diff --git a/ksudoku.h b/ksudoku.h
new file mode 100644
index 0000000..c6421c1
--- /dev/null
+++ b/ksudoku.h
@@ -0,0 +1,30 @@
+#ifndef _KSUDOKU_H_
+#define _KSUDOKU_H_
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/sysfs.h>
+
+ssize_t is_valid_show(void);
+ssize_t is_valid_store(void);
+
+ssize_t is_solved_show(void);
+ssize_t is_solved_store(void);
+
+struct matrix_attribute {
+	struct attribute attr;
+	ssize_t (*show)(void);
+	ssize_t (*store)(void);
+        bool value;
+};
+
+struct matrix {
+        char matrix[81];
+};
+
+#define MATRIX_ATTR_RO(_name) \
+	struct matrix_attribute matrix_##_name = __ATTR_RO(_name)
+
+#define MATRIX_ATTR_WO(_name) \
+	struct matrix_attribute matrix_##_name = __ATTR_WO(_name)
+
+#endif