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| author | Jean Delvare <khali@linux-fr.org> | 2009-12-09 20:35:47 +0100 |
|---|---|---|
| committer | Jean Delvare <khali@linux-fr.org> | 2009-12-09 20:35:47 +0100 |
| commit | f7290e24e3ce8a0b4b39a74800fd341b6b7a6f47 (patch) | |
| tree | 985b1e927f88dfee98af6463852fd936f3335af9 /Documentation/hwmon | |
| parent | MAINTAINERS: Add missing hwmon files (diff) | |
| download | linux-f7290e24e3ce8a0b4b39a74800fd341b6b7a6f47.tar.xz linux-f7290e24e3ce8a0b4b39a74800fd341b6b7a6f47.zip | |
hwmon: Clarify autopwm trip points documentation
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@linux-fr.org>
Diffstat (limited to 'Documentation/hwmon')
| -rw-r--r-- | Documentation/hwmon/sysfs-interface | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/Documentation/hwmon/sysfs-interface b/Documentation/hwmon/sysfs-interface index 82def883361b..3de6b0bcb147 100644 --- a/Documentation/hwmon/sysfs-interface +++ b/Documentation/hwmon/sysfs-interface @@ -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 * |