linux-kernel - Re: [RFC PATCH V2 1/2] introduce ALS sysfs class

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Date:	Thu, 6 Aug 2009 11:53:22 -0700
From:	Greg KH <greg@...ah.com>
To:	Zhang Rui <rui.zhang@...el.com>
Cc:	linux-acpi <linux-acpi@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Pavel Machek <pavel@....cz>, Len Brown <lenb@...nel.org>,
	Richard Purdie <rpurdie@...ys.net>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	Bjorn Helgaas <bjorn.helgaas@...com>,
	"Valdis.Kletnieks@...edu" <Valdis.Kletnieks@...edu>
Subject: Re: [RFC PATCH V2 1/2] introduce ALS sysfs class

On Thu, Aug 06, 2009 at 04:31:38PM +0800, Zhang Rui wrote:
> 
> Introduce ALS sysfs class device.
> 
> ALS sysfs class device provides a standard sysfs interface
> for Ambient Light Sensor devices.
> 
> Only two sysfs I/F are introduced currently.
> /sys/class/als/alsX/illuminance:
> 	indicates the amount of light incident upon a specified surface area.
> /sys/class/als/alsX/mappings:
> 	exports ambient light illuminance to display luminance mappings
> 	that can be used by an OS to calibrate its ambient light policy
> 	for a given sensor configuration.
> 	The OS can use this information to extrapolate an ALS response curve
> 	- noting that these values may be treated differently depending on the
> 	OS implementation but should be used in some form to calibrate ALS policy.
> 
> Signed-off-by: Zhang Rui <rui.zhang@...el.com>
> ---
>  Documentation/als/sysfs.txt |  138 ++++++++++++++++++++++

This needs to be in Documentation/ABI instead.

thanks,

greg k-h
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