1 /*
2 * Copyright (C) 2016 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 <string.h>
18 #include <set>
19
20 #define LOG_TAG "DevicesFactoryHalHidl"
21 //#define LOG_NDEBUG 0
22
23 #include <android/hidl/manager/1.0/IServiceManager.h>
24 #include <android/hidl/manager/1.0/IServiceNotification.h>
25 #include PATH(android/hardware/audio/FILE_VERSION/IDevice.h)
26 #include <media/audiohal/hidl/HalDeathHandler.h>
27 #include <utils/Log.h>
28
29 #include "ConversionHelperHidl.h"
30 #include "DeviceHalHidl.h"
31 #include "DevicesFactoryHalHidl.h"
32
33 using ::android::hardware::audio::CPP_VERSION::IDevice;
34 using ::android::hardware::audio::CPP_VERSION::Result;
35 using ::android::hardware::Return;
36 using ::android::hardware::Void;
37 using ::android::hidl::manager::V1_0::IServiceManager;
38 using ::android::hidl::manager::V1_0::IServiceNotification;
39
40 namespace android {
41 namespace CPP_VERSION {
42
43 class ServiceNotificationListener : public IServiceNotification {
44 public:
ServiceNotificationListener(sp<DevicesFactoryHalHidl> factory)45 explicit ServiceNotificationListener(sp<DevicesFactoryHalHidl> factory)
46 : mFactory(factory) {}
47
onRegistration(const hidl_string &,const hidl_string & instance_name,bool)48 Return<void> onRegistration(const hidl_string& /*fully_qualified_name*/,
49 const hidl_string& instance_name,
50 bool /*pre_existing*/) override {
51 if (static_cast<std::string>(instance_name) == "default") return Void();
52 sp<DevicesFactoryHalHidl> factory = mFactory.promote();
53 if (!factory) return Void();
54 sp<IDevicesFactory> halFactory = IDevicesFactory::getService(instance_name);
55 if (halFactory) {
56 factory->addDeviceFactory(halFactory, true /*needToNotify*/);
57 }
58 return Void();
59 }
60
61 private:
62 wp<DevicesFactoryHalHidl> mFactory;
63 };
64
DevicesFactoryHalHidl(sp<IDevicesFactory> devicesFactory)65 DevicesFactoryHalHidl::DevicesFactoryHalHidl(sp<IDevicesFactory> devicesFactory) {
66 ALOG_ASSERT(devicesFactory != nullptr, "Provided default IDevicesFactory service is NULL");
67 addDeviceFactory(devicesFactory, false /*needToNotify*/);
68 }
69
onFirstRef()70 void DevicesFactoryHalHidl::onFirstRef() {
71 sp<IServiceManager> sm = IServiceManager::getService();
72 ALOG_ASSERT(sm != nullptr, "Hardware service manager is not running");
73 sp<ServiceNotificationListener> listener = new ServiceNotificationListener(this);
74 Return<bool> result = sm->registerForNotifications(
75 IDevicesFactory::descriptor, "", listener);
76 if (result.isOk()) {
77 ALOGE_IF(!static_cast<bool>(result),
78 "Hardware service manager refused to register listener");
79 } else {
80 ALOGE("Failed to register for hardware service manager notifications: %s",
81 result.description().c_str());
82 }
83 }
84
85 #if MAJOR_VERSION == 2
idFromHal(const char * name,status_t * status)86 static IDevicesFactory::Device idFromHal(const char *name, status_t* status) {
87 *status = OK;
88 if (strcmp(name, AUDIO_HARDWARE_MODULE_ID_PRIMARY) == 0) {
89 return IDevicesFactory::Device::PRIMARY;
90 } else if(strcmp(name, AUDIO_HARDWARE_MODULE_ID_A2DP) == 0) {
91 return IDevicesFactory::Device::A2DP;
92 } else if(strcmp(name, AUDIO_HARDWARE_MODULE_ID_USB) == 0) {
93 return IDevicesFactory::Device::USB;
94 } else if(strcmp(name, AUDIO_HARDWARE_MODULE_ID_REMOTE_SUBMIX) == 0) {
95 return IDevicesFactory::Device::R_SUBMIX;
96 } else if(strcmp(name, AUDIO_HARDWARE_MODULE_ID_STUB) == 0) {
97 return IDevicesFactory::Device::STUB;
98 }
99 ALOGE("Invalid device name %s", name);
100 *status = BAD_VALUE;
101 return {};
102 }
103 #elif MAJOR_VERSION >= 4
idFromHal(const char * name,status_t * status)104 static const char* idFromHal(const char *name, status_t* status) {
105 *status = OK;
106 return name;
107 }
108 #endif
109
openDevice(const char * name,sp<DeviceHalInterface> * device)110 status_t DevicesFactoryHalHidl::openDevice(const char *name, sp<DeviceHalInterface> *device) {
111 auto factories = copyDeviceFactories();
112 if (factories.empty()) return NO_INIT;
113 status_t status;
114 auto hidlId = idFromHal(name, &status);
115 if (status != OK) return status;
116 Result retval = Result::NOT_INITIALIZED;
117 for (const auto& factory : factories) {
118 Return<void> ret = factory->openDevice(
119 hidlId,
120 [&](Result r, const sp<IDevice>& result) {
121 retval = r;
122 if (retval == Result::OK) {
123 *device = new DeviceHalHidl(result);
124 }
125 });
126 if (!ret.isOk()) return FAILED_TRANSACTION;
127 switch (retval) {
128 // Device was found and was initialized successfully.
129 case Result::OK: return OK;
130 // Device was found but failed to initalize.
131 case Result::NOT_INITIALIZED: return NO_INIT;
132 // Otherwise continue iterating.
133 default: ;
134 }
135 }
136 ALOGW("The specified device name is not recognized: \"%s\"", name);
137 return BAD_VALUE;
138 }
139
getHalPids(std::vector<pid_t> * pids)140 status_t DevicesFactoryHalHidl::getHalPids(std::vector<pid_t> *pids) {
141 std::set<pid_t> pidsSet;
142 auto factories = copyDeviceFactories();
143 for (const auto& factory : factories) {
144 using ::android::hidl::base::V1_0::DebugInfo;
145
146 DebugInfo debugInfo;
147 auto ret = factory->getDebugInfo([&] (const auto &info) {
148 debugInfo = info;
149 });
150 if (!ret.isOk()) {
151 return INVALID_OPERATION;
152 }
153 if (debugInfo.pid == (int)IServiceManager::PidConstant::NO_PID) {
154 continue;
155 }
156 pidsSet.insert(debugInfo.pid);
157 }
158
159 *pids = {pidsSet.begin(), pidsSet.end()};
160 return NO_ERROR;
161 }
162
setCallbackOnce(sp<DevicesFactoryHalCallback> callback)163 status_t DevicesFactoryHalHidl::setCallbackOnce(sp<DevicesFactoryHalCallback> callback) {
164 ALOG_ASSERT(callback != nullptr);
165 bool needToCallCallback = false;
166 {
167 std::lock_guard<std::mutex> lock(mLock);
168 if (mCallback.unsafe_get()) return INVALID_OPERATION;
169 mCallback = callback;
170 if (mHaveUndeliveredNotifications) {
171 needToCallCallback = true;
172 mHaveUndeliveredNotifications = false;
173 }
174 }
175 if (needToCallCallback) {
176 callback->onNewDevicesAvailable();
177 }
178 return NO_ERROR;
179 }
180
addDeviceFactory(sp<IDevicesFactory> factory,bool needToNotify)181 void DevicesFactoryHalHidl::addDeviceFactory(sp<IDevicesFactory> factory, bool needToNotify) {
182 // It is assumed that the DevicesFactoryHalInterface instance is owned
183 // by AudioFlinger and thus have the same lifespan.
184 factory->linkToDeath(HalDeathHandler::getInstance(), 0 /*cookie*/);
185 sp<DevicesFactoryHalCallback> callback;
186 {
187 std::lock_guard<std::mutex> lock(mLock);
188 mDeviceFactories.push_back(factory);
189 if (needToNotify) {
190 callback = mCallback.promote();
191 if (!callback) {
192 mHaveUndeliveredNotifications = true;
193 }
194 }
195 }
196 if (callback) {
197 callback->onNewDevicesAvailable();
198 }
199 }
200
copyDeviceFactories()201 std::vector<sp<IDevicesFactory>> DevicesFactoryHalHidl::copyDeviceFactories() {
202 std::lock_guard<std::mutex> lock(mLock);
203 return mDeviceFactories;
204 }
205
206 } // namespace CPP_VERSION
207 } // namespace android
208