xref: /linux/Documentation/hwmon/w83l786ng.rst (revision 4b4193256c8d3bc3a5397b5cd9494c2ad386317d)
1Kernel driver w83l786ng
2=======================
3
4Supported chips:
5
6  * Winbond W83L786NG/W83L786NR
7
8    Prefix: 'w83l786ng'
9
10    Addresses scanned: I2C 0x2e - 0x2f
11
12    Datasheet: http://www.winbond-usa.com/products/winbond_products/pdfs/PCIC/W83L786NRNG09.pdf
13
14Author: Kevin Lo <kevlo@kevlo.org>
15
16
17Module Parameters
18-----------------
19
20* reset boolean
21    (default 0)
22
23    Use 'reset=1' to reset the chip (via index 0x40, bit 7). The default
24    behavior is no chip reset to preserve BIOS settings
25
26
27Description
28-----------
29
30This driver implements support for Winbond W83L786NG/W83L786NR chips.
31
32The driver implements two temperature sensors, two fan rotation speed
33sensors, and three voltage sensors.
34
35Temperatures are measured in degrees Celsius and measurement resolution is 1
36degC for temp1 and temp2.
37
38Fan rotation speeds are reported in RPM (rotations per minute). Fan readings
39can be divided by a programmable divider (1, 2, 4, 8, 16, 32, 64
40or 128 for fan 1/2) to give the readings more range or accuracy.
41
42Voltage sensors (also known as IN sensors) report their values in millivolts.
43An alarm is triggered if the voltage has crossed a programmable minimum
44or maximum limit.
45
46/sys files
47----------
48
49pwm[1-2]
50	    - this file stores PWM duty cycle or DC value (fan speed) in range:
51
52	      0 (stop) to 255 (full)
53pwm[1-2]_enable
54	    - this file controls mode of fan/temperature control:
55
56	    * 0 Manual Mode
57	    * 1 Thermal Cruise
58	    * 2 Smart Fan II
59	    * 4 FAN_SET
60pwm[1-2]_mode
61	    - Select PWM of DC mode
62
63	    * 0 DC
64	    * 1 PWM
65tolerance[1-2]
66	    - Value in degrees of Celsius (degC) for +- T
67