Add support for new EV_BTN event in linux joystick
#14758
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Lawstorant
changed the title
EV_BTN event in evdevEV_BTN event in linux joystick
slouken
reviewed
Jan 4, 2026
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It looks like this has the potential to change gamepad mappings. Are you sure that game controllers will have the buttons in the same order between new and old kernels? |
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Author
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This only applies to Joysticks as of now. As far as order of buttons is concerned, it should be the same if drivers don't change it. Still, gamepads are kept on EV_KEY and things will still change depending on the lkml discussion |
Adds support for new EV_BTN event that'll be used in place of EV_KEY for joysticks and maybe gamepads. This event doesn't require any mapping as it simply passes through button number as the code (starting from 1 just like HID) and it's value. It was needed to cleanly support joysticks and simracing/simflight hardware that defines more than 80 buttons. Some HW used hacks in the drivers that assigned random usages found lower than TRIGGER_HAPPPY range.
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Author
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@slouken I thought that maybe instead of redefining missing usages, a better way would be to make |
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Description
Adds support for new
EV_BTNevent that'll be used in place ofEV_KEYfor joysticks and maybe gamepads. This event doesn't require any mapping as it simply passes through button number as the code (starting from 1 just like HID) and it's value.It was needed to cleanly support joysticks and simracing/simflight hardware that defines more than 80 buttons. Some HW used hacks in the drivers that assigned random usages found lower then
TRIGGER_HAPPPYrange.WIP work dependent on upstream patches to LKML: https://lore.kernel.org/all/[email protected]/
All 128 buttons visible in Wine without usage hacks (SDL bus):