【驱动开发day4作业】-Toy模板网

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【驱动开发day4作业】,驱动开发,算法

头文件代码

#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 PHY_LED1_ADDR 0X50006000
#define PHY_LED2_ADDR 0X50007000
#define PHY_LED3_ADDR 0X50006000
#define PHY_RCC_ADDR  0X50000A28
//功能码
#define LED_ON _IOW('l',1,int)
#define LED_OFF _IOW('l',0,int)

#endif

应用层代码

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

int main(int argc, char const *argv[])
{
    char buf[128] = {0};
    int a, b;
    int fd;
    while (1)
    {
        // 从终端读取
        printf("请输入要打开哪个设备>");
        printf("0:LED1 1:LED2 2:LED3\n");
        printf("请输入>");
        scanf("%d", &b);
        if (b == 0)
        {
            fd = open("/dev/mycdev0", O_RDWR);
        }
        else if (b == 1)
        {
            fd = open("/dev/mycdev1", O_RDWR);
        }
        else if (b == 2)
        {
            fd = open("/dev/mycdev2", O_RDWR);
        }

        if (fd < 0)
        {
            printf("打开设备文件失败\n");
            exit(-1);
        }

        printf("请输入指令\n");
        printf("0(关灯) 1(开灯)\n");
        printf("请输入>");
        scanf("%d", &a);
        switch (a)
        {
        case 1:
            ioctl(fd, LED_ON); // 开灯
            break;
        case 0:
            ioctl(fd, LED_OFF);
            break;
        }

        close(fd);
    }

    return 0;
}

驱动代码文章来源地址https://www.toymoban.com/news/detail-608537.html

#include <linux/init.h>
#include <linux/module.h>
#include <linux/fs.h>
#include <linux/io.h>
#include <linux/device.h>
#include <linux/uaccess.h>
#include<linux/slab.h>
#include<linux/cdev.h>
#include "head.h"

dev_t devid;
struct cdev *cdev;
unsigned int major = 500;
unsigned int minor = 0;
gpio_t *vir_led1;
gpio_t *vir_led2;
gpio_t *vir_led3;
unsigned int *vir_rcc;
struct class *cls;
struct device *dev;
int mycdev_open(struct inode *inode, struct file *file)
{
    //获取当前设备文件对应的设备号
    int which_dev = inode->i_rdev;
    //将次设备号保存到当前文件的file结构中
    file->private_data = (void *)MINOR(which_dev);
    printk("%s:%s:%d\n", __FILE__, __func__, __LINE__);
    return 0;
}
long mycdev_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
    unsigned int which_dev = (unsigned int)file->private_data; 
     switch(which_dev)
    {
        case 0:
            //LED1控制逻辑；
            if(cmd == LED_ON)
            {
                 vir_led1->ODR |= (0x1 << 10); // LED1开灯
            }
            else if(cmd == LED_OFF)
            {
                vir_led1->ODR &= (~(0X1 << 10));
            }
            break;   
        case 1:
            //LED2控制逻辑；
            if(cmd == LED_ON)
            {
                 vir_led2->ODR |= (0x1 << 10); // LED2开灯
            }
            else if(cmd == LED_OFF)
            {
                vir_led2->ODR &= (~(0X1 << 10));
            }
            break; 
        case 2:
            //LED3控制逻辑；
            if(cmd == LED_ON)
            {
                 vir_led3->ODR |= (0x1 << 8); // LED3开灯
            }
            else if(cmd == LED_OFF)
            {
                vir_led3->ODR &= (~(0X1 << 8));
            }
            break;                          
    }
    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__);
    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__);
    return 0;
}

int mycdev_close(struct inode *inode, struct file *file)
{
    printk("%s:%s:%d\n", __FILE__, __func__, __LINE__);
    return 0;
}

// 定义操作方法风扇结构体变量并赋值
struct file_operations fops = {

    .open = mycdev_open,
    .unlocked_ioctl = mycdev_ioctl,
    .release = mycdev_close,
    .read = mycdev_read,
    .write = mycdev_write,
};


// 灯的寄存器映射以及初始化
int all_led_init(void)
{
    // 寄存器地址的映射
    vir_led1 = ioremap(PHY_LED1_ADDR, sizeof(gpio_t));
    if (vir_led1 == NULL)
    {
        printk("ioremap filed：%d\n", __LINE__);
        return -ENOMEM;
    }
    vir_led2 = ioremap(PHY_LED2_ADDR, sizeof(gpio_t));
    if (vir_led2 == NULL)
    {
        printk("ioremap filed：%d\n", __LINE__);
        return -ENOMEM;
    }
    vir_led3 = vir_led1;
    vir_rcc = ioremap(PHY_RCC_ADDR, 4);
    if (vir_rcc == 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
    (*vir_rcc) |= (3 << 4);
    // 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_led1->MODER |= (1 << 16);
    vir_led1->ODR &= (~(1 << 8));
    printk("灯的寄存器初始化成功\n");

    return 0;
}





static int __init mycdev_init(void)
{
    int ret;
    // 1.申请对象空间 cdev_alloc
    cdev = cdev_alloc();
    if (cdev == NULL)
    {
        printk("申请驱动对象空间失败\n");
        ret = -EFAULT;
        goto OUT1;
    }
    printk("申请驱动对象空间成功\n");

    // 2.初始化对象  cdev_init
    cdev_init(cdev, &fops);
    // 3.申请设备号  register_chrdev_region()/alloc_chrdev_region()
    // 动态申请
    if (major == 0)
    {
        ret = alloc_chrdev_region(&devid, minor, 3, "mycdev");
        if (ret != 0)
        {
            printk("动态申请设备号失败\n");
            goto OUT2;
        }
        //统一后面的操作
        major = MAJOR(devid); //根据设备号获取主设备号
        minor = MINOR(devid);
    }
    //静态指定申请
    else
    {
        ret = register_chrdev_region(MKDEV(major,minor),3,"mycdev");
        if(ret != 0)
        {
            printk("静态指定设备号失败\n");
            goto OUT2;
        }
    }
    printk("申请设备号成功\n");
    
    // 4.注册驱动对象 cdev_add()
    ret = cdev_add(cdev, MKDEV(major,minor), 3);
    if (ret != 0)
    {
        printk("注册设备驱动对象失败\n");
        goto OUT3;
    }
    printk("注册设备驱动对象成功\n");

    // 5.向上提交目录  class_create()
    cls = class_create(THIS_MODULE, "mycdev");
    if (IS_ERR(cls))
    {
        printk("向上提交目录失败\n");
        goto OUT4;
    }
    printk("向上提交目录成功\n");

    // 6.向上提交设备信息 device_create()
    int i;
    for (i = 0; i < 3; i++)
    {
        dev = device_create(cls, NULL, MKDEV(major, i), NULL, "mycdev%d",i);
    }

    if (IS_ERR(dev))
    {
        printk("向上提交设备节点信息失败\n");
        goto OUT5;
    }
    printk("向上提交设备节点信息成功\n");


    // 灯的寄存器映射以及初始化
    all_led_init();


    return 0;
OUT5:
//将提交成功的设备信息销毁
for(--i;i>=0;i--)
{
    device_destroy(cls,MKDEV(major,i));
}
OUT4:
    class_destroy(cls);
OUT3:
    unregister_chrdev_region(MKDEV(major,minor), 3);
OUT2:
    kfree(cdev);
OUT1:
    return ret;
}

static void __exit mycdev_exit(void)
{
    // 取消地址映射
    iounmap(vir_led1);
    iounmap(vir_led2);
    iounmap(vir_rcc);
    // 1.销毁设备信息  device_destroy
    int i;
    for(i=0;i<3;i++)
    {
        device_destroy(cls,MKDEV(major,i));
    }
    // 2.销毁目录    class_destroy
    class_destroy(cls);
    // 3.注销驱动对象  cdev_del
    cdev_del(cdev);
    // 4.释放设备号   unregister_chrdev_region()
    unregister_chrdev_region(MKDEV(major,minor),3);

    // 5.释放对象空间   kfree()
    kfree(cdev);
}
module_init(mycdev_init);
module_exit(mycdev_exit);
MODULE_LICENSE("GPL");

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