projects / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 08bad5a8 MB |
1 | Kernel driver wm831x-hwmon |
| 2 | ========================== | |
| 3 | ||
| 4 | Supported 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 | ||
| 12 | Authors: Mark Brown <[email protected]> | |
| 13 | ||
| 14 | Description | |
| 15 | ----------- | |
| 16 | ||
| 17 | The WM831x series of PMICs include an AUXADC which can be used to | |
| 18 | monitor a range of system operating parameters, including the voltages | |
| 19 | of the major supplies within the system. Currently the driver provides | |
| 20 | reporting of all the input values but does not provide any alarms. | |
| 21 | ||
| 22 | Voltage Monitoring | |
| 23 | ------------------ | |
| 24 | ||
| 91fe4d50 | 25 | Voltages are sampled by a 12 bit ADC. Voltages in millivolts are 1.465 |
| 08bad5a8 MB |
26 | times the ADC value. |
| 27 | ||
| 28 | Temperature Monitoring | |
| 29 | ---------------------- | |
| 30 | ||
| 31 | Temperatures are sampled by a 12 bit ADC. Chip and battery temperatures | |
| 32 | are available. The chip temperature is calculated as: | |
| 33 | ||
| 34 | Degrees celsius = (512.18 - data) / 1.0983 | |
| 35 | ||
| 36 | while the battery temperature calculation will depend on the NTC | |
| 37 | thermistor component. |