Based on kernel version 4.16.1. Page generated on 2018-04-09 11:53 EST.
1 Kernel driver thmc50 2 ===================== 3 4 Supported chips: 5 * Analog Devices ADM1022 6 Prefix: 'adm1022' 7 Addresses scanned: I2C 0x2c - 0x2e 8 Datasheet: http://www.analog.com/en/prod/0,2877,ADM1022,00.html 9 * Texas Instruments THMC50 10 Prefix: 'thmc50' 11 Addresses scanned: I2C 0x2c - 0x2e 12 Datasheet: http://www.ti.com/ 13 14 Author: Krzysztof Helt <krzysztof.h1@wp.pl> 15 16 This driver was derived from the 2.4 kernel thmc50.c source file. 17 18 Credits: 19 thmc50.c (2.4 kernel): 20 Frodo Looijaard <frodol@dds.nl> 21 Philip Edelbrock <phil@netroedge.com> 22 23 Module Parameters 24 ----------------- 25 26 * adm1022_temp3: short array 27 List of adapter,address pairs to force chips into ADM1022 mode with 28 second remote temperature. This does not work for original THMC50 chips. 29 30 Description 31 ----------- 32 33 The THMC50 implements: an internal temperature sensor, support for an 34 external diode-type temperature sensor (compatible w/ the diode sensor inside 35 many processors), and a controllable fan/analog_out DAC. For the temperature 36 sensors, limits can be set through the appropriate Overtemperature Shutdown 37 register and Hysteresis register. Each value can be set and read to half-degree 38 accuracy. An alarm is issued (usually to a connected LM78) when the 39 temperature gets higher then the Overtemperature Shutdown value; it stays on 40 until the temperature falls below the Hysteresis value. All temperatures are in 41 degrees Celsius, and are guaranteed within a range of -55 to +125 degrees. 42 43 The THMC50 only updates its values each 1.5 seconds; reading it more often 44 will do no harm, but will return 'old' values. 45 46 The THMC50 is usually used in combination with LM78-like chips, to measure 47 the temperature of the processor(s). 48 49 The ADM1022 works the same as THMC50 but it is faster (5 Hz instead of 50 1 Hz for THMC50). It can be also put in a new mode to handle additional 51 remote temperature sensor. The driver use the mode set by BIOS by default. 52 53 In case the BIOS is broken and the mode is set incorrectly, you can force 54 the mode with additional remote temperature with adm1022_temp3 parameter. 55 A typical symptom of wrong setting is a fan forced to full speed. 56 57 Driver Features 58 --------------- 59 60 The driver provides up to three temperatures: 61 62 temp1 -- internal 63 temp2 -- remote 64 temp3 -- 2nd remote only for ADM1022 65 66 pwm1 -- fan speed (0 = stop, 255 = full) 67 pwm1_mode -- always 0 (DC mode) 68 69 The value of 0 for pwm1 also forces FAN_OFF signal from the chip, 70 so it stops fans even if the value 0 into the ANALOG_OUT register does not. 71 72 The driver was tested on Compaq AP550 with two ADM1022 chips (one works 73 in the temp3 mode), five temperature readings and two fans.