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diff --git a/quantum/action_code.h b/quantum/action_code.h
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+/*
+Copyright 2013 Jun Wako <wakojun@gmail.com>
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#pragma once
+
+/** \brief Action codes
+ *
+ * 16bit code: action_kind(4bit) + action_parameter(12bit)
+ *
+ * Key Actions(00xx)
+ * -----------------
+ * ACT_MODS(000r):
+ * 000r|0000|0000 0000    No action code
+ * 000r|0000|0000 0001    Transparent code
+ * 000r|0000| keycode     Key
+ * 000r|mods|0000 0000    Modifiers
+ * 000r|mods| keycode     Modifiers+Key(Modified key)
+ *   r: Left/Right flag(Left:0, Right:1)
+ *
+ * ACT_MODS_TAP(001r):
+ * 001r|mods|0000 0000    Modifiers with OneShot
+ * 001r|mods|0000 0001    Modifiers with tap toggle
+ * 001r|mods|0000 00xx    (reserved)
+ * 001r|mods| keycode     Modifiers with Tap Key(Dual role)
+ *
+ * Other Keys(01xx)
+ * ----------------
+ * ACT_USAGE(0100): TODO: Not needed?
+ * 0100|00| usage(10)     System control(0x80) - General Desktop page(0x01)
+ * 0100|01| usage(10)     Consumer control(0x01) - Consumer page(0x0C)
+ * 0100|10| usage(10)     (reserved)
+ * 0100|11| usage(10)     (reserved)
+ *
+ * ACT_MOUSEKEY(0101): TODO: Merge these two actions to conserve space?
+ * 0101|xxxx| keycode     Mouse key
+ *
+ * ACT_SWAP_HANDS(0110):
+ * 0110|xxxx| keycode     Swap hands (keycode on tap, or options)
+ *
+ * 0111|xxxx xxxx xxxx    (reserved)
+ *
+ * Layer Actions(10xx)
+ * -------------------
+ * ACT_LAYER(1000):
+ * 1000|oo00|pppE BBBB   Default Layer Bitwise operation
+ *   oo:    operation(00:AND, 01:OR, 10:XOR, 11:SET)
+ *   ppp:   4-bit chunk part(0-7)
+ *   EBBBB: bits and extra bit
+ * 1000|ooee|pppE BBBB   Layer Bitwise Operation
+ *   oo:    operation(00:AND, 01:OR, 10:XOR, 11:SET)
+ *   ppp:   4-bit chunk part(0-7)
+ *   EBBBB: bits and extra bit
+ *   ee:    on event(01:press, 10:release, 11:both)
+ *
+ * ACT_LAYER_MODS(1001):
+ * 1001|LLLL| mods       Layer with modifiers held
+ *
+ * ACT_LAYER_TAP(101x):
+ * 101E|LLLL| keycode    On/Off with tap key    (0x00-DF)[TAP]
+ * 101E|LLLL|1110 mods   On/Off with modifiers  (0xE0-EF)[NOT TAP]
+ * 101E|LLLL|1111 0000   Invert with tap toggle (0xF0)   [TAP]
+ * 101E|LLLL|1111 0001   On/Off                 (0xF1)   [NOT TAP]
+ * 101E|LLLL|1111 0010   Off/On                 (0xF2)   [NOT TAP]
+ * 101E|LLLL|1111 0011   Set/Clear              (0xF3)   [NOT TAP]
+ * 101E|LLLL|1111 0100   One Shot Layer         (0xF4)   [TAP]
+ * 101E|LLLL|1111 xxxx   Reserved               (0xF5-FF)
+ *   ELLLL: layer 0-31(E: extra bit for layer 16-31)
+ *
+ * Extensions(11xx)
+ * ----------------
+ * ACT_MACRO(1100):
+ * 1100|opt | id(8)      Macro play?
+ * 1100|1111| id(8)      Macro record?
+ *
+ * 1101|xxxx xxxx xxxx   (reserved)
+ * 1110|xxxx xxxx xxxx   (reserved)
+ *
+ * ACT_FUNCTION(1111):
+ * 1111| address(12)     Function?
+ * 1111|opt | id(8)      Function?
+ */
+enum action_kind_id {
+    /* Key Actions */
+    ACT_MODS      = 0b0000,
+    ACT_LMODS     = 0b0000,
+    ACT_RMODS     = 0b0001,
+    ACT_MODS_TAP  = 0b0010,
+    ACT_LMODS_TAP = 0b0010,
+    ACT_RMODS_TAP = 0b0011,
+    /* Other Keys */
+    ACT_USAGE    = 0b0100,
+    ACT_MOUSEKEY = 0b0101,
+    /* One-hand Support */
+    ACT_SWAP_HANDS = 0b0110,
+    /* Layer Actions */
+    ACT_LAYER         = 0b1000,
+    ACT_LAYER_MODS    = 0b1001,
+    ACT_LAYER_TAP     = 0b1010, /* Layer  0-15 */
+    ACT_LAYER_TAP_EXT = 0b1011, /* Layer 16-31 */
+    /* Extensions */
+    ACT_MACRO    = 0b1100,
+    ACT_FUNCTION = 0b1111
+};
+
+/** \brief Action Code Struct
+ *
+ * NOTE:
+ * In avr-gcc bit field seems to be assigned from LSB(bit0) to MSB(bit15).
+ * AVR looks like a little endian in avr-gcc.
+ * Not portable across compiler/endianness?
+ *
+ * Byte order and bit order of 0x1234:
+ *   Big endian:                Little endian:
+ *   --------------------       --------------------
+ *   FEDC BA98  7654 3210       0123 4567  89AB CDEF
+ *   0001 0010  0011 0100       0010 1100  0100 1000
+ *     0x12       0x34            0x34       0x12
+ */
+typedef union {
+    uint16_t code;
+    struct action_kind {
+        uint16_t param : 12;
+        uint8_t  id : 4;
+    } kind;
+    struct action_key {
+        uint8_t code : 8;
+        uint8_t mods : 4;
+        uint8_t kind : 4;
+    } key;
+    struct action_layer_bitop {
+        uint8_t bits : 4;
+        uint8_t xbit : 1;
+        uint8_t part : 3;
+        uint8_t on : 2;
+        uint8_t op : 2;
+        uint8_t kind : 4;
+    } layer_bitop;
+    struct action_layer_mods {
+        uint8_t mods : 8;
+        uint8_t layer : 4;
+        uint8_t kind : 4;
+    } layer_mods;
+    struct action_layer_tap {
+        uint8_t code : 8;
+        uint8_t val : 5;
+        uint8_t kind : 3;
+    } layer_tap;
+    struct action_usage {
+        uint16_t code : 10;
+        uint8_t  page : 2;
+        uint8_t  kind : 4;
+    } usage;
+    struct action_function {
+        uint8_t id : 8;
+        uint8_t opt : 4;
+        uint8_t kind : 4;
+    } func;
+    struct action_swap {
+        uint8_t code : 8;
+        uint8_t opt : 4;
+        uint8_t kind : 4;
+    } swap;
+} action_t;
+
+/* action utility */
+#define ACTION_NO 0
+#define ACTION_TRANSPARENT 1
+#define ACTION(kind, param) ((kind) << 12 | (param))
+
+/** \brief Key Actions
+ *
+ * Mod bits:    43210
+ *   bit 0      ||||+- Control
+ *   bit 1      |||+-- Shift
+ *   bit 2      ||+--- Alt
+ *   bit 3      |+---- Gui
+ *   bit 4      +----- LR flag(Left:0, Right:1)
+ */
+enum mods_bit {
+    MOD_LCTL = 0x01,
+    MOD_LSFT = 0x02,
+    MOD_LALT = 0x04,
+    MOD_LGUI = 0x08,
+    MOD_RCTL = 0x11,
+    MOD_RSFT = 0x12,
+    MOD_RALT = 0x14,
+    MOD_RGUI = 0x18,
+};
+enum mods_codes {
+    MODS_ONESHOT    = 0x00,
+    MODS_TAP_TOGGLE = 0x01,
+};
+#define ACTION_KEY(key) ACTION(ACT_MODS, (key))
+#define ACTION_MODS(mods) ACTION(ACT_MODS, ((mods)&0x1f) << 8 | 0)
+#define ACTION_MODS_KEY(mods, key) ACTION(ACT_MODS, ((mods)&0x1f) << 8 | (key))
+#define ACTION_MODS_TAP_KEY(mods, key) ACTION(ACT_MODS_TAP, ((mods)&0x1f) << 8 | (key))
+#define ACTION_MODS_ONESHOT(mods) ACTION(ACT_MODS_TAP, ((mods)&0x1f) << 8 | MODS_ONESHOT)
+#define ACTION_MODS_TAP_TOGGLE(mods) ACTION(ACT_MODS_TAP, ((mods)&0x1f) << 8 | MODS_TAP_TOGGLE)
+
+/** \brief Other Keys
+ */
+enum usage_pages { PAGE_SYSTEM, PAGE_CONSUMER };
+#define ACTION_USAGE_SYSTEM(id) ACTION(ACT_USAGE, PAGE_SYSTEM << 10 | (id))
+#define ACTION_USAGE_CONSUMER(id) ACTION(ACT_USAGE, PAGE_CONSUMER << 10 | (id))
+#define ACTION_MOUSEKEY(key) ACTION(ACT_MOUSEKEY, key)
+
+/** \brief Layer Actions
+ */
+enum layer_param_on {
+    ON_PRESS   = 1,
+    ON_RELEASE = 2,
+    ON_BOTH    = 3,
+};
+
+/** \brief Layer Actions
+ */
+enum layer_param_bit_op {
+    OP_BIT_AND = 0,
+    OP_BIT_OR  = 1,
+    OP_BIT_XOR = 2,
+    OP_BIT_SET = 3,
+};
+
+/** \brief Layer Actions
+ */
+enum layer_param_tap_op {
+    OP_TAP_TOGGLE = 0xF0,
+    OP_ON_OFF,
+    OP_OFF_ON,
+    OP_SET_CLEAR,
+    OP_ONESHOT,
+};
+#define ACTION_LAYER_BITOP(op, part, bits, on) ACTION(ACT_LAYER, (op) << 10 | (on) << 8 | (part) << 5 | ((bits)&0x1f))
+#define ACTION_LAYER_TAP(layer, key) ACTION(ACT_LAYER_TAP, (layer) << 8 | (key))
+/* Default Layer */
+#define ACTION_DEFAULT_LAYER_SET(layer) ACTION_DEFAULT_LAYER_BIT_SET((layer) / 4, 1 << ((layer) % 4))
+/* Layer Operation */
+#define ACTION_LAYER_CLEAR(on) ACTION_LAYER_BIT_AND(0, 0, (on))
+#define ACTION_LAYER_MOMENTARY(layer) ACTION_LAYER_ON_OFF(layer)
+#define ACTION_LAYER_TOGGLE(layer) ACTION_LAYER_INVERT(layer, ON_RELEASE)
+#define ACTION_LAYER_INVERT(layer, on) ACTION_LAYER_BIT_XOR((layer) / 4, 1 << ((layer) % 4), (on))
+#define ACTION_LAYER_ON(layer, on) ACTION_LAYER_BIT_OR((layer) / 4, 1 << ((layer) % 4), (on))
+#define ACTION_LAYER_OFF(layer, on) ACTION_LAYER_BIT_AND((layer) / 4, ~(1 << ((layer) % 4)), (on))
+#define ACTION_LAYER_SET(layer, on) ACTION_LAYER_BIT_SET((layer) / 4, 1 << ((layer) % 4), (on))
+#define ACTION_LAYER_ON_OFF(layer) ACTION_LAYER_TAP((layer), OP_ON_OFF)
+#define ACTION_LAYER_OFF_ON(layer) ACTION_LAYER_TAP((layer), OP_OFF_ON)
+#define ACTION_LAYER_SET_CLEAR(layer) ACTION_LAYER_TAP((layer), OP_SET_CLEAR)
+#define ACTION_LAYER_ONESHOT(layer) ACTION_LAYER_TAP((layer), OP_ONESHOT)
+#define ACTION_LAYER_MODS(layer, mods) ACTION(ACT_LAYER_MODS, (layer) << 8 | (mods))
+/* With Tapping */
+#define ACTION_LAYER_TAP_KEY(layer, key) ACTION_LAYER_TAP((layer), (key))
+#define ACTION_LAYER_TAP_TOGGLE(layer) ACTION_LAYER_TAP((layer), OP_TAP_TOGGLE)
+/* Bitwise Operation */
+#define ACTION_LAYER_BIT_AND(part, bits, on) ACTION_LAYER_BITOP(OP_BIT_AND, (part), (bits), (on))
+#define ACTION_LAYER_BIT_OR(part, bits, on) ACTION_LAYER_BITOP(OP_BIT_OR, (part), (bits), (on))
+#define ACTION_LAYER_BIT_XOR(part, bits, on) ACTION_LAYER_BITOP(OP_BIT_XOR, (part), (bits), (on))
+#define ACTION_LAYER_BIT_SET(part, bits, on) ACTION_LAYER_BITOP(OP_BIT_SET, (part), (bits), (on))
+/* Default Layer Bitwise Operation */
+#define ACTION_DEFAULT_LAYER_BIT_AND(part, bits) ACTION_LAYER_BITOP(OP_BIT_AND, (part), (bits), 0)
+#define ACTION_DEFAULT_LAYER_BIT_OR(part, bits) ACTION_LAYER_BITOP(OP_BIT_OR, (part), (bits), 0)
+#define ACTION_DEFAULT_LAYER_BIT_XOR(part, bits) ACTION_LAYER_BITOP(OP_BIT_XOR, (part), (bits), 0)
+#define ACTION_DEFAULT_LAYER_BIT_SET(part, bits) ACTION_LAYER_BITOP(OP_BIT_SET, (part), (bits), 0)
+
+/* Macro */
+#define ACTION_MACRO(id) ACTION(ACT_MACRO, (id))
+#define ACTION_MACRO_TAP(id) ACTION(ACT_MACRO, FUNC_TAP << 8 | (id))
+#define ACTION_MACRO_OPT(id, opt) ACTION(ACT_MACRO, (opt) << 8 | (id))
+/* Function */
+enum function_opts {
+    FUNC_TAP = 0x8, /* indciates function is tappable */
+};
+#define ACTION_FUNCTION(id) ACTION(ACT_FUNCTION, (id))
+#define ACTION_FUNCTION_TAP(id) ACTION(ACT_FUNCTION, FUNC_TAP << 8 | (id))
+#define ACTION_FUNCTION_OPT(id, opt) ACTION(ACT_FUNCTION, (opt) << 8 | (id))
+/* OneHand Support */
+enum swap_hands_param_tap_op {
+    OP_SH_TOGGLE = 0xF0,
+    OP_SH_TAP_TOGGLE,
+    OP_SH_ON_OFF,
+    OP_SH_OFF_ON,
+    OP_SH_OFF,
+    OP_SH_ON,
+    OP_SH_ONESHOT,
+};
+
+#define ACTION_SWAP_HANDS() ACTION_SWAP_HANDS_ON_OFF()
+#define ACTION_SWAP_HANDS_TOGGLE() ACTION(ACT_SWAP_HANDS, OP_SH_TOGGLE)
+#define ACTION_SWAP_HANDS_TAP_TOGGLE() ACTION(ACT_SWAP_HANDS, OP_SH_TAP_TOGGLE)
+#define ACTION_SWAP_HANDS_ONESHOT() ACTION(ACT_SWAP_HANDS, OP_SH_ONESHOT)
+#define ACTION_SWAP_HANDS_TAP_KEY(key) ACTION(ACT_SWAP_HANDS, key)
+#define ACTION_SWAP_HANDS_ON_OFF() ACTION(ACT_SWAP_HANDS, OP_SH_ON_OFF)
+#define ACTION_SWAP_HANDS_OFF_ON() ACTION(ACT_SWAP_HANDS, OP_SH_OFF_ON)
+#define ACTION_SWAP_HANDS_ON() ACTION(ACT_SWAP_HANDS, OP_SH_ON)
+#define ACTION_SWAP_HANDS_OFF() ACTION(ACT_SWAP_HANDS, OP_SH_OFF)