22071驱动day5

1.在串口工具进行输入：
    echo 1 > /dev/myled0 ---->led1灯点亮
    echo 0 > /dev/myled0 ---->led1灯熄灭
    echo 1 > /dev/myled1 ---->led1灯点亮
    echo 0 > /dev/myled1 ---->led1灯熄灭
    echo 1 > /dev/myled2 ---->led1灯点亮
    echo 0 > /dev/myled2 ---->led1灯熄灭

#include <linux/init.h>
#include <linux/module.h>
#include <linux/cdev.h>
#include <linux/fs.h>
#include <linux/device.h>
#include <linux/slab.h>
#include <linux/uaccess.h>
#include <linux/io.h>
#include "led.h"#define CNAME "myled"struct cdev* cdev;
struct class *cls;
struct device* dev;#if 1
unsigned int major=0;
#else
unsigned int majo=500;
#endif
int minor=0;
const int count=3;
char kbuf;volatile unsigned int* virt_rcc;
volatile gpio_t* virt_gpioe;
volatile gpio_t* virt_gpiof;int mycdev_open(struct inode *inode,struct file *file)
{dev_t i_rdev;dev_t i_minor;i_rdev=inode->i_rdev;                        //获取设备号i_minor = MINOR(i_rdev);                       //获取次设备号file->private_data = (void*)i_minor;           //私有数据传参printk("%s:%s:%d\n",__FILE__,__func__,__LINE__);return 0;
}ssize_t mycdev_read(struct file *file, char __user *ubuf, size_t size, loff_t *loffs)
{printk("%s:%s:%d\n",__FILE__,__func__,__LINE__);return 0;
}
ssize_t mycdev_write(struct file *file, const char __user *ubuf, size_t size, loff_t *loffs)
{int ret;if(size > sizeof(kbuf)) size = sizeof(kbuf);ret = copy_from_user(&kbuf,ubuf,size);minor=0;minor = (int)file->private_data;   //私有数据传参if(minor == 0)                     //操作灯1 PE10{if(kbuf == '1'){virt_gpioe->ODR |= (0x1 << 10); //led1输出高电平}else if(kbuf == '0'){virt_gpioe->ODR &= (~(0x1 << 10));//led1输出低电平}}else if(minor == 1) //操作灯2 PF10{if(kbuf == '1'){virt_gpiof->ODR |= (0x1 << 10); //led2输出高电平}else if(kbuf == '0'){virt_gpiof->ODR &= (~(0x1 << 10));//led2输出低电平}}else if(minor == 2)                       //操作灯3 PE8{if(kbuf == '1'){virt_gpioe->ODR |= (0x1 << 8);    //led3输出高电平}else if(kbuf == '0'){virt_gpioe->ODR &= (~(0x1 << 8)); //led3输出低电平}}//printk("%s:%s:%d\n",__FILE__,__func__,__LINE__);return 0;
}
int  mycdev_close(struct inode *inode, struct file *file)
{printk("%s:%s:%d\n",__FILE__,__func__,__LINE__);return 0;
}
const struct file_operations fops={.open=mycdev_open,.read=mycdev_read,.write=mycdev_write,.release=mycdev_close,
};//入口
static int __init mycdev_init(void)
{int ret;dev_t devno;int i;//1.分配cdev结构体cdev=cdev_alloc();if(NULL==cdev){printk("cdev alloc is error\n");ret=-EIO;goto ERR1;}//2.初始化结构体cdev_init(cdev,&fops);//3.申请设备号if(major>0){//静态指定设备号ret=register_chrdev_region(MKDEV(major,minor),count,CNAME);if(ret){printk("register chrdev region is error\n");ret = -ENOMEM;goto ERR2;}}else{//动态申请设备号ret=alloc_chrdev_region(&devno,0,count,CNAME);if(ret){printk("alloc chrdev region is error\n");ret = -ENOMEM;goto ERR2;}//获取主设备号major=MAJOR(devno);//获取次设备号minor=MINOR(devno);}//4.驱动的注册ret=cdev_add(cdev,MKDEV(major,minor),count);if(ret){printk("cdev add is error\n");ret = -EIO;goto ERR3;}//5.自动创建设备节点//向上层提交目录信息cls=class_create(THIS_MODULE,CNAME);if(IS_ERR(cls)){printk("class create is error\n");ret=PTR_ERR(cls);goto ERR4;}//向上层提交设备节点信息for(i=0;i<count;i++){dev=device_create(cls,NULL,MKDEV(major,i),NULL,"myled%d",i);if(IS_ERR(dev)){printk("device create is error\n");ret=PTR_ERR(dev);goto ERR5;}}//2.将GPIOE和GPIOF物理地址映射为虚拟地址//1)将rcc地址进行映射virt_rcc = ioremap(PHY_RCC,4);if(NULL == virt_rcc){printk("rcc ioremap is error\n");return -ENOMEM;}//2)将GPIOE物理地址进行映射virt_gpioe = ioremap(GPIOE,sizeof(gpio_t));if(NULL == virt_gpioe){printk("gpio moder ioremap is error\n");return -ENOMEM;}//3)将GPIOF物理地址进行映射virt_gpiof = ioremap(GPIOF,sizeof(gpio_t));if(NULL == virt_gpiof){printk("gpio odr ioremap is error\n");return -ENOMEM;}//PE10----->LED1初始化*virt_rcc |= (0x1 << 4); //设置GPIOE组时钟使能virt_gpioe->MODER &= (~(0x3 << 20)); //设置PE10引脚为输出模式virt_gpioe->MODER |= (0x1  << 20);virt_gpioe->ODR &= (~(0x1 << 10)); //设置灯的初始化默认为低电平//PF10----->LED2初始化*virt_rcc |= (0x1 << 5); //设置GPIOF组时钟使能virt_gpiof->MODER &= (~(0x3 << 20)); //设置PF10引脚为输出模式virt_gpiof->MODER |= (0x1  << 20);virt_gpiof->ODR &= (~(0x1 << 10)); //设置灯的初始化默认为低电平//PE8----->LED3初始化virt_gpioe->MODER &= (~(0x3 << 16)); //设置PE8引脚为输出模式virt_gpioe->MODER |= (0x1  << 16);virt_gpioe->ODR &= (~(0x1 << 8)); //设置灯的初始化默认为低电平return 0;ERR5:for(--i;i>=0;i--){device_destroy(cls,MKDEV(major,i));}class_destroy(cls);
ERR4:cdev_del(cdev);
ERR3:unregister_chrdev_region(MKDEV(major,minor),count);
ERR2:kfree(cdev);
ERR1:return -EIO;
}
//出口
static void __exit mycdev_exit(void)
{int i;//1.销毁设备节点信息for(i=0;i<count;i++){device_destroy(cls,MKDEV(major,i));}//2.销毁目录信息class_destroy(cls);//3.驱动的注销cdev_del(cdev);//4.销毁设备号unregister_chrdev_region(MKDEV(major,minor),count);//5.释放cdev结构体kfree(cdev);
}
//指定入口地址
module_init(mycdev_init);
module_exit(mycdev_exit);
//指定出口地址
//许可证
MODULE_LICENSE("GPL");

#ifndef __LED_H__
#define __LED_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;
}gpio_t;
#define GPIOE 0x50006000
#define GPIOF 0x50007000
#define PHY_RCC   0x50000A28#endif

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