linux-kernel - Re: [PATCH 0/3] Generic sysfs support for ACPI ALS and other ALS devices

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Message-ID: <20090804132129.GH18974@elf.ucw.cz>
Date:	Tue, 4 Aug 2009 15:21:29 +0200
From:	Pavel Machek <pavel@....cz>
To:	Zhang Rui <rui.zhang@...el.com>
Cc:	linux-acpi <linux-acpi@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Len Brown <lenb@...nel.org>,
	Richard Purdie <rpurdie@...ys.net>,
	Matthew Garrett <mjg59@...f.ucam.org>, Greg KH <greg@...ah.com>
Subject: Re: [PATCH 0/3] Generic sysfs support for ACPI ALS and other ALS
	devices

On Mon 2009-08-03 17:10:57, Zhang Rui wrote:
> Hi, all,
> 
> This is the patch set I made to introduce ACPI ALS device driver
> and a generic sysfs I/F for all the ALS devices, like ACPI ALS,
> platform ALS, etc.
> 
> Patch 01 introduces the ACPI ALS device driver.
> 
> Patch 02 introduces ALS sysfs class.
> 	Two sysfs I/F are created for each ALS device.
>   /sys/class/als/alsX/illuminance:
> 	the amount of light incident upon a specified surface area.
>   /sys/class/als/alsX/mappings:
> 	ambient light illuminance to display luminance mappings
> 	that can be used by an OS to calibrate its ambient light policy
> 	this is what I got on a test box:
> 	cat /sys/class/als/als0/mappings
> 	???Illuminance	Adjustment
> 	          0	       70
> 	         10	       73
> 	         80	       85
> 	        300	      100
> 	       1000	      150

There's one value per file for sysfs... You should definitely have the
header. 

Is there chance to already return adjusted values, avoiding this
uglyness?

Plus I'd say Documentation/ file is needed.

									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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