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 "DeviceHalHidl.h"
30 #include "DevicesFactoryHalHidl.h"
31
32 using ::android::detail::AudioHalVersionInfo;
33 using ::android::hardware::audio::CPP_VERSION::IDevice;
34 using ::android::hardware::audio::CORE_TYPES_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
42 class ServiceNotificationListener : public IServiceNotification {
43 public:
ServiceNotificationListener(sp<DevicesFactoryHalHidl> factory)44 explicit ServiceNotificationListener(sp<DevicesFactoryHalHidl> factory)
45 : mFactory(factory) {}
46
onRegistration(const hidl_string &,const hidl_string & instance_name,bool)47 Return<void> onRegistration(const hidl_string& /*fully_qualified_name*/,
48 const hidl_string& instance_name,
49 bool /*pre_existing*/) override {
50 if (static_cast<std::string>(instance_name) == "default") return Void();
51 sp<DevicesFactoryHalHidl> factory = mFactory.promote();
52 if (!factory) return Void();
53 sp<IDevicesFactory> halFactory = IDevicesFactory::getService(instance_name);
54 if (halFactory) {
55 factory->addDeviceFactory(halFactory, true /*needToNotify*/);
56 }
57 return Void();
58 }
59
60 private:
61 wp<DevicesFactoryHalHidl> mFactory;
62 };
63
DevicesFactoryHalHidl(sp<IDevicesFactory> devicesFactory)64 DevicesFactoryHalHidl::DevicesFactoryHalHidl(sp<IDevicesFactory> devicesFactory) {
65 ALOG_ASSERT(devicesFactory != nullptr, "Provided default IDevicesFactory service is NULL");
66 addDeviceFactory(devicesFactory, false /*needToNotify*/);
67 }
68
onFirstRef()69 void DevicesFactoryHalHidl::onFirstRef() {
70 sp<IServiceManager> sm = IServiceManager::getService();
71 ALOG_ASSERT(sm != nullptr, "Hardware service manager is not running");
72 sp<ServiceNotificationListener> listener = new ServiceNotificationListener(this);
73 Return<bool> result = sm->registerForNotifications(
74 IDevicesFactory::descriptor, "", listener);
75 if (result.isOk()) {
76 ALOGE_IF(!static_cast<bool>(result),
77 "Hardware service manager refused to register listener");
78 } else {
79 ALOGE("Failed to register for hardware service manager notifications: %s",
80 result.description().c_str());
81 }
82 }
83
84 #if MAJOR_VERSION == 2
idFromHal(const char * name,status_t * status)85 static IDevicesFactory::Device idFromHal(const char *name, status_t* status) {
86 *status = OK;
87 if (strcmp(name, AUDIO_HARDWARE_MODULE_ID_PRIMARY) == 0) {
88 return IDevicesFactory::Device::PRIMARY;
89 } else if(strcmp(name, AUDIO_HARDWARE_MODULE_ID_A2DP) == 0) {
90 return IDevicesFactory::Device::A2DP;
91 } else if(strcmp(name, AUDIO_HARDWARE_MODULE_ID_USB) == 0) {
92 return IDevicesFactory::Device::USB;
93 } else if(strcmp(name, AUDIO_HARDWARE_MODULE_ID_REMOTE_SUBMIX) == 0) {
94 return IDevicesFactory::Device::R_SUBMIX;
95 } else if(strcmp(name, AUDIO_HARDWARE_MODULE_ID_STUB) == 0) {
96 return IDevicesFactory::Device::STUB;
97 }
98 ALOGE("Invalid device name %s", name);
99 *status = BAD_VALUE;
100 return {};
101 }
102 #elif MAJOR_VERSION >= 4
idFromHal(const char * name,status_t * status)103 static const char* idFromHal(const char *name, status_t* status) {
104 *status = OK;
105 return name;
106 }
107 #endif
108
getDeviceNames(std::vector<std::string> * names __unused)109 status_t DevicesFactoryHalHidl::getDeviceNames(std::vector<std::string> *names __unused) {
110 return INVALID_OPERATION;
111 }
112
openDevice(const char * name,sp<DeviceHalInterface> * device)113 status_t DevicesFactoryHalHidl::openDevice(const char *name, sp<DeviceHalInterface> *device) {
114 auto factories = copyDeviceFactories();
115 if (factories.empty()) return NO_INIT;
116 status_t status;
117 auto hidlId = idFromHal(name, &status);
118 if (status != OK) return status;
119 Result retval = Result::NOT_INITIALIZED;
120 for (const auto& factory : factories) {
121 Return<void> ret;
122 if (strcmp(name, AUDIO_HARDWARE_MODULE_ID_PRIMARY) == 0) {
123 // In V7.1 it's not possible to cast IDevice back to IPrimaryDevice,
124 // thus openPrimaryDevice must be used.
125 #if MAJOR_VERSION == 7 && MINOR_VERSION == 1
126 ret = factory->openPrimaryDevice_7_1(
127 #else
128 ret = factory->openPrimaryDevice(
129 #endif
130 [&](Result r,
131 const sp<::android::hardware::audio::CPP_VERSION::IPrimaryDevice>& result) {
132 retval = r;
133 if (retval == Result::OK) {
134 *device = new DeviceHalHidl(result);
135 }
136 });
137 } else {
138 #if MAJOR_VERSION == 7 && MINOR_VERSION == 1
139 ret = factory->openDevice_7_1(
140 #else
141 ret = factory->openDevice(
142 #endif
143 hidlId,
144 [&](Result r,
145 const sp<::android::hardware::audio::CPP_VERSION::IDevice>& result) {
146 retval = r;
147 if (retval == Result::OK) {
148 *device = new DeviceHalHidl(result);
149 }
150 });
151 }
152 if (!ret.isOk()) return FAILED_TRANSACTION;
153 switch (retval) {
154 // Device was found and was initialized successfully.
155 case Result::OK: return OK;
156 // Device was found but failed to initalize.
157 case Result::NOT_INITIALIZED: return NO_INIT;
158 // Otherwise continue iterating.
159 default: ;
160 }
161 }
162 ALOGW("The specified device name is not recognized: \"%s\"", name);
163 return BAD_VALUE;
164 }
165
getHalPids(std::vector<pid_t> * pids)166 status_t DevicesFactoryHalHidl::getHalPids(std::vector<pid_t> *pids) {
167 std::set<pid_t> pidsSet;
168 auto factories = copyDeviceFactories();
169 for (const auto& factory : factories) {
170 using ::android::hidl::base::V1_0::DebugInfo;
171
172 DebugInfo debugInfo;
173 auto ret = factory->getDebugInfo([&] (const auto &info) {
174 debugInfo = info;
175 });
176 if (!ret.isOk()) {
177 return INVALID_OPERATION;
178 }
179 if (debugInfo.pid == (int)IServiceManager::PidConstant::NO_PID) {
180 continue;
181 }
182 pidsSet.insert(debugInfo.pid);
183 }
184
185 *pids = {pidsSet.begin(), pidsSet.end()};
186 return NO_ERROR;
187 }
188
setCallbackOnce(sp<DevicesFactoryHalCallback> callback)189 status_t DevicesFactoryHalHidl::setCallbackOnce(sp<DevicesFactoryHalCallback> callback) {
190 ALOG_ASSERT(callback != nullptr);
191 bool needToCallCallback = false;
192 {
193 std::lock_guard<std::mutex> lock(mLock);
194 if (mCallback.unsafe_get()) return INVALID_OPERATION;
195 mCallback = callback;
196 if (mHaveUndeliveredNotifications) {
197 needToCallCallback = true;
198 mHaveUndeliveredNotifications = false;
199 }
200 }
201 if (needToCallCallback) {
202 callback->onNewDevicesAvailable();
203 }
204 return NO_ERROR;
205 }
206
addDeviceFactory(sp<::android::hardware::audio::CPP_VERSION::IDevicesFactory> factory,bool needToNotify)207 void DevicesFactoryHalHidl::addDeviceFactory(
208 sp<::android::hardware::audio::CPP_VERSION::IDevicesFactory> factory, bool needToNotify) {
209 // It is assumed that the DevicesFactoryHalInterface instance is owned
210 // by AudioFlinger and thus have the same lifespan.
211 factory->linkToDeath(HalDeathHandler::getInstance(), 0 /*cookie*/);
212 sp<DevicesFactoryHalCallback> callback;
213 {
214 std::lock_guard<std::mutex> lock(mLock);
215 mDeviceFactories.push_back(factory);
216 if (needToNotify) {
217 callback = mCallback.promote();
218 if (!callback) {
219 mHaveUndeliveredNotifications = true;
220 }
221 }
222 }
223 if (callback) {
224 callback->onNewDevicesAvailable();
225 }
226 }
227
228 std::vector<sp<::android::hardware::audio::CPP_VERSION::IDevicesFactory>>
copyDeviceFactories()229 DevicesFactoryHalHidl::copyDeviceFactories() {
230 std::lock_guard<std::mutex> lock(mLock);
231 return mDeviceFactories;
232 }
233
234
getHalVersion() const235 AudioHalVersionInfo DevicesFactoryHalHidl::getHalVersion() const {
236 return AudioHalVersionInfo(AudioHalVersionInfo::Type::HIDL, MAJOR_VERSION, MINOR_VERSION);
237 }
238
getSurroundSoundConfig(media::SurroundSoundConfig * config __unused)239 status_t DevicesFactoryHalHidl::getSurroundSoundConfig(
240 media::SurroundSoundConfig *config __unused) {
241 return INVALID_OPERATION;
242 }
243
getEngineConfig(media::audio::common::AudioHalEngineConfig * config __unused)244 status_t DevicesFactoryHalHidl::getEngineConfig(
245 media::audio::common::AudioHalEngineConfig *config __unused) {
246 return INVALID_OPERATION;
247 }
248
249 // Main entry-point to the shared library.
createIDevicesFactoryImpl()250 extern "C" __attribute__((visibility("default"))) void* createIDevicesFactoryImpl() {
251 auto service = hardware::audio::CPP_VERSION::IDevicesFactory::getService();
252 return service ? new DevicesFactoryHalHidl(service) : nullptr;
253 }
254
255 } // namespace android
256