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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 | |
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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 | ||
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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. | |
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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 | ======================= ======================================================= |
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38 | fan[1-4]_alarm Fan alarm. |
39 | fan[1-4]_fault Fan fault. | |
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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 |
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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 | ||
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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 | ||
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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 | ======================= ======================================================= |