linux-kernel - Re: [PATCH] Add the ability to layer another driver over the serial driver

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Message-ID: <457D8E35.9050706@imap.cc>
Date:	Mon, 11 Dec 2006 17:58:29 +0100
From:	Tilman Schmidt <tilman@...p.cc>
To:	Alan <alan@...rguk.ukuu.org.uk>
CC:	Corey Minyard <cminyard@...sta.com>,
	Guennadi Liakhovetski <g.liakhovetski@....de>,
	linux-serial@...r.kernel.org,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Hansjoerg Lipp <hjlipp@....de>, Russell Doty <rdoty@...hat.com>
Subject: Re: [PATCH] Add the ability to layer another driver over the serial
 driver

On Mon, 11 Dec 2006 10:20:16 +0000, Alan wrote:
> This looks wrong. You already have a kernel interface to serial drivers.
> It is called a line discipline. We use it for ppp, we use it for slip, we
> use it for a few other things such as attaching sync drivers to some
> devices.

I was under the impression that line disciplines need a user space
process to open the serial device and push them onto it. Is there
a way for a driver to attach to a serial port through the line
discipline interface from kernel space, eg. from an initialization,
module load, or probe function?

-- 
Tilman Schmidt                    E-Mail: tilman@...p.cc
Bonn, Germany
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