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108 lines
3.7 KiB
108 lines
3.7 KiB
/*
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* Copyright (C) 2020 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#define LOG_TAG "FactoryHalHidl"
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#include <media/audiohal/FactoryHalHidl.h>
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#include <dlfcn.h>
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#include <android/hidl/manager/1.0/IServiceManager.h>
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#include <hidl/ServiceManagement.h>
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#include <hidl/Status.h>
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#include <utils/Log.h>
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namespace android::detail {
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namespace {
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/** Supported HAL versions, in order of preference.
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*/
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const char* sAudioHALVersions[] = {
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"7.0",
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"6.0",
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"5.0",
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"4.0",
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nullptr
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};
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bool createHalService(const std::string& version, const std::string& interface,
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void** rawInterface) {
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const std::string libName = "libaudiohal@" + version + ".so";
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const std::string factoryFunctionName = "create" + interface;
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constexpr int dlMode = RTLD_LAZY;
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void* handle = nullptr;
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dlerror(); // clear
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handle = dlopen(libName.c_str(), dlMode);
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if (handle == nullptr) {
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const char* error = dlerror();
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ALOGE("Failed to dlopen %s: %s", libName.c_str(),
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error != nullptr ? error : "unknown error");
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return false;
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}
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void* (*factoryFunction)();
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*(void **)(&factoryFunction) = dlsym(handle, factoryFunctionName.c_str());
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if (!factoryFunction) {
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const char* error = dlerror();
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ALOGE("Factory function %s not found in library %s: %s",
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factoryFunctionName.c_str(), libName.c_str(),
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error != nullptr ? error : "unknown error");
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dlclose(handle);
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return false;
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}
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*rawInterface = (*factoryFunction)();
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ALOGW_IF(!*rawInterface, "Factory function %s from %s returned nullptr",
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factoryFunctionName.c_str(), libName.c_str());
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return true;
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}
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bool hasHalService(const std::string& package, const std::string& version,
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const std::string& interface) {
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using ::android::hidl::manager::V1_0::IServiceManager;
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sp<IServiceManager> sm = ::android::hardware::defaultServiceManager();
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if (!sm) {
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ALOGE("Failed to obtain HIDL ServiceManager");
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return false;
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}
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// Since audio HAL doesn't support multiple clients, avoid instantiating
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// the interface right away. Instead, query the transport type for it.
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using ::android::hardware::Return;
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using Transport = IServiceManager::Transport;
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const std::string fqName = package + "@" + version + "::" + interface;
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const std::string instance = "default";
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Return<Transport> transport = sm->getTransport(fqName, instance);
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if (!transport.isOk()) {
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ALOGE("Failed to obtain transport type for %s/%s: %s",
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fqName.c_str(), instance.c_str(), transport.description().c_str());
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return false;
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}
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return transport != Transport::EMPTY;
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}
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} // namespace
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void* createPreferredImpl(const std::string& package, const std::string& interface) {
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for (auto version = detail::sAudioHALVersions; version != nullptr; ++version) {
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void* rawInterface = nullptr;
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if (hasHalService(package, *version, interface)
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&& createHalService(*version, interface, &rawInterface)) {
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return rawInterface;
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}
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}
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return nullptr;
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}
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} // namespace android::detail
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