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Mark Brown08bad5a2009-07-28 15:52:22 +01001Kernel driver wm831x-hwmon
2==========================
3
4Supported chips:
5 * Wolfson Microelectronics WM831x PMICs
6 Prefix: 'wm831x'
7 Datasheet:
8 http://www.wolfsonmicro.com/products/WM8310
9 http://www.wolfsonmicro.com/products/WM8311
10 http://www.wolfsonmicro.com/products/WM8312
11
12Authors: Mark Brown <broonie@opensource.wolfsonmicro.com>
13
14Description
15-----------
16
17The WM831x series of PMICs include an AUXADC which can be used to
18monitor a range of system operating parameters, including the voltages
19of the major supplies within the system. Currently the driver provides
20reporting of all the input values but does not provide any alarms.
21
22Voltage Monitoring
23------------------
24
25Voltages are sampled by a 12 bit ADC. Voltages in milivolts are 1.465
26times the ADC value.
27
28Temperature Monitoring
29----------------------
30
31Temperatures are sampled by a 12 bit ADC. Chip and battery temperatures
32are available. The chip temperature is calculated as:
33
34 Degrees celsius = (512.18 - data) / 1.0983
35
36while the battery temperature calculation will depend on the NTC
37thermistor component.