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