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Date: Fri, 21 Oct 2011 03:03:59 +1100 (EST)
From: Ian Smith <smithi@nimnet.asn.au>
To: Dmitry Kolosov <onyx@z-up.ru>
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Cc: freebsd-mobile@freebsd.org
Subject: Re: Battery charge limiting
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On Thu, 20 Oct 2011, Dmitry Kolosov wrote:
 > > for thinkpads, there is no need to reverse any win32 stuff.. there is a
 > > linux driver that accesses the EC and is able to get/set battery
 > > parameters (among other stuff, like HDAPS) called tp_smapi
 > > (http://sourceforge.net/projects/tpctl/)
 > 
 > Ok. It looks like not every EC capable to be controlled, there is some kind of 
 > active and passive ECs. How we can guess the one IS capable? May be presence 
 > of some ACPI methods is the symptom of such capabilities? Any suggestions?

http://www.thinkwiki.org/wiki/Tp_smapi has a table of which Thinkpad 
models support what tp_smapi features.  It's not clear to me whether 
any of this is exposed through ACPI tables, or whether it's all more 
direct hardware access .. sounds like a fun project if anyone has the 
time and energy to play with it though :)

Thanls for the earlier references.  Interesting.

cheers, Ian