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#include <linux/module.h>
#include <linux/fs.h>
#include <linux/init.h>
#include <linux/uaccess.h>

#define DEVICE_NAME "my_device"
#define BUF_SIZE 1024
static char buffer[BUF_SIZE];
static int major;

static int my_device_open(struct inode *inode, struct file *file)
{
    printk(KERN_INFO "Device opened
");
    return 0;
}

static int my_device_release(struct inode *inode, struct file *file)
{
    printk(KERN_INFO "Device closed
");
    return 0;
}

static ssize_t my_device_read(struct file *file, char *buf, size_t count, loff_t *ppos)
{
    if (copy_to_user(buf, buffer, count))
    {
        return -EFAULT;
    }
    return count;
}

static ssize_t my_device_write(struct file *file, const char *buf, size_t count, loff_t *ppos)
{
    if (copy_from_user(buffer, buf, count))
    {
        return -EFAULT;
    }
    return count;
}

static struct file_operations fops = {
    .open = my_device_open,
    .release = my_device_release,
    .read = my_device_read,
    .write = my_device_write,
};

static int __init my_device_init(void)
{
    major = register_chrdev(0, DEVICE_NAME, &fops);
    if (major < 0)
    {
        printk(KERN_ALERT "Failed to register device
");
        return major;
    }
    printk(KERN_INFO "Device registered with major number %d
", major);
    return 0;
}

static void __exit my_device_exit(void)
{
    unregister_chrdev(major, DEVICE_NAME);
    printk(KERN_INFO "Device unregistered
");
}

module_init(my_device_init);
module_exit(my_device_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Your Name");
MODULE_DESCRIPTION("A simple character device driver");

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