Add AOSP Geomag and Game Rotation, and Gravity

Providing AOSP software implementation of Geomag Rotation Vector, Game
Rotation Vector and Gravity sensors for platforms that does not have
hardware implementation of these sensors but do have primitive sensors
(accelerometers, gyrometers and magnetometers).

Previously, AOSP Gravity sensor is enabled only when all primitive sensors are
available. This is changed so that AOSP Gravity will be available even
no magnetometer is in the device.

Related bug/feature request:
    * b/17508800
    * b/22610016

Change-Id: I4e2d3e544884047d66e7fdbce2282f1f8234eae9
diff --git a/services/sensorservice/SensorService.cpp b/services/sensorservice/SensorService.cpp
index 1a486a3..8e2109b 100644
--- a/services/sensorservice/SensorService.cpp
+++ b/services/sensorservice/SensorService.cpp
@@ -88,11 +88,14 @@
             uint32_t virtualSensorsNeeds =
                     (1<<SENSOR_TYPE_GRAVITY) |
                     (1<<SENSOR_TYPE_LINEAR_ACCELERATION) |
-                    (1<<SENSOR_TYPE_ROTATION_VECTOR);
+                    (1<<SENSOR_TYPE_ROTATION_VECTOR) |
+                    (1<<SENSOR_TYPE_GEOMAGNETIC_ROTATION_VECTOR) |
+                    (1<<SENSOR_TYPE_GAME_ROTATION_VECTOR);
 
             mLastEventSeen.setCapacity(count);
             for (ssize_t i=0 ; i<count ; i++) {
-                registerSensor( new HardwareSensor(list[i]) );
+                bool useThisSensor=true;
+
                 switch (list[i].type) {
                     case SENSOR_TYPE_ACCELEROMETER:
                         hasAccel = true;
@@ -110,9 +113,18 @@
                     case SENSOR_TYPE_GRAVITY:
                     case SENSOR_TYPE_LINEAR_ACCELERATION:
                     case SENSOR_TYPE_ROTATION_VECTOR:
-                        virtualSensorsNeeds &= ~(1<<list[i].type);
+                    case SENSOR_TYPE_GEOMAGNETIC_ROTATION_VECTOR:
+                    case SENSOR_TYPE_GAME_ROTATION_VECTOR:
+                        if (IGNORE_HARDWARE_FUSION) {
+                            useThisSensor = false;
+                        } else {
+                            virtualSensorsNeeds &= ~(1<<list[i].type);
+                        }
                         break;
                 }
+                if (useThisSensor) {
+                    registerSensor( new HardwareSensor(list[i]) );
+                }
             }
 
             // it's safe to instantiate the SensorFusion object here
@@ -124,26 +136,15 @@
             mUserSensorList = mSensorList;
 
             if (hasGyro && hasAccel && hasMag) {
-                Sensor aSensor;
-
                 // Add Android virtual sensors if they're not already
                 // available in the HAL
+                Sensor aSensor;
 
                 aSensor = registerVirtualSensor( new RotationVectorSensor() );
                 if (virtualSensorsNeeds & (1<<SENSOR_TYPE_ROTATION_VECTOR)) {
                     mUserSensorList.add(aSensor);
                 }
 
-                aSensor = registerVirtualSensor( new GravitySensor(list, count) );
-                if (virtualSensorsNeeds & (1<<SENSOR_TYPE_GRAVITY)) {
-                    mUserSensorList.add(aSensor);
-                }
-
-                aSensor = registerVirtualSensor( new LinearAccelerationSensor(list, count) );
-                if (virtualSensorsNeeds & (1<<SENSOR_TYPE_LINEAR_ACCELERATION)) {
-                    mUserSensorList.add(aSensor);
-                }
-
                 aSensor = registerVirtualSensor( new OrientationSensor() );
                 if (virtualSensorsNeeds & (1<<SENSOR_TYPE_ROTATION_VECTOR)) {
                     // if we are doing our own rotation-vector, also add
@@ -151,11 +152,46 @@
                     mUserSensorList.replaceAt(aSensor, orientationIndex);
                 }
 
+                aSensor = registerVirtualSensor(
+                                new LinearAccelerationSensor(list, count) );
+                if (virtualSensorsNeeds &
+                            (1<<SENSOR_TYPE_LINEAR_ACCELERATION)) {
+                    mUserSensorList.add(aSensor);
+                }
+
                 // virtual debugging sensors are not added to mUserSensorList
                 registerVirtualSensor( new CorrectedGyroSensor(list, count) );
                 registerVirtualSensor( new GyroDriftSensor() );
             }
 
+            if (hasAccel && hasGyro) {
+                Sensor aSensor;
+
+                aSensor = registerVirtualSensor(
+                                new GravitySensor(list, count) );
+                if (virtualSensorsNeeds & (1<<SENSOR_TYPE_GRAVITY)) {
+                    mUserSensorList.add(aSensor);
+                }
+
+                aSensor = registerVirtualSensor(
+                                new GameRotationVectorSensor() );
+                if (virtualSensorsNeeds &
+                            (1<<SENSOR_TYPE_GAME_ROTATION_VECTOR)) {
+                    mUserSensorList.add(aSensor);
+                }
+            }
+
+            if (hasAccel && hasMag) {
+                Sensor aSensor;
+
+                aSensor = registerVirtualSensor(
+                                new GeoMagRotationVectorSensor() );
+                if (virtualSensorsNeeds &
+                        (1<<SENSOR_TYPE_GEOMAGNETIC_ROTATION_VECTOR)) {
+                    mUserSensorList.add(aSensor);
+                }
+            }
+
             // debugging sensor list
             mUserSensorListDebug = mSensorList;