上海华清071班

驱动.c文件

#include <linux/init.h>
#include <linux/module.h>
#include <linux/fs.h>
#include <linux/uaccess.h>
#include <linux/io.h>
#include <linux/device.h>
#include <linux/ioctl.h> 
#include "text.h"
#define CNAME "myled"
 
int major;
char kbuf[128]={0};
struct  class *cls;
struct device *dev; 
int rets;
int ret;
image_t image;
 
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)
{
    printk("%s:%s:%d\n",__FILE__,__func__,__LINE__);
    switch(cmd)
    {
    case UACCESS_BUF:
    rets=copy_from_user(kbuf,(char*)arg,sizeof(char [128]));
    if(rets)
    {
        printk("copy form user led on\n");
        return -EIO;
    }
      printk("copy form user kbuf=%s\n",kbuf);
    case UACCESS_IMAGE:
    ret=copy_from_user(&image,(image_t*)arg,sizeof(image_t));
    if(ret)
    {
        printk("copy form user led on\n");
        return -EIO;
    }
    printk("width=%d   high=%d\n",image.width,image.high);
    image.width+=10;
    image.high+=10;
    ret=copy_to_user((image_t*)arg,&image,sizeof(image_t));
    if(ret)
    {
        printk("copy form user led on\n");
        return -EIO;
    }
    
    }
    return 0;
}
int mycdev_release(struct inode *inode, struct file *file)
{
    printk("%s:%s:%d\n",__FILE__,__func__,__LINE__);
    return 0;
}
 
const struct file_operations fops={
    .open = mycdev_open,
    .unlocked_ioctl = mycdev_ioctl,
    .release = mycdev_release,
 
};
 
static int __init mycdev_init(void)
{
    major=register_chrdev(0,CNAME,&fops);
    if(major<0)
    {
        printk("error\n");
        return major;
    }
    cls=class_create(THIS_MODULE,CNAME);
    if(IS_ERR(cls))
    {
        printk("error\n");
        return PTR_ERR(cls);
    }
    dev=device_create(cls,NULL,MKDEV(major,0),NULL,CNAME);
    if(IS_ERR(dev))
    {
        printk("error\n");
        return PTR_ERR(dev);
    }
    
 
    printk("major=%d\n",major);
    return 0;
}
static void __exit mycdev_exit(void)
{
    device_destroy(cls,major);
    class_destroy(cls);
    unregister_chrdev(major,CNAME);
}
module_init(mycdev_init);
module_exit(mycdev_exit);
MODULE_LICENSE("GPL");

Makefile文件

arch?=arm
file?=demo
ifeq ($(arch),x86)
	LIANXI=/lib/modules/$(shell uname -r)/build
endif
ifeq ($(arch),arm)
	LIANXI=/home/ubuntu/linux-5.10.61
endif
PWD:=$(shell pwd)
all:
	make -C $(LIANXI) M=$(PWD) modules
clean:
	make -C $(LIANXI) M=$(PWD) clean
obj-m:=$(file).o

应用层.c文件

#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include "text.h"
char buf[128]={"i am huyue"};
int main(int argc, char const *argv[])
{
    int fd=-1;
    fd=open("/dev/myled",O_RDWR);
    if(-1==fd)
    {
        perror("open is error");
        exit(1);
    }
    image_t image={20,1034};
    ioctl(fd,UACCESS_BUF,buf);
    ioctl(fd,UACCESS_IMAGE,&image);
    printf("%d    %d\n",image.width,image.high);
    close(fd);
    return 0;
}

.h文件

#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;
}led_t;
typedef enum
{
    LED1,
    LED2,
    LED3
}led_te;
typedef struct {
    int width;
    int high;
}image_t;
 
 
 
 
#define PHY_GPIOE_MODER  0x50006000
#define PHY_GPIOF_MODER  0x50007000
#define PHY_RCC  0x50000A28
#define LED_ON _IOW('a',1,int)
#define LED_OFF _IOW('a',0,int)
#define UACCESS_BUF _IOW('a',1,char [128])
#define UACCESS_IMAGE _IOWR('a',0,image_t)
#endif