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-Kernel driver lm87
-Supported chips:
- * National Semiconductor LM87
- Prefix: 'lm87'
- Addresses scanned: I2C 0x2c - 0x2e
- Datasheet:
- * Analog Devices ADM1024
- Prefix: 'adm1024'
- Addresses scanned: I2C 0x2c - 0x2e
- Datasheet:,2877,ADM1024,00.html
- Frodo Looijaard <>,
- Philip Edelbrock <>,
- Mark Studebaker <>,
- Stephen Rousset <>,
- Dan Eaton <>,
- Jean Delvare <>,
- Original 2.6 port Jeff Oliver
-This driver implements support for the National Semiconductor LM87
-and the Analog Devices ADM1024.
-The LM87 implements up to three temperature sensors, up to two fan
-rotation speed sensors, up to seven voltage sensors, alarms, and some
-miscellaneous stuff. The ADM1024 is fully compatible.
-Temperatures are measured in degrees Celsius. Each input has a high
-and low alarm settings. A high limit produces an alarm when the value
-goes above it, and an alarm is also produced when the value goes below
-the low limit.
-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.
-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 1.0 seconds since the last update). This means that you can easily
-miss once-only alarms.
-The lm87 driver only updates its values each 1.0 seconds; reading it more
-often will do no harm, but will return 'old' values.
-Hardware Configurations
-The LM87 has four pins which can serve one of two possible functions,
-depending on the hardware configuration.
-Some functions share pins, so not all functions are available at the same
-time. Which are depends on the hardware setup. This driver normally
-assumes that firmware configured the chip correctly. Where this is not
-the case, platform code must set the I2C client's platform_data to point
-to a u8 value to be written to the channel register.
-For reference, here is the list of exclusive functions:
- - in0+in5 (default) or temp3
- - fan1 (default) or in6
- - fan2 (default) or in7
- - VID lines (default) or IRQ lines (not handled by this driver)