tree 4c120f00af87dab3f62c9cadf2d4bdbb00ff1729
parent 54cb8a74516689c76399d5817dabb6c2b53b045f
author Sam Lantinga <slouken@libsdl.org> 1567784574 -0700
committer Sam Lantinga <slouken@libsdl.org> 1567784574 -0700

Fixed bug 4789 - Linux accelerometers no longer available as joysticks

Daniel Drake

A long time ago, it was possible to play neverball on Linux using the accelerometer found in HP laptops.

The kernel exposes the accelerometer as a joystick (/dev/input/jsX) as well as an evdev device (/dev/input/eventX). I guess it worked fine when SDL was using the js interface, but then stopped working here: http://hg.libsdl.org/SDL/rev/fdaeea9e7567

Looking at current code which uses udev to discover joysticks, it looks for the udev tag ID_INPUT_JOYSTICK.

However udev's internal input_id logic specifically tags accelerometers as ID_INPUT_ACCELEROMETER and nothing else.

This looks like a good fit for SDL_HINT_ACCELEROMETER_AS_JOYSTICK.