android_hardware_SensorManager.cpp revision 27900358f2f5b89e8b01516b28a916d16c99ba9b
1/* 2 * Copyright 2008, 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 "SensorManager" 18 19#include <utils/Log.h> 20#include <utils/Looper.h> 21 22#include <gui/Sensor.h> 23#include <gui/SensorManager.h> 24#include <gui/SensorEventQueue.h> 25 26#include "jni.h" 27#include "JNIHelp.h" 28#include "android_os_MessageQueue.h" 29#include <android_runtime/AndroidRuntime.h> 30 31static struct { 32 jclass clazz; 33 jmethodID dispatchSensorEvent; 34 jmethodID dispatchFlushCompleteEvent; 35} gBaseEventQueueClassInfo; 36 37namespace android { 38 39struct SensorOffsets 40{ 41 jfieldID name; 42 jfieldID vendor; 43 jfieldID version; 44 jfieldID handle; 45 jfieldID type; 46 jfieldID range; 47 jfieldID resolution; 48 jfieldID power; 49 jfieldID minDelay; 50 jfieldID fifoReservedEventCount; 51 jfieldID fifoMaxEventCount; 52 jfieldID stringType; 53 jfieldID requiredPermission; 54 jfieldID maxDelay; 55 jfieldID flags; 56} gSensorOffsets; 57 58 59/* 60 * The method below are not thread-safe and not intended to be 61 */ 62 63static void 64nativeClassInit (JNIEnv *_env, jclass _this) 65{ 66 jclass sensorClass = _env->FindClass("android/hardware/Sensor"); 67 SensorOffsets& sensorOffsets = gSensorOffsets; 68 sensorOffsets.name = _env->GetFieldID(sensorClass, "mName", "Ljava/lang/String;"); 69 sensorOffsets.vendor = _env->GetFieldID(sensorClass, "mVendor", "Ljava/lang/String;"); 70 sensorOffsets.version = _env->GetFieldID(sensorClass, "mVersion", "I"); 71 sensorOffsets.handle = _env->GetFieldID(sensorClass, "mHandle", "I"); 72 sensorOffsets.type = _env->GetFieldID(sensorClass, "mType", "I"); 73 sensorOffsets.range = _env->GetFieldID(sensorClass, "mMaxRange", "F"); 74 sensorOffsets.resolution = _env->GetFieldID(sensorClass, "mResolution","F"); 75 sensorOffsets.power = _env->GetFieldID(sensorClass, "mPower", "F"); 76 sensorOffsets.minDelay = _env->GetFieldID(sensorClass, "mMinDelay", "I"); 77 sensorOffsets.fifoReservedEventCount = 78 _env->GetFieldID(sensorClass, "mFifoReservedEventCount", "I"); 79 sensorOffsets.fifoMaxEventCount = _env->GetFieldID(sensorClass, "mFifoMaxEventCount", "I"); 80 sensorOffsets.stringType = _env->GetFieldID(sensorClass, "mStringType", "Ljava/lang/String;"); 81 sensorOffsets.requiredPermission = _env->GetFieldID(sensorClass, "mRequiredPermission", 82 "Ljava/lang/String;"); 83 sensorOffsets.maxDelay = _env->GetFieldID(sensorClass, "mMaxDelay", "I"); 84 sensorOffsets.flags = _env->GetFieldID(sensorClass, "mFlags", "I"); 85} 86 87static jint 88nativeGetNextSensor(JNIEnv *env, jclass clazz, jobject sensor, jint next) 89{ 90 SensorManager& mgr(SensorManager::getInstance()); 91 92 Sensor const* const* sensorList; 93 size_t count = mgr.getSensorList(&sensorList); 94 if (size_t(next) >= count) 95 return -1; 96 97 Sensor const* const list = sensorList[next]; 98 const SensorOffsets& sensorOffsets(gSensorOffsets); 99 jstring name = env->NewStringUTF(list->getName().string()); 100 jstring vendor = env->NewStringUTF(list->getVendor().string()); 101 jstring stringType = env->NewStringUTF(list->getStringType().string()); 102 jstring requiredPermission = env->NewStringUTF(list->getRequiredPermission().string()); 103 env->SetObjectField(sensor, sensorOffsets.name, name); 104 env->SetObjectField(sensor, sensorOffsets.vendor, vendor); 105 env->SetIntField(sensor, sensorOffsets.version, list->getVersion()); 106 env->SetIntField(sensor, sensorOffsets.handle, list->getHandle()); 107 env->SetIntField(sensor, sensorOffsets.type, list->getType()); 108 env->SetFloatField(sensor, sensorOffsets.range, list->getMaxValue()); 109 env->SetFloatField(sensor, sensorOffsets.resolution, list->getResolution()); 110 env->SetFloatField(sensor, sensorOffsets.power, list->getPowerUsage()); 111 env->SetIntField(sensor, sensorOffsets.minDelay, list->getMinDelay()); 112 env->SetIntField(sensor, sensorOffsets.fifoReservedEventCount, 113 list->getFifoReservedEventCount()); 114 env->SetIntField(sensor, sensorOffsets.fifoMaxEventCount, 115 list->getFifoMaxEventCount()); 116 env->SetObjectField(sensor, sensorOffsets.stringType, stringType); 117 env->SetObjectField(sensor, sensorOffsets.requiredPermission, 118 requiredPermission); 119 env->SetIntField(sensor, sensorOffsets.maxDelay, list->getMaxDelay()); 120 env->SetIntField(sensor, sensorOffsets.flags, list->getFlags()); 121 next++; 122 return size_t(next) < count ? next : 0; 123} 124 125//---------------------------------------------------------------------------- 126 127class Receiver : public LooperCallback { 128 sp<SensorEventQueue> mSensorQueue; 129 sp<MessageQueue> mMessageQueue; 130 jobject mReceiverObject; 131 jfloatArray mScratch; 132public: 133 Receiver(const sp<SensorEventQueue>& sensorQueue, 134 const sp<MessageQueue>& messageQueue, 135 jobject receiverObject, jfloatArray scratch) { 136 JNIEnv* env = AndroidRuntime::getJNIEnv(); 137 mSensorQueue = sensorQueue; 138 mMessageQueue = messageQueue; 139 mReceiverObject = env->NewGlobalRef(receiverObject); 140 mScratch = (jfloatArray)env->NewGlobalRef(scratch); 141 } 142 ~Receiver() { 143 JNIEnv* env = AndroidRuntime::getJNIEnv(); 144 env->DeleteGlobalRef(mReceiverObject); 145 env->DeleteGlobalRef(mScratch); 146 } 147 sp<SensorEventQueue> getSensorEventQueue() const { 148 return mSensorQueue; 149 } 150 151 void destroy() { 152 mMessageQueue->getLooper()->removeFd( mSensorQueue->getFd() ); 153 } 154 155private: 156 virtual void onFirstRef() { 157 LooperCallback::onFirstRef(); 158 mMessageQueue->getLooper()->addFd(mSensorQueue->getFd(), 0, 159 ALOOPER_EVENT_INPUT, this, mSensorQueue.get()); 160 } 161 162 virtual int handleEvent(int fd, int events, void* data) { 163 JNIEnv* env = AndroidRuntime::getJNIEnv(); 164 sp<SensorEventQueue> q = reinterpret_cast<SensorEventQueue *>(data); 165 ssize_t n; 166 ASensorEvent buffer[16]; 167 while ((n = q->read(buffer, 16)) > 0) { 168 for (int i=0 ; i<n ; i++) { 169 if (buffer[i].type == SENSOR_TYPE_STEP_COUNTER || 170 buffer[i].type == SENSOR_TYPE_WAKE_UP_STEP_COUNTER) { 171 // step-counter returns a uint64, but the java API only deals with floats 172 float value = float(buffer[i].u64.step_counter); 173 env->SetFloatArrayRegion(mScratch, 0, 1, &value); 174 } else { 175 env->SetFloatArrayRegion(mScratch, 0, 16, buffer[i].data); 176 } 177 178 if (buffer[i].type == SENSOR_TYPE_META_DATA) { 179 // This is a flush complete sensor event. Call dispatchFlushCompleteEvent 180 // method. 181 env->CallVoidMethod(mReceiverObject, 182 gBaseEventQueueClassInfo.dispatchFlushCompleteEvent, 183 buffer[i].meta_data.sensor); 184 } else { 185 int8_t status; 186 switch (buffer[i].type) { 187 case SENSOR_TYPE_ORIENTATION: 188 case SENSOR_TYPE_MAGNETIC_FIELD: 189 case SENSOR_TYPE_ACCELEROMETER: 190 case SENSOR_TYPE_GYROSCOPE: 191 status = buffer[i].vector.status; 192 break; 193 case SENSOR_TYPE_HEART_RATE: 194 status = buffer[i].heart_rate.status; 195 break; 196 default: 197 status = SENSOR_STATUS_ACCURACY_HIGH; 198 break; 199 } 200 env->CallVoidMethod(mReceiverObject, 201 gBaseEventQueueClassInfo.dispatchSensorEvent, 202 buffer[i].sensor, 203 mScratch, 204 status, 205 buffer[i].timestamp); 206 } 207 if (env->ExceptionCheck()) { 208 mSensorQueue->sendAck(buffer, n); 209 ALOGE("Exception dispatching input event."); 210 return 1; 211 } 212 } 213 mSensorQueue->sendAck(buffer, n); 214 } 215 if (n<0 && n != -EAGAIN) { 216 // FIXME: error receiving events, what to do in this case? 217 } 218 return 1; 219 } 220}; 221 222static jlong nativeInitSensorEventQueue(JNIEnv *env, jclass clazz, jobject eventQ, jobject msgQ, jfloatArray scratch) { 223 SensorManager& mgr(SensorManager::getInstance()); 224 sp<SensorEventQueue> queue(mgr.createEventQueue()); 225 226 sp<MessageQueue> messageQueue = android_os_MessageQueue_getMessageQueue(env, msgQ); 227 if (messageQueue == NULL) { 228 jniThrowRuntimeException(env, "MessageQueue is not initialized."); 229 return 0; 230 } 231 232 sp<Receiver> receiver = new Receiver(queue, messageQueue, eventQ, scratch); 233 receiver->incStrong((void*)nativeInitSensorEventQueue); 234 return jlong(receiver.get()); 235} 236 237static jint nativeEnableSensor(JNIEnv *env, jclass clazz, jlong eventQ, jint handle, jint rate_us, 238 jint maxBatchReportLatency, jint reservedFlags) { 239 sp<Receiver> receiver(reinterpret_cast<Receiver *>(eventQ)); 240 return receiver->getSensorEventQueue()->enableSensor(handle, rate_us, maxBatchReportLatency, 241 reservedFlags); 242} 243 244static jint nativeDisableSensor(JNIEnv *env, jclass clazz, jlong eventQ, jint handle) { 245 sp<Receiver> receiver(reinterpret_cast<Receiver *>(eventQ)); 246 return receiver->getSensorEventQueue()->disableSensor(handle); 247} 248 249static void nativeDestroySensorEventQueue(JNIEnv *env, jclass clazz, jlong eventQ, jint handle) { 250 sp<Receiver> receiver(reinterpret_cast<Receiver *>(eventQ)); 251 receiver->destroy(); 252 receiver->decStrong((void*)nativeInitSensorEventQueue); 253} 254 255static jint nativeFlushSensor(JNIEnv *env, jclass clazz, jlong eventQ) { 256 sp<Receiver> receiver(reinterpret_cast<Receiver *>(eventQ)); 257 return receiver->getSensorEventQueue()->flush(); 258} 259 260//---------------------------------------------------------------------------- 261 262static JNINativeMethod gSystemSensorManagerMethods[] = { 263 {"nativeClassInit", 264 "()V", 265 (void*)nativeClassInit }, 266 267 {"nativeGetNextSensor", 268 "(Landroid/hardware/Sensor;I)I", 269 (void*)nativeGetNextSensor }, 270}; 271 272static JNINativeMethod gBaseEventQueueMethods[] = { 273 {"nativeInitBaseEventQueue", 274 "(Landroid/hardware/SystemSensorManager$BaseEventQueue;Landroid/os/MessageQueue;[F)J", 275 (void*)nativeInitSensorEventQueue }, 276 277 {"nativeEnableSensor", 278 "(JIIII)I", 279 (void*)nativeEnableSensor }, 280 281 {"nativeDisableSensor", 282 "(JI)I", 283 (void*)nativeDisableSensor }, 284 285 {"nativeDestroySensorEventQueue", 286 "(J)V", 287 (void*)nativeDestroySensorEventQueue }, 288 289 {"nativeFlushSensor", 290 "(J)I", 291 (void*)nativeFlushSensor }, 292}; 293 294}; // namespace android 295 296using namespace android; 297 298#define FIND_CLASS(var, className) \ 299 var = env->FindClass(className); \ 300 LOG_FATAL_IF(! var, "Unable to find class " className); \ 301 var = jclass(env->NewGlobalRef(var)); 302 303#define GET_METHOD_ID(var, clazz, methodName, methodDescriptor) \ 304 var = env->GetMethodID(clazz, methodName, methodDescriptor); \ 305 LOG_FATAL_IF(! var, "Unable to find method " methodName); 306 307int register_android_hardware_SensorManager(JNIEnv *env) 308{ 309 jniRegisterNativeMethods(env, "android/hardware/SystemSensorManager", 310 gSystemSensorManagerMethods, NELEM(gSystemSensorManagerMethods)); 311 312 jniRegisterNativeMethods(env, "android/hardware/SystemSensorManager$BaseEventQueue", 313 gBaseEventQueueMethods, NELEM(gBaseEventQueueMethods)); 314 315 FIND_CLASS(gBaseEventQueueClassInfo.clazz, "android/hardware/SystemSensorManager$BaseEventQueue"); 316 317 GET_METHOD_ID(gBaseEventQueueClassInfo.dispatchSensorEvent, 318 gBaseEventQueueClassInfo.clazz, 319 "dispatchSensorEvent", "(I[FIJ)V"); 320 321 GET_METHOD_ID(gBaseEventQueueClassInfo.dispatchFlushCompleteEvent, 322 gBaseEventQueueClassInfo.clazz, 323 "dispatchFlushCompleteEvent", "(I)V"); 324 325 return 0; 326} 327