linux-kernel - Re: [ibm-acpi-devel] [RFC] Controlling the ThinkPad battery charger

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Message-ID: <20110510184302.GA15631@localhost.ucw.cz>
Date:	Tue, 10 May 2011 18:43:02 +0000
From:	Pavel Machek <pavel@....cz>
To:	Henrique de Moraes Holschuh <hmh@....eng.br>
Cc:	Andrew Lutomirski <luto@....edu>,
	ibm-acpi-devel@...ts.sourceforge.net,
	Anton Vorontsov <cbou@...l.ru>,
	David Woodhouse <dwmw2@...radead.org>,
	linux-kernel@...r.kernel.org, platform-driver-x86@...r.kernel.org
Subject: Re: [ibm-acpi-devel] [RFC] Controlling the ThinkPad battery charger

On Mon 2011-05-09 12:29:41, Henrique de Moraes Holschuh wrote:
> On Mon, 09 May 2011, Andrew Lutomirski wrote:
> > > The SBS interface exposes more data about the battery, including
> > > per-cell-group voltage and pack microcontroller aging counters, alarms, and
> > > the "needs to get through the fuel-gaugue reset procedure" semasphore.
> > 
> > If I'm feeling really motivated, I'll look at that.  I'm currently
> > more interested in the charging thresholds, though, which I think is
> > independent of the choice of SBS vs ACPI to access the battery state.
> > (From a quick glance at the SBS spec, you can inhibit charging
> > entirely but you can't ask for thresholds.  I assume that the EC takes
> > care of that.  If I'm wrong, please tell me, but SMAPI seems like a
> > fine way to access the thresholds.)
> 
> Yeah, SMAPI is the safest way to deal with all this.  It is an interface
> layer that Lenovo is not fond of breaking (or touches very rarely.  Amounts
> to the same in the end).
> 
> SBS does not take care of thresholds, indeed.  The EC does (and I know how
> to program the threshold in a few models, if you do want to test it in your
> X220, I can send you the information.  It is safe to test if you use it
> together with SMAPI to cross-check).

Hmm, I jave a battery pack with reasonably good cells, but firmware killed it. IOW available for testing.

(And who know, perhaps recalibrate command would bring it back to life?)
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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