140 lines
3.5 KiB
C++
140 lines
3.5 KiB
C++
/*
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* Copyright (C) 2017 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 "android.hardware.light@2.0-service.berlna"
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#include <log/log.h>
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#include "Light.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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#define LEDS "/sys/class/leds/"
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#define LCD_LED LEDS "lcd-backlight/"
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#define CHARGING_LED LEDS "charging/"
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#define BRIGHTNESS "brightness"
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#define BREATH "breath"
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#define DELAY_OFF "delay_off"
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#define DELAY_ON "delay_on"
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/*
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* Write value to path and close file.
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*/
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static void set(std::string path, std::string value) {
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std::ofstream file(path);
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if (!file.is_open()) {
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ALOGE("failed to write %s to %s", value.c_str(), path.c_str());
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return;
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}
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file << value;
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}
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static void set(std::string path, int value) {
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set(path, std::to_string(value));
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}
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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)) + (150 * ((color >> 8) & 0xff)) +
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(29 * (color & 0xff))) >> 8;
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}
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static void handleBacklight(const LightState& state) {
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uint32_t brightness = rgbToBrightness(state);
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set(LCD_LED BRIGHTNESS, brightness);
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}
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static void handleNotification(const LightState& state) {
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uint32_t alpha, brightness;
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/*
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* Extract brightness from AARRGGBB.
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*/
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alpha = (state.color >> 24) & 0xFF;
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brightness = rgbToBrightness(state);
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/*
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* Scale brightness if the Alpha brightness is not 0xFF.
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*/
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if (alpha != 0xFF)
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brightness = (brightness * alpha) / 0xFF;
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/* Disable blinking. */
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set(CHARGING_LED BREATH, 0);
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if (state.flashMode == Flash::TIMED) {
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/* Set LED */
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set(CHARGING_LED DELAY_OFF, state.flashOffMs);
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set(CHARGING_LED DELAY_ON, state.flashOnMs);
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/* Enable blinking. */
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set(CHARGING_LED BREATH, 1);
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} else {
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set(CHARGING_LED BRIGHTNESS, brightness);
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}
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}
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static std::map<Type, std::function<void(const LightState&)>> lights = {
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{Type::BACKLIGHT, handleBacklight},
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{Type::BATTERY, handleNotification},
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{Type::NOTIFICATIONS, handleNotification},
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{Type::ATTENTION, handleNotification},
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};
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Light::Light() {}
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Return<Status> Light::setLight(Type type, const LightState& state) {
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auto it = lights.find(type);
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if (it == lights.end()) {
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return Status::LIGHT_NOT_SUPPORTED;
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}
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/*
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* Lock global mutex until light state is updated.
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*/
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std::lock_guard<std::mutex> lock(globalLock);
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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 : lights) types.push_back(light.first);
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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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