C++ (Cpp) libevdev_get_abs_info Examples

Example #1

File: libevdev-tweak-device.c Project: jiixyj/libevdev

static void
set_abs(struct libevdev *dev, unsigned int changes,
	unsigned int axis, struct input_absinfo *absinfo)
{
	int rc;
	struct input_absinfo abs;
	const struct input_absinfo *a;

	if ((a = libevdev_get_abs_info(dev, axis)) == NULL) {
		fprintf(stderr,
			"Device '%s' doesn't have axis %s\n",
			libevdev_get_name(dev),
			libevdev_event_code_get_name(EV_ABS, axis));
		return;
	}

	abs = *a;
	if (changes & OPT_MIN)
		abs.minimum = absinfo->minimum;
	if (changes & OPT_MAX)
		abs.maximum = absinfo->maximum;
	if (changes & OPT_FUZZ)
		abs.fuzz = absinfo->fuzz;
	if (changes & OPT_FLAT)
		abs.flat = absinfo->flat;
	if (changes & OPT_RES)
		abs.resolution = absinfo->resolution;

	rc = libevdev_kernel_set_abs_info(dev, axis, &abs);
	if (rc != 0)
		fprintf(stderr,
			"Failed to set absinfo %s: %s",
			libevdev_event_code_get_name(EV_ABS, axis),
			strerror(-rc));
}

Example #2

File: joystick_linux.cpp Project: Scrik/godot

uint32_t joystick_linux::process_joysticks(uint32_t p_event_id) {

	if (joy_mutex->try_lock() != OK) {
		return p_event_id;
	}
	for (int i=0; i<JOYSTICKS_MAX; i++) {

		if (joysticks[i].fd == -1) continue;

		input_event ev;
		Joystick* joy = &joysticks[i];
		libevdev* dev = joy->dev;
		int rc = 1;

		rc = libevdev_next_event(dev, LIBEVDEV_READ_FLAG_NORMAL, &ev);

		if (rc < 0 && rc != -EAGAIN) {
			continue;
		}

		while (rc == LIBEVDEV_READ_STATUS_SYNC || rc == LIBEVDEV_READ_STATUS_SUCCESS) {

			switch (ev.type) {
			case EV_KEY:
				p_event_id = input->joy_button(p_event_id, i, joy->key_map[ev.code], ev.value);
				break;

			case EV_ABS:

				switch (ev.code) {
				case ABS_HAT0X:
					if (ev.value != 0) {
						if (ev.value < 0) joy->dpad |= InputDefault::HAT_MASK_LEFT;
						else              joy->dpad |= InputDefault::HAT_MASK_RIGHT;

					}
					else joy->dpad &= ~(InputDefault::HAT_MASK_LEFT | InputDefault::HAT_MASK_RIGHT);

					p_event_id = input->joy_hat(p_event_id, i, joy->dpad);
					break;

				case ABS_HAT0Y:
					if (ev.value != 0) {
						if (ev.value < 0) joy->dpad |= InputDefault::HAT_MASK_UP;
						else              joy->dpad |= InputDefault::HAT_MASK_DOWN;
					}
					else joy->dpad &= ~(InputDefault::HAT_MASK_UP | InputDefault::HAT_MASK_DOWN);

					p_event_id = input->joy_hat(p_event_id, i, joy->dpad);
					break;

				default:
					if (joy->abs_map[ev.code] != -1) {
						InputDefault::JoyAxis value = axis_correct(libevdev_get_abs_info(dev, ev.code), ev.value);
						joy->curr_axis[joy->abs_map[ev.code]] = value;
					}
					break;
				}
				break;
			}
			rc = libevdev_next_event(dev, LIBEVDEV_READ_FLAG_NORMAL, &ev);
		}
		for (int j = 0; j < MAX_ABS; j++) {
			int index = joy->abs_map[j];
			if (index != -1) {
				p_event_id = input->joy_axis(p_event_id, i, index, joy->curr_axis[index]);
			}
		}
	}
	joy_mutex->unlock();
	return p_event_id;
}