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

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Message-ID: <20070415004354.GA23559@zarina>
Date:	Sun, 15 Apr 2007 04:43:54 +0400
From:	Anton Vorontsov <cbou@...l.ru>
To:	linux-kernel@...r.kernel.org
Cc:	kernel-discuss@...dhelds.org, dwmw2@...radead.org,
	Greg KH <greg@...ah.com>,
	Randy Dunlap <randy.dunlap@...cle.com>,
	Shem Multinymous <multinymous@...il.com>,
	Henrique de Moraes Holschuh <hmh@....eng.br>,
	Matthew Garrett <mjg59@...f.ucam.org>
Subject: Re: [PATCH 3/7] [RFC] Battery monitoring class

On Fri, Apr 13, 2007 at 05:49:39PM +0400, Anton Vorontsov wrote:
> I'll convert mXh to uXh a bit later, if there will no further objections
> against uXh. Also I'd like to hear if there any objections on
> mA/mV -> uA/uV conversion. I think we'd better keep all units at the
> same order/precision.

Okay, would it make sense to use "long" instead of "int" after "milli" to
"micro" conversion? On 32 bit machines int gives +-2147483648 limit. So
2147 volts/amperes/...

Though 2147 amperes is unrealistic for batteries, but if used in
calculations it could be dangerous.

For example:
di->life_sec = -((di->accum_current_uAh - di->empty_uAh) *
                 3600) / di->current_uA;

It can be also solved (and I voting for it) by typecasting to long
in the driver itself.

Would it also make sense to use int64_t instead of long? And how should
it passed to printk in portable way? I guess printk (vsprintf) does not
support PRIx notation as defined in /usr/include/inttypes.h ?

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