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Merge branch 'for-5.4/apple' into for-linus
[linux-2.6-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>
4b4e02c8 22#include <linux/usb/pd.h>
64f7c494 23#include <linux/usb/pd_ado.h>
4b4e02c8 24#include <linux/usb/pd_bdo.h>
64f7c494 25#include <linux/usb/pd_ext_sdb.h>
4b4e02c8 26#include <linux/usb/pd_vdo.h>
2000016c 27#include <linux/usb/role.h>
4b4e02c8 28#include <linux/usb/tcpm.h>
e9576fe8 29#include <linux/usb/typec_altmode.h>
f0690a25
GR		 30#include <linux/workqueue.h>
31
f0690a25
GR		 32#define FOREACH_STATE(S) \
33 S(INVALID_STATE), \
7893f9e1 34 S(TOGGLING), \
f0690a25
GR		 35 S(SRC_UNATTACHED), \
36 S(SRC_ATTACH_WAIT), \
37 S(SRC_ATTACHED), \
38 S(SRC_STARTUP), \
39 S(SRC_SEND_CAPABILITIES), \
976daf9d 40 S(SRC_SEND_CAPABILITIES_TIMEOUT), \
f0690a25
GR		 41 S(SRC_NEGOTIATE_CAPABILITIES), \
42 S(SRC_TRANSITION_SUPPLY), \
43 S(SRC_READY), \
44 S(SRC_WAIT_NEW_CAPABILITIES), \
45 \
46 S(SNK_UNATTACHED), \
47 S(SNK_ATTACH_WAIT), \
48 S(SNK_DEBOUNCED), \
49 S(SNK_ATTACHED), \
50 S(SNK_STARTUP), \
51 S(SNK_DISCOVERY), \
52 S(SNK_DISCOVERY_DEBOUNCE), \
53 S(SNK_DISCOVERY_DEBOUNCE_DONE), \
54 S(SNK_WAIT_CAPABILITIES), \
55 S(SNK_NEGOTIATE_CAPABILITIES), \
2eadc33f 56 S(SNK_NEGOTIATE_PPS_CAPABILITIES), \
f0690a25
GR		 57 S(SNK_TRANSITION_SINK), \
58 S(SNK_TRANSITION_SINK_VBUS), \
59 S(SNK_READY), \
60 \
61 S(ACC_UNATTACHED), \
62 S(DEBUG_ACC_ATTACHED), \
63 S(AUDIO_ACC_ATTACHED), \
64 S(AUDIO_ACC_DEBOUNCE), \
65 \
66 S(HARD_RESET_SEND), \
67 S(HARD_RESET_START), \
68 S(SRC_HARD_RESET_VBUS_OFF), \
69 S(SRC_HARD_RESET_VBUS_ON), \
70 S(SNK_HARD_RESET_SINK_OFF), \
71 S(SNK_HARD_RESET_WAIT_VBUS), \
72 S(SNK_HARD_RESET_SINK_ON), \
73 \
74 S(SOFT_RESET), \
75 S(SOFT_RESET_SEND), \
76 \
77 S(DR_SWAP_ACCEPT), \
78 S(DR_SWAP_SEND), \
79 S(DR_SWAP_SEND_TIMEOUT), \
80 S(DR_SWAP_CANCEL), \
81 S(DR_SWAP_CHANGE_DR), \
82 \
83 S(PR_SWAP_ACCEPT), \
84 S(PR_SWAP_SEND), \
85 S(PR_SWAP_SEND_TIMEOUT), \
86 S(PR_SWAP_CANCEL), \
87 S(PR_SWAP_START), \
88 S(PR_SWAP_SRC_SNK_TRANSITION_OFF), \
89 S(PR_SWAP_SRC_SNK_SOURCE_OFF), \
b965b631 90 S(PR_SWAP_SRC_SNK_SOURCE_OFF_CC_DEBOUNCED), \
f0690a25
GR		 91 S(PR_SWAP_SRC_SNK_SINK_ON), \
92 S(PR_SWAP_SNK_SRC_SINK_OFF), \
93 S(PR_SWAP_SNK_SRC_SOURCE_ON), \
b965b631 94 S(PR_SWAP_SNK_SRC_SOURCE_ON_VBUS_RAMPED_UP), \
f0690a25
GR		 95 \
96 S(VCONN_SWAP_ACCEPT), \
97 S(VCONN_SWAP_SEND), \
98 S(VCONN_SWAP_SEND_TIMEOUT), \
99 S(VCONN_SWAP_CANCEL), \
100 S(VCONN_SWAP_START), \
101 S(VCONN_SWAP_WAIT_FOR_VCONN), \
102 S(VCONN_SWAP_TURN_ON_VCONN), \
103 S(VCONN_SWAP_TURN_OFF_VCONN), \
104 \
105 S(SNK_TRY), \
106 S(SNK_TRY_WAIT), \
a0a3e04e
BJS		 107 S(SNK_TRY_WAIT_DEBOUNCE), \
108 S(SNK_TRY_WAIT_DEBOUNCE_CHECK_VBUS), \
f0690a25 109 S(SRC_TRYWAIT), \
02d5be46 110 S(SRC_TRYWAIT_DEBOUNCE), \
f0690a25
GR		 111 S(SRC_TRYWAIT_UNATTACHED), \
112 \
113 S(SRC_TRY), \
131c7d12 114 S(SRC_TRY_WAIT), \
f0690a25
GR		 115 S(SRC_TRY_DEBOUNCE), \
116 S(SNK_TRYWAIT), \
117 S(SNK_TRYWAIT_DEBOUNCE), \
118 S(SNK_TRYWAIT_VBUS), \
119 S(BIST_RX), \
120 \
64f7c494
AT		 121 S(GET_STATUS_SEND), \
122 S(GET_STATUS_SEND_TIMEOUT), \
123 S(GET_PPS_STATUS_SEND), \
124 S(GET_PPS_STATUS_SEND_TIMEOUT), \
125 \
f0690a25 126 S(ERROR_RECOVERY), \
b17dd571
GR		 127 S(PORT_RESET), \
128 S(PORT_RESET_WAIT_OFF)
f0690a25
GR		 129
130#define GENERATE_ENUM(e) e
131#define GENERATE_STRING(s) #s
132
133enum tcpm_state {
134 FOREACH_STATE(GENERATE_ENUM)
135};
136
137static const char * const tcpm_states[] = {
138 FOREACH_STATE(GENERATE_STRING)
139};
140
141enum vdm_states {
142 VDM_STATE_ERR_BUSY = -3,
143 VDM_STATE_ERR_SEND = -2,
144 VDM_STATE_ERR_TMOUT = -1,
145 VDM_STATE_DONE = 0,
146 /* Anything >0 represents an active state */
147 VDM_STATE_READY = 1,
148 VDM_STATE_BUSY = 2,
149 VDM_STATE_WAIT_RSP_BUSY = 3,
150};
151
152enum pd_msg_request {
153 PD_MSG_NONE = 0,
154 PD_MSG_CTRL_REJECT,
155 PD_MSG_CTRL_WAIT,
64f7c494 156 PD_MSG_CTRL_NOT_SUPP,
f0690a25
GR		 157 PD_MSG_DATA_SINK_CAP,
158 PD_MSG_DATA_SOURCE_CAP,
159};
160
161/* Events from low level driver */
162
163#define TCPM_CC_EVENT BIT(0)
164#define TCPM_VBUS_EVENT BIT(1)
165#define TCPM_RESET_EVENT BIT(2)
166
167#define LOG_BUFFER_ENTRIES 1024
168#define LOG_BUFFER_ENTRY_SIZE 128
169
170/* Alternate mode support */
171
172#define SVID_DISCOVERY_MAX 16
e9576fe8 173#define ALTMODE_DISCOVERY_MAX (SVID_DISCOVERY_MAX * MODE_DISCOVERY_MAX)
f0690a25
GR		 174
175struct pd_mode_data {
176 int svid_index; /* current SVID index */
177 int nsvids;
178 u16 svids[SVID_DISCOVERY_MAX];
179 int altmodes; /* number of alternate modes */
e9576fe8 180 struct typec_altmode_desc altmode_desc[ALTMODE_DISCOVERY_MAX];
f0690a25
GR		 181};
182
2eadc33f
AT		 183struct pd_pps_data {
184 u32 min_volt;
185 u32 max_volt;
186 u32 max_curr;
187 u32 out_volt;
188 u32 op_curr;
189 bool supported;
190 bool active;
191};
192
f0690a25
GR		 193struct tcpm_port {
194 struct device *dev;
195
196 struct mutex lock; /* tcpm state machine lock */
197 struct workqueue_struct *wq;
198
199 struct typec_capability typec_caps;
200 struct typec_port *typec_port;
201
202 struct tcpc_dev *tcpc;
2000016c 203 struct usb_role_switch *role_sw;
f0690a25
GR		 204
205 enum typec_role vconn_role;
206 enum typec_role pwr_role;
207 enum typec_data_role data_role;
208 enum typec_pwr_opmode pwr_opmode;
209
210 struct usb_pd_identity partner_ident;
211 struct typec_partner_desc partner_desc;
212 struct typec_partner *partner;
213
214 enum typec_cc_status cc_req;
215
216 enum typec_cc_status cc1;
217 enum typec_cc_status cc2;
218 enum typec_cc_polarity polarity;
219
220 bool attached;
221 bool connected;
9b0ae699 222 enum typec_port_type port_type;
f0690a25
GR		 223 bool vbus_present;
224 bool vbus_never_low;
225 bool vbus_source;
226 bool vbus_charge;
227
228 bool send_discover;
229 bool op_vsafe5v;
230
231 int try_role;
232 int try_snk_count;
233 int try_src_count;
234
235 enum pd_msg_request queued_message;
236
237 enum tcpm_state enter_state;
238 enum tcpm_state prev_state;
239 enum tcpm_state state;
240 enum tcpm_state delayed_state;
241 unsigned long delayed_runtime;
242 unsigned long delay_ms;
243
244 spinlock_t pd_event_lock;
245 u32 pd_events;
246
247 struct work_struct event_work;
248 struct delayed_work state_machine;
249 struct delayed_work vdm_state_machine;
250 bool state_machine_running;
251
252 struct completion tx_complete;
253 enum tcpm_transmit_status tx_status;
254
255 struct mutex swap_lock; /* swap command lock */
256 bool swap_pending;
b17dd571 257 bool non_pd_role_swap;
f0690a25
GR		 258 struct completion swap_complete;
259 int swap_status;
260
2eadc33f 261 unsigned int negotiated_rev;
f0690a25
GR		 262 unsigned int message_id;
263 unsigned int caps_count;
264 unsigned int hard_reset_count;
265 bool pd_capable;
266 bool explicit_contract;
5fec4b54 267 unsigned int rx_msgid;
f0690a25
GR		 268
269 /* Partner capabilities/requests */
270 u32 sink_request;
271 u32 source_caps[PDO_MAX_OBJECTS];
272 unsigned int nr_source_caps;
273 u32 sink_caps[PDO_MAX_OBJECTS];
274 unsigned int nr_sink_caps;
275
276 /* Local capabilities */
277 u32 src_pdo[PDO_MAX_OBJECTS];
278 unsigned int nr_src_pdo;
279 u32 snk_pdo[PDO_MAX_OBJECTS];
280 unsigned int nr_snk_pdo;
193a6801
GR		 281 u32 snk_vdo[VDO_MAX_OBJECTS];
282 unsigned int nr_snk_vdo;
f0690a25 283
f0690a25 284 unsigned int operating_snk_mw;
2eadc33f 285 bool update_sink_caps;
f0690a25
GR		 286
287 /* Requested current / voltage */
288 u32 current_limit;
289 u32 supply_voltage;
290
f2a8aa05
AT		 291 /* Used to export TA voltage and current */
292 struct power_supply *psy;
293 struct power_supply_desc psy_desc;
294 enum power_supply_usb_type usb_type;
295
f0690a25
GR		 296 u32 bist_request;
297
298 /* PD state for Vendor Defined Messages */
299 enum vdm_states vdm_state;
300 u32 vdm_retries;
301 /* next Vendor Defined Message to send */
302 u32 vdo_data[VDO_MAX_SIZE];
303 u8 vdo_count;
304 /* VDO to retry if UFP responder replied busy */
305 u32 vdo_retry;
306
2eadc33f
AT		 307 /* PPS */
308 struct pd_pps_data pps_data;
309 struct completion pps_complete;
310 bool pps_pending;
311 int pps_status;
f0690a25 312
2eadc33f 313 /* Alternate mode data */
f0690a25 314 struct pd_mode_data mode_data;
e9576fe8
HK		 315 struct typec_altmode *partner_altmode[ALTMODE_DISCOVERY_MAX];
316 struct typec_altmode *port_altmode[ALTMODE_DISCOVERY_MAX];
f0690a25 317
02d5be46
BJS		 318 /* Deadline in jiffies to exit src_try_wait state */
319 unsigned long max_wait;
320
23b5f732
BJS		 321 /* port belongs to a self powered device */
322 bool self_powered;
323
f0690a25
GR		 324#ifdef CONFIG_DEBUG_FS
325 struct dentry *dentry;
326 struct mutex logbuffer_lock; /* log buffer access lock */
327 int logbuffer_head;
328 int logbuffer_tail;
329 u8 *logbuffer[LOG_BUFFER_ENTRIES];
330#endif
331};
332
333struct pd_rx_event {
334 struct work_struct work;
335 struct tcpm_port *port;
336 struct pd_message msg;
337};
338
339#define tcpm_cc_is_sink(cc) \
340 ((cc) == TYPEC_CC_RP_DEF || (cc) == TYPEC_CC_RP_1_5 || \
341 (cc) == TYPEC_CC_RP_3_0)
342
343#define tcpm_port_is_sink(port) \
344 ((tcpm_cc_is_sink((port)->cc1) && !tcpm_cc_is_sink((port)->cc2)) || \
345 (tcpm_cc_is_sink((port)->cc2) && !tcpm_cc_is_sink((port)->cc1)))
346
347#define tcpm_cc_is_source(cc) ((cc) == TYPEC_CC_RD)
348#define tcpm_cc_is_audio(cc) ((cc) == TYPEC_CC_RA)
349#define tcpm_cc_is_open(cc) ((cc) == TYPEC_CC_OPEN)
350
351#define tcpm_port_is_source(port) \
352 ((tcpm_cc_is_source((port)->cc1) && \
353 !tcpm_cc_is_source((port)->cc2)) || \
354 (tcpm_cc_is_source((port)->cc2) && \
355 !tcpm_cc_is_source((port)->cc1)))
356
357#define tcpm_port_is_debug(port) \
358 (tcpm_cc_is_source((port)->cc1) && tcpm_cc_is_source((port)->cc2))
359
360#define tcpm_port_is_audio(port) \
361 (tcpm_cc_is_audio((port)->cc1) && tcpm_cc_is_audio((port)->cc2))
362
363#define tcpm_port_is_audio_detached(port) \
364 ((tcpm_cc_is_audio((port)->cc1) && tcpm_cc_is_open((port)->cc2)) || \
365 (tcpm_cc_is_audio((port)->cc2) && tcpm_cc_is_open((port)->cc1)))
366
367#define tcpm_try_snk(port) \
ff6c8cb1
BJS		 368 ((port)->try_snk_count == 0 && (port)->try_role == TYPEC_SINK && \
369 (port)->port_type == TYPEC_PORT_DRP)
f0690a25
GR		 370
371#define tcpm_try_src(port) \
ff6c8cb1
BJS		 372 ((port)->try_src_count == 0 && (port)->try_role == TYPEC_SOURCE && \
373 (port)->port_type == TYPEC_PORT_DRP)
f0690a25
GR		 374
375static enum tcpm_state tcpm_default_state(struct tcpm_port *port)
376{
9b0ae699 377 if (port->port_type == TYPEC_PORT_DRP) {
b46a9c90
BJS		 378 if (port->try_role == TYPEC_SINK)
379 return SNK_UNATTACHED;
380 else if (port->try_role == TYPEC_SOURCE)
381 return SRC_UNATTACHED;
1957de95
GR		 382 else if (port->tcpc->config &&
383 port->tcpc->config->default_role == TYPEC_SINK)
b46a9c90
BJS		 384 return SNK_UNATTACHED;
385 /* Fall through to return SRC_UNATTACHED */
ceeb1625 386 } else if (port->port_type == TYPEC_PORT_SNK) {
f0690a25 387 return SNK_UNATTACHED;
b46a9c90 388 }
f0690a25
GR		 389 return SRC_UNATTACHED;
390}
391
392static inline
393struct tcpm_port *typec_cap_to_tcpm(const struct typec_capability *cap)
394{
395 return container_of(cap, struct tcpm_port, typec_caps);
396}
397
398static bool tcpm_port_is_disconnected(struct tcpm_port *port)
399{
400 return (!port->attached && port->cc1 == TYPEC_CC_OPEN &&
401 port->cc2 == TYPEC_CC_OPEN) ||
402 (port->attached && ((port->polarity == TYPEC_POLARITY_CC1 &&
403 port->cc1 == TYPEC_CC_OPEN) ||
404 (port->polarity == TYPEC_POLARITY_CC2 &&
405 port->cc2 == TYPEC_CC_OPEN)));
406}
407
408/*
409 * Logging
410 */
411
412#ifdef CONFIG_DEBUG_FS
413
414static bool tcpm_log_full(struct tcpm_port *port)
415{
416 return port->logbuffer_tail ==
417 (port->logbuffer_head + 1) % LOG_BUFFER_ENTRIES;
418}
419
e79e0125 420__printf(2, 0)
f0690a25
GR		 421static void _tcpm_log(struct tcpm_port *port, const char *fmt, va_list args)
422{
423 char tmpbuffer[LOG_BUFFER_ENTRY_SIZE];
424 u64 ts_nsec = local_clock();
425 unsigned long rem_nsec;
426
d5a4f935 427 mutex_lock(&port->logbuffer_lock);
f0690a25
GR		 428 if (!port->logbuffer[port->logbuffer_head]) {
429 port->logbuffer[port->logbuffer_head] =
430 kzalloc(LOG_BUFFER_ENTRY_SIZE, GFP_KERNEL);
d5a4f935
PC		 431 if (!port->logbuffer[port->logbuffer_head]) {
432 mutex_unlock(&port->logbuffer_lock);
f0690a25 433 return;
d5a4f935 434 }
f0690a25
GR		 435 }
436
437 vsnprintf(tmpbuffer, sizeof(tmpbuffer), fmt, args);
438
f0690a25
GR		 439 if (tcpm_log_full(port)) {
440 port->logbuffer_head = max(port->logbuffer_head - 1, 0);
441 strcpy(tmpbuffer, "overflow");
442 }
443
444 if (port->logbuffer_head < 0 ||
445 port->logbuffer_head >= LOG_BUFFER_ENTRIES) {
446 dev_warn(port->dev,
447 "Bad log buffer index %d\n", port->logbuffer_head);
448 goto abort;
449 }
450
451 if (!port->logbuffer[port->logbuffer_head]) {
452 dev_warn(port->dev,
453 "Log buffer index %d is NULL\n", port->logbuffer_head);
454 goto abort;
455 }
456
457 rem_nsec = do_div(ts_nsec, 1000000000);
458 scnprintf(port->logbuffer[port->logbuffer_head],
459 LOG_BUFFER_ENTRY_SIZE, "[%5lu.%06lu] %s",
460 (unsigned long)ts_nsec, rem_nsec / 1000,
461 tmpbuffer);
462 port->logbuffer_head = (port->logbuffer_head + 1) % LOG_BUFFER_ENTRIES;
463
464abort:
465 mutex_unlock(&port->logbuffer_lock);
466}
467
e79e0125 468__printf(2, 3)
f0690a25
GR		 469static void tcpm_log(struct tcpm_port *port, const char *fmt, ...)
470{
471 va_list args;
472
473 /* Do not log while disconnected and unattached */
474 if (tcpm_port_is_disconnected(port) &&
475 (port->state == SRC_UNATTACHED || port->state == SNK_UNATTACHED ||
7893f9e1 476 port->state == TOGGLING))
f0690a25
GR		 477 return;
478
479 va_start(args, fmt);
480 _tcpm_log(port, fmt, args);
481 va_end(args);
482}
483
e79e0125 484__printf(2, 3)
f0690a25
GR		 485static void tcpm_log_force(struct tcpm_port *port, const char *fmt, ...)
486{
487 va_list args;
488
489 va_start(args, fmt);
490 _tcpm_log(port, fmt, args);
491 va_end(args);
492}
493
494static void tcpm_log_source_caps(struct tcpm_port *port)
495{
496 int i;
497
498 for (i = 0; i < port->nr_source_caps; i++) {
499 u32 pdo = port->source_caps[i];
500 enum pd_pdo_type type = pdo_type(pdo);
501 char msg[64];
502
503 switch (type) {
504 case PDO_TYPE_FIXED:
505 scnprintf(msg, sizeof(msg),
506 "%u mV, %u mA [%s%s%s%s%s%s]",
507 pdo_fixed_voltage(pdo),
508 pdo_max_current(pdo),
509 (pdo & PDO_FIXED_DUAL_ROLE) ?
510 "R" : "",
511 (pdo & PDO_FIXED_SUSPEND) ?
512 "S" : "",
513 (pdo & PDO_FIXED_HIGHER_CAP) ?
514 "H" : "",
515 (pdo & PDO_FIXED_USB_COMM) ?
516 "U" : "",
517 (pdo & PDO_FIXED_DATA_SWAP) ?
518 "D" : "",
519 (pdo & PDO_FIXED_EXTPOWER) ?
520 "E" : "");
521 break;
522 case PDO_TYPE_VAR:
523 scnprintf(msg, sizeof(msg),
524 "%u-%u mV, %u mA",
525 pdo_min_voltage(pdo),
526 pdo_max_voltage(pdo),
527 pdo_max_current(pdo));
528 break;
529 case PDO_TYPE_BATT:
530 scnprintf(msg, sizeof(msg),
531 "%u-%u mV, %u mW",
532 pdo_min_voltage(pdo),
533 pdo_max_voltage(pdo),
534 pdo_max_power(pdo));
535 break;
2eadc33f
AT		 536 case PDO_TYPE_APDO:
537 if (pdo_apdo_type(pdo) == APDO_TYPE_PPS)
538 scnprintf(msg, sizeof(msg),
539 "%u-%u mV, %u mA",
540 pdo_pps_apdo_min_voltage(pdo),
541 pdo_pps_apdo_max_voltage(pdo),
542 pdo_pps_apdo_max_current(pdo));
543 else
544 strcpy(msg, "undefined APDO");
545 break;
f0690a25
GR		 546 default:
547 strcpy(msg, "undefined");
548 break;
549 }
550 tcpm_log(port, " PDO %d: type %d, %s",
551 i, type, msg);
552 }
553}
554
9e902c59 555static int tcpm_debug_show(struct seq_file *s, void *v)
f0690a25
GR		 556{
557 struct tcpm_port *port = (struct tcpm_port *)s->private;
558 int tail;
559
560 mutex_lock(&port->logbuffer_lock);
561 tail = port->logbuffer_tail;
562 while (tail != port->logbuffer_head) {
563 seq_printf(s, "%s\n", port->logbuffer[tail]);
564 tail = (tail + 1) % LOG_BUFFER_ENTRIES;
565 }
566 if (!seq_has_overflowed(s))
567 port->logbuffer_tail = tail;
568 mutex_unlock(&port->logbuffer_lock);
569
570 return 0;
571}
9e902c59 572DEFINE_SHOW_ATTRIBUTE(tcpm_debug);
f0690a25
GR		 573
574static struct dentry *rootdir;
575
a941fc39 576static void tcpm_debugfs_init(struct tcpm_port *port)
f0690a25
GR		 577{
578 mutex_init(&port->logbuffer_lock);
579 /* /sys/kernel/debug/tcpm/usbcX */
a941fc39 580 if (!rootdir)
f0690a25 581 rootdir = debugfs_create_dir("tcpm", NULL);
f0690a25
GR		 582
583 port->dentry = debugfs_create_file(dev_name(port->dev),
584 S_IFREG | 0444, rootdir,
9e902c59 585 port, &tcpm_debug_fops);
f0690a25
GR		 586}
587
588static void tcpm_debugfs_exit(struct tcpm_port *port)
589{
fd5da3e2
LJ		 590 int i;
591
592 mutex_lock(&port->logbuffer_lock);
593 for (i = 0; i < LOG_BUFFER_ENTRIES; i++) {
594 kfree(port->logbuffer[i]);
595 port->logbuffer[i] = NULL;
596 }
597 mutex_unlock(&port->logbuffer_lock);
598
f0690a25 599 debugfs_remove(port->dentry);
12ca7297
LJ		 600 if (list_empty(&rootdir->d_subdirs)) {
601 debugfs_remove(rootdir);
602 rootdir = NULL;
603 }
f0690a25
GR		 604}
605
606#else
607
e79e0125 608__printf(2, 3)
f0690a25 609static void tcpm_log(const struct tcpm_port *port, const char *fmt, ...) { }
e79e0125 610__printf(2, 3)
f0690a25
GR		 611static void tcpm_log_force(struct tcpm_port *port, const char *fmt, ...) { }
612static void tcpm_log_source_caps(struct tcpm_port *port) { }
a941fc39 613static void tcpm_debugfs_init(const struct tcpm_port *port) { }
f0690a25
GR		 614static void tcpm_debugfs_exit(const struct tcpm_port *port) { }
615
616#endif
617
618static int tcpm_pd_transmit(struct tcpm_port *port,
619 enum tcpm_transmit_type type,
620 const struct pd_message *msg)
621{
622 unsigned long timeout;
623 int ret;
624
625 if (msg)
626 tcpm_log(port, "PD TX, header: %#x", le16_to_cpu(msg->header));
627 else
628 tcpm_log(port, "PD TX, type: %#x", type);
629
630 reinit_completion(&port->tx_complete);
631 ret = port->tcpc->pd_transmit(port->tcpc, type, msg);
632 if (ret < 0)
633 return ret;
634
635 mutex_unlock(&port->lock);
636 timeout = wait_for_completion_timeout(&port->tx_complete,
637 msecs_to_jiffies(PD_T_TCPC_TX_TIMEOUT));
638 mutex_lock(&port->lock);
639 if (!timeout)
640 return -ETIMEDOUT;
641
642 switch (port->tx_status) {
643 case TCPC_TX_SUCCESS:
644 port->message_id = (port->message_id + 1) & PD_HEADER_ID_MASK;
645 return 0;
646 case TCPC_TX_DISCARDED:
647 return -EAGAIN;
648 case TCPC_TX_FAILED:
649 default:
650 return -EIO;
651 }
652}
653
654void tcpm_pd_transmit_complete(struct tcpm_port *port,
655 enum tcpm_transmit_status status)
656{
657 tcpm_log(port, "PD TX complete, status: %u", status);
658 port->tx_status = status;
659 complete(&port->tx_complete);
660}
661EXPORT_SYMBOL_GPL(tcpm_pd_transmit_complete);
662
e9576fe8 663static int tcpm_mux_set(struct tcpm_port *port, int state,
2000016c
HG		 664 enum usb_role usb_role,
665 enum typec_orientation orientation)
f0690a25 666{
2000016c 667 int ret;
f0690a25 668
e9576fe8
HK		 669 tcpm_log(port, "Requesting mux state %d, usb-role %d, orientation %d",
670 state, usb_role, orientation);
f0690a25 671
2000016c
HG		 672 ret = typec_set_orientation(port->typec_port, orientation);
673 if (ret)
674 return ret;
f0690a25 675
2000016c
HG		 676 if (port->role_sw) {
677 ret = usb_role_switch_set_role(port->role_sw, usb_role);
678 if (ret)
679 return ret;
680 }
681
e9576fe8 682 return typec_set_mode(port->typec_port, state);
f0690a25
GR		 683}
684
685static int tcpm_set_polarity(struct tcpm_port *port,
686 enum typec_cc_polarity polarity)
687{
688 int ret;
689
690 tcpm_log(port, "polarity %d", polarity);
691
692 ret = port->tcpc->set_polarity(port->tcpc, polarity);
693 if (ret < 0)
694 return ret;
695
696 port->polarity = polarity;
697
698 return 0;
699}
700
701static int tcpm_set_vconn(struct tcpm_port *port, bool enable)
702{
703 int ret;
704
705 tcpm_log(port, "vconn:=%d", enable);
706
707 ret = port->tcpc->set_vconn(port->tcpc, enable);
708 if (!ret) {
709 port->vconn_role = enable ? TYPEC_SOURCE : TYPEC_SINK;
710 typec_set_vconn_role(port->typec_port, port->vconn_role);
711 }
712
713 return ret;
714}
715
716static u32 tcpm_get_current_limit(struct tcpm_port *port)
717{
718 enum typec_cc_status cc;
719 u32 limit;
720
721 cc = port->polarity ? port->cc2 : port->cc1;
722 switch (cc) {
723 case TYPEC_CC_RP_1_5:
724 limit = 1500;
725 break;
726 case TYPEC_CC_RP_3_0:
727 limit = 3000;
728 break;
729 case TYPEC_CC_RP_DEF:
730 default:
ea62cfc7
HG		 731 if (port->tcpc->get_current_limit)
732 limit = port->tcpc->get_current_limit(port->tcpc);
733 else
734 limit = 0;
f0690a25
GR		 735 break;
736 }
737
738 return limit;
739}
740
741static int tcpm_set_current_limit(struct tcpm_port *port, u32 max_ma, u32 mv)
742{
743 int ret = -EOPNOTSUPP;
744
745 tcpm_log(port, "Setting voltage/current limit %u mV %u mA", mv, max_ma);
746
146971e6
HG		 747 port->supply_voltage = mv;
748 port->current_limit = max_ma;
749
f0690a25
GR		 750 if (port->tcpc->set_current_limit)
751 ret = port->tcpc->set_current_limit(port->tcpc, max_ma, mv);
752
753 return ret;
754}
755
756/*
757 * Determine RP value to set based on maximum current supported
758 * by a port if configured as source.
759 * Returns CC value to report to link partner.
760 */
761static enum typec_cc_status tcpm_rp_cc(struct tcpm_port *port)
762{
763 const u32 *src_pdo = port->src_pdo;
764 int nr_pdo = port->nr_src_pdo;
765 int i;
766
767 /*
768 * Search for first entry with matching voltage.
769 * It should report the maximum supported current.
770 */
771 for (i = 0; i < nr_pdo; i++) {
772 const u32 pdo = src_pdo[i];
773
774 if (pdo_type(pdo) == PDO_TYPE_FIXED &&
775 pdo_fixed_voltage(pdo) == 5000) {
776 unsigned int curr = pdo_max_current(pdo);
777
778 if (curr >= 3000)
779 return TYPEC_CC_RP_3_0;
780 else if (curr >= 1500)
781 return TYPEC_CC_RP_1_5;
782 return TYPEC_CC_RP_DEF;
783 }
784 }
785
786 return TYPEC_CC_RP_DEF;
787}
788
789static int tcpm_set_attached_state(struct tcpm_port *port, bool attached)
790{
791 return port->tcpc->set_roles(port->tcpc, attached, port->pwr_role,
792 port->data_role);
793}
794
795static int tcpm_set_roles(struct tcpm_port *port, bool attached,
796 enum typec_role role, enum typec_data_role data)
797{
2000016c 798 enum typec_orientation orientation;
c6962c29 799 enum usb_role usb_role;
f0690a25
GR		 800 int ret;
801
2000016c
HG		 802 if (port->polarity == TYPEC_POLARITY_CC1)
803 orientation = TYPEC_ORIENTATION_NORMAL;
804 else
805 orientation = TYPEC_ORIENTATION_REVERSE;
806
f0690a25 807 if (data == TYPEC_HOST)
c6962c29 808 usb_role = USB_ROLE_HOST;
f0690a25 809 else
c6962c29
HG		 810 usb_role = USB_ROLE_DEVICE;
811
e9576fe8 812 ret = tcpm_mux_set(port, TYPEC_STATE_USB, usb_role, orientation);
f0690a25
GR		 813 if (ret < 0)
814 return ret;
815
816 ret = port->tcpc->set_roles(port->tcpc, attached, role, data);
817 if (ret < 0)
818 return ret;
819
820 port->pwr_role = role;
821 port->data_role = data;
822 typec_set_data_role(port->typec_port, data);
823 typec_set_pwr_role(port->typec_port, role);
824
825 return 0;
826}
827
828static int tcpm_set_pwr_role(struct tcpm_port *port, enum typec_role role)
829{
830 int ret;
831
832 ret = port->tcpc->set_roles(port->tcpc, true, role,
833 port->data_role);
834 if (ret < 0)
835 return ret;
836
837 port->pwr_role = role;
838 typec_set_pwr_role(port->typec_port, role);
839
840 return 0;
841}
842
843static int tcpm_pd_send_source_caps(struct tcpm_port *port)
844{
845 struct pd_message msg;
846 int i;
847
848 memset(&msg, 0, sizeof(msg));
849 if (!port->nr_src_pdo) {
850 /* No source capabilities defined, sink only */
851 msg.header = PD_HEADER_LE(PD_CTRL_REJECT,
852 port->pwr_role,
853 port->data_role,
2eadc33f 854 port->negotiated_rev,
f0690a25
GR		 855 port->message_id, 0);
856 } else {
857 msg.header = PD_HEADER_LE(PD_DATA_SOURCE_CAP,
858 port->pwr_role,
859 port->data_role,
2eadc33f 860 port->negotiated_rev,
f0690a25
GR		 861 port->message_id,
862 port->nr_src_pdo);
863 }
864 for (i = 0; i < port->nr_src_pdo; i++)
865 msg.payload[i] = cpu_to_le32(port->src_pdo[i]);
866
867 return tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
868}
869
870static int tcpm_pd_send_sink_caps(struct tcpm_port *port)
871{
872 struct pd_message msg;
873 int i;
874
875 memset(&msg, 0, sizeof(msg));
876 if (!port->nr_snk_pdo) {
877 /* No sink capabilities defined, source only */
878 msg.header = PD_HEADER_LE(PD_CTRL_REJECT,
879 port->pwr_role,
880 port->data_role,
2eadc33f 881 port->negotiated_rev,
f0690a25
GR		 882 port->message_id, 0);
883 } else {
884 msg.header = PD_HEADER_LE(PD_DATA_SINK_CAP,
885 port->pwr_role,
886 port->data_role,
2eadc33f 887 port->negotiated_rev,
f0690a25
GR		 888 port->message_id,
889 port->nr_snk_pdo);
890 }
891 for (i = 0; i < port->nr_snk_pdo; i++)
892 msg.payload[i] = cpu_to_le32(port->snk_pdo[i]);
893
894 return tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
895}
896
897static void tcpm_set_state(struct tcpm_port *port, enum tcpm_state state,
898 unsigned int delay_ms)
899{
900 if (delay_ms) {
901 tcpm_log(port, "pending state change %s -> %s @ %u ms",
902 tcpm_states[port->state], tcpm_states[state],
903 delay_ms);
904 port->delayed_state = state;
905 mod_delayed_work(port->wq, &port->state_machine,
906 msecs_to_jiffies(delay_ms));
907 port->delayed_runtime = jiffies + msecs_to_jiffies(delay_ms);
908 port->delay_ms = delay_ms;
909 } else {
910 tcpm_log(port, "state change %s -> %s",
911 tcpm_states[port->state], tcpm_states[state]);
912 port->delayed_state = INVALID_STATE;
913 port->prev_state = port->state;
914 port->state = state;
915 /*
916 * Don't re-queue the state machine work item if we're currently
917 * in the state machine and we're immediately changing states.
918 * tcpm_state_machine_work() will continue running the state
919 * machine.
920 */
921 if (!port->state_machine_running)
922 mod_delayed_work(port->wq, &port->state_machine, 0);
923 }
924}
925
926static void tcpm_set_state_cond(struct tcpm_port *port, enum tcpm_state state,
927 unsigned int delay_ms)
928{
929 if (port->enter_state == port->state)
930 tcpm_set_state(port, state, delay_ms);
931 else
932 tcpm_log(port,
933 "skipped %sstate change %s -> %s [%u ms], context state %s",
934 delay_ms ? "delayed " : "",
935 tcpm_states[port->state], tcpm_states[state],
936 delay_ms, tcpm_states[port->enter_state]);
937}
938
939static void tcpm_queue_message(struct tcpm_port *port,
940 enum pd_msg_request message)
941{
942 port->queued_message = message;
943 mod_delayed_work(port->wq, &port->state_machine, 0);
944}
945
946/*
947 * VDM/VDO handling functions
948 */
949static void tcpm_queue_vdm(struct tcpm_port *port, const u32 header,
950 const u32 *data, int cnt)
951{
952 port->vdo_count = cnt + 1;
953 port->vdo_data[0] = header;
954 memcpy(&port->vdo_data[1], data, sizeof(u32) * cnt);
955 /* Set ready, vdm state machine will actually send */
956 port->vdm_retries = 0;
957 port->vdm_state = VDM_STATE_READY;
958}
959
960static void svdm_consume_identity(struct tcpm_port *port, const __le32 *payload,
961 int cnt)
962{
963 u32 vdo = le32_to_cpu(payload[VDO_INDEX_IDH]);
964 u32 product = le32_to_cpu(payload[VDO_INDEX_PRODUCT]);
965
966 memset(&port->mode_data, 0, sizeof(port->mode_data));
967
f0690a25
GR		 968 port->partner_ident.id_header = vdo;
969 port->partner_ident.cert_stat = le32_to_cpu(payload[VDO_INDEX_CSTAT]);
970 port->partner_ident.product = product;
971
972 typec_partner_set_identity(port->partner);
973
974 tcpm_log(port, "Identity: %04x:%04x.%04x",
975 PD_IDH_VID(vdo),
976 PD_PRODUCT_PID(product), product & 0xffff);
977}
978
979static bool svdm_consume_svids(struct tcpm_port *port, const __le32 *payload,
980 int cnt)
981{
982 struct pd_mode_data *pmdata = &port->mode_data;
983 int i;
984
985 for (i = 1; i < cnt; i++) {
986 u32 p = le32_to_cpu(payload[i]);
987 u16 svid;
988
989 svid = (p >> 16) & 0xffff;
990 if (!svid)
991 return false;
992
993 if (pmdata->nsvids >= SVID_DISCOVERY_MAX)
994 goto abort;
995
996 pmdata->svids[pmdata->nsvids++] = svid;
997 tcpm_log(port, "SVID %d: 0x%x", pmdata->nsvids, svid);
998
999 svid = p & 0xffff;
1000 if (!svid)
1001 return false;
1002
1003 if (pmdata->nsvids >= SVID_DISCOVERY_MAX)
1004 goto abort;
1005
1006 pmdata->svids[pmdata->nsvids++] = svid;
1007 tcpm_log(port, "SVID %d: 0x%x", pmdata->nsvids, svid);
1008 }
1009 return true;
1010abort:
1011 tcpm_log(port, "SVID_DISCOVERY_MAX(%d) too low!", SVID_DISCOVERY_MAX);
1012 return false;
1013}
1014
1015static void svdm_consume_modes(struct tcpm_port *port, const __le32 *payload,
1016 int cnt)
1017{
1018 struct pd_mode_data *pmdata = &port->mode_data;
1019 struct typec_altmode_desc *paltmode;
f0690a25
GR		 1020 int i;
1021
1022 if (pmdata->altmodes >= ARRAY_SIZE(port->partner_altmode)) {
1023 /* Already logged in svdm_consume_svids() */
1024 return;
1025 }
1026
4ab8c18d
HK		 1027 for (i = 1; i < cnt; i++) {
1028 paltmode = &pmdata->altmode_desc[pmdata->altmodes];
1029 memset(paltmode, 0, sizeof(*paltmode));
1030
1031 paltmode->svid = pmdata->svids[pmdata->svid_index];
1032 paltmode->mode = i;
1033 paltmode->vdo = le32_to_cpu(payload[i]);
1034
1035 tcpm_log(port, " Alternate mode %d: SVID 0x%04x, VDO %d: 0x%08x",
1036 pmdata->altmodes, paltmode->svid,
1037 paltmode->mode, paltmode->vdo);
1038
4ab8c18d 1039 pmdata->altmodes++;
f0690a25 1040 }
f0690a25
GR		 1041}
1042
e9576fe8
HK		 1043static void tcpm_register_partner_altmodes(struct tcpm_port *port)
1044{
1045 struct pd_mode_data *modep = &port->mode_data;
1046 struct typec_altmode *altmode;
1047 int i;
1048
1049 for (i = 0; i < modep->altmodes; i++) {
1050 altmode = typec_partner_register_altmode(port->partner,
1051 &modep->altmode_desc[i]);
1052 if (!altmode)
1053 tcpm_log(port, "Failed to register partner SVID 0x%04x",
1054 modep->altmode_desc[i].svid);
1055 port->partner_altmode[i] = altmode;
1056 }
1057}
1058
f0690a25
GR		 1059#define supports_modal(port) PD_IDH_MODAL_SUPP((port)->partner_ident.id_header)
1060
1061static int tcpm_pd_svdm(struct tcpm_port *port, const __le32 *payload, int cnt,
1062 u32 *response)
1063{
e9576fe8
HK		 1064 struct typec_altmode *adev;
1065 struct typec_altmode *pdev;
f0690a25 1066 struct pd_mode_data *modep;
e9576fe8 1067 u32 p[PD_MAX_PAYLOAD];
f0690a25 1068 int rlen = 0;
e9576fe8
HK		 1069 int cmd_type;
1070 int cmd;
193a6801 1071 int i;
f0690a25 1072
e9576fe8
HK		 1073 for (i = 0; i < cnt; i++)
1074 p[i] = le32_to_cpu(payload[i]);
1075
1076 cmd_type = PD_VDO_CMDT(p[0]);
1077 cmd = PD_VDO_CMD(p[0]);
1078
f0690a25 1079 tcpm_log(port, "Rx VDM cmd 0x%x type %d cmd %d len %d",
e9576fe8 1080 p[0], cmd_type, cmd, cnt);
f0690a25
GR		 1081
1082 modep = &port->mode_data;
1083
e9576fe8
HK		 1084 adev = typec_match_altmode(port->port_altmode, ALTMODE_DISCOVERY_MAX,
1085 PD_VDO_VID(p[0]), PD_VDO_OPOS(p[0]));
1086
1087 pdev = typec_match_altmode(port->partner_altmode, ALTMODE_DISCOVERY_MAX,
1088 PD_VDO_VID(p[0]), PD_VDO_OPOS(p[0]));
1089
f0690a25
GR		 1090 switch (cmd_type) {
1091 case CMDT_INIT:
1092 switch (cmd) {
1093 case CMD_DISCOVER_IDENT:
193a6801
GR		 1094 /* 6.4.4.3.1: Only respond as UFP (device) */
1095 if (port->data_role == TYPEC_DEVICE &&
1096 port->nr_snk_vdo) {
1097 for (i = 0; i < port->nr_snk_vdo; i++)
cbe5843e 1098 response[i + 1] = port->snk_vdo[i];
193a6801
GR		 1099 rlen = port->nr_snk_vdo + 1;
1100 }
f0690a25
GR		 1101 break;
1102 case CMD_DISCOVER_SVID:
1103 break;
1104 case CMD_DISCOVER_MODES:
1105 break;
1106 case CMD_ENTER_MODE:
1107 break;
1108 case CMD_EXIT_MODE:
1109 break;
1110 case CMD_ATTENTION:
e9576fe8 1111 /* Attention command does not have response */
88d02c9b
GR		 1112 if (adev)
1113 typec_altmode_attention(adev, p[1]);
e9576fe8 1114 return 0;
f0690a25
GR		 1115 default:
1116 break;
1117 }
1118 if (rlen >= 1) {
e9576fe8 1119 response[0] = p[0] | VDO_CMDT(CMDT_RSP_ACK);
f0690a25 1120 } else if (rlen == 0) {
e9576fe8 1121 response[0] = p[0] | VDO_CMDT(CMDT_RSP_NAK);
f0690a25
GR		 1122 rlen = 1;
1123 } else {
e9576fe8 1124 response[0] = p[0] | VDO_CMDT(CMDT_RSP_BUSY);
f0690a25
GR		 1125 rlen = 1;
1126 }
1127 break;
1128 case CMDT_RSP_ACK:
1129 /* silently drop message if we are not connected */
cf6e06cd 1130 if (IS_ERR_OR_NULL(port->partner))
f0690a25
GR		 1131 break;
1132
1133 switch (cmd) {
1134 case CMD_DISCOVER_IDENT:
1135 /* 6.4.4.3.1 */
1136 svdm_consume_identity(port, payload, cnt);
1137 response[0] = VDO(USB_SID_PD, 1, CMD_DISCOVER_SVID);
1138 rlen = 1;
1139 break;
1140 case CMD_DISCOVER_SVID:
1141 /* 6.4.4.3.2 */
1142 if (svdm_consume_svids(port, payload, cnt)) {
1143 response[0] = VDO(USB_SID_PD, 1,
1144 CMD_DISCOVER_SVID);
1145 rlen = 1;
1146 } else if (modep->nsvids && supports_modal(port)) {
1147 response[0] = VDO(modep->svids[0], 1,
1148 CMD_DISCOVER_MODES);
1149 rlen = 1;
1150 }
1151 break;
1152 case CMD_DISCOVER_MODES:
1153 /* 6.4.4.3.3 */
1154 svdm_consume_modes(port, payload, cnt);
1155 modep->svid_index++;
1156 if (modep->svid_index < modep->nsvids) {
e9576fe8 1157 u16 svid = modep->svids[modep->svid_index];
f0690a25
GR		 1158 response[0] = VDO(svid, 1, CMD_DISCOVER_MODES);
1159 rlen = 1;
1160 } else {
e9576fe8 1161 tcpm_register_partner_altmodes(port);
f0690a25
GR		 1162 }
1163 break;
1164 case CMD_ENTER_MODE:
88d02c9b
GR		 1165 if (adev && pdev) {
1166 typec_altmode_update_active(pdev, true);
1167
1168 if (typec_altmode_vdm(adev, p[0], &p[1], cnt)) {
1169 response[0] = VDO(adev->svid, 1,
1170 CMD_EXIT_MODE);
1171 response[0] |= VDO_OPOS(adev->mode);
1172 return 1;
1173 }
e9576fe8
HK		 1174 }
1175 return 0;
1176 case CMD_EXIT_MODE:
88d02c9b
GR		 1177 if (adev && pdev) {
1178 typec_altmode_update_active(pdev, false);
e9576fe8 1179
88d02c9b
GR		 1180 /* Back to USB Operation */
1181 WARN_ON(typec_altmode_notify(adev,
1182 TYPEC_STATE_USB,
1183 NULL));
1184 }
e9576fe8
HK		 1185 break;
1186 default:
1187 break;
1188 }
1189 break;
1190 case CMDT_RSP_NAK:
1191 switch (cmd) {
1192 case CMD_ENTER_MODE:
1193 /* Back to USB Operation */
88d02c9b
GR		 1194 if (adev)
1195 WARN_ON(typec_altmode_notify(adev,
1196 TYPEC_STATE_USB,
1197 NULL));
f0690a25
GR		 1198 break;
1199 default:
1200 break;
1201 }
1202 break;
1203 default:
1204 break;
1205 }
1206
e9576fe8 1207 /* Informing the alternate mode drivers about everything */
88d02c9b
GR		 1208 if (adev)
1209 typec_altmode_vdm(adev, p[0], &p[1], cnt);
e9576fe8 1210
f0690a25
GR		 1211 return rlen;
1212}
1213
1214static void tcpm_handle_vdm_request(struct tcpm_port *port,
1215 const __le32 *payload, int cnt)
1216{
1217 int rlen = 0;
1218 u32 response[8] = { };
1219 u32 p0 = le32_to_cpu(payload[0]);
1220
1221 if (port->vdm_state == VDM_STATE_BUSY) {
1222 /* If UFP responded busy retry after timeout */
1223 if (PD_VDO_CMDT(p0) == CMDT_RSP_BUSY) {
1224 port->vdm_state = VDM_STATE_WAIT_RSP_BUSY;
1225 port->vdo_retry = (p0 & ~VDO_CMDT_MASK) |
1226 CMDT_INIT;
1227 mod_delayed_work(port->wq, &port->vdm_state_machine,
1228 msecs_to_jiffies(PD_T_VDM_BUSY));
1229 return;
1230 }
1231 port->vdm_state = VDM_STATE_DONE;
1232 }
1233
1234 if (PD_VDO_SVDM(p0))
1235 rlen = tcpm_pd_svdm(port, payload, cnt, response);
f0690a25
GR		 1236
1237 if (rlen > 0) {
1238 tcpm_queue_vdm(port, response[0], &response[1], rlen - 1);
1239 mod_delayed_work(port->wq, &port->vdm_state_machine, 0);
1240 }
1241}
1242
1243static void tcpm_send_vdm(struct tcpm_port *port, u32 vid, int cmd,
1244 const u32 *data, int count)
1245{
1246 u32 header;
1247
1248 if (WARN_ON(count > VDO_MAX_SIZE - 1))
1249 count = VDO_MAX_SIZE - 1;
1250
1251 /* set VDM header with VID & CMD */
1252 header = VDO(vid, ((vid & USB_SID_PD) == USB_SID_PD) ?
1253 1 : (PD_VDO_CMD(cmd) <= CMD_ATTENTION), cmd);
1254 tcpm_queue_vdm(port, header, data, count);
1255
1256 mod_delayed_work(port->wq, &port->vdm_state_machine, 0);
1257}
1258
1259static unsigned int vdm_ready_timeout(u32 vdm_hdr)
1260{
1261 unsigned int timeout;
1262 int cmd = PD_VDO_CMD(vdm_hdr);
1263
1264 /* its not a structured VDM command */
1265 if (!PD_VDO_SVDM(vdm_hdr))
1266 return PD_T_VDM_UNSTRUCTURED;
1267
1268 switch (PD_VDO_CMDT(vdm_hdr)) {
1269 case CMDT_INIT:
1270 if (cmd == CMD_ENTER_MODE || cmd == CMD_EXIT_MODE)
1271 timeout = PD_T_VDM_WAIT_MODE_E;
1272 else
1273 timeout = PD_T_VDM_SNDR_RSP;
1274 break;
1275 default:
1276 if (cmd == CMD_ENTER_MODE || cmd == CMD_EXIT_MODE)
1277 timeout = PD_T_VDM_E_MODE;
1278 else
1279 timeout = PD_T_VDM_RCVR_RSP;
1280 break;
1281 }
1282 return timeout;
1283}
1284
1285static void vdm_run_state_machine(struct tcpm_port *port)
1286{
1287 struct pd_message msg;
1288 int i, res;
1289
1290 switch (port->vdm_state) {
1291 case VDM_STATE_READY:
1292 /* Only transmit VDM if attached */
1293 if (!port->attached) {
1294 port->vdm_state = VDM_STATE_ERR_BUSY;
1295 break;
1296 }
1297
1298 /*
1299 * if there's traffic or we're not in PDO ready state don't send
1300 * a VDM.
1301 */
1302 if (port->state != SRC_READY && port->state != SNK_READY)
1303 break;
1304
1305 /* Prepare and send VDM */
1306 memset(&msg, 0, sizeof(msg));
1307 msg.header = PD_HEADER_LE(PD_DATA_VENDOR_DEF,
1308 port->pwr_role,
1309 port->data_role,
2eadc33f 1310 port->negotiated_rev,
f0690a25
GR		 1311 port->message_id, port->vdo_count);
1312 for (i = 0; i < port->vdo_count; i++)
1313 msg.payload[i] = cpu_to_le32(port->vdo_data[i]);
1314 res = tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
1315 if (res < 0) {
1316 port->vdm_state = VDM_STATE_ERR_SEND;
1317 } else {
1318 unsigned long timeout;
1319
1320 port->vdm_retries = 0;
1321 port->vdm_state = VDM_STATE_BUSY;
1322 timeout = vdm_ready_timeout(port->vdo_data[0]);
1323 mod_delayed_work(port->wq, &port->vdm_state_machine,
1324 timeout);
1325 }
1326 break;
1327 case VDM_STATE_WAIT_RSP_BUSY:
1328 port->vdo_data[0] = port->vdo_retry;
1329 port->vdo_count = 1;
1330 port->vdm_state = VDM_STATE_READY;
1331 break;
1332 case VDM_STATE_BUSY:
1333 port->vdm_state = VDM_STATE_ERR_TMOUT;
1334 break;
1335 case VDM_STATE_ERR_SEND:
1336 /*
1337 * A partner which does not support USB PD will not reply,
1338 * so this is not a fatal error. At the same time, some
1339 * devices may not return GoodCRC under some circumstances,
1340 * so we need to retry.
1341 */
1342 if (port->vdm_retries < 3) {
1343 tcpm_log(port, "VDM Tx error, retry");
1344 port->vdm_retries++;
1345 port->vdm_state = VDM_STATE_READY;
1346 }
1347 break;
1348 default:
1349 break;
1350 }
1351}
1352
1353static void vdm_state_machine_work(struct work_struct *work)
1354{
1355 struct tcpm_port *port = container_of(work, struct tcpm_port,
1356 vdm_state_machine.work);
1357 enum vdm_states prev_state;
1358
1359 mutex_lock(&port->lock);
1360
1361 /*
1362 * Continue running as long as the port is not busy and there was
1363 * a state change.
1364 */
1365 do {
1366 prev_state = port->vdm_state;
1367 vdm_run_state_machine(port);
1368 } while (port->vdm_state != prev_state &&
1369 port->vdm_state != VDM_STATE_BUSY);
1370
1371 mutex_unlock(&port->lock);
1372}
1373
5007e1b5
BJS		 1374enum pdo_err {
1375 PDO_NO_ERR,
1376 PDO_ERR_NO_VSAFE5V,
1377 PDO_ERR_VSAFE5V_NOT_FIRST,
1378 PDO_ERR_PDO_TYPE_NOT_IN_ORDER,
1379 PDO_ERR_FIXED_NOT_SORTED,
1380 PDO_ERR_VARIABLE_BATT_NOT_SORTED,
1381 PDO_ERR_DUPE_PDO,
2eadc33f
AT		 1382 PDO_ERR_PPS_APDO_NOT_SORTED,
1383 PDO_ERR_DUPE_PPS_APDO,
5007e1b5
BJS		 1384};
1385
1386static const char * const pdo_err_msg[] = {
1387 [PDO_ERR_NO_VSAFE5V] =
1388 " err: source/sink caps should atleast have vSafe5V",
1389 [PDO_ERR_VSAFE5V_NOT_FIRST] =
1390 " err: vSafe5V Fixed Supply Object Shall always be the first object",
1391 [PDO_ERR_PDO_TYPE_NOT_IN_ORDER] =
1392 " err: PDOs should be in the following order: Fixed; Battery; Variable",
1393 [PDO_ERR_FIXED_NOT_SORTED] =
1394 " err: Fixed supply pdos should be in increasing order of their fixed voltage",
1395 [PDO_ERR_VARIABLE_BATT_NOT_SORTED] =
1396 " err: Variable/Battery supply pdos should be in increasing order of their minimum voltage",
1397 [PDO_ERR_DUPE_PDO] =
1398 " err: Variable/Batt supply pdos cannot have same min/max voltage",
2eadc33f
AT		 1399 [PDO_ERR_PPS_APDO_NOT_SORTED] =
1400 " err: Programmable power supply apdos should be in increasing order of their maximum voltage",
1401 [PDO_ERR_DUPE_PPS_APDO] =
1402 " err: Programmable power supply apdos cannot have same min/max voltage and max current",
5007e1b5
BJS		 1403};
1404
1405static enum pdo_err tcpm_caps_err(struct tcpm_port *port, const u32 *pdo,
1406 unsigned int nr_pdo)
1407{
1408 unsigned int i;
1409
1410 /* Should at least contain vSafe5v */
1411 if (nr_pdo < 1)
1412 return PDO_ERR_NO_VSAFE5V;
1413
1414 /* The vSafe5V Fixed Supply Object Shall always be the first object */
1415 if (pdo_type(pdo[0]) != PDO_TYPE_FIXED ||
1416 pdo_fixed_voltage(pdo[0]) != VSAFE5V)
1417 return PDO_ERR_VSAFE5V_NOT_FIRST;
1418
1419 for (i = 1; i < nr_pdo; i++) {
1420 if (pdo_type(pdo[i]) < pdo_type(pdo[i - 1])) {
1421 return PDO_ERR_PDO_TYPE_NOT_IN_ORDER;
1422 } else if (pdo_type(pdo[i]) == pdo_type(pdo[i - 1])) {
1423 enum pd_pdo_type type = pdo_type(pdo[i]);
1424
1425 switch (type) {
1426 /*
1427 * The remaining Fixed Supply Objects, if
1428 * present, shall be sent in voltage order;
1429 * lowest to highest.
1430 */
1431 case PDO_TYPE_FIXED:
1432 if (pdo_fixed_voltage(pdo[i]) <=
1433 pdo_fixed_voltage(pdo[i - 1]))
1434 return PDO_ERR_FIXED_NOT_SORTED;
1435 break;
1436 /*
1437 * The Battery Supply Objects and Variable
1438 * supply, if present shall be sent in Minimum
1439 * Voltage order; lowest to highest.
1440 */
1441 case PDO_TYPE_VAR:
1442 case PDO_TYPE_BATT:
1443 if (pdo_min_voltage(pdo[i]) <
1444 pdo_min_voltage(pdo[i - 1]))
1445 return PDO_ERR_VARIABLE_BATT_NOT_SORTED;
1446 else if ((pdo_min_voltage(pdo[i]) ==
1447 pdo_min_voltage(pdo[i - 1])) &&
1448 (pdo_max_voltage(pdo[i]) ==
1449 pdo_min_voltage(pdo[i - 1])))
1450 return PDO_ERR_DUPE_PDO;
1451 break;
2eadc33f
AT		 1452 /*
1453 * The Programmable Power Supply APDOs, if present,
1454 * shall be sent in Maximum Voltage order;
1455 * lowest to highest.
1456 */
1457 case PDO_TYPE_APDO:
1458 if (pdo_apdo_type(pdo[i]) != APDO_TYPE_PPS)
1459 break;
1460
1b6af2f5
AT		 1461 if (pdo_pps_apdo_max_voltage(pdo[i]) <
1462 pdo_pps_apdo_max_voltage(pdo[i - 1]))
2eadc33f
AT		 1463 return PDO_ERR_PPS_APDO_NOT_SORTED;
1464 else if (pdo_pps_apdo_min_voltage(pdo[i]) ==
1465 pdo_pps_apdo_min_voltage(pdo[i - 1]) &&
1466 pdo_pps_apdo_max_voltage(pdo[i]) ==
1467 pdo_pps_apdo_max_voltage(pdo[i - 1]) &&
1468 pdo_pps_apdo_max_current(pdo[i]) ==
1469 pdo_pps_apdo_max_current(pdo[i - 1]))
1470 return PDO_ERR_DUPE_PPS_APDO;
1471 break;
5007e1b5
BJS		 1472 default:
1473 tcpm_log_force(port, " Unknown pdo type");
1474 }
1475 }
1476 }
1477
1478 return PDO_NO_ERR;
1479}
1480
1481static int tcpm_validate_caps(struct tcpm_port *port, const u32 *pdo,
1482 unsigned int nr_pdo)
1483{
1484 enum pdo_err err_index = tcpm_caps_err(port, pdo, nr_pdo);
1485
1486 if (err_index != PDO_NO_ERR) {
1487 tcpm_log_force(port, " %s", pdo_err_msg[err_index]);
1488 return -EINVAL;
1489 }
1490
1491 return 0;
1492}
1493
e9576fe8
HK		 1494static int tcpm_altmode_enter(struct typec_altmode *altmode)
1495{
1496 struct tcpm_port *port = typec_altmode_get_drvdata(altmode);
1497 u32 header;
1498
1499 mutex_lock(&port->lock);
1500 header = VDO(altmode->svid, 1, CMD_ENTER_MODE);
1501 header |= VDO_OPOS(altmode->mode);
1502
1503 tcpm_queue_vdm(port, header, NULL, 0);
1504 mod_delayed_work(port->wq, &port->vdm_state_machine, 0);
1505 mutex_unlock(&port->lock);
1506
1507 return 0;
1508}
1509
1510static int tcpm_altmode_exit(struct typec_altmode *altmode)
1511{
1512 struct tcpm_port *port = typec_altmode_get_drvdata(altmode);
1513 u32 header;
1514
1515 mutex_lock(&port->lock);
1516 header = VDO(altmode->svid, 1, CMD_EXIT_MODE);
1517 header |= VDO_OPOS(altmode->mode);
1518
1519 tcpm_queue_vdm(port, header, NULL, 0);
1520 mod_delayed_work(port->wq, &port->vdm_state_machine, 0);
1521 mutex_unlock(&port->lock);
1522
1523 return 0;
1524}
1525
1526static int tcpm_altmode_vdm(struct typec_altmode *altmode,
1527 u32 header, const u32 *data, int count)
1528{
1529 struct tcpm_port *port = typec_altmode_get_drvdata(altmode);
1530
1531 mutex_lock(&port->lock);
1532 tcpm_queue_vdm(port, header, data, count - 1);
1533 mod_delayed_work(port->wq, &port->vdm_state_machine, 0);
1534 mutex_unlock(&port->lock);
1535
1536 return 0;
1537}
1538
1539static const struct typec_altmode_ops tcpm_altmode_ops = {
1540 .enter = tcpm_altmode_enter,
1541 .exit = tcpm_altmode_exit,
1542 .vdm = tcpm_altmode_vdm,
1543};
1544
f0690a25
GR		 1545/*
1546 * PD (data, control) command handling functions
1547 */
64f7c494
AT		 1548static inline enum tcpm_state ready_state(struct tcpm_port *port)
1549{
1550 if (port->pwr_role == TYPEC_SOURCE)
1551 return SRC_READY;
1552 else
1553 return SNK_READY;
1554}
2eadc33f
AT		 1555
1556static int tcpm_pd_send_control(struct tcpm_port *port,
1557 enum pd_ctrl_msg_type type);
1558
64f7c494
AT		 1559static void tcpm_handle_alert(struct tcpm_port *port, const __le32 *payload,
1560 int cnt)
1561{
1562 u32 p0 = le32_to_cpu(payload[0]);
1563 unsigned int type = usb_pd_ado_type(p0);
1564
1565 if (!type) {
1566 tcpm_log(port, "Alert message received with no type");
1567 return;
1568 }
1569
1570 /* Just handling non-battery alerts for now */
1571 if (!(type & USB_PD_ADO_TYPE_BATT_STATUS_CHANGE)) {
1572 switch (port->state) {
1573 case SRC_READY:
1574 case SNK_READY:
1575 tcpm_set_state(port, GET_STATUS_SEND, 0);
1576 break;
1577 default:
1578 tcpm_queue_message(port, PD_MSG_CTRL_WAIT);
1579 break;
1580 }
1581 }
1582}
1583
f0690a25
GR		 1584static void tcpm_pd_data_request(struct tcpm_port *port,
1585 const struct pd_message *msg)
1586{
1587 enum pd_data_msg_type type = pd_header_type_le(msg->header);
1588 unsigned int cnt = pd_header_cnt_le(msg->header);
2eadc33f 1589 unsigned int rev = pd_header_rev_le(msg->header);
f0690a25
GR		 1590 unsigned int i;
1591
1592 switch (type) {
1593 case PD_DATA_SOURCE_CAP:
1594 if (port->pwr_role != TYPEC_SINK)
1595 break;
1596
1597 for (i = 0; i < cnt; i++)
1598 port->source_caps[i] = le32_to_cpu(msg->payload[i]);
1599
1600 port->nr_source_caps = cnt;
1601
1602 tcpm_log_source_caps(port);
1603
5007e1b5
BJS		 1604 tcpm_validate_caps(port, port->source_caps,
1605 port->nr_source_caps);
1606
2eadc33f
AT		 1607 /*
1608 * Adjust revision in subsequent message headers, as required,
1609 * to comply with 6.2.1.1.5 of the USB PD 3.0 spec. We don't
1610 * support Rev 1.0 so just do nothing in that scenario.
1611 */
1612 if (rev == PD_REV10)
1613 break;
1614
1615 if (rev < PD_MAX_REV)
1616 port->negotiated_rev = rev;
1617
f0690a25
GR		 1618 /*
1619 * This message may be received even if VBUS is not
1620 * present. This is quite unexpected; see USB PD
1621 * specification, sections 8.3.3.6.3.1 and 8.3.3.6.3.2.
1622 * However, at the same time, we must be ready to
1623 * receive this message and respond to it 15ms after
1624 * receiving PS_RDY during power swap operations, no matter
1625 * if VBUS is available or not (USB PD specification,
1626 * section 6.5.9.2).
1627 * So we need to accept the message either way,
1628 * but be prepared to keep waiting for VBUS after it was
1629 * handled.
1630 */
1631 tcpm_set_state(port, SNK_NEGOTIATE_CAPABILITIES, 0);
1632 break;
1633 case PD_DATA_REQUEST:
1634 if (port->pwr_role != TYPEC_SOURCE ||
1635 cnt != 1) {
1636 tcpm_queue_message(port, PD_MSG_CTRL_REJECT);
1637 break;
1638 }
2eadc33f
AT		 1639
1640 /*
1641 * Adjust revision in subsequent message headers, as required,
1642 * to comply with 6.2.1.1.5 of the USB PD 3.0 spec. We don't
1643 * support Rev 1.0 so just reject in that scenario.
1644 */
1645 if (rev == PD_REV10) {
1646 tcpm_queue_message(port, PD_MSG_CTRL_REJECT);
1647 break;
1648 }
1649
1650 if (rev < PD_MAX_REV)
1651 port->negotiated_rev = rev;
1652
f0690a25
GR		 1653 port->sink_request = le32_to_cpu(msg->payload[0]);
1654 tcpm_set_state(port, SRC_NEGOTIATE_CAPABILITIES, 0);
1655 break;
1656 case PD_DATA_SINK_CAP:
1657 /* We don't do anything with this at the moment... */
1658 for (i = 0; i < cnt; i++)
1659 port->sink_caps[i] = le32_to_cpu(msg->payload[i]);
1660 port->nr_sink_caps = cnt;
1661 break;
1662 case PD_DATA_VENDOR_DEF:
1663 tcpm_handle_vdm_request(port, msg->payload, cnt);
1664 break;
1665 case PD_DATA_BIST:
1666 if (port->state == SRC_READY || port->state == SNK_READY) {
1667 port->bist_request = le32_to_cpu(msg->payload[0]);
1668 tcpm_set_state(port, BIST_RX, 0);
1669 }
1670 break;
64f7c494
AT		 1671 case PD_DATA_ALERT:
1672 tcpm_handle_alert(port, msg->payload, cnt);
1673 break;
1674 case PD_DATA_BATT_STATUS:
1675 case PD_DATA_GET_COUNTRY_INFO:
1676 /* Currently unsupported */
1677 tcpm_queue_message(port, PD_MSG_CTRL_NOT_SUPP);
1678 break;
f0690a25
GR		 1679 default:
1680 tcpm_log(port, "Unhandled data message type %#x", type);
1681 break;
1682 }
1683}
1684
2eadc33f
AT		 1685static void tcpm_pps_complete(struct tcpm_port *port, int result)
1686{
1687 if (port->pps_pending) {
1688 port->pps_status = result;
1689 port->pps_pending = false;
1690 complete(&port->pps_complete);
1691 }
1692}
1693
f0690a25
GR		 1694static void tcpm_pd_ctrl_request(struct tcpm_port *port,
1695 const struct pd_message *msg)
1696{
1697 enum pd_ctrl_msg_type type = pd_header_type_le(msg->header);
1698 enum tcpm_state next_state;
1699
1700 switch (type) {
1701 case PD_CTRL_GOOD_CRC:
1702 case PD_CTRL_PING:
1703 break;
1704 case PD_CTRL_GET_SOURCE_CAP:
1705 switch (port->state) {
1706 case SRC_READY:
1707 case SNK_READY:
1708 tcpm_queue_message(port, PD_MSG_DATA_SOURCE_CAP);
1709 break;
1710 default:
1711 tcpm_queue_message(port, PD_MSG_CTRL_REJECT);
1712 break;
1713 }
1714 break;
1715 case PD_CTRL_GET_SINK_CAP:
1716 switch (port->state) {
1717 case SRC_READY:
1718 case SNK_READY:
1719 tcpm_queue_message(port, PD_MSG_DATA_SINK_CAP);
1720 break;
1721 default:
1722 tcpm_queue_message(port, PD_MSG_CTRL_REJECT);
1723 break;
1724 }
1725 break;
1726 case PD_CTRL_GOTO_MIN:
1727 break;
1728 case PD_CTRL_PS_RDY:
1729 switch (port->state) {
1730 case SNK_TRANSITION_SINK:
1731 if (port->vbus_present) {
1732 tcpm_set_current_limit(port,
1733 port->current_limit,
1734 port->supply_voltage);
8bf05746 1735 port->explicit_contract = true;
f0690a25
GR		 1736 tcpm_set_state(port, SNK_READY, 0);
1737 } else {
1738 /*
1739 * Seen after power swap. Keep waiting for VBUS
1740 * in a transitional state.
1741 */
1742 tcpm_set_state(port,
1743 SNK_TRANSITION_SINK_VBUS, 0);
1744 }
1745 break;
b965b631 1746 case PR_SWAP_SRC_SNK_SOURCE_OFF_CC_DEBOUNCED:
f0690a25
GR		 1747 tcpm_set_state(port, PR_SWAP_SRC_SNK_SINK_ON, 0);
1748 break;
1749 case PR_SWAP_SNK_SRC_SINK_OFF:
1750 tcpm_set_state(port, PR_SWAP_SNK_SRC_SOURCE_ON, 0);
1751 break;
1752 case VCONN_SWAP_WAIT_FOR_VCONN:
1753 tcpm_set_state(port, VCONN_SWAP_TURN_OFF_VCONN, 0);
1754 break;
1755 default:
1756 break;
1757 }
1758 break;
1759 case PD_CTRL_REJECT:
1760 case PD_CTRL_WAIT:
64f7c494 1761 case PD_CTRL_NOT_SUPP:
f0690a25
GR		 1762 switch (port->state) {
1763 case SNK_NEGOTIATE_CAPABILITIES:
1764 /* USB PD specification, Figure 8-43 */
1765 if (port->explicit_contract)
1766 next_state = SNK_READY;
1767 else
1768 next_state = SNK_WAIT_CAPABILITIES;
1769 tcpm_set_state(port, next_state, 0);
1770 break;
2eadc33f
AT		 1771 case SNK_NEGOTIATE_PPS_CAPABILITIES:
1772 /* Revert data back from any requested PPS updates */
1773 port->pps_data.out_volt = port->supply_voltage;
1774 port->pps_data.op_curr = port->current_limit;
1775 port->pps_status = (type == PD_CTRL_WAIT ?
1776 -EAGAIN : -EOPNOTSUPP);
1777 tcpm_set_state(port, SNK_READY, 0);
1778 break;
f0690a25
GR		 1779 case DR_SWAP_SEND:
1780 port->swap_status = (type == PD_CTRL_WAIT ?
1781 -EAGAIN : -EOPNOTSUPP);
1782 tcpm_set_state(port, DR_SWAP_CANCEL, 0);
1783 break;
1784 case PR_SWAP_SEND:
1785 port->swap_status = (type == PD_CTRL_WAIT ?
1786 -EAGAIN : -EOPNOTSUPP);
1787 tcpm_set_state(port, PR_SWAP_CANCEL, 0);
1788 break;
1789 case VCONN_SWAP_SEND:
1790 port->swap_status = (type == PD_CTRL_WAIT ?
1791 -EAGAIN : -EOPNOTSUPP);
1792 tcpm_set_state(port, VCONN_SWAP_CANCEL, 0);
1793 break;
1794 default:
1795 break;
1796 }
1797 break;
1798 case PD_CTRL_ACCEPT:
1799 switch (port->state) {
1800 case SNK_NEGOTIATE_CAPABILITIES:
2eadc33f
AT		 1801 port->pps_data.active = false;
1802 tcpm_set_state(port, SNK_TRANSITION_SINK, 0);
1803 break;
1804 case SNK_NEGOTIATE_PPS_CAPABILITIES:
1805 port->pps_data.active = true;
1806 port->supply_voltage = port->pps_data.out_volt;
1807 port->current_limit = port->pps_data.op_curr;
f0690a25
GR		 1808 tcpm_set_state(port, SNK_TRANSITION_SINK, 0);
1809 break;
1810 case SOFT_RESET_SEND:
1811 port->message_id = 0;
5fec4b54 1812 port->rx_msgid = -1;
f0690a25
GR		 1813 if (port->pwr_role == TYPEC_SOURCE)
1814 next_state = SRC_SEND_CAPABILITIES;
1815 else
1816 next_state = SNK_WAIT_CAPABILITIES;
1817 tcpm_set_state(port, next_state, 0);
1818 break;
1819 case DR_SWAP_SEND:
1820 tcpm_set_state(port, DR_SWAP_CHANGE_DR, 0);
1821 break;
1822 case PR_SWAP_SEND:
1823 tcpm_set_state(port, PR_SWAP_START, 0);
1824 break;
1825 case VCONN_SWAP_SEND:
1826 tcpm_set_state(port, VCONN_SWAP_START, 0);
1827 break;
1828 default:
1829 break;
1830 }
1831 break;
1832 case PD_CTRL_SOFT_RESET:
1833 tcpm_set_state(port, SOFT_RESET, 0);
1834 break;
1835 case PD_CTRL_DR_SWAP:
9b0ae699 1836 if (port->port_type != TYPEC_PORT_DRP) {
f0690a25
GR		 1837 tcpm_queue_message(port, PD_MSG_CTRL_REJECT);
1838 break;
1839 }
1840 /*
1841 * XXX
1842 * 6.3.9: If an alternate mode is active, a request to swap
1843 * alternate modes shall trigger a port reset.
1844 */
1845 switch (port->state) {
1846 case SRC_READY:
1847 case SNK_READY:
1848 tcpm_set_state(port, DR_SWAP_ACCEPT, 0);
1849 break;
1850 default:
1851 tcpm_queue_message(port, PD_MSG_CTRL_WAIT);
1852 break;
1853 }
1854 break;
1855 case PD_CTRL_PR_SWAP:
9b0ae699 1856 if (port->port_type != TYPEC_PORT_DRP) {
f0690a25
GR		 1857 tcpm_queue_message(port, PD_MSG_CTRL_REJECT);
1858 break;
1859 }
1860 switch (port->state) {
1861 case SRC_READY:
1862 case SNK_READY:
1863 tcpm_set_state(port, PR_SWAP_ACCEPT, 0);
1864 break;
1865 default:
1866 tcpm_queue_message(port, PD_MSG_CTRL_WAIT);
1867 break;
1868 }
1869 break;
1870 case PD_CTRL_VCONN_SWAP:
1871 switch (port->state) {
1872 case SRC_READY:
1873 case SNK_READY:
1874 tcpm_set_state(port, VCONN_SWAP_ACCEPT, 0);
1875 break;
1876 default:
1877 tcpm_queue_message(port, PD_MSG_CTRL_WAIT);
1878 break;
1879 }
1880 break;
64f7c494
AT		 1881 case PD_CTRL_GET_SOURCE_CAP_EXT:
1882 case PD_CTRL_GET_STATUS:
1883 case PD_CTRL_FR_SWAP:
1884 case PD_CTRL_GET_PPS_STATUS:
1885 case PD_CTRL_GET_COUNTRY_CODES:
1886 /* Currently not supported */
1887 tcpm_queue_message(port, PD_MSG_CTRL_NOT_SUPP);
1888 break;
f0690a25
GR		 1889 default:
1890 tcpm_log(port, "Unhandled ctrl message type %#x", type);
1891 break;
1892 }
1893}
1894
64f7c494
AT		 1895static void tcpm_pd_ext_msg_request(struct tcpm_port *port,
1896 const struct pd_message *msg)
1897{
1898 enum pd_ext_msg_type type = pd_header_type_le(msg->header);
1899 unsigned int data_size = pd_ext_header_data_size_le(msg->ext_msg.header);
1900
25242703 1901 if (!(msg->ext_msg.header & PD_EXT_HDR_CHUNKED)) {
64f7c494
AT		 1902 tcpm_log(port, "Unchunked extended messages unsupported");
1903 return;
1904 }
1905
1906 if (data_size > PD_EXT_MAX_CHUNK_DATA) {
1907 tcpm_log(port, "Chunk handling not yet supported");
1908 return;
1909 }
1910
1911 switch (type) {
1912 case PD_EXT_STATUS:
1913 /*
1914 * If PPS related events raised then get PPS status to clear
1915 * (see USB PD 3.0 Spec, 6.5.2.4)
1916 */
1917 if (msg->ext_msg.data[USB_PD_EXT_SDB_EVENT_FLAGS] &
1918 USB_PD_EXT_SDB_PPS_EVENTS)
1919 tcpm_set_state(port, GET_PPS_STATUS_SEND, 0);
1920 else
1921 tcpm_set_state(port, ready_state(port), 0);
1922 break;
1923 case PD_EXT_PPS_STATUS:
1924 /*
1925 * For now the PPS status message is used to clear events
1926 * and nothing more.
1927 */
1928 tcpm_set_state(port, ready_state(port), 0);
1929 break;
1930 case PD_EXT_SOURCE_CAP_EXT:
1931 case PD_EXT_GET_BATT_CAP:
1932 case PD_EXT_GET_BATT_STATUS:
1933 case PD_EXT_BATT_CAP:
1934 case PD_EXT_GET_MANUFACTURER_INFO:
1935 case PD_EXT_MANUFACTURER_INFO:
1936 case PD_EXT_SECURITY_REQUEST:
1937 case PD_EXT_SECURITY_RESPONSE:
1938 case PD_EXT_FW_UPDATE_REQUEST:
1939 case PD_EXT_FW_UPDATE_RESPONSE:
1940 case PD_EXT_COUNTRY_INFO:
1941 case PD_EXT_COUNTRY_CODES:
1942 tcpm_queue_message(port, PD_MSG_CTRL_NOT_SUPP);
1943 break;
1944 default:
1945 tcpm_log(port, "Unhandled extended message type %#x", type);
1946 break;
1947 }
1948}
1949
f0690a25
GR		 1950static void tcpm_pd_rx_handler(struct work_struct *work)
1951{
1952 struct pd_rx_event *event = container_of(work,
1953 struct pd_rx_event, work);
1954 const struct pd_message *msg = &event->msg;
1955 unsigned int cnt = pd_header_cnt_le(msg->header);
1956 struct tcpm_port *port = event->port;
1957
1958 mutex_lock(&port->lock);
1959
1960 tcpm_log(port, "PD RX, header: %#x [%d]", le16_to_cpu(msg->header),
1961 port->attached);
1962
1963 if (port->attached) {
5fec4b54
GR		 1964 enum pd_ctrl_msg_type type = pd_header_type_le(msg->header);
1965 unsigned int msgid = pd_header_msgid_le(msg->header);
1966
1967 /*
1968 * USB PD standard, 6.6.1.2:
1969 * "... if MessageID value in a received Message is the
1970 * same as the stored value, the receiver shall return a
1971 * GoodCRC Message with that MessageID value and drop
1972 * the Message (this is a retry of an already received
1973 * Message). Note: this shall not apply to the Soft_Reset
1974 * Message which always has a MessageID value of zero."
1975 */
1976 if (msgid == port->rx_msgid && type != PD_CTRL_SOFT_RESET)
1977 goto done;
1978 port->rx_msgid = msgid;
1979
f0690a25
GR		 1980 /*
1981 * If both ends believe to be DFP/host, we have a data role
1982 * mismatch.
1983 */
1984 if (!!(le16_to_cpu(msg->header) & PD_HEADER_DATA_ROLE) ==
1985 (port->data_role == TYPEC_HOST)) {
1986 tcpm_log(port,
1987 "Data role mismatch, initiating error recovery");
1988 tcpm_set_state(port, ERROR_RECOVERY, 0);
1989 } else {
64f7c494
AT		 1990 if (msg->header & PD_HEADER_EXT_HDR)
1991 tcpm_pd_ext_msg_request(port, msg);
1992 else if (cnt)
f0690a25
GR		 1993 tcpm_pd_data_request(port, msg);
1994 else
1995 tcpm_pd_ctrl_request(port, msg);
1996 }
1997 }
1998
5fec4b54 1999done:
f0690a25
GR		 2000 mutex_unlock(&port->lock);
2001 kfree(event);
2002}
2003
2004void tcpm_pd_receive(struct tcpm_port *port, const struct pd_message *msg)
2005{
2006 struct pd_rx_event *event;
2007
2008 event = kzalloc(sizeof(*event), GFP_ATOMIC);
2009 if (!event)
2010 return;
2011
2012 INIT_WORK(&event->work, tcpm_pd_rx_handler);
2013 event->port = port;
2014 memcpy(&event->msg, msg, sizeof(*msg));
2015 queue_work(port->wq, &event->work);
2016}
2017EXPORT_SYMBOL_GPL(tcpm_pd_receive);
2018
2019static int tcpm_pd_send_control(struct tcpm_port *port,
2020 enum pd_ctrl_msg_type type)
2021{
2022 struct pd_message msg;
2023
2024 memset(&msg, 0, sizeof(msg));
2025 msg.header = PD_HEADER_LE(type, port->pwr_role,
2026 port->data_role,
2eadc33f 2027 port->negotiated_rev,
f0690a25
GR		 2028 port->message_id, 0);
2029
2030 return tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
2031}
2032
2033/*
2034 * Send queued message without affecting state.
2035 * Return true if state machine should go back to sleep,
2036 * false otherwise.
2037 */
2038static bool tcpm_send_queued_message(struct tcpm_port *port)
2039{
2040 enum pd_msg_request queued_message;
2041
2042 do {
2043 queued_message = port->queued_message;
2044 port->queued_message = PD_MSG_NONE;
2045
2046 switch (queued_message) {
2047 case PD_MSG_CTRL_WAIT:
2048 tcpm_pd_send_control(port, PD_CTRL_WAIT);
2049 break;
2050 case PD_MSG_CTRL_REJECT:
2051 tcpm_pd_send_control(port, PD_CTRL_REJECT);
2052 break;
64f7c494
AT		 2053 case PD_MSG_CTRL_NOT_SUPP:
2054 tcpm_pd_send_control(port, PD_CTRL_NOT_SUPP);
2055 break;
f0690a25
GR		 2056 case PD_MSG_DATA_SINK_CAP:
2057 tcpm_pd_send_sink_caps(port);
2058 break;
2059 case PD_MSG_DATA_SOURCE_CAP:
2060 tcpm_pd_send_source_caps(port);
2061 break;
2062 default:
2063 break;
2064 }
2065 } while (port->queued_message != PD_MSG_NONE);
2066
2067 if (port->delayed_state != INVALID_STATE) {
2068 if (time_is_after_jiffies(port->delayed_runtime)) {
2069 mod_delayed_work(port->wq, &port->state_machine,
2070 port->delayed_runtime - jiffies);
2071 return true;
2072 }
2073 port->delayed_state = INVALID_STATE;
2074 }
2075 return false;
2076}
2077
2078static int tcpm_pd_check_request(struct tcpm_port *port)
2079{
2080 u32 pdo, rdo = port->sink_request;
2081 unsigned int max, op, pdo_max, index;
2082 enum pd_pdo_type type;
2083
2084 index = rdo_index(rdo);
2085 if (!index || index > port->nr_src_pdo)
2086 return -EINVAL;
2087
2088 pdo = port->src_pdo[index - 1];
2089 type = pdo_type(pdo);
2090 switch (type) {
2091 case PDO_TYPE_FIXED:
2092 case PDO_TYPE_VAR:
2093 max = rdo_max_current(rdo);
2094 op = rdo_op_current(rdo);
2095 pdo_max = pdo_max_current(pdo);
2096
2097 if (op > pdo_max)
2098 return -EINVAL;
2099 if (max > pdo_max && !(rdo & RDO_CAP_MISMATCH))
2100 return -EINVAL;
2101
2102 if (type == PDO_TYPE_FIXED)
2103 tcpm_log(port,
2104 "Requested %u mV, %u mA for %u / %u mA",
2105 pdo_fixed_voltage(pdo), pdo_max, op, max);
2106 else
2107 tcpm_log(port,
2108 "Requested %u -> %u mV, %u mA for %u / %u mA",
2109 pdo_min_voltage(pdo), pdo_max_voltage(pdo),
2110 pdo_max, op, max);
2111 break;
2112 case PDO_TYPE_BATT:
2113 max = rdo_max_power(rdo);
2114 op = rdo_op_power(rdo);
2115 pdo_max = pdo_max_power(pdo);
2116
2117 if (op > pdo_max)
2118 return -EINVAL;
2119 if (max > pdo_max && !(rdo & RDO_CAP_MISMATCH))
2120 return -EINVAL;
2121 tcpm_log(port,
2122 "Requested %u -> %u mV, %u mW for %u / %u mW",
2123 pdo_min_voltage(pdo), pdo_max_voltage(pdo),
2124 pdo_max, op, max);
2125 break;
2126 default:
2127 return -EINVAL;
2128 }
2129
2130 port->op_vsafe5v = index == 1;
2131
2132 return 0;
2133}
2134
53fe0de9
LJ		 2135#define min_power(x, y) min(pdo_max_power(x), pdo_max_power(y))
2136#define min_current(x, y) min(pdo_max_current(x), pdo_max_current(y))
2137
2138static int tcpm_pd_select_pdo(struct tcpm_port *port, int *sink_pdo,
2139 int *src_pdo)
f0690a25 2140{
53fe0de9
LJ		 2141 unsigned int i, j, max_src_mv = 0, min_src_mv = 0, max_mw = 0,
2142 max_mv = 0, src_mw = 0, src_ma = 0, max_snk_mv = 0,
2143 min_snk_mv = 0;
f0690a25
GR		 2144 int ret = -EINVAL;
2145
2eadc33f 2146 port->pps_data.supported = false;
f2a8aa05 2147 port->usb_type = POWER_SUPPLY_USB_TYPE_PD;
2eadc33f 2148
f0690a25 2149 /*
53fe0de9
LJ		 2150 * Select the source PDO providing the most power which has a
2151 * matchig sink cap.
f0690a25
GR		 2152 */
2153 for (i = 0; i < port->nr_source_caps; i++) {
2154 u32 pdo = port->source_caps[i];
2155 enum pd_pdo_type type = pdo_type(pdo);
f0690a25 2156
2eadc33f
AT		 2157 switch (type) {
2158 case PDO_TYPE_FIXED:
53fe0de9
LJ		 2159 max_src_mv = pdo_fixed_voltage(pdo);
2160 min_src_mv = max_src_mv;
2eadc33f
AT		 2161 break;
2162 case PDO_TYPE_BATT:
2163 case PDO_TYPE_VAR:
53fe0de9
LJ		 2164 max_src_mv = pdo_max_voltage(pdo);
2165 min_src_mv = pdo_min_voltage(pdo);
2eadc33f
AT		 2166 break;
2167 case PDO_TYPE_APDO:
f2a8aa05 2168 if (pdo_apdo_type(pdo) == APDO_TYPE_PPS) {
2eadc33f 2169 port->pps_data.supported = true;
f2a8aa05
AT		 2170 port->usb_type =
2171 POWER_SUPPLY_USB_TYPE_PD_PPS;
2172 }
2eadc33f
AT		 2173 continue;
2174 default:
2175 tcpm_log(port, "Invalid source PDO type, ignoring");
2176 continue;
53fe0de9 2177 }
6f566af3 2178
2eadc33f
AT		 2179 switch (type) {
2180 case PDO_TYPE_FIXED:
2181 case PDO_TYPE_VAR:
53fe0de9
LJ		 2182 src_ma = pdo_max_current(pdo);
2183 src_mw = src_ma * min_src_mv / 1000;
2eadc33f
AT		 2184 break;
2185 case PDO_TYPE_BATT:
2186 src_mw = pdo_max_power(pdo);
2187 break;
2188 case PDO_TYPE_APDO:
2189 continue;
2190 default:
2191 tcpm_log(port, "Invalid source PDO type, ignoring");
2192 continue;
6f566af3
HG		 2193 }
2194
53fe0de9
LJ		 2195 for (j = 0; j < port->nr_snk_pdo; j++) {
2196 pdo = port->snk_pdo[j];
2197
2eadc33f
AT		 2198 switch (pdo_type(pdo)) {
2199 case PDO_TYPE_FIXED:
53fe0de9 2200 max_snk_mv = pdo_fixed_voltage(pdo);
2eadc33f
AT		 2201 min_snk_mv = max_snk_mv;
2202 break;
2203 case PDO_TYPE_BATT:
2204 case PDO_TYPE_VAR:
53fe0de9 2205 max_snk_mv = pdo_max_voltage(pdo);
2eadc33f
AT		 2206 min_snk_mv = pdo_min_voltage(pdo);
2207 break;
2208 case PDO_TYPE_APDO:
2209 continue;
2210 default:
2211 tcpm_log(port, "Invalid sink PDO type, ignoring");
2212 continue;
53fe0de9
LJ		 2213 }
2214
2215 if (max_src_mv <= max_snk_mv &&
2216 min_src_mv >= min_snk_mv) {
2217 /* Prefer higher voltages if available */
2218 if ((src_mw == max_mw && min_src_mv > max_mv) ||
2219 src_mw > max_mw) {
2220 *src_pdo = i;
2221 *sink_pdo = j;
2222 max_mw = src_mw;
2223 max_mv = min_src_mv;
2224 ret = 0;
2225 }
2226 }
f0690a25
GR		 2227 }
2228 }
2229
2230 return ret;
2231}
2232
2eadc33f
AT		 2233#define min_pps_apdo_current(x, y) \
2234 min(pdo_pps_apdo_max_current(x), pdo_pps_apdo_max_current(y))
2235
2236static unsigned int tcpm_pd_select_pps_apdo(struct tcpm_port *port)
2237{
2238 unsigned int i, j, max_mw = 0, max_mv = 0;
2239 unsigned int min_src_mv, max_src_mv, src_ma, src_mw;
8e4657c6 2240 unsigned int min_snk_mv, max_snk_mv;
c710d0bb
KT		 2241 unsigned int max_op_mv;
2242 u32 pdo, src, snk;
2eadc33f
AT		 2243 unsigned int src_pdo = 0, snk_pdo = 0;
2244
2245 /*
2246 * Select the source PPS APDO providing the most power while staying
2247 * within the board's limits. We skip the first PDO as this is always
2248 * 5V 3A.
2249 */
2250 for (i = 1; i < port->nr_source_caps; ++i) {
2251 pdo = port->source_caps[i];
2252
2253 switch (pdo_type(pdo)) {
2254 case PDO_TYPE_APDO:
2255 if (pdo_apdo_type(pdo) != APDO_TYPE_PPS) {
2256 tcpm_log(port, "Not PPS APDO (source), ignoring");
2257 continue;
2258 }
2259
2260 min_src_mv = pdo_pps_apdo_min_voltage(pdo);
2261 max_src_mv = pdo_pps_apdo_max_voltage(pdo);
2262 src_ma = pdo_pps_apdo_max_current(pdo);
2263 src_mw = (src_ma * max_src_mv) / 1000;
2264
2265 /*
2266 * Now search through the sink PDOs to find a matching
2267 * PPS APDO. Again skip the first sink PDO as this will
2268 * always be 5V 3A.
2269 */
c413767e 2270 for (j = 1; j < port->nr_snk_pdo; j++) {
2eadc33f
AT		 2271 pdo = port->snk_pdo[j];
2272
2273 switch (pdo_type(pdo)) {
2274 case PDO_TYPE_APDO:
2275 if (pdo_apdo_type(pdo) != APDO_TYPE_PPS) {
2276 tcpm_log(port,
2277 "Not PPS APDO (sink), ignoring");
2278 continue;
2279 }
2280
2281 min_snk_mv =
2282 pdo_pps_apdo_min_voltage(pdo);
2283 max_snk_mv =
2284 pdo_pps_apdo_max_voltage(pdo);
2eadc33f
AT		 2285 break;
2286 default:
2287 tcpm_log(port,
2288 "Not APDO type (sink), ignoring");
2289 continue;
2290 }
2291
c710d0bb
KT		 2292 if (min_src_mv <= max_snk_mv &&
2293 max_src_mv >= min_snk_mv) {
2294 max_op_mv = min(max_src_mv, max_snk_mv);
2295 src_mw = (max_op_mv * src_ma) / 1000;
2eadc33f
AT		 2296 /* Prefer higher voltages if available */
2297 if ((src_mw == max_mw &&
c710d0bb 2298 max_op_mv > max_mv) ||
2eadc33f
AT		 2299 src_mw > max_mw) {
2300 src_pdo = i;
2301 snk_pdo = j;
2302 max_mw = src_mw;
c710d0bb 2303 max_mv = max_op_mv;
2eadc33f
AT		 2304 }
2305 }
2306 }
2307
2308 break;
2309 default:
2310 tcpm_log(port, "Not APDO type (source), ignoring");
2311 continue;
2312 }
2313 }
2314
2315 if (src_pdo) {
c710d0bb
KT		 2316 src = port->source_caps[src_pdo];
2317 snk = port->snk_pdo[snk_pdo];
2318
2319 port->pps_data.min_volt = max(pdo_pps_apdo_min_voltage(src),
2320 pdo_pps_apdo_min_voltage(snk));
2321 port->pps_data.max_volt = min(pdo_pps_apdo_max_voltage(src),
2322 pdo_pps_apdo_max_voltage(snk));
2323 port->pps_data.max_curr = min_pps_apdo_current(src, snk);
2324 port->pps_data.out_volt = min(port->pps_data.max_volt,
a07ddce4
KT		 2325 max(port->pps_data.min_volt,
2326 port->pps_data.out_volt));
c710d0bb
KT		 2327 port->pps_data.op_curr = min(port->pps_data.max_curr,
2328 port->pps_data.op_curr);
2eadc33f
AT		 2329 }
2330
2331 return src_pdo;
2332}
2333
f0690a25
GR		 2334static int tcpm_pd_build_request(struct tcpm_port *port, u32 *rdo)
2335{
2336 unsigned int mv, ma, mw, flags;
2337 unsigned int max_ma, max_mw;
2338 enum pd_pdo_type type;
53fe0de9 2339 u32 pdo, matching_snk_pdo;
0c718676
GKH		 2340 int src_pdo_index = 0;
2341 int snk_pdo_index = 0;
53fe0de9 2342 int ret;
f0690a25 2343
53fe0de9
LJ		 2344 ret = tcpm_pd_select_pdo(port, &snk_pdo_index, &src_pdo_index);
2345 if (ret < 0)
2346 return ret;
2347
2348 pdo = port->source_caps[src_pdo_index];
2349 matching_snk_pdo = port->snk_pdo[snk_pdo_index];
f0690a25
GR		 2350 type = pdo_type(pdo);
2351
2eadc33f
AT		 2352 switch (type) {
2353 case PDO_TYPE_FIXED:
f0690a25 2354 mv = pdo_fixed_voltage(pdo);
2eadc33f
AT		 2355 break;
2356 case PDO_TYPE_BATT:
2357 case PDO_TYPE_VAR:
f0690a25 2358 mv = pdo_min_voltage(pdo);
2eadc33f
AT		 2359 break;
2360 default:
2361 tcpm_log(port, "Invalid PDO selected!");
2362 return -EINVAL;
2363 }
f0690a25 2364
53fe0de9 2365 /* Select maximum available current within the sink pdo's limit */
f0690a25 2366 if (type == PDO_TYPE_BATT) {
53fe0de9
LJ		 2367 mw = min_power(pdo, matching_snk_pdo);
2368 ma = 1000 * mw / mv;
f0690a25 2369 } else {
53fe0de9
LJ		 2370 ma = min_current(pdo, matching_snk_pdo);
2371 mw = ma * mv / 1000;
f0690a25 2372 }
f0690a25 2373
931693f9 2374 flags = RDO_USB_COMM | RDO_NO_SUSPEND;
f0690a25
GR		 2375
2376 /* Set mismatch bit if offered power is less than operating power */
f0690a25
GR		 2377 max_ma = ma;
2378 max_mw = mw;
2379 if (mw < port->operating_snk_mw) {
2380 flags |= RDO_CAP_MISMATCH;
53fe0de9
LJ		 2381 if (type == PDO_TYPE_BATT &&
2382 (pdo_max_power(matching_snk_pdo) > pdo_max_power(pdo)))
2383 max_mw = pdo_max_power(matching_snk_pdo);
2384 else if (pdo_max_current(matching_snk_pdo) >
2385 pdo_max_current(pdo))
2386 max_ma = pdo_max_current(matching_snk_pdo);
f0690a25
GR		 2387 }
2388
2389 tcpm_log(port, "cc=%d cc1=%d cc2=%d vbus=%d vconn=%s polarity=%d",
2390 port->cc_req, port->cc1, port->cc2, port->vbus_source,
2391 port->vconn_role == TYPEC_SOURCE ? "source" : "sink",
2392 port->polarity);
2393
2394 if (type == PDO_TYPE_BATT) {
53fe0de9 2395 *rdo = RDO_BATT(src_pdo_index + 1, mw, max_mw, flags);
f0690a25
GR		 2396
2397 tcpm_log(port, "Requesting PDO %d: %u mV, %u mW%s",
53fe0de9 2398 src_pdo_index, mv, mw,
f0690a25
GR		 2399 flags & RDO_CAP_MISMATCH ? " [mismatch]" : "");
2400 } else {
53fe0de9 2401 *rdo = RDO_FIXED(src_pdo_index + 1, ma, max_ma, flags);
f0690a25
GR		 2402
2403 tcpm_log(port, "Requesting PDO %d: %u mV, %u mA%s",
53fe0de9 2404 src_pdo_index, mv, ma,
f0690a25
GR		 2405 flags & RDO_CAP_MISMATCH ? " [mismatch]" : "");
2406 }
2407
2408 port->current_limit = ma;
2409 port->supply_voltage = mv;
2410
2411 return 0;
2412}
2413
2414static int tcpm_pd_send_request(struct tcpm_port *port)
2415{
2416 struct pd_message msg;
2417 int ret;
2418 u32 rdo;
2419
2420 ret = tcpm_pd_build_request(port, &rdo);
2421 if (ret < 0)
2422 return ret;
2423
2424 memset(&msg, 0, sizeof(msg));
2425 msg.header = PD_HEADER_LE(PD_DATA_REQUEST,
2426 port->pwr_role,
2427 port->data_role,
2eadc33f
AT		 2428 port->negotiated_rev,
2429 port->message_id, 1);
2430 msg.payload[0] = cpu_to_le32(rdo);
2431
2432 return tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
2433}
2434
2435static int tcpm_pd_build_pps_request(struct tcpm_port *port, u32 *rdo)
2436{
8e4657c6 2437 unsigned int out_mv, op_ma, op_mw, max_mv, max_ma, flags;
2eadc33f
AT		 2438 enum pd_pdo_type type;
2439 unsigned int src_pdo_index;
2440 u32 pdo;
2441
2442 src_pdo_index = tcpm_pd_select_pps_apdo(port);
2443 if (!src_pdo_index)
2444 return -EOPNOTSUPP;
2445
2446 pdo = port->source_caps[src_pdo_index];
2447 type = pdo_type(pdo);
2448
2449 switch (type) {
2450 case PDO_TYPE_APDO:
2451 if (pdo_apdo_type(pdo) != APDO_TYPE_PPS) {
2452 tcpm_log(port, "Invalid APDO selected!");
2453 return -EINVAL;
2454 }
2eadc33f
AT		 2455 max_mv = port->pps_data.max_volt;
2456 max_ma = port->pps_data.max_curr;
2457 out_mv = port->pps_data.out_volt;
2458 op_ma = port->pps_data.op_curr;
2459 break;
2460 default:
2461 tcpm_log(port, "Invalid PDO selected!");
2462 return -EINVAL;
2463 }
2464
2465 flags = RDO_USB_COMM | RDO_NO_SUSPEND;
2466
2467 op_mw = (op_ma * out_mv) / 1000;
2468 if (op_mw < port->operating_snk_mw) {
2469 /*
2470 * Try raising current to meet power needs. If that's not enough
2471 * then try upping the voltage. If that's still not enough
2472 * then we've obviously chosen a PPS APDO which really isn't
2473 * suitable so abandon ship.
2474 */
2475 op_ma = (port->operating_snk_mw * 1000) / out_mv;
2476 if ((port->operating_snk_mw * 1000) % out_mv)
2477 ++op_ma;
2478 op_ma += RDO_PROG_CURR_MA_STEP - (op_ma % RDO_PROG_CURR_MA_STEP);
2479
2480 if (op_ma > max_ma) {
2481 op_ma = max_ma;
2482 out_mv = (port->operating_snk_mw * 1000) / op_ma;
2483 if ((port->operating_snk_mw * 1000) % op_ma)
2484 ++out_mv;
2485 out_mv += RDO_PROG_VOLT_MV_STEP -
2486 (out_mv % RDO_PROG_VOLT_MV_STEP);
2487
2488 if (out_mv > max_mv) {
2489 tcpm_log(port, "Invalid PPS APDO selected!");
2490 return -EINVAL;
2491 }
2492 }
2493 }
2494
2495 tcpm_log(port, "cc=%d cc1=%d cc2=%d vbus=%d vconn=%s polarity=%d",
2496 port->cc_req, port->cc1, port->cc2, port->vbus_source,
2497 port->vconn_role == TYPEC_SOURCE ? "source" : "sink",
2498 port->polarity);
2499
2500 *rdo = RDO_PROG(src_pdo_index + 1, out_mv, op_ma, flags);
2501
2502 tcpm_log(port, "Requesting APDO %d: %u mV, %u mA",
2503 src_pdo_index, out_mv, op_ma);
2504
2505 port->pps_data.op_curr = op_ma;
2506 port->pps_data.out_volt = out_mv;
2507
2508 return 0;
2509}
2510
2511static int tcpm_pd_send_pps_request(struct tcpm_port *port)
2512{
2513 struct pd_message msg;
2514 int ret;
2515 u32 rdo;
2516
2517 ret = tcpm_pd_build_pps_request(port, &rdo);
2518 if (ret < 0)
2519 return ret;
2520
2521 memset(&msg, 0, sizeof(msg));
2522 msg.header = PD_HEADER_LE(PD_DATA_REQUEST,
2523 port->pwr_role,
2524 port->data_role,
2525 port->negotiated_rev,
f0690a25
GR		 2526 port->message_id, 1);
2527 msg.payload[0] = cpu_to_le32(rdo);
2528
2529 return tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
2530}
2531
2532static int tcpm_set_vbus(struct tcpm_port *port, bool enable)
2533{
2534 int ret;
2535
2536 if (enable && port->vbus_charge)
2537 return -EINVAL;
2538
2539 tcpm_log(port, "vbus:=%d charge=%d", enable, port->vbus_charge);
2540
2541 ret = port->tcpc->set_vbus(port->tcpc, enable, port->vbus_charge);
2542 if (ret < 0)
2543 return ret;
2544
2545 port->vbus_source = enable;
2546 return 0;
2547}
2548
2549static int tcpm_set_charge(struct tcpm_port *port, bool charge)
2550{
2551 int ret;
2552
2553 if (charge && port->vbus_source)
2554 return -EINVAL;
2555
2556 if (charge != port->vbus_charge) {
2557 tcpm_log(port, "vbus=%d charge:=%d", port->vbus_source, charge);
2558 ret = port->tcpc->set_vbus(port->tcpc, port->vbus_source,
2559 charge);
2560 if (ret < 0)
2561 return ret;
2562 }
2563 port->vbus_charge = charge;
2564 return 0;
2565}
2566
7893f9e1 2567static bool tcpm_start_toggling(struct tcpm_port *port, enum typec_cc_status cc)
f0690a25
GR		 2568{
2569 int ret;
2570
7893f9e1
HG		 2571 if (!port->tcpc->start_toggling)
2572 return false;
f0690a25 2573
7893f9e1
HG		 2574 tcpm_log_force(port, "Start toggling");
2575 ret = port->tcpc->start_toggling(port->tcpc, port->port_type, cc);
2576 return ret == 0;
f0690a25
GR		 2577}
2578
2579static void tcpm_set_cc(struct tcpm_port *port, enum typec_cc_status cc)
2580{
2581 tcpm_log(port, "cc:=%d", cc);
2582 port->cc_req = cc;
2583 port->tcpc->set_cc(port->tcpc, cc);
2584}
2585
2586static int tcpm_init_vbus(struct tcpm_port *port)
2587{
2588 int ret;
2589
2590 ret = port->tcpc->set_vbus(port->tcpc, false, false);
2591 port->vbus_source = false;
2592 port->vbus_charge = false;
2593 return ret;
2594}
2595
2596static int tcpm_init_vconn(struct tcpm_port *port)
2597{
2598 int ret;
2599
2600 ret = port->tcpc->set_vconn(port->tcpc, false);
2601 port->vconn_role = TYPEC_SINK;
2602 return ret;
2603}
2604
2605static void tcpm_typec_connect(struct tcpm_port *port)
2606{
2607 if (!port->connected) {
2608 /* Make sure we don't report stale identity information */
2609 memset(&port->partner_ident, 0, sizeof(port->partner_ident));
2610 port->partner_desc.usb_pd = port->pd_capable;
2611 if (tcpm_port_is_debug(port))
2612 port->partner_desc.accessory = TYPEC_ACCESSORY_DEBUG;
2613 else if (tcpm_port_is_audio(port))
2614 port->partner_desc.accessory = TYPEC_ACCESSORY_AUDIO;
2615 else
2616 port->partner_desc.accessory = TYPEC_ACCESSORY_NONE;
2617 port->partner = typec_register_partner(port->typec_port,
2618 &port->partner_desc);
2619 port->connected = true;
2620 }
2621}
2622
2623static int tcpm_src_attach(struct tcpm_port *port)
2624{
2625 enum typec_cc_polarity polarity =
2626 port->cc2 == TYPEC_CC_RD ? TYPEC_POLARITY_CC2
2627 : TYPEC_POLARITY_CC1;
2628 int ret;
2629
2630 if (port->attached)
2631 return 0;
2632
2633 ret = tcpm_set_polarity(port, polarity);
2634 if (ret < 0)
2635 return ret;
2636
2637 ret = tcpm_set_roles(port, true, TYPEC_SOURCE, TYPEC_HOST);
2638 if (ret < 0)
2639 return ret;
2640
2641 ret = port->tcpc->set_pd_rx(port->tcpc, true);
2642 if (ret < 0)
2643 goto out_disable_mux;
2644
2645 /*
2646 * USB Type-C specification, version 1.2,
2647 * chapter 4.5.2.2.8.1 (Attached.SRC Requirements)
2648 * Enable VCONN only if the non-RD port is set to RA.
2649 */
2650 if ((polarity == TYPEC_POLARITY_CC1 && port->cc2 == TYPEC_CC_RA) ||
2651 (polarity == TYPEC_POLARITY_CC2 && port->cc1 == TYPEC_CC_RA)) {
2652 ret = tcpm_set_vconn(port, true);
2653 if (ret < 0)
2654 goto out_disable_pd;
2655 }
2656
2657 ret = tcpm_set_vbus(port, true);
2658 if (ret < 0)
2659 goto out_disable_vconn;
2660
2661 port->pd_capable = false;
2662
2663 port->partner = NULL;
2664
2665 port->attached = true;
2666 port->send_discover = true;
2667
2668 return 0;
2669
2670out_disable_vconn:
2671 tcpm_set_vconn(port, false);
2672out_disable_pd:
2673 port->tcpc->set_pd_rx(port->tcpc, false);
2674out_disable_mux:
e9576fe8 2675 tcpm_mux_set(port, TYPEC_STATE_SAFE, USB_ROLE_NONE,
2000016c 2676 TYPEC_ORIENTATION_NONE);
f0690a25
GR		 2677 return ret;
2678}
2679
2680static void tcpm_typec_disconnect(struct tcpm_port *port)
2681{
2682 if (port->connected) {
2683 typec_unregister_partner(port->partner);
2684 port->partner = NULL;
2685 port->connected = false;
2686 }
2687}
2688
2689static void tcpm_unregister_altmodes(struct tcpm_port *port)
2690{
2691 struct pd_mode_data *modep = &port->mode_data;
2692 int i;
2693
2694 for (i = 0; i < modep->altmodes; i++) {
2695 typec_unregister_altmode(port->partner_altmode[i]);
2696 port->partner_altmode[i] = NULL;
2697 }
2698
2699 memset(modep, 0, sizeof(*modep));
2700}
2701
2702static void tcpm_reset_port(struct tcpm_port *port)
2703{
2704 tcpm_unregister_altmodes(port);
2705 tcpm_typec_disconnect(port);
2706 port->attached = false;
2707 port->pd_capable = false;
2eadc33f 2708 port->pps_data.supported = false;
f0690a25 2709
5fec4b54
GR		 2710 /*
2711 * First Rx ID should be 0; set this to a sentinel of -1 so that
2712 * we can check tcpm_pd_rx_handler() if we had seen it before.
2713 */
2714 port->rx_msgid = -1;
2715
f0690a25
GR		 2716 port->tcpc->set_pd_rx(port->tcpc, false);
2717 tcpm_init_vbus(port); /* also disables charging */
2718 tcpm_init_vconn(port);
2719 tcpm_set_current_limit(port, 0, 0);
2720 tcpm_set_polarity(port, TYPEC_POLARITY_CC1);
e9576fe8 2721 tcpm_mux_set(port, TYPEC_STATE_SAFE, USB_ROLE_NONE,
2000016c 2722 TYPEC_ORIENTATION_NONE);
f0690a25
GR		 2723 tcpm_set_attached_state(port, false);
2724 port->try_src_count = 0;
2725 port->try_snk_count = 0;
f2a8aa05
AT		 2726 port->usb_type = POWER_SUPPLY_USB_TYPE_C;
2727
2728 power_supply_changed(port->psy);
f0690a25
GR		 2729}
2730
2731static void tcpm_detach(struct tcpm_port *port)
2732{
2733 if (!port->attached)
2734 return;
2735
2736 if (tcpm_port_is_disconnected(port))
2737 port->hard_reset_count = 0;
2738
2739 tcpm_reset_port(port);
2740}
2741
2742static void tcpm_src_detach(struct tcpm_port *port)
2743{
2744 tcpm_detach(port);
2745}
2746
2747static int tcpm_snk_attach(struct tcpm_port *port)
2748{
2749 int ret;
2750
2751 if (port->attached)
2752 return 0;
2753
2754 ret = tcpm_set_polarity(port, port->cc2 != TYPEC_CC_OPEN ?
2755 TYPEC_POLARITY_CC2 : TYPEC_POLARITY_CC1);
2756 if (ret < 0)
2757 return ret;
2758
2759 ret = tcpm_set_roles(port, true, TYPEC_SINK, TYPEC_DEVICE);
2760 if (ret < 0)
2761 return ret;
2762
2763 port->pd_capable = false;
2764
2765 port->partner = NULL;
2766
2767 port->attached = true;
2768 port->send_discover = true;
2769
2770 return 0;
2771}
2772
2773static void tcpm_snk_detach(struct tcpm_port *port)
2774{
2775 tcpm_detach(port);
f0690a25
GR		 2776}
2777
2778static int tcpm_acc_attach(struct tcpm_port *port)
2779{
2780 int ret;
2781
2782 if (port->attached)
2783 return 0;
2784
2785 ret = tcpm_set_roles(port, true, TYPEC_SOURCE, TYPEC_HOST);
2786 if (ret < 0)
2787 return ret;
2788
2789 port->partner = NULL;
2790
2791 tcpm_typec_connect(port);
2792
2793 port->attached = true;
2794
2795 return 0;
2796}
2797
2798static void tcpm_acc_detach(struct tcpm_port *port)
2799{
2800 tcpm_detach(port);
2801}
2802
2803static inline enum tcpm_state hard_reset_state(struct tcpm_port *port)
2804{
2805 if (port->hard_reset_count < PD_N_HARD_RESET_COUNT)
2806 return HARD_RESET_SEND;
2807 if (port->pd_capable)
2808 return ERROR_RECOVERY;
2809 if (port->pwr_role == TYPEC_SOURCE)
2810 return SRC_UNATTACHED;
2811 if (port->state == SNK_WAIT_CAPABILITIES)
2812 return SNK_READY;
2813 return SNK_UNATTACHED;
2814}
2815
f0690a25
GR		 2816static inline enum tcpm_state unattached_state(struct tcpm_port *port)
2817{
13cb492c
BJS		 2818 if (port->port_type == TYPEC_PORT_DRP) {
2819 if (port->pwr_role == TYPEC_SOURCE)
2820 return SRC_UNATTACHED;
2821 else
2822 return SNK_UNATTACHED;
ceeb1625 2823 } else if (port->port_type == TYPEC_PORT_SRC) {
f0690a25 2824 return SRC_UNATTACHED;
13cb492c
BJS		 2825 }
2826
2827 return SNK_UNATTACHED;
f0690a25
GR		 2828}
2829
2830static void tcpm_check_send_discover(struct tcpm_port *port)
2831{
2832 if (port->data_role == TYPEC_HOST && port->send_discover &&
2833 port->pd_capable) {
2834 tcpm_send_vdm(port, USB_SID_PD, CMD_DISCOVER_IDENT, NULL, 0);
2835 port->send_discover = false;
2836 }
2837}
2838
2839static void tcpm_swap_complete(struct tcpm_port *port, int result)
2840{
2841 if (port->swap_pending) {
2842 port->swap_status = result;
2843 port->swap_pending = false;
b17dd571 2844 port->non_pd_role_swap = false;
f0690a25
GR		 2845 complete(&port->swap_complete);
2846 }
2847}
2848
53b70e5c 2849static enum typec_pwr_opmode tcpm_get_pwr_opmode(enum typec_cc_status cc)
fce042f0
BJS		 2850{
2851 switch (cc) {
2852 case TYPEC_CC_RP_1_5:
2853 return TYPEC_PWR_MODE_1_5A;
2854 case TYPEC_CC_RP_3_0:
2855 return TYPEC_PWR_MODE_3_0A;
2856 case TYPEC_CC_RP_DEF:
2857 default:
2858 return TYPEC_PWR_MODE_USB;
2859 }
2860}
2861
f0690a25
GR		 2862static void run_state_machine(struct tcpm_port *port)
2863{
2864 int ret;
fce042f0 2865 enum typec_pwr_opmode opmode;
131c7d12 2866 unsigned int msecs;
f0690a25
GR		 2867
2868 port->enter_state = port->state;
2869 switch (port->state) {
7893f9e1 2870 case TOGGLING:
f0690a25
GR		 2871 break;
2872 /* SRC states */
2873 case SRC_UNATTACHED:
b17dd571
GR		 2874 if (!port->non_pd_role_swap)
2875 tcpm_swap_complete(port, -ENOTCONN);
f0690a25 2876 tcpm_src_detach(port);
7893f9e1
HG		 2877 if (tcpm_start_toggling(port, tcpm_rp_cc(port))) {
2878 tcpm_set_state(port, TOGGLING, 0);
f0690a25
GR		 2879 break;
2880 }
2881 tcpm_set_cc(port, tcpm_rp_cc(port));
9b0ae699 2882 if (port->port_type == TYPEC_PORT_DRP)
f0690a25
GR		 2883 tcpm_set_state(port, SNK_UNATTACHED, PD_T_DRP_SNK);
2884 break;
2885 case SRC_ATTACH_WAIT:
2886 if (tcpm_port_is_debug(port))
2887 tcpm_set_state(port, DEBUG_ACC_ATTACHED,
2888 PD_T_CC_DEBOUNCE);
2889 else if (tcpm_port_is_audio(port))
2890 tcpm_set_state(port, AUDIO_ACC_ATTACHED,
2891 PD_T_CC_DEBOUNCE);
2892 else if (tcpm_port_is_source(port))
2893 tcpm_set_state(port,
2894 tcpm_try_snk(port) ? SNK_TRY
2895 : SRC_ATTACHED,
2896 PD_T_CC_DEBOUNCE);
2897 break;
2898
2899 case SNK_TRY:
2900 port->try_snk_count++;
2901 /*
2902 * Requirements:
2903 * - Do not drive vconn or vbus
2904 * - Terminate CC pins (both) to Rd
2905 * Action:
2906 * - Wait for tDRPTry (PD_T_DRP_TRY).
2907 * Until then, ignore any state changes.
2908 */
2909 tcpm_set_cc(port, TYPEC_CC_RD);
2910 tcpm_set_state(port, SNK_TRY_WAIT, PD_T_DRP_TRY);
2911 break;
2912 case SNK_TRY_WAIT:
a0a3e04e
BJS		 2913 if (tcpm_port_is_sink(port)) {
2914 tcpm_set_state(port, SNK_TRY_WAIT_DEBOUNCE, 0);
2915 } else {
2916 tcpm_set_state(port, SRC_TRYWAIT, 0);
2917 port->max_wait = 0;
2918 }
2919 break;
2920 case SNK_TRY_WAIT_DEBOUNCE:
2921 tcpm_set_state(port, SNK_TRY_WAIT_DEBOUNCE_CHECK_VBUS,
2922 PD_T_PD_DEBOUNCE);
2923 break;
2924 case SNK_TRY_WAIT_DEBOUNCE_CHECK_VBUS:
f0690a25
GR		 2925 if (port->vbus_present && tcpm_port_is_sink(port)) {
2926 tcpm_set_state(port, SNK_ATTACHED, 0);
a0a3e04e
BJS		 2927 } else {
2928 tcpm_set_state(port, SRC_TRYWAIT, 0);
02d5be46 2929 port->max_wait = 0;
f0690a25 2930 }
f0690a25
GR		 2931 break;
2932 case SRC_TRYWAIT:
2933 tcpm_set_cc(port, tcpm_rp_cc(port));
02d5be46
BJS		 2934 if (port->max_wait == 0) {
2935 port->max_wait = jiffies +
2936 msecs_to_jiffies(PD_T_DRP_TRY);
f0690a25
GR		 2937 tcpm_set_state(port, SRC_TRYWAIT_UNATTACHED,
2938 PD_T_DRP_TRY);
02d5be46
BJS		 2939 } else {
2940 if (time_is_after_jiffies(port->max_wait))
2941 tcpm_set_state(port, SRC_TRYWAIT_UNATTACHED,
2942 jiffies_to_msecs(port->max_wait -
2943 jiffies));
2944 else
2945 tcpm_set_state(port, SNK_UNATTACHED, 0);
2946 }
2947 break;
2948 case SRC_TRYWAIT_DEBOUNCE:
2949 tcpm_set_state(port, SRC_ATTACHED, PD_T_CC_DEBOUNCE);
f0690a25
GR		 2950 break;
2951 case SRC_TRYWAIT_UNATTACHED:
2952 tcpm_set_state(port, SNK_UNATTACHED, 0);
2953 break;
2954
2955 case SRC_ATTACHED:
2956 ret = tcpm_src_attach(port);
2957 tcpm_set_state(port, SRC_UNATTACHED,
2958 ret < 0 ? 0 : PD_T_PS_SOURCE_ON);
2959 break;
2960 case SRC_STARTUP:
fce042f0
BJS		 2961 opmode = tcpm_get_pwr_opmode(tcpm_rp_cc(port));
2962 typec_set_pwr_opmode(port->typec_port, opmode);
f0690a25
GR		 2963 port->pwr_opmode = TYPEC_PWR_MODE_USB;
2964 port->caps_count = 0;
2eadc33f 2965 port->negotiated_rev = PD_MAX_REV;
f0690a25 2966 port->message_id = 0;
5fec4b54 2967 port->rx_msgid = -1;
f0690a25
GR		 2968 port->explicit_contract = false;
2969 tcpm_set_state(port, SRC_SEND_CAPABILITIES, 0);
2970 break;
2971 case SRC_SEND_CAPABILITIES:
2972 port->caps_count++;
2973 if (port->caps_count > PD_N_CAPS_COUNT) {
2974 tcpm_set_state(port, SRC_READY, 0);
2975 break;
2976 }
2977 ret = tcpm_pd_send_source_caps(port);
2978 if (ret < 0) {
2979 tcpm_set_state(port, SRC_SEND_CAPABILITIES,
2980 PD_T_SEND_SOURCE_CAP);
2981 } else {
2982 /*
2983 * Per standard, we should clear the reset counter here.
2984 * However, that can result in state machine hang-ups.
2985 * Reset it only in READY state to improve stability.
2986 */
2987 /* port->hard_reset_count = 0; */
2988 port->caps_count = 0;
2989 port->pd_capable = true;
976daf9d 2990 tcpm_set_state_cond(port, SRC_SEND_CAPABILITIES_TIMEOUT,
f0690a25
GR		 2991 PD_T_SEND_SOURCE_CAP);
2992 }
2993 break;
976daf9d
HG		 2994 case SRC_SEND_CAPABILITIES_TIMEOUT:
2995 /*
2996 * Error recovery for a PD_DATA_SOURCE_CAP reply timeout.
2997 *
2998 * PD 2.0 sinks are supposed to accept src-capabilities with a
2999 * 3.0 header and simply ignore any src PDOs which the sink does
3000 * not understand such as PPS but some 2.0 sinks instead ignore
3001 * the entire PD_DATA_SOURCE_CAP message, causing contract
3002 * negotiation to fail.
3003 *
3004 * After PD_N_HARD_RESET_COUNT hard-reset attempts, we try
3005 * sending src-capabilities with a lower PD revision to
3006 * make these broken sinks work.
3007 */
3008 if (port->hard_reset_count < PD_N_HARD_RESET_COUNT) {
3009 tcpm_set_state(port, HARD_RESET_SEND, 0);
3010 } else if (port->negotiated_rev > PD_REV20) {
3011 port->negotiated_rev--;
3012 port->hard_reset_count = 0;
3013 tcpm_set_state(port, SRC_SEND_CAPABILITIES, 0);
3014 } else {
3015 tcpm_set_state(port, hard_reset_state(port), 0);
3016 }
3017 break;
f0690a25
GR		 3018 case SRC_NEGOTIATE_CAPABILITIES:
3019 ret = tcpm_pd_check_request(port);
3020 if (ret < 0) {
3021 tcpm_pd_send_control(port, PD_CTRL_REJECT);
3022 if (!port->explicit_contract) {
3023 tcpm_set_state(port,
3024 SRC_WAIT_NEW_CAPABILITIES, 0);
3025 } else {
3026 tcpm_set_state(port, SRC_READY, 0);
3027 }
3028 } else {
3029 tcpm_pd_send_control(port, PD_CTRL_ACCEPT);
3030 tcpm_set_state(port, SRC_TRANSITION_SUPPLY,
3031 PD_T_SRC_TRANSITION);
3032 }
3033 break;
3034 case SRC_TRANSITION_SUPPLY:
3035 /* XXX: regulator_set_voltage(vbus, ...) */
3036 tcpm_pd_send_control(port, PD_CTRL_PS_RDY);
3037 port->explicit_contract = true;
3038 typec_set_pwr_opmode(port->typec_port, TYPEC_PWR_MODE_PD);
3039 port->pwr_opmode = TYPEC_PWR_MODE_PD;
3040 tcpm_set_state_cond(port, SRC_READY, 0);
3041 break;
3042 case SRC_READY:
3043#if 1
3044 port->hard_reset_count = 0;
3045#endif
3046 port->try_src_count = 0;
3047
3113bf1a 3048 tcpm_swap_complete(port, 0);
f0690a25 3049 tcpm_typec_connect(port);
2eadc33f 3050
f0690a25
GR		 3051 tcpm_check_send_discover(port);
3052 /*
3053 * 6.3.5
3054 * Sending ping messages is not necessary if
3055 * - the source operates at vSafe5V
3056 * or
3057 * - The system is not operating in PD mode
3058 * or
3059 * - Both partners are connected using a Type-C connector
f451ac9e
BJS		 3060 *
3061 * There is no actual need to send PD messages since the local
3062 * port type-c and the spec does not clearly say whether PD is
3063 * possible when type-c is connected to Type-A/B
f0690a25 3064 */
f0690a25
GR		 3065 break;
3066 case SRC_WAIT_NEW_CAPABILITIES:
3067 /* Nothing to do... */
3068 break;
3069
3070 /* SNK states */
3071 case SNK_UNATTACHED:
b17dd571
GR		 3072 if (!port->non_pd_role_swap)
3073 tcpm_swap_complete(port, -ENOTCONN);
2eadc33f 3074 tcpm_pps_complete(port, -ENOTCONN);
f0690a25 3075 tcpm_snk_detach(port);
7893f9e1
HG		 3076 if (tcpm_start_toggling(port, TYPEC_CC_RD)) {
3077 tcpm_set_state(port, TOGGLING, 0);
f0690a25
GR		 3078 break;
3079 }
3080 tcpm_set_cc(port, TYPEC_CC_RD);
9b0ae699 3081 if (port->port_type == TYPEC_PORT_DRP)
f0690a25
GR		 3082 tcpm_set_state(port, SRC_UNATTACHED, PD_T_DRP_SRC);
3083 break;
3084 case SNK_ATTACH_WAIT:
3085 if ((port->cc1 == TYPEC_CC_OPEN &&
3086 port->cc2 != TYPEC_CC_OPEN) ||
3087 (port->cc1 != TYPEC_CC_OPEN &&
3088 port->cc2 == TYPEC_CC_OPEN))
3089 tcpm_set_state(port, SNK_DEBOUNCED,
3090 PD_T_CC_DEBOUNCE);
3091 else if (tcpm_port_is_disconnected(port))
3092 tcpm_set_state(port, SNK_UNATTACHED,
3093 PD_T_PD_DEBOUNCE);
3094 break;
3095 case SNK_DEBOUNCED:
3096 if (tcpm_port_is_disconnected(port))
3097 tcpm_set_state(port, SNK_UNATTACHED,
3098 PD_T_PD_DEBOUNCE);
3099 else if (port->vbus_present)
3100 tcpm_set_state(port,
3101 tcpm_try_src(port) ? SRC_TRY
3102 : SNK_ATTACHED,
3103 0);
3104 else
3105 /* Wait for VBUS, but not forever */
56277035 3106 tcpm_set_state(port, PORT_RESET, PD_T_PS_SOURCE_ON);
f0690a25
GR		 3107 break;
3108
3109 case SRC_TRY:
3110 port->try_src_count++;
3111 tcpm_set_cc(port, tcpm_rp_cc(port));
131c7d12
BJS		 3112 port->max_wait = 0;
3113 tcpm_set_state(port, SRC_TRY_WAIT, 0);
3114 break;
3115 case SRC_TRY_WAIT:
3116 if (port->max_wait == 0) {
3117 port->max_wait = jiffies +
3118 msecs_to_jiffies(PD_T_DRP_TRY);
3119 msecs = PD_T_DRP_TRY;
3120 } else {
3121 if (time_is_after_jiffies(port->max_wait))
3122 msecs = jiffies_to_msecs(port->max_wait -
3123 jiffies);
3124 else
3125 msecs = 0;
3126 }
3127 tcpm_set_state(port, SNK_TRYWAIT, msecs);
f0690a25
GR		 3128 break;
3129 case SRC_TRY_DEBOUNCE:
3130 tcpm_set_state(port, SRC_ATTACHED, PD_T_PD_DEBOUNCE);
3131 break;
3132 case SNK_TRYWAIT:
3133 tcpm_set_cc(port, TYPEC_CC_RD);
af450ebb 3134 tcpm_set_state(port, SNK_TRYWAIT_VBUS, PD_T_CC_DEBOUNCE);
f0690a25 3135 break;
af450ebb
BJS		 3136 case SNK_TRYWAIT_VBUS:
3137 /*
3138 * TCPM stays in this state indefinitely until VBUS
3139 * is detected as long as Rp is not detected for
3140 * more than a time period of tPDDebounce.
3141 */
3142 if (port->vbus_present && tcpm_port_is_sink(port)) {
f0690a25
GR		 3143 tcpm_set_state(port, SNK_ATTACHED, 0);
3144 break;
3145 }
af450ebb
BJS		 3146 if (!tcpm_port_is_sink(port))
3147 tcpm_set_state(port, SNK_TRYWAIT_DEBOUNCE, 0);
f0690a25 3148 break;
af450ebb
BJS		 3149 case SNK_TRYWAIT_DEBOUNCE:
3150 tcpm_set_state(port, SNK_UNATTACHED, PD_T_PD_DEBOUNCE);
f0690a25 3151 break;
f0690a25
GR		 3152 case SNK_ATTACHED:
3153 ret = tcpm_snk_attach(port);
3154 if (ret < 0)
3155 tcpm_set_state(port, SNK_UNATTACHED, 0);
3156 else
3157 tcpm_set_state(port, SNK_STARTUP, 0);
3158 break;
3159 case SNK_STARTUP:
fce042f0
BJS		 3160 opmode = tcpm_get_pwr_opmode(port->polarity ?
3161 port->cc2 : port->cc1);
3162 typec_set_pwr_opmode(port->typec_port, opmode);
f0690a25 3163 port->pwr_opmode = TYPEC_PWR_MODE_USB;
2eadc33f 3164 port->negotiated_rev = PD_MAX_REV;
f0690a25 3165 port->message_id = 0;
5fec4b54 3166 port->rx_msgid = -1;
f0690a25
GR		 3167 port->explicit_contract = false;
3168 tcpm_set_state(port, SNK_DISCOVERY, 0);
3169 break;
3170 case SNK_DISCOVERY:
3171 if (port->vbus_present) {
3172 tcpm_set_current_limit(port,
3173 tcpm_get_current_limit(port),
3174 5000);
3175 tcpm_set_charge(port, true);
3176 tcpm_set_state(port, SNK_WAIT_CAPABILITIES, 0);
3177 break;
3178 }
3179 /*
3180 * For DRP, timeouts differ. Also, handling is supposed to be
3181 * different and much more complex (dead battery detection;
3182 * see USB power delivery specification, section 8.3.3.6.1.5.1).
3183 */
3184 tcpm_set_state(port, hard_reset_state(port),
9b0ae699 3185 port->port_type == TYPEC_PORT_DRP ?
f0690a25
GR		 3186 PD_T_DB_DETECT : PD_T_NO_RESPONSE);
3187 break;
3188 case SNK_DISCOVERY_DEBOUNCE:
3189 tcpm_set_state(port, SNK_DISCOVERY_DEBOUNCE_DONE,
3190 PD_T_CC_DEBOUNCE);
3191 break;
3192 case SNK_DISCOVERY_DEBOUNCE_DONE:
3193 if (!tcpm_port_is_disconnected(port) &&
3194 tcpm_port_is_sink(port) &&
3195 time_is_after_jiffies(port->delayed_runtime)) {
3196 tcpm_set_state(port, SNK_DISCOVERY,
9578bcd0
DC		 3197 jiffies_to_msecs(port->delayed_runtime -
3198 jiffies));
f0690a25
GR		 3199 break;
3200 }
3201 tcpm_set_state(port, unattached_state(port), 0);
3202 break;
3203 case SNK_WAIT_CAPABILITIES:
3204 ret = port->tcpc->set_pd_rx(port->tcpc, true);
3205 if (ret < 0) {
3206 tcpm_set_state(port, SNK_READY, 0);
3207 break;
3208 }
3209 /*
3210 * If VBUS has never been low, and we time out waiting
3211 * for source cap, try a soft reset first, in case we
3212 * were already in a stable contract before this boot.
3213 * Do this only once.
3214 */
3215 if (port->vbus_never_low) {
3216 port->vbus_never_low = false;
3217 tcpm_set_state(port, SOFT_RESET_SEND,
3218 PD_T_SINK_WAIT_CAP);
3219 } else {
3220 tcpm_set_state(port, hard_reset_state(port),
3221 PD_T_SINK_WAIT_CAP);
3222 }
3223 break;
3224 case SNK_NEGOTIATE_CAPABILITIES:
3225 port->pd_capable = true;
3226 port->hard_reset_count = 0;
3227 ret = tcpm_pd_send_request(port);
3228 if (ret < 0) {
3229 /* Let the Source send capabilities again. */
3230 tcpm_set_state(port, SNK_WAIT_CAPABILITIES, 0);
3231 } else {
3232 tcpm_set_state_cond(port, hard_reset_state(port),
3233 PD_T_SENDER_RESPONSE);
3234 }
3235 break;
2eadc33f
AT		 3236 case SNK_NEGOTIATE_PPS_CAPABILITIES:
3237 ret = tcpm_pd_send_pps_request(port);
3238 if (ret < 0) {
3239 port->pps_status = ret;
3240 /*
3241 * If this was called due to updates to sink
3242 * capabilities, and pps is no longer valid, we should
3243 * safely fall back to a standard PDO.
3244 */
3245 if (port->update_sink_caps)
3246 tcpm_set_state(port, SNK_NEGOTIATE_CAPABILITIES, 0);
3247 else
3248 tcpm_set_state(port, SNK_READY, 0);
3249 } else {
3250 tcpm_set_state_cond(port, hard_reset_state(port),
3251 PD_T_SENDER_RESPONSE);
3252 }
3253 break;
f0690a25
GR		 3254 case SNK_TRANSITION_SINK:
3255 case SNK_TRANSITION_SINK_VBUS:
3256 tcpm_set_state(port, hard_reset_state(port),
3257 PD_T_PS_TRANSITION);
3258 break;
3259 case SNK_READY:
3260 port->try_snk_count = 0;
2eadc33f 3261 port->update_sink_caps = false;
8bf05746
BJS		 3262 if (port->explicit_contract) {
3263 typec_set_pwr_opmode(port->typec_port,
3264 TYPEC_PWR_MODE_PD);
3265 port->pwr_opmode = TYPEC_PWR_MODE_PD;
3266 }
f0690a25 3267
3113bf1a 3268 tcpm_swap_complete(port, 0);
f0690a25 3269 tcpm_typec_connect(port);
f0690a25 3270 tcpm_check_send_discover(port);
2eadc33f
AT		 3271 tcpm_pps_complete(port, port->pps_status);
3272
f2a8aa05
AT		 3273 power_supply_changed(port->psy);
3274
f0690a25
GR		 3275 break;
3276
3277 /* Accessory states */
3278 case ACC_UNATTACHED:
3279 tcpm_acc_detach(port);
3280 tcpm_set_state(port, SRC_UNATTACHED, 0);
3281 break;
3282 case DEBUG_ACC_ATTACHED:
3283 case AUDIO_ACC_ATTACHED:
3284 ret = tcpm_acc_attach(port);
3285 if (ret < 0)
3286 tcpm_set_state(port, ACC_UNATTACHED, 0);
3287 break;
3288 case AUDIO_ACC_DEBOUNCE:
3289 tcpm_set_state(port, ACC_UNATTACHED, PD_T_CC_DEBOUNCE);
3290 break;
3291
3292 /* Hard_Reset states */
3293 case HARD_RESET_SEND:
3294 tcpm_pd_transmit(port, TCPC_TX_HARD_RESET, NULL);
3295 tcpm_set_state(port, HARD_RESET_START, 0);
3296 break;
3297 case HARD_RESET_START:
3298 port->hard_reset_count++;
3299 port->tcpc->set_pd_rx(port->tcpc, false);
3300 tcpm_unregister_altmodes(port);
3301 port->send_discover = true;
3302 if (port->pwr_role == TYPEC_SOURCE)
3303 tcpm_set_state(port, SRC_HARD_RESET_VBUS_OFF,
3304 PD_T_PS_HARD_RESET);
3305 else
3306 tcpm_set_state(port, SNK_HARD_RESET_SINK_OFF, 0);
3307 break;
3308 case SRC_HARD_RESET_VBUS_OFF:
3309 tcpm_set_vconn(port, true);
3310 tcpm_set_vbus(port, false);
23b5f732
BJS		 3311 tcpm_set_roles(port, port->self_powered, TYPEC_SOURCE,
3312 TYPEC_HOST);
f0690a25
GR		 3313 tcpm_set_state(port, SRC_HARD_RESET_VBUS_ON, PD_T_SRC_RECOVER);
3314 break;
3315 case SRC_HARD_RESET_VBUS_ON:
3316 tcpm_set_vbus(port, true);
3317 port->tcpc->set_pd_rx(port->tcpc, true);
3318 tcpm_set_attached_state(port, true);
3319 tcpm_set_state(port, SRC_UNATTACHED, PD_T_PS_SOURCE_ON);
3320 break;
3321 case SNK_HARD_RESET_SINK_OFF:
2eadc33f 3322 memset(&port->pps_data, 0, sizeof(port->pps_data));
f0690a25 3323 tcpm_set_vconn(port, false);
157c0f2f
BJS		 3324 if (port->pd_capable)
3325 tcpm_set_charge(port, false);
23b5f732
BJS		 3326 tcpm_set_roles(port, port->self_powered, TYPEC_SINK,
3327 TYPEC_DEVICE);
f0690a25
GR		 3328 /*
3329 * VBUS may or may not toggle, depending on the adapter.
3330 * If it doesn't toggle, transition to SNK_HARD_RESET_SINK_ON
3331 * directly after timeout.
3332 */
3333 tcpm_set_state(port, SNK_HARD_RESET_SINK_ON, PD_T_SAFE_0V);
3334 break;
3335 case SNK_HARD_RESET_WAIT_VBUS:
3336 /* Assume we're disconnected if VBUS doesn't come back. */
3337 tcpm_set_state(port, SNK_UNATTACHED,
3338 PD_T_SRC_RECOVER_MAX + PD_T_SRC_TURN_ON);
3339 break;
3340 case SNK_HARD_RESET_SINK_ON:
3341 /* Note: There is no guarantee that VBUS is on in this state */
3342 /*
3343 * XXX:
3344 * The specification suggests that dual mode ports in sink
3345 * mode should transition to state PE_SRC_Transition_to_default.
3346 * See USB power delivery specification chapter 8.3.3.6.1.3.
3347 * This would mean to to
3348 * - turn off VCONN, reset power supply
3349 * - request hardware reset
3350 * - turn on VCONN
3351 * - Transition to state PE_Src_Startup
3352 * SNK only ports shall transition to state Snk_Startup
3353 * (see chapter 8.3.3.3.8).
3354 * Similar, dual-mode ports in source mode should transition
3355 * to PE_SNK_Transition_to_default.
3356 */
157c0f2f
BJS		 3357 if (port->pd_capable) {
3358 tcpm_set_current_limit(port,
3359 tcpm_get_current_limit(port),
3360 5000);
3361 tcpm_set_charge(port, true);
3362 }
f0690a25
GR		 3363 tcpm_set_attached_state(port, true);
3364 tcpm_set_state(port, SNK_STARTUP, 0);
3365 break;
3366
3367 /* Soft_Reset states */
3368 case SOFT_RESET:
3369 port->message_id = 0;
5fec4b54 3370 port->rx_msgid = -1;
f0690a25
GR		 3371 tcpm_pd_send_control(port, PD_CTRL_ACCEPT);
3372 if (port->pwr_role == TYPEC_SOURCE)
3373 tcpm_set_state(port, SRC_SEND_CAPABILITIES, 0);
3374 else
3375 tcpm_set_state(port, SNK_WAIT_CAPABILITIES, 0);
3376 break;
3377 case SOFT_RESET_SEND:
3378 port->message_id = 0;
5fec4b54 3379 port->rx_msgid = -1;
f0690a25
GR		 3380 if (tcpm_pd_send_control(port, PD_CTRL_SOFT_RESET))
3381 tcpm_set_state_cond(port, hard_reset_state(port), 0);
3382 else
3383 tcpm_set_state_cond(port, hard_reset_state(port),
3384 PD_T_SENDER_RESPONSE);
3385 break;
3386
3387 /* DR_Swap states */
3388 case DR_SWAP_SEND:
3389 tcpm_pd_send_control(port, PD_CTRL_DR_SWAP);
3390 tcpm_set_state_cond(port, DR_SWAP_SEND_TIMEOUT,
3391 PD_T_SENDER_RESPONSE);
3392 break;
3393 case DR_SWAP_ACCEPT:
3394 tcpm_pd_send_control(port, PD_CTRL_ACCEPT);
3395 tcpm_set_state_cond(port, DR_SWAP_CHANGE_DR, 0);
3396 break;
3397 case DR_SWAP_SEND_TIMEOUT:
3398 tcpm_swap_complete(port, -ETIMEDOUT);
3399 tcpm_set_state(port, ready_state(port), 0);
3400 break;
3401 case DR_SWAP_CHANGE_DR:
3402 if (port->data_role == TYPEC_HOST) {
3403 tcpm_unregister_altmodes(port);
3404 tcpm_set_roles(port, true, port->pwr_role,
3405 TYPEC_DEVICE);
3406 } else {
3407 tcpm_set_roles(port, true, port->pwr_role,
3408 TYPEC_HOST);
3409 port->send_discover = true;
3410 }
f0690a25
GR		 3411 tcpm_set_state(port, ready_state(port), 0);
3412 break;
3413
3414 /* PR_Swap states */
3415 case PR_SWAP_ACCEPT:
3416 tcpm_pd_send_control(port, PD_CTRL_ACCEPT);
3417 tcpm_set_state(port, PR_SWAP_START, 0);
3418 break;
3419 case PR_SWAP_SEND:
3420 tcpm_pd_send_control(port, PD_CTRL_PR_SWAP);
3421 tcpm_set_state_cond(port, PR_SWAP_SEND_TIMEOUT,
3422 PD_T_SENDER_RESPONSE);
3423 break;
3424 case PR_SWAP_SEND_TIMEOUT:
3425 tcpm_swap_complete(port, -ETIMEDOUT);
3426 tcpm_set_state(port, ready_state(port), 0);
3427 break;
3428 case PR_SWAP_START:
3429 if (port->pwr_role == TYPEC_SOURCE)
3430 tcpm_set_state(port, PR_SWAP_SRC_SNK_TRANSITION_OFF,
3431 PD_T_SRC_TRANSITION);
3432 else
3433 tcpm_set_state(port, PR_SWAP_SNK_SRC_SINK_OFF, 0);
3434 break;
3435 case PR_SWAP_SRC_SNK_TRANSITION_OFF:
3436 tcpm_set_vbus(port, false);
3437 port->explicit_contract = false;
b965b631 3438 /* allow time for Vbus discharge, must be < tSrcSwapStdby */
f0690a25 3439 tcpm_set_state(port, PR_SWAP_SRC_SNK_SOURCE_OFF,
b965b631 3440 PD_T_SRCSWAPSTDBY);
f0690a25
GR		 3441 break;
3442 case PR_SWAP_SRC_SNK_SOURCE_OFF:
3443 tcpm_set_cc(port, TYPEC_CC_RD);
b965b631
BJS		 3444 /* allow CC debounce */
3445 tcpm_set_state(port, PR_SWAP_SRC_SNK_SOURCE_OFF_CC_DEBOUNCED,
3446 PD_T_CC_DEBOUNCE);
3447 break;
3448 case PR_SWAP_SRC_SNK_SOURCE_OFF_CC_DEBOUNCED:
050161ea
GR		 3449 /*
3450 * USB-PD standard, 6.2.1.4, Port Power Role:
3451 * "During the Power Role Swap Sequence, for the initial Source
3452 * Port, the Port Power Role field shall be set to Sink in the
3453 * PS_RDY Message indicating that the initial Source’s power
3454 * supply is turned off"
3455 */
3456 tcpm_set_pwr_role(port, TYPEC_SINK);
f0690a25
GR		 3457 if (tcpm_pd_send_control(port, PD_CTRL_PS_RDY)) {
3458 tcpm_set_state(port, ERROR_RECOVERY, 0);
3459 break;
3460 }
3461 tcpm_set_state_cond(port, SNK_UNATTACHED, PD_T_PS_SOURCE_ON);
3462 break;
3463 case PR_SWAP_SRC_SNK_SINK_ON:
f0690a25
GR		 3464 tcpm_set_state(port, SNK_STARTUP, 0);
3465 break;
3466 case PR_SWAP_SNK_SRC_SINK_OFF:
3467 tcpm_set_charge(port, false);
3468 tcpm_set_state(port, hard_reset_state(port),
3469 PD_T_PS_SOURCE_OFF);
3470 break;
3471 case PR_SWAP_SNK_SRC_SOURCE_ON:
3472 tcpm_set_cc(port, tcpm_rp_cc(port));
3473 tcpm_set_vbus(port, true);
b965b631
BJS		 3474 /*
3475 * allow time VBUS ramp-up, must be < tNewSrc
3476 * Also, this window overlaps with CC debounce as well.
3477 * So, Wait for the max of two which is PD_T_NEWSRC
3478 */
3479 tcpm_set_state(port, PR_SWAP_SNK_SRC_SOURCE_ON_VBUS_RAMPED_UP,
3480 PD_T_NEWSRC);
3481 break;
3482 case PR_SWAP_SNK_SRC_SOURCE_ON_VBUS_RAMPED_UP:
050161ea
GR		 3483 /*
3484 * USB PD standard, 6.2.1.4:
3485 * "Subsequent Messages initiated by the Policy Engine,
3486 * such as the PS_RDY Message sent to indicate that Vbus
3487 * is ready, will have the Port Power Role field set to
3488 * Source."
3489 */
f0690a25 3490 tcpm_set_pwr_role(port, TYPEC_SOURCE);
050161ea 3491 tcpm_pd_send_control(port, PD_CTRL_PS_RDY);
f0690a25
GR		 3492 tcpm_set_state(port, SRC_STARTUP, 0);
3493 break;
3494
3495 case VCONN_SWAP_ACCEPT:
3496 tcpm_pd_send_control(port, PD_CTRL_ACCEPT);
3497 tcpm_set_state(port, VCONN_SWAP_START, 0);
3498 break;
3499 case VCONN_SWAP_SEND:
3500 tcpm_pd_send_control(port, PD_CTRL_VCONN_SWAP);
3501 tcpm_set_state(port, VCONN_SWAP_SEND_TIMEOUT,
3502 PD_T_SENDER_RESPONSE);
3503 break;
3504 case VCONN_SWAP_SEND_TIMEOUT:
3505 tcpm_swap_complete(port, -ETIMEDOUT);
3506 tcpm_set_state(port, ready_state(port), 0);
3507 break;
3508 case VCONN_SWAP_START:
3509 if (port->vconn_role == TYPEC_SOURCE)
3510 tcpm_set_state(port, VCONN_SWAP_WAIT_FOR_VCONN, 0);
3511 else
3512 tcpm_set_state(port, VCONN_SWAP_TURN_ON_VCONN, 0);
3513 break;
3514 case VCONN_SWAP_WAIT_FOR_VCONN:
3515 tcpm_set_state(port, hard_reset_state(port),
3516 PD_T_VCONN_SOURCE_ON);
3517 break;
3518 case VCONN_SWAP_TURN_ON_VCONN:
3519 tcpm_set_vconn(port, true);
3520 tcpm_pd_send_control(port, PD_CTRL_PS_RDY);
f0690a25
GR		 3521 tcpm_set_state(port, ready_state(port), 0);
3522 break;
3523 case VCONN_SWAP_TURN_OFF_VCONN:
3524 tcpm_set_vconn(port, false);
f0690a25
GR		 3525 tcpm_set_state(port, ready_state(port), 0);
3526 break;
3527
3528 case DR_SWAP_CANCEL:
3529 case PR_SWAP_CANCEL:
3530 case VCONN_SWAP_CANCEL:
3531 tcpm_swap_complete(port, port->swap_status);
3532 if (port->pwr_role == TYPEC_SOURCE)
3533 tcpm_set_state(port, SRC_READY, 0);
3534 else
3535 tcpm_set_state(port, SNK_READY, 0);
3536 break;
3537
3538 case BIST_RX:
3539 switch (BDO_MODE_MASK(port->bist_request)) {
3540 case BDO_MODE_CARRIER2:
3541 tcpm_pd_transmit(port, TCPC_TX_BIST_MODE_2, NULL);
3542 break;
3543 default:
3544 break;
3545 }
3546 /* Always switch to unattached state */
3547 tcpm_set_state(port, unattached_state(port), 0);
3548 break;
64f7c494
AT		 3549 case GET_STATUS_SEND:
3550 tcpm_pd_send_control(port, PD_CTRL_GET_STATUS);
3551 tcpm_set_state(port, GET_STATUS_SEND_TIMEOUT,
3552 PD_T_SENDER_RESPONSE);
3553 break;
3554 case GET_STATUS_SEND_TIMEOUT:
3555 tcpm_set_state(port, ready_state(port), 0);
3556 break;
3557 case GET_PPS_STATUS_SEND:
3558 tcpm_pd_send_control(port, PD_CTRL_GET_PPS_STATUS);
3559 tcpm_set_state(port, GET_PPS_STATUS_SEND_TIMEOUT,
3560 PD_T_SENDER_RESPONSE);
3561 break;
3562 case GET_PPS_STATUS_SEND_TIMEOUT:
3563 tcpm_set_state(port, ready_state(port), 0);
3564 break;
f0690a25
GR		 3565 case ERROR_RECOVERY:
3566 tcpm_swap_complete(port, -EPROTO);
2eadc33f 3567 tcpm_pps_complete(port, -EPROTO);
b17dd571
GR		 3568 tcpm_set_state(port, PORT_RESET, 0);
3569 break;
3570 case PORT_RESET:
f0690a25 3571 tcpm_reset_port(port);
f0690a25 3572 tcpm_set_cc(port, TYPEC_CC_OPEN);
b17dd571 3573 tcpm_set_state(port, PORT_RESET_WAIT_OFF,
f0690a25
GR		 3574 PD_T_ERROR_RECOVERY);
3575 break;
b17dd571 3576 case PORT_RESET_WAIT_OFF:
f0690a25
GR		 3577 tcpm_set_state(port,
3578 tcpm_default_state(port),
3579 port->vbus_present ? PD_T_PS_SOURCE_OFF : 0);
3580 break;
3581 default:
3582 WARN(1, "Unexpected port state %d\n", port->state);
3583 break;
3584 }
3585}
3586
3587static void tcpm_state_machine_work(struct work_struct *work)
3588{
3589 struct tcpm_port *port = container_of(work, struct tcpm_port,
3590 state_machine.work);
3591 enum tcpm_state prev_state;
3592
3593 mutex_lock(&port->lock);
3594 port->state_machine_running = true;
3595
3596 if (port->queued_message && tcpm_send_queued_message(port))
3597 goto done;
3598
3599 /* If we were queued due to a delayed state change, update it now */
3600 if (port->delayed_state) {
3601 tcpm_log(port, "state change %s -> %s [delayed %ld ms]",
3602 tcpm_states[port->state],
3603 tcpm_states[port->delayed_state], port->delay_ms);
3604 port->prev_state = port->state;
3605 port->state = port->delayed_state;
3606 port->delayed_state = INVALID_STATE;
3607 }
3608
3609 /*
3610 * Continue running as long as we have (non-delayed) state changes
3611 * to make.
3612 */
3613 do {
3614 prev_state = port->state;
3615 run_state_machine(port);
3616 if (port->queued_message)
3617 tcpm_send_queued_message(port);
3618 } while (port->state != prev_state && !port->delayed_state);
3619
3620done:
3621 port->state_machine_running = false;
3622 mutex_unlock(&port->lock);
3623}
3624
3625static void _tcpm_cc_change(struct tcpm_port *port, enum typec_cc_status cc1,
3626 enum typec_cc_status cc2)
3627{
3628 enum typec_cc_status old_cc1, old_cc2;
3629 enum tcpm_state new_state;
3630
3631 old_cc1 = port->cc1;
3632 old_cc2 = port->cc2;
3633 port->cc1 = cc1;
3634 port->cc2 = cc2;
3635
3636 tcpm_log_force(port,
3637 "CC1: %u -> %u, CC2: %u -> %u [state %s, polarity %d, %s]",
3638 old_cc1, cc1, old_cc2, cc2, tcpm_states[port->state],
3639 port->polarity,
3640 tcpm_port_is_disconnected(port) ? "disconnected"
3641 : "connected");
3642
3643 switch (port->state) {
7893f9e1 3644 case TOGGLING:
f0690a25
GR		 3645 if (tcpm_port_is_debug(port) || tcpm_port_is_audio(port) ||
3646 tcpm_port_is_source(port))
3647 tcpm_set_state(port, SRC_ATTACH_WAIT, 0);
3648 else if (tcpm_port_is_sink(port))
3649 tcpm_set_state(port, SNK_ATTACH_WAIT, 0);
3650 break;
3651 case SRC_UNATTACHED:
3652 case ACC_UNATTACHED:
3653 if (tcpm_port_is_debug(port) || tcpm_port_is_audio(port) ||
3654 tcpm_port_is_source(port))
3655 tcpm_set_state(port, SRC_ATTACH_WAIT, 0);
3656 break;
3657 case SRC_ATTACH_WAIT:
3658 if (tcpm_port_is_disconnected(port) ||
3659 tcpm_port_is_audio_detached(port))
3660 tcpm_set_state(port, SRC_UNATTACHED, 0);
3661 else if (cc1 != old_cc1 || cc2 != old_cc2)
3662 tcpm_set_state(port, SRC_ATTACH_WAIT, 0);
3663 break;
3664 case SRC_ATTACHED:
f3b73364
BJS		 3665 case SRC_SEND_CAPABILITIES:
3666 case SRC_READY:
3667 if (tcpm_port_is_disconnected(port) ||
3668 !tcpm_port_is_source(port))
f0690a25
GR		 3669 tcpm_set_state(port, SRC_UNATTACHED, 0);
3670 break;
f0690a25
GR		 3671 case SNK_UNATTACHED:
3672 if (tcpm_port_is_sink(port))
3673 tcpm_set_state(port, SNK_ATTACH_WAIT, 0);
3674 break;
3675 case SNK_ATTACH_WAIT:
3676 if ((port->cc1 == TYPEC_CC_OPEN &&
3677 port->cc2 != TYPEC_CC_OPEN) ||
3678 (port->cc1 != TYPEC_CC_OPEN &&
3679 port->cc2 == TYPEC_CC_OPEN))
3680 new_state = SNK_DEBOUNCED;
3681 else if (tcpm_port_is_disconnected(port))
3682 new_state = SNK_UNATTACHED;
3683 else
3684 break;
3685 if (new_state != port->delayed_state)
3686 tcpm_set_state(port, SNK_ATTACH_WAIT, 0);
3687 break;
3688 case SNK_DEBOUNCED:
3689 if (tcpm_port_is_disconnected(port))
3690 new_state = SNK_UNATTACHED;
3691 else if (port->vbus_present)
3692 new_state = tcpm_try_src(port) ? SRC_TRY : SNK_ATTACHED;
3693 else
3694 new_state = SNK_UNATTACHED;
3695 if (new_state != port->delayed_state)
3696 tcpm_set_state(port, SNK_DEBOUNCED, 0);
3697 break;
3698 case SNK_READY:
3699 if (tcpm_port_is_disconnected(port))
3700 tcpm_set_state(port, unattached_state(port), 0);
3701 else if (!port->pd_capable &&
3702 (cc1 != old_cc1 || cc2 != old_cc2))
3703 tcpm_set_current_limit(port,
3704 tcpm_get_current_limit(port),
3705 5000);
3706 break;
3707
3708 case AUDIO_ACC_ATTACHED:
3709 if (cc1 == TYPEC_CC_OPEN || cc2 == TYPEC_CC_OPEN)
3710 tcpm_set_state(port, AUDIO_ACC_DEBOUNCE, 0);
3711 break;
3712 case AUDIO_ACC_DEBOUNCE:
3713 if (tcpm_port_is_audio(port))
3714 tcpm_set_state(port, AUDIO_ACC_ATTACHED, 0);
3715 break;
3716
3717 case DEBUG_ACC_ATTACHED:
3718 if (cc1 == TYPEC_CC_OPEN || cc2 == TYPEC_CC_OPEN)
3719 tcpm_set_state(port, ACC_UNATTACHED, 0);
3720 break;
3721
3722 case SNK_TRY:
3723 /* Do nothing, waiting for timeout */
3724 break;
3725
3726 case SNK_DISCOVERY:
3727 /* CC line is unstable, wait for debounce */
3728 if (tcpm_port_is_disconnected(port))
3729 tcpm_set_state(port, SNK_DISCOVERY_DEBOUNCE, 0);
3730 break;
3731 case SNK_DISCOVERY_DEBOUNCE:
3732 break;
3733
3734 case SRC_TRYWAIT:
3735 /* Hand over to state machine if needed */
3736 if (!port->vbus_present && tcpm_port_is_source(port))
02d5be46
BJS		 3737 tcpm_set_state(port, SRC_TRYWAIT_DEBOUNCE, 0);
3738 break;
3739 case SRC_TRYWAIT_DEBOUNCE:
3740 if (port->vbus_present || !tcpm_port_is_source(port))
f0690a25
GR		 3741 tcpm_set_state(port, SRC_TRYWAIT, 0);
3742 break;
a0a3e04e
BJS		 3743 case SNK_TRY_WAIT_DEBOUNCE:
3744 if (!tcpm_port_is_sink(port)) {
3745 port->max_wait = 0;
3746 tcpm_set_state(port, SRC_TRYWAIT, 0);
f0690a25 3747 }
f0690a25 3748 break;
131c7d12 3749 case SRC_TRY_WAIT:
c79d92bd
BJS		 3750 if (tcpm_port_is_source(port))
3751 tcpm_set_state(port, SRC_TRY_DEBOUNCE, 0);
f0690a25
GR		 3752 break;
3753 case SRC_TRY_DEBOUNCE:
131c7d12 3754 tcpm_set_state(port, SRC_TRY_WAIT, 0);
f0690a25
GR		 3755 break;
3756 case SNK_TRYWAIT_DEBOUNCE:
af450ebb
BJS		 3757 if (tcpm_port_is_sink(port))
3758 tcpm_set_state(port, SNK_TRYWAIT_VBUS, 0);
3759 break;
3760 case SNK_TRYWAIT_VBUS:
3761 if (!tcpm_port_is_sink(port))
f0690a25
GR		 3762 tcpm_set_state(port, SNK_TRYWAIT_DEBOUNCE, 0);
3763 break;
af450ebb
BJS		 3764 case SNK_TRYWAIT:
3765 /* Do nothing, waiting for tCCDebounce */
3766 break;
f0690a25
GR		 3767 case PR_SWAP_SNK_SRC_SINK_OFF:
3768 case PR_SWAP_SRC_SNK_TRANSITION_OFF:
3769 case PR_SWAP_SRC_SNK_SOURCE_OFF:
b965b631
BJS		 3770 case PR_SWAP_SRC_SNK_SOURCE_OFF_CC_DEBOUNCED:
3771 case PR_SWAP_SNK_SRC_SOURCE_ON:
f0690a25 3772 /*
b965b631 3773 * CC state change is expected in PR_SWAP
f0690a25
GR		 3774 * Ignore it.
3775 */
3776 break;
3777
3778 default:
3779 if (tcpm_port_is_disconnected(port))
3780 tcpm_set_state(port, unattached_state(port), 0);
3781 break;
3782 }
3783}
3784
3785static void _tcpm_pd_vbus_on(struct tcpm_port *port)
3786{
f0690a25
GR		 3787 tcpm_log_force(port, "VBUS on");
3788 port->vbus_present = true;
3789 switch (port->state) {
3790 case SNK_TRANSITION_SINK_VBUS:
8bf05746 3791 port->explicit_contract = true;
f0690a25
GR		 3792 tcpm_set_state(port, SNK_READY, 0);
3793 break;
3794 case SNK_DISCOVERY:
3795 tcpm_set_state(port, SNK_DISCOVERY, 0);
3796 break;
3797
3798 case SNK_DEBOUNCED:
3799 tcpm_set_state(port, tcpm_try_src(port) ? SRC_TRY
3800 : SNK_ATTACHED,
3801 0);
3802 break;
3803 case SNK_HARD_RESET_WAIT_VBUS:
3804 tcpm_set_state(port, SNK_HARD_RESET_SINK_ON, 0);
3805 break;
3806 case SRC_ATTACHED:
3807 tcpm_set_state(port, SRC_STARTUP, 0);
3808 break;
3809 case SRC_HARD_RESET_VBUS_ON:
3810 tcpm_set_state(port, SRC_STARTUP, 0);
3811 break;
3812
3813 case SNK_TRY:
3814 /* Do nothing, waiting for timeout */
3815 break;
3816 case SRC_TRYWAIT:
02d5be46
BJS		 3817 /* Do nothing, Waiting for Rd to be detected */
3818 break;
3819 case SRC_TRYWAIT_DEBOUNCE:
3820 tcpm_set_state(port, SRC_TRYWAIT, 0);
f0690a25 3821 break;
a0a3e04e
BJS		 3822 case SNK_TRY_WAIT_DEBOUNCE:
3823 /* Do nothing, waiting for PD_DEBOUNCE to do be done */
f0690a25
GR		 3824 break;
3825 case SNK_TRYWAIT:
af450ebb
BJS		 3826 /* Do nothing, waiting for tCCDebounce */
3827 break;
3828 case SNK_TRYWAIT_VBUS:
3829 if (tcpm_port_is_sink(port))
3830 tcpm_set_state(port, SNK_ATTACHED, 0);
3831 break;
3832 case SNK_TRYWAIT_DEBOUNCE:
3833 /* Do nothing, waiting for Rp */
f0690a25 3834 break;
131c7d12
BJS		 3835 case SRC_TRY_WAIT:
3836 case SRC_TRY_DEBOUNCE:
3837 /* Do nothing, waiting for sink detection */
3838 break;
f0690a25
GR		 3839 default:
3840 break;
3841 }
3842}
3843
3844static void _tcpm_pd_vbus_off(struct tcpm_port *port)
3845{
f0690a25
GR		 3846 tcpm_log_force(port, "VBUS off");
3847 port->vbus_present = false;
3848 port->vbus_never_low = false;
3849 switch (port->state) {
3850 case SNK_HARD_RESET_SINK_OFF:
3851 tcpm_set_state(port, SNK_HARD_RESET_WAIT_VBUS, 0);
3852 break;
3853 case SRC_HARD_RESET_VBUS_OFF:
3854 tcpm_set_state(port, SRC_HARD_RESET_VBUS_ON, 0);
3855 break;
3856 case HARD_RESET_SEND:
3857 break;
3858
3859 case SNK_TRY:
3860 /* Do nothing, waiting for timeout */
3861 break;
3862 case SRC_TRYWAIT:
3863 /* Hand over to state machine if needed */
3864 if (tcpm_port_is_source(port))
02d5be46 3865 tcpm_set_state(port, SRC_TRYWAIT_DEBOUNCE, 0);
f0690a25 3866 break;
a0a3e04e
BJS		 3867 case SNK_TRY_WAIT_DEBOUNCE:
3868 /* Do nothing, waiting for PD_DEBOUNCE to do be done */
f0690a25 3869 break;
af450ebb 3870 case SNK_TRYWAIT:
f0690a25 3871 case SNK_TRYWAIT_VBUS:
af450ebb 3872 case SNK_TRYWAIT_DEBOUNCE:
f0690a25 3873 break;
f0690a25
GR		 3874 case SNK_ATTACH_WAIT:
3875 tcpm_set_state(port, SNK_UNATTACHED, 0);
3876 break;
3877
3878 case SNK_NEGOTIATE_CAPABILITIES:
3879 break;
3880
3881 case PR_SWAP_SRC_SNK_TRANSITION_OFF:
3882 tcpm_set_state(port, PR_SWAP_SRC_SNK_SOURCE_OFF, 0);
3883 break;
3884
3885 case PR_SWAP_SNK_SRC_SINK_OFF:
3886 /* Do nothing, expected */
3887 break;
3888
b17dd571 3889 case PORT_RESET_WAIT_OFF:
c749d4d0 3890 tcpm_set_state(port, tcpm_default_state(port), 0);
f0690a25 3891 break;
131c7d12
BJS		 3892 case SRC_TRY_WAIT:
3893 case SRC_TRY_DEBOUNCE:
3894 /* Do nothing, waiting for sink detection */
3895 break;
f0690a25
GR		 3896 default:
3897 if (port->pwr_role == TYPEC_SINK &&
3898 port->attached)
3899 tcpm_set_state(port, SNK_UNATTACHED, 0);
3900 break;
3901 }
3902}
3903
3904static void _tcpm_pd_hard_reset(struct tcpm_port *port)
3905{
3906 tcpm_log_force(port, "Received hard reset");
3907 /*
3908 * If we keep receiving hard reset requests, executing the hard reset
3909 * must have failed. Revert to error recovery if that happens.
3910 */
3911 tcpm_set_state(port,
3912 port->hard_reset_count < PD_N_HARD_RESET_COUNT ?
3913 HARD_RESET_START : ERROR_RECOVERY,
3914 0);
3915}
3916
3917static void tcpm_pd_event_handler(struct work_struct *work)
3918{
3919 struct tcpm_port *port = container_of(work, struct tcpm_port,
3920 event_work);
3921 u32 events;
3922
3923 mutex_lock(&port->lock);
3924
3925 spin_lock(&port->pd_event_lock);
3926 while (port->pd_events) {
3927 events = port->pd_events;
3928 port->pd_events = 0;
3929 spin_unlock(&port->pd_event_lock);
3930 if (events & TCPM_RESET_EVENT)
3931 _tcpm_pd_hard_reset(port);
3932 if (events & TCPM_VBUS_EVENT) {
3933 bool vbus;
3934
3935 vbus = port->tcpc->get_vbus(port->tcpc);
3936 if (vbus)
3937 _tcpm_pd_vbus_on(port);
3938 else
3939 _tcpm_pd_vbus_off(port);
3940 }
3941 if (events & TCPM_CC_EVENT) {
3942 enum typec_cc_status cc1, cc2;
3943
3944 if (port->tcpc->get_cc(port->tcpc, &cc1, &cc2) == 0)
3945 _tcpm_cc_change(port, cc1, cc2);
3946 }
3947 spin_lock(&port->pd_event_lock);
3948 }
3949 spin_unlock(&port->pd_event_lock);
3950 mutex_unlock(&port->lock);
3951}
3952
3953void tcpm_cc_change(struct tcpm_port *port)
3954{
3955 spin_lock(&port->pd_event_lock);
3956 port->pd_events |= TCPM_CC_EVENT;
3957 spin_unlock(&port->pd_event_lock);
3958 queue_work(port->wq, &port->event_work);
3959}
3960EXPORT_SYMBOL_GPL(tcpm_cc_change);
3961
3962void tcpm_vbus_change(struct tcpm_port *port)
3963{
3964 spin_lock(&port->pd_event_lock);
3965 port->pd_events |= TCPM_VBUS_EVENT;
3966 spin_unlock(&port->pd_event_lock);
3967 queue_work(port->wq, &port->event_work);
3968}
3969EXPORT_SYMBOL_GPL(tcpm_vbus_change);
3970
3971void tcpm_pd_hard_reset(struct tcpm_port *port)
3972{
3973 spin_lock(&port->pd_event_lock);
3974 port->pd_events = TCPM_RESET_EVENT;
3975 spin_unlock(&port->pd_event_lock);
3976 queue_work(port->wq, &port->event_work);
3977}
3978EXPORT_SYMBOL_GPL(tcpm_pd_hard_reset);
3979
3980static int tcpm_dr_set(const struct typec_capability *cap,
3981 enum typec_data_role data)
3982{
3983 struct tcpm_port *port = typec_cap_to_tcpm(cap);
3984 int ret;
3985
3986 mutex_lock(&port->swap_lock);
3987 mutex_lock(&port->lock);
3988
9b0ae699 3989 if (port->port_type != TYPEC_PORT_DRP) {
f0690a25
GR		 3990 ret = -EINVAL;
3991 goto port_unlock;
3992 }
3993 if (port->state != SRC_READY && port->state != SNK_READY) {
3994 ret = -EAGAIN;
3995 goto port_unlock;
3996 }
3997
3998 if (port->data_role == data) {
3999 ret = 0;
4000 goto port_unlock;
4001 }
4002
4003 /*
4004 * XXX
4005 * 6.3.9: If an alternate mode is active, a request to swap
4006 * alternate modes shall trigger a port reset.
4007 * Reject data role swap request in this case.
4008 */
4009
b17dd571
GR		 4010 if (!port->pd_capable) {
4011 /*
4012 * If the partner is not PD capable, reset the port to
4013 * trigger a role change. This can only work if a preferred
4014 * role is configured, and if it matches the requested role.
4015 */
4016 if (port->try_role == TYPEC_NO_PREFERRED_ROLE ||
4017 port->try_role == port->pwr_role) {
4018 ret = -EINVAL;
4019 goto port_unlock;
4020 }
4021 port->non_pd_role_swap = true;
4022 tcpm_set_state(port, PORT_RESET, 0);
4023 } else {
4024 tcpm_set_state(port, DR_SWAP_SEND, 0);
4025 }
4026
f0690a25
GR		 4027 port->swap_status = 0;
4028 port->swap_pending = true;
4029 reinit_completion(&port->swap_complete);
f0690a25
GR		 4030 mutex_unlock(&port->lock);
4031
9adf9f9e
GR		 4032 if (!wait_for_completion_timeout(&port->swap_complete,
4033 msecs_to_jiffies(PD_ROLE_SWAP_TIMEOUT)))
4034 ret = -ETIMEDOUT;
4035 else
4036 ret = port->swap_status;
f0690a25 4037
b17dd571 4038 port->non_pd_role_swap = false;
f0690a25
GR		 4039 goto swap_unlock;
4040
4041port_unlock:
4042 mutex_unlock(&port->lock);
4043swap_unlock:
4044 mutex_unlock(&port->swap_lock);
4045 return ret;
4046}
4047
4048static int tcpm_pr_set(const struct typec_capability *cap,
4049 enum typec_role role)
4050{
4051 struct tcpm_port *port = typec_cap_to_tcpm(cap);
4052 int ret;
4053
4054 mutex_lock(&port->swap_lock);
4055 mutex_lock(&port->lock);
4056
9b0ae699 4057 if (port->port_type != TYPEC_PORT_DRP) {
f0690a25
GR		 4058 ret = -EINVAL;
4059 goto port_unlock;
4060 }
4061 if (port->state != SRC_READY && port->state != SNK_READY) {
4062 ret = -EAGAIN;
4063 goto port_unlock;
4064 }
4065
4066 if (role == port->pwr_role) {
4067 ret = 0;
4068 goto port_unlock;
4069 }
4070
f0690a25
GR		 4071 port->swap_status = 0;
4072 port->swap_pending = true;
4073 reinit_completion(&port->swap_complete);
4074 tcpm_set_state(port, PR_SWAP_SEND, 0);
4075 mutex_unlock(&port->lock);
4076
9adf9f9e
GR		 4077 if (!wait_for_completion_timeout(&port->swap_complete,
4078 msecs_to_jiffies(PD_ROLE_SWAP_TIMEOUT)))
4079 ret = -ETIMEDOUT;
4080 else
4081 ret = port->swap_status;
f0690a25 4082
f0690a25
GR		 4083 goto swap_unlock;
4084
4085port_unlock:
4086 mutex_unlock(&port->lock);
4087swap_unlock:
4088 mutex_unlock(&port->swap_lock);
4089 return ret;
4090}
4091
4092static int tcpm_vconn_set(const struct typec_capability *cap,
4093 enum typec_role role)
4094{
4095 struct tcpm_port *port = typec_cap_to_tcpm(cap);
4096 int ret;
4097
4098 mutex_lock(&port->swap_lock);
4099 mutex_lock(&port->lock);
4100
4101 if (port->state != SRC_READY && port->state != SNK_READY) {
4102 ret = -EAGAIN;
4103 goto port_unlock;
4104 }
4105
4106 if (role == port->vconn_role) {
4107 ret = 0;
4108 goto port_unlock;
4109 }
4110
4111 port->swap_status = 0;
4112 port->swap_pending = true;
4113 reinit_completion(&port->swap_complete);
4114 tcpm_set_state(port, VCONN_SWAP_SEND, 0);
4115 mutex_unlock(&port->lock);
4116
9adf9f9e
GR		 4117 if (!wait_for_completion_timeout(&port->swap_complete,
4118 msecs_to_jiffies(PD_ROLE_SWAP_TIMEOUT)))
4119 ret = -ETIMEDOUT;
4120 else
4121 ret = port->swap_status;
f0690a25 4122
f0690a25
GR		 4123 goto swap_unlock;
4124
4125port_unlock:
4126 mutex_unlock(&port->lock);
4127swap_unlock:
4128 mutex_unlock(&port->swap_lock);
4129 return ret;
4130}
4131
4132static int tcpm_try_role(const struct typec_capability *cap, int role)
4133{
4134 struct tcpm_port *port = typec_cap_to_tcpm(cap);
4135 struct tcpc_dev *tcpc = port->tcpc;
4136 int ret = 0;
4137
4138 mutex_lock(&port->lock);
4139 if (tcpc->try_role)
4140 ret = tcpc->try_role(tcpc, role);
1957de95 4141 if (!ret && (!tcpc->config || !tcpc->config->try_role_hw))
f0690a25
GR		 4142 port->try_role = role;
4143 port->try_src_count = 0;
4144 port->try_snk_count = 0;
4145 mutex_unlock(&port->lock);
4146
4147 return ret;
4148}
4149
f2a8aa05 4150static int tcpm_pps_set_op_curr(struct tcpm_port *port, u16 op_curr)
2eadc33f
AT		 4151{
4152 unsigned int target_mw;
4153 int ret;
4154
4155 mutex_lock(&port->swap_lock);
4156 mutex_lock(&port->lock);
4157
4158 if (!port->pps_data.active) {
4159 ret = -EOPNOTSUPP;
4160 goto port_unlock;
4161 }
4162
4163 if (port->state != SNK_READY) {
4164 ret = -EAGAIN;
4165 goto port_unlock;
4166 }
4167
4168 if (op_curr > port->pps_data.max_curr) {
4169 ret = -EINVAL;
4170 goto port_unlock;
4171 }
4172
4173 target_mw = (op_curr * port->pps_data.out_volt) / 1000;
4174 if (target_mw < port->operating_snk_mw) {
4175 ret = -EINVAL;
4176 goto port_unlock;
4177 }
4178
554fab6d
AT		 4179 /* Round down operating current to align with PPS valid steps */
4180 op_curr = op_curr - (op_curr % RDO_PROG_CURR_MA_STEP);
4181
2eadc33f
AT		 4182 reinit_completion(&port->pps_complete);
4183 port->pps_data.op_curr = op_curr;
4184 port->pps_status = 0;
4185 port->pps_pending = true;
4186 tcpm_set_state(port, SNK_NEGOTIATE_PPS_CAPABILITIES, 0);
4187 mutex_unlock(&port->lock);
4188
4189 if (!wait_for_completion_timeout(&port->pps_complete,
4190 msecs_to_jiffies(PD_PPS_CTRL_TIMEOUT)))
4191 ret = -ETIMEDOUT;
4192 else
4193 ret = port->pps_status;
4194
4195 goto swap_unlock;
4196
4197port_unlock:
4198 mutex_unlock(&port->lock);
4199swap_unlock:
4200 mutex_unlock(&port->swap_lock);
4201
4202 return ret;
4203}
4204
f2a8aa05 4205static int tcpm_pps_set_out_volt(struct tcpm_port *port, u16 out_volt)
2eadc33f
AT		 4206{
4207 unsigned int target_mw;
4208 int ret;
4209
4210 mutex_lock(&port->swap_lock);
4211 mutex_lock(&port->lock);
4212
4213 if (!port->pps_data.active) {
4214 ret = -EOPNOTSUPP;
4215 goto port_unlock;
4216 }
4217
4218 if (port->state != SNK_READY) {
4219 ret = -EAGAIN;
4220 goto port_unlock;
4221 }
4222
4223 if (out_volt < port->pps_data.min_volt ||
4224 out_volt > port->pps_data.max_volt) {
4225 ret = -EINVAL;
4226 goto port_unlock;
4227 }
4228
4229 target_mw = (port->pps_data.op_curr * out_volt) / 1000;
4230 if (target_mw < port->operating_snk_mw) {
4231 ret = -EINVAL;
4232 goto port_unlock;
4233 }
4234
554fab6d
AT		 4235 /* Round down output voltage to align with PPS valid steps */
4236 out_volt = out_volt - (out_volt % RDO_PROG_VOLT_MV_STEP);
4237
2eadc33f
AT		 4238 reinit_completion(&port->pps_complete);
4239 port->pps_data.out_volt = out_volt;
4240 port->pps_status = 0;
4241 port->pps_pending = true;
4242 tcpm_set_state(port, SNK_NEGOTIATE_PPS_CAPABILITIES, 0);
4243 mutex_unlock(&port->lock);
4244
4245 if (!wait_for_completion_timeout(&port->pps_complete,
4246 msecs_to_jiffies(PD_PPS_CTRL_TIMEOUT)))
4247 ret = -ETIMEDOUT;
4248 else
4249 ret = port->pps_status;
4250
4251 goto swap_unlock;
4252
4253port_unlock:
4254 mutex_unlock(&port->lock);
4255swap_unlock:
4256 mutex_unlock(&port->swap_lock);
4257
4258 return ret;
4259}
4260
f2a8aa05 4261static int tcpm_pps_activate(struct tcpm_port *port, bool activate)
2eadc33f
AT		 4262{
4263 int ret = 0;
4264
4265 mutex_lock(&port->swap_lock);
4266 mutex_lock(&port->lock);
4267
4268 if (!port->pps_data.supported) {
4269 ret = -EOPNOTSUPP;
4270 goto port_unlock;
4271 }
4272
4273 /* Trying to deactivate PPS when already deactivated so just bail */
4274 if (!port->pps_data.active && !activate)
4275 goto port_unlock;
4276
4277 if (port->state != SNK_READY) {
4278 ret = -EAGAIN;
4279 goto port_unlock;
4280 }
4281
4282 reinit_completion(&port->pps_complete);
4283 port->pps_status = 0;
4284 port->pps_pending = true;
4285
4286 /* Trigger PPS request or move back to standard PDO contract */
4287 if (activate) {
4288 port->pps_data.out_volt = port->supply_voltage;
4289 port->pps_data.op_curr = port->current_limit;
4290 tcpm_set_state(port, SNK_NEGOTIATE_PPS_CAPABILITIES, 0);
4291 } else {
4292 tcpm_set_state(port, SNK_NEGOTIATE_CAPABILITIES, 0);
4293 }
4294 mutex_unlock(&port->lock);
4295
4296 if (!wait_for_completion_timeout(&port->pps_complete,
4297 msecs_to_jiffies(PD_PPS_CTRL_TIMEOUT)))
4298 ret = -ETIMEDOUT;
4299 else
4300 ret = port->pps_status;
4301
4302 goto swap_unlock;
4303
4304port_unlock:
4305 mutex_unlock(&port->lock);
4306swap_unlock:
4307 mutex_unlock(&port->swap_lock);
4308
4309 return ret;
4310}
4311
f0690a25
GR		 4312static void tcpm_init(struct tcpm_port *port)
4313{
4314 enum typec_cc_status cc1, cc2;
4315
4316 port->tcpc->init(port->tcpc);
4317
4318 tcpm_reset_port(port);
4319
4320 /*
4321 * XXX
4322 * Should possibly wait for VBUS to settle if it was enabled locally
4323 * since tcpm_reset_port() will disable VBUS.
4324 */
4325 port->vbus_present = port->tcpc->get_vbus(port->tcpc);
4326 if (port->vbus_present)
4327 port->vbus_never_low = true;
4328
4329 tcpm_set_state(port, tcpm_default_state(port), 0);
4330
4331 if (port->tcpc->get_cc(port->tcpc, &cc1, &cc2) == 0)
4332 _tcpm_cc_change(port, cc1, cc2);
4333
4334 /*
4335 * Some adapters need a clean slate at startup, and won't recover
4336 * otherwise. So do not try to be fancy and force a clean disconnect.
4337 */
b17dd571 4338 tcpm_set_state(port, PORT_RESET, 0);
f0690a25
GR		 4339}
4340
9b0ae699
BJS		 4341static int tcpm_port_type_set(const struct typec_capability *cap,
4342 enum typec_port_type type)
4343{
4344 struct tcpm_port *port = typec_cap_to_tcpm(cap);
4345
4346 mutex_lock(&port->lock);
4347 if (type == port->port_type)
4348 goto port_unlock;
4349
4350 port->port_type = type;
4351
4352 if (!port->connected) {
4353 tcpm_set_state(port, PORT_RESET, 0);
ceeb1625 4354 } else if (type == TYPEC_PORT_SNK) {
9b0ae699
BJS		 4355 if (!(port->pwr_role == TYPEC_SINK &&
4356 port->data_role == TYPEC_DEVICE))
4357 tcpm_set_state(port, PORT_RESET, 0);
ceeb1625 4358 } else if (type == TYPEC_PORT_SRC) {
9b0ae699
BJS		 4359 if (!(port->pwr_role == TYPEC_SOURCE &&
4360 port->data_role == TYPEC_HOST))
4361 tcpm_set_state(port, PORT_RESET, 0);
4362 }
4363
4364port_unlock:
4365 mutex_unlock(&port->lock);
4366 return 0;
4367}
4368
f0690a25
GR		 4369void tcpm_tcpc_reset(struct tcpm_port *port)
4370{
4371 mutex_lock(&port->lock);
4372 /* XXX: Maintain PD connection if possible? */
4373 tcpm_init(port);
4374 mutex_unlock(&port->lock);
4375}
4376EXPORT_SYMBOL_GPL(tcpm_tcpc_reset);
4377
4378static int tcpm_copy_pdos(u32 *dest_pdo, const u32 *src_pdo,
4379 unsigned int nr_pdo)
4380{
4381 unsigned int i;
4382
4383 if (nr_pdo > PDO_MAX_OBJECTS)
4384 nr_pdo = PDO_MAX_OBJECTS;
4385
4386 for (i = 0; i < nr_pdo; i++)
4387 dest_pdo[i] = src_pdo[i];
4388
4389 return nr_pdo;
4390}
4391
193a6801
GR		 4392static int tcpm_copy_vdos(u32 *dest_vdo, const u32 *src_vdo,
4393 unsigned int nr_vdo)
4394{
4395 unsigned int i;
4396
4397 if (nr_vdo > VDO_MAX_OBJECTS)
4398 nr_vdo = VDO_MAX_OBJECTS;
4399
4400 for (i = 0; i < nr_vdo; i++)
4401 dest_vdo[i] = src_vdo[i];
4402
4403 return nr_vdo;
4404}
4405
96232cbc
LJ		 4406static int tcpm_fw_get_caps(struct tcpm_port *port,
4407 struct fwnode_handle *fwnode)
4408{
4409 const char *cap_str;
4410 int ret;
4411 u32 mw;
4412
4413 if (!fwnode)
4414 return -EINVAL;
4415
4416 /* USB data support is optional */
4417 ret = fwnode_property_read_string(fwnode, "data-role", &cap_str);
4418 if (ret == 0) {
4419 port->typec_caps.data = typec_find_port_data_role(cap_str);
4420 if (port->typec_caps.data < 0)
4421 return -EINVAL;
4422 }
4423
4424 ret = fwnode_property_read_string(fwnode, "power-role", &cap_str);
4425 if (ret < 0)
4426 return ret;
4427
4428 port->typec_caps.type = typec_find_port_power_role(cap_str);
4429 if (port->typec_caps.type < 0)
4430 return -EINVAL;
4431 port->port_type = port->typec_caps.type;
4432
4433 if (port->port_type == TYPEC_PORT_SNK)
4434 goto sink;
4435
4436 /* Get source pdos */
4437 ret = fwnode_property_read_u32_array(fwnode, "source-pdos",
4438 NULL, 0);
4439 if (ret <= 0)
4440 return -EINVAL;
4441
4442 port->nr_src_pdo = min(ret, PDO_MAX_OBJECTS);
4443 ret = fwnode_property_read_u32_array(fwnode, "source-pdos",
4444 port->src_pdo, port->nr_src_pdo);
4445 if ((ret < 0) || tcpm_validate_caps(port, port->src_pdo,
4446 port->nr_src_pdo))
4447 return -EINVAL;
4448
4449 if (port->port_type == TYPEC_PORT_SRC)
4450 return 0;
4451
4452 /* Get the preferred power role for DRP */
4453 ret = fwnode_property_read_string(fwnode, "try-power-role", &cap_str);
4454 if (ret < 0)
4455 return ret;
4456
4457 port->typec_caps.prefer_role = typec_find_power_role(cap_str);
4458 if (port->typec_caps.prefer_role < 0)
4459 return -EINVAL;
4460sink:
4461 /* Get sink pdos */
4462 ret = fwnode_property_read_u32_array(fwnode, "sink-pdos",
4463 NULL, 0);
4464 if (ret <= 0)
4465 return -EINVAL;
4466
4467 port->nr_snk_pdo = min(ret, PDO_MAX_OBJECTS);
4468 ret = fwnode_property_read_u32_array(fwnode, "sink-pdos",
4469 port->snk_pdo, port->nr_snk_pdo);
4470 if ((ret < 0) || tcpm_validate_caps(port, port->snk_pdo,
4471 port->nr_snk_pdo))
4472 return -EINVAL;
4473
4474 if (fwnode_property_read_u32(fwnode, "op-sink-microwatt", &mw) < 0)
4475 return -EINVAL;
4476 port->operating_snk_mw = mw / 1000;
4477
23b5f732
BJS		 4478 port->self_powered = fwnode_property_read_bool(fwnode, "self-powered");
4479
96232cbc
LJ		 4480 return 0;
4481}
4482
f2a8aa05
AT		 4483/* Power Supply access to expose source power information */
4484enum tcpm_psy_online_states {
4485 TCPM_PSY_OFFLINE = 0,
4486 TCPM_PSY_FIXED_ONLINE,
4487 TCPM_PSY_PROG_ONLINE,
4488};
4489
4490static enum power_supply_property tcpm_psy_props[] = {
4491 POWER_SUPPLY_PROP_USB_TYPE,
4492 POWER_SUPPLY_PROP_ONLINE,
4493 POWER_SUPPLY_PROP_VOLTAGE_MIN,
4494 POWER_SUPPLY_PROP_VOLTAGE_MAX,
4495 POWER_SUPPLY_PROP_VOLTAGE_NOW,
4496 POWER_SUPPLY_PROP_CURRENT_MAX,
4497 POWER_SUPPLY_PROP_CURRENT_NOW,
4498};
4499
4500static int tcpm_psy_get_online(struct tcpm_port *port,
4501 union power_supply_propval *val)
4502{
4503 if (port->vbus_charge) {
4504 if (port->pps_data.active)
4505 val->intval = TCPM_PSY_PROG_ONLINE;
4506 else
4507 val->intval = TCPM_PSY_FIXED_ONLINE;
4508 } else {
4509 val->intval = TCPM_PSY_OFFLINE;
4510 }
4511
4512 return 0;
4513}
4514
4515static int tcpm_psy_get_voltage_min(struct tcpm_port *port,
4516 union power_supply_propval *val)
4517{
4518 if (port->pps_data.active)
4519 val->intval = port->pps_data.min_volt * 1000;
4520 else
4521 val->intval = port->supply_voltage * 1000;
4522
4523 return 0;
4524}
4525
4526static int tcpm_psy_get_voltage_max(struct tcpm_port *port,
4527 union power_supply_propval *val)
4528{
4529 if (port->pps_data.active)
4530 val->intval = port->pps_data.max_volt * 1000;
4531 else
4532 val->intval = port->supply_voltage * 1000;
4533
4534 return 0;
4535}
4536
4537static int tcpm_psy_get_voltage_now(struct tcpm_port *port,
4538 union power_supply_propval *val)
4539{
4540 val->intval = port->supply_voltage * 1000;
4541
4542 return 0;
4543}
4544
4545static int tcpm_psy_get_current_max(struct tcpm_port *port,
4546 union power_supply_propval *val)
4547{
4548 if (port->pps_data.active)
4549 val->intval = port->pps_data.max_curr * 1000;
4550 else
4551 val->intval = port->current_limit * 1000;
4552
4553 return 0;
4554}
4555
4556static int tcpm_psy_get_current_now(struct tcpm_port *port,
4557 union power_supply_propval *val)
4558{
4559 val->intval = port->current_limit * 1000;
4560
4561 return 0;
4562}
4563
4564static int tcpm_psy_get_prop(struct power_supply *psy,
4565 enum power_supply_property psp,
4566 union power_supply_propval *val)
4567{
4568 struct tcpm_port *port = power_supply_get_drvdata(psy);
4569 int ret = 0;
4570
4571 switch (psp) {
4572 case POWER_SUPPLY_PROP_USB_TYPE:
4573 val->intval = port->usb_type;
4574 break;
4575 case POWER_SUPPLY_PROP_ONLINE:
4576 ret = tcpm_psy_get_online(port, val);
4577 break;
4578 case POWER_SUPPLY_PROP_VOLTAGE_MIN:
4579 ret = tcpm_psy_get_voltage_min(port, val);
4580 break;
4581 case POWER_SUPPLY_PROP_VOLTAGE_MAX:
4582 ret = tcpm_psy_get_voltage_max(port, val);
4583 break;
4584 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
4585 ret = tcpm_psy_get_voltage_now(port, val);
4586 break;
4587 case POWER_SUPPLY_PROP_CURRENT_MAX:
4588 ret = tcpm_psy_get_current_max(port, val);
4589 break;
4590 case POWER_SUPPLY_PROP_CURRENT_NOW:
4591 ret = tcpm_psy_get_current_now(port, val);
4592 break;
4593 default:
4594 ret = -EINVAL;
4595 break;
4596 }
4597
4598 return ret;
4599}
4600
4601static int tcpm_psy_set_online(struct tcpm_port *port,
4602 const union power_supply_propval *val)
4603{
4604 int ret;
4605
4606 switch (val->intval) {
4607 case TCPM_PSY_FIXED_ONLINE:
4608 ret = tcpm_pps_activate(port, false);
4609 break;
4610 case TCPM_PSY_PROG_ONLINE:
4611 ret = tcpm_pps_activate(port, true);
4612 break;
4613 default:
4614 ret = -EINVAL;
4615 break;
4616 }
4617
4618 return ret;
4619}
4620
4621static int tcpm_psy_set_prop(struct power_supply *psy,
4622 enum power_supply_property psp,
4623 const union power_supply_propval *val)
4624{
4625 struct tcpm_port *port = power_supply_get_drvdata(psy);
4626 int ret;
4627
4628 switch (psp) {
4629 case POWER_SUPPLY_PROP_ONLINE:
4630 ret = tcpm_psy_set_online(port, val);
4631 break;
4632 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
4633 if (val->intval < port->pps_data.min_volt * 1000 ||
4634 val->intval > port->pps_data.max_volt * 1000)
4635 ret = -EINVAL;
4636 else
4637 ret = tcpm_pps_set_out_volt(port, val->intval / 1000);
4638 break;
4639 case POWER_SUPPLY_PROP_CURRENT_NOW:
4640 if (val->intval > port->pps_data.max_curr * 1000)
4641 ret = -EINVAL;
4642 else
4643 ret = tcpm_pps_set_op_curr(port, val->intval / 1000);
4644 break;
4645 default:
4646 ret = -EINVAL;
4647 break;
4648 }
4649
4650 return ret;
4651}
4652
4653static int tcpm_psy_prop_writeable(struct power_supply *psy,
4654 enum power_supply_property psp)
4655{
4656 switch (psp) {
4657 case POWER_SUPPLY_PROP_ONLINE:
4658 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
4659 case POWER_SUPPLY_PROP_CURRENT_NOW:
4660 return 1;
4661 default:
4662 return 0;
4663 }
4664}
4665
4666static enum power_supply_usb_type tcpm_psy_usb_types[] = {
4667 POWER_SUPPLY_USB_TYPE_C,
4668 POWER_SUPPLY_USB_TYPE_PD,
4669 POWER_SUPPLY_USB_TYPE_PD_PPS,
4670};
4671
4672static const char *tcpm_psy_name_prefix = "tcpm-source-psy-";
4673
4674static int devm_tcpm_psy_register(struct tcpm_port *port)
4675{
4676 struct power_supply_config psy_cfg = {};
4677 const char *port_dev_name = dev_name(port->dev);
4678 size_t psy_name_len = strlen(tcpm_psy_name_prefix) +
4679 strlen(port_dev_name) + 1;
4680 char *psy_name;
4681
4682 psy_cfg.drv_data = port;
c97a8cc1 4683 psy_cfg.fwnode = dev_fwnode(port->dev);
f2a8aa05
AT		 4684 psy_name = devm_kzalloc(port->dev, psy_name_len, GFP_KERNEL);
4685 if (!psy_name)
4686 return -ENOMEM;
4687
4688 snprintf(psy_name, psy_name_len, "%s%s", tcpm_psy_name_prefix,
4689 port_dev_name);
4690 port->psy_desc.name = psy_name;
4691 port->psy_desc.type = POWER_SUPPLY_TYPE_USB,
4692 port->psy_desc.usb_types = tcpm_psy_usb_types;
4693 port->psy_desc.num_usb_types = ARRAY_SIZE(tcpm_psy_usb_types);
4694 port->psy_desc.properties = tcpm_psy_props,
4695 port->psy_desc.num_properties = ARRAY_SIZE(tcpm_psy_props),
4696 port->psy_desc.get_property = tcpm_psy_get_prop,
4697 port->psy_desc.set_property = tcpm_psy_set_prop,
4698 port->psy_desc.property_is_writeable = tcpm_psy_prop_writeable,
4699
4700 port->usb_type = POWER_SUPPLY_USB_TYPE_C;
4701
4702 port->psy = devm_power_supply_register(port->dev, &port->psy_desc,
4703 &psy_cfg);
4704
4705 return PTR_ERR_OR_ZERO(port->psy);
4706}
4707
96232cbc
LJ		 4708static int tcpm_copy_caps(struct tcpm_port *port,
4709 const struct tcpc_config *tcfg)
4710{
4711 if (tcpm_validate_caps(port, tcfg->src_pdo, tcfg->nr_src_pdo) ||
4712 tcpm_validate_caps(port, tcfg->snk_pdo, tcfg->nr_snk_pdo))
4713 return -EINVAL;
4714
4715 port->nr_src_pdo = tcpm_copy_pdos(port->src_pdo, tcfg->src_pdo,
4716 tcfg->nr_src_pdo);
4717 port->nr_snk_pdo = tcpm_copy_pdos(port->snk_pdo, tcfg->snk_pdo,
4718 tcfg->nr_snk_pdo);
4719
4720 port->nr_snk_vdo = tcpm_copy_vdos(port->snk_vdo, tcfg->snk_vdo,
4721 tcfg->nr_snk_vdo);
4722
4723 port->operating_snk_mw = tcfg->operating_snk_mw;
4724
4725 port->typec_caps.prefer_role = tcfg->default_role;
4726 port->typec_caps.type = tcfg->type;
4727 port->typec_caps.data = tcfg->data;
1957de95 4728 port->self_powered = tcfg->self_powered;
96232cbc
LJ		 4729
4730 return 0;
4731}
4732
f0690a25
GR		 4733struct tcpm_port *tcpm_register_port(struct device *dev, struct tcpc_dev *tcpc)
4734{
4735 struct tcpm_port *port;
4736 int i, err;
4737
96232cbc 4738 if (!dev || !tcpc ||
f0690a25
GR		 4739 !tcpc->get_vbus || !tcpc->set_cc || !tcpc->get_cc ||
4740 !tcpc->set_polarity || !tcpc->set_vconn || !tcpc->set_vbus ||
4741 !tcpc->set_pd_rx || !tcpc->set_roles || !tcpc->pd_transmit)
4742 return ERR_PTR(-EINVAL);
4743
4744 port = devm_kzalloc(dev, sizeof(*port), GFP_KERNEL);
4745 if (!port)
4746 return ERR_PTR(-ENOMEM);
4747
4748 port->dev = dev;
4749 port->tcpc = tcpc;
4750
4751 mutex_init(&port->lock);
4752 mutex_init(&port->swap_lock);
4753
4754 port->wq = create_singlethread_workqueue(dev_name(dev));
4755 if (!port->wq)
4756 return ERR_PTR(-ENOMEM);
4757 INIT_DELAYED_WORK(&port->state_machine, tcpm_state_machine_work);
4758 INIT_DELAYED_WORK(&port->vdm_state_machine, vdm_state_machine_work);
4759 INIT_WORK(&port->event_work, tcpm_pd_event_handler);
4760
4761 spin_lock_init(&port->pd_event_lock);
4762
4763 init_completion(&port->tx_complete);
4764 init_completion(&port->swap_complete);
2eadc33f 4765 init_completion(&port->pps_complete);
5007e1b5 4766 tcpm_debugfs_init(port);
f0690a25 4767
96232cbc
LJ		 4768 err = tcpm_fw_get_caps(port, tcpc->fwnode);
4769 if ((err < 0) && tcpc->config)
4770 err = tcpm_copy_caps(port, tcpc->config);
4771 if (err < 0)
5007e1b5 4772 goto out_destroy_wq;
96232cbc
LJ		 4773
4774 if (!tcpc->config || !tcpc->config->try_role_hw)
4775 port->try_role = port->typec_caps.prefer_role;
f0690a25
GR		 4776 else
4777 port->try_role = TYPEC_NO_PREFERRED_ROLE;
4778
5e85a04c 4779 port->typec_caps.fwnode = tcpc->fwnode;
f0690a25 4780 port->typec_caps.revision = 0x0120; /* Type-C spec release 1.2 */
2eadc33f 4781 port->typec_caps.pd_revision = 0x0300; /* USB-PD spec release 3.0 */
f0690a25
GR		 4782 port->typec_caps.dr_set = tcpm_dr_set;
4783 port->typec_caps.pr_set = tcpm_pr_set;
4784 port->typec_caps.vconn_set = tcpm_vconn_set;
4785 port->typec_caps.try_role = tcpm_try_role;
9b0ae699 4786 port->typec_caps.port_type_set = tcpm_port_type_set;
f0690a25
GR		 4787
4788 port->partner_desc.identity = &port->partner_ident;
96232cbc 4789 port->port_type = port->typec_caps.type;
f0690a25 4790
2000016c
HG		 4791 port->role_sw = usb_role_switch_get(port->dev);
4792 if (IS_ERR(port->role_sw)) {
4793 err = PTR_ERR(port->role_sw);
4794 goto out_destroy_wq;
4795 }
4796
f2a8aa05
AT		 4797 err = devm_tcpm_psy_register(port);
4798 if (err)
9997ab35 4799 goto out_role_sw_put;
f2a8aa05 4800
f0690a25 4801 port->typec_port = typec_register_port(port->dev, &port->typec_caps);
cf6e06cd
HK		 4802 if (IS_ERR(port->typec_port)) {
4803 err = PTR_ERR(port->typec_port);
9997ab35 4804 goto out_role_sw_put;
f0690a25
GR		 4805 }
4806
96232cbc 4807 if (tcpc->config && tcpc->config->alt_modes) {
3c41dbde 4808 const struct typec_altmode_desc *paltmode = tcpc->config->alt_modes;
f0690a25
GR		 4809
4810 i = 0;
4811 while (paltmode->svid && i < ARRAY_SIZE(port->port_altmode)) {
cf6e06cd
HK		 4812 struct typec_altmode *alt;
4813
4814 alt = typec_port_register_altmode(port->typec_port,
4815 paltmode);
4816 if (IS_ERR(alt)) {
f0690a25
GR		 4817 tcpm_log(port,
4818 "%s: failed to register port alternate mode 0x%x",
4819 dev_name(dev), paltmode->svid);
4820 break;
4821 }
e9576fe8
HK		 4822 typec_altmode_set_drvdata(alt, port);
4823 alt->ops = &tcpm_altmode_ops;
cf6e06cd 4824 port->port_altmode[i] = alt;
f0690a25
GR		 4825 i++;
4826 paltmode++;
4827 }
4828 }
4829
f0690a25
GR		 4830 mutex_lock(&port->lock);
4831 tcpm_init(port);
4832 mutex_unlock(&port->lock);
4833
4834 tcpm_log(port, "%s: registered", dev_name(dev));
4835 return port;
4836
9997ab35 4837out_role_sw_put:
2000016c 4838 usb_role_switch_put(port->role_sw);
9997ab35
JL		 4839out_destroy_wq:
4840 tcpm_debugfs_exit(port);
f0690a25
GR		 4841 destroy_workqueue(port->wq);
4842 return ERR_PTR(err);
4843}
4844EXPORT_SYMBOL_GPL(tcpm_register_port);
4845
4846void tcpm_unregister_port(struct tcpm_port *port)
4847{
4848 int i;
4849
a6d5d230 4850 tcpm_reset_port(port);
f0690a25
GR		 4851 for (i = 0; i < ARRAY_SIZE(port->port_altmode); i++)
4852 typec_unregister_altmode(port->port_altmode[i]);
4853 typec_unregister_port(port->typec_port);
5671a460 4854 usb_role_switch_put(port->role_sw);
f0690a25
GR		 4855 tcpm_debugfs_exit(port);
4856 destroy_workqueue(port->wq);
4857}
4858EXPORT_SYMBOL_GPL(tcpm_unregister_port);
4859
4860MODULE_AUTHOR("Guenter Roeck <groeck@chromium.org>");
4861MODULE_DESCRIPTION("USB Type-C Port Manager");
4862MODULE_LICENSE("GPL");
Linux 6.x block layer and io_uring tree(s)