android_hardware_SensorManager.cpp revision af80510e85b301c8d8ba1e28e7edc7a0c9156a1a
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} gSensorOffsets; 55 56 57/* 58 * The method below are not thread-safe and not intended to be 59 */ 60 61static void 62nativeClassInit (JNIEnv *_env, jclass _this) 63{ 64 jclass sensorClass = _env->FindClass("android/hardware/Sensor"); 65 SensorOffsets& sensorOffsets = gSensorOffsets; 66 sensorOffsets.name = _env->GetFieldID(sensorClass, "mName", "Ljava/lang/String;"); 67 sensorOffsets.vendor = _env->GetFieldID(sensorClass, "mVendor", "Ljava/lang/String;"); 68 sensorOffsets.version = _env->GetFieldID(sensorClass, "mVersion", "I"); 69 sensorOffsets.handle = _env->GetFieldID(sensorClass, "mHandle", "I"); 70 sensorOffsets.type = _env->GetFieldID(sensorClass, "mType", "I"); 71 sensorOffsets.range = _env->GetFieldID(sensorClass, "mMaxRange", "F"); 72 sensorOffsets.resolution = _env->GetFieldID(sensorClass, "mResolution","F"); 73 sensorOffsets.power = _env->GetFieldID(sensorClass, "mPower", "F"); 74 sensorOffsets.minDelay = _env->GetFieldID(sensorClass, "mMinDelay", "I"); 75 sensorOffsets.fifoReservedEventCount = 76 _env->GetFieldID(sensorClass, "mFifoReservedEventCount", "I"); 77 sensorOffsets.fifoMaxEventCount = _env->GetFieldID(sensorClass, "mFifoMaxEventCount", "I"); 78 sensorOffsets.stringType = _env->GetFieldID(sensorClass, "mStringType", "Ljava/lang/String;"); 79 sensorOffsets.requiredPermission = _env->GetFieldID(sensorClass, "mRequiredPermission", 80 "Ljava/lang/String;"); 81} 82 83static jint 84nativeGetNextSensor(JNIEnv *env, jclass clazz, jobject sensor, jint next) 85{ 86 SensorManager& mgr(SensorManager::getInstance()); 87 88 Sensor const* const* sensorList; 89 size_t count = mgr.getSensorList(&sensorList); 90 if (size_t(next) >= count) 91 return -1; 92 93 Sensor const* const list = sensorList[next]; 94 const SensorOffsets& sensorOffsets(gSensorOffsets); 95 jstring name = env->NewStringUTF(list->getName().string()); 96 jstring vendor = env->NewStringUTF(list->getVendor().string()); 97 jstring stringType = env->NewStringUTF(list->getStringType().string()); 98 jstring requiredPermission = env->NewStringUTF(list->getRequiredPermission().string()); 99 env->SetObjectField(sensor, sensorOffsets.name, name); 100 env->SetObjectField(sensor, sensorOffsets.vendor, vendor); 101 env->SetIntField(sensor, sensorOffsets.version, list->getVersion()); 102 env->SetIntField(sensor, sensorOffsets.handle, list->getHandle()); 103 env->SetIntField(sensor, sensorOffsets.type, list->getType()); 104 env->SetFloatField(sensor, sensorOffsets.range, list->getMaxValue()); 105 env->SetFloatField(sensor, sensorOffsets.resolution, list->getResolution()); 106 env->SetFloatField(sensor, sensorOffsets.power, list->getPowerUsage()); 107 env->SetIntField(sensor, sensorOffsets.minDelay, list->getMinDelay()); 108 env->SetIntField(sensor, sensorOffsets.fifoReservedEventCount, 109 list->getFifoReservedEventCount()); 110 env->SetIntField(sensor, sensorOffsets.fifoMaxEventCount, 111 list->getFifoMaxEventCount()); 112 env->SetObjectField(sensor, sensorOffsets.stringType, stringType); 113 env->SetObjectField(sensor, sensorOffsets.requiredPermission, 114 requiredPermission); 115 next++; 116 return size_t(next) < count ? next : 0; 117} 118 119//---------------------------------------------------------------------------- 120 121class Receiver : public LooperCallback { 122 sp<SensorEventQueue> mSensorQueue; 123 sp<MessageQueue> mMessageQueue; 124 jobject mReceiverObject; 125 jfloatArray mScratch; 126public: 127 Receiver(const sp<SensorEventQueue>& sensorQueue, 128 const sp<MessageQueue>& messageQueue, 129 jobject receiverObject, jfloatArray scratch) { 130 JNIEnv* env = AndroidRuntime::getJNIEnv(); 131 mSensorQueue = sensorQueue; 132 mMessageQueue = messageQueue; 133 mReceiverObject = env->NewGlobalRef(receiverObject); 134 mScratch = (jfloatArray)env->NewGlobalRef(scratch); 135 } 136 ~Receiver() { 137 JNIEnv* env = AndroidRuntime::getJNIEnv(); 138 env->DeleteGlobalRef(mReceiverObject); 139 env->DeleteGlobalRef(mScratch); 140 } 141 sp<SensorEventQueue> getSensorEventQueue() const { 142 return mSensorQueue; 143 } 144 145 void destroy() { 146 mMessageQueue->getLooper()->removeFd( mSensorQueue->getFd() ); 147 } 148 149private: 150 virtual void onFirstRef() { 151 LooperCallback::onFirstRef(); 152 mMessageQueue->getLooper()->addFd(mSensorQueue->getFd(), 0, 153 ALOOPER_EVENT_INPUT, this, mSensorQueue.get()); 154 } 155 156 virtual int handleEvent(int fd, int events, void* data) { 157 JNIEnv* env = AndroidRuntime::getJNIEnv(); 158 sp<SensorEventQueue> q = reinterpret_cast<SensorEventQueue *>(data); 159 ssize_t n; 160 ASensorEvent buffer[16]; 161 while ((n = q->read(buffer, 16)) > 0) { 162 for (int i=0 ; i<n ; i++) { 163 164 if (buffer[i].type == SENSOR_TYPE_STEP_COUNTER) { 165 // step-counter returns a uint64, but the java API only deals with floats 166 float value = float(buffer[i].u64.step_counter); 167 env->SetFloatArrayRegion(mScratch, 0, 1, &value); 168 } else { 169 env->SetFloatArrayRegion(mScratch, 0, 16, buffer[i].data); 170 } 171 172 if (buffer[i].type == SENSOR_TYPE_META_DATA) { 173 // This is a flush complete sensor event. Call dispatchFlushCompleteEvent 174 // method. 175 env->CallVoidMethod(mReceiverObject, 176 gBaseEventQueueClassInfo.dispatchFlushCompleteEvent, 177 buffer[i].meta_data.sensor); 178 } else { 179 int8_t status; 180 switch (buffer[i].type) { 181 case SENSOR_TYPE_ORIENTATION: 182 case SENSOR_TYPE_MAGNETIC_FIELD: 183 case SENSOR_TYPE_ACCELEROMETER: 184 case SENSOR_TYPE_GYROSCOPE: 185 status = buffer[i].vector.status; 186 break; 187 case SENSOR_TYPE_HEART_RATE: 188 status = buffer[i].heart_rate.status; 189 break; 190 default: 191 status = SENSOR_STATUS_ACCURACY_HIGH; 192 break; 193 } 194 env->CallVoidMethod(mReceiverObject, 195 gBaseEventQueueClassInfo.dispatchSensorEvent, 196 buffer[i].sensor, 197 mScratch, 198 status, 199 buffer[i].timestamp); 200 } 201 202 if (env->ExceptionCheck()) { 203 ALOGE("Exception dispatching input event."); 204 return 1; 205 } 206 } 207 } 208 if (n<0 && n != -EAGAIN) { 209 // FIXME: error receiving events, what to do in this case? 210 } 211 212 return 1; 213 } 214}; 215 216static jlong nativeInitSensorEventQueue(JNIEnv *env, jclass clazz, jobject eventQ, jobject msgQ, jfloatArray scratch) { 217 SensorManager& mgr(SensorManager::getInstance()); 218 sp<SensorEventQueue> queue(mgr.createEventQueue()); 219 220 sp<MessageQueue> messageQueue = android_os_MessageQueue_getMessageQueue(env, msgQ); 221 if (messageQueue == NULL) { 222 jniThrowRuntimeException(env, "MessageQueue is not initialized."); 223 return 0; 224 } 225 226 sp<Receiver> receiver = new Receiver(queue, messageQueue, eventQ, scratch); 227 receiver->incStrong((void*)nativeInitSensorEventQueue); 228 return jlong(receiver.get()); 229} 230 231static jint nativeEnableSensor(JNIEnv *env, jclass clazz, jlong eventQ, jint handle, jint rate_us, 232 jint maxBatchReportLatency, jint reservedFlags) { 233 sp<Receiver> receiver(reinterpret_cast<Receiver *>(eventQ)); 234 return receiver->getSensorEventQueue()->enableSensor(handle, rate_us, maxBatchReportLatency, 235 reservedFlags); 236} 237 238static jint nativeDisableSensor(JNIEnv *env, jclass clazz, jlong eventQ, jint handle) { 239 sp<Receiver> receiver(reinterpret_cast<Receiver *>(eventQ)); 240 return receiver->getSensorEventQueue()->disableSensor(handle); 241} 242 243static void nativeDestroySensorEventQueue(JNIEnv *env, jclass clazz, jlong eventQ, jint handle) { 244 sp<Receiver> receiver(reinterpret_cast<Receiver *>(eventQ)); 245 receiver->destroy(); 246 receiver->decStrong((void*)nativeInitSensorEventQueue); 247} 248 249static jint nativeFlushSensor(JNIEnv *env, jclass clazz, jlong eventQ) { 250 sp<Receiver> receiver(reinterpret_cast<Receiver *>(eventQ)); 251 return receiver->getSensorEventQueue()->flush(); 252} 253 254//---------------------------------------------------------------------------- 255 256static JNINativeMethod gSystemSensorManagerMethods[] = { 257 {"nativeClassInit", 258 "()V", 259 (void*)nativeClassInit }, 260 261 {"nativeGetNextSensor", 262 "(Landroid/hardware/Sensor;I)I", 263 (void*)nativeGetNextSensor }, 264}; 265 266static JNINativeMethod gBaseEventQueueMethods[] = { 267 {"nativeInitBaseEventQueue", 268 "(Landroid/hardware/SystemSensorManager$BaseEventQueue;Landroid/os/MessageQueue;[F)J", 269 (void*)nativeInitSensorEventQueue }, 270 271 {"nativeEnableSensor", 272 "(JIIII)I", 273 (void*)nativeEnableSensor }, 274 275 {"nativeDisableSensor", 276 "(JI)I", 277 (void*)nativeDisableSensor }, 278 279 {"nativeDestroySensorEventQueue", 280 "(J)V", 281 (void*)nativeDestroySensorEventQueue }, 282 283 {"nativeFlushSensor", 284 "(J)I", 285 (void*)nativeFlushSensor }, 286}; 287 288}; // namespace android 289 290using namespace android; 291 292#define FIND_CLASS(var, className) \ 293 var = env->FindClass(className); \ 294 LOG_FATAL_IF(! var, "Unable to find class " className); \ 295 var = jclass(env->NewGlobalRef(var)); 296 297#define GET_METHOD_ID(var, clazz, methodName, methodDescriptor) \ 298 var = env->GetMethodID(clazz, methodName, methodDescriptor); \ 299 LOG_FATAL_IF(! var, "Unable to find method " methodName); 300 301int register_android_hardware_SensorManager(JNIEnv *env) 302{ 303 jniRegisterNativeMethods(env, "android/hardware/SystemSensorManager", 304 gSystemSensorManagerMethods, NELEM(gSystemSensorManagerMethods)); 305 306 jniRegisterNativeMethods(env, "android/hardware/SystemSensorManager$BaseEventQueue", 307 gBaseEventQueueMethods, NELEM(gBaseEventQueueMethods)); 308 309 FIND_CLASS(gBaseEventQueueClassInfo.clazz, "android/hardware/SystemSensorManager$BaseEventQueue"); 310 311 GET_METHOD_ID(gBaseEventQueueClassInfo.dispatchSensorEvent, 312 gBaseEventQueueClassInfo.clazz, 313 "dispatchSensorEvent", "(I[FIJ)V"); 314 315 GET_METHOD_ID(gBaseEventQueueClassInfo.dispatchFlushCompleteEvent, 316 gBaseEventQueueClassInfo.clazz, 317 "dispatchFlushCompleteEvent", "(I)V"); 318 319 return 0; 320} 321