驱动开发第二天

头文件

#ifndef __HEAD_H__
#define __HEAD_H__
#define PHY_LED1_MODER 0x50006000
#define PHY_LED2_MODER 0x50007000
#define PHY_LED3_MODER 0x50006000
#define PHY_LED1_ODR   0x50006014
#define PHY_LED2_ODR   0x50007014
#define PHY_LED3_ODR   0x50006014
#define PHY_RCC        0x50000A28


#endif

demo.c文件

#include 
#include 
#include 
#include 
#include 
#include "head.h"
unsigned int major;
char kbuf[128]={};
//定义三个指针指向映射后的虚拟内存
unsigned int *vir_led1_moder;
unsigned int *vir_led2_moder;
unsigned int *vir_led3_moder;
unsigned int *vir_led1_odr;
unsigned int *vir_led2_odr;
unsigned int *vir_led3_odr;
unsigned int *vir_rcc;
// 封装操作方法
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__);
	int ret;
	ret=copy_to_user(ubuf,kbuf,size);
	if(ret)
	{
		printk("copy_to_user fild\n");
		return -EIO;
	}
    return 0;
}
ssize_t mycdev_write(struct file *file, const char *ubuf, size_t size, loff_t *lof)
{
	printk("%s:%s:%d\n",__FILE__,__func__,__LINE__);
	int ret;
	ret=copy_from_user(kbuf,ubuf,size);
	if(ret)
	{
		printk("copy_from_user filed\n");
		return -EIO;
	}
	if(kbuf[0]=='0')
	{
		(*vir_led1_odr)&=(~(0x1<<10));
		(*vir_led2_odr)&=(~(0x1<<10));
		(*vir_led3_odr)&=(~(0x1<<8));
	}
	else if(kbuf[0]=='1')
	{
		(*vir_led1_odr)|=(0x1<<10);
		(*vir_led2_odr)|=(0x1<<10);
		(*vir_led3_odr)|=(0x1<<8);
	}
	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对象
struct file_operations fops = {
    .open=mycdev_open,
    .read=mycdev_read,
    .write=mycdev_write,
    .release=mycdev_close,
};
static int __init mycdev_init(void)
{
    // 注册字符设备驱动
    major = register_chrdev(0, "mychrdev", &fops);
    if (major < 0)
    {
        printk("字符设备驱动注册失败\n");
        return major;
    }
    printk("注册字符设备驱动成功major=%d\n", major);
	//进行寄存器的地址映射
	vir_led1_moder = ioremap(PHY_LED1_MODER,4);
	if(vir_led1_moder==NULL)
	{
		printk("物理内存地址映射失败%d\n",__LINE__);
		return -EFAULT;
	}
	vir_led1_odr=ioremap(PHY_LED1_ODR,4);
	if(vir_led1_odr==NULL)
	{
		printk("物理内存地址映射失败%d\n",__LINE__);
		return -EFAULT;
	}	
	vir_led2_moder = ioremap(PHY_LED2_MODER,4);
	if(vir_led2_moder==NULL)
	{
		printk("物理内存地址映射失败%d\n",__LINE__);
		return -EFAULT;
	}
	vir_led2_odr=ioremap(PHY_LED2_ODR,4);
	if(vir_led2_odr==NULL)
	{
		printk("物理内存地址映射失败%d\n",__LINE__);
		return -EFAULT;
	}
	vir_led3_moder = ioremap(PHY_LED3_MODER,4);
	if(vir_led3_moder==NULL)
	{
		printk("物理内存地址映射失败%d\n",__LINE__);
		return -EFAULT;
	}
	vir_led3_odr=ioremap(PHY_LED3_ODR,4);
	if(vir_led3_odr==NULL)
	{
		printk("物理内存地址映射失败%d\n",__LINE__);
		return -EFAULT;
	}
	vir_rcc=ioremap(PHY_RCC,4);
	if(vir_rcc==NULL)
	{
		printk("物理内存地址映射失败%d\n",__LINE__);
		return -EFAULT;
	}
	printk("寄存器内存映射成功\n");
	//LED1寄存器初始化
	(*vir_rcc)|=(0x1<<4);
	(*vir_led1_moder)&=(~(0x3<<20));
	(*vir_led1_moder)|=(0x1<<20);
	(*vir_led1_odr)&=(~(0x1<<10));	
	(*vir_led2_moder)&=(~(0x3<<20));
	(*vir_led2_moder)|=(0x1<<20);
	(*vir_led2_odr)&=(~(0x1<<10));
	(*vir_led3_moder)&=(~(0x3<<16));
	(*vir_led3_moder)|=(0x1<<16);
	(*vir_led3_odr)&=(~(0x1<<8));
    return 0;
}
static void __exit mycdev_exit(void)
{
	//取消内存映射
	iounmap(vir_led1_moder);
	iounmap(vir_led1_odr);
	iounmap(vir_led2_moder);
	iounmap(vir_led2_odr);
	iounmap(vir_led3_moder);
	iounmap(vir_led3_odr);
	iounmap(vir_rcc);
    //注销字符设备驱动
    unregister_chrdev(major,"mychrdev");
}
module_init(mycdev_init);
module_exit(mycdev_exit);
MODULE_LICENSE("GPL");