[OpenBSD]

Manual Page Search Parameters

VIAPM(4) Device Drivers Manual VIAPM(4)

NAME

viapmVIA SMBus controller and VIA VT82C686A/VT8231 hardware monitor

SYNOPSIS

viapm* at pci?
iic* at viapm?

DESCRIPTION

The viapm 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 and VX855 South Bridges. Only the SMBus host interface is supported and can be used with the iic(4) framework.
The viapm driver provides support for the hardware monitor in the VIA VT82C686A and VT8231 South Bridges. The hardware monitor is used with the sysctl(8) interface.
The device has 10 sensors:
Sensor Units Typical Use
TSENS1 uK CPU temperature
TSENS2 uK System temperature
TSENS3 uK Unknown
FAN1 RPM CPU fan
FAN2 RPM System fan
VSENS1 uV DC CPU core voltage (2.0V)
VSENS2 uV DC North Bridge core voltage (2.5V)
Vcore uV DC Internal core voltage (3.3V)
VSENS3 uV DC +5V
VSENS4 uV DC +12V
Sensor data is updated every 1.5 seconds.

SEE ALSO

iic(4), intro(4), pci(4), sensorsd(8), sysctl(8)

HISTORY

The viapm driver first appeared in OpenBSD 3.9.
The viaenv driver first appeared in NetBSD 1.5. OpenBSD support was added in OpenBSD 3.4.

AUTHORS

The viapm driver was written by Mark Kettenis <kettenis@openbsd.org>.
The viaenv driver was written by Johan Danielsson and ported to OpenBSD 3.4 by Alexander Yurchenko <grange@openbsd.org>. It was merged with viapm in OpenBSD 5.0.

BUGS

The driver doesn't support commands with a data buffer size of more than 2 bytes.
Interrupt support is unimplemented, as is support for setting values.
July 16, 2013 OpenBSD-current