Sensor related changes for NDK.

i) ASensorManager_getDefaultSensor returns a wake-up/non wake-up sensor
      depending on the type.
   ii) Add ASensor_isWakeUpSensor and ASensorManager_getDefaultSensorEx
       methods.
Bug : 16399898
Change-Id: I1a86fb8d9de23039fdf41679d1487e1cd761a9d0

include/android/sensor.h

@@ -210,10 +210,17 @@ int ASensorManager_getSensorList(ASensorManager* manager, ASensorList* list);
 
 /*
  * Returns the default sensor for the given type, or NULL if no sensor
- * of that type exist.
+ * of that type exists.
  */
 ASensor const* ASensorManager_getDefaultSensor(ASensorManager* manager, int type);
 
+/*
+ * Returns the default sensor with the given type and wakeUp properties or NULL if no sensor
+ * of this type and wakeUp properties exists.
+ */
+ASensor const* ASensorManager_getDefaultSensorEx(ASensorManager* manager, int type,
+        bool wakeUp);
+
 /*
  * Creates a new sensor event queue and associate it with a looper.
  */
@@ -321,6 +328,11 @@ const char* ASensor_getStringType(ASensor const* sensor);
  */
 int ASensor_getReportingMode(ASensor const* sensor);
 
+/*
+ * Returns true if this is a wake up sensor, false otherwise.
+ */
+bool ASensor_isWakeUpSensor(ASensor const* sensor);
+
 #ifdef __cplusplus
 };
 #endif

libs/gui/SensorManager.cpp

@@ -116,12 +116,23 @@ 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)
+            if (mSensorList[i]->getType() == type &&
+                mSensorList[i]->isWakeUpSensor() == wakeUpSensor) {
                 return mSensorList[i];
+            }
         }
     }
     return NULL;