| Andrew Jeffery | 4d420a6 | 2017-11-03 15:53:02 +1100 | [diff] [blame] | 1 | Kernel driver max31785 |
| 2 | ====================== |
| 3 | |
| 4 | Supported chips: |
| 5 | * Maxim MAX31785, MAX31785A |
| 6 | Prefix: 'max31785' or 'max31785a' |
| 7 | Addresses scanned: - |
| 8 | Datasheet: https://datasheets.maximintegrated.com/en/ds/MAX31785.pdf |
| 9 | |
| 10 | Author: Andrew Jeffery <andrew@aj.id.au> |
| 11 | |
| 12 | Description |
| 13 | ----------- |
| 14 | |
| 15 | The Maxim MAX31785 is a PMBus device providing closed-loop, multi-channel fan |
| 16 | management with temperature and remote voltage sensing. Various fan control |
| 17 | features are provided, including PWM frequency control, temperature hysteresis, |
| 18 | dual tachometer measurements, and fan health monitoring. |
| 19 | |
| 20 | For dual rotor fan configuration, the MAX31785 exposes the slowest rotor of the |
| 21 | two in the fan[1-4]_input attributes. |
| 22 | |
| 23 | Usage Notes |
| 24 | ----------- |
| 25 | |
| 26 | This driver does not probe for PMBus devices. You will have to instantiate |
| 27 | devices explicitly. |
| 28 | |
| 29 | Sysfs attributes |
| 30 | ---------------- |
| 31 | |
| 32 | fan[1-4]_alarm Fan alarm. |
| 33 | fan[1-4]_fault Fan fault. |
| 34 | fan[1-4]_input Fan RPM. |
| Andrew Jeffery | 56ad86b | 2017-11-20 15:12:04 +1030 | [diff] [blame^] | 35 | fan[1-4]_target Fan input target |
| Andrew Jeffery | 4d420a6 | 2017-11-03 15:53:02 +1100 | [diff] [blame] | 36 | |
| 37 | in[1-6]_crit Critical maximum output voltage |
| 38 | in[1-6]_crit_alarm Output voltage critical high alarm |
| 39 | in[1-6]_input Measured output voltage |
| 40 | in[1-6]_label "vout[18-23]" |
| 41 | in[1-6]_lcrit Critical minimum output voltage |
| 42 | in[1-6]_lcrit_alarm Output voltage critical low alarm |
| 43 | in[1-6]_max Maximum output voltage |
| 44 | in[1-6]_max_alarm Output voltage high alarm |
| 45 | in[1-6]_min Minimum output voltage |
| 46 | in[1-6]_min_alarm Output voltage low alarm |
| 47 | |
| Andrew Jeffery | 56ad86b | 2017-11-20 15:12:04 +1030 | [diff] [blame^] | 48 | pwm[1-4] Fan target duty cycle (0..255) |
| 49 | pwm[1-4]_enable 0: Full-speed |
| 50 | 1: Manual PWM control |
| 51 | 2: Automatic PWM (tach-feedback RPM fan-control) |
| 52 | 3: Automatic closed-loop (temp-feedback fan-control) |
| 53 | |
| Andrew Jeffery | 4d420a6 | 2017-11-03 15:53:02 +1100 | [diff] [blame] | 54 | temp[1-11]_crit Critical high temperature |
| 55 | temp[1-11]_crit_alarm Chip temperature critical high alarm |
| 56 | temp[1-11]_input Measured temperature |
| 57 | temp[1-11]_max Maximum temperature |
| 58 | temp[1-11]_max_alarm Chip temperature high alarm |