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+.\"	$OpenBSD: viaenv.4,v 1.1 2003/04/25 21:53:20 grange Exp $
+.\"	$NetBSD: viaenv.4,v 1.5 2001/09/11 23:18:55 wiz Exp $
+.\"
+.\" Copyright (c) 2000 Johan Danielsson
+.\" 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.
+.\"
+.\" 3. Neither the name of author nor the names of any contributors may
+.\"    be used to endorse or promote products derived from this
+.\"    software without specific prior written permission.
+.\"
+.\" 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 FOUNDATION 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 8, 2000
+.Dt VIAENV 4
+.Os
+.Sh NAME
+.Nm viaenv
+.Nd VIA VT82C686A hardware monitor
+.Sh SYNOPSIS
+.Cd "viaenv* at pci? dev ? function ?"
+.Sh DESCRIPTION
+The
+.Nm
+driver provides support for the hardware monitor in the
+.Tn VIA
+VT82C686A South Bridge to be used with the
+.Xr sysctl 3
+interface.
+.Pp
+The device has 10 sensors:
+.Bl -column "Sensor" "Units" "Typical" -offset indent
+.It Sy "Sensor" Ta Sy "Units" Ta Sy "Typical Use"
+.It Li "TSENS1" Ta "uK" Ta "CPU temperature"
+.It Li "TSENS2" Ta "uK" Ta "System temperature"
+.It Li "TSENS3" Ta "uK" Ta "Unknown"
+.It Li "FAN1" Ta "RPM" Ta "CPU fan"
+.It Li "FAN2" Ta "RPM" Ta "System fan"
+.It Li "VSENS1" Ta "uV DC" Ta "CPU core voltage (2.0V)"
+.It Li "VSENS2" Ta "uV DC" Ta "North Bridge core voltage (2.5V)"
+.It Li "Vcore" Ta "uV DC" Ta "Internal core voltage (3.3V)"
+.It Li "VSENS3" Ta "uV DC" Ta "+5V"
+.It Li "VSENS4" Ta "uV DC" Ta "+12V"
+.El
+.Pp
+Sensor data is updated every 1.5 seconds.
+.Sh SEE ALSO
+.Xr sysctl 8
+.Sh HISTORY
+The
+.Nm
+driver first appeared in
+.Nx 1.5 ,
+.Ox
+support was added in
+.Ox 3.4 .
+.Sh AUTHORS
+The
+.Nm
+driver was written by
+.An Johan Danielsson
+and ported to
+.Ox 3.4
+by
+.An Alexander Yurchenko Aq grange@openbsd.org .
+.Sh BUGS
+Interrupt support is unimplemented, as is support for setting values.