HIDIOCGRDESCSIZE
case HIDIOCGRDESCSIZE:
res = ioctl(fd, HIDIOCGRDESCSIZE, &desc_size);
err = ioctl(self->hidraw_fd, HIDIOCGRDESCSIZE, &desc_size);
err = ioctl(self->hidraw_fd, HIDIOCGRDESCSIZE, &desc_size);
err = ioctl(self->hidraw_fd, HIDIOCGRDESCSIZE, &desc_size);