DualShock 4 gyro recognized by evdev but not SDL

SDL Development
4

First you need to enable enhanced mode to turn on rumble and sensors:

SDL_SetHint(SDL_HINT_JOYSTICK_HIDAPI_PS4_RUMBLE, "1");
SDL_SetHint(SDL_HINT_JOYSTICK_HIDAPI_PS5_RUMBLE, "1");

Then, on Linux, SDL uses hidraw to read the device so you need to set the read right with an udev rule. The easy way to do that is to install steam-devices package.

If your distribution does not provide this package, you can add the rule yourself in /usr/lib/udev/rules.d/. Here the rules for Dualshock controller from the steam-devices package:

# DualShock 4 over USB hidraw
KERNEL=="hidraw*", ATTRS{idVendor}=="054c", ATTRS{idProduct}=="05c4", MODE="0660", TAG+="uaccess"

# DualShock 4 wireless adapter over USB hidraw
KERNEL=="hidraw*", ATTRS{idVendor}=="054c", ATTRS{idProduct}=="0ba0", MODE="0660", TAG+="uaccess"

# DualShock 4 Slim over USB hidraw
KERNEL=="hidraw*", ATTRS{idVendor}=="054c", ATTRS{idProduct}=="09cc", MODE="0660", TAG+="uaccess"

# DualShock 4 over bluetooth hidraw
KERNEL=="hidraw*", KERNELS=="*054C:05C4*", MODE="0660", TAG+="uaccess"

# DualShock 4 Slim over bluetooth hidraw
KERNEL=="hidraw*", KERNELS=="*054C:09CC*", MODE="0660", TAG+="uaccess"