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

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Message-ID: <4B26FC52.6060307@billgatliff.com>
Date:	Mon, 14 Dec 2009 21:02:42 -0600
From:	Bill Gatliff <bgat@...lgatliff.com>
To:	Aras Vaichas <arasv@...ellan-technology.com>
CC:	Pavel Machek <pavel@....cz>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	Linus Walleij <linus.walleij@...ricsson.com>, cbou@...l.ru,
	dwmw2@...radead.org, LKML <linux-kernel@...r.kernel.org>,
	linux-embedded@...r.kernel.org,
	Brian Swetland <swetland@...gle.com>, rpurdie@...ys.net,
	lenz@...wisc.edu, Dirk@...er-online.de, arminlitzel@....de,
	Cyril Hrubis <metan@....cz>, thommycheck@...il.com,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
	dbaryshkov@...il.com, omegamoon@...il.com, eric.y.miao@...il.com,
	utx@...guin.cz, zaurus-devel@...ts.linuxtogo.org
Subject: Re: [POWER] battery calibration parameters from sysfs

Aras Vaichas wrote:
> Unfortunately the simple coulomb counting chips have the disadvantage
> that the CPU has to be running to accumulate the pulses. Of course,
> the pulses could wake the CPU from a suspend mode, but I'd rather not
> do that just to add "one" to a counter ...
>   

Could you have the coulomb-counting chip connected to a tiny
microcontroller, or even a dedicated hardware counter?  Then the main
CPU wouldn't need to wake as often, it could just ask the
microcontroller over I2C, or read/reset the hardware counter.


b.g.

-- 
Bill Gatliff
bgat@...lgatliff.com

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