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media: v4l2-subdev: Add v4l2_subdev_s_stream_helper() function

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The v4l2_subdev_s_stream_helper() helper can be used by subdevs that
implement the stream-aware .enable_streams() and .disable_streams()
operations to implement .s_stream(). This is limited to subdevs that
have a single source pad.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
This commit is contained in:
Laurent Pinchart
2022-01-18 01:16:14 +01:00
committed by Mauro Carvalho Chehab
parent d0749adb30
commit 34a315ce0e
2 changed files with 57 additions and 0 deletions
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17
include/media/v4l2-subdev.h
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@@ -1731,6 +1731,23 @@ int v4l2_subdev_enable_streams(struct v4l2_subdev *sd, u32 pad,
int v4l2_subdev_disable_streams(struct v4l2_subdev *sd, u32 pad,
u64 streams_mask);
/**
* v4l2_subdev_s_stream_helper() - Helper to implement the subdev s_stream
* operation using enable_streams and disable_streams
* @sd: The subdevice
* @enable: Enable or disable streaming
*
* Subdevice drivers that implement the streams-aware
* &v4l2_subdev_pad_ops.enable_streams and &v4l2_subdev_pad_ops.disable_streams
* operations can use this helper to implement the legacy
* &v4l2_subdev_video_ops.s_stream operation.
*
* This helper can only be used by subdevs that have a single source pad.
*
* Return: 0 on success, or a negative error code otherwise.
*/
int v4l2_subdev_s_stream_helper(struct v4l2_subdev *sd, int enable);
#endif /* CONFIG_VIDEO_V4L2_SUBDEV_API */
#endif /* CONFIG_MEDIA_CONTROLLER */