Add change_source handler function pointer to struct media_device. Using
the change_source handler, driver can disable current source and enable
new one in one step when user selects a new input.
Signed-off-by: Shuah Khan <shuahkh@xxxxxxxxxxxxxxx>
---
include/media/media-device.h | 18 +++++++++++++++---
1 file changed, 15 insertions(+), 3 deletions(-)
diff --git a/include/media/media-device.h b/include/media/media-device.h
index df74cfa..d9867ed 100644
--- a/include/media/media-device.h
+++ b/include/media/media-device.h
@@ -309,9 +309,11 @@ struct media_entity_notify {
* @pm_count_walk: Graph walk for power state walk. Access serialised using
* graph_mutex.
*
- * @source_priv: Driver Private data for enable/disable source handlers
+ * @source_priv: Driver Private data for enable/disable/change source
+ * handlers
* @enable_source: Enable Source Handler function pointer
* @disable_source: Disable Source Handler function pointer
+ * @change_source: Change Source Handler function pointer
*
* @link_notify: Link state change notification callback
*
@@ -326,14 +328,22 @@ struct media_entity_notify {
* be unique.
*
* @enable_source is a handler to find source entity for the
- * sink entity and activate the link between them if source
+ * 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
+ * sink entity and deactivate the link between them. Drivers
* should call this handler to release the source.
*
+ * @change_source is a handler to find source entity for the
+ * sink entity and deactivate the link between them. Once the
+ * existing link is deactivated, it will find and activate the
+ * source for the sink for the newly selected input. Drivers
+ * should call this handler to change the source when user
+ * changes input. Using change_source helps not loose the hold
+ * on the media resource when a new input is selected.
+ *
* 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.
@@ -381,6 +391,8 @@ struct media_device {
int (*enable_source)(struct media_entity *entity,
struct media_pipeline *pipe);
void (*disable_source)(struct media_entity *entity);
+ int (*change_source)(struct media_entity *entity,
+ struct media_pipeline *pipe);
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-media" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
