Codeigniter + Jquery File Upload

controller.php

<?php
public function save_photo($galleries_id = 0, $item_id = 0, $redirect = '')
{
 // aqui vc faz o upload normal, com a classe upload do CodeIgniter
 // É passado o $_FILES['Filedata']

// vc precisa retornar um json + ou - assim:
$this->output->enable_profiler(FALSE)->set_output(json_encode(
                    array('status' 	=> $res ? TRUE : FALSE,
                            'message' => 'ok',
                            'name' 	=> 'arquivo')));
}
?>

Form.html

<!-- configure a url que irá receber os dados -->
            <input id="fileupload" type="file" name="Filedata" data-url="<?php echo site_url('admin/portfolio/save_photo/' . $gallery->id); ?>" multiple />
            <div id="progress" class="progress progress-striped active">
                <div class="bar" style="width: 0;"></div>
            </div>
            <div id="upload_result"></div>
            <hr />
            <!-- /end multiple upload -->

javascript.js

$('#fileupload').fileupload({
            submit: function (e, data) {
//usei um plugin p/ bloquear a página enquanto o upload acontece. Pode remocer a linha abaixo
                $.blockUI({ message: '<h3>' + processing + '</h3>' }); 
            },
            stop : function(e, data) {
                window.location='<?php echo site_url(uri_string()); ?>';
                setTimeout($.unblockUI, 100); //pode remover
                $('#progress').slideUp('slow').remove();
                $('#upload_result').html('<?php echo msg('info', anchor(uri_string(), " <strong>'+items_uploaded+' </strong>" . lang('portfolio_nr_files_uploaded') . ' ' . lang('portfolio_click_to_see_changes'))) ; ?>').slideDown('slow'); //configure nesta linha a msg no final do upload
                items_uploaded = 0;
            },
            sequentialUploads: true,
            acceptFileTypes : '/(\.|\/)(bmp|gif|jpe?g|jpe|png|bmp)$/i',
            dataType: 'json',
            progressall: function (e, data) {
                var progress = parseInt(data.loaded / data.total * 100, 10);
                $('#progress .bar').css(
                    'width',
                    progress + '%'
                );
            },
            done: function (e, data) {
                items_uploaded++;
            }
        });