services/sensorservice/SensorDirectConnection.cpp - platform/frameworks/native - Git at Google

 /*
  * Copyright (C) 2016 The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *      http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */

 #include "SensorDevice.h"
 #include "SensorDirectConnection.h"
 #include <android/util/ProtoOutputStream.h>
 #include <frameworks/base/core/proto/android/service/sensor_service.proto.h>
 #include <hardware/sensors.h>

 #define UNUSED(x) (void)(x)

 namespace android {

 using util::ProtoOutputStream;

 SensorService::SensorDirectConnection::SensorDirectConnection(const sp<SensorService>& service,
         uid_t uid, const sensors_direct_mem_t *mem, int32_t halChannelHandle,
         const String16& opPackageName)
         : mService(service), mUid(uid), mMem(*mem),
         mHalChannelHandle(halChannelHandle),
         mOpPackageName(opPackageName), mDestroyed(false) {
     mIsRateCappedBasedOnPermission = mService->isRateCappedBasedOnPermission(mOpPackageName);
     mUserId = multiuser_get_user_id(mUid);
     ALOGD_IF(DEBUG_CONNECTIONS, "Created SensorDirectConnection");
 }

 SensorService::SensorDirectConnection::~SensorDirectConnection() {
     ALOGD_IF(DEBUG_CONNECTIONS, "~SensorDirectConnection %p", this);
     destroy();
 }

 void SensorService::SensorDirectConnection::destroy() {
     Mutex::Autolock _l(mDestroyLock);
     // destroy once only
     if (mDestroyed) {
         return;
     }

     stopAll();
     mService->cleanupConnection(this);
     if (mMem.handle != nullptr) {
         native_handle_close(mMem.handle);
         native_handle_delete(const_cast<struct native_handle*>(mMem.handle));
     }
     mDestroyed = true;
 }

 void SensorService::SensorDirectConnection::onFirstRef() {
 }

 void SensorService::SensorDirectConnection::dump(String8& result) const {
     Mutex::Autolock _l(mConnectionLock);
     result.appendFormat("\tPackage %s, HAL channel handle %d, total sensor activated %zu\n",
             String8(mOpPackageName).string(), getHalChannelHandle(), mActivated.size());
     for (auto &i : mActivated) {
         result.appendFormat("\t\tSensor %#08x, rate %d\n", i.first, i.second);
     }
 }

 /**
  * Dump debugging information as android.service.SensorDirectConnectionProto protobuf message using
  * ProtoOutputStream.
  *
  * See proto definition and some notes about ProtoOutputStream in
  * frameworks/base/core/proto/android/service/sensor_service.proto
  */
 void SensorService::SensorDirectConnection::dump(ProtoOutputStream* proto) const {
     using namespace service::SensorDirectConnectionProto;
     Mutex::Autolock _l(mConnectionLock);
     proto->write(PACKAGE_NAME, std::string(String8(mOpPackageName).string()));
     proto->write(HAL_CHANNEL_HANDLE, getHalChannelHandle());
     proto->write(NUM_SENSOR_ACTIVATED, int(mActivated.size()));
     for (auto &i : mActivated) {
         uint64_t token = proto->start(SENSORS);
         proto->write(SensorProto::SENSOR, i.first);
         proto->write(SensorProto::RATE, i.second);
         proto->end(token);
     }
 }

 sp<BitTube> SensorService::SensorDirectConnection::getSensorChannel() const {
     return nullptr;
 }

 void SensorService::SensorDirectConnection::onSensorAccessChanged(bool hasAccess) {
     if (!hasAccess) {
         stopAll(true /* backupRecord */);
     } else {
         recoverAll();
     }
 }

 void SensorService::SensorDirectConnection::onMicSensorAccessChanged(bool isMicToggleOn) {
     if (isMicToggleOn) {
         capRates();
     } else {
         uncapRates();
     }
 }

 bool SensorService::SensorDirectConnection::hasSensorAccess() const {
     return mService->hasSensorAccess(mUid, mOpPackageName);
 }

 status_t SensorService::SensorDirectConnection::enableDisable(
         int handle, bool enabled, nsecs_t samplingPeriodNs, nsecs_t maxBatchReportLatencyNs,
         int reservedFlags) {
     // SensorDirectConnection does not support enableDisable, parameters not used
     UNUSED(handle);
     UNUSED(enabled);
     UNUSED(samplingPeriodNs);
     UNUSED(maxBatchReportLatencyNs);
     UNUSED(reservedFlags);
     return INVALID_OPERATION;
 }

 status_t SensorService::SensorDirectConnection::setEventRate(
         int handle, nsecs_t samplingPeriodNs) {
     // SensorDirectConnection does not support setEventRate, parameters not used
     UNUSED(handle);
     UNUSED(samplingPeriodNs);
     return INVALID_OPERATION;
 }

 status_t SensorService::SensorDirectConnection::flush() {
     // SensorDirectConnection does not support flush
     return INVALID_OPERATION;
 }

 int32_t SensorService::SensorDirectConnection::configureChannel(int handle, int rateLevel) {

     if (handle == -1 && rateLevel == SENSOR_DIRECT_RATE_STOP) {
         stopAll();
         mMicRateBackup.clear();
         return NO_ERROR;
     }

     if (!hasSensorAccess()) {
         return PERMISSION_DENIED;
     }

     sp<SensorInterface> si = mService->getSensorInterfaceFromHandle(handle);
     if (si == nullptr) {
         return NAME_NOT_FOUND;
     }

     const Sensor& s = si->getSensor();
     if (!SensorService::canAccessSensor(s, "config direct channel", mOpPackageName)) {
         return PERMISSION_DENIED;
     }

     if (s.getHighestDirectReportRateLevel() == 0
             || rateLevel > s.getHighestDirectReportRateLevel()
             || !s.isDirectChannelTypeSupported(mMem.type)) {
         return INVALID_OPERATION;
     }

     int requestedRateLevel = rateLevel;
     if (mService->isSensorInCappedSet(s.getType()) && rateLevel != SENSOR_DIRECT_RATE_STOP) {
         status_t err = mService->adjustRateLevelBasedOnMicAndPermission(&rateLevel, mOpPackageName);
         if (err != OK) {
             return err;
         }
     }

     struct sensors_direct_cfg_t config = {
         .rate_level = rateLevel
     };

     Mutex::Autolock _l(mConnectionLock);
     SensorDevice& dev(SensorDevice::getInstance());
     int ret = dev.configureDirectChannel(handle, getHalChannelHandle(), &config);

     if (rateLevel == SENSOR_DIRECT_RATE_STOP) {
         if (ret == NO_ERROR) {
             mActivated.erase(handle);
             mMicRateBackup.erase(handle);
         } else if (ret > 0) {
             ret = UNKNOWN_ERROR;
         }
     } else {
         if (ret > 0) {
             mActivated[handle] = rateLevel;
             if (mService->isSensorInCappedSet(s.getType())) {
                 // Back up the rates that the app is allowed to have if the mic toggle is off
                 // This is used in the uncapRates() function.
                 if (!mIsRateCappedBasedOnPermission ||
                             requestedRateLevel <= SENSOR_SERVICE_CAPPED_SAMPLING_RATE_LEVEL) {
                     mMicRateBackup[handle] = requestedRateLevel;
                 } else {
                     mMicRateBackup[handle] = SENSOR_SERVICE_CAPPED_SAMPLING_RATE_LEVEL;
                 }
             }
         }
     }

     return ret;
 }

 void SensorService::SensorDirectConnection::capRates() {
     Mutex::Autolock _l(mConnectionLock);
     const struct sensors_direct_cfg_t capConfig = {
         .rate_level = SENSOR_SERVICE_CAPPED_SAMPLING_RATE_LEVEL
     };

     const struct sensors_direct_cfg_t stopConfig = {
         .rate_level = SENSOR_DIRECT_RATE_STOP
     };

     // If our requests are in the backup, then we shouldn't activate sensors from here
     bool temporarilyStopped = mActivated.empty() && !mActivatedBackup.empty();
     std::unordered_map<int, int>& existingConnections =
                     (!temporarilyStopped) ? mActivated : mActivatedBackup;

     SensorDevice& dev(SensorDevice::getInstance());
     for (auto &i : existingConnections) {
         int handle = i.first;
         int rateLevel = i.second;
         sp<SensorInterface> si = mService->getSensorInterfaceFromHandle(handle);
         if (si != nullptr) {
             const Sensor& s = si->getSensor();
             if (mService->isSensorInCappedSet(s.getType()) &&
                         rateLevel > SENSOR_SERVICE_CAPPED_SAMPLING_RATE_LEVEL) {
                 mMicRateBackup[handle] = rateLevel;
                 // Modify the rate kept by the existing map
                 existingConnections[handle] = SENSOR_SERVICE_CAPPED_SAMPLING_RATE_LEVEL;
                 // Only reconfigure the channel if it's ongoing
                 if (!temporarilyStopped) {
                     // Stopping before reconfiguring is the well-tested path in CTS
                     dev.configureDirectChannel(handle, getHalChannelHandle(), &stopConfig);
                     dev.configureDirectChannel(handle, getHalChannelHandle(), &capConfig);
                 }
             }
         }
     }
 }

 void SensorService::SensorDirectConnection::uncapRates() {
     Mutex::Autolock _l(mConnectionLock);

     // If our requests are in the backup, then we shouldn't activate sensors from here
     bool temporarilyStopped = mActivated.empty() && !mActivatedBackup.empty();
     std::unordered_map<int, int>& existingConnections =
                     (!temporarilyStopped) ? mActivated : mActivatedBackup;

     const struct sensors_direct_cfg_t stopConfig = {
         .rate_level = SENSOR_DIRECT_RATE_STOP
     };
     SensorDevice& dev(SensorDevice::getInstance());
     for (auto &i : mMicRateBackup) {
         int handle = i.first;
         int rateLevel = i.second;

         const struct sensors_direct_cfg_t config = {
             .rate_level = rateLevel
         };

         // Modify the rate kept by the existing map
         existingConnections[handle] = rateLevel;

         // Only reconfigure the channel if it's ongoing
         if (!temporarilyStopped) {
             // Stopping before reconfiguring is the well-tested path in CTS
             dev.configureDirectChannel(handle, getHalChannelHandle(), &stopConfig);
             dev.configureDirectChannel(handle, getHalChannelHandle(), &config);
         }
     }
     mMicRateBackup.clear();
 }

 void SensorService::SensorDirectConnection::stopAll(bool backupRecord) {
     Mutex::Autolock _l(mConnectionLock);
     stopAllLocked(backupRecord);
 }

 void SensorService::SensorDirectConnection::stopAllLocked(bool backupRecord) {
     struct sensors_direct_cfg_t config = {
         .rate_level = SENSOR_DIRECT_RATE_STOP
     };

     SensorDevice& dev(SensorDevice::getInstance());
     for (auto &i : mActivated) {
         dev.configureDirectChannel(i.first, getHalChannelHandle(), &config);
     }

     if (backupRecord && mActivatedBackup.empty()) {
         mActivatedBackup = mActivated;
     }
     mActivated.clear();
 }

 void SensorService::SensorDirectConnection::recoverAll() {
     Mutex::Autolock _l(mConnectionLock);
     if (!mActivatedBackup.empty()) {
         stopAllLocked(false);

         SensorDevice& dev(SensorDevice::getInstance());

         // recover list of report from backup
         ALOG_ASSERT(mActivated.empty(),
                     "mActivated must be empty if mActivatedBackup was non-empty");
         mActivated = mActivatedBackup;
         mActivatedBackup.clear();

         // re-enable them
         for (auto &i : mActivated) {
             struct sensors_direct_cfg_t config = {
                 .rate_level = i.second
             };
             dev.configureDirectChannel(i.first, getHalChannelHandle(), &config);
         }
     }
 }

 int32_t SensorService::SensorDirectConnection::getHalChannelHandle() const {
     return mHalChannelHandle;
 }

 bool SensorService::SensorDirectConnection::isEquivalent(const sensors_direct_mem_t *mem) const {
     bool ret = false;

     if (mMem.type == mem->type) {
         switch (mMem.type) {
             case SENSOR_DIRECT_MEM_TYPE_ASHMEM: {
                 // there is no known method to test if two ashmem fds are equivalent besides
                 // trivially comparing the fd values (ino number from fstat() are always the
                 // same, pointing to "/dev/ashmem").
                 int fd1 = mMem.handle->data[0];
                 int fd2 = mem->handle->data[0];
                 ret = (fd1 == fd2);
                 break;
             }
             case SENSOR_DIRECT_MEM_TYPE_GRALLOC:
                 // there is no known method to test if two gralloc handle are equivalent
                 ret = false;
                 break;
             default:
                 // should never happen
                 ALOGE("Unexpected mem type %d", mMem.type);
                 ret = true;
                 break;
         }
     }
     return ret;
 }

 } // namespace android
	/*
	* Copyright (C) 2016 The Android Open Source Project
	*
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/

	#include "SensorDevice.h"
	#include "SensorDirectConnection.h"
	#include <android/util/ProtoOutputStream.h>
	#include <frameworks/base/core/proto/android/service/sensor_service.proto.h>
	#include <hardware/sensors.h>

	#define UNUSED(x) (void)(x)

	namespace android {

	using util::ProtoOutputStream;

	SensorService::SensorDirectConnection::SensorDirectConnection(const sp<SensorService>& service,
	uid_t uid, const sensors_direct_mem_t *mem, int32_t halChannelHandle,
	const String16& opPackageName)
	: mService(service), mUid(uid), mMem(*mem),
	mHalChannelHandle(halChannelHandle),
	mOpPackageName(opPackageName), mDestroyed(false) {
	mIsRateCappedBasedOnPermission = mService->isRateCappedBasedOnPermission(mOpPackageName);
	mUserId = multiuser_get_user_id(mUid);
	ALOGD_IF(DEBUG_CONNECTIONS, "Created SensorDirectConnection");
	}

	SensorService::SensorDirectConnection::~SensorDirectConnection() {
	ALOGD_IF(DEBUG_CONNECTIONS, "~SensorDirectConnection %p", this);
	destroy();
	}

	void SensorService::SensorDirectConnection::destroy() {
	Mutex::Autolock _l(mDestroyLock);
	// destroy once only
	if (mDestroyed) {
	return;
	}

	stopAll();
	mService->cleanupConnection(this);
	if (mMem.handle != nullptr) {
	native_handle_close(mMem.handle);
	native_handle_delete(const_cast<struct native_handle*>(mMem.handle));
	}
	mDestroyed = true;
	}

	void SensorService::SensorDirectConnection::onFirstRef() {
	}

	void SensorService::SensorDirectConnection::dump(String8& result) const {
	Mutex::Autolock _l(mConnectionLock);
	result.appendFormat("\tPackage %s, HAL channel handle %d, total sensor activated %zu\n",
	String8(mOpPackageName).string(), getHalChannelHandle(), mActivated.size());
	for (auto &i : mActivated) {
	result.appendFormat("\t\tSensor %#08x, rate %d\n", i.first, i.second);
	}
	}

	/**
	* Dump debugging information as android.service.SensorDirectConnectionProto protobuf message using
	* ProtoOutputStream.
	*
	* See proto definition and some notes about ProtoOutputStream in
	* frameworks/base/core/proto/android/service/sensor_service.proto
	*/
	void SensorService::SensorDirectConnection::dump(ProtoOutputStream* proto) const {
	using namespace service::SensorDirectConnectionProto;
	Mutex::Autolock _l(mConnectionLock);
	proto->write(PACKAGE_NAME, std::string(String8(mOpPackageName).string()));
	proto->write(HAL_CHANNEL_HANDLE, getHalChannelHandle());
	proto->write(NUM_SENSOR_ACTIVATED, int(mActivated.size()));
	for (auto &i : mActivated) {
	uint64_t token = proto->start(SENSORS);
	proto->write(SensorProto::SENSOR, i.first);
	proto->write(SensorProto::RATE, i.second);
	proto->end(token);
	}
	}

	sp<BitTube> SensorService::SensorDirectConnection::getSensorChannel() const {
	return nullptr;
	}

	void SensorService::SensorDirectConnection::onSensorAccessChanged(bool hasAccess) {
	if (!hasAccess) {
	stopAll(true /* backupRecord */);
	} else {
	recoverAll();
	}
	}

	void SensorService::SensorDirectConnection::onMicSensorAccessChanged(bool isMicToggleOn) {
	if (isMicToggleOn) {
	capRates();
	} else {
	uncapRates();
	}
	}

	bool SensorService::SensorDirectConnection::hasSensorAccess() const {
	return mService->hasSensorAccess(mUid, mOpPackageName);
	}

	status_t SensorService::SensorDirectConnection::enableDisable(
	int handle, bool enabled, nsecs_t samplingPeriodNs, nsecs_t maxBatchReportLatencyNs,
	int reservedFlags) {
	// SensorDirectConnection does not support enableDisable, parameters not used
	UNUSED(handle);
	UNUSED(enabled);
	UNUSED(samplingPeriodNs);
	UNUSED(maxBatchReportLatencyNs);
	UNUSED(reservedFlags);
	return INVALID_OPERATION;
	}

	status_t SensorService::SensorDirectConnection::setEventRate(
	int handle, nsecs_t samplingPeriodNs) {
	// SensorDirectConnection does not support setEventRate, parameters not used
	UNUSED(handle);
	UNUSED(samplingPeriodNs);
	return INVALID_OPERATION;
	}

	status_t SensorService::SensorDirectConnection::flush() {
	// SensorDirectConnection does not support flush
	return INVALID_OPERATION;
	}

	int32_t SensorService::SensorDirectConnection::configureChannel(int handle, int rateLevel) {

	if (handle == -1 && rateLevel == SENSOR_DIRECT_RATE_STOP) {
	stopAll();
	mMicRateBackup.clear();
	return NO_ERROR;
	}

	if (!hasSensorAccess()) {
	return PERMISSION_DENIED;
	}

	sp<SensorInterface> si = mService->getSensorInterfaceFromHandle(handle);
	if (si == nullptr) {
	return NAME_NOT_FOUND;
	}

	const Sensor& s = si->getSensor();
	if (!SensorService::canAccessSensor(s, "config direct channel", mOpPackageName)) {
	return PERMISSION_DENIED;
	}

	if (s.getHighestDirectReportRateLevel() == 0
	\|\| rateLevel > s.getHighestDirectReportRateLevel()
	\|\| !s.isDirectChannelTypeSupported(mMem.type)) {
	return INVALID_OPERATION;
	}

	int requestedRateLevel = rateLevel;
	if (mService->isSensorInCappedSet(s.getType()) && rateLevel != SENSOR_DIRECT_RATE_STOP) {
	status_t err = mService->adjustRateLevelBasedOnMicAndPermission(&rateLevel, mOpPackageName);
	if (err != OK) {
	return err;
	}
	}

	struct sensors_direct_cfg_t config = {
	.rate_level = rateLevel
	};

	Mutex::Autolock _l(mConnectionLock);
	SensorDevice& dev(SensorDevice::getInstance());
	int ret = dev.configureDirectChannel(handle, getHalChannelHandle(), &config);

	if (rateLevel == SENSOR_DIRECT_RATE_STOP) {
	if (ret == NO_ERROR) {
	mActivated.erase(handle);
	mMicRateBackup.erase(handle);
	} else if (ret > 0) {
	ret = UNKNOWN_ERROR;
	}
	} else {
	if (ret > 0) {
	mActivated[handle] = rateLevel;
	if (mService->isSensorInCappedSet(s.getType())) {
	// Back up the rates that the app is allowed to have if the mic toggle is off
	// This is used in the uncapRates() function.
	if (!mIsRateCappedBasedOnPermission \|\|
	requestedRateLevel <= SENSOR_SERVICE_CAPPED_SAMPLING_RATE_LEVEL) {
	mMicRateBackup[handle] = requestedRateLevel;
	} else {
	mMicRateBackup[handle] = SENSOR_SERVICE_CAPPED_SAMPLING_RATE_LEVEL;
	}
	}
	}
	}

	return ret;
	}

	void SensorService::SensorDirectConnection::capRates() {
	Mutex::Autolock _l(mConnectionLock);
	const struct sensors_direct_cfg_t capConfig = {
	.rate_level = SENSOR_SERVICE_CAPPED_SAMPLING_RATE_LEVEL
	};

	const struct sensors_direct_cfg_t stopConfig = {
	.rate_level = SENSOR_DIRECT_RATE_STOP
	};

	// If our requests are in the backup, then we shouldn't activate sensors from here
	bool temporarilyStopped = mActivated.empty() && !mActivatedBackup.empty();
	std::unordered_map<int, int>& existingConnections =
	(!temporarilyStopped) ? mActivated : mActivatedBackup;

	SensorDevice& dev(SensorDevice::getInstance());
	for (auto &i : existingConnections) {
	int handle = i.first;
	int rateLevel = i.second;
	sp<SensorInterface> si = mService->getSensorInterfaceFromHandle(handle);
	if (si != nullptr) {
	const Sensor& s = si->getSensor();
	if (mService->isSensorInCappedSet(s.getType()) &&
	rateLevel > SENSOR_SERVICE_CAPPED_SAMPLING_RATE_LEVEL) {
	mMicRateBackup[handle] = rateLevel;
	// Modify the rate kept by the existing map
	existingConnections[handle] = SENSOR_SERVICE_CAPPED_SAMPLING_RATE_LEVEL;
	// Only reconfigure the channel if it's ongoing
	if (!temporarilyStopped) {
	// Stopping before reconfiguring is the well-tested path in CTS
	dev.configureDirectChannel(handle, getHalChannelHandle(), &stopConfig);
	dev.configureDirectChannel(handle, getHalChannelHandle(), &capConfig);
	}
	}
	}
	}
	}

	void SensorService::SensorDirectConnection::uncapRates() {
	Mutex::Autolock _l(mConnectionLock);

	// If our requests are in the backup, then we shouldn't activate sensors from here
	bool temporarilyStopped = mActivated.empty() && !mActivatedBackup.empty();
	std::unordered_map<int, int>& existingConnections =
	(!temporarilyStopped) ? mActivated : mActivatedBackup;

	const struct sensors_direct_cfg_t stopConfig = {
	.rate_level = SENSOR_DIRECT_RATE_STOP
	};
	SensorDevice& dev(SensorDevice::getInstance());
	for (auto &i : mMicRateBackup) {
	int handle = i.first;
	int rateLevel = i.second;

	const struct sensors_direct_cfg_t config = {
	.rate_level = rateLevel
	};

	// Modify the rate kept by the existing map
	existingConnections[handle] = rateLevel;

	// Only reconfigure the channel if it's ongoing
	if (!temporarilyStopped) {
	// Stopping before reconfiguring is the well-tested path in CTS
	dev.configureDirectChannel(handle, getHalChannelHandle(), &stopConfig);
	dev.configureDirectChannel(handle, getHalChannelHandle(), &config);
	}
	}
	mMicRateBackup.clear();
	}

	void SensorService::SensorDirectConnection::stopAll(bool backupRecord) {
	Mutex::Autolock _l(mConnectionLock);
	stopAllLocked(backupRecord);
	}

	void SensorService::SensorDirectConnection::stopAllLocked(bool backupRecord) {
	struct sensors_direct_cfg_t config = {
	.rate_level = SENSOR_DIRECT_RATE_STOP
	};

	SensorDevice& dev(SensorDevice::getInstance());
	for (auto &i : mActivated) {
	dev.configureDirectChannel(i.first, getHalChannelHandle(), &config);
	}

	if (backupRecord && mActivatedBackup.empty()) {
	mActivatedBackup = mActivated;
	}
	mActivated.clear();
	}

	void SensorService::SensorDirectConnection::recoverAll() {
	Mutex::Autolock _l(mConnectionLock);
	if (!mActivatedBackup.empty()) {
	stopAllLocked(false);

	SensorDevice& dev(SensorDevice::getInstance());

	// recover list of report from backup
	ALOG_ASSERT(mActivated.empty(),
	"mActivated must be empty if mActivatedBackup was non-empty");
	mActivated = mActivatedBackup;
	mActivatedBackup.clear();

	// re-enable them
	for (auto &i : mActivated) {
	struct sensors_direct_cfg_t config = {
	.rate_level = i.second
	};
	dev.configureDirectChannel(i.first, getHalChannelHandle(), &config);
	}
	}
	}

	int32_t SensorService::SensorDirectConnection::getHalChannelHandle() const {
	return mHalChannelHandle;
	}

	bool SensorService::SensorDirectConnection::isEquivalent(const sensors_direct_mem_t *mem) const {
	bool ret = false;

	if (mMem.type == mem->type) {
	switch (mMem.type) {
	case SENSOR_DIRECT_MEM_TYPE_ASHMEM: {
	// there is no known method to test if two ashmem fds are equivalent besides
	// trivially comparing the fd values (ino number from fstat() are always the
	// same, pointing to "/dev/ashmem").
	int fd1 = mMem.handle->data[0];
	int fd2 = mem->handle->data[0];
	ret = (fd1 == fd2);
	break;
	}
	case SENSOR_DIRECT_MEM_TYPE_GRALLOC:
	// there is no known method to test if two gralloc handle are equivalent
	ret = false;
	break;
	default:
	// should never happen
	ALOGE("Unexpected mem type %d", mMem.type);
	ret = true;
	break;
	}
	}
	return ret;
	}

	} // namespace android