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To: jhb@FreeBSD.org
From: "M. Warner Losh" <imp@bsdimp.com>
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Cc: svn-src-head@FreeBSD.org, svn-src-all@FreeBSD.org,
	src-committers@FreeBSD.org, nwhitehorn@FreeBSD.org
Subject: Re: svn commit: r193159 - head/sys/powerpc/powermac
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In message: <200906010822.19951.jhb@freebsd.org>
            John Baldwin <jhb@FreeBSD.org> writes:
: On Sunday 31 May 2009 6:02:20 am Nathan Whitehorn wrote:
: > Author: nwhitehorn
: > Date: Sun May 31 10:02:20 2009
: > New Revision: 193159
: > URL: http://svn.freebsd.org/changeset/base/193159
: > 
: > Log:
: >   Provide an analogous sysctl to hw.acpi.acline (dev.pmu.0.acline) to
: >   determine whether the computer is plugged in to mains power.
: 
: I wonder if it would be a good idea to introduce a 
: platform-independent 'acline' sysctl?  Something like 'hw.acline'?  For now 
: we could simply have these devices create it.  We could do something fancier 
: where AC adapter drivers register with a centralized thingie at some point 
: and it exports a global setting that is true so long as at least one adapter 
: is online.  I'm not sure that level of complexity is warranted until we have 
: platforms with multiple AC lines exposed to the OS though.

We'll likely need some additional interface to the power system as
well.  acline is likely to be just the first one...

Warner