LG8n: power: Bring back power-mode.cpp

Signed-off-by: Shirayuki39 <lorddemecrius83@proton.me>

power/power-mode.cpp

@@ -0,0 +1,47 @@
+/*
+ * Copyright (C) 2021 The LineageOS Project
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <aidl/android/hardware/power/BnPower.h>
+#include <android-base/file.h>
+#include <android-base/logging.h>
+#include <sys/ioctl.h>
+
+namespace aidl {
+namespace android {
+namespace hardware {
+namespace power {
+namespace impl {
+namespace mediatek {
+
+using ::aidl::android::hardware::power::Mode;
+
+bool isDeviceSpecificModeSupported(Mode type, bool* _aidl_return) {
+    switch (type) {
+        case Mode::DOUBLE_TAP_TO_WAKE:
+            *_aidl_return = true;
+            return true;
+        default:
+            return false;
+    }
+}
+
+bool setDeviceSpecificMode(Mode type, bool enabled) {
+    switch (type) {
+        case Mode::DOUBLE_TAP_TO_WAKE: {
+            ::android::base::WriteStringToFile(enabled ? "cc1" : "cc2", TAP_TO_WAKE_NODE, true);
+            return true;
+        }
+        default:
+            return false;
+    }
+}
+
+}  // namespace mediatek
+}  // namespace impl
+}  // namespace power
+}  // namespace hardware
+}  // namespace android
+}  // namespace aidl