1 Kernel driver lm87
2 ==================
3
4 Supported chips:
5
6 * National Semiconductor LM87
7
8 Prefix: 'lm87'
9
10 Addresses scanned: I2C 0x2c - 0x2e
11
12 Datasheet: http://www.national.com/pf/LM/L
13
14 * Analog Devices ADM1024
15
16 Prefix: 'adm1024'
17
18 Addresses scanned: I2C 0x2c - 0x2e
19
20 Datasheet: https://www.analog.com/en/prod/
21
22
23 Authors:
24 - Frodo Looijaard <frodol@dds.nl>,
25 - Philip Edelbrock <phil@netroedge.com>
26 - Mark Studebaker <mdsxyz123@yahoo.com>
27 - Stephen Rousset <stephen.rousset@rock
28 - Dan Eaton <dan.eaton@rocketlogix.com>
29 - Jean Delvare <jdelvare@suse.de>,
30 - Original 2.6 port Jeff Oliver
31
32 Description
33 -----------
34
35 This driver implements support for the Nationa
36 and the Analog Devices ADM1024.
37
38 The LM87 implements up to three temperature se
39 rotation speed sensors, up to seven voltage se
40 miscellaneous stuff. The ADM1024 is fully comp
41
42 Temperatures are measured in degrees Celsius.
43 and low alarm settings. A high limit produces
44 goes above it, and an alarm is also produced w
45 the low limit.
46
47 Fan rotation speeds are reported in RPM (rotat
48 triggered if the rotation speed has dropped be
49 readings can be divided by a programmable divi
50 the readings more range or accuracy. Not all R
51 represented, so some rounding is done. With a
52 representable value is around 2600 RPM.
53
54 Voltage sensors (also known as IN sensors) rep
55 volts. An alarm is triggered if the voltage ha
56 minimum or maximum limit. Note that minimum in
57 'closest to zero'; this is important for negat
58
59 If an alarm triggers, it will remain triggered
60 is read at least once. This means that the cau
61 already have disappeared! Note that in the cur
62 hardware registers are read whenever any data
63 than 1.0 seconds since the last update). This
64 miss once-only alarms.
65
66 The lm87 driver only updates its values each 1
67 often will do no harm, but will return 'old' v
68
69
70 Hardware Configurations
71 -----------------------
72
73 The LM87 has four pins which can serve one of
74 depending on the hardware configuration.
75
76 Some functions share pins, so not all function
77 time. Which are depends on the hardware setup.
78 assumes that firmware configured the chip corr
79 the case, platform code must set the I2C clien
80 to a u8 value to be written to the channel reg
81
82 For reference, here is the list of exclusive f
83 - in0+in5 (default) or temp3
84 - fan1 (default) or in6
85 - fan2 (default) or in7
86 - VID lines (default) or IRQ lines (not handl
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