1 Kernel driver wm831x-hwmon 1 Kernel driver wm831x-hwmon
2 ========================== 2 ==========================
3 3
4 Supported chips: 4 Supported chips:
5 * Wolfson Microelectronics WM831x PMICs 5 * Wolfson Microelectronics WM831x PMICs
6 6
7 Prefix: 'wm831x' 7 Prefix: 'wm831x'
8 8
9 Datasheet: 9 Datasheet:
10 10
11 - http://www.wolfsonmicro.com/products 11 - http://www.wolfsonmicro.com/products/WM8310
12 - http://www.wolfsonmicro.com/products 12 - http://www.wolfsonmicro.com/products/WM8311
13 - http://www.wolfsonmicro.com/products 13 - http://www.wolfsonmicro.com/products/WM8312
14 14
15 Authors: Mark Brown <broonie@opensource.wolfson 15 Authors: Mark Brown <broonie@opensource.wolfsonmicro.com>
16 16
17 Description 17 Description
18 ----------- 18 -----------
19 19
20 The WM831x series of PMICs include an AUXADC w 20 The WM831x series of PMICs include an AUXADC which can be used to
21 monitor a range of system operating parameters 21 monitor a range of system operating parameters, including the voltages
22 of the major supplies within the system. Curr 22 of the major supplies within the system. Currently the driver provides
23 reporting of all the input values but does not 23 reporting of all the input values but does not provide any alarms.
24 24
25 Voltage Monitoring 25 Voltage Monitoring
26 ------------------ 26 ------------------
27 27
28 Voltages are sampled by a 12 bit ADC. Voltage 28 Voltages are sampled by a 12 bit ADC. Voltages in millivolts are 1.465
29 times the ADC value. 29 times the ADC value.
30 30
31 Temperature Monitoring 31 Temperature Monitoring
32 ---------------------- 32 ----------------------
33 33
34 Temperatures are sampled by a 12 bit ADC. Chi 34 Temperatures are sampled by a 12 bit ADC. Chip and battery temperatures
35 are available. The chip temperature is calcul 35 are available. The chip temperature is calculated as:
36 36
37 Degrees celsius = (512.18 - data) / 1. 37 Degrees celsius = (512.18 - data) / 1.0983
38 38
39 while the battery temperature calculation will 39 while the battery temperature calculation will depend on the NTC
40 thermistor component. 40 thermistor component.
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