linux-kernel - Re: [lm-sensors] [PATCH] hwmon: Add driver for VIA CPU core temperature

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Date:	Fri, 12 Jun 2009 10:12:00 +0200
From:	Jean Delvare <khali@...ux-fr.org>
To:	Tomaz Mertelj <tomaz.mertelj@...st.arnes.si>,
	Harald Welte <HaraldWelte@...tech.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, lm-sensors@...sensors.org
Subject: Re: [lm-sensors] [PATCH] hwmon: Add driver for VIA CPU core 
 temperature

On Thu, 11 Jun 2009 15:32:55 -0700, Andrew Morton wrote:
> On Wed, 10 Jun 2009 17:40:31 +0000 (UTC)
> Tomaz Mertelj <tomaz.mertelj@...st.arnes.si> wrote:
> 
> > Harald Welte <HaraldWelte <at> viatech.com> writes:
> > 
> > > 
> > > This is a driver for the on-die digital temperature sensor of
> > > VIA's recent CPU models.
> > > 
> > > Signed-off-by: Harald Welte <HaraldWelte <at> viatech.com>
> > > 
> > 
> > Harald,
> 
> You carefully removed Harald from Cc: so he probably didn't read your
> email.
> 
> > I tested it on 2.6.28.3 kernel on VIA VB7002 motherboard and it does not work 
> > correctly.
> > 
> > Output form sensors:
> > 
> > via-cputemp-isa-0000

Harald, dashes in hwmon chip names are _prohibited_. Please change to
via_cputemp or similar.

> > Adapter: ISA adapter
> > Core 0:       +0.0 C
> > 
> > On the other hand 
> > cat '/sys/class/hwmon/hwmon2/device/driver/via-cputemp.0/temp1_input' outputs 
> > numbers between 25-27. 
> > 

Temperature values are supposed to be expressed in millidegrees C, not
degrees C as it seems to be doing (although 25 degrees C seems pretty
low for a CPU temperature?) The drivers needs to multiply values by
1000 before exporting them to sysfs. Then "sensors" will report the
correct temperature value.

-- 
Jean Delvare
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