Date: Sun, 8 May 2005 13:12:16 +0200
From: Willy Tarreau <willy@w.ods.org>
To: moreau francis <francis_moreau2000@yahoo.fr>
Cc: linux-kernel@vger.kernel.org
Subject: Re: advices for a lcd driver design.
Message-ID: <20050508111216.GB18600@alpha.home.local>
References: <20050508103330.93937.qmail@web25105.mail.ukl.yahoo.com>
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Hi Francis,

There already are several drivers for this display, why write another one ?
One I use and know (because I wrote it :-)) is available here :
 
  http://linux.exosec.net/kernel/lcdpanel/

It works with any combination of data and control bits from a parallel port,
and can initialize early in the kernel to display a booting message. It also
supports a keypad. I know that several appliance makers who use it. It uses
/dev/lcd to send data and some ANSI codes to move the cursor, and to define
up to 8 graphics characters. It uses /dev/keypad for keypad input.

Another one exists, I don't remember its name but it used to be announced
on freshmeat. It emulates a vt52 terminal IIRC.

Hoping this helps,
Willy

On Sun, May 08, 2005 at 12:33:30PM +0200, moreau francis wrote:
> Hi,
> 
> I'm trying to write a lcd driver for a HD44780 compatible display.
> Basicaly it will be the only screen available on my linux board.
> My problem is that I don't know which desgin I should use when
> implementing the lcd's driver, because several choices are possible:
> 
> 1) implementing a dumb char device  "/dev/lcd"
> 2) implementing a console driver
> 3) implementing a tty driver
> 
> I can't find any documentation on vt that makes the choice quite
> hard but when looking at the code it may be the best choice for
> user-space. Do you think it's the good direction ?
> 
> Thanks for your advices,
> 
>       Francis.
> 
> 
> 	
> 
> 	
> 		
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