linux-sg2042/Documentation/ABI/testing/sysfs-driver-hid-logitech-l...

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What: /sys/module/hid_logitech/drivers/hid:logitech/<dev>/range.
Date: July 2011
KernelVersion: 3.2
Contact: Michal Malý <madcatxster@gmail.com>
Description: Display minimum, maximum and current range of the steering
wheel. Writing a value within min and max boundaries sets the
range of the wheel.
What: /sys/bus/hid/drivers/logitech/<dev>/alternate_modes
Date: Feb 2015
KernelVersion: 4.1
Contact: Michal Malý <madcatxster@gmail.com>
Description: Displays a set of alternate modes supported by a wheel. Each
mode is listed as follows:
Tag: Mode Name
Currently active mode is marked with an asterisk. List also
contains an abstract item "native" which always denotes the
native mode of the wheel. Echoing the mode tag switches the
wheel into the corresponding mode. Depending on the exact model
of the wheel not all listed modes might always be selectable.
If a wheel cannot be switched into the desired mode, -EINVAL
is returned accompanied with an explanatory message in the
kernel log.
This entry is not created for devices that have only one mode.
Currently supported mode switches:
Driving Force Pro:
DF-EX --> DFP
G25:
DF-EX --> DFP --> G25
G27:
DF-EX <*> DFP <-> G25 <-> G27
DF-EX <*--------> G25 <-> G27
DF-EX <*----------------> G27
DFGT:
DF-EX <*> DFP <-> DFGT
DF-EX <*--------> DFGT
* hid_logitech module must be loaded with lg4ff_no_autoswitch=1
parameter set in order for the switch to DF-EX mode to work.
What: /sys/bus/hid/drivers/logitech/<dev>/real_id
Date: Feb 2015
KernelVersion: 4.1
Contact: Michal Malý <madcatxster@gmail.com>
Description: Displays the real model of the wheel regardless of any
alternate mode the wheel might be switched to.
It is a read-only value.
This entry is not created for devices that have only one mode.