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USB: dummy-hcd: fix power budget for SuperSpeed mode
[linux-block.git] / drivers / usb / typec / tcpm / tcpm.c
CommitLineData
956c36c2 1// SPDX-License-Identifier: GPL-2.0+
f0690a25
GR		 2/*
3 * Copyright 2015-2017 Google, Inc
4 *
f0690a25
GR		 5 * USB Power Delivery protocol stack.
6 */
7
8#include <linux/completion.h>
9#include <linux/debugfs.h>
10#include <linux/device.h>
02d5be46 11#include <linux/jiffies.h>
f0690a25
GR		 12#include <linux/kernel.h>
13#include <linux/module.h>
14#include <linux/mutex.h>
f2a8aa05 15#include <linux/power_supply.h>
f0690a25 16#include <linux/proc_fs.h>
c97a8cc1 17#include <linux/property.h>
f0690a25
GR		 18#include <linux/sched/clock.h>
19#include <linux/seq_file.h>
20#include <linux/slab.h>
21#include <linux/spinlock.h>
9f4bc2ed 22#include <linux/usb.h>
4b4e02c8 23#include <linux/usb/pd.h>
64f7c494 24#include <linux/usb/pd_ado.h>
4b4e02c8 25#include <linux/usb/pd_bdo.h>
64f7c494 26#include <linux/usb/pd_ext_sdb.h>
4b4e02c8 27#include <linux/usb/pd_vdo.h>
2000016c 28#include <linux/usb/role.h>
4b4e02c8 29#include <linux/usb/tcpm.h>
e9576fe8 30#include <linux/usb/typec_altmode.h>
f0690a25
GR		 31#include <linux/workqueue.h>
32
f0690a25
GR		 33#define FOREACH_STATE(S) \
34 S(INVALID_STATE), \
7893f9e1 35 S(TOGGLING), \
f0690a25
GR		 36 S(SRC_UNATTACHED), \
37 S(SRC_ATTACH_WAIT), \
38 S(SRC_ATTACHED), \
39 S(SRC_STARTUP), \
40 S(SRC_SEND_CAPABILITIES), \
976daf9d 41 S(SRC_SEND_CAPABILITIES_TIMEOUT), \
f0690a25
GR		 42 S(SRC_NEGOTIATE_CAPABILITIES), \
43 S(SRC_TRANSITION_SUPPLY), \
44 S(SRC_READY), \
45 S(SRC_WAIT_NEW_CAPABILITIES), \
46 \
47 S(SNK_UNATTACHED), \
48 S(SNK_ATTACH_WAIT), \
49 S(SNK_DEBOUNCED), \
50 S(SNK_ATTACHED), \
51 S(SNK_STARTUP), \
52 S(SNK_DISCOVERY), \
53 S(SNK_DISCOVERY_DEBOUNCE), \
54 S(SNK_DISCOVERY_DEBOUNCE_DONE), \
55 S(SNK_WAIT_CAPABILITIES), \
56 S(SNK_NEGOTIATE_CAPABILITIES), \
2eadc33f 57 S(SNK_NEGOTIATE_PPS_CAPABILITIES), \
f0690a25
GR		 58 S(SNK_TRANSITION_SINK), \
59 S(SNK_TRANSITION_SINK_VBUS), \
60 S(SNK_READY), \
61 \
62 S(ACC_UNATTACHED), \
63 S(DEBUG_ACC_ATTACHED), \
64 S(AUDIO_ACC_ATTACHED), \
65 S(AUDIO_ACC_DEBOUNCE), \
66 \
67 S(HARD_RESET_SEND), \
68 S(HARD_RESET_START), \
69 S(SRC_HARD_RESET_VBUS_OFF), \
70 S(SRC_HARD_RESET_VBUS_ON), \
71 S(SNK_HARD_RESET_SINK_OFF), \
72 S(SNK_HARD_RESET_WAIT_VBUS), \
73 S(SNK_HARD_RESET_SINK_ON), \
74 \
75 S(SOFT_RESET), \
76 S(SOFT_RESET_SEND), \
77 \
78 S(DR_SWAP_ACCEPT), \
79 S(DR_SWAP_SEND), \
80 S(DR_SWAP_SEND_TIMEOUT), \
81 S(DR_SWAP_CANCEL), \
82 S(DR_SWAP_CHANGE_DR), \
83 \
84 S(PR_SWAP_ACCEPT), \
85 S(PR_SWAP_SEND), \
86 S(PR_SWAP_SEND_TIMEOUT), \
87 S(PR_SWAP_CANCEL), \
88 S(PR_SWAP_START), \
89 S(PR_SWAP_SRC_SNK_TRANSITION_OFF), \
90 S(PR_SWAP_SRC_SNK_SOURCE_OFF), \
b965b631 91 S(PR_SWAP_SRC_SNK_SOURCE_OFF_CC_DEBOUNCED), \
f0690a25
GR		 92 S(PR_SWAP_SRC_SNK_SINK_ON), \
93 S(PR_SWAP_SNK_SRC_SINK_OFF), \
94 S(PR_SWAP_SNK_SRC_SOURCE_ON), \
b965b631 95 S(PR_SWAP_SNK_SRC_SOURCE_ON_VBUS_RAMPED_UP), \
f0690a25
GR		 96 \
97 S(VCONN_SWAP_ACCEPT), \
98 S(VCONN_SWAP_SEND), \
99 S(VCONN_SWAP_SEND_TIMEOUT), \
100 S(VCONN_SWAP_CANCEL), \
101 S(VCONN_SWAP_START), \
102 S(VCONN_SWAP_WAIT_FOR_VCONN), \
103 S(VCONN_SWAP_TURN_ON_VCONN), \
104 S(VCONN_SWAP_TURN_OFF_VCONN), \
105 \
106 S(SNK_TRY), \
107 S(SNK_TRY_WAIT), \
a0a3e04e
BJS		 108 S(SNK_TRY_WAIT_DEBOUNCE), \
109 S(SNK_TRY_WAIT_DEBOUNCE_CHECK_VBUS), \
f0690a25 110 S(SRC_TRYWAIT), \
02d5be46 111 S(SRC_TRYWAIT_DEBOUNCE), \
f0690a25
GR		 112 S(SRC_TRYWAIT_UNATTACHED), \
113 \
114 S(SRC_TRY), \
131c7d12 115 S(SRC_TRY_WAIT), \
f0690a25
GR		 116 S(SRC_TRY_DEBOUNCE), \
117 S(SNK_TRYWAIT), \
118 S(SNK_TRYWAIT_DEBOUNCE), \
119 S(SNK_TRYWAIT_VBUS), \
120 S(BIST_RX), \
121 \
64f7c494
AT		 122 S(GET_STATUS_SEND), \
123 S(GET_STATUS_SEND_TIMEOUT), \
124 S(GET_PPS_STATUS_SEND), \
125 S(GET_PPS_STATUS_SEND_TIMEOUT), \
126 \
f0690a25 127 S(ERROR_RECOVERY), \
b17dd571
GR		 128 S(PORT_RESET), \
129 S(PORT_RESET_WAIT_OFF)
f0690a25
GR		 130
131#define GENERATE_ENUM(e) e
132#define GENERATE_STRING(s) #s
133
134enum tcpm_state {
135 FOREACH_STATE(GENERATE_ENUM)
136};
137
138static const char * const tcpm_states[] = {
139 FOREACH_STATE(GENERATE_STRING)
140};
141
142enum vdm_states {
143 VDM_STATE_ERR_BUSY = -3,
144 VDM_STATE_ERR_SEND = -2,
145 VDM_STATE_ERR_TMOUT = -1,
146 VDM_STATE_DONE = 0,
147 /* Anything >0 represents an active state */
148 VDM_STATE_READY = 1,
149 VDM_STATE_BUSY = 2,
150 VDM_STATE_WAIT_RSP_BUSY = 3,
151};
152
153enum pd_msg_request {
154 PD_MSG_NONE = 0,
155 PD_MSG_CTRL_REJECT,
156 PD_MSG_CTRL_WAIT,
64f7c494 157 PD_MSG_CTRL_NOT_SUPP,
f0690a25
GR		 158 PD_MSG_DATA_SINK_CAP,
159 PD_MSG_DATA_SOURCE_CAP,
160};
161
162/* Events from low level driver */
163
164#define TCPM_CC_EVENT BIT(0)
165#define TCPM_VBUS_EVENT BIT(1)
166#define TCPM_RESET_EVENT BIT(2)
167
168#define LOG_BUFFER_ENTRIES 1024
169#define LOG_BUFFER_ENTRY_SIZE 128
170
171/* Alternate mode support */
172
173#define SVID_DISCOVERY_MAX 16
e9576fe8 174#define ALTMODE_DISCOVERY_MAX (SVID_DISCOVERY_MAX * MODE_DISCOVERY_MAX)
f0690a25
GR		 175
176struct pd_mode_data {
177 int svid_index; /* current SVID index */
178 int nsvids;
179 u16 svids[SVID_DISCOVERY_MAX];
180 int altmodes; /* number of alternate modes */
e9576fe8 181 struct typec_altmode_desc altmode_desc[ALTMODE_DISCOVERY_MAX];
f0690a25
GR		 182};
183
2eadc33f
AT		 184struct pd_pps_data {
185 u32 min_volt;
186 u32 max_volt;
187 u32 max_curr;
188 u32 out_volt;
189 u32 op_curr;
190 bool supported;
191 bool active;
192};
193
f0690a25
GR		 194struct tcpm_port {
195 struct device *dev;
196
197 struct mutex lock; /* tcpm state machine lock */
198 struct workqueue_struct *wq;
199
200 struct typec_capability typec_caps;
201 struct typec_port *typec_port;
202
203 struct tcpc_dev *tcpc;
2000016c 204 struct usb_role_switch *role_sw;
f0690a25
GR		 205
206 enum typec_role vconn_role;
207 enum typec_role pwr_role;
208 enum typec_data_role data_role;
209 enum typec_pwr_opmode pwr_opmode;
210
211 struct usb_pd_identity partner_ident;
212 struct typec_partner_desc partner_desc;
213 struct typec_partner *partner;
214
215 enum typec_cc_status cc_req;
216
217 enum typec_cc_status cc1;
218 enum typec_cc_status cc2;
219 enum typec_cc_polarity polarity;
220
221 bool attached;
222 bool connected;
9b0ae699 223 enum typec_port_type port_type;
f0690a25
GR		 224 bool vbus_present;
225 bool vbus_never_low;
226 bool vbus_source;
227 bool vbus_charge;
228
229 bool send_discover;
230 bool op_vsafe5v;
231
232 int try_role;
233 int try_snk_count;
234 int try_src_count;
235
236 enum pd_msg_request queued_message;
237
238 enum tcpm_state enter_state;
239 enum tcpm_state prev_state;
240 enum tcpm_state state;
241 enum tcpm_state delayed_state;
242 unsigned long delayed_runtime;
243 unsigned long delay_ms;
244
245 spinlock_t pd_event_lock;
246 u32 pd_events;
247
248 struct work_struct event_work;
249 struct delayed_work state_machine;
250 struct delayed_work vdm_state_machine;
251 bool state_machine_running;
252
253 struct completion tx_complete;
254 enum tcpm_transmit_status tx_status;
255
256 struct mutex swap_lock; /* swap command lock */
257 bool swap_pending;
b17dd571 258 bool non_pd_role_swap;
f0690a25
GR		 259 struct completion swap_complete;
260 int swap_status;
261
2eadc33f 262 unsigned int negotiated_rev;
f0690a25
GR		 263 unsigned int message_id;
264 unsigned int caps_count;
265 unsigned int hard_reset_count;
266 bool pd_capable;
267 bool explicit_contract;
5fec4b54 268 unsigned int rx_msgid;
f0690a25
GR		 269
270 /* Partner capabilities/requests */
271 u32 sink_request;
272 u32 source_caps[PDO_MAX_OBJECTS];
273 unsigned int nr_source_caps;
274 u32 sink_caps[PDO_MAX_OBJECTS];
275 unsigned int nr_sink_caps;
276
277 /* Local capabilities */
278 u32 src_pdo[PDO_MAX_OBJECTS];
279 unsigned int nr_src_pdo;
280 u32 snk_pdo[PDO_MAX_OBJECTS];
281 unsigned int nr_snk_pdo;
193a6801
GR		 282 u32 snk_vdo[VDO_MAX_OBJECTS];
283 unsigned int nr_snk_vdo;
f0690a25 284
f0690a25 285 unsigned int operating_snk_mw;
2eadc33f 286 bool update_sink_caps;
f0690a25
GR		 287
288 /* Requested current / voltage */
289 u32 current_limit;
290 u32 supply_voltage;
291
f2a8aa05
AT		 292 /* Used to export TA voltage and current */
293 struct power_supply *psy;
294 struct power_supply_desc psy_desc;
295 enum power_supply_usb_type usb_type;
296
f0690a25
GR		 297 u32 bist_request;
298
299 /* PD state for Vendor Defined Messages */
300 enum vdm_states vdm_state;
301 u32 vdm_retries;
302 /* next Vendor Defined Message to send */
303 u32 vdo_data[VDO_MAX_SIZE];
304 u8 vdo_count;
305 /* VDO to retry if UFP responder replied busy */
306 u32 vdo_retry;
307
2eadc33f
AT		 308 /* PPS */
309 struct pd_pps_data pps_data;
310 struct completion pps_complete;
311 bool pps_pending;
312 int pps_status;
f0690a25 313
2eadc33f 314 /* Alternate mode data */
f0690a25 315 struct pd_mode_data mode_data;
e9576fe8
HK		 316 struct typec_altmode *partner_altmode[ALTMODE_DISCOVERY_MAX];
317 struct typec_altmode *port_altmode[ALTMODE_DISCOVERY_MAX];
f0690a25 318
02d5be46
BJS		 319 /* Deadline in jiffies to exit src_try_wait state */
320 unsigned long max_wait;
321
23b5f732
BJS		 322 /* port belongs to a self powered device */
323 bool self_powered;
324
f0690a25
GR		 325#ifdef CONFIG_DEBUG_FS
326 struct dentry *dentry;
327 struct mutex logbuffer_lock; /* log buffer access lock */
328 int logbuffer_head;
329 int logbuffer_tail;
330 u8 *logbuffer[LOG_BUFFER_ENTRIES];
331#endif
332};
333
334struct pd_rx_event {
335 struct work_struct work;
336 struct tcpm_port *port;
337 struct pd_message msg;
338};
339
340#define tcpm_cc_is_sink(cc) \
341 ((cc) == TYPEC_CC_RP_DEF || (cc) == TYPEC_CC_RP_1_5 || \
342 (cc) == TYPEC_CC_RP_3_0)
343
344#define tcpm_port_is_sink(port) \
345 ((tcpm_cc_is_sink((port)->cc1) && !tcpm_cc_is_sink((port)->cc2)) || \
346 (tcpm_cc_is_sink((port)->cc2) && !tcpm_cc_is_sink((port)->cc1)))
347
348#define tcpm_cc_is_source(cc) ((cc) == TYPEC_CC_RD)
349#define tcpm_cc_is_audio(cc) ((cc) == TYPEC_CC_RA)
350#define tcpm_cc_is_open(cc) ((cc) == TYPEC_CC_OPEN)
351
352#define tcpm_port_is_source(port) \
353 ((tcpm_cc_is_source((port)->cc1) && \
354 !tcpm_cc_is_source((port)->cc2)) || \
355 (tcpm_cc_is_source((port)->cc2) && \
356 !tcpm_cc_is_source((port)->cc1)))
357
358#define tcpm_port_is_debug(port) \
359 (tcpm_cc_is_source((port)->cc1) && tcpm_cc_is_source((port)->cc2))
360
361#define tcpm_port_is_audio(port) \
362 (tcpm_cc_is_audio((port)->cc1) && tcpm_cc_is_audio((port)->cc2))
363
364#define tcpm_port_is_audio_detached(port) \
365 ((tcpm_cc_is_audio((port)->cc1) && tcpm_cc_is_open((port)->cc2)) || \
366 (tcpm_cc_is_audio((port)->cc2) && tcpm_cc_is_open((port)->cc1)))
367
368#define tcpm_try_snk(port) \
ff6c8cb1
BJS		 369 ((port)->try_snk_count == 0 && (port)->try_role == TYPEC_SINK && \
370 (port)->port_type == TYPEC_PORT_DRP)
f0690a25
GR		 371
372#define tcpm_try_src(port) \
ff6c8cb1
BJS		 373 ((port)->try_src_count == 0 && (port)->try_role == TYPEC_SOURCE && \
374 (port)->port_type == TYPEC_PORT_DRP)
f0690a25
GR		 375
376static enum tcpm_state tcpm_default_state(struct tcpm_port *port)
377{
9b0ae699 378 if (port->port_type == TYPEC_PORT_DRP) {
b46a9c90
BJS		 379 if (port->try_role == TYPEC_SINK)
380 return SNK_UNATTACHED;
381 else if (port->try_role == TYPEC_SOURCE)
382 return SRC_UNATTACHED;
1957de95
GR		 383 else if (port->tcpc->config &&
384 port->tcpc->config->default_role == TYPEC_SINK)
b46a9c90
BJS		 385 return SNK_UNATTACHED;
386 /* Fall through to return SRC_UNATTACHED */
ceeb1625 387 } else if (port->port_type == TYPEC_PORT_SNK) {
f0690a25 388 return SNK_UNATTACHED;
b46a9c90 389 }
f0690a25
GR		 390 return SRC_UNATTACHED;
391}
392
393static inline
394struct tcpm_port *typec_cap_to_tcpm(const struct typec_capability *cap)
395{
396 return container_of(cap, struct tcpm_port, typec_caps);
397}
398
399static bool tcpm_port_is_disconnected(struct tcpm_port *port)
400{
401 return (!port->attached && port->cc1 == TYPEC_CC_OPEN &&
402 port->cc2 == TYPEC_CC_OPEN) ||
403 (port->attached && ((port->polarity == TYPEC_POLARITY_CC1 &&
404 port->cc1 == TYPEC_CC_OPEN) ||
405 (port->polarity == TYPEC_POLARITY_CC2 &&
406 port->cc2 == TYPEC_CC_OPEN)));
407}
408
409/*
410 * Logging
411 */
412
413#ifdef CONFIG_DEBUG_FS
414
415static bool tcpm_log_full(struct tcpm_port *port)
416{
417 return port->logbuffer_tail ==
418 (port->logbuffer_head + 1) % LOG_BUFFER_ENTRIES;
419}
420
e79e0125 421__printf(2, 0)
f0690a25
GR		 422static void _tcpm_log(struct tcpm_port *port, const char *fmt, va_list args)
423{
424 char tmpbuffer[LOG_BUFFER_ENTRY_SIZE];
425 u64 ts_nsec = local_clock();
426 unsigned long rem_nsec;
427
d5a4f935 428 mutex_lock(&port->logbuffer_lock);
f0690a25
GR		 429 if (!port->logbuffer[port->logbuffer_head]) {
430 port->logbuffer[port->logbuffer_head] =
431 kzalloc(LOG_BUFFER_ENTRY_SIZE, GFP_KERNEL);
d5a4f935
PC		 432 if (!port->logbuffer[port->logbuffer_head]) {
433 mutex_unlock(&port->logbuffer_lock);
f0690a25 434 return;
d5a4f935 435 }
f0690a25
GR		 436 }
437
438 vsnprintf(tmpbuffer, sizeof(tmpbuffer), fmt, args);
439
f0690a25
GR		 440 if (tcpm_log_full(port)) {
441 port->logbuffer_head = max(port->logbuffer_head - 1, 0);
442 strcpy(tmpbuffer, "overflow");
443 }
444
445 if (port->logbuffer_head < 0 ||
446 port->logbuffer_head >= LOG_BUFFER_ENTRIES) {
447 dev_warn(port->dev,
448 "Bad log buffer index %d\n", port->logbuffer_head);
449 goto abort;
450 }
451
452 if (!port->logbuffer[port->logbuffer_head]) {
453 dev_warn(port->dev,
454 "Log buffer index %d is NULL\n", port->logbuffer_head);
455 goto abort;
456 }
457
458 rem_nsec = do_div(ts_nsec, 1000000000);
459 scnprintf(port->logbuffer[port->logbuffer_head],
460 LOG_BUFFER_ENTRY_SIZE, "[%5lu.%06lu] %s",
461 (unsigned long)ts_nsec, rem_nsec / 1000,
462 tmpbuffer);
463 port->logbuffer_head = (port->logbuffer_head + 1) % LOG_BUFFER_ENTRIES;
464
465abort:
466 mutex_unlock(&port->logbuffer_lock);
467}
468
e79e0125 469__printf(2, 3)
f0690a25
GR		 470static void tcpm_log(struct tcpm_port *port, const char *fmt, ...)
471{
472 va_list args;
473
474 /* Do not log while disconnected and unattached */
475 if (tcpm_port_is_disconnected(port) &&
476 (port->state == SRC_UNATTACHED || port->state == SNK_UNATTACHED ||
7893f9e1 477 port->state == TOGGLING))
f0690a25
GR		 478 return;
479
480 va_start(args, fmt);
481 _tcpm_log(port, fmt, args);
482 va_end(args);
483}
484
e79e0125 485__printf(2, 3)
f0690a25
GR		 486static void tcpm_log_force(struct tcpm_port *port, const char *fmt, ...)
487{
488 va_list args;
489
490 va_start(args, fmt);
491 _tcpm_log(port, fmt, args);
492 va_end(args);
493}
494
495static void tcpm_log_source_caps(struct tcpm_port *port)
496{
497 int i;
498
499 for (i = 0; i < port->nr_source_caps; i++) {
500 u32 pdo = port->source_caps[i];
501 enum pd_pdo_type type = pdo_type(pdo);
502 char msg[64];
503
504 switch (type) {
505 case PDO_TYPE_FIXED:
506 scnprintf(msg, sizeof(msg),
507 "%u mV, %u mA [%s%s%s%s%s%s]",
508 pdo_fixed_voltage(pdo),
509 pdo_max_current(pdo),
510 (pdo & PDO_FIXED_DUAL_ROLE) ?
511 "R" : "",
512 (pdo & PDO_FIXED_SUSPEND) ?
513 "S" : "",
514 (pdo & PDO_FIXED_HIGHER_CAP) ?
515 "H" : "",
516 (pdo & PDO_FIXED_USB_COMM) ?
517 "U" : "",
518 (pdo & PDO_FIXED_DATA_SWAP) ?
519 "D" : "",
520 (pdo & PDO_FIXED_EXTPOWER) ?
521 "E" : "");
522 break;
523 case PDO_TYPE_VAR:
524 scnprintf(msg, sizeof(msg),
525 "%u-%u mV, %u mA",
526 pdo_min_voltage(pdo),
527 pdo_max_voltage(pdo),
528 pdo_max_current(pdo));
529 break;
530 case PDO_TYPE_BATT:
531 scnprintf(msg, sizeof(msg),
532 "%u-%u mV, %u mW",
533 pdo_min_voltage(pdo),
534 pdo_max_voltage(pdo),
535 pdo_max_power(pdo));
536 break;
2eadc33f
AT		 537 case PDO_TYPE_APDO:
538 if (pdo_apdo_type(pdo) == APDO_TYPE_PPS)
539 scnprintf(msg, sizeof(msg),
540 "%u-%u mV, %u mA",
541 pdo_pps_apdo_min_voltage(pdo),
542 pdo_pps_apdo_max_voltage(pdo),
543 pdo_pps_apdo_max_current(pdo));
544 else
545 strcpy(msg, "undefined APDO");
546 break;
f0690a25
GR		 547 default:
548 strcpy(msg, "undefined");
549 break;
550 }
551 tcpm_log(port, " PDO %d: type %d, %s",
552 i, type, msg);
553 }
554}
555
9e902c59 556static int tcpm_debug_show(struct seq_file *s, void *v)
f0690a25
GR		 557{
558 struct tcpm_port *port = (struct tcpm_port *)s->private;
559 int tail;
560
561 mutex_lock(&port->logbuffer_lock);
562 tail = port->logbuffer_tail;
563 while (tail != port->logbuffer_head) {
564 seq_printf(s, "%s\n", port->logbuffer[tail]);
565 tail = (tail + 1) % LOG_BUFFER_ENTRIES;
566 }
567 if (!seq_has_overflowed(s))
568 port->logbuffer_tail = tail;
569 mutex_unlock(&port->logbuffer_lock);
570
571 return 0;
572}
9e902c59 573DEFINE_SHOW_ATTRIBUTE(tcpm_debug);
f0690a25 574
a941fc39 575static void tcpm_debugfs_init(struct tcpm_port *port)
f0690a25 576{
9f4bc2ed 577 char name[NAME_MAX];
f0690a25 578
9f4bc2ed
HG		 579 mutex_init(&port->logbuffer_lock);
580 snprintf(name, NAME_MAX, "tcpm-%s", dev_name(port->dev));
581 port->dentry = debugfs_create_file(name, S_IFREG | 0444, usb_debug_root,
9e902c59 582 port, &tcpm_debug_fops);
f0690a25
GR		 583}
584
585static void tcpm_debugfs_exit(struct tcpm_port *port)
586{
fd5da3e2
LJ		 587 int i;
588
589 mutex_lock(&port->logbuffer_lock);
590 for (i = 0; i < LOG_BUFFER_ENTRIES; i++) {
591 kfree(port->logbuffer[i]);
592 port->logbuffer[i] = NULL;
593 }
594 mutex_unlock(&port->logbuffer_lock);
595
f0690a25
GR		 596 debugfs_remove(port->dentry);
597}
598
599#else
600
e79e0125 601__printf(2, 3)
f0690a25 602static void tcpm_log(const struct tcpm_port *port, const char *fmt, ...) { }
e79e0125 603__printf(2, 3)
f0690a25
GR		 604static void tcpm_log_force(struct tcpm_port *port, const char *fmt, ...) { }
605static void tcpm_log_source_caps(struct tcpm_port *port) { }
a941fc39 606static void tcpm_debugfs_init(const struct tcpm_port *port) { }
f0690a25
GR		 607static void tcpm_debugfs_exit(const struct tcpm_port *port) { }
608
609#endif
610
611static int tcpm_pd_transmit(struct tcpm_port *port,
612 enum tcpm_transmit_type type,
613 const struct pd_message *msg)
614{
615 unsigned long timeout;
616 int ret;
617
618 if (msg)
619 tcpm_log(port, "PD TX, header: %#x", le16_to_cpu(msg->header));
620 else
621 tcpm_log(port, "PD TX, type: %#x", type);
622
623 reinit_completion(&port->tx_complete);
624 ret = port->tcpc->pd_transmit(port->tcpc, type, msg);
625 if (ret < 0)
626 return ret;
627
628 mutex_unlock(&port->lock);
629 timeout = wait_for_completion_timeout(&port->tx_complete,
630 msecs_to_jiffies(PD_T_TCPC_TX_TIMEOUT));
631 mutex_lock(&port->lock);
632 if (!timeout)
633 return -ETIMEDOUT;
634
635 switch (port->tx_status) {
636 case TCPC_TX_SUCCESS:
637 port->message_id = (port->message_id + 1) & PD_HEADER_ID_MASK;
638 return 0;
639 case TCPC_TX_DISCARDED:
640 return -EAGAIN;
641 case TCPC_TX_FAILED:
642 default:
643 return -EIO;
644 }
645}
646
647void tcpm_pd_transmit_complete(struct tcpm_port *port,
648 enum tcpm_transmit_status status)
649{
650 tcpm_log(port, "PD TX complete, status: %u", status);
651 port->tx_status = status;
652 complete(&port->tx_complete);
653}
654EXPORT_SYMBOL_GPL(tcpm_pd_transmit_complete);
655
e9576fe8 656static int tcpm_mux_set(struct tcpm_port *port, int state,
2000016c
HG		 657 enum usb_role usb_role,
658 enum typec_orientation orientation)
f0690a25 659{
2000016c 660 int ret;
f0690a25 661
e9576fe8
HK		 662 tcpm_log(port, "Requesting mux state %d, usb-role %d, orientation %d",
663 state, usb_role, orientation);
f0690a25 664
2000016c
HG		 665 ret = typec_set_orientation(port->typec_port, orientation);
666 if (ret)
667 return ret;
f0690a25 668
2000016c
HG		 669 if (port->role_sw) {
670 ret = usb_role_switch_set_role(port->role_sw, usb_role);
671 if (ret)
672 return ret;
673 }
674
e9576fe8 675 return typec_set_mode(port->typec_port, state);
f0690a25
GR		 676}
677
678static int tcpm_set_polarity(struct tcpm_port *port,
679 enum typec_cc_polarity polarity)
680{
681 int ret;
682
683 tcpm_log(port, "polarity %d", polarity);
684
685 ret = port->tcpc->set_polarity(port->tcpc, polarity);
686 if (ret < 0)
687 return ret;
688
689 port->polarity = polarity;
690
691 return 0;
692}
693
694static int tcpm_set_vconn(struct tcpm_port *port, bool enable)
695{
696 int ret;
697
698 tcpm_log(port, "vconn:=%d", enable);
699
700 ret = port->tcpc->set_vconn(port->tcpc, enable);
701 if (!ret) {
702 port->vconn_role = enable ? TYPEC_SOURCE : TYPEC_SINK;
703 typec_set_vconn_role(port->typec_port, port->vconn_role);
704 }
705
706 return ret;
707}
708
709static u32 tcpm_get_current_limit(struct tcpm_port *port)
710{
711 enum typec_cc_status cc;
712 u32 limit;
713
714 cc = port->polarity ? port->cc2 : port->cc1;
715 switch (cc) {
716 case TYPEC_CC_RP_1_5:
717 limit = 1500;
718 break;
719 case TYPEC_CC_RP_3_0:
720 limit = 3000;
721 break;
722 case TYPEC_CC_RP_DEF:
723 default:
ea62cfc7
HG		 724 if (port->tcpc->get_current_limit)
725 limit = port->tcpc->get_current_limit(port->tcpc);
726 else
727 limit = 0;
f0690a25
GR		 728 break;
729 }
730
731 return limit;
732}
733
734static int tcpm_set_current_limit(struct tcpm_port *port, u32 max_ma, u32 mv)
735{
736 int ret = -EOPNOTSUPP;
737
738 tcpm_log(port, "Setting voltage/current limit %u mV %u mA", mv, max_ma);
739
146971e6
HG		 740 port->supply_voltage = mv;
741 port->current_limit = max_ma;
742
f0690a25
GR		 743 if (port->tcpc->set_current_limit)
744 ret = port->tcpc->set_current_limit(port->tcpc, max_ma, mv);
745
746 return ret;
747}
748
749/*
750 * Determine RP value to set based on maximum current supported
751 * by a port if configured as source.
752 * Returns CC value to report to link partner.
753 */
754static enum typec_cc_status tcpm_rp_cc(struct tcpm_port *port)
755{
756 const u32 *src_pdo = port->src_pdo;
757 int nr_pdo = port->nr_src_pdo;
758 int i;
759
760 /*
761 * Search for first entry with matching voltage.
762 * It should report the maximum supported current.
763 */
764 for (i = 0; i < nr_pdo; i++) {
765 const u32 pdo = src_pdo[i];
766
767 if (pdo_type(pdo) == PDO_TYPE_FIXED &&
768 pdo_fixed_voltage(pdo) == 5000) {
769 unsigned int curr = pdo_max_current(pdo);
770
771 if (curr >= 3000)
772 return TYPEC_CC_RP_3_0;
773 else if (curr >= 1500)
774 return TYPEC_CC_RP_1_5;
775 return TYPEC_CC_RP_DEF;
776 }
777 }
778
779 return TYPEC_CC_RP_DEF;
780}
781
782static int tcpm_set_attached_state(struct tcpm_port *port, bool attached)
783{
784 return port->tcpc->set_roles(port->tcpc, attached, port->pwr_role,
785 port->data_role);
786}
787
788static int tcpm_set_roles(struct tcpm_port *port, bool attached,
789 enum typec_role role, enum typec_data_role data)
790{
2000016c 791 enum typec_orientation orientation;
c6962c29 792 enum usb_role usb_role;
f0690a25
GR		 793 int ret;
794
2000016c
HG		 795 if (port->polarity == TYPEC_POLARITY_CC1)
796 orientation = TYPEC_ORIENTATION_NORMAL;
797 else
798 orientation = TYPEC_ORIENTATION_REVERSE;
799
f0690a25 800 if (data == TYPEC_HOST)
c6962c29 801 usb_role = USB_ROLE_HOST;
f0690a25 802 else
c6962c29
HG		 803 usb_role = USB_ROLE_DEVICE;
804
e9576fe8 805 ret = tcpm_mux_set(port, TYPEC_STATE_USB, usb_role, orientation);
f0690a25
GR		 806 if (ret < 0)
807 return ret;
808
809 ret = port->tcpc->set_roles(port->tcpc, attached, role, data);
810 if (ret < 0)
811 return ret;
812
813 port->pwr_role = role;
814 port->data_role = data;
815 typec_set_data_role(port->typec_port, data);
816 typec_set_pwr_role(port->typec_port, role);
817
818 return 0;
819}
820
821static int tcpm_set_pwr_role(struct tcpm_port *port, enum typec_role role)
822{
823 int ret;
824
825 ret = port->tcpc->set_roles(port->tcpc, true, role,
826 port->data_role);
827 if (ret < 0)
828 return ret;
829
830 port->pwr_role = role;
831 typec_set_pwr_role(port->typec_port, role);
832
833 return 0;
834}
835
836static int tcpm_pd_send_source_caps(struct tcpm_port *port)
837{
838 struct pd_message msg;
839 int i;
840
841 memset(&msg, 0, sizeof(msg));
842 if (!port->nr_src_pdo) {
843 /* No source capabilities defined, sink only */
844 msg.header = PD_HEADER_LE(PD_CTRL_REJECT,
845 port->pwr_role,
846 port->data_role,
2eadc33f 847 port->negotiated_rev,
f0690a25
GR		 848 port->message_id, 0);
849 } else {
850 msg.header = PD_HEADER_LE(PD_DATA_SOURCE_CAP,
851 port->pwr_role,
852 port->data_role,
2eadc33f 853 port->negotiated_rev,
f0690a25
GR		 854 port->message_id,
855 port->nr_src_pdo);
856 }
857 for (i = 0; i < port->nr_src_pdo; i++)
858 msg.payload[i] = cpu_to_le32(port->src_pdo[i]);
859
860 return tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
861}
862
863static int tcpm_pd_send_sink_caps(struct tcpm_port *port)
864{
865 struct pd_message msg;
866 int i;
867
868 memset(&msg, 0, sizeof(msg));
869 if (!port->nr_snk_pdo) {
870 /* No sink capabilities defined, source only */
871 msg.header = PD_HEADER_LE(PD_CTRL_REJECT,
872 port->pwr_role,
873 port->data_role,
2eadc33f 874 port->negotiated_rev,
f0690a25
GR		 875 port->message_id, 0);
876 } else {
877 msg.header = PD_HEADER_LE(PD_DATA_SINK_CAP,
878 port->pwr_role,
879 port->data_role,
2eadc33f 880 port->negotiated_rev,
f0690a25
GR		 881 port->message_id,
882 port->nr_snk_pdo);
883 }
884 for (i = 0; i < port->nr_snk_pdo; i++)
885 msg.payload[i] = cpu_to_le32(port->snk_pdo[i]);
886
887 return tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
888}
889
890static void tcpm_set_state(struct tcpm_port *port, enum tcpm_state state,
891 unsigned int delay_ms)
892{
893 if (delay_ms) {
894 tcpm_log(port, "pending state change %s -> %s @ %u ms",
895 tcpm_states[port->state], tcpm_states[state],
896 delay_ms);
897 port->delayed_state = state;
898 mod_delayed_work(port->wq, &port->state_machine,
899 msecs_to_jiffies(delay_ms));
900 port->delayed_runtime = jiffies + msecs_to_jiffies(delay_ms);
901 port->delay_ms = delay_ms;
902 } else {
903 tcpm_log(port, "state change %s -> %s",
904 tcpm_states[port->state], tcpm_states[state]);
905 port->delayed_state = INVALID_STATE;
906 port->prev_state = port->state;
907 port->state = state;
908 /*
909 * Don't re-queue the state machine work item if we're currently
910 * in the state machine and we're immediately changing states.
911 * tcpm_state_machine_work() will continue running the state
912 * machine.
913 */
914 if (!port->state_machine_running)
915 mod_delayed_work(port->wq, &port->state_machine, 0);
916 }
917}
918
919static void tcpm_set_state_cond(struct tcpm_port *port, enum tcpm_state state,
920 unsigned int delay_ms)
921{
922 if (port->enter_state == port->state)
923 tcpm_set_state(port, state, delay_ms);
924 else
925 tcpm_log(port,
926 "skipped %sstate change %s -> %s [%u ms], context state %s",
927 delay_ms ? "delayed " : "",
928 tcpm_states[port->state], tcpm_states[state],
929 delay_ms, tcpm_states[port->enter_state]);
930}
931
932static void tcpm_queue_message(struct tcpm_port *port,
933 enum pd_msg_request message)
934{
935 port->queued_message = message;
936 mod_delayed_work(port->wq, &port->state_machine, 0);
937}
938
939/*
940 * VDM/VDO handling functions
941 */
942static void tcpm_queue_vdm(struct tcpm_port *port, const u32 header,
943 const u32 *data, int cnt)
944{
945 port->vdo_count = cnt + 1;
946 port->vdo_data[0] = header;
947 memcpy(&port->vdo_data[1], data, sizeof(u32) * cnt);
948 /* Set ready, vdm state machine will actually send */
949 port->vdm_retries = 0;
950 port->vdm_state = VDM_STATE_READY;
951}
952
953static void svdm_consume_identity(struct tcpm_port *port, const __le32 *payload,
954 int cnt)
955{
956 u32 vdo = le32_to_cpu(payload[VDO_INDEX_IDH]);
957 u32 product = le32_to_cpu(payload[VDO_INDEX_PRODUCT]);
958
959 memset(&port->mode_data, 0, sizeof(port->mode_data));
960
f0690a25
GR		 961 port->partner_ident.id_header = vdo;
962 port->partner_ident.cert_stat = le32_to_cpu(payload[VDO_INDEX_CSTAT]);
963 port->partner_ident.product = product;
964
965 typec_partner_set_identity(port->partner);
966
967 tcpm_log(port, "Identity: %04x:%04x.%04x",
968 PD_IDH_VID(vdo),
969 PD_PRODUCT_PID(product), product & 0xffff);
970}
971
972static bool svdm_consume_svids(struct tcpm_port *port, const __le32 *payload,
973 int cnt)
974{
975 struct pd_mode_data *pmdata = &port->mode_data;
976 int i;
977
978 for (i = 1; i < cnt; i++) {
979 u32 p = le32_to_cpu(payload[i]);
980 u16 svid;
981
982 svid = (p >> 16) & 0xffff;
983 if (!svid)
984 return false;
985
986 if (pmdata->nsvids >= SVID_DISCOVERY_MAX)
987 goto abort;
988
989 pmdata->svids[pmdata->nsvids++] = svid;
990 tcpm_log(port, "SVID %d: 0x%x", pmdata->nsvids, svid);
991
992 svid = p & 0xffff;
993 if (!svid)
994 return false;
995
996 if (pmdata->nsvids >= SVID_DISCOVERY_MAX)
997 goto abort;
998
999 pmdata->svids[pmdata->nsvids++] = svid;
1000 tcpm_log(port, "SVID %d: 0x%x", pmdata->nsvids, svid);
1001 }
1002 return true;
1003abort:
1004 tcpm_log(port, "SVID_DISCOVERY_MAX(%d) too low!", SVID_DISCOVERY_MAX);
1005 return false;
1006}
1007
1008static void svdm_consume_modes(struct tcpm_port *port, const __le32 *payload,
1009 int cnt)
1010{
1011 struct pd_mode_data *pmdata = &port->mode_data;
1012 struct typec_altmode_desc *paltmode;
f0690a25
GR		 1013 int i;
1014
1015 if (pmdata->altmodes >= ARRAY_SIZE(port->partner_altmode)) {
1016 /* Already logged in svdm_consume_svids() */
1017 return;
1018 }
1019
4ab8c18d
HK		 1020 for (i = 1; i < cnt; i++) {
1021 paltmode = &pmdata->altmode_desc[pmdata->altmodes];
1022 memset(paltmode, 0, sizeof(*paltmode));
1023
1024 paltmode->svid = pmdata->svids[pmdata->svid_index];
1025 paltmode->mode = i;
1026 paltmode->vdo = le32_to_cpu(payload[i]);
1027
1028 tcpm_log(port, " Alternate mode %d: SVID 0x%04x, VDO %d: 0x%08x",
1029 pmdata->altmodes, paltmode->svid,
1030 paltmode->mode, paltmode->vdo);
1031
4ab8c18d 1032 pmdata->altmodes++;
f0690a25 1033 }
f0690a25
GR		 1034}
1035
e9576fe8
HK		 1036static void tcpm_register_partner_altmodes(struct tcpm_port *port)
1037{
1038 struct pd_mode_data *modep = &port->mode_data;
1039 struct typec_altmode *altmode;
1040 int i;
1041
1042 for (i = 0; i < modep->altmodes; i++) {
1043 altmode = typec_partner_register_altmode(port->partner,
1044 &modep->altmode_desc[i]);
1045 if (!altmode)
1046 tcpm_log(port, "Failed to register partner SVID 0x%04x",
1047 modep->altmode_desc[i].svid);
1048 port->partner_altmode[i] = altmode;
1049 }
1050}
1051
f0690a25
GR		 1052#define supports_modal(port) PD_IDH_MODAL_SUPP((port)->partner_ident.id_header)
1053
1054static int tcpm_pd_svdm(struct tcpm_port *port, const __le32 *payload, int cnt,
1055 u32 *response)
1056{
e9576fe8
HK		 1057 struct typec_altmode *adev;
1058 struct typec_altmode *pdev;
f0690a25 1059 struct pd_mode_data *modep;
e9576fe8 1060 u32 p[PD_MAX_PAYLOAD];
f0690a25 1061 int rlen = 0;
e9576fe8
HK		 1062 int cmd_type;
1063 int cmd;
193a6801 1064 int i;
f0690a25 1065
e9576fe8
HK		 1066 for (i = 0; i < cnt; i++)
1067 p[i] = le32_to_cpu(payload[i]);
1068
1069 cmd_type = PD_VDO_CMDT(p[0]);
1070 cmd = PD_VDO_CMD(p[0]);
1071
f0690a25 1072 tcpm_log(port, "Rx VDM cmd 0x%x type %d cmd %d len %d",
e9576fe8 1073 p[0], cmd_type, cmd, cnt);
f0690a25
GR		 1074
1075 modep = &port->mode_data;
1076
e9576fe8
HK		 1077 adev = typec_match_altmode(port->port_altmode, ALTMODE_DISCOVERY_MAX,
1078 PD_VDO_VID(p[0]), PD_VDO_OPOS(p[0]));
1079
1080 pdev = typec_match_altmode(port->partner_altmode, ALTMODE_DISCOVERY_MAX,
1081 PD_VDO_VID(p[0]), PD_VDO_OPOS(p[0]));
1082
f0690a25
GR		 1083 switch (cmd_type) {
1084 case CMDT_INIT:
1085 switch (cmd) {
1086 case CMD_DISCOVER_IDENT:
193a6801
GR		 1087 /* 6.4.4.3.1: Only respond as UFP (device) */
1088 if (port->data_role == TYPEC_DEVICE &&
1089 port->nr_snk_vdo) {
1090 for (i = 0; i < port->nr_snk_vdo; i++)
cbe5843e 1091 response[i + 1] = port->snk_vdo[i];
193a6801
GR		 1092 rlen = port->nr_snk_vdo + 1;
1093 }
f0690a25
GR		 1094 break;
1095 case CMD_DISCOVER_SVID:
1096 break;
1097 case CMD_DISCOVER_MODES:
1098 break;
1099 case CMD_ENTER_MODE:
1100 break;
1101 case CMD_EXIT_MODE:
1102 break;
1103 case CMD_ATTENTION:
e9576fe8 1104 /* Attention command does not have response */
88d02c9b
GR		 1105 if (adev)
1106 typec_altmode_attention(adev, p[1]);
e9576fe8 1107 return 0;
f0690a25
GR		 1108 default:
1109 break;
1110 }
1111 if (rlen >= 1) {
e9576fe8 1112 response[0] = p[0] | VDO_CMDT(CMDT_RSP_ACK);
f0690a25 1113 } else if (rlen == 0) {
e9576fe8 1114 response[0] = p[0] | VDO_CMDT(CMDT_RSP_NAK);
f0690a25
GR		 1115 rlen = 1;
1116 } else {
e9576fe8 1117 response[0] = p[0] | VDO_CMDT(CMDT_RSP_BUSY);
f0690a25
GR		 1118 rlen = 1;
1119 }
1120 break;
1121 case CMDT_RSP_ACK:
1122 /* silently drop message if we are not connected */
cf6e06cd 1123 if (IS_ERR_OR_NULL(port->partner))
f0690a25
GR		 1124 break;
1125
1126 switch (cmd) {
1127 case CMD_DISCOVER_IDENT:
1128 /* 6.4.4.3.1 */
1129 svdm_consume_identity(port, payload, cnt);
1130 response[0] = VDO(USB_SID_PD, 1, CMD_DISCOVER_SVID);
1131 rlen = 1;
1132 break;
1133 case CMD_DISCOVER_SVID:
1134 /* 6.4.4.3.2 */
1135 if (svdm_consume_svids(port, payload, cnt)) {
1136 response[0] = VDO(USB_SID_PD, 1,
1137 CMD_DISCOVER_SVID);
1138 rlen = 1;
1139 } else if (modep->nsvids && supports_modal(port)) {
1140 response[0] = VDO(modep->svids[0], 1,
1141 CMD_DISCOVER_MODES);
1142 rlen = 1;
1143 }
1144 break;
1145 case CMD_DISCOVER_MODES:
1146 /* 6.4.4.3.3 */
1147 svdm_consume_modes(port, payload, cnt);
1148 modep->svid_index++;
1149 if (modep->svid_index < modep->nsvids) {
e9576fe8 1150 u16 svid = modep->svids[modep->svid_index];
f0690a25
GR		 1151 response[0] = VDO(svid, 1, CMD_DISCOVER_MODES);
1152 rlen = 1;
1153 } else {
e9576fe8 1154 tcpm_register_partner_altmodes(port);
f0690a25
GR		 1155 }
1156 break;
1157 case CMD_ENTER_MODE:
88d02c9b
GR		 1158 if (adev && pdev) {
1159 typec_altmode_update_active(pdev, true);
1160
1161 if (typec_altmode_vdm(adev, p[0], &p[1], cnt)) {
1162 response[0] = VDO(adev->svid, 1,
1163 CMD_EXIT_MODE);
1164 response[0] |= VDO_OPOS(adev->mode);
1165 return 1;
1166 }
e9576fe8
HK		 1167 }
1168 return 0;
1169 case CMD_EXIT_MODE:
88d02c9b
GR		 1170 if (adev && pdev) {
1171 typec_altmode_update_active(pdev, false);
e9576fe8 1172
88d02c9b
GR		 1173 /* Back to USB Operation */
1174 WARN_ON(typec_altmode_notify(adev,
1175 TYPEC_STATE_USB,
1176 NULL));
1177 }
e9576fe8
HK		 1178 break;
1179 default:
1180 break;
1181 }
1182 break;
1183 case CMDT_RSP_NAK:
1184 switch (cmd) {
1185 case CMD_ENTER_MODE:
1186 /* Back to USB Operation */
88d02c9b
GR		 1187 if (adev)
1188 WARN_ON(typec_altmode_notify(adev,
1189 TYPEC_STATE_USB,
1190 NULL));
f0690a25
GR		 1191 break;
1192 default:
1193 break;
1194 }
1195 break;
1196 default:
1197 break;
1198 }
1199
e9576fe8 1200 /* Informing the alternate mode drivers about everything */
88d02c9b
GR		 1201 if (adev)
1202 typec_altmode_vdm(adev, p[0], &p[1], cnt);
e9576fe8 1203
f0690a25
GR		 1204 return rlen;
1205}
1206
1207static void tcpm_handle_vdm_request(struct tcpm_port *port,
1208 const __le32 *payload, int cnt)
1209{
1210 int rlen = 0;
1211 u32 response[8] = { };
1212 u32 p0 = le32_to_cpu(payload[0]);
1213
1214 if (port->vdm_state == VDM_STATE_BUSY) {
1215 /* If UFP responded busy retry after timeout */
1216 if (PD_VDO_CMDT(p0) == CMDT_RSP_BUSY) {
1217 port->vdm_state = VDM_STATE_WAIT_RSP_BUSY;
1218 port->vdo_retry = (p0 & ~VDO_CMDT_MASK) |
1219 CMDT_INIT;
1220 mod_delayed_work(port->wq, &port->vdm_state_machine,
1221 msecs_to_jiffies(PD_T_VDM_BUSY));
1222 return;
1223 }
1224 port->vdm_state = VDM_STATE_DONE;
1225 }
1226
1227 if (PD_VDO_SVDM(p0))
1228 rlen = tcpm_pd_svdm(port, payload, cnt, response);
f0690a25
GR		 1229
1230 if (rlen > 0) {
1231 tcpm_queue_vdm(port, response[0], &response[1], rlen - 1);
1232 mod_delayed_work(port->wq, &port->vdm_state_machine, 0);
1233 }
1234}
1235
1236static void tcpm_send_vdm(struct tcpm_port *port, u32 vid, int cmd,
1237 const u32 *data, int count)
1238{
1239 u32 header;
1240
1241 if (WARN_ON(count > VDO_MAX_SIZE - 1))
1242 count = VDO_MAX_SIZE - 1;
1243
1244 /* set VDM header with VID & CMD */
1245 header = VDO(vid, ((vid & USB_SID_PD) == USB_SID_PD) ?
1246 1 : (PD_VDO_CMD(cmd) <= CMD_ATTENTION), cmd);
1247 tcpm_queue_vdm(port, header, data, count);
1248
1249 mod_delayed_work(port->wq, &port->vdm_state_machine, 0);
1250}
1251
1252static unsigned int vdm_ready_timeout(u32 vdm_hdr)
1253{
1254 unsigned int timeout;
1255 int cmd = PD_VDO_CMD(vdm_hdr);
1256
1257 /* its not a structured VDM command */
1258 if (!PD_VDO_SVDM(vdm_hdr))
1259 return PD_T_VDM_UNSTRUCTURED;
1260
1261 switch (PD_VDO_CMDT(vdm_hdr)) {
1262 case CMDT_INIT:
1263 if (cmd == CMD_ENTER_MODE || cmd == CMD_EXIT_MODE)
1264 timeout = PD_T_VDM_WAIT_MODE_E;
1265 else
1266 timeout = PD_T_VDM_SNDR_RSP;
1267 break;
1268 default:
1269 if (cmd == CMD_ENTER_MODE || cmd == CMD_EXIT_MODE)
1270 timeout = PD_T_VDM_E_MODE;
1271 else
1272 timeout = PD_T_VDM_RCVR_RSP;
1273 break;
1274 }
1275 return timeout;
1276}
1277
1278static void vdm_run_state_machine(struct tcpm_port *port)
1279{
1280 struct pd_message msg;
1281 int i, res;
1282
1283 switch (port->vdm_state) {
1284 case VDM_STATE_READY:
1285 /* Only transmit VDM if attached */
1286 if (!port->attached) {
1287 port->vdm_state = VDM_STATE_ERR_BUSY;
1288 break;
1289 }
1290
1291 /*
1292 * if there's traffic or we're not in PDO ready state don't send
1293 * a VDM.
1294 */
1295 if (port->state != SRC_READY && port->state != SNK_READY)
1296 break;
1297
1298 /* Prepare and send VDM */
1299 memset(&msg, 0, sizeof(msg));
1300 msg.header = PD_HEADER_LE(PD_DATA_VENDOR_DEF,
1301 port->pwr_role,
1302 port->data_role,
2eadc33f 1303 port->negotiated_rev,
f0690a25
GR		 1304 port->message_id, port->vdo_count);
1305 for (i = 0; i < port->vdo_count; i++)
1306 msg.payload[i] = cpu_to_le32(port->vdo_data[i]);
1307 res = tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
1308 if (res < 0) {
1309 port->vdm_state = VDM_STATE_ERR_SEND;
1310 } else {
1311 unsigned long timeout;
1312
1313 port->vdm_retries = 0;
1314 port->vdm_state = VDM_STATE_BUSY;
1315 timeout = vdm_ready_timeout(port->vdo_data[0]);
1316 mod_delayed_work(port->wq, &port->vdm_state_machine,
1317 timeout);
1318 }
1319 break;
1320 case VDM_STATE_WAIT_RSP_BUSY:
1321 port->vdo_data[0] = port->vdo_retry;
1322 port->vdo_count = 1;
1323 port->vdm_state = VDM_STATE_READY;
1324 break;
1325 case VDM_STATE_BUSY:
1326 port->vdm_state = VDM_STATE_ERR_TMOUT;
1327 break;
1328 case VDM_STATE_ERR_SEND:
1329 /*
1330 * A partner which does not support USB PD will not reply,
1331 * so this is not a fatal error. At the same time, some
1332 * devices may not return GoodCRC under some circumstances,
1333 * so we need to retry.
1334 */
1335 if (port->vdm_retries < 3) {
1336 tcpm_log(port, "VDM Tx error, retry");
1337 port->vdm_retries++;
1338 port->vdm_state = VDM_STATE_READY;
1339 }
1340 break;
1341 default:
1342 break;
1343 }
1344}
1345
1346static void vdm_state_machine_work(struct work_struct *work)
1347{
1348 struct tcpm_port *port = container_of(work, struct tcpm_port,
1349 vdm_state_machine.work);
1350 enum vdm_states prev_state;
1351
1352 mutex_lock(&port->lock);
1353
1354 /*
1355 * Continue running as long as the port is not busy and there was
1356 * a state change.
1357 */
1358 do {
1359 prev_state = port->vdm_state;
1360 vdm_run_state_machine(port);
1361 } while (port->vdm_state != prev_state &&
1362 port->vdm_state != VDM_STATE_BUSY);
1363
1364 mutex_unlock(&port->lock);
1365}
1366
5007e1b5
BJS		 1367enum pdo_err {
1368 PDO_NO_ERR,
1369 PDO_ERR_NO_VSAFE5V,
1370 PDO_ERR_VSAFE5V_NOT_FIRST,
1371 PDO_ERR_PDO_TYPE_NOT_IN_ORDER,
1372 PDO_ERR_FIXED_NOT_SORTED,
1373 PDO_ERR_VARIABLE_BATT_NOT_SORTED,
1374 PDO_ERR_DUPE_PDO,
2eadc33f
AT		 1375 PDO_ERR_PPS_APDO_NOT_SORTED,
1376 PDO_ERR_DUPE_PPS_APDO,
5007e1b5
BJS		 1377};
1378
1379static const char * const pdo_err_msg[] = {
1380 [PDO_ERR_NO_VSAFE5V] =
1381 " err: source/sink caps should atleast have vSafe5V",
1382 [PDO_ERR_VSAFE5V_NOT_FIRST] =
1383 " err: vSafe5V Fixed Supply Object Shall always be the first object",
1384 [PDO_ERR_PDO_TYPE_NOT_IN_ORDER] =
1385 " err: PDOs should be in the following order: Fixed; Battery; Variable",
1386 [PDO_ERR_FIXED_NOT_SORTED] =
1387 " err: Fixed supply pdos should be in increasing order of their fixed voltage",
1388 [PDO_ERR_VARIABLE_BATT_NOT_SORTED] =
1389 " err: Variable/Battery supply pdos should be in increasing order of their minimum voltage",
1390 [PDO_ERR_DUPE_PDO] =
1391 " err: Variable/Batt supply pdos cannot have same min/max voltage",
2eadc33f
AT		 1392 [PDO_ERR_PPS_APDO_NOT_SORTED] =
1393 " err: Programmable power supply apdos should be in increasing order of their maximum voltage",
1394 [PDO_ERR_DUPE_PPS_APDO] =
1395 " err: Programmable power supply apdos cannot have same min/max voltage and max current",
5007e1b5
BJS		 1396};
1397
1398static enum pdo_err tcpm_caps_err(struct tcpm_port *port, const u32 *pdo,
1399 unsigned int nr_pdo)
1400{
1401 unsigned int i;
1402
1403 /* Should at least contain vSafe5v */
1404 if (nr_pdo < 1)
1405 return PDO_ERR_NO_VSAFE5V;
1406
1407 /* The vSafe5V Fixed Supply Object Shall always be the first object */
1408 if (pdo_type(pdo[0]) != PDO_TYPE_FIXED ||
1409 pdo_fixed_voltage(pdo[0]) != VSAFE5V)
1410 return PDO_ERR_VSAFE5V_NOT_FIRST;
1411
1412 for (i = 1; i < nr_pdo; i++) {
1413 if (pdo_type(pdo[i]) < pdo_type(pdo[i - 1])) {
1414 return PDO_ERR_PDO_TYPE_NOT_IN_ORDER;
1415 } else if (pdo_type(pdo[i]) == pdo_type(pdo[i - 1])) {
1416 enum pd_pdo_type type = pdo_type(pdo[i]);
1417
1418 switch (type) {
1419 /*
1420 * The remaining Fixed Supply Objects, if
1421 * present, shall be sent in voltage order;
1422 * lowest to highest.
1423 */
1424 case PDO_TYPE_FIXED:
1425 if (pdo_fixed_voltage(pdo[i]) <=
1426 pdo_fixed_voltage(pdo[i - 1]))
1427 return PDO_ERR_FIXED_NOT_SORTED;
1428 break;
1429 /*
1430 * The Battery Supply Objects and Variable
1431 * supply, if present shall be sent in Minimum
1432 * Voltage order; lowest to highest.
1433 */
1434 case PDO_TYPE_VAR:
1435 case PDO_TYPE_BATT:
1436 if (pdo_min_voltage(pdo[i]) <
1437 pdo_min_voltage(pdo[i - 1]))
1438 return PDO_ERR_VARIABLE_BATT_NOT_SORTED;
1439 else if ((pdo_min_voltage(pdo[i]) ==
1440 pdo_min_voltage(pdo[i - 1])) &&
1441 (pdo_max_voltage(pdo[i]) ==
a684d8fd 1442 pdo_max_voltage(pdo[i - 1])))
5007e1b5
BJS		 1443 return PDO_ERR_DUPE_PDO;
1444 break;
2eadc33f
AT		 1445 /*
1446 * The Programmable Power Supply APDOs, if present,
1447 * shall be sent in Maximum Voltage order;
1448 * lowest to highest.
1449 */
1450 case PDO_TYPE_APDO:
1451 if (pdo_apdo_type(pdo[i]) != APDO_TYPE_PPS)
1452 break;
1453
1b6af2f5
AT		 1454 if (pdo_pps_apdo_max_voltage(pdo[i]) <
1455 pdo_pps_apdo_max_voltage(pdo[i - 1]))
2eadc33f
AT		 1456 return PDO_ERR_PPS_APDO_NOT_SORTED;
1457 else if (pdo_pps_apdo_min_voltage(pdo[i]) ==
1458 pdo_pps_apdo_min_voltage(pdo[i - 1]) &&
1459 pdo_pps_apdo_max_voltage(pdo[i]) ==
1460 pdo_pps_apdo_max_voltage(pdo[i - 1]) &&
1461 pdo_pps_apdo_max_current(pdo[i]) ==
1462 pdo_pps_apdo_max_current(pdo[i - 1]))
1463 return PDO_ERR_DUPE_PPS_APDO;
1464 break;
5007e1b5
BJS		 1465 default:
1466 tcpm_log_force(port, " Unknown pdo type");
1467 }
1468 }
1469 }
1470
1471 return PDO_NO_ERR;
1472}
1473
1474static int tcpm_validate_caps(struct tcpm_port *port, const u32 *pdo,
1475 unsigned int nr_pdo)
1476{
1477 enum pdo_err err_index = tcpm_caps_err(port, pdo, nr_pdo);
1478
1479 if (err_index != PDO_NO_ERR) {
1480 tcpm_log_force(port, " %s", pdo_err_msg[err_index]);
1481 return -EINVAL;
1482 }
1483
1484 return 0;
1485}
1486
e9576fe8
HK		 1487static int tcpm_altmode_enter(struct typec_altmode *altmode)
1488{
1489 struct tcpm_port *port = typec_altmode_get_drvdata(altmode);
1490 u32 header;
1491
1492 mutex_lock(&port->lock);
1493 header = VDO(altmode->svid, 1, CMD_ENTER_MODE);
1494 header |= VDO_OPOS(altmode->mode);
1495
1496 tcpm_queue_vdm(port, header, NULL, 0);
1497 mod_delayed_work(port->wq, &port->vdm_state_machine, 0);
1498 mutex_unlock(&port->lock);
1499
1500 return 0;
1501}
1502
1503static int tcpm_altmode_exit(struct typec_altmode *altmode)
1504{
1505 struct tcpm_port *port = typec_altmode_get_drvdata(altmode);
1506 u32 header;
1507
1508 mutex_lock(&port->lock);
1509 header = VDO(altmode->svid, 1, CMD_EXIT_MODE);
1510 header |= VDO_OPOS(altmode->mode);
1511
1512 tcpm_queue_vdm(port, header, NULL, 0);
1513 mod_delayed_work(port->wq, &port->vdm_state_machine, 0);
1514 mutex_unlock(&port->lock);
1515
1516 return 0;
1517}
1518
1519static int tcpm_altmode_vdm(struct typec_altmode *altmode,
1520 u32 header, const u32 *data, int count)
1521{
1522 struct tcpm_port *port = typec_altmode_get_drvdata(altmode);
1523
1524 mutex_lock(&port->lock);
1525 tcpm_queue_vdm(port, header, data, count - 1);
1526 mod_delayed_work(port->wq, &port->vdm_state_machine, 0);
1527 mutex_unlock(&port->lock);
1528
1529 return 0;
1530}
1531
1532static const struct typec_altmode_ops tcpm_altmode_ops = {
1533 .enter = tcpm_altmode_enter,
1534 .exit = tcpm_altmode_exit,
1535 .vdm = tcpm_altmode_vdm,
1536};
1537
f0690a25
GR		 1538/*
1539 * PD (data, control) command handling functions
1540 */
64f7c494
AT		 1541static inline enum tcpm_state ready_state(struct tcpm_port *port)
1542{
1543 if (port->pwr_role == TYPEC_SOURCE)
1544 return SRC_READY;
1545 else
1546 return SNK_READY;
1547}
2eadc33f
AT		 1548
1549static int tcpm_pd_send_control(struct tcpm_port *port,
1550 enum pd_ctrl_msg_type type);
1551
64f7c494
AT		 1552static void tcpm_handle_alert(struct tcpm_port *port, const __le32 *payload,
1553 int cnt)
1554{
1555 u32 p0 = le32_to_cpu(payload[0]);
1556 unsigned int type = usb_pd_ado_type(p0);
1557
1558 if (!type) {
1559 tcpm_log(port, "Alert message received with no type");
1560 return;
1561 }
1562
1563 /* Just handling non-battery alerts for now */
1564 if (!(type & USB_PD_ADO_TYPE_BATT_STATUS_CHANGE)) {
1565 switch (port->state) {
1566 case SRC_READY:
1567 case SNK_READY:
1568 tcpm_set_state(port, GET_STATUS_SEND, 0);
1569 break;
1570 default:
1571 tcpm_queue_message(port, PD_MSG_CTRL_WAIT);
1572 break;
1573 }
1574 }
1575}
1576
f0690a25
GR		 1577static void tcpm_pd_data_request(struct tcpm_port *port,
1578 const struct pd_message *msg)
1579{
1580 enum pd_data_msg_type type = pd_header_type_le(msg->header);
1581 unsigned int cnt = pd_header_cnt_le(msg->header);
2eadc33f 1582 unsigned int rev = pd_header_rev_le(msg->header);
f0690a25
GR		 1583 unsigned int i;
1584
1585 switch (type) {
1586 case PD_DATA_SOURCE_CAP:
1587 if (port->pwr_role != TYPEC_SINK)
1588 break;
1589
1590 for (i = 0; i < cnt; i++)
1591 port->source_caps[i] = le32_to_cpu(msg->payload[i]);
1592
1593 port->nr_source_caps = cnt;
1594
1595 tcpm_log_source_caps(port);
1596
5007e1b5
BJS		 1597 tcpm_validate_caps(port, port->source_caps,
1598 port->nr_source_caps);
1599
2eadc33f
AT		 1600 /*
1601 * Adjust revision in subsequent message headers, as required,
1602 * to comply with 6.2.1.1.5 of the USB PD 3.0 spec. We don't
1603 * support Rev 1.0 so just do nothing in that scenario.
1604 */
1605 if (rev == PD_REV10)
1606 break;
1607
1608 if (rev < PD_MAX_REV)
1609 port->negotiated_rev = rev;
1610
f0690a25
GR		 1611 /*
1612 * This message may be received even if VBUS is not
1613 * present. This is quite unexpected; see USB PD
1614 * specification, sections 8.3.3.6.3.1 and 8.3.3.6.3.2.
1615 * However, at the same time, we must be ready to
1616 * receive this message and respond to it 15ms after
1617 * receiving PS_RDY during power swap operations, no matter
1618 * if VBUS is available or not (USB PD specification,
1619 * section 6.5.9.2).
1620 * So we need to accept the message either way,
1621 * but be prepared to keep waiting for VBUS after it was
1622 * handled.
1623 */
1624 tcpm_set_state(port, SNK_NEGOTIATE_CAPABILITIES, 0);
1625 break;
1626 case PD_DATA_REQUEST:
1627 if (port->pwr_role != TYPEC_SOURCE ||
1628 cnt != 1) {
1629 tcpm_queue_message(port, PD_MSG_CTRL_REJECT);
1630 break;
1631 }
2eadc33f
AT		 1632
1633 /*
1634 * Adjust revision in subsequent message headers, as required,
1635 * to comply with 6.2.1.1.5 of the USB PD 3.0 spec. We don't
1636 * support Rev 1.0 so just reject in that scenario.
1637 */
1638 if (rev == PD_REV10) {
1639 tcpm_queue_message(port, PD_MSG_CTRL_REJECT);
1640 break;
1641 }
1642
1643 if (rev < PD_MAX_REV)
1644 port->negotiated_rev = rev;
1645
f0690a25
GR		 1646 port->sink_request = le32_to_cpu(msg->payload[0]);
1647 tcpm_set_state(port, SRC_NEGOTIATE_CAPABILITIES, 0);
1648 break;
1649 case PD_DATA_SINK_CAP:
1650 /* We don't do anything with this at the moment... */
1651 for (i = 0; i < cnt; i++)
1652 port->sink_caps[i] = le32_to_cpu(msg->payload[i]);
1653 port->nr_sink_caps = cnt;
1654 break;
1655 case PD_DATA_VENDOR_DEF:
1656 tcpm_handle_vdm_request(port, msg->payload, cnt);
1657 break;
1658 case PD_DATA_BIST:
1659 if (port->state == SRC_READY || port->state == SNK_READY) {
1660 port->bist_request = le32_to_cpu(msg->payload[0]);
1661 tcpm_set_state(port, BIST_RX, 0);
1662 }
1663 break;
64f7c494
AT		 1664 case PD_DATA_ALERT:
1665 tcpm_handle_alert(port, msg->payload, cnt);
1666 break;
1667 case PD_DATA_BATT_STATUS:
1668 case PD_DATA_GET_COUNTRY_INFO:
1669 /* Currently unsupported */
1670 tcpm_queue_message(port, PD_MSG_CTRL_NOT_SUPP);
1671 break;
f0690a25
GR		 1672 default:
1673 tcpm_log(port, "Unhandled data message type %#x", type);
1674 break;
1675 }
1676}
1677
2eadc33f
AT		 1678static void tcpm_pps_complete(struct tcpm_port *port, int result)
1679{
1680 if (port->pps_pending) {
1681 port->pps_status = result;
1682 port->pps_pending = false;
1683 complete(&port->pps_complete);
1684 }
1685}
1686
f0690a25
GR		 1687static void tcpm_pd_ctrl_request(struct tcpm_port *port,
1688 const struct pd_message *msg)
1689{
1690 enum pd_ctrl_msg_type type = pd_header_type_le(msg->header);
1691 enum tcpm_state next_state;
1692
1693 switch (type) {
1694 case PD_CTRL_GOOD_CRC:
1695 case PD_CTRL_PING:
1696 break;
1697 case PD_CTRL_GET_SOURCE_CAP:
1698 switch (port->state) {
1699 case SRC_READY:
1700 case SNK_READY:
1701 tcpm_queue_message(port, PD_MSG_DATA_SOURCE_CAP);
1702 break;
1703 default:
1704 tcpm_queue_message(port, PD_MSG_CTRL_REJECT);
1705 break;
1706 }
1707 break;
1708 case PD_CTRL_GET_SINK_CAP:
1709 switch (port->state) {
1710 case SRC_READY:
1711 case SNK_READY:
1712 tcpm_queue_message(port, PD_MSG_DATA_SINK_CAP);
1713 break;
1714 default:
1715 tcpm_queue_message(port, PD_MSG_CTRL_REJECT);
1716 break;
1717 }
1718 break;
1719 case PD_CTRL_GOTO_MIN:
1720 break;
1721 case PD_CTRL_PS_RDY:
1722 switch (port->state) {
1723 case SNK_TRANSITION_SINK:
1724 if (port->vbus_present) {
1725 tcpm_set_current_limit(port,
1726 port->current_limit,
1727 port->supply_voltage);
8bf05746 1728 port->explicit_contract = true;
f0690a25
GR		 1729 tcpm_set_state(port, SNK_READY, 0);
1730 } else {
1731 /*
1732 * Seen after power swap. Keep waiting for VBUS
1733 * in a transitional state.
1734 */
1735 tcpm_set_state(port,
1736 SNK_TRANSITION_SINK_VBUS, 0);
1737 }
1738 break;
b965b631 1739 case PR_SWAP_SRC_SNK_SOURCE_OFF_CC_DEBOUNCED:
f0690a25
GR		 1740 tcpm_set_state(port, PR_SWAP_SRC_SNK_SINK_ON, 0);
1741 break;
1742 case PR_SWAP_SNK_SRC_SINK_OFF:
1743 tcpm_set_state(port, PR_SWAP_SNK_SRC_SOURCE_ON, 0);
1744 break;
1745 case VCONN_SWAP_WAIT_FOR_VCONN:
1746 tcpm_set_state(port, VCONN_SWAP_TURN_OFF_VCONN, 0);
1747 break;
1748 default:
1749 break;
1750 }
1751 break;
1752 case PD_CTRL_REJECT:
1753 case PD_CTRL_WAIT:
64f7c494 1754 case PD_CTRL_NOT_SUPP:
f0690a25
GR		 1755 switch (port->state) {
1756 case SNK_NEGOTIATE_CAPABILITIES:
1757 /* USB PD specification, Figure 8-43 */
1758 if (port->explicit_contract)
1759 next_state = SNK_READY;
1760 else
1761 next_state = SNK_WAIT_CAPABILITIES;
1762 tcpm_set_state(port, next_state, 0);
1763 break;
2eadc33f
AT		 1764 case SNK_NEGOTIATE_PPS_CAPABILITIES:
1765 /* Revert data back from any requested PPS updates */
1766 port->pps_data.out_volt = port->supply_voltage;
1767 port->pps_data.op_curr = port->current_limit;
1768 port->pps_status = (type == PD_CTRL_WAIT ?
1769 -EAGAIN : -EOPNOTSUPP);
1770 tcpm_set_state(port, SNK_READY, 0);
1771 break;
f0690a25
GR		 1772 case DR_SWAP_SEND:
1773 port->swap_status = (type == PD_CTRL_WAIT ?
1774 -EAGAIN : -EOPNOTSUPP);
1775 tcpm_set_state(port, DR_SWAP_CANCEL, 0);
1776 break;
1777 case PR_SWAP_SEND:
1778 port->swap_status = (type == PD_CTRL_WAIT ?
1779 -EAGAIN : -EOPNOTSUPP);
1780 tcpm_set_state(port, PR_SWAP_CANCEL, 0);
1781 break;
1782 case VCONN_SWAP_SEND:
1783 port->swap_status = (type == PD_CTRL_WAIT ?
1784 -EAGAIN : -EOPNOTSUPP);
1785 tcpm_set_state(port, VCONN_SWAP_CANCEL, 0);
1786 break;
1787 default:
1788 break;
1789 }
1790 break;
1791 case PD_CTRL_ACCEPT:
1792 switch (port->state) {
1793 case SNK_NEGOTIATE_CAPABILITIES:
2eadc33f
AT		 1794 port->pps_data.active = false;
1795 tcpm_set_state(port, SNK_TRANSITION_SINK, 0);
1796 break;
1797 case SNK_NEGOTIATE_PPS_CAPABILITIES:
1798 port->pps_data.active = true;
1799 port->supply_voltage = port->pps_data.out_volt;
1800 port->current_limit = port->pps_data.op_curr;
f0690a25
GR		 1801 tcpm_set_state(port, SNK_TRANSITION_SINK, 0);
1802 break;
1803 case SOFT_RESET_SEND:
1804 port->message_id = 0;
5fec4b54 1805 port->rx_msgid = -1;
f0690a25
GR		 1806 if (port->pwr_role == TYPEC_SOURCE)
1807 next_state = SRC_SEND_CAPABILITIES;
1808 else
1809 next_state = SNK_WAIT_CAPABILITIES;
1810 tcpm_set_state(port, next_state, 0);
1811 break;
1812 case DR_SWAP_SEND:
1813 tcpm_set_state(port, DR_SWAP_CHANGE_DR, 0);
1814 break;
1815 case PR_SWAP_SEND:
1816 tcpm_set_state(port, PR_SWAP_START, 0);
1817 break;
1818 case VCONN_SWAP_SEND:
1819 tcpm_set_state(port, VCONN_SWAP_START, 0);
1820 break;
1821 default:
1822 break;
1823 }
1824 break;
1825 case PD_CTRL_SOFT_RESET:
1826 tcpm_set_state(port, SOFT_RESET, 0);
1827 break;
1828 case PD_CTRL_DR_SWAP:
9b0ae699 1829 if (port->port_type != TYPEC_PORT_DRP) {
f0690a25
GR		 1830 tcpm_queue_message(port, PD_MSG_CTRL_REJECT);
1831 break;
1832 }
1833 /*
1834 * XXX
1835 * 6.3.9: If an alternate mode is active, a request to swap
1836 * alternate modes shall trigger a port reset.
1837 */
1838 switch (port->state) {
1839 case SRC_READY:
1840 case SNK_READY:
1841 tcpm_set_state(port, DR_SWAP_ACCEPT, 0);
1842 break;
1843 default:
1844 tcpm_queue_message(port, PD_MSG_CTRL_WAIT);
1845 break;
1846 }
1847 break;
1848 case PD_CTRL_PR_SWAP:
9b0ae699 1849 if (port->port_type != TYPEC_PORT_DRP) {
f0690a25
GR		 1850 tcpm_queue_message(port, PD_MSG_CTRL_REJECT);
1851 break;
1852 }
1853 switch (port->state) {
1854 case SRC_READY:
1855 case SNK_READY:
1856 tcpm_set_state(port, PR_SWAP_ACCEPT, 0);
1857 break;
1858 default:
1859 tcpm_queue_message(port, PD_MSG_CTRL_WAIT);
1860 break;
1861 }
1862 break;
1863 case PD_CTRL_VCONN_SWAP:
1864 switch (port->state) {
1865 case SRC_READY:
1866 case SNK_READY:
1867 tcpm_set_state(port, VCONN_SWAP_ACCEPT, 0);
1868 break;
1869 default:
1870 tcpm_queue_message(port, PD_MSG_CTRL_WAIT);
1871 break;
1872 }
1873 break;
64f7c494
AT		 1874 case PD_CTRL_GET_SOURCE_CAP_EXT:
1875 case PD_CTRL_GET_STATUS:
1876 case PD_CTRL_FR_SWAP:
1877 case PD_CTRL_GET_PPS_STATUS:
1878 case PD_CTRL_GET_COUNTRY_CODES:
1879 /* Currently not supported */
1880 tcpm_queue_message(port, PD_MSG_CTRL_NOT_SUPP);
1881 break;
f0690a25
GR		 1882 default:
1883 tcpm_log(port, "Unhandled ctrl message type %#x", type);
1884 break;
1885 }
1886}
1887
64f7c494
AT		 1888static void tcpm_pd_ext_msg_request(struct tcpm_port *port,
1889 const struct pd_message *msg)
1890{
1891 enum pd_ext_msg_type type = pd_header_type_le(msg->header);
1892 unsigned int data_size = pd_ext_header_data_size_le(msg->ext_msg.header);
1893
25242703 1894 if (!(msg->ext_msg.header & PD_EXT_HDR_CHUNKED)) {
64f7c494
AT		 1895 tcpm_log(port, "Unchunked extended messages unsupported");
1896 return;
1897 }
1898
1899 if (data_size > PD_EXT_MAX_CHUNK_DATA) {
1900 tcpm_log(port, "Chunk handling not yet supported");
1901 return;
1902 }
1903
1904 switch (type) {
1905 case PD_EXT_STATUS:
1906 /*
1907 * If PPS related events raised then get PPS status to clear
1908 * (see USB PD 3.0 Spec, 6.5.2.4)
1909 */
1910 if (msg->ext_msg.data[USB_PD_EXT_SDB_EVENT_FLAGS] &
1911 USB_PD_EXT_SDB_PPS_EVENTS)
1912 tcpm_set_state(port, GET_PPS_STATUS_SEND, 0);
1913 else
1914 tcpm_set_state(port, ready_state(port), 0);
1915 break;
1916 case PD_EXT_PPS_STATUS:
1917 /*
1918 * For now the PPS status message is used to clear events
1919 * and nothing more.
1920 */
1921 tcpm_set_state(port, ready_state(port), 0);
1922 break;
1923 case PD_EXT_SOURCE_CAP_EXT:
1924 case PD_EXT_GET_BATT_CAP:
1925 case PD_EXT_GET_BATT_STATUS:
1926 case PD_EXT_BATT_CAP:
1927 case PD_EXT_GET_MANUFACTURER_INFO:
1928 case PD_EXT_MANUFACTURER_INFO:
1929 case PD_EXT_SECURITY_REQUEST:
1930 case PD_EXT_SECURITY_RESPONSE:
1931 case PD_EXT_FW_UPDATE_REQUEST:
1932 case PD_EXT_FW_UPDATE_RESPONSE:
1933 case PD_EXT_COUNTRY_INFO:
1934 case PD_EXT_COUNTRY_CODES:
1935 tcpm_queue_message(port, PD_MSG_CTRL_NOT_SUPP);
1936 break;
1937 default:
1938 tcpm_log(port, "Unhandled extended message type %#x", type);
1939 break;
1940 }
1941}
1942
f0690a25
GR		 1943static void tcpm_pd_rx_handler(struct work_struct *work)
1944{
1945 struct pd_rx_event *event = container_of(work,
1946 struct pd_rx_event, work);
1947 const struct pd_message *msg = &event->msg;
1948 unsigned int cnt = pd_header_cnt_le(msg->header);
1949 struct tcpm_port *port = event->port;
1950
1951 mutex_lock(&port->lock);
1952
1953 tcpm_log(port, "PD RX, header: %#x [%d]", le16_to_cpu(msg->header),
1954 port->attached);
1955
1956 if (port->attached) {
5fec4b54
GR		 1957 enum pd_ctrl_msg_type type = pd_header_type_le(msg->header);
1958 unsigned int msgid = pd_header_msgid_le(msg->header);
1959
1960 /*
1961 * USB PD standard, 6.6.1.2:
1962 * "... if MessageID value in a received Message is the
1963 * same as the stored value, the receiver shall return a
1964 * GoodCRC Message with that MessageID value and drop
1965 * the Message (this is a retry of an already received
1966 * Message). Note: this shall not apply to the Soft_Reset
1967 * Message which always has a MessageID value of zero."
1968 */
1969 if (msgid == port->rx_msgid && type != PD_CTRL_SOFT_RESET)
1970 goto done;
1971 port->rx_msgid = msgid;
1972
f0690a25
GR		 1973 /*
1974 * If both ends believe to be DFP/host, we have a data role
1975 * mismatch.
1976 */
1977 if (!!(le16_to_cpu(msg->header) & PD_HEADER_DATA_ROLE) ==
1978 (port->data_role == TYPEC_HOST)) {
1979 tcpm_log(port,
1980 "Data role mismatch, initiating error recovery");
1981 tcpm_set_state(port, ERROR_RECOVERY, 0);
1982 } else {
64f7c494
AT		 1983 if (msg->header & PD_HEADER_EXT_HDR)
1984 tcpm_pd_ext_msg_request(port, msg);
1985 else if (cnt)
f0690a25
GR		 1986 tcpm_pd_data_request(port, msg);
1987 else
1988 tcpm_pd_ctrl_request(port, msg);
1989 }
1990 }
1991
5fec4b54 1992done:
f0690a25
GR		 1993 mutex_unlock(&port->lock);
1994 kfree(event);
1995}
1996
1997void tcpm_pd_receive(struct tcpm_port *port, const struct pd_message *msg)
1998{
1999 struct pd_rx_event *event;
2000
2001 event = kzalloc(sizeof(*event), GFP_ATOMIC);
2002 if (!event)
2003 return;
2004
2005 INIT_WORK(&event->work, tcpm_pd_rx_handler);
2006 event->port = port;
2007 memcpy(&event->msg, msg, sizeof(*msg));
2008 queue_work(port->wq, &event->work);
2009}
2010EXPORT_SYMBOL_GPL(tcpm_pd_receive);
2011
2012static int tcpm_pd_send_control(struct tcpm_port *port,
2013 enum pd_ctrl_msg_type type)
2014{
2015 struct pd_message msg;
2016
2017 memset(&msg, 0, sizeof(msg));
2018 msg.header = PD_HEADER_LE(type, port->pwr_role,
2019 port->data_role,
2eadc33f 2020 port->negotiated_rev,
f0690a25
GR		 2021 port->message_id, 0);
2022
2023 return tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
2024}
2025
2026/*
2027 * Send queued message without affecting state.
2028 * Return true if state machine should go back to sleep,
2029 * false otherwise.
2030 */
2031static bool tcpm_send_queued_message(struct tcpm_port *port)
2032{
2033 enum pd_msg_request queued_message;
2034
2035 do {
2036 queued_message = port->queued_message;
2037 port->queued_message = PD_MSG_NONE;
2038
2039 switch (queued_message) {
2040 case PD_MSG_CTRL_WAIT:
2041 tcpm_pd_send_control(port, PD_CTRL_WAIT);
2042 break;
2043 case PD_MSG_CTRL_REJECT:
2044 tcpm_pd_send_control(port, PD_CTRL_REJECT);
2045 break;
64f7c494
AT		 2046 case PD_MSG_CTRL_NOT_SUPP:
2047 tcpm_pd_send_control(port, PD_CTRL_NOT_SUPP);
2048 break;
f0690a25
GR		 2049 case PD_MSG_DATA_SINK_CAP:
2050 tcpm_pd_send_sink_caps(port);
2051 break;
2052 case PD_MSG_DATA_SOURCE_CAP:
2053 tcpm_pd_send_source_caps(port);
2054 break;
2055 default:
2056 break;
2057 }
2058 } while (port->queued_message != PD_MSG_NONE);
2059
2060 if (port->delayed_state != INVALID_STATE) {
2061 if (time_is_after_jiffies(port->delayed_runtime)) {
2062 mod_delayed_work(port->wq, &port->state_machine,
2063 port->delayed_runtime - jiffies);
2064 return true;
2065 }
2066 port->delayed_state = INVALID_STATE;
2067 }
2068 return false;
2069}
2070
2071static int tcpm_pd_check_request(struct tcpm_port *port)
2072{
2073 u32 pdo, rdo = port->sink_request;
2074 unsigned int max, op, pdo_max, index;
2075 enum pd_pdo_type type;
2076
2077 index = rdo_index(rdo);
2078 if (!index || index > port->nr_src_pdo)
2079 return -EINVAL;
2080
2081 pdo = port->src_pdo[index - 1];
2082 type = pdo_type(pdo);
2083 switch (type) {
2084 case PDO_TYPE_FIXED:
2085 case PDO_TYPE_VAR:
2086 max = rdo_max_current(rdo);
2087 op = rdo_op_current(rdo);
2088 pdo_max = pdo_max_current(pdo);
2089
2090 if (op > pdo_max)
2091 return -EINVAL;
2092 if (max > pdo_max && !(rdo & RDO_CAP_MISMATCH))
2093 return -EINVAL;
2094
2095 if (type == PDO_TYPE_FIXED)
2096 tcpm_log(port,
2097 "Requested %u mV, %u mA for %u / %u mA",
2098 pdo_fixed_voltage(pdo), pdo_max, op, max);
2099 else
2100 tcpm_log(port,
2101 "Requested %u -> %u mV, %u mA for %u / %u mA",
2102 pdo_min_voltage(pdo), pdo_max_voltage(pdo),
2103 pdo_max, op, max);
2104 break;
2105 case PDO_TYPE_BATT:
2106 max = rdo_max_power(rdo);
2107 op = rdo_op_power(rdo);
2108 pdo_max = pdo_max_power(pdo);
2109
2110 if (op > pdo_max)
2111 return -EINVAL;
2112 if (max > pdo_max && !(rdo & RDO_CAP_MISMATCH))
2113 return -EINVAL;
2114 tcpm_log(port,
2115 "Requested %u -> %u mV, %u mW for %u / %u mW",
2116 pdo_min_voltage(pdo), pdo_max_voltage(pdo),
2117 pdo_max, op, max);
2118 break;
2119 default:
2120 return -EINVAL;
2121 }
2122
2123 port->op_vsafe5v = index == 1;
2124
2125 return 0;
2126}
2127
53fe0de9
LJ		 2128#define min_power(x, y) min(pdo_max_power(x), pdo_max_power(y))
2129#define min_current(x, y) min(pdo_max_current(x), pdo_max_current(y))
2130
2131static int tcpm_pd_select_pdo(struct tcpm_port *port, int *sink_pdo,
2132 int *src_pdo)
f0690a25 2133{
53fe0de9
LJ		 2134 unsigned int i, j, max_src_mv = 0, min_src_mv = 0, max_mw = 0,
2135 max_mv = 0, src_mw = 0, src_ma = 0, max_snk_mv = 0,
2136 min_snk_mv = 0;
f0690a25
GR		 2137 int ret = -EINVAL;
2138
2eadc33f 2139 port->pps_data.supported = false;
f2a8aa05 2140 port->usb_type = POWER_SUPPLY_USB_TYPE_PD;
2eadc33f 2141
f0690a25 2142 /*
53fe0de9
LJ		 2143 * Select the source PDO providing the most power which has a
2144 * matchig sink cap.
f0690a25
GR		 2145 */
2146 for (i = 0; i < port->nr_source_caps; i++) {
2147 u32 pdo = port->source_caps[i];
2148 enum pd_pdo_type type = pdo_type(pdo);
f0690a25 2149
2eadc33f
AT		 2150 switch (type) {
2151 case PDO_TYPE_FIXED:
53fe0de9
LJ		 2152 max_src_mv = pdo_fixed_voltage(pdo);
2153 min_src_mv = max_src_mv;
2eadc33f
AT		 2154 break;
2155 case PDO_TYPE_BATT:
2156 case PDO_TYPE_VAR:
53fe0de9
LJ		 2157 max_src_mv = pdo_max_voltage(pdo);
2158 min_src_mv = pdo_min_voltage(pdo);
2eadc33f
AT		 2159 break;
2160 case PDO_TYPE_APDO:
f2a8aa05 2161 if (pdo_apdo_type(pdo) == APDO_TYPE_PPS) {
2eadc33f 2162 port->pps_data.supported = true;
f2a8aa05
AT		 2163 port->usb_type =
2164 POWER_SUPPLY_USB_TYPE_PD_PPS;
2165 }
2eadc33f
AT		 2166 continue;
2167 default:
2168 tcpm_log(port, "Invalid source PDO type, ignoring");
2169 continue;
53fe0de9 2170 }
6f566af3 2171
2eadc33f
AT		 2172 switch (type) {
2173 case PDO_TYPE_FIXED:
2174 case PDO_TYPE_VAR:
53fe0de9
LJ		 2175 src_ma = pdo_max_current(pdo);
2176 src_mw = src_ma * min_src_mv / 1000;
2eadc33f
AT		 2177 break;
2178 case PDO_TYPE_BATT:
2179 src_mw = pdo_max_power(pdo);
2180 break;
2181 case PDO_TYPE_APDO:
2182 continue;
2183 default:
2184 tcpm_log(port, "Invalid source PDO type, ignoring");
2185 continue;
6f566af3
HG		 2186 }
2187
53fe0de9
LJ		 2188 for (j = 0; j < port->nr_snk_pdo; j++) {
2189 pdo = port->snk_pdo[j];
2190
2eadc33f
AT		 2191 switch (pdo_type(pdo)) {
2192 case PDO_TYPE_FIXED:
53fe0de9 2193 max_snk_mv = pdo_fixed_voltage(pdo);
2eadc33f
AT		 2194 min_snk_mv = max_snk_mv;
2195 break;
2196 case PDO_TYPE_BATT:
2197 case PDO_TYPE_VAR:
53fe0de9 2198 max_snk_mv = pdo_max_voltage(pdo);
2eadc33f
AT		 2199 min_snk_mv = pdo_min_voltage(pdo);
2200 break;
2201 case PDO_TYPE_APDO:
2202 continue;
2203 default:
2204 tcpm_log(port, "Invalid sink PDO type, ignoring");
2205 continue;
53fe0de9
LJ		 2206 }
2207
2208 if (max_src_mv <= max_snk_mv &&
2209 min_src_mv >= min_snk_mv) {
2210 /* Prefer higher voltages if available */
2211 if ((src_mw == max_mw && min_src_mv > max_mv) ||
2212 src_mw > max_mw) {
2213 *src_pdo = i;
2214 *sink_pdo = j;
2215 max_mw = src_mw;
2216 max_mv = min_src_mv;
2217 ret = 0;
2218 }
2219 }
f0690a25
GR		 2220 }
2221 }
2222
2223 return ret;
2224}
2225
2eadc33f
AT		 2226#define min_pps_apdo_current(x, y) \
2227 min(pdo_pps_apdo_max_current(x), pdo_pps_apdo_max_current(y))
2228
2229static unsigned int tcpm_pd_select_pps_apdo(struct tcpm_port *port)
2230{
2231 unsigned int i, j, max_mw = 0, max_mv = 0;
2232 unsigned int min_src_mv, max_src_mv, src_ma, src_mw;
8e4657c6 2233 unsigned int min_snk_mv, max_snk_mv;
c710d0bb
KT		 2234 unsigned int max_op_mv;
2235 u32 pdo, src, snk;
2eadc33f
AT		 2236 unsigned int src_pdo = 0, snk_pdo = 0;
2237
2238 /*
2239 * Select the source PPS APDO providing the most power while staying
2240 * within the board's limits. We skip the first PDO as this is always
2241 * 5V 3A.
2242 */
2243 for (i = 1; i < port->nr_source_caps; ++i) {
2244 pdo = port->source_caps[i];
2245
2246 switch (pdo_type(pdo)) {
2247 case PDO_TYPE_APDO:
2248 if (pdo_apdo_type(pdo) != APDO_TYPE_PPS) {
2249 tcpm_log(port, "Not PPS APDO (source), ignoring");
2250 continue;
2251 }
2252
2253 min_src_mv = pdo_pps_apdo_min_voltage(pdo);
2254 max_src_mv = pdo_pps_apdo_max_voltage(pdo);
2255 src_ma = pdo_pps_apdo_max_current(pdo);
2256 src_mw = (src_ma * max_src_mv) / 1000;
2257
2258 /*
2259 * Now search through the sink PDOs to find a matching
2260 * PPS APDO. Again skip the first sink PDO as this will
2261 * always be 5V 3A.
2262 */
c413767e 2263 for (j = 1; j < port->nr_snk_pdo; j++) {
2eadc33f
AT		 2264 pdo = port->snk_pdo[j];
2265
2266 switch (pdo_type(pdo)) {
2267 case PDO_TYPE_APDO:
2268 if (pdo_apdo_type(pdo) != APDO_TYPE_PPS) {
2269 tcpm_log(port,
2270 "Not PPS APDO (sink), ignoring");
2271 continue;
2272 }
2273
2274 min_snk_mv =
2275 pdo_pps_apdo_min_voltage(pdo);
2276 max_snk_mv =
2277 pdo_pps_apdo_max_voltage(pdo);
2eadc33f
AT		 2278 break;
2279 default:
2280 tcpm_log(port,
2281 "Not APDO type (sink), ignoring");
2282 continue;
2283 }
2284
c710d0bb
KT		 2285 if (min_src_mv <= max_snk_mv &&
2286 max_src_mv >= min_snk_mv) {
2287 max_op_mv = min(max_src_mv, max_snk_mv);
2288 src_mw = (max_op_mv * src_ma) / 1000;
2eadc33f
AT		 2289 /* Prefer higher voltages if available */
2290 if ((src_mw == max_mw &&
c710d0bb 2291 max_op_mv > max_mv) ||
2eadc33f
AT		 2292 src_mw > max_mw) {
2293 src_pdo = i;
2294 snk_pdo = j;
2295 max_mw = src_mw;
c710d0bb 2296 max_mv = max_op_mv;
2eadc33f
AT		 2297 }
2298 }
2299 }
2300
2301 break;
2302 default:
2303 tcpm_log(port, "Not APDO type (source), ignoring");
2304 continue;
2305 }
2306 }
2307
2308 if (src_pdo) {
c710d0bb
KT		 2309 src = port->source_caps[src_pdo];
2310 snk = port->snk_pdo[snk_pdo];
2311
2312 port->pps_data.min_volt = max(pdo_pps_apdo_min_voltage(src),
2313 pdo_pps_apdo_min_voltage(snk));
2314 port->pps_data.max_volt = min(pdo_pps_apdo_max_voltage(src),
2315 pdo_pps_apdo_max_voltage(snk));
2316 port->pps_data.max_curr = min_pps_apdo_current(src, snk);
2317 port->pps_data.out_volt = min(port->pps_data.max_volt,
a07ddce4
KT		 2318 max(port->pps_data.min_volt,
2319 port->pps_data.out_volt));
c710d0bb
KT		 2320 port->pps_data.op_curr = min(port->pps_data.max_curr,
2321 port->pps_data.op_curr);
2eadc33f
AT		 2322 }
2323
2324 return src_pdo;
2325}
2326
f0690a25
GR		 2327static int tcpm_pd_build_request(struct tcpm_port *port, u32 *rdo)
2328{
2329 unsigned int mv, ma, mw, flags;
2330 unsigned int max_ma, max_mw;
2331 enum pd_pdo_type type;
53fe0de9 2332 u32 pdo, matching_snk_pdo;
0c718676
GKH		 2333 int src_pdo_index = 0;
2334 int snk_pdo_index = 0;
53fe0de9 2335 int ret;
f0690a25 2336
53fe0de9
LJ		 2337 ret = tcpm_pd_select_pdo(port, &snk_pdo_index, &src_pdo_index);
2338 if (ret < 0)
2339 return ret;
2340
2341 pdo = port->source_caps[src_pdo_index];
2342 matching_snk_pdo = port->snk_pdo[snk_pdo_index];
f0690a25
GR		 2343 type = pdo_type(pdo);
2344
2eadc33f
AT		 2345 switch (type) {
2346 case PDO_TYPE_FIXED:
f0690a25 2347 mv = pdo_fixed_voltage(pdo);
2eadc33f
AT		 2348 break;
2349 case PDO_TYPE_BATT:
2350 case PDO_TYPE_VAR:
f0690a25 2351 mv = pdo_min_voltage(pdo);
2eadc33f
AT		 2352 break;
2353 default:
2354 tcpm_log(port, "Invalid PDO selected!");
2355 return -EINVAL;
2356 }
f0690a25 2357
53fe0de9 2358 /* Select maximum available current within the sink pdo's limit */
f0690a25 2359 if (type == PDO_TYPE_BATT) {
53fe0de9
LJ		 2360 mw = min_power(pdo, matching_snk_pdo);
2361 ma = 1000 * mw / mv;
f0690a25 2362 } else {
53fe0de9
LJ		 2363 ma = min_current(pdo, matching_snk_pdo);
2364 mw = ma * mv / 1000;
f0690a25 2365 }
f0690a25 2366
931693f9 2367 flags = RDO_USB_COMM | RDO_NO_SUSPEND;
f0690a25
GR		 2368
2369 /* Set mismatch bit if offered power is less than operating power */
f0690a25
GR		 2370 max_ma = ma;
2371 max_mw = mw;
2372 if (mw < port->operating_snk_mw) {
2373 flags |= RDO_CAP_MISMATCH;
53fe0de9
LJ		 2374 if (type == PDO_TYPE_BATT &&
2375 (pdo_max_power(matching_snk_pdo) > pdo_max_power(pdo)))
2376 max_mw = pdo_max_power(matching_snk_pdo);
2377 else if (pdo_max_current(matching_snk_pdo) >
2378 pdo_max_current(pdo))
2379 max_ma = pdo_max_current(matching_snk_pdo);
f0690a25
GR		 2380 }
2381
2382 tcpm_log(port, "cc=%d cc1=%d cc2=%d vbus=%d vconn=%s polarity=%d",
2383 port->cc_req, port->cc1, port->cc2, port->vbus_source,
2384 port->vconn_role == TYPEC_SOURCE ? "source" : "sink",
2385 port->polarity);
2386
2387 if (type == PDO_TYPE_BATT) {
53fe0de9 2388 *rdo = RDO_BATT(src_pdo_index + 1, mw, max_mw, flags);
f0690a25
GR		 2389
2390 tcpm_log(port, "Requesting PDO %d: %u mV, %u mW%s",
53fe0de9 2391 src_pdo_index, mv, mw,
f0690a25
GR		 2392 flags & RDO_CAP_MISMATCH ? " [mismatch]" : "");
2393 } else {
53fe0de9 2394 *rdo = RDO_FIXED(src_pdo_index + 1, ma, max_ma, flags);
f0690a25
GR		 2395
2396 tcpm_log(port, "Requesting PDO %d: %u mV, %u mA%s",
53fe0de9 2397 src_pdo_index, mv, ma,
f0690a25
GR		 2398 flags & RDO_CAP_MISMATCH ? " [mismatch]" : "");
2399 }
2400
2401 port->current_limit = ma;
2402 port->supply_voltage = mv;
2403
2404 return 0;
2405}
2406
2407static int tcpm_pd_send_request(struct tcpm_port *port)
2408{
2409 struct pd_message msg;
2410 int ret;
2411 u32 rdo;
2412
2413 ret = tcpm_pd_build_request(port, &rdo);
2414 if (ret < 0)
2415 return ret;
2416
2417 memset(&msg, 0, sizeof(msg));
2418 msg.header = PD_HEADER_LE(PD_DATA_REQUEST,
2419 port->pwr_role,
2420 port->data_role,
2eadc33f
AT		 2421 port->negotiated_rev,
2422 port->message_id, 1);
2423 msg.payload[0] = cpu_to_le32(rdo);
2424
2425 return tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
2426}
2427
2428static int tcpm_pd_build_pps_request(struct tcpm_port *port, u32 *rdo)
2429{
8e4657c6 2430 unsigned int out_mv, op_ma, op_mw, max_mv, max_ma, flags;
2eadc33f
AT		 2431 enum pd_pdo_type type;
2432 unsigned int src_pdo_index;
2433 u32 pdo;
2434
2435 src_pdo_index = tcpm_pd_select_pps_apdo(port);
2436 if (!src_pdo_index)
2437 return -EOPNOTSUPP;
2438
2439 pdo = port->source_caps[src_pdo_index];
2440 type = pdo_type(pdo);
2441
2442 switch (type) {
2443 case PDO_TYPE_APDO:
2444 if (pdo_apdo_type(pdo) != APDO_TYPE_PPS) {
2445 tcpm_log(port, "Invalid APDO selected!");
2446 return -EINVAL;
2447 }
2eadc33f
AT		 2448 max_mv = port->pps_data.max_volt;
2449 max_ma = port->pps_data.max_curr;
2450 out_mv = port->pps_data.out_volt;
2451 op_ma = port->pps_data.op_curr;
2452 break;
2453 default:
2454 tcpm_log(port, "Invalid PDO selected!");
2455 return -EINVAL;
2456 }
2457
2458 flags = RDO_USB_COMM | RDO_NO_SUSPEND;
2459
2460 op_mw = (op_ma * out_mv) / 1000;
2461 if (op_mw < port->operating_snk_mw) {
2462 /*
2463 * Try raising current to meet power needs. If that's not enough
2464 * then try upping the voltage. If that's still not enough
2465 * then we've obviously chosen a PPS APDO which really isn't
2466 * suitable so abandon ship.
2467 */
2468 op_ma = (port->operating_snk_mw * 1000) / out_mv;
2469 if ((port->operating_snk_mw * 1000) % out_mv)
2470 ++op_ma;
2471 op_ma += RDO_PROG_CURR_MA_STEP - (op_ma % RDO_PROG_CURR_MA_STEP);
2472
2473 if (op_ma > max_ma) {
2474 op_ma = max_ma;
2475 out_mv = (port->operating_snk_mw * 1000) / op_ma;
2476 if ((port->operating_snk_mw * 1000) % op_ma)
2477 ++out_mv;
2478 out_mv += RDO_PROG_VOLT_MV_STEP -
2479 (out_mv % RDO_PROG_VOLT_MV_STEP);
2480
2481 if (out_mv > max_mv) {
2482 tcpm_log(port, "Invalid PPS APDO selected!");
2483 return -EINVAL;
2484 }
2485 }
2486 }
2487
2488 tcpm_log(port, "cc=%d cc1=%d cc2=%d vbus=%d vconn=%s polarity=%d",
2489 port->cc_req, port->cc1, port->cc2, port->vbus_source,
2490 port->vconn_role == TYPEC_SOURCE ? "source" : "sink",
2491 port->polarity);
2492
2493 *rdo = RDO_PROG(src_pdo_index + 1, out_mv, op_ma, flags);
2494
2495 tcpm_log(port, "Requesting APDO %d: %u mV, %u mA",
2496 src_pdo_index, out_mv, op_ma);
2497
2498 port->pps_data.op_curr = op_ma;
2499 port->pps_data.out_volt = out_mv;
2500
2501 return 0;
2502}
2503
2504static int tcpm_pd_send_pps_request(struct tcpm_port *port)
2505{
2506 struct pd_message msg;
2507 int ret;
2508 u32 rdo;
2509
2510 ret = tcpm_pd_build_pps_request(port, &rdo);
2511 if (ret < 0)
2512 return ret;
2513
2514 memset(&msg, 0, sizeof(msg));
2515 msg.header = PD_HEADER_LE(PD_DATA_REQUEST,
2516 port->pwr_role,
2517 port->data_role,
2518 port->negotiated_rev,
f0690a25
GR		 2519 port->message_id, 1);
2520 msg.payload[0] = cpu_to_le32(rdo);
2521
2522 return tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
2523}
2524
2525static int tcpm_set_vbus(struct tcpm_port *port, bool enable)
2526{
2527 int ret;
2528
2529 if (enable && port->vbus_charge)
2530 return -EINVAL;
2531
2532 tcpm_log(port, "vbus:=%d charge=%d", enable, port->vbus_charge);
2533
2534 ret = port->tcpc->set_vbus(port->tcpc, enable, port->vbus_charge);
2535 if (ret < 0)
2536 return ret;
2537
2538 port->vbus_source = enable;
2539 return 0;
2540}
2541
2542static int tcpm_set_charge(struct tcpm_port *port, bool charge)
2543{
2544 int ret;
2545
2546 if (charge && port->vbus_source)
2547 return -EINVAL;
2548
2549 if (charge != port->vbus_charge) {
2550 tcpm_log(port, "vbus=%d charge:=%d", port->vbus_source, charge);
2551 ret = port->tcpc->set_vbus(port->tcpc, port->vbus_source,
2552 charge);
2553 if (ret < 0)
2554 return ret;
2555 }
2556 port->vbus_charge = charge;
2557 return 0;
2558}
2559
7893f9e1 2560static bool tcpm_start_toggling(struct tcpm_port *port, enum typec_cc_status cc)
f0690a25
GR		 2561{
2562 int ret;
2563
7893f9e1
HG		 2564 if (!port->tcpc->start_toggling)
2565 return false;
f0690a25 2566
7893f9e1
HG		 2567 tcpm_log_force(port, "Start toggling");
2568 ret = port->tcpc->start_toggling(port->tcpc, port->port_type, cc);
2569 return ret == 0;
f0690a25
GR		 2570}
2571
2572static void tcpm_set_cc(struct tcpm_port *port, enum typec_cc_status cc)
2573{
2574 tcpm_log(port, "cc:=%d", cc);
2575 port->cc_req = cc;
2576 port->tcpc->set_cc(port->tcpc, cc);
2577}
2578
2579static int tcpm_init_vbus(struct tcpm_port *port)
2580{
2581 int ret;
2582
2583 ret = port->tcpc->set_vbus(port->tcpc, false, false);
2584 port->vbus_source = false;
2585 port->vbus_charge = false;
2586 return ret;
2587}
2588
2589static int tcpm_init_vconn(struct tcpm_port *port)
2590{
2591 int ret;
2592
2593 ret = port->tcpc->set_vconn(port->tcpc, false);
2594 port->vconn_role = TYPEC_SINK;
2595 return ret;
2596}
2597
2598static void tcpm_typec_connect(struct tcpm_port *port)
2599{
2600 if (!port->connected) {
2601 /* Make sure we don't report stale identity information */
2602 memset(&port->partner_ident, 0, sizeof(port->partner_ident));
2603 port->partner_desc.usb_pd = port->pd_capable;
2604 if (tcpm_port_is_debug(port))
2605 port->partner_desc.accessory = TYPEC_ACCESSORY_DEBUG;
2606 else if (tcpm_port_is_audio(port))
2607 port->partner_desc.accessory = TYPEC_ACCESSORY_AUDIO;
2608 else
2609 port->partner_desc.accessory = TYPEC_ACCESSORY_NONE;
2610 port->partner = typec_register_partner(port->typec_port,
2611 &port->partner_desc);
2612 port->connected = true;
2613 }
2614}
2615
2616static int tcpm_src_attach(struct tcpm_port *port)
2617{
2618 enum typec_cc_polarity polarity =
2619 port->cc2 == TYPEC_CC_RD ? TYPEC_POLARITY_CC2
2620 : TYPEC_POLARITY_CC1;
2621 int ret;
2622
2623 if (port->attached)
2624 return 0;
2625
2626 ret = tcpm_set_polarity(port, polarity);
2627 if (ret < 0)
2628 return ret;
2629
2630 ret = tcpm_set_roles(port, true, TYPEC_SOURCE, TYPEC_HOST);
2631 if (ret < 0)
2632 return ret;
2633
2634 ret = port->tcpc->set_pd_rx(port->tcpc, true);
2635 if (ret < 0)
2636 goto out_disable_mux;
2637
2638 /*
2639 * USB Type-C specification, version 1.2,
2640 * chapter 4.5.2.2.8.1 (Attached.SRC Requirements)
2641 * Enable VCONN only if the non-RD port is set to RA.
2642 */
2643 if ((polarity == TYPEC_POLARITY_CC1 && port->cc2 == TYPEC_CC_RA) ||
2644 (polarity == TYPEC_POLARITY_CC2 && port->cc1 == TYPEC_CC_RA)) {
2645 ret = tcpm_set_vconn(port, true);
2646 if (ret < 0)
2647 goto out_disable_pd;
2648 }
2649
2650 ret = tcpm_set_vbus(port, true);
2651 if (ret < 0)
2652 goto out_disable_vconn;
2653
2654 port->pd_capable = false;
2655
2656 port->partner = NULL;
2657
2658 port->attached = true;
2659 port->send_discover = true;
2660
2661 return 0;
2662
2663out_disable_vconn:
2664 tcpm_set_vconn(port, false);
2665out_disable_pd:
2666 port->tcpc->set_pd_rx(port->tcpc, false);
2667out_disable_mux:
e9576fe8 2668 tcpm_mux_set(port, TYPEC_STATE_SAFE, USB_ROLE_NONE,
2000016c 2669 TYPEC_ORIENTATION_NONE);
f0690a25
GR		 2670 return ret;
2671}
2672
2673static void tcpm_typec_disconnect(struct tcpm_port *port)
2674{
2675 if (port->connected) {
2676 typec_unregister_partner(port->partner);
2677 port->partner = NULL;
2678 port->connected = false;
2679 }
2680}
2681
2682static void tcpm_unregister_altmodes(struct tcpm_port *port)
2683{
2684 struct pd_mode_data *modep = &port->mode_data;
2685 int i;
2686
2687 for (i = 0; i < modep->altmodes; i++) {
2688 typec_unregister_altmode(port->partner_altmode[i]);
2689 port->partner_altmode[i] = NULL;
2690 }
2691
2692 memset(modep, 0, sizeof(*modep));
2693}
2694
2695static void tcpm_reset_port(struct tcpm_port *port)
2696{
2697 tcpm_unregister_altmodes(port);
2698 tcpm_typec_disconnect(port);
2699 port->attached = false;
2700 port->pd_capable = false;
2eadc33f 2701 port->pps_data.supported = false;
f0690a25 2702
5fec4b54
GR		 2703 /*
2704 * First Rx ID should be 0; set this to a sentinel of -1 so that
2705 * we can check tcpm_pd_rx_handler() if we had seen it before.
2706 */
2707 port->rx_msgid = -1;
2708
f0690a25
GR		 2709 port->tcpc->set_pd_rx(port->tcpc, false);
2710 tcpm_init_vbus(port); /* also disables charging */
2711 tcpm_init_vconn(port);
2712 tcpm_set_current_limit(port, 0, 0);
2713 tcpm_set_polarity(port, TYPEC_POLARITY_CC1);
e9576fe8 2714 tcpm_mux_set(port, TYPEC_STATE_SAFE, USB_ROLE_NONE,
2000016c 2715 TYPEC_ORIENTATION_NONE);
f0690a25
GR		 2716 tcpm_set_attached_state(port, false);
2717 port->try_src_count = 0;
2718 port->try_snk_count = 0;
f2a8aa05
AT		 2719 port->usb_type = POWER_SUPPLY_USB_TYPE_C;
2720
2721 power_supply_changed(port->psy);
f0690a25
GR		 2722}
2723
2724static void tcpm_detach(struct tcpm_port *port)
2725{
2726 if (!port->attached)
2727 return;
2728
2729 if (tcpm_port_is_disconnected(port))
2730 port->hard_reset_count = 0;
2731
2732 tcpm_reset_port(port);
2733}
2734
2735static void tcpm_src_detach(struct tcpm_port *port)
2736{
2737 tcpm_detach(port);
2738}
2739
2740static int tcpm_snk_attach(struct tcpm_port *port)
2741{
2742 int ret;
2743
2744 if (port->attached)
2745 return 0;
2746
2747 ret = tcpm_set_polarity(port, port->cc2 != TYPEC_CC_OPEN ?
2748 TYPEC_POLARITY_CC2 : TYPEC_POLARITY_CC1);
2749 if (ret < 0)
2750 return ret;
2751
2752 ret = tcpm_set_roles(port, true, TYPEC_SINK, TYPEC_DEVICE);
2753 if (ret < 0)
2754 return ret;
2755
2756 port->pd_capable = false;
2757
2758 port->partner = NULL;
2759
2760 port->attached = true;
2761 port->send_discover = true;
2762
2763 return 0;
2764}
2765
2766static void tcpm_snk_detach(struct tcpm_port *port)
2767{
2768 tcpm_detach(port);
f0690a25
GR		 2769}
2770
2771static int tcpm_acc_attach(struct tcpm_port *port)
2772{
2773 int ret;
2774
2775 if (port->attached)
2776 return 0;
2777
2778 ret = tcpm_set_roles(port, true, TYPEC_SOURCE, TYPEC_HOST);
2779 if (ret < 0)
2780 return ret;
2781
2782 port->partner = NULL;
2783
2784 tcpm_typec_connect(port);
2785
2786 port->attached = true;
2787
2788 return 0;
2789}
2790
2791static void tcpm_acc_detach(struct tcpm_port *port)
2792{
2793 tcpm_detach(port);
2794}
2795
2796static inline enum tcpm_state hard_reset_state(struct tcpm_port *port)
2797{
2798 if (port->hard_reset_count < PD_N_HARD_RESET_COUNT)
2799 return HARD_RESET_SEND;
2800 if (port->pd_capable)
2801 return ERROR_RECOVERY;
2802 if (port->pwr_role == TYPEC_SOURCE)
2803 return SRC_UNATTACHED;
2804 if (port->state == SNK_WAIT_CAPABILITIES)
2805 return SNK_READY;
2806 return SNK_UNATTACHED;
2807}
2808
f0690a25
GR		 2809static inline enum tcpm_state unattached_state(struct tcpm_port *port)
2810{
13cb492c
BJS		 2811 if (port->port_type == TYPEC_PORT_DRP) {
2812 if (port->pwr_role == TYPEC_SOURCE)
2813 return SRC_UNATTACHED;
2814 else
2815 return SNK_UNATTACHED;
ceeb1625 2816 } else if (port->port_type == TYPEC_PORT_SRC) {
f0690a25 2817 return SRC_UNATTACHED;
13cb492c
BJS		 2818 }
2819
2820 return SNK_UNATTACHED;
f0690a25
GR		 2821}
2822
2823static void tcpm_check_send_discover(struct tcpm_port *port)
2824{
2825 if (port->data_role == TYPEC_HOST && port->send_discover &&
2826 port->pd_capable) {
2827 tcpm_send_vdm(port, USB_SID_PD, CMD_DISCOVER_IDENT, NULL, 0);
2828 port->send_discover = false;
2829 }
2830}
2831
2832static void tcpm_swap_complete(struct tcpm_port *port, int result)
2833{
2834 if (port->swap_pending) {
2835 port->swap_status = result;
2836 port->swap_pending = false;
b17dd571 2837 port->non_pd_role_swap = false;
f0690a25
GR		 2838 complete(&port->swap_complete);
2839 }
2840}
2841
53b70e5c 2842static enum typec_pwr_opmode tcpm_get_pwr_opmode(enum typec_cc_status cc)
fce042f0
BJS		 2843{
2844 switch (cc) {
2845 case TYPEC_CC_RP_1_5:
2846 return TYPEC_PWR_MODE_1_5A;
2847 case TYPEC_CC_RP_3_0:
2848 return TYPEC_PWR_MODE_3_0A;
2849 case TYPEC_CC_RP_DEF:
2850 default:
2851 return TYPEC_PWR_MODE_USB;
2852 }
2853}
2854
f0690a25
GR		 2855static void run_state_machine(struct tcpm_port *port)
2856{
2857 int ret;
fce042f0 2858 enum typec_pwr_opmode opmode;
131c7d12 2859 unsigned int msecs;
f0690a25
GR		 2860
2861 port->enter_state = port->state;
2862 switch (port->state) {
7893f9e1 2863 case TOGGLING:
f0690a25
GR		 2864 break;
2865 /* SRC states */
2866 case SRC_UNATTACHED:
b17dd571
GR		 2867 if (!port->non_pd_role_swap)
2868 tcpm_swap_complete(port, -ENOTCONN);
f0690a25 2869 tcpm_src_detach(port);
7893f9e1
HG		 2870 if (tcpm_start_toggling(port, tcpm_rp_cc(port))) {
2871 tcpm_set_state(port, TOGGLING, 0);
f0690a25
GR		 2872 break;
2873 }
2874 tcpm_set_cc(port, tcpm_rp_cc(port));
9b0ae699 2875 if (port->port_type == TYPEC_PORT_DRP)
f0690a25
GR		 2876 tcpm_set_state(port, SNK_UNATTACHED, PD_T_DRP_SNK);
2877 break;
2878 case SRC_ATTACH_WAIT:
2879 if (tcpm_port_is_debug(port))
2880 tcpm_set_state(port, DEBUG_ACC_ATTACHED,
2881 PD_T_CC_DEBOUNCE);
2882 else if (tcpm_port_is_audio(port))
2883 tcpm_set_state(port, AUDIO_ACC_ATTACHED,
2884 PD_T_CC_DEBOUNCE);
2885 else if (tcpm_port_is_source(port))
2886 tcpm_set_state(port,
2887 tcpm_try_snk(port) ? SNK_TRY
2888 : SRC_ATTACHED,
2889 PD_T_CC_DEBOUNCE);
2890 break;
2891
2892 case SNK_TRY:
2893 port->try_snk_count++;
2894 /*
2895 * Requirements:
2896 * - Do not drive vconn or vbus
2897 * - Terminate CC pins (both) to Rd
2898 * Action:
2899 * - Wait for tDRPTry (PD_T_DRP_TRY).
2900 * Until then, ignore any state changes.
2901 */
2902 tcpm_set_cc(port, TYPEC_CC_RD);
2903 tcpm_set_state(port, SNK_TRY_WAIT, PD_T_DRP_TRY);
2904 break;
2905 case SNK_TRY_WAIT:
a0a3e04e
BJS		 2906 if (tcpm_port_is_sink(port)) {
2907 tcpm_set_state(port, SNK_TRY_WAIT_DEBOUNCE, 0);
2908 } else {
2909 tcpm_set_state(port, SRC_TRYWAIT, 0);
2910 port->max_wait = 0;
2911 }
2912 break;
2913 case SNK_TRY_WAIT_DEBOUNCE:
2914 tcpm_set_state(port, SNK_TRY_WAIT_DEBOUNCE_CHECK_VBUS,
2915 PD_T_PD_DEBOUNCE);
2916 break;
2917 case SNK_TRY_WAIT_DEBOUNCE_CHECK_VBUS:
f0690a25
GR		 2918 if (port->vbus_present && tcpm_port_is_sink(port)) {
2919 tcpm_set_state(port, SNK_ATTACHED, 0);
a0a3e04e
BJS		 2920 } else {
2921 tcpm_set_state(port, SRC_TRYWAIT, 0);
02d5be46 2922 port->max_wait = 0;
f0690a25 2923 }
f0690a25
GR		 2924 break;
2925 case SRC_TRYWAIT:
2926 tcpm_set_cc(port, tcpm_rp_cc(port));
02d5be46
BJS		 2927 if (port->max_wait == 0) {
2928 port->max_wait = jiffies +
2929 msecs_to_jiffies(PD_T_DRP_TRY);
f0690a25
GR		 2930 tcpm_set_state(port, SRC_TRYWAIT_UNATTACHED,
2931 PD_T_DRP_TRY);
02d5be46
BJS		 2932 } else {
2933 if (time_is_after_jiffies(port->max_wait))
2934 tcpm_set_state(port, SRC_TRYWAIT_UNATTACHED,
2935 jiffies_to_msecs(port->max_wait -
2936 jiffies));
2937 else
2938 tcpm_set_state(port, SNK_UNATTACHED, 0);
2939 }
2940 break;
2941 case SRC_TRYWAIT_DEBOUNCE:
2942 tcpm_set_state(port, SRC_ATTACHED, PD_T_CC_DEBOUNCE);
f0690a25
GR		 2943 break;
2944 case SRC_TRYWAIT_UNATTACHED:
2945 tcpm_set_state(port, SNK_UNATTACHED, 0);
2946 break;
2947
2948 case SRC_ATTACHED:
2949 ret = tcpm_src_attach(port);
2950 tcpm_set_state(port, SRC_UNATTACHED,
2951 ret < 0 ? 0 : PD_T_PS_SOURCE_ON);
2952 break;
2953 case SRC_STARTUP:
fce042f0
BJS		 2954 opmode = tcpm_get_pwr_opmode(tcpm_rp_cc(port));
2955 typec_set_pwr_opmode(port->typec_port, opmode);
f0690a25
GR		 2956 port->pwr_opmode = TYPEC_PWR_MODE_USB;
2957 port->caps_count = 0;
2eadc33f 2958 port->negotiated_rev = PD_MAX_REV;
f0690a25 2959 port->message_id = 0;
5fec4b54 2960 port->rx_msgid = -1;
f0690a25
GR		 2961 port->explicit_contract = false;
2962 tcpm_set_state(port, SRC_SEND_CAPABILITIES, 0);
2963 break;
2964 case SRC_SEND_CAPABILITIES:
2965 port->caps_count++;
2966 if (port->caps_count > PD_N_CAPS_COUNT) {
2967 tcpm_set_state(port, SRC_READY, 0);
2968 break;
2969 }
2970 ret = tcpm_pd_send_source_caps(port);
2971 if (ret < 0) {
2972 tcpm_set_state(port, SRC_SEND_CAPABILITIES,
2973 PD_T_SEND_SOURCE_CAP);
2974 } else {
2975 /*
2976 * Per standard, we should clear the reset counter here.
2977 * However, that can result in state machine hang-ups.
2978 * Reset it only in READY state to improve stability.
2979 */
2980 /* port->hard_reset_count = 0; */
2981 port->caps_count = 0;
2982 port->pd_capable = true;
976daf9d 2983 tcpm_set_state_cond(port, SRC_SEND_CAPABILITIES_TIMEOUT,
f0690a25
GR		 2984 PD_T_SEND_SOURCE_CAP);
2985 }
2986 break;
976daf9d
HG		 2987 case SRC_SEND_CAPABILITIES_TIMEOUT:
2988 /*
2989 * Error recovery for a PD_DATA_SOURCE_CAP reply timeout.
2990 *
2991 * PD 2.0 sinks are supposed to accept src-capabilities with a
2992 * 3.0 header and simply ignore any src PDOs which the sink does
2993 * not understand such as PPS but some 2.0 sinks instead ignore
2994 * the entire PD_DATA_SOURCE_CAP message, causing contract
2995 * negotiation to fail.
2996 *
2997 * After PD_N_HARD_RESET_COUNT hard-reset attempts, we try
2998 * sending src-capabilities with a lower PD revision to
2999 * make these broken sinks work.
3000 */
3001 if (port->hard_reset_count < PD_N_HARD_RESET_COUNT) {
3002 tcpm_set_state(port, HARD_RESET_SEND, 0);
3003 } else if (port->negotiated_rev > PD_REV20) {
3004 port->negotiated_rev--;
3005 port->hard_reset_count = 0;
3006 tcpm_set_state(port, SRC_SEND_CAPABILITIES, 0);
3007 } else {
3008 tcpm_set_state(port, hard_reset_state(port), 0);
3009 }
3010 break;
f0690a25
GR		 3011 case SRC_NEGOTIATE_CAPABILITIES:
3012 ret = tcpm_pd_check_request(port);
3013 if (ret < 0) {
3014 tcpm_pd_send_control(port, PD_CTRL_REJECT);
3015 if (!port->explicit_contract) {
3016 tcpm_set_state(port,
3017 SRC_WAIT_NEW_CAPABILITIES, 0);
3018 } else {
3019 tcpm_set_state(port, SRC_READY, 0);
3020 }
3021 } else {
3022 tcpm_pd_send_control(port, PD_CTRL_ACCEPT);
3023 tcpm_set_state(port, SRC_TRANSITION_SUPPLY,
3024 PD_T_SRC_TRANSITION);
3025 }
3026 break;
3027 case SRC_TRANSITION_SUPPLY:
3028 /* XXX: regulator_set_voltage(vbus, ...) */
3029 tcpm_pd_send_control(port, PD_CTRL_PS_RDY);
3030 port->explicit_contract = true;
3031 typec_set_pwr_opmode(port->typec_port, TYPEC_PWR_MODE_PD);
3032 port->pwr_opmode = TYPEC_PWR_MODE_PD;
3033 tcpm_set_state_cond(port, SRC_READY, 0);
3034 break;
3035 case SRC_READY:
3036#if 1
3037 port->hard_reset_count = 0;
3038#endif
3039 port->try_src_count = 0;
3040
3113bf1a 3041 tcpm_swap_complete(port, 0);
f0690a25 3042 tcpm_typec_connect(port);
2eadc33f 3043
f0690a25
GR		 3044 tcpm_check_send_discover(port);
3045 /*
3046 * 6.3.5
3047 * Sending ping messages is not necessary if
3048 * - the source operates at vSafe5V
3049 * or
3050 * - The system is not operating in PD mode
3051 * or
3052 * - Both partners are connected using a Type-C connector
f451ac9e
BJS		 3053 *
3054 * There is no actual need to send PD messages since the local
3055 * port type-c and the spec does not clearly say whether PD is
3056 * possible when type-c is connected to Type-A/B
f0690a25 3057 */
f0690a25
GR		 3058 break;
3059 case SRC_WAIT_NEW_CAPABILITIES:
3060 /* Nothing to do... */
3061 break;
3062
3063 /* SNK states */
3064 case SNK_UNATTACHED:
b17dd571
GR		 3065 if (!port->non_pd_role_swap)
3066 tcpm_swap_complete(port, -ENOTCONN);
2eadc33f 3067 tcpm_pps_complete(port, -ENOTCONN);
f0690a25 3068 tcpm_snk_detach(port);
7893f9e1
HG		 3069 if (tcpm_start_toggling(port, TYPEC_CC_RD)) {
3070 tcpm_set_state(port, TOGGLING, 0);
f0690a25
GR		 3071 break;
3072 }
3073 tcpm_set_cc(port, TYPEC_CC_RD);
9b0ae699 3074 if (port->port_type == TYPEC_PORT_DRP)
f0690a25
GR		 3075 tcpm_set_state(port, SRC_UNATTACHED, PD_T_DRP_SRC);
3076 break;
3077 case SNK_ATTACH_WAIT:
3078 if ((port->cc1 == TYPEC_CC_OPEN &&
3079 port->cc2 != TYPEC_CC_OPEN) ||
3080 (port->cc1 != TYPEC_CC_OPEN &&
3081 port->cc2 == TYPEC_CC_OPEN))
3082 tcpm_set_state(port, SNK_DEBOUNCED,
3083 PD_T_CC_DEBOUNCE);
3084 else if (tcpm_port_is_disconnected(port))
3085 tcpm_set_state(port, SNK_UNATTACHED,
3086 PD_T_PD_DEBOUNCE);
3087 break;
3088 case SNK_DEBOUNCED:
3089 if (tcpm_port_is_disconnected(port))
3090 tcpm_set_state(port, SNK_UNATTACHED,
3091 PD_T_PD_DEBOUNCE);
3092 else if (port->vbus_present)
3093 tcpm_set_state(port,
3094 tcpm_try_src(port) ? SRC_TRY
3095 : SNK_ATTACHED,
3096 0);
3097 else
3098 /* Wait for VBUS, but not forever */
56277035 3099 tcpm_set_state(port, PORT_RESET, PD_T_PS_SOURCE_ON);
f0690a25
GR		 3100 break;
3101
3102 case SRC_TRY:
3103 port->try_src_count++;
3104 tcpm_set_cc(port, tcpm_rp_cc(port));
131c7d12
BJS		 3105 port->max_wait = 0;
3106 tcpm_set_state(port, SRC_TRY_WAIT, 0);
3107 break;
3108 case SRC_TRY_WAIT:
3109 if (port->max_wait == 0) {
3110 port->max_wait = jiffies +
3111 msecs_to_jiffies(PD_T_DRP_TRY);
3112 msecs = PD_T_DRP_TRY;
3113 } else {
3114 if (time_is_after_jiffies(port->max_wait))
3115 msecs = jiffies_to_msecs(port->max_wait -
3116 jiffies);
3117 else
3118 msecs = 0;
3119 }
3120 tcpm_set_state(port, SNK_TRYWAIT, msecs);
f0690a25
GR		 3121 break;
3122 case SRC_TRY_DEBOUNCE:
3123 tcpm_set_state(port, SRC_ATTACHED, PD_T_PD_DEBOUNCE);
3124 break;
3125 case SNK_TRYWAIT:
3126 tcpm_set_cc(port, TYPEC_CC_RD);
af450ebb 3127 tcpm_set_state(port, SNK_TRYWAIT_VBUS, PD_T_CC_DEBOUNCE);
f0690a25 3128 break;
af450ebb
BJS		 3129 case SNK_TRYWAIT_VBUS:
3130 /*
3131 * TCPM stays in this state indefinitely until VBUS
3132 * is detected as long as Rp is not detected for
3133 * more than a time period of tPDDebounce.
3134 */
3135 if (port->vbus_present && tcpm_port_is_sink(port)) {
f0690a25
GR		 3136 tcpm_set_state(port, SNK_ATTACHED, 0);
3137 break;
3138 }
af450ebb
BJS		 3139 if (!tcpm_port_is_sink(port))
3140 tcpm_set_state(port, SNK_TRYWAIT_DEBOUNCE, 0);
f0690a25 3141 break;
af450ebb
BJS		 3142 case SNK_TRYWAIT_DEBOUNCE:
3143 tcpm_set_state(port, SNK_UNATTACHED, PD_T_PD_DEBOUNCE);
f0690a25 3144 break;
f0690a25
GR		 3145 case SNK_ATTACHED:
3146 ret = tcpm_snk_attach(port);
3147 if (ret < 0)
3148 tcpm_set_state(port, SNK_UNATTACHED, 0);
3149 else
3150 tcpm_set_state(port, SNK_STARTUP, 0);
3151 break;
3152 case SNK_STARTUP:
fce042f0
BJS		 3153 opmode = tcpm_get_pwr_opmode(port->polarity ?
3154 port->cc2 : port->cc1);
3155 typec_set_pwr_opmode(port->typec_port, opmode);
f0690a25 3156 port->pwr_opmode = TYPEC_PWR_MODE_USB;
2eadc33f 3157 port->negotiated_rev = PD_MAX_REV;
f0690a25 3158 port->message_id = 0;
5fec4b54 3159 port->rx_msgid = -1;
f0690a25
GR		 3160 port->explicit_contract = false;
3161 tcpm_set_state(port, SNK_DISCOVERY, 0);
3162 break;
3163 case SNK_DISCOVERY:
3164 if (port->vbus_present) {
3165 tcpm_set_current_limit(port,
3166 tcpm_get_current_limit(port),
3167 5000);
3168 tcpm_set_charge(port, true);
3169 tcpm_set_state(port, SNK_WAIT_CAPABILITIES, 0);
3170 break;
3171 }
3172 /*
3173 * For DRP, timeouts differ. Also, handling is supposed to be
3174 * different and much more complex (dead battery detection;
3175 * see USB power delivery specification, section 8.3.3.6.1.5.1).
3176 */
3177 tcpm_set_state(port, hard_reset_state(port),
9b0ae699 3178 port->port_type == TYPEC_PORT_DRP ?
f0690a25
GR		 3179 PD_T_DB_DETECT : PD_T_NO_RESPONSE);
3180 break;
3181 case SNK_DISCOVERY_DEBOUNCE:
3182 tcpm_set_state(port, SNK_DISCOVERY_DEBOUNCE_DONE,
3183 PD_T_CC_DEBOUNCE);
3184 break;
3185 case SNK_DISCOVERY_DEBOUNCE_DONE:
3186 if (!tcpm_port_is_disconnected(port) &&
3187 tcpm_port_is_sink(port) &&
3188 time_is_after_jiffies(port->delayed_runtime)) {
3189 tcpm_set_state(port, SNK_DISCOVERY,
9578bcd0
DC		 3190 jiffies_to_msecs(port->delayed_runtime -
3191 jiffies));
f0690a25
GR		 3192 break;
3193 }
3194 tcpm_set_state(port, unattached_state(port), 0);
3195 break;
3196 case SNK_WAIT_CAPABILITIES:
3197 ret = port->tcpc->set_pd_rx(port->tcpc, true);
3198 if (ret < 0) {
3199 tcpm_set_state(port, SNK_READY, 0);
3200 break;
3201 }
3202 /*
3203 * If VBUS has never been low, and we time out waiting
3204 * for source cap, try a soft reset first, in case we
3205 * were already in a stable contract before this boot.
3206 * Do this only once.
3207 */
3208 if (port->vbus_never_low) {
3209 port->vbus_never_low = false;
3210 tcpm_set_state(port, SOFT_RESET_SEND,
3211 PD_T_SINK_WAIT_CAP);
3212 } else {
3213 tcpm_set_state(port, hard_reset_state(port),
3214 PD_T_SINK_WAIT_CAP);
3215 }
3216 break;
3217 case SNK_NEGOTIATE_CAPABILITIES:
3218 port->pd_capable = true;
3219 port->hard_reset_count = 0;
3220 ret = tcpm_pd_send_request(port);
3221 if (ret < 0) {
3222 /* Let the Source send capabilities again. */
3223 tcpm_set_state(port, SNK_WAIT_CAPABILITIES, 0);
3224 } else {
3225 tcpm_set_state_cond(port, hard_reset_state(port),
3226 PD_T_SENDER_RESPONSE);
3227 }
3228 break;
2eadc33f
AT		 3229 case SNK_NEGOTIATE_PPS_CAPABILITIES:
3230 ret = tcpm_pd_send_pps_request(port);
3231 if (ret < 0) {
3232 port->pps_status = ret;
3233 /*
3234 * If this was called due to updates to sink
3235 * capabilities, and pps is no longer valid, we should
3236 * safely fall back to a standard PDO.
3237 */
3238 if (port->update_sink_caps)
3239 tcpm_set_state(port, SNK_NEGOTIATE_CAPABILITIES, 0);
3240 else
3241 tcpm_set_state(port, SNK_READY, 0);
3242 } else {
3243 tcpm_set_state_cond(port, hard_reset_state(port),
3244 PD_T_SENDER_RESPONSE);
3245 }
3246 break;
f0690a25
GR		 3247 case SNK_TRANSITION_SINK:
3248 case SNK_TRANSITION_SINK_VBUS:
3249 tcpm_set_state(port, hard_reset_state(port),
3250 PD_T_PS_TRANSITION);
3251 break;
3252 case SNK_READY:
3253 port->try_snk_count = 0;
2eadc33f 3254 port->update_sink_caps = false;
8bf05746
BJS		 3255 if (port->explicit_contract) {
3256 typec_set_pwr_opmode(port->typec_port,
3257 TYPEC_PWR_MODE_PD);
3258 port->pwr_opmode = TYPEC_PWR_MODE_PD;
3259 }
f0690a25 3260
3113bf1a 3261 tcpm_swap_complete(port, 0);
f0690a25 3262 tcpm_typec_connect(port);
f0690a25 3263 tcpm_check_send_discover(port);
2eadc33f
AT		 3264 tcpm_pps_complete(port, port->pps_status);
3265
f2a8aa05
AT		 3266 power_supply_changed(port->psy);
3267
f0690a25
GR		 3268 break;
3269
3270 /* Accessory states */
3271 case ACC_UNATTACHED:
3272 tcpm_acc_detach(port);
3273 tcpm_set_state(port, SRC_UNATTACHED, 0);
3274 break;
3275 case DEBUG_ACC_ATTACHED:
3276 case AUDIO_ACC_ATTACHED:
3277 ret = tcpm_acc_attach(port);
3278 if (ret < 0)
3279 tcpm_set_state(port, ACC_UNATTACHED, 0);
3280 break;
3281 case AUDIO_ACC_DEBOUNCE:
3282 tcpm_set_state(port, ACC_UNATTACHED, PD_T_CC_DEBOUNCE);
3283 break;
3284
3285 /* Hard_Reset states */
3286 case HARD_RESET_SEND:
3287 tcpm_pd_transmit(port, TCPC_TX_HARD_RESET, NULL);
3288 tcpm_set_state(port, HARD_RESET_START, 0);
3289 break;
3290 case HARD_RESET_START:
3291 port->hard_reset_count++;
3292 port->tcpc->set_pd_rx(port->tcpc, false);
3293 tcpm_unregister_altmodes(port);
3294 port->send_discover = true;
3295 if (port->pwr_role == TYPEC_SOURCE)
3296 tcpm_set_state(port, SRC_HARD_RESET_VBUS_OFF,
3297 PD_T_PS_HARD_RESET);
3298 else
3299 tcpm_set_state(port, SNK_HARD_RESET_SINK_OFF, 0);
3300 break;
3301 case SRC_HARD_RESET_VBUS_OFF:
3302 tcpm_set_vconn(port, true);
3303 tcpm_set_vbus(port, false);
23b5f732
BJS		 3304 tcpm_set_roles(port, port->self_powered, TYPEC_SOURCE,
3305 TYPEC_HOST);
f0690a25
GR		 3306 tcpm_set_state(port, SRC_HARD_RESET_VBUS_ON, PD_T_SRC_RECOVER);
3307 break;
3308 case SRC_HARD_RESET_VBUS_ON:
3309 tcpm_set_vbus(port, true);
3310 port->tcpc->set_pd_rx(port->tcpc, true);
3311 tcpm_set_attached_state(port, true);
3312 tcpm_set_state(port, SRC_UNATTACHED, PD_T_PS_SOURCE_ON);
3313 break;
3314 case SNK_HARD_RESET_SINK_OFF:
2eadc33f 3315 memset(&port->pps_data, 0, sizeof(port->pps_data));
f0690a25 3316 tcpm_set_vconn(port, false);
157c0f2f
BJS		 3317 if (port->pd_capable)
3318 tcpm_set_charge(port, false);
23b5f732
BJS		 3319 tcpm_set_roles(port, port->self_powered, TYPEC_SINK,
3320 TYPEC_DEVICE);
f0690a25
GR		 3321 /*
3322 * VBUS may or may not toggle, depending on the adapter.
3323 * If it doesn't toggle, transition to SNK_HARD_RESET_SINK_ON
3324 * directly after timeout.
3325 */
3326 tcpm_set_state(port, SNK_HARD_RESET_SINK_ON, PD_T_SAFE_0V);
3327 break;
3328 case SNK_HARD_RESET_WAIT_VBUS:
3329 /* Assume we're disconnected if VBUS doesn't come back. */
3330 tcpm_set_state(port, SNK_UNATTACHED,
3331 PD_T_SRC_RECOVER_MAX + PD_T_SRC_TURN_ON);
3332 break;
3333 case SNK_HARD_RESET_SINK_ON:
3334 /* Note: There is no guarantee that VBUS is on in this state */
3335 /*
3336 * XXX:
3337 * The specification suggests that dual mode ports in sink
3338 * mode should transition to state PE_SRC_Transition_to_default.
3339 * See USB power delivery specification chapter 8.3.3.6.1.3.
3340 * This would mean to to
3341 * - turn off VCONN, reset power supply
3342 * - request hardware reset
3343 * - turn on VCONN
3344 * - Transition to state PE_Src_Startup
3345 * SNK only ports shall transition to state Snk_Startup
3346 * (see chapter 8.3.3.3.8).
3347 * Similar, dual-mode ports in source mode should transition
3348 * to PE_SNK_Transition_to_default.
3349 */
157c0f2f
BJS		 3350 if (port->pd_capable) {
3351 tcpm_set_current_limit(port,
3352 tcpm_get_current_limit(port),
3353 5000);
3354 tcpm_set_charge(port, true);
3355 }
f0690a25
GR		 3356 tcpm_set_attached_state(port, true);
3357 tcpm_set_state(port, SNK_STARTUP, 0);
3358 break;
3359
3360 /* Soft_Reset states */
3361 case SOFT_RESET:
3362 port->message_id = 0;
5fec4b54 3363 port->rx_msgid = -1;
f0690a25
GR		 3364 tcpm_pd_send_control(port, PD_CTRL_ACCEPT);
3365 if (port->pwr_role == TYPEC_SOURCE)
3366 tcpm_set_state(port, SRC_SEND_CAPABILITIES, 0);
3367 else
3368 tcpm_set_state(port, SNK_WAIT_CAPABILITIES, 0);
3369 break;
3370 case SOFT_RESET_SEND:
3371 port->message_id = 0;
5fec4b54 3372 port->rx_msgid = -1;
f0690a25
GR		 3373 if (tcpm_pd_send_control(port, PD_CTRL_SOFT_RESET))
3374 tcpm_set_state_cond(port, hard_reset_state(port), 0);
3375 else
3376 tcpm_set_state_cond(port, hard_reset_state(port),
3377 PD_T_SENDER_RESPONSE);
3378 break;
3379
3380 /* DR_Swap states */
3381 case DR_SWAP_SEND:
3382 tcpm_pd_send_control(port, PD_CTRL_DR_SWAP);
3383 tcpm_set_state_cond(port, DR_SWAP_SEND_TIMEOUT,
3384 PD_T_SENDER_RESPONSE);
3385 break;
3386 case DR_SWAP_ACCEPT:
3387 tcpm_pd_send_control(port, PD_CTRL_ACCEPT);
3388 tcpm_set_state_cond(port, DR_SWAP_CHANGE_DR, 0);
3389 break;
3390 case DR_SWAP_SEND_TIMEOUT:
3391 tcpm_swap_complete(port, -ETIMEDOUT);
3392 tcpm_set_state(port, ready_state(port), 0);
3393 break;
3394 case DR_SWAP_CHANGE_DR:
3395 if (port->data_role == TYPEC_HOST) {
3396 tcpm_unregister_altmodes(port);
3397 tcpm_set_roles(port, true, port->pwr_role,
3398 TYPEC_DEVICE);
3399 } else {
3400 tcpm_set_roles(port, true, port->pwr_role,
3401 TYPEC_HOST);
3402 port->send_discover = true;
3403 }
f0690a25
GR		 3404 tcpm_set_state(port, ready_state(port), 0);
3405 break;
3406
3407 /* PR_Swap states */
3408 case PR_SWAP_ACCEPT:
3409 tcpm_pd_send_control(port, PD_CTRL_ACCEPT);
3410 tcpm_set_state(port, PR_SWAP_START, 0);
3411 break;
3412 case PR_SWAP_SEND:
3413 tcpm_pd_send_control(port, PD_CTRL_PR_SWAP);
3414 tcpm_set_state_cond(port, PR_SWAP_SEND_TIMEOUT,
3415 PD_T_SENDER_RESPONSE);
3416 break;
3417 case PR_SWAP_SEND_TIMEOUT:
3418 tcpm_swap_complete(port, -ETIMEDOUT);
3419 tcpm_set_state(port, ready_state(port), 0);
3420 break;
3421 case PR_SWAP_START:
3422 if (port->pwr_role == TYPEC_SOURCE)
3423 tcpm_set_state(port, PR_SWAP_SRC_SNK_TRANSITION_OFF,
3424 PD_T_SRC_TRANSITION);
3425 else
3426 tcpm_set_state(port, PR_SWAP_SNK_SRC_SINK_OFF, 0);
3427 break;
3428 case PR_SWAP_SRC_SNK_TRANSITION_OFF:
3429 tcpm_set_vbus(port, false);
3430 port->explicit_contract = false;
b965b631 3431 /* allow time for Vbus discharge, must be < tSrcSwapStdby */
f0690a25 3432 tcpm_set_state(port, PR_SWAP_SRC_SNK_SOURCE_OFF,
b965b631 3433 PD_T_SRCSWAPSTDBY);
f0690a25
GR		 3434 break;
3435 case PR_SWAP_SRC_SNK_SOURCE_OFF:
3436 tcpm_set_cc(port, TYPEC_CC_RD);
b965b631
BJS		 3437 /* allow CC debounce */
3438 tcpm_set_state(port, PR_SWAP_SRC_SNK_SOURCE_OFF_CC_DEBOUNCED,
3439 PD_T_CC_DEBOUNCE);
3440 break;
3441 case PR_SWAP_SRC_SNK_SOURCE_OFF_CC_DEBOUNCED:
050161ea
GR		 3442 /*
3443 * USB-PD standard, 6.2.1.4, Port Power Role:
3444 * "During the Power Role Swap Sequence, for the initial Source
3445 * Port, the Port Power Role field shall be set to Sink in the
3446 * PS_RDY Message indicating that the initial Source’s power
3447 * supply is turned off"
3448 */
3449 tcpm_set_pwr_role(port, TYPEC_SINK);
f0690a25
GR		 3450 if (tcpm_pd_send_control(port, PD_CTRL_PS_RDY)) {
3451 tcpm_set_state(port, ERROR_RECOVERY, 0);
3452 break;
3453 }
3454 tcpm_set_state_cond(port, SNK_UNATTACHED, PD_T_PS_SOURCE_ON);
3455 break;
3456 case PR_SWAP_SRC_SNK_SINK_ON:
f0690a25
GR		 3457 tcpm_set_state(port, SNK_STARTUP, 0);
3458 break;
3459 case PR_SWAP_SNK_SRC_SINK_OFF:
3460 tcpm_set_charge(port, false);
3461 tcpm_set_state(port, hard_reset_state(port),
3462 PD_T_PS_SOURCE_OFF);
3463 break;
3464 case PR_SWAP_SNK_SRC_SOURCE_ON:
3465 tcpm_set_cc(port, tcpm_rp_cc(port));
3466 tcpm_set_vbus(port, true);
b965b631
BJS		 3467 /*
3468 * allow time VBUS ramp-up, must be < tNewSrc
3469 * Also, this window overlaps with CC debounce as well.
3470 * So, Wait for the max of two which is PD_T_NEWSRC
3471 */
3472 tcpm_set_state(port, PR_SWAP_SNK_SRC_SOURCE_ON_VBUS_RAMPED_UP,
3473 PD_T_NEWSRC);
3474 break;
3475 case PR_SWAP_SNK_SRC_SOURCE_ON_VBUS_RAMPED_UP:
050161ea
GR		 3476 /*
3477 * USB PD standard, 6.2.1.4:
3478 * "Subsequent Messages initiated by the Policy Engine,
3479 * such as the PS_RDY Message sent to indicate that Vbus
3480 * is ready, will have the Port Power Role field set to
3481 * Source."
3482 */
f0690a25 3483 tcpm_set_pwr_role(port, TYPEC_SOURCE);
050161ea 3484 tcpm_pd_send_control(port, PD_CTRL_PS_RDY);
f0690a25
GR		 3485 tcpm_set_state(port, SRC_STARTUP, 0);
3486 break;
3487
3488 case VCONN_SWAP_ACCEPT:
3489 tcpm_pd_send_control(port, PD_CTRL_ACCEPT);
3490 tcpm_set_state(port, VCONN_SWAP_START, 0);
3491 break;
3492 case VCONN_SWAP_SEND:
3493 tcpm_pd_send_control(port, PD_CTRL_VCONN_SWAP);
3494 tcpm_set_state(port, VCONN_SWAP_SEND_TIMEOUT,
3495 PD_T_SENDER_RESPONSE);
3496 break;
3497 case VCONN_SWAP_SEND_TIMEOUT:
3498 tcpm_swap_complete(port, -ETIMEDOUT);
3499 tcpm_set_state(port, ready_state(port), 0);
3500 break;
3501 case VCONN_SWAP_START:
3502 if (port->vconn_role == TYPEC_SOURCE)
3503 tcpm_set_state(port, VCONN_SWAP_WAIT_FOR_VCONN, 0);
3504 else
3505 tcpm_set_state(port, VCONN_SWAP_TURN_ON_VCONN, 0);
3506 break;
3507 case VCONN_SWAP_WAIT_FOR_VCONN:
3508 tcpm_set_state(port, hard_reset_state(port),
3509 PD_T_VCONN_SOURCE_ON);
3510 break;
3511 case VCONN_SWAP_TURN_ON_VCONN:
3512 tcpm_set_vconn(port, true);
3513 tcpm_pd_send_control(port, PD_CTRL_PS_RDY);
f0690a25
GR		 3514 tcpm_set_state(port, ready_state(port), 0);
3515 break;
3516 case VCONN_SWAP_TURN_OFF_VCONN:
3517 tcpm_set_vconn(port, false);
f0690a25
GR		 3518 tcpm_set_state(port, ready_state(port), 0);
3519 break;
3520
3521 case DR_SWAP_CANCEL:
3522 case PR_SWAP_CANCEL:
3523 case VCONN_SWAP_CANCEL:
3524 tcpm_swap_complete(port, port->swap_status);
3525 if (port->pwr_role == TYPEC_SOURCE)
3526 tcpm_set_state(port, SRC_READY, 0);
3527 else
3528 tcpm_set_state(port, SNK_READY, 0);
3529 break;
3530
3531 case BIST_RX:
3532 switch (BDO_MODE_MASK(port->bist_request)) {
3533 case BDO_MODE_CARRIER2:
3534 tcpm_pd_transmit(port, TCPC_TX_BIST_MODE_2, NULL);
3535 break;
3536 default:
3537 break;
3538 }
3539 /* Always switch to unattached state */
3540 tcpm_set_state(port, unattached_state(port), 0);
3541 break;
64f7c494
AT		 3542 case GET_STATUS_SEND:
3543 tcpm_pd_send_control(port, PD_CTRL_GET_STATUS);
3544 tcpm_set_state(port, GET_STATUS_SEND_TIMEOUT,
3545 PD_T_SENDER_RESPONSE);
3546 break;
3547 case GET_STATUS_SEND_TIMEOUT:
3548 tcpm_set_state(port, ready_state(port), 0);
3549 break;
3550 case GET_PPS_STATUS_SEND:
3551 tcpm_pd_send_control(port, PD_CTRL_GET_PPS_STATUS);
3552 tcpm_set_state(port, GET_PPS_STATUS_SEND_TIMEOUT,
3553 PD_T_SENDER_RESPONSE);
3554 break;
3555 case GET_PPS_STATUS_SEND_TIMEOUT:
3556 tcpm_set_state(port, ready_state(port), 0);
3557 break;
f0690a25
GR		 3558 case ERROR_RECOVERY:
3559 tcpm_swap_complete(port, -EPROTO);
2eadc33f 3560 tcpm_pps_complete(port, -EPROTO);
b17dd571
GR		 3561 tcpm_set_state(port, PORT_RESET, 0);
3562 break;
3563 case PORT_RESET:
f0690a25 3564 tcpm_reset_port(port);
f0690a25 3565 tcpm_set_cc(port, TYPEC_CC_OPEN);
b17dd571 3566 tcpm_set_state(port, PORT_RESET_WAIT_OFF,
f0690a25
GR		 3567 PD_T_ERROR_RECOVERY);
3568 break;
b17dd571 3569 case PORT_RESET_WAIT_OFF:
f0690a25
GR		 3570 tcpm_set_state(port,
3571 tcpm_default_state(port),
3572 port->vbus_present ? PD_T_PS_SOURCE_OFF : 0);
3573 break;
3574 default:
3575 WARN(1, "Unexpected port state %d\n", port->state);
3576 break;
3577 }
3578}
3579
3580static void tcpm_state_machine_work(struct work_struct *work)
3581{
3582 struct tcpm_port *port = container_of(work, struct tcpm_port,
3583 state_machine.work);
3584 enum tcpm_state prev_state;
3585
3586 mutex_lock(&port->lock);
3587 port->state_machine_running = true;
3588
3589 if (port->queued_message && tcpm_send_queued_message(port))
3590 goto done;
3591
3592 /* If we were queued due to a delayed state change, update it now */
3593 if (port->delayed_state) {
3594 tcpm_log(port, "state change %s -> %s [delayed %ld ms]",
3595 tcpm_states[port->state],
3596 tcpm_states[port->delayed_state], port->delay_ms);
3597 port->prev_state = port->state;
3598 port->state = port->delayed_state;
3599 port->delayed_state = INVALID_STATE;
3600 }
3601
3602 /*
3603 * Continue running as long as we have (non-delayed) state changes
3604 * to make.
3605 */
3606 do {
3607 prev_state = port->state;
3608 run_state_machine(port);
3609 if (port->queued_message)
3610 tcpm_send_queued_message(port);
3611 } while (port->state != prev_state && !port->delayed_state);
3612
3613done:
3614 port->state_machine_running = false;
3615 mutex_unlock(&port->lock);
3616}
3617
3618static void _tcpm_cc_change(struct tcpm_port *port, enum typec_cc_status cc1,
3619 enum typec_cc_status cc2)
3620{
3621 enum typec_cc_status old_cc1, old_cc2;
3622 enum tcpm_state new_state;
3623
3624 old_cc1 = port->cc1;
3625 old_cc2 = port->cc2;
3626 port->cc1 = cc1;
3627 port->cc2 = cc2;
3628
3629 tcpm_log_force(port,
3630 "CC1: %u -> %u, CC2: %u -> %u [state %s, polarity %d, %s]",
3631 old_cc1, cc1, old_cc2, cc2, tcpm_states[port->state],
3632 port->polarity,
3633 tcpm_port_is_disconnected(port) ? "disconnected"
3634 : "connected");
3635
3636 switch (port->state) {
7893f9e1 3637 case TOGGLING:
f0690a25
GR		 3638 if (tcpm_port_is_debug(port) || tcpm_port_is_audio(port) ||
3639 tcpm_port_is_source(port))
3640 tcpm_set_state(port, SRC_ATTACH_WAIT, 0);
3641 else if (tcpm_port_is_sink(port))
3642 tcpm_set_state(port, SNK_ATTACH_WAIT, 0);
3643 break;
3644 case SRC_UNATTACHED:
3645 case ACC_UNATTACHED:
3646 if (tcpm_port_is_debug(port) || tcpm_port_is_audio(port) ||
3647 tcpm_port_is_source(port))
3648 tcpm_set_state(port, SRC_ATTACH_WAIT, 0);
3649 break;
3650 case SRC_ATTACH_WAIT:
3651 if (tcpm_port_is_disconnected(port) ||
3652 tcpm_port_is_audio_detached(port))
3653 tcpm_set_state(port, SRC_UNATTACHED, 0);
3654 else if (cc1 != old_cc1 || cc2 != old_cc2)
3655 tcpm_set_state(port, SRC_ATTACH_WAIT, 0);
3656 break;
3657 case SRC_ATTACHED:
f3b73364
BJS		 3658 case SRC_SEND_CAPABILITIES:
3659 case SRC_READY:
3660 if (tcpm_port_is_disconnected(port) ||
3661 !tcpm_port_is_source(port))
f0690a25
GR		 3662 tcpm_set_state(port, SRC_UNATTACHED, 0);
3663 break;
f0690a25
GR		 3664 case SNK_UNATTACHED:
3665 if (tcpm_port_is_sink(port))
3666 tcpm_set_state(port, SNK_ATTACH_WAIT, 0);
3667 break;
3668 case SNK_ATTACH_WAIT:
3669 if ((port->cc1 == TYPEC_CC_OPEN &&
3670 port->cc2 != TYPEC_CC_OPEN) ||
3671 (port->cc1 != TYPEC_CC_OPEN &&
3672 port->cc2 == TYPEC_CC_OPEN))
3673 new_state = SNK_DEBOUNCED;
3674 else if (tcpm_port_is_disconnected(port))
3675 new_state = SNK_UNATTACHED;
3676 else
3677 break;
3678 if (new_state != port->delayed_state)
3679 tcpm_set_state(port, SNK_ATTACH_WAIT, 0);
3680 break;
3681 case SNK_DEBOUNCED:
3682 if (tcpm_port_is_disconnected(port))
3683 new_state = SNK_UNATTACHED;
3684 else if (port->vbus_present)
3685 new_state = tcpm_try_src(port) ? SRC_TRY : SNK_ATTACHED;
3686 else
3687 new_state = SNK_UNATTACHED;
3688 if (new_state != port->delayed_state)
3689 tcpm_set_state(port, SNK_DEBOUNCED, 0);
3690 break;
3691 case SNK_READY:
3692 if (tcpm_port_is_disconnected(port))
3693 tcpm_set_state(port, unattached_state(port), 0);
3694 else if (!port->pd_capable &&
3695 (cc1 != old_cc1 || cc2 != old_cc2))
3696 tcpm_set_current_limit(port,
3697 tcpm_get_current_limit(port),
3698 5000);
3699 break;
3700
3701 case AUDIO_ACC_ATTACHED:
3702 if (cc1 == TYPEC_CC_OPEN || cc2 == TYPEC_CC_OPEN)
3703 tcpm_set_state(port, AUDIO_ACC_DEBOUNCE, 0);
3704 break;
3705 case AUDIO_ACC_DEBOUNCE:
3706 if (tcpm_port_is_audio(port))
3707 tcpm_set_state(port, AUDIO_ACC_ATTACHED, 0);
3708 break;
3709
3710 case DEBUG_ACC_ATTACHED:
3711 if (cc1 == TYPEC_CC_OPEN || cc2 == TYPEC_CC_OPEN)
3712 tcpm_set_state(port, ACC_UNATTACHED, 0);
3713 break;
3714
3715 case SNK_TRY:
3716 /* Do nothing, waiting for timeout */
3717 break;
3718
3719 case SNK_DISCOVERY:
3720 /* CC line is unstable, wait for debounce */
3721 if (tcpm_port_is_disconnected(port))
3722 tcpm_set_state(port, SNK_DISCOVERY_DEBOUNCE, 0);
3723 break;
3724 case SNK_DISCOVERY_DEBOUNCE:
3725 break;
3726
3727 case SRC_TRYWAIT:
3728 /* Hand over to state machine if needed */
3729 if (!port->vbus_present && tcpm_port_is_source(port))
02d5be46
BJS		 3730 tcpm_set_state(port, SRC_TRYWAIT_DEBOUNCE, 0);
3731 break;
3732 case SRC_TRYWAIT_DEBOUNCE:
3733 if (port->vbus_present || !tcpm_port_is_source(port))
f0690a25
GR		 3734 tcpm_set_state(port, SRC_TRYWAIT, 0);
3735 break;
a0a3e04e
BJS		 3736 case SNK_TRY_WAIT_DEBOUNCE:
3737 if (!tcpm_port_is_sink(port)) {
3738 port->max_wait = 0;
3739 tcpm_set_state(port, SRC_TRYWAIT, 0);
f0690a25 3740 }
f0690a25 3741 break;
131c7d12 3742 case SRC_TRY_WAIT:
c79d92bd
BJS		 3743 if (tcpm_port_is_source(port))
3744 tcpm_set_state(port, SRC_TRY_DEBOUNCE, 0);
f0690a25
GR		 3745 break;
3746 case SRC_TRY_DEBOUNCE:
131c7d12 3747 tcpm_set_state(port, SRC_TRY_WAIT, 0);
f0690a25
GR		 3748 break;
3749 case SNK_TRYWAIT_DEBOUNCE:
af450ebb
BJS		 3750 if (tcpm_port_is_sink(port))
3751 tcpm_set_state(port, SNK_TRYWAIT_VBUS, 0);
3752 break;
3753 case SNK_TRYWAIT_VBUS:
3754 if (!tcpm_port_is_sink(port))
f0690a25
GR		 3755 tcpm_set_state(port, SNK_TRYWAIT_DEBOUNCE, 0);
3756 break;
af450ebb
BJS		 3757 case SNK_TRYWAIT:
3758 /* Do nothing, waiting for tCCDebounce */
3759 break;
f0690a25
GR		 3760 case PR_SWAP_SNK_SRC_SINK_OFF:
3761 case PR_SWAP_SRC_SNK_TRANSITION_OFF:
3762 case PR_SWAP_SRC_SNK_SOURCE_OFF:
b965b631
BJS		 3763 case PR_SWAP_SRC_SNK_SOURCE_OFF_CC_DEBOUNCED:
3764 case PR_SWAP_SNK_SRC_SOURCE_ON:
f0690a25 3765 /*
b965b631 3766 * CC state change is expected in PR_SWAP
f0690a25
GR		 3767 * Ignore it.
3768 */
3769 break;
3770
3771 default:
3772 if (tcpm_port_is_disconnected(port))
3773 tcpm_set_state(port, unattached_state(port), 0);
3774 break;
3775 }
3776}
3777
3778static void _tcpm_pd_vbus_on(struct tcpm_port *port)
3779{
f0690a25
GR		 3780 tcpm_log_force(port, "VBUS on");
3781 port->vbus_present = true;
3782 switch (port->state) {
3783 case SNK_TRANSITION_SINK_VBUS:
8bf05746 3784 port->explicit_contract = true;
f0690a25
GR		 3785 tcpm_set_state(port, SNK_READY, 0);
3786 break;
3787 case SNK_DISCOVERY:
3788 tcpm_set_state(port, SNK_DISCOVERY, 0);
3789 break;
3790
3791 case SNK_DEBOUNCED:
3792 tcpm_set_state(port, tcpm_try_src(port) ? SRC_TRY
3793 : SNK_ATTACHED,
3794 0);
3795 break;
3796 case SNK_HARD_RESET_WAIT_VBUS:
3797 tcpm_set_state(port, SNK_HARD_RESET_SINK_ON, 0);
3798 break;
3799 case SRC_ATTACHED:
3800 tcpm_set_state(port, SRC_STARTUP, 0);
3801 break;
3802 case SRC_HARD_RESET_VBUS_ON:
3803 tcpm_set_state(port, SRC_STARTUP, 0);
3804 break;
3805
3806 case SNK_TRY:
3807 /* Do nothing, waiting for timeout */
3808 break;
3809 case SRC_TRYWAIT:
02d5be46
BJS		 3810 /* Do nothing, Waiting for Rd to be detected */
3811 break;
3812 case SRC_TRYWAIT_DEBOUNCE:
3813 tcpm_set_state(port, SRC_TRYWAIT, 0);
f0690a25 3814 break;
a0a3e04e
BJS		 3815 case SNK_TRY_WAIT_DEBOUNCE:
3816 /* Do nothing, waiting for PD_DEBOUNCE to do be done */
f0690a25
GR		 3817 break;
3818 case SNK_TRYWAIT:
af450ebb
BJS		 3819 /* Do nothing, waiting for tCCDebounce */
3820 break;
3821 case SNK_TRYWAIT_VBUS:
3822 if (tcpm_port_is_sink(port))
3823 tcpm_set_state(port, SNK_ATTACHED, 0);
3824 break;
3825 case SNK_TRYWAIT_DEBOUNCE:
3826 /* Do nothing, waiting for Rp */
f0690a25 3827 break;
131c7d12
BJS		 3828 case SRC_TRY_WAIT:
3829 case SRC_TRY_DEBOUNCE:
3830 /* Do nothing, waiting for sink detection */
3831 break;
f0690a25
GR		 3832 default:
3833 break;
3834 }
3835}
3836
3837static void _tcpm_pd_vbus_off(struct tcpm_port *port)
3838{
f0690a25
GR		 3839 tcpm_log_force(port, "VBUS off");
3840 port->vbus_present = false;
3841 port->vbus_never_low = false;
3842 switch (port->state) {
3843 case SNK_HARD_RESET_SINK_OFF:
3844 tcpm_set_state(port, SNK_HARD_RESET_WAIT_VBUS, 0);
3845 break;
3846 case SRC_HARD_RESET_VBUS_OFF:
3847 tcpm_set_state(port, SRC_HARD_RESET_VBUS_ON, 0);
3848 break;
3849 case HARD_RESET_SEND:
3850 break;
3851
3852 case SNK_TRY:
3853 /* Do nothing, waiting for timeout */
3854 break;
3855 case SRC_TRYWAIT:
3856 /* Hand over to state machine if needed */
3857 if (tcpm_port_is_source(port))
02d5be46 3858 tcpm_set_state(port, SRC_TRYWAIT_DEBOUNCE, 0);
f0690a25 3859 break;
a0a3e04e
BJS		 3860 case SNK_TRY_WAIT_DEBOUNCE:
3861 /* Do nothing, waiting for PD_DEBOUNCE to do be done */
f0690a25 3862 break;
af450ebb 3863 case SNK_TRYWAIT:
f0690a25 3864 case SNK_TRYWAIT_VBUS:
af450ebb 3865 case SNK_TRYWAIT_DEBOUNCE:
f0690a25 3866 break;
f0690a25
GR		 3867 case SNK_ATTACH_WAIT:
3868 tcpm_set_state(port, SNK_UNATTACHED, 0);
3869 break;
3870
3871 case SNK_NEGOTIATE_CAPABILITIES:
3872 break;
3873
3874 case PR_SWAP_SRC_SNK_TRANSITION_OFF:
3875 tcpm_set_state(port, PR_SWAP_SRC_SNK_SOURCE_OFF, 0);
3876 break;
3877
3878 case PR_SWAP_SNK_SRC_SINK_OFF:
3879 /* Do nothing, expected */
3880 break;
3881
b17dd571 3882 case PORT_RESET_WAIT_OFF:
c749d4d0 3883 tcpm_set_state(port, tcpm_default_state(port), 0);
f0690a25 3884 break;
131c7d12
BJS		 3885 case SRC_TRY_WAIT:
3886 case SRC_TRY_DEBOUNCE:
3887 /* Do nothing, waiting for sink detection */
3888 break;
f0690a25
GR		 3889 default:
3890 if (port->pwr_role == TYPEC_SINK &&
3891 port->attached)
3892 tcpm_set_state(port, SNK_UNATTACHED, 0);
3893 break;
3894 }
3895}
3896
3897static void _tcpm_pd_hard_reset(struct tcpm_port *port)
3898{
3899 tcpm_log_force(port, "Received hard reset");
3900 /*
3901 * If we keep receiving hard reset requests, executing the hard reset
3902 * must have failed. Revert to error recovery if that happens.
3903 */
3904 tcpm_set_state(port,
3905 port->hard_reset_count < PD_N_HARD_RESET_COUNT ?
3906 HARD_RESET_START : ERROR_RECOVERY,
3907 0);
3908}
3909
3910static void tcpm_pd_event_handler(struct work_struct *work)
3911{
3912 struct tcpm_port *port = container_of(work, struct tcpm_port,
3913 event_work);
3914 u32 events;
3915
3916 mutex_lock(&port->lock);
3917
3918 spin_lock(&port->pd_event_lock);
3919 while (port->pd_events) {
3920 events = port->pd_events;
3921 port->pd_events = 0;
3922 spin_unlock(&port->pd_event_lock);
3923 if (events & TCPM_RESET_EVENT)
3924 _tcpm_pd_hard_reset(port);
3925 if (events & TCPM_VBUS_EVENT) {
3926 bool vbus;
3927
3928 vbus = port->tcpc->get_vbus(port->tcpc);
3929 if (vbus)
3930 _tcpm_pd_vbus_on(port);
3931 else
3932 _tcpm_pd_vbus_off(port);
3933 }
3934 if (events & TCPM_CC_EVENT) {
3935 enum typec_cc_status cc1, cc2;
3936
3937 if (port->tcpc->get_cc(port->tcpc, &cc1, &cc2) == 0)
3938 _tcpm_cc_change(port, cc1, cc2);
3939 }
3940 spin_lock(&port->pd_event_lock);
3941 }
3942 spin_unlock(&port->pd_event_lock);
3943 mutex_unlock(&port->lock);
3944}
3945
3946void tcpm_cc_change(struct tcpm_port *port)
3947{
3948 spin_lock(&port->pd_event_lock);
3949 port->pd_events |= TCPM_CC_EVENT;
3950 spin_unlock(&port->pd_event_lock);
3951 queue_work(port->wq, &port->event_work);
3952}
3953EXPORT_SYMBOL_GPL(tcpm_cc_change);
3954
3955void tcpm_vbus_change(struct tcpm_port *port)
3956{
3957 spin_lock(&port->pd_event_lock);
3958 port->pd_events |= TCPM_VBUS_EVENT;
3959 spin_unlock(&port->pd_event_lock);
3960 queue_work(port->wq, &port->event_work);
3961}
3962EXPORT_SYMBOL_GPL(tcpm_vbus_change);
3963
3964void tcpm_pd_hard_reset(struct tcpm_port *port)
3965{
3966 spin_lock(&port->pd_event_lock);
3967 port->pd_events = TCPM_RESET_EVENT;
3968 spin_unlock(&port->pd_event_lock);
3969 queue_work(port->wq, &port->event_work);
3970}
3971EXPORT_SYMBOL_GPL(tcpm_pd_hard_reset);
3972
3973static int tcpm_dr_set(const struct typec_capability *cap,
3974 enum typec_data_role data)
3975{
3976 struct tcpm_port *port = typec_cap_to_tcpm(cap);
3977 int ret;
3978
3979 mutex_lock(&port->swap_lock);
3980 mutex_lock(&port->lock);
3981
9b0ae699 3982 if (port->port_type != TYPEC_PORT_DRP) {
f0690a25
GR		 3983 ret = -EINVAL;
3984 goto port_unlock;
3985 }
3986 if (port->state != SRC_READY && port->state != SNK_READY) {
3987 ret = -EAGAIN;
3988 goto port_unlock;
3989 }
3990
3991 if (port->data_role == data) {
3992 ret = 0;
3993 goto port_unlock;
3994 }
3995
3996 /*
3997 * XXX
3998 * 6.3.9: If an alternate mode is active, a request to swap
3999 * alternate modes shall trigger a port reset.
4000 * Reject data role swap request in this case.
4001 */
4002
b17dd571
GR		 4003 if (!port->pd_capable) {
4004 /*
4005 * If the partner is not PD capable, reset the port to
4006 * trigger a role change. This can only work if a preferred
4007 * role is configured, and if it matches the requested role.
4008 */
4009 if (port->try_role == TYPEC_NO_PREFERRED_ROLE ||
4010 port->try_role == port->pwr_role) {
4011 ret = -EINVAL;
4012 goto port_unlock;
4013 }
4014 port->non_pd_role_swap = true;
4015 tcpm_set_state(port, PORT_RESET, 0);
4016 } else {
4017 tcpm_set_state(port, DR_SWAP_SEND, 0);
4018 }
4019
f0690a25
GR		 4020 port->swap_status = 0;
4021 port->swap_pending = true;
4022 reinit_completion(&port->swap_complete);
f0690a25
GR		 4023 mutex_unlock(&port->lock);
4024
9adf9f9e
GR		 4025 if (!wait_for_completion_timeout(&port->swap_complete,
4026 msecs_to_jiffies(PD_ROLE_SWAP_TIMEOUT)))
4027 ret = -ETIMEDOUT;
4028 else
4029 ret = port->swap_status;
f0690a25 4030
b17dd571 4031 port->non_pd_role_swap = false;
f0690a25
GR		 4032 goto swap_unlock;
4033
4034port_unlock:
4035 mutex_unlock(&port->lock);
4036swap_unlock:
4037 mutex_unlock(&port->swap_lock);
4038 return ret;
4039}
4040
4041static int tcpm_pr_set(const struct typec_capability *cap,
4042 enum typec_role role)
4043{
4044 struct tcpm_port *port = typec_cap_to_tcpm(cap);
4045 int ret;
4046
4047 mutex_lock(&port->swap_lock);
4048 mutex_lock(&port->lock);
4049
9b0ae699 4050 if (port->port_type != TYPEC_PORT_DRP) {
f0690a25
GR		 4051 ret = -EINVAL;
4052 goto port_unlock;
4053 }
4054 if (port->state != SRC_READY && port->state != SNK_READY) {
4055 ret = -EAGAIN;
4056 goto port_unlock;
4057 }
4058
4059 if (role == port->pwr_role) {
4060 ret = 0;
4061 goto port_unlock;
4062 }
4063
f0690a25
GR		 4064 port->swap_status = 0;
4065 port->swap_pending = true;
4066 reinit_completion(&port->swap_complete);
4067 tcpm_set_state(port, PR_SWAP_SEND, 0);
4068 mutex_unlock(&port->lock);
4069
9adf9f9e
GR		 4070 if (!wait_for_completion_timeout(&port->swap_complete,
4071 msecs_to_jiffies(PD_ROLE_SWAP_TIMEOUT)))
4072 ret = -ETIMEDOUT;
4073 else
4074 ret = port->swap_status;
f0690a25 4075
f0690a25
GR		 4076 goto swap_unlock;
4077
4078port_unlock:
4079 mutex_unlock(&port->lock);
4080swap_unlock:
4081 mutex_unlock(&port->swap_lock);
4082 return ret;
4083}
4084
4085static int tcpm_vconn_set(const struct typec_capability *cap,
4086 enum typec_role role)
4087{
4088 struct tcpm_port *port = typec_cap_to_tcpm(cap);
4089 int ret;
4090
4091 mutex_lock(&port->swap_lock);
4092 mutex_lock(&port->lock);
4093
4094 if (port->state != SRC_READY && port->state != SNK_READY) {
4095 ret = -EAGAIN;
4096 goto port_unlock;
4097 }
4098
4099 if (role == port->vconn_role) {
4100 ret = 0;
4101 goto port_unlock;
4102 }
4103
4104 port->swap_status = 0;
4105 port->swap_pending = true;
4106 reinit_completion(&port->swap_complete);
4107 tcpm_set_state(port, VCONN_SWAP_SEND, 0);
4108 mutex_unlock(&port->lock);
4109
9adf9f9e
GR		 4110 if (!wait_for_completion_timeout(&port->swap_complete,
4111 msecs_to_jiffies(PD_ROLE_SWAP_TIMEOUT)))
4112 ret = -ETIMEDOUT;
4113 else
4114 ret = port->swap_status;
f0690a25 4115
f0690a25
GR		 4116 goto swap_unlock;
4117
4118port_unlock:
4119 mutex_unlock(&port->lock);
4120swap_unlock:
4121 mutex_unlock(&port->swap_lock);
4122 return ret;
4123}
4124
4125static int tcpm_try_role(const struct typec_capability *cap, int role)
4126{
4127 struct tcpm_port *port = typec_cap_to_tcpm(cap);
4128 struct tcpc_dev *tcpc = port->tcpc;
4129 int ret = 0;
4130
4131 mutex_lock(&port->lock);
4132 if (tcpc->try_role)
4133 ret = tcpc->try_role(tcpc, role);
1957de95 4134 if (!ret && (!tcpc->config || !tcpc->config->try_role_hw))
f0690a25
GR		 4135 port->try_role = role;
4136 port->try_src_count = 0;
4137 port->try_snk_count = 0;
4138 mutex_unlock(&port->lock);
4139
4140 return ret;
4141}
4142
f2a8aa05 4143static int tcpm_pps_set_op_curr(struct tcpm_port *port, u16 op_curr)
2eadc33f
AT		 4144{
4145 unsigned int target_mw;
4146 int ret;
4147
4148 mutex_lock(&port->swap_lock);
4149 mutex_lock(&port->lock);
4150
4151 if (!port->pps_data.active) {
4152 ret = -EOPNOTSUPP;
4153 goto port_unlock;
4154 }
4155
4156 if (port->state != SNK_READY) {
4157 ret = -EAGAIN;
4158 goto port_unlock;
4159 }
4160
4161 if (op_curr > port->pps_data.max_curr) {
4162 ret = -EINVAL;
4163 goto port_unlock;
4164 }
4165
4166 target_mw = (op_curr * port->pps_data.out_volt) / 1000;
4167 if (target_mw < port->operating_snk_mw) {
4168 ret = -EINVAL;
4169 goto port_unlock;
4170 }
4171
554fab6d
AT		 4172 /* Round down operating current to align with PPS valid steps */
4173 op_curr = op_curr - (op_curr % RDO_PROG_CURR_MA_STEP);
4174
2eadc33f
AT		 4175 reinit_completion(&port->pps_complete);
4176 port->pps_data.op_curr = op_curr;
4177 port->pps_status = 0;
4178 port->pps_pending = true;
4179 tcpm_set_state(port, SNK_NEGOTIATE_PPS_CAPABILITIES, 0);
4180 mutex_unlock(&port->lock);
4181
4182 if (!wait_for_completion_timeout(&port->pps_complete,
4183 msecs_to_jiffies(PD_PPS_CTRL_TIMEOUT)))
4184 ret = -ETIMEDOUT;
4185 else
4186 ret = port->pps_status;
4187
4188 goto swap_unlock;
4189
4190port_unlock:
4191 mutex_unlock(&port->lock);
4192swap_unlock:
4193 mutex_unlock(&port->swap_lock);
4194
4195 return ret;
4196}
4197
f2a8aa05 4198static int tcpm_pps_set_out_volt(struct tcpm_port *port, u16 out_volt)
2eadc33f
AT		 4199{
4200 unsigned int target_mw;
4201 int ret;
4202
4203 mutex_lock(&port->swap_lock);
4204 mutex_lock(&port->lock);
4205
4206 if (!port->pps_data.active) {
4207 ret = -EOPNOTSUPP;
4208 goto port_unlock;
4209 }
4210
4211 if (port->state != SNK_READY) {
4212 ret = -EAGAIN;
4213 goto port_unlock;
4214 }
4215
4216 if (out_volt < port->pps_data.min_volt ||
4217 out_volt > port->pps_data.max_volt) {
4218 ret = -EINVAL;
4219 goto port_unlock;
4220 }
4221
4222 target_mw = (port->pps_data.op_curr * out_volt) / 1000;
4223 if (target_mw < port->operating_snk_mw) {
4224 ret = -EINVAL;
4225 goto port_unlock;
4226 }
4227
554fab6d
AT		 4228 /* Round down output voltage to align with PPS valid steps */
4229 out_volt = out_volt - (out_volt % RDO_PROG_VOLT_MV_STEP);
4230
2eadc33f
AT		 4231 reinit_completion(&port->pps_complete);
4232 port->pps_data.out_volt = out_volt;
4233 port->pps_status = 0;
4234 port->pps_pending = true;
4235 tcpm_set_state(port, SNK_NEGOTIATE_PPS_CAPABILITIES, 0);
4236 mutex_unlock(&port->lock);
4237
4238 if (!wait_for_completion_timeout(&port->pps_complete,
4239 msecs_to_jiffies(PD_PPS_CTRL_TIMEOUT)))
4240 ret = -ETIMEDOUT;
4241 else
4242 ret = port->pps_status;
4243
4244 goto swap_unlock;
4245
4246port_unlock:
4247 mutex_unlock(&port->lock);
4248swap_unlock:
4249 mutex_unlock(&port->swap_lock);
4250
4251 return ret;
4252}
4253
f2a8aa05 4254static int tcpm_pps_activate(struct tcpm_port *port, bool activate)
2eadc33f
AT		 4255{
4256 int ret = 0;
4257
4258 mutex_lock(&port->swap_lock);
4259 mutex_lock(&port->lock);
4260
4261 if (!port->pps_data.supported) {
4262 ret = -EOPNOTSUPP;
4263 goto port_unlock;
4264 }
4265
4266 /* Trying to deactivate PPS when already deactivated so just bail */
4267 if (!port->pps_data.active && !activate)
4268 goto port_unlock;
4269
4270 if (port->state != SNK_READY) {
4271 ret = -EAGAIN;
4272 goto port_unlock;
4273 }
4274
4275 reinit_completion(&port->pps_complete);
4276 port->pps_status = 0;
4277 port->pps_pending = true;
4278
4279 /* Trigger PPS request or move back to standard PDO contract */
4280 if (activate) {
4281 port->pps_data.out_volt = port->supply_voltage;
4282 port->pps_data.op_curr = port->current_limit;
4283 tcpm_set_state(port, SNK_NEGOTIATE_PPS_CAPABILITIES, 0);
4284 } else {
4285 tcpm_set_state(port, SNK_NEGOTIATE_CAPABILITIES, 0);
4286 }
4287 mutex_unlock(&port->lock);
4288
4289 if (!wait_for_completion_timeout(&port->pps_complete,
4290 msecs_to_jiffies(PD_PPS_CTRL_TIMEOUT)))
4291 ret = -ETIMEDOUT;
4292 else
4293 ret = port->pps_status;
4294
4295 goto swap_unlock;
4296
4297port_unlock:
4298 mutex_unlock(&port->lock);
4299swap_unlock:
4300 mutex_unlock(&port->swap_lock);
4301
4302 return ret;
4303}
4304
f0690a25
GR		 4305static void tcpm_init(struct tcpm_port *port)
4306{
4307 enum typec_cc_status cc1, cc2;
4308
4309 port->tcpc->init(port->tcpc);
4310
4311 tcpm_reset_port(port);
4312
4313 /*
4314 * XXX
4315 * Should possibly wait for VBUS to settle if it was enabled locally
4316 * since tcpm_reset_port() will disable VBUS.
4317 */
4318 port->vbus_present = port->tcpc->get_vbus(port->tcpc);
4319 if (port->vbus_present)
4320 port->vbus_never_low = true;
4321
4322 tcpm_set_state(port, tcpm_default_state(port), 0);
4323
4324 if (port->tcpc->get_cc(port->tcpc, &cc1, &cc2) == 0)
4325 _tcpm_cc_change(port, cc1, cc2);
4326
4327 /*
4328 * Some adapters need a clean slate at startup, and won't recover
4329 * otherwise. So do not try to be fancy and force a clean disconnect.
4330 */
b17dd571 4331 tcpm_set_state(port, PORT_RESET, 0);
f0690a25
GR		 4332}
4333
9b0ae699
BJS		 4334static int tcpm_port_type_set(const struct typec_capability *cap,
4335 enum typec_port_type type)
4336{
4337 struct tcpm_port *port = typec_cap_to_tcpm(cap);
4338
4339 mutex_lock(&port->lock);
4340 if (type == port->port_type)
4341 goto port_unlock;
4342
4343 port->port_type = type;
4344
4345 if (!port->connected) {
4346 tcpm_set_state(port, PORT_RESET, 0);
ceeb1625 4347 } else if (type == TYPEC_PORT_SNK) {
9b0ae699
BJS		 4348 if (!(port->pwr_role == TYPEC_SINK &&
4349 port->data_role == TYPEC_DEVICE))
4350 tcpm_set_state(port, PORT_RESET, 0);
ceeb1625 4351 } else if (type == TYPEC_PORT_SRC) {
9b0ae699
BJS		 4352 if (!(port->pwr_role == TYPEC_SOURCE &&
4353 port->data_role == TYPEC_HOST))
4354 tcpm_set_state(port, PORT_RESET, 0);
4355 }
4356
4357port_unlock:
4358 mutex_unlock(&port->lock);
4359 return 0;
4360}
4361
f0690a25
GR		 4362void tcpm_tcpc_reset(struct tcpm_port *port)
4363{
4364 mutex_lock(&port->lock);
4365 /* XXX: Maintain PD connection if possible? */
4366 tcpm_init(port);
4367 mutex_unlock(&port->lock);
4368}
4369EXPORT_SYMBOL_GPL(tcpm_tcpc_reset);
4370
4371static int tcpm_copy_pdos(u32 *dest_pdo, const u32 *src_pdo,
4372 unsigned int nr_pdo)
4373{
4374 unsigned int i;
4375
4376 if (nr_pdo > PDO_MAX_OBJECTS)
4377 nr_pdo = PDO_MAX_OBJECTS;
4378
4379 for (i = 0; i < nr_pdo; i++)
4380 dest_pdo[i] = src_pdo[i];
4381
4382 return nr_pdo;
4383}
4384
193a6801
GR		 4385static int tcpm_copy_vdos(u32 *dest_vdo, const u32 *src_vdo,
4386 unsigned int nr_vdo)
4387{
4388 unsigned int i;
4389
4390 if (nr_vdo > VDO_MAX_OBJECTS)
4391 nr_vdo = VDO_MAX_OBJECTS;
4392
4393 for (i = 0; i < nr_vdo; i++)
4394 dest_vdo[i] = src_vdo[i];
4395
4396 return nr_vdo;
4397}
4398
96232cbc
LJ		 4399static int tcpm_fw_get_caps(struct tcpm_port *port,
4400 struct fwnode_handle *fwnode)
4401{
4402 const char *cap_str;
4403 int ret;
4404 u32 mw;
4405
4406 if (!fwnode)
4407 return -EINVAL;
4408
4409 /* USB data support is optional */
4410 ret = fwnode_property_read_string(fwnode, "data-role", &cap_str);
4411 if (ret == 0) {
4412 port->typec_caps.data = typec_find_port_data_role(cap_str);
4413 if (port->typec_caps.data < 0)
4414 return -EINVAL;
4415 }
4416
4417 ret = fwnode_property_read_string(fwnode, "power-role", &cap_str);
4418 if (ret < 0)
4419 return ret;
4420
4421 port->typec_caps.type = typec_find_port_power_role(cap_str);
4422 if (port->typec_caps.type < 0)
4423 return -EINVAL;
4424 port->port_type = port->typec_caps.type;
4425
4426 if (port->port_type == TYPEC_PORT_SNK)
4427 goto sink;
4428
4429 /* Get source pdos */
bc751492 4430 ret = fwnode_property_count_u32(fwnode, "source-pdos");
96232cbc
LJ		 4431 if (ret <= 0)
4432 return -EINVAL;
4433
4434 port->nr_src_pdo = min(ret, PDO_MAX_OBJECTS);
4435 ret = fwnode_property_read_u32_array(fwnode, "source-pdos",
4436 port->src_pdo, port->nr_src_pdo);
4437 if ((ret < 0) || tcpm_validate_caps(port, port->src_pdo,
4438 port->nr_src_pdo))
4439 return -EINVAL;
4440
4441 if (port->port_type == TYPEC_PORT_SRC)
4442 return 0;
4443
4444 /* Get the preferred power role for DRP */
4445 ret = fwnode_property_read_string(fwnode, "try-power-role", &cap_str);
4446 if (ret < 0)
4447 return ret;
4448
4449 port->typec_caps.prefer_role = typec_find_power_role(cap_str);
4450 if (port->typec_caps.prefer_role < 0)
4451 return -EINVAL;
4452sink:
4453 /* Get sink pdos */
bc751492 4454 ret = fwnode_property_count_u32(fwnode, "sink-pdos");
96232cbc
LJ		 4455 if (ret <= 0)
4456 return -EINVAL;
4457
4458 port->nr_snk_pdo = min(ret, PDO_MAX_OBJECTS);
4459 ret = fwnode_property_read_u32_array(fwnode, "sink-pdos",
4460 port->snk_pdo, port->nr_snk_pdo);
4461 if ((ret < 0) || tcpm_validate_caps(port, port->snk_pdo,
4462 port->nr_snk_pdo))
4463 return -EINVAL;
4464
4465 if (fwnode_property_read_u32(fwnode, "op-sink-microwatt", &mw) < 0)
4466 return -EINVAL;
4467 port->operating_snk_mw = mw / 1000;
4468
23b5f732
BJS		 4469 port->self_powered = fwnode_property_read_bool(fwnode, "self-powered");
4470
96232cbc
LJ		 4471 return 0;
4472}
4473
f2a8aa05
AT		 4474/* Power Supply access to expose source power information */
4475enum tcpm_psy_online_states {
4476 TCPM_PSY_OFFLINE = 0,
4477 TCPM_PSY_FIXED_ONLINE,
4478 TCPM_PSY_PROG_ONLINE,
4479};
4480
4481static enum power_supply_property tcpm_psy_props[] = {
4482 POWER_SUPPLY_PROP_USB_TYPE,
4483 POWER_SUPPLY_PROP_ONLINE,
4484 POWER_SUPPLY_PROP_VOLTAGE_MIN,
4485 POWER_SUPPLY_PROP_VOLTAGE_MAX,
4486 POWER_SUPPLY_PROP_VOLTAGE_NOW,
4487 POWER_SUPPLY_PROP_CURRENT_MAX,
4488 POWER_SUPPLY_PROP_CURRENT_NOW,
4489};
4490
4491static int tcpm_psy_get_online(struct tcpm_port *port,
4492 union power_supply_propval *val)
4493{
4494 if (port->vbus_charge) {
4495 if (port->pps_data.active)
4496 val->intval = TCPM_PSY_PROG_ONLINE;
4497 else
4498 val->intval = TCPM_PSY_FIXED_ONLINE;
4499 } else {
4500 val->intval = TCPM_PSY_OFFLINE;
4501 }
4502
4503 return 0;
4504}
4505
4506static int tcpm_psy_get_voltage_min(struct tcpm_port *port,
4507 union power_supply_propval *val)
4508{
4509 if (port->pps_data.active)
4510 val->intval = port->pps_data.min_volt * 1000;
4511 else
4512 val->intval = port->supply_voltage * 1000;
4513
4514 return 0;
4515}
4516
4517static int tcpm_psy_get_voltage_max(struct tcpm_port *port,
4518 union power_supply_propval *val)
4519{
4520 if (port->pps_data.active)
4521 val->intval = port->pps_data.max_volt * 1000;
4522 else
4523 val->intval = port->supply_voltage * 1000;
4524
4525 return 0;
4526}
4527
4528static int tcpm_psy_get_voltage_now(struct tcpm_port *port,
4529 union power_supply_propval *val)
4530{
4531 val->intval = port->supply_voltage * 1000;
4532
4533 return 0;
4534}
4535
4536static int tcpm_psy_get_current_max(struct tcpm_port *port,
4537 union power_supply_propval *val)
4538{
4539 if (port->pps_data.active)
4540 val->intval = port->pps_data.max_curr * 1000;
4541 else
4542 val->intval = port->current_limit * 1000;
4543
4544 return 0;
4545}
4546
4547static int tcpm_psy_get_current_now(struct tcpm_port *port,
4548 union power_supply_propval *val)
4549{
4550 val->intval = port->current_limit * 1000;
4551
4552 return 0;
4553}
4554
4555static int tcpm_psy_get_prop(struct power_supply *psy,
4556 enum power_supply_property psp,
4557 union power_supply_propval *val)
4558{
4559 struct tcpm_port *port = power_supply_get_drvdata(psy);
4560 int ret = 0;
4561
4562 switch (psp) {
4563 case POWER_SUPPLY_PROP_USB_TYPE:
4564 val->intval = port->usb_type;
4565 break;
4566 case POWER_SUPPLY_PROP_ONLINE:
4567 ret = tcpm_psy_get_online(port, val);
4568 break;
4569 case POWER_SUPPLY_PROP_VOLTAGE_MIN:
4570 ret = tcpm_psy_get_voltage_min(port, val);
4571 break;
4572 case POWER_SUPPLY_PROP_VOLTAGE_MAX:
4573 ret = tcpm_psy_get_voltage_max(port, val);
4574 break;
4575 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
4576 ret = tcpm_psy_get_voltage_now(port, val);
4577 break;
4578 case POWER_SUPPLY_PROP_CURRENT_MAX:
4579 ret = tcpm_psy_get_current_max(port, val);
4580 break;
4581 case POWER_SUPPLY_PROP_CURRENT_NOW:
4582 ret = tcpm_psy_get_current_now(port, val);
4583 break;
4584 default:
4585 ret = -EINVAL;
4586 break;
4587 }
4588
4589 return ret;
4590}
4591
4592static int tcpm_psy_set_online(struct tcpm_port *port,
4593 const union power_supply_propval *val)
4594{
4595 int ret;
4596
4597 switch (val->intval) {
4598 case TCPM_PSY_FIXED_ONLINE:
4599 ret = tcpm_pps_activate(port, false);
4600 break;
4601 case TCPM_PSY_PROG_ONLINE:
4602 ret = tcpm_pps_activate(port, true);
4603 break;
4604 default:
4605 ret = -EINVAL;
4606 break;
4607 }
4608
4609 return ret;
4610}
4611
4612static int tcpm_psy_set_prop(struct power_supply *psy,
4613 enum power_supply_property psp,
4614 const union power_supply_propval *val)
4615{
4616 struct tcpm_port *port = power_supply_get_drvdata(psy);
4617 int ret;
4618
4619 switch (psp) {
4620 case POWER_SUPPLY_PROP_ONLINE:
4621 ret = tcpm_psy_set_online(port, val);
4622 break;
4623 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
4624 if (val->intval < port->pps_data.min_volt * 1000 ||
4625 val->intval > port->pps_data.max_volt * 1000)
4626 ret = -EINVAL;
4627 else
4628 ret = tcpm_pps_set_out_volt(port, val->intval / 1000);
4629 break;
4630 case POWER_SUPPLY_PROP_CURRENT_NOW:
4631 if (val->intval > port->pps_data.max_curr * 1000)
4632 ret = -EINVAL;
4633 else
4634 ret = tcpm_pps_set_op_curr(port, val->intval / 1000);
4635 break;
4636 default:
4637 ret = -EINVAL;
4638 break;
4639 }
4640
4641 return ret;
4642}
4643
4644static int tcpm_psy_prop_writeable(struct power_supply *psy,
4645 enum power_supply_property psp)
4646{
4647 switch (psp) {
4648 case POWER_SUPPLY_PROP_ONLINE:
4649 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
4650 case POWER_SUPPLY_PROP_CURRENT_NOW:
4651 return 1;
4652 default:
4653 return 0;
4654 }
4655}
4656
4657static enum power_supply_usb_type tcpm_psy_usb_types[] = {
4658 POWER_SUPPLY_USB_TYPE_C,
4659 POWER_SUPPLY_USB_TYPE_PD,
4660 POWER_SUPPLY_USB_TYPE_PD_PPS,
4661};
4662
4663static const char *tcpm_psy_name_prefix = "tcpm-source-psy-";
4664
4665static int devm_tcpm_psy_register(struct tcpm_port *port)
4666{
4667 struct power_supply_config psy_cfg = {};
4668 const char *port_dev_name = dev_name(port->dev);
4669 size_t psy_name_len = strlen(tcpm_psy_name_prefix) +
4670 strlen(port_dev_name) + 1;
4671 char *psy_name;
4672
4673 psy_cfg.drv_data = port;
c97a8cc1 4674 psy_cfg.fwnode = dev_fwnode(port->dev);
f2a8aa05
AT		 4675 psy_name = devm_kzalloc(port->dev, psy_name_len, GFP_KERNEL);
4676 if (!psy_name)
4677 return -ENOMEM;
4678
4679 snprintf(psy_name, psy_name_len, "%s%s", tcpm_psy_name_prefix,
4680 port_dev_name);
4681 port->psy_desc.name = psy_name;
4682 port->psy_desc.type = POWER_SUPPLY_TYPE_USB,
4683 port->psy_desc.usb_types = tcpm_psy_usb_types;
4684 port->psy_desc.num_usb_types = ARRAY_SIZE(tcpm_psy_usb_types);
4685 port->psy_desc.properties = tcpm_psy_props,
4686 port->psy_desc.num_properties = ARRAY_SIZE(tcpm_psy_props),
4687 port->psy_desc.get_property = tcpm_psy_get_prop,
4688 port->psy_desc.set_property = tcpm_psy_set_prop,
4689 port->psy_desc.property_is_writeable = tcpm_psy_prop_writeable,
4690
4691 port->usb_type = POWER_SUPPLY_USB_TYPE_C;
4692
4693 port->psy = devm_power_supply_register(port->dev, &port->psy_desc,
4694 &psy_cfg);
4695
4696 return PTR_ERR_OR_ZERO(port->psy);
4697}
4698
96232cbc
LJ		 4699static int tcpm_copy_caps(struct tcpm_port *port,
4700 const struct tcpc_config *tcfg)
4701{
4702 if (tcpm_validate_caps(port, tcfg->src_pdo, tcfg->nr_src_pdo) ||
4703 tcpm_validate_caps(port, tcfg->snk_pdo, tcfg->nr_snk_pdo))
4704 return -EINVAL;
4705
4706 port->nr_src_pdo = tcpm_copy_pdos(port->src_pdo, tcfg->src_pdo,
4707 tcfg->nr_src_pdo);
4708 port->nr_snk_pdo = tcpm_copy_pdos(port->snk_pdo, tcfg->snk_pdo,
4709 tcfg->nr_snk_pdo);
4710
4711 port->nr_snk_vdo = tcpm_copy_vdos(port->snk_vdo, tcfg->snk_vdo,
4712 tcfg->nr_snk_vdo);
4713
4714 port->operating_snk_mw = tcfg->operating_snk_mw;
4715
4716 port->typec_caps.prefer_role = tcfg->default_role;
4717 port->typec_caps.type = tcfg->type;
4718 port->typec_caps.data = tcfg->data;
1957de95 4719 port->self_powered = tcfg->self_powered;
96232cbc
LJ		 4720
4721 return 0;
4722}
4723
f0690a25
GR		 4724struct tcpm_port *tcpm_register_port(struct device *dev, struct tcpc_dev *tcpc)
4725{
4726 struct tcpm_port *port;
4727 int i, err;
4728
96232cbc 4729 if (!dev || !tcpc ||
f0690a25
GR		 4730 !tcpc->get_vbus || !tcpc->set_cc || !tcpc->get_cc ||
4731 !tcpc->set_polarity || !tcpc->set_vconn || !tcpc->set_vbus ||
4732 !tcpc->set_pd_rx || !tcpc->set_roles || !tcpc->pd_transmit)
4733 return ERR_PTR(-EINVAL);
4734
4735 port = devm_kzalloc(dev, sizeof(*port), GFP_KERNEL);
4736 if (!port)
4737 return ERR_PTR(-ENOMEM);
4738
4739 port->dev = dev;
4740 port->tcpc = tcpc;
4741
4742 mutex_init(&port->lock);
4743 mutex_init(&port->swap_lock);
4744
4745 port->wq = create_singlethread_workqueue(dev_name(dev));
4746 if (!port->wq)
4747 return ERR_PTR(-ENOMEM);
4748 INIT_DELAYED_WORK(&port->state_machine, tcpm_state_machine_work);
4749 INIT_DELAYED_WORK(&port->vdm_state_machine, vdm_state_machine_work);
4750 INIT_WORK(&port->event_work, tcpm_pd_event_handler);
4751
4752 spin_lock_init(&port->pd_event_lock);
4753
4754 init_completion(&port->tx_complete);
4755 init_completion(&port->swap_complete);
2eadc33f 4756 init_completion(&port->pps_complete);
5007e1b5 4757 tcpm_debugfs_init(port);
f0690a25 4758
96232cbc
LJ		 4759 err = tcpm_fw_get_caps(port, tcpc->fwnode);
4760 if ((err < 0) && tcpc->config)
4761 err = tcpm_copy_caps(port, tcpc->config);
4762 if (err < 0)
5007e1b5 4763 goto out_destroy_wq;
96232cbc
LJ		 4764
4765 if (!tcpc->config || !tcpc->config->try_role_hw)
4766 port->try_role = port->typec_caps.prefer_role;
f0690a25
GR		 4767 else
4768 port->try_role = TYPEC_NO_PREFERRED_ROLE;
4769
5e85a04c 4770 port->typec_caps.fwnode = tcpc->fwnode;
f0690a25 4771 port->typec_caps.revision = 0x0120; /* Type-C spec release 1.2 */
2eadc33f 4772 port->typec_caps.pd_revision = 0x0300; /* USB-PD spec release 3.0 */
f0690a25
GR		 4773 port->typec_caps.dr_set = tcpm_dr_set;
4774 port->typec_caps.pr_set = tcpm_pr_set;
4775 port->typec_caps.vconn_set = tcpm_vconn_set;
4776 port->typec_caps.try_role = tcpm_try_role;
9b0ae699 4777 port->typec_caps.port_type_set = tcpm_port_type_set;
f0690a25
GR		 4778
4779 port->partner_desc.identity = &port->partner_ident;
96232cbc 4780 port->port_type = port->typec_caps.type;
f0690a25 4781
2000016c
HG		 4782 port->role_sw = usb_role_switch_get(port->dev);
4783 if (IS_ERR(port->role_sw)) {
4784 err = PTR_ERR(port->role_sw);
4785 goto out_destroy_wq;
4786 }
4787
f2a8aa05
AT		 4788 err = devm_tcpm_psy_register(port);
4789 if (err)
9997ab35 4790 goto out_role_sw_put;
f2a8aa05 4791
f0690a25 4792 port->typec_port = typec_register_port(port->dev, &port->typec_caps);
cf6e06cd
HK		 4793 if (IS_ERR(port->typec_port)) {
4794 err = PTR_ERR(port->typec_port);
9997ab35 4795 goto out_role_sw_put;
f0690a25
GR		 4796 }
4797
96232cbc 4798 if (tcpc->config && tcpc->config->alt_modes) {
3c41dbde 4799 const struct typec_altmode_desc *paltmode = tcpc->config->alt_modes;
f0690a25
GR		 4800
4801 i = 0;
4802 while (paltmode->svid && i < ARRAY_SIZE(port->port_altmode)) {
cf6e06cd
HK		 4803 struct typec_altmode *alt;
4804
4805 alt = typec_port_register_altmode(port->typec_port,
4806 paltmode);
4807 if (IS_ERR(alt)) {
f0690a25
GR		 4808 tcpm_log(port,
4809 "%s: failed to register port alternate mode 0x%x",
4810 dev_name(dev), paltmode->svid);
4811 break;
4812 }
e9576fe8
HK		 4813 typec_altmode_set_drvdata(alt, port);
4814 alt->ops = &tcpm_altmode_ops;
cf6e06cd 4815 port->port_altmode[i] = alt;
f0690a25
GR		 4816 i++;
4817 paltmode++;
4818 }
4819 }
4820
f0690a25
GR		 4821 mutex_lock(&port->lock);
4822 tcpm_init(port);
4823 mutex_unlock(&port->lock);
4824
4825 tcpm_log(port, "%s: registered", dev_name(dev));
4826 return port;
4827
9997ab35 4828out_role_sw_put:
2000016c 4829 usb_role_switch_put(port->role_sw);
9997ab35
JL		 4830out_destroy_wq:
4831 tcpm_debugfs_exit(port);
f0690a25
GR		 4832 destroy_workqueue(port->wq);
4833 return ERR_PTR(err);
4834}
4835EXPORT_SYMBOL_GPL(tcpm_register_port);
4836
4837void tcpm_unregister_port(struct tcpm_port *port)
4838{
4839 int i;
4840
a6d5d230 4841 tcpm_reset_port(port);
f0690a25
GR		 4842 for (i = 0; i < ARRAY_SIZE(port->port_altmode); i++)
4843 typec_unregister_altmode(port->port_altmode[i]);
4844 typec_unregister_port(port->typec_port);
5671a460 4845 usb_role_switch_put(port->role_sw);
f0690a25
GR		 4846 tcpm_debugfs_exit(port);
4847 destroy_workqueue(port->wq);
4848}
4849EXPORT_SYMBOL_GPL(tcpm_unregister_port);
4850
4851MODULE_AUTHOR("Guenter Roeck <groeck@chromium.org>");
4852MODULE_DESCRIPTION("USB Type-C Port Manager");
4853MODULE_LICENSE("GPL");
Linux 6.x block layer and io_uring tree(s)