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-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 2 possible types. It can be read from (and written to)
- temp[1-4]_type.
- - If the value is 3, it starts monitoring using a remote termal diode
- (default).
- - 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).
-
-* 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 writing 0 to the sysfs file "intrusion0_alarm".
-
-* 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.