Linux Kernel input 子系统初始化

static int __init input_init(void) { int err; err = class_register(&input_class); if (err) { pr_err("unable to register input_dev class\n"); return err; } err = input_proc_init(); if (err) goto fail1; err = register_chrdev_region(MKDEV(INPUT_MAJOR, 0),     INPUT_MAX_CHAR_DEVICES, "input"); if (err) { pr_err("unable to register char major %d", INPUT_MAJOR); goto fail2; } return 0;  fail2: input_proc_exit();  fail1: class_unregister(&input_class); return err; } static void __exit input_exit(void) { input_proc_exit(); unregister_chrdev_region(MKDEV(INPUT_MAJOR, 0), INPUT_MAX_CHAR_DEVICES); class_unregister(&input_class); } subsys_initcall(input_init); module_exit(input_exit);