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-rw-r--r--src/ps2comm.c11
1 files changed, 11 insertions, 0 deletions
diff --git a/src/ps2comm.c b/src/ps2comm.c
index 241f6a6..9d9e8a9 100644
--- a/src/ps2comm.c
+++ b/src/ps2comm.c
@@ -44,6 +44,17 @@
#include <xf86.h>
#define MAX_UNSYNC_PACKETS 10 /* i.e. 10 to 60 bytes */
+/*
+ * The x/y limits are taken from the Synaptics TouchPad interfacing Guide,
+ * section 2.3.2, which says that they should be valid regardless of the
+ * actual size of the sensor.
+ */
+#define XMIN_NOMINAL 1472
+#define XMAX_NOMINAL 5472
+#define YMIN_NOMINAL 1408
+#define YMAX_NOMINAL 4448
+
+#define XMAX_VALID 6143
/* synaptics queries */
#define SYN_QUE_IDENTIFY 0x00