[media] v4l: v4l2_subdev userspace frame interval API

The three new ioctl VIDIOC_SUBDEV_ENUM_FRAME_INTERVAL,
VIDIOC_SUBDEV_G_FRAME_INTERVAL and VIDIOC_SUBDEV_S_FRAME_INTERVAL can be
used to enumerate and configure a subdev's frame rate from userspace.

Two new video::g/s_frame_interval subdev operations are introduced to
support those ioctls. The existing video::g/s_parm operations are
deprecated and shouldn't be used anymore.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Sakari Ailus <sakari.ailus@iki.fi>
Acked-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 16 insertions, 0 deletions

diff --git a/drivers/media/video/v4l2-subdev.c b/drivers/media/video/v4l2-subdev.c
index 207cc5cceb29..a4a12563ec3c 100644
--- a/drivers/media/video/v4l2-subdev.c
+++ b/drivers/media/video/v4l2-subdev.c
@@ -232,6 +232,22 @@ static long subdev_do_ioctl(struct file *file, unsigned int cmd, void *arg)
                 return v4l2_subdev_call(sd, pad, enum_frame_size, subdev_fh,
                                         fse);
         }
+
+        case VIDIOC_SUBDEV_G_FRAME_INTERVAL:
+                return v4l2_subdev_call(sd, video, g_frame_interval, arg);
+
+        case VIDIOC_SUBDEV_S_FRAME_INTERVAL:
+                return v4l2_subdev_call(sd, video, s_frame_interval, arg);
+
+        case VIDIOC_SUBDEV_ENUM_FRAME_INTERVAL: {
+                struct v4l2_subdev_frame_interval_enum *fie = arg;
+
+                if (fie->pad >= sd->entity.num_pads)
+                        return -EINVAL;
+
+                return v4l2_subdev_call(sd, pad, enum_frame_interval, subdev_fh,
+                                        fie);
+        }
 #endif
         default:
                 return -ENOIOCTLCMD;