| /* |
| * Copyright (C) 2019-2021 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. |
| */ |
| |
| #include "livedisplay/sysfs/AdaptiveBacklight.h" |
| |
| #include <android-base/file.h> |
| #include <android-base/strings.h> |
| |
| using ::android::base::ReadFileToString; |
| using ::android::base::Trim; |
| using ::android::base::WriteStringToFile; |
| |
| namespace { |
| constexpr const char* kFileAcl = "/sys/class/graphics/fb0/acl"; |
| constexpr const char* kFileCabc = "/sys/class/graphics/fb0/cabc"; |
| } // anonymous namespace |
| |
| namespace vendor { |
| namespace lineage { |
| namespace livedisplay { |
| namespace V2_0 { |
| namespace sysfs { |
| |
| AdaptiveBacklight::AdaptiveBacklight() { |
| if (!access(kFileAcl, R_OK | W_OK)) { |
| file_ = kFileAcl; |
| } else if (!access(kFileCabc, R_OK | W_OK)) { |
| file_ = kFileCabc; |
| } else { |
| file_ = nullptr; |
| } |
| } |
| |
| bool AdaptiveBacklight::isSupported() { |
| return file_ != nullptr; |
| } |
| |
| // Methods from ::vendor::lineage::livedisplay::V2_0::IAdaptiveBacklight follow. |
| Return<bool> AdaptiveBacklight::isEnabled() { |
| std::string tmp; |
| int32_t contents = 0; |
| |
| if (ReadFileToString(file_, &tmp)) { |
| contents = std::stoi(Trim(tmp)); |
| } |
| |
| return contents > 0; |
| } |
| |
| Return<bool> AdaptiveBacklight::setEnabled(bool enabled) { |
| return WriteStringToFile(std::to_string(enabled), file_, true); |
| } |
| |
| } // namespace sysfs |
| } // namespace V2_0 |
| } // namespace livedisplay |
| } // namespace lineage |
| } // namespace vendor |