驱动开发platform传地址，led点灯

snk85k12024-04-23 23:36

除了platform传地址，其他的跟指定入口地址和指定出口地址没区别

platform和指定入口地址不能同时存在，一直报错模块初始化重定义，半个小时搞完程序没问题，这个重复定义因为代码太多没看懂错误，删了又加没试出来怎么改错。

1.myled.h

cs 复制代码 
#ifndef __MYLED_H__
#define __MYLED_H__
 
enum{
    LED1, //0
    LED2, //1
    LED3, //2
};
typedef struct {
    volatile unsigned int MODER;   // 0x00
    volatile unsigned int OTYPER;  // 0x04
    volatile unsigned int OSPEEDR; // 0x08
    volatile unsigned int PUPDR;   // 0x0C
    volatile unsigned int IDR;     // 0x10                                                                        
    volatile unsigned int ODR;     // 0x14
    volatile unsigned int BSRR;    // 0x18
    volatile unsigned int LCKR;    // 0x1C 
    volatile unsigned int AFRL;    // 0x20 
    volatile unsigned int AFRH;    // 0x24
    volatile unsigned int BRR;     // 0x28
    volatile unsigned int res;
    volatile unsigned int SECCFGR; // 0x30
}gpio_t;
 

 

 
#define LED_ON  _IOW('a',1,int) //封装灯亮命令码
#define LED_OFF _IOW('a',0,int) //封装灯灭命令码
#define GET_CMD_SIZE(cmd) (cmd >> 16 & 0x3fff)  //封装命令码大小
 
#endif

2.pdrv.c

cs 复制代码 
#include <linux/init.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/mod_devicetable.h>
#include <linux/fs.h>
#include <linux/uaccess.h>
#include <linux/io.h>
#include "myled.h"
#include <linux/cdev.h>
#include <linux/slab.h>
#include <linux/device.h>

struct cdev* cdev;
#if 1
unsigned int major = 0; 
#else
unsigned int major = 500;
#endif
unsigned int minor = 0;
unsigned int count = 3;
#define CNAME "myled"
struct class *cls;
struct device *device;

unsigned int* rcc_virt = NULL;
gpio_t* gpioe_virt = NULL;
gpio_t* gpiof_virt = NULL;
 
#define LED1_ON (gpioe_virt->ODR |= (0x1 << 10))
#define LED1_OFF (gpioe_virt->ODR &= (~(0x1 << 10)))
 
#define LED2_ON (gpiof_virt->ODR |= (0x1 << 10))
#define LED2_OFF (gpiof_virt->ODR &= (~(0x1 << 10)))
 
#define LED3_ON (gpioe_virt->ODR |= (0x1 << 8))
#define LED3_OFF (gpioe_virt->ODR &= (~(0x1 << 8)))
struct resource* res;

#define  GPIOE   res[0].start
#define RCC_MP_AHB4ENSETR_PHY  res[1].start



int myled_open(struct inode *inode, struct file *file)
{
    printk("%s:%s:%d\n",__FILE__,__func__,__LINE__);
    printk("美妙的时光总有尽头\n");
    return 0;
}
 
long myled_ioctl(struct file *file, unsigned int cmd, unsigned long args)
{
    int ret;
    int whitch;
    switch(cmd) //判断命令码
    {
        case LED_ON: //灯亮命令码
            ret = copy_from_user(&whitch,(void*)args,GET_CMD_SIZE(LED_ON));
            if(ret){
                printk("copy from user is error\n");
                return -EIO;
            }
            switch (whitch) //判断哪一盏灯点亮
            {
            case LED1:
                LED1_ON; //LED1点亮
                break;                        
            }
        break;
        case LED_OFF: //灯灭命令码
            ret = copy_from_user(&whitch,(void*)args,GET_CMD_SIZE(LED_OFF));
            if(ret){
                printk("copy from user is error\n");
                return -EIO;
            }
            switch (whitch) //判断哪一盏灯熄灭
            {
            case LED1:
                LED1_OFF; //LED1熄灭
                break;                        
            }        
        break;
    }
    return 0;
}
int myled_close(struct inode *inode, struct file *file)
{
    printk("%s:%s:%d\n",__FILE__,__func__,__LINE__);
    printk("还起床了\n");
    return 0;     
}
 
//操作方法结构体
const struct file_operations fops = {
    .open = myled_open,
    .unlocked_ioctl = myled_ioctl,
    .release = myled_close,
};

//当设备信息端和设备驱动端匹配成功时，执行probe函数
int pdrv_probe(struct platform_device *pdev)
{
    int ret;
    int i;
    dev_t devno;
    printk("%s:%s:%d\n",__FILE__,__func__,__LINE__);
    printk("name = %s id = %ld\n",pdev->id_entry->name,pdev->id_entry->driver_data);
    //获取设备信息端地址信息
    res = platform_get_resource(pdev,IORESOURCE_MEM,0);
    if(res == NULL){
        printk("platform get resource is error\n");
        return -EIO;
    }
    //打印获取到的地址信息 中断号
    printk("GPIOEaddress = %#x RCCaddress = %#x\n",res[0].start,res[1].start);
    
    //分配对象
    cdev = cdev_alloc(); 
    if(cdev == NULL){
        printk("cdev alloc is error\n");
        ret = -ENOMEM;
        goto ERR1;        
    }
    //对象初始化
    cdev_init(cdev,&fops);
   
    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 =  -EIO;
            goto ERR2;            
        }
    }else{ //动态指定设备号
        ret = alloc_chrdev_region(&devno,minor,count,CNAME);
        if(ret){
            printk("alloc chrdev region is error\n");
            ret =  -EIO;
            goto ERR2;            
        }
        major = MAJOR(devno);//通过设备号，获取到主设备号的值
        minor = MINOR(devno);//通过设备号，获取到次设备号的值
    }  
 
    //注册
    ret = cdev_add(cdev,MKDEV(major,minor),count); 
    if(ret){
        printk("cdev add is error\n");
        ret =  -EIO;
        goto ERR3;            
    }
    //向上层提交目录信息
    cls = class_create(THIS_MODULE,CNAME);
    if(IS_ERR(cls)){
        ret = PTR_ERR(cls);
        goto ERR4;
    }
 
    for(i=0;i<count;i++)
    {
        //向上层提交设备节点信息
        device = device_create(cls,NULL,MKDEV(major,i),NULL,"myled%d",i);
        if(IS_ERR(device)){
            ret = PTR_ERR(device);
            goto ERR5;
        }  
    }
  

    //rcc物理地址映射
    rcc_virt = ioremap(RCC_MP_AHB4ENSETR_PHY,4);
    if(rcc_virt == NULL){
        printk("rcc ioremap is error\n");
        return -EIO;
    }
    //GPIOE组寄存器物理地址映射
    gpioe_virt = ioremap(GPIOE,sizeof(gpio_t));
    if(gpioe_virt == NULL){
        printk("gpioe ioremap is error\n");
        return -EIO;
    }
    //LED1灯初始化 PE10
    *rcc_virt |= (0x1 << 4); //使能GPIOE组控制器 
    gpioe_virt->MODER &= (~(0x3 << 20)); //设置PE10引脚为输出模式
    gpioe_virt->MODER |= (0x1 << 20);
    gpioe_virt->ODR &= (~(0x1 << 10)); //设置PE10引脚输出低电平
    return 0; 
 
ERR5:
    //创建三个设备节点时，第一个设备节点和第二个设备节点创建成功，第三个设备节点创建失败
    //需要将第一个设备节点和第二个设备节点创建成功，需要进行释放
    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 ret;
}
 
 //当任意一方卸载，执行remove函数
int pdrv_remove(struct platform_device *pdev)
{
    int i = 0;
    printk("%s:%s:%d\n",__FILE__,__func__,__LINE__);
    //取消地址映射
    iounmap(rcc_virt);
    iounmap(gpioe_virt);
    for(i=0;i<count;i++)
    {
        device_destroy(cls,MKDEV(major,i));
    }
    class_destroy(cls);
    cdev_del(cdev);
    unregister_chrdev_region(MKDEV(major,minor),count);
    kfree(cdev);
    return 0;
}
 
const struct platform_device_id idtable[] = {
    {"hello1",1},
    {},/*防止数组越界*/
};


//初始化设备驱动端结构体
struct platform_driver pdrv = {
    .probe = pdrv_probe,
    .remove = pdrv_remove,
    .driver = {
        .name = "hello DC23111", //通过名字进行匹配
    },
    .id_table = idtable,
};
module_platform_driver(pdrv);
MODULE_LICENSE("GPL");

3.pdev.c

cs 复制代码 
#include <linux/init.h>
#include <linux/module.h>
#include <linux/platform_device.h>
 
//描述设备信息结构体
struct resource res[2] = {
    [0] = {
        .start = 0x50006000, //起始地址
        .end = 0x50006000 + 31, //终止地址
        .flags = IORESOURCE_MEM, //资源类型
    },
    [1] = {
        .start = 0x50000A28, 
        .end = 0x50000A28 + 31,
        .flags = IORESOURCE_MEM,
    },
};
void pdev_release(struct device *dev)
{
    printk("%s:%s:%d\n",__FILE__,__func__,__LINE__);
}
//初始化设备信息端结构体
struct platform_device pdev = {
    .name = "hello1", //通过名字进行匹配
    .id = PLATFORM_DEVID_AUTO, //自动分配
    .dev = {
        .release = pdev_release,
    },
    .num_resources = ARRAY_SIZE(res),
    .resource = res,
};
 
static int __init demo_init(void)
{
    //注册设备信息端
    return platform_device_register(&pdev);
}
 
static void __exit demo_exit(void)
{
    //注销设备信息端
    platform_device_unregister(&pdev);
}
 
module_init(demo_init);
module_exit(demo_exit);
MODULE_LICENSE("GPL");

4.test.c

cs 复制代码 
#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 "myled.h"
 
int main(int argc, const char *argv[])
{
    int fd = -1;
    int whitch;
    char buf[128] = "";
    fd = open("/dev/myled0",O_RDWR);
    if(fd == -1){
        perror("open is error");
        return -1;
    }
    while(1)
    {
        whitch = LED1;
        ioctl(fd,LED_ON,&whitch);
        sleep(1);
        ioctl(fd,LED_OFF,&whitch);
        sleep(1);
    }
    close(fd);
    return 0;
}
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