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-Kernel driver thmc50
-Supported chips:
- * Analog Devices ADM1022
- Prefix: 'adm1022'
- Addresses scanned: I2C 0x2c - 0x2e
- Datasheet:,2877,ADM1022,00.html
- * Texas Instruments THMC50
- Prefix: 'thmc50'
- Addresses scanned: I2C 0x2c - 0x2e
- Datasheet:
-Author: Krzysztof Helt <>
-This driver was derived from the 2.4 kernel thmc50.c source file.
- thmc50.c (2.4 kernel):
- Frodo Looijaard <>
- Philip Edelbrock <>
-Module Parameters
-* adm1022_temp3: short array
- List of adapter,address pairs to force chips into ADM1022 mode with
- second remote temperature. This does not work for original THMC50 chips.
-The THMC50 implements: an internal temperature sensor, support for an
-external diode-type temperature sensor (compatible w/ the diode sensor inside
-many processors), and a controllable fan/analog_out DAC. For the temperature
-sensors, limits can be set through the appropriate Overtemperature Shutdown
-register and Hysteresis register. Each value can be set and read to half-degree
-accuracy. An alarm is issued (usually to a connected LM78) when the
-temperature gets higher then the Overtemperature Shutdown value; it stays on
-until the temperature falls below the Hysteresis value. All temperatures are in
-degrees Celsius, and are guaranteed within a range of -55 to +125 degrees.
-The THMC50 only updates its values each 1.5 seconds; reading it more often
-will do no harm, but will return 'old' values.
-The THMC50 is usually used in combination with LM78-like chips, to measure
-the temperature of the processor(s).
-The ADM1022 works the same as THMC50 but it is faster (5 Hz instead of
-1 Hz for THMC50). It can be also put in a new mode to handle additional
-remote temperature sensor. The driver use the mode set by BIOS by default.
-In case the BIOS is broken and the mode is set incorrectly, you can force
-the mode with additional remote temperature with adm1022_temp3 parameter.
-A typical symptom of wrong setting is a fan forced to full speed.
-Driver Features
-The driver provides up to three temperatures:
-temp1 -- internal
-temp2 -- remote
-temp3 -- 2nd remote only for ADM1022
-pwm1 -- fan speed (0 = stop, 255 = full)
-pwm1_mode -- always 0 (DC mode)
-The value of 0 for pwm1 also forces FAN_OFF signal from the chip,
-so it stops fans even if the value 0 into the ANALOG_OUT register does not.
-The driver was tested on Compaq AP550 with two ADM1022 chips (one works
-in the temp3 mode), five temperature readings and two fans.