Make Xorg recognize libevdev virtual device - c

Question

I've been trying to create a simple program using libevdev to make a virtual device that will simply move the mouse by 50 points on the X axis every second. The program runs just fine, however Xorg won't recognize the newly created virtual device.
I suppose it's going to be something trivial, but I cannot figure out what.
Xorgs' logs say:
[ 5860.310] (II) config/udev: Adding input device test device Mouse (/dev/input/event18)
[ 5860.310] (II) No input driver specified, ignoring this device.
[ 5860.310] (II) This device may have been added with another device file.
The program:
#include <libevdev/libevdev.h>
#include <libevdev/libevdev-uinput.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
static void check(int i) {
if (i < 0) {
printf("%s\n", strerror(-i));
exit(1);
}
}
int main() {
struct libevdev* evdev = libevdev_new();
libevdev_set_name(evdev, "test device Mouse");
libevdev_set_id_vendor(evdev, 0x1);
libevdev_set_id_product(evdev, 0x1);
libevdev_set_id_version(evdev, 0x1);
libevdev_set_id_bustype(evdev, BUS_USB);
check(libevdev_enable_event_type(evdev, EV_REL));
check(libevdev_enable_event_code(evdev, EV_REL, REL_X, NULL));
check(libevdev_enable_event_code(evdev, EV_REL, REL_Y, NULL));
check(libevdev_enable_event_code(evdev, EV_SYN, SYN_REPORT, NULL));
struct libevdev_uinput* uinput;
check(libevdev_uinput_create_from_device(evdev, LIBEVDEV_UINPUT_OPEN_MANAGED, &uinput));
for (int i = 0; i < 1000; i++) {
check(libevdev_uinput_write_event(uinput, EV_REL, REL_X, 50));
check(libevdev_uinput_write_event(uinput, EV_SYN, SYN_REPORT, 0));
sleep(1);
}
}
What am I doing wrong?

Answer 1

The issue was that mouse buttons need to be enabled for mouse movements to work.
Adding these lines fixes the issue:
check(libevdev_enable_event_type(evdev, EV_KEY));
check(libevdev_enable_event_code(evdev, EV_KEY, BTN_LEFT, NULL));
check(libevdev_enable_event_code(evdev, EV_KEY, BTN_RIGHT, NULL));