linux/Documentation/hwmon/emc2103
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   1Kernel driver emc2103
   2======================
   3
   4Supported chips:
   5  * SMSC EMC2103
   6    Addresses scanned: I2C 0x2e
   7    Prefix: 'emc2103'
   8    Datasheet: Not public
   9
  10Authors:
  11        Steve Glendinning <steve.glendinning@smsc.com>
  12
  13Description
  14-----------
  15
  16The Standard Microsystems Corporation (SMSC) EMC2103 chips
  17contain up to 4 temperature sensors and a single fan controller.
  18
  19Fan rotation speeds are reported in RPM (rotations per minute). An alarm is
  20triggered if the rotation speed has dropped below a programmable limit. Fan
  21readings can be divided by a programmable divider (1, 2, 4 or 8) to give
  22the readings more range or accuracy. Not all RPM values can accurately be
  23represented, so some rounding is done. With a divider of 1, the lowest
  24representable value is 480 RPM.
  25
  26This driver supports RPM based control, to use this a fan target
  27should be written to fan1_target and pwm1_enable should be set to 3.
  28
  29The 2103-2 and 2103-4 variants have a third temperature sensor, which can
  30be connected to two anti-parallel diodes.  These values can be read
  31as temp3 and temp4.  If only one diode is attached to this channel, temp4
  32will show as "fault".  The module parameter "apd=0" can be used to suppress
  33this 4th channel when anti-parallel diodes are not fitted.
  34
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