On Mon, Oct 01, 2007 at 11:05:38AM -0400, Ben Warren wrote: > Hello, > > > 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. For the video-for-linux interface, yes, unfortunatly they are still the preferred way due to a lot of legacy issues that are involved :( But for anything else, you are correct, use sysfs whenever possible for simple things, and only use an ioctl for more complex transaction-like things. Although for some transaction-like things, configfs works quite well, you might want to look into that. hope this helps, greg k-h
