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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 #ifndef ANDROID_SENSOR_DEVICE_H
     18 #define ANDROID_SENSOR_DEVICE_H
     19 
     20 #include <stdint.h>
     21 #include <sys/types.h>
     22 
     23 #include <utils/KeyedVector.h>
     24 #include <utils/Singleton.h>
     25 #include <utils/String8.h>
     26 
     27 #include <gui/Sensor.h>
     28 
     29 // ---------------------------------------------------------------------------
     30 
     31 namespace android {
     32 // ---------------------------------------------------------------------------
     33 
     34 static const nsecs_t DEFAULT_EVENTS_PERIOD = 200000000; //    5 Hz
     35 
     36 class SensorDevice : public Singleton<SensorDevice> {
     37     friend class Singleton<SensorDevice>;
     38     struct sensors_poll_device_t* mSensorDevice;
     39     struct sensors_module_t* mSensorModule;
     40     mutable Mutex mLock; // protect mActivationCount[].rates
     41     // fixed-size array after construction
     42     struct Info {
     43         Info() : delay(0) { }
     44         KeyedVector<void*, nsecs_t> rates;
     45         nsecs_t delay;
     46         status_t setDelayForIdent(void* ident, int64_t ns);
     47         nsecs_t selectDelay();
     48     };
     49     DefaultKeyedVector<int, Info> mActivationCount;
     50 
     51     SensorDevice();
     52 public:
     53     ssize_t getSensorList(sensor_t const** list);
     54     status_t initCheck() const;
     55     ssize_t poll(sensors_event_t* buffer, size_t count);
     56     status_t activate(void* ident, int handle, int enabled);
     57     status_t setDelay(void* ident, int handle, int64_t ns);
     58     void dump(String8& result, char* buffer, size_t SIZE);
     59 };
     60 
     61 // ---------------------------------------------------------------------------
     62 }; // namespace android
     63 
     64 #endif // ANDROID_SENSOR_DEVICE_H
     65