linux-kernel - Re: [PATCH] bq27x00_battery: Fix reporting battery temperature

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Message-ID: <20130203200557.GA15430@lizard.gateway.2wire.net>
Date:	Sun, 3 Feb 2013 12:05:57 -0800
From:	Anton Vorontsov <anton@...msg.org>
To:	Pali Rohár <pali.rohar@...il.com>
Cc:	David Woodhouse <dwmw2@...radead.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] bq27x00_battery: Fix reporting battery temperature

On Sun, Feb 03, 2013 at 09:01:54PM +0100, Pali Rohár wrote:
> On Sunday 03 February 2013 04:44:51 Anton Vorontsov wrote:
> > On Sat, Feb 02, 2013 at 11:06:09AM +0100, Pali Rohár wrote:
> > > Reported temperature can be also negative, so cache value in
> > > non negative Kelvin degree.
> > > 
> > > Signed-off-by: Pali Rohár <pali.rohar@...il.com>
> > > ---
> > 
> > Applied, thanks!
> 
> Now I looked at bq27x00_battery and rx51_battery drivers and I 
> see that both drivers reporting temperature in different units. 
> bq27x00_battery in 1/10 °C and rx51_battery in 1/100 °C. What is 
> correct degree for kernel power power supply API? Maybe other 
> kernel drivers have different units too... Note that my above 
> patch did not changed anything units, only fixed reporting 
> (possible) negative temperature.

Per Documentation/power/power_supply_class.txt and power_supply.h:

/*
 * All voltages, currents, charges, energies, time and temperatures in uV,
 * µA, µAh, µWh, seconds and tenths of degree Celsius unless otherwise
 * stated. It's driver's job to convert its raw values to units in which
 * this class operates.
 */

Feel free to fix the offending drivers.

Thanks,

Anton
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