CodeIgniter MY_Upload Extension to create filepath directory if not exist and make it really writable

MY_Upload.php

<?php
defined('BASEPATH') OR exit('No direct script access allowed');

/**
 * File Uploading Class Extension
 *
 * @package     CodeIgniter
 * @subpackage  Libraries
 * @category    Uploads
 * @author      Harrison Emmanuel (Eharry.me)
 * @link        https://www.eharry.me/blog/post/my-codeigniter-upload-extension/
 */
class MY_Upload extends CI_Upload {

    /**
     * Validate Upload Path
     *
     * Verifies that it is a valid upload path with proper permissions.
     *
     * @return	bool
     */
    public function validate_upload_path()
    {
        if ($this->upload_path === '')
        {
            $this->set_error('upload_no_filepath', 'error');
            return FALSE;
        }

        if (realpath($this->upload_path) !== FALSE)
        {
            $this->upload_path = str_replace('\\', '/', realpath($this->upload_path));
        }

        if ( ! is_dir($this->upload_path))
        {
            // EDIT: make directory and try again
            if ( ! mkdir ($this->upload_path, 0777, TRUE))
            {
                $this->set_error('upload_no_filepath', 'error');
                return FALSE;
            }
        }

        if ( ! is_really_writable($this->upload_path))
        {
            // EDIT: change directory mode
            if ( ! chmod($this->upload_path, 0777))
            {
                $this->set_error('upload_not_writable', 'error');
                return FALSE;
            }
        }

        $this->upload_path = preg_replace('/(.+?)\/*$/', '\\1/',  $this->upload_path);
        return TRUE;
    }
}

silly question: how to use this library?
thanks