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

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Date:	Tue, 4 Aug 2009 08:10:42 -0700
From:	Greg KH <greg@...ah.com>
To:	Pavel Machek <pavel@....cz>
Cc:	Zhang Rui <rui.zhang@...el.com>,
	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>
Subject: Re: [PATCH 0/3] Generic sysfs support for ACPI ALS and other ALS
 devices

On Tue, Aug 04, 2009 at 03:21:29PM +0200, Pavel Machek wrote:
> 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. 

No, no "header", just don't do this, it's not allowed. Again,
one-value-per-sysfs-file is the rule, please do not violate it.

> Plus I'd say Documentation/ file is needed.

It's required for any new sysfs file being added to the kernel.

thanks,

greg k-h
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