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hwmon: (adt7475) fan stall prevention

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By default adt7475 will stop the fans (pwm duty cycle 0%) when the
temperature drops past Tmin - hysteresis. Some systems want to keep the
fans moving even when the temperature drops so add new sysfs attributes
that configure the enhanced acoustics min 1-3 which allows the fans to
run at the minimum configure pwm duty cycle.

Signed-off-by: Chris Packham <[email protected]>
Signed-off-by: Guenter Roeck <[email protected]>
This commit is contained in:
Chris Packham 2017-05-15 13:30:27 +12:00 • committed by Guenter Roeck
commit 1d58f5efbf
2 changed files with 55 additions and 0 deletions
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@ -109,6 +109,11 @@ fan speed) is applied. PWM values range from 0 (off) to 255 (full speed).
Fan speed may be set to maximum when the temperature sensor associated with
the PWM control exceeds temp#_max.
At Tmin - hysteresis the PWM output can either be off (0% duty cycle) or at the
minimum (i.e. auto_point1_pwm). This behaviour can be configured using the
pwm[1-*]_stall_disable sysfs attribute. A value of 0 means the fans will shut
off. A value of 1 means the fans will run at auto_point1_pwm.
Notes
-----