| 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 |
| ======================= ======================================================= |
