3  * linux/drivers/char/misc.c
5  * Generic misc open routine by Johan Myreen
15  * of the misc drivers, as they are now completely independent. Linus.
24  * Renamed to misc and miscdevice to be more accurate. Alan Cox 26-Mar-96
159  *	@misc: device structure
175 int misc_register(struct miscdevice *misc)  in misc_register()  argument
179 	bool is_dynamic = (misc->minor == MISC_DYNAMIC_MINOR);  in misc_register()
181 	INIT_LIST_HEAD(&misc->list);  in misc_register()
192 		misc->minor = DYNAMIC_MINORS - i - 1;  in misc_register()
198 			if (c->minor == misc->minor) {  in misc_register()
205 	dev = MKDEV(MISC_MAJOR, misc->minor);  in misc_register()
207 	misc->this_device =  in misc_register()
208 		device_create_with_groups(misc_class, misc->parent, dev,  in misc_register()
209 					  misc, misc->groups, "%s", misc->name);  in misc_register()
210 	if (IS_ERR(misc->this_device)) {  in misc_register()
212 			int i = DYNAMIC_MINORS - misc->minor - 1;  in misc_register()
216 			misc->minor = MISC_DYNAMIC_MINOR;  in misc_register()
218 		err = PTR_ERR(misc->this_device);  in misc_register()
226 	list_add(&misc->list, &misc_list);  in misc_register()
235  *	@misc: device to unregister
241 void misc_deregister(struct miscdevice *misc)  in misc_deregister()  argument
243 	int i = DYNAMIC_MINORS - misc->minor - 1;  in misc_deregister()
245 	if (WARN_ON(list_empty(&misc->list)))  in misc_deregister()
249 	list_del(&misc->list);  in misc_deregister()
250 	device_destroy(misc_class, MKDEV(MISC_MAJOR, misc->minor));  in misc_deregister()
273 	ret = proc_create_seq("misc", 0, NULL, &misc_seq_ops);  in misc_init()
274 	misc_class = class_create(THIS_MODULE, "misc");  in misc_init()
280 	if (register_chrdev(MISC_MAJOR, "misc", &misc_fops))  in misc_init()
286 	pr_err("unable to get major %d for misc devices\n", MISC_MAJOR);  in misc_init()
290 		remove_proc_entry("misc", NULL);  in misc_init()