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