hidl/light/Light.cpp

/*
 * Copyright (C) 2019 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 "android.hardware.light@2.0-service.samsung"

#include <android-base/stringprintf.h>
#include <iomanip>

#include "Light.h"

#define COLOR_MASK 0x00ffffff
#define MAX_INPUT_BRIGHTNESS 255

using android::hardware::light::V2_0::LightState;
using android::hardware::light::V2_0::Status;
using android::hardware::light::V2_0::Type;

namespace android {
namespace hardware {
namespace light {
namespace V2_0 {
namespace implementation {

/*
 * Write value to path and close file.
 */
template <typename T>
static void set(const std::string& path, const T& value) {
    std::ofstream file(path);
    file << value << std::endl;
}

template <typename T>
static T get(const std::string& path, const T& def) {
    std::ifstream file(path);
    T result;

    file >> result;
    return file.fail() ? def : result;
}

Light::Light() {
    mLights.emplace(Type::BACKLIGHT,
                    std::bind(&Light::handleBacklight, this, std::placeholders::_1));
#ifdef BUTTON_BRIGHTNESS_NODE
    mLights.emplace(Type::BUTTONS, std::bind(&Light::handleButtons, this, std::placeholders::_1));
#endif
    mLights.emplace(Type::BATTERY, std::bind(&Light::handleBattery, this, std::placeholders::_1));
    mLights.emplace(Type::NOTIFICATIONS,
                    std::bind(&Light::handleNotifications, this, std::placeholders::_1));
    mLights.emplace(Type::ATTENTION,
                    std::bind(&Light::handleAttention, this, std::placeholders::_1));
}

Return<Status> Light::setLight(Type type, const LightState& state) {
    auto it = mLights.find(type);

    if (it == mLights.end()) {
        return Status::LIGHT_NOT_SUPPORTED;
    }

    /*
     * Lock global mutex until light state is updated.
     */
    std::lock_guard<std::mutex> lock(mLock);

    it->second(state);

    return Status::SUCCESS;
}

void Light::handleBacklight(const LightState& state) {
    uint32_t max_brightness = get(PANEL_MAX_BRIGHTNESS_NODE, MAX_INPUT_BRIGHTNESS);
    uint32_t brightness = rgbToBrightness(state);

    if (max_brightness != MAX_INPUT_BRIGHTNESS) {
        brightness = brightness * max_brightness / MAX_INPUT_BRIGHTNESS;
    }

    set(PANEL_BRIGHTNESS_NODE, brightness);
}

#ifdef BUTTON_BRIGHTNESS_NODE
void Light::handleButtons(const LightState& state) {
#ifdef VAR_BUTTON_BRIGHTNESS
    uint32_t brightness = rgbToBrightness(state);
#else
    uint32_t brightness = (state.color & COLOR_MASK) ? 1 : 0;
#endif

    set(BUTTON_BRIGHTNESS_NODE, brightness);
}
#endif

void Light::handleBattery(const LightState& state) {
    mBatteryState = state;
    setNotificationLED();
}

void Light::handleNotifications(const LightState& state) {
    mNotificationState = state;
    setNotificationLED();
}

void Light::handleAttention(const LightState& state) {
    mAttentionState = state;
    setNotificationLED();
}

void Light::setNotificationLED() {
    int32_t adjusted_brightness = MAX_INPUT_BRIGHTNESS;
    LightState state;
#ifdef LED_BLN_NODE
    bool bln = false;
#endif

    if (mNotificationState.color & COLOR_MASK) {
        adjusted_brightness = LED_BRIGHTNESS_NOTIFICATION;
        state = mNotificationState;
#ifdef LED_BLN_NODE
        bln = true;
#endif
    } else if (mAttentionState.color & COLOR_MASK) {
        adjusted_brightness = LED_BRIGHTNESS_ATTENTION;
        state = mAttentionState;
        if (state.flashMode == Flash::HARDWARE) {
            if (state.flashOnMs > 0 && state.flashOffMs == 0) state.flashMode = Flash::NONE;
            state.color = 0x000000ff;
        }
        if (state.flashMode == Flash::NONE) {
            state.color = 0;
        }
    } else if (mBatteryState.color & COLOR_MASK) {
        adjusted_brightness = LED_BRIGHTNESS_BATTERY;
        state = mBatteryState;
    } else {
        set(LED_BLINK_NODE, "0x00000000 0 0");
        return;
    }

    if (state.flashMode == Flash::NONE) {
        state.flashOnMs = 0;
        state.flashOffMs = 0;
    }

    state.color = calibrateColor(state.color & COLOR_MASK, adjusted_brightness);
    set(LED_BLINK_NODE, android::base::StringPrintf("0x%08x %d %d", state.color, state.flashOnMs,
                                                    state.flashOffMs));

#ifdef LED_BLN_NODE
    if (bln) {
        set(LED_BLN_NODE, (state.color & COLOR_MASK) ? 1 : 0);
    }
#endif
}

Return<void> Light::getSupportedTypes(getSupportedTypes_cb _hidl_cb) {
    std::vector<Type> types;

    for (auto const& light : mLights) {
        types.push_back(light.first);
    }

    _hidl_cb(types);

    return Void();
}

uint32_t Light::rgbToBrightness(const LightState& state) {
    uint32_t color = state.color & COLOR_MASK;

    return ((77 * ((color >> 16) & 0xff)) + (150 * ((color >> 8) & 0xff)) + (29 * (color & 0xff))) >>
           8;
}

uint32_t Light::calibrateColor(uint32_t color, int32_t brightness) {
    uint32_t red = ((color >> 16) & 0xFF) * LED_ADJUSTMENT_R;
    uint32_t green = ((color >> 8) & 0xFF) * LED_ADJUSTMENT_G;
    uint32_t blue = (color & 0xFF) * LED_ADJUSTMENT_B;

    return (((red * brightness) / 255) << 16) + (((green * brightness) / 255) << 8) +
           ((blue * brightness) / 255);
}

}  // namespace implementation
}  // namespace V2_0
}  // namespace light
}  // namespace hardware
}  // namespace android