Querying USB device's bInterfaceNumber

[Greg KH]

On Tue, Nov 03, 2009 at 01:13:16PM -0500, Adam Jackson wrote:
> On Tue, 2009-11-03 at 10:03 -0800, Ping wrote:
> > I need a quick answer since searching through the X server code takes
> > too long.  
> > 
> > Is there a way for me to get the bInterfaceNumber from a device HID
> > Descriptor inside an xorg Input device driver?  I feel there should be
> > an existing mechanism to fulfil this, maybe through an ioctl call?
> > Can someone show me what parameter(s) I need to use if the ioctl is
> > supported?
> > 
> > Please also reply to me if you know there is no existing way to get
> > the bInterfaceNumber inside an xorg device driver so I will add my own
> > workaround in the kernel driver.
> 
> X doesn't have any particular knowledge of USB internally, you'll need
> to roll your own.

As X has knowledge of PCI internally, perhaps we should add some basic
USB support as well to prevent people from having to add odd hacks to
kernel drivers for stuff like this?

thanks,

greg k-h