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media: v4l: Add support for STD ioctls on subdev nodes 

There is no way to control the standard of subdevices which are part of
a media device. The ioctls which exists all target video devices
explicitly and the idea is that the video device should talk to the
subdevice. For subdevices part of a media graph this is not possible and
the standard must be controlled on the subdev device directly.

Add four new ioctls to be able to directly interact with subdevices and
control the video standard; VIDIOC_SUBDEV_ENUMSTD, VIDIOC_SUBDEV_G_STD,
VIDIOC_SUBDEV_S_STD and VIDIOC_SUBDEV_QUERYSTD.

Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
This commit is contained in:
Niklas Söderlund 2018-05-17 10:30:16 -04:00 committed by Mauro Carvalho Chehab
parent be9543ec9e
commit 56ab8cdbc1
5 changed files with 50 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
Documentation/media/uapi/v4l/vidioc-enumstd.rst
View File

@ -2,14 +2,14 @@
.. _VIDIOC_ENUMSTD:
********************
ioctl VIDIOC_ENUMSTD
********************
*******************************************
ioctl VIDIOC_ENUMSTD, VIDIOC_SUBDEV_ENUMSTD
*******************************************
Name
====
VIDIOC_ENUMSTD - Enumerate supported video standards
VIDIOC_ENUMSTD - VIDIOC_SUBDEV_ENUMSTD - Enumerate supported video standards
Synopsis
@ -18,6 +18,9 @@ Synopsis
.. c:function:: int ioctl( int fd, VIDIOC_ENUMSTD, struct v4l2_standard *argp )
:name: VIDIOC_ENUMSTD
.. c:function:: int ioctl( int fd, VIDIOC_SUBDEV_ENUMSTD, struct v4l2_standard *argp )
:name: VIDIOC_SUBDEV_ENUMSTD
Arguments
=========

14
Documentation/media/uapi/v4l/vidioc-g-std.rst
View File

@ -2,14 +2,14 @@
.. _VIDIOC_G_STD:
********************************
ioctl VIDIOC_G_STD, VIDIOC_S_STD
********************************
**************************************************************************
ioctl VIDIOC_G_STD, VIDIOC_S_STD, VIDIOC_SUBDEV_G_STD, VIDIOC_SUBDEV_S_STD
**************************************************************************
Name
====
VIDIOC_G_STD - VIDIOC_S_STD - Query or select the video standard of the current input
VIDIOC_G_STD - VIDIOC_S_STD - VIDIOC_SUBDEV_G_STD - VIDIOC_SUBDEV_S_STD - Query or select the video standard of the current input
Synopsis
@ -21,6 +21,12 @@ Synopsis
.. c:function:: int ioctl( int fd, VIDIOC_S_STD, const v4l2_std_id *argp )
:name: VIDIOC_S_STD
.. c:function:: int ioctl( int fd, VIDIOC_SUBDEV_G_STD, v4l2_std_id *argp )
:name: VIDIOC_SUBDEV_G_STD
.. c:function:: int ioctl( int fd, VIDIOC_SUBDEV_S_STD, const v4l2_std_id *argp )
:name: VIDIOC_SUBDEV_S_STD
Arguments
=========

11
Documentation/media/uapi/v4l/vidioc-querystd.rst
View File

@ -2,14 +2,14 @@
.. _VIDIOC_QUERYSTD:
*********************
ioctl VIDIOC_QUERYSTD
*********************
*********************************************
ioctl VIDIOC_QUERYSTD, VIDIOC_SUBDEV_QUERYSTD
*********************************************
Name
====
VIDIOC_QUERYSTD - Sense the video standard received by the current input
VIDIOC_QUERYSTD - VIDIOC_SUBDEV_QUERYSTD - Sense the video standard received by the current input
Synopsis
@ -18,6 +18,9 @@ Synopsis
.. c:function:: int ioctl( int fd, VIDIOC_QUERYSTD, v4l2_std_id *argp )
:name: VIDIOC_QUERYSTD
.. c:function:: int ioctl( int fd, VIDIOC_SUBDEV_QUERYSTD, v4l2_std_id *argp )
:name: VIDIOC_SUBDEV_QUERYSTD
Arguments
=========

22
drivers/media/v4l2-core/v4l2-subdev.c
View File

@ -494,6 +494,28 @@ static long subdev_do_ioctl(struct file *file, unsigned int cmd, void *arg)
case VIDIOC_SUBDEV_S_DV_TIMINGS:
return v4l2_subdev_call(sd, video, s_dv_timings, arg);
case VIDIOC_SUBDEV_G_STD:
return v4l2_subdev_call(sd, video, g_std, arg);
case VIDIOC_SUBDEV_S_STD: {
v4l2_std_id *std = arg;
return v4l2_subdev_call(sd, video, s_std, *std);
}
case VIDIOC_SUBDEV_ENUMSTD: {
struct v4l2_standard *p = arg;
v4l2_std_id id;
if (v4l2_subdev_call(sd, video, g_tvnorms, &id))
return -EINVAL;
return v4l_video_std_enumstd(p, id);
}
case VIDIOC_SUBDEV_QUERYSTD:
return v4l2_subdev_call(sd, video, querystd, arg);
#endif
default:
return v4l2_subdev_call(sd, core, ioctl, cmd, arg);

4
include/uapi/linux/v4l2-subdev.h
View File

@ -170,8 +170,12 @@ struct v4l2_subdev_selection {
#define VIDIOC_SUBDEV_G_SELECTION _IOWR('V', 61, struct v4l2_subdev_selection)
#define VIDIOC_SUBDEV_S_SELECTION _IOWR('V', 62, struct v4l2_subdev_selection)
/* The following ioctls are identical to the ioctls in videodev2.h */
#define VIDIOC_SUBDEV_G_STD _IOR('V', 23, v4l2_std_id)
#define VIDIOC_SUBDEV_S_STD _IOW('V', 24, v4l2_std_id)
#define VIDIOC_SUBDEV_ENUMSTD _IOWR('V', 25, struct v4l2_standard)
#define VIDIOC_SUBDEV_G_EDID _IOWR('V', 40, struct v4l2_edid)
#define VIDIOC_SUBDEV_S_EDID _IOWR('V', 41, struct v4l2_edid)
#define VIDIOC_SUBDEV_QUERYSTD _IOR('V', 63, v4l2_std_id)
#define VIDIOC_SUBDEV_S_DV_TIMINGS _IOWR('V', 87, struct v4l2_dv_timings)
#define VIDIOC_SUBDEV_G_DV_TIMINGS _IOWR('V', 88, struct v4l2_dv_timings)
#define VIDIOC_SUBDEV_ENUM_DV_TIMINGS _IOWR('V', 98, struct v4l2_enum_dv_timings)