.\"	$OpenBSD: viaenv.4,v 1.9 2005/03/17 13:36:00 jmc Exp $
.\"	$NetBSD: viaenv.4,v 1.5 2001/09/11 23:18:55 wiz Exp $
.\"
.\" Copyright (c) 2000 Johan Danielsson
.\" All rights reserved.
.\"
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.\" modification, are permitted provided that the following conditions
.\" are met:
.\"
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.\"    notice, this list of conditions and the following disclaimer.
.\"
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.\"
.\" 3. Neither the name of author nor the names of any contributors may
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS
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.Dd May 8, 2000
.Dt VIAENV 4
.Os
.Sh NAME
.Nm viaenv
.Nd VIA VT82C686A/VT8231 hardware monitor
.Sh SYNOPSIS
.Cd "viaenv* at pci?"
.Sh DESCRIPTION
The
.Nm
driver provides support for the hardware monitor and power management
timer in the
.Tn VIA
VT82C686A and VT8231 South Bridges.
The hardware monitor is used with the
.Xr sysctl 8
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 sensorsd 8 ,
.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.