linux-kernel.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: Steve Underwood <steveu@coppice.org>
To: Tim Waugh <twaugh@redhat.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: USB IEEE1284 gadgets and ppdev
Date: Tue, 01 Oct 2002 23:35:53 +0800	[thread overview]
Message-ID: <3D99C0D9.7060704@coppice.org> (raw)
In-Reply-To: <20020925150915.GM9457@redhat.com>

Tim Waugh wrote:

>On Wed, Sep 25, 2002 at 08:01:29AM -0700, Greg KH wrote:
>
>  
>
>>I understand that the uss720 driver should register with parport, as
>>it is a USB to parallel port adapter, but the usblp driver should
>>not, as it is just a pass-through to a printer.  Do you see any
>>advantage to having usblp registering with parport?
>>    
>>
>
>Well, it would mean that ppdev could use it.  I understand that only a
>few functions of a normal parallel port could be implemented (read,
>write, get status).
>
>Alternatively I suppose I could get libieee1284 to grok /dev/usb/lp*.
>Steve---would that solve the problem that you're running into?
>
>Tim.
>*/
>  
>
Well, the application is this. A lot of industrial control, embedded 
processor development interfaces, and other stuff use a parallel port to 
connect to a PC. The parallel port has gone from some notebooks, and is 
soon to go from desktops too. I want to access some of those devices 
through a USB to IEEE1284 cable. If the programming interface is ppdev, 
that is great - no changes needed for code that already works with a 
real parallel port. If it requires a somewhat different API, that's no 
big deal. Being able to bit twiddle to the extent that ppdev allows is 
pretty important, though. I guess there may be some latency issues 
slowing the bit twiddling across a USB interface, but nothing's perfect.

Regards,
Steve



  reply	other threads:[~2002-10-01 15:30 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2002-09-24 15:22 Steve Underwood
2002-09-24 16:21 ` Tim Waugh
2002-09-25 13:51   ` Steve Underwood
2002-09-25 14:27     ` Tim Waugh
2002-09-25 15:01       ` Greg KH
2002-09-25 15:09         ` Tim Waugh
2002-10-01 15:35           ` Steve Underwood [this message]
2002-10-01 16:23             ` Tim Waugh

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=3D99C0D9.7060704@coppice.org \
    --to=steveu@coppice.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=twaugh@redhat.com \
    --subject='Re: USB IEEE1284 gadgets and ppdev' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).