Ajax and Controller

Staff speaks okay, next have a ajax and he calls the controller but it does not receive POST, see the codes below:

Ajax

Code:

function sendFile(file){
data = new FormData();
data.append("file", file);

$.ajax({
           data: data,
           type: "POST",
           url: '/painel/admin/upload/summernote',
           cache: false,
           contentType: false,
           processData: false,
           success: function(url){
               $('.summernote').summernote('editor.insertImage', url);
           }
       });
}

Controller

PHP Code:

public function summernote(){
    print_r($_REQUEST);
    die();
} 


Route

PHP Code:

$route['upload/summernote'] = 'uploads/summernote'; 


Result of print_r
Array()

what I'm doing wrong to the controller does not receive the post of ajax ? Thank you