mirror of
https://github.com/lm-sensors/lm-sensors.git
synced 2026-10-19 11:19:31 +00:00
Jean Delvare
635b1b06bc
git-svn-id: http://lm-sensors.org/svn/lm-sensors/trunk@2471 7894878c-1315-0410-8ee3-d5d059ff63e0
140 lines
5.8 KiB
Plaintext
140 lines
5.8 KiB
Plaintext
Kernel driver `lm90.o'
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======================
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Status: Complete and well tested
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Supported chips:
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* National Semiconductor LM90
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Prefix: `lm90'
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Addresses scanned: I2C 0x4c
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Datasheet: Publicly available at the National Semiconductor website
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http://www.national.com/pf/LM/LM90.html
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* National Semiconductor LM89
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Prefix: `lm99'
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Addresses scanned: I2C 0x4c and 0x4d
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Datasheet: Publicly available at the National Semiconductor website
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http://www.national.com/pf/LM/LM89.html
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* National Semiconductor LM99
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Prefix: `lm99'
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Addresses scanned: I2C 0x4c and 0x4d
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Datasheet: Publicly available at the National Semiconductor website
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http://www.national.com/pf/LM/LM99.html
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* Analog Devices ADM1032
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Prefix: `adm1032'
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Addresses scanned: I2C 0x4c
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Datasheet: Publicly available at the Analog Devices website
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http://products.analog.com/products/info.asp?product=ADM1032
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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_lm90: 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 `lm90' chip
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* force_adm1032: 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 `adm1032' chip
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* force_lm99: 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 `lm99' 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 LM90 is a digital temperature sensor. It senses its own temperature as
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well as the temperature of up to one external diode. It is compatible
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with many other devices such as the LM86, the LM89, the LM99, the ADM1032,
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the MAX6657 and the MAX6658. Of these, only the ADM1032, LM89 and LM99 are
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supported for now, but the others can be forced (and later added).
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The specificity of this family of chipsets over the ADM1021/LM84
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family is that it features critical limits with hysteresis, and an
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increased resolution of the remote temperature measurement.
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The different chipsets of the family are not strictly identical, although
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very similar. This driver doesn't handle any specific feature for now,
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but could if there ever was a need for it. For reference, here comes a
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non-exhaustive list of specific features:
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LM90:
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* Filter and alert configuration register at 0xBF.
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* ALERT is triggered by temperatures over critical limits.
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LM89:
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* Same as LM90
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* Better external channel accuracy
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LM99:
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* Same as LM89
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* External temperature shifted by 16 degrees down
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ADM1032:
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* Consecutive alert register at 0x22.
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* Conversion averaging.
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* Up to 64 conversions/s.
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* ALERT is triggered by open remote sensor.
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All temperature values are given in degrees Celcius. Resolution
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is 1.0 degree for the local temperature, 0.125 degree for the remote
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temperature.
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Each sensor has its own high and low limits, plus a critical limit.
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Additionally, there is a relative hysteresis value common to both critical
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values. To make life easier to user-space applications, two absolute values
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are exported, one for each channel, but these values are of course linked.
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Only the local hysteresis can be set from user-space, and the same delta
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applies to the remote hysteresis.
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The lm90 driver will not update its values more frequently than every
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other second; reading them more often will do no harm, but will return
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'old' values.
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Chip Features
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-------------
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Chips 'lm90', adm1032' and 'lm99'
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LABEL LABEL CLASS COMPUTE CLASS MODE MAGN
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temp1 - - R- 0
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temp1_high temp1 temp1 RW 0
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temp1_low temp1 temp1 RW 0
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temp2 - - R- 1
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temp2_high temp2 temp2 RW 1
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temp2_low temp2 temp2 RW 1
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tcrit1 temp1 temp1 RW 0
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tcrit2 temp2 temp2 RW 0
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hyst1 temp1 temp1 RW 0
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hyst2 temp2 temp2 R- 0
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alarms - - R- 0
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LABEL FEATURE SYMBOL SYSCTL FILE:N
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temp1 SENSORS_LM90_LOCAL_TEMP temp1:3
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temp1_high SENSORS_LM90_LOCAL_HIGH temp1:1
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temp1_low SENSORS_LM90_LOCAL_LOW temp1:2
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temp2 SENSORS_LM90_REMOTE_TEMP temp2:3
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temp2_high SENSORS_LM90_REMOTE_HIGH temp2:1
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temp2_low SENSORS_LM90_REMOTE_LOW temp2:2
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tcrit1 SENSORS_LM90_LOCAL_TCRIT tcrit1:1
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tcrit2 SENSORS_LM90_REMOTE_TCRIT tcrit2:1
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hyst1 SENSORS_LM90_LOCAL_TCRIT_HYST hyst1:1
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hyst2 SENSORS_LM90_REMOTE_TCRIT_HYST hyst2:1
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alarms SENSORS_LM90_ALARMS alarms:1
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