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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> | |
15 | #include <linux/proc_fs.h> | |
16 | #include <linux/sched/clock.h> | |
17 | #include <linux/seq_file.h> | |
18 | #include <linux/slab.h> | |
19 | #include <linux/spinlock.h> | |
4b4e02c8 GR |
20 | #include <linux/usb/pd.h> |
21 | #include <linux/usb/pd_bdo.h> | |
22 | #include <linux/usb/pd_vdo.h> | |
23 | #include <linux/usb/tcpm.h> | |
f0690a25 GR |
24 | #include <linux/usb/typec.h> |
25 | #include <linux/workqueue.h> | |
26 | ||
f0690a25 GR |
27 | #define FOREACH_STATE(S) \ |
28 | S(INVALID_STATE), \ | |
29 | S(DRP_TOGGLING), \ | |
30 | S(SRC_UNATTACHED), \ | |
31 | S(SRC_ATTACH_WAIT), \ | |
32 | S(SRC_ATTACHED), \ | |
33 | S(SRC_STARTUP), \ | |
34 | S(SRC_SEND_CAPABILITIES), \ | |
35 | S(SRC_NEGOTIATE_CAPABILITIES), \ | |
36 | S(SRC_TRANSITION_SUPPLY), \ | |
37 | S(SRC_READY), \ | |
38 | S(SRC_WAIT_NEW_CAPABILITIES), \ | |
39 | \ | |
40 | S(SNK_UNATTACHED), \ | |
41 | S(SNK_ATTACH_WAIT), \ | |
42 | S(SNK_DEBOUNCED), \ | |
43 | S(SNK_ATTACHED), \ | |
44 | S(SNK_STARTUP), \ | |
45 | S(SNK_DISCOVERY), \ | |
46 | S(SNK_DISCOVERY_DEBOUNCE), \ | |
47 | S(SNK_DISCOVERY_DEBOUNCE_DONE), \ | |
48 | S(SNK_WAIT_CAPABILITIES), \ | |
49 | S(SNK_NEGOTIATE_CAPABILITIES), \ | |
50 | S(SNK_TRANSITION_SINK), \ | |
51 | S(SNK_TRANSITION_SINK_VBUS), \ | |
52 | S(SNK_READY), \ | |
53 | \ | |
54 | S(ACC_UNATTACHED), \ | |
55 | S(DEBUG_ACC_ATTACHED), \ | |
56 | S(AUDIO_ACC_ATTACHED), \ | |
57 | S(AUDIO_ACC_DEBOUNCE), \ | |
58 | \ | |
59 | S(HARD_RESET_SEND), \ | |
60 | S(HARD_RESET_START), \ | |
61 | S(SRC_HARD_RESET_VBUS_OFF), \ | |
62 | S(SRC_HARD_RESET_VBUS_ON), \ | |
63 | S(SNK_HARD_RESET_SINK_OFF), \ | |
64 | S(SNK_HARD_RESET_WAIT_VBUS), \ | |
65 | S(SNK_HARD_RESET_SINK_ON), \ | |
66 | \ | |
67 | S(SOFT_RESET), \ | |
68 | S(SOFT_RESET_SEND), \ | |
69 | \ | |
70 | S(DR_SWAP_ACCEPT), \ | |
71 | S(DR_SWAP_SEND), \ | |
72 | S(DR_SWAP_SEND_TIMEOUT), \ | |
73 | S(DR_SWAP_CANCEL), \ | |
74 | S(DR_SWAP_CHANGE_DR), \ | |
75 | \ | |
76 | S(PR_SWAP_ACCEPT), \ | |
77 | S(PR_SWAP_SEND), \ | |
78 | S(PR_SWAP_SEND_TIMEOUT), \ | |
79 | S(PR_SWAP_CANCEL), \ | |
80 | S(PR_SWAP_START), \ | |
81 | S(PR_SWAP_SRC_SNK_TRANSITION_OFF), \ | |
82 | S(PR_SWAP_SRC_SNK_SOURCE_OFF), \ | |
b965b631 | 83 | S(PR_SWAP_SRC_SNK_SOURCE_OFF_CC_DEBOUNCED), \ |
f0690a25 GR |
84 | S(PR_SWAP_SRC_SNK_SINK_ON), \ |
85 | S(PR_SWAP_SNK_SRC_SINK_OFF), \ | |
86 | S(PR_SWAP_SNK_SRC_SOURCE_ON), \ | |
b965b631 | 87 | S(PR_SWAP_SNK_SRC_SOURCE_ON_VBUS_RAMPED_UP), \ |
f0690a25 GR |
88 | \ |
89 | S(VCONN_SWAP_ACCEPT), \ | |
90 | S(VCONN_SWAP_SEND), \ | |
91 | S(VCONN_SWAP_SEND_TIMEOUT), \ | |
92 | S(VCONN_SWAP_CANCEL), \ | |
93 | S(VCONN_SWAP_START), \ | |
94 | S(VCONN_SWAP_WAIT_FOR_VCONN), \ | |
95 | S(VCONN_SWAP_TURN_ON_VCONN), \ | |
96 | S(VCONN_SWAP_TURN_OFF_VCONN), \ | |
97 | \ | |
98 | S(SNK_TRY), \ | |
99 | S(SNK_TRY_WAIT), \ | |
a0a3e04e BJS |
100 | S(SNK_TRY_WAIT_DEBOUNCE), \ |
101 | S(SNK_TRY_WAIT_DEBOUNCE_CHECK_VBUS), \ | |
f0690a25 | 102 | S(SRC_TRYWAIT), \ |
02d5be46 | 103 | S(SRC_TRYWAIT_DEBOUNCE), \ |
f0690a25 GR |
104 | S(SRC_TRYWAIT_UNATTACHED), \ |
105 | \ | |
106 | S(SRC_TRY), \ | |
131c7d12 | 107 | S(SRC_TRY_WAIT), \ |
f0690a25 GR |
108 | S(SRC_TRY_DEBOUNCE), \ |
109 | S(SNK_TRYWAIT), \ | |
110 | S(SNK_TRYWAIT_DEBOUNCE), \ | |
111 | S(SNK_TRYWAIT_VBUS), \ | |
112 | S(BIST_RX), \ | |
113 | \ | |
114 | S(ERROR_RECOVERY), \ | |
b17dd571 GR |
115 | S(PORT_RESET), \ |
116 | S(PORT_RESET_WAIT_OFF) | |
f0690a25 GR |
117 | |
118 | #define GENERATE_ENUM(e) e | |
119 | #define GENERATE_STRING(s) #s | |
120 | ||
121 | enum tcpm_state { | |
122 | FOREACH_STATE(GENERATE_ENUM) | |
123 | }; | |
124 | ||
125 | static const char * const tcpm_states[] = { | |
126 | FOREACH_STATE(GENERATE_STRING) | |
127 | }; | |
128 | ||
129 | enum vdm_states { | |
130 | VDM_STATE_ERR_BUSY = -3, | |
131 | VDM_STATE_ERR_SEND = -2, | |
132 | VDM_STATE_ERR_TMOUT = -1, | |
133 | VDM_STATE_DONE = 0, | |
134 | /* Anything >0 represents an active state */ | |
135 | VDM_STATE_READY = 1, | |
136 | VDM_STATE_BUSY = 2, | |
137 | VDM_STATE_WAIT_RSP_BUSY = 3, | |
138 | }; | |
139 | ||
140 | enum pd_msg_request { | |
141 | PD_MSG_NONE = 0, | |
142 | PD_MSG_CTRL_REJECT, | |
143 | PD_MSG_CTRL_WAIT, | |
144 | PD_MSG_DATA_SINK_CAP, | |
145 | PD_MSG_DATA_SOURCE_CAP, | |
146 | }; | |
147 | ||
148 | /* Events from low level driver */ | |
149 | ||
150 | #define TCPM_CC_EVENT BIT(0) | |
151 | #define TCPM_VBUS_EVENT BIT(1) | |
152 | #define TCPM_RESET_EVENT BIT(2) | |
153 | ||
154 | #define LOG_BUFFER_ENTRIES 1024 | |
155 | #define LOG_BUFFER_ENTRY_SIZE 128 | |
156 | ||
157 | /* Alternate mode support */ | |
158 | ||
159 | #define SVID_DISCOVERY_MAX 16 | |
160 | ||
161 | struct pd_mode_data { | |
162 | int svid_index; /* current SVID index */ | |
163 | int nsvids; | |
164 | u16 svids[SVID_DISCOVERY_MAX]; | |
165 | int altmodes; /* number of alternate modes */ | |
166 | struct typec_altmode_desc altmode_desc[SVID_DISCOVERY_MAX]; | |
167 | }; | |
168 | ||
169 | struct tcpm_port { | |
170 | struct device *dev; | |
171 | ||
172 | struct mutex lock; /* tcpm state machine lock */ | |
173 | struct workqueue_struct *wq; | |
174 | ||
175 | struct typec_capability typec_caps; | |
176 | struct typec_port *typec_port; | |
177 | ||
178 | struct tcpc_dev *tcpc; | |
179 | ||
180 | enum typec_role vconn_role; | |
181 | enum typec_role pwr_role; | |
182 | enum typec_data_role data_role; | |
183 | enum typec_pwr_opmode pwr_opmode; | |
184 | ||
185 | struct usb_pd_identity partner_ident; | |
186 | struct typec_partner_desc partner_desc; | |
187 | struct typec_partner *partner; | |
188 | ||
189 | enum typec_cc_status cc_req; | |
190 | ||
191 | enum typec_cc_status cc1; | |
192 | enum typec_cc_status cc2; | |
193 | enum typec_cc_polarity polarity; | |
194 | ||
195 | bool attached; | |
196 | bool connected; | |
9b0ae699 | 197 | enum typec_port_type port_type; |
f0690a25 GR |
198 | bool vbus_present; |
199 | bool vbus_never_low; | |
200 | bool vbus_source; | |
201 | bool vbus_charge; | |
202 | ||
203 | bool send_discover; | |
204 | bool op_vsafe5v; | |
205 | ||
206 | int try_role; | |
207 | int try_snk_count; | |
208 | int try_src_count; | |
209 | ||
210 | enum pd_msg_request queued_message; | |
211 | ||
212 | enum tcpm_state enter_state; | |
213 | enum tcpm_state prev_state; | |
214 | enum tcpm_state state; | |
215 | enum tcpm_state delayed_state; | |
216 | unsigned long delayed_runtime; | |
217 | unsigned long delay_ms; | |
218 | ||
219 | spinlock_t pd_event_lock; | |
220 | u32 pd_events; | |
221 | ||
222 | struct work_struct event_work; | |
223 | struct delayed_work state_machine; | |
224 | struct delayed_work vdm_state_machine; | |
225 | bool state_machine_running; | |
226 | ||
227 | struct completion tx_complete; | |
228 | enum tcpm_transmit_status tx_status; | |
229 | ||
230 | struct mutex swap_lock; /* swap command lock */ | |
231 | bool swap_pending; | |
b17dd571 | 232 | bool non_pd_role_swap; |
f0690a25 GR |
233 | struct completion swap_complete; |
234 | int swap_status; | |
235 | ||
236 | unsigned int message_id; | |
237 | unsigned int caps_count; | |
238 | unsigned int hard_reset_count; | |
239 | bool pd_capable; | |
240 | bool explicit_contract; | |
5fec4b54 | 241 | unsigned int rx_msgid; |
f0690a25 GR |
242 | |
243 | /* Partner capabilities/requests */ | |
244 | u32 sink_request; | |
245 | u32 source_caps[PDO_MAX_OBJECTS]; | |
246 | unsigned int nr_source_caps; | |
247 | u32 sink_caps[PDO_MAX_OBJECTS]; | |
248 | unsigned int nr_sink_caps; | |
249 | ||
250 | /* Local capabilities */ | |
251 | u32 src_pdo[PDO_MAX_OBJECTS]; | |
252 | unsigned int nr_src_pdo; | |
253 | u32 snk_pdo[PDO_MAX_OBJECTS]; | |
254 | unsigned int nr_snk_pdo; | |
193a6801 GR |
255 | u32 snk_vdo[VDO_MAX_OBJECTS]; |
256 | unsigned int nr_snk_vdo; | |
f0690a25 GR |
257 | |
258 | unsigned int max_snk_mv; | |
259 | unsigned int max_snk_ma; | |
260 | unsigned int max_snk_mw; | |
261 | unsigned int operating_snk_mw; | |
262 | ||
263 | /* Requested current / voltage */ | |
264 | u32 current_limit; | |
265 | u32 supply_voltage; | |
266 | ||
267 | u32 bist_request; | |
268 | ||
269 | /* PD state for Vendor Defined Messages */ | |
270 | enum vdm_states vdm_state; | |
271 | u32 vdm_retries; | |
272 | /* next Vendor Defined Message to send */ | |
273 | u32 vdo_data[VDO_MAX_SIZE]; | |
274 | u8 vdo_count; | |
275 | /* VDO to retry if UFP responder replied busy */ | |
276 | u32 vdo_retry; | |
277 | ||
278 | /* Alternate mode data */ | |
279 | ||
280 | struct pd_mode_data mode_data; | |
281 | struct typec_altmode *partner_altmode[SVID_DISCOVERY_MAX]; | |
282 | struct typec_altmode *port_altmode[SVID_DISCOVERY_MAX]; | |
283 | ||
02d5be46 BJS |
284 | /* Deadline in jiffies to exit src_try_wait state */ |
285 | unsigned long max_wait; | |
286 | ||
f0690a25 GR |
287 | #ifdef CONFIG_DEBUG_FS |
288 | struct dentry *dentry; | |
289 | struct mutex logbuffer_lock; /* log buffer access lock */ | |
290 | int logbuffer_head; | |
291 | int logbuffer_tail; | |
292 | u8 *logbuffer[LOG_BUFFER_ENTRIES]; | |
293 | #endif | |
294 | }; | |
295 | ||
296 | struct pd_rx_event { | |
297 | struct work_struct work; | |
298 | struct tcpm_port *port; | |
299 | struct pd_message msg; | |
300 | }; | |
301 | ||
302 | #define tcpm_cc_is_sink(cc) \ | |
303 | ((cc) == TYPEC_CC_RP_DEF || (cc) == TYPEC_CC_RP_1_5 || \ | |
304 | (cc) == TYPEC_CC_RP_3_0) | |
305 | ||
306 | #define tcpm_port_is_sink(port) \ | |
307 | ((tcpm_cc_is_sink((port)->cc1) && !tcpm_cc_is_sink((port)->cc2)) || \ | |
308 | (tcpm_cc_is_sink((port)->cc2) && !tcpm_cc_is_sink((port)->cc1))) | |
309 | ||
310 | #define tcpm_cc_is_source(cc) ((cc) == TYPEC_CC_RD) | |
311 | #define tcpm_cc_is_audio(cc) ((cc) == TYPEC_CC_RA) | |
312 | #define tcpm_cc_is_open(cc) ((cc) == TYPEC_CC_OPEN) | |
313 | ||
314 | #define tcpm_port_is_source(port) \ | |
315 | ((tcpm_cc_is_source((port)->cc1) && \ | |
316 | !tcpm_cc_is_source((port)->cc2)) || \ | |
317 | (tcpm_cc_is_source((port)->cc2) && \ | |
318 | !tcpm_cc_is_source((port)->cc1))) | |
319 | ||
320 | #define tcpm_port_is_debug(port) \ | |
321 | (tcpm_cc_is_source((port)->cc1) && tcpm_cc_is_source((port)->cc2)) | |
322 | ||
323 | #define tcpm_port_is_audio(port) \ | |
324 | (tcpm_cc_is_audio((port)->cc1) && tcpm_cc_is_audio((port)->cc2)) | |
325 | ||
326 | #define tcpm_port_is_audio_detached(port) \ | |
327 | ((tcpm_cc_is_audio((port)->cc1) && tcpm_cc_is_open((port)->cc2)) || \ | |
328 | (tcpm_cc_is_audio((port)->cc2) && tcpm_cc_is_open((port)->cc1))) | |
329 | ||
330 | #define tcpm_try_snk(port) \ | |
ff6c8cb1 BJS |
331 | ((port)->try_snk_count == 0 && (port)->try_role == TYPEC_SINK && \ |
332 | (port)->port_type == TYPEC_PORT_DRP) | |
f0690a25 GR |
333 | |
334 | #define tcpm_try_src(port) \ | |
ff6c8cb1 BJS |
335 | ((port)->try_src_count == 0 && (port)->try_role == TYPEC_SOURCE && \ |
336 | (port)->port_type == TYPEC_PORT_DRP) | |
f0690a25 GR |
337 | |
338 | static enum tcpm_state tcpm_default_state(struct tcpm_port *port) | |
339 | { | |
9b0ae699 | 340 | if (port->port_type == TYPEC_PORT_DRP) { |
b46a9c90 BJS |
341 | if (port->try_role == TYPEC_SINK) |
342 | return SNK_UNATTACHED; | |
343 | else if (port->try_role == TYPEC_SOURCE) | |
344 | return SRC_UNATTACHED; | |
345 | else if (port->tcpc->config->default_role == TYPEC_SINK) | |
346 | return SNK_UNATTACHED; | |
347 | /* Fall through to return SRC_UNATTACHED */ | |
9b0ae699 | 348 | } else if (port->port_type == TYPEC_PORT_UFP) { |
f0690a25 | 349 | return SNK_UNATTACHED; |
b46a9c90 | 350 | } |
f0690a25 GR |
351 | return SRC_UNATTACHED; |
352 | } | |
353 | ||
354 | static inline | |
355 | struct tcpm_port *typec_cap_to_tcpm(const struct typec_capability *cap) | |
356 | { | |
357 | return container_of(cap, struct tcpm_port, typec_caps); | |
358 | } | |
359 | ||
360 | static bool tcpm_port_is_disconnected(struct tcpm_port *port) | |
361 | { | |
362 | return (!port->attached && port->cc1 == TYPEC_CC_OPEN && | |
363 | port->cc2 == TYPEC_CC_OPEN) || | |
364 | (port->attached && ((port->polarity == TYPEC_POLARITY_CC1 && | |
365 | port->cc1 == TYPEC_CC_OPEN) || | |
366 | (port->polarity == TYPEC_POLARITY_CC2 && | |
367 | port->cc2 == TYPEC_CC_OPEN))); | |
368 | } | |
369 | ||
370 | /* | |
371 | * Logging | |
372 | */ | |
373 | ||
374 | #ifdef CONFIG_DEBUG_FS | |
375 | ||
376 | static bool tcpm_log_full(struct tcpm_port *port) | |
377 | { | |
378 | return port->logbuffer_tail == | |
379 | (port->logbuffer_head + 1) % LOG_BUFFER_ENTRIES; | |
380 | } | |
381 | ||
e79e0125 | 382 | __printf(2, 0) |
f0690a25 GR |
383 | static void _tcpm_log(struct tcpm_port *port, const char *fmt, va_list args) |
384 | { | |
385 | char tmpbuffer[LOG_BUFFER_ENTRY_SIZE]; | |
386 | u64 ts_nsec = local_clock(); | |
387 | unsigned long rem_nsec; | |
388 | ||
389 | if (!port->logbuffer[port->logbuffer_head]) { | |
390 | port->logbuffer[port->logbuffer_head] = | |
391 | kzalloc(LOG_BUFFER_ENTRY_SIZE, GFP_KERNEL); | |
392 | if (!port->logbuffer[port->logbuffer_head]) | |
393 | return; | |
394 | } | |
395 | ||
396 | vsnprintf(tmpbuffer, sizeof(tmpbuffer), fmt, args); | |
397 | ||
398 | mutex_lock(&port->logbuffer_lock); | |
399 | ||
400 | if (tcpm_log_full(port)) { | |
401 | port->logbuffer_head = max(port->logbuffer_head - 1, 0); | |
402 | strcpy(tmpbuffer, "overflow"); | |
403 | } | |
404 | ||
405 | if (port->logbuffer_head < 0 || | |
406 | port->logbuffer_head >= LOG_BUFFER_ENTRIES) { | |
407 | dev_warn(port->dev, | |
408 | "Bad log buffer index %d\n", port->logbuffer_head); | |
409 | goto abort; | |
410 | } | |
411 | ||
412 | if (!port->logbuffer[port->logbuffer_head]) { | |
413 | dev_warn(port->dev, | |
414 | "Log buffer index %d is NULL\n", port->logbuffer_head); | |
415 | goto abort; | |
416 | } | |
417 | ||
418 | rem_nsec = do_div(ts_nsec, 1000000000); | |
419 | scnprintf(port->logbuffer[port->logbuffer_head], | |
420 | LOG_BUFFER_ENTRY_SIZE, "[%5lu.%06lu] %s", | |
421 | (unsigned long)ts_nsec, rem_nsec / 1000, | |
422 | tmpbuffer); | |
423 | port->logbuffer_head = (port->logbuffer_head + 1) % LOG_BUFFER_ENTRIES; | |
424 | ||
425 | abort: | |
426 | mutex_unlock(&port->logbuffer_lock); | |
427 | } | |
428 | ||
e79e0125 | 429 | __printf(2, 3) |
f0690a25 GR |
430 | static void tcpm_log(struct tcpm_port *port, const char *fmt, ...) |
431 | { | |
432 | va_list args; | |
433 | ||
434 | /* Do not log while disconnected and unattached */ | |
435 | if (tcpm_port_is_disconnected(port) && | |
436 | (port->state == SRC_UNATTACHED || port->state == SNK_UNATTACHED || | |
437 | port->state == DRP_TOGGLING)) | |
438 | return; | |
439 | ||
440 | va_start(args, fmt); | |
441 | _tcpm_log(port, fmt, args); | |
442 | va_end(args); | |
443 | } | |
444 | ||
e79e0125 | 445 | __printf(2, 3) |
f0690a25 GR |
446 | static void tcpm_log_force(struct tcpm_port *port, const char *fmt, ...) |
447 | { | |
448 | va_list args; | |
449 | ||
450 | va_start(args, fmt); | |
451 | _tcpm_log(port, fmt, args); | |
452 | va_end(args); | |
453 | } | |
454 | ||
455 | static void tcpm_log_source_caps(struct tcpm_port *port) | |
456 | { | |
457 | int i; | |
458 | ||
459 | for (i = 0; i < port->nr_source_caps; i++) { | |
460 | u32 pdo = port->source_caps[i]; | |
461 | enum pd_pdo_type type = pdo_type(pdo); | |
462 | char msg[64]; | |
463 | ||
464 | switch (type) { | |
465 | case PDO_TYPE_FIXED: | |
466 | scnprintf(msg, sizeof(msg), | |
467 | "%u mV, %u mA [%s%s%s%s%s%s]", | |
468 | pdo_fixed_voltage(pdo), | |
469 | pdo_max_current(pdo), | |
470 | (pdo & PDO_FIXED_DUAL_ROLE) ? | |
471 | "R" : "", | |
472 | (pdo & PDO_FIXED_SUSPEND) ? | |
473 | "S" : "", | |
474 | (pdo & PDO_FIXED_HIGHER_CAP) ? | |
475 | "H" : "", | |
476 | (pdo & PDO_FIXED_USB_COMM) ? | |
477 | "U" : "", | |
478 | (pdo & PDO_FIXED_DATA_SWAP) ? | |
479 | "D" : "", | |
480 | (pdo & PDO_FIXED_EXTPOWER) ? | |
481 | "E" : ""); | |
482 | break; | |
483 | case PDO_TYPE_VAR: | |
484 | scnprintf(msg, sizeof(msg), | |
485 | "%u-%u mV, %u mA", | |
486 | pdo_min_voltage(pdo), | |
487 | pdo_max_voltage(pdo), | |
488 | pdo_max_current(pdo)); | |
489 | break; | |
490 | case PDO_TYPE_BATT: | |
491 | scnprintf(msg, sizeof(msg), | |
492 | "%u-%u mV, %u mW", | |
493 | pdo_min_voltage(pdo), | |
494 | pdo_max_voltage(pdo), | |
495 | pdo_max_power(pdo)); | |
496 | break; | |
497 | default: | |
498 | strcpy(msg, "undefined"); | |
499 | break; | |
500 | } | |
501 | tcpm_log(port, " PDO %d: type %d, %s", | |
502 | i, type, msg); | |
503 | } | |
504 | } | |
505 | ||
506 | static int tcpm_seq_show(struct seq_file *s, void *v) | |
507 | { | |
508 | struct tcpm_port *port = (struct tcpm_port *)s->private; | |
509 | int tail; | |
510 | ||
511 | mutex_lock(&port->logbuffer_lock); | |
512 | tail = port->logbuffer_tail; | |
513 | while (tail != port->logbuffer_head) { | |
514 | seq_printf(s, "%s\n", port->logbuffer[tail]); | |
515 | tail = (tail + 1) % LOG_BUFFER_ENTRIES; | |
516 | } | |
517 | if (!seq_has_overflowed(s)) | |
518 | port->logbuffer_tail = tail; | |
519 | mutex_unlock(&port->logbuffer_lock); | |
520 | ||
521 | return 0; | |
522 | } | |
523 | ||
524 | static int tcpm_debug_open(struct inode *inode, struct file *file) | |
525 | { | |
526 | return single_open(file, tcpm_seq_show, inode->i_private); | |
527 | } | |
528 | ||
529 | static const struct file_operations tcpm_debug_operations = { | |
530 | .open = tcpm_debug_open, | |
531 | .llseek = seq_lseek, | |
532 | .read = seq_read, | |
533 | .release = single_release, | |
534 | }; | |
535 | ||
536 | static struct dentry *rootdir; | |
537 | ||
538 | static int tcpm_debugfs_init(struct tcpm_port *port) | |
539 | { | |
540 | mutex_init(&port->logbuffer_lock); | |
541 | /* /sys/kernel/debug/tcpm/usbcX */ | |
542 | if (!rootdir) { | |
543 | rootdir = debugfs_create_dir("tcpm", NULL); | |
544 | if (!rootdir) | |
545 | return -ENOMEM; | |
546 | } | |
547 | ||
548 | port->dentry = debugfs_create_file(dev_name(port->dev), | |
549 | S_IFREG | 0444, rootdir, | |
550 | port, &tcpm_debug_operations); | |
551 | ||
552 | return 0; | |
553 | } | |
554 | ||
555 | static void tcpm_debugfs_exit(struct tcpm_port *port) | |
556 | { | |
557 | debugfs_remove(port->dentry); | |
558 | } | |
559 | ||
560 | #else | |
561 | ||
e79e0125 | 562 | __printf(2, 3) |
f0690a25 | 563 | static void tcpm_log(const struct tcpm_port *port, const char *fmt, ...) { } |
e79e0125 | 564 | __printf(2, 3) |
f0690a25 GR |
565 | static void tcpm_log_force(struct tcpm_port *port, const char *fmt, ...) { } |
566 | static void tcpm_log_source_caps(struct tcpm_port *port) { } | |
567 | static int tcpm_debugfs_init(const struct tcpm_port *port) { return 0; } | |
568 | static void tcpm_debugfs_exit(const struct tcpm_port *port) { } | |
569 | ||
570 | #endif | |
571 | ||
572 | static int tcpm_pd_transmit(struct tcpm_port *port, | |
573 | enum tcpm_transmit_type type, | |
574 | const struct pd_message *msg) | |
575 | { | |
576 | unsigned long timeout; | |
577 | int ret; | |
578 | ||
579 | if (msg) | |
580 | tcpm_log(port, "PD TX, header: %#x", le16_to_cpu(msg->header)); | |
581 | else | |
582 | tcpm_log(port, "PD TX, type: %#x", type); | |
583 | ||
584 | reinit_completion(&port->tx_complete); | |
585 | ret = port->tcpc->pd_transmit(port->tcpc, type, msg); | |
586 | if (ret < 0) | |
587 | return ret; | |
588 | ||
589 | mutex_unlock(&port->lock); | |
590 | timeout = wait_for_completion_timeout(&port->tx_complete, | |
591 | msecs_to_jiffies(PD_T_TCPC_TX_TIMEOUT)); | |
592 | mutex_lock(&port->lock); | |
593 | if (!timeout) | |
594 | return -ETIMEDOUT; | |
595 | ||
596 | switch (port->tx_status) { | |
597 | case TCPC_TX_SUCCESS: | |
598 | port->message_id = (port->message_id + 1) & PD_HEADER_ID_MASK; | |
599 | return 0; | |
600 | case TCPC_TX_DISCARDED: | |
601 | return -EAGAIN; | |
602 | case TCPC_TX_FAILED: | |
603 | default: | |
604 | return -EIO; | |
605 | } | |
606 | } | |
607 | ||
608 | void tcpm_pd_transmit_complete(struct tcpm_port *port, | |
609 | enum tcpm_transmit_status status) | |
610 | { | |
611 | tcpm_log(port, "PD TX complete, status: %u", status); | |
612 | port->tx_status = status; | |
613 | complete(&port->tx_complete); | |
614 | } | |
615 | EXPORT_SYMBOL_GPL(tcpm_pd_transmit_complete); | |
616 | ||
617 | static int tcpm_mux_set(struct tcpm_port *port, enum tcpc_mux_mode mode, | |
618 | enum tcpc_usb_switch config) | |
619 | { | |
620 | int ret = 0; | |
621 | ||
622 | tcpm_log(port, "Requesting mux mode %d, config %d, polarity %d", | |
623 | mode, config, port->polarity); | |
624 | ||
625 | if (port->tcpc->mux) | |
626 | ret = port->tcpc->mux->set(port->tcpc->mux, mode, config, | |
627 | port->polarity); | |
628 | ||
629 | return ret; | |
630 | } | |
631 | ||
632 | static int tcpm_set_polarity(struct tcpm_port *port, | |
633 | enum typec_cc_polarity polarity) | |
634 | { | |
635 | int ret; | |
636 | ||
637 | tcpm_log(port, "polarity %d", polarity); | |
638 | ||
639 | ret = port->tcpc->set_polarity(port->tcpc, polarity); | |
640 | if (ret < 0) | |
641 | return ret; | |
642 | ||
643 | port->polarity = polarity; | |
644 | ||
645 | return 0; | |
646 | } | |
647 | ||
648 | static int tcpm_set_vconn(struct tcpm_port *port, bool enable) | |
649 | { | |
650 | int ret; | |
651 | ||
652 | tcpm_log(port, "vconn:=%d", enable); | |
653 | ||
654 | ret = port->tcpc->set_vconn(port->tcpc, enable); | |
655 | if (!ret) { | |
656 | port->vconn_role = enable ? TYPEC_SOURCE : TYPEC_SINK; | |
657 | typec_set_vconn_role(port->typec_port, port->vconn_role); | |
658 | } | |
659 | ||
660 | return ret; | |
661 | } | |
662 | ||
663 | static u32 tcpm_get_current_limit(struct tcpm_port *port) | |
664 | { | |
665 | enum typec_cc_status cc; | |
666 | u32 limit; | |
667 | ||
668 | cc = port->polarity ? port->cc2 : port->cc1; | |
669 | switch (cc) { | |
670 | case TYPEC_CC_RP_1_5: | |
671 | limit = 1500; | |
672 | break; | |
673 | case TYPEC_CC_RP_3_0: | |
674 | limit = 3000; | |
675 | break; | |
676 | case TYPEC_CC_RP_DEF: | |
677 | default: | |
ea62cfc7 HG |
678 | if (port->tcpc->get_current_limit) |
679 | limit = port->tcpc->get_current_limit(port->tcpc); | |
680 | else | |
681 | limit = 0; | |
f0690a25 GR |
682 | break; |
683 | } | |
684 | ||
685 | return limit; | |
686 | } | |
687 | ||
688 | static int tcpm_set_current_limit(struct tcpm_port *port, u32 max_ma, u32 mv) | |
689 | { | |
690 | int ret = -EOPNOTSUPP; | |
691 | ||
692 | tcpm_log(port, "Setting voltage/current limit %u mV %u mA", mv, max_ma); | |
693 | ||
694 | if (port->tcpc->set_current_limit) | |
695 | ret = port->tcpc->set_current_limit(port->tcpc, max_ma, mv); | |
696 | ||
697 | return ret; | |
698 | } | |
699 | ||
700 | /* | |
701 | * Determine RP value to set based on maximum current supported | |
702 | * by a port if configured as source. | |
703 | * Returns CC value to report to link partner. | |
704 | */ | |
705 | static enum typec_cc_status tcpm_rp_cc(struct tcpm_port *port) | |
706 | { | |
707 | const u32 *src_pdo = port->src_pdo; | |
708 | int nr_pdo = port->nr_src_pdo; | |
709 | int i; | |
710 | ||
711 | /* | |
712 | * Search for first entry with matching voltage. | |
713 | * It should report the maximum supported current. | |
714 | */ | |
715 | for (i = 0; i < nr_pdo; i++) { | |
716 | const u32 pdo = src_pdo[i]; | |
717 | ||
718 | if (pdo_type(pdo) == PDO_TYPE_FIXED && | |
719 | pdo_fixed_voltage(pdo) == 5000) { | |
720 | unsigned int curr = pdo_max_current(pdo); | |
721 | ||
722 | if (curr >= 3000) | |
723 | return TYPEC_CC_RP_3_0; | |
724 | else if (curr >= 1500) | |
725 | return TYPEC_CC_RP_1_5; | |
726 | return TYPEC_CC_RP_DEF; | |
727 | } | |
728 | } | |
729 | ||
730 | return TYPEC_CC_RP_DEF; | |
731 | } | |
732 | ||
733 | static int tcpm_set_attached_state(struct tcpm_port *port, bool attached) | |
734 | { | |
735 | return port->tcpc->set_roles(port->tcpc, attached, port->pwr_role, | |
736 | port->data_role); | |
737 | } | |
738 | ||
739 | static int tcpm_set_roles(struct tcpm_port *port, bool attached, | |
740 | enum typec_role role, enum typec_data_role data) | |
741 | { | |
742 | int ret; | |
743 | ||
744 | if (data == TYPEC_HOST) | |
745 | ret = tcpm_mux_set(port, TYPEC_MUX_USB, | |
746 | TCPC_USB_SWITCH_CONNECT); | |
747 | else | |
748 | ret = tcpm_mux_set(port, TYPEC_MUX_NONE, | |
749 | TCPC_USB_SWITCH_DISCONNECT); | |
750 | if (ret < 0) | |
751 | return ret; | |
752 | ||
753 | ret = port->tcpc->set_roles(port->tcpc, attached, role, data); | |
754 | if (ret < 0) | |
755 | return ret; | |
756 | ||
757 | port->pwr_role = role; | |
758 | port->data_role = data; | |
759 | typec_set_data_role(port->typec_port, data); | |
760 | typec_set_pwr_role(port->typec_port, role); | |
761 | ||
762 | return 0; | |
763 | } | |
764 | ||
765 | static int tcpm_set_pwr_role(struct tcpm_port *port, enum typec_role role) | |
766 | { | |
767 | int ret; | |
768 | ||
769 | ret = port->tcpc->set_roles(port->tcpc, true, role, | |
770 | port->data_role); | |
771 | if (ret < 0) | |
772 | return ret; | |
773 | ||
774 | port->pwr_role = role; | |
775 | typec_set_pwr_role(port->typec_port, role); | |
776 | ||
777 | return 0; | |
778 | } | |
779 | ||
780 | static int tcpm_pd_send_source_caps(struct tcpm_port *port) | |
781 | { | |
782 | struct pd_message msg; | |
783 | int i; | |
784 | ||
785 | memset(&msg, 0, sizeof(msg)); | |
786 | if (!port->nr_src_pdo) { | |
787 | /* No source capabilities defined, sink only */ | |
788 | msg.header = PD_HEADER_LE(PD_CTRL_REJECT, | |
789 | port->pwr_role, | |
790 | port->data_role, | |
791 | port->message_id, 0); | |
792 | } else { | |
793 | msg.header = PD_HEADER_LE(PD_DATA_SOURCE_CAP, | |
794 | port->pwr_role, | |
795 | port->data_role, | |
796 | port->message_id, | |
797 | port->nr_src_pdo); | |
798 | } | |
799 | for (i = 0; i < port->nr_src_pdo; i++) | |
800 | msg.payload[i] = cpu_to_le32(port->src_pdo[i]); | |
801 | ||
802 | return tcpm_pd_transmit(port, TCPC_TX_SOP, &msg); | |
803 | } | |
804 | ||
805 | static int tcpm_pd_send_sink_caps(struct tcpm_port *port) | |
806 | { | |
807 | struct pd_message msg; | |
808 | int i; | |
809 | ||
810 | memset(&msg, 0, sizeof(msg)); | |
811 | if (!port->nr_snk_pdo) { | |
812 | /* No sink capabilities defined, source only */ | |
813 | msg.header = PD_HEADER_LE(PD_CTRL_REJECT, | |
814 | port->pwr_role, | |
815 | port->data_role, | |
816 | port->message_id, 0); | |
817 | } else { | |
818 | msg.header = PD_HEADER_LE(PD_DATA_SINK_CAP, | |
819 | port->pwr_role, | |
820 | port->data_role, | |
821 | port->message_id, | |
822 | port->nr_snk_pdo); | |
823 | } | |
824 | for (i = 0; i < port->nr_snk_pdo; i++) | |
825 | msg.payload[i] = cpu_to_le32(port->snk_pdo[i]); | |
826 | ||
827 | return tcpm_pd_transmit(port, TCPC_TX_SOP, &msg); | |
828 | } | |
829 | ||
830 | static void tcpm_set_state(struct tcpm_port *port, enum tcpm_state state, | |
831 | unsigned int delay_ms) | |
832 | { | |
833 | if (delay_ms) { | |
834 | tcpm_log(port, "pending state change %s -> %s @ %u ms", | |
835 | tcpm_states[port->state], tcpm_states[state], | |
836 | delay_ms); | |
837 | port->delayed_state = state; | |
838 | mod_delayed_work(port->wq, &port->state_machine, | |
839 | msecs_to_jiffies(delay_ms)); | |
840 | port->delayed_runtime = jiffies + msecs_to_jiffies(delay_ms); | |
841 | port->delay_ms = delay_ms; | |
842 | } else { | |
843 | tcpm_log(port, "state change %s -> %s", | |
844 | tcpm_states[port->state], tcpm_states[state]); | |
845 | port->delayed_state = INVALID_STATE; | |
846 | port->prev_state = port->state; | |
847 | port->state = state; | |
848 | /* | |
849 | * Don't re-queue the state machine work item if we're currently | |
850 | * in the state machine and we're immediately changing states. | |
851 | * tcpm_state_machine_work() will continue running the state | |
852 | * machine. | |
853 | */ | |
854 | if (!port->state_machine_running) | |
855 | mod_delayed_work(port->wq, &port->state_machine, 0); | |
856 | } | |
857 | } | |
858 | ||
859 | static void tcpm_set_state_cond(struct tcpm_port *port, enum tcpm_state state, | |
860 | unsigned int delay_ms) | |
861 | { | |
862 | if (port->enter_state == port->state) | |
863 | tcpm_set_state(port, state, delay_ms); | |
864 | else | |
865 | tcpm_log(port, | |
866 | "skipped %sstate change %s -> %s [%u ms], context state %s", | |
867 | delay_ms ? "delayed " : "", | |
868 | tcpm_states[port->state], tcpm_states[state], | |
869 | delay_ms, tcpm_states[port->enter_state]); | |
870 | } | |
871 | ||
872 | static void tcpm_queue_message(struct tcpm_port *port, | |
873 | enum pd_msg_request message) | |
874 | { | |
875 | port->queued_message = message; | |
876 | mod_delayed_work(port->wq, &port->state_machine, 0); | |
877 | } | |
878 | ||
879 | /* | |
880 | * VDM/VDO handling functions | |
881 | */ | |
882 | static void tcpm_queue_vdm(struct tcpm_port *port, const u32 header, | |
883 | const u32 *data, int cnt) | |
884 | { | |
885 | port->vdo_count = cnt + 1; | |
886 | port->vdo_data[0] = header; | |
887 | memcpy(&port->vdo_data[1], data, sizeof(u32) * cnt); | |
888 | /* Set ready, vdm state machine will actually send */ | |
889 | port->vdm_retries = 0; | |
890 | port->vdm_state = VDM_STATE_READY; | |
891 | } | |
892 | ||
893 | static void svdm_consume_identity(struct tcpm_port *port, const __le32 *payload, | |
894 | int cnt) | |
895 | { | |
896 | u32 vdo = le32_to_cpu(payload[VDO_INDEX_IDH]); | |
897 | u32 product = le32_to_cpu(payload[VDO_INDEX_PRODUCT]); | |
898 | ||
899 | memset(&port->mode_data, 0, sizeof(port->mode_data)); | |
900 | ||
f0690a25 GR |
901 | port->partner_ident.id_header = vdo; |
902 | port->partner_ident.cert_stat = le32_to_cpu(payload[VDO_INDEX_CSTAT]); | |
903 | port->partner_ident.product = product; | |
904 | ||
905 | typec_partner_set_identity(port->partner); | |
906 | ||
907 | tcpm_log(port, "Identity: %04x:%04x.%04x", | |
908 | PD_IDH_VID(vdo), | |
909 | PD_PRODUCT_PID(product), product & 0xffff); | |
910 | } | |
911 | ||
912 | static bool svdm_consume_svids(struct tcpm_port *port, const __le32 *payload, | |
913 | int cnt) | |
914 | { | |
915 | struct pd_mode_data *pmdata = &port->mode_data; | |
916 | int i; | |
917 | ||
918 | for (i = 1; i < cnt; i++) { | |
919 | u32 p = le32_to_cpu(payload[i]); | |
920 | u16 svid; | |
921 | ||
922 | svid = (p >> 16) & 0xffff; | |
923 | if (!svid) | |
924 | return false; | |
925 | ||
926 | if (pmdata->nsvids >= SVID_DISCOVERY_MAX) | |
927 | goto abort; | |
928 | ||
929 | pmdata->svids[pmdata->nsvids++] = svid; | |
930 | tcpm_log(port, "SVID %d: 0x%x", pmdata->nsvids, svid); | |
931 | ||
932 | svid = p & 0xffff; | |
933 | if (!svid) | |
934 | return false; | |
935 | ||
936 | if (pmdata->nsvids >= SVID_DISCOVERY_MAX) | |
937 | goto abort; | |
938 | ||
939 | pmdata->svids[pmdata->nsvids++] = svid; | |
940 | tcpm_log(port, "SVID %d: 0x%x", pmdata->nsvids, svid); | |
941 | } | |
942 | return true; | |
943 | abort: | |
944 | tcpm_log(port, "SVID_DISCOVERY_MAX(%d) too low!", SVID_DISCOVERY_MAX); | |
945 | return false; | |
946 | } | |
947 | ||
948 | static void svdm_consume_modes(struct tcpm_port *port, const __le32 *payload, | |
949 | int cnt) | |
950 | { | |
951 | struct pd_mode_data *pmdata = &port->mode_data; | |
952 | struct typec_altmode_desc *paltmode; | |
953 | struct typec_mode_desc *pmode; | |
954 | int i; | |
955 | ||
956 | if (pmdata->altmodes >= ARRAY_SIZE(port->partner_altmode)) { | |
957 | /* Already logged in svdm_consume_svids() */ | |
958 | return; | |
959 | } | |
960 | ||
961 | paltmode = &pmdata->altmode_desc[pmdata->altmodes]; | |
962 | memset(paltmode, 0, sizeof(*paltmode)); | |
963 | ||
964 | paltmode->svid = pmdata->svids[pmdata->svid_index]; | |
965 | ||
966 | tcpm_log(port, " Alternate mode %d: SVID 0x%04x", | |
967 | pmdata->altmodes, paltmode->svid); | |
968 | ||
969 | for (i = 1; i < cnt && paltmode->n_modes < ALTMODE_MAX_MODES; i++) { | |
970 | pmode = &paltmode->modes[paltmode->n_modes]; | |
971 | memset(pmode, 0, sizeof(*pmode)); | |
972 | pmode->vdo = le32_to_cpu(payload[i]); | |
973 | pmode->index = i - 1; | |
974 | paltmode->n_modes++; | |
975 | tcpm_log(port, " VDO %d: 0x%08x", | |
976 | pmode->index, pmode->vdo); | |
977 | } | |
978 | port->partner_altmode[pmdata->altmodes] = | |
979 | typec_partner_register_altmode(port->partner, paltmode); | |
4c87b3e5 | 980 | if (!port->partner_altmode[pmdata->altmodes]) { |
f0690a25 GR |
981 | tcpm_log(port, |
982 | "Failed to register alternate modes for SVID 0x%04x", | |
983 | paltmode->svid); | |
984 | return; | |
985 | } | |
986 | pmdata->altmodes++; | |
987 | } | |
988 | ||
989 | #define supports_modal(port) PD_IDH_MODAL_SUPP((port)->partner_ident.id_header) | |
990 | ||
991 | static int tcpm_pd_svdm(struct tcpm_port *port, const __le32 *payload, int cnt, | |
992 | u32 *response) | |
993 | { | |
994 | u32 p0 = le32_to_cpu(payload[0]); | |
995 | int cmd_type = PD_VDO_CMDT(p0); | |
996 | int cmd = PD_VDO_CMD(p0); | |
997 | struct pd_mode_data *modep; | |
998 | int rlen = 0; | |
999 | u16 svid; | |
193a6801 | 1000 | int i; |
f0690a25 GR |
1001 | |
1002 | tcpm_log(port, "Rx VDM cmd 0x%x type %d cmd %d len %d", | |
1003 | p0, cmd_type, cmd, cnt); | |
1004 | ||
1005 | modep = &port->mode_data; | |
1006 | ||
1007 | switch (cmd_type) { | |
1008 | case CMDT_INIT: | |
1009 | switch (cmd) { | |
1010 | case CMD_DISCOVER_IDENT: | |
193a6801 GR |
1011 | /* 6.4.4.3.1: Only respond as UFP (device) */ |
1012 | if (port->data_role == TYPEC_DEVICE && | |
1013 | port->nr_snk_vdo) { | |
1014 | for (i = 0; i < port->nr_snk_vdo; i++) | |
cbe5843e | 1015 | response[i + 1] = port->snk_vdo[i]; |
193a6801 GR |
1016 | rlen = port->nr_snk_vdo + 1; |
1017 | } | |
f0690a25 GR |
1018 | break; |
1019 | case CMD_DISCOVER_SVID: | |
1020 | break; | |
1021 | case CMD_DISCOVER_MODES: | |
1022 | break; | |
1023 | case CMD_ENTER_MODE: | |
1024 | break; | |
1025 | case CMD_EXIT_MODE: | |
1026 | break; | |
1027 | case CMD_ATTENTION: | |
1028 | break; | |
1029 | default: | |
1030 | break; | |
1031 | } | |
1032 | if (rlen >= 1) { | |
1033 | response[0] = p0 | VDO_CMDT(CMDT_RSP_ACK); | |
1034 | } else if (rlen == 0) { | |
1035 | response[0] = p0 | VDO_CMDT(CMDT_RSP_NAK); | |
1036 | rlen = 1; | |
1037 | } else { | |
1038 | response[0] = p0 | VDO_CMDT(CMDT_RSP_BUSY); | |
1039 | rlen = 1; | |
1040 | } | |
1041 | break; | |
1042 | case CMDT_RSP_ACK: | |
1043 | /* silently drop message if we are not connected */ | |
1044 | if (!port->partner) | |
1045 | break; | |
1046 | ||
1047 | switch (cmd) { | |
1048 | case CMD_DISCOVER_IDENT: | |
1049 | /* 6.4.4.3.1 */ | |
1050 | svdm_consume_identity(port, payload, cnt); | |
1051 | response[0] = VDO(USB_SID_PD, 1, CMD_DISCOVER_SVID); | |
1052 | rlen = 1; | |
1053 | break; | |
1054 | case CMD_DISCOVER_SVID: | |
1055 | /* 6.4.4.3.2 */ | |
1056 | if (svdm_consume_svids(port, payload, cnt)) { | |
1057 | response[0] = VDO(USB_SID_PD, 1, | |
1058 | CMD_DISCOVER_SVID); | |
1059 | rlen = 1; | |
1060 | } else if (modep->nsvids && supports_modal(port)) { | |
1061 | response[0] = VDO(modep->svids[0], 1, | |
1062 | CMD_DISCOVER_MODES); | |
1063 | rlen = 1; | |
1064 | } | |
1065 | break; | |
1066 | case CMD_DISCOVER_MODES: | |
1067 | /* 6.4.4.3.3 */ | |
1068 | svdm_consume_modes(port, payload, cnt); | |
1069 | modep->svid_index++; | |
1070 | if (modep->svid_index < modep->nsvids) { | |
1071 | svid = modep->svids[modep->svid_index]; | |
1072 | response[0] = VDO(svid, 1, CMD_DISCOVER_MODES); | |
1073 | rlen = 1; | |
1074 | } else { | |
44262fad | 1075 | /* enter alternate mode if/when implemented */ |
f0690a25 GR |
1076 | } |
1077 | break; | |
1078 | case CMD_ENTER_MODE: | |
1079 | break; | |
1080 | default: | |
1081 | break; | |
1082 | } | |
1083 | break; | |
1084 | default: | |
1085 | break; | |
1086 | } | |
1087 | ||
1088 | return rlen; | |
1089 | } | |
1090 | ||
1091 | static void tcpm_handle_vdm_request(struct tcpm_port *port, | |
1092 | const __le32 *payload, int cnt) | |
1093 | { | |
1094 | int rlen = 0; | |
1095 | u32 response[8] = { }; | |
1096 | u32 p0 = le32_to_cpu(payload[0]); | |
1097 | ||
1098 | if (port->vdm_state == VDM_STATE_BUSY) { | |
1099 | /* If UFP responded busy retry after timeout */ | |
1100 | if (PD_VDO_CMDT(p0) == CMDT_RSP_BUSY) { | |
1101 | port->vdm_state = VDM_STATE_WAIT_RSP_BUSY; | |
1102 | port->vdo_retry = (p0 & ~VDO_CMDT_MASK) | | |
1103 | CMDT_INIT; | |
1104 | mod_delayed_work(port->wq, &port->vdm_state_machine, | |
1105 | msecs_to_jiffies(PD_T_VDM_BUSY)); | |
1106 | return; | |
1107 | } | |
1108 | port->vdm_state = VDM_STATE_DONE; | |
1109 | } | |
1110 | ||
1111 | if (PD_VDO_SVDM(p0)) | |
1112 | rlen = tcpm_pd_svdm(port, payload, cnt, response); | |
f0690a25 GR |
1113 | |
1114 | if (rlen > 0) { | |
1115 | tcpm_queue_vdm(port, response[0], &response[1], rlen - 1); | |
1116 | mod_delayed_work(port->wq, &port->vdm_state_machine, 0); | |
1117 | } | |
1118 | } | |
1119 | ||
1120 | static void tcpm_send_vdm(struct tcpm_port *port, u32 vid, int cmd, | |
1121 | const u32 *data, int count) | |
1122 | { | |
1123 | u32 header; | |
1124 | ||
1125 | if (WARN_ON(count > VDO_MAX_SIZE - 1)) | |
1126 | count = VDO_MAX_SIZE - 1; | |
1127 | ||
1128 | /* set VDM header with VID & CMD */ | |
1129 | header = VDO(vid, ((vid & USB_SID_PD) == USB_SID_PD) ? | |
1130 | 1 : (PD_VDO_CMD(cmd) <= CMD_ATTENTION), cmd); | |
1131 | tcpm_queue_vdm(port, header, data, count); | |
1132 | ||
1133 | mod_delayed_work(port->wq, &port->vdm_state_machine, 0); | |
1134 | } | |
1135 | ||
1136 | static unsigned int vdm_ready_timeout(u32 vdm_hdr) | |
1137 | { | |
1138 | unsigned int timeout; | |
1139 | int cmd = PD_VDO_CMD(vdm_hdr); | |
1140 | ||
1141 | /* its not a structured VDM command */ | |
1142 | if (!PD_VDO_SVDM(vdm_hdr)) | |
1143 | return PD_T_VDM_UNSTRUCTURED; | |
1144 | ||
1145 | switch (PD_VDO_CMDT(vdm_hdr)) { | |
1146 | case CMDT_INIT: | |
1147 | if (cmd == CMD_ENTER_MODE || cmd == CMD_EXIT_MODE) | |
1148 | timeout = PD_T_VDM_WAIT_MODE_E; | |
1149 | else | |
1150 | timeout = PD_T_VDM_SNDR_RSP; | |
1151 | break; | |
1152 | default: | |
1153 | if (cmd == CMD_ENTER_MODE || cmd == CMD_EXIT_MODE) | |
1154 | timeout = PD_T_VDM_E_MODE; | |
1155 | else | |
1156 | timeout = PD_T_VDM_RCVR_RSP; | |
1157 | break; | |
1158 | } | |
1159 | return timeout; | |
1160 | } | |
1161 | ||
1162 | static void vdm_run_state_machine(struct tcpm_port *port) | |
1163 | { | |
1164 | struct pd_message msg; | |
1165 | int i, res; | |
1166 | ||
1167 | switch (port->vdm_state) { | |
1168 | case VDM_STATE_READY: | |
1169 | /* Only transmit VDM if attached */ | |
1170 | if (!port->attached) { | |
1171 | port->vdm_state = VDM_STATE_ERR_BUSY; | |
1172 | break; | |
1173 | } | |
1174 | ||
1175 | /* | |
1176 | * if there's traffic or we're not in PDO ready state don't send | |
1177 | * a VDM. | |
1178 | */ | |
1179 | if (port->state != SRC_READY && port->state != SNK_READY) | |
1180 | break; | |
1181 | ||
1182 | /* Prepare and send VDM */ | |
1183 | memset(&msg, 0, sizeof(msg)); | |
1184 | msg.header = PD_HEADER_LE(PD_DATA_VENDOR_DEF, | |
1185 | port->pwr_role, | |
1186 | port->data_role, | |
1187 | port->message_id, port->vdo_count); | |
1188 | for (i = 0; i < port->vdo_count; i++) | |
1189 | msg.payload[i] = cpu_to_le32(port->vdo_data[i]); | |
1190 | res = tcpm_pd_transmit(port, TCPC_TX_SOP, &msg); | |
1191 | if (res < 0) { | |
1192 | port->vdm_state = VDM_STATE_ERR_SEND; | |
1193 | } else { | |
1194 | unsigned long timeout; | |
1195 | ||
1196 | port->vdm_retries = 0; | |
1197 | port->vdm_state = VDM_STATE_BUSY; | |
1198 | timeout = vdm_ready_timeout(port->vdo_data[0]); | |
1199 | mod_delayed_work(port->wq, &port->vdm_state_machine, | |
1200 | timeout); | |
1201 | } | |
1202 | break; | |
1203 | case VDM_STATE_WAIT_RSP_BUSY: | |
1204 | port->vdo_data[0] = port->vdo_retry; | |
1205 | port->vdo_count = 1; | |
1206 | port->vdm_state = VDM_STATE_READY; | |
1207 | break; | |
1208 | case VDM_STATE_BUSY: | |
1209 | port->vdm_state = VDM_STATE_ERR_TMOUT; | |
1210 | break; | |
1211 | case VDM_STATE_ERR_SEND: | |
1212 | /* | |
1213 | * A partner which does not support USB PD will not reply, | |
1214 | * so this is not a fatal error. At the same time, some | |
1215 | * devices may not return GoodCRC under some circumstances, | |
1216 | * so we need to retry. | |
1217 | */ | |
1218 | if (port->vdm_retries < 3) { | |
1219 | tcpm_log(port, "VDM Tx error, retry"); | |
1220 | port->vdm_retries++; | |
1221 | port->vdm_state = VDM_STATE_READY; | |
1222 | } | |
1223 | break; | |
1224 | default: | |
1225 | break; | |
1226 | } | |
1227 | } | |
1228 | ||
1229 | static void vdm_state_machine_work(struct work_struct *work) | |
1230 | { | |
1231 | struct tcpm_port *port = container_of(work, struct tcpm_port, | |
1232 | vdm_state_machine.work); | |
1233 | enum vdm_states prev_state; | |
1234 | ||
1235 | mutex_lock(&port->lock); | |
1236 | ||
1237 | /* | |
1238 | * Continue running as long as the port is not busy and there was | |
1239 | * a state change. | |
1240 | */ | |
1241 | do { | |
1242 | prev_state = port->vdm_state; | |
1243 | vdm_run_state_machine(port); | |
1244 | } while (port->vdm_state != prev_state && | |
1245 | port->vdm_state != VDM_STATE_BUSY); | |
1246 | ||
1247 | mutex_unlock(&port->lock); | |
1248 | } | |
1249 | ||
5007e1b5 BJS |
1250 | enum pdo_err { |
1251 | PDO_NO_ERR, | |
1252 | PDO_ERR_NO_VSAFE5V, | |
1253 | PDO_ERR_VSAFE5V_NOT_FIRST, | |
1254 | PDO_ERR_PDO_TYPE_NOT_IN_ORDER, | |
1255 | PDO_ERR_FIXED_NOT_SORTED, | |
1256 | PDO_ERR_VARIABLE_BATT_NOT_SORTED, | |
1257 | PDO_ERR_DUPE_PDO, | |
1258 | }; | |
1259 | ||
1260 | static const char * const pdo_err_msg[] = { | |
1261 | [PDO_ERR_NO_VSAFE5V] = | |
1262 | " err: source/sink caps should atleast have vSafe5V", | |
1263 | [PDO_ERR_VSAFE5V_NOT_FIRST] = | |
1264 | " err: vSafe5V Fixed Supply Object Shall always be the first object", | |
1265 | [PDO_ERR_PDO_TYPE_NOT_IN_ORDER] = | |
1266 | " err: PDOs should be in the following order: Fixed; Battery; Variable", | |
1267 | [PDO_ERR_FIXED_NOT_SORTED] = | |
1268 | " err: Fixed supply pdos should be in increasing order of their fixed voltage", | |
1269 | [PDO_ERR_VARIABLE_BATT_NOT_SORTED] = | |
1270 | " err: Variable/Battery supply pdos should be in increasing order of their minimum voltage", | |
1271 | [PDO_ERR_DUPE_PDO] = | |
1272 | " err: Variable/Batt supply pdos cannot have same min/max voltage", | |
1273 | }; | |
1274 | ||
1275 | static enum pdo_err tcpm_caps_err(struct tcpm_port *port, const u32 *pdo, | |
1276 | unsigned int nr_pdo) | |
1277 | { | |
1278 | unsigned int i; | |
1279 | ||
1280 | /* Should at least contain vSafe5v */ | |
1281 | if (nr_pdo < 1) | |
1282 | return PDO_ERR_NO_VSAFE5V; | |
1283 | ||
1284 | /* The vSafe5V Fixed Supply Object Shall always be the first object */ | |
1285 | if (pdo_type(pdo[0]) != PDO_TYPE_FIXED || | |
1286 | pdo_fixed_voltage(pdo[0]) != VSAFE5V) | |
1287 | return PDO_ERR_VSAFE5V_NOT_FIRST; | |
1288 | ||
1289 | for (i = 1; i < nr_pdo; i++) { | |
1290 | if (pdo_type(pdo[i]) < pdo_type(pdo[i - 1])) { | |
1291 | return PDO_ERR_PDO_TYPE_NOT_IN_ORDER; | |
1292 | } else if (pdo_type(pdo[i]) == pdo_type(pdo[i - 1])) { | |
1293 | enum pd_pdo_type type = pdo_type(pdo[i]); | |
1294 | ||
1295 | switch (type) { | |
1296 | /* | |
1297 | * The remaining Fixed Supply Objects, if | |
1298 | * present, shall be sent in voltage order; | |
1299 | * lowest to highest. | |
1300 | */ | |
1301 | case PDO_TYPE_FIXED: | |
1302 | if (pdo_fixed_voltage(pdo[i]) <= | |
1303 | pdo_fixed_voltage(pdo[i - 1])) | |
1304 | return PDO_ERR_FIXED_NOT_SORTED; | |
1305 | break; | |
1306 | /* | |
1307 | * The Battery Supply Objects and Variable | |
1308 | * supply, if present shall be sent in Minimum | |
1309 | * Voltage order; lowest to highest. | |
1310 | */ | |
1311 | case PDO_TYPE_VAR: | |
1312 | case PDO_TYPE_BATT: | |
1313 | if (pdo_min_voltage(pdo[i]) < | |
1314 | pdo_min_voltage(pdo[i - 1])) | |
1315 | return PDO_ERR_VARIABLE_BATT_NOT_SORTED; | |
1316 | else if ((pdo_min_voltage(pdo[i]) == | |
1317 | pdo_min_voltage(pdo[i - 1])) && | |
1318 | (pdo_max_voltage(pdo[i]) == | |
1319 | pdo_min_voltage(pdo[i - 1]))) | |
1320 | return PDO_ERR_DUPE_PDO; | |
1321 | break; | |
1322 | default: | |
1323 | tcpm_log_force(port, " Unknown pdo type"); | |
1324 | } | |
1325 | } | |
1326 | } | |
1327 | ||
1328 | return PDO_NO_ERR; | |
1329 | } | |
1330 | ||
1331 | static int tcpm_validate_caps(struct tcpm_port *port, const u32 *pdo, | |
1332 | unsigned int nr_pdo) | |
1333 | { | |
1334 | enum pdo_err err_index = tcpm_caps_err(port, pdo, nr_pdo); | |
1335 | ||
1336 | if (err_index != PDO_NO_ERR) { | |
1337 | tcpm_log_force(port, " %s", pdo_err_msg[err_index]); | |
1338 | return -EINVAL; | |
1339 | } | |
1340 | ||
1341 | return 0; | |
1342 | } | |
1343 | ||
f0690a25 GR |
1344 | /* |
1345 | * PD (data, control) command handling functions | |
1346 | */ | |
1347 | static void tcpm_pd_data_request(struct tcpm_port *port, | |
1348 | const struct pd_message *msg) | |
1349 | { | |
1350 | enum pd_data_msg_type type = pd_header_type_le(msg->header); | |
1351 | unsigned int cnt = pd_header_cnt_le(msg->header); | |
1352 | unsigned int i; | |
1353 | ||
1354 | switch (type) { | |
1355 | case PD_DATA_SOURCE_CAP: | |
1356 | if (port->pwr_role != TYPEC_SINK) | |
1357 | break; | |
1358 | ||
1359 | for (i = 0; i < cnt; i++) | |
1360 | port->source_caps[i] = le32_to_cpu(msg->payload[i]); | |
1361 | ||
1362 | port->nr_source_caps = cnt; | |
1363 | ||
1364 | tcpm_log_source_caps(port); | |
1365 | ||
5007e1b5 BJS |
1366 | tcpm_validate_caps(port, port->source_caps, |
1367 | port->nr_source_caps); | |
1368 | ||
f0690a25 GR |
1369 | /* |
1370 | * This message may be received even if VBUS is not | |
1371 | * present. This is quite unexpected; see USB PD | |
1372 | * specification, sections 8.3.3.6.3.1 and 8.3.3.6.3.2. | |
1373 | * However, at the same time, we must be ready to | |
1374 | * receive this message and respond to it 15ms after | |
1375 | * receiving PS_RDY during power swap operations, no matter | |
1376 | * if VBUS is available or not (USB PD specification, | |
1377 | * section 6.5.9.2). | |
1378 | * So we need to accept the message either way, | |
1379 | * but be prepared to keep waiting for VBUS after it was | |
1380 | * handled. | |
1381 | */ | |
1382 | tcpm_set_state(port, SNK_NEGOTIATE_CAPABILITIES, 0); | |
1383 | break; | |
1384 | case PD_DATA_REQUEST: | |
1385 | if (port->pwr_role != TYPEC_SOURCE || | |
1386 | cnt != 1) { | |
1387 | tcpm_queue_message(port, PD_MSG_CTRL_REJECT); | |
1388 | break; | |
1389 | } | |
1390 | port->sink_request = le32_to_cpu(msg->payload[0]); | |
1391 | tcpm_set_state(port, SRC_NEGOTIATE_CAPABILITIES, 0); | |
1392 | break; | |
1393 | case PD_DATA_SINK_CAP: | |
1394 | /* We don't do anything with this at the moment... */ | |
1395 | for (i = 0; i < cnt; i++) | |
1396 | port->sink_caps[i] = le32_to_cpu(msg->payload[i]); | |
1397 | port->nr_sink_caps = cnt; | |
1398 | break; | |
1399 | case PD_DATA_VENDOR_DEF: | |
1400 | tcpm_handle_vdm_request(port, msg->payload, cnt); | |
1401 | break; | |
1402 | case PD_DATA_BIST: | |
1403 | if (port->state == SRC_READY || port->state == SNK_READY) { | |
1404 | port->bist_request = le32_to_cpu(msg->payload[0]); | |
1405 | tcpm_set_state(port, BIST_RX, 0); | |
1406 | } | |
1407 | break; | |
1408 | default: | |
1409 | tcpm_log(port, "Unhandled data message type %#x", type); | |
1410 | break; | |
1411 | } | |
1412 | } | |
1413 | ||
1414 | static void tcpm_pd_ctrl_request(struct tcpm_port *port, | |
1415 | const struct pd_message *msg) | |
1416 | { | |
1417 | enum pd_ctrl_msg_type type = pd_header_type_le(msg->header); | |
1418 | enum tcpm_state next_state; | |
1419 | ||
1420 | switch (type) { | |
1421 | case PD_CTRL_GOOD_CRC: | |
1422 | case PD_CTRL_PING: | |
1423 | break; | |
1424 | case PD_CTRL_GET_SOURCE_CAP: | |
1425 | switch (port->state) { | |
1426 | case SRC_READY: | |
1427 | case SNK_READY: | |
1428 | tcpm_queue_message(port, PD_MSG_DATA_SOURCE_CAP); | |
1429 | break; | |
1430 | default: | |
1431 | tcpm_queue_message(port, PD_MSG_CTRL_REJECT); | |
1432 | break; | |
1433 | } | |
1434 | break; | |
1435 | case PD_CTRL_GET_SINK_CAP: | |
1436 | switch (port->state) { | |
1437 | case SRC_READY: | |
1438 | case SNK_READY: | |
1439 | tcpm_queue_message(port, PD_MSG_DATA_SINK_CAP); | |
1440 | break; | |
1441 | default: | |
1442 | tcpm_queue_message(port, PD_MSG_CTRL_REJECT); | |
1443 | break; | |
1444 | } | |
1445 | break; | |
1446 | case PD_CTRL_GOTO_MIN: | |
1447 | break; | |
1448 | case PD_CTRL_PS_RDY: | |
1449 | switch (port->state) { | |
1450 | case SNK_TRANSITION_SINK: | |
1451 | if (port->vbus_present) { | |
1452 | tcpm_set_current_limit(port, | |
1453 | port->current_limit, | |
1454 | port->supply_voltage); | |
8bf05746 | 1455 | port->explicit_contract = true; |
f0690a25 GR |
1456 | tcpm_set_state(port, SNK_READY, 0); |
1457 | } else { | |
1458 | /* | |
1459 | * Seen after power swap. Keep waiting for VBUS | |
1460 | * in a transitional state. | |
1461 | */ | |
1462 | tcpm_set_state(port, | |
1463 | SNK_TRANSITION_SINK_VBUS, 0); | |
1464 | } | |
1465 | break; | |
b965b631 | 1466 | case PR_SWAP_SRC_SNK_SOURCE_OFF_CC_DEBOUNCED: |
f0690a25 GR |
1467 | tcpm_set_state(port, PR_SWAP_SRC_SNK_SINK_ON, 0); |
1468 | break; | |
1469 | case PR_SWAP_SNK_SRC_SINK_OFF: | |
1470 | tcpm_set_state(port, PR_SWAP_SNK_SRC_SOURCE_ON, 0); | |
1471 | break; | |
1472 | case VCONN_SWAP_WAIT_FOR_VCONN: | |
1473 | tcpm_set_state(port, VCONN_SWAP_TURN_OFF_VCONN, 0); | |
1474 | break; | |
1475 | default: | |
1476 | break; | |
1477 | } | |
1478 | break; | |
1479 | case PD_CTRL_REJECT: | |
1480 | case PD_CTRL_WAIT: | |
1481 | switch (port->state) { | |
1482 | case SNK_NEGOTIATE_CAPABILITIES: | |
1483 | /* USB PD specification, Figure 8-43 */ | |
1484 | if (port->explicit_contract) | |
1485 | next_state = SNK_READY; | |
1486 | else | |
1487 | next_state = SNK_WAIT_CAPABILITIES; | |
1488 | tcpm_set_state(port, next_state, 0); | |
1489 | break; | |
1490 | case DR_SWAP_SEND: | |
1491 | port->swap_status = (type == PD_CTRL_WAIT ? | |
1492 | -EAGAIN : -EOPNOTSUPP); | |
1493 | tcpm_set_state(port, DR_SWAP_CANCEL, 0); | |
1494 | break; | |
1495 | case PR_SWAP_SEND: | |
1496 | port->swap_status = (type == PD_CTRL_WAIT ? | |
1497 | -EAGAIN : -EOPNOTSUPP); | |
1498 | tcpm_set_state(port, PR_SWAP_CANCEL, 0); | |
1499 | break; | |
1500 | case VCONN_SWAP_SEND: | |
1501 | port->swap_status = (type == PD_CTRL_WAIT ? | |
1502 | -EAGAIN : -EOPNOTSUPP); | |
1503 | tcpm_set_state(port, VCONN_SWAP_CANCEL, 0); | |
1504 | break; | |
1505 | default: | |
1506 | break; | |
1507 | } | |
1508 | break; | |
1509 | case PD_CTRL_ACCEPT: | |
1510 | switch (port->state) { | |
1511 | case SNK_NEGOTIATE_CAPABILITIES: | |
1512 | tcpm_set_state(port, SNK_TRANSITION_SINK, 0); | |
1513 | break; | |
1514 | case SOFT_RESET_SEND: | |
1515 | port->message_id = 0; | |
5fec4b54 | 1516 | port->rx_msgid = -1; |
f0690a25 GR |
1517 | if (port->pwr_role == TYPEC_SOURCE) |
1518 | next_state = SRC_SEND_CAPABILITIES; | |
1519 | else | |
1520 | next_state = SNK_WAIT_CAPABILITIES; | |
1521 | tcpm_set_state(port, next_state, 0); | |
1522 | break; | |
1523 | case DR_SWAP_SEND: | |
1524 | tcpm_set_state(port, DR_SWAP_CHANGE_DR, 0); | |
1525 | break; | |
1526 | case PR_SWAP_SEND: | |
1527 | tcpm_set_state(port, PR_SWAP_START, 0); | |
1528 | break; | |
1529 | case VCONN_SWAP_SEND: | |
1530 | tcpm_set_state(port, VCONN_SWAP_START, 0); | |
1531 | break; | |
1532 | default: | |
1533 | break; | |
1534 | } | |
1535 | break; | |
1536 | case PD_CTRL_SOFT_RESET: | |
1537 | tcpm_set_state(port, SOFT_RESET, 0); | |
1538 | break; | |
1539 | case PD_CTRL_DR_SWAP: | |
9b0ae699 | 1540 | if (port->port_type != TYPEC_PORT_DRP) { |
f0690a25 GR |
1541 | tcpm_queue_message(port, PD_MSG_CTRL_REJECT); |
1542 | break; | |
1543 | } | |
1544 | /* | |
1545 | * XXX | |
1546 | * 6.3.9: If an alternate mode is active, a request to swap | |
1547 | * alternate modes shall trigger a port reset. | |
1548 | */ | |
1549 | switch (port->state) { | |
1550 | case SRC_READY: | |
1551 | case SNK_READY: | |
1552 | tcpm_set_state(port, DR_SWAP_ACCEPT, 0); | |
1553 | break; | |
1554 | default: | |
1555 | tcpm_queue_message(port, PD_MSG_CTRL_WAIT); | |
1556 | break; | |
1557 | } | |
1558 | break; | |
1559 | case PD_CTRL_PR_SWAP: | |
9b0ae699 | 1560 | if (port->port_type != TYPEC_PORT_DRP) { |
f0690a25 GR |
1561 | tcpm_queue_message(port, PD_MSG_CTRL_REJECT); |
1562 | break; | |
1563 | } | |
1564 | switch (port->state) { | |
1565 | case SRC_READY: | |
1566 | case SNK_READY: | |
1567 | tcpm_set_state(port, PR_SWAP_ACCEPT, 0); | |
1568 | break; | |
1569 | default: | |
1570 | tcpm_queue_message(port, PD_MSG_CTRL_WAIT); | |
1571 | break; | |
1572 | } | |
1573 | break; | |
1574 | case PD_CTRL_VCONN_SWAP: | |
1575 | switch (port->state) { | |
1576 | case SRC_READY: | |
1577 | case SNK_READY: | |
1578 | tcpm_set_state(port, VCONN_SWAP_ACCEPT, 0); | |
1579 | break; | |
1580 | default: | |
1581 | tcpm_queue_message(port, PD_MSG_CTRL_WAIT); | |
1582 | break; | |
1583 | } | |
1584 | break; | |
1585 | default: | |
1586 | tcpm_log(port, "Unhandled ctrl message type %#x", type); | |
1587 | break; | |
1588 | } | |
1589 | } | |
1590 | ||
1591 | static void tcpm_pd_rx_handler(struct work_struct *work) | |
1592 | { | |
1593 | struct pd_rx_event *event = container_of(work, | |
1594 | struct pd_rx_event, work); | |
1595 | const struct pd_message *msg = &event->msg; | |
1596 | unsigned int cnt = pd_header_cnt_le(msg->header); | |
1597 | struct tcpm_port *port = event->port; | |
1598 | ||
1599 | mutex_lock(&port->lock); | |
1600 | ||
1601 | tcpm_log(port, "PD RX, header: %#x [%d]", le16_to_cpu(msg->header), | |
1602 | port->attached); | |
1603 | ||
1604 | if (port->attached) { | |
5fec4b54 GR |
1605 | enum pd_ctrl_msg_type type = pd_header_type_le(msg->header); |
1606 | unsigned int msgid = pd_header_msgid_le(msg->header); | |
1607 | ||
1608 | /* | |
1609 | * USB PD standard, 6.6.1.2: | |
1610 | * "... if MessageID value in a received Message is the | |
1611 | * same as the stored value, the receiver shall return a | |
1612 | * GoodCRC Message with that MessageID value and drop | |
1613 | * the Message (this is a retry of an already received | |
1614 | * Message). Note: this shall not apply to the Soft_Reset | |
1615 | * Message which always has a MessageID value of zero." | |
1616 | */ | |
1617 | if (msgid == port->rx_msgid && type != PD_CTRL_SOFT_RESET) | |
1618 | goto done; | |
1619 | port->rx_msgid = msgid; | |
1620 | ||
f0690a25 GR |
1621 | /* |
1622 | * If both ends believe to be DFP/host, we have a data role | |
1623 | * mismatch. | |
1624 | */ | |
1625 | if (!!(le16_to_cpu(msg->header) & PD_HEADER_DATA_ROLE) == | |
1626 | (port->data_role == TYPEC_HOST)) { | |
1627 | tcpm_log(port, | |
1628 | "Data role mismatch, initiating error recovery"); | |
1629 | tcpm_set_state(port, ERROR_RECOVERY, 0); | |
1630 | } else { | |
1631 | if (cnt) | |
1632 | tcpm_pd_data_request(port, msg); | |
1633 | else | |
1634 | tcpm_pd_ctrl_request(port, msg); | |
1635 | } | |
1636 | } | |
1637 | ||
5fec4b54 | 1638 | done: |
f0690a25 GR |
1639 | mutex_unlock(&port->lock); |
1640 | kfree(event); | |
1641 | } | |
1642 | ||
1643 | void tcpm_pd_receive(struct tcpm_port *port, const struct pd_message *msg) | |
1644 | { | |
1645 | struct pd_rx_event *event; | |
1646 | ||
1647 | event = kzalloc(sizeof(*event), GFP_ATOMIC); | |
1648 | if (!event) | |
1649 | return; | |
1650 | ||
1651 | INIT_WORK(&event->work, tcpm_pd_rx_handler); | |
1652 | event->port = port; | |
1653 | memcpy(&event->msg, msg, sizeof(*msg)); | |
1654 | queue_work(port->wq, &event->work); | |
1655 | } | |
1656 | EXPORT_SYMBOL_GPL(tcpm_pd_receive); | |
1657 | ||
1658 | static int tcpm_pd_send_control(struct tcpm_port *port, | |
1659 | enum pd_ctrl_msg_type type) | |
1660 | { | |
1661 | struct pd_message msg; | |
1662 | ||
1663 | memset(&msg, 0, sizeof(msg)); | |
1664 | msg.header = PD_HEADER_LE(type, port->pwr_role, | |
1665 | port->data_role, | |
1666 | port->message_id, 0); | |
1667 | ||
1668 | return tcpm_pd_transmit(port, TCPC_TX_SOP, &msg); | |
1669 | } | |
1670 | ||
1671 | /* | |
1672 | * Send queued message without affecting state. | |
1673 | * Return true if state machine should go back to sleep, | |
1674 | * false otherwise. | |
1675 | */ | |
1676 | static bool tcpm_send_queued_message(struct tcpm_port *port) | |
1677 | { | |
1678 | enum pd_msg_request queued_message; | |
1679 | ||
1680 | do { | |
1681 | queued_message = port->queued_message; | |
1682 | port->queued_message = PD_MSG_NONE; | |
1683 | ||
1684 | switch (queued_message) { | |
1685 | case PD_MSG_CTRL_WAIT: | |
1686 | tcpm_pd_send_control(port, PD_CTRL_WAIT); | |
1687 | break; | |
1688 | case PD_MSG_CTRL_REJECT: | |
1689 | tcpm_pd_send_control(port, PD_CTRL_REJECT); | |
1690 | break; | |
1691 | case PD_MSG_DATA_SINK_CAP: | |
1692 | tcpm_pd_send_sink_caps(port); | |
1693 | break; | |
1694 | case PD_MSG_DATA_SOURCE_CAP: | |
1695 | tcpm_pd_send_source_caps(port); | |
1696 | break; | |
1697 | default: | |
1698 | break; | |
1699 | } | |
1700 | } while (port->queued_message != PD_MSG_NONE); | |
1701 | ||
1702 | if (port->delayed_state != INVALID_STATE) { | |
1703 | if (time_is_after_jiffies(port->delayed_runtime)) { | |
1704 | mod_delayed_work(port->wq, &port->state_machine, | |
1705 | port->delayed_runtime - jiffies); | |
1706 | return true; | |
1707 | } | |
1708 | port->delayed_state = INVALID_STATE; | |
1709 | } | |
1710 | return false; | |
1711 | } | |
1712 | ||
1713 | static int tcpm_pd_check_request(struct tcpm_port *port) | |
1714 | { | |
1715 | u32 pdo, rdo = port->sink_request; | |
1716 | unsigned int max, op, pdo_max, index; | |
1717 | enum pd_pdo_type type; | |
1718 | ||
1719 | index = rdo_index(rdo); | |
1720 | if (!index || index > port->nr_src_pdo) | |
1721 | return -EINVAL; | |
1722 | ||
1723 | pdo = port->src_pdo[index - 1]; | |
1724 | type = pdo_type(pdo); | |
1725 | switch (type) { | |
1726 | case PDO_TYPE_FIXED: | |
1727 | case PDO_TYPE_VAR: | |
1728 | max = rdo_max_current(rdo); | |
1729 | op = rdo_op_current(rdo); | |
1730 | pdo_max = pdo_max_current(pdo); | |
1731 | ||
1732 | if (op > pdo_max) | |
1733 | return -EINVAL; | |
1734 | if (max > pdo_max && !(rdo & RDO_CAP_MISMATCH)) | |
1735 | return -EINVAL; | |
1736 | ||
1737 | if (type == PDO_TYPE_FIXED) | |
1738 | tcpm_log(port, | |
1739 | "Requested %u mV, %u mA for %u / %u mA", | |
1740 | pdo_fixed_voltage(pdo), pdo_max, op, max); | |
1741 | else | |
1742 | tcpm_log(port, | |
1743 | "Requested %u -> %u mV, %u mA for %u / %u mA", | |
1744 | pdo_min_voltage(pdo), pdo_max_voltage(pdo), | |
1745 | pdo_max, op, max); | |
1746 | break; | |
1747 | case PDO_TYPE_BATT: | |
1748 | max = rdo_max_power(rdo); | |
1749 | op = rdo_op_power(rdo); | |
1750 | pdo_max = pdo_max_power(pdo); | |
1751 | ||
1752 | if (op > pdo_max) | |
1753 | return -EINVAL; | |
1754 | if (max > pdo_max && !(rdo & RDO_CAP_MISMATCH)) | |
1755 | return -EINVAL; | |
1756 | tcpm_log(port, | |
1757 | "Requested %u -> %u mV, %u mW for %u / %u mW", | |
1758 | pdo_min_voltage(pdo), pdo_max_voltage(pdo), | |
1759 | pdo_max, op, max); | |
1760 | break; | |
1761 | default: | |
1762 | return -EINVAL; | |
1763 | } | |
1764 | ||
1765 | port->op_vsafe5v = index == 1; | |
1766 | ||
1767 | return 0; | |
1768 | } | |
1769 | ||
6f566af3 | 1770 | static int tcpm_pd_select_pdo(struct tcpm_port *port) |
f0690a25 | 1771 | { |
6f566af3 | 1772 | unsigned int i, max_mw = 0, max_mv = 0; |
f0690a25 GR |
1773 | int ret = -EINVAL; |
1774 | ||
1775 | /* | |
6f566af3 HG |
1776 | * Select the source PDO providing the most power while staying within |
1777 | * the board's voltage limits. Prefer PDO providing exp | |
f0690a25 GR |
1778 | */ |
1779 | for (i = 0; i < port->nr_source_caps; i++) { | |
1780 | u32 pdo = port->source_caps[i]; | |
1781 | enum pd_pdo_type type = pdo_type(pdo); | |
6f566af3 | 1782 | unsigned int mv, ma, mw; |
f0690a25 | 1783 | |
6f566af3 HG |
1784 | if (type == PDO_TYPE_FIXED) |
1785 | mv = pdo_fixed_voltage(pdo); | |
1786 | else | |
1787 | mv = pdo_min_voltage(pdo); | |
1788 | ||
1789 | if (type == PDO_TYPE_BATT) { | |
1790 | mw = pdo_max_power(pdo); | |
1791 | } else { | |
1792 | ma = min(pdo_max_current(pdo), | |
1793 | port->max_snk_ma); | |
1794 | mw = ma * mv / 1000; | |
1795 | } | |
1796 | ||
1797 | /* Perfer higher voltages if available */ | |
1798 | if ((mw > max_mw || (mw == max_mw && mv > max_mv)) && | |
1799 | mv <= port->max_snk_mv) { | |
1800 | ret = i; | |
1801 | max_mw = mw; | |
1802 | max_mv = mv; | |
f0690a25 GR |
1803 | } |
1804 | } | |
1805 | ||
1806 | return ret; | |
1807 | } | |
1808 | ||
1809 | static int tcpm_pd_build_request(struct tcpm_port *port, u32 *rdo) | |
1810 | { | |
1811 | unsigned int mv, ma, mw, flags; | |
1812 | unsigned int max_ma, max_mw; | |
1813 | enum pd_pdo_type type; | |
6f566af3 HG |
1814 | int index; |
1815 | u32 pdo; | |
f0690a25 | 1816 | |
6f566af3 HG |
1817 | index = tcpm_pd_select_pdo(port); |
1818 | if (index < 0) | |
f0690a25 | 1819 | return -EINVAL; |
6f566af3 | 1820 | pdo = port->source_caps[index]; |
f0690a25 GR |
1821 | type = pdo_type(pdo); |
1822 | ||
1823 | if (type == PDO_TYPE_FIXED) | |
1824 | mv = pdo_fixed_voltage(pdo); | |
1825 | else | |
1826 | mv = pdo_min_voltage(pdo); | |
1827 | ||
6f566af3 | 1828 | /* Select maximum available current within the board's power limit */ |
f0690a25 | 1829 | if (type == PDO_TYPE_BATT) { |
6f566af3 HG |
1830 | mw = pdo_max_power(pdo); |
1831 | ma = 1000 * min(mw, port->max_snk_mw) / mv; | |
f0690a25 | 1832 | } else { |
6f566af3 HG |
1833 | ma = min(pdo_max_current(pdo), |
1834 | 1000 * port->max_snk_mw / mv); | |
f0690a25 | 1835 | } |
6f566af3 | 1836 | ma = min(ma, port->max_snk_ma); |
f0690a25 | 1837 | |
931693f9 | 1838 | flags = RDO_USB_COMM | RDO_NO_SUSPEND; |
f0690a25 GR |
1839 | |
1840 | /* Set mismatch bit if offered power is less than operating power */ | |
6f566af3 | 1841 | mw = ma * mv / 1000; |
f0690a25 GR |
1842 | max_ma = ma; |
1843 | max_mw = mw; | |
1844 | if (mw < port->operating_snk_mw) { | |
1845 | flags |= RDO_CAP_MISMATCH; | |
6f566af3 HG |
1846 | max_mw = port->operating_snk_mw; |
1847 | max_ma = max_mw * 1000 / mv; | |
f0690a25 GR |
1848 | } |
1849 | ||
1850 | tcpm_log(port, "cc=%d cc1=%d cc2=%d vbus=%d vconn=%s polarity=%d", | |
1851 | port->cc_req, port->cc1, port->cc2, port->vbus_source, | |
1852 | port->vconn_role == TYPEC_SOURCE ? "source" : "sink", | |
1853 | port->polarity); | |
1854 | ||
1855 | if (type == PDO_TYPE_BATT) { | |
6f566af3 | 1856 | *rdo = RDO_BATT(index + 1, mw, max_mw, flags); |
f0690a25 GR |
1857 | |
1858 | tcpm_log(port, "Requesting PDO %d: %u mV, %u mW%s", | |
6f566af3 | 1859 | index, mv, mw, |
f0690a25 GR |
1860 | flags & RDO_CAP_MISMATCH ? " [mismatch]" : ""); |
1861 | } else { | |
6f566af3 | 1862 | *rdo = RDO_FIXED(index + 1, ma, max_ma, flags); |
f0690a25 GR |
1863 | |
1864 | tcpm_log(port, "Requesting PDO %d: %u mV, %u mA%s", | |
6f566af3 | 1865 | index, mv, ma, |
f0690a25 GR |
1866 | flags & RDO_CAP_MISMATCH ? " [mismatch]" : ""); |
1867 | } | |
1868 | ||
1869 | port->current_limit = ma; | |
1870 | port->supply_voltage = mv; | |
1871 | ||
1872 | return 0; | |
1873 | } | |
1874 | ||
1875 | static int tcpm_pd_send_request(struct tcpm_port *port) | |
1876 | { | |
1877 | struct pd_message msg; | |
1878 | int ret; | |
1879 | u32 rdo; | |
1880 | ||
1881 | ret = tcpm_pd_build_request(port, &rdo); | |
1882 | if (ret < 0) | |
1883 | return ret; | |
1884 | ||
1885 | memset(&msg, 0, sizeof(msg)); | |
1886 | msg.header = PD_HEADER_LE(PD_DATA_REQUEST, | |
1887 | port->pwr_role, | |
1888 | port->data_role, | |
1889 | port->message_id, 1); | |
1890 | msg.payload[0] = cpu_to_le32(rdo); | |
1891 | ||
1892 | return tcpm_pd_transmit(port, TCPC_TX_SOP, &msg); | |
1893 | } | |
1894 | ||
1895 | static int tcpm_set_vbus(struct tcpm_port *port, bool enable) | |
1896 | { | |
1897 | int ret; | |
1898 | ||
1899 | if (enable && port->vbus_charge) | |
1900 | return -EINVAL; | |
1901 | ||
1902 | tcpm_log(port, "vbus:=%d charge=%d", enable, port->vbus_charge); | |
1903 | ||
1904 | ret = port->tcpc->set_vbus(port->tcpc, enable, port->vbus_charge); | |
1905 | if (ret < 0) | |
1906 | return ret; | |
1907 | ||
1908 | port->vbus_source = enable; | |
1909 | return 0; | |
1910 | } | |
1911 | ||
1912 | static int tcpm_set_charge(struct tcpm_port *port, bool charge) | |
1913 | { | |
1914 | int ret; | |
1915 | ||
1916 | if (charge && port->vbus_source) | |
1917 | return -EINVAL; | |
1918 | ||
1919 | if (charge != port->vbus_charge) { | |
1920 | tcpm_log(port, "vbus=%d charge:=%d", port->vbus_source, charge); | |
1921 | ret = port->tcpc->set_vbus(port->tcpc, port->vbus_source, | |
1922 | charge); | |
1923 | if (ret < 0) | |
1924 | return ret; | |
1925 | } | |
1926 | port->vbus_charge = charge; | |
1927 | return 0; | |
1928 | } | |
1929 | ||
1930 | static bool tcpm_start_drp_toggling(struct tcpm_port *port) | |
1931 | { | |
1932 | int ret; | |
1933 | ||
1934 | if (port->tcpc->start_drp_toggling && | |
9b0ae699 | 1935 | port->port_type == TYPEC_PORT_DRP) { |
f0690a25 GR |
1936 | tcpm_log_force(port, "Start DRP toggling"); |
1937 | ret = port->tcpc->start_drp_toggling(port->tcpc, | |
1938 | tcpm_rp_cc(port)); | |
1939 | if (!ret) | |
1940 | return true; | |
1941 | } | |
1942 | ||
1943 | return false; | |
1944 | } | |
1945 | ||
1946 | static void tcpm_set_cc(struct tcpm_port *port, enum typec_cc_status cc) | |
1947 | { | |
1948 | tcpm_log(port, "cc:=%d", cc); | |
1949 | port->cc_req = cc; | |
1950 | port->tcpc->set_cc(port->tcpc, cc); | |
1951 | } | |
1952 | ||
1953 | static int tcpm_init_vbus(struct tcpm_port *port) | |
1954 | { | |
1955 | int ret; | |
1956 | ||
1957 | ret = port->tcpc->set_vbus(port->tcpc, false, false); | |
1958 | port->vbus_source = false; | |
1959 | port->vbus_charge = false; | |
1960 | return ret; | |
1961 | } | |
1962 | ||
1963 | static int tcpm_init_vconn(struct tcpm_port *port) | |
1964 | { | |
1965 | int ret; | |
1966 | ||
1967 | ret = port->tcpc->set_vconn(port->tcpc, false); | |
1968 | port->vconn_role = TYPEC_SINK; | |
1969 | return ret; | |
1970 | } | |
1971 | ||
1972 | static void tcpm_typec_connect(struct tcpm_port *port) | |
1973 | { | |
1974 | if (!port->connected) { | |
1975 | /* Make sure we don't report stale identity information */ | |
1976 | memset(&port->partner_ident, 0, sizeof(port->partner_ident)); | |
1977 | port->partner_desc.usb_pd = port->pd_capable; | |
1978 | if (tcpm_port_is_debug(port)) | |
1979 | port->partner_desc.accessory = TYPEC_ACCESSORY_DEBUG; | |
1980 | else if (tcpm_port_is_audio(port)) | |
1981 | port->partner_desc.accessory = TYPEC_ACCESSORY_AUDIO; | |
1982 | else | |
1983 | port->partner_desc.accessory = TYPEC_ACCESSORY_NONE; | |
1984 | port->partner = typec_register_partner(port->typec_port, | |
1985 | &port->partner_desc); | |
1986 | port->connected = true; | |
1987 | } | |
1988 | } | |
1989 | ||
1990 | static int tcpm_src_attach(struct tcpm_port *port) | |
1991 | { | |
1992 | enum typec_cc_polarity polarity = | |
1993 | port->cc2 == TYPEC_CC_RD ? TYPEC_POLARITY_CC2 | |
1994 | : TYPEC_POLARITY_CC1; | |
1995 | int ret; | |
1996 | ||
1997 | if (port->attached) | |
1998 | return 0; | |
1999 | ||
2000 | ret = tcpm_set_polarity(port, polarity); | |
2001 | if (ret < 0) | |
2002 | return ret; | |
2003 | ||
2004 | ret = tcpm_set_roles(port, true, TYPEC_SOURCE, TYPEC_HOST); | |
2005 | if (ret < 0) | |
2006 | return ret; | |
2007 | ||
2008 | ret = port->tcpc->set_pd_rx(port->tcpc, true); | |
2009 | if (ret < 0) | |
2010 | goto out_disable_mux; | |
2011 | ||
2012 | /* | |
2013 | * USB Type-C specification, version 1.2, | |
2014 | * chapter 4.5.2.2.8.1 (Attached.SRC Requirements) | |
2015 | * Enable VCONN only if the non-RD port is set to RA. | |
2016 | */ | |
2017 | if ((polarity == TYPEC_POLARITY_CC1 && port->cc2 == TYPEC_CC_RA) || | |
2018 | (polarity == TYPEC_POLARITY_CC2 && port->cc1 == TYPEC_CC_RA)) { | |
2019 | ret = tcpm_set_vconn(port, true); | |
2020 | if (ret < 0) | |
2021 | goto out_disable_pd; | |
2022 | } | |
2023 | ||
2024 | ret = tcpm_set_vbus(port, true); | |
2025 | if (ret < 0) | |
2026 | goto out_disable_vconn; | |
2027 | ||
2028 | port->pd_capable = false; | |
2029 | ||
2030 | port->partner = NULL; | |
2031 | ||
2032 | port->attached = true; | |
2033 | port->send_discover = true; | |
2034 | ||
2035 | return 0; | |
2036 | ||
2037 | out_disable_vconn: | |
2038 | tcpm_set_vconn(port, false); | |
2039 | out_disable_pd: | |
2040 | port->tcpc->set_pd_rx(port->tcpc, false); | |
2041 | out_disable_mux: | |
2042 | tcpm_mux_set(port, TYPEC_MUX_NONE, TCPC_USB_SWITCH_DISCONNECT); | |
2043 | return ret; | |
2044 | } | |
2045 | ||
2046 | static void tcpm_typec_disconnect(struct tcpm_port *port) | |
2047 | { | |
2048 | if (port->connected) { | |
2049 | typec_unregister_partner(port->partner); | |
2050 | port->partner = NULL; | |
2051 | port->connected = false; | |
2052 | } | |
2053 | } | |
2054 | ||
2055 | static void tcpm_unregister_altmodes(struct tcpm_port *port) | |
2056 | { | |
2057 | struct pd_mode_data *modep = &port->mode_data; | |
2058 | int i; | |
2059 | ||
2060 | for (i = 0; i < modep->altmodes; i++) { | |
2061 | typec_unregister_altmode(port->partner_altmode[i]); | |
2062 | port->partner_altmode[i] = NULL; | |
2063 | } | |
2064 | ||
2065 | memset(modep, 0, sizeof(*modep)); | |
2066 | } | |
2067 | ||
2068 | static void tcpm_reset_port(struct tcpm_port *port) | |
2069 | { | |
2070 | tcpm_unregister_altmodes(port); | |
2071 | tcpm_typec_disconnect(port); | |
2072 | port->attached = false; | |
2073 | port->pd_capable = false; | |
2074 | ||
5fec4b54 GR |
2075 | /* |
2076 | * First Rx ID should be 0; set this to a sentinel of -1 so that | |
2077 | * we can check tcpm_pd_rx_handler() if we had seen it before. | |
2078 | */ | |
2079 | port->rx_msgid = -1; | |
2080 | ||
f0690a25 GR |
2081 | port->tcpc->set_pd_rx(port->tcpc, false); |
2082 | tcpm_init_vbus(port); /* also disables charging */ | |
2083 | tcpm_init_vconn(port); | |
2084 | tcpm_set_current_limit(port, 0, 0); | |
2085 | tcpm_set_polarity(port, TYPEC_POLARITY_CC1); | |
2086 | tcpm_set_attached_state(port, false); | |
2087 | port->try_src_count = 0; | |
2088 | port->try_snk_count = 0; | |
2089 | } | |
2090 | ||
2091 | static void tcpm_detach(struct tcpm_port *port) | |
2092 | { | |
2093 | if (!port->attached) | |
2094 | return; | |
2095 | ||
2096 | if (tcpm_port_is_disconnected(port)) | |
2097 | port->hard_reset_count = 0; | |
2098 | ||
2099 | tcpm_reset_port(port); | |
2100 | } | |
2101 | ||
2102 | static void tcpm_src_detach(struct tcpm_port *port) | |
2103 | { | |
2104 | tcpm_detach(port); | |
2105 | } | |
2106 | ||
2107 | static int tcpm_snk_attach(struct tcpm_port *port) | |
2108 | { | |
2109 | int ret; | |
2110 | ||
2111 | if (port->attached) | |
2112 | return 0; | |
2113 | ||
2114 | ret = tcpm_set_polarity(port, port->cc2 != TYPEC_CC_OPEN ? | |
2115 | TYPEC_POLARITY_CC2 : TYPEC_POLARITY_CC1); | |
2116 | if (ret < 0) | |
2117 | return ret; | |
2118 | ||
2119 | ret = tcpm_set_roles(port, true, TYPEC_SINK, TYPEC_DEVICE); | |
2120 | if (ret < 0) | |
2121 | return ret; | |
2122 | ||
2123 | port->pd_capable = false; | |
2124 | ||
2125 | port->partner = NULL; | |
2126 | ||
2127 | port->attached = true; | |
2128 | port->send_discover = true; | |
2129 | ||
2130 | return 0; | |
2131 | } | |
2132 | ||
2133 | static void tcpm_snk_detach(struct tcpm_port *port) | |
2134 | { | |
2135 | tcpm_detach(port); | |
2136 | ||
2137 | /* XXX: (Dis)connect SuperSpeed mux? */ | |
2138 | } | |
2139 | ||
2140 | static int tcpm_acc_attach(struct tcpm_port *port) | |
2141 | { | |
2142 | int ret; | |
2143 | ||
2144 | if (port->attached) | |
2145 | return 0; | |
2146 | ||
2147 | ret = tcpm_set_roles(port, true, TYPEC_SOURCE, TYPEC_HOST); | |
2148 | if (ret < 0) | |
2149 | return ret; | |
2150 | ||
2151 | port->partner = NULL; | |
2152 | ||
2153 | tcpm_typec_connect(port); | |
2154 | ||
2155 | port->attached = true; | |
2156 | ||
2157 | return 0; | |
2158 | } | |
2159 | ||
2160 | static void tcpm_acc_detach(struct tcpm_port *port) | |
2161 | { | |
2162 | tcpm_detach(port); | |
2163 | } | |
2164 | ||
2165 | static inline enum tcpm_state hard_reset_state(struct tcpm_port *port) | |
2166 | { | |
2167 | if (port->hard_reset_count < PD_N_HARD_RESET_COUNT) | |
2168 | return HARD_RESET_SEND; | |
2169 | if (port->pd_capable) | |
2170 | return ERROR_RECOVERY; | |
2171 | if (port->pwr_role == TYPEC_SOURCE) | |
2172 | return SRC_UNATTACHED; | |
2173 | if (port->state == SNK_WAIT_CAPABILITIES) | |
2174 | return SNK_READY; | |
2175 | return SNK_UNATTACHED; | |
2176 | } | |
2177 | ||
2178 | static inline enum tcpm_state ready_state(struct tcpm_port *port) | |
2179 | { | |
2180 | if (port->pwr_role == TYPEC_SOURCE) | |
2181 | return SRC_READY; | |
2182 | else | |
2183 | return SNK_READY; | |
2184 | } | |
2185 | ||
2186 | static inline enum tcpm_state unattached_state(struct tcpm_port *port) | |
2187 | { | |
13cb492c BJS |
2188 | if (port->port_type == TYPEC_PORT_DRP) { |
2189 | if (port->pwr_role == TYPEC_SOURCE) | |
2190 | return SRC_UNATTACHED; | |
2191 | else | |
2192 | return SNK_UNATTACHED; | |
2193 | } else if (port->port_type == TYPEC_PORT_DFP) { | |
f0690a25 | 2194 | return SRC_UNATTACHED; |
13cb492c BJS |
2195 | } |
2196 | ||
2197 | return SNK_UNATTACHED; | |
f0690a25 GR |
2198 | } |
2199 | ||
2200 | static void tcpm_check_send_discover(struct tcpm_port *port) | |
2201 | { | |
2202 | if (port->data_role == TYPEC_HOST && port->send_discover && | |
2203 | port->pd_capable) { | |
2204 | tcpm_send_vdm(port, USB_SID_PD, CMD_DISCOVER_IDENT, NULL, 0); | |
2205 | port->send_discover = false; | |
2206 | } | |
2207 | } | |
2208 | ||
2209 | static void tcpm_swap_complete(struct tcpm_port *port, int result) | |
2210 | { | |
2211 | if (port->swap_pending) { | |
2212 | port->swap_status = result; | |
2213 | port->swap_pending = false; | |
b17dd571 | 2214 | port->non_pd_role_swap = false; |
f0690a25 GR |
2215 | complete(&port->swap_complete); |
2216 | } | |
2217 | } | |
2218 | ||
53b70e5c | 2219 | static enum typec_pwr_opmode tcpm_get_pwr_opmode(enum typec_cc_status cc) |
fce042f0 BJS |
2220 | { |
2221 | switch (cc) { | |
2222 | case TYPEC_CC_RP_1_5: | |
2223 | return TYPEC_PWR_MODE_1_5A; | |
2224 | case TYPEC_CC_RP_3_0: | |
2225 | return TYPEC_PWR_MODE_3_0A; | |
2226 | case TYPEC_CC_RP_DEF: | |
2227 | default: | |
2228 | return TYPEC_PWR_MODE_USB; | |
2229 | } | |
2230 | } | |
2231 | ||
f0690a25 GR |
2232 | static void run_state_machine(struct tcpm_port *port) |
2233 | { | |
2234 | int ret; | |
fce042f0 | 2235 | enum typec_pwr_opmode opmode; |
131c7d12 | 2236 | unsigned int msecs; |
f0690a25 GR |
2237 | |
2238 | port->enter_state = port->state; | |
2239 | switch (port->state) { | |
2240 | case DRP_TOGGLING: | |
2241 | break; | |
2242 | /* SRC states */ | |
2243 | case SRC_UNATTACHED: | |
b17dd571 GR |
2244 | if (!port->non_pd_role_swap) |
2245 | tcpm_swap_complete(port, -ENOTCONN); | |
f0690a25 GR |
2246 | tcpm_src_detach(port); |
2247 | if (tcpm_start_drp_toggling(port)) { | |
2248 | tcpm_set_state(port, DRP_TOGGLING, 0); | |
2249 | break; | |
2250 | } | |
2251 | tcpm_set_cc(port, tcpm_rp_cc(port)); | |
9b0ae699 | 2252 | if (port->port_type == TYPEC_PORT_DRP) |
f0690a25 GR |
2253 | tcpm_set_state(port, SNK_UNATTACHED, PD_T_DRP_SNK); |
2254 | break; | |
2255 | case SRC_ATTACH_WAIT: | |
2256 | if (tcpm_port_is_debug(port)) | |
2257 | tcpm_set_state(port, DEBUG_ACC_ATTACHED, | |
2258 | PD_T_CC_DEBOUNCE); | |
2259 | else if (tcpm_port_is_audio(port)) | |
2260 | tcpm_set_state(port, AUDIO_ACC_ATTACHED, | |
2261 | PD_T_CC_DEBOUNCE); | |
2262 | else if (tcpm_port_is_source(port)) | |
2263 | tcpm_set_state(port, | |
2264 | tcpm_try_snk(port) ? SNK_TRY | |
2265 | : SRC_ATTACHED, | |
2266 | PD_T_CC_DEBOUNCE); | |
2267 | break; | |
2268 | ||
2269 | case SNK_TRY: | |
2270 | port->try_snk_count++; | |
2271 | /* | |
2272 | * Requirements: | |
2273 | * - Do not drive vconn or vbus | |
2274 | * - Terminate CC pins (both) to Rd | |
2275 | * Action: | |
2276 | * - Wait for tDRPTry (PD_T_DRP_TRY). | |
2277 | * Until then, ignore any state changes. | |
2278 | */ | |
2279 | tcpm_set_cc(port, TYPEC_CC_RD); | |
2280 | tcpm_set_state(port, SNK_TRY_WAIT, PD_T_DRP_TRY); | |
2281 | break; | |
2282 | case SNK_TRY_WAIT: | |
a0a3e04e BJS |
2283 | if (tcpm_port_is_sink(port)) { |
2284 | tcpm_set_state(port, SNK_TRY_WAIT_DEBOUNCE, 0); | |
2285 | } else { | |
2286 | tcpm_set_state(port, SRC_TRYWAIT, 0); | |
2287 | port->max_wait = 0; | |
2288 | } | |
2289 | break; | |
2290 | case SNK_TRY_WAIT_DEBOUNCE: | |
2291 | tcpm_set_state(port, SNK_TRY_WAIT_DEBOUNCE_CHECK_VBUS, | |
2292 | PD_T_PD_DEBOUNCE); | |
2293 | break; | |
2294 | case SNK_TRY_WAIT_DEBOUNCE_CHECK_VBUS: | |
f0690a25 GR |
2295 | if (port->vbus_present && tcpm_port_is_sink(port)) { |
2296 | tcpm_set_state(port, SNK_ATTACHED, 0); | |
a0a3e04e BJS |
2297 | } else { |
2298 | tcpm_set_state(port, SRC_TRYWAIT, 0); | |
02d5be46 | 2299 | port->max_wait = 0; |
f0690a25 | 2300 | } |
f0690a25 GR |
2301 | break; |
2302 | case SRC_TRYWAIT: | |
2303 | tcpm_set_cc(port, tcpm_rp_cc(port)); | |
02d5be46 BJS |
2304 | if (port->max_wait == 0) { |
2305 | port->max_wait = jiffies + | |
2306 | msecs_to_jiffies(PD_T_DRP_TRY); | |
f0690a25 GR |
2307 | tcpm_set_state(port, SRC_TRYWAIT_UNATTACHED, |
2308 | PD_T_DRP_TRY); | |
02d5be46 BJS |
2309 | } else { |
2310 | if (time_is_after_jiffies(port->max_wait)) | |
2311 | tcpm_set_state(port, SRC_TRYWAIT_UNATTACHED, | |
2312 | jiffies_to_msecs(port->max_wait - | |
2313 | jiffies)); | |
2314 | else | |
2315 | tcpm_set_state(port, SNK_UNATTACHED, 0); | |
2316 | } | |
2317 | break; | |
2318 | case SRC_TRYWAIT_DEBOUNCE: | |
2319 | tcpm_set_state(port, SRC_ATTACHED, PD_T_CC_DEBOUNCE); | |
f0690a25 GR |
2320 | break; |
2321 | case SRC_TRYWAIT_UNATTACHED: | |
2322 | tcpm_set_state(port, SNK_UNATTACHED, 0); | |
2323 | break; | |
2324 | ||
2325 | case SRC_ATTACHED: | |
2326 | ret = tcpm_src_attach(port); | |
2327 | tcpm_set_state(port, SRC_UNATTACHED, | |
2328 | ret < 0 ? 0 : PD_T_PS_SOURCE_ON); | |
2329 | break; | |
2330 | case SRC_STARTUP: | |
fce042f0 BJS |
2331 | opmode = tcpm_get_pwr_opmode(tcpm_rp_cc(port)); |
2332 | typec_set_pwr_opmode(port->typec_port, opmode); | |
f0690a25 GR |
2333 | port->pwr_opmode = TYPEC_PWR_MODE_USB; |
2334 | port->caps_count = 0; | |
2335 | port->message_id = 0; | |
5fec4b54 | 2336 | port->rx_msgid = -1; |
f0690a25 GR |
2337 | port->explicit_contract = false; |
2338 | tcpm_set_state(port, SRC_SEND_CAPABILITIES, 0); | |
2339 | break; | |
2340 | case SRC_SEND_CAPABILITIES: | |
2341 | port->caps_count++; | |
2342 | if (port->caps_count > PD_N_CAPS_COUNT) { | |
2343 | tcpm_set_state(port, SRC_READY, 0); | |
2344 | break; | |
2345 | } | |
2346 | ret = tcpm_pd_send_source_caps(port); | |
2347 | if (ret < 0) { | |
2348 | tcpm_set_state(port, SRC_SEND_CAPABILITIES, | |
2349 | PD_T_SEND_SOURCE_CAP); | |
2350 | } else { | |
2351 | /* | |
2352 | * Per standard, we should clear the reset counter here. | |
2353 | * However, that can result in state machine hang-ups. | |
2354 | * Reset it only in READY state to improve stability. | |
2355 | */ | |
2356 | /* port->hard_reset_count = 0; */ | |
2357 | port->caps_count = 0; | |
2358 | port->pd_capable = true; | |
2359 | tcpm_set_state_cond(port, hard_reset_state(port), | |
2360 | PD_T_SEND_SOURCE_CAP); | |
2361 | } | |
2362 | break; | |
2363 | case SRC_NEGOTIATE_CAPABILITIES: | |
2364 | ret = tcpm_pd_check_request(port); | |
2365 | if (ret < 0) { | |
2366 | tcpm_pd_send_control(port, PD_CTRL_REJECT); | |
2367 | if (!port->explicit_contract) { | |
2368 | tcpm_set_state(port, | |
2369 | SRC_WAIT_NEW_CAPABILITIES, 0); | |
2370 | } else { | |
2371 | tcpm_set_state(port, SRC_READY, 0); | |
2372 | } | |
2373 | } else { | |
2374 | tcpm_pd_send_control(port, PD_CTRL_ACCEPT); | |
2375 | tcpm_set_state(port, SRC_TRANSITION_SUPPLY, | |
2376 | PD_T_SRC_TRANSITION); | |
2377 | } | |
2378 | break; | |
2379 | case SRC_TRANSITION_SUPPLY: | |
2380 | /* XXX: regulator_set_voltage(vbus, ...) */ | |
2381 | tcpm_pd_send_control(port, PD_CTRL_PS_RDY); | |
2382 | port->explicit_contract = true; | |
2383 | typec_set_pwr_opmode(port->typec_port, TYPEC_PWR_MODE_PD); | |
2384 | port->pwr_opmode = TYPEC_PWR_MODE_PD; | |
2385 | tcpm_set_state_cond(port, SRC_READY, 0); | |
2386 | break; | |
2387 | case SRC_READY: | |
2388 | #if 1 | |
2389 | port->hard_reset_count = 0; | |
2390 | #endif | |
2391 | port->try_src_count = 0; | |
2392 | ||
3113bf1a | 2393 | tcpm_swap_complete(port, 0); |
f0690a25 | 2394 | tcpm_typec_connect(port); |
f0690a25 GR |
2395 | tcpm_check_send_discover(port); |
2396 | /* | |
2397 | * 6.3.5 | |
2398 | * Sending ping messages is not necessary if | |
2399 | * - the source operates at vSafe5V | |
2400 | * or | |
2401 | * - The system is not operating in PD mode | |
2402 | * or | |
2403 | * - Both partners are connected using a Type-C connector | |
f451ac9e BJS |
2404 | * |
2405 | * There is no actual need to send PD messages since the local | |
2406 | * port type-c and the spec does not clearly say whether PD is | |
2407 | * possible when type-c is connected to Type-A/B | |
f0690a25 | 2408 | */ |
f0690a25 GR |
2409 | break; |
2410 | case SRC_WAIT_NEW_CAPABILITIES: | |
2411 | /* Nothing to do... */ | |
2412 | break; | |
2413 | ||
2414 | /* SNK states */ | |
2415 | case SNK_UNATTACHED: | |
b17dd571 GR |
2416 | if (!port->non_pd_role_swap) |
2417 | tcpm_swap_complete(port, -ENOTCONN); | |
f0690a25 GR |
2418 | tcpm_snk_detach(port); |
2419 | if (tcpm_start_drp_toggling(port)) { | |
2420 | tcpm_set_state(port, DRP_TOGGLING, 0); | |
2421 | break; | |
2422 | } | |
2423 | tcpm_set_cc(port, TYPEC_CC_RD); | |
9b0ae699 | 2424 | if (port->port_type == TYPEC_PORT_DRP) |
f0690a25 GR |
2425 | tcpm_set_state(port, SRC_UNATTACHED, PD_T_DRP_SRC); |
2426 | break; | |
2427 | case SNK_ATTACH_WAIT: | |
2428 | if ((port->cc1 == TYPEC_CC_OPEN && | |
2429 | port->cc2 != TYPEC_CC_OPEN) || | |
2430 | (port->cc1 != TYPEC_CC_OPEN && | |
2431 | port->cc2 == TYPEC_CC_OPEN)) | |
2432 | tcpm_set_state(port, SNK_DEBOUNCED, | |
2433 | PD_T_CC_DEBOUNCE); | |
2434 | else if (tcpm_port_is_disconnected(port)) | |
2435 | tcpm_set_state(port, SNK_UNATTACHED, | |
2436 | PD_T_PD_DEBOUNCE); | |
2437 | break; | |
2438 | case SNK_DEBOUNCED: | |
2439 | if (tcpm_port_is_disconnected(port)) | |
2440 | tcpm_set_state(port, SNK_UNATTACHED, | |
2441 | PD_T_PD_DEBOUNCE); | |
2442 | else if (port->vbus_present) | |
2443 | tcpm_set_state(port, | |
2444 | tcpm_try_src(port) ? SRC_TRY | |
2445 | : SNK_ATTACHED, | |
2446 | 0); | |
2447 | else | |
2448 | /* Wait for VBUS, but not forever */ | |
56277035 | 2449 | tcpm_set_state(port, PORT_RESET, PD_T_PS_SOURCE_ON); |
f0690a25 GR |
2450 | break; |
2451 | ||
2452 | case SRC_TRY: | |
2453 | port->try_src_count++; | |
2454 | tcpm_set_cc(port, tcpm_rp_cc(port)); | |
131c7d12 BJS |
2455 | port->max_wait = 0; |
2456 | tcpm_set_state(port, SRC_TRY_WAIT, 0); | |
2457 | break; | |
2458 | case SRC_TRY_WAIT: | |
2459 | if (port->max_wait == 0) { | |
2460 | port->max_wait = jiffies + | |
2461 | msecs_to_jiffies(PD_T_DRP_TRY); | |
2462 | msecs = PD_T_DRP_TRY; | |
2463 | } else { | |
2464 | if (time_is_after_jiffies(port->max_wait)) | |
2465 | msecs = jiffies_to_msecs(port->max_wait - | |
2466 | jiffies); | |
2467 | else | |
2468 | msecs = 0; | |
2469 | } | |
2470 | tcpm_set_state(port, SNK_TRYWAIT, msecs); | |
f0690a25 GR |
2471 | break; |
2472 | case SRC_TRY_DEBOUNCE: | |
2473 | tcpm_set_state(port, SRC_ATTACHED, PD_T_PD_DEBOUNCE); | |
2474 | break; | |
2475 | case SNK_TRYWAIT: | |
2476 | tcpm_set_cc(port, TYPEC_CC_RD); | |
af450ebb | 2477 | tcpm_set_state(port, SNK_TRYWAIT_VBUS, PD_T_CC_DEBOUNCE); |
f0690a25 | 2478 | break; |
af450ebb BJS |
2479 | case SNK_TRYWAIT_VBUS: |
2480 | /* | |
2481 | * TCPM stays in this state indefinitely until VBUS | |
2482 | * is detected as long as Rp is not detected for | |
2483 | * more than a time period of tPDDebounce. | |
2484 | */ | |
2485 | if (port->vbus_present && tcpm_port_is_sink(port)) { | |
f0690a25 GR |
2486 | tcpm_set_state(port, SNK_ATTACHED, 0); |
2487 | break; | |
2488 | } | |
af450ebb BJS |
2489 | if (!tcpm_port_is_sink(port)) |
2490 | tcpm_set_state(port, SNK_TRYWAIT_DEBOUNCE, 0); | |
f0690a25 | 2491 | break; |
af450ebb BJS |
2492 | case SNK_TRYWAIT_DEBOUNCE: |
2493 | tcpm_set_state(port, SNK_UNATTACHED, PD_T_PD_DEBOUNCE); | |
f0690a25 | 2494 | break; |
f0690a25 GR |
2495 | case SNK_ATTACHED: |
2496 | ret = tcpm_snk_attach(port); | |
2497 | if (ret < 0) | |
2498 | tcpm_set_state(port, SNK_UNATTACHED, 0); | |
2499 | else | |
2500 | tcpm_set_state(port, SNK_STARTUP, 0); | |
2501 | break; | |
2502 | case SNK_STARTUP: | |
fce042f0 BJS |
2503 | opmode = tcpm_get_pwr_opmode(port->polarity ? |
2504 | port->cc2 : port->cc1); | |
2505 | typec_set_pwr_opmode(port->typec_port, opmode); | |
f0690a25 GR |
2506 | port->pwr_opmode = TYPEC_PWR_MODE_USB; |
2507 | port->message_id = 0; | |
5fec4b54 | 2508 | port->rx_msgid = -1; |
f0690a25 GR |
2509 | port->explicit_contract = false; |
2510 | tcpm_set_state(port, SNK_DISCOVERY, 0); | |
2511 | break; | |
2512 | case SNK_DISCOVERY: | |
2513 | if (port->vbus_present) { | |
2514 | tcpm_set_current_limit(port, | |
2515 | tcpm_get_current_limit(port), | |
2516 | 5000); | |
2517 | tcpm_set_charge(port, true); | |
2518 | tcpm_set_state(port, SNK_WAIT_CAPABILITIES, 0); | |
2519 | break; | |
2520 | } | |
2521 | /* | |
2522 | * For DRP, timeouts differ. Also, handling is supposed to be | |
2523 | * different and much more complex (dead battery detection; | |
2524 | * see USB power delivery specification, section 8.3.3.6.1.5.1). | |
2525 | */ | |
2526 | tcpm_set_state(port, hard_reset_state(port), | |
9b0ae699 | 2527 | port->port_type == TYPEC_PORT_DRP ? |
f0690a25 GR |
2528 | PD_T_DB_DETECT : PD_T_NO_RESPONSE); |
2529 | break; | |
2530 | case SNK_DISCOVERY_DEBOUNCE: | |
2531 | tcpm_set_state(port, SNK_DISCOVERY_DEBOUNCE_DONE, | |
2532 | PD_T_CC_DEBOUNCE); | |
2533 | break; | |
2534 | case SNK_DISCOVERY_DEBOUNCE_DONE: | |
2535 | if (!tcpm_port_is_disconnected(port) && | |
2536 | tcpm_port_is_sink(port) && | |
2537 | time_is_after_jiffies(port->delayed_runtime)) { | |
2538 | tcpm_set_state(port, SNK_DISCOVERY, | |
2539 | port->delayed_runtime - jiffies); | |
2540 | break; | |
2541 | } | |
2542 | tcpm_set_state(port, unattached_state(port), 0); | |
2543 | break; | |
2544 | case SNK_WAIT_CAPABILITIES: | |
2545 | ret = port->tcpc->set_pd_rx(port->tcpc, true); | |
2546 | if (ret < 0) { | |
2547 | tcpm_set_state(port, SNK_READY, 0); | |
2548 | break; | |
2549 | } | |
2550 | /* | |
2551 | * If VBUS has never been low, and we time out waiting | |
2552 | * for source cap, try a soft reset first, in case we | |
2553 | * were already in a stable contract before this boot. | |
2554 | * Do this only once. | |
2555 | */ | |
2556 | if (port->vbus_never_low) { | |
2557 | port->vbus_never_low = false; | |
2558 | tcpm_set_state(port, SOFT_RESET_SEND, | |
2559 | PD_T_SINK_WAIT_CAP); | |
2560 | } else { | |
2561 | tcpm_set_state(port, hard_reset_state(port), | |
2562 | PD_T_SINK_WAIT_CAP); | |
2563 | } | |
2564 | break; | |
2565 | case SNK_NEGOTIATE_CAPABILITIES: | |
2566 | port->pd_capable = true; | |
2567 | port->hard_reset_count = 0; | |
2568 | ret = tcpm_pd_send_request(port); | |
2569 | if (ret < 0) { | |
2570 | /* Let the Source send capabilities again. */ | |
2571 | tcpm_set_state(port, SNK_WAIT_CAPABILITIES, 0); | |
2572 | } else { | |
2573 | tcpm_set_state_cond(port, hard_reset_state(port), | |
2574 | PD_T_SENDER_RESPONSE); | |
2575 | } | |
2576 | break; | |
2577 | case SNK_TRANSITION_SINK: | |
2578 | case SNK_TRANSITION_SINK_VBUS: | |
2579 | tcpm_set_state(port, hard_reset_state(port), | |
2580 | PD_T_PS_TRANSITION); | |
2581 | break; | |
2582 | case SNK_READY: | |
2583 | port->try_snk_count = 0; | |
8bf05746 BJS |
2584 | if (port->explicit_contract) { |
2585 | typec_set_pwr_opmode(port->typec_port, | |
2586 | TYPEC_PWR_MODE_PD); | |
2587 | port->pwr_opmode = TYPEC_PWR_MODE_PD; | |
2588 | } | |
f0690a25 | 2589 | |
3113bf1a | 2590 | tcpm_swap_complete(port, 0); |
f0690a25 | 2591 | tcpm_typec_connect(port); |
f0690a25 GR |
2592 | tcpm_check_send_discover(port); |
2593 | break; | |
2594 | ||
2595 | /* Accessory states */ | |
2596 | case ACC_UNATTACHED: | |
2597 | tcpm_acc_detach(port); | |
2598 | tcpm_set_state(port, SRC_UNATTACHED, 0); | |
2599 | break; | |
2600 | case DEBUG_ACC_ATTACHED: | |
2601 | case AUDIO_ACC_ATTACHED: | |
2602 | ret = tcpm_acc_attach(port); | |
2603 | if (ret < 0) | |
2604 | tcpm_set_state(port, ACC_UNATTACHED, 0); | |
2605 | break; | |
2606 | case AUDIO_ACC_DEBOUNCE: | |
2607 | tcpm_set_state(port, ACC_UNATTACHED, PD_T_CC_DEBOUNCE); | |
2608 | break; | |
2609 | ||
2610 | /* Hard_Reset states */ | |
2611 | case HARD_RESET_SEND: | |
2612 | tcpm_pd_transmit(port, TCPC_TX_HARD_RESET, NULL); | |
2613 | tcpm_set_state(port, HARD_RESET_START, 0); | |
2614 | break; | |
2615 | case HARD_RESET_START: | |
2616 | port->hard_reset_count++; | |
2617 | port->tcpc->set_pd_rx(port->tcpc, false); | |
2618 | tcpm_unregister_altmodes(port); | |
2619 | port->send_discover = true; | |
2620 | if (port->pwr_role == TYPEC_SOURCE) | |
2621 | tcpm_set_state(port, SRC_HARD_RESET_VBUS_OFF, | |
2622 | PD_T_PS_HARD_RESET); | |
2623 | else | |
2624 | tcpm_set_state(port, SNK_HARD_RESET_SINK_OFF, 0); | |
2625 | break; | |
2626 | case SRC_HARD_RESET_VBUS_OFF: | |
2627 | tcpm_set_vconn(port, true); | |
2628 | tcpm_set_vbus(port, false); | |
2629 | tcpm_set_roles(port, false, TYPEC_SOURCE, TYPEC_HOST); | |
2630 | tcpm_set_state(port, SRC_HARD_RESET_VBUS_ON, PD_T_SRC_RECOVER); | |
2631 | break; | |
2632 | case SRC_HARD_RESET_VBUS_ON: | |
2633 | tcpm_set_vbus(port, true); | |
2634 | port->tcpc->set_pd_rx(port->tcpc, true); | |
2635 | tcpm_set_attached_state(port, true); | |
2636 | tcpm_set_state(port, SRC_UNATTACHED, PD_T_PS_SOURCE_ON); | |
2637 | break; | |
2638 | case SNK_HARD_RESET_SINK_OFF: | |
2639 | tcpm_set_vconn(port, false); | |
2640 | tcpm_set_charge(port, false); | |
2641 | tcpm_set_roles(port, false, TYPEC_SINK, TYPEC_DEVICE); | |
2642 | /* | |
2643 | * VBUS may or may not toggle, depending on the adapter. | |
2644 | * If it doesn't toggle, transition to SNK_HARD_RESET_SINK_ON | |
2645 | * directly after timeout. | |
2646 | */ | |
2647 | tcpm_set_state(port, SNK_HARD_RESET_SINK_ON, PD_T_SAFE_0V); | |
2648 | break; | |
2649 | case SNK_HARD_RESET_WAIT_VBUS: | |
2650 | /* Assume we're disconnected if VBUS doesn't come back. */ | |
2651 | tcpm_set_state(port, SNK_UNATTACHED, | |
2652 | PD_T_SRC_RECOVER_MAX + PD_T_SRC_TURN_ON); | |
2653 | break; | |
2654 | case SNK_HARD_RESET_SINK_ON: | |
2655 | /* Note: There is no guarantee that VBUS is on in this state */ | |
2656 | /* | |
2657 | * XXX: | |
2658 | * The specification suggests that dual mode ports in sink | |
2659 | * mode should transition to state PE_SRC_Transition_to_default. | |
2660 | * See USB power delivery specification chapter 8.3.3.6.1.3. | |
2661 | * This would mean to to | |
2662 | * - turn off VCONN, reset power supply | |
2663 | * - request hardware reset | |
2664 | * - turn on VCONN | |
2665 | * - Transition to state PE_Src_Startup | |
2666 | * SNK only ports shall transition to state Snk_Startup | |
2667 | * (see chapter 8.3.3.3.8). | |
2668 | * Similar, dual-mode ports in source mode should transition | |
2669 | * to PE_SNK_Transition_to_default. | |
2670 | */ | |
2671 | tcpm_set_attached_state(port, true); | |
2672 | tcpm_set_state(port, SNK_STARTUP, 0); | |
2673 | break; | |
2674 | ||
2675 | /* Soft_Reset states */ | |
2676 | case SOFT_RESET: | |
2677 | port->message_id = 0; | |
5fec4b54 | 2678 | port->rx_msgid = -1; |
f0690a25 GR |
2679 | tcpm_pd_send_control(port, PD_CTRL_ACCEPT); |
2680 | if (port->pwr_role == TYPEC_SOURCE) | |
2681 | tcpm_set_state(port, SRC_SEND_CAPABILITIES, 0); | |
2682 | else | |
2683 | tcpm_set_state(port, SNK_WAIT_CAPABILITIES, 0); | |
2684 | break; | |
2685 | case SOFT_RESET_SEND: | |
2686 | port->message_id = 0; | |
5fec4b54 | 2687 | port->rx_msgid = -1; |
f0690a25 GR |
2688 | if (tcpm_pd_send_control(port, PD_CTRL_SOFT_RESET)) |
2689 | tcpm_set_state_cond(port, hard_reset_state(port), 0); | |
2690 | else | |
2691 | tcpm_set_state_cond(port, hard_reset_state(port), | |
2692 | PD_T_SENDER_RESPONSE); | |
2693 | break; | |
2694 | ||
2695 | /* DR_Swap states */ | |
2696 | case DR_SWAP_SEND: | |
2697 | tcpm_pd_send_control(port, PD_CTRL_DR_SWAP); | |
2698 | tcpm_set_state_cond(port, DR_SWAP_SEND_TIMEOUT, | |
2699 | PD_T_SENDER_RESPONSE); | |
2700 | break; | |
2701 | case DR_SWAP_ACCEPT: | |
2702 | tcpm_pd_send_control(port, PD_CTRL_ACCEPT); | |
2703 | tcpm_set_state_cond(port, DR_SWAP_CHANGE_DR, 0); | |
2704 | break; | |
2705 | case DR_SWAP_SEND_TIMEOUT: | |
2706 | tcpm_swap_complete(port, -ETIMEDOUT); | |
2707 | tcpm_set_state(port, ready_state(port), 0); | |
2708 | break; | |
2709 | case DR_SWAP_CHANGE_DR: | |
2710 | if (port->data_role == TYPEC_HOST) { | |
2711 | tcpm_unregister_altmodes(port); | |
2712 | tcpm_set_roles(port, true, port->pwr_role, | |
2713 | TYPEC_DEVICE); | |
2714 | } else { | |
2715 | tcpm_set_roles(port, true, port->pwr_role, | |
2716 | TYPEC_HOST); | |
2717 | port->send_discover = true; | |
2718 | } | |
f0690a25 GR |
2719 | tcpm_set_state(port, ready_state(port), 0); |
2720 | break; | |
2721 | ||
2722 | /* PR_Swap states */ | |
2723 | case PR_SWAP_ACCEPT: | |
2724 | tcpm_pd_send_control(port, PD_CTRL_ACCEPT); | |
2725 | tcpm_set_state(port, PR_SWAP_START, 0); | |
2726 | break; | |
2727 | case PR_SWAP_SEND: | |
2728 | tcpm_pd_send_control(port, PD_CTRL_PR_SWAP); | |
2729 | tcpm_set_state_cond(port, PR_SWAP_SEND_TIMEOUT, | |
2730 | PD_T_SENDER_RESPONSE); | |
2731 | break; | |
2732 | case PR_SWAP_SEND_TIMEOUT: | |
2733 | tcpm_swap_complete(port, -ETIMEDOUT); | |
2734 | tcpm_set_state(port, ready_state(port), 0); | |
2735 | break; | |
2736 | case PR_SWAP_START: | |
2737 | if (port->pwr_role == TYPEC_SOURCE) | |
2738 | tcpm_set_state(port, PR_SWAP_SRC_SNK_TRANSITION_OFF, | |
2739 | PD_T_SRC_TRANSITION); | |
2740 | else | |
2741 | tcpm_set_state(port, PR_SWAP_SNK_SRC_SINK_OFF, 0); | |
2742 | break; | |
2743 | case PR_SWAP_SRC_SNK_TRANSITION_OFF: | |
2744 | tcpm_set_vbus(port, false); | |
2745 | port->explicit_contract = false; | |
b965b631 | 2746 | /* allow time for Vbus discharge, must be < tSrcSwapStdby */ |
f0690a25 | 2747 | tcpm_set_state(port, PR_SWAP_SRC_SNK_SOURCE_OFF, |
b965b631 | 2748 | PD_T_SRCSWAPSTDBY); |
f0690a25 GR |
2749 | break; |
2750 | case PR_SWAP_SRC_SNK_SOURCE_OFF: | |
2751 | tcpm_set_cc(port, TYPEC_CC_RD); | |
b965b631 BJS |
2752 | /* allow CC debounce */ |
2753 | tcpm_set_state(port, PR_SWAP_SRC_SNK_SOURCE_OFF_CC_DEBOUNCED, | |
2754 | PD_T_CC_DEBOUNCE); | |
2755 | break; | |
2756 | case PR_SWAP_SRC_SNK_SOURCE_OFF_CC_DEBOUNCED: | |
050161ea GR |
2757 | /* |
2758 | * USB-PD standard, 6.2.1.4, Port Power Role: | |
2759 | * "During the Power Role Swap Sequence, for the initial Source | |
2760 | * Port, the Port Power Role field shall be set to Sink in the | |
2761 | * PS_RDY Message indicating that the initial Source’s power | |
2762 | * supply is turned off" | |
2763 | */ | |
2764 | tcpm_set_pwr_role(port, TYPEC_SINK); | |
f0690a25 GR |
2765 | if (tcpm_pd_send_control(port, PD_CTRL_PS_RDY)) { |
2766 | tcpm_set_state(port, ERROR_RECOVERY, 0); | |
2767 | break; | |
2768 | } | |
2769 | tcpm_set_state_cond(port, SNK_UNATTACHED, PD_T_PS_SOURCE_ON); | |
2770 | break; | |
2771 | case PR_SWAP_SRC_SNK_SINK_ON: | |
f0690a25 GR |
2772 | tcpm_set_state(port, SNK_STARTUP, 0); |
2773 | break; | |
2774 | case PR_SWAP_SNK_SRC_SINK_OFF: | |
2775 | tcpm_set_charge(port, false); | |
2776 | tcpm_set_state(port, hard_reset_state(port), | |
2777 | PD_T_PS_SOURCE_OFF); | |
2778 | break; | |
2779 | case PR_SWAP_SNK_SRC_SOURCE_ON: | |
2780 | tcpm_set_cc(port, tcpm_rp_cc(port)); | |
2781 | tcpm_set_vbus(port, true); | |
b965b631 BJS |
2782 | /* |
2783 | * allow time VBUS ramp-up, must be < tNewSrc | |
2784 | * Also, this window overlaps with CC debounce as well. | |
2785 | * So, Wait for the max of two which is PD_T_NEWSRC | |
2786 | */ | |
2787 | tcpm_set_state(port, PR_SWAP_SNK_SRC_SOURCE_ON_VBUS_RAMPED_UP, | |
2788 | PD_T_NEWSRC); | |
2789 | break; | |
2790 | case PR_SWAP_SNK_SRC_SOURCE_ON_VBUS_RAMPED_UP: | |
050161ea GR |
2791 | /* |
2792 | * USB PD standard, 6.2.1.4: | |
2793 | * "Subsequent Messages initiated by the Policy Engine, | |
2794 | * such as the PS_RDY Message sent to indicate that Vbus | |
2795 | * is ready, will have the Port Power Role field set to | |
2796 | * Source." | |
2797 | */ | |
f0690a25 | 2798 | tcpm_set_pwr_role(port, TYPEC_SOURCE); |
050161ea | 2799 | tcpm_pd_send_control(port, PD_CTRL_PS_RDY); |
f0690a25 GR |
2800 | tcpm_set_state(port, SRC_STARTUP, 0); |
2801 | break; | |
2802 | ||
2803 | case VCONN_SWAP_ACCEPT: | |
2804 | tcpm_pd_send_control(port, PD_CTRL_ACCEPT); | |
2805 | tcpm_set_state(port, VCONN_SWAP_START, 0); | |
2806 | break; | |
2807 | case VCONN_SWAP_SEND: | |
2808 | tcpm_pd_send_control(port, PD_CTRL_VCONN_SWAP); | |
2809 | tcpm_set_state(port, VCONN_SWAP_SEND_TIMEOUT, | |
2810 | PD_T_SENDER_RESPONSE); | |
2811 | break; | |
2812 | case VCONN_SWAP_SEND_TIMEOUT: | |
2813 | tcpm_swap_complete(port, -ETIMEDOUT); | |
2814 | tcpm_set_state(port, ready_state(port), 0); | |
2815 | break; | |
2816 | case VCONN_SWAP_START: | |
2817 | if (port->vconn_role == TYPEC_SOURCE) | |
2818 | tcpm_set_state(port, VCONN_SWAP_WAIT_FOR_VCONN, 0); | |
2819 | else | |
2820 | tcpm_set_state(port, VCONN_SWAP_TURN_ON_VCONN, 0); | |
2821 | break; | |
2822 | case VCONN_SWAP_WAIT_FOR_VCONN: | |
2823 | tcpm_set_state(port, hard_reset_state(port), | |
2824 | PD_T_VCONN_SOURCE_ON); | |
2825 | break; | |
2826 | case VCONN_SWAP_TURN_ON_VCONN: | |
2827 | tcpm_set_vconn(port, true); | |
2828 | tcpm_pd_send_control(port, PD_CTRL_PS_RDY); | |
f0690a25 GR |
2829 | tcpm_set_state(port, ready_state(port), 0); |
2830 | break; | |
2831 | case VCONN_SWAP_TURN_OFF_VCONN: | |
2832 | tcpm_set_vconn(port, false); | |
f0690a25 GR |
2833 | tcpm_set_state(port, ready_state(port), 0); |
2834 | break; | |
2835 | ||
2836 | case DR_SWAP_CANCEL: | |
2837 | case PR_SWAP_CANCEL: | |
2838 | case VCONN_SWAP_CANCEL: | |
2839 | tcpm_swap_complete(port, port->swap_status); | |
2840 | if (port->pwr_role == TYPEC_SOURCE) | |
2841 | tcpm_set_state(port, SRC_READY, 0); | |
2842 | else | |
2843 | tcpm_set_state(port, SNK_READY, 0); | |
2844 | break; | |
2845 | ||
2846 | case BIST_RX: | |
2847 | switch (BDO_MODE_MASK(port->bist_request)) { | |
2848 | case BDO_MODE_CARRIER2: | |
2849 | tcpm_pd_transmit(port, TCPC_TX_BIST_MODE_2, NULL); | |
2850 | break; | |
2851 | default: | |
2852 | break; | |
2853 | } | |
2854 | /* Always switch to unattached state */ | |
2855 | tcpm_set_state(port, unattached_state(port), 0); | |
2856 | break; | |
2857 | case ERROR_RECOVERY: | |
2858 | tcpm_swap_complete(port, -EPROTO); | |
b17dd571 GR |
2859 | tcpm_set_state(port, PORT_RESET, 0); |
2860 | break; | |
2861 | case PORT_RESET: | |
f0690a25 | 2862 | tcpm_reset_port(port); |
f0690a25 | 2863 | tcpm_set_cc(port, TYPEC_CC_OPEN); |
b17dd571 | 2864 | tcpm_set_state(port, PORT_RESET_WAIT_OFF, |
f0690a25 GR |
2865 | PD_T_ERROR_RECOVERY); |
2866 | break; | |
b17dd571 | 2867 | case PORT_RESET_WAIT_OFF: |
f0690a25 GR |
2868 | tcpm_set_state(port, |
2869 | tcpm_default_state(port), | |
2870 | port->vbus_present ? PD_T_PS_SOURCE_OFF : 0); | |
2871 | break; | |
2872 | default: | |
2873 | WARN(1, "Unexpected port state %d\n", port->state); | |
2874 | break; | |
2875 | } | |
2876 | } | |
2877 | ||
2878 | static void tcpm_state_machine_work(struct work_struct *work) | |
2879 | { | |
2880 | struct tcpm_port *port = container_of(work, struct tcpm_port, | |
2881 | state_machine.work); | |
2882 | enum tcpm_state prev_state; | |
2883 | ||
2884 | mutex_lock(&port->lock); | |
2885 | port->state_machine_running = true; | |
2886 | ||
2887 | if (port->queued_message && tcpm_send_queued_message(port)) | |
2888 | goto done; | |
2889 | ||
2890 | /* If we were queued due to a delayed state change, update it now */ | |
2891 | if (port->delayed_state) { | |
2892 | tcpm_log(port, "state change %s -> %s [delayed %ld ms]", | |
2893 | tcpm_states[port->state], | |
2894 | tcpm_states[port->delayed_state], port->delay_ms); | |
2895 | port->prev_state = port->state; | |
2896 | port->state = port->delayed_state; | |
2897 | port->delayed_state = INVALID_STATE; | |
2898 | } | |
2899 | ||
2900 | /* | |
2901 | * Continue running as long as we have (non-delayed) state changes | |
2902 | * to make. | |
2903 | */ | |
2904 | do { | |
2905 | prev_state = port->state; | |
2906 | run_state_machine(port); | |
2907 | if (port->queued_message) | |
2908 | tcpm_send_queued_message(port); | |
2909 | } while (port->state != prev_state && !port->delayed_state); | |
2910 | ||
2911 | done: | |
2912 | port->state_machine_running = false; | |
2913 | mutex_unlock(&port->lock); | |
2914 | } | |
2915 | ||
2916 | static void _tcpm_cc_change(struct tcpm_port *port, enum typec_cc_status cc1, | |
2917 | enum typec_cc_status cc2) | |
2918 | { | |
2919 | enum typec_cc_status old_cc1, old_cc2; | |
2920 | enum tcpm_state new_state; | |
2921 | ||
2922 | old_cc1 = port->cc1; | |
2923 | old_cc2 = port->cc2; | |
2924 | port->cc1 = cc1; | |
2925 | port->cc2 = cc2; | |
2926 | ||
2927 | tcpm_log_force(port, | |
2928 | "CC1: %u -> %u, CC2: %u -> %u [state %s, polarity %d, %s]", | |
2929 | old_cc1, cc1, old_cc2, cc2, tcpm_states[port->state], | |
2930 | port->polarity, | |
2931 | tcpm_port_is_disconnected(port) ? "disconnected" | |
2932 | : "connected"); | |
2933 | ||
2934 | switch (port->state) { | |
2935 | case DRP_TOGGLING: | |
2936 | if (tcpm_port_is_debug(port) || tcpm_port_is_audio(port) || | |
2937 | tcpm_port_is_source(port)) | |
2938 | tcpm_set_state(port, SRC_ATTACH_WAIT, 0); | |
2939 | else if (tcpm_port_is_sink(port)) | |
2940 | tcpm_set_state(port, SNK_ATTACH_WAIT, 0); | |
2941 | break; | |
2942 | case SRC_UNATTACHED: | |
2943 | case ACC_UNATTACHED: | |
2944 | if (tcpm_port_is_debug(port) || tcpm_port_is_audio(port) || | |
2945 | tcpm_port_is_source(port)) | |
2946 | tcpm_set_state(port, SRC_ATTACH_WAIT, 0); | |
2947 | break; | |
2948 | case SRC_ATTACH_WAIT: | |
2949 | if (tcpm_port_is_disconnected(port) || | |
2950 | tcpm_port_is_audio_detached(port)) | |
2951 | tcpm_set_state(port, SRC_UNATTACHED, 0); | |
2952 | else if (cc1 != old_cc1 || cc2 != old_cc2) | |
2953 | tcpm_set_state(port, SRC_ATTACH_WAIT, 0); | |
2954 | break; | |
2955 | case SRC_ATTACHED: | |
f3b73364 BJS |
2956 | case SRC_SEND_CAPABILITIES: |
2957 | case SRC_READY: | |
2958 | if (tcpm_port_is_disconnected(port) || | |
2959 | !tcpm_port_is_source(port)) | |
f0690a25 GR |
2960 | tcpm_set_state(port, SRC_UNATTACHED, 0); |
2961 | break; | |
f0690a25 GR |
2962 | case SNK_UNATTACHED: |
2963 | if (tcpm_port_is_sink(port)) | |
2964 | tcpm_set_state(port, SNK_ATTACH_WAIT, 0); | |
2965 | break; | |
2966 | case SNK_ATTACH_WAIT: | |
2967 | if ((port->cc1 == TYPEC_CC_OPEN && | |
2968 | port->cc2 != TYPEC_CC_OPEN) || | |
2969 | (port->cc1 != TYPEC_CC_OPEN && | |
2970 | port->cc2 == TYPEC_CC_OPEN)) | |
2971 | new_state = SNK_DEBOUNCED; | |
2972 | else if (tcpm_port_is_disconnected(port)) | |
2973 | new_state = SNK_UNATTACHED; | |
2974 | else | |
2975 | break; | |
2976 | if (new_state != port->delayed_state) | |
2977 | tcpm_set_state(port, SNK_ATTACH_WAIT, 0); | |
2978 | break; | |
2979 | case SNK_DEBOUNCED: | |
2980 | if (tcpm_port_is_disconnected(port)) | |
2981 | new_state = SNK_UNATTACHED; | |
2982 | else if (port->vbus_present) | |
2983 | new_state = tcpm_try_src(port) ? SRC_TRY : SNK_ATTACHED; | |
2984 | else | |
2985 | new_state = SNK_UNATTACHED; | |
2986 | if (new_state != port->delayed_state) | |
2987 | tcpm_set_state(port, SNK_DEBOUNCED, 0); | |
2988 | break; | |
2989 | case SNK_READY: | |
2990 | if (tcpm_port_is_disconnected(port)) | |
2991 | tcpm_set_state(port, unattached_state(port), 0); | |
2992 | else if (!port->pd_capable && | |
2993 | (cc1 != old_cc1 || cc2 != old_cc2)) | |
2994 | tcpm_set_current_limit(port, | |
2995 | tcpm_get_current_limit(port), | |
2996 | 5000); | |
2997 | break; | |
2998 | ||
2999 | case AUDIO_ACC_ATTACHED: | |
3000 | if (cc1 == TYPEC_CC_OPEN || cc2 == TYPEC_CC_OPEN) | |
3001 | tcpm_set_state(port, AUDIO_ACC_DEBOUNCE, 0); | |
3002 | break; | |
3003 | case AUDIO_ACC_DEBOUNCE: | |
3004 | if (tcpm_port_is_audio(port)) | |
3005 | tcpm_set_state(port, AUDIO_ACC_ATTACHED, 0); | |
3006 | break; | |
3007 | ||
3008 | case DEBUG_ACC_ATTACHED: | |
3009 | if (cc1 == TYPEC_CC_OPEN || cc2 == TYPEC_CC_OPEN) | |
3010 | tcpm_set_state(port, ACC_UNATTACHED, 0); | |
3011 | break; | |
3012 | ||
3013 | case SNK_TRY: | |
3014 | /* Do nothing, waiting for timeout */ | |
3015 | break; | |
3016 | ||
3017 | case SNK_DISCOVERY: | |
3018 | /* CC line is unstable, wait for debounce */ | |
3019 | if (tcpm_port_is_disconnected(port)) | |
3020 | tcpm_set_state(port, SNK_DISCOVERY_DEBOUNCE, 0); | |
3021 | break; | |
3022 | case SNK_DISCOVERY_DEBOUNCE: | |
3023 | break; | |
3024 | ||
3025 | case SRC_TRYWAIT: | |
3026 | /* Hand over to state machine if needed */ | |
3027 | if (!port->vbus_present && tcpm_port_is_source(port)) | |
02d5be46 BJS |
3028 | tcpm_set_state(port, SRC_TRYWAIT_DEBOUNCE, 0); |
3029 | break; | |
3030 | case SRC_TRYWAIT_DEBOUNCE: | |
3031 | if (port->vbus_present || !tcpm_port_is_source(port)) | |
f0690a25 GR |
3032 | tcpm_set_state(port, SRC_TRYWAIT, 0); |
3033 | break; | |
a0a3e04e BJS |
3034 | case SNK_TRY_WAIT_DEBOUNCE: |
3035 | if (!tcpm_port_is_sink(port)) { | |
3036 | port->max_wait = 0; | |
3037 | tcpm_set_state(port, SRC_TRYWAIT, 0); | |
f0690a25 | 3038 | } |
f0690a25 | 3039 | break; |
131c7d12 | 3040 | case SRC_TRY_WAIT: |
c79d92bd BJS |
3041 | if (tcpm_port_is_source(port)) |
3042 | tcpm_set_state(port, SRC_TRY_DEBOUNCE, 0); | |
f0690a25 GR |
3043 | break; |
3044 | case SRC_TRY_DEBOUNCE: | |
131c7d12 | 3045 | tcpm_set_state(port, SRC_TRY_WAIT, 0); |
f0690a25 GR |
3046 | break; |
3047 | case SNK_TRYWAIT_DEBOUNCE: | |
af450ebb BJS |
3048 | if (tcpm_port_is_sink(port)) |
3049 | tcpm_set_state(port, SNK_TRYWAIT_VBUS, 0); | |
3050 | break; | |
3051 | case SNK_TRYWAIT_VBUS: | |
3052 | if (!tcpm_port_is_sink(port)) | |
f0690a25 GR |
3053 | tcpm_set_state(port, SNK_TRYWAIT_DEBOUNCE, 0); |
3054 | break; | |
af450ebb BJS |
3055 | case SNK_TRYWAIT: |
3056 | /* Do nothing, waiting for tCCDebounce */ | |
3057 | break; | |
f0690a25 GR |
3058 | case PR_SWAP_SNK_SRC_SINK_OFF: |
3059 | case PR_SWAP_SRC_SNK_TRANSITION_OFF: | |
3060 | case PR_SWAP_SRC_SNK_SOURCE_OFF: | |
b965b631 BJS |
3061 | case PR_SWAP_SRC_SNK_SOURCE_OFF_CC_DEBOUNCED: |
3062 | case PR_SWAP_SNK_SRC_SOURCE_ON: | |
f0690a25 | 3063 | /* |
b965b631 | 3064 | * CC state change is expected in PR_SWAP |
f0690a25 GR |
3065 | * Ignore it. |
3066 | */ | |
3067 | break; | |
3068 | ||
3069 | default: | |
3070 | if (tcpm_port_is_disconnected(port)) | |
3071 | tcpm_set_state(port, unattached_state(port), 0); | |
3072 | break; | |
3073 | } | |
3074 | } | |
3075 | ||
3076 | static void _tcpm_pd_vbus_on(struct tcpm_port *port) | |
3077 | { | |
f0690a25 GR |
3078 | tcpm_log_force(port, "VBUS on"); |
3079 | port->vbus_present = true; | |
3080 | switch (port->state) { | |
3081 | case SNK_TRANSITION_SINK_VBUS: | |
8bf05746 | 3082 | port->explicit_contract = true; |
f0690a25 GR |
3083 | tcpm_set_state(port, SNK_READY, 0); |
3084 | break; | |
3085 | case SNK_DISCOVERY: | |
3086 | tcpm_set_state(port, SNK_DISCOVERY, 0); | |
3087 | break; | |
3088 | ||
3089 | case SNK_DEBOUNCED: | |
3090 | tcpm_set_state(port, tcpm_try_src(port) ? SRC_TRY | |
3091 | : SNK_ATTACHED, | |
3092 | 0); | |
3093 | break; | |
3094 | case SNK_HARD_RESET_WAIT_VBUS: | |
3095 | tcpm_set_state(port, SNK_HARD_RESET_SINK_ON, 0); | |
3096 | break; | |
3097 | case SRC_ATTACHED: | |
3098 | tcpm_set_state(port, SRC_STARTUP, 0); | |
3099 | break; | |
3100 | case SRC_HARD_RESET_VBUS_ON: | |
3101 | tcpm_set_state(port, SRC_STARTUP, 0); | |
3102 | break; | |
3103 | ||
3104 | case SNK_TRY: | |
3105 | /* Do nothing, waiting for timeout */ | |
3106 | break; | |
3107 | case SRC_TRYWAIT: | |
02d5be46 BJS |
3108 | /* Do nothing, Waiting for Rd to be detected */ |
3109 | break; | |
3110 | case SRC_TRYWAIT_DEBOUNCE: | |
3111 | tcpm_set_state(port, SRC_TRYWAIT, 0); | |
f0690a25 | 3112 | break; |
a0a3e04e BJS |
3113 | case SNK_TRY_WAIT_DEBOUNCE: |
3114 | /* Do nothing, waiting for PD_DEBOUNCE to do be done */ | |
f0690a25 GR |
3115 | break; |
3116 | case SNK_TRYWAIT: | |
af450ebb BJS |
3117 | /* Do nothing, waiting for tCCDebounce */ |
3118 | break; | |
3119 | case SNK_TRYWAIT_VBUS: | |
3120 | if (tcpm_port_is_sink(port)) | |
3121 | tcpm_set_state(port, SNK_ATTACHED, 0); | |
3122 | break; | |
3123 | case SNK_TRYWAIT_DEBOUNCE: | |
3124 | /* Do nothing, waiting for Rp */ | |
f0690a25 | 3125 | break; |
131c7d12 BJS |
3126 | case SRC_TRY_WAIT: |
3127 | case SRC_TRY_DEBOUNCE: | |
3128 | /* Do nothing, waiting for sink detection */ | |
3129 | break; | |
f0690a25 GR |
3130 | default: |
3131 | break; | |
3132 | } | |
3133 | } | |
3134 | ||
3135 | static void _tcpm_pd_vbus_off(struct tcpm_port *port) | |
3136 | { | |
f0690a25 GR |
3137 | tcpm_log_force(port, "VBUS off"); |
3138 | port->vbus_present = false; | |
3139 | port->vbus_never_low = false; | |
3140 | switch (port->state) { | |
3141 | case SNK_HARD_RESET_SINK_OFF: | |
3142 | tcpm_set_state(port, SNK_HARD_RESET_WAIT_VBUS, 0); | |
3143 | break; | |
3144 | case SRC_HARD_RESET_VBUS_OFF: | |
3145 | tcpm_set_state(port, SRC_HARD_RESET_VBUS_ON, 0); | |
3146 | break; | |
3147 | case HARD_RESET_SEND: | |
3148 | break; | |
3149 | ||
3150 | case SNK_TRY: | |
3151 | /* Do nothing, waiting for timeout */ | |
3152 | break; | |
3153 | case SRC_TRYWAIT: | |
3154 | /* Hand over to state machine if needed */ | |
3155 | if (tcpm_port_is_source(port)) | |
02d5be46 | 3156 | tcpm_set_state(port, SRC_TRYWAIT_DEBOUNCE, 0); |
f0690a25 | 3157 | break; |
a0a3e04e BJS |
3158 | case SNK_TRY_WAIT_DEBOUNCE: |
3159 | /* Do nothing, waiting for PD_DEBOUNCE to do be done */ | |
f0690a25 | 3160 | break; |
af450ebb | 3161 | case SNK_TRYWAIT: |
f0690a25 | 3162 | case SNK_TRYWAIT_VBUS: |
af450ebb | 3163 | case SNK_TRYWAIT_DEBOUNCE: |
f0690a25 | 3164 | break; |
f0690a25 GR |
3165 | case SNK_ATTACH_WAIT: |
3166 | tcpm_set_state(port, SNK_UNATTACHED, 0); | |
3167 | break; | |
3168 | ||
3169 | case SNK_NEGOTIATE_CAPABILITIES: | |
3170 | break; | |
3171 | ||
3172 | case PR_SWAP_SRC_SNK_TRANSITION_OFF: | |
3173 | tcpm_set_state(port, PR_SWAP_SRC_SNK_SOURCE_OFF, 0); | |
3174 | break; | |
3175 | ||
3176 | case PR_SWAP_SNK_SRC_SINK_OFF: | |
3177 | /* Do nothing, expected */ | |
3178 | break; | |
3179 | ||
b17dd571 | 3180 | case PORT_RESET_WAIT_OFF: |
c749d4d0 | 3181 | tcpm_set_state(port, tcpm_default_state(port), 0); |
f0690a25 | 3182 | break; |
131c7d12 BJS |
3183 | case SRC_TRY_WAIT: |
3184 | case SRC_TRY_DEBOUNCE: | |
3185 | /* Do nothing, waiting for sink detection */ | |
3186 | break; | |
f0690a25 GR |
3187 | default: |
3188 | if (port->pwr_role == TYPEC_SINK && | |
3189 | port->attached) | |
3190 | tcpm_set_state(port, SNK_UNATTACHED, 0); | |
3191 | break; | |
3192 | } | |
3193 | } | |
3194 | ||
3195 | static void _tcpm_pd_hard_reset(struct tcpm_port *port) | |
3196 | { | |
3197 | tcpm_log_force(port, "Received hard reset"); | |
3198 | /* | |
3199 | * If we keep receiving hard reset requests, executing the hard reset | |
3200 | * must have failed. Revert to error recovery if that happens. | |
3201 | */ | |
3202 | tcpm_set_state(port, | |
3203 | port->hard_reset_count < PD_N_HARD_RESET_COUNT ? | |
3204 | HARD_RESET_START : ERROR_RECOVERY, | |
3205 | 0); | |
3206 | } | |
3207 | ||
3208 | static void tcpm_pd_event_handler(struct work_struct *work) | |
3209 | { | |
3210 | struct tcpm_port *port = container_of(work, struct tcpm_port, | |
3211 | event_work); | |
3212 | u32 events; | |
3213 | ||
3214 | mutex_lock(&port->lock); | |
3215 | ||
3216 | spin_lock(&port->pd_event_lock); | |
3217 | while (port->pd_events) { | |
3218 | events = port->pd_events; | |
3219 | port->pd_events = 0; | |
3220 | spin_unlock(&port->pd_event_lock); | |
3221 | if (events & TCPM_RESET_EVENT) | |
3222 | _tcpm_pd_hard_reset(port); | |
3223 | if (events & TCPM_VBUS_EVENT) { | |
3224 | bool vbus; | |
3225 | ||
3226 | vbus = port->tcpc->get_vbus(port->tcpc); | |
3227 | if (vbus) | |
3228 | _tcpm_pd_vbus_on(port); | |
3229 | else | |
3230 | _tcpm_pd_vbus_off(port); | |
3231 | } | |
3232 | if (events & TCPM_CC_EVENT) { | |
3233 | enum typec_cc_status cc1, cc2; | |
3234 | ||
3235 | if (port->tcpc->get_cc(port->tcpc, &cc1, &cc2) == 0) | |
3236 | _tcpm_cc_change(port, cc1, cc2); | |
3237 | } | |
3238 | spin_lock(&port->pd_event_lock); | |
3239 | } | |
3240 | spin_unlock(&port->pd_event_lock); | |
3241 | mutex_unlock(&port->lock); | |
3242 | } | |
3243 | ||
3244 | void tcpm_cc_change(struct tcpm_port *port) | |
3245 | { | |
3246 | spin_lock(&port->pd_event_lock); | |
3247 | port->pd_events |= TCPM_CC_EVENT; | |
3248 | spin_unlock(&port->pd_event_lock); | |
3249 | queue_work(port->wq, &port->event_work); | |
3250 | } | |
3251 | EXPORT_SYMBOL_GPL(tcpm_cc_change); | |
3252 | ||
3253 | void tcpm_vbus_change(struct tcpm_port *port) | |
3254 | { | |
3255 | spin_lock(&port->pd_event_lock); | |
3256 | port->pd_events |= TCPM_VBUS_EVENT; | |
3257 | spin_unlock(&port->pd_event_lock); | |
3258 | queue_work(port->wq, &port->event_work); | |
3259 | } | |
3260 | EXPORT_SYMBOL_GPL(tcpm_vbus_change); | |
3261 | ||
3262 | void tcpm_pd_hard_reset(struct tcpm_port *port) | |
3263 | { | |
3264 | spin_lock(&port->pd_event_lock); | |
3265 | port->pd_events = TCPM_RESET_EVENT; | |
3266 | spin_unlock(&port->pd_event_lock); | |
3267 | queue_work(port->wq, &port->event_work); | |
3268 | } | |
3269 | EXPORT_SYMBOL_GPL(tcpm_pd_hard_reset); | |
3270 | ||
3271 | static int tcpm_dr_set(const struct typec_capability *cap, | |
3272 | enum typec_data_role data) | |
3273 | { | |
3274 | struct tcpm_port *port = typec_cap_to_tcpm(cap); | |
3275 | int ret; | |
3276 | ||
3277 | mutex_lock(&port->swap_lock); | |
3278 | mutex_lock(&port->lock); | |
3279 | ||
9b0ae699 | 3280 | if (port->port_type != TYPEC_PORT_DRP) { |
f0690a25 GR |
3281 | ret = -EINVAL; |
3282 | goto port_unlock; | |
3283 | } | |
3284 | if (port->state != SRC_READY && port->state != SNK_READY) { | |
3285 | ret = -EAGAIN; | |
3286 | goto port_unlock; | |
3287 | } | |
3288 | ||
3289 | if (port->data_role == data) { | |
3290 | ret = 0; | |
3291 | goto port_unlock; | |
3292 | } | |
3293 | ||
3294 | /* | |
3295 | * XXX | |
3296 | * 6.3.9: If an alternate mode is active, a request to swap | |
3297 | * alternate modes shall trigger a port reset. | |
3298 | * Reject data role swap request in this case. | |
3299 | */ | |
3300 | ||
b17dd571 GR |
3301 | if (!port->pd_capable) { |
3302 | /* | |
3303 | * If the partner is not PD capable, reset the port to | |
3304 | * trigger a role change. This can only work if a preferred | |
3305 | * role is configured, and if it matches the requested role. | |
3306 | */ | |
3307 | if (port->try_role == TYPEC_NO_PREFERRED_ROLE || | |
3308 | port->try_role == port->pwr_role) { | |
3309 | ret = -EINVAL; | |
3310 | goto port_unlock; | |
3311 | } | |
3312 | port->non_pd_role_swap = true; | |
3313 | tcpm_set_state(port, PORT_RESET, 0); | |
3314 | } else { | |
3315 | tcpm_set_state(port, DR_SWAP_SEND, 0); | |
3316 | } | |
3317 | ||
f0690a25 GR |
3318 | port->swap_status = 0; |
3319 | port->swap_pending = true; | |
3320 | reinit_completion(&port->swap_complete); | |
f0690a25 GR |
3321 | mutex_unlock(&port->lock); |
3322 | ||
9adf9f9e GR |
3323 | if (!wait_for_completion_timeout(&port->swap_complete, |
3324 | msecs_to_jiffies(PD_ROLE_SWAP_TIMEOUT))) | |
3325 | ret = -ETIMEDOUT; | |
3326 | else | |
3327 | ret = port->swap_status; | |
f0690a25 | 3328 | |
b17dd571 | 3329 | port->non_pd_role_swap = false; |
f0690a25 GR |
3330 | goto swap_unlock; |
3331 | ||
3332 | port_unlock: | |
3333 | mutex_unlock(&port->lock); | |
3334 | swap_unlock: | |
3335 | mutex_unlock(&port->swap_lock); | |
3336 | return ret; | |
3337 | } | |
3338 | ||
3339 | static int tcpm_pr_set(const struct typec_capability *cap, | |
3340 | enum typec_role role) | |
3341 | { | |
3342 | struct tcpm_port *port = typec_cap_to_tcpm(cap); | |
3343 | int ret; | |
3344 | ||
3345 | mutex_lock(&port->swap_lock); | |
3346 | mutex_lock(&port->lock); | |
3347 | ||
9b0ae699 | 3348 | if (port->port_type != TYPEC_PORT_DRP) { |
f0690a25 GR |
3349 | ret = -EINVAL; |
3350 | goto port_unlock; | |
3351 | } | |
3352 | if (port->state != SRC_READY && port->state != SNK_READY) { | |
3353 | ret = -EAGAIN; | |
3354 | goto port_unlock; | |
3355 | } | |
3356 | ||
3357 | if (role == port->pwr_role) { | |
3358 | ret = 0; | |
3359 | goto port_unlock; | |
3360 | } | |
3361 | ||
f0690a25 GR |
3362 | port->swap_status = 0; |
3363 | port->swap_pending = true; | |
3364 | reinit_completion(&port->swap_complete); | |
3365 | tcpm_set_state(port, PR_SWAP_SEND, 0); | |
3366 | mutex_unlock(&port->lock); | |
3367 | ||
9adf9f9e GR |
3368 | if (!wait_for_completion_timeout(&port->swap_complete, |
3369 | msecs_to_jiffies(PD_ROLE_SWAP_TIMEOUT))) | |
3370 | ret = -ETIMEDOUT; | |
3371 | else | |
3372 | ret = port->swap_status; | |
f0690a25 | 3373 | |
f0690a25 GR |
3374 | goto swap_unlock; |
3375 | ||
3376 | port_unlock: | |
3377 | mutex_unlock(&port->lock); | |
3378 | swap_unlock: | |
3379 | mutex_unlock(&port->swap_lock); | |
3380 | return ret; | |
3381 | } | |
3382 | ||
3383 | static int tcpm_vconn_set(const struct typec_capability *cap, | |
3384 | enum typec_role role) | |
3385 | { | |
3386 | struct tcpm_port *port = typec_cap_to_tcpm(cap); | |
3387 | int ret; | |
3388 | ||
3389 | mutex_lock(&port->swap_lock); | |
3390 | mutex_lock(&port->lock); | |
3391 | ||
3392 | if (port->state != SRC_READY && port->state != SNK_READY) { | |
3393 | ret = -EAGAIN; | |
3394 | goto port_unlock; | |
3395 | } | |
3396 | ||
3397 | if (role == port->vconn_role) { | |
3398 | ret = 0; | |
3399 | goto port_unlock; | |
3400 | } | |
3401 | ||
3402 | port->swap_status = 0; | |
3403 | port->swap_pending = true; | |
3404 | reinit_completion(&port->swap_complete); | |
3405 | tcpm_set_state(port, VCONN_SWAP_SEND, 0); | |
3406 | mutex_unlock(&port->lock); | |
3407 | ||
9adf9f9e GR |
3408 | if (!wait_for_completion_timeout(&port->swap_complete, |
3409 | msecs_to_jiffies(PD_ROLE_SWAP_TIMEOUT))) | |
3410 | ret = -ETIMEDOUT; | |
3411 | else | |
3412 | ret = port->swap_status; | |
f0690a25 | 3413 | |
f0690a25 GR |
3414 | goto swap_unlock; |
3415 | ||
3416 | port_unlock: | |
3417 | mutex_unlock(&port->lock); | |
3418 | swap_unlock: | |
3419 | mutex_unlock(&port->swap_lock); | |
3420 | return ret; | |
3421 | } | |
3422 | ||
3423 | static int tcpm_try_role(const struct typec_capability *cap, int role) | |
3424 | { | |
3425 | struct tcpm_port *port = typec_cap_to_tcpm(cap); | |
3426 | struct tcpc_dev *tcpc = port->tcpc; | |
3427 | int ret = 0; | |
3428 | ||
3429 | mutex_lock(&port->lock); | |
3430 | if (tcpc->try_role) | |
3431 | ret = tcpc->try_role(tcpc, role); | |
3432 | if (!ret && !tcpc->config->try_role_hw) | |
3433 | port->try_role = role; | |
3434 | port->try_src_count = 0; | |
3435 | port->try_snk_count = 0; | |
3436 | mutex_unlock(&port->lock); | |
3437 | ||
3438 | return ret; | |
3439 | } | |
3440 | ||
3441 | static void tcpm_init(struct tcpm_port *port) | |
3442 | { | |
3443 | enum typec_cc_status cc1, cc2; | |
3444 | ||
3445 | port->tcpc->init(port->tcpc); | |
3446 | ||
3447 | tcpm_reset_port(port); | |
3448 | ||
3449 | /* | |
3450 | * XXX | |
3451 | * Should possibly wait for VBUS to settle if it was enabled locally | |
3452 | * since tcpm_reset_port() will disable VBUS. | |
3453 | */ | |
3454 | port->vbus_present = port->tcpc->get_vbus(port->tcpc); | |
3455 | if (port->vbus_present) | |
3456 | port->vbus_never_low = true; | |
3457 | ||
3458 | tcpm_set_state(port, tcpm_default_state(port), 0); | |
3459 | ||
3460 | if (port->tcpc->get_cc(port->tcpc, &cc1, &cc2) == 0) | |
3461 | _tcpm_cc_change(port, cc1, cc2); | |
3462 | ||
3463 | /* | |
3464 | * Some adapters need a clean slate at startup, and won't recover | |
3465 | * otherwise. So do not try to be fancy and force a clean disconnect. | |
3466 | */ | |
b17dd571 | 3467 | tcpm_set_state(port, PORT_RESET, 0); |
f0690a25 GR |
3468 | } |
3469 | ||
9b0ae699 BJS |
3470 | static int tcpm_port_type_set(const struct typec_capability *cap, |
3471 | enum typec_port_type type) | |
3472 | { | |
3473 | struct tcpm_port *port = typec_cap_to_tcpm(cap); | |
3474 | ||
3475 | mutex_lock(&port->lock); | |
3476 | if (type == port->port_type) | |
3477 | goto port_unlock; | |
3478 | ||
3479 | port->port_type = type; | |
3480 | ||
3481 | if (!port->connected) { | |
3482 | tcpm_set_state(port, PORT_RESET, 0); | |
3483 | } else if (type == TYPEC_PORT_UFP) { | |
3484 | if (!(port->pwr_role == TYPEC_SINK && | |
3485 | port->data_role == TYPEC_DEVICE)) | |
3486 | tcpm_set_state(port, PORT_RESET, 0); | |
3487 | } else if (type == TYPEC_PORT_DFP) { | |
3488 | if (!(port->pwr_role == TYPEC_SOURCE && | |
3489 | port->data_role == TYPEC_HOST)) | |
3490 | tcpm_set_state(port, PORT_RESET, 0); | |
3491 | } | |
3492 | ||
3493 | port_unlock: | |
3494 | mutex_unlock(&port->lock); | |
3495 | return 0; | |
3496 | } | |
3497 | ||
f0690a25 GR |
3498 | void tcpm_tcpc_reset(struct tcpm_port *port) |
3499 | { | |
3500 | mutex_lock(&port->lock); | |
3501 | /* XXX: Maintain PD connection if possible? */ | |
3502 | tcpm_init(port); | |
3503 | mutex_unlock(&port->lock); | |
3504 | } | |
3505 | EXPORT_SYMBOL_GPL(tcpm_tcpc_reset); | |
3506 | ||
3507 | static int tcpm_copy_pdos(u32 *dest_pdo, const u32 *src_pdo, | |
3508 | unsigned int nr_pdo) | |
3509 | { | |
3510 | unsigned int i; | |
3511 | ||
3512 | if (nr_pdo > PDO_MAX_OBJECTS) | |
3513 | nr_pdo = PDO_MAX_OBJECTS; | |
3514 | ||
3515 | for (i = 0; i < nr_pdo; i++) | |
3516 | dest_pdo[i] = src_pdo[i]; | |
3517 | ||
3518 | return nr_pdo; | |
3519 | } | |
3520 | ||
193a6801 GR |
3521 | static int tcpm_copy_vdos(u32 *dest_vdo, const u32 *src_vdo, |
3522 | unsigned int nr_vdo) | |
3523 | { | |
3524 | unsigned int i; | |
3525 | ||
3526 | if (nr_vdo > VDO_MAX_OBJECTS) | |
3527 | nr_vdo = VDO_MAX_OBJECTS; | |
3528 | ||
3529 | for (i = 0; i < nr_vdo; i++) | |
3530 | dest_vdo[i] = src_vdo[i]; | |
3531 | ||
3532 | return nr_vdo; | |
3533 | } | |
3534 | ||
5007e1b5 BJS |
3535 | int tcpm_update_source_capabilities(struct tcpm_port *port, const u32 *pdo, |
3536 | unsigned int nr_pdo) | |
f0690a25 | 3537 | { |
5007e1b5 BJS |
3538 | if (tcpm_validate_caps(port, pdo, nr_pdo)) |
3539 | return -EINVAL; | |
3540 | ||
f0690a25 GR |
3541 | mutex_lock(&port->lock); |
3542 | port->nr_src_pdo = tcpm_copy_pdos(port->src_pdo, pdo, nr_pdo); | |
3543 | switch (port->state) { | |
3544 | case SRC_UNATTACHED: | |
3545 | case SRC_ATTACH_WAIT: | |
3546 | case SRC_TRYWAIT: | |
3547 | tcpm_set_cc(port, tcpm_rp_cc(port)); | |
3548 | break; | |
3549 | case SRC_SEND_CAPABILITIES: | |
3550 | case SRC_NEGOTIATE_CAPABILITIES: | |
3551 | case SRC_READY: | |
3552 | case SRC_WAIT_NEW_CAPABILITIES: | |
3553 | tcpm_set_cc(port, tcpm_rp_cc(port)); | |
3554 | tcpm_set_state(port, SRC_SEND_CAPABILITIES, 0); | |
3555 | break; | |
3556 | default: | |
3557 | break; | |
3558 | } | |
3559 | mutex_unlock(&port->lock); | |
5007e1b5 | 3560 | return 0; |
f0690a25 GR |
3561 | } |
3562 | EXPORT_SYMBOL_GPL(tcpm_update_source_capabilities); | |
3563 | ||
5007e1b5 BJS |
3564 | int tcpm_update_sink_capabilities(struct tcpm_port *port, const u32 *pdo, |
3565 | unsigned int nr_pdo, | |
3566 | unsigned int max_snk_mv, | |
3567 | unsigned int max_snk_ma, | |
3568 | unsigned int max_snk_mw, | |
3569 | unsigned int operating_snk_mw) | |
f0690a25 | 3570 | { |
5007e1b5 BJS |
3571 | if (tcpm_validate_caps(port, pdo, nr_pdo)) |
3572 | return -EINVAL; | |
3573 | ||
f0690a25 GR |
3574 | mutex_lock(&port->lock); |
3575 | port->nr_snk_pdo = tcpm_copy_pdos(port->snk_pdo, pdo, nr_pdo); | |
3576 | port->max_snk_mv = max_snk_mv; | |
3577 | port->max_snk_ma = max_snk_ma; | |
3578 | port->max_snk_mw = max_snk_mw; | |
3579 | port->operating_snk_mw = operating_snk_mw; | |
3580 | ||
3581 | switch (port->state) { | |
3582 | case SNK_NEGOTIATE_CAPABILITIES: | |
3583 | case SNK_READY: | |
3584 | case SNK_TRANSITION_SINK: | |
3585 | case SNK_TRANSITION_SINK_VBUS: | |
3586 | tcpm_set_state(port, SNK_NEGOTIATE_CAPABILITIES, 0); | |
3587 | break; | |
3588 | default: | |
3589 | break; | |
3590 | } | |
3591 | mutex_unlock(&port->lock); | |
5007e1b5 | 3592 | return 0; |
f0690a25 GR |
3593 | } |
3594 | EXPORT_SYMBOL_GPL(tcpm_update_sink_capabilities); | |
3595 | ||
3596 | struct tcpm_port *tcpm_register_port(struct device *dev, struct tcpc_dev *tcpc) | |
3597 | { | |
3598 | struct tcpm_port *port; | |
3599 | int i, err; | |
3600 | ||
3601 | if (!dev || !tcpc || !tcpc->config || | |
3602 | !tcpc->get_vbus || !tcpc->set_cc || !tcpc->get_cc || | |
3603 | !tcpc->set_polarity || !tcpc->set_vconn || !tcpc->set_vbus || | |
3604 | !tcpc->set_pd_rx || !tcpc->set_roles || !tcpc->pd_transmit) | |
3605 | return ERR_PTR(-EINVAL); | |
3606 | ||
3607 | port = devm_kzalloc(dev, sizeof(*port), GFP_KERNEL); | |
3608 | if (!port) | |
3609 | return ERR_PTR(-ENOMEM); | |
3610 | ||
3611 | port->dev = dev; | |
3612 | port->tcpc = tcpc; | |
3613 | ||
3614 | mutex_init(&port->lock); | |
3615 | mutex_init(&port->swap_lock); | |
3616 | ||
3617 | port->wq = create_singlethread_workqueue(dev_name(dev)); | |
3618 | if (!port->wq) | |
3619 | return ERR_PTR(-ENOMEM); | |
3620 | INIT_DELAYED_WORK(&port->state_machine, tcpm_state_machine_work); | |
3621 | INIT_DELAYED_WORK(&port->vdm_state_machine, vdm_state_machine_work); | |
3622 | INIT_WORK(&port->event_work, tcpm_pd_event_handler); | |
3623 | ||
3624 | spin_lock_init(&port->pd_event_lock); | |
3625 | ||
3626 | init_completion(&port->tx_complete); | |
3627 | init_completion(&port->swap_complete); | |
5007e1b5 | 3628 | tcpm_debugfs_init(port); |
f0690a25 | 3629 | |
5007e1b5 BJS |
3630 | if (tcpm_validate_caps(port, tcpc->config->src_pdo, |
3631 | tcpc->config->nr_src_pdo) || | |
3632 | tcpm_validate_caps(port, tcpc->config->snk_pdo, | |
3633 | tcpc->config->nr_snk_pdo)) { | |
3634 | err = -EINVAL; | |
3635 | goto out_destroy_wq; | |
3636 | } | |
f0690a25 GR |
3637 | port->nr_src_pdo = tcpm_copy_pdos(port->src_pdo, tcpc->config->src_pdo, |
3638 | tcpc->config->nr_src_pdo); | |
3639 | port->nr_snk_pdo = tcpm_copy_pdos(port->snk_pdo, tcpc->config->snk_pdo, | |
3640 | tcpc->config->nr_snk_pdo); | |
193a6801 GR |
3641 | port->nr_snk_vdo = tcpm_copy_vdos(port->snk_vdo, tcpc->config->snk_vdo, |
3642 | tcpc->config->nr_snk_vdo); | |
f0690a25 GR |
3643 | |
3644 | port->max_snk_mv = tcpc->config->max_snk_mv; | |
3645 | port->max_snk_ma = tcpc->config->max_snk_ma; | |
3646 | port->max_snk_mw = tcpc->config->max_snk_mw; | |
3647 | port->operating_snk_mw = tcpc->config->operating_snk_mw; | |
3648 | if (!tcpc->config->try_role_hw) | |
3649 | port->try_role = tcpc->config->default_role; | |
3650 | else | |
3651 | port->try_role = TYPEC_NO_PREFERRED_ROLE; | |
3652 | ||
3653 | port->typec_caps.prefer_role = tcpc->config->default_role; | |
3654 | port->typec_caps.type = tcpc->config->type; | |
3655 | port->typec_caps.revision = 0x0120; /* Type-C spec release 1.2 */ | |
3656 | port->typec_caps.pd_revision = 0x0200; /* USB-PD spec release 2.0 */ | |
3657 | port->typec_caps.dr_set = tcpm_dr_set; | |
3658 | port->typec_caps.pr_set = tcpm_pr_set; | |
3659 | port->typec_caps.vconn_set = tcpm_vconn_set; | |
3660 | port->typec_caps.try_role = tcpm_try_role; | |
9b0ae699 | 3661 | port->typec_caps.port_type_set = tcpm_port_type_set; |
f0690a25 GR |
3662 | |
3663 | port->partner_desc.identity = &port->partner_ident; | |
9b0ae699 | 3664 | port->port_type = tcpc->config->type; |
f0690a25 GR |
3665 | |
3666 | port->typec_port = typec_register_port(port->dev, &port->typec_caps); | |
3667 | if (!port->typec_port) { | |
3668 | err = -ENOMEM; | |
3669 | goto out_destroy_wq; | |
3670 | } | |
3671 | ||
3672 | if (tcpc->config->alt_modes) { | |
3c41dbde | 3673 | const struct typec_altmode_desc *paltmode = tcpc->config->alt_modes; |
f0690a25 GR |
3674 | |
3675 | i = 0; | |
3676 | while (paltmode->svid && i < ARRAY_SIZE(port->port_altmode)) { | |
3677 | port->port_altmode[i] = | |
3678 | typec_port_register_altmode(port->typec_port, | |
3679 | paltmode); | |
3680 | if (!port->port_altmode[i]) { | |
3681 | tcpm_log(port, | |
3682 | "%s: failed to register port alternate mode 0x%x", | |
3683 | dev_name(dev), paltmode->svid); | |
3684 | break; | |
3685 | } | |
3686 | i++; | |
3687 | paltmode++; | |
3688 | } | |
3689 | } | |
3690 | ||
f0690a25 GR |
3691 | mutex_lock(&port->lock); |
3692 | tcpm_init(port); | |
3693 | mutex_unlock(&port->lock); | |
3694 | ||
3695 | tcpm_log(port, "%s: registered", dev_name(dev)); | |
3696 | return port; | |
3697 | ||
3698 | out_destroy_wq: | |
3699 | destroy_workqueue(port->wq); | |
3700 | return ERR_PTR(err); | |
3701 | } | |
3702 | EXPORT_SYMBOL_GPL(tcpm_register_port); | |
3703 | ||
3704 | void tcpm_unregister_port(struct tcpm_port *port) | |
3705 | { | |
3706 | int i; | |
3707 | ||
a6d5d230 | 3708 | tcpm_reset_port(port); |
f0690a25 GR |
3709 | for (i = 0; i < ARRAY_SIZE(port->port_altmode); i++) |
3710 | typec_unregister_altmode(port->port_altmode[i]); | |
3711 | typec_unregister_port(port->typec_port); | |
3712 | tcpm_debugfs_exit(port); | |
3713 | destroy_workqueue(port->wq); | |
3714 | } | |
3715 | EXPORT_SYMBOL_GPL(tcpm_unregister_port); | |
3716 | ||
3717 | MODULE_AUTHOR("Guenter Roeck <groeck@chromium.org>"); | |
3718 | MODULE_DESCRIPTION("USB Type-C Port Manager"); | |
3719 | MODULE_LICENSE("GPL"); |