public function result()
     {
         foreach (array_keys((array) $this->_pci_devices) as $v) {
             foreach ($this->_pci_devices[$v] as $d) {
                 $this->_result[] = array('vendor' => $d['vendor'], 'device' => $d['device'], 'type' => 'PCI');
             }
         }
         foreach (array_keys((array) $this->_usb_devices) as $v) {
             foreach ($this->_usb_devices[$v] as $d) {
                 $this->_result[] = array('vendor' => $d['vendor'], 'device' => $d['device'], 'type' => 'USB');
             }
         }

         return $this->_result;
     }