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| author | Laurent Pinchart <laurent.pinchart@ideasonboard.com> | 2022-06-14 22:11:10 +0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@kernel.org> | 2022-07-17 13:23:51 +0300 |
| commit | 03b282861ca737b7e2dfb9a1e4a2a4a7e3594688 (patch) | |
| tree | 3ffef33f6bc21ac7cd7e94c38987de12ff919d14 /include/media | |
| parent | 5680fe45d66bbef32a902c04889a523fa4fc33ba (diff) | |
| download | linux-03b282861ca737b7e2dfb9a1e4a2a4a7e3594688.tar.xz | |
media: mc-entity: Add a new helper function to get a remote pad for a pad
The newly added media_entity_remote_source_pad_unique() helper function
handles use cases where the entity has a link enabled uniqueness
constraint covering all pads. There are use cases where the constraint
covers a specific pad only. Add a new media_pad_remote_pad_unique()
function to handle this. It operates as
media_entity_remote_source_pad_unique(), but on a given pad instead of
on the entity.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Acked-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
Diffstat (limited to 'include/media')
| -rw-r--r-- | include/media/media-entity.h | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/include/media/media-entity.h b/include/media/media-entity.h index c5618f7c1408..f16ffe70f7a6 100644 --- a/include/media/media-entity.h +++ b/include/media/media-entity.h @@ -860,6 +860,24 @@ struct media_link *media_entity_find_link(struct media_pad *source, struct media_pad *media_pad_remote_pad_first(const struct media_pad *pad); /** + * media_pad_remote_pad_unique - Find a remote pad connected to a pad + * @pad: The pad + * + * Search for and return a remote pad connected to @pad through an enabled + * link. If multiple (or no) remote pads are found, an error is returned. + * + * The uniqueness constraint makes this helper function suitable for entities + * that support a single active source at a time on a given pad. + * + * Return: A pointer to the remote pad, or one of the following error pointers + * if an error occurs: + * + * * -ENOTUNIQ - Multiple links are enabled + * * -ENOLINK - No connected pad found + */ +struct media_pad *media_pad_remote_pad_unique(const struct media_pad *pad); + +/** * media_entity_remote_pad_unique - Find a remote pad connected to an entity * @entity: The entity * @type: The type of pad to find (MEDIA_PAD_FL_SINK or MEDIA_PAD_FL_SOURCE) |