On Tuesday 20 October 2009 14:22:03 Laurent Pinchart wrote:
> On Friday 16 October 2009 22:26:53 Hans Verkuil wrote:
> > On Friday 16 October 2009 14:26:52 Laurent Pinchart wrote:
> > > Hi,
> > >
> > > On Friday 16 October 2009 12:19:20 hvaibhav@xxxxxx wrote:
> > > > From: Vaibhav Hiremath <hvaibhav@xxxxxx>
> > > >
> > > >
> > > > Signed-off-by: Vaibhav Hiremath <hvaibhav@xxxxxx>
> > > > ---
> > > > drivers/media/video/v4l2-ioctl.c | 19 +++++++++++++++++++
> > > > include/linux/videodev2.h | 14 ++++++++++++++
> > > > include/media/v4l2-ioctl.h | 4 ++++
> > > > 3 files changed, 37 insertions(+), 0 deletions(-)
> > > >
> > > > diff --git a/drivers/media/video/v4l2-ioctl.c
> > > > b/drivers/media/video/v4l2-ioctl.c index 30cc334..d3140e0 100644
> > > > --- a/drivers/media/video/v4l2-ioctl.c
> > > > +++ b/drivers/media/video/v4l2-ioctl.c
> > > > @@ -284,6 +284,8 @@ static const char *v4l2_ioctls[] = {
> > > > [_IOC_NR(VIDIOC_DBG_G_CHIP_IDENT)] = "VIDIOC_DBG_G_CHIP_IDENT",
> > > > [_IOC_NR(VIDIOC_S_HW_FREQ_SEEK)] = "VIDIOC_S_HW_FREQ_SEEK",
> > > > #endif
> > > > + [_IOC_NR(VIDIOC_S_COLOR_SPACE_CONV)] = "VIDIOC_S_COLOR_SPACE_CONV",
> > > > + [_IOC_NR(VIDIOC_G_COLOR_SPACE_CONV)] = "VIDIOC_G_COLOR_SPACE_CONV",
> > > > };
> > > > #define V4L2_IOCTLS ARRAY_SIZE(v4l2_ioctls)
> > >
> > > This should go through a control, not an ioctl. Strings control have
> > > recently been introduced, it should be fairly easy to create binary
> > > controls for such cases.
> >
> > I'm not sure whether this should be seen as a control. That feels like an
> > abuse of the control framework to me.
> >
> > Actually, shouldn't this be something for a subdev node? I.e. an omap2/3
> > specific ioctl?
>
> I would see it as a subdev control. Even though this is a complex control that
> uses a matrix instead of a simple integer value, I believe this kind of use
> cases qualify for the control API. They're really controls, i.e. values that
> apply to a block in the video pipeline to tune its behavior.
You have a good point here. It is similar in behavior to e.g. a brightness
control.
Regards,
Hans
>
> > It might be good to refresh our memory of how this is supposed to be used.
>
--
Hans Verkuil - video4linux developer - sponsored by TANDBERG Telecom
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