sm8250-common: Import custom livedisplay

livedisplay/AdaptiveBacklight.cpp

@@ -0,0 +1,77 @@
+/*
+ * Copyright (C) 2019-2020 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.
+ */
+
+#include "AdaptiveBacklight.h"
+
+#include <android-base/file.h>
+#include <android-base/properties.h>
+#include <android-base/strings.h>
+
+using ::android::base::GetBoolProperty;
+using ::android::base::ReadFileToString;
+using ::android::base::Trim;
+using ::android::base::WriteStringToFile;
+
+namespace {
+    constexpr const char *kFileAcl = "/sys/devices/platform/soc/soc:qcom,dsi-display-primary/dsi_display_acl";
+    constexpr const char *kFileCabc = "/sys/devices/platform/soc/soc:qcom,dsi-display-primary/dsi_display_cabc";
+    constexpr const char *kFossProperty = "ro.vendor.display.foss";
+}  // 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() {
+    if (GetBoolProperty(kFossProperty, false) || file_ == nullptr) {
+        return false;
+    }
+    return true;
+}
+
+// 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