三盏灯的驱动 要求编写应用程序测试发布CSDN

#include 
#include 
#include
#include
#include"head.h"
 
int major;
char kbuf[128]={0};
gpio_t *vaddr;
gpio_t *vaddr2;
gpio_t *vaddr3;
gpio_t *vbee;
gpio_t *vfan;
unsigned int *vrcc;
int mycdev_open(struct inode *inode, struct file *file)
{
    printk("%s:%s:%d\n",__FILE__,__func__,__LINE__);
    return 0;
}
ssize_t mycdev_read(struct file *file, char  *ubuf, size_t size, loff_t *lof)
{
    printk("%s:%s:%d\n",__FILE__,__func__,__LINE__);
     unsigned long ret;
    //向用户空间读取拷贝
    if(size>sizeof(kbuf))//用户空间期待读取的大小内核满足不了，那就给内核支持的最大大小
        size=sizeof(kbuf);
    ret=copy_to_user(ubuf,kbuf,size);
    if(ret)//拷贝失败
    {
        printk("copy_to_user filed\n");
        return ret;
    }
    return 0;
}
ssize_t mycdev_write(struct file *file, const char  *ubuf, size_t size, loff_t *lof)
{
    unsigned long ret;
    //从用户空间读取数据
    if(size>sizeof(kbuf))//用户空间期待读取的大小内核满足不了，那就给内核支持的最大大小
        size=sizeof(kbuf);
    ret=copy_from_user(kbuf,ubuf,size);
    if(ret)//拷贝失败
    {
        printk("copy_to_user filed\n");
        return ret;
    }
    switch(kbuf[0])
    {
        case '1':
            if(kbuf[1]=='0')//关灯
            {
                vaddr->odr &= (~(1<<10));
            }
            else
            {
                vaddr->odr |= 1<<10;
            }
            break;
        case '2':
            if(kbuf[1]=='0')//关灯
            {
                vaddr2->odr &= (~(1<<10));
            }
            else
            {
                vaddr2->odr |= 1<<10;         
            }
            break;
        case '3':
            if(kbuf[1]=='0')//关灯
            {
                vaddr3->odr &= (~(1<<8));
            }
            else
            {
                vaddr3->odr |= 1<<8;
            }
            break;
        case '4':
            if(kbuf[1]=='0')//关灯
            {
                vfan->odr &= (~(1<<9));
            }
            else
            {
                vfan->odr |= 1<<9;
            }
            break;
        case '5':
            if(kbuf[1]=='0')//关灯
            {
               vbee->odr &= (~(1<<6));
            }
            else
            {
                vbee->odr |= 1<<6;
            }
            break;
 
    }
    return 0;
}
int mycdev_close(struct inode *inode, struct file *file)
{
    printk("%s:%s:%d\n",__FILE__,__func__,__LINE__);
    return 0;
}
 
//定义操作方法结构体变量并赋值
struct file_operations fops={
 
    .open=mycdev_open,
    .read=mycdev_read,
    .write=mycdev_write,
    .release=mycdev_close,
};
static int __init mycdev_init(void)
{
    //字符设备驱动注册
    major=register_chrdev(0,"mychrdev",&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);
    //寄存器地址的映射
    //led1
    vaddr=ioremap(GPIO_E,sizeof(gpio_t));
    if(vaddr==NULL)
    {
        printk("ioremap filed：%d\n",__LINE__);
        return -ENOMEM;
    }
    //led2
    vaddr2=ioremap(GPIO_F,sizeof(gpio_t));
    if(vaddr2==NULL)
    {
        printk("ioremap filed：%d\n",__LINE__);
        return -ENOMEM;
    }
    //led3
    vaddr3=ioremap(GPIO_E,sizeof(gpio_t));
    if(vaddr3==NULL)
    {
        printk("ioremap filed：%d\n",__LINE__);
        return -ENOMEM;
    }
    //风扇地址
    vfan=ioremap(GPIO_E,sizeof(gpio_t));
    if(vfan==NULL)
    {
        printk("ioremap filed：%d\n",__LINE__);
        return -ENOMEM;
    }
    //蜂鸣器地址
    vbee=ioremap(GPIO_B,sizeof(gpio_t));
    if(vbee==NULL)
    {
        printk("ioremap filed：%d\n",__LINE__);
        return -ENOMEM;
    }
    //RCC地址
    vrcc=ioremap(PHY_RCC,4);
    if(vaddr==NULL)
    {
        printk("ioremap filed：%d\n",__LINE__);
        return -ENOMEM;
    }
    printk("物理地址映射成功\n");
    //寄存器的初始化
    //rcc
    (*vrcc) |= (1<<4);
    (*vrcc) |= (1<<5);
    (*vrcc) |= (1<<1);
    //moder
    //led1
    vaddr->moder &= (~(3<<20));
    vaddr->moder |= (1<<20);
    //odr输出低电平
    vaddr->odr &= (~(1<<10));
 
    //led2
    vaddr2->moder &= (~(3<<20));
    vaddr2->moder |= (1<<20);
    //odr输出低电平
    vaddr2->odr &= (~(1<<10));
 
    //led3
    vaddr3->moder &= (~(3<<16));
    vaddr3->moder |= (1<<16);
    //odr输出低电平
    vaddr3->odr &= (~(1<<18));
 
    //风扇
    vfan->moder &= (~(3<<18));
    vfan->moder |= (1<<18);
    //odr输出低电平
    vfan->odr &= (~(1<<9));
 
    //蜂鸣器
    vbee->moder &= (~(3<<12));
    vbee->moder |= (1<<12);
    //odr输出低电平
    vbee->odr &= (~(1<<6));
 
    return 0;
}
static void __exit mycdev_exit(void)
{
     //取消地址映射
    iounmap(vaddr);
    iounmap(vaddr2);
    iounmap(vaddr3);
    iounmap(vfan);
    iounmap(vbee);
    iounmap(vrcc);
    //注销字符设备驱动
    unregister_chrdev(major,"mychrdev");
 
}
module_init(mycdev_init);
module_exit(mycdev_exit);
MODULE_LICENSE("GPL");

#ifndef __HEAD_H__
#define __HEAD_H__
typedef struct
{
    unsigned int moder;
    unsigned int otyper;
    unsigned int ospeedr;
    unsigned int pupdr;
    unsigned int idr;
    unsigned int odr;
 
}gpio_t;
#define GPIO_B 0x50003000
#define GPIO_E 0x50006000
#define GPIO_F 0x50007000
#define PHY_RCC 0x50000A28
#define PHY_BEE ((gpio_t *)GPIO_B)
#define PHY_FAN ((gpio_t *)GPIO_E)
#define PHY_LED1 ((gpio_t *)GPIO_E)
#define PHY_LED2 ((gpio_t *)GPIO_F)
#define PHY_LED3 ((gpio_t *)GPIO_E)
 
 
#endif