1 /*
2 * Copyright (C) 2020 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 #define LOG_TAG "PowerHalLoader"
18
19 #include <android/hardware/power/1.1/IPower.h>
20 #include <android/hardware/power/IPower.h>
21 #include <binder/IServiceManager.h>
22 #include <hardware/power.h>
23 #include <hardware_legacy/power.h>
24 #include <powermanager/PowerHalLoader.h>
25
26 using namespace android::hardware::power;
27
28 namespace android {
29
30 namespace power {
31
32 // -------------------------------------------------------------------------------------------------
33
34 template <typename T, typename F>
loadHal(bool & exists,sp<T> & hal,F & loadFn,const char * halName)35 sp<T> loadHal(bool& exists, sp<T>& hal, F& loadFn, const char* halName) {
36 if (!exists) {
37 return nullptr;
38 }
39 if (hal) {
40 return hal;
41 }
42 hal = loadFn();
43 if (hal) {
44 ALOGV("Successfully connected to Power HAL %s service.", halName);
45 } else {
46 ALOGV("Power HAL %s service not available.", halName);
47 exists = false;
48 }
49 return hal;
50 }
51
52 // -------------------------------------------------------------------------------------------------
53
54 std::mutex PowerHalLoader::gHalMutex;
55 sp<IPower> PowerHalLoader::gHalAidl = nullptr;
56 sp<V1_0::IPower> PowerHalLoader::gHalHidlV1_0 = nullptr;
57 sp<V1_1::IPower> PowerHalLoader::gHalHidlV1_1 = nullptr;
58
unloadAll()59 void PowerHalLoader::unloadAll() {
60 std::lock_guard<std::mutex> lock(gHalMutex);
61 gHalAidl = nullptr;
62 gHalHidlV1_0 = nullptr;
63 gHalHidlV1_1 = nullptr;
64 }
65
loadAidl()66 sp<IPower> PowerHalLoader::loadAidl() {
67 std::lock_guard<std::mutex> lock(gHalMutex);
68 static bool gHalExists = true;
69 static auto loadFn = []() { return waitForVintfService<IPower>(); };
70 return loadHal<IPower>(gHalExists, gHalAidl, loadFn, "AIDL");
71 }
72
loadHidlV1_0()73 sp<V1_0::IPower> PowerHalLoader::loadHidlV1_0() {
74 std::lock_guard<std::mutex> lock(gHalMutex);
75 return loadHidlV1_0Locked();
76 }
77
loadHidlV1_1()78 sp<V1_1::IPower> PowerHalLoader::loadHidlV1_1() {
79 std::lock_guard<std::mutex> lock(gHalMutex);
80 static bool gHalExists = true;
81 static auto loadFn = []() { return V1_1::IPower::castFrom(loadHidlV1_0Locked()); };
82 return loadHal<V1_1::IPower>(gHalExists, gHalHidlV1_1, loadFn, "HIDL v1.1");
83 }
84
loadHidlV1_0Locked()85 sp<V1_0::IPower> PowerHalLoader::loadHidlV1_0Locked() {
86 static bool gHalExists = true;
87 static auto loadFn = []() { return V1_0::IPower::getService(); };
88 return loadHal<V1_0::IPower>(gHalExists, gHalHidlV1_0, loadFn, "HIDL v1.0");
89 }
90
91 // -------------------------------------------------------------------------------------------------
92
93 } // namespace power
94
95 } // namespace android
96