驱动程序编写实验

实验六驱动程序编写实验一、实验目的1、掌握Linux下驱动程序开发过程2、了解驱动程序框架3、熟练使用gcc编译器4、理解makefile文件作用5、学会安装驱动程序，熟悉指令insmod，mknod，rmmod。

二、实验设备1、硬件：PC机。

2、软件：vmware虚拟机，win7/XP三、实验内容1、编写pc机下的驱动程序，并安装驱动2、编写应用程序调用驱动程序。

四、程序代码#include<linux/module.h>#include<linux/init.h>#include<linux/kernel.h>#include<linux/fs.h>#include<linux/uaccess.h>#include<linux/semaphore.h>#include<linux/cdev.h>#include<linux/device.h>#include<linux/ioctl.h>#include<linux/slab.h>#include<linux/errno.h>#include<linux/string.h>#include"hello_mod_ioctl.h"#define MAJOR_NUM250#define MINOR_NUM0#define IN_BUF_LEN256#define OUT_BUF_LEN512MODULE_AUTHOR("Tishion");MODULE_DESCRIPTION("Hello_mod driver by tishion");static struct class*hello_class;static struct cdev hello_cdev;static dev_t devnum=0;static char*modname="hello_mod";static char*devicename="hello";static char*classname="hello_class";static int open_count=0;static struct semaphore sem;static spinlock_t spin=SPIN_LOCK_UNLOCKED;static char*inbuffer=NULL;static char*outbuffer=NULL;static lang_t langtype;static int hello_mod_open(struct inode*,struct file*);static int hello_mod_release(struct inode*,struct file*);static ssize_t hello_mod_read(struct file*,char*,size_t,loff_t*);static ssize_t hello_mod_write(struct file*,const char*,size_t,loff_t*);static int hello_mod_ioctl(struct inode*,struct file*,unsigned int,unsigned long);struct file_operations hello_mod_fops={.owner=THIS_MODULE,.open=hello_mod_open,.read=hello_mod_read,.write=hello_mod_write,.ioctl=hello_mod_ioctl,.release=hello_mod_release,};static int hello_mod_open(struct inode*inode,struct file*pfile){printk("+hello_mod_open()!/n");spin_lock(&spin);if(open_count){spin_unlock(&spin);return-EBUSY;}open_count++;spin_unlock(&spin);printk("-hello_mod_open()!/n");return0;}static int hello_mod_release(struct inode*inode,struct file*pfile){printk("+hello_mod_release()!/n");open_count--;printk("-hello_mod_release()!/n");return0;}static ssize_t hello_mod_read(struct file*pfile,char*user_buf,size_t len,loff_t*o ff){printk("+hello_mod_read()!/n");if(down_interruptible(&sem)){return-ERESTARTSYS;}memset(outbuffer,0,OUT_BUF_LEN);printk("+switch()/n");switch(langtype){case english:printk(">in case:english/n");sprintf(outbuffer,"Hello!%s.",inbuffer);break;case chinese:printk(">in case:chinese/n");sprintf(outbuffer,"你好！%s.",inbuffer);break;case pinyin:printk(">in case:pinyin/n");sprintf(outbuffer,"ni hao!%s.",inbuffer);break;default:printk(">in case:default/n");break;}printk("-switch()/n");{up(&sem);return-EFAULT;}up(&sem);printk("-hello_mod_read()!/n");return0;}static ssize_t hello_mod_write(struct file*pfile,const char*user_buf,size_t len,lo ff_t*off){printk("+hello_mod_write()!/n");if(down_interruptible(&sem)){return-ERESTARTSYS;}if(len>IN_BUF_LEN){printk("Out of input buffer/n");return-ERESTARTSYS;}{up(&sem);return-EFAULT;}up(&sem);printk("-hello_mod_write()!/n");return0;}static int hello_mod_ioctl(struct inode*inode,struct file*pfile,unsigned int cmd, unsigned long arg){int err=0;printk("+hello_mod_ioctl()!/n");printk("+switch()/n");switch(cmd){case HELLO_IOCTL_RESETLANG:printk(">in case:HELLO_IOCTL_RESETLANG/n");langtype=english;break;case HELLO_IOCTL_GETLANG:printk(">in case:HELLO_IOCTL_GETLANG/n");err=copy_to_user((int*)arg,&langtype,sizeof(int));break;case HELLO_IOCTL_SETLANG:printk(">in case:HELLO_IOCTL_SETLANG/n");err=copy_from_user(&langtype,(int*)arg,sizeof(int));break;default:printk(">in case:default/n");err=ENOTSUPP;break;}printk("-switch()/n");printk("-hello_mod_ioctl()!/n");return err;}static int__init hello_mod_init(void){int result;printk("+hello_mod_init()!/n");devnum=MKDEV(MAJOR_NUM,MINOR_NUM);result=register_chrdev_region(devnum,1,modname);if(result<0){printk("hello_mod:can't get major number!/n");return result;}cdev_init(&hello_cdev,&hello_mod_fops);hello_cdev.owner=THIS_MODULE;hello_cdev.ops=&hello_mod_fops;result=cdev_add(&hello_cdev,devnum,1);if(result)printk("Failed at cdev_add()");hello_class=class_create(THIS_MODULE,classname);if(IS_ERR(hello_class)){printk("Failed at class_create().Please exec[mknod]before operate the devic e/n");}else{device_create(hello_class,NULL,devnum,NULL,devicename);}open_count=0;langtype=english;inbuffer=(char*)kmalloc(IN_BUF_LEN,GFP_KERNEL); outbuffer=(char*)kmalloc(OUT_BUF_LEN,GFP_KERNEL); init_MUTEX(&sem);printk("-hello_mod_init()!/n");return0;}static void__exit hello_mod_exit(void){printk("+hello_mod_exit!/n");kfree(inbuffer);kfree(outbuffer);cdev_del(&hello_cdev);device_destroy(hello_class,devnum);class_destroy(hello_class);unregister_chrdev_region(devnum,1);printk("-hello_mod_exit!/n");return;}module_init(hello_mod_init);module_exit(hello_mod_exit);MODULE_LICENSE("GPL");hello_mod_iotcl.h[cpp] view plaincopyprint?/**=====================================================================================**Filename:hello_mod_ioctl.h**Description:define the cmd supported by hello_mod**Version:1.0*Created:06/19/201110:24:20PM*Revision:none*Compiler:gcc**Author:Tishion(shion),tishion@*Company:LIM**================================================================== ===================*/#ifndef__HELLO_MOD_IOCTL_H__#define__HELLO_MOD_IOCTL_H__#define HELLO_MAGIC12#define HELLO_IOCTL_RESETLANG_IO(HELLO_MAGIC,0)//set langtype=engli sh#define HELLO_IOCTL_GETLANG_IOR(HELLO_MAGIC,1,int)//get langtype#define HELLO_IOCTL_SETLANG_IOW(HELLO_MAGIC,2,int)//set langtypetypedef enum_lang_t{english,chinese,pinyin}lang_t;#endifMakefile#**********************************************#Makefile linux2.6Module#This makefile is written for Ubuntu10.10#It may not perfomance without erros on the#other version or distributions.#**********************************************#BY:tishion#Mail:tishion@#2011/06/19#**********************************************obj-m+=hello_mod.oCURRENT_PATH:=$(shell pwd)LINUX_KERNEL:=$(shell uname-r)LINUX_KERNEL_PATH:=/usr/src/linux-headers-$(LINUX_KERNEL)all:make-C$(LINUX_KERNEL_PATH)M=$(CURRENT_PATH)modules clean:make-C$(LINUX_KERNEL_PATH)M=$(CURRENT_PATH)clean install:insmod hello_mod.kounistall:rmmod hello_mod附上一用户层测试文件，编译后需要root身份执行。