linux驱动自动生成设备文件名

#include <linux/types.h> //dev_t #include <linux/cdev.h> //struct cdev #include <linux/fs.h> //alloc_chrdev_region() #include <linux/device.h> //class_create() dev_t devid; static struct cdev *led_cdev; static int led_Major = 0; static int led_Minor = 0; static struct class *led_class; static struct file_operations led_fops = { .owner = THIS_MODULE, }; static int __init hello_init(void) { int err; //初始化cdev led_cdev = cdev_alloc(); cdev_init(led_cdev, &led_fops); led_cdev->owner = THIS_MODULE; //动态获取主设备号(dev_t devid中包含"主设备号"和"次设备号"信息) alloc_chrdev_region(&devid, 66, 1, "led"); led_Major = MAJOR(devid); led_Minor = MINOR(devid); printk(KERN_INFO "I was assigned major number %d.\n", led_Major); printk(KERN_INFO "I was assigned minor number %d.\n", led_Minor); //注册字符设备 (1) err = cdev_add(led_cdev, devid, 1); if (err) { printk(KERN_NOTICE "Error %d adding device\n", err); return -1; } led_class = class_create(THIS_MODULE, "led_class1"); if (IS_ERR(led_class)) { printk(KERN_INFO "create class error\n"); return -1; } device_create(led_class, NULL, devid, NULL, "led" "%d", MINOR(devid)); return 0; } static void __exit hello_exit(void) { unregister_chrdev_region(devid, 1); cdev_del(led_cdev); device_destroy(led_class, devid); class_destroy(led_class); } module_init(hello_init); module_exit(hello_exit); MODULE_LICENSE("GPL"); MODULE_AUTHOR("zengxiaolong "); MODULE_DESCRIPTION("A sample driver"); MODULE_SUPPORTED_DEVICE("testdevice");