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

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Message-ID: <20090812225312.GD4731@sirena.org.uk>
Date:	Wed, 12 Aug 2009 23:53:13 +0100
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	Felipe Balbi <me@...ipebalbi.com>
Cc:	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)

On Wed, Aug 12, 2009 at 10:07:03PM +0300, Felipe Balbi wrote:
> On Wed, Aug 12, 2009 at 11:05:17AM +0100, Mark Brown wrote:

> > You actually get notification on any change the supply chooses to notify
> > the core on IIRC.

> true, but that's only (at least on the chips I've seen) for the presence
> of the charger. I haven't seen a chip that notify you based on a
> threshold of e.g. voltage change or temperature change. Which would be a
> really nice feature: you could give a "best" temperature value and a
> threshold of +-10% and if that changes over that limit, device
> interrupts processor, or something like that.

If a chip has a generic AUX ADC (of the sort used for voltage
monitoring) it'll quite often also have some comparator functionality to
go along with it, normally configurable.
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