refactor: Move files

Move all headers into include, separate source files into modules
match, mtdev, src and driver, move some common definitions to
common.h, and include define support for the MT slot protocol.

This patch does not introduce any logical changes.

Signed-off-by: Henrik Rydberg <rydberg@euromail.se>

12 files changed, 672 insertions, 0 deletions

diff --git a/include/button.h b/include/button.h
new file mode 100644
index 0000000..0ebfbc7
--- /dev/null
+++ b/include/button.h
@@ -0,0 +1,43 @@
+/***************************************************************************
+ *
+ * Multitouch X driver
+ * Copyright (C) 2008 Henrik Rydberg <rydberg@euromail.se>
+ *
+ * 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, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ **************************************************************************/
+
+#ifndef BUTTON_H
+#define BUTTON_H
+
+#define DIM_BUTTON 15
+
+#define MT_BUTTON_LEFT 0
+#define MT_BUTTON_MIDDLE 1
+#define MT_BUTTON_RIGHT 2
+#define MT_BUTTON_WHEEL_UP 3
+#define MT_BUTTON_WHEEL_DOWN 4
+#define MT_BUTTON_HWHEEL_LEFT 5
+#define MT_BUTTON_HWHEEL_RIGHT 6
+#define MT_BUTTON_SWIPE_UP 7
+#define MT_BUTTON_SWIPE_DOWN 8
+#define MT_BUTTON_SWIPE_LEFT 9
+#define MT_BUTTON_SWIPE_RIGHT 10
+#define MT_BUTTON_SCALE_DOWN 11
+#define MT_BUTTON_SCALE_UP 12
+#define MT_BUTTON_ROTATE_LEFT 13
+#define MT_BUTTON_ROTATE_RIGHT 14
+
+#endif
diff --git a/include/common.h b/include/common.h
new file mode 100644
index 0000000..09582ce
--- /dev/null
+++ b/include/common.h
@@ -0,0 +1,128 @@
+/***************************************************************************
+ *
+ * Multitouch X driver
+ * Copyright (C) 2008 Henrik Rydberg <rydberg@euromail.se>
+ *
+ * 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, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ **************************************************************************/
+
+#ifndef COMMON_H
+#define COMMON_H
+
+#include "xorg-server.h"
+#include <xf86.h>
+#include <xf86_OSproc.h>
+#include <xf86Xinput.h>
+#include <linux/input.h>
+#include <errno.h>
+
+/* includes available in 2.6.30-rc5 */
+
+#ifndef BTN_TOOL_QUADTAP
+#define BTN_TOOL_QUADTAP        0x14f   /* Four fingers on trackpad */
+#define ABS_MT_TOUCH_MAJOR      0x30    /* Major axis of touching ellipse */
+#define ABS_MT_TOUCH_MINOR      0x31    /* Minor axis (omit if circular) */
+#define ABS_MT_WIDTH_MAJOR      0x32    /* Major axis of approaching ellipse */
+#define ABS_MT_WIDTH_MINOR      0x33    /* Minor axis (omit if circular) */
+#define ABS_MT_ORIENTATION      0x34    /* Ellipse orientation */
+#define ABS_MT_POSITION_X       0x35    /* Center X ellipse position */
+#define ABS_MT_POSITION_Y       0x36    /* Center Y ellipse position */
+#define ABS_MT_TOOL_TYPE        0x37    /* Type of touching device */
+#define ABS_MT_BLOB_ID          0x38    /* Group a set of packets as a blob */
+#define ABS_MT_TRACKING_ID      0x39    /* Unique ID of initiated contact */
+#define SYN_MT_REPORT           2
+#define MT_TOOL_FINGER          0
+#define MT_TOOL_PEN             1
+#endif
+
+/* includes available in 2.6.33 */
+#ifndef ABS_MT_PRESSURE
+#define ABS_MT_PRESSURE         0x3a    /* Pressure on contact area */
+#endif
+
+/* includes available in 2.6.36 */
+#ifndef ABS_MT_SLOT
+#define ABS_MT_SLOT             0x2f    /* MT slot being modified */
+#define MT_ABS_SIZE             11      /* Size of MT_SLOT_ABS_EVENTS */
+#define MT_SLOT_ABS_EVENTS {    \
+        ABS_MT_TOUCH_MAJOR,     \
+        ABS_MT_TOUCH_MINOR,     \
+        ABS_MT_WIDTH_MAJOR,     \
+        ABS_MT_WIDTH_MINOR,     \
+        ABS_MT_ORIENTATION,     \
+        ABS_MT_POSITION_X,      \
+        ABS_MT_POSITION_Y,      \
+        ABS_MT_TOOL_TYPE,       \
+        ABS_MT_BLOB_ID,         \
+        ABS_MT_TRACKING_ID,     \
+        ABS_MT_PRESSURE,        \
+}
+#endif
+
+#define DIM_FINGER 32
+#define DIM2_FINGER (DIM_FINGER * DIM_FINGER)
+
+/* event buffer size (must be a power of two) */
+#define DIM_EVENTS 64
+
+/* year-proof millisecond event time */
+typedef __u64 mstime_t;
+
+/* all bit masks have this type */
+typedef unsigned int bitmask_t;
+
+#define BITMASK(x) (1U << (x))
+#define BITONES(x) (BITMASK(x) - 1U)
+#define GETBIT(m, x) (((m) >> (x)) & 1U)
+#define SETBIT(m, x) (m |= BITMASK(x))
+#define CLEARBIT(m, x) (m &= ~BITMASK(x))
+#define MODBIT(m, x, b) ((b) ? SETBIT(m, x) : CLEARBIT(m, x))
+
+static inline int maxval(int x, int y) { return x > y ? x : y; }
+static inline int minval(int x, int y) { return x < y ? x : y; }
+
+static inline int clamp15(int x)
+{
+        return x < -32767 ? -32767 : x > 32767 ? 32767 : x;
+}
+
+/* absolute scale is assumed to fit in 15 bits */
+static inline int dist2(int dx, int dy)
+{
+        dx = clamp15(dx);
+        dy = clamp15(dy);
+        return dx * dx + dy * dy;
+}
+
+/* Count number of bits (Sean Eron Andersson's Bit Hacks) */
+static inline int bitcount(unsigned v)
+{
+        v -= ((v>>1) & 0x55555555);
+        v = (v&0x33333333) + ((v>>2) & 0x33333333);
+        return (((v + (v>>4)) & 0xF0F0F0F) * 0x1010101) >> 24;
+}
+
+/* Return index of first bit [0-31], -1 on zero */
+#define firstbit(v) (__builtin_ffs(v) - 1)
+
+/* boost-style foreach bit */
+#define foreach_bit(i, m)                                               \
+        for (i = firstbit(m); i >= 0; i = firstbit((m) & (~0U << i + 1)))
+
+/* robust system ioctl calls */
+#define SYSCALL(call) while (((call) == -1) && (errno == EINTR))
+
+#endif
diff --git a/include/gestures.h b/include/gestures.h
new file mode 100644
index 0000000..2866ba4
--- /dev/null
+++ b/include/gestures.h
@@ -0,0 +1,43 @@
+/***************************************************************************
+ *
+ * Multitouch X driver
+ * Copyright (C) 2008 Henrik Rydberg <rydberg@euromail.se>
+ *
+ * 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, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ **************************************************************************/
+
+#ifndef GESTURES_H
+#define GESTURES_H
+
+#include "mtouch.h"
+
+#define GS_BUTTON 0
+#define GS_MOVE 1
+#define GS_VSCROLL 2
+#define GS_HSCROLL 3
+#define GS_VSWIPE 4
+#define GS_HSWIPE 5
+#define GS_SCALE 6
+#define GS_ROTATE 7
+
+struct Gestures {
+        unsigned type, btmask, btdata;
+        int same_fingers, dx, dy, scale, rot;
+};
+
+void extract_gestures(struct Gestures *gs, struct MTouch* mt);
+
+#endif
diff --git a/include/hwdata.h b/include/hwdata.h
new file mode 100644
index 0000000..21864dc
--- /dev/null
+++ b/include/hwdata.h
@@ -0,0 +1,75 @@
+/***************************************************************************
+ *
+ * Multitouch X driver
+ * Copyright (C) 2008 Henrik Rydberg <rydberg@euromail.se>
+ *
+ * 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, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ **************************************************************************/
+
+#ifndef HWDATA_H
+#define HWDATA_H
+
+#include "common.h"
+#include "button.h"
+
+#define BIT_MT_TOUCH_MAJOR 0
+#define BIT_MT_TOUCH_MINOR 1
+#define BIT_MT_WIDTH_MAJOR 2
+#define BIT_MT_WIDTH_MINOR 3
+#define BIT_MT_ORIENTATION 4
+#define BIT_MT_PRESSURE 5
+#define BIT_MT_POSITION_X 6
+#define BIT_MT_POSITION_Y 7
+#define BIT_MT_CNT 8
+
+struct FingerData {
+        int touch_major, touch_minor;
+        int width_major, width_minor;
+        int orientation, pressure;
+        int position_x, position_y;
+};
+
+/**
+ * struct HWData - hardware reads
+ *
+ * @finger: finger data
+ * @mask: bits corresponding to data actually read (readonly)
+ * @mread: bits corresponding to data in progress (writeonly)
+ * @button: bitmask of buttons
+ * @nfinger: number of fingers actually read (readonly)
+ * @nread: number of fingers in progress (writeonly)
+ *
+ */
+struct HWData {
+        struct FingerData finger[DIM_FINGER];
+        unsigned mask[DIM_FINGER], mread[DIM_FINGER];
+        unsigned button;
+        int nfinger, mtread, nread;
+        mstime_t evtime;
+};
+
+void init_hwdata(struct HWData *hw);
+int read_hwdata(struct HWData *hw, const struct input_event* ev);
+void output_hwdata(const struct HWData *hw);
+
+static inline int finger_dist2(const struct FingerData *a,
+                               const struct FingerData *b)
+{
+        return dist2(a->position_x - b->position_x,
+                     a->position_y - b->position_y);
+}
+
+#endif
diff --git a/include/hwstate.h b/include/hwstate.h
new file mode 100644
index 0000000..76ed016
--- /dev/null
+++ b/include/hwstate.h
@@ -0,0 +1,47 @@
+/***************************************************************************
+ *
+ * Multitouch X driver
+ * Copyright (C) 2008 Henrik Rydberg <rydberg@euromail.se>
+ *
+ * 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, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ **************************************************************************/
+
+#ifndef HWSTATE_H
+#define HWSTATE_H
+
+#include "mtdev-caps.h"
+#include "hwdata.h"
+
+/* zero id means not mapped (not touching) */
+struct FingerState {
+        struct FingerData hw;
+        int id;
+};
+
+struct HWState {
+        struct FingerState finger[DIM_FINGER];
+        unsigned button;
+        int nfinger;
+        mstime_t evtime;
+        int lastid;
+};
+
+void init_hwstate(struct HWState *s);
+void modify_hwstate(struct HWState *s,
+                    const struct HWData *hw,
+                    const struct Capabilities *caps);
+
+#endif
diff --git a/include/match.h b/include/match.h
new file mode 100644
index 0000000..25842fc
--- /dev/null
+++ b/include/match.h
@@ -0,0 +1,36 @@
+/***************************************************************************
+ *
+ * Multitouch X driver
+ * Copyright (C) 2008 Henrik Rydberg <rydberg@euromail.se>
+ *
+ * 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, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ **************************************************************************/
+
+#ifndef MATCHER_H
+#define MATCHER_H
+
+/**
+ * Special implementation of the hungarian algorithm.
+ * The maximum number of fingers matches a uint32.
+ * Bitmasks are used extensively.
+ */
+
+#include "common.h"
+
+void match_fingers(int index[DIM_FINGER], int A[DIM2_FINGER],
+                   int nrow, int ncol);
+
+#endif
diff --git a/include/memory.h b/include/memory.h
new file mode 100644
index 0000000..8ffbdab
--- /dev/null
+++ b/include/memory.h
@@ -0,0 +1,73 @@
+/***************************************************************************
+ *
+ * Multitouch X driver
+ * Copyright (C) 2008 Henrik Rydberg <rydberg@euromail.se>
+ *
+ * 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, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ **************************************************************************/
+
+#ifndef MEMORY_H
+#define MEMORY_H
+
+#include "mtstate.h"
+
+/**
+ * struct Memory - parsing state
+ *
+ * @btdata: logical finger state
+ * @same: true if the finger configuration is unchanged
+ * @fingers: bitmask of fingers on the pad
+ * @added: bitmask of new fingers on the pad
+ * @thumb: bitmask of thumbs on the pad
+ * @pointing: bitmask of pointing fingers
+ * @pending: bitmask of tentatively moving fingers
+ * @moving: bitmask of moving fingers
+ * @ybar: vertical position on pad marking the clicking area
+ * @mvhold: movement before this point in time is accumulated
+ * @mvforget: movement before this point in time is discarded
+ * @dx: array of accumulated horiontal movement per finger
+ * @dy: array of accumulated vertical movement per finger
+ *
+ */
+struct Memory {
+        unsigned btdata, same;
+        unsigned fingers, added, thumb;
+        unsigned pointing, pending, moving;
+        int ybar;
+        mstime_t mvhold, mvforget;
+        int dx[DIM_FINGER], dy[DIM_FINGER];
+};
+
+void init_memory(struct Memory *mem);
+void refresh_memory(struct Memory *m,
+                    const struct MTState *prev_state,
+                    const struct MTState *state,
+                    const struct Capabilities *caps);
+void output_memory(const struct Memory *m);
+
+static inline void mem_hold_movement(struct Memory *m, mstime_t t)
+{
+        if (t > m->mvhold)
+                m->mvhold = t;
+}
+
+static inline void mem_forget_movement(struct Memory *m, mstime_t t)
+{
+        if (t > m->mvforget)
+                m->mvforget = t;
+}
+
+#endif
diff --git a/include/mtdev-caps.h b/include/mtdev-caps.h
new file mode 100644
index 0000000..8f88404
--- /dev/null
+++ b/include/mtdev-caps.h
@@ -0,0 +1,57 @@
+/***************************************************************************
+ *
+ * Multitouch X driver
+ * Copyright (C) 2008 Henrik Rydberg <rydberg@euromail.se>
+ *
+ * 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, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ **************************************************************************/
+
+#ifndef MTDEV_CAPS_H
+#define MTDEV_CAPS_H
+
+#include "common.h"
+
+struct Capabilities {
+        struct input_id devid;
+        char devname[32];
+        int has_left, has_middle;
+        int has_right, has_mtdata, has_ibt;
+        int has_touch_major, has_touch_minor;
+        int has_width_major, has_width_minor;
+        int has_orientation, has_dummy;
+        int has_position_x, has_position_y;
+        struct input_absinfo abs_touch_major;
+        struct input_absinfo abs_touch_minor;
+        struct input_absinfo abs_width_major;
+        struct input_absinfo abs_width_minor;
+        struct input_absinfo abs_orientation;
+        struct input_absinfo abs_position_x;
+        struct input_absinfo abs_position_y;
+        int xfuzz, yfuzz, wfuzz;
+        int yclick;
+};
+
+int read_capabilities(struct Capabilities *cap, int fd);
+int get_cap_xsize(const struct Capabilities *cap);
+int get_cap_ysize(const struct Capabilities *cap);
+int get_cap_wsize(const struct Capabilities *cap);
+
+int get_cap_xmid(const struct Capabilities *cap);
+int get_cap_ymid(const struct Capabilities *cap);
+
+void output_capabilities(const struct Capabilities *cap);
+
+#endif
diff --git a/include/mtdev-iobuf.h b/include/mtdev-iobuf.h
new file mode 100644
index 0000000..976b85b
--- /dev/null
+++ b/include/mtdev-iobuf.h
@@ -0,0 +1,37 @@
+/***************************************************************************
+ *
+ * Multitouch X driver
+ * Copyright (C) 2008 Henrik Rydberg <rydberg@euromail.se>
+ *
+ * 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, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ **************************************************************************/
+
+#ifndef MTDEV_IOBUF_H
+#define MTDEV_IOBUF_H
+
+#include "common.h"
+
+#define EVENT_SIZE sizeof(struct input_event)
+#define DIM_BUFFER (DIM_EVENTS * EVENT_SIZE)
+
+struct IOBuffer {
+        char begin[DIM_BUFFER], *at, *top, *end;
+};
+
+void init_iobuf(struct IOBuffer *buf);
+const struct input_event *get_iobuf_event(struct IOBuffer *buf, int fd);
+
+#endif
diff --git a/include/mtouch.h b/include/mtouch.h
new file mode 100644
index 0000000..a495960
--- /dev/null
+++ b/include/mtouch.h
@@ -0,0 +1,58 @@
+/***************************************************************************
+ *
+ * Multitouch X driver
+ * Copyright (C) 2008 Henrik Rydberg <rydberg@euromail.se>
+ *
+ * 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, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ **************************************************************************/
+
+#ifndef MTOUCH_H
+#define MTOUCH_H
+
+#include "mtdev-iobuf.h"
+#include "hwdata.h"
+#include "hwstate.h"
+#include "mtstate.h"
+#include "memory.h"
+
+struct MTouch {
+        struct Capabilities caps;
+        struct IOBuffer buf;
+        struct HWData hw;
+        struct HWState hs;
+        struct MTState prev_state, state;
+        struct Memory mem;
+};
+
+int configure_mtouch(struct MTouch *mt, int fd);
+int open_mtouch(struct MTouch *mt, int fd);
+int close_mtouch(struct MTouch *mt, int fd);
+
+int read_synchronized_event(struct MTouch *mt, int fd);
+void parse_event(struct MTouch *mt);
+
+
+static inline void mt_delay_movement(struct MTouch *mt, int t)
+{
+        mem_hold_movement(&mt->mem, mt->state.evtime + t);
+}
+
+static inline void mt_skip_movement(struct MTouch *mt, int t)
+{
+        mem_forget_movement(&mt->mem, mt->state.evtime + t);
+}
+
+#endif
diff --git a/include/mtstate.h b/include/mtstate.h
new file mode 100644
index 0000000..ac0b18d
--- /dev/null
+++ b/include/mtstate.h
@@ -0,0 +1,62 @@
+/***************************************************************************
+ *
+ * Multitouch X driver
+ * Copyright (C) 2008 Henrik Rydberg <rydberg@euromail.se>
+ *
+ * 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, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ **************************************************************************/
+
+#ifndef MTSTATE_H
+#define MTSTATE_H
+
+#include "hwstate.h"
+
+struct MTFinger {
+        struct FingerData hw;
+        int id, thumb;
+};
+
+struct MTState {
+        struct MTFinger finger[DIM_FINGER];
+        int nfinger;
+        unsigned button;
+        mstime_t evtime;
+};
+
+void init_mtstate(struct MTState *s);
+void extract_mtstate(struct MTState *s,
+                     const struct HWState *hs,
+                     const struct Capabilities *caps);
+void output_mtstate(const struct MTState *s);
+
+const struct MTFinger *find_finger(const struct MTState *s, int id);
+
+
+static inline int center_dist2(const struct MTFinger *a,
+                               const struct Capabilities *caps)
+{
+        return dist2(a->hw.position_x - get_cap_xmid(caps),
+                     a->hw.position_y - get_cap_ymid(caps));
+}
+
+static inline int center_maxdist2(const struct Capabilities *caps)
+{
+        return dist2(caps->abs_position_x.maximum - get_cap_xmid(caps),
+                     caps->abs_position_y.maximum - get_cap_ymid(caps));
+}
+
+#endif
+
diff --git a/include/xbypass.h b/include/xbypass.h
new file mode 100644
index 0000000..35c65e1
--- /dev/null
+++ b/include/xbypass.h
@@ -0,0 +1,13 @@
+#ifndef XBYPASS_H
+#define XBYPASS_H
+
+#include <stdarg.h>
+void xf86Msg(int type, const char *format, ...)
+{
+        va_list args;
+        va_start(args, format);
+        vfprintf(stderr, format, args);
+        va_end(args);
+}
+
+#endif