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      1 /*
      2  * Copyright (C) 2018 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 <mutex>
     18 #include <unistd.h>
     19 
     20 #include <binder/Binder.h>
     21 #include <binder/IServiceManager.h>
     22 #include <sensorprivacy/SensorPrivacyManager.h>
     23 
     24 #include <utils/SystemClock.h>
     25 
     26 namespace android {
     27 
     28 SensorPrivacyManager::SensorPrivacyManager()
     29 {
     30 }
     31 
     32 sp<hardware::ISensorPrivacyManager> SensorPrivacyManager::getService()
     33 {
     34     std::lock_guard<Mutex> scoped_lock(mLock);
     35     int64_t startTime = 0;
     36     sp<hardware::ISensorPrivacyManager> service = mService;
     37     while (service == nullptr || !IInterface::asBinder(service)->isBinderAlive()) {
     38         sp<IBinder> binder = defaultServiceManager()->checkService(String16("sensor_privacy"));
     39         if (binder == nullptr) {
     40             // Wait for the sensor privacy service to come back...
     41             if (startTime == 0) {
     42                 startTime = uptimeMillis();
     43                 ALOGI("Waiting for sensor privacy service");
     44             } else if ((uptimeMillis() - startTime) > 1000000) {
     45                 ALOGW("Waiting too long for sensor privacy service, giving up");
     46                 service = nullptr;
     47                 break;
     48             }
     49             usleep(25000);
     50         } else {
     51             service = interface_cast<hardware::ISensorPrivacyManager>(binder);
     52             mService = service;
     53         }
     54     }
     55     return service;
     56 }
     57 
     58 void SensorPrivacyManager::addSensorPrivacyListener(
     59         const sp<hardware::ISensorPrivacyListener>& listener)
     60 {
     61     sp<hardware::ISensorPrivacyManager> service = getService();
     62     if (service != nullptr) {
     63         service->addSensorPrivacyListener(listener);
     64     }
     65 }
     66 
     67 void SensorPrivacyManager::removeSensorPrivacyListener(
     68         const sp<hardware::ISensorPrivacyListener>& listener)
     69 {
     70     sp<hardware::ISensorPrivacyManager> service = getService();
     71     if (service != nullptr) {
     72         service->removeSensorPrivacyListener(listener);
     73     }
     74 }
     75 
     76 bool SensorPrivacyManager::isSensorPrivacyEnabled()
     77 {
     78     sp<hardware::ISensorPrivacyManager> service = getService();
     79     if (service != nullptr) {
     80         bool result;
     81         service->isSensorPrivacyEnabled(&result);
     82         return result;
     83     }
     84     // if the SensorPrivacyManager is not available then assume sensor privacy is disabled
     85     return false;
     86 }
     87 
     88 status_t SensorPrivacyManager::linkToDeath(const sp<IBinder::DeathRecipient>& recipient)
     89 {
     90     sp<hardware::ISensorPrivacyManager> service = getService();
     91     if (service != nullptr) {
     92         return IInterface::asBinder(service)->linkToDeath(recipient);
     93     }
     94     return INVALID_OPERATION;
     95 }
     96 
     97 status_t SensorPrivacyManager::unlinkToDeath(const sp<IBinder::DeathRecipient>& recipient)
     98 {
     99     sp<hardware::ISensorPrivacyManager> service = getService();
    100     if (service != nullptr) {
    101         return IInterface::asBinder(service)->unlinkToDeath(recipient);
    102     }
    103     return INVALID_OPERATION;
    104 }
    105 
    106 }; // namespace android
    107