1 .. SPDX-License-Identifier: GPL-2.0-or-later
2
3 Kernel driver max31760
4 ======================
5
6 Supported chips:
7 * Analog Devices MAX31760
8
9 Prefix: 'max31760'
10
11 Addresses scanned: none
12
13 Datasheet: https://datasheets.maximintegra
14
15
16 Author: Ibrahim Tilki <Ibrahim.Tilki@analog.com
17
18 Description
19 -----------
20
21 The MAX31760 integrates temperature sensing al
22 control. It accurately measures its local die
23 temperature of a discrete diode-connected tran
24 or a thermal diode commonly found on CPUs, gra
25 and other ASICs. Multiple temperature threshol
26 high/overtemperature (OT) and remote high/over
27 I2C-compatible interface. Fan speed is control
28 reading as an index to a 48-byte lookup table
29 user-programmed PWM values. The flexible LUT-b
30 the user to program a smooth nonlinear fan spe
31 function to minimize acoustic fan noise. Two t
32 measuring the speeds of two fans independently
33 OT threshold is exceeded, the SHDN pin is asse
34 shut down the system. A dedicated ALERT pin re
35 remote high-temperature threshold has been exc
36
37 Temperature measurement range: from -55°C to
38
39 Temperature Resolution: 11 Bits, ±0.125°C
40
41 Please refer how to instantiate this driver: D
42
43 Lookup table for auto fan control
44 ---------------------------------
45
46 ========= =================================
47 LUT Index Name
48 ========= =================================
49 1 PWM value for T < +18°C
50 2 PWM value for +18°C ≤ T < +20°C
51 3 PWM value for +20°C ≤ T < +22°C
52 ... ...
53 47 PWM value for +108°C ≤ T < +110°
54 48 PWM value for T ≥ +110°C
55 ========= =================================
56
57 Sysfs entries
58 -------------
59
60 =============================== ==============
61 fan[1-2]_input Fan speed (in
62 fan[1-2]_enable Enable fan rea
63 fan[1-2]_fault Fan fault stat
64 temp[1-2]_label "Remote" and "
65 temp[1-2]_input Temperature se
66 temp1_fault Remote tempera
67 temp[1-2]_max Temperature ma
68 temp[1-2]_max_alarm Temperature ma
69 temp[1-2]_crit Temperature cr
70 temp[1-2]_crit_alarm Temperature cr
71 pwm1 PWM value for
72 pwm1_enable 1: direct fan
73 pwm1_freq PWM frequency
74 pwm1_auto_channels_temp Temperature so
75 pwm1_auto_point[1-48]_pwm PWM value for
76 pwm1_auto_point_temp_hyst Temperature hy
77 =============================== ==============
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