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diff --git a/common/action_code.h b/common/action_code.h
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+++ b/common/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/>.
+*/
+#ifndef ACTION_CODE_H
+#define ACTION_CODE_H
+
+/* 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     Key and Modifiers
+ *   r: Left/Right flag(Left:0, Right:1)
+ *
+ * ACT_MODS_TAP(001r):
+ * 0010|mods|0000 0000    Modifiers with OneShot
+ * 0010|mods|0000 00xx    (reserved)
+ * 0010|mods| keycode     Modifiers with Tap Key
+ *
+ *
+ * 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(0110): TODO: Not needed?
+ * 0101|xxxx| keycode     Mouse key
+ *
+ * 011x|xxxx xxxx xxxx    (reseved)
+ *
+ *
+ * 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(00:default layer, 01:press, 10:release, 11:both)
+ *
+ * 1001|xxxx|xxxx xxxx   (reserved)
+ * 1001|oopp|BBBB BBBB   8-bit Bitwise Operation???
+ *
+ * ACT_LAYER_TAP(101x):
+ * 101E|LLLL| keycode    Invert with tap key
+ * 101E|LLLL|1110 xxxx   Reserved(0xE0-EF)
+ * 101E|LLLL|1111 0000   Invert with tap toggle(0xF0)
+ * 101E|LLLL|1111 0001   On/Off
+ * 101E|LLLL|1111 0010   Off/On
+ * 101E|LLLL|1111 0011   Set/Clear
+ * 101E|LLLL|1111 xxxx   Reserved(0xF4-FF)
+ *   ELLLL: layer(0-31)
+ *
+ *
+ * Extensions(11xx)
+ * ----------------
+ * ACT_MACRO(1100):
+ * 1100|opt | id(8)      Macro play?
+ * 1100|1111| id(8)      Macro record?
+ *
+ * ACT_COMMAND(1110):
+ * 1110|opt | id(8)      Built-in Command exec
+ *
+ * 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,
+    /* Layer Actions */
+    ACT_LAYER           = 0b1000,
+    ACT_LAYER_TAP       = 0b1010,
+    ACT_LAYER_TAP1      = 0b1011,
+    /* Extensions */
+    ACT_MACRO           = 0b1100,
+    ACT_COMMAND         = 0b1110,
+    ACT_FUNCTION        = 0b1111
+};
+
+
+/* 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_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_command {
+        uint8_t  id     :8;
+        uint8_t  opt    :4;
+        uint8_t  kind   :4;
+    } command;
+    struct action_function {
+        uint8_t  id     :8;
+        uint8_t  opt    :4;
+        uint8_t  kind   :4;
+    } func;
+} action_t;
+
+
+/* action utility */
+#define ACTION_NO                       0
+#define ACTION_TRANSPARENT              1
+#define ACTION(kind, param)             ((kind)<<12 | (param))
+
+
+/*
+ * 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,
+};
+#define ACTION_KEY(key)                 ACTION(ACT_MODS, (key))
+#define ACTION_MODS(mods)               ACTION(ACT_MODS, (mods)<<8 | 0)
+#define ACTION_MODS_KEY(mods, key)      ACTION(ACT_MODS, (mods)<<8 | (key))
+#define ACTION_MODS_TAP_KEY(mods, key)  ACTION(ACT_MODS_TAP, (mods)<<8 | (key))
+#define ACTION_MODS_ONESHOT(mods)       ACTION(ACT_MODS_TAP, (mods)<<8 | MODS_ONESHOT)
+
+
+/*
+ * 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)
+
+
+
+/* 
+ * Layer Actions
+ */
+enum layer_param_on {
+    ON_PRESS    = 1,
+    ON_RELEASE  = 2,
+    ON_BOTH     = 3,
+};
+enum layer_param_bit_op {
+    OP_BIT_AND = 0,
+    OP_BIT_OR  = 1,
+    OP_BIT_XOR = 2,
+    OP_BIT_SET = 3,
+};
+enum layer_pram_tap_op {
+    OP_TAP_TOGGLE = 0xF0,
+    OP_ON_OFF,
+    OP_OFF_ON,
+    OP_SET_CLEAR,
+};
+#define ACTION_LAYER_BITOP(op, part, bits, on)      (ACT_LAYER<<12 | (op)<<10 | (on)<<8 | (part)<<5 | ((bits)&0x1f))
+#define ACTION_LAYER_TAP(layer, key)                (ACT_LAYER_TAP<<12 | (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)
+/* 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)
+
+
+/*
+ * Extensions
+ */
+/* 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))
+/* Command */
+#define ACTION_COMMAND(id, opt)         ACTION(ACT_COMMAND,  (opt)<<8 | (addr))
+/* 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))
+
+#endif /* ACTION_CODE_H */