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-Kernel driver w83792d
-=====================
-
-Supported chips:
- * Winbond W83792D
- Prefix: 'w83792d'
- Addresses scanned: I2C 0x2c - 0x2f
- Datasheet: http://www.winbond.com.tw
-
-Author: Chunhao Huang
-Contact: DZShen <DZShen@Winbond.com.tw>
-
-
-Module Parameters
------------------
-
-* init int
- (default 1)
- Use 'init=0' to bypass initializing the chip.
- Try this if your computer crashes when you load the module.
-
-* force_subclients=bus,caddr,saddr,saddr
- This is used to force the i2c addresses for subclients of
- a certain chip. Example 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 the Winbond W83792AD/D.
-
-Detection of the chip can sometimes be foiled because it can be in an
-internal state that allows no clean access (Bank with ID register is not
-currently selected). If you know the address of the chip, use a 'force'
-parameter; this will put it into a more well-behaved state first.
-
-The driver implements three temperature sensors, seven fan rotation speed
-sensors, nine voltage sensors, and two automatic fan regulation
-strategies called: Smart Fan I (Thermal Cruise mode) and Smart Fan II.
-Automatic fan control mode is possible only for fan1-fan3. Fan4-fan7 can run
-synchronized with selected fan (fan1-fan3). This functionality and manual PWM
-control for fan4-fan7 is not yet implemented.
-
-Temperatures are measured in degrees Celsius and measurement resolution is 1
-degC for temp1 and 0.5 degC for temp2 and temp3. An alarm is triggered when
-the temperature gets higher than the Overtemperature Shutdown value; it stays
-on until the temperature falls below the Hysteresis value.
-
-Fan rotation speeds are reported in RPM (rotations per minute). An alarm is
-triggered if the rotation speed has dropped below a programmable limit. Fan
-readings can be divided by a programmable divider (1, 2, 4, 8, 16, 32, 64 or
-128) to give the readings more range or accuracy.
-
-Voltage sensors (also known as IN sensors) report their values in millivolts.
-An alarm is triggered if the voltage has crossed a programmable minimum
-or maximum limit.
-
-Alarms are provided as output from "realtime status register". Following bits
-are defined:
-
-bit - alarm on:
-0 - in0
-1 - in1
-2 - temp1
-3 - temp2
-4 - temp3
-5 - fan1
-6 - fan2
-7 - fan3
-8 - in2
-9 - in3
-10 - in4
-11 - in5
-12 - in6
-13 - VID change
-14 - chassis
-15 - fan7
-16 - tart1
-17 - tart2
-18 - tart3
-19 - in7
-20 - in8
-21 - fan4
-22 - fan5
-23 - fan6
-
-Tart will be asserted while target temperature cannot be achieved after 3 minutes
-of full speed rotation of corresponding fan.
-
-In addition to the alarms described above, there is a CHAS alarm on the chips
-which triggers if your computer case is open (This one is latched, contrary
-to realtime alarms).
-
-The chips only update values each 3 seconds; reading them more often will
-do no harm, but will return 'old' values.
-
-
-W83792D PROBLEMS
-----------------
-Known problems:
- - This driver is only for Winbond W83792D C version device, there
- are also some motherboards with B version W83792D device. The
- calculation method to in6-in7(measured value, limits) is a little
- different between C and B version. C or B version can be identified
- by CR[0x49h].
- - The function of vid and vrm has not been finished, because I'm NOT
- very familiar with them. Adding support is welcome.
-  - The function of chassis open detection needs more tests.
- - If you have ASUS server board and chip was not found: Then you will
- need to upgrade to latest (or beta) BIOS. If it does not help please
- contact us.
-
-Fan control
------------
-
-Manual mode
------------
-
-Works as expected. You just need to specify desired PWM/DC value (fan speed)
-in appropriate pwm# file.
-
-Thermal cruise
---------------
-
-In this mode, W83792D provides the Smart Fan system to automatically control
-fan speed to keep the temperatures of CPU and the system within specific
-range. At first a wanted temperature and interval must be set. This is done
-via thermal_cruise# file. The tolerance# file serves to create T +- tolerance
-interval. The fan speed will be lowered as long as the current temperature
-remains below the thermal_cruise# +- tolerance# value. Once the temperature
-exceeds the high limit (T+tolerance), the fan will be turned on with a
-specific speed set by pwm# and automatically controlled its PWM duty cycle
-with the temperature varying. Three conditions may occur:
-
-(1) If the temperature still exceeds the high limit, PWM duty
-cycle will increase slowly.
-
-(2) If the temperature goes below the high limit, but still above the low
-limit (T-tolerance), the fan speed will be fixed at the current speed because
-the temperature is in the target range.
-
-(3) If the temperature goes below the low limit, PWM duty cycle will decrease
-slowly to 0 or a preset stop value until the temperature exceeds the low
-limit. (The preset stop value handling is not yet implemented in driver)
-
-Smart Fan II
-------------
-
-W83792D also provides a special mode for fan. Four temperature points are
-available. When related temperature sensors detects the temperature in preset
-temperature region (sf2_point@_fan# +- tolerance#) it will cause fans to run
-on programmed value from sf2_level@_fan#. You need to set four temperatures
-for each fan.
-
-
-/sys files
-----------
-
-pwm[1-3] - this file stores PWM duty cycle or DC value (fan speed) in range:
- 0 (stop) to 255 (full)
-pwm[1-3]_enable - this file controls mode of fan/temperature control:
- * 0 Disabled
- * 1 Manual mode
- * 2 Smart Fan II
- * 3 Thermal Cruise
-pwm[1-3]_mode - Select PWM of DC mode
- * 0 DC
- * 1 PWM
-thermal_cruise[1-3] - Selects the desired temperature for cruise (degC)
-tolerance[1-3] - Value in degrees of Celsius (degC) for +- T
-sf2_point[1-4]_fan[1-3] - four temperature points for each fan for Smart Fan II
-sf2_level[1-3]_fan[1-3] - three PWM/DC levels for each fan for Smart Fan II