1 // SPDX-License-Identifier: GPL-2.0-only
3 * cec-adap.c - HDMI Consumer Electronics Control framework - CEC adapter
5 * Copyright 2016 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
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>
16 #include <linux/string.h>
17 #include <linux/types.h>
19 #include <drm/drm_connector.h>
20 #include <drm/drm_device.h>
21 #include <drm/drm_edid.h>
22 #include <drm/drm_file.h>
26 static void cec_fill_msg_report_features(struct cec_adapter *adap,
31 * 400 ms is the time it takes for one 16 byte message to be
32 * transferred and 5 is the maximum number of retries. Add
33 * another 100 ms as a margin. So if the transmit doesn't
34 * finish before that time something is really wrong and we
37 * This is a sign that something it really wrong and a warning
40 #define CEC_XFER_TIMEOUT_MS (5 * 400 + 100)
42 #define call_op(adap, op, arg...) \
43 (adap->ops->op ? adap->ops->op(adap, ## arg) : 0)
45 #define call_void_op(adap, op, arg...) \
48 adap->ops->op(adap, ## arg); \
51 static int cec_log_addr2idx(const struct cec_adapter *adap, u8 log_addr)
55 for (i = 0; i < adap->log_addrs.num_log_addrs; i++)
56 if (adap->log_addrs.log_addr[i] == log_addr)
61 static unsigned int cec_log_addr2dev(const struct cec_adapter *adap, u8 log_addr)
63 int i = cec_log_addr2idx(adap, log_addr);
65 return adap->log_addrs.primary_device_type[i < 0 ? 0 : i];
68 u16 cec_get_edid_phys_addr(const u8 *edid, unsigned int size,
71 unsigned int loc = cec_get_edid_spa_location(edid, size);
76 return CEC_PHYS_ADDR_INVALID;
77 return (edid[loc] << 8) | edid[loc + 1];
79 EXPORT_SYMBOL_GPL(cec_get_edid_phys_addr);
81 void cec_fill_conn_info_from_drm(struct cec_connector_info *conn_info,
82 const struct drm_connector *connector)
84 memset(conn_info, 0, sizeof(*conn_info));
85 conn_info->type = CEC_CONNECTOR_TYPE_DRM;
86 conn_info->drm.card_no = connector->dev->primary->index;
87 conn_info->drm.connector_id = connector->base.id;
89 EXPORT_SYMBOL_GPL(cec_fill_conn_info_from_drm);
92 * Queue a new event for this filehandle. If ts == 0, then set it
93 * to the current time.
95 * We keep a queue of at most max_event events where max_event differs
96 * per event. If the queue becomes full, then drop the oldest event and
97 * keep track of how many events we've dropped.
99 void cec_queue_event_fh(struct cec_fh *fh,
100 const struct cec_event *new_ev, u64 ts)
102 static const u16 max_events[CEC_NUM_EVENTS] = {
103 1, 1, 800, 800, 8, 8, 8, 8
105 struct cec_event_entry *entry;
106 unsigned int ev_idx = new_ev->event - 1;
108 if (WARN_ON(ev_idx >= ARRAY_SIZE(fh->events)))
114 mutex_lock(&fh->lock);
115 if (ev_idx < CEC_NUM_CORE_EVENTS)
116 entry = &fh->core_events[ev_idx];
118 entry = kmalloc(sizeof(*entry), GFP_KERNEL);
120 if (new_ev->event == CEC_EVENT_LOST_MSGS &&
121 fh->queued_events[ev_idx]) {
122 entry->ev.lost_msgs.lost_msgs +=
123 new_ev->lost_msgs.lost_msgs;
129 if (fh->queued_events[ev_idx] < max_events[ev_idx]) {
130 /* Add new msg at the end of the queue */
131 list_add_tail(&entry->list, &fh->events[ev_idx]);
132 fh->queued_events[ev_idx]++;
133 fh->total_queued_events++;
137 if (ev_idx >= CEC_NUM_CORE_EVENTS) {
138 list_add_tail(&entry->list, &fh->events[ev_idx]);
139 /* drop the oldest event */
140 entry = list_first_entry(&fh->events[ev_idx],
141 struct cec_event_entry, list);
142 list_del(&entry->list);
146 /* Mark that events were lost */
147 entry = list_first_entry_or_null(&fh->events[ev_idx],
148 struct cec_event_entry, list);
150 entry->ev.flags |= CEC_EVENT_FL_DROPPED_EVENTS;
153 mutex_unlock(&fh->lock);
154 wake_up_interruptible(&fh->wait);
157 /* Queue a new event for all open filehandles. */
158 static void cec_queue_event(struct cec_adapter *adap,
159 const struct cec_event *ev)
161 u64 ts = ktime_get_ns();
164 mutex_lock(&adap->devnode.lock);
165 list_for_each_entry(fh, &adap->devnode.fhs, list)
166 cec_queue_event_fh(fh, ev, ts);
167 mutex_unlock(&adap->devnode.lock);
170 /* Notify userspace that the CEC pin changed state at the given time. */
171 void cec_queue_pin_cec_event(struct cec_adapter *adap, bool is_high,
172 bool dropped_events, ktime_t ts)
174 struct cec_event ev = {
175 .event = is_high ? CEC_EVENT_PIN_CEC_HIGH :
176 CEC_EVENT_PIN_CEC_LOW,
177 .flags = dropped_events ? CEC_EVENT_FL_DROPPED_EVENTS : 0,
181 mutex_lock(&adap->devnode.lock);
182 list_for_each_entry(fh, &adap->devnode.fhs, list)
183 if (fh->mode_follower == CEC_MODE_MONITOR_PIN)
184 cec_queue_event_fh(fh, &ev, ktime_to_ns(ts));
185 mutex_unlock(&adap->devnode.lock);
187 EXPORT_SYMBOL_GPL(cec_queue_pin_cec_event);
189 /* Notify userspace that the HPD pin changed state at the given time. */
190 void cec_queue_pin_hpd_event(struct cec_adapter *adap, bool is_high, ktime_t ts)
192 struct cec_event ev = {
193 .event = is_high ? CEC_EVENT_PIN_HPD_HIGH :
194 CEC_EVENT_PIN_HPD_LOW,
198 mutex_lock(&adap->devnode.lock);
199 list_for_each_entry(fh, &adap->devnode.fhs, list)
200 cec_queue_event_fh(fh, &ev, ktime_to_ns(ts));
201 mutex_unlock(&adap->devnode.lock);
203 EXPORT_SYMBOL_GPL(cec_queue_pin_hpd_event);
205 /* Notify userspace that the 5V pin changed state at the given time. */
206 void cec_queue_pin_5v_event(struct cec_adapter *adap, bool is_high, ktime_t ts)
208 struct cec_event ev = {
209 .event = is_high ? CEC_EVENT_PIN_5V_HIGH :
210 CEC_EVENT_PIN_5V_LOW,
214 mutex_lock(&adap->devnode.lock);
215 list_for_each_entry(fh, &adap->devnode.fhs, list)
216 cec_queue_event_fh(fh, &ev, ktime_to_ns(ts));
217 mutex_unlock(&adap->devnode.lock);
219 EXPORT_SYMBOL_GPL(cec_queue_pin_5v_event);
222 * Queue a new message for this filehandle.
224 * We keep a queue of at most CEC_MAX_MSG_RX_QUEUE_SZ messages. If the
225 * queue becomes full, then drop the oldest message and keep track
226 * of how many messages we've dropped.
228 static void cec_queue_msg_fh(struct cec_fh *fh, const struct cec_msg *msg)
230 static const struct cec_event ev_lost_msgs = {
231 .event = CEC_EVENT_LOST_MSGS,
237 struct cec_msg_entry *entry;
239 mutex_lock(&fh->lock);
240 entry = kmalloc(sizeof(*entry), GFP_KERNEL);
243 /* Add new msg at the end of the queue */
244 list_add_tail(&entry->list, &fh->msgs);
246 if (fh->queued_msgs < CEC_MAX_MSG_RX_QUEUE_SZ) {
247 /* All is fine if there is enough room */
249 mutex_unlock(&fh->lock);
250 wake_up_interruptible(&fh->wait);
255 * if the message queue is full, then drop the oldest one and
256 * send a lost message event.
258 entry = list_first_entry(&fh->msgs, struct cec_msg_entry, list);
259 list_del(&entry->list);
262 mutex_unlock(&fh->lock);
265 * We lost a message, either because kmalloc failed or the queue
268 cec_queue_event_fh(fh, &ev_lost_msgs, ktime_get_ns());
272 * Queue the message for those filehandles that are in monitor mode.
273 * If valid_la is true (this message is for us or was sent by us),
274 * then pass it on to any monitoring filehandle. If this message
275 * isn't for us or from us, then only give it to filehandles that
276 * are in MONITOR_ALL mode.
278 * This can only happen if the CEC_CAP_MONITOR_ALL capability is
279 * set and the CEC adapter was placed in 'monitor all' mode.
281 static void cec_queue_msg_monitor(struct cec_adapter *adap,
282 const struct cec_msg *msg,
286 u32 monitor_mode = valid_la ? CEC_MODE_MONITOR :
287 CEC_MODE_MONITOR_ALL;
289 mutex_lock(&adap->devnode.lock);
290 list_for_each_entry(fh, &adap->devnode.fhs, list) {
291 if (fh->mode_follower >= monitor_mode)
292 cec_queue_msg_fh(fh, msg);
294 mutex_unlock(&adap->devnode.lock);
298 * Queue the message for follower filehandles.
300 static void cec_queue_msg_followers(struct cec_adapter *adap,
301 const struct cec_msg *msg)
305 mutex_lock(&adap->devnode.lock);
306 list_for_each_entry(fh, &adap->devnode.fhs, list) {
307 if (fh->mode_follower == CEC_MODE_FOLLOWER)
308 cec_queue_msg_fh(fh, msg);
310 mutex_unlock(&adap->devnode.lock);
313 /* Notify userspace of an adapter state change. */
314 static void cec_post_state_event(struct cec_adapter *adap)
316 struct cec_event ev = {
317 .event = CEC_EVENT_STATE_CHANGE,
320 ev.state_change.phys_addr = adap->phys_addr;
321 ev.state_change.log_addr_mask = adap->log_addrs.log_addr_mask;
322 cec_queue_event(adap, &ev);
326 * A CEC transmit (and a possible wait for reply) completed.
327 * If this was in blocking mode, then complete it, otherwise
328 * queue the message for userspace to dequeue later.
330 * This function is called with adap->lock held.
332 static void cec_data_completed(struct cec_data *data)
335 * Delete this transmit from the filehandle's xfer_list since
336 * we're done with it.
338 * Note that if the filehandle is closed before this transmit
339 * finished, then the release() function will set data->fh to NULL.
340 * Without that we would be referring to a closed filehandle.
343 list_del(&data->xfer_list);
345 if (data->blocking) {
347 * Someone is blocking so mark the message as completed
350 data->completed = true;
354 * No blocking, so just queue the message if needed and
358 cec_queue_msg_fh(data->fh, &data->msg);
364 * A pending CEC transmit needs to be cancelled, either because the CEC
365 * adapter is disabled or the transmit takes an impossibly long time to
368 * This function is called with adap->lock held.
370 static void cec_data_cancel(struct cec_data *data, u8 tx_status)
373 * It's either the current transmit, or it is a pending
374 * transmit. Take the appropriate action to clear it.
376 if (data->adap->transmitting == data) {
377 data->adap->transmitting = NULL;
379 list_del_init(&data->list);
380 if (!(data->msg.tx_status & CEC_TX_STATUS_OK))
381 if (!WARN_ON(!data->adap->transmit_queue_sz))
382 data->adap->transmit_queue_sz--;
385 if (data->msg.tx_status & CEC_TX_STATUS_OK) {
386 data->msg.rx_ts = ktime_get_ns();
387 data->msg.rx_status = CEC_RX_STATUS_ABORTED;
389 data->msg.tx_ts = ktime_get_ns();
390 data->msg.tx_status |= tx_status |
391 CEC_TX_STATUS_MAX_RETRIES;
392 data->msg.tx_error_cnt++;
396 /* Queue transmitted message for monitoring purposes */
397 cec_queue_msg_monitor(data->adap, &data->msg, 1);
399 cec_data_completed(data);
403 * Flush all pending transmits and cancel any pending timeout work.
405 * This function is called with adap->lock held.
407 static void cec_flush(struct cec_adapter *adap)
409 struct cec_data *data, *n;
412 * If the adapter is disabled, or we're asked to stop,
413 * then cancel any pending transmits.
415 while (!list_empty(&adap->transmit_queue)) {
416 data = list_first_entry(&adap->transmit_queue,
417 struct cec_data, list);
418 cec_data_cancel(data, CEC_TX_STATUS_ABORTED);
420 if (adap->transmitting)
421 cec_data_cancel(adap->transmitting, CEC_TX_STATUS_ABORTED);
423 /* Cancel the pending timeout work. */
424 list_for_each_entry_safe(data, n, &adap->wait_queue, list) {
425 if (cancel_delayed_work(&data->work))
426 cec_data_cancel(data, CEC_TX_STATUS_OK);
428 * If cancel_delayed_work returned false, then
429 * the cec_wait_timeout function is running,
430 * which will call cec_data_completed. So no
431 * need to do anything special in that case.
435 * If something went wrong and this counter isn't what it should
436 * be, then this will reset it back to 0. Warn if it is not 0,
437 * since it indicates a bug, either in this framework or in a
440 if (WARN_ON(adap->transmit_queue_sz))
441 adap->transmit_queue_sz = 0;
445 * Main CEC state machine
447 * Wait until the thread should be stopped, or we are not transmitting and
448 * a new transmit message is queued up, in which case we start transmitting
449 * that message. When the adapter finished transmitting the message it will
450 * call cec_transmit_done().
452 * If the adapter is disabled, then remove all queued messages instead.
454 * If the current transmit times out, then cancel that transmit.
456 int cec_thread_func(void *_adap)
458 struct cec_adapter *adap = _adap;
461 unsigned int signal_free_time;
462 struct cec_data *data;
463 bool timeout = false;
466 if (adap->transmit_in_progress) {
470 * We are transmitting a message, so add a timeout
471 * to prevent the state machine to get stuck waiting
472 * for this message to finalize and add a check to
473 * see if the adapter is disabled in which case the
474 * transmit should be canceled.
476 err = wait_event_interruptible_timeout(adap->kthread_waitq,
478 (!adap->is_configured && !adap->is_configuring)) ||
479 kthread_should_stop() ||
480 (!adap->transmit_in_progress &&
481 !list_empty(&adap->transmit_queue)),
482 msecs_to_jiffies(CEC_XFER_TIMEOUT_MS));
485 /* Otherwise we just wait for something to happen. */
486 wait_event_interruptible(adap->kthread_waitq,
487 kthread_should_stop() ||
488 (!adap->transmit_in_progress &&
489 !list_empty(&adap->transmit_queue)));
492 mutex_lock(&adap->lock);
494 if ((adap->needs_hpd &&
495 (!adap->is_configured && !adap->is_configuring)) ||
496 kthread_should_stop()) {
501 if (adap->transmit_in_progress && timeout) {
503 * If we timeout, then log that. Normally this does
504 * not happen and it is an indication of a faulty CEC
505 * adapter driver, or the CEC bus is in some weird
506 * state. On rare occasions it can happen if there is
507 * so much traffic on the bus that the adapter was
508 * unable to transmit for CEC_XFER_TIMEOUT_MS (2.1s).
510 if (adap->transmitting) {
511 pr_warn("cec-%s: message %*ph timed out\n", adap->name,
512 adap->transmitting->msg.len,
513 adap->transmitting->msg.msg);
514 /* Just give up on this. */
515 cec_data_cancel(adap->transmitting,
516 CEC_TX_STATUS_TIMEOUT);
518 pr_warn("cec-%s: transmit timed out\n", adap->name);
520 adap->transmit_in_progress = false;
526 * If we are still transmitting, or there is nothing new to
527 * transmit, then just continue waiting.
529 if (adap->transmit_in_progress || list_empty(&adap->transmit_queue))
532 /* Get a new message to transmit */
533 data = list_first_entry(&adap->transmit_queue,
534 struct cec_data, list);
535 list_del_init(&data->list);
536 if (!WARN_ON(!data->adap->transmit_queue_sz))
537 adap->transmit_queue_sz--;
539 /* Make this the current transmitting message */
540 adap->transmitting = data;
543 * Suggested number of attempts as per the CEC 2.0 spec:
544 * 4 attempts is the default, except for 'secondary poll
545 * messages', i.e. poll messages not sent during the adapter
546 * configuration phase when it allocates logical addresses.
548 if (data->msg.len == 1 && adap->is_configured)
553 /* Set the suggested signal free time */
554 if (data->attempts) {
555 /* should be >= 3 data bit periods for a retry */
556 signal_free_time = CEC_SIGNAL_FREE_TIME_RETRY;
557 } else if (adap->last_initiator !=
558 cec_msg_initiator(&data->msg)) {
559 /* should be >= 5 data bit periods for new initiator */
560 signal_free_time = CEC_SIGNAL_FREE_TIME_NEW_INITIATOR;
561 adap->last_initiator = cec_msg_initiator(&data->msg);
564 * should be >= 7 data bit periods for sending another
565 * frame immediately after another.
567 signal_free_time = CEC_SIGNAL_FREE_TIME_NEXT_XFER;
569 if (data->attempts == 0)
570 data->attempts = attempts;
572 /* Tell the adapter to transmit, cancel on error */
573 if (adap->ops->adap_transmit(adap, data->attempts,
574 signal_free_time, &data->msg))
575 cec_data_cancel(data, CEC_TX_STATUS_ABORTED);
577 adap->transmit_in_progress = true;
580 mutex_unlock(&adap->lock);
582 if (kthread_should_stop())
589 * Called by the CEC adapter if a transmit finished.
591 void cec_transmit_done_ts(struct cec_adapter *adap, u8 status,
592 u8 arb_lost_cnt, u8 nack_cnt, u8 low_drive_cnt,
593 u8 error_cnt, ktime_t ts)
595 struct cec_data *data;
597 unsigned int attempts_made = arb_lost_cnt + nack_cnt +
598 low_drive_cnt + error_cnt;
600 dprintk(2, "%s: status 0x%02x\n", __func__, status);
601 if (attempts_made < 1)
604 mutex_lock(&adap->lock);
605 data = adap->transmitting;
608 * This might happen if a transmit was issued and the cable is
609 * unplugged while the transmit is ongoing. Ignore this
610 * transmit in that case.
612 if (!adap->transmit_in_progress)
613 dprintk(1, "%s was called without an ongoing transmit!\n",
615 adap->transmit_in_progress = false;
618 adap->transmit_in_progress = false;
622 /* Drivers must fill in the status! */
623 WARN_ON(status == 0);
624 msg->tx_ts = ktime_to_ns(ts);
625 msg->tx_status |= status;
626 msg->tx_arb_lost_cnt += arb_lost_cnt;
627 msg->tx_nack_cnt += nack_cnt;
628 msg->tx_low_drive_cnt += low_drive_cnt;
629 msg->tx_error_cnt += error_cnt;
631 /* Mark that we're done with this transmit */
632 adap->transmitting = NULL;
635 * If there are still retry attempts left and there was an error and
636 * the hardware didn't signal that it retried itself (by setting
637 * CEC_TX_STATUS_MAX_RETRIES), then we will retry ourselves.
639 if (data->attempts > attempts_made &&
640 !(status & (CEC_TX_STATUS_MAX_RETRIES | CEC_TX_STATUS_OK))) {
641 /* Retry this message */
642 data->attempts -= attempts_made;
644 dprintk(2, "retransmit: %*ph (attempts: %d, wait for 0x%02x)\n",
645 msg->len, msg->msg, data->attempts, msg->reply);
647 dprintk(2, "retransmit: %*ph (attempts: %d)\n",
648 msg->len, msg->msg, data->attempts);
649 /* Add the message in front of the transmit queue */
650 list_add(&data->list, &adap->transmit_queue);
651 adap->transmit_queue_sz++;
657 /* Always set CEC_TX_STATUS_MAX_RETRIES on error */
658 if (!(status & CEC_TX_STATUS_OK))
659 msg->tx_status |= CEC_TX_STATUS_MAX_RETRIES;
661 /* Queue transmitted message for monitoring purposes */
662 cec_queue_msg_monitor(adap, msg, 1);
664 if ((status & CEC_TX_STATUS_OK) && adap->is_configured &&
667 * Queue the message into the wait queue if we want to wait
670 list_add_tail(&data->list, &adap->wait_queue);
671 schedule_delayed_work(&data->work,
672 msecs_to_jiffies(msg->timeout));
674 /* Otherwise we're done */
675 cec_data_completed(data);
680 * Wake up the main thread to see if another message is ready
681 * for transmitting or to retry the current message.
683 wake_up_interruptible(&adap->kthread_waitq);
684 mutex_unlock(&adap->lock);
686 EXPORT_SYMBOL_GPL(cec_transmit_done_ts);
688 void cec_transmit_attempt_done_ts(struct cec_adapter *adap,
689 u8 status, ktime_t ts)
691 switch (status & ~CEC_TX_STATUS_MAX_RETRIES) {
692 case CEC_TX_STATUS_OK:
693 cec_transmit_done_ts(adap, status, 0, 0, 0, 0, ts);
695 case CEC_TX_STATUS_ARB_LOST:
696 cec_transmit_done_ts(adap, status, 1, 0, 0, 0, ts);
698 case CEC_TX_STATUS_NACK:
699 cec_transmit_done_ts(adap, status, 0, 1, 0, 0, ts);
701 case CEC_TX_STATUS_LOW_DRIVE:
702 cec_transmit_done_ts(adap, status, 0, 0, 1, 0, ts);
704 case CEC_TX_STATUS_ERROR:
705 cec_transmit_done_ts(adap, status, 0, 0, 0, 1, ts);
708 /* Should never happen */
709 WARN(1, "cec-%s: invalid status 0x%02x\n", adap->name, status);
713 EXPORT_SYMBOL_GPL(cec_transmit_attempt_done_ts);
716 * Called when waiting for a reply times out.
718 static void cec_wait_timeout(struct work_struct *work)
720 struct cec_data *data = container_of(work, struct cec_data, work.work);
721 struct cec_adapter *adap = data->adap;
723 mutex_lock(&adap->lock);
725 * Sanity check in case the timeout and the arrival of the message
726 * happened at the same time.
728 if (list_empty(&data->list))
731 /* Mark the message as timed out */
732 list_del_init(&data->list);
733 data->msg.rx_ts = ktime_get_ns();
734 data->msg.rx_status = CEC_RX_STATUS_TIMEOUT;
735 cec_data_completed(data);
737 mutex_unlock(&adap->lock);
741 * Transmit a message. The fh argument may be NULL if the transmit is not
742 * associated with a specific filehandle.
744 * This function is called with adap->lock held.
746 int cec_transmit_msg_fh(struct cec_adapter *adap, struct cec_msg *msg,
747 struct cec_fh *fh, bool block)
749 struct cec_data *data;
750 bool is_raw = msg_is_raw(msg);
756 msg->tx_arb_lost_cnt = 0;
757 msg->tx_nack_cnt = 0;
758 msg->tx_low_drive_cnt = 0;
759 msg->tx_error_cnt = 0;
762 if (msg->reply && msg->timeout == 0) {
763 /* Make sure the timeout isn't 0. */
766 msg->flags &= CEC_MSG_FL_REPLY_TO_FOLLOWERS | CEC_MSG_FL_RAW;
769 msg->flags &= ~CEC_MSG_FL_REPLY_TO_FOLLOWERS;
772 if (msg->len == 0 || msg->len > CEC_MAX_MSG_SIZE) {
773 dprintk(1, "%s: invalid length %d\n", __func__, msg->len);
777 memset(msg->msg + msg->len, 0, sizeof(msg->msg) - msg->len);
780 dprintk(2, "%s: %*ph (wait for 0x%02x%s)\n",
781 __func__, msg->len, msg->msg, msg->reply,
782 !block ? ", nb" : "");
784 dprintk(2, "%s: %*ph%s\n",
785 __func__, msg->len, msg->msg, !block ? " (nb)" : "");
787 if (msg->timeout && msg->len == 1) {
788 dprintk(1, "%s: can't reply to poll msg\n", __func__);
793 if (!capable(CAP_SYS_RAWIO))
796 /* A CDC-Only device can only send CDC messages */
797 if ((adap->log_addrs.flags & CEC_LOG_ADDRS_FL_CDC_ONLY) &&
798 (msg->len == 1 || msg->msg[1] != CEC_MSG_CDC_MESSAGE)) {
799 dprintk(1, "%s: not a CDC message\n", __func__);
803 if (msg->len >= 4 && msg->msg[1] == CEC_MSG_CDC_MESSAGE) {
804 msg->msg[2] = adap->phys_addr >> 8;
805 msg->msg[3] = adap->phys_addr & 0xff;
809 if (cec_msg_destination(msg) == 0xf) {
810 dprintk(1, "%s: invalid poll message\n",
814 if (cec_has_log_addr(adap, cec_msg_destination(msg))) {
816 * If the destination is a logical address our
817 * adapter has already claimed, then just NACK
818 * this. It depends on the hardware what it will
819 * do with a POLL to itself (some OK this), so
820 * it is just as easy to handle it here so the
821 * behavior will be consistent.
823 msg->tx_ts = ktime_get_ns();
824 msg->tx_status = CEC_TX_STATUS_NACK |
825 CEC_TX_STATUS_MAX_RETRIES;
826 msg->tx_nack_cnt = 1;
827 msg->sequence = ++adap->sequence;
829 msg->sequence = ++adap->sequence;
833 if (msg->len > 1 && !cec_msg_is_broadcast(msg) &&
834 cec_has_log_addr(adap, cec_msg_destination(msg))) {
835 dprintk(1, "%s: destination is the adapter itself\n",
839 if (msg->len > 1 && adap->is_configured &&
840 !cec_has_log_addr(adap, cec_msg_initiator(msg))) {
841 dprintk(1, "%s: initiator has unknown logical address %d\n",
842 __func__, cec_msg_initiator(msg));
846 * Special case: allow Ping and IMAGE/TEXT_VIEW_ON to be
847 * transmitted to a TV, even if the adapter is unconfigured.
848 * This makes it possible to detect or wake up displays that
849 * pull down the HPD when in standby.
851 if (!adap->is_configured && !adap->is_configuring &&
853 cec_msg_destination(msg) != CEC_LOG_ADDR_TV ||
854 (msg->len == 2 && msg->msg[1] != CEC_MSG_IMAGE_VIEW_ON &&
855 msg->msg[1] != CEC_MSG_TEXT_VIEW_ON))) {
856 dprintk(1, "%s: adapter is unconfigured\n", __func__);
861 if (!adap->is_configured && !adap->is_configuring) {
862 if (adap->needs_hpd) {
863 dprintk(1, "%s: adapter is unconfigured and needs HPD\n",
868 dprintk(1, "%s: invalid msg->reply\n", __func__);
873 if (adap->transmit_queue_sz >= CEC_MAX_MSG_TX_QUEUE_SZ) {
874 dprintk(2, "%s: transmit queue full\n", __func__);
878 data = kzalloc(sizeof(*data), GFP_KERNEL);
882 msg->sequence = ++adap->sequence;
884 msg->sequence = ++adap->sequence;
889 data->blocking = block;
891 init_completion(&data->c);
892 INIT_DELAYED_WORK(&data->work, cec_wait_timeout);
895 list_add_tail(&data->xfer_list, &fh->xfer_list);
897 list_add_tail(&data->list, &adap->transmit_queue);
898 adap->transmit_queue_sz++;
899 if (!adap->transmitting)
900 wake_up_interruptible(&adap->kthread_waitq);
902 /* All done if we don't need to block waiting for completion */
907 * Release the lock and wait, retake the lock afterwards.
909 mutex_unlock(&adap->lock);
910 wait_for_completion_killable(&data->c);
911 if (!data->completed)
912 cancel_delayed_work_sync(&data->work);
913 mutex_lock(&adap->lock);
915 /* Cancel the transmit if it was interrupted */
916 if (!data->completed)
917 cec_data_cancel(data, CEC_TX_STATUS_ABORTED);
919 /* The transmit completed (possibly with an error) */
925 /* Helper function to be used by drivers and this framework. */
926 int cec_transmit_msg(struct cec_adapter *adap, struct cec_msg *msg,
931 mutex_lock(&adap->lock);
932 ret = cec_transmit_msg_fh(adap, msg, NULL, block);
933 mutex_unlock(&adap->lock);
936 EXPORT_SYMBOL_GPL(cec_transmit_msg);
939 * I don't like forward references but without this the low-level
940 * cec_received_msg() function would come after a bunch of high-level
941 * CEC protocol handling functions. That was very confusing.
943 static int cec_receive_notify(struct cec_adapter *adap, struct cec_msg *msg,
946 #define DIRECTED 0x80
947 #define BCAST1_4 0x40
948 #define BCAST2_0 0x20 /* broadcast only allowed for >= 2.0 */
949 #define BCAST (BCAST1_4 | BCAST2_0)
950 #define BOTH (BCAST | DIRECTED)
953 * Specify minimum length and whether the message is directed, broadcast
954 * or both. Messages that do not match the criteria are ignored as per
955 * the CEC specification.
957 static const u8 cec_msg_size[256] = {
958 [CEC_MSG_ACTIVE_SOURCE] = 4 | BCAST,
959 [CEC_MSG_IMAGE_VIEW_ON] = 2 | DIRECTED,
960 [CEC_MSG_TEXT_VIEW_ON] = 2 | DIRECTED,
961 [CEC_MSG_INACTIVE_SOURCE] = 4 | DIRECTED,
962 [CEC_MSG_REQUEST_ACTIVE_SOURCE] = 2 | BCAST,
963 [CEC_MSG_ROUTING_CHANGE] = 6 | BCAST,
964 [CEC_MSG_ROUTING_INFORMATION] = 4 | BCAST,
965 [CEC_MSG_SET_STREAM_PATH] = 4 | BCAST,
966 [CEC_MSG_STANDBY] = 2 | BOTH,
967 [CEC_MSG_RECORD_OFF] = 2 | DIRECTED,
968 [CEC_MSG_RECORD_ON] = 3 | DIRECTED,
969 [CEC_MSG_RECORD_STATUS] = 3 | DIRECTED,
970 [CEC_MSG_RECORD_TV_SCREEN] = 2 | DIRECTED,
971 [CEC_MSG_CLEAR_ANALOGUE_TIMER] = 13 | DIRECTED,
972 [CEC_MSG_CLEAR_DIGITAL_TIMER] = 16 | DIRECTED,
973 [CEC_MSG_CLEAR_EXT_TIMER] = 13 | DIRECTED,
974 [CEC_MSG_SET_ANALOGUE_TIMER] = 13 | DIRECTED,
975 [CEC_MSG_SET_DIGITAL_TIMER] = 16 | DIRECTED,
976 [CEC_MSG_SET_EXT_TIMER] = 13 | DIRECTED,
977 [CEC_MSG_SET_TIMER_PROGRAM_TITLE] = 2 | DIRECTED,
978 [CEC_MSG_TIMER_CLEARED_STATUS] = 3 | DIRECTED,
979 [CEC_MSG_TIMER_STATUS] = 3 | DIRECTED,
980 [CEC_MSG_CEC_VERSION] = 3 | DIRECTED,
981 [CEC_MSG_GET_CEC_VERSION] = 2 | DIRECTED,
982 [CEC_MSG_GIVE_PHYSICAL_ADDR] = 2 | DIRECTED,
983 [CEC_MSG_GET_MENU_LANGUAGE] = 2 | DIRECTED,
984 [CEC_MSG_REPORT_PHYSICAL_ADDR] = 5 | BCAST,
985 [CEC_MSG_SET_MENU_LANGUAGE] = 5 | BCAST,
986 [CEC_MSG_REPORT_FEATURES] = 6 | BCAST,
987 [CEC_MSG_GIVE_FEATURES] = 2 | DIRECTED,
988 [CEC_MSG_DECK_CONTROL] = 3 | DIRECTED,
989 [CEC_MSG_DECK_STATUS] = 3 | DIRECTED,
990 [CEC_MSG_GIVE_DECK_STATUS] = 3 | DIRECTED,
991 [CEC_MSG_PLAY] = 3 | DIRECTED,
992 [CEC_MSG_GIVE_TUNER_DEVICE_STATUS] = 3 | DIRECTED,
993 [CEC_MSG_SELECT_ANALOGUE_SERVICE] = 6 | DIRECTED,
994 [CEC_MSG_SELECT_DIGITAL_SERVICE] = 9 | DIRECTED,
995 [CEC_MSG_TUNER_DEVICE_STATUS] = 7 | DIRECTED,
996 [CEC_MSG_TUNER_STEP_DECREMENT] = 2 | DIRECTED,
997 [CEC_MSG_TUNER_STEP_INCREMENT] = 2 | DIRECTED,
998 [CEC_MSG_DEVICE_VENDOR_ID] = 5 | BCAST,
999 [CEC_MSG_GIVE_DEVICE_VENDOR_ID] = 2 | DIRECTED,
1000 [CEC_MSG_VENDOR_COMMAND] = 2 | DIRECTED,
1001 [CEC_MSG_VENDOR_COMMAND_WITH_ID] = 5 | BOTH,
1002 [CEC_MSG_VENDOR_REMOTE_BUTTON_DOWN] = 2 | BOTH,
1003 [CEC_MSG_VENDOR_REMOTE_BUTTON_UP] = 2 | BOTH,
1004 [CEC_MSG_SET_OSD_STRING] = 3 | DIRECTED,
1005 [CEC_MSG_GIVE_OSD_NAME] = 2 | DIRECTED,
1006 [CEC_MSG_SET_OSD_NAME] = 2 | DIRECTED,
1007 [CEC_MSG_MENU_REQUEST] = 3 | DIRECTED,
1008 [CEC_MSG_MENU_STATUS] = 3 | DIRECTED,
1009 [CEC_MSG_USER_CONTROL_PRESSED] = 3 | DIRECTED,
1010 [CEC_MSG_USER_CONTROL_RELEASED] = 2 | DIRECTED,
1011 [CEC_MSG_GIVE_DEVICE_POWER_STATUS] = 2 | DIRECTED,
1012 [CEC_MSG_REPORT_POWER_STATUS] = 3 | DIRECTED | BCAST2_0,
1013 [CEC_MSG_FEATURE_ABORT] = 4 | DIRECTED,
1014 [CEC_MSG_ABORT] = 2 | DIRECTED,
1015 [CEC_MSG_GIVE_AUDIO_STATUS] = 2 | DIRECTED,
1016 [CEC_MSG_GIVE_SYSTEM_AUDIO_MODE_STATUS] = 2 | DIRECTED,
1017 [CEC_MSG_REPORT_AUDIO_STATUS] = 3 | DIRECTED,
1018 [CEC_MSG_REPORT_SHORT_AUDIO_DESCRIPTOR] = 2 | DIRECTED,
1019 [CEC_MSG_REQUEST_SHORT_AUDIO_DESCRIPTOR] = 2 | DIRECTED,
1020 [CEC_MSG_SET_SYSTEM_AUDIO_MODE] = 3 | BOTH,
1021 [CEC_MSG_SYSTEM_AUDIO_MODE_REQUEST] = 2 | DIRECTED,
1022 [CEC_MSG_SYSTEM_AUDIO_MODE_STATUS] = 3 | DIRECTED,
1023 [CEC_MSG_SET_AUDIO_RATE] = 3 | DIRECTED,
1024 [CEC_MSG_INITIATE_ARC] = 2 | DIRECTED,
1025 [CEC_MSG_REPORT_ARC_INITIATED] = 2 | DIRECTED,
1026 [CEC_MSG_REPORT_ARC_TERMINATED] = 2 | DIRECTED,
1027 [CEC_MSG_REQUEST_ARC_INITIATION] = 2 | DIRECTED,
1028 [CEC_MSG_REQUEST_ARC_TERMINATION] = 2 | DIRECTED,
1029 [CEC_MSG_TERMINATE_ARC] = 2 | DIRECTED,
1030 [CEC_MSG_REQUEST_CURRENT_LATENCY] = 4 | BCAST,
1031 [CEC_MSG_REPORT_CURRENT_LATENCY] = 6 | BCAST,
1032 [CEC_MSG_CDC_MESSAGE] = 2 | BCAST,
1035 /* Called by the CEC adapter if a message is received */
1036 void cec_received_msg_ts(struct cec_adapter *adap,
1037 struct cec_msg *msg, ktime_t ts)
1039 struct cec_data *data;
1040 u8 msg_init = cec_msg_initiator(msg);
1041 u8 msg_dest = cec_msg_destination(msg);
1042 u8 cmd = msg->msg[1];
1043 bool is_reply = false;
1044 bool valid_la = true;
1047 if (WARN_ON(!msg->len || msg->len > CEC_MAX_MSG_SIZE))
1051 * Some CEC adapters will receive the messages that they transmitted.
1052 * This test filters out those messages by checking if we are the
1053 * initiator, and just returning in that case.
1055 * Note that this won't work if this is an Unregistered device.
1057 * It is bad practice if the hardware receives the message that it
1058 * transmitted and luckily most CEC adapters behave correctly in this
1061 if (msg_init != CEC_LOG_ADDR_UNREGISTERED &&
1062 cec_has_log_addr(adap, msg_init))
1065 msg->rx_ts = ktime_to_ns(ts);
1066 msg->rx_status = CEC_RX_STATUS_OK;
1067 msg->sequence = msg->reply = msg->timeout = 0;
1070 msg->tx_arb_lost_cnt = 0;
1071 msg->tx_nack_cnt = 0;
1072 msg->tx_low_drive_cnt = 0;
1073 msg->tx_error_cnt = 0;
1075 memset(msg->msg + msg->len, 0, sizeof(msg->msg) - msg->len);
1077 mutex_lock(&adap->lock);
1078 dprintk(2, "%s: %*ph\n", __func__, msg->len, msg->msg);
1080 adap->last_initiator = 0xff;
1082 /* Check if this message was for us (directed or broadcast). */
1083 if (!cec_msg_is_broadcast(msg))
1084 valid_la = cec_has_log_addr(adap, msg_dest);
1087 * Check if the length is not too short or if the message is a
1088 * broadcast message where a directed message was expected or
1089 * vice versa. If so, then the message has to be ignored (according
1090 * to section CEC 7.3 and CEC 12.2).
1092 if (valid_la && msg->len > 1 && cec_msg_size[cmd]) {
1093 u8 dir_fl = cec_msg_size[cmd] & BOTH;
1095 min_len = cec_msg_size[cmd] & 0x1f;
1096 if (msg->len < min_len)
1098 else if (!cec_msg_is_broadcast(msg) && !(dir_fl & DIRECTED))
1100 else if (cec_msg_is_broadcast(msg) && !(dir_fl & BCAST))
1102 else if (cec_msg_is_broadcast(msg) &&
1103 adap->log_addrs.cec_version < CEC_OP_CEC_VERSION_2_0 &&
1104 !(dir_fl & BCAST1_4))
1107 if (valid_la && min_len) {
1108 /* These messages have special length requirements */
1110 case CEC_MSG_TIMER_STATUS:
1111 if (msg->msg[2] & 0x10) {
1112 switch (msg->msg[2] & 0xf) {
1113 case CEC_OP_PROG_INFO_NOT_ENOUGH_SPACE:
1114 case CEC_OP_PROG_INFO_MIGHT_NOT_BE_ENOUGH_SPACE:
1119 } else if ((msg->msg[2] & 0xf) == CEC_OP_PROG_ERROR_DUPLICATE) {
1124 case CEC_MSG_RECORD_ON:
1125 switch (msg->msg[2]) {
1126 case CEC_OP_RECORD_SRC_OWN:
1128 case CEC_OP_RECORD_SRC_DIGITAL:
1132 case CEC_OP_RECORD_SRC_ANALOG:
1136 case CEC_OP_RECORD_SRC_EXT_PLUG:
1140 case CEC_OP_RECORD_SRC_EXT_PHYS_ADDR:
1149 /* It's a valid message and not a poll or CDC message */
1150 if (valid_la && msg->len > 1 && cmd != CEC_MSG_CDC_MESSAGE) {
1151 bool abort = cmd == CEC_MSG_FEATURE_ABORT;
1153 /* The aborted command is in msg[2] */
1158 * Walk over all transmitted messages that are waiting for a
1161 list_for_each_entry(data, &adap->wait_queue, list) {
1162 struct cec_msg *dst = &data->msg;
1165 * The *only* CEC message that has two possible replies
1166 * is CEC_MSG_INITIATE_ARC.
1167 * In this case allow either of the two replies.
1169 if (!abort && dst->msg[1] == CEC_MSG_INITIATE_ARC &&
1170 (cmd == CEC_MSG_REPORT_ARC_INITIATED ||
1171 cmd == CEC_MSG_REPORT_ARC_TERMINATED) &&
1172 (dst->reply == CEC_MSG_REPORT_ARC_INITIATED ||
1173 dst->reply == CEC_MSG_REPORT_ARC_TERMINATED))
1176 /* Does the command match? */
1177 if ((abort && cmd != dst->msg[1]) ||
1178 (!abort && cmd != dst->reply))
1181 /* Does the addressing match? */
1182 if (msg_init != cec_msg_destination(dst) &&
1183 !cec_msg_is_broadcast(dst))
1186 /* We got a reply */
1187 memcpy(dst->msg, msg->msg, msg->len);
1188 dst->len = msg->len;
1189 dst->rx_ts = msg->rx_ts;
1190 dst->rx_status = msg->rx_status;
1192 dst->rx_status |= CEC_RX_STATUS_FEATURE_ABORT;
1193 msg->flags = dst->flags;
1194 /* Remove it from the wait_queue */
1195 list_del_init(&data->list);
1197 /* Cancel the pending timeout work */
1198 if (!cancel_delayed_work(&data->work)) {
1199 mutex_unlock(&adap->lock);
1200 flush_scheduled_work();
1201 mutex_lock(&adap->lock);
1204 * Mark this as a reply, provided someone is still
1205 * waiting for the answer.
1209 cec_data_completed(data);
1213 mutex_unlock(&adap->lock);
1215 /* Pass the message on to any monitoring filehandles */
1216 cec_queue_msg_monitor(adap, msg, valid_la);
1218 /* We're done if it is not for us or a poll message */
1219 if (!valid_la || msg->len <= 1)
1222 if (adap->log_addrs.log_addr_mask == 0)
1226 * Process the message on the protocol level. If is_reply is true,
1227 * then cec_receive_notify() won't pass on the reply to the listener(s)
1228 * since that was already done by cec_data_completed() above.
1230 cec_receive_notify(adap, msg, is_reply);
1232 EXPORT_SYMBOL_GPL(cec_received_msg_ts);
1234 /* Logical Address Handling */
1237 * Attempt to claim a specific logical address.
1239 * This function is called with adap->lock held.
1241 static int cec_config_log_addr(struct cec_adapter *adap,
1243 unsigned int log_addr)
1245 struct cec_log_addrs *las = &adap->log_addrs;
1246 struct cec_msg msg = { };
1247 const unsigned int max_retries = 2;
1251 if (cec_has_log_addr(adap, log_addr))
1254 /* Send poll message */
1256 msg.msg[0] = (log_addr << 4) | log_addr;
1258 for (i = 0; i < max_retries; i++) {
1259 err = cec_transmit_msg_fh(adap, &msg, NULL, true);
1262 * While trying to poll the physical address was reset
1263 * and the adapter was unconfigured, so bail out.
1265 if (!adap->is_configuring)
1272 * The message was aborted due to a disconnect or
1273 * unconfigure, just bail out.
1275 if (msg.tx_status & CEC_TX_STATUS_ABORTED)
1277 if (msg.tx_status & CEC_TX_STATUS_OK)
1279 if (msg.tx_status & CEC_TX_STATUS_NACK)
1282 * Retry up to max_retries times if the message was neither
1283 * OKed or NACKed. This can happen due to e.g. a Lost
1284 * Arbitration condition.
1289 * If we are unable to get an OK or a NACK after max_retries attempts
1290 * (and note that each attempt already consists of four polls), then
1291 * then we assume that something is really weird and that it is not a
1292 * good idea to try and claim this logical address.
1294 if (i == max_retries)
1298 * Message not acknowledged, so this logical
1299 * address is free to use.
1301 err = adap->ops->adap_log_addr(adap, log_addr);
1305 las->log_addr[idx] = log_addr;
1306 las->log_addr_mask |= 1 << log_addr;
1307 adap->phys_addrs[log_addr] = adap->phys_addr;
1312 * Unconfigure the adapter: clear all logical addresses and send
1313 * the state changed event.
1315 * This function is called with adap->lock held.
1317 static void cec_adap_unconfigure(struct cec_adapter *adap)
1319 if (!adap->needs_hpd ||
1320 adap->phys_addr != CEC_PHYS_ADDR_INVALID)
1321 WARN_ON(adap->ops->adap_log_addr(adap, CEC_LOG_ADDR_INVALID));
1322 adap->log_addrs.log_addr_mask = 0;
1323 adap->is_configuring = false;
1324 adap->is_configured = false;
1325 memset(adap->phys_addrs, 0xff, sizeof(adap->phys_addrs));
1327 wake_up_interruptible(&adap->kthread_waitq);
1328 cec_post_state_event(adap);
1332 * Attempt to claim the required logical addresses.
1334 static int cec_config_thread_func(void *arg)
1336 /* The various LAs for each type of device */
1337 static const u8 tv_log_addrs[] = {
1338 CEC_LOG_ADDR_TV, CEC_LOG_ADDR_SPECIFIC,
1339 CEC_LOG_ADDR_INVALID
1341 static const u8 record_log_addrs[] = {
1342 CEC_LOG_ADDR_RECORD_1, CEC_LOG_ADDR_RECORD_2,
1343 CEC_LOG_ADDR_RECORD_3,
1344 CEC_LOG_ADDR_BACKUP_1, CEC_LOG_ADDR_BACKUP_2,
1345 CEC_LOG_ADDR_INVALID
1347 static const u8 tuner_log_addrs[] = {
1348 CEC_LOG_ADDR_TUNER_1, CEC_LOG_ADDR_TUNER_2,
1349 CEC_LOG_ADDR_TUNER_3, CEC_LOG_ADDR_TUNER_4,
1350 CEC_LOG_ADDR_BACKUP_1, CEC_LOG_ADDR_BACKUP_2,
1351 CEC_LOG_ADDR_INVALID
1353 static const u8 playback_log_addrs[] = {
1354 CEC_LOG_ADDR_PLAYBACK_1, CEC_LOG_ADDR_PLAYBACK_2,
1355 CEC_LOG_ADDR_PLAYBACK_3,
1356 CEC_LOG_ADDR_BACKUP_1, CEC_LOG_ADDR_BACKUP_2,
1357 CEC_LOG_ADDR_INVALID
1359 static const u8 audiosystem_log_addrs[] = {
1360 CEC_LOG_ADDR_AUDIOSYSTEM,
1361 CEC_LOG_ADDR_INVALID
1363 static const u8 specific_use_log_addrs[] = {
1364 CEC_LOG_ADDR_SPECIFIC,
1365 CEC_LOG_ADDR_BACKUP_1, CEC_LOG_ADDR_BACKUP_2,
1366 CEC_LOG_ADDR_INVALID
1368 static const u8 *type2addrs[6] = {
1369 [CEC_LOG_ADDR_TYPE_TV] = tv_log_addrs,
1370 [CEC_LOG_ADDR_TYPE_RECORD] = record_log_addrs,
1371 [CEC_LOG_ADDR_TYPE_TUNER] = tuner_log_addrs,
1372 [CEC_LOG_ADDR_TYPE_PLAYBACK] = playback_log_addrs,
1373 [CEC_LOG_ADDR_TYPE_AUDIOSYSTEM] = audiosystem_log_addrs,
1374 [CEC_LOG_ADDR_TYPE_SPECIFIC] = specific_use_log_addrs,
1376 static const u16 type2mask[] = {
1377 [CEC_LOG_ADDR_TYPE_TV] = CEC_LOG_ADDR_MASK_TV,
1378 [CEC_LOG_ADDR_TYPE_RECORD] = CEC_LOG_ADDR_MASK_RECORD,
1379 [CEC_LOG_ADDR_TYPE_TUNER] = CEC_LOG_ADDR_MASK_TUNER,
1380 [CEC_LOG_ADDR_TYPE_PLAYBACK] = CEC_LOG_ADDR_MASK_PLAYBACK,
1381 [CEC_LOG_ADDR_TYPE_AUDIOSYSTEM] = CEC_LOG_ADDR_MASK_AUDIOSYSTEM,
1382 [CEC_LOG_ADDR_TYPE_SPECIFIC] = CEC_LOG_ADDR_MASK_SPECIFIC,
1384 struct cec_adapter *adap = arg;
1385 struct cec_log_addrs *las = &adap->log_addrs;
1389 mutex_lock(&adap->lock);
1390 dprintk(1, "physical address: %x.%x.%x.%x, claim %d logical addresses\n",
1391 cec_phys_addr_exp(adap->phys_addr), las->num_log_addrs);
1392 las->log_addr_mask = 0;
1394 if (las->log_addr_type[0] == CEC_LOG_ADDR_TYPE_UNREGISTERED)
1397 for (i = 0; i < las->num_log_addrs; i++) {
1398 unsigned int type = las->log_addr_type[i];
1403 * The TV functionality can only map to physical address 0.
1404 * For any other address, try the Specific functionality
1405 * instead as per the spec.
1407 if (adap->phys_addr && type == CEC_LOG_ADDR_TYPE_TV)
1408 type = CEC_LOG_ADDR_TYPE_SPECIFIC;
1410 la_list = type2addrs[type];
1411 last_la = las->log_addr[i];
1412 las->log_addr[i] = CEC_LOG_ADDR_INVALID;
1413 if (last_la == CEC_LOG_ADDR_INVALID ||
1414 last_la == CEC_LOG_ADDR_UNREGISTERED ||
1415 !((1 << last_la) & type2mask[type]))
1416 last_la = la_list[0];
1418 err = cec_config_log_addr(adap, i, last_la);
1419 if (err > 0) /* Reused last LA */
1425 for (j = 0; la_list[j] != CEC_LOG_ADDR_INVALID; j++) {
1426 /* Tried this one already, skip it */
1427 if (la_list[j] == last_la)
1429 /* The backup addresses are CEC 2.0 specific */
1430 if ((la_list[j] == CEC_LOG_ADDR_BACKUP_1 ||
1431 la_list[j] == CEC_LOG_ADDR_BACKUP_2) &&
1432 las->cec_version < CEC_OP_CEC_VERSION_2_0)
1435 err = cec_config_log_addr(adap, i, la_list[j]);
1436 if (err == 0) /* LA is in use */
1440 /* Done, claimed an LA */
1444 if (la_list[j] == CEC_LOG_ADDR_INVALID)
1445 dprintk(1, "could not claim LA %d\n", i);
1448 if (adap->log_addrs.log_addr_mask == 0 &&
1449 !(las->flags & CEC_LOG_ADDRS_FL_ALLOW_UNREG_FALLBACK))
1453 if (adap->log_addrs.log_addr_mask == 0) {
1454 /* Fall back to unregistered */
1455 las->log_addr[0] = CEC_LOG_ADDR_UNREGISTERED;
1456 las->log_addr_mask = 1 << las->log_addr[0];
1457 for (i = 1; i < las->num_log_addrs; i++)
1458 las->log_addr[i] = CEC_LOG_ADDR_INVALID;
1460 for (i = las->num_log_addrs; i < CEC_MAX_LOG_ADDRS; i++)
1461 las->log_addr[i] = CEC_LOG_ADDR_INVALID;
1462 adap->is_configured = true;
1463 adap->is_configuring = false;
1464 cec_post_state_event(adap);
1467 * Now post the Report Features and Report Physical Address broadcast
1468 * messages. Note that these are non-blocking transmits, meaning that
1469 * they are just queued up and once adap->lock is unlocked the main
1470 * thread will kick in and start transmitting these.
1472 * If after this function is done (but before one or more of these
1473 * messages are actually transmitted) the CEC adapter is unconfigured,
1474 * then any remaining messages will be dropped by the main thread.
1476 for (i = 0; i < las->num_log_addrs; i++) {
1477 struct cec_msg msg = {};
1479 if (las->log_addr[i] == CEC_LOG_ADDR_INVALID ||
1480 (las->flags & CEC_LOG_ADDRS_FL_CDC_ONLY))
1483 msg.msg[0] = (las->log_addr[i] << 4) | 0x0f;
1485 /* Report Features must come first according to CEC 2.0 */
1486 if (las->log_addr[i] != CEC_LOG_ADDR_UNREGISTERED &&
1487 adap->log_addrs.cec_version >= CEC_OP_CEC_VERSION_2_0) {
1488 cec_fill_msg_report_features(adap, &msg, i);
1489 cec_transmit_msg_fh(adap, &msg, NULL, false);
1492 /* Report Physical Address */
1493 cec_msg_report_physical_addr(&msg, adap->phys_addr,
1494 las->primary_device_type[i]);
1495 dprintk(1, "config: la %d pa %x.%x.%x.%x\n",
1497 cec_phys_addr_exp(adap->phys_addr));
1498 cec_transmit_msg_fh(adap, &msg, NULL, false);
1500 /* Report Vendor ID */
1501 if (adap->log_addrs.vendor_id != CEC_VENDOR_ID_NONE) {
1502 cec_msg_device_vendor_id(&msg,
1503 adap->log_addrs.vendor_id);
1504 cec_transmit_msg_fh(adap, &msg, NULL, false);
1507 adap->kthread_config = NULL;
1508 complete(&adap->config_completion);
1509 mutex_unlock(&adap->lock);
1513 for (i = 0; i < las->num_log_addrs; i++)
1514 las->log_addr[i] = CEC_LOG_ADDR_INVALID;
1515 cec_adap_unconfigure(adap);
1516 adap->kthread_config = NULL;
1517 mutex_unlock(&adap->lock);
1518 complete(&adap->config_completion);
1523 * Called from either __cec_s_phys_addr or __cec_s_log_addrs to claim the
1524 * logical addresses.
1526 * This function is called with adap->lock held.
1528 static void cec_claim_log_addrs(struct cec_adapter *adap, bool block)
1530 if (WARN_ON(adap->is_configuring || adap->is_configured))
1533 init_completion(&adap->config_completion);
1535 /* Ready to kick off the thread */
1536 adap->is_configuring = true;
1537 adap->kthread_config = kthread_run(cec_config_thread_func, adap,
1538 "ceccfg-%s", adap->name);
1539 if (IS_ERR(adap->kthread_config)) {
1540 adap->kthread_config = NULL;
1542 mutex_unlock(&adap->lock);
1543 wait_for_completion(&adap->config_completion);
1544 mutex_lock(&adap->lock);
1548 /* Set a new physical address and send an event notifying userspace of this.
1550 * This function is called with adap->lock held.
1552 void __cec_s_phys_addr(struct cec_adapter *adap, u16 phys_addr, bool block)
1554 if (phys_addr == adap->phys_addr)
1556 if (phys_addr != CEC_PHYS_ADDR_INVALID && adap->devnode.unregistered)
1559 dprintk(1, "new physical address %x.%x.%x.%x\n",
1560 cec_phys_addr_exp(phys_addr));
1561 if (phys_addr == CEC_PHYS_ADDR_INVALID ||
1562 adap->phys_addr != CEC_PHYS_ADDR_INVALID) {
1563 adap->phys_addr = CEC_PHYS_ADDR_INVALID;
1564 cec_post_state_event(adap);
1565 cec_adap_unconfigure(adap);
1566 /* Disabling monitor all mode should always succeed */
1567 if (adap->monitor_all_cnt)
1568 WARN_ON(call_op(adap, adap_monitor_all_enable, false));
1569 mutex_lock(&adap->devnode.lock);
1570 if (adap->needs_hpd || list_empty(&adap->devnode.fhs)) {
1571 WARN_ON(adap->ops->adap_enable(adap, false));
1572 adap->transmit_in_progress = false;
1573 wake_up_interruptible(&adap->kthread_waitq);
1575 mutex_unlock(&adap->devnode.lock);
1576 if (phys_addr == CEC_PHYS_ADDR_INVALID)
1580 mutex_lock(&adap->devnode.lock);
1581 adap->last_initiator = 0xff;
1582 adap->transmit_in_progress = false;
1584 if ((adap->needs_hpd || list_empty(&adap->devnode.fhs)) &&
1585 adap->ops->adap_enable(adap, true)) {
1586 mutex_unlock(&adap->devnode.lock);
1590 if (adap->monitor_all_cnt &&
1591 call_op(adap, adap_monitor_all_enable, true)) {
1592 if (adap->needs_hpd || list_empty(&adap->devnode.fhs))
1593 WARN_ON(adap->ops->adap_enable(adap, false));
1594 mutex_unlock(&adap->devnode.lock);
1597 mutex_unlock(&adap->devnode.lock);
1599 adap->phys_addr = phys_addr;
1600 cec_post_state_event(adap);
1601 if (adap->log_addrs.num_log_addrs)
1602 cec_claim_log_addrs(adap, block);
1605 void cec_s_phys_addr(struct cec_adapter *adap, u16 phys_addr, bool block)
1607 if (IS_ERR_OR_NULL(adap))
1610 mutex_lock(&adap->lock);
1611 __cec_s_phys_addr(adap, phys_addr, block);
1612 mutex_unlock(&adap->lock);
1614 EXPORT_SYMBOL_GPL(cec_s_phys_addr);
1616 void cec_s_phys_addr_from_edid(struct cec_adapter *adap,
1617 const struct edid *edid)
1619 u16 pa = CEC_PHYS_ADDR_INVALID;
1621 if (edid && edid->extensions)
1622 pa = cec_get_edid_phys_addr((const u8 *)edid,
1623 EDID_LENGTH * (edid->extensions + 1), NULL);
1624 cec_s_phys_addr(adap, pa, false);
1626 EXPORT_SYMBOL_GPL(cec_s_phys_addr_from_edid);
1628 void cec_s_conn_info(struct cec_adapter *adap,
1629 const struct cec_connector_info *conn_info)
1631 if (IS_ERR_OR_NULL(adap))
1634 if (!(adap->capabilities & CEC_CAP_CONNECTOR_INFO))
1637 mutex_lock(&adap->lock);
1639 adap->conn_info = *conn_info;
1641 memset(&adap->conn_info, 0, sizeof(adap->conn_info));
1642 cec_post_state_event(adap);
1643 mutex_unlock(&adap->lock);
1645 EXPORT_SYMBOL_GPL(cec_s_conn_info);
1648 * Called from either the ioctl or a driver to set the logical addresses.
1650 * This function is called with adap->lock held.
1652 int __cec_s_log_addrs(struct cec_adapter *adap,
1653 struct cec_log_addrs *log_addrs, bool block)
1658 if (adap->devnode.unregistered)
1661 if (!log_addrs || log_addrs->num_log_addrs == 0) {
1662 cec_adap_unconfigure(adap);
1663 adap->log_addrs.num_log_addrs = 0;
1664 for (i = 0; i < CEC_MAX_LOG_ADDRS; i++)
1665 adap->log_addrs.log_addr[i] = CEC_LOG_ADDR_INVALID;
1666 adap->log_addrs.osd_name[0] = '\0';
1667 adap->log_addrs.vendor_id = CEC_VENDOR_ID_NONE;
1668 adap->log_addrs.cec_version = CEC_OP_CEC_VERSION_2_0;
1672 if (log_addrs->flags & CEC_LOG_ADDRS_FL_CDC_ONLY) {
1674 * Sanitize log_addrs fields if a CDC-Only device is
1677 log_addrs->num_log_addrs = 1;
1678 log_addrs->osd_name[0] = '\0';
1679 log_addrs->vendor_id = CEC_VENDOR_ID_NONE;
1680 log_addrs->log_addr_type[0] = CEC_LOG_ADDR_TYPE_UNREGISTERED;
1682 * This is just an internal convention since a CDC-Only device
1683 * doesn't have to be a switch. But switches already use
1684 * unregistered, so it makes some kind of sense to pick this
1685 * as the primary device. Since a CDC-Only device never sends
1686 * any 'normal' CEC messages this primary device type is never
1687 * sent over the CEC bus.
1689 log_addrs->primary_device_type[0] = CEC_OP_PRIM_DEVTYPE_SWITCH;
1690 log_addrs->all_device_types[0] = 0;
1691 log_addrs->features[0][0] = 0;
1692 log_addrs->features[0][1] = 0;
1695 /* Ensure the osd name is 0-terminated */
1696 log_addrs->osd_name[sizeof(log_addrs->osd_name) - 1] = '\0';
1699 if (log_addrs->num_log_addrs > adap->available_log_addrs) {
1700 dprintk(1, "num_log_addrs > %d\n", adap->available_log_addrs);
1705 * Vendor ID is a 24 bit number, so check if the value is
1706 * within the correct range.
1708 if (log_addrs->vendor_id != CEC_VENDOR_ID_NONE &&
1709 (log_addrs->vendor_id & 0xff000000) != 0) {
1710 dprintk(1, "invalid vendor ID\n");
1714 if (log_addrs->cec_version != CEC_OP_CEC_VERSION_1_4 &&
1715 log_addrs->cec_version != CEC_OP_CEC_VERSION_2_0) {
1716 dprintk(1, "invalid CEC version\n");
1720 if (log_addrs->num_log_addrs > 1)
1721 for (i = 0; i < log_addrs->num_log_addrs; i++)
1722 if (log_addrs->log_addr_type[i] ==
1723 CEC_LOG_ADDR_TYPE_UNREGISTERED) {
1724 dprintk(1, "num_log_addrs > 1 can't be combined with unregistered LA\n");
1728 for (i = 0; i < log_addrs->num_log_addrs; i++) {
1729 const u8 feature_sz = ARRAY_SIZE(log_addrs->features[0]);
1730 u8 *features = log_addrs->features[i];
1731 bool op_is_dev_features = false;
1734 log_addrs->log_addr[i] = CEC_LOG_ADDR_INVALID;
1735 if (type_mask & (1 << log_addrs->log_addr_type[i])) {
1736 dprintk(1, "duplicate logical address type\n");
1739 type_mask |= 1 << log_addrs->log_addr_type[i];
1740 if ((type_mask & (1 << CEC_LOG_ADDR_TYPE_RECORD)) &&
1741 (type_mask & (1 << CEC_LOG_ADDR_TYPE_PLAYBACK))) {
1742 /* Record already contains the playback functionality */
1743 dprintk(1, "invalid record + playback combination\n");
1746 if (log_addrs->primary_device_type[i] >
1747 CEC_OP_PRIM_DEVTYPE_PROCESSOR) {
1748 dprintk(1, "unknown primary device type\n");
1751 if (log_addrs->primary_device_type[i] == 2) {
1752 dprintk(1, "invalid primary device type\n");
1755 if (log_addrs->log_addr_type[i] > CEC_LOG_ADDR_TYPE_UNREGISTERED) {
1756 dprintk(1, "unknown logical address type\n");
1759 for (j = 0; j < feature_sz; j++) {
1760 if ((features[j] & 0x80) == 0) {
1761 if (op_is_dev_features)
1763 op_is_dev_features = true;
1766 if (!op_is_dev_features || j == feature_sz) {
1767 dprintk(1, "malformed features\n");
1770 /* Zero unused part of the feature array */
1771 memset(features + j + 1, 0, feature_sz - j - 1);
1774 if (log_addrs->cec_version >= CEC_OP_CEC_VERSION_2_0) {
1775 if (log_addrs->num_log_addrs > 2) {
1776 dprintk(1, "CEC 2.0 allows no more than 2 logical addresses\n");
1779 if (log_addrs->num_log_addrs == 2) {
1780 if (!(type_mask & ((1 << CEC_LOG_ADDR_TYPE_AUDIOSYSTEM) |
1781 (1 << CEC_LOG_ADDR_TYPE_TV)))) {
1782 dprintk(1, "two LAs is only allowed for audiosystem and TV\n");
1785 if (!(type_mask & ((1 << CEC_LOG_ADDR_TYPE_PLAYBACK) |
1786 (1 << CEC_LOG_ADDR_TYPE_RECORD)))) {
1787 dprintk(1, "an audiosystem/TV can only be combined with record or playback\n");
1793 /* Zero unused LAs */
1794 for (i = log_addrs->num_log_addrs; i < CEC_MAX_LOG_ADDRS; i++) {
1795 log_addrs->primary_device_type[i] = 0;
1796 log_addrs->log_addr_type[i] = 0;
1797 log_addrs->all_device_types[i] = 0;
1798 memset(log_addrs->features[i], 0,
1799 sizeof(log_addrs->features[i]));
1802 log_addrs->log_addr_mask = adap->log_addrs.log_addr_mask;
1803 adap->log_addrs = *log_addrs;
1804 if (adap->phys_addr != CEC_PHYS_ADDR_INVALID)
1805 cec_claim_log_addrs(adap, block);
1809 int cec_s_log_addrs(struct cec_adapter *adap,
1810 struct cec_log_addrs *log_addrs, bool block)
1814 mutex_lock(&adap->lock);
1815 err = __cec_s_log_addrs(adap, log_addrs, block);
1816 mutex_unlock(&adap->lock);
1819 EXPORT_SYMBOL_GPL(cec_s_log_addrs);
1821 /* High-level core CEC message handling */
1823 /* Fill in the Report Features message */
1824 static void cec_fill_msg_report_features(struct cec_adapter *adap,
1825 struct cec_msg *msg,
1826 unsigned int la_idx)
1828 const struct cec_log_addrs *las = &adap->log_addrs;
1829 const u8 *features = las->features[la_idx];
1830 bool op_is_dev_features = false;
1833 /* Report Features */
1834 msg->msg[0] = (las->log_addr[la_idx] << 4) | 0x0f;
1836 msg->msg[1] = CEC_MSG_REPORT_FEATURES;
1837 msg->msg[2] = adap->log_addrs.cec_version;
1838 msg->msg[3] = las->all_device_types[la_idx];
1840 /* Write RC Profiles first, then Device Features */
1841 for (idx = 0; idx < ARRAY_SIZE(las->features[0]); idx++) {
1842 msg->msg[msg->len++] = features[idx];
1843 if ((features[idx] & CEC_OP_FEAT_EXT) == 0) {
1844 if (op_is_dev_features)
1846 op_is_dev_features = true;
1851 /* Transmit the Feature Abort message */
1852 static int cec_feature_abort_reason(struct cec_adapter *adap,
1853 struct cec_msg *msg, u8 reason)
1855 struct cec_msg tx_msg = { };
1858 * Don't reply with CEC_MSG_FEATURE_ABORT to a CEC_MSG_FEATURE_ABORT
1861 if (msg->msg[1] == CEC_MSG_FEATURE_ABORT)
1863 /* Don't Feature Abort messages from 'Unregistered' */
1864 if (cec_msg_initiator(msg) == CEC_LOG_ADDR_UNREGISTERED)
1866 cec_msg_set_reply_to(&tx_msg, msg);
1867 cec_msg_feature_abort(&tx_msg, msg->msg[1], reason);
1868 return cec_transmit_msg(adap, &tx_msg, false);
1871 static int cec_feature_abort(struct cec_adapter *adap, struct cec_msg *msg)
1873 return cec_feature_abort_reason(adap, msg,
1874 CEC_OP_ABORT_UNRECOGNIZED_OP);
1877 static int cec_feature_refused(struct cec_adapter *adap, struct cec_msg *msg)
1879 return cec_feature_abort_reason(adap, msg,
1880 CEC_OP_ABORT_REFUSED);
1884 * Called when a CEC message is received. This function will do any
1885 * necessary core processing. The is_reply bool is true if this message
1886 * is a reply to an earlier transmit.
1888 * The message is either a broadcast message or a valid directed message.
1890 static int cec_receive_notify(struct cec_adapter *adap, struct cec_msg *msg,
1893 bool is_broadcast = cec_msg_is_broadcast(msg);
1894 u8 dest_laddr = cec_msg_destination(msg);
1895 u8 init_laddr = cec_msg_initiator(msg);
1896 u8 devtype = cec_log_addr2dev(adap, dest_laddr);
1897 int la_idx = cec_log_addr2idx(adap, dest_laddr);
1898 bool from_unregistered = init_laddr == 0xf;
1899 struct cec_msg tx_cec_msg = { };
1901 dprintk(2, "%s: %*ph\n", __func__, msg->len, msg->msg);
1903 /* If this is a CDC-Only device, then ignore any non-CDC messages */
1904 if (cec_is_cdc_only(&adap->log_addrs) &&
1905 msg->msg[1] != CEC_MSG_CDC_MESSAGE)
1908 if (adap->ops->received) {
1909 /* Allow drivers to process the message first */
1910 if (adap->ops->received(adap, msg) != -ENOMSG)
1915 * REPORT_PHYSICAL_ADDR, CEC_MSG_USER_CONTROL_PRESSED and
1916 * CEC_MSG_USER_CONTROL_RELEASED messages always have to be
1917 * handled by the CEC core, even if the passthrough mode is on.
1918 * The others are just ignored if passthrough mode is on.
1920 switch (msg->msg[1]) {
1921 case CEC_MSG_GET_CEC_VERSION:
1923 case CEC_MSG_GIVE_DEVICE_POWER_STATUS:
1924 case CEC_MSG_GIVE_OSD_NAME:
1926 * These messages reply with a directed message, so ignore if
1927 * the initiator is Unregistered.
1929 if (!adap->passthrough && from_unregistered)
1932 case CEC_MSG_GIVE_DEVICE_VENDOR_ID:
1933 case CEC_MSG_GIVE_FEATURES:
1934 case CEC_MSG_GIVE_PHYSICAL_ADDR:
1936 * Skip processing these messages if the passthrough mode
1939 if (adap->passthrough)
1940 goto skip_processing;
1941 /* Ignore if addressing is wrong */
1946 case CEC_MSG_USER_CONTROL_PRESSED:
1947 case CEC_MSG_USER_CONTROL_RELEASED:
1948 /* Wrong addressing mode: don't process */
1949 if (is_broadcast || from_unregistered)
1950 goto skip_processing;
1953 case CEC_MSG_REPORT_PHYSICAL_ADDR:
1955 * This message is always processed, regardless of the
1956 * passthrough setting.
1958 * Exception: don't process if wrong addressing mode.
1961 goto skip_processing;
1968 cec_msg_set_reply_to(&tx_cec_msg, msg);
1970 switch (msg->msg[1]) {
1971 /* The following messages are processed but still passed through */
1972 case CEC_MSG_REPORT_PHYSICAL_ADDR: {
1973 u16 pa = (msg->msg[2] << 8) | msg->msg[3];
1975 if (!from_unregistered)
1976 adap->phys_addrs[init_laddr] = pa;
1977 dprintk(1, "reported physical address %x.%x.%x.%x for logical address %d\n",
1978 cec_phys_addr_exp(pa), init_laddr);
1982 case CEC_MSG_USER_CONTROL_PRESSED:
1983 if (!(adap->capabilities & CEC_CAP_RC) ||
1984 !(adap->log_addrs.flags & CEC_LOG_ADDRS_FL_ALLOW_RC_PASSTHRU))
1987 #ifdef CONFIG_MEDIA_CEC_RC
1988 switch (msg->msg[2]) {
1990 * Play function, this message can have variable length
1991 * depending on the specific play function that is used.
1995 rc_keydown(adap->rc, RC_PROTO_CEC,
1998 rc_keydown(adap->rc, RC_PROTO_CEC,
1999 msg->msg[2] << 8 | msg->msg[3], 0);
2002 * Other function messages that are not handled.
2003 * Currently the RC framework does not allow to supply an
2004 * additional parameter to a keypress. These "keys" contain
2005 * other information such as channel number, an input number
2007 * For the time being these messages are not processed by the
2008 * framework and are simply forwarded to the user space.
2010 case 0x56: case 0x57:
2011 case 0x67: case 0x68: case 0x69: case 0x6a:
2014 rc_keydown(adap->rc, RC_PROTO_CEC, msg->msg[2], 0);
2020 case CEC_MSG_USER_CONTROL_RELEASED:
2021 if (!(adap->capabilities & CEC_CAP_RC) ||
2022 !(adap->log_addrs.flags & CEC_LOG_ADDRS_FL_ALLOW_RC_PASSTHRU))
2024 #ifdef CONFIG_MEDIA_CEC_RC
2030 * The remaining messages are only processed if the passthrough mode
2033 case CEC_MSG_GET_CEC_VERSION:
2034 cec_msg_cec_version(&tx_cec_msg, adap->log_addrs.cec_version);
2035 return cec_transmit_msg(adap, &tx_cec_msg, false);
2037 case CEC_MSG_GIVE_PHYSICAL_ADDR:
2038 /* Do nothing for CEC switches using addr 15 */
2039 if (devtype == CEC_OP_PRIM_DEVTYPE_SWITCH && dest_laddr == 15)
2041 cec_msg_report_physical_addr(&tx_cec_msg, adap->phys_addr, devtype);
2042 return cec_transmit_msg(adap, &tx_cec_msg, false);
2044 case CEC_MSG_GIVE_DEVICE_VENDOR_ID:
2045 if (adap->log_addrs.vendor_id == CEC_VENDOR_ID_NONE)
2046 return cec_feature_abort(adap, msg);
2047 cec_msg_device_vendor_id(&tx_cec_msg, adap->log_addrs.vendor_id);
2048 return cec_transmit_msg(adap, &tx_cec_msg, false);
2051 /* Do nothing for CEC switches */
2052 if (devtype == CEC_OP_PRIM_DEVTYPE_SWITCH)
2054 return cec_feature_refused(adap, msg);
2056 case CEC_MSG_GIVE_OSD_NAME: {
2057 if (adap->log_addrs.osd_name[0] == 0)
2058 return cec_feature_abort(adap, msg);
2059 cec_msg_set_osd_name(&tx_cec_msg, adap->log_addrs.osd_name);
2060 return cec_transmit_msg(adap, &tx_cec_msg, false);
2063 case CEC_MSG_GIVE_FEATURES:
2064 if (adap->log_addrs.cec_version < CEC_OP_CEC_VERSION_2_0)
2065 return cec_feature_abort(adap, msg);
2066 cec_fill_msg_report_features(adap, &tx_cec_msg, la_idx);
2067 return cec_transmit_msg(adap, &tx_cec_msg, false);
2071 * Unprocessed messages are aborted if userspace isn't doing
2072 * any processing either.
2074 if (!is_broadcast && !is_reply && !adap->follower_cnt &&
2075 !adap->cec_follower && msg->msg[1] != CEC_MSG_FEATURE_ABORT)
2076 return cec_feature_abort(adap, msg);
2081 /* If this was a reply, then we're done, unless otherwise specified */
2082 if (is_reply && !(msg->flags & CEC_MSG_FL_REPLY_TO_FOLLOWERS))
2086 * Send to the exclusive follower if there is one, otherwise send
2089 if (adap->cec_follower)
2090 cec_queue_msg_fh(adap->cec_follower, msg);
2092 cec_queue_msg_followers(adap, msg);
2097 * Helper functions to keep track of the 'monitor all' use count.
2099 * These functions are called with adap->lock held.
2101 int cec_monitor_all_cnt_inc(struct cec_adapter *adap)
2105 if (adap->monitor_all_cnt == 0)
2106 ret = call_op(adap, adap_monitor_all_enable, 1);
2108 adap->monitor_all_cnt++;
2112 void cec_monitor_all_cnt_dec(struct cec_adapter *adap)
2114 adap->monitor_all_cnt--;
2115 if (adap->monitor_all_cnt == 0)
2116 WARN_ON(call_op(adap, adap_monitor_all_enable, 0));
2120 * Helper functions to keep track of the 'monitor pin' use count.
2122 * These functions are called with adap->lock held.
2124 int cec_monitor_pin_cnt_inc(struct cec_adapter *adap)
2128 if (adap->monitor_pin_cnt == 0)
2129 ret = call_op(adap, adap_monitor_pin_enable, 1);
2131 adap->monitor_pin_cnt++;
2135 void cec_monitor_pin_cnt_dec(struct cec_adapter *adap)
2137 adap->monitor_pin_cnt--;
2138 if (adap->monitor_pin_cnt == 0)
2139 WARN_ON(call_op(adap, adap_monitor_pin_enable, 0));
2142 #ifdef CONFIG_DEBUG_FS
2144 * Log the current state of the CEC adapter.
2145 * Very useful for debugging.
2147 int cec_adap_status(struct seq_file *file, void *priv)
2149 struct cec_adapter *adap = dev_get_drvdata(file->private);
2150 struct cec_data *data;
2152 mutex_lock(&adap->lock);
2153 seq_printf(file, "configured: %d\n", adap->is_configured);
2154 seq_printf(file, "configuring: %d\n", adap->is_configuring);
2155 seq_printf(file, "phys_addr: %x.%x.%x.%x\n",
2156 cec_phys_addr_exp(adap->phys_addr));
2157 seq_printf(file, "number of LAs: %d\n", adap->log_addrs.num_log_addrs);
2158 seq_printf(file, "LA mask: 0x%04x\n", adap->log_addrs.log_addr_mask);
2159 if (adap->cec_follower)
2160 seq_printf(file, "has CEC follower%s\n",
2161 adap->passthrough ? " (in passthrough mode)" : "");
2162 if (adap->cec_initiator)
2163 seq_puts(file, "has CEC initiator\n");
2164 if (adap->monitor_all_cnt)
2165 seq_printf(file, "file handles in Monitor All mode: %u\n",
2166 adap->monitor_all_cnt);
2167 if (adap->tx_timeouts) {
2168 seq_printf(file, "transmit timeouts: %u\n",
2170 adap->tx_timeouts = 0;
2172 data = adap->transmitting;
2174 seq_printf(file, "transmitting message: %*ph (reply: %02x, timeout: %ums)\n",
2175 data->msg.len, data->msg.msg, data->msg.reply,
2177 seq_printf(file, "pending transmits: %u\n", adap->transmit_queue_sz);
2178 list_for_each_entry(data, &adap->transmit_queue, list) {
2179 seq_printf(file, "queued tx message: %*ph (reply: %02x, timeout: %ums)\n",
2180 data->msg.len, data->msg.msg, data->msg.reply,
2183 list_for_each_entry(data, &adap->wait_queue, list) {
2184 seq_printf(file, "message waiting for reply: %*ph (reply: %02x, timeout: %ums)\n",
2185 data->msg.len, data->msg.msg, data->msg.reply,
2189 call_void_op(adap, adap_status, file);
2190 mutex_unlock(&adap->lock);