linux-kernel - Re: [POWER] battery calibration parameters from sysfs

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Message-ID: <20091204141731.GA5668@sirena.org.uk>
Date:	Fri, 4 Dec 2009 14:17:32 +0000
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	Linus Walleij <linus.walleij@...ricsson.com>
Cc:	cbou@....ru, dwmw2@...radead.org,
	LKML <linux-kernel@...r.kernel.org>,
	linux-embedded@...r.kernel.org
Subject: Re: [POWER] battery calibration parameters from sysfs

On Fri, Dec 04, 2009 at 10:49:31AM +0000, Mark Brown wrote:

> Isn't the standard thing here to handle this voltage to capacity mapping
> in userspace if we're just extrapolating from experimental results?
> Even with the "smart" batteries in PCs there are some accuracy concerns
> and obviously the performance of the battery will change over time.

Actually, one further thing here - if this functionality is implemented
in kernel then shouldn't it be a generic feature rather than part of the
driver?  The idea of mapping battery voltages to capacity percentages
isn't specific to a given charger and will apply to all batteries using
the same technology.
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