Copyright (c) 2006 Mark Kettenis <kettenis@openbsd.org>
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.Dd $Mdocdate: July 16 2013 $ .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.
p 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.
p The device has 10 sensors: l -column "Sensor" "Units" "Typical" -offset indent t Sy "Sensor" Ta Sy "Units" Ta Sy "Typical Use" t Li "TSENS1" Ta "uK" Ta "CPU temperature" t Li "TSENS2" Ta "uK" Ta "System temperature" t Li "TSENS3" Ta "uK" Ta "Unknown" t Li "FAN1" Ta "RPM" Ta "CPU fan" t Li "FAN2" Ta "RPM" Ta "System fan" t Li "VSENS1" Ta "uV DC" Ta "CPU core voltage (2.0V)" t Li "VSENS2" Ta "uV DC" Ta "North Bridge core voltage (2.5V)" t Li "Vcore" Ta "uV DC" Ta "Internal core voltage (3.3V)" t Li "VSENS3" Ta "uV DC" Ta "+5V" t Li "VSENS4" Ta "uV DC" Ta "+12V" .El
p 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 .
p 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 .
p 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.
p Interrupt support is unimplemented, as is support for setting values.