Re: Figuring out USB device locations

From: Greg KH
Date: Thu Mar 25 2004 - 19:57:03 EST

On Thu, Mar 25, 2004 at 04:33:06PM -0800, James Lamanna wrote:
> Greg KH wrote:
> >On Thu, Mar 25, 2004 at 09:20:47AM -0800, James Lamanna wrote:
> >
> >>Is there an easy way to find out what /dev entries usb devices get
> >>mapped to from userspace?
> >
> >
> >"easy way" on 2.4? No, sorry. You need 2.6 to determine this in a
> >simple manner. But there are some files in the /proc/bus/usb/
> >and /proc/bus/input/ directories that will help you out.
> Hmm...its not obvious to me how i can use /proc/bus/usb/xxx/yyy to get
> the /dev entry information. I can get the USB device number, but I don't
> see how to get at a mapping to a major/minor in /dev space (or is this
> not possible in 2.4)...

Well, for mice you can corrispond the usb position found in
/proc/bus/usb/devices with the input information found in
/proc/bus/usb/input to determine which /dev file that mouse is
(possibly, but you might get a close guess there.)

But remember, under 2.4 this is quite difficult. I suggest just giving
up and using 2.6 :)


greg k-h
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