linux-kernel - Re: [PATCH 3/7] [RFC] Battery monitoring class

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Message-ID: <20070412141505.GA25552@zarina>
Date:	Thu, 12 Apr 2007 18:15:05 +0400
From:	Anton Vorontsov <cbou@...l.ru>
To:	Matthew Garrett <mjg59@...f.ucam.org>
Cc:	linux-kernel@...r.kernel.org, kernel-discuss@...dhelds.org,
	dwmw2@...radead.org
Subject: Re: [PATCH 3/7] [RFC] Battery monitoring class

On Thu, Apr 12, 2007 at 02:08:18PM +0100, Matthew Garrett wrote:
> On Thu, Apr 12, 2007 at 03:25:03AM +0400, Anton Vorontsov wrote:
> > + * All voltages, currents, capacities and temperatures in mV, mA, mAh and
> > + * tenths of a degree unless otherwise stated. It's driver's job to convert
> > + * its raw values to which this class operates. If for some reason driver
> > + * can't afford this requirement, then it have to create its own attributes,
> > + * plus additional "XYZ_units" for each of them.
> 
> ACPI batteries can report capacity and rate in either mA or mW. Given

You sure, capacity in mA? Then I don't know. But you can safely
fallback and create your own attribute (just as in David's battery class,
where every battery required to create its own attributes), plus create
capacity_units attribute. So, user space will know your driver's specific
units.

> the lack of a constant voltage, how do you accurately convert between 
> the two? Right now, I think this is a loss of functionality over the 
> current situation.


> 
> -- 
> Matthew Garrett | mjg59@...f.ucam.org

-- 
Anton Vorontsov
email: cbou@...l.ru
backup email: ya-cbou@...dex.ru
irc://irc.freenode.org/bd2
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