Adding upstream version 6.1.76.upstream/6.1.76upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

9 files changed, 5738 insertions, 0 deletions

diff --git a/drivers/media/cec/core/Makefile b/drivers/media/cec/core/Makefile
new file mode 100644
index 000000000..ad8677d8c
--- /dev/null
+++ b/drivers/media/cec/core/Makefile
@@ -0,0 +1,16 @@
+# SPDX-License-Identifier: GPL-2.0
+cec-objs := cec-core.o cec-adap.o cec-api.o
+
+ifeq ($(CONFIG_CEC_NOTIFIER),y)
+  cec-objs += cec-notifier.o
+endif
+
+ifeq ($(CONFIG_CEC_PIN),y)
+  cec-objs += cec-pin.o
+endif
+
+ifeq ($(CONFIG_CEC_PIN_ERROR_INJ),y)
+  cec-objs += cec-pin-error-inj.o
+endif
+
+obj-$(CONFIG_CEC_CORE) += cec.o
diff --git a/drivers/media/cec/core/cec-adap.c b/drivers/media/cec/core/cec-adap.c
new file mode 100644
index 000000000..4bc2a7050
--- /dev/null
+++ b/drivers/media/cec/core/cec-adap.c
@@ -0,0 +1,2286 @@
+// 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 react to a canceled transmit */
+		call_void_op(adap, adap_nb_transmit_canceled, &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_SET_AUDIO_VOLUME_LEVEL] = 3 | DIRECTED,
+	[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);
+
+	if (!adap->transmit_in_progress)
+		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_unconfigured);
+}
+
+/*
+ * 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, configured);
+	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.
+ */
+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 (adap->devnode.unregistered)
+		enable = false;
+
+	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
diff --git a/drivers/media/cec/core/cec-api.c b/drivers/media/cec/core/cec-api.c
new file mode 100644
index 000000000..67dc79ef1
--- /dev/null
+++ b/drivers/media/cec/core/cec-api.c
@@ -0,0 +1,699 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * cec-api.c - HDMI Consumer Electronics Control framework - API
+ *
+ * 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 <linux/uaccess.h>
+#include <linux/version.h>
+
+#include <media/cec-pin.h>
+#include "cec-priv.h"
+#include "cec-pin-priv.h"
+
+static inline struct cec_devnode *cec_devnode_data(struct file *filp)
+{
+	struct cec_fh *fh = filp->private_data;
+
+	return &fh->adap->devnode;
+}
+
+/* CEC file operations */
+
+static __poll_t cec_poll(struct file *filp,
+			     struct poll_table_struct *poll)
+{
+	struct cec_fh *fh = filp->private_data;
+	struct cec_adapter *adap = fh->adap;
+	__poll_t res = 0;
+
+	poll_wait(filp, &fh->wait, poll);
+	if (!cec_is_registered(adap))
+		return EPOLLERR | EPOLLHUP | EPOLLPRI;
+	mutex_lock(&adap->lock);
+	if (adap->is_configured &&
+	    adap->transmit_queue_sz < CEC_MAX_MSG_TX_QUEUE_SZ)
+		res |= EPOLLOUT | EPOLLWRNORM;
+	if (fh->queued_msgs)
+		res |= EPOLLIN | EPOLLRDNORM;
+	if (fh->total_queued_events)
+		res |= EPOLLPRI;
+	mutex_unlock(&adap->lock);
+	return res;
+}
+
+static bool cec_is_busy(const struct cec_adapter *adap,
+			const struct cec_fh *fh)
+{
+	bool valid_initiator = adap->cec_initiator && adap->cec_initiator == fh;
+	bool valid_follower = adap->cec_follower && adap->cec_follower == fh;
+
+	/*
+	 * Exclusive initiators and followers can always access the CEC adapter
+	 */
+	if (valid_initiator || valid_follower)
+		return false;
+	/*
+	 * All others can only access the CEC adapter if there is no
+	 * exclusive initiator and they are in INITIATOR mode.
+	 */
+	return adap->cec_initiator ||
+	       fh->mode_initiator == CEC_MODE_NO_INITIATOR;
+}
+
+static long cec_adap_g_caps(struct cec_adapter *adap,
+			    struct cec_caps __user *parg)
+{
+	struct cec_caps caps = {};
+
+	strscpy(caps.driver, adap->devnode.dev.parent->driver->name,
+		sizeof(caps.driver));
+	strscpy(caps.name, adap->name, sizeof(caps.name));
+	caps.available_log_addrs = adap->available_log_addrs;
+	caps.capabilities = adap->capabilities;
+	caps.version = LINUX_VERSION_CODE;
+	if (copy_to_user(parg, &caps, sizeof(caps)))
+		return -EFAULT;
+	return 0;
+}
+
+static long cec_adap_g_phys_addr(struct cec_adapter *adap,
+				 __u16 __user *parg)
+{
+	u16 phys_addr;
+
+	mutex_lock(&adap->lock);
+	phys_addr = adap->phys_addr;
+	mutex_unlock(&adap->lock);
+	if (copy_to_user(parg, &phys_addr, sizeof(phys_addr)))
+		return -EFAULT;
+	return 0;
+}
+
+static int cec_validate_phys_addr(u16 phys_addr)
+{
+	int i;
+
+	if (phys_addr == CEC_PHYS_ADDR_INVALID)
+		return 0;
+	for (i = 0; i < 16; i += 4)
+		if (phys_addr & (0xf << i))
+			break;
+	if (i == 16)
+		return 0;
+	for (i += 4; i < 16; i += 4)
+		if ((phys_addr & (0xf << i)) == 0)
+			return -EINVAL;
+	return 0;
+}
+
+static long cec_adap_s_phys_addr(struct cec_adapter *adap, struct cec_fh *fh,
+				 bool block, __u16 __user *parg)
+{
+	u16 phys_addr;
+	long err;
+
+	if (!(adap->capabilities & CEC_CAP_PHYS_ADDR))
+		return -ENOTTY;
+	if (copy_from_user(&phys_addr, parg, sizeof(phys_addr)))
+		return -EFAULT;
+
+	err = cec_validate_phys_addr(phys_addr);
+	if (err)
+		return err;
+	mutex_lock(&adap->lock);
+	if (cec_is_busy(adap, fh))
+		err = -EBUSY;
+	else
+		__cec_s_phys_addr(adap, phys_addr, block);
+	mutex_unlock(&adap->lock);
+	return err;
+}
+
+static long cec_adap_g_log_addrs(struct cec_adapter *adap,
+				 struct cec_log_addrs __user *parg)
+{
+	struct cec_log_addrs log_addrs;
+
+	mutex_lock(&adap->lock);
+	/*
+	 * We use memcpy here instead of assignment since there is a
+	 * hole at the end of struct cec_log_addrs that an assignment
+	 * might ignore. So when we do copy_to_user() we could leak
+	 * one byte of memory.
+	 */
+	memcpy(&log_addrs, &adap->log_addrs, sizeof(log_addrs));
+	if (!adap->is_configured)
+		memset(log_addrs.log_addr, CEC_LOG_ADDR_INVALID,
+		       sizeof(log_addrs.log_addr));
+	mutex_unlock(&adap->lock);
+
+	if (copy_to_user(parg, &log_addrs, sizeof(log_addrs)))
+		return -EFAULT;
+	return 0;
+}
+
+static long cec_adap_s_log_addrs(struct cec_adapter *adap, struct cec_fh *fh,
+				 bool block, struct cec_log_addrs __user *parg)
+{
+	struct cec_log_addrs log_addrs;
+	long err = -EBUSY;
+
+	if (!(adap->capabilities & CEC_CAP_LOG_ADDRS))
+		return -ENOTTY;
+	if (copy_from_user(&log_addrs, parg, sizeof(log_addrs)))
+		return -EFAULT;
+	log_addrs.flags &= CEC_LOG_ADDRS_FL_ALLOW_UNREG_FALLBACK |
+			   CEC_LOG_ADDRS_FL_ALLOW_RC_PASSTHRU |
+			   CEC_LOG_ADDRS_FL_CDC_ONLY;
+	mutex_lock(&adap->lock);
+	if (!adap->is_configuring &&
+	    (!log_addrs.num_log_addrs || !adap->is_configured) &&
+	    !cec_is_busy(adap, fh)) {
+		err = __cec_s_log_addrs(adap, &log_addrs, block);
+		if (!err)
+			log_addrs = adap->log_addrs;
+	}
+	mutex_unlock(&adap->lock);
+	if (err)
+		return err;
+	if (copy_to_user(parg, &log_addrs, sizeof(log_addrs)))
+		return -EFAULT;
+	return 0;
+}
+
+static long cec_adap_g_connector_info(struct cec_adapter *adap,
+				      struct cec_log_addrs __user *parg)
+{
+	int ret = 0;
+
+	if (!(adap->capabilities & CEC_CAP_CONNECTOR_INFO))
+		return -ENOTTY;
+
+	mutex_lock(&adap->lock);
+	if (copy_to_user(parg, &adap->conn_info, sizeof(adap->conn_info)))
+		ret = -EFAULT;
+	mutex_unlock(&adap->lock);
+	return ret;
+}
+
+static long cec_transmit(struct cec_adapter *adap, struct cec_fh *fh,
+			 bool block, struct cec_msg __user *parg)
+{
+	struct cec_msg msg = {};
+	long err = 0;
+
+	if (!(adap->capabilities & CEC_CAP_TRANSMIT))
+		return -ENOTTY;
+	if (copy_from_user(&msg, parg, sizeof(msg)))
+		return -EFAULT;
+
+	mutex_lock(&adap->lock);
+	if (adap->log_addrs.num_log_addrs == 0)
+		err = -EPERM;
+	else if (adap->is_configuring)
+		err = -ENONET;
+	else if (cec_is_busy(adap, fh))
+		err = -EBUSY;
+	else
+		err = cec_transmit_msg_fh(adap, &msg, fh, block);
+	mutex_unlock(&adap->lock);
+	if (err)
+		return err;
+	if (copy_to_user(parg, &msg, sizeof(msg)))
+		return -EFAULT;
+	return 0;
+}
+
+/* Called by CEC_RECEIVE: wait for a message to arrive */
+static int cec_receive_msg(struct cec_fh *fh, struct cec_msg *msg, bool block)
+{
+	u32 timeout = msg->timeout;
+	int res;
+
+	do {
+		mutex_lock(&fh->lock);
+		/* Are there received messages queued up? */
+		if (fh->queued_msgs) {
+			/* Yes, return the first one */
+			struct cec_msg_entry *entry =
+				list_first_entry(&fh->msgs,
+						 struct cec_msg_entry, list);
+
+			list_del(&entry->list);
+			*msg = entry->msg;
+			kfree(entry);
+			fh->queued_msgs--;
+			mutex_unlock(&fh->lock);
+			/* restore original timeout value */
+			msg->timeout = timeout;
+			return 0;
+		}
+
+		/* No, return EAGAIN in non-blocking mode or wait */
+		mutex_unlock(&fh->lock);
+
+		/* Return when in non-blocking mode */
+		if (!block)
+			return -EAGAIN;
+
+		if (msg->timeout) {
+			/* The user specified a timeout */
+			res = wait_event_interruptible_timeout(fh->wait,
+							       fh->queued_msgs,
+				msecs_to_jiffies(msg->timeout));
+			if (res == 0)
+				res = -ETIMEDOUT;
+			else if (res > 0)
+				res = 0;
+		} else {
+			/* Wait indefinitely */
+			res = wait_event_interruptible(fh->wait,
+						       fh->queued_msgs);
+		}
+		/* Exit on error, otherwise loop to get the new message */
+	} while (!res);
+	return res;
+}
+
+static long cec_receive(struct cec_adapter *adap, struct cec_fh *fh,
+			bool block, struct cec_msg __user *parg)
+{
+	struct cec_msg msg = {};
+	long err;
+
+	if (copy_from_user(&msg, parg, sizeof(msg)))
+		return -EFAULT;
+
+	err = cec_receive_msg(fh, &msg, block);
+	if (err)
+		return err;
+	msg.flags = 0;
+	if (copy_to_user(parg, &msg, sizeof(msg)))
+		return -EFAULT;
+	return 0;
+}
+
+static long cec_dqevent(struct cec_adapter *adap, struct cec_fh *fh,
+			bool block, struct cec_event __user *parg)
+{
+	struct cec_event_entry *ev = NULL;
+	u64 ts = ~0ULL;
+	unsigned int i;
+	unsigned int ev_idx;
+	long err = 0;
+
+	mutex_lock(&fh->lock);
+	while (!fh->total_queued_events && block) {
+		mutex_unlock(&fh->lock);
+		err = wait_event_interruptible(fh->wait,
+					       fh->total_queued_events);
+		if (err)
+			return err;
+		mutex_lock(&fh->lock);
+	}
+
+	/* Find the oldest event */
+	for (i = 0; i < CEC_NUM_EVENTS; i++) {
+		struct cec_event_entry *entry =
+			list_first_entry_or_null(&fh->events[i],
+						 struct cec_event_entry, list);
+
+		if (entry && entry->ev.ts <= ts) {
+			ev = entry;
+			ev_idx = i;
+			ts = ev->ev.ts;
+		}
+	}
+
+	if (!ev) {
+		err = -EAGAIN;
+		goto unlock;
+	}
+	list_del(&ev->list);
+
+	if (copy_to_user(parg, &ev->ev, sizeof(ev->ev)))
+		err = -EFAULT;
+	if (ev_idx >= CEC_NUM_CORE_EVENTS)
+		kfree(ev);
+	fh->queued_events[ev_idx]--;
+	fh->total_queued_events--;
+
+unlock:
+	mutex_unlock(&fh->lock);
+	return err;
+}
+
+static long cec_g_mode(struct cec_adapter *adap, struct cec_fh *fh,
+		       u32 __user *parg)
+{
+	u32 mode = fh->mode_initiator | fh->mode_follower;
+
+	if (copy_to_user(parg, &mode, sizeof(mode)))
+		return -EFAULT;
+	return 0;
+}
+
+static long cec_s_mode(struct cec_adapter *adap, struct cec_fh *fh,
+		       u32 __user *parg)
+{
+	u32 mode;
+	u8 mode_initiator;
+	u8 mode_follower;
+	bool send_pin_event = false;
+	long err = 0;
+
+	if (copy_from_user(&mode, parg, sizeof(mode)))
+		return -EFAULT;
+	if (mode & ~(CEC_MODE_INITIATOR_MSK | CEC_MODE_FOLLOWER_MSK)) {
+		dprintk(1, "%s: invalid mode bits set\n", __func__);
+		return -EINVAL;
+	}
+
+	mode_initiator = mode & CEC_MODE_INITIATOR_MSK;
+	mode_follower = mode & CEC_MODE_FOLLOWER_MSK;
+
+	if (mode_initiator > CEC_MODE_EXCL_INITIATOR ||
+	    mode_follower > CEC_MODE_MONITOR_ALL) {
+		dprintk(1, "%s: unknown mode\n", __func__);
+		return -EINVAL;
+	}
+
+	if (mode_follower == CEC_MODE_MONITOR_ALL &&
+	    !(adap->capabilities & CEC_CAP_MONITOR_ALL)) {
+		dprintk(1, "%s: MONITOR_ALL not supported\n", __func__);
+		return -EINVAL;
+	}
+
+	if (mode_follower == CEC_MODE_MONITOR_PIN &&
+	    !(adap->capabilities & CEC_CAP_MONITOR_PIN)) {
+		dprintk(1, "%s: MONITOR_PIN not supported\n", __func__);
+		return -EINVAL;
+	}
+
+	/* Follower modes should always be able to send CEC messages */
+	if ((mode_initiator == CEC_MODE_NO_INITIATOR ||
+	     !(adap->capabilities & CEC_CAP_TRANSMIT)) &&
+	    mode_follower >= CEC_MODE_FOLLOWER &&
+	    mode_follower <= CEC_MODE_EXCL_FOLLOWER_PASSTHRU) {
+		dprintk(1, "%s: cannot transmit\n", __func__);
+		return -EINVAL;
+	}
+
+	/* Monitor modes require CEC_MODE_NO_INITIATOR */
+	if (mode_initiator && mode_follower >= CEC_MODE_MONITOR_PIN) {
+		dprintk(1, "%s: monitor modes require NO_INITIATOR\n",
+			__func__);
+		return -EINVAL;
+	}
+
+	/* Monitor modes require CAP_NET_ADMIN */
+	if (mode_follower >= CEC_MODE_MONITOR_PIN && !capable(CAP_NET_ADMIN))
+		return -EPERM;
+
+	mutex_lock(&adap->lock);
+	/*
+	 * You can't become exclusive follower if someone else already
+	 * has that job.
+	 */
+	if ((mode_follower == CEC_MODE_EXCL_FOLLOWER ||
+	     mode_follower == CEC_MODE_EXCL_FOLLOWER_PASSTHRU) &&
+	    adap->cec_follower && adap->cec_follower != fh)
+		err = -EBUSY;
+	/*
+	 * You can't become exclusive initiator if someone else already
+	 * has that job.
+	 */
+	if (mode_initiator == CEC_MODE_EXCL_INITIATOR &&
+	    adap->cec_initiator && adap->cec_initiator != fh)
+		err = -EBUSY;
+
+	if (!err) {
+		bool old_mon_all = fh->mode_follower == CEC_MODE_MONITOR_ALL;
+		bool new_mon_all = mode_follower == CEC_MODE_MONITOR_ALL;
+
+		if (old_mon_all != new_mon_all) {
+			if (new_mon_all)
+				err = cec_monitor_all_cnt_inc(adap);
+			else
+				cec_monitor_all_cnt_dec(adap);
+		}
+	}
+
+	if (!err) {
+		bool old_mon_pin = fh->mode_follower == CEC_MODE_MONITOR_PIN;
+		bool new_mon_pin = mode_follower == CEC_MODE_MONITOR_PIN;
+
+		if (old_mon_pin != new_mon_pin) {
+			send_pin_event = new_mon_pin;
+			if (new_mon_pin)
+				err = cec_monitor_pin_cnt_inc(adap);
+			else
+				cec_monitor_pin_cnt_dec(adap);
+		}
+	}
+
+	if (err) {
+		mutex_unlock(&adap->lock);
+		return err;
+	}
+
+	if (fh->mode_follower == CEC_MODE_FOLLOWER)
+		adap->follower_cnt--;
+	if (mode_follower == CEC_MODE_FOLLOWER)
+		adap->follower_cnt++;
+	if (send_pin_event) {
+		struct cec_event ev = {
+			.flags = CEC_EVENT_FL_INITIAL_STATE,
+		};
+
+		ev.event = adap->cec_pin_is_high ? CEC_EVENT_PIN_CEC_HIGH :
+						   CEC_EVENT_PIN_CEC_LOW;
+		cec_queue_event_fh(fh, &ev, 0);
+	}
+	if (mode_follower == CEC_MODE_EXCL_FOLLOWER ||
+	    mode_follower == CEC_MODE_EXCL_FOLLOWER_PASSTHRU) {
+		adap->passthrough =
+			mode_follower == CEC_MODE_EXCL_FOLLOWER_PASSTHRU;
+		adap->cec_follower = fh;
+	} else if (adap->cec_follower == fh) {
+		adap->passthrough = false;
+		adap->cec_follower = NULL;
+	}
+	if (mode_initiator == CEC_MODE_EXCL_INITIATOR)
+		adap->cec_initiator = fh;
+	else if (adap->cec_initiator == fh)
+		adap->cec_initiator = NULL;
+	fh->mode_initiator = mode_initiator;
+	fh->mode_follower = mode_follower;
+	mutex_unlock(&adap->lock);
+	return 0;
+}
+
+static long cec_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
+{
+	struct cec_fh *fh = filp->private_data;
+	struct cec_adapter *adap = fh->adap;
+	bool block = !(filp->f_flags & O_NONBLOCK);
+	void __user *parg = (void __user *)arg;
+
+	if (!cec_is_registered(adap))
+		return -ENODEV;
+
+	switch (cmd) {
+	case CEC_ADAP_G_CAPS:
+		return cec_adap_g_caps(adap, parg);
+
+	case CEC_ADAP_G_PHYS_ADDR:
+		return cec_adap_g_phys_addr(adap, parg);
+
+	case CEC_ADAP_S_PHYS_ADDR:
+		return cec_adap_s_phys_addr(adap, fh, block, parg);
+
+	case CEC_ADAP_G_LOG_ADDRS:
+		return cec_adap_g_log_addrs(adap, parg);
+
+	case CEC_ADAP_S_LOG_ADDRS:
+		return cec_adap_s_log_addrs(adap, fh, block, parg);
+
+	case CEC_ADAP_G_CONNECTOR_INFO:
+		return cec_adap_g_connector_info(adap, parg);
+
+	case CEC_TRANSMIT:
+		return cec_transmit(adap, fh, block, parg);
+
+	case CEC_RECEIVE:
+		return cec_receive(adap, fh, block, parg);
+
+	case CEC_DQEVENT:
+		return cec_dqevent(adap, fh, block, parg);
+
+	case CEC_G_MODE:
+		return cec_g_mode(adap, fh, parg);
+
+	case CEC_S_MODE:
+		return cec_s_mode(adap, fh, parg);
+
+	default:
+		return -ENOTTY;
+	}
+}
+
+static int cec_open(struct inode *inode, struct file *filp)
+{
+	struct cec_devnode *devnode =
+		container_of(inode->i_cdev, struct cec_devnode, cdev);
+	struct cec_adapter *adap = to_cec_adapter(devnode);
+	struct cec_fh *fh = kzalloc(sizeof(*fh), GFP_KERNEL);
+	/*
+	 * Initial events that are automatically sent when the cec device is
+	 * opened.
+	 */
+	struct cec_event ev = {
+		.event = CEC_EVENT_STATE_CHANGE,
+		.flags = CEC_EVENT_FL_INITIAL_STATE,
+	};
+	unsigned int i;
+	int err;
+
+	if (!fh)
+		return -ENOMEM;
+
+	INIT_LIST_HEAD(&fh->msgs);
+	INIT_LIST_HEAD(&fh->xfer_list);
+	for (i = 0; i < CEC_NUM_EVENTS; i++)
+		INIT_LIST_HEAD(&fh->events[i]);
+	mutex_init(&fh->lock);
+	init_waitqueue_head(&fh->wait);
+
+	fh->mode_initiator = CEC_MODE_INITIATOR;
+	fh->adap = adap;
+
+	err = cec_get_device(devnode);
+	if (err) {
+		kfree(fh);
+		return err;
+	}
+
+	filp->private_data = fh;
+
+	/* Queue up initial state events */
+	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_fh(fh, &ev, 0);
+#ifdef CONFIG_CEC_PIN
+	if (adap->pin && adap->pin->ops->read_hpd &&
+	    !adap->devnode.unregistered) {
+		err = adap->pin->ops->read_hpd(adap);
+		if (err >= 0) {
+			ev.event = err ? CEC_EVENT_PIN_HPD_HIGH :
+					 CEC_EVENT_PIN_HPD_LOW;
+			cec_queue_event_fh(fh, &ev, 0);
+		}
+	}
+	if (adap->pin && adap->pin->ops->read_5v &&
+	    !adap->devnode.unregistered) {
+		err = adap->pin->ops->read_5v(adap);
+		if (err >= 0) {
+			ev.event = err ? CEC_EVENT_PIN_5V_HIGH :
+					 CEC_EVENT_PIN_5V_LOW;
+			cec_queue_event_fh(fh, &ev, 0);
+		}
+	}
+#endif
+
+	mutex_lock(&devnode->lock);
+	mutex_lock(&devnode->lock_fhs);
+	list_add(&fh->list, &devnode->fhs);
+	mutex_unlock(&devnode->lock_fhs);
+	mutex_unlock(&devnode->lock);
+
+	return 0;
+}
+
+/* Override for the release function */
+static int cec_release(struct inode *inode, struct file *filp)
+{
+	struct cec_devnode *devnode = cec_devnode_data(filp);
+	struct cec_adapter *adap = to_cec_adapter(devnode);
+	struct cec_fh *fh = filp->private_data;
+	unsigned int i;
+
+	mutex_lock(&adap->lock);
+	if (adap->cec_initiator == fh)
+		adap->cec_initiator = NULL;
+	if (adap->cec_follower == fh) {
+		adap->cec_follower = NULL;
+		adap->passthrough = false;
+	}
+	if (fh->mode_follower == CEC_MODE_FOLLOWER)
+		adap->follower_cnt--;
+	if (fh->mode_follower == CEC_MODE_MONITOR_PIN)
+		cec_monitor_pin_cnt_dec(adap);
+	if (fh->mode_follower == CEC_MODE_MONITOR_ALL)
+		cec_monitor_all_cnt_dec(adap);
+	mutex_unlock(&adap->lock);
+
+	mutex_lock(&devnode->lock);
+	mutex_lock(&devnode->lock_fhs);
+	list_del(&fh->list);
+	mutex_unlock(&devnode->lock_fhs);
+	mutex_unlock(&devnode->lock);
+
+	/* Unhook pending transmits from this filehandle. */
+	mutex_lock(&adap->lock);
+	while (!list_empty(&fh->xfer_list)) {
+		struct cec_data *data =
+			list_first_entry(&fh->xfer_list, struct cec_data, xfer_list);
+
+		data->blocking = false;
+		data->fh = NULL;
+		list_del_init(&data->xfer_list);
+	}
+	mutex_unlock(&adap->lock);
+	while (!list_empty(&fh->msgs)) {
+		struct cec_msg_entry *entry =
+			list_first_entry(&fh->msgs, struct cec_msg_entry, list);
+
+		list_del(&entry->list);
+		kfree(entry);
+	}
+	for (i = CEC_NUM_CORE_EVENTS; i < CEC_NUM_EVENTS; i++) {
+		while (!list_empty(&fh->events[i])) {
+			struct cec_event_entry *entry =
+				list_first_entry(&fh->events[i],
+						 struct cec_event_entry, list);
+
+			list_del(&entry->list);
+			kfree(entry);
+		}
+	}
+	kfree(fh);
+
+	cec_put_device(devnode);
+	filp->private_data = NULL;
+	return 0;
+}
+
+const struct file_operations cec_devnode_fops = {
+	.owner = THIS_MODULE,
+	.open = cec_open,
+	.unlocked_ioctl = cec_ioctl,
+	.compat_ioctl = cec_ioctl,
+	.release = cec_release,
+	.poll = cec_poll,
+	.llseek = no_llseek,
+};
diff --git a/drivers/media/cec/core/cec-core.c b/drivers/media/cec/core/cec-core.c
new file mode 100644
index 000000000..7e153c5ca
--- /dev/null
+++ b/drivers/media/cec/core/cec-core.c
@@ -0,0 +1,472 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * cec-core.c - HDMI Consumer Electronics Control framework - Core
+ *
+ * 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/slab.h>
+#include <linux/mm.h>
+#include <linux/string.h>
+#include <linux/types.h>
+
+#include "cec-priv.h"
+
+#define CEC_NUM_DEVICES	256
+#define CEC_NAME	"cec"
+
+/*
+ * 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)
+
+int cec_debug;
+module_param_named(debug, cec_debug, int, 0644);
+MODULE_PARM_DESC(debug, "debug level (0-2)");
+
+static bool debug_phys_addr;
+module_param(debug_phys_addr, bool, 0644);
+MODULE_PARM_DESC(debug_phys_addr, "add CEC_CAP_PHYS_ADDR if set");
+
+static dev_t cec_dev_t;
+
+/* Active devices */
+static DEFINE_MUTEX(cec_devnode_lock);
+static DECLARE_BITMAP(cec_devnode_nums, CEC_NUM_DEVICES);
+
+static struct dentry *top_cec_dir;
+
+/* dev to cec_devnode */
+#define to_cec_devnode(cd) container_of(cd, struct cec_devnode, dev)
+
+int cec_get_device(struct cec_devnode *devnode)
+{
+	/*
+	 * Check if the cec device is available. This needs to be done with
+	 * the devnode->lock held to prevent an open/unregister race:
+	 * without the lock, the device could be unregistered and freed between
+	 * the devnode->registered check and get_device() calls, leading to
+	 * a crash.
+	 */
+	mutex_lock(&devnode->lock);
+	/*
+	 * return ENXIO if the cec device has been removed
+	 * already or if it is not registered anymore.
+	 */
+	if (!devnode->registered) {
+		mutex_unlock(&devnode->lock);
+		return -ENXIO;
+	}
+	/* and increase the device refcount */
+	get_device(&devnode->dev);
+	mutex_unlock(&devnode->lock);
+	return 0;
+}
+
+void cec_put_device(struct cec_devnode *devnode)
+{
+	put_device(&devnode->dev);
+}
+
+/* Called when the last user of the cec device exits. */
+static void cec_devnode_release(struct device *cd)
+{
+	struct cec_devnode *devnode = to_cec_devnode(cd);
+
+	mutex_lock(&cec_devnode_lock);
+	/* Mark device node number as free */
+	clear_bit(devnode->minor, cec_devnode_nums);
+	mutex_unlock(&cec_devnode_lock);
+
+	cec_delete_adapter(to_cec_adapter(devnode));
+}
+
+static struct bus_type cec_bus_type = {
+	.name = CEC_NAME,
+};
+
+/*
+ * Register a cec device node
+ *
+ * The registration code assigns minor numbers and registers the new device node
+ * with the kernel. An error is returned if no free minor number can be found,
+ * or if the registration of the device node fails.
+ *
+ * Zero is returned on success.
+ *
+ * Note that if the cec_devnode_register call fails, the release() callback of
+ * the cec_devnode structure is *not* called, so the caller is responsible for
+ * freeing any data.
+ */
+static int __must_check cec_devnode_register(struct cec_devnode *devnode,
+					     struct module *owner)
+{
+	int minor;
+	int ret;
+
+	/* Part 1: Find a free minor number */
+	mutex_lock(&cec_devnode_lock);
+	minor = find_first_zero_bit(cec_devnode_nums, CEC_NUM_DEVICES);
+	if (minor == CEC_NUM_DEVICES) {
+		mutex_unlock(&cec_devnode_lock);
+		pr_err("could not get a free minor\n");
+		return -ENFILE;
+	}
+
+	set_bit(minor, cec_devnode_nums);
+	mutex_unlock(&cec_devnode_lock);
+
+	devnode->minor = minor;
+	devnode->dev.bus = &cec_bus_type;
+	devnode->dev.devt = MKDEV(MAJOR(cec_dev_t), minor);
+	devnode->dev.release = cec_devnode_release;
+	dev_set_name(&devnode->dev, "cec%d", devnode->minor);
+	device_initialize(&devnode->dev);
+
+	/* Part 2: Initialize and register the character device */
+	cdev_init(&devnode->cdev, &cec_devnode_fops);
+	devnode->cdev.owner = owner;
+	kobject_set_name(&devnode->cdev.kobj, "cec%d", devnode->minor);
+
+	devnode->registered = true;
+	ret = cdev_device_add(&devnode->cdev, &devnode->dev);
+	if (ret) {
+		devnode->registered = false;
+		pr_err("%s: cdev_device_add failed\n", __func__);
+		goto clr_bit;
+	}
+
+	return 0;
+
+clr_bit:
+	mutex_lock(&cec_devnode_lock);
+	clear_bit(devnode->minor, cec_devnode_nums);
+	mutex_unlock(&cec_devnode_lock);
+	return ret;
+}
+
+/*
+ * Unregister a cec device node
+ *
+ * This unregisters the passed device. Future open calls will be met with
+ * errors.
+ *
+ * This function can safely be called if the device node has never been
+ * registered or has already been unregistered.
+ */
+static void cec_devnode_unregister(struct cec_adapter *adap)
+{
+	struct cec_devnode *devnode = &adap->devnode;
+	struct cec_fh *fh;
+
+	mutex_lock(&devnode->lock);
+
+	/* Check if devnode was never registered or already unregistered */
+	if (!devnode->registered || devnode->unregistered) {
+		mutex_unlock(&devnode->lock);
+		return;
+	}
+	devnode->registered = false;
+	devnode->unregistered = true;
+
+	mutex_lock(&devnode->lock_fhs);
+	list_for_each_entry(fh, &devnode->fhs, list)
+		wake_up_interruptible(&fh->wait);
+	mutex_unlock(&devnode->lock_fhs);
+
+	mutex_unlock(&devnode->lock);
+
+	mutex_lock(&adap->lock);
+	__cec_s_phys_addr(adap, CEC_PHYS_ADDR_INVALID, false);
+	__cec_s_log_addrs(adap, NULL, false);
+	// Disable the adapter (since adap->devnode.unregistered is true)
+	cec_adap_enable(adap);
+	mutex_unlock(&adap->lock);
+
+	cdev_device_del(&devnode->cdev, &devnode->dev);
+	put_device(&devnode->dev);
+}
+
+#ifdef CONFIG_DEBUG_FS
+static ssize_t cec_error_inj_write(struct file *file,
+	const char __user *ubuf, size_t count, loff_t *ppos)
+{
+	struct seq_file *sf = file->private_data;
+	struct cec_adapter *adap = sf->private;
+	char *buf;
+	char *line;
+	char *p;
+
+	buf = memdup_user_nul(ubuf, min_t(size_t, PAGE_SIZE, count));
+	if (IS_ERR(buf))
+		return PTR_ERR(buf);
+	p = buf;
+	while (p && *p) {
+		p = skip_spaces(p);
+		line = strsep(&p, "\n");
+		if (!*line || *line == '#')
+			continue;
+		if (!call_op(adap, error_inj_parse_line, line)) {
+			kfree(buf);
+			return -EINVAL;
+		}
+	}
+	kfree(buf);
+	return count;
+}
+
+static int cec_error_inj_show(struct seq_file *sf, void *unused)
+{
+	struct cec_adapter *adap = sf->private;
+
+	return call_op(adap, error_inj_show, sf);
+}
+
+static int cec_error_inj_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, cec_error_inj_show, inode->i_private);
+}
+
+static const struct file_operations cec_error_inj_fops = {
+	.open = cec_error_inj_open,
+	.write = cec_error_inj_write,
+	.read = seq_read,
+	.llseek = seq_lseek,
+	.release = single_release,
+};
+#endif
+
+struct cec_adapter *cec_allocate_adapter(const struct cec_adap_ops *ops,
+					 void *priv, const char *name, u32 caps,
+					 u8 available_las)
+{
+	struct cec_adapter *adap;
+	int res;
+
+#ifndef CONFIG_MEDIA_CEC_RC
+	caps &= ~CEC_CAP_RC;
+#endif
+
+	if (WARN_ON(!caps))
+		return ERR_PTR(-EINVAL);
+	if (WARN_ON(!ops))
+		return ERR_PTR(-EINVAL);
+	if (WARN_ON(!available_las || available_las > CEC_MAX_LOG_ADDRS))
+		return ERR_PTR(-EINVAL);
+	adap = kzalloc(sizeof(*adap), GFP_KERNEL);
+	if (!adap)
+		return ERR_PTR(-ENOMEM);
+	strscpy(adap->name, name, sizeof(adap->name));
+	adap->phys_addr = CEC_PHYS_ADDR_INVALID;
+	adap->cec_pin_is_high = true;
+	adap->log_addrs.cec_version = CEC_OP_CEC_VERSION_2_0;
+	adap->log_addrs.vendor_id = CEC_VENDOR_ID_NONE;
+	adap->capabilities = caps;
+	if (debug_phys_addr)
+		adap->capabilities |= CEC_CAP_PHYS_ADDR;
+	adap->needs_hpd = caps & CEC_CAP_NEEDS_HPD;
+	adap->available_log_addrs = available_las;
+	adap->sequence = 0;
+	adap->ops = ops;
+	adap->priv = priv;
+	mutex_init(&adap->lock);
+	INIT_LIST_HEAD(&adap->transmit_queue);
+	INIT_LIST_HEAD(&adap->wait_queue);
+	init_waitqueue_head(&adap->kthread_waitq);
+
+	/* adap->devnode initialization */
+	INIT_LIST_HEAD(&adap->devnode.fhs);
+	mutex_init(&adap->devnode.lock_fhs);
+	mutex_init(&adap->devnode.lock);
+
+	adap->kthread = kthread_run(cec_thread_func, adap, "cec-%s", name);
+	if (IS_ERR(adap->kthread)) {
+		pr_err("cec-%s: kernel_thread() failed\n", name);
+		res = PTR_ERR(adap->kthread);
+		kfree(adap);
+		return ERR_PTR(res);
+	}
+
+#ifdef CONFIG_MEDIA_CEC_RC
+	if (!(caps & CEC_CAP_RC))
+		return adap;
+
+	/* Prepare the RC input device */
+	adap->rc = rc_allocate_device(RC_DRIVER_SCANCODE);
+	if (!adap->rc) {
+		pr_err("cec-%s: failed to allocate memory for rc_dev\n",
+		       name);
+		kthread_stop(adap->kthread);
+		kfree(adap);
+		return ERR_PTR(-ENOMEM);
+	}
+
+	snprintf(adap->input_phys, sizeof(adap->input_phys),
+		 "%s/input0", adap->name);
+
+	adap->rc->device_name = adap->name;
+	adap->rc->input_phys = adap->input_phys;
+	adap->rc->input_id.bustype = BUS_CEC;
+	adap->rc->input_id.vendor = 0;
+	adap->rc->input_id.product = 0;
+	adap->rc->input_id.version = 1;
+	adap->rc->driver_name = CEC_NAME;
+	adap->rc->allowed_protocols = RC_PROTO_BIT_CEC;
+	adap->rc->priv = adap;
+	adap->rc->map_name = RC_MAP_CEC;
+	adap->rc->timeout = MS_TO_US(550);
+#endif
+	return adap;
+}
+EXPORT_SYMBOL_GPL(cec_allocate_adapter);
+
+int cec_register_adapter(struct cec_adapter *adap,
+			 struct device *parent)
+{
+	int res;
+
+	if (IS_ERR_OR_NULL(adap))
+		return 0;
+
+	if (WARN_ON(!parent))
+		return -EINVAL;
+
+	adap->owner = parent->driver->owner;
+	adap->devnode.dev.parent = parent;
+	if (!adap->xfer_timeout_ms)
+		adap->xfer_timeout_ms = CEC_XFER_TIMEOUT_MS;
+
+#ifdef CONFIG_MEDIA_CEC_RC
+	if (adap->capabilities & CEC_CAP_RC) {
+		adap->rc->dev.parent = parent;
+		res = rc_register_device(adap->rc);
+
+		if (res) {
+			pr_err("cec-%s: failed to prepare input device\n",
+			       adap->name);
+			rc_free_device(adap->rc);
+			adap->rc = NULL;
+			return res;
+		}
+	}
+#endif
+
+	res = cec_devnode_register(&adap->devnode, adap->owner);
+	if (res) {
+#ifdef CONFIG_MEDIA_CEC_RC
+		/* Note: rc_unregister also calls rc_free */
+		rc_unregister_device(adap->rc);
+		adap->rc = NULL;
+#endif
+		return res;
+	}
+
+	dev_set_drvdata(&adap->devnode.dev, adap);
+#ifdef CONFIG_DEBUG_FS
+	if (!top_cec_dir)
+		return 0;
+
+	adap->cec_dir = debugfs_create_dir(dev_name(&adap->devnode.dev),
+					   top_cec_dir);
+
+	debugfs_create_devm_seqfile(&adap->devnode.dev, "status", adap->cec_dir,
+				    cec_adap_status);
+
+	if (!adap->ops->error_inj_show || !adap->ops->error_inj_parse_line)
+		return 0;
+	debugfs_create_file("error-inj", 0644, adap->cec_dir, adap,
+			    &cec_error_inj_fops);
+#endif
+	return 0;
+}
+EXPORT_SYMBOL_GPL(cec_register_adapter);
+
+void cec_unregister_adapter(struct cec_adapter *adap)
+{
+	if (IS_ERR_OR_NULL(adap))
+		return;
+
+#ifdef CONFIG_MEDIA_CEC_RC
+	/* Note: rc_unregister also calls rc_free */
+	rc_unregister_device(adap->rc);
+	adap->rc = NULL;
+#endif
+	debugfs_remove_recursive(adap->cec_dir);
+#ifdef CONFIG_CEC_NOTIFIER
+	cec_notifier_cec_adap_unregister(adap->notifier, adap);
+#endif
+	cec_devnode_unregister(adap);
+}
+EXPORT_SYMBOL_GPL(cec_unregister_adapter);
+
+void cec_delete_adapter(struct cec_adapter *adap)
+{
+	if (IS_ERR_OR_NULL(adap))
+		return;
+	if (adap->kthread_config)
+		kthread_stop(adap->kthread_config);
+	kthread_stop(adap->kthread);
+	if (adap->ops->adap_free)
+		adap->ops->adap_free(adap);
+#ifdef CONFIG_MEDIA_CEC_RC
+	rc_free_device(adap->rc);
+#endif
+	kfree(adap);
+}
+EXPORT_SYMBOL_GPL(cec_delete_adapter);
+
+/*
+ *	Initialise cec for linux
+ */
+static int __init cec_devnode_init(void)
+{
+	int ret = alloc_chrdev_region(&cec_dev_t, 0, CEC_NUM_DEVICES, CEC_NAME);
+
+	if (ret < 0) {
+		pr_warn("cec: unable to allocate major\n");
+		return ret;
+	}
+
+#ifdef CONFIG_DEBUG_FS
+	top_cec_dir = debugfs_create_dir("cec", NULL);
+	if (IS_ERR_OR_NULL(top_cec_dir)) {
+		pr_warn("cec: Failed to create debugfs cec dir\n");
+		top_cec_dir = NULL;
+	}
+#endif
+
+	ret = bus_register(&cec_bus_type);
+	if (ret < 0) {
+		unregister_chrdev_region(cec_dev_t, CEC_NUM_DEVICES);
+		pr_warn("cec: bus_register failed\n");
+		return -EIO;
+	}
+
+	return 0;
+}
+
+static void __exit cec_devnode_exit(void)
+{
+	debugfs_remove_recursive(top_cec_dir);
+	bus_unregister(&cec_bus_type);
+	unregister_chrdev_region(cec_dev_t, CEC_NUM_DEVICES);
+}
+
+subsys_initcall(cec_devnode_init);
+module_exit(cec_devnode_exit)
+
+MODULE_AUTHOR("Hans Verkuil <hans.verkuil@cisco.com>");
+MODULE_DESCRIPTION("Device node registration for cec drivers");
+MODULE_LICENSE("GPL");
diff --git a/drivers/media/cec/core/cec-notifier.c b/drivers/media/cec/core/cec-notifier.c
new file mode 100644
index 000000000..389dc664b
--- /dev/null
+++ b/drivers/media/cec/core/cec-notifier.c
@@ -0,0 +1,250 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * cec-notifier.c - notify CEC drivers of physical address changes
+ *
+ * Copyright 2016 Russell King.
+ * Copyright 2016-2017 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
+ */
+
+#include <linux/export.h>
+#include <linux/string.h>
+#include <linux/slab.h>
+#include <linux/i2c.h>
+#include <linux/list.h>
+#include <linux/kref.h>
+#include <linux/of_platform.h>
+
+#include <media/cec.h>
+#include <media/cec-notifier.h>
+#include <drm/drm_edid.h>
+
+struct cec_notifier {
+	struct mutex lock;
+	struct list_head head;
+	struct kref kref;
+	struct device *hdmi_dev;
+	struct cec_connector_info conn_info;
+	const char *port_name;
+	struct cec_adapter *cec_adap;
+
+	u16 phys_addr;
+};
+
+static LIST_HEAD(cec_notifiers);
+static DEFINE_MUTEX(cec_notifiers_lock);
+
+/**
+ * cec_notifier_get_conn - find or create a new cec_notifier for the given
+ * device and connector tuple.
+ * @hdmi_dev: device that sends the events.
+ * @port_name: the connector name from which the event occurs
+ *
+ * If a notifier for device @dev already exists, then increase the refcount
+ * and return that notifier.
+ *
+ * If it doesn't exist, then allocate a new notifier struct and return a
+ * pointer to that new struct.
+ *
+ * Return NULL if the memory could not be allocated.
+ */
+static struct cec_notifier *
+cec_notifier_get_conn(struct device *hdmi_dev, const char *port_name)
+{
+	struct cec_notifier *n;
+
+	mutex_lock(&cec_notifiers_lock);
+	list_for_each_entry(n, &cec_notifiers, head) {
+		if (n->hdmi_dev == hdmi_dev &&
+		    (!port_name ||
+		     (n->port_name && !strcmp(n->port_name, port_name)))) {
+			kref_get(&n->kref);
+			mutex_unlock(&cec_notifiers_lock);
+			return n;
+		}
+	}
+	n = kzalloc(sizeof(*n), GFP_KERNEL);
+	if (!n)
+		goto unlock;
+	n->hdmi_dev = hdmi_dev;
+	if (port_name) {
+		n->port_name = kstrdup(port_name, GFP_KERNEL);
+		if (!n->port_name) {
+			kfree(n);
+			n = NULL;
+			goto unlock;
+		}
+	}
+	n->phys_addr = CEC_PHYS_ADDR_INVALID;
+
+	mutex_init(&n->lock);
+	kref_init(&n->kref);
+	list_add_tail(&n->head, &cec_notifiers);
+unlock:
+	mutex_unlock(&cec_notifiers_lock);
+	return n;
+}
+
+static void cec_notifier_release(struct kref *kref)
+{
+	struct cec_notifier *n =
+		container_of(kref, struct cec_notifier, kref);
+
+	list_del(&n->head);
+	kfree(n->port_name);
+	kfree(n);
+}
+
+static void cec_notifier_put(struct cec_notifier *n)
+{
+	mutex_lock(&cec_notifiers_lock);
+	kref_put(&n->kref, cec_notifier_release);
+	mutex_unlock(&cec_notifiers_lock);
+}
+
+struct cec_notifier *
+cec_notifier_conn_register(struct device *hdmi_dev, const char *port_name,
+			   const struct cec_connector_info *conn_info)
+{
+	struct cec_notifier *n = cec_notifier_get_conn(hdmi_dev, port_name);
+
+	if (!n)
+		return n;
+
+	mutex_lock(&n->lock);
+	n->phys_addr = CEC_PHYS_ADDR_INVALID;
+	if (conn_info)
+		n->conn_info = *conn_info;
+	else
+		memset(&n->conn_info, 0, sizeof(n->conn_info));
+	if (n->cec_adap) {
+		if (!n->cec_adap->adap_controls_phys_addr)
+			cec_phys_addr_invalidate(n->cec_adap);
+		cec_s_conn_info(n->cec_adap, conn_info);
+	}
+	mutex_unlock(&n->lock);
+	return n;
+}
+EXPORT_SYMBOL_GPL(cec_notifier_conn_register);
+
+void cec_notifier_conn_unregister(struct cec_notifier *n)
+{
+	if (!n)
+		return;
+
+	mutex_lock(&n->lock);
+	memset(&n->conn_info, 0, sizeof(n->conn_info));
+	n->phys_addr = CEC_PHYS_ADDR_INVALID;
+	if (n->cec_adap) {
+		if (!n->cec_adap->adap_controls_phys_addr)
+			cec_phys_addr_invalidate(n->cec_adap);
+		cec_s_conn_info(n->cec_adap, NULL);
+	}
+	mutex_unlock(&n->lock);
+	cec_notifier_put(n);
+}
+EXPORT_SYMBOL_GPL(cec_notifier_conn_unregister);
+
+struct cec_notifier *
+cec_notifier_cec_adap_register(struct device *hdmi_dev, const char *port_name,
+			       struct cec_adapter *adap)
+{
+	struct cec_notifier *n;
+
+	if (WARN_ON(!adap))
+		return NULL;
+
+	n = cec_notifier_get_conn(hdmi_dev, port_name);
+	if (!n)
+		return n;
+
+	mutex_lock(&n->lock);
+	n->cec_adap = adap;
+	adap->conn_info = n->conn_info;
+	adap->notifier = n;
+	if (!adap->adap_controls_phys_addr)
+		cec_s_phys_addr(adap, n->phys_addr, false);
+	mutex_unlock(&n->lock);
+	return n;
+}
+EXPORT_SYMBOL_GPL(cec_notifier_cec_adap_register);
+
+void cec_notifier_cec_adap_unregister(struct cec_notifier *n,
+				      struct cec_adapter *adap)
+{
+	if (!n)
+		return;
+
+	mutex_lock(&n->lock);
+	adap->notifier = NULL;
+	n->cec_adap = NULL;
+	mutex_unlock(&n->lock);
+	cec_notifier_put(n);
+}
+EXPORT_SYMBOL_GPL(cec_notifier_cec_adap_unregister);
+
+void cec_notifier_set_phys_addr(struct cec_notifier *n, u16 pa)
+{
+	if (n == NULL)
+		return;
+
+	mutex_lock(&n->lock);
+	n->phys_addr = pa;
+	if (n->cec_adap && !n->cec_adap->adap_controls_phys_addr)
+		cec_s_phys_addr(n->cec_adap, n->phys_addr, false);
+	mutex_unlock(&n->lock);
+}
+EXPORT_SYMBOL_GPL(cec_notifier_set_phys_addr);
+
+void cec_notifier_set_phys_addr_from_edid(struct cec_notifier *n,
+					  const struct edid *edid)
+{
+	u16 pa = CEC_PHYS_ADDR_INVALID;
+
+	if (n == NULL)
+		return;
+
+	if (edid && edid->extensions)
+		pa = cec_get_edid_phys_addr((const u8 *)edid,
+				EDID_LENGTH * (edid->extensions + 1), NULL);
+	cec_notifier_set_phys_addr(n, pa);
+}
+EXPORT_SYMBOL_GPL(cec_notifier_set_phys_addr_from_edid);
+
+struct device *cec_notifier_parse_hdmi_phandle(struct device *dev)
+{
+	struct platform_device *hdmi_pdev;
+	struct device *hdmi_dev = NULL;
+	struct device_node *np;
+
+	np = of_parse_phandle(dev->of_node, "hdmi-phandle", 0);
+
+	if (!np) {
+		dev_err(dev, "Failed to find HDMI node in device tree\n");
+		return ERR_PTR(-ENODEV);
+	}
+
+	hdmi_pdev = of_find_device_by_node(np);
+	if (hdmi_pdev)
+		hdmi_dev = &hdmi_pdev->dev;
+#if IS_REACHABLE(CONFIG_I2C)
+	if (!hdmi_dev) {
+		struct i2c_client *hdmi_client = of_find_i2c_device_by_node(np);
+
+		if (hdmi_client)
+			hdmi_dev = &hdmi_client->dev;
+	}
+#endif
+	of_node_put(np);
+	if (!hdmi_dev)
+		return ERR_PTR(-EPROBE_DEFER);
+
+	/*
+	 * Note that the device struct is only used as a key into the
+	 * cec_notifiers list, it is never actually accessed.
+	 * So we decrement the reference here so we don't leak
+	 * memory.
+	 */
+	put_device(hdmi_dev);
+	return hdmi_dev;
+}
+EXPORT_SYMBOL_GPL(cec_notifier_parse_hdmi_phandle);
diff --git a/drivers/media/cec/core/cec-pin-error-inj.c b/drivers/media/cec/core/cec-pin-error-inj.c
new file mode 100644
index 000000000..fc0968b9d
--- /dev/null
+++ b/drivers/media/cec/core/cec-pin-error-inj.c
@@ -0,0 +1,345 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright 2017 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
+ */
+
+#include <linux/delay.h>
+#include <linux/slab.h>
+#include <linux/sched/types.h>
+
+#include <media/cec-pin.h>
+#include "cec-pin-priv.h"
+
+struct cec_error_inj_cmd {
+	unsigned int mode_offset;
+	int arg_idx;
+	const char *cmd;
+};
+
+static const struct cec_error_inj_cmd cec_error_inj_cmds[] = {
+	{ CEC_ERROR_INJ_RX_NACK_OFFSET, -1, "rx-nack" },
+	{ CEC_ERROR_INJ_RX_LOW_DRIVE_OFFSET,
+	  CEC_ERROR_INJ_RX_LOW_DRIVE_ARG_IDX, "rx-low-drive" },
+	{ CEC_ERROR_INJ_RX_ADD_BYTE_OFFSET, -1, "rx-add-byte" },
+	{ CEC_ERROR_INJ_RX_REMOVE_BYTE_OFFSET, -1, "rx-remove-byte" },
+	{ CEC_ERROR_INJ_RX_ARB_LOST_OFFSET,
+	  CEC_ERROR_INJ_RX_ARB_LOST_ARG_IDX, "rx-arb-lost" },
+
+	{ CEC_ERROR_INJ_TX_NO_EOM_OFFSET, -1, "tx-no-eom" },
+	{ CEC_ERROR_INJ_TX_EARLY_EOM_OFFSET, -1, "tx-early-eom" },
+	{ CEC_ERROR_INJ_TX_ADD_BYTES_OFFSET,
+	  CEC_ERROR_INJ_TX_ADD_BYTES_ARG_IDX, "tx-add-bytes" },
+	{ CEC_ERROR_INJ_TX_REMOVE_BYTE_OFFSET, -1, "tx-remove-byte" },
+	{ CEC_ERROR_INJ_TX_SHORT_BIT_OFFSET,
+	  CEC_ERROR_INJ_TX_SHORT_BIT_ARG_IDX, "tx-short-bit" },
+	{ CEC_ERROR_INJ_TX_LONG_BIT_OFFSET,
+	  CEC_ERROR_INJ_TX_LONG_BIT_ARG_IDX, "tx-long-bit" },
+	{ CEC_ERROR_INJ_TX_CUSTOM_BIT_OFFSET,
+	  CEC_ERROR_INJ_TX_CUSTOM_BIT_ARG_IDX, "tx-custom-bit" },
+	{ CEC_ERROR_INJ_TX_SHORT_START_OFFSET, -1, "tx-short-start" },
+	{ CEC_ERROR_INJ_TX_LONG_START_OFFSET, -1, "tx-long-start" },
+	{ CEC_ERROR_INJ_TX_CUSTOM_START_OFFSET, -1, "tx-custom-start" },
+	{ CEC_ERROR_INJ_TX_LAST_BIT_OFFSET,
+	  CEC_ERROR_INJ_TX_LAST_BIT_ARG_IDX, "tx-last-bit" },
+	{ CEC_ERROR_INJ_TX_LOW_DRIVE_OFFSET,
+	  CEC_ERROR_INJ_TX_LOW_DRIVE_ARG_IDX, "tx-low-drive" },
+	{ 0, -1, NULL }
+};
+
+u16 cec_pin_rx_error_inj(struct cec_pin *pin)
+{
+	u16 cmd = CEC_ERROR_INJ_OP_ANY;
+
+	/* Only when 18 bits have been received do we have a valid cmd */
+	if (!(pin->error_inj[cmd] & CEC_ERROR_INJ_RX_MASK) &&
+	    pin->rx_bit >= 18)
+		cmd = pin->rx_msg.msg[1];
+	return (pin->error_inj[cmd] & CEC_ERROR_INJ_RX_MASK) ? cmd :
+		CEC_ERROR_INJ_OP_ANY;
+}
+
+u16 cec_pin_tx_error_inj(struct cec_pin *pin)
+{
+	u16 cmd = CEC_ERROR_INJ_OP_ANY;
+
+	if (!(pin->error_inj[cmd] & CEC_ERROR_INJ_TX_MASK) &&
+	    pin->tx_msg.len > 1)
+		cmd = pin->tx_msg.msg[1];
+	return (pin->error_inj[cmd] & CEC_ERROR_INJ_TX_MASK) ? cmd :
+		CEC_ERROR_INJ_OP_ANY;
+}
+
+bool cec_pin_error_inj_parse_line(struct cec_adapter *adap, char *line)
+{
+	static const char *delims = " \t\r";
+	struct cec_pin *pin = adap->pin;
+	unsigned int i;
+	bool has_pos = false;
+	char *p = line;
+	char *token;
+	char *comma;
+	u64 *error;
+	u8 *args;
+	bool has_op;
+	u8 op;
+	u8 mode;
+	u8 pos;
+
+	p = skip_spaces(p);
+	token = strsep(&p, delims);
+	if (!strcmp(token, "clear")) {
+		memset(pin->error_inj, 0, sizeof(pin->error_inj));
+		pin->rx_toggle = pin->tx_toggle = false;
+		pin->tx_ignore_nack_until_eom = false;
+		pin->tx_custom_pulse = false;
+		pin->tx_custom_low_usecs = CEC_TIM_CUSTOM_DEFAULT;
+		pin->tx_custom_high_usecs = CEC_TIM_CUSTOM_DEFAULT;
+		return true;
+	}
+	if (!strcmp(token, "rx-clear")) {
+		for (i = 0; i <= CEC_ERROR_INJ_OP_ANY; i++)
+			pin->error_inj[i] &= ~CEC_ERROR_INJ_RX_MASK;
+		pin->rx_toggle = false;
+		return true;
+	}
+	if (!strcmp(token, "tx-clear")) {
+		for (i = 0; i <= CEC_ERROR_INJ_OP_ANY; i++)
+			pin->error_inj[i] &= ~CEC_ERROR_INJ_TX_MASK;
+		pin->tx_toggle = false;
+		pin->tx_ignore_nack_until_eom = false;
+		pin->tx_custom_pulse = false;
+		pin->tx_custom_low_usecs = CEC_TIM_CUSTOM_DEFAULT;
+		pin->tx_custom_high_usecs = CEC_TIM_CUSTOM_DEFAULT;
+		return true;
+	}
+	if (!strcmp(token, "tx-ignore-nack-until-eom")) {
+		pin->tx_ignore_nack_until_eom = true;
+		return true;
+	}
+	if (!strcmp(token, "tx-custom-pulse")) {
+		pin->tx_custom_pulse = true;
+		cec_pin_start_timer(pin);
+		return true;
+	}
+	if (!p)
+		return false;
+
+	p = skip_spaces(p);
+	if (!strcmp(token, "tx-custom-low-usecs")) {
+		u32 usecs;
+
+		if (kstrtou32(p, 0, &usecs) || usecs > 10000000)
+			return false;
+		pin->tx_custom_low_usecs = usecs;
+		return true;
+	}
+	if (!strcmp(token, "tx-custom-high-usecs")) {
+		u32 usecs;
+
+		if (kstrtou32(p, 0, &usecs) || usecs > 10000000)
+			return false;
+		pin->tx_custom_high_usecs = usecs;
+		return true;
+	}
+
+	comma = strchr(token, ',');
+	if (comma)
+		*comma++ = '\0';
+	if (!strcmp(token, "any")) {
+		has_op = false;
+		error = pin->error_inj + CEC_ERROR_INJ_OP_ANY;
+		args = pin->error_inj_args[CEC_ERROR_INJ_OP_ANY];
+	} else if (!kstrtou8(token, 0, &op)) {
+		has_op = true;
+		error = pin->error_inj + op;
+		args = pin->error_inj_args[op];
+	} else {
+		return false;
+	}
+
+	mode = CEC_ERROR_INJ_MODE_ONCE;
+	if (comma) {
+		if (!strcmp(comma, "off"))
+			mode = CEC_ERROR_INJ_MODE_OFF;
+		else if (!strcmp(comma, "once"))
+			mode = CEC_ERROR_INJ_MODE_ONCE;
+		else if (!strcmp(comma, "always"))
+			mode = CEC_ERROR_INJ_MODE_ALWAYS;
+		else if (!strcmp(comma, "toggle"))
+			mode = CEC_ERROR_INJ_MODE_TOGGLE;
+		else
+			return false;
+	}
+
+	token = strsep(&p, delims);
+	if (p) {
+		p = skip_spaces(p);
+		has_pos = !kstrtou8(p, 0, &pos);
+	}
+
+	if (!strcmp(token, "clear")) {
+		*error = 0;
+		return true;
+	}
+	if (!strcmp(token, "rx-clear")) {
+		*error &= ~CEC_ERROR_INJ_RX_MASK;
+		return true;
+	}
+	if (!strcmp(token, "tx-clear")) {
+		*error &= ~CEC_ERROR_INJ_TX_MASK;
+		return true;
+	}
+
+	for (i = 0; cec_error_inj_cmds[i].cmd; i++) {
+		const char *cmd = cec_error_inj_cmds[i].cmd;
+		unsigned int mode_offset;
+		u64 mode_mask;
+		int arg_idx;
+		bool is_bit_pos = true;
+
+		if (strcmp(token, cmd))
+			continue;
+
+		mode_offset = cec_error_inj_cmds[i].mode_offset;
+		mode_mask = CEC_ERROR_INJ_MODE_MASK << mode_offset;
+		arg_idx = cec_error_inj_cmds[i].arg_idx;
+
+		if (mode_offset == CEC_ERROR_INJ_RX_ARB_LOST_OFFSET) {
+			if (has_op)
+				return false;
+			if (!has_pos)
+				pos = 0x0f;
+			is_bit_pos = false;
+		} else if (mode_offset == CEC_ERROR_INJ_TX_ADD_BYTES_OFFSET) {
+			if (!has_pos || !pos)
+				return false;
+			is_bit_pos = false;
+		}
+
+		if (arg_idx >= 0 && is_bit_pos) {
+			if (!has_pos || pos >= 160)
+				return false;
+			if (has_op && pos < 10 + 8)
+				return false;
+			/* Invalid bit position may not be the Ack bit */
+			if ((mode_offset == CEC_ERROR_INJ_TX_SHORT_BIT_OFFSET ||
+			     mode_offset == CEC_ERROR_INJ_TX_LONG_BIT_OFFSET ||
+			     mode_offset == CEC_ERROR_INJ_TX_CUSTOM_BIT_OFFSET) &&
+			    (pos % 10) == 9)
+				return false;
+		}
+		*error &= ~mode_mask;
+		*error |= (u64)mode << mode_offset;
+		if (arg_idx >= 0)
+			args[arg_idx] = pos;
+		return true;
+	}
+	return false;
+}
+
+static void cec_pin_show_cmd(struct seq_file *sf, u32 cmd, u8 mode)
+{
+	if (cmd == CEC_ERROR_INJ_OP_ANY)
+		seq_puts(sf, "any,");
+	else
+		seq_printf(sf, "0x%02x,", cmd);
+	switch (mode) {
+	case CEC_ERROR_INJ_MODE_ONCE:
+		seq_puts(sf, "once ");
+		break;
+	case CEC_ERROR_INJ_MODE_ALWAYS:
+		seq_puts(sf, "always ");
+		break;
+	case CEC_ERROR_INJ_MODE_TOGGLE:
+		seq_puts(sf, "toggle ");
+		break;
+	default:
+		seq_puts(sf, "off ");
+		break;
+	}
+}
+
+int cec_pin_error_inj_show(struct cec_adapter *adap, struct seq_file *sf)
+{
+	struct cec_pin *pin = adap->pin;
+	unsigned int i, j;
+
+	seq_puts(sf, "# Clear error injections:\n");
+	seq_puts(sf, "#   clear          clear all rx and tx error injections\n");
+	seq_puts(sf, "#   rx-clear       clear all rx error injections\n");
+	seq_puts(sf, "#   tx-clear       clear all tx error injections\n");
+	seq_puts(sf, "#   <op> clear     clear all rx and tx error injections for <op>\n");
+	seq_puts(sf, "#   <op> rx-clear  clear all rx error injections for <op>\n");
+	seq_puts(sf, "#   <op> tx-clear  clear all tx error injections for <op>\n");
+	seq_puts(sf, "#\n");
+	seq_puts(sf, "# RX error injection:\n");
+	seq_puts(sf, "#   <op>[,<mode>] rx-nack              NACK the message instead of sending an ACK\n");
+	seq_puts(sf, "#   <op>[,<mode>] rx-low-drive <bit>   force a low-drive condition at this bit position\n");
+	seq_puts(sf, "#   <op>[,<mode>] rx-add-byte          add a spurious byte to the received CEC message\n");
+	seq_puts(sf, "#   <op>[,<mode>] rx-remove-byte       remove the last byte from the received CEC message\n");
+	seq_puts(sf, "#    any[,<mode>] rx-arb-lost [<poll>] generate a POLL message to trigger an arbitration lost\n");
+	seq_puts(sf, "#\n");
+	seq_puts(sf, "# TX error injection settings:\n");
+	seq_puts(sf, "#   tx-ignore-nack-until-eom           ignore early NACKs until EOM\n");
+	seq_puts(sf, "#   tx-custom-low-usecs <usecs>        define the 'low' time for the custom pulse\n");
+	seq_puts(sf, "#   tx-custom-high-usecs <usecs>       define the 'high' time for the custom pulse\n");
+	seq_puts(sf, "#   tx-custom-pulse                    transmit the custom pulse once the bus is idle\n");
+	seq_puts(sf, "#\n");
+	seq_puts(sf, "# TX error injection:\n");
+	seq_puts(sf, "#   <op>[,<mode>] tx-no-eom            don't set the EOM bit\n");
+	seq_puts(sf, "#   <op>[,<mode>] tx-early-eom         set the EOM bit one byte too soon\n");
+	seq_puts(sf, "#   <op>[,<mode>] tx-add-bytes <num>   append <num> (1-255) spurious bytes to the message\n");
+	seq_puts(sf, "#   <op>[,<mode>] tx-remove-byte       drop the last byte from the message\n");
+	seq_puts(sf, "#   <op>[,<mode>] tx-short-bit <bit>   make this bit shorter than allowed\n");
+	seq_puts(sf, "#   <op>[,<mode>] tx-long-bit <bit>    make this bit longer than allowed\n");
+	seq_puts(sf, "#   <op>[,<mode>] tx-custom-bit <bit>  send the custom pulse instead of this bit\n");
+	seq_puts(sf, "#   <op>[,<mode>] tx-short-start       send a start pulse that's too short\n");
+	seq_puts(sf, "#   <op>[,<mode>] tx-long-start        send a start pulse that's too long\n");
+	seq_puts(sf, "#   <op>[,<mode>] tx-custom-start      send the custom pulse instead of the start pulse\n");
+	seq_puts(sf, "#   <op>[,<mode>] tx-last-bit <bit>    stop sending after this bit\n");
+	seq_puts(sf, "#   <op>[,<mode>] tx-low-drive <bit>   force a low-drive condition at this bit position\n");
+	seq_puts(sf, "#\n");
+	seq_puts(sf, "# <op>       CEC message opcode (0-255) or 'any'\n");
+	seq_puts(sf, "# <mode>     'once' (default), 'always', 'toggle' or 'off'\n");
+	seq_puts(sf, "# <bit>      CEC message bit (0-159)\n");
+	seq_puts(sf, "#            10 bits per 'byte': bits 0-7: data, bit 8: EOM, bit 9: ACK\n");
+	seq_puts(sf, "# <poll>     CEC poll message used to test arbitration lost (0x00-0xff, default 0x0f)\n");
+	seq_puts(sf, "# <usecs>    microseconds (0-10000000, default 1000)\n");
+
+	seq_puts(sf, "\nclear\n");
+
+	for (i = 0; i < ARRAY_SIZE(pin->error_inj); i++) {
+		u64 e = pin->error_inj[i];
+
+		for (j = 0; cec_error_inj_cmds[j].cmd; j++) {
+			const char *cmd = cec_error_inj_cmds[j].cmd;
+			unsigned int mode;
+			unsigned int mode_offset;
+			int arg_idx;
+
+			mode_offset = cec_error_inj_cmds[j].mode_offset;
+			arg_idx = cec_error_inj_cmds[j].arg_idx;
+			mode = (e >> mode_offset) & CEC_ERROR_INJ_MODE_MASK;
+			if (!mode)
+				continue;
+			cec_pin_show_cmd(sf, i, mode);
+			seq_puts(sf, cmd);
+			if (arg_idx >= 0)
+				seq_printf(sf, " %u",
+					   pin->error_inj_args[i][arg_idx]);
+			seq_puts(sf, "\n");
+		}
+	}
+
+	if (pin->tx_ignore_nack_until_eom)
+		seq_puts(sf, "tx-ignore-nack-until-eom\n");
+	if (pin->tx_custom_pulse)
+		seq_puts(sf, "tx-custom-pulse\n");
+	if (pin->tx_custom_low_usecs != CEC_TIM_CUSTOM_DEFAULT)
+		seq_printf(sf, "tx-custom-low-usecs %u\n",
+			   pin->tx_custom_low_usecs);
+	if (pin->tx_custom_high_usecs != CEC_TIM_CUSTOM_DEFAULT)
+		seq_printf(sf, "tx-custom-high-usecs %u\n",
+			   pin->tx_custom_high_usecs);
+	return 0;
+}
diff --git a/drivers/media/cec/core/cec-pin-priv.h b/drivers/media/cec/core/cec-pin-priv.h
new file mode 100644
index 000000000..8eb5819e6
--- /dev/null
+++ b/drivers/media/cec/core/cec-pin-priv.h
@@ -0,0 +1,251 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * cec-pin-priv.h - internal cec-pin header
+ *
+ * Copyright 2017 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
+ */
+
+#ifndef LINUX_CEC_PIN_PRIV_H
+#define LINUX_CEC_PIN_PRIV_H
+
+#include <linux/types.h>
+#include <linux/atomic.h>
+#include <media/cec-pin.h>
+
+#define call_pin_op(pin, op, arg...)					\
+	((pin && pin->ops->op && !pin->adap->devnode.unregistered) ?	\
+	 pin->ops->op(pin->adap, ## arg) : 0)
+
+#define call_void_pin_op(pin, op, arg...)				\
+	do {								\
+		if (pin && pin->ops->op &&				\
+		    !pin->adap->devnode.unregistered)			\
+			pin->ops->op(pin->adap, ## arg);		\
+	} while (0)
+
+enum cec_pin_state {
+	/* CEC is off */
+	CEC_ST_OFF,
+	/* CEC is idle, waiting for Rx or Tx */
+	CEC_ST_IDLE,
+
+	/* Tx states */
+
+	/* Pending Tx, waiting for Signal Free Time to expire */
+	CEC_ST_TX_WAIT,
+	/* Low-drive was detected, wait for bus to go high */
+	CEC_ST_TX_WAIT_FOR_HIGH,
+	/* Drive CEC low for the start bit */
+	CEC_ST_TX_START_BIT_LOW,
+	/* Drive CEC high for the start bit */
+	CEC_ST_TX_START_BIT_HIGH,
+	/* Generate a start bit period that is too short */
+	CEC_ST_TX_START_BIT_HIGH_SHORT,
+	/* Generate a start bit period that is too long */
+	CEC_ST_TX_START_BIT_HIGH_LONG,
+	/* Drive CEC low for the start bit using the custom timing */
+	CEC_ST_TX_START_BIT_LOW_CUSTOM,
+	/* Drive CEC high for the start bit using the custom timing */
+	CEC_ST_TX_START_BIT_HIGH_CUSTOM,
+	/* Drive CEC low for the 0 bit */
+	CEC_ST_TX_DATA_BIT_0_LOW,
+	/* Drive CEC high for the 0 bit */
+	CEC_ST_TX_DATA_BIT_0_HIGH,
+	/* Generate a bit period that is too short */
+	CEC_ST_TX_DATA_BIT_0_HIGH_SHORT,
+	/* Generate a bit period that is too long */
+	CEC_ST_TX_DATA_BIT_0_HIGH_LONG,
+	/* Drive CEC low for the 1 bit */
+	CEC_ST_TX_DATA_BIT_1_LOW,
+	/* Drive CEC high for the 1 bit */
+	CEC_ST_TX_DATA_BIT_1_HIGH,
+	/* Generate a bit period that is too short */
+	CEC_ST_TX_DATA_BIT_1_HIGH_SHORT,
+	/* Generate a bit period that is too long */
+	CEC_ST_TX_DATA_BIT_1_HIGH_LONG,
+	/*
+	 * Wait for start of sample time to check for Ack bit or first
+	 * four initiator bits to check for Arbitration Lost.
+	 */
+	CEC_ST_TX_DATA_BIT_1_HIGH_PRE_SAMPLE,
+	/* Wait for end of bit period after sampling */
+	CEC_ST_TX_DATA_BIT_1_HIGH_POST_SAMPLE,
+	/* Generate a bit period that is too short */
+	CEC_ST_TX_DATA_BIT_1_HIGH_POST_SAMPLE_SHORT,
+	/* Generate a bit period that is too long */
+	CEC_ST_TX_DATA_BIT_1_HIGH_POST_SAMPLE_LONG,
+	/* Drive CEC low for a data bit using the custom timing */
+	CEC_ST_TX_DATA_BIT_LOW_CUSTOM,
+	/* Drive CEC high for a data bit using the custom timing */
+	CEC_ST_TX_DATA_BIT_HIGH_CUSTOM,
+	/* Drive CEC low for a standalone pulse using the custom timing */
+	CEC_ST_TX_PULSE_LOW_CUSTOM,
+	/* Drive CEC high for a standalone pulse using the custom timing */
+	CEC_ST_TX_PULSE_HIGH_CUSTOM,
+	/* Start low drive */
+	CEC_ST_TX_LOW_DRIVE,
+
+	/* Rx states */
+
+	/* Start bit low detected */
+	CEC_ST_RX_START_BIT_LOW,
+	/* Start bit high detected */
+	CEC_ST_RX_START_BIT_HIGH,
+	/* Wait for bit sample time */
+	CEC_ST_RX_DATA_SAMPLE,
+	/* Wait for earliest end of bit period after sampling */
+	CEC_ST_RX_DATA_POST_SAMPLE,
+	/* Wait for CEC to go low (i.e. end of bit period) */
+	CEC_ST_RX_DATA_WAIT_FOR_LOW,
+	/* Drive CEC low to send 0 Ack bit */
+	CEC_ST_RX_ACK_LOW,
+	/* End of 0 Ack time, wait for earliest end of bit period */
+	CEC_ST_RX_ACK_LOW_POST,
+	/* Wait for CEC to go high (i.e. end of bit period */
+	CEC_ST_RX_ACK_HIGH_POST,
+	/* Wait for earliest end of bit period and end of message */
+	CEC_ST_RX_ACK_FINISH,
+	/* Start low drive */
+	CEC_ST_RX_LOW_DRIVE,
+
+	/* Monitor pin using interrupts */
+	CEC_ST_RX_IRQ,
+
+	/* Total number of pin states */
+	CEC_PIN_STATES
+};
+
+/* Error Injection */
+
+/* Error injection modes */
+#define CEC_ERROR_INJ_MODE_OFF				0
+#define CEC_ERROR_INJ_MODE_ONCE				1
+#define CEC_ERROR_INJ_MODE_ALWAYS			2
+#define CEC_ERROR_INJ_MODE_TOGGLE			3
+#define CEC_ERROR_INJ_MODE_MASK				3ULL
+
+/* Receive error injection options */
+#define CEC_ERROR_INJ_RX_NACK_OFFSET			0
+#define CEC_ERROR_INJ_RX_LOW_DRIVE_OFFSET		2
+#define CEC_ERROR_INJ_RX_ADD_BYTE_OFFSET		4
+#define CEC_ERROR_INJ_RX_REMOVE_BYTE_OFFSET		6
+#define CEC_ERROR_INJ_RX_ARB_LOST_OFFSET		8
+#define CEC_ERROR_INJ_RX_MASK				0xffffULL
+
+/* Transmit error injection options */
+#define CEC_ERROR_INJ_TX_NO_EOM_OFFSET			16
+#define CEC_ERROR_INJ_TX_EARLY_EOM_OFFSET		18
+#define CEC_ERROR_INJ_TX_SHORT_BIT_OFFSET		20
+#define CEC_ERROR_INJ_TX_LONG_BIT_OFFSET		22
+#define CEC_ERROR_INJ_TX_CUSTOM_BIT_OFFSET		24
+#define CEC_ERROR_INJ_TX_SHORT_START_OFFSET		26
+#define CEC_ERROR_INJ_TX_LONG_START_OFFSET		28
+#define CEC_ERROR_INJ_TX_CUSTOM_START_OFFSET		30
+#define CEC_ERROR_INJ_TX_LAST_BIT_OFFSET		32
+#define CEC_ERROR_INJ_TX_ADD_BYTES_OFFSET		34
+#define CEC_ERROR_INJ_TX_REMOVE_BYTE_OFFSET		36
+#define CEC_ERROR_INJ_TX_LOW_DRIVE_OFFSET		38
+#define CEC_ERROR_INJ_TX_MASK				0xffffffffffff0000ULL
+
+#define CEC_ERROR_INJ_RX_LOW_DRIVE_ARG_IDX		0
+#define CEC_ERROR_INJ_RX_ARB_LOST_ARG_IDX		1
+
+#define CEC_ERROR_INJ_TX_ADD_BYTES_ARG_IDX		2
+#define CEC_ERROR_INJ_TX_SHORT_BIT_ARG_IDX		3
+#define CEC_ERROR_INJ_TX_LONG_BIT_ARG_IDX		4
+#define CEC_ERROR_INJ_TX_CUSTOM_BIT_ARG_IDX		5
+#define CEC_ERROR_INJ_TX_LAST_BIT_ARG_IDX		6
+#define CEC_ERROR_INJ_TX_LOW_DRIVE_ARG_IDX		7
+#define CEC_ERROR_INJ_NUM_ARGS				8
+
+/* Special CEC op values */
+#define CEC_ERROR_INJ_OP_ANY				0x00000100
+
+/* The default for the low/high time of the custom pulse */
+#define CEC_TIM_CUSTOM_DEFAULT				1000
+
+#define CEC_NUM_PIN_EVENTS				128
+#define CEC_PIN_EVENT_FL_IS_HIGH			(1 << 0)
+#define CEC_PIN_EVENT_FL_DROPPED			(1 << 1)
+
+#define CEC_PIN_IRQ_UNCHANGED	0
+#define CEC_PIN_IRQ_DISABLE	1
+#define CEC_PIN_IRQ_ENABLE	2
+
+struct cec_pin {
+	struct cec_adapter		*adap;
+	const struct cec_pin_ops	*ops;
+	struct task_struct		*kthread;
+	wait_queue_head_t		kthread_waitq;
+	struct hrtimer			timer;
+	ktime_t				ts;
+	unsigned int			wait_usecs;
+	u16				la_mask;
+	bool				monitor_all;
+	bool				rx_eom;
+	bool				enable_irq_failed;
+	enum cec_pin_state		state;
+	struct cec_msg			tx_msg;
+	u32				tx_bit;
+	bool				tx_nacked;
+	u32				tx_signal_free_time;
+	bool				tx_toggle;
+	struct cec_msg			rx_msg;
+	u32				rx_bit;
+	bool				rx_toggle;
+	u32				rx_start_bit_low_too_short_cnt;
+	u64				rx_start_bit_low_too_short_ts;
+	u32				rx_start_bit_low_too_short_delta;
+	u32				rx_start_bit_too_short_cnt;
+	u64				rx_start_bit_too_short_ts;
+	u32				rx_start_bit_too_short_delta;
+	u32				rx_start_bit_too_long_cnt;
+	u32				rx_data_bit_too_short_cnt;
+	u64				rx_data_bit_too_short_ts;
+	u32				rx_data_bit_too_short_delta;
+	u32				rx_data_bit_too_long_cnt;
+	u32				rx_low_drive_cnt;
+
+	struct cec_msg			work_rx_msg;
+	u8				work_tx_status;
+	ktime_t				work_tx_ts;
+	atomic_t			work_irq_change;
+	atomic_t			work_pin_num_events;
+	unsigned int			work_pin_events_wr;
+	unsigned int			work_pin_events_rd;
+	ktime_t				work_pin_ts[CEC_NUM_PIN_EVENTS];
+	u8				work_pin_events[CEC_NUM_PIN_EVENTS];
+	bool				work_pin_events_dropped;
+	u32				work_pin_events_dropped_cnt;
+	ktime_t				timer_ts;
+	u32				timer_cnt;
+	u32				timer_100us_overruns;
+	u32				timer_300us_overruns;
+	u32				timer_max_overrun;
+	u32				timer_sum_overrun;
+
+	u32				tx_custom_low_usecs;
+	u32				tx_custom_high_usecs;
+	bool				tx_ignore_nack_until_eom;
+	bool				tx_custom_pulse;
+	bool				tx_generated_poll;
+	bool				tx_post_eom;
+	u8				tx_extra_bytes;
+	u32				tx_low_drive_cnt;
+#ifdef CONFIG_CEC_PIN_ERROR_INJ
+	u64				error_inj[CEC_ERROR_INJ_OP_ANY + 1];
+	u8				error_inj_args[CEC_ERROR_INJ_OP_ANY + 1][CEC_ERROR_INJ_NUM_ARGS];
+#endif
+};
+
+void cec_pin_start_timer(struct cec_pin *pin);
+
+#ifdef CONFIG_CEC_PIN_ERROR_INJ
+bool cec_pin_error_inj_parse_line(struct cec_adapter *adap, char *line);
+int cec_pin_error_inj_show(struct cec_adapter *adap, struct seq_file *sf);
+
+u16 cec_pin_rx_error_inj(struct cec_pin *pin);
+u16 cec_pin_tx_error_inj(struct cec_pin *pin);
+#endif
+
+#endif
diff --git a/drivers/media/cec/core/cec-pin.c b/drivers/media/cec/core/cec-pin.c
new file mode 100644
index 000000000..68353c5dc
--- /dev/null
+++ b/drivers/media/cec/core/cec-pin.c
@@ -0,0 +1,1357 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright 2017 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
+ */
+
+#include <linux/delay.h>
+#include <linux/slab.h>
+#include <linux/sched/types.h>
+
+#include <media/cec-pin.h>
+#include "cec-pin-priv.h"
+
+/* All timings are in microseconds */
+
+/* start bit timings */
+#define CEC_TIM_START_BIT_LOW		3700
+#define CEC_TIM_START_BIT_LOW_MIN	3500
+#define CEC_TIM_START_BIT_LOW_MAX	3900
+#define CEC_TIM_START_BIT_TOTAL		4500
+#define CEC_TIM_START_BIT_TOTAL_MIN	4300
+#define CEC_TIM_START_BIT_TOTAL_MAX	4700
+
+/* data bit timings */
+#define CEC_TIM_DATA_BIT_0_LOW		1500
+#define CEC_TIM_DATA_BIT_0_LOW_MIN	1300
+#define CEC_TIM_DATA_BIT_0_LOW_MAX	1700
+#define CEC_TIM_DATA_BIT_1_LOW		600
+#define CEC_TIM_DATA_BIT_1_LOW_MIN	400
+#define CEC_TIM_DATA_BIT_1_LOW_MAX	800
+#define CEC_TIM_DATA_BIT_TOTAL		2400
+#define CEC_TIM_DATA_BIT_TOTAL_MIN	2050
+#define CEC_TIM_DATA_BIT_TOTAL_MAX	2750
+/* earliest safe time to sample the bit state */
+#define CEC_TIM_DATA_BIT_SAMPLE		850
+/* earliest time the bit is back to 1 (T7 + 50) */
+#define CEC_TIM_DATA_BIT_HIGH		1750
+
+/* when idle, sample once per millisecond */
+#define CEC_TIM_IDLE_SAMPLE		1000
+/* when processing the start bit, sample twice per millisecond */
+#define CEC_TIM_START_BIT_SAMPLE	500
+/* when polling for a state change, sample once every 50 microseconds */
+#define CEC_TIM_SAMPLE			50
+
+#define CEC_TIM_LOW_DRIVE_ERROR		(1.5 * CEC_TIM_DATA_BIT_TOTAL)
+
+/*
+ * Total data bit time that is too short/long for a valid bit,
+ * used for error injection.
+ */
+#define CEC_TIM_DATA_BIT_TOTAL_SHORT	1800
+#define CEC_TIM_DATA_BIT_TOTAL_LONG	2900
+
+/*
+ * Total start bit time that is too short/long for a valid bit,
+ * used for error injection.
+ */
+#define CEC_TIM_START_BIT_TOTAL_SHORT	4100
+#define CEC_TIM_START_BIT_TOTAL_LONG	5000
+
+/* Data bits are 0-7, EOM is bit 8 and ACK is bit 9 */
+#define EOM_BIT				8
+#define ACK_BIT				9
+
+struct cec_state {
+	const char * const name;
+	unsigned int usecs;
+};
+
+static const struct cec_state states[CEC_PIN_STATES] = {
+	{ "Off",		   0 },
+	{ "Idle",		   CEC_TIM_IDLE_SAMPLE },
+	{ "Tx Wait",		   CEC_TIM_SAMPLE },
+	{ "Tx Wait for High",	   CEC_TIM_IDLE_SAMPLE },
+	{ "Tx Start Bit Low",	   CEC_TIM_START_BIT_LOW },
+	{ "Tx Start Bit High",	   CEC_TIM_START_BIT_TOTAL - CEC_TIM_START_BIT_LOW },
+	{ "Tx Start Bit High Short", CEC_TIM_START_BIT_TOTAL_SHORT - CEC_TIM_START_BIT_LOW },
+	{ "Tx Start Bit High Long", CEC_TIM_START_BIT_TOTAL_LONG - CEC_TIM_START_BIT_LOW },
+	{ "Tx Start Bit Low Custom", 0 },
+	{ "Tx Start Bit High Custom", 0 },
+	{ "Tx Data 0 Low",	   CEC_TIM_DATA_BIT_0_LOW },
+	{ "Tx Data 0 High",	   CEC_TIM_DATA_BIT_TOTAL - CEC_TIM_DATA_BIT_0_LOW },
+	{ "Tx Data 0 High Short",  CEC_TIM_DATA_BIT_TOTAL_SHORT - CEC_TIM_DATA_BIT_0_LOW },
+	{ "Tx Data 0 High Long",   CEC_TIM_DATA_BIT_TOTAL_LONG - CEC_TIM_DATA_BIT_0_LOW },
+	{ "Tx Data 1 Low",	   CEC_TIM_DATA_BIT_1_LOW },
+	{ "Tx Data 1 High",	   CEC_TIM_DATA_BIT_TOTAL - CEC_TIM_DATA_BIT_1_LOW },
+	{ "Tx Data 1 High Short",  CEC_TIM_DATA_BIT_TOTAL_SHORT - CEC_TIM_DATA_BIT_1_LOW },
+	{ "Tx Data 1 High Long",   CEC_TIM_DATA_BIT_TOTAL_LONG - CEC_TIM_DATA_BIT_1_LOW },
+	{ "Tx Data 1 High Pre Sample", CEC_TIM_DATA_BIT_SAMPLE - CEC_TIM_DATA_BIT_1_LOW },
+	{ "Tx Data 1 High Post Sample", CEC_TIM_DATA_BIT_TOTAL - CEC_TIM_DATA_BIT_SAMPLE },
+	{ "Tx Data 1 High Post Sample Short", CEC_TIM_DATA_BIT_TOTAL_SHORT - CEC_TIM_DATA_BIT_SAMPLE },
+	{ "Tx Data 1 High Post Sample Long", CEC_TIM_DATA_BIT_TOTAL_LONG - CEC_TIM_DATA_BIT_SAMPLE },
+	{ "Tx Data Bit Low Custom", 0 },
+	{ "Tx Data Bit High Custom", 0 },
+	{ "Tx Pulse Low Custom",   0 },
+	{ "Tx Pulse High Custom",  0 },
+	{ "Tx Low Drive",	   CEC_TIM_LOW_DRIVE_ERROR },
+	{ "Rx Start Bit Low",	   CEC_TIM_SAMPLE },
+	{ "Rx Start Bit High",	   CEC_TIM_SAMPLE },
+	{ "Rx Data Sample",	   CEC_TIM_DATA_BIT_SAMPLE },
+	{ "Rx Data Post Sample",   CEC_TIM_DATA_BIT_HIGH - CEC_TIM_DATA_BIT_SAMPLE },
+	{ "Rx Data Wait for Low",  CEC_TIM_SAMPLE },
+	{ "Rx Ack Low",		   CEC_TIM_DATA_BIT_0_LOW },
+	{ "Rx Ack Low Post",	   CEC_TIM_DATA_BIT_HIGH - CEC_TIM_DATA_BIT_0_LOW },
+	{ "Rx Ack High Post",	   CEC_TIM_DATA_BIT_HIGH },
+	{ "Rx Ack Finish",	   CEC_TIM_DATA_BIT_TOTAL_MIN - CEC_TIM_DATA_BIT_HIGH },
+	{ "Rx Low Drive",	   CEC_TIM_LOW_DRIVE_ERROR },
+	{ "Rx Irq",		   0 },
+};
+
+static void cec_pin_update(struct cec_pin *pin, bool v, bool force)
+{
+	if (!force && v == pin->adap->cec_pin_is_high)
+		return;
+
+	pin->adap->cec_pin_is_high = v;
+	if (atomic_read(&pin->work_pin_num_events) < CEC_NUM_PIN_EVENTS) {
+		u8 ev = v;
+
+		if (pin->work_pin_events_dropped) {
+			pin->work_pin_events_dropped = false;
+			ev |= CEC_PIN_EVENT_FL_DROPPED;
+		}
+		pin->work_pin_events[pin->work_pin_events_wr] = ev;
+		pin->work_pin_ts[pin->work_pin_events_wr] = ktime_get();
+		pin->work_pin_events_wr =
+			(pin->work_pin_events_wr + 1) % CEC_NUM_PIN_EVENTS;
+		atomic_inc(&pin->work_pin_num_events);
+	} else {
+		pin->work_pin_events_dropped = true;
+		pin->work_pin_events_dropped_cnt++;
+	}
+	wake_up_interruptible(&pin->kthread_waitq);
+}
+
+static bool cec_pin_read(struct cec_pin *pin)
+{
+	bool v = call_pin_op(pin, read);
+
+	cec_pin_update(pin, v, false);
+	return v;
+}
+
+static void cec_pin_low(struct cec_pin *pin)
+{
+	call_void_pin_op(pin, low);
+	cec_pin_update(pin, false, false);
+}
+
+static bool cec_pin_high(struct cec_pin *pin)
+{
+	call_void_pin_op(pin, high);
+	return cec_pin_read(pin);
+}
+
+static bool rx_error_inj(struct cec_pin *pin, unsigned int mode_offset,
+			 int arg_idx, u8 *arg)
+{
+#ifdef CONFIG_CEC_PIN_ERROR_INJ
+	u16 cmd = cec_pin_rx_error_inj(pin);
+	u64 e = pin->error_inj[cmd];
+	unsigned int mode = (e >> mode_offset) & CEC_ERROR_INJ_MODE_MASK;
+
+	if (arg_idx >= 0) {
+		u8 pos = pin->error_inj_args[cmd][arg_idx];
+
+		if (arg)
+			*arg = pos;
+		else if (pos != pin->rx_bit)
+			return false;
+	}
+
+	switch (mode) {
+	case CEC_ERROR_INJ_MODE_ONCE:
+		pin->error_inj[cmd] &=
+			~(CEC_ERROR_INJ_MODE_MASK << mode_offset);
+		return true;
+	case CEC_ERROR_INJ_MODE_ALWAYS:
+		return true;
+	case CEC_ERROR_INJ_MODE_TOGGLE:
+		return pin->rx_toggle;
+	default:
+		return false;
+	}
+#else
+	return false;
+#endif
+}
+
+static bool rx_nack(struct cec_pin *pin)
+{
+	return rx_error_inj(pin, CEC_ERROR_INJ_RX_NACK_OFFSET, -1, NULL);
+}
+
+static bool rx_low_drive(struct cec_pin *pin)
+{
+	return rx_error_inj(pin, CEC_ERROR_INJ_RX_LOW_DRIVE_OFFSET,
+			    CEC_ERROR_INJ_RX_LOW_DRIVE_ARG_IDX, NULL);
+}
+
+static bool rx_add_byte(struct cec_pin *pin)
+{
+	return rx_error_inj(pin, CEC_ERROR_INJ_RX_ADD_BYTE_OFFSET, -1, NULL);
+}
+
+static bool rx_remove_byte(struct cec_pin *pin)
+{
+	return rx_error_inj(pin, CEC_ERROR_INJ_RX_REMOVE_BYTE_OFFSET, -1, NULL);
+}
+
+static bool rx_arb_lost(struct cec_pin *pin, u8 *poll)
+{
+	return pin->tx_msg.len == 0 &&
+		rx_error_inj(pin, CEC_ERROR_INJ_RX_ARB_LOST_OFFSET,
+			     CEC_ERROR_INJ_RX_ARB_LOST_ARG_IDX, poll);
+}
+
+static bool tx_error_inj(struct cec_pin *pin, unsigned int mode_offset,
+			 int arg_idx, u8 *arg)
+{
+#ifdef CONFIG_CEC_PIN_ERROR_INJ
+	u16 cmd = cec_pin_tx_error_inj(pin);
+	u64 e = pin->error_inj[cmd];
+	unsigned int mode = (e >> mode_offset) & CEC_ERROR_INJ_MODE_MASK;
+
+	if (arg_idx >= 0) {
+		u8 pos = pin->error_inj_args[cmd][arg_idx];
+
+		if (arg)
+			*arg = pos;
+		else if (pos != pin->tx_bit)
+			return false;
+	}
+
+	switch (mode) {
+	case CEC_ERROR_INJ_MODE_ONCE:
+		pin->error_inj[cmd] &=
+			~(CEC_ERROR_INJ_MODE_MASK << mode_offset);
+		return true;
+	case CEC_ERROR_INJ_MODE_ALWAYS:
+		return true;
+	case CEC_ERROR_INJ_MODE_TOGGLE:
+		return pin->tx_toggle;
+	default:
+		return false;
+	}
+#else
+	return false;
+#endif
+}
+
+static bool tx_no_eom(struct cec_pin *pin)
+{
+	return tx_error_inj(pin, CEC_ERROR_INJ_TX_NO_EOM_OFFSET, -1, NULL);
+}
+
+static bool tx_early_eom(struct cec_pin *pin)
+{
+	return tx_error_inj(pin, CEC_ERROR_INJ_TX_EARLY_EOM_OFFSET, -1, NULL);
+}
+
+static bool tx_short_bit(struct cec_pin *pin)
+{
+	return tx_error_inj(pin, CEC_ERROR_INJ_TX_SHORT_BIT_OFFSET,
+			    CEC_ERROR_INJ_TX_SHORT_BIT_ARG_IDX, NULL);
+}
+
+static bool tx_long_bit(struct cec_pin *pin)
+{
+	return tx_error_inj(pin, CEC_ERROR_INJ_TX_LONG_BIT_OFFSET,
+			    CEC_ERROR_INJ_TX_LONG_BIT_ARG_IDX, NULL);
+}
+
+static bool tx_custom_bit(struct cec_pin *pin)
+{
+	return tx_error_inj(pin, CEC_ERROR_INJ_TX_CUSTOM_BIT_OFFSET,
+			    CEC_ERROR_INJ_TX_CUSTOM_BIT_ARG_IDX, NULL);
+}
+
+static bool tx_short_start(struct cec_pin *pin)
+{
+	return tx_error_inj(pin, CEC_ERROR_INJ_TX_SHORT_START_OFFSET, -1, NULL);
+}
+
+static bool tx_long_start(struct cec_pin *pin)
+{
+	return tx_error_inj(pin, CEC_ERROR_INJ_TX_LONG_START_OFFSET, -1, NULL);
+}
+
+static bool tx_custom_start(struct cec_pin *pin)
+{
+	return tx_error_inj(pin, CEC_ERROR_INJ_TX_CUSTOM_START_OFFSET,
+			    -1, NULL);
+}
+
+static bool tx_last_bit(struct cec_pin *pin)
+{
+	return tx_error_inj(pin, CEC_ERROR_INJ_TX_LAST_BIT_OFFSET,
+			    CEC_ERROR_INJ_TX_LAST_BIT_ARG_IDX, NULL);
+}
+
+static u8 tx_add_bytes(struct cec_pin *pin)
+{
+	u8 bytes;
+
+	if (tx_error_inj(pin, CEC_ERROR_INJ_TX_ADD_BYTES_OFFSET,
+			 CEC_ERROR_INJ_TX_ADD_BYTES_ARG_IDX, &bytes))
+		return bytes;
+	return 0;
+}
+
+static bool tx_remove_byte(struct cec_pin *pin)
+{
+	return tx_error_inj(pin, CEC_ERROR_INJ_TX_REMOVE_BYTE_OFFSET, -1, NULL);
+}
+
+static bool tx_low_drive(struct cec_pin *pin)
+{
+	return tx_error_inj(pin, CEC_ERROR_INJ_TX_LOW_DRIVE_OFFSET,
+			    CEC_ERROR_INJ_TX_LOW_DRIVE_ARG_IDX, NULL);
+}
+
+static void cec_pin_to_idle(struct cec_pin *pin)
+{
+	/*
+	 * Reset all status fields, release the bus and
+	 * go to idle state.
+	 */
+	pin->rx_bit = pin->tx_bit = 0;
+	pin->rx_msg.len = 0;
+	memset(pin->rx_msg.msg, 0, sizeof(pin->rx_msg.msg));
+	pin->ts = ns_to_ktime(0);
+	pin->tx_generated_poll = false;
+	pin->tx_post_eom = false;
+	if (pin->state >= CEC_ST_TX_WAIT &&
+	    pin->state <= CEC_ST_TX_LOW_DRIVE)
+		pin->tx_toggle ^= 1;
+	if (pin->state >= CEC_ST_RX_START_BIT_LOW &&
+	    pin->state <= CEC_ST_RX_LOW_DRIVE)
+		pin->rx_toggle ^= 1;
+	pin->state = CEC_ST_IDLE;
+}
+
+/*
+ * Handle Transmit-related states
+ *
+ * Basic state changes when transmitting:
+ *
+ * Idle -> Tx Wait (waiting for the end of signal free time) ->
+ *	Tx Start Bit Low -> Tx Start Bit High ->
+ *
+ *   Regular data bits + EOM:
+ *	Tx Data 0 Low -> Tx Data 0 High ->
+ *   or:
+ *	Tx Data 1 Low -> Tx Data 1 High ->
+ *
+ *   First 4 data bits or Ack bit:
+ *	Tx Data 0 Low -> Tx Data 0 High ->
+ *   or:
+ *	Tx Data 1 Low -> Tx Data 1 High -> Tx Data 1 Pre Sample ->
+ *		Tx Data 1 Post Sample ->
+ *
+ *   After the last Ack go to Idle.
+ *
+ * If it detects a Low Drive condition then:
+ *	Tx Wait For High -> Idle
+ *
+ * If it loses arbitration, then it switches to state Rx Data Post Sample.
+ */
+static void cec_pin_tx_states(struct cec_pin *pin, ktime_t ts)
+{
+	bool v;
+	bool is_ack_bit, ack;
+
+	switch (pin->state) {
+	case CEC_ST_TX_WAIT_FOR_HIGH:
+		if (cec_pin_read(pin))
+			cec_pin_to_idle(pin);
+		break;
+
+	case CEC_ST_TX_START_BIT_LOW:
+		if (tx_short_start(pin)) {
+			/*
+			 * Error Injection: send an invalid (too short)
+			 * start pulse.
+			 */
+			pin->state = CEC_ST_TX_START_BIT_HIGH_SHORT;
+		} else if (tx_long_start(pin)) {
+			/*
+			 * Error Injection: send an invalid (too long)
+			 * start pulse.
+			 */
+			pin->state = CEC_ST_TX_START_BIT_HIGH_LONG;
+		} else {
+			pin->state = CEC_ST_TX_START_BIT_HIGH;
+		}
+		/* Generate start bit */
+		cec_pin_high(pin);
+		break;
+
+	case CEC_ST_TX_START_BIT_LOW_CUSTOM:
+		pin->state = CEC_ST_TX_START_BIT_HIGH_CUSTOM;
+		/* Generate start bit */
+		cec_pin_high(pin);
+		break;
+
+	case CEC_ST_TX_DATA_BIT_1_HIGH_POST_SAMPLE:
+	case CEC_ST_TX_DATA_BIT_1_HIGH_POST_SAMPLE_SHORT:
+	case CEC_ST_TX_DATA_BIT_1_HIGH_POST_SAMPLE_LONG:
+		if (pin->tx_nacked) {
+			cec_pin_to_idle(pin);
+			pin->tx_msg.len = 0;
+			if (pin->tx_generated_poll)
+				break;
+			pin->work_tx_ts = ts;
+			pin->work_tx_status = CEC_TX_STATUS_NACK;
+			wake_up_interruptible(&pin->kthread_waitq);
+			break;
+		}
+		fallthrough;
+	case CEC_ST_TX_DATA_BIT_0_HIGH:
+	case CEC_ST_TX_DATA_BIT_0_HIGH_SHORT:
+	case CEC_ST_TX_DATA_BIT_0_HIGH_LONG:
+	case CEC_ST_TX_DATA_BIT_1_HIGH:
+	case CEC_ST_TX_DATA_BIT_1_HIGH_SHORT:
+	case CEC_ST_TX_DATA_BIT_1_HIGH_LONG:
+		/*
+		 * If the read value is 1, then all is OK, otherwise we have a
+		 * low drive condition.
+		 *
+		 * Special case: when we generate a poll message due to an
+		 * Arbitration Lost error injection, then ignore this since
+		 * the pin can actually be low in that case.
+		 */
+		if (!cec_pin_read(pin) && !pin->tx_generated_poll) {
+			/*
+			 * It's 0, so someone detected an error and pulled the
+			 * line low for 1.5 times the nominal bit period.
+			 */
+			pin->tx_msg.len = 0;
+			pin->state = CEC_ST_TX_WAIT_FOR_HIGH;
+			pin->work_tx_ts = ts;
+			pin->work_tx_status = CEC_TX_STATUS_LOW_DRIVE;
+			pin->tx_low_drive_cnt++;
+			wake_up_interruptible(&pin->kthread_waitq);
+			break;
+		}
+		fallthrough;
+	case CEC_ST_TX_DATA_BIT_HIGH_CUSTOM:
+		if (tx_last_bit(pin)) {
+			/* Error Injection: just stop sending after this bit */
+			cec_pin_to_idle(pin);
+			pin->tx_msg.len = 0;
+			if (pin->tx_generated_poll)
+				break;
+			pin->work_tx_ts = ts;
+			pin->work_tx_status = CEC_TX_STATUS_OK;
+			wake_up_interruptible(&pin->kthread_waitq);
+			break;
+		}
+		pin->tx_bit++;
+		fallthrough;
+	case CEC_ST_TX_START_BIT_HIGH:
+	case CEC_ST_TX_START_BIT_HIGH_SHORT:
+	case CEC_ST_TX_START_BIT_HIGH_LONG:
+	case CEC_ST_TX_START_BIT_HIGH_CUSTOM:
+		if (tx_low_drive(pin)) {
+			/* Error injection: go to low drive */
+			cec_pin_low(pin);
+			pin->state = CEC_ST_TX_LOW_DRIVE;
+			pin->tx_msg.len = 0;
+			if (pin->tx_generated_poll)
+				break;
+			pin->work_tx_ts = ts;
+			pin->work_tx_status = CEC_TX_STATUS_LOW_DRIVE;
+			pin->tx_low_drive_cnt++;
+			wake_up_interruptible(&pin->kthread_waitq);
+			break;
+		}
+		if (pin->tx_bit / 10 >= pin->tx_msg.len + pin->tx_extra_bytes) {
+			cec_pin_to_idle(pin);
+			pin->tx_msg.len = 0;
+			if (pin->tx_generated_poll)
+				break;
+			pin->work_tx_ts = ts;
+			pin->work_tx_status = CEC_TX_STATUS_OK;
+			wake_up_interruptible(&pin->kthread_waitq);
+			break;
+		}
+
+		switch (pin->tx_bit % 10) {
+		default: {
+			/*
+			 * In the CEC_ERROR_INJ_TX_ADD_BYTES case we transmit
+			 * extra bytes, so pin->tx_bit / 10 can become >= 16.
+			 * Generate bit values for those extra bytes instead
+			 * of reading them from the transmit buffer.
+			 */
+			unsigned int idx = (pin->tx_bit / 10);
+			u8 val = idx;
+
+			if (idx < pin->tx_msg.len)
+				val = pin->tx_msg.msg[idx];
+			v = val & (1 << (7 - (pin->tx_bit % 10)));
+
+			pin->state = v ? CEC_ST_TX_DATA_BIT_1_LOW :
+					 CEC_ST_TX_DATA_BIT_0_LOW;
+			break;
+		}
+		case EOM_BIT: {
+			unsigned int tot_len = pin->tx_msg.len +
+					       pin->tx_extra_bytes;
+			unsigned int tx_byte_idx = pin->tx_bit / 10;
+
+			v = !pin->tx_post_eom && tx_byte_idx == tot_len - 1;
+			if (tot_len > 1 && tx_byte_idx == tot_len - 2 &&
+			    tx_early_eom(pin)) {
+				/* Error injection: set EOM one byte early */
+				v = true;
+				pin->tx_post_eom = true;
+			} else if (v && tx_no_eom(pin)) {
+				/* Error injection: no EOM */
+				v = false;
+			}
+			pin->state = v ? CEC_ST_TX_DATA_BIT_1_LOW :
+					 CEC_ST_TX_DATA_BIT_0_LOW;
+			break;
+		}
+		case ACK_BIT:
+			pin->state = CEC_ST_TX_DATA_BIT_1_LOW;
+			break;
+		}
+		if (tx_custom_bit(pin))
+			pin->state = CEC_ST_TX_DATA_BIT_LOW_CUSTOM;
+		cec_pin_low(pin);
+		break;
+
+	case CEC_ST_TX_DATA_BIT_0_LOW:
+	case CEC_ST_TX_DATA_BIT_1_LOW:
+		v = pin->state == CEC_ST_TX_DATA_BIT_1_LOW;
+		is_ack_bit = pin->tx_bit % 10 == ACK_BIT;
+		if (v && (pin->tx_bit < 4 || is_ack_bit)) {
+			pin->state = CEC_ST_TX_DATA_BIT_1_HIGH_PRE_SAMPLE;
+		} else if (!is_ack_bit && tx_short_bit(pin)) {
+			/* Error Injection: send an invalid (too short) bit */
+			pin->state = v ? CEC_ST_TX_DATA_BIT_1_HIGH_SHORT :
+					 CEC_ST_TX_DATA_BIT_0_HIGH_SHORT;
+		} else if (!is_ack_bit && tx_long_bit(pin)) {
+			/* Error Injection: send an invalid (too long) bit */
+			pin->state = v ? CEC_ST_TX_DATA_BIT_1_HIGH_LONG :
+					 CEC_ST_TX_DATA_BIT_0_HIGH_LONG;
+		} else {
+			pin->state = v ? CEC_ST_TX_DATA_BIT_1_HIGH :
+					 CEC_ST_TX_DATA_BIT_0_HIGH;
+		}
+		cec_pin_high(pin);
+		break;
+
+	case CEC_ST_TX_DATA_BIT_LOW_CUSTOM:
+		pin->state = CEC_ST_TX_DATA_BIT_HIGH_CUSTOM;
+		cec_pin_high(pin);
+		break;
+
+	case CEC_ST_TX_DATA_BIT_1_HIGH_PRE_SAMPLE:
+		/* Read the CEC value at the sample time */
+		v = cec_pin_read(pin);
+		is_ack_bit = pin->tx_bit % 10 == ACK_BIT;
+		/*
+		 * If v == 0 and we're within the first 4 bits
+		 * of the initiator, then someone else started
+		 * transmitting and we lost the arbitration
+		 * (i.e. the logical address of the other
+		 * transmitter has more leading 0 bits in the
+		 * initiator).
+		 */
+		if (!v && !is_ack_bit && !pin->tx_generated_poll) {
+			pin->tx_msg.len = 0;
+			pin->work_tx_ts = ts;
+			pin->work_tx_status = CEC_TX_STATUS_ARB_LOST;
+			wake_up_interruptible(&pin->kthread_waitq);
+			pin->rx_bit = pin->tx_bit;
+			pin->tx_bit = 0;
+			memset(pin->rx_msg.msg, 0, sizeof(pin->rx_msg.msg));
+			pin->rx_msg.msg[0] = pin->tx_msg.msg[0];
+			pin->rx_msg.msg[0] &= (0xff << (8 - pin->rx_bit));
+			pin->rx_msg.len = 0;
+			pin->ts = ktime_sub_us(ts, CEC_TIM_DATA_BIT_SAMPLE);
+			pin->state = CEC_ST_RX_DATA_POST_SAMPLE;
+			pin->rx_bit++;
+			break;
+		}
+		pin->state = CEC_ST_TX_DATA_BIT_1_HIGH_POST_SAMPLE;
+		if (!is_ack_bit && tx_short_bit(pin)) {
+			/* Error Injection: send an invalid (too short) bit */
+			pin->state = CEC_ST_TX_DATA_BIT_1_HIGH_POST_SAMPLE_SHORT;
+		} else if (!is_ack_bit && tx_long_bit(pin)) {
+			/* Error Injection: send an invalid (too long) bit */
+			pin->state = CEC_ST_TX_DATA_BIT_1_HIGH_POST_SAMPLE_LONG;
+		}
+		if (!is_ack_bit)
+			break;
+		/* Was the message ACKed? */
+		ack = cec_msg_is_broadcast(&pin->tx_msg) ? v : !v;
+		if (!ack && (!pin->tx_ignore_nack_until_eom ||
+		    pin->tx_bit / 10 == pin->tx_msg.len - 1) &&
+		    !pin->tx_post_eom) {
+			/*
+			 * Note: the CEC spec is ambiguous regarding
+			 * what action to take when a NACK appears
+			 * before the last byte of the payload was
+			 * transmitted: either stop transmitting
+			 * immediately, or wait until the last byte
+			 * was transmitted.
+			 *
+			 * Most CEC implementations appear to stop
+			 * immediately, and that's what we do here
+			 * as well.
+			 */
+			pin->tx_nacked = true;
+		}
+		break;
+
+	case CEC_ST_TX_PULSE_LOW_CUSTOM:
+		cec_pin_high(pin);
+		pin->state = CEC_ST_TX_PULSE_HIGH_CUSTOM;
+		break;
+
+	case CEC_ST_TX_PULSE_HIGH_CUSTOM:
+		cec_pin_to_idle(pin);
+		break;
+
+	default:
+		break;
+	}
+}
+
+/*
+ * Handle Receive-related states
+ *
+ * Basic state changes when receiving:
+ *
+ *	Rx Start Bit Low -> Rx Start Bit High ->
+ *   Regular data bits + EOM:
+ *	Rx Data Sample -> Rx Data Post Sample -> Rx Data High ->
+ *   Ack bit 0:
+ *	Rx Ack Low -> Rx Ack Low Post -> Rx Data High ->
+ *   Ack bit 1:
+ *	Rx Ack High Post -> Rx Data High ->
+ *   Ack bit 0 && EOM:
+ *	Rx Ack Low -> Rx Ack Low Post -> Rx Ack Finish -> Idle
+ */
+static void cec_pin_rx_states(struct cec_pin *pin, ktime_t ts)
+{
+	s32 delta;
+	bool v;
+	bool ack;
+	bool bcast, for_us;
+	u8 dest;
+	u8 poll;
+
+	switch (pin->state) {
+	/* Receive states */
+	case CEC_ST_RX_START_BIT_LOW:
+		v = cec_pin_read(pin);
+		if (!v)
+			break;
+		pin->state = CEC_ST_RX_START_BIT_HIGH;
+		delta = ktime_us_delta(ts, pin->ts);
+		/* Start bit low is too short, go back to idle */
+		if (delta < CEC_TIM_START_BIT_LOW_MIN - CEC_TIM_IDLE_SAMPLE) {
+			if (!pin->rx_start_bit_low_too_short_cnt++) {
+				pin->rx_start_bit_low_too_short_ts = ktime_to_ns(pin->ts);
+				pin->rx_start_bit_low_too_short_delta = delta;
+			}
+			cec_pin_to_idle(pin);
+			break;
+		}
+		if (rx_arb_lost(pin, &poll)) {
+			cec_msg_init(&pin->tx_msg, poll >> 4, poll & 0xf);
+			pin->tx_generated_poll = true;
+			pin->tx_extra_bytes = 0;
+			pin->state = CEC_ST_TX_START_BIT_HIGH;
+			pin->ts = ts;
+		}
+		break;
+
+	case CEC_ST_RX_START_BIT_HIGH:
+		v = cec_pin_read(pin);
+		delta = ktime_us_delta(ts, pin->ts);
+		/*
+		 * Unfortunately the spec does not specify when to give up
+		 * and go to idle. We just pick TOTAL_LONG.
+		 */
+		if (v && delta > CEC_TIM_START_BIT_TOTAL_LONG) {
+			pin->rx_start_bit_too_long_cnt++;
+			cec_pin_to_idle(pin);
+			break;
+		}
+		if (v)
+			break;
+		/* Start bit is too short, go back to idle */
+		if (delta < CEC_TIM_START_BIT_TOTAL_MIN - CEC_TIM_IDLE_SAMPLE) {
+			if (!pin->rx_start_bit_too_short_cnt++) {
+				pin->rx_start_bit_too_short_ts = ktime_to_ns(pin->ts);
+				pin->rx_start_bit_too_short_delta = delta;
+			}
+			cec_pin_to_idle(pin);
+			break;
+		}
+		if (rx_low_drive(pin)) {
+			/* Error injection: go to low drive */
+			cec_pin_low(pin);
+			pin->state = CEC_ST_RX_LOW_DRIVE;
+			pin->rx_low_drive_cnt++;
+			break;
+		}
+		pin->state = CEC_ST_RX_DATA_SAMPLE;
+		pin->ts = ts;
+		pin->rx_eom = false;
+		break;
+
+	case CEC_ST_RX_DATA_SAMPLE:
+		v = cec_pin_read(pin);
+		pin->state = CEC_ST_RX_DATA_POST_SAMPLE;
+		switch (pin->rx_bit % 10) {
+		default:
+			if (pin->rx_bit / 10 < CEC_MAX_MSG_SIZE)
+				pin->rx_msg.msg[pin->rx_bit / 10] |=
+					v << (7 - (pin->rx_bit % 10));
+			break;
+		case EOM_BIT:
+			pin->rx_eom = v;
+			pin->rx_msg.len = pin->rx_bit / 10 + 1;
+			break;
+		case ACK_BIT:
+			break;
+		}
+		pin->rx_bit++;
+		break;
+
+	case CEC_ST_RX_DATA_POST_SAMPLE:
+		pin->state = CEC_ST_RX_DATA_WAIT_FOR_LOW;
+		break;
+
+	case CEC_ST_RX_DATA_WAIT_FOR_LOW:
+		v = cec_pin_read(pin);
+		delta = ktime_us_delta(ts, pin->ts);
+		/*
+		 * Unfortunately the spec does not specify when to give up
+		 * and go to idle. We just pick TOTAL_LONG.
+		 */
+		if (v && delta > CEC_TIM_DATA_BIT_TOTAL_LONG) {
+			pin->rx_data_bit_too_long_cnt++;
+			cec_pin_to_idle(pin);
+			break;
+		}
+		if (v)
+			break;
+
+		if (rx_low_drive(pin)) {
+			/* Error injection: go to low drive */
+			cec_pin_low(pin);
+			pin->state = CEC_ST_RX_LOW_DRIVE;
+			pin->rx_low_drive_cnt++;
+			break;
+		}
+
+		/*
+		 * Go to low drive state when the total bit time is
+		 * too short.
+		 */
+		if (delta < CEC_TIM_DATA_BIT_TOTAL_MIN) {
+			if (!pin->rx_data_bit_too_short_cnt++) {
+				pin->rx_data_bit_too_short_ts = ktime_to_ns(pin->ts);
+				pin->rx_data_bit_too_short_delta = delta;
+			}
+			cec_pin_low(pin);
+			pin->state = CEC_ST_RX_LOW_DRIVE;
+			pin->rx_low_drive_cnt++;
+			break;
+		}
+		pin->ts = ts;
+		if (pin->rx_bit % 10 != 9) {
+			pin->state = CEC_ST_RX_DATA_SAMPLE;
+			break;
+		}
+
+		dest = cec_msg_destination(&pin->rx_msg);
+		bcast = dest == CEC_LOG_ADDR_BROADCAST;
+		/* for_us == broadcast or directed to us */
+		for_us = bcast || (pin->la_mask & (1 << dest));
+		/* ACK bit value */
+		ack = bcast ? 1 : !for_us;
+
+		if (for_us && rx_nack(pin)) {
+			/* Error injection: toggle the ACK bit */
+			ack = !ack;
+		}
+
+		if (ack) {
+			/* No need to write to the bus, just wait */
+			pin->state = CEC_ST_RX_ACK_HIGH_POST;
+			break;
+		}
+		cec_pin_low(pin);
+		pin->state = CEC_ST_RX_ACK_LOW;
+		break;
+
+	case CEC_ST_RX_ACK_LOW:
+		cec_pin_high(pin);
+		pin->state = CEC_ST_RX_ACK_LOW_POST;
+		break;
+
+	case CEC_ST_RX_ACK_LOW_POST:
+	case CEC_ST_RX_ACK_HIGH_POST:
+		v = cec_pin_read(pin);
+		if (v && pin->rx_eom) {
+			pin->work_rx_msg = pin->rx_msg;
+			pin->work_rx_msg.rx_ts = ktime_to_ns(ts);
+			wake_up_interruptible(&pin->kthread_waitq);
+			pin->ts = ts;
+			pin->state = CEC_ST_RX_ACK_FINISH;
+			break;
+		}
+		pin->rx_bit++;
+		pin->state = CEC_ST_RX_DATA_WAIT_FOR_LOW;
+		break;
+
+	case CEC_ST_RX_ACK_FINISH:
+		cec_pin_to_idle(pin);
+		break;
+
+	default:
+		break;
+	}
+}
+
+/*
+ * Main timer function
+ *
+ */
+static enum hrtimer_restart cec_pin_timer(struct hrtimer *timer)
+{
+	struct cec_pin *pin = container_of(timer, struct cec_pin, timer);
+	struct cec_adapter *adap = pin->adap;
+	ktime_t ts;
+	s32 delta;
+	u32 usecs;
+
+	ts = ktime_get();
+	if (ktime_to_ns(pin->timer_ts)) {
+		delta = ktime_us_delta(ts, pin->timer_ts);
+		pin->timer_cnt++;
+		if (delta > 100 && pin->state != CEC_ST_IDLE) {
+			/* Keep track of timer overruns */
+			pin->timer_sum_overrun += delta;
+			pin->timer_100us_overruns++;
+			if (delta > 300)
+				pin->timer_300us_overruns++;
+			if (delta > pin->timer_max_overrun)
+				pin->timer_max_overrun = delta;
+		}
+	}
+	if (adap->monitor_pin_cnt)
+		cec_pin_read(pin);
+
+	if (pin->wait_usecs) {
+		/*
+		 * If we are monitoring the pin, then we have to
+		 * sample at regular intervals.
+		 */
+		if (pin->wait_usecs > 150) {
+			pin->wait_usecs -= 100;
+			pin->timer_ts = ktime_add_us(ts, 100);
+			hrtimer_forward_now(timer, ns_to_ktime(100000));
+			return HRTIMER_RESTART;
+		}
+		if (pin->wait_usecs > 100) {
+			pin->wait_usecs /= 2;
+			pin->timer_ts = ktime_add_us(ts, pin->wait_usecs);
+			hrtimer_forward_now(timer,
+					ns_to_ktime(pin->wait_usecs * 1000));
+			return HRTIMER_RESTART;
+		}
+		pin->timer_ts = ktime_add_us(ts, pin->wait_usecs);
+		hrtimer_forward_now(timer,
+				    ns_to_ktime(pin->wait_usecs * 1000));
+		pin->wait_usecs = 0;
+		return HRTIMER_RESTART;
+	}
+
+	switch (pin->state) {
+	/* Transmit states */
+	case CEC_ST_TX_WAIT_FOR_HIGH:
+	case CEC_ST_TX_START_BIT_LOW:
+	case CEC_ST_TX_START_BIT_HIGH:
+	case CEC_ST_TX_START_BIT_HIGH_SHORT:
+	case CEC_ST_TX_START_BIT_HIGH_LONG:
+	case CEC_ST_TX_START_BIT_LOW_CUSTOM:
+	case CEC_ST_TX_START_BIT_HIGH_CUSTOM:
+	case CEC_ST_TX_DATA_BIT_0_LOW:
+	case CEC_ST_TX_DATA_BIT_0_HIGH:
+	case CEC_ST_TX_DATA_BIT_0_HIGH_SHORT:
+	case CEC_ST_TX_DATA_BIT_0_HIGH_LONG:
+	case CEC_ST_TX_DATA_BIT_1_LOW:
+	case CEC_ST_TX_DATA_BIT_1_HIGH:
+	case CEC_ST_TX_DATA_BIT_1_HIGH_SHORT:
+	case CEC_ST_TX_DATA_BIT_1_HIGH_LONG:
+	case CEC_ST_TX_DATA_BIT_1_HIGH_PRE_SAMPLE:
+	case CEC_ST_TX_DATA_BIT_1_HIGH_POST_SAMPLE:
+	case CEC_ST_TX_DATA_BIT_1_HIGH_POST_SAMPLE_SHORT:
+	case CEC_ST_TX_DATA_BIT_1_HIGH_POST_SAMPLE_LONG:
+	case CEC_ST_TX_DATA_BIT_LOW_CUSTOM:
+	case CEC_ST_TX_DATA_BIT_HIGH_CUSTOM:
+	case CEC_ST_TX_PULSE_LOW_CUSTOM:
+	case CEC_ST_TX_PULSE_HIGH_CUSTOM:
+		cec_pin_tx_states(pin, ts);
+		break;
+
+	/* Receive states */
+	case CEC_ST_RX_START_BIT_LOW:
+	case CEC_ST_RX_START_BIT_HIGH:
+	case CEC_ST_RX_DATA_SAMPLE:
+	case CEC_ST_RX_DATA_POST_SAMPLE:
+	case CEC_ST_RX_DATA_WAIT_FOR_LOW:
+	case CEC_ST_RX_ACK_LOW:
+	case CEC_ST_RX_ACK_LOW_POST:
+	case CEC_ST_RX_ACK_HIGH_POST:
+	case CEC_ST_RX_ACK_FINISH:
+		cec_pin_rx_states(pin, ts);
+		break;
+
+	case CEC_ST_IDLE:
+	case CEC_ST_TX_WAIT:
+		if (!cec_pin_high(pin)) {
+			/* Start bit, switch to receive state */
+			pin->ts = ts;
+			pin->state = CEC_ST_RX_START_BIT_LOW;
+			/*
+			 * If a transmit is pending, then that transmit should
+			 * use a signal free time of no more than
+			 * CEC_SIGNAL_FREE_TIME_NEW_INITIATOR since it will
+			 * have a new initiator due to the receive that is now
+			 * starting.
+			 */
+			if (pin->tx_msg.len && pin->tx_signal_free_time >
+			    CEC_SIGNAL_FREE_TIME_NEW_INITIATOR)
+				pin->tx_signal_free_time =
+					CEC_SIGNAL_FREE_TIME_NEW_INITIATOR;
+			break;
+		}
+		if (ktime_to_ns(pin->ts) == 0)
+			pin->ts = ts;
+		if (pin->tx_msg.len) {
+			/*
+			 * Check if the bus has been free for long enough
+			 * so we can kick off the pending transmit.
+			 */
+			delta = ktime_us_delta(ts, pin->ts);
+			if (delta / CEC_TIM_DATA_BIT_TOTAL >=
+			    pin->tx_signal_free_time) {
+				pin->tx_nacked = false;
+				if (tx_custom_start(pin))
+					pin->state = CEC_ST_TX_START_BIT_LOW_CUSTOM;
+				else
+					pin->state = CEC_ST_TX_START_BIT_LOW;
+				/* Generate start bit */
+				cec_pin_low(pin);
+				break;
+			}
+			if (delta / CEC_TIM_DATA_BIT_TOTAL >=
+			    pin->tx_signal_free_time - 1)
+				pin->state = CEC_ST_TX_WAIT;
+			break;
+		}
+		if (pin->tx_custom_pulse && pin->state == CEC_ST_IDLE) {
+			pin->tx_custom_pulse = false;
+			/* Generate custom pulse */
+			cec_pin_low(pin);
+			pin->state = CEC_ST_TX_PULSE_LOW_CUSTOM;
+			break;
+		}
+		if (pin->state != CEC_ST_IDLE || pin->ops->enable_irq == NULL ||
+		    pin->enable_irq_failed || adap->is_configuring ||
+		    adap->is_configured || adap->monitor_all_cnt)
+			break;
+		/* Switch to interrupt mode */
+		atomic_set(&pin->work_irq_change, CEC_PIN_IRQ_ENABLE);
+		pin->state = CEC_ST_RX_IRQ;
+		wake_up_interruptible(&pin->kthread_waitq);
+		return HRTIMER_NORESTART;
+
+	case CEC_ST_TX_LOW_DRIVE:
+	case CEC_ST_RX_LOW_DRIVE:
+		cec_pin_high(pin);
+		cec_pin_to_idle(pin);
+		break;
+
+	default:
+		break;
+	}
+
+	switch (pin->state) {
+	case CEC_ST_TX_START_BIT_LOW_CUSTOM:
+	case CEC_ST_TX_DATA_BIT_LOW_CUSTOM:
+	case CEC_ST_TX_PULSE_LOW_CUSTOM:
+		usecs = pin->tx_custom_low_usecs;
+		break;
+	case CEC_ST_TX_START_BIT_HIGH_CUSTOM:
+	case CEC_ST_TX_DATA_BIT_HIGH_CUSTOM:
+	case CEC_ST_TX_PULSE_HIGH_CUSTOM:
+		usecs = pin->tx_custom_high_usecs;
+		break;
+	default:
+		usecs = states[pin->state].usecs;
+		break;
+	}
+
+	if (!adap->monitor_pin_cnt || usecs <= 150) {
+		pin->wait_usecs = 0;
+		pin->timer_ts = ktime_add_us(ts, usecs);
+		hrtimer_forward_now(timer,
+				ns_to_ktime(usecs * 1000));
+		return HRTIMER_RESTART;
+	}
+	pin->wait_usecs = usecs - 100;
+	pin->timer_ts = ktime_add_us(ts, 100);
+	hrtimer_forward_now(timer, ns_to_ktime(100000));
+	return HRTIMER_RESTART;
+}
+
+static int cec_pin_thread_func(void *_adap)
+{
+	struct cec_adapter *adap = _adap;
+	struct cec_pin *pin = adap->pin;
+	bool irq_enabled = false;
+
+	for (;;) {
+		wait_event_interruptible(pin->kthread_waitq,
+					 kthread_should_stop() ||
+					 pin->work_rx_msg.len ||
+					 pin->work_tx_status ||
+					 atomic_read(&pin->work_irq_change) ||
+					 atomic_read(&pin->work_pin_num_events));
+
+		if (kthread_should_stop())
+			break;
+
+		if (pin->work_rx_msg.len) {
+			struct cec_msg *msg = &pin->work_rx_msg;
+
+			if (msg->len > 1 && msg->len < CEC_MAX_MSG_SIZE &&
+			    rx_add_byte(pin)) {
+				/* Error injection: add byte to the message */
+				msg->msg[msg->len++] = 0x55;
+			}
+			if (msg->len > 2 && rx_remove_byte(pin)) {
+				/* Error injection: remove byte from message */
+				msg->len--;
+			}
+			if (msg->len > CEC_MAX_MSG_SIZE)
+				msg->len = CEC_MAX_MSG_SIZE;
+			cec_received_msg_ts(adap, msg,
+				ns_to_ktime(pin->work_rx_msg.rx_ts));
+			msg->len = 0;
+		}
+
+		if (pin->work_tx_status) {
+			unsigned int tx_status = pin->work_tx_status;
+
+			pin->work_tx_status = 0;
+			cec_transmit_attempt_done_ts(adap, tx_status,
+						     pin->work_tx_ts);
+		}
+
+		while (atomic_read(&pin->work_pin_num_events)) {
+			unsigned int idx = pin->work_pin_events_rd;
+			u8 v = pin->work_pin_events[idx];
+
+			cec_queue_pin_cec_event(adap,
+						v & CEC_PIN_EVENT_FL_IS_HIGH,
+						v & CEC_PIN_EVENT_FL_DROPPED,
+						pin->work_pin_ts[idx]);
+			pin->work_pin_events_rd = (idx + 1) % CEC_NUM_PIN_EVENTS;
+			atomic_dec(&pin->work_pin_num_events);
+		}
+
+		switch (atomic_xchg(&pin->work_irq_change,
+				    CEC_PIN_IRQ_UNCHANGED)) {
+		case CEC_PIN_IRQ_DISABLE:
+			if (irq_enabled) {
+				call_void_pin_op(pin, disable_irq);
+				irq_enabled = false;
+			}
+			cec_pin_high(pin);
+			if (pin->state == CEC_ST_OFF)
+				break;
+			cec_pin_to_idle(pin);
+			hrtimer_start(&pin->timer, ns_to_ktime(0),
+				      HRTIMER_MODE_REL);
+			break;
+		case CEC_PIN_IRQ_ENABLE:
+			if (irq_enabled)
+				break;
+			pin->enable_irq_failed = !call_pin_op(pin, enable_irq);
+			if (pin->enable_irq_failed) {
+				cec_pin_to_idle(pin);
+				hrtimer_start(&pin->timer, ns_to_ktime(0),
+					      HRTIMER_MODE_REL);
+			} else {
+				irq_enabled = true;
+			}
+			break;
+		default:
+			break;
+		}
+	}
+	return 0;
+}
+
+static int cec_pin_adap_enable(struct cec_adapter *adap, bool enable)
+{
+	struct cec_pin *pin = adap->pin;
+
+	if (enable) {
+		cec_pin_read(pin);
+		cec_pin_to_idle(pin);
+		pin->tx_msg.len = 0;
+		pin->timer_ts = ns_to_ktime(0);
+		atomic_set(&pin->work_irq_change, CEC_PIN_IRQ_UNCHANGED);
+		if (!pin->kthread) {
+			pin->kthread = kthread_run(cec_pin_thread_func, adap,
+						   "cec-pin");
+			if (IS_ERR(pin->kthread)) {
+				int err = PTR_ERR(pin->kthread);
+
+				pr_err("cec-pin: kernel_thread() failed\n");
+				pin->kthread = NULL;
+				return err;
+			}
+		}
+		hrtimer_start(&pin->timer, ns_to_ktime(0),
+			      HRTIMER_MODE_REL);
+	} else if (pin->kthread) {
+		hrtimer_cancel(&pin->timer);
+		cec_pin_high(pin);
+		cec_pin_to_idle(pin);
+		pin->state = CEC_ST_OFF;
+		pin->work_tx_status = 0;
+		atomic_set(&pin->work_irq_change, CEC_PIN_IRQ_DISABLE);
+		wake_up_interruptible(&pin->kthread_waitq);
+	}
+	return 0;
+}
+
+static int cec_pin_adap_log_addr(struct cec_adapter *adap, u8 log_addr)
+{
+	struct cec_pin *pin = adap->pin;
+
+	if (log_addr == CEC_LOG_ADDR_INVALID)
+		pin->la_mask = 0;
+	else
+		pin->la_mask |= (1 << log_addr);
+	return 0;
+}
+
+void cec_pin_start_timer(struct cec_pin *pin)
+{
+	if (pin->state != CEC_ST_RX_IRQ)
+		return;
+
+	atomic_set(&pin->work_irq_change, CEC_PIN_IRQ_DISABLE);
+	wake_up_interruptible(&pin->kthread_waitq);
+}
+
+static int cec_pin_adap_transmit(struct cec_adapter *adap, u8 attempts,
+				      u32 signal_free_time, struct cec_msg *msg)
+{
+	struct cec_pin *pin = adap->pin;
+
+	/*
+	 * If a receive is in progress, then this transmit should use
+	 * a signal free time of max CEC_SIGNAL_FREE_TIME_NEW_INITIATOR
+	 * since when it starts transmitting it will have a new initiator.
+	 */
+	if (pin->state != CEC_ST_IDLE &&
+	    signal_free_time > CEC_SIGNAL_FREE_TIME_NEW_INITIATOR)
+		signal_free_time = CEC_SIGNAL_FREE_TIME_NEW_INITIATOR;
+
+	pin->tx_signal_free_time = signal_free_time;
+	pin->tx_extra_bytes = 0;
+	pin->tx_msg = *msg;
+	if (msg->len > 1) {
+		/* Error injection: add byte to the message */
+		pin->tx_extra_bytes = tx_add_bytes(pin);
+	}
+	if (msg->len > 2 && tx_remove_byte(pin)) {
+		/* Error injection: remove byte from the message */
+		pin->tx_msg.len--;
+	}
+	pin->work_tx_status = 0;
+	pin->tx_bit = 0;
+	cec_pin_start_timer(pin);
+	return 0;
+}
+
+static void cec_pin_adap_status(struct cec_adapter *adap,
+				       struct seq_file *file)
+{
+	struct cec_pin *pin = adap->pin;
+
+	seq_printf(file, "state: %s\n", states[pin->state].name);
+	seq_printf(file, "tx_bit: %d\n", pin->tx_bit);
+	seq_printf(file, "rx_bit: %d\n", pin->rx_bit);
+	seq_printf(file, "cec pin: %d\n", call_pin_op(pin, read));
+	seq_printf(file, "cec pin events dropped: %u\n",
+		   pin->work_pin_events_dropped_cnt);
+	seq_printf(file, "irq failed: %d\n", pin->enable_irq_failed);
+	if (pin->timer_100us_overruns) {
+		seq_printf(file, "timer overruns > 100us: %u of %u\n",
+			   pin->timer_100us_overruns, pin->timer_cnt);
+		seq_printf(file, "timer overruns > 300us: %u of %u\n",
+			   pin->timer_300us_overruns, pin->timer_cnt);
+		seq_printf(file, "max timer overrun: %u usecs\n",
+			   pin->timer_max_overrun);
+		seq_printf(file, "avg timer overrun: %u usecs\n",
+			   pin->timer_sum_overrun / pin->timer_100us_overruns);
+	}
+	if (pin->rx_start_bit_low_too_short_cnt)
+		seq_printf(file,
+			   "rx start bit low too short: %u (delta %u, ts %llu)\n",
+			   pin->rx_start_bit_low_too_short_cnt,
+			   pin->rx_start_bit_low_too_short_delta,
+			   pin->rx_start_bit_low_too_short_ts);
+	if (pin->rx_start_bit_too_short_cnt)
+		seq_printf(file,
+			   "rx start bit too short: %u (delta %u, ts %llu)\n",
+			   pin->rx_start_bit_too_short_cnt,
+			   pin->rx_start_bit_too_short_delta,
+			   pin->rx_start_bit_too_short_ts);
+	if (pin->rx_start_bit_too_long_cnt)
+		seq_printf(file, "rx start bit too long: %u\n",
+			   pin->rx_start_bit_too_long_cnt);
+	if (pin->rx_data_bit_too_short_cnt)
+		seq_printf(file,
+			   "rx data bit too short: %u (delta %u, ts %llu)\n",
+			   pin->rx_data_bit_too_short_cnt,
+			   pin->rx_data_bit_too_short_delta,
+			   pin->rx_data_bit_too_short_ts);
+	if (pin->rx_data_bit_too_long_cnt)
+		seq_printf(file, "rx data bit too long: %u\n",
+			   pin->rx_data_bit_too_long_cnt);
+	seq_printf(file, "rx initiated low drive: %u\n", pin->rx_low_drive_cnt);
+	seq_printf(file, "tx detected low drive: %u\n", pin->tx_low_drive_cnt);
+	pin->work_pin_events_dropped_cnt = 0;
+	pin->timer_cnt = 0;
+	pin->timer_100us_overruns = 0;
+	pin->timer_300us_overruns = 0;
+	pin->timer_max_overrun = 0;
+	pin->timer_sum_overrun = 0;
+	pin->rx_start_bit_low_too_short_cnt = 0;
+	pin->rx_start_bit_too_short_cnt = 0;
+	pin->rx_start_bit_too_long_cnt = 0;
+	pin->rx_data_bit_too_short_cnt = 0;
+	pin->rx_data_bit_too_long_cnt = 0;
+	pin->rx_low_drive_cnt = 0;
+	pin->tx_low_drive_cnt = 0;
+	call_void_pin_op(pin, status, file);
+}
+
+static int cec_pin_adap_monitor_all_enable(struct cec_adapter *adap,
+						  bool enable)
+{
+	struct cec_pin *pin = adap->pin;
+
+	pin->monitor_all = enable;
+	return 0;
+}
+
+static void cec_pin_adap_free(struct cec_adapter *adap)
+{
+	struct cec_pin *pin = adap->pin;
+
+	if (pin->kthread)
+		kthread_stop(pin->kthread);
+	pin->kthread = NULL;
+	if (pin->ops->free)
+		pin->ops->free(adap);
+	adap->pin = NULL;
+	kfree(pin);
+}
+
+static int cec_pin_received(struct cec_adapter *adap, struct cec_msg *msg)
+{
+	struct cec_pin *pin = adap->pin;
+
+	if (pin->ops->received && !adap->devnode.unregistered)
+		return pin->ops->received(adap, msg);
+	return -ENOMSG;
+}
+
+void cec_pin_changed(struct cec_adapter *adap, bool value)
+{
+	struct cec_pin *pin = adap->pin;
+
+	cec_pin_update(pin, value, false);
+	if (!value && (adap->is_configuring || adap->is_configured ||
+		       adap->monitor_all_cnt))
+		atomic_set(&pin->work_irq_change, CEC_PIN_IRQ_DISABLE);
+}
+EXPORT_SYMBOL_GPL(cec_pin_changed);
+
+static const struct cec_adap_ops cec_pin_adap_ops = {
+	.adap_enable = cec_pin_adap_enable,
+	.adap_monitor_all_enable = cec_pin_adap_monitor_all_enable,
+	.adap_log_addr = cec_pin_adap_log_addr,
+	.adap_transmit = cec_pin_adap_transmit,
+	.adap_status = cec_pin_adap_status,
+	.adap_free = cec_pin_adap_free,
+#ifdef CONFIG_CEC_PIN_ERROR_INJ
+	.error_inj_parse_line = cec_pin_error_inj_parse_line,
+	.error_inj_show = cec_pin_error_inj_show,
+#endif
+	.received = cec_pin_received,
+};
+
+struct cec_adapter *cec_pin_allocate_adapter(const struct cec_pin_ops *pin_ops,
+					void *priv, const char *name, u32 caps)
+{
+	struct cec_adapter *adap;
+	struct cec_pin *pin = kzalloc(sizeof(*pin), GFP_KERNEL);
+
+	if (pin == NULL)
+		return ERR_PTR(-ENOMEM);
+	pin->ops = pin_ops;
+	hrtimer_init(&pin->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
+	atomic_set(&pin->work_pin_num_events, 0);
+	pin->timer.function = cec_pin_timer;
+	init_waitqueue_head(&pin->kthread_waitq);
+	pin->tx_custom_low_usecs = CEC_TIM_CUSTOM_DEFAULT;
+	pin->tx_custom_high_usecs = CEC_TIM_CUSTOM_DEFAULT;
+
+	adap = cec_allocate_adapter(&cec_pin_adap_ops, priv, name,
+			    caps | CEC_CAP_MONITOR_ALL | CEC_CAP_MONITOR_PIN,
+			    CEC_MAX_LOG_ADDRS);
+
+	if (IS_ERR(adap)) {
+		kfree(pin);
+		return adap;
+	}
+
+	adap->pin = pin;
+	pin->adap = adap;
+	cec_pin_update(pin, cec_pin_high(pin), true);
+	return adap;
+}
+EXPORT_SYMBOL_GPL(cec_pin_allocate_adapter);
diff --git a/drivers/media/cec/core/cec-priv.h b/drivers/media/cec/core/cec-priv.h
new file mode 100644
index 000000000..ed1f8c676
--- /dev/null
+++ b/drivers/media/cec/core/cec-priv.h
@@ -0,0 +1,62 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * cec-priv.h - HDMI Consumer Electronics Control internal header
+ *
+ * Copyright 2016 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
+ */
+
+#ifndef _CEC_PRIV_H
+#define _CEC_PRIV_H
+
+#include <linux/cec-funcs.h>
+#include <media/cec-notifier.h>
+
+#define dprintk(lvl, fmt, arg...)					\
+	do {								\
+		if (lvl <= cec_debug)					\
+			pr_info("cec-%s: " fmt, adap->name, ## arg);	\
+	} while (0)
+
+#define call_op(adap, op, arg...)					\
+	((adap->ops->op && !adap->devnode.unregistered) ?		\
+	 adap->ops->op(adap, ## arg) : 0)
+
+#define call_void_op(adap, op, arg...)					\
+	do {								\
+		if (adap->ops->op && !adap->devnode.unregistered)	\
+			adap->ops->op(adap, ## arg);			\
+	} while (0)
+
+/* devnode to cec_adapter */
+#define to_cec_adapter(node) container_of(node, struct cec_adapter, devnode)
+
+static inline bool msg_is_raw(const struct cec_msg *msg)
+{
+	return msg->flags & CEC_MSG_FL_RAW;
+}
+
+/* cec-core.c */
+extern int cec_debug;
+int cec_get_device(struct cec_devnode *devnode);
+void cec_put_device(struct cec_devnode *devnode);
+
+/* cec-adap.c */
+int cec_monitor_all_cnt_inc(struct cec_adapter *adap);
+void cec_monitor_all_cnt_dec(struct cec_adapter *adap);
+int cec_monitor_pin_cnt_inc(struct cec_adapter *adap);
+void cec_monitor_pin_cnt_dec(struct cec_adapter *adap);
+int cec_adap_status(struct seq_file *file, void *priv);
+int cec_thread_func(void *_adap);
+int cec_adap_enable(struct cec_adapter *adap);
+void __cec_s_phys_addr(struct cec_adapter *adap, u16 phys_addr, bool block);
+int __cec_s_log_addrs(struct cec_adapter *adap,
+		      struct cec_log_addrs *log_addrs, bool block);
+int cec_transmit_msg_fh(struct cec_adapter *adap, struct cec_msg *msg,
+			struct cec_fh *fh, bool block);
+void cec_queue_event_fh(struct cec_fh *fh,
+			const struct cec_event *new_ev, u64 ts);
+
+/* cec-api.c */
+extern const struct file_operations cec_devnode_fops;
+
+#endif