SensorService.cpp revision db5b4bce9e65ec9c2c7762b601297e4abadbc22a
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#include <stdint.h> 18#include <math.h> 19#include <sys/types.h> 20 21#include <utils/SortedVector.h> 22#include <utils/KeyedVector.h> 23#include <utils/threads.h> 24#include <utils/Atomic.h> 25#include <utils/Errors.h> 26#include <utils/RefBase.h> 27#include <utils/Singleton.h> 28#include <utils/String16.h> 29 30#include <binder/BinderService.h> 31#include <binder/IServiceManager.h> 32 33#include <gui/ISensorServer.h> 34#include <gui/ISensorEventConnection.h> 35 36#include <hardware/sensors.h> 37 38#include "SensorService.h" 39#include "GravitySensor.h" 40#include "LinearAccelerationSensor.h" 41#include "RotationVectorSensor.h" 42 43namespace android { 44// --------------------------------------------------------------------------- 45 46SensorService::SensorService() 47 : Thread(false), 48 mDump("android.permission.DUMP"), 49 mInitCheck(NO_INIT) 50{ 51} 52 53void SensorService::onFirstRef() 54{ 55 LOGD("nuSensorService starting..."); 56 57 SensorDevice& dev(SensorDevice::getInstance()); 58 59 if (dev.initCheck() == NO_ERROR) { 60 uint32_t virtualSensorsNeeds = 61 (1<<SENSOR_TYPE_GRAVITY) | 62 (1<<SENSOR_TYPE_LINEAR_ACCELERATION) | 63 (1<<SENSOR_TYPE_ROTATION_VECTOR); 64 sensor_t const* list; 65 int count = dev.getSensorList(&list); 66 mLastEventSeen.setCapacity(count); 67 for (int i=0 ; i<count ; i++) { 68 registerSensor( new HardwareSensor(list[i]) ); 69 switch (list[i].type) { 70 case SENSOR_TYPE_GRAVITY: 71 case SENSOR_TYPE_LINEAR_ACCELERATION: 72 case SENSOR_TYPE_ROTATION_VECTOR: 73 virtualSensorsNeeds &= ~(1<<list[i].type); 74 break; 75 } 76 } 77 78 if (virtualSensorsNeeds & (1<<SENSOR_TYPE_GRAVITY)) { 79 registerVirtualSensor( new GravitySensor(list, count) ); 80 } 81 if (virtualSensorsNeeds & (1<<SENSOR_TYPE_LINEAR_ACCELERATION)) { 82 registerVirtualSensor( new LinearAccelerationSensor(list, count) ); 83 } 84 if (virtualSensorsNeeds & (1<<SENSOR_TYPE_ROTATION_VECTOR)) { 85 registerVirtualSensor( new RotationVectorSensor(list, count) ); 86 } 87 88 run("SensorService", PRIORITY_URGENT_DISPLAY); 89 mInitCheck = NO_ERROR; 90 } 91} 92 93void SensorService::registerSensor(SensorInterface* s) 94{ 95 sensors_event_t event; 96 memset(&event, 0, sizeof(event)); 97 98 const Sensor sensor(s->getSensor()); 99 // add to the sensor list (returned to clients) 100 mSensorList.add(sensor); 101 // add to our handle->SensorInterface mapping 102 mSensorMap.add(sensor.getHandle(), s); 103 // create an entry in the mLastEventSeen array 104 mLastEventSeen.add(sensor.getHandle(), event); 105} 106 107void SensorService::registerVirtualSensor(SensorInterface* s) 108{ 109 registerSensor(s); 110 mVirtualSensorList.add( s ); 111} 112 113SensorService::~SensorService() 114{ 115 for (size_t i=0 ; i<mSensorMap.size() ; i++) 116 delete mSensorMap.valueAt(i); 117} 118 119status_t SensorService::dump(int fd, const Vector<String16>& args) 120{ 121 const size_t SIZE = 1024; 122 char buffer[SIZE]; 123 String8 result; 124 if (!mDump.checkCalling()) { 125 snprintf(buffer, SIZE, "Permission Denial: " 126 "can't dump SurfaceFlinger from pid=%d, uid=%d\n", 127 IPCThreadState::self()->getCallingPid(), 128 IPCThreadState::self()->getCallingUid()); 129 result.append(buffer); 130 } else { 131 Mutex::Autolock _l(mLock); 132 snprintf(buffer, SIZE, "Sensor List:\n"); 133 result.append(buffer); 134 for (size_t i=0 ; i<mSensorList.size() ; i++) { 135 const Sensor& s(mSensorList[i]); 136 const sensors_event_t& e(mLastEventSeen.valueFor(s.getHandle())); 137 snprintf(buffer, SIZE, "%-48s| %-32s | 0x%08x | maxRate=%7.2fHz | last=<%5.1f,%5.1f,%5.1f>\n", 138 s.getName().string(), 139 s.getVendor().string(), 140 s.getHandle(), 141 s.getMinDelay() ? (1000000.0f / s.getMinDelay()) : 0.0f, 142 e.data[0], e.data[1], e.data[2]); 143 result.append(buffer); 144 } 145 SensorDevice::getInstance().dump(result, buffer, SIZE); 146 147 snprintf(buffer, SIZE, "%d active connections\n", 148 mActiveConnections.size()); 149 result.append(buffer); 150 snprintf(buffer, SIZE, "Active sensors:\n"); 151 result.append(buffer); 152 for (size_t i=0 ; i<mActiveSensors.size() ; i++) { 153 int handle = mActiveSensors.keyAt(i); 154 snprintf(buffer, SIZE, "%s (handle=0x%08x, connections=%d)\n", 155 getSensorName(handle).string(), 156 handle, 157 mActiveSensors.valueAt(i)->getNumConnections()); 158 result.append(buffer); 159 } 160 } 161 write(fd, result.string(), result.size()); 162 return NO_ERROR; 163} 164 165bool SensorService::threadLoop() 166{ 167 LOGD("nuSensorService thread starting..."); 168 169 const size_t numEventMax = 16 * (1 + mVirtualSensorList.size()); 170 sensors_event_t buffer[numEventMax]; 171 sensors_event_t scratch[numEventMax]; 172 SensorDevice& device(SensorDevice::getInstance()); 173 const size_t vcount = mVirtualSensorList.size(); 174 175 ssize_t count; 176 do { 177 count = device.poll(buffer, numEventMax); 178 if (count<0) { 179 LOGE("sensor poll failed (%s)", strerror(-count)); 180 break; 181 } 182 183 recordLastValue(buffer, count); 184 185 // handle virtual sensors 186 if (count && vcount) { 187 const DefaultKeyedVector<int, SensorInterface*> virtualSensors( 188 getActiveVirtualSensors()); 189 const size_t activeVirtualSensorCount = virtualSensors.size(); 190 if (activeVirtualSensorCount) { 191 size_t k = 0; 192 for (size_t i=0 ; i<size_t(count) ; i++) { 193 sensors_event_t const * const event = buffer; 194 for (size_t j=0 ; j<activeVirtualSensorCount ; j++) { 195 sensors_event_t out; 196 if (virtualSensors.valueAt(j)->process(&out, event[i])) { 197 buffer[count + k] = out; 198 k++; 199 } 200 } 201 } 202 if (k) { 203 // record the last synthesized values 204 recordLastValue(&buffer[count], k); 205 count += k; 206 // sort the buffer by time-stamps 207 sortEventBuffer(buffer, count); 208 } 209 } 210 } 211 212 // send our events to clients... 213 const SortedVector< wp<SensorEventConnection> > activeConnections( 214 getActiveConnections()); 215 size_t numConnections = activeConnections.size(); 216 for (size_t i=0 ; i<numConnections ; i++) { 217 sp<SensorEventConnection> connection( 218 activeConnections[i].promote()); 219 if (connection != 0) { 220 connection->sendEvents(buffer, count, scratch); 221 } 222 } 223 } while (count >= 0 || Thread::exitPending()); 224 225 LOGW("Exiting SensorService::threadLoop!"); 226 return false; 227} 228 229void SensorService::recordLastValue( 230 sensors_event_t const * buffer, size_t count) 231{ 232 Mutex::Autolock _l(mLock); 233 234 // record the last event for each sensor 235 int32_t prev = buffer[0].sensor; 236 for (size_t i=1 ; i<count ; i++) { 237 // record the last event of each sensor type in this buffer 238 int32_t curr = buffer[i].sensor; 239 if (curr != prev) { 240 mLastEventSeen.editValueFor(prev) = buffer[i-1]; 241 prev = curr; 242 } 243 } 244 mLastEventSeen.editValueFor(prev) = buffer[count-1]; 245} 246 247void SensorService::sortEventBuffer(sensors_event_t* buffer, size_t count) 248{ 249 struct compar { 250 static int cmp(void const* lhs, void const* rhs) { 251 sensors_event_t const* l = static_cast<sensors_event_t const*>(lhs); 252 sensors_event_t const* r = static_cast<sensors_event_t const*>(rhs); 253 return r->timestamp - l->timestamp; 254 } 255 }; 256 qsort(buffer, count, sizeof(sensors_event_t), compar::cmp); 257} 258 259SortedVector< wp<SensorService::SensorEventConnection> > 260SensorService::getActiveConnections() const 261{ 262 Mutex::Autolock _l(mLock); 263 return mActiveConnections; 264} 265 266DefaultKeyedVector<int, SensorInterface*> 267SensorService::getActiveVirtualSensors() const 268{ 269 Mutex::Autolock _l(mLock); 270 return mActiveVirtualSensors; 271} 272 273String8 SensorService::getSensorName(int handle) const { 274 size_t count = mSensorList.size(); 275 for (size_t i=0 ; i<count ; i++) { 276 const Sensor& sensor(mSensorList[i]); 277 if (sensor.getHandle() == handle) { 278 return sensor.getName(); 279 } 280 } 281 String8 result("unknown"); 282 return result; 283} 284 285Vector<Sensor> SensorService::getSensorList() 286{ 287 return mSensorList; 288} 289 290sp<ISensorEventConnection> SensorService::createSensorEventConnection() 291{ 292 sp<SensorEventConnection> result(new SensorEventConnection(this)); 293 return result; 294} 295 296void SensorService::cleanupConnection(SensorEventConnection* c) 297{ 298 Mutex::Autolock _l(mLock); 299 const wp<SensorEventConnection> connection(c); 300 size_t size = mActiveSensors.size(); 301 for (size_t i=0 ; i<size ; ) { 302 int handle = mActiveSensors.keyAt(i); 303 if (c->hasSensor(handle)) { 304 SensorInterface* sensor = mSensorMap.valueFor( handle ); 305 if (sensor) { 306 sensor->activate(c, false); 307 } 308 } 309 SensorRecord* rec = mActiveSensors.valueAt(i); 310 if (rec && rec->removeConnection(connection)) { 311 mActiveSensors.removeItemsAt(i, 1); 312 mActiveVirtualSensors.removeItem(handle); 313 delete rec; 314 size--; 315 } else { 316 i++; 317 } 318 } 319 mActiveConnections.remove(connection); 320} 321 322status_t SensorService::enable(const sp<SensorEventConnection>& connection, 323 int handle) 324{ 325 if (mInitCheck != NO_ERROR) 326 return mInitCheck; 327 328 Mutex::Autolock _l(mLock); 329 SensorInterface* sensor = mSensorMap.valueFor(handle); 330 status_t err = sensor ? sensor->activate(connection.get(), true) : status_t(BAD_VALUE); 331 if (err == NO_ERROR) { 332 SensorRecord* rec = mActiveSensors.valueFor(handle); 333 if (rec == 0) { 334 rec = new SensorRecord(connection); 335 mActiveSensors.add(handle, rec); 336 if (sensor->isVirtual()) { 337 mActiveVirtualSensors.add(handle, sensor); 338 } 339 } else { 340 if (rec->addConnection(connection)) { 341 // this sensor is already activated, but we are adding a 342 // connection that uses it. Immediately send down the last 343 // known value of the requested sensor. 344 sensors_event_t scratch; 345 sensors_event_t& event(mLastEventSeen.editValueFor(handle)); 346 if (event.version == sizeof(sensors_event_t)) { 347 connection->sendEvents(&event, 1); 348 } 349 } 350 } 351 if (err == NO_ERROR) { 352 // connection now active 353 if (connection->addSensor(handle)) { 354 // the sensor was added (which means it wasn't already there) 355 // so, see if this connection becomes active 356 if (mActiveConnections.indexOf(connection) < 0) { 357 mActiveConnections.add(connection); 358 } 359 } 360 } 361 } 362 return err; 363} 364 365status_t SensorService::disable(const sp<SensorEventConnection>& connection, 366 int handle) 367{ 368 if (mInitCheck != NO_ERROR) 369 return mInitCheck; 370 371 status_t err = NO_ERROR; 372 Mutex::Autolock _l(mLock); 373 SensorRecord* rec = mActiveSensors.valueFor(handle); 374 if (rec) { 375 // see if this connection becomes inactive 376 connection->removeSensor(handle); 377 if (connection->hasAnySensor() == false) { 378 mActiveConnections.remove(connection); 379 } 380 // see if this sensor becomes inactive 381 if (rec->removeConnection(connection)) { 382 mActiveSensors.removeItem(handle); 383 mActiveVirtualSensors.removeItem(handle); 384 delete rec; 385 } 386 SensorInterface* sensor = mSensorMap.valueFor(handle); 387 err = sensor ? sensor->activate(connection.get(), false) : status_t(BAD_VALUE); 388 } 389 return err; 390} 391 392status_t SensorService::setEventRate(const sp<SensorEventConnection>& connection, 393 int handle, nsecs_t ns) 394{ 395 if (mInitCheck != NO_ERROR) 396 return mInitCheck; 397 398 if (ns < 0) 399 return BAD_VALUE; 400 401 if (ns < MINIMUM_EVENTS_PERIOD) 402 ns = MINIMUM_EVENTS_PERIOD; 403 404 SensorInterface* sensor = mSensorMap.valueFor(handle); 405 if (!sensor) return BAD_VALUE; 406 return sensor->setDelay(connection.get(), handle, ns); 407} 408 409// --------------------------------------------------------------------------- 410 411SensorService::SensorRecord::SensorRecord( 412 const sp<SensorEventConnection>& connection) 413{ 414 mConnections.add(connection); 415} 416 417bool SensorService::SensorRecord::addConnection( 418 const sp<SensorEventConnection>& connection) 419{ 420 if (mConnections.indexOf(connection) < 0) { 421 mConnections.add(connection); 422 return true; 423 } 424 return false; 425} 426 427bool SensorService::SensorRecord::removeConnection( 428 const wp<SensorEventConnection>& connection) 429{ 430 ssize_t index = mConnections.indexOf(connection); 431 if (index >= 0) { 432 mConnections.removeItemsAt(index, 1); 433 } 434 return mConnections.size() ? false : true; 435} 436 437// --------------------------------------------------------------------------- 438 439SensorService::SensorEventConnection::SensorEventConnection( 440 const sp<SensorService>& service) 441 : mService(service), mChannel(new SensorChannel()) 442{ 443} 444 445SensorService::SensorEventConnection::~SensorEventConnection() 446{ 447 mService->cleanupConnection(this); 448} 449 450void SensorService::SensorEventConnection::onFirstRef() 451{ 452} 453 454bool SensorService::SensorEventConnection::addSensor(int32_t handle) { 455 Mutex::Autolock _l(mConnectionLock); 456 if (mSensorInfo.indexOf(handle) <= 0) { 457 mSensorInfo.add(handle); 458 return true; 459 } 460 return false; 461} 462 463bool SensorService::SensorEventConnection::removeSensor(int32_t handle) { 464 Mutex::Autolock _l(mConnectionLock); 465 if (mSensorInfo.remove(handle) >= 0) { 466 return true; 467 } 468 return false; 469} 470 471bool SensorService::SensorEventConnection::hasSensor(int32_t handle) const { 472 Mutex::Autolock _l(mConnectionLock); 473 return mSensorInfo.indexOf(handle) >= 0; 474} 475 476bool SensorService::SensorEventConnection::hasAnySensor() const { 477 Mutex::Autolock _l(mConnectionLock); 478 return mSensorInfo.size() ? true : false; 479} 480 481status_t SensorService::SensorEventConnection::sendEvents( 482 sensors_event_t const* buffer, size_t numEvents, 483 sensors_event_t* scratch) 484{ 485 // filter out events not for this connection 486 size_t count = 0; 487 if (scratch) { 488 Mutex::Autolock _l(mConnectionLock); 489 size_t i=0; 490 while (i<numEvents) { 491 const int32_t curr = buffer[i].sensor; 492 if (mSensorInfo.indexOf(curr) >= 0) { 493 do { 494 scratch[count++] = buffer[i++]; 495 } while ((i<numEvents) && (buffer[i].sensor == curr)); 496 } else { 497 i++; 498 } 499 } 500 } else { 501 scratch = const_cast<sensors_event_t *>(buffer); 502 count = numEvents; 503 } 504 505 if (count == 0) 506 return 0; 507 508 ssize_t size = mChannel->write(scratch, count*sizeof(sensors_event_t)); 509 if (size == -EAGAIN) { 510 // the destination doesn't accept events anymore, it's probably 511 // full. For now, we just drop the events on the floor. 512 LOGW("dropping %d events on the floor", count); 513 return size; 514 } 515 516 LOGE_IF(size<0, "dropping %d events on the floor (%s)", 517 count, strerror(-size)); 518 519 return size < 0 ? status_t(size) : status_t(NO_ERROR); 520} 521 522sp<SensorChannel> SensorService::SensorEventConnection::getSensorChannel() const 523{ 524 return mChannel; 525} 526 527status_t SensorService::SensorEventConnection::enableDisable( 528 int handle, bool enabled) 529{ 530 status_t err; 531 if (enabled) { 532 err = mService->enable(this, handle); 533 } else { 534 err = mService->disable(this, handle); 535 } 536 return err; 537} 538 539status_t SensorService::SensorEventConnection::setEventRate( 540 int handle, nsecs_t ns) 541{ 542 return mService->setEventRate(this, handle, ns); 543} 544 545// --------------------------------------------------------------------------- 546}; // namespace android 547 548