linux-kernel - Re: [lm-sensors] [PATCH 1/2] hwmon: (applesmc) Allow negative temperature values

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Message-ID: <20120717011051.GA22234@roeck-us.net>
Date:	Mon, 16 Jul 2012 18:10:51 -0700
From:	Guenter Roeck <linux@...ck-us.net>
To:	Henrik Rydberg <rydberg@...omail.se>
Cc:	Guenter Roeck <guenter.roeck@...csson.com>,
	linux-kernel@...r.kernel.org, lm-sensors@...sensors.org
Subject: Re: [lm-sensors] [PATCH 1/2] hwmon: (applesmc) Allow negative
 temperature values

On Mon, Jul 16, 2012 at 09:18:10AM +0200, Henrik Rydberg wrote:
> There are many userland reports of sensors with unreasonably small and
> large temperatures. There seem to be several reasons for this:
> 
> Firstly, the major sensor type (sp78) is actually a signed number.
> This explains why some sensors show very small or large values - they
> are in fact all small, but of different sign.
> 
> Secondly, the other sensor type (1-hex) is not properly understood; it
> may be that it is not a temperature after all.
> 
> Thirdly, some sensors are differential in nature, showing changes over
> time rather than absolute numbers.  This explains why those values are
> small and of varying sign.
> 
> This patch interprets the sp78 type as signed short, but keeps the
> original scaling. For other types, -EINVAL is returned, since the
> nature of those sensors is unknown.
> 
> Signed-off-by: Henrik Rydberg <rydberg@...omail.se>
> ---

Applied to -next.

Thanks,
Guenter
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