[media] cec: add proper support for CDC-Only CEC devices (f2a6b606) · Commits · e / devices / android_kernel_sony_msm8998

drivers/staging/media/cec/TODO

+0 −4

Original line number	Diff line number	Diff line
		TODOs:

		- Should CEC_LOG_ADDR_TYPE_SPECIFIC be replaced by TYPE_2ND_TV and TYPE_PROCESSOR?
		And also TYPE_SWITCH and TYPE_CDC_ONLY in addition to the TYPE_UNREGISTERED?
		This should give the framework more information about the device type
		since SPECIFIC and UNREGISTERED give no useful information.
		- Once this is out of staging this should no longer be a separate
		config option, instead it should be selected by drivers that want it.
		- Revisit the IS_REACHABLE(RC_CORE): perhaps the RC_CORE support should

drivers/staging/media/cec/cec-adap.c

+30 −1

Original line number	Diff line number	Diff line
		@@ -1233,7 +1233,8 @@ configured:
		mutex_unlock(&adap->lock);

		for (i = 0; i < las->num_log_addrs; i++) {
		if (las->log_addr[i] == CEC_LOG_ADDR_INVALID)
		if (las->log_addr[i] == CEC_LOG_ADDR_INVALID \|\|
		(las->flags & CEC_LOG_ADDRS_FL_CDC_ONLY))
		continue;

		/*
		@@ -1355,6 +1356,29 @@ int __cec_s_log_addrs(struct cec_adapter *adap,
		return 0;
		}

		if (log_addrs->flags & CEC_LOG_ADDRS_FL_CDC_ONLY) {
		/*
		* Sanitize log_addrs fields if a CDC-Only device is
		* requested.
		*/
		log_addrs->num_log_addrs = 1;
		log_addrs->osd_name[0] = '\0';
		log_addrs->vendor_id = CEC_VENDOR_ID_NONE;
		log_addrs->log_addr_type[0] = CEC_LOG_ADDR_TYPE_UNREGISTERED;
		/*
		* This is just an internal convention since a CDC-Only device
		* doesn't have to be a switch. But switches already use
		* unregistered, so it makes some kind of sense to pick this
		* as the primary device. Since a CDC-Only device never sends
		* any 'normal' CEC messages this primary device type is never
		* sent over the CEC bus.
		*/
		log_addrs->primary_device_type[0] = CEC_OP_PRIM_DEVTYPE_SWITCH;
		log_addrs->all_device_types[0] = 0;
		log_addrs->features[0][0] = 0;
		log_addrs->features[0][1] = 0;
		}

		/* Ensure the osd name is 0-terminated */
		log_addrs->osd_name[sizeof(log_addrs->osd_name) - 1] = '\0';

		@@ -1575,6 +1599,11 @@ static int cec_receive_notify(struct cec_adapter adap, struct cec_msg msg,

		dprintk(1, "cec_receive_notify: %*ph\n", 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)

drivers/staging/media/cec/cec-api.c

+8 −1

Original line number	Diff line number	Diff line
		@@ -163,7 +163,8 @@ static long cec_adap_s_log_addrs(struct cec_adapter adap, struct cec_fh fh,
		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_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) &&
		@@ -190,6 +191,12 @@ static long cec_transmit(struct cec_adapter adap, struct cec_fh fh,
		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;

		msg.flags &= CEC_MSG_FL_REPLY_TO_FOLLOWERS;
		mutex_lock(&adap->lock);
		if (!adap->is_configured)

include/linux/cec.h

+52 −0

Original line number	Diff line number	Diff line
		@@ -396,6 +396,8 @@ struct cec_log_addrs {
		#define CEC_LOG_ADDRS_FL_ALLOW_UNREG_FALLBACK (1 << 0)
		/* Passthrough RC messages to the input subsystem */
		#define CEC_LOG_ADDRS_FL_ALLOW_RC_PASSTHRU (1 << 1)
		/* CDC-Only device: supports only CDC messages */
		#define CEC_LOG_ADDRS_FL_CDC_ONLY (1 << 2)

		/* Events */

		@@ -1016,4 +1018,54 @@ struct cec_event {
		#define CEC_OP_HPD_ERROR_OTHER 3
		#define CEC_OP_HPD_ERROR_NONE_NO_VIDEO 4

		/* End of Messages */

		/* Helper functions to identify the 'special' CEC devices */

		static inline bool cec_is_2nd_tv(const struct cec_log_addrs *las)
		{
		/*
		* It is a second TV if the logical address is 14 or 15 and the
		* primary device type is a TV.
		*/
		return las->num_log_addrs &&
		las->log_addr[0] >= CEC_LOG_ADDR_SPECIFIC &&
		las->primary_device_type[0] == CEC_OP_PRIM_DEVTYPE_TV;
		}

		static inline bool cec_is_processor(const struct cec_log_addrs *las)
		{
		/*
		* It is a processor if the logical address is 12-15 and the
		* primary device type is a Processor.
		*/
		return las->num_log_addrs &&
		las->log_addr[0] >= CEC_LOG_ADDR_BACKUP_1 &&
		las->primary_device_type[0] == CEC_OP_PRIM_DEVTYPE_PROCESSOR;
		}

		static inline bool cec_is_switch(const struct cec_log_addrs *las)
		{
		/*
		* It is a switch if the logical address is 15 and the
		* primary device type is a Switch and the CDC-Only flag is not set.
		*/
		return las->num_log_addrs == 1 &&
		las->log_addr[0] == CEC_LOG_ADDR_UNREGISTERED &&
		las->primary_device_type[0] == CEC_OP_PRIM_DEVTYPE_SWITCH &&
		!(las->flags & CEC_LOG_ADDRS_FL_CDC_ONLY);
		}

		static inline bool cec_is_cdc_only(const struct cec_log_addrs *las)
		{
		/*
		* It is a CDC-only device if the logical address is 15 and the
		* primary device type is a Switch and the CDC-Only flag is set.
		*/
		return las->num_log_addrs == 1 &&
		las->log_addr[0] == CEC_LOG_ADDR_UNREGISTERED &&
		las->primary_device_type[0] == CEC_OP_PRIM_DEVTYPE_SWITCH &&
		(las->flags & CEC_LOG_ADDRS_FL_CDC_ONLY);
		}

		#endif