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authorJean Delvare <khali@linux-fr.org>2009-12-09 14:35:47 -0500
committerJean Delvare <khali@linux-fr.org>2009-12-09 14:35:47 -0500
commitf7290e24e3ce8a0b4b39a74800fd341b6b7a6f47 (patch)
tree985b1e927f88dfee98af6463852fd936f3335af9 /Documentation
parent047f4ec29453ad8a785ccab7d8098f28149828e2 (diff)
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')
-rw-r--r--Documentation/hwmon/sysfs-interface11
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
225 to PWM output channels. 225 to PWM output channels.
226 RW 226 RW
227 227
228OR
229
230temp[1-*]_auto_point[1-*]_pwm 228temp[1-*]_auto_point[1-*]_pwm
231temp[1-*]_auto_point[1-*]_temp 229temp[1-*]_auto_point[1-*]_temp
232temp[1-*]_auto_point[1-*]_temp_hyst 230temp[1-*]_auto_point[1-*]_temp_hyst
@@ -235,6 +233,15 @@ temp[1-*]_auto_point[1-*]_temp_hyst
235 to temperature channels. 233 to temperature channels.
236 RW 234 RW
237 235
236There is a third case where trip points are associated to both PWM output
237channels and temperature channels: the PWM values are associated to PWM
238output channels while the temperature values are associated to temperature
239channels. In that case, the result is determined by the mapping between
240temperature inputs and PWM outputs. When several temperature inputs are
241mapped to a given PWM output, this leads to several candidate PWM values.
242The actual result is up to the chip, but in general the highest candidate
243value (fastest fan speed) wins.
244
238 245
239**************** 246****************
240* Temperatures * 247* Temperatures *