light/utils/main.cpp

/*
 * Copyright (C) 2017 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.
 */

#include <iostream>
#include <string>

#include <android-base/logging.h>
#include <android/hardware/light/2.0/ILight.h>

void error(const std::string& msg) {
    LOG(ERROR) << msg;
    std::cerr << msg << std::endl;
}

int main(int argc, char* argv[]) {
    using ::android::hardware::hidl_vec;
    using ::android::hardware::light::V2_0::Brightness;
    using ::android::hardware::light::V2_0::Flash;
    using ::android::hardware::light::V2_0::ILight;
    using ::android::hardware::light::V2_0::LightState;
    using ::android::hardware::light::V2_0::Status;
    using ::android::hardware::light::V2_0::Type;
    using ::android::sp;

    sp<ILight> service = ILight::getService();
    if (service == nullptr) {
        error("Could not retrieve light service.");
        return -1;
    }

    static LightState off = {
            .color = 0u,
            .flashMode = Flash::NONE,
            .brightnessMode = Brightness::USER,
    };

    if (argc > 2) {
        error("Usage: blank_screen [color]");
        return -1;
    }

    if (argc > 1) {
        char* col_ptr;
        unsigned int col_new;

        col_new = strtoul(argv[1], &col_ptr, 0);
        if (*col_ptr != '\0') {
            error("Failed to convert " + std::string(argv[1]) + " to number");
            return -1;
        }
        off.color = col_new;
    }

    service->getSupportedTypes([&](const hidl_vec<Type>& types) {
        for (Type type : types) {
            Status ret = service->setLight(type, off);
            if (ret != Status::SUCCESS) {
                error("Failed to shut off screen for type " +
                      std::to_string(static_cast<int>(type)));
            }
        }
    });

    return 0;
}