+
+static int whiteheat_probe(struct usb_serial *serial,
+ const struct usb_device_id *id)
+{
+ struct usb_host_interface *iface_desc;
+ struct usb_endpoint_descriptor *endpoint;
+ size_t num_bulk_in = 0;
+ size_t num_bulk_out = 0;
+ size_t min_num_bulk;
+ unsigned int i;
+
+ iface_desc = serial->interface->cur_altsetting;
+
+ for (i = 0; i < iface_desc->desc.bNumEndpoints; i++) {
+ endpoint = &iface_desc->endpoint[i].desc;
+ if (usb_endpoint_is_bulk_in(endpoint))
+ ++num_bulk_in;
+ if (usb_endpoint_is_bulk_out(endpoint))
+ ++num_bulk_out;
+ }
+
+ min_num_bulk = COMMAND_PORT + 1;
+ if (num_bulk_in < min_num_bulk || num_bulk_out < min_num_bulk)
+ return -ENODEV;
+
+ return 0;
+}
+