1Kernel driver w83793 2==================== 3 4Supported chips: 5 * Winbond W83793G/W83793R 6 Prefix: 'w83793' 7 Addresses scanned: I2C 0x2c - 0x2f 8 Datasheet: Still not published 9 10Authors: 11 Yuan Mu (Winbond Electronics) 12 Rudolf Marek <r.marek@assembler.cz> 13 14 15Module parameters 16----------------- 17 18* reset int 19 (default 0) 20 This parameter is not recommended, it will lose motherboard specific 21 settings. Use 'reset=1' to reset the chip when loading this module. 22 23* force_subclients=bus,caddr,saddr1,saddr2 24 This is used to force the i2c addresses for subclients of 25 a certain chip. Typical usage is `force_subclients=0,0x2f,0x4a,0x4b' 26 to force the subclients of chip 0x2f on bus 0 to i2c addresses 27 0x4a and 0x4b. 28 29 30Description 31----------- 32 33This driver implements support for Winbond W83793G/W83793R chips. 34 35* Exported features 36 This driver exports 10 voltage sensors, up to 12 fan tachometer inputs, 37 6 remote temperatures, up to 8 sets of PWM fan controls, SmartFan 38 (automatic fan speed control) on all temperature/PWM combinations, 2 39 sets of 6-pin CPU VID input. 40 41* Sensor resolutions 42 If your motherboard maker used the reference design, the resolution of 43 voltage0-2 is 2mV, resolution of voltage3/4/5 is 16mV, 8mV for voltage6, 44 24mV for voltage7/8. Temp1-4 have a 0.25 degree Celsius resolution, 45 temp5-6 have a 1 degree Celsiis resolution. 46 47* Temperature sensor types 48 Temp1-4 have 2 possible types. It can be read from (and written to) 49 temp[1-4]_type. 50 - If the value is 3, it starts monitoring using a remote termal diode 51 (default). 52 - If the value is 6, it starts monitoring using the temperature sensor 53 in Intel CPU and get result by PECI. 54 Temp5-6 can be connected to external thermistors (value of 55 temp[5-6]_type is 4). 56 57* Alarm mechanism 58 For voltage sensors, an alarm triggers if the measured value is below 59 the low voltage limit or over the high voltage limit. 60 For temperature sensors, an alarm triggers if the measured value goes 61 above the high temperature limit, and wears off only after the measured 62 value drops below the hysteresis value. 63 For fan sensors, an alarm triggers if the measured value is below the 64 low speed limit. 65 66* SmartFan/PWM control 67 If you want to set a pwm fan to manual mode, you just need to make sure it 68 is not controlled by any temp channel, for example, you want to set fan1 69 to manual mode, you need to check the value of temp[1-6]_fan_map, make 70 sure bit 0 is cleared in the 6 values. And then set the pwm1 value to 71 control the fan. 72 73 Each temperature channel can control all the 8 PWM outputs (by setting the 74 corresponding bit in tempX_fan_map), you can set the temperature channel 75 mode using temp[1-6]_pwm_enable, 2 is Thermal Cruise mode and 3 76 is the SmartFanII mode. Temperature channels will try to speed up or 77 slow down all controlled fans, this means one fan can receive different 78 PWM value requests from different temperature channels, but the chip 79 will always pick the safest (max) PWM value for each fan. 80 81 In Thermal Cruise mode, the chip attempts to keep the temperature at a 82 predefined value, within a tolerance margin. So if tempX_input > 83 thermal_cruiseX + toleranceX, the chip will increase the PWM value, 84 if tempX_input < thermal_cruiseX - toleranceX, the chip will decrease 85 the PWM value. If the temperature is within the tolerance range, the PWM 86 value is left unchanged. 87 88 SmartFanII works differently, you have to define up to 7 PWM, temperature 89 trip points, defining a PWM/temperature curve which the chip will follow. 90 While not fundamentally different from the Thermal Cruise mode, the 91 implementation is quite different, giving you a finer-grained control. 92 93* Chassis 94 If the case open alarm triggers, it will stay in this state unless cleared 95 by any write to the sysfs file "chassis". 96 97* VID and VRM 98 The VRM version is detected automatically, don't modify the it unless you 99 *do* know the cpu VRM version and it's not properly detected. 100 101 102Notes 103----- 104 105 Only Fan1-5 and PWM1-3 are guaranteed to always exist, other fan inputs and 106 PWM outputs may or may not exist depending on the chip pin configuration. 107