add skeleton for car service and car api
- car service: system uid with system signature, starts in PRE_BOOT_COMPLETED
- added minimal skeleton implementation for proof of convept for several key ideas:
Car api, CarServiceLoader interface, CarActivity abstraction
- Also adding CarSensorManager/Service for defining flow in HAL initialization.
bug: 22701368, 22702215
Change-Id: If664bbd7b939102b7ea48bdde61ec068c42582cd
(cherry picked from commit d58724adeb671998c511995e177874a3eea025df)
diff --git a/service/src/com/android/car/DrivingStatePolicy.java b/service/src/com/android/car/DrivingStatePolicy.java
new file mode 100644
index 0000000..de91318
--- /dev/null
+++ b/service/src/com/android/car/DrivingStatePolicy.java
@@ -0,0 +1,207 @@
+/*
+ * Copyright (C) 2015 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.
+ */
+
+package com.android.car;
+
+import android.content.Context;
+import android.os.SystemClock;
+import android.support.car.Car;
+import android.support.car.CarSensorEvent;
+import android.support.car.CarSensorManager;
+import android.support.car.ICarSensorEventListener;
+import android.util.Log;
+
+import com.android.car.hal.SensorHalBase.SensorListener;
+
+import java.io.PrintWriter;
+
+/**
+ * Logical sensor implementing driving state policy. This policy sets only two states:
+ * no restriction vs fully restrictive. To enter no restriction state, speed should be zero
+ * while either parking brake is applied or transmission gear is in P.
+ */
+public class DrivingStatePolicy extends CarSensorService.LogicalSensorHalBase {
+
+ private final Context mContext;
+ private CarSensorService mSensorService;
+ private int mDringState = CarSensorEvent.DRIVE_STATUS_FULLY_RESTRICTED;
+ private SensorListener mSensorListener;
+ private boolean mIsReady = false;
+ private boolean mStarted = false;
+
+ private static final int[] SUPPORTED_SENSORS = { CarSensorManager.SENSOR_TYPE_DRIVING_STATUS };
+
+ private final ICarSensorEventListener mICarSensorEventListener =
+ new ICarSensorEventListener.Stub() {
+ @Override
+ public void onSensorChanged(CarSensorEvent event) {
+ handleSensorEvent(event);
+ }
+ };
+
+ public DrivingStatePolicy(Context context) {
+ mContext = context;
+ }
+
+ @Override
+ public void init() {
+ mIsReady = true;
+ }
+
+ @Override
+ public synchronized void onSensorServiceReady() {
+ mSensorService =
+ (CarSensorService) ICarImpl.getInstance(mContext).getCarService(Car.SENSOR_SERVICE);
+ int sensorList[] = mSensorService.getSupportedSensors();
+ boolean hasSpeed = subscribeIfSupportedLocked(sensorList,
+ CarSensorManager.SENSOR_TYPE_CAR_SPEED, CarSensorManager.SENSOR_RATE_FASTEST);
+ if (!hasSpeed) {
+ Log.w(CarLog.TAG_SENSOR,
+ "No speed sensor from car. Driving state will be always fully restrictive");
+ }
+ boolean hasParkingBrake = subscribeIfSupportedLocked(sensorList,
+ CarSensorManager.SENSOR_TYPE_PARKING_BRAKE, CarSensorManager.SENSOR_RATE_FASTEST);
+ boolean hasGear = subscribeIfSupportedLocked(sensorList, CarSensorManager.SENSOR_TYPE_GEAR,
+ CarSensorManager.SENSOR_RATE_FASTEST);
+ if (!hasParkingBrake && !hasGear) {
+ Log.w(CarLog.TAG_SENSOR,
+ "No brake info from car. Driving state will be always fully restrictive");
+ }
+ }
+
+ @Override
+ public void release() {
+ // TODO Auto-generated method stub
+ }
+
+ @Override
+ public synchronized CarSensorEvent getDefaultValue(int sensorType) {
+ if (sensorType != CarSensorManager.SENSOR_TYPE_DRIVING_STATUS) {
+ Log.w(CarLog.TAG_SENSOR, "getCurrentValue to DrivingStatePolicy with sensorType:" +
+ sensorType);
+ return null;
+ }
+ return createEvent(mDringState);
+ }
+
+ @Override
+ public synchronized void registerSensorListener(SensorListener listener) {
+ mSensorListener = listener;
+ if (mIsReady) {
+ mSensorListener.onSensorHalReady(this);
+ }
+ }
+
+ @Override
+ public synchronized boolean isReady() {
+ return mIsReady;
+ }
+
+ @Override
+ public int[] getSupportedSensors() {
+ return SUPPORTED_SENSORS;
+ }
+
+ @Override
+ public synchronized boolean requestSensorStart(int sensorType, int rate) {
+ mStarted = true;
+ mSensorListener.onSensorData(createEvent(mDringState));
+ return true;
+ }
+
+ @Override
+ public synchronized void requestSensorStop(int sensorType) {
+ mStarted = false;
+ }
+
+ @Override
+ public void dump(PrintWriter writer) {
+ // TODO Auto-generated method stub
+ }
+
+ private boolean subscribeIfSupportedLocked(int sensorList[], int sensorType, int rate) {
+ if (!CarSensorManager.isSensorSupported(sensorList, sensorType)) {
+ Log.i(CarLog.TAG_SENSOR, "Sensor not supported:" + sensorType);
+ return false;
+ }
+ return mSensorService.registerOrUpdateSensorListener(sensorType, rate,
+ CarSensorService.VERSION, mICarSensorEventListener);
+ }
+
+ private synchronized void handleSensorEvent(CarSensorEvent event) {
+ switch (event.sensorType) {
+ case CarSensorManager.SENSOR_TYPE_PARKING_BRAKE:
+ case CarSensorManager.SENSOR_TYPE_GEAR:
+ case CarSensorManager.SENSOR_TYPE_CAR_SPEED:
+ int drivingState = recalcDrivingStateLocked();
+ if (drivingState != mDringState && mSensorListener != null) {
+ mDringState = drivingState;
+ mSensorListener.onSensorData(createEvent(mDringState));
+ }
+ break;
+ default:
+ break;
+ }
+ }
+
+ private int recalcDrivingStateLocked() {
+ int drivingState = CarSensorEvent.DRIVE_STATUS_FULLY_RESTRICTED;
+ CarSensorEvent lastParkingBrake = mSensorService.getLatestSensorEvent(
+ CarSensorManager.SENSOR_TYPE_PARKING_BRAKE);
+ CarSensorEvent lastGear = mSensorService.getLatestSensorEvent(
+ CarSensorManager.SENSOR_TYPE_GEAR);
+ CarSensorEvent lastSpeed = mSensorService.getLatestSensorEvent(
+ CarSensorManager.SENSOR_TYPE_CAR_SPEED);
+ if (lastSpeed != null && lastSpeed.floatValues[0] == 0f) { // stopped
+ if (lastParkingBrake == null && isParkingBrakeApplied(lastParkingBrake)) {
+ if (lastGear != null && isGearInParkingOrNeutral(lastGear)) {
+ drivingState = CarSensorEvent.DRIVE_STATUS_UNRESTRICTED;
+ }
+ } else { // parking break not applied or not available
+ if (lastGear != null && isGearInParking(lastGear)) { // gear in P
+ drivingState = CarSensorEvent.DRIVE_STATUS_UNRESTRICTED;
+ }
+ }
+ } // else moving, full restriction
+ return drivingState;
+ }
+
+ private boolean isSpeedZero(CarSensorEvent event) {
+ return event.floatValues[0] == 0f;
+ }
+
+ private boolean isParkingBrakeApplied(CarSensorEvent event) {
+ return event.byteValues[0] == 1;
+ }
+
+ private boolean isGearInParkingOrNeutral(CarSensorEvent event) {
+ byte gear = event.byteValues[0];
+ return (gear == ((byte) CarSensorEvent.GEAR_NEUTRAL & 0xff)) ||
+ (gear == ((byte) CarSensorEvent.GEAR_PARK & 0xff));
+ }
+
+ private boolean isGearInParking(CarSensorEvent event) {
+ byte gear = event.byteValues[0];
+ return gear == ((byte) CarSensorEvent.GEAR_PARK & 0xff);
+ }
+
+ private CarSensorEvent createEvent(int drivingState) {
+ CarSensorEvent event = new CarSensorEvent(CarSensorManager.SENSOR_TYPE_DRIVING_STATUS,
+ SystemClock.elapsedRealtimeNanos(), 0, 1);
+ event.byteValues[0] = (byte) (drivingState & 0xff);
+ return event;
+ }
+}