1 /*
2 * Copyright (C) 2022 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 #include "EvsEnumerator.h"
18 #include "EvsGlDisplay.h"
19
20 #include <android/binder_manager.h>
21 #include <android/binder_process.h>
22 #include <utils/Log.h>
23
24 #include <unistd.h>
25
26 #include <atomic>
27 #include <cstdlib>
28 #include <string_view>
29
30 namespace {
31
32 using ::aidl::android::frameworks::automotive::display::ICarDisplayProxy;
33 using ::aidl::android::hardware::automotive::evs::implementation::EvsEnumerator;
34
35 constexpr std::string_view kDisplayServiceInstanceName = "/default";
36 constexpr std::string_view kHwInstanceName = "/hw/1";
37 constexpr int kNumBinderThreads = 1;
38
39 } // namespace
40
main()41 int main() {
42 LOG(INFO) << "EVS Hardware Enumerator service is starting";
43
44 const std::string displayServiceInstanceName =
45 std::string(ICarDisplayProxy::descriptor) + std::string(kDisplayServiceInstanceName);
46 if (!AServiceManager_isDeclared(displayServiceInstanceName.data())) {
47 // TODO: We may just want to disable EVS display.
48 LOG(ERROR) << displayServiceInstanceName << " is required.";
49 return EXIT_FAILURE;
50 }
51
52 std::shared_ptr<ICarDisplayProxy> displayService = ICarDisplayProxy::fromBinder(
53 ::ndk::SpAIBinder(AServiceManager_waitForService(displayServiceInstanceName.data())));
54 if (!displayService) {
55 LOG(ERROR) << "Cannot use " << displayServiceInstanceName << ". Exiting.";
56 return EXIT_FAILURE;
57 }
58
59 // Register our service -- if somebody is already registered by our name,
60 // they will be killed (their thread pool will throw an exception).
61 std::shared_ptr<EvsEnumerator> service =
62 ndk::SharedRefBase::make<EvsEnumerator>(displayService);
63 if (!service) {
64 LOG(ERROR) << "Failed to instantiate the service";
65 return EXIT_FAILURE;
66 }
67
68 std::atomic<bool> running{true};
69 std::thread hotplugHandler(EvsEnumerator::EvsHotplugThread, service, std::ref(running));
70
71 const std::string instanceName =
72 std::string(EvsEnumerator::descriptor) + std::string(kHwInstanceName);
73 auto err = AServiceManager_addService(service->asBinder().get(), instanceName.data());
74 if (err != EX_NONE) {
75 LOG(ERROR) << "Failed to register " << instanceName << ", exception = " << err;
76 return EXIT_FAILURE;
77 }
78
79 if (!ABinderProcess_setThreadPoolMaxThreadCount(kNumBinderThreads)) {
80 LOG(ERROR) << "Failed to set thread pool";
81 return EXIT_FAILURE;
82 }
83
84 ABinderProcess_startThreadPool();
85 LOG(INFO) << "EVS Hardware Enumerator is ready";
86
87 ABinderProcess_joinThreadPool();
88 // In normal operation, we don't expect the thread pool to exit
89 LOG(INFO) << "EVS Hardware Enumerator is shutting down";
90
91 // Exit a hotplug device thread
92 running = false;
93 if (hotplugHandler.joinable()) {
94 hotplugHandler.join();
95 }
96
97 return EXIT_SUCCESS;
98 }
99