1 /*
2  * Copyright (C) 2019 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 <memory>
18 #include <string_view>
19 
20 #include <health/utils.h>
21 #include <health2impl/Health.h>
22 
23 using ::android::sp;
24 using ::android::hardware::health::InitHealthdConfig;
25 using ::android::hardware::health::V2_1::IHealth;
26 using ::android::hardware::health::V2_1::implementation::Health;
27 
28 using namespace std::literals;
29 
30 // Passthrough implementation of the health service. Use default configuration.
31 // It does not invoke callbacks unless update() is called explicitly. No
32 // background thread is spawned to handle callbacks.
33 //
34 // The passthrough implementation is only allowed in recovery mode, charger, and
35 // opened by the hwbinder service.
36 // If Android is booted normally, the hwbinder service is used instead.
37 //
38 // This implementation only implements the "default" instance. It rejects
39 // other instance names.
40 // Note that the Android framework only reads values from the "default"
41 // health HAL 2.1 instance.
HIDL_FETCH_IHealth(const char * instance)42 extern "C" IHealth* HIDL_FETCH_IHealth(const char* instance) {
43     if (instance != "default"sv) {
44         return nullptr;
45     }
46     auto config = std::make_unique<healthd_config>();
47     InitHealthdConfig(config.get());
48 
49     // This implementation uses default config. If you want to customize it
50     // (e.g. with healthd_board_init), do it here.
51 
52     return new Health(std::move(config));
53 }
54