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media: v4l2-ioctl: create helper to fill in v4l2_standard for ENUMSTD

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Prepare for adding a new IOCTL VIDIOC_SUBDEV_ENUMSTD which would
enumerate the standards for a subdevice by breaking out the code which
could be shared between the video and subdevice versions of this IOCTL.

Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
[hans.verkuil@cisco.com: fixed 'sdandard' typos in v4l2-ioctl.h]
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
This commit is contained in:
Niklas Söderlund
2018-05-17 10:30:15 -04:00
committed by Mauro Carvalho Chehab
parent 39fb993038
commit aa2f887127
2 changed files with 50 additions and 31 deletions
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15
include/media/v4l2-ioctl.h
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@@ -621,7 +621,7 @@ const char *v4l2_norm_to_name(v4l2_std_id id);
* v4l2_video_std_frame_period - Ancillary routine that fills a
* struct &v4l2_fract pointer with the default framerate fraction.
*
* @id: analog TV sdandard ID.
* @id: analog TV standard ID.
* @frameperiod: struct &v4l2_fract pointer to be filled
*
*/
@@ -632,7 +632,7 @@ void v4l2_video_std_frame_period(int id, struct v4l2_fract *frameperiod);
* a &v4l2_standard structure according to the @id parameter.
*
* @vs: struct &v4l2_standard pointer to be filled
* @id: analog TV sdandard ID.
* @id: analog TV standard ID.
* @name: name of the standard to be used
*
* .. note::
@@ -642,6 +642,17 @@ void v4l2_video_std_frame_period(int id, struct v4l2_fract *frameperiod);
int v4l2_video_std_construct(struct v4l2_standard *vs,
int id, const char *name);
/**
* v4l_video_std_enumstd - Ancillary routine that fills in the fields of
* a &v4l2_standard structure according to the @id and @vs->index
* parameters.
*
* @vs: struct &v4l2_standard pointer to be filled.
* @id: analog TV standard ID.
*
*/
int v4l_video_std_enumstd(struct v4l2_standard *vs, v4l2_std_id id);
/**
* v4l_printk_ioctl - Ancillary routine that prints the ioctl in a
* human-readable format.