smsc —
Standard Microsystems Corporation LPC47B397 Super I/O
The smsc driver provides support for the hardware
  monitoring portion of the Standard Microsystems Corporation LPC47B397,
  SCH5307-NS, and SCH5317 Super I/O chips to be used with the
  envsys(4) API.
The chip supports 8 sensor inputs:
  
    | Sensor | Units | Typical Use | 
  
    | Temp0 | uK | CPU 1 Temperature | 
  
    | Temp1 | uK | CPU 2 Temperature | 
  
    | Temp2 | uK | Ambient Temperature | 
  
    | Temp3 | uK | unused | 
  
    | Fan0 | RPM | CPU 1 Fan | 
  
    | Fan1 | RPM | unused | 
  
    | Fan2 | RPM | unused | 
  
    | Fan3 | RPM | CPU 2 Fan | 
Motherboards with the chip supported by the smsc driver
  include:
  - Tyan Thunder K8WE (S2895)
Thesmsc device appeared in NetBSD
  5.0.