| Kernel driver max31785 |
| ====================== |
| |
| Supported chips: |
| * Maxim MAX31785 |
| Prefix: 'max31785' |
| Addresses scanned: 0x52 0x53 0x54 0x55 |
| Datasheet: http://pdfserv.maximintegrated.com/en/ds/MAX31785.pdf |
| |
| Author: Timothy Pearson <tpearson@raptorengineering.com> |
| |
| |
| Description |
| ----------- |
| |
| This driver implements support for the Maxim MAX31785 chip. |
| |
| The MAX31785 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. |
| |
| |
| Sysfs entries |
| ------------- |
| |
| fan[1-6]_input RO fan tachometer speed in RPM |
| fan[1-6]_fault RO fan experienced fault |
| fan[1-6]_pulses RW tachometer pulses per fan revolution |
| fan[1-6]_target RW desired fan speed in RPM |
| pwm[1-6]_enable RW pwm mode, 0=disabled, 1=pwm, 2=rpm, 3=automatic |
| pwm[1-6] RW fan target duty cycle (0-255) |
