linux/Documentation/hwmon/f71805f
Jean Delvare e9cea64601 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>
2006-12-12 18:18:27 +01:00

140 lines
5.1 KiB
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Kernel driver f71805f
=====================
Supported chips:
* Fintek F71805F/FG
Prefix: 'f71805f'
Addresses scanned: none, address read from Super I/O config space
Datasheet: Provided by Fintek on request
Author: Jean Delvare <khali@linux-fr.org>
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 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.
Description
-----------
The Fintek F71805F/FG Super I/O chip includes complete hardware monitoring
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 assumes that no more than one chip is present, which seems
reasonable.
Voltage Monitoring
------------------
Voltages are sampled by an 8-bit ADC with a LSB of 8 mV. The supported
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.
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).
The wirings and resistor values suggested by Fintek are as follow:
pin expected
name use R1 R2 divider raw val.
in0 VCC VCC3.3V int. int. 2.00 1.65 V
in1 VIN1 VTT1.2V 10K - 1.00 1.20 V
in2 VIN2 VRAM 100K 100K 2.00 ~1.25 V (1)
in3 VIN3 VCHIPSET 47K 100K 1.47 2.24 V (2)
in4 VIN4 VCC5V 200K 47K 5.25 0.95 V
in5 VIN5 +12V 200K 20K 11.00 1.05 V
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
(1) Depends on your hardware setup.
(2) Obviously not correct, swapping R1 and R2 would make more sense.
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
Jetway K8M8MS uses a significantly different setup. You will have to
find out documentation about your own motherboard, and edit sensors.conf
accordingly.
Each voltage measured has associated low and high limits, each of which
triggers an alarm when crossed.
Fan Monitoring
--------------
Fan rotation speeds are reported as 12-bit values from a gated clock
signal. Speeds down to 366 RPM can be measured. There is no theoretical
high limit, but values over 6000 RPM seem to cause problem. The effective
resolution is much lower than you would expect, the step between different
register values being 10 rather than 1.
The chip assumes 2 pulse-per-revolution fans.
An alarm is triggered if the rotation speed drops below a programmable
limit or is too low to be measured.
Temperature Monitoring
----------------------
Temperatures are reported in degrees Celsius. Each temperature measured
has a high limit, those crossing triggers an alarm. There is an associated
hysteresis value, below which the temperature has to drop before the
alarm is cleared.
All temperature channels are external, there is no embedded temperature
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.