diff options
Diffstat (limited to 'drivers/staging/media')
| -rw-r--r-- | drivers/staging/media/cec/cec-adap.c | 1627 |
1 files changed, 1627 insertions, 0 deletions
diff --git a/drivers/staging/media/cec/cec-adap.c b/drivers/staging/media/cec/cec-adap.c new file mode 100644 index 000000000000..5ffa839e5dec --- /dev/null +++ b/drivers/staging/media/cec/cec-adap.c @@ -0,0 +1,1627 @@ +/* + * cec-adap.c - HDMI Consumer Electronics Control framework - CEC adapter + * + * Copyright 2016 Cisco Systems, Inc. and/or its affiliates. All rights reserved. + * + * This program is free software; you may redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; version 2 of the License. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, + * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND + * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS + * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN + * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN + * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE + * SOFTWARE. + */ + +#include <linux/errno.h> +#include <linux/init.h> +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/kmod.h> +#include <linux/ktime.h> +#include <linux/slab.h> +#include <linux/mm.h> +#include <linux/string.h> +#include <linux/types.h> + +#include "cec-priv.h" + +static int cec_report_features(struct cec_adapter *adap, unsigned int la_idx); +static int cec_report_phys_addr(struct cec_adapter *adap, unsigned int la_idx); + +/* + * 400 ms is the time it takes for one 16 byte message to be + * transferred and 5 is the maximum number of retries. Add + * another 100 ms as a margin. So if the transmit doesn't + * finish before that time something is really wrong and we + * have to time out. + * + * This is a sign that something it really wrong and a warning + * will be issued. + */ +#define CEC_XFER_TIMEOUT_MS (5 * 400 + 100) + +#define call_op(adap, op, arg...) \ + (adap->ops->op ? adap->ops->op(adap, ## arg) : 0) + +#define call_void_op(adap, op, arg...) \ + do { \ + if (adap->ops->op) \ + adap->ops->op(adap, ## arg); \ + } while (0) + +static int cec_log_addr2idx(const struct cec_adapter *adap, u8 log_addr) +{ + int i; + + for (i = 0; i < adap->log_addrs.num_log_addrs; i++) + if (adap->log_addrs.log_addr[i] == log_addr) + return i; + return -1; +} + +static unsigned int cec_log_addr2dev(const struct cec_adapter *adap, u8 log_addr) +{ + int i = cec_log_addr2idx(adap, log_addr); + + return adap->log_addrs.primary_device_type[i < 0 ? 0 : i]; +} + +/* + * Queue a new event for this filehandle. If ts == 0, then set it + * to the current time. + * + * The two events that are currently defined do not need to keep track + * of intermediate events, so no actual queue of events is needed, + * instead just store the latest state and the total number of lost + * messages. + * + * Should new events be added in the future that require intermediate + * results to be queued as well, then a proper queue data structure is + * required. But until then, just keep it simple. + */ +void cec_queue_event_fh(struct cec_fh *fh, + const struct cec_event *new_ev, u64 ts) +{ + struct cec_event *ev = &fh->events[new_ev->event - 1]; + + if (ts == 0) + ts = ktime_get_ns(); + + mutex_lock(&fh->lock); + if (new_ev->event == CEC_EVENT_LOST_MSGS && + fh->pending_events & (1 << new_ev->event)) { + /* + * If there is already a lost_msgs event, then just + * update the lost_msgs count. This effectively + * merges the old and new events into one. + */ + ev->lost_msgs.lost_msgs += new_ev->lost_msgs.lost_msgs; + goto unlock; + } + + /* + * Intermediate states are not interesting, so just + * overwrite any older event. + */ + *ev = *new_ev; + ev->ts = ts; + fh->pending_events |= 1 << new_ev->event; + +unlock: + mutex_unlock(&fh->lock); + wake_up_interruptible(&fh->wait); +} + +/* Queue a new event for all open filehandles. */ +static void cec_queue_event(struct cec_adapter *adap, + const struct cec_event *ev) +{ + u64 ts = ktime_get_ns(); + struct cec_fh *fh; + + mutex_lock(&adap->devnode.fhs_lock); + list_for_each_entry(fh, &adap->devnode.fhs, list) + cec_queue_event_fh(fh, ev, ts); + mutex_unlock(&adap->devnode.fhs_lock); +} + +/* + * Queue a new message for this filehandle. If there is no more room + * in the queue, then send the LOST_MSGS event instead. + */ +static void cec_queue_msg_fh(struct cec_fh *fh, const struct cec_msg *msg) +{ + static const struct cec_event ev_lost_msg = { + .event = CEC_EVENT_LOST_MSGS, + .lost_msgs.lost_msgs = 1, + }; + struct cec_msg_entry *entry; + + mutex_lock(&fh->lock); + entry = kmalloc(sizeof(*entry), GFP_KERNEL); + if (!entry) + goto lost_msgs; + + entry->msg = *msg; + /* Add new msg at the end of the queue */ + list_add_tail(&entry->list, &fh->msgs); + + /* + * if the queue now has more than CEC_MAX_MSG_QUEUE_SZ + * messages, drop the oldest one and send a lost message event. + */ + if (fh->queued_msgs == CEC_MAX_MSG_QUEUE_SZ) { + list_del(&entry->list); + goto lost_msgs; + } + fh->queued_msgs++; + mutex_unlock(&fh->lock); + wake_up_interruptible(&fh->wait); + return; + +lost_msgs: + mutex_unlock(&fh->lock); + cec_queue_event_fh(fh, &ev_lost_msg, 0); +} + +/* + * Queue the message for those filehandles that are in monitor mode. + * If valid_la is true (this message is for us or was sent by us), + * then pass it on to any monitoring filehandle. If this message + * isn't for us or from us, then only give it to filehandles that + * are in MONITOR_ALL mode. + * + * This can only happen if the CEC_CAP_MONITOR_ALL capability is + * set and the CEC adapter was placed in 'monitor all' mode. + */ +static void cec_queue_msg_monitor(struct cec_adapter *adap, + const struct cec_msg *msg, + bool valid_la) +{ + struct cec_fh *fh; + u32 monitor_mode = valid_la ? CEC_MODE_MONITOR : + CEC_MODE_MONITOR_ALL; + + mutex_lock(&adap->devnode.fhs_lock); + list_for_each_entry(fh, &adap->devnode.fhs, list) { + if (fh->mode_follower >= monitor_mode) + cec_queue_msg_fh(fh, msg); + } + mutex_unlock(&adap->devnode.fhs_lock); +} + +/* + * Queue the message for follower filehandles. + */ +static void cec_queue_msg_followers(struct cec_adapter *adap, + const struct cec_msg *msg) +{ + struct cec_fh *fh; + + mutex_lock(&adap->devnode.fhs_lock); + list_for_each_entry(fh, &adap->devnode.fhs, list) { + if (fh->mode_follower == CEC_MODE_FOLLOWER) + cec_queue_msg_fh(fh, msg); + } + mutex_unlock(&adap->devnode.fhs_lock); +} + +/* Notify userspace of an adapter state change. */ +static void cec_post_state_event(struct cec_adapter *adap) +{ + struct cec_event ev = { + .event = CEC_EVENT_STATE_CHANGE, + }; + + ev.state_change.phys_addr = adap->phys_addr; + ev.state_change.log_addr_mask = adap->log_addrs.log_addr_mask; + cec_queue_event(adap, &ev); +} + +/* + * A CEC transmit (and a possible wait for reply) completed. + * If this was in blocking mode, then complete it, otherwise + * queue the message for userspace to dequeue later. + * + * This function is called with adap->lock held. + */ +static void cec_data_completed(struct cec_data *data) +{ + /* + * Delete this transmit from the filehandle's xfer_list since + * we're done with it. + * + * Note that if the filehandle is closed before this transmit + * finished, then the release() function will set data->fh to NULL. + * Without that we would be referring to a closed filehandle. + */ + if (data->fh) + list_del(&data->xfer_list); + + if (data->blocking) { + /* + * Someone is blocking so mark the message as completed + * and call complete. + */ + data->completed = true; + complete(&data->c); + } else { + /* + * No blocking, so just queue the message if needed and + * free the memory. + */ + if (data->fh) + cec_queue_msg_fh(data->fh, &data->msg); + kfree(data); + } +} + +/* + * A pending CEC transmit needs to be cancelled, either because the CEC + * adapter is disabled or the transmit takes an impossibly long time to + * finish. + * + * This function is called with adap->lock held. + */ +static void cec_data_cancel(struct cec_data *data) +{ + /* + * It's either the current transmit, or it is a pending + * transmit. Take the appropriate action to clear it. + */ + if (data->adap->transmitting == data) + data->adap->transmitting = NULL; + else + list_del_init(&data->list); + + /* Mark it as an error */ + data->msg.ts = ktime_get_ns(); + data->msg.tx_status = CEC_TX_STATUS_ERROR | + CEC_TX_STATUS_MAX_RETRIES; + data->attempts = 0; + data->msg.tx_error_cnt = 1; + data->msg.reply = 0; + /* Queue transmitted message for monitoring purposes */ + cec_queue_msg_monitor(data->adap, &data->msg, 1); + + cec_data_completed(data); +} + +/* + * Main CEC state machine + * + * Wait until the thread should be stopped, or we are not transmitting and + * a new transmit message is queued up, in which case we start transmitting + * that message. When the adapter finished transmitting the message it will + * call cec_transmit_done(). + * + * If the adapter is disabled, then remove all queued messages instead. + * + * If the current transmit times out, then cancel that transmit. + */ +int cec_thread_func(void *_adap) +{ + struct cec_adapter *adap = _adap; + + for (;;) { + unsigned int signal_free_time; + struct cec_data *data; + bool timeout = false; + u8 attempts; + + if (adap->transmitting) { + int err; + + /* + * We are transmitting a message, so add a timeout + * to prevent the state machine to get stuck waiting + * for this message to finalize and add a check to + * see if the adapter is disabled in which case the + * transmit should be canceled. + */ + err = wait_event_interruptible_timeout(adap->kthread_waitq, + kthread_should_stop() || + adap->phys_addr == CEC_PHYS_ADDR_INVALID || + (!adap->transmitting && + !list_empty(&adap->transmit_queue)), + msecs_to_jiffies(CEC_XFER_TIMEOUT_MS)); + timeout = err == 0; + } else { + /* Otherwise we just wait for something to happen. */ + wait_event_interruptible(adap->kthread_waitq, + kthread_should_stop() || + (!adap->transmitting && + !list_empty(&adap->transmit_queue))); + } + + mutex_lock(&adap->lock); + + if (adap->phys_addr == CEC_PHYS_ADDR_INVALID || + kthread_should_stop()) { + /* + * If the adapter is disabled, or we're asked to stop, + * then cancel any pending transmits. + */ + while (!list_empty(&adap->transmit_queue)) { + data = list_first_entry(&adap->transmit_queue, + struct cec_data, list); + cec_data_cancel(data); + } + if (adap->transmitting) + cec_data_cancel(adap->transmitting); + + /* + * Cancel the pending timeout work. We have to unlock + * the mutex when flushing the work since + * cec_wait_timeout() will take it. This is OK since + * no new entries can be added to wait_queue as long + * as adap->transmitting is NULL, which it is due to + * the cec_data_cancel() above. + */ + while (!list_empty(&adap->wait_queue)) { + data = list_first_entry(&adap->wait_queue, + struct cec_data, list); + + if (!cancel_delayed_work(&data->work)) { + mutex_unlock(&adap->lock); + flush_scheduled_work(); + mutex_lock(&adap->lock); + } + cec_data_cancel(data); + } + goto unlock; + } + + if (adap->transmitting && timeout) { + /* + * If we timeout, then log that. This really shouldn't + * happen and is an indication of a faulty CEC adapter + * driver, or the CEC bus is in some weird state. + */ + dprintk(0, "message %*ph timed out!\n", + adap->transmitting->msg.len, + adap->transmitting->msg.msg); + /* Just give up on this. */ + cec_data_cancel(adap->transmitting); + goto unlock; + } + + /* + * If we are still transmitting, or there is nothing new to + * transmit, then just continue waiting. + */ + if (adap->transmitting || list_empty(&adap->transmit_queue)) + goto unlock; + + /* Get a new message to transmit */ + data = list_first_entry(&adap->transmit_queue, + struct cec_data, list); + list_del_init(&data->list); + /* Make this the current transmitting message */ + adap->transmitting = data; + + /* + * Suggested number of attempts as per the CEC 2.0 spec: + * 4 attempts is the default, except for 'secondary poll + * messages', i.e. poll messages not sent during the adapter + * configuration phase when it allocates logical addresses. + */ + if (data->msg.len == 1 && adap->is_configured) + attempts = 2; + else + attempts = 4; + + /* Set the suggested signal free time */ + if (data->attempts) { + /* should be >= 3 data bit periods for a retry */ + signal_free_time = CEC_SIGNAL_FREE_TIME_RETRY; + } else if (data->new_initiator) { + /* should be >= 5 data bit periods for new initiator */ + signal_free_time = CEC_SIGNAL_FREE_TIME_NEW_INITIATOR; + } else { + /* + * should be >= 7 data bit periods for sending another + * frame immediately after another. + */ + signal_free_time = CEC_SIGNAL_FREE_TIME_NEXT_XFER; + } + if (data->attempts == 0) + data->attempts = attempts; + + /* Tell the adapter to transmit, cancel on error */ + if (adap->ops->adap_transmit(adap, data->attempts, + signal_free_time, &data->msg)) + cec_data_cancel(data); + +unlock: + mutex_unlock(&adap->lock); + + if (kthread_should_stop()) + break; + } + return 0; +} + +/* + * Called by the CEC adapter if a transmit finished. + */ +void cec_transmit_done(struct cec_adapter *adap, u8 status, u8 arb_lost_cnt, + u8 nack_cnt, u8 low_drive_cnt, u8 error_cnt) +{ + struct cec_data *data; + struct cec_msg *msg; + + dprintk(2, "cec_transmit_done %02x\n", status); + mutex_lock(&adap->lock); + data = adap->transmitting; + if (!data) { + /* + * This can happen if a transmit was issued and the cable is + * unplugged while the transmit is ongoing. Ignore this + * transmit in that case. + */ + dprintk(1, "cec_transmit_done without an ongoing transmit!\n"); + goto unlock; + } + + msg = &data->msg; + + /* Drivers must fill in the status! */ + WARN_ON(status == 0); + msg->ts = ktime_get_ns(); + msg->tx_status |= status; + msg->tx_arb_lost_cnt += arb_lost_cnt; + msg->tx_nack_cnt += nack_cnt; + msg->tx_low_drive_cnt += low_drive_cnt; + msg->tx_error_cnt += error_cnt; + + /* Mark that we're done with this transmit */ + adap->transmitting = NULL; + + /* + * If there are still retry attempts left and there was an error and + * the hardware didn't signal that it retried itself (by setting + * CEC_TX_STATUS_MAX_RETRIES), then we will retry ourselves. + */ + if (data->attempts > 1 && + !(status & (CEC_TX_STATUS_MAX_RETRIES | CEC_TX_STATUS_OK))) { + /* Retry this message */ + data->attempts--; + /* Add the message in front of the transmit queue */ + list_add(&data->list, &adap->transmit_queue); + goto wake_thread; + } + + data->attempts = 0; + + /* Always set CEC_TX_STATUS_MAX_RETRIES on error */ + if (!(status & CEC_TX_STATUS_OK)) + msg->tx_status |= CEC_TX_STATUS_MAX_RETRIES; + + /* Queue transmitted message for monitoring purposes */ + cec_queue_msg_monitor(adap, msg, 1); + + /* + * Clear reply and timeout on error or if the adapter is no longer + * configured. It makes no sense to wait for a reply in that case. + */ + if (!(status & CEC_TX_STATUS_OK) || !adap->is_configured) { + msg->reply = 0; + msg->timeout = 0; + } + + if (msg->timeout) { + /* + * Queue the message into the wait queue if we want to wait + * for a reply. + */ + list_add_tail(&data->list, &adap->wait_queue); + schedule_delayed_work(&data->work, + msecs_to_jiffies(msg->timeout)); + } else { + /* Otherwise we're done */ + cec_data_completed(data); + } + +wake_thread: + /* + * Wake up the main thread to see if another message is ready + * for transmitting or to retry the current message. + */ + wake_up_interruptible(&adap->kthread_waitq); +unlock: + mutex_unlock(&adap->lock); +} +EXPORT_SYMBOL_GPL(cec_transmit_done); + +/* + * Called when waiting for a reply times out. + */ +static void cec_wait_timeout(struct work_struct *work) +{ + struct cec_data *data = container_of(work, struct cec_data, work.work); + struct cec_adapter *adap = data->adap; + + mutex_lock(&adap->lock); + /* + * Sanity check in case the timeout and the arrival of the message + * happened at the same time. + */ + if (list_empty(&data->list)) + goto unlock; + + /* Mark the message as timed out */ + list_del_init(&data->list); + data->msg.ts = ktime_get_ns(); + data->msg.rx_status = CEC_RX_STATUS_TIMEOUT; + cec_data_completed(data); +unlock: + mutex_unlock(&adap->lock); +} + +/* + * Transmit a message. The fh argument may be NULL if the transmit is not + * associated with a specific filehandle. + * + * This function is called with adap->lock held. + */ +int cec_transmit_msg_fh(struct cec_adapter *adap, struct cec_msg *msg, + struct cec_fh *fh, bool block) +{ + struct cec_data *data; + u8 last_initiator = 0xff; + unsigned int timeout; + int res = 0; + + if (msg->reply && msg->timeout == 0) { + /* Make sure the timeout isn't 0. */ + msg->timeout = 1000; + } + + /* Sanity checks */ + if (msg->len == 0 || msg->len > CEC_MAX_MSG_SIZE) { + dprintk(1, "cec_transmit_msg: invalid length %d\n", msg->len); + return -EINVAL; + } + if (msg->timeout && msg->len == 1) { + dprintk(1, "cec_transmit_msg: can't reply for poll msg\n"); + return -EINVAL; + } + if (msg->len == 1) { + if (cec_msg_initiator(msg) != 0xf || + cec_msg_destination(msg) == 0xf) { + dprintk(1, "cec_transmit_msg: invalid poll message\n"); + return -EINVAL; + } + if (cec_has_log_addr(adap, cec_msg_destination(msg))) { + /* + * If the destination is a logical address our adapter + * has already claimed, then just NACK this. + * It depends on the hardware what it will do with a + * POLL to itself (some OK this), so it is just as + * easy to handle it here so the behavior will be + * consistent. + */ + msg->tx_status = CEC_TX_STATUS_NACK | + CEC_TX_STATUS_MAX_RETRIES; + msg->tx_nack_cnt = 1; + return 0; + } + } + if (msg->len > 1 && !cec_msg_is_broadcast(msg) && + cec_has_log_addr(adap, cec_msg_destination(msg))) { + dprintk(1, "cec_transmit_msg: destination is the adapter itself\n"); + return -EINVAL; + } + if (cec_msg_initiator(msg) != 0xf && + !cec_has_log_addr(adap, cec_msg_initiator(msg))) { + dprintk(1, "cec_transmit_msg: initiator has unknown logical address %d\n", + cec_msg_initiator(msg)); + return -EINVAL; + } + if (!adap->is_configured && !adap->is_configuring) + return -ENONET; + + data = kzalloc(sizeof(*data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + if (msg->len > 1 && msg->msg[1] == CEC_MSG_CDC_MESSAGE) { + msg->msg[2] = adap->phys_addr >> 8; + msg->msg[3] = adap->phys_addr & 0xff; + } + + if (msg->timeout) + dprintk(2, "cec_transmit_msg: %*ph (wait for 0x%02x%s)\n", + msg->len, msg->msg, msg->reply, !block ? ", nb" : ""); + else + dprintk(2, "cec_transmit_msg: %*ph%s\n", + msg->len, msg->msg, !block ? " (nb)" : ""); + + msg->rx_status = 0; + msg->tx_status = 0; + msg->tx_arb_lost_cnt = 0; + msg->tx_nack_cnt = 0; + msg->tx_low_drive_cnt = 0; + msg->tx_error_cnt = 0; + data->msg = *msg; + data->fh = fh; + data->adap = adap; + data->blocking = block; + + /* + * Determine if this message follows a message from the same + * initiator. Needed to determine the free signal time later on. + */ + if (msg->len > 1) { + if (!(list_empty(&adap->transmit_queue))) { + const struct cec_data *last; + + last = list_last_entry(&adap->transmit_queue, + const struct cec_data, list); + last_initiator = cec_msg_initiator(&last->msg); + } else if (adap->transmitting) { + last_initiator = + cec_msg_initiator(&adap->transmitting->msg); + } + } + data->new_initiator = last_initiator != cec_msg_initiator(msg); + init_completion(&data->c); + INIT_DELAYED_WORK(&data->work, cec_wait_timeout); + + data->msg.sequence = adap->sequence++; + if (fh) + list_add_tail(&data->xfer_list, &fh->xfer_list); + list_add_tail(&data->list, &adap->transmit_queue); + if (!adap->transmitting) + wake_up_interruptible(&adap->kthread_waitq); + + /* All done if we don't need to block waiting for completion */ + if (!block) + return 0; + + /* + * If we don't get a completion before this time something is really + * wrong and we time out. + */ + timeout = CEC_XFER_TIMEOUT_MS; + /* Add the requested timeout if we have to wait for a reply as well */ + if (msg->timeout) + timeout += msg->timeout; + + /* + * Release the lock and wait, retake the lock afterwards. + */ + mutex_unlock(&adap->lock); + res = wait_for_completion_killable_timeout(&data->c, + msecs_to_jiffies(timeout)); + mutex_lock(&adap->lock); + + if (data->completed) { + /* The transmit completed (possibly with an error) */ + *msg = data->msg; + kfree(data); + return 0; + } + /* + * The wait for completion timed out or was interrupted, so mark this + * as non-blocking and disconnect from the filehandle since it is + * still 'in flight'. When it finally completes it will just drop the + * result silently. + */ + data->blocking = false; + if (data->fh) + list_del(&data->xfer_list); + data->fh = NULL; + + if (res == 0) { /* timed out */ + /* Check if the reply or the transmit failed */ + if (msg->timeout && (msg->tx_status & CEC_TX_STATUS_OK)) + msg->rx_status = CEC_RX_STATUS_TIMEOUT; + else + msg->tx_status = CEC_TX_STATUS_MAX_RETRIES; + } + return res > 0 ? 0 : res; +} + +/* Helper function to be used by drivers and this framework. */ +int cec_transmit_msg(struct cec_adapter *adap, struct cec_msg *msg, + bool block) +{ + int ret; + + mutex_lock(&adap->lock); + ret = cec_transmit_msg_fh(adap, msg, NULL, block); + mutex_unlock(&adap->lock); + return ret; +} +EXPORT_SYMBOL_GPL(cec_transmit_msg); + +/* + * I don't like forward references but without this the low-level + * cec_received_msg() function would come after a bunch of high-level + * CEC protocol handling functions. That was very confusing. + */ +static int cec_receive_notify(struct cec_adapter *adap, struct cec_msg *msg, + bool is_reply); + +/* Called by the CEC adapter if a message is received */ +void cec_received_msg(struct cec_adapter *adap, struct cec_msg *msg) +{ + struct cec_data *data; + u8 msg_init = cec_msg_initiator(msg); + u8 msg_dest = cec_msg_destination(msg); + bool is_reply = false; + bool valid_la = true; + + mutex_lock(&adap->lock); + msg->ts = ktime_get_ns(); + msg->rx_status = CEC_RX_STATUS_OK; + msg->tx_status = 0; + msg->sequence = msg->reply = msg->timeout = 0; + msg->flags = 0; + + dprintk(2, "cec_received_msg: %*ph\n", msg->len, msg->msg); + + /* Check if this message was for us (directed or broadcast). */ + if (!cec_msg_is_broadcast(msg)) + valid_la = cec_has_log_addr(adap, msg_dest); + + /* It's a valid message and not a poll or CDC message */ + if (valid_la && msg->len > 1 && msg->msg[1] != CEC_MSG_CDC_MESSAGE) { + u8 cmd = msg->msg[1]; + bool abort = cmd == CEC_MSG_FEATURE_ABORT; + + /* The aborted command is in msg[2] */ + if (abort) + cmd = msg->msg[2]; + + /* + * Walk over all transmitted messages that are waiting for a + * reply. + */ + list_for_each_entry(data, &adap->wait_queue, list) { + struct cec_msg *dst = &data->msg; + u8 dst_reply; + + /* Does the command match? */ + if ((abort && cmd != dst->msg[1]) || + (!abort && cmd != dst->reply)) + continue; + + /* Does the addressing match? */ + if (msg_init != cec_msg_destination(dst) && + !cec_msg_is_broadcast(dst)) + continue; + + /* We got a reply */ + msg->sequence = dst->sequence; + dst_reply = dst->reply; + *dst = *msg; + dst->reply = dst_reply; + if (abort) { + dst->reply = 0; + dst->rx_status |= CEC_RX_STATUS_FEATURE_ABORT; + } + /* Remove it from the wait_queue */ + list_del_init(&data->list); + + /* Cancel the pending timeout work */ + if (!cancel_delayed_work(&data->work)) { + mutex_unlock(&adap->lock); + flush_scheduled_work(); + mutex_lock(&adap->lock); + } + /* + * Mark this as a reply, provided someone is still + * waiting for the answer. + */ + if (data->fh) + is_reply = true; + cec_data_completed(data); + break; + } + } + mutex_unlock(&adap->lock); + + /* Pass the message on to any monitoring filehandles */ + cec_queue_msg_monitor(adap, msg, valid_la); + + /* We're done if it is not for us or a poll message */ + if (!valid_la || msg->len <= 1) + return; + + /* + * Process the message on the protocol level. If is_reply is true, + * then cec_receive_notify() won't pass on the reply to the listener(s) + * since that was already done by cec_data_completed() above. + */ + cec_receive_notify(adap, msg, is_reply); +} +EXPORT_SYMBOL_GPL(cec_received_msg); + +/* Logical Address Handling */ + +/* + * Attempt to claim a specific logical address. + * + * This function is called with adap->lock held. + */ +static int cec_config_log_addr(struct cec_adapter *adap, + unsigned int idx, + unsigned int log_addr) +{ + struct cec_log_addrs *las = &adap->log_addrs; + struct cec_msg msg = { }; + int err; + + if (cec_has_log_addr(adap, log_addr)) + return 0; + + /* Send poll message */ + msg.len = 1; + msg.msg[0] = 0xf0 | log_addr; + err = cec_transmit_msg_fh(adap, &msg, NULL, true); + + /* + * While trying to poll the physical address was reset + * and the adapter was unconfigured, so bail out. + */ + if (!adap->is_configuring) + return -EINTR; + + if (err) + return err; + + if (msg.tx_status & CEC_TX_STATUS_OK) + return 0; + + /* + * Message not acknowledged, so this logical + * address is free to use. + */ + err = adap->ops->adap_log_addr(adap, log_addr); + if (err) + return err; + + las->log_addr[idx] = log_addr; + las->log_addr_mask |= 1 << log_addr; + adap->phys_addrs[log_addr] = adap->phys_addr; + + dprintk(2, "claimed addr %d (%d)\n", log_addr, + las->primary_device_type[idx]); + return 1; +} + +/* + * Unconfigure the adapter: clear all logical addresses and send + * the state changed event. + * + * This function is called with adap->lock held. + */ +static void cec_adap_unconfigure(struct cec_adapter *adap) +{ + WARN_ON(adap->ops->adap_log_addr(adap, CEC_LOG_ADDR_INVALID)); + adap->log_addrs.log_addr_mask = 0; + adap->is_configuring = false; + adap->is_configured = false; + memset(adap->phys_addrs, 0xff, sizeof(adap->phys_addrs)); + wake_up_interruptible(&adap->kthread_waitq); + cec_post_state_event(adap); +} + +/* + * Attempt to claim the required logical addresses. + */ +static int cec_config_thread_func(void *arg) +{ + /* The various LAs for each type of device */ + static const u8 tv_log_addrs[] = { + CEC_LOG_ADDR_TV, CEC_LOG_ADDR_SPECIFIC, + CEC_LOG_ADDR_INVALID + }; + static const u8 record_log_addrs[] = { + CEC_LOG_ADDR_RECORD_1, CEC_LOG_ADDR_RECORD_2, + CEC_LOG_ADDR_RECORD_3, + CEC_LOG_ADDR_BACKUP_1, CEC_LOG_ADDR_BACKUP_2, + CEC_LOG_ADDR_INVALID + }; + static const u8 tuner_log_addrs[] = { + CEC_LOG_ADDR_TUNER_1, CEC_LOG_ADDR_TUNER_2, + CEC_LOG_ADDR_TUNER_3, CEC_LOG_ADDR_TUNER_4, + CEC_LOG_ADDR_BACKUP_1, CEC_LOG_ADDR_BACKUP_2, + CEC_LOG_ADDR_INVALID + }; + static const u8 playback_log_addrs[] = { + CEC_LOG_ADDR_PLAYBACK_1, CEC_LOG_ADDR_PLAYBACK_2, + CEC_LOG_ADDR_PLAYBACK_3, + CEC_LOG_ADDR_BACKUP_1, CEC_LOG_ADDR_BACKUP_2, + CEC_LOG_ADDR_INVALID + }; + static const u8 audiosystem_log_addrs[] = { + CEC_LOG_ADDR_AUDIOSYSTEM, + CEC_LOG_ADDR_INVALID + }; + static const u8 specific_use_log_addrs[] = { + CEC_LOG_ADDR_SPECIFIC, + CEC_LOG_ADDR_BACKUP_1, CEC_LOG_ADDR_BACKUP_2, + CEC_LOG_ADDR_INVALID + }; + static const u8 *type2addrs[6] = { + [CEC_LOG_ADDR_TYPE_TV] = tv_log_addrs, + [CEC_LOG_ADDR_TYPE_RECORD] = record_log_addrs, + [CEC_LOG_ADDR_TYPE_TUNER] = tuner_log_addrs, + [CEC_LOG_ADDR_TYPE_PLAYBACK] = playback_log_addrs, + [CEC_LOG_ADDR_TYPE_AUDIOSYSTEM] = audiosystem_log_addrs, + [CEC_LOG_ADDR_TYPE_SPECIFIC] = specific_use_log_addrs, + }; + static const u16 type2mask[] = { + [CEC_LOG_ADDR_TYPE_TV] = CEC_LOG_ADDR_MASK_TV, + [CEC_LOG_ADDR_TYPE_RECORD] = CEC_LOG_ADDR_MASK_RECORD, + [CEC_LOG_ADDR_TYPE_TUNER] = CEC_LOG_ADDR_MASK_TUNER, + [CEC_LOG_ADDR_TYPE_PLAYBACK] = CEC_LOG_ADDR_MASK_PLAYBACK, + [CEC_LOG_ADDR_TYPE_AUDIOSYSTEM] = CEC_LOG_ADDR_MASK_AUDIOSYSTEM, + [CEC_LOG_ADDR_TYPE_SPECIFIC] = CEC_LOG_ADDR_MASK_SPECIFIC, + }; + struct cec_adapter *adap = arg; + struct cec_log_addrs *las = &adap->log_addrs; + int err; + int i, j; + + mutex_lock(&adap->lock); + dprintk(1, "physical address: %x.%x.%x.%x, claim %d logical addresses\n", + cec_phys_addr_exp(adap->phys_addr), las->num_log_addrs); + las->log_addr_mask = 0; + + if (las->log_addr_type[0] == CEC_LOG_ADDR_TYPE_UNREGISTERED) + goto configured; + + for (i = 0; i < las->num_log_addrs; i++) { + unsigned int type = las->log_addr_type[i]; + const u8 *la_list; + u8 last_la; + + /* + * The TV functionality can only map to physical address 0. + * For any other address, try the Specific functionality + * instead as per the spec. + */ + if (adap->phys_addr && type == CEC_LOG_ADDR_TYPE_TV) + type = CEC_LOG_ADDR_TYPE_SPECIFIC; + + la_list = type2addrs[type]; + last_la = las->log_addr[i]; + las->log_addr[i] = CEC_LOG_ADDR_INVALID; + if (last_la == CEC_LOG_ADDR_INVALID || + last_la == CEC_LOG_ADDR_UNREGISTERED || + !(last_la & type2mask[type])) + last_la = la_list[0]; + + err = cec_config_log_addr(adap, i, last_la); + if (err > 0) /* Reused last LA */ + continue; + + if (err < 0) + goto unconfigure; + + for (j = 0; la_list[j] != CEC_LOG_ADDR_INVALID; j++) { + /* Tried this one already, skip it */ + if (la_list[j] == last_la) + continue; + /* The backup addresses are CEC 2.0 specific */ + if ((la_list[j] == CEC_LOG_ADDR_BACKUP_1 || + la_list[j] == CEC_LOG_ADDR_BACKUP_2) && + las->cec_version < CEC_OP_CEC_VERSION_2_0) + continue; + + err = cec_config_log_addr(adap, i, la_list[j]); + if (err == 0) /* LA is in use */ + continue; + if (err < 0) + goto unconfigure; + /* Done, claimed an LA */ + break; + } + + if (la_list[j] == CEC_LOG_ADDR_INVALID) + dprintk(1, "could not claim LA %d\n", i); + } + +configured: + if (adap->log_addrs.log_addr_mask == 0) { + /* Fall back to unregistered */ + las->log_addr[0] = CEC_LOG_ADDR_UNREGISTERED; + las->log_addr_mask = 1 << las->log_addr[0]; + } + adap->is_configured = true; + adap->is_configuring = false; + cec_post_state_event(adap); + mutex_unlock(&adap->lock); + + for (i = 0; i < las->num_log_addrs; i++) { + if (las->log_addr[i] == CEC_LOG_ADDR_INVALID) + continue; + + /* + * Report Features must come first according + * to CEC 2.0 + */ + if (las->log_addr[i] != CEC_LOG_ADDR_UNREGISTERED) + cec_report_features(adap, i); + cec_report_phys_addr(adap, i); + } + mutex_lock(&adap->lock); + adap->kthread_config = NULL; + mutex_unlock(&adap->lock); + complete(&adap->config_completion); + return 0; + +unconfigure: + for (i = 0; i < las->num_log_addrs; i++) + las->log_addr[i] = CEC_LOG_ADDR_INVALID; + cec_adap_unconfigure(adap); + adap->kthread_config = NULL; + mutex_unlock(&adap->lock); + complete(&adap->config_completion); + return 0; +} + +/* + * Called from either __cec_s_phys_addr or __cec_s_log_addrs to claim the + * logical addresses. + * + * This function is called with adap->lock held. + */ +static void cec_claim_log_addrs(struct cec_adapter *adap, bool block) +{ + if (WARN_ON(adap->is_configuring || adap->is_configured)) + return; + + init_completion(&adap->config_completion); + + /* Ready to kick off the thread */ + adap->is_configuring = true; + adap->kthread_config = kthread_run(cec_config_thread_func, adap, + "ceccfg-%s", adap->name); + if (IS_ERR(adap->kthread_config)) { + adap->kthread_config = NULL; + } else if (block) { + mutex_unlock(&adap->lock); + wait_for_completion(&adap->config_completion); + mutex_lock(&adap->lock); + } +} + +/* Set a new physical address and send an event notifying userspace of this. + * + * This function is called with adap->lock held. + */ +void __cec_s_phys_addr(struct cec_adapter *adap, u16 phys_addr, bool block) +{ + if (phys_addr == adap->phys_addr) + return; + + if (phys_addr == CEC_PHYS_ADDR_INVALID || + adap->phys_addr != CEC_PHYS_ADDR_INVALID) { + adap->phys_addr = CEC_PHYS_ADDR_INVALID; + cec_post_state_event(adap); + cec_adap_unconfigure(adap); + /* Disabling monitor all mode should always succeed */ + if (adap->monitor_all_cnt) + WARN_ON(call_op(adap, adap_monitor_all_enable, false)); + WARN_ON(adap->ops->adap_enable(adap, false)); + if (phys_addr == CEC_PHYS_ADDR_INVALID) + return; + } + + if (adap->ops->adap_enable(adap, true)) + return; + + if (adap->monitor_all_cnt && + call_op(adap, adap_monitor_all_enable, true)) { + WARN_ON(adap->ops->adap_enable(adap, false)); + return; + } + adap->phys_addr = phys_addr; + cec_post_state_event(adap); + if (adap->log_addrs.num_log_addrs) + cec_claim_log_addrs(adap, block); +} + +void cec_s_phys_addr(struct cec_adapter *adap, u16 phys_addr, bool block) +{ + if (IS_ERR_OR_NULL(adap)) + return; + + if (WARN_ON(adap->capabilities & CEC_CAP_PHYS_ADDR)) + return; + mutex_lock(&adap->lock); + __cec_s_phys_addr(adap, phys_addr, block); + mutex_unlock(&adap->lock); +} +EXPORT_SYMBOL_GPL(cec_s_phys_addr); + +/* + * Called from either the ioctl or a driver to set the logical addresses. + * + * This function is called with adap->lock held. + */ +int __cec_s_log_addrs(struct cec_adapter *adap, + struct cec_log_addrs *log_addrs, bool block) +{ + u16 type_mask = 0; + int i; + + if (!log_addrs || log_addrs->num_log_addrs == 0) { + adap->log_addrs.num_log_addrs = 0; + cec_adap_unconfigure(adap); + return 0; + } + + /* Ensure the osd name is 0-terminated */ + log_addrs->osd_name[sizeof(log_addrs->osd_name) - 1] = '\0'; + + /* Sanity checks */ + if (log_addrs->num_log_addrs > adap->available_log_addrs) { + dprintk(1, "num_log_addrs > %d\n", adap->available_log_addrs); + return -EINVAL; + } + + /* + * Vendor ID is a 24 bit number, so check if the value is + * within the correct range. + */ + if (log_addrs->vendor_id != CEC_VENDOR_ID_NONE && + (log_addrs->vendor_id & 0xff000000) != 0) + return -EINVAL; + + if (log_addrs->cec_version != CEC_OP_CEC_VERSION_1_4 && + log_addrs->cec_version != CEC_OP_CEC_VERSION_2_0) + return -EINVAL; + + if (log_addrs->num_log_addrs > 1) + for (i = 0; i < log_addrs->num_log_addrs; i++) + if (log_addrs->log_addr_type[i] == + CEC_LOG_ADDR_TYPE_UNREGISTERED) { + dprintk(1, "num_log_addrs > 1 can't be combined with unregistered LA\n"); + return -EINVAL; + } + + if (log_addrs->cec_version < CEC_OP_CEC_VERSION_2_0) { + memset(log_addrs->all_device_types, 0, + sizeof(log_addrs->all_device_types)); + memset(log_addrs->features, 0, sizeof(log_addrs->features)); + } + + for (i = 0; i < log_addrs->num_log_addrs; i++) { + u8 *features = log_addrs->features[i]; + bool op_is_dev_features = false; + + log_addrs->log_addr[i] = CEC_LOG_ADDR_INVALID; + if (type_mask & (1 << log_addrs->log_addr_type[i])) { + dprintk(1, "duplicate logical address type\n"); + return -EINVAL; + } + type_mask |= 1 << log_addrs->log_addr_type[i]; + if ((type_mask & (1 << CEC_LOG_ADDR_TYPE_RECORD)) && + (type_mask & (1 << CEC_LOG_ADDR_TYPE_PLAYBACK))) { + /* Record already contains the playback functionality */ + dprintk(1, "invalid record + playback combination\n"); + return -EINVAL; + } + if (log_addrs->primary_device_type[i] > + CEC_OP_PRIM_DEVTYPE_PROCESSOR) { + dprintk(1, "unknown primary device type\n"); + return -EINVAL; + } + if (log_addrs->primary_device_type[i] == 2) { + dprintk(1, "invalid primary device type\n"); + return -EINVAL; + } + if (log_addrs->log_addr_type[i] > CEC_LOG_ADDR_TYPE_UNREGISTERED) { + dprintk(1, "unknown logical address type\n"); + return -EINVAL; + } + if (log_addrs->cec_version < CEC_OP_CEC_VERSION_2_0) + continue; + + for (i = 0; i < ARRAY_SIZE(log_addrs->features[0]); i++) { + if ((features[i] & 0x80) == 0) { + if (op_is_dev_features) + break; + op_is_dev_features = true; + } + } + if (!op_is_dev_features || + i == ARRAY_SIZE(log_addrs->features[0])) { + dprintk(1, "malformed features\n"); + return -EINVAL; + } + } + + if (log_addrs->cec_version >= CEC_OP_CEC_VERSION_2_0) { + if (log_addrs->num_log_addrs > 2) { + dprintk(1, "CEC 2.0 allows no more than 2 logical addresses\n"); + return -EINVAL; + } + if (log_addrs->num_log_addrs == 2) { + if (!(type_mask & ((1 << CEC_LOG_ADDR_TYPE_AUDIOSYSTEM) | + (1 << CEC_LOG_ADDR_TYPE_TV)))) { + dprintk(1, "Two LAs is only allowed for audiosystem and TV\n"); + return -EINVAL; + } + if (!(type_mask & ((1 << CEC_LOG_ADDR_TYPE_PLAYBACK) | + (1 << CEC_LOG_ADDR_TYPE_RECORD)))) { + dprintk(1, "An audiosystem/TV can only be combined with record or playback\n"); + return -EINVAL; + } + } + } + + log_addrs->log_addr_mask = adap->log_addrs.log_addr_mask; + adap->log_addrs = *log_addrs; + if (adap->phys_addr != CEC_PHYS_ADDR_INVALID) + cec_claim_log_addrs(adap, block); + return 0; +} + +int cec_s_log_addrs(struct cec_adapter *adap, + struct cec_log_addrs *log_addrs, bool block) +{ + int err; + + if (WARN_ON(adap->capabilities & CEC_CAP_LOG_ADDRS)) + return -EINVAL; + mutex_lock(&adap->lock); + err = __cec_s_log_addrs(adap, log_addrs, block); + mutex_unlock(&adap->lock); + return err; +} +EXPORT_SYMBOL_GPL(cec_s_log_addrs); + +/* High-level core CEC message handling */ + +/* Transmit the Report Features message */ +static int cec_report_features(struct cec_adapter *adap, unsigned int la_idx) +{ + struct cec_msg msg = { }; + const struct cec_log_addrs *las = &adap->log_addrs; + const u8 *features = las->features[la_idx]; + bool op_is_dev_features = false; + unsigned int idx; + + /* This is 2.0 and up only */ + if (adap->log_addrs.cec_version < CEC_OP_CEC_VERSION_2_0) + return 0; + + /* Report Features */ + msg.msg[0] = (las->log_addr[la_idx] << 4) | 0x0f; + msg.len = 4; + msg.msg[1] = CEC_MSG_REPORT_FEATURES; + msg.msg[2] = adap->log_addrs.cec_version; + msg.msg[3] = las->all_device_types[la_idx]; + + /* Write RC Profiles first, then Device Features */ + for (idx = 0; idx < ARRAY_SIZE(las->features[0]); idx++) { + msg.msg[msg.len++] = features[idx]; + if ((features[idx] & CEC_OP_FEAT_EXT) == 0) { + if (op_is_dev_features) + break; + op_is_dev_features = true; + } + } + return cec_transmit_msg(adap, &msg, false); +} + +/* Transmit the Report Physical Address message */ +static int cec_report_phys_addr(struct cec_adapter *adap, unsigned int la_idx) +{ + const struct cec_log_addrs *las = &adap->log_addrs; + struct cec_msg msg = { }; + + /* Report Physical Address */ + msg.msg[0] = (las->log_addr[la_idx] << 4) | 0x0f; + cec_msg_report_physical_addr(&msg, adap->phys_addr, + las->primary_device_type[la_idx]); + dprintk(2, "config: la %d pa %x.%x.%x.%x\n", + las->log_addr[la_idx], + cec_phys_addr_exp(adap->phys_addr)); + return cec_transmit_msg(adap, &msg, false); +} + +/* Transmit the Feature Abort message */ +static int cec_feature_abort_reason(struct cec_adapter *adap, + struct cec_msg *msg, u8 reason) +{ + struct cec_msg tx_msg = { }; + + /* + * Don't reply with CEC_MSG_FEATURE_ABORT to a CEC_MSG_FEATURE_ABORT + * message! + */ + if (msg->msg[1] == CEC_MSG_FEATURE_ABORT) + return 0; + cec_msg_set_reply_to(&tx_msg, msg); + cec_msg_feature_abort(&tx_msg, msg->msg[1], reason); + return cec_transmit_msg(adap, &tx_msg, false); +} + +static int cec_feature_abort(struct cec_adapter *adap, struct cec_msg *msg) +{ + return cec_feature_abort_reason(adap, msg, + CEC_OP_ABORT_UNRECOGNIZED_OP); +} + +static int cec_feature_refused(struct cec_adapter *adap, struct cec_msg *msg) +{ + return cec_feature_abort_reason(adap, msg, + CEC_OP_ABORT_REFUSED); +} + +/* + * Called when a CEC message is received. This function will do any + * necessary core processing. The is_reply bool is true if this message + * is a reply to an earlier transmit. + * + * The message is either a broadcast message or a valid directed message. + */ +static int cec_receive_notify(struct cec_adapter *adap, struct cec_msg *msg, + bool is_reply) +{ + bool is_broadcast = cec_msg_is_broadcast(msg); + u8 dest_laddr = cec_msg_destination(msg); + u8 init_laddr = cec_msg_initiator(msg); + u8 devtype = cec_log_addr2dev(adap, dest_laddr); + int la_idx = cec_log_addr2idx(adap, dest_laddr); + bool is_directed = la_idx >= 0; + bool from_unregistered = init_laddr == 0xf; + struct cec_msg tx_cec_msg = { }; + + dprintk(1, "cec_receive_notify: %*ph\n", msg->len, msg->msg); + + if (adap->ops->received) { + /* Allow drivers to process the message first */ + if (adap->ops->received(adap, msg) != -ENOMSG) + return 0; + } + + /* + * REPORT_PHYSICAL_ADDR, CEC_MSG_USER_CONTROL_PRESSED and + * CEC_MSG_USER_CONTROL_RELEASED messages always have to be + * handled by the CEC core, even if the passthrough mode is on. + * The others are just ignored if passthrough mode is on. + */ + switch (msg->msg[1]) { + case CEC_MSG_GET_CEC_VERSION: + case CEC_MSG_GIVE_DEVICE_VENDOR_ID: + case CEC_MSG_ABORT: + case CEC_MSG_GIVE_DEVICE_POWER_STATUS: + case CEC_MSG_GIVE_PHYSICAL_ADDR: + case CEC_MSG_GIVE_OSD_NAME: + case CEC_MSG_GIVE_FEATURES: + /* + * Skip processing these messages if the passthrough mode + * is on. + */ + if (adap->passthrough) + goto skip_processing; + /* Ignore if addressing is wrong */ + if (is_broadcast || from_unregistered) + return 0; + break; + + case CEC_MSG_USER_CONTROL_PRESSED: + case CEC_MSG_USER_CONTROL_RELEASED: + /* Wrong addressing mode: don't process */ + if (is_broadcast || from_unregistered) + goto skip_processing; + break; + + case CEC_MSG_REPORT_PHYSICAL_ADDR: + /* + * This message is always processed, regardless of the + * passthrough setting. + * + * Exception: don't process if wrong addressing mode. + */ + if (!is_broadcast) + goto skip_processing; + break; + + default: + break; + } + + cec_msg_set_reply_to(&tx_cec_msg, msg); + + switch (msg->msg[1]) { + /* The following messages are processed but still passed through */ + case CEC_MSG_REPORT_PHYSICAL_ADDR: + adap->phys_addrs[init_laddr] = + (msg->msg[2] << 8) | msg->msg[3]; + dprintk(1, "Reported physical address %04x for logical address %d\n", + adap->phys_addrs[init_laddr], init_laddr); + break; + + case CEC_MSG_USER_CONTROL_PRESSED: + if (!(adap->capabilities & CEC_CAP_RC)) + break; + +#if IS_ENABLED(CONFIG_RC_CORE) + switch (msg->msg[2]) { + /* + * Play function, this message can have variable length + * depending on the specific play function that is used. + */ + case 0x60: + if (msg->len == 2) + rc_keydown(adap->rc, RC_TYPE_CEC, + msg->msg[2], 0); + else + rc_keydown(adap->rc, RC_TYPE_CEC, + msg->msg[2] << 8 | msg->msg[3], 0); + break; + /* + * Other function messages that are not handled. + * Currently the RC framework does not allow to supply an + * additional parameter to a keypress. These "keys" contain + * other information such as channel number, an input number + * etc. + * For the time being these messages are not processed by the + * framework and are simply forwarded to the user space. + */ + case 0x56: case 0x57: + case 0x67: case 0x68: case 0x69: case 0x6a: + break; + default: + rc_keydown(adap->rc, RC_TYPE_CEC, msg->msg[2], 0); + break; + } +#endif + break; + + case CEC_MSG_USER_CONTROL_RELEASED: + if (!(adap->capabilities & CEC_CAP_RC)) + break; +#if IS_ENABLED(CONFIG_RC_CORE) + rc_keyup(adap->rc); +#endif + break; + + /* + * The remaining messages are only processed if the passthrough mode + * is off. + */ + case CEC_MSG_GET_CEC_VERSION: + cec_msg_cec_version(&tx_cec_msg, adap->log_addrs.cec_version); + return cec_transmit_msg(adap, &tx_cec_msg, false); + + case CEC_MSG_GIVE_PHYSICAL_ADDR: + /* Do nothing for CEC switches using addr 15 */ + if (devtype == CEC_OP_PRIM_DEVTYPE_SWITCH && dest_laddr == 15) + return 0; + cec_msg_report_physical_addr(&tx_cec_msg, adap->phys_addr, devtype); + return cec_transmit_msg(adap, &tx_cec_msg, false); + + case CEC_MSG_GIVE_DEVICE_VENDOR_ID: + if (adap->log_addrs.vendor_id == CEC_VENDOR_ID_NONE) + return cec_feature_abort(adap, msg); + cec_msg_device_vendor_id(&tx_cec_msg, adap->log_addrs.vendor_id); + return cec_transmit_msg(adap, &tx_cec_msg, false); + + case CEC_MSG_ABORT: + /* Do nothing for CEC switches */ + if (devtype == CEC_OP_PRIM_DEVTYPE_SWITCH) + return 0; + return cec_feature_refused(adap, msg); + + case CEC_MSG_GIVE_OSD_NAME: { + if (adap->log_addrs.osd_name[0] == 0) + return cec_feature_abort(adap, msg); + cec_msg_set_osd_name(&tx_cec_msg, adap->log_addrs.osd_name); + return cec_transmit_msg(adap, &tx_cec_msg, false); + } + + case CEC_MSG_GIVE_FEATURES: + if (adap->log_addrs.cec_version >= CEC_OP_CEC_VERSION_2_0) + return cec_report_features(adap, la_idx); + return 0; + + default: + /* + * Unprocessed messages are aborted if userspace isn't doing + * any processing either. + */ + if (is_directed && !is_reply && !adap->follower_cnt && + !adap->cec_follower && msg->msg[1] != CEC_MSG_FEATURE_ABORT) + return cec_feature_abort(adap, msg); + break; + } + +skip_processing: + /* If this was a reply, then we're done */ + if (is_reply) + return 0; + + /* + * Send to the exclusive follower if there is one, otherwise send + * to all followers. + */ + if (adap->cec_follower) + cec_queue_msg_fh(adap->cec_follower, msg); + else + cec_queue_msg_followers(adap, msg); + return 0; +} + +/* + * Helper functions to keep track of the 'monitor all' use count. + * + * These functions are called with adap->lock held. + */ +int cec_monitor_all_cnt_inc(struct cec_adapter *adap) +{ + int ret = 0; + + if (adap->monitor_all_cnt == 0) + ret = call_op(adap, adap_monitor_all_enable, 1); + if (ret == 0) + adap->monitor_all_cnt++; + return ret; +} + +void cec_monitor_all_cnt_dec(struct cec_adapter *adap) +{ + adap->monitor_all_cnt--; + if (adap->monitor_all_cnt == 0) + WARN_ON(call_op(adap, adap_monitor_all_enable, 0)); +} + +#ifdef CONFIG_MEDIA_CEC_DEBUG +/* + * Log the current state of the CEC adapter. + * Very useful for debugging. + */ +int cec_adap_status(struct seq_file *file, void *priv) +{ + struct cec_adapter *adap = dev_get_drvdata(file->private); + struct cec_data *data; + + mutex_lock(&adap->lock); + seq_printf(file, "configured: %d\n", adap->is_configured); + seq_printf(file, "configuring: %d\n", adap->is_configuring); + seq_printf(file, "phys_addr: %x.%x.%x.%x\n", + cec_phys_addr_exp(adap->phys_addr)); + seq_printf(file, "number of LAs: %d\n", adap->log_addrs.num_log_addrs); + seq_printf(file, "LA mask: 0x%04x\n", adap->log_addrs.log_addr_mask); + if (adap->cec_follower) + seq_printf(file, "has CEC follower%s\n", + adap->passthrough ? " (in passthrough mode)" : ""); + if (adap->cec_initiator) + seq_puts(file, "has CEC initiator\n"); + if (adap->monitor_all_cnt) + seq_printf(file, "file handles in Monitor All mode: %u\n", + adap->monitor_all_cnt); + data = adap->transmitting; + if (data) + seq_printf(file, "transmitting message: %*ph (reply: %02x)\n", + data->msg.len, data->msg.msg, data->msg.reply); + list_for_each_entry(data, &adap->transmit_queue, list) { + seq_printf(file, "queued tx message: %*ph (reply: %02x)\n", + data->msg.len, data->msg.msg, data->msg.reply); + } + list_for_each_entry(data, &adap->wait_queue, list) { + seq_printf(file, "message waiting for reply: %*ph (reply: %02x)\n", + data->msg.len, data->msg.msg, data->msg.reply); + } + + call_void_op(adap, adap_status, file); + mutex_unlock(&adap->lock); + return 0; +} +#endif |