bagaimana cara memfilter data grafik highcharts agar yang ditampilkan itu berdasarkan id ?

ini controller nya

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

class C_datagt extends MY_Controller {

	protected $access = array('Admin','Pengguna');

	public function __construct()
	{
		parent::__construct();
		$this->load->model('M_datagt');
	}

	public function index()
	{
		$data['suhu']=array();
		$data['kelembaban']=array();
		$data['gas']=array();
   		foreach($this->M_datagt->get()->result_array() as $row){
   			array_push($data['suhu'], (int) $row['suhu']);
    		array_push($data['kelembaban'], (int) $row['kelembaban']);
    		array_push($data['gas'], (int) $row['gas']);
   		}

		$this->load->view('cover/header');
		$this->load->view('v_datagt/tampil_datagt', array('data'=>$data));
		$this->load->view('cover/footer');
	}

}

/* End of file C_datagt.php */
/* Location: ./application/controllers/C_datagt.php */

ini model nya

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

class M_datagt extends CI_Model {

	 public function __construct()
    {
        parent::__construct();
        $this->load->database();
    }

    public function get()
    {
       	$id_gateway = $this->input->get('id_gateway');
        $this->db->like('tanggal','2017-');
        $this->db->order_by('tanggal','asc');
        return $this->db->get_where('tb_datagt', array('id_gateway' => $id_gateway));
    }

}

/* End of file M_datagt.php */
/* Location: ./application/models/M_datagt.php */

dan ini view nya

 <aside class="right-side">
            <!-- Main content -->
            <section class="content-header">
                <h1>Data Pengukuran</h1>
                <ol class="breadcrumb">
                </ol>
            </section>
            <form action="<?= site_url('C_datagt'); ?>" method="post">
                <div class="form-group row">
                  <div class="col-xs-2">
                    <input class="form-control" name="id_gateway" id="id_gateway" type="text">
                  </div>
                  <button type="submit" class="btn btn-info">klik</button>
                </div>
            </form>
            <div id="container" style="min-width: 310px; height: 400px; margin: 0 auto">
                <script src="https://code.highcharts.com/highcharts.js"></script>
    <script src="https://code.highcharts.com/modules/exporting.js"></script>
    <script type="text/javascript">
        Highcharts.chart('container', {
    chart: {
        type: 'area'
    },
    title: {
        text: 'Data Pengukuran SUHU, KELEMBABAN & GAS'
    },
    xAxis: {
        categories: ['Januari', 'Februari', 'Maret', 'April', 'Mei', 'Juni', 'Juli', 'Agustus', 'September', 'Oktober', 'November', 'Desember']
    },
    credits: {
        enabled: false
    },
    series: [{
        name: 'SUHU',
        data: <?php echo json_encode($data['suhu']); ?>
    }, {
        name: 'KELEMBABAN',
        data: <?php echo json_encode($data['kelembaban']); ?>
    }, {
        name: 'GAS',
        data: <?php echo json_encode($data['gas']); ?>
    }]
});
    </script>
            </div>
        </aside>
        <!-- right-side -->