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

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Message-ID: <20090804173627.GA23848@kroah.com>
Date:	Tue, 4 Aug 2009 10:36:27 -0700
From:	Greg KH <greg@...ah.com>
To:	Valdis.Kletnieks@...edu
Cc:	Pavel Machek <pavel@....cz>, 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 01:24:24PM -0400, Valdis.Kletnieks@...edu wrote:
> On Tue, 04 Aug 2009 08:10:42 PDT, Greg KH said:
> > On Tue, Aug 04, 2009 at 03:21:29PM +0200, Pavel Machek wrote:
> > > On Mon 2009-08-03 17:10:57, Zhang Rui wrote:
> 
> > > > 	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.
> 
> What's the intended sysfs solution here, then? Make 'mappings' a directory,
> and populate it with files called 0, 10, 80, 300, 1000, each with one number
> in them?

That's one acceptable solution.  Or how about files in this directory
called "mapping_0", "mapping_10", and so on, containing the adjustment
value?

thanks,

greg k-h
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