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-Kernel driver lm80
-Supported chips:
- * National Semiconductor LM80
- Prefix: 'lm80'
- Addresses scanned: I2C 0x28 - 0x2f
- Datasheet: Publicly available at the National Semiconductor website
- * National Semiconductor LM96080
- Prefix: 'lm96080'
- Addresses scanned: I2C 0x28 - 0x2f
- Datasheet: Publicly available at the National Semiconductor website
- Frodo Looijaard <>,
- Philip Edelbrock <>
-This driver implements support for the National Semiconductor LM80.
-It is described as a 'Serial Interface ACPI-Compatible Microprocessor
-System Hardware Monitor'. The LM96080 is a more recent incarnation,
-it is pin and register compatible, with a few additional features not
-yet supported by the driver.
-The LM80 implements one temperature sensor, two fan rotation speed sensors,
-seven voltage sensors, alarms, and some miscellaneous stuff.
-Temperatures are measured in degrees Celsius. There are two sets of limits
-which operate independently. When the HOT Temperature Limit is crossed,
-this will cause an alarm that will be reasserted until the temperature
-drops below the HOT Hysteresis. The Overtemperature Shutdown (OS) limits
-should work in the same way (but this must be checked; the datasheet
-is unclear about this). Measurements are guaranteed between -55 and
-+125 degrees. The current temperature measurement has a resolution of
-0.0625 degrees; the limits have a resolution of 1 degree.
-Fan rotation speeds are reported in RPM (rotations per minute). An alarm is
-triggered if the rotation speed has dropped below a programmable limit. Fan
-readings can be divided by a programmable divider (1, 2, 4 or 8) to give
-the readings more range or accuracy. Not all RPM values can accurately be
-represented, so some rounding is done. With a divider of 2, the lowest
-representable value is around 2600 RPM.
-Voltage sensors (also known as IN sensors) report their values in volts.
-An alarm is triggered if the voltage has crossed a programmable minimum
-or maximum limit. Note that minimum in this case always means 'closest to
-zero'; this is important for negative voltage measurements. All voltage
-inputs can measure voltages between 0 and 2.55 volts, with a resolution
-of 0.01 volt.
-If an alarm triggers, it will remain triggered until the hardware register
-is read at least once. This means that the cause for the alarm may
-already have disappeared! Note that in the current implementation, all
-hardware registers are read whenever any data is read (unless it is less
-than 2.0 seconds since the last update). This means that you can easily
-miss once-only alarms.
-The LM80 only updates its values each 1.5 seconds; reading it more often
-will do no harm, but will return 'old' values.