State of Linux webcam support

Ben Warren biggerbadderben at
Mon Oct 1 15:05:38 UTC 2007


> I've got a UVC webcam (logitech sphere) over here let me know if I can help
> with testing. Also talking about the logitech sphere, it has the ability to
> turn left/right and up/down, currently it uses custom IOCTL's for this and so
> do some other drivers which can drive camera's with the same feature, I believe
> we need to add some standard ioctl's for this (including one to query for this
> capability), so that userspace apps can use this feature without having to
> write support for it for each driver seperately.
> Hi,

A bit OT, and I apologize.  Are ioctls still the preferred way to pass
complex data between the kernel and user space?  In my embedded work I
try to use sysfs wherever possible, but for more complicated
transactions still use ioctls because the single-parameter nature of
sysfs can be limiting.

This just came to mind when Hans mentioned defining a standard
interface.  Please don't misread this as a suggestion.  I'm just
trying to get a feel for how people are doing things these days.


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