projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 4d420a6a AJ |
1 | Kernel driver max31785 |
| 2 | ====================== | |
| 3 | ||
| 4 | Supported chips: | |
| 1f234ff1 | 5 | |
| 4d420a6a | 6 | * Maxim MAX31785, MAX31785A |
| 1f234ff1 | 7 | |
| 4d420a6a | 8 | Prefix: 'max31785' or 'max31785a' |
| 1f234ff1 | 9 | |
| 4d420a6a | 10 | Addresses scanned: - |
| 1f234ff1 | 11 | |
| 4d420a6a AJ |
12 | Datasheet: https://datasheets.maximintegrated.com/en/ds/MAX31785.pdf |
| 13 | ||
| 14 | Author: Andrew Jeffery <andrew@aj.id.au> | |
| 15 | ||
| 16 | Description | |
| 17 | ----------- | |
| 18 | ||
| 19 | The Maxim MAX31785 is a PMBus device providing closed-loop, multi-channel fan | |
| 20 | management with temperature and remote voltage sensing. Various fan control | |
| 21 | features are provided, including PWM frequency control, temperature hysteresis, | |
| 22 | dual tachometer measurements, and fan health monitoring. | |
| 23 | ||
| cf583b42 AJ |
24 | For dual-rotor configurations the MAX31785A exposes the second rotor tachometer |
| 25 | readings in attributes fan[5-8]_input. By contrast the MAX31785 only exposes | |
| 26 | the slowest rotor measurement, and does so in the fan[1-4]_input attributes. | |
| 4d420a6a AJ |
27 | |
| 28 | Usage Notes | |
| 29 | ----------- | |
| 30 | ||
| 31 | This driver does not probe for PMBus devices. You will have to instantiate | |
| 32 | devices explicitly. | |
| 33 | ||
| 34 | Sysfs attributes | |
| 35 | ---------------- | |
| 36 | ||
| 1f234ff1 | 37 | ======================= ======================================================= |
| 4d420a6a AJ |
38 | fan[1-4]_alarm Fan alarm. |
| 39 | fan[1-4]_fault Fan fault. | |
| cf583b42 AJ |
40 | fan[1-8]_input Fan RPM. On the MAX31785A, inputs 5-8 correspond to the |
| 41 | second rotor of fans 1-4 | |
| 56ad86b4 | 42 | fan[1-4]_target Fan input target |
| 4d420a6a AJ |
43 | |
| 44 | in[1-6]_crit Critical maximum output voltage | |
| 45 | in[1-6]_crit_alarm Output voltage critical high alarm | |
| 46 | in[1-6]_input Measured output voltage | |
| 47 | in[1-6]_label "vout[18-23]" | |
| 48 | in[1-6]_lcrit Critical minimum output voltage | |
| 49 | in[1-6]_lcrit_alarm Output voltage critical low alarm | |
| 50 | in[1-6]_max Maximum output voltage | |
| 51 | in[1-6]_max_alarm Output voltage high alarm | |
| 52 | in[1-6]_min Minimum output voltage | |
| 53 | in[1-6]_min_alarm Output voltage low alarm | |
| 54 | ||
| 56ad86b4 AJ |
55 | pwm[1-4] Fan target duty cycle (0..255) |
| 56 | pwm[1-4]_enable 0: Full-speed | |
| 57 | 1: Manual PWM control | |
| 58 | 2: Automatic PWM (tach-feedback RPM fan-control) | |
| 59 | 3: Automatic closed-loop (temp-feedback fan-control) | |
| 60 | ||
| 4d420a6a AJ |
61 | temp[1-11]_crit Critical high temperature |
| 62 | temp[1-11]_crit_alarm Chip temperature critical high alarm | |
| 63 | temp[1-11]_input Measured temperature | |
| 64 | temp[1-11]_max Maximum temperature | |
| 65 | temp[1-11]_max_alarm Chip temperature high alarm | |
| 1f234ff1 | 66 | ======================= ======================================================= |