Add a new field to enable_source handler to find source entity
for the sink 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 the handler 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 the using media_entity_setup_link() if it is available.
This hanlder can be invoked from 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 | 12 ++++++++++++
1 file changed, 12 insertions(+)
diff --git a/include/media/media-device.h b/include/media/media-device.h
index e73642c..377102b 100644
--- a/include/media/media-device.h
+++ b/include/media/media-device.h
@@ -84,6 +84,18 @@ struct media_device {
/* Serializes graph operations. */
spinlock_t graph_lock;
+ /* Handler to find source entity for the sink 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 the
+ * handler when media_device is registered or when
+ * bridge driver finds the media_device during probe.
+ *
+ * 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.
+ */
+ int (*enable_source)(struct media_entity *sink);
int (*link_notify)(struct media_link *link, u32 flags,
unsigned int notification);
};
--
2.1.4
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