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| author | Hans Verkuil <hans.verkuil@cisco.com> | 2018-01-22 09:58:36 +0100 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@s-opensource.com> | 2018-02-22 18:25:33 +0100 |
| commit | 672de9a79cd34c864f5eca7de5264b2645212605 (patch) | |
| tree | dc33ed580962efb7fdaa0e3bd8b232709a8374f0 | |
| parent | media: v4l2-subdev: clear reserved fields (diff) | |
| download | linux-672de9a79cd34c864f5eca7de5264b2645212605.tar.xz linux-672de9a79cd34c864f5eca7de5264b2645212605.zip | |
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>
| -rw-r--r-- | drivers/media/v4l2-core/v4l2-common.c | 48 | ||||
| -rw-r--r-- | include/media/v4l2-common.h | 26 |
2 files changed, 74 insertions, 0 deletions
diff --git a/drivers/media/v4l2-core/v4l2-common.c b/drivers/media/v4l2-core/v4l2-common.c index 8650ad92b64d..96c1b31de9e3 100644 --- a/drivers/media/v4l2-core/v4l2-common.c +++ b/drivers/media/v4l2-core/v4l2-common.c @@ -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); diff --git a/include/media/v4l2-common.h b/include/media/v4l2-common.h index e0d95a7c5d48..f3aa1d728c0b 100644 --- a/include/media/v4l2-common.h +++ b/include/media/v4l2-common.h @@ -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_ */ |