Thank you Mauro.
I finally got it what to do.
I'll figure it out how to make it easier to control strobe lights through CIDs.
"Try to avoid creating newer ioctls" is the same I think.
Cheers,
Nate
On Fri, Jan 9, 2009 at 1:18 PM, Mauro Carvalho Chehab
<mchehab@xxxxxxxxxxxxx> wrote:
> On Fri, 9 Jan 2009 12:20:16 +0900
> "DongSoo Kim" <dongsoo.kim@xxxxxxxxx> wrote:
>
>> Hello everyone.
>>
>> I'm facing with some questions about "Can I make it ioctl or CID?"
>
> For most cases, creating a control (CID) is better than using another ioctl.
>
>> Because if I make it in ioctl It should occupy one of the extra ioctl
>> number for v4l2, and I'm afraid it deserves that.
>>
>> Actually I'm working on strobe flash device (like xenon flash, LED
>> flash and so on...) for digital camera.
>>
>> And in my opinion it looks good in v4l2 than in misc device. (or..is
>> there some subsystems for strobe light? sorry I can't find it yet)
>
> As far as I understand, having this on V4L2 would be better.
>
>> As far as I worked on, strobe light seems to be more easy to control
>> over ioctl than CID. Since we need to check its status (like not
>> charged, turned off etc..).
>
> v4l2 controls can be used also to read. You may even group several different
> controls into one get or set request.
>
>> But here is the thing.
>>
>> "Is that really worthy of occupying an ioctl number for v4l2?"
>>
>> Can I use extra ioctl numbers as many as I like for v4l2 if It is reasonable?
>>
>> Can I have a rule if there is a rule for that?
>
> There's no rule, but we generally try to avoid creating newer ioctls. It is not
> forbidden to create, but we need to take some care with.
>
> Cheers,
> Mauro
>
--
========================================================
Dong Soo, Kim
Engineer
Mobile S/W Platform Lab. S/W centre
Telecommunication R&D Centre
Samsung Electronics CO., LTD.
e-mail : dongsoo.kim@xxxxxxxxx
dongsoo45.kim@xxxxxxxxxxx
========================================================
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