwr_role;
185 enum typec_data_role data_role;
186 enum typec_pwr_opmode pwr_opmode;
187
188 struct usb_pd_identity partner_ident;
189 struct typec_partner_desc partner_desc;
190 struct typec_partner *partner;
191
192 enum typec_cc_status cc_req;
193
194 enum typec_cc_status cc1;
195 enum typec_cc_status cc2;
196 enum typec_cc_polarity polarity;
197
198 bool attached;
199 bool connected;
200 bool vbus_present;
201 bool vbus_never_low;
202 bool vbus_source;
203 bool vbus_charge;
204
205 bool send_discover;
206 bool op_vsafe5v;
207
208 int try_role;
209 int try_snk_count;
210 int try_src_count;
211
212 enum pd_msg_request queued_message;
213
214 enum tcpm_state enter_state;
215 enum tcpm_state prev_state;
216 enum tcpm_state state;
217 enum tcpm_state delayed_state;
218 unsigned long delayed_runtime;
219 unsigned long delay_ms;
220
221 spinlock_t pd_event_lock;
222 u32 pd_events;
223
224 struct work_struct event_work;
225 struct delayed_work state_machine;
226 struct delayed_work vdm_state_machine;
227 bool state_machine_running;
228
229 struct completion tx_complete;
230 enum tcpm_transmit_status tx_status;
231
232 struct mutex swap_lock; /* swap command lock */
233 bool swap_pending;
b17dd571 234 bool non_pd_role_swap;
f0690a25
GR		 235 struct completion swap_complete;
236 int swap_status;
237
238 unsigned int message_id;
239 unsigned int caps_count;
240 unsigned int hard_reset_count;
241 bool pd_capable;
242 bool explicit_contract;
5fec4b54 243 unsigned int rx_msgid;
f0690a25
GR		 244
245 /* Partner capabilities/requests */
246 u32 sink_request;
247 u32 source_caps[PDO_MAX_OBJECTS];
248 unsigned int nr_source_caps;
249 u32 sink_caps[PDO_MAX_OBJECTS];
250 unsigned int nr_sink_caps;
251
252 /* Local capabilities */
253 u32 src_pdo[PDO_MAX_OBJECTS];
254 unsigned int nr_src_pdo;
255 u32 snk_pdo[PDO_MAX_OBJECTS];
256 unsigned int nr_snk_pdo;
193a6801
GR		 257 u32 snk_vdo[VDO_MAX_OBJECTS];
258 unsigned int nr_snk_vdo;
f0690a25
GR		 259
260 unsigned int max_snk_mv;
261 unsigned int max_snk_ma;
262 unsigned int max_snk_mw;
263 unsigned int operating_snk_mw;
264
265 /* Requested current / voltage */
266 u32 current_limit;
267 u32 supply_voltage;
268
269 u32 bist_request;
270
271 /* PD state for Vendor Defined Messages */
272 enum vdm_states vdm_state;
273 u32 vdm_retries;
274 /* next Vendor Defined Message to send */
275 u32 vdo_data[VDO_MAX_SIZE];
276 u8 vdo_count;
277 /* VDO to retry if UFP responder replied busy */
278 u32 vdo_retry;
279
280 /* Alternate mode data */
281
282 struct pd_mode_data mode_data;
283 struct typec_altmode *partner_altmode[SVID_DISCOVERY_MAX];
284 struct typec_altmode *port_altmode[SVID_DISCOVERY_MAX];
285
286#ifdef CONFIG_DEBUG_FS
287 struct dentry *dentry;
288 struct mutex logbuffer_lock; /* log buffer access lock */
289 int logbuffer_head;
290 int logbuffer_tail;
291 u8 *logbuffer[LOG_BUFFER_ENTRIES];
292#endif
293};
294
295struct pd_rx_event {
296 struct work_struct work;
297 struct tcpm_port *port;
298 struct pd_message msg;
299};
300
301#define tcpm_cc_is_sink(cc) \
302 ((cc) == TYPEC_CC_RP_DEF || (cc) == TYPEC_CC_RP_1_5 || \
303 (cc) == TYPEC_CC_RP_3_0)
304
305#define tcpm_port_is_sink(port) \
306 ((tcpm_cc_is_sink((port)->cc1) && !tcpm_cc_is_sink((port)->cc2)) || \
307 (tcpm_cc_is_sink((port)->cc2) && !tcpm_cc_is_sink((port)->cc1)))
308
309#define tcpm_cc_is_source(cc) ((cc) == TYPEC_CC_RD)
310#define tcpm_cc_is_audio(cc) ((cc) == TYPEC_CC_RA)
311#define tcpm_cc_is_open(cc) ((cc) == TYPEC_CC_OPEN)
312
313#define tcpm_port_is_source(port) \
314 ((tcpm_cc_is_source((port)->cc1) && \
315 !tcpm_cc_is_source((port)->cc2)) || \
316 (tcpm_cc_is_source((port)->cc2) && \
317 !tcpm_cc_is_source((port)->cc1)))
318
319#define tcpm_port_is_debug(port) \
320 (tcpm_cc_is_source((port)->cc1) && tcpm_cc_is_source((port)->cc2))
321
322#define tcpm_port_is_audio(port) \
323 (tcpm_cc_is_audio((port)->cc1) && tcpm_cc_is_audio((port)->cc2))
324
325#define tcpm_port_is_audio_detached(port) \
326 ((tcpm_cc_is_audio((port)->cc1) && tcpm_cc_is_open((port)->cc2)) || \
327 (tcpm_cc_is_audio((port)->cc2) && tcpm_cc_is_open((port)->cc1)))
328
329#define tcpm_try_snk(port) \
330 ((port)->try_snk_count == 0 && (port)->try_role == TYPEC_SINK)
331
332#define tcpm_try_src(port) \
333 ((port)->try_src_count == 0 && (port)->try_role == TYPEC_SOURCE)
334
335static enum tcpm_state tcpm_default_state(struct tcpm_port *port)
336{
b46a9c90
BJS		 337 if (port->typec_caps.type == TYPEC_PORT_DRP) {
338 if (port->try_role == TYPEC_SINK)
339 return SNK_UNATTACHED;
340 else if (port->try_role == TYPEC_SOURCE)
341 return SRC_UNATTACHED;
342 else if (port->tcpc->config->default_role == TYPEC_SINK)
343 return SNK_UNATTACHED;
344 /* Fall through to return SRC_UNATTACHED */
345 } else if (port->typec_caps.type == TYPEC_PORT_UFP) {
f0690a25 346 return SNK_UNATTACHED;
b46a9c90 347 }
f0690a25
GR		 348 return SRC_UNATTACHED;
349}
350
351static inline
352struct tcpm_port *typec_cap_to_tcpm(const struct typec_capability *cap)
353{
354 return container_of(cap, struct tcpm_port, typec_caps);
355}
356
357static bool tcpm_port_is_disconnected(struct tcpm_port *port)
358{
359 return (!port->attached && port->cc1 == TYPEC_CC_OPEN &&
360 port->cc2 == TYPEC_CC_OPEN) ||
361 (port->attached && ((port->polarity == TYPEC_POLARITY_CC1 &&
362 port->cc1 == TYPEC_CC_OPEN) ||
363 (port->polarity == TYPEC_POLARITY_CC2 &&
364 port->cc2 == TYPEC_CC_OPEN)));
365}
366
367/*
368 * Logging
369 */
370
371#ifdef CONFIG_DEBUG_FS
372
373static bool tcpm_log_full(struct tcpm_port *port)
374{
375 return port->logbuffer_tail ==
376 (port->logbuffer_head + 1) % LOG_BUFFER_ENTRIES;
377}
378
379static void _tcpm_log(struct tcpm_port *port, const char *fmt, va_list args)
380{
381 char tmpbuffer[LOG_BUFFER_ENTRY_SIZE];
382 u64 ts_nsec = local_clock();
383 unsigned long rem_nsec;
384
385 if (!port->logbuffer[port->logbuffer_head]) {
386 port->logbuffer[port->logbuffer_head] =
387 kzalloc(LOG_BUFFER_ENTRY_SIZE, GFP_KERNEL);
388 if (!port->logbuffer[port->logbuffer_head])
389 return;
390 }
391
392 vsnprintf(tmpbuffer, sizeof(tmpbuffer), fmt, args);
393
394 mutex_lock(&port->logbuffer_lock);
395
396 if (tcpm_log_full(port)) {
397 port->logbuffer_head = max(port->logbuffer_head - 1, 0);
398 strcpy(tmpbuffer, "overflow");
399 }
400
401 if (port->logbuffer_head < 0 ||
402 port->logbuffer_head >= LOG_BUFFER_ENTRIES) {
403 dev_warn(port->dev,
404 "Bad log buffer index %d\n", port->logbuffer_head);
405 goto abort;
406 }
407
408 if (!port->logbuffer[port->logbuffer_head]) {
409 dev_warn(port->dev,
410 "Log buffer index %d is NULL\n", port->logbuffer_head);
411 goto abort;
412 }
413
414 rem_nsec = do_div(ts_nsec, 1000000000);
415 scnprintf(port->logbuffer[port->logbuffer_head],
416 LOG_BUFFER_ENTRY_SIZE, "[%5lu.%06lu] %s",
417 (unsigned long)ts_nsec, rem_nsec / 1000,
418 tmpbuffer);
419 port->logbuffer_head = (port->logbuffer_head + 1) % LOG_BUFFER_ENTRIES;
420
421abort:
422 mutex_unlock(&port->logbuffer_lock);
423}
424
425static void tcpm_log(struct tcpm_port *port, const char *fmt, ...)
426{
427 va_list args;
428
429 /* Do not log while disconnected and unattached */
430 if (tcpm_port_is_disconnected(port) &&
431 (port->state == SRC_UNATTACHED || port->state == SNK_UNATTACHED ||
432 port->state == DRP_TOGGLING))
433 return;
434
435 va_start(args, fmt);
436 _tcpm_log(port, fmt, args);
437 va_end(args);
438}
439
440static void tcpm_log_force(struct tcpm_port *port, const char *fmt, ...)
441{
442 va_list args;
443
444 va_start(args, fmt);
445 _tcpm_log(port, fmt, args);
446 va_end(args);
447}
448
449static void tcpm_log_source_caps(struct tcpm_port *port)
450{
451 int i;
452
453 for (i = 0; i < port->nr_source_caps; i++) {
454 u32 pdo = port->source_caps[i];
455 enum pd_pdo_type type = pdo_type(pdo);
456 char msg[64];
457
458 switch (type) {
459 case PDO_TYPE_FIXED:
460 scnprintf(msg, sizeof(msg),
461 "%u mV, %u mA [%s%s%s%s%s%s]",
462 pdo_fixed_voltage(pdo),
463 pdo_max_current(pdo),
464 (pdo & PDO_FIXED_DUAL_ROLE) ?
465 "R" : "",
466 (pdo & PDO_FIXED_SUSPEND) ?
467 "S" : "",
468 (pdo & PDO_FIXED_HIGHER_CAP) ?
469 "H" : "",
470 (pdo & PDO_FIXED_USB_COMM) ?
471 "U" : "",
472 (pdo & PDO_FIXED_DATA_SWAP) ?
473 "D" : "",
474 (pdo & PDO_FIXED_EXTPOWER) ?
475 "E" : "");
476 break;
477 case PDO_TYPE_VAR:
478 scnprintf(msg, sizeof(msg),
479 "%u-%u mV, %u mA",
480 pdo_min_voltage(pdo),
481 pdo_max_voltage(pdo),
482 pdo_max_current(pdo));
483 break;
484 case PDO_TYPE_BATT:
485 scnprintf(msg, sizeof(msg),
486 "%u-%u mV, %u mW",
487 pdo_min_voltage(pdo),
488 pdo_max_voltage(pdo),
489 pdo_max_power(pdo));
490 break;
491 default:
492 strcpy(msg, "undefined");
493 break;
494 }
495 tcpm_log(port, " PDO %d: type %d, %s",
496 i, type, msg);
497 }
498}
499
500static int tcpm_seq_show(struct seq_file *s, void *v)
501{
502 struct tcpm_port *port = (struct tcpm_port *)s->private;
503 int tail;
504
505 mutex_lock(&port->logbuffer_lock);
506 tail = port->logbuffer_tail;
507 while (tail != port->logbuffer_head) {
508 seq_printf(s, "%s\n", port->logbuffer[tail]);
509 tail = (tail + 1) % LOG_BUFFER_ENTRIES;
510 }
511 if (!seq_has_overflowed(s))
512 port->logbuffer_tail = tail;
513 mutex_unlock(&port->logbuffer_lock);
514
515 return 0;
516}
517
518static int tcpm_debug_open(struct inode *inode, struct file *file)
519{
520 return single_open(file, tcpm_seq_show, inode->i_private);
521}
522
523static const struct file_operations tcpm_debug_operations = {
524 .open = tcpm_debug_open,
525 .llseek = seq_lseek,
526 .read = seq_read,
527 .release = single_release,
528};
529
530static struct dentry *rootdir;
531
532static int tcpm_debugfs_init(struct tcpm_port *port)
533{
534 mutex_init(&port->logbuffer_lock);
535 /* /sys/kernel/debug/tcpm/usbcX */
536 if (!rootdir) {
537 rootdir = debugfs_create_dir("tcpm", NULL);
538 if (!rootdir)
539 return -ENOMEM;
540 }
541
542 port->dentry = debugfs_create_file(dev_name(port->dev),
543 S_IFREG | 0444, rootdir,
544 port, &tcpm_debug_operations);
545
546 return 0;
547}
548
549static void tcpm_debugfs_exit(struct tcpm_port *port)
550{
551 debugfs_remove(port->dentry);
552}
553
554#else
555
556static void tcpm_log(const struct tcpm_port *port, const char *fmt, ...) { }
557static void tcpm_log_force(struct tcpm_port *port, const char *fmt, ...) { }
558static void tcpm_log_source_caps(struct tcpm_port *port) { }
559static int tcpm_debugfs_init(const struct tcpm_port *port) { return 0; }
560static void tcpm_debugfs_exit(const struct tcpm_port *port) { }
561
562#endif
563
564static int tcpm_pd_transmit(struct tcpm_port *port,
565 enum tcpm_transmit_type type,
566 const struct pd_message *msg)
567{
568 unsigned long timeout;
569 int ret;
570
571 if (msg)
572 tcpm_log(port, "PD TX, header: %#x", le16_to_cpu(msg->header));
573 else
574 tcpm_log(port, "PD TX, type: %#x", type);
575
576 reinit_completion(&port->tx_complete);
577 ret = port->tcpc->pd_transmit(port->tcpc, type, msg);
578 if (ret < 0)
579 return ret;
580
581 mutex_unlock(&port->lock);
582 timeout = wait_for_completion_timeout(&port->tx_complete,
583 msecs_to_jiffies(PD_T_TCPC_TX_TIMEOUT));
584 mutex_lock(&port->lock);
585 if (!timeout)
586 return -ETIMEDOUT;
587
588 switch (port->tx_status) {
589 case TCPC_TX_SUCCESS:
590 port->message_id = (port->message_id + 1) & PD_HEADER_ID_MASK;
591 return 0;
592 case TCPC_TX_DISCARDED:
593 return -EAGAIN;
594 case TCPC_TX_FAILED:
595 default:
596 return -EIO;
597 }
598}
599
600void tcpm_pd_transmit_complete(struct tcpm_port *port,
601 enum tcpm_transmit_status status)
602{
603 tcpm_log(port, "PD TX complete, status: %u", status);
604 port->tx_status = status;
605 complete(&port->tx_complete);
606}
607EXPORT_SYMBOL_GPL(tcpm_pd_transmit_complete);
608
609static int tcpm_mux_set(struct tcpm_port *port, enum tcpc_mux_mode mode,
610 enum tcpc_usb_switch config)
611{
612 int ret = 0;
613
614 tcpm_log(port, "Requesting mux mode %d, config %d, polarity %d",
615 mode, config, port->polarity);
616
617 if (port->tcpc->mux)
618 ret = port->tcpc->mux->set(port->tcpc->mux, mode, config,
619 port->polarity);
620
621 return ret;
622}
623
624static int tcpm_set_polarity(struct tcpm_port *port,
625 enum typec_cc_polarity polarity)
626{
627 int ret;
628
629 tcpm_log(port, "polarity %d", polarity);
630
631 ret = port->tcpc->set_polarity(port->tcpc, polarity);
632 if (ret < 0)
633 return ret;
634
635 port->polarity = polarity;
636
637 return 0;
638}
639
640static int tcpm_set_vconn(struct tcpm_port *port, bool enable)
641{
642 int ret;
643
644 tcpm_log(port, "vconn:=%d", enable);
645
646 ret = port->tcpc->set_vconn(port->tcpc, enable);
647 if (!ret) {
648 port->vconn_role = enable ? TYPEC_SOURCE : TYPEC_SINK;
649 typec_set_vconn_role(port->typec_port, port->vconn_role);
650 }
651
652 return ret;
653}
654
655static u32 tcpm_get_current_limit(struct tcpm_port *port)
656{
657 enum typec_cc_status cc;
658 u32 limit;
659
660 cc = port->polarity ? port->cc2 : port->cc1;
661 switch (cc) {
662 case TYPEC_CC_RP_1_5:
663 limit = 1500;
664 break;
665 case TYPEC_CC_RP_3_0:
666 limit = 3000;
667 break;
668 case TYPEC_CC_RP_DEF:
669 default:
670 limit = 0;
671 break;
672 }
673
674 return limit;
675}
676
677static int tcpm_set_current_limit(struct tcpm_port *port, u32 max_ma, u32 mv)
678{
679 int ret = -EOPNOTSUPP;
680
681 tcpm_log(port, "Setting voltage/current limit %u mV %u mA", mv, max_ma);
682
683 if (port->tcpc->set_current_limit)
684 ret = port->tcpc->set_current_limit(port->tcpc, max_ma, mv);
685
686 return ret;
687}
688
689/*
690 * Determine RP value to set based on maximum current supported
691 * by a port if configured as source.
692 * Returns CC value to report to link partner.
693 */
694static enum typec_cc_status tcpm_rp_cc(struct tcpm_port *port)
695{
696 const u32 *src_pdo = port->src_pdo;
697 int nr_pdo = port->nr_src_pdo;
698 int i;
699
700 /*
701 * Search for first entry with matching voltage.
702 * It should report the maximum supported current.
703 */
704 for (i = 0; i < nr_pdo; i++) {
705 const u32 pdo = src_pdo[i];
706
707 if (pdo_type(pdo) == PDO_TYPE_FIXED &&
708 pdo_fixed_voltage(pdo) == 5000) {
709 unsigned int curr = pdo_max_current(pdo);
710
711 if (curr >= 3000)
712 return TYPEC_CC_RP_3_0;
713 else if (curr >= 1500)
714 return TYPEC_CC_RP_1_5;
715 return TYPEC_CC_RP_DEF;
716 }
717 }
718
719 return TYPEC_CC_RP_DEF;
720}
721
722static int tcpm_set_attached_state(struct tcpm_port *port, bool attached)
723{
724 return port->tcpc->set_roles(port->tcpc, attached, port->pwr_role,
725 port->data_role);
726}
727
728static int tcpm_set_roles(struct tcpm_port *port, bool attached,
729 enum typec_role role, enum typec_data_role data)
730{
731 int ret;
732
733 if (data == TYPEC_HOST)
734 ret = tcpm_mux_set(port, TYPEC_MUX_USB,
735 TCPC_USB_SWITCH_CONNECT);
736 else
737 ret = tcpm_mux_set(port, TYPEC_MUX_NONE,
738 TCPC_USB_SWITCH_DISCONNECT);
739 if (ret < 0)
740 return ret;
741
742 ret = port->tcpc->set_roles(port->tcpc, attached, role, data);
743 if (ret < 0)
744 return ret;
745
746 port->pwr_role = role;
747 port->data_role = data;
748 typec_set_data_role(port->typec_port, data);
749 typec_set_pwr_role(port->typec_port, role);
750
751 return 0;
752}
753
754static int tcpm_set_pwr_role(struct tcpm_port *port, enum typec_role role)
755{
756 int ret;
757
758 ret = port->tcpc->set_roles(port->tcpc, true, role,
759 port->data_role);
760 if (ret < 0)
761 return ret;
762
763 port->pwr_role = role;
764 typec_set_pwr_role(port->typec_port, role);
765
766 return 0;
767}
768
769static int tcpm_pd_send_source_caps(struct tcpm_port *port)
770{
771 struct pd_message msg;
772 int i;
773
774 memset(&msg, 0, sizeof(msg));
775 if (!port->nr_src_pdo) {
776 /* No source capabilities defined, sink only */
777 msg.header = PD_HEADER_LE(PD_CTRL_REJECT,
778 port->pwr_role,
779 port->data_role,
780 port->message_id, 0);
781 } else {
782 msg.header = PD_HEADER_LE(PD_DATA_SOURCE_CAP,
783 port->pwr_role,
784 port->data_role,
785 port->message_id,
786 port->nr_src_pdo);
787 }
788 for (i = 0; i < port->nr_src_pdo; i++)
789 msg.payload[i] = cpu_to_le32(port->src_pdo[i]);
790
791 return tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
792}
793
794static int tcpm_pd_send_sink_caps(struct tcpm_port *port)
795{
796 struct pd_message msg;
797 int i;
798
799 memset(&msg, 0, sizeof(msg));
800 if (!port->nr_snk_pdo) {
801 /* No sink capabilities defined, source only */
802 msg.header = PD_HEADER_LE(PD_CTRL_REJECT,
803 port->pwr_role,
804 port->data_role,
805 port->message_id, 0);
806 } else {
807 msg.header = PD_HEADER_LE(PD_DATA_SINK_CAP,
808 port->pwr_role,
809 port->data_role,
810 port->message_id,
811 port->nr_snk_pdo);
812 }
813 for (i = 0; i < port->nr_snk_pdo; i++)
814 msg.payload[i] = cpu_to_le32(port->snk_pdo[i]);
815
816 return tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
817}
818
819static void tcpm_set_state(struct tcpm_port *port, enum tcpm_state state,
820 unsigned int delay_ms)
821{
822 if (delay_ms) {
823 tcpm_log(port, "pending state change %s -> %s @ %u ms",
824 tcpm_states[port->state], tcpm_states[state],
825 delay_ms);
826 port->delayed_state = state;
827 mod_delayed_work(port->wq, &port->state_machine,
828 msecs_to_jiffies(delay_ms));
829 port->delayed_runtime = jiffies + msecs_to_jiffies(delay_ms);
830 port->delay_ms = delay_ms;
831 } else {
832 tcpm_log(port, "state change %s -> %s",
833 tcpm_states[port->state], tcpm_states[state]);
834 port->delayed_state = INVALID_STATE;
835 port->prev_state = port->state;
836 port->state = state;
837 /*
838 * Don't re-queue the state machine work item if we're currently
839 * in the state machine and we're immediately changing states.
840 * tcpm_state_machine_work() will continue running the state
841 * machine.
842 */
843 if (!port->state_machine_running)
844 mod_delayed_work(port->wq, &port->state_machine, 0);
845 }
846}
847
848static void tcpm_set_state_cond(struct tcpm_port *port, enum tcpm_state state,
849 unsigned int delay_ms)
850{
851 if (port->enter_state == port->state)
852 tcpm_set_state(port, state, delay_ms);
853 else
854 tcpm_log(port,
855 "skipped %sstate change %s -> %s [%u ms], context state %s",
856 delay_ms ? "delayed " : "",
857 tcpm_states[port->state], tcpm_states[state],
858 delay_ms, tcpm_states[port->enter_state]);
859}
860
861static void tcpm_queue_message(struct tcpm_port *port,
862 enum pd_msg_request message)
863{
864 port->queued_message = message;
865 mod_delayed_work(port->wq, &port->state_machine, 0);
866}
867
868/*
869 * VDM/VDO handling functions
870 */
871static void tcpm_queue_vdm(struct tcpm_port *port, const u32 header,
872 const u32 *data, int cnt)
873{
874 port->vdo_count = cnt + 1;
875 port->vdo_data[0] = header;
876 memcpy(&port->vdo_data[1], data, sizeof(u32) * cnt);
877 /* Set ready, vdm state machine will actually send */
878 port->vdm_retries = 0;
879 port->vdm_state = VDM_STATE_READY;
880}
881
882static void svdm_consume_identity(struct tcpm_port *port, const __le32 *payload,
883 int cnt)
884{
885 u32 vdo = le32_to_cpu(payload[VDO_INDEX_IDH]);
886 u32 product = le32_to_cpu(payload[VDO_INDEX_PRODUCT]);
887
888 memset(&port->mode_data, 0, sizeof(port->mode_data));
889
890#if 0 /* Not really a match */
891 switch (PD_IDH_PTYPE(vdo)) {
892 case IDH_PTYPE_UNDEF:
893 port->partner.type = TYPEC_PARTNER_NONE; /* no longer exists */
894 break;
895 case IDH_PTYPE_HUB:
896 break;
897 case IDH_PTYPE_PERIPH:
898 break;
899 case IDH_PTYPE_PCABLE:
900 break;
901 case IDH_PTYPE_ACABLE:
902 break;
903 case IDH_PTYPE_AMA:
904 port->partner.type = TYPEC_PARTNER_ALTMODE;
905 break;
906 default:
907 break;
908 }
909#endif
910
911 port->partner_ident.id_header = vdo;
912 port->partner_ident.cert_stat = le32_to_cpu(payload[VDO_INDEX_CSTAT]);
913 port->partner_ident.product = product;
914
915 typec_partner_set_identity(port->partner);
916
917 tcpm_log(port, "Identity: %04x:%04x.%04x",
918 PD_IDH_VID(vdo),
919 PD_PRODUCT_PID(product), product & 0xffff);
920}
921
922static bool svdm_consume_svids(struct tcpm_port *port, const __le32 *payload,
923 int cnt)
924{
925 struct pd_mode_data *pmdata = &port->mode_data;
926 int i;
927
928 for (i = 1; i < cnt; i++) {
929 u32 p = le32_to_cpu(payload[i]);
930 u16 svid;
931
932 svid = (p >> 16) & 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 svid = p & 0xffff;
943 if (!svid)
944 return false;
945
946 if (pmdata->nsvids >= SVID_DISCOVERY_MAX)
947 goto abort;
948
949 pmdata->svids[pmdata->nsvids++] = svid;
950 tcpm_log(port, "SVID %d: 0x%x", pmdata->nsvids, svid);
951 }
952 return true;
953abort:
954 tcpm_log(port, "SVID_DISCOVERY_MAX(%d) too low!", SVID_DISCOVERY_MAX);
955 return false;
956}
957
958static void svdm_consume_modes(struct tcpm_port *port, const __le32 *payload,
959 int cnt)
960{
961 struct pd_mode_data *pmdata = &port->mode_data;
962 struct typec_altmode_desc *paltmode;
963 struct typec_mode_desc *pmode;
964 int i;
965
966 if (pmdata->altmodes >= ARRAY_SIZE(port->partner_altmode)) {
967 /* Already logged in svdm_consume_svids() */
968 return;
969 }
970
971 paltmode = &pmdata->altmode_desc[pmdata->altmodes];
972 memset(paltmode, 0, sizeof(*paltmode));
973
974 paltmode->svid = pmdata->svids[pmdata->svid_index];
975
976 tcpm_log(port, " Alternate mode %d: SVID 0x%04x",
977 pmdata->altmodes, paltmode->svid);
978
979 for (i = 1; i < cnt && paltmode->n_modes < ALTMODE_MAX_MODES; i++) {
980 pmode = &paltmode->modes[paltmode->n_modes];
981 memset(pmode, 0, sizeof(*pmode));
982 pmode->vdo = le32_to_cpu(payload[i]);
983 pmode->index = i - 1;
984 paltmode->n_modes++;
985 tcpm_log(port, " VDO %d: 0x%08x",
986 pmode->index, pmode->vdo);
987 }
988 port->partner_altmode[pmdata->altmodes] =
989 typec_partner_register_altmode(port->partner, paltmode);
990 if (port->partner_altmode[pmdata->altmodes] == NULL) {
991 tcpm_log(port,
992 "Failed to register alternate modes for SVID 0x%04x",
993 paltmode->svid);
994 return;
995 }
996 pmdata->altmodes++;
997}
998
999#define supports_modal(port) PD_IDH_MODAL_SUPP((port)->partner_ident.id_header)
1000
1001static int tcpm_pd_svdm(struct tcpm_port *port, const __le32 *payload, int cnt,
1002 u32 *response)
1003{
1004 u32 p0 = le32_to_cpu(payload[0]);
1005 int cmd_type = PD_VDO_CMDT(p0);
1006 int cmd = PD_VDO_CMD(p0);
1007 struct pd_mode_data *modep;
1008 int rlen = 0;
1009 u16 svid;
193a6801 1010 int i;
f0690a25
GR		 1011
1012 tcpm_log(port, "Rx VDM cmd 0x%x type %d cmd %d len %d",
1013 p0, cmd_type, cmd, cnt);
1014
1015 modep = &port->mode_data;
1016
1017 switch (cmd_type) {
1018 case CMDT_INIT:
1019 switch (cmd) {
1020 case CMD_DISCOVER_IDENT:
193a6801
GR		 1021 /* 6.4.4.3.1: Only respond as UFP (device) */
1022 if (port->data_role == TYPEC_DEVICE &&
1023 port->nr_snk_vdo) {
1024 for (i = 0; i < port->nr_snk_vdo; i++)
cbe5843e 1025 response[i + 1] = port->snk_vdo[i];
193a6801
GR		 1026 rlen = port->nr_snk_vdo + 1;
1027 }
f0690a25
GR		 1028 break;
1029 case CMD_DISCOVER_SVID:
1030 break;
1031 case CMD_DISCOVER_MODES:
1032 break;
1033 case CMD_ENTER_MODE:
1034 break;
1035 case CMD_EXIT_MODE:
1036 break;
1037 case CMD_ATTENTION:
1038 break;
1039 default:
1040 break;
1041 }
1042 if (rlen >= 1) {
1043 response[0] = p0 | VDO_CMDT(CMDT_RSP_ACK);
1044 } else if (rlen == 0) {
1045 response[0] = p0 | VDO_CMDT(CMDT_RSP_NAK);
1046 rlen = 1;
1047 } else {
1048 response[0] = p0 | VDO_CMDT(CMDT_RSP_BUSY);
1049 rlen = 1;
1050 }
1051 break;
1052 case CMDT_RSP_ACK:
1053 /* silently drop message if we are not connected */
1054 if (!port->partner)
1055 break;
1056
1057 switch (cmd) {
1058 case CMD_DISCOVER_IDENT:
1059 /* 6.4.4.3.1 */
1060 svdm_consume_identity(port, payload, cnt);
1061 response[0] = VDO(USB_SID_PD, 1, CMD_DISCOVER_SVID);
1062 rlen = 1;
1063 break;
1064 case CMD_DISCOVER_SVID:
1065 /* 6.4.4.3.2 */
1066 if (svdm_consume_svids(port, payload, cnt)) {
1067 response[0] = VDO(USB_SID_PD, 1,
1068 CMD_DISCOVER_SVID);
1069 rlen = 1;
1070 } else if (modep->nsvids && supports_modal(port)) {
1071 response[0] = VDO(modep->svids[0], 1,
1072 CMD_DISCOVER_MODES);
1073 rlen = 1;
1074 }
1075 break;
1076 case CMD_DISCOVER_MODES:
1077 /* 6.4.4.3.3 */
1078 svdm_consume_modes(port, payload, cnt);
1079 modep->svid_index++;
1080 if (modep->svid_index < modep->nsvids) {
1081 svid = modep->svids[modep->svid_index];
1082 response[0] = VDO(svid, 1, CMD_DISCOVER_MODES);
1083 rlen = 1;
1084 } else {
1085#if 0
1086 response[0] = pd_dfp_enter_mode(port, 0, 0);
1087 if (response[0])
1088 rlen = 1;
1089#endif
1090 }
1091 break;
1092 case CMD_ENTER_MODE:
1093 break;
1094 default:
1095 break;
1096 }
1097 break;
1098 default:
1099 break;
1100 }
1101
1102 return rlen;
1103}
1104
1105static void tcpm_handle_vdm_request(struct tcpm_port *port,
1106 const __le32 *payload, int cnt)
1107{
1108 int rlen = 0;
1109 u32 response[8] = { };
1110 u32 p0 = le32_to_cpu(payload[0]);
1111
1112 if (port->vdm_state == VDM_STATE_BUSY) {
1113 /* If UFP responded busy retry after timeout */
1114 if (PD_VDO_CMDT(p0) == CMDT_RSP_BUSY) {
1115 port->vdm_state = VDM_STATE_WAIT_RSP_BUSY;
1116 port->vdo_retry = (p0 & ~VDO_CMDT_MASK) |
1117 CMDT_INIT;
1118 mod_delayed_work(port->wq, &port->vdm_state_machine,
1119 msecs_to_jiffies(PD_T_VDM_BUSY));
1120 return;
1121 }
1122 port->vdm_state = VDM_STATE_DONE;
1123 }
1124
1125 if (PD_VDO_SVDM(p0))
1126 rlen = tcpm_pd_svdm(port, payload, cnt, response);
1127#if 0
1128 else
1129 rlen = tcpm_pd_custom_vdm(port, cnt, payload, response);
1130#endif
1131
1132 if (rlen > 0) {
1133 tcpm_queue_vdm(port, response[0], &response[1], rlen - 1);
1134 mod_delayed_work(port->wq, &port->vdm_state_machine, 0);
1135 }
1136}
1137
1138static void tcpm_send_vdm(struct tcpm_port *port, u32 vid, int cmd,
1139 const u32 *data, int count)
1140{
1141 u32 header;
1142
1143 if (WARN_ON(count > VDO_MAX_SIZE - 1))
1144 count = VDO_MAX_SIZE - 1;
1145
1146 /* set VDM header with VID & CMD */
1147 header = VDO(vid, ((vid & USB_SID_PD) == USB_SID_PD) ?
1148 1 : (PD_VDO_CMD(cmd) <= CMD_ATTENTION), cmd);
1149 tcpm_queue_vdm(port, header, data, count);
1150
1151 mod_delayed_work(port->wq, &port->vdm_state_machine, 0);
1152}
1153
1154static unsigned int vdm_ready_timeout(u32 vdm_hdr)
1155{
1156 unsigned int timeout;
1157 int cmd = PD_VDO_CMD(vdm_hdr);
1158
1159 /* its not a structured VDM command */
1160 if (!PD_VDO_SVDM(vdm_hdr))
1161 return PD_T_VDM_UNSTRUCTURED;
1162
1163 switch (PD_VDO_CMDT(vdm_hdr)) {
1164 case CMDT_INIT:
1165 if (cmd == CMD_ENTER_MODE || cmd == CMD_EXIT_MODE)
1166 timeout = PD_T_VDM_WAIT_MODE_E;
1167 else
1168 timeout = PD_T_VDM_SNDR_RSP;
1169 break;
1170 default:
1171 if (cmd == CMD_ENTER_MODE || cmd == CMD_EXIT_MODE)
1172 timeout = PD_T_VDM_E_MODE;
1173 else
1174 timeout = PD_T_VDM_RCVR_RSP;
1175 break;
1176 }
1177 return timeout;
1178}
1179
1180static void vdm_run_state_machine(struct tcpm_port *port)
1181{
1182 struct pd_message msg;
1183 int i, res;
1184
1185 switch (port->vdm_state) {
1186 case VDM_STATE_READY:
1187 /* Only transmit VDM if attached */
1188 if (!port->attached) {
1189 port->vdm_state = VDM_STATE_ERR_BUSY;
1190 break;
1191 }
1192
1193 /*
1194 * if there's traffic or we're not in PDO ready state don't send
1195 * a VDM.
1196 */
1197 if (port->state != SRC_READY && port->state != SNK_READY)
1198 break;
1199
1200 /* Prepare and send VDM */
1201 memset(&msg, 0, sizeof(msg));
1202 msg.header = PD_HEADER_LE(PD_DATA_VENDOR_DEF,
1203 port->pwr_role,
1204 port->data_role,
1205 port->message_id, port->vdo_count);
1206 for (i = 0; i < port->vdo_count; i++)
1207 msg.payload[i] = cpu_to_le32(port->vdo_data[i]);
1208 res = tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
1209 if (res < 0) {
1210 port->vdm_state = VDM_STATE_ERR_SEND;
1211 } else {
1212 unsigned long timeout;
1213
1214 port->vdm_retries = 0;
1215 port->vdm_state = VDM_STATE_BUSY;
1216 timeout = vdm_ready_timeout(port->vdo_data[0]);
1217 mod_delayed_work(port->wq, &port->vdm_state_machine,
1218 timeout);
1219 }
1220 break;
1221 case VDM_STATE_WAIT_RSP_BUSY:
1222 port->vdo_data[0] = port->vdo_retry;
1223 port->vdo_count = 1;
1224 port->vdm_state = VDM_STATE_READY;
1225 break;
1226 case VDM_STATE_BUSY:
1227 port->vdm_state = VDM_STATE_ERR_TMOUT;
1228 break;
1229 case VDM_STATE_ERR_SEND:
1230 /*
1231 * A partner which does not support USB PD will not reply,
1232 * so this is not a fatal error. At the same time, some
1233 * devices may not return GoodCRC under some circumstances,
1234 * so we need to retry.
1235 */
1236 if (port->vdm_retries < 3) {
1237 tcpm_log(port, "VDM Tx error, retry");
1238 port->vdm_retries++;
1239 port->vdm_state = VDM_STATE_READY;
1240 }
1241 break;
1242 default:
1243 break;
1244 }
1245}
1246
1247static void vdm_state_machine_work(struct work_struct *work)
1248{
1249 struct tcpm_port *port = container_of(work, struct tcpm_port,
1250 vdm_state_machine.work);
1251 enum vdm_states prev_state;
1252
1253 mutex_lock(&port->lock);
1254
1255 /*
1256 * Continue running as long as the port is not busy and there was
1257 * a state change.
1258 */
1259 do {
1260 prev_state = port->vdm_state;
1261 vdm_run_state_machine(port);
1262 } while (port->vdm_state != prev_state &&
1263 port->vdm_state != VDM_STATE_BUSY);
1264
1265 mutex_unlock(&port->lock);
1266}
1267
1268/*
1269 * PD (data, control) command handling functions
1270 */
1271static void tcpm_pd_data_request(struct tcpm_port *port,
1272 const struct pd_message *msg)
1273{
1274 enum pd_data_msg_type type = pd_header_type_le(msg->header);
1275 unsigned int cnt = pd_header_cnt_le(msg->header);
1276 unsigned int i;
1277
1278 switch (type) {
1279 case PD_DATA_SOURCE_CAP:
1280 if (port->pwr_role != TYPEC_SINK)
1281 break;
1282
1283 for (i = 0; i < cnt; i++)
1284 port->source_caps[i] = le32_to_cpu(msg->payload[i]);
1285
1286 port->nr_source_caps = cnt;
1287
1288 tcpm_log_source_caps(port);
1289
1290 /*
1291 * This message may be received even if VBUS is not
1292 * present. This is quite unexpected; see USB PD
1293 * specification, sections 8.3.3.6.3.1 and 8.3.3.6.3.2.
1294 * However, at the same time, we must be ready to
1295 * receive this message and respond to it 15ms after
1296 * receiving PS_RDY during power swap operations, no matter
1297 * if VBUS is available or not (USB PD specification,
1298 * section 6.5.9.2).
1299 * So we need to accept the message either way,
1300 * but be prepared to keep waiting for VBUS after it was
1301 * handled.
1302 */
1303 tcpm_set_state(port, SNK_NEGOTIATE_CAPABILITIES, 0);
1304 break;
1305 case PD_DATA_REQUEST:
1306 if (port->pwr_role != TYPEC_SOURCE ||
1307 cnt != 1) {
1308 tcpm_queue_message(port, PD_MSG_CTRL_REJECT);
1309 break;
1310 }
1311 port->sink_request = le32_to_cpu(msg->payload[0]);
1312 tcpm_set_state(port, SRC_NEGOTIATE_CAPABILITIES, 0);
1313 break;
1314 case PD_DATA_SINK_CAP:
1315 /* We don't do anything with this at the moment... */
1316 for (i = 0; i < cnt; i++)
1317 port->sink_caps[i] = le32_to_cpu(msg->payload[i]);
1318 port->nr_sink_caps = cnt;
1319 break;
1320 case PD_DATA_VENDOR_DEF:
1321 tcpm_handle_vdm_request(port, msg->payload, cnt);
1322 break;
1323 case PD_DATA_BIST:
1324 if (port->state == SRC_READY || port->state == SNK_READY) {
1325 port->bist_request = le32_to_cpu(msg->payload[0]);
1326 tcpm_set_state(port, BIST_RX, 0);
1327 }
1328 break;
1329 default:
1330 tcpm_log(port, "Unhandled data message type %#x", type);
1331 break;
1332 }
1333}
1334
1335static void tcpm_pd_ctrl_request(struct tcpm_port *port,
1336 const struct pd_message *msg)
1337{
1338 enum pd_ctrl_msg_type type = pd_header_type_le(msg->header);
1339 enum tcpm_state next_state;
1340
1341 switch (type) {
1342 case PD_CTRL_GOOD_CRC:
1343 case PD_CTRL_PING:
1344 break;
1345 case PD_CTRL_GET_SOURCE_CAP:
1346 switch (port->state) {
1347 case SRC_READY:
1348 case SNK_READY:
1349 tcpm_queue_message(port, PD_MSG_DATA_SOURCE_CAP);
1350 break;
1351 default:
1352 tcpm_queue_message(port, PD_MSG_CTRL_REJECT);
1353 break;
1354 }
1355 break;
1356 case PD_CTRL_GET_SINK_CAP:
1357 switch (port->state) {
1358 case SRC_READY:
1359 case SNK_READY:
1360 tcpm_queue_message(port, PD_MSG_DATA_SINK_CAP);
1361 break;
1362 default:
1363 tcpm_queue_message(port, PD_MSG_CTRL_REJECT);
1364 break;
1365 }
1366 break;
1367 case PD_CTRL_GOTO_MIN:
1368 break;
1369 case PD_CTRL_PS_RDY:
1370 switch (port->state) {
1371 case SNK_TRANSITION_SINK:
1372 if (port->vbus_present) {
1373 tcpm_set_current_limit(port,
1374 port->current_limit,
1375 port->supply_voltage);
1376 tcpm_set_state(port, SNK_READY, 0);
1377 } else {
1378 /*
1379 * Seen after power swap. Keep waiting for VBUS
1380 * in a transitional state.
1381 */
1382 tcpm_set_state(port,
1383 SNK_TRANSITION_SINK_VBUS, 0);
1384 }
1385 break;
1386 case PR_SWAP_SRC_SNK_SOURCE_OFF:
1387 tcpm_set_state(port, PR_SWAP_SRC_SNK_SINK_ON, 0);
1388 break;
1389 case PR_SWAP_SNK_SRC_SINK_OFF:
1390 tcpm_set_state(port, PR_SWAP_SNK_SRC_SOURCE_ON, 0);
1391 break;
1392 case VCONN_SWAP_WAIT_FOR_VCONN:
1393 tcpm_set_state(port, VCONN_SWAP_TURN_OFF_VCONN, 0);
1394 break;
1395 default:
1396 break;
1397 }
1398 break;
1399 case PD_CTRL_REJECT:
1400 case PD_CTRL_WAIT:
1401 switch (port->state) {
1402 case SNK_NEGOTIATE_CAPABILITIES:
1403 /* USB PD specification, Figure 8-43 */
1404 if (port->explicit_contract)
1405 next_state = SNK_READY;
1406 else
1407 next_state = SNK_WAIT_CAPABILITIES;
1408 tcpm_set_state(port, next_state, 0);
1409 break;
1410 case DR_SWAP_SEND:
1411 port->swap_status = (type == PD_CTRL_WAIT ?
1412 -EAGAIN : -EOPNOTSUPP);
1413 tcpm_set_state(port, DR_SWAP_CANCEL, 0);
1414 break;
1415 case PR_SWAP_SEND:
1416 port->swap_status = (type == PD_CTRL_WAIT ?
1417 -EAGAIN : -EOPNOTSUPP);
1418 tcpm_set_state(port, PR_SWAP_CANCEL, 0);
1419 break;
1420 case VCONN_SWAP_SEND:
1421 port->swap_status = (type == PD_CTRL_WAIT ?
1422 -EAGAIN : -EOPNOTSUPP);
1423 tcpm_set_state(port, VCONN_SWAP_CANCEL, 0);
1424 break;
1425 default:
1426 break;
1427 }
1428 break;
1429 case PD_CTRL_ACCEPT:
1430 switch (port->state) {
1431 case SNK_NEGOTIATE_CAPABILITIES:
1432 tcpm_set_state(port, SNK_TRANSITION_SINK, 0);
1433 break;
1434 case SOFT_RESET_SEND:
1435 port->message_id = 0;
5fec4b54 1436 port->rx_msgid = -1;
f0690a25
GR		 1437 if (port->pwr_role == TYPEC_SOURCE)
1438 next_state = SRC_SEND_CAPABILITIES;
1439 else
1440 next_state = SNK_WAIT_CAPABILITIES;
1441 tcpm_set_state(port, next_state, 0);
1442 break;
1443 case DR_SWAP_SEND:
1444 tcpm_set_state(port, DR_SWAP_CHANGE_DR, 0);
1445 break;
1446 case PR_SWAP_SEND:
1447 tcpm_set_state(port, PR_SWAP_START, 0);
1448 break;
1449 case VCONN_SWAP_SEND:
1450 tcpm_set_state(port, VCONN_SWAP_START, 0);
1451 break;
1452 default:
1453 break;
1454 }
1455 break;
1456 case PD_CTRL_SOFT_RESET:
1457 tcpm_set_state(port, SOFT_RESET, 0);
1458 break;
1459 case PD_CTRL_DR_SWAP:
1460 if (port->typec_caps.type != TYPEC_PORT_DRP) {
1461 tcpm_queue_message(port, PD_MSG_CTRL_REJECT);
1462 break;
1463 }
1464 /*
1465 * XXX
1466 * 6.3.9: If an alternate mode is active, a request to swap
1467 * alternate modes shall trigger a port reset.
1468 */
1469 switch (port->state) {
1470 case SRC_READY:
1471 case SNK_READY:
1472 tcpm_set_state(port, DR_SWAP_ACCEPT, 0);
1473 break;
1474 default:
1475 tcpm_queue_message(port, PD_MSG_CTRL_WAIT);
1476 break;
1477 }
1478 break;
1479 case PD_CTRL_PR_SWAP:
1480 if (port->typec_caps.type != TYPEC_PORT_DRP) {
1481 tcpm_queue_message(port, PD_MSG_CTRL_REJECT);
1482 break;
1483 }
1484 switch (port->state) {
1485 case SRC_READY:
1486 case SNK_READY:
1487 tcpm_set_state(port, PR_SWAP_ACCEPT, 0);
1488 break;
1489 default:
1490 tcpm_queue_message(port, PD_MSG_CTRL_WAIT);
1491 break;
1492 }
1493 break;
1494 case PD_CTRL_VCONN_SWAP:
1495 switch (port->state) {
1496 case SRC_READY:
1497 case SNK_READY:
1498 tcpm_set_state(port, VCONN_SWAP_ACCEPT, 0);
1499 break;
1500 default:
1501 tcpm_queue_message(port, PD_MSG_CTRL_WAIT);
1502 break;
1503 }
1504 break;
1505 default:
1506 tcpm_log(port, "Unhandled ctrl message type %#x", type);
1507 break;
1508 }
1509}
1510
1511static void tcpm_pd_rx_handler(struct work_struct *work)
1512{
1513 struct pd_rx_event *event = container_of(work,
1514 struct pd_rx_event, work);
1515 const struct pd_message *msg = &event->msg;
1516 unsigned int cnt = pd_header_cnt_le(msg->header);
1517 struct tcpm_port *port = event->port;
1518
1519 mutex_lock(&port->lock);
1520
1521 tcpm_log(port, "PD RX, header: %#x [%d]", le16_to_cpu(msg->header),
1522 port->attached);
1523
1524 if (port->attached) {
5fec4b54
GR		 1525 enum pd_ctrl_msg_type type = pd_header_type_le(msg->header);
1526 unsigned int msgid = pd_header_msgid_le(msg->header);
1527
1528 /*
1529 * USB PD standard, 6.6.1.2:
1530 * "... if MessageID value in a received Message is the
1531 * same as the stored value, the receiver shall return a
1532 * GoodCRC Message with that MessageID value and drop
1533 * the Message (this is a retry of an already received
1534 * Message). Note: this shall not apply to the Soft_Reset
1535 * Message which always has a MessageID value of zero."
1536 */
1537 if (msgid == port->rx_msgid && type != PD_CTRL_SOFT_RESET)
1538 goto done;
1539 port->rx_msgid = msgid;
1540
f0690a25
GR		 1541 /*
1542 * If both ends believe to be DFP/host, we have a data role
1543 * mismatch.
1544 */
1545 if (!!(le16_to_cpu(msg->header) & PD_HEADER_DATA_ROLE) ==
1546 (port->data_role == TYPEC_HOST)) {
1547 tcpm_log(port,
1548 "Data role mismatch, initiating error recovery");
1549 tcpm_set_state(port, ERROR_RECOVERY, 0);
1550 } else {
1551 if (cnt)
1552 tcpm_pd_data_request(port, msg);
1553 else
1554 tcpm_pd_ctrl_request(port, msg);
1555 }
1556 }
1557
5fec4b54 1558done:
f0690a25
GR		 1559 mutex_unlock(&port->lock);
1560 kfree(event);
1561}
1562
1563void tcpm_pd_receive(struct tcpm_port *port, const struct pd_message *msg)
1564{
1565 struct pd_rx_event *event;
1566
1567 event = kzalloc(sizeof(*event), GFP_ATOMIC);
1568 if (!event)
1569 return;
1570
1571 INIT_WORK(&event->work, tcpm_pd_rx_handler);
1572 event->port = port;
1573 memcpy(&event->msg, msg, sizeof(*msg));
1574 queue_work(port->wq, &event->work);
1575}
1576EXPORT_SYMBOL_GPL(tcpm_pd_receive);
1577
1578static int tcpm_pd_send_control(struct tcpm_port *port,
1579 enum pd_ctrl_msg_type type)
1580{
1581 struct pd_message msg;
1582
1583 memset(&msg, 0, sizeof(msg));
1584 msg.header = PD_HEADER_LE(type, port->pwr_role,
1585 port->data_role,
1586 port->message_id, 0);
1587
1588 return tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
1589}
1590
1591/*
1592 * Send queued message without affecting state.
1593 * Return true if state machine should go back to sleep,
1594 * false otherwise.
1595 */
1596static bool tcpm_send_queued_message(struct tcpm_port *port)
1597{
1598 enum pd_msg_request queued_message;
1599
1600 do {
1601 queued_message = port->queued_message;
1602 port->queued_message = PD_MSG_NONE;
1603
1604 switch (queued_message) {
1605 case PD_MSG_CTRL_WAIT:
1606 tcpm_pd_send_control(port, PD_CTRL_WAIT);
1607 break;
1608 case PD_MSG_CTRL_REJECT:
1609 tcpm_pd_send_control(port, PD_CTRL_REJECT);
1610 break;
1611 case PD_MSG_DATA_SINK_CAP:
1612 tcpm_pd_send_sink_caps(port);
1613 break;
1614 case PD_MSG_DATA_SOURCE_CAP:
1615 tcpm_pd_send_source_caps(port);
1616 break;
1617 default:
1618 break;
1619 }
1620 } while (port->queued_message != PD_MSG_NONE);
1621
1622 if (port->delayed_state != INVALID_STATE) {
1623 if (time_is_after_jiffies(port->delayed_runtime)) {
1624 mod_delayed_work(port->wq, &port->state_machine,
1625 port->delayed_runtime - jiffies);
1626 return true;
1627 }
1628 port->delayed_state = INVALID_STATE;
1629 }
1630 return false;
1631}
1632
1633static int tcpm_pd_check_request(struct tcpm_port *port)
1634{
1635 u32 pdo, rdo = port->sink_request;
1636 unsigned int max, op, pdo_max, index;
1637 enum pd_pdo_type type;
1638
1639 index = rdo_index(rdo);
1640 if (!index || index > port->nr_src_pdo)
1641 return -EINVAL;
1642
1643 pdo = port->src_pdo[index - 1];
1644 type = pdo_type(pdo);
1645 switch (type) {
1646 case PDO_TYPE_FIXED:
1647 case PDO_TYPE_VAR:
1648 max = rdo_max_current(rdo);
1649 op = rdo_op_current(rdo);
1650 pdo_max = pdo_max_current(pdo);
1651
1652 if (op > pdo_max)
1653 return -EINVAL;
1654 if (max > pdo_max && !(rdo & RDO_CAP_MISMATCH))
1655 return -EINVAL;
1656
1657 if (type == PDO_TYPE_FIXED)
1658 tcpm_log(port,
1659 "Requested %u mV, %u mA for %u / %u mA",
1660 pdo_fixed_voltage(pdo), pdo_max, op, max);
1661 else
1662 tcpm_log(port,
1663 "Requested %u -> %u mV, %u mA for %u / %u mA",
1664 pdo_min_voltage(pdo), pdo_max_voltage(pdo),
1665 pdo_max, op, max);
1666 break;
1667 case PDO_TYPE_BATT:
1668 max = rdo_max_power(rdo);
1669 op = rdo_op_power(rdo);
1670 pdo_max = pdo_max_power(pdo);
1671
1672 if (op > pdo_max)
1673 return -EINVAL;
1674 if (max > pdo_max && !(rdo & RDO_CAP_MISMATCH))
1675 return -EINVAL;
1676 tcpm_log(port,
1677 "Requested %u -> %u mV, %u mW for %u / %u mW",
1678 pdo_min_voltage(pdo), pdo_max_voltage(pdo),
1679 pdo_max, op, max);
1680 break;
1681 default:
1682 return -EINVAL;
1683 }
1684
1685 port->op_vsafe5v = index == 1;
1686
1687 return 0;
1688}
1689
1690static int tcpm_pd_select_pdo(struct tcpm_port *port)
1691{
1692 unsigned int i, max_mw = 0, max_mv = 0;
1693 int ret = -EINVAL;
1694
1695 /*
1696 * Select the source PDO providing the most power while staying within
1697 * the board's voltage limits. Prefer PDO providing exp
1698 */
1699 for (i = 0; i < port->nr_source_caps; i++) {
1700 u32 pdo = port->source_caps[i];
1701 enum pd_pdo_type type = pdo_type(pdo);
1702 unsigned int mv, ma, mw;
1703
1704 if (type == PDO_TYPE_FIXED)
1705 mv = pdo_fixed_voltage(pdo);
1706 else
1707 mv = pdo_min_voltage(pdo);
1708
1709 if (type == PDO_TYPE_BATT) {
1710 mw = pdo_max_power(pdo);
1711 } else {
1712 ma = min(pdo_max_current(pdo),
1713 port->max_snk_ma);
1714 mw = ma * mv / 1000;
1715 }
1716
1717 /* Perfer higher voltages if available */
1718 if ((mw > max_mw || (mw == max_mw && mv > max_mv)) &&
1719 mv <= port->max_snk_mv) {
1720 ret = i;
1721 max_mw = mw;
1722 max_mv = mv;
1723 }
1724 }
1725
1726 return ret;
1727}
1728
1729static int tcpm_pd_build_request(struct tcpm_port *port, u32 *rdo)
1730{
1731 unsigned int mv, ma, mw, flags;
1732 unsigned int max_ma, max_mw;
1733 enum pd_pdo_type type;
1734 int index;
1735 u32 pdo;
1736
1737 index = tcpm_pd_select_pdo(port);
1738 if (index < 0)
1739 return -EINVAL;
1740 pdo = port->source_caps[index];
1741 type = pdo_type(pdo);
1742
1743 if (type == PDO_TYPE_FIXED)
1744 mv = pdo_fixed_voltage(pdo);
1745 else
1746 mv = pdo_min_voltage(pdo);
1747
1748 /* Select maximum available current within the board's power limit */
1749 if (type == PDO_TYPE_BATT) {
1750 mw = pdo_max_power(pdo);
1751 ma = 1000 * min(mw, port->max_snk_mw) / mv;
1752 } else {
1753 ma = min(pdo_max_current(pdo),
1754 1000 * port->max_snk_mw / mv);
1755 }
1756 ma = min(ma, port->max_snk_ma);
1757
931693f9 1758 flags = RDO_USB_COMM | RDO_NO_SUSPEND;
f0690a25
GR		 1759
1760 /* Set mismatch bit if offered power is less than operating power */
1761 mw = ma * mv / 1000;
1762 max_ma = ma;
1763 max_mw = mw;
1764 if (mw < port->operating_snk_mw) {
1765 flags |= RDO_CAP_MISMATCH;
1766 max_mw = port->operating_snk_mw;
1767 max_ma = max_mw * 1000 / mv;
1768 }
1769
1770 tcpm_log(port, "cc=%d cc1=%d cc2=%d vbus=%d vconn=%s polarity=%d",
1771 port->cc_req, port->cc1, port->cc2, port->vbus_source,
1772 port->vconn_role == TYPEC_SOURCE ? "source" : "sink",
1773 port->polarity);
1774
1775 if (type == PDO_TYPE_BATT) {
1776 *rdo = RDO_BATT(index + 1, mw, max_mw, flags);
1777
1778 tcpm_log(port, "Requesting PDO %d: %u mV, %u mW%s",
1779 index, mv, mw,
1780 flags & RDO_CAP_MISMATCH ? " [mismatch]" : "");
1781 } else {
1782 *rdo = RDO_FIXED(index + 1, ma, max_ma, flags);
1783
1784 tcpm_log(port, "Requesting PDO %d: %u mV, %u mA%s",
1785 index, mv, ma,
1786 flags & RDO_CAP_MISMATCH ? " [mismatch]" : "");
1787 }
1788
1789 port->current_limit = ma;
1790 port->supply_voltage = mv;
1791
1792 return 0;
1793}
1794
1795static int tcpm_pd_send_request(struct tcpm_port *port)
1796{
1797 struct pd_message msg;
1798 int ret;
1799 u32 rdo;
1800
1801 ret = tcpm_pd_build_request(port, &rdo);
1802 if (ret < 0)
1803 return ret;
1804
1805 memset(&msg, 0, sizeof(msg));
1806 msg.header = PD_HEADER_LE(PD_DATA_REQUEST,
1807 port->pwr_role,
1808 port->data_role,
1809 port->message_id, 1);
1810 msg.payload[0] = cpu_to_le32(rdo);
1811
1812 return tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
1813}
1814
1815static int tcpm_set_vbus(struct tcpm_port *port, bool enable)
1816{
1817 int ret;
1818
1819 if (enable && port->vbus_charge)
1820 return -EINVAL;
1821
1822 tcpm_log(port, "vbus:=%d charge=%d", enable, port->vbus_charge);
1823
1824 ret = port->tcpc->set_vbus(port->tcpc, enable, port->vbus_charge);
1825 if (ret < 0)
1826 return ret;
1827
1828 port->vbus_source = enable;
1829 return 0;
1830}
1831
1832static int tcpm_set_charge(struct tcpm_port *port, bool charge)
1833{
1834 int ret;
1835
1836 if (charge && port->vbus_source)
1837 return -EINVAL;
1838
1839 if (charge != port->vbus_charge) {
1840 tcpm_log(port, "vbus=%d charge:=%d", port->vbus_source, charge);
1841 ret = port->tcpc->set_vbus(port->tcpc, port->vbus_source,
1842 charge);
1843 if (ret < 0)
1844 return ret;
1845 }
1846 port->vbus_charge = charge;
1847 return 0;
1848}
1849
1850static bool tcpm_start_drp_toggling(struct tcpm_port *port)
1851{
1852 int ret;
1853
1854 if (port->tcpc->start_drp_toggling &&
1855 port->typec_caps.type == TYPEC_PORT_DRP) {
1856 tcpm_log_force(port, "Start DRP toggling");
1857 ret = port->tcpc->start_drp_toggling(port->tcpc,
1858 tcpm_rp_cc(port));
1859 if (!ret)
1860 return true;
1861 }
1862
1863 return false;
1864}
1865
1866static void tcpm_set_cc(struct tcpm_port *port, enum typec_cc_status cc)
1867{
1868 tcpm_log(port, "cc:=%d", cc);
1869 port->cc_req = cc;
1870 port->tcpc->set_cc(port->tcpc, cc);
1871}
1872
1873static int tcpm_init_vbus(struct tcpm_port *port)
1874{
1875 int ret;
1876
1877 ret = port->tcpc->set_vbus(port->tcpc, false, false);
1878 port->vbus_source = false;
1879 port->vbus_charge = false;
1880 return ret;
1881}
1882
1883static int tcpm_init_vconn(struct tcpm_port *port)
1884{
1885 int ret;
1886
1887 ret = port->tcpc->set_vconn(port->tcpc, false);
1888 port->vconn_role = TYPEC_SINK;
1889 return ret;
1890}
1891
1892static void tcpm_typec_connect(struct tcpm_port *port)
1893{
1894 if (!port->connected) {
1895 /* Make sure we don't report stale identity information */
1896 memset(&port->partner_ident, 0, sizeof(port->partner_ident));
1897 port->partner_desc.usb_pd = port->pd_capable;
1898 if (tcpm_port_is_debug(port))
1899 port->partner_desc.accessory = TYPEC_ACCESSORY_DEBUG;
1900 else if (tcpm_port_is_audio(port))
1901 port->partner_desc.accessory = TYPEC_ACCESSORY_AUDIO;
1902 else
1903 port->partner_desc.accessory = TYPEC_ACCESSORY_NONE;
1904 port->partner = typec_register_partner(port->typec_port,
1905 &port->partner_desc);
1906 port->connected = true;
1907 }
1908}
1909
1910static int tcpm_src_attach(struct tcpm_port *port)
1911{
1912 enum typec_cc_polarity polarity =
1913 port->cc2 == TYPEC_CC_RD ? TYPEC_POLARITY_CC2
1914 : TYPEC_POLARITY_CC1;
1915 int ret;
1916
1917 if (port->attached)
1918 return 0;
1919
1920 ret = tcpm_set_polarity(port, polarity);
1921 if (ret < 0)
1922 return ret;
1923
1924 ret = tcpm_set_roles(port, true, TYPEC_SOURCE, TYPEC_HOST);
1925 if (ret < 0)
1926 return ret;
1927
1928 ret = port->tcpc->set_pd_rx(port->tcpc, true);
1929 if (ret < 0)
1930 goto out_disable_mux;
1931
1932 /*
1933 * USB Type-C specification, version 1.2,
1934 * chapter 4.5.2.2.8.1 (Attached.SRC Requirements)
1935 * Enable VCONN only if the non-RD port is set to RA.
1936 */
1937 if ((polarity == TYPEC_POLARITY_CC1 && port->cc2 == TYPEC_CC_RA) ||
1938 (polarity == TYPEC_POLARITY_CC2 && port->cc1 == TYPEC_CC_RA)) {
1939 ret = tcpm_set_vconn(port, true);
1940 if (ret < 0)
1941 goto out_disable_pd;
1942 }
1943
1944 ret = tcpm_set_vbus(port, true);
1945 if (ret < 0)
1946 goto out_disable_vconn;
1947
1948 port->pd_capable = false;
1949
1950 port->partner = NULL;
1951
1952 port->attached = true;
1953 port->send_discover = true;
1954
1955 return 0;
1956
1957out_disable_vconn:
1958 tcpm_set_vconn(port, false);
1959out_disable_pd:
1960 port->tcpc->set_pd_rx(port->tcpc, false);
1961out_disable_mux:
1962 tcpm_mux_set(port, TYPEC_MUX_NONE, TCPC_USB_SWITCH_DISCONNECT);
1963 return ret;
1964}
1965
1966static void tcpm_typec_disconnect(struct tcpm_port *port)
1967{
1968 if (port->connected) {
1969 typec_unregister_partner(port->partner);
1970 port->partner = NULL;
1971 port->connected = false;
1972 }
1973}
1974
1975static void tcpm_unregister_altmodes(struct tcpm_port *port)
1976{
1977 struct pd_mode_data *modep = &port->mode_data;
1978 int i;
1979
1980 for (i = 0; i < modep->altmodes; i++) {
1981 typec_unregister_altmode(port->partner_altmode[i]);
1982 port->partner_altmode[i] = NULL;
1983 }
1984
1985 memset(modep, 0, sizeof(*modep));
1986}
1987
1988static void tcpm_reset_port(struct tcpm_port *port)
1989{
1990 tcpm_unregister_altmodes(port);
1991 tcpm_typec_disconnect(port);
1992 port->attached = false;
1993 port->pd_capable = false;
1994
5fec4b54
GR		 1995 /*
1996 * First Rx ID should be 0; set this to a sentinel of -1 so that
1997 * we can check tcpm_pd_rx_handler() if we had seen it before.
1998 */
1999 port->rx_msgid = -1;
2000
f0690a25
GR		 2001 port->tcpc->set_pd_rx(port->tcpc, false);
2002 tcpm_init_vbus(port); /* also disables charging */
2003 tcpm_init_vconn(port);
2004 tcpm_set_current_limit(port, 0, 0);
2005 tcpm_set_polarity(port, TYPEC_POLARITY_CC1);
2006 tcpm_set_attached_state(port, false);
2007 port->try_src_count = 0;
2008 port->try_snk_count = 0;
2009}
2010
2011static void tcpm_detach(struct tcpm_port *port)
2012{
2013 if (!port->attached)
2014 return;
2015
2016 if (tcpm_port_is_disconnected(port))
2017 port->hard_reset_count = 0;
2018
2019 tcpm_reset_port(port);
2020}
2021
2022static void tcpm_src_detach(struct tcpm_port *port)
2023{
2024 tcpm_detach(port);
2025}
2026
2027static int tcpm_snk_attach(struct tcpm_port *port)
2028{
2029 int ret;
2030
2031 if (port->attached)
2032 return 0;
2033
2034 ret = tcpm_set_polarity(port, port->cc2 != TYPEC_CC_OPEN ?
2035 TYPEC_POLARITY_CC2 : TYPEC_POLARITY_CC1);
2036 if (ret < 0)
2037 return ret;
2038
2039 ret = tcpm_set_roles(port, true, TYPEC_SINK, TYPEC_DEVICE);
2040 if (ret < 0)
2041 return ret;
2042
2043 port->pd_capable = false;
2044
2045 port->partner = NULL;
2046
2047 port->attached = true;
2048 port->send_discover = true;
2049
2050 return 0;
2051}
2052
2053static void tcpm_snk_detach(struct tcpm_port *port)
2054{
2055 tcpm_detach(port);
2056
2057 /* XXX: (Dis)connect SuperSpeed mux? */
2058}
2059
2060static int tcpm_acc_attach(struct tcpm_port *port)
2061{
2062 int ret;
2063
2064 if (port->attached)
2065 return 0;
2066
2067 ret = tcpm_set_roles(port, true, TYPEC_SOURCE, TYPEC_HOST);
2068 if (ret < 0)
2069 return ret;
2070
2071 port->partner = NULL;
2072
2073 tcpm_typec_connect(port);
2074
2075 port->attached = true;
2076
2077 return 0;
2078}
2079
2080static void tcpm_acc_detach(struct tcpm_port *port)
2081{
2082 tcpm_detach(port);
2083}
2084
2085static inline enum tcpm_state hard_reset_state(struct tcpm_port *port)
2086{
2087 if (port->hard_reset_count < PD_N_HARD_RESET_COUNT)
2088 return HARD_RESET_SEND;
2089 if (port->pd_capable)
2090 return ERROR_RECOVERY;
2091 if (port->pwr_role == TYPEC_SOURCE)
2092 return SRC_UNATTACHED;
2093 if (port->state == SNK_WAIT_CAPABILITIES)
2094 return SNK_READY;
2095 return SNK_UNATTACHED;
2096}
2097
2098static inline enum tcpm_state ready_state(struct tcpm_port *port)
2099{
2100 if (port->pwr_role == TYPEC_SOURCE)
2101 return SRC_READY;
2102 else
2103 return SNK_READY;
2104}
2105
2106static inline enum tcpm_state unattached_state(struct tcpm_port *port)
2107{
2108 if (port->pwr_role == TYPEC_SOURCE)
2109 return SRC_UNATTACHED;
2110 else
2111 return SNK_UNATTACHED;
2112}
2113
2114static void tcpm_check_send_discover(struct tcpm_port *port)
2115{
2116 if (port->data_role == TYPEC_HOST && port->send_discover &&
2117 port->pd_capable) {
2118 tcpm_send_vdm(port, USB_SID_PD, CMD_DISCOVER_IDENT, NULL, 0);
2119 port->send_discover = false;
2120 }
2121}
2122
2123static void tcpm_swap_complete(struct tcpm_port *port, int result)
2124{
2125 if (port->swap_pending) {
2126 port->swap_status = result;
2127 port->swap_pending = false;
b17dd571 2128 port->non_pd_role_swap = false;
f0690a25
GR		 2129 complete(&port->swap_complete);
2130 }
2131}
2132
2133static void run_state_machine(struct tcpm_port *port)
2134{
2135 int ret;
2136
2137 port->enter_state = port->state;
2138 switch (port->state) {
2139 case DRP_TOGGLING:
2140 break;
2141 /* SRC states */
2142 case SRC_UNATTACHED:
b17dd571
GR		 2143 if (!port->non_pd_role_swap)
2144 tcpm_swap_complete(port, -ENOTCONN);
f0690a25
GR		 2145 tcpm_src_detach(port);
2146 if (tcpm_start_drp_toggling(port)) {
2147 tcpm_set_state(port, DRP_TOGGLING, 0);
2148 break;
2149 }
2150 tcpm_set_cc(port, tcpm_rp_cc(port));
2151 if (port->typec_caps.type == TYPEC_PORT_DRP)
2152 tcpm_set_state(port, SNK_UNATTACHED, PD_T_DRP_SNK);
2153 break;
2154 case SRC_ATTACH_WAIT:
2155 if (tcpm_port_is_debug(port))
2156 tcpm_set_state(port, DEBUG_ACC_ATTACHED,
2157 PD_T_CC_DEBOUNCE);
2158 else if (tcpm_port_is_audio(port))
2159 tcpm_set_state(port, AUDIO_ACC_ATTACHED,
2160 PD_T_CC_DEBOUNCE);
2161 else if (tcpm_port_is_source(port))
2162 tcpm_set_state(port,
2163 tcpm_try_snk(port) ? SNK_TRY
2164 : SRC_ATTACHED,
2165 PD_T_CC_DEBOUNCE);
2166 break;
2167
2168 case SNK_TRY:
2169 port->try_snk_count++;
2170 /*
2171 * Requirements:
2172 * - Do not drive vconn or vbus
2173 * - Terminate CC pins (both) to Rd
2174 * Action:
2175 * - Wait for tDRPTry (PD_T_DRP_TRY).
2176 * Until then, ignore any state changes.
2177 */
2178 tcpm_set_cc(port, TYPEC_CC_RD);
2179 tcpm_set_state(port, SNK_TRY_WAIT, PD_T_DRP_TRY);
2180 break;
2181 case SNK_TRY_WAIT:
2182 if (port->vbus_present && tcpm_port_is_sink(port)) {
2183 tcpm_set_state(port, SNK_ATTACHED, 0);
2184 break;
2185 }
2186 if (!tcpm_port_is_sink(port)) {
2187 tcpm_set_state(port, SRC_TRYWAIT,
2188 PD_T_PD_DEBOUNCE);
2189 break;
2190 }
2191 /* No vbus, cc state is sink or open */
2192 tcpm_set_state(port, SRC_TRYWAIT_UNATTACHED, PD_T_DRP_TRYWAIT);
2193 break;
2194 case SRC_TRYWAIT:
2195 tcpm_set_cc(port, tcpm_rp_cc(port));
2196 if (!port->vbus_present && tcpm_port_is_source(port))
2197 tcpm_set_state(port, SRC_ATTACHED, PD_T_CC_DEBOUNCE);
2198 else
2199 tcpm_set_state(port, SRC_TRYWAIT_UNATTACHED,
2200 PD_T_DRP_TRY);
2201 break;
2202 case SRC_TRYWAIT_UNATTACHED:
2203 tcpm_set_state(port, SNK_UNATTACHED, 0);
2204 break;
2205
2206 case SRC_ATTACHED:
2207 ret = tcpm_src_attach(port);
2208 tcpm_set_state(port, SRC_UNATTACHED,
2209 ret < 0 ? 0 : PD_T_PS_SOURCE_ON);
2210 break;
2211 case SRC_STARTUP:
2212 typec_set_pwr_opmode(port->typec_port, TYPEC_PWR_MODE_USB);
2213 port->pwr_opmode = TYPEC_PWR_MODE_USB;
2214 port->caps_count = 0;
2215 port->message_id = 0;
5fec4b54 2216 port->rx_msgid = -1;
f0690a25
GR		 2217 port->explicit_contract = false;
2218 tcpm_set_state(port, SRC_SEND_CAPABILITIES, 0);
2219 break;
2220 case SRC_SEND_CAPABILITIES:
2221 port->caps_count++;
2222 if (port->caps_count > PD_N_CAPS_COUNT) {
2223 tcpm_set_state(port, SRC_READY, 0);
2224 break;
2225 }
2226 ret = tcpm_pd_send_source_caps(port);
2227 if (ret < 0) {
2228 tcpm_set_state(port, SRC_SEND_CAPABILITIES,
2229 PD_T_SEND_SOURCE_CAP);
2230 } else {
2231 /*
2232 * Per standard, we should clear the reset counter here.
2233 * However, that can result in state machine hang-ups.
2234 * Reset it only in READY state to improve stability.
2235 */
2236 /* port->hard_reset_count = 0; */
2237 port->caps_count = 0;
2238 port->pd_capable = true;
2239 tcpm_set_state_cond(port, hard_reset_state(port),
2240 PD_T_SEND_SOURCE_CAP);
2241 }
2242 break;
2243 case SRC_NEGOTIATE_CAPABILITIES:
2244 ret = tcpm_pd_check_request(port);
2245 if (ret < 0) {
2246 tcpm_pd_send_control(port, PD_CTRL_REJECT);
2247 if (!port->explicit_contract) {
2248 tcpm_set_state(port,
2249 SRC_WAIT_NEW_CAPABILITIES, 0);
2250 } else {
2251 tcpm_set_state(port, SRC_READY, 0);
2252 }
2253 } else {
2254 tcpm_pd_send_control(port, PD_CTRL_ACCEPT);
2255 tcpm_set_state(port, SRC_TRANSITION_SUPPLY,
2256 PD_T_SRC_TRANSITION);
2257 }
2258 break;
2259 case SRC_TRANSITION_SUPPLY:
2260 /* XXX: regulator_set_voltage(vbus, ...) */
2261 tcpm_pd_send_control(port, PD_CTRL_PS_RDY);
2262 port->explicit_contract = true;
2263 typec_set_pwr_opmode(port->typec_port, TYPEC_PWR_MODE_PD);
2264 port->pwr_opmode = TYPEC_PWR_MODE_PD;
2265 tcpm_set_state_cond(port, SRC_READY, 0);
2266 break;
2267 case SRC_READY:
2268#if 1
2269 port->hard_reset_count = 0;
2270#endif
2271 port->try_src_count = 0;
2272
3113bf1a 2273 tcpm_swap_complete(port, 0);
f0690a25 2274 tcpm_typec_connect(port);
f0690a25
GR		 2275 tcpm_check_send_discover(port);
2276 /*
2277 * 6.3.5
2278 * Sending ping messages is not necessary if
2279 * - the source operates at vSafe5V
2280 * or
2281 * - The system is not operating in PD mode
2282 * or
2283 * - Both partners are connected using a Type-C connector
2284 * XXX How do we know that ?
2285 */
2286 if (port->pwr_opmode == TYPEC_PWR_MODE_PD &&
2287 !port->op_vsafe5v) {
2288 tcpm_pd_send_control(port, PD_CTRL_PING);
2289 tcpm_set_state_cond(port, SRC_READY,
2290 PD_T_SOURCE_ACTIVITY);
2291 }
2292 break;
2293 case SRC_WAIT_NEW_CAPABILITIES:
2294 /* Nothing to do... */
2295 break;
2296
2297 /* SNK states */
2298 case SNK_UNATTACHED:
b17dd571
GR		 2299 if (!port->non_pd_role_swap)
2300 tcpm_swap_complete(port, -ENOTCONN);
f0690a25
GR		 2301 tcpm_snk_detach(port);
2302 if (tcpm_start_drp_toggling(port)) {
2303 tcpm_set_state(port, DRP_TOGGLING, 0);
2304 break;
2305 }
2306 tcpm_set_cc(port, TYPEC_CC_RD);
2307 if (port->typec_caps.type == TYPEC_PORT_DRP)
2308 tcpm_set_state(port, SRC_UNATTACHED, PD_T_DRP_SRC);
2309 break;
2310 case SNK_ATTACH_WAIT:
2311 if ((port->cc1 == TYPEC_CC_OPEN &&
2312 port->cc2 != TYPEC_CC_OPEN) ||
2313 (port->cc1 != TYPEC_CC_OPEN &&
2314 port->cc2 == TYPEC_CC_OPEN))
2315 tcpm_set_state(port, SNK_DEBOUNCED,
2316 PD_T_CC_DEBOUNCE);
2317 else if (tcpm_port_is_disconnected(port))
2318 tcpm_set_state(port, SNK_UNATTACHED,
2319 PD_T_PD_DEBOUNCE);
2320 break;
2321 case SNK_DEBOUNCED:
2322 if (tcpm_port_is_disconnected(port))
2323 tcpm_set_state(port, SNK_UNATTACHED,
2324 PD_T_PD_DEBOUNCE);
2325 else if (port->vbus_present)
2326 tcpm_set_state(port,
2327 tcpm_try_src(port) ? SRC_TRY
2328 : SNK_ATTACHED,
2329 0);
2330 else
2331 /* Wait for VBUS, but not forever */
2332 tcpm_set_state(port, SNK_UNATTACHED, PD_T_PS_SOURCE_ON);
2333 break;
2334
2335 case SRC_TRY:
2336 port->try_src_count++;
2337 tcpm_set_cc(port, tcpm_rp_cc(port));
2338 tcpm_set_state(port, SNK_TRYWAIT, PD_T_DRP_TRY);
2339 break;
2340 case SRC_TRY_DEBOUNCE:
2341 tcpm_set_state(port, SRC_ATTACHED, PD_T_PD_DEBOUNCE);
2342 break;
2343 case SNK_TRYWAIT:
2344 tcpm_set_cc(port, TYPEC_CC_RD);
2345 tcpm_set_state(port, SNK_TRYWAIT_DEBOUNCE, PD_T_CC_DEBOUNCE);
2346 break;
2347 case SNK_TRYWAIT_DEBOUNCE:
2348 if (port->vbus_present) {
2349 tcpm_set_state(port, SNK_ATTACHED, 0);
2350 break;
2351 }
2352 if (tcpm_port_is_disconnected(port)) {
2353 tcpm_set_state(port, SNK_UNATTACHED,
2354 PD_T_PD_DEBOUNCE);
2355 break;
2356 }
2357 if (tcpm_port_is_source(port))
2358 tcpm_set_state(port, SRC_ATTACHED, 0);
2359 /* XXX Are we supposed to stay in this state ? */
2360 break;
2361 case SNK_TRYWAIT_VBUS:
2362 tcpm_set_state(port, SNK_ATTACHED, PD_T_CC_DEBOUNCE);
2363 break;
2364
2365 case SNK_ATTACHED:
2366 ret = tcpm_snk_attach(port);
2367 if (ret < 0)
2368 tcpm_set_state(port, SNK_UNATTACHED, 0);
2369 else
2370 tcpm_set_state(port, SNK_STARTUP, 0);
2371 break;
2372 case SNK_STARTUP:
2373 /* XXX: callback into infrastructure */
2374 typec_set_pwr_opmode(port->typec_port, TYPEC_PWR_MODE_USB);
2375 port->pwr_opmode = TYPEC_PWR_MODE_USB;
2376 port->message_id = 0;
5fec4b54 2377 port->rx_msgid = -1;
f0690a25
GR		 2378 port->explicit_contract = false;
2379 tcpm_set_state(port, SNK_DISCOVERY, 0);
2380 break;
2381 case SNK_DISCOVERY:
2382 if (port->vbus_present) {
2383 tcpm_set_current_limit(port,
2384 tcpm_get_current_limit(port),
2385 5000);
2386 tcpm_set_charge(port, true);
2387 tcpm_set_state(port, SNK_WAIT_CAPABILITIES, 0);
2388 break;
2389 }
2390 /*
2391 * For DRP, timeouts differ. Also, handling is supposed to be
2392 * different and much more complex (dead battery detection;
2393 * see USB power delivery specification, section 8.3.3.6.1.5.1).
2394 */
2395 tcpm_set_state(port, hard_reset_state(port),
2396 port->typec_caps.type == TYPEC_PORT_DRP ?
2397 PD_T_DB_DETECT : PD_T_NO_RESPONSE);
2398 break;
2399 case SNK_DISCOVERY_DEBOUNCE:
2400 tcpm_set_state(port, SNK_DISCOVERY_DEBOUNCE_DONE,
2401 PD_T_CC_DEBOUNCE);
2402 break;
2403 case SNK_DISCOVERY_DEBOUNCE_DONE:
2404 if (!tcpm_port_is_disconnected(port) &&
2405 tcpm_port_is_sink(port) &&
2406 time_is_after_jiffies(port->delayed_runtime)) {
2407 tcpm_set_state(port, SNK_DISCOVERY,
2408 port->delayed_runtime - jiffies);
2409 break;
2410 }
2411 tcpm_set_state(port, unattached_state(port), 0);
2412 break;
2413 case SNK_WAIT_CAPABILITIES:
2414 ret = port->tcpc->set_pd_rx(port->tcpc, true);
2415 if (ret < 0) {
2416 tcpm_set_state(port, SNK_READY, 0);
2417 break;
2418 }
2419 /*
2420 * If VBUS has never been low, and we time out waiting
2421 * for source cap, try a soft reset first, in case we
2422 * were already in a stable contract before this boot.
2423 * Do this only once.
2424 */
2425 if (port->vbus_never_low) {
2426 port->vbus_never_low = false;
2427 tcpm_set_state(port, SOFT_RESET_SEND,
2428 PD_T_SINK_WAIT_CAP);
2429 } else {
2430 tcpm_set_state(port, hard_reset_state(port),
2431 PD_T_SINK_WAIT_CAP);
2432 }
2433 break;
2434 case SNK_NEGOTIATE_CAPABILITIES:
2435 port->pd_capable = true;
2436 port->hard_reset_count = 0;
2437 ret = tcpm_pd_send_request(port);
2438 if (ret < 0) {
2439 /* Let the Source send capabilities again. */
2440 tcpm_set_state(port, SNK_WAIT_CAPABILITIES, 0);
2441 } else {
2442 tcpm_set_state_cond(port, hard_reset_state(port),
2443 PD_T_SENDER_RESPONSE);
2444 }
2445 break;
2446 case SNK_TRANSITION_SINK:
2447 case SNK_TRANSITION_SINK_VBUS:
2448 tcpm_set_state(port, hard_reset_state(port),
2449 PD_T_PS_TRANSITION);
2450 break;
2451 case SNK_READY:
2452 port->try_snk_count = 0;
2453 port->explicit_contract = true;
2454 typec_set_pwr_opmode(port->typec_port, TYPEC_PWR_MODE_PD);
2455 port->pwr_opmode = TYPEC_PWR_MODE_PD;
2456
3113bf1a 2457 tcpm_swap_complete(port, 0);
f0690a25 2458 tcpm_typec_connect(port);
f0690a25
GR		 2459 tcpm_check_send_discover(port);
2460 break;
2461
2462 /* Accessory states */
2463 case ACC_UNATTACHED:
2464 tcpm_acc_detach(port);
2465 tcpm_set_state(port, SRC_UNATTACHED, 0);
2466 break;
2467 case DEBUG_ACC_ATTACHED:
2468 case AUDIO_ACC_ATTACHED:
2469 ret = tcpm_acc_attach(port);
2470 if (ret < 0)
2471 tcpm_set_state(port, ACC_UNATTACHED, 0);
2472 break;
2473 case AUDIO_ACC_DEBOUNCE:
2474 tcpm_set_state(port, ACC_UNATTACHED, PD_T_CC_DEBOUNCE);
2475 break;
2476
2477 /* Hard_Reset states */
2478 case HARD_RESET_SEND:
2479 tcpm_pd_transmit(port, TCPC_TX_HARD_RESET, NULL);
2480 tcpm_set_state(port, HARD_RESET_START, 0);
2481 break;
2482 case HARD_RESET_START:
2483 port->hard_reset_count++;
2484 port->tcpc->set_pd_rx(port->tcpc, false);
2485 tcpm_unregister_altmodes(port);
2486 port->send_discover = true;
2487 if (port->pwr_role == TYPEC_SOURCE)
2488 tcpm_set_state(port, SRC_HARD_RESET_VBUS_OFF,
2489 PD_T_PS_HARD_RESET);
2490 else
2491 tcpm_set_state(port, SNK_HARD_RESET_SINK_OFF, 0);
2492 break;
2493 case SRC_HARD_RESET_VBUS_OFF:
2494 tcpm_set_vconn(port, true);
2495 tcpm_set_vbus(port, false);
2496 tcpm_set_roles(port, false, TYPEC_SOURCE, TYPEC_HOST);
2497 tcpm_set_state(port, SRC_HARD_RESET_VBUS_ON, PD_T_SRC_RECOVER);
2498 break;
2499 case SRC_HARD_RESET_VBUS_ON:
2500 tcpm_set_vbus(port, true);
2501 port->tcpc->set_pd_rx(port->tcpc, true);
2502 tcpm_set_attached_state(port, true);
2503 tcpm_set_state(port, SRC_UNATTACHED, PD_T_PS_SOURCE_ON);
2504 break;
2505 case SNK_HARD_RESET_SINK_OFF:
2506 tcpm_set_vconn(port, false);
2507 tcpm_set_charge(port, false);
2508 tcpm_set_roles(port, false, TYPEC_SINK, TYPEC_DEVICE);
2509 /*
2510 * VBUS may or may not toggle, depending on the adapter.
2511 * If it doesn't toggle, transition to SNK_HARD_RESET_SINK_ON
2512 * directly after timeout.
2513 */
2514 tcpm_set_state(port, SNK_HARD_RESET_SINK_ON, PD_T_SAFE_0V);
2515 break;
2516 case SNK_HARD_RESET_WAIT_VBUS:
2517 /* Assume we're disconnected if VBUS doesn't come back. */
2518 tcpm_set_state(port, SNK_UNATTACHED,
2519 PD_T_SRC_RECOVER_MAX + PD_T_SRC_TURN_ON);
2520 break;
2521 case SNK_HARD_RESET_SINK_ON:
2522 /* Note: There is no guarantee that VBUS is on in this state */
2523 /*
2524 * XXX:
2525 * The specification suggests that dual mode ports in sink
2526 * mode should transition to state PE_SRC_Transition_to_default.
2527 * See USB power delivery specification chapter 8.3.3.6.1.3.
2528 * This would mean to to
2529 * - turn off VCONN, reset power supply
2530 * - request hardware reset
2531 * - turn on VCONN
2532 * - Transition to state PE_Src_Startup
2533 * SNK only ports shall transition to state Snk_Startup
2534 * (see chapter 8.3.3.3.8).
2535 * Similar, dual-mode ports in source mode should transition
2536 * to PE_SNK_Transition_to_default.
2537 */
2538 tcpm_set_attached_state(port, true);
2539 tcpm_set_state(port, SNK_STARTUP, 0);
2540 break;
2541
2542 /* Soft_Reset states */
2543 case SOFT_RESET:
2544 port->message_id = 0;
5fec4b54 2545 port->rx_msgid = -1;
f0690a25
GR		 2546 tcpm_pd_send_control(port, PD_CTRL_ACCEPT);
2547 if (port->pwr_role == TYPEC_SOURCE)
2548 tcpm_set_state(port, SRC_SEND_CAPABILITIES, 0);
2549 else
2550 tcpm_set_state(port, SNK_WAIT_CAPABILITIES, 0);
2551 break;
2552 case SOFT_RESET_SEND:
2553 port->message_id = 0;
5fec4b54 2554 port->rx_msgid = -1;
f0690a25
GR		 2555 if (tcpm_pd_send_control(port, PD_CTRL_SOFT_RESET))
2556 tcpm_set_state_cond(port, hard_reset_state(port), 0);
2557 else
2558 tcpm_set_state_cond(port, hard_reset_state(port),
2559 PD_T_SENDER_RESPONSE);
2560 break;
2561
2562 /* DR_Swap states */
2563 case DR_SWAP_SEND:
2564 tcpm_pd_send_control(port, PD_CTRL_DR_SWAP);
2565 tcpm_set_state_cond(port, DR_SWAP_SEND_TIMEOUT,
2566 PD_T_SENDER_RESPONSE);
2567 break;
2568 case DR_SWAP_ACCEPT:
2569 tcpm_pd_send_control(port, PD_CTRL_ACCEPT);
2570 tcpm_set_state_cond(port, DR_SWAP_CHANGE_DR, 0);
2571 break;
2572 case DR_SWAP_SEND_TIMEOUT:
2573 tcpm_swap_complete(port, -ETIMEDOUT);
2574 tcpm_set_state(port, ready_state(port), 0);
2575 break;
2576 case DR_SWAP_CHANGE_DR:
2577 if (port->data_role == TYPEC_HOST) {
2578 tcpm_unregister_altmodes(port);
2579 tcpm_set_roles(port, true, port->pwr_role,
2580 TYPEC_DEVICE);
2581 } else {
2582 tcpm_set_roles(port, true, port->pwr_role,
2583 TYPEC_HOST);
2584 port->send_discover = true;
2585 }
f0690a25
GR		 2586 tcpm_set_state(port, ready_state(port), 0);
2587 break;
2588
2589 /* PR_Swap states */
2590 case PR_SWAP_ACCEPT:
2591 tcpm_pd_send_control(port, PD_CTRL_ACCEPT);
2592 tcpm_set_state(port, PR_SWAP_START, 0);
2593 break;
2594 case PR_SWAP_SEND:
2595 tcpm_pd_send_control(port, PD_CTRL_PR_SWAP);
2596 tcpm_set_state_cond(port, PR_SWAP_SEND_TIMEOUT,
2597 PD_T_SENDER_RESPONSE);
2598 break;
2599 case PR_SWAP_SEND_TIMEOUT:
2600 tcpm_swap_complete(port, -ETIMEDOUT);
2601 tcpm_set_state(port, ready_state(port), 0);
2602 break;
2603 case PR_SWAP_START:
2604 if (port->pwr_role == TYPEC_SOURCE)
2605 tcpm_set_state(port, PR_SWAP_SRC_SNK_TRANSITION_OFF,
2606 PD_T_SRC_TRANSITION);
2607 else
2608 tcpm_set_state(port, PR_SWAP_SNK_SRC_SINK_OFF, 0);
2609 break;
2610 case PR_SWAP_SRC_SNK_TRANSITION_OFF:
2611 tcpm_set_vbus(port, false);
2612 port->explicit_contract = false;
2613 tcpm_set_state(port, PR_SWAP_SRC_SNK_SOURCE_OFF,
2614 PD_T_PS_SOURCE_OFF);
2615 break;
2616 case PR_SWAP_SRC_SNK_SOURCE_OFF:
2617 tcpm_set_cc(port, TYPEC_CC_RD);
050161ea
GR		 2618 /*
2619 * USB-PD standard, 6.2.1.4, Port Power Role:
2620 * "During the Power Role Swap Sequence, for the initial Source
2621 * Port, the Port Power Role field shall be set to Sink in the
2622 * PS_RDY Message indicating that the initial Source’s power
2623 * supply is turned off"
2624 */
2625 tcpm_set_pwr_role(port, TYPEC_SINK);
f0690a25
GR		 2626 if (tcpm_pd_send_control(port, PD_CTRL_PS_RDY)) {
2627 tcpm_set_state(port, ERROR_RECOVERY, 0);
2628 break;
2629 }
2630 tcpm_set_state_cond(port, SNK_UNATTACHED, PD_T_PS_SOURCE_ON);
2631 break;
2632 case PR_SWAP_SRC_SNK_SINK_ON:
f0690a25
GR		 2633 tcpm_set_state(port, SNK_STARTUP, 0);
2634 break;
2635 case PR_SWAP_SNK_SRC_SINK_OFF:
2636 tcpm_set_charge(port, false);
2637 tcpm_set_state(port, hard_reset_state(port),
2638 PD_T_PS_SOURCE_OFF);
2639 break;
2640 case PR_SWAP_SNK_SRC_SOURCE_ON:
2641 tcpm_set_cc(port, tcpm_rp_cc(port));
2642 tcpm_set_vbus(port, true);
050161ea
GR		 2643 /*
2644 * USB PD standard, 6.2.1.4:
2645 * "Subsequent Messages initiated by the Policy Engine,
2646 * such as the PS_RDY Message sent to indicate that Vbus
2647 * is ready, will have the Port Power Role field set to
2648 * Source."
2649 */
f0690a25 2650 tcpm_set_pwr_role(port, TYPEC_SOURCE);
050161ea 2651 tcpm_pd_send_control(port, PD_CTRL_PS_RDY);
f0690a25
GR		 2652 tcpm_set_state(port, SRC_STARTUP, 0);
2653 break;
2654
2655 case VCONN_SWAP_ACCEPT:
2656 tcpm_pd_send_control(port, PD_CTRL_ACCEPT);
2657 tcpm_set_state(port, VCONN_SWAP_START, 0);
2658 break;
2659 case VCONN_SWAP_SEND:
2660 tcpm_pd_send_control(port, PD_CTRL_VCONN_SWAP);
2661 tcpm_set_state(port, VCONN_SWAP_SEND_TIMEOUT,
2662 PD_T_SENDER_RESPONSE);
2663 break;
2664 case VCONN_SWAP_SEND_TIMEOUT:
2665 tcpm_swap_complete(port, -ETIMEDOUT);
2666 tcpm_set_state(port, ready_state(port), 0);
2667 break;
2668 case VCONN_SWAP_START:
2669 if (port->vconn_role == TYPEC_SOURCE)
2670 tcpm_set_state(port, VCONN_SWAP_WAIT_FOR_VCONN, 0);
2671 else
2672 tcpm_set_state(port, VCONN_SWAP_TURN_ON_VCONN, 0);
2673 break;
2674 case VCONN_SWAP_WAIT_FOR_VCONN:
2675 tcpm_set_state(port, hard_reset_state(port),
2676 PD_T_VCONN_SOURCE_ON);
2677 break;
2678 case VCONN_SWAP_TURN_ON_VCONN:
2679 tcpm_set_vconn(port, true);
2680 tcpm_pd_send_control(port, PD_CTRL_PS_RDY);
f0690a25
GR		 2681 tcpm_set_state(port, ready_state(port), 0);
2682 break;
2683 case VCONN_SWAP_TURN_OFF_VCONN:
2684 tcpm_set_vconn(port, false);
f0690a25
GR		 2685 tcpm_set_state(port, ready_state(port), 0);
2686 break;
2687
2688 case DR_SWAP_CANCEL:
2689 case PR_SWAP_CANCEL:
2690 case VCONN_SWAP_CANCEL:
2691 tcpm_swap_complete(port, port->swap_status);
2692 if (port->pwr_role == TYPEC_SOURCE)
2693 tcpm_set_state(port, SRC_READY, 0);
2694 else
2695 tcpm_set_state(port, SNK_READY, 0);
2696 break;
2697
2698 case BIST_RX:
2699 switch (BDO_MODE_MASK(port->bist_request)) {
2700 case BDO_MODE_CARRIER2:
2701 tcpm_pd_transmit(port, TCPC_TX_BIST_MODE_2, NULL);
2702 break;
2703 default:
2704 break;
2705 }
2706 /* Always switch to unattached state */
2707 tcpm_set_state(port, unattached_state(port), 0);
2708 break;
2709 case ERROR_RECOVERY:
2710 tcpm_swap_complete(port, -EPROTO);
b17dd571
GR		 2711 tcpm_set_state(port, PORT_RESET, 0);
2712 break;
2713 case PORT_RESET:
f0690a25 2714 tcpm_reset_port(port);
f0690a25 2715 tcpm_set_cc(port, TYPEC_CC_OPEN);
b17dd571 2716 tcpm_set_state(port, PORT_RESET_WAIT_OFF,
f0690a25
GR		 2717 PD_T_ERROR_RECOVERY);
2718 break;
b17dd571 2719 case PORT_RESET_WAIT_OFF:
f0690a25
GR		 2720 tcpm_set_state(port,
2721 tcpm_default_state(port),
2722 port->vbus_present ? PD_T_PS_SOURCE_OFF : 0);
2723 break;
2724 default:
2725 WARN(1, "Unexpected port state %d\n", port->state);
2726 break;
2727 }
2728}
2729
2730static void tcpm_state_machine_work(struct work_struct *work)
2731{
2732 struct tcpm_port *port = container_of(work, struct tcpm_port,
2733 state_machine.work);
2734 enum tcpm_state prev_state;
2735
2736 mutex_lock(&port->lock);
2737 port->state_machine_running = true;
2738
2739 if (port->queued_message && tcpm_send_queued_message(port))
2740 goto done;
2741
2742 /* If we were queued due to a delayed state change, update it now */
2743 if (port->delayed_state) {
2744 tcpm_log(port, "state change %s -> %s [delayed %ld ms]",
2745 tcpm_states[port->state],
2746 tcpm_states[port->delayed_state], port->delay_ms);
2747 port->prev_state = port->state;
2748 port->state = port->delayed_state;
2749 port->delayed_state = INVALID_STATE;
2750 }
2751
2752 /*
2753 * Continue running as long as we have (non-delayed) state changes
2754 * to make.
2755 */
2756 do {
2757 prev_state = port->state;
2758 run_state_machine(port);
2759 if (port->queued_message)
2760 tcpm_send_queued_message(port);
2761 } while (port->state != prev_state && !port->delayed_state);
2762
2763done:
2764 port->state_machine_running = false;
2765 mutex_unlock(&port->lock);
2766}
2767
2768static void _tcpm_cc_change(struct tcpm_port *port, enum typec_cc_status cc1,
2769 enum typec_cc_status cc2)
2770{
2771 enum typec_cc_status old_cc1, old_cc2;
2772 enum tcpm_state new_state;
2773
2774 old_cc1 = port->cc1;
2775 old_cc2 = port->cc2;
2776 port->cc1 = cc1;
2777 port->cc2 = cc2;
2778
2779 tcpm_log_force(port,
2780 "CC1: %u -> %u, CC2: %u -> %u [state %s, polarity %d, %s]",
2781 old_cc1, cc1, old_cc2, cc2, tcpm_states[port->state],
2782 port->polarity,
2783 tcpm_port_is_disconnected(port) ? "disconnected"
2784 : "connected");
2785
2786 switch (port->state) {
2787 case DRP_TOGGLING:
2788 if (tcpm_port_is_debug(port) || tcpm_port_is_audio(port) ||
2789 tcpm_port_is_source(port))
2790 tcpm_set_state(port, SRC_ATTACH_WAIT, 0);
2791 else if (tcpm_port_is_sink(port))
2792 tcpm_set_state(port, SNK_ATTACH_WAIT, 0);
2793 break;
2794 case SRC_UNATTACHED:
2795 case ACC_UNATTACHED:
2796 if (tcpm_port_is_debug(port) || tcpm_port_is_audio(port) ||
2797 tcpm_port_is_source(port))
2798 tcpm_set_state(port, SRC_ATTACH_WAIT, 0);
2799 break;
2800 case SRC_ATTACH_WAIT:
2801 if (tcpm_port_is_disconnected(port) ||
2802 tcpm_port_is_audio_detached(port))
2803 tcpm_set_state(port, SRC_UNATTACHED, 0);
2804 else if (cc1 != old_cc1 || cc2 != old_cc2)
2805 tcpm_set_state(port, SRC_ATTACH_WAIT, 0);
2806 break;
2807 case SRC_ATTACHED:
2808 if (tcpm_port_is_disconnected(port))
2809 tcpm_set_state(port, SRC_UNATTACHED, 0);
2810 break;
2811
2812 case SNK_UNATTACHED:
2813 if (tcpm_port_is_sink(port))
2814 tcpm_set_state(port, SNK_ATTACH_WAIT, 0);
2815 break;
2816 case SNK_ATTACH_WAIT:
2817 if ((port->cc1 == TYPEC_CC_OPEN &&
2818 port->cc2 != TYPEC_CC_OPEN) ||
2819 (port->cc1 != TYPEC_CC_OPEN &&
2820 port->cc2 == TYPEC_CC_OPEN))
2821 new_state = SNK_DEBOUNCED;
2822 else if (tcpm_port_is_disconnected(port))
2823 new_state = SNK_UNATTACHED;
2824 else
2825 break;
2826 if (new_state != port->delayed_state)
2827 tcpm_set_state(port, SNK_ATTACH_WAIT, 0);
2828 break;
2829 case SNK_DEBOUNCED:
2830 if (tcpm_port_is_disconnected(port))
2831 new_state = SNK_UNATTACHED;
2832 else if (port->vbus_present)
2833 new_state = tcpm_try_src(port) ? SRC_TRY : SNK_ATTACHED;
2834 else
2835 new_state = SNK_UNATTACHED;
2836 if (new_state != port->delayed_state)
2837 tcpm_set_state(port, SNK_DEBOUNCED, 0);
2838 break;
2839 case SNK_READY:
2840 if (tcpm_port_is_disconnected(port))
2841 tcpm_set_state(port, unattached_state(port), 0);
2842 else if (!port->pd_capable &&
2843 (cc1 != old_cc1 || cc2 != old_cc2))
2844 tcpm_set_current_limit(port,
2845 tcpm_get_current_limit(port),
2846 5000);
2847 break;
2848
2849 case AUDIO_ACC_ATTACHED:
2850 if (cc1 == TYPEC_CC_OPEN || cc2 == TYPEC_CC_OPEN)
2851 tcpm_set_state(port, AUDIO_ACC_DEBOUNCE, 0);
2852 break;
2853 case AUDIO_ACC_DEBOUNCE:
2854 if (tcpm_port_is_audio(port))
2855 tcpm_set_state(port, AUDIO_ACC_ATTACHED, 0);
2856 break;
2857
2858 case DEBUG_ACC_ATTACHED:
2859 if (cc1 == TYPEC_CC_OPEN || cc2 == TYPEC_CC_OPEN)
2860 tcpm_set_state(port, ACC_UNATTACHED, 0);
2861 break;
2862
2863 case SNK_TRY:
2864 /* Do nothing, waiting for timeout */
2865 break;
2866
2867 case SNK_DISCOVERY:
2868 /* CC line is unstable, wait for debounce */
2869 if (tcpm_port_is_disconnected(port))
2870 tcpm_set_state(port, SNK_DISCOVERY_DEBOUNCE, 0);
2871 break;
2872 case SNK_DISCOVERY_DEBOUNCE:
2873 break;
2874
2875 case SRC_TRYWAIT:
2876 /* Hand over to state machine if needed */
2877 if (!port->vbus_present && tcpm_port_is_source(port))
2878 new_state = SRC_ATTACHED;
2879 else
2880 new_state = SRC_TRYWAIT_UNATTACHED;
2881
2882 if (new_state != port->delayed_state)
2883 tcpm_set_state(port, SRC_TRYWAIT, 0);
2884 break;
2885 case SNK_TRY_WAIT:
2886 if (port->vbus_present && tcpm_port_is_sink(port)) {
2887 tcpm_set_state(port, SNK_ATTACHED, 0);
2888 break;
2889 }
2890 if (!tcpm_port_is_sink(port))
2891 new_state = SRC_TRYWAIT;
2892 else
2893 new_state = SRC_TRYWAIT_UNATTACHED;
2894
2895 if (new_state != port->delayed_state)
2896 tcpm_set_state(port, SNK_TRY_WAIT, 0);
2897 break;
2898
2899 case SRC_TRY:
2900 tcpm_set_state(port, SRC_TRY_DEBOUNCE, 0);
2901 break;
2902 case SRC_TRY_DEBOUNCE:
2903 tcpm_set_state(port, SRC_TRY, 0);
2904 break;
2905 case SNK_TRYWAIT_DEBOUNCE:
2906 if (port->vbus_present) {
2907 tcpm_set_state(port, SNK_ATTACHED, 0);
2908 break;
2909 }
2910 if (tcpm_port_is_source(port)) {
2911 tcpm_set_state(port, SRC_ATTACHED, 0);
2912 break;
2913 }
2914 if (tcpm_port_is_disconnected(port) &&
2915 port->delayed_state != SNK_UNATTACHED)
2916 tcpm_set_state(port, SNK_TRYWAIT_DEBOUNCE, 0);
2917 break;
2918
2919 case PR_SWAP_SNK_SRC_SINK_OFF:
2920 case PR_SWAP_SRC_SNK_TRANSITION_OFF:
2921 case PR_SWAP_SRC_SNK_SOURCE_OFF:
2922 /*
2923 * CC state change is expected here; we just turned off power.
2924 * Ignore it.
2925 */
2926 break;
2927
2928 default:
2929 if (tcpm_port_is_disconnected(port))
2930 tcpm_set_state(port, unattached_state(port), 0);
2931 break;
2932 }
2933}
2934
2935static void _tcpm_pd_vbus_on(struct tcpm_port *port)
2936{
2937 enum tcpm_state new_state;
2938
2939 tcpm_log_force(port, "VBUS on");
2940 port->vbus_present = true;
2941 switch (port->state) {
2942 case SNK_TRANSITION_SINK_VBUS:
2943 tcpm_set_state(port, SNK_READY, 0);
2944 break;
2945 case SNK_DISCOVERY:
2946 tcpm_set_state(port, SNK_DISCOVERY, 0);
2947 break;
2948
2949 case SNK_DEBOUNCED:
2950 tcpm_set_state(port, tcpm_try_src(port) ? SRC_TRY
2951 : SNK_ATTACHED,
2952 0);
2953 break;
2954 case SNK_HARD_RESET_WAIT_VBUS:
2955 tcpm_set_state(port, SNK_HARD_RESET_SINK_ON, 0);
2956 break;
2957 case SRC_ATTACHED:
2958 tcpm_set_state(port, SRC_STARTUP, 0);
2959 break;
2960 case SRC_HARD_RESET_VBUS_ON:
2961 tcpm_set_state(port, SRC_STARTUP, 0);
2962 break;
2963
2964 case SNK_TRY:
2965 /* Do nothing, waiting for timeout */
2966 break;
2967 case SRC_TRYWAIT:
2968 /* Hand over to state machine if needed */
2969 if (port->delayed_state != SRC_TRYWAIT_UNATTACHED)
2970 tcpm_set_state(port, SRC_TRYWAIT, 0);
2971 break;
2972 case SNK_TRY_WAIT:
2973 if (tcpm_port_is_sink(port)) {
2974 tcpm_set_state(port, SNK_ATTACHED, 0);
2975 break;
2976 }
2977 if (!tcpm_port_is_sink(port))
2978 new_state = SRC_TRYWAIT;
2979 else
2980 new_state = SRC_TRYWAIT_UNATTACHED;
2981
2982 if (new_state != port->delayed_state)
2983 tcpm_set_state(port, SNK_TRY_WAIT, 0);
2984 break;
2985 case SNK_TRYWAIT:
2986 tcpm_set_state(port, SNK_TRYWAIT_VBUS, 0);
2987 break;
2988
2989 default:
2990 break;
2991 }
2992}
2993
2994static void _tcpm_pd_vbus_off(struct tcpm_port *port)
2995{
2996 enum tcpm_state new_state;
2997
2998 tcpm_log_force(port, "VBUS off");
2999 port->vbus_present = false;
3000 port->vbus_never_low = false;
3001 switch (port->state) {
3002 case SNK_HARD_RESET_SINK_OFF:
3003 tcpm_set_state(port, SNK_HARD_RESET_WAIT_VBUS, 0);
3004 break;
3005 case SRC_HARD_RESET_VBUS_OFF:
3006 tcpm_set_state(port, SRC_HARD_RESET_VBUS_ON, 0);
3007 break;
3008 case HARD_RESET_SEND:
3009 break;
3010
3011 case SNK_TRY:
3012 /* Do nothing, waiting for timeout */
3013 break;
3014 case SRC_TRYWAIT:
3015 /* Hand over to state machine if needed */
3016 if (tcpm_port_is_source(port))
3017 new_state = SRC_ATTACHED;
3018 else
3019 new_state = SRC_TRYWAIT_UNATTACHED;
3020 if (new_state != port->delayed_state)
3021 tcpm_set_state(port, SRC_TRYWAIT, 0);
3022 break;
3023 case SNK_TRY_WAIT:
3024 if (!tcpm_port_is_sink(port))
3025 new_state = SRC_TRYWAIT;
3026 else
3027 new_state = SRC_TRYWAIT_UNATTACHED;
3028
3029 if (new_state != port->delayed_state)
3030 tcpm_set_state(port, SNK_TRY_WAIT, 0);
3031 break;
3032 case SNK_TRYWAIT_VBUS:
3033 tcpm_set_state(port, SNK_TRYWAIT, 0);
3034 break;
3035
3036 case SNK_ATTACH_WAIT:
3037 tcpm_set_state(port, SNK_UNATTACHED, 0);
3038 break;
3039
3040 case SNK_NEGOTIATE_CAPABILITIES:
3041 break;
3042
3043 case PR_SWAP_SRC_SNK_TRANSITION_OFF:
3044 tcpm_set_state(port, PR_SWAP_SRC_SNK_SOURCE_OFF, 0);
3045 break;
3046
3047 case PR_SWAP_SNK_SRC_SINK_OFF:
3048 /* Do nothing, expected */
3049 break;
3050
b17dd571 3051 case PORT_RESET_WAIT_OFF:
c749d4d0 3052 tcpm_set_state(port, tcpm_default_state(port), 0);
f0690a25
GR		 3053 break;
3054
3055 default:
3056 if (port->pwr_role == TYPEC_SINK &&
3057 port->attached)
3058 tcpm_set_state(port, SNK_UNATTACHED, 0);
3059 break;
3060 }
3061}
3062
3063static void _tcpm_pd_hard_reset(struct tcpm_port *port)
3064{
3065 tcpm_log_force(port, "Received hard reset");
3066 /*
3067 * If we keep receiving hard reset requests, executing the hard reset
3068 * must have failed. Revert to error recovery if that happens.
3069 */
3070 tcpm_set_state(port,
3071 port->hard_reset_count < PD_N_HARD_RESET_COUNT ?
3072 HARD_RESET_START : ERROR_RECOVERY,
3073 0);
3074}
3075
3076static void tcpm_pd_event_handler(struct work_struct *work)
3077{
3078 struct tcpm_port *port = container_of(work, struct tcpm_port,
3079 event_work);
3080 u32 events;
3081
3082 mutex_lock(&port->lock);
3083
3084 spin_lock(&port->pd_event_lock);
3085 while (port->pd_events) {
3086 events = port->pd_events;
3087 port->pd_events = 0;
3088 spin_unlock(&port->pd_event_lock);
3089 if (events & TCPM_RESET_EVENT)
3090 _tcpm_pd_hard_reset(port);
3091 if (events & TCPM_VBUS_EVENT) {
3092 bool vbus;
3093
3094 vbus = port->tcpc->get_vbus(port->tcpc);
3095 if (vbus)
3096 _tcpm_pd_vbus_on(port);
3097 else
3098 _tcpm_pd_vbus_off(port);
3099 }
3100 if (events & TCPM_CC_EVENT) {
3101 enum typec_cc_status cc1, cc2;
3102
3103 if (port->tcpc->get_cc(port->tcpc, &cc1, &cc2) == 0)
3104 _tcpm_cc_change(port, cc1, cc2);
3105 }
3106 spin_lock(&port->pd_event_lock);
3107 }
3108 spin_unlock(&port->pd_event_lock);
3109 mutex_unlock(&port->lock);
3110}
3111
3112void tcpm_cc_change(struct tcpm_port *port)
3113{
3114 spin_lock(&port->pd_event_lock);
3115 port->pd_events |= TCPM_CC_EVENT;
3116 spin_unlock(&port->pd_event_lock);
3117 queue_work(port->wq, &port->event_work);
3118}
3119EXPORT_SYMBOL_GPL(tcpm_cc_change);
3120
3121void tcpm_vbus_change(struct tcpm_port *port)
3122{
3123 spin_lock(&port->pd_event_lock);
3124 port->pd_events |= TCPM_VBUS_EVENT;
3125 spin_unlock(&port->pd_event_lock);
3126 queue_work(port->wq, &port->event_work);
3127}
3128EXPORT_SYMBOL_GPL(tcpm_vbus_change);
3129
3130void tcpm_pd_hard_reset(struct tcpm_port *port)
3131{
3132 spin_lock(&port->pd_event_lock);
3133 port->pd_events = TCPM_RESET_EVENT;
3134 spin_unlock(&port->pd_event_lock);
3135 queue_work(port->wq, &port->event_work);
3136}
3137EXPORT_SYMBOL_GPL(tcpm_pd_hard_reset);
3138
3139static int tcpm_dr_set(const struct typec_capability *cap,
3140 enum typec_data_role data)
3141{
3142 struct tcpm_port *port = typec_cap_to_tcpm(cap);
3143 int ret;
3144
3145 mutex_lock(&port->swap_lock);
3146 mutex_lock(&port->lock);
3147
b17dd571 3148 if (port->typec_caps.type != TYPEC_PORT_DRP) {
f0690a25
GR		 3149 ret = -EINVAL;
3150 goto port_unlock;
3151 }
3152 if (port->state != SRC_READY && port->state != SNK_READY) {
3153 ret = -EAGAIN;
3154 goto port_unlock;
3155 }
3156
3157 if (port->data_role == data) {
3158 ret = 0;
3159 goto port_unlock;
3160 }
3161
3162 /*
3163 * XXX
3164 * 6.3.9: If an alternate mode is active, a request to swap
3165 * alternate modes shall trigger a port reset.
3166 * Reject data role swap request in this case.
3167 */
3168
b17dd571
GR		 3169 if (!port->pd_capable) {
3170 /*
3171 * If the partner is not PD capable, reset the port to
3172 * trigger a role change. This can only work if a preferred
3173 * role is configured, and if it matches the requested role.
3174 */
3175 if (port->try_role == TYPEC_NO_PREFERRED_ROLE ||
3176 port->try_role == port->pwr_role) {
3177 ret = -EINVAL;
3178 goto port_unlock;
3179 }
3180 port->non_pd_role_swap = true;
3181 tcpm_set_state(port, PORT_RESET, 0);
3182 } else {
3183 tcpm_set_state(port, DR_SWAP_SEND, 0);
3184 }
3185
f0690a25
GR		 3186 port->swap_status = 0;
3187 port->swap_pending = true;
3188 reinit_completion(&port->swap_complete);
f0690a25
GR		 3189 mutex_unlock(&port->lock);
3190
9adf9f9e
GR		 3191 if (!wait_for_completion_timeout(&port->swap_complete,
3192 msecs_to_jiffies(PD_ROLE_SWAP_TIMEOUT)))
3193 ret = -ETIMEDOUT;
3194 else
3195 ret = port->swap_status;
f0690a25 3196
b17dd571 3197 port->non_pd_role_swap = false;
f0690a25
GR		 3198 goto swap_unlock;
3199
3200port_unlock:
3201 mutex_unlock(&port->lock);
3202swap_unlock:
3203 mutex_unlock(&port->swap_lock);
3204 return ret;
3205}
3206
3207static int tcpm_pr_set(const struct typec_capability *cap,
3208 enum typec_role role)
3209{
3210 struct tcpm_port *port = typec_cap_to_tcpm(cap);
3211 int ret;
3212
3213 mutex_lock(&port->swap_lock);
3214 mutex_lock(&port->lock);
3215
3216 if (port->typec_caps.type != TYPEC_PORT_DRP) {
3217 ret = -EINVAL;
3218 goto port_unlock;
3219 }
3220 if (port->state != SRC_READY && port->state != SNK_READY) {
3221 ret = -EAGAIN;
3222 goto port_unlock;
3223 }
3224
3225 if (role == port->pwr_role) {
3226 ret = 0;
3227 goto port_unlock;
3228 }
3229
f0690a25
GR		 3230 port->swap_status = 0;
3231 port->swap_pending = true;
3232 reinit_completion(&port->swap_complete);
3233 tcpm_set_state(port, PR_SWAP_SEND, 0);
3234 mutex_unlock(&port->lock);
3235
9adf9f9e
GR		 3236 if (!wait_for_completion_timeout(&port->swap_complete,
3237 msecs_to_jiffies(PD_ROLE_SWAP_TIMEOUT)))
3238 ret = -ETIMEDOUT;
3239 else
3240 ret = port->swap_status;
f0690a25 3241
f0690a25
GR		 3242 goto swap_unlock;
3243
3244port_unlock:
3245 mutex_unlock(&port->lock);
3246swap_unlock:
3247 mutex_unlock(&port->swap_lock);
3248 return ret;
3249}
3250
3251static int tcpm_vconn_set(const struct typec_capability *cap,
3252 enum typec_role role)
3253{
3254 struct tcpm_port *port = typec_cap_to_tcpm(cap);
3255 int ret;
3256
3257 mutex_lock(&port->swap_lock);
3258 mutex_lock(&port->lock);
3259
3260 if (port->state != SRC_READY && port->state != SNK_READY) {
3261 ret = -EAGAIN;
3262 goto port_unlock;
3263 }
3264
3265 if (role == port->vconn_role) {
3266 ret = 0;
3267 goto port_unlock;
3268 }
3269
3270 port->swap_status = 0;
3271 port->swap_pending = true;
3272 reinit_completion(&port->swap_complete);
3273 tcpm_set_state(port, VCONN_SWAP_SEND, 0);
3274 mutex_unlock(&port->lock);
3275
9adf9f9e
GR		 3276 if (!wait_for_completion_timeout(&port->swap_complete,
3277 msecs_to_jiffies(PD_ROLE_SWAP_TIMEOUT)))
3278 ret = -ETIMEDOUT;
3279 else
3280 ret = port->swap_status;
f0690a25 3281
f0690a25
GR		 3282 goto swap_unlock;
3283
3284port_unlock:
3285 mutex_unlock(&port->lock);
3286swap_unlock:
3287 mutex_unlock(&port->swap_lock);
3288 return ret;
3289}
3290
3291static int tcpm_try_role(const struct typec_capability *cap, int role)
3292{
3293 struct tcpm_port *port = typec_cap_to_tcpm(cap);
3294 struct tcpc_dev *tcpc = port->tcpc;
3295 int ret = 0;
3296
3297 mutex_lock(&port->lock);
3298 if (tcpc->try_role)
3299 ret = tcpc->try_role(tcpc, role);
3300 if (!ret && !tcpc->config->try_role_hw)
3301 port->try_role = role;
3302 port->try_src_count = 0;
3303 port->try_snk_count = 0;
3304 mutex_unlock(&port->lock);
3305
3306 return ret;
3307}
3308
3309static void tcpm_init(struct tcpm_port *port)
3310{
3311 enum typec_cc_status cc1, cc2;
3312
3313 port->tcpc->init(port->tcpc);
3314
3315 tcpm_reset_port(port);
3316
3317 /*
3318 * XXX
3319 * Should possibly wait for VBUS to settle if it was enabled locally
3320 * since tcpm_reset_port() will disable VBUS.
3321 */
3322 port->vbus_present = port->tcpc->get_vbus(port->tcpc);
3323 if (port->vbus_present)
3324 port->vbus_never_low = true;
3325
3326 tcpm_set_state(port, tcpm_default_state(port), 0);
3327
3328 if (port->tcpc->get_cc(port->tcpc, &cc1, &cc2) == 0)
3329 _tcpm_cc_change(port, cc1, cc2);
3330
3331 /*
3332 * Some adapters need a clean slate at startup, and won't recover
3333 * otherwise. So do not try to be fancy and force a clean disconnect.
3334 */
b17dd571 3335 tcpm_set_state(port, PORT_RESET, 0);
f0690a25
GR		 3336}
3337
3338void tcpm_tcpc_reset(struct tcpm_port *port)
3339{
3340 mutex_lock(&port->lock);
3341 /* XXX: Maintain PD connection if possible? */
3342 tcpm_init(port);
3343 mutex_unlock(&port->lock);
3344}
3345EXPORT_SYMBOL_GPL(tcpm_tcpc_reset);
3346
3347static int tcpm_copy_pdos(u32 *dest_pdo, const u32 *src_pdo,
3348 unsigned int nr_pdo)
3349{
3350 unsigned int i;
3351
3352 if (nr_pdo > PDO_MAX_OBJECTS)
3353 nr_pdo = PDO_MAX_OBJECTS;
3354
3355 for (i = 0; i < nr_pdo; i++)
3356 dest_pdo[i] = src_pdo[i];
3357
3358 return nr_pdo;
3359}
3360
193a6801
GR		 3361static int tcpm_copy_vdos(u32 *dest_vdo, const u32 *src_vdo,
3362 unsigned int nr_vdo)
3363{
3364 unsigned int i;
3365
3366 if (nr_vdo > VDO_MAX_OBJECTS)
3367 nr_vdo = VDO_MAX_OBJECTS;
3368
3369 for (i = 0; i < nr_vdo; i++)
3370 dest_vdo[i] = src_vdo[i];
3371
3372 return nr_vdo;
3373}
3374
f0690a25
GR		 3375void tcpm_update_source_capabilities(struct tcpm_port *port, const u32 *pdo,
3376 unsigned int nr_pdo)
3377{
3378 mutex_lock(&port->lock);
3379 port->nr_src_pdo = tcpm_copy_pdos(port->src_pdo, pdo, nr_pdo);
3380 switch (port->state) {
3381 case SRC_UNATTACHED:
3382 case SRC_ATTACH_WAIT:
3383 case SRC_TRYWAIT:
3384 tcpm_set_cc(port, tcpm_rp_cc(port));
3385 break;
3386 case SRC_SEND_CAPABILITIES:
3387 case SRC_NEGOTIATE_CAPABILITIES:
3388 case SRC_READY:
3389 case SRC_WAIT_NEW_CAPABILITIES:
3390 tcpm_set_cc(port, tcpm_rp_cc(port));
3391 tcpm_set_state(port, SRC_SEND_CAPABILITIES, 0);
3392 break;
3393 default:
3394 break;
3395 }
3396 mutex_unlock(&port->lock);
3397}
3398EXPORT_SYMBOL_GPL(tcpm_update_source_capabilities);
3399
3400void tcpm_update_sink_capabilities(struct tcpm_port *port, const u32 *pdo,
3401 unsigned int nr_pdo,
3402 unsigned int max_snk_mv,
3403 unsigned int max_snk_ma,
3404 unsigned int max_snk_mw,
3405 unsigned int operating_snk_mw)
3406{
3407 mutex_lock(&port->lock);
3408 port->nr_snk_pdo = tcpm_copy_pdos(port->snk_pdo, pdo, nr_pdo);
3409 port->max_snk_mv = max_snk_mv;
3410 port->max_snk_ma = max_snk_ma;
3411 port->max_snk_mw = max_snk_mw;
3412 port->operating_snk_mw = operating_snk_mw;
3413
3414 switch (port->state) {
3415 case SNK_NEGOTIATE_CAPABILITIES:
3416 case SNK_READY:
3417 case SNK_TRANSITION_SINK:
3418 case SNK_TRANSITION_SINK_VBUS:
3419 tcpm_set_state(port, SNK_NEGOTIATE_CAPABILITIES, 0);
3420 break;
3421 default:
3422 break;
3423 }
3424 mutex_unlock(&port->lock);
3425}
3426EXPORT_SYMBOL_GPL(tcpm_update_sink_capabilities);
3427
3428struct tcpm_port *tcpm_register_port(struct device *dev, struct tcpc_dev *tcpc)
3429{
3430 struct tcpm_port *port;
3431 int i, err;
3432
3433 if (!dev || !tcpc || !tcpc->config ||
3434 !tcpc->get_vbus || !tcpc->set_cc || !tcpc->get_cc ||
3435 !tcpc->set_polarity || !tcpc->set_vconn || !tcpc->set_vbus ||
3436 !tcpc->set_pd_rx || !tcpc->set_roles || !tcpc->pd_transmit)
3437 return ERR_PTR(-EINVAL);
3438
3439 port = devm_kzalloc(dev, sizeof(*port), GFP_KERNEL);
3440 if (!port)
3441 return ERR_PTR(-ENOMEM);
3442
3443 port->dev = dev;
3444 port->tcpc = tcpc;
3445
3446 mutex_init(&port->lock);
3447 mutex_init(&port->swap_lock);
3448
3449 port->wq = create_singlethread_workqueue(dev_name(dev));
3450 if (!port->wq)
3451 return ERR_PTR(-ENOMEM);
3452 INIT_DELAYED_WORK(&port->state_machine, tcpm_state_machine_work);
3453 INIT_DELAYED_WORK(&port->vdm_state_machine, vdm_state_machine_work);
3454 INIT_WORK(&port->event_work, tcpm_pd_event_handler);
3455
3456 spin_lock_init(&port->pd_event_lock);
3457
3458 init_completion(&port->tx_complete);
3459 init_completion(&port->swap_complete);
3460
3461 port->nr_src_pdo = tcpm_copy_pdos(port->src_pdo, tcpc->config->src_pdo,
3462 tcpc->config->nr_src_pdo);
3463 port->nr_snk_pdo = tcpm_copy_pdos(port->snk_pdo, tcpc->config->snk_pdo,
3464 tcpc->config->nr_snk_pdo);
193a6801
GR		 3465 port->nr_snk_vdo = tcpm_copy_vdos(port->snk_vdo, tcpc->config->snk_vdo,
3466 tcpc->config->nr_snk_vdo);
f0690a25
GR		 3467
3468 port->max_snk_mv = tcpc->config->max_snk_mv;
3469 port->max_snk_ma = tcpc->config->max_snk_ma;
3470 port->max_snk_mw = tcpc->config->max_snk_mw;
3471 port->operating_snk_mw = tcpc->config->operating_snk_mw;
3472 if (!tcpc->config->try_role_hw)
3473 port->try_role = tcpc->config->default_role;
3474 else
3475 port->try_role = TYPEC_NO_PREFERRED_ROLE;
3476
3477 port->typec_caps.prefer_role = tcpc->config->default_role;
3478 port->typec_caps.type = tcpc->config->type;
3479 port->typec_caps.revision = 0x0120; /* Type-C spec release 1.2 */
3480 port->typec_caps.pd_revision = 0x0200; /* USB-PD spec release 2.0 */
3481 port->typec_caps.dr_set = tcpm_dr_set;
3482 port->typec_caps.pr_set = tcpm_pr_set;
3483 port->typec_caps.vconn_set = tcpm_vconn_set;
3484 port->typec_caps.try_role = tcpm_try_role;
3485
3486 port->partner_desc.identity = &port->partner_ident;
3487
3488 /*
3489 * TODO:
3490 * - alt_modes, set_alt_mode
3491 * - {debug,audio}_accessory
3492 */
3493
3494 port->typec_port = typec_register_port(port->dev, &port->typec_caps);
3495 if (!port->typec_port) {
3496 err = -ENOMEM;
3497 goto out_destroy_wq;
3498 }
3499
3500 if (tcpc->config->alt_modes) {
3c41dbde 3501 const struct typec_altmode_desc *paltmode = tcpc->config->alt_modes;
f0690a25
GR		 3502
3503 i = 0;
3504 while (paltmode->svid && i < ARRAY_SIZE(port->port_altmode)) {
3505 port->port_altmode[i] =
3506 typec_port_register_altmode(port->typec_port,
3507 paltmode);
3508 if (!port->port_altmode[i]) {
3509 tcpm_log(port,
3510 "%s: failed to register port alternate mode 0x%x",
3511 dev_name(dev), paltmode->svid);
3512 break;
3513 }
3514 i++;
3515 paltmode++;
3516 }
3517 }
3518
3519 tcpm_debugfs_init(port);
3520 mutex_lock(&port->lock);
3521 tcpm_init(port);
3522 mutex_unlock(&port->lock);
3523
3524 tcpm_log(port, "%s: registered", dev_name(dev));
3525 return port;
3526
3527out_destroy_wq:
3528 destroy_workqueue(port->wq);
3529 return ERR_PTR(err);
3530}
3531EXPORT_SYMBOL_GPL(tcpm_register_port);
3532
3533void tcpm_unregister_port(struct tcpm_port *port)
3534{
3535 int i;
3536
3537 for (i = 0; i < ARRAY_SIZE(port->port_altmode); i++)
3538 typec_unregister_altmode(port->port_altmode[i]);
3539 typec_unregister_port(port->typec_port);
3540 tcpm_debugfs_exit(port);
3541 destroy_workqueue(port->wq);
3542}
3543EXPORT_SYMBOL_GPL(tcpm_unregister_port);
3544
3545MODULE_AUTHOR("Guenter Roeck <groeck@chromium.org>");
3546MODULE_DESCRIPTION("USB Type-C Port Manager");
3547MODULE_LICENSE("GPL");
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