字符设备驱动结构

/* SPDX-License-Identifier: GPL-2.0 */#ifndef _LINUX_CDEV_H#define _LINUX_CDEV_H
#include <linux/kobject.h>#include <linux/kdev_t.h>#include <linux/list.h>#include <linux/device.h>
struct file_operations;struct inode;struct module;
struct cdev {	struct kobject kobj;	struct module *owner;	const struct file_operations *ops;	struct list_head list;	dev_t dev;	unsigned int count;} __randomize_layout;
void cdev_init(struct cdev *, const struct file_operations *);
struct cdev *cdev_alloc(void);
void cdev_put(struct cdev *p);
int cdev_add(struct cdev *, dev_t, unsigned);
void cdev_set_parent(struct cdev *p, struct kobject *kobj);int cdev_device_add(struct cdev *cdev, struct device *dev);void cdev_device_del(struct cdev *cdev, struct device *dev);
void cdev_del(struct cdev *);
void cd_forget(struct inode *);
#endif

struct kobject {	const char		*name;	struct list_head	entry;	struct kobject		*parent;	struct kset		*kset;	const struct kobj_type	*ktype;	struct kernfs_node	*sd; /* sysfs directory entry */	struct kref		kref;#ifdef CONFIG_DEBUG_KOBJECT_RELEASE	struct delayed_work	release;#endif	unsigned int state_initialized:1;	unsigned int state_in_sysfs:1;	unsigned int state_add_uevent_sent:1;	unsigned int state_remove_uevent_sent:1;	unsigned int uevent_suppress:1;};

alloc_chrdev_region

register_chrdev_region

extern int alloc_chrdev_region(dev_t *, unsigned, unsigned, const char *);extern int register_chrdev_region(dev_t, unsigned, const char *);

extern void unregister_chrdev_region(dev_t, unsigned);