Initial version of new code for layer switch is added.

14 files changed, 575 insertions, 437 deletions

diff --git a/common/command.c b/common/command.c
index 13d37242d9..0020d8a17c 100644
--- a/common/command.c
+++ b/common/command.c
@@ -23,7 +23,7 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #include "debug.h"
 #include "util.h"
 #include "timer.h"
-#include "layer.h"
+#include "keyboard.h"
 #include "matrix.h"
 #include "bootloader.h"
 #include "command.h"
diff --git a/common/host.c b/common/host.c
index 8dd2abbee8..fddd5b6627 100644
--- a/common/host.c
+++ b/common/host.c
@@ -56,6 +56,19 @@ uint8_t host_keyboard_leds(void)
     return (*driver->keyboard_leds)();
 }
 
+/* new interface */
+void host_register_key(uint8_t key)
+{
+    host_add_key(key);
+    host_send_keyboard_report();
+}
+
+void host_unregister_key(uint8_t key)
+{
+    host_del_key(key);
+    host_send_keyboard_report();
+}
+
 /* keyboard report operations */
 void host_add_key(uint8_t key)
 {
@@ -158,6 +171,14 @@ void host_send_keyboard_report(void)
 {
     if (!driver) return;
     (*driver->send_keyboard)(keyboard_report);
+
+    if (debug_keyboard) {
+        print("keys: ");
+        for (int i = 0; i < REPORT_KEYS; i++) {
+            phex(keyboard_report->keys[i]); print(" ");
+        }
+        print(" mods: "); phex(keyboard_report->mods); print("\n");
+    }
 }
 
 void host_mouse_send(report_mouse_t *report)
@@ -216,7 +237,6 @@ static inline void del_key_byte(uint8_t code)
     for (; i < REPORT_KEYS; i++) {
         if (keyboard_report->keys[i] == code) {
             keyboard_report->keys[i] = 0;
-            break;
         }
     }
 }
diff --git a/common/host.h b/common/host.h
index 26bf3c362f..84a6c24773 100644
--- a/common/host.h
+++ b/common/host.h
@@ -39,6 +39,10 @@ void host_set_driver(host_driver_t *driver);
 host_driver_t *host_get_driver(void);
 uint8_t host_keyboard_leds(void);
 
+/* new interface */
+void host_register_key(uint8_t key);
+void host_unregister_key(uint8_t key);
+
 /* keyboard report operations */
 void host_add_key(uint8_t key);
 void host_del_key(uint8_t key);
diff --git a/common/keyboard.c b/common/keyboard.c
index 25f32eb02f..9f0c27670e 100644..100755
--- a/common/keyboard.c
+++ b/common/keyboard.c
@@ -15,15 +15,16 @@ You should have received a copy of the GNU General Public License
 along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 #include "keyboard.h"
-#include "host.h"
-#include "layer.h"
 #include "matrix.h"
+#include "keymap.h"
+#include "host.h"
 #include "led.h"
 #include "usb_keycodes.h"
 #include "timer.h"
 #include "print.h"
 #include "debug.h"
 #include "command.h"
+#include "util.h"
 #ifdef MOUSEKEY_ENABLE
 #include "mousekey.h"
 #endif
@@ -32,162 +33,444 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #endif
 
 
-static uint8_t last_leds = 0;
+#define LAYER_DELAY     250
 
+typedef enum keykind {
+    NONE,
+    FN_DOWN, FN_UP,
+    FNK_DOWN, FNK_UP,
+    KEY_DOWN, KEY_UP,
+    MOD_DOWN, MOD_UP,
+    MOUSEKEY_DOWN, MOUSEKEY_UP,
+    DELAY
+} keykind_t;
 
-void keyboard_init(void)
+typedef enum { IDLE, DELAYING, WAITING, PRESSING } kbdstate_t;
+
+
+uint8_t current_layer = 0;
+uint8_t default_layer = 0;
+
+/* keyboard internal states */
+static kbdstate_t kbdstate = IDLE;
+static uint8_t fn_state_bits = 0;
+static keyrecord_t delayed_fn;
+static keyrecord_t waiting_key;
+
+
+static const char *state_str(kbdstate_t state)
 {
-    timer_init();
-    matrix_init();
-#ifdef PS2_MOUSE_ENABLE
-    ps2_mouse_init();
-#endif
+    if (state == IDLE)      return PSTR("IDLE");
+    if (state == DELAYING)  return PSTR("DELAYING");
+    if (state == WAITING)   return PSTR("WAITING");
+    if (state == PRESSING)  return PSTR("PRESSING");
+    return PSTR("UNKNOWN");
 }
 
-void keyboard_proc(void)
+static inline keykind_t get_keykind(uint8_t code, bool pressed)
 {
-    uint8_t fn_bits = 0;
-#ifdef EXTRAKEY_ENABLE
-    uint16_t consumer_code = 0;
-    uint16_t system_code = 0;
-#endif
-
-    matrix_scan();
+    if IS_KEY(code) return (pressed ? KEY_DOWN      : KEY_UP);
+    if IS_MOD(code) return (pressed ? MOD_DOWN      : MOD_UP);
+    if IS_FN(code) {
+        if (keymap_fn_keycode(FN_INDEX(code)))
+            return (pressed ? FNK_DOWN : FNK_UP);
+        else
+            return (pressed ? FN_DOWN : FN_UP);
+    }
+    if IS_MOUSEKEY(code)    return (pressed ? MOUSEKEY_DOWN : MOUSEKEY_UP);
+    return  NONE;
+}
 
-    if (matrix_is_modified()) {
-        if (debug_matrix) matrix_print();
-#ifdef DEBUG_LED
-        // LED flash for debug
-        DEBUG_LED_CONFIG;
-        DEBUG_LED_ON;
-#endif
+static void layer_switch_on(uint8_t code)
+{
+    if (!IS_FN(code)) return;
+    fn_state_bits |= FN_BIT(code);
+    if (current_layer != keymap_fn_layer(FN_INDEX(code))) {
+        //TODO: clear all key execpt Mod key
+        debug("Layer Switch(on): "); debug_hex(current_layer);
+        current_layer = keymap_fn_layer(FN_INDEX(code));
+        debug(" -> "); debug_hex(current_layer); debug("\n");
     }
+}
 
-    if (matrix_has_ghost()) {
-        // should send error?
-        debug("matrix has ghost!!\n");
-        return;
+static void layer_switch_off(uint8_t code)
+{
+    if (!IS_FN(code)) return;
+    fn_state_bits &= ~FN_BIT(code);
+    if (current_layer != keymap_fn_layer(biton(fn_state_bits))) {
+        //TODO: clear all key execpt Mod key
+        debug("Layer Switch(off): "); debug_hex(current_layer);
+        current_layer = keymap_fn_layer(biton(fn_state_bits));
+        debug(" -> "); debug_hex(current_layer); debug("\n");
     }
+}
 
-    host_swap_keyboard_report();
-    host_clear_keyboard_report();
-    for (int row = 0; row < matrix_rows(); row++) {
-        for (int col = 0; col < matrix_cols(); col++) {
-            if (!matrix_is_on(row, col)) continue;
-
-            uint8_t code = layer_get_keycode(row, col);
-            if (code == KB_NO) {
-                // do nothing
-            } else if (IS_MOD(code)) {
-                host_add_mod_bit(MOD_BIT(code));
-            } else if (IS_FN(code)) {
-                fn_bits |= FN_BIT(code);
-            }
-// TODO: use table or something
-#ifdef EXTRAKEY_ENABLE
-            // System Control
-            else if (code == KB_SYSTEM_POWER) {
-#ifdef HOST_PJRC
-                if (suspend && remote_wakeup) {
-                    usb_remote_wakeup();
+static inline uint8_t get_keycode(key_t key)
+{
+    return keymap_get_keycode(current_layer, key.row, key.col);
+}
+
+// whether any key except modifier is down or not
+static inline bool is_anykey_down(void)
+{
+    for (int r = 0; r < MATRIX_ROWS; r++) {
+        matrix_row_t matrix_row = matrix_get_row(r);
+        for (int c = 0; c < MATRIX_COLS; c++) {
+            if (matrix_row && (1<<c)) {
+                if (IS_KEY(get_keycode((key_t){ .row = r, .col = c }))) {
+                    return true;
                 }
-#endif
-                system_code = SYSTEM_POWER_DOWN;
-            } else if (code == KB_SYSTEM_SLEEP) {
-                system_code = SYSTEM_SLEEP;
-            } else if (code == KB_SYSTEM_WAKE) {
-                system_code = SYSTEM_WAKE_UP;
-            }
-            // Consumer Page
-            else if (code == KB_AUDIO_MUTE) {
-                consumer_code = AUDIO_MUTE;
-            } else if (code == KB_AUDIO_VOL_UP) {
-                consumer_code = AUDIO_VOL_UP;
-            } else if (code == KB_AUDIO_VOL_DOWN) {
-                consumer_code = AUDIO_VOL_DOWN;
             }
-            else if (code == KB_MEDIA_NEXT_TRACK) {
-                consumer_code = TRANSPORT_NEXT_TRACK;
-            } else if (code == KB_MEDIA_PREV_TRACK) {
-                consumer_code = TRANSPORT_PREV_TRACK;
-            } else if (code == KB_MEDIA_STOP) {
-                consumer_code = TRANSPORT_STOP;
-            } else if (code == KB_MEDIA_PLAY_PAUSE) {
-                consumer_code = TRANSPORT_PLAY_PAUSE;
-            } else if (code == KB_MEDIA_SELECT) {
-                consumer_code = AL_CC_CONFIG;
-            }
-            else if (code == KB_MAIL) {
-                consumer_code = AL_EMAIL;
-            } else if (code == KB_CALCULATOR) {
-                consumer_code = AL_CALCULATOR;
-            } else if (code == KB_MY_COMPUTER) {
-                consumer_code = AL_LOCAL_BROWSER;
-            }
-            else if (code == KB_WWW_SEARCH) {
-                consumer_code = AC_SEARCH;
-            } else if (code == KB_WWW_HOME) {
-                consumer_code = AC_HOME;
-            } else if (code == KB_WWW_BACK) {
-                consumer_code = AC_BACK;
-            } else if (code == KB_WWW_FORWARD) {
-                consumer_code = AC_FORWARD;
-            } else if (code == KB_WWW_STOP) {
-                consumer_code = AC_STOP;
-            } else if (code == KB_WWW_REFRESH) {
-                consumer_code = AC_REFRESH;
-            } else if (code == KB_WWW_FAVORITES) {
-                consumer_code = AC_BOOKMARKS;
+        }
+    }
+    return false;
+}
+
+static void register_code(uint8_t code)
+{
+    if IS_KEY(code) {
+        host_add_key(code);
+        host_send_keyboard_report();
+    }
+    else if IS_MOD(code) {
+        host_add_mod_bit(MOD_BIT(code));
+        host_send_keyboard_report();
+    }
+    else if IS_MOUSEKEY(code) {
+        mousekey_on(code);
+        mousekey_send();
+    }
+}
+
+static void unregister_code(uint8_t code)
+{
+    if IS_KEY(code) {
+        host_del_key(code);
+        host_send_keyboard_report();
+    }
+    else if IS_MOD(code) {
+        host_del_mod_bit(MOD_BIT(code));
+        host_send_keyboard_report();
+    }
+    else if IS_MOUSEKEY(code) {
+        mousekey_off(code);
+        mousekey_send();
+    }
+}
+
+/*
+ *
+ * Event/State|IDLE             DELAYING[f]     WAITING[f,k]        PRESSING
+ * -----------+------------------------------------------------------------------
+ * Fn  Down   |IDLE(L+)         WAITING(Sk)     WAITING(Sk)         -
+ *     Up     |IDLE(L-)         IDLE(L-)        IDLE(L-)            IDLE(L-)  
+ * Fnk Down   |DELAYING(Sf)     WAITING(Sk)     WAINTING(Sk)        PRESSING(Rf)
+ *     Up     |IDLE(L-)         IDLE(Rf,Uf)     IDLE(Rf,Ps,Uf)*3    PRESSING(Uf)
+ * Key Down   |PRESSING(Rk)     WAITING(Sk)     WAITING(Sk)         PRESSING(Rk)
+ *     Up     |IDLE(Uk)         DELAYING(Uk)    IDLE(L+,Ps,Uk)      IDLE(Uk)*4
+ * Delay      |-                IDLE(L+)        IDLE(L+,Ps)         -
+ *            |
+ * No key Down|IDLE(Ld)         IDLE(Ld)        IDLE(Ld)            IDLE(Ld)
+ *
+ * *2: register Fnk if any key is pressing
+ * *3: when Fnk == Stored Fnk, if not ignore.
+ * *4: when no registered key any more
+ *
+ * States:
+ *      IDLE:
+ *      DELAYING: delay layer switch after pressing Fn with alt keycode
+ *      WAITING: key is pressed during DELAYING
+ *
+ * Events:
+ *      Fn: Fn key without alternative keycode
+ *      Fnk: Fn key with alternative keycode
+ *      -: ignore
+ *
+ * Actions:
+ *      Rk: register key
+ *      Uk: unregister key
+ *      Rf: register stored Fn(alt keycode)
+ *      Uf: unregister stored Fn(alt keycode)
+ *      Rs: register stored key
+ *      Us: unregister stored key
+ *      Sk: store key
+ *      Sf: store Fn
+ *      Ps: play stored key(Interpret stored key and transit state)
+ *      L+: Switch to new layer(*retain* Modifiers only)
+ *      L-: Switch back to last layer(*clear* stored key/Fn, *unregister* all Modifier/key)
+ *      Ld: Switch back to default layer(*clear* stored key/Fn, *unregister* all Modifier/key)
+ */
+#define NEXT(state)     do { \
+    debug("NEXT: "); print_P(state_str(kbdstate)); \
+    kbdstate = state; \
+    debug(" -> "); print_P(state_str(kbdstate)); debug("\n"); \
+} while (0)
+
+static inline void process_key(keyevent_t event)
+{
+    
+    /* TODO: ring buffer
+    static keyrecord_t waiting_keys[5];
+    static uint8_t waiting_keys_head = 0;
+    static uint8_t waiting_keys_tail = 0;
+    */
+
+    uint8_t code = get_keycode(event.key);
+    keykind_t kind = get_keykind(code, event.pressed);
+
+    uint8_t tmp_mods;
+
+    //debug("kbdstate: "); debug_hex(kbdstate);
+    debug("state: "); print_P(state_str(kbdstate));
+    debug(" kind: "); debug_hex(kind);
+    debug(" code: "); debug_hex(code);
+    if (event.pressed) { debug("d"); } else { debug("u"); }
+    debug("\n");
+    switch (kbdstate) {
+        case IDLE:
+            switch (kind) {
+                case FN_DOWN:
+                    layer_switch_on(code);
+                    break;
+                case FN_UP:
+                    layer_switch_off(code);
+                    break;
+                case FNK_DOWN:
+                    // store event
+                    delayed_fn = (keyrecord_t) { .event = event, .code = code, .mods = keyboard_report->mods, .time = timer_read() };
+                    NEXT(DELAYING);
+                    break;
+                case FNK_UP:
+                    layer_switch_off(code);
+                    break;
+                case KEY_DOWN:
+                case MOUSEKEY_DOWN:
+                    register_code(code);
+                    NEXT(PRESSING);
+                    break;
+                case MOD_DOWN:
+                    register_code(code);
+                    break;
+                case KEY_UP:
+                case MOUSEKEY_UP:
+                case MOD_UP:
+                    unregister_code(code);
+                    break;
+                default:
+                    break;
             }
-#endif
-            else if (IS_KEY(code)) {
-                host_add_key(code);
+            break;
+        case PRESSING:
+            switch (kind) {
+                case FN_DOWN:
+                    // ignored when any key is pressed
+                    break;
+                case FN_UP:
+                    layer_switch_off(code);
+                    NEXT(IDLE);
+                    break;
+                case FNK_DOWN:
+                    register_code(keymap_fn_keycode(FN_INDEX(code)));
+                    break;
+                case FNK_UP:
+                    unregister_code(keymap_fn_keycode(FN_INDEX(code)));
+                    break;
+                case KEY_DOWN:
+                case MOD_DOWN:
+                case MOUSEKEY_DOWN:
+                    register_code(code);
+                    break;
+                case KEY_UP:
+                case MOD_UP:
+                case MOUSEKEY_UP:
+                    unregister_code(code);
+                    // no key registered? mousekey, mediakey, systemkey
+                    if (!host_has_anykey())
+                        NEXT(IDLE);
+                    break;
+                default:
+                    break;
             }
-#ifdef MOUSEKEY_ENABLE
-            else if (IS_MOUSEKEY(code)) {
-                mousekey_decode(code);
+            break;
+        case DELAYING:
+            switch (kind) {
+                case FN_DOWN:
+                case FNK_DOWN:
+                case KEY_DOWN:
+                case MOUSEKEY_DOWN:
+                    waiting_key = (keyrecord_t) { .event = event, .code = code, .mods = keyboard_report->mods, .time = timer_read() };
+                    NEXT(WAITING);
+                    break;
+                case MOD_DOWN:
+                    register_code(code);
+                    break;
+                case FN_UP:
+                    layer_switch_off(code);
+                    NEXT(IDLE);
+                    break;
+                case FNK_UP:
+                    if (code == delayed_fn.code) {
+                        // type Fn with alt keycode
+                        // restore the mod status at the time of pressing Fn key
+                        tmp_mods = keyboard_report->mods;
+                        host_set_mods(delayed_fn.mods);
+                        register_code(keymap_fn_keycode(FN_INDEX(delayed_fn.code)));
+                        unregister_code(keymap_fn_keycode(FN_INDEX(delayed_fn.code)));
+                        host_set_mods(tmp_mods);
+                        NEXT(IDLE);
+                    } else {
+                        layer_switch_off(code);
+                        NEXT(IDLE);
+                    }
+                    break;
+                case KEY_UP:
+                case MOUSEKEY_UP:
+                    unregister_code(code);
+                    NEXT(IDLE);
+                    break;
+                case MOD_UP:
+                    unregister_code(code);
+                    break;
+                default:
+                    break;
             }
-#endif
-            else {
-                debug("ignore keycode: "); debug_hex(code); debug("\n");
+            break;
+        case WAITING:
+            switch (kind) {
+                case FN_DOWN:
+                case FNK_DOWN:
+                case KEY_DOWN:
+                case MOUSEKEY_DOWN:
+                    tmp_mods = keyboard_report->mods;
+                    host_set_mods(delayed_fn.mods);
+                    register_code(keymap_fn_keycode(FN_INDEX(delayed_fn.code)));
+                    host_set_mods(waiting_key.mods);
+                    register_code(waiting_key.code);
+                    host_set_mods(tmp_mods);
+                    register_code(code);
+                    NEXT(IDLE);
+                    break;
+                case MOD_DOWN:
+                    register_code(code);
+                    break;
+                case FN_UP:
+                    layer_switch_off(code);
+                    NEXT(IDLE);
+                    break;
+                case FNK_UP:
+                    if (code == delayed_fn.code) {
+                        // alt down, key down, alt up
+                        tmp_mods = keyboard_report->mods;
+                        host_set_mods(delayed_fn.mods);
+                        register_code(keymap_fn_keycode(FN_INDEX(delayed_fn.code)));
+                        host_set_mods(waiting_key.mods);
+                        register_code(waiting_key.code);
+                        unregister_code(keymap_fn_keycode(FN_INDEX(delayed_fn.code)));
+                        host_set_mods(tmp_mods);
+                        NEXT(IDLE);
+                    } else {
+                        layer_switch_off(code);
+                        NEXT(IDLE);
+                    }
+                    break;
+                case KEY_UP:
+                case MOUSEKEY_UP:
+                    if (code == waiting_key.code) {
+                        layer_switch_on(delayed_fn.code);
+                        NEXT(IDLE);
+                        // process waiting_key
+                        tmp_mods = keyboard_report->mods;
+                        host_set_mods(waiting_key.mods);
+                        process_key(waiting_key.event);
+                        host_set_mods(tmp_mods);
+                        process_key(event);
+                    } else {
+                        unregister_code(code);
+                    }
+                    break;
+                case MOD_UP:
+                    unregister_code(code);
+                    break;
+                default:
+                    break;
             }
-        }
+            break;
     }
 
-    layer_switching(fn_bits);
+    // TODO: FAIL SAFE: unregister all keys when no key down
+}
+
+void keyboard_init(void)
+{
+    debug_keyboard = true;
+
+    timer_init();
+    matrix_init();
+#ifdef PS2_MOUSE_ENABLE
+    ps2_mouse_init();
+#endif
+}
+
+void keyboard_task(void)
+{
+    static matrix_row_t matrix_prev[MATRIX_ROWS];
+    matrix_row_t matrix_row = 0;
+    matrix_row_t matrix_change = 0;
 
+    matrix_scan();
     if (command_proc()) {
+        debug("COMMAND\n");
+        // TODO: clear all keys
+        host_clear_keyboard_report();
+        host_send_keyboard_report();
         return;
     }
+    for (int r = 0; r < MATRIX_ROWS; r++) {
+        matrix_row = matrix_get_row(r);
+        matrix_change = matrix_row ^ matrix_prev[r];
+        if (matrix_change) {
+            // TODO: print once per scan
+            if (debug_matrix) matrix_print();
 
-    // TODO: should send only when changed from last report
-    if (matrix_is_modified()) {
-        host_send_keyboard_report();
-#ifdef EXTRAKEY_ENABLE
-        host_consumer_send(consumer_code);
-        host_system_send(system_code);
-#endif
-#ifdef DEBUG_LED
-        // LED flash for debug
-        DEBUG_LED_CONFIG;
-        DEBUG_LED_OFF;
-#endif
+            for (int c = 0; c < MATRIX_COLS; c++) {
+                if (matrix_change & (1<<c)) {
+                    process_key((keyevent_t){
+                        .key = (key_t){ .row = r, .col = c },
+                        .pressed = (matrix_row & (1<<c))
+                    });
+                    // record a processed key
+                    matrix_prev[r] ^= (1<<c);
+                    // process a key per task call
+                    goto MATRIX_LOOP_END;
+                }
+            }
+        }
     }
+    MATRIX_LOOP_END:
+    // TODO: FAIL SAFE: clear all key if no key down
 
-#ifdef MOUSEKEY_ENABLE
-    mousekey_send();
-#endif
+    // layer switch when delay term elapses
+    if (kbdstate == DELAYING || kbdstate == WAITING) {
+        if (timer_elapsed(delayed_fn.time) > LAYER_DELAY) {
+            if (kbdstate == DELAYING) {
+                layer_switch_on(delayed_fn.code);
+                NEXT(IDLE);
+            }
+            if (kbdstate == WAITING) {
+                layer_switch_on(delayed_fn.code);
+                NEXT(IDLE);
+                uint8_t tmp_mods = keyboard_report->mods;
+                host_set_mods(waiting_key.mods);
+                process_key(waiting_key.event);
+                host_set_mods(tmp_mods);
+            }
+        }
+    }
 
-#ifdef PS2_MOUSE_ENABLE
-    // TODO: should comform new API
-    if (ps2_mouse_read() == 0)
-        ps2_mouse_usb_send();
-#endif
+    // mousekey repeat & acceleration
+    mousekey_task();
 
-    if (last_leds != host_keyboard_leds()) {
-        keyboard_set_leds(host_keyboard_leds());
-        last_leds = host_keyboard_leds();
-    }
+    return;
 }
 
 void keyboard_set_leds(uint8_t leds)
diff --git a/common/keyboard.h b/common/keyboard.h
index 51bf67379a..2353805e17 100644..100755
--- a/common/keyboard.h
+++ b/common/keyboard.h
@@ -18,15 +18,41 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #ifndef KEYBOARD_H
 #define KEYBOARD_H
 
+#include <stdbool.h>
 #include <stdint.h>
 
 
 #ifdef __cplusplus
 extern "C" {
 #endif
+
+typedef struct {
+    uint8_t row;
+    uint8_t col;
+} key_t;
+
+typedef struct {
+    key_t    key;
+    bool     pressed;
+} keyevent_t;
+
+typedef struct {
+    keyevent_t  event;
+    uint8_t     code;
+    uint8_t     mods;
+    uint16_t    time;
+} keyrecord_t;
+
+#define KEYEQ(keya, keyb)     (keya.row == keyb.row && keya.col == keyb.col)
+
+
+extern uint8_t current_layer;
+extern uint8_t default_layer;
+
 void keyboard_init(void);
-void keyboard_proc(void);
+void keyboard_task(void);
 void keyboard_set_leds(uint8_t leds);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/common/layer.c b/common/layer.c
deleted file mode 100644
index 0854eede0d..0000000000
--- a/common/layer.c
+++ /dev/null
@@ -1,207 +0,0 @@
-/*
-Copyright 2011 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/>.
-*/
-
-#include "keymap.h"
-#include "host.h"
-#include "debug.h"
-#include "timer.h"
-#include "usb_keycodes.h"
-#include "layer.h"
-
-
-/*
- * Parameters:
- *     SWITCH_DELAY        |=======|
- *     SEND_FN_TERM        |================|
- *
- * Fn key processing cases:
- * 1. release Fn after SEND_FN_TERM.
- *     Layer sw         ___________|~~~~~~~~~~~|___
- *     Fn press         ___|~~~~~~~~~~~~~~~~~~~|___
- *     Fn send          ___________________________
- *
- * 2. release Fn during SEND_FN_TERM.(not layer used)
- *     Layer sw         ___________|~~~~~~|________
- *     Fn press         ___|~~~~~~~~~~~~~~|________
- *     Fn key send      __________________|~|______
- *     other key press  ___________________________
- *     other key send   ___________________________
- *
- * 3. release Fn during SEND_FN_TERM.(layer used)
- *     Layer sw         ___________|~~~~~~|________
- *     Fn press         ___|~~~~~~~~~~~~~~|________
- *     Fn key send      ___________________________
- *     Fn send          ___________________________
- *     other key press  _____________|~~|__________
- *     other key send   _____________|~~|__________
- *
- * 4. press other key during SWITCH_DELAY.
- *     Layer sw         ___________________________
- *     Fn key press     ___|~~~~~~~~~|_____________
- *     Fn key send      ______|~~~~~~|_____________
- *     other key press  ______|~~~|________________
- *     other key send   _______|~~|________________
- *
- * 5. press Fn while press other key.
- *     Layer sw         ___________________________
- *     Fn key press     ___|~~~~~~~~~|_____________
- *     Fn key send      ___|~~~~~~~~~|_____________
- *     other key press  ~~~~~~~|___________________
- *     other key send   ~~~~~~~|___________________
- *
- * 6. press Fn twice quickly and keep holding down.(repeat)
- *     Layer sw         ___________________________
- *     Fn key press     ___|~|____|~~~~~~~~~~~~~~~~
- *     Fn key send      _____|~|__|~~~~~~~~~~~~~~~~
- */
-
-// LAYER_SWITCH_DELAY: prevent from moving to new layer
-#ifndef LAYER_SWITCH_DELAY
-#   define LAYER_SWITCH_DELAY 150
-#endif
-
-// LAYER_SEND_FN_TERM: send keycode if release key in this term
-#ifndef LAYER_SEND_FN_TERM
-#   define LAYER_SEND_FN_TERM 500
-#endif
-
-
-uint8_t default_layer = 0;
-uint8_t current_layer = 0;
-
-static bool layer_used = false;
-static uint8_t new_layer(uint8_t fn_bits);
-
-
-uint8_t layer_get_keycode(uint8_t row, uint8_t col)
-{
-    uint8_t code = keymap_get_keycode(current_layer, row, col);
-    // normal key or mouse key
-    if ((IS_KEY(code) || IS_MOUSEKEY(code))) {
-        layer_used = true;
-    }
-    return code;
-}
-
-// bit substract b from a
-#define BIT_SUBST(a, b) (a&(a^b))
-void layer_switching(uint8_t fn_bits)
-{
-    // layer switching
-    static uint8_t last_fn = 0;
-    static uint8_t last_mods = 0;
-    static uint16_t last_timer = 0; 
-    static uint8_t sent_fn = 0;
-
-    if (fn_bits == last_fn) { // Fn state is not changed
-        if (fn_bits == 0) {
-            // do nothing
-        } else {
-            if (!keymap_fn_keycode(BIT_SUBST(fn_bits, sent_fn)) ||
-                    timer_elapsed(last_timer) > LAYER_SWITCH_DELAY) {
-                uint8_t _layer_to_switch = new_layer(BIT_SUBST(fn_bits, sent_fn));
-                if (current_layer != _layer_to_switch) { // not switch layer yet
-                    debug("Fn case: 1,2,3(LAYER_SWITCH_DELAY passed)\n");
-                    debug("Switch Layer: "); debug_hex(current_layer);
-                    current_layer = _layer_to_switch;
-                    layer_used = false;
-                    debug(" -> "); debug_hex(current_layer); debug("\n");
-                }
-            } else {
-                if (host_has_anykey()) { // other keys is pressed
-                    uint8_t _fn_to_send = BIT_SUBST(fn_bits, sent_fn);
-                    if (_fn_to_send) {
-                        debug("Fn case: 4(press other key during SWITCH_DELAY.)\n");
-                        // send only Fn key first
-                        uint8_t tmp_mods = keyboard_report->mods;
-                        host_add_code(keymap_fn_keycode(_fn_to_send));
-                        host_set_mods(last_mods);
-                        host_send_keyboard_report();
-                        host_set_mods(tmp_mods);
-                        host_del_code(keymap_fn_keycode(_fn_to_send));
-                        sent_fn |= _fn_to_send;
-                    }
-                }
-            }
-            // add Fn keys to send
-            //host_add_code(keymap_fn_keycode(fn_bits&sent_fn));  // TODO: do all Fn keys
-        }
-    } else { // Fn state is changed(edge)
-        uint8_t fn_changed = 0;
-
-        debug("fn_bits: "); debug_bin(fn_bits); debug("\n");
-        debug("sent_fn: "); debug_bin(sent_fn); debug("\n");
-        debug("last_fn: "); debug_bin(last_fn); debug("\n");
-        debug("last_mods: "); debug_hex(last_mods); debug("\n");
-        debug("last_timer: "); debug_hex16(last_timer); debug("\n");
-        debug("timer_count: "); debug_hex16(timer_count); debug("\n");
-
-        // pressed Fn
-        if ((fn_changed = BIT_SUBST(fn_bits, last_fn))) {
-            debug("fn_changed: "); debug_bin(fn_changed); debug("\n");
-            if (host_has_anykey()) {
-                debug("Fn case: 5(pressed Fn with other key)\n");
-                sent_fn |= fn_changed;
-            } else if (fn_changed & sent_fn) { // pressed same Fn in a row
-                if (timer_elapsed(last_timer) > LAYER_SEND_FN_TERM) {
-                    debug("Fn case: 6(not repeat)\n");
-                    // time passed: not repeate
-                    sent_fn &= ~fn_changed;
-                } else {
-                    debug("Fn case: 6(repeat)\n");
-                }
-            }
-        }
-        // released Fn
-        if ((fn_changed = BIT_SUBST(last_fn, fn_bits))) {
-            debug("fn_changed: "); debug_bin(fn_changed); debug("\n");
-            if (timer_elapsed(last_timer) < LAYER_SEND_FN_TERM) {
-                if (!layer_used && BIT_SUBST(fn_changed, sent_fn)) {
-                    debug("Fn case: 2(send Fn one shot: released Fn during LAYER_SEND_FN_TERM)\n");
-                    // send only Fn key first
-                    uint8_t tmp_mods = keyboard_report->mods;
-                    host_add_code(keymap_fn_keycode(fn_changed));
-                    host_set_mods(last_mods);
-                    host_send_keyboard_report();
-                    host_set_mods(tmp_mods);
-                    host_del_code(keymap_fn_keycode(fn_changed));
-                    sent_fn |= fn_changed;
-                }
-            }
-            debug("Switch Layer(released Fn): "); debug_hex(current_layer);
-            current_layer = new_layer(BIT_SUBST(fn_bits, sent_fn));
-            debug(" -> "); debug_hex(current_layer); debug("\n");
-        }
-
-        layer_used = false;
-        last_fn = fn_bits;
-        last_mods = keyboard_report->mods;
-        last_timer = timer_read();
-    }
-    // send Fn keys
-    for (uint8_t i = 0; i < 8; i++) {
-        if ((sent_fn & fn_bits) & (1<<i)) {
-            host_add_code(keymap_fn_keycode(1<<i));
-        }
-    }
-}
-
-inline
-static uint8_t new_layer(uint8_t fn_bits)
-{
-    return (fn_bits ? keymap_fn_layer(fn_bits) : default_layer);
-}
diff --git a/common/layer.h b/common/layer.h
deleted file mode 100644
index d9e8cebb8f..0000000000
--- a/common/layer.h
+++ /dev/null
@@ -1,32 +0,0 @@
-/*
-Copyright 2011 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 LAYER_H
-#define LAYER_H 1
-
-#include <stdint.h>
-
-extern uint8_t default_layer;
-extern uint8_t current_layer;