Resguardo inicial

linux-7.2.3/drivers/media/cec/usb/extron-da-hd-4k-plus/Kconfig

@@ -0,0 +1,14 @@
+# SPDX-License-Identifier: GPL-2.0-only
+config USB_EXTRON_DA_HD_4K_PLUS_CEC
+	tristate "Extron DA HD 4K Plus CEC driver"
+	depends on VIDEO_DEV
+	depends on USB
+	depends on USB_ACM
+	select CEC_CORE
+	select SERIO
+	select SERIO_SERPORT
+	help
+	  This is a CEC driver for the Extron DA HD 4K Plus HDMI Splitter.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called extron-da-hd-4k-plus-cec.

linux-7.2.3/drivers/media/cec/usb/extron-da-hd-4k-plus/Makefile

@@ -0,0 +1,2 @@
+extron-da-hd-4k-plus-cec-objs := extron-da-hd-4k-plus.o cec-splitter.o
+obj-$(CONFIG_USB_EXTRON_DA_HD_4K_PLUS_CEC) := extron-da-hd-4k-plus-cec.o

linux-7.2.3/drivers/media/cec/usb/extron-da-hd-4k-plus/cec-splitter.c

@@ -0,0 +1,657 @@
+// SPDX-License-Identifier: GPL-2.0-only
+
+/*
+ * Copyright 2021-2024 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
+ */
+
+#include <media/cec.h>
+
+#include "cec-splitter.h"
+
+/*
+ * Helper function to reply to a received message with a 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);
+}
+
+/* Transmit an Active Source message from this output port to a sink */
+static void cec_port_out_active_source(struct cec_splitter_port *p)
+{
+	struct cec_adapter *adap = p->adap;
+	struct cec_msg msg;
+
+	if (!adap->is_configured)
+		return;
+	p->is_active_source = true;
+	cec_msg_init(&msg, adap->log_addrs.log_addr[0], 0);
+	cec_msg_active_source(&msg, adap->phys_addr);
+	cec_transmit_msg(adap, &msg, false);
+}
+
+/* Transmit Active Source messages from all output ports to the sinks */
+static void cec_out_active_source(struct cec_splitter *splitter)
+{
+	unsigned int i;
+
+	for (i = 0; i < splitter->num_out_ports; i++)
+		cec_port_out_active_source(splitter->ports[i]);
+}
+
+/* Transmit a Standby message from this output port to a sink */
+static void cec_port_out_standby(struct cec_splitter_port *p)
+{
+	struct cec_adapter *adap = p->adap;
+	struct cec_msg msg;
+
+	if (!adap->is_configured)
+		return;
+	cec_msg_init(&msg, adap->log_addrs.log_addr[0], 0);
+	cec_msg_standby(&msg);
+	cec_transmit_msg(adap, &msg, false);
+}
+
+/* Transmit Standby messages from all output ports to the sinks */
+static void cec_out_standby(struct cec_splitter *splitter)
+{
+	unsigned int i;
+
+	for (i = 0; i < splitter->num_out_ports; i++)
+		cec_port_out_standby(splitter->ports[i]);
+}
+
+/* Transmit an Image/Text View On message from this output port to a sink */
+static void cec_port_out_wakeup(struct cec_splitter_port *p, u8 opcode)
+{
+	struct cec_adapter *adap = p->adap;
+	u8 la = adap->log_addrs.log_addr[0];
+	struct cec_msg msg;
+
+	if (la == CEC_LOG_ADDR_INVALID)
+		la = CEC_LOG_ADDR_UNREGISTERED;
+	cec_msg_init(&msg, la, 0);
+	msg.len = 2;
+	msg.msg[1] = opcode;
+	cec_transmit_msg(adap, &msg, false);
+}
+
+/* Transmit Image/Text View On messages from all output ports to the sinks */
+static void cec_out_wakeup(struct cec_splitter *splitter, u8 opcode)
+{
+	unsigned int i;
+
+	for (i = 0; i < splitter->num_out_ports; i++)
+		cec_port_out_wakeup(splitter->ports[i], opcode);
+}
+
+/*
+ * Update the power state of the unconfigured CEC device to either
+ * Off or On depending on the current state of the splitter.
+ * This keeps the outputs in a consistent state.
+ */
+void cec_splitter_unconfigured_output(struct cec_splitter_port *p)
+{
+	p->video_latency = 1;
+	p->power_status = p->splitter->is_standby ?
+		CEC_OP_POWER_STATUS_TO_STANDBY : CEC_OP_POWER_STATUS_TO_ON;
+
+	/* The adapter was unconfigured, so clear the sequence and ts values */
+	p->out_give_device_power_status_seq = 0;
+	p->out_give_device_power_status_ts = ktime_set(0, 0);
+	p->out_request_current_latency_seq = 0;
+	p->out_request_current_latency_ts = ktime_set(0, 0);
+}
+
+/*
+ * Update the power state of the newly configured CEC device to either
+ * Off or On depending on the current state of the splitter.
+ * This keeps the outputs in a consistent state.
+ */
+void cec_splitter_configured_output(struct cec_splitter_port *p)
+{
+	p->video_latency = 1;
+	p->power_status = p->splitter->is_standby ?
+		CEC_OP_POWER_STATUS_TO_STANDBY : CEC_OP_POWER_STATUS_TO_ON;
+
+	if (p->splitter->is_standby) {
+		/*
+		 * Some sinks only obey Standby if it comes from the
+		 * active source.
+		 */
+		cec_port_out_active_source(p);
+		cec_port_out_standby(p);
+	} else {
+		cec_port_out_wakeup(p, CEC_MSG_IMAGE_VIEW_ON);
+	}
+}
+
+/* Pass the in_msg on to all output ports */
+static void cec_out_passthrough(struct cec_splitter *splitter,
+				const struct cec_msg *in_msg)
+{
+	unsigned int i;
+
+	for (i = 0; i < splitter->num_out_ports; i++) {
+		struct cec_splitter_port *p = splitter->ports[i];
+		struct cec_adapter *adap = p->adap;
+		struct cec_msg msg;
+
+		if (!adap->is_configured)
+			continue;
+		cec_msg_init(&msg, adap->log_addrs.log_addr[0], 0);
+		msg.len = in_msg->len;
+		memcpy(msg.msg + 1, in_msg->msg + 1, msg.len - 1);
+		cec_transmit_msg(adap, &msg, false);
+	}
+}
+
+/*
+ * See if all output ports received the Report Current Latency message,
+ * and if so, transmit the result from the input port to the video source.
+ */
+static void cec_out_report_current_latency(struct cec_splitter *splitter,
+					   struct cec_adapter *input_adap)
+{
+	struct cec_msg reply = {};
+	unsigned int reply_lat = 0;
+	unsigned int cnt = 0;
+	unsigned int i;
+
+	for (i = 0; i < splitter->num_out_ports; i++) {
+		struct cec_splitter_port *p = splitter->ports[i];
+		struct cec_adapter *adap = p->adap;
+
+		/* Skip unconfigured ports */
+		if (!adap->is_configured)
+			continue;
+		/* Return if a port is still waiting for a reply */
+		if (p->out_request_current_latency_seq)
+			return;
+		reply_lat += p->video_latency - 1;
+		cnt++;
+	}
+
+	/*
+	 * All ports that can reply, replied, so clear the sequence
+	 * and timestamp values.
+	 */
+	for (i = 0; i < splitter->num_out_ports; i++) {
+		struct cec_splitter_port *p = splitter->ports[i];
+
+		p->out_request_current_latency_seq = 0;
+		p->out_request_current_latency_ts = ktime_set(0, 0);
+	}
+
+	/*
+	 * Return if there were no replies or the input port is no longer
+	 * configured.
+	 */
+	if (!cnt || !input_adap->is_configured)
+		return;
+
+	/* Reply with the average latency */
+	reply_lat = 1 + reply_lat / cnt;
+	cec_msg_init(&reply, input_adap->log_addrs.log_addr[0],
+		     splitter->request_current_latency_dest);
+	cec_msg_report_current_latency(&reply, input_adap->phys_addr,
+				       reply_lat, 1, 1, 1);
+	cec_transmit_msg(input_adap, &reply, false);
+}
+
+/* Transmit Request Current Latency to all output ports */
+static int cec_out_request_current_latency(struct cec_splitter *splitter)
+{
+	ktime_t now = ktime_get();
+	bool error = true;
+	unsigned int i;
+
+	for (i = 0; i < splitter->num_out_ports; i++) {
+		struct cec_splitter_port *p = splitter->ports[i];
+		struct cec_adapter *adap = p->adap;
+
+		if (!adap->is_configured) {
+			/* Clear if not configured */
+			p->out_request_current_latency_seq = 0;
+			p->out_request_current_latency_ts = ktime_set(0, 0);
+		} else if (!p->out_request_current_latency_seq) {
+			/*
+			 * Keep the old ts if an earlier request is still
+			 * pending. This ensures that the request will
+			 * eventually time out based on the timestamp of
+			 * the first request if the sink is unresponsive.
+			 */
+			p->out_request_current_latency_ts = now;
+		}
+	}
+
+	for (i = 0; i < splitter->num_out_ports; i++) {
+		struct cec_splitter_port *p = splitter->ports[i];
+		struct cec_adapter *adap = p->adap;
+		struct cec_msg msg;
+
+		if (!adap->is_configured)
+			continue;
+		cec_msg_init(&msg, adap->log_addrs.log_addr[0], 0);
+		cec_msg_request_current_latency(&msg, true, adap->phys_addr);
+		if (cec_transmit_msg(adap, &msg, false))
+			continue;
+		p->out_request_current_latency_seq = msg.sequence | (1U << 31);
+		error = false;
+	}
+	return error ? -ENODEV : 0;
+}
+
+/*
+ * See if all output ports received the Report Power Status message,
+ * and if so, transmit the result from the input port to the video source.
+ */
+static void cec_out_report_power_status(struct cec_splitter *splitter,
+					struct cec_adapter *input_adap)
+{
+	struct cec_msg reply = {};
+	/* The target power status of the splitter itself */
+	u8 splitter_pwr = splitter->is_standby ?
+		CEC_OP_POWER_STATUS_STANDBY : CEC_OP_POWER_STATUS_ON;
+	/*
+	 * The transient power status of the splitter, used if not all
+	 * output report the target power status.
+	 */
+	u8 splitter_transient_pwr = splitter->is_standby ?
+		CEC_OP_POWER_STATUS_TO_STANDBY : CEC_OP_POWER_STATUS_TO_ON;
+	u8 reply_pwr = splitter_pwr;
+	unsigned int i;
+
+	for (i = 0; i < splitter->num_out_ports; i++) {
+		struct cec_splitter_port *p = splitter->ports[i];
+
+		/* Skip if no sink was found (HPD was low for more than 5s) */
+		if (!p->found_sink)
+			continue;
+
+		/* Return if a port is still waiting for a reply */
+		if (p->out_give_device_power_status_seq)
+			return;
+		if (p->power_status != splitter_pwr)
+			reply_pwr = splitter_transient_pwr;
+	}
+
+	/*
+	 * All ports that can reply, replied, so clear the sequence
+	 * and timestamp values.
+	 */
+	for (i = 0; i < splitter->num_out_ports; i++) {
+		struct cec_splitter_port *p = splitter->ports[i];
+
+		p->out_give_device_power_status_seq = 0;
+		p->out_give_device_power_status_ts = ktime_set(0, 0);
+	}
+
+	/* Return if the input port is no longer configured. */
+	if (!input_adap->is_configured)
+		return;
+
+	/* Reply with the new power status */
+	cec_msg_init(&reply, input_adap->log_addrs.log_addr[0],
+		     splitter->give_device_power_status_dest);
+	cec_msg_report_power_status(&reply, reply_pwr);
+	cec_transmit_msg(input_adap, &reply, false);
+}
+
+/* Transmit Give Device Power Status to all output ports */
+static int cec_out_give_device_power_status(struct cec_splitter *splitter)
+{
+	ktime_t now = ktime_get();
+	bool error = true;
+	unsigned int i;
+
+	for (i = 0; i < splitter->num_out_ports; i++) {
+		struct cec_splitter_port *p = splitter->ports[i];
+		struct cec_adapter *adap = p->adap;
+
+		/*
+		 * Keep the old ts if an earlier request is still
+		 * pending. This ensures that the request will
+		 * eventually time out based on the timestamp of
+		 * the first request if the sink is unresponsive.
+		 */
+		if (adap->is_configured && !p->out_give_device_power_status_seq)
+			p->out_give_device_power_status_ts = now;
+	}
+
+	for (i = 0; i < splitter->num_out_ports; i++) {
+		struct cec_splitter_port *p = splitter->ports[i];
+		struct cec_adapter *adap = p->adap;
+		struct cec_msg msg;
+
+		if (!adap->is_configured)
+			continue;
+
+		cec_msg_init(&msg, adap->log_addrs.log_addr[0], 0);
+		cec_msg_give_device_power_status(&msg, true);
+		if (cec_transmit_msg(adap, &msg, false))
+			continue;
+		p->out_give_device_power_status_seq = msg.sequence | (1U << 31);
+		error = false;
+	}
+	return error ? -ENODEV : 0;
+}
+
+/*
+ * CEC messages received on the HDMI input of the splitter are
+ * forwarded (if relevant) to the HDMI outputs of the splitter.
+ */
+int cec_splitter_received_input(struct cec_splitter_port *p, struct cec_msg *msg)
+{
+	if (!cec_msg_status_is_ok(msg))
+		return 0;
+
+	if (msg->len < 2)
+		return -ENOMSG;
+
+	switch (msg->msg[1]) {
+	case CEC_MSG_DEVICE_VENDOR_ID:
+	case CEC_MSG_REPORT_POWER_STATUS:
+	case CEC_MSG_SET_STREAM_PATH:
+	case CEC_MSG_ROUTING_CHANGE:
+	case CEC_MSG_REQUEST_ACTIVE_SOURCE:
+	case CEC_MSG_SYSTEM_AUDIO_MODE_STATUS:
+		return 0;
+
+	case CEC_MSG_STANDBY:
+		p->splitter->is_standby = true;
+		cec_out_standby(p->splitter);
+		return 0;
+
+	case CEC_MSG_IMAGE_VIEW_ON:
+	case CEC_MSG_TEXT_VIEW_ON:
+		p->splitter->is_standby = false;
+		cec_out_wakeup(p->splitter, msg->msg[1]);
+		return 0;
+
+	case CEC_MSG_ACTIVE_SOURCE:
+		cec_out_active_source(p->splitter);
+		return 0;
+
+	case CEC_MSG_SET_SYSTEM_AUDIO_MODE:
+		cec_out_passthrough(p->splitter, msg);
+		return 0;
+
+	case CEC_MSG_GIVE_DEVICE_POWER_STATUS:
+		p->splitter->give_device_power_status_dest =
+			cec_msg_initiator(msg);
+		if (cec_out_give_device_power_status(p->splitter))
+			cec_feature_abort_reason(p->adap, msg,
+						 CEC_OP_ABORT_INCORRECT_MODE);
+		return 0;
+
+	case CEC_MSG_REQUEST_CURRENT_LATENCY: {
+		u16 pa;
+
+		p->splitter->request_current_latency_dest =
+			cec_msg_initiator(msg);
+		cec_ops_request_current_latency(msg, &pa);
+		if (pa == p->adap->phys_addr &&
+		    cec_out_request_current_latency(p->splitter))
+			cec_feature_abort_reason(p->adap, msg,
+						 CEC_OP_ABORT_INCORRECT_MODE);
+		return 0;
+	}
+
+	default:
+		return -ENOMSG;
+	}
+	return -ENOMSG;
+}
+
+void cec_splitter_nb_transmit_canceled_output(struct cec_splitter_port *p,
+					      const struct cec_msg *msg,
+					      struct cec_adapter *input_adap)
+{
+	struct cec_splitter *splitter = p->splitter;
+	u32 seq = msg->sequence | (1U << 31);
+
+	/*
+	 * If this is the result of a failed non-blocking transmit, or it is
+	 * the result of the failed reply to a non-blocking transmit, then
+	 * check if the original transmit was to get the current power status
+	 * or latency and, if so, assume that the remove device is for one
+	 * reason or another unavailable and assume that it is in the same
+	 * power status as the splitter, or has no video latency.
+	 */
+	if ((cec_msg_recv_is_tx_result(msg) && !(msg->tx_status & CEC_TX_STATUS_OK)) ||
+	    (cec_msg_recv_is_rx_result(msg) && !(msg->rx_status & CEC_RX_STATUS_OK))) {
+		u8 tx_op = msg->msg[1];
+
+		if (msg->len < 2)
+			return;
+		if (cec_msg_recv_is_rx_result(msg) &&
+		    (msg->rx_status & CEC_RX_STATUS_FEATURE_ABORT))
+			tx_op = msg->msg[2];
+		switch (tx_op) {
+		case CEC_MSG_GIVE_DEVICE_POWER_STATUS:
+			if (p->out_give_device_power_status_seq != seq)
+				break;
+			p->out_give_device_power_status_seq = 0;
+			p->out_give_device_power_status_ts = ktime_set(0, 0);
+			p->power_status = splitter->is_standby ?
+					  CEC_OP_POWER_STATUS_STANDBY :
+					  CEC_OP_POWER_STATUS_ON;
+			cec_out_report_power_status(splitter, input_adap);
+			break;
+		case CEC_MSG_REQUEST_CURRENT_LATENCY:
+			if (p->out_request_current_latency_seq != seq)
+				break;
+			p->video_latency = 1;
+			p->out_request_current_latency_seq = 0;
+			p->out_request_current_latency_ts = ktime_set(0, 0);
+			cec_out_report_current_latency(splitter, input_adap);
+			break;
+		}
+		return;
+	}
+
+	if (cec_msg_recv_is_tx_result(msg)) {
+		if (p->out_request_current_latency_seq != seq)
+			return;
+		p->out_request_current_latency_ts = ns_to_ktime(msg->tx_ts);
+		return;
+	}
+}
+
+/*
+ * CEC messages received on an HDMI output of the splitter
+ * are processed here.
+ */
+int cec_splitter_received_output(struct cec_splitter_port *p, struct cec_msg *msg,
+				 struct cec_adapter *input_adap)
+{
+	struct cec_adapter *adap = p->adap;
+	struct cec_splitter *splitter = p->splitter;
+	u32 seq = msg->sequence | (1U << 31);
+	struct cec_msg reply = {};
+	u16 pa;
+
+	if (!adap->is_configured || msg->len < 2)
+		return -ENOMSG;
+
+	switch (msg->msg[1]) {
+	case CEC_MSG_REPORT_POWER_STATUS: {
+		u8 pwr;
+
+		cec_ops_report_power_status(msg, &pwr);
+		if (pwr > CEC_OP_POWER_STATUS_TO_STANDBY)
+			pwr = splitter->is_standby ?
+				CEC_OP_POWER_STATUS_TO_STANDBY :
+				CEC_OP_POWER_STATUS_TO_ON;
+		p->power_status = pwr;
+		if (p->out_give_device_power_status_seq == seq) {
+			p->out_give_device_power_status_seq = 0;
+			p->out_give_device_power_status_ts = ktime_set(0, 0);
+		}
+		cec_out_report_power_status(splitter, input_adap);
+		return 0;
+	}
+
+	case CEC_MSG_REPORT_CURRENT_LATENCY: {
+		u8 video_lat;
+		u8 low_lat_mode;
+		u8 audio_out_comp;
+		u8 audio_out_delay;
+
+		cec_ops_report_current_latency(msg, &pa,
+					       &video_lat, &low_lat_mode,
+					       &audio_out_comp, &audio_out_delay);
+		if (!video_lat || video_lat >= 252)
+			video_lat = 1;
+		p->video_latency = video_lat;
+		if (p->out_request_current_latency_seq == seq) {
+			p->out_request_current_latency_seq = 0;
+			p->out_request_current_latency_ts = ktime_set(0, 0);
+		}
+		cec_out_report_current_latency(splitter, input_adap);
+		return 0;
+	}
+
+	case CEC_MSG_STANDBY:
+	case CEC_MSG_ROUTING_CHANGE:
+	case CEC_MSG_GIVE_SYSTEM_AUDIO_MODE_STATUS:
+		return 0;
+
+	case CEC_MSG_ACTIVE_SOURCE:
+		cec_ops_active_source(msg, &pa);
+		if (pa == 0)
+			p->is_active_source = false;
+		return 0;
+
+	case CEC_MSG_REQUEST_ACTIVE_SOURCE:
+		if (!p->is_active_source)
+			return 0;
+		cec_msg_set_reply_to(&reply, msg);
+		cec_msg_active_source(&reply, adap->phys_addr);
+		cec_transmit_msg(adap, &reply, false);
+		return 0;
+
+	case CEC_MSG_GIVE_DEVICE_POWER_STATUS:
+		cec_msg_set_reply_to(&reply, msg);
+		cec_msg_report_power_status(&reply, splitter->is_standby ?
+					    CEC_OP_POWER_STATUS_STANDBY :
+					    CEC_OP_POWER_STATUS_ON);
+		cec_transmit_msg(adap, &reply, false);
+		return 0;
+
+	case CEC_MSG_SET_STREAM_PATH:
+		cec_ops_set_stream_path(msg, &pa);
+		if (pa == adap->phys_addr) {
+			cec_msg_set_reply_to(&reply, msg);
+			cec_msg_active_source(&reply, pa);
+			cec_transmit_msg(adap, &reply, false);
+		}
+		return 0;
+
+	default:
+		return -ENOMSG;
+	}
+	return -ENOMSG;
+}
+
+/*
+ * Called every second to check for timed out messages and whether there
+ * still is a video sink connected or not.
+ *
+ * Returns true if sinks were lost.
+ */
+bool cec_splitter_poll(struct cec_splitter *splitter,
+		       struct cec_adapter *input_adap, bool debug)
+{
+	ktime_t now = ktime_get();
+	u8 pwr = splitter->is_standby ?
+		 CEC_OP_POWER_STATUS_STANDBY : CEC_OP_POWER_STATUS_ON;
+	unsigned int max_delay_ms = input_adap->xfer_timeout_ms + 2000;
+	unsigned int i;
+	bool res = false;
+
+	for (i = 0; i < splitter->num_out_ports; i++) {
+		struct cec_splitter_port *p = splitter->ports[i];
+		s64 pwr_delta, lat_delta;
+		bool pwr_timeout, lat_timeout;
+
+		if (!p)
+			continue;
+
+		pwr_delta = ktime_ms_delta(now, p->out_give_device_power_status_ts);
+		pwr_timeout = p->out_give_device_power_status_seq &&
+			      pwr_delta >= max_delay_ms;
+		lat_delta = ktime_ms_delta(now, p->out_request_current_latency_ts);
+		lat_timeout = p->out_request_current_latency_seq &&
+			      lat_delta >= max_delay_ms;
+
+		/*
+		 * If the HPD is low for more than 5 seconds, then assume no display
+		 * is connected.
+		 */
+		if (p->found_sink && ktime_to_ns(p->lost_sink_ts) &&
+		    ktime_ms_delta(now, p->lost_sink_ts) > 5000) {
+			if (debug)
+				dev_info(splitter->dev,
+					 "port %u: HPD low for more than 5s, assume no sink is connected.\n",
+					 p->port);
+			p->found_sink = false;
+			p->lost_sink_ts = ktime_set(0, 0);
+			res = true;
+		}
+
+		/*
+		 * If the power status request timed out, then set the port's
+		 * power status to that of the splitter, ensuring a consistent
+		 * power state.
+		 */
+		if (pwr_timeout) {
+			mutex_lock(&p->adap->lock);
+			if (debug)
+				dev_info(splitter->dev,
+					 "port %u: give up on power status for seq %u\n",
+					 p->port,
+					 p->out_give_device_power_status_seq & ~(1 << 31));
+			p->power_status = pwr;
+			p->out_give_device_power_status_seq = 0;
+			p->out_give_device_power_status_ts = ktime_set(0, 0);
+			mutex_unlock(&p->adap->lock);
+			cec_out_report_power_status(splitter, input_adap);
+		}
+
+		/*
+		 * If the current latency request timed out, then set the port's
+		 * latency to 1.
+		 */
+		if (lat_timeout) {
+			mutex_lock(&p->adap->lock);
+			if (debug)
+				dev_info(splitter->dev,
+					 "port %u: give up on latency for seq %u\n",
+					 p->port,
+					 p->out_request_current_latency_seq & ~(1 << 31));
+			p->video_latency = 1;
+			p->out_request_current_latency_seq = 0;
+			p->out_request_current_latency_ts = ktime_set(0, 0);
+			mutex_unlock(&p->adap->lock);
+			cec_out_report_current_latency(splitter, input_adap);
+		}
+	}
+	return res;
+}

linux-7.2.3/drivers/media/cec/usb/extron-da-hd-4k-plus/cec-splitter.h

@@ -0,0 +1,51 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+/*
+ * Copyright 2021-2024 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
+ */
+
+#ifndef _CEC_SPLITTER_H_
+#define _CEC_SPLITTER_H_
+
+struct cec_splitter;
+
+#define STATE_CHANGE_MAX_REPEATS 2
+
+struct cec_splitter_port {
+	struct cec_splitter *splitter;
+	struct cec_adapter *adap;
+	unsigned int port;
+	bool is_active_source;
+	bool found_sink;
+	ktime_t lost_sink_ts;
+	u32 out_request_current_latency_seq;
+	ktime_t out_request_current_latency_ts;
+	u8 video_latency;
+	u32 out_give_device_power_status_seq;
+	ktime_t out_give_device_power_status_ts;
+	u8 power_status;
+};
+
+struct cec_splitter {
+	struct device *dev;
+	unsigned int num_out_ports;
+	struct cec_splitter_port **ports;
+
+	/* High-level splitter state */
+	u8 request_current_latency_dest;
+	u8 give_device_power_status_dest;
+	bool is_standby;
+};
+
+void cec_splitter_unconfigured_output(struct cec_splitter_port *port);
+void cec_splitter_configured_output(struct cec_splitter_port *port);
+int cec_splitter_received_input(struct cec_splitter_port *port, struct cec_msg *msg);
+int cec_splitter_received_output(struct cec_splitter_port *port, struct cec_msg *msg,
+				 struct cec_adapter *input_adap);
+void cec_splitter_nb_transmit_canceled_output(struct cec_splitter_port *port,
+					      const struct cec_msg *msg,
+					      struct cec_adapter *input_adap);
+bool cec_splitter_poll(struct cec_splitter *splitter,
+		       struct cec_adapter *input_adap, bool debug);
+
+#endif

linux-7.2.3/drivers/media/cec/usb/extron-da-hd-4k-plus/extron-da-hd-4k-plus.h

@@ -0,0 +1,118 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+/*
+ * Copyright 2021-2024 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
+ */
+
+#ifndef _EXTRON_DA_HD_4K_PLUS_H_
+#define _EXTRON_DA_HD_4K_PLUS_H_
+
+#include <linux/kthread.h>
+#include <linux/serio.h>
+#include <linux/workqueue.h>
+#include <media/cec.h>
+#include <media/v4l2-ctrls.h>
+#include <media/v4l2-dev.h>
+#include <media/v4l2-device.h>
+#include <media/v4l2-dv-timings.h>
+#include <media/v4l2-event.h>
+#include <media/v4l2-fh.h>
+#include <media/v4l2-ioctl.h>
+
+#include "cec-splitter.h"
+
+#define DATA_SIZE 256
+
+#define PING_PERIOD	(15 * HZ)
+
+#define NUM_MSGS CEC_MAX_MSG_RX_QUEUE_SZ
+
+#define MAX_PORTS (1 + 6)
+
+#define MAX_EDID_BLOCKS 2
+
+struct extron;
+
+struct extron_port {
+	struct cec_splitter_port port;
+	struct device *dev;
+	struct cec_adapter *adap;
+	struct video_device vdev;
+	struct v4l2_ctrl_handler hdl;
+	struct v4l2_ctrl *ctrl_rx_power_present;
+	struct v4l2_ctrl *ctrl_tx_hotplug;
+	struct v4l2_ctrl *ctrl_tx_edid_present;
+	bool is_input;
+	char direction;
+	char name[26];
+	unsigned char edid[MAX_EDID_BLOCKS * 128];
+	unsigned char edid_tmp[MAX_EDID_BLOCKS * 128];
+	unsigned int edid_blocks;
+	bool read_edid;
+	struct extron *extron;
+	struct work_struct irq_work;
+	struct completion cmd_done;
+	const char *response;
+	unsigned int cmd_error;
+	struct cec_msg rx_msg[NUM_MSGS];
+	unsigned int rx_msg_cur_idx, rx_msg_num;
+	/* protect rx_msg_cur_idx and rx_msg_num */
+	spinlock_t msg_lock;
+	u32 tx_done_status;
+	bool update_phys_addr;
+	u16 phys_addr;
+	bool cec_was_registered;
+	bool disconnected;
+	bool update_has_signal;
+	bool has_signal;
+	bool update_has_edid;
+	bool has_edid;
+	bool has_4kp30;
+	bool has_4kp60;
+	bool has_qy;
+	bool has_qs;
+	u8 est_i, est_ii;
+
+	/* locks access to the video_device */
+	struct mutex video_lock;
+};
+
+struct extron {
+	struct cec_splitter splitter;
+	struct device *dev;
+	struct serio *serio;
+	/* locks access to serio */
+	struct mutex serio_lock;
+	unsigned int num_ports;
+	unsigned int num_in_ports;
+	unsigned int num_out_ports;
+	char unit_name[32];
+	char unit_type[64];
+	char unit_fw_version[32];
+	char unit_cec_engine_version[32];
+	struct extron_port *ports[MAX_PORTS];
+	struct cec_splitter_port *splitter_ports[MAX_PORTS];
+	struct v4l2_device v4l2_dev;
+	bool hpd_never_low;
+	struct task_struct *kthread_setup;
+	struct delayed_work work_update_edid;
+
+	/* serializes EDID reading */
+	struct mutex edid_lock;
+	unsigned int edid_bytes_read;
+	struct extron_port *edid_port;
+	struct completion edid_completion;
+	bool edid_reading;
+	bool is_ready;
+
+	struct completion cmd_done;
+	const char *response;
+	unsigned int cmd_error;
+	char data[DATA_SIZE];
+	unsigned int len;
+	char reply[DATA_SIZE];
+	char buf[DATA_SIZE];
+	unsigned int idx;
+};
+
+#endif