1 /*
2  * Copyright (C) 2020 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 
17 #pragma once
18 #include <android-base/unique_fd.h>
19 #include <mutex>
20 #include <thread>
21 #include "data_sink.h"
22 
23 namespace goldfish {
24 using ::android::base::unique_fd;
25 
26 class GnssHwConn {
27 public:
28     explicit GnssHwConn(const DataSink* sink);
29     ~GnssHwConn();
30 
31     bool ok() const;
32     bool start();
33     bool stop();
34 
35 private:
36     static void workerThread(int devFd, int threadsFd, const DataSink* sink);
37     static int workerThreadRcvCommand(int fd);
38     bool sendWorkerThreadCommand(char cmd) const;
39 
40     unique_fd m_devFd;      // Goldfish GPS QEMU device
41     // a pair of connected sockets to talk to the worker thread
42     unique_fd m_callersFd;  // a caller writes here
43     unique_fd m_threadsFd;  // the worker thread listens from here
44     std::thread m_thread;
45 };
46 
47 }  // namespace goldfish
48