mirror of
https://github.com/lm-sensors/lm-sensors.git
synced 2026-10-18 11:09:32 +00:00
Jean Delvare
9413c3153f
git-svn-id: http://lm-sensors.org/svn/lm-sensors/trunk@2039 7894878c-1315-0410-8ee3-d5d059ff63e0
142 lines
6.5 KiB
Plaintext
142 lines
6.5 KiB
Plaintext
Kernel driver `lm90.o'
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=====================
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Status: Complete and reasonably 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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* 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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* 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 ADM1032, the
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MAX6657 and the MAX6658. Of these, only the ADM1032 is officially
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supported for now, but the others can probably be successfully forced.
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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 stricly 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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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. According to the datasheets, the ADM1032 has a better
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range and accuracy than the LM90 (but is also way more expensive).
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See the datasheets for details.
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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.
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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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Chip 'lm90'
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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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hyst - - RW 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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hyst SENSORS_LM90_TCRIT_HYST hyst:1
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alarms SENSORS_LM90_ALARMS alarms:1
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Chip 'adm1032'
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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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hyst - - RW 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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hyst SENSORS_LM90_TCRIT_HYST hyst:1
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alarms SENSORS_LM90_ALARMS alarms:1
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