[PATCH 04/31] media: Media Controller enable/disable source handler API

From: Shuah Khan
Date: Wed Jan 06 2016 - 15:58:10 EST


Add new fields to struct media_device to add enable_source, and
disable_source handlers, and source_priv to stash driver private
data that is need to run these handlers. The enable_source handler
finds source entity for the passed in entity and check if it is
available, and activate the link using __media_entity_setup_link()
interface. Bridge driver is expected to implement and set these
handlers and private data when media_device is registered or when
bridge driver finds the media_device during probe. This is to enable
the use-case to find tuner entity connected to the decoder entity and
check if it is available, and activate it and start pipeline between
the source and the entity. The disable_source handler deactivates the
link and stops the pipeline. This handler can be invoked from the
media core (v4l-core, dvb-core) as well as other drivers such as ALSA
that control the media device.

Signed-off-by: Shuah Khan <shuahkh@xxxxxxxxxxxxxxx>
---
include/media/media-device.h | 19 +++++++++++++++++++
1 file changed, 19 insertions(+)

diff --git a/include/media/media-device.h b/include/media/media-device.h
index 6520d1c..04b6c2e 100644
--- a/include/media/media-device.h
+++ b/include/media/media-device.h
@@ -333,6 +333,25 @@ struct media_device {
/* Serializes graph operations. */
struct mutex graph_mutex;

+ /* Handlers to find source entity for the sink entity and
+ * check if it is available, and activate the link using
+ * media_entity_setup_link() interface and start pipeline
+ * from the source to the entity.
+ * Bridge driver is expected to implement and set the
+ * handler when media_device is registered or when
+ * bridge driver finds the media_device during probe.
+ * Bridge driver sets source_priv with information
+ * necessary to run enable/disable source handlers.
+ *
+ * Use-case: find tuner entity connected to the decoder
+ * entity and check if it is available, and activate the
+ * using media_entity_setup_link() if it is available.
+ */
+ void *source_priv;
+ int (*enable_source)(struct media_entity *entity,
+ struct media_pipeline *pipe);
+ void (*disable_source)(struct media_entity *entity);
+
int (*link_notify)(struct media_link *link, u32 flags,
unsigned int notification);
};
--
2.5.0

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/