On Tuesday, February 22, 2011 17:39:25 Guennadi Liakhovetski wrote:
> On Tue, 22 Feb 2011, Hans Verkuil wrote:
>
> > > Hi
> > >
> > > Any thoughts about the subj? Hasn't anyone run into a need to select
> > > inputs on subdevices until now? Something like
> > >
> > > struct v4l2_subdev_video_ops {
> > > ...
> > > int (*enum_input)(struct v4l2_subdev *sd, struct v4l2_input *inp);
> > > int (*g_input)(struct v4l2_subdev *sd, unsigned int *i);
> > > int (*s_input)(struct v4l2_subdev *sd, unsigned int i);
> >
> > That's done through s_routing. Subdevices know nothing about inputs as
> > shown to userspace.
> >
> > If you want a test pattern, then the host driver needs to add a "Test
> > Pattern" input and call s_routing with the correct values (specific to
> > that subdev) to set it up.
>
> Hm, maybe I misunderstood something, but if we understand "host" in the
> same way, then this doesn't seem very useful to me. What shall the host
> have to do with various sensor inputs? It cannot know, whether the sensor
> has a test-pattern "input" and if yes - how many of them. Many sensors
> have several such patterns, and, I think, some of them also have some
> parameters, like colour values, etc., which we don't have anything to map
> to. But even without that - some sensors have several test patterns, which
> they well might want to be able to switch between by presenting not just
> one but several test inputs. So, shouldn't we have some enum_routing or
> something for them?
What you really want is to select a test pattern. A good solution would be
to create a sensor menu control with all the test patterns it supports.
Regards,
Hans
>
> Feel free to re-add the ML to CC.
>
> Thanks
> Guennadi
>
> > The saa7127 subdev does something like this (see include/media/saa7127.h).
> > The ivtv host driver only selects this during firmware load, though. It's
> > not mapped to a user input.
> >
> > Regards,
> >
> > Hans
> >
> > >
> > > For example, we discussed implementing sensor test patterns as separate
> > > inputs.
> > >
> > > Thanks
> > > Guennadi
> > > ---
> > > Guennadi Liakhovetski, Ph.D.
> > > Freelance Open-Source Software Developer
> > > http://www.open-technology.de/
> > > --
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> > >
> >
> >
>
> ---
> Guennadi Liakhovetski, Ph.D.
> Freelance Open-Source Software Developer
> http://www.open-technology.de/
>
--
Hans Verkuil - video4linux developer - sponsored by Cisco
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