| Kernel driver max31785 | |
| ====================== | |
| Supported chips: | |
| * Maxim MAX31785, MAX31785A | |
| Prefix: 'max31785' or 'max31785a' | |
| Addresses scanned: - | |
| Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/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 | |
| ======================= ======================================================= |