linux-kernel - Re: [patch] spitz: better voltage-to-percentage conversion

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Message-ID: <4B0F88C4.9010206@gmail.com>
Date:	Fri, 27 Nov 2009 09:07:32 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Pavel Machek <pavel@....cz>
CC:	rpurdie@...ys.net, lenz@...wisc.edu,
	kernel list <linux-kernel@...r.kernel.org>,
	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
Subject: Re: [patch] spitz: better voltage-to-percentage conversion

Pavel Machek a écrit :
> Old code has two huge tables... unfortunately those tables are simple
> linear relationships and wrong: li-ions do not behave like that.
> 
> Convert physical values to mV,mA,mOhm, add computation that makes
> sense for physical point of view, and provide tables based on
> measurements.
> 
> To get even better results, we should provide better battery_current
> estimate (taking backlight into account), and adjust adjust
> battery_resistance according to its age and temperature. 
> 
> Signed-off-by: Pavel Machek <pavel@....cz>
> 
> 
> --- a/arch/arm/mach-pxa/corgi_pm.c	2009-11-23 20:48:26.000000000 +0100

> +typedef int miliamp_t;
> +typedef int miliohm_t;
> +typedef int milivolt_t;

milliamp, milliohm, millivolt ?

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