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+.\" Copyright (c) 2002 Nicolas Souchu
+.\" 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.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd April 20, 2002
+.Dt VIAPM 4
+.Os
+.Sh NAME
+.Nm viapm
+.Nd VIA chipsets Power Management controller driver
+.Sh SYNOPSIS
+.Cd device iicbb
+.Cd device iicbus
+.Cd device iicsmb
+.Cd device smbus
+.Cd device smb
+.Cd device viapm
+.Sh DESCRIPTION
+This driver provides access to the
+.Tn "VIA chipset Power Management Unit"
+family.
+They are
+VT82C586B, VT82C596A, VT82C596B, VT82C686A and VT8233.
+.Pp
+The embedded controller of the VIA chipset may give you access
+to the monitoring facilities of your mainboard.
+.Pp
+The 586B support is made by software whereas other controllers support
+the SMBus protocol by hardware.
+See
+.Xr smb 4
+for writing user code to fetch voltages, temperature and so on from the
+monitoring chip of your mainboard.
+.Sh SEE ALSO
+.Xr iicbb 4 ,
+.Xr iicbus 4 ,
+.Xr iicsmb 4 ,
+.Xr smb 4 ,
+.Xr smbus 4
+.Sh HISTORY
+The
+.Nm
+manual page first appeared in
+.Fx 4.5 .
+.Sh AUTHORS
+This
+manual page was written by
+.An Nicolas Souchu Aq nsouch@FreeBSD.org .
+.Sh BUGS
+Only polling mode is supported.