Re: Writing a driver for a legacy serial device

From: Jean Delvare <khali@linux-fr.org>
To: David Woodhouse <dwmw2@infradead.org>
Cc: Dmitry Torokhov <dtor@insightbb.com>,
	LKML <linux-kernel@vger.kernel.org>,
	Vojtech Pavlik <vojtech@ucw.cz>
Subject: Re: Writing a driver for a legacy serial device
Date: Thu, 21 Jun 2007 20:38:43 +0200	[thread overview]
Message-ID: <20070621203843.044fd19a@hyperion.delvare> (raw)
In-Reply-To: <1182437233.2782.36.camel@shinybook.infradead.org>

Hi David,

On Thu, 21 Jun 2007 22:47:12 +0800, David Woodhouse wrote:
> On Thu, 2007-06-21 at 11:33 +0200, Jean Delvare wrote:
> > OK. This leads me to a question: is it OK for me to add support for my
> > non-input device to inputattach, or is a separate, dedicated helper
> > tool preferred? Both ways are fine with me, I don't know what the
> > input subsystem maintainers expect.
> 
> You might do better to implement it as a line discipline instead. 
> Or just do it in userspace. What exactly are you trying to do?

I am writing a driver for a TAOS evaluation module. This device is a
limited SMBus master, connecting to the serial port. The evaluation
chip is connected to the SMBus. In my case this is a TSL2550 light
sensor, but virtually all compatible TAOS evaluation modules could be
supported.

I2C bus drivers have to be implemented in the kernel, so user-space
isn't an option for me.

I just posted a first (working) version of my driver, if you want to
take a look:
http://lists.lm-sensors.org/pipermail/i2c/2007-June/001508.html

Thanks,
-- 
Jean Delvare