From owner-freebsd-hackers  Mon Aug 26  8:29:15 2002
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Date: Mon, 26 Aug 2002 08:29:12 -0700 (PDT)
From: =?ISO-8859-1?Q?Mikko_Ty=F6l=E4j=E4rvi?= <mikko@dynas.se>
Subject: Re: USB support for new HP printers?
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To: Terry Lambert <tlambert2@mindspring.com>
Cc: John Nielsen <john@jnielsen.net>, Marco Molteni <molter@tin.it>,
	freebsd-hackers@freebsd.org
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On Mon, 26 Aug 2002, Terry Lambert wrote:

> John Nielsen wrote:
> > > have a look at hpoj.sourceforge.net
> > > they plan FreeBSD USB support for a next release
> >
> > I've been all over the site and read some of the docs.  The most useful
> > piece of information I found was this:
> >
> > "FreeBSD, NetBSD, and OpenBSD are not yet supported in USB mode, due to
> > missing functionality in the kernel "ulpt" driver (bidirectional I/O,
> > device ID retrieval, switching to 7/1/3, and HP channel-change-request)."
>
>
> I'm pretty sure that bidirectional I/O is supported, or there
> would be no network devices.

[...]

Though the USB stack handles bi-directional communication, ulpt does not:

Static struct cdevsw ulpt_cdevsw = {
       /* open */    ulptopen,
       /* close */   ulptclose,
       /* read */    noread,		<---- !
...

In -current, an input routine has been added, but all it does is
discard any data that comes from the printer.

  $.02,
  /Mikko

 Mikko Työläjärvi_______________________________________mikko@rsasecurity.com
 RSA Security


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