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
next prev parent 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 USB IEEE1284 gadgets and ppdev 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
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