| /* |
| * Copyright (C) 2019 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.server.location; |
| |
| import android.location.GnssMeasurementCorrections; |
| import android.os.Handler; |
| import android.util.Log; |
| |
| import com.android.internal.annotations.VisibleForTesting; |
| |
| /** |
| * Manages GNSS measurement corrections. |
| * |
| * <p>Implements the framework side of the GNSS HAL interfaces {@code IMeasurementCorrections.hal} |
| * and {@code IMeasurementCorrectionsCallback.hal). |
| * |
| * @hide |
| */ |
| public class GnssMeasurementCorrectionsProvider { |
| private static final String TAG = "GnssMeasurementCorrectionsProvider"; |
| |
| // These must match with the Capabilities enum in IMeasurementCorrectionsCallback.hal. |
| static final int CAPABILITY_LOS_SATS = 0x0000001; |
| static final int CAPABILITY_EXCESS_PATH_LENGTH = 0x0000002; |
| static final int CAPABILITY_REFLECTING_PLANE = 0x0000004; |
| |
| private static final int INVALID_CAPABILITIES = 1 << 31; |
| |
| private final Handler mHandler; |
| private final GnssMeasurementCorrectionsProviderNative mNative; |
| private volatile int mCapabilities = INVALID_CAPABILITIES; |
| |
| GnssMeasurementCorrectionsProvider(Handler handler) { |
| this(handler, new GnssMeasurementCorrectionsProviderNative()); |
| } |
| |
| @VisibleForTesting |
| GnssMeasurementCorrectionsProvider(Handler handler, |
| GnssMeasurementCorrectionsProviderNative aNative) { |
| mHandler = handler; |
| mNative = aNative; |
| } |
| |
| /** |
| * Returns {@code true} if the GNSS HAL implementation supports measurement corrections. |
| */ |
| public boolean isAvailableInPlatform() { |
| return mNative.isMeasurementCorrectionsSupported(); |
| } |
| |
| /** |
| * Injects GNSS measurement corrections into the GNSS chipset. |
| * |
| * @param measurementCorrections a {@link GnssMeasurementCorrections} object with the GNSS |
| * measurement corrections to be injected into the GNSS chipset. |
| */ |
| public void injectGnssMeasurementCorrections( |
| GnssMeasurementCorrections measurementCorrections) { |
| if (!isCapabilitiesReceived()) { |
| Log.w(TAG, "Failed to inject GNSS measurement corrections. Capabilities " |
| + "not received yet."); |
| return; |
| } |
| mHandler.post(() -> { |
| if (!mNative.injectGnssMeasurementCorrections(measurementCorrections)) { |
| Log.e(TAG, "Failure in injecting GNSS corrections."); |
| } |
| }); |
| } |
| |
| /** Handle measurement corrections capabilities update from the GNSS HAL implementation. */ |
| boolean onCapabilitiesUpdated(int capabilities) { |
| if (hasCapability(capabilities, CAPABILITY_LOS_SATS) || hasCapability(capabilities, |
| CAPABILITY_EXCESS_PATH_LENGTH)) { |
| mCapabilities = capabilities; |
| return true; |
| } else { |
| Log.e(TAG, "Failed to set capabilities. Received capabilities 0x" |
| + Integer.toHexString(capabilities) + " does not contain the mandatory " |
| + "LOS_SATS or the EXCESS_PATH_LENGTH capability."); |
| return false; |
| } |
| } |
| |
| /** |
| * Returns the measurement corrections specific capabilities of the GNSS HAL implementation. |
| */ |
| int getCapabilities() { |
| return mCapabilities; |
| } |
| |
| /** |
| * Returns the string representation of the GNSS measurement capabilities. |
| */ |
| String toStringCapabilities() { |
| final int capabilities = getCapabilities(); |
| StringBuilder s = new StringBuilder(); |
| s.append("mCapabilities=0x").append(Integer.toHexString(capabilities)); |
| s.append(" ( "); |
| if (hasCapability(capabilities, CAPABILITY_LOS_SATS)) { |
| s.append("LOS_SATS "); |
| } |
| if (hasCapability(capabilities, CAPABILITY_EXCESS_PATH_LENGTH)) { |
| s.append("EXCESS_PATH_LENGTH "); |
| } |
| if (hasCapability(capabilities, CAPABILITY_REFLECTING_PLANE)) { |
| s.append("REFLECTING_PLANE "); |
| } |
| s.append(")"); |
| return s.toString(); |
| } |
| |
| private static boolean hasCapability(int halCapabilities, int capability) { |
| return (halCapabilities & capability) != 0; |
| } |
| |
| private boolean isCapabilitiesReceived() { |
| return mCapabilities != INVALID_CAPABILITIES; |
| } |
| |
| @VisibleForTesting |
| static class GnssMeasurementCorrectionsProviderNative { |
| public boolean isMeasurementCorrectionsSupported() { |
| return native_is_measurement_corrections_supported(); |
| } |
| |
| public boolean injectGnssMeasurementCorrections( |
| GnssMeasurementCorrections measurementCorrections) { |
| return native_inject_gnss_measurement_corrections(measurementCorrections); |
| } |
| } |
| |
| private static native boolean native_is_measurement_corrections_supported(); |
| |
| private static native boolean native_inject_gnss_measurement_corrections( |
| GnssMeasurementCorrections measurementCorrections); |
| } |