22071华清远见（上海中心）

#include <linux/init.h>
#include <linux/module.h>
#include<linux/i2c.h>
#include<linux/fs.h>
#include<linux/uaccess.h>
#include<linux/device.h>
#include"si7006.h"

int major;
struct class *cls;
struct device *dev;
struct i2c_client *tclient;
//获取温湿度数据的函数
int i2c_read_hum_tem(unsigned char reg)
{
    int ret;
    //读消息的封装
    char r_buf[]={reg};
    unsigned short val;//读的数据
    struct i2c_msg r_msg[]={
         [0]={
             .addr=tclient->addr,
            .flags=0,
            .len=1,
            .buf=r_buf,   
         },
         [1]={
            .addr=tclient->addr,
            .flags=1,
            .len=2,
            .buf=(char *)&val,   
         },
    };
    //消息的传输
    ret=i2c_transfer(tclient->adapter,r_msg,ARRAY_SIZE(r_msg));
    if(ret!=ARRAY_SIZE(r_msg))
    {
        printk("i2c获取温湿度数据失败n");
        return EAGAIN;
    }
    return val;
}

 //匹配成功后执行probe
int si7006_open(struct inode *inode, struct file *file)
{
    printk("openn");
    return 0;
}
ssize_t si7006_read(struct file *file, char *ubuf, size_t size, loff_t *off)
{
     printk("readn");
    return 0;
}
ssize_t si7006_write(struct file *file, const char  *ubuf, size_t size, loff_t *off)
{
     printk("writen");
    return 0;
}
long si7006_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
    int tem,hum;
    int ret;
    switch(cmd)
    {
        case GET_HUM:
            hum=i2c_read_hum_tem(0xe5);
            ret=copy_to_user((void *)arg,(void *)&hum,sizeof(int));
            if(ret)
            {
                printk("copy_to_user fildn");
                return EINVAL;
            }
            break;
        case GET_TEM:
            tem=i2c_read_hum_tem(0xe3);
            ret=copy_to_user((void *)arg,(void *)&tem,sizeof(int));
            if(ret)
            {
                printk("copy_to_user fildn");
                return EINVAL;
            }
            break;
    }
    return 0;
}
int si7006_close(struct inode *inode, struct file *file)
{
     printk("closen");
    return 0;
}
struct file_operations fops={
    .open=si7006_open,
    .read=si7006_read,
    .write=si7006_write,
    .unlocked_ioctl=si7006_ioctl,
    .release=si7006_close,
};

int si7006_probe(struct i2c_client *client, const struct i2c_device_id *id)
{
    //把总线驱动指针变成全局的
    tclient=client;
    //注册字符设备驱动
    major=register_chrdev(0,"si7006",&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n");
    //自动创建设备节点
    cls=class_create(THIS_MODULE,"si7006");
    if(IS_ERR(cls))
    {
        printk("向上提交目录失败n");
        return PTR_ERR(cls);
    }
    printk("向上提交目录成功n");
    dev=device_create(cls,NULL,MKDEV(major,0),NULL,"si7006");
     if(IS_ERR(dev))
    {
        printk("向上提交设备信息失败n");
        return PTR_ERR(dev);
    }
    printk("向上提交设备信息成功n");
    return 0;
}
   //设备分离后执行remove
int si7006_remove(struct i2c_client *client)
{
    printk("%s:%dn",__func__,__LINE__);
    return 0;
}
//定义设备树匹配表
struct of_device_id oftable[]=
{
  {.compatible="hqyj,si7006",},
  {}  
};
MODULE_DEVICE_TABLE(of,oftable);
//定义对象并且初始化
struct i2c_driver si7006={
    .probe=si7006_probe,
    .remove=si7006_remove,
    .driver={
        .name="tem_hum_driver",
        .of_match_table=oftable,
    },
};

module_i2c_driver(si7006);
MODULE_LICENSE("GPL");

#ifndef __SI7006_H__
#define __SI7006_H__
#define GET_TEM  _IOR('m',0,int)
#define GET_HUM  _IOR('m',1,int)
#endif

#include<stdio.h>
#include <sys/types.h>
 #include <sys/stat.h>
 #include <fcntl.h>
 #include <unistd.h>
 #include <sys/ioctl.h>
 #include<stdlib.h>
#include <arpa/inet.h>
#include"iic.h"
 
int main(int argc, char const *argv[])
{
    int which;
    int hum,tem;
    int ret;
    float hum1,tem1;
    int fd=open("/dev/si7006",O_RDWR);
    if(fd<0)
    {
        printf("open is errorn");
        return -1;
    }
 
    while(1)
    {
        ioctl(fd,GET_TEM,&tem);
        ioctl(fd,GET_HUM,&hum);
 
        //字节序转换
        hum=ntohs(hum);
        tem=ntohs(tem);
 
        //温湿度计算
        hum1 = 125.0*hum/65536-6;
        tem1 = 175.72*tem/65536-46.85;
        printf("tem:%f  hum:%fn",tem1,hum1);
        if(tem1<25)
        {
            which=1;
            ioctl(fd,LED_ON,&which);
        }
        else
        {
            which=0;
            ioctl(fd,LED_OFF,&which);
        }
 
        sleep(1);
    }
 
    return 0;
}

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