1 /* 2 * Copyright (C) 2010 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 "Sensors" 18 19 #include <stdint.h> 20 #include <sys/types.h> 21 22 #include <utils/Errors.h> 23 #include <utils/RefBase.h> 24 #include <utils/Singleton.h> 25 26 #include <binder/IBinder.h> 27 #include <binder/IServiceManager.h> 28 29 #include <gui/ISensorServer.h> 30 #include <gui/ISensorEventConnection.h> 31 #include <gui/Sensor.h> 32 #include <gui/SensorManager.h> 33 #include <gui/SensorEventQueue.h> 34 35 // ---------------------------------------------------------------------------- 36 namespace android { 37 // ---------------------------------------------------------------------------- 38 ANDROID_SINGLETON_STATIC_INSTANCE(SensorManager)39ANDROID_SINGLETON_STATIC_INSTANCE(SensorManager) 40 41 SensorManager::SensorManager() 42 : mSensorList(0) 43 { 44 // okay we're not locked here, but it's not needed during construction 45 assertStateLocked(); 46 } 47 ~SensorManager()48SensorManager::~SensorManager() 49 { 50 free(mSensorList); 51 } 52 sensorManagerDied()53void SensorManager::sensorManagerDied() 54 { 55 Mutex::Autolock _l(mLock); 56 mSensorServer.clear(); 57 free(mSensorList); 58 mSensorList = NULL; 59 mSensors.clear(); 60 } 61 assertStateLocked() const62status_t SensorManager::assertStateLocked() const { 63 if (mSensorServer == NULL) { 64 // try for one second 65 const String16 name("sensorservice"); 66 for (int i=0 ; i<4 ; i++) { 67 status_t err = getService(name, &mSensorServer); 68 if (err == NAME_NOT_FOUND) { 69 usleep(250000); 70 continue; 71 } 72 if (err != NO_ERROR) { 73 return err; 74 } 75 break; 76 } 77 78 class DeathObserver : public IBinder::DeathRecipient { 79 SensorManager& mSensorManger; 80 virtual void binderDied(const wp<IBinder>& who) { 81 LOGW("sensorservice died [%p]", who.unsafe_get()); 82 mSensorManger.sensorManagerDied(); 83 } 84 public: 85 DeathObserver(SensorManager& mgr) : mSensorManger(mgr) { } 86 }; 87 88 mDeathObserver = new DeathObserver(*const_cast<SensorManager *>(this)); 89 mSensorServer->asBinder()->linkToDeath(mDeathObserver); 90 91 mSensors = mSensorServer->getSensorList(); 92 size_t count = mSensors.size(); 93 mSensorList = (Sensor const**)malloc(count * sizeof(Sensor*)); 94 for (size_t i=0 ; i<count ; i++) { 95 mSensorList[i] = mSensors.array() + i; 96 } 97 } 98 99 return NO_ERROR; 100 } 101 102 103 getSensorList(Sensor const * const ** list) const104ssize_t SensorManager::getSensorList(Sensor const* const** list) const 105 { 106 Mutex::Autolock _l(mLock); 107 status_t err = assertStateLocked(); 108 if (err < 0) { 109 return ssize_t(err); 110 } 111 *list = mSensorList; 112 return mSensors.size(); 113 } 114 getDefaultSensor(int type)115Sensor const* SensorManager::getDefaultSensor(int type) 116 { 117 Mutex::Autolock _l(mLock); 118 if (assertStateLocked() == NO_ERROR) { 119 // For now we just return the first sensor of that type we find. 120 // in the future it will make sense to let the SensorService make 121 // that decision. 122 for (size_t i=0 ; i<mSensors.size() ; i++) { 123 if (mSensorList[i]->getType() == type) 124 return mSensorList[i]; 125 } 126 } 127 return NULL; 128 } 129 createEventQueue()130sp<SensorEventQueue> SensorManager::createEventQueue() 131 { 132 sp<SensorEventQueue> queue; 133 134 Mutex::Autolock _l(mLock); 135 while (assertStateLocked() == NO_ERROR) { 136 sp<ISensorEventConnection> connection = 137 mSensorServer->createSensorEventConnection(); 138 if (connection == NULL) { 139 // SensorService just died. 140 LOGE("createEventQueue: connection is NULL. SensorService died."); 141 continue; 142 } 143 queue = new SensorEventQueue(connection); 144 break; 145 } 146 return queue; 147 } 148 149 // ---------------------------------------------------------------------------- 150 }; // namespace android 151