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

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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>
This commit is contained in:
Mauro Carvalho Chehab 2009-08-06 21:53:59 -03:00
parent 83053f7fe3
commit d96ecda63f
1 changed files with 37 additions and 0 deletions
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37
drivers/media/video/em28xx/em28xx-video.c
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@ -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,