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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_SINGLETON_STATIC_INSTANCE(SensorManager)
SensorManager::SensorManager()
: mSensorList(0)
{
// 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 {
if (mSensorServer == NULL) {
// try for one second
const String16 name("sensorservice");
for (int i=0 ; i<4 ; i++) {
status_t err = getService(name, &mSensorServer);
if (err == NAME_NOT_FOUND) {
usleep(250000);
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) { }
};
mDeathObserver = new DeathObserver(*const_cast<SensorManager *>(this));
mSensorServer->asBinder()->linkToDeath(mDeathObserver);
mSensors = mSensorServer->getSensorList();
size_t count = mSensors.size();
mSensorList = (Sensor const**)malloc(count * sizeof(Sensor*));
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 ssize_t(err);
}
*list = mSensorList;
return mSensors.size();
}
Sensor const* SensorManager::getDefaultSensor(int type)
{
Mutex::Autolock _l(mLock);
if (assertStateLocked() == NO_ERROR) {
// 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)
return mSensorList[i];
}
}
return NULL;
}
sp<SensorEventQueue> SensorManager::createEventQueue()
{
sp<SensorEventQueue> queue;
Mutex::Autolock _l(mLock);
while (assertStateLocked() == NO_ERROR) {
sp<ISensorEventConnection> connection =
mSensorServer->createSensorEventConnection();
if (connection == NULL) {
// SensorService just died.
ALOGE("createEventQueue: connection is NULL. SensorService died.");
continue;
}
queue = new SensorEventQueue(connection);
break;
}
return queue;
}
// ----------------------------------------------------------------------------
}; // namespace android
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