linux-kernel - Re: Smart Battery System Design (was: Re: Question about userspace-consumer)

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Message-ID: <20090814163201.GB1626@ucw.cz>
Date:	Fri, 14 Aug 2009 18:32:01 +0200
From:	Pavel Machek <pavel@....cz>
To:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
Cc:	Felipe Balbi <me@...ipebalbi.com>,
	Liam Girdwood <lrg@...mlogic.co.uk>,
	Mike Rapoport <mike@...pulab.co.il>,
	linux-kernel@...r.kernel.org
Subject: Re: Smart Battery System Design (was: Re: Question about
	userspace-consumer)

Hi!

> > and wrt SBS, that would mean basically writing a driver for that Smart
> > Batery Charger and the Smart Battery devices creating means for some
> > entity to tell _start_charging_ based on the presence of a power source.
> 
> For me the critical thing is that we ensure that the charger won't be
> left charging at anything more than a trickle charge when there's
> nothing monitoring the battery status.  If the charger can do the SBS
> charger stuff autononmously it can look after itself (but the use of the
> regulator API becomes more questionable for those devices since the
> charger will be doing all the management of the regulators).  If the SBS
> is done entirely in software the kernel at least needs to be able to
> notice the management software exiting and clean up after it, even if
> that's all it is able to do for itself.

Please don't put basic fastcharge logic to userspace:

* you still want to fastcharge at init=/bin/bash boot

* you want to fastcharge while machine is in s2ram. See spitz. Doing
  that with userspace would be quite tricky.

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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