Kernel driver emc2103
  ======================
  
  Supported chips:
    * SMSC EMC2103
      Addresses scanned: I2C 0x2e
      Prefix: 'emc2103'
      Datasheet: Not public
  
  Authors:
          Steve Glendinning <steve.glendinning@smsc.com>
  
  Description
  -----------
  
  The Standard Microsystems Corporation (SMSC) EMC2103 chips
  contain up to 4 temperature sensors and a single fan controller.
  
  Fan rotation speeds are reported in RPM (rotations per minute). An alarm is
  triggered if the rotation speed has dropped below a programmable limit. Fan
  readings can be divided by a programmable divider (1, 2, 4 or 8) to give
  the readings more range or accuracy. Not all RPM values can accurately be
  represented, so some rounding is done. With a divider of 1, the lowest
  representable value is 480 RPM.
  
  This driver supports RPM based control, to use this a fan target
  should be written to fan1_target and pwm1_enable should be set to 3.
  
  The 2103-2 and 2103-4 variants have a third temperature sensor, which can
  be connected to two anti-parallel diodes.  These values can be read
  as temp3 and temp4.  If only one diode is attached to this channel, temp4
  will show as "fault".  The module parameter "apd=0" can be used to suppress
  this 4th channel when anti-parallel diodes are not fitted.