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- Kernel driver f71882fg
- ======================
- Supported chips:
- * Fintek F71882FG and F71883FG
- Prefix: 'f71882fg'
- Addresses scanned: none, address read from Super I/O config space
- Datasheet: Available from the Fintek website
- * Fintek F71862FG and F71863FG
- Prefix: 'f71862fg'
- Addresses scanned: none, address read from Super I/O config space
- Datasheet: Available from the Fintek website
- * Fintek F8000
- Prefix: 'f8000'
- Addresses scanned: none, address read from Super I/O config space
- Datasheet: Not public
- Author: Hans de Goede <hdegoede@redhat.com>
- Description
- -----------
- Fintek F718xxFG/F8000 Super I/O chips include complete hardware monitoring
- capabilities. They can monitor up to 9 voltages (3 for the F8000), 4 fans and
- 3 temperature sensors.
- These chips also have 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.
- Monitoring
- ----------
- The Voltage, Fan and Temperature Monitoring uses the standard sysfs
- interface as documented in sysfs-interface, without any exceptions.
- 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.
- There are 2 modes to specify the speed of the fan, PWM duty cycle (or DC
- voltage) mode, where 0-100% duty cycle (0-100% of 12V) is specified. And RPM
- mode where the actual RPM of the fan (as measured) is controlled and the speed
- gets specified as 0-100% of the fan#_full_speed file.
- Since both modes work in a 0-100% (mapped to 0-255) scale, there isn't a
- whole lot of a difference when modifying fan control settings. The only
- important difference is that in RPM mode the 0-100% controls the fan speed
- between 0-100% of fan#_full_speed. It is assumed that if the BIOS programs
- RPM mode, it will also set fan#_full_speed properly, if it does not then
- fan control will not work properly, unless you set a sane fan#_full_speed
- value yourself.
- Switching between these modes requires re-initializing a whole bunch of
- registers, so the mode which the BIOS has set is kept. The mode is
- printed when loading the driver.
- Three different fan control modes are supported; the mode number is written
- to the pwm#_enable file. Note that not all modes are supported on all
- chips, and some modes may only be available in RPM / PWM mode on the F8000.
- Writing an unsupported mode will result in an invalid parameter error.
- * 1: Manual mode
- You ask for a specific PWM duty cycle / DC voltage or a specific % of
- fan#_full_speed by writing to the pwm# file. This mode is only
- available on the F8000 if the fan channel is in RPM mode.
- * 2: Normal auto mode
- You can define a number of temperature/fan speed trip points, which % the
- fan should run at at this temp and which temp a fan should follow using the
- standard sysfs interface. The number and type of trip points is chip
- depended, see which files are available in sysfs.
- Fan/PWM channel 3 of the F8000 is always in this mode!
- * 3: Thermostat mode (Only available on the F8000 when in duty cycle mode)
- The fan speed is regulated to keep the temp the fan is mapped to between
- temp#_auto_point2_temp and temp#_auto_point3_temp.
- Both of the automatic modes require that pwm1 corresponds to fan1, pwm2 to
- fan2 and pwm3 to fan3.
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