On 04/05/17 04:10, Guenter Roeck wrote: > On Wed, May 03, 2017 at 12:40:08PM +1200, Chris Packham wrote: >> 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 <chris.packham@xxxxxxxxxxxxxxxxxxx> >> --- >> Changes in v2: >> - use pwmN_stall_dis as the attribute name. I think this describes the purpose >> pretty well. I went with a new attribute instead of overloading >> pwmN_auto_point1_pwm so this doesn't affect existing users. >> >> Documentation/hwmon/adt7475 | 5 +++++ >> drivers/hwmon/adt7475.c | 50 +++++++++++++++++++++++++++++++++++++++++++++ >> 2 files changed, 55 insertions(+) >> >> diff --git a/Documentation/hwmon/adt7475 b/Documentation/hwmon/adt7475 >> index 0502f2b464e1..63507402cd4f 100644 >> --- a/Documentation/hwmon/adt7475 >> +++ b/Documentation/hwmon/adt7475 >> @@ -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 be configured using the >> +pwm[1-*]_stall_dis sysfs attribute. A value of 0 means the fans will shut off. > > That is really an awkward attribute name. I'll have to think about this some > more. I agree. The other thing I considered was "halt" and using inverted logic so halt == 1 reflected the HW default of allowing fans to stop. -- To unsubscribe from this list: send the line "unsubscribe linux-doc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
