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media: v4l2-common: create v4l2_g/s_parm_cap helpers 

Create helpers to handle VIDIOC_G/S_PARM by querying the
g/s_frame_interval v4l2_subdev ops.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
This commit is contained in:
Hans Verkuil 2018-01-22 03:58:36 -05:00 committed by Mauro Carvalho Chehab
parent 7c8a940a5e
commit 672de9a79c
2 changed files with 74 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

48
drivers/media/v4l2-core/v4l2-common.c
View File

@ -392,3 +392,51 @@ void v4l2_get_timestamp(struct timeval *tv)
tv->tv_usec = ts.tv_nsec / NSEC_PER_USEC;
}
EXPORT_SYMBOL_GPL(v4l2_get_timestamp);
int v4l2_g_parm_cap(struct video_device *vdev,
struct v4l2_subdev *sd, struct v4l2_streamparm *a)
{
struct v4l2_subdev_frame_interval ival = { 0 };
int ret;
if (a->type != V4L2_BUF_TYPE_VIDEO_CAPTURE &&
a->type != V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE)
return -EINVAL;
if (vdev->device_caps & V4L2_CAP_READWRITE)
a->parm.capture.readbuffers = 2;
if (v4l2_subdev_has_op(sd, video, g_frame_interval))
a->parm.capture.capability = V4L2_CAP_TIMEPERFRAME;
ret = v4l2_subdev_call(sd, video, g_frame_interval, &ival);
if (!ret)
a->parm.capture.timeperframe = ival.interval;
return ret;
}
EXPORT_SYMBOL_GPL(v4l2_g_parm_cap);
int v4l2_s_parm_cap(struct video_device *vdev,
struct v4l2_subdev *sd, struct v4l2_streamparm *a)
{
struct v4l2_subdev_frame_interval ival = {
.interval = a->parm.capture.timeperframe
};
int ret;
if (a->type != V4L2_BUF_TYPE_VIDEO_CAPTURE &&
a->type != V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE)
return -EINVAL;
memset(&a->parm, 0, sizeof(a->parm));
if (vdev->device_caps & V4L2_CAP_READWRITE)
a->parm.capture.readbuffers = 2;
else
a->parm.capture.readbuffers = 0;
if (v4l2_subdev_has_op(sd, video, g_frame_interval))
a->parm.capture.capability = V4L2_CAP_TIMEPERFRAME;
ret = v4l2_subdev_call(sd, video, s_frame_interval, &ival);
if (!ret)
a->parm.capture.timeperframe = ival.interval;
return ret;
}
EXPORT_SYMBOL_GPL(v4l2_s_parm_cap);

26
include/media/v4l2-common.h
View File

@ -341,4 +341,30 @@ v4l2_find_nearest_format(const struct v4l2_frmsize_discrete *sizes,
*/
void v4l2_get_timestamp(struct timeval *tv);
/**
* v4l2_g_parm_cap - helper routine for vidioc_g_parm to fill this in by
* calling the g_frame_interval op of the given subdev. It only works
* for V4L2_BUF_TYPE_VIDEO_CAPTURE(_MPLANE), hence the _cap in the
* function name.
*
* @vdev: the struct video_device pointer. Used to determine the device caps.
* @sd: the sub-device pointer.
* @a: the VIDIOC_G_PARM argument.
*/
int v4l2_g_parm_cap(struct video_device *vdev,
struct v4l2_subdev *sd, struct v4l2_streamparm *a);
/**
* v4l2_s_parm_cap - helper routine for vidioc_s_parm to fill this in by
* calling the s_frame_interval op of the given subdev. It only works
* for V4L2_BUF_TYPE_VIDEO_CAPTURE(_MPLANE), hence the _cap in the
* function name.
*
* @vdev: the struct video_device pointer. Used to determine the device caps.
* @sd: the sub-device pointer.
* @a: the VIDIOC_S_PARM argument.
*/
int v4l2_s_parm_cap(struct video_device *vdev,
struct v4l2_subdev *sd, struct v4l2_streamparm *a);
#endif /* V4L2_COMMON_H_ */