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| author | Ezequiel Garcia <ezequiel@collabora.com> | 2018-07-02 17:36:05 +0200 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab+samsung@kernel.org> | 2018-07-04 14:43:47 +0200 |
| commit | be2fff656322e82f215730839063c2c2ca73d14b (patch) | |
| tree | d2611d3d65223d07e2839d7d1f308365819085c9 /include/media | |
| parent | media: mark entity-intf links as IMMUTABLE (diff) | |
| download | linux-be2fff656322e82f215730839063c2c2ca73d14b.tar.xz linux-be2fff656322e82f215730839063c2c2ca73d14b.zip | |
media: add helpers for memory-to-memory media controller
A memory-to-memory pipeline device consists in three
entities: two DMA engine and one video processing entities.
The DMA engine entities are linked to a V4L interface.
This commit add a new v4l2_m2m_{un}register_media_controller
API to register this topology.
For instance, a typical mem2mem device topology would
look like this:
Device topology
- entity 1: source (1 pad, 1 link)
type Node subtype V4L flags 0
pad0: Source
-> "proc":1 [ENABLED,IMMUTABLE]
- entity 3: proc (2 pads, 2 links)
type Node subtype Unknown flags 0
pad0: Source
-> "sink":0 [ENABLED,IMMUTABLE]
pad1: Sink
<- "source":0 [ENABLED,IMMUTABLE]
- entity 6: sink (1 pad, 1 link)
type Node subtype V4L flags 0
pad0: Sink
<- "proc":0 [ENABLED,IMMUTABLE]
[hans.verkuil@cisco.com: mark interface links as IMMUTABLE]
Suggested-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Ezequiel Garcia <ezequiel@collabora.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Diffstat (limited to 'include/media')
| -rw-r--r-- | include/media/v4l2-mem2mem.h | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/include/media/v4l2-mem2mem.h b/include/media/v4l2-mem2mem.h index 8f4b208cfee7..af48b1eca025 100644 --- a/include/media/v4l2-mem2mem.h +++ b/include/media/v4l2-mem2mem.h @@ -47,6 +47,7 @@ struct v4l2_m2m_ops { void (*job_abort)(void *priv); }; +struct video_device; struct v4l2_m2m_dev; /** @@ -322,6 +323,24 @@ int v4l2_m2m_mmap(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, */ struct v4l2_m2m_dev *v4l2_m2m_init(const struct v4l2_m2m_ops *m2m_ops); +#if defined(CONFIG_MEDIA_CONTROLLER) +void v4l2_m2m_unregister_media_controller(struct v4l2_m2m_dev *m2m_dev); +int v4l2_m2m_register_media_controller(struct v4l2_m2m_dev *m2m_dev, + struct video_device *vdev, int function); +#else +static inline void +v4l2_m2m_unregister_media_controller(struct v4l2_m2m_dev *m2m_dev) +{ +} + +static inline int +v4l2_m2m_register_media_controller(struct v4l2_m2m_dev *m2m_dev, + struct video_device *vdev, int function) +{ + return 0; +} +#endif + /** * v4l2_m2m_release() - cleans up and frees a m2m_dev structure * |