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Documentation for the lm83 driver.
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Kernel driver `lm83.o'
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=====================
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Status: Incomplete and untested
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Supported chips:
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* National Semiconductor LM83
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Prefix: `lm83'
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Addresses scanned: I2C 0x18 - 0x1a, 0x29 - 0x2b, 0x4c - 0x4e (inclusive)
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Datasheet: Publicly available at the National Semiconductor website
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http://www.national.com/pf/LM/LM83.html
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Author: Jean Delvare <khali@linux-fr.org>
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License: GPL
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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_lm83: 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 `lm83' chip
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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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* 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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Description
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-----------
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The LM83 is a digital temperature sensor. It senses its own temperature as
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well as the temperature of up to three external diodes. It is compatible
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with many other devices such as the LM84 and all other ADM1021 clones.
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The main difference between the LM83 and the LM84 in that the later can
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only sense the temperature of one external diode.
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Using the adm1021 driver for a LM83 should work, but only two temperatures
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will be reported instead of four.
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Alarms and critical temperature (common to all four temperature readings)
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are not handled by this driver yet, but should be someday.
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The LM83 is only found on a handful of motherboards. An unconfirmed list
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follows. If you can confirm or infirm the fact that any of these
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motherboards do actually have an LM83, please contact us.
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Gigabyte GA-7VAX
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Gigabyte GA-7VRXP (rev 2.0)
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Gigabyte GA-8IK1100
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Iwill MPX2
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Soltek SL-75DRV5
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Note that the driver is untested so far. We really want testers! If you
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want to help, please contact us.
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The fact that the LM83 is only scarcely used can be easily explained.
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Most motherboards come with more than just temperature sensors for
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health monitoring. They also have voltage and fan rotation speed
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sensors. This means that temperature-only chips are usually used as
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secondary chips coupled with another chip such as an IT87 or similar
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chip, which provides more features. Since systems usually need three
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temperature sensors (motherboard, processor, power supply) and primary
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chips provide some temperature sensors, the secondary chip, if needed,
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won't have to handle more than two temperatures. Thus, ADM1021 clones
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are sufficent, and there is no need for a four temperatures sensor
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chip such as the LM83. The only case where using an LM83 would make
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sense is on SMP systems, such as the above-mentioned Iwill MPX2,
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because you want an additional temperature sensor for each additional
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CPU.
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All temperature values are given in degrees Celcius. Local temperature
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is given within a range of 0 to +85 degrees. Remote temperatures are
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given within a range of 0 to +125 degrees. Resolution is 1.0 degree,
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accuracy is guaranteed to 3.0 degrees (see the datasheet for more
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details).
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Each sensor has its own high limit. There is no hysteresis mechanism as
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found on most recent temperature sensors.
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Chip Features
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-------------
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Chip 'lm83'
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LABEL LABEL CLASS COMPUTE CLASS MODE MAGN
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local_temp - - R- 0
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local_temp_high local_temp local_temp RW 0
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remote1_temp - - R- 0
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remote1_temp_high remote1_temp remote1_temp RW 0
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remote2_temp - - R- 0
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remote2_temp_high remote2_temp remote2_temp RW 0
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remote3_temp - - R- 0
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remote3_temp_high remote3_temp remote3_temp RW 0
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LABEL FEATURE SYMBOL SYSCTL FILE:N
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local_temp SENSORS_LM83_LOCAL_TEMP temp1:2
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local_temp_high SENSORS_LM83_LOCAL_HIGH temp1:1
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remote1_temp SENSORS_LM83_REMOTE1_TEMP temp2:2
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remote1_temp_high SENSORS_LM83_REMOTE1_HIGH temp2:1
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remote2_temp SENSORS_LM83_REMOTE2_TEMP temp3:2
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remote2_temp_high SENSORS_LM83_REMOTE2_HIGH temp3:1
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remote3_temp SENSORS_LM83_REMOTE3_TEMP temp4:2
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remote3_temp_high SENSORS_LM83_REMOTE3_HIGH temp4:1
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