hidl: Setup touchscreen gestures with Lineage touch HIDL HAL

This takes advantage of the touchscreen gesture nodes exposed by Oplus
touchscreen drivers.

Change-Id: I5a43b8f922a8d1c940e367d22d377b7161913d3a

hidl/touch/TouchscreenGesture.cpp

@@ -0,0 +1,76 @@
+/*
+ * 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 <android-base/file.h>
+#include <android-base/strings.h>
+
+#include <touch/oplus/TouchscreenGesture.h>
+#include "touch/oplus/TouchscreenGestureConfig.h"
+
+using ::android::base::ReadFileToString;
+using ::android::base::Trim;
+using ::android::base::WriteStringToFile;
+
+namespace {
+
+constexpr const char* kGestureEnableIndepPath = "/proc/touchpanel/double_tap_enable_indep";
+
+}  // anonymous namespace
+
+namespace vendor {
+namespace lineage {
+namespace touch {
+namespace V1_0 {
+namespace implementation {
+
+Return<void> TouchscreenGesture::getSupportedGestures(getSupportedGestures_cb resultCb) {
+    std::vector<Gesture> gestures;
+
+    for (const auto& [id, name] : kGestureNames) {
+        if (kSupportedGestures & (1 << id)) {
+            gestures.push_back({static_cast<int>(gestures.size()), name, kGestureStartKey + id});
+        }
+    }
+
+    resultCb(gestures);
+
+    return Void();
+}
+
+Return<bool> TouchscreenGesture::setGestureEnabled(const Gesture& gesture, bool enabled) {
+    std::string tmp;
+    int contents = 0;
+
+    if (ReadFileToString(kGestureEnableIndepPath, &tmp)) {
+        contents = std::stoi(Trim(tmp), nullptr, 16);
+    }
+
+    if (enabled) {
+        contents |= (1 << (gesture.keycode - kGestureStartKey));
+    } else {
+        contents &= ~(1 << (gesture.keycode - kGestureStartKey));
+    }
+
+    return WriteStringToFile(std::to_string(contents), kGestureEnableIndepPath, true);
+}
+
+}  // namespace implementation
+}  // namespace V1_0
+}  // namespace touch
+}  // namespace lineage
+}  // namespace vendor