305b81cdf5
* I2C address for the panel regulator driver depends on the device and DSI port the display is connected on. Add more backlight paths to support different hardware configurations. Also add path for legacy rpi_backlight driver to make testing easier.
97 lines
3.2 KiB
C++
97 lines
3.2 KiB
C++
/*
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* Copyright (C) 2019 The Android Open Source Project
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* Copyright (C) 2023 KonstaKANG
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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-service.rpi"
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#include "Lights.h"
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#include <android-base/file.h>
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#include <android-base/logging.h>
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using ::android::base::ReadFileToString;
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using ::android::base::WriteStringToFile;
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namespace aidl::android::hardware::light {
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static const uint32_t defaultMaxBrightness = 255;
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static const std::string backlightBasePath = "/sys/class/backlight/";
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static const std::string backlightPaths[] = {
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"10-0045",
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"11-0045",
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"rpi_backlight",
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};
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static const std::vector<HwLight> availableLights = {
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{.id = (int)LightType::BACKLIGHT, .type = LightType::BACKLIGHT, .ordinal = 0}
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};
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Lights::Lights() {
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maxBrightness = defaultMaxBrightness;
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for (auto &path : backlightPaths) {
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std::string backlightMaxBrightnessPath = backlightBasePath + path + "/max_brightness";
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if (!access(backlightMaxBrightnessPath.c_str(), R_OK)) {
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std::string maxBrightnessValue;
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if (ReadFileToString(backlightMaxBrightnessPath, &maxBrightnessValue)) {
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maxBrightness = std::stoi(maxBrightnessValue);
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LOG(INFO) << backlightMaxBrightnessPath << " = " << maxBrightnessValue;
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break;
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}
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}
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}
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}
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ndk::ScopedAStatus Lights::setLightState(int id, const HwLightState& state) {
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HwLight const& light = availableLights[id];
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std::string const brightness = std::to_string(rgbToScaledBrightness(state, maxBrightness));
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switch (light.type) {
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case LightType::BACKLIGHT:
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for (auto &path : backlightPaths) {
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std::string backlightBrightnessPath = backlightBasePath + path + "/brightness";
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if (!access(backlightBrightnessPath.c_str(), W_OK)) {
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WriteStringToFile(brightness, backlightBrightnessPath);
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break;
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}
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}
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break;
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default:
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return ndk::ScopedAStatus::fromExceptionCode(EX_UNSUPPORTED_OPERATION);
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}
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return ndk::ScopedAStatus::ok();
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}
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ndk::ScopedAStatus Lights::getLights(std::vector<HwLight>* lights) {
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for (auto i = availableLights.begin(); i != availableLights.end(); i++) {
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lights->push_back(*i);
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}
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return ndk::ScopedAStatus::ok();
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}
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uint32_t Lights::rgbToScaledBrightness(const HwLightState& state, uint32_t maxBrightness) {
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uint32_t color = state.color & 0x00ffffff;
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uint32_t brightness = ((77 * ((color >> 16) & 0xff)) + (150 * ((color >> 8) & 0xff)) +
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(29 * (color & 0xff))) >> 8;
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return brightness * maxBrightness / 0xff;
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}
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} // aidl::android::hardware::light
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