mirror of
https://github.com/lm-sensors/lm-sensors.git
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Mark D. Studebaker
0086b4d99e
git-svn-id: http://lm-sensors.org/svn/lm-sensors/trunk@746 7894878c-1315-0410-8ee3-d5d059ff63e0
152 lines
7.8 KiB
Plaintext
152 lines
7.8 KiB
Plaintext
Kernel driver `lm80.o'
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======================
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Status: Complete and tested
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Supported chips:
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* National Semiconductors LM80
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Prefix `lm80'
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Addresses scanned: I2C 0x20 - 0x2f (inclusive)
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Author: Frodo Looijaard <frodol@dds.nl> and Philip Edelbrock
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<phil@netroedge.com>
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Module Parameters
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-----------------
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* force: short array (min = 1, max = 48)
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List of adapter,address pairs to boldly assume to be present
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* force_lm80: short array (min = 1, max = 48)
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List of adapter,address pairs which are unquestionably assumed to contain
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a `lm80' chip
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* ignore: short array (min = 1, max = 48)
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List of adapter,address pairs not to scan
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* ignore_range: short array (min = 1, max = 48)
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List of adapter,start-addr,end-addr triples not to scan
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* probe: short array (min = 1, max = 48)
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List of adapter,address pairs to scan additionally
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* probe_range: short array (min = 1, max = 48)
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List of adapter,start-addr,end-addr triples to scan additionally
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Description
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-----------
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This driver implements support for the National Semiconductors LM80.
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It is descibed as a `Serial Interface ACPI-Compatible Microprocessor
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System Hardware Monitor'.
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The LM80 implements one temperature sensor, two FAN rotation speed sensors,
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seven voltage sensors, alarms, and some miscellaneous stuff.
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Temperatures are measured in degrees Celcius. There are two sets of limits
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which operate independently. When the HOT Temperature Limit is crossed,
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this will cause an alarm that will be reasserted until the temperature
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drops below the HOT Hysteresis. The Overtemperature Shotdown (OS) limits
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should work in the same way (but this must be checked; the datasheet
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is unclear about this). Measurements are guaranteed between -55 and
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+125 degrees. The current temperature measurement has a resolution of
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0.0625 degrees; the limits have a resolution of 1 degree.
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FAN rotation speeds are reported in RPM (rotations per minute). An alarm is
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triggered if the rotation speed has dropped below a programmable limit. FAN
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readings can be divided by a programmable divider (1, 2, 4 or 8) to give
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the readings more range or accuracy. This is important because some FANs
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report only one 'tick' each rotation, while others report two - making
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all readings twice as high. Not all RPM values can accurately be represented,
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so some rounding is done. With a divider of 2, the lowest representable
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value is around 2600 RPM.
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Voltage ensors (also known as IN sensors) report their values in volts.
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An alarm is triggered if the voltage has crossed a programmable minimum
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or maximum limit. Note that minimum in this case always means 'closest to
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zero'; this is important for negative voltage measurements. All voltage
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inputs can measure voltages between 0 and 2.55 volts, with a resolution
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of 0.01 volt.
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If an alarm triggers, it will remain triggered until the hardware register
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is read at least once. This means that the cause for the alarm may
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already have disappeared! Note that in the current implementation, all
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hardware registers are read whenever any data is read (unless it is less
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than 2.0 seconds since the last update). This means that you can easily
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miss once-only alarms.
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The LM80 only updates its values each 1.5 seconds; reading it more often
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will do no harm, but will return 'old' values.
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Chip Features
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-------------
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Chip `lm80'
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LABEL LABEL CLASS COMPUTE CLASS ACCESS MAGNITUDE
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in0 NONE NONE R 2
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in1 NONE NONE R 2
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in2 NONE NONE R 2
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in3 NONE NONE R 2
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in4 NONE NONE R 2
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in5 NONE NONE R 2
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in6 NONE NONE R 2
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in0_min in0 in0 RW 2
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in1_min in1 in1 RW 2
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in2_min in2 in2 RW 2
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in3_min in3 in3 RW 2
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in4_min in4 in4 RW 2
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in5_min in5 in5 RW 2
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in6_min in6 in6 RW 2
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in0_max in0 in0 RW 2
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in1_max in1 in1 RW 2
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in2_max in2 in2 RW 2
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in3_max in3 in3 RW 2
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in4_max in4 in4 RW 2
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in5_max in5 in5 RW 2
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in6_max in6 in6 RW 2
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fan1 NONE NONE R 0
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fan2 NONE NONE R 0
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fan1_min fan1 NONE RW 0
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fan2_min fan2 NONE RW 0
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temp NONE NONE R 2
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temp_hot_hyst temp temp RW 2
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temp_hot_max temp temp RW 2
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temp_os_hyst temp temp RW 2
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temp_os_max temp temp RW 2
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fan1_div fan1 NONE RW 0
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fan2_div fan2 NONE RW 0
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alarms NONE NONE R 0
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LABEL FEATURE SYMBOL SYSCTL FILE:OFFSET
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in0 SENSORS_LM80_IN0 in0:3
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in1 SENSORS_LM80_IN1 in1:3
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in2 SENSORS_LM80_IN2 in2:3
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in3 SENSORS_LM80_IN3 in3:3
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in4 SENSORS_LM80_IN4 in4:3
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in5 SENSORS_LM80_IN5 in5:3
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in6 SENSORS_LM80_IN6 in6:3
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in0_min SENSORS_LM80_IN0_MIN in0:1
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in1_min SENSORS_LM80_IN1_MIN in1:1
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in2_min SENSORS_LM80_IN2_MIN in2:1
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in3_min SENSORS_LM80_IN3_MIN in3:1
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in4_min SENSORS_LM80_IN4_MIN in4:1
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in5_min SENSORS_LM80_IN5_MIN in5:1
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in6_min SENSORS_LM80_IN6_MIN in6:1
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in0_max SENSORS_LM80_IN0_MAX in0:2
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in1_max SENSORS_LM80_IN1_MAX in1:2
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in2_max SENSORS_LM80_IN2_MAX in2:2
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in3_max SENSORS_LM80_IN3_MAX in3:2
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in4_max SENSORS_LM80_IN4_MAX in4:2
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in5_max SENSORS_LM80_IN5_MAX in5:2
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in6_max SENSORS_LM80_IN6_MAX in6:2
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fan1 SENSORS_LM80_FAN1 fan1:2
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fan2 SENSORS_LM80_FAN2 fan2:2
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fan1_min SENSORS_LM80_FAN1_MIN fan1:1
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fan2_min SENSORS_LM80_FAN2_MIN fan2:1
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temp SENSORS_LM80_TEMP temp:5
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temp_hot_hyst SENSORS_LM80_TEMP_HOT_HYST temp:2
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temp_hot_max SENSORS_LM80_TEMP_HOT_MAX temp:1
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temp_os_hyst SENSORS_LM80_TEMP_OS_HYST temp:4
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temp_os_max SENSORS_LM80_TEMP_OS_MAX temp:3
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fan1_div SENSORS_LM80_FAN1_DIV fan_div:1
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fan2_div SENSORS_LM80_FAN2_DIV fan_div:2
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alarms SENSORS_LM80_ALARMS alarms:1
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