| VIAPM(4) | Device Drivers Manual | VIAPM(4) |
viapm — VIA SMBus
controller and VIA VT82C686A/VT8231 hardware monitor
viapm* at pci?
iic* at viapm?
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, VX855 and VX900 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.
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.
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.
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 5, 2018 | openbsd |