| Kernel driver max31790 |
| ====================== |
| |
| Supported chips: |
| |
| * Maxim MAX31790 |
| |
| Prefix: 'max31790' |
| |
| Addresses scanned: - |
| |
| Datasheet: https://pdfserv.maximintegrated.com/en/ds/MAX31790.pdf |
| |
| Author: Il Han <corone.il.han@gmail.com> |
| |
| |
| Description |
| ----------- |
| |
| This driver implements support for the Maxim MAX31790 chip. |
| |
| The MAX31790 controls the speeds of up to six fans using six independent |
| PWM outputs. The desired fan speeds (or PWM duty cycles) are written |
| through the I2C interface. The outputs drive "4-wire" fans directly, |
| or can be used to modulate the fan's power terminals using an external |
| pass transistor. |
| |
| Tachometer inputs monitor fan tachometer logic outputs for precise (+/-1%) |
| monitoring and control of fan RPM as well as detection of fan failure. |
| Six pins are dedicated tachometer inputs. Any of the six PWM outputs can |
| also be configured to serve as tachometer inputs. |
| |
| |
| Sysfs entries |
| ------------- |
| |
| ================== === ======================================================= |
| fan[1-12]_input RO fan tachometer speed in RPM |
| fan[1-12]_fault RO fan experienced fault |
| fan[1-6]_target RW desired fan speed in RPM |
| fan[1-6]_enable RW enable or disable the tachometer input |
| pwm[1-6]_enable RW regulator mode, 0=disabled (duty cycle=0%), 1=manual mode, 2=rpm mode |
| pwm[1-6] RW read: current pwm duty cycle, |
| write: target pwm duty cycle (0-255) |
| ================== === ======================================================= |
