diff options
Diffstat (limited to 'include/media')
| -rw-r--r-- | include/media/media-device.h | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/include/media/media-device.h b/include/media/media-device.h index 5436c954281b..0b946a895c3a 100644 --- a/include/media/media-device.h +++ b/include/media/media-device.h @@ -306,6 +306,11 @@ struct media_entity_notify { * @entity_notify: List of registered entity_notify callbacks * @lock: Entities list lock * @graph_mutex: Entities graph operation lock + * + * @source_priv: Driver Private data for enable/disable source handlers + * @enable_source: Enable Source Handler function pointer + * @disable_source: Disable Source Handler function pointer + * * @link_notify: Link state change notification callback * * This structure represents an abstract high-level media device. It allows easy @@ -317,6 +322,26 @@ struct media_entity_notify { * * @model is a descriptive model name exported through sysfs. It doesn't have to * be unique. + * + * @enable_source is a handler to find source entity for the + * sink entity and activate the link between them if source + * entity is free. Drivers should call this handler before + * accessing the source. + * + * @disable_source is a handler to find source entity for the + * sink entity and deactivate the link between them. Drivers + * should call this handler to release the source. + * + * Note: 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 + * the link between them from enable_source and deactivate + * from disable_source. */ struct media_device { /* dev->driver_data points to this struct. */ @@ -349,6 +374,11 @@ struct media_device { /* Serializes graph operations. */ struct mutex graph_mutex; + 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); }; |