arm学习-stm32-驱动开发-udev机制创建设备节点-ioctl实现LED灯亮灭，马达，蜂鸣器，风扇启动

head.h

#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
//开关灯 ioctl三参设置
#define LED_ON _IOW('l',1,int)
#define LED_OFF _IOW('l',0,int)

#define PHY_MD_ADDR 0X50007000
//马达开关
#define MD_ON _IO('d',1)
#define MD_OFF _IO('d',0)

#define PHY_FM_ADDR 0X50003000
//蜂鸣器开关
#define FM_ON _IO('m',1)
#define FM_OFF _IO('m',0)

#define PHY_F_ADDR 0X50006000
//风扇开关
#define F_ON _IO('f',1)
#define F_OFF _IO('f',0)

#endif 

风扇驱动
myf.c

#include 
#include 
#include 
#include 
#include 
#include "head.h"

int major;
char kbuf[128] = {0};
gpio_t *vir_f;
unsigned int *vir_rcc;
struct class *cls;
struct device *dev;
int mycdev_open(struct inode *inode, struct file *file)
{
    printk("%s:%s:%d\n", __FILE__, __func__, __LINE__);
    return 0;
}
long mycdev_ioctl(struct file *file, unsigned int cmd, unsigned long arg){
    switch (cmd)
    {
    case F_OFF:
       vir_f->ODR &=(~(0x1 << 9));
        break;
    case F_ON:
        vir_f->ODR |=(0x1 << 9);
        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,
    .unlocked_ioctl = mycdev_ioctl,
    .release = mycdev_close,
};

int all_led_init(void)
{
    // 寄存器地址的映射
    vir_f = ioremap(PHY_F_ADDR, sizeof(gpio_t));
    if (vir_f == 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
    vir_rcc = ioremap(PHY_RCC_ADDR, 4);
    if (vir_rcc == NULL)
    {
        printk("ioremap filed：%d\n", __LINE__);
        return -ENOMEM;
    }
    // rcc
    (*vir_rcc) |= (0x1 << 4);
    // 
    vir_f->MODER &= (~(3 << 18));
    vir_f->MODER |= (1 << 18);
    vir_f->OSPEEDR &= (~(3 << 18));
    vir_f->OSPEEDR |= (1 << 19);
    vir_f->ODR &= (~(1 << 9));
    printk("寄存器初始化成功\n");

    return 0;
}

static int __init mycdev_init(void)
{
    int i=0;
    // 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);
    // 向上提交目录
   cls = class_create(THIS_MODULE,"myf");
   if(IS_ERR(cls)){
        printk("向上提交失败\n");
        return -PTR_ERR(cls);
   }
   printk("向上提交成功\n");
    // 向上提交设备节点信息
  
    dev = device_create(cls,NULL,MKDEV(major,i),NULL,"myf%d",i);
    if(IS_ERR(dev)){
        printk("向上提交设备节点失败\n");
        return -PTR_ERR(dev);
    }
   
   printk("向上提交设备节点成功\n");
    // 寄存器映射以及初始化
    all_led_init();

    return 0;
}
static void __exit mycdev_exit(void)
{
    // 取消地址映射
    iounmap(vir_f);
    iounmap(vir_rcc);
    //销毁节点信息
    int i=0;
    device_destroy(cls,MKDEV(major,i));
    //销毁目录信息
    class_destroy(cls);
    // 注销字符设备驱动
    unregister_chrdev(major, "mychrdev");
}
module_init(mycdev_init);
module_exit(mycdev_exit);
MODULE_LICENSE("GPL");

风扇控制文件
test.c

#include
#include
#include 
#include 
#include 
#include
#include
#include
#include"head.h"

int main(int argc, char const *argv[])
{
    int a;
    char buf[128]={0};
    int fd=open("/dev/myf0",O_RDWR);
    if(fd<0)
    {
        printf("打开设备文件失败\n");
        exit(-1);
    }
    while(1)
    {
        //从终端读取
        printf("0(关风扇) 1(开风扇)\n");
        printf("请输入>");
        scanf("%d",&a);
        switch (a)
        {
        case 0:
            ioctl(fd,F_OFF);
            break;
        case 1:
            ioctl(fd,F_ON);
            break;
        }
    }
    close(fd);
    return 0;
}

蜂鸣器驱动文件
myfm.c

#include 
#include 
#include 
#include 
#include 
#include "head.h"

int major;
char kbuf[128] = {0};
gpio_t *vir_fm;
unsigned int *vir_rcc;
struct class *cls;
struct device *dev;
int mycdev_open(struct inode *inode, struct file *file)
{
    printk("%s:%s:%d\n", __FILE__, __func__, __LINE__);
    return 0;
}
long mycdev_ioctl(struct file *file, unsigned int cmd, unsigned long arg){
    switch (cmd)
    {
    case FM_OFF:
       vir_fm->ODR &=(~(0x1 << 6));
        break;
    case FM_ON:
        vir_fm->ODR |=(0x1 << 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,
    .unlocked_ioctl = mycdev_ioctl,
    .release = mycdev_close,
};

int all_led_init(void)
{
    // 寄存器地址的映射
    vir_fm = ioremap(PHY_FM_ADDR, sizeof(gpio_t));
    if (vir_fm == 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
    vir_rcc = ioremap(PHY_RCC_ADDR, 4);
    if (vir_rcc == NULL)
    {
        printk("ioremap filed：%d\n", __LINE__);
        return -ENOMEM;
    }
    // rcc
    (*vir_rcc) |= (0x1 << 1);
    // 
    vir_fm->MODER &= (~(3 << 12));
    vir_fm->MODER |= (1 << 12);
    vir_fm->ODR &= (~(1 << 6));
    printk("寄存器初始化成功\n");

    return 0;
}

static int __init mycdev_init(void)
{
    int i=0;
    // 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);
    // 向上提交目录
   cls = class_create(THIS_MODULE,"myfm");
   if(IS_ERR(cls)){
        printk("向上提交失败\n");
        return -PTR_ERR(cls);
   }
   printk("向上提交成功\n");
    // 向上提交设备节点信息
  
    dev = device_create(cls,NULL,MKDEV(major,i),NULL,"myfm%d",i);
    if(IS_ERR(dev)){
        printk("向上提交设备节点失败\n");
        return -PTR_ERR(dev);
    }
   
   printk("向上提交设备节点成功\n");
    // 寄存器映射以及初始化
    all_led_init();

    return 0;
}
static void __exit mycdev_exit(void)
{
    // 取消地址映射
    iounmap(vir_fm);
    iounmap(vir_rcc);
    //销毁节点信息
    int i=0;
    device_destroy(cls,MKDEV(major,i));
    //销毁目录信息
    class_destroy(cls);
    // 注销字符设备驱动
    unregister_chrdev(major, "mychrdev");
}
module_init(mycdev_init);
module_exit(mycdev_exit);
MODULE_LICENSE("GPL");

蜂鸣器控制文件
test.c

#include
#include
#include 
#include 
#include 
#include
#include
#include
#include"head.h"

int main(int argc, char const *argv[])
{
    int a;
    char buf[128]={0};
    int fd=open("/dev/myfm0",O_RDWR);
    if(fd<0)
    {
        printf("打开设备文件失败\n");
        exit(-1);
    }
    while(1)
    {
        //从终端读取
        printf("0(关蜂鸣器) 1(开蜂鸣器)\n");
        printf("请输入>");
        scanf("%d",&a);
        switch (a)
        {
        case 0:
            ioctl(fd,FM_OFF);
            break;
        case 1:
            ioctl(fd,FM_ON);
            break;
        }
    }

    
    close(fd);

    return 0;
}

led灯点亮熄灭

#include 
#include 
#include 
#include 
#include 
#include "head.h"

int major;
char kbuf[128] = {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)
{
    printk("%s:%s:%d\n", __FILE__, __func__, __LINE__);
    return 0;
}

long mycdev_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
    switch (cmd)
    {
    case LED_ON:
        switch (arg)
        {
        case 1:                           // LED1
            vir_led1->ODR |= (0x1 << 10); // LED1开灯
            break;
        case 2:                           // LED2
            vir_led2->ODR |= (0x1 << 10); // LED2开灯
            break;
        case 3:                          // LED3
            vir_led3->ODR |= (0x1 << 8); // LED3开灯
            break;
        }

        break;
    case LED_OFF:
        switch (arg)
        {
        case 1:
            vir_led1->ODR &= (~(0X1 << 10));
            break;
        case 2:
            vir_led2->ODR &= (~(0X1 << 10));
            break;
        case 3:
            vir_led3->ODR &= (~(0X1 << 8));
            break;
        }

        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,
    .unlocked_ioctl = mycdev_ioctl,
    .release = mycdev_close,
};

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("寄存器初始化成功\n");

    return 0;
}

static int __init mycdev_init(void)
{
    int i;
    // 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);
    // 向上提交目录
   cls = class_create(THIS_MODULE,"myled");
   if(IS_ERR(cls)){
        printk("向上提交失败\n");
        return -PTR_ERR(cls);
   }
   printk("向上提交成功\n");
    // 向上提交设备节点信息
   for(i=0;i<3;i++){
    dev = device_create(cls,NULL,MKDEV(major,i),NULL,"myled%d",i);
    if(IS_ERR(dev)){
        printk("向上提交设备节点失败\n");
        return -PTR_ERR(dev);
    }
   }
   printk("向上提交设备节点成功\n");
    // 寄存器映射以及初始化
    all_led_init();

    return 0;
}
static void __exit mycdev_exit(void)
{
    // 取消地址映射
    iounmap(vir_led1);
    iounmap(vir_led2);
    iounmap(vir_rcc);
    //销毁节点信息
    int i;
    for(i=0;i<3;i++)
    {
        device_destroy(cls,MKDEV(major,i));
    }
    //销毁目录信息
    class_destroy(cls);
    // 注销字符设备驱动
    unregister_chrdev(major, "mychrdev");
}
module_init(mycdev_init);
module_exit(mycdev_exit);
MODULE_LICENSE("GPL");

led灯控制文件
test.c

#include
#include
#include 
#include 
#include 
#include
#include
#include
#include"head.h"

int main(int argc, char const *argv[])
{
    char buf[128]={0};
    int fd=open("/dev/myled0",O_RDWR);
    if(fd<0)
    {
        printf("打开设备文件失败\n");
        exit(-1);
    }
    int a,b;
    while(1)
    {
        //从终端读取
        printf("0(关灯) 1(开灯)\n");
        printf("请输入>"); 
        scanf("%d",&a);
        printf("1(LED1) 2(LED2) 3(LED3)\n");
        printf("请输入>"); 
        scanf("%d",&b);
        switch (a)
        {
        case 0:
            ioctl(fd,LED_OFF,b);
            break;
        
       case 1:
            ioctl(fd,LED_ON,b);
            break;
        }
       
    }

    
    close(fd);

    return 0;
}

马达驱动文件
mymd.c

#include 
#include 
#include 
#include 
#include 
#include "head.h"

int major;
char kbuf[128] = {0};
gpio_t *vir_md;
unsigned int *vir_rcc;
struct class *cls;
struct device *dev;
int mycdev_open(struct inode *inode, struct file *file)
{
    printk("%s:%s:%d\n", __FILE__, __func__, __LINE__);
    return 0;
}
long mycdev_ioctl(struct file *file, unsigned int cmd, unsigned long arg){
    switch (cmd)
    {
    case MD_OFF:
       vir_md->ODR &=(~(0x1 << 6));
        break;
    case MD_ON:
        vir_md->ODR |=(0x1 << 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,
    .unlocked_ioctl = mycdev_ioctl,
    .release = mycdev_close,
};

int all_led_init(void)
{
    // 寄存器地址的映射
    vir_md = ioremap(PHY_MD_ADDR, sizeof(gpio_t));
    if (vir_md == 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
    vir_rcc = ioremap(PHY_RCC_ADDR, 4);
    if (vir_rcc == NULL)
    {
        printk("ioremap filed：%d\n", __LINE__);
        return -ENOMEM;
    }
    // rcc
    (*vir_rcc) |= (0x1 << 5);
    // led1
    vir_md->MODER &= (~(3 << 12));
    vir_md->MODER |= (1 << 12);
    vir_md->OSPEEDR &= (~(3 << 12));
    vir_md->OSPEEDR |= (1 << 13);
    vir_md->ODR &= (~(1 << 6));
    printk("寄存器初始化成功\n");

    return 0;
}

static int __init mycdev_init(void)
{
    int i=0;
    // 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);
    // 向上提交目录
   cls = class_create(THIS_MODULE,"mymd");
   if(IS_ERR(cls)){
        printk("向上提交失败\n");
        return -PTR_ERR(cls);
   }
   printk("向上提交成功\n");
    // 向上提交设备节点信息
  
    dev = device_create(cls,NULL,MKDEV(major,i),NULL,"mymd%d",i);
    if(IS_ERR(dev)){
        printk("向上提交设备节点失败\n");
        return -PTR_ERR(dev);
    }
   
   printk("向上提交设备节点成功\n");
    // 寄存器映射以及初始化
    all_led_init();

    return 0;
}
static void __exit mycdev_exit(void)
{
    // 取消地址映射
    iounmap(vir_md);
    iounmap(vir_rcc);
    //销毁节点信息
    int i=0;
    device_destroy(cls,MKDEV(major,i));
    //销毁目录信息
    class_destroy(cls);
    // 注销字符设备驱动
    unregister_chrdev(major, "mychrdev");
}
module_init(mycdev_init);
module_exit(mycdev_exit);
MODULE_LICENSE("GPL");

马达控制文件
test.c

#include
#include
#include 
#include 
#include 
#include
#include
#include
#include"head.h"

int main(int argc, char const *argv[])
{
    int a;
    char buf[128]={0};
    int fd=open("/dev/mymd0",O_RDWR);
    if(fd<0)
    {
        printf("打开设备文件失败\n");
        exit(-1);
    }
    while(1)
    {
        //从终端读取
        printf("0(关马达) 1(开马达)\n");
        printf("请输入>");
        scanf("%d",&a);
        switch (a)
        {
        case 0:
            ioctl(fd,MD_OFF);
            break;
        case 1:
            ioctl(fd,MD_ON);
            break;
        }
    }

    
    close(fd);

    return 0;
}