下载驱动实现三个灯蜂鸣器风扇的工作

内核.c

#include <linux/init.h>
#include <linux/module.h>
#include <linux/fs.h>
#include <linux/io.h>
#include <linux/ioctl.h>
#include <linux/device.h>
#include <linux/uaccess.h>
#include"led2.h"
#define CNAME  "mycdev"

int major;//定义变量接收主设备号
char kbuf[128]={};//定义数组用于存放和用户之间拷贝的数据
gpio_t *vir_led1;
gpio_t *vir_led2;
gpio_t *vir_led3;
gpio_t *vir_fmq;
gpio_t *vir_fs;
unsigned int *vir_rcc;
struct class *cls;//句柄
struct device *dev;
//对应的是open()
int mycdev_open(struct inode *inode, struct file *file)
{
      printk("%s:%s:%d\n",__FILE__,__func__,__LINE__);
      return 0;
}
//read()
ssize_t mycdev_read(struct file *file, char __user *ubuf, size_t size, loff_t *loff)
{
    //size参数是用户期待读到的字节长度
    int ret;
    if(size>sizeof(kbuf))
    size=sizeof(kbuf);
    ret=copy_to_user(ubuf,kbuf,size);
    if(ret)
    {
        printk("数据从内核向用户拷贝失败\n");
        return -EIO;
    }
     
       return size;
}
//write()
ssize_t mycdev_write(struct file *file, const char __user *ubuf, size_t size, loff_t *loff)
{
    int ret;
    if(size>sizeof(kbuf))
    size=sizeof(kbuf);
    ret=copy_from_user(kbuf,ubuf,size);
    if(ret)
    {
        printk("数据从内核向用户拷贝失败\n");
        return -EIO;
    }
    /*
    if(kbuf[0]=='1')//开灯
        vir_led1->ODR |= (1<<10);
    else if(kbuf[0]=='2')
        vir_led2->ODR |= (1 << 10);
    else if(kbuf[0]=='3')
       vir_led3->ODR |= (1 << 8);
    else//关灯
    {
        vir_led1->ODR &= ~(1<<10);
        vir_led2->ODR&= ~(1 << 10);
       vir_led3->ODR &= ~(1 << 8);
    }*/
       return size;
}
long ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
    int ret,which;
    switch(cmd)
    {
        case Ledon:
             ret=copy_from_user(&which,(void *)arg,sizeof(int));
             if(ret)
             {
                printk("用户向内核拷贝数据失败\n");
                return -EIO;
             }    
             switch(which)
             {
                case LED1:
                vir_led1->ODR |=(1<<10);
                break;
                case LED2:
                vir_led2->ODR |=(1<<10);
                break;
                case LED3:
                vir_led3->ODR |=(1<<8);
                break;
                case fengmingqi:
                vir_fmq->ODR |=(1<<6);
                break;
                case fengsan:
                vir_fs->ODR |=(1<<9);
                break;
             }
        break;
        case Ledoff:
             ret=copy_from_user(&which,(void *)arg,sizeof(int));
             if(ret)
             {
                printk("用户向内核拷贝数据失败\n");
                return -EIO;
             }
             switch(which)
             {
                case LED1:
                vir_led1->ODR &=~(1<<10);
                break;
                case LED2:
                vir_led2->ODR &=~(1<<10);
                break;
                case LED3:
                vir_led3->ODR &=~(1<<8);
                break;
                case fengmingqi:
                vir_fmq->ODR &=~(1<<6);
                break;
                case fengsan:
                vir_fs->ODR &=~(1<<9);
                break;
             }
        break;

        default:
            printk("功能码错误\n");
            break;
    }
    return 0;
}

//close()
int mycdev_close(struct inode *inode, struct file *file)
{
      printk("%s:%s:%d\n",__FILE__,__func__,__LINE__);
       return 0;
}
//操作方法结构体的初始化
struct file_operations fops=
{
    .open=mycdev_open,
    .read=mycdev_read,
    .write=mycdev_write,
    .unlocked_ioctl=ioctl,
    .release=mycdev_close,   
};
int all_led_init(void)
{
    //进行物理地址的映射
    vir_led1=ioremap(PHY_LED1_ADDR,sizeof(gpio_t));
    if(vir_led1==NULL)
    {
        printk("vir_led1 映射失败\n");
        return -ENOMEM;
    }
    printk("vir_led1 映射成功\n");
   vir_led2=ioremap(PHY_LED2_ADDR,sizeof(gpio_t));
    if(vir_led2==NULL)
    {
        printk("vir_led2 映射失败\n");
        return -ENOMEM;
    }
    printk("vir_led2 映射成功\n");
    vir_led3=ioremap(PHY_LED3_ADDR,sizeof(gpio_t));
    if(vir_led3==NULL)
    {
        printk("vir_led3 映射失败\n");
        return -ENOMEM;
    }
    printk("vir_led3 映射成功\n");
    vir_rcc=ioremap(PHY_RCC_ADDR,sizeof(gpio_t));
    if(vir_rcc==NULL)
    {
        printk("vir_rcc 映射失败\n");
        return -ENOMEM;
    }
    printk("vir_rcc 映射成功\n");

    vir_fmq=ioremap(PHY_FMQ_ADDR,sizeof(gpio_t));
    if(vir_fmq==NULL)
    {
        printk("vir_fmq 映射失败\n");
        return -ENOMEM;
    }
    printk("vir_fmq 映射成功\n");

    vir_fs=ioremap(PHY_FS_ADDR,sizeof(gpio_t));
    if(vir_fs==NULL)
    {
        printk("vir_fs 映射失败\n");
        return -ENOMEM;
    }
    printk("vir_fs 映射成功\n");
    //寄存器的初始化
    //led1
    vir_led1->MODER &= ~(3<<20);
    vir_led1->MODER |= (1<<20);
    vir_led1->ODR &= ~(1<<10);

    //led2
    vir_led2->MODER &= ~(3<<20);
    vir_led2->MODER |= (1<<20);
    vir_led2->ODR &= ~(1<<10);

    //led3
   vir_led3->MODER &= ~(3<<16);
    vir_led3->MODER |= (1<<16);
    vir_led3->ODR &= ~(1<<8);
    
    //fengmingqi
    vir_fmq->MODER &= ~(3<<12);
    vir_fmq->MODER |= (1<<12);
    vir_fmq->ODR &= ~(1<<6);

    //fengsan
    vir_fs->MODER &= ~(3<<18);
    vir_fs->MODER |= (1<<18);
    vir_fs->ODR &= ~(1<<9);

    (*vir_rcc) |= (3<<4);
    (*vir_rcc) |=(1<<1);
    return 0;
}
//入口函数，当驱动安装的时候执行
static int __init demo_init(void)
{
    
    //动态注册字符设备驱动
    major=register_chrdev(0,CNAME,&fops);
    if(major<0)
    {
        printk("字符设备驱动注册失败\n");
        return major;
    }
    printk("字符设备驱动注册成功major=%d\n",major);
    //向上提交节点目录
    cls=class_create(THIS_MODULE,"LED");
    if(IS_ERR(cls))
    {
        printk("向上提交目录失败\n");
        return PTR_ERR(cls);
    }
     printk("向上提交目录成功\n");
     //创建设备节点
     dev=device_create(cls,NULL,MKDEV(major,0),NULL,"myled");
     if(IS_ERR(dev))
     {
        printk("创建节点失败\n");
        return PTR_ERR(dev);
     }
     printk("创建节点成功\n");
    //寄存器的初始化
    all_led_init();
   
    return 0;
}

//出口函数，卸载驱动的时候执行
static void __exit demo_exit(void)
{
    //销毁节点
    device_destroy(cls,MKDEV(major,0));
    //销毁目录
    class_destroy(cls);
    //取消映射
    iounmap(vir_led1);
    iounmap(vir_led2);
    iounmap(vir_led3);
    iounmap(vir_rcc);
    iounmap(vir_fmq);
    iounmap(vir_fs);

    //注销字符设备驱动
    unregister_chrdev(major,CNAME);
   
}
module_init(demo_init);
module_exit(demo_exit);
MODULE_LICENSE("GPL");

内核.h

#ifndef __LED2_H__
#define __LED2_H__

typedef struct{
    volatile unsigned int MODER;
    volatile unsigned int OTYPER;
    volatile unsigned int OSPEEDR;
    volatile unsigned int PUPDR;
    volatile unsigned int IDR;
    volatile unsigned int ODR;
    volatile unsigned int BSRR;
}gpio_t;
#define PHY_LED1_ADDR 0X50006000
#define PHY_LED2_ADDR 0X50007000
#define PHY_LED3_ADDR   0X50006000
#define PHY_FMQ_ADDR 0X50003000
#define PHY_FS_ADDR 0X50006000
#define PHY_RCC_ADDR  0X50000A28 
enum LED
{
    LED1=1,
    LED2,
    LED3,
    fengmingqi,
    fengsan  
};

#define Ledon _IOW('a',1,int)
#define Ledoff _IOW('a',0,int)

#endif

执行.c

#include<stdio.h>
#include<sys/types.h>
#include<sys/stat.h>
#include<fcntl.h>
#include<unistd.h>
#include<stdlib.h>
#include<string.h>
#include<sys/ioctl.h>
#include"led2.h"

int main(int argc, char const *argv[])
{
    char buf[128]={};
    int fd=open("/dev/myled",O_RDWR);
    int which;
    if(fd<0)
    {
        printf("打开设备文件失败\n");
        exit(-1);
    }
    printf("设备文件打开成功\n");
    //在终端输入
    while(1)
    {
    printf("请输入控制命令3：1开 0：关\n");
    fgets(buf,sizeof(buf),stdin);
    printf("请输入要操作：1->led1 2->led2 3->led3 4->fengmingqi 5->fengsan");
    scanf("%d",&which);
    getchar();
    //吃掉换行符
    buf[strlen(buf)-1]='\0';
    if(buf[0]=='1')
    {
    ioctl(fd,Ledon,&which);
    }    
    else
    {
        ioctl(fd,Ledoff,&which);
    }
    }
    close(fd);
    return 0;
}