Add versioning to FLP HAL.

Retain compatibility with implementations compiled
against old headers or left unchanged from LMP.

Change-Id: I3f7cfaaf0cba8697c312940a805b053c6040caa6

7 files changed, 74 insertions, 3 deletions

diff --git a/core/java/android/hardware/location/GeofenceHardwareImpl.java b/core/java/android/hardware/location/GeofenceHardwareImpl.java
index 5d40e94..b34c9fb 100644
--- a/core/java/android/hardware/location/GeofenceHardwareImpl.java
+++ b/core/java/android/hardware/location/GeofenceHardwareImpl.java
@@ -41,6 +41,7 @@ import java.util.Iterator;
 public final class GeofenceHardwareImpl {
     private static final String TAG = "GeofenceHardwareImpl";
     private static final boolean DEBUG = Log.isLoggable(TAG, Log.DEBUG);
+    private static final int FIRST_VERSION_WITH_CAPABILITIES = 2;
 
     private final Context mContext;
     private static GeofenceHardwareImpl sInstance;
@@ -54,6 +55,7 @@ public final class GeofenceHardwareImpl {
     private IFusedGeofenceHardware mFusedService;
     private IGpsGeofenceHardware mGpsService;
     private int mCapabilities;
+    private int mVersion = 1;
 
     private int[] mSupportedMonitorTypes = new int[GeofenceHardware.NUM_MONITORS];
 
@@ -145,8 +147,10 @@ public final class GeofenceHardwareImpl {
     private void updateFusedHardwareAvailability() {
         boolean fusedSupported;
         try {
+            final boolean hasGnnsCapabilities = (mVersion < FIRST_VERSION_WITH_CAPABILITIES)
+                    || (mCapabilities & CAPABILITY_GNSS) != 0;
             fusedSupported = (mFusedService != null
-                    ? mFusedService.isSupported() && (mCapabilities & CAPABILITY_GNSS) != 0
+                    ? mFusedService.isSupported() && hasGnnsCapabilities
                     : false);
         } catch (RemoteException e) {
             Log.e(TAG, "RemoteException calling LocationManagerService");
@@ -177,6 +181,11 @@ public final class GeofenceHardwareImpl {
         updateFusedHardwareAvailability();
     }
 
+    public void setVersion(int version) {
+        mVersion = version;
+        updateFusedHardwareAvailability();
+    }
+
     public void setFusedGeofenceHardware(IFusedGeofenceHardware service) {
         if(mFusedService == null) {
             mFusedService = service;
diff --git a/core/java/android/hardware/location/IFusedLocationHardware.aidl b/core/java/android/hardware/location/IFusedLocationHardware.aidl
index 3de766a..2ea4d23 100644
--- a/core/java/android/hardware/location/IFusedLocationHardware.aidl
+++ b/core/java/android/hardware/location/IFusedLocationHardware.aidl
@@ -121,4 +121,9 @@ interface IFusedLocationHardware {
      * of the locations returned in this call.
      */
     void flushBatchedLocations() = 11;
+
+    /**
+     * Returns the version of this FLP HAL implementation.
+     */
+    int getVersion() = 12;
 }
diff --git a/location/lib/java/com/android/location/provider/FusedLocationHardware.java b/location/lib/java/com/android/location/provider/FusedLocationHardware.java
index 480a18c..eb3b2f4 100644
--- a/location/lib/java/com/android/location/provider/FusedLocationHardware.java
+++ b/location/lib/java/com/android/location/provider/FusedLocationHardware.java
@@ -216,6 +216,26 @@ public final class FusedLocationHardware {
         }
     }
 
+
+    /**
+     * Returns the version of the FLP HAL.
+     *
+     * <p>Version 1 is the initial release.
+     * <p>Version 2 adds the ability to use {@link #flushBatchedLocations},
+     * {@link FusedLocationHardwareSink#onCapabilities}, and
+     * {@link FusedLocationHardwareSink#onStatusChanged}.
+     *
+     * <p>This method is only available on API 23 or later.  Older APIs have version 1.
+     */
+    public int getVersion() {
+        try {
+            return mLocationHardware.getVersion();
+        } catch(RemoteException e) {
+            Log.e(TAG, "RemoteException at getVersion");
+        }
+        return 1;
+    }
+
     /*
      * Helper methods and classes
      */
diff --git a/location/lib/java/com/android/location/provider/FusedLocationHardwareSink.java b/location/lib/java/com/android/location/provider/FusedLocationHardwareSink.java
index 618d5d6..01d37ac 100644
--- a/location/lib/java/com/android/location/provider/FusedLocationHardwareSink.java
+++ b/location/lib/java/com/android/location/provider/FusedLocationHardwareSink.java
@@ -54,7 +54,8 @@ public class FusedLocationHardwareSink {
     /**
      * Called when the status changes in the underlying FLP HAL
      * implementation (the ability to compute location).  This
-     * callback will only be made on API 23 or later.
+     * callback will only be made on version 2 or later
+     * (see {@link FusedLocationHardware#getVersion()}).
      *
      * @param status One of FLP_STATUS_LOCATION_AVAILABLE or
      *               FLP_STATUS_LOCATION_UNAVAILABLE as defined in
diff --git a/services/core/java/com/android/server/location/FlpHardwareProvider.java b/services/core/java/com/android/server/location/FlpHardwareProvider.java
index 834dff2..1fb22be 100644
--- a/services/core/java/com/android/server/location/FlpHardwareProvider.java
+++ b/services/core/java/com/android/server/location/FlpHardwareProvider.java
@@ -42,11 +42,13 @@ import android.util.Log;
  * {@hide}
  */
 public class FlpHardwareProvider {
+    private static final int FIRST_VERSION_WITH_FLUSH_LOCATIONS = 2;
     private GeofenceHardwareImpl mGeofenceHardwareSink = null;
     private IFusedLocationHardwareSink mLocationSink = null;
     // Capabilities provided by FlpCallbacks
     private boolean mHaveBatchingCapabilities;
     private int mBatchingCapabilities;
+    private int mVersion;
 
     private static FlpHardwareProvider sSingletonInstance = null;
 
@@ -150,6 +152,11 @@ public class FlpHardwareProvider {
         }
     }
 
+    private void setVersion(int version) {
+        mVersion = version;
+        getGeofenceHardwareSink().setVersion(version);
+    }
+
     private void maybeSendCapabilities() {
         IFusedLocationHardwareSink sink;
         boolean haveBatchingCapabilities;
@@ -366,7 +373,12 @@ public class FlpHardwareProvider {
 
         @Override
         public void flushBatchedLocations() {
-            nativeFlushBatchedLocations();
+            if (mVersion >= FIRST_VERSION_WITH_FLUSH_LOCATIONS) {
+                nativeFlushBatchedLocations();
+            } else {
+                Log.wtf(TAG,
+                        "Tried to call flushBatchedLocations on an unsupported implementation");
+            }
         }
 
         @Override
@@ -388,6 +400,11 @@ public class FlpHardwareProvider {
         public void injectDeviceContext(int deviceEnabledContext) {
             nativeInjectDeviceContext(deviceEnabledContext);
         }
+
+        @Override
+        public int getVersion() {
+            return mVersion;
+        }
     };
 
     private final IFusedGeofenceHardware mGeofenceHardwareService =
diff --git a/services/core/java/com/android/server/location/FusedLocationHardwareSecure.java b/services/core/java/com/android/server/location/FusedLocationHardwareSecure.java
index e49c411..a08d326 100644
--- a/services/core/java/com/android/server/location/FusedLocationHardwareSecure.java
+++ b/services/core/java/com/android/server/location/FusedLocationHardwareSecure.java
@@ -122,4 +122,10 @@ public class FusedLocationHardwareSecure extends IFusedLocationHardware.Stub {
         checkPermissions();
         mLocationHardware.flushBatchedLocations();
     }
+
+    @Override
+    public int getVersion() throws RemoteException {
+        checkPermissions();
+        return mLocationHardware.getVersion();
+    }
 }
diff --git a/services/core/jni/com_android_server_location_FlpHardwareProvider.cpp b/services/core/jni/com_android_server_location_FlpHardwareProvider.cpp
index 852b5e9..2ca5f5a 100644
--- a/services/core/jni/com_android_server_location_FlpHardwareProvider.cpp
+++ b/services/core/jni/com_android_server_location_FlpHardwareProvider.cpp
@@ -31,6 +31,7 @@ static jobject sCallbacksObj = NULL;
 static JNIEnv *sCallbackEnv = NULL;
 static hw_device_t* sHardwareDevice = NULL;
 
+static jmethodID sSetVersion = NULL;
 static jmethodID sOnLocationReport = NULL;
 static jmethodID sOnDataReport = NULL;
 static jmethodID sOnBatchingCapabilities = NULL;
@@ -141,6 +142,14 @@ static int SetThreadEvent(ThreadEvent event) {
       }
 
       ALOGV("Callback thread attached: %p", sCallbackEnv);
+
+      // Send the version to the upper layer.
+      sCallbackEnv->CallVoidMethod(
+            sCallbacksObj,
+            sSetVersion,
+            sFlpInterface->size == sizeof(FlpLocationInterface) ? 2 : 1
+            );
+      CheckExceptions(sCallbackEnv, __FUNCTION__);
       break;
     }
     case DISASSOCIATE_JVM:
@@ -176,6 +185,10 @@ static void ClassInit(JNIEnv* env, jclass clazz) {
   sFlpInterface = NULL;
 
   // get references to the Java provider methods
+  sSetVersion = env->GetMethodID(
+        clazz,
+        "setVersion",
+        "(I)V");
   sOnLocationReport = env->GetMethodID(
       clazz,
       "onLocationReport",