Querying USB device's bInterfaceNumber

Adam Jackson ajax at nwnk.net
Tue Nov 3 10:13:16 PST 2009

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.

- ajax
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