platform_hardware_interfaces/power/1.1/IPower.hal

/*
 * Copyright (C) 2016 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 android.hardware.power@1.1;

import android.hardware.power@1.0;

/**
 * Interface to collect subsystem level sleep information
 */
interface IPower extends android.hardware.power@1.0::IPower {

    /**
     * Subsystem-level sleep state stats:
     * Report cumulative info on the statistics on subsystem-level sleep states
     * since boot.
     *
     * @return subsystems supported on this device and their sleep states
     * @return retval SUCCESS on success or FILESYSTEM_ERROR on filesystem
     * nodes access error.
     */
    getSubsystemLowPowerStats()
            generates (vec<PowerStateSubsystem> subsystems, Status retval);

    /**
     * powerHintAsync() is called to pass hints on power requirements which
     * may result in adjustment of power/performance parameters of the
     * cpufreq governor and other controls.
     *
     * A particular platform may choose to ignore any hint.
     *
     * @param hint PowerHint which is passed
     * @param data contains additional information about the hint
     * and is described along with the comments for each of the hints.
     */
    oneway powerHintAsync(PowerHint hint, int32_t data);

};