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/*
* Copyright (C) 2017 The LineageOS 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 "LightService"
#include <log/log.h>
#include "Light.h"
#include <fstream>
namespace android {
namespace hardware {
namespace light {
namespace V2_0 {
namespace implementation {
#define LEDS "/sys/class/leds/"
#define LCD_LED LEDS "lcd-backlight/"
#define CHARGING_LED LEDS "charging/"
#define BRIGHTNESS "brightness"
#define BREATH "breath"
#define DELAY_OFF "delay_off"
#define DELAY_ON "delay_on"
/*
* Write value to path and close file.
*/
static void set(std::string path, std::string value) {
std::ofstream file(path);
if (!file.is_open()) {
ALOGE("failed to write %s to %s", value.c_str(), path.c_str());
return;
}
file << value;
}
static void set(std::string path, int value) {
set(path, std::to_string(value));
}
static uint32_t rgbToBrightness(const LightState& state) {
uint32_t color = state.color & 0x00ffffff;
return ((77 * ((color >> 16) & 0xff)) + (150 * ((color >> 8) & 0xff)) +
(29 * (color & 0xff))) >> 8;
}
static void handleBacklight(const LightState& state) {
uint32_t brightness = rgbToBrightness(state);
set(LCD_LED BRIGHTNESS, brightness);
}
static void handleNotification(const LightState& state) {
uint32_t alpha, brightness;
/*
* Extract brightness from AARRGGBB.
*/
alpha = (state.color >> 24) & 0xFF;
brightness = rgbToBrightness(state);
/*
* Scale brightness if the Alpha brightness is not 0xFF.
*/
if (alpha != 0xFF)
brightness = (brightness * alpha) / 0xFF;
/* Disable blinking. */
set(CHARGING_LED BREATH, 0);
if (state.flashMode == Flash::TIMED) {
/* Set LED */
set(CHARGING_LED DELAY_OFF, state.flashOffMs);
set(CHARGING_LED DELAY_ON, state.flashOnMs);
/* Enable blinking. */
set(CHARGING_LED BREATH, 1);
} else {
set(CHARGING_LED BRIGHTNESS, brightness);
}
}
static std::map<Type, std::function<void(const LightState&)>> lights = {
{Type::BACKLIGHT, handleBacklight},
{Type::BATTERY, handleNotification},
{Type::NOTIFICATIONS, handleNotification},
{Type::ATTENTION, handleNotification},
};
Light::Light() {}
Return<Status> Light::setLight(Type type, const LightState& state) {
auto it = lights.find(type);
if (it == lights.end()) {
return Status::LIGHT_NOT_SUPPORTED;
}
/*
* Lock global mutex until light state is updated.
*/
std::lock_guard<std::mutex> lock(globalLock);
it->second(state);
return Status::SUCCESS;
}
Return<void> Light::getSupportedTypes(getSupportedTypes_cb _hidl_cb) {
std::vector<Type> types;
for (auto const& light : lights) types.push_back(light.first);
_hidl_cb(types);
return Void();
}
} // namespace implementation
} // namespace V2_0
} // namespace light
} // namespace hardware
} // namespace android
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