linux-kernel - Re: [PATCH v2] Re: Battery class driver.

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Date:	Tue, 31 Oct 2006 16:06:34 +0200
From:	"Shem Multinymous" <multinymous@...il.com>
To:	"Xavier Bestel" <xavier.bestel@...e.fr>
Cc:	"Jean Delvare" <khali@...ux-fr.org>, davidz@...hat.com,
	"Richard Hughes" <hughsient@...il.com>,
	"David Woodhouse" <dwmw2@...radead.org>,
	"Dan Williams" <dcbw@...hat.com>, linux-kernel@...r.kernel.org,
	devel@...top.org, sfr@...b.auug.org.au, len.brown@...el.com,
	greg@...ah.com, benh@...nel.crashing.org,
	"linux-thinkpad mailing list" <linux-thinkpad@...ux-thinkpad.org>,
	"Pavel Machek" <pavel@...e.cz>
Subject: Re: [PATCH v2] Re: Battery class driver.

On 10/31/06, Xavier Bestel <xavier.bestel@...e.fr> wrote:
> > Well, we have to do *something* about those devices that don't have
> > fixed units (see my mail to Greg from a few minutes ago), so which
> > alternative do you prefer?
>
> How about converting on the fly ?

In the case at hand we have mWh and mAh, which measure different
physical quantities. You can't convert between them unless you have
intimate knowledge of the battery's chemistry and condition, which we
don't.

And it would be nice to also allow for power supply devices that use
other, incompatible units like "percent" or "minutes" or "hand crank
revolutions".

  Shem
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