projects / mirror_ubuntu-bionic-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| 983b97be HK |
1 | Kernel driver adt7410 |
| 2 | ===================== | |
| 3 | ||
| 4 | Supported chips: | |
| 5 | * Analog Devices ADT7410 | |
| 6 | Prefix: 'adt7410' | |
| ab302bb0 | 7 | Addresses scanned: None |
| 983b97be HK |
8 | Datasheet: Publicly available at the Analog Devices website |
| 9 | http://www.analog.com/static/imported-files/data_sheets/ADT7410.pdf | |
| ab302bb0 JD |
10 | * Analog Devices ADT7420 |
| 11 | Prefix: 'adt7420' | |
| 12 | Addresses scanned: None | |
| 13 | Datasheet: Publicly available at the Analog Devices website | |
| 14 | http://www.analog.com/static/imported-files/data_sheets/ADT7420.pdf | |
| 983b97be HK |
15 | |
| 16 | Author: Hartmut Knaack <knaack.h@gmx.de> | |
| 17 | ||
| 18 | Description | |
| 19 | ----------- | |
| 20 | ||
| 21 | The ADT7410 is a temperature sensor with rated temperature range of -55°C to | |
| 22 | +150°C. It has a high accuracy of +/-0.5°C and can be operated at a resolution | |
| 23 | of 13 bits (0.0625°C) or 16 bits (0.0078°C). The sensor provides an INT pin to | |
| 24 | indicate that a minimum or maximum temperature set point has been exceeded, as | |
| 25 | well as a critical temperature (CT) pin to indicate that the critical | |
| 26 | temperature set point has been exceeded. Both pins can be set up with a common | |
| 27 | hysteresis of 0°C - 15°C and a fault queue, ranging from 1 to 4 events. Both | |
| 28 | pins can individually set to be active-low or active-high, while the whole | |
| 29 | device can either run in comparator mode or interrupt mode. The ADT7410 | |
| 30 | supports continous temperature sampling, as well as sampling one temperature | |
| 31 | value per second or even justget one sample on demand for power saving. | |
| 32 | Besides, it can completely power down its ADC, if power management is | |
| 33 | required. | |
| 34 | ||
| ab302bb0 JD |
35 | The ADT7420 is register compatible, the only differences being the package, |
| 36 | a slightly narrower operating temperature range (-40°C to +150°C), and a | |
| 37 | better accuracy (0.25°C instead of 0.50°C.) | |
| 38 | ||
| 983b97be HK |
39 | Configuration Notes |
| 40 | ------------------- | |
| 41 | ||
| 42 | Since the device uses one hysteresis value, which is an offset to minimum, | |
| 43 | maximum and critical temperature, it can only be set for temp#_max_hyst. | |
| 44 | However, temp#_min_hyst and temp#_crit_hyst show their corresponding | |
| 45 | hysteresis. | |
| 46 | The device is set to 16 bit resolution and comparator mode. | |
| 47 | ||
| 48 | sysfs-Interface | |
| 49 | --------------- | |
| 50 | ||
| 51 | temp#_input - temperature input | |
| 52 | temp#_min - temperature minimum setpoint | |
| 53 | temp#_max - temperature maximum setpoint | |
| 54 | temp#_crit - critical temperature setpoint | |
| 55 | temp#_min_hyst - hysteresis for temperature minimum (read-only) | |
| 56 | temp#_max_hyst - hysteresis for temperature maximum (read/write) | |
| 57 | temp#_crit_hyst - hysteresis for critical temperature (read-only) | |
| 58 | temp#_min_alarm - temperature minimum alarm flag | |
| 59 | temp#_max_alarm - temperature maximum alarm flag | |
| 60 | temp#_crit_alarm - critical temperature alarm flag |