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authorJean Delvare <khali@linux-fr.org>2006-12-12 18:18:27 +0100
committerJean Delvare <khali@arrakis.delvare>2006-12-12 18:18:27 +0100
commite9cea646014e25aa96eefa1b41d373a6ad95c189 (patch)
treef648f1c662818020e6bce53c06d5fca02128f54a
parent315c7113b5580a5f88169b62f597aacd64ef3717 (diff)
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hwmon/f71805f: Document the fan control features
Document the different fan control methods, list their options, and give some hints for best results. Signed-off-by: Jean Delvare <khali@linux-fr.org>
-rw-r--r--Documentation/hwmon/f71805f42
1 files changed, 38 insertions, 4 deletions
diff --git a/Documentation/hwmon/f71805f b/Documentation/hwmon/f71805f
index 2ca69df669c3..bc571f99d0ee 100644
--- a/Documentation/hwmon/f71805f
+++ b/Documentation/hwmon/f71805f
@@ -13,8 +13,8 @@ Thanks to Denis Kieft from Barracuda Networks for the donation of a
test system (custom Jetway K8M8MS motherboard, with CPU and RAM) and
for providing initial documentation.
-Thanks to Kris Chen from Fintek for answering technical questions and
-providing additional documentation.
+Thanks to Kris Chen and Aaron Huang from Fintek for answering technical
+questions and providing additional documentation.
Thanks to Chris Lin from Jetway for providing wiring schematics and
answering technical questions.
@@ -28,8 +28,7 @@ capabilities. It can monitor up to 9 voltages (counting its own power
source), 3 fans and 3 temperature sensors.
This chip also has fan controlling features, using either DC or PWM, in
-three different modes (one manual, two automatic). The driver doesn't
-support these features yet.
+three different modes (one manual, two automatic).
The driver assumes that no more than one chip is present, which seems
reasonable.
@@ -103,3 +102,38 @@ sensor. Each channel can be used for connecting either a thermal diode
or a thermistor. The driver reports the currently selected mode, but
doesn't allow changing it. In theory, the BIOS should have configured
everything properly.
+
+
+Fan Control
+-----------
+
+Both PWM (pulse-width modulation) and DC fan speed control methods are
+supported. The right one to use depends on external circuitry on the
+motherboard, so the driver assumes that the BIOS set the method
+properly. The driver will report the method, but won't let you change
+it.
+
+When the PWM method is used, you can select the operating frequency,
+from 187.5 kHz (default) to 31 Hz. The best frequency depends on the
+fan model. As a rule of thumb, lower frequencies seem to give better
+control, but may generate annoying high-pitch noise. Fintek recommends
+not going below 1 kHz, as the fan tachometers get confused by lower
+frequencies as well.
+
+When the DC method is used, Fintek recommends not going below 5 V, which
+corresponds to a pwm value of 106 for the driver. The driver doesn't
+enforce this limit though.
+
+Three different fan control modes are supported:
+
+* Manual mode
+ You ask for a specific PWM duty cycle or DC voltage.
+
+* Fan speed mode
+ You ask for a specific fan speed. This mode assumes that pwm1
+ corresponds to fan1, pwm2 to fan2 and pwm3 to fan3.
+
+* Temperature mode
+ You define 3 temperature/fan speed trip points, and the fan speed is
+ adjusted depending on the measured temperature, using interpolation.
+ This mode is not yet supported by the driver.