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- Kernel driver max31785
- ======================
- Supported chips:
- * Maxim MAX31785, MAX31785A
- Prefix: 'max31785' or 'max31785a'
- Addresses scanned: -
- Datasheet: https://datasheets.maximintegrated.com/en/ds/MAX31785.pdf
- Author: Andrew Jeffery <andrew@aj.id.au>
- Description
- -----------
- The Maxim MAX31785 is a PMBus device providing closed-loop, multi-channel fan
- management with temperature and remote voltage sensing. Various fan control
- features are provided, including PWM frequency control, temperature hysteresis,
- dual tachometer measurements, and fan health monitoring.
- For dual-rotor configurations the MAX31785A exposes the second rotor tachometer
- readings in attributes fan[5-8]_input. By contrast the MAX31785 only exposes
- the slowest rotor measurement, and does so in the fan[1-4]_input attributes.
- Usage Notes
- -----------
- This driver does not probe for PMBus devices. You will have to instantiate
- devices explicitly.
- Sysfs attributes
- ----------------
- fan[1-4]_alarm Fan alarm.
- fan[1-4]_fault Fan fault.
- fan[1-8]_input Fan RPM. On the MAX31785A, inputs 5-8 correspond to the
- second rotor of fans 1-4
- fan[1-4]_target Fan input target
- in[1-6]_crit Critical maximum output voltage
- in[1-6]_crit_alarm Output voltage critical high alarm
- in[1-6]_input Measured output voltage
- in[1-6]_label "vout[18-23]"
- in[1-6]_lcrit Critical minimum output voltage
- in[1-6]_lcrit_alarm Output voltage critical low alarm
- in[1-6]_max Maximum output voltage
- in[1-6]_max_alarm Output voltage high alarm
- in[1-6]_min Minimum output voltage
- in[1-6]_min_alarm Output voltage low alarm
- pwm[1-4] Fan target duty cycle (0..255)
- pwm[1-4]_enable 0: Full-speed
- 1: Manual PWM control
- 2: Automatic PWM (tach-feedback RPM fan-control)
- 3: Automatic closed-loop (temp-feedback fan-control)
- temp[1-11]_crit Critical high temperature
- temp[1-11]_crit_alarm Chip temperature critical high alarm
- temp[1-11]_input Measured temperature
- temp[1-11]_max Maximum temperature
- temp[1-11]_max_alarm Chip temperature high alarm
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