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/hrtimer.h>
12 #include <linux/jiffies.h>
13 #include <linux/kernel.h>
14 #include <linux/kthread.h>
15 #include <linux/module.h>
16 #include <linux/mutex.h>
17 #include <linux/power_supply.h>
18 #include <linux/proc_fs.h>
19 #include <linux/property.h>
20 #include <linux/sched/clock.h>
21 #include <linux/seq_file.h>
22 #include <linux/slab.h>
23 #include <linux/spinlock.h>
24 #include <linux/usb.h>
25 #include <linux/usb/pd.h>
26 #include <linux/usb/pd_ado.h>
27 #include <linux/usb/pd_bdo.h>
28 #include <linux/usb/pd_ext_sdb.h>
29 #include <linux/usb/pd_vdo.h>
30 #include <linux/usb/role.h>
31 #include <linux/usb/tcpm.h>
32 #include <linux/usb/typec_altmode.h>
33
34 #include <uapi/linux/sched/types.h>
35
36 #define FOREACH_STATE(S) \
37 S(INVALID_STATE), \
38 S(TOGGLING), \
39 S(SRC_UNATTACHED), \
40 S(SRC_ATTACH_WAIT), \
41 S(SRC_ATTACHED), \
42 S(SRC_STARTUP), \
43 S(SRC_SEND_CAPABILITIES), \
44 S(SRC_SEND_CAPABILITIES_TIMEOUT), \
45 S(SRC_NEGOTIATE_CAPABILITIES), \
46 S(SRC_TRANSITION_SUPPLY), \
47 S(SRC_READY), \
48 S(SRC_WAIT_NEW_CAPABILITIES), \
49 \
50 S(SNK_UNATTACHED), \
51 S(SNK_ATTACH_WAIT), \
52 S(SNK_DEBOUNCED), \
53 S(SNK_ATTACHED), \
54 S(SNK_STARTUP), \
55 S(SNK_DISCOVERY), \
56 S(SNK_DISCOVERY_DEBOUNCE), \
57 S(SNK_DISCOVERY_DEBOUNCE_DONE), \
58 S(SNK_WAIT_CAPABILITIES), \
59 S(SNK_NEGOTIATE_CAPABILITIES), \
60 S(SNK_NEGOTIATE_PPS_CAPABILITIES), \
61 S(SNK_TRANSITION_SINK), \
62 S(SNK_TRANSITION_SINK_VBUS), \
63 S(SNK_READY), \
64 \
65 S(ACC_UNATTACHED), \
66 S(DEBUG_ACC_ATTACHED), \
67 S(AUDIO_ACC_ATTACHED), \
68 S(AUDIO_ACC_DEBOUNCE), \
69 \
70 S(HARD_RESET_SEND), \
71 S(HARD_RESET_START), \
72 S(SRC_HARD_RESET_VBUS_OFF), \
73 S(SRC_HARD_RESET_VBUS_ON), \
74 S(SNK_HARD_RESET_SINK_OFF), \
75 S(SNK_HARD_RESET_WAIT_VBUS), \
76 S(SNK_HARD_RESET_SINK_ON), \
77 \
78 S(SOFT_RESET), \
79 S(SOFT_RESET_SEND), \
80 \
81 S(DR_SWAP_ACCEPT), \
82 S(DR_SWAP_SEND), \
83 S(DR_SWAP_SEND_TIMEOUT), \
84 S(DR_SWAP_CANCEL), \
85 S(DR_SWAP_CHANGE_DR), \
86 \
87 S(PR_SWAP_ACCEPT), \
88 S(PR_SWAP_SEND), \
89 S(PR_SWAP_SEND_TIMEOUT), \
90 S(PR_SWAP_CANCEL), \
91 S(PR_SWAP_START), \
92 S(PR_SWAP_SRC_SNK_TRANSITION_OFF), \
93 S(PR_SWAP_SRC_SNK_SOURCE_OFF), \
94 S(PR_SWAP_SRC_SNK_SOURCE_OFF_CC_DEBOUNCED), \
95 S(PR_SWAP_SRC_SNK_SINK_ON), \
96 S(PR_SWAP_SNK_SRC_SINK_OFF), \
97 S(PR_SWAP_SNK_SRC_SOURCE_ON), \
98 S(PR_SWAP_SNK_SRC_SOURCE_ON_VBUS_RAMPED_UP), \
99 \
100 S(VCONN_SWAP_ACCEPT), \
101 S(VCONN_SWAP_SEND), \
102 S(VCONN_SWAP_SEND_TIMEOUT), \
103 S(VCONN_SWAP_CANCEL), \
104 S(VCONN_SWAP_START), \
105 S(VCONN_SWAP_WAIT_FOR_VCONN), \
106 S(VCONN_SWAP_TURN_ON_VCONN), \
107 S(VCONN_SWAP_TURN_OFF_VCONN), \
108 \
109 S(FR_SWAP_SEND), \
110 S(FR_SWAP_SEND_TIMEOUT), \
111 S(FR_SWAP_SNK_SRC_TRANSITION_TO_OFF), \
112 S(FR_SWAP_SNK_SRC_NEW_SINK_READY), \
113 S(FR_SWAP_SNK_SRC_SOURCE_VBUS_APPLIED), \
114 S(FR_SWAP_CANCEL), \
115 \
116 S(SNK_TRY), \
117 S(SNK_TRY_WAIT), \
118 S(SNK_TRY_WAIT_DEBOUNCE), \
119 S(SNK_TRY_WAIT_DEBOUNCE_CHECK_VBUS), \
120 S(SRC_TRYWAIT), \
121 S(SRC_TRYWAIT_DEBOUNCE), \
122 S(SRC_TRYWAIT_UNATTACHED), \
123 \
124 S(SRC_TRY), \
125 S(SRC_TRY_WAIT), \
126 S(SRC_TRY_DEBOUNCE), \
127 S(SNK_TRYWAIT), \
128 S(SNK_TRYWAIT_DEBOUNCE), \
129 S(SNK_TRYWAIT_VBUS), \
130 S(BIST_RX), \
131 \
132 S(GET_STATUS_SEND), \
133 S(GET_STATUS_SEND_TIMEOUT), \
134 S(GET_PPS_STATUS_SEND), \
135 S(GET_PPS_STATUS_SEND_TIMEOUT), \
136 \
137 S(GET_SINK_CAP), \
138 S(GET_SINK_CAP_TIMEOUT), \
139 \
140 S(ERROR_RECOVERY), \
141 S(PORT_RESET), \
142 S(PORT_RESET_WAIT_OFF)
143
144 #define GENERATE_ENUM(e) e
145 #define GENERATE_STRING(s) #s
146
147 enum tcpm_state {
148 FOREACH_STATE(GENERATE_ENUM)
149 };
150
151 static const char * const tcpm_states[] = {
152 FOREACH_STATE(GENERATE_STRING)
153 };
154
155 enum vdm_states {
156 VDM_STATE_ERR_BUSY = -3,
157 VDM_STATE_ERR_SEND = -2,
158 VDM_STATE_ERR_TMOUT = -1,
159 VDM_STATE_DONE = 0,
160 /* Anything >0 represents an active state */
161 VDM_STATE_READY = 1,
162 VDM_STATE_BUSY = 2,
163 VDM_STATE_WAIT_RSP_BUSY = 3,
164 };
165
166 enum pd_msg_request {
167 PD_MSG_NONE = 0,
168 PD_MSG_CTRL_REJECT,
169 PD_MSG_CTRL_WAIT,
170 PD_MSG_CTRL_NOT_SUPP,
171 PD_MSG_DATA_SINK_CAP,
172 PD_MSG_DATA_SOURCE_CAP,
173 };
174
175 enum adev_actions {
176 ADEV_NONE = 0,
177 ADEV_NOTIFY_USB_AND_QUEUE_VDM,
178 ADEV_QUEUE_VDM,
179 ADEV_QUEUE_VDM_SEND_EXIT_MODE_ON_FAIL,
180 ADEV_ATTENTION,
181 };
182
183 /*
184 * Initial current capability of the new source when vSafe5V is applied during PD3.0 Fast Role Swap.
185 * Based on "Table 6-14 Fixed Supply PDO - Sink" of "USB Power Delivery Specification Revision 3.0,
186 * Version 1.2"
187 */
188 enum frs_typec_current {
189 FRS_NOT_SUPPORTED,
190 FRS_DEFAULT_POWER,
191 FRS_5V_1P5A,
192 FRS_5V_3A,
193 };
194
195 /* Events from low level driver */
196
197 #define TCPM_CC_EVENT BIT(0)
198 #define TCPM_VBUS_EVENT BIT(1)
199 #define TCPM_RESET_EVENT BIT(2)
200 #define TCPM_FRS_EVENT BIT(3)
201 #define TCPM_SOURCING_VBUS BIT(4)
202
203 #define LOG_BUFFER_ENTRIES 1024
204 #define LOG_BUFFER_ENTRY_SIZE 128
205
206 /* Alternate mode support */
207
208 #define SVID_DISCOVERY_MAX 16
209 #define ALTMODE_DISCOVERY_MAX (SVID_DISCOVERY_MAX * MODE_DISCOVERY_MAX)
210
211 #define GET_SINK_CAP_RETRY_MS 100
212
213 struct pd_mode_data {
214 int svid_index; /* current SVID index */
215 int nsvids;
216 u16 svids[SVID_DISCOVERY_MAX];
217 int altmodes; /* number of alternate modes */
218 struct typec_altmode_desc altmode_desc[ALTMODE_DISCOVERY_MAX];
219 };
220
221 /*
222 * @min_volt: Actual min voltage at the local port
223 * @req_min_volt: Requested min voltage to the port partner
224 * @max_volt: Actual max voltage at the local port
225 * @req_max_volt: Requested max voltage to the port partner
226 * @max_curr: Actual max current at the local port
227 * @req_max_curr: Requested max current of the port partner
228 * @req_out_volt: Requested output voltage to the port partner
229 * @req_op_curr: Requested operating current to the port partner
230 * @supported: Parter has atleast one APDO hence supports PPS
231 * @active: PPS mode is active
232 */
233 struct pd_pps_data {
234 u32 min_volt;
235 u32 req_min_volt;
236 u32 max_volt;
237 u32 req_max_volt;
238 u32 max_curr;
239 u32 req_max_curr;
240 u32 req_out_volt;
241 u32 req_op_curr;
242 bool supported;
243 bool active;
244 };
245
246 struct tcpm_port {
247 struct device *dev;
248
249 struct mutex lock; /* tcpm state machine lock */
250 struct kthread_worker *wq;
251
252 struct typec_capability typec_caps;
253 struct typec_port *typec_port;
254
255 struct tcpc_dev *tcpc;
256 struct usb_role_switch *role_sw;
257
258 enum typec_role vconn_role;
259 enum typec_role pwr_role;
260 enum typec_data_role data_role;
261 enum typec_pwr_opmode pwr_opmode;
262
263 struct usb_pd_identity partner_ident;
264 struct typec_partner_desc partner_desc;
265 struct typec_partner *partner;
266
267 enum typec_cc_status cc_req;
268
269 enum typec_cc_status cc1;
270 enum typec_cc_status cc2;
271 enum typec_cc_polarity polarity;
272
273 bool attached;
274 bool connected;
275 enum typec_port_type port_type;
276 bool vbus_present;
277 bool vbus_never_low;
278 bool vbus_source;
279 bool vbus_charge;
280
281 bool send_discover;
282 bool op_vsafe5v;
283
284 int try_role;
285 int try_snk_count;
286 int try_src_count;
287
288 enum pd_msg_request queued_message;
289
290 enum tcpm_state enter_state;
291 enum tcpm_state prev_state;
292 enum tcpm_state state;
293 enum tcpm_state delayed_state;
294 ktime_t delayed_runtime;
295 unsigned long delay_ms;
296
297 spinlock_t pd_event_lock;
298 u32 pd_events;
299
300 struct kthread_work event_work;
301 struct hrtimer state_machine_timer;
302 struct kthread_work state_machine;
303 struct hrtimer vdm_state_machine_timer;
304 struct kthread_work vdm_state_machine;
305 struct hrtimer enable_frs_timer;
306 struct kthread_work enable_frs;
307 bool state_machine_running;
308
309 struct completion tx_complete;
310 enum tcpm_transmit_status tx_status;
311
312 struct mutex swap_lock; /* swap command lock */
313 bool swap_pending;
314 bool non_pd_role_swap;
315 struct completion swap_complete;
316 int swap_status;
317
318 unsigned int negotiated_rev;
319 unsigned int message_id;
320 unsigned int caps_count;
321 unsigned int hard_reset_count;
322 bool pd_capable;
323 bool explicit_contract;
324 unsigned int rx_msgid;
325
326 /* Partner capabilities/requests */
327 u32 sink_request;
328 u32 source_caps[PDO_MAX_OBJECTS];
329 unsigned int nr_source_caps;
330 u32 sink_caps[PDO_MAX_OBJECTS];
331 unsigned int nr_sink_caps;
332
333 /* Local capabilities */
334 u32 src_pdo[PDO_MAX_OBJECTS];
335 unsigned int nr_src_pdo;
336 u32 snk_pdo[PDO_MAX_OBJECTS];
337 unsigned int nr_snk_pdo;
338 u32 snk_vdo[VDO_MAX_OBJECTS];
339 unsigned int nr_snk_vdo;
340
341 unsigned int operating_snk_mw;
342 bool update_sink_caps;
343
344 /* Requested current / voltage to the port partner */
345 u32 req_current_limit;
346 u32 req_supply_voltage;
347 /* Actual current / voltage limit of the local port */
348 u32 current_limit;
349 u32 supply_voltage;
350
351 /* Used to export TA voltage and current */
352 struct power_supply *psy;
353 struct power_supply_desc psy_desc;
354 enum power_supply_usb_type usb_type;
355
356 u32 bist_request;
357
358 /* PD state for Vendor Defined Messages */
359 enum vdm_states vdm_state;
360 u32 vdm_retries;
361 /* next Vendor Defined Message to send */
362 u32 vdo_data[VDO_MAX_SIZE];
363 u8 vdo_count;
364 /* VDO to retry if UFP responder replied busy */
365 u32 vdo_retry;
366
367 /* PPS */
368 struct pd_pps_data pps_data;
369 struct completion pps_complete;
370 bool pps_pending;
371 int pps_status;
372
373 /* Alternate mode data */
374 struct pd_mode_data mode_data;
375 struct typec_altmode *partner_altmode[ALTMODE_DISCOVERY_MAX];
376 struct typec_altmode *port_altmode[ALTMODE_DISCOVERY_MAX];
377
378 /* Deadline in jiffies to exit src_try_wait state */
379 unsigned long max_wait;
380
381 /* port belongs to a self powered device */
382 bool self_powered;
383
384 /* FRS */
385 enum frs_typec_current frs_current;
386
387 /* Sink caps have been queried */
388 bool sink_cap_done;
389
390 #ifdef CONFIG_DEBUG_FS
391 struct dentry *dentry;
392 struct mutex logbuffer_lock; /* log buffer access lock */
393 int logbuffer_head;
394 int logbuffer_tail;
395 u8 *logbuffer[LOG_BUFFER_ENTRIES];
396 #endif
397 };
398
399 struct pd_rx_event {
400 struct kthread_work work;
401 struct tcpm_port *port;
402 struct pd_message msg;
403 };
404
405 #define tcpm_cc_is_sink(cc) \
406 ((cc) == TYPEC_CC_RP_DEF || (cc) == TYPEC_CC_RP_1_5 || \
407 (cc) == TYPEC_CC_RP_3_0)
408
409 #define tcpm_port_is_sink(port) \
410 ((tcpm_cc_is_sink((port)->cc1) && !tcpm_cc_is_sink((port)->cc2)) || \
411 (tcpm_cc_is_sink((port)->cc2) && !tcpm_cc_is_sink((port)->cc1)))
412
413 #define tcpm_cc_is_source(cc) ((cc) == TYPEC_CC_RD)
414 #define tcpm_cc_is_audio(cc) ((cc) == TYPEC_CC_RA)
415 #define tcpm_cc_is_open(cc) ((cc) == TYPEC_CC_OPEN)
416
417 #define tcpm_port_is_source(port) \
418 ((tcpm_cc_is_source((port)->cc1) && \
419 !tcpm_cc_is_source((port)->cc2)) || \
420 (tcpm_cc_is_source((port)->cc2) && \
421 !tcpm_cc_is_source((port)->cc1)))
422
423 #define tcpm_port_is_debug(port) \
424 (tcpm_cc_is_source((port)->cc1) && tcpm_cc_is_source((port)->cc2))
425
426 #define tcpm_port_is_audio(port) \
427 (tcpm_cc_is_audio((port)->cc1) && tcpm_cc_is_audio((port)->cc2))
428
429 #define tcpm_port_is_audio_detached(port) \
430 ((tcpm_cc_is_audio((port)->cc1) && tcpm_cc_is_open((port)->cc2)) || \
431 (tcpm_cc_is_audio((port)->cc2) && tcpm_cc_is_open((port)->cc1)))
432
433 #define tcpm_try_snk(port) \
434 ((port)->try_snk_count == 0 && (port)->try_role == TYPEC_SINK && \
435 (port)->port_type == TYPEC_PORT_DRP)
436
437 #define tcpm_try_src(port) \
438 ((port)->try_src_count == 0 && (port)->try_role == TYPEC_SOURCE && \
439 (port)->port_type == TYPEC_PORT_DRP)
440
441 #define tcpm_data_role_for_source(port) \
442 ((port)->typec_caps.data == TYPEC_PORT_UFP ? \
443 TYPEC_DEVICE : TYPEC_HOST)
444
445 #define tcpm_data_role_for_sink(port) \
446 ((port)->typec_caps.data == TYPEC_PORT_DFP ? \
447 TYPEC_HOST : TYPEC_DEVICE)
448
tcpm_default_state(struct tcpm_port * port)449 static enum tcpm_state tcpm_default_state(struct tcpm_port *port)
450 {
451 if (port->port_type == TYPEC_PORT_DRP) {
452 if (port->try_role == TYPEC_SINK)
453 return SNK_UNATTACHED;
454 else if (port->try_role == TYPEC_SOURCE)
455 return SRC_UNATTACHED;
456 /* Fall through to return SRC_UNATTACHED */
457 } else if (port->port_type == TYPEC_PORT_SNK) {
458 return SNK_UNATTACHED;
459 }
460 return SRC_UNATTACHED;
461 }
462
tcpm_port_is_disconnected(struct tcpm_port * port)463 static bool tcpm_port_is_disconnected(struct tcpm_port *port)
464 {
465 return (!port->attached && port->cc1 == TYPEC_CC_OPEN &&
466 port->cc2 == TYPEC_CC_OPEN) ||
467 (port->attached && ((port->polarity == TYPEC_POLARITY_CC1 &&
468 port->cc1 == TYPEC_CC_OPEN) ||
469 (port->polarity == TYPEC_POLARITY_CC2 &&
470 port->cc2 == TYPEC_CC_OPEN)));
471 }
472
473 /*
474 * Logging
475 */
476
477 #ifdef CONFIG_DEBUG_FS
478
tcpm_log_full(struct tcpm_port * port)479 static bool tcpm_log_full(struct tcpm_port *port)
480 {
481 return port->logbuffer_tail ==
482 (port->logbuffer_head + 1) % LOG_BUFFER_ENTRIES;
483 }
484
485 __printf(2, 0)
_tcpm_log(struct tcpm_port * port,const char * fmt,va_list args)486 static void _tcpm_log(struct tcpm_port *port, const char *fmt, va_list args)
487 {
488 char tmpbuffer[LOG_BUFFER_ENTRY_SIZE];
489 u64 ts_nsec = local_clock();
490 unsigned long rem_nsec;
491
492 mutex_lock(&port->logbuffer_lock);
493 if (!port->logbuffer[port->logbuffer_head]) {
494 port->logbuffer[port->logbuffer_head] =
495 kzalloc(LOG_BUFFER_ENTRY_SIZE, GFP_KERNEL);
496 if (!port->logbuffer[port->logbuffer_head]) {
497 mutex_unlock(&port->logbuffer_lock);
498 return;
499 }
500 }
501
502 vsnprintf(tmpbuffer, sizeof(tmpbuffer), fmt, args);
503
504 if (tcpm_log_full(port)) {
505 port->logbuffer_head = max(port->logbuffer_head - 1, 0);
506 strcpy(tmpbuffer, "overflow");
507 }
508
509 if (port->logbuffer_head < 0 ||
510 port->logbuffer_head >= LOG_BUFFER_ENTRIES) {
511 dev_warn(port->dev,
512 "Bad log buffer index %d\n", port->logbuffer_head);
513 goto abort;
514 }
515
516 if (!port->logbuffer[port->logbuffer_head]) {
517 dev_warn(port->dev,
518 "Log buffer index %d is NULL\n", port->logbuffer_head);
519 goto abort;
520 }
521
522 rem_nsec = do_div(ts_nsec, 1000000000);
523 scnprintf(port->logbuffer[port->logbuffer_head],
524 LOG_BUFFER_ENTRY_SIZE, "[%5lu.%06lu] %s",
525 (unsigned long)ts_nsec, rem_nsec / 1000,
526 tmpbuffer);
527 port->logbuffer_head = (port->logbuffer_head + 1) % LOG_BUFFER_ENTRIES;
528
529 abort:
530 mutex_unlock(&port->logbuffer_lock);
531 }
532
533 __printf(2, 3)
tcpm_log(struct tcpm_port * port,const char * fmt,...)534 static void tcpm_log(struct tcpm_port *port, const char *fmt, ...)
535 {
536 va_list args;
537
538 /* Do not log while disconnected and unattached */
539 if (tcpm_port_is_disconnected(port) &&
540 (port->state == SRC_UNATTACHED || port->state == SNK_UNATTACHED ||
541 port->state == TOGGLING))
542 return;
543
544 va_start(args, fmt);
545 _tcpm_log(port, fmt, args);
546 va_end(args);
547 }
548
549 __printf(2, 3)
tcpm_log_force(struct tcpm_port * port,const char * fmt,...)550 static void tcpm_log_force(struct tcpm_port *port, const char *fmt, ...)
551 {
552 va_list args;
553
554 va_start(args, fmt);
555 _tcpm_log(port, fmt, args);
556 va_end(args);
557 }
558
tcpm_log_source_caps(struct tcpm_port * port)559 static void tcpm_log_source_caps(struct tcpm_port *port)
560 {
561 int i;
562
563 for (i = 0; i < port->nr_source_caps; i++) {
564 u32 pdo = port->source_caps[i];
565 enum pd_pdo_type type = pdo_type(pdo);
566 char msg[64];
567
568 switch (type) {
569 case PDO_TYPE_FIXED:
570 scnprintf(msg, sizeof(msg),
571 "%u mV, %u mA [%s%s%s%s%s%s]",
572 pdo_fixed_voltage(pdo),
573 pdo_max_current(pdo),
574 (pdo & PDO_FIXED_DUAL_ROLE) ?
575 "R" : "",
576 (pdo & PDO_FIXED_SUSPEND) ?
577 "S" : "",
578 (pdo & PDO_FIXED_HIGHER_CAP) ?
579 "H" : "",
580 (pdo & PDO_FIXED_USB_COMM) ?
581 "U" : "",
582 (pdo & PDO_FIXED_DATA_SWAP) ?
583 "D" : "",
584 (pdo & PDO_FIXED_EXTPOWER) ?
585 "E" : "");
586 break;
587 case PDO_TYPE_VAR:
588 scnprintf(msg, sizeof(msg),
589 "%u-%u mV, %u mA",
590 pdo_min_voltage(pdo),
591 pdo_max_voltage(pdo),
592 pdo_max_current(pdo));
593 break;
594 case PDO_TYPE_BATT:
595 scnprintf(msg, sizeof(msg),
596 "%u-%u mV, %u mW",
597 pdo_min_voltage(pdo),
598 pdo_max_voltage(pdo),
599 pdo_max_power(pdo));
600 break;
601 case PDO_TYPE_APDO:
602 if (pdo_apdo_type(pdo) == APDO_TYPE_PPS)
603 scnprintf(msg, sizeof(msg),
604 "%u-%u mV, %u mA",
605 pdo_pps_apdo_min_voltage(pdo),
606 pdo_pps_apdo_max_voltage(pdo),
607 pdo_pps_apdo_max_current(pdo));
608 else
609 strcpy(msg, "undefined APDO");
610 break;
611 default:
612 strcpy(msg, "undefined");
613 break;
614 }
615 tcpm_log(port, " PDO %d: type %d, %s",
616 i, type, msg);
617 }
618 }
619
tcpm_debug_show(struct seq_file * s,void * v)620 static int tcpm_debug_show(struct seq_file *s, void *v)
621 {
622 struct tcpm_port *port = (struct tcpm_port *)s->private;
623 int tail;
624
625 mutex_lock(&port->logbuffer_lock);
626 tail = port->logbuffer_tail;
627 while (tail != port->logbuffer_head) {
628 seq_printf(s, "%s\n", port->logbuffer[tail]);
629 tail = (tail + 1) % LOG_BUFFER_ENTRIES;
630 }
631 if (!seq_has_overflowed(s))
632 port->logbuffer_tail = tail;
633 mutex_unlock(&port->logbuffer_lock);
634
635 return 0;
636 }
637 DEFINE_SHOW_ATTRIBUTE(tcpm_debug);
638
tcpm_debugfs_init(struct tcpm_port * port)639 static void tcpm_debugfs_init(struct tcpm_port *port)
640 {
641 char name[NAME_MAX];
642
643 mutex_init(&port->logbuffer_lock);
644 snprintf(name, NAME_MAX, "tcpm-%s", dev_name(port->dev));
645 port->dentry = debugfs_create_file(name, S_IFREG | 0444, usb_debug_root,
646 port, &tcpm_debug_fops);
647 }
648
tcpm_debugfs_exit(struct tcpm_port * port)649 static void tcpm_debugfs_exit(struct tcpm_port *port)
650 {
651 int i;
652
653 mutex_lock(&port->logbuffer_lock);
654 for (i = 0; i < LOG_BUFFER_ENTRIES; i++) {
655 kfree(port->logbuffer[i]);
656 port->logbuffer[i] = NULL;
657 }
658 mutex_unlock(&port->logbuffer_lock);
659
660 debugfs_remove(port->dentry);
661 }
662
663 #else
664
665 __printf(2, 3)
tcpm_log(const struct tcpm_port * port,const char * fmt,...)666 static void tcpm_log(const struct tcpm_port *port, const char *fmt, ...) { }
667 __printf(2, 3)
tcpm_log_force(struct tcpm_port * port,const char * fmt,...)668 static void tcpm_log_force(struct tcpm_port *port, const char *fmt, ...) { }
tcpm_log_source_caps(struct tcpm_port * port)669 static void tcpm_log_source_caps(struct tcpm_port *port) { }
tcpm_debugfs_init(const struct tcpm_port * port)670 static void tcpm_debugfs_init(const struct tcpm_port *port) { }
tcpm_debugfs_exit(const struct tcpm_port * port)671 static void tcpm_debugfs_exit(const struct tcpm_port *port) { }
672
673 #endif
674
tcpm_pd_transmit(struct tcpm_port * port,enum tcpm_transmit_type type,const struct pd_message * msg)675 static int tcpm_pd_transmit(struct tcpm_port *port,
676 enum tcpm_transmit_type type,
677 const struct pd_message *msg)
678 {
679 unsigned long timeout;
680 int ret;
681
682 if (msg)
683 tcpm_log(port, "PD TX, header: %#x", le16_to_cpu(msg->header));
684 else
685 tcpm_log(port, "PD TX, type: %#x", type);
686
687 reinit_completion(&port->tx_complete);
688 ret = port->tcpc->pd_transmit(port->tcpc, type, msg);
689 if (ret < 0)
690 return ret;
691
692 mutex_unlock(&port->lock);
693 timeout = wait_for_completion_timeout(&port->tx_complete,
694 msecs_to_jiffies(PD_T_TCPC_TX_TIMEOUT));
695 mutex_lock(&port->lock);
696 if (!timeout)
697 return -ETIMEDOUT;
698
699 switch (port->tx_status) {
700 case TCPC_TX_SUCCESS:
701 port->message_id = (port->message_id + 1) & PD_HEADER_ID_MASK;
702 return 0;
703 case TCPC_TX_DISCARDED:
704 return -EAGAIN;
705 case TCPC_TX_FAILED:
706 default:
707 return -EIO;
708 }
709 }
710
tcpm_pd_transmit_complete(struct tcpm_port * port,enum tcpm_transmit_status status)711 void tcpm_pd_transmit_complete(struct tcpm_port *port,
712 enum tcpm_transmit_status status)
713 {
714 tcpm_log(port, "PD TX complete, status: %u", status);
715 port->tx_status = status;
716 complete(&port->tx_complete);
717 }
718 EXPORT_SYMBOL_GPL(tcpm_pd_transmit_complete);
719
tcpm_mux_set(struct tcpm_port * port,int state,enum usb_role usb_role,enum typec_orientation orientation)720 static int tcpm_mux_set(struct tcpm_port *port, int state,
721 enum usb_role usb_role,
722 enum typec_orientation orientation)
723 {
724 int ret;
725
726 tcpm_log(port, "Requesting mux state %d, usb-role %d, orientation %d",
727 state, usb_role, orientation);
728
729 ret = typec_set_orientation(port->typec_port, orientation);
730 if (ret)
731 return ret;
732
733 if (port->role_sw) {
734 ret = usb_role_switch_set_role(port->role_sw, usb_role);
735 if (ret)
736 return ret;
737 }
738
739 return typec_set_mode(port->typec_port, state);
740 }
741
tcpm_set_polarity(struct tcpm_port * port,enum typec_cc_polarity polarity)742 static int tcpm_set_polarity(struct tcpm_port *port,
743 enum typec_cc_polarity polarity)
744 {
745 int ret;
746
747 tcpm_log(port, "polarity %d", polarity);
748
749 ret = port->tcpc->set_polarity(port->tcpc, polarity);
750 if (ret < 0)
751 return ret;
752
753 port->polarity = polarity;
754
755 return 0;
756 }
757
tcpm_set_vconn(struct tcpm_port * port,bool enable)758 static int tcpm_set_vconn(struct tcpm_port *port, bool enable)
759 {
760 int ret;
761
762 tcpm_log(port, "vconn:=%d", enable);
763
764 ret = port->tcpc->set_vconn(port->tcpc, enable);
765 if (!ret) {
766 port->vconn_role = enable ? TYPEC_SOURCE : TYPEC_SINK;
767 typec_set_vconn_role(port->typec_port, port->vconn_role);
768 }
769
770 return ret;
771 }
772
tcpm_get_current_limit(struct tcpm_port * port)773 static u32 tcpm_get_current_limit(struct tcpm_port *port)
774 {
775 enum typec_cc_status cc;
776 u32 limit;
777
778 cc = port->polarity ? port->cc2 : port->cc1;
779 switch (cc) {
780 case TYPEC_CC_RP_1_5:
781 limit = 1500;
782 break;
783 case TYPEC_CC_RP_3_0:
784 limit = 3000;
785 break;
786 case TYPEC_CC_RP_DEF:
787 default:
788 if (port->tcpc->get_current_limit)
789 limit = port->tcpc->get_current_limit(port->tcpc);
790 else
791 limit = 0;
792 break;
793 }
794
795 return limit;
796 }
797
tcpm_set_current_limit(struct tcpm_port * port,u32 max_ma,u32 mv)798 static int tcpm_set_current_limit(struct tcpm_port *port, u32 max_ma, u32 mv)
799 {
800 int ret = -EOPNOTSUPP;
801
802 tcpm_log(port, "Setting voltage/current limit %u mV %u mA", mv, max_ma);
803
804 port->supply_voltage = mv;
805 port->current_limit = max_ma;
806 power_supply_changed(port->psy);
807
808 if (port->tcpc->set_current_limit)
809 ret = port->tcpc->set_current_limit(port->tcpc, max_ma, mv);
810
811 return ret;
812 }
813
814 /*
815 * Determine RP value to set based on maximum current supported
816 * by a port if configured as source.
817 * Returns CC value to report to link partner.
818 */
tcpm_rp_cc(struct tcpm_port * port)819 static enum typec_cc_status tcpm_rp_cc(struct tcpm_port *port)
820 {
821 const u32 *src_pdo = port->src_pdo;
822 int nr_pdo = port->nr_src_pdo;
823 int i;
824
825 /*
826 * Search for first entry with matching voltage.
827 * It should report the maximum supported current.
828 */
829 for (i = 0; i < nr_pdo; i++) {
830 const u32 pdo = src_pdo[i];
831
832 if (pdo_type(pdo) == PDO_TYPE_FIXED &&
833 pdo_fixed_voltage(pdo) == 5000) {
834 unsigned int curr = pdo_max_current(pdo);
835
836 if (curr >= 3000)
837 return TYPEC_CC_RP_3_0;
838 else if (curr >= 1500)
839 return TYPEC_CC_RP_1_5;
840 return TYPEC_CC_RP_DEF;
841 }
842 }
843
844 return TYPEC_CC_RP_DEF;
845 }
846
tcpm_set_attached_state(struct tcpm_port * port,bool attached)847 static int tcpm_set_attached_state(struct tcpm_port *port, bool attached)
848 {
849 return port->tcpc->set_roles(port->tcpc, attached, port->pwr_role,
850 port->data_role);
851 }
852
tcpm_set_roles(struct tcpm_port * port,bool attached,enum typec_role role,enum typec_data_role data)853 static int tcpm_set_roles(struct tcpm_port *port, bool attached,
854 enum typec_role role, enum typec_data_role data)
855 {
856 enum typec_orientation orientation;
857 enum usb_role usb_role;
858 int ret;
859
860 if (port->polarity == TYPEC_POLARITY_CC1)
861 orientation = TYPEC_ORIENTATION_NORMAL;
862 else
863 orientation = TYPEC_ORIENTATION_REVERSE;
864
865 if (port->typec_caps.data == TYPEC_PORT_DRD) {
866 if (data == TYPEC_HOST)
867 usb_role = USB_ROLE_HOST;
868 else
869 usb_role = USB_ROLE_DEVICE;
870 } else if (port->typec_caps.data == TYPEC_PORT_DFP) {
871 if (data == TYPEC_HOST) {
872 if (role == TYPEC_SOURCE)
873 usb_role = USB_ROLE_HOST;
874 else
875 usb_role = USB_ROLE_NONE;
876 } else {
877 return -ENOTSUPP;
878 }
879 } else {
880 if (data == TYPEC_DEVICE) {
881 if (role == TYPEC_SINK)
882 usb_role = USB_ROLE_DEVICE;
883 else
884 usb_role = USB_ROLE_NONE;
885 } else {
886 return -ENOTSUPP;
887 }
888 }
889
890 ret = tcpm_mux_set(port, TYPEC_STATE_USB, usb_role, orientation);
891 if (ret < 0)
892 return ret;
893
894 ret = port->tcpc->set_roles(port->tcpc, attached, role, data);
895 if (ret < 0)
896 return ret;
897
898 port->pwr_role = role;
899 port->data_role = data;
900 typec_set_data_role(port->typec_port, data);
901 typec_set_pwr_role(port->typec_port, role);
902
903 return 0;
904 }
905
tcpm_set_pwr_role(struct tcpm_port * port,enum typec_role role)906 static int tcpm_set_pwr_role(struct tcpm_port *port, enum typec_role role)
907 {
908 int ret;
909
910 ret = port->tcpc->set_roles(port->tcpc, true, role,
911 port->data_role);
912 if (ret < 0)
913 return ret;
914
915 port->pwr_role = role;
916 typec_set_pwr_role(port->typec_port, role);
917
918 return 0;
919 }
920
tcpm_pd_send_source_caps(struct tcpm_port * port)921 static int tcpm_pd_send_source_caps(struct tcpm_port *port)
922 {
923 struct pd_message msg;
924 int i;
925
926 memset(&msg, 0, sizeof(msg));
927 if (!port->nr_src_pdo) {
928 /* No source capabilities defined, sink only */
929 msg.header = PD_HEADER_LE(PD_CTRL_REJECT,
930 port->pwr_role,
931 port->data_role,
932 port->negotiated_rev,
933 port->message_id, 0);
934 } else {
935 msg.header = PD_HEADER_LE(PD_DATA_SOURCE_CAP,
936 port->pwr_role,
937 port->data_role,
938 port->negotiated_rev,
939 port->message_id,
940 port->nr_src_pdo);
941 }
942 for (i = 0; i < port->nr_src_pdo; i++)
943 msg.payload[i] = cpu_to_le32(port->src_pdo[i]);
944
945 return tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
946 }
947
tcpm_pd_send_sink_caps(struct tcpm_port * port)948 static int tcpm_pd_send_sink_caps(struct tcpm_port *port)
949 {
950 struct pd_message msg;
951 int i;
952
953 memset(&msg, 0, sizeof(msg));
954 if (!port->nr_snk_pdo) {
955 /* No sink capabilities defined, source only */
956 msg.header = PD_HEADER_LE(PD_CTRL_REJECT,
957 port->pwr_role,
958 port->data_role,
959 port->negotiated_rev,
960 port->message_id, 0);
961 } else {
962 msg.header = PD_HEADER_LE(PD_DATA_SINK_CAP,
963 port->pwr_role,
964 port->data_role,
965 port->negotiated_rev,
966 port->message_id,
967 port->nr_snk_pdo);
968 }
969 for (i = 0; i < port->nr_snk_pdo; i++)
970 msg.payload[i] = cpu_to_le32(port->snk_pdo[i]);
971
972 return tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
973 }
974
mod_tcpm_delayed_work(struct tcpm_port * port,unsigned int delay_ms)975 static void mod_tcpm_delayed_work(struct tcpm_port *port, unsigned int delay_ms)
976 {
977 if (delay_ms) {
978 hrtimer_start(&port->state_machine_timer, ms_to_ktime(delay_ms), HRTIMER_MODE_REL);
979 } else {
980 hrtimer_cancel(&port->state_machine_timer);
981 kthread_queue_work(port->wq, &port->state_machine);
982 }
983 }
984
mod_vdm_delayed_work(struct tcpm_port * port,unsigned int delay_ms)985 static void mod_vdm_delayed_work(struct tcpm_port *port, unsigned int delay_ms)
986 {
987 if (delay_ms) {
988 hrtimer_start(&port->vdm_state_machine_timer, ms_to_ktime(delay_ms),
989 HRTIMER_MODE_REL);
990 } else {
991 hrtimer_cancel(&port->vdm_state_machine_timer);
992 kthread_queue_work(port->wq, &port->vdm_state_machine);
993 }
994 }
995
mod_enable_frs_delayed_work(struct tcpm_port * port,unsigned int delay_ms)996 static void mod_enable_frs_delayed_work(struct tcpm_port *port, unsigned int delay_ms)
997 {
998 if (delay_ms) {
999 hrtimer_start(&port->enable_frs_timer, ms_to_ktime(delay_ms), HRTIMER_MODE_REL);
1000 } else {
1001 hrtimer_cancel(&port->enable_frs_timer);
1002 kthread_queue_work(port->wq, &port->enable_frs);
1003 }
1004 }
1005
tcpm_set_state(struct tcpm_port * port,enum tcpm_state state,unsigned int delay_ms)1006 static void tcpm_set_state(struct tcpm_port *port, enum tcpm_state state,
1007 unsigned int delay_ms)
1008 {
1009 if (delay_ms) {
1010 tcpm_log(port, "pending state change %s -> %s @ %u ms",
1011 tcpm_states[port->state], tcpm_states[state],
1012 delay_ms);
1013 port->delayed_state = state;
1014 mod_tcpm_delayed_work(port, delay_ms);
1015 port->delayed_runtime = ktime_add(ktime_get(), ms_to_ktime(delay_ms));
1016 port->delay_ms = delay_ms;
1017 } else {
1018 tcpm_log(port, "state change %s -> %s",
1019 tcpm_states[port->state], tcpm_states[state]);
1020 port->delayed_state = INVALID_STATE;
1021 port->prev_state = port->state;
1022 port->state = state;
1023 /*
1024 * Don't re-queue the state machine work item if we're currently
1025 * in the state machine and we're immediately changing states.
1026 * tcpm_state_machine_work() will continue running the state
1027 * machine.
1028 */
1029 if (!port->state_machine_running)
1030 mod_tcpm_delayed_work(port, 0);
1031 }
1032 }
1033
tcpm_set_state_cond(struct tcpm_port * port,enum tcpm_state state,unsigned int delay_ms)1034 static void tcpm_set_state_cond(struct tcpm_port *port, enum tcpm_state state,
1035 unsigned int delay_ms)
1036 {
1037 if (port->enter_state == port->state)
1038 tcpm_set_state(port, state, delay_ms);
1039 else
1040 tcpm_log(port,
1041 "skipped %sstate change %s -> %s [%u ms], context state %s",
1042 delay_ms ? "delayed " : "",
1043 tcpm_states[port->state], tcpm_states[state],
1044 delay_ms, tcpm_states[port->enter_state]);
1045 }
1046
tcpm_queue_message(struct tcpm_port * port,enum pd_msg_request message)1047 static void tcpm_queue_message(struct tcpm_port *port,
1048 enum pd_msg_request message)
1049 {
1050 port->queued_message = message;
1051 mod_tcpm_delayed_work(port, 0);
1052 }
1053
1054 /*
1055 * VDM/VDO handling functions
1056 */
tcpm_queue_vdm(struct tcpm_port * port,const u32 header,const u32 * data,int cnt)1057 static void tcpm_queue_vdm(struct tcpm_port *port, const u32 header,
1058 const u32 *data, int cnt)
1059 {
1060 WARN_ON(!mutex_is_locked(&port->lock));
1061
1062 /* Make sure we are not still processing a previous VDM packet */
1063 WARN_ON(port->vdm_state > VDM_STATE_DONE);
1064
1065 port->vdo_count = cnt + 1;
1066 port->vdo_data[0] = header;
1067 memcpy(&port->vdo_data[1], data, sizeof(u32) * cnt);
1068 /* Set ready, vdm state machine will actually send */
1069 port->vdm_retries = 0;
1070 port->vdm_state = VDM_STATE_READY;
1071
1072 mod_vdm_delayed_work(port, 0);
1073 }
1074
tcpm_queue_vdm_unlocked(struct tcpm_port * port,const u32 header,const u32 * data,int cnt)1075 static void tcpm_queue_vdm_unlocked(struct tcpm_port *port, const u32 header,
1076 const u32 *data, int cnt)
1077 {
1078 mutex_lock(&port->lock);
1079 tcpm_queue_vdm(port, header, data, cnt);
1080 mutex_unlock(&port->lock);
1081 }
1082
svdm_consume_identity(struct tcpm_port * port,const u32 * p,int cnt)1083 static void svdm_consume_identity(struct tcpm_port *port, const u32 *p, int cnt)
1084 {
1085 u32 vdo = p[VDO_INDEX_IDH];
1086 u32 product = p[VDO_INDEX_PRODUCT];
1087
1088 memset(&port->mode_data, 0, sizeof(port->mode_data));
1089
1090 port->partner_ident.id_header = vdo;
1091 port->partner_ident.cert_stat = p[VDO_INDEX_CSTAT];
1092 port->partner_ident.product = product;
1093
1094 typec_partner_set_identity(port->partner);
1095
1096 tcpm_log(port, "Identity: %04x:%04x.%04x",
1097 PD_IDH_VID(vdo),
1098 PD_PRODUCT_PID(product), product & 0xffff);
1099 }
1100
svdm_consume_svids(struct tcpm_port * port,const u32 * p,int cnt)1101 static bool svdm_consume_svids(struct tcpm_port *port, const u32 *p, int cnt)
1102 {
1103 struct pd_mode_data *pmdata = &port->mode_data;
1104 int i;
1105
1106 for (i = 1; i < cnt; i++) {
1107 u16 svid;
1108
1109 svid = (p[i] >> 16) & 0xffff;
1110 if (!svid)
1111 return false;
1112
1113 if (pmdata->nsvids >= SVID_DISCOVERY_MAX)
1114 goto abort;
1115
1116 pmdata->svids[pmdata->nsvids++] = svid;
1117 tcpm_log(port, "SVID %d: 0x%x", pmdata->nsvids, svid);
1118
1119 svid = p[i] & 0xffff;
1120 if (!svid)
1121 return false;
1122
1123 if (pmdata->nsvids >= SVID_DISCOVERY_MAX)
1124 goto abort;
1125
1126 pmdata->svids[pmdata->nsvids++] = svid;
1127 tcpm_log(port, "SVID %d: 0x%x", pmdata->nsvids, svid);
1128 }
1129 return true;
1130 abort:
1131 tcpm_log(port, "SVID_DISCOVERY_MAX(%d) too low!", SVID_DISCOVERY_MAX);
1132 return false;
1133 }
1134
svdm_consume_modes(struct tcpm_port * port,const u32 * p,int cnt)1135 static void svdm_consume_modes(struct tcpm_port *port, const u32 *p, int cnt)
1136 {
1137 struct pd_mode_data *pmdata = &port->mode_data;
1138 struct typec_altmode_desc *paltmode;
1139 int i;
1140
1141 if (pmdata->altmodes >= ARRAY_SIZE(port->partner_altmode)) {
1142 /* Already logged in svdm_consume_svids() */
1143 return;
1144 }
1145
1146 for (i = 1; i < cnt; i++) {
1147 paltmode = &pmdata->altmode_desc[pmdata->altmodes];
1148 memset(paltmode, 0, sizeof(*paltmode));
1149
1150 paltmode->svid = pmdata->svids[pmdata->svid_index];
1151 paltmode->mode = i;
1152 paltmode->vdo = p[i];
1153
1154 tcpm_log(port, " Alternate mode %d: SVID 0x%04x, VDO %d: 0x%08x",
1155 pmdata->altmodes, paltmode->svid,
1156 paltmode->mode, paltmode->vdo);
1157
1158 pmdata->altmodes++;
1159 }
1160 }
1161
tcpm_register_partner_altmodes(struct tcpm_port * port)1162 static void tcpm_register_partner_altmodes(struct tcpm_port *port)
1163 {
1164 struct pd_mode_data *modep = &port->mode_data;
1165 struct typec_altmode *altmode;
1166 int i;
1167
1168 for (i = 0; i < modep->altmodes; i++) {
1169 altmode = typec_partner_register_altmode(port->partner,
1170 &modep->altmode_desc[i]);
1171 if (IS_ERR(altmode)) {
1172 tcpm_log(port, "Failed to register partner SVID 0x%04x",
1173 modep->altmode_desc[i].svid);
1174 altmode = NULL;
1175 }
1176 port->partner_altmode[i] = altmode;
1177 }
1178 }
1179
1180 #define supports_modal(port) PD_IDH_MODAL_SUPP((port)->partner_ident.id_header)
1181
tcpm_pd_svdm(struct tcpm_port * port,struct typec_altmode * adev,const u32 * p,int cnt,u32 * response,enum adev_actions * adev_action)1182 static int tcpm_pd_svdm(struct tcpm_port *port, struct typec_altmode *adev,
1183 const u32 *p, int cnt, u32 *response,
1184 enum adev_actions *adev_action)
1185 {
1186 struct typec_altmode *pdev;
1187 struct pd_mode_data *modep;
1188 int rlen = 0;
1189 int cmd_type;
1190 int cmd;
1191 int i;
1192
1193 cmd_type = PD_VDO_CMDT(p[0]);
1194 cmd = PD_VDO_CMD(p[0]);
1195
1196 tcpm_log(port, "Rx VDM cmd 0x%x type %d cmd %d len %d",
1197 p[0], cmd_type, cmd, cnt);
1198
1199 modep = &port->mode_data;
1200
1201 pdev = typec_match_altmode(port->partner_altmode, ALTMODE_DISCOVERY_MAX,
1202 PD_VDO_VID(p[0]), PD_VDO_OPOS(p[0]));
1203
1204 switch (cmd_type) {
1205 case CMDT_INIT:
1206 switch (cmd) {
1207 case CMD_DISCOVER_IDENT:
1208 /* 6.4.4.3.1: Only respond as UFP (device) */
1209 if (port->data_role == TYPEC_DEVICE &&
1210 port->nr_snk_vdo) {
1211 for (i = 0; i < port->nr_snk_vdo; i++)
1212 response[i + 1] = port->snk_vdo[i];
1213 rlen = port->nr_snk_vdo + 1;
1214 }
1215 break;
1216 case CMD_DISCOVER_SVID:
1217 break;
1218 case CMD_DISCOVER_MODES:
1219 break;
1220 case CMD_ENTER_MODE:
1221 break;
1222 case CMD_EXIT_MODE:
1223 break;
1224 case CMD_ATTENTION:
1225 /* Attention command does not have response */
1226 *adev_action = ADEV_ATTENTION;
1227 return 0;
1228 default:
1229 break;
1230 }
1231 if (rlen >= 1) {
1232 response[0] = p[0] | VDO_CMDT(CMDT_RSP_ACK);
1233 } else if (rlen == 0) {
1234 response[0] = p[0] | VDO_CMDT(CMDT_RSP_NAK);
1235 rlen = 1;
1236 } else {
1237 response[0] = p[0] | VDO_CMDT(CMDT_RSP_BUSY);
1238 rlen = 1;
1239 }
1240 break;
1241 case CMDT_RSP_ACK:
1242 /* silently drop message if we are not connected */
1243 if (IS_ERR_OR_NULL(port->partner))
1244 break;
1245
1246 switch (cmd) {
1247 case CMD_DISCOVER_IDENT:
1248 /* 6.4.4.3.1 */
1249 svdm_consume_identity(port, p, cnt);
1250 response[0] = VDO(USB_SID_PD, 1, CMD_DISCOVER_SVID);
1251 rlen = 1;
1252 break;
1253 case CMD_DISCOVER_SVID:
1254 /* 6.4.4.3.2 */
1255 if (svdm_consume_svids(port, p, cnt)) {
1256 response[0] = VDO(USB_SID_PD, 1,
1257 CMD_DISCOVER_SVID);
1258 rlen = 1;
1259 } else if (modep->nsvids && supports_modal(port)) {
1260 response[0] = VDO(modep->svids[0], 1,
1261 CMD_DISCOVER_MODES);
1262 rlen = 1;
1263 }
1264 break;
1265 case CMD_DISCOVER_MODES:
1266 /* 6.4.4.3.3 */
1267 svdm_consume_modes(port, p, cnt);
1268 modep->svid_index++;
1269 if (modep->svid_index < modep->nsvids) {
1270 u16 svid = modep->svids[modep->svid_index];
1271 response[0] = VDO(svid, 1, CMD_DISCOVER_MODES);
1272 rlen = 1;
1273 } else {
1274 tcpm_register_partner_altmodes(port);
1275 }
1276 break;
1277 case CMD_ENTER_MODE:
1278 if (adev && pdev) {
1279 typec_altmode_update_active(pdev, true);
1280 *adev_action = ADEV_QUEUE_VDM_SEND_EXIT_MODE_ON_FAIL;
1281 }
1282 return 0;
1283 case CMD_EXIT_MODE:
1284 if (adev && pdev) {
1285 typec_altmode_update_active(pdev, false);
1286 /* Back to USB Operation */
1287 *adev_action = ADEV_NOTIFY_USB_AND_QUEUE_VDM;
1288 return 0;
1289 }
1290 break;
1291 default:
1292 break;
1293 }
1294 break;
1295 case CMDT_RSP_NAK:
1296 switch (cmd) {
1297 case CMD_ENTER_MODE:
1298 /* Back to USB Operation */
1299 *adev_action = ADEV_NOTIFY_USB_AND_QUEUE_VDM;
1300 return 0;
1301 default:
1302 break;
1303 }
1304 break;
1305 default:
1306 break;
1307 }
1308
1309 /* Informing the alternate mode drivers about everything */
1310 *adev_action = ADEV_QUEUE_VDM;
1311 return rlen;
1312 }
1313
tcpm_handle_vdm_request(struct tcpm_port * port,const __le32 * payload,int cnt)1314 static void tcpm_handle_vdm_request(struct tcpm_port *port,
1315 const __le32 *payload, int cnt)
1316 {
1317 enum adev_actions adev_action = ADEV_NONE;
1318 struct typec_altmode *adev;
1319 u32 p[PD_MAX_PAYLOAD];
1320 u32 response[8] = { };
1321 int i, rlen = 0;
1322
1323 for (i = 0; i < cnt; i++)
1324 p[i] = le32_to_cpu(payload[i]);
1325
1326 adev = typec_match_altmode(port->port_altmode, ALTMODE_DISCOVERY_MAX,
1327 PD_VDO_VID(p[0]), PD_VDO_OPOS(p[0]));
1328
1329 if (port->vdm_state == VDM_STATE_BUSY) {
1330 /* If UFP responded busy retry after timeout */
1331 if (PD_VDO_CMDT(p[0]) == CMDT_RSP_BUSY) {
1332 port->vdm_state = VDM_STATE_WAIT_RSP_BUSY;
1333 port->vdo_retry = (p[0] & ~VDO_CMDT_MASK) |
1334 CMDT_INIT;
1335 mod_vdm_delayed_work(port, PD_T_VDM_BUSY);
1336 return;
1337 }
1338 port->vdm_state = VDM_STATE_DONE;
1339 }
1340
1341 if (PD_VDO_SVDM(p[0]))
1342 rlen = tcpm_pd_svdm(port, adev, p, cnt, response, &adev_action);
1343
1344 /*
1345 * We are done with any state stored in the port struct now, except
1346 * for any port struct changes done by the tcpm_queue_vdm() call
1347 * below, which is a separate operation.
1348 *
1349 * So we can safely release the lock here; and we MUST release the
1350 * lock here to avoid an AB BA lock inversion:
1351 *
1352 * If we keep the lock here then the lock ordering in this path is:
1353 * 1. tcpm_pd_rx_handler take the tcpm port lock
1354 * 2. One of the typec_altmode_* calls below takes the alt-mode's lock
1355 *
1356 * And we also have this ordering:
1357 * 1. alt-mode driver takes the alt-mode's lock
1358 * 2. alt-mode driver calls tcpm_altmode_enter which takes the
1359 * tcpm port lock
1360 *
1361 * Dropping our lock here avoids this.
1362 */
1363 mutex_unlock(&port->lock);
1364
1365 if (adev) {
1366 switch (adev_action) {
1367 case ADEV_NONE:
1368 break;
1369 case ADEV_NOTIFY_USB_AND_QUEUE_VDM:
1370 WARN_ON(typec_altmode_notify(adev, TYPEC_STATE_USB, NULL));
1371 typec_altmode_vdm(adev, p[0], &p[1], cnt);
1372 break;
1373 case ADEV_QUEUE_VDM:
1374 typec_altmode_vdm(adev, p[0], &p[1], cnt);
1375 break;
1376 case ADEV_QUEUE_VDM_SEND_EXIT_MODE_ON_FAIL:
1377 if (typec_altmode_vdm(adev, p[0], &p[1], cnt)) {
1378 response[0] = VDO(adev->svid, 1, CMD_EXIT_MODE);
1379 response[0] |= VDO_OPOS(adev->mode);
1380 rlen = 1;
1381 }
1382 break;
1383 case ADEV_ATTENTION:
1384 typec_altmode_attention(adev, p[1]);
1385 break;
1386 }
1387 }
1388
1389 /*
1390 * We must re-take the lock here to balance the unlock in
1391 * tcpm_pd_rx_handler, note that no changes, other then the
1392 * tcpm_queue_vdm call, are made while the lock is held again.
1393 * All that is done after the call is unwinding the call stack until
1394 * we return to tcpm_pd_rx_handler and do the unlock there.
1395 */
1396 mutex_lock(&port->lock);
1397
1398 if (rlen > 0)
1399 tcpm_queue_vdm(port, response[0], &response[1], rlen - 1);
1400 }
1401
tcpm_send_vdm(struct tcpm_port * port,u32 vid,int cmd,const u32 * data,int count)1402 static void tcpm_send_vdm(struct tcpm_port *port, u32 vid, int cmd,
1403 const u32 *data, int count)
1404 {
1405 u32 header;
1406
1407 if (WARN_ON(count > VDO_MAX_SIZE - 1))
1408 count = VDO_MAX_SIZE - 1;
1409
1410 /* set VDM header with VID & CMD */
1411 header = VDO(vid, ((vid & USB_SID_PD) == USB_SID_PD) ?
1412 1 : (PD_VDO_CMD(cmd) <= CMD_ATTENTION), cmd);
1413 tcpm_queue_vdm(port, header, data, count);
1414 }
1415
vdm_ready_timeout(u32 vdm_hdr)1416 static unsigned int vdm_ready_timeout(u32 vdm_hdr)
1417 {
1418 unsigned int timeout;
1419 int cmd = PD_VDO_CMD(vdm_hdr);
1420
1421 /* its not a structured VDM command */
1422 if (!PD_VDO_SVDM(vdm_hdr))
1423 return PD_T_VDM_UNSTRUCTURED;
1424
1425 switch (PD_VDO_CMDT(vdm_hdr)) {
1426 case CMDT_INIT:
1427 if (cmd == CMD_ENTER_MODE || cmd == CMD_EXIT_MODE)
1428 timeout = PD_T_VDM_WAIT_MODE_E;
1429 else
1430 timeout = PD_T_VDM_SNDR_RSP;
1431 break;
1432 default:
1433 if (cmd == CMD_ENTER_MODE || cmd == CMD_EXIT_MODE)
1434 timeout = PD_T_VDM_E_MODE;
1435 else
1436 timeout = PD_T_VDM_RCVR_RSP;
1437 break;
1438 }
1439 return timeout;
1440 }
1441
vdm_run_state_machine(struct tcpm_port * port)1442 static void vdm_run_state_machine(struct tcpm_port *port)
1443 {
1444 struct pd_message msg;
1445 int i, res;
1446
1447 switch (port->vdm_state) {
1448 case VDM_STATE_READY:
1449 /* Only transmit VDM if attached */
1450 if (!port->attached) {
1451 port->vdm_state = VDM_STATE_ERR_BUSY;
1452 break;
1453 }
1454
1455 /*
1456 * if there's traffic or we're not in PDO ready state don't send
1457 * a VDM.
1458 */
1459 if (port->state != SRC_READY && port->state != SNK_READY)
1460 break;
1461
1462 /* Prepare and send VDM */
1463 memset(&msg, 0, sizeof(msg));
1464 msg.header = PD_HEADER_LE(PD_DATA_VENDOR_DEF,
1465 port->pwr_role,
1466 port->data_role,
1467 port->negotiated_rev,
1468 port->message_id, port->vdo_count);
1469 for (i = 0; i < port->vdo_count; i++)
1470 msg.payload[i] = cpu_to_le32(port->vdo_data[i]);
1471 res = tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
1472 if (res < 0) {
1473 port->vdm_state = VDM_STATE_ERR_SEND;
1474 } else {
1475 unsigned long timeout;
1476
1477 port->vdm_retries = 0;
1478 port->vdm_state = VDM_STATE_BUSY;
1479 timeout = vdm_ready_timeout(port->vdo_data[0]);
1480 mod_vdm_delayed_work(port, timeout);
1481 }
1482 break;
1483 case VDM_STATE_WAIT_RSP_BUSY:
1484 port->vdo_data[0] = port->vdo_retry;
1485 port->vdo_count = 1;
1486 port->vdm_state = VDM_STATE_READY;
1487 break;
1488 case VDM_STATE_BUSY:
1489 port->vdm_state = VDM_STATE_ERR_TMOUT;
1490 break;
1491 case VDM_STATE_ERR_SEND:
1492 /*
1493 * A partner which does not support USB PD will not reply,
1494 * so this is not a fatal error. At the same time, some
1495 * devices may not return GoodCRC under some circumstances,
1496 * so we need to retry.
1497 */
1498 if (port->vdm_retries < 3) {
1499 tcpm_log(port, "VDM Tx error, retry");
1500 port->vdm_retries++;
1501 port->vdm_state = VDM_STATE_READY;
1502 }
1503 break;
1504 default:
1505 break;
1506 }
1507 }
1508
vdm_state_machine_work(struct kthread_work * work)1509 static void vdm_state_machine_work(struct kthread_work *work)
1510 {
1511 struct tcpm_port *port = container_of(work, struct tcpm_port, vdm_state_machine);
1512 enum vdm_states prev_state;
1513
1514 mutex_lock(&port->lock);
1515
1516 /*
1517 * Continue running as long as the port is not busy and there was
1518 * a state change.
1519 */
1520 do {
1521 prev_state = port->vdm_state;
1522 vdm_run_state_machine(port);
1523 } while (port->vdm_state != prev_state &&
1524 port->vdm_state != VDM_STATE_BUSY);
1525
1526 mutex_unlock(&port->lock);
1527 }
1528
1529 enum pdo_err {
1530 PDO_NO_ERR,
1531 PDO_ERR_NO_VSAFE5V,
1532 PDO_ERR_VSAFE5V_NOT_FIRST,
1533 PDO_ERR_PDO_TYPE_NOT_IN_ORDER,
1534 PDO_ERR_FIXED_NOT_SORTED,
1535 PDO_ERR_VARIABLE_BATT_NOT_SORTED,
1536 PDO_ERR_DUPE_PDO,
1537 PDO_ERR_PPS_APDO_NOT_SORTED,
1538 PDO_ERR_DUPE_PPS_APDO,
1539 };
1540
1541 static const char * const pdo_err_msg[] = {
1542 [PDO_ERR_NO_VSAFE5V] =
1543 " err: source/sink caps should atleast have vSafe5V",
1544 [PDO_ERR_VSAFE5V_NOT_FIRST] =
1545 " err: vSafe5V Fixed Supply Object Shall always be the first object",
1546 [PDO_ERR_PDO_TYPE_NOT_IN_ORDER] =
1547 " err: PDOs should be in the following order: Fixed; Battery; Variable",
1548 [PDO_ERR_FIXED_NOT_SORTED] =
1549 " err: Fixed supply pdos should be in increasing order of their fixed voltage",
1550 [PDO_ERR_VARIABLE_BATT_NOT_SORTED] =
1551 " err: Variable/Battery supply pdos should be in increasing order of their minimum voltage",
1552 [PDO_ERR_DUPE_PDO] =
1553 " err: Variable/Batt supply pdos cannot have same min/max voltage",
1554 [PDO_ERR_PPS_APDO_NOT_SORTED] =
1555 " err: Programmable power supply apdos should be in increasing order of their maximum voltage",
1556 [PDO_ERR_DUPE_PPS_APDO] =
1557 " err: Programmable power supply apdos cannot have same min/max voltage and max current",
1558 };
1559
tcpm_caps_err(struct tcpm_port * port,const u32 * pdo,unsigned int nr_pdo)1560 static enum pdo_err tcpm_caps_err(struct tcpm_port *port, const u32 *pdo,
1561 unsigned int nr_pdo)
1562 {
1563 unsigned int i;
1564
1565 /* Should at least contain vSafe5v */
1566 if (nr_pdo < 1)
1567 return PDO_ERR_NO_VSAFE5V;
1568
1569 /* The vSafe5V Fixed Supply Object Shall always be the first object */
1570 if (pdo_type(pdo[0]) != PDO_TYPE_FIXED ||
1571 pdo_fixed_voltage(pdo[0]) != VSAFE5V)
1572 return PDO_ERR_VSAFE5V_NOT_FIRST;
1573
1574 for (i = 1; i < nr_pdo; i++) {
1575 if (pdo_type(pdo[i]) < pdo_type(pdo[i - 1])) {
1576 return PDO_ERR_PDO_TYPE_NOT_IN_ORDER;
1577 } else if (pdo_type(pdo[i]) == pdo_type(pdo[i - 1])) {
1578 enum pd_pdo_type type = pdo_type(pdo[i]);
1579
1580 switch (type) {
1581 /*
1582 * The remaining Fixed Supply Objects, if
1583 * present, shall be sent in voltage order;
1584 * lowest to highest.
1585 */
1586 case PDO_TYPE_FIXED:
1587 if (pdo_fixed_voltage(pdo[i]) <=
1588 pdo_fixed_voltage(pdo[i - 1]))
1589 return PDO_ERR_FIXED_NOT_SORTED;
1590 break;
1591 /*
1592 * The Battery Supply Objects and Variable
1593 * supply, if present shall be sent in Minimum
1594 * Voltage order; lowest to highest.
1595 */
1596 case PDO_TYPE_VAR:
1597 case PDO_TYPE_BATT:
1598 if (pdo_min_voltage(pdo[i]) <
1599 pdo_min_voltage(pdo[i - 1]))
1600 return PDO_ERR_VARIABLE_BATT_NOT_SORTED;
1601 else if ((pdo_min_voltage(pdo[i]) ==
1602 pdo_min_voltage(pdo[i - 1])) &&
1603 (pdo_max_voltage(pdo[i]) ==
1604 pdo_max_voltage(pdo[i - 1])))
1605 return PDO_ERR_DUPE_PDO;
1606 break;
1607 /*
1608 * The Programmable Power Supply APDOs, if present,
1609 * shall be sent in Maximum Voltage order;
1610 * lowest to highest.
1611 */
1612 case PDO_TYPE_APDO:
1613 if (pdo_apdo_type(pdo[i]) != APDO_TYPE_PPS)
1614 break;
1615
1616 if (pdo_pps_apdo_max_voltage(pdo[i]) <
1617 pdo_pps_apdo_max_voltage(pdo[i - 1]))
1618 return PDO_ERR_PPS_APDO_NOT_SORTED;
1619 else if (pdo_pps_apdo_min_voltage(pdo[i]) ==
1620 pdo_pps_apdo_min_voltage(pdo[i - 1]) &&
1621 pdo_pps_apdo_max_voltage(pdo[i]) ==
1622 pdo_pps_apdo_max_voltage(pdo[i - 1]) &&
1623 pdo_pps_apdo_max_current(pdo[i]) ==
1624 pdo_pps_apdo_max_current(pdo[i - 1]))
1625 return PDO_ERR_DUPE_PPS_APDO;
1626 break;
1627 default:
1628 tcpm_log_force(port, " Unknown pdo type");
1629 }
1630 }
1631 }
1632
1633 return PDO_NO_ERR;
1634 }
1635
tcpm_validate_caps(struct tcpm_port * port,const u32 * pdo,unsigned int nr_pdo)1636 static int tcpm_validate_caps(struct tcpm_port *port, const u32 *pdo,
1637 unsigned int nr_pdo)
1638 {
1639 enum pdo_err err_index = tcpm_caps_err(port, pdo, nr_pdo);
1640
1641 if (err_index != PDO_NO_ERR) {
1642 tcpm_log_force(port, " %s", pdo_err_msg[err_index]);
1643 return -EINVAL;
1644 }
1645
1646 return 0;
1647 }
1648
tcpm_altmode_enter(struct typec_altmode * altmode,u32 * vdo)1649 static int tcpm_altmode_enter(struct typec_altmode *altmode, u32 *vdo)
1650 {
1651 struct tcpm_port *port = typec_altmode_get_drvdata(altmode);
1652 u32 header;
1653
1654 header = VDO(altmode->svid, vdo ? 2 : 1, CMD_ENTER_MODE);
1655 header |= VDO_OPOS(altmode->mode);
1656
1657 tcpm_queue_vdm_unlocked(port, header, vdo, vdo ? 1 : 0);
1658 return 0;
1659 }
1660
tcpm_altmode_exit(struct typec_altmode * altmode)1661 static int tcpm_altmode_exit(struct typec_altmode *altmode)
1662 {
1663 struct tcpm_port *port = typec_altmode_get_drvdata(altmode);
1664 u32 header;
1665
1666 header = VDO(altmode->svid, 1, CMD_EXIT_MODE);
1667 header |= VDO_OPOS(altmode->mode);
1668
1669 tcpm_queue_vdm_unlocked(port, header, NULL, 0);
1670 return 0;
1671 }
1672
tcpm_altmode_vdm(struct typec_altmode * altmode,u32 header,const u32 * data,int count)1673 static int tcpm_altmode_vdm(struct typec_altmode *altmode,
1674 u32 header, const u32 *data, int count)
1675 {
1676 struct tcpm_port *port = typec_altmode_get_drvdata(altmode);
1677
1678 tcpm_queue_vdm_unlocked(port, header, data, count - 1);
1679
1680 return 0;
1681 }
1682
1683 static const struct typec_altmode_ops tcpm_altmode_ops = {
1684 .enter = tcpm_altmode_enter,
1685 .exit = tcpm_altmode_exit,
1686 .vdm = tcpm_altmode_vdm,
1687 };
1688
1689 /*
1690 * PD (data, control) command handling functions
1691 */
ready_state(struct tcpm_port * port)1692 static inline enum tcpm_state ready_state(struct tcpm_port *port)
1693 {
1694 if (port->pwr_role == TYPEC_SOURCE)
1695 return SRC_READY;
1696 else
1697 return SNK_READY;
1698 }
1699
1700 static int tcpm_pd_send_control(struct tcpm_port *port,
1701 enum pd_ctrl_msg_type type);
1702
tcpm_handle_alert(struct tcpm_port * port,const __le32 * payload,int cnt)1703 static void tcpm_handle_alert(struct tcpm_port *port, const __le32 *payload,
1704 int cnt)
1705 {
1706 u32 p0 = le32_to_cpu(payload[0]);
1707 unsigned int type = usb_pd_ado_type(p0);
1708
1709 if (!type) {
1710 tcpm_log(port, "Alert message received with no type");
1711 return;
1712 }
1713
1714 /* Just handling non-battery alerts for now */
1715 if (!(type & USB_PD_ADO_TYPE_BATT_STATUS_CHANGE)) {
1716 switch (port->state) {
1717 case SRC_READY:
1718 case SNK_READY:
1719 tcpm_set_state(port, GET_STATUS_SEND, 0);
1720 break;
1721 default:
1722 tcpm_queue_message(port, PD_MSG_CTRL_WAIT);
1723 break;
1724 }
1725 }
1726 }
1727
tcpm_pd_data_request(struct tcpm_port * port,const struct pd_message * msg)1728 static void tcpm_pd_data_request(struct tcpm_port *port,
1729 const struct pd_message *msg)
1730 {
1731 enum pd_data_msg_type type = pd_header_type_le(msg->header);
1732 unsigned int cnt = pd_header_cnt_le(msg->header);
1733 unsigned int rev = pd_header_rev_le(msg->header);
1734 unsigned int i;
1735 enum frs_typec_current frs_current;
1736 bool frs_enable;
1737 int ret;
1738
1739 switch (type) {
1740 case PD_DATA_SOURCE_CAP:
1741 if (port->pwr_role != TYPEC_SINK)
1742 break;
1743
1744 for (i = 0; i < cnt; i++)
1745 port->source_caps[i] = le32_to_cpu(msg->payload[i]);
1746
1747 port->nr_source_caps = cnt;
1748
1749 tcpm_log_source_caps(port);
1750
1751 tcpm_validate_caps(port, port->source_caps,
1752 port->nr_source_caps);
1753
1754 /*
1755 * Adjust revision in subsequent message headers, as required,
1756 * to comply with 6.2.1.1.5 of the USB PD 3.0 spec. We don't
1757 * support Rev 1.0 so just do nothing in that scenario.
1758 */
1759 if (rev == PD_REV10)
1760 break;
1761
1762 if (rev < PD_MAX_REV)
1763 port->negotiated_rev = rev;
1764
1765 /*
1766 * This message may be received even if VBUS is not
1767 * present. This is quite unexpected; see USB PD
1768 * specification, sections 8.3.3.6.3.1 and 8.3.3.6.3.2.
1769 * However, at the same time, we must be ready to
1770 * receive this message and respond to it 15ms after
1771 * receiving PS_RDY during power swap operations, no matter
1772 * if VBUS is available or not (USB PD specification,
1773 * section 6.5.9.2).
1774 * So we need to accept the message either way,
1775 * but be prepared to keep waiting for VBUS after it was
1776 * handled.
1777 */
1778 tcpm_set_state(port, SNK_NEGOTIATE_CAPABILITIES, 0);
1779 break;
1780 case PD_DATA_REQUEST:
1781 if (port->pwr_role != TYPEC_SOURCE ||
1782 cnt != 1) {
1783 tcpm_queue_message(port, PD_MSG_CTRL_REJECT);
1784 break;
1785 }
1786
1787 /*
1788 * Adjust revision in subsequent message headers, as required,
1789 * to comply with 6.2.1.1.5 of the USB PD 3.0 spec. We don't
1790 * support Rev 1.0 so just reject in that scenario.
1791 */
1792 if (rev == PD_REV10) {
1793 tcpm_queue_message(port, PD_MSG_CTRL_REJECT);
1794 break;
1795 }
1796
1797 if (rev < PD_MAX_REV)
1798 port->negotiated_rev = rev;
1799
1800 port->sink_request = le32_to_cpu(msg->payload[0]);
1801 tcpm_set_state(port, SRC_NEGOTIATE_CAPABILITIES, 0);
1802 break;
1803 case PD_DATA_SINK_CAP:
1804 /* We don't do anything with this at the moment... */
1805 for (i = 0; i < cnt; i++)
1806 port->sink_caps[i] = le32_to_cpu(msg->payload[i]);
1807
1808 frs_current = (port->sink_caps[0] & PDO_FIXED_FRS_CURR_MASK) >>
1809 PDO_FIXED_FRS_CURR_SHIFT;
1810 frs_enable = frs_current && (frs_current <= port->frs_current);
1811 tcpm_log(port,
1812 "Port partner FRS capable partner_frs_current:%u port_frs_current:%u enable:%c",
1813 frs_current, port->frs_current, frs_enable ? 'y' : 'n');
1814 if (frs_enable) {
1815 ret = port->tcpc->enable_frs(port->tcpc, true);
1816 tcpm_log(port, "Enable FRS %s, ret:%d\n", ret ? "fail" : "success", ret);
1817 }
1818
1819 port->nr_sink_caps = cnt;
1820 port->sink_cap_done = true;
1821 tcpm_set_state(port, SNK_READY, 0);
1822 break;
1823 case PD_DATA_VENDOR_DEF:
1824 tcpm_handle_vdm_request(port, msg->payload, cnt);
1825 break;
1826 case PD_DATA_BIST:
1827 if (port->state == SRC_READY || port->state == SNK_READY) {
1828 port->bist_request = le32_to_cpu(msg->payload[0]);
1829 tcpm_set_state(port, BIST_RX, 0);
1830 }
1831 break;
1832 case PD_DATA_ALERT:
1833 tcpm_handle_alert(port, msg->payload, cnt);
1834 break;
1835 case PD_DATA_BATT_STATUS:
1836 case PD_DATA_GET_COUNTRY_INFO:
1837 /* Currently unsupported */
1838 tcpm_queue_message(port, PD_MSG_CTRL_NOT_SUPP);
1839 break;
1840 default:
1841 tcpm_log(port, "Unhandled data message type %#x", type);
1842 break;
1843 }
1844 }
1845
tcpm_pps_complete(struct tcpm_port * port,int result)1846 static void tcpm_pps_complete(struct tcpm_port *port, int result)
1847 {
1848 if (port->pps_pending) {
1849 port->pps_status = result;
1850 port->pps_pending = false;
1851 complete(&port->pps_complete);
1852 }
1853 }
1854
tcpm_pd_ctrl_request(struct tcpm_port * port,const struct pd_message * msg)1855 static void tcpm_pd_ctrl_request(struct tcpm_port *port,
1856 const struct pd_message *msg)
1857 {
1858 enum pd_ctrl_msg_type type = pd_header_type_le(msg->header);
1859 enum tcpm_state next_state;
1860
1861 switch (type) {
1862 case PD_CTRL_GOOD_CRC:
1863 case PD_CTRL_PING:
1864 break;
1865 case PD_CTRL_GET_SOURCE_CAP:
1866 switch (port->state) {
1867 case SRC_READY:
1868 case SNK_READY:
1869 tcpm_queue_message(port, PD_MSG_DATA_SOURCE_CAP);
1870 break;
1871 default:
1872 tcpm_queue_message(port, PD_MSG_CTRL_REJECT);
1873 break;
1874 }
1875 break;
1876 case PD_CTRL_GET_SINK_CAP:
1877 switch (port->state) {
1878 case SRC_READY:
1879 case SNK_READY:
1880 tcpm_queue_message(port, PD_MSG_DATA_SINK_CAP);
1881 break;
1882 default:
1883 tcpm_queue_message(port, PD_MSG_CTRL_REJECT);
1884 break;
1885 }
1886 break;
1887 case PD_CTRL_GOTO_MIN:
1888 break;
1889 case PD_CTRL_PS_RDY:
1890 switch (port->state) {
1891 case SNK_TRANSITION_SINK:
1892 if (port->vbus_present) {
1893 tcpm_set_current_limit(port,
1894 port->req_current_limit,
1895 port->req_supply_voltage);
1896 port->explicit_contract = true;
1897 tcpm_set_state(port, SNK_READY, 0);
1898 } else {
1899 /*
1900 * Seen after power swap. Keep waiting for VBUS
1901 * in a transitional state.
1902 */
1903 tcpm_set_state(port,
1904 SNK_TRANSITION_SINK_VBUS, 0);
1905 }
1906 break;
1907 case PR_SWAP_SRC_SNK_SOURCE_OFF_CC_DEBOUNCED:
1908 tcpm_set_state(port, PR_SWAP_SRC_SNK_SINK_ON, 0);
1909 break;
1910 case PR_SWAP_SNK_SRC_SINK_OFF:
1911 tcpm_set_state(port, PR_SWAP_SNK_SRC_SOURCE_ON, 0);
1912 break;
1913 case VCONN_SWAP_WAIT_FOR_VCONN:
1914 tcpm_set_state(port, VCONN_SWAP_TURN_OFF_VCONN, 0);
1915 break;
1916 case FR_SWAP_SNK_SRC_TRANSITION_TO_OFF:
1917 tcpm_set_state(port, FR_SWAP_SNK_SRC_NEW_SINK_READY, 0);
1918 break;
1919 default:
1920 break;
1921 }
1922 break;
1923 case PD_CTRL_REJECT:
1924 case PD_CTRL_WAIT:
1925 case PD_CTRL_NOT_SUPP:
1926 switch (port->state) {
1927 case SNK_NEGOTIATE_CAPABILITIES:
1928 /* USB PD specification, Figure 8-43 */
1929 if (port->explicit_contract)
1930 next_state = SNK_READY;
1931 else
1932 next_state = SNK_WAIT_CAPABILITIES;
1933 tcpm_set_state(port, next_state, 0);
1934 break;
1935 case SNK_NEGOTIATE_PPS_CAPABILITIES:
1936 /* Revert data back from any requested PPS updates */
1937 port->pps_data.req_out_volt = port->supply_voltage;
1938 port->pps_data.req_op_curr = port->current_limit;
1939 port->pps_status = (type == PD_CTRL_WAIT ?
1940 -EAGAIN : -EOPNOTSUPP);
1941 tcpm_set_state(port, SNK_READY, 0);
1942 break;
1943 case DR_SWAP_SEND:
1944 port->swap_status = (type == PD_CTRL_WAIT ?
1945 -EAGAIN : -EOPNOTSUPP);
1946 tcpm_set_state(port, DR_SWAP_CANCEL, 0);
1947 break;
1948 case PR_SWAP_SEND:
1949 port->swap_status = (type == PD_CTRL_WAIT ?
1950 -EAGAIN : -EOPNOTSUPP);
1951 tcpm_set_state(port, PR_SWAP_CANCEL, 0);
1952 break;
1953 case VCONN_SWAP_SEND:
1954 port->swap_status = (type == PD_CTRL_WAIT ?
1955 -EAGAIN : -EOPNOTSUPP);
1956 tcpm_set_state(port, VCONN_SWAP_CANCEL, 0);
1957 break;
1958 case FR_SWAP_SEND:
1959 tcpm_set_state(port, FR_SWAP_CANCEL, 0);
1960 break;
1961 case GET_SINK_CAP:
1962 port->sink_cap_done = true;
1963 tcpm_set_state(port, ready_state(port), 0);
1964 break;
1965 default:
1966 break;
1967 }
1968 break;
1969 case PD_CTRL_ACCEPT:
1970 switch (port->state) {
1971 case SNK_NEGOTIATE_CAPABILITIES:
1972 port->pps_data.active = false;
1973 tcpm_set_state(port, SNK_TRANSITION_SINK, 0);
1974 break;
1975 case SNK_NEGOTIATE_PPS_CAPABILITIES:
1976 port->pps_data.active = true;
1977 port->pps_data.min_volt = port->pps_data.req_min_volt;
1978 port->pps_data.max_volt = port->pps_data.req_max_volt;
1979 port->pps_data.max_curr = port->pps_data.req_max_curr;
1980 port->req_supply_voltage = port->pps_data.req_out_volt;
1981 port->req_current_limit = port->pps_data.req_op_curr;
1982 power_supply_changed(port->psy);
1983 tcpm_set_state(port, SNK_TRANSITION_SINK, 0);
1984 break;
1985 case SOFT_RESET_SEND:
1986 port->message_id = 0;
1987 port->rx_msgid = -1;
1988 if (port->pwr_role == TYPEC_SOURCE)
1989 next_state = SRC_SEND_CAPABILITIES;
1990 else
1991 next_state = SNK_WAIT_CAPABILITIES;
1992 tcpm_set_state(port, next_state, 0);
1993 break;
1994 case DR_SWAP_SEND:
1995 tcpm_set_state(port, DR_SWAP_CHANGE_DR, 0);
1996 break;
1997 case PR_SWAP_SEND:
1998 tcpm_set_state(port, PR_SWAP_START, 0);
1999 break;
2000 case VCONN_SWAP_SEND:
2001 tcpm_set_state(port, VCONN_SWAP_START, 0);
2002 break;
2003 case FR_SWAP_SEND:
2004 tcpm_set_state(port, FR_SWAP_SNK_SRC_TRANSITION_TO_OFF, 0);
2005 break;
2006 default:
2007 break;
2008 }
2009 break;
2010 case PD_CTRL_SOFT_RESET:
2011 tcpm_set_state(port, SOFT_RESET, 0);
2012 break;
2013 case PD_CTRL_DR_SWAP:
2014 if (port->typec_caps.data != TYPEC_PORT_DRD) {
2015 tcpm_queue_message(port, PD_MSG_CTRL_REJECT);
2016 break;
2017 }
2018 /*
2019 * XXX
2020 * 6.3.9: If an alternate mode is active, a request to swap
2021 * alternate modes shall trigger a port reset.
2022 */
2023 switch (port->state) {
2024 case SRC_READY:
2025 case SNK_READY:
2026 tcpm_set_state(port, DR_SWAP_ACCEPT, 0);
2027 break;
2028 default:
2029 tcpm_queue_message(port, PD_MSG_CTRL_WAIT);
2030 break;
2031 }
2032 break;
2033 case PD_CTRL_PR_SWAP:
2034 if (port->port_type != TYPEC_PORT_DRP) {
2035 tcpm_queue_message(port, PD_MSG_CTRL_REJECT);
2036 break;
2037 }
2038 switch (port->state) {
2039 case SRC_READY:
2040 case SNK_READY:
2041 tcpm_set_state(port, PR_SWAP_ACCEPT, 0);
2042 break;
2043 default:
2044 tcpm_queue_message(port, PD_MSG_CTRL_WAIT);
2045 break;
2046 }
2047 break;
2048 case PD_CTRL_VCONN_SWAP:
2049 switch (port->state) {
2050 case SRC_READY:
2051 case SNK_READY:
2052 tcpm_set_state(port, VCONN_SWAP_ACCEPT, 0);
2053 break;
2054 default:
2055 tcpm_queue_message(port, PD_MSG_CTRL_WAIT);
2056 break;
2057 }
2058 break;
2059 case PD_CTRL_GET_SOURCE_CAP_EXT:
2060 case PD_CTRL_GET_STATUS:
2061 case PD_CTRL_FR_SWAP:
2062 case PD_CTRL_GET_PPS_STATUS:
2063 case PD_CTRL_GET_COUNTRY_CODES:
2064 /* Currently not supported */
2065 tcpm_queue_message(port, PD_MSG_CTRL_NOT_SUPP);
2066 break;
2067 default:
2068 tcpm_log(port, "Unhandled ctrl message type %#x", type);
2069 break;
2070 }
2071 }
2072
tcpm_pd_ext_msg_request(struct tcpm_port * port,const struct pd_message * msg)2073 static void tcpm_pd_ext_msg_request(struct tcpm_port *port,
2074 const struct pd_message *msg)
2075 {
2076 enum pd_ext_msg_type type = pd_header_type_le(msg->header);
2077 unsigned int data_size = pd_ext_header_data_size_le(msg->ext_msg.header);
2078
2079 if (!(msg->ext_msg.header & PD_EXT_HDR_CHUNKED)) {
2080 tcpm_log(port, "Unchunked extended messages unsupported");
2081 return;
2082 }
2083
2084 if (data_size > PD_EXT_MAX_CHUNK_DATA) {
2085 tcpm_log(port, "Chunk handling not yet supported");
2086 return;
2087 }
2088
2089 switch (type) {
2090 case PD_EXT_STATUS:
2091 /*
2092 * If PPS related events raised then get PPS status to clear
2093 * (see USB PD 3.0 Spec, 6.5.2.4)
2094 */
2095 if (msg->ext_msg.data[USB_PD_EXT_SDB_EVENT_FLAGS] &
2096 USB_PD_EXT_SDB_PPS_EVENTS)
2097 tcpm_set_state(port, GET_PPS_STATUS_SEND, 0);
2098 else
2099 tcpm_set_state(port, ready_state(port), 0);
2100 break;
2101 case PD_EXT_PPS_STATUS:
2102 /*
2103 * For now the PPS status message is used to clear events
2104 * and nothing more.
2105 */
2106 tcpm_set_state(port, ready_state(port), 0);
2107 break;
2108 case PD_EXT_SOURCE_CAP_EXT:
2109 case PD_EXT_GET_BATT_CAP:
2110 case PD_EXT_GET_BATT_STATUS:
2111 case PD_EXT_BATT_CAP:
2112 case PD_EXT_GET_MANUFACTURER_INFO:
2113 case PD_EXT_MANUFACTURER_INFO:
2114 case PD_EXT_SECURITY_REQUEST:
2115 case PD_EXT_SECURITY_RESPONSE:
2116 case PD_EXT_FW_UPDATE_REQUEST:
2117 case PD_EXT_FW_UPDATE_RESPONSE:
2118 case PD_EXT_COUNTRY_INFO:
2119 case PD_EXT_COUNTRY_CODES:
2120 tcpm_queue_message(port, PD_MSG_CTRL_NOT_SUPP);
2121 break;
2122 default:
2123 tcpm_log(port, "Unhandled extended message type %#x", type);
2124 break;
2125 }
2126 }
2127
tcpm_pd_rx_handler(struct kthread_work * work)2128 static void tcpm_pd_rx_handler(struct kthread_work *work)
2129 {
2130 struct pd_rx_event *event = container_of(work,
2131 struct pd_rx_event, work);
2132 const struct pd_message *msg = &event->msg;
2133 unsigned int cnt = pd_header_cnt_le(msg->header);
2134 struct tcpm_port *port = event->port;
2135
2136 mutex_lock(&port->lock);
2137
2138 tcpm_log(port, "PD RX, header: %#x [%d]", le16_to_cpu(msg->header),
2139 port->attached);
2140
2141 if (port->attached) {
2142 enum pd_ctrl_msg_type type = pd_header_type_le(msg->header);
2143 unsigned int msgid = pd_header_msgid_le(msg->header);
2144
2145 /*
2146 * USB PD standard, 6.6.1.2:
2147 * "... if MessageID value in a received Message is the
2148 * same as the stored value, the receiver shall return a
2149 * GoodCRC Message with that MessageID value and drop
2150 * the Message (this is a retry of an already received
2151 * Message). Note: this shall not apply to the Soft_Reset
2152 * Message which always has a MessageID value of zero."
2153 */
2154 if (msgid == port->rx_msgid && type != PD_CTRL_SOFT_RESET)
2155 goto done;
2156 port->rx_msgid = msgid;
2157
2158 /*
2159 * If both ends believe to be DFP/host, we have a data role
2160 * mismatch.
2161 */
2162 if (!!(le16_to_cpu(msg->header) & PD_HEADER_DATA_ROLE) ==
2163 (port->data_role == TYPEC_HOST)) {
2164 tcpm_log(port,
2165 "Data role mismatch, initiating error recovery");
2166 tcpm_set_state(port, ERROR_RECOVERY, 0);
2167 } else {
2168 if (msg->header & PD_HEADER_EXT_HDR)
2169 tcpm_pd_ext_msg_request(port, msg);
2170 else if (cnt)
2171 tcpm_pd_data_request(port, msg);
2172 else
2173 tcpm_pd_ctrl_request(port, msg);
2174 }
2175 }
2176
2177 done:
2178 mutex_unlock(&port->lock);
2179 kfree(event);
2180 }
2181
tcpm_pd_receive(struct tcpm_port * port,const struct pd_message * msg)2182 void tcpm_pd_receive(struct tcpm_port *port, const struct pd_message *msg)
2183 {
2184 struct pd_rx_event *event;
2185
2186 event = kzalloc(sizeof(*event), GFP_ATOMIC);
2187 if (!event)
2188 return;
2189
2190 kthread_init_work(&event->work, tcpm_pd_rx_handler);
2191 event->port = port;
2192 memcpy(&event->msg, msg, sizeof(*msg));
2193 kthread_queue_work(port->wq, &event->work);
2194 }
2195 EXPORT_SYMBOL_GPL(tcpm_pd_receive);
2196
tcpm_pd_send_control(struct tcpm_port * port,enum pd_ctrl_msg_type type)2197 static int tcpm_pd_send_control(struct tcpm_port *port,
2198 enum pd_ctrl_msg_type type)
2199 {
2200 struct pd_message msg;
2201
2202 memset(&msg, 0, sizeof(msg));
2203 msg.header = PD_HEADER_LE(type, port->pwr_role,
2204 port->data_role,
2205 port->negotiated_rev,
2206 port->message_id, 0);
2207
2208 return tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
2209 }
2210
2211 /*
2212 * Send queued message without affecting state.
2213 * Return true if state machine should go back to sleep,
2214 * false otherwise.
2215 */
tcpm_send_queued_message(struct tcpm_port * port)2216 static bool tcpm_send_queued_message(struct tcpm_port *port)
2217 {
2218 enum pd_msg_request queued_message;
2219
2220 do {
2221 queued_message = port->queued_message;
2222 port->queued_message = PD_MSG_NONE;
2223
2224 switch (queued_message) {
2225 case PD_MSG_CTRL_WAIT:
2226 tcpm_pd_send_control(port, PD_CTRL_WAIT);
2227 break;
2228 case PD_MSG_CTRL_REJECT:
2229 tcpm_pd_send_control(port, PD_CTRL_REJECT);
2230 break;
2231 case PD_MSG_CTRL_NOT_SUPP:
2232 tcpm_pd_send_control(port, PD_CTRL_NOT_SUPP);
2233 break;
2234 case PD_MSG_DATA_SINK_CAP:
2235 tcpm_pd_send_sink_caps(port);
2236 break;
2237 case PD_MSG_DATA_SOURCE_CAP:
2238 tcpm_pd_send_source_caps(port);
2239 break;
2240 default:
2241 break;
2242 }
2243 } while (port->queued_message != PD_MSG_NONE);
2244
2245 if (port->delayed_state != INVALID_STATE) {
2246 if (ktime_after(port->delayed_runtime, ktime_get())) {
2247 mod_tcpm_delayed_work(port, ktime_to_ms(ktime_sub(port->delayed_runtime,
2248 ktime_get())));
2249 return true;
2250 }
2251 port->delayed_state = INVALID_STATE;
2252 }
2253 return false;
2254 }
2255
tcpm_pd_check_request(struct tcpm_port * port)2256 static int tcpm_pd_check_request(struct tcpm_port *port)
2257 {
2258 u32 pdo, rdo = port->sink_request;
2259 unsigned int max, op, pdo_max, index;
2260 enum pd_pdo_type type;
2261
2262 index = rdo_index(rdo);
2263 if (!index || index > port->nr_src_pdo)
2264 return -EINVAL;
2265
2266 pdo = port->src_pdo[index - 1];
2267 type = pdo_type(pdo);
2268 switch (type) {
2269 case PDO_TYPE_FIXED:
2270 case PDO_TYPE_VAR:
2271 max = rdo_max_current(rdo);
2272 op = rdo_op_current(rdo);
2273 pdo_max = pdo_max_current(pdo);
2274
2275 if (op > pdo_max)
2276 return -EINVAL;
2277 if (max > pdo_max && !(rdo & RDO_CAP_MISMATCH))
2278 return -EINVAL;
2279
2280 if (type == PDO_TYPE_FIXED)
2281 tcpm_log(port,
2282 "Requested %u mV, %u mA for %u / %u mA",
2283 pdo_fixed_voltage(pdo), pdo_max, op, max);
2284 else
2285 tcpm_log(port,
2286 "Requested %u -> %u mV, %u mA for %u / %u mA",
2287 pdo_min_voltage(pdo), pdo_max_voltage(pdo),
2288 pdo_max, op, max);
2289 break;
2290 case PDO_TYPE_BATT:
2291 max = rdo_max_power(rdo);
2292 op = rdo_op_power(rdo);
2293 pdo_max = pdo_max_power(pdo);
2294
2295 if (op > pdo_max)
2296 return -EINVAL;
2297 if (max > pdo_max && !(rdo & RDO_CAP_MISMATCH))
2298 return -EINVAL;
2299 tcpm_log(port,
2300 "Requested %u -> %u mV, %u mW for %u / %u mW",
2301 pdo_min_voltage(pdo), pdo_max_voltage(pdo),
2302 pdo_max, op, max);
2303 break;
2304 default:
2305 return -EINVAL;
2306 }
2307
2308 port->op_vsafe5v = index == 1;
2309
2310 return 0;
2311 }
2312
2313 #define min_power(x, y) min(pdo_max_power(x), pdo_max_power(y))
2314 #define min_current(x, y) min(pdo_max_current(x), pdo_max_current(y))
2315
tcpm_pd_select_pdo(struct tcpm_port * port,int * sink_pdo,int * src_pdo)2316 static int tcpm_pd_select_pdo(struct tcpm_port *port, int *sink_pdo,
2317 int *src_pdo)
2318 {
2319 unsigned int i, j, max_src_mv = 0, min_src_mv = 0, max_mw = 0,
2320 max_mv = 0, src_mw = 0, src_ma = 0, max_snk_mv = 0,
2321 min_snk_mv = 0;
2322 int ret = -EINVAL;
2323
2324 port->pps_data.supported = false;
2325 port->usb_type = POWER_SUPPLY_USB_TYPE_PD;
2326 power_supply_changed(port->psy);
2327
2328 /*
2329 * Select the source PDO providing the most power which has a
2330 * matchig sink cap.
2331 */
2332 for (i = 0; i < port->nr_source_caps; i++) {
2333 u32 pdo = port->source_caps[i];
2334 enum pd_pdo_type type = pdo_type(pdo);
2335
2336 switch (type) {
2337 case PDO_TYPE_FIXED:
2338 max_src_mv = pdo_fixed_voltage(pdo);
2339 min_src_mv = max_src_mv;
2340 break;
2341 case PDO_TYPE_BATT:
2342 case PDO_TYPE_VAR:
2343 max_src_mv = pdo_max_voltage(pdo);
2344 min_src_mv = pdo_min_voltage(pdo);
2345 break;
2346 case PDO_TYPE_APDO:
2347 if (pdo_apdo_type(pdo) == APDO_TYPE_PPS) {
2348 port->pps_data.supported = true;
2349 port->usb_type =
2350 POWER_SUPPLY_USB_TYPE_PD_PPS;
2351 power_supply_changed(port->psy);
2352 }
2353 continue;
2354 default:
2355 tcpm_log(port, "Invalid source PDO type, ignoring");
2356 continue;
2357 }
2358
2359 switch (type) {
2360 case PDO_TYPE_FIXED:
2361 case PDO_TYPE_VAR:
2362 src_ma = pdo_max_current(pdo);
2363 src_mw = src_ma * min_src_mv / 1000;
2364 break;
2365 case PDO_TYPE_BATT:
2366 src_mw = pdo_max_power(pdo);
2367 break;
2368 case PDO_TYPE_APDO:
2369 continue;
2370 default:
2371 tcpm_log(port, "Invalid source PDO type, ignoring");
2372 continue;
2373 }
2374
2375 for (j = 0; j < port->nr_snk_pdo; j++) {
2376 pdo = port->snk_pdo[j];
2377
2378 switch (pdo_type(pdo)) {
2379 case PDO_TYPE_FIXED:
2380 max_snk_mv = pdo_fixed_voltage(pdo);
2381 min_snk_mv = max_snk_mv;
2382 break;
2383 case PDO_TYPE_BATT:
2384 case PDO_TYPE_VAR:
2385 max_snk_mv = pdo_max_voltage(pdo);
2386 min_snk_mv = pdo_min_voltage(pdo);
2387 break;
2388 case PDO_TYPE_APDO:
2389 continue;
2390 default:
2391 tcpm_log(port, "Invalid sink PDO type, ignoring");
2392 continue;
2393 }
2394
2395 if (max_src_mv <= max_snk_mv &&
2396 min_src_mv >= min_snk_mv) {
2397 /* Prefer higher voltages if available */
2398 if ((src_mw == max_mw && min_src_mv > max_mv) ||
2399 src_mw > max_mw) {
2400 *src_pdo = i;
2401 *sink_pdo = j;
2402 max_mw = src_mw;
2403 max_mv = min_src_mv;
2404 ret = 0;
2405 }
2406 }
2407 }
2408 }
2409
2410 return ret;
2411 }
2412
2413 #define min_pps_apdo_current(x, y) \
2414 min(pdo_pps_apdo_max_current(x), pdo_pps_apdo_max_current(y))
2415
tcpm_pd_select_pps_apdo(struct tcpm_port * port)2416 static unsigned int tcpm_pd_select_pps_apdo(struct tcpm_port *port)
2417 {
2418 unsigned int i, j, max_mw = 0, max_mv = 0;
2419 unsigned int min_src_mv, max_src_mv, src_ma, src_mw;
2420 unsigned int min_snk_mv, max_snk_mv;
2421 unsigned int max_op_mv;
2422 u32 pdo, src, snk;
2423 unsigned int src_pdo = 0, snk_pdo = 0;
2424
2425 /*
2426 * Select the source PPS APDO providing the most power while staying
2427 * within the board's limits. We skip the first PDO as this is always
2428 * 5V 3A.
2429 */
2430 for (i = 1; i < port->nr_source_caps; ++i) {
2431 pdo = port->source_caps[i];
2432
2433 switch (pdo_type(pdo)) {
2434 case PDO_TYPE_APDO:
2435 if (pdo_apdo_type(pdo) != APDO_TYPE_PPS) {
2436 tcpm_log(port, "Not PPS APDO (source), ignoring");
2437 continue;
2438 }
2439
2440 min_src_mv = pdo_pps_apdo_min_voltage(pdo);
2441 max_src_mv = pdo_pps_apdo_max_voltage(pdo);
2442 src_ma = pdo_pps_apdo_max_current(pdo);
2443 src_mw = (src_ma * max_src_mv) / 1000;
2444
2445 /*
2446 * Now search through the sink PDOs to find a matching
2447 * PPS APDO. Again skip the first sink PDO as this will
2448 * always be 5V 3A.
2449 */
2450 for (j = 1; j < port->nr_snk_pdo; j++) {
2451 pdo = port->snk_pdo[j];
2452
2453 switch (pdo_type(pdo)) {
2454 case PDO_TYPE_APDO:
2455 if (pdo_apdo_type(pdo) != APDO_TYPE_PPS) {
2456 tcpm_log(port,
2457 "Not PPS APDO (sink), ignoring");
2458 continue;
2459 }
2460
2461 min_snk_mv =
2462 pdo_pps_apdo_min_voltage(pdo);
2463 max_snk_mv =
2464 pdo_pps_apdo_max_voltage(pdo);
2465 break;
2466 default:
2467 tcpm_log(port,
2468 "Not APDO type (sink), ignoring");
2469 continue;
2470 }
2471
2472 if (min_src_mv <= max_snk_mv &&
2473 max_src_mv >= min_snk_mv) {
2474 max_op_mv = min(max_src_mv, max_snk_mv);
2475 src_mw = (max_op_mv * src_ma) / 1000;
2476 /* Prefer higher voltages if available */
2477 if ((src_mw == max_mw &&
2478 max_op_mv > max_mv) ||
2479 src_mw > max_mw) {
2480 src_pdo = i;
2481 snk_pdo = j;
2482 max_mw = src_mw;
2483 max_mv = max_op_mv;
2484 }
2485 }
2486 }
2487
2488 break;
2489 default:
2490 tcpm_log(port, "Not APDO type (source), ignoring");
2491 continue;
2492 }
2493 }
2494
2495 if (src_pdo) {
2496 src = port->source_caps[src_pdo];
2497 snk = port->snk_pdo[snk_pdo];
2498
2499 port->pps_data.req_min_volt = max(pdo_pps_apdo_min_voltage(src),
2500 pdo_pps_apdo_min_voltage(snk));
2501 port->pps_data.req_max_volt = min(pdo_pps_apdo_max_voltage(src),
2502 pdo_pps_apdo_max_voltage(snk));
2503 port->pps_data.req_max_curr = min_pps_apdo_current(src, snk);
2504 port->pps_data.req_out_volt = min(port->pps_data.req_max_volt,
2505 max(port->pps_data.req_min_volt,
2506 port->pps_data.req_out_volt));
2507 port->pps_data.req_op_curr = min(port->pps_data.req_max_curr,
2508 port->pps_data.req_op_curr);
2509 }
2510
2511 return src_pdo;
2512 }
2513
tcpm_pd_build_request(struct tcpm_port * port,u32 * rdo)2514 static int tcpm_pd_build_request(struct tcpm_port *port, u32 *rdo)
2515 {
2516 unsigned int mv, ma, mw, flags;
2517 unsigned int max_ma, max_mw;
2518 enum pd_pdo_type type;
2519 u32 pdo, matching_snk_pdo;
2520 int src_pdo_index = 0;
2521 int snk_pdo_index = 0;
2522 int ret;
2523
2524 ret = tcpm_pd_select_pdo(port, &snk_pdo_index, &src_pdo_index);
2525 if (ret < 0)
2526 return ret;
2527
2528 pdo = port->source_caps[src_pdo_index];
2529 matching_snk_pdo = port->snk_pdo[snk_pdo_index];
2530 type = pdo_type(pdo);
2531
2532 switch (type) {
2533 case PDO_TYPE_FIXED:
2534 mv = pdo_fixed_voltage(pdo);
2535 break;
2536 case PDO_TYPE_BATT:
2537 case PDO_TYPE_VAR:
2538 mv = pdo_min_voltage(pdo);
2539 break;
2540 default:
2541 tcpm_log(port, "Invalid PDO selected!");
2542 return -EINVAL;
2543 }
2544
2545 /* Select maximum available current within the sink pdo's limit */
2546 if (type == PDO_TYPE_BATT) {
2547 mw = min_power(pdo, matching_snk_pdo);
2548 ma = 1000 * mw / mv;
2549 } else {
2550 ma = min_current(pdo, matching_snk_pdo);
2551 mw = ma * mv / 1000;
2552 }
2553
2554 flags = RDO_USB_COMM | RDO_NO_SUSPEND;
2555
2556 /* Set mismatch bit if offered power is less than operating power */
2557 max_ma = ma;
2558 max_mw = mw;
2559 if (mw < port->operating_snk_mw) {
2560 flags |= RDO_CAP_MISMATCH;
2561 if (type == PDO_TYPE_BATT &&
2562 (pdo_max_power(matching_snk_pdo) > pdo_max_power(pdo)))
2563 max_mw = pdo_max_power(matching_snk_pdo);
2564 else if (pdo_max_current(matching_snk_pdo) >
2565 pdo_max_current(pdo))
2566 max_ma = pdo_max_current(matching_snk_pdo);
2567 }
2568
2569 tcpm_log(port, "cc=%d cc1=%d cc2=%d vbus=%d vconn=%s polarity=%d",
2570 port->cc_req, port->cc1, port->cc2, port->vbus_source,
2571 port->vconn_role == TYPEC_SOURCE ? "source" : "sink",
2572 port->polarity);
2573
2574 if (type == PDO_TYPE_BATT) {
2575 *rdo = RDO_BATT(src_pdo_index + 1, mw, max_mw, flags);
2576
2577 tcpm_log(port, "Requesting PDO %d: %u mV, %u mW%s",
2578 src_pdo_index, mv, mw,
2579 flags & RDO_CAP_MISMATCH ? " [mismatch]" : "");
2580 } else {
2581 *rdo = RDO_FIXED(src_pdo_index + 1, ma, max_ma, flags);
2582
2583 tcpm_log(port, "Requesting PDO %d: %u mV, %u mA%s",
2584 src_pdo_index, mv, ma,
2585 flags & RDO_CAP_MISMATCH ? " [mismatch]" : "");
2586 }
2587
2588 port->req_current_limit = ma;
2589 port->req_supply_voltage = mv;
2590
2591 return 0;
2592 }
2593
tcpm_pd_send_request(struct tcpm_port * port)2594 static int tcpm_pd_send_request(struct tcpm_port *port)
2595 {
2596 struct pd_message msg;
2597 int ret;
2598 u32 rdo;
2599
2600 ret = tcpm_pd_build_request(port, &rdo);
2601 if (ret < 0)
2602 return ret;
2603
2604 memset(&msg, 0, sizeof(msg));
2605 msg.header = PD_HEADER_LE(PD_DATA_REQUEST,
2606 port->pwr_role,
2607 port->data_role,
2608 port->negotiated_rev,
2609 port->message_id, 1);
2610 msg.payload[0] = cpu_to_le32(rdo);
2611
2612 return tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
2613 }
2614
tcpm_pd_build_pps_request(struct tcpm_port * port,u32 * rdo)2615 static int tcpm_pd_build_pps_request(struct tcpm_port *port, u32 *rdo)
2616 {
2617 unsigned int out_mv, op_ma, op_mw, max_mv, max_ma, flags;
2618 enum pd_pdo_type type;
2619 unsigned int src_pdo_index;
2620 u32 pdo;
2621
2622 src_pdo_index = tcpm_pd_select_pps_apdo(port);
2623 if (!src_pdo_index)
2624 return -EOPNOTSUPP;
2625
2626 pdo = port->source_caps[src_pdo_index];
2627 type = pdo_type(pdo);
2628
2629 switch (type) {
2630 case PDO_TYPE_APDO:
2631 if (pdo_apdo_type(pdo) != APDO_TYPE_PPS) {
2632 tcpm_log(port, "Invalid APDO selected!");
2633 return -EINVAL;
2634 }
2635 max_mv = port->pps_data.req_max_volt;
2636 max_ma = port->pps_data.req_max_curr;
2637 out_mv = port->pps_data.req_out_volt;
2638 op_ma = port->pps_data.req_op_curr;
2639 break;
2640 default:
2641 tcpm_log(port, "Invalid PDO selected!");
2642 return -EINVAL;
2643 }
2644
2645 flags = RDO_USB_COMM | RDO_NO_SUSPEND;
2646
2647 op_mw = (op_ma * out_mv) / 1000;
2648 if (op_mw < port->operating_snk_mw) {
2649 /*
2650 * Try raising current to meet power needs. If that's not enough
2651 * then try upping the voltage. If that's still not enough
2652 * then we've obviously chosen a PPS APDO which really isn't
2653 * suitable so abandon ship.
2654 */
2655 op_ma = (port->operating_snk_mw * 1000) / out_mv;
2656 if ((port->operating_snk_mw * 1000) % out_mv)
2657 ++op_ma;
2658 op_ma += RDO_PROG_CURR_MA_STEP - (op_ma % RDO_PROG_CURR_MA_STEP);
2659
2660 if (op_ma > max_ma) {
2661 op_ma = max_ma;
2662 out_mv = (port->operating_snk_mw * 1000) / op_ma;
2663 if ((port->operating_snk_mw * 1000) % op_ma)
2664 ++out_mv;
2665 out_mv += RDO_PROG_VOLT_MV_STEP -
2666 (out_mv % RDO_PROG_VOLT_MV_STEP);
2667
2668 if (out_mv > max_mv) {
2669 tcpm_log(port, "Invalid PPS APDO selected!");
2670 return -EINVAL;
2671 }
2672 }
2673 }
2674
2675 tcpm_log(port, "cc=%d cc1=%d cc2=%d vbus=%d vconn=%s polarity=%d",
2676 port->cc_req, port->cc1, port->cc2, port->vbus_source,
2677 port->vconn_role == TYPEC_SOURCE ? "source" : "sink",
2678 port->polarity);
2679
2680 *rdo = RDO_PROG(src_pdo_index + 1, out_mv, op_ma, flags);
2681
2682 tcpm_log(port, "Requesting APDO %d: %u mV, %u mA",
2683 src_pdo_index, out_mv, op_ma);
2684
2685 port->pps_data.req_op_curr = op_ma;
2686 port->pps_data.req_out_volt = out_mv;
2687
2688 return 0;
2689 }
2690
tcpm_pd_send_pps_request(struct tcpm_port * port)2691 static int tcpm_pd_send_pps_request(struct tcpm_port *port)
2692 {
2693 struct pd_message msg;
2694 int ret;
2695 u32 rdo;
2696
2697 ret = tcpm_pd_build_pps_request(port, &rdo);
2698 if (ret < 0)
2699 return ret;
2700
2701 memset(&msg, 0, sizeof(msg));
2702 msg.header = PD_HEADER_LE(PD_DATA_REQUEST,
2703 port->pwr_role,
2704 port->data_role,
2705 port->negotiated_rev,
2706 port->message_id, 1);
2707 msg.payload[0] = cpu_to_le32(rdo);
2708
2709 return tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
2710 }
2711
tcpm_set_vbus(struct tcpm_port * port,bool enable)2712 static int tcpm_set_vbus(struct tcpm_port *port, bool enable)
2713 {
2714 int ret;
2715
2716 if (enable && port->vbus_charge)
2717 return -EINVAL;
2718
2719 tcpm_log(port, "vbus:=%d charge=%d", enable, port->vbus_charge);
2720
2721 ret = port->tcpc->set_vbus(port->tcpc, enable, port->vbus_charge);
2722 if (ret < 0)
2723 return ret;
2724
2725 port->vbus_source = enable;
2726 return 0;
2727 }
2728
tcpm_set_charge(struct tcpm_port * port,bool charge)2729 static int tcpm_set_charge(struct tcpm_port *port, bool charge)
2730 {
2731 int ret;
2732
2733 if (charge && port->vbus_source)
2734 return -EINVAL;
2735
2736 if (charge != port->vbus_charge) {
2737 tcpm_log(port, "vbus=%d charge:=%d", port->vbus_source, charge);
2738 ret = port->tcpc->set_vbus(port->tcpc, port->vbus_source,
2739 charge);
2740 if (ret < 0)
2741 return ret;
2742 }
2743 port->vbus_charge = charge;
2744 power_supply_changed(port->psy);
2745 return 0;
2746 }
2747
tcpm_start_toggling(struct tcpm_port * port,enum typec_cc_status cc)2748 static bool tcpm_start_toggling(struct tcpm_port *port, enum typec_cc_status cc)
2749 {
2750 int ret;
2751
2752 if (!port->tcpc->start_toggling)
2753 return false;
2754
2755 tcpm_log_force(port, "Start toggling");
2756 ret = port->tcpc->start_toggling(port->tcpc, port->port_type, cc);
2757 return ret == 0;
2758 }
2759
tcpm_set_cc(struct tcpm_port * port,enum typec_cc_status cc)2760 static void tcpm_set_cc(struct tcpm_port *port, enum typec_cc_status cc)
2761 {
2762 tcpm_log(port, "cc:=%d", cc);
2763 port->cc_req = cc;
2764 port->tcpc->set_cc(port->tcpc, cc);
2765 }
2766
tcpm_init_vbus(struct tcpm_port * port)2767 static int tcpm_init_vbus(struct tcpm_port *port)
2768 {
2769 int ret;
2770
2771 ret = port->tcpc->set_vbus(port->tcpc, false, false);
2772 port->vbus_source = false;
2773 port->vbus_charge = false;
2774 return ret;
2775 }
2776
tcpm_init_vconn(struct tcpm_port * port)2777 static int tcpm_init_vconn(struct tcpm_port *port)
2778 {
2779 int ret;
2780
2781 ret = port->tcpc->set_vconn(port->tcpc, false);
2782 port->vconn_role = TYPEC_SINK;
2783 return ret;
2784 }
2785
tcpm_typec_connect(struct tcpm_port * port)2786 static void tcpm_typec_connect(struct tcpm_port *port)
2787 {
2788 if (!port->connected) {
2789 /* Make sure we don't report stale identity information */
2790 memset(&port->partner_ident, 0, sizeof(port->partner_ident));
2791 port->partner_desc.usb_pd = port->pd_capable;
2792 if (tcpm_port_is_debug(port))
2793 port->partner_desc.accessory = TYPEC_ACCESSORY_DEBUG;
2794 else if (tcpm_port_is_audio(port))
2795 port->partner_desc.accessory = TYPEC_ACCESSORY_AUDIO;
2796 else
2797 port->partner_desc.accessory = TYPEC_ACCESSORY_NONE;
2798 port->partner = typec_register_partner(port->typec_port,
2799 &port->partner_desc);
2800 port->connected = true;
2801 }
2802 }
2803
tcpm_src_attach(struct tcpm_port * port)2804 static int tcpm_src_attach(struct tcpm_port *port)
2805 {
2806 enum typec_cc_polarity polarity =
2807 port->cc2 == TYPEC_CC_RD ? TYPEC_POLARITY_CC2
2808 : TYPEC_POLARITY_CC1;
2809 int ret;
2810
2811 if (port->attached)
2812 return 0;
2813
2814 ret = tcpm_set_polarity(port, polarity);
2815 if (ret < 0)
2816 return ret;
2817
2818 ret = tcpm_set_roles(port, true, TYPEC_SOURCE,
2819 tcpm_data_role_for_source(port));
2820 if (ret < 0)
2821 return ret;
2822
2823 ret = port->tcpc->set_pd_rx(port->tcpc, true);
2824 if (ret < 0)
2825 goto out_disable_mux;
2826
2827 /*
2828 * USB Type-C specification, version 1.2,
2829 * chapter 4.5.2.2.8.1 (Attached.SRC Requirements)
2830 * Enable VCONN only if the non-RD port is set to RA.
2831 */
2832 if ((polarity == TYPEC_POLARITY_CC1 && port->cc2 == TYPEC_CC_RA) ||
2833 (polarity == TYPEC_POLARITY_CC2 && port->cc1 == TYPEC_CC_RA)) {
2834 ret = tcpm_set_vconn(port, true);
2835 if (ret < 0)
2836 goto out_disable_pd;
2837 }
2838
2839 ret = tcpm_set_vbus(port, true);
2840 if (ret < 0)
2841 goto out_disable_vconn;
2842
2843 port->pd_capable = false;
2844
2845 port->partner = NULL;
2846
2847 port->attached = true;
2848 port->send_discover = true;
2849
2850 return 0;
2851
2852 out_disable_vconn:
2853 tcpm_set_vconn(port, false);
2854 out_disable_pd:
2855 port->tcpc->set_pd_rx(port->tcpc, false);
2856 out_disable_mux:
2857 tcpm_mux_set(port, TYPEC_STATE_SAFE, USB_ROLE_NONE,
2858 TYPEC_ORIENTATION_NONE);
2859 return ret;
2860 }
2861
tcpm_typec_disconnect(struct tcpm_port * port)2862 static void tcpm_typec_disconnect(struct tcpm_port *port)
2863 {
2864 if (port->connected) {
2865 typec_unregister_partner(port->partner);
2866 port->partner = NULL;
2867 port->connected = false;
2868 }
2869 }
2870
tcpm_unregister_altmodes(struct tcpm_port * port)2871 static void tcpm_unregister_altmodes(struct tcpm_port *port)
2872 {
2873 struct pd_mode_data *modep = &port->mode_data;
2874 int i;
2875
2876 for (i = 0; i < modep->altmodes; i++) {
2877 typec_unregister_altmode(port->partner_altmode[i]);
2878 port->partner_altmode[i] = NULL;
2879 }
2880
2881 memset(modep, 0, sizeof(*modep));
2882 }
2883
tcpm_reset_port(struct tcpm_port * port)2884 static void tcpm_reset_port(struct tcpm_port *port)
2885 {
2886 tcpm_unregister_altmodes(port);
2887 tcpm_typec_disconnect(port);
2888 port->attached = false;
2889 port->pd_capable = false;
2890 port->pps_data.supported = false;
2891
2892 /*
2893 * First Rx ID should be 0; set this to a sentinel of -1 so that
2894 * we can check tcpm_pd_rx_handler() if we had seen it before.
2895 */
2896 port->rx_msgid = -1;
2897
2898 port->tcpc->set_pd_rx(port->tcpc, false);
2899 tcpm_init_vbus(port); /* also disables charging */
2900 tcpm_init_vconn(port);
2901 tcpm_set_current_limit(port, 0, 0);
2902 tcpm_set_polarity(port, TYPEC_POLARITY_CC1);
2903 tcpm_mux_set(port, TYPEC_STATE_SAFE, USB_ROLE_NONE,
2904 TYPEC_ORIENTATION_NONE);
2905 tcpm_set_attached_state(port, false);
2906 port->try_src_count = 0;
2907 port->try_snk_count = 0;
2908 port->usb_type = POWER_SUPPLY_USB_TYPE_C;
2909 power_supply_changed(port->psy);
2910 port->nr_sink_caps = 0;
2911 port->sink_cap_done = false;
2912 if (port->tcpc->enable_frs)
2913 port->tcpc->enable_frs(port->tcpc, false);
2914 }
2915
tcpm_detach(struct tcpm_port * port)2916 static void tcpm_detach(struct tcpm_port *port)
2917 {
2918 if (tcpm_port_is_disconnected(port))
2919 port->hard_reset_count = 0;
2920
2921 if (!port->attached)
2922 return;
2923
2924 if (port->tcpc->set_bist_data) {
2925 tcpm_log(port, "disable BIST MODE TESTDATA");
2926 port->tcpc->set_bist_data(port->tcpc, false);
2927 }
2928
2929 tcpm_reset_port(port);
2930 }
2931
tcpm_src_detach(struct tcpm_port * port)2932 static void tcpm_src_detach(struct tcpm_port *port)
2933 {
2934 tcpm_detach(port);
2935 }
2936
tcpm_snk_attach(struct tcpm_port * port)2937 static int tcpm_snk_attach(struct tcpm_port *port)
2938 {
2939 int ret;
2940
2941 if (port->attached)
2942 return 0;
2943
2944 ret = tcpm_set_polarity(port, port->cc2 != TYPEC_CC_OPEN ?
2945 TYPEC_POLARITY_CC2 : TYPEC_POLARITY_CC1);
2946 if (ret < 0)
2947 return ret;
2948
2949 ret = tcpm_set_roles(port, true, TYPEC_SINK,
2950 tcpm_data_role_for_sink(port));
2951 if (ret < 0)
2952 return ret;
2953
2954 port->pd_capable = false;
2955
2956 port->partner = NULL;
2957
2958 port->attached = true;
2959 port->send_discover = true;
2960
2961 return 0;
2962 }
2963
tcpm_snk_detach(struct tcpm_port * port)2964 static void tcpm_snk_detach(struct tcpm_port *port)
2965 {
2966 tcpm_detach(port);
2967 }
2968
tcpm_acc_attach(struct tcpm_port * port)2969 static int tcpm_acc_attach(struct tcpm_port *port)
2970 {
2971 int ret;
2972
2973 if (port->attached)
2974 return 0;
2975
2976 ret = tcpm_set_roles(port, true, TYPEC_SOURCE,
2977 tcpm_data_role_for_source(port));
2978 if (ret < 0)
2979 return ret;
2980
2981 port->partner = NULL;
2982
2983 tcpm_typec_connect(port);
2984
2985 port->attached = true;
2986
2987 return 0;
2988 }
2989
tcpm_acc_detach(struct tcpm_port * port)2990 static void tcpm_acc_detach(struct tcpm_port *port)
2991 {
2992 tcpm_detach(port);
2993 }
2994
hard_reset_state(struct tcpm_port * port)2995 static inline enum tcpm_state hard_reset_state(struct tcpm_port *port)
2996 {
2997 if (port->hard_reset_count < PD_N_HARD_RESET_COUNT)
2998 return HARD_RESET_SEND;
2999 if (port->pd_capable)
3000 return ERROR_RECOVERY;
3001 if (port->pwr_role == TYPEC_SOURCE)
3002 return SRC_UNATTACHED;
3003 if (port->state == SNK_WAIT_CAPABILITIES)
3004 return SNK_READY;
3005 return SNK_UNATTACHED;
3006 }
3007
unattached_state(struct tcpm_port * port)3008 static inline enum tcpm_state unattached_state(struct tcpm_port *port)
3009 {
3010 if (port->port_type == TYPEC_PORT_DRP) {
3011 if (port->pwr_role == TYPEC_SOURCE)
3012 return SRC_UNATTACHED;
3013 else
3014 return SNK_UNATTACHED;
3015 } else if (port->port_type == TYPEC_PORT_SRC) {
3016 return SRC_UNATTACHED;
3017 }
3018
3019 return SNK_UNATTACHED;
3020 }
3021
tcpm_check_send_discover(struct tcpm_port * port)3022 static void tcpm_check_send_discover(struct tcpm_port *port)
3023 {
3024 if (port->data_role == TYPEC_HOST && port->send_discover &&
3025 port->pd_capable) {
3026 tcpm_send_vdm(port, USB_SID_PD, CMD_DISCOVER_IDENT, NULL, 0);
3027 port->send_discover = false;
3028 }
3029 }
3030
tcpm_swap_complete(struct tcpm_port * port,int result)3031 static void tcpm_swap_complete(struct tcpm_port *port, int result)
3032 {
3033 if (port->swap_pending) {
3034 port->swap_status = result;
3035 port->swap_pending = false;
3036 port->non_pd_role_swap = false;
3037 complete(&port->swap_complete);
3038 }
3039 }
3040
tcpm_get_pwr_opmode(enum typec_cc_status cc)3041 static enum typec_pwr_opmode tcpm_get_pwr_opmode(enum typec_cc_status cc)
3042 {
3043 switch (cc) {
3044 case TYPEC_CC_RP_1_5:
3045 return TYPEC_PWR_MODE_1_5A;
3046 case TYPEC_CC_RP_3_0:
3047 return TYPEC_PWR_MODE_3_0A;
3048 case TYPEC_CC_RP_DEF:
3049 default:
3050 return TYPEC_PWR_MODE_USB;
3051 }
3052 }
3053
run_state_machine(struct tcpm_port * port)3054 static void run_state_machine(struct tcpm_port *port)
3055 {
3056 int ret;
3057 enum typec_pwr_opmode opmode;
3058 unsigned int msecs;
3059
3060 port->enter_state = port->state;
3061 switch (port->state) {
3062 case TOGGLING:
3063 break;
3064 /* SRC states */
3065 case SRC_UNATTACHED:
3066 if (!port->non_pd_role_swap)
3067 tcpm_swap_complete(port, -ENOTCONN);
3068 tcpm_src_detach(port);
3069 if (tcpm_start_toggling(port, tcpm_rp_cc(port))) {
3070 tcpm_set_state(port, TOGGLING, 0);
3071 break;
3072 }
3073 tcpm_set_cc(port, tcpm_rp_cc(port));
3074 if (port->port_type == TYPEC_PORT_DRP)
3075 tcpm_set_state(port, SNK_UNATTACHED, PD_T_DRP_SNK);
3076 break;
3077 case SRC_ATTACH_WAIT:
3078 if (tcpm_port_is_debug(port))
3079 tcpm_set_state(port, DEBUG_ACC_ATTACHED,
3080 PD_T_CC_DEBOUNCE);
3081 else if (tcpm_port_is_audio(port))
3082 tcpm_set_state(port, AUDIO_ACC_ATTACHED,
3083 PD_T_CC_DEBOUNCE);
3084 else if (tcpm_port_is_source(port))
3085 tcpm_set_state(port,
3086 tcpm_try_snk(port) ? SNK_TRY
3087 : SRC_ATTACHED,
3088 PD_T_CC_DEBOUNCE);
3089 break;
3090
3091 case SNK_TRY:
3092 port->try_snk_count++;
3093 /*
3094 * Requirements:
3095 * - Do not drive vconn or vbus
3096 * - Terminate CC pins (both) to Rd
3097 * Action:
3098 * - Wait for tDRPTry (PD_T_DRP_TRY).
3099 * Until then, ignore any state changes.
3100 */
3101 tcpm_set_cc(port, TYPEC_CC_RD);
3102 tcpm_set_state(port, SNK_TRY_WAIT, PD_T_DRP_TRY);
3103 break;
3104 case SNK_TRY_WAIT:
3105 if (tcpm_port_is_sink(port)) {
3106 tcpm_set_state(port, SNK_TRY_WAIT_DEBOUNCE, 0);
3107 } else {
3108 tcpm_set_state(port, SRC_TRYWAIT, 0);
3109 port->max_wait = 0;
3110 }
3111 break;
3112 case SNK_TRY_WAIT_DEBOUNCE:
3113 tcpm_set_state(port, SNK_TRY_WAIT_DEBOUNCE_CHECK_VBUS,
3114 PD_T_PD_DEBOUNCE);
3115 break;
3116 case SNK_TRY_WAIT_DEBOUNCE_CHECK_VBUS:
3117 if (port->vbus_present && tcpm_port_is_sink(port)) {
3118 tcpm_set_state(port, SNK_ATTACHED, 0);
3119 } else {
3120 tcpm_set_state(port, SRC_TRYWAIT, 0);
3121 port->max_wait = 0;
3122 }
3123 break;
3124 case SRC_TRYWAIT:
3125 tcpm_set_cc(port, tcpm_rp_cc(port));
3126 if (port->max_wait == 0) {
3127 port->max_wait = jiffies +
3128 msecs_to_jiffies(PD_T_DRP_TRY);
3129 tcpm_set_state(port, SRC_TRYWAIT_UNATTACHED,
3130 PD_T_DRP_TRY);
3131 } else {
3132 if (time_is_after_jiffies(port->max_wait))
3133 tcpm_set_state(port, SRC_TRYWAIT_UNATTACHED,
3134 jiffies_to_msecs(port->max_wait -
3135 jiffies));
3136 else
3137 tcpm_set_state(port, SNK_UNATTACHED, 0);
3138 }
3139 break;
3140 case SRC_TRYWAIT_DEBOUNCE:
3141 tcpm_set_state(port, SRC_ATTACHED, PD_T_CC_DEBOUNCE);
3142 break;
3143 case SRC_TRYWAIT_UNATTACHED:
3144 tcpm_set_state(port, SNK_UNATTACHED, 0);
3145 break;
3146
3147 case SRC_ATTACHED:
3148 ret = tcpm_src_attach(port);
3149 tcpm_set_state(port, SRC_UNATTACHED,
3150 ret < 0 ? 0 : PD_T_PS_SOURCE_ON);
3151 break;
3152 case SRC_STARTUP:
3153 opmode = tcpm_get_pwr_opmode(tcpm_rp_cc(port));
3154 typec_set_pwr_opmode(port->typec_port, opmode);
3155 port->pwr_opmode = TYPEC_PWR_MODE_USB;
3156 port->caps_count = 0;
3157 port->negotiated_rev = PD_MAX_REV;
3158 port->message_id = 0;
3159 port->rx_msgid = -1;
3160 port->explicit_contract = false;
3161 tcpm_set_state(port, SRC_SEND_CAPABILITIES, 0);
3162 break;
3163 case SRC_SEND_CAPABILITIES:
3164 port->caps_count++;
3165 if (port->caps_count > PD_N_CAPS_COUNT) {
3166 tcpm_set_state(port, SRC_READY, 0);
3167 break;
3168 }
3169 ret = tcpm_pd_send_source_caps(port);
3170 if (ret < 0) {
3171 tcpm_set_state(port, SRC_SEND_CAPABILITIES,
3172 PD_T_SEND_SOURCE_CAP);
3173 } else {
3174 /*
3175 * Per standard, we should clear the reset counter here.
3176 * However, that can result in state machine hang-ups.
3177 * Reset it only in READY state to improve stability.
3178 */
3179 /* port->hard_reset_count = 0; */
3180 port->caps_count = 0;
3181 port->pd_capable = true;
3182 tcpm_set_state_cond(port, SRC_SEND_CAPABILITIES_TIMEOUT,
3183 PD_T_SEND_SOURCE_CAP);
3184 }
3185 break;
3186 case SRC_SEND_CAPABILITIES_TIMEOUT:
3187 /*
3188 * Error recovery for a PD_DATA_SOURCE_CAP reply timeout.
3189 *
3190 * PD 2.0 sinks are supposed to accept src-capabilities with a
3191 * 3.0 header and simply ignore any src PDOs which the sink does
3192 * not understand such as PPS but some 2.0 sinks instead ignore
3193 * the entire PD_DATA_SOURCE_CAP message, causing contract
3194 * negotiation to fail.
3195 *
3196 * After PD_N_HARD_RESET_COUNT hard-reset attempts, we try
3197 * sending src-capabilities with a lower PD revision to
3198 * make these broken sinks work.
3199 */
3200 if (port->hard_reset_count < PD_N_HARD_RESET_COUNT) {
3201 tcpm_set_state(port, HARD_RESET_SEND, 0);
3202 } else if (port->negotiated_rev > PD_REV20) {
3203 port->negotiated_rev--;
3204 port->hard_reset_count = 0;
3205 tcpm_set_state(port, SRC_SEND_CAPABILITIES, 0);
3206 } else {
3207 tcpm_set_state(port, hard_reset_state(port), 0);
3208 }
3209 break;
3210 case SRC_NEGOTIATE_CAPABILITIES:
3211 ret = tcpm_pd_check_request(port);
3212 if (ret < 0) {
3213 tcpm_pd_send_control(port, PD_CTRL_REJECT);
3214 if (!port->explicit_contract) {
3215 tcpm_set_state(port,
3216 SRC_WAIT_NEW_CAPABILITIES, 0);
3217 } else {
3218 tcpm_set_state(port, SRC_READY, 0);
3219 }
3220 } else {
3221 tcpm_pd_send_control(port, PD_CTRL_ACCEPT);
3222 tcpm_set_state(port, SRC_TRANSITION_SUPPLY,
3223 PD_T_SRC_TRANSITION);
3224 }
3225 break;
3226 case SRC_TRANSITION_SUPPLY:
3227 /* XXX: regulator_set_voltage(vbus, ...) */
3228 tcpm_pd_send_control(port, PD_CTRL_PS_RDY);
3229 port->explicit_contract = true;
3230 typec_set_pwr_opmode(port->typec_port, TYPEC_PWR_MODE_PD);
3231 port->pwr_opmode = TYPEC_PWR_MODE_PD;
3232 tcpm_set_state_cond(port, SRC_READY, 0);
3233 break;
3234 case SRC_READY:
3235 #if 1
3236 port->hard_reset_count = 0;
3237 #endif
3238 port->try_src_count = 0;
3239
3240 tcpm_swap_complete(port, 0);
3241 tcpm_typec_connect(port);
3242
3243 tcpm_check_send_discover(port);
3244 /*
3245 * 6.3.5
3246 * Sending ping messages is not necessary if
3247 * - the source operates at vSafe5V
3248 * or
3249 * - The system is not operating in PD mode
3250 * or
3251 * - Both partners are connected using a Type-C connector
3252 *
3253 * There is no actual need to send PD messages since the local
3254 * port type-c and the spec does not clearly say whether PD is
3255 * possible when type-c is connected to Type-A/B
3256 */
3257 break;
3258 case SRC_WAIT_NEW_CAPABILITIES:
3259 /* Nothing to do... */
3260 break;
3261
3262 /* SNK states */
3263 case SNK_UNATTACHED:
3264 if (!port->non_pd_role_swap)
3265 tcpm_swap_complete(port, -ENOTCONN);
3266 tcpm_pps_complete(port, -ENOTCONN);
3267 tcpm_snk_detach(port);
3268 if (tcpm_start_toggling(port, TYPEC_CC_RD)) {
3269 tcpm_set_state(port, TOGGLING, 0);
3270 break;
3271 }
3272 tcpm_set_cc(port, TYPEC_CC_RD);
3273 if (port->port_type == TYPEC_PORT_DRP)
3274 tcpm_set_state(port, SRC_UNATTACHED, PD_T_DRP_SRC);
3275 break;
3276 case SNK_ATTACH_WAIT:
3277 if ((port->cc1 == TYPEC_CC_OPEN &&
3278 port->cc2 != TYPEC_CC_OPEN) ||
3279 (port->cc1 != TYPEC_CC_OPEN &&
3280 port->cc2 == TYPEC_CC_OPEN))
3281 tcpm_set_state(port, SNK_DEBOUNCED,
3282 PD_T_CC_DEBOUNCE);
3283 else if (tcpm_port_is_disconnected(port))
3284 tcpm_set_state(port, SNK_UNATTACHED,
3285 PD_T_PD_DEBOUNCE);
3286 break;
3287 case SNK_DEBOUNCED:
3288 if (tcpm_port_is_disconnected(port))
3289 tcpm_set_state(port, SNK_UNATTACHED,
3290 PD_T_PD_DEBOUNCE);
3291 else if (port->vbus_present)
3292 tcpm_set_state(port,
3293 tcpm_try_src(port) ? SRC_TRY
3294 : SNK_ATTACHED,
3295 0);
3296 break;
3297 case SRC_TRY:
3298 port->try_src_count++;
3299 tcpm_set_cc(port, tcpm_rp_cc(port));
3300 port->max_wait = 0;
3301 tcpm_set_state(port, SRC_TRY_WAIT, 0);
3302 break;
3303 case SRC_TRY_WAIT:
3304 if (port->max_wait == 0) {
3305 port->max_wait = jiffies +
3306 msecs_to_jiffies(PD_T_DRP_TRY);
3307 msecs = PD_T_DRP_TRY;
3308 } else {
3309 if (time_is_after_jiffies(port->max_wait))
3310 msecs = jiffies_to_msecs(port->max_wait -
3311 jiffies);
3312 else
3313 msecs = 0;
3314 }
3315 tcpm_set_state(port, SNK_TRYWAIT, msecs);
3316 break;
3317 case SRC_TRY_DEBOUNCE:
3318 tcpm_set_state(port, SRC_ATTACHED, PD_T_PD_DEBOUNCE);
3319 break;
3320 case SNK_TRYWAIT:
3321 tcpm_set_cc(port, TYPEC_CC_RD);
3322 tcpm_set_state(port, SNK_TRYWAIT_VBUS, PD_T_CC_DEBOUNCE);
3323 break;
3324 case SNK_TRYWAIT_VBUS:
3325 /*
3326 * TCPM stays in this state indefinitely until VBUS
3327 * is detected as long as Rp is not detected for
3328 * more than a time period of tPDDebounce.
3329 */
3330 if (port->vbus_present && tcpm_port_is_sink(port)) {
3331 tcpm_set_state(port, SNK_ATTACHED, 0);
3332 break;
3333 }
3334 if (!tcpm_port_is_sink(port))
3335 tcpm_set_state(port, SNK_TRYWAIT_DEBOUNCE, 0);
3336 break;
3337 case SNK_TRYWAIT_DEBOUNCE:
3338 tcpm_set_state(port, SNK_UNATTACHED, PD_T_PD_DEBOUNCE);
3339 break;
3340 case SNK_ATTACHED:
3341 ret = tcpm_snk_attach(port);
3342 if (ret < 0)
3343 tcpm_set_state(port, SNK_UNATTACHED, 0);
3344 else
3345 tcpm_set_state(port, SNK_STARTUP, 0);
3346 break;
3347 case SNK_STARTUP:
3348 opmode = tcpm_get_pwr_opmode(port->polarity ?
3349 port->cc2 : port->cc1);
3350 typec_set_pwr_opmode(port->typec_port, opmode);
3351 port->pwr_opmode = TYPEC_PWR_MODE_USB;
3352 port->negotiated_rev = PD_MAX_REV;
3353 port->message_id = 0;
3354 port->rx_msgid = -1;
3355 port->explicit_contract = false;
3356 tcpm_set_state(port, SNK_DISCOVERY, 0);
3357 break;
3358 case SNK_DISCOVERY:
3359 if (port->vbus_present) {
3360 tcpm_set_current_limit(port,
3361 tcpm_get_current_limit(port),
3362 5000);
3363 tcpm_set_charge(port, true);
3364 tcpm_set_state(port, SNK_WAIT_CAPABILITIES, 0);
3365 break;
3366 }
3367 /*
3368 * For DRP, timeouts differ. Also, handling is supposed to be
3369 * different and much more complex (dead battery detection;
3370 * see USB power delivery specification, section 8.3.3.6.1.5.1).
3371 */
3372 tcpm_set_state(port, hard_reset_state(port),
3373 port->port_type == TYPEC_PORT_DRP ?
3374 PD_T_DB_DETECT : PD_T_NO_RESPONSE);
3375 break;
3376 case SNK_DISCOVERY_DEBOUNCE:
3377 tcpm_set_state(port, SNK_DISCOVERY_DEBOUNCE_DONE,
3378 PD_T_CC_DEBOUNCE);
3379 break;
3380 case SNK_DISCOVERY_DEBOUNCE_DONE:
3381 if (!tcpm_port_is_disconnected(port) &&
3382 tcpm_port_is_sink(port) &&
3383 ktime_after(port->delayed_runtime, ktime_get())) {
3384 tcpm_set_state(port, SNK_DISCOVERY,
3385 ktime_to_ms(ktime_sub(port->delayed_runtime, ktime_get())));
3386 break;
3387 }
3388 tcpm_set_state(port, unattached_state(port), 0);
3389 break;
3390 case SNK_WAIT_CAPABILITIES:
3391 ret = port->tcpc->set_pd_rx(port->tcpc, true);
3392 if (ret < 0) {
3393 tcpm_set_state(port, SNK_READY, 0);
3394 break;
3395 }
3396 /*
3397 * If VBUS has never been low, and we time out waiting
3398 * for source cap, try a soft reset first, in case we
3399 * were already in a stable contract before this boot.
3400 * Do this only once.
3401 */
3402 if (port->vbus_never_low) {
3403 port->vbus_never_low = false;
3404 tcpm_set_state(port, SOFT_RESET_SEND,
3405 PD_T_SINK_WAIT_CAP);
3406 } else {
3407 tcpm_set_state(port, hard_reset_state(port),
3408 PD_T_SINK_WAIT_CAP);
3409 }
3410 break;
3411 case SNK_NEGOTIATE_CAPABILITIES:
3412 port->pd_capable = true;
3413 port->hard_reset_count = 0;
3414 ret = tcpm_pd_send_request(port);
3415 if (ret < 0) {
3416 /* Let the Source send capabilities again. */
3417 tcpm_set_state(port, SNK_WAIT_CAPABILITIES, 0);
3418 } else {
3419 tcpm_set_state_cond(port, hard_reset_state(port),
3420 PD_T_SENDER_RESPONSE);
3421 }
3422 break;
3423 case SNK_NEGOTIATE_PPS_CAPABILITIES:
3424 ret = tcpm_pd_send_pps_request(port);
3425 if (ret < 0) {
3426 port->pps_status = ret;
3427 /*
3428 * If this was called due to updates to sink
3429 * capabilities, and pps is no longer valid, we should
3430 * safely fall back to a standard PDO.
3431 */
3432 if (port->update_sink_caps)
3433 tcpm_set_state(port, SNK_NEGOTIATE_CAPABILITIES, 0);
3434 else
3435 tcpm_set_state(port, SNK_READY, 0);
3436 } else {
3437 tcpm_set_state_cond(port, hard_reset_state(port),
3438 PD_T_SENDER_RESPONSE);
3439 }
3440 break;
3441 case SNK_TRANSITION_SINK:
3442 case SNK_TRANSITION_SINK_VBUS:
3443 tcpm_set_state(port, hard_reset_state(port),
3444 PD_T_PS_TRANSITION);
3445 break;
3446 case SNK_READY:
3447 port->try_snk_count = 0;
3448 port->update_sink_caps = false;
3449 if (port->explicit_contract) {
3450 typec_set_pwr_opmode(port->typec_port,
3451 TYPEC_PWR_MODE_PD);
3452 port->pwr_opmode = TYPEC_PWR_MODE_PD;
3453 }
3454
3455 tcpm_swap_complete(port, 0);
3456 tcpm_typec_connect(port);
3457 tcpm_check_send_discover(port);
3458 mod_enable_frs_delayed_work(port, 0);
3459 tcpm_pps_complete(port, port->pps_status);
3460 power_supply_changed(port->psy);
3461 break;
3462
3463 /* Accessory states */
3464 case ACC_UNATTACHED:
3465 tcpm_acc_detach(port);
3466 tcpm_set_state(port, SRC_UNATTACHED, 0);
3467 break;
3468 case DEBUG_ACC_ATTACHED:
3469 case AUDIO_ACC_ATTACHED:
3470 ret = tcpm_acc_attach(port);
3471 if (ret < 0)
3472 tcpm_set_state(port, ACC_UNATTACHED, 0);
3473 break;
3474 case AUDIO_ACC_DEBOUNCE:
3475 tcpm_set_state(port, ACC_UNATTACHED, PD_T_CC_DEBOUNCE);
3476 break;
3477
3478 /* Hard_Reset states */
3479 case HARD_RESET_SEND:
3480 tcpm_pd_transmit(port, TCPC_TX_HARD_RESET, NULL);
3481 tcpm_set_state(port, HARD_RESET_START, 0);
3482 break;
3483 case HARD_RESET_START:
3484 port->sink_cap_done = false;
3485 if (port->tcpc->enable_frs)
3486 port->tcpc->enable_frs(port->tcpc, false);
3487 port->hard_reset_count++;
3488 port->tcpc->set_pd_rx(port->tcpc, false);
3489 tcpm_unregister_altmodes(port);
3490 port->nr_sink_caps = 0;
3491 port->send_discover = true;
3492 if (port->pwr_role == TYPEC_SOURCE)
3493 tcpm_set_state(port, SRC_HARD_RESET_VBUS_OFF,
3494 PD_T_PS_HARD_RESET);
3495 else
3496 tcpm_set_state(port, SNK_HARD_RESET_SINK_OFF, 0);
3497 break;
3498 case SRC_HARD_RESET_VBUS_OFF:
3499 /*
3500 * 7.1.5 Response to Hard Resets
3501 * Hard Reset Signaling indicates a communication failure has occurred and the
3502 * Source Shall stop driving VCONN, Shall remove Rp from the VCONN pin and Shall
3503 * drive VBUS to vSafe0V as shown in Figure 7-9.
3504 */
3505 tcpm_set_vconn(port, false);
3506 tcpm_set_vbus(port, false);
3507 tcpm_set_roles(port, port->self_powered, TYPEC_SOURCE,
3508 tcpm_data_role_for_source(port));
3509 /*
3510 * If tcpc fails to notify vbus off, TCPM will wait for PD_T_SAFE_0V +
3511 * PD_T_SRC_RECOVER before turning vbus back on.
3512 * From Table 7-12 Sequence Description for a Source Initiated Hard Reset:
3513 * 4. Policy Engine waits tPSHardReset after sending Hard Reset Signaling and then
3514 * tells the Device Policy Manager to instruct the power supply to perform a
3515 * Hard Reset. The transition to vSafe0V Shall occur within tSafe0V (t2).
3516 * 5. After tSrcRecover the Source applies power to VBUS in an attempt to
3517 * re-establish communication with the Sink and resume USB Default Operation.
3518 * The transition to vSafe5V Shall occur within tSrcTurnOn(t4).
3519 */
3520 tcpm_set_state(port, SRC_HARD_RESET_VBUS_ON, PD_T_SAFE_0V + PD_T_SRC_RECOVER);
3521 break;
3522 case SRC_HARD_RESET_VBUS_ON:
3523 tcpm_set_vconn(port, true);
3524 tcpm_set_vbus(port, true);
3525 port->tcpc->set_pd_rx(port->tcpc, true);
3526 tcpm_set_attached_state(port, true);
3527 tcpm_set_state(port, SRC_UNATTACHED, PD_T_PS_SOURCE_ON);
3528 break;
3529 case SNK_HARD_RESET_SINK_OFF:
3530 memset(&port->pps_data, 0, sizeof(port->pps_data));
3531 tcpm_set_vconn(port, false);
3532 if (port->pd_capable)
3533 tcpm_set_charge(port, false);
3534 tcpm_set_roles(port, port->self_powered, TYPEC_SINK,
3535 tcpm_data_role_for_sink(port));
3536 /*
3537 * VBUS may or may not toggle, depending on the adapter.
3538 * If it doesn't toggle, transition to SNK_HARD_RESET_SINK_ON
3539 * directly after timeout.
3540 */
3541 tcpm_set_state(port, SNK_HARD_RESET_SINK_ON, PD_T_SAFE_0V);
3542 break;
3543 case SNK_HARD_RESET_WAIT_VBUS:
3544 /* Assume we're disconnected if VBUS doesn't come back. */
3545 tcpm_set_state(port, SNK_UNATTACHED,
3546 PD_T_SRC_RECOVER_MAX + PD_T_SRC_TURN_ON);
3547 break;
3548 case SNK_HARD_RESET_SINK_ON:
3549 /* Note: There is no guarantee that VBUS is on in this state */
3550 /*
3551 * XXX:
3552 * The specification suggests that dual mode ports in sink
3553 * mode should transition to state PE_SRC_Transition_to_default.
3554 * See USB power delivery specification chapter 8.3.3.6.1.3.
3555 * This would mean to to
3556 * - turn off VCONN, reset power supply
3557 * - request hardware reset
3558 * - turn on VCONN
3559 * - Transition to state PE_Src_Startup
3560 * SNK only ports shall transition to state Snk_Startup
3561 * (see chapter 8.3.3.3.8).
3562 * Similar, dual-mode ports in source mode should transition
3563 * to PE_SNK_Transition_to_default.
3564 */
3565 if (port->pd_capable) {
3566 tcpm_set_current_limit(port,
3567 tcpm_get_current_limit(port),
3568 5000);
3569 tcpm_set_charge(port, true);
3570 }
3571 tcpm_set_attached_state(port, true);
3572 tcpm_set_state(port, SNK_STARTUP, 0);
3573 break;
3574
3575 /* Soft_Reset states */
3576 case SOFT_RESET:
3577 port->message_id = 0;
3578 port->rx_msgid = -1;
3579 tcpm_pd_send_control(port, PD_CTRL_ACCEPT);
3580 if (port->pwr_role == TYPEC_SOURCE)
3581 tcpm_set_state(port, SRC_SEND_CAPABILITIES, 0);
3582 else
3583 tcpm_set_state(port, SNK_WAIT_CAPABILITIES, 0);
3584 break;
3585 case SOFT_RESET_SEND:
3586 port->message_id = 0;
3587 port->rx_msgid = -1;
3588 if (tcpm_pd_send_control(port, PD_CTRL_SOFT_RESET))
3589 tcpm_set_state_cond(port, hard_reset_state(port), 0);
3590 else
3591 tcpm_set_state_cond(port, hard_reset_state(port),
3592 PD_T_SENDER_RESPONSE);
3593 break;
3594
3595 /* DR_Swap states */
3596 case DR_SWAP_SEND:
3597 tcpm_pd_send_control(port, PD_CTRL_DR_SWAP);
3598 tcpm_set_state_cond(port, DR_SWAP_SEND_TIMEOUT,
3599 PD_T_SENDER_RESPONSE);
3600 break;
3601 case DR_SWAP_ACCEPT:
3602 tcpm_pd_send_control(port, PD_CTRL_ACCEPT);
3603 tcpm_set_state_cond(port, DR_SWAP_CHANGE_DR, 0);
3604 break;
3605 case DR_SWAP_SEND_TIMEOUT:
3606 tcpm_swap_complete(port, -ETIMEDOUT);
3607 tcpm_set_state(port, ready_state(port), 0);
3608 break;
3609 case DR_SWAP_CHANGE_DR:
3610 if (port->data_role == TYPEC_HOST) {
3611 tcpm_unregister_altmodes(port);
3612 tcpm_set_roles(port, true, port->pwr_role,
3613 TYPEC_DEVICE);
3614 } else {
3615 tcpm_set_roles(port, true, port->pwr_role,
3616 TYPEC_HOST);
3617 port->send_discover = true;
3618 }
3619 tcpm_set_state(port, ready_state(port), 0);
3620 break;
3621
3622 case FR_SWAP_SEND:
3623 if (tcpm_pd_send_control(port, PD_CTRL_FR_SWAP)) {
3624 tcpm_set_state(port, ERROR_RECOVERY, 0);
3625 break;
3626 }
3627 tcpm_set_state_cond(port, FR_SWAP_SEND_TIMEOUT, PD_T_SENDER_RESPONSE);
3628 break;
3629 case FR_SWAP_SEND_TIMEOUT:
3630 tcpm_set_state(port, ERROR_RECOVERY, 0);
3631 break;
3632 case FR_SWAP_SNK_SRC_TRANSITION_TO_OFF:
3633 tcpm_set_state(port, ERROR_RECOVERY, PD_T_PS_SOURCE_OFF);
3634 break;
3635 case FR_SWAP_SNK_SRC_NEW_SINK_READY:
3636 if (port->vbus_source)
3637 tcpm_set_state(port, FR_SWAP_SNK_SRC_SOURCE_VBUS_APPLIED, 0);
3638 else
3639 tcpm_set_state(port, ERROR_RECOVERY, PD_T_RECEIVER_RESPONSE);
3640 break;
3641 case FR_SWAP_SNK_SRC_SOURCE_VBUS_APPLIED:
3642 tcpm_set_pwr_role(port, TYPEC_SOURCE);
3643 if (tcpm_pd_send_control(port, PD_CTRL_PS_RDY)) {
3644 tcpm_set_state(port, ERROR_RECOVERY, 0);
3645 break;
3646 }
3647 tcpm_set_cc(port, tcpm_rp_cc(port));
3648 tcpm_set_state(port, SRC_STARTUP, PD_T_SWAP_SRC_START);
3649 break;
3650
3651 /* PR_Swap states */
3652 case PR_SWAP_ACCEPT:
3653 tcpm_pd_send_control(port, PD_CTRL_ACCEPT);
3654 tcpm_set_state(port, PR_SWAP_START, 0);
3655 break;
3656 case PR_SWAP_SEND:
3657 tcpm_pd_send_control(port, PD_CTRL_PR_SWAP);
3658 tcpm_set_state_cond(port, PR_SWAP_SEND_TIMEOUT,
3659 PD_T_SENDER_RESPONSE);
3660 break;
3661 case PR_SWAP_SEND_TIMEOUT:
3662 tcpm_swap_complete(port, -ETIMEDOUT);
3663 tcpm_set_state(port, ready_state(port), 0);
3664 break;
3665 case PR_SWAP_START:
3666 if (port->pwr_role == TYPEC_SOURCE)
3667 tcpm_set_state(port, PR_SWAP_SRC_SNK_TRANSITION_OFF,
3668 PD_T_SRC_TRANSITION);
3669 else
3670 tcpm_set_state(port, PR_SWAP_SNK_SRC_SINK_OFF, 0);
3671 break;
3672 case PR_SWAP_SRC_SNK_TRANSITION_OFF:
3673 tcpm_set_vbus(port, false);
3674 port->explicit_contract = false;
3675 /* allow time for Vbus discharge, must be < tSrcSwapStdby */
3676 tcpm_set_state(port, PR_SWAP_SRC_SNK_SOURCE_OFF,
3677 PD_T_SRCSWAPSTDBY);
3678 break;
3679 case PR_SWAP_SRC_SNK_SOURCE_OFF:
3680 tcpm_set_cc(port, TYPEC_CC_RD);
3681 /* allow CC debounce */
3682 tcpm_set_state(port, PR_SWAP_SRC_SNK_SOURCE_OFF_CC_DEBOUNCED,
3683 PD_T_CC_DEBOUNCE);
3684 break;
3685 case PR_SWAP_SRC_SNK_SOURCE_OFF_CC_DEBOUNCED:
3686 /*
3687 * USB-PD standard, 6.2.1.4, Port Power Role:
3688 * "During the Power Role Swap Sequence, for the initial Source
3689 * Port, the Port Power Role field shall be set to Sink in the
3690 * PS_RDY Message indicating that the initial Source’s power
3691 * supply is turned off"
3692 */
3693 tcpm_set_pwr_role(port, TYPEC_SINK);
3694 if (tcpm_pd_send_control(port, PD_CTRL_PS_RDY)) {
3695 tcpm_set_state(port, ERROR_RECOVERY, 0);
3696 break;
3697 }
3698 tcpm_set_state_cond(port, SNK_UNATTACHED, PD_T_PS_SOURCE_ON);
3699 break;
3700 case PR_SWAP_SRC_SNK_SINK_ON:
3701 tcpm_set_state(port, SNK_STARTUP, 0);
3702 break;
3703 case PR_SWAP_SNK_SRC_SINK_OFF:
3704 tcpm_set_charge(port, false);
3705 tcpm_set_state(port, hard_reset_state(port),
3706 PD_T_PS_SOURCE_OFF);
3707 break;
3708 case PR_SWAP_SNK_SRC_SOURCE_ON:
3709 tcpm_set_cc(port, tcpm_rp_cc(port));
3710 tcpm_set_vbus(port, true);
3711 /*
3712 * allow time VBUS ramp-up, must be < tNewSrc
3713 * Also, this window overlaps with CC debounce as well.
3714 * So, Wait for the max of two which is PD_T_NEWSRC
3715 */
3716 tcpm_set_state(port, PR_SWAP_SNK_SRC_SOURCE_ON_VBUS_RAMPED_UP,
3717 PD_T_NEWSRC);
3718 break;
3719 case PR_SWAP_SNK_SRC_SOURCE_ON_VBUS_RAMPED_UP:
3720 /*
3721 * USB PD standard, 6.2.1.4:
3722 * "Subsequent Messages initiated by the Policy Engine,
3723 * such as the PS_RDY Message sent to indicate that Vbus
3724 * is ready, will have the Port Power Role field set to
3725 * Source."
3726 */
3727 tcpm_set_pwr_role(port, TYPEC_SOURCE);
3728 tcpm_pd_send_control(port, PD_CTRL_PS_RDY);
3729 tcpm_set_state(port, SRC_STARTUP, PD_T_SWAP_SRC_START);
3730 break;
3731
3732 case VCONN_SWAP_ACCEPT:
3733 tcpm_pd_send_control(port, PD_CTRL_ACCEPT);
3734 tcpm_set_state(port, VCONN_SWAP_START, 0);
3735 break;
3736 case VCONN_SWAP_SEND:
3737 tcpm_pd_send_control(port, PD_CTRL_VCONN_SWAP);
3738 tcpm_set_state(port, VCONN_SWAP_SEND_TIMEOUT,
3739 PD_T_SENDER_RESPONSE);
3740 break;
3741 case VCONN_SWAP_SEND_TIMEOUT:
3742 tcpm_swap_complete(port, -ETIMEDOUT);
3743 tcpm_set_state(port, ready_state(port), 0);
3744 break;
3745 case VCONN_SWAP_START:
3746 if (port->vconn_role == TYPEC_SOURCE)
3747 tcpm_set_state(port, VCONN_SWAP_WAIT_FOR_VCONN, 0);
3748 else
3749 tcpm_set_state(port, VCONN_SWAP_TURN_ON_VCONN, 0);
3750 break;
3751 case VCONN_SWAP_WAIT_FOR_VCONN:
3752 tcpm_set_state(port, hard_reset_state(port),
3753 PD_T_VCONN_SOURCE_ON);
3754 break;
3755 case VCONN_SWAP_TURN_ON_VCONN:
3756 tcpm_set_vconn(port, true);
3757 tcpm_pd_send_control(port, PD_CTRL_PS_RDY);
3758 tcpm_set_state(port, ready_state(port), 0);
3759 break;
3760 case VCONN_SWAP_TURN_OFF_VCONN:
3761 tcpm_set_vconn(port, false);
3762 tcpm_set_state(port, ready_state(port), 0);
3763 break;
3764
3765 case DR_SWAP_CANCEL:
3766 case PR_SWAP_CANCEL:
3767 case VCONN_SWAP_CANCEL:
3768 tcpm_swap_complete(port, port->swap_status);
3769 if (port->pwr_role == TYPEC_SOURCE)
3770 tcpm_set_state(port, SRC_READY, 0);
3771 else
3772 tcpm_set_state(port, SNK_READY, 0);
3773 break;
3774 case FR_SWAP_CANCEL:
3775 if (port->pwr_role == TYPEC_SOURCE)
3776 tcpm_set_state(port, SRC_READY, 0);
3777 else
3778 tcpm_set_state(port, SNK_READY, 0);
3779 break;
3780
3781 case BIST_RX:
3782 switch (BDO_MODE_MASK(port->bist_request)) {
3783 case BDO_MODE_CARRIER2:
3784 tcpm_pd_transmit(port, TCPC_TX_BIST_MODE_2, NULL);
3785 tcpm_set_state(port, unattached_state(port),
3786 PD_T_BIST_CONT_MODE);
3787 break;
3788 case BDO_MODE_TESTDATA:
3789 if (port->tcpc->set_bist_data) {
3790 tcpm_log(port, "Enable BIST MODE TESTDATA");
3791 port->tcpc->set_bist_data(port->tcpc, true);
3792 }
3793 break;
3794 default:
3795 break;
3796 }
3797 break;
3798 case GET_STATUS_SEND:
3799 tcpm_pd_send_control(port, PD_CTRL_GET_STATUS);
3800 tcpm_set_state(port, GET_STATUS_SEND_TIMEOUT,
3801 PD_T_SENDER_RESPONSE);
3802 break;
3803 case GET_STATUS_SEND_TIMEOUT:
3804 tcpm_set_state(port, ready_state(port), 0);
3805 break;
3806 case GET_PPS_STATUS_SEND:
3807 tcpm_pd_send_control(port, PD_CTRL_GET_PPS_STATUS);
3808 tcpm_set_state(port, GET_PPS_STATUS_SEND_TIMEOUT,
3809 PD_T_SENDER_RESPONSE);
3810 break;
3811 case GET_PPS_STATUS_SEND_TIMEOUT:
3812 tcpm_set_state(port, ready_state(port), 0);
3813 break;
3814 case GET_SINK_CAP:
3815 tcpm_pd_send_control(port, PD_CTRL_GET_SINK_CAP);
3816 tcpm_set_state(port, GET_SINK_CAP_TIMEOUT, PD_T_SENDER_RESPONSE);
3817 break;
3818 case GET_SINK_CAP_TIMEOUT:
3819 port->sink_cap_done = true;
3820 tcpm_set_state(port, ready_state(port), 0);
3821 break;
3822 case ERROR_RECOVERY:
3823 tcpm_swap_complete(port, -EPROTO);
3824 tcpm_pps_complete(port, -EPROTO);
3825 tcpm_set_state(port, PORT_RESET, 0);
3826 break;
3827 case PORT_RESET:
3828 tcpm_reset_port(port);
3829 tcpm_set_cc(port, TYPEC_CC_OPEN);
3830 tcpm_set_state(port, PORT_RESET_WAIT_OFF,
3831 PD_T_ERROR_RECOVERY);
3832 break;
3833 case PORT_RESET_WAIT_OFF:
3834 tcpm_set_state(port,
3835 tcpm_default_state(port),
3836 port->vbus_present ? PD_T_PS_SOURCE_OFF : 0);
3837 break;
3838 default:
3839 WARN(1, "Unexpected port state %d\n", port->state);
3840 break;
3841 }
3842 }
3843
tcpm_state_machine_work(struct kthread_work * work)3844 static void tcpm_state_machine_work(struct kthread_work *work)
3845 {
3846 struct tcpm_port *port = container_of(work, struct tcpm_port, state_machine);
3847 enum tcpm_state prev_state;
3848
3849 mutex_lock(&port->lock);
3850 port->state_machine_running = true;
3851
3852 if (port->queued_message && tcpm_send_queued_message(port))
3853 goto done;
3854
3855 /* If we were queued due to a delayed state change, update it now */
3856 if (port->delayed_state) {
3857 tcpm_log(port, "state change %s -> %s [delayed %ld ms]",
3858 tcpm_states[port->state],
3859 tcpm_states[port->delayed_state], port->delay_ms);
3860 port->prev_state = port->state;
3861 port->state = port->delayed_state;
3862 port->delayed_state = INVALID_STATE;
3863 }
3864
3865 /*
3866 * Continue running as long as we have (non-delayed) state changes
3867 * to make.
3868 */
3869 do {
3870 prev_state = port->state;
3871 run_state_machine(port);
3872 if (port->queued_message)
3873 tcpm_send_queued_message(port);
3874 } while (port->state != prev_state && !port->delayed_state);
3875
3876 done:
3877 port->state_machine_running = false;
3878 mutex_unlock(&port->lock);
3879 }
3880
_tcpm_cc_change(struct tcpm_port * port,enum typec_cc_status cc1,enum typec_cc_status cc2)3881 static void _tcpm_cc_change(struct tcpm_port *port, enum typec_cc_status cc1,
3882 enum typec_cc_status cc2)
3883 {
3884 enum typec_cc_status old_cc1, old_cc2;
3885 enum tcpm_state new_state;
3886
3887 old_cc1 = port->cc1;
3888 old_cc2 = port->cc2;
3889 port->cc1 = cc1;
3890 port->cc2 = cc2;
3891
3892 tcpm_log_force(port,
3893 "CC1: %u -> %u, CC2: %u -> %u [state %s, polarity %d, %s]",
3894 old_cc1, cc1, old_cc2, cc2, tcpm_states[port->state],
3895 port->polarity,
3896 tcpm_port_is_disconnected(port) ? "disconnected"
3897 : "connected");
3898
3899 switch (port->state) {
3900 case TOGGLING:
3901 if (tcpm_port_is_debug(port) || tcpm_port_is_audio(port) ||
3902 tcpm_port_is_source(port))
3903 tcpm_set_state(port, SRC_ATTACH_WAIT, 0);
3904 else if (tcpm_port_is_sink(port))
3905 tcpm_set_state(port, SNK_ATTACH_WAIT, 0);
3906 break;
3907 case SRC_UNATTACHED:
3908 case ACC_UNATTACHED:
3909 if (tcpm_port_is_debug(port) || tcpm_port_is_audio(port) ||
3910 tcpm_port_is_source(port))
3911 tcpm_set_state(port, SRC_ATTACH_WAIT, 0);
3912 break;
3913 case SRC_ATTACH_WAIT:
3914 if (tcpm_port_is_disconnected(port) ||
3915 tcpm_port_is_audio_detached(port))
3916 tcpm_set_state(port, SRC_UNATTACHED, 0);
3917 else if (cc1 != old_cc1 || cc2 != old_cc2)
3918 tcpm_set_state(port, SRC_ATTACH_WAIT, 0);
3919 break;
3920 case SRC_ATTACHED:
3921 case SRC_STARTUP:
3922 case SRC_SEND_CAPABILITIES:
3923 case SRC_READY:
3924 if (tcpm_port_is_disconnected(port) ||
3925 !tcpm_port_is_source(port)) {
3926 if (port->port_type == TYPEC_PORT_SRC)
3927 tcpm_set_state(port, SRC_UNATTACHED, 0);
3928 else
3929 tcpm_set_state(port, SNK_UNATTACHED, 0);
3930 }
3931 break;
3932 case SNK_UNATTACHED:
3933 if (tcpm_port_is_sink(port))
3934 tcpm_set_state(port, SNK_ATTACH_WAIT, 0);
3935 break;
3936 case SNK_ATTACH_WAIT:
3937 if ((port->cc1 == TYPEC_CC_OPEN &&
3938 port->cc2 != TYPEC_CC_OPEN) ||
3939 (port->cc1 != TYPEC_CC_OPEN &&
3940 port->cc2 == TYPEC_CC_OPEN))
3941 new_state = SNK_DEBOUNCED;
3942 else if (tcpm_port_is_disconnected(port))
3943 new_state = SNK_UNATTACHED;
3944 else
3945 break;
3946 if (new_state != port->delayed_state)
3947 tcpm_set_state(port, SNK_ATTACH_WAIT, 0);
3948 break;
3949 case SNK_DEBOUNCED:
3950 if (tcpm_port_is_disconnected(port))
3951 new_state = SNK_UNATTACHED;
3952 else if (port->vbus_present)
3953 new_state = tcpm_try_src(port) ? SRC_TRY : SNK_ATTACHED;
3954 else
3955 new_state = SNK_UNATTACHED;
3956 if (new_state != port->delayed_state)
3957 tcpm_set_state(port, SNK_DEBOUNCED, 0);
3958 break;
3959 case SNK_READY:
3960 if (tcpm_port_is_disconnected(port))
3961 tcpm_set_state(port, unattached_state(port), 0);
3962 else if (!port->pd_capable &&
3963 (cc1 != old_cc1 || cc2 != old_cc2))
3964 tcpm_set_current_limit(port,
3965 tcpm_get_current_limit(port),
3966 5000);
3967 break;
3968
3969 case AUDIO_ACC_ATTACHED:
3970 if (cc1 == TYPEC_CC_OPEN || cc2 == TYPEC_CC_OPEN)
3971 tcpm_set_state(port, AUDIO_ACC_DEBOUNCE, 0);
3972 break;
3973 case AUDIO_ACC_DEBOUNCE:
3974 if (tcpm_port_is_audio(port))
3975 tcpm_set_state(port, AUDIO_ACC_ATTACHED, 0);
3976 break;
3977
3978 case DEBUG_ACC_ATTACHED:
3979 if (cc1 == TYPEC_CC_OPEN || cc2 == TYPEC_CC_OPEN)
3980 tcpm_set_state(port, ACC_UNATTACHED, 0);
3981 break;
3982
3983 case SNK_TRY:
3984 /* Do nothing, waiting for timeout */
3985 break;
3986
3987 case SNK_DISCOVERY:
3988 /* CC line is unstable, wait for debounce */
3989 if (tcpm_port_is_disconnected(port))
3990 tcpm_set_state(port, SNK_DISCOVERY_DEBOUNCE, 0);
3991 break;
3992 case SNK_DISCOVERY_DEBOUNCE:
3993 break;
3994
3995 case SRC_TRYWAIT:
3996 /* Hand over to state machine if needed */
3997 if (!port->vbus_present && tcpm_port_is_source(port))
3998 tcpm_set_state(port, SRC_TRYWAIT_DEBOUNCE, 0);
3999 break;
4000 case SRC_TRYWAIT_DEBOUNCE:
4001 if (port->vbus_present || !tcpm_port_is_source(port))
4002 tcpm_set_state(port, SRC_TRYWAIT, 0);
4003 break;
4004 case SNK_TRY_WAIT_DEBOUNCE:
4005 if (!tcpm_port_is_sink(port)) {
4006 port->max_wait = 0;
4007 tcpm_set_state(port, SRC_TRYWAIT, 0);
4008 }
4009 break;
4010 case SRC_TRY_WAIT:
4011 if (tcpm_port_is_source(port))
4012 tcpm_set_state(port, SRC_TRY_DEBOUNCE, 0);
4013 break;
4014 case SRC_TRY_DEBOUNCE:
4015 tcpm_set_state(port, SRC_TRY_WAIT, 0);
4016 break;
4017 case SNK_TRYWAIT_DEBOUNCE:
4018 if (tcpm_port_is_sink(port))
4019 tcpm_set_state(port, SNK_TRYWAIT_VBUS, 0);
4020 break;
4021 case SNK_TRYWAIT_VBUS:
4022 if (!tcpm_port_is_sink(port))
4023 tcpm_set_state(port, SNK_TRYWAIT_DEBOUNCE, 0);
4024 break;
4025 case SNK_TRYWAIT:
4026 /* Do nothing, waiting for tCCDebounce */
4027 break;
4028 case PR_SWAP_SNK_SRC_SINK_OFF:
4029 case PR_SWAP_SRC_SNK_TRANSITION_OFF:
4030 case PR_SWAP_SRC_SNK_SOURCE_OFF:
4031 case PR_SWAP_SRC_SNK_SOURCE_OFF_CC_DEBOUNCED:
4032 case PR_SWAP_SNK_SRC_SOURCE_ON:
4033 /*
4034 * CC state change is expected in PR_SWAP
4035 * Ignore it.
4036 */
4037 break;
4038 case FR_SWAP_SEND:
4039 case FR_SWAP_SEND_TIMEOUT:
4040 case FR_SWAP_SNK_SRC_TRANSITION_TO_OFF:
4041 case FR_SWAP_SNK_SRC_NEW_SINK_READY:
4042 case FR_SWAP_SNK_SRC_SOURCE_VBUS_APPLIED:
4043 /* Do nothing, CC change expected */
4044 break;
4045
4046 case PORT_RESET:
4047 case PORT_RESET_WAIT_OFF:
4048 /*
4049 * State set back to default mode once the timer completes.
4050 * Ignore CC changes here.
4051 */
4052 break;
4053
4054 default:
4055 if (tcpm_port_is_disconnected(port))
4056 tcpm_set_state(port, unattached_state(port), 0);
4057 break;
4058 }
4059 }
4060
_tcpm_pd_vbus_on(struct tcpm_port * port)4061 static void _tcpm_pd_vbus_on(struct tcpm_port *port)
4062 {
4063 tcpm_log_force(port, "VBUS on");
4064 port->vbus_present = true;
4065 switch (port->state) {
4066 case SNK_TRANSITION_SINK_VBUS:
4067 port->explicit_contract = true;
4068 tcpm_set_state(port, SNK_READY, 0);
4069 break;
4070 case SNK_DISCOVERY:
4071 tcpm_set_state(port, SNK_DISCOVERY, 0);
4072 break;
4073
4074 case SNK_DEBOUNCED:
4075 tcpm_set_state(port, tcpm_try_src(port) ? SRC_TRY
4076 : SNK_ATTACHED,
4077 0);
4078 break;
4079 case SNK_HARD_RESET_WAIT_VBUS:
4080 tcpm_set_state(port, SNK_HARD_RESET_SINK_ON, 0);
4081 break;
4082 case SRC_ATTACHED:
4083 tcpm_set_state(port, SRC_STARTUP, 0);
4084 break;
4085 case SRC_HARD_RESET_VBUS_ON:
4086 tcpm_set_state(port, SRC_STARTUP, 0);
4087 break;
4088
4089 case SNK_TRY:
4090 /* Do nothing, waiting for timeout */
4091 break;
4092 case SRC_TRYWAIT:
4093 /* Do nothing, Waiting for Rd to be detected */
4094 break;
4095 case SRC_TRYWAIT_DEBOUNCE:
4096 tcpm_set_state(port, SRC_TRYWAIT, 0);
4097 break;
4098 case SNK_TRY_WAIT_DEBOUNCE:
4099 /* Do nothing, waiting for PD_DEBOUNCE to do be done */
4100 break;
4101 case SNK_TRYWAIT:
4102 /* Do nothing, waiting for tCCDebounce */
4103 break;
4104 case SNK_TRYWAIT_VBUS:
4105 if (tcpm_port_is_sink(port))
4106 tcpm_set_state(port, SNK_ATTACHED, 0);
4107 break;
4108 case SNK_TRYWAIT_DEBOUNCE:
4109 /* Do nothing, waiting for Rp */
4110 break;
4111 case SRC_TRY_WAIT:
4112 case SRC_TRY_DEBOUNCE:
4113 /* Do nothing, waiting for sink detection */
4114 break;
4115 case FR_SWAP_SNK_SRC_NEW_SINK_READY:
4116 tcpm_set_state(port, FR_SWAP_SNK_SRC_SOURCE_VBUS_APPLIED, 0);
4117 break;
4118
4119 case PORT_RESET:
4120 case PORT_RESET_WAIT_OFF:
4121 /*
4122 * State set back to default mode once the timer completes.
4123 * Ignore vbus changes here.
4124 */
4125 break;
4126
4127 default:
4128 break;
4129 }
4130 }
4131
_tcpm_pd_vbus_off(struct tcpm_port * port)4132 static void _tcpm_pd_vbus_off(struct tcpm_port *port)
4133 {
4134 tcpm_log_force(port, "VBUS off");
4135 port->vbus_present = false;
4136 port->vbus_never_low = false;
4137 switch (port->state) {
4138 case SNK_HARD_RESET_SINK_OFF:
4139 tcpm_set_state(port, SNK_HARD_RESET_WAIT_VBUS, 0);
4140 break;
4141 case SRC_HARD_RESET_VBUS_OFF:
4142 /*
4143 * After establishing the vSafe0V voltage condition on VBUS, the Source Shall wait
4144 * tSrcRecover before re-applying VCONN and restoring VBUS to vSafe5V.
4145 */
4146 tcpm_set_state(port, SRC_HARD_RESET_VBUS_ON, PD_T_SRC_RECOVER);
4147 break;
4148 case HARD_RESET_SEND:
4149 break;
4150
4151 case SNK_TRY:
4152 /* Do nothing, waiting for timeout */
4153 break;
4154 case SRC_TRYWAIT:
4155 /* Hand over to state machine if needed */
4156 if (tcpm_port_is_source(port))
4157 tcpm_set_state(port, SRC_TRYWAIT_DEBOUNCE, 0);
4158 break;
4159 case SNK_TRY_WAIT_DEBOUNCE:
4160 /* Do nothing, waiting for PD_DEBOUNCE to do be done */
4161 break;
4162 case SNK_TRYWAIT:
4163 case SNK_TRYWAIT_VBUS:
4164 case SNK_TRYWAIT_DEBOUNCE:
4165 break;
4166 case SNK_ATTACH_WAIT:
4167 case SNK_DEBOUNCED:
4168 /* Do nothing, as TCPM is still waiting for vbus to reaach VSAFE5V to connect */
4169 break;
4170
4171 case SNK_NEGOTIATE_CAPABILITIES:
4172 break;
4173
4174 case PR_SWAP_SRC_SNK_TRANSITION_OFF:
4175 tcpm_set_state(port, PR_SWAP_SRC_SNK_SOURCE_OFF, 0);
4176 break;
4177
4178 case PR_SWAP_SNK_SRC_SINK_OFF:
4179 /* Do nothing, expected */
4180 break;
4181
4182 case PORT_RESET_WAIT_OFF:
4183 tcpm_set_state(port, tcpm_default_state(port), 0);
4184 break;
4185
4186 case SRC_TRY_WAIT:
4187 case SRC_TRY_DEBOUNCE:
4188 /* Do nothing, waiting for sink detection */
4189 break;
4190
4191 case PORT_RESET:
4192 /*
4193 * State set back to default mode once the timer completes.
4194 * Ignore vbus changes here.
4195 */
4196 break;
4197
4198 case FR_SWAP_SEND:
4199 case FR_SWAP_SEND_TIMEOUT:
4200 case FR_SWAP_SNK_SRC_TRANSITION_TO_OFF:
4201 case FR_SWAP_SNK_SRC_NEW_SINK_READY:
4202 case FR_SWAP_SNK_SRC_SOURCE_VBUS_APPLIED:
4203 /* Do nothing, vbus drop expected */
4204 break;
4205
4206 default:
4207 if (port->pwr_role == TYPEC_SINK &&
4208 port->attached)
4209 tcpm_set_state(port, SNK_UNATTACHED, 0);
4210 break;
4211 }
4212 }
4213
_tcpm_pd_hard_reset(struct tcpm_port * port)4214 static void _tcpm_pd_hard_reset(struct tcpm_port *port)
4215 {
4216 tcpm_log_force(port, "Received hard reset");
4217 if (port->bist_request == BDO_MODE_TESTDATA && port->tcpc->set_bist_data)
4218 port->tcpc->set_bist_data(port->tcpc, false);
4219
4220 /*
4221 * If we keep receiving hard reset requests, executing the hard reset
4222 * must have failed. Revert to error recovery if that happens.
4223 */
4224 tcpm_set_state(port,
4225 port->hard_reset_count < PD_N_HARD_RESET_COUNT ?
4226 HARD_RESET_START : ERROR_RECOVERY,
4227 0);
4228 }
4229
tcpm_pd_event_handler(struct kthread_work * work)4230 static void tcpm_pd_event_handler(struct kthread_work *work)
4231 {
4232 struct tcpm_port *port = container_of(work, struct tcpm_port,
4233 event_work);
4234 u32 events;
4235
4236 mutex_lock(&port->lock);
4237
4238 spin_lock(&port->pd_event_lock);
4239 while (port->pd_events) {
4240 events = port->pd_events;
4241 port->pd_events = 0;
4242 spin_unlock(&port->pd_event_lock);
4243 if (events & TCPM_RESET_EVENT)
4244 _tcpm_pd_hard_reset(port);
4245 if (events & TCPM_VBUS_EVENT) {
4246 bool vbus;
4247
4248 vbus = port->tcpc->get_vbus(port->tcpc);
4249 if (vbus)
4250 _tcpm_pd_vbus_on(port);
4251 else
4252 _tcpm_pd_vbus_off(port);
4253 }
4254 if (events & TCPM_CC_EVENT) {
4255 enum typec_cc_status cc1, cc2;
4256
4257 if (port->tcpc->get_cc(port->tcpc, &cc1, &cc2) == 0)
4258 _tcpm_cc_change(port, cc1, cc2);
4259 }
4260 if (events & TCPM_FRS_EVENT) {
4261 if (port->state == SNK_READY)
4262 tcpm_set_state(port, FR_SWAP_SEND, 0);
4263 else
4264 tcpm_log(port, "Discarding FRS_SIGNAL! Not in sink ready");
4265 }
4266 if (events & TCPM_SOURCING_VBUS) {
4267 tcpm_log(port, "sourcing vbus");
4268 /*
4269 * In fast role swap case TCPC autonomously sources vbus. Set vbus_source
4270 * true as TCPM wouldn't have called tcpm_set_vbus.
4271 *
4272 * When vbus is sourced on the command on TCPM i.e. TCPM called
4273 * tcpm_set_vbus to source vbus, vbus_source would already be true.
4274 */
4275 port->vbus_source = true;
4276 _tcpm_pd_vbus_on(port);
4277 }
4278
4279 spin_lock(&port->pd_event_lock);
4280 }
4281 spin_unlock(&port->pd_event_lock);
4282 mutex_unlock(&port->lock);
4283 }
4284
tcpm_cc_change(struct tcpm_port * port)4285 void tcpm_cc_change(struct tcpm_port *port)
4286 {
4287 spin_lock(&port->pd_event_lock);
4288 port->pd_events |= TCPM_CC_EVENT;
4289 spin_unlock(&port->pd_event_lock);
4290 kthread_queue_work(port->wq, &port->event_work);
4291 }
4292 EXPORT_SYMBOL_GPL(tcpm_cc_change);
4293
tcpm_vbus_change(struct tcpm_port * port)4294 void tcpm_vbus_change(struct tcpm_port *port)
4295 {
4296 spin_lock(&port->pd_event_lock);
4297 port->pd_events |= TCPM_VBUS_EVENT;
4298 spin_unlock(&port->pd_event_lock);
4299 kthread_queue_work(port->wq, &port->event_work);
4300 }
4301 EXPORT_SYMBOL_GPL(tcpm_vbus_change);
4302
tcpm_pd_hard_reset(struct tcpm_port * port)4303 void tcpm_pd_hard_reset(struct tcpm_port *port)
4304 {
4305 spin_lock(&port->pd_event_lock);
4306 port->pd_events = TCPM_RESET_EVENT;
4307 spin_unlock(&port->pd_event_lock);
4308 kthread_queue_work(port->wq, &port->event_work);
4309 }
4310 EXPORT_SYMBOL_GPL(tcpm_pd_hard_reset);
4311
tcpm_sink_frs(struct tcpm_port * port)4312 void tcpm_sink_frs(struct tcpm_port *port)
4313 {
4314 spin_lock(&port->pd_event_lock);
4315 port->pd_events |= TCPM_FRS_EVENT;
4316 spin_unlock(&port->pd_event_lock);
4317 kthread_queue_work(port->wq, &port->event_work);
4318 }
4319 EXPORT_SYMBOL_GPL(tcpm_sink_frs);
4320
tcpm_sourcing_vbus(struct tcpm_port * port)4321 void tcpm_sourcing_vbus(struct tcpm_port *port)
4322 {
4323 spin_lock(&port->pd_event_lock);
4324 port->pd_events |= TCPM_SOURCING_VBUS;
4325 spin_unlock(&port->pd_event_lock);
4326 kthread_queue_work(port->wq, &port->event_work);
4327 }
4328 EXPORT_SYMBOL_GPL(tcpm_sourcing_vbus);
4329
tcpm_enable_frs_work(struct kthread_work * work)4330 static void tcpm_enable_frs_work(struct kthread_work *work)
4331 {
4332 struct tcpm_port *port = container_of(work, struct tcpm_port, enable_frs);
4333
4334 mutex_lock(&port->lock);
4335 /* Not FRS capable */
4336 if (!port->connected || port->port_type != TYPEC_PORT_DRP ||
4337 port->pwr_opmode != TYPEC_PWR_MODE_PD ||
4338 !port->tcpc->enable_frs ||
4339 /* Sink caps queried */
4340 port->sink_cap_done || port->negotiated_rev < PD_REV30)
4341 goto unlock;
4342
4343 /* Send when the state machine is idle */
4344 if (port->state != SNK_READY || port->vdm_state != VDM_STATE_DONE || port->send_discover)
4345 goto resched;
4346
4347 tcpm_set_state(port, GET_SINK_CAP, 0);
4348 port->sink_cap_done = true;
4349
4350 resched:
4351 mod_enable_frs_delayed_work(port, GET_SINK_CAP_RETRY_MS);
4352 unlock:
4353 mutex_unlock(&port->lock);
4354 }
4355
tcpm_dr_set(struct typec_port * p,enum typec_data_role data)4356 static int tcpm_dr_set(struct typec_port *p, enum typec_data_role data)
4357 {
4358 struct tcpm_port *port = typec_get_drvdata(p);
4359 int ret;
4360
4361 mutex_lock(&port->swap_lock);
4362 mutex_lock(&port->lock);
4363
4364 if (port->typec_caps.data != TYPEC_PORT_DRD) {
4365 ret = -EINVAL;
4366 goto port_unlock;
4367 }
4368 if (port->state != SRC_READY && port->state != SNK_READY) {
4369 ret = -EAGAIN;
4370 goto port_unlock;
4371 }
4372
4373 if (port->data_role == data) {
4374 ret = 0;
4375 goto port_unlock;
4376 }
4377
4378 /*
4379 * XXX
4380 * 6.3.9: If an alternate mode is active, a request to swap
4381 * alternate modes shall trigger a port reset.
4382 * Reject data role swap request in this case.
4383 */
4384
4385 if (!port->pd_capable) {
4386 /*
4387 * If the partner is not PD capable, reset the port to
4388 * trigger a role change. This can only work if a preferred
4389 * role is configured, and if it matches the requested role.
4390 */
4391 if (port->try_role == TYPEC_NO_PREFERRED_ROLE ||
4392 port->try_role == port->pwr_role) {
4393 ret = -EINVAL;
4394 goto port_unlock;
4395 }
4396 port->non_pd_role_swap = true;
4397 tcpm_set_state(port, PORT_RESET, 0);
4398 } else {
4399 tcpm_set_state(port, DR_SWAP_SEND, 0);
4400 }
4401
4402 port->swap_status = 0;
4403 port->swap_pending = true;
4404 reinit_completion(&port->swap_complete);
4405 mutex_unlock(&port->lock);
4406
4407 if (!wait_for_completion_timeout(&port->swap_complete,
4408 msecs_to_jiffies(PD_ROLE_SWAP_TIMEOUT)))
4409 ret = -ETIMEDOUT;
4410 else
4411 ret = port->swap_status;
4412
4413 port->non_pd_role_swap = false;
4414 goto swap_unlock;
4415
4416 port_unlock:
4417 mutex_unlock(&port->lock);
4418 swap_unlock:
4419 mutex_unlock(&port->swap_lock);
4420 return ret;
4421 }
4422
tcpm_pr_set(struct typec_port * p,enum typec_role role)4423 static int tcpm_pr_set(struct typec_port *p, enum typec_role role)
4424 {
4425 struct tcpm_port *port = typec_get_drvdata(p);
4426 int ret;
4427
4428 mutex_lock(&port->swap_lock);
4429 mutex_lock(&port->lock);
4430
4431 if (port->port_type != TYPEC_PORT_DRP) {
4432 ret = -EINVAL;
4433 goto port_unlock;
4434 }
4435 if (port->state != SRC_READY && port->state != SNK_READY) {
4436 ret = -EAGAIN;
4437 goto port_unlock;
4438 }
4439
4440 if (role == port->pwr_role) {
4441 ret = 0;
4442 goto port_unlock;
4443 }
4444
4445 port->swap_status = 0;
4446 port->swap_pending = true;
4447 reinit_completion(&port->swap_complete);
4448 tcpm_set_state(port, PR_SWAP_SEND, 0);
4449 mutex_unlock(&port->lock);
4450
4451 if (!wait_for_completion_timeout(&port->swap_complete,
4452 msecs_to_jiffies(PD_ROLE_SWAP_TIMEOUT)))
4453 ret = -ETIMEDOUT;
4454 else
4455 ret = port->swap_status;
4456
4457 goto swap_unlock;
4458
4459 port_unlock:
4460 mutex_unlock(&port->lock);
4461 swap_unlock:
4462 mutex_unlock(&port->swap_lock);
4463 return ret;
4464 }
4465
tcpm_vconn_set(struct typec_port * p,enum typec_role role)4466 static int tcpm_vconn_set(struct typec_port *p, enum typec_role role)
4467 {
4468 struct tcpm_port *port = typec_get_drvdata(p);
4469 int ret;
4470
4471 mutex_lock(&port->swap_lock);
4472 mutex_lock(&port->lock);
4473
4474 if (port->state != SRC_READY && port->state != SNK_READY) {
4475 ret = -EAGAIN;
4476 goto port_unlock;
4477 }
4478
4479 if (role == port->vconn_role) {
4480 ret = 0;
4481 goto port_unlock;
4482 }
4483
4484 port->swap_status = 0;
4485 port->swap_pending = true;
4486 reinit_completion(&port->swap_complete);
4487 tcpm_set_state(port, VCONN_SWAP_SEND, 0);
4488 mutex_unlock(&port->lock);
4489
4490 if (!wait_for_completion_timeout(&port->swap_complete,
4491 msecs_to_jiffies(PD_ROLE_SWAP_TIMEOUT)))
4492 ret = -ETIMEDOUT;
4493 else
4494 ret = port->swap_status;
4495
4496 goto swap_unlock;
4497
4498 port_unlock:
4499 mutex_unlock(&port->lock);
4500 swap_unlock:
4501 mutex_unlock(&port->swap_lock);
4502 return ret;
4503 }
4504
tcpm_try_role(struct typec_port * p,int role)4505 static int tcpm_try_role(struct typec_port *p, int role)
4506 {
4507 struct tcpm_port *port = typec_get_drvdata(p);
4508 struct tcpc_dev *tcpc = port->tcpc;
4509 int ret = 0;
4510
4511 mutex_lock(&port->lock);
4512 if (tcpc->try_role)
4513 ret = tcpc->try_role(tcpc, role);
4514 if (!ret)
4515 port->try_role = role;
4516 port->try_src_count = 0;
4517 port->try_snk_count = 0;
4518 mutex_unlock(&port->lock);
4519
4520 return ret;
4521 }
4522
tcpm_pps_set_op_curr(struct tcpm_port * port,u16 req_op_curr)4523 static int tcpm_pps_set_op_curr(struct tcpm_port *port, u16 req_op_curr)
4524 {
4525 unsigned int target_mw;
4526 int ret;
4527
4528 mutex_lock(&port->swap_lock);
4529 mutex_lock(&port->lock);
4530
4531 if (!port->pps_data.active) {
4532 ret = -EOPNOTSUPP;
4533 goto port_unlock;
4534 }
4535
4536 if (port->state != SNK_READY) {
4537 ret = -EAGAIN;
4538 goto port_unlock;
4539 }
4540
4541 if (req_op_curr > port->pps_data.max_curr) {
4542 ret = -EINVAL;
4543 goto port_unlock;
4544 }
4545
4546 target_mw = (req_op_curr * port->supply_voltage) / 1000;
4547 if (target_mw < port->operating_snk_mw) {
4548 ret = -EINVAL;
4549 goto port_unlock;
4550 }
4551
4552 /* Round down operating current to align with PPS valid steps */
4553 req_op_curr = req_op_curr - (req_op_curr % RDO_PROG_CURR_MA_STEP);
4554
4555 reinit_completion(&port->pps_complete);
4556 port->pps_data.req_op_curr = req_op_curr;
4557 port->pps_status = 0;
4558 port->pps_pending = true;
4559 tcpm_set_state(port, SNK_NEGOTIATE_PPS_CAPABILITIES, 0);
4560 mutex_unlock(&port->lock);
4561
4562 if (!wait_for_completion_timeout(&port->pps_complete,
4563 msecs_to_jiffies(PD_PPS_CTRL_TIMEOUT)))
4564 ret = -ETIMEDOUT;
4565 else
4566 ret = port->pps_status;
4567
4568 goto swap_unlock;
4569
4570 port_unlock:
4571 mutex_unlock(&port->lock);
4572 swap_unlock:
4573 mutex_unlock(&port->swap_lock);
4574
4575 return ret;
4576 }
4577
tcpm_pps_set_out_volt(struct tcpm_port * port,u16 req_out_volt)4578 static int tcpm_pps_set_out_volt(struct tcpm_port *port, u16 req_out_volt)
4579 {
4580 unsigned int target_mw;
4581 int ret;
4582
4583 mutex_lock(&port->swap_lock);
4584 mutex_lock(&port->lock);
4585
4586 if (!port->pps_data.active) {
4587 ret = -EOPNOTSUPP;
4588 goto port_unlock;
4589 }
4590
4591 if (port->state != SNK_READY) {
4592 ret = -EAGAIN;
4593 goto port_unlock;
4594 }
4595
4596 if (req_out_volt < port->pps_data.min_volt ||
4597 req_out_volt > port->pps_data.max_volt) {
4598 ret = -EINVAL;
4599 goto port_unlock;
4600 }
4601
4602 target_mw = (port->current_limit * req_out_volt) / 1000;
4603 if (target_mw < port->operating_snk_mw) {
4604 ret = -EINVAL;
4605 goto port_unlock;
4606 }
4607
4608 /* Round down output voltage to align with PPS valid steps */
4609 req_out_volt = req_out_volt - (req_out_volt % RDO_PROG_VOLT_MV_STEP);
4610
4611 reinit_completion(&port->pps_complete);
4612 port->pps_data.req_out_volt = req_out_volt;
4613 port->pps_status = 0;
4614 port->pps_pending = true;
4615 tcpm_set_state(port, SNK_NEGOTIATE_PPS_CAPABILITIES, 0);
4616 mutex_unlock(&port->lock);
4617
4618 if (!wait_for_completion_timeout(&port->pps_complete,
4619 msecs_to_jiffies(PD_PPS_CTRL_TIMEOUT)))
4620 ret = -ETIMEDOUT;
4621 else
4622 ret = port->pps_status;
4623
4624 goto swap_unlock;
4625
4626 port_unlock:
4627 mutex_unlock(&port->lock);
4628 swap_unlock:
4629 mutex_unlock(&port->swap_lock);
4630
4631 return ret;
4632 }
4633
tcpm_pps_activate(struct tcpm_port * port,bool activate)4634 static int tcpm_pps_activate(struct tcpm_port *port, bool activate)
4635 {
4636 int ret = 0;
4637
4638 mutex_lock(&port->swap_lock);
4639 mutex_lock(&port->lock);
4640
4641 if (!port->pps_data.supported) {
4642 ret = -EOPNOTSUPP;
4643 goto port_unlock;
4644 }
4645
4646 /* Trying to deactivate PPS when already deactivated so just bail */
4647 if (!port->pps_data.active && !activate)
4648 goto port_unlock;
4649
4650 if (port->state != SNK_READY) {
4651 ret = -EAGAIN;
4652 goto port_unlock;
4653 }
4654
4655 reinit_completion(&port->pps_complete);
4656 port->pps_status = 0;
4657 port->pps_pending = true;
4658
4659 /* Trigger PPS request or move back to standard PDO contract */
4660 if (activate) {
4661 port->pps_data.req_out_volt = port->supply_voltage;
4662 port->pps_data.req_op_curr = port->current_limit;
4663 tcpm_set_state(port, SNK_NEGOTIATE_PPS_CAPABILITIES, 0);
4664 } else {
4665 tcpm_set_state(port, SNK_NEGOTIATE_CAPABILITIES, 0);
4666 }
4667 mutex_unlock(&port->lock);
4668
4669 if (!wait_for_completion_timeout(&port->pps_complete,
4670 msecs_to_jiffies(PD_PPS_CTRL_TIMEOUT)))
4671 ret = -ETIMEDOUT;
4672 else
4673 ret = port->pps_status;
4674
4675 goto swap_unlock;
4676
4677 port_unlock:
4678 mutex_unlock(&port->lock);
4679 swap_unlock:
4680 mutex_unlock(&port->swap_lock);
4681
4682 return ret;
4683 }
4684
tcpm_init(struct tcpm_port * port)4685 static void tcpm_init(struct tcpm_port *port)
4686 {
4687 enum typec_cc_status cc1, cc2;
4688
4689 port->tcpc->init(port->tcpc);
4690
4691 tcpm_reset_port(port);
4692
4693 /*
4694 * XXX
4695 * Should possibly wait for VBUS to settle if it was enabled locally
4696 * since tcpm_reset_port() will disable VBUS.
4697 */
4698 port->vbus_present = port->tcpc->get_vbus(port->tcpc);
4699 if (port->vbus_present)
4700 port->vbus_never_low = true;
4701
4702 tcpm_set_state(port, tcpm_default_state(port), 0);
4703
4704 if (port->tcpc->get_cc(port->tcpc, &cc1, &cc2) == 0)
4705 _tcpm_cc_change(port, cc1, cc2);
4706
4707 /*
4708 * Some adapters need a clean slate at startup, and won't recover
4709 * otherwise. So do not try to be fancy and force a clean disconnect.
4710 */
4711 tcpm_set_state(port, PORT_RESET, 0);
4712 }
4713
tcpm_port_type_set(struct typec_port * p,enum typec_port_type type)4714 static int tcpm_port_type_set(struct typec_port *p, enum typec_port_type type)
4715 {
4716 struct tcpm_port *port = typec_get_drvdata(p);
4717
4718 mutex_lock(&port->lock);
4719 if (type == port->port_type)
4720 goto port_unlock;
4721
4722 port->port_type = type;
4723
4724 if (!port->connected) {
4725 tcpm_set_state(port, PORT_RESET, 0);
4726 } else if (type == TYPEC_PORT_SNK) {
4727 if (!(port->pwr_role == TYPEC_SINK &&
4728 port->data_role == TYPEC_DEVICE))
4729 tcpm_set_state(port, PORT_RESET, 0);
4730 } else if (type == TYPEC_PORT_SRC) {
4731 if (!(port->pwr_role == TYPEC_SOURCE &&
4732 port->data_role == TYPEC_HOST))
4733 tcpm_set_state(port, PORT_RESET, 0);
4734 }
4735
4736 port_unlock:
4737 mutex_unlock(&port->lock);
4738 return 0;
4739 }
4740
4741 static const struct typec_operations tcpm_ops = {
4742 .try_role = tcpm_try_role,
4743 .dr_set = tcpm_dr_set,
4744 .pr_set = tcpm_pr_set,
4745 .vconn_set = tcpm_vconn_set,
4746 .port_type_set = tcpm_port_type_set
4747 };
4748
tcpm_tcpc_reset(struct tcpm_port * port)4749 void tcpm_tcpc_reset(struct tcpm_port *port)
4750 {
4751 mutex_lock(&port->lock);
4752 /* XXX: Maintain PD connection if possible? */
4753 tcpm_init(port);
4754 mutex_unlock(&port->lock);
4755 }
4756 EXPORT_SYMBOL_GPL(tcpm_tcpc_reset);
4757
tcpm_fw_get_caps(struct tcpm_port * port,struct fwnode_handle * fwnode)4758 static int tcpm_fw_get_caps(struct tcpm_port *port,
4759 struct fwnode_handle *fwnode)
4760 {
4761 const char *cap_str;
4762 int ret;
4763 u32 mw, frs_current;
4764
4765 if (!fwnode)
4766 return -EINVAL;
4767
4768 /* USB data support is optional */
4769 ret = fwnode_property_read_string(fwnode, "data-role", &cap_str);
4770 if (ret == 0) {
4771 ret = typec_find_port_data_role(cap_str);
4772 if (ret < 0)
4773 return ret;
4774 port->typec_caps.data = ret;
4775 }
4776
4777 ret = fwnode_property_read_string(fwnode, "power-role", &cap_str);
4778 if (ret < 0)
4779 return ret;
4780
4781 ret = typec_find_port_power_role(cap_str);
4782 if (ret < 0)
4783 return ret;
4784 port->typec_caps.type = ret;
4785 port->port_type = port->typec_caps.type;
4786
4787 if (port->port_type == TYPEC_PORT_SNK)
4788 goto sink;
4789
4790 /* Get source pdos */
4791 ret = fwnode_property_count_u32(fwnode, "source-pdos");
4792 if (ret <= 0)
4793 return -EINVAL;
4794
4795 port->nr_src_pdo = min(ret, PDO_MAX_OBJECTS);
4796 ret = fwnode_property_read_u32_array(fwnode, "source-pdos",
4797 port->src_pdo, port->nr_src_pdo);
4798 if ((ret < 0) || tcpm_validate_caps(port, port->src_pdo,
4799 port->nr_src_pdo))
4800 return -EINVAL;
4801
4802 if (port->port_type == TYPEC_PORT_SRC)
4803 return 0;
4804
4805 /* Get the preferred power role for DRP */
4806 ret = fwnode_property_read_string(fwnode, "try-power-role", &cap_str);
4807 if (ret < 0)
4808 return ret;
4809
4810 port->typec_caps.prefer_role = typec_find_power_role(cap_str);
4811 if (port->typec_caps.prefer_role < 0)
4812 return -EINVAL;
4813 sink:
4814 /* Get sink pdos */
4815 ret = fwnode_property_count_u32(fwnode, "sink-pdos");
4816 if (ret <= 0)
4817 return -EINVAL;
4818
4819 port->nr_snk_pdo = min(ret, PDO_MAX_OBJECTS);
4820 ret = fwnode_property_read_u32_array(fwnode, "sink-pdos",
4821 port->snk_pdo, port->nr_snk_pdo);
4822 if ((ret < 0) || tcpm_validate_caps(port, port->snk_pdo,
4823 port->nr_snk_pdo))
4824 return -EINVAL;
4825
4826 if (fwnode_property_read_u32(fwnode, "op-sink-microwatt", &mw) < 0)
4827 return -EINVAL;
4828 port->operating_snk_mw = mw / 1000;
4829
4830 port->self_powered = fwnode_property_read_bool(fwnode, "self-powered");
4831
4832 /* FRS can only be supported byb DRP ports */
4833 if (port->port_type == TYPEC_PORT_DRP) {
4834 ret = fwnode_property_read_u32(fwnode, "frs-typec-current", &frs_current);
4835 if (ret >= 0 && frs_current <= FRS_5V_3A)
4836 port->frs_current = frs_current;
4837 }
4838
4839 return 0;
4840 }
4841
4842 /* Power Supply access to expose source power information */
4843 enum tcpm_psy_online_states {
4844 TCPM_PSY_OFFLINE = 0,
4845 TCPM_PSY_FIXED_ONLINE,
4846 TCPM_PSY_PROG_ONLINE,
4847 };
4848
4849 static enum power_supply_property tcpm_psy_props[] = {
4850 POWER_SUPPLY_PROP_USB_TYPE,
4851 POWER_SUPPLY_PROP_ONLINE,
4852 POWER_SUPPLY_PROP_VOLTAGE_MIN,
4853 POWER_SUPPLY_PROP_VOLTAGE_MAX,
4854 POWER_SUPPLY_PROP_VOLTAGE_NOW,
4855 POWER_SUPPLY_PROP_CURRENT_MAX,
4856 POWER_SUPPLY_PROP_CURRENT_NOW,
4857 };
4858
tcpm_psy_get_online(struct tcpm_port * port,union power_supply_propval * val)4859 static int tcpm_psy_get_online(struct tcpm_port *port,
4860 union power_supply_propval *val)
4861 {
4862 if (port->vbus_charge) {
4863 if (port->pps_data.active)
4864 val->intval = TCPM_PSY_PROG_ONLINE;
4865 else
4866 val->intval = TCPM_PSY_FIXED_ONLINE;
4867 } else {
4868 val->intval = TCPM_PSY_OFFLINE;
4869 }
4870
4871 return 0;
4872 }
4873
tcpm_psy_get_voltage_min(struct tcpm_port * port,union power_supply_propval * val)4874 static int tcpm_psy_get_voltage_min(struct tcpm_port *port,
4875 union power_supply_propval *val)
4876 {
4877 if (port->pps_data.active)
4878 val->intval = port->pps_data.min_volt * 1000;
4879 else
4880 val->intval = port->supply_voltage * 1000;
4881
4882 return 0;
4883 }
4884
tcpm_psy_get_voltage_max(struct tcpm_port * port,union power_supply_propval * val)4885 static int tcpm_psy_get_voltage_max(struct tcpm_port *port,
4886 union power_supply_propval *val)
4887 {
4888 if (port->pps_data.active)
4889 val->intval = port->pps_data.max_volt * 1000;
4890 else
4891 val->intval = port->supply_voltage * 1000;
4892
4893 return 0;
4894 }
4895
tcpm_psy_get_voltage_now(struct tcpm_port * port,union power_supply_propval * val)4896 static int tcpm_psy_get_voltage_now(struct tcpm_port *port,
4897 union power_supply_propval *val)
4898 {
4899 val->intval = port->supply_voltage * 1000;
4900
4901 return 0;
4902 }
4903
tcpm_psy_get_current_max(struct tcpm_port * port,union power_supply_propval * val)4904 static int tcpm_psy_get_current_max(struct tcpm_port *port,
4905 union power_supply_propval *val)
4906 {
4907 if (port->pps_data.active)
4908 val->intval = port->pps_data.max_curr * 1000;
4909 else
4910 val->intval = port->current_limit * 1000;
4911
4912 return 0;
4913 }
4914
tcpm_psy_get_current_now(struct tcpm_port * port,union power_supply_propval * val)4915 static int tcpm_psy_get_current_now(struct tcpm_port *port,
4916 union power_supply_propval *val)
4917 {
4918 val->intval = port->current_limit * 1000;
4919
4920 return 0;
4921 }
4922
tcpm_psy_get_prop(struct power_supply * psy,enum power_supply_property psp,union power_supply_propval * val)4923 static int tcpm_psy_get_prop(struct power_supply *psy,
4924 enum power_supply_property psp,
4925 union power_supply_propval *val)
4926 {
4927 struct tcpm_port *port = power_supply_get_drvdata(psy);
4928 int ret = 0;
4929
4930 switch (psp) {
4931 case POWER_SUPPLY_PROP_USB_TYPE:
4932 val->intval = port->usb_type;
4933 break;
4934 case POWER_SUPPLY_PROP_ONLINE:
4935 ret = tcpm_psy_get_online(port, val);
4936 break;
4937 case POWER_SUPPLY_PROP_VOLTAGE_MIN:
4938 ret = tcpm_psy_get_voltage_min(port, val);
4939 break;
4940 case POWER_SUPPLY_PROP_VOLTAGE_MAX:
4941 ret = tcpm_psy_get_voltage_max(port, val);
4942 break;
4943 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
4944 ret = tcpm_psy_get_voltage_now(port, val);
4945 break;
4946 case POWER_SUPPLY_PROP_CURRENT_MAX:
4947 ret = tcpm_psy_get_current_max(port, val);
4948 break;
4949 case POWER_SUPPLY_PROP_CURRENT_NOW:
4950 ret = tcpm_psy_get_current_now(port, val);
4951 break;
4952 default:
4953 ret = -EINVAL;
4954 break;
4955 }
4956
4957 return ret;
4958 }
4959
tcpm_psy_set_online(struct tcpm_port * port,const union power_supply_propval * val)4960 static int tcpm_psy_set_online(struct tcpm_port *port,
4961 const union power_supply_propval *val)
4962 {
4963 int ret;
4964
4965 switch (val->intval) {
4966 case TCPM_PSY_FIXED_ONLINE:
4967 ret = tcpm_pps_activate(port, false);
4968 break;
4969 case TCPM_PSY_PROG_ONLINE:
4970 ret = tcpm_pps_activate(port, true);
4971 break;
4972 default:
4973 ret = -EINVAL;
4974 break;
4975 }
4976
4977 return ret;
4978 }
4979
tcpm_psy_set_prop(struct power_supply * psy,enum power_supply_property psp,const union power_supply_propval * val)4980 static int tcpm_psy_set_prop(struct power_supply *psy,
4981 enum power_supply_property psp,
4982 const union power_supply_propval *val)
4983 {
4984 struct tcpm_port *port = power_supply_get_drvdata(psy);
4985 int ret;
4986
4987 switch (psp) {
4988 case POWER_SUPPLY_PROP_ONLINE:
4989 ret = tcpm_psy_set_online(port, val);
4990 break;
4991 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
4992 if (val->intval < port->pps_data.min_volt * 1000 ||
4993 val->intval > port->pps_data.max_volt * 1000)
4994 ret = -EINVAL;
4995 else
4996 ret = tcpm_pps_set_out_volt(port, val->intval / 1000);
4997 break;
4998 case POWER_SUPPLY_PROP_CURRENT_NOW:
4999 if (val->intval > port->pps_data.max_curr * 1000)
5000 ret = -EINVAL;
5001 else
5002 ret = tcpm_pps_set_op_curr(port, val->intval / 1000);
5003 break;
5004 default:
5005 ret = -EINVAL;
5006 break;
5007 }
5008 power_supply_changed(port->psy);
5009 return ret;
5010 }
5011
tcpm_psy_prop_writeable(struct power_supply * psy,enum power_supply_property psp)5012 static int tcpm_psy_prop_writeable(struct power_supply *psy,
5013 enum power_supply_property psp)
5014 {
5015 switch (psp) {
5016 case POWER_SUPPLY_PROP_ONLINE:
5017 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
5018 case POWER_SUPPLY_PROP_CURRENT_NOW:
5019 return 1;
5020 default:
5021 return 0;
5022 }
5023 }
5024
5025 static enum power_supply_usb_type tcpm_psy_usb_types[] = {
5026 POWER_SUPPLY_USB_TYPE_C,
5027 POWER_SUPPLY_USB_TYPE_PD,
5028 POWER_SUPPLY_USB_TYPE_PD_PPS,
5029 };
5030
5031 static const char *tcpm_psy_name_prefix = "tcpm-source-psy-";
5032
devm_tcpm_psy_register(struct tcpm_port * port)5033 static int devm_tcpm_psy_register(struct tcpm_port *port)
5034 {
5035 struct power_supply_config psy_cfg = {};
5036 const char *port_dev_name = dev_name(port->dev);
5037 size_t psy_name_len = strlen(tcpm_psy_name_prefix) +
5038 strlen(port_dev_name) + 1;
5039 char *psy_name;
5040
5041 psy_cfg.drv_data = port;
5042 psy_cfg.fwnode = dev_fwnode(port->dev);
5043 psy_name = devm_kzalloc(port->dev, psy_name_len, GFP_KERNEL);
5044 if (!psy_name)
5045 return -ENOMEM;
5046
5047 snprintf(psy_name, psy_name_len, "%s%s", tcpm_psy_name_prefix,
5048 port_dev_name);
5049 port->psy_desc.name = psy_name;
5050 port->psy_desc.type = POWER_SUPPLY_TYPE_USB,
5051 port->psy_desc.usb_types = tcpm_psy_usb_types;
5052 port->psy_desc.num_usb_types = ARRAY_SIZE(tcpm_psy_usb_types);
5053 port->psy_desc.properties = tcpm_psy_props,
5054 port->psy_desc.num_properties = ARRAY_SIZE(tcpm_psy_props),
5055 port->psy_desc.get_property = tcpm_psy_get_prop,
5056 port->psy_desc.set_property = tcpm_psy_set_prop,
5057 port->psy_desc.property_is_writeable = tcpm_psy_prop_writeable,
5058
5059 port->usb_type = POWER_SUPPLY_USB_TYPE_C;
5060
5061 port->psy = devm_power_supply_register(port->dev, &port->psy_desc,
5062 &psy_cfg);
5063
5064 return PTR_ERR_OR_ZERO(port->psy);
5065 }
5066
state_machine_timer_handler(struct hrtimer * timer)5067 static enum hrtimer_restart state_machine_timer_handler(struct hrtimer *timer)
5068 {
5069 struct tcpm_port *port = container_of(timer, struct tcpm_port, state_machine_timer);
5070
5071 kthread_queue_work(port->wq, &port->state_machine);
5072 return HRTIMER_NORESTART;
5073 }
5074
vdm_state_machine_timer_handler(struct hrtimer * timer)5075 static enum hrtimer_restart vdm_state_machine_timer_handler(struct hrtimer *timer)
5076 {
5077 struct tcpm_port *port = container_of(timer, struct tcpm_port, vdm_state_machine_timer);
5078
5079 kthread_queue_work(port->wq, &port->vdm_state_machine);
5080 return HRTIMER_NORESTART;
5081 }
5082
enable_frs_timer_handler(struct hrtimer * timer)5083 static enum hrtimer_restart enable_frs_timer_handler(struct hrtimer *timer)
5084 {
5085 struct tcpm_port *port = container_of(timer, struct tcpm_port, enable_frs_timer);
5086
5087 kthread_queue_work(port->wq, &port->enable_frs);
5088 return HRTIMER_NORESTART;
5089 }
5090
tcpm_register_port(struct device * dev,struct tcpc_dev * tcpc)5091 struct tcpm_port *tcpm_register_port(struct device *dev, struct tcpc_dev *tcpc)
5092 {
5093 struct tcpm_port *port;
5094 int err;
5095
5096 if (!dev || !tcpc ||
5097 !tcpc->get_vbus || !tcpc->set_cc || !tcpc->get_cc ||
5098 !tcpc->set_polarity || !tcpc->set_vconn || !tcpc->set_vbus ||
5099 !tcpc->set_pd_rx || !tcpc->set_roles || !tcpc->pd_transmit)
5100 return ERR_PTR(-EINVAL);
5101
5102 port = devm_kzalloc(dev, sizeof(*port), GFP_KERNEL);
5103 if (!port)
5104 return ERR_PTR(-ENOMEM);
5105
5106 port->dev = dev;
5107 port->tcpc = tcpc;
5108
5109 mutex_init(&port->lock);
5110 mutex_init(&port->swap_lock);
5111
5112 port->wq = kthread_create_worker(0, dev_name(dev));
5113 if (IS_ERR(port->wq))
5114 return ERR_CAST(port->wq);
5115 sched_set_fifo(port->wq->task);
5116
5117 kthread_init_work(&port->state_machine, tcpm_state_machine_work);
5118 kthread_init_work(&port->vdm_state_machine, vdm_state_machine_work);
5119 kthread_init_work(&port->event_work, tcpm_pd_event_handler);
5120 kthread_init_work(&port->enable_frs, tcpm_enable_frs_work);
5121 hrtimer_init(&port->state_machine_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
5122 port->state_machine_timer.function = state_machine_timer_handler;
5123 hrtimer_init(&port->vdm_state_machine_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
5124 port->vdm_state_machine_timer.function = vdm_state_machine_timer_handler;
5125 hrtimer_init(&port->enable_frs_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
5126 port->enable_frs_timer.function = enable_frs_timer_handler;
5127
5128 spin_lock_init(&port->pd_event_lock);
5129
5130 init_completion(&port->tx_complete);
5131 init_completion(&port->swap_complete);
5132 init_completion(&port->pps_complete);
5133 tcpm_debugfs_init(port);
5134
5135 err = tcpm_fw_get_caps(port, tcpc->fwnode);
5136 if (err < 0)
5137 goto out_destroy_wq;
5138
5139 port->try_role = port->typec_caps.prefer_role;
5140
5141 port->typec_caps.fwnode = tcpc->fwnode;
5142 port->typec_caps.revision = 0x0120; /* Type-C spec release 1.2 */
5143 port->typec_caps.pd_revision = 0x0300; /* USB-PD spec release 3.0 */
5144 port->typec_caps.driver_data = port;
5145 port->typec_caps.ops = &tcpm_ops;
5146 port->typec_caps.orientation_aware = 1;
5147
5148 port->partner_desc.identity = &port->partner_ident;
5149 port->port_type = port->typec_caps.type;
5150
5151 port->role_sw = usb_role_switch_get(port->dev);
5152 if (IS_ERR(port->role_sw)) {
5153 err = PTR_ERR(port->role_sw);
5154 goto out_destroy_wq;
5155 }
5156
5157 err = devm_tcpm_psy_register(port);
5158 if (err)
5159 goto out_role_sw_put;
5160 power_supply_changed(port->psy);
5161
5162 port->typec_port = typec_register_port(port->dev, &port->typec_caps);
5163 if (IS_ERR(port->typec_port)) {
5164 err = PTR_ERR(port->typec_port);
5165 goto out_role_sw_put;
5166 }
5167
5168 mutex_lock(&port->lock);
5169 tcpm_init(port);
5170 mutex_unlock(&port->lock);
5171
5172 tcpm_log(port, "%s: registered", dev_name(dev));
5173 return port;
5174
5175 out_role_sw_put:
5176 usb_role_switch_put(port->role_sw);
5177 out_destroy_wq:
5178 tcpm_debugfs_exit(port);
5179 kthread_destroy_worker(port->wq);
5180 return ERR_PTR(err);
5181 }
5182 EXPORT_SYMBOL_GPL(tcpm_register_port);
5183
tcpm_unregister_port(struct tcpm_port * port)5184 void tcpm_unregister_port(struct tcpm_port *port)
5185 {
5186 int i;
5187
5188 hrtimer_cancel(&port->enable_frs_timer);
5189 hrtimer_cancel(&port->vdm_state_machine_timer);
5190 hrtimer_cancel(&port->state_machine_timer);
5191
5192 tcpm_reset_port(port);
5193 for (i = 0; i < ARRAY_SIZE(port->port_altmode); i++)
5194 typec_unregister_altmode(port->port_altmode[i]);
5195 typec_unregister_port(port->typec_port);
5196 usb_role_switch_put(port->role_sw);
5197 tcpm_debugfs_exit(port);
5198 kthread_destroy_worker(port->wq);
5199 }
5200 EXPORT_SYMBOL_GPL(tcpm_unregister_port);
5201
5202 MODULE_AUTHOR("Guenter Roeck <groeck@chromium.org>");
5203 MODULE_DESCRIPTION("USB Type-C Port Manager");
5204 MODULE_LICENSE("GPL");
5205