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VIASIO(4)                BSD Kernel Interfaces Manual                VIASIO(4)

NAME
     viasio -- VIA VT1211 LPC Super I/O

SYNOPSIS
     viasio* at isa? port 0x2e flags 0x0000
     viasio* at isa? port 0x4e flags 0x0000

DESCRIPTION
     The viasio driver provides support for the VIA VT1211 LPC Super I/O IC.
     The hardware monitoring and watchdog timer functions are currently sup-
     ported.

     The hardware monitor provides hardware monitoring capabilities to be used
     with the sysctl(8) interface.  The following monitoring sensors are
     available:

           Sensor    Units         Typical use
           TEMP1     uK            Pentium II type thermal diode
           UCH1      uK or uV DC   CPU temperature
           UCH2      uK or uV DC   System temperature
           UCH3      uK or uV DC   CPU core voltage
           UCH4      uK or uV DC   +5V
           UCH5      uK or uV DC   +12V
           +3.3V     uV            Internal +3.3V
           FAN1      RPM           Fan tachometer
           FAN2      RPM           Fan tachometer

     If the hardware monitor is not enabled by firmware, the driver can try to
     enable it if value 0x0001 is present in the flags.  Note that enabling
     the hardware monitor can lead to unexpected results.

     The watchdog timer provides a standard watchdog(4) interface.  If the
     watchdog timer is not enabled by firmware, the driver can try to enable
     it if value 0x0002 is present in the flags.

SEE ALSO
     intro(4), isa(4), watchdog(4), sensorsd(8), sysctl(8)

HISTORY
     The viasio driver first appeared in OpenBSD 3.8.

AUTHORS
     The viasio driver was written by Alexander Yurchenko
     <grange@openbsd.org>.

BSD                              May 27, 2017                              BSD