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staging: typec: tcpci: enable vbus detection
[linux-block.git] / drivers / usb / typec / 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>
f0690a25
GR		 29#include <linux/usb/typec.h>
30#include <linux/workqueue.h>
31
f0690a25
GR		 32#define FOREACH_STATE(S) \
33 S(INVALID_STATE), \
34 S(DRP_TOGGLING), \
35 S(SRC_UNATTACHED), \
36 S(SRC_ATTACH_WAIT), \
37 S(SRC_ATTACHED), \
38 S(SRC_STARTUP), \
39 S(SRC_SEND_CAPABILITIES), \
40 S(SRC_NEGOTIATE_CAPABILITIES), \
41 S(SRC_TRANSITION_SUPPLY), \
42 S(SRC_READY), \
43 S(SRC_WAIT_NEW_CAPABILITIES), \
44 \
45 S(SNK_UNATTACHED), \
46 S(SNK_ATTACH_WAIT), \
47 S(SNK_DEBOUNCED), \
48 S(SNK_ATTACHED), \
49 S(SNK_STARTUP), \
50 S(SNK_DISCOVERY), \
51 S(SNK_DISCOVERY_DEBOUNCE), \
52 S(SNK_DISCOVERY_DEBOUNCE_DONE), \
53 S(SNK_WAIT_CAPABILITIES), \
54 S(SNK_NEGOTIATE_CAPABILITIES), \
2eadc33f 55 S(SNK_NEGOTIATE_PPS_CAPABILITIES), \
f0690a25
GR		 56 S(SNK_TRANSITION_SINK), \
57 S(SNK_TRANSITION_SINK_VBUS), \
58 S(SNK_READY), \
59 \
60 S(ACC_UNATTACHED), \
61 S(DEBUG_ACC_ATTACHED), \
62 S(AUDIO_ACC_ATTACHED), \
63 S(AUDIO_ACC_DEBOUNCE), \
64 \
65 S(HARD_RESET_SEND), \
66 S(HARD_RESET_START), \
67 S(SRC_HARD_RESET_VBUS_OFF), \
68 S(SRC_HARD_RESET_VBUS_ON), \
69 S(SNK_HARD_RESET_SINK_OFF), \
70 S(SNK_HARD_RESET_WAIT_VBUS), \
71 S(SNK_HARD_RESET_SINK_ON), \
72 \
73 S(SOFT_RESET), \
74 S(SOFT_RESET_SEND), \
75 \
76 S(DR_SWAP_ACCEPT), \
77 S(DR_SWAP_SEND), \
78 S(DR_SWAP_SEND_TIMEOUT), \
79 S(DR_SWAP_CANCEL), \
80 S(DR_SWAP_CHANGE_DR), \
81 \
82 S(PR_SWAP_ACCEPT), \
83 S(PR_SWAP_SEND), \
84 S(PR_SWAP_SEND_TIMEOUT), \
85 S(PR_SWAP_CANCEL), \
86 S(PR_SWAP_START), \
87 S(PR_SWAP_SRC_SNK_TRANSITION_OFF), \
88 S(PR_SWAP_SRC_SNK_SOURCE_OFF), \
b965b631 89 S(PR_SWAP_SRC_SNK_SOURCE_OFF_CC_DEBOUNCED), \
f0690a25
GR		 90 S(PR_SWAP_SRC_SNK_SINK_ON), \
91 S(PR_SWAP_SNK_SRC_SINK_OFF), \
92 S(PR_SWAP_SNK_SRC_SOURCE_ON), \
b965b631 93 S(PR_SWAP_SNK_SRC_SOURCE_ON_VBUS_RAMPED_UP), \
f0690a25
GR		 94 \
95 S(VCONN_SWAP_ACCEPT), \
96 S(VCONN_SWAP_SEND), \
97 S(VCONN_SWAP_SEND_TIMEOUT), \
98 S(VCONN_SWAP_CANCEL), \
99 S(VCONN_SWAP_START), \
100 S(VCONN_SWAP_WAIT_FOR_VCONN), \
101 S(VCONN_SWAP_TURN_ON_VCONN), \
102 S(VCONN_SWAP_TURN_OFF_VCONN), \
103 \
104 S(SNK_TRY), \
105 S(SNK_TRY_WAIT), \
a0a3e04e
BJS		 106 S(SNK_TRY_WAIT_DEBOUNCE), \
107 S(SNK_TRY_WAIT_DEBOUNCE_CHECK_VBUS), \
f0690a25 108 S(SRC_TRYWAIT), \
02d5be46 109 S(SRC_TRYWAIT_DEBOUNCE), \
f0690a25
GR		 110 S(SRC_TRYWAIT_UNATTACHED), \
111 \
112 S(SRC_TRY), \
131c7d12 113 S(SRC_TRY_WAIT), \
f0690a25
GR		 114 S(SRC_TRY_DEBOUNCE), \
115 S(SNK_TRYWAIT), \
116 S(SNK_TRYWAIT_DEBOUNCE), \
117 S(SNK_TRYWAIT_VBUS), \
118 S(BIST_RX), \
119 \
64f7c494
AT		 120 S(GET_STATUS_SEND), \
121 S(GET_STATUS_SEND_TIMEOUT), \
122 S(GET_PPS_STATUS_SEND), \
123 S(GET_PPS_STATUS_SEND_TIMEOUT), \
124 \
f0690a25 125 S(ERROR_RECOVERY), \
b17dd571
GR		 126 S(PORT_RESET), \
127 S(PORT_RESET_WAIT_OFF)
f0690a25
GR		 128
129#define GENERATE_ENUM(e) e
130#define GENERATE_STRING(s) #s
131
132enum tcpm_state {
133 FOREACH_STATE(GENERATE_ENUM)
134};
135
136static const char * const tcpm_states[] = {
137 FOREACH_STATE(GENERATE_STRING)
138};
139
140enum vdm_states {
141 VDM_STATE_ERR_BUSY = -3,
142 VDM_STATE_ERR_SEND = -2,
143 VDM_STATE_ERR_TMOUT = -1,
144 VDM_STATE_DONE = 0,
145 /* Anything >0 represents an active state */
146 VDM_STATE_READY = 1,
147 VDM_STATE_BUSY = 2,
148 VDM_STATE_WAIT_RSP_BUSY = 3,
149};
150
151enum pd_msg_request {
152 PD_MSG_NONE = 0,
153 PD_MSG_CTRL_REJECT,
154 PD_MSG_CTRL_WAIT,
64f7c494 155 PD_MSG_CTRL_NOT_SUPP,
f0690a25
GR		 156 PD_MSG_DATA_SINK_CAP,
157 PD_MSG_DATA_SOURCE_CAP,
158};
159
160/* Events from low level driver */
161
162#define TCPM_CC_EVENT BIT(0)
163#define TCPM_VBUS_EVENT BIT(1)
164#define TCPM_RESET_EVENT BIT(2)
165
166#define LOG_BUFFER_ENTRIES 1024
167#define LOG_BUFFER_ENTRY_SIZE 128
168
169/* Alternate mode support */
170
171#define SVID_DISCOVERY_MAX 16
172
173struct pd_mode_data {
174 int svid_index; /* current SVID index */
175 int nsvids;
176 u16 svids[SVID_DISCOVERY_MAX];
177 int altmodes; /* number of alternate modes */
178 struct typec_altmode_desc altmode_desc[SVID_DISCOVERY_MAX];
179};
180
2eadc33f
AT		 181struct pd_pps_data {
182 u32 min_volt;
183 u32 max_volt;
184 u32 max_curr;
185 u32 out_volt;
186 u32 op_curr;
187 bool supported;
188 bool active;
189};
190
f0690a25
GR		 191struct tcpm_port {
192 struct device *dev;
193
194 struct mutex lock; /* tcpm state machine lock */
195 struct workqueue_struct *wq;
196
197 struct typec_capability typec_caps;
198 struct typec_port *typec_port;
199
200 struct tcpc_dev *tcpc;
2000016c 201 struct usb_role_switch *role_sw;
f0690a25
GR		 202
203 enum typec_role vconn_role;
204 enum typec_role pwr_role;
205 enum typec_data_role data_role;
206 enum typec_pwr_opmode pwr_opmode;
207
208 struct usb_pd_identity partner_ident;
209 struct typec_partner_desc partner_desc;
210 struct typec_partner *partner;
211
212 enum typec_cc_status cc_req;
213
214 enum typec_cc_status cc1;
215 enum typec_cc_status cc2;
216 enum typec_cc_polarity polarity;
217
218 bool attached;
219 bool connected;
9b0ae699 220 enum typec_port_type port_type;
f0690a25
GR		 221 bool vbus_present;
222 bool vbus_never_low;
223 bool vbus_source;
224 bool vbus_charge;
225
226 bool send_discover;
227 bool op_vsafe5v;
228
229 int try_role;
230 int try_snk_count;
231 int try_src_count;
232
233 enum pd_msg_request queued_message;
234
235 enum tcpm_state enter_state;
236 enum tcpm_state prev_state;
237 enum tcpm_state state;
238 enum tcpm_state delayed_state;
239 unsigned long delayed_runtime;
240 unsigned long delay_ms;
241
242 spinlock_t pd_event_lock;
243 u32 pd_events;
244
245 struct work_struct event_work;
246 struct delayed_work state_machine;
247 struct delayed_work vdm_state_machine;
248 bool state_machine_running;
249
250 struct completion tx_complete;
251 enum tcpm_transmit_status tx_status;
252
253 struct mutex swap_lock; /* swap command lock */
254 bool swap_pending;
b17dd571 255 bool non_pd_role_swap;
f0690a25
GR		 256 struct completion swap_complete;
257 int swap_status;
258
2eadc33f 259 unsigned int negotiated_rev;
f0690a25
GR		 260 unsigned int message_id;
261 unsigned int caps_count;
262 unsigned int hard_reset_count;
263 bool pd_capable;
264 bool explicit_contract;
5fec4b54 265 unsigned int rx_msgid;
f0690a25
GR		 266
267 /* Partner capabilities/requests */
268 u32 sink_request;
269 u32 source_caps[PDO_MAX_OBJECTS];
270 unsigned int nr_source_caps;
271 u32 sink_caps[PDO_MAX_OBJECTS];
272 unsigned int nr_sink_caps;
273
274 /* Local capabilities */
275 u32 src_pdo[PDO_MAX_OBJECTS];
276 unsigned int nr_src_pdo;
277 u32 snk_pdo[PDO_MAX_OBJECTS];
278 unsigned int nr_snk_pdo;
193a6801
GR		 279 u32 snk_vdo[VDO_MAX_OBJECTS];
280 unsigned int nr_snk_vdo;
f0690a25 281
f0690a25 282 unsigned int operating_snk_mw;
2eadc33f 283 bool update_sink_caps;
f0690a25
GR		 284
285 /* Requested current / voltage */
286 u32 current_limit;
287 u32 supply_voltage;
288
f2a8aa05
AT		 289 /* Used to export TA voltage and current */
290 struct power_supply *psy;
291 struct power_supply_desc psy_desc;
292 enum power_supply_usb_type usb_type;
293
f0690a25
GR		 294 u32 bist_request;
295
296 /* PD state for Vendor Defined Messages */
297 enum vdm_states vdm_state;
298 u32 vdm_retries;
299 /* next Vendor Defined Message to send */
300 u32 vdo_data[VDO_MAX_SIZE];
301 u8 vdo_count;
302 /* VDO to retry if UFP responder replied busy */
303 u32 vdo_retry;
304
2eadc33f
AT		 305 /* PPS */
306 struct pd_pps_data pps_data;
307 struct completion pps_complete;
308 bool pps_pending;
309 int pps_status;
f0690a25 310
2eadc33f 311 /* Alternate mode data */
f0690a25
GR		 312 struct pd_mode_data mode_data;
313 struct typec_altmode *partner_altmode[SVID_DISCOVERY_MAX];
314 struct typec_altmode *port_altmode[SVID_DISCOVERY_MAX];
315
02d5be46
BJS		 316 /* Deadline in jiffies to exit src_try_wait state */
317 unsigned long max_wait;
318
f0690a25
GR		 319#ifdef CONFIG_DEBUG_FS
320 struct dentry *dentry;
321 struct mutex logbuffer_lock; /* log buffer access lock */
322 int logbuffer_head;
323 int logbuffer_tail;
324 u8 *logbuffer[LOG_BUFFER_ENTRIES];
325#endif
326};
327
328struct pd_rx_event {
329 struct work_struct work;
330 struct tcpm_port *port;
331 struct pd_message msg;
332};
333
334#define tcpm_cc_is_sink(cc) \
335 ((cc) == TYPEC_CC_RP_DEF || (cc) == TYPEC_CC_RP_1_5 || \
336 (cc) == TYPEC_CC_RP_3_0)
337
338#define tcpm_port_is_sink(port) \
339 ((tcpm_cc_is_sink((port)->cc1) && !tcpm_cc_is_sink((port)->cc2)) || \
340 (tcpm_cc_is_sink((port)->cc2) && !tcpm_cc_is_sink((port)->cc1)))
341
342#define tcpm_cc_is_source(cc) ((cc) == TYPEC_CC_RD)
343#define tcpm_cc_is_audio(cc) ((cc) == TYPEC_CC_RA)
344#define tcpm_cc_is_open(cc) ((cc) == TYPEC_CC_OPEN)
345
346#define tcpm_port_is_source(port) \
347 ((tcpm_cc_is_source((port)->cc1) && \
348 !tcpm_cc_is_source((port)->cc2)) || \
349 (tcpm_cc_is_source((port)->cc2) && \
350 !tcpm_cc_is_source((port)->cc1)))
351
352#define tcpm_port_is_debug(port) \
353 (tcpm_cc_is_source((port)->cc1) && tcpm_cc_is_source((port)->cc2))
354
355#define tcpm_port_is_audio(port) \
356 (tcpm_cc_is_audio((port)->cc1) && tcpm_cc_is_audio((port)->cc2))
357
358#define tcpm_port_is_audio_detached(port) \
359 ((tcpm_cc_is_audio((port)->cc1) && tcpm_cc_is_open((port)->cc2)) || \
360 (tcpm_cc_is_audio((port)->cc2) && tcpm_cc_is_open((port)->cc1)))
361
362#define tcpm_try_snk(port) \
ff6c8cb1
BJS		 363 ((port)->try_snk_count == 0 && (port)->try_role == TYPEC_SINK && \
364 (port)->port_type == TYPEC_PORT_DRP)
f0690a25
GR		 365
366#define tcpm_try_src(port) \
ff6c8cb1
BJS		 367 ((port)->try_src_count == 0 && (port)->try_role == TYPEC_SOURCE && \
368 (port)->port_type == TYPEC_PORT_DRP)
f0690a25
GR		 369
370static enum tcpm_state tcpm_default_state(struct tcpm_port *port)
371{
9b0ae699 372 if (port->port_type == TYPEC_PORT_DRP) {
b46a9c90
BJS		 373 if (port->try_role == TYPEC_SINK)
374 return SNK_UNATTACHED;
375 else if (port->try_role == TYPEC_SOURCE)
376 return SRC_UNATTACHED;
377 else if (port->tcpc->config->default_role == TYPEC_SINK)
378 return SNK_UNATTACHED;
379 /* Fall through to return SRC_UNATTACHED */
ceeb1625 380 } else if (port->port_type == TYPEC_PORT_SNK) {
f0690a25 381 return SNK_UNATTACHED;
b46a9c90 382 }
f0690a25
GR		 383 return SRC_UNATTACHED;
384}
385
386static inline
387struct tcpm_port *typec_cap_to_tcpm(const struct typec_capability *cap)
388{
389 return container_of(cap, struct tcpm_port, typec_caps);
390}
391
392static bool tcpm_port_is_disconnected(struct tcpm_port *port)
393{
394 return (!port->attached && port->cc1 == TYPEC_CC_OPEN &&
395 port->cc2 == TYPEC_CC_OPEN) ||
396 (port->attached && ((port->polarity == TYPEC_POLARITY_CC1 &&
397 port->cc1 == TYPEC_CC_OPEN) ||
398 (port->polarity == TYPEC_POLARITY_CC2 &&
399 port->cc2 == TYPEC_CC_OPEN)));
400}
401
402/*
403 * Logging
404 */
405
406#ifdef CONFIG_DEBUG_FS
407
408static bool tcpm_log_full(struct tcpm_port *port)
409{
410 return port->logbuffer_tail ==
411 (port->logbuffer_head + 1) % LOG_BUFFER_ENTRIES;
412}
413
e79e0125 414__printf(2, 0)
f0690a25
GR		 415static void _tcpm_log(struct tcpm_port *port, const char *fmt, va_list args)
416{
417 char tmpbuffer[LOG_BUFFER_ENTRY_SIZE];
418 u64 ts_nsec = local_clock();
419 unsigned long rem_nsec;
420
421 if (!port->logbuffer[port->logbuffer_head]) {
422 port->logbuffer[port->logbuffer_head] =
423 kzalloc(LOG_BUFFER_ENTRY_SIZE, GFP_KERNEL);
424 if (!port->logbuffer[port->logbuffer_head])
425 return;
426 }
427
428 vsnprintf(tmpbuffer, sizeof(tmpbuffer), fmt, args);
429
430 mutex_lock(&port->logbuffer_lock);
431
432 if (tcpm_log_full(port)) {
433 port->logbuffer_head = max(port->logbuffer_head - 1, 0);
434 strcpy(tmpbuffer, "overflow");
435 }
436
437 if (port->logbuffer_head < 0 ||
438 port->logbuffer_head >= LOG_BUFFER_ENTRIES) {
439 dev_warn(port->dev,
440 "Bad log buffer index %d\n", port->logbuffer_head);
441 goto abort;
442 }
443
444 if (!port->logbuffer[port->logbuffer_head]) {
445 dev_warn(port->dev,
446 "Log buffer index %d is NULL\n", port->logbuffer_head);
447 goto abort;
448 }
449
450 rem_nsec = do_div(ts_nsec, 1000000000);
451 scnprintf(port->logbuffer[port->logbuffer_head],
452 LOG_BUFFER_ENTRY_SIZE, "[%5lu.%06lu] %s",
453 (unsigned long)ts_nsec, rem_nsec / 1000,
454 tmpbuffer);
455 port->logbuffer_head = (port->logbuffer_head + 1) % LOG_BUFFER_ENTRIES;
456
457abort:
458 mutex_unlock(&port->logbuffer_lock);
459}
460
e79e0125 461__printf(2, 3)
f0690a25
GR		 462static void tcpm_log(struct tcpm_port *port, const char *fmt, ...)
463{
464 va_list args;
465
466 /* Do not log while disconnected and unattached */
467 if (tcpm_port_is_disconnected(port) &&
468 (port->state == SRC_UNATTACHED || port->state == SNK_UNATTACHED ||
469 port->state == DRP_TOGGLING))
470 return;
471
472 va_start(args, fmt);
473 _tcpm_log(port, fmt, args);
474 va_end(args);
475}
476
e79e0125 477__printf(2, 3)
f0690a25
GR		 478static void tcpm_log_force(struct tcpm_port *port, const char *fmt, ...)
479{
480 va_list args;
481
482 va_start(args, fmt);
483 _tcpm_log(port, fmt, args);
484 va_end(args);
485}
486
487static void tcpm_log_source_caps(struct tcpm_port *port)
488{
489 int i;
490
491 for (i = 0; i < port->nr_source_caps; i++) {
492 u32 pdo = port->source_caps[i];
493 enum pd_pdo_type type = pdo_type(pdo);
494 char msg[64];
495
496 switch (type) {
497 case PDO_TYPE_FIXED:
498 scnprintf(msg, sizeof(msg),
499 "%u mV, %u mA [%s%s%s%s%s%s]",
500 pdo_fixed_voltage(pdo),
501 pdo_max_current(pdo),
502 (pdo & PDO_FIXED_DUAL_ROLE) ?
503 "R" : "",
504 (pdo & PDO_FIXED_SUSPEND) ?
505 "S" : "",
506 (pdo & PDO_FIXED_HIGHER_CAP) ?
507 "H" : "",
508 (pdo & PDO_FIXED_USB_COMM) ?
509 "U" : "",
510 (pdo & PDO_FIXED_DATA_SWAP) ?
511 "D" : "",
512 (pdo & PDO_FIXED_EXTPOWER) ?
513 "E" : "");
514 break;
515 case PDO_TYPE_VAR:
516 scnprintf(msg, sizeof(msg),
517 "%u-%u mV, %u mA",
518 pdo_min_voltage(pdo),
519 pdo_max_voltage(pdo),
520 pdo_max_current(pdo));
521 break;
522 case PDO_TYPE_BATT:
523 scnprintf(msg, sizeof(msg),
524 "%u-%u mV, %u mW",
525 pdo_min_voltage(pdo),
526 pdo_max_voltage(pdo),
527 pdo_max_power(pdo));
528 break;
2eadc33f
AT		 529 case PDO_TYPE_APDO:
530 if (pdo_apdo_type(pdo) == APDO_TYPE_PPS)
531 scnprintf(msg, sizeof(msg),
532 "%u-%u mV, %u mA",
533 pdo_pps_apdo_min_voltage(pdo),
534 pdo_pps_apdo_max_voltage(pdo),
535 pdo_pps_apdo_max_current(pdo));
536 else
537 strcpy(msg, "undefined APDO");
538 break;
f0690a25
GR		 539 default:
540 strcpy(msg, "undefined");
541 break;
542 }
543 tcpm_log(port, " PDO %d: type %d, %s",
544 i, type, msg);
545 }
546}
547
9e902c59 548static int tcpm_debug_show(struct seq_file *s, void *v)
f0690a25
GR		 549{
550 struct tcpm_port *port = (struct tcpm_port *)s->private;
551 int tail;
552
553 mutex_lock(&port->logbuffer_lock);
554 tail = port->logbuffer_tail;
555 while (tail != port->logbuffer_head) {
556 seq_printf(s, "%s\n", port->logbuffer[tail]);
557 tail = (tail + 1) % LOG_BUFFER_ENTRIES;
558 }
559 if (!seq_has_overflowed(s))
560 port->logbuffer_tail = tail;
561 mutex_unlock(&port->logbuffer_lock);
562
563 return 0;
564}
9e902c59 565DEFINE_SHOW_ATTRIBUTE(tcpm_debug);
f0690a25
GR		 566
567static struct dentry *rootdir;
568
a941fc39 569static void tcpm_debugfs_init(struct tcpm_port *port)
f0690a25
GR		 570{
571 mutex_init(&port->logbuffer_lock);
572 /* /sys/kernel/debug/tcpm/usbcX */
a941fc39 573 if (!rootdir)
f0690a25 574 rootdir = debugfs_create_dir("tcpm", NULL);
f0690a25
GR		 575
576 port->dentry = debugfs_create_file(dev_name(port->dev),
577 S_IFREG | 0444, rootdir,
9e902c59 578 port, &tcpm_debug_fops);
f0690a25
GR		 579}
580
581static void tcpm_debugfs_exit(struct tcpm_port *port)
582{
583 debugfs_remove(port->dentry);
584}
585
586#else
587
e79e0125 588__printf(2, 3)
f0690a25 589static void tcpm_log(const struct tcpm_port *port, const char *fmt, ...) { }
e79e0125 590__printf(2, 3)
f0690a25
GR		 591static void tcpm_log_force(struct tcpm_port *port, const char *fmt, ...) { }
592static void tcpm_log_source_caps(struct tcpm_port *port) { }
a941fc39 593static void tcpm_debugfs_init(const struct tcpm_port *port) { }
f0690a25
GR		 594static void tcpm_debugfs_exit(const struct tcpm_port *port) { }
595
596#endif
597
598static int tcpm_pd_transmit(struct tcpm_port *port,
599 enum tcpm_transmit_type type,
600 const struct pd_message *msg)
601{
602 unsigned long timeout;
603 int ret;
604
605 if (msg)
606 tcpm_log(port, "PD TX, header: %#x", le16_to_cpu(msg->header));
607 else
608 tcpm_log(port, "PD TX, type: %#x", type);
609
610 reinit_completion(&port->tx_complete);
611 ret = port->tcpc->pd_transmit(port->tcpc, type, msg);
612 if (ret < 0)
613 return ret;
614
615 mutex_unlock(&port->lock);
616 timeout = wait_for_completion_timeout(&port->tx_complete,
617 msecs_to_jiffies(PD_T_TCPC_TX_TIMEOUT));
618 mutex_lock(&port->lock);
619 if (!timeout)
620 return -ETIMEDOUT;
621
622 switch (port->tx_status) {
623 case TCPC_TX_SUCCESS:
624 port->message_id = (port->message_id + 1) & PD_HEADER_ID_MASK;
625 return 0;
626 case TCPC_TX_DISCARDED:
627 return -EAGAIN;
628 case TCPC_TX_FAILED:
629 default:
630 return -EIO;
631 }
632}
633
634void tcpm_pd_transmit_complete(struct tcpm_port *port,
635 enum tcpm_transmit_status status)
636{
637 tcpm_log(port, "PD TX complete, status: %u", status);
638 port->tx_status = status;
639 complete(&port->tx_complete);
640}
641EXPORT_SYMBOL_GPL(tcpm_pd_transmit_complete);
642
643static int tcpm_mux_set(struct tcpm_port *port, enum tcpc_mux_mode mode,
2000016c
HG		 644 enum usb_role usb_role,
645 enum typec_orientation orientation)
f0690a25 646{
2000016c 647 int ret;
f0690a25 648
2000016c
HG		 649 tcpm_log(port, "Requesting mux mode %d, usb-role %d, orientation %d",
650 mode, usb_role, orientation);
f0690a25 651
2000016c
HG		 652 ret = typec_set_orientation(port->typec_port, orientation);
653 if (ret)
654 return ret;
f0690a25 655
2000016c
HG		 656 if (port->role_sw) {
657 ret = usb_role_switch_set_role(port->role_sw, usb_role);
658 if (ret)
659 return ret;
660 }
661
662 return typec_set_mode(port->typec_port, mode);
f0690a25
GR		 663}
664
665static int tcpm_set_polarity(struct tcpm_port *port,
666 enum typec_cc_polarity polarity)
667{
668 int ret;
669
670 tcpm_log(port, "polarity %d", polarity);
671
672 ret = port->tcpc->set_polarity(port->tcpc, polarity);
673 if (ret < 0)
674 return ret;
675
676 port->polarity = polarity;
677
678 return 0;
679}
680
681static int tcpm_set_vconn(struct tcpm_port *port, bool enable)
682{
683 int ret;
684
685 tcpm_log(port, "vconn:=%d", enable);
686
687 ret = port->tcpc->set_vconn(port->tcpc, enable);
688 if (!ret) {
689 port->vconn_role = enable ? TYPEC_SOURCE : TYPEC_SINK;
690 typec_set_vconn_role(port->typec_port, port->vconn_role);
691 }
692
693 return ret;
694}
695
696static u32 tcpm_get_current_limit(struct tcpm_port *port)
697{
698 enum typec_cc_status cc;
699 u32 limit;
700
701 cc = port->polarity ? port->cc2 : port->cc1;
702 switch (cc) {
703 case TYPEC_CC_RP_1_5:
704 limit = 1500;
705 break;
706 case TYPEC_CC_RP_3_0:
707 limit = 3000;
708 break;
709 case TYPEC_CC_RP_DEF:
710 default:
ea62cfc7
HG		 711 if (port->tcpc->get_current_limit)
712 limit = port->tcpc->get_current_limit(port->tcpc);
713 else
714 limit = 0;
f0690a25
GR		 715 break;
716 }
717
718 return limit;
719}
720
721static int tcpm_set_current_limit(struct tcpm_port *port, u32 max_ma, u32 mv)
722{
723 int ret = -EOPNOTSUPP;
724
725 tcpm_log(port, "Setting voltage/current limit %u mV %u mA", mv, max_ma);
726
727 if (port->tcpc->set_current_limit)
728 ret = port->tcpc->set_current_limit(port->tcpc, max_ma, mv);
729
730 return ret;
731}
732
733/*
734 * Determine RP value to set based on maximum current supported
735 * by a port if configured as source.
736 * Returns CC value to report to link partner.
737 */
738static enum typec_cc_status tcpm_rp_cc(struct tcpm_port *port)
739{
740 const u32 *src_pdo = port->src_pdo;
741 int nr_pdo = port->nr_src_pdo;
742 int i;
743
744 /*
745 * Search for first entry with matching voltage.
746 * It should report the maximum supported current.
747 */
748 for (i = 0; i < nr_pdo; i++) {
749 const u32 pdo = src_pdo[i];
750
751 if (pdo_type(pdo) == PDO_TYPE_FIXED &&
752 pdo_fixed_voltage(pdo) == 5000) {
753 unsigned int curr = pdo_max_current(pdo);
754
755 if (curr >= 3000)
756 return TYPEC_CC_RP_3_0;
757 else if (curr >= 1500)
758 return TYPEC_CC_RP_1_5;
759 return TYPEC_CC_RP_DEF;
760 }
761 }
762
763 return TYPEC_CC_RP_DEF;
764}
765
766static int tcpm_set_attached_state(struct tcpm_port *port, bool attached)
767{
768 return port->tcpc->set_roles(port->tcpc, attached, port->pwr_role,
769 port->data_role);
770}
771
772static int tcpm_set_roles(struct tcpm_port *port, bool attached,
773 enum typec_role role, enum typec_data_role data)
774{
2000016c 775 enum typec_orientation orientation;
c6962c29 776 enum usb_role usb_role;
f0690a25
GR		 777 int ret;
778
2000016c
HG		 779 if (port->polarity == TYPEC_POLARITY_CC1)
780 orientation = TYPEC_ORIENTATION_NORMAL;
781 else
782 orientation = TYPEC_ORIENTATION_REVERSE;
783
f0690a25 784 if (data == TYPEC_HOST)
c6962c29 785 usb_role = USB_ROLE_HOST;
f0690a25 786 else
c6962c29
HG		 787 usb_role = USB_ROLE_DEVICE;
788
2000016c 789 ret = tcpm_mux_set(port, TYPEC_MUX_USB, usb_role, orientation);
f0690a25
GR		 790 if (ret < 0)
791 return ret;
792
793 ret = port->tcpc->set_roles(port->tcpc, attached, role, data);
794 if (ret < 0)
795 return ret;
796
797 port->pwr_role = role;
798 port->data_role = data;
799 typec_set_data_role(port->typec_port, data);
800 typec_set_pwr_role(port->typec_port, role);
801
802 return 0;
803}
804
805static int tcpm_set_pwr_role(struct tcpm_port *port, enum typec_role role)
806{
807 int ret;
808
809 ret = port->tcpc->set_roles(port->tcpc, true, role,
810 port->data_role);
811 if (ret < 0)
812 return ret;
813
814 port->pwr_role = role;
815 typec_set_pwr_role(port->typec_port, role);
816
817 return 0;
818}
819
820static int tcpm_pd_send_source_caps(struct tcpm_port *port)
821{
822 struct pd_message msg;
823 int i;
824
825 memset(&msg, 0, sizeof(msg));
826 if (!port->nr_src_pdo) {
827 /* No source capabilities defined, sink only */
828 msg.header = PD_HEADER_LE(PD_CTRL_REJECT,
829 port->pwr_role,
830 port->data_role,
2eadc33f 831 port->negotiated_rev,
f0690a25
GR		 832 port->message_id, 0);
833 } else {
834 msg.header = PD_HEADER_LE(PD_DATA_SOURCE_CAP,
835 port->pwr_role,
836 port->data_role,
2eadc33f 837 port->negotiated_rev,
f0690a25
GR		 838 port->message_id,
839 port->nr_src_pdo);
840 }
841 for (i = 0; i < port->nr_src_pdo; i++)
842 msg.payload[i] = cpu_to_le32(port->src_pdo[i]);
843
844 return tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
845}
846
847static int tcpm_pd_send_sink_caps(struct tcpm_port *port)
848{
849 struct pd_message msg;
850 int i;
851
852 memset(&msg, 0, sizeof(msg));
853 if (!port->nr_snk_pdo) {
854 /* No sink capabilities defined, source only */
855 msg.header = PD_HEADER_LE(PD_CTRL_REJECT,
856 port->pwr_role,
857 port->data_role,
2eadc33f 858 port->negotiated_rev,
f0690a25
GR		 859 port->message_id, 0);
860 } else {
861 msg.header = PD_HEADER_LE(PD_DATA_SINK_CAP,
862 port->pwr_role,
863 port->data_role,
2eadc33f 864 port->negotiated_rev,
f0690a25
GR		 865 port->message_id,
866 port->nr_snk_pdo);
867 }
868 for (i = 0; i < port->nr_snk_pdo; i++)
869 msg.payload[i] = cpu_to_le32(port->snk_pdo[i]);
870
871 return tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
872}
873
874static void tcpm_set_state(struct tcpm_port *port, enum tcpm_state state,
875 unsigned int delay_ms)
876{
877 if (delay_ms) {
878 tcpm_log(port, "pending state change %s -> %s @ %u ms",
879 tcpm_states[port->state], tcpm_states[state],
880 delay_ms);
881 port->delayed_state = state;
882 mod_delayed_work(port->wq, &port->state_machine,
883 msecs_to_jiffies(delay_ms));
884 port->delayed_runtime = jiffies + msecs_to_jiffies(delay_ms);
885 port->delay_ms = delay_ms;
886 } else {
887 tcpm_log(port, "state change %s -> %s",
888 tcpm_states[port->state], tcpm_states[state]);
889 port->delayed_state = INVALID_STATE;
890 port->prev_state = port->state;
891 port->state = state;
892 /*
893 * Don't re-queue the state machine work item if we're currently
894 * in the state machine and we're immediately changing states.
895 * tcpm_state_machine_work() will continue running the state
896 * machine.
897 */
898 if (!port->state_machine_running)
899 mod_delayed_work(port->wq, &port->state_machine, 0);
900 }
901}
902
903static void tcpm_set_state_cond(struct tcpm_port *port, enum tcpm_state state,
904 unsigned int delay_ms)
905{
906 if (port->enter_state == port->state)
907 tcpm_set_state(port, state, delay_ms);
908 else
909 tcpm_log(port,
910 "skipped %sstate change %s -> %s [%u ms], context state %s",
911 delay_ms ? "delayed " : "",
912 tcpm_states[port->state], tcpm_states[state],
913 delay_ms, tcpm_states[port->enter_state]);
914}
915
916static void tcpm_queue_message(struct tcpm_port *port,
917 enum pd_msg_request message)
918{
919 port->queued_message = message;
920 mod_delayed_work(port->wq, &port->state_machine, 0);
921}
922
923/*
924 * VDM/VDO handling functions
925 */
926static void tcpm_queue_vdm(struct tcpm_port *port, const u32 header,
927 const u32 *data, int cnt)
928{
929 port->vdo_count = cnt + 1;
930 port->vdo_data[0] = header;
931 memcpy(&port->vdo_data[1], data, sizeof(u32) * cnt);
932 /* Set ready, vdm state machine will actually send */
933 port->vdm_retries = 0;
934 port->vdm_state = VDM_STATE_READY;
935}
936
937static void svdm_consume_identity(struct tcpm_port *port, const __le32 *payload,
938 int cnt)
939{
940 u32 vdo = le32_to_cpu(payload[VDO_INDEX_IDH]);
941 u32 product = le32_to_cpu(payload[VDO_INDEX_PRODUCT]);
942
943 memset(&port->mode_data, 0, sizeof(port->mode_data));
944
f0690a25
GR		 945 port->partner_ident.id_header = vdo;
946 port->partner_ident.cert_stat = le32_to_cpu(payload[VDO_INDEX_CSTAT]);
947 port->partner_ident.product = product;
948
949 typec_partner_set_identity(port->partner);
950
951 tcpm_log(port, "Identity: %04x:%04x.%04x",
952 PD_IDH_VID(vdo),
953 PD_PRODUCT_PID(product), product & 0xffff);
954}
955
956static bool svdm_consume_svids(struct tcpm_port *port, const __le32 *payload,
957 int cnt)
958{
959 struct pd_mode_data *pmdata = &port->mode_data;
960 int i;
961
962 for (i = 1; i < cnt; i++) {
963 u32 p = le32_to_cpu(payload[i]);
964 u16 svid;
965
966 svid = (p >> 16) & 0xffff;
967 if (!svid)
968 return false;
969
970 if (pmdata->nsvids >= SVID_DISCOVERY_MAX)
971 goto abort;
972
973 pmdata->svids[pmdata->nsvids++] = svid;
974 tcpm_log(port, "SVID %d: 0x%x", pmdata->nsvids, svid);
975
976 svid = p & 0xffff;
977 if (!svid)
978 return false;
979
980 if (pmdata->nsvids >= SVID_DISCOVERY_MAX)
981 goto abort;
982
983 pmdata->svids[pmdata->nsvids++] = svid;
984 tcpm_log(port, "SVID %d: 0x%x", pmdata->nsvids, svid);
985 }
986 return true;
987abort:
988 tcpm_log(port, "SVID_DISCOVERY_MAX(%d) too low!", SVID_DISCOVERY_MAX);
989 return false;
990}
991
992static void svdm_consume_modes(struct tcpm_port *port, const __le32 *payload,
993 int cnt)
994{
995 struct pd_mode_data *pmdata = &port->mode_data;
996 struct typec_altmode_desc *paltmode;
997 struct typec_mode_desc *pmode;
998 int i;
999
1000 if (pmdata->altmodes >= ARRAY_SIZE(port->partner_altmode)) {
1001 /* Already logged in svdm_consume_svids() */
1002 return;
1003 }
1004
1005 paltmode = &pmdata->altmode_desc[pmdata->altmodes];
1006 memset(paltmode, 0, sizeof(*paltmode));
1007
1008 paltmode->svid = pmdata->svids[pmdata->svid_index];
1009
1010 tcpm_log(port, " Alternate mode %d: SVID 0x%04x",
1011 pmdata->altmodes, paltmode->svid);
1012
1013 for (i = 1; i < cnt && paltmode->n_modes < ALTMODE_MAX_MODES; i++) {
1014 pmode = &paltmode->modes[paltmode->n_modes];
1015 memset(pmode, 0, sizeof(*pmode));
1016 pmode->vdo = le32_to_cpu(payload[i]);
1017 pmode->index = i - 1;
1018 paltmode->n_modes++;
1019 tcpm_log(port, " VDO %d: 0x%08x",
1020 pmode->index, pmode->vdo);
1021 }
1022 port->partner_altmode[pmdata->altmodes] =
1023 typec_partner_register_altmode(port->partner, paltmode);
4c87b3e5 1024 if (!port->partner_altmode[pmdata->altmodes]) {
f0690a25
GR		 1025 tcpm_log(port,
1026 "Failed to register alternate modes for SVID 0x%04x",
1027 paltmode->svid);
1028 return;
1029 }
1030 pmdata->altmodes++;
1031}
1032
1033#define supports_modal(port) PD_IDH_MODAL_SUPP((port)->partner_ident.id_header)
1034
1035static int tcpm_pd_svdm(struct tcpm_port *port, const __le32 *payload, int cnt,
1036 u32 *response)
1037{
1038 u32 p0 = le32_to_cpu(payload[0]);
1039 int cmd_type = PD_VDO_CMDT(p0);
1040 int cmd = PD_VDO_CMD(p0);
1041 struct pd_mode_data *modep;
1042 int rlen = 0;
1043 u16 svid;
193a6801 1044 int i;
f0690a25
GR		 1045
1046 tcpm_log(port, "Rx VDM cmd 0x%x type %d cmd %d len %d",
1047 p0, cmd_type, cmd, cnt);
1048
1049 modep = &port->mode_data;
1050
1051 switch (cmd_type) {
1052 case CMDT_INIT:
1053 switch (cmd) {
1054 case CMD_DISCOVER_IDENT:
193a6801
GR		 1055 /* 6.4.4.3.1: Only respond as UFP (device) */
1056 if (port->data_role == TYPEC_DEVICE &&
1057 port->nr_snk_vdo) {
1058 for (i = 0; i < port->nr_snk_vdo; i++)
cbe5843e 1059 response[i + 1] = port->snk_vdo[i];
193a6801
GR		 1060 rlen = port->nr_snk_vdo + 1;
1061 }
f0690a25
GR		 1062 break;
1063 case CMD_DISCOVER_SVID:
1064 break;
1065 case CMD_DISCOVER_MODES:
1066 break;
1067 case CMD_ENTER_MODE:
1068 break;
1069 case CMD_EXIT_MODE:
1070 break;
1071 case CMD_ATTENTION:
1072 break;
1073 default:
1074 break;
1075 }
1076 if (rlen >= 1) {
1077 response[0] = p0 | VDO_CMDT(CMDT_RSP_ACK);
1078 } else if (rlen == 0) {
1079 response[0] = p0 | VDO_CMDT(CMDT_RSP_NAK);
1080 rlen = 1;
1081 } else {
1082 response[0] = p0 | VDO_CMDT(CMDT_RSP_BUSY);
1083 rlen = 1;
1084 }
1085 break;
1086 case CMDT_RSP_ACK:
1087 /* silently drop message if we are not connected */
cf6e06cd 1088 if (IS_ERR_OR_NULL(port->partner))
f0690a25
GR		 1089 break;
1090
1091 switch (cmd) {
1092 case CMD_DISCOVER_IDENT:
1093 /* 6.4.4.3.1 */
1094 svdm_consume_identity(port, payload, cnt);
1095 response[0] = VDO(USB_SID_PD, 1, CMD_DISCOVER_SVID);
1096 rlen = 1;
1097 break;
1098 case CMD_DISCOVER_SVID:
1099 /* 6.4.4.3.2 */
1100 if (svdm_consume_svids(port, payload, cnt)) {
1101 response[0] = VDO(USB_SID_PD, 1,
1102 CMD_DISCOVER_SVID);
1103 rlen = 1;
1104 } else if (modep->nsvids && supports_modal(port)) {
1105 response[0] = VDO(modep->svids[0], 1,
1106 CMD_DISCOVER_MODES);
1107 rlen = 1;
1108 }
1109 break;
1110 case CMD_DISCOVER_MODES:
1111 /* 6.4.4.3.3 */
1112 svdm_consume_modes(port, payload, cnt);
1113 modep->svid_index++;
1114 if (modep->svid_index < modep->nsvids) {
1115 svid = modep->svids[modep->svid_index];
1116 response[0] = VDO(svid, 1, CMD_DISCOVER_MODES);
1117 rlen = 1;
1118 } else {
44262fad 1119 /* enter alternate mode if/when implemented */
f0690a25
GR		 1120 }
1121 break;
1122 case CMD_ENTER_MODE:
1123 break;
1124 default:
1125 break;
1126 }
1127 break;
1128 default:
1129 break;
1130 }
1131
1132 return rlen;
1133}
1134
1135static void tcpm_handle_vdm_request(struct tcpm_port *port,
1136 const __le32 *payload, int cnt)
1137{
1138 int rlen = 0;
1139 u32 response[8] = { };
1140 u32 p0 = le32_to_cpu(payload[0]);
1141
1142 if (port->vdm_state == VDM_STATE_BUSY) {
1143 /* If UFP responded busy retry after timeout */
1144 if (PD_VDO_CMDT(p0) == CMDT_RSP_BUSY) {
1145 port->vdm_state = VDM_STATE_WAIT_RSP_BUSY;
1146 port->vdo_retry = (p0 & ~VDO_CMDT_MASK) |
1147 CMDT_INIT;
1148 mod_delayed_work(port->wq, &port->vdm_state_machine,
1149 msecs_to_jiffies(PD_T_VDM_BUSY));
1150 return;
1151 }
1152 port->vdm_state = VDM_STATE_DONE;
1153 }
1154
1155 if (PD_VDO_SVDM(p0))
1156 rlen = tcpm_pd_svdm(port, payload, cnt, response);
f0690a25
GR		 1157
1158 if (rlen > 0) {
1159 tcpm_queue_vdm(port, response[0], &response[1], rlen - 1);
1160 mod_delayed_work(port->wq, &port->vdm_state_machine, 0);
1161 }
1162}
1163
1164static void tcpm_send_vdm(struct tcpm_port *port, u32 vid, int cmd,
1165 const u32 *data, int count)
1166{
1167 u32 header;
1168
1169 if (WARN_ON(count > VDO_MAX_SIZE - 1))
1170 count = VDO_MAX_SIZE - 1;
1171
1172 /* set VDM header with VID & CMD */
1173 header = VDO(vid, ((vid & USB_SID_PD) == USB_SID_PD) ?
1174 1 : (PD_VDO_CMD(cmd) <= CMD_ATTENTION), cmd);
1175 tcpm_queue_vdm(port, header, data, count);
1176
1177 mod_delayed_work(port->wq, &port->vdm_state_machine, 0);
1178}
1179
1180static unsigned int vdm_ready_timeout(u32 vdm_hdr)
1181{
1182 unsigned int timeout;
1183 int cmd = PD_VDO_CMD(vdm_hdr);
1184
1185 /* its not a structured VDM command */
1186 if (!PD_VDO_SVDM(vdm_hdr))
1187 return PD_T_VDM_UNSTRUCTURED;
1188
1189 switch (PD_VDO_CMDT(vdm_hdr)) {
1190 case CMDT_INIT:
1191 if (cmd == CMD_ENTER_MODE || cmd == CMD_EXIT_MODE)
1192 timeout = PD_T_VDM_WAIT_MODE_E;
1193 else
1194 timeout = PD_T_VDM_SNDR_RSP;
1195 break;
1196 default:
1197 if (cmd == CMD_ENTER_MODE || cmd == CMD_EXIT_MODE)
1198 timeout = PD_T_VDM_E_MODE;
1199 else
1200 timeout = PD_T_VDM_RCVR_RSP;
1201 break;
1202 }
1203 return timeout;
1204}
1205
1206static void vdm_run_state_machine(struct tcpm_port *port)
1207{
1208 struct pd_message msg;
1209 int i, res;
1210
1211 switch (port->vdm_state) {
1212 case VDM_STATE_READY:
1213 /* Only transmit VDM if attached */
1214 if (!port->attached) {
1215 port->vdm_state = VDM_STATE_ERR_BUSY;
1216 break;
1217 }
1218
1219 /*
1220 * if there's traffic or we're not in PDO ready state don't send
1221 * a VDM.
1222 */
1223 if (port->state != SRC_READY && port->state != SNK_READY)
1224 break;
1225
1226 /* Prepare and send VDM */
1227 memset(&msg, 0, sizeof(msg));
1228 msg.header = PD_HEADER_LE(PD_DATA_VENDOR_DEF,
1229 port->pwr_role,
1230 port->data_role,
2eadc33f 1231 port->negotiated_rev,
f0690a25
GR		 1232 port->message_id, port->vdo_count);
1233 for (i = 0; i < port->vdo_count; i++)
1234 msg.payload[i] = cpu_to_le32(port->vdo_data[i]);
1235 res = tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
1236 if (res < 0) {
1237 port->vdm_state = VDM_STATE_ERR_SEND;
1238 } else {
1239 unsigned long timeout;
1240
1241 port->vdm_retries = 0;
1242 port->vdm_state = VDM_STATE_BUSY;
1243 timeout = vdm_ready_timeout(port->vdo_data[0]);
1244 mod_delayed_work(port->wq, &port->vdm_state_machine,
1245 timeout);
1246 }
1247 break;
1248 case VDM_STATE_WAIT_RSP_BUSY:
1249 port->vdo_data[0] = port->vdo_retry;
1250 port->vdo_count = 1;
1251 port->vdm_state = VDM_STATE_READY;
1252 break;
1253 case VDM_STATE_BUSY:
1254 port->vdm_state = VDM_STATE_ERR_TMOUT;
1255 break;
1256 case VDM_STATE_ERR_SEND:
1257 /*
1258 * A partner which does not support USB PD will not reply,
1259 * so this is not a fatal error. At the same time, some
1260 * devices may not return GoodCRC under some circumstances,
1261 * so we need to retry.
1262 */
1263 if (port->vdm_retries < 3) {
1264 tcpm_log(port, "VDM Tx error, retry");
1265 port->vdm_retries++;
1266 port->vdm_state = VDM_STATE_READY;
1267 }
1268 break;
1269 default:
1270 break;
1271 }
1272}
1273
1274static void vdm_state_machine_work(struct work_struct *work)
1275{
1276 struct tcpm_port *port = container_of(work, struct tcpm_port,
1277 vdm_state_machine.work);
1278 enum vdm_states prev_state;
1279
1280 mutex_lock(&port->lock);
1281
1282 /*
1283 * Continue running as long as the port is not busy and there was
1284 * a state change.
1285 */
1286 do {
1287 prev_state = port->vdm_state;
1288 vdm_run_state_machine(port);
1289 } while (port->vdm_state != prev_state &&
1290 port->vdm_state != VDM_STATE_BUSY);
1291
1292 mutex_unlock(&port->lock);
1293}
1294
5007e1b5
BJS		 1295enum pdo_err {
1296 PDO_NO_ERR,
1297 PDO_ERR_NO_VSAFE5V,
1298 PDO_ERR_VSAFE5V_NOT_FIRST,
1299 PDO_ERR_PDO_TYPE_NOT_IN_ORDER,
1300 PDO_ERR_FIXED_NOT_SORTED,
1301 PDO_ERR_VARIABLE_BATT_NOT_SORTED,
1302 PDO_ERR_DUPE_PDO,
2eadc33f
AT		 1303 PDO_ERR_PPS_APDO_NOT_SORTED,
1304 PDO_ERR_DUPE_PPS_APDO,
5007e1b5
BJS		 1305};
1306
1307static const char * const pdo_err_msg[] = {
1308 [PDO_ERR_NO_VSAFE5V] =
1309 " err: source/sink caps should atleast have vSafe5V",
1310 [PDO_ERR_VSAFE5V_NOT_FIRST] =
1311 " err: vSafe5V Fixed Supply Object Shall always be the first object",
1312 [PDO_ERR_PDO_TYPE_NOT_IN_ORDER] =
1313 " err: PDOs should be in the following order: Fixed; Battery; Variable",
1314 [PDO_ERR_FIXED_NOT_SORTED] =
1315 " err: Fixed supply pdos should be in increasing order of their fixed voltage",
1316 [PDO_ERR_VARIABLE_BATT_NOT_SORTED] =
1317 " err: Variable/Battery supply pdos should be in increasing order of their minimum voltage",
1318 [PDO_ERR_DUPE_PDO] =
1319 " err: Variable/Batt supply pdos cannot have same min/max voltage",
2eadc33f
AT		 1320 [PDO_ERR_PPS_APDO_NOT_SORTED] =
1321 " err: Programmable power supply apdos should be in increasing order of their maximum voltage",
1322 [PDO_ERR_DUPE_PPS_APDO] =
1323 " err: Programmable power supply apdos cannot have same min/max voltage and max current",
5007e1b5
BJS		 1324};
1325
1326static enum pdo_err tcpm_caps_err(struct tcpm_port *port, const u32 *pdo,
1327 unsigned int nr_pdo)
1328{
1329 unsigned int i;
1330
1331 /* Should at least contain vSafe5v */
1332 if (nr_pdo < 1)
1333 return PDO_ERR_NO_VSAFE5V;
1334
1335 /* The vSafe5V Fixed Supply Object Shall always be the first object */
1336 if (pdo_type(pdo[0]) != PDO_TYPE_FIXED ||
1337 pdo_fixed_voltage(pdo[0]) != VSAFE5V)
1338 return PDO_ERR_VSAFE5V_NOT_FIRST;
1339
1340 for (i = 1; i < nr_pdo; i++) {
1341 if (pdo_type(pdo[i]) < pdo_type(pdo[i - 1])) {
1342 return PDO_ERR_PDO_TYPE_NOT_IN_ORDER;
1343 } else if (pdo_type(pdo[i]) == pdo_type(pdo[i - 1])) {
1344 enum pd_pdo_type type = pdo_type(pdo[i]);
1345
1346 switch (type) {
1347 /*
1348 * The remaining Fixed Supply Objects, if
1349 * present, shall be sent in voltage order;
1350 * lowest to highest.
1351 */
1352 case PDO_TYPE_FIXED:
1353 if (pdo_fixed_voltage(pdo[i]) <=
1354 pdo_fixed_voltage(pdo[i - 1]))
1355 return PDO_ERR_FIXED_NOT_SORTED;
1356 break;
1357 /*
1358 * The Battery Supply Objects and Variable
1359 * supply, if present shall be sent in Minimum
1360 * Voltage order; lowest to highest.
1361 */
1362 case PDO_TYPE_VAR:
1363 case PDO_TYPE_BATT:
1364 if (pdo_min_voltage(pdo[i]) <
1365 pdo_min_voltage(pdo[i - 1]))
1366 return PDO_ERR_VARIABLE_BATT_NOT_SORTED;
1367 else if ((pdo_min_voltage(pdo[i]) ==
1368 pdo_min_voltage(pdo[i - 1])) &&
1369 (pdo_max_voltage(pdo[i]) ==
1370 pdo_min_voltage(pdo[i - 1])))
1371 return PDO_ERR_DUPE_PDO;
1372 break;
2eadc33f
AT		 1373 /*
1374 * The Programmable Power Supply APDOs, if present,
1375 * shall be sent in Maximum Voltage order;
1376 * lowest to highest.
1377 */
1378 case PDO_TYPE_APDO:
1379 if (pdo_apdo_type(pdo[i]) != APDO_TYPE_PPS)
1380 break;
1381
1382 if (pdo_pps_apdo_max_current(pdo[i]) <
1383 pdo_pps_apdo_max_current(pdo[i - 1]))
1384 return PDO_ERR_PPS_APDO_NOT_SORTED;
1385 else if (pdo_pps_apdo_min_voltage(pdo[i]) ==
1386 pdo_pps_apdo_min_voltage(pdo[i - 1]) &&
1387 pdo_pps_apdo_max_voltage(pdo[i]) ==
1388 pdo_pps_apdo_max_voltage(pdo[i - 1]) &&
1389 pdo_pps_apdo_max_current(pdo[i]) ==
1390 pdo_pps_apdo_max_current(pdo[i - 1]))
1391 return PDO_ERR_DUPE_PPS_APDO;
1392 break;
5007e1b5
BJS		 1393 default:
1394 tcpm_log_force(port, " Unknown pdo type");
1395 }
1396 }
1397 }
1398
1399 return PDO_NO_ERR;
1400}
1401
1402static int tcpm_validate_caps(struct tcpm_port *port, const u32 *pdo,
1403 unsigned int nr_pdo)
1404{
1405 enum pdo_err err_index = tcpm_caps_err(port, pdo, nr_pdo);
1406
1407 if (err_index != PDO_NO_ERR) {
1408 tcpm_log_force(port, " %s", pdo_err_msg[err_index]);
1409 return -EINVAL;
1410 }
1411
1412 return 0;
1413}
1414
f0690a25
GR		 1415/*
1416 * PD (data, control) command handling functions
1417 */
64f7c494
AT		 1418static inline enum tcpm_state ready_state(struct tcpm_port *port)
1419{
1420 if (port->pwr_role == TYPEC_SOURCE)
1421 return SRC_READY;
1422 else
1423 return SNK_READY;
1424}
2eadc33f
AT		 1425
1426static int tcpm_pd_send_control(struct tcpm_port *port,
1427 enum pd_ctrl_msg_type type);
1428
64f7c494
AT		 1429static void tcpm_handle_alert(struct tcpm_port *port, const __le32 *payload,
1430 int cnt)
1431{
1432 u32 p0 = le32_to_cpu(payload[0]);
1433 unsigned int type = usb_pd_ado_type(p0);
1434
1435 if (!type) {
1436 tcpm_log(port, "Alert message received with no type");
1437 return;
1438 }
1439
1440 /* Just handling non-battery alerts for now */
1441 if (!(type & USB_PD_ADO_TYPE_BATT_STATUS_CHANGE)) {
1442 switch (port->state) {
1443 case SRC_READY:
1444 case SNK_READY:
1445 tcpm_set_state(port, GET_STATUS_SEND, 0);
1446 break;
1447 default:
1448 tcpm_queue_message(port, PD_MSG_CTRL_WAIT);
1449 break;
1450 }
1451 }
1452}
1453
f0690a25
GR		 1454static void tcpm_pd_data_request(struct tcpm_port *port,
1455 const struct pd_message *msg)
1456{
1457 enum pd_data_msg_type type = pd_header_type_le(msg->header);
1458 unsigned int cnt = pd_header_cnt_le(msg->header);
2eadc33f 1459 unsigned int rev = pd_header_rev_le(msg->header);
f0690a25
GR		 1460 unsigned int i;
1461
1462 switch (type) {
1463 case PD_DATA_SOURCE_CAP:
1464 if (port->pwr_role != TYPEC_SINK)
1465 break;
1466
1467 for (i = 0; i < cnt; i++)
1468 port->source_caps[i] = le32_to_cpu(msg->payload[i]);
1469
1470 port->nr_source_caps = cnt;
1471
1472 tcpm_log_source_caps(port);
1473
5007e1b5
BJS		 1474 tcpm_validate_caps(port, port->source_caps,
1475 port->nr_source_caps);
1476
2eadc33f
AT		 1477 /*
1478 * Adjust revision in subsequent message headers, as required,
1479 * to comply with 6.2.1.1.5 of the USB PD 3.0 spec. We don't
1480 * support Rev 1.0 so just do nothing in that scenario.
1481 */
1482 if (rev == PD_REV10)
1483 break;
1484
1485 if (rev < PD_MAX_REV)
1486 port->negotiated_rev = rev;
1487
f0690a25
GR		 1488 /*
1489 * This message may be received even if VBUS is not
1490 * present. This is quite unexpected; see USB PD
1491 * specification, sections 8.3.3.6.3.1 and 8.3.3.6.3.2.
1492 * However, at the same time, we must be ready to
1493 * receive this message and respond to it 15ms after
1494 * receiving PS_RDY during power swap operations, no matter
1495 * if VBUS is available or not (USB PD specification,
1496 * section 6.5.9.2).
1497 * So we need to accept the message either way,
1498 * but be prepared to keep waiting for VBUS after it was
1499 * handled.
1500 */
1501 tcpm_set_state(port, SNK_NEGOTIATE_CAPABILITIES, 0);
1502 break;
1503 case PD_DATA_REQUEST:
1504 if (port->pwr_role != TYPEC_SOURCE ||
1505 cnt != 1) {
1506 tcpm_queue_message(port, PD_MSG_CTRL_REJECT);
1507 break;
1508 }
2eadc33f
AT		 1509
1510 /*
1511 * Adjust revision in subsequent message headers, as required,
1512 * to comply with 6.2.1.1.5 of the USB PD 3.0 spec. We don't
1513 * support Rev 1.0 so just reject in that scenario.
1514 */
1515 if (rev == PD_REV10) {
1516 tcpm_queue_message(port, PD_MSG_CTRL_REJECT);
1517 break;
1518 }
1519
1520 if (rev < PD_MAX_REV)
1521 port->negotiated_rev = rev;
1522
f0690a25
GR		 1523 port->sink_request = le32_to_cpu(msg->payload[0]);
1524 tcpm_set_state(port, SRC_NEGOTIATE_CAPABILITIES, 0);
1525 break;
1526 case PD_DATA_SINK_CAP:
1527 /* We don't do anything with this at the moment... */
1528 for (i = 0; i < cnt; i++)
1529 port->sink_caps[i] = le32_to_cpu(msg->payload[i]);
1530 port->nr_sink_caps = cnt;
1531 break;
1532 case PD_DATA_VENDOR_DEF:
1533 tcpm_handle_vdm_request(port, msg->payload, cnt);
1534 break;
1535 case PD_DATA_BIST:
1536 if (port->state == SRC_READY || port->state == SNK_READY) {
1537 port->bist_request = le32_to_cpu(msg->payload[0]);
1538 tcpm_set_state(port, BIST_RX, 0);
1539 }
1540 break;
64f7c494
AT		 1541 case PD_DATA_ALERT:
1542 tcpm_handle_alert(port, msg->payload, cnt);
1543 break;
1544 case PD_DATA_BATT_STATUS:
1545 case PD_DATA_GET_COUNTRY_INFO:
1546 /* Currently unsupported */
1547 tcpm_queue_message(port, PD_MSG_CTRL_NOT_SUPP);
1548 break;
f0690a25
GR		 1549 default:
1550 tcpm_log(port, "Unhandled data message type %#x", type);
1551 break;
1552 }
1553}
1554
2eadc33f
AT		 1555static void tcpm_pps_complete(struct tcpm_port *port, int result)
1556{
1557 if (port->pps_pending) {
1558 port->pps_status = result;
1559 port->pps_pending = false;
1560 complete(&port->pps_complete);
1561 }
1562}
1563
f0690a25
GR		 1564static void tcpm_pd_ctrl_request(struct tcpm_port *port,
1565 const struct pd_message *msg)
1566{
1567 enum pd_ctrl_msg_type type = pd_header_type_le(msg->header);
1568 enum tcpm_state next_state;
1569
1570 switch (type) {
1571 case PD_CTRL_GOOD_CRC:
1572 case PD_CTRL_PING:
1573 break;
1574 case PD_CTRL_GET_SOURCE_CAP:
1575 switch (port->state) {
1576 case SRC_READY:
1577 case SNK_READY:
1578 tcpm_queue_message(port, PD_MSG_DATA_SOURCE_CAP);
1579 break;
1580 default:
1581 tcpm_queue_message(port, PD_MSG_CTRL_REJECT);
1582 break;
1583 }
1584 break;
1585 case PD_CTRL_GET_SINK_CAP:
1586 switch (port->state) {
1587 case SRC_READY:
1588 case SNK_READY:
1589 tcpm_queue_message(port, PD_MSG_DATA_SINK_CAP);
1590 break;
1591 default:
1592 tcpm_queue_message(port, PD_MSG_CTRL_REJECT);
1593 break;
1594 }
1595 break;
1596 case PD_CTRL_GOTO_MIN:
1597 break;
1598 case PD_CTRL_PS_RDY:
1599 switch (port->state) {
1600 case SNK_TRANSITION_SINK:
1601 if (port->vbus_present) {
1602 tcpm_set_current_limit(port,
1603 port->current_limit,
1604 port->supply_voltage);
8bf05746 1605 port->explicit_contract = true;
f0690a25
GR		 1606 tcpm_set_state(port, SNK_READY, 0);
1607 } else {
1608 /*
1609 * Seen after power swap. Keep waiting for VBUS
1610 * in a transitional state.
1611 */
1612 tcpm_set_state(port,
1613 SNK_TRANSITION_SINK_VBUS, 0);
1614 }
1615 break;
b965b631 1616 case PR_SWAP_SRC_SNK_SOURCE_OFF_CC_DEBOUNCED:
f0690a25
GR		 1617 tcpm_set_state(port, PR_SWAP_SRC_SNK_SINK_ON, 0);
1618 break;
1619 case PR_SWAP_SNK_SRC_SINK_OFF:
1620 tcpm_set_state(port, PR_SWAP_SNK_SRC_SOURCE_ON, 0);
1621 break;
1622 case VCONN_SWAP_WAIT_FOR_VCONN:
1623 tcpm_set_state(port, VCONN_SWAP_TURN_OFF_VCONN, 0);
1624 break;
1625 default:
1626 break;
1627 }
1628 break;
1629 case PD_CTRL_REJECT:
1630 case PD_CTRL_WAIT:
64f7c494 1631 case PD_CTRL_NOT_SUPP:
f0690a25
GR		 1632 switch (port->state) {
1633 case SNK_NEGOTIATE_CAPABILITIES:
1634 /* USB PD specification, Figure 8-43 */
1635 if (port->explicit_contract)
1636 next_state = SNK_READY;
1637 else
1638 next_state = SNK_WAIT_CAPABILITIES;
1639 tcpm_set_state(port, next_state, 0);
1640 break;
2eadc33f
AT		 1641 case SNK_NEGOTIATE_PPS_CAPABILITIES:
1642 /* Revert data back from any requested PPS updates */
1643 port->pps_data.out_volt = port->supply_voltage;
1644 port->pps_data.op_curr = port->current_limit;
1645 port->pps_status = (type == PD_CTRL_WAIT ?
1646 -EAGAIN : -EOPNOTSUPP);
1647 tcpm_set_state(port, SNK_READY, 0);
1648 break;
f0690a25
GR		 1649 case DR_SWAP_SEND:
1650 port->swap_status = (type == PD_CTRL_WAIT ?
1651 -EAGAIN : -EOPNOTSUPP);
1652 tcpm_set_state(port, DR_SWAP_CANCEL, 0);
1653 break;
1654 case PR_SWAP_SEND:
1655 port->swap_status = (type == PD_CTRL_WAIT ?
1656 -EAGAIN : -EOPNOTSUPP);
1657 tcpm_set_state(port, PR_SWAP_CANCEL, 0);
1658 break;
1659 case VCONN_SWAP_SEND:
1660 port->swap_status = (type == PD_CTRL_WAIT ?
1661 -EAGAIN : -EOPNOTSUPP);
1662 tcpm_set_state(port, VCONN_SWAP_CANCEL, 0);
1663 break;
1664 default:
1665 break;
1666 }
1667 break;
1668 case PD_CTRL_ACCEPT:
1669 switch (port->state) {
1670 case SNK_NEGOTIATE_CAPABILITIES:
2eadc33f
AT		 1671 port->pps_data.active = false;
1672 tcpm_set_state(port, SNK_TRANSITION_SINK, 0);
1673 break;
1674 case SNK_NEGOTIATE_PPS_CAPABILITIES:
1675 port->pps_data.active = true;
1676 port->supply_voltage = port->pps_data.out_volt;
1677 port->current_limit = port->pps_data.op_curr;
f0690a25
GR		 1678 tcpm_set_state(port, SNK_TRANSITION_SINK, 0);
1679 break;
1680 case SOFT_RESET_SEND:
1681 port->message_id = 0;
5fec4b54 1682 port->rx_msgid = -1;
f0690a25
GR		 1683 if (port->pwr_role == TYPEC_SOURCE)
1684 next_state = SRC_SEND_CAPABILITIES;
1685 else
1686 next_state = SNK_WAIT_CAPABILITIES;
1687 tcpm_set_state(port, next_state, 0);
1688 break;
1689 case DR_SWAP_SEND:
1690 tcpm_set_state(port, DR_SWAP_CHANGE_DR, 0);
1691 break;
1692 case PR_SWAP_SEND:
1693 tcpm_set_state(port, PR_SWAP_START, 0);
1694 break;
1695 case VCONN_SWAP_SEND:
1696 tcpm_set_state(port, VCONN_SWAP_START, 0);
1697 break;
1698 default:
1699 break;
1700 }
1701 break;
1702 case PD_CTRL_SOFT_RESET:
1703 tcpm_set_state(port, SOFT_RESET, 0);
1704 break;
1705 case PD_CTRL_DR_SWAP:
9b0ae699 1706 if (port->port_type != TYPEC_PORT_DRP) {
f0690a25
GR		 1707 tcpm_queue_message(port, PD_MSG_CTRL_REJECT);
1708 break;
1709 }
1710 /*
1711 * XXX
1712 * 6.3.9: If an alternate mode is active, a request to swap
1713 * alternate modes shall trigger a port reset.
1714 */
1715 switch (port->state) {
1716 case SRC_READY:
1717 case SNK_READY:
1718 tcpm_set_state(port, DR_SWAP_ACCEPT, 0);
1719 break;
1720 default:
1721 tcpm_queue_message(port, PD_MSG_CTRL_WAIT);
1722 break;
1723 }
1724 break;
1725 case PD_CTRL_PR_SWAP:
9b0ae699 1726 if (port->port_type != TYPEC_PORT_DRP) {
f0690a25
GR		 1727 tcpm_queue_message(port, PD_MSG_CTRL_REJECT);
1728 break;
1729 }
1730 switch (port->state) {
1731 case SRC_READY:
1732 case SNK_READY:
1733 tcpm_set_state(port, PR_SWAP_ACCEPT, 0);
1734 break;
1735 default:
1736 tcpm_queue_message(port, PD_MSG_CTRL_WAIT);
1737 break;
1738 }
1739 break;
1740 case PD_CTRL_VCONN_SWAP:
1741 switch (port->state) {
1742 case SRC_READY:
1743 case SNK_READY:
1744 tcpm_set_state(port, VCONN_SWAP_ACCEPT, 0);
1745 break;
1746 default:
1747 tcpm_queue_message(port, PD_MSG_CTRL_WAIT);
1748 break;
1749 }
1750 break;
64f7c494
AT		 1751 case PD_CTRL_GET_SOURCE_CAP_EXT:
1752 case PD_CTRL_GET_STATUS:
1753 case PD_CTRL_FR_SWAP:
1754 case PD_CTRL_GET_PPS_STATUS:
1755 case PD_CTRL_GET_COUNTRY_CODES:
1756 /* Currently not supported */
1757 tcpm_queue_message(port, PD_MSG_CTRL_NOT_SUPP);
1758 break;
f0690a25
GR		 1759 default:
1760 tcpm_log(port, "Unhandled ctrl message type %#x", type);
1761 break;
1762 }
1763}
1764
64f7c494
AT		 1765static void tcpm_pd_ext_msg_request(struct tcpm_port *port,
1766 const struct pd_message *msg)
1767{
1768 enum pd_ext_msg_type type = pd_header_type_le(msg->header);
1769 unsigned int data_size = pd_ext_header_data_size_le(msg->ext_msg.header);
1770
25242703 1771 if (!(msg->ext_msg.header & PD_EXT_HDR_CHUNKED)) {
64f7c494
AT		 1772 tcpm_log(port, "Unchunked extended messages unsupported");
1773 return;
1774 }
1775
1776 if (data_size > PD_EXT_MAX_CHUNK_DATA) {
1777 tcpm_log(port, "Chunk handling not yet supported");
1778 return;
1779 }
1780
1781 switch (type) {
1782 case PD_EXT_STATUS:
1783 /*
1784 * If PPS related events raised then get PPS status to clear
1785 * (see USB PD 3.0 Spec, 6.5.2.4)
1786 */
1787 if (msg->ext_msg.data[USB_PD_EXT_SDB_EVENT_FLAGS] &
1788 USB_PD_EXT_SDB_PPS_EVENTS)
1789 tcpm_set_state(port, GET_PPS_STATUS_SEND, 0);
1790 else
1791 tcpm_set_state(port, ready_state(port), 0);
1792 break;
1793 case PD_EXT_PPS_STATUS:
1794 /*
1795 * For now the PPS status message is used to clear events
1796 * and nothing more.
1797 */
1798 tcpm_set_state(port, ready_state(port), 0);
1799 break;
1800 case PD_EXT_SOURCE_CAP_EXT:
1801 case PD_EXT_GET_BATT_CAP:
1802 case PD_EXT_GET_BATT_STATUS:
1803 case PD_EXT_BATT_CAP:
1804 case PD_EXT_GET_MANUFACTURER_INFO:
1805 case PD_EXT_MANUFACTURER_INFO:
1806 case PD_EXT_SECURITY_REQUEST:
1807 case PD_EXT_SECURITY_RESPONSE:
1808 case PD_EXT_FW_UPDATE_REQUEST:
1809 case PD_EXT_FW_UPDATE_RESPONSE:
1810 case PD_EXT_COUNTRY_INFO:
1811 case PD_EXT_COUNTRY_CODES:
1812 tcpm_queue_message(port, PD_MSG_CTRL_NOT_SUPP);
1813 break;
1814 default:
1815 tcpm_log(port, "Unhandled extended message type %#x", type);
1816 break;
1817 }
1818}
1819
f0690a25
GR		 1820static void tcpm_pd_rx_handler(struct work_struct *work)
1821{
1822 struct pd_rx_event *event = container_of(work,
1823 struct pd_rx_event, work);
1824 const struct pd_message *msg = &event->msg;
1825 unsigned int cnt = pd_header_cnt_le(msg->header);
1826 struct tcpm_port *port = event->port;
1827
1828 mutex_lock(&port->lock);
1829
1830 tcpm_log(port, "PD RX, header: %#x [%d]", le16_to_cpu(msg->header),
1831 port->attached);
1832
1833 if (port->attached) {
5fec4b54
GR		 1834 enum pd_ctrl_msg_type type = pd_header_type_le(msg->header);
1835 unsigned int msgid = pd_header_msgid_le(msg->header);
1836
1837 /*
1838 * USB PD standard, 6.6.1.2:
1839 * "... if MessageID value in a received Message is the
1840 * same as the stored value, the receiver shall return a
1841 * GoodCRC Message with that MessageID value and drop
1842 * the Message (this is a retry of an already received
1843 * Message). Note: this shall not apply to the Soft_Reset
1844 * Message which always has a MessageID value of zero."
1845 */
1846 if (msgid == port->rx_msgid && type != PD_CTRL_SOFT_RESET)
1847 goto done;
1848 port->rx_msgid = msgid;
1849
f0690a25
GR		 1850 /*
1851 * If both ends believe to be DFP/host, we have a data role
1852 * mismatch.
1853 */
1854 if (!!(le16_to_cpu(msg->header) & PD_HEADER_DATA_ROLE) ==
1855 (port->data_role == TYPEC_HOST)) {
1856 tcpm_log(port,
1857 "Data role mismatch, initiating error recovery");
1858 tcpm_set_state(port, ERROR_RECOVERY, 0);
1859 } else {
64f7c494
AT		 1860 if (msg->header & PD_HEADER_EXT_HDR)
1861 tcpm_pd_ext_msg_request(port, msg);
1862 else if (cnt)
f0690a25
GR		 1863 tcpm_pd_data_request(port, msg);
1864 else
1865 tcpm_pd_ctrl_request(port, msg);
1866 }
1867 }
1868
5fec4b54 1869done:
f0690a25
GR		 1870 mutex_unlock(&port->lock);
1871 kfree(event);
1872}
1873
1874void tcpm_pd_receive(struct tcpm_port *port, const struct pd_message *msg)
1875{
1876 struct pd_rx_event *event;
1877
1878 event = kzalloc(sizeof(*event), GFP_ATOMIC);
1879 if (!event)
1880 return;
1881
1882 INIT_WORK(&event->work, tcpm_pd_rx_handler);
1883 event->port = port;
1884 memcpy(&event->msg, msg, sizeof(*msg));
1885 queue_work(port->wq, &event->work);
1886}
1887EXPORT_SYMBOL_GPL(tcpm_pd_receive);
1888
1889static int tcpm_pd_send_control(struct tcpm_port *port,
1890 enum pd_ctrl_msg_type type)
1891{
1892 struct pd_message msg;
1893
1894 memset(&msg, 0, sizeof(msg));
1895 msg.header = PD_HEADER_LE(type, port->pwr_role,
1896 port->data_role,
2eadc33f 1897 port->negotiated_rev,
f0690a25
GR		 1898 port->message_id, 0);
1899
1900 return tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
1901}
1902
1903/*
1904 * Send queued message without affecting state.
1905 * Return true if state machine should go back to sleep,
1906 * false otherwise.
1907 */
1908static bool tcpm_send_queued_message(struct tcpm_port *port)
1909{
1910 enum pd_msg_request queued_message;
1911
1912 do {
1913 queued_message = port->queued_message;
1914 port->queued_message = PD_MSG_NONE;
1915
1916 switch (queued_message) {
1917 case PD_MSG_CTRL_WAIT:
1918 tcpm_pd_send_control(port, PD_CTRL_WAIT);
1919 break;
1920 case PD_MSG_CTRL_REJECT:
1921 tcpm_pd_send_control(port, PD_CTRL_REJECT);
1922 break;
64f7c494
AT		 1923 case PD_MSG_CTRL_NOT_SUPP:
1924 tcpm_pd_send_control(port, PD_CTRL_NOT_SUPP);
1925 break;
f0690a25
GR		 1926 case PD_MSG_DATA_SINK_CAP:
1927 tcpm_pd_send_sink_caps(port);
1928 break;
1929 case PD_MSG_DATA_SOURCE_CAP:
1930 tcpm_pd_send_source_caps(port);
1931 break;
1932 default:
1933 break;
1934 }
1935 } while (port->queued_message != PD_MSG_NONE);
1936
1937 if (port->delayed_state != INVALID_STATE) {
1938 if (time_is_after_jiffies(port->delayed_runtime)) {
1939 mod_delayed_work(port->wq, &port->state_machine,
1940 port->delayed_runtime - jiffies);
1941 return true;
1942 }
1943 port->delayed_state = INVALID_STATE;
1944 }
1945 return false;
1946}
1947
1948static int tcpm_pd_check_request(struct tcpm_port *port)
1949{
1950 u32 pdo, rdo = port->sink_request;
1951 unsigned int max, op, pdo_max, index;
1952 enum pd_pdo_type type;
1953
1954 index = rdo_index(rdo);
1955 if (!index || index > port->nr_src_pdo)
1956 return -EINVAL;
1957
1958 pdo = port->src_pdo[index - 1];
1959 type = pdo_type(pdo);
1960 switch (type) {
1961 case PDO_TYPE_FIXED:
1962 case PDO_TYPE_VAR:
1963 max = rdo_max_current(rdo);
1964 op = rdo_op_current(rdo);
1965 pdo_max = pdo_max_current(pdo);
1966
1967 if (op > pdo_max)
1968 return -EINVAL;
1969 if (max > pdo_max && !(rdo & RDO_CAP_MISMATCH))
1970 return -EINVAL;
1971
1972 if (type == PDO_TYPE_FIXED)
1973 tcpm_log(port,
1974 "Requested %u mV, %u mA for %u / %u mA",
1975 pdo_fixed_voltage(pdo), pdo_max, op, max);
1976 else
1977 tcpm_log(port,
1978 "Requested %u -> %u mV, %u mA for %u / %u mA",
1979 pdo_min_voltage(pdo), pdo_max_voltage(pdo),
1980 pdo_max, op, max);
1981 break;
1982 case PDO_TYPE_BATT:
1983 max = rdo_max_power(rdo);
1984 op = rdo_op_power(rdo);
1985 pdo_max = pdo_max_power(pdo);
1986
1987 if (op > pdo_max)
1988 return -EINVAL;
1989 if (max > pdo_max && !(rdo & RDO_CAP_MISMATCH))
1990 return -EINVAL;
1991 tcpm_log(port,
1992 "Requested %u -> %u mV, %u mW for %u / %u mW",
1993 pdo_min_voltage(pdo), pdo_max_voltage(pdo),
1994 pdo_max, op, max);
1995 break;
1996 default:
1997 return -EINVAL;
1998 }
1999
2000 port->op_vsafe5v = index == 1;
2001
2002 return 0;
2003}
2004
53fe0de9
LJ		 2005#define min_power(x, y) min(pdo_max_power(x), pdo_max_power(y))
2006#define min_current(x, y) min(pdo_max_current(x), pdo_max_current(y))
2007
2008static int tcpm_pd_select_pdo(struct tcpm_port *port, int *sink_pdo,
2009 int *src_pdo)
f0690a25 2010{
53fe0de9
LJ		 2011 unsigned int i, j, max_src_mv = 0, min_src_mv = 0, max_mw = 0,
2012 max_mv = 0, src_mw = 0, src_ma = 0, max_snk_mv = 0,
2013 min_snk_mv = 0;
f0690a25
GR		 2014 int ret = -EINVAL;
2015
2eadc33f 2016 port->pps_data.supported = false;
f2a8aa05 2017 port->usb_type = POWER_SUPPLY_USB_TYPE_PD;
2eadc33f 2018
f0690a25 2019 /*
53fe0de9
LJ		 2020 * Select the source PDO providing the most power which has a
2021 * matchig sink cap.
f0690a25
GR		 2022 */
2023 for (i = 0; i < port->nr_source_caps; i++) {
2024 u32 pdo = port->source_caps[i];
2025 enum pd_pdo_type type = pdo_type(pdo);
f0690a25 2026
2eadc33f
AT		 2027 switch (type) {
2028 case PDO_TYPE_FIXED:
53fe0de9
LJ		 2029 max_src_mv = pdo_fixed_voltage(pdo);
2030 min_src_mv = max_src_mv;
2eadc33f
AT		 2031 break;
2032 case PDO_TYPE_BATT:
2033 case PDO_TYPE_VAR:
53fe0de9
LJ		 2034 max_src_mv = pdo_max_voltage(pdo);
2035 min_src_mv = pdo_min_voltage(pdo);
2eadc33f
AT		 2036 break;
2037 case PDO_TYPE_APDO:
f2a8aa05 2038 if (pdo_apdo_type(pdo) == APDO_TYPE_PPS) {
2eadc33f 2039 port->pps_data.supported = true;
f2a8aa05
AT		 2040 port->usb_type =
2041 POWER_SUPPLY_USB_TYPE_PD_PPS;
2042 }
2eadc33f
AT		 2043 continue;
2044 default:
2045 tcpm_log(port, "Invalid source PDO type, ignoring");
2046 continue;
53fe0de9 2047 }
6f566af3 2048
2eadc33f
AT		 2049 switch (type) {
2050 case PDO_TYPE_FIXED:
2051 case PDO_TYPE_VAR:
53fe0de9
LJ		 2052 src_ma = pdo_max_current(pdo);
2053 src_mw = src_ma * min_src_mv / 1000;
2eadc33f
AT		 2054 break;
2055 case PDO_TYPE_BATT:
2056 src_mw = pdo_max_power(pdo);
2057 break;
2058 case PDO_TYPE_APDO:
2059 continue;
2060 default:
2061 tcpm_log(port, "Invalid source PDO type, ignoring");
2062 continue;
6f566af3
HG		 2063 }
2064
53fe0de9
LJ		 2065 for (j = 0; j < port->nr_snk_pdo; j++) {
2066 pdo = port->snk_pdo[j];
2067
2eadc33f
AT		 2068 switch (pdo_type(pdo)) {
2069 case PDO_TYPE_FIXED:
53fe0de9 2070 max_snk_mv = pdo_fixed_voltage(pdo);
2eadc33f
AT		 2071 min_snk_mv = max_snk_mv;
2072 break;
2073 case PDO_TYPE_BATT:
2074 case PDO_TYPE_VAR:
53fe0de9 2075 max_snk_mv = pdo_max_voltage(pdo);
2eadc33f
AT		 2076 min_snk_mv = pdo_min_voltage(pdo);
2077 break;
2078 case PDO_TYPE_APDO:
2079 continue;
2080 default:
2081 tcpm_log(port, "Invalid sink PDO type, ignoring");
2082 continue;
53fe0de9
LJ		 2083 }
2084
2085 if (max_src_mv <= max_snk_mv &&
2086 min_src_mv >= min_snk_mv) {
2087 /* Prefer higher voltages if available */
2088 if ((src_mw == max_mw && min_src_mv > max_mv) ||
2089 src_mw > max_mw) {
2090 *src_pdo = i;
2091 *sink_pdo = j;
2092 max_mw = src_mw;
2093 max_mv = min_src_mv;
2094 ret = 0;
2095 }
2096 }
f0690a25
GR		 2097 }
2098 }
2099
2100 return ret;
2101}
2102
2eadc33f
AT		 2103#define min_pps_apdo_current(x, y) \
2104 min(pdo_pps_apdo_max_current(x), pdo_pps_apdo_max_current(y))
2105
2106static unsigned int tcpm_pd_select_pps_apdo(struct tcpm_port *port)
2107{
2108 unsigned int i, j, max_mw = 0, max_mv = 0;
2109 unsigned int min_src_mv, max_src_mv, src_ma, src_mw;
2110 unsigned int min_snk_mv, max_snk_mv, snk_ma;
2111 u32 pdo;
2112 unsigned int src_pdo = 0, snk_pdo = 0;
2113
2114 /*
2115 * Select the source PPS APDO providing the most power while staying
2116 * within the board's limits. We skip the first PDO as this is always
2117 * 5V 3A.
2118 */
2119 for (i = 1; i < port->nr_source_caps; ++i) {
2120 pdo = port->source_caps[i];
2121
2122 switch (pdo_type(pdo)) {
2123 case PDO_TYPE_APDO:
2124 if (pdo_apdo_type(pdo) != APDO_TYPE_PPS) {
2125 tcpm_log(port, "Not PPS APDO (source), ignoring");
2126 continue;
2127 }
2128
2129 min_src_mv = pdo_pps_apdo_min_voltage(pdo);
2130 max_src_mv = pdo_pps_apdo_max_voltage(pdo);
2131 src_ma = pdo_pps_apdo_max_current(pdo);
2132 src_mw = (src_ma * max_src_mv) / 1000;
2133
2134 /*
2135 * Now search through the sink PDOs to find a matching
2136 * PPS APDO. Again skip the first sink PDO as this will
2137 * always be 5V 3A.
2138 */
2139 for (j = i; j < port->nr_snk_pdo; j++) {
2140 pdo = port->snk_pdo[j];
2141
2142 switch (pdo_type(pdo)) {
2143 case PDO_TYPE_APDO:
2144 if (pdo_apdo_type(pdo) != APDO_TYPE_PPS) {
2145 tcpm_log(port,
2146 "Not PPS APDO (sink), ignoring");
2147 continue;
2148 }
2149
2150 min_snk_mv =
2151 pdo_pps_apdo_min_voltage(pdo);
2152 max_snk_mv =
2153 pdo_pps_apdo_max_voltage(pdo);
2154 snk_ma =
2155 pdo_pps_apdo_max_current(pdo);
2156 break;
2157 default:
2158 tcpm_log(port,
2159 "Not APDO type (sink), ignoring");
2160 continue;
2161 }
2162
2163 if (max_src_mv <= max_snk_mv &&
2164 min_src_mv >= min_snk_mv) {
2165 /* Prefer higher voltages if available */
2166 if ((src_mw == max_mw &&
2167 min_src_mv > max_mv) ||
2168 src_mw > max_mw) {
2169 src_pdo = i;
2170 snk_pdo = j;
2171 max_mw = src_mw;
2172 max_mv = max_src_mv;
2173 }
2174 }
2175 }
2176
2177 break;
2178 default:
2179 tcpm_log(port, "Not APDO type (source), ignoring");
2180 continue;
2181 }
2182 }
2183
2184 if (src_pdo) {
2185 pdo = port->source_caps[src_pdo];
2186
2187 port->pps_data.min_volt = pdo_pps_apdo_min_voltage(pdo);
2188 port->pps_data.max_volt = pdo_pps_apdo_max_voltage(pdo);
2189 port->pps_data.max_curr =
2190 min_pps_apdo_current(pdo, port->snk_pdo[snk_pdo]);
2191 port->pps_data.out_volt =
2192 min(pdo_pps_apdo_max_voltage(pdo), port->pps_data.out_volt);
2193 port->pps_data.op_curr =
2194 min(port->pps_data.max_curr, port->pps_data.op_curr);
2195 }
2196
2197 return src_pdo;
2198}
2199
f0690a25
GR		 2200static int tcpm_pd_build_request(struct tcpm_port *port, u32 *rdo)
2201{
2202 unsigned int mv, ma, mw, flags;
2203 unsigned int max_ma, max_mw;
2204 enum pd_pdo_type type;
53fe0de9 2205 u32 pdo, matching_snk_pdo;
0c718676
GKH		 2206 int src_pdo_index = 0;
2207 int snk_pdo_index = 0;
53fe0de9 2208 int ret;
f0690a25 2209
53fe0de9
LJ		 2210 ret = tcpm_pd_select_pdo(port, &snk_pdo_index, &src_pdo_index);
2211 if (ret < 0)
2212 return ret;
2213
2214 pdo = port->source_caps[src_pdo_index];
2215 matching_snk_pdo = port->snk_pdo[snk_pdo_index];
f0690a25
GR		 2216 type = pdo_type(pdo);
2217
2eadc33f
AT		 2218 switch (type) {
2219 case PDO_TYPE_FIXED:
f0690a25 2220 mv = pdo_fixed_voltage(pdo);
2eadc33f
AT		 2221 break;
2222 case PDO_TYPE_BATT:
2223 case PDO_TYPE_VAR:
f0690a25 2224 mv = pdo_min_voltage(pdo);
2eadc33f
AT		 2225 break;
2226 default:
2227 tcpm_log(port, "Invalid PDO selected!");
2228 return -EINVAL;
2229 }
f0690a25 2230
53fe0de9 2231 /* Select maximum available current within the sink pdo's limit */
f0690a25 2232 if (type == PDO_TYPE_BATT) {
53fe0de9
LJ		 2233 mw = min_power(pdo, matching_snk_pdo);
2234 ma = 1000 * mw / mv;
f0690a25 2235 } else {
53fe0de9
LJ		 2236 ma = min_current(pdo, matching_snk_pdo);
2237 mw = ma * mv / 1000;
f0690a25 2238 }
f0690a25 2239
931693f9 2240 flags = RDO_USB_COMM | RDO_NO_SUSPEND;
f0690a25
GR		 2241
2242 /* Set mismatch bit if offered power is less than operating power */
f0690a25
GR		 2243 max_ma = ma;
2244 max_mw = mw;
2245 if (mw < port->operating_snk_mw) {
2246 flags |= RDO_CAP_MISMATCH;
53fe0de9
LJ		 2247 if (type == PDO_TYPE_BATT &&
2248 (pdo_max_power(matching_snk_pdo) > pdo_max_power(pdo)))
2249 max_mw = pdo_max_power(matching_snk_pdo);
2250 else if (pdo_max_current(matching_snk_pdo) >
2251 pdo_max_current(pdo))
2252 max_ma = pdo_max_current(matching_snk_pdo);
f0690a25
GR		 2253 }
2254
2255 tcpm_log(port, "cc=%d cc1=%d cc2=%d vbus=%d vconn=%s polarity=%d",
2256 port->cc_req, port->cc1, port->cc2, port->vbus_source,
2257 port->vconn_role == TYPEC_SOURCE ? "source" : "sink",
2258 port->polarity);
2259
2260 if (type == PDO_TYPE_BATT) {
53fe0de9 2261 *rdo = RDO_BATT(src_pdo_index + 1, mw, max_mw, flags);
f0690a25
GR		 2262
2263 tcpm_log(port, "Requesting PDO %d: %u mV, %u mW%s",
53fe0de9 2264 src_pdo_index, mv, mw,
f0690a25
GR		 2265 flags & RDO_CAP_MISMATCH ? " [mismatch]" : "");
2266 } else {
53fe0de9 2267 *rdo = RDO_FIXED(src_pdo_index + 1, ma, max_ma, flags);
f0690a25
GR		 2268
2269 tcpm_log(port, "Requesting PDO %d: %u mV, %u mA%s",
53fe0de9 2270 src_pdo_index, mv, ma,
f0690a25
GR		 2271 flags & RDO_CAP_MISMATCH ? " [mismatch]" : "");
2272 }
2273
2274 port->current_limit = ma;
2275 port->supply_voltage = mv;
2276
2277 return 0;
2278}
2279
2280static int tcpm_pd_send_request(struct tcpm_port *port)
2281{
2282 struct pd_message msg;
2283 int ret;
2284 u32 rdo;
2285
2286 ret = tcpm_pd_build_request(port, &rdo);
2287 if (ret < 0)
2288 return ret;
2289
2290 memset(&msg, 0, sizeof(msg));
2291 msg.header = PD_HEADER_LE(PD_DATA_REQUEST,
2292 port->pwr_role,
2293 port->data_role,
2eadc33f
AT		 2294 port->negotiated_rev,
2295 port->message_id, 1);
2296 msg.payload[0] = cpu_to_le32(rdo);
2297
2298 return tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
2299}
2300
2301static int tcpm_pd_build_pps_request(struct tcpm_port *port, u32 *rdo)
2302{
2303 unsigned int out_mv, op_ma, op_mw, min_mv, max_mv, max_ma, flags;
2304 enum pd_pdo_type type;
2305 unsigned int src_pdo_index;
2306 u32 pdo;
2307
2308 src_pdo_index = tcpm_pd_select_pps_apdo(port);
2309 if (!src_pdo_index)
2310 return -EOPNOTSUPP;
2311
2312 pdo = port->source_caps[src_pdo_index];
2313 type = pdo_type(pdo);
2314
2315 switch (type) {
2316 case PDO_TYPE_APDO:
2317 if (pdo_apdo_type(pdo) != APDO_TYPE_PPS) {
2318 tcpm_log(port, "Invalid APDO selected!");
2319 return -EINVAL;
2320 }
2321 min_mv = port->pps_data.min_volt;
2322 max_mv = port->pps_data.max_volt;
2323 max_ma = port->pps_data.max_curr;
2324 out_mv = port->pps_data.out_volt;
2325 op_ma = port->pps_data.op_curr;
2326 break;
2327 default:
2328 tcpm_log(port, "Invalid PDO selected!");
2329 return -EINVAL;
2330 }
2331
2332 flags = RDO_USB_COMM | RDO_NO_SUSPEND;
2333
2334 op_mw = (op_ma * out_mv) / 1000;
2335 if (op_mw < port->operating_snk_mw) {
2336 /*
2337 * Try raising current to meet power needs. If that's not enough
2338 * then try upping the voltage. If that's still not enough
2339 * then we've obviously chosen a PPS APDO which really isn't
2340 * suitable so abandon ship.
2341 */
2342 op_ma = (port->operating_snk_mw * 1000) / out_mv;
2343 if ((port->operating_snk_mw * 1000) % out_mv)
2344 ++op_ma;
2345 op_ma += RDO_PROG_CURR_MA_STEP - (op_ma % RDO_PROG_CURR_MA_STEP);
2346
2347 if (op_ma > max_ma) {
2348 op_ma = max_ma;
2349 out_mv = (port->operating_snk_mw * 1000) / op_ma;
2350 if ((port->operating_snk_mw * 1000) % op_ma)
2351 ++out_mv;
2352 out_mv += RDO_PROG_VOLT_MV_STEP -
2353 (out_mv % RDO_PROG_VOLT_MV_STEP);
2354
2355 if (out_mv > max_mv) {
2356 tcpm_log(port, "Invalid PPS APDO selected!");
2357 return -EINVAL;
2358 }
2359 }
2360 }
2361
2362 tcpm_log(port, "cc=%d cc1=%d cc2=%d vbus=%d vconn=%s polarity=%d",
2363 port->cc_req, port->cc1, port->cc2, port->vbus_source,
2364 port->vconn_role == TYPEC_SOURCE ? "source" : "sink",
2365 port->polarity);
2366
2367 *rdo = RDO_PROG(src_pdo_index + 1, out_mv, op_ma, flags);
2368
2369 tcpm_log(port, "Requesting APDO %d: %u mV, %u mA",
2370 src_pdo_index, out_mv, op_ma);
2371
2372 port->pps_data.op_curr = op_ma;
2373 port->pps_data.out_volt = out_mv;
2374
2375 return 0;
2376}
2377
2378static int tcpm_pd_send_pps_request(struct tcpm_port *port)
2379{
2380 struct pd_message msg;
2381 int ret;
2382 u32 rdo;
2383
2384 ret = tcpm_pd_build_pps_request(port, &rdo);
2385 if (ret < 0)
2386 return ret;
2387
2388 memset(&msg, 0, sizeof(msg));
2389 msg.header = PD_HEADER_LE(PD_DATA_REQUEST,
2390 port->pwr_role,
2391 port->data_role,
2392 port->negotiated_rev,
f0690a25
GR		 2393 port->message_id, 1);
2394 msg.payload[0] = cpu_to_le32(rdo);
2395
2396 return tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
2397}
2398
2399static int tcpm_set_vbus(struct tcpm_port *port, bool enable)
2400{
2401 int ret;
2402
2403 if (enable && port->vbus_charge)
2404 return -EINVAL;
2405
2406 tcpm_log(port, "vbus:=%d charge=%d", enable, port->vbus_charge);
2407
2408 ret = port->tcpc->set_vbus(port->tcpc, enable, port->vbus_charge);
2409 if (ret < 0)
2410 return ret;
2411
2412 port->vbus_source = enable;
2413 return 0;
2414}
2415
2416static int tcpm_set_charge(struct tcpm_port *port, bool charge)
2417{
2418 int ret;
2419
2420 if (charge && port->vbus_source)
2421 return -EINVAL;
2422
2423 if (charge != port->vbus_charge) {
2424 tcpm_log(port, "vbus=%d charge:=%d", port->vbus_source, charge);
2425 ret = port->tcpc->set_vbus(port->tcpc, port->vbus_source,
2426 charge);
2427 if (ret < 0)
2428 return ret;
2429 }
2430 port->vbus_charge = charge;
2431 return 0;
2432}
2433
2434static bool tcpm_start_drp_toggling(struct tcpm_port *port)
2435{
2436 int ret;
2437
2438 if (port->tcpc->start_drp_toggling &&
9b0ae699 2439 port->port_type == TYPEC_PORT_DRP) {
f0690a25
GR		 2440 tcpm_log_force(port, "Start DRP toggling");
2441 ret = port->tcpc->start_drp_toggling(port->tcpc,
2442 tcpm_rp_cc(port));
2443 if (!ret)
2444 return true;
2445 }
2446
2447 return false;
2448}
2449
2450static void tcpm_set_cc(struct tcpm_port *port, enum typec_cc_status cc)
2451{
2452 tcpm_log(port, "cc:=%d", cc);
2453 port->cc_req = cc;
2454 port->tcpc->set_cc(port->tcpc, cc);
2455}
2456
2457static int tcpm_init_vbus(struct tcpm_port *port)
2458{
2459 int ret;
2460
2461 ret = port->tcpc->set_vbus(port->tcpc, false, false);
2462 port->vbus_source = false;
2463 port->vbus_charge = false;
2464 return ret;
2465}
2466
2467static int tcpm_init_vconn(struct tcpm_port *port)
2468{
2469 int ret;
2470
2471 ret = port->tcpc->set_vconn(port->tcpc, false);
2472 port->vconn_role = TYPEC_SINK;
2473 return ret;
2474}
2475
2476static void tcpm_typec_connect(struct tcpm_port *port)
2477{
2478 if (!port->connected) {
2479 /* Make sure we don't report stale identity information */
2480 memset(&port->partner_ident, 0, sizeof(port->partner_ident));
2481 port->partner_desc.usb_pd = port->pd_capable;
2482 if (tcpm_port_is_debug(port))
2483 port->partner_desc.accessory = TYPEC_ACCESSORY_DEBUG;
2484 else if (tcpm_port_is_audio(port))
2485 port->partner_desc.accessory = TYPEC_ACCESSORY_AUDIO;
2486 else
2487 port->partner_desc.accessory = TYPEC_ACCESSORY_NONE;
2488 port->partner = typec_register_partner(port->typec_port,
2489 &port->partner_desc);
2490 port->connected = true;
2491 }
2492}
2493
2494static int tcpm_src_attach(struct tcpm_port *port)
2495{
2496 enum typec_cc_polarity polarity =
2497 port->cc2 == TYPEC_CC_RD ? TYPEC_POLARITY_CC2
2498 : TYPEC_POLARITY_CC1;
2499 int ret;
2500
2501 if (port->attached)
2502 return 0;
2503
2504 ret = tcpm_set_polarity(port, polarity);
2505 if (ret < 0)
2506 return ret;
2507
2508 ret = tcpm_set_roles(port, true, TYPEC_SOURCE, TYPEC_HOST);
2509 if (ret < 0)
2510 return ret;
2511
2512 ret = port->tcpc->set_pd_rx(port->tcpc, true);
2513 if (ret < 0)
2514 goto out_disable_mux;
2515
2516 /*
2517 * USB Type-C specification, version 1.2,
2518 * chapter 4.5.2.2.8.1 (Attached.SRC Requirements)
2519 * Enable VCONN only if the non-RD port is set to RA.
2520 */
2521 if ((polarity == TYPEC_POLARITY_CC1 && port->cc2 == TYPEC_CC_RA) ||
2522 (polarity == TYPEC_POLARITY_CC2 && port->cc1 == TYPEC_CC_RA)) {
2523 ret = tcpm_set_vconn(port, true);
2524 if (ret < 0)
2525 goto out_disable_pd;
2526 }
2527
2528 ret = tcpm_set_vbus(port, true);
2529 if (ret < 0)
2530 goto out_disable_vconn;
2531
2532 port->pd_capable = false;
2533
2534 port->partner = NULL;
2535
2536 port->attached = true;
2537 port->send_discover = true;
2538
2539 return 0;
2540
2541out_disable_vconn:
2542 tcpm_set_vconn(port, false);
2543out_disable_pd:
2544 port->tcpc->set_pd_rx(port->tcpc, false);
2545out_disable_mux:
2000016c
HG		 2546 tcpm_mux_set(port, TYPEC_MUX_NONE, USB_ROLE_NONE,
2547 TYPEC_ORIENTATION_NONE);
f0690a25
GR		 2548 return ret;
2549}
2550
2551static void tcpm_typec_disconnect(struct tcpm_port *port)
2552{
2553 if (port->connected) {
2554 typec_unregister_partner(port->partner);
2555 port->partner = NULL;
2556 port->connected = false;
2557 }
2558}
2559
2560static void tcpm_unregister_altmodes(struct tcpm_port *port)
2561{
2562 struct pd_mode_data *modep = &port->mode_data;
2563 int i;
2564
2565 for (i = 0; i < modep->altmodes; i++) {
2566 typec_unregister_altmode(port->partner_altmode[i]);
2567 port->partner_altmode[i] = NULL;
2568 }
2569
2570 memset(modep, 0, sizeof(*modep));
2571}
2572
2573static void tcpm_reset_port(struct tcpm_port *port)
2574{
2575 tcpm_unregister_altmodes(port);
2576 tcpm_typec_disconnect(port);
2577 port->attached = false;
2578 port->pd_capable = false;
2eadc33f 2579 port->pps_data.supported = false;
f0690a25 2580
5fec4b54
GR		 2581 /*
2582 * First Rx ID should be 0; set this to a sentinel of -1 so that
2583 * we can check tcpm_pd_rx_handler() if we had seen it before.
2584 */
2585 port->rx_msgid = -1;
2586
f0690a25
GR		 2587 port->tcpc->set_pd_rx(port->tcpc, false);
2588 tcpm_init_vbus(port); /* also disables charging */
2589 tcpm_init_vconn(port);
2590 tcpm_set_current_limit(port, 0, 0);
2591 tcpm_set_polarity(port, TYPEC_POLARITY_CC1);
2000016c
HG		 2592 tcpm_mux_set(port, TYPEC_MUX_NONE, USB_ROLE_NONE,
2593 TYPEC_ORIENTATION_NONE);
f0690a25
GR		 2594 tcpm_set_attached_state(port, false);
2595 port->try_src_count = 0;
2596 port->try_snk_count = 0;
2eadc33f
AT		 2597 port->supply_voltage = 0;
2598 port->current_limit = 0;
f2a8aa05
AT		 2599 port->usb_type = POWER_SUPPLY_USB_TYPE_C;
2600
2601 power_supply_changed(port->psy);
f0690a25
GR		 2602}
2603
2604static void tcpm_detach(struct tcpm_port *port)
2605{
2606 if (!port->attached)
2607 return;
2608
2609 if (tcpm_port_is_disconnected(port))
2610 port->hard_reset_count = 0;
2611
2612 tcpm_reset_port(port);
2613}
2614
2615static void tcpm_src_detach(struct tcpm_port *port)
2616{
2617 tcpm_detach(port);
2618}
2619
2620static int tcpm_snk_attach(struct tcpm_port *port)
2621{
2622 int ret;
2623
2624 if (port->attached)
2625 return 0;
2626
2627 ret = tcpm_set_polarity(port, port->cc2 != TYPEC_CC_OPEN ?
2628 TYPEC_POLARITY_CC2 : TYPEC_POLARITY_CC1);
2629 if (ret < 0)
2630 return ret;
2631
2632 ret = tcpm_set_roles(port, true, TYPEC_SINK, TYPEC_DEVICE);
2633 if (ret < 0)
2634 return ret;
2635
2636 port->pd_capable = false;
2637
2638 port->partner = NULL;
2639
2640 port->attached = true;
2641 port->send_discover = true;
2642
2643 return 0;
2644}
2645
2646static void tcpm_snk_detach(struct tcpm_port *port)
2647{
2648 tcpm_detach(port);
f0690a25
GR		 2649}
2650
2651static int tcpm_acc_attach(struct tcpm_port *port)
2652{
2653 int ret;
2654
2655 if (port->attached)
2656 return 0;
2657
2658 ret = tcpm_set_roles(port, true, TYPEC_SOURCE, TYPEC_HOST);
2659 if (ret < 0)
2660 return ret;
2661
2662 port->partner = NULL;
2663
2664 tcpm_typec_connect(port);
2665
2666 port->attached = true;
2667
2668 return 0;
2669}
2670
2671static void tcpm_acc_detach(struct tcpm_port *port)
2672{
2673 tcpm_detach(port);
2674}
2675
2676static inline enum tcpm_state hard_reset_state(struct tcpm_port *port)
2677{
2678 if (port->hard_reset_count < PD_N_HARD_RESET_COUNT)
2679 return HARD_RESET_SEND;
2680 if (port->pd_capable)
2681 return ERROR_RECOVERY;
2682 if (port->pwr_role == TYPEC_SOURCE)
2683 return SRC_UNATTACHED;
2684 if (port->state == SNK_WAIT_CAPABILITIES)
2685 return SNK_READY;
2686 return SNK_UNATTACHED;
2687}
2688
f0690a25
GR		 2689static inline enum tcpm_state unattached_state(struct tcpm_port *port)
2690{
13cb492c
BJS		 2691 if (port->port_type == TYPEC_PORT_DRP) {
2692 if (port->pwr_role == TYPEC_SOURCE)
2693 return SRC_UNATTACHED;
2694 else
2695 return SNK_UNATTACHED;
ceeb1625 2696 } else if (port->port_type == TYPEC_PORT_SRC) {
f0690a25 2697 return SRC_UNATTACHED;
13cb492c
BJS		 2698 }
2699
2700 return SNK_UNATTACHED;
f0690a25
GR		 2701}
2702
2703static void tcpm_check_send_discover(struct tcpm_port *port)
2704{
2705 if (port->data_role == TYPEC_HOST && port->send_discover &&
2706 port->pd_capable) {
2707 tcpm_send_vdm(port, USB_SID_PD, CMD_DISCOVER_IDENT, NULL, 0);
2708 port->send_discover = false;
2709 }
2710}
2711
2712static void tcpm_swap_complete(struct tcpm_port *port, int result)
2713{
2714 if (port->swap_pending) {
2715 port->swap_status = result;
2716 port->swap_pending = false;
b17dd571 2717 port->non_pd_role_swap = false;
f0690a25
GR		 2718 complete(&port->swap_complete);
2719 }
2720}
2721
53b70e5c 2722static enum typec_pwr_opmode tcpm_get_pwr_opmode(enum typec_cc_status cc)
fce042f0
BJS		 2723{
2724 switch (cc) {
2725 case TYPEC_CC_RP_1_5:
2726 return TYPEC_PWR_MODE_1_5A;
2727 case TYPEC_CC_RP_3_0:
2728 return TYPEC_PWR_MODE_3_0A;
2729 case TYPEC_CC_RP_DEF:
2730 default:
2731 return TYPEC_PWR_MODE_USB;
2732 }
2733}
2734
f0690a25
GR		 2735static void run_state_machine(struct tcpm_port *port)
2736{
2737 int ret;
fce042f0 2738 enum typec_pwr_opmode opmode;
131c7d12 2739 unsigned int msecs;
f0690a25
GR		 2740
2741 port->enter_state = port->state;
2742 switch (port->state) {
2743 case DRP_TOGGLING:
2744 break;
2745 /* SRC states */
2746 case SRC_UNATTACHED:
b17dd571
GR		 2747 if (!port->non_pd_role_swap)
2748 tcpm_swap_complete(port, -ENOTCONN);
f0690a25
GR		 2749 tcpm_src_detach(port);
2750 if (tcpm_start_drp_toggling(port)) {
2751 tcpm_set_state(port, DRP_TOGGLING, 0);
2752 break;
2753 }
2754 tcpm_set_cc(port, tcpm_rp_cc(port));
9b0ae699 2755 if (port->port_type == TYPEC_PORT_DRP)
f0690a25
GR		 2756 tcpm_set_state(port, SNK_UNATTACHED, PD_T_DRP_SNK);
2757 break;
2758 case SRC_ATTACH_WAIT:
2759 if (tcpm_port_is_debug(port))
2760 tcpm_set_state(port, DEBUG_ACC_ATTACHED,
2761 PD_T_CC_DEBOUNCE);
2762 else if (tcpm_port_is_audio(port))
2763 tcpm_set_state(port, AUDIO_ACC_ATTACHED,
2764 PD_T_CC_DEBOUNCE);
2765 else if (tcpm_port_is_source(port))
2766 tcpm_set_state(port,
2767 tcpm_try_snk(port) ? SNK_TRY
2768 : SRC_ATTACHED,
2769 PD_T_CC_DEBOUNCE);
2770 break;
2771
2772 case SNK_TRY:
2773 port->try_snk_count++;
2774 /*
2775 * Requirements:
2776 * - Do not drive vconn or vbus
2777 * - Terminate CC pins (both) to Rd
2778 * Action:
2779 * - Wait for tDRPTry (PD_T_DRP_TRY).
2780 * Until then, ignore any state changes.
2781 */
2782 tcpm_set_cc(port, TYPEC_CC_RD);
2783 tcpm_set_state(port, SNK_TRY_WAIT, PD_T_DRP_TRY);
2784 break;
2785 case SNK_TRY_WAIT:
a0a3e04e
BJS		 2786 if (tcpm_port_is_sink(port)) {
2787 tcpm_set_state(port, SNK_TRY_WAIT_DEBOUNCE, 0);
2788 } else {
2789 tcpm_set_state(port, SRC_TRYWAIT, 0);
2790 port->max_wait = 0;
2791 }
2792 break;
2793 case SNK_TRY_WAIT_DEBOUNCE:
2794 tcpm_set_state(port, SNK_TRY_WAIT_DEBOUNCE_CHECK_VBUS,
2795 PD_T_PD_DEBOUNCE);
2796 break;
2797 case SNK_TRY_WAIT_DEBOUNCE_CHECK_VBUS:
f0690a25
GR		 2798 if (port->vbus_present && tcpm_port_is_sink(port)) {
2799 tcpm_set_state(port, SNK_ATTACHED, 0);
a0a3e04e
BJS		 2800 } else {
2801 tcpm_set_state(port, SRC_TRYWAIT, 0);
02d5be46 2802 port->max_wait = 0;
f0690a25 2803 }
f0690a25
GR		 2804 break;
2805 case SRC_TRYWAIT:
2806 tcpm_set_cc(port, tcpm_rp_cc(port));
02d5be46
BJS		 2807 if (port->max_wait == 0) {
2808 port->max_wait = jiffies +
2809 msecs_to_jiffies(PD_T_DRP_TRY);
f0690a25
GR		 2810 tcpm_set_state(port, SRC_TRYWAIT_UNATTACHED,
2811 PD_T_DRP_TRY);
02d5be46
BJS		 2812 } else {
2813 if (time_is_after_jiffies(port->max_wait))
2814 tcpm_set_state(port, SRC_TRYWAIT_UNATTACHED,
2815 jiffies_to_msecs(port->max_wait -
2816 jiffies));
2817 else
2818 tcpm_set_state(port, SNK_UNATTACHED, 0);
2819 }
2820 break;
2821 case SRC_TRYWAIT_DEBOUNCE:
2822 tcpm_set_state(port, SRC_ATTACHED, PD_T_CC_DEBOUNCE);
f0690a25
GR		 2823 break;
2824 case SRC_TRYWAIT_UNATTACHED:
2825 tcpm_set_state(port, SNK_UNATTACHED, 0);
2826 break;
2827
2828 case SRC_ATTACHED:
2829 ret = tcpm_src_attach(port);
2830 tcpm_set_state(port, SRC_UNATTACHED,
2831 ret < 0 ? 0 : PD_T_PS_SOURCE_ON);
2832 break;
2833 case SRC_STARTUP:
fce042f0
BJS		 2834 opmode = tcpm_get_pwr_opmode(tcpm_rp_cc(port));
2835 typec_set_pwr_opmode(port->typec_port, opmode);
f0690a25
GR		 2836 port->pwr_opmode = TYPEC_PWR_MODE_USB;
2837 port->caps_count = 0;
2eadc33f 2838 port->negotiated_rev = PD_MAX_REV;
f0690a25 2839 port->message_id = 0;
5fec4b54 2840 port->rx_msgid = -1;
f0690a25
GR		 2841 port->explicit_contract = false;
2842 tcpm_set_state(port, SRC_SEND_CAPABILITIES, 0);
2843 break;
2844 case SRC_SEND_CAPABILITIES:
2845 port->caps_count++;
2846 if (port->caps_count > PD_N_CAPS_COUNT) {
2847 tcpm_set_state(port, SRC_READY, 0);
2848 break;
2849 }
2850 ret = tcpm_pd_send_source_caps(port);
2851 if (ret < 0) {
2852 tcpm_set_state(port, SRC_SEND_CAPABILITIES,
2853 PD_T_SEND_SOURCE_CAP);
2854 } else {
2855 /*
2856 * Per standard, we should clear the reset counter here.
2857 * However, that can result in state machine hang-ups.
2858 * Reset it only in READY state to improve stability.
2859 */
2860 /* port->hard_reset_count = 0; */
2861 port->caps_count = 0;
2862 port->pd_capable = true;
2863 tcpm_set_state_cond(port, hard_reset_state(port),
2864 PD_T_SEND_SOURCE_CAP);
2865 }
2866 break;
2867 case SRC_NEGOTIATE_CAPABILITIES:
2868 ret = tcpm_pd_check_request(port);
2869 if (ret < 0) {
2870 tcpm_pd_send_control(port, PD_CTRL_REJECT);
2871 if (!port->explicit_contract) {
2872 tcpm_set_state(port,
2873 SRC_WAIT_NEW_CAPABILITIES, 0);
2874 } else {
2875 tcpm_set_state(port, SRC_READY, 0);
2876 }
2877 } else {
2878 tcpm_pd_send_control(port, PD_CTRL_ACCEPT);
2879 tcpm_set_state(port, SRC_TRANSITION_SUPPLY,
2880 PD_T_SRC_TRANSITION);
2881 }
2882 break;
2883 case SRC_TRANSITION_SUPPLY:
2884 /* XXX: regulator_set_voltage(vbus, ...) */
2885 tcpm_pd_send_control(port, PD_CTRL_PS_RDY);
2886 port->explicit_contract = true;
2887 typec_set_pwr_opmode(port->typec_port, TYPEC_PWR_MODE_PD);
2888 port->pwr_opmode = TYPEC_PWR_MODE_PD;
2889 tcpm_set_state_cond(port, SRC_READY, 0);
2890 break;
2891 case SRC_READY:
2892#if 1
2893 port->hard_reset_count = 0;
2894#endif
2895 port->try_src_count = 0;
2896
3113bf1a 2897 tcpm_swap_complete(port, 0);
f0690a25 2898 tcpm_typec_connect(port);
2eadc33f 2899
f0690a25
GR		 2900 tcpm_check_send_discover(port);
2901 /*
2902 * 6.3.5
2903 * Sending ping messages is not necessary if
2904 * - the source operates at vSafe5V
2905 * or
2906 * - The system is not operating in PD mode
2907 * or
2908 * - Both partners are connected using a Type-C connector
f451ac9e
BJS		 2909 *
2910 * There is no actual need to send PD messages since the local
2911 * port type-c and the spec does not clearly say whether PD is
2912 * possible when type-c is connected to Type-A/B
f0690a25 2913 */
f0690a25
GR		 2914 break;
2915 case SRC_WAIT_NEW_CAPABILITIES:
2916 /* Nothing to do... */
2917 break;
2918
2919 /* SNK states */
2920 case SNK_UNATTACHED:
b17dd571
GR		 2921 if (!port->non_pd_role_swap)
2922 tcpm_swap_complete(port, -ENOTCONN);
2eadc33f 2923 tcpm_pps_complete(port, -ENOTCONN);
f0690a25
GR		 2924 tcpm_snk_detach(port);
2925 if (tcpm_start_drp_toggling(port)) {
2926 tcpm_set_state(port, DRP_TOGGLING, 0);
2927 break;
2928 }
2929 tcpm_set_cc(port, TYPEC_CC_RD);
9b0ae699 2930 if (port->port_type == TYPEC_PORT_DRP)
f0690a25
GR		 2931 tcpm_set_state(port, SRC_UNATTACHED, PD_T_DRP_SRC);
2932 break;
2933 case SNK_ATTACH_WAIT:
2934 if ((port->cc1 == TYPEC_CC_OPEN &&
2935 port->cc2 != TYPEC_CC_OPEN) ||
2936 (port->cc1 != TYPEC_CC_OPEN &&
2937 port->cc2 == TYPEC_CC_OPEN))
2938 tcpm_set_state(port, SNK_DEBOUNCED,
2939 PD_T_CC_DEBOUNCE);
2940 else if (tcpm_port_is_disconnected(port))
2941 tcpm_set_state(port, SNK_UNATTACHED,
2942 PD_T_PD_DEBOUNCE);
2943 break;
2944 case SNK_DEBOUNCED:
2945 if (tcpm_port_is_disconnected(port))
2946 tcpm_set_state(port, SNK_UNATTACHED,
2947 PD_T_PD_DEBOUNCE);
2948 else if (port->vbus_present)
2949 tcpm_set_state(port,
2950 tcpm_try_src(port) ? SRC_TRY
2951 : SNK_ATTACHED,
2952 0);
2953 else
2954 /* Wait for VBUS, but not forever */
56277035 2955 tcpm_set_state(port, PORT_RESET, PD_T_PS_SOURCE_ON);
f0690a25
GR		 2956 break;
2957
2958 case SRC_TRY:
2959 port->try_src_count++;
2960 tcpm_set_cc(port, tcpm_rp_cc(port));
131c7d12
BJS		 2961 port->max_wait = 0;
2962 tcpm_set_state(port, SRC_TRY_WAIT, 0);
2963 break;
2964 case SRC_TRY_WAIT:
2965 if (port->max_wait == 0) {
2966 port->max_wait = jiffies +
2967 msecs_to_jiffies(PD_T_DRP_TRY);
2968 msecs = PD_T_DRP_TRY;
2969 } else {
2970 if (time_is_after_jiffies(port->max_wait))
2971 msecs = jiffies_to_msecs(port->max_wait -
2972 jiffies);
2973 else
2974 msecs = 0;
2975 }
2976 tcpm_set_state(port, SNK_TRYWAIT, msecs);
f0690a25
GR		 2977 break;
2978 case SRC_TRY_DEBOUNCE:
2979 tcpm_set_state(port, SRC_ATTACHED, PD_T_PD_DEBOUNCE);
2980 break;
2981 case SNK_TRYWAIT:
2982 tcpm_set_cc(port, TYPEC_CC_RD);
af450ebb 2983 tcpm_set_state(port, SNK_TRYWAIT_VBUS, PD_T_CC_DEBOUNCE);
f0690a25 2984 break;
af450ebb
BJS		 2985 case SNK_TRYWAIT_VBUS:
2986 /*
2987 * TCPM stays in this state indefinitely until VBUS
2988 * is detected as long as Rp is not detected for
2989 * more than a time period of tPDDebounce.
2990 */
2991 if (port->vbus_present && tcpm_port_is_sink(port)) {
f0690a25
GR		 2992 tcpm_set_state(port, SNK_ATTACHED, 0);
2993 break;
2994 }
af450ebb
BJS		 2995 if (!tcpm_port_is_sink(port))
2996 tcpm_set_state(port, SNK_TRYWAIT_DEBOUNCE, 0);
f0690a25 2997 break;
af450ebb
BJS		 2998 case SNK_TRYWAIT_DEBOUNCE:
2999 tcpm_set_state(port, SNK_UNATTACHED, PD_T_PD_DEBOUNCE);
f0690a25 3000 break;
f0690a25
GR		 3001 case SNK_ATTACHED:
3002 ret = tcpm_snk_attach(port);
3003 if (ret < 0)
3004 tcpm_set_state(port, SNK_UNATTACHED, 0);
3005 else
3006 tcpm_set_state(port, SNK_STARTUP, 0);
3007 break;
3008 case SNK_STARTUP:
fce042f0
BJS		 3009 opmode = tcpm_get_pwr_opmode(port->polarity ?
3010 port->cc2 : port->cc1);
3011 typec_set_pwr_opmode(port->typec_port, opmode);
f0690a25 3012 port->pwr_opmode = TYPEC_PWR_MODE_USB;
2eadc33f 3013 port->negotiated_rev = PD_MAX_REV;
f0690a25 3014 port->message_id = 0;
5fec4b54 3015 port->rx_msgid = -1;
f0690a25
GR		 3016 port->explicit_contract = false;
3017 tcpm_set_state(port, SNK_DISCOVERY, 0);
3018 break;
3019 case SNK_DISCOVERY:
3020 if (port->vbus_present) {
3021 tcpm_set_current_limit(port,
3022 tcpm_get_current_limit(port),
3023 5000);
3024 tcpm_set_charge(port, true);
3025 tcpm_set_state(port, SNK_WAIT_CAPABILITIES, 0);
3026 break;
3027 }
3028 /*
3029 * For DRP, timeouts differ. Also, handling is supposed to be
3030 * different and much more complex (dead battery detection;
3031 * see USB power delivery specification, section 8.3.3.6.1.5.1).
3032 */
3033 tcpm_set_state(port, hard_reset_state(port),
9b0ae699 3034 port->port_type == TYPEC_PORT_DRP ?
f0690a25
GR		 3035 PD_T_DB_DETECT : PD_T_NO_RESPONSE);
3036 break;
3037 case SNK_DISCOVERY_DEBOUNCE:
3038 tcpm_set_state(port, SNK_DISCOVERY_DEBOUNCE_DONE,
3039 PD_T_CC_DEBOUNCE);
3040 break;
3041 case SNK_DISCOVERY_DEBOUNCE_DONE:
3042 if (!tcpm_port_is_disconnected(port) &&
3043 tcpm_port_is_sink(port) &&
3044 time_is_after_jiffies(port->delayed_runtime)) {
3045 tcpm_set_state(port, SNK_DISCOVERY,
3046 port->delayed_runtime - jiffies);
3047 break;
3048 }
3049 tcpm_set_state(port, unattached_state(port), 0);
3050 break;
3051 case SNK_WAIT_CAPABILITIES:
3052 ret = port->tcpc->set_pd_rx(port->tcpc, true);
3053 if (ret < 0) {
3054 tcpm_set_state(port, SNK_READY, 0);
3055 break;
3056 }
3057 /*
3058 * If VBUS has never been low, and we time out waiting
3059 * for source cap, try a soft reset first, in case we
3060 * were already in a stable contract before this boot.
3061 * Do this only once.
3062 */
3063 if (port->vbus_never_low) {
3064 port->vbus_never_low = false;
3065 tcpm_set_state(port, SOFT_RESET_SEND,
3066 PD_T_SINK_WAIT_CAP);
3067 } else {
3068 tcpm_set_state(port, hard_reset_state(port),
3069 PD_T_SINK_WAIT_CAP);
3070 }
3071 break;
3072 case SNK_NEGOTIATE_CAPABILITIES:
3073 port->pd_capable = true;
3074 port->hard_reset_count = 0;
3075 ret = tcpm_pd_send_request(port);
3076 if (ret < 0) {
3077 /* Let the Source send capabilities again. */
3078 tcpm_set_state(port, SNK_WAIT_CAPABILITIES, 0);
3079 } else {
3080 tcpm_set_state_cond(port, hard_reset_state(port),
3081 PD_T_SENDER_RESPONSE);
3082 }
3083 break;
2eadc33f
AT		 3084 case SNK_NEGOTIATE_PPS_CAPABILITIES:
3085 ret = tcpm_pd_send_pps_request(port);
3086 if (ret < 0) {
3087 port->pps_status = ret;
3088 /*
3089 * If this was called due to updates to sink
3090 * capabilities, and pps is no longer valid, we should
3091 * safely fall back to a standard PDO.
3092 */
3093 if (port->update_sink_caps)
3094 tcpm_set_state(port, SNK_NEGOTIATE_CAPABILITIES, 0);
3095 else
3096 tcpm_set_state(port, SNK_READY, 0);
3097 } else {
3098 tcpm_set_state_cond(port, hard_reset_state(port),
3099 PD_T_SENDER_RESPONSE);
3100 }
3101 break;
f0690a25
GR		 3102 case SNK_TRANSITION_SINK:
3103 case SNK_TRANSITION_SINK_VBUS:
3104 tcpm_set_state(port, hard_reset_state(port),
3105 PD_T_PS_TRANSITION);
3106 break;
3107 case SNK_READY:
3108 port->try_snk_count = 0;
2eadc33f 3109 port->update_sink_caps = false;
8bf05746
BJS		 3110 if (port->explicit_contract) {
3111 typec_set_pwr_opmode(port->typec_port,
3112 TYPEC_PWR_MODE_PD);
3113 port->pwr_opmode = TYPEC_PWR_MODE_PD;
3114 }
f0690a25 3115
3113bf1a 3116 tcpm_swap_complete(port, 0);
f0690a25 3117 tcpm_typec_connect(port);
f0690a25 3118 tcpm_check_send_discover(port);
2eadc33f
AT		 3119 tcpm_pps_complete(port, port->pps_status);
3120
f2a8aa05
AT		 3121 power_supply_changed(port->psy);
3122
f0690a25
GR		 3123 break;
3124
3125 /* Accessory states */
3126 case ACC_UNATTACHED:
3127 tcpm_acc_detach(port);
3128 tcpm_set_state(port, SRC_UNATTACHED, 0);
3129 break;
3130 case DEBUG_ACC_ATTACHED:
3131 case AUDIO_ACC_ATTACHED:
3132 ret = tcpm_acc_attach(port);
3133 if (ret < 0)
3134 tcpm_set_state(port, ACC_UNATTACHED, 0);
3135 break;
3136 case AUDIO_ACC_DEBOUNCE:
3137 tcpm_set_state(port, ACC_UNATTACHED, PD_T_CC_DEBOUNCE);
3138 break;
3139
3140 /* Hard_Reset states */
3141 case HARD_RESET_SEND:
3142 tcpm_pd_transmit(port, TCPC_TX_HARD_RESET, NULL);
3143 tcpm_set_state(port, HARD_RESET_START, 0);
3144 break;
3145 case HARD_RESET_START:
3146 port->hard_reset_count++;
3147 port->tcpc->set_pd_rx(port->tcpc, false);
3148 tcpm_unregister_altmodes(port);
3149 port->send_discover = true;
3150 if (port->pwr_role == TYPEC_SOURCE)
3151 tcpm_set_state(port, SRC_HARD_RESET_VBUS_OFF,
3152 PD_T_PS_HARD_RESET);
3153 else
3154 tcpm_set_state(port, SNK_HARD_RESET_SINK_OFF, 0);
3155 break;
3156 case SRC_HARD_RESET_VBUS_OFF:
3157 tcpm_set_vconn(port, true);
3158 tcpm_set_vbus(port, false);
3159 tcpm_set_roles(port, false, TYPEC_SOURCE, TYPEC_HOST);
3160 tcpm_set_state(port, SRC_HARD_RESET_VBUS_ON, PD_T_SRC_RECOVER);
3161 break;
3162 case SRC_HARD_RESET_VBUS_ON:
3163 tcpm_set_vbus(port, true);
3164 port->tcpc->set_pd_rx(port->tcpc, true);
3165 tcpm_set_attached_state(port, true);
3166 tcpm_set_state(port, SRC_UNATTACHED, PD_T_PS_SOURCE_ON);
3167 break;
3168 case SNK_HARD_RESET_SINK_OFF:
2eadc33f 3169 memset(&port->pps_data, 0, sizeof(port->pps_data));
f0690a25
GR		 3170 tcpm_set_vconn(port, false);
3171 tcpm_set_charge(port, false);
3172 tcpm_set_roles(port, false, TYPEC_SINK, TYPEC_DEVICE);
3173 /*
3174 * VBUS may or may not toggle, depending on the adapter.
3175 * If it doesn't toggle, transition to SNK_HARD_RESET_SINK_ON
3176 * directly after timeout.
3177 */
3178 tcpm_set_state(port, SNK_HARD_RESET_SINK_ON, PD_T_SAFE_0V);
3179 break;
3180 case SNK_HARD_RESET_WAIT_VBUS:
3181 /* Assume we're disconnected if VBUS doesn't come back. */
3182 tcpm_set_state(port, SNK_UNATTACHED,
3183 PD_T_SRC_RECOVER_MAX + PD_T_SRC_TURN_ON);
3184 break;
3185 case SNK_HARD_RESET_SINK_ON:
3186 /* Note: There is no guarantee that VBUS is on in this state */
3187 /*
3188 * XXX:
3189 * The specification suggests that dual mode ports in sink
3190 * mode should transition to state PE_SRC_Transition_to_default.
3191 * See USB power delivery specification chapter 8.3.3.6.1.3.
3192 * This would mean to to
3193 * - turn off VCONN, reset power supply
3194 * - request hardware reset
3195 * - turn on VCONN
3196 * - Transition to state PE_Src_Startup
3197 * SNK only ports shall transition to state Snk_Startup
3198 * (see chapter 8.3.3.3.8).
3199 * Similar, dual-mode ports in source mode should transition
3200 * to PE_SNK_Transition_to_default.
3201 */
3202 tcpm_set_attached_state(port, true);
3203 tcpm_set_state(port, SNK_STARTUP, 0);
3204 break;
3205
3206 /* Soft_Reset states */
3207 case SOFT_RESET:
3208 port->message_id = 0;
5fec4b54 3209 port->rx_msgid = -1;
f0690a25
GR		 3210 tcpm_pd_send_control(port, PD_CTRL_ACCEPT);
3211 if (port->pwr_role == TYPEC_SOURCE)
3212 tcpm_set_state(port, SRC_SEND_CAPABILITIES, 0);
3213 else
3214 tcpm_set_state(port, SNK_WAIT_CAPABILITIES, 0);
3215 break;
3216 case SOFT_RESET_SEND:
3217 port->message_id = 0;
5fec4b54 3218 port->rx_msgid = -1;
f0690a25
GR		 3219 if (tcpm_pd_send_control(port, PD_CTRL_SOFT_RESET))
3220 tcpm_set_state_cond(port, hard_reset_state(port), 0);
3221 else
3222 tcpm_set_state_cond(port, hard_reset_state(port),
3223 PD_T_SENDER_RESPONSE);
3224 break;
3225
3226 /* DR_Swap states */
3227 case DR_SWAP_SEND:
3228 tcpm_pd_send_control(port, PD_CTRL_DR_SWAP);
3229 tcpm_set_state_cond(port, DR_SWAP_SEND_TIMEOUT,
3230 PD_T_SENDER_RESPONSE);
3231 break;
3232 case DR_SWAP_ACCEPT:
3233 tcpm_pd_send_control(port, PD_CTRL_ACCEPT);
3234 tcpm_set_state_cond(port, DR_SWAP_CHANGE_DR, 0);
3235 break;
3236 case DR_SWAP_SEND_TIMEOUT:
3237 tcpm_swap_complete(port, -ETIMEDOUT);
3238 tcpm_set_state(port, ready_state(port), 0);
3239 break;
3240 case DR_SWAP_CHANGE_DR:
3241 if (port->data_role == TYPEC_HOST) {
3242 tcpm_unregister_altmodes(port);
3243 tcpm_set_roles(port, true, port->pwr_role,
3244 TYPEC_DEVICE);
3245 } else {
3246 tcpm_set_roles(port, true, port->pwr_role,
3247 TYPEC_HOST);
3248 port->send_discover = true;
3249 }
f0690a25
GR		 3250 tcpm_set_state(port, ready_state(port), 0);
3251 break;
3252
3253 /* PR_Swap states */
3254 case PR_SWAP_ACCEPT:
3255 tcpm_pd_send_control(port, PD_CTRL_ACCEPT);
3256 tcpm_set_state(port, PR_SWAP_START, 0);
3257 break;
3258 case PR_SWAP_SEND:
3259 tcpm_pd_send_control(port, PD_CTRL_PR_SWAP);
3260 tcpm_set_state_cond(port, PR_SWAP_SEND_TIMEOUT,
3261 PD_T_SENDER_RESPONSE);
3262 break;
3263 case PR_SWAP_SEND_TIMEOUT:
3264 tcpm_swap_complete(port, -ETIMEDOUT);
3265 tcpm_set_state(port, ready_state(port), 0);
3266 break;
3267 case PR_SWAP_START:
3268 if (port->pwr_role == TYPEC_SOURCE)
3269 tcpm_set_state(port, PR_SWAP_SRC_SNK_TRANSITION_OFF,
3270 PD_T_SRC_TRANSITION);
3271 else
3272 tcpm_set_state(port, PR_SWAP_SNK_SRC_SINK_OFF, 0);
3273 break;
3274 case PR_SWAP_SRC_SNK_TRANSITION_OFF:
3275 tcpm_set_vbus(port, false);
3276 port->explicit_contract = false;
b965b631 3277 /* allow time for Vbus discharge, must be < tSrcSwapStdby */
f0690a25 3278 tcpm_set_state(port, PR_SWAP_SRC_SNK_SOURCE_OFF,
b965b631 3279 PD_T_SRCSWAPSTDBY);
f0690a25
GR		 3280 break;
3281 case PR_SWAP_SRC_SNK_SOURCE_OFF:
3282 tcpm_set_cc(port, TYPEC_CC_RD);
b965b631
BJS		 3283 /* allow CC debounce */
3284 tcpm_set_state(port, PR_SWAP_SRC_SNK_SOURCE_OFF_CC_DEBOUNCED,
3285 PD_T_CC_DEBOUNCE);
3286 break;
3287 case PR_SWAP_SRC_SNK_SOURCE_OFF_CC_DEBOUNCED:
050161ea
GR		 3288 /*
3289 * USB-PD standard, 6.2.1.4, Port Power Role:
3290 * "During the Power Role Swap Sequence, for the initial Source
3291 * Port, the Port Power Role field shall be set to Sink in the
3292 * PS_RDY Message indicating that the initial Source’s power
3293 * supply is turned off"
3294 */
3295 tcpm_set_pwr_role(port, TYPEC_SINK);
f0690a25
GR		 3296 if (tcpm_pd_send_control(port, PD_CTRL_PS_RDY)) {
3297 tcpm_set_state(port, ERROR_RECOVERY, 0);
3298 break;
3299 }
3300 tcpm_set_state_cond(port, SNK_UNATTACHED, PD_T_PS_SOURCE_ON);
3301 break;
3302 case PR_SWAP_SRC_SNK_SINK_ON:
f0690a25
GR		 3303 tcpm_set_state(port, SNK_STARTUP, 0);
3304 break;
3305 case PR_SWAP_SNK_SRC_SINK_OFF:
3306 tcpm_set_charge(port, false);
3307 tcpm_set_state(port, hard_reset_state(port),
3308 PD_T_PS_SOURCE_OFF);
3309 break;
3310 case PR_SWAP_SNK_SRC_SOURCE_ON:
3311 tcpm_set_cc(port, tcpm_rp_cc(port));
3312 tcpm_set_vbus(port, true);
b965b631
BJS		 3313 /*
3314 * allow time VBUS ramp-up, must be < tNewSrc
3315 * Also, this window overlaps with CC debounce as well.
3316 * So, Wait for the max of two which is PD_T_NEWSRC
3317 */
3318 tcpm_set_state(port, PR_SWAP_SNK_SRC_SOURCE_ON_VBUS_RAMPED_UP,
3319 PD_T_NEWSRC);
3320 break;
3321 case PR_SWAP_SNK_SRC_SOURCE_ON_VBUS_RAMPED_UP:
050161ea
GR		 3322 /*
3323 * USB PD standard, 6.2.1.4:
3324 * "Subsequent Messages initiated by the Policy Engine,
3325 * such as the PS_RDY Message sent to indicate that Vbus
3326 * is ready, will have the Port Power Role field set to
3327 * Source."
3328 */
f0690a25 3329 tcpm_set_pwr_role(port, TYPEC_SOURCE);
050161ea 3330 tcpm_pd_send_control(port, PD_CTRL_PS_RDY);
f0690a25
GR		 3331 tcpm_set_state(port, SRC_STARTUP, 0);
3332 break;
3333
3334 case VCONN_SWAP_ACCEPT:
3335 tcpm_pd_send_control(port, PD_CTRL_ACCEPT);
3336 tcpm_set_state(port, VCONN_SWAP_START, 0);
3337 break;
3338 case VCONN_SWAP_SEND:
3339 tcpm_pd_send_control(port, PD_CTRL_VCONN_SWAP);
3340 tcpm_set_state(port, VCONN_SWAP_SEND_TIMEOUT,
3341 PD_T_SENDER_RESPONSE);
3342 break;
3343 case VCONN_SWAP_SEND_TIMEOUT:
3344 tcpm_swap_complete(port, -ETIMEDOUT);
3345 tcpm_set_state(port, ready_state(port), 0);
3346 break;
3347 case VCONN_SWAP_START:
3348 if (port->vconn_role == TYPEC_SOURCE)
3349 tcpm_set_state(port, VCONN_SWAP_WAIT_FOR_VCONN, 0);
3350 else
3351 tcpm_set_state(port, VCONN_SWAP_TURN_ON_VCONN, 0);
3352 break;
3353 case VCONN_SWAP_WAIT_FOR_VCONN:
3354 tcpm_set_state(port, hard_reset_state(port),
3355 PD_T_VCONN_SOURCE_ON);
3356 break;
3357 case VCONN_SWAP_TURN_ON_VCONN:
3358 tcpm_set_vconn(port, true);
3359 tcpm_pd_send_control(port, PD_CTRL_PS_RDY);
f0690a25
GR		 3360 tcpm_set_state(port, ready_state(port), 0);
3361 break;
3362 case VCONN_SWAP_TURN_OFF_VCONN:
3363 tcpm_set_vconn(port, false);
f0690a25
GR		 3364 tcpm_set_state(port, ready_state(port), 0);
3365 break;
3366
3367 case DR_SWAP_CANCEL:
3368 case PR_SWAP_CANCEL:
3369 case VCONN_SWAP_CANCEL:
3370 tcpm_swap_complete(port, port->swap_status);
3371 if (port->pwr_role == TYPEC_SOURCE)
3372 tcpm_set_state(port, SRC_READY, 0);
3373 else
3374 tcpm_set_state(port, SNK_READY, 0);
3375 break;
3376
3377 case BIST_RX:
3378 switch (BDO_MODE_MASK(port->bist_request)) {
3379 case BDO_MODE_CARRIER2:
3380 tcpm_pd_transmit(port, TCPC_TX_BIST_MODE_2, NULL);
3381 break;
3382 default:
3383 break;
3384 }
3385 /* Always switch to unattached state */
3386 tcpm_set_state(port, unattached_state(port), 0);
3387 break;
64f7c494
AT		 3388 case GET_STATUS_SEND:
3389 tcpm_pd_send_control(port, PD_CTRL_GET_STATUS);
3390 tcpm_set_state(port, GET_STATUS_SEND_TIMEOUT,
3391 PD_T_SENDER_RESPONSE);
3392 break;
3393 case GET_STATUS_SEND_TIMEOUT:
3394 tcpm_set_state(port, ready_state(port), 0);
3395 break;
3396 case GET_PPS_STATUS_SEND:
3397 tcpm_pd_send_control(port, PD_CTRL_GET_PPS_STATUS);
3398 tcpm_set_state(port, GET_PPS_STATUS_SEND_TIMEOUT,
3399 PD_T_SENDER_RESPONSE);
3400 break;
3401 case GET_PPS_STATUS_SEND_TIMEOUT:
3402 tcpm_set_state(port, ready_state(port), 0);
3403 break;
f0690a25
GR		 3404 case ERROR_RECOVERY:
3405 tcpm_swap_complete(port, -EPROTO);
2eadc33f 3406 tcpm_pps_complete(port, -EPROTO);
b17dd571
GR		 3407 tcpm_set_state(port, PORT_RESET, 0);
3408 break;
3409 case PORT_RESET:
f0690a25 3410 tcpm_reset_port(port);
f0690a25 3411 tcpm_set_cc(port, TYPEC_CC_OPEN);
b17dd571 3412 tcpm_set_state(port, PORT_RESET_WAIT_OFF,
f0690a25
GR		 3413 PD_T_ERROR_RECOVERY);
3414 break;
b17dd571 3415 case PORT_RESET_WAIT_OFF:
f0690a25
GR		 3416 tcpm_set_state(port,
3417 tcpm_default_state(port),
3418 port->vbus_present ? PD_T_PS_SOURCE_OFF : 0);
3419 break;
3420 default:
3421 WARN(1, "Unexpected port state %d\n", port->state);
3422 break;
3423 }
3424}
3425
3426static void tcpm_state_machine_work(struct work_struct *work)
3427{
3428 struct tcpm_port *port = container_of(work, struct tcpm_port,
3429 state_machine.work);
3430 enum tcpm_state prev_state;
3431
3432 mutex_lock(&port->lock);
3433 port->state_machine_running = true;
3434
3435 if (port->queued_message && tcpm_send_queued_message(port))
3436 goto done;
3437
3438 /* If we were queued due to a delayed state change, update it now */
3439 if (port->delayed_state) {
3440 tcpm_log(port, "state change %s -> %s [delayed %ld ms]",
3441 tcpm_states[port->state],
3442 tcpm_states[port->delayed_state], port->delay_ms);
3443 port->prev_state = port->state;
3444 port->state = port->delayed_state;
3445 port->delayed_state = INVALID_STATE;
3446 }
3447
3448 /*
3449 * Continue running as long as we have (non-delayed) state changes
3450 * to make.
3451 */
3452 do {
3453 prev_state = port->state;
3454 run_state_machine(port);
3455 if (port->queued_message)
3456 tcpm_send_queued_message(port);
3457 } while (port->state != prev_state && !port->delayed_state);
3458
3459done:
3460 port->state_machine_running = false;
3461 mutex_unlock(&port->lock);
3462}
3463
3464static void _tcpm_cc_change(struct tcpm_port *port, enum typec_cc_status cc1,
3465 enum typec_cc_status cc2)
3466{
3467 enum typec_cc_status old_cc1, old_cc2;
3468 enum tcpm_state new_state;
3469
3470 old_cc1 = port->cc1;
3471 old_cc2 = port->cc2;
3472 port->cc1 = cc1;
3473 port->cc2 = cc2;
3474
3475 tcpm_log_force(port,
3476 "CC1: %u -> %u, CC2: %u -> %u [state %s, polarity %d, %s]",
3477 old_cc1, cc1, old_cc2, cc2, tcpm_states[port->state],
3478 port->polarity,
3479 tcpm_port_is_disconnected(port) ? "disconnected"
3480 : "connected");
3481
3482 switch (port->state) {
3483 case DRP_TOGGLING:
3484 if (tcpm_port_is_debug(port) || tcpm_port_is_audio(port) ||
3485 tcpm_port_is_source(port))
3486 tcpm_set_state(port, SRC_ATTACH_WAIT, 0);
3487 else if (tcpm_port_is_sink(port))
3488 tcpm_set_state(port, SNK_ATTACH_WAIT, 0);
3489 break;
3490 case SRC_UNATTACHED:
3491 case ACC_UNATTACHED:
3492 if (tcpm_port_is_debug(port) || tcpm_port_is_audio(port) ||
3493 tcpm_port_is_source(port))
3494 tcpm_set_state(port, SRC_ATTACH_WAIT, 0);
3495 break;
3496 case SRC_ATTACH_WAIT:
3497 if (tcpm_port_is_disconnected(port) ||
3498 tcpm_port_is_audio_detached(port))
3499 tcpm_set_state(port, SRC_UNATTACHED, 0);
3500 else if (cc1 != old_cc1 || cc2 != old_cc2)
3501 tcpm_set_state(port, SRC_ATTACH_WAIT, 0);
3502 break;
3503 case SRC_ATTACHED:
f3b73364
BJS		 3504 case SRC_SEND_CAPABILITIES:
3505 case SRC_READY:
3506 if (tcpm_port_is_disconnected(port) ||
3507 !tcpm_port_is_source(port))
f0690a25
GR		 3508 tcpm_set_state(port, SRC_UNATTACHED, 0);
3509 break;
f0690a25
GR		 3510 case SNK_UNATTACHED:
3511 if (tcpm_port_is_sink(port))
3512 tcpm_set_state(port, SNK_ATTACH_WAIT, 0);
3513 break;
3514 case SNK_ATTACH_WAIT:
3515 if ((port->cc1 == TYPEC_CC_OPEN &&
3516 port->cc2 != TYPEC_CC_OPEN) ||
3517 (port->cc1 != TYPEC_CC_OPEN &&
3518 port->cc2 == TYPEC_CC_OPEN))
3519 new_state = SNK_DEBOUNCED;
3520 else if (tcpm_port_is_disconnected(port))
3521 new_state = SNK_UNATTACHED;
3522 else
3523 break;
3524 if (new_state != port->delayed_state)
3525 tcpm_set_state(port, SNK_ATTACH_WAIT, 0);
3526 break;
3527 case SNK_DEBOUNCED:
3528 if (tcpm_port_is_disconnected(port))
3529 new_state = SNK_UNATTACHED;
3530 else if (port->vbus_present)
3531 new_state = tcpm_try_src(port) ? SRC_TRY : SNK_ATTACHED;
3532 else
3533 new_state = SNK_UNATTACHED;
3534 if (new_state != port->delayed_state)
3535 tcpm_set_state(port, SNK_DEBOUNCED, 0);
3536 break;
3537 case SNK_READY:
3538 if (tcpm_port_is_disconnected(port))
3539 tcpm_set_state(port, unattached_state(port), 0);
3540 else if (!port->pd_capable &&
3541 (cc1 != old_cc1 || cc2 != old_cc2))
3542 tcpm_set_current_limit(port,
3543 tcpm_get_current_limit(port),
3544 5000);
3545 break;
3546
3547 case AUDIO_ACC_ATTACHED:
3548 if (cc1 == TYPEC_CC_OPEN || cc2 == TYPEC_CC_OPEN)
3549 tcpm_set_state(port, AUDIO_ACC_DEBOUNCE, 0);
3550 break;
3551 case AUDIO_ACC_DEBOUNCE:
3552 if (tcpm_port_is_audio(port))
3553 tcpm_set_state(port, AUDIO_ACC_ATTACHED, 0);
3554 break;
3555
3556 case DEBUG_ACC_ATTACHED:
3557 if (cc1 == TYPEC_CC_OPEN || cc2 == TYPEC_CC_OPEN)
3558 tcpm_set_state(port, ACC_UNATTACHED, 0);
3559 break;
3560
3561 case SNK_TRY:
3562 /* Do nothing, waiting for timeout */
3563 break;
3564
3565 case SNK_DISCOVERY:
3566 /* CC line is unstable, wait for debounce */
3567 if (tcpm_port_is_disconnected(port))
3568 tcpm_set_state(port, SNK_DISCOVERY_DEBOUNCE, 0);
3569 break;
3570 case SNK_DISCOVERY_DEBOUNCE:
3571 break;
3572
3573 case SRC_TRYWAIT:
3574 /* Hand over to state machine if needed */
3575 if (!port->vbus_present && tcpm_port_is_source(port))
02d5be46
BJS		 3576 tcpm_set_state(port, SRC_TRYWAIT_DEBOUNCE, 0);
3577 break;
3578 case SRC_TRYWAIT_DEBOUNCE:
3579 if (port->vbus_present || !tcpm_port_is_source(port))
f0690a25
GR		 3580 tcpm_set_state(port, SRC_TRYWAIT, 0);
3581 break;
a0a3e04e
BJS		 3582 case SNK_TRY_WAIT_DEBOUNCE:
3583 if (!tcpm_port_is_sink(port)) {
3584 port->max_wait = 0;
3585 tcpm_set_state(port, SRC_TRYWAIT, 0);
f0690a25 3586 }
f0690a25 3587 break;
131c7d12 3588 case SRC_TRY_WAIT:
c79d92bd
BJS		 3589 if (tcpm_port_is_source(port))
3590 tcpm_set_state(port, SRC_TRY_DEBOUNCE, 0);
f0690a25
GR		 3591 break;
3592 case SRC_TRY_DEBOUNCE:
131c7d12 3593 tcpm_set_state(port, SRC_TRY_WAIT, 0);
f0690a25
GR		 3594 break;
3595 case SNK_TRYWAIT_DEBOUNCE:
af450ebb
BJS		 3596 if (tcpm_port_is_sink(port))
3597 tcpm_set_state(port, SNK_TRYWAIT_VBUS, 0);
3598 break;
3599 case SNK_TRYWAIT_VBUS:
3600 if (!tcpm_port_is_sink(port))
f0690a25
GR		 3601 tcpm_set_state(port, SNK_TRYWAIT_DEBOUNCE, 0);
3602 break;
af450ebb
BJS		 3603 case SNK_TRYWAIT:
3604 /* Do nothing, waiting for tCCDebounce */
3605 break;
f0690a25
GR		 3606 case PR_SWAP_SNK_SRC_SINK_OFF:
3607 case PR_SWAP_SRC_SNK_TRANSITION_OFF:
3608 case PR_SWAP_SRC_SNK_SOURCE_OFF:
b965b631
BJS		 3609 case PR_SWAP_SRC_SNK_SOURCE_OFF_CC_DEBOUNCED:
3610 case PR_SWAP_SNK_SRC_SOURCE_ON:
f0690a25 3611 /*
b965b631 3612 * CC state change is expected in PR_SWAP
f0690a25
GR		 3613 * Ignore it.
3614 */
3615 break;
3616
3617 default:
3618 if (tcpm_port_is_disconnected(port))
3619 tcpm_set_state(port, unattached_state(port), 0);
3620 break;
3621 }
3622}
3623
3624static void _tcpm_pd_vbus_on(struct tcpm_port *port)
3625{
f0690a25
GR		 3626 tcpm_log_force(port, "VBUS on");
3627 port->vbus_present = true;
3628 switch (port->state) {
3629 case SNK_TRANSITION_SINK_VBUS:
8bf05746 3630 port->explicit_contract = true;
f0690a25
GR		 3631 tcpm_set_state(port, SNK_READY, 0);
3632 break;
3633 case SNK_DISCOVERY:
3634 tcpm_set_state(port, SNK_DISCOVERY, 0);
3635 break;
3636
3637 case SNK_DEBOUNCED:
3638 tcpm_set_state(port, tcpm_try_src(port) ? SRC_TRY
3639 : SNK_ATTACHED,
3640 0);
3641 break;
3642 case SNK_HARD_RESET_WAIT_VBUS:
3643 tcpm_set_state(port, SNK_HARD_RESET_SINK_ON, 0);
3644 break;
3645 case SRC_ATTACHED:
3646 tcpm_set_state(port, SRC_STARTUP, 0);
3647 break;
3648 case SRC_HARD_RESET_VBUS_ON:
3649 tcpm_set_state(port, SRC_STARTUP, 0);
3650 break;
3651
3652 case SNK_TRY:
3653 /* Do nothing, waiting for timeout */
3654 break;
3655 case SRC_TRYWAIT:
02d5be46
BJS		 3656 /* Do nothing, Waiting for Rd to be detected */
3657 break;
3658 case SRC_TRYWAIT_DEBOUNCE:
3659 tcpm_set_state(port, SRC_TRYWAIT, 0);
f0690a25 3660 break;
a0a3e04e
BJS		 3661 case SNK_TRY_WAIT_DEBOUNCE:
3662 /* Do nothing, waiting for PD_DEBOUNCE to do be done */
f0690a25
GR		 3663 break;
3664 case SNK_TRYWAIT:
af450ebb
BJS		 3665 /* Do nothing, waiting for tCCDebounce */
3666 break;
3667 case SNK_TRYWAIT_VBUS:
3668 if (tcpm_port_is_sink(port))
3669 tcpm_set_state(port, SNK_ATTACHED, 0);
3670 break;
3671 case SNK_TRYWAIT_DEBOUNCE:
3672 /* Do nothing, waiting for Rp */
f0690a25 3673 break;
131c7d12
BJS		 3674 case SRC_TRY_WAIT:
3675 case SRC_TRY_DEBOUNCE:
3676 /* Do nothing, waiting for sink detection */
3677 break;
f0690a25
GR		 3678 default:
3679 break;
3680 }
3681}
3682
3683static void _tcpm_pd_vbus_off(struct tcpm_port *port)
3684{
f0690a25
GR		 3685 tcpm_log_force(port, "VBUS off");
3686 port->vbus_present = false;
3687 port->vbus_never_low = false;
3688 switch (port->state) {
3689 case SNK_HARD_RESET_SINK_OFF:
3690 tcpm_set_state(port, SNK_HARD_RESET_WAIT_VBUS, 0);
3691 break;
3692 case SRC_HARD_RESET_VBUS_OFF:
3693 tcpm_set_state(port, SRC_HARD_RESET_VBUS_ON, 0);
3694 break;
3695 case HARD_RESET_SEND:
3696 break;
3697
3698 case SNK_TRY:
3699 /* Do nothing, waiting for timeout */
3700 break;
3701 case SRC_TRYWAIT:
3702 /* Hand over to state machine if needed */
3703 if (tcpm_port_is_source(port))
02d5be46 3704 tcpm_set_state(port, SRC_TRYWAIT_DEBOUNCE, 0);
f0690a25 3705 break;
a0a3e04e
BJS		 3706 case SNK_TRY_WAIT_DEBOUNCE:
3707 /* Do nothing, waiting for PD_DEBOUNCE to do be done */
f0690a25 3708 break;
af450ebb 3709 case SNK_TRYWAIT:
f0690a25 3710 case SNK_TRYWAIT_VBUS:
af450ebb 3711 case SNK_TRYWAIT_DEBOUNCE:
f0690a25 3712 break;
f0690a25
GR		 3713 case SNK_ATTACH_WAIT:
3714 tcpm_set_state(port, SNK_UNATTACHED, 0);
3715 break;
3716
3717 case SNK_NEGOTIATE_CAPABILITIES:
3718 break;
3719
3720 case PR_SWAP_SRC_SNK_TRANSITION_OFF:
3721 tcpm_set_state(port, PR_SWAP_SRC_SNK_SOURCE_OFF, 0);
3722 break;
3723
3724 case PR_SWAP_SNK_SRC_SINK_OFF:
3725 /* Do nothing, expected */
3726 break;
3727
b17dd571 3728 case PORT_RESET_WAIT_OFF:
c749d4d0 3729 tcpm_set_state(port, tcpm_default_state(port), 0);
f0690a25 3730 break;
131c7d12
BJS		 3731 case SRC_TRY_WAIT:
3732 case SRC_TRY_DEBOUNCE:
3733 /* Do nothing, waiting for sink detection */
3734 break;
f0690a25
GR		 3735 default:
3736 if (port->pwr_role == TYPEC_SINK &&
3737 port->attached)
3738 tcpm_set_state(port, SNK_UNATTACHED, 0);
3739 break;
3740 }
3741}
3742
3743static void _tcpm_pd_hard_reset(struct tcpm_port *port)
3744{
3745 tcpm_log_force(port, "Received hard reset");
3746 /*
3747 * If we keep receiving hard reset requests, executing the hard reset
3748 * must have failed. Revert to error recovery if that happens.
3749 */
3750 tcpm_set_state(port,
3751 port->hard_reset_count < PD_N_HARD_RESET_COUNT ?
3752 HARD_RESET_START : ERROR_RECOVERY,
3753 0);
3754}
3755
3756static void tcpm_pd_event_handler(struct work_struct *work)
3757{
3758 struct tcpm_port *port = container_of(work, struct tcpm_port,
3759 event_work);
3760 u32 events;
3761
3762 mutex_lock(&port->lock);
3763
3764 spin_lock(&port->pd_event_lock);
3765 while (port->pd_events) {
3766 events = port->pd_events;
3767 port->pd_events = 0;
3768 spin_unlock(&port->pd_event_lock);
3769 if (events & TCPM_RESET_EVENT)
3770 _tcpm_pd_hard_reset(port);
3771 if (events & TCPM_VBUS_EVENT) {
3772 bool vbus;
3773
3774 vbus = port->tcpc->get_vbus(port->tcpc);
3775 if (vbus)
3776 _tcpm_pd_vbus_on(port);
3777 else
3778 _tcpm_pd_vbus_off(port);
3779 }
3780 if (events & TCPM_CC_EVENT) {
3781 enum typec_cc_status cc1, cc2;
3782
3783 if (port->tcpc->get_cc(port->tcpc, &cc1, &cc2) == 0)
3784 _tcpm_cc_change(port, cc1, cc2);
3785 }
3786 spin_lock(&port->pd_event_lock);
3787 }
3788 spin_unlock(&port->pd_event_lock);
3789 mutex_unlock(&port->lock);
3790}
3791
3792void tcpm_cc_change(struct tcpm_port *port)
3793{
3794 spin_lock(&port->pd_event_lock);
3795 port->pd_events |= TCPM_CC_EVENT;
3796 spin_unlock(&port->pd_event_lock);
3797 queue_work(port->wq, &port->event_work);
3798}
3799EXPORT_SYMBOL_GPL(tcpm_cc_change);
3800
3801void tcpm_vbus_change(struct tcpm_port *port)
3802{
3803 spin_lock(&port->pd_event_lock);
3804 port->pd_events |= TCPM_VBUS_EVENT;
3805 spin_unlock(&port->pd_event_lock);
3806 queue_work(port->wq, &port->event_work);
3807}
3808EXPORT_SYMBOL_GPL(tcpm_vbus_change);
3809
3810void tcpm_pd_hard_reset(struct tcpm_port *port)
3811{
3812 spin_lock(&port->pd_event_lock);
3813 port->pd_events = TCPM_RESET_EVENT;
3814 spin_unlock(&port->pd_event_lock);
3815 queue_work(port->wq, &port->event_work);
3816}
3817EXPORT_SYMBOL_GPL(tcpm_pd_hard_reset);
3818
3819static int tcpm_dr_set(const struct typec_capability *cap,
3820 enum typec_data_role data)
3821{
3822 struct tcpm_port *port = typec_cap_to_tcpm(cap);
3823 int ret;
3824
3825 mutex_lock(&port->swap_lock);
3826 mutex_lock(&port->lock);
3827
9b0ae699 3828 if (port->port_type != TYPEC_PORT_DRP) {
f0690a25
GR		 3829 ret = -EINVAL;
3830 goto port_unlock;
3831 }
3832 if (port->state != SRC_READY && port->state != SNK_READY) {
3833 ret = -EAGAIN;
3834 goto port_unlock;
3835 }
3836
3837 if (port->data_role == data) {
3838 ret = 0;
3839 goto port_unlock;
3840 }
3841
3842 /*
3843 * XXX
3844 * 6.3.9: If an alternate mode is active, a request to swap
3845 * alternate modes shall trigger a port reset.
3846 * Reject data role swap request in this case.
3847 */
3848
b17dd571
GR		 3849 if (!port->pd_capable) {
3850 /*
3851 * If the partner is not PD capable, reset the port to
3852 * trigger a role change. This can only work if a preferred
3853 * role is configured, and if it matches the requested role.
3854 */
3855 if (port->try_role == TYPEC_NO_PREFERRED_ROLE ||
3856 port->try_role == port->pwr_role) {
3857 ret = -EINVAL;
3858 goto port_unlock;
3859 }
3860 port->non_pd_role_swap = true;
3861 tcpm_set_state(port, PORT_RESET, 0);
3862 } else {
3863 tcpm_set_state(port, DR_SWAP_SEND, 0);
3864 }
3865
f0690a25
GR		 3866 port->swap_status = 0;
3867 port->swap_pending = true;
3868 reinit_completion(&port->swap_complete);
f0690a25
GR		 3869 mutex_unlock(&port->lock);
3870
9adf9f9e
GR		 3871 if (!wait_for_completion_timeout(&port->swap_complete,
3872 msecs_to_jiffies(PD_ROLE_SWAP_TIMEOUT)))
3873 ret = -ETIMEDOUT;
3874 else
3875 ret = port->swap_status;
f0690a25 3876
b17dd571 3877 port->non_pd_role_swap = false;
f0690a25
GR		 3878 goto swap_unlock;
3879
3880port_unlock:
3881 mutex_unlock(&port->lock);
3882swap_unlock:
3883 mutex_unlock(&port->swap_lock);
3884 return ret;
3885}
3886
3887static int tcpm_pr_set(const struct typec_capability *cap,
3888 enum typec_role role)
3889{
3890 struct tcpm_port *port = typec_cap_to_tcpm(cap);
3891 int ret;
3892
3893 mutex_lock(&port->swap_lock);
3894 mutex_lock(&port->lock);
3895
9b0ae699 3896 if (port->port_type != TYPEC_PORT_DRP) {
f0690a25
GR		 3897 ret = -EINVAL;
3898 goto port_unlock;
3899 }
3900 if (port->state != SRC_READY && port->state != SNK_READY) {
3901 ret = -EAGAIN;
3902 goto port_unlock;
3903 }
3904
3905 if (role == port->pwr_role) {
3906 ret = 0;
3907 goto port_unlock;
3908 }
3909
f0690a25
GR		 3910 port->swap_status = 0;
3911 port->swap_pending = true;
3912 reinit_completion(&port->swap_complete);
3913 tcpm_set_state(port, PR_SWAP_SEND, 0);
3914 mutex_unlock(&port->lock);
3915
9adf9f9e
GR		 3916 if (!wait_for_completion_timeout(&port->swap_complete,
3917 msecs_to_jiffies(PD_ROLE_SWAP_TIMEOUT)))
3918 ret = -ETIMEDOUT;
3919 else
3920 ret = port->swap_status;
f0690a25 3921
f0690a25
GR		 3922 goto swap_unlock;
3923
3924port_unlock:
3925 mutex_unlock(&port->lock);
3926swap_unlock:
3927 mutex_unlock(&port->swap_lock);
3928 return ret;
3929}
3930
3931static int tcpm_vconn_set(const struct typec_capability *cap,
3932 enum typec_role role)
3933{
3934 struct tcpm_port *port = typec_cap_to_tcpm(cap);
3935 int ret;
3936
3937 mutex_lock(&port->swap_lock);
3938 mutex_lock(&port->lock);
3939
3940 if (port->state != SRC_READY && port->state != SNK_READY) {
3941 ret = -EAGAIN;
3942 goto port_unlock;
3943 }
3944
3945 if (role == port->vconn_role) {
3946 ret = 0;
3947 goto port_unlock;
3948 }
3949
3950 port->swap_status = 0;
3951 port->swap_pending = true;
3952 reinit_completion(&port->swap_complete);
3953 tcpm_set_state(port, VCONN_SWAP_SEND, 0);
3954 mutex_unlock(&port->lock);
3955
9adf9f9e
GR		 3956 if (!wait_for_completion_timeout(&port->swap_complete,
3957 msecs_to_jiffies(PD_ROLE_SWAP_TIMEOUT)))
3958 ret = -ETIMEDOUT;
3959 else
3960 ret = port->swap_status;
f0690a25 3961
f0690a25
GR		 3962 goto swap_unlock;
3963
3964port_unlock:
3965 mutex_unlock(&port->lock);
3966swap_unlock:
3967 mutex_unlock(&port->swap_lock);
3968 return ret;
3969}
3970
3971static int tcpm_try_role(const struct typec_capability *cap, int role)
3972{
3973 struct tcpm_port *port = typec_cap_to_tcpm(cap);
3974 struct tcpc_dev *tcpc = port->tcpc;
3975 int ret = 0;
3976
3977 mutex_lock(&port->lock);
3978 if (tcpc->try_role)
3979 ret = tcpc->try_role(tcpc, role);
3980 if (!ret && !tcpc->config->try_role_hw)
3981 port->try_role = role;
3982 port->try_src_count = 0;
3983 port->try_snk_count = 0;
3984 mutex_unlock(&port->lock);
3985
3986 return ret;
3987}
3988
f2a8aa05 3989static int tcpm_pps_set_op_curr(struct tcpm_port *port, u16 op_curr)
2eadc33f
AT		 3990{
3991 unsigned int target_mw;
3992 int ret;
3993
3994 mutex_lock(&port->swap_lock);
3995 mutex_lock(&port->lock);
3996
3997 if (!port->pps_data.active) {
3998 ret = -EOPNOTSUPP;
3999 goto port_unlock;
4000 }
4001
4002 if (port->state != SNK_READY) {
4003 ret = -EAGAIN;
4004 goto port_unlock;
4005 }
4006
4007 if (op_curr > port->pps_data.max_curr) {
4008 ret = -EINVAL;
4009 goto port_unlock;
4010 }
4011
4012 target_mw = (op_curr * port->pps_data.out_volt) / 1000;
4013 if (target_mw < port->operating_snk_mw) {
4014 ret = -EINVAL;
4015 goto port_unlock;
4016 }
4017
4018 reinit_completion(&port->pps_complete);
4019 port->pps_data.op_curr = op_curr;
4020 port->pps_status = 0;
4021 port->pps_pending = true;
4022 tcpm_set_state(port, SNK_NEGOTIATE_PPS_CAPABILITIES, 0);
4023 mutex_unlock(&port->lock);
4024
4025 if (!wait_for_completion_timeout(&port->pps_complete,
4026 msecs_to_jiffies(PD_PPS_CTRL_TIMEOUT)))
4027 ret = -ETIMEDOUT;
4028 else
4029 ret = port->pps_status;
4030
4031 goto swap_unlock;
4032
4033port_unlock:
4034 mutex_unlock(&port->lock);
4035swap_unlock:
4036 mutex_unlock(&port->swap_lock);
4037
4038 return ret;
4039}
4040
f2a8aa05 4041static int tcpm_pps_set_out_volt(struct tcpm_port *port, u16 out_volt)
2eadc33f
AT		 4042{
4043 unsigned int target_mw;
4044 int ret;
4045
4046 mutex_lock(&port->swap_lock);
4047 mutex_lock(&port->lock);
4048
4049 if (!port->pps_data.active) {
4050 ret = -EOPNOTSUPP;
4051 goto port_unlock;
4052 }
4053
4054 if (port->state != SNK_READY) {
4055 ret = -EAGAIN;
4056 goto port_unlock;
4057 }
4058
4059 if (out_volt < port->pps_data.min_volt ||
4060 out_volt > port->pps_data.max_volt) {
4061 ret = -EINVAL;
4062 goto port_unlock;
4063 }
4064
4065 target_mw = (port->pps_data.op_curr * out_volt) / 1000;
4066 if (target_mw < port->operating_snk_mw) {
4067 ret = -EINVAL;
4068 goto port_unlock;
4069 }
4070
4071 reinit_completion(&port->pps_complete);
4072 port->pps_data.out_volt = out_volt;
4073 port->pps_status = 0;
4074 port->pps_pending = true;
4075 tcpm_set_state(port, SNK_NEGOTIATE_PPS_CAPABILITIES, 0);
4076 mutex_unlock(&port->lock);
4077
4078 if (!wait_for_completion_timeout(&port->pps_complete,
4079 msecs_to_jiffies(PD_PPS_CTRL_TIMEOUT)))
4080 ret = -ETIMEDOUT;
4081 else
4082 ret = port->pps_status;
4083
4084 goto swap_unlock;
4085
4086port_unlock:
4087 mutex_unlock(&port->lock);
4088swap_unlock:
4089 mutex_unlock(&port->swap_lock);
4090
4091 return ret;
4092}
4093
f2a8aa05 4094static int tcpm_pps_activate(struct tcpm_port *port, bool activate)
2eadc33f
AT		 4095{
4096 int ret = 0;
4097
4098 mutex_lock(&port->swap_lock);
4099 mutex_lock(&port->lock);
4100
4101 if (!port->pps_data.supported) {
4102 ret = -EOPNOTSUPP;
4103 goto port_unlock;
4104 }
4105
4106 /* Trying to deactivate PPS when already deactivated so just bail */
4107 if (!port->pps_data.active && !activate)
4108 goto port_unlock;
4109
4110 if (port->state != SNK_READY) {
4111 ret = -EAGAIN;
4112 goto port_unlock;
4113 }
4114
4115 reinit_completion(&port->pps_complete);
4116 port->pps_status = 0;
4117 port->pps_pending = true;
4118
4119 /* Trigger PPS request or move back to standard PDO contract */
4120 if (activate) {
4121 port->pps_data.out_volt = port->supply_voltage;
4122 port->pps_data.op_curr = port->current_limit;
4123 tcpm_set_state(port, SNK_NEGOTIATE_PPS_CAPABILITIES, 0);
4124 } else {
4125 tcpm_set_state(port, SNK_NEGOTIATE_CAPABILITIES, 0);
4126 }
4127 mutex_unlock(&port->lock);
4128
4129 if (!wait_for_completion_timeout(&port->pps_complete,
4130 msecs_to_jiffies(PD_PPS_CTRL_TIMEOUT)))
4131 ret = -ETIMEDOUT;
4132 else
4133 ret = port->pps_status;
4134
4135 goto swap_unlock;
4136
4137port_unlock:
4138 mutex_unlock(&port->lock);
4139swap_unlock:
4140 mutex_unlock(&port->swap_lock);
4141
4142 return ret;
4143}
4144
f0690a25
GR		 4145static void tcpm_init(struct tcpm_port *port)
4146{
4147 enum typec_cc_status cc1, cc2;
4148
4149 port->tcpc->init(port->tcpc);
4150
4151 tcpm_reset_port(port);
4152
4153 /*
4154 * XXX
4155 * Should possibly wait for VBUS to settle if it was enabled locally
4156 * since tcpm_reset_port() will disable VBUS.
4157 */
4158 port->vbus_present = port->tcpc->get_vbus(port->tcpc);
4159 if (port->vbus_present)
4160 port->vbus_never_low = true;
4161
4162 tcpm_set_state(port, tcpm_default_state(port), 0);
4163
4164 if (port->tcpc->get_cc(port->tcpc, &cc1, &cc2) == 0)
4165 _tcpm_cc_change(port, cc1, cc2);
4166
4167 /*
4168 * Some adapters need a clean slate at startup, and won't recover
4169 * otherwise. So do not try to be fancy and force a clean disconnect.
4170 */
b17dd571 4171 tcpm_set_state(port, PORT_RESET, 0);
f0690a25
GR		 4172}
4173
9b0ae699
BJS		 4174static int tcpm_port_type_set(const struct typec_capability *cap,
4175 enum typec_port_type type)
4176{
4177 struct tcpm_port *port = typec_cap_to_tcpm(cap);
4178
4179 mutex_lock(&port->lock);
4180 if (type == port->port_type)
4181 goto port_unlock;
4182
4183 port->port_type = type;
4184
4185 if (!port->connected) {
4186 tcpm_set_state(port, PORT_RESET, 0);
ceeb1625 4187 } else if (type == TYPEC_PORT_SNK) {
9b0ae699
BJS		 4188 if (!(port->pwr_role == TYPEC_SINK &&
4189 port->data_role == TYPEC_DEVICE))
4190 tcpm_set_state(port, PORT_RESET, 0);
ceeb1625 4191 } else if (type == TYPEC_PORT_SRC) {
9b0ae699
BJS		 4192 if (!(port->pwr_role == TYPEC_SOURCE &&
4193 port->data_role == TYPEC_HOST))
4194 tcpm_set_state(port, PORT_RESET, 0);
4195 }
4196
4197port_unlock:
4198 mutex_unlock(&port->lock);
4199 return 0;
4200}
4201
f0690a25
GR		 4202void tcpm_tcpc_reset(struct tcpm_port *port)
4203{
4204 mutex_lock(&port->lock);
4205 /* XXX: Maintain PD connection if possible? */
4206 tcpm_init(port);
4207 mutex_unlock(&port->lock);
4208}
4209EXPORT_SYMBOL_GPL(tcpm_tcpc_reset);
4210
4211static int tcpm_copy_pdos(u32 *dest_pdo, const u32 *src_pdo,
4212 unsigned int nr_pdo)
4213{
4214 unsigned int i;
4215
4216 if (nr_pdo > PDO_MAX_OBJECTS)
4217 nr_pdo = PDO_MAX_OBJECTS;
4218
4219 for (i = 0; i < nr_pdo; i++)
4220 dest_pdo[i] = src_pdo[i];
4221
4222 return nr_pdo;
4223}
4224
193a6801
GR		 4225static int tcpm_copy_vdos(u32 *dest_vdo, const u32 *src_vdo,
4226 unsigned int nr_vdo)
4227{
4228 unsigned int i;
4229
4230 if (nr_vdo > VDO_MAX_OBJECTS)
4231 nr_vdo = VDO_MAX_OBJECTS;
4232
4233 for (i = 0; i < nr_vdo; i++)
4234 dest_vdo[i] = src_vdo[i];
4235
4236 return nr_vdo;
4237}
4238
96232cbc
LJ		 4239static int tcpm_fw_get_caps(struct tcpm_port *port,
4240 struct fwnode_handle *fwnode)
4241{
4242 const char *cap_str;
4243 int ret;
4244 u32 mw;
4245
4246 if (!fwnode)
4247 return -EINVAL;
4248
4249 /* USB data support is optional */
4250 ret = fwnode_property_read_string(fwnode, "data-role", &cap_str);
4251 if (ret == 0) {
4252 port->typec_caps.data = typec_find_port_data_role(cap_str);
4253 if (port->typec_caps.data < 0)
4254 return -EINVAL;
4255 }
4256
4257 ret = fwnode_property_read_string(fwnode, "power-role", &cap_str);
4258 if (ret < 0)
4259 return ret;
4260
4261 port->typec_caps.type = typec_find_port_power_role(cap_str);
4262 if (port->typec_caps.type < 0)
4263 return -EINVAL;
4264 port->port_type = port->typec_caps.type;
4265
4266 if (port->port_type == TYPEC_PORT_SNK)
4267 goto sink;
4268
4269 /* Get source pdos */
4270 ret = fwnode_property_read_u32_array(fwnode, "source-pdos",
4271 NULL, 0);
4272 if (ret <= 0)
4273 return -EINVAL;
4274
4275 port->nr_src_pdo = min(ret, PDO_MAX_OBJECTS);
4276 ret = fwnode_property_read_u32_array(fwnode, "source-pdos",
4277 port->src_pdo, port->nr_src_pdo);
4278 if ((ret < 0) || tcpm_validate_caps(port, port->src_pdo,
4279 port->nr_src_pdo))
4280 return -EINVAL;
4281
4282 if (port->port_type == TYPEC_PORT_SRC)
4283 return 0;
4284
4285 /* Get the preferred power role for DRP */
4286 ret = fwnode_property_read_string(fwnode, "try-power-role", &cap_str);
4287 if (ret < 0)
4288 return ret;
4289
4290 port->typec_caps.prefer_role = typec_find_power_role(cap_str);
4291 if (port->typec_caps.prefer_role < 0)
4292 return -EINVAL;
4293sink:
4294 /* Get sink pdos */
4295 ret = fwnode_property_read_u32_array(fwnode, "sink-pdos",
4296 NULL, 0);
4297 if (ret <= 0)
4298 return -EINVAL;
4299
4300 port->nr_snk_pdo = min(ret, PDO_MAX_OBJECTS);
4301 ret = fwnode_property_read_u32_array(fwnode, "sink-pdos",
4302 port->snk_pdo, port->nr_snk_pdo);
4303 if ((ret < 0) || tcpm_validate_caps(port, port->snk_pdo,
4304 port->nr_snk_pdo))
4305 return -EINVAL;
4306
4307 if (fwnode_property_read_u32(fwnode, "op-sink-microwatt", &mw) < 0)
4308 return -EINVAL;
4309 port->operating_snk_mw = mw / 1000;
4310
4311 return 0;
4312}
4313
5007e1b5
BJS		 4314int tcpm_update_source_capabilities(struct tcpm_port *port, const u32 *pdo,
4315 unsigned int nr_pdo)
f0690a25 4316{
5007e1b5
BJS		 4317 if (tcpm_validate_caps(port, pdo, nr_pdo))
4318 return -EINVAL;
4319
f0690a25
GR		 4320 mutex_lock(&port->lock);
4321 port->nr_src_pdo = tcpm_copy_pdos(port->src_pdo, pdo, nr_pdo);
4322 switch (port->state) {
4323 case SRC_UNATTACHED:
4324 case SRC_ATTACH_WAIT:
4325 case SRC_TRYWAIT:
4326 tcpm_set_cc(port, tcpm_rp_cc(port));
4327 break;
4328 case SRC_SEND_CAPABILITIES:
4329 case SRC_NEGOTIATE_CAPABILITIES:
4330 case SRC_READY:
4331 case SRC_WAIT_NEW_CAPABILITIES:
4332 tcpm_set_cc(port, tcpm_rp_cc(port));
4333 tcpm_set_state(port, SRC_SEND_CAPABILITIES, 0);
4334 break;
4335 default:
4336 break;
4337 }
4338 mutex_unlock(&port->lock);
5007e1b5 4339 return 0;
f0690a25
GR		 4340}
4341EXPORT_SYMBOL_GPL(tcpm_update_source_capabilities);
4342
5007e1b5
BJS		 4343int tcpm_update_sink_capabilities(struct tcpm_port *port, const u32 *pdo,
4344 unsigned int nr_pdo,
5007e1b5 4345 unsigned int operating_snk_mw)
f0690a25 4346{
5007e1b5
BJS		 4347 if (tcpm_validate_caps(port, pdo, nr_pdo))
4348 return -EINVAL;
4349
f0690a25
GR		 4350 mutex_lock(&port->lock);
4351 port->nr_snk_pdo = tcpm_copy_pdos(port->snk_pdo, pdo, nr_pdo);
f0690a25 4352 port->operating_snk_mw = operating_snk_mw;
2eadc33f 4353 port->update_sink_caps = true;
f0690a25
GR		 4354
4355 switch (port->state) {
4356 case SNK_NEGOTIATE_CAPABILITIES:
2eadc33f 4357 case SNK_NEGOTIATE_PPS_CAPABILITIES:
f0690a25
GR		 4358 case SNK_READY:
4359 case SNK_TRANSITION_SINK:
4360 case SNK_TRANSITION_SINK_VBUS:
2eadc33f
AT		 4361 if (port->pps_data.active)
4362 tcpm_set_state(port, SNK_NEGOTIATE_PPS_CAPABILITIES, 0);
4363 else
4364 tcpm_set_state(port, SNK_NEGOTIATE_CAPABILITIES, 0);
f0690a25
GR		 4365 break;
4366 default:
4367 break;
4368 }
4369 mutex_unlock(&port->lock);
5007e1b5 4370 return 0;
f0690a25
GR		 4371}
4372EXPORT_SYMBOL_GPL(tcpm_update_sink_capabilities);
4373
f2a8aa05
AT		 4374/* Power Supply access to expose source power information */
4375enum tcpm_psy_online_states {
4376 TCPM_PSY_OFFLINE = 0,
4377 TCPM_PSY_FIXED_ONLINE,
4378 TCPM_PSY_PROG_ONLINE,
4379};
4380
4381static enum power_supply_property tcpm_psy_props[] = {
4382 POWER_SUPPLY_PROP_USB_TYPE,
4383 POWER_SUPPLY_PROP_ONLINE,
4384 POWER_SUPPLY_PROP_VOLTAGE_MIN,
4385 POWER_SUPPLY_PROP_VOLTAGE_MAX,
4386 POWER_SUPPLY_PROP_VOLTAGE_NOW,
4387 POWER_SUPPLY_PROP_CURRENT_MAX,
4388 POWER_SUPPLY_PROP_CURRENT_NOW,
4389};
4390
4391static int tcpm_psy_get_online(struct tcpm_port *port,
4392 union power_supply_propval *val)
4393{
4394 if (port->vbus_charge) {
4395 if (port->pps_data.active)
4396 val->intval = TCPM_PSY_PROG_ONLINE;
4397 else
4398 val->intval = TCPM_PSY_FIXED_ONLINE;
4399 } else {
4400 val->intval = TCPM_PSY_OFFLINE;
4401 }
4402
4403 return 0;
4404}
4405
4406static int tcpm_psy_get_voltage_min(struct tcpm_port *port,
4407 union power_supply_propval *val)
4408{
4409 if (port->pps_data.active)
4410 val->intval = port->pps_data.min_volt * 1000;
4411 else
4412 val->intval = port->supply_voltage * 1000;
4413
4414 return 0;
4415}
4416
4417static int tcpm_psy_get_voltage_max(struct tcpm_port *port,
4418 union power_supply_propval *val)
4419{
4420 if (port->pps_data.active)
4421 val->intval = port->pps_data.max_volt * 1000;
4422 else
4423 val->intval = port->supply_voltage * 1000;
4424
4425 return 0;
4426}
4427
4428static int tcpm_psy_get_voltage_now(struct tcpm_port *port,
4429 union power_supply_propval *val)
4430{
4431 val->intval = port->supply_voltage * 1000;
4432
4433 return 0;
4434}
4435
4436static int tcpm_psy_get_current_max(struct tcpm_port *port,
4437 union power_supply_propval *val)
4438{
4439 if (port->pps_data.active)
4440 val->intval = port->pps_data.max_curr * 1000;
4441 else
4442 val->intval = port->current_limit * 1000;
4443
4444 return 0;
4445}
4446
4447static int tcpm_psy_get_current_now(struct tcpm_port *port,
4448 union power_supply_propval *val)
4449{
4450 val->intval = port->current_limit * 1000;
4451
4452 return 0;
4453}
4454
4455static int tcpm_psy_get_prop(struct power_supply *psy,
4456 enum power_supply_property psp,
4457 union power_supply_propval *val)
4458{
4459 struct tcpm_port *port = power_supply_get_drvdata(psy);
4460 int ret = 0;
4461
4462 switch (psp) {
4463 case POWER_SUPPLY_PROP_USB_TYPE:
4464 val->intval = port->usb_type;
4465 break;
4466 case POWER_SUPPLY_PROP_ONLINE:
4467 ret = tcpm_psy_get_online(port, val);
4468 break;
4469 case POWER_SUPPLY_PROP_VOLTAGE_MIN:
4470 ret = tcpm_psy_get_voltage_min(port, val);
4471 break;
4472 case POWER_SUPPLY_PROP_VOLTAGE_MAX:
4473 ret = tcpm_psy_get_voltage_max(port, val);
4474 break;
4475 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
4476 ret = tcpm_psy_get_voltage_now(port, val);
4477 break;
4478 case POWER_SUPPLY_PROP_CURRENT_MAX:
4479 ret = tcpm_psy_get_current_max(port, val);
4480 break;
4481 case POWER_SUPPLY_PROP_CURRENT_NOW:
4482 ret = tcpm_psy_get_current_now(port, val);
4483 break;
4484 default:
4485 ret = -EINVAL;
4486 break;
4487 }
4488
4489 return ret;
4490}
4491
4492static int tcpm_psy_set_online(struct tcpm_port *port,
4493 const union power_supply_propval *val)
4494{
4495 int ret;
4496
4497 switch (val->intval) {
4498 case TCPM_PSY_FIXED_ONLINE:
4499 ret = tcpm_pps_activate(port, false);
4500 break;
4501 case TCPM_PSY_PROG_ONLINE:
4502 ret = tcpm_pps_activate(port, true);
4503 break;
4504 default:
4505 ret = -EINVAL;
4506 break;
4507 }
4508
4509 return ret;
4510}
4511
4512static int tcpm_psy_set_prop(struct power_supply *psy,
4513 enum power_supply_property psp,
4514 const union power_supply_propval *val)
4515{
4516 struct tcpm_port *port = power_supply_get_drvdata(psy);
4517 int ret;
4518
4519 switch (psp) {
4520 case POWER_SUPPLY_PROP_ONLINE:
4521 ret = tcpm_psy_set_online(port, val);
4522 break;
4523 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
4524 if (val->intval < port->pps_data.min_volt * 1000 ||
4525 val->intval > port->pps_data.max_volt * 1000)
4526 ret = -EINVAL;
4527 else
4528 ret = tcpm_pps_set_out_volt(port, val->intval / 1000);
4529 break;
4530 case POWER_SUPPLY_PROP_CURRENT_NOW:
4531 if (val->intval > port->pps_data.max_curr * 1000)
4532 ret = -EINVAL;
4533 else
4534 ret = tcpm_pps_set_op_curr(port, val->intval / 1000);
4535 break;
4536 default:
4537 ret = -EINVAL;
4538 break;
4539 }
4540
4541 return ret;
4542}
4543
4544static int tcpm_psy_prop_writeable(struct power_supply *psy,
4545 enum power_supply_property psp)
4546{
4547 switch (psp) {
4548 case POWER_SUPPLY_PROP_ONLINE:
4549 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
4550 case POWER_SUPPLY_PROP_CURRENT_NOW:
4551 return 1;
4552 default:
4553 return 0;
4554 }
4555}
4556
4557static enum power_supply_usb_type tcpm_psy_usb_types[] = {
4558 POWER_SUPPLY_USB_TYPE_C,
4559 POWER_SUPPLY_USB_TYPE_PD,
4560 POWER_SUPPLY_USB_TYPE_PD_PPS,
4561};
4562
4563static const char *tcpm_psy_name_prefix = "tcpm-source-psy-";
4564
4565static int devm_tcpm_psy_register(struct tcpm_port *port)
4566{
4567 struct power_supply_config psy_cfg = {};
4568 const char *port_dev_name = dev_name(port->dev);
4569 size_t psy_name_len = strlen(tcpm_psy_name_prefix) +
4570 strlen(port_dev_name) + 1;
4571 char *psy_name;
4572
4573 psy_cfg.drv_data = port;
c97a8cc1 4574 psy_cfg.fwnode = dev_fwnode(port->dev);
f2a8aa05
AT		 4575 psy_name = devm_kzalloc(port->dev, psy_name_len, GFP_KERNEL);
4576 if (!psy_name)
4577 return -ENOMEM;
4578
4579 snprintf(psy_name, psy_name_len, "%s%s", tcpm_psy_name_prefix,
4580 port_dev_name);
4581 port->psy_desc.name = psy_name;
4582 port->psy_desc.type = POWER_SUPPLY_TYPE_USB,
4583 port->psy_desc.usb_types = tcpm_psy_usb_types;
4584 port->psy_desc.num_usb_types = ARRAY_SIZE(tcpm_psy_usb_types);
4585 port->psy_desc.properties = tcpm_psy_props,
4586 port->psy_desc.num_properties = ARRAY_SIZE(tcpm_psy_props),
4587 port->psy_desc.get_property = tcpm_psy_get_prop,
4588 port->psy_desc.set_property = tcpm_psy_set_prop,
4589 port->psy_desc.property_is_writeable = tcpm_psy_prop_writeable,
4590
4591 port->usb_type = POWER_SUPPLY_USB_TYPE_C;
4592
4593 port->psy = devm_power_supply_register(port->dev, &port->psy_desc,
4594 &psy_cfg);
4595
4596 return PTR_ERR_OR_ZERO(port->psy);
4597}
4598
96232cbc
LJ		 4599static int tcpm_copy_caps(struct tcpm_port *port,
4600 const struct tcpc_config *tcfg)
4601{
4602 if (tcpm_validate_caps(port, tcfg->src_pdo, tcfg->nr_src_pdo) ||
4603 tcpm_validate_caps(port, tcfg->snk_pdo, tcfg->nr_snk_pdo))
4604 return -EINVAL;
4605
4606 port->nr_src_pdo = tcpm_copy_pdos(port->src_pdo, tcfg->src_pdo,
4607 tcfg->nr_src_pdo);
4608 port->nr_snk_pdo = tcpm_copy_pdos(port->snk_pdo, tcfg->snk_pdo,
4609 tcfg->nr_snk_pdo);
4610
4611 port->nr_snk_vdo = tcpm_copy_vdos(port->snk_vdo, tcfg->snk_vdo,
4612 tcfg->nr_snk_vdo);
4613
4614 port->operating_snk_mw = tcfg->operating_snk_mw;
4615
4616 port->typec_caps.prefer_role = tcfg->default_role;
4617 port->typec_caps.type = tcfg->type;
4618 port->typec_caps.data = tcfg->data;
4619
4620 return 0;
4621}
4622
f0690a25
GR		 4623struct tcpm_port *tcpm_register_port(struct device *dev, struct tcpc_dev *tcpc)
4624{
4625 struct tcpm_port *port;
4626 int i, err;
4627
96232cbc 4628 if (!dev || !tcpc ||
f0690a25
GR		 4629 !tcpc->get_vbus || !tcpc->set_cc || !tcpc->get_cc ||
4630 !tcpc->set_polarity || !tcpc->set_vconn || !tcpc->set_vbus ||
4631 !tcpc->set_pd_rx || !tcpc->set_roles || !tcpc->pd_transmit)
4632 return ERR_PTR(-EINVAL);
4633
4634 port = devm_kzalloc(dev, sizeof(*port), GFP_KERNEL);
4635 if (!port)
4636 return ERR_PTR(-ENOMEM);
4637
4638 port->dev = dev;
4639 port->tcpc = tcpc;
4640
4641 mutex_init(&port->lock);
4642 mutex_init(&port->swap_lock);
4643
4644 port->wq = create_singlethread_workqueue(dev_name(dev));
4645 if (!port->wq)
4646 return ERR_PTR(-ENOMEM);
4647 INIT_DELAYED_WORK(&port->state_machine, tcpm_state_machine_work);
4648 INIT_DELAYED_WORK(&port->vdm_state_machine, vdm_state_machine_work);
4649 INIT_WORK(&port->event_work, tcpm_pd_event_handler);
4650
4651 spin_lock_init(&port->pd_event_lock);
4652
4653 init_completion(&port->tx_complete);
4654 init_completion(&port->swap_complete);
2eadc33f 4655 init_completion(&port->pps_complete);
5007e1b5 4656 tcpm_debugfs_init(port);
f0690a25 4657
96232cbc
LJ		 4658 err = tcpm_fw_get_caps(port, tcpc->fwnode);
4659 if ((err < 0) && tcpc->config)
4660 err = tcpm_copy_caps(port, tcpc->config);
4661 if (err < 0)
5007e1b5 4662 goto out_destroy_wq;
96232cbc
LJ		 4663
4664 if (!tcpc->config || !tcpc->config->try_role_hw)
4665 port->try_role = port->typec_caps.prefer_role;
f0690a25
GR		 4666 else
4667 port->try_role = TYPEC_NO_PREFERRED_ROLE;
4668
5e85a04c 4669 port->typec_caps.fwnode = tcpc->fwnode;
f0690a25 4670 port->typec_caps.revision = 0x0120; /* Type-C spec release 1.2 */
2eadc33f 4671 port->typec_caps.pd_revision = 0x0300; /* USB-PD spec release 3.0 */
f0690a25
GR		 4672 port->typec_caps.dr_set = tcpm_dr_set;
4673 port->typec_caps.pr_set = tcpm_pr_set;
4674 port->typec_caps.vconn_set = tcpm_vconn_set;
4675 port->typec_caps.try_role = tcpm_try_role;
9b0ae699 4676 port->typec_caps.port_type_set = tcpm_port_type_set;
f0690a25
GR		 4677
4678 port->partner_desc.identity = &port->partner_ident;
96232cbc 4679 port->port_type = port->typec_caps.type;
f0690a25 4680
2000016c
HG		 4681 port->role_sw = usb_role_switch_get(port->dev);
4682 if (IS_ERR(port->role_sw)) {
4683 err = PTR_ERR(port->role_sw);
4684 goto out_destroy_wq;
4685 }
4686
f2a8aa05
AT		 4687 err = devm_tcpm_psy_register(port);
4688 if (err)
4689 goto out_destroy_wq;
4690
f0690a25 4691 port->typec_port = typec_register_port(port->dev, &port->typec_caps);
cf6e06cd
HK		 4692 if (IS_ERR(port->typec_port)) {
4693 err = PTR_ERR(port->typec_port);
f0690a25
GR		 4694 goto out_destroy_wq;
4695 }
4696
96232cbc 4697 if (tcpc->config && tcpc->config->alt_modes) {
3c41dbde 4698 const struct typec_altmode_desc *paltmode = tcpc->config->alt_modes;
f0690a25
GR		 4699
4700 i = 0;
4701 while (paltmode->svid && i < ARRAY_SIZE(port->port_altmode)) {
cf6e06cd
HK		 4702 struct typec_altmode *alt;
4703
4704 alt = typec_port_register_altmode(port->typec_port,
4705 paltmode);
4706 if (IS_ERR(alt)) {
f0690a25
GR		 4707 tcpm_log(port,
4708 "%s: failed to register port alternate mode 0x%x",
4709 dev_name(dev), paltmode->svid);
4710 break;
4711 }
cf6e06cd 4712 port->port_altmode[i] = alt;
f0690a25
GR		 4713 i++;
4714 paltmode++;
4715 }
4716 }
4717
f0690a25
GR		 4718 mutex_lock(&port->lock);
4719 tcpm_init(port);
4720 mutex_unlock(&port->lock);
4721
4722 tcpm_log(port, "%s: registered", dev_name(dev));
4723 return port;
4724
4725out_destroy_wq:
2000016c 4726 usb_role_switch_put(port->role_sw);
f0690a25
GR		 4727 destroy_workqueue(port->wq);
4728 return ERR_PTR(err);
4729}
4730EXPORT_SYMBOL_GPL(tcpm_register_port);
4731
4732void tcpm_unregister_port(struct tcpm_port *port)
4733{
4734 int i;
4735
a6d5d230 4736 tcpm_reset_port(port);
f0690a25
GR		 4737 for (i = 0; i < ARRAY_SIZE(port->port_altmode); i++)
4738 typec_unregister_altmode(port->port_altmode[i]);
4739 typec_unregister_port(port->typec_port);
5671a460 4740 usb_role_switch_put(port->role_sw);
f0690a25
GR		 4741 tcpm_debugfs_exit(port);
4742 destroy_workqueue(port->wq);
4743}
4744EXPORT_SYMBOL_GPL(tcpm_unregister_port);
4745
4746MODULE_AUTHOR("Guenter Roeck <groeck@chromium.org>");
4747MODULE_DESCRIPTION("USB Type-C Port Manager");
4748MODULE_LICENSE("GPL");
Linux 6.x block layer and io_uring tree(s)