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diff --git a/src/core/hle/service/ptm/ptm.h b/src/core/hle/service/ptm/ptm.h
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+// Copyright 2015 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <array>
+#include "core/hle/result.h"
+
+namespace Service {
+namespace PTM {
+
+/// Charge levels used by PTM functions
+enum class ChargeLevels : u32 {
+    CriticalBattery    = 1,
+    LowBattery         = 2,
+    HalfFull           = 3,
+    MostlyFull         = 4,
+    CompletelyFull     = 5,
+};
+
+/** 
+ * Represents the gamecoin file structure in the SharedExtData archive
+ * More information in 3dbrew (http://www.3dbrew.org/wiki/Extdata#Shared_Extdata_0xf000000b_gamecoin.dat)
+ */
+struct GameCoin {
+    u32 magic; ///< Magic number: 0x4F00
+    u16 total_coins; ///< Total Play Coins 
+    u16 total_coins_on_date; ///< Total Play Coins obtained on the date stored below.
+    u32 step_count; ///< Total step count at the time a new Play Coin was obtained. 
+    u32 last_step_count; ///< Step count for the day the last Play Coin was obtained
+    u16 year;
+    u8 month;
+    u8 day;
+};
+
+/**
+ * Returns whether the battery is charging or not.
+ * It is unknown if GetAdapterState is the same as GetBatteryChargeState,
+ * it is likely to just be a duplicate function of GetBatteryChargeState
+ * that controls another part of the HW.
+ * @returns 1 if the battery is charging, and 0 otherwise.
+ */
+u32 GetAdapterState();
+
+/**
+ * Returns whether the 3DS's physical shell casing is open or closed
+ * @returns 1 if the shell is open, and 0 if otherwise
+ */
+u32 GetShellState();
+
+/**
+ * Get the current battery's charge level.
+ * @returns The battery's charge level.
+ */
+ChargeLevels GetBatteryLevel();
+
+/// Initialize the PTM service
+void PTMInit();
+
+/// Shutdown the PTM service
+void PTMShutdown();
+
+} // namespace PTM
+} // namespace Service