blob: 57fffe33ebfcdef2c9b52831667e147007c9454e [file] [log] [blame]
Kernel driver nct7904
Supported chip:
* Nuvoton NCT7904D
Prefix: nct7904
Addresses: I2C 0x2d, 0x2e
Datasheet: Publicly available at Nuvoton website
Author: Vadim V. Vlasov <>
The NCT7904D is a hardware monitor supporting up to 20 voltage sensors,
internal temperature sensor, Intel PECI and AMD SB-TSI CPU temperature
interface, up to 12 fan tachometer inputs, up to 4 fan control channels
with SmartFan.
Sysfs entries
Currently, the driver supports only the following features:
in[1-20]_input Input voltage measurements (mV)
fan[1-12]_input Fan tachometer measurements (rpm)
temp1_input Local temperature (1/1000 degree,
0.125 degree resolution)
temp[2-9]_input CPU temperatures (1/1000 degree,
0.125 degree resolution)
pwm[1-4]_enable R/W, 1/2 for manual or SmartFan mode
Setting SmartFan mode is supported only if it has been
previously configured by BIOS (or configuration EEPROM)
pwm[1-4] R/O in SmartFan mode, R/W in manual control mode
The driver checks sensor control registers and does not export the sensors
that are not enabled. Anyway, a sensor that is enabled may actually be not
connected and thus provide zero readings.
The following features are not supported in current version:
- SmartFan control
- Watchdog
- external temperature sensors
- min/max values
- many other...