mirror of
https://github.com/torvalds/linux.git
synced 2024-11-01 13:03:25 +01:00
7ebd8b66dd
Now that all files were converted to ReST format, rename them and add an index. Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
181 lines
6.7 KiB
ReStructuredText
181 lines
6.7 KiB
ReStructuredText
Kernel driver f71805f
|
|
=====================
|
|
|
|
Supported chips:
|
|
|
|
* Fintek F71805F/FG
|
|
|
|
Prefix: 'f71805f'
|
|
|
|
Addresses scanned: none, address read from Super I/O config space
|
|
|
|
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 <jdelvare@suse.de>
|
|
|
|
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 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.
|
|
|
|
|
|
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. 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).
|
|
|
|
The wirings and resistor values suggested by Fintek are as follow:
|
|
|
|
======= ======= =========== ==== ======= ============ ==============
|
|
in 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
|
|
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
|
|
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. 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.
|