touch: Implement opt-in IHighTouchPollingRate interface

Change-Id: Ia0b45caa224cc9fea38f9b4efacce3287f888baa

hidl/touch/HighTouchPollingRate.cpp

@@ -0,0 +1,51 @@
+/*
+ * Copyright (C) 2022 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 "vendor.lineage.touch@1.0-service.oplus"
+
+#include "HighTouchPollingRate.h"
+
+#include <android-base/file.h>
+
+using ::android::base::ReadFileToString;
+using ::android::base::WriteStringToFile;
+
+namespace {
+
+constexpr const char* kGameSwitchEnablePath = "/proc/touchpanel/game_switch_enable";
+
+}  // anonymous namespace
+
+namespace vendor {
+namespace lineage {
+namespace touch {
+namespace V1_0 {
+namespace implementation {
+
+Return<bool> HighTouchPollingRate::isEnabled() {
+    std::string value;
+    return ReadFileToString(kGameSwitchEnablePath, &value) && value[0] != '0';
+}
+
+Return<bool> HighTouchPollingRate::setEnabled(bool enabled) {
+    return WriteStringToFile(enabled ? "1" : "0", kGameSwitchEnablePath, true);
+}
+
+}  // namespace implementation
+}  // namespace V1_0
+}  // namespace touch
+}  // namespace lineage
+}  // namespace vendor