Document the case of hybrid automatic fan speed control implementations, where trip points are associated to both PWM output channels and temperature input channels. Signed-off-by: Jean Delvare <khali@xxxxxxxxxxxx> --- While working on the adt7473 and adt7475 drivers, I have noticed that their implementation of automatic fan speed control doesn't match what we documented in the sysfs-interface document. As the implementation makes sense, I believe we shall keep it and update the documentation accordingly. Documentation/hwmon/sysfs-interface | 11 +++++++++-- 1 file changed, 9 insertions(+), 2 deletions(-) --- linux-2.6.32-rc7.orig/Documentation/hwmon/sysfs-interface 2009-11-04 09:27:12.000000000 +0100 +++ linux-2.6.32-rc7/Documentation/hwmon/sysfs-interface 2009-11-13 14:35:24.000000000 +0100 @@ -225,8 +225,6 @@ pwm[1-*]_auto_point[1-*]_temp_hyst to PWM output channels. RW -OR - temp[1-*]_auto_point[1-*]_pwm temp[1-*]_auto_point[1-*]_temp temp[1-*]_auto_point[1-*]_temp_hyst @@ -235,6 +233,15 @@ temp[1-*]_auto_point[1-*]_temp_hyst to temperature channels. RW +There is a third case where trip points are associated to both PWM output +channels and temperature channels: the PWM values are associated to PWM +output channels while the temperature values are associated to temperature +channels. In that case, the result is determined by the mapping between +temperature inputs and PWM outputs. When several temperature inputs are +mapped to a given PWM output, this leads to several candidate PWM values. +The actual result is up to the chip, but in general the highest candidate +value (fastest fan speed) wins. + **************** * Temperatures * -- Jean Delvare _______________________________________________ lm-sensors mailing list lm-sensors@xxxxxxxxxxxxxx http://lists.lm-sensors.org/mailman/listinfo/lm-sensors
