linux-kernel - Re: [PATCH 3/5] power_supply: add a TRICKLE_CHARGING status, and add it to the olpc driver

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Message-ID: <20090623103717.GH5422@sirena.org.uk>
Date:	Tue, 23 Jun 2009 11:37:17 +0100
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	Andres Salomon <dilinger@...labora.co.uk>
Cc:	cbou@...l.ru, dwmw2@...radead.org, linux-kernel@...r.kernel.org,
	richard@...top.org, Andrew Morton <akpm@...ux-foundation.org>,
	Paul Fox <pgf@...top.org>, dsaxena@...top.org
Subject: Re: [PATCH 3/5] power_supply: add a TRICKLE_CHARGING status, and
 add it to the olpc driver

On Mon, Jun 22, 2009 at 11:46:07PM -0400, Andres Salomon wrote:

> The hardware has an extra bit that specifies that the battery is trickle
> charging, so when determining if the battery is present/charging the TRICKLE
> bit needs to be checked as well.  Because battery diagnostics might want to
> know whether trickle charging is happening or not, and also because trickle
> charging falls somewhere between charging and not charging (read: Richard got
> mad at me when I tried to set CHARGING when in trickle charge.  He gets so
> angry sometimes), we add a new TRICKLE status to sysfs.

To avoid confusing usere applications might it be better to add another
piece of information with detail on the charger status rather than a new
state?  The fact that the new state name shares a prefix with the
regular charging state does help here but you might still confuse things
and it makes the name of the new state in sysfs a bit awkward.

I'd also be tempted to do this the other way around and add a fast
charge status; certainly in embedded cases trickle charging is more of a
default state since it requires less incoming power (important if you're
using USB) and there's less risk of damage to the battery.
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