| Kernel driver w83793 |
| ==================== |
| |
| Supported chips: |
| * Winbond W83793G/W83793R |
| Prefix: 'w83793' |
| Addresses scanned: I2C 0x2c - 0x2f |
| Datasheet: Still not published |
| |
| Authors: |
| Yuan Mu (Winbond Electronics) |
| Rudolf Marek <r.marek@assembler.cz> |
| |
| |
| Module parameters |
| ----------------- |
| |
| * reset int |
| (default 0) |
| This parameter is not recommended, it will lose motherboard specific |
| settings. Use 'reset=1' to reset the chip when loading this module. |
| |
| * force_subclients=bus,caddr,saddr1,saddr2 |
| This is used to force the i2c addresses for subclients of |
| a certain chip. Typical usage is `force_subclients=0,0x2f,0x4a,0x4b' |
| to force the subclients of chip 0x2f on bus 0 to i2c addresses |
| 0x4a and 0x4b. |
| |
| |
| Description |
| ----------- |
| |
| This driver implements support for Winbond W83793G/W83793R chips. |
| |
| * Exported features |
| This driver exports 10 voltage sensors, up to 12 fan tachometer inputs, |
| 6 remote temperatures, up to 8 sets of PWM fan controls, SmartFan |
| (automatic fan speed control) on all temperature/PWM combinations, 2 |
| sets of 6-pin CPU VID input. |
| |
| * Sensor resolutions |
| If your motherboard maker used the reference design, the resolution of |
| voltage0-2 is 2mV, resolution of voltage3/4/5 is 16mV, 8mV for voltage6, |
| 24mV for voltage7/8. Temp1-4 have a 0.25 degree Celsius resolution, |
| temp5-6 have a 1 degree Celsiis resolution. |
| |
| * Temperature sensor types |
| Temp1-4 have 3 possible types. It can be read from (and written to) |
| temp[1-4]_type. |
| - If the value of 0, the related temperature channel stops |
| monitoring. |
| - If the value is 3, it starts monitoring using a remote termal diode |
| (default). |
| - If the value is 5, it starts monitoring using the temperature sensor |
| in AMD CPU and get result by AMDSI. |
| - If the value is 6, it starts monitoring using the temperature sensor |
| in Intel CPU and get result by PECI. |
| Temp5-6 can be connected to external thermistors (value of |
| temp[5-6]_type is 4). They can also be disabled (value is 0). |
| |
| * Alarm mechanism |
| For voltage sensors, an alarm triggers if the measured value is below |
| the low voltage limit or over the high voltage limit. |
| For temperature sensors, an alarm triggers if the measured value goes |
| above the high temperature limit, and wears off only after the measured |
| value drops below the hysteresis value. |
| For fan sensors, an alarm triggers if the measured value is below the |
| low speed limit. |
| |
| * SmartFan/PWM control |
| If you want to set a pwm fan to manual mode, you just need to make sure it |
| is not controlled by any temp channel, for example, you want to set fan1 |
| to manual mode, you need to check the value of temp[1-6]_fan_map, make |
| sure bit 0 is cleared in the 6 values. And then set the pwm1 value to |
| control the fan. |
| |
| Each temperature channel can control all the 8 PWM outputs (by setting the |
| corresponding bit in tempX_fan_map), you can set the temperature channel |
| mode using temp[1-6]_pwm_enable, 2 is Thermal Cruise mode and 3 |
| is the SmartFanII mode. Temperature channels will try to speed up or |
| slow down all controlled fans, this means one fan can receive different |
| PWM value requests from different temperature channels, but the chip |
| will always pick the safest (max) PWM value for each fan. |
| |
| In Thermal Cruise mode, the chip attempts to keep the temperature at a |
| predefined value, within a tolerance margin. So if tempX_input > |
| thermal_cruiseX + toleranceX, the chip will increase the PWM value, |
| if tempX_input < thermal_cruiseX - toleranceX, the chip will decrease |
| the PWM value. If the temperature is within the tolerance range, the PWM |
| value is left unchanged. |
| |
| SmartFanII works differently, you have to define up to 7 PWM, temperature |
| trip points, defining a PWM/temperature curve which the chip will follow. |
| While not fundamentally different from the Thermal Cruise mode, the |
| implementation is quite different, giving you a finer-grained control. |
| |
| * Chassis |
| If the case open alarm triggers, it will stay in this state unless cleared |
| by any write to the sysfs file "chassis". |
| |
| * VID and VRM |
| The VRM version is detected automatically, don't modify the it unless you |
| *do* know the cpu VRM version and it's not properly detected. |
| |
| |
| Notes |
| ----- |
| |
| Only Fan1-5 and PWM1-3 are guaranteed to always exist, other fan inputs and |
| PWM outputs may or may not exist depending on the chip pin configuration. |