This driver provides access to the
VIA chipset Power Management Unit
family.
They are
VT82C586B, VT82C596A, VT82C596B, VT82C686A and VT8233.
The embedded controller of the VIA chipset may give you access
to the monitoring facilities of your mainboard.
The 586B support is made by software whereas other controllers support
the SMBus protocol by hardware.
See
smb(4)
for writing user code to fetch voltages, temperature and so on from the
monitoring chip of your mainboard.