SensorService.cpp revision 4342fdf14ffb792a36c1de25ad14b745df628da2
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 <cutils/properties.h> 22 23#include <utils/SortedVector.h> 24#include <utils/KeyedVector.h> 25#include <utils/threads.h> 26#include <utils/Atomic.h> 27#include <utils/Errors.h> 28#include <utils/RefBase.h> 29#include <utils/Singleton.h> 30#include <utils/String16.h> 31 32#include <binder/BinderService.h> 33#include <binder/IServiceManager.h> 34#include <binder/PermissionCache.h> 35 36#include <gui/ISensorServer.h> 37#include <gui/ISensorEventConnection.h> 38#include <gui/SensorEventQueue.h> 39 40#include <hardware/sensors.h> 41#include <hardware_legacy/power.h> 42 43#include "BatteryService.h" 44#include "CorrectedGyroSensor.h" 45#include "GravitySensor.h" 46#include "LinearAccelerationSensor.h" 47#include "OrientationSensor.h" 48#include "RotationVectorSensor.h" 49#include "SensorFusion.h" 50#include "SensorService.h" 51 52namespace android { 53// --------------------------------------------------------------------------- 54 55/* 56 * Notes: 57 * 58 * - what about a gyro-corrected magnetic-field sensor? 59 * - run mag sensor from time to time to force calibration 60 * - gravity sensor length is wrong (=> drift in linear-acc sensor) 61 * 62 */ 63 64const char* SensorService::WAKE_LOCK_NAME = "SensorService"; 65 66SensorService::SensorService() 67 : mInitCheck(NO_INIT) 68{ 69} 70 71void SensorService::onFirstRef() 72{ 73 ALOGD("nuSensorService starting..."); 74 75 SensorDevice& dev(SensorDevice::getInstance()); 76 77 if (dev.initCheck() == NO_ERROR) { 78 sensor_t const* list; 79 ssize_t count = dev.getSensorList(&list); 80 if (count > 0) { 81 ssize_t orientationIndex = -1; 82 bool hasGyro = false; 83 uint32_t virtualSensorsNeeds = 84 (1<<SENSOR_TYPE_GRAVITY) | 85 (1<<SENSOR_TYPE_LINEAR_ACCELERATION) | 86 (1<<SENSOR_TYPE_ROTATION_VECTOR); 87 88 mLastEventSeen.setCapacity(count); 89 for (ssize_t i=0 ; i<count ; i++) { 90 registerSensor( new HardwareSensor(list[i]) ); 91 switch (list[i].type) { 92 case SENSOR_TYPE_ORIENTATION: 93 orientationIndex = i; 94 break; 95 case SENSOR_TYPE_GYROSCOPE: 96 hasGyro = true; 97 break; 98 case SENSOR_TYPE_GRAVITY: 99 case SENSOR_TYPE_LINEAR_ACCELERATION: 100 case SENSOR_TYPE_ROTATION_VECTOR: 101 virtualSensorsNeeds &= ~(1<<list[i].type); 102 break; 103 } 104 } 105 106 // it's safe to instantiate the SensorFusion object here 107 // (it wants to be instantiated after h/w sensors have been 108 // registered) 109 const SensorFusion& fusion(SensorFusion::getInstance()); 110 111 if (hasGyro) { 112 // Always instantiate Android's virtual sensors. Since they are 113 // instantiated behind sensors from the HAL, they won't 114 // interfere with applications, unless they looks specifically 115 // for them (by name). 116 117 registerVirtualSensor( new RotationVectorSensor() ); 118 registerVirtualSensor( new GravitySensor(list, count) ); 119 registerVirtualSensor( new LinearAccelerationSensor(list, count) ); 120 121 // these are optional 122 registerVirtualSensor( new OrientationSensor() ); 123 registerVirtualSensor( new CorrectedGyroSensor(list, count) ); 124 } 125 126 // build the sensor list returned to users 127 mUserSensorList = mSensorList; 128 129 if (hasGyro) { 130 // virtual debugging sensors are not added to mUserSensorList 131 registerVirtualSensor( new GyroDriftSensor() ); 132 } 133 134 if (hasGyro && 135 (virtualSensorsNeeds & (1<<SENSOR_TYPE_ROTATION_VECTOR))) { 136 // if we have the fancy sensor fusion, and it's not provided by the 137 // HAL, use our own (fused) orientation sensor by removing the 138 // HAL supplied one form the user list. 139 if (orientationIndex >= 0) { 140 mUserSensorList.removeItemsAt(orientationIndex); 141 } 142 } 143 144 // debugging sensor list 145 for (size_t i=0 ; i<mSensorList.size() ; i++) { 146 switch (mSensorList[i].getType()) { 147 case SENSOR_TYPE_GRAVITY: 148 case SENSOR_TYPE_LINEAR_ACCELERATION: 149 case SENSOR_TYPE_ROTATION_VECTOR: 150 if (strstr(mSensorList[i].getVendor().string(), "Google")) { 151 mUserSensorListDebug.add(mSensorList[i]); 152 } 153 break; 154 default: 155 mUserSensorListDebug.add(mSensorList[i]); 156 break; 157 } 158 } 159 160 run("SensorService", PRIORITY_URGENT_DISPLAY); 161 mInitCheck = NO_ERROR; 162 } 163 } 164} 165 166void SensorService::registerSensor(SensorInterface* s) 167{ 168 sensors_event_t event; 169 memset(&event, 0, sizeof(event)); 170 171 const Sensor sensor(s->getSensor()); 172 // add to the sensor list (returned to clients) 173 mSensorList.add(sensor); 174 // add to our handle->SensorInterface mapping 175 mSensorMap.add(sensor.getHandle(), s); 176 // create an entry in the mLastEventSeen array 177 mLastEventSeen.add(sensor.getHandle(), event); 178} 179 180void SensorService::registerVirtualSensor(SensorInterface* s) 181{ 182 registerSensor(s); 183 mVirtualSensorList.add( s ); 184} 185 186SensorService::~SensorService() 187{ 188 for (size_t i=0 ; i<mSensorMap.size() ; i++) 189 delete mSensorMap.valueAt(i); 190} 191 192static const String16 sDump("android.permission.DUMP"); 193 194status_t SensorService::dump(int fd, const Vector<String16>& args) 195{ 196 const size_t SIZE = 1024; 197 char buffer[SIZE]; 198 String8 result; 199 if (!PermissionCache::checkCallingPermission(sDump)) { 200 snprintf(buffer, SIZE, "Permission Denial: " 201 "can't dump SurfaceFlinger from pid=%d, uid=%d\n", 202 IPCThreadState::self()->getCallingPid(), 203 IPCThreadState::self()->getCallingUid()); 204 result.append(buffer); 205 } else { 206 Mutex::Autolock _l(mLock); 207 snprintf(buffer, SIZE, "Sensor List:\n"); 208 result.append(buffer); 209 for (size_t i=0 ; i<mSensorList.size() ; i++) { 210 const Sensor& s(mSensorList[i]); 211 const sensors_event_t& e(mLastEventSeen.valueFor(s.getHandle())); 212 snprintf(buffer, SIZE, 213 "%-48s| %-32s | 0x%08x | maxRate=%7.2fHz | " 214 "last=<%5.1f,%5.1f,%5.1f>\n", 215 s.getName().string(), 216 s.getVendor().string(), 217 s.getHandle(), 218 s.getMinDelay() ? (1000000.0f / s.getMinDelay()) : 0.0f, 219 e.data[0], e.data[1], e.data[2]); 220 result.append(buffer); 221 } 222 SensorFusion::getInstance().dump(result, buffer, SIZE); 223 SensorDevice::getInstance().dump(result, buffer, SIZE); 224 225 snprintf(buffer, SIZE, "%d active connections\n", 226 mActiveConnections.size()); 227 result.append(buffer); 228 snprintf(buffer, SIZE, "Active sensors:\n"); 229 result.append(buffer); 230 for (size_t i=0 ; i<mActiveSensors.size() ; i++) { 231 int handle = mActiveSensors.keyAt(i); 232 snprintf(buffer, SIZE, "%s (handle=0x%08x, connections=%d)\n", 233 getSensorName(handle).string(), 234 handle, 235 mActiveSensors.valueAt(i)->getNumConnections()); 236 result.append(buffer); 237 } 238 } 239 write(fd, result.string(), result.size()); 240 return NO_ERROR; 241} 242 243void SensorService::cleanupAutoDisabledSensor(const sp<SensorEventConnection>& connection, 244 sensors_event_t const* buffer, const int count) { 245 for (int i=0 ; i<count ; i++) { 246 int handle = buffer[i].sensor; 247 if (getSensorType(handle) == SENSOR_TYPE_SIGNIFICANT_MOTION) { 248 if (connection->hasSensor(handle)) { 249 cleanupWithoutDisable(connection, handle); 250 } 251 } 252 } 253} 254 255bool SensorService::threadLoop() 256{ 257 ALOGD("nuSensorService thread starting..."); 258 259 const size_t numEventMax = 16; 260 const size_t minBufferSize = numEventMax + numEventMax * mVirtualSensorList.size(); 261 sensors_event_t buffer[minBufferSize]; 262 sensors_event_t scratch[minBufferSize]; 263 SensorDevice& device(SensorDevice::getInstance()); 264 const size_t vcount = mVirtualSensorList.size(); 265 266 ssize_t count; 267 bool wakeLockAcquired = false; 268 const int halVersion = device.getHalDeviceVersion(); 269 do { 270 count = device.poll(buffer, numEventMax); 271 if (count<0) { 272 ALOGE("sensor poll failed (%s)", strerror(-count)); 273 break; 274 } 275 276 // Poll has returned. Hold a wakelock. 277 // Todo(): add a flag to the sensors definitions to indicate 278 // the sensors which can wake up the AP 279 for (int i = 0; i < count; i++) { 280 if (getSensorType(buffer[i].sensor) == SENSOR_TYPE_SIGNIFICANT_MOTION) { 281 acquire_wake_lock(PARTIAL_WAKE_LOCK, WAKE_LOCK_NAME); 282 wakeLockAcquired = true; 283 break; 284 } 285 } 286 287 recordLastValue(buffer, count); 288 289 // handle virtual sensors 290 if (count && vcount) { 291 sensors_event_t const * const event = buffer; 292 const DefaultKeyedVector<int, SensorInterface*> virtualSensors( 293 getActiveVirtualSensors()); 294 const size_t activeVirtualSensorCount = virtualSensors.size(); 295 if (activeVirtualSensorCount) { 296 size_t k = 0; 297 SensorFusion& fusion(SensorFusion::getInstance()); 298 if (fusion.isEnabled()) { 299 for (size_t i=0 ; i<size_t(count) ; i++) { 300 fusion.process(event[i]); 301 } 302 } 303 for (size_t i=0 ; i<size_t(count) && k<minBufferSize ; i++) { 304 for (size_t j=0 ; j<activeVirtualSensorCount ; j++) { 305 if (count + k >= minBufferSize) { 306 ALOGE("buffer too small to hold all events: " 307 "count=%u, k=%u, size=%u", 308 count, k, minBufferSize); 309 break; 310 } 311 sensors_event_t out; 312 SensorInterface* si = virtualSensors.valueAt(j); 313 if (si->process(&out, event[i])) { 314 buffer[count + k] = out; 315 k++; 316 } 317 } 318 } 319 if (k) { 320 // record the last synthesized values 321 recordLastValue(&buffer[count], k); 322 count += k; 323 // sort the buffer by time-stamps 324 sortEventBuffer(buffer, count); 325 } 326 } 327 } 328 329 // handle backward compatibility for RotationVector sensor 330 if (halVersion < SENSORS_DEVICE_API_VERSION_1_0) { 331 for (int i = 0; i < count; i++) { 332 if (getSensorType(buffer[i].sensor) == SENSOR_TYPE_ROTATION_VECTOR) { 333 // All the 4 components of the quaternion should be available 334 // No heading accuracy. Set it to -1 335 buffer[i].data[4] = -1; 336 } 337 } 338 } 339 340 // send our events to clients... 341 const SortedVector< wp<SensorEventConnection> > activeConnections( 342 getActiveConnections()); 343 size_t numConnections = activeConnections.size(); 344 for (size_t i=0 ; i<numConnections ; i++) { 345 sp<SensorEventConnection> connection( 346 activeConnections[i].promote()); 347 if (connection != 0) { 348 connection->sendEvents(buffer, count, scratch); 349 // Some sensors need to be auto disabled after the trigger 350 cleanupAutoDisabledSensor(connection, buffer, count); 351 } 352 } 353 354 // We have read the data, upper layers should hold the wakelock. 355 if (wakeLockAcquired) release_wake_lock(WAKE_LOCK_NAME); 356 357 } while (count >= 0 || Thread::exitPending()); 358 359 ALOGW("Exiting SensorService::threadLoop => aborting..."); 360 abort(); 361 return false; 362} 363 364void SensorService::recordLastValue( 365 sensors_event_t const * buffer, size_t count) 366{ 367 Mutex::Autolock _l(mLock); 368 369 // record the last event for each sensor 370 int32_t prev = buffer[0].sensor; 371 for (size_t i=1 ; i<count ; i++) { 372 // record the last event of each sensor type in this buffer 373 int32_t curr = buffer[i].sensor; 374 if (curr != prev) { 375 mLastEventSeen.editValueFor(prev) = buffer[i-1]; 376 prev = curr; 377 } 378 } 379 mLastEventSeen.editValueFor(prev) = buffer[count-1]; 380} 381 382void SensorService::sortEventBuffer(sensors_event_t* buffer, size_t count) 383{ 384 struct compar { 385 static int cmp(void const* lhs, void const* rhs) { 386 sensors_event_t const* l = static_cast<sensors_event_t const*>(lhs); 387 sensors_event_t const* r = static_cast<sensors_event_t const*>(rhs); 388 return l->timestamp - r->timestamp; 389 } 390 }; 391 qsort(buffer, count, sizeof(sensors_event_t), compar::cmp); 392} 393 394SortedVector< wp<SensorService::SensorEventConnection> > 395SensorService::getActiveConnections() const 396{ 397 Mutex::Autolock _l(mLock); 398 return mActiveConnections; 399} 400 401DefaultKeyedVector<int, SensorInterface*> 402SensorService::getActiveVirtualSensors() const 403{ 404 Mutex::Autolock _l(mLock); 405 return mActiveVirtualSensors; 406} 407 408String8 SensorService::getSensorName(int handle) const { 409 size_t count = mUserSensorList.size(); 410 for (size_t i=0 ; i<count ; i++) { 411 const Sensor& sensor(mUserSensorList[i]); 412 if (sensor.getHandle() == handle) { 413 return sensor.getName(); 414 } 415 } 416 String8 result("unknown"); 417 return result; 418} 419 420int SensorService::getSensorType(int handle) const { 421 size_t count = mUserSensorList.size(); 422 for (size_t i=0 ; i<count ; i++) { 423 const Sensor& sensor(mUserSensorList[i]); 424 if (sensor.getHandle() == handle) { 425 return sensor.getType(); 426 } 427 } 428 return -1; 429} 430 431 432Vector<Sensor> SensorService::getSensorList() 433{ 434 char value[PROPERTY_VALUE_MAX]; 435 property_get("debug.sensors", value, "0"); 436 if (atoi(value)) { 437 return mUserSensorListDebug; 438 } 439 return mUserSensorList; 440} 441 442sp<ISensorEventConnection> SensorService::createSensorEventConnection() 443{ 444 uid_t uid = IPCThreadState::self()->getCallingUid(); 445 sp<SensorEventConnection> result(new SensorEventConnection(this, uid)); 446 return result; 447} 448 449void SensorService::cleanupConnection(SensorEventConnection* c) 450{ 451 Mutex::Autolock _l(mLock); 452 const wp<SensorEventConnection> connection(c); 453 size_t size = mActiveSensors.size(); 454 ALOGD_IF(DEBUG_CONNECTIONS, "%d active sensors", size); 455 for (size_t i=0 ; i<size ; ) { 456 int handle = mActiveSensors.keyAt(i); 457 if (c->hasSensor(handle)) { 458 ALOGD_IF(DEBUG_CONNECTIONS, "%i: disabling handle=0x%08x", i, handle); 459 SensorInterface* sensor = mSensorMap.valueFor( handle ); 460 ALOGE_IF(!sensor, "mSensorMap[handle=0x%08x] is null!", handle); 461 if (sensor) { 462 sensor->activate(c, false); 463 } 464 } 465 SensorRecord* rec = mActiveSensors.valueAt(i); 466 ALOGE_IF(!rec, "mActiveSensors[%d] is null (handle=0x%08x)!", i, handle); 467 ALOGD_IF(DEBUG_CONNECTIONS, 468 "removing connection %p for sensor[%d].handle=0x%08x", 469 c, i, handle); 470 471 if (rec && rec->removeConnection(connection)) { 472 ALOGD_IF(DEBUG_CONNECTIONS, "... and it was the last connection"); 473 mActiveSensors.removeItemsAt(i, 1); 474 mActiveVirtualSensors.removeItem(handle); 475 delete rec; 476 size--; 477 } else { 478 i++; 479 } 480 } 481 mActiveConnections.remove(connection); 482 BatteryService::cleanup(c->getUid()); 483} 484 485status_t SensorService::enable(const sp<SensorEventConnection>& connection, 486 int handle) 487{ 488 if (mInitCheck != NO_ERROR) 489 return mInitCheck; 490 491 Mutex::Autolock _l(mLock); 492 SensorInterface* sensor = mSensorMap.valueFor(handle); 493 SensorRecord* rec = mActiveSensors.valueFor(handle); 494 if (rec == 0) { 495 rec = new SensorRecord(connection); 496 mActiveSensors.add(handle, rec); 497 if (sensor->isVirtual()) { 498 mActiveVirtualSensors.add(handle, sensor); 499 } 500 } else { 501 if (rec->addConnection(connection)) { 502 // this sensor is already activated, but we are adding a 503 // connection that uses it. Immediately send down the last 504 // known value of the requested sensor if it's not a 505 // "continuous" sensor. 506 if (sensor->getSensor().getMinDelay() == 0) { 507 sensors_event_t scratch; 508 sensors_event_t& event(mLastEventSeen.editValueFor(handle)); 509 if (event.version == sizeof(sensors_event_t)) { 510 connection->sendEvents(&event, 1); 511 } 512 } 513 } 514 } 515 516 if (connection->addSensor(handle)) { 517 BatteryService::enableSensor(connection->getUid(), handle); 518 // the sensor was added (which means it wasn't already there) 519 // so, see if this connection becomes active 520 if (mActiveConnections.indexOf(connection) < 0) { 521 mActiveConnections.add(connection); 522 } 523 } else { 524 ALOGW("sensor %08x already enabled in connection %p (ignoring)", 525 handle, connection.get()); 526 } 527 528 529 // we are setup, now enable the sensor. 530 status_t err = sensor ? sensor->activate(connection.get(), true) : status_t(BAD_VALUE); 531 532 if (err != NO_ERROR) { 533 // enable has failed, reset our state. 534 cleanupWithoutDisable(connection, handle); 535 } 536 return err; 537} 538 539status_t SensorService::disable(const sp<SensorEventConnection>& connection, 540 int handle) 541{ 542 if (mInitCheck != NO_ERROR) 543 return mInitCheck; 544 545 status_t err = cleanupWithoutDisable(connection, handle); 546 if (err == NO_ERROR) { 547 SensorInterface* sensor = mSensorMap.valueFor(handle); 548 err = sensor ? sensor->activate(connection.get(), false) : status_t(BAD_VALUE); 549 } 550 return err; 551} 552 553status_t SensorService::cleanupWithoutDisable(const sp<SensorEventConnection>& connection, 554 int handle) { 555 Mutex::Autolock _l(mLock); 556 SensorRecord* rec = mActiveSensors.valueFor(handle); 557 if (rec) { 558 // see if this connection becomes inactive 559 if (connection->removeSensor(handle)) { 560 BatteryService::disableSensor(connection->getUid(), handle); 561 } 562 if (connection->hasAnySensor() == false) { 563 mActiveConnections.remove(connection); 564 } 565 // see if this sensor becomes inactive 566 if (rec->removeConnection(connection)) { 567 mActiveSensors.removeItem(handle); 568 mActiveVirtualSensors.removeItem(handle); 569 delete rec; 570 } 571 return NO_ERROR; 572 } 573 return BAD_VALUE; 574} 575 576status_t SensorService::setEventRate(const sp<SensorEventConnection>& connection, 577 int handle, nsecs_t ns) 578{ 579 if (mInitCheck != NO_ERROR) 580 return mInitCheck; 581 582 SensorInterface* sensor = mSensorMap.valueFor(handle); 583 if (!sensor) 584 return BAD_VALUE; 585 586 if (ns < 0) 587 return BAD_VALUE; 588 589 nsecs_t minDelayNs = sensor->getSensor().getMinDelayNs(); 590 if (ns < minDelayNs) { 591 ns = minDelayNs; 592 } 593 594 if (ns < MINIMUM_EVENTS_PERIOD) 595 ns = MINIMUM_EVENTS_PERIOD; 596 597 return sensor->setDelay(connection.get(), handle, ns); 598} 599 600// --------------------------------------------------------------------------- 601 602SensorService::SensorRecord::SensorRecord( 603 const sp<SensorEventConnection>& connection) 604{ 605 mConnections.add(connection); 606} 607 608bool SensorService::SensorRecord::addConnection( 609 const sp<SensorEventConnection>& connection) 610{ 611 if (mConnections.indexOf(connection) < 0) { 612 mConnections.add(connection); 613 return true; 614 } 615 return false; 616} 617 618bool SensorService::SensorRecord::removeConnection( 619 const wp<SensorEventConnection>& connection) 620{ 621 ssize_t index = mConnections.indexOf(connection); 622 if (index >= 0) { 623 mConnections.removeItemsAt(index, 1); 624 } 625 return mConnections.size() ? false : true; 626} 627 628// --------------------------------------------------------------------------- 629 630SensorService::SensorEventConnection::SensorEventConnection( 631 const sp<SensorService>& service, uid_t uid) 632 : mService(service), mChannel(new BitTube()), mUid(uid) 633{ 634} 635 636SensorService::SensorEventConnection::~SensorEventConnection() 637{ 638 ALOGD_IF(DEBUG_CONNECTIONS, "~SensorEventConnection(%p)", this); 639 mService->cleanupConnection(this); 640} 641 642void SensorService::SensorEventConnection::onFirstRef() 643{ 644} 645 646bool SensorService::SensorEventConnection::addSensor(int32_t handle) { 647 Mutex::Autolock _l(mConnectionLock); 648 if (mSensorInfo.indexOf(handle) < 0) { 649 mSensorInfo.add(handle); 650 return true; 651 } 652 return false; 653} 654 655bool SensorService::SensorEventConnection::removeSensor(int32_t handle) { 656 Mutex::Autolock _l(mConnectionLock); 657 if (mSensorInfo.remove(handle) >= 0) { 658 return true; 659 } 660 return false; 661} 662 663bool SensorService::SensorEventConnection::hasSensor(int32_t handle) const { 664 Mutex::Autolock _l(mConnectionLock); 665 return mSensorInfo.indexOf(handle) >= 0; 666} 667 668bool SensorService::SensorEventConnection::hasAnySensor() const { 669 Mutex::Autolock _l(mConnectionLock); 670 return mSensorInfo.size() ? true : false; 671} 672 673status_t SensorService::SensorEventConnection::sendEvents( 674 sensors_event_t const* buffer, size_t numEvents, 675 sensors_event_t* scratch) 676{ 677 // filter out events not for this connection 678 size_t count = 0; 679 if (scratch) { 680 Mutex::Autolock _l(mConnectionLock); 681 size_t i=0; 682 while (i<numEvents) { 683 const int32_t curr = buffer[i].sensor; 684 if (mSensorInfo.indexOf(curr) >= 0) { 685 do { 686 scratch[count++] = buffer[i++]; 687 } while ((i<numEvents) && (buffer[i].sensor == curr)); 688 } else { 689 i++; 690 } 691 } 692 } else { 693 scratch = const_cast<sensors_event_t *>(buffer); 694 count = numEvents; 695 } 696 697 // NOTE: ASensorEvent and sensors_event_t are the same type 698 ssize_t size = SensorEventQueue::write(mChannel, 699 reinterpret_cast<ASensorEvent const*>(scratch), count); 700 if (size == -EAGAIN) { 701 // the destination doesn't accept events anymore, it's probably 702 // full. For now, we just drop the events on the floor. 703 //ALOGW("dropping %d events on the floor", count); 704 return size; 705 } 706 707 return size < 0 ? status_t(size) : status_t(NO_ERROR); 708} 709 710sp<BitTube> SensorService::SensorEventConnection::getSensorChannel() const 711{ 712 return mChannel; 713} 714 715status_t SensorService::SensorEventConnection::enableDisable( 716 int handle, bool enabled) 717{ 718 status_t err; 719 if (enabled) { 720 err = mService->enable(this, handle); 721 } else { 722 err = mService->disable(this, handle); 723 } 724 return err; 725} 726 727status_t SensorService::SensorEventConnection::setEventRate( 728 int handle, nsecs_t ns) 729{ 730 return mService->setEventRate(this, handle, ns); 731} 732 733// --------------------------------------------------------------------------- 734}; // namespace android 735 736