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-Kernel driver lm90
-==================
-
-Supported chips:
- * National Semiconductor LM90
- Prefix: 'lm90'
- Addresses scanned: I2C 0x4c
- Datasheet: Publicly available at the National Semiconductor website
- http://www.national.com/pf/LM/LM90.html
- * National Semiconductor LM89
- Prefix: 'lm99'
- Addresses scanned: I2C 0x4c and 0x4d
- Datasheet: Publicly available at the National Semiconductor website
- http://www.national.com/pf/LM/LM89.html
- * National Semiconductor LM99
- Prefix: 'lm99'
- Addresses scanned: I2C 0x4c and 0x4d
- Datasheet: Publicly available at the National Semiconductor website
- http://www.national.com/pf/LM/LM99.html
- * National Semiconductor LM86
- Prefix: 'lm86'
- Addresses scanned: I2C 0x4c
- Datasheet: Publicly available at the National Semiconductor website
- http://www.national.com/pf/LM/LM86.html
- * Analog Devices ADM1032
- Prefix: 'adm1032'
- Addresses scanned: I2C 0x4c
- Datasheet: Publicly available at the Analog Devices website
- http://products.analog.com/products/info.asp?product=ADM1032
- * Analog Devices ADT7461
- Prefix: 'adt7461'
- Addresses scanned: I2C 0x4c
- Datasheet: Publicly available at the Analog Devices website
- http://products.analog.com/products/info.asp?product=ADT7461
- Note: Only if in ADM1032 compatibility mode
- * Maxim MAX6657
- Prefix: 'max6657'
- Addresses scanned: I2C 0x4c
- Datasheet: Publicly available at the Maxim website
- http://www.maxim-ic.com/quick_view2.cfm/qv_pk/2578
- * Maxim MAX6658
- Prefix: 'max6657'
- Addresses scanned: I2C 0x4c
- Datasheet: Publicly available at the Maxim website
- http://www.maxim-ic.com/quick_view2.cfm/qv_pk/2578
- * Maxim MAX6659
- Prefix: 'max6657'
- Addresses scanned: I2C 0x4c, 0x4d (unsupported 0x4e)
- Datasheet: Publicly available at the Maxim website
- http://www.maxim-ic.com/quick_view2.cfm/qv_pk/2578
-
-
-Author: Jean Delvare <khali@linux-fr.org>
-
-
-Description
------------
-
-The LM90 is a digital temperature sensor. It senses its own temperature as
-well as the temperature of up to one external diode. It is compatible
-with many other devices such as the LM86, the LM89, the LM99, the ADM1032,
-the MAX6657, MAX6658 and the MAX6659 all of which are supported by this driver.
-Note that there is no easy way to differentiate between the last three
-variants. The extra address and features of the MAX6659 are not supported by
-this driver. Additionally, the ADT7461 is supported if found in ADM1032
-compatibility mode.
-
-The specificity of this family of chipsets over the ADM1021/LM84
-family is that it features critical limits with hysteresis, and an
-increased resolution of the remote temperature measurement.
-
-The different chipsets of the family are not strictly identical, although
-very similar. This driver doesn't handle any specific feature for now,
-but could if there ever was a need for it. For reference, here comes a
-non-exhaustive list of specific features:
-
-LM90:
- * Filter and alert configuration register at 0xBF.
- * ALERT is triggered by temperatures over critical limits.
-
-LM86 and LM89:
- * Same as LM90
- * Better external channel accuracy
-
-LM99:
- * Same as LM89
- * External temperature shifted by 16 degrees down
-
-ADM1032:
- * Consecutive alert register at 0x22.
- * Conversion averaging.
- * Up to 64 conversions/s.
- * ALERT is triggered by open remote sensor.
-
-ADT7461
- * Extended temperature range (breaks compatibility)
- * Lower resolution for remote temperature
-
-MAX6657 and MAX6658:
- * Remote sensor type selection
-
-MAX6659
- * Selectable address
- * Second critical temperature limit
- * Remote sensor type selection
-
-All temperature values are given in degrees Celsius. Resolution
-is 1.0 degree for the local temperature, 0.125 degree for the remote
-temperature.
-
-Each sensor has its own high and low limits, plus a critical limit.
-Additionally, there is a relative hysteresis value common to both critical
-values. To make life easier to user-space applications, two absolute values
-are exported, one for each channel, but these values are of course linked.
-Only the local hysteresis can be set from user-space, and the same delta
-applies to the remote hysteresis.
-
-The lm90 driver will not update its values more frequently than every
-other second; reading them more often will do no harm, but will return
-'old' values.
-
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