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authorEzequiel Garcia <ezequiel@collabora.com>2018-07-02 11:36:05 -0400
committerMauro Carvalho Chehab <mchehab+samsung@kernel.org>2018-07-04 08:43:47 -0400
commitbe2fff656322e82f215730839063c2c2ca73d14b (patch)
treed2611d3d65223d07e2839d7d1f308365819085c9 /include/media
parent4d1e4545a65903a09f5d15d32a3fbb6131a8d11e (diff)
downloadlinux-be2fff656322e82f215730839063c2c2ca73d14b.tar.bz2
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.h19
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
*