linux簡單字元裝置驅動

2021-06-22 09:52:48 字數 1506 閱讀 4407

os：ubuntu 12.04

如果是用交叉編譯器，只需要修改makefile中的kernel所在路徑即可。

下面貼出乙個簡單的字元裝置驅動例子：

#include #include #include #include #include #include #include #define name "test"


static dev_t dev = 0;


static struct cdev *cdev;


static struct class *test_class;


static int test_open(struct inode* inode, struct file *filp)


static long test_ioctl(struct file *filp,unsigned int cmd, unsigned long argv)


return 0;


}static int test_release(struct inode* inode,struct file* filp)


static struct file_operations test_opt = 


;static int __init test_init(void)


} cdev = cdev_alloc();


cdev->ops = &test_opt;


result = cdev_add(cdev,dev,1);


if(result < 0)


test_class = class_create(this_module,name);


if(is_err(test_class))


device_create(test_class,null,dev,null,name);


return 0;


class_err:


cdev_del(cdev);


cdev_err:


unregister_chrdev_region(dev,1);


reg_err:


return -1;


}static void __exit test_exit(void)


module_init(test_init);


module_exit(test_exit);


module_license("gpl");

上面是乙個簡單的字元裝置驅動的例子。接著貼出ubunut下編譯方法： 


obj-m += test.o


all:


make -c /lib/modules/3.2.0-23-generic/build m=$(shell pwd) modules


clean:


rm *.ko *.o


編譯完成後，直接執行 


#insmod test.ko


#dmesg
如果看看是否有資訊輸出：hello test
 
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