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- Kernel driver thmc50
- =====================
- Supported chips:
- * Analog Devices ADM1022
- Prefix: 'adm1022'
- Addresses scanned: I2C 0x2c - 0x2e
- Datasheet: http://www.analog.com/en/prod/0,2877,ADM1022,00.html
- * Texas Instruments THMC50
- Prefix: 'thmc50'
- Addresses scanned: I2C 0x2c - 0x2e
- Datasheet: http://www.ti.com/
- Author: Krzysztof Helt <krzysztof.h1@wp.pl>
- This driver was derived from the 2.4 kernel thmc50.c source file.
- Credits:
- thmc50.c (2.4 kernel):
- Frodo Looijaard <frodol@dds.nl>
- Philip Edelbrock <phil@netroedge.com>
- 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.
- Description
- -----------
- 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.
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