Hello,

I've got an HP LaserJet 2200d attaching as a generic USB device,
looks like the same problem as this message found in the archives
(for an HP 1200se, IIRC).  ulpt.c (in 1.5.2) is dated 2000/06/01,
apparently this was never fixed.

To summarize the earlier messages in thread, the HP provides 3
interfaces: 1284.4 packetized, bi-directional, and uni-directional.
The ulpt driver doesn't support the first, and the match routine
doesn't continue searching for others.

Would any USB gurus be kind enough to provide a quick patch, or
point me at some more examples (a couple readings through the
ulpt attach routine hasn't clued me yet).

Thanks-

	-Neil


> Subject: Re: HP USB interface confuration error; quirk needed?
> To: Nathan J. Williams <nathanw@MIT.EDU>
> From: Lennart Augustsson <lennart@mail.augustsson.net>
> List: tech-kern
> Date: 06/27/2001 00:46:09 
> 
> Hmm, I think the ulpt match routine needs changing so that it looks
> through the alternate settings.  The attach already does it.
> 
>     -- Lennart
> 
> 
> "Nathan J. Williams" wrote:
> 
> > nathanw@MIT.EDU (Nathan J. Williams) writes:
> >
> > > Second, the configuration descriptor listed "bNumInterface=1", but
> > > then three interface descriptors followed. I think that this is
> > > incorrect on the part of HP, but I'm not 100% sure about the semantics
> > > of this bit of data.
> >
> > Scratch that; I re-read the USB spec, and saw the difference between
> > "Interface Descriptor Number" and "Interface Number".  They're
> > alternate interfaces. I will now go see why we don't seem to deal with
> > those...
> >
> >         - Nathan