| Il Han | 195a4b4 | 2015-08-30 20:44:26 +0900 | [diff] [blame] | 1 | Kernel driver max31790 |
| 2 | ====================== |
| 3 | |
| 4 | Supported chips: |
| 5 | * Maxim MAX31790 |
| 6 | Prefix: 'max31790' |
| 7 | Addresses scanned: - |
| 8 | Datasheet: http://pdfserv.maximintegrated.com/en/ds/MAX31790.pdf |
| 9 | |
| 10 | Author: Il Han <corone.il.han@gmail.com> |
| 11 | |
| 12 | |
| 13 | Description |
| 14 | ----------- |
| 15 | |
| 16 | This driver implements support for the Maxim MAX31790 chip. |
| 17 | |
| 18 | The MAX31790 controls the speeds of up to six fans using six independent |
| 19 | PWM outputs. The desired fan speeds (or PWM duty cycles) are written |
| 20 | through the I2C interface. The outputs drive "4-wire" fans directly, |
| 21 | or can be used to modulate the fan's power terminals using an external |
| 22 | pass transistor. |
| 23 | |
| 24 | Tachometer inputs monitor fan tachometer logic outputs for precise (+/-1%) |
| 25 | monitoring and control of fan RPM as well as detection of fan failure. |
| 26 | Six pins are dedicated tachometer inputs. Any of the six PWM outputs can |
| 27 | also be configured to serve as tachometer inputs. |
| 28 | |
| 29 | |
| 30 | Sysfs entries |
| 31 | ------------- |
| 32 | |
| 33 | fan[1-12]_input RO fan tachometer speed in RPM |
| 34 | fan[1-12]_fault RO fan experienced fault |
| 35 | fan[1-6]_target RW desired fan speed in RPM |
| 36 | pwm[1-6]_enable RW regulator mode, 0=disabled, 1=manual mode, 2=rpm mode |
| 37 | pwm[1-6] RW fan target duty cycle (0-255) |