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media: subdev: add v4l2_subdev_get_fmt() helper function

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Add v4l2_subdev_get_fmt() helper function which implements
v4l2_subdev_pad_ops.get_fmt using active state. Subdev drivers that
support active state and do not need to do anything special in their
get_fmt op can use this helper directly for v4l2_subdev_pad_ops.get_fmt.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Reviewed-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
This commit is contained in:
Tomi Valkeinen 2022-04-12 10:42:48 +01:00 committed by Mauro Carvalho Chehab
parent b2ac238724
commit 14a6fca77a
2 changed files with 43 additions and 0 deletions
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22
drivers/media/v4l2-core/v4l2-subdev.c
View File

@ -1041,6 +1041,28 @@ void v4l2_subdev_cleanup(struct v4l2_subdev *sd)
}
EXPORT_SYMBOL_GPL(v4l2_subdev_cleanup);
#if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
int v4l2_subdev_get_fmt(struct v4l2_subdev *sd, struct v4l2_subdev_state *state,
struct v4l2_subdev_format *format)
{
struct v4l2_mbus_framefmt *fmt;
if (format->pad >= sd->entity.num_pads)
return -EINVAL;
fmt = v4l2_subdev_get_pad_format(sd, state, format->pad);
if (!fmt)
return -EINVAL;
format->format = *fmt;
return 0;
}
EXPORT_SYMBOL_GPL(v4l2_subdev_get_fmt);
#endif /* CONFIG_VIDEO_V4L2_SUBDEV_API */
#endif /* CONFIG_MEDIA_CONTROLLER */
void v4l2_subdev_init(struct v4l2_subdev *sd, const struct v4l2_subdev_ops *ops)

21
include/media/v4l2-subdev.h
View File

@ -1303,6 +1303,27 @@ v4l2_subdev_lock_and_get_active_state(struct v4l2_subdev *sd)
return sd->active_state;
}
#if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
/**
* v4l2_subdev_get_fmt() - Fill format based on state
* @sd: subdevice
* @state: subdevice state
* @format: pointer to &struct v4l2_subdev_format
*
* Fill @format->format field based on the information in the @format struct.
*
* This function can be used by the subdev drivers which support active state to
* implement v4l2_subdev_pad_ops.get_fmt if the subdev driver does not need to
* do anything special in their get_fmt op.
*
* Returns 0 on success, error value otherwise.
*/
int v4l2_subdev_get_fmt(struct v4l2_subdev *sd, struct v4l2_subdev_state *state,
struct v4l2_subdev_format *format);
#endif /* CONFIG_VIDEO_V4L2_SUBDEV_API */
#endif /* CONFIG_MEDIA_CONTROLLER */
/**