v4.19.13 snapshot.
diff --git a/drivers/media/cec/Kconfig b/drivers/media/cec/Kconfig
new file mode 100644
index 0000000..9c2b108
--- /dev/null
+++ b/drivers/media/cec/Kconfig
@@ -0,0 +1,12 @@
+config MEDIA_CEC_RC
+ bool "HDMI CEC RC integration"
+ depends on CEC_CORE && RC_CORE
+ depends on CEC_CORE=m || RC_CORE=y
+ ---help---
+ Pass on CEC remote control messages to the RC framework.
+
+config CEC_PIN_ERROR_INJ
+ bool "Enable CEC error injection support"
+ depends on CEC_PIN && DEBUG_FS
+ ---help---
+ This option enables CEC error injection using debugfs.
diff --git a/drivers/media/cec/Makefile b/drivers/media/cec/Makefile
new file mode 100644
index 0000000..29a2ab9
--- /dev/null
+++ b/drivers/media/cec/Makefile
@@ -0,0 +1,16 @@
+# SPDX-License-Identifier: GPL-2.0
+cec-objs := cec-core.o cec-adap.o cec-api.o cec-edid.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/cec-adap.c b/drivers/media/cec/cec-adap.c
new file mode 100644
index 0000000..a537e51
--- /dev/null
+++ b/drivers/media/cec/cec-adap.c
@@ -0,0 +1,2086 @@
+// 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_edid.h>
+
+#include "cec-priv.h"
+
+static void cec_fill_msg_report_features(struct cec_adapter *adap,
+ struct cec_msg *msg,
+ unsigned int la_idx);
+
+/*
+ * 400 ms is the time it takes for one 16 byte message to be
+ * transferred and 5 is the maximum number of retries. Add
+ * another 100 ms as a margin. So if the transmit doesn't
+ * finish before that time something is really wrong and we
+ * have to time out.
+ *
+ * This is a sign that something it really wrong and a warning
+ * will be issued.
+ */
+#define CEC_XFER_TIMEOUT_MS (5 * 400 + 100)
+
+#define call_op(adap, op, arg...) \
+ (adap->ops->op ? adap->ops->op(adap, ## arg) : 0)
+
+#define call_void_op(adap, op, arg...) \
+ do { \
+ if (adap->ops->op) \
+ adap->ops->op(adap, ## arg); \
+ } while (0)
+
+static int cec_log_addr2idx(const struct cec_adapter *adap, u8 log_addr)
+{
+ int i;
+
+ for (i = 0; i < adap->log_addrs.num_log_addrs; i++)
+ if (adap->log_addrs.log_addr[i] == log_addr)
+ return i;
+ return -1;
+}
+
+static unsigned int cec_log_addr2dev(const struct cec_adapter *adap, u8 log_addr)
+{
+ int i = cec_log_addr2idx(adap, log_addr);
+
+ return adap->log_addrs.primary_device_type[i < 0 ? 0 : i];
+}
+
+/*
+ * Queue a new event for this filehandle. If ts == 0, then set it
+ * to the current time.
+ *
+ * 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);
+ list_for_each_entry(fh, &adap->devnode.fhs, list)
+ cec_queue_event_fh(fh, ev, ts);
+ mutex_unlock(&adap->devnode.lock);
+}
+
+/* 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);
+ 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);
+}
+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);
+ list_for_each_entry(fh, &adap->devnode.fhs, list)
+ cec_queue_event_fh(fh, &ev, ktime_to_ns(ts));
+ mutex_unlock(&adap->devnode.lock);
+}
+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);
+ list_for_each_entry(fh, &adap->devnode.fhs, list)
+ cec_queue_event_fh(fh, &ev, ktime_to_ns(ts));
+ mutex_unlock(&adap->devnode.lock);
+}
+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);
+ 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);
+}
+
+/*
+ * 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);
+ 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);
+}
+
+/* Notify userspace of an adapter state change. */
+static void cec_post_state_event(struct cec_adapter *adap)
+{
+ struct cec_event ev = {
+ .event = CEC_EVENT_STATE_CHANGE,
+ };
+
+ ev.state_change.phys_addr = adap->phys_addr;
+ ev.state_change.log_addr_mask = adap->log_addrs.log_addr_mask;
+ cec_queue_event(adap, &ev);
+}
+
+/*
+ * A CEC transmit (and a possible wait for reply) completed.
+ * If this was in blocking mode, then complete it, otherwise
+ * queue the message for userspace to dequeue later.
+ *
+ * This function is called with adap->lock held.
+ */
+static void cec_data_completed(struct cec_data *data)
+{
+ /*
+ * Delete this transmit from the filehandle's xfer_list since
+ * we're done with it.
+ *
+ * Note that if the filehandle is closed before this transmit
+ * finished, then the release() function will set data->fh to NULL.
+ * Without that we would be referring to a closed filehandle.
+ */
+ if (data->fh)
+ list_del(&data->xfer_list);
+
+ if (data->blocking) {
+ /*
+ * Someone is blocking so mark the message as completed
+ * and call complete.
+ */
+ data->completed = true;
+ complete(&data->c);
+ } else {
+ /*
+ * No blocking, so just queue the message if needed and
+ * free the memory.
+ */
+ if (data->fh)
+ cec_queue_msg_fh(data->fh, &data->msg);
+ kfree(data);
+ }
+}
+
+/*
+ * A pending CEC transmit needs to be cancelled, either because the CEC
+ * adapter is disabled or the transmit takes an impossibly long time to
+ * finish.
+ *
+ * This function is called with adap->lock held.
+ */
+static void cec_data_cancel(struct cec_data *data, u8 tx_status)
+{
+ /*
+ * It's either the current transmit, or it is a pending
+ * transmit. Take the appropriate action to clear it.
+ */
+ if (data->adap->transmitting == data) {
+ data->adap->transmitting = NULL;
+ } else {
+ list_del_init(&data->list);
+ if (!(data->msg.tx_status & CEC_TX_STATUS_OK))
+ data->adap->transmit_queue_sz--;
+ }
+
+ if (data->msg.tx_status & CEC_TX_STATUS_OK) {
+ data->msg.rx_ts = ktime_get_ns();
+ data->msg.rx_status = CEC_RX_STATUS_ABORTED;
+ } 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;
+ }
+
+ /* Queue transmitted message for monitoring purposes */
+ cec_queue_msg_monitor(data->adap, &data->msg, 1);
+
+ 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);
+ }
+ if (adap->transmitting)
+ cec_data_cancel(adap->transmitting, CEC_TX_STATUS_ABORTED);
+
+ /* 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);
+ /*
+ * 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.
+ */
+ }
+}
+
+/*
+ * Main CEC state machine
+ *
+ * Wait until the thread should be stopped, or we are not transmitting and
+ * a new transmit message is queued up, in which case we start transmitting
+ * that message. When the adapter finished transmitting the message it will
+ * call cec_transmit_done().
+ *
+ * If the adapter is disabled, then remove all queued messages instead.
+ *
+ * If the current transmit times out, then cancel that transmit.
+ */
+int cec_thread_func(void *_adap)
+{
+ struct cec_adapter *adap = _adap;
+
+ for (;;) {
+ unsigned int signal_free_time;
+ struct cec_data *data;
+ bool timeout = false;
+ u8 attempts;
+
+ if (adap->transmitting) {
+ int err;
+
+ /*
+ * We are transmitting a message, so add a timeout
+ * to prevent the state machine to get stuck waiting
+ * for this message to finalize and add a check to
+ * see if the adapter is disabled in which case the
+ * transmit should be canceled.
+ */
+ err = wait_event_interruptible_timeout(adap->kthread_waitq,
+ (adap->needs_hpd &&
+ (!adap->is_configured && !adap->is_configuring)) ||
+ kthread_should_stop() ||
+ (!adap->transmitting &&
+ !list_empty(&adap->transmit_queue)),
+ msecs_to_jiffies(CEC_XFER_TIMEOUT_MS));
+ timeout = err == 0;
+ } else {
+ /* Otherwise we just wait for something to happen. */
+ wait_event_interruptible(adap->kthread_waitq,
+ kthread_should_stop() ||
+ (!adap->transmitting &&
+ !list_empty(&adap->transmit_queue)));
+ }
+
+ mutex_lock(&adap->lock);
+
+ if ((adap->needs_hpd &&
+ (!adap->is_configured && !adap->is_configuring)) ||
+ kthread_should_stop()) {
+ cec_flush(adap);
+ goto unlock;
+ }
+
+ if (adap->transmitting && 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 CEC_XFER_TIMEOUT_MS (2.1s).
+ */
+ pr_warn("cec-%s: message %*ph timed out\n", adap->name,
+ adap->transmitting->msg.len,
+ adap->transmitting->msg.msg);
+ adap->tx_timeouts++;
+ /* Just give up on this. */
+ cec_data_cancel(adap->transmitting,
+ CEC_TX_STATUS_TIMEOUT);
+ goto unlock;
+ }
+
+ /*
+ * If we are still transmitting, or there is nothing new to
+ * transmit, then just continue waiting.
+ */
+ if (adap->transmitting || list_empty(&adap->transmit_queue))
+ goto unlock;
+
+ /* Get a new message to transmit */
+ data = list_first_entry(&adap->transmit_queue,
+ struct cec_data, list);
+ list_del_init(&data->list);
+ 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;
+
+ /* Tell the adapter to transmit, cancel on error */
+ if (adap->ops->adap_transmit(adap, data->attempts,
+ signal_free_time, &data->msg))
+ cec_data_cancel(data, CEC_TX_STATUS_ABORTED);
+
+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;
+
+ 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 can happen if a transmit was issued and the cable is
+ * unplugged while the transmit is ongoing. Ignore this
+ * transmit in that case.
+ */
+ dprintk(1, "%s was called without an ongoing transmit!\n",
+ __func__);
+ goto unlock;
+ }
+
+ 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 (data->attempts > attempts_made &&
+ !(status & (CEC_TX_STATUS_MAX_RETRIES | CEC_TX_STATUS_OK))) {
+ /* 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;
+ }
+
+ 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);
+unlock:
+ 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);
+ data->msg.rx_ts = ktime_get_ns();
+ data->msg.rx_status = CEC_RX_STATUS_TIMEOUT;
+ cec_data_completed(data);
+unlock:
+ mutex_unlock(&adap->lock);
+}
+
+/*
+ * Transmit a message. The fh argument may be NULL if the transmit is not
+ * associated with a specific filehandle.
+ *
+ * This function is called with adap->lock held.
+ */
+int cec_transmit_msg_fh(struct cec_adapter *adap, struct cec_msg *msg,
+ struct cec_fh *fh, bool block)
+{
+ struct cec_data *data;
+
+ 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;
+ }
+ if (msg->timeout)
+ msg->flags &= CEC_MSG_FL_REPLY_TO_FOLLOWERS;
+ else
+ msg->flags = 0;
+
+ if (msg->len > 1 && msg->msg[1] == CEC_MSG_CDC_MESSAGE) {
+ msg->msg[2] = adap->phys_addr >> 8;
+ msg->msg[3] = adap->phys_addr & 0xff;
+ }
+
+ /* 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 (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;
+ }
+ if (!adap->is_configured && !adap->is_configuring) {
+ if (adap->needs_hpd || msg->msg[0] != 0xf0) {
+ dprintk(1, "%s: adapter is unconfigured\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(1, "%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);
+
+ 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)
+ cec_data_cancel(data, CEC_TX_STATUS_ABORTED);
+
+ /* The transmit completed (possibly with an error) */
+ *msg = data->msg;
+ kfree(data);
+ return 0;
+}
+
+/* Helper function to be used by drivers and this framework. */
+int cec_transmit_msg(struct cec_adapter *adap, struct cec_msg *msg,
+ bool block)
+{
+ int ret;
+
+ mutex_lock(&adap->lock);
+ ret = cec_transmit_msg_fh(adap, msg, NULL, block);
+ mutex_unlock(&adap->lock);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(cec_transmit_msg);
+
+/*
+ * I don't like forward references but without this the low-level
+ * cec_received_msg() function would come after a bunch of high-level
+ * CEC protocol handling functions. That was very confusing.
+ */
+static int cec_receive_notify(struct cec_adapter *adap, struct cec_msg *msg,
+ bool is_reply);
+
+#define DIRECTED 0x80
+#define BCAST1_4 0x40
+#define BCAST2_0 0x20 /* broadcast only allowed for >= 2.0 */
+#define BCAST (BCAST1_4 | BCAST2_0)
+#define BOTH (BCAST | DIRECTED)
+
+/*
+ * Specify minimum length and whether the message is directed, broadcast
+ * or both. Messages that do not match the criteria are ignored as per
+ * the CEC specification.
+ */
+static const u8 cec_msg_size[256] = {
+ [CEC_MSG_ACTIVE_SOURCE] = 4 | BCAST,
+ [CEC_MSG_IMAGE_VIEW_ON] = 2 | DIRECTED,
+ [CEC_MSG_TEXT_VIEW_ON] = 2 | DIRECTED,
+ [CEC_MSG_INACTIVE_SOURCE] = 4 | DIRECTED,
+ [CEC_MSG_REQUEST_ACTIVE_SOURCE] = 2 | BCAST,
+ [CEC_MSG_ROUTING_CHANGE] = 6 | BCAST,
+ [CEC_MSG_ROUTING_INFORMATION] = 4 | BCAST,
+ [CEC_MSG_SET_STREAM_PATH] = 4 | BCAST,
+ [CEC_MSG_STANDBY] = 2 | BOTH,
+ [CEC_MSG_RECORD_OFF] = 2 | DIRECTED,
+ [CEC_MSG_RECORD_ON] = 3 | DIRECTED,
+ [CEC_MSG_RECORD_STATUS] = 3 | DIRECTED,
+ [CEC_MSG_RECORD_TV_SCREEN] = 2 | DIRECTED,
+ [CEC_MSG_CLEAR_ANALOGUE_TIMER] = 13 | DIRECTED,
+ [CEC_MSG_CLEAR_DIGITAL_TIMER] = 16 | DIRECTED,
+ [CEC_MSG_CLEAR_EXT_TIMER] = 13 | DIRECTED,
+ [CEC_MSG_SET_ANALOGUE_TIMER] = 13 | DIRECTED,
+ [CEC_MSG_SET_DIGITAL_TIMER] = 16 | DIRECTED,
+ [CEC_MSG_SET_EXT_TIMER] = 13 | DIRECTED,
+ [CEC_MSG_SET_TIMER_PROGRAM_TITLE] = 2 | DIRECTED,
+ [CEC_MSG_TIMER_CLEARED_STATUS] = 3 | DIRECTED,
+ [CEC_MSG_TIMER_STATUS] = 3 | DIRECTED,
+ [CEC_MSG_CEC_VERSION] = 3 | DIRECTED,
+ [CEC_MSG_GET_CEC_VERSION] = 2 | DIRECTED,
+ [CEC_MSG_GIVE_PHYSICAL_ADDR] = 2 | DIRECTED,
+ [CEC_MSG_GET_MENU_LANGUAGE] = 2 | DIRECTED,
+ [CEC_MSG_REPORT_PHYSICAL_ADDR] = 5 | BCAST,
+ [CEC_MSG_SET_MENU_LANGUAGE] = 5 | BCAST,
+ [CEC_MSG_REPORT_FEATURES] = 6 | BCAST,
+ [CEC_MSG_GIVE_FEATURES] = 2 | DIRECTED,
+ [CEC_MSG_DECK_CONTROL] = 3 | DIRECTED,
+ [CEC_MSG_DECK_STATUS] = 3 | DIRECTED,
+ [CEC_MSG_GIVE_DECK_STATUS] = 3 | DIRECTED,
+ [CEC_MSG_PLAY] = 3 | DIRECTED,
+ [CEC_MSG_GIVE_TUNER_DEVICE_STATUS] = 3 | DIRECTED,
+ [CEC_MSG_SELECT_ANALOGUE_SERVICE] = 6 | DIRECTED,
+ [CEC_MSG_SELECT_DIGITAL_SERVICE] = 9 | DIRECTED,
+ [CEC_MSG_TUNER_DEVICE_STATUS] = 7 | DIRECTED,
+ [CEC_MSG_TUNER_STEP_DECREMENT] = 2 | DIRECTED,
+ [CEC_MSG_TUNER_STEP_INCREMENT] = 2 | DIRECTED,
+ [CEC_MSG_DEVICE_VENDOR_ID] = 5 | BCAST,
+ [CEC_MSG_GIVE_DEVICE_VENDOR_ID] = 2 | DIRECTED,
+ [CEC_MSG_VENDOR_COMMAND] = 2 | DIRECTED,
+ [CEC_MSG_VENDOR_COMMAND_WITH_ID] = 5 | BOTH,
+ [CEC_MSG_VENDOR_REMOTE_BUTTON_DOWN] = 2 | BOTH,
+ [CEC_MSG_VENDOR_REMOTE_BUTTON_UP] = 2 | BOTH,
+ [CEC_MSG_SET_OSD_STRING] = 3 | DIRECTED,
+ [CEC_MSG_GIVE_OSD_NAME] = 2 | DIRECTED,
+ [CEC_MSG_SET_OSD_NAME] = 2 | DIRECTED,
+ [CEC_MSG_MENU_REQUEST] = 3 | DIRECTED,
+ [CEC_MSG_MENU_STATUS] = 3 | DIRECTED,
+ [CEC_MSG_USER_CONTROL_PRESSED] = 3 | DIRECTED,
+ [CEC_MSG_USER_CONTROL_RELEASED] = 2 | DIRECTED,
+ [CEC_MSG_GIVE_DEVICE_POWER_STATUS] = 2 | DIRECTED,
+ [CEC_MSG_REPORT_POWER_STATUS] = 3 | DIRECTED | BCAST2_0,
+ [CEC_MSG_FEATURE_ABORT] = 4 | DIRECTED,
+ [CEC_MSG_ABORT] = 2 | DIRECTED,
+ [CEC_MSG_GIVE_AUDIO_STATUS] = 2 | DIRECTED,
+ [CEC_MSG_GIVE_SYSTEM_AUDIO_MODE_STATUS] = 2 | DIRECTED,
+ [CEC_MSG_REPORT_AUDIO_STATUS] = 3 | DIRECTED,
+ [CEC_MSG_REPORT_SHORT_AUDIO_DESCRIPTOR] = 2 | DIRECTED,
+ [CEC_MSG_REQUEST_SHORT_AUDIO_DESCRIPTOR] = 2 | DIRECTED,
+ [CEC_MSG_SET_SYSTEM_AUDIO_MODE] = 3 | BOTH,
+ [CEC_MSG_SYSTEM_AUDIO_MODE_REQUEST] = 2 | DIRECTED,
+ [CEC_MSG_SYSTEM_AUDIO_MODE_STATUS] = 3 | DIRECTED,
+ [CEC_MSG_SET_AUDIO_RATE] = 3 | DIRECTED,
+ [CEC_MSG_INITIATE_ARC] = 2 | DIRECTED,
+ [CEC_MSG_REPORT_ARC_INITIATED] = 2 | DIRECTED,
+ [CEC_MSG_REPORT_ARC_TERMINATED] = 2 | DIRECTED,
+ [CEC_MSG_REQUEST_ARC_INITIATION] = 2 | DIRECTED,
+ [CEC_MSG_REQUEST_ARC_TERMINATION] = 2 | DIRECTED,
+ [CEC_MSG_TERMINATE_ARC] = 2 | DIRECTED,
+ [CEC_MSG_REQUEST_CURRENT_LATENCY] = 4 | BCAST,
+ [CEC_MSG_REPORT_CURRENT_LATENCY] = 6 | BCAST,
+ [CEC_MSG_CDC_MESSAGE] = 2 | BCAST,
+};
+
+/* Called by the CEC adapter if a message is received */
+void cec_received_msg_ts(struct cec_adapter *adap,
+ struct cec_msg *msg, ktime_t ts)
+{
+ struct cec_data *data;
+ u8 msg_init = cec_msg_initiator(msg);
+ u8 msg_dest = cec_msg_destination(msg);
+ u8 cmd = msg->msg[1];
+ bool is_reply = false;
+ bool valid_la = true;
+ u8 min_len = 0;
+
+ if (WARN_ON(!msg->len || msg->len > CEC_MAX_MSG_SIZE))
+ return;
+
+ /*
+ * Some CEC adapters will receive the messages that they transmitted.
+ * This test filters out those messages by checking if we are the
+ * initiator, and just returning in that case.
+ *
+ * Note that this won't work if this is an Unregistered device.
+ *
+ * It is bad practice if the hardware receives the message that it
+ * transmitted and luckily most CEC adapters behave correctly in this
+ * respect.
+ */
+ if (msg_init != CEC_LOG_ADDR_UNREGISTERED &&
+ cec_has_log_addr(adap, msg_init))
+ return;
+
+ msg->rx_ts = ktime_to_ns(ts);
+ msg->rx_status = CEC_RX_STATUS_OK;
+ msg->sequence = msg->reply = msg->timeout = 0;
+ msg->tx_status = 0;
+ msg->tx_ts = 0;
+ msg->tx_arb_lost_cnt = 0;
+ msg->tx_nack_cnt = 0;
+ msg->tx_low_drive_cnt = 0;
+ msg->tx_error_cnt = 0;
+ msg->flags = 0;
+ memset(msg->msg + msg->len, 0, sizeof(msg->msg) - msg->len);
+
+ mutex_lock(&adap->lock);
+ dprintk(2, "%s: %*ph\n", __func__, msg->len, msg->msg);
+
+ adap->last_initiator = 0xff;
+
+ /* Check if this message was for us (directed or broadcast). */
+ if (!cec_msg_is_broadcast(msg))
+ valid_la = cec_has_log_addr(adap, msg_dest);
+
+ /*
+ * Check if the length is not too short or if the message is a
+ * broadcast message where a directed message was expected or
+ * vice versa. If so, then the message has to be ignored (according
+ * to section CEC 7.3 and CEC 12.2).
+ */
+ if (valid_la && msg->len > 1 && cec_msg_size[cmd]) {
+ u8 dir_fl = cec_msg_size[cmd] & BOTH;
+
+ min_len = cec_msg_size[cmd] & 0x1f;
+ if (msg->len < min_len)
+ valid_la = false;
+ else if (!cec_msg_is_broadcast(msg) && !(dir_fl & DIRECTED))
+ valid_la = false;
+ else if (cec_msg_is_broadcast(msg) && !(dir_fl & BCAST1_4))
+ valid_la = false;
+ else if (cec_msg_is_broadcast(msg) &&
+ adap->log_addrs.cec_version >= CEC_OP_CEC_VERSION_2_0 &&
+ !(dir_fl & BCAST2_0))
+ 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;
+ /* Remove it from the wait_queue */
+ list_del_init(&data->list);
+
+ /* Cancel the pending timeout work */
+ if (!cancel_delayed_work(&data->work)) {
+ mutex_unlock(&adap->lock);
+ flush_scheduled_work();
+ mutex_lock(&adap->lock);
+ }
+ /*
+ * Mark this as a reply, provided someone is still
+ * waiting for the answer.
+ */
+ if (data->fh)
+ is_reply = true;
+ cec_data_completed(data);
+ break;
+ }
+ }
+ mutex_unlock(&adap->lock);
+
+ /* Pass the message on to any monitoring filehandles */
+ cec_queue_msg_monitor(adap, msg, valid_la);
+
+ /* We're done if it is not for us or a poll message */
+ if (!valid_la || msg->len <= 1)
+ return;
+
+ 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->is_configuring)
+ return -EINTR;
+
+ if (err)
+ return err;
+
+ /*
+ * The message was aborted due to a disconnect or
+ * unconfigure, just bail out.
+ */
+ if (msg.tx_status & CEC_TX_STATUS_ABORTED)
+ 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
+ * 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)
+ return 0;
+
+ /*
+ * Message not acknowledged, so this logical
+ * address is free to use.
+ */
+ err = adap->ops->adap_log_addr(adap, log_addr);
+ if (err)
+ return err;
+
+ las->log_addr[idx] = log_addr;
+ las->log_addr_mask |= 1 << log_addr;
+ adap->phys_addrs[log_addr] = adap->phys_addr;
+ 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(adap->ops->adap_log_addr(adap, CEC_LOG_ADDR_INVALID));
+ adap->log_addrs.log_addr_mask = 0;
+ adap->is_configuring = false;
+ adap->is_configured = false;
+ memset(adap->phys_addrs, 0xff, sizeof(adap->phys_addrs));
+ cec_flush(adap);
+ wake_up_interruptible(&adap->kthread_waitq);
+ cec_post_state_event(adap);
+}
+
+/*
+ * Attempt to claim the required logical addresses.
+ */
+static int cec_config_thread_func(void *arg)
+{
+ /* The various LAs for each type of device */
+ static const u8 tv_log_addrs[] = {
+ CEC_LOG_ADDR_TV, CEC_LOG_ADDR_SPECIFIC,
+ CEC_LOG_ADDR_INVALID
+ };
+ static const u8 record_log_addrs[] = {
+ CEC_LOG_ADDR_RECORD_1, CEC_LOG_ADDR_RECORD_2,
+ CEC_LOG_ADDR_RECORD_3,
+ CEC_LOG_ADDR_BACKUP_1, CEC_LOG_ADDR_BACKUP_2,
+ CEC_LOG_ADDR_INVALID
+ };
+ static const u8 tuner_log_addrs[] = {
+ CEC_LOG_ADDR_TUNER_1, CEC_LOG_ADDR_TUNER_2,
+ CEC_LOG_ADDR_TUNER_3, CEC_LOG_ADDR_TUNER_4,
+ CEC_LOG_ADDR_BACKUP_1, CEC_LOG_ADDR_BACKUP_2,
+ CEC_LOG_ADDR_INVALID
+ };
+ static const u8 playback_log_addrs[] = {
+ CEC_LOG_ADDR_PLAYBACK_1, CEC_LOG_ADDR_PLAYBACK_2,
+ CEC_LOG_ADDR_PLAYBACK_3,
+ CEC_LOG_ADDR_BACKUP_1, CEC_LOG_ADDR_BACKUP_2,
+ CEC_LOG_ADDR_INVALID
+ };
+ static const u8 audiosystem_log_addrs[] = {
+ CEC_LOG_ADDR_AUDIOSYSTEM,
+ CEC_LOG_ADDR_INVALID
+ };
+ static const u8 specific_use_log_addrs[] = {
+ CEC_LOG_ADDR_SPECIFIC,
+ CEC_LOG_ADDR_BACKUP_1, CEC_LOG_ADDR_BACKUP_2,
+ CEC_LOG_ADDR_INVALID
+ };
+ static const u8 *type2addrs[6] = {
+ [CEC_LOG_ADDR_TYPE_TV] = tv_log_addrs,
+ [CEC_LOG_ADDR_TYPE_RECORD] = record_log_addrs,
+ [CEC_LOG_ADDR_TYPE_TUNER] = tuner_log_addrs,
+ [CEC_LOG_ADDR_TYPE_PLAYBACK] = playback_log_addrs,
+ [CEC_LOG_ADDR_TYPE_AUDIOSYSTEM] = audiosystem_log_addrs,
+ [CEC_LOG_ADDR_TYPE_SPECIFIC] = specific_use_log_addrs,
+ };
+ static const u16 type2mask[] = {
+ [CEC_LOG_ADDR_TYPE_TV] = CEC_LOG_ADDR_MASK_TV,
+ [CEC_LOG_ADDR_TYPE_RECORD] = CEC_LOG_ADDR_MASK_RECORD,
+ [CEC_LOG_ADDR_TYPE_TUNER] = CEC_LOG_ADDR_MASK_TUNER,
+ [CEC_LOG_ADDR_TYPE_PLAYBACK] = CEC_LOG_ADDR_MASK_PLAYBACK,
+ [CEC_LOG_ADDR_TYPE_AUDIOSYSTEM] = CEC_LOG_ADDR_MASK_AUDIOSYSTEM,
+ [CEC_LOG_ADDR_TYPE_SPECIFIC] = CEC_LOG_ADDR_MASK_SPECIFIC,
+ };
+ struct cec_adapter *adap = arg;
+ struct cec_log_addrs *las = &adap->log_addrs;
+ int err;
+ int i, j;
+
+ mutex_lock(&adap->lock);
+ dprintk(1, "physical address: %x.%x.%x.%x, claim %d logical addresses\n",
+ cec_phys_addr_exp(adap->phys_addr), las->num_log_addrs);
+ las->log_addr_mask = 0;
+
+ if (las->log_addr_type[0] == CEC_LOG_ADDR_TYPE_UNREGISTERED)
+ goto configured;
+
+ for (i = 0; i < las->num_log_addrs; i++) {
+ unsigned int type = las->log_addr_type[i];
+ const u8 *la_list;
+ u8 last_la;
+
+ /*
+ * The TV functionality can only map to physical address 0.
+ * For any other address, try the Specific functionality
+ * instead as per the spec.
+ */
+ if (adap->phys_addr && type == CEC_LOG_ADDR_TYPE_TV)
+ type = CEC_LOG_ADDR_TYPE_SPECIFIC;
+
+ la_list = type2addrs[type];
+ last_la = las->log_addr[i];
+ las->log_addr[i] = CEC_LOG_ADDR_INVALID;
+ if (last_la == CEC_LOG_ADDR_INVALID ||
+ last_la == CEC_LOG_ADDR_UNREGISTERED ||
+ !((1 << last_la) & type2mask[type]))
+ last_la = la_list[0];
+
+ err = cec_config_log_addr(adap, i, last_la);
+ if (err > 0) /* Reused last LA */
+ continue;
+
+ if (err < 0)
+ goto unconfigure;
+
+ for (j = 0; la_list[j] != CEC_LOG_ADDR_INVALID; j++) {
+ /* Tried this one already, skip it */
+ if (la_list[j] == last_la)
+ continue;
+ /* The backup addresses are CEC 2.0 specific */
+ if ((la_list[j] == CEC_LOG_ADDR_BACKUP_1 ||
+ la_list[j] == CEC_LOG_ADDR_BACKUP_2) &&
+ las->cec_version < CEC_OP_CEC_VERSION_2_0)
+ continue;
+
+ err = cec_config_log_addr(adap, i, la_list[j]);
+ if (err == 0) /* LA is in use */
+ continue;
+ if (err < 0)
+ goto unconfigure;
+ /* Done, claimed an LA */
+ break;
+ }
+
+ if (la_list[j] == CEC_LOG_ADDR_INVALID)
+ dprintk(1, "could not claim LA %d\n", i);
+ }
+
+ 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;
+ 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);
+ }
+ adap->kthread_config = NULL;
+ complete(&adap->config_completion);
+ mutex_unlock(&adap->lock);
+ return 0;
+
+unconfigure:
+ for (i = 0; i < las->num_log_addrs; i++)
+ las->log_addr[i] = CEC_LOG_ADDR_INVALID;
+ cec_adap_unconfigure(adap);
+ adap->kthread_config = NULL;
+ mutex_unlock(&adap->lock);
+ complete(&adap->config_completion);
+ return 0;
+}
+
+/*
+ * Called from either __cec_s_phys_addr or __cec_s_log_addrs to claim the
+ * logical addresses.
+ *
+ * This function is called with adap->lock held.
+ */
+static void cec_claim_log_addrs(struct cec_adapter *adap, bool block)
+{
+ if (WARN_ON(adap->is_configuring || adap->is_configured))
+ return;
+
+ init_completion(&adap->config_completion);
+
+ /* Ready to kick off the thread */
+ adap->is_configuring = true;
+ adap->kthread_config = kthread_run(cec_config_thread_func, adap,
+ "ceccfg-%s", adap->name);
+ if (IS_ERR(adap->kthread_config)) {
+ adap->kthread_config = NULL;
+ } else if (block) {
+ mutex_unlock(&adap->lock);
+ wait_for_completion(&adap->config_completion);
+ mutex_lock(&adap->lock);
+ }
+}
+
+/* Set a new physical address and send an event notifying userspace of this.
+ *
+ * This function is called with adap->lock held.
+ */
+void __cec_s_phys_addr(struct cec_adapter *adap, u16 phys_addr, bool block)
+{
+ if (phys_addr == adap->phys_addr)
+ return;
+ if (phys_addr != CEC_PHYS_ADDR_INVALID && adap->devnode.unregistered)
+ return;
+
+ dprintk(1, "new physical address %x.%x.%x.%x\n",
+ cec_phys_addr_exp(phys_addr));
+ if (phys_addr == CEC_PHYS_ADDR_INVALID ||
+ adap->phys_addr != CEC_PHYS_ADDR_INVALID) {
+ adap->phys_addr = CEC_PHYS_ADDR_INVALID;
+ cec_post_state_event(adap);
+ cec_adap_unconfigure(adap);
+ /* Disabling monitor all mode should always succeed */
+ if (adap->monitor_all_cnt)
+ WARN_ON(call_op(adap, adap_monitor_all_enable, false));
+ mutex_lock(&adap->devnode.lock);
+ if (adap->needs_hpd || list_empty(&adap->devnode.fhs))
+ WARN_ON(adap->ops->adap_enable(adap, false));
+ mutex_unlock(&adap->devnode.lock);
+ if (phys_addr == CEC_PHYS_ADDR_INVALID)
+ return;
+ }
+
+ mutex_lock(&adap->devnode.lock);
+ adap->last_initiator = 0xff;
+
+ if ((adap->needs_hpd || list_empty(&adap->devnode.fhs)) &&
+ adap->ops->adap_enable(adap, true)) {
+ mutex_unlock(&adap->devnode.lock);
+ return;
+ }
+
+ if (adap->monitor_all_cnt &&
+ call_op(adap, adap_monitor_all_enable, true)) {
+ if (adap->needs_hpd || list_empty(&adap->devnode.fhs))
+ WARN_ON(adap->ops->adap_enable(adap, false));
+ mutex_unlock(&adap->devnode.lock);
+ return;
+ }
+ mutex_unlock(&adap->devnode.lock);
+
+ adap->phys_addr = phys_addr;
+ cec_post_state_event(adap);
+ if (adap->log_addrs.num_log_addrs)
+ cec_claim_log_addrs(adap, block);
+}
+
+void cec_s_phys_addr(struct cec_adapter *adap, u16 phys_addr, bool block)
+{
+ if (IS_ERR_OR_NULL(adap))
+ return;
+
+ 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);
+
+/*
+ * Called from either the ioctl or a driver to set the logical addresses.
+ *
+ * This function is called with adap->lock held.
+ */
+int __cec_s_log_addrs(struct cec_adapter *adap,
+ struct cec_log_addrs *log_addrs, bool block)
+{
+ u16 type_mask = 0;
+ int i;
+
+ if (adap->devnode.unregistered)
+ return -ENODEV;
+
+ if (!log_addrs || log_addrs->num_log_addrs == 0) {
+ 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;
+ 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 j;
+
+ log_addrs->log_addr[i] = CEC_LOG_ADDR_INVALID;
+ if (type_mask & (1 << log_addrs->log_addr_type[i])) {
+ dprintk(1, "duplicate logical address type\n");
+ return -EINVAL;
+ }
+ type_mask |= 1 << log_addrs->log_addr_type[i];
+ if ((type_mask & (1 << CEC_LOG_ADDR_TYPE_RECORD)) &&
+ (type_mask & (1 << CEC_LOG_ADDR_TYPE_PLAYBACK))) {
+ /* Record already contains the playback functionality */
+ dprintk(1, "invalid record + playback combination\n");
+ return -EINVAL;
+ }
+ if (log_addrs->primary_device_type[i] >
+ CEC_OP_PRIM_DEVTYPE_PROCESSOR) {
+ dprintk(1, "unknown primary device type\n");
+ return -EINVAL;
+ }
+ if (log_addrs->primary_device_type[i] == 2) {
+ dprintk(1, "invalid primary device type\n");
+ return -EINVAL;
+ }
+ if (log_addrs->log_addr_type[i] > CEC_LOG_ADDR_TYPE_UNREGISTERED) {
+ dprintk(1, "unknown logical address type\n");
+ return -EINVAL;
+ }
+ 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;
+ if (adap->phys_addr != CEC_PHYS_ADDR_INVALID)
+ cec_claim_log_addrs(adap, block);
+ return 0;
+}
+
+int cec_s_log_addrs(struct cec_adapter *adap,
+ struct cec_log_addrs *log_addrs, bool block)
+{
+ int err;
+
+ 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;
+
+ if (adap->ops->received) {
+ /* Allow drivers to process the message first */
+ if (adap->ops->received(adap, msg) != -ENOMSG)
+ return 0;
+ }
+
+ /*
+ * REPORT_PHYSICAL_ADDR, CEC_MSG_USER_CONTROL_PRESSED and
+ * CEC_MSG_USER_CONTROL_RELEASED messages always have to be
+ * handled by the CEC core, even if the passthrough mode is on.
+ * The others are just ignored if passthrough mode is on.
+ */
+ switch (msg->msg[1]) {
+ case CEC_MSG_GET_CEC_VERSION:
+ case CEC_MSG_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;
+ /* Fall through */
+ 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];
+
+ if (!from_unregistered)
+ adap->phys_addrs[init_laddr] = pa;
+ 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 0x60:
+ 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 0x56: case 0x57:
+ case 0x67: case 0x68: case 0x69: case 0x6a:
+ 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 = 0;
+
+ if (adap->monitor_all_cnt == 0)
+ ret = call_op(adap, adap_monitor_all_enable, 1);
+ if (ret == 0)
+ adap->monitor_all_cnt++;
+ return ret;
+}
+
+void cec_monitor_all_cnt_dec(struct cec_adapter *adap)
+{
+ adap->monitor_all_cnt--;
+ if (adap->monitor_all_cnt == 0)
+ WARN_ON(call_op(adap, adap_monitor_all_enable, 0));
+}
+
+/*
+ * 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 = 0;
+
+ if (adap->monitor_pin_cnt == 0)
+ ret = call_op(adap, adap_monitor_pin_enable, 1);
+ if (ret == 0)
+ adap->monitor_pin_cnt++;
+ return ret;
+}
+
+void cec_monitor_pin_cnt_dec(struct cec_adapter *adap)
+{
+ adap->monitor_pin_cnt--;
+ if (adap->monitor_pin_cnt == 0)
+ WARN_ON(call_op(adap, adap_monitor_pin_enable, 0));
+}
+
+#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, "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->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/cec-api.c b/drivers/media/cec/cec-api.c
new file mode 100644
index 0000000..4961573
--- /dev/null
+++ b/drivers/media/cec/cec-api.c
@@ -0,0 +1,688 @@
+// 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;
+
+ if (!cec_is_registered(adap))
+ return EPOLLERR | EPOLLHUP;
+ 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;
+ poll_wait(filp, &fh->wait, poll);
+ 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 = {};
+
+ strlcpy(caps.driver, adap->devnode.dev.parent->driver->name,
+ sizeof(caps.driver));
+ strlcpy(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);
+ log_addrs = adap->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_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;
+
+ /* 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))
+ return -EINVAL;
+
+ mutex_lock(&adap->lock);
+ if (adap->log_addrs.num_log_addrs == 0)
+ err = -EPERM;
+ else if (adap->is_configuring)
+ err = -ENONET;
+ else if (!adap->is_configured &&
+ (adap->needs_hpd || msg.msg[0] != 0xf0))
+ 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_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;
+ }
+
+ mutex_lock(&devnode->lock);
+ if (list_empty(&devnode->fhs) &&
+ !adap->needs_hpd &&
+ adap->phys_addr == CEC_PHYS_ADDR_INVALID) {
+ err = adap->ops->adap_enable(adap, true);
+ if (err) {
+ mutex_unlock(&devnode->lock);
+ 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;
+ cec_queue_event_fh(fh, &ev, 0);
+#ifdef CONFIG_CEC_PIN
+ if (adap->pin && adap->pin->ops->read_hpd) {
+ 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) {
+ 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
+
+ list_add(&fh->list, &devnode->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);
+ list_del(&fh->list);
+ if (cec_is_registered(adap) && list_empty(&devnode->fhs) &&
+ !adap->needs_hpd && adap->phys_addr == CEC_PHYS_ADDR_INVALID) {
+ WARN_ON(adap->ops->adap_enable(adap, false));
+ }
+ 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(&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,
+ .release = cec_release,
+ .poll = cec_poll,
+ .llseek = no_llseek,
+};
diff --git a/drivers/media/cec/cec-core.c b/drivers/media/cec/cec-core.c
new file mode 100644
index 0000000..b278ab9
--- /dev/null
+++ b/drivers/media/cec/cec-core.c
@@ -0,0 +1,478 @@
+// 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"
+
+int cec_debug;
+module_param_named(debug, cec_debug, int, 0644);
+MODULE_PARM_DESC(debug, "debug level (0-2)");
+
+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_next_zero_bit(cec_devnode_nums, CEC_NUM_DEVICES, 0);
+ 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;
+
+ ret = cdev_device_add(&devnode->cdev, &devnode->dev);
+ if (ret) {
+ pr_err("%s: cdev_device_add failed\n", __func__);
+ goto clr_bit;
+ }
+
+ devnode->registered = true;
+ 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;
+ }
+
+ list_for_each_entry(fh, &devnode->fhs, list)
+ wake_up_interruptible(&fh->wait);
+
+ devnode->registered = false;
+ devnode->unregistered = true;
+ 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);
+ mutex_unlock(&adap->lock);
+
+ cdev_device_del(&devnode->cdev, &devnode->dev);
+ put_device(&devnode->dev);
+}
+
+#ifdef CONFIG_CEC_NOTIFIER
+static void cec_cec_notify(struct cec_adapter *adap, u16 pa)
+{
+ cec_s_phys_addr(adap, pa, false);
+}
+
+void cec_register_cec_notifier(struct cec_adapter *adap,
+ struct cec_notifier *notifier)
+{
+ if (WARN_ON(!cec_is_registered(adap)))
+ return;
+
+ adap->notifier = notifier;
+ cec_notifier_register(adap->notifier, adap, cec_cec_notify);
+}
+EXPORT_SYMBOL_GPL(cec_register_cec_notifier);
+#endif
+
+#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 (!adap->ops->error_inj_parse_line(adap, 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 adap->ops->error_inj_show(adap, 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);
+ strlcpy(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;
+ adap->needs_hpd = caps & CEC_CAP_NEEDS_HPD;
+ adap->available_log_addrs = available_las;
+ adap->sequence = 0;
+ adap->ops = ops;
+ adap->priv = priv;
+ memset(adap->phys_addrs, 0xff, sizeof(adap->phys_addrs));
+ 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);
+
+ 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->device_name, sizeof(adap->device_name),
+ "RC for %s", name);
+ snprintf(adap->input_phys, sizeof(adap->input_phys),
+ "%s/input0", name);
+
+ adap->rc->device_name = adap->device_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_NS(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;
+
+#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);
+ if (IS_ERR_OR_NULL(adap->cec_dir)) {
+ pr_warn("cec-%s: Failed to create debugfs dir\n", adap->name);
+ return 0;
+ }
+ adap->status_file = debugfs_create_devm_seqfile(&adap->devnode.dev,
+ "status", adap->cec_dir, cec_adap_status);
+ if (IS_ERR_OR_NULL(adap->status_file)) {
+ pr_warn("cec-%s: Failed to create status file\n", adap->name);
+ debugfs_remove_recursive(adap->cec_dir);
+ adap->cec_dir = NULL;
+ return 0;
+ }
+ if (!adap->ops->error_inj_show || !adap->ops->error_inj_parse_line)
+ return 0;
+ adap->error_inj_file = debugfs_create_file("error-inj", 0644,
+ adap->cec_dir, adap,
+ &cec_error_inj_fops);
+ if (IS_ERR_OR_NULL(adap->error_inj_file))
+ pr_warn("cec-%s: Failed to create error-inj file\n",
+ adap->name);
+#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
+ if (adap->notifier)
+ cec_notifier_unregister(adap->notifier);
+#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;
+ kthread_stop(adap->kthread);
+ if (adap->kthread_config)
+ kthread_stop(adap->kthread_config);
+ 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/cec-edid.c b/drivers/media/cec/cec-edid.c
new file mode 100644
index 0000000..f587e8e
--- /dev/null
+++ b/drivers/media/cec/cec-edid.c
@@ -0,0 +1,95 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * cec-edid - HDMI Consumer Electronics Control EDID & CEC helper functions
+ *
+ * Copyright 2016 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <media/cec.h>
+
+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_set_edid_phys_addr(u8 *edid, unsigned int size, u16 phys_addr)
+{
+ unsigned int loc = cec_get_edid_spa_location(edid, size);
+ u8 sum = 0;
+ unsigned int i;
+
+ if (loc == 0)
+ return;
+ edid[loc] = phys_addr >> 8;
+ edid[loc + 1] = phys_addr & 0xff;
+ loc &= ~0x7f;
+
+ /* update the checksum */
+ for (i = loc; i < loc + 127; i++)
+ sum += edid[i];
+ edid[i] = 256 - sum;
+}
+EXPORT_SYMBOL_GPL(cec_set_edid_phys_addr);
+
+u16 cec_phys_addr_for_input(u16 phys_addr, u8 input)
+{
+ /* Check if input is sane */
+ if (WARN_ON(input == 0 || input > 0xf))
+ return CEC_PHYS_ADDR_INVALID;
+
+ if (phys_addr == 0)
+ return input << 12;
+
+ if ((phys_addr & 0x0fff) == 0)
+ return phys_addr | (input << 8);
+
+ if ((phys_addr & 0x00ff) == 0)
+ return phys_addr | (input << 4);
+
+ if ((phys_addr & 0x000f) == 0)
+ return phys_addr | input;
+
+ /*
+ * All nibbles are used so no valid physical addresses can be assigned
+ * to the input.
+ */
+ return CEC_PHYS_ADDR_INVALID;
+}
+EXPORT_SYMBOL_GPL(cec_phys_addr_for_input);
+
+int cec_phys_addr_validate(u16 phys_addr, u16 *parent, u16 *port)
+{
+ int i;
+
+ if (parent)
+ *parent = phys_addr;
+ if (port)
+ *port = 0;
+ 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;
+ if (parent)
+ *parent = phys_addr & (0xfff0 << i);
+ if (port)
+ *port = (phys_addr >> i) & 0xf;
+ for (i += 4; i < 16; i += 4)
+ if ((phys_addr & (0xf << i)) == 0)
+ return -EINVAL;
+ return 0;
+}
+EXPORT_SYMBOL_GPL(cec_phys_addr_validate);
diff --git a/drivers/media/cec/cec-notifier.c b/drivers/media/cec/cec-notifier.c
new file mode 100644
index 0000000..dd2078b
--- /dev/null
+++ b/drivers/media/cec/cec-notifier.c
@@ -0,0 +1,129 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * cec-notifier.c - notify CEC drivers of physical address changes
+ *
+ * Copyright 2016 Russell King <rmk+kernel@arm.linux.org.uk>
+ * 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/list.h>
+#include <linux/kref.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 *dev;
+ const char *conn;
+ struct cec_adapter *cec_adap;
+ void (*callback)(struct cec_adapter *adap, u16 pa);
+
+ u16 phys_addr;
+};
+
+static LIST_HEAD(cec_notifiers);
+static DEFINE_MUTEX(cec_notifiers_lock);
+
+struct cec_notifier *cec_notifier_get_conn(struct device *dev, const char *conn)
+{
+ struct cec_notifier *n;
+
+ mutex_lock(&cec_notifiers_lock);
+ list_for_each_entry(n, &cec_notifiers, head) {
+ if (n->dev == dev &&
+ (!conn || !strcmp(n->conn, conn))) {
+ kref_get(&n->kref);
+ mutex_unlock(&cec_notifiers_lock);
+ return n;
+ }
+ }
+ n = kzalloc(sizeof(*n), GFP_KERNEL);
+ if (!n)
+ goto unlock;
+ n->dev = dev;
+ if (conn)
+ n->conn = kstrdup(conn, GFP_KERNEL);
+ 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;
+}
+EXPORT_SYMBOL_GPL(cec_notifier_get_conn);
+
+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->conn);
+ kfree(n);
+}
+
+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);
+}
+EXPORT_SYMBOL_GPL(cec_notifier_put);
+
+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->callback)
+ n->callback(n->cec_adap, n->phys_addr);
+ 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);
+
+void cec_notifier_register(struct cec_notifier *n,
+ struct cec_adapter *adap,
+ void (*callback)(struct cec_adapter *adap, u16 pa))
+{
+ kref_get(&n->kref);
+ mutex_lock(&n->lock);
+ n->cec_adap = adap;
+ n->callback = callback;
+ n->callback(adap, n->phys_addr);
+ mutex_unlock(&n->lock);
+}
+EXPORT_SYMBOL_GPL(cec_notifier_register);
+
+void cec_notifier_unregister(struct cec_notifier *n)
+{
+ mutex_lock(&n->lock);
+ n->callback = NULL;
+ mutex_unlock(&n->lock);
+ cec_notifier_put(n);
+}
+EXPORT_SYMBOL_GPL(cec_notifier_unregister);
diff --git a/drivers/media/cec/cec-pin-error-inj.c b/drivers/media/cec/cec-pin-error-inj.c
new file mode 100644
index 0000000..c0088d3
--- /dev/null
+++ b/drivers/media/cec/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, "# <op>[,<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/cec-pin-priv.h b/drivers/media/cec/cec-pin-priv.h
new file mode 100644
index 0000000..f423db8
--- /dev/null
+++ b/drivers/media/cec/cec-pin-priv.h
@@ -0,0 +1,241 @@
+/* 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>
+
+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 enabled;
+ 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_100ms_overruns;
+ u32 timer_300ms_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/cec-pin.c b/drivers/media/cec/cec-pin.c
new file mode 100644
index 0000000..6e31142
--- /dev/null
+++ b/drivers/media/cec/cec-pin.c
@@ -0,0 +1,1314 @@
+// 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 = pin->ops->read(pin->adap);
+
+ cec_pin_update(pin, v, false);
+ return v;
+}
+
+static void cec_pin_low(struct cec_pin *pin)
+{
+ pin->ops->low(pin->adap);
+ cec_pin_update(pin, false, false);
+}
+
+static bool cec_pin_high(struct cec_pin *pin)
+{
+ pin->ops->high(pin->adap);
+ 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;
+ }
+ /* fall through */
+ 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;
+ }
+ /* fall through */
+ 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++;
+ /* fall through */
+ 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 && !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_100ms_overruns++;
+ if (delta > 300)
+ pin->timer_300ms_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;
+ 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;
+
+ 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 (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:
+ pin->ops->disable_irq(adap);
+ cec_pin_high(pin);
+ cec_pin_to_idle(pin);
+ hrtimer_start(&pin->timer, ns_to_ktime(0),
+ HRTIMER_MODE_REL);
+ break;
+ case CEC_PIN_IRQ_ENABLE:
+ pin->enable_irq_failed = !pin->ops->enable_irq(adap);
+ if (pin->enable_irq_failed) {
+ cec_pin_to_idle(pin);
+ hrtimer_start(&pin->timer, ns_to_ktime(0),
+ HRTIMER_MODE_REL);
+ }
+ break;
+ default:
+ break;
+ }
+
+ if (kthread_should_stop())
+ break;
+ }
+ return 0;
+}
+
+static int cec_pin_adap_enable(struct cec_adapter *adap, bool enable)
+{
+ struct cec_pin *pin = adap->pin;
+
+ pin->enabled = enable;
+ if (enable) {
+ atomic_set(&pin->work_pin_num_events, 0);
+ pin->work_pin_events_rd = pin->work_pin_events_wr = 0;
+ pin->work_pin_events_dropped = false;
+ 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);
+ pin->kthread = kthread_run(cec_pin_thread_func, adap,
+ "cec-pin");
+ if (IS_ERR(pin->kthread)) {
+ pr_err("cec-pin: kernel_thread() failed\n");
+ return PTR_ERR(pin->kthread);
+ }
+ hrtimer_start(&pin->timer, ns_to_ktime(0),
+ HRTIMER_MODE_REL);
+ } else {
+ if (pin->ops->disable_irq)
+ pin->ops->disable_irq(adap);
+ hrtimer_cancel(&pin->timer);
+ kthread_stop(pin->kthread);
+ cec_pin_read(pin);
+ cec_pin_to_idle(pin);
+ pin->state = CEC_ST_OFF;
+ }
+ 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_UNCHANGED);
+ pin->ops->disable_irq(pin->adap);
+ cec_pin_high(pin);
+ cec_pin_to_idle(pin);
+ hrtimer_start(&pin->timer, ns_to_ktime(0), HRTIMER_MODE_REL);
+}
+
+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;
+
+ 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", pin->ops->read(adap));
+ 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_100ms_overruns) {
+ seq_printf(file, "timer overruns > 100ms: %u of %u\n",
+ pin->timer_100ms_overruns, pin->timer_cnt);
+ seq_printf(file, "timer overruns > 300ms: %u of %u\n",
+ pin->timer_300ms_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_100ms_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_100ms_overruns = 0;
+ pin->timer_300ms_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;
+ if (pin->ops->status)
+ pin->ops->status(adap, 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->ops->free)
+ pin->ops->free(adap);
+ adap->pin = NULL;
+ kfree(pin);
+}
+
+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
+};
+
+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);
+ 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/cec-priv.h b/drivers/media/cec/cec-priv.h
new file mode 100644
index 0000000..804e38f
--- /dev/null
+++ b/drivers/media/cec/cec-priv.h
@@ -0,0 +1,46 @@
+/* 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.h>
+
+#define dprintk(lvl, fmt, arg...) \
+ do { \
+ if (lvl <= cec_debug) \
+ pr_info("cec-%s: " fmt, adap->name, ## arg); \
+ } while (0)
+
+/* devnode to cec_adapter */
+#define to_cec_adapter(node) container_of(node, struct cec_adapter, devnode)
+
+/* 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);
+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