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[thirdparty/linux.git] / drivers / usb / typec / tcpm / tcpm.c
1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Copyright 2015-2017 Google, Inc
4 *
5 * USB Power Delivery protocol stack.
6 */
7
8 #include <linux/completion.h>
9 #include <linux/debugfs.h>
10 #include <linux/device.h>
11 #include <linux/jiffies.h>
12 #include <linux/kernel.h>
13 #include <linux/module.h>
14 #include <linux/mutex.h>
15 #include <linux/power_supply.h>
16 #include <linux/proc_fs.h>
17 #include <linux/property.h>
18 #include <linux/sched/clock.h>
19 #include <linux/seq_file.h>
20 #include <linux/slab.h>
21 #include <linux/spinlock.h>
22 #include <linux/usb.h>
23 #include <linux/usb/pd.h>
24 #include <linux/usb/pd_ado.h>
25 #include <linux/usb/pd_bdo.h>
26 #include <linux/usb/pd_ext_sdb.h>
27 #include <linux/usb/pd_vdo.h>
28 #include <linux/usb/role.h>
29 #include <linux/usb/tcpm.h>
30 #include <linux/usb/typec_altmode.h>
31 #include <linux/workqueue.h>
32
33 #define FOREACH_STATE(S) \
34 S(INVALID_STATE), \
35 S(TOGGLING), \
36 S(SRC_UNATTACHED), \
37 S(SRC_ATTACH_WAIT), \
38 S(SRC_ATTACHED), \
39 S(SRC_STARTUP), \
40 S(SRC_SEND_CAPABILITIES), \
41 S(SRC_SEND_CAPABILITIES_TIMEOUT), \
42 S(SRC_NEGOTIATE_CAPABILITIES), \
43 S(SRC_TRANSITION_SUPPLY), \
44 S(SRC_READY), \
45 S(SRC_WAIT_NEW_CAPABILITIES), \
46 \
47 S(SNK_UNATTACHED), \
48 S(SNK_ATTACH_WAIT), \
49 S(SNK_DEBOUNCED), \
50 S(SNK_ATTACHED), \
51 S(SNK_STARTUP), \
52 S(SNK_DISCOVERY), \
53 S(SNK_DISCOVERY_DEBOUNCE), \
54 S(SNK_DISCOVERY_DEBOUNCE_DONE), \
55 S(SNK_WAIT_CAPABILITIES), \
56 S(SNK_NEGOTIATE_CAPABILITIES), \
57 S(SNK_NEGOTIATE_PPS_CAPABILITIES), \
58 S(SNK_TRANSITION_SINK), \
59 S(SNK_TRANSITION_SINK_VBUS), \
60 S(SNK_READY), \
61 \
62 S(ACC_UNATTACHED), \
63 S(DEBUG_ACC_ATTACHED), \
64 S(AUDIO_ACC_ATTACHED), \
65 S(AUDIO_ACC_DEBOUNCE), \
66 \
67 S(HARD_RESET_SEND), \
68 S(HARD_RESET_START), \
69 S(SRC_HARD_RESET_VBUS_OFF), \
70 S(SRC_HARD_RESET_VBUS_ON), \
71 S(SNK_HARD_RESET_SINK_OFF), \
72 S(SNK_HARD_RESET_WAIT_VBUS), \
73 S(SNK_HARD_RESET_SINK_ON), \
74 \
75 S(SOFT_RESET), \
76 S(SOFT_RESET_SEND), \
77 \
78 S(DR_SWAP_ACCEPT), \
79 S(DR_SWAP_SEND), \
80 S(DR_SWAP_SEND_TIMEOUT), \
81 S(DR_SWAP_CANCEL), \
82 S(DR_SWAP_CHANGE_DR), \
83 \
84 S(PR_SWAP_ACCEPT), \
85 S(PR_SWAP_SEND), \
86 S(PR_SWAP_SEND_TIMEOUT), \
87 S(PR_SWAP_CANCEL), \
88 S(PR_SWAP_START), \
89 S(PR_SWAP_SRC_SNK_TRANSITION_OFF), \
90 S(PR_SWAP_SRC_SNK_SOURCE_OFF), \
91 S(PR_SWAP_SRC_SNK_SOURCE_OFF_CC_DEBOUNCED), \
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 S(PR_SWAP_SNK_SRC_SOURCE_ON_VBUS_RAMPED_UP), \
96 \
97 S(VCONN_SWAP_ACCEPT), \
98 S(VCONN_SWAP_SEND), \
99 S(VCONN_SWAP_SEND_TIMEOUT), \
100 S(VCONN_SWAP_CANCEL), \
101 S(VCONN_SWAP_START), \
102 S(VCONN_SWAP_WAIT_FOR_VCONN), \
103 S(VCONN_SWAP_TURN_ON_VCONN), \
104 S(VCONN_SWAP_TURN_OFF_VCONN), \
105 \
106 S(SNK_TRY), \
107 S(SNK_TRY_WAIT), \
108 S(SNK_TRY_WAIT_DEBOUNCE), \
109 S(SNK_TRY_WAIT_DEBOUNCE_CHECK_VBUS), \
110 S(SRC_TRYWAIT), \
111 S(SRC_TRYWAIT_DEBOUNCE), \
112 S(SRC_TRYWAIT_UNATTACHED), \
113 \
114 S(SRC_TRY), \
115 S(SRC_TRY_WAIT), \
116 S(SRC_TRY_DEBOUNCE), \
117 S(SNK_TRYWAIT), \
118 S(SNK_TRYWAIT_DEBOUNCE), \
119 S(SNK_TRYWAIT_VBUS), \
120 S(BIST_RX), \
121 \
122 S(GET_STATUS_SEND), \
123 S(GET_STATUS_SEND_TIMEOUT), \
124 S(GET_PPS_STATUS_SEND), \
125 S(GET_PPS_STATUS_SEND_TIMEOUT), \
126 \
127 S(ERROR_RECOVERY), \
128 S(PORT_RESET), \
129 S(PORT_RESET_WAIT_OFF)
130
131 #define GENERATE_ENUM(e) e
132 #define GENERATE_STRING(s) #s
133
134 enum tcpm_state {
135 FOREACH_STATE(GENERATE_ENUM)
136 };
137
138 static const char * const tcpm_states[] = {
139 FOREACH_STATE(GENERATE_STRING)
140 };
141
142 enum vdm_states {
143 VDM_STATE_ERR_BUSY = -3,
144 VDM_STATE_ERR_SEND = -2,
145 VDM_STATE_ERR_TMOUT = -1,
146 VDM_STATE_DONE = 0,
147 /* Anything >0 represents an active state */
148 VDM_STATE_READY = 1,
149 VDM_STATE_BUSY = 2,
150 VDM_STATE_WAIT_RSP_BUSY = 3,
151 };
152
153 enum pd_msg_request {
154 PD_MSG_NONE = 0,
155 PD_MSG_CTRL_REJECT,
156 PD_MSG_CTRL_WAIT,
157 PD_MSG_CTRL_NOT_SUPP,
158 PD_MSG_DATA_SINK_CAP,
159 PD_MSG_DATA_SOURCE_CAP,
160 };
161
162 /* Events from low level driver */
163
164 #define TCPM_CC_EVENT BIT(0)
165 #define TCPM_VBUS_EVENT BIT(1)
166 #define TCPM_RESET_EVENT BIT(2)
167
168 #define LOG_BUFFER_ENTRIES 1024
169 #define LOG_BUFFER_ENTRY_SIZE 128
170
171 /* Alternate mode support */
172
173 #define SVID_DISCOVERY_MAX 16
174 #define ALTMODE_DISCOVERY_MAX (SVID_DISCOVERY_MAX * MODE_DISCOVERY_MAX)
175
176 struct pd_mode_data {
177 int svid_index; /* current SVID index */
178 int nsvids;
179 u16 svids[SVID_DISCOVERY_MAX];
180 int altmodes; /* number of alternate modes */
181 struct typec_altmode_desc altmode_desc[ALTMODE_DISCOVERY_MAX];
182 };
183
184 struct pd_pps_data {
185 u32 min_volt;
186 u32 max_volt;
187 u32 max_curr;
188 u32 out_volt;
189 u32 op_curr;
190 bool supported;
191 bool active;
192 };
193
194 struct tcpm_port {
195 struct device *dev;
196
197 struct mutex lock; /* tcpm state machine lock */
198 struct workqueue_struct *wq;
199
200 struct typec_capability typec_caps;
201 struct typec_port *typec_port;
202
203 struct tcpc_dev *tcpc;
204 struct usb_role_switch *role_sw;
205
206 enum typec_role vconn_role;
207 enum typec_role pwr_role;
208 enum typec_data_role data_role;
209 enum typec_pwr_opmode pwr_opmode;
210
211 struct usb_pd_identity partner_ident;
212 struct typec_partner_desc partner_desc;
213 struct typec_partner *partner;
214
215 enum typec_cc_status cc_req;
216
217 enum typec_cc_status cc1;
218 enum typec_cc_status cc2;
219 enum typec_cc_polarity polarity;
220
221 bool attached;
222 bool connected;
223 enum typec_port_type port_type;
224 bool vbus_present;
225 bool vbus_never_low;
226 bool vbus_source;
227 bool vbus_charge;
228
229 bool send_discover;
230 bool op_vsafe5v;
231
232 int try_role;
233 int try_snk_count;
234 int try_src_count;
235
236 enum pd_msg_request queued_message;
237
238 enum tcpm_state enter_state;
239 enum tcpm_state prev_state;
240 enum tcpm_state state;
241 enum tcpm_state delayed_state;
242 unsigned long delayed_runtime;
243 unsigned long delay_ms;
244
245 spinlock_t pd_event_lock;
246 u32 pd_events;
247
248 struct work_struct event_work;
249 struct delayed_work state_machine;
250 struct delayed_work vdm_state_machine;
251 bool state_machine_running;
252
253 struct completion tx_complete;
254 enum tcpm_transmit_status tx_status;
255
256 struct mutex swap_lock; /* swap command lock */
257 bool swap_pending;
258 bool non_pd_role_swap;
259 struct completion swap_complete;
260 int swap_status;
261
262 unsigned int negotiated_rev;
263 unsigned int message_id;
264 unsigned int caps_count;
265 unsigned int hard_reset_count;
266 bool pd_capable;
267 bool explicit_contract;
268 unsigned int rx_msgid;
269
270 /* Partner capabilities/requests */
271 u32 sink_request;
272 u32 source_caps[PDO_MAX_OBJECTS];
273 unsigned int nr_source_caps;
274 u32 sink_caps[PDO_MAX_OBJECTS];
275 unsigned int nr_sink_caps;
276
277 /* Local capabilities */
278 u32 src_pdo[PDO_MAX_OBJECTS];
279 unsigned int nr_src_pdo;
280 u32 snk_pdo[PDO_MAX_OBJECTS];
281 unsigned int nr_snk_pdo;
282 u32 snk_vdo[VDO_MAX_OBJECTS];
283 unsigned int nr_snk_vdo;
284
285 unsigned int operating_snk_mw;
286 bool update_sink_caps;
287
288 /* Requested current / voltage */
289 u32 current_limit;
290 u32 supply_voltage;
291
292 /* Used to export TA voltage and current */
293 struct power_supply *psy;
294 struct power_supply_desc psy_desc;
295 enum power_supply_usb_type usb_type;
296
297 u32 bist_request;
298
299 /* PD state for Vendor Defined Messages */
300 enum vdm_states vdm_state;
301 u32 vdm_retries;
302 /* next Vendor Defined Message to send */
303 u32 vdo_data[VDO_MAX_SIZE];
304 u8 vdo_count;
305 /* VDO to retry if UFP responder replied busy */
306 u32 vdo_retry;
307
308 /* PPS */
309 struct pd_pps_data pps_data;
310 struct completion pps_complete;
311 bool pps_pending;
312 int pps_status;
313
314 /* Alternate mode data */
315 struct pd_mode_data mode_data;
316 struct typec_altmode *partner_altmode[ALTMODE_DISCOVERY_MAX];
317 struct typec_altmode *port_altmode[ALTMODE_DISCOVERY_MAX];
318
319 /* Deadline in jiffies to exit src_try_wait state */
320 unsigned long max_wait;
321
322 /* port belongs to a self powered device */
323 bool self_powered;
324
325 #ifdef CONFIG_DEBUG_FS
326 struct dentry *dentry;
327 struct mutex logbuffer_lock; /* log buffer access lock */
328 int logbuffer_head;
329 int logbuffer_tail;
330 u8 *logbuffer[LOG_BUFFER_ENTRIES];
331 #endif
332 };
333
334 struct pd_rx_event {
335 struct work_struct work;
336 struct tcpm_port *port;
337 struct pd_message msg;
338 };
339
340 #define tcpm_cc_is_sink(cc) \
341 ((cc) == TYPEC_CC_RP_DEF || (cc) == TYPEC_CC_RP_1_5 || \
342 (cc) == TYPEC_CC_RP_3_0)
343
344 #define tcpm_port_is_sink(port) \
345 ((tcpm_cc_is_sink((port)->cc1) && !tcpm_cc_is_sink((port)->cc2)) || \
346 (tcpm_cc_is_sink((port)->cc2) && !tcpm_cc_is_sink((port)->cc1)))
347
348 #define tcpm_cc_is_source(cc) ((cc) == TYPEC_CC_RD)
349 #define tcpm_cc_is_audio(cc) ((cc) == TYPEC_CC_RA)
350 #define tcpm_cc_is_open(cc) ((cc) == TYPEC_CC_OPEN)
351
352 #define tcpm_port_is_source(port) \
353 ((tcpm_cc_is_source((port)->cc1) && \
354 !tcpm_cc_is_source((port)->cc2)) || \
355 (tcpm_cc_is_source((port)->cc2) && \
356 !tcpm_cc_is_source((port)->cc1)))
357
358 #define tcpm_port_is_debug(port) \
359 (tcpm_cc_is_source((port)->cc1) && tcpm_cc_is_source((port)->cc2))
360
361 #define tcpm_port_is_audio(port) \
362 (tcpm_cc_is_audio((port)->cc1) && tcpm_cc_is_audio((port)->cc2))
363
364 #define tcpm_port_is_audio_detached(port) \
365 ((tcpm_cc_is_audio((port)->cc1) && tcpm_cc_is_open((port)->cc2)) || \
366 (tcpm_cc_is_audio((port)->cc2) && tcpm_cc_is_open((port)->cc1)))
367
368 #define tcpm_try_snk(port) \
369 ((port)->try_snk_count == 0 && (port)->try_role == TYPEC_SINK && \
370 (port)->port_type == TYPEC_PORT_DRP)
371
372 #define tcpm_try_src(port) \
373 ((port)->try_src_count == 0 && (port)->try_role == TYPEC_SOURCE && \
374 (port)->port_type == TYPEC_PORT_DRP)
375
376 #define tcpm_data_role_for_source(port) \
377 ((port)->typec_caps.data == TYPEC_PORT_UFP ? \
378 TYPEC_DEVICE : TYPEC_HOST)
379
380 #define tcpm_data_role_for_sink(port) \
381 ((port)->typec_caps.data == TYPEC_PORT_DFP ? \
382 TYPEC_HOST : TYPEC_DEVICE)
383
384 static enum tcpm_state tcpm_default_state(struct tcpm_port *port)
385 {
386 if (port->port_type == TYPEC_PORT_DRP) {
387 if (port->try_role == TYPEC_SINK)
388 return SNK_UNATTACHED;
389 else if (port->try_role == TYPEC_SOURCE)
390 return SRC_UNATTACHED;
391 /* Fall through to return SRC_UNATTACHED */
392 } else if (port->port_type == TYPEC_PORT_SNK) {
393 return SNK_UNATTACHED;
394 }
395 return SRC_UNATTACHED;
396 }
397
398 static bool tcpm_port_is_disconnected(struct tcpm_port *port)
399 {
400 return (!port->attached && port->cc1 == TYPEC_CC_OPEN &&
401 port->cc2 == TYPEC_CC_OPEN) ||
402 (port->attached && ((port->polarity == TYPEC_POLARITY_CC1 &&
403 port->cc1 == TYPEC_CC_OPEN) ||
404 (port->polarity == TYPEC_POLARITY_CC2 &&
405 port->cc2 == TYPEC_CC_OPEN)));
406 }
407
408 /*
409 * Logging
410 */
411
412 #ifdef CONFIG_DEBUG_FS
413
414 static bool tcpm_log_full(struct tcpm_port *port)
415 {
416 return port->logbuffer_tail ==
417 (port->logbuffer_head + 1) % LOG_BUFFER_ENTRIES;
418 }
419
420 __printf(2, 0)
421 static void _tcpm_log(struct tcpm_port *port, const char *fmt, va_list args)
422 {
423 char tmpbuffer[LOG_BUFFER_ENTRY_SIZE];
424 u64 ts_nsec = local_clock();
425 unsigned long rem_nsec;
426
427 mutex_lock(&port->logbuffer_lock);
428 if (!port->logbuffer[port->logbuffer_head]) {
429 port->logbuffer[port->logbuffer_head] =
430 kzalloc(LOG_BUFFER_ENTRY_SIZE, GFP_KERNEL);
431 if (!port->logbuffer[port->logbuffer_head]) {
432 mutex_unlock(&port->logbuffer_lock);
433 return;
434 }
435 }
436
437 vsnprintf(tmpbuffer, sizeof(tmpbuffer), fmt, args);
438
439 if (tcpm_log_full(port)) {
440 port->logbuffer_head = max(port->logbuffer_head - 1, 0);
441 strcpy(tmpbuffer, "overflow");
442 }
443
444 if (port->logbuffer_head < 0 ||
445 port->logbuffer_head >= LOG_BUFFER_ENTRIES) {
446 dev_warn(port->dev,
447 "Bad log buffer index %d\n", port->logbuffer_head);
448 goto abort;
449 }
450
451 if (!port->logbuffer[port->logbuffer_head]) {
452 dev_warn(port->dev,
453 "Log buffer index %d is NULL\n", port->logbuffer_head);
454 goto abort;
455 }
456
457 rem_nsec = do_div(ts_nsec, 1000000000);
458 scnprintf(port->logbuffer[port->logbuffer_head],
459 LOG_BUFFER_ENTRY_SIZE, "[%5lu.%06lu] %s",
460 (unsigned long)ts_nsec, rem_nsec / 1000,
461 tmpbuffer);
462 port->logbuffer_head = (port->logbuffer_head + 1) % LOG_BUFFER_ENTRIES;
463
464 abort:
465 mutex_unlock(&port->logbuffer_lock);
466 }
467
468 __printf(2, 3)
469 static void tcpm_log(struct tcpm_port *port, const char *fmt, ...)
470 {
471 va_list args;
472
473 /* Do not log while disconnected and unattached */
474 if (tcpm_port_is_disconnected(port) &&
475 (port->state == SRC_UNATTACHED || port->state == SNK_UNATTACHED ||
476 port->state == TOGGLING))
477 return;
478
479 va_start(args, fmt);
480 _tcpm_log(port, fmt, args);
481 va_end(args);
482 }
483
484 __printf(2, 3)
485 static void tcpm_log_force(struct tcpm_port *port, const char *fmt, ...)
486 {
487 va_list args;
488
489 va_start(args, fmt);
490 _tcpm_log(port, fmt, args);
491 va_end(args);
492 }
493
494 static void tcpm_log_source_caps(struct tcpm_port *port)
495 {
496 int i;
497
498 for (i = 0; i < port->nr_source_caps; i++) {
499 u32 pdo = port->source_caps[i];
500 enum pd_pdo_type type = pdo_type(pdo);
501 char msg[64];
502
503 switch (type) {
504 case PDO_TYPE_FIXED:
505 scnprintf(msg, sizeof(msg),
506 "%u mV, %u mA [%s%s%s%s%s%s]",
507 pdo_fixed_voltage(pdo),
508 pdo_max_current(pdo),
509 (pdo & PDO_FIXED_DUAL_ROLE) ?
510 "R" : "",
511 (pdo & PDO_FIXED_SUSPEND) ?
512 "S" : "",
513 (pdo & PDO_FIXED_HIGHER_CAP) ?
514 "H" : "",
515 (pdo & PDO_FIXED_USB_COMM) ?
516 "U" : "",
517 (pdo & PDO_FIXED_DATA_SWAP) ?
518 "D" : "",
519 (pdo & PDO_FIXED_EXTPOWER) ?
520 "E" : "");
521 break;
522 case PDO_TYPE_VAR:
523 scnprintf(msg, sizeof(msg),
524 "%u-%u mV, %u mA",
525 pdo_min_voltage(pdo),
526 pdo_max_voltage(pdo),
527 pdo_max_current(pdo));
528 break;
529 case PDO_TYPE_BATT:
530 scnprintf(msg, sizeof(msg),
531 "%u-%u mV, %u mW",
532 pdo_min_voltage(pdo),
533 pdo_max_voltage(pdo),
534 pdo_max_power(pdo));
535 break;
536 case PDO_TYPE_APDO:
537 if (pdo_apdo_type(pdo) == APDO_TYPE_PPS)
538 scnprintf(msg, sizeof(msg),
539 "%u-%u mV, %u mA",
540 pdo_pps_apdo_min_voltage(pdo),
541 pdo_pps_apdo_max_voltage(pdo),
542 pdo_pps_apdo_max_current(pdo));
543 else
544 strcpy(msg, "undefined APDO");
545 break;
546 default:
547 strcpy(msg, "undefined");
548 break;
549 }
550 tcpm_log(port, " PDO %d: type %d, %s",
551 i, type, msg);
552 }
553 }
554
555 static int tcpm_debug_show(struct seq_file *s, void *v)
556 {
557 struct tcpm_port *port = (struct tcpm_port *)s->private;
558 int tail;
559
560 mutex_lock(&port->logbuffer_lock);
561 tail = port->logbuffer_tail;
562 while (tail != port->logbuffer_head) {
563 seq_printf(s, "%s\n", port->logbuffer[tail]);
564 tail = (tail + 1) % LOG_BUFFER_ENTRIES;
565 }
566 if (!seq_has_overflowed(s))
567 port->logbuffer_tail = tail;
568 mutex_unlock(&port->logbuffer_lock);
569
570 return 0;
571 }
572 DEFINE_SHOW_ATTRIBUTE(tcpm_debug);
573
574 static void tcpm_debugfs_init(struct tcpm_port *port)
575 {
576 char name[NAME_MAX];
577
578 mutex_init(&port->logbuffer_lock);
579 snprintf(name, NAME_MAX, "tcpm-%s", dev_name(port->dev));
580 port->dentry = debugfs_create_file(name, S_IFREG | 0444, usb_debug_root,
581 port, &tcpm_debug_fops);
582 }
583
584 static void tcpm_debugfs_exit(struct tcpm_port *port)
585 {
586 int i;
587
588 mutex_lock(&port->logbuffer_lock);
589 for (i = 0; i < LOG_BUFFER_ENTRIES; i++) {
590 kfree(port->logbuffer[i]);
591 port->logbuffer[i] = NULL;
592 }
593 mutex_unlock(&port->logbuffer_lock);
594
595 debugfs_remove(port->dentry);
596 }
597
598 #else
599
600 __printf(2, 3)
601 static void tcpm_log(const struct tcpm_port *port, const char *fmt, ...) { }
602 __printf(2, 3)
603 static void tcpm_log_force(struct tcpm_port *port, const char *fmt, ...) { }
604 static void tcpm_log_source_caps(struct tcpm_port *port) { }
605 static void tcpm_debugfs_init(const struct tcpm_port *port) { }
606 static void tcpm_debugfs_exit(const struct tcpm_port *port) { }
607
608 #endif
609
610 static int tcpm_pd_transmit(struct tcpm_port *port,
611 enum tcpm_transmit_type type,
612 const struct pd_message *msg)
613 {
614 unsigned long timeout;
615 int ret;
616
617 if (msg)
618 tcpm_log(port, "PD TX, header: %#x", le16_to_cpu(msg->header));
619 else
620 tcpm_log(port, "PD TX, type: %#x", type);
621
622 reinit_completion(&port->tx_complete);
623 ret = port->tcpc->pd_transmit(port->tcpc, type, msg);
624 if (ret < 0)
625 return ret;
626
627 mutex_unlock(&port->lock);
628 timeout = wait_for_completion_timeout(&port->tx_complete,
629 msecs_to_jiffies(PD_T_TCPC_TX_TIMEOUT));
630 mutex_lock(&port->lock);
631 if (!timeout)
632 return -ETIMEDOUT;
633
634 switch (port->tx_status) {
635 case TCPC_TX_SUCCESS:
636 port->message_id = (port->message_id + 1) & PD_HEADER_ID_MASK;
637 return 0;
638 case TCPC_TX_DISCARDED:
639 return -EAGAIN;
640 case TCPC_TX_FAILED:
641 default:
642 return -EIO;
643 }
644 }
645
646 void tcpm_pd_transmit_complete(struct tcpm_port *port,
647 enum tcpm_transmit_status status)
648 {
649 tcpm_log(port, "PD TX complete, status: %u", status);
650 port->tx_status = status;
651 complete(&port->tx_complete);
652 }
653 EXPORT_SYMBOL_GPL(tcpm_pd_transmit_complete);
654
655 static int tcpm_mux_set(struct tcpm_port *port, int state,
656 enum usb_role usb_role,
657 enum typec_orientation orientation)
658 {
659 int ret;
660
661 tcpm_log(port, "Requesting mux state %d, usb-role %d, orientation %d",
662 state, usb_role, orientation);
663
664 ret = typec_set_orientation(port->typec_port, orientation);
665 if (ret)
666 return ret;
667
668 if (port->role_sw) {
669 ret = usb_role_switch_set_role(port->role_sw, usb_role);
670 if (ret)
671 return ret;
672 }
673
674 return typec_set_mode(port->typec_port, state);
675 }
676
677 static int tcpm_set_polarity(struct tcpm_port *port,
678 enum typec_cc_polarity polarity)
679 {
680 int ret;
681
682 tcpm_log(port, "polarity %d", polarity);
683
684 ret = port->tcpc->set_polarity(port->tcpc, polarity);
685 if (ret < 0)
686 return ret;
687
688 port->polarity = polarity;
689
690 return 0;
691 }
692
693 static int tcpm_set_vconn(struct tcpm_port *port, bool enable)
694 {
695 int ret;
696
697 tcpm_log(port, "vconn:=%d", enable);
698
699 ret = port->tcpc->set_vconn(port->tcpc, enable);
700 if (!ret) {
701 port->vconn_role = enable ? TYPEC_SOURCE : TYPEC_SINK;
702 typec_set_vconn_role(port->typec_port, port->vconn_role);
703 }
704
705 return ret;
706 }
707
708 static u32 tcpm_get_current_limit(struct tcpm_port *port)
709 {
710 enum typec_cc_status cc;
711 u32 limit;
712
713 cc = port->polarity ? port->cc2 : port->cc1;
714 switch (cc) {
715 case TYPEC_CC_RP_1_5:
716 limit = 1500;
717 break;
718 case TYPEC_CC_RP_3_0:
719 limit = 3000;
720 break;
721 case TYPEC_CC_RP_DEF:
722 default:
723 if (port->tcpc->get_current_limit)
724 limit = port->tcpc->get_current_limit(port->tcpc);
725 else
726 limit = 0;
727 break;
728 }
729
730 return limit;
731 }
732
733 static int tcpm_set_current_limit(struct tcpm_port *port, u32 max_ma, u32 mv)
734 {
735 int ret = -EOPNOTSUPP;
736
737 tcpm_log(port, "Setting voltage/current limit %u mV %u mA", mv, max_ma);
738
739 port->supply_voltage = mv;
740 port->current_limit = max_ma;
741
742 if (port->tcpc->set_current_limit)
743 ret = port->tcpc->set_current_limit(port->tcpc, max_ma, mv);
744
745 return ret;
746 }
747
748 /*
749 * Determine RP value to set based on maximum current supported
750 * by a port if configured as source.
751 * Returns CC value to report to link partner.
752 */
753 static enum typec_cc_status tcpm_rp_cc(struct tcpm_port *port)
754 {
755 const u32 *src_pdo = port->src_pdo;
756 int nr_pdo = port->nr_src_pdo;
757 int i;
758
759 /*
760 * Search for first entry with matching voltage.
761 * It should report the maximum supported current.
762 */
763 for (i = 0; i < nr_pdo; i++) {
764 const u32 pdo = src_pdo[i];
765
766 if (pdo_type(pdo) == PDO_TYPE_FIXED &&
767 pdo_fixed_voltage(pdo) == 5000) {
768 unsigned int curr = pdo_max_current(pdo);
769
770 if (curr >= 3000)
771 return TYPEC_CC_RP_3_0;
772 else if (curr >= 1500)
773 return TYPEC_CC_RP_1_5;
774 return TYPEC_CC_RP_DEF;
775 }
776 }
777
778 return TYPEC_CC_RP_DEF;
779 }
780
781 static int tcpm_set_attached_state(struct tcpm_port *port, bool attached)
782 {
783 return port->tcpc->set_roles(port->tcpc, attached, port->pwr_role,
784 port->data_role);
785 }
786
787 static int tcpm_set_roles(struct tcpm_port *port, bool attached,
788 enum typec_role role, enum typec_data_role data)
789 {
790 enum typec_orientation orientation;
791 enum usb_role usb_role;
792 int ret;
793
794 if (port->polarity == TYPEC_POLARITY_CC1)
795 orientation = TYPEC_ORIENTATION_NORMAL;
796 else
797 orientation = TYPEC_ORIENTATION_REVERSE;
798
799 if (port->typec_caps.data == TYPEC_PORT_DRD) {
800 if (data == TYPEC_HOST)
801 usb_role = USB_ROLE_HOST;
802 else
803 usb_role = USB_ROLE_DEVICE;
804 } else if (port->typec_caps.data == TYPEC_PORT_DFP) {
805 if (data == TYPEC_HOST) {
806 if (role == TYPEC_SOURCE)
807 usb_role = USB_ROLE_HOST;
808 else
809 usb_role = USB_ROLE_NONE;
810 } else {
811 return -ENOTSUPP;
812 }
813 } else {
814 if (data == TYPEC_DEVICE) {
815 if (role == TYPEC_SINK)
816 usb_role = USB_ROLE_DEVICE;
817 else
818 usb_role = USB_ROLE_NONE;
819 } else {
820 return -ENOTSUPP;
821 }
822 }
823
824 ret = tcpm_mux_set(port, TYPEC_STATE_USB, usb_role, orientation);
825 if (ret < 0)
826 return ret;
827
828 ret = port->tcpc->set_roles(port->tcpc, attached, role, data);
829 if (ret < 0)
830 return ret;
831
832 port->pwr_role = role;
833 port->data_role = data;
834 typec_set_data_role(port->typec_port, data);
835 typec_set_pwr_role(port->typec_port, role);
836
837 return 0;
838 }
839
840 static int tcpm_set_pwr_role(struct tcpm_port *port, enum typec_role role)
841 {
842 int ret;
843
844 ret = port->tcpc->set_roles(port->tcpc, true, role,
845 port->data_role);
846 if (ret < 0)
847 return ret;
848
849 port->pwr_role = role;
850 typec_set_pwr_role(port->typec_port, role);
851
852 return 0;
853 }
854
855 static int tcpm_pd_send_source_caps(struct tcpm_port *port)
856 {
857 struct pd_message msg;
858 int i;
859
860 memset(&msg, 0, sizeof(msg));
861 if (!port->nr_src_pdo) {
862 /* No source capabilities defined, sink only */
863 msg.header = PD_HEADER_LE(PD_CTRL_REJECT,
864 port->pwr_role,
865 port->data_role,
866 port->negotiated_rev,
867 port->message_id, 0);
868 } else {
869 msg.header = PD_HEADER_LE(PD_DATA_SOURCE_CAP,
870 port->pwr_role,
871 port->data_role,
872 port->negotiated_rev,
873 port->message_id,
874 port->nr_src_pdo);
875 }
876 for (i = 0; i < port->nr_src_pdo; i++)
877 msg.payload[i] = cpu_to_le32(port->src_pdo[i]);
878
879 return tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
880 }
881
882 static int tcpm_pd_send_sink_caps(struct tcpm_port *port)
883 {
884 struct pd_message msg;
885 int i;
886
887 memset(&msg, 0, sizeof(msg));
888 if (!port->nr_snk_pdo) {
889 /* No sink capabilities defined, source only */
890 msg.header = PD_HEADER_LE(PD_CTRL_REJECT,
891 port->pwr_role,
892 port->data_role,
893 port->negotiated_rev,
894 port->message_id, 0);
895 } else {
896 msg.header = PD_HEADER_LE(PD_DATA_SINK_CAP,
897 port->pwr_role,
898 port->data_role,
899 port->negotiated_rev,
900 port->message_id,
901 port->nr_snk_pdo);
902 }
903 for (i = 0; i < port->nr_snk_pdo; i++)
904 msg.payload[i] = cpu_to_le32(port->snk_pdo[i]);
905
906 return tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
907 }
908
909 static void tcpm_set_state(struct tcpm_port *port, enum tcpm_state state,
910 unsigned int delay_ms)
911 {
912 if (delay_ms) {
913 tcpm_log(port, "pending state change %s -> %s @ %u ms",
914 tcpm_states[port->state], tcpm_states[state],
915 delay_ms);
916 port->delayed_state = state;
917 mod_delayed_work(port->wq, &port->state_machine,
918 msecs_to_jiffies(delay_ms));
919 port->delayed_runtime = jiffies + msecs_to_jiffies(delay_ms);
920 port->delay_ms = delay_ms;
921 } else {
922 tcpm_log(port, "state change %s -> %s",
923 tcpm_states[port->state], tcpm_states[state]);
924 port->delayed_state = INVALID_STATE;
925 port->prev_state = port->state;
926 port->state = state;
927 /*
928 * Don't re-queue the state machine work item if we're currently
929 * in the state machine and we're immediately changing states.
930 * tcpm_state_machine_work() will continue running the state
931 * machine.
932 */
933 if (!port->state_machine_running)
934 mod_delayed_work(port->wq, &port->state_machine, 0);
935 }
936 }
937
938 static void tcpm_set_state_cond(struct tcpm_port *port, enum tcpm_state state,
939 unsigned int delay_ms)
940 {
941 if (port->enter_state == port->state)
942 tcpm_set_state(port, state, delay_ms);
943 else
944 tcpm_log(port,
945 "skipped %sstate change %s -> %s [%u ms], context state %s",
946 delay_ms ? "delayed " : "",
947 tcpm_states[port->state], tcpm_states[state],
948 delay_ms, tcpm_states[port->enter_state]);
949 }
950
951 static void tcpm_queue_message(struct tcpm_port *port,
952 enum pd_msg_request message)
953 {
954 port->queued_message = message;
955 mod_delayed_work(port->wq, &port->state_machine, 0);
956 }
957
958 /*
959 * VDM/VDO handling functions
960 */
961 static void tcpm_queue_vdm(struct tcpm_port *port, const u32 header,
962 const u32 *data, int cnt)
963 {
964 port->vdo_count = cnt + 1;
965 port->vdo_data[0] = header;
966 memcpy(&port->vdo_data[1], data, sizeof(u32) * cnt);
967 /* Set ready, vdm state machine will actually send */
968 port->vdm_retries = 0;
969 port->vdm_state = VDM_STATE_READY;
970 }
971
972 static void svdm_consume_identity(struct tcpm_port *port, const __le32 *payload,
973 int cnt)
974 {
975 u32 vdo = le32_to_cpu(payload[VDO_INDEX_IDH]);
976 u32 product = le32_to_cpu(payload[VDO_INDEX_PRODUCT]);
977
978 memset(&port->mode_data, 0, sizeof(port->mode_data));
979
980 port->partner_ident.id_header = vdo;
981 port->partner_ident.cert_stat = le32_to_cpu(payload[VDO_INDEX_CSTAT]);
982 port->partner_ident.product = product;
983
984 typec_partner_set_identity(port->partner);
985
986 tcpm_log(port, "Identity: %04x:%04x.%04x",
987 PD_IDH_VID(vdo),
988 PD_PRODUCT_PID(product), product & 0xffff);
989 }
990
991 static bool svdm_consume_svids(struct tcpm_port *port, const __le32 *payload,
992 int cnt)
993 {
994 struct pd_mode_data *pmdata = &port->mode_data;
995 int i;
996
997 for (i = 1; i < cnt; i++) {
998 u32 p = le32_to_cpu(payload[i]);
999 u16 svid;
1000
1001 svid = (p >> 16) & 0xffff;
1002 if (!svid)
1003 return false;
1004
1005 if (pmdata->nsvids >= SVID_DISCOVERY_MAX)
1006 goto abort;
1007
1008 pmdata->svids[pmdata->nsvids++] = svid;
1009 tcpm_log(port, "SVID %d: 0x%x", pmdata->nsvids, svid);
1010
1011 svid = p & 0xffff;
1012 if (!svid)
1013 return false;
1014
1015 if (pmdata->nsvids >= SVID_DISCOVERY_MAX)
1016 goto abort;
1017
1018 pmdata->svids[pmdata->nsvids++] = svid;
1019 tcpm_log(port, "SVID %d: 0x%x", pmdata->nsvids, svid);
1020 }
1021 return true;
1022 abort:
1023 tcpm_log(port, "SVID_DISCOVERY_MAX(%d) too low!", SVID_DISCOVERY_MAX);
1024 return false;
1025 }
1026
1027 static void svdm_consume_modes(struct tcpm_port *port, const __le32 *payload,
1028 int cnt)
1029 {
1030 struct pd_mode_data *pmdata = &port->mode_data;
1031 struct typec_altmode_desc *paltmode;
1032 int i;
1033
1034 if (pmdata->altmodes >= ARRAY_SIZE(port->partner_altmode)) {
1035 /* Already logged in svdm_consume_svids() */
1036 return;
1037 }
1038
1039 for (i = 1; i < cnt; i++) {
1040 paltmode = &pmdata->altmode_desc[pmdata->altmodes];
1041 memset(paltmode, 0, sizeof(*paltmode));
1042
1043 paltmode->svid = pmdata->svids[pmdata->svid_index];
1044 paltmode->mode = i;
1045 paltmode->vdo = le32_to_cpu(payload[i]);
1046
1047 tcpm_log(port, " Alternate mode %d: SVID 0x%04x, VDO %d: 0x%08x",
1048 pmdata->altmodes, paltmode->svid,
1049 paltmode->mode, paltmode->vdo);
1050
1051 pmdata->altmodes++;
1052 }
1053 }
1054
1055 static void tcpm_register_partner_altmodes(struct tcpm_port *port)
1056 {
1057 struct pd_mode_data *modep = &port->mode_data;
1058 struct typec_altmode *altmode;
1059 int i;
1060
1061 for (i = 0; i < modep->altmodes; i++) {
1062 altmode = typec_partner_register_altmode(port->partner,
1063 &modep->altmode_desc[i]);
1064 if (!altmode)
1065 tcpm_log(port, "Failed to register partner SVID 0x%04x",
1066 modep->altmode_desc[i].svid);
1067 port->partner_altmode[i] = altmode;
1068 }
1069 }
1070
1071 #define supports_modal(port) PD_IDH_MODAL_SUPP((port)->partner_ident.id_header)
1072
1073 static int tcpm_pd_svdm(struct tcpm_port *port, const __le32 *payload, int cnt,
1074 u32 *response)
1075 {
1076 struct typec_altmode *adev;
1077 struct typec_altmode *pdev;
1078 struct pd_mode_data *modep;
1079 u32 p[PD_MAX_PAYLOAD];
1080 int rlen = 0;
1081 int cmd_type;
1082 int cmd;
1083 int i;
1084
1085 for (i = 0; i < cnt; i++)
1086 p[i] = le32_to_cpu(payload[i]);
1087
1088 cmd_type = PD_VDO_CMDT(p[0]);
1089 cmd = PD_VDO_CMD(p[0]);
1090
1091 tcpm_log(port, "Rx VDM cmd 0x%x type %d cmd %d len %d",
1092 p[0], cmd_type, cmd, cnt);
1093
1094 modep = &port->mode_data;
1095
1096 adev = typec_match_altmode(port->port_altmode, ALTMODE_DISCOVERY_MAX,
1097 PD_VDO_VID(p[0]), PD_VDO_OPOS(p[0]));
1098
1099 pdev = typec_match_altmode(port->partner_altmode, ALTMODE_DISCOVERY_MAX,
1100 PD_VDO_VID(p[0]), PD_VDO_OPOS(p[0]));
1101
1102 switch (cmd_type) {
1103 case CMDT_INIT:
1104 switch (cmd) {
1105 case CMD_DISCOVER_IDENT:
1106 /* 6.4.4.3.1: Only respond as UFP (device) */
1107 if (port->data_role == TYPEC_DEVICE &&
1108 port->nr_snk_vdo) {
1109 for (i = 0; i < port->nr_snk_vdo; i++)
1110 response[i + 1] = port->snk_vdo[i];
1111 rlen = port->nr_snk_vdo + 1;
1112 }
1113 break;
1114 case CMD_DISCOVER_SVID:
1115 break;
1116 case CMD_DISCOVER_MODES:
1117 break;
1118 case CMD_ENTER_MODE:
1119 break;
1120 case CMD_EXIT_MODE:
1121 break;
1122 case CMD_ATTENTION:
1123 /* Attention command does not have response */
1124 if (adev)
1125 typec_altmode_attention(adev, p[1]);
1126 return 0;
1127 default:
1128 break;
1129 }
1130 if (rlen >= 1) {
1131 response[0] = p[0] | VDO_CMDT(CMDT_RSP_ACK);
1132 } else if (rlen == 0) {
1133 response[0] = p[0] | VDO_CMDT(CMDT_RSP_NAK);
1134 rlen = 1;
1135 } else {
1136 response[0] = p[0] | VDO_CMDT(CMDT_RSP_BUSY);
1137 rlen = 1;
1138 }
1139 break;
1140 case CMDT_RSP_ACK:
1141 /* silently drop message if we are not connected */
1142 if (IS_ERR_OR_NULL(port->partner))
1143 break;
1144
1145 switch (cmd) {
1146 case CMD_DISCOVER_IDENT:
1147 /* 6.4.4.3.1 */
1148 svdm_consume_identity(port, payload, cnt);
1149 response[0] = VDO(USB_SID_PD, 1, CMD_DISCOVER_SVID);
1150 rlen = 1;
1151 break;
1152 case CMD_DISCOVER_SVID:
1153 /* 6.4.4.3.2 */
1154 if (svdm_consume_svids(port, payload, cnt)) {
1155 response[0] = VDO(USB_SID_PD, 1,
1156 CMD_DISCOVER_SVID);
1157 rlen = 1;
1158 } else if (modep->nsvids && supports_modal(port)) {
1159 response[0] = VDO(modep->svids[0], 1,
1160 CMD_DISCOVER_MODES);
1161 rlen = 1;
1162 }
1163 break;
1164 case CMD_DISCOVER_MODES:
1165 /* 6.4.4.3.3 */
1166 svdm_consume_modes(port, payload, cnt);
1167 modep->svid_index++;
1168 if (modep->svid_index < modep->nsvids) {
1169 u16 svid = modep->svids[modep->svid_index];
1170 response[0] = VDO(svid, 1, CMD_DISCOVER_MODES);
1171 rlen = 1;
1172 } else {
1173 tcpm_register_partner_altmodes(port);
1174 }
1175 break;
1176 case CMD_ENTER_MODE:
1177 if (adev && pdev) {
1178 typec_altmode_update_active(pdev, true);
1179
1180 if (typec_altmode_vdm(adev, p[0], &p[1], cnt)) {
1181 response[0] = VDO(adev->svid, 1,
1182 CMD_EXIT_MODE);
1183 response[0] |= VDO_OPOS(adev->mode);
1184 return 1;
1185 }
1186 }
1187 return 0;
1188 case CMD_EXIT_MODE:
1189 if (adev && pdev) {
1190 typec_altmode_update_active(pdev, false);
1191
1192 /* Back to USB Operation */
1193 WARN_ON(typec_altmode_notify(adev,
1194 TYPEC_STATE_USB,
1195 NULL));
1196 }
1197 break;
1198 default:
1199 break;
1200 }
1201 break;
1202 case CMDT_RSP_NAK:
1203 switch (cmd) {
1204 case CMD_ENTER_MODE:
1205 /* Back to USB Operation */
1206 if (adev)
1207 WARN_ON(typec_altmode_notify(adev,
1208 TYPEC_STATE_USB,
1209 NULL));
1210 break;
1211 default:
1212 break;
1213 }
1214 break;
1215 default:
1216 break;
1217 }
1218
1219 /* Informing the alternate mode drivers about everything */
1220 if (adev)
1221 typec_altmode_vdm(adev, p[0], &p[1], cnt);
1222
1223 return rlen;
1224 }
1225
1226 static void tcpm_handle_vdm_request(struct tcpm_port *port,
1227 const __le32 *payload, int cnt)
1228 {
1229 int rlen = 0;
1230 u32 response[8] = { };
1231 u32 p0 = le32_to_cpu(payload[0]);
1232
1233 if (port->vdm_state == VDM_STATE_BUSY) {
1234 /* If UFP responded busy retry after timeout */
1235 if (PD_VDO_CMDT(p0) == CMDT_RSP_BUSY) {
1236 port->vdm_state = VDM_STATE_WAIT_RSP_BUSY;
1237 port->vdo_retry = (p0 & ~VDO_CMDT_MASK) |
1238 CMDT_INIT;
1239 mod_delayed_work(port->wq, &port->vdm_state_machine,
1240 msecs_to_jiffies(PD_T_VDM_BUSY));
1241 return;
1242 }
1243 port->vdm_state = VDM_STATE_DONE;
1244 }
1245
1246 if (PD_VDO_SVDM(p0))
1247 rlen = tcpm_pd_svdm(port, payload, cnt, response);
1248
1249 if (rlen > 0) {
1250 tcpm_queue_vdm(port, response[0], &response[1], rlen - 1);
1251 mod_delayed_work(port->wq, &port->vdm_state_machine, 0);
1252 }
1253 }
1254
1255 static void tcpm_send_vdm(struct tcpm_port *port, u32 vid, int cmd,
1256 const u32 *data, int count)
1257 {
1258 u32 header;
1259
1260 if (WARN_ON(count > VDO_MAX_SIZE - 1))
1261 count = VDO_MAX_SIZE - 1;
1262
1263 /* set VDM header with VID & CMD */
1264 header = VDO(vid, ((vid & USB_SID_PD) == USB_SID_PD) ?
1265 1 : (PD_VDO_CMD(cmd) <= CMD_ATTENTION), cmd);
1266 tcpm_queue_vdm(port, header, data, count);
1267
1268 mod_delayed_work(port->wq, &port->vdm_state_machine, 0);
1269 }
1270
1271 static unsigned int vdm_ready_timeout(u32 vdm_hdr)
1272 {
1273 unsigned int timeout;
1274 int cmd = PD_VDO_CMD(vdm_hdr);
1275
1276 /* its not a structured VDM command */
1277 if (!PD_VDO_SVDM(vdm_hdr))
1278 return PD_T_VDM_UNSTRUCTURED;
1279
1280 switch (PD_VDO_CMDT(vdm_hdr)) {
1281 case CMDT_INIT:
1282 if (cmd == CMD_ENTER_MODE || cmd == CMD_EXIT_MODE)
1283 timeout = PD_T_VDM_WAIT_MODE_E;
1284 else
1285 timeout = PD_T_VDM_SNDR_RSP;
1286 break;
1287 default:
1288 if (cmd == CMD_ENTER_MODE || cmd == CMD_EXIT_MODE)
1289 timeout = PD_T_VDM_E_MODE;
1290 else
1291 timeout = PD_T_VDM_RCVR_RSP;
1292 break;
1293 }
1294 return timeout;
1295 }
1296
1297 static void vdm_run_state_machine(struct tcpm_port *port)
1298 {
1299 struct pd_message msg;
1300 int i, res;
1301
1302 switch (port->vdm_state) {
1303 case VDM_STATE_READY:
1304 /* Only transmit VDM if attached */
1305 if (!port->attached) {
1306 port->vdm_state = VDM_STATE_ERR_BUSY;
1307 break;
1308 }
1309
1310 /*
1311 * if there's traffic or we're not in PDO ready state don't send
1312 * a VDM.
1313 */
1314 if (port->state != SRC_READY && port->state != SNK_READY)
1315 break;
1316
1317 /* Prepare and send VDM */
1318 memset(&msg, 0, sizeof(msg));
1319 msg.header = PD_HEADER_LE(PD_DATA_VENDOR_DEF,
1320 port->pwr_role,
1321 port->data_role,
1322 port->negotiated_rev,
1323 port->message_id, port->vdo_count);
1324 for (i = 0; i < port->vdo_count; i++)
1325 msg.payload[i] = cpu_to_le32(port->vdo_data[i]);
1326 res = tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
1327 if (res < 0) {
1328 port->vdm_state = VDM_STATE_ERR_SEND;
1329 } else {
1330 unsigned long timeout;
1331
1332 port->vdm_retries = 0;
1333 port->vdm_state = VDM_STATE_BUSY;
1334 timeout = vdm_ready_timeout(port->vdo_data[0]);
1335 mod_delayed_work(port->wq, &port->vdm_state_machine,
1336 timeout);
1337 }
1338 break;
1339 case VDM_STATE_WAIT_RSP_BUSY:
1340 port->vdo_data[0] = port->vdo_retry;
1341 port->vdo_count = 1;
1342 port->vdm_state = VDM_STATE_READY;
1343 break;
1344 case VDM_STATE_BUSY:
1345 port->vdm_state = VDM_STATE_ERR_TMOUT;
1346 break;
1347 case VDM_STATE_ERR_SEND:
1348 /*
1349 * A partner which does not support USB PD will not reply,
1350 * so this is not a fatal error. At the same time, some
1351 * devices may not return GoodCRC under some circumstances,
1352 * so we need to retry.
1353 */
1354 if (port->vdm_retries < 3) {
1355 tcpm_log(port, "VDM Tx error, retry");
1356 port->vdm_retries++;
1357 port->vdm_state = VDM_STATE_READY;
1358 }
1359 break;
1360 default:
1361 break;
1362 }
1363 }
1364
1365 static void vdm_state_machine_work(struct work_struct *work)
1366 {
1367 struct tcpm_port *port = container_of(work, struct tcpm_port,
1368 vdm_state_machine.work);
1369 enum vdm_states prev_state;
1370
1371 mutex_lock(&port->lock);
1372
1373 /*
1374 * Continue running as long as the port is not busy and there was
1375 * a state change.
1376 */
1377 do {
1378 prev_state = port->vdm_state;
1379 vdm_run_state_machine(port);
1380 } while (port->vdm_state != prev_state &&
1381 port->vdm_state != VDM_STATE_BUSY);
1382
1383 mutex_unlock(&port->lock);
1384 }
1385
1386 enum pdo_err {
1387 PDO_NO_ERR,
1388 PDO_ERR_NO_VSAFE5V,
1389 PDO_ERR_VSAFE5V_NOT_FIRST,
1390 PDO_ERR_PDO_TYPE_NOT_IN_ORDER,
1391 PDO_ERR_FIXED_NOT_SORTED,
1392 PDO_ERR_VARIABLE_BATT_NOT_SORTED,
1393 PDO_ERR_DUPE_PDO,
1394 PDO_ERR_PPS_APDO_NOT_SORTED,
1395 PDO_ERR_DUPE_PPS_APDO,
1396 };
1397
1398 static const char * const pdo_err_msg[] = {
1399 [PDO_ERR_NO_VSAFE5V] =
1400 " err: source/sink caps should atleast have vSafe5V",
1401 [PDO_ERR_VSAFE5V_NOT_FIRST] =
1402 " err: vSafe5V Fixed Supply Object Shall always be the first object",
1403 [PDO_ERR_PDO_TYPE_NOT_IN_ORDER] =
1404 " err: PDOs should be in the following order: Fixed; Battery; Variable",
1405 [PDO_ERR_FIXED_NOT_SORTED] =
1406 " err: Fixed supply pdos should be in increasing order of their fixed voltage",
1407 [PDO_ERR_VARIABLE_BATT_NOT_SORTED] =
1408 " err: Variable/Battery supply pdos should be in increasing order of their minimum voltage",
1409 [PDO_ERR_DUPE_PDO] =
1410 " err: Variable/Batt supply pdos cannot have same min/max voltage",
1411 [PDO_ERR_PPS_APDO_NOT_SORTED] =
1412 " err: Programmable power supply apdos should be in increasing order of their maximum voltage",
1413 [PDO_ERR_DUPE_PPS_APDO] =
1414 " err: Programmable power supply apdos cannot have same min/max voltage and max current",
1415 };
1416
1417 static enum pdo_err tcpm_caps_err(struct tcpm_port *port, const u32 *pdo,
1418 unsigned int nr_pdo)
1419 {
1420 unsigned int i;
1421
1422 /* Should at least contain vSafe5v */
1423 if (nr_pdo < 1)
1424 return PDO_ERR_NO_VSAFE5V;
1425
1426 /* The vSafe5V Fixed Supply Object Shall always be the first object */
1427 if (pdo_type(pdo[0]) != PDO_TYPE_FIXED ||
1428 pdo_fixed_voltage(pdo[0]) != VSAFE5V)
1429 return PDO_ERR_VSAFE5V_NOT_FIRST;
1430
1431 for (i = 1; i < nr_pdo; i++) {
1432 if (pdo_type(pdo[i]) < pdo_type(pdo[i - 1])) {
1433 return PDO_ERR_PDO_TYPE_NOT_IN_ORDER;
1434 } else if (pdo_type(pdo[i]) == pdo_type(pdo[i - 1])) {
1435 enum pd_pdo_type type = pdo_type(pdo[i]);
1436
1437 switch (type) {
1438 /*
1439 * The remaining Fixed Supply Objects, if
1440 * present, shall be sent in voltage order;
1441 * lowest to highest.
1442 */
1443 case PDO_TYPE_FIXED:
1444 if (pdo_fixed_voltage(pdo[i]) <=
1445 pdo_fixed_voltage(pdo[i - 1]))
1446 return PDO_ERR_FIXED_NOT_SORTED;
1447 break;
1448 /*
1449 * The Battery Supply Objects and Variable
1450 * supply, if present shall be sent in Minimum
1451 * Voltage order; lowest to highest.
1452 */
1453 case PDO_TYPE_VAR:
1454 case PDO_TYPE_BATT:
1455 if (pdo_min_voltage(pdo[i]) <
1456 pdo_min_voltage(pdo[i - 1]))
1457 return PDO_ERR_VARIABLE_BATT_NOT_SORTED;
1458 else if ((pdo_min_voltage(pdo[i]) ==
1459 pdo_min_voltage(pdo[i - 1])) &&
1460 (pdo_max_voltage(pdo[i]) ==
1461 pdo_max_voltage(pdo[i - 1])))
1462 return PDO_ERR_DUPE_PDO;
1463 break;
1464 /*
1465 * The Programmable Power Supply APDOs, if present,
1466 * shall be sent in Maximum Voltage order;
1467 * lowest to highest.
1468 */
1469 case PDO_TYPE_APDO:
1470 if (pdo_apdo_type(pdo[i]) != APDO_TYPE_PPS)
1471 break;
1472
1473 if (pdo_pps_apdo_max_voltage(pdo[i]) <
1474 pdo_pps_apdo_max_voltage(pdo[i - 1]))
1475 return PDO_ERR_PPS_APDO_NOT_SORTED;
1476 else if (pdo_pps_apdo_min_voltage(pdo[i]) ==
1477 pdo_pps_apdo_min_voltage(pdo[i - 1]) &&
1478 pdo_pps_apdo_max_voltage(pdo[i]) ==
1479 pdo_pps_apdo_max_voltage(pdo[i - 1]) &&
1480 pdo_pps_apdo_max_current(pdo[i]) ==
1481 pdo_pps_apdo_max_current(pdo[i - 1]))
1482 return PDO_ERR_DUPE_PPS_APDO;
1483 break;
1484 default:
1485 tcpm_log_force(port, " Unknown pdo type");
1486 }
1487 }
1488 }
1489
1490 return PDO_NO_ERR;
1491 }
1492
1493 static int tcpm_validate_caps(struct tcpm_port *port, const u32 *pdo,
1494 unsigned int nr_pdo)
1495 {
1496 enum pdo_err err_index = tcpm_caps_err(port, pdo, nr_pdo);
1497
1498 if (err_index != PDO_NO_ERR) {
1499 tcpm_log_force(port, " %s", pdo_err_msg[err_index]);
1500 return -EINVAL;
1501 }
1502
1503 return 0;
1504 }
1505
1506 static int tcpm_altmode_enter(struct typec_altmode *altmode, u32 *vdo)
1507 {
1508 struct tcpm_port *port = typec_altmode_get_drvdata(altmode);
1509 u32 header;
1510
1511 mutex_lock(&port->lock);
1512 header = VDO(altmode->svid, vdo ? 2 : 1, CMD_ENTER_MODE);
1513 header |= VDO_OPOS(altmode->mode);
1514
1515 tcpm_queue_vdm(port, header, vdo, vdo ? 1 : 0);
1516 mod_delayed_work(port->wq, &port->vdm_state_machine, 0);
1517 mutex_unlock(&port->lock);
1518
1519 return 0;
1520 }
1521
1522 static int tcpm_altmode_exit(struct typec_altmode *altmode)
1523 {
1524 struct tcpm_port *port = typec_altmode_get_drvdata(altmode);
1525 u32 header;
1526
1527 mutex_lock(&port->lock);
1528 header = VDO(altmode->svid, 1, CMD_EXIT_MODE);
1529 header |= VDO_OPOS(altmode->mode);
1530
1531 tcpm_queue_vdm(port, header, NULL, 0);
1532 mod_delayed_work(port->wq, &port->vdm_state_machine, 0);
1533 mutex_unlock(&port->lock);
1534
1535 return 0;
1536 }
1537
1538 static int tcpm_altmode_vdm(struct typec_altmode *altmode,
1539 u32 header, const u32 *data, int count)
1540 {
1541 struct tcpm_port *port = typec_altmode_get_drvdata(altmode);
1542
1543 mutex_lock(&port->lock);
1544 tcpm_queue_vdm(port, header, data, count - 1);
1545 mod_delayed_work(port->wq, &port->vdm_state_machine, 0);
1546 mutex_unlock(&port->lock);
1547
1548 return 0;
1549 }
1550
1551 static const struct typec_altmode_ops tcpm_altmode_ops = {
1552 .enter = tcpm_altmode_enter,
1553 .exit = tcpm_altmode_exit,
1554 .vdm = tcpm_altmode_vdm,
1555 };
1556
1557 /*
1558 * PD (data, control) command handling functions
1559 */
1560 static inline enum tcpm_state ready_state(struct tcpm_port *port)
1561 {
1562 if (port->pwr_role == TYPEC_SOURCE)
1563 return SRC_READY;
1564 else
1565 return SNK_READY;
1566 }
1567
1568 static int tcpm_pd_send_control(struct tcpm_port *port,
1569 enum pd_ctrl_msg_type type);
1570
1571 static void tcpm_handle_alert(struct tcpm_port *port, const __le32 *payload,
1572 int cnt)
1573 {
1574 u32 p0 = le32_to_cpu(payload[0]);
1575 unsigned int type = usb_pd_ado_type(p0);
1576
1577 if (!type) {
1578 tcpm_log(port, "Alert message received with no type");
1579 return;
1580 }
1581
1582 /* Just handling non-battery alerts for now */
1583 if (!(type & USB_PD_ADO_TYPE_BATT_STATUS_CHANGE)) {
1584 switch (port->state) {
1585 case SRC_READY:
1586 case SNK_READY:
1587 tcpm_set_state(port, GET_STATUS_SEND, 0);
1588 break;
1589 default:
1590 tcpm_queue_message(port, PD_MSG_CTRL_WAIT);
1591 break;
1592 }
1593 }
1594 }
1595
1596 static void tcpm_pd_data_request(struct tcpm_port *port,
1597 const struct pd_message *msg)
1598 {
1599 enum pd_data_msg_type type = pd_header_type_le(msg->header);
1600 unsigned int cnt = pd_header_cnt_le(msg->header);
1601 unsigned int rev = pd_header_rev_le(msg->header);
1602 unsigned int i;
1603
1604 switch (type) {
1605 case PD_DATA_SOURCE_CAP:
1606 if (port->pwr_role != TYPEC_SINK)
1607 break;
1608
1609 for (i = 0; i < cnt; i++)
1610 port->source_caps[i] = le32_to_cpu(msg->payload[i]);
1611
1612 port->nr_source_caps = cnt;
1613
1614 tcpm_log_source_caps(port);
1615
1616 tcpm_validate_caps(port, port->source_caps,
1617 port->nr_source_caps);
1618
1619 /*
1620 * Adjust revision in subsequent message headers, as required,
1621 * to comply with 6.2.1.1.5 of the USB PD 3.0 spec. We don't
1622 * support Rev 1.0 so just do nothing in that scenario.
1623 */
1624 if (rev == PD_REV10)
1625 break;
1626
1627 if (rev < PD_MAX_REV)
1628 port->negotiated_rev = rev;
1629
1630 /*
1631 * This message may be received even if VBUS is not
1632 * present. This is quite unexpected; see USB PD
1633 * specification, sections 8.3.3.6.3.1 and 8.3.3.6.3.2.
1634 * However, at the same time, we must be ready to
1635 * receive this message and respond to it 15ms after
1636 * receiving PS_RDY during power swap operations, no matter
1637 * if VBUS is available or not (USB PD specification,
1638 * section 6.5.9.2).
1639 * So we need to accept the message either way,
1640 * but be prepared to keep waiting for VBUS after it was
1641 * handled.
1642 */
1643 tcpm_set_state(port, SNK_NEGOTIATE_CAPABILITIES, 0);
1644 break;
1645 case PD_DATA_REQUEST:
1646 if (port->pwr_role != TYPEC_SOURCE ||
1647 cnt != 1) {
1648 tcpm_queue_message(port, PD_MSG_CTRL_REJECT);
1649 break;
1650 }
1651
1652 /*
1653 * Adjust revision in subsequent message headers, as required,
1654 * to comply with 6.2.1.1.5 of the USB PD 3.0 spec. We don't
1655 * support Rev 1.0 so just reject in that scenario.
1656 */
1657 if (rev == PD_REV10) {
1658 tcpm_queue_message(port, PD_MSG_CTRL_REJECT);
1659 break;
1660 }
1661
1662 if (rev < PD_MAX_REV)
1663 port->negotiated_rev = rev;
1664
1665 port->sink_request = le32_to_cpu(msg->payload[0]);
1666 tcpm_set_state(port, SRC_NEGOTIATE_CAPABILITIES, 0);
1667 break;
1668 case PD_DATA_SINK_CAP:
1669 /* We don't do anything with this at the moment... */
1670 for (i = 0; i < cnt; i++)
1671 port->sink_caps[i] = le32_to_cpu(msg->payload[i]);
1672 port->nr_sink_caps = cnt;
1673 break;
1674 case PD_DATA_VENDOR_DEF:
1675 tcpm_handle_vdm_request(port, msg->payload, cnt);
1676 break;
1677 case PD_DATA_BIST:
1678 if (port->state == SRC_READY || port->state == SNK_READY) {
1679 port->bist_request = le32_to_cpu(msg->payload[0]);
1680 tcpm_set_state(port, BIST_RX, 0);
1681 }
1682 break;
1683 case PD_DATA_ALERT:
1684 tcpm_handle_alert(port, msg->payload, cnt);
1685 break;
1686 case PD_DATA_BATT_STATUS:
1687 case PD_DATA_GET_COUNTRY_INFO:
1688 /* Currently unsupported */
1689 tcpm_queue_message(port, PD_MSG_CTRL_NOT_SUPP);
1690 break;
1691 default:
1692 tcpm_log(port, "Unhandled data message type %#x", type);
1693 break;
1694 }
1695 }
1696
1697 static void tcpm_pps_complete(struct tcpm_port *port, int result)
1698 {
1699 if (port->pps_pending) {
1700 port->pps_status = result;
1701 port->pps_pending = false;
1702 complete(&port->pps_complete);
1703 }
1704 }
1705
1706 static void tcpm_pd_ctrl_request(struct tcpm_port *port,
1707 const struct pd_message *msg)
1708 {
1709 enum pd_ctrl_msg_type type = pd_header_type_le(msg->header);
1710 enum tcpm_state next_state;
1711
1712 switch (type) {
1713 case PD_CTRL_GOOD_CRC:
1714 case PD_CTRL_PING:
1715 break;
1716 case PD_CTRL_GET_SOURCE_CAP:
1717 switch (port->state) {
1718 case SRC_READY:
1719 case SNK_READY:
1720 tcpm_queue_message(port, PD_MSG_DATA_SOURCE_CAP);
1721 break;
1722 default:
1723 tcpm_queue_message(port, PD_MSG_CTRL_REJECT);
1724 break;
1725 }
1726 break;
1727 case PD_CTRL_GET_SINK_CAP:
1728 switch (port->state) {
1729 case SRC_READY:
1730 case SNK_READY:
1731 tcpm_queue_message(port, PD_MSG_DATA_SINK_CAP);
1732 break;
1733 default:
1734 tcpm_queue_message(port, PD_MSG_CTRL_REJECT);
1735 break;
1736 }
1737 break;
1738 case PD_CTRL_GOTO_MIN:
1739 break;
1740 case PD_CTRL_PS_RDY:
1741 switch (port->state) {
1742 case SNK_TRANSITION_SINK:
1743 if (port->vbus_present) {
1744 tcpm_set_current_limit(port,
1745 port->current_limit,
1746 port->supply_voltage);
1747 port->explicit_contract = true;
1748 tcpm_set_state(port, SNK_READY, 0);
1749 } else {
1750 /*
1751 * Seen after power swap. Keep waiting for VBUS
1752 * in a transitional state.
1753 */
1754 tcpm_set_state(port,
1755 SNK_TRANSITION_SINK_VBUS, 0);
1756 }
1757 break;
1758 case PR_SWAP_SRC_SNK_SOURCE_OFF_CC_DEBOUNCED:
1759 tcpm_set_state(port, PR_SWAP_SRC_SNK_SINK_ON, 0);
1760 break;
1761 case PR_SWAP_SNK_SRC_SINK_OFF:
1762 tcpm_set_state(port, PR_SWAP_SNK_SRC_SOURCE_ON, 0);
1763 break;
1764 case VCONN_SWAP_WAIT_FOR_VCONN:
1765 tcpm_set_state(port, VCONN_SWAP_TURN_OFF_VCONN, 0);
1766 break;
1767 default:
1768 break;
1769 }
1770 break;
1771 case PD_CTRL_REJECT:
1772 case PD_CTRL_WAIT:
1773 case PD_CTRL_NOT_SUPP:
1774 switch (port->state) {
1775 case SNK_NEGOTIATE_CAPABILITIES:
1776 /* USB PD specification, Figure 8-43 */
1777 if (port->explicit_contract)
1778 next_state = SNK_READY;
1779 else
1780 next_state = SNK_WAIT_CAPABILITIES;
1781 tcpm_set_state(port, next_state, 0);
1782 break;
1783 case SNK_NEGOTIATE_PPS_CAPABILITIES:
1784 /* Revert data back from any requested PPS updates */
1785 port->pps_data.out_volt = port->supply_voltage;
1786 port->pps_data.op_curr = port->current_limit;
1787 port->pps_status = (type == PD_CTRL_WAIT ?
1788 -EAGAIN : -EOPNOTSUPP);
1789 tcpm_set_state(port, SNK_READY, 0);
1790 break;
1791 case DR_SWAP_SEND:
1792 port->swap_status = (type == PD_CTRL_WAIT ?
1793 -EAGAIN : -EOPNOTSUPP);
1794 tcpm_set_state(port, DR_SWAP_CANCEL, 0);
1795 break;
1796 case PR_SWAP_SEND:
1797 port->swap_status = (type == PD_CTRL_WAIT ?
1798 -EAGAIN : -EOPNOTSUPP);
1799 tcpm_set_state(port, PR_SWAP_CANCEL, 0);
1800 break;
1801 case VCONN_SWAP_SEND:
1802 port->swap_status = (type == PD_CTRL_WAIT ?
1803 -EAGAIN : -EOPNOTSUPP);
1804 tcpm_set_state(port, VCONN_SWAP_CANCEL, 0);
1805 break;
1806 default:
1807 break;
1808 }
1809 break;
1810 case PD_CTRL_ACCEPT:
1811 switch (port->state) {
1812 case SNK_NEGOTIATE_CAPABILITIES:
1813 port->pps_data.active = false;
1814 tcpm_set_state(port, SNK_TRANSITION_SINK, 0);
1815 break;
1816 case SNK_NEGOTIATE_PPS_CAPABILITIES:
1817 port->pps_data.active = true;
1818 port->supply_voltage = port->pps_data.out_volt;
1819 port->current_limit = port->pps_data.op_curr;
1820 tcpm_set_state(port, SNK_TRANSITION_SINK, 0);
1821 break;
1822 case SOFT_RESET_SEND:
1823 port->message_id = 0;
1824 port->rx_msgid = -1;
1825 if (port->pwr_role == TYPEC_SOURCE)
1826 next_state = SRC_SEND_CAPABILITIES;
1827 else
1828 next_state = SNK_WAIT_CAPABILITIES;
1829 tcpm_set_state(port, next_state, 0);
1830 break;
1831 case DR_SWAP_SEND:
1832 tcpm_set_state(port, DR_SWAP_CHANGE_DR, 0);
1833 break;
1834 case PR_SWAP_SEND:
1835 tcpm_set_state(port, PR_SWAP_START, 0);
1836 break;
1837 case VCONN_SWAP_SEND:
1838 tcpm_set_state(port, VCONN_SWAP_START, 0);
1839 break;
1840 default:
1841 break;
1842 }
1843 break;
1844 case PD_CTRL_SOFT_RESET:
1845 tcpm_set_state(port, SOFT_RESET, 0);
1846 break;
1847 case PD_CTRL_DR_SWAP:
1848 if (port->typec_caps.data != TYPEC_PORT_DRD) {
1849 tcpm_queue_message(port, PD_MSG_CTRL_REJECT);
1850 break;
1851 }
1852 /*
1853 * XXX
1854 * 6.3.9: If an alternate mode is active, a request to swap
1855 * alternate modes shall trigger a port reset.
1856 */
1857 switch (port->state) {
1858 case SRC_READY:
1859 case SNK_READY:
1860 tcpm_set_state(port, DR_SWAP_ACCEPT, 0);
1861 break;
1862 default:
1863 tcpm_queue_message(port, PD_MSG_CTRL_WAIT);
1864 break;
1865 }
1866 break;
1867 case PD_CTRL_PR_SWAP:
1868 if (port->port_type != TYPEC_PORT_DRP) {
1869 tcpm_queue_message(port, PD_MSG_CTRL_REJECT);
1870 break;
1871 }
1872 switch (port->state) {
1873 case SRC_READY:
1874 case SNK_READY:
1875 tcpm_set_state(port, PR_SWAP_ACCEPT, 0);
1876 break;
1877 default:
1878 tcpm_queue_message(port, PD_MSG_CTRL_WAIT);
1879 break;
1880 }
1881 break;
1882 case PD_CTRL_VCONN_SWAP:
1883 switch (port->state) {
1884 case SRC_READY:
1885 case SNK_READY:
1886 tcpm_set_state(port, VCONN_SWAP_ACCEPT, 0);
1887 break;
1888 default:
1889 tcpm_queue_message(port, PD_MSG_CTRL_WAIT);
1890 break;
1891 }
1892 break;
1893 case PD_CTRL_GET_SOURCE_CAP_EXT:
1894 case PD_CTRL_GET_STATUS:
1895 case PD_CTRL_FR_SWAP:
1896 case PD_CTRL_GET_PPS_STATUS:
1897 case PD_CTRL_GET_COUNTRY_CODES:
1898 /* Currently not supported */
1899 tcpm_queue_message(port, PD_MSG_CTRL_NOT_SUPP);
1900 break;
1901 default:
1902 tcpm_log(port, "Unhandled ctrl message type %#x", type);
1903 break;
1904 }
1905 }
1906
1907 static void tcpm_pd_ext_msg_request(struct tcpm_port *port,
1908 const struct pd_message *msg)
1909 {
1910 enum pd_ext_msg_type type = pd_header_type_le(msg->header);
1911 unsigned int data_size = pd_ext_header_data_size_le(msg->ext_msg.header);
1912
1913 if (!(msg->ext_msg.header & PD_EXT_HDR_CHUNKED)) {
1914 tcpm_log(port, "Unchunked extended messages unsupported");
1915 return;
1916 }
1917
1918 if (data_size > PD_EXT_MAX_CHUNK_DATA) {
1919 tcpm_log(port, "Chunk handling not yet supported");
1920 return;
1921 }
1922
1923 switch (type) {
1924 case PD_EXT_STATUS:
1925 /*
1926 * If PPS related events raised then get PPS status to clear
1927 * (see USB PD 3.0 Spec, 6.5.2.4)
1928 */
1929 if (msg->ext_msg.data[USB_PD_EXT_SDB_EVENT_FLAGS] &
1930 USB_PD_EXT_SDB_PPS_EVENTS)
1931 tcpm_set_state(port, GET_PPS_STATUS_SEND, 0);
1932 else
1933 tcpm_set_state(port, ready_state(port), 0);
1934 break;
1935 case PD_EXT_PPS_STATUS:
1936 /*
1937 * For now the PPS status message is used to clear events
1938 * and nothing more.
1939 */
1940 tcpm_set_state(port, ready_state(port), 0);
1941 break;
1942 case PD_EXT_SOURCE_CAP_EXT:
1943 case PD_EXT_GET_BATT_CAP:
1944 case PD_EXT_GET_BATT_STATUS:
1945 case PD_EXT_BATT_CAP:
1946 case PD_EXT_GET_MANUFACTURER_INFO:
1947 case PD_EXT_MANUFACTURER_INFO:
1948 case PD_EXT_SECURITY_REQUEST:
1949 case PD_EXT_SECURITY_RESPONSE:
1950 case PD_EXT_FW_UPDATE_REQUEST:
1951 case PD_EXT_FW_UPDATE_RESPONSE:
1952 case PD_EXT_COUNTRY_INFO:
1953 case PD_EXT_COUNTRY_CODES:
1954 tcpm_queue_message(port, PD_MSG_CTRL_NOT_SUPP);
1955 break;
1956 default:
1957 tcpm_log(port, "Unhandled extended message type %#x", type);
1958 break;
1959 }
1960 }
1961
1962 static void tcpm_pd_rx_handler(struct work_struct *work)
1963 {
1964 struct pd_rx_event *event = container_of(work,
1965 struct pd_rx_event, work);
1966 const struct pd_message *msg = &event->msg;
1967 unsigned int cnt = pd_header_cnt_le(msg->header);
1968 struct tcpm_port *port = event->port;
1969
1970 mutex_lock(&port->lock);
1971
1972 tcpm_log(port, "PD RX, header: %#x [%d]", le16_to_cpu(msg->header),
1973 port->attached);
1974
1975 if (port->attached) {
1976 enum pd_ctrl_msg_type type = pd_header_type_le(msg->header);
1977 unsigned int msgid = pd_header_msgid_le(msg->header);
1978
1979 /*
1980 * USB PD standard, 6.6.1.2:
1981 * "... if MessageID value in a received Message is the
1982 * same as the stored value, the receiver shall return a
1983 * GoodCRC Message with that MessageID value and drop
1984 * the Message (this is a retry of an already received
1985 * Message). Note: this shall not apply to the Soft_Reset
1986 * Message which always has a MessageID value of zero."
1987 */
1988 if (msgid == port->rx_msgid && type != PD_CTRL_SOFT_RESET)
1989 goto done;
1990 port->rx_msgid = msgid;
1991
1992 /*
1993 * If both ends believe to be DFP/host, we have a data role
1994 * mismatch.
1995 */
1996 if (!!(le16_to_cpu(msg->header) & PD_HEADER_DATA_ROLE) ==
1997 (port->data_role == TYPEC_HOST)) {
1998 tcpm_log(port,
1999 "Data role mismatch, initiating error recovery");
2000 tcpm_set_state(port, ERROR_RECOVERY, 0);
2001 } else {
2002 if (msg->header & PD_HEADER_EXT_HDR)
2003 tcpm_pd_ext_msg_request(port, msg);
2004 else if (cnt)
2005 tcpm_pd_data_request(port, msg);
2006 else
2007 tcpm_pd_ctrl_request(port, msg);
2008 }
2009 }
2010
2011 done:
2012 mutex_unlock(&port->lock);
2013 kfree(event);
2014 }
2015
2016 void tcpm_pd_receive(struct tcpm_port *port, const struct pd_message *msg)
2017 {
2018 struct pd_rx_event *event;
2019
2020 event = kzalloc(sizeof(*event), GFP_ATOMIC);
2021 if (!event)
2022 return;
2023
2024 INIT_WORK(&event->work, tcpm_pd_rx_handler);
2025 event->port = port;
2026 memcpy(&event->msg, msg, sizeof(*msg));
2027 queue_work(port->wq, &event->work);
2028 }
2029 EXPORT_SYMBOL_GPL(tcpm_pd_receive);
2030
2031 static int tcpm_pd_send_control(struct tcpm_port *port,
2032 enum pd_ctrl_msg_type type)
2033 {
2034 struct pd_message msg;
2035
2036 memset(&msg, 0, sizeof(msg));
2037 msg.header = PD_HEADER_LE(type, port->pwr_role,
2038 port->data_role,
2039 port->negotiated_rev,
2040 port->message_id, 0);
2041
2042 return tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
2043 }
2044
2045 /*
2046 * Send queued message without affecting state.
2047 * Return true if state machine should go back to sleep,
2048 * false otherwise.
2049 */
2050 static bool tcpm_send_queued_message(struct tcpm_port *port)
2051 {
2052 enum pd_msg_request queued_message;
2053
2054 do {
2055 queued_message = port->queued_message;
2056 port->queued_message = PD_MSG_NONE;
2057
2058 switch (queued_message) {
2059 case PD_MSG_CTRL_WAIT:
2060 tcpm_pd_send_control(port, PD_CTRL_WAIT);
2061 break;
2062 case PD_MSG_CTRL_REJECT:
2063 tcpm_pd_send_control(port, PD_CTRL_REJECT);
2064 break;
2065 case PD_MSG_CTRL_NOT_SUPP:
2066 tcpm_pd_send_control(port, PD_CTRL_NOT_SUPP);
2067 break;
2068 case PD_MSG_DATA_SINK_CAP:
2069 tcpm_pd_send_sink_caps(port);
2070 break;
2071 case PD_MSG_DATA_SOURCE_CAP:
2072 tcpm_pd_send_source_caps(port);
2073 break;
2074 default:
2075 break;
2076 }
2077 } while (port->queued_message != PD_MSG_NONE);
2078
2079 if (port->delayed_state != INVALID_STATE) {
2080 if (time_is_after_jiffies(port->delayed_runtime)) {
2081 mod_delayed_work(port->wq, &port->state_machine,
2082 port->delayed_runtime - jiffies);
2083 return true;
2084 }
2085 port->delayed_state = INVALID_STATE;
2086 }
2087 return false;
2088 }
2089
2090 static int tcpm_pd_check_request(struct tcpm_port *port)
2091 {
2092 u32 pdo, rdo = port->sink_request;
2093 unsigned int max, op, pdo_max, index;
2094 enum pd_pdo_type type;
2095
2096 index = rdo_index(rdo);
2097 if (!index || index > port->nr_src_pdo)
2098 return -EINVAL;
2099
2100 pdo = port->src_pdo[index - 1];
2101 type = pdo_type(pdo);
2102 switch (type) {
2103 case PDO_TYPE_FIXED:
2104 case PDO_TYPE_VAR:
2105 max = rdo_max_current(rdo);
2106 op = rdo_op_current(rdo);
2107 pdo_max = pdo_max_current(pdo);
2108
2109 if (op > pdo_max)
2110 return -EINVAL;
2111 if (max > pdo_max && !(rdo & RDO_CAP_MISMATCH))
2112 return -EINVAL;
2113
2114 if (type == PDO_TYPE_FIXED)
2115 tcpm_log(port,
2116 "Requested %u mV, %u mA for %u / %u mA",
2117 pdo_fixed_voltage(pdo), pdo_max, op, max);
2118 else
2119 tcpm_log(port,
2120 "Requested %u -> %u mV, %u mA for %u / %u mA",
2121 pdo_min_voltage(pdo), pdo_max_voltage(pdo),
2122 pdo_max, op, max);
2123 break;
2124 case PDO_TYPE_BATT:
2125 max = rdo_max_power(rdo);
2126 op = rdo_op_power(rdo);
2127 pdo_max = pdo_max_power(pdo);
2128
2129 if (op > pdo_max)
2130 return -EINVAL;
2131 if (max > pdo_max && !(rdo & RDO_CAP_MISMATCH))
2132 return -EINVAL;
2133 tcpm_log(port,
2134 "Requested %u -> %u mV, %u mW for %u / %u mW",
2135 pdo_min_voltage(pdo), pdo_max_voltage(pdo),
2136 pdo_max, op, max);
2137 break;
2138 default:
2139 return -EINVAL;
2140 }
2141
2142 port->op_vsafe5v = index == 1;
2143
2144 return 0;
2145 }
2146
2147 #define min_power(x, y) min(pdo_max_power(x), pdo_max_power(y))
2148 #define min_current(x, y) min(pdo_max_current(x), pdo_max_current(y))
2149
2150 static int tcpm_pd_select_pdo(struct tcpm_port *port, int *sink_pdo,
2151 int *src_pdo)
2152 {
2153 unsigned int i, j, max_src_mv = 0, min_src_mv = 0, max_mw = 0,
2154 max_mv = 0, src_mw = 0, src_ma = 0, max_snk_mv = 0,
2155 min_snk_mv = 0;
2156 int ret = -EINVAL;
2157
2158 port->pps_data.supported = false;
2159 port->usb_type = POWER_SUPPLY_USB_TYPE_PD;
2160
2161 /*
2162 * Select the source PDO providing the most power which has a
2163 * matchig sink cap.
2164 */
2165 for (i = 0; i < port->nr_source_caps; i++) {
2166 u32 pdo = port->source_caps[i];
2167 enum pd_pdo_type type = pdo_type(pdo);
2168
2169 switch (type) {
2170 case PDO_TYPE_FIXED:
2171 max_src_mv = pdo_fixed_voltage(pdo);
2172 min_src_mv = max_src_mv;
2173 break;
2174 case PDO_TYPE_BATT:
2175 case PDO_TYPE_VAR:
2176 max_src_mv = pdo_max_voltage(pdo);
2177 min_src_mv = pdo_min_voltage(pdo);
2178 break;
2179 case PDO_TYPE_APDO:
2180 if (pdo_apdo_type(pdo) == APDO_TYPE_PPS) {
2181 port->pps_data.supported = true;
2182 port->usb_type =
2183 POWER_SUPPLY_USB_TYPE_PD_PPS;
2184 }
2185 continue;
2186 default:
2187 tcpm_log(port, "Invalid source PDO type, ignoring");
2188 continue;
2189 }
2190
2191 switch (type) {
2192 case PDO_TYPE_FIXED:
2193 case PDO_TYPE_VAR:
2194 src_ma = pdo_max_current(pdo);
2195 src_mw = src_ma * min_src_mv / 1000;
2196 break;
2197 case PDO_TYPE_BATT:
2198 src_mw = pdo_max_power(pdo);
2199 break;
2200 case PDO_TYPE_APDO:
2201 continue;
2202 default:
2203 tcpm_log(port, "Invalid source PDO type, ignoring");
2204 continue;
2205 }
2206
2207 for (j = 0; j < port->nr_snk_pdo; j++) {
2208 pdo = port->snk_pdo[j];
2209
2210 switch (pdo_type(pdo)) {
2211 case PDO_TYPE_FIXED:
2212 max_snk_mv = pdo_fixed_voltage(pdo);
2213 min_snk_mv = max_snk_mv;
2214 break;
2215 case PDO_TYPE_BATT:
2216 case PDO_TYPE_VAR:
2217 max_snk_mv = pdo_max_voltage(pdo);
2218 min_snk_mv = pdo_min_voltage(pdo);
2219 break;
2220 case PDO_TYPE_APDO:
2221 continue;
2222 default:
2223 tcpm_log(port, "Invalid sink PDO type, ignoring");
2224 continue;
2225 }
2226
2227 if (max_src_mv <= max_snk_mv &&
2228 min_src_mv >= min_snk_mv) {
2229 /* Prefer higher voltages if available */
2230 if ((src_mw == max_mw && min_src_mv > max_mv) ||
2231 src_mw > max_mw) {
2232 *src_pdo = i;
2233 *sink_pdo = j;
2234 max_mw = src_mw;
2235 max_mv = min_src_mv;
2236 ret = 0;
2237 }
2238 }
2239 }
2240 }
2241
2242 return ret;
2243 }
2244
2245 #define min_pps_apdo_current(x, y) \
2246 min(pdo_pps_apdo_max_current(x), pdo_pps_apdo_max_current(y))
2247
2248 static unsigned int tcpm_pd_select_pps_apdo(struct tcpm_port *port)
2249 {
2250 unsigned int i, j, max_mw = 0, max_mv = 0;
2251 unsigned int min_src_mv, max_src_mv, src_ma, src_mw;
2252 unsigned int min_snk_mv, max_snk_mv;
2253 unsigned int max_op_mv;
2254 u32 pdo, src, snk;
2255 unsigned int src_pdo = 0, snk_pdo = 0;
2256
2257 /*
2258 * Select the source PPS APDO providing the most power while staying
2259 * within the board's limits. We skip the first PDO as this is always
2260 * 5V 3A.
2261 */
2262 for (i = 1; i < port->nr_source_caps; ++i) {
2263 pdo = port->source_caps[i];
2264
2265 switch (pdo_type(pdo)) {
2266 case PDO_TYPE_APDO:
2267 if (pdo_apdo_type(pdo) != APDO_TYPE_PPS) {
2268 tcpm_log(port, "Not PPS APDO (source), ignoring");
2269 continue;
2270 }
2271
2272 min_src_mv = pdo_pps_apdo_min_voltage(pdo);
2273 max_src_mv = pdo_pps_apdo_max_voltage(pdo);
2274 src_ma = pdo_pps_apdo_max_current(pdo);
2275 src_mw = (src_ma * max_src_mv) / 1000;
2276
2277 /*
2278 * Now search through the sink PDOs to find a matching
2279 * PPS APDO. Again skip the first sink PDO as this will
2280 * always be 5V 3A.
2281 */
2282 for (j = 1; j < port->nr_snk_pdo; j++) {
2283 pdo = port->snk_pdo[j];
2284
2285 switch (pdo_type(pdo)) {
2286 case PDO_TYPE_APDO:
2287 if (pdo_apdo_type(pdo) != APDO_TYPE_PPS) {
2288 tcpm_log(port,
2289 "Not PPS APDO (sink), ignoring");
2290 continue;
2291 }
2292
2293 min_snk_mv =
2294 pdo_pps_apdo_min_voltage(pdo);
2295 max_snk_mv =
2296 pdo_pps_apdo_max_voltage(pdo);
2297 break;
2298 default:
2299 tcpm_log(port,
2300 "Not APDO type (sink), ignoring");
2301 continue;
2302 }
2303
2304 if (min_src_mv <= max_snk_mv &&
2305 max_src_mv >= min_snk_mv) {
2306 max_op_mv = min(max_src_mv, max_snk_mv);
2307 src_mw = (max_op_mv * src_ma) / 1000;
2308 /* Prefer higher voltages if available */
2309 if ((src_mw == max_mw &&
2310 max_op_mv > max_mv) ||
2311 src_mw > max_mw) {
2312 src_pdo = i;
2313 snk_pdo = j;
2314 max_mw = src_mw;
2315 max_mv = max_op_mv;
2316 }
2317 }
2318 }
2319
2320 break;
2321 default:
2322 tcpm_log(port, "Not APDO type (source), ignoring");
2323 continue;
2324 }
2325 }
2326
2327 if (src_pdo) {
2328 src = port->source_caps[src_pdo];
2329 snk = port->snk_pdo[snk_pdo];
2330
2331 port->pps_data.min_volt = max(pdo_pps_apdo_min_voltage(src),
2332 pdo_pps_apdo_min_voltage(snk));
2333 port->pps_data.max_volt = min(pdo_pps_apdo_max_voltage(src),
2334 pdo_pps_apdo_max_voltage(snk));
2335 port->pps_data.max_curr = min_pps_apdo_current(src, snk);
2336 port->pps_data.out_volt = min(port->pps_data.max_volt,
2337 max(port->pps_data.min_volt,
2338 port->pps_data.out_volt));
2339 port->pps_data.op_curr = min(port->pps_data.max_curr,
2340 port->pps_data.op_curr);
2341 }
2342
2343 return src_pdo;
2344 }
2345
2346 static int tcpm_pd_build_request(struct tcpm_port *port, u32 *rdo)
2347 {
2348 unsigned int mv, ma, mw, flags;
2349 unsigned int max_ma, max_mw;
2350 enum pd_pdo_type type;
2351 u32 pdo, matching_snk_pdo;
2352 int src_pdo_index = 0;
2353 int snk_pdo_index = 0;
2354 int ret;
2355
2356 ret = tcpm_pd_select_pdo(port, &snk_pdo_index, &src_pdo_index);
2357 if (ret < 0)
2358 return ret;
2359
2360 pdo = port->source_caps[src_pdo_index];
2361 matching_snk_pdo = port->snk_pdo[snk_pdo_index];
2362 type = pdo_type(pdo);
2363
2364 switch (type) {
2365 case PDO_TYPE_FIXED:
2366 mv = pdo_fixed_voltage(pdo);
2367 break;
2368 case PDO_TYPE_BATT:
2369 case PDO_TYPE_VAR:
2370 mv = pdo_min_voltage(pdo);
2371 break;
2372 default:
2373 tcpm_log(port, "Invalid PDO selected!");
2374 return -EINVAL;
2375 }
2376
2377 /* Select maximum available current within the sink pdo's limit */
2378 if (type == PDO_TYPE_BATT) {
2379 mw = min_power(pdo, matching_snk_pdo);
2380 ma = 1000 * mw / mv;
2381 } else {
2382 ma = min_current(pdo, matching_snk_pdo);
2383 mw = ma * mv / 1000;
2384 }
2385
2386 flags = RDO_USB_COMM | RDO_NO_SUSPEND;
2387
2388 /* Set mismatch bit if offered power is less than operating power */
2389 max_ma = ma;
2390 max_mw = mw;
2391 if (mw < port->operating_snk_mw) {
2392 flags |= RDO_CAP_MISMATCH;
2393 if (type == PDO_TYPE_BATT &&
2394 (pdo_max_power(matching_snk_pdo) > pdo_max_power(pdo)))
2395 max_mw = pdo_max_power(matching_snk_pdo);
2396 else if (pdo_max_current(matching_snk_pdo) >
2397 pdo_max_current(pdo))
2398 max_ma = pdo_max_current(matching_snk_pdo);
2399 }
2400
2401 tcpm_log(port, "cc=%d cc1=%d cc2=%d vbus=%d vconn=%s polarity=%d",
2402 port->cc_req, port->cc1, port->cc2, port->vbus_source,
2403 port->vconn_role == TYPEC_SOURCE ? "source" : "sink",
2404 port->polarity);
2405
2406 if (type == PDO_TYPE_BATT) {
2407 *rdo = RDO_BATT(src_pdo_index + 1, mw, max_mw, flags);
2408
2409 tcpm_log(port, "Requesting PDO %d: %u mV, %u mW%s",
2410 src_pdo_index, mv, mw,
2411 flags & RDO_CAP_MISMATCH ? " [mismatch]" : "");
2412 } else {
2413 *rdo = RDO_FIXED(src_pdo_index + 1, ma, max_ma, flags);
2414
2415 tcpm_log(port, "Requesting PDO %d: %u mV, %u mA%s",
2416 src_pdo_index, mv, ma,
2417 flags & RDO_CAP_MISMATCH ? " [mismatch]" : "");
2418 }
2419
2420 port->current_limit = ma;
2421 port->supply_voltage = mv;
2422
2423 return 0;
2424 }
2425
2426 static int tcpm_pd_send_request(struct tcpm_port *port)
2427 {
2428 struct pd_message msg;
2429 int ret;
2430 u32 rdo;
2431
2432 ret = tcpm_pd_build_request(port, &rdo);
2433 if (ret < 0)
2434 return ret;
2435
2436 memset(&msg, 0, sizeof(msg));
2437 msg.header = PD_HEADER_LE(PD_DATA_REQUEST,
2438 port->pwr_role,
2439 port->data_role,
2440 port->negotiated_rev,
2441 port->message_id, 1);
2442 msg.payload[0] = cpu_to_le32(rdo);
2443
2444 return tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
2445 }
2446
2447 static int tcpm_pd_build_pps_request(struct tcpm_port *port, u32 *rdo)
2448 {
2449 unsigned int out_mv, op_ma, op_mw, max_mv, max_ma, flags;
2450 enum pd_pdo_type type;
2451 unsigned int src_pdo_index;
2452 u32 pdo;
2453
2454 src_pdo_index = tcpm_pd_select_pps_apdo(port);
2455 if (!src_pdo_index)
2456 return -EOPNOTSUPP;
2457
2458 pdo = port->source_caps[src_pdo_index];
2459 type = pdo_type(pdo);
2460
2461 switch (type) {
2462 case PDO_TYPE_APDO:
2463 if (pdo_apdo_type(pdo) != APDO_TYPE_PPS) {
2464 tcpm_log(port, "Invalid APDO selected!");
2465 return -EINVAL;
2466 }
2467 max_mv = port->pps_data.max_volt;
2468 max_ma = port->pps_data.max_curr;
2469 out_mv = port->pps_data.out_volt;
2470 op_ma = port->pps_data.op_curr;
2471 break;
2472 default:
2473 tcpm_log(port, "Invalid PDO selected!");
2474 return -EINVAL;
2475 }
2476
2477 flags = RDO_USB_COMM | RDO_NO_SUSPEND;
2478
2479 op_mw = (op_ma * out_mv) / 1000;
2480 if (op_mw < port->operating_snk_mw) {
2481 /*
2482 * Try raising current to meet power needs. If that's not enough
2483 * then try upping the voltage. If that's still not enough
2484 * then we've obviously chosen a PPS APDO which really isn't
2485 * suitable so abandon ship.
2486 */
2487 op_ma = (port->operating_snk_mw * 1000) / out_mv;
2488 if ((port->operating_snk_mw * 1000) % out_mv)
2489 ++op_ma;
2490 op_ma += RDO_PROG_CURR_MA_STEP - (op_ma % RDO_PROG_CURR_MA_STEP);
2491
2492 if (op_ma > max_ma) {
2493 op_ma = max_ma;
2494 out_mv = (port->operating_snk_mw * 1000) / op_ma;
2495 if ((port->operating_snk_mw * 1000) % op_ma)
2496 ++out_mv;
2497 out_mv += RDO_PROG_VOLT_MV_STEP -
2498 (out_mv % RDO_PROG_VOLT_MV_STEP);
2499
2500 if (out_mv > max_mv) {
2501 tcpm_log(port, "Invalid PPS APDO selected!");
2502 return -EINVAL;
2503 }
2504 }
2505 }
2506
2507 tcpm_log(port, "cc=%d cc1=%d cc2=%d vbus=%d vconn=%s polarity=%d",
2508 port->cc_req, port->cc1, port->cc2, port->vbus_source,
2509 port->vconn_role == TYPEC_SOURCE ? "source" : "sink",
2510 port->polarity);
2511
2512 *rdo = RDO_PROG(src_pdo_index + 1, out_mv, op_ma, flags);
2513
2514 tcpm_log(port, "Requesting APDO %d: %u mV, %u mA",
2515 src_pdo_index, out_mv, op_ma);
2516
2517 port->pps_data.op_curr = op_ma;
2518 port->pps_data.out_volt = out_mv;
2519
2520 return 0;
2521 }
2522
2523 static int tcpm_pd_send_pps_request(struct tcpm_port *port)
2524 {
2525 struct pd_message msg;
2526 int ret;
2527 u32 rdo;
2528
2529 ret = tcpm_pd_build_pps_request(port, &rdo);
2530 if (ret < 0)
2531 return ret;
2532
2533 memset(&msg, 0, sizeof(msg));
2534 msg.header = PD_HEADER_LE(PD_DATA_REQUEST,
2535 port->pwr_role,
2536 port->data_role,
2537 port->negotiated_rev,
2538 port->message_id, 1);
2539 msg.payload[0] = cpu_to_le32(rdo);
2540
2541 return tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
2542 }
2543
2544 static int tcpm_set_vbus(struct tcpm_port *port, bool enable)
2545 {
2546 int ret;
2547
2548 if (enable && port->vbus_charge)
2549 return -EINVAL;
2550
2551 tcpm_log(port, "vbus:=%d charge=%d", enable, port->vbus_charge);
2552
2553 ret = port->tcpc->set_vbus(port->tcpc, enable, port->vbus_charge);
2554 if (ret < 0)
2555 return ret;
2556
2557 port->vbus_source = enable;
2558 return 0;
2559 }
2560
2561 static int tcpm_set_charge(struct tcpm_port *port, bool charge)
2562 {
2563 int ret;
2564
2565 if (charge && port->vbus_source)
2566 return -EINVAL;
2567
2568 if (charge != port->vbus_charge) {
2569 tcpm_log(port, "vbus=%d charge:=%d", port->vbus_source, charge);
2570 ret = port->tcpc->set_vbus(port->tcpc, port->vbus_source,
2571 charge);
2572 if (ret < 0)
2573 return ret;
2574 }
2575 port->vbus_charge = charge;
2576 return 0;
2577 }
2578
2579 static bool tcpm_start_toggling(struct tcpm_port *port, enum typec_cc_status cc)
2580 {
2581 int ret;
2582
2583 if (!port->tcpc->start_toggling)
2584 return false;
2585
2586 tcpm_log_force(port, "Start toggling");
2587 ret = port->tcpc->start_toggling(port->tcpc, port->port_type, cc);
2588 return ret == 0;
2589 }
2590
2591 static void tcpm_set_cc(struct tcpm_port *port, enum typec_cc_status cc)
2592 {
2593 tcpm_log(port, "cc:=%d", cc);
2594 port->cc_req = cc;
2595 port->tcpc->set_cc(port->tcpc, cc);
2596 }
2597
2598 static int tcpm_init_vbus(struct tcpm_port *port)
2599 {
2600 int ret;
2601
2602 ret = port->tcpc->set_vbus(port->tcpc, false, false);
2603 port->vbus_source = false;
2604 port->vbus_charge = false;
2605 return ret;
2606 }
2607
2608 static int tcpm_init_vconn(struct tcpm_port *port)
2609 {
2610 int ret;
2611
2612 ret = port->tcpc->set_vconn(port->tcpc, false);
2613 port->vconn_role = TYPEC_SINK;
2614 return ret;
2615 }
2616
2617 static void tcpm_typec_connect(struct tcpm_port *port)
2618 {
2619 if (!port->connected) {
2620 /* Make sure we don't report stale identity information */
2621 memset(&port->partner_ident, 0, sizeof(port->partner_ident));
2622 port->partner_desc.usb_pd = port->pd_capable;
2623 if (tcpm_port_is_debug(port))
2624 port->partner_desc.accessory = TYPEC_ACCESSORY_DEBUG;
2625 else if (tcpm_port_is_audio(port))
2626 port->partner_desc.accessory = TYPEC_ACCESSORY_AUDIO;
2627 else
2628 port->partner_desc.accessory = TYPEC_ACCESSORY_NONE;
2629 port->partner = typec_register_partner(port->typec_port,
2630 &port->partner_desc);
2631 port->connected = true;
2632 }
2633 }
2634
2635 static int tcpm_src_attach(struct tcpm_port *port)
2636 {
2637 enum typec_cc_polarity polarity =
2638 port->cc2 == TYPEC_CC_RD ? TYPEC_POLARITY_CC2
2639 : TYPEC_POLARITY_CC1;
2640 int ret;
2641
2642 if (port->attached)
2643 return 0;
2644
2645 ret = tcpm_set_polarity(port, polarity);
2646 if (ret < 0)
2647 return ret;
2648
2649 ret = tcpm_set_roles(port, true, TYPEC_SOURCE,
2650 tcpm_data_role_for_source(port));
2651 if (ret < 0)
2652 return ret;
2653
2654 ret = port->tcpc->set_pd_rx(port->tcpc, true);
2655 if (ret < 0)
2656 goto out_disable_mux;
2657
2658 /*
2659 * USB Type-C specification, version 1.2,
2660 * chapter 4.5.2.2.8.1 (Attached.SRC Requirements)
2661 * Enable VCONN only if the non-RD port is set to RA.
2662 */
2663 if ((polarity == TYPEC_POLARITY_CC1 && port->cc2 == TYPEC_CC_RA) ||
2664 (polarity == TYPEC_POLARITY_CC2 && port->cc1 == TYPEC_CC_RA)) {
2665 ret = tcpm_set_vconn(port, true);
2666 if (ret < 0)
2667 goto out_disable_pd;
2668 }
2669
2670 ret = tcpm_set_vbus(port, true);
2671 if (ret < 0)
2672 goto out_disable_vconn;
2673
2674 port->pd_capable = false;
2675
2676 port->partner = NULL;
2677
2678 port->attached = true;
2679 port->send_discover = true;
2680
2681 return 0;
2682
2683 out_disable_vconn:
2684 tcpm_set_vconn(port, false);
2685 out_disable_pd:
2686 port->tcpc->set_pd_rx(port->tcpc, false);
2687 out_disable_mux:
2688 tcpm_mux_set(port, TYPEC_STATE_SAFE, USB_ROLE_NONE,
2689 TYPEC_ORIENTATION_NONE);
2690 return ret;
2691 }
2692
2693 static void tcpm_typec_disconnect(struct tcpm_port *port)
2694 {
2695 if (port->connected) {
2696 typec_unregister_partner(port->partner);
2697 port->partner = NULL;
2698 port->connected = false;
2699 }
2700 }
2701
2702 static void tcpm_unregister_altmodes(struct tcpm_port *port)
2703 {
2704 struct pd_mode_data *modep = &port->mode_data;
2705 int i;
2706
2707 for (i = 0; i < modep->altmodes; i++) {
2708 typec_unregister_altmode(port->partner_altmode[i]);
2709 port->partner_altmode[i] = NULL;
2710 }
2711
2712 memset(modep, 0, sizeof(*modep));
2713 }
2714
2715 static void tcpm_reset_port(struct tcpm_port *port)
2716 {
2717 tcpm_unregister_altmodes(port);
2718 tcpm_typec_disconnect(port);
2719 port->attached = false;
2720 port->pd_capable = false;
2721 port->pps_data.supported = false;
2722
2723 /*
2724 * First Rx ID should be 0; set this to a sentinel of -1 so that
2725 * we can check tcpm_pd_rx_handler() if we had seen it before.
2726 */
2727 port->rx_msgid = -1;
2728
2729 port->tcpc->set_pd_rx(port->tcpc, false);
2730 tcpm_init_vbus(port); /* also disables charging */
2731 tcpm_init_vconn(port);
2732 tcpm_set_current_limit(port, 0, 0);
2733 tcpm_set_polarity(port, TYPEC_POLARITY_CC1);
2734 tcpm_mux_set(port, TYPEC_STATE_SAFE, USB_ROLE_NONE,
2735 TYPEC_ORIENTATION_NONE);
2736 tcpm_set_attached_state(port, false);
2737 port->try_src_count = 0;
2738 port->try_snk_count = 0;
2739 port->usb_type = POWER_SUPPLY_USB_TYPE_C;
2740
2741 power_supply_changed(port->psy);
2742 }
2743
2744 static void tcpm_detach(struct tcpm_port *port)
2745 {
2746 if (!port->attached)
2747 return;
2748
2749 if (tcpm_port_is_disconnected(port))
2750 port->hard_reset_count = 0;
2751
2752 tcpm_reset_port(port);
2753 }
2754
2755 static void tcpm_src_detach(struct tcpm_port *port)
2756 {
2757 tcpm_detach(port);
2758 }
2759
2760 static int tcpm_snk_attach(struct tcpm_port *port)
2761 {
2762 int ret;
2763
2764 if (port->attached)
2765 return 0;
2766
2767 ret = tcpm_set_polarity(port, port->cc2 != TYPEC_CC_OPEN ?
2768 TYPEC_POLARITY_CC2 : TYPEC_POLARITY_CC1);
2769 if (ret < 0)
2770 return ret;
2771
2772 ret = tcpm_set_roles(port, true, TYPEC_SINK,
2773 tcpm_data_role_for_sink(port));
2774 if (ret < 0)
2775 return ret;
2776
2777 port->pd_capable = false;
2778
2779 port->partner = NULL;
2780
2781 port->attached = true;
2782 port->send_discover = true;
2783
2784 return 0;
2785 }
2786
2787 static void tcpm_snk_detach(struct tcpm_port *port)
2788 {
2789 tcpm_detach(port);
2790 }
2791
2792 static int tcpm_acc_attach(struct tcpm_port *port)
2793 {
2794 int ret;
2795
2796 if (port->attached)
2797 return 0;
2798
2799 ret = tcpm_set_roles(port, true, TYPEC_SOURCE,
2800 tcpm_data_role_for_source(port));
2801 if (ret < 0)
2802 return ret;
2803
2804 port->partner = NULL;
2805
2806 tcpm_typec_connect(port);
2807
2808 port->attached = true;
2809
2810 return 0;
2811 }
2812
2813 static void tcpm_acc_detach(struct tcpm_port *port)
2814 {
2815 tcpm_detach(port);
2816 }
2817
2818 static inline enum tcpm_state hard_reset_state(struct tcpm_port *port)
2819 {
2820 if (port->hard_reset_count < PD_N_HARD_RESET_COUNT)
2821 return HARD_RESET_SEND;
2822 if (port->pd_capable)
2823 return ERROR_RECOVERY;
2824 if (port->pwr_role == TYPEC_SOURCE)
2825 return SRC_UNATTACHED;
2826 if (port->state == SNK_WAIT_CAPABILITIES)
2827 return SNK_READY;
2828 return SNK_UNATTACHED;
2829 }
2830
2831 static inline enum tcpm_state unattached_state(struct tcpm_port *port)
2832 {
2833 if (port->port_type == TYPEC_PORT_DRP) {
2834 if (port->pwr_role == TYPEC_SOURCE)
2835 return SRC_UNATTACHED;
2836 else
2837 return SNK_UNATTACHED;
2838 } else if (port->port_type == TYPEC_PORT_SRC) {
2839 return SRC_UNATTACHED;
2840 }
2841
2842 return SNK_UNATTACHED;
2843 }
2844
2845 static void tcpm_check_send_discover(struct tcpm_port *port)
2846 {
2847 if (port->data_role == TYPEC_HOST && port->send_discover &&
2848 port->pd_capable) {
2849 tcpm_send_vdm(port, USB_SID_PD, CMD_DISCOVER_IDENT, NULL, 0);
2850 port->send_discover = false;
2851 }
2852 }
2853
2854 static void tcpm_swap_complete(struct tcpm_port *port, int result)
2855 {
2856 if (port->swap_pending) {
2857 port->swap_status = result;
2858 port->swap_pending = false;
2859 port->non_pd_role_swap = false;
2860 complete(&port->swap_complete);
2861 }
2862 }
2863
2864 static enum typec_pwr_opmode tcpm_get_pwr_opmode(enum typec_cc_status cc)
2865 {
2866 switch (cc) {
2867 case TYPEC_CC_RP_1_5:
2868 return TYPEC_PWR_MODE_1_5A;
2869 case TYPEC_CC_RP_3_0:
2870 return TYPEC_PWR_MODE_3_0A;
2871 case TYPEC_CC_RP_DEF:
2872 default:
2873 return TYPEC_PWR_MODE_USB;
2874 }
2875 }
2876
2877 static void run_state_machine(struct tcpm_port *port)
2878 {
2879 int ret;
2880 enum typec_pwr_opmode opmode;
2881 unsigned int msecs;
2882
2883 port->enter_state = port->state;
2884 switch (port->state) {
2885 case TOGGLING:
2886 break;
2887 /* SRC states */
2888 case SRC_UNATTACHED:
2889 if (!port->non_pd_role_swap)
2890 tcpm_swap_complete(port, -ENOTCONN);
2891 tcpm_src_detach(port);
2892 if (tcpm_start_toggling(port, tcpm_rp_cc(port))) {
2893 tcpm_set_state(port, TOGGLING, 0);
2894 break;
2895 }
2896 tcpm_set_cc(port, tcpm_rp_cc(port));
2897 if (port->port_type == TYPEC_PORT_DRP)
2898 tcpm_set_state(port, SNK_UNATTACHED, PD_T_DRP_SNK);
2899 break;
2900 case SRC_ATTACH_WAIT:
2901 if (tcpm_port_is_debug(port))
2902 tcpm_set_state(port, DEBUG_ACC_ATTACHED,
2903 PD_T_CC_DEBOUNCE);
2904 else if (tcpm_port_is_audio(port))
2905 tcpm_set_state(port, AUDIO_ACC_ATTACHED,
2906 PD_T_CC_DEBOUNCE);
2907 else if (tcpm_port_is_source(port))
2908 tcpm_set_state(port,
2909 tcpm_try_snk(port) ? SNK_TRY
2910 : SRC_ATTACHED,
2911 PD_T_CC_DEBOUNCE);
2912 break;
2913
2914 case SNK_TRY:
2915 port->try_snk_count++;
2916 /*
2917 * Requirements:
2918 * - Do not drive vconn or vbus
2919 * - Terminate CC pins (both) to Rd
2920 * Action:
2921 * - Wait for tDRPTry (PD_T_DRP_TRY).
2922 * Until then, ignore any state changes.
2923 */
2924 tcpm_set_cc(port, TYPEC_CC_RD);
2925 tcpm_set_state(port, SNK_TRY_WAIT, PD_T_DRP_TRY);
2926 break;
2927 case SNK_TRY_WAIT:
2928 if (tcpm_port_is_sink(port)) {
2929 tcpm_set_state(port, SNK_TRY_WAIT_DEBOUNCE, 0);
2930 } else {
2931 tcpm_set_state(port, SRC_TRYWAIT, 0);
2932 port->max_wait = 0;
2933 }
2934 break;
2935 case SNK_TRY_WAIT_DEBOUNCE:
2936 tcpm_set_state(port, SNK_TRY_WAIT_DEBOUNCE_CHECK_VBUS,
2937 PD_T_PD_DEBOUNCE);
2938 break;
2939 case SNK_TRY_WAIT_DEBOUNCE_CHECK_VBUS:
2940 if (port->vbus_present && tcpm_port_is_sink(port)) {
2941 tcpm_set_state(port, SNK_ATTACHED, 0);
2942 } else {
2943 tcpm_set_state(port, SRC_TRYWAIT, 0);
2944 port->max_wait = 0;
2945 }
2946 break;
2947 case SRC_TRYWAIT:
2948 tcpm_set_cc(port, tcpm_rp_cc(port));
2949 if (port->max_wait == 0) {
2950 port->max_wait = jiffies +
2951 msecs_to_jiffies(PD_T_DRP_TRY);
2952 tcpm_set_state(port, SRC_TRYWAIT_UNATTACHED,
2953 PD_T_DRP_TRY);
2954 } else {
2955 if (time_is_after_jiffies(port->max_wait))
2956 tcpm_set_state(port, SRC_TRYWAIT_UNATTACHED,
2957 jiffies_to_msecs(port->max_wait -
2958 jiffies));
2959 else
2960 tcpm_set_state(port, SNK_UNATTACHED, 0);
2961 }
2962 break;
2963 case SRC_TRYWAIT_DEBOUNCE:
2964 tcpm_set_state(port, SRC_ATTACHED, PD_T_CC_DEBOUNCE);
2965 break;
2966 case SRC_TRYWAIT_UNATTACHED:
2967 tcpm_set_state(port, SNK_UNATTACHED, 0);
2968 break;
2969
2970 case SRC_ATTACHED:
2971 ret = tcpm_src_attach(port);
2972 tcpm_set_state(port, SRC_UNATTACHED,
2973 ret < 0 ? 0 : PD_T_PS_SOURCE_ON);
2974 break;
2975 case SRC_STARTUP:
2976 opmode = tcpm_get_pwr_opmode(tcpm_rp_cc(port));
2977 typec_set_pwr_opmode(port->typec_port, opmode);
2978 port->pwr_opmode = TYPEC_PWR_MODE_USB;
2979 port->caps_count = 0;
2980 port->negotiated_rev = PD_MAX_REV;
2981 port->message_id = 0;
2982 port->rx_msgid = -1;
2983 port->explicit_contract = false;
2984 tcpm_set_state(port, SRC_SEND_CAPABILITIES, 0);
2985 break;
2986 case SRC_SEND_CAPABILITIES:
2987 port->caps_count++;
2988 if (port->caps_count > PD_N_CAPS_COUNT) {
2989 tcpm_set_state(port, SRC_READY, 0);
2990 break;
2991 }
2992 ret = tcpm_pd_send_source_caps(port);
2993 if (ret < 0) {
2994 tcpm_set_state(port, SRC_SEND_CAPABILITIES,
2995 PD_T_SEND_SOURCE_CAP);
2996 } else {
2997 /*
2998 * Per standard, we should clear the reset counter here.
2999 * However, that can result in state machine hang-ups.
3000 * Reset it only in READY state to improve stability.
3001 */
3002 /* port->hard_reset_count = 0; */
3003 port->caps_count = 0;
3004 port->pd_capable = true;
3005 tcpm_set_state_cond(port, SRC_SEND_CAPABILITIES_TIMEOUT,
3006 PD_T_SEND_SOURCE_CAP);
3007 }
3008 break;
3009 case SRC_SEND_CAPABILITIES_TIMEOUT:
3010 /*
3011 * Error recovery for a PD_DATA_SOURCE_CAP reply timeout.
3012 *
3013 * PD 2.0 sinks are supposed to accept src-capabilities with a
3014 * 3.0 header and simply ignore any src PDOs which the sink does
3015 * not understand such as PPS but some 2.0 sinks instead ignore
3016 * the entire PD_DATA_SOURCE_CAP message, causing contract
3017 * negotiation to fail.
3018 *
3019 * After PD_N_HARD_RESET_COUNT hard-reset attempts, we try
3020 * sending src-capabilities with a lower PD revision to
3021 * make these broken sinks work.
3022 */
3023 if (port->hard_reset_count < PD_N_HARD_RESET_COUNT) {
3024 tcpm_set_state(port, HARD_RESET_SEND, 0);
3025 } else if (port->negotiated_rev > PD_REV20) {
3026 port->negotiated_rev--;
3027 port->hard_reset_count = 0;
3028 tcpm_set_state(port, SRC_SEND_CAPABILITIES, 0);
3029 } else {
3030 tcpm_set_state(port, hard_reset_state(port), 0);
3031 }
3032 break;
3033 case SRC_NEGOTIATE_CAPABILITIES:
3034 ret = tcpm_pd_check_request(port);
3035 if (ret < 0) {
3036 tcpm_pd_send_control(port, PD_CTRL_REJECT);
3037 if (!port->explicit_contract) {
3038 tcpm_set_state(port,
3039 SRC_WAIT_NEW_CAPABILITIES, 0);
3040 } else {
3041 tcpm_set_state(port, SRC_READY, 0);
3042 }
3043 } else {
3044 tcpm_pd_send_control(port, PD_CTRL_ACCEPT);
3045 tcpm_set_state(port, SRC_TRANSITION_SUPPLY,
3046 PD_T_SRC_TRANSITION);
3047 }
3048 break;
3049 case SRC_TRANSITION_SUPPLY:
3050 /* XXX: regulator_set_voltage(vbus, ...) */
3051 tcpm_pd_send_control(port, PD_CTRL_PS_RDY);
3052 port->explicit_contract = true;
3053 typec_set_pwr_opmode(port->typec_port, TYPEC_PWR_MODE_PD);
3054 port->pwr_opmode = TYPEC_PWR_MODE_PD;
3055 tcpm_set_state_cond(port, SRC_READY, 0);
3056 break;
3057 case SRC_READY:
3058 #if 1
3059 port->hard_reset_count = 0;
3060 #endif
3061 port->try_src_count = 0;
3062
3063 tcpm_swap_complete(port, 0);
3064 tcpm_typec_connect(port);
3065
3066 tcpm_check_send_discover(port);
3067 /*
3068 * 6.3.5
3069 * Sending ping messages is not necessary if
3070 * - the source operates at vSafe5V
3071 * or
3072 * - The system is not operating in PD mode
3073 * or
3074 * - Both partners are connected using a Type-C connector
3075 *
3076 * There is no actual need to send PD messages since the local
3077 * port type-c and the spec does not clearly say whether PD is
3078 * possible when type-c is connected to Type-A/B
3079 */
3080 break;
3081 case SRC_WAIT_NEW_CAPABILITIES:
3082 /* Nothing to do... */
3083 break;
3084
3085 /* SNK states */
3086 case SNK_UNATTACHED:
3087 if (!port->non_pd_role_swap)
3088 tcpm_swap_complete(port, -ENOTCONN);
3089 tcpm_pps_complete(port, -ENOTCONN);
3090 tcpm_snk_detach(port);
3091 if (tcpm_start_toggling(port, TYPEC_CC_RD)) {
3092 tcpm_set_state(port, TOGGLING, 0);
3093 break;
3094 }
3095 tcpm_set_cc(port, TYPEC_CC_RD);
3096 if (port->port_type == TYPEC_PORT_DRP)
3097 tcpm_set_state(port, SRC_UNATTACHED, PD_T_DRP_SRC);
3098 break;
3099 case SNK_ATTACH_WAIT:
3100 if ((port->cc1 == TYPEC_CC_OPEN &&
3101 port->cc2 != TYPEC_CC_OPEN) ||
3102 (port->cc1 != TYPEC_CC_OPEN &&
3103 port->cc2 == TYPEC_CC_OPEN))
3104 tcpm_set_state(port, SNK_DEBOUNCED,
3105 PD_T_CC_DEBOUNCE);
3106 else if (tcpm_port_is_disconnected(port))
3107 tcpm_set_state(port, SNK_UNATTACHED,
3108 PD_T_PD_DEBOUNCE);
3109 break;
3110 case SNK_DEBOUNCED:
3111 if (tcpm_port_is_disconnected(port))
3112 tcpm_set_state(port, SNK_UNATTACHED,
3113 PD_T_PD_DEBOUNCE);
3114 else if (port->vbus_present)
3115 tcpm_set_state(port,
3116 tcpm_try_src(port) ? SRC_TRY
3117 : SNK_ATTACHED,
3118 0);
3119 else
3120 /* Wait for VBUS, but not forever */
3121 tcpm_set_state(port, PORT_RESET, PD_T_PS_SOURCE_ON);
3122 break;
3123
3124 case SRC_TRY:
3125 port->try_src_count++;
3126 tcpm_set_cc(port, tcpm_rp_cc(port));
3127 port->max_wait = 0;
3128 tcpm_set_state(port, SRC_TRY_WAIT, 0);
3129 break;
3130 case SRC_TRY_WAIT:
3131 if (port->max_wait == 0) {
3132 port->max_wait = jiffies +
3133 msecs_to_jiffies(PD_T_DRP_TRY);
3134 msecs = PD_T_DRP_TRY;
3135 } else {
3136 if (time_is_after_jiffies(port->max_wait))
3137 msecs = jiffies_to_msecs(port->max_wait -
3138 jiffies);
3139 else
3140 msecs = 0;
3141 }
3142 tcpm_set_state(port, SNK_TRYWAIT, msecs);
3143 break;
3144 case SRC_TRY_DEBOUNCE:
3145 tcpm_set_state(port, SRC_ATTACHED, PD_T_PD_DEBOUNCE);
3146 break;
3147 case SNK_TRYWAIT:
3148 tcpm_set_cc(port, TYPEC_CC_RD);
3149 tcpm_set_state(port, SNK_TRYWAIT_VBUS, PD_T_CC_DEBOUNCE);
3150 break;
3151 case SNK_TRYWAIT_VBUS:
3152 /*
3153 * TCPM stays in this state indefinitely until VBUS
3154 * is detected as long as Rp is not detected for
3155 * more than a time period of tPDDebounce.
3156 */
3157 if (port->vbus_present && tcpm_port_is_sink(port)) {
3158 tcpm_set_state(port, SNK_ATTACHED, 0);
3159 break;
3160 }
3161 if (!tcpm_port_is_sink(port))
3162 tcpm_set_state(port, SNK_TRYWAIT_DEBOUNCE, 0);
3163 break;
3164 case SNK_TRYWAIT_DEBOUNCE:
3165 tcpm_set_state(port, SNK_UNATTACHED, PD_T_PD_DEBOUNCE);
3166 break;
3167 case SNK_ATTACHED:
3168 ret = tcpm_snk_attach(port);
3169 if (ret < 0)
3170 tcpm_set_state(port, SNK_UNATTACHED, 0);
3171 else
3172 tcpm_set_state(port, SNK_STARTUP, 0);
3173 break;
3174 case SNK_STARTUP:
3175 opmode = tcpm_get_pwr_opmode(port->polarity ?
3176 port->cc2 : port->cc1);
3177 typec_set_pwr_opmode(port->typec_port, opmode);
3178 port->pwr_opmode = TYPEC_PWR_MODE_USB;
3179 port->negotiated_rev = PD_MAX_REV;
3180 port->message_id = 0;
3181 port->rx_msgid = -1;
3182 port->explicit_contract = false;
3183 tcpm_set_state(port, SNK_DISCOVERY, 0);
3184 break;
3185 case SNK_DISCOVERY:
3186 if (port->vbus_present) {
3187 tcpm_set_current_limit(port,
3188 tcpm_get_current_limit(port),
3189 5000);
3190 tcpm_set_charge(port, true);
3191 tcpm_set_state(port, SNK_WAIT_CAPABILITIES, 0);
3192 break;
3193 }
3194 /*
3195 * For DRP, timeouts differ. Also, handling is supposed to be
3196 * different and much more complex (dead battery detection;
3197 * see USB power delivery specification, section 8.3.3.6.1.5.1).
3198 */
3199 tcpm_set_state(port, hard_reset_state(port),
3200 port->port_type == TYPEC_PORT_DRP ?
3201 PD_T_DB_DETECT : PD_T_NO_RESPONSE);
3202 break;
3203 case SNK_DISCOVERY_DEBOUNCE:
3204 tcpm_set_state(port, SNK_DISCOVERY_DEBOUNCE_DONE,
3205 PD_T_CC_DEBOUNCE);
3206 break;
3207 case SNK_DISCOVERY_DEBOUNCE_DONE:
3208 if (!tcpm_port_is_disconnected(port) &&
3209 tcpm_port_is_sink(port) &&
3210 time_is_after_jiffies(port->delayed_runtime)) {
3211 tcpm_set_state(port, SNK_DISCOVERY,
3212 jiffies_to_msecs(port->delayed_runtime -
3213 jiffies));
3214 break;
3215 }
3216 tcpm_set_state(port, unattached_state(port), 0);
3217 break;
3218 case SNK_WAIT_CAPABILITIES:
3219 ret = port->tcpc->set_pd_rx(port->tcpc, true);
3220 if (ret < 0) {
3221 tcpm_set_state(port, SNK_READY, 0);
3222 break;
3223 }
3224 /*
3225 * If VBUS has never been low, and we time out waiting
3226 * for source cap, try a soft reset first, in case we
3227 * were already in a stable contract before this boot.
3228 * Do this only once.
3229 */
3230 if (port->vbus_never_low) {
3231 port->vbus_never_low = false;
3232 tcpm_set_state(port, SOFT_RESET_SEND,
3233 PD_T_SINK_WAIT_CAP);
3234 } else {
3235 tcpm_set_state(port, hard_reset_state(port),
3236 PD_T_SINK_WAIT_CAP);
3237 }
3238 break;
3239 case SNK_NEGOTIATE_CAPABILITIES:
3240 port->pd_capable = true;
3241 port->hard_reset_count = 0;
3242 ret = tcpm_pd_send_request(port);
3243 if (ret < 0) {
3244 /* Let the Source send capabilities again. */
3245 tcpm_set_state(port, SNK_WAIT_CAPABILITIES, 0);
3246 } else {
3247 tcpm_set_state_cond(port, hard_reset_state(port),
3248 PD_T_SENDER_RESPONSE);
3249 }
3250 break;
3251 case SNK_NEGOTIATE_PPS_CAPABILITIES:
3252 ret = tcpm_pd_send_pps_request(port);
3253 if (ret < 0) {
3254 port->pps_status = ret;
3255 /*
3256 * If this was called due to updates to sink
3257 * capabilities, and pps is no longer valid, we should
3258 * safely fall back to a standard PDO.
3259 */
3260 if (port->update_sink_caps)
3261 tcpm_set_state(port, SNK_NEGOTIATE_CAPABILITIES, 0);
3262 else
3263 tcpm_set_state(port, SNK_READY, 0);
3264 } else {
3265 tcpm_set_state_cond(port, hard_reset_state(port),
3266 PD_T_SENDER_RESPONSE);
3267 }
3268 break;
3269 case SNK_TRANSITION_SINK:
3270 case SNK_TRANSITION_SINK_VBUS:
3271 tcpm_set_state(port, hard_reset_state(port),
3272 PD_T_PS_TRANSITION);
3273 break;
3274 case SNK_READY:
3275 port->try_snk_count = 0;
3276 port->update_sink_caps = false;
3277 if (port->explicit_contract) {
3278 typec_set_pwr_opmode(port->typec_port,
3279 TYPEC_PWR_MODE_PD);
3280 port->pwr_opmode = TYPEC_PWR_MODE_PD;
3281 }
3282
3283 tcpm_swap_complete(port, 0);
3284 tcpm_typec_connect(port);
3285 tcpm_check_send_discover(port);
3286 tcpm_pps_complete(port, port->pps_status);
3287
3288 power_supply_changed(port->psy);
3289
3290 break;
3291
3292 /* Accessory states */
3293 case ACC_UNATTACHED:
3294 tcpm_acc_detach(port);
3295 tcpm_set_state(port, SRC_UNATTACHED, 0);
3296 break;
3297 case DEBUG_ACC_ATTACHED:
3298 case AUDIO_ACC_ATTACHED:
3299 ret = tcpm_acc_attach(port);
3300 if (ret < 0)
3301 tcpm_set_state(port, ACC_UNATTACHED, 0);
3302 break;
3303 case AUDIO_ACC_DEBOUNCE:
3304 tcpm_set_state(port, ACC_UNATTACHED, PD_T_CC_DEBOUNCE);
3305 break;
3306
3307 /* Hard_Reset states */
3308 case HARD_RESET_SEND:
3309 tcpm_pd_transmit(port, TCPC_TX_HARD_RESET, NULL);
3310 tcpm_set_state(port, HARD_RESET_START, 0);
3311 break;
3312 case HARD_RESET_START:
3313 port->hard_reset_count++;
3314 port->tcpc->set_pd_rx(port->tcpc, false);
3315 tcpm_unregister_altmodes(port);
3316 port->send_discover = true;
3317 if (port->pwr_role == TYPEC_SOURCE)
3318 tcpm_set_state(port, SRC_HARD_RESET_VBUS_OFF,
3319 PD_T_PS_HARD_RESET);
3320 else
3321 tcpm_set_state(port, SNK_HARD_RESET_SINK_OFF, 0);
3322 break;
3323 case SRC_HARD_RESET_VBUS_OFF:
3324 tcpm_set_vconn(port, true);
3325 tcpm_set_vbus(port, false);
3326 tcpm_set_roles(port, port->self_powered, TYPEC_SOURCE,
3327 tcpm_data_role_for_source(port));
3328 tcpm_set_state(port, SRC_HARD_RESET_VBUS_ON, PD_T_SRC_RECOVER);
3329 break;
3330 case SRC_HARD_RESET_VBUS_ON:
3331 tcpm_set_vbus(port, true);
3332 port->tcpc->set_pd_rx(port->tcpc, true);
3333 tcpm_set_attached_state(port, true);
3334 tcpm_set_state(port, SRC_UNATTACHED, PD_T_PS_SOURCE_ON);
3335 break;
3336 case SNK_HARD_RESET_SINK_OFF:
3337 memset(&port->pps_data, 0, sizeof(port->pps_data));
3338 tcpm_set_vconn(port, false);
3339 if (port->pd_capable)
3340 tcpm_set_charge(port, false);
3341 tcpm_set_roles(port, port->self_powered, TYPEC_SINK,
3342 tcpm_data_role_for_sink(port));
3343 /*
3344 * VBUS may or may not toggle, depending on the adapter.
3345 * If it doesn't toggle, transition to SNK_HARD_RESET_SINK_ON
3346 * directly after timeout.
3347 */
3348 tcpm_set_state(port, SNK_HARD_RESET_SINK_ON, PD_T_SAFE_0V);
3349 break;
3350 case SNK_HARD_RESET_WAIT_VBUS:
3351 /* Assume we're disconnected if VBUS doesn't come back. */
3352 tcpm_set_state(port, SNK_UNATTACHED,
3353 PD_T_SRC_RECOVER_MAX + PD_T_SRC_TURN_ON);
3354 break;
3355 case SNK_HARD_RESET_SINK_ON:
3356 /* Note: There is no guarantee that VBUS is on in this state */
3357 /*
3358 * XXX:
3359 * The specification suggests that dual mode ports in sink
3360 * mode should transition to state PE_SRC_Transition_to_default.
3361 * See USB power delivery specification chapter 8.3.3.6.1.3.
3362 * This would mean to to
3363 * - turn off VCONN, reset power supply
3364 * - request hardware reset
3365 * - turn on VCONN
3366 * - Transition to state PE_Src_Startup
3367 * SNK only ports shall transition to state Snk_Startup
3368 * (see chapter 8.3.3.3.8).
3369 * Similar, dual-mode ports in source mode should transition
3370 * to PE_SNK_Transition_to_default.
3371 */
3372 if (port->pd_capable) {
3373 tcpm_set_current_limit(port,
3374 tcpm_get_current_limit(port),
3375 5000);
3376 tcpm_set_charge(port, true);
3377 }
3378 tcpm_set_attached_state(port, true);
3379 tcpm_set_state(port, SNK_STARTUP, 0);
3380 break;
3381
3382 /* Soft_Reset states */
3383 case SOFT_RESET:
3384 port->message_id = 0;
3385 port->rx_msgid = -1;
3386 tcpm_pd_send_control(port, PD_CTRL_ACCEPT);
3387 if (port->pwr_role == TYPEC_SOURCE)
3388 tcpm_set_state(port, SRC_SEND_CAPABILITIES, 0);
3389 else
3390 tcpm_set_state(port, SNK_WAIT_CAPABILITIES, 0);
3391 break;
3392 case SOFT_RESET_SEND:
3393 port->message_id = 0;
3394 port->rx_msgid = -1;
3395 if (tcpm_pd_send_control(port, PD_CTRL_SOFT_RESET))
3396 tcpm_set_state_cond(port, hard_reset_state(port), 0);
3397 else
3398 tcpm_set_state_cond(port, hard_reset_state(port),
3399 PD_T_SENDER_RESPONSE);
3400 break;
3401
3402 /* DR_Swap states */
3403 case DR_SWAP_SEND:
3404 tcpm_pd_send_control(port, PD_CTRL_DR_SWAP);
3405 tcpm_set_state_cond(port, DR_SWAP_SEND_TIMEOUT,
3406 PD_T_SENDER_RESPONSE);
3407 break;
3408 case DR_SWAP_ACCEPT:
3409 tcpm_pd_send_control(port, PD_CTRL_ACCEPT);
3410 tcpm_set_state_cond(port, DR_SWAP_CHANGE_DR, 0);
3411 break;
3412 case DR_SWAP_SEND_TIMEOUT:
3413 tcpm_swap_complete(port, -ETIMEDOUT);
3414 tcpm_set_state(port, ready_state(port), 0);
3415 break;
3416 case DR_SWAP_CHANGE_DR:
3417 if (port->data_role == TYPEC_HOST) {
3418 tcpm_unregister_altmodes(port);
3419 tcpm_set_roles(port, true, port->pwr_role,
3420 TYPEC_DEVICE);
3421 } else {
3422 tcpm_set_roles(port, true, port->pwr_role,
3423 TYPEC_HOST);
3424 port->send_discover = true;
3425 }
3426 tcpm_set_state(port, ready_state(port), 0);
3427 break;
3428
3429 /* PR_Swap states */
3430 case PR_SWAP_ACCEPT:
3431 tcpm_pd_send_control(port, PD_CTRL_ACCEPT);
3432 tcpm_set_state(port, PR_SWAP_START, 0);
3433 break;
3434 case PR_SWAP_SEND:
3435 tcpm_pd_send_control(port, PD_CTRL_PR_SWAP);
3436 tcpm_set_state_cond(port, PR_SWAP_SEND_TIMEOUT,
3437 PD_T_SENDER_RESPONSE);
3438 break;
3439 case PR_SWAP_SEND_TIMEOUT:
3440 tcpm_swap_complete(port, -ETIMEDOUT);
3441 tcpm_set_state(port, ready_state(port), 0);
3442 break;
3443 case PR_SWAP_START:
3444 if (port->pwr_role == TYPEC_SOURCE)
3445 tcpm_set_state(port, PR_SWAP_SRC_SNK_TRANSITION_OFF,
3446 PD_T_SRC_TRANSITION);
3447 else
3448 tcpm_set_state(port, PR_SWAP_SNK_SRC_SINK_OFF, 0);
3449 break;
3450 case PR_SWAP_SRC_SNK_TRANSITION_OFF:
3451 tcpm_set_vbus(port, false);
3452 port->explicit_contract = false;
3453 /* allow time for Vbus discharge, must be < tSrcSwapStdby */
3454 tcpm_set_state(port, PR_SWAP_SRC_SNK_SOURCE_OFF,
3455 PD_T_SRCSWAPSTDBY);
3456 break;
3457 case PR_SWAP_SRC_SNK_SOURCE_OFF:
3458 tcpm_set_cc(port, TYPEC_CC_RD);
3459 /* allow CC debounce */
3460 tcpm_set_state(port, PR_SWAP_SRC_SNK_SOURCE_OFF_CC_DEBOUNCED,
3461 PD_T_CC_DEBOUNCE);
3462 break;
3463 case PR_SWAP_SRC_SNK_SOURCE_OFF_CC_DEBOUNCED:
3464 /*
3465 * USB-PD standard, 6.2.1.4, Port Power Role:
3466 * "During the Power Role Swap Sequence, for the initial Source
3467 * Port, the Port Power Role field shall be set to Sink in the
3468 * PS_RDY Message indicating that the initial Source’s power
3469 * supply is turned off"
3470 */
3471 tcpm_set_pwr_role(port, TYPEC_SINK);
3472 if (tcpm_pd_send_control(port, PD_CTRL_PS_RDY)) {
3473 tcpm_set_state(port, ERROR_RECOVERY, 0);
3474 break;
3475 }
3476 tcpm_set_state_cond(port, SNK_UNATTACHED, PD_T_PS_SOURCE_ON);
3477 break;
3478 case PR_SWAP_SRC_SNK_SINK_ON:
3479 tcpm_set_state(port, SNK_STARTUP, 0);
3480 break;
3481 case PR_SWAP_SNK_SRC_SINK_OFF:
3482 tcpm_set_charge(port, false);
3483 tcpm_set_state(port, hard_reset_state(port),
3484 PD_T_PS_SOURCE_OFF);
3485 break;
3486 case PR_SWAP_SNK_SRC_SOURCE_ON:
3487 tcpm_set_cc(port, tcpm_rp_cc(port));
3488 tcpm_set_vbus(port, true);
3489 /*
3490 * allow time VBUS ramp-up, must be < tNewSrc
3491 * Also, this window overlaps with CC debounce as well.
3492 * So, Wait for the max of two which is PD_T_NEWSRC
3493 */
3494 tcpm_set_state(port, PR_SWAP_SNK_SRC_SOURCE_ON_VBUS_RAMPED_UP,
3495 PD_T_NEWSRC);
3496 break;
3497 case PR_SWAP_SNK_SRC_SOURCE_ON_VBUS_RAMPED_UP:
3498 /*
3499 * USB PD standard, 6.2.1.4:
3500 * "Subsequent Messages initiated by the Policy Engine,
3501 * such as the PS_RDY Message sent to indicate that Vbus
3502 * is ready, will have the Port Power Role field set to
3503 * Source."
3504 */
3505 tcpm_set_pwr_role(port, TYPEC_SOURCE);
3506 tcpm_pd_send_control(port, PD_CTRL_PS_RDY);
3507 tcpm_set_state(port, SRC_STARTUP, 0);
3508 break;
3509
3510 case VCONN_SWAP_ACCEPT:
3511 tcpm_pd_send_control(port, PD_CTRL_ACCEPT);
3512 tcpm_set_state(port, VCONN_SWAP_START, 0);
3513 break;
3514 case VCONN_SWAP_SEND:
3515 tcpm_pd_send_control(port, PD_CTRL_VCONN_SWAP);
3516 tcpm_set_state(port, VCONN_SWAP_SEND_TIMEOUT,
3517 PD_T_SENDER_RESPONSE);
3518 break;
3519 case VCONN_SWAP_SEND_TIMEOUT:
3520 tcpm_swap_complete(port, -ETIMEDOUT);
3521 tcpm_set_state(port, ready_state(port), 0);
3522 break;
3523 case VCONN_SWAP_START:
3524 if (port->vconn_role == TYPEC_SOURCE)
3525 tcpm_set_state(port, VCONN_SWAP_WAIT_FOR_VCONN, 0);
3526 else
3527 tcpm_set_state(port, VCONN_SWAP_TURN_ON_VCONN, 0);
3528 break;
3529 case VCONN_SWAP_WAIT_FOR_VCONN:
3530 tcpm_set_state(port, hard_reset_state(port),
3531 PD_T_VCONN_SOURCE_ON);
3532 break;
3533 case VCONN_SWAP_TURN_ON_VCONN:
3534 tcpm_set_vconn(port, true);
3535 tcpm_pd_send_control(port, PD_CTRL_PS_RDY);
3536 tcpm_set_state(port, ready_state(port), 0);
3537 break;
3538 case VCONN_SWAP_TURN_OFF_VCONN:
3539 tcpm_set_vconn(port, false);
3540 tcpm_set_state(port, ready_state(port), 0);
3541 break;
3542
3543 case DR_SWAP_CANCEL:
3544 case PR_SWAP_CANCEL:
3545 case VCONN_SWAP_CANCEL:
3546 tcpm_swap_complete(port, port->swap_status);
3547 if (port->pwr_role == TYPEC_SOURCE)
3548 tcpm_set_state(port, SRC_READY, 0);
3549 else
3550 tcpm_set_state(port, SNK_READY, 0);
3551 break;
3552
3553 case BIST_RX:
3554 switch (BDO_MODE_MASK(port->bist_request)) {
3555 case BDO_MODE_CARRIER2:
3556 tcpm_pd_transmit(port, TCPC_TX_BIST_MODE_2, NULL);
3557 break;
3558 default:
3559 break;
3560 }
3561 /* Always switch to unattached state */
3562 tcpm_set_state(port, unattached_state(port), 0);
3563 break;
3564 case GET_STATUS_SEND:
3565 tcpm_pd_send_control(port, PD_CTRL_GET_STATUS);
3566 tcpm_set_state(port, GET_STATUS_SEND_TIMEOUT,
3567 PD_T_SENDER_RESPONSE);
3568 break;
3569 case GET_STATUS_SEND_TIMEOUT:
3570 tcpm_set_state(port, ready_state(port), 0);
3571 break;
3572 case GET_PPS_STATUS_SEND:
3573 tcpm_pd_send_control(port, PD_CTRL_GET_PPS_STATUS);
3574 tcpm_set_state(port, GET_PPS_STATUS_SEND_TIMEOUT,
3575 PD_T_SENDER_RESPONSE);
3576 break;
3577 case GET_PPS_STATUS_SEND_TIMEOUT:
3578 tcpm_set_state(port, ready_state(port), 0);
3579 break;
3580 case ERROR_RECOVERY:
3581 tcpm_swap_complete(port, -EPROTO);
3582 tcpm_pps_complete(port, -EPROTO);
3583 tcpm_set_state(port, PORT_RESET, 0);
3584 break;
3585 case PORT_RESET:
3586 tcpm_reset_port(port);
3587 tcpm_set_cc(port, TYPEC_CC_OPEN);
3588 tcpm_set_state(port, PORT_RESET_WAIT_OFF,
3589 PD_T_ERROR_RECOVERY);
3590 break;
3591 case PORT_RESET_WAIT_OFF:
3592 tcpm_set_state(port,
3593 tcpm_default_state(port),
3594 port->vbus_present ? PD_T_PS_SOURCE_OFF : 0);
3595 break;
3596 default:
3597 WARN(1, "Unexpected port state %d\n", port->state);
3598 break;
3599 }
3600 }
3601
3602 static void tcpm_state_machine_work(struct work_struct *work)
3603 {
3604 struct tcpm_port *port = container_of(work, struct tcpm_port,
3605 state_machine.work);
3606 enum tcpm_state prev_state;
3607
3608 mutex_lock(&port->lock);
3609 port->state_machine_running = true;
3610
3611 if (port->queued_message && tcpm_send_queued_message(port))
3612 goto done;
3613
3614 /* If we were queued due to a delayed state change, update it now */
3615 if (port->delayed_state) {
3616 tcpm_log(port, "state change %s -> %s [delayed %ld ms]",
3617 tcpm_states[port->state],
3618 tcpm_states[port->delayed_state], port->delay_ms);
3619 port->prev_state = port->state;
3620 port->state = port->delayed_state;
3621 port->delayed_state = INVALID_STATE;
3622 }
3623
3624 /*
3625 * Continue running as long as we have (non-delayed) state changes
3626 * to make.
3627 */
3628 do {
3629 prev_state = port->state;
3630 run_state_machine(port);
3631 if (port->queued_message)
3632 tcpm_send_queued_message(port);
3633 } while (port->state != prev_state && !port->delayed_state);
3634
3635 done:
3636 port->state_machine_running = false;
3637 mutex_unlock(&port->lock);
3638 }
3639
3640 static void _tcpm_cc_change(struct tcpm_port *port, enum typec_cc_status cc1,
3641 enum typec_cc_status cc2)
3642 {
3643 enum typec_cc_status old_cc1, old_cc2;
3644 enum tcpm_state new_state;
3645
3646 old_cc1 = port->cc1;
3647 old_cc2 = port->cc2;
3648 port->cc1 = cc1;
3649 port->cc2 = cc2;
3650
3651 tcpm_log_force(port,
3652 "CC1: %u -> %u, CC2: %u -> %u [state %s, polarity %d, %s]",
3653 old_cc1, cc1, old_cc2, cc2, tcpm_states[port->state],
3654 port->polarity,
3655 tcpm_port_is_disconnected(port) ? "disconnected"
3656 : "connected");
3657
3658 switch (port->state) {
3659 case TOGGLING:
3660 if (tcpm_port_is_debug(port) || tcpm_port_is_audio(port) ||
3661 tcpm_port_is_source(port))
3662 tcpm_set_state(port, SRC_ATTACH_WAIT, 0);
3663 else if (tcpm_port_is_sink(port))
3664 tcpm_set_state(port, SNK_ATTACH_WAIT, 0);
3665 break;
3666 case SRC_UNATTACHED:
3667 case ACC_UNATTACHED:
3668 if (tcpm_port_is_debug(port) || tcpm_port_is_audio(port) ||
3669 tcpm_port_is_source(port))
3670 tcpm_set_state(port, SRC_ATTACH_WAIT, 0);
3671 break;
3672 case SRC_ATTACH_WAIT:
3673 if (tcpm_port_is_disconnected(port) ||
3674 tcpm_port_is_audio_detached(port))
3675 tcpm_set_state(port, SRC_UNATTACHED, 0);
3676 else if (cc1 != old_cc1 || cc2 != old_cc2)
3677 tcpm_set_state(port, SRC_ATTACH_WAIT, 0);
3678 break;
3679 case SRC_ATTACHED:
3680 case SRC_SEND_CAPABILITIES:
3681 case SRC_READY:
3682 if (tcpm_port_is_disconnected(port) ||
3683 !tcpm_port_is_source(port)) {
3684 if (port->port_type == TYPEC_PORT_SRC)
3685 tcpm_set_state(port, SRC_UNATTACHED, 0);
3686 else
3687 tcpm_set_state(port, SNK_UNATTACHED, 0);
3688 }
3689 break;
3690 case SNK_UNATTACHED:
3691 if (tcpm_port_is_sink(port))
3692 tcpm_set_state(port, SNK_ATTACH_WAIT, 0);
3693 break;
3694 case SNK_ATTACH_WAIT:
3695 if ((port->cc1 == TYPEC_CC_OPEN &&
3696 port->cc2 != TYPEC_CC_OPEN) ||
3697 (port->cc1 != TYPEC_CC_OPEN &&
3698 port->cc2 == TYPEC_CC_OPEN))
3699 new_state = SNK_DEBOUNCED;
3700 else if (tcpm_port_is_disconnected(port))
3701 new_state = SNK_UNATTACHED;
3702 else
3703 break;
3704 if (new_state != port->delayed_state)
3705 tcpm_set_state(port, SNK_ATTACH_WAIT, 0);
3706 break;
3707 case SNK_DEBOUNCED:
3708 if (tcpm_port_is_disconnected(port))
3709 new_state = SNK_UNATTACHED;
3710 else if (port->vbus_present)
3711 new_state = tcpm_try_src(port) ? SRC_TRY : SNK_ATTACHED;
3712 else
3713 new_state = SNK_UNATTACHED;
3714 if (new_state != port->delayed_state)
3715 tcpm_set_state(port, SNK_DEBOUNCED, 0);
3716 break;
3717 case SNK_READY:
3718 if (tcpm_port_is_disconnected(port))
3719 tcpm_set_state(port, unattached_state(port), 0);
3720 else if (!port->pd_capable &&
3721 (cc1 != old_cc1 || cc2 != old_cc2))
3722 tcpm_set_current_limit(port,
3723 tcpm_get_current_limit(port),
3724 5000);
3725 break;
3726
3727 case AUDIO_ACC_ATTACHED:
3728 if (cc1 == TYPEC_CC_OPEN || cc2 == TYPEC_CC_OPEN)
3729 tcpm_set_state(port, AUDIO_ACC_DEBOUNCE, 0);
3730 break;
3731 case AUDIO_ACC_DEBOUNCE:
3732 if (tcpm_port_is_audio(port))
3733 tcpm_set_state(port, AUDIO_ACC_ATTACHED, 0);
3734 break;
3735
3736 case DEBUG_ACC_ATTACHED:
3737 if (cc1 == TYPEC_CC_OPEN || cc2 == TYPEC_CC_OPEN)
3738 tcpm_set_state(port, ACC_UNATTACHED, 0);
3739 break;
3740
3741 case SNK_TRY:
3742 /* Do nothing, waiting for timeout */
3743 break;
3744
3745 case SNK_DISCOVERY:
3746 /* CC line is unstable, wait for debounce */
3747 if (tcpm_port_is_disconnected(port))
3748 tcpm_set_state(port, SNK_DISCOVERY_DEBOUNCE, 0);
3749 break;
3750 case SNK_DISCOVERY_DEBOUNCE:
3751 break;
3752
3753 case SRC_TRYWAIT:
3754 /* Hand over to state machine if needed */
3755 if (!port->vbus_present && tcpm_port_is_source(port))
3756 tcpm_set_state(port, SRC_TRYWAIT_DEBOUNCE, 0);
3757 break;
3758 case SRC_TRYWAIT_DEBOUNCE:
3759 if (port->vbus_present || !tcpm_port_is_source(port))
3760 tcpm_set_state(port, SRC_TRYWAIT, 0);
3761 break;
3762 case SNK_TRY_WAIT_DEBOUNCE:
3763 if (!tcpm_port_is_sink(port)) {
3764 port->max_wait = 0;
3765 tcpm_set_state(port, SRC_TRYWAIT, 0);
3766 }
3767 break;
3768 case SRC_TRY_WAIT:
3769 if (tcpm_port_is_source(port))
3770 tcpm_set_state(port, SRC_TRY_DEBOUNCE, 0);
3771 break;
3772 case SRC_TRY_DEBOUNCE:
3773 tcpm_set_state(port, SRC_TRY_WAIT, 0);
3774 break;
3775 case SNK_TRYWAIT_DEBOUNCE:
3776 if (tcpm_port_is_sink(port))
3777 tcpm_set_state(port, SNK_TRYWAIT_VBUS, 0);
3778 break;
3779 case SNK_TRYWAIT_VBUS:
3780 if (!tcpm_port_is_sink(port))
3781 tcpm_set_state(port, SNK_TRYWAIT_DEBOUNCE, 0);
3782 break;
3783 case SNK_TRYWAIT:
3784 /* Do nothing, waiting for tCCDebounce */
3785 break;
3786 case PR_SWAP_SNK_SRC_SINK_OFF:
3787 case PR_SWAP_SRC_SNK_TRANSITION_OFF:
3788 case PR_SWAP_SRC_SNK_SOURCE_OFF:
3789 case PR_SWAP_SRC_SNK_SOURCE_OFF_CC_DEBOUNCED:
3790 case PR_SWAP_SNK_SRC_SOURCE_ON:
3791 /*
3792 * CC state change is expected in PR_SWAP
3793 * Ignore it.
3794 */
3795 break;
3796
3797 default:
3798 if (tcpm_port_is_disconnected(port))
3799 tcpm_set_state(port, unattached_state(port), 0);
3800 break;
3801 }
3802 }
3803
3804 static void _tcpm_pd_vbus_on(struct tcpm_port *port)
3805 {
3806 tcpm_log_force(port, "VBUS on");
3807 port->vbus_present = true;
3808 switch (port->state) {
3809 case SNK_TRANSITION_SINK_VBUS:
3810 port->explicit_contract = true;
3811 tcpm_set_state(port, SNK_READY, 0);
3812 break;
3813 case SNK_DISCOVERY:
3814 tcpm_set_state(port, SNK_DISCOVERY, 0);
3815 break;
3816
3817 case SNK_DEBOUNCED:
3818 tcpm_set_state(port, tcpm_try_src(port) ? SRC_TRY
3819 : SNK_ATTACHED,
3820 0);
3821 break;
3822 case SNK_HARD_RESET_WAIT_VBUS:
3823 tcpm_set_state(port, SNK_HARD_RESET_SINK_ON, 0);
3824 break;
3825 case SRC_ATTACHED:
3826 tcpm_set_state(port, SRC_STARTUP, 0);
3827 break;
3828 case SRC_HARD_RESET_VBUS_ON:
3829 tcpm_set_state(port, SRC_STARTUP, 0);
3830 break;
3831
3832 case SNK_TRY:
3833 /* Do nothing, waiting for timeout */
3834 break;
3835 case SRC_TRYWAIT:
3836 /* Do nothing, Waiting for Rd to be detected */
3837 break;
3838 case SRC_TRYWAIT_DEBOUNCE:
3839 tcpm_set_state(port, SRC_TRYWAIT, 0);
3840 break;
3841 case SNK_TRY_WAIT_DEBOUNCE:
3842 /* Do nothing, waiting for PD_DEBOUNCE to do be done */
3843 break;
3844 case SNK_TRYWAIT:
3845 /* Do nothing, waiting for tCCDebounce */
3846 break;
3847 case SNK_TRYWAIT_VBUS:
3848 if (tcpm_port_is_sink(port))
3849 tcpm_set_state(port, SNK_ATTACHED, 0);
3850 break;
3851 case SNK_TRYWAIT_DEBOUNCE:
3852 /* Do nothing, waiting for Rp */
3853 break;
3854 case SRC_TRY_WAIT:
3855 case SRC_TRY_DEBOUNCE:
3856 /* Do nothing, waiting for sink detection */
3857 break;
3858 default:
3859 break;
3860 }
3861 }
3862
3863 static void _tcpm_pd_vbus_off(struct tcpm_port *port)
3864 {
3865 tcpm_log_force(port, "VBUS off");
3866 port->vbus_present = false;
3867 port->vbus_never_low = false;
3868 switch (port->state) {
3869 case SNK_HARD_RESET_SINK_OFF:
3870 tcpm_set_state(port, SNK_HARD_RESET_WAIT_VBUS, 0);
3871 break;
3872 case SRC_HARD_RESET_VBUS_OFF:
3873 tcpm_set_state(port, SRC_HARD_RESET_VBUS_ON, 0);
3874 break;
3875 case HARD_RESET_SEND:
3876 break;
3877
3878 case SNK_TRY:
3879 /* Do nothing, waiting for timeout */
3880 break;
3881 case SRC_TRYWAIT:
3882 /* Hand over to state machine if needed */
3883 if (tcpm_port_is_source(port))
3884 tcpm_set_state(port, SRC_TRYWAIT_DEBOUNCE, 0);
3885 break;
3886 case SNK_TRY_WAIT_DEBOUNCE:
3887 /* Do nothing, waiting for PD_DEBOUNCE to do be done */
3888 break;
3889 case SNK_TRYWAIT:
3890 case SNK_TRYWAIT_VBUS:
3891 case SNK_TRYWAIT_DEBOUNCE:
3892 break;
3893 case SNK_ATTACH_WAIT:
3894 tcpm_set_state(port, SNK_UNATTACHED, 0);
3895 break;
3896
3897 case SNK_NEGOTIATE_CAPABILITIES:
3898 break;
3899
3900 case PR_SWAP_SRC_SNK_TRANSITION_OFF:
3901 tcpm_set_state(port, PR_SWAP_SRC_SNK_SOURCE_OFF, 0);
3902 break;
3903
3904 case PR_SWAP_SNK_SRC_SINK_OFF:
3905 /* Do nothing, expected */
3906 break;
3907
3908 case PORT_RESET_WAIT_OFF:
3909 tcpm_set_state(port, tcpm_default_state(port), 0);
3910 break;
3911 case SRC_TRY_WAIT:
3912 case SRC_TRY_DEBOUNCE:
3913 /* Do nothing, waiting for sink detection */
3914 break;
3915 default:
3916 if (port->pwr_role == TYPEC_SINK &&
3917 port->attached)
3918 tcpm_set_state(port, SNK_UNATTACHED, 0);
3919 break;
3920 }
3921 }
3922
3923 static void _tcpm_pd_hard_reset(struct tcpm_port *port)
3924 {
3925 tcpm_log_force(port, "Received hard reset");
3926 /*
3927 * If we keep receiving hard reset requests, executing the hard reset
3928 * must have failed. Revert to error recovery if that happens.
3929 */
3930 tcpm_set_state(port,
3931 port->hard_reset_count < PD_N_HARD_RESET_COUNT ?
3932 HARD_RESET_START : ERROR_RECOVERY,
3933 0);
3934 }
3935
3936 static void tcpm_pd_event_handler(struct work_struct *work)
3937 {
3938 struct tcpm_port *port = container_of(work, struct tcpm_port,
3939 event_work);
3940 u32 events;
3941
3942 mutex_lock(&port->lock);
3943
3944 spin_lock(&port->pd_event_lock);
3945 while (port->pd_events) {
3946 events = port->pd_events;
3947 port->pd_events = 0;
3948 spin_unlock(&port->pd_event_lock);
3949 if (events & TCPM_RESET_EVENT)
3950 _tcpm_pd_hard_reset(port);
3951 if (events & TCPM_VBUS_EVENT) {
3952 bool vbus;
3953
3954 vbus = port->tcpc->get_vbus(port->tcpc);
3955 if (vbus)
3956 _tcpm_pd_vbus_on(port);
3957 else
3958 _tcpm_pd_vbus_off(port);
3959 }
3960 if (events & TCPM_CC_EVENT) {
3961 enum typec_cc_status cc1, cc2;
3962
3963 if (port->tcpc->get_cc(port->tcpc, &cc1, &cc2) == 0)
3964 _tcpm_cc_change(port, cc1, cc2);
3965 }
3966 spin_lock(&port->pd_event_lock);
3967 }
3968 spin_unlock(&port->pd_event_lock);
3969 mutex_unlock(&port->lock);
3970 }
3971
3972 void tcpm_cc_change(struct tcpm_port *port)
3973 {
3974 spin_lock(&port->pd_event_lock);
3975 port->pd_events |= TCPM_CC_EVENT;
3976 spin_unlock(&port->pd_event_lock);
3977 queue_work(port->wq, &port->event_work);
3978 }
3979 EXPORT_SYMBOL_GPL(tcpm_cc_change);
3980
3981 void tcpm_vbus_change(struct tcpm_port *port)
3982 {
3983 spin_lock(&port->pd_event_lock);
3984 port->pd_events |= TCPM_VBUS_EVENT;
3985 spin_unlock(&port->pd_event_lock);
3986 queue_work(port->wq, &port->event_work);
3987 }
3988 EXPORT_SYMBOL_GPL(tcpm_vbus_change);
3989
3990 void tcpm_pd_hard_reset(struct tcpm_port *port)
3991 {
3992 spin_lock(&port->pd_event_lock);
3993 port->pd_events = TCPM_RESET_EVENT;
3994 spin_unlock(&port->pd_event_lock);
3995 queue_work(port->wq, &port->event_work);
3996 }
3997 EXPORT_SYMBOL_GPL(tcpm_pd_hard_reset);
3998
3999 static int tcpm_dr_set(struct typec_port *p, enum typec_data_role data)
4000 {
4001 struct tcpm_port *port = typec_get_drvdata(p);
4002 int ret;
4003
4004 mutex_lock(&port->swap_lock);
4005 mutex_lock(&port->lock);
4006
4007 if (port->typec_caps.data != TYPEC_PORT_DRD) {
4008 ret = -EINVAL;
4009 goto port_unlock;
4010 }
4011 if (port->state != SRC_READY && port->state != SNK_READY) {
4012 ret = -EAGAIN;
4013 goto port_unlock;
4014 }
4015
4016 if (port->data_role == data) {
4017 ret = 0;
4018 goto port_unlock;
4019 }
4020
4021 /*
4022 * XXX
4023 * 6.3.9: If an alternate mode is active, a request to swap
4024 * alternate modes shall trigger a port reset.
4025 * Reject data role swap request in this case.
4026 */
4027
4028 if (!port->pd_capable) {
4029 /*
4030 * If the partner is not PD capable, reset the port to
4031 * trigger a role change. This can only work if a preferred
4032 * role is configured, and if it matches the requested role.
4033 */
4034 if (port->try_role == TYPEC_NO_PREFERRED_ROLE ||
4035 port->try_role == port->pwr_role) {
4036 ret = -EINVAL;
4037 goto port_unlock;
4038 }
4039 port->non_pd_role_swap = true;
4040 tcpm_set_state(port, PORT_RESET, 0);
4041 } else {
4042 tcpm_set_state(port, DR_SWAP_SEND, 0);
4043 }
4044
4045 port->swap_status = 0;
4046 port->swap_pending = true;
4047 reinit_completion(&port->swap_complete);
4048 mutex_unlock(&port->lock);
4049
4050 if (!wait_for_completion_timeout(&port->swap_complete,
4051 msecs_to_jiffies(PD_ROLE_SWAP_TIMEOUT)))
4052 ret = -ETIMEDOUT;
4053 else
4054 ret = port->swap_status;
4055
4056 port->non_pd_role_swap = false;
4057 goto swap_unlock;
4058
4059 port_unlock:
4060 mutex_unlock(&port->lock);
4061 swap_unlock:
4062 mutex_unlock(&port->swap_lock);
4063 return ret;
4064 }
4065
4066 static int tcpm_pr_set(struct typec_port *p, enum typec_role role)
4067 {
4068 struct tcpm_port *port = typec_get_drvdata(p);
4069 int ret;
4070
4071 mutex_lock(&port->swap_lock);
4072 mutex_lock(&port->lock);
4073
4074 if (port->port_type != TYPEC_PORT_DRP) {
4075 ret = -EINVAL;
4076 goto port_unlock;
4077 }
4078 if (port->state != SRC_READY && port->state != SNK_READY) {
4079 ret = -EAGAIN;
4080 goto port_unlock;
4081 }
4082
4083 if (role == port->pwr_role) {
4084 ret = 0;
4085 goto port_unlock;
4086 }
4087
4088 port->swap_status = 0;
4089 port->swap_pending = true;
4090 reinit_completion(&port->swap_complete);
4091 tcpm_set_state(port, PR_SWAP_SEND, 0);
4092 mutex_unlock(&port->lock);
4093
4094 if (!wait_for_completion_timeout(&port->swap_complete,
4095 msecs_to_jiffies(PD_ROLE_SWAP_TIMEOUT)))
4096 ret = -ETIMEDOUT;
4097 else
4098 ret = port->swap_status;
4099
4100 goto swap_unlock;
4101
4102 port_unlock:
4103 mutex_unlock(&port->lock);
4104 swap_unlock:
4105 mutex_unlock(&port->swap_lock);
4106 return ret;
4107 }
4108
4109 static int tcpm_vconn_set(struct typec_port *p, enum typec_role role)
4110 {
4111 struct tcpm_port *port = typec_get_drvdata(p);
4112 int ret;
4113
4114 mutex_lock(&port->swap_lock);
4115 mutex_lock(&port->lock);
4116
4117 if (port->state != SRC_READY && port->state != SNK_READY) {
4118 ret = -EAGAIN;
4119 goto port_unlock;
4120 }
4121
4122 if (role == port->vconn_role) {
4123 ret = 0;
4124 goto port_unlock;
4125 }
4126
4127 port->swap_status = 0;
4128 port->swap_pending = true;
4129 reinit_completion(&port->swap_complete);
4130 tcpm_set_state(port, VCONN_SWAP_SEND, 0);
4131 mutex_unlock(&port->lock);
4132
4133 if (!wait_for_completion_timeout(&port->swap_complete,
4134 msecs_to_jiffies(PD_ROLE_SWAP_TIMEOUT)))
4135 ret = -ETIMEDOUT;
4136 else
4137 ret = port->swap_status;
4138
4139 goto swap_unlock;
4140
4141 port_unlock:
4142 mutex_unlock(&port->lock);
4143 swap_unlock:
4144 mutex_unlock(&port->swap_lock);
4145 return ret;
4146 }
4147
4148 static int tcpm_try_role(struct typec_port *p, int role)
4149 {
4150 struct tcpm_port *port = typec_get_drvdata(p);
4151 struct tcpc_dev *tcpc = port->tcpc;
4152 int ret = 0;
4153
4154 mutex_lock(&port->lock);
4155 if (tcpc->try_role)
4156 ret = tcpc->try_role(tcpc, role);
4157 if (!ret)
4158 port->try_role = role;
4159 port->try_src_count = 0;
4160 port->try_snk_count = 0;
4161 mutex_unlock(&port->lock);
4162
4163 return ret;
4164 }
4165
4166 static int tcpm_pps_set_op_curr(struct tcpm_port *port, u16 op_curr)
4167 {
4168 unsigned int target_mw;
4169 int ret;
4170
4171 mutex_lock(&port->swap_lock);
4172 mutex_lock(&port->lock);
4173
4174 if (!port->pps_data.active) {
4175 ret = -EOPNOTSUPP;
4176 goto port_unlock;
4177 }
4178
4179 if (port->state != SNK_READY) {
4180 ret = -EAGAIN;
4181 goto port_unlock;
4182 }
4183
4184 if (op_curr > port->pps_data.max_curr) {
4185 ret = -EINVAL;
4186 goto port_unlock;
4187 }
4188
4189 target_mw = (op_curr * port->pps_data.out_volt) / 1000;
4190 if (target_mw < port->operating_snk_mw) {
4191 ret = -EINVAL;
4192 goto port_unlock;
4193 }
4194
4195 /* Round down operating current to align with PPS valid steps */
4196 op_curr = op_curr - (op_curr % RDO_PROG_CURR_MA_STEP);
4197
4198 reinit_completion(&port->pps_complete);
4199 port->pps_data.op_curr = op_curr;
4200 port->pps_status = 0;
4201 port->pps_pending = true;
4202 tcpm_set_state(port, SNK_NEGOTIATE_PPS_CAPABILITIES, 0);
4203 mutex_unlock(&port->lock);
4204
4205 if (!wait_for_completion_timeout(&port->pps_complete,
4206 msecs_to_jiffies(PD_PPS_CTRL_TIMEOUT)))
4207 ret = -ETIMEDOUT;
4208 else
4209 ret = port->pps_status;
4210
4211 goto swap_unlock;
4212
4213 port_unlock:
4214 mutex_unlock(&port->lock);
4215 swap_unlock:
4216 mutex_unlock(&port->swap_lock);
4217
4218 return ret;
4219 }
4220
4221 static int tcpm_pps_set_out_volt(struct tcpm_port *port, u16 out_volt)
4222 {
4223 unsigned int target_mw;
4224 int ret;
4225
4226 mutex_lock(&port->swap_lock);
4227 mutex_lock(&port->lock);
4228
4229 if (!port->pps_data.active) {
4230 ret = -EOPNOTSUPP;
4231 goto port_unlock;
4232 }
4233
4234 if (port->state != SNK_READY) {
4235 ret = -EAGAIN;
4236 goto port_unlock;
4237 }
4238
4239 if (out_volt < port->pps_data.min_volt ||
4240 out_volt > port->pps_data.max_volt) {
4241 ret = -EINVAL;
4242 goto port_unlock;
4243 }
4244
4245 target_mw = (port->pps_data.op_curr * out_volt) / 1000;
4246 if (target_mw < port->operating_snk_mw) {
4247 ret = -EINVAL;
4248 goto port_unlock;
4249 }
4250
4251 /* Round down output voltage to align with PPS valid steps */
4252 out_volt = out_volt - (out_volt % RDO_PROG_VOLT_MV_STEP);
4253
4254 reinit_completion(&port->pps_complete);
4255 port->pps_data.out_volt = out_volt;
4256 port->pps_status = 0;
4257 port->pps_pending = true;
4258 tcpm_set_state(port, SNK_NEGOTIATE_PPS_CAPABILITIES, 0);
4259 mutex_unlock(&port->lock);
4260
4261 if (!wait_for_completion_timeout(&port->pps_complete,
4262 msecs_to_jiffies(PD_PPS_CTRL_TIMEOUT)))
4263 ret = -ETIMEDOUT;
4264 else
4265 ret = port->pps_status;
4266
4267 goto swap_unlock;
4268
4269 port_unlock:
4270 mutex_unlock(&port->lock);
4271 swap_unlock:
4272 mutex_unlock(&port->swap_lock);
4273
4274 return ret;
4275 }
4276
4277 static int tcpm_pps_activate(struct tcpm_port *port, bool activate)
4278 {
4279 int ret = 0;
4280
4281 mutex_lock(&port->swap_lock);
4282 mutex_lock(&port->lock);
4283
4284 if (!port->pps_data.supported) {
4285 ret = -EOPNOTSUPP;
4286 goto port_unlock;
4287 }
4288
4289 /* Trying to deactivate PPS when already deactivated so just bail */
4290 if (!port->pps_data.active && !activate)
4291 goto port_unlock;
4292
4293 if (port->state != SNK_READY) {
4294 ret = -EAGAIN;
4295 goto port_unlock;
4296 }
4297
4298 reinit_completion(&port->pps_complete);
4299 port->pps_status = 0;
4300 port->pps_pending = true;
4301
4302 /* Trigger PPS request or move back to standard PDO contract */
4303 if (activate) {
4304 port->pps_data.out_volt = port->supply_voltage;
4305 port->pps_data.op_curr = port->current_limit;
4306 tcpm_set_state(port, SNK_NEGOTIATE_PPS_CAPABILITIES, 0);
4307 } else {
4308 tcpm_set_state(port, SNK_NEGOTIATE_CAPABILITIES, 0);
4309 }
4310 mutex_unlock(&port->lock);
4311
4312 if (!wait_for_completion_timeout(&port->pps_complete,
4313 msecs_to_jiffies(PD_PPS_CTRL_TIMEOUT)))
4314 ret = -ETIMEDOUT;
4315 else
4316 ret = port->pps_status;
4317
4318 goto swap_unlock;
4319
4320 port_unlock:
4321 mutex_unlock(&port->lock);
4322 swap_unlock:
4323 mutex_unlock(&port->swap_lock);
4324
4325 return ret;
4326 }
4327
4328 static void tcpm_init(struct tcpm_port *port)
4329 {
4330 enum typec_cc_status cc1, cc2;
4331
4332 port->tcpc->init(port->tcpc);
4333
4334 tcpm_reset_port(port);
4335
4336 /*
4337 * XXX
4338 * Should possibly wait for VBUS to settle if it was enabled locally
4339 * since tcpm_reset_port() will disable VBUS.
4340 */
4341 port->vbus_present = port->tcpc->get_vbus(port->tcpc);
4342 if (port->vbus_present)
4343 port->vbus_never_low = true;
4344
4345 tcpm_set_state(port, tcpm_default_state(port), 0);
4346
4347 if (port->tcpc->get_cc(port->tcpc, &cc1, &cc2) == 0)
4348 _tcpm_cc_change(port, cc1, cc2);
4349
4350 /*
4351 * Some adapters need a clean slate at startup, and won't recover
4352 * otherwise. So do not try to be fancy and force a clean disconnect.
4353 */
4354 tcpm_set_state(port, PORT_RESET, 0);
4355 }
4356
4357 static int tcpm_port_type_set(struct typec_port *p, enum typec_port_type type)
4358 {
4359 struct tcpm_port *port = typec_get_drvdata(p);
4360
4361 mutex_lock(&port->lock);
4362 if (type == port->port_type)
4363 goto port_unlock;
4364
4365 port->port_type = type;
4366
4367 if (!port->connected) {
4368 tcpm_set_state(port, PORT_RESET, 0);
4369 } else if (type == TYPEC_PORT_SNK) {
4370 if (!(port->pwr_role == TYPEC_SINK &&
4371 port->data_role == TYPEC_DEVICE))
4372 tcpm_set_state(port, PORT_RESET, 0);
4373 } else if (type == TYPEC_PORT_SRC) {
4374 if (!(port->pwr_role == TYPEC_SOURCE &&
4375 port->data_role == TYPEC_HOST))
4376 tcpm_set_state(port, PORT_RESET, 0);
4377 }
4378
4379 port_unlock:
4380 mutex_unlock(&port->lock);
4381 return 0;
4382 }
4383
4384 static const struct typec_operations tcpm_ops = {
4385 .try_role = tcpm_try_role,
4386 .dr_set = tcpm_dr_set,
4387 .pr_set = tcpm_pr_set,
4388 .vconn_set = tcpm_vconn_set,
4389 .port_type_set = tcpm_port_type_set
4390 };
4391
4392 void tcpm_tcpc_reset(struct tcpm_port *port)
4393 {
4394 mutex_lock(&port->lock);
4395 /* XXX: Maintain PD connection if possible? */
4396 tcpm_init(port);
4397 mutex_unlock(&port->lock);
4398 }
4399 EXPORT_SYMBOL_GPL(tcpm_tcpc_reset);
4400
4401 static int tcpm_fw_get_caps(struct tcpm_port *port,
4402 struct fwnode_handle *fwnode)
4403 {
4404 const char *cap_str;
4405 int ret;
4406 u32 mw;
4407
4408 if (!fwnode)
4409 return -EINVAL;
4410
4411 /* USB data support is optional */
4412 ret = fwnode_property_read_string(fwnode, "data-role", &cap_str);
4413 if (ret == 0) {
4414 ret = typec_find_port_data_role(cap_str);
4415 if (ret < 0)
4416 return ret;
4417 port->typec_caps.data = ret;
4418 }
4419
4420 ret = fwnode_property_read_string(fwnode, "power-role", &cap_str);
4421 if (ret < 0)
4422 return ret;
4423
4424 ret = typec_find_port_power_role(cap_str);
4425 if (ret < 0)
4426 return ret;
4427 port->typec_caps.type = ret;
4428 port->port_type = port->typec_caps.type;
4429
4430 if (port->port_type == TYPEC_PORT_SNK)
4431 goto sink;
4432
4433 /* Get source pdos */
4434 ret = fwnode_property_count_u32(fwnode, "source-pdos");
4435 if (ret <= 0)
4436 return -EINVAL;
4437
4438 port->nr_src_pdo = min(ret, PDO_MAX_OBJECTS);
4439 ret = fwnode_property_read_u32_array(fwnode, "source-pdos",
4440 port->src_pdo, port->nr_src_pdo);
4441 if ((ret < 0) || tcpm_validate_caps(port, port->src_pdo,
4442 port->nr_src_pdo))
4443 return -EINVAL;
4444
4445 if (port->port_type == TYPEC_PORT_SRC)
4446 return 0;
4447
4448 /* Get the preferred power role for DRP */
4449 ret = fwnode_property_read_string(fwnode, "try-power-role", &cap_str);
4450 if (ret < 0)
4451 return ret;
4452
4453 port->typec_caps.prefer_role = typec_find_power_role(cap_str);
4454 if (port->typec_caps.prefer_role < 0)
4455 return -EINVAL;
4456 sink:
4457 /* Get sink pdos */
4458 ret = fwnode_property_count_u32(fwnode, "sink-pdos");
4459 if (ret <= 0)
4460 return -EINVAL;
4461
4462 port->nr_snk_pdo = min(ret, PDO_MAX_OBJECTS);
4463 ret = fwnode_property_read_u32_array(fwnode, "sink-pdos",
4464 port->snk_pdo, port->nr_snk_pdo);
4465 if ((ret < 0) || tcpm_validate_caps(port, port->snk_pdo,
4466 port->nr_snk_pdo))
4467 return -EINVAL;
4468
4469 if (fwnode_property_read_u32(fwnode, "op-sink-microwatt", &mw) < 0)
4470 return -EINVAL;
4471 port->operating_snk_mw = mw / 1000;
4472
4473 port->self_powered = fwnode_property_read_bool(fwnode, "self-powered");
4474
4475 return 0;
4476 }
4477
4478 /* Power Supply access to expose source power information */
4479 enum tcpm_psy_online_states {
4480 TCPM_PSY_OFFLINE = 0,
4481 TCPM_PSY_FIXED_ONLINE,
4482 TCPM_PSY_PROG_ONLINE,
4483 };
4484
4485 static enum power_supply_property tcpm_psy_props[] = {
4486 POWER_SUPPLY_PROP_USB_TYPE,
4487 POWER_SUPPLY_PROP_ONLINE,
4488 POWER_SUPPLY_PROP_VOLTAGE_MIN,
4489 POWER_SUPPLY_PROP_VOLTAGE_MAX,
4490 POWER_SUPPLY_PROP_VOLTAGE_NOW,
4491 POWER_SUPPLY_PROP_CURRENT_MAX,
4492 POWER_SUPPLY_PROP_CURRENT_NOW,
4493 };
4494
4495 static int tcpm_psy_get_online(struct tcpm_port *port,
4496 union power_supply_propval *val)
4497 {
4498 if (port->vbus_charge) {
4499 if (port->pps_data.active)
4500 val->intval = TCPM_PSY_PROG_ONLINE;
4501 else
4502 val->intval = TCPM_PSY_FIXED_ONLINE;
4503 } else {
4504 val->intval = TCPM_PSY_OFFLINE;
4505 }
4506
4507 return 0;
4508 }
4509
4510 static int tcpm_psy_get_voltage_min(struct tcpm_port *port,
4511 union power_supply_propval *val)
4512 {
4513 if (port->pps_data.active)
4514 val->intval = port->pps_data.min_volt * 1000;
4515 else
4516 val->intval = port->supply_voltage * 1000;
4517
4518 return 0;
4519 }
4520
4521 static int tcpm_psy_get_voltage_max(struct tcpm_port *port,
4522 union power_supply_propval *val)
4523 {
4524 if (port->pps_data.active)
4525 val->intval = port->pps_data.max_volt * 1000;
4526 else
4527 val->intval = port->supply_voltage * 1000;
4528
4529 return 0;
4530 }
4531
4532 static int tcpm_psy_get_voltage_now(struct tcpm_port *port,
4533 union power_supply_propval *val)
4534 {
4535 val->intval = port->supply_voltage * 1000;
4536
4537 return 0;
4538 }
4539
4540 static int tcpm_psy_get_current_max(struct tcpm_port *port,
4541 union power_supply_propval *val)
4542 {
4543 if (port->pps_data.active)
4544 val->intval = port->pps_data.max_curr * 1000;
4545 else
4546 val->intval = port->current_limit * 1000;
4547
4548 return 0;
4549 }
4550
4551 static int tcpm_psy_get_current_now(struct tcpm_port *port,
4552 union power_supply_propval *val)
4553 {
4554 val->intval = port->current_limit * 1000;
4555
4556 return 0;
4557 }
4558
4559 static int tcpm_psy_get_prop(struct power_supply *psy,
4560 enum power_supply_property psp,
4561 union power_supply_propval *val)
4562 {
4563 struct tcpm_port *port = power_supply_get_drvdata(psy);
4564 int ret = 0;
4565
4566 switch (psp) {
4567 case POWER_SUPPLY_PROP_USB_TYPE:
4568 val->intval = port->usb_type;
4569 break;
4570 case POWER_SUPPLY_PROP_ONLINE:
4571 ret = tcpm_psy_get_online(port, val);
4572 break;
4573 case POWER_SUPPLY_PROP_VOLTAGE_MIN:
4574 ret = tcpm_psy_get_voltage_min(port, val);
4575 break;
4576 case POWER_SUPPLY_PROP_VOLTAGE_MAX:
4577 ret = tcpm_psy_get_voltage_max(port, val);
4578 break;
4579 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
4580 ret = tcpm_psy_get_voltage_now(port, val);
4581 break;
4582 case POWER_SUPPLY_PROP_CURRENT_MAX:
4583 ret = tcpm_psy_get_current_max(port, val);
4584 break;
4585 case POWER_SUPPLY_PROP_CURRENT_NOW:
4586 ret = tcpm_psy_get_current_now(port, val);
4587 break;
4588 default:
4589 ret = -EINVAL;
4590 break;
4591 }
4592
4593 return ret;
4594 }
4595
4596 static int tcpm_psy_set_online(struct tcpm_port *port,
4597 const union power_supply_propval *val)
4598 {
4599 int ret;
4600
4601 switch (val->intval) {
4602 case TCPM_PSY_FIXED_ONLINE:
4603 ret = tcpm_pps_activate(port, false);
4604 break;
4605 case TCPM_PSY_PROG_ONLINE:
4606 ret = tcpm_pps_activate(port, true);
4607 break;
4608 default:
4609 ret = -EINVAL;
4610 break;
4611 }
4612
4613 return ret;
4614 }
4615
4616 static int tcpm_psy_set_prop(struct power_supply *psy,
4617 enum power_supply_property psp,
4618 const union power_supply_propval *val)
4619 {
4620 struct tcpm_port *port = power_supply_get_drvdata(psy);
4621 int ret;
4622
4623 switch (psp) {
4624 case POWER_SUPPLY_PROP_ONLINE:
4625 ret = tcpm_psy_set_online(port, val);
4626 break;
4627 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
4628 if (val->intval < port->pps_data.min_volt * 1000 ||
4629 val->intval > port->pps_data.max_volt * 1000)
4630 ret = -EINVAL;
4631 else
4632 ret = tcpm_pps_set_out_volt(port, val->intval / 1000);
4633 break;
4634 case POWER_SUPPLY_PROP_CURRENT_NOW:
4635 if (val->intval > port->pps_data.max_curr * 1000)
4636 ret = -EINVAL;
4637 else
4638 ret = tcpm_pps_set_op_curr(port, val->intval / 1000);
4639 break;
4640 default:
4641 ret = -EINVAL;
4642 break;
4643 }
4644
4645 return ret;
4646 }
4647
4648 static int tcpm_psy_prop_writeable(struct power_supply *psy,
4649 enum power_supply_property psp)
4650 {
4651 switch (psp) {
4652 case POWER_SUPPLY_PROP_ONLINE:
4653 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
4654 case POWER_SUPPLY_PROP_CURRENT_NOW:
4655 return 1;
4656 default:
4657 return 0;
4658 }
4659 }
4660
4661 static enum power_supply_usb_type tcpm_psy_usb_types[] = {
4662 POWER_SUPPLY_USB_TYPE_C,
4663 POWER_SUPPLY_USB_TYPE_PD,
4664 POWER_SUPPLY_USB_TYPE_PD_PPS,
4665 };
4666
4667 static const char *tcpm_psy_name_prefix = "tcpm-source-psy-";
4668
4669 static int devm_tcpm_psy_register(struct tcpm_port *port)
4670 {
4671 struct power_supply_config psy_cfg = {};
4672 const char *port_dev_name = dev_name(port->dev);
4673 size_t psy_name_len = strlen(tcpm_psy_name_prefix) +
4674 strlen(port_dev_name) + 1;
4675 char *psy_name;
4676
4677 psy_cfg.drv_data = port;
4678 psy_cfg.fwnode = dev_fwnode(port->dev);
4679 psy_name = devm_kzalloc(port->dev, psy_name_len, GFP_KERNEL);
4680 if (!psy_name)
4681 return -ENOMEM;
4682
4683 snprintf(psy_name, psy_name_len, "%s%s", tcpm_psy_name_prefix,
4684 port_dev_name);
4685 port->psy_desc.name = psy_name;
4686 port->psy_desc.type = POWER_SUPPLY_TYPE_USB,
4687 port->psy_desc.usb_types = tcpm_psy_usb_types;
4688 port->psy_desc.num_usb_types = ARRAY_SIZE(tcpm_psy_usb_types);
4689 port->psy_desc.properties = tcpm_psy_props,
4690 port->psy_desc.num_properties = ARRAY_SIZE(tcpm_psy_props),
4691 port->psy_desc.get_property = tcpm_psy_get_prop,
4692 port->psy_desc.set_property = tcpm_psy_set_prop,
4693 port->psy_desc.property_is_writeable = tcpm_psy_prop_writeable,
4694
4695 port->usb_type = POWER_SUPPLY_USB_TYPE_C;
4696
4697 port->psy = devm_power_supply_register(port->dev, &port->psy_desc,
4698 &psy_cfg);
4699
4700 return PTR_ERR_OR_ZERO(port->psy);
4701 }
4702
4703 struct tcpm_port *tcpm_register_port(struct device *dev, struct tcpc_dev *tcpc)
4704 {
4705 struct tcpm_port *port;
4706 int err;
4707
4708 if (!dev || !tcpc ||
4709 !tcpc->get_vbus || !tcpc->set_cc || !tcpc->get_cc ||
4710 !tcpc->set_polarity || !tcpc->set_vconn || !tcpc->set_vbus ||
4711 !tcpc->set_pd_rx || !tcpc->set_roles || !tcpc->pd_transmit)
4712 return ERR_PTR(-EINVAL);
4713
4714 port = devm_kzalloc(dev, sizeof(*port), GFP_KERNEL);
4715 if (!port)
4716 return ERR_PTR(-ENOMEM);
4717
4718 port->dev = dev;
4719 port->tcpc = tcpc;
4720
4721 mutex_init(&port->lock);
4722 mutex_init(&port->swap_lock);
4723
4724 port->wq = create_singlethread_workqueue(dev_name(dev));
4725 if (!port->wq)
4726 return ERR_PTR(-ENOMEM);
4727 INIT_DELAYED_WORK(&port->state_machine, tcpm_state_machine_work);
4728 INIT_DELAYED_WORK(&port->vdm_state_machine, vdm_state_machine_work);
4729 INIT_WORK(&port->event_work, tcpm_pd_event_handler);
4730
4731 spin_lock_init(&port->pd_event_lock);
4732
4733 init_completion(&port->tx_complete);
4734 init_completion(&port->swap_complete);
4735 init_completion(&port->pps_complete);
4736 tcpm_debugfs_init(port);
4737
4738 err = tcpm_fw_get_caps(port, tcpc->fwnode);
4739 if (err < 0)
4740 goto out_destroy_wq;
4741
4742 port->try_role = port->typec_caps.prefer_role;
4743
4744 port->typec_caps.fwnode = tcpc->fwnode;
4745 port->typec_caps.revision = 0x0120; /* Type-C spec release 1.2 */
4746 port->typec_caps.pd_revision = 0x0300; /* USB-PD spec release 3.0 */
4747 port->typec_caps.driver_data = port;
4748 port->typec_caps.ops = &tcpm_ops;
4749 port->typec_caps.orientation_aware = 1;
4750
4751 port->partner_desc.identity = &port->partner_ident;
4752 port->port_type = port->typec_caps.type;
4753
4754 port->role_sw = usb_role_switch_get(port->dev);
4755 if (IS_ERR(port->role_sw)) {
4756 err = PTR_ERR(port->role_sw);
4757 goto out_destroy_wq;
4758 }
4759
4760 err = devm_tcpm_psy_register(port);
4761 if (err)
4762 goto out_role_sw_put;
4763
4764 port->typec_port = typec_register_port(port->dev, &port->typec_caps);
4765 if (IS_ERR(port->typec_port)) {
4766 err = PTR_ERR(port->typec_port);
4767 goto out_role_sw_put;
4768 }
4769
4770 mutex_lock(&port->lock);
4771 tcpm_init(port);
4772 mutex_unlock(&port->lock);
4773
4774 tcpm_log(port, "%s: registered", dev_name(dev));
4775 return port;
4776
4777 out_role_sw_put:
4778 usb_role_switch_put(port->role_sw);
4779 out_destroy_wq:
4780 tcpm_debugfs_exit(port);
4781 destroy_workqueue(port->wq);
4782 return ERR_PTR(err);
4783 }
4784 EXPORT_SYMBOL_GPL(tcpm_register_port);
4785
4786 void tcpm_unregister_port(struct tcpm_port *port)
4787 {
4788 int i;
4789
4790 tcpm_reset_port(port);
4791 for (i = 0; i < ARRAY_SIZE(port->port_altmode); i++)
4792 typec_unregister_altmode(port->port_altmode[i]);
4793 typec_unregister_port(port->typec_port);
4794 usb_role_switch_put(port->role_sw);
4795 tcpm_debugfs_exit(port);
4796 destroy_workqueue(port->wq);
4797 }
4798 EXPORT_SYMBOL_GPL(tcpm_unregister_port);
4799
4800 MODULE_AUTHOR("Guenter Roeck <groeck@chromium.org>");
4801 MODULE_DESCRIPTION("USB Type-C Port Manager");
4802 MODULE_LICENSE("GPL");
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