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

[Pavel Machek]

On Wed 2009-09-02 23:12:58, Rafael J. Wysocki wrote:
> On Tuesday 01 September 2009, Pavel Machek wrote:
> > 
> > > > > 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.
> 
> Well, "-1" is a perfectly valid alphanumerical representation of an int.
> I don't really see the problem with the "-", unless we're talking about some
> broken user space, that is.

No. But if you see illumination value of -1 lumen, do you really
expect a *lot* of light?
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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