GNSS_MINORS
id = ida_alloc_max(&gnss_minors, GNSS_MINORS - 1, GFP_KERNEL);
ret = alloc_chrdev_region(&gnss_first, 0, GNSS_MINORS, "gnss");
unregister_chrdev_region(gnss_first, GNSS_MINORS);
unregister_chrdev_region(gnss_first, GNSS_MINORS);