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diff --git a/common/host.c b/common/host.c
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+++ b/common/host.c
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+/*
+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 <stdint.h>
+#include <avr/interrupt.h>
+#include "usb_keycodes.h"
+#include "host.h"
+#include "util.h"
+#include "debug.h"
+
+
+#ifdef NKRO_ENABLE
+bool keyboard_nkro = false;
+#endif
+
+static host_driver_t *driver;
+static report_keyboard_t report0;
+static report_keyboard_t report1;
+report_keyboard_t *keyboard_report = &report0;
+report_keyboard_t *keyboard_report_prev = &report1;
+
+
+static inline void add_key_byte(uint8_t code);
+static inline void del_key_byte(uint8_t code);
+static inline void add_key_bit(uint8_t code);
+static inline void del_key_bit(uint8_t code);
+
+
+void host_set_driver(host_driver_t *d)
+{
+ driver = d;
+}
+
+host_driver_t *host_get_driver(void)
+{
+ return driver;
+}
+
+uint8_t host_keyboard_leds(void)
+{
+ if (!driver) return 0;
+ return (*driver->keyboard_leds)();
+}
+
+/* keyboard report operations */
+void host_add_key(uint8_t key)
+{
+#ifdef NKRO_ENABLE
+ if (keyboard_nkro) {
+ add_key_bit(key);
+ return;
+ }
+#endif
+ add_key_byte(key);
+}
+
+void host_del_key(uint8_t key)
+{
+#ifdef NKRO_ENABLE
+ if (keyboard_nkro) {
+ del_key_bit(key);
+ return;
+ }
+#endif
+ del_key_byte(key);
+}
+
+void host_add_mod_bit(uint8_t mod)
+{
+ keyboard_report->mods |= mod;
+}
+
+void host_del_mod_bit(uint8_t mod)
+{
+ keyboard_report->mods &= ~mod;
+}
+
+void host_set_mods(uint8_t mods)
+{
+ keyboard_report->mods = mods;
+}
+
+void host_add_code(uint8_t code)
+{
+ if (IS_MOD(code)) {
+ host_add_mod_bit(MOD_BIT(code));
+ } else {
+ host_add_key(code);
+ }
+}
+
+void host_del_code(uint8_t code)
+{
+ if (IS_MOD(code)) {
+ host_del_mod_bit(MOD_BIT(code));
+ } else {
+ host_del_key(code);
+ }
+}
+
+void host_swap_keyboard_report(void)
+{
+ uint8_t sreg = SREG;
+ cli();
+ report_keyboard_t *tmp = keyboard_report_prev;
+ keyboard_report_prev = keyboard_report;
+ keyboard_report = tmp;
+ SREG = sreg;
+}
+
+void host_clear_keyboard_report(void)
+{
+ keyboard_report->mods = 0;
+ for (int8_t i = 0; i < REPORT_KEYS; i++) {
+ keyboard_report->keys[i] = 0;
+ }
+}
+
+uint8_t host_has_anykey(void)
+{
+ uint8_t cnt = 0;
+ for (int i = 0; i < REPORT_KEYS; i++) {
+ if (keyboard_report->keys[i])
+ cnt++;
+ }
+ return cnt;
+}
+
+uint8_t host_get_first_key(void)
+{
+#ifdef NKRO_ENABLE
+ if (keyboard_nkro) {
+ uint8_t i = 0;
+ for (; i < REPORT_KEYS && !keyboard_report->keys[i]; i++)
+ ;
+ return i<<3 | biton(keyboard_report->keys[i]);
+ }
+#endif
+ return keyboard_report->keys[0];
+}
+
+
+void host_send_keyboard_report(void)
+{
+ if (!driver) return;
+ (*driver->send_keyboard)(keyboard_report);
+}
+
+void host_mouse_send(report_mouse_t *report)
+{
+ if (!driver) return;
+ (*driver->send_mouse)(report);
+}
+
+void host_system_send(uint16_t data)
+{
+ if (!driver) return;
+ (*driver->send_system)(data);
+}
+
+void host_consumer_send(uint16_t data)
+{
+ // TODO: this is needed?
+ static uint16_t last_data = 0;
+ if (data == last_data) return;
+ last_data = data;
+
+ if (!driver) return;
+ (*driver->send_consumer)(data);
+}
+
+
+static inline void add_key_byte(uint8_t code)
+{
+ // TODO: fix ugly code
+ int8_t i = 0;
+ int8_t empty = -1;
+ for (; i < REPORT_KEYS; i++) {
+ if (keyboard_report_prev->keys[i] == code) {
+ keyboard_report->keys[i] = code;
+ break;
+ }
+ if (empty == -1 &&
+ keyboard_report_prev->keys[i] == 0 &&
+ keyboard_report->keys[i] == 0) {
+ empty = i;
+ }
+ }
+ if (i == REPORT_KEYS) {
+ if (empty != -1) {
+ keyboard_report->keys[empty] = code;
+ }
+ }
+}
+
+static inline void del_key_byte(uint8_t code)
+{
+ int i = 0;
+ for (; i < REPORT_KEYS; i++) {
+ if (keyboard_report->keys[i] == code) {
+ keyboard_report->keys[i] = 0;
+ break;
+ }
+ }
+}
+
+static inline void add_key_bit(uint8_t code)
+{
+ if ((code>>3) < REPORT_KEYS) {
+ keyboard_report->keys[code>>3] |= 1<<(code&7);
+ } else {
+ debug("add_key_bit: can't add: "); phex(code); debug("\n");
+ }
+}
+
+static inline void del_key_bit(uint8_t code)
+{
+ if ((code>>3) < REPORT_KEYS) {
+ keyboard_report->keys[code>>3] &= ~(1<<(code&7));
+ } else {
+ debug("del_key_bit: can't del: "); phex(code); debug("\n");
+ }
+}