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diff --git a/src/state.h b/src/state.h
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+/*****************************************************************************
+ *
+ * mtdev - MT device event converter (MIT license)
+ *
+ * Copyright (C) 2010 Henrik Rydberg <rydberg@euromail.se>
+ * Copyright (C) 2010 Canonical Ltd.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ *
+ ****************************************************************************/
+
+#ifndef MTDEV_STATE_H
+#define MTDEV_STATE_H
+
+#include "iobuf.h"
+#include "evbuf.h"
+
+/*
+ * struct mtdev_slot - represents the state of an input MT slot
+ * @abs: current values of ABS_MT axes for this slot
+ */
+struct mtdev_slot {
+        int abs[MT_ABS_SIZE];
+};
+
+/*
+ * struct mtdev_state - MT slot parsing
+ * @inbuf: input event buffer
+ * @outbuf: output event buffer
+ * @data: array of scratch slot data
+ * @used: bitmask of currently used slots
+ * @slot: slot currently being modified
+ * @lastid: last used tracking id
+ */
+struct mtdev_state {
+        struct mtdev_iobuf iobuf;
+        struct mtdev_evbuf inbuf;
+        struct mtdev_evbuf outbuf;
+        struct mtdev_slot data[DIM_FINGER];
+        bitmask_t used;
+        bitmask_t slot;
+        bitmask_t lastid;
+};
+
+#endif