linux iic 驱动

#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/fs.h>

// 设备地址
#define IIC_DEVICE_ADDR 0x50

// IIC驱动结构体
static struct i2c_client *iic_client;

// 打开设备
static int iic_open(struct inode *inode, struct file *file)
{
    // 初始化IIC客户端
    iic_client = i2c_new_device(i2c_get_adapter(1), &i2c_device_id);
    if (IS_ERR(iic_client)) {
        pr_err("Failed to create IIC client
");
        return PTR_ERR(iic_client);
    }
    return 0;
}

// 关闭设备
static int iic_release(struct inode *inode, struct file *file)
{
    if (iic_client) {
        i2c_unregister_device(iic_client);
        iic_client = NULL;
    }
    return 0;
}

// 驱动操作结构体
static const struct file_operations iic_fops = {
    .owner = THIS_MODULE,
    .open = iic_open,
    .release = iic_release,
};

// 模块初始化
static int __init iic_init(void)
{
    // 注册字符设备驱动
    if (register_chrdev(240, "iic_device", &iic_fops)) {
        pr_err("Failed to register IIC device
");
        return -EIO;
    }
    return 0;
}

// 模块退出
static void __exit iic_exit(void)
{
    unregister_chrdev(240, "iic_device");
}

module_init(iic_init);
module_exit(iic_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Your Name");
MODULE_DESCRIPTION("IIC Device Driver");