power-libperfmgr/disp-power/DisplayLowPower.cpp

/*
 * Copyright (C) 2020 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.
 */

#define LOG_TAG "android.hardware.power@-service.pixel-libperfmgr"

#include <errno.h>
#include <unistd.h>

#include <cutils/sockets.h>
#include <log/log.h>

#include "DisplayLowPower.h"

DisplayLowPower::DisplayLowPower() : mFossStatus(false) {}

void DisplayLowPower::Init() {
    ConnectPpsDaemon();
}

void DisplayLowPower::SetDisplayLowPower(bool enable) {
    SetFoss(enable);
}

void DisplayLowPower::ConnectPpsDaemon() {
    constexpr const char kPpsDaemon[] = "pps";

    mPpsSocket.reset(
            socket_local_client(kPpsDaemon, ANDROID_SOCKET_NAMESPACE_RESERVED, SOCK_STREAM));
    if (mPpsSocket.get() < 0) {
        ALOGW("Connecting to PPS daemon failed (%s)", strerror(errno));
    }
}

int DisplayLowPower::SendPpsCommand(const std::string_view cmd) {
    if (TEMP_FAILURE_RETRY(write(mPpsSocket.get(), cmd.data(), cmd.size())) < 0) {
        ALOGE("Failed to send pps command '%s' over socket (%s)", cmd.data(), strerror(errno));
        return -1;
    }

    return 0;
}

void DisplayLowPower::SetFoss(bool enable) {
    if (mPpsSocket.get() < 0 || mFossStatus == enable) {
        return;
    }

    ALOGI("%s foss", (enable) ? "Enable" : "Disable");

    std::string_view foss_cmd;
    if (enable) {
        foss_cmd = "foss:on";
    } else {
        foss_cmd = "foss:off";
    }

    if (!SendPpsCommand(foss_cmd)) {
        mFossStatus = enable;
    }
}