usb_serial: Probe for USB endpoints on Option device

* More then one serial port is common, for now we only
  work off of the first one detected.
* Still disabled as some setup is needed.

src/add-ons/kernel/drivers/ports/usb_serial/Option.cpp

@@ -24,8 +24,58 @@ OptionDevice::AddDevice(const usb_configuration_info *config)
 {
 	TRACE_FUNCALLS("> OptionDevice::AddDevice(%08x, %08x)\n", this, config);
 
-	status_t status = B_OK;
+	if (config->interface_count > 0) {
-	return status;
+		for (size_t index = 0; index < config->interface_count; index++) {
+			usb_interface_info *interface = config->interface[index].active;
+
+			int txEndpointID = -1;
+			int rxEndpointID = -1;
+			int irEndpointID = -1;
+
+			for (size_t i = 0; i < interface->endpoint_count; i++) {
+				usb_endpoint_info *endpoint = &interface->endpoint[i];
+
+				// Find our Interrupt endpoint
+				if (endpoint->descr->attributes == USB_ENDPOINT_ATTR_INTERRUPT
+					&& (endpoint->descr->endpoint_address
+						& USB_ENDPOINT_ADDR_DIR_IN) != 0) {
+					irEndpointID = i;
+					continue;
+				}
+
+				// Find our Transmit / Receive endpoints
+				if (endpoint->descr->attributes == USB_ENDPOINT_ATTR_BULK) {
+					if ((endpoint->descr->endpoint_address
+						& USB_ENDPOINT_ADDR_DIR_IN) != 0) {
+						rxEndpointID = i;
+					} else {
+						txEndpointID = i;
+					}
+					continue;
+				}
+			}
+
+			TRACE("> OptionDevice::%s: endpoint %d, tx: %d, rx: %d, ir: %d\n",
+				__func__, index, txEndpointID, rxEndpointID, irEndpointID);
+
+			if (txEndpointID < 0 || rxEndpointID < 0 || irEndpointID < 0)
+				continue;
+
+			TRACE("> OptionDevice::%s: found at interface %d\n", __func__,
+				index);
+			usb_endpoint_info *irEndpoint = &interface->endpoint[irEndpointID];
+			usb_endpoint_info *txEndpoint = &interface->endpoint[irEndpointID];
+			usb_endpoint_info *rxEndpoint = &interface->endpoint[irEndpointID];
+			SetControlPipe(irEndpoint->handle);
+			SetReadPipe(rxEndpoint->handle);
+			SetWritePipe(txEndpoint->handle);
+
+			// We accept the first found serial interface
+			// TODO: We should set each matching interface up (can be > 1)
+			return B_OK;
+		}
+	}
+	return ENODEV;
 }