function datatables_usuarios($data=array())
{
    $this->load->library('datatables');
    $this->load->helper('data');

    $this->datatables
    ->select("codigo, nome")
    ->from('usuarios');

    //$this->datatables->edit_column('data', '$1', "format_date_timestamp('cham_dtabe','sim')");
    //->where('cham_id <', '10');

    $data['result'] = $this->datatables->generate();

    return $data;
}