Em Wed, 6 Jan 2016 13:26:53 -0700 Shuah Khan shuahkh@osg.samsung.com escreveu:
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@osg.samsung.com
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);
Please document the new fields at the right place (Kernel-doc comment declared before the struct).
Is this used by the media core? If so, please but the implementation here, to make it clearer why we need those things.
- int (*link_notify)(struct media_link *link, u32 flags, unsigned int notification);
};