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Vadim V. Vlasov9c947d22015-02-27 16:16:00 +03001Kernel driver nct7904
2====================
3
4Supported 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
11Author: Vadim V. Vlasov <vvlasov@dev.rtsoft.ru>
12
13
14Description
15-----------
16
17The NCT7904D is a hardware monitor supporting up to 20 voltage sensors,
18internal temperature sensor, Intel PECI and AMD SB-TSI CPU temperature
19interface, up to 12 fan tachometer inputs, up to 4 fan control channels
20with SmartFan.
21
22
23Sysfs entries
24-------------
25
26Currently, the driver supports only the following features:
27
28in[1-20]_input Input voltage measurements (mV)
29
30fan[1-12]_input Fan tachometer measurements (rpm)
31
32temp1_input Local temperature (1/1000 degree,
33 0.125 degree resolution)
34
35temp[2-9]_input CPU temperatures (1/1000 degree,
36 0.125 degree resolution)
37
Guenter Roeck0d6aaff2015-07-27 10:21:46 -070038pwm[1-4]_enable R/W, 1/2 for manual or SmartFan mode
Vadim V. Vlasov9c947d22015-02-27 16:16:00 +030039 Setting SmartFan mode is supported only if it has been
40 previously configured by BIOS (or configuration EEPROM)
41
Guenter Roeck0d6aaff2015-07-27 10:21:46 -070042pwm[1-4] R/O in SmartFan mode, R/W in manual control mode
Vadim V. Vlasov9c947d22015-02-27 16:16:00 +030043
44The driver checks sensor control registers and does not export the sensors
45that are not enabled. Anyway, a sensor that is enabled may actually be not
46connected and thus provide zero readings.
47
48
49Limitations
50-----------
51
52The 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...