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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 RED_LED LEDS "red/"
#define GREEN_LED LEDS "green/"
#define BLUE_LED LEDS "blue/"
#define RGB_LED LEDS "rgb/"
#define BRIGHTNESS "brightness"
#define DUTY_PCTS "duty_pcts"
#define START_IDX "start_idx"
#define PAUSE_LO "pause_lo"
#define PAUSE_HI "pause_hi"
#define RAMP_STEP_MS "ramp_step_ms"
#define RGB_BLINK "rgb_blink"
/*
* 8 duty percent steps.
*/
#define RAMP_STEPS 8
/*
* Each step will stay on for 50ms by default.
*/
#define RAMP_STEP_DURATION 50
/*
* Each value represents a duty percent (0 - 100) for the led pwm.
*/
static int32_t BRIGHTNESS_RAMP[RAMP_STEPS] = {0, 12, 25, 37, 50, 72, 85, 100};
/*
* 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 void handleBacklight(const LightState& state) {
uint32_t brightness = state.color & 0xFF;
set(LCD_LED BRIGHTNESS, brightness);
}
/*
* Scale each value of the brightness ramp according to the
* brightness of the color.
*/
static std::string getScaledRamp(uint32_t brightness) {
std::string ramp, pad;
for (auto const& step : BRIGHTNESS_RAMP) {
int32_t scaledStep = (step * brightness) / 0xFF;
ramp += pad + std::to_string(scaledStep);
pad = ",";
}
return ramp;
}
static void handleNotification(const LightState& state) {
uint32_t redBrightness, greenBrightness, blueBrightness, brightness;
/*
* Extract brightness from AARRGGBB.
*/
redBrightness = (state.color >> 16) & 0xFF;
greenBrightness = (state.color >> 8) & 0xFF;
blueBrightness = state.color & 0xFF;
brightness = (state.color >> 24) & 0xFF;
/*
* Scale RGB brightness if the Alpha brightness is not 0xFF.
*/
if (brightness != 0xFF) {
redBrightness = (redBrightness * brightness) / 0xFF;
greenBrightness = (greenBrightness * brightness) / 0xFF;
blueBrightness = (blueBrightness * brightness) / 0xFF;
}
/* Disable blinking. */
set(RGB_LED RGB_BLINK, 0);
if (state.flashMode == Flash::TIMED) {
/*
* If the flashOnMs duration is not long enough to fit ramping up
* and down at the default step duration, step duration is modified
* to fit.
*/
int32_t stepDuration = RAMP_STEP_DURATION;
int32_t pauseHi = state.flashOnMs - (stepDuration * RAMP_STEPS * 2);
int32_t pauseLo = state.flashOffMs;
if (pauseHi < 0) {
stepDuration = state.flashOnMs / (RAMP_STEPS * 2);
pauseHi = 0;
}
/* Red */
set(RED_LED START_IDX, 0 * RAMP_STEPS);
set(RED_LED DUTY_PCTS, getScaledRamp(redBrightness));
set(RED_LED PAUSE_LO, pauseLo);
set(RED_LED PAUSE_HI, pauseHi);
set(RED_LED RAMP_STEP_MS, stepDuration);
/* Green */
set(GREEN_LED START_IDX, 1 * RAMP_STEPS);
set(GREEN_LED DUTY_PCTS, getScaledRamp(greenBrightness));
set(GREEN_LED PAUSE_LO, pauseLo);
set(GREEN_LED PAUSE_HI, pauseHi);
set(GREEN_LED RAMP_STEP_MS, stepDuration);
/* Blue */
set(BLUE_LED START_IDX, 2 * RAMP_STEPS);
set(BLUE_LED DUTY_PCTS, getScaledRamp(blueBrightness));
set(BLUE_LED PAUSE_LO, pauseLo);
set(BLUE_LED PAUSE_HI, pauseHi);
set(BLUE_LED RAMP_STEP_MS, stepDuration);
/* Enable blinking. */
set(RGB_LED RGB_BLINK, 1);
} else {
set(RED_LED BRIGHTNESS, redBrightness);
set(GREEN_LED BRIGHTNESS, greenBrightness);
set(BLUE_LED BRIGHTNESS, blueBrightness);
}
}
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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