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      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 #define LOG_TAG "Sensors"
     18 
     19 #include <stdint.h>
     20 #include <sys/types.h>
     21 
     22 #include <utils/Errors.h>
     23 #include <utils/RefBase.h>
     24 #include <utils/Looper.h>
     25 
     26 #include <gui/Sensor.h>
     27 #include <gui/BitTube.h>
     28 #include <gui/SensorEventQueue.h>
     29 #include <gui/ISensorEventConnection.h>
     30 
     31 #include <android/sensor.h>
     32 
     33 // ----------------------------------------------------------------------------
     34 namespace android {
     35 // ----------------------------------------------------------------------------
     36 
     37 SensorEventQueue::SensorEventQueue(const sp<ISensorEventConnection>& connection)
     38     : mSensorEventConnection(connection)
     39 {
     40 }
     41 
     42 SensorEventQueue::~SensorEventQueue()
     43 {
     44 }
     45 
     46 void SensorEventQueue::onFirstRef()
     47 {
     48     mSensorChannel = mSensorEventConnection->getSensorChannel();
     49 }
     50 
     51 int SensorEventQueue::getFd() const
     52 {
     53     return mSensorChannel->getFd();
     54 }
     55 
     56 
     57 ssize_t SensorEventQueue::write(const sp<BitTube>& tube,
     58         ASensorEvent const* events, size_t numEvents) {
     59     return BitTube::sendObjects(tube, events, numEvents);
     60 }
     61 
     62 ssize_t SensorEventQueue::read(ASensorEvent* events, size_t numEvents)
     63 {
     64     return BitTube::recvObjects(mSensorChannel, events, numEvents);
     65 }
     66 
     67 sp<Looper> SensorEventQueue::getLooper() const
     68 {
     69     Mutex::Autolock _l(mLock);
     70     if (mLooper == 0) {
     71         mLooper = new Looper(true);
     72         mLooper->addFd(getFd(), getFd(), ALOOPER_EVENT_INPUT, NULL, NULL);
     73     }
     74     return mLooper;
     75 }
     76 
     77 status_t SensorEventQueue::waitForEvent() const
     78 {
     79     const int fd = getFd();
     80     sp<Looper> looper(getLooper());
     81 
     82     int events;
     83     int32_t result;
     84     do {
     85         result = looper->pollOnce(-1, NULL, &events, NULL);
     86         if (result == ALOOPER_POLL_ERROR) {
     87             ALOGE("SensorEventQueue::waitForEvent error (errno=%d)", errno);
     88             result = -EPIPE; // unknown error, so we make up one
     89             break;
     90         }
     91         if (events & ALOOPER_EVENT_HANGUP) {
     92             // the other-side has died
     93             ALOGE("SensorEventQueue::waitForEvent error HANGUP");
     94             result = -EPIPE; // unknown error, so we make up one
     95             break;
     96         }
     97     } while (result != fd);
     98 
     99     return  (result == fd) ? status_t(NO_ERROR) : result;
    100 }
    101 
    102 status_t SensorEventQueue::wake() const
    103 {
    104     sp<Looper> looper(getLooper());
    105     looper->wake();
    106     return NO_ERROR;
    107 }
    108 
    109 status_t SensorEventQueue::enableSensor(Sensor const* sensor) const {
    110     return mSensorEventConnection->enableDisable(sensor->getHandle(), true);
    111 }
    112 
    113 status_t SensorEventQueue::disableSensor(Sensor const* sensor) const {
    114     return mSensorEventConnection->enableDisable(sensor->getHandle(), false);
    115 }
    116 
    117 status_t SensorEventQueue::enableSensor(int32_t handle, int32_t us) const {
    118     status_t err = mSensorEventConnection->enableDisable(handle, true);
    119     if (err == NO_ERROR) {
    120         mSensorEventConnection->setEventRate(handle, us2ns(us));
    121     }
    122     return err;
    123 }
    124 
    125 status_t SensorEventQueue::disableSensor(int32_t handle) const {
    126     return mSensorEventConnection->enableDisable(handle, false);
    127 }
    128 
    129 status_t SensorEventQueue::setEventRate(Sensor const* sensor, nsecs_t ns) const {
    130     return mSensorEventConnection->setEventRate(sensor->getHandle(), ns);
    131 }
    132 
    133 // ----------------------------------------------------------------------------
    134 }; // namespace android
    135 
    136