Documentation/hwmon/max6639.rst

   1 Kernel driver max6639
   2 =====================
   3
   4 Supported chips:
   5
   6   * Maxim MAX6639
   7
   8     Prefix: 'max6639'
   9
  10     Addresses scanned: I2C 0x2c, 0x2e, 0x2f
  11
  12     Datasheet: http://pdfserv.maxim-ic.com/en/ds/MAX6639.pdf
  13
  14 Authors:
  15     - He Changqing <hechangqing@semptian.com>
  16     - Roland Stigge <stigge@antcom.de>
  17
  18 Description
  19 -----------
  20
  21 This driver implements support for the Maxim MAX6639. This chip is a 2-channel
  22 temperature monitor with dual PWM fan speed controller. It can monitor its own
  23 temperature and one external diode-connected transistor or two external
  24 diode-connected transistors.
  25
  26 The following device attributes are implemented via sysfs:
  27
  28 ====================== ==== ===================================================
  29 Attribute              R/W  Contents
  30 ====================== ==== ===================================================
  31 temp1_input            R    Temperature channel 1 input (0..150 C)
  32 temp2_input            R    Temperature channel 2 input (0..150 C)
  33 temp1_fault            R    Temperature channel 1 diode fault
  34 temp2_fault            R    Temperature channel 2 diode fault
  35 temp1_max              RW   Set THERM temperature for input 1
  36                             (in C, see datasheet)
  37 temp2_max              RW   Set THERM temperature for input 2
  38 temp1_crit             RW   Set ALERT temperature for input 1
  39 temp2_crit             RW   Set ALERT temperature for input 2
  40 temp1_emergency        RW   Set OT temperature for input 1
  41                             (in C, see datasheet)
  42 temp2_emergency        RW   Set OT temperature for input 2
  43 pwm1                   RW   Fan 1 target duty cycle (0..255)
  44 pwm2                   RW   Fan 2 target duty cycle (0..255)
  45 fan1_input             R    TACH1 fan tachometer input (in RPM)
  46 fan2_input             R    TACH2 fan tachometer input (in RPM)
  47 fan1_fault             R    Fan 1 fault
  48 fan2_fault             R    Fan 2 fault
  49 temp1_max_alarm        R    Alarm on THERM temperature on channel 1
  50 temp2_max_alarm        R    Alarm on THERM temperature on channel 2
  51 temp1_crit_alarm       R    Alarm on ALERT temperature on channel 1
  52 temp2_crit_alarm       R    Alarm on ALERT temperature on channel 2
  53 temp1_emergency_alarm  R    Alarm on OT temperature on channel 1
  54 temp2_emergency_alarm  R    Alarm on OT temperature on channel 2
  55 ====================== ==== ===================================================