From: Hans Verkuil <hans.verkuil@xxxxxxxxx>
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@xxxxxxxxx>
---
drivers/media/v4l2-core/v4l2-common.c | 48 +++++++++++++++++++++++++++++++++++
include/media/v4l2-common.h | 26 +++++++++++++++++++
2 files changed, 74 insertions(+)
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_ */
--
2.15.1
