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diff --git a/common/matrix.h b/common/matrix.h
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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/>.
+*/
+
+#ifndef MATRIX_H
+#define MATRIX_H
+
+#include <stdbool.h>
+
+/* number of matrix rows */
+uint8_t matrix_rows(void);
+/* number of matrix columns */
+uint8_t matrix_cols(void);
+/* intialize matrix for scaning. should be called once. */
+void matrix_init(void);
+/* scan all key states on matrix */
+uint8_t matrix_scan(void);
+/* whether modified from previous scan. used after matrix_scan. */
+bool matrix_is_modified(void);
+/* whether ghosting occur on matrix. */
+bool matrix_has_ghost(void);
+/* whether a swtich is on */
+bool matrix_is_on(uint8_t row, uint8_t col);
+/* matrix state on row */
+#if (MATRIX_COLS <= 8)
+uint8_t matrix_get_row(uint8_t row);
+#else
+uint16_t matrix_get_row(uint8_t row);
+#endif
+/* count keys pressed */
+uint8_t matrix_key_count(void);
+/* print matrix for debug */
+void matrix_print(void);
+
+
+#endif