linux-kernel - Re: [GIT PULL] Ambient Light Sensors subsystem

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Message-ID: <20100310204626.GB1394@ucw.cz>
Date:	Wed, 10 Mar 2010 21:46:27 +0100
From:	Pavel Machek <pavel@....cz>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Dima Zavin <dmitriyz@...gle.com>,
	Jonathan Cameron <jic23@....ac.uk>,
	LKML <linux-kernel@...r.kernel.org>,
	Zhang Rui <rui.zhang@...el.com>,
	Amit Kucheria <amit.kucheria@...durent.com>,
	Jean Delvare <khali@...ux-fr.org>
Subject: Re: [GIT PULL] Ambient Light Sensors subsystem

Hi!

> > > Because in general ambient light sensor may have nothing to do with the
> > > screen brightness. The fact that all current uses are tied to
> > > controlling screen brightness is coincidential. You could use it as well
> > > to turn on the lights in the kitchen if it is getting too dark...
> > 
> > But my point is, it acts pretty much like a key on a keyboard 
> > _regardless_. 
> > 
> > Sure, you migth use it to turn up the lights too. But how is that 
> > different from having a switch to do the same? Again, it doesn't sound 
> > that different from a key to me.
> 
> I guess for me the distinction is that the event was not caused by an
> action of a human being but by change in environment.

Well, I seen people covering light sensor by hand to change screen
brightness :-).

> Also, if we decide that input layer is the best place for such devices,
> it should not be a key but absolute event, ABS_LIGHT_LEVEL or something.

Yep.

> > I agree that that's not true in many other situations. A cable insertion 
> > event is about the networking, not about some independent input. The kind 
> > of application that cares about network cable presense is _not_ the kind 
> > of app that would care about keyboard input. Same goes for voltage.
> 
> What about magnetometers, accelerometers and so forth? I still do not
> think they are pure input layer devices although it is possible to build
> a bridge modules so they could plug into input framework if desired.

At least on android, accelerometers are primarily human interaction
device -- for screen rotation. And biggest use of
magnetometer+accelerometer on android is actually looking around in
streetview...

									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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