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/*
* Copyright (C) 2010 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.
*/
#define LOG_TAG "Sensors"
#include <stdint.h>
#include <sys/types.h>
#include <utils/Errors.h>
#include <utils/RefBase.h>
#include <utils/Singleton.h>
#include <binder/IBinder.h>
#include <binder/IServiceManager.h>
#include <gui/ISensorServer.h>
#include <gui/ISensorEventConnection.h>
#include <gui/Sensor.h>
#include <gui/SensorManager.h>
#include <gui/SensorEventQueue.h>
// ----------------------------------------------------------------------------
namespace android {
// ----------------------------------------------------------------------------
android::Mutex android::SensorManager::sLock;
std::map<String16, SensorManager*> android::SensorManager::sPackageInstances;
SensorManager& SensorManager::getInstanceForPackage(const String16& packageName) {
Mutex::Autolock _l(sLock);
SensorManager* sensorManager;
std::map<String16, SensorManager*>::iterator iterator =
sPackageInstances.find(packageName);
if (iterator != sPackageInstances.end()) {
sensorManager = iterator->second;
} else {
String16 opPackageName = packageName;
// It is possible that the calling code has no access to the package name.
// In this case we will get the packages for the calling UID and pick the
// first one for attributing the app op. This will work correctly for
// runtime permissions as for legacy apps we will toggle the app op for
// all packages in the UID. The caveat is that the operation may be attributed
// to the wrong package and stats based on app ops may be slightly off.
if (opPackageName.size() <= 0) {
sp<IBinder> binder = defaultServiceManager()->getService(String16("permission"));
if (binder != 0) {
const uid_t uid = IPCThreadState::self()->getCallingUid();
Vector<String16> packages;
interface_cast<IPermissionController>(binder)->getPackagesForUid(uid, packages);
if (!packages.isEmpty()) {
opPackageName = packages[0];
} else {
ALOGE("No packages for calling UID");
}
} else {
ALOGE("Cannot get permission service");
}
}
sensorManager = new SensorManager(opPackageName);
// If we had no package name, we looked it up from the UID and the sensor
// manager instance we created should also be mapped to the empty package
// name, to avoid looking up the packages for a UID and get the same result.
if (packageName.size() <= 0) {
sPackageInstances.insert(std::make_pair(String16(), sensorManager));
}
// Stash the per package sensor manager.
sPackageInstances.insert(std::make_pair(opPackageName, sensorManager));
}
return *sensorManager;
}
SensorManager::SensorManager(const String16& opPackageName)
: mSensorList(0), mOpPackageName(opPackageName)
{
// okay we're not locked here, but it's not needed during construction
assertStateLocked();
}
SensorManager::~SensorManager()
{
free(mSensorList);
}
void SensorManager::sensorManagerDied()
{
Mutex::Autolock _l(mLock);
mSensorServer.clear();
free(mSensorList);
mSensorList = NULL;
mSensors.clear();
}
status_t SensorManager::assertStateLocked() const {
bool initSensorManager = false;
if (mSensorServer == NULL) {
initSensorManager = true;
} else {
// Ping binder to check if sensorservice is alive.
status_t err = IInterface::asBinder(mSensorServer)->pingBinder();
if (err != NO_ERROR) {
initSensorManager = true;
}
}
if (initSensorManager) {
// try for 300 seconds (60*5(getService() tries for 5 seconds)) before giving up ...
const String16 name("sensorservice");
for (int i = 0; i < 60; i++) {
status_t err = getService(name, &mSensorServer);
if (err == NAME_NOT_FOUND) {
sleep(1);
continue;
}
if (err != NO_ERROR) {
return err;
}
break;
}
class DeathObserver : public IBinder::DeathRecipient {
SensorManager& mSensorManger;
virtual void binderDied(const wp<IBinder>& who) {
ALOGW("sensorservice died [%p]", who.unsafe_get());
mSensorManger.sensorManagerDied();
}
public:
DeathObserver(SensorManager& mgr) : mSensorManger(mgr) { }
};
LOG_ALWAYS_FATAL_IF(mSensorServer.get() == NULL, "getService(SensorService) NULL");
mDeathObserver = new DeathObserver(*const_cast<SensorManager *>(this));
IInterface::asBinder(mSensorServer)->linkToDeath(mDeathObserver);
mSensors = mSensorServer->getSensorList(mOpPackageName);
size_t count = mSensors.size();
mSensorList =
static_cast<Sensor const**>(malloc(count * sizeof(Sensor*)));
LOG_ALWAYS_FATAL_IF(mSensorList == NULL, "mSensorList NULL");
for (size_t i=0 ; i<count ; i++) {
mSensorList[i] = mSensors.array() + i;
}
}
return NO_ERROR;
}
ssize_t SensorManager::getSensorList(Sensor const* const** list) const
{
Mutex::Autolock _l(mLock);
status_t err = assertStateLocked();
if (err < 0) {
return static_cast<ssize_t>(err);
}
*list = mSensorList;
return static_cast<ssize_t>(mSensors.size());
}
Sensor const* SensorManager::getDefaultSensor(int type)
{
Mutex::Autolock _l(mLock);
if (assertStateLocked() == NO_ERROR) {
bool wakeUpSensor = false;
// For the following sensor types, return a wake-up sensor. These types are by default
// defined as wake-up sensors. For the rest of the sensor types defined in sensors.h return
// a non_wake-up version.
if (type == SENSOR_TYPE_PROXIMITY || type == SENSOR_TYPE_SIGNIFICANT_MOTION ||
type == SENSOR_TYPE_TILT_DETECTOR || type == SENSOR_TYPE_WAKE_GESTURE ||
type == SENSOR_TYPE_GLANCE_GESTURE || type == SENSOR_TYPE_PICK_UP_GESTURE) {
wakeUpSensor = true;
}
// For now we just return the first sensor of that type we find.
// in the future it will make sense to let the SensorService make
// that decision.
for (size_t i=0 ; i<mSensors.size() ; i++) {
if (mSensorList[i]->getType() == type &&
mSensorList[i]->isWakeUpSensor() == wakeUpSensor) {
return mSensorList[i];
}
}
}
return NULL;
}
sp<SensorEventQueue> SensorManager::createEventQueue(String8 packageName, int mode) {
sp<SensorEventQueue> queue;
Mutex::Autolock _l(mLock);
while (assertStateLocked() == NO_ERROR) {
sp<ISensorEventConnection> connection =
mSensorServer->createSensorEventConnection(packageName, mode, mOpPackageName);
if (connection == NULL) {
// SensorService just died or the app doesn't have required permissions.
ALOGE("createEventQueue: connection is NULL.");
return NULL;
}
queue = new SensorEventQueue(connection);
break;
}
return queue;
}
bool SensorManager::isDataInjectionEnabled() {
Mutex::Autolock _l(mLock);
if (assertStateLocked() == NO_ERROR) {
return mSensorServer->isDataInjectionEnabled();
}
return false;
}
// ----------------------------------------------------------------------------
}; // namespace android
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