linux-kernel - Re: [PATCH V6 1/2] introduce ALS sysfs class

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Date:	Tue, 1 Sep 2009 15:41:44 +0200
From:	Pavel Machek <pavel@....cz>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Zhang Rui <rui.zhang@...el.com>, Len Brown <lenb@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-acpi <linux-acpi@...r.kernel.org>, Greg KH <greg@...ah.com>
Subject: Re: [PATCH V6 1/2] introduce ALS sysfs class


> > > IMO, 0 and -1 are not errors. they just suggest that the Ambient Light
> > > illuminance is beyond the device support range, while the device is
> > > still working normally.
> > > what about exporting these values (0 and -1) to user space directly?
> > 
> > Returning 0 for "below" range and 99999999 for "above" range would be
> > nice, yes. 
> 
> Why not 0 and "all ones" or 0 and -1.
> 
> Is there anything wrong with -1 in particular?

Normal people expect -1 to be less than 123, and output is in ascii. If
you make it ((unsigned) ~0) I guess that becomes acceptable.
								Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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