swh:1:snp:173f8deb0c56c557784b4fd217e7608ac6197844
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Tip revision: b01543dfe67bb1d191998e90d20534dc354de059 authored by Linus Torvalds on 18 February 2012, 23:53:33 UTC
Linux 3.3-rc4
Linux 3.3-rc4
Tip revision: b01543d
wm831x
Kernel driver wm831x-hwmon
==========================
Supported chips:
* Wolfson Microelectronics WM831x PMICs
Prefix: 'wm831x'
Datasheet:
http://www.wolfsonmicro.com/products/WM8310
http://www.wolfsonmicro.com/products/WM8311
http://www.wolfsonmicro.com/products/WM8312
Authors: Mark Brown <broonie@opensource.wolfsonmicro.com>
Description
-----------
The WM831x series of PMICs include an AUXADC which can be used to
monitor a range of system operating parameters, including the voltages
of the major supplies within the system. Currently the driver provides
reporting of all the input values but does not provide any alarms.
Voltage Monitoring
------------------
Voltages are sampled by a 12 bit ADC. Voltages in milivolts are 1.465
times the ADC value.
Temperature Monitoring
----------------------
Temperatures are sampled by a 12 bit ADC. Chip and battery temperatures
are available. The chip temperature is calculated as:
Degrees celsius = (512.18 - data) / 1.0983
while the battery temperature calculation will depend on the NTC
thermistor component.