* Fintek F71805F/FG
Prefix: 'f71805f'
Addresses scanned: none, address read from Super I/O config space
- Datasheet: Provided by Fintek on request
+ Datasheet: Available from the Fintek website
+ * Fintek F71806F/FG
+ Prefix: 'f71872f'
+ Addresses scanned: none, address read from Super I/O config space
+ Datasheet: Available from the Fintek website
+ * Fintek F71872F/FG
+ Prefix: 'f71872f'
+ Addresses scanned: none, address read from Super I/O config space
+ Datasheet: Available from the Fintek website
Author: Jean Delvare <khali@linux-fr.org>
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
-anwsering technical questions.
+answering technical questions.
Description
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 Fintek F71872F/FG Super I/O chip is almost the same, with two
+additional internal voltages monitored (VSB and battery). It also features
+6 VID inputs. The VID inputs are not yet supported by this driver.
+
+The Fintek F71806F/FG Super-I/O chip is essentially the same as the
+F71872F/FG, and is undistinguishable therefrom.
The driver assumes that no more than one chip is present, which seems
reasonable.
range is thus from 0 to 2.040 V. Voltage values outside of this range
need external resistors. An exception is in0, which is used to monitor
the chip's own power source (+3.3V), and is divided internally by a
-factor 2.
+factor 2. For the F71872F/FG, in9 (VSB) and in10 (battery) are also
+divided internally by a factor 2.
The two LSB of the voltage limit registers are not used (always 0), so
you can only set the limits in steps of 32 mV (before scaling).
in6 VIN6 VCC1.5V 10K - 1.00 1.50 V
in7 VIN7 VCORE 10K - 1.00 ~1.40 V (1)
in8 VIN8 VSB5V 200K 47K 1.00 0.95 V
+in10 VSB VSB3.3V int. int. 2.00 1.65 V (3)
+in9 VBAT VBATTERY int. int. 2.00 1.50 V (3)
(1) Depends on your hardware setup.
(2) Obviously not correct, swapping R1 and R2 would make more sense.
+(3) F71872F/FG only.
These values can be used as hints at best, as motherboard manufacturers
are free to use a completely different setup. As a matter of fact, the
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. So a frequency just
+above the audible range, such as 25 kHz, may be a good choice; if this
+doesn't give you good linear control, try reducing it. 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; the mode number is written
+to the pwm<n>_enable file.
+
+* 1: Manual mode
+ You ask for a specific PWM duty cycle or DC voltage by writing to the
+ pwm<n> file.
+
+* 2: Temperature mode
+ You define 3 temperature/fan speed trip points using the
+ pwm<n>_auto_point<m>_temp and _fan files. These define a staircase
+ relationship between temperature and fan speed with two additional points
+ interpolated between the values that you define. When the temperature
+ is below auto_point1_temp the fan is switched off.
+
+* 3: Fan speed mode
+ You ask for a specific fan speed by writing to the fan<n>_target file.
+
+Both of the automatic modes require that pwm1 corresponds to fan1, pwm2 to
+fan2 and pwm3 to fan3. Temperature mode also requires that temp1 corresponds
+to pwm1 and fan1, etc.