Steam Controller

The Steam Controller is Valve.]] It features two trackpads (in place of thumbsticks) with haptic feedback and sixteen buttons. The Steam controller is designed not only for games supporting traditional controllers, but also for games that support keyboard and mouse.

Kernel
The Steam Controller is fully supported by Linux via the Steam client, however it does require USB and user level driver ( CONFIG_INPUT_UINPUT ) support.

To have kernel support for the Steam controller (which makes it possible to use the Steam controller when not running the Steam client), enable the driver support in the kernel ( CONFIG_HID_STEAM ). Steam Controller support was added in kernel version 4.3 and above.

systemd
If Steam was installed manually and systemd/elogind are being used, create the following udev rules file:

The above udev rules file will grant access to the Steam Controller by automatically setting an ACL entry for the logged-in user.

If Steam was installed from anyc's Steam external repository, a udev rules file that supports systemd/elogind should already be installed with the ebuild.

Next, reload the udev rules files and trigger a device event for the new rule:

Once the udev rules files are reloaded, the user using the Steam Controller will need to log out/in for the correct permissions to be set.

Manual udev
If Steam was installed manually or from an external repository, and systemd/elogind are not being used, create the following udev rules file:

The above udev rules file will grant access to the Steam Controller for users in the group: