1 Kernel driver lm63
2 ==================
3
4 Supported chips:
5
6 * National Semiconductor LM63
7
8 Prefix: 'lm63'
9
10 Addresses scanned: I2C 0x4c
11
12 Datasheet: Publicly available at the Natio
13
14 http://www.national.com/pf/LM/L
15
16 * National Semiconductor LM64
17
18 Prefix: 'lm64'
19
20 Addresses scanned: I2C 0x18 and 0x4e
21
22 Datasheet: Publicly available at the Natio
23
24 http://www.national.com/pf/LM/L
25
26 * National Semiconductor LM96163
27
28 Prefix: 'lm96163'
29
30 Addresses scanned: I2C 0x4c
31
32 Datasheet: Publicly available at the Natio
33
34 http://www.national.com/pf/LM/L
35
36
37 Author: Jean Delvare <jdelvare@suse.de>
38
39 Thanks go to Tyan and especially Alex Buckingh
40 access to their S4882 test platform for this d
41
42 https://www.tyan.com/
43
44 Description
45 -----------
46
47 The LM63 is a digital temperature sensor with
48 and control.
49
50 The LM63 is basically an LM86 with fan speed m
51 capabilities added. It misses some of the LM86
52
53 - No low limit for local temperature.
54 - No critical limit for local temperature.
55 - Critical limit for remote temperature can b
56 will consider that the critical limit is re
57
58 The datasheet isn't very clear about what the
59
60 An explanation from National Semiconductor: Th
61 value have to be masked out. The value is stil
62
63 All temperature values are given in degrees Ce
64 degree for the local temperature, 0.125 degree
65
66 The fan speed is measured using a tachometer.
67 store the value in an 8-bit register and have
68 to make sure that the result will fit in the r
69 value for measuring the speed of the fan. It c
70 83 RPM, at least in theory.
71
72 Note that the pin used for fan monitoring is s
73 function. Depending on how the board designer
74 speed monitoring will or will not be possible.
75 is left to the BIOS, and the driver will blind
76 LM63 suffers from this limitation, the LM64 an
77 for fan monitoring and alert out. On the LM64,
78 on the LM96163 it can be disabled.
79
80 A PWM output can be used to control the speed
81 PWM modes: manual and automatic. Automatic mod
82 (you cannot define your custom PWM/temperature
83 supported either.
84
85 The lm63 driver will not update its values mor
86 the update_interval sysfs attribute; reading t
87 but will return 'old' values. Values in the au
88 (attributes pwm1_auto_*) have their own indepe
89
90 The LM64 is effectively an LM63 with GPIO line
91 support these GPIO lines at present.
92
93 The LM96163 is an enhanced version of LM63 wit
94 and better PWM resolution. For LM96163, the ex
95 configurable as CPU embedded diode(1) or 3904
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