On Fri, Aug 21, 2009 at 2:09 AM, Ronny
Brendel<ronny.brendel@xxxxxxxxxxxxx> wrote:
> According to the spec it is """A control which performs an action when set.
> Drivers must ignore the value passed with VIDIOC_S_CTRL and return an EINVAL
> error code on a VIDIOC_G_CTRL attempt."""
>
> I don't get what this means. It is no boolean. It has no effect, and you cannot
> set it? I am probably missing something. Please help.
>
Hi,
This exactly what I wondered several months ago :-)
Recalling the memory back then, the answer was that the button type is
just a command to trigger some functionality which doesn't care about
parameters because that is actually not necessary.
For instance, "adjusting white balance" button in digital camera could
be a good example which is performing adjustment of white balance for
one time and no need for any kind of parameter for this but needs to
be triggered.
Cheers,
Nate
--
=
DongSoo, Nathaniel Kim
Engineer
Mobile S/W Platform Lab.
Digital Media & Communications R&D Centre
Samsung Electronics CO., LTD.
e-mail : dongsoo.kim@xxxxxxxxx
dongsoo45.kim@xxxxxxxxxxx
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