1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * cec-adap.c - HDMI Consumer Electronics Control framework - CEC adapter |
4 | * |
5 | * Copyright 2016 Cisco Systems, Inc. and/or its affiliates. All rights reserved. |
6 | */ |
7 | |
8 | #include <linux/errno.h> |
9 | #include <linux/init.h> |
10 | #include <linux/module.h> |
11 | #include <linux/kernel.h> |
12 | #include <linux/kmod.h> |
13 | #include <linux/ktime.h> |
14 | #include <linux/slab.h> |
15 | #include <linux/mm.h> |
16 | #include <linux/string.h> |
17 | #include <linux/types.h> |
18 | |
19 | #include <drm/drm_connector.h> |
20 | #include <drm/drm_device.h> |
21 | #include <drm/drm_edid.h> |
22 | #include <drm/drm_file.h> |
23 | |
24 | #include "cec-priv.h" |
25 | |
26 | static void cec_fill_msg_report_features(struct cec_adapter *adap, |
27 | struct cec_msg *msg, |
28 | unsigned int la_idx); |
29 | |
30 | static int cec_log_addr2idx(const struct cec_adapter *adap, u8 log_addr) |
31 | { |
32 | int i; |
33 | |
34 | for (i = 0; i < adap->log_addrs.num_log_addrs; i++) |
35 | if (adap->log_addrs.log_addr[i] == log_addr) |
36 | return i; |
37 | return -1; |
38 | } |
39 | |
40 | static unsigned int cec_log_addr2dev(const struct cec_adapter *adap, u8 log_addr) |
41 | { |
42 | int i = cec_log_addr2idx(adap, log_addr); |
43 | |
44 | return adap->log_addrs.primary_device_type[i < 0 ? 0 : i]; |
45 | } |
46 | |
47 | u16 cec_get_edid_phys_addr(const u8 *edid, unsigned int size, |
48 | unsigned int *offset) |
49 | { |
50 | unsigned int loc = cec_get_edid_spa_location(edid, size); |
51 | |
52 | if (offset) |
53 | *offset = loc; |
54 | if (loc == 0) |
55 | return CEC_PHYS_ADDR_INVALID; |
56 | return (edid[loc] << 8) | edid[loc + 1]; |
57 | } |
58 | EXPORT_SYMBOL_GPL(cec_get_edid_phys_addr); |
59 | |
60 | void cec_fill_conn_info_from_drm(struct cec_connector_info *conn_info, |
61 | const struct drm_connector *connector) |
62 | { |
63 | memset(conn_info, 0, sizeof(*conn_info)); |
64 | conn_info->type = CEC_CONNECTOR_TYPE_DRM; |
65 | conn_info->drm.card_no = connector->dev->primary->index; |
66 | conn_info->drm.connector_id = connector->base.id; |
67 | } |
68 | EXPORT_SYMBOL_GPL(cec_fill_conn_info_from_drm); |
69 | |
70 | /* |
71 | * Queue a new event for this filehandle. If ts == 0, then set it |
72 | * to the current time. |
73 | * |
74 | * We keep a queue of at most max_event events where max_event differs |
75 | * per event. If the queue becomes full, then drop the oldest event and |
76 | * keep track of how many events we've dropped. |
77 | */ |
78 | void cec_queue_event_fh(struct cec_fh *fh, |
79 | const struct cec_event *new_ev, u64 ts) |
80 | { |
81 | static const u16 max_events[CEC_NUM_EVENTS] = { |
82 | 1, 1, 800, 800, 8, 8, 8, 8 |
83 | }; |
84 | struct cec_event_entry *entry; |
85 | unsigned int ev_idx = new_ev->event - 1; |
86 | |
87 | if (WARN_ON(ev_idx >= ARRAY_SIZE(fh->events))) |
88 | return; |
89 | |
90 | if (ts == 0) |
91 | ts = ktime_get_ns(); |
92 | |
93 | mutex_lock(&fh->lock); |
94 | if (ev_idx < CEC_NUM_CORE_EVENTS) |
95 | entry = &fh->core_events[ev_idx]; |
96 | else |
97 | entry = kmalloc(size: sizeof(*entry), GFP_KERNEL); |
98 | if (entry) { |
99 | if (new_ev->event == CEC_EVENT_LOST_MSGS && |
100 | fh->queued_events[ev_idx]) { |
101 | entry->ev.lost_msgs.lost_msgs += |
102 | new_ev->lost_msgs.lost_msgs; |
103 | goto unlock; |
104 | } |
105 | entry->ev = *new_ev; |
106 | entry->ev.ts = ts; |
107 | |
108 | if (fh->queued_events[ev_idx] < max_events[ev_idx]) { |
109 | /* Add new msg at the end of the queue */ |
110 | list_add_tail(new: &entry->list, head: &fh->events[ev_idx]); |
111 | fh->queued_events[ev_idx]++; |
112 | fh->total_queued_events++; |
113 | goto unlock; |
114 | } |
115 | |
116 | if (ev_idx >= CEC_NUM_CORE_EVENTS) { |
117 | list_add_tail(new: &entry->list, head: &fh->events[ev_idx]); |
118 | /* drop the oldest event */ |
119 | entry = list_first_entry(&fh->events[ev_idx], |
120 | struct cec_event_entry, list); |
121 | list_del(entry: &entry->list); |
122 | kfree(objp: entry); |
123 | } |
124 | } |
125 | /* Mark that events were lost */ |
126 | entry = list_first_entry_or_null(&fh->events[ev_idx], |
127 | struct cec_event_entry, list); |
128 | if (entry) |
129 | entry->ev.flags |= CEC_EVENT_FL_DROPPED_EVENTS; |
130 | |
131 | unlock: |
132 | mutex_unlock(lock: &fh->lock); |
133 | wake_up_interruptible(&fh->wait); |
134 | } |
135 | |
136 | /* Queue a new event for all open filehandles. */ |
137 | static void cec_queue_event(struct cec_adapter *adap, |
138 | const struct cec_event *ev) |
139 | { |
140 | u64 ts = ktime_get_ns(); |
141 | struct cec_fh *fh; |
142 | |
143 | mutex_lock(&adap->devnode.lock_fhs); |
144 | list_for_each_entry(fh, &adap->devnode.fhs, list) |
145 | cec_queue_event_fh(fh, new_ev: ev, ts); |
146 | mutex_unlock(lock: &adap->devnode.lock_fhs); |
147 | } |
148 | |
149 | /* Notify userspace that the CEC pin changed state at the given time. */ |
150 | void cec_queue_pin_cec_event(struct cec_adapter *adap, bool is_high, |
151 | bool dropped_events, ktime_t ts) |
152 | { |
153 | struct cec_event ev = { |
154 | .event = is_high ? CEC_EVENT_PIN_CEC_HIGH : |
155 | CEC_EVENT_PIN_CEC_LOW, |
156 | .flags = dropped_events ? CEC_EVENT_FL_DROPPED_EVENTS : 0, |
157 | }; |
158 | struct cec_fh *fh; |
159 | |
160 | mutex_lock(&adap->devnode.lock_fhs); |
161 | list_for_each_entry(fh, &adap->devnode.fhs, list) { |
162 | if (fh->mode_follower == CEC_MODE_MONITOR_PIN) |
163 | cec_queue_event_fh(fh, new_ev: &ev, ts: ktime_to_ns(kt: ts)); |
164 | } |
165 | mutex_unlock(lock: &adap->devnode.lock_fhs); |
166 | } |
167 | EXPORT_SYMBOL_GPL(cec_queue_pin_cec_event); |
168 | |
169 | /* Notify userspace that the HPD pin changed state at the given time. */ |
170 | void cec_queue_pin_hpd_event(struct cec_adapter *adap, bool is_high, ktime_t ts) |
171 | { |
172 | struct cec_event ev = { |
173 | .event = is_high ? CEC_EVENT_PIN_HPD_HIGH : |
174 | CEC_EVENT_PIN_HPD_LOW, |
175 | }; |
176 | struct cec_fh *fh; |
177 | |
178 | mutex_lock(&adap->devnode.lock_fhs); |
179 | list_for_each_entry(fh, &adap->devnode.fhs, list) |
180 | cec_queue_event_fh(fh, new_ev: &ev, ts: ktime_to_ns(kt: ts)); |
181 | mutex_unlock(lock: &adap->devnode.lock_fhs); |
182 | } |
183 | EXPORT_SYMBOL_GPL(cec_queue_pin_hpd_event); |
184 | |
185 | /* Notify userspace that the 5V pin changed state at the given time. */ |
186 | void cec_queue_pin_5v_event(struct cec_adapter *adap, bool is_high, ktime_t ts) |
187 | { |
188 | struct cec_event ev = { |
189 | .event = is_high ? CEC_EVENT_PIN_5V_HIGH : |
190 | CEC_EVENT_PIN_5V_LOW, |
191 | }; |
192 | struct cec_fh *fh; |
193 | |
194 | mutex_lock(&adap->devnode.lock_fhs); |
195 | list_for_each_entry(fh, &adap->devnode.fhs, list) |
196 | cec_queue_event_fh(fh, new_ev: &ev, ts: ktime_to_ns(kt: ts)); |
197 | mutex_unlock(lock: &adap->devnode.lock_fhs); |
198 | } |
199 | EXPORT_SYMBOL_GPL(cec_queue_pin_5v_event); |
200 | |
201 | /* |
202 | * Queue a new message for this filehandle. |
203 | * |
204 | * We keep a queue of at most CEC_MAX_MSG_RX_QUEUE_SZ messages. If the |
205 | * queue becomes full, then drop the oldest message and keep track |
206 | * of how many messages we've dropped. |
207 | */ |
208 | static void cec_queue_msg_fh(struct cec_fh *fh, const struct cec_msg *msg) |
209 | { |
210 | static const struct cec_event ev_lost_msgs = { |
211 | .event = CEC_EVENT_LOST_MSGS, |
212 | .flags = 0, |
213 | { |
214 | .lost_msgs = { 1 }, |
215 | }, |
216 | }; |
217 | struct cec_msg_entry *entry; |
218 | |
219 | mutex_lock(&fh->lock); |
220 | entry = kmalloc(size: sizeof(*entry), GFP_KERNEL); |
221 | if (entry) { |
222 | entry->msg = *msg; |
223 | /* Add new msg at the end of the queue */ |
224 | list_add_tail(new: &entry->list, head: &fh->msgs); |
225 | |
226 | if (fh->queued_msgs < CEC_MAX_MSG_RX_QUEUE_SZ) { |
227 | /* All is fine if there is enough room */ |
228 | fh->queued_msgs++; |
229 | mutex_unlock(lock: &fh->lock); |
230 | wake_up_interruptible(&fh->wait); |
231 | return; |
232 | } |
233 | |
234 | /* |
235 | * if the message queue is full, then drop the oldest one and |
236 | * send a lost message event. |
237 | */ |
238 | entry = list_first_entry(&fh->msgs, struct cec_msg_entry, list); |
239 | list_del(entry: &entry->list); |
240 | kfree(objp: entry); |
241 | } |
242 | mutex_unlock(lock: &fh->lock); |
243 | |
244 | /* |
245 | * We lost a message, either because kmalloc failed or the queue |
246 | * was full. |
247 | */ |
248 | cec_queue_event_fh(fh, new_ev: &ev_lost_msgs, ts: ktime_get_ns()); |
249 | } |
250 | |
251 | /* |
252 | * Queue the message for those filehandles that are in monitor mode. |
253 | * If valid_la is true (this message is for us or was sent by us), |
254 | * then pass it on to any monitoring filehandle. If this message |
255 | * isn't for us or from us, then only give it to filehandles that |
256 | * are in MONITOR_ALL mode. |
257 | * |
258 | * This can only happen if the CEC_CAP_MONITOR_ALL capability is |
259 | * set and the CEC adapter was placed in 'monitor all' mode. |
260 | */ |
261 | static void cec_queue_msg_monitor(struct cec_adapter *adap, |
262 | const struct cec_msg *msg, |
263 | bool valid_la) |
264 | { |
265 | struct cec_fh *fh; |
266 | u32 monitor_mode = valid_la ? CEC_MODE_MONITOR : |
267 | CEC_MODE_MONITOR_ALL; |
268 | |
269 | mutex_lock(&adap->devnode.lock_fhs); |
270 | list_for_each_entry(fh, &adap->devnode.fhs, list) { |
271 | if (fh->mode_follower >= monitor_mode) |
272 | cec_queue_msg_fh(fh, msg); |
273 | } |
274 | mutex_unlock(lock: &adap->devnode.lock_fhs); |
275 | } |
276 | |
277 | /* |
278 | * Queue the message for follower filehandles. |
279 | */ |
280 | static void cec_queue_msg_followers(struct cec_adapter *adap, |
281 | const struct cec_msg *msg) |
282 | { |
283 | struct cec_fh *fh; |
284 | |
285 | mutex_lock(&adap->devnode.lock_fhs); |
286 | list_for_each_entry(fh, &adap->devnode.fhs, list) { |
287 | if (fh->mode_follower == CEC_MODE_FOLLOWER) |
288 | cec_queue_msg_fh(fh, msg); |
289 | } |
290 | mutex_unlock(lock: &adap->devnode.lock_fhs); |
291 | } |
292 | |
293 | /* Notify userspace of an adapter state change. */ |
294 | static void cec_post_state_event(struct cec_adapter *adap) |
295 | { |
296 | struct cec_event ev = { |
297 | .event = CEC_EVENT_STATE_CHANGE, |
298 | }; |
299 | |
300 | ev.state_change.phys_addr = adap->phys_addr; |
301 | ev.state_change.log_addr_mask = adap->log_addrs.log_addr_mask; |
302 | ev.state_change.have_conn_info = |
303 | adap->conn_info.type != CEC_CONNECTOR_TYPE_NO_CONNECTOR; |
304 | cec_queue_event(adap, ev: &ev); |
305 | } |
306 | |
307 | /* |
308 | * A CEC transmit (and a possible wait for reply) completed. |
309 | * If this was in blocking mode, then complete it, otherwise |
310 | * queue the message for userspace to dequeue later. |
311 | * |
312 | * This function is called with adap->lock held. |
313 | */ |
314 | static void cec_data_completed(struct cec_data *data) |
315 | { |
316 | /* |
317 | * Delete this transmit from the filehandle's xfer_list since |
318 | * we're done with it. |
319 | * |
320 | * Note that if the filehandle is closed before this transmit |
321 | * finished, then the release() function will set data->fh to NULL. |
322 | * Without that we would be referring to a closed filehandle. |
323 | */ |
324 | if (data->fh) |
325 | list_del_init(entry: &data->xfer_list); |
326 | |
327 | if (data->blocking) { |
328 | /* |
329 | * Someone is blocking so mark the message as completed |
330 | * and call complete. |
331 | */ |
332 | data->completed = true; |
333 | complete(&data->c); |
334 | } else { |
335 | /* |
336 | * No blocking, so just queue the message if needed and |
337 | * free the memory. |
338 | */ |
339 | if (data->fh) |
340 | cec_queue_msg_fh(fh: data->fh, msg: &data->msg); |
341 | kfree(objp: data); |
342 | } |
343 | } |
344 | |
345 | /* |
346 | * A pending CEC transmit needs to be cancelled, either because the CEC |
347 | * adapter is disabled or the transmit takes an impossibly long time to |
348 | * finish, or the reply timed out. |
349 | * |
350 | * This function is called with adap->lock held. |
351 | */ |
352 | static void cec_data_cancel(struct cec_data *data, u8 tx_status, u8 rx_status) |
353 | { |
354 | struct cec_adapter *adap = data->adap; |
355 | |
356 | /* |
357 | * It's either the current transmit, or it is a pending |
358 | * transmit. Take the appropriate action to clear it. |
359 | */ |
360 | if (adap->transmitting == data) { |
361 | adap->transmitting = NULL; |
362 | } else { |
363 | list_del_init(entry: &data->list); |
364 | if (!(data->msg.tx_status & CEC_TX_STATUS_OK)) |
365 | if (!WARN_ON(!adap->transmit_queue_sz)) |
366 | adap->transmit_queue_sz--; |
367 | } |
368 | |
369 | if (data->msg.tx_status & CEC_TX_STATUS_OK) { |
370 | data->msg.rx_ts = ktime_get_ns(); |
371 | data->msg.rx_status = rx_status; |
372 | if (!data->blocking) |
373 | data->msg.tx_status = 0; |
374 | } else { |
375 | data->msg.tx_ts = ktime_get_ns(); |
376 | data->msg.tx_status |= tx_status | |
377 | CEC_TX_STATUS_MAX_RETRIES; |
378 | data->msg.tx_error_cnt++; |
379 | data->attempts = 0; |
380 | if (!data->blocking) |
381 | data->msg.rx_status = 0; |
382 | } |
383 | |
384 | /* Queue transmitted message for monitoring purposes */ |
385 | cec_queue_msg_monitor(adap, msg: &data->msg, valid_la: 1); |
386 | |
387 | if (!data->blocking && data->msg.sequence) |
388 | /* Allow drivers to react to a canceled transmit */ |
389 | call_void_op(adap, adap_nb_transmit_canceled, &data->msg); |
390 | |
391 | cec_data_completed(data); |
392 | } |
393 | |
394 | /* |
395 | * Flush all pending transmits and cancel any pending timeout work. |
396 | * |
397 | * This function is called with adap->lock held. |
398 | */ |
399 | static void cec_flush(struct cec_adapter *adap) |
400 | { |
401 | struct cec_data *data, *n; |
402 | |
403 | /* |
404 | * If the adapter is disabled, or we're asked to stop, |
405 | * then cancel any pending transmits. |
406 | */ |
407 | while (!list_empty(head: &adap->transmit_queue)) { |
408 | data = list_first_entry(&adap->transmit_queue, |
409 | struct cec_data, list); |
410 | cec_data_cancel(data, CEC_TX_STATUS_ABORTED, rx_status: 0); |
411 | } |
412 | if (adap->transmitting) |
413 | adap->transmit_in_progress_aborted = true; |
414 | |
415 | /* Cancel the pending timeout work. */ |
416 | list_for_each_entry_safe(data, n, &adap->wait_queue, list) { |
417 | if (cancel_delayed_work(dwork: &data->work)) |
418 | cec_data_cancel(data, CEC_TX_STATUS_OK, CEC_RX_STATUS_ABORTED); |
419 | /* |
420 | * If cancel_delayed_work returned false, then |
421 | * the cec_wait_timeout function is running, |
422 | * which will call cec_data_completed. So no |
423 | * need to do anything special in that case. |
424 | */ |
425 | } |
426 | /* |
427 | * If something went wrong and this counter isn't what it should |
428 | * be, then this will reset it back to 0. Warn if it is not 0, |
429 | * since it indicates a bug, either in this framework or in a |
430 | * CEC driver. |
431 | */ |
432 | if (WARN_ON(adap->transmit_queue_sz)) |
433 | adap->transmit_queue_sz = 0; |
434 | } |
435 | |
436 | /* |
437 | * Main CEC state machine |
438 | * |
439 | * Wait until the thread should be stopped, or we are not transmitting and |
440 | * a new transmit message is queued up, in which case we start transmitting |
441 | * that message. When the adapter finished transmitting the message it will |
442 | * call cec_transmit_done(). |
443 | * |
444 | * If the adapter is disabled, then remove all queued messages instead. |
445 | * |
446 | * If the current transmit times out, then cancel that transmit. |
447 | */ |
448 | int cec_thread_func(void *_adap) |
449 | { |
450 | struct cec_adapter *adap = _adap; |
451 | |
452 | for (;;) { |
453 | unsigned int signal_free_time; |
454 | struct cec_data *data; |
455 | bool timeout = false; |
456 | u8 attempts; |
457 | |
458 | if (adap->transmit_in_progress) { |
459 | int err; |
460 | |
461 | /* |
462 | * We are transmitting a message, so add a timeout |
463 | * to prevent the state machine to get stuck waiting |
464 | * for this message to finalize and add a check to |
465 | * see if the adapter is disabled in which case the |
466 | * transmit should be canceled. |
467 | */ |
468 | err = wait_event_interruptible_timeout(adap->kthread_waitq, |
469 | (adap->needs_hpd && |
470 | (!adap->is_configured && !adap->is_configuring)) || |
471 | kthread_should_stop() || |
472 | (!adap->transmit_in_progress && |
473 | !list_empty(&adap->transmit_queue)), |
474 | msecs_to_jiffies(adap->xfer_timeout_ms)); |
475 | timeout = err == 0; |
476 | } else { |
477 | /* Otherwise we just wait for something to happen. */ |
478 | wait_event_interruptible(adap->kthread_waitq, |
479 | kthread_should_stop() || |
480 | (!adap->transmit_in_progress && |
481 | !list_empty(&adap->transmit_queue))); |
482 | } |
483 | |
484 | mutex_lock(&adap->lock); |
485 | |
486 | if ((adap->needs_hpd && |
487 | (!adap->is_configured && !adap->is_configuring)) || |
488 | kthread_should_stop()) { |
489 | cec_flush(adap); |
490 | goto unlock; |
491 | } |
492 | |
493 | if (adap->transmit_in_progress && timeout) { |
494 | /* |
495 | * If we timeout, then log that. Normally this does |
496 | * not happen and it is an indication of a faulty CEC |
497 | * adapter driver, or the CEC bus is in some weird |
498 | * state. On rare occasions it can happen if there is |
499 | * so much traffic on the bus that the adapter was |
500 | * unable to transmit for xfer_timeout_ms (2.1s by |
501 | * default). |
502 | */ |
503 | if (adap->transmitting) { |
504 | pr_warn("cec-%s: message %*ph timed out\n" , adap->name, |
505 | adap->transmitting->msg.len, |
506 | adap->transmitting->msg.msg); |
507 | /* Just give up on this. */ |
508 | cec_data_cancel(data: adap->transmitting, |
509 | CEC_TX_STATUS_TIMEOUT, rx_status: 0); |
510 | } else { |
511 | pr_warn("cec-%s: transmit timed out\n" , adap->name); |
512 | } |
513 | adap->transmit_in_progress = false; |
514 | adap->tx_timeout_cnt++; |
515 | goto unlock; |
516 | } |
517 | |
518 | /* |
519 | * If we are still transmitting, or there is nothing new to |
520 | * transmit, then just continue waiting. |
521 | */ |
522 | if (adap->transmit_in_progress || list_empty(head: &adap->transmit_queue)) |
523 | goto unlock; |
524 | |
525 | /* Get a new message to transmit */ |
526 | data = list_first_entry(&adap->transmit_queue, |
527 | struct cec_data, list); |
528 | list_del_init(entry: &data->list); |
529 | if (!WARN_ON(!data->adap->transmit_queue_sz)) |
530 | adap->transmit_queue_sz--; |
531 | |
532 | /* Make this the current transmitting message */ |
533 | adap->transmitting = data; |
534 | |
535 | /* |
536 | * Suggested number of attempts as per the CEC 2.0 spec: |
537 | * 4 attempts is the default, except for 'secondary poll |
538 | * messages', i.e. poll messages not sent during the adapter |
539 | * configuration phase when it allocates logical addresses. |
540 | */ |
541 | if (data->msg.len == 1 && adap->is_configured) |
542 | attempts = 2; |
543 | else |
544 | attempts = 4; |
545 | |
546 | /* Set the suggested signal free time */ |
547 | if (data->attempts) { |
548 | /* should be >= 3 data bit periods for a retry */ |
549 | signal_free_time = CEC_SIGNAL_FREE_TIME_RETRY; |
550 | } else if (adap->last_initiator != |
551 | cec_msg_initiator(msg: &data->msg)) { |
552 | /* should be >= 5 data bit periods for new initiator */ |
553 | signal_free_time = CEC_SIGNAL_FREE_TIME_NEW_INITIATOR; |
554 | adap->last_initiator = cec_msg_initiator(msg: &data->msg); |
555 | } else { |
556 | /* |
557 | * should be >= 7 data bit periods for sending another |
558 | * frame immediately after another. |
559 | */ |
560 | signal_free_time = CEC_SIGNAL_FREE_TIME_NEXT_XFER; |
561 | } |
562 | if (data->attempts == 0) |
563 | data->attempts = attempts; |
564 | |
565 | adap->transmit_in_progress_aborted = false; |
566 | /* Tell the adapter to transmit, cancel on error */ |
567 | if (call_op(adap, adap_transmit, data->attempts, |
568 | signal_free_time, &data->msg)) |
569 | cec_data_cancel(data, CEC_TX_STATUS_ABORTED, rx_status: 0); |
570 | else |
571 | adap->transmit_in_progress = true; |
572 | |
573 | unlock: |
574 | mutex_unlock(lock: &adap->lock); |
575 | |
576 | if (kthread_should_stop()) |
577 | break; |
578 | } |
579 | return 0; |
580 | } |
581 | |
582 | /* |
583 | * Called by the CEC adapter if a transmit finished. |
584 | */ |
585 | void cec_transmit_done_ts(struct cec_adapter *adap, u8 status, |
586 | u8 arb_lost_cnt, u8 nack_cnt, u8 low_drive_cnt, |
587 | u8 error_cnt, ktime_t ts) |
588 | { |
589 | struct cec_data *data; |
590 | struct cec_msg *msg; |
591 | unsigned int attempts_made = arb_lost_cnt + nack_cnt + |
592 | low_drive_cnt + error_cnt; |
593 | bool done = status & (CEC_TX_STATUS_MAX_RETRIES | CEC_TX_STATUS_OK); |
594 | bool aborted = adap->transmit_in_progress_aborted; |
595 | |
596 | dprintk(2, "%s: status 0x%02x\n" , __func__, status); |
597 | if (attempts_made < 1) |
598 | attempts_made = 1; |
599 | |
600 | mutex_lock(&adap->lock); |
601 | data = adap->transmitting; |
602 | if (!data) { |
603 | /* |
604 | * This might happen if a transmit was issued and the cable is |
605 | * unplugged while the transmit is ongoing. Ignore this |
606 | * transmit in that case. |
607 | */ |
608 | if (!adap->transmit_in_progress) |
609 | dprintk(1, "%s was called without an ongoing transmit!\n" , |
610 | __func__); |
611 | adap->transmit_in_progress = false; |
612 | goto wake_thread; |
613 | } |
614 | adap->transmit_in_progress = false; |
615 | adap->transmit_in_progress_aborted = false; |
616 | |
617 | msg = &data->msg; |
618 | |
619 | /* Drivers must fill in the status! */ |
620 | WARN_ON(status == 0); |
621 | msg->tx_ts = ktime_to_ns(kt: ts); |
622 | msg->tx_status |= status; |
623 | msg->tx_arb_lost_cnt += arb_lost_cnt; |
624 | msg->tx_nack_cnt += nack_cnt; |
625 | msg->tx_low_drive_cnt += low_drive_cnt; |
626 | msg->tx_error_cnt += error_cnt; |
627 | |
628 | adap->tx_arb_lost_cnt += arb_lost_cnt; |
629 | adap->tx_low_drive_cnt += low_drive_cnt; |
630 | adap->tx_error_cnt += error_cnt; |
631 | |
632 | /* |
633 | * Low Drive transmission errors should really not happen for |
634 | * well-behaved CEC devices and proper HDMI cables. |
635 | * |
636 | * Ditto for the 'Error' status. |
637 | * |
638 | * For the first few times that this happens, log this. |
639 | * Stop logging after that, since that will not add any more |
640 | * useful information and instead it will just flood the kernel log. |
641 | */ |
642 | if (done && adap->tx_low_drive_log_cnt < 8 && msg->tx_low_drive_cnt) { |
643 | adap->tx_low_drive_log_cnt++; |
644 | dprintk(0, "low drive counter: %u (seq %u: %*ph)\n" , |
645 | msg->tx_low_drive_cnt, msg->sequence, |
646 | msg->len, msg->msg); |
647 | } |
648 | if (done && adap->tx_error_log_cnt < 8 && msg->tx_error_cnt) { |
649 | adap->tx_error_log_cnt++; |
650 | dprintk(0, "error counter: %u (seq %u: %*ph)\n" , |
651 | msg->tx_error_cnt, msg->sequence, |
652 | msg->len, msg->msg); |
653 | } |
654 | |
655 | /* Mark that we're done with this transmit */ |
656 | adap->transmitting = NULL; |
657 | |
658 | /* |
659 | * If there are still retry attempts left and there was an error and |
660 | * the hardware didn't signal that it retried itself (by setting |
661 | * CEC_TX_STATUS_MAX_RETRIES), then we will retry ourselves. |
662 | */ |
663 | if (!aborted && data->attempts > attempts_made && !done) { |
664 | /* Retry this message */ |
665 | data->attempts -= attempts_made; |
666 | if (msg->timeout) |
667 | dprintk(2, "retransmit: %*ph (attempts: %d, wait for 0x%02x)\n" , |
668 | msg->len, msg->msg, data->attempts, msg->reply); |
669 | else |
670 | dprintk(2, "retransmit: %*ph (attempts: %d)\n" , |
671 | msg->len, msg->msg, data->attempts); |
672 | /* Add the message in front of the transmit queue */ |
673 | list_add(new: &data->list, head: &adap->transmit_queue); |
674 | adap->transmit_queue_sz++; |
675 | goto wake_thread; |
676 | } |
677 | |
678 | if (aborted && !done) |
679 | status |= CEC_TX_STATUS_ABORTED; |
680 | data->attempts = 0; |
681 | |
682 | /* Always set CEC_TX_STATUS_MAX_RETRIES on error */ |
683 | if (!(status & CEC_TX_STATUS_OK)) |
684 | msg->tx_status |= CEC_TX_STATUS_MAX_RETRIES; |
685 | |
686 | /* Queue transmitted message for monitoring purposes */ |
687 | cec_queue_msg_monitor(adap, msg, valid_la: 1); |
688 | |
689 | if ((status & CEC_TX_STATUS_OK) && adap->is_configured && |
690 | msg->timeout) { |
691 | /* |
692 | * Queue the message into the wait queue if we want to wait |
693 | * for a reply. |
694 | */ |
695 | list_add_tail(new: &data->list, head: &adap->wait_queue); |
696 | schedule_delayed_work(dwork: &data->work, |
697 | delay: msecs_to_jiffies(m: msg->timeout)); |
698 | } else { |
699 | /* Otherwise we're done */ |
700 | cec_data_completed(data); |
701 | } |
702 | |
703 | wake_thread: |
704 | /* |
705 | * Wake up the main thread to see if another message is ready |
706 | * for transmitting or to retry the current message. |
707 | */ |
708 | wake_up_interruptible(&adap->kthread_waitq); |
709 | mutex_unlock(lock: &adap->lock); |
710 | } |
711 | EXPORT_SYMBOL_GPL(cec_transmit_done_ts); |
712 | |
713 | void cec_transmit_attempt_done_ts(struct cec_adapter *adap, |
714 | u8 status, ktime_t ts) |
715 | { |
716 | switch (status & ~CEC_TX_STATUS_MAX_RETRIES) { |
717 | case CEC_TX_STATUS_OK: |
718 | cec_transmit_done_ts(adap, status, 0, 0, 0, 0, ts); |
719 | return; |
720 | case CEC_TX_STATUS_ARB_LOST: |
721 | cec_transmit_done_ts(adap, status, 1, 0, 0, 0, ts); |
722 | return; |
723 | case CEC_TX_STATUS_NACK: |
724 | cec_transmit_done_ts(adap, status, 0, 1, 0, 0, ts); |
725 | return; |
726 | case CEC_TX_STATUS_LOW_DRIVE: |
727 | cec_transmit_done_ts(adap, status, 0, 0, 1, 0, ts); |
728 | return; |
729 | case CEC_TX_STATUS_ERROR: |
730 | cec_transmit_done_ts(adap, status, 0, 0, 0, 1, ts); |
731 | return; |
732 | default: |
733 | /* Should never happen */ |
734 | WARN(1, "cec-%s: invalid status 0x%02x\n" , adap->name, status); |
735 | return; |
736 | } |
737 | } |
738 | EXPORT_SYMBOL_GPL(cec_transmit_attempt_done_ts); |
739 | |
740 | /* |
741 | * Called when waiting for a reply times out. |
742 | */ |
743 | static void cec_wait_timeout(struct work_struct *work) |
744 | { |
745 | struct cec_data *data = container_of(work, struct cec_data, work.work); |
746 | struct cec_adapter *adap = data->adap; |
747 | |
748 | mutex_lock(&adap->lock); |
749 | /* |
750 | * Sanity check in case the timeout and the arrival of the message |
751 | * happened at the same time. |
752 | */ |
753 | if (list_empty(head: &data->list)) |
754 | goto unlock; |
755 | |
756 | /* Mark the message as timed out */ |
757 | list_del_init(entry: &data->list); |
758 | cec_data_cancel(data, CEC_TX_STATUS_OK, CEC_RX_STATUS_TIMEOUT); |
759 | unlock: |
760 | mutex_unlock(lock: &adap->lock); |
761 | } |
762 | |
763 | /* |
764 | * Transmit a message. The fh argument may be NULL if the transmit is not |
765 | * associated with a specific filehandle. |
766 | * |
767 | * This function is called with adap->lock held. |
768 | */ |
769 | int cec_transmit_msg_fh(struct cec_adapter *adap, struct cec_msg *msg, |
770 | struct cec_fh *fh, bool block) |
771 | { |
772 | struct cec_data *data; |
773 | bool is_raw = msg_is_raw(msg); |
774 | |
775 | if (adap->devnode.unregistered) |
776 | return -ENODEV; |
777 | |
778 | msg->rx_ts = 0; |
779 | msg->tx_ts = 0; |
780 | msg->rx_status = 0; |
781 | msg->tx_status = 0; |
782 | msg->tx_arb_lost_cnt = 0; |
783 | msg->tx_nack_cnt = 0; |
784 | msg->tx_low_drive_cnt = 0; |
785 | msg->tx_error_cnt = 0; |
786 | msg->sequence = 0; |
787 | |
788 | if (msg->reply && msg->timeout == 0) { |
789 | /* Make sure the timeout isn't 0. */ |
790 | msg->timeout = 1000; |
791 | } |
792 | msg->flags &= CEC_MSG_FL_REPLY_TO_FOLLOWERS | CEC_MSG_FL_RAW; |
793 | |
794 | if (!msg->timeout) |
795 | msg->flags &= ~CEC_MSG_FL_REPLY_TO_FOLLOWERS; |
796 | |
797 | /* Sanity checks */ |
798 | if (msg->len == 0 || msg->len > CEC_MAX_MSG_SIZE) { |
799 | dprintk(1, "%s: invalid length %d\n" , __func__, msg->len); |
800 | return -EINVAL; |
801 | } |
802 | |
803 | memset(msg->msg + msg->len, 0, sizeof(msg->msg) - msg->len); |
804 | |
805 | if (msg->timeout) |
806 | dprintk(2, "%s: %*ph (wait for 0x%02x%s)\n" , |
807 | __func__, msg->len, msg->msg, msg->reply, |
808 | !block ? ", nb" : "" ); |
809 | else |
810 | dprintk(2, "%s: %*ph%s\n" , |
811 | __func__, msg->len, msg->msg, !block ? " (nb)" : "" ); |
812 | |
813 | if (msg->timeout && msg->len == 1) { |
814 | dprintk(1, "%s: can't reply to poll msg\n" , __func__); |
815 | return -EINVAL; |
816 | } |
817 | |
818 | if (is_raw) { |
819 | if (!capable(CAP_SYS_RAWIO)) |
820 | return -EPERM; |
821 | } else { |
822 | /* A CDC-Only device can only send CDC messages */ |
823 | if ((adap->log_addrs.flags & CEC_LOG_ADDRS_FL_CDC_ONLY) && |
824 | (msg->len == 1 || msg->msg[1] != CEC_MSG_CDC_MESSAGE)) { |
825 | dprintk(1, "%s: not a CDC message\n" , __func__); |
826 | return -EINVAL; |
827 | } |
828 | |
829 | if (msg->len >= 4 && msg->msg[1] == CEC_MSG_CDC_MESSAGE) { |
830 | msg->msg[2] = adap->phys_addr >> 8; |
831 | msg->msg[3] = adap->phys_addr & 0xff; |
832 | } |
833 | |
834 | if (msg->len == 1) { |
835 | if (cec_msg_destination(msg) == 0xf) { |
836 | dprintk(1, "%s: invalid poll message\n" , |
837 | __func__); |
838 | return -EINVAL; |
839 | } |
840 | if (cec_has_log_addr(adap, log_addr: cec_msg_destination(msg))) { |
841 | /* |
842 | * If the destination is a logical address our |
843 | * adapter has already claimed, then just NACK |
844 | * this. It depends on the hardware what it will |
845 | * do with a POLL to itself (some OK this), so |
846 | * it is just as easy to handle it here so the |
847 | * behavior will be consistent. |
848 | */ |
849 | msg->tx_ts = ktime_get_ns(); |
850 | msg->tx_status = CEC_TX_STATUS_NACK | |
851 | CEC_TX_STATUS_MAX_RETRIES; |
852 | msg->tx_nack_cnt = 1; |
853 | msg->sequence = ++adap->sequence; |
854 | if (!msg->sequence) |
855 | msg->sequence = ++adap->sequence; |
856 | return 0; |
857 | } |
858 | } |
859 | if (msg->len > 1 && !cec_msg_is_broadcast(msg) && |
860 | cec_has_log_addr(adap, log_addr: cec_msg_destination(msg))) { |
861 | dprintk(1, "%s: destination is the adapter itself\n" , |
862 | __func__); |
863 | return -EINVAL; |
864 | } |
865 | if (msg->len > 1 && adap->is_configured && |
866 | !cec_has_log_addr(adap, log_addr: cec_msg_initiator(msg))) { |
867 | dprintk(1, "%s: initiator has unknown logical address %d\n" , |
868 | __func__, cec_msg_initiator(msg)); |
869 | return -EINVAL; |
870 | } |
871 | /* |
872 | * Special case: allow Ping and IMAGE/TEXT_VIEW_ON to be |
873 | * transmitted to a TV, even if the adapter is unconfigured. |
874 | * This makes it possible to detect or wake up displays that |
875 | * pull down the HPD when in standby. |
876 | */ |
877 | if (!adap->is_configured && !adap->is_configuring && |
878 | (msg->len > 2 || |
879 | cec_msg_destination(msg) != CEC_LOG_ADDR_TV || |
880 | (msg->len == 2 && msg->msg[1] != CEC_MSG_IMAGE_VIEW_ON && |
881 | msg->msg[1] != CEC_MSG_TEXT_VIEW_ON))) { |
882 | dprintk(1, "%s: adapter is unconfigured\n" , __func__); |
883 | return -ENONET; |
884 | } |
885 | } |
886 | |
887 | if (!adap->is_configured && !adap->is_configuring) { |
888 | if (adap->needs_hpd) { |
889 | dprintk(1, "%s: adapter is unconfigured and needs HPD\n" , |
890 | __func__); |
891 | return -ENONET; |
892 | } |
893 | if (msg->reply) { |
894 | dprintk(1, "%s: invalid msg->reply\n" , __func__); |
895 | return -EINVAL; |
896 | } |
897 | } |
898 | |
899 | if (adap->transmit_queue_sz >= CEC_MAX_MSG_TX_QUEUE_SZ) { |
900 | dprintk(2, "%s: transmit queue full\n" , __func__); |
901 | return -EBUSY; |
902 | } |
903 | |
904 | data = kzalloc(size: sizeof(*data), GFP_KERNEL); |
905 | if (!data) |
906 | return -ENOMEM; |
907 | |
908 | msg->sequence = ++adap->sequence; |
909 | if (!msg->sequence) |
910 | msg->sequence = ++adap->sequence; |
911 | |
912 | data->msg = *msg; |
913 | data->fh = fh; |
914 | data->adap = adap; |
915 | data->blocking = block; |
916 | |
917 | init_completion(x: &data->c); |
918 | INIT_DELAYED_WORK(&data->work, cec_wait_timeout); |
919 | |
920 | if (fh) |
921 | list_add_tail(new: &data->xfer_list, head: &fh->xfer_list); |
922 | else |
923 | INIT_LIST_HEAD(list: &data->xfer_list); |
924 | |
925 | list_add_tail(new: &data->list, head: &adap->transmit_queue); |
926 | adap->transmit_queue_sz++; |
927 | if (!adap->transmitting) |
928 | wake_up_interruptible(&adap->kthread_waitq); |
929 | |
930 | /* All done if we don't need to block waiting for completion */ |
931 | if (!block) |
932 | return 0; |
933 | |
934 | /* |
935 | * Release the lock and wait, retake the lock afterwards. |
936 | */ |
937 | mutex_unlock(lock: &adap->lock); |
938 | wait_for_completion_killable(x: &data->c); |
939 | if (!data->completed) |
940 | cancel_delayed_work_sync(dwork: &data->work); |
941 | mutex_lock(&adap->lock); |
942 | |
943 | /* Cancel the transmit if it was interrupted */ |
944 | if (!data->completed) { |
945 | if (data->msg.tx_status & CEC_TX_STATUS_OK) |
946 | cec_data_cancel(data, CEC_TX_STATUS_OK, CEC_RX_STATUS_ABORTED); |
947 | else |
948 | cec_data_cancel(data, CEC_TX_STATUS_ABORTED, rx_status: 0); |
949 | } |
950 | |
951 | /* The transmit completed (possibly with an error) */ |
952 | *msg = data->msg; |
953 | if (WARN_ON(!list_empty(&data->list))) |
954 | list_del(entry: &data->list); |
955 | if (WARN_ON(!list_empty(&data->xfer_list))) |
956 | list_del(entry: &data->xfer_list); |
957 | kfree(objp: data); |
958 | return 0; |
959 | } |
960 | |
961 | /* Helper function to be used by drivers and this framework. */ |
962 | int cec_transmit_msg(struct cec_adapter *adap, struct cec_msg *msg, |
963 | bool block) |
964 | { |
965 | int ret; |
966 | |
967 | mutex_lock(&adap->lock); |
968 | ret = cec_transmit_msg_fh(adap, msg, NULL, block); |
969 | mutex_unlock(lock: &adap->lock); |
970 | return ret; |
971 | } |
972 | EXPORT_SYMBOL_GPL(cec_transmit_msg); |
973 | |
974 | /* |
975 | * I don't like forward references but without this the low-level |
976 | * cec_received_msg() function would come after a bunch of high-level |
977 | * CEC protocol handling functions. That was very confusing. |
978 | */ |
979 | static int cec_receive_notify(struct cec_adapter *adap, struct cec_msg *msg, |
980 | bool is_reply); |
981 | |
982 | #define DIRECTED 0x80 |
983 | #define BCAST1_4 0x40 |
984 | #define BCAST2_0 0x20 /* broadcast only allowed for >= 2.0 */ |
985 | #define BCAST (BCAST1_4 | BCAST2_0) |
986 | #define BOTH (BCAST | DIRECTED) |
987 | |
988 | /* |
989 | * Specify minimum length and whether the message is directed, broadcast |
990 | * or both. Messages that do not match the criteria are ignored as per |
991 | * the CEC specification. |
992 | */ |
993 | static const u8 cec_msg_size[256] = { |
994 | [CEC_MSG_ACTIVE_SOURCE] = 4 | BCAST, |
995 | [CEC_MSG_IMAGE_VIEW_ON] = 2 | DIRECTED, |
996 | [CEC_MSG_TEXT_VIEW_ON] = 2 | DIRECTED, |
997 | [CEC_MSG_INACTIVE_SOURCE] = 4 | DIRECTED, |
998 | [CEC_MSG_REQUEST_ACTIVE_SOURCE] = 2 | BCAST, |
999 | [CEC_MSG_ROUTING_CHANGE] = 6 | BCAST, |
1000 | [CEC_MSG_ROUTING_INFORMATION] = 4 | BCAST, |
1001 | [CEC_MSG_SET_STREAM_PATH] = 4 | BCAST, |
1002 | [CEC_MSG_STANDBY] = 2 | BOTH, |
1003 | [CEC_MSG_RECORD_OFF] = 2 | DIRECTED, |
1004 | [CEC_MSG_RECORD_ON] = 3 | DIRECTED, |
1005 | [CEC_MSG_RECORD_STATUS] = 3 | DIRECTED, |
1006 | [CEC_MSG_RECORD_TV_SCREEN] = 2 | DIRECTED, |
1007 | [CEC_MSG_CLEAR_ANALOGUE_TIMER] = 13 | DIRECTED, |
1008 | [CEC_MSG_CLEAR_DIGITAL_TIMER] = 16 | DIRECTED, |
1009 | [CEC_MSG_CLEAR_EXT_TIMER] = 13 | DIRECTED, |
1010 | [CEC_MSG_SET_ANALOGUE_TIMER] = 13 | DIRECTED, |
1011 | [CEC_MSG_SET_DIGITAL_TIMER] = 16 | DIRECTED, |
1012 | [CEC_MSG_SET_EXT_TIMER] = 13 | DIRECTED, |
1013 | [CEC_MSG_SET_TIMER_PROGRAM_TITLE] = 2 | DIRECTED, |
1014 | [CEC_MSG_TIMER_CLEARED_STATUS] = 3 | DIRECTED, |
1015 | [CEC_MSG_TIMER_STATUS] = 3 | DIRECTED, |
1016 | [CEC_MSG_CEC_VERSION] = 3 | DIRECTED, |
1017 | [CEC_MSG_GET_CEC_VERSION] = 2 | DIRECTED, |
1018 | [CEC_MSG_GIVE_PHYSICAL_ADDR] = 2 | DIRECTED, |
1019 | [CEC_MSG_GET_MENU_LANGUAGE] = 2 | DIRECTED, |
1020 | [CEC_MSG_REPORT_PHYSICAL_ADDR] = 5 | BCAST, |
1021 | [CEC_MSG_SET_MENU_LANGUAGE] = 5 | BCAST, |
1022 | [CEC_MSG_REPORT_FEATURES] = 6 | BCAST, |
1023 | [CEC_MSG_GIVE_FEATURES] = 2 | DIRECTED, |
1024 | [CEC_MSG_DECK_CONTROL] = 3 | DIRECTED, |
1025 | [CEC_MSG_DECK_STATUS] = 3 | DIRECTED, |
1026 | [CEC_MSG_GIVE_DECK_STATUS] = 3 | DIRECTED, |
1027 | [CEC_MSG_PLAY] = 3 | DIRECTED, |
1028 | [CEC_MSG_GIVE_TUNER_DEVICE_STATUS] = 3 | DIRECTED, |
1029 | [CEC_MSG_SELECT_ANALOGUE_SERVICE] = 6 | DIRECTED, |
1030 | [CEC_MSG_SELECT_DIGITAL_SERVICE] = 9 | DIRECTED, |
1031 | [CEC_MSG_TUNER_DEVICE_STATUS] = 7 | DIRECTED, |
1032 | [CEC_MSG_TUNER_STEP_DECREMENT] = 2 | DIRECTED, |
1033 | [CEC_MSG_TUNER_STEP_INCREMENT] = 2 | DIRECTED, |
1034 | [CEC_MSG_DEVICE_VENDOR_ID] = 5 | BCAST, |
1035 | [CEC_MSG_GIVE_DEVICE_VENDOR_ID] = 2 | DIRECTED, |
1036 | [CEC_MSG_VENDOR_COMMAND] = 2 | DIRECTED, |
1037 | [CEC_MSG_VENDOR_COMMAND_WITH_ID] = 5 | BOTH, |
1038 | [CEC_MSG_VENDOR_REMOTE_BUTTON_DOWN] = 2 | BOTH, |
1039 | [CEC_MSG_VENDOR_REMOTE_BUTTON_UP] = 2 | BOTH, |
1040 | [CEC_MSG_SET_OSD_STRING] = 3 | DIRECTED, |
1041 | [CEC_MSG_GIVE_OSD_NAME] = 2 | DIRECTED, |
1042 | [CEC_MSG_SET_OSD_NAME] = 2 | DIRECTED, |
1043 | [CEC_MSG_MENU_REQUEST] = 3 | DIRECTED, |
1044 | [CEC_MSG_MENU_STATUS] = 3 | DIRECTED, |
1045 | [CEC_MSG_USER_CONTROL_PRESSED] = 3 | DIRECTED, |
1046 | [CEC_MSG_USER_CONTROL_RELEASED] = 2 | DIRECTED, |
1047 | [CEC_MSG_GIVE_DEVICE_POWER_STATUS] = 2 | DIRECTED, |
1048 | [CEC_MSG_REPORT_POWER_STATUS] = 3 | DIRECTED | BCAST2_0, |
1049 | [CEC_MSG_FEATURE_ABORT] = 4 | DIRECTED, |
1050 | [CEC_MSG_ABORT] = 2 | DIRECTED, |
1051 | [CEC_MSG_GIVE_AUDIO_STATUS] = 2 | DIRECTED, |
1052 | [CEC_MSG_GIVE_SYSTEM_AUDIO_MODE_STATUS] = 2 | DIRECTED, |
1053 | [CEC_MSG_REPORT_AUDIO_STATUS] = 3 | DIRECTED, |
1054 | [CEC_MSG_REPORT_SHORT_AUDIO_DESCRIPTOR] = 2 | DIRECTED, |
1055 | [CEC_MSG_REQUEST_SHORT_AUDIO_DESCRIPTOR] = 2 | DIRECTED, |
1056 | [CEC_MSG_SET_SYSTEM_AUDIO_MODE] = 3 | BOTH, |
1057 | [CEC_MSG_SET_AUDIO_VOLUME_LEVEL] = 3 | DIRECTED, |
1058 | [CEC_MSG_SYSTEM_AUDIO_MODE_REQUEST] = 2 | DIRECTED, |
1059 | [CEC_MSG_SYSTEM_AUDIO_MODE_STATUS] = 3 | DIRECTED, |
1060 | [CEC_MSG_SET_AUDIO_RATE] = 3 | DIRECTED, |
1061 | [CEC_MSG_INITIATE_ARC] = 2 | DIRECTED, |
1062 | [CEC_MSG_REPORT_ARC_INITIATED] = 2 | DIRECTED, |
1063 | [CEC_MSG_REPORT_ARC_TERMINATED] = 2 | DIRECTED, |
1064 | [CEC_MSG_REQUEST_ARC_INITIATION] = 2 | DIRECTED, |
1065 | [CEC_MSG_REQUEST_ARC_TERMINATION] = 2 | DIRECTED, |
1066 | [CEC_MSG_TERMINATE_ARC] = 2 | DIRECTED, |
1067 | [CEC_MSG_REQUEST_CURRENT_LATENCY] = 4 | BCAST, |
1068 | [CEC_MSG_REPORT_CURRENT_LATENCY] = 6 | BCAST, |
1069 | [CEC_MSG_CDC_MESSAGE] = 2 | BCAST, |
1070 | }; |
1071 | |
1072 | /* Called by the CEC adapter if a message is received */ |
1073 | void cec_received_msg_ts(struct cec_adapter *adap, |
1074 | struct cec_msg *msg, ktime_t ts) |
1075 | { |
1076 | struct cec_data *data; |
1077 | u8 msg_init = cec_msg_initiator(msg); |
1078 | u8 msg_dest = cec_msg_destination(msg); |
1079 | u8 cmd = msg->msg[1]; |
1080 | bool is_reply = false; |
1081 | bool valid_la = true; |
1082 | bool monitor_valid_la = true; |
1083 | u8 min_len = 0; |
1084 | |
1085 | if (WARN_ON(!msg->len || msg->len > CEC_MAX_MSG_SIZE)) |
1086 | return; |
1087 | |
1088 | if (adap->devnode.unregistered) |
1089 | return; |
1090 | |
1091 | /* |
1092 | * Some CEC adapters will receive the messages that they transmitted. |
1093 | * This test filters out those messages by checking if we are the |
1094 | * initiator, and just returning in that case. |
1095 | * |
1096 | * Note that this won't work if this is an Unregistered device. |
1097 | * |
1098 | * It is bad practice if the hardware receives the message that it |
1099 | * transmitted and luckily most CEC adapters behave correctly in this |
1100 | * respect. |
1101 | */ |
1102 | if (msg_init != CEC_LOG_ADDR_UNREGISTERED && |
1103 | cec_has_log_addr(adap, log_addr: msg_init)) |
1104 | return; |
1105 | |
1106 | msg->rx_ts = ktime_to_ns(kt: ts); |
1107 | msg->rx_status = CEC_RX_STATUS_OK; |
1108 | msg->sequence = msg->reply = msg->timeout = 0; |
1109 | msg->tx_status = 0; |
1110 | msg->tx_ts = 0; |
1111 | msg->tx_arb_lost_cnt = 0; |
1112 | msg->tx_nack_cnt = 0; |
1113 | msg->tx_low_drive_cnt = 0; |
1114 | msg->tx_error_cnt = 0; |
1115 | msg->flags = 0; |
1116 | memset(msg->msg + msg->len, 0, sizeof(msg->msg) - msg->len); |
1117 | |
1118 | mutex_lock(&adap->lock); |
1119 | dprintk(2, "%s: %*ph\n" , __func__, msg->len, msg->msg); |
1120 | |
1121 | if (!adap->transmit_in_progress) |
1122 | adap->last_initiator = 0xff; |
1123 | |
1124 | /* Check if this message was for us (directed or broadcast). */ |
1125 | if (!cec_msg_is_broadcast(msg)) { |
1126 | valid_la = cec_has_log_addr(adap, log_addr: msg_dest); |
1127 | monitor_valid_la = valid_la; |
1128 | } |
1129 | |
1130 | /* |
1131 | * Check if the length is not too short or if the message is a |
1132 | * broadcast message where a directed message was expected or |
1133 | * vice versa. If so, then the message has to be ignored (according |
1134 | * to section CEC 7.3 and CEC 12.2). |
1135 | */ |
1136 | if (valid_la && msg->len > 1 && cec_msg_size[cmd]) { |
1137 | u8 dir_fl = cec_msg_size[cmd] & BOTH; |
1138 | |
1139 | min_len = cec_msg_size[cmd] & 0x1f; |
1140 | if (msg->len < min_len) |
1141 | valid_la = false; |
1142 | else if (!cec_msg_is_broadcast(msg) && !(dir_fl & DIRECTED)) |
1143 | valid_la = false; |
1144 | else if (cec_msg_is_broadcast(msg) && !(dir_fl & BCAST)) |
1145 | valid_la = false; |
1146 | else if (cec_msg_is_broadcast(msg) && |
1147 | adap->log_addrs.cec_version < CEC_OP_CEC_VERSION_2_0 && |
1148 | !(dir_fl & BCAST1_4)) |
1149 | valid_la = false; |
1150 | } |
1151 | if (valid_la && min_len) { |
1152 | /* These messages have special length requirements */ |
1153 | switch (cmd) { |
1154 | case CEC_MSG_RECORD_ON: |
1155 | switch (msg->msg[2]) { |
1156 | case CEC_OP_RECORD_SRC_OWN: |
1157 | break; |
1158 | case CEC_OP_RECORD_SRC_DIGITAL: |
1159 | if (msg->len < 10) |
1160 | valid_la = false; |
1161 | break; |
1162 | case CEC_OP_RECORD_SRC_ANALOG: |
1163 | if (msg->len < 7) |
1164 | valid_la = false; |
1165 | break; |
1166 | case CEC_OP_RECORD_SRC_EXT_PLUG: |
1167 | if (msg->len < 4) |
1168 | valid_la = false; |
1169 | break; |
1170 | case CEC_OP_RECORD_SRC_EXT_PHYS_ADDR: |
1171 | if (msg->len < 5) |
1172 | valid_la = false; |
1173 | break; |
1174 | } |
1175 | break; |
1176 | } |
1177 | } |
1178 | |
1179 | /* It's a valid message and not a poll or CDC message */ |
1180 | if (valid_la && msg->len > 1 && cmd != CEC_MSG_CDC_MESSAGE) { |
1181 | bool abort = cmd == CEC_MSG_FEATURE_ABORT; |
1182 | |
1183 | /* The aborted command is in msg[2] */ |
1184 | if (abort) |
1185 | cmd = msg->msg[2]; |
1186 | |
1187 | /* |
1188 | * Walk over all transmitted messages that are waiting for a |
1189 | * reply. |
1190 | */ |
1191 | list_for_each_entry(data, &adap->wait_queue, list) { |
1192 | struct cec_msg *dst = &data->msg; |
1193 | |
1194 | /* |
1195 | * The *only* CEC message that has two possible replies |
1196 | * is CEC_MSG_INITIATE_ARC. |
1197 | * In this case allow either of the two replies. |
1198 | */ |
1199 | if (!abort && dst->msg[1] == CEC_MSG_INITIATE_ARC && |
1200 | (cmd == CEC_MSG_REPORT_ARC_INITIATED || |
1201 | cmd == CEC_MSG_REPORT_ARC_TERMINATED) && |
1202 | (dst->reply == CEC_MSG_REPORT_ARC_INITIATED || |
1203 | dst->reply == CEC_MSG_REPORT_ARC_TERMINATED)) |
1204 | dst->reply = cmd; |
1205 | |
1206 | /* Does the command match? */ |
1207 | if ((abort && cmd != dst->msg[1]) || |
1208 | (!abort && cmd != dst->reply)) |
1209 | continue; |
1210 | |
1211 | /* Does the addressing match? */ |
1212 | if (msg_init != cec_msg_destination(msg: dst) && |
1213 | !cec_msg_is_broadcast(msg: dst)) |
1214 | continue; |
1215 | |
1216 | /* We got a reply */ |
1217 | memcpy(dst->msg, msg->msg, msg->len); |
1218 | dst->len = msg->len; |
1219 | dst->rx_ts = msg->rx_ts; |
1220 | dst->rx_status = msg->rx_status; |
1221 | if (abort) |
1222 | dst->rx_status |= CEC_RX_STATUS_FEATURE_ABORT; |
1223 | msg->flags = dst->flags; |
1224 | msg->sequence = dst->sequence; |
1225 | /* Remove it from the wait_queue */ |
1226 | list_del_init(entry: &data->list); |
1227 | |
1228 | /* Cancel the pending timeout work */ |
1229 | if (!cancel_delayed_work(dwork: &data->work)) { |
1230 | mutex_unlock(lock: &adap->lock); |
1231 | cancel_delayed_work_sync(dwork: &data->work); |
1232 | mutex_lock(&adap->lock); |
1233 | } |
1234 | /* |
1235 | * Mark this as a reply, provided someone is still |
1236 | * waiting for the answer. |
1237 | */ |
1238 | if (data->fh) |
1239 | is_reply = true; |
1240 | cec_data_completed(data); |
1241 | break; |
1242 | } |
1243 | } |
1244 | mutex_unlock(lock: &adap->lock); |
1245 | |
1246 | /* Pass the message on to any monitoring filehandles */ |
1247 | cec_queue_msg_monitor(adap, msg, valid_la: monitor_valid_la); |
1248 | |
1249 | /* We're done if it is not for us or a poll message */ |
1250 | if (!valid_la || msg->len <= 1) |
1251 | return; |
1252 | |
1253 | if (adap->log_addrs.log_addr_mask == 0) |
1254 | return; |
1255 | |
1256 | /* |
1257 | * Process the message on the protocol level. If is_reply is true, |
1258 | * then cec_receive_notify() won't pass on the reply to the listener(s) |
1259 | * since that was already done by cec_data_completed() above. |
1260 | */ |
1261 | cec_receive_notify(adap, msg, is_reply); |
1262 | } |
1263 | EXPORT_SYMBOL_GPL(cec_received_msg_ts); |
1264 | |
1265 | /* Logical Address Handling */ |
1266 | |
1267 | /* |
1268 | * Attempt to claim a specific logical address. |
1269 | * |
1270 | * This function is called with adap->lock held. |
1271 | */ |
1272 | static int cec_config_log_addr(struct cec_adapter *adap, |
1273 | unsigned int idx, |
1274 | unsigned int log_addr) |
1275 | { |
1276 | struct cec_log_addrs *las = &adap->log_addrs; |
1277 | struct cec_msg msg = { }; |
1278 | const unsigned int max_retries = 2; |
1279 | unsigned int i; |
1280 | int err; |
1281 | |
1282 | if (cec_has_log_addr(adap, log_addr)) |
1283 | return 0; |
1284 | |
1285 | /* Send poll message */ |
1286 | msg.len = 1; |
1287 | msg.msg[0] = (log_addr << 4) | log_addr; |
1288 | |
1289 | for (i = 0; i < max_retries; i++) { |
1290 | err = cec_transmit_msg_fh(adap, msg: &msg, NULL, block: true); |
1291 | |
1292 | /* |
1293 | * While trying to poll the physical address was reset |
1294 | * and the adapter was unconfigured, so bail out. |
1295 | */ |
1296 | if (adap->phys_addr == CEC_PHYS_ADDR_INVALID) |
1297 | return -EINTR; |
1298 | |
1299 | /* Also bail out if the PA changed while configuring. */ |
1300 | if (adap->must_reconfigure) |
1301 | return -EINTR; |
1302 | |
1303 | if (err) |
1304 | return err; |
1305 | |
1306 | /* |
1307 | * The message was aborted or timed out due to a disconnect or |
1308 | * unconfigure, just bail out. |
1309 | */ |
1310 | if (msg.tx_status & |
1311 | (CEC_TX_STATUS_ABORTED | CEC_TX_STATUS_TIMEOUT)) |
1312 | return -EINTR; |
1313 | if (msg.tx_status & CEC_TX_STATUS_OK) |
1314 | return 0; |
1315 | if (msg.tx_status & CEC_TX_STATUS_NACK) |
1316 | break; |
1317 | /* |
1318 | * Retry up to max_retries times if the message was neither |
1319 | * OKed or NACKed. This can happen due to e.g. a Lost |
1320 | * Arbitration condition. |
1321 | */ |
1322 | } |
1323 | |
1324 | /* |
1325 | * If we are unable to get an OK or a NACK after max_retries attempts |
1326 | * (and note that each attempt already consists of four polls), then |
1327 | * we assume that something is really weird and that it is not a |
1328 | * good idea to try and claim this logical address. |
1329 | */ |
1330 | if (i == max_retries) { |
1331 | dprintk(0, "polling for LA %u failed with tx_status=0x%04x\n" , |
1332 | log_addr, msg.tx_status); |
1333 | return 0; |
1334 | } |
1335 | |
1336 | /* |
1337 | * Message not acknowledged, so this logical |
1338 | * address is free to use. |
1339 | */ |
1340 | err = call_op(adap, adap_log_addr, log_addr); |
1341 | if (err) |
1342 | return err; |
1343 | |
1344 | las->log_addr[idx] = log_addr; |
1345 | las->log_addr_mask |= 1 << log_addr; |
1346 | return 1; |
1347 | } |
1348 | |
1349 | /* |
1350 | * Unconfigure the adapter: clear all logical addresses and send |
1351 | * the state changed event. |
1352 | * |
1353 | * This function is called with adap->lock held. |
1354 | */ |
1355 | static void cec_adap_unconfigure(struct cec_adapter *adap) |
1356 | { |
1357 | if (!adap->needs_hpd || adap->phys_addr != CEC_PHYS_ADDR_INVALID) |
1358 | WARN_ON(call_op(adap, adap_log_addr, CEC_LOG_ADDR_INVALID)); |
1359 | adap->log_addrs.log_addr_mask = 0; |
1360 | adap->is_configured = false; |
1361 | cec_flush(adap); |
1362 | wake_up_interruptible(&adap->kthread_waitq); |
1363 | cec_post_state_event(adap); |
1364 | call_void_op(adap, adap_unconfigured); |
1365 | } |
1366 | |
1367 | /* |
1368 | * Attempt to claim the required logical addresses. |
1369 | */ |
1370 | static int cec_config_thread_func(void *arg) |
1371 | { |
1372 | /* The various LAs for each type of device */ |
1373 | static const u8 tv_log_addrs[] = { |
1374 | CEC_LOG_ADDR_TV, CEC_LOG_ADDR_SPECIFIC, |
1375 | CEC_LOG_ADDR_INVALID |
1376 | }; |
1377 | static const u8 record_log_addrs[] = { |
1378 | CEC_LOG_ADDR_RECORD_1, CEC_LOG_ADDR_RECORD_2, |
1379 | CEC_LOG_ADDR_RECORD_3, |
1380 | CEC_LOG_ADDR_BACKUP_1, CEC_LOG_ADDR_BACKUP_2, |
1381 | CEC_LOG_ADDR_INVALID |
1382 | }; |
1383 | static const u8 tuner_log_addrs[] = { |
1384 | CEC_LOG_ADDR_TUNER_1, CEC_LOG_ADDR_TUNER_2, |
1385 | CEC_LOG_ADDR_TUNER_3, CEC_LOG_ADDR_TUNER_4, |
1386 | CEC_LOG_ADDR_BACKUP_1, CEC_LOG_ADDR_BACKUP_2, |
1387 | CEC_LOG_ADDR_INVALID |
1388 | }; |
1389 | static const u8 playback_log_addrs[] = { |
1390 | CEC_LOG_ADDR_PLAYBACK_1, CEC_LOG_ADDR_PLAYBACK_2, |
1391 | CEC_LOG_ADDR_PLAYBACK_3, |
1392 | CEC_LOG_ADDR_BACKUP_1, CEC_LOG_ADDR_BACKUP_2, |
1393 | CEC_LOG_ADDR_INVALID |
1394 | }; |
1395 | static const u8 audiosystem_log_addrs[] = { |
1396 | CEC_LOG_ADDR_AUDIOSYSTEM, |
1397 | CEC_LOG_ADDR_INVALID |
1398 | }; |
1399 | static const u8 specific_use_log_addrs[] = { |
1400 | CEC_LOG_ADDR_SPECIFIC, |
1401 | CEC_LOG_ADDR_BACKUP_1, CEC_LOG_ADDR_BACKUP_2, |
1402 | CEC_LOG_ADDR_INVALID |
1403 | }; |
1404 | static const u8 *type2addrs[6] = { |
1405 | [CEC_LOG_ADDR_TYPE_TV] = tv_log_addrs, |
1406 | [CEC_LOG_ADDR_TYPE_RECORD] = record_log_addrs, |
1407 | [CEC_LOG_ADDR_TYPE_TUNER] = tuner_log_addrs, |
1408 | [CEC_LOG_ADDR_TYPE_PLAYBACK] = playback_log_addrs, |
1409 | [CEC_LOG_ADDR_TYPE_AUDIOSYSTEM] = audiosystem_log_addrs, |
1410 | [CEC_LOG_ADDR_TYPE_SPECIFIC] = specific_use_log_addrs, |
1411 | }; |
1412 | static const u16 type2mask[] = { |
1413 | [CEC_LOG_ADDR_TYPE_TV] = CEC_LOG_ADDR_MASK_TV, |
1414 | [CEC_LOG_ADDR_TYPE_RECORD] = CEC_LOG_ADDR_MASK_RECORD, |
1415 | [CEC_LOG_ADDR_TYPE_TUNER] = CEC_LOG_ADDR_MASK_TUNER, |
1416 | [CEC_LOG_ADDR_TYPE_PLAYBACK] = CEC_LOG_ADDR_MASK_PLAYBACK, |
1417 | [CEC_LOG_ADDR_TYPE_AUDIOSYSTEM] = CEC_LOG_ADDR_MASK_AUDIOSYSTEM, |
1418 | [CEC_LOG_ADDR_TYPE_SPECIFIC] = CEC_LOG_ADDR_MASK_SPECIFIC, |
1419 | }; |
1420 | struct cec_adapter *adap = arg; |
1421 | struct cec_log_addrs *las = &adap->log_addrs; |
1422 | int err; |
1423 | int i, j; |
1424 | |
1425 | mutex_lock(&adap->lock); |
1426 | dprintk(1, "physical address: %x.%x.%x.%x, claim %d logical addresses\n" , |
1427 | cec_phys_addr_exp(adap->phys_addr), las->num_log_addrs); |
1428 | las->log_addr_mask = 0; |
1429 | |
1430 | if (las->log_addr_type[0] == CEC_LOG_ADDR_TYPE_UNREGISTERED) |
1431 | goto configured; |
1432 | |
1433 | reconfigure: |
1434 | for (i = 0; i < las->num_log_addrs; i++) { |
1435 | unsigned int type = las->log_addr_type[i]; |
1436 | const u8 *la_list; |
1437 | u8 last_la; |
1438 | |
1439 | /* |
1440 | * The TV functionality can only map to physical address 0. |
1441 | * For any other address, try the Specific functionality |
1442 | * instead as per the spec. |
1443 | */ |
1444 | if (adap->phys_addr && type == CEC_LOG_ADDR_TYPE_TV) |
1445 | type = CEC_LOG_ADDR_TYPE_SPECIFIC; |
1446 | |
1447 | la_list = type2addrs[type]; |
1448 | last_la = las->log_addr[i]; |
1449 | las->log_addr[i] = CEC_LOG_ADDR_INVALID; |
1450 | if (last_la == CEC_LOG_ADDR_INVALID || |
1451 | last_la == CEC_LOG_ADDR_UNREGISTERED || |
1452 | !((1 << last_la) & type2mask[type])) |
1453 | last_la = la_list[0]; |
1454 | |
1455 | err = cec_config_log_addr(adap, idx: i, log_addr: last_la); |
1456 | |
1457 | if (adap->must_reconfigure) { |
1458 | adap->must_reconfigure = false; |
1459 | las->log_addr_mask = 0; |
1460 | goto reconfigure; |
1461 | } |
1462 | |
1463 | if (err > 0) /* Reused last LA */ |
1464 | continue; |
1465 | |
1466 | if (err < 0) |
1467 | goto unconfigure; |
1468 | |
1469 | for (j = 0; la_list[j] != CEC_LOG_ADDR_INVALID; j++) { |
1470 | /* Tried this one already, skip it */ |
1471 | if (la_list[j] == last_la) |
1472 | continue; |
1473 | /* The backup addresses are CEC 2.0 specific */ |
1474 | if ((la_list[j] == CEC_LOG_ADDR_BACKUP_1 || |
1475 | la_list[j] == CEC_LOG_ADDR_BACKUP_2) && |
1476 | las->cec_version < CEC_OP_CEC_VERSION_2_0) |
1477 | continue; |
1478 | |
1479 | err = cec_config_log_addr(adap, idx: i, log_addr: la_list[j]); |
1480 | if (err == 0) /* LA is in use */ |
1481 | continue; |
1482 | if (err < 0) |
1483 | goto unconfigure; |
1484 | /* Done, claimed an LA */ |
1485 | break; |
1486 | } |
1487 | |
1488 | if (la_list[j] == CEC_LOG_ADDR_INVALID) |
1489 | dprintk(1, "could not claim LA %d\n" , i); |
1490 | } |
1491 | |
1492 | if (adap->log_addrs.log_addr_mask == 0 && |
1493 | !(las->flags & CEC_LOG_ADDRS_FL_ALLOW_UNREG_FALLBACK)) |
1494 | goto unconfigure; |
1495 | |
1496 | configured: |
1497 | if (adap->log_addrs.log_addr_mask == 0) { |
1498 | /* Fall back to unregistered */ |
1499 | las->log_addr[0] = CEC_LOG_ADDR_UNREGISTERED; |
1500 | las->log_addr_mask = 1 << las->log_addr[0]; |
1501 | for (i = 1; i < las->num_log_addrs; i++) |
1502 | las->log_addr[i] = CEC_LOG_ADDR_INVALID; |
1503 | } |
1504 | for (i = las->num_log_addrs; i < CEC_MAX_LOG_ADDRS; i++) |
1505 | las->log_addr[i] = CEC_LOG_ADDR_INVALID; |
1506 | adap->is_configured = true; |
1507 | adap->is_configuring = false; |
1508 | adap->must_reconfigure = false; |
1509 | cec_post_state_event(adap); |
1510 | |
1511 | /* |
1512 | * Now post the Report Features and Report Physical Address broadcast |
1513 | * messages. Note that these are non-blocking transmits, meaning that |
1514 | * they are just queued up and once adap->lock is unlocked the main |
1515 | * thread will kick in and start transmitting these. |
1516 | * |
1517 | * If after this function is done (but before one or more of these |
1518 | * messages are actually transmitted) the CEC adapter is unconfigured, |
1519 | * then any remaining messages will be dropped by the main thread. |
1520 | */ |
1521 | for (i = 0; i < las->num_log_addrs; i++) { |
1522 | struct cec_msg msg = {}; |
1523 | |
1524 | if (las->log_addr[i] == CEC_LOG_ADDR_INVALID || |
1525 | (las->flags & CEC_LOG_ADDRS_FL_CDC_ONLY)) |
1526 | continue; |
1527 | |
1528 | msg.msg[0] = (las->log_addr[i] << 4) | 0x0f; |
1529 | |
1530 | /* Report Features must come first according to CEC 2.0 */ |
1531 | if (las->log_addr[i] != CEC_LOG_ADDR_UNREGISTERED && |
1532 | adap->log_addrs.cec_version >= CEC_OP_CEC_VERSION_2_0) { |
1533 | cec_fill_msg_report_features(adap, msg: &msg, la_idx: i); |
1534 | cec_transmit_msg_fh(adap, msg: &msg, NULL, block: false); |
1535 | } |
1536 | |
1537 | /* Report Physical Address */ |
1538 | cec_msg_report_physical_addr(msg: &msg, phys_addr: adap->phys_addr, |
1539 | prim_devtype: las->primary_device_type[i]); |
1540 | dprintk(1, "config: la %d pa %x.%x.%x.%x\n" , |
1541 | las->log_addr[i], |
1542 | cec_phys_addr_exp(adap->phys_addr)); |
1543 | cec_transmit_msg_fh(adap, msg: &msg, NULL, block: false); |
1544 | |
1545 | /* Report Vendor ID */ |
1546 | if (adap->log_addrs.vendor_id != CEC_VENDOR_ID_NONE) { |
1547 | cec_msg_device_vendor_id(msg: &msg, |
1548 | vendor_id: adap->log_addrs.vendor_id); |
1549 | cec_transmit_msg_fh(adap, msg: &msg, NULL, block: false); |
1550 | } |
1551 | } |
1552 | adap->kthread_config = NULL; |
1553 | complete(&adap->config_completion); |
1554 | mutex_unlock(lock: &adap->lock); |
1555 | call_void_op(adap, configured); |
1556 | return 0; |
1557 | |
1558 | unconfigure: |
1559 | for (i = 0; i < las->num_log_addrs; i++) |
1560 | las->log_addr[i] = CEC_LOG_ADDR_INVALID; |
1561 | cec_adap_unconfigure(adap); |
1562 | adap->is_configuring = false; |
1563 | adap->must_reconfigure = false; |
1564 | adap->kthread_config = NULL; |
1565 | complete(&adap->config_completion); |
1566 | mutex_unlock(lock: &adap->lock); |
1567 | return 0; |
1568 | } |
1569 | |
1570 | /* |
1571 | * Called from either __cec_s_phys_addr or __cec_s_log_addrs to claim the |
1572 | * logical addresses. |
1573 | * |
1574 | * This function is called with adap->lock held. |
1575 | */ |
1576 | static void cec_claim_log_addrs(struct cec_adapter *adap, bool block) |
1577 | { |
1578 | if (WARN_ON(adap->is_configuring || adap->is_configured)) |
1579 | return; |
1580 | |
1581 | init_completion(x: &adap->config_completion); |
1582 | |
1583 | /* Ready to kick off the thread */ |
1584 | adap->is_configuring = true; |
1585 | adap->kthread_config = kthread_run(cec_config_thread_func, adap, |
1586 | "ceccfg-%s" , adap->name); |
1587 | if (IS_ERR(ptr: adap->kthread_config)) { |
1588 | adap->kthread_config = NULL; |
1589 | adap->is_configuring = false; |
1590 | } else if (block) { |
1591 | mutex_unlock(lock: &adap->lock); |
1592 | wait_for_completion(&adap->config_completion); |
1593 | mutex_lock(&adap->lock); |
1594 | } |
1595 | } |
1596 | |
1597 | /* |
1598 | * Helper function to enable/disable the CEC adapter. |
1599 | * |
1600 | * This function is called with adap->lock held. |
1601 | */ |
1602 | int cec_adap_enable(struct cec_adapter *adap) |
1603 | { |
1604 | bool enable; |
1605 | int ret = 0; |
1606 | |
1607 | enable = adap->monitor_all_cnt || adap->monitor_pin_cnt || |
1608 | adap->log_addrs.num_log_addrs; |
1609 | if (adap->needs_hpd) |
1610 | enable = enable && adap->phys_addr != CEC_PHYS_ADDR_INVALID; |
1611 | |
1612 | if (adap->devnode.unregistered) |
1613 | enable = false; |
1614 | |
1615 | if (enable == adap->is_enabled) |
1616 | return 0; |
1617 | |
1618 | /* serialize adap_enable */ |
1619 | mutex_lock(&adap->devnode.lock); |
1620 | if (enable) { |
1621 | adap->last_initiator = 0xff; |
1622 | adap->transmit_in_progress = false; |
1623 | adap->tx_low_drive_log_cnt = 0; |
1624 | adap->tx_error_log_cnt = 0; |
1625 | ret = adap->ops->adap_enable(adap, true); |
1626 | if (!ret) { |
1627 | /* |
1628 | * Enable monitor-all/pin modes if needed. We warn, but |
1629 | * continue if this fails as this is not a critical error. |
1630 | */ |
1631 | if (adap->monitor_all_cnt) |
1632 | WARN_ON(call_op(adap, adap_monitor_all_enable, true)); |
1633 | if (adap->monitor_pin_cnt) |
1634 | WARN_ON(call_op(adap, adap_monitor_pin_enable, true)); |
1635 | } |
1636 | } else { |
1637 | /* Disable monitor-all/pin modes if needed (needs_hpd == 1) */ |
1638 | if (adap->monitor_all_cnt) |
1639 | WARN_ON(call_op(adap, adap_monitor_all_enable, false)); |
1640 | if (adap->monitor_pin_cnt) |
1641 | WARN_ON(call_op(adap, adap_monitor_pin_enable, false)); |
1642 | WARN_ON(adap->ops->adap_enable(adap, false)); |
1643 | adap->last_initiator = 0xff; |
1644 | adap->transmit_in_progress = false; |
1645 | adap->transmit_in_progress_aborted = false; |
1646 | if (adap->transmitting) |
1647 | cec_data_cancel(data: adap->transmitting, CEC_TX_STATUS_ABORTED, rx_status: 0); |
1648 | } |
1649 | if (!ret) |
1650 | adap->is_enabled = enable; |
1651 | wake_up_interruptible(&adap->kthread_waitq); |
1652 | mutex_unlock(lock: &adap->devnode.lock); |
1653 | return ret; |
1654 | } |
1655 | |
1656 | /* Set a new physical address and send an event notifying userspace of this. |
1657 | * |
1658 | * This function is called with adap->lock held. |
1659 | */ |
1660 | void __cec_s_phys_addr(struct cec_adapter *adap, u16 phys_addr, bool block) |
1661 | { |
1662 | bool becomes_invalid = phys_addr == CEC_PHYS_ADDR_INVALID; |
1663 | bool is_invalid = adap->phys_addr == CEC_PHYS_ADDR_INVALID; |
1664 | |
1665 | if (phys_addr == adap->phys_addr) |
1666 | return; |
1667 | if (!becomes_invalid && adap->devnode.unregistered) |
1668 | return; |
1669 | |
1670 | dprintk(1, "new physical address %x.%x.%x.%x\n" , |
1671 | cec_phys_addr_exp(phys_addr)); |
1672 | if (becomes_invalid || !is_invalid) { |
1673 | adap->phys_addr = CEC_PHYS_ADDR_INVALID; |
1674 | cec_post_state_event(adap); |
1675 | cec_adap_unconfigure(adap); |
1676 | if (becomes_invalid) { |
1677 | cec_adap_enable(adap); |
1678 | return; |
1679 | } |
1680 | } |
1681 | |
1682 | adap->phys_addr = phys_addr; |
1683 | if (is_invalid) |
1684 | cec_adap_enable(adap); |
1685 | |
1686 | cec_post_state_event(adap); |
1687 | if (!adap->log_addrs.num_log_addrs) |
1688 | return; |
1689 | if (adap->is_configuring) |
1690 | adap->must_reconfigure = true; |
1691 | else |
1692 | cec_claim_log_addrs(adap, block); |
1693 | } |
1694 | |
1695 | void cec_s_phys_addr(struct cec_adapter *adap, u16 phys_addr, bool block) |
1696 | { |
1697 | if (IS_ERR_OR_NULL(ptr: adap)) |
1698 | return; |
1699 | |
1700 | mutex_lock(&adap->lock); |
1701 | __cec_s_phys_addr(adap, phys_addr, block); |
1702 | mutex_unlock(lock: &adap->lock); |
1703 | } |
1704 | EXPORT_SYMBOL_GPL(cec_s_phys_addr); |
1705 | |
1706 | /* |
1707 | * Note: In the drm subsystem, prefer calling (if possible): |
1708 | * |
1709 | * cec_s_phys_addr(adap, connector->display_info.source_physical_address, false); |
1710 | */ |
1711 | void cec_s_phys_addr_from_edid(struct cec_adapter *adap, |
1712 | const struct edid *edid) |
1713 | { |
1714 | u16 pa = CEC_PHYS_ADDR_INVALID; |
1715 | |
1716 | if (edid && edid->extensions) |
1717 | pa = cec_get_edid_phys_addr((const u8 *)edid, |
1718 | EDID_LENGTH * (edid->extensions + 1), NULL); |
1719 | cec_s_phys_addr(adap, pa, false); |
1720 | } |
1721 | EXPORT_SYMBOL_GPL(cec_s_phys_addr_from_edid); |
1722 | |
1723 | void cec_s_conn_info(struct cec_adapter *adap, |
1724 | const struct cec_connector_info *conn_info) |
1725 | { |
1726 | if (IS_ERR_OR_NULL(ptr: adap)) |
1727 | return; |
1728 | |
1729 | if (!(adap->capabilities & CEC_CAP_CONNECTOR_INFO)) |
1730 | return; |
1731 | |
1732 | mutex_lock(&adap->lock); |
1733 | if (conn_info) |
1734 | adap->conn_info = *conn_info; |
1735 | else |
1736 | memset(&adap->conn_info, 0, sizeof(adap->conn_info)); |
1737 | cec_post_state_event(adap); |
1738 | mutex_unlock(lock: &adap->lock); |
1739 | } |
1740 | EXPORT_SYMBOL_GPL(cec_s_conn_info); |
1741 | |
1742 | /* |
1743 | * Called from either the ioctl or a driver to set the logical addresses. |
1744 | * |
1745 | * This function is called with adap->lock held. |
1746 | */ |
1747 | int __cec_s_log_addrs(struct cec_adapter *adap, |
1748 | struct cec_log_addrs *log_addrs, bool block) |
1749 | { |
1750 | u16 type_mask = 0; |
1751 | int err; |
1752 | int i; |
1753 | |
1754 | if (adap->devnode.unregistered) |
1755 | return -ENODEV; |
1756 | |
1757 | if (!log_addrs || log_addrs->num_log_addrs == 0) { |
1758 | if (!adap->log_addrs.num_log_addrs) |
1759 | return 0; |
1760 | if (adap->is_configuring || adap->is_configured) |
1761 | cec_adap_unconfigure(adap); |
1762 | adap->log_addrs.num_log_addrs = 0; |
1763 | for (i = 0; i < CEC_MAX_LOG_ADDRS; i++) |
1764 | adap->log_addrs.log_addr[i] = CEC_LOG_ADDR_INVALID; |
1765 | adap->log_addrs.osd_name[0] = '\0'; |
1766 | adap->log_addrs.vendor_id = CEC_VENDOR_ID_NONE; |
1767 | adap->log_addrs.cec_version = CEC_OP_CEC_VERSION_2_0; |
1768 | cec_adap_enable(adap); |
1769 | return 0; |
1770 | } |
1771 | |
1772 | if (log_addrs->flags & CEC_LOG_ADDRS_FL_CDC_ONLY) { |
1773 | /* |
1774 | * Sanitize log_addrs fields if a CDC-Only device is |
1775 | * requested. |
1776 | */ |
1777 | log_addrs->num_log_addrs = 1; |
1778 | log_addrs->osd_name[0] = '\0'; |
1779 | log_addrs->vendor_id = CEC_VENDOR_ID_NONE; |
1780 | log_addrs->log_addr_type[0] = CEC_LOG_ADDR_TYPE_UNREGISTERED; |
1781 | /* |
1782 | * This is just an internal convention since a CDC-Only device |
1783 | * doesn't have to be a switch. But switches already use |
1784 | * unregistered, so it makes some kind of sense to pick this |
1785 | * as the primary device. Since a CDC-Only device never sends |
1786 | * any 'normal' CEC messages this primary device type is never |
1787 | * sent over the CEC bus. |
1788 | */ |
1789 | log_addrs->primary_device_type[0] = CEC_OP_PRIM_DEVTYPE_SWITCH; |
1790 | log_addrs->all_device_types[0] = 0; |
1791 | log_addrs->features[0][0] = 0; |
1792 | log_addrs->features[0][1] = 0; |
1793 | } |
1794 | |
1795 | /* Ensure the osd name is 0-terminated */ |
1796 | log_addrs->osd_name[sizeof(log_addrs->osd_name) - 1] = '\0'; |
1797 | |
1798 | /* Sanity checks */ |
1799 | if (log_addrs->num_log_addrs > adap->available_log_addrs) { |
1800 | dprintk(1, "num_log_addrs > %d\n" , adap->available_log_addrs); |
1801 | return -EINVAL; |
1802 | } |
1803 | |
1804 | /* |
1805 | * Vendor ID is a 24 bit number, so check if the value is |
1806 | * within the correct range. |
1807 | */ |
1808 | if (log_addrs->vendor_id != CEC_VENDOR_ID_NONE && |
1809 | (log_addrs->vendor_id & 0xff000000) != 0) { |
1810 | dprintk(1, "invalid vendor ID\n" ); |
1811 | return -EINVAL; |
1812 | } |
1813 | |
1814 | if (log_addrs->cec_version != CEC_OP_CEC_VERSION_1_4 && |
1815 | log_addrs->cec_version != CEC_OP_CEC_VERSION_2_0) { |
1816 | dprintk(1, "invalid CEC version\n" ); |
1817 | return -EINVAL; |
1818 | } |
1819 | |
1820 | if (log_addrs->num_log_addrs > 1) |
1821 | for (i = 0; i < log_addrs->num_log_addrs; i++) |
1822 | if (log_addrs->log_addr_type[i] == |
1823 | CEC_LOG_ADDR_TYPE_UNREGISTERED) { |
1824 | dprintk(1, "num_log_addrs > 1 can't be combined with unregistered LA\n" ); |
1825 | return -EINVAL; |
1826 | } |
1827 | |
1828 | for (i = 0; i < log_addrs->num_log_addrs; i++) { |
1829 | const u8 feature_sz = ARRAY_SIZE(log_addrs->features[0]); |
1830 | u8 *features = log_addrs->features[i]; |
1831 | bool op_is_dev_features = false; |
1832 | unsigned int j; |
1833 | |
1834 | log_addrs->log_addr[i] = CEC_LOG_ADDR_INVALID; |
1835 | if (log_addrs->log_addr_type[i] > CEC_LOG_ADDR_TYPE_UNREGISTERED) { |
1836 | dprintk(1, "unknown logical address type\n" ); |
1837 | return -EINVAL; |
1838 | } |
1839 | if (type_mask & (1 << log_addrs->log_addr_type[i])) { |
1840 | dprintk(1, "duplicate logical address type\n" ); |
1841 | return -EINVAL; |
1842 | } |
1843 | type_mask |= 1 << log_addrs->log_addr_type[i]; |
1844 | if ((type_mask & (1 << CEC_LOG_ADDR_TYPE_RECORD)) && |
1845 | (type_mask & (1 << CEC_LOG_ADDR_TYPE_PLAYBACK))) { |
1846 | /* Record already contains the playback functionality */ |
1847 | dprintk(1, "invalid record + playback combination\n" ); |
1848 | return -EINVAL; |
1849 | } |
1850 | if (log_addrs->primary_device_type[i] > |
1851 | CEC_OP_PRIM_DEVTYPE_PROCESSOR) { |
1852 | dprintk(1, "unknown primary device type\n" ); |
1853 | return -EINVAL; |
1854 | } |
1855 | if (log_addrs->primary_device_type[i] == 2) { |
1856 | dprintk(1, "invalid primary device type\n" ); |
1857 | return -EINVAL; |
1858 | } |
1859 | for (j = 0; j < feature_sz; j++) { |
1860 | if ((features[j] & 0x80) == 0) { |
1861 | if (op_is_dev_features) |
1862 | break; |
1863 | op_is_dev_features = true; |
1864 | } |
1865 | } |
1866 | if (!op_is_dev_features || j == feature_sz) { |
1867 | dprintk(1, "malformed features\n" ); |
1868 | return -EINVAL; |
1869 | } |
1870 | /* Zero unused part of the feature array */ |
1871 | memset(features + j + 1, 0, feature_sz - j - 1); |
1872 | } |
1873 | |
1874 | if (log_addrs->cec_version >= CEC_OP_CEC_VERSION_2_0) { |
1875 | if (log_addrs->num_log_addrs > 2) { |
1876 | dprintk(1, "CEC 2.0 allows no more than 2 logical addresses\n" ); |
1877 | return -EINVAL; |
1878 | } |
1879 | if (log_addrs->num_log_addrs == 2) { |
1880 | if (!(type_mask & ((1 << CEC_LOG_ADDR_TYPE_AUDIOSYSTEM) | |
1881 | (1 << CEC_LOG_ADDR_TYPE_TV)))) { |
1882 | dprintk(1, "two LAs is only allowed for audiosystem and TV\n" ); |
1883 | return -EINVAL; |
1884 | } |
1885 | if (!(type_mask & ((1 << CEC_LOG_ADDR_TYPE_PLAYBACK) | |
1886 | (1 << CEC_LOG_ADDR_TYPE_RECORD)))) { |
1887 | dprintk(1, "an audiosystem/TV can only be combined with record or playback\n" ); |
1888 | return -EINVAL; |
1889 | } |
1890 | } |
1891 | } |
1892 | |
1893 | /* Zero unused LAs */ |
1894 | for (i = log_addrs->num_log_addrs; i < CEC_MAX_LOG_ADDRS; i++) { |
1895 | log_addrs->primary_device_type[i] = 0; |
1896 | log_addrs->log_addr_type[i] = 0; |
1897 | log_addrs->all_device_types[i] = 0; |
1898 | memset(log_addrs->features[i], 0, |
1899 | sizeof(log_addrs->features[i])); |
1900 | } |
1901 | |
1902 | log_addrs->log_addr_mask = adap->log_addrs.log_addr_mask; |
1903 | adap->log_addrs = *log_addrs; |
1904 | err = cec_adap_enable(adap); |
1905 | if (!err && adap->phys_addr != CEC_PHYS_ADDR_INVALID) |
1906 | cec_claim_log_addrs(adap, block); |
1907 | return err; |
1908 | } |
1909 | |
1910 | int cec_s_log_addrs(struct cec_adapter *adap, |
1911 | struct cec_log_addrs *log_addrs, bool block) |
1912 | { |
1913 | int err; |
1914 | |
1915 | mutex_lock(&adap->lock); |
1916 | err = __cec_s_log_addrs(adap, log_addrs, block); |
1917 | mutex_unlock(lock: &adap->lock); |
1918 | return err; |
1919 | } |
1920 | EXPORT_SYMBOL_GPL(cec_s_log_addrs); |
1921 | |
1922 | /* High-level core CEC message handling */ |
1923 | |
1924 | /* Fill in the Report Features message */ |
1925 | static void cec_fill_msg_report_features(struct cec_adapter *adap, |
1926 | struct cec_msg *msg, |
1927 | unsigned int la_idx) |
1928 | { |
1929 | const struct cec_log_addrs *las = &adap->log_addrs; |
1930 | const u8 *features = las->features[la_idx]; |
1931 | bool op_is_dev_features = false; |
1932 | unsigned int idx; |
1933 | |
1934 | /* Report Features */ |
1935 | msg->msg[0] = (las->log_addr[la_idx] << 4) | 0x0f; |
1936 | msg->len = 4; |
1937 | msg->msg[1] = CEC_MSG_REPORT_FEATURES; |
1938 | msg->msg[2] = adap->log_addrs.cec_version; |
1939 | msg->msg[3] = las->all_device_types[la_idx]; |
1940 | |
1941 | /* Write RC Profiles first, then Device Features */ |
1942 | for (idx = 0; idx < ARRAY_SIZE(las->features[0]); idx++) { |
1943 | msg->msg[msg->len++] = features[idx]; |
1944 | if ((features[idx] & CEC_OP_FEAT_EXT) == 0) { |
1945 | if (op_is_dev_features) |
1946 | break; |
1947 | op_is_dev_features = true; |
1948 | } |
1949 | } |
1950 | } |
1951 | |
1952 | /* Transmit the Feature Abort message */ |
1953 | static int cec_feature_abort_reason(struct cec_adapter *adap, |
1954 | struct cec_msg *msg, u8 reason) |
1955 | { |
1956 | struct cec_msg tx_msg = { }; |
1957 | |
1958 | /* |
1959 | * Don't reply with CEC_MSG_FEATURE_ABORT to a CEC_MSG_FEATURE_ABORT |
1960 | * message! |
1961 | */ |
1962 | if (msg->msg[1] == CEC_MSG_FEATURE_ABORT) |
1963 | return 0; |
1964 | /* Don't Feature Abort messages from 'Unregistered' */ |
1965 | if (cec_msg_initiator(msg) == CEC_LOG_ADDR_UNREGISTERED) |
1966 | return 0; |
1967 | cec_msg_set_reply_to(msg: &tx_msg, orig: msg); |
1968 | cec_msg_feature_abort(msg: &tx_msg, abort_msg: msg->msg[1], reason); |
1969 | return cec_transmit_msg(adap, &tx_msg, false); |
1970 | } |
1971 | |
1972 | static int cec_feature_abort(struct cec_adapter *adap, struct cec_msg *msg) |
1973 | { |
1974 | return cec_feature_abort_reason(adap, msg, |
1975 | CEC_OP_ABORT_UNRECOGNIZED_OP); |
1976 | } |
1977 | |
1978 | static int cec_feature_refused(struct cec_adapter *adap, struct cec_msg *msg) |
1979 | { |
1980 | return cec_feature_abort_reason(adap, msg, |
1981 | CEC_OP_ABORT_REFUSED); |
1982 | } |
1983 | |
1984 | /* |
1985 | * Called when a CEC message is received. This function will do any |
1986 | * necessary core processing. The is_reply bool is true if this message |
1987 | * is a reply to an earlier transmit. |
1988 | * |
1989 | * The message is either a broadcast message or a valid directed message. |
1990 | */ |
1991 | static int cec_receive_notify(struct cec_adapter *adap, struct cec_msg *msg, |
1992 | bool is_reply) |
1993 | { |
1994 | bool is_broadcast = cec_msg_is_broadcast(msg); |
1995 | u8 dest_laddr = cec_msg_destination(msg); |
1996 | u8 init_laddr = cec_msg_initiator(msg); |
1997 | u8 devtype = cec_log_addr2dev(adap, log_addr: dest_laddr); |
1998 | int la_idx = cec_log_addr2idx(adap, log_addr: dest_laddr); |
1999 | bool from_unregistered = init_laddr == 0xf; |
2000 | struct cec_msg tx_cec_msg = { }; |
2001 | |
2002 | dprintk(2, "%s: %*ph\n" , __func__, msg->len, msg->msg); |
2003 | |
2004 | /* If this is a CDC-Only device, then ignore any non-CDC messages */ |
2005 | if (cec_is_cdc_only(las: &adap->log_addrs) && |
2006 | msg->msg[1] != CEC_MSG_CDC_MESSAGE) |
2007 | return 0; |
2008 | |
2009 | /* Allow drivers to process the message first */ |
2010 | if (adap->ops->received && !adap->devnode.unregistered && |
2011 | adap->ops->received(adap, msg) != -ENOMSG) |
2012 | return 0; |
2013 | |
2014 | /* |
2015 | * REPORT_PHYSICAL_ADDR, CEC_MSG_USER_CONTROL_PRESSED and |
2016 | * CEC_MSG_USER_CONTROL_RELEASED messages always have to be |
2017 | * handled by the CEC core, even if the passthrough mode is on. |
2018 | * The others are just ignored if passthrough mode is on. |
2019 | */ |
2020 | switch (msg->msg[1]) { |
2021 | case CEC_MSG_GET_CEC_VERSION: |
2022 | case CEC_MSG_ABORT: |
2023 | case CEC_MSG_GIVE_DEVICE_POWER_STATUS: |
2024 | case CEC_MSG_GIVE_OSD_NAME: |
2025 | /* |
2026 | * These messages reply with a directed message, so ignore if |
2027 | * the initiator is Unregistered. |
2028 | */ |
2029 | if (!adap->passthrough && from_unregistered) |
2030 | return 0; |
2031 | fallthrough; |
2032 | case CEC_MSG_GIVE_DEVICE_VENDOR_ID: |
2033 | case CEC_MSG_GIVE_FEATURES: |
2034 | case CEC_MSG_GIVE_PHYSICAL_ADDR: |
2035 | /* |
2036 | * Skip processing these messages if the passthrough mode |
2037 | * is on. |
2038 | */ |
2039 | if (adap->passthrough) |
2040 | goto skip_processing; |
2041 | /* Ignore if addressing is wrong */ |
2042 | if (is_broadcast) |
2043 | return 0; |
2044 | break; |
2045 | |
2046 | case CEC_MSG_USER_CONTROL_PRESSED: |
2047 | case CEC_MSG_USER_CONTROL_RELEASED: |
2048 | /* Wrong addressing mode: don't process */ |
2049 | if (is_broadcast || from_unregistered) |
2050 | goto skip_processing; |
2051 | break; |
2052 | |
2053 | case CEC_MSG_REPORT_PHYSICAL_ADDR: |
2054 | /* |
2055 | * This message is always processed, regardless of the |
2056 | * passthrough setting. |
2057 | * |
2058 | * Exception: don't process if wrong addressing mode. |
2059 | */ |
2060 | if (!is_broadcast) |
2061 | goto skip_processing; |
2062 | break; |
2063 | |
2064 | default: |
2065 | break; |
2066 | } |
2067 | |
2068 | cec_msg_set_reply_to(msg: &tx_cec_msg, orig: msg); |
2069 | |
2070 | switch (msg->msg[1]) { |
2071 | /* The following messages are processed but still passed through */ |
2072 | case CEC_MSG_REPORT_PHYSICAL_ADDR: { |
2073 | u16 pa = (msg->msg[2] << 8) | msg->msg[3]; |
2074 | |
2075 | dprintk(1, "reported physical address %x.%x.%x.%x for logical address %d\n" , |
2076 | cec_phys_addr_exp(pa), init_laddr); |
2077 | break; |
2078 | } |
2079 | |
2080 | case CEC_MSG_USER_CONTROL_PRESSED: |
2081 | if (!(adap->capabilities & CEC_CAP_RC) || |
2082 | !(adap->log_addrs.flags & CEC_LOG_ADDRS_FL_ALLOW_RC_PASSTHRU)) |
2083 | break; |
2084 | |
2085 | #ifdef CONFIG_MEDIA_CEC_RC |
2086 | switch (msg->msg[2]) { |
2087 | /* |
2088 | * Play function, this message can have variable length |
2089 | * depending on the specific play function that is used. |
2090 | */ |
2091 | case CEC_OP_UI_CMD_PLAY_FUNCTION: |
2092 | if (msg->len == 2) |
2093 | rc_keydown(dev: adap->rc, protocol: RC_PROTO_CEC, |
2094 | scancode: msg->msg[2], toggle: 0); |
2095 | else |
2096 | rc_keydown(dev: adap->rc, protocol: RC_PROTO_CEC, |
2097 | scancode: msg->msg[2] << 8 | msg->msg[3], toggle: 0); |
2098 | break; |
2099 | /* |
2100 | * Other function messages that are not handled. |
2101 | * Currently the RC framework does not allow to supply an |
2102 | * additional parameter to a keypress. These "keys" contain |
2103 | * other information such as channel number, an input number |
2104 | * etc. |
2105 | * For the time being these messages are not processed by the |
2106 | * framework and are simply forwarded to the user space. |
2107 | */ |
2108 | case CEC_OP_UI_CMD_SELECT_BROADCAST_TYPE: |
2109 | case CEC_OP_UI_CMD_SELECT_SOUND_PRESENTATION: |
2110 | case CEC_OP_UI_CMD_TUNE_FUNCTION: |
2111 | case CEC_OP_UI_CMD_SELECT_MEDIA_FUNCTION: |
2112 | case CEC_OP_UI_CMD_SELECT_AV_INPUT_FUNCTION: |
2113 | case CEC_OP_UI_CMD_SELECT_AUDIO_INPUT_FUNCTION: |
2114 | break; |
2115 | default: |
2116 | rc_keydown(dev: adap->rc, protocol: RC_PROTO_CEC, scancode: msg->msg[2], toggle: 0); |
2117 | break; |
2118 | } |
2119 | #endif |
2120 | break; |
2121 | |
2122 | case CEC_MSG_USER_CONTROL_RELEASED: |
2123 | if (!(adap->capabilities & CEC_CAP_RC) || |
2124 | !(adap->log_addrs.flags & CEC_LOG_ADDRS_FL_ALLOW_RC_PASSTHRU)) |
2125 | break; |
2126 | #ifdef CONFIG_MEDIA_CEC_RC |
2127 | rc_keyup(dev: adap->rc); |
2128 | #endif |
2129 | break; |
2130 | |
2131 | /* |
2132 | * The remaining messages are only processed if the passthrough mode |
2133 | * is off. |
2134 | */ |
2135 | case CEC_MSG_GET_CEC_VERSION: |
2136 | cec_msg_cec_version(msg: &tx_cec_msg, cec_version: adap->log_addrs.cec_version); |
2137 | return cec_transmit_msg(adap, &tx_cec_msg, false); |
2138 | |
2139 | case CEC_MSG_GIVE_PHYSICAL_ADDR: |
2140 | /* Do nothing for CEC switches using addr 15 */ |
2141 | if (devtype == CEC_OP_PRIM_DEVTYPE_SWITCH && dest_laddr == 15) |
2142 | return 0; |
2143 | cec_msg_report_physical_addr(msg: &tx_cec_msg, phys_addr: adap->phys_addr, prim_devtype: devtype); |
2144 | return cec_transmit_msg(adap, &tx_cec_msg, false); |
2145 | |
2146 | case CEC_MSG_GIVE_DEVICE_VENDOR_ID: |
2147 | if (adap->log_addrs.vendor_id == CEC_VENDOR_ID_NONE) |
2148 | return cec_feature_abort(adap, msg); |
2149 | cec_msg_device_vendor_id(msg: &tx_cec_msg, vendor_id: adap->log_addrs.vendor_id); |
2150 | return cec_transmit_msg(adap, &tx_cec_msg, false); |
2151 | |
2152 | case CEC_MSG_ABORT: |
2153 | /* Do nothing for CEC switches */ |
2154 | if (devtype == CEC_OP_PRIM_DEVTYPE_SWITCH) |
2155 | return 0; |
2156 | return cec_feature_refused(adap, msg); |
2157 | |
2158 | case CEC_MSG_GIVE_OSD_NAME: { |
2159 | if (adap->log_addrs.osd_name[0] == 0) |
2160 | return cec_feature_abort(adap, msg); |
2161 | cec_msg_set_osd_name(msg: &tx_cec_msg, name: adap->log_addrs.osd_name); |
2162 | return cec_transmit_msg(adap, &tx_cec_msg, false); |
2163 | } |
2164 | |
2165 | case CEC_MSG_GIVE_FEATURES: |
2166 | if (adap->log_addrs.cec_version < CEC_OP_CEC_VERSION_2_0) |
2167 | return cec_feature_abort(adap, msg); |
2168 | cec_fill_msg_report_features(adap, msg: &tx_cec_msg, la_idx); |
2169 | return cec_transmit_msg(adap, &tx_cec_msg, false); |
2170 | |
2171 | default: |
2172 | /* |
2173 | * Unprocessed messages are aborted if userspace isn't doing |
2174 | * any processing either. |
2175 | */ |
2176 | if (!is_broadcast && !is_reply && !adap->follower_cnt && |
2177 | !adap->cec_follower && msg->msg[1] != CEC_MSG_FEATURE_ABORT) |
2178 | return cec_feature_abort(adap, msg); |
2179 | break; |
2180 | } |
2181 | |
2182 | skip_processing: |
2183 | /* If this was a reply, then we're done, unless otherwise specified */ |
2184 | if (is_reply && !(msg->flags & CEC_MSG_FL_REPLY_TO_FOLLOWERS)) |
2185 | return 0; |
2186 | |
2187 | /* |
2188 | * Send to the exclusive follower if there is one, otherwise send |
2189 | * to all followers. |
2190 | */ |
2191 | if (adap->cec_follower) |
2192 | cec_queue_msg_fh(fh: adap->cec_follower, msg); |
2193 | else |
2194 | cec_queue_msg_followers(adap, msg); |
2195 | return 0; |
2196 | } |
2197 | |
2198 | /* |
2199 | * Helper functions to keep track of the 'monitor all' use count. |
2200 | * |
2201 | * These functions are called with adap->lock held. |
2202 | */ |
2203 | int cec_monitor_all_cnt_inc(struct cec_adapter *adap) |
2204 | { |
2205 | int ret; |
2206 | |
2207 | if (adap->monitor_all_cnt++) |
2208 | return 0; |
2209 | |
2210 | ret = cec_adap_enable(adap); |
2211 | if (ret) |
2212 | adap->monitor_all_cnt--; |
2213 | return ret; |
2214 | } |
2215 | |
2216 | void cec_monitor_all_cnt_dec(struct cec_adapter *adap) |
2217 | { |
2218 | if (WARN_ON(!adap->monitor_all_cnt)) |
2219 | return; |
2220 | if (--adap->monitor_all_cnt) |
2221 | return; |
2222 | WARN_ON(call_op(adap, adap_monitor_all_enable, false)); |
2223 | cec_adap_enable(adap); |
2224 | } |
2225 | |
2226 | /* |
2227 | * Helper functions to keep track of the 'monitor pin' use count. |
2228 | * |
2229 | * These functions are called with adap->lock held. |
2230 | */ |
2231 | int cec_monitor_pin_cnt_inc(struct cec_adapter *adap) |
2232 | { |
2233 | int ret; |
2234 | |
2235 | if (adap->monitor_pin_cnt++) |
2236 | return 0; |
2237 | |
2238 | ret = cec_adap_enable(adap); |
2239 | if (ret) |
2240 | adap->monitor_pin_cnt--; |
2241 | return ret; |
2242 | } |
2243 | |
2244 | void cec_monitor_pin_cnt_dec(struct cec_adapter *adap) |
2245 | { |
2246 | if (WARN_ON(!adap->monitor_pin_cnt)) |
2247 | return; |
2248 | if (--adap->monitor_pin_cnt) |
2249 | return; |
2250 | WARN_ON(call_op(adap, adap_monitor_pin_enable, false)); |
2251 | cec_adap_enable(adap); |
2252 | } |
2253 | |
2254 | #ifdef CONFIG_DEBUG_FS |
2255 | /* |
2256 | * Log the current state of the CEC adapter. |
2257 | * Very useful for debugging. |
2258 | */ |
2259 | int cec_adap_status(struct seq_file *file, void *priv) |
2260 | { |
2261 | struct cec_adapter *adap = dev_get_drvdata(dev: file->private); |
2262 | struct cec_data *data; |
2263 | |
2264 | mutex_lock(&adap->lock); |
2265 | seq_printf(m: file, fmt: "enabled: %d\n" , adap->is_enabled); |
2266 | seq_printf(m: file, fmt: "configured: %d\n" , adap->is_configured); |
2267 | seq_printf(m: file, fmt: "configuring: %d\n" , adap->is_configuring); |
2268 | seq_printf(m: file, fmt: "phys_addr: %x.%x.%x.%x\n" , |
2269 | cec_phys_addr_exp(adap->phys_addr)); |
2270 | seq_printf(m: file, fmt: "number of LAs: %d\n" , adap->log_addrs.num_log_addrs); |
2271 | seq_printf(m: file, fmt: "LA mask: 0x%04x\n" , adap->log_addrs.log_addr_mask); |
2272 | if (adap->cec_follower) |
2273 | seq_printf(m: file, fmt: "has CEC follower%s\n" , |
2274 | adap->passthrough ? " (in passthrough mode)" : "" ); |
2275 | if (adap->cec_initiator) |
2276 | seq_puts(m: file, s: "has CEC initiator\n" ); |
2277 | if (adap->monitor_all_cnt) |
2278 | seq_printf(m: file, fmt: "file handles in Monitor All mode: %u\n" , |
2279 | adap->monitor_all_cnt); |
2280 | if (adap->monitor_pin_cnt) |
2281 | seq_printf(m: file, fmt: "file handles in Monitor Pin mode: %u\n" , |
2282 | adap->monitor_pin_cnt); |
2283 | if (adap->tx_timeout_cnt) { |
2284 | seq_printf(m: file, fmt: "transmit timeout count: %u\n" , |
2285 | adap->tx_timeout_cnt); |
2286 | adap->tx_timeout_cnt = 0; |
2287 | } |
2288 | if (adap->tx_low_drive_cnt) { |
2289 | seq_printf(m: file, fmt: "transmit low drive count: %u\n" , |
2290 | adap->tx_low_drive_cnt); |
2291 | adap->tx_low_drive_cnt = 0; |
2292 | } |
2293 | if (adap->tx_arb_lost_cnt) { |
2294 | seq_printf(m: file, fmt: "transmit arbitration lost count: %u\n" , |
2295 | adap->tx_arb_lost_cnt); |
2296 | adap->tx_arb_lost_cnt = 0; |
2297 | } |
2298 | if (adap->tx_error_cnt) { |
2299 | seq_printf(m: file, fmt: "transmit error count: %u\n" , |
2300 | adap->tx_error_cnt); |
2301 | adap->tx_error_cnt = 0; |
2302 | } |
2303 | data = adap->transmitting; |
2304 | if (data) |
2305 | seq_printf(m: file, fmt: "transmitting message: %*ph (reply: %02x, timeout: %ums)\n" , |
2306 | data->msg.len, data->msg.msg, data->msg.reply, |
2307 | data->msg.timeout); |
2308 | seq_printf(m: file, fmt: "pending transmits: %u\n" , adap->transmit_queue_sz); |
2309 | list_for_each_entry(data, &adap->transmit_queue, list) { |
2310 | seq_printf(m: file, fmt: "queued tx message: %*ph (reply: %02x, timeout: %ums)\n" , |
2311 | data->msg.len, data->msg.msg, data->msg.reply, |
2312 | data->msg.timeout); |
2313 | } |
2314 | list_for_each_entry(data, &adap->wait_queue, list) { |
2315 | seq_printf(m: file, fmt: "message waiting for reply: %*ph (reply: %02x, timeout: %ums)\n" , |
2316 | data->msg.len, data->msg.msg, data->msg.reply, |
2317 | data->msg.timeout); |
2318 | } |
2319 | |
2320 | call_void_op(adap, adap_status, file); |
2321 | mutex_unlock(lock: &adap->lock); |
2322 | return 0; |
2323 | } |
2324 | #endif |
2325 | |