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	Version: linux-6.0.1 spark-3.0.0 hadoop-3.2.0-src hadoop-3.3.0-src spark-2.4.7 linux-4.15.13 hadoop-2.7.4-src Revert   Change

 // SPDX-License-Identifier: GPL-2.0-only
 /*
  * cec-adap.c - HDMI Consumer Electronics Control framework - CEC adapter
  *
  * Copyright 2016 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
  */
 
 #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 <drm/drm_connector.h>
 #include <drm/drm_device.h>
 #include <drm/drm_edid.h>
 #include <drm/drm_file.h>
 
 #include "cec-priv.h"
 
 static void cec_fill_msg_report_features(struct cec_adapter *adap,
                      struct cec_msg *msg,
                      unsigned int la_idx);
 
 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];
 }
 
 u16 cec_get_edid_phys_addr(const u8 *edid, unsigned int size,
                unsigned int *offset)
 {
     unsigned int loc = cec_get_edid_spa_location(edid, size);
 
     if (offset)
         *offset = loc;
     if (loc == 0)
         return CEC_PHYS_ADDR_INVALID;
     return (edid[loc] << 8) | edid[loc + 1];
 }
 EXPORT_SYMBOL_GPL(cec_get_edid_phys_addr);
 
 void cec_fill_conn_info_from_drm(struct cec_connector_info *conn_info,
                  const struct drm_connector *connector)
 {
     memset(conn_info, 0, sizeof(*conn_info));
     conn_info->type = CEC_CONNECTOR_TYPE_DRM;
     conn_info->drm.card_no = connector->dev->primary->index;
     conn_info->drm.connector_id = connector->base.id;
 }
 EXPORT_SYMBOL_GPL(cec_fill_conn_info_from_drm);
 
 /*
  * Queue a new event for this filehandle. If ts == 0, then set it
  * to the current time.
  *
  * We keep a queue of at most max_event events where max_event differs
  * per event. If the queue becomes full, then drop the oldest event and
  * keep track of how many events we've dropped.
  */
 void cec_queue_event_fh(struct cec_fh *fh,
             const struct cec_event *new_ev, u64 ts)
 {
     static const u16 max_events[CEC_NUM_EVENTS] = {
         1, 1, 800, 800, 8, 8, 8, 8
     };
     struct cec_event_entry *entry;
     unsigned int ev_idx = new_ev->event - 1;
 
     if (WARN_ON(ev_idx >= ARRAY_SIZE(fh->events)))
         return;
 
     if (ts == 0)
         ts = ktime_get_ns();
 
     mutex_lock(&fh->lock);
     if (ev_idx < CEC_NUM_CORE_EVENTS)
         entry = &fh->core_events[ev_idx];
     else
         entry = kmalloc(sizeof(*entry), GFP_KERNEL);
     if (entry) {
         if (new_ev->event == CEC_EVENT_LOST_MSGS &&
             fh->queued_events[ev_idx]) {
             entry->ev.lost_msgs.lost_msgs +=
                 new_ev->lost_msgs.lost_msgs;
             goto unlock;
         }
         entry->ev = *new_ev;
         entry->ev.ts = ts;
 
         if (fh->queued_events[ev_idx] < max_events[ev_idx]) {
             /* Add new msg at the end of the queue */
             list_add_tail(&entry->list, &fh->events[ev_idx]);
             fh->queued_events[ev_idx]++;
             fh->total_queued_events++;
             goto unlock;
         }
 
         if (ev_idx >= CEC_NUM_CORE_EVENTS) {
             list_add_tail(&entry->list, &fh->events[ev_idx]);
             /* drop the oldest event */
             entry = list_first_entry(&fh->events[ev_idx],
                          struct cec_event_entry, list);
             list_del(&entry->list);
             kfree(entry);
         }
     }
     /* Mark that events were lost */
     entry = list_first_entry_or_null(&fh->events[ev_idx],
                      struct cec_event_entry, list);
     if (entry)
         entry->ev.flags |= CEC_EVENT_FL_DROPPED_EVENTS;
 
 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.lock_fhs);
     list_for_each_entry(fh, &adap->devnode.fhs, list)
         cec_queue_event_fh(fh, ev, ts);
     mutex_unlock(&adap->devnode.lock_fhs);
 }
 
 /* Notify userspace that the CEC pin changed state at the given time. */
 void cec_queue_pin_cec_event(struct cec_adapter *adap, bool is_high,
                  bool dropped_events, ktime_t ts)
 {
     struct cec_event ev = {
         .event = is_high ? CEC_EVENT_PIN_CEC_HIGH :
                    CEC_EVENT_PIN_CEC_LOW,
         .flags = dropped_events ? CEC_EVENT_FL_DROPPED_EVENTS : 0,
     };
     struct cec_fh *fh;
 
     mutex_lock(&adap->devnode.lock_fhs);
     list_for_each_entry(fh, &adap->devnode.fhs, list) {
         if (fh->mode_follower == CEC_MODE_MONITOR_PIN)
             cec_queue_event_fh(fh, &ev, ktime_to_ns(ts));
     }
     mutex_unlock(&adap->devnode.lock_fhs);
 }
 EXPORT_SYMBOL_GPL(cec_queue_pin_cec_event);
 
 /* Notify userspace that the HPD pin changed state at the given time. */
 void cec_queue_pin_hpd_event(struct cec_adapter *adap, bool is_high, ktime_t ts)
 {
     struct cec_event ev = {
         .event = is_high ? CEC_EVENT_PIN_HPD_HIGH :
                    CEC_EVENT_PIN_HPD_LOW,
     };
     struct cec_fh *fh;
 
     mutex_lock(&adap->devnode.lock_fhs);
     list_for_each_entry(fh, &adap->devnode.fhs, list)
         cec_queue_event_fh(fh, &ev, ktime_to_ns(ts));
     mutex_unlock(&adap->devnode.lock_fhs);
 }
 EXPORT_SYMBOL_GPL(cec_queue_pin_hpd_event);
 
 /* Notify userspace that the 5V pin changed state at the given time. */
 void cec_queue_pin_5v_event(struct cec_adapter *adap, bool is_high, ktime_t ts)
 {
     struct cec_event ev = {
         .event = is_high ? CEC_EVENT_PIN_5V_HIGH :
                    CEC_EVENT_PIN_5V_LOW,
     };
     struct cec_fh *fh;
 
     mutex_lock(&adap->devnode.lock_fhs);
     list_for_each_entry(fh, &adap->devnode.fhs, list)
         cec_queue_event_fh(fh, &ev, ktime_to_ns(ts));
     mutex_unlock(&adap->devnode.lock_fhs);
 }
 EXPORT_SYMBOL_GPL(cec_queue_pin_5v_event);
 
 /*
  * Queue a new message for this filehandle.
  *
  * We keep a queue of at most CEC_MAX_MSG_RX_QUEUE_SZ messages. If the
  * queue becomes full, then drop the oldest message and keep track
  * of how many messages we've dropped.
  */
 static void cec_queue_msg_fh(struct cec_fh *fh, const struct cec_msg *msg)
 {
     static const struct cec_event ev_lost_msgs = {
         .event = CEC_EVENT_LOST_MSGS,
         .flags = 0,
         {
             .lost_msgs = { 1 },
         },
     };
     struct cec_msg_entry *entry;
 
     mutex_lock(&fh->lock);
     entry = kmalloc(sizeof(*entry), GFP_KERNEL);
     if (entry) {
         entry->msg = *msg;
         /* Add new msg at the end of the queue */
         list_add_tail(&entry->list, &fh->msgs);
 
         if (fh->queued_msgs < CEC_MAX_MSG_RX_QUEUE_SZ) {
             /* All is fine if there is enough room */
             fh->queued_msgs++;
             mutex_unlock(&fh->lock);
             wake_up_interruptible(&fh->wait);
             return;
         }
 
         /*
          * if the message queue is full, then drop the oldest one and
          * send a lost message event.
          */
         entry = list_first_entry(&fh->msgs, struct cec_msg_entry, list);
         list_del(&entry->list);
         kfree(entry);
     }
     mutex_unlock(&fh->lock);
 
     /*
      * We lost a message, either because kmalloc failed or the queue
      * was full.
      */
     cec_queue_event_fh(fh, &ev_lost_msgs, ktime_get_ns());
 }
 
 /*
  * 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.lock_fhs);
     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.lock_fhs);
 }
 
 /*
  * 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.lock_fhs);
     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.lock_fhs);
 }
 
 /* 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;
     ev.state_change.have_conn_info =
         adap->conn_info.type != CEC_CONNECTOR_TYPE_NO_CONNECTOR;
     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_init(&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, or the reply timed out.
  *
  * This function is called with adap->lock held.
  */
 static void cec_data_cancel(struct cec_data *data, u8 tx_status, u8 rx_status)
 {
     struct cec_adapter *adap = data->adap;
 
     /*
      * It's either the current transmit, or it is a pending
      * transmit. Take the appropriate action to clear it.
      */
     if (adap->transmitting == data) {
         adap->transmitting = NULL;
     } else {
         list_del_init(&data->list);
         if (!(data->msg.tx_status & CEC_TX_STATUS_OK))
             if (!WARN_ON(!adap->transmit_queue_sz))
                 adap->transmit_queue_sz--;
     }
 
     if (data->msg.tx_status & CEC_TX_STATUS_OK) {
         data->msg.rx_ts = ktime_get_ns();
         data->msg.rx_status = rx_status;
         if (!data->blocking)
             data->msg.tx_status = 0;
     } else {
         data->msg.tx_ts = ktime_get_ns();
         data->msg.tx_status |= tx_status |
                        CEC_TX_STATUS_MAX_RETRIES;
         data->msg.tx_error_cnt++;
         data->attempts = 0;
         if (!data->blocking)
             data->msg.rx_status = 0;
     }
 
     /* Queue transmitted message for monitoring purposes */
     cec_queue_msg_monitor(adap, &data->msg, 1);
 
     if (!data->blocking && data->msg.sequence)
         /* Allow drivers to process the message first */
         call_op(adap, received, &data->msg);
 
     cec_data_completed(data);
 }
 
 /*
  * Flush all pending transmits and cancel any pending timeout work.
  *
  * This function is called with adap->lock held.
  */
 static void cec_flush(struct cec_adapter *adap)
 {
     struct cec_data *data, *n;
 
     /*
      * 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, CEC_TX_STATUS_ABORTED, 0);
     }
     if (adap->transmitting)
         adap->transmit_in_progress_aborted = true;
 
     /* Cancel the pending timeout work. */
     list_for_each_entry_safe(data, n, &adap->wait_queue, list) {
         if (cancel_delayed_work(&data->work))
             cec_data_cancel(data, CEC_TX_STATUS_OK, CEC_RX_STATUS_ABORTED);
         /*
          * If cancel_delayed_work returned false, then
          * the cec_wait_timeout function is running,
          * which will call cec_data_completed. So no
          * need to do anything special in that case.
          */
     }
     /*
      * If something went wrong and this counter isn't what it should
      * be, then this will reset it back to 0. Warn if it is not 0,
      * since it indicates a bug, either in this framework or in a
      * CEC driver.
      */
     if (WARN_ON(adap->transmit_queue_sz))
         adap->transmit_queue_sz = 0;
 }
 
 /*
  * 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->transmit_in_progress) {
             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,
                 (adap->needs_hpd &&
                  (!adap->is_configured && !adap->is_configuring)) ||
                 kthread_should_stop() ||
                 (!adap->transmit_in_progress &&
                  !list_empty(&adap->transmit_queue)),
                 msecs_to_jiffies(adap->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->transmit_in_progress &&
                  !list_empty(&adap->transmit_queue)));
         }
 
         mutex_lock(&adap->lock);
 
         if ((adap->needs_hpd &&
              (!adap->is_configured && !adap->is_configuring)) ||
             kthread_should_stop()) {
             cec_flush(adap);
             goto unlock;
         }
 
         if (adap->transmit_in_progress && timeout) {
             /*
              * If we timeout, then log that. Normally this does
              * not happen and it is an indication of a faulty CEC
              * adapter driver, or the CEC bus is in some weird
              * state. On rare occasions it can happen if there is
              * so much traffic on the bus that the adapter was
              * unable to transmit for xfer_timeout_ms (2.1s by
              * default).
              */
             if (adap->transmitting) {
                 pr_warn("cec-%s: message %*ph timed out\n", adap->name,
                     adap->transmitting->msg.len,
                     adap->transmitting->msg.msg);
                 /* Just give up on this. */
                 cec_data_cancel(adap->transmitting,
                         CEC_TX_STATUS_TIMEOUT, 0);
             } else {
                 pr_warn("cec-%s: transmit timed out\n", adap->name);
             }
             adap->transmit_in_progress = false;
             adap->tx_timeouts++;
             goto unlock;
         }
 
         /*
          * If we are still transmitting, or there is nothing new to
          * transmit, then just continue waiting.
          */
         if (adap->transmit_in_progress || 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);
         if (!WARN_ON(!data->adap->transmit_queue_sz))
             adap->transmit_queue_sz--;
 
         /* 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 (adap->last_initiator !=
                cec_msg_initiator(&data->msg)) {
             /* should be >= 5 data bit periods for new initiator */
             signal_free_time = CEC_SIGNAL_FREE_TIME_NEW_INITIATOR;
             adap->last_initiator = cec_msg_initiator(&data->msg);
         } 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;
 
         adap->transmit_in_progress_aborted = false;
         /* Tell the adapter to transmit, cancel on error */
         if (call_op(adap, adap_transmit, data->attempts,
                 signal_free_time, &data->msg))
             cec_data_cancel(data, CEC_TX_STATUS_ABORTED, 0);
         else
             adap->transmit_in_progress = true;
 
 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_ts(struct cec_adapter *adap, u8 status,
               u8 arb_lost_cnt, u8 nack_cnt, u8 low_drive_cnt,
               u8 error_cnt, ktime_t ts)
 {
     struct cec_data *data;
     struct cec_msg *msg;
     unsigned int attempts_made = arb_lost_cnt + nack_cnt +
                      low_drive_cnt + error_cnt;
     bool done = status & (CEC_TX_STATUS_MAX_RETRIES | CEC_TX_STATUS_OK);
     bool aborted = adap->transmit_in_progress_aborted;
 
     dprintk(2, "%s: status 0x%02x\n", __func__, status);
     if (attempts_made < 1)
         attempts_made = 1;
 
     mutex_lock(&adap->lock);
     data = adap->transmitting;
     if (!data) {
         /*
          * This might happen if a transmit was issued and the cable is
          * unplugged while the transmit is ongoing. Ignore this
          * transmit in that case.
          */
         if (!adap->transmit_in_progress)
             dprintk(1, "%s was called without an ongoing transmit!\n",
                 __func__);
         adap->transmit_in_progress = false;
         goto wake_thread;
     }
     adap->transmit_in_progress = false;
     adap->transmit_in_progress_aborted = false;
 
     msg = &data->msg;
 
     /* Drivers must fill in the status! */
     WARN_ON(status == 0);
     msg->tx_ts = ktime_to_ns(ts);
     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 (!aborted && data->attempts > attempts_made && !done) {
         /* Retry this message */
         data->attempts -= attempts_made;
         if (msg->timeout)
             dprintk(2, "retransmit: %*ph (attempts: %d, wait for 0x%02x)\n",
                 msg->len, msg->msg, data->attempts, msg->reply);
         else
             dprintk(2, "retransmit: %*ph (attempts: %d)\n",
                 msg->len, msg->msg, data->attempts);
         /* Add the message in front of the transmit queue */
         list_add(&data->list, &adap->transmit_queue);
         adap->transmit_queue_sz++;
         goto wake_thread;
     }
 
     if (aborted && !done)
         status |= CEC_TX_STATUS_ABORTED;
     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);
 
     if ((status & CEC_TX_STATUS_OK) && adap->is_configured &&
         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);
     mutex_unlock(&adap->lock);
 }
 EXPORT_SYMBOL_GPL(cec_transmit_done_ts);
 
 void cec_transmit_attempt_done_ts(struct cec_adapter *adap,
                   u8 status, ktime_t ts)
 {
     switch (status & ~CEC_TX_STATUS_MAX_RETRIES) {
     case CEC_TX_STATUS_OK:
         cec_transmit_done_ts(adap, status, 0, 0, 0, 0, ts);
         return;
     case CEC_TX_STATUS_ARB_LOST:
         cec_transmit_done_ts(adap, status, 1, 0, 0, 0, ts);
         return;
     case CEC_TX_STATUS_NACK:
         cec_transmit_done_ts(adap, status, 0, 1, 0, 0, ts);
         return;
     case CEC_TX_STATUS_LOW_DRIVE:
         cec_transmit_done_ts(adap, status, 0, 0, 1, 0, ts);
         return;
     case CEC_TX_STATUS_ERROR:
         cec_transmit_done_ts(adap, status, 0, 0, 0, 1, ts);
         return;
     default:
         /* Should never happen */
         WARN(1, "cec-%s: invalid status 0x%02x\n", adap->name, status);
         return;
     }
 }
 EXPORT_SYMBOL_GPL(cec_transmit_attempt_done_ts);
 
 /*
  * 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);
     cec_data_cancel(data, CEC_TX_STATUS_OK, CEC_RX_STATUS_TIMEOUT);
 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;
     bool is_raw = msg_is_raw(msg);
 
     if (adap->devnode.unregistered)
         return -ENODEV;
 
     msg->rx_ts = 0;
     msg->tx_ts = 0;
     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;
     msg->sequence = 0;
 
     if (msg->reply && msg->timeout == 0) {
         /* Make sure the timeout isn't 0. */
         msg->timeout = 1000;
     }
     msg->flags &= CEC_MSG_FL_REPLY_TO_FOLLOWERS | CEC_MSG_FL_RAW;
 
     if (!msg->timeout)
         msg->flags &= ~CEC_MSG_FL_REPLY_TO_FOLLOWERS;
 
     /* Sanity checks */
     if (msg->len == 0 || msg->len > CEC_MAX_MSG_SIZE) {
         dprintk(1, "%s: invalid length %d\n", __func__, msg->len);
         return -EINVAL;
     }
 
     memset(msg->msg + msg->len, 0, sizeof(msg->msg) - msg->len);
 
     if (msg->timeout)
         dprintk(2, "%s: %*ph (wait for 0x%02x%s)\n",
             __func__, msg->len, msg->msg, msg->reply,
             !block ? ", nb" : "");
     else
         dprintk(2, "%s: %*ph%s\n",
             __func__, msg->len, msg->msg, !block ? " (nb)" : "");
 
     if (msg->timeout && msg->len == 1) {
         dprintk(1, "%s: can't reply to poll msg\n", __func__);
         return -EINVAL;
     }
 
     if (is_raw) {
         if (!capable(CAP_SYS_RAWIO))
             return -EPERM;
     } else {
         /* A CDC-Only device can only send CDC messages */
         if ((adap->log_addrs.flags & CEC_LOG_ADDRS_FL_CDC_ONLY) &&
             (msg->len == 1 || msg->msg[1] != CEC_MSG_CDC_MESSAGE)) {
             dprintk(1, "%s: not a CDC message\n", __func__);
             return -EINVAL;
         }
 
         if (msg->len >= 4 && msg->msg[1] == CEC_MSG_CDC_MESSAGE) {
             msg->msg[2] = adap->phys_addr >> 8;
             msg->msg[3] = adap->phys_addr & 0xff;
         }
 
         if (msg->len == 1) {
             if (cec_msg_destination(msg) == 0xf) {
                 dprintk(1, "%s: invalid poll message\n",
                     __func__);
                 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_ts = ktime_get_ns();
                 msg->tx_status = CEC_TX_STATUS_NACK |
                     CEC_TX_STATUS_MAX_RETRIES;
                 msg->tx_nack_cnt = 1;
                 msg->sequence = ++adap->sequence;
                 if (!msg->sequence)
                     msg->sequence = ++adap->sequence;
                 return 0;
             }
         }
         if (msg->len > 1 && !cec_msg_is_broadcast(msg) &&
             cec_has_log_addr(adap, cec_msg_destination(msg))) {
             dprintk(1, "%s: destination is the adapter itself\n",
                 __func__);
             return -EINVAL;
         }
         if (msg->len > 1 && adap->is_configured &&
             !cec_has_log_addr(adap, cec_msg_initiator(msg))) {
             dprintk(1, "%s: initiator has unknown logical address %d\n",
                 __func__, cec_msg_initiator(msg));
             return -EINVAL;
         }
         /*
          * Special case: allow Ping and IMAGE/TEXT_VIEW_ON to be
          * transmitted to a TV, even if the adapter is unconfigured.
          * This makes it possible to detect or wake up displays that
          * pull down the HPD when in standby.
          */
         if (!adap->is_configured && !adap->is_configuring &&
             (msg->len > 2 ||
              cec_msg_destination(msg) != CEC_LOG_ADDR_TV ||
              (msg->len == 2 && msg->msg[1] != CEC_MSG_IMAGE_VIEW_ON &&
               msg->msg[1] != CEC_MSG_TEXT_VIEW_ON))) {
             dprintk(1, "%s: adapter is unconfigured\n", __func__);
             return -ENONET;
         }
     }
 
     if (!adap->is_configured && !adap->is_configuring) {
         if (adap->needs_hpd) {
             dprintk(1, "%s: adapter is unconfigured and needs HPD\n",
                 __func__);
             return -ENONET;
         }
         if (msg->reply) {
             dprintk(1, "%s: invalid msg->reply\n", __func__);
             return -EINVAL;
         }
     }
 
     if (adap->transmit_queue_sz >= CEC_MAX_MSG_TX_QUEUE_SZ) {
         dprintk(2, "%s: transmit queue full\n", __func__);
         return -EBUSY;
     }
 
     data = kzalloc(sizeof(*data), GFP_KERNEL);
     if (!data)
         return -ENOMEM;
 
     msg->sequence = ++adap->sequence;
     if (!msg->sequence)
         msg->sequence = ++adap->sequence;
 
     data->msg = *msg;
     data->fh = fh;
     data->adap = adap;
     data->blocking = block;
 
     init_completion(&data->c);
     INIT_DELAYED_WORK(&data->work, cec_wait_timeout);
 
     if (fh)
         list_add_tail(&data->xfer_list, &fh->xfer_list);
     else
         INIT_LIST_HEAD(&data->xfer_list);
 
     list_add_tail(&data->list, &adap->transmit_queue);
     adap->transmit_queue_sz++;
     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;
 
     /*
      * Release the lock and wait, retake the lock afterwards.
      */
     mutex_unlock(&adap->lock);
     wait_for_completion_killable(&data->c);
     if (!data->completed)
         cancel_delayed_work_sync(&data->work);
     mutex_lock(&adap->lock);
 
     /* Cancel the transmit if it was interrupted */
     if (!data->completed) {
         if (data->msg.tx_status & CEC_TX_STATUS_OK)
             cec_data_cancel(data, CEC_TX_STATUS_OK, CEC_RX_STATUS_ABORTED);
         else
             cec_data_cancel(data, CEC_TX_STATUS_ABORTED, 0);
     }
 
     /* The transmit completed (possibly with an error) */
     *msg = data->msg;
     if (WARN_ON(!list_empty(&data->list)))
         list_del(&data->list);
     if (WARN_ON(!list_empty(&data->xfer_list)))
         list_del(&data->xfer_list);
     kfree(data);
     return 0;
 }
 
 /* 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);
 
 #define DIRECTED    0x80
 #define BCAST1_4    0x40
 #define BCAST2_0    0x20    /* broadcast only allowed for >= 2.0 */
 #define BCAST       (BCAST1_4 | BCAST2_0)
 #define BOTH        (BCAST | DIRECTED)
 
 /*
  * Specify minimum length and whether the message is directed, broadcast
  * or both. Messages that do not match the criteria are ignored as per
  * the CEC specification.
  */
 static const u8 cec_msg_size[256] = {
     [CEC_MSG_ACTIVE_SOURCE] = 4 | BCAST,
     [CEC_MSG_IMAGE_VIEW_ON] = 2 | DIRECTED,
     [CEC_MSG_TEXT_VIEW_ON] = 2 | DIRECTED,
     [CEC_MSG_INACTIVE_SOURCE] = 4 | DIRECTED,
     [CEC_MSG_REQUEST_ACTIVE_SOURCE] = 2 | BCAST,
     [CEC_MSG_ROUTING_CHANGE] = 6 | BCAST,
     [CEC_MSG_ROUTING_INFORMATION] = 4 | BCAST,
     [CEC_MSG_SET_STREAM_PATH] = 4 | BCAST,
     [CEC_MSG_STANDBY] = 2 | BOTH,
     [CEC_MSG_RECORD_OFF] = 2 | DIRECTED,
     [CEC_MSG_RECORD_ON] = 3 | DIRECTED,
     [CEC_MSG_RECORD_STATUS] = 3 | DIRECTED,
     [CEC_MSG_RECORD_TV_SCREEN] = 2 | DIRECTED,
     [CEC_MSG_CLEAR_ANALOGUE_TIMER] = 13 | DIRECTED,
     [CEC_MSG_CLEAR_DIGITAL_TIMER] = 16 | DIRECTED,
     [CEC_MSG_CLEAR_EXT_TIMER] = 13 | DIRECTED,
     [CEC_MSG_SET_ANALOGUE_TIMER] = 13 | DIRECTED,
     [CEC_MSG_SET_DIGITAL_TIMER] = 16 | DIRECTED,
     [CEC_MSG_SET_EXT_TIMER] = 13 | DIRECTED,
     [CEC_MSG_SET_TIMER_PROGRAM_TITLE] = 2 | DIRECTED,
     [CEC_MSG_TIMER_CLEARED_STATUS] = 3 | DIRECTED,
     [CEC_MSG_TIMER_STATUS] = 3 | DIRECTED,
     [CEC_MSG_CEC_VERSION] = 3 | DIRECTED,
     [CEC_MSG_GET_CEC_VERSION] = 2 | DIRECTED,
     [CEC_MSG_GIVE_PHYSICAL_ADDR] = 2 | DIRECTED,
     [CEC_MSG_GET_MENU_LANGUAGE] = 2 | DIRECTED,
     [CEC_MSG_REPORT_PHYSICAL_ADDR] = 5 | BCAST,
     [CEC_MSG_SET_MENU_LANGUAGE] = 5 | BCAST,
     [CEC_MSG_REPORT_FEATURES] = 6 | BCAST,
     [CEC_MSG_GIVE_FEATURES] = 2 | DIRECTED,
     [CEC_MSG_DECK_CONTROL] = 3 | DIRECTED,
     [CEC_MSG_DECK_STATUS] = 3 | DIRECTED,
     [CEC_MSG_GIVE_DECK_STATUS] = 3 | DIRECTED,
     [CEC_MSG_PLAY] = 3 | DIRECTED,
     [CEC_MSG_GIVE_TUNER_DEVICE_STATUS] = 3 | DIRECTED,
     [CEC_MSG_SELECT_ANALOGUE_SERVICE] = 6 | DIRECTED,
     [CEC_MSG_SELECT_DIGITAL_SERVICE] = 9 | DIRECTED,
     [CEC_MSG_TUNER_DEVICE_STATUS] = 7 | DIRECTED,
     [CEC_MSG_TUNER_STEP_DECREMENT] = 2 | DIRECTED,
     [CEC_MSG_TUNER_STEP_INCREMENT] = 2 | DIRECTED,
     [CEC_MSG_DEVICE_VENDOR_ID] = 5 | BCAST,
     [CEC_MSG_GIVE_DEVICE_VENDOR_ID] = 2 | DIRECTED,
     [CEC_MSG_VENDOR_COMMAND] = 2 | DIRECTED,
     [CEC_MSG_VENDOR_COMMAND_WITH_ID] = 5 | BOTH,
     [CEC_MSG_VENDOR_REMOTE_BUTTON_DOWN] = 2 | BOTH,
     [CEC_MSG_VENDOR_REMOTE_BUTTON_UP] = 2 | BOTH,
     [CEC_MSG_SET_OSD_STRING] = 3 | DIRECTED,
     [CEC_MSG_GIVE_OSD_NAME] = 2 | DIRECTED,
     [CEC_MSG_SET_OSD_NAME] = 2 | DIRECTED,
     [CEC_MSG_MENU_REQUEST] = 3 | DIRECTED,
     [CEC_MSG_MENU_STATUS] = 3 | DIRECTED,
     [CEC_MSG_USER_CONTROL_PRESSED] = 3 | DIRECTED,
     [CEC_MSG_USER_CONTROL_RELEASED] = 2 | DIRECTED,
     [CEC_MSG_GIVE_DEVICE_POWER_STATUS] = 2 | DIRECTED,
     [CEC_MSG_REPORT_POWER_STATUS] = 3 | DIRECTED | BCAST2_0,
     [CEC_MSG_FEATURE_ABORT] = 4 | DIRECTED,
     [CEC_MSG_ABORT] = 2 | DIRECTED,
     [CEC_MSG_GIVE_AUDIO_STATUS] = 2 | DIRECTED,
     [CEC_MSG_GIVE_SYSTEM_AUDIO_MODE_STATUS] = 2 | DIRECTED,
     [CEC_MSG_REPORT_AUDIO_STATUS] = 3 | DIRECTED,
     [CEC_MSG_REPORT_SHORT_AUDIO_DESCRIPTOR] = 2 | DIRECTED,
     [CEC_MSG_REQUEST_SHORT_AUDIO_DESCRIPTOR] = 2 | DIRECTED,
     [CEC_MSG_SET_SYSTEM_AUDIO_MODE] = 3 | BOTH,
     [CEC_MSG_SYSTEM_AUDIO_MODE_REQUEST] = 2 | DIRECTED,
     [CEC_MSG_SYSTEM_AUDIO_MODE_STATUS] = 3 | DIRECTED,
     [CEC_MSG_SET_AUDIO_RATE] = 3 | DIRECTED,
     [CEC_MSG_INITIATE_ARC] = 2 | DIRECTED,
     [CEC_MSG_REPORT_ARC_INITIATED] = 2 | DIRECTED,
     [CEC_MSG_REPORT_ARC_TERMINATED] = 2 | DIRECTED,
     [CEC_MSG_REQUEST_ARC_INITIATION] = 2 | DIRECTED,
     [CEC_MSG_REQUEST_ARC_TERMINATION] = 2 | DIRECTED,
     [CEC_MSG_TERMINATE_ARC] = 2 | DIRECTED,
     [CEC_MSG_REQUEST_CURRENT_LATENCY] = 4 | BCAST,
     [CEC_MSG_REPORT_CURRENT_LATENCY] = 6 | BCAST,
     [CEC_MSG_CDC_MESSAGE] = 2 | BCAST,
 };
 
 /* Called by the CEC adapter if a message is received */
 void cec_received_msg_ts(struct cec_adapter *adap,
              struct cec_msg *msg, ktime_t ts)
 {
     struct cec_data *data;
     u8 msg_init = cec_msg_initiator(msg);
     u8 msg_dest = cec_msg_destination(msg);
     u8 cmd = msg->msg[1];
     bool is_reply = false;
     bool valid_la = true;
     u8 min_len = 0;
 
     if (WARN_ON(!msg->len || msg->len > CEC_MAX_MSG_SIZE))
         return;
 
     if (adap->devnode.unregistered)
         return;
 
     /*
      * Some CEC adapters will receive the messages that they transmitted.
      * This test filters out those messages by checking if we are the
      * initiator, and just returning in that case.
      *
      * Note that this won't work if this is an Unregistered device.
      *
      * It is bad practice if the hardware receives the message that it
      * transmitted and luckily most CEC adapters behave correctly in this
      * respect.
      */
     if (msg_init != CEC_LOG_ADDR_UNREGISTERED &&
         cec_has_log_addr(adap, msg_init))
         return;
 
     msg->rx_ts = ktime_to_ns(ts);
     msg->rx_status = CEC_RX_STATUS_OK;
     msg->sequence = msg->reply = msg->timeout = 0;
     msg->tx_status = 0;
     msg->tx_ts = 0;
     msg->tx_arb_lost_cnt = 0;
     msg->tx_nack_cnt = 0;
     msg->tx_low_drive_cnt = 0;
     msg->tx_error_cnt = 0;
     msg->flags = 0;
     memset(msg->msg + msg->len, 0, sizeof(msg->msg) - msg->len);
 
     mutex_lock(&adap->lock);
     dprintk(2, "%s: %*ph\n", __func__, msg->len, msg->msg);
 
     adap->last_initiator = 0xff;
 
     /* 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);
 
     /*
      * Check if the length is not too short or if the message is a
      * broadcast message where a directed message was expected or
      * vice versa. If so, then the message has to be ignored (according
      * to section CEC 7.3 and CEC 12.2).
      */
     if (valid_la && msg->len > 1 && cec_msg_size[cmd]) {
         u8 dir_fl = cec_msg_size[cmd] & BOTH;
 
         min_len = cec_msg_size[cmd] & 0x1f;
         if (msg->len < min_len)
             valid_la = false;
         else if (!cec_msg_is_broadcast(msg) && !(dir_fl & DIRECTED))
             valid_la = false;
         else if (cec_msg_is_broadcast(msg) && !(dir_fl & BCAST))
             valid_la = false;
         else if (cec_msg_is_broadcast(msg) &&
              adap->log_addrs.cec_version < CEC_OP_CEC_VERSION_2_0 &&
              !(dir_fl & BCAST1_4))
             valid_la = false;
     }
     if (valid_la && min_len) {
         /* These messages have special length requirements */
         switch (cmd) {
         case CEC_MSG_TIMER_STATUS:
             if (msg->msg[2] & 0x10) {
                 switch (msg->msg[2] & 0xf) {
                 case CEC_OP_PROG_INFO_NOT_ENOUGH_SPACE:
                 case CEC_OP_PROG_INFO_MIGHT_NOT_BE_ENOUGH_SPACE:
                     if (msg->len < 5)
                         valid_la = false;
                     break;
                 }
             } else if ((msg->msg[2] & 0xf) == CEC_OP_PROG_ERROR_DUPLICATE) {
                 if (msg->len < 5)
                     valid_la = false;
             }
             break;
         case CEC_MSG_RECORD_ON:
             switch (msg->msg[2]) {
             case CEC_OP_RECORD_SRC_OWN:
                 break;
             case CEC_OP_RECORD_SRC_DIGITAL:
                 if (msg->len < 10)
                     valid_la = false;
                 break;
             case CEC_OP_RECORD_SRC_ANALOG:
                 if (msg->len < 7)
                     valid_la = false;
                 break;
             case CEC_OP_RECORD_SRC_EXT_PLUG:
                 if (msg->len < 4)
                     valid_la = false;
                 break;
             case CEC_OP_RECORD_SRC_EXT_PHYS_ADDR:
                 if (msg->len < 5)
                     valid_la = false;
                 break;
             }
             break;
         }
     }
 
     /* It's a valid message and not a poll or CDC message */
     if (valid_la && msg->len > 1 && cmd != CEC_MSG_CDC_MESSAGE) {
         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;
 
             /*
              * The *only* CEC message that has two possible replies
              * is CEC_MSG_INITIATE_ARC.
              * In this case allow either of the two replies.
              */
             if (!abort && dst->msg[1] == CEC_MSG_INITIATE_ARC &&
                 (cmd == CEC_MSG_REPORT_ARC_INITIATED ||
                  cmd == CEC_MSG_REPORT_ARC_TERMINATED) &&
                 (dst->reply == CEC_MSG_REPORT_ARC_INITIATED ||
                  dst->reply == CEC_MSG_REPORT_ARC_TERMINATED))
                 dst->reply = cmd;
 
             /* 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 */
             memcpy(dst->msg, msg->msg, msg->len);
             dst->len = msg->len;
             dst->rx_ts = msg->rx_ts;
             dst->rx_status = msg->rx_status;
             if (abort)
                 dst->rx_status |= CEC_RX_STATUS_FEATURE_ABORT;
             msg->flags = dst->flags;
             msg->sequence = dst->sequence;
             /* 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);
                 cancel_delayed_work_sync(&data->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;
 
     if (adap->log_addrs.log_addr_mask == 0)
         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_ts);
 
 /* 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 = { };
     const unsigned int max_retries = 2;
     unsigned int i;
     int err;
 
     if (cec_has_log_addr(adap, log_addr))
         return 0;
 
     /* Send poll message */
     msg.len = 1;
     msg.msg[0] = (log_addr << 4) | log_addr;
 
     for (i = 0; i < max_retries; i++) {
         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->phys_addr == CEC_PHYS_ADDR_INVALID)
             return -EINTR;
 
         /* Also bail out if the PA changed while configuring. */
         if (adap->must_reconfigure)
             return -EINTR;
 
         if (err)
             return err;
 
         /*
          * The message was aborted or timed out due to a disconnect or
          * unconfigure, just bail out.
          */
         if (msg.tx_status &
             (CEC_TX_STATUS_ABORTED | CEC_TX_STATUS_TIMEOUT))
             return -EINTR;
         if (msg.tx_status & CEC_TX_STATUS_OK)
             return 0;
         if (msg.tx_status & CEC_TX_STATUS_NACK)
             break;
         /*
          * Retry up to max_retries times if the message was neither
          * OKed or NACKed. This can happen due to e.g. a Lost
          * Arbitration condition.
          */
     }
 
     /*
      * If we are unable to get an OK or a NACK after max_retries attempts
      * (and note that each attempt already consists of four polls), then
      * we assume that something is really weird and that it is not a
      * good idea to try and claim this logical address.
      */
     if (i == max_retries) {
         dprintk(0, "polling for LA %u failed with tx_status=0x%04x\n",
             log_addr, msg.tx_status);
         return 0;
     }
 
     /*
      * Message not acknowledged, so this logical
      * address is free to use.
      */
     err = call_op(adap, adap_log_addr, log_addr);
     if (err)
         return err;
 
     las->log_addr[idx] = log_addr;
     las->log_addr_mask |= 1 << log_addr;
     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)
 {
     if (!adap->needs_hpd || adap->phys_addr != CEC_PHYS_ADDR_INVALID)
         WARN_ON(call_op(adap, adap_log_addr, CEC_LOG_ADDR_INVALID));
     adap->log_addrs.log_addr_mask = 0;
     adap->is_configured = false;
     cec_flush(adap);
     wake_up_interruptible(&adap->kthread_waitq);
     cec_post_state_event(adap);
     call_void_op(adap, adap_configured, false);
 }
 
 /*
  * 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;
 
 reconfigure:
     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 ||
             !((1 << last_la) & type2mask[type]))
             last_la = la_list[0];
 
         err = cec_config_log_addr(adap, i, last_la);
 
         if (adap->must_reconfigure) {
             adap->must_reconfigure = false;
             las->log_addr_mask = 0;
             goto reconfigure;
         }
 
         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);
     }
 
     if (adap->log_addrs.log_addr_mask == 0 &&
         !(las->flags & CEC_LOG_ADDRS_FL_ALLOW_UNREG_FALLBACK))
         goto unconfigure;
 
 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];
         for (i = 1; i < las->num_log_addrs; i++)
             las->log_addr[i] = CEC_LOG_ADDR_INVALID;
     }
     for (i = las->num_log_addrs; i < CEC_MAX_LOG_ADDRS; i++)
         las->log_addr[i] = CEC_LOG_ADDR_INVALID;
     adap->is_configured = true;
     adap->is_configuring = false;
     adap->must_reconfigure = false;
     cec_post_state_event(adap);
 
     /*
      * Now post the Report Features and Report Physical Address broadcast
      * messages. Note that these are non-blocking transmits, meaning that
      * they are just queued up and once adap->lock is unlocked the main
      * thread will kick in and start transmitting these.
      *
      * If after this function is done (but before one or more of these
      * messages are actually transmitted) the CEC adapter is unconfigured,
      * then any remaining messages will be dropped by the main thread.
      */
     for (i = 0; i < las->num_log_addrs; i++) {
         struct cec_msg msg = {};
 
         if (las->log_addr[i] == CEC_LOG_ADDR_INVALID ||
             (las->flags & CEC_LOG_ADDRS_FL_CDC_ONLY))
             continue;
 
         msg.msg[0] = (las->log_addr[i] << 4) | 0x0f;
 
         /* Report Features must come first according to CEC 2.0 */
         if (las->log_addr[i] != CEC_LOG_ADDR_UNREGISTERED &&
             adap->log_addrs.cec_version >= CEC_OP_CEC_VERSION_2_0) {
             cec_fill_msg_report_features(adap, &msg, i);
             cec_transmit_msg_fh(adap, &msg, NULL, false);
         }
 
         /* Report Physical Address */
         cec_msg_report_physical_addr(&msg, adap->phys_addr,
                          las->primary_device_type[i]);
         dprintk(1, "config: la %d pa %x.%x.%x.%x\n",
             las->log_addr[i],
             cec_phys_addr_exp(adap->phys_addr));
         cec_transmit_msg_fh(adap, &msg, NULL, false);
 
         /* Report Vendor ID */
         if (adap->log_addrs.vendor_id != CEC_VENDOR_ID_NONE) {
             cec_msg_device_vendor_id(&msg,
                          adap->log_addrs.vendor_id);
             cec_transmit_msg_fh(adap, &msg, NULL, false);
         }
     }
     adap->kthread_config = NULL;
     complete(&adap->config_completion);
     mutex_unlock(&adap->lock);
     call_void_op(adap, adap_configured, true);
     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->is_configuring = false;
     adap->must_reconfigure = false;
     adap->kthread_config = NULL;
     complete(&adap->config_completion);
     mutex_unlock(&adap->lock);
     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;
         adap->is_configuring = false;
     } else if (block) {
         mutex_unlock(&adap->lock);
         wait_for_completion(&adap->config_completion);
         mutex_lock(&adap->lock);
     }
 }
 
 /*
  * Helper function to enable/disable the CEC adapter.
  *
  * This function is called with adap->lock held.
  */
 static int cec_adap_enable(struct cec_adapter *adap)
 {
     bool enable;
     int ret = 0;
 
     enable = adap->monitor_all_cnt || adap->monitor_pin_cnt ||
          adap->log_addrs.num_log_addrs;
     if (adap->needs_hpd)
         enable = enable && adap->phys_addr != CEC_PHYS_ADDR_INVALID;
 
     if (enable == adap->is_enabled)
         return 0;
 
     /* serialize adap_enable */
     mutex_lock(&adap->devnode.lock);
     if (enable) {
         adap->last_initiator = 0xff;
         adap->transmit_in_progress = false;
         ret = adap->ops->adap_enable(adap, true);
         if (!ret) {
             /*
              * Enable monitor-all/pin modes if needed. We warn, but
              * continue if this fails as this is not a critical error.
              */
             if (adap->monitor_all_cnt)
                 WARN_ON(call_op(adap, adap_monitor_all_enable, true));
             if (adap->monitor_pin_cnt)
                 WARN_ON(call_op(adap, adap_monitor_pin_enable, true));
         }
     } else {
         /* Disable monitor-all/pin modes if needed (needs_hpd == 1) */
         if (adap->monitor_all_cnt)
             WARN_ON(call_op(adap, adap_monitor_all_enable, false));
         if (adap->monitor_pin_cnt)
             WARN_ON(call_op(adap, adap_monitor_pin_enable, false));
         WARN_ON(adap->ops->adap_enable(adap, false));
         adap->last_initiator = 0xff;
         adap->transmit_in_progress = false;
         adap->transmit_in_progress_aborted = false;
         if (adap->transmitting)
             cec_data_cancel(adap->transmitting, CEC_TX_STATUS_ABORTED, 0);
     }
     if (!ret)
         adap->is_enabled = enable;
     wake_up_interruptible(&adap->kthread_waitq);
     mutex_unlock(&adap->devnode.lock);
     return ret;
 }
 
 /* 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)
 {
     bool becomes_invalid = phys_addr == CEC_PHYS_ADDR_INVALID;
     bool is_invalid = adap->phys_addr == CEC_PHYS_ADDR_INVALID;
 
     if (phys_addr == adap->phys_addr)
         return;
     if (!becomes_invalid && adap->devnode.unregistered)
         return;
 
     dprintk(1, "new physical address %x.%x.%x.%x\n",
         cec_phys_addr_exp(phys_addr));
     if (becomes_invalid || !is_invalid) {
         adap->phys_addr = CEC_PHYS_ADDR_INVALID;
         cec_post_state_event(adap);
         cec_adap_unconfigure(adap);
         if (becomes_invalid) {
             cec_adap_enable(adap);
             return;
         }
     }
 
     adap->phys_addr = phys_addr;
     if (is_invalid)
         cec_adap_enable(adap);
 
     cec_post_state_event(adap);
     if (!adap->log_addrs.num_log_addrs)
         return;
     if (adap->is_configuring)
         adap->must_reconfigure = true;
     else
         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;
 
     mutex_lock(&adap->lock);
     __cec_s_phys_addr(adap, phys_addr, block);
     mutex_unlock(&adap->lock);
 }
 EXPORT_SYMBOL_GPL(cec_s_phys_addr);
 
 void cec_s_phys_addr_from_edid(struct cec_adapter *adap,
                    const struct edid *edid)
 {
     u16 pa = CEC_PHYS_ADDR_INVALID;
 
     if (edid && edid->extensions)
         pa = cec_get_edid_phys_addr((const u8 *)edid,
                 EDID_LENGTH * (edid->extensions + 1), NULL);
     cec_s_phys_addr(adap, pa, false);
 }
 EXPORT_SYMBOL_GPL(cec_s_phys_addr_from_edid);
 
 void cec_s_conn_info(struct cec_adapter *adap,
              const struct cec_connector_info *conn_info)
 {
     if (IS_ERR_OR_NULL(adap))
         return;
 
     if (!(adap->capabilities & CEC_CAP_CONNECTOR_INFO))
         return;
 
     mutex_lock(&adap->lock);
     if (conn_info)
         adap->conn_info = *conn_info;
     else
         memset(&adap->conn_info, 0, sizeof(adap->conn_info));
     cec_post_state_event(adap);
     mutex_unlock(&adap->lock);
 }
 EXPORT_SYMBOL_GPL(cec_s_conn_info);
 
 /*
  * 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 err;
     int i;
 
     if (adap->devnode.unregistered)
         return -ENODEV;
 
     if (!log_addrs || log_addrs->num_log_addrs == 0) {
         if (!adap->log_addrs.num_log_addrs)
             return 0;
         if (adap->is_configuring || adap->is_configured)
             cec_adap_unconfigure(adap);
         adap->log_addrs.num_log_addrs = 0;
         for (i = 0; i < CEC_MAX_LOG_ADDRS; i++)
             adap->log_addrs.log_addr[i] = CEC_LOG_ADDR_INVALID;
         adap->log_addrs.osd_name[0] = '\0';
         adap->log_addrs.vendor_id = CEC_VENDOR_ID_NONE;
         adap->log_addrs.cec_version = CEC_OP_CEC_VERSION_2_0;
         cec_adap_enable(adap);
         return 0;
     }
 
     if (log_addrs->flags & CEC_LOG_ADDRS_FL_CDC_ONLY) {
         /*
          * Sanitize log_addrs fields if a CDC-Only device is
          * requested.
          */
         log_addrs->num_log_addrs = 1;
         log_addrs->osd_name[0] = '\0';
         log_addrs->vendor_id = CEC_VENDOR_ID_NONE;
         log_addrs->log_addr_type[0] = CEC_LOG_ADDR_TYPE_UNREGISTERED;
         /*
          * This is just an internal convention since a CDC-Only device
          * doesn't have to be a switch. But switches already use
          * unregistered, so it makes some kind of sense to pick this
          * as the primary device. Since a CDC-Only device never sends
          * any 'normal' CEC messages this primary device type is never
          * sent over the CEC bus.
          */
         log_addrs->primary_device_type[0] = CEC_OP_PRIM_DEVTYPE_SWITCH;
         log_addrs->all_device_types[0] = 0;
         log_addrs->features[0][0] = 0;
         log_addrs->features[0][1] = 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) {
         dprintk(1, "invalid vendor ID\n");
         return -EINVAL;
     }
 
     if (log_addrs->cec_version != CEC_OP_CEC_VERSION_1_4 &&
         log_addrs->cec_version != CEC_OP_CEC_VERSION_2_0) {
         dprintk(1, "invalid CEC version\n");
         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;
             }
 
     for (i = 0; i < log_addrs->num_log_addrs; i++) {
         const u8 feature_sz = ARRAY_SIZE(log_addrs->features[0]);
         u8 *features = log_addrs->features[i];
         bool op_is_dev_features = false;
         unsigned int j;
 
         log_addrs->log_addr[i] = CEC_LOG_ADDR_INVALID;
         if (log_addrs->log_addr_type[i] > CEC_LOG_ADDR_TYPE_UNREGISTERED) {
             dprintk(1, "unknown logical address type\n");
             return -EINVAL;
         }
         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;
         }
         for (j = 0; j < feature_sz; j++) {
             if ((features[j] & 0x80) == 0) {
                 if (op_is_dev_features)
                     break;
                 op_is_dev_features = true;
             }
         }
         if (!op_is_dev_features || j == feature_sz) {
             dprintk(1, "malformed features\n");
             return -EINVAL;
         }
         /* Zero unused part of the feature array */
         memset(features + j + 1, 0, feature_sz - j - 1);
     }
 
     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;
             }
         }
     }
 
     /* Zero unused LAs */
     for (i = log_addrs->num_log_addrs; i < CEC_MAX_LOG_ADDRS; i++) {
         log_addrs->primary_device_type[i] = 0;
         log_addrs->log_addr_type[i] = 0;
         log_addrs->all_device_types[i] = 0;
         memset(log_addrs->features[i], 0,
                sizeof(log_addrs->features[i]));
     }
 
     log_addrs->log_addr_mask = adap->log_addrs.log_addr_mask;
     adap->log_addrs = *log_addrs;
     err = cec_adap_enable(adap);
     if (!err && adap->phys_addr != CEC_PHYS_ADDR_INVALID)
         cec_claim_log_addrs(adap, block);
     return err;
 }
 
 int cec_s_log_addrs(struct cec_adapter *adap,
             struct cec_log_addrs *log_addrs, bool block)
 {
     int err;
 
     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 */
 
 /* Fill in the Report Features message */
 static void cec_fill_msg_report_features(struct cec_adapter *adap,
                      struct cec_msg *msg,
                      unsigned int la_idx)
 {
     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;
 
     /* 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;
         }
     }
 }
 
 /* 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;
     /* Don't Feature Abort messages from 'Unregistered' */
     if (cec_msg_initiator(msg) == CEC_LOG_ADDR_UNREGISTERED)
         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 from_unregistered = init_laddr == 0xf;
     struct cec_msg tx_cec_msg = { };
 
     dprintk(2, "%s: %*ph\n", __func__, msg->len, msg->msg);
 
     /* If this is a CDC-Only device, then ignore any non-CDC messages */
     if (cec_is_cdc_only(&adap->log_addrs) &&
         msg->msg[1] != CEC_MSG_CDC_MESSAGE)
         return 0;
 
     /* Allow drivers to process the message first */
     if (adap->ops->received && !adap->devnode.unregistered &&
         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_ABORT:
     case CEC_MSG_GIVE_DEVICE_POWER_STATUS:
     case CEC_MSG_GIVE_OSD_NAME:
         /*
          * These messages reply with a directed message, so ignore if
          * the initiator is Unregistered.
          */
         if (!adap->passthrough && from_unregistered)
             return 0;
         fallthrough;
     case CEC_MSG_GIVE_DEVICE_VENDOR_ID:
     case CEC_MSG_GIVE_FEATURES:
     case CEC_MSG_GIVE_PHYSICAL_ADDR:
         /*
          * Skip processing these messages if the passthrough mode
          * is on.
          */
         if (adap->passthrough)
             goto skip_processing;
         /* Ignore if addressing is wrong */
         if (is_broadcast)
             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: {
         u16 pa = (msg->msg[2] << 8) | msg->msg[3];
 
         dprintk(1, "reported physical address %x.%x.%x.%x for logical address %d\n",
             cec_phys_addr_exp(pa), init_laddr);
         break;
     }
 
     case CEC_MSG_USER_CONTROL_PRESSED:
         if (!(adap->capabilities & CEC_CAP_RC) ||
             !(adap->log_addrs.flags & CEC_LOG_ADDRS_FL_ALLOW_RC_PASSTHRU))
             break;
 
 #ifdef CONFIG_MEDIA_CEC_RC
         switch (msg->msg[2]) {
         /*
          * Play function, this message can have variable length
          * depending on the specific play function that is used.
          */
         case CEC_OP_UI_CMD_PLAY_FUNCTION:
             if (msg->len == 2)
                 rc_keydown(adap->rc, RC_PROTO_CEC,
                        msg->msg[2], 0);
             else
                 rc_keydown(adap->rc, RC_PROTO_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 CEC_OP_UI_CMD_SELECT_BROADCAST_TYPE:
         case CEC_OP_UI_CMD_SELECT_SOUND_PRESENTATION:
         case CEC_OP_UI_CMD_TUNE_FUNCTION:
         case CEC_OP_UI_CMD_SELECT_MEDIA_FUNCTION:
         case CEC_OP_UI_CMD_SELECT_AV_INPUT_FUNCTION:
         case CEC_OP_UI_CMD_SELECT_AUDIO_INPUT_FUNCTION:
             break;
         default:
             rc_keydown(adap->rc, RC_PROTO_CEC, msg->msg[2], 0);
             break;
         }
 #endif
         break;
 
     case CEC_MSG_USER_CONTROL_RELEASED:
         if (!(adap->capabilities & CEC_CAP_RC) ||
             !(adap->log_addrs.flags & CEC_LOG_ADDRS_FL_ALLOW_RC_PASSTHRU))
             break;
 #ifdef CONFIG_MEDIA_CEC_RC
         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_feature_abort(adap, msg);
         cec_fill_msg_report_features(adap, &tx_cec_msg, la_idx);
         return cec_transmit_msg(adap, &tx_cec_msg, false);
 
     default:
         /*
          * Unprocessed messages are aborted if userspace isn't doing
          * any processing either.
          */
         if (!is_broadcast && !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, unless otherwise specified */
     if (is_reply && !(msg->flags & CEC_MSG_FL_REPLY_TO_FOLLOWERS))
         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;
 
     if (adap->monitor_all_cnt++)
         return 0;
 
     ret = cec_adap_enable(adap);
     if (ret)
         adap->monitor_all_cnt--;
     return ret;
 }
 
 void cec_monitor_all_cnt_dec(struct cec_adapter *adap)
 {
     if (WARN_ON(!adap->monitor_all_cnt))
         return;
     if (--adap->monitor_all_cnt)
         return;
     WARN_ON(call_op(adap, adap_monitor_all_enable, false));
     cec_adap_enable(adap);
 }
 
 /*
  * Helper functions to keep track of the 'monitor pin' use count.
  *
  * These functions are called with adap->lock held.
  */
 int cec_monitor_pin_cnt_inc(struct cec_adapter *adap)
 {
     int ret;
 
     if (adap->monitor_pin_cnt++)
         return 0;
 
     ret = cec_adap_enable(adap);
     if (ret)
         adap->monitor_pin_cnt--;
     return ret;
 }
 
 void cec_monitor_pin_cnt_dec(struct cec_adapter *adap)
 {
     if (WARN_ON(!adap->monitor_pin_cnt))
         return;
     if (--adap->monitor_pin_cnt)
         return;
     WARN_ON(call_op(adap, adap_monitor_pin_enable, false));
     cec_adap_enable(adap);
 }
 
 #ifdef CONFIG_DEBUG_FS
 /*
  * 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, "enabled: %d\n", adap->is_enabled);
     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);
     if (adap->monitor_pin_cnt)
         seq_printf(file, "file handles in Monitor Pin mode: %u\n",
                adap->monitor_pin_cnt);
     if (adap->tx_timeouts) {
         seq_printf(file, "transmit timeouts: %u\n",
                adap->tx_timeouts);
         adap->tx_timeouts = 0;
     }
     data = adap->transmitting;
     if (data)
         seq_printf(file, "transmitting message: %*ph (reply: %02x, timeout: %ums)\n",
                data->msg.len, data->msg.msg, data->msg.reply,
                data->msg.timeout);
     seq_printf(file, "pending transmits: %u\n", adap->transmit_queue_sz);
     list_for_each_entry(data, &adap->transmit_queue, list) {
         seq_printf(file, "queued tx message: %*ph (reply: %02x, timeout: %ums)\n",
                data->msg.len, data->msg.msg, data->msg.reply,
                data->msg.timeout);
     }
     list_for_each_entry(data, &adap->wait_queue, list) {
         seq_printf(file, "message waiting for reply: %*ph (reply: %02x, timeout: %ums)\n",
                data->msg.len, data->msg.msg, data->msg.reply,
                data->msg.timeout);
     }
 
     call_void_op(adap, adap_status, file);
     mutex_unlock(&adap->lock);
     return 0;
 }
 #endif

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