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+.\"	$OpenBSD: viapm.4,v 1.12 2018/07/05 10:09:11 fcambus Exp $
+.\"
+.\" Copyright (c) 2006 Mark Kettenis <kettenis@openbsd.org>
+.\"
+.\" Permission to use, copy, modify, and distribute this software for any
+.\" purpose with or without fee is hereby granted, provided that the above
+.\" copyright notice and this permission notice appear in all copies.
+.\"
+.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+.\"
+.Dd $Mdocdate: July 5 2018 $
+.Dt VIAPM 4
+.Os
+.Sh NAME
+.Nm viapm
+.Nd VIA SMBus controller and VIA VT82C686A/VT8231 hardware monitor
+.Sh SYNOPSIS
+.Cd "viapm* at pci?"
+.Cd "iic* at viapm?"
+.Sh DESCRIPTION
+The
+.Nm
+driver provides support for the bus control and power management
+component of the VIA VT82C596, VT82C596B, VT82C686A, VT8231, VT8233,
+VT8233A, VT8235, VT8237, VT8237A, VT8237S, VT8251, CX700, VX800,
+VX855 and VX900 South Bridges.
+Only the SMBus host interface is supported and can be used with the
+.Xr iic 4
+framework.
+.Pp
+The
+.Nm
+driver provides support for the hardware monitor in the 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 iic 4 ,
+.Xr intro 4 ,
+.Xr pci 4 ,
+.Xr sensorsd 8 ,
+.Xr sysctl 8
+.Sh HISTORY
+The
+.Nm
+driver first appeared in
+.Ox 3.9 .
+.Pp
+The
+.Nm viaenv
+driver first appeared in
+.Nx 1.5 .
+.Ox
+support was added in
+.Ox 3.4 .
+.Sh AUTHORS
+.An -nosplit
+The
+.Nm
+driver was written by
+.An Mark Kettenis Aq Mt kettenis@openbsd.org .
+.Pp
+The
+.Nm viaenv
+driver was written by
+.An Johan Danielsson
+and ported to
+.Ox 3.4
+by
+.An Alexander Yurchenko Aq Mt grange@openbsd.org .
+It was merged with
+.Nm
+in
+.Ox 5.0 .
+.Sh BUGS
+The driver doesn't support commands with a data buffer size of more
+than 2 bytes.
+.Pp
+Interrupt support is unimplemented, as is support for setting values.