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+.\" $NetBSD: battery_pmu.4,v 1.5 2009/05/18 14:41:41 wiz Exp $
+.\"
+.\" Copyright (c) 2007
+.\" Michael Lorenz. All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\" notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\" notice, this list of conditions and the following disclaimer in the
+.\" documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.Dd May 18, 2009
+.Dt BATTERY_PMU 4
+.Os
+.Sh NAME
+.Nm battery_pmu
+.Nd support for batteries and sensors in PCI-based Apple Powerbooks
+.Sh SYNOPSIS
+.Cd "battery* at pmu?"
+.Sh DESCRIPTION
+The
+.Nm
+driver provides support for batteries and hardware sensors found
+in first generation PCI-based PowerBooks (i.e. Apple Powerbook
+2400, 3400 and 3500 (also known as Original PowerBook G3).
+Currently it only exports a few sensors via the
+.Xr envsys 4
+interface, including battery charge, voltage, CPU and battery
+temperature and AC power availability.
+.Sh SEE ALSO
+.Xr envsys 4 ,
+.Xr pmu 4 ,
+.Xr envstat 8
+.Sh BUGS
+There is no APM emulation right now and the battery current sensor
+may return misleading or wrong data.
+This driver is considered preliminary and may be replaced at some
+point.