Documentation/hwmon/max31790

   1 Kernel driver max31790
   2 ======================
   3
   4 Supported chips:
   5   * Maxim MAX31790
   6     Prefix: 'max31790'
   7     Addresses scanned: -
   8     Datasheet: http://pdfserv.maximintegrated.com/en/ds/MAX31790.pdf
   9
  10 Author: Il Han <corone.il.han@gmail.com>
  11
  12
  13 Description
  14 -----------
  15
  16 This driver implements support for the Maxim MAX31790 chip.
  17
  18 The MAX31790 controls the speeds of up to six fans using six independent
  19 PWM outputs. The desired fan speeds (or PWM duty cycles) are written
  20 through the I2C interface. The outputs drive "4-wire" fans directly,
  21 or can be used to modulate the fan's power terminals using an external
  22 pass transistor.
  23
  24 Tachometer inputs monitor fan tachometer logic outputs for precise (+/-1%)
  25 monitoring and control of fan RPM as well as detection of fan failure.
  26 Six pins are dedicated tachometer inputs. Any of the six PWM outputs can
  27 also be configured to serve as tachometer inputs.
  28
  29
  30 Sysfs entries
  31 -------------
  32
  33 fan[1-12]_input    RO  fan tachometer speed in RPM
  34 fan[1-12]_fault    RO  fan experienced fault
  35 fan[1-6]_target    RW  desired fan speed in RPM
  36 pwm[1-6]_enable    RW  regulator mode, 0=disabled, 1=manual mode, 2=rpm mode
  37 pwm[1-6]           RW  fan target duty cycle (0-255)