Documentation/hwmon/nct7904

   1 Kernel driver nct7904
   2 ====================
   3
   4 Supported chip:
   5   * Nuvoton NCT7904D
   6     Prefix: nct7904
   7     Addresses: I2C 0x2d, 0x2e
   8     Datasheet: Publicly available at Nuvoton website
   9         http://www.nuvoton.com/
  10
  11 Author: Vadim V. Vlasov <vvlasov@dev.rtsoft.ru>
  12
  13
  14 Description
  15 -----------
  16
  17 The NCT7904D is a hardware monitor supporting up to 20 voltage sensors,
  18 internal temperature sensor, Intel PECI and AMD SB-TSI CPU temperature
  19 interface, up to 12 fan tachometer inputs, up to 4 fan control channels
  20 with SmartFan.
  21
  22
  23 Sysfs entries
  24 -------------
  25
  26 Currently, the driver supports only the following features:
  27
  28 in[1-20]_input          Input voltage measurements (mV)
  29
  30 fan[1-12]_input         Fan tachometer measurements (rpm)
  31
  32 temp1_input             Local temperature (1/1000 degree,
  33                         0.125 degree resolution)
  34
  35 temp[2-9]_input         CPU temperatures (1/1000 degree,
  36                         0.125 degree resolution)
  37
  38 pwm[1-4]_enable         R/W, 1/2 for manual or SmartFan mode
  39                         Setting SmartFan mode is supported only if it has been
  40                         previously configured by BIOS (or configuration EEPROM)
  41
  42 pwm[1-4]                R/O in SmartFan mode, R/W in manual control mode
  43
  44 The driver checks sensor control registers and does not export the sensors
  45 that are not enabled. Anyway, a sensor that is enabled may actually be not
  46 connected and thus provide zero readings.
  47
  48
  49 Limitations
  50 -----------
  51
  52 The following features are not supported in current version:
  53
  54  - SmartFan control
  55  - Watchdog
  56  - GPIO
  57  - external temperature sensors
  58  - SMI
  59  - min/max values
  60  - many other...