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/*
* Copyright (C) 2018-2020 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>
#define NOTIFICATION_LED "/sys/class/leds/left/"
#define BREATH "breath"
#define BRIGHTNESS "brightness"
#define MAX_BRIGHTNESS "max_brightness"
namespace {
/*
* Write value to path and close file.
*/
static void set(std::string path, std::string value) {
std::ofstream file(path);
if (!file.is_open()) {
ALOGW("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));
}
/*
* Read max brightness from path and close file.
*/
static int getMaxBrightness(std::string path) {
std::ifstream file(path);
int value;
if (!file.is_open()) {
ALOGW("failed to read from %s", path.c_str());
return 0;
}
file >> value;
return value;
}
static uint32_t getBrightness(const LightState& state) {
uint32_t alpha, red, green, blue;
/*
* Extract brightness from AARRGGBB.
*/
alpha = (state.color >> 24) & 0xFF;
red = (state.color >> 16) & 0xFF;
green = (state.color >> 8) & 0xFF;
blue = state.color & 0xFF;
/*
* Scale RGB brightness using Alpha brightness.
*/
red = red * alpha / 0xFF;
green = green * alpha / 0xFF;
blue = blue * alpha / 0xFF;
return (77 * red + 150 * green + 29 * blue) >> 8;
}
static inline uint32_t scaleBrightness(uint32_t brightness, uint32_t maxBrightness) {
if (brightness == 0) {
return 0;
}
return (brightness - 1) * (maxBrightness - 1) / (0xFF - 1) + 1;
}
static inline uint32_t getScaledBrightness(const LightState& state, uint32_t maxBrightness) {
return scaleBrightness(getBrightness(state), maxBrightness);
}
static void handleNotification(const LightState& state) {
uint32_t notificationBrightness = getScaledBrightness(state, getMaxBrightness(NOTIFICATION_LED MAX_BRIGHTNESS));
/* Disable breathing or blinking */
set(NOTIFICATION_LED BREATH, 0);
set(NOTIFICATION_LED BRIGHTNESS, 0);
if (!notificationBrightness) {
return;
}
switch (state.flashMode) {
case Flash::HARDWARE:
case Flash::TIMED:
/* Breathing */
set(NOTIFICATION_LED BREATH, 1);
break;
case Flash::NONE:
default:
set(NOTIFICATION_LED BRIGHTNESS, notificationBrightness);
}
}
static inline bool isStateLit(const LightState& state) {
return state.color & 0x00ffffff;
}
static inline bool isStateEqual(const LightState& first, const LightState& second) {
if (first.color == second.color && first.flashMode == second.flashMode &&
first.flashOnMs == second.flashOnMs &&
first.flashOffMs == second.flashOffMs &&
first.brightnessMode == second.brightnessMode) {
return true;
}
return false;
}
/* Keep sorted in the order of importance. */
static std::vector<LightBackend> backends = {
{ Type::ATTENTION, handleNotification },
{ Type::NOTIFICATIONS, handleNotification },
{ Type::BATTERY, handleNotification },
};
static LightStateHandler findHandler(Type type) {
for (const LightBackend& backend : backends) {
if (backend.type == type) {
return backend.handler;
}
}
return nullptr;
}
static LightState findLitState(LightStateHandler handler) {
LightState emptyState;
for (const LightBackend& backend : backends) {
if (backend.handler == handler) {
if (isStateLit(backend.state)) {
return backend.state;
}
emptyState = backend.state;
}
}
return emptyState;
}
static void updateState(Type type, const LightState& state) {
for (LightBackend& backend : backends) {
if (backend.type == type) {
backend.state = state;
}
}
}
} // anonymous namespace
namespace android {
namespace hardware {
namespace light {
namespace V2_0 {
namespace implementation {
Return<Status> Light::setLight(Type type, const LightState& state) {
/* Lock global mutex until light state is updated. */
std::lock_guard<std::mutex> lock(globalLock);
LightStateHandler handler = findHandler(type);
if (!handler) {
/* If no handler has been found, then the type is not supported. */
return Status::LIGHT_NOT_SUPPORTED;
}
/* Find the old state of the current handler. */
LightState oldState = findLitState(handler);
/* Update the cached state value for the current type. */
updateState(type, state);
/* Find the new state of the current handler. */
LightState newState = findLitState(handler);
if (isStateEqual(oldState, newState)) {
return Status::SUCCESS;
}
handler(newState);
return Status::SUCCESS;
}
Return<void> Light::getSupportedTypes(getSupportedTypes_cb _hidl_cb) {
std::vector<Type> types;
for (const LightBackend& backend : backends) {
types.push_back(backend.type);
}
_hidl_cb(types);
return Void();
}
} // namespace implementation
} // namespace V2_0
} // namespace light
} // namespace hardware
} // namespace android
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