Re: 'Phys:' field for keyboards (and other input devices)

[Vojtech P. <vo...@su...>]

On Tue, Oct 08, 2002 at 10:17:24AM +1000, Brad Hards wrote:
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> On Mon, 7 Oct 2002 18:07, Vojtech Pavlik wrote:
> > On Fri, Sep 27, 2002 at 09:34:31PM +1000, Brad Hards wrote:
> > > And it is broken, at least on USB. We're reporting the same on both
> > > EVIOCGPHYS and EVIOGUNIQ - the path.
> >
> > Hmm, It doesn't seem so to me:
> <snip>
> You were right, of course. I cut'n'pasted my test code, and forgot to change 
> the ioctl from EVIOCGPHYS to EVIOCGUNIQ. I feel quite embarressed :-(
> 
> > Others usually don't set UNIQ and only set PHYS as they don't have an
> > unique identifier.
> So a NULL string means "I don't have a unique identifier"?

Yes.

> I can't actually find a HID device that has a serial number. Maybe I need to 
> make one...

That would work. I think some Wacoms might have serial numbers, at least
their tools (in the wacom protocol, not USB) do.

-- 
Vojtech Pavlik
SuSE Labs