xref: /aosp_15_r20/hardware/interfaces/gnss/2.0/IGnssCallback.hal (revision 4d7e907c777eeecc4c5bd7cf640a754fac206ff7)

/*
 * Copyright (C) 2018 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 [email protected];

import @1.0::IGnssCallback;
import @1.1::IGnssCallback;
import GnssLocation;
import GnssConstellationType;

/**
 * This interface is required for the HAL to communicate certain information
 * like status and location info back to the platform, the platform implements
 * the interfaces and passes a handle to the HAL.
 */
interface IGnssCallback extends @1.1::IGnssCallback {

    /** Flags for the gnssSetCapabilities callback. */
    @export(name="", value_prefix="GPS_CAPABILITY_")
    enum Capabilities : @1.0::IGnssCallback.Capabilities {
        /** GNSS supports low power mode */
        LOW_POWER_MODE                          = 1 << 8,
        /** GNSS supports blacklisting satellites */
        SATELLITE_BLACKLIST                     = 1 << 9,
        /** GNSS supports measurement corrections */
        MEASUREMENT_CORRECTIONS                 = 1 << 10
    };

    /**
     * Callback to inform framework of the GNSS HAL implementation's capabilities.
     *
     * @param capabilities Capability parameter is a bit field of the Capabilities enum.
     */
    gnssSetCapabilitiesCb_2_0(bitfield<Capabilities> capabilities);

   /**
     * Called when a GNSS location is available.
     *
     * @param location Location information from HAL.
     */
    gnssLocationCb_2_0(GnssLocation location);

    /**
     * Callback for requesting Location.
     *
     * HAL implementation must call this when it wants the framework to provide locations to assist
     * with GNSS HAL operation, for example, to assist with time to first fix, error recovery, or to
     * supplement GNSS location for other clients of the GNSS HAL.
     *
     * If a request is made with independentFromGnss set to true, the framework must avoid
     * providing locations derived from GNSS locations (such as "fused" location), to help improve
     * information independence for situations such as error recovery.
     *
     * In response to this method call, GNSS HAL can expect zero, one, or more calls to
     * IGnss::injectLocation or IGnss::injectBestLocation, dependent on availability of location
     * from other sources, which may happen at some arbitrary delay. Generally speaking, HAL
     * implementations must be able to handle calls to IGnss::injectLocation or
     * IGnss::injectBestLocation at any time.
     *
     * @param independentFromGnss True if requesting a location that is independent from GNSS.
     * @param isUserEmergency True if the location request is for delivery of this location to an
     *        emergency services endpoint, during a user-initiated emergency session (e.g.
     *        during-call to E911, or up to 5 minutes after end-of-call or text to E911).
     */
    gnssRequestLocationCb_2_0(bool independentFromGnss, bool isUserEmergency);

    /** Extends a GnssSvInfo, replacing the GnssConstellationType. */
    struct GnssSvInfo {
        /**
         * GNSS satellite information for a single satellite and frequency.
         *
         * In this version of the HAL, the field 'constellation' in the v1_0 struct is deprecated,
         * and is no longer used by the framework. The constellation type is instead reported in
         * @2.0::IGnssCallback.GnssSvInfo.constellation.
         */
        @1.0::IGnssCallback.GnssSvInfo v1_0;

        /** Defines the constellation of the given SV. */
        GnssConstellationType constellation;
    };

    /**
     * Callback for the HAL to pass a vector of GnssSvInfo back to the client.
     *
     * @param svInfo SV status information from HAL.
     */
    gnssSvStatusCb_2_0(vec<GnssSvInfo> svInfoList);
};