summaryrefslogtreecommitdiffstats
path: root/Documentation/hwmon/nct7904
blob: 014f112e2a14e19557878a250e30438fd8f91b73 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
Kernel driver nct7904
====================

Supported chip:
  * Nuvoton NCT7904D
    Prefix: nct7904
    Addresses: I2C 0x2d, 0x2e
    Datasheet: Publicly available at Nuvoton website
	http://www.nuvoton.com/

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)

fan[1-4]_mode		R/W, 0/1 for manual or SmartFan mode
			Setting SmartFan mode is supported only if it has been
			previously configured by BIOS (or configuration EEPROM)

fan[1-4]_pwm		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...
OpenPOWER on IntegriCloud