Em Wed, 6 Jan 2016 13:26:53 -0700
Shuah Khan <shuahkh@xxxxxxxxxxxxxxx> 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@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);
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);
> };
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