Controller

 function add()
    {
       $this->load->helper(array('form', 'url'));
       $this->load->library('form_validation');
        $rules = array(
            array(
                'field' => 'email',
                'label' => 'email',
                'rules' => 'required|valid_email'
            ),
            array(
                'field' => 'username',
                'label' => 'username',
                'rules' => 'trim|required|min_length[5]|max_length[50]|xss_clean'
            ),
            array(
                'field' => 'password',
                'label' => 'Password',
                'rules' => 'required|min_length[5]'
            ),
            array(
                'field' => 'konfirmasi_password',
                'label' => 'Konfirmasi Password',
                'rules' => 'required|matches[konfirmasi_password'
            )
        );
        $this->form_validation->set_rules($rules);
        if ($this->form_validation->run() == FALSE)
        {
            $this->load->view('register_view');
        }
        else
        {
            //echo 'Data berhasil dimasukkan';
            $this->load->model('user_model');
            $hash = $_POST['password'];
                                $hash = sha1($hash);
                                $data = array('email' => $_POST['email'], 'username' => $_POST['username'], 'password' => $hash,'is_Active'=>$_POST['is_Active'] );
            $this->user_model->insert($data);
            $this->load->helper('url');
    redirect('user');

        }

function login(){
    $this->load->view('login_view');

}

 function validate_login() {
	$this->load->model('user_model');
	$this->load->library('session');
        $cek=$this->user_model->validasi();
        if($cek==true ){
            $session=array('username'=>$this->input->post('username'),'is_loged_in'=>true);
            $this->session->set_userdata($session);
    //            $this->load->helper('url');
    //            redirect ('user/data');
            echo 'bisaaaa';
        }
        else{
    //             $this->load->helper('url');
    //             redirect('user/login');
            echo 'todak bisaaaa';
        }
}

model

function validasi()
	{
        $this->load->database();
        $username=$this->input->post('username');
        $password=$this->input->post(sha1($_POST['password']));
	$this->db->where('username',$username);
	$this->db->where('password', $password);

	$ambil = $this->db->get('users');

	 if($ambil->num_rows == 1)
	 {
               return true;
	 }
	}