Method create_device

source/MaaKWinControlUnit/Input/UInputController.cpp:372–485

}

bool UInputController::create_device()
{
    LogInfo << "Creating uinput device at" << VAR(device_node_);

    fd_ = ::open(device_node_.c_str(), O_WRONLY | O_NONBLOCK);
    if (fd_ < 0) {
        LogError << "Failed to open" << VAR(device_node_) << VAR(errno) << VAR(std::strerror(errno));
        return false;
    }

    // Enable event types
    if (ioctl(fd_, UI_SET_EVBIT, EV_KEY) < 0) {
        LogError << "Failed to set EV_KEY" << VAR(errno) << VAR(std::strerror(errno));
        ::close(fd_);
        fd_ = -1;
        return false;
    }
    if (ioctl(fd_, UI_SET_EVBIT, EV_ABS) < 0) {
        LogError << "Failed to set EV_ABS" << VAR(errno) << VAR(std::strerror(errno));
        ::close(fd_);
        fd_ = -1;
        return false;
    }
    if (ioctl(fd_, UI_SET_EVBIT, EV_REL) < 0) {
        LogWarn << "Failed to set EV_REL, relative events may not work" << VAR(errno) << VAR(std::strerror(errno));
        // Non-fatal, continue
    }
    if (ioctl(fd_, UI_SET_EVBIT, EV_SYN) < 0) {
        LogError << "Failed to set EV_SYN" << VAR(errno) << VAR(std::strerror(errno));
        ::close(fd_);
        fd_ = -1;
        return false;
    }

    // Register BTN_LEFT for pointer click support
    if (ioctl(fd_, UI_SET_KEYBIT, BTN_LEFT) < 0) {
        LogError << "Failed to set BTN_LEFT" << VAR(errno) << VAR(std::strerror(errno));
        ::close(fd_);
        fd_ = -1;
        return false;
    }

    for (int i = 0; i < 105; i++) {
        ioctl(fd_, UI_SET_KEYBIT, i);
    }

    // Register ONLY ABS_X and ABS_Y — absolute positioning axes.
    // No ABS_MT_* axes at all, so udev will NOT classify this as a touchscreen/touchpad.
    if (ioctl(fd_, UI_SET_ABSBIT, ABS_X) < 0) {
        LogError << "Failed to set ABS_X" << VAR(errno) << VAR(std::strerror(errno));
        ::close(fd_);
        fd_ = -1;
        return false;
    }
    if (ioctl(fd_, UI_SET_ABSBIT, ABS_Y) < 0) {
        LogError << "Failed to set ABS_Y" << VAR(errno) << VAR(std::strerror(errno));
        ::close(fd_);
        fd_ = -1;