linux-kernel - Re: [PATCH 1/3] backlight: Allow drivers to update the core, and generate events on changes

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Message-ID: <20090729150524.GD1534@ucw.cz>
Date:	Wed, 29 Jul 2009 17:05:24 +0200
From:	Pavel Machek <pavel@....cz>
To:	Matthew Garrett <mjg59@...f.ucam.org>
Cc:	Zhang Rui <rui.zhang@...el.com>,
	Richard Purdie <rpurdie@...ys.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	"lenb@...nel.org" <lenb@...nel.org>,
	"corentincj@...aif.net" <corentincj@...aif.net>
Subject: Re: [PATCH 1/3] backlight: Allow drivers to update the core, and
	generate events on changes


> > > You want smoothing even in a default policy, and doing that well might 
> > > be a bit much for the kernel?
> > > 
> > sorry, I don't understand.
> > do you mean that there should be a default policy in the kernel?
> 
> No, I mean that the only default policy you could reasonably have in the 
> kernel would be tying the backlight directly to the ALS. And that sucks. 
> You need some degree of smoothing, and that's a job better left to 
> userspace.

How would that be done? Wake up userspace 100times a second so it can
read an integer and ardd it to running average?

Is ALS device stupid sensor, or can it do some smoothing/watermarks
itself?
									Pavel

-- 
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