Kernel driver nct7904¶
Supported chip:
Nuvoton NCT7904D
Prefix: nct7904
Addresses: I2C 0x2d, 0x2e
Datasheet: Publicly available at Nuvoton website
Author: Vadim V. Vlasov <vvlasov@dev.rtsoft.ru>
Description¶
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.
Limitations¶
The following features are not supported in current version:
SmartFan control
Watchdog
GPIO
external temperature sensors
SMI
min/max values
many other…