sm8450-common: Add power HAL extension and use xiaomi-touch to handle dt2w

Change-Id: I5c65e0df255853eb2b3018a27ceb807c111bc4df

power/power-mode.cpp

@@ -0,0 +1,55 @@
+/*
+ * 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>
+
+#define SET_CUR_VALUE 0
+#define TOUCH_DOUBLETAP_MODE 14
+#define TOUCH_MAGIC 't'
+#define TOUCH_IOC_SETMODE _IO(TOUCH_MAGIC, SET_CUR_VALUE)
+#define TOUCH_DEV_PATH "/dev/xiaomi-touch"
+#define TOUCH_ID 0
+
+namespace aidl {
+namespace android {
+namespace hardware {
+namespace power {
+namespace impl {
+
+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: {
+            int fd = open(TOUCH_DEV_PATH, O_RDWR);
+            int arg[3] = {TOUCH_ID, TOUCH_DOUBLETAP_MODE, enabled ? 1 : 0};
+            ioctl(fd, TOUCH_IOC_SETMODE, &arg);
+            close(fd);
+            return true;
+        }
+        default:
+            return false;
+    }
+}
+
+}  // namespace impl
+}  // namespace power
+}  // namespace hardware
+}  // namespace android
+}  // namespace aidl