110 lines
3 KiB
C++
110 lines
3 KiB
C++
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/*
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* Copyright (C) 2018 The LineageOS Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#define LOG_TAG "LightsService"
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#include "Light.h"
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#include <android-base/logging.h>
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#include <android-base/stringprintf.h>
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#include <fstream>
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namespace android {
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namespace hardware {
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namespace light {
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namespace V2_0 {
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namespace implementation {
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/*
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* Write value to path and close file.
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*/
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template <typename T>
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static void set(const std::string& path, const T& value) {
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std::ofstream file(path);
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file << value;
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}
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/*
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* Read from path and close file.
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* Return def in case of any failure.
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*/
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template <typename T>
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static T get(const std::string& path, const T& def) {
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std::ifstream file(path);
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T result;
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file >> result;
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return file.fail() ? def : result;
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}
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static constexpr int kDefaultMaxBrightness = 255;
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static uint32_t rgbToBrightness(const LightState& state) {
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uint32_t color = state.color & 0x00ffffff;
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return ((77 * ((color >> 16) & 0xff))
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+ (150 * ((color >> 8) & 0xff))
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+ (29 * (color & 0xff))) >> 8;
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}
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Light::Light() {
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mLights.emplace(Type::BACKLIGHT, std::bind(&Light::handleBacklight, this, std::placeholders::_1));
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}
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void Light::handleBacklight(const LightState& state) {
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int maxBrightness = get("/sys/class/backlight/panel0-backlight/max_brightness", -1);
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if (maxBrightness < 0) {
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maxBrightness = kDefaultMaxBrightness;
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}
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uint32_t sentBrightness = rgbToBrightness(state);
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uint32_t brightness = sentBrightness * maxBrightness / kDefaultMaxBrightness;
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LOG(DEBUG) << "Writing backlight brightness " << brightness
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<< " (orig " << sentBrightness << ")";
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set("/sys/class/backlight/panel0-backlight/brightness", brightness);
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}
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Return<Status> Light::setLight(Type type, const LightState& state) {
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auto it = mLights.find(type);
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if (it == mLights.end()) {
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return Status::LIGHT_NOT_SUPPORTED;
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}
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// Lock global mutex until light state is updated.
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std::lock_guard<std::mutex> lock(mLock);
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it->second(state);
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return Status::SUCCESS;
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}
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Return<void> Light::getSupportedTypes(getSupportedTypes_cb _hidl_cb) {
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std::vector<Type> types;
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for (auto const& light : mLights) {
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types.push_back(light.first);
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}
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_hidl_cb(types);
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return Void();
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}
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} // namespace implementation
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} // namespace V2_0
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} // namespace light
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} // namespace hardware
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} // namespace android
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