Home

Resources for Oversteer development

Steering wheels are seen by the system as joysticks with several axes, buttons and FFB. The axes and buttons are no problem, but FFB uses propietary protocols.

Currently, the Linux kernel provides an API to access FFB in Logitech wheels through evdev. SDL2 has also APIs for handling FFB.

Logitech FFB docs:

• https://opensource.logitech.com/opensource/index.php/Technical_Information

Kernel related links:

• https://www.kernel.org/doc/html/latest/input/ff.html
• https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/input/ff-memless.c
• https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/hid/hid-lg4ff.c
• https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/hid/hid-logitech-hidpp.c
• https://www.kernel.org/doc/Documentation/hid/hidraw.txt

SDL2 related links:

• https://wiki.libsdl.org/CategoryForceFeedback
• https://hg.libsdl.org/SDL/file/d953f28d33e3/src/haptic/linux/SDL_syshaptic.c

Examples of use:

• https://sourceforge.net/p/linuxconsole/code/ci/master/tree/utils/fftest.c
• https://sourceforge.net/p/linuxconsole/code/ci/master/tree/utils/ffset.c

Others:

• https://github.com/Eliasvan/Linux-Force-Feedback/wiki
• https://github.com/edwin-v/linux-hid-lg4ff-next
• https://lkml.org/lkml/2014/4/26/115
• https://github.com/ValveSoftware/Proton/issues/2366#issuecomment-529254481
• https://steamcommunity.com/groups/linuxff/discussions/0/405692224235574471/
• https://forum.scssoft.com/viewtopic.php?f=109&t=249622
• https://www.desktopsimulators.com/forum/showthread.php?tid=378
• https://lkml.org/lkml/2014/5/21/325