projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 195a4b42 IH |
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) |