1 Kernel driver max31785 1 Kernel driver max31785
2 ====================== 2 ======================
3 3
4 Supported chips: 4 Supported chips:
5 5
6 * Maxim MAX31785, MAX31785A 6 * Maxim MAX31785, MAX31785A
7 7
8 Prefix: 'max31785' or 'max31785a' 8 Prefix: 'max31785' or 'max31785a'
9 9
10 Addresses scanned: - 10 Addresses scanned: -
11 11
12 Datasheet: https://datasheets.maximintegra 12 Datasheet: https://datasheets.maximintegrated.com/en/ds/MAX31785.pdf
13 13
14 Author: Andrew Jeffery <andrew@aj.id.au> 14 Author: Andrew Jeffery <andrew@aj.id.au>
15 15
16 Description 16 Description
17 ----------- 17 -----------
18 18
19 The Maxim MAX31785 is a PMBus device providing 19 The Maxim MAX31785 is a PMBus device providing closed-loop, multi-channel fan
20 management with temperature and remote voltage 20 management with temperature and remote voltage sensing. Various fan control
21 features are provided, including PWM frequency 21 features are provided, including PWM frequency control, temperature hysteresis,
22 dual tachometer measurements, and fan health m 22 dual tachometer measurements, and fan health monitoring.
23 23
24 For dual-rotor configurations the MAX31785A ex 24 For dual-rotor configurations the MAX31785A exposes the second rotor tachometer
25 readings in attributes fan[5-8]_input. By cont 25 readings in attributes fan[5-8]_input. By contrast the MAX31785 only exposes
26 the slowest rotor measurement, and does so in 26 the slowest rotor measurement, and does so in the fan[1-4]_input attributes.
27 27
28 Usage Notes 28 Usage Notes
29 ----------- 29 -----------
30 30
31 This driver does not probe for PMBus devices. 31 This driver does not probe for PMBus devices. You will have to instantiate
32 devices explicitly. 32 devices explicitly.
33 33
34 Sysfs attributes 34 Sysfs attributes
35 ---------------- 35 ----------------
36 36
37 ======================= ====================== 37 ======================= =======================================================
38 fan[1-4]_alarm Fan alarm. 38 fan[1-4]_alarm Fan alarm.
39 fan[1-4]_fault Fan fault. 39 fan[1-4]_fault Fan fault.
40 fan[1-8]_input Fan RPM. On the MAX317 40 fan[1-8]_input Fan RPM. On the MAX31785A, inputs 5-8 correspond to the
41 second rotor of fans 1 41 second rotor of fans 1-4
42 fan[1-4]_target Fan input target 42 fan[1-4]_target Fan input target
43 43
44 in[1-6]_crit Critical maximum outpu 44 in[1-6]_crit Critical maximum output voltage
45 in[1-6]_crit_alarm Output voltage critica 45 in[1-6]_crit_alarm Output voltage critical high alarm
46 in[1-6]_input Measured output voltag 46 in[1-6]_input Measured output voltage
47 in[1-6]_label "vout[18-23]" 47 in[1-6]_label "vout[18-23]"
48 in[1-6]_lcrit Critical minimum outpu 48 in[1-6]_lcrit Critical minimum output voltage
49 in[1-6]_lcrit_alarm Output voltage critica 49 in[1-6]_lcrit_alarm Output voltage critical low alarm
50 in[1-6]_max Maximum output voltage 50 in[1-6]_max Maximum output voltage
51 in[1-6]_max_alarm Output voltage high al 51 in[1-6]_max_alarm Output voltage high alarm
52 in[1-6]_min Minimum output voltage 52 in[1-6]_min Minimum output voltage
53 in[1-6]_min_alarm Output voltage low ala 53 in[1-6]_min_alarm Output voltage low alarm
54 54
55 pwm[1-4] Fan target duty cycle 55 pwm[1-4] Fan target duty cycle (0..255)
56 pwm[1-4]_enable 0: Full-speed 56 pwm[1-4]_enable 0: Full-speed
57 1: Manual PWM control 57 1: Manual PWM control
58 2: Automatic PWM (tach 58 2: Automatic PWM (tach-feedback RPM fan-control)
59 3: Automatic closed-lo 59 3: Automatic closed-loop (temp-feedback fan-control)
60 60
61 temp[1-11]_crit Critical high temperat 61 temp[1-11]_crit Critical high temperature
62 temp[1-11]_crit_alarm Chip temperature criti 62 temp[1-11]_crit_alarm Chip temperature critical high alarm
63 temp[1-11]_input Measured temperature 63 temp[1-11]_input Measured temperature
64 temp[1-11]_max Maximum temperature 64 temp[1-11]_max Maximum temperature
65 temp[1-11]_max_alarm Chip temperature high 65 temp[1-11]_max_alarm Chip temperature high alarm
66 ======================= ====================== 66 ======================= =======================================================
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