SensorManager.cpp revision b37ba399c1521c3eba40e126f65d9663532de446
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// ---------------------------------------------------------------------------- 36namespace android { 37// ---------------------------------------------------------------------------- 38 39ANDROID_SINGLETON_STATIC_INSTANCE(SensorManager) 40 41SensorManager::SensorManager() 42 : mSensorList(0) 43{ 44 // okay we're not locked here, but it's not needed during construction 45 assertStateLocked(); 46} 47 48SensorManager::~SensorManager() 49{ 50 free(mSensorList); 51} 52 53void SensorManager::sensorManagerDied() 54{ 55 Mutex::Autolock _l(mLock); 56 mSensorServer.clear(); 57 free(mSensorList); 58 mSensorList = NULL; 59 mSensors.clear(); 60} 61 62status_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 ALOGW("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 104ssize_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 115Sensor const* SensorManager::getDefaultSensor(int type) 116{ 117 Mutex::Autolock _l(mLock); 118 if (assertStateLocked() == NO_ERROR) { 119 bool wakeUpSensor = false; 120 // For the following sensor types, return a wake-up sensor. These types are by default 121 // defined as wake-up sensors. For the rest of the sensor types defined in sensors.h return 122 // a non_wake-up version. 123 if (type == SENSOR_TYPE_PROXIMITY || type == SENSOR_TYPE_SIGNIFICANT_MOTION || 124 type == SENSOR_TYPE_TILT_DETECTOR || type == SENSOR_TYPE_WAKE_GESTURE || 125 type == SENSOR_TYPE_GLANCE_GESTURE || type == SENSOR_TYPE_PICK_UP_GESTURE) { 126 wakeUpSensor = true; 127 } 128 // For now we just return the first sensor of that type we find. 129 // in the future it will make sense to let the SensorService make 130 // that decision. 131 for (size_t i=0 ; i<mSensors.size() ; i++) { 132 if (mSensorList[i]->getType() == type && 133 mSensorList[i]->isWakeUpSensor() == wakeUpSensor) { 134 return mSensorList[i]; 135 } 136 } 137 } 138 return NULL; 139} 140 141sp<SensorEventQueue> SensorManager::createEventQueue() 142{ 143 sp<SensorEventQueue> queue; 144 145 Mutex::Autolock _l(mLock); 146 while (assertStateLocked() == NO_ERROR) { 147 sp<ISensorEventConnection> connection = 148 mSensorServer->createSensorEventConnection(); 149 if (connection == NULL) { 150 // SensorService just died. 151 ALOGE("createEventQueue: connection is NULL. SensorService died."); 152 continue; 153 } 154 queue = new SensorEventQueue(connection); 155 break; 156 } 157 return queue; 158} 159 160// ---------------------------------------------------------------------------- 161}; // namespace android 162