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VIAPM(4)                 BSD Kernel Interfaces Manual                 VIAPM(4)

NAME
     viapm -- VIA 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 manage-
     ment 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.

BSD                             March 24, 2017                             BSD