1 files changed, 128 insertions, 0 deletions

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