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diff --git a/src/core/hle/service/hid/hid.h b/src/core/hle/service/hid/hid.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/kernel/kernel.h"
+#include "common/bit_field.h"
+
+namespace Service {
+namespace HID {
+
+// Handle to shared memory region designated to HID_User service
+extern Handle g_shared_mem;
+
+// Event handles
+extern Handle g_event_pad_or_touch_1;
+extern Handle g_event_pad_or_touch_2;
+extern Handle g_event_accelerometer;
+extern Handle g_event_gyroscope;
+extern Handle g_event_debug_pad;
+
+/**
+ * Structure of a Pad controller state.
+ */
+struct PadState {
+ union {
+ u32 hex;
+
+ BitField<0, 1, u32> a;
+ BitField<1, 1, u32> b;
+ BitField<2, 1, u32> select;
+ BitField<3, 1, u32> start;
+ BitField<4, 1, u32> right;
+ BitField<5, 1, u32> left;
+ BitField<6, 1, u32> up;
+ BitField<7, 1, u32> down;
+ BitField<8, 1, u32> r;
+ BitField<9, 1, u32> l;
+ BitField<10, 1, u32> x;
+ BitField<11, 1, u32> y;
+
+ BitField<28, 1, u32> circle_right;
+ BitField<29, 1, u32> circle_left;
+ BitField<30, 1, u32> circle_up;
+ BitField<31, 1, u32> circle_down;
+ };
+};
+
+/**
+ * Structure of a single entry in the PadData's Pad state history array.
+ */
+struct PadDataEntry {
+ PadState current_state;
+ PadState delta_additions;
+ PadState delta_removals;
+
+ s16 circle_pad_x;
+ s16 circle_pad_y;
+};
+
+/**
+ * Structure of all data related to the 3DS Pad.
+ */
+struct PadData {
+ s64 index_reset_ticks;
+ s64 index_reset_ticks_previous;
+ u32 index; // the index of the last updated Pad state history element
+
+ u32 pad1;
+ u32 pad2;
+
+ PadState current_state; // same as entries[index].current_state
+ u32 raw_circle_pad_data;
+
+ u32 pad3;
+
+ std::array<PadDataEntry, 8> entries; // Pad state history
+};
+
+// Pre-defined PadStates for single button presses
+const PadState PAD_NONE = {{0}};
+const PadState PAD_A = {{1u << 0}};
+const PadState PAD_B = {{1u << 1}};
+const PadState PAD_SELECT = {{1u << 2}};
+const PadState PAD_START = {{1u << 3}};
+const PadState PAD_RIGHT = {{1u << 4}};
+const PadState PAD_LEFT = {{1u << 5}};
+const PadState PAD_UP = {{1u << 6}};
+const PadState PAD_DOWN = {{1u << 7}};
+const PadState PAD_R = {{1u << 8}};
+const PadState PAD_L = {{1u << 9}};
+const PadState PAD_X = {{1u << 10}};
+const PadState PAD_Y = {{1u << 11}};
+const PadState PAD_CIRCLE_RIGHT = {{1u << 28}};
+const PadState PAD_CIRCLE_LEFT = {{1u << 29}};
+const PadState PAD_CIRCLE_UP = {{1u << 30}};
+const PadState PAD_CIRCLE_DOWN = {{1u << 31}};
+
+// Methods for updating the HID module's state
+void PadButtonPress(const PadState& pad_state);
+void PadButtonRelease(const PadState& pad_state);
+void PadUpdateComplete();
+
+void HIDInit();
+void HIDShutdown();
+
+}
+}