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hwmon: (nct6775) Add support for automatic fan control
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
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@ -87,6 +87,75 @@ pwm[1-5]_mode - controls if output is PWM or DC level
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* 0 DC output
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* 1 PWM output
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Common fan control attributes
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-----------------------------
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pwm[1-5]_temp_sel Temperature source. Value is temperature sensor index.
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For example, select '1' for temp1_input.
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Thermal Cruise mode (2)
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-----------------------
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If the temperature is in the range defined by:
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pwm[1-5]_target_temp Target temperature, unit millidegree Celsius
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(range 0 - 127000)
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pwm[1-5]_temp_tolerance
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Target temperature tolerance, unit millidegree Celsius
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there are no changes to fan speed. Once the temperature leaves the interval, fan
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speed increases (if temperature is higher that desired) or decreases (if
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temperature is lower than desired), using the following limits and time
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intervals.
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pwm[1-5]_start fan pwm start value (range 1 - 255), to start fan
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when the temperature is above defined range.
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pwm[1-5]_floor lowest fan pwm (range 0 - 255) if temperature is below
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the defined range. If set to 0, the fan is expected to
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stop if the temperature is below the defined range.
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pwm[1-5]_step_up_time milliseconds before fan speed is increased
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pwm[1-5]_step_down_time milliseconds before fan speed is decreased
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pwm[1-5]_stop_time how many milliseconds must elapse to switch
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corresponding fan off (when the temperature was below
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defined range).
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Speed Cruise mode (3)
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---------------------
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This modes tries to keep the fan speed constant.
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fan[1-5]_target Target fan speed
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fan[1-5]_tolerance
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Target speed tolerance
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Untested; use at your own risk.
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Smart Fan IV mode (5)
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---------------------
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This mode offers multiple slopes to control the fan speed. The slopes can be
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controlled by setting the pwm and temperature attributes. When the temperature
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rises, the chip will calculate the DC/PWM output based on the current slope.
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There are up to seven data points depending on the chip type. Subsequent data
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points should be set to higher temperatures and higher pwm values to achieve
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higher fan speeds with increasing temperature. The last data point reflects
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critical temperature mode, in which the fans should run at full speed.
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pwm[1-5]_auto_point[1-7]_pwm
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pwm value to be set if temperature reaches matching
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temperature range.
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pwm[1-5]_auto_point[1-7]_temp
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Temperature over which the matching pwm is enabled.
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pwm[1-5]_temp_tolerance
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Temperature tolerance, unit millidegree Celsius
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pwm[1-5]_crit_temp_tolerance
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Temperature tolerance for critical temperature,
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unit millidegree Celsius
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pwm[1-5]_step_up_time milliseconds before fan speed is increased
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pwm[1-5]_step_down_time milliseconds before fan speed is decreased
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Usage Notes
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-----------
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