[media] media-entitiy: add a function to create multiple links

Sometimes, it is desired to create 1:n and n:1 or even
n:n links between different entities with the same
function.

This is actually needed to support DVB devices that
have multiple frontends. While we could do a function
like that internally at the DVB core, such function is
generic enough to be at media-entity, and it could be
useful on some other places.

So, add such function.

Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

1 files changed, 51 insertions, 0 deletions

diff --git a/include/media/media-entity.h b/include/media/media-entity.h
index 79dd81f..fe485d3 100644
--- a/include/media/media-entity.h
+++ b/include/media/media-entity.h
@@ -613,6 +613,57 @@ static inline void media_entity_cleanup(struct media_entity *entity) {};
 __must_check int media_create_pad_link(struct media_entity *source,
 			u16 source_pad, struct media_entity *sink,
 			u16 sink_pad, u32 flags);
+
+/**
+ * media_create_pad_links() - creates a link between two entities.
+ *
+ * @mdev: Pointer to the media_device that contains the object
+ * @source_function: Function of the source entities. Used only if @source is
+ *	NULL.
+ * @source: pointer to &media_entity of the source pad. If NULL, it will use
+ * 	all entities that matches the @sink_function.
+ * @source_pad: number of the source pad in the pads array
+ * @sink_function: Function of the sink entities. Used only if @sink is NULL.
+ * @sink: pointer to &media_entity of the sink pad. If NULL, it will use
+ * 	all entities that matches the @sink_function.
+ * @sink_pad: number of the sink pad in the pads array.
+ * @flags: Link flags, as defined in include/uapi/linux/media.h.
+ * @allow_both_undefined: if true, then both @source and @sink can be NULL.
+ *	In such case, it will create a crossbar between all entities that
+ *	matches @source_function to all entities that matches @sink_function.
+ *	If false, it will return 0 and won't create any link if both @source
+ *	and @sink are NULL.
+ *
+ * Valid values for flags:
+ * A %MEDIA_LNK_FL_ENABLED flag indicates that the link is enabled and can be
+ *	used to transfer media data. If multiple links are created and this
+ *	flag is passed as an argument, only the first created link will have
+ *	this flag.
+ *
+ * A %MEDIA_LNK_FL_IMMUTABLE flag indicates that the link enabled state can't
+ *	be modified at runtime. If %MEDIA_LNK_FL_IMMUTABLE is set, then
+ *	%MEDIA_LNK_FL_ENABLED must also be set since an immutable link is
+ *	always enabled.
+ *
+ * It is common for some devices to have multiple source and/or sink entities
+ * of the same type that should be linked. While media_create_pad_link()
+ * creates link by link, this function is meant to allow 1:n, n:1 and even
+ * cross-bar (n:n) links.
+ *
+ * NOTE: Before calling this function, media_entity_pads_init() and
+ * media_device_register_entity() should be called previously for the entities
+ * to be linked.
+ */
+int media_create_pad_links(const struct media_device *mdev,
+			   const u32 source_function,
+			   struct media_entity *source,
+			   const u16 source_pad,
+			   const u32 sink_function,
+			   struct media_entity *sink,
+			   const u16 sink_pad,
+			   u32 flags,
+			   const bool allow_both_undefined);
+
 void __media_entity_remove_links(struct media_entity *entity);
 
 /**