From mboxrd@z Thu Jan  1 00:00:00 1970
From: Alan <alan@lxorguk.ukuu.org.uk>
Subject: Re: [PATCH] Add the ability to layer another driver over the serial
 driver
Date: Mon, 11 Dec 2006 19:15:43 +0000
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To: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Cc: Corey Minyard <cminyard@mvista.com>, Tilman Schmidt <tilman@imap.cc>, linux-serial@vger.kernel.org, Linux Kernel <linux-kernel@vger.kernel.org>, Hansjoerg Lipp <hjlipp@web.de>, Russell Doty <rdoty@redhat.com>
List-Id: linux-serial@vger.kernel.org

> there as "protocols" for user-tty interfaces, i.e., you need a user, that 
> opens a tty, sets a line discipline to it, and does io (read/write) over 
> it, and NOT to be completely initialised and driven from the kernel.

Take a look at the SLIP driver. User space sets up the port but all the
actual I/O is to/from the kernel not via user space.