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Commit 672de9a7 authored by Hans Verkuil's avatar Hans Verkuil Committed by Mauro Carvalho Chehab
Browse files

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: default avatarHans Verkuil <hans.verkuil@cisco.com>
Acked-by: default avatarSakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@s-opensource.com>
parent 7c8a940a

drivers/media/v4l2-core/v4l2-common.c

+48 −0
Original line number Original line Diff line number Diff line
@@ -392,3 +392,51 @@ void v4l2_get_timestamp(struct timeval *tv) 
	tv->tv_usec = ts.tv_nsec / NSEC_PER_USEC;

	tv->tv_usec = ts.tv_nsec / NSEC_PER_USEC;

}

}

EXPORT_SYMBOL_GPL(v4l2_get_timestamp);

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);

include/media/v4l2-common.h

+26 −0
Original line number Original line Diff line number Diff line
@@ -341,4 +341,30 @@ v4l2_find_nearest_format(const struct v4l2_frmsize_discrete *sizes, 
 */

 */

void v4l2_get_timestamp(struct timeval *tv);

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_ */
 
#endif /* V4L2_COMMON_H_ */