5 files changed, 39 insertions, 20 deletions

diff --git a/README.md b/README.md
index 072de0a38..b9238922b 100644
--- a/README.md
+++ b/README.md
@@ -7,7 +7,7 @@ Source code is available here: <http://github.com/tmk/tmk_keyboard>
 
 Features
 --------
-* Multi-layer keymap    - Multiple keyboard layouts with layer switching.
+* Multi-layer Keymap  - Multiple keyboard layouts with layer switching.
 * Mouse key           - Mouse control with keyboard
 * System Control Key  - Power Down, Sleep, Wake Up and USB Remote Wake up
 * Media Control Key   - Volume Down/Up, Mute, Next/Prev track, Play, Stop and etc
@@ -283,8 +283,11 @@ See `common/keycode.h`. Keycode is 8bit internal code to inidicate action perfor
 
  ***In `KEYMAP` definition you need to omit prefix part `KC_` of keycode to keep keymap compact.*** For example, just use `A` instead you place `KC_A` in `KEYMAP`. Some keycodes has 4-letter short name in addition to descriptive name, you'll prefer short one in `KEYMAP`.
 
-#### 1.1 Normal key
+#### 1.0 Other key
 - `KC_NO` for no aciton
+- `KC_TRNS` for transparent layer
+
+#### 1.1 Normal key
 - `KC_A` to `KC_Z`, `KC_1` to `KC_0` for alpha numeric key
 - `KC_MINS`, `KC_EQL`, `KC_GRV`, `KC_RBRC`, `KC_LBRC`, `KC_COMM`, `KC_DOT`, `KC_BSLS`, `KC_SLSH`, `KC_SCLN`, `KC_QUOT`
 - `KC_ESC`, `KC_TAB`, `KC_SPC`, `KC_BSPC`, `KC_ENT`, `KC_DEL`, `KC_INS`
@@ -301,7 +304,7 @@ There are 8 modifiers which has discrimination between left and right.
 - `KC_LGUI` and `KC_RGUI` for Windows key or Command key in Mac
 
 #### 1.3 Fn key
- **`KC_FNnn`** are `Fn` keys which not given any action at the beginning unlike most of keycodes has its own action. To use these keys in `KEYMAP` you need to assign action you want at first. Action of `Fn` is defined in `fn_actions[]` and index of the array is identical with number part of `KC_FNnn`. Thus `KC_FN0` designates action defined in first element of the array. ***32 `Fn` keys can be defined at most.***
+`KC_FNnn` are `Fn` keys which not given any action at the beginning unlike most of keycodes has its own action. To use these keys in `KEYMAP` you need to assign action you want at first. Action of `Fn` is defined in `fn_actions[]` and index of the array is identical with number part of `KC_FNnn`. Thus `KC_FN0` designates action defined in first element of the array. ***32 `Fn` keys can be defined at most.***
 
 #### 1.4 Mousekey
 - `KC_MS_U`, `KC_MS_D`, `KC_MS_L`, `KC_MS_R` for mouse cursor
@@ -359,7 +362,7 @@ This sets `default layer` into `current layer`. With this action you can return
     ACTION_LAYER_SET_TAP_KEY(layer, key)
     ACTION_LAYER_SET_TAP_TOGGLE(layer)
 
-`Layer Bit` action XOR bits with `current layer`. `Layer Bit` action can take 0 to 8 as argument. 
+`Layer Bit` action XOR given bits with `current layer`. `Layer Bit` action can take 0 to 15 as argument. 
 
     ACTION_LAYER_BIT(bits)
     ACTION_LAYER_BIT_TOGGLE(bits)
@@ -659,4 +662,4 @@ Files & Directories
 License
 -------
 Under `GPL` 2 or later. Some protocol files are under `Modified BSD License`.
-LUFA and PJRC stack have their own license respectively.
+LUFA, PJRC and V-USB stack have their own license respectively.
diff --git a/common/action.c b/common/action.c
index aadf5e16e..710300eb3 100644
--- a/common/action.c
+++ b/common/action.c
@@ -201,6 +201,19 @@ void action_exec(keyevent_t event)
     }
 }
 
+static action_t get_action(key_t key)
+{
+    action_t action = keymap_get_action(current_layer, key.pos.row, key.pos.col);
+
+    /* Transparently use default layer */
+    if (action.code == ACTION_TRANSPARENT) {
+        // TODO: layer stacking
+        action = keymap_get_action(default_layer, key.pos.row, key.pos.col);
+        debug("TRNASPARENT: "); debug_hex16(action.code); debug("\n");
+    }
+    return action;
+}
+
 static void process_action(keyrecord_t *record)
 {
     keyevent_t event = record->event;
@@ -208,8 +221,7 @@ static void process_action(keyrecord_t *record)
 
     if (IS_NOEVENT(event)) { return; }
 
-    action_t action = keymap_get_action(current_layer, event.key.pos.row, event.key.pos.col);
-    //debug("action: "); debug_hex16(action.code); if (event.pressed) debug("d\n"); else debug("u\n");
+    action_t action = get_action(event.key);
     debug("ACTION: "); debug_action(action); debug("\n");
 
     switch (action.kind.id) {
@@ -809,7 +821,8 @@ void layer_switch(uint8_t new_layer)
 
 bool is_tap_key(key_t key)
 {
-    action_t action = keymap_get_action(current_layer, key.pos.row, key.pos.col);
+    action_t action = get_action(key);
+
     switch (action.kind.id) {
         case ACT_LMODS_TAP:
         case ACT_RMODS_TAP:
diff --git a/common/action.h b/common/action.h
index ac44b1a79..bb44049ad 100644
--- a/common/action.h
+++ b/common/action.h
@@ -106,12 +106,14 @@ Keyboard Keys
 -------------
 ACT_LMODS(0000):
 0000|0000|000000|00    No action
+0000|0000|000000|01    Transparent
 0000|0000| keycode     Key
 0000|mods|000000|00    Left mods
 0000|mods| keycode     Key & Left mods
 
 ACT_RMODS(0001):
-0001|0000|000000|00    No action
+0001|0000|000000|00    No action(not used)
+0001|0000|000000|01    Transparent(not used)
 0001|0000| keycode     Key(no used)
 0001|mods|000000|00    Right mods
 0001|mods| keycode     Key & Right mods
@@ -207,6 +209,7 @@ enum action_kind_id {
 
 /* action utility */
 #define ACTION_NO                       0
+#define ACTION_TRANSPARENT              1
 #define ACTION(kind, param)             ((kind)<<12 | (param))
 #define MODS4(mods)                     (((mods)>>4 | (mods)) & 0x0F)
 
diff --git a/common/keycode.h b/common/keycode.h
index 4f57a5887..364679994 100644
--- a/common/keycode.h
+++ b/common/keycode.h
@@ -28,6 +28,10 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #define IS_KEY(code)             (KC_A         <= (code) && (code) <= KC_EXSEL)
 #define IS_MOD(code)             (KC_LCTRL     <= (code) && (code) <= KC_RGUI)
 
+
+#define IS_SPECIAL(code)         ((0xA5 <= (code) && (code) <= 0xDF) || (0xE8 <= (code) && (code) <= 0xFF))
+#define IS_SYSTEM(code)          (KC_POWER     <= (code) && (code) <= KC_WAKE)
+#define IS_CONSUMER(code)        (KC_MUTE      <= (code) && (code) <= KC_WFAV)
 #define IS_FN(code)              (KC_FN0       <= (code) && (code) <= KC_FN31)
 #define IS_MOUSEKEY(code)        (KC_MS_UP     <= (code) && (code) <= KC_MS_ACCEL2)
 #define IS_MOUSEKEY_MOVE(code)   (KC_MS_UP     <= (code) && (code) <= KC_MS_RIGHT)
@@ -35,10 +39,6 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #define IS_MOUSEKEY_WHEEL(code)  (KC_MS_WH_UP  <= (code) && (code) <= KC_MS_WH_RIGHT)
 #define IS_MOUSEKEY_ACCEL(code)  (KC_MS_ACCEL0 <= (code) && (code) <= KC_MS_ACCEL2)
 
-#define IS_SPECIAL(code)         ((0xA5 <= (code) && (code) <= 0xDF) || (0xE8 <= (code) && (code) <= 0xFF))
-#define IS_CONSUMER(code)        (KC_MUTE      <= (code) && (code) <= KC_WFAV)
-#define IS_SYSTEM(code)          (KC_POWER     <= (code) && (code) <= KC_WAKE)
-
 #define MOD_BIT(code)   (1<<MOD_INDEX(code))
 #define MOD_INDEX(code) ((code) & 0x07)
 #define FN_BIT(code)    (1<<FN_INDEX(code))
@@ -149,6 +149,10 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #define KC_WSTP KC_WWW_STOP
 #define KC_WREF KC_WWW_REFRESH
 #define KC_WFAV KC_WWW_FAVORITES
+/* Transparent */
+#define KC_TRANSPARENT  1
+#define KC_TRNS KC_TRANSPARENT
+
 
 
 /* USB HID Keyboard/Keypad Usage(0x07) */
diff --git a/keyboard/gh60/keymap.c b/keyboard/gh60/keymap.c
index 7e4f945f6..39bb474c4 100644
--- a/keyboard/gh60/keymap.c
+++ b/keyboard/gh60/keymap.c
@@ -166,12 +166,6 @@ static const uint16_t PROGMEM fn_actions[] = {
 action_t keymap_get_action(uint8_t layer, uint8_t row, uint8_t col) {
     uint8_t key = (pgm_read_byte(&keymaps[(layer)][(row)][(col)]));
 
-    // TODO: move to action.c ?
-    /* Transparently use default layer */
-    if (key == KC_TRANSPARENT) {
-        key = (pgm_read_byte(&keymaps[(default_layer)][(row)][(col)]));
-    }
-
     action_t action;
     switch (key) {
         case KC_A ... KC_EXSEL:
@@ -199,7 +193,9 @@ action_t keymap_get_action(uint8_t layer, uint8_t row, uint8_t col) {
                 action.code = ACTION_NO;
             }
             break;
-        case KC_NO ... KC_UNDEFINED:
+        case KC_TRNS:
+            action.code = ACTION_TRANSPARENT;
+            break;
         default:
             action.code = ACTION_NO;
             break;