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Date: Thu, 27 Mar 2003 14:31:40 +0100
From: Jean Delvare <khali@linux-fr.org>
To: Jan Dittmer <j.dittmer@portrix.net>
Cc: azarah@gentoo.org, greg@kroah.com, mds@paradyne.com,
       linux-kernel@vger.kernel.org, linux@brodo.de,
       sensors@Stimpy.netroedge.com
Subject: Re: lm sensors sysfs file structure
Message-Id: <20030327143140.0428fcd7.khali@linux-fr.org>
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> Ah, and I don't want to do small corrections like 1 or 2 percent up or
> or down, but things like this for lm80:
>      compute in0 (24/14.7 + 1) * @ ,       @ / (24/14.7 + 1)
>      compute in2 (22.1/30 + 1) * @ ,       @ / (22.1/30 + 1)
>      compute in3 (2.8/1.9) * @,            @ * 1.9/2.8
>      compute in4 (160/30.1 + 1) * @,       @ / (160/30.1 + 1)
> 
> These differ a lot. And as stated in the sensors.conf seem to be from 
> the datasheet of the lm80 and not mainboard specific.

They may be mainboard specific. The formulae rely on *suggested*
resistor values, which the integrators may or may not follow. There
definitely is a need for userspace conversion. Libsensors needs to be
tunable by the user.

I don't know about the kernel conversion Jan is talking about (never
coded a sensor driver myself), so I can't talk about this half, but I'm
pretty sure you shouldn't even think of moving all conversions into
kernel space.

Mark, Phil, maybe you could explain the reasons better than I would?

-- 
Jean Delvare
http://www.ensicaen.ismra.fr/~delvare/
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