linux-kernel - Re: [lm-sensors] Simple fan question

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Message-ID: <20100517101407.193b93f2@hyperion.delvare>
Date:	Mon, 17 May 2010 10:14:07 +0200
From:	Jean Delvare <khali@...ux-fr.org>
To:	Pavel Machek <pavel@....cz>
Cc:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	lm-sensors@...sensors.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [lm-sensors] Simple fan question

Hi Pavel,

On Mon, 17 May 2010 09:46:21 +0200, Pavel Machek wrote:
> Hi!
> 
> > Right.
> > 
> > Now, maybe the best option is to have instead:
> > 
> > 	fan[1-*]_discrete_value
> > 		Discrete value
> >                 RW
> > 
> > 	fan[1-*]_supported values
> >                 List of supported discrete values
> >                 RO
> 
> Hmm, for 100 different values, that will get ugly. What about simple
> fan_max file with values 0..fan_max being valid?

If you have 100 different values, you can map them to the standard
0..255 range of pwm[1-*] files.

> IIRC thinkpads have 8-or-so possible discrete cases...

Correct. And even these would map nicely to the 0..255 range IMHO.

-- 
Jean Delvare
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