1 /* 2 * Copyright (C) 2017 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 #pragma once 17 18 #include <memory> 19 #include <string> 20 #include <thread> 21 22 #include "common/libs/fs/shared_fd.h" 23 24 namespace vadb { 25 namespace usbip { 26 // VHCIInstrument class configures VHCI-HCD on local kernel. 27 class VHCIInstrument { 28 public: 29 VHCIInstrument(int port, const std::string& name); 30 virtual ~VHCIInstrument(); 31 32 // Init opens vhci-hcd driver and allocates port to which remote USB device 33 // will be attached. 34 // Returns false, if vhci-hcd driver could not be opened, or if no free port 35 // was found. 36 bool Init(); 37 38 // TriggerAttach tells underlying thread to make attempt to re-attach USB 39 // device. 40 void TriggerAttach(); 41 42 // TriggerDetach tells underlying thread to disconnect remote USB device. 43 void TriggerDetach(); 44 45 private: 46 // Attach makes an attempt to configure VHCI to enable virtual USB device. 47 // Returns true, if configuration attempt was successful. 48 bool Attach(); 49 50 // Detach disconnects virtual USB device. 51 // Returns true, if attempt was successful. 52 bool Detach(); 53 54 // AttachThread is a background thread that responds to configuration 55 // requests. 56 void AttachThread(); 57 bool VerifyPortIsFree() const; 58 59 private: 60 std::string name_; 61 std::thread attach_thread_; 62 std::string syspath_; 63 cvd::SharedFD control_write_end_; 64 cvd::SharedFD control_read_end_; 65 cvd::SharedFD vhci_socket_; 66 int port_{}; 67 68 VHCIInstrument(const VHCIInstrument& other) = delete; 69 VHCIInstrument& operator=(const VHCIInstrument& other) = delete; 70 }; 71 } // namespace usbip 72 } // namespace vadb 73
