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lm80

Revision 3007, 7.6 KB (checked in by khali, 5 years ago)
Backport the cleanups and corrections Rudolf Marek and I did when porting the chips documentation to Linux 2.6.
Property svn:eol-style set to `native` Property svn:keywords set to `Author Date Id Revision`

Line
1	Kernel driver `lm80.o'
2	======================
3
4	Status: Complete and tested
5
6	Supported chips:
7	* National Semiconductor LM80
8	Prefix: 'lm80'
9	Addresses scanned: I2C 0x20 - 0x2f
10
11	Author: Frodo Looijaard <frodol@dds.nl> and Philip Edelbrock
12	<phil@netroedge.com>
13
14
15	Module Parameters
16	-----------------
17
18	* force: short array (min = 1, max = 48)
19	List of adapter,address pairs to boldly assume to be present
20	* force_lm80: short array (min = 1, max = 48)
21	List of adapter,address pairs which are unquestionably assumed to contain
22	a `lm80' chip
23	* ignore: short array (min = 1, max = 48)
24	List of adapter,address pairs not to scan
25	* ignore_range: short array (min = 1, max = 48)
26	List of adapter,start-addr,end-addr triples not to scan
27	* probe: short array (min = 1, max = 48)
28	List of adapter,address pairs to scan additionally
29	* probe_range: short array (min = 1, max = 48)
30	List of adapter,start-addr,end-addr triples to scan additionally
31
32
33	Description
34	-----------
35
36	This driver implements support for the National Semiconductor LM80.
37	It is descibed as a `Serial Interface ACPI-Compatible Microprocessor
38	System Hardware Monitor'.
39
40	The LM80 implements one temperature sensor, two fan rotation speed sensors,
41	seven voltage sensors, alarms, and some miscellaneous stuff.
42
43	Temperatures are measured in degrees Celsius. There are two sets of limits
44	which operate independently. When the HOT Temperature Limit is crossed,
45	this will cause an alarm that will be reasserted until the temperature
46	drops below the HOT Hysteresis. The Overtemperature Shotdown (OS) limits
47	should work in the same way (but this must be checked; the datasheet
48	is unclear about this). Measurements are guaranteed between -55 and
49	+125 degrees. The current temperature measurement has a resolution of
50	0.0625 degrees; the limits have a resolution of 1 degree.
51
52	Fan rotation speeds are reported in RPM (rotations per minute). An alarm is
53	triggered if the rotation speed has dropped below a programmable limit. Fan
54	readings can be divided by a programmable divider (1, 2, 4 or 8) to give
55	the readings more range or accuracy. Not all RPM values can accurately be
56	represented, so some rounding is done. With a divider of 2, the lowest
57	representable value is around 2600 RPM.
58
59	Voltage ensors (also known as IN sensors) report their values in volts.
60	An alarm is triggered if the voltage has crossed a programmable minimum
61	or maximum limit. Note that minimum in this case always means 'closest to
62	zero'; this is important for negative voltage measurements. All voltage
63	inputs can measure voltages between 0 and 2.55 volts, with a resolution
64	of 0.01 volt.
65
66	If an alarm triggers, it will remain triggered until the hardware register
67	is read at least once. This means that the cause for the alarm may
68	already have disappeared! Note that in the current implementation, all
69	hardware registers are read whenever any data is read (unless it is less
70	than 2.0 seconds since the last update). This means that you can easily
71	miss once-only alarms.
72
73	The LM80 only updates its values each 1.5 seconds; reading it more often
74	will do no harm, but will return 'old' values.
75
76
77	Chip Features
78	-------------
79
80	Chip `lm80'
81	LABEL LABEL CLASS COMPUTE CLASS ACCESS MAGNITUDE
82	in0 NONE NONE R 2
83	in1 NONE NONE R 2
84	in2 NONE NONE R 2
85	in3 NONE NONE R 2
86	in4 NONE NONE R 2
87	in5 NONE NONE R 2
88	in6 NONE NONE R 2
89	in0_min in0 in0 RW 2
90	in1_min in1 in1 RW 2
91	in2_min in2 in2 RW 2
92	in3_min in3 in3 RW 2
93	in4_min in4 in4 RW 2
94	in5_min in5 in5 RW 2
95	in6_min in6 in6 RW 2
96	in0_max in0 in0 RW 2
97	in1_max in1 in1 RW 2
98	in2_max in2 in2 RW 2
99	in3_max in3 in3 RW 2
100	in4_max in4 in4 RW 2
101	in5_max in5 in5 RW 2
102	in6_max in6 in6 RW 2
103	fan1 NONE NONE R 0
104	fan2 NONE NONE R 0
105	fan1_min fan1 NONE RW 0
106	fan2_min fan2 NONE RW 0
107	temp NONE NONE R 2
108	temp_hot_hyst temp temp RW 2
109	temp_hot_max temp temp RW 2
110	temp_os_hyst temp temp RW 2
111	temp_os_max temp temp RW 2
112	fan1_div fan1 NONE RW 0
113	fan2_div fan2 NONE RW 0
114	alarms NONE NONE R 0
115
116	LABEL FEATURE SYMBOL SYSCTL FILE:OFFSET
117	in0 SENSORS_LM80_IN0 in0:3
118	in1 SENSORS_LM80_IN1 in1:3
119	in2 SENSORS_LM80_IN2 in2:3
120	in3 SENSORS_LM80_IN3 in3:3
121	in4 SENSORS_LM80_IN4 in4:3
122	in5 SENSORS_LM80_IN5 in5:3
123	in6 SENSORS_LM80_IN6 in6:3
124	in0_min SENSORS_LM80_IN0_MIN in0:1
125	in1_min SENSORS_LM80_IN1_MIN in1:1
126	in2_min SENSORS_LM80_IN2_MIN in2:1
127	in3_min SENSORS_LM80_IN3_MIN in3:1
128	in4_min SENSORS_LM80_IN4_MIN in4:1
129	in5_min SENSORS_LM80_IN5_MIN in5:1
130	in6_min SENSORS_LM80_IN6_MIN in6:1
131	in0_max SENSORS_LM80_IN0_MAX in0:2
132	in1_max SENSORS_LM80_IN1_MAX in1:2
133	in2_max SENSORS_LM80_IN2_MAX in2:2
134	in3_max SENSORS_LM80_IN3_MAX in3:2
135	in4_max SENSORS_LM80_IN4_MAX in4:2
136	in5_max SENSORS_LM80_IN5_MAX in5:2
137	in6_max SENSORS_LM80_IN6_MAX in6:2
138	fan1 SENSORS_LM80_FAN1 fan1:2
139	fan2 SENSORS_LM80_FAN2 fan2:2
140	fan1_min SENSORS_LM80_FAN1_MIN fan1:1
141	fan2_min SENSORS_LM80_FAN2_MIN fan2:1
142	temp SENSORS_LM80_TEMP temp:5
143	temp_hot_hyst SENSORS_LM80_TEMP_HOT_HYST temp:2
144	temp_hot_max SENSORS_LM80_TEMP_HOT_MAX temp:1
145	temp_os_hyst SENSORS_LM80_TEMP_OS_HYST temp:4
146	temp_os_max SENSORS_LM80_TEMP_OS_MAX temp:3
147	fan1_div SENSORS_LM80_FAN1_DIV fan_div:1
148	fan2_div SENSORS_LM80_FAN2_DIV fan_div:2
149	alarms SENSORS_LM80_ALARMS alarms:1

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