V4L/DVB (12400): em28xx: Allow changing fps on webcams

em28xx doesn't have temporal scaling. However, on webcams, sensors are
capable of changing the output rate. So, VIDIOC_[G|S]_PARM ioctls should
be passed to the sensor for it to properly set frame rate.

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

diff --git a/drivers/media/video/em28xx/em28xx-video.c b/drivers/media/video/em28xx/em28xx-video.c
index ff37b4c..92ee9c6 100644 (file)
--- a/drivers/media/video/em28xx/em28xx-video.c
+++ b/drivers/media/video/em28xx/em28xx-video.c
@@ -846,6 +846,41 @@ static int vidioc_s_std(struct file *file, void *priv, v4l2_std_id *norm)
        return 0;
 }
 
+static int vidioc_g_parm(struct file *file, void *priv,
+                        struct v4l2_streamparm *p)
+{
+       struct em28xx_fh   *fh  = priv;
+       struct em28xx      *dev = fh->dev;
+       int rc = 0;
+
+       if (p->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
+               return -EINVAL;
+
+       if (dev->board.is_webcam)
+               rc = v4l2_device_call_until_err(&dev->v4l2_dev, 0,
+                                               video, g_parm, p);
+       else
+               v4l2_video_std_frame_period(dev->norm,
+                                                &p->parm.capture.timeperframe);
+
+       return rc;
+}
+
+static int vidioc_s_parm(struct file *file, void *priv,
+                        struct v4l2_streamparm *p)
+{
+       struct em28xx_fh   *fh  = priv;
+       struct em28xx      *dev = fh->dev;
+
+       if (!dev->board.is_webcam)
+               return -EINVAL;
+
+       if (p->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
+               return -EINVAL;
+
+       return v4l2_device_call_until_err(&dev->v4l2_dev, 0, video, s_parm, p);
+}
+
 static const char *iname[] = {
        [EM28XX_VMUX_COMPOSITE1] = "Composite1",
        [EM28XX_VMUX_COMPOSITE2] = "Composite2",
@@ -1885,6 +1920,8 @@ static const struct v4l2_ioctl_ops video_ioctl_ops = {
        .vidioc_qbuf                = vidioc_qbuf,
        .vidioc_dqbuf               = vidioc_dqbuf,
        .vidioc_s_std               = vidioc_s_std,
+       .vidioc_g_parm              = vidioc_g_parm,
+       .vidioc_s_parm              = vidioc_s_parm,
        .vidioc_enum_input          = vidioc_enum_input,
        .vidioc_g_input             = vidioc_g_input,
        .vidioc_s_input             = vidioc_s_input,