1 files changed, 94 insertions, 0 deletions
diff --git a/services/powermanager/PowerHalLoader.cpp b/services/powermanager/PowerHalLoader.cpp
new file mode 100644
index 0000000000..3ae538447b
--- /dev/null
+++ b/services/powermanager/PowerHalLoader.cpp
@@ -0,0 +1,94 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#define LOG_TAG "PowerHalLoader"
+
+#include <android/hardware/power/1.1/IPower.h>
+#include <android/hardware/power/IPower.h>
+#include <binder/IServiceManager.h>
+#include <hardware/power.h>
+#include <hardware_legacy/power.h>
+
+#include <powermanager/PowerHalLoader.h>
+
+using IPowerV1_1 = android::hardware::power::V1_1::IPower;
+using IPowerV1_0 = android::hardware::power::V1_0::IPower;
+using IPowerAidl = android::hardware::power::IPower;
+
+namespace android {
+
+// -------------------------------------------------------------------------------------------------
+
+template <typename T, typename F>
+sp<T> loadHal(bool& exists, sp<T>& hal, F& loadFn, const char* halName) {
+    if (!exists) {
+        return nullptr;
+    }
+    if (hal) {
+        return hal;
+    }
+    hal = loadFn();
+    if (hal) {
+        ALOGV("Successfully connected to Power HAL %s service.", halName);
+    } else {
+        ALOGV("Power HAL %s service not available.", halName);
+        exists = false;
+    }
+    return hal;
+}
+
+// -------------------------------------------------------------------------------------------------
+
+std::mutex PowerHalLoader::gHalMutex;
+sp<IPowerAidl> PowerHalLoader::gHalAidl = nullptr;
+sp<IPowerV1_0> PowerHalLoader::gHalHidlV1_0 = nullptr;
+sp<IPowerV1_1> PowerHalLoader::gHalHidlV1_1 = nullptr;
+
+void PowerHalLoader::unloadAll() {
+    std::lock_guard<std::mutex> lock(gHalMutex);
+    gHalAidl = nullptr;
+    gHalHidlV1_0 = nullptr;
+    gHalHidlV1_1 = nullptr;
+}
+
+sp<IPowerAidl> PowerHalLoader::loadAidl() {
+    std::lock_guard<std::mutex> lock(gHalMutex);
+    static bool gHalExists = true;
+    static auto loadFn = []() { return waitForVintfService<IPowerAidl>(); };
+    return loadHal<IPowerAidl>(gHalExists, gHalAidl, loadFn, "AIDL");
+}
+
+sp<IPowerV1_0> PowerHalLoader::loadHidlV1_0() {
+    std::lock_guard<std::mutex> lock(gHalMutex);
+    return loadHidlV1_0Locked();
+}
+
+sp<IPowerV1_1> PowerHalLoader::loadHidlV1_1() {
+    std::lock_guard<std::mutex> lock(gHalMutex);
+    static bool gHalExists = true;
+    static auto loadFn = []() { return IPowerV1_1::castFrom(loadHidlV1_0Locked()); };
+    return loadHal<IPowerV1_1>(gHalExists, gHalHidlV1_1, loadFn, "HIDL v1.1");
+}
+
+sp<IPowerV1_0> PowerHalLoader::loadHidlV1_0Locked() {
+    static bool gHalExists = true;
+    static auto loadFn = []() { return IPowerV1_0::getService(); };
+    return loadHal<IPowerV1_0>(gHalExists, gHalHidlV1_0, loadFn, "HIDL v1.0");
+}
+
+// -------------------------------------------------------------------------------------------------
+
+} // namespace android