commit 67f56bb0f4997b55291c162077e02e4f29639fc2
author Daniel Drake <dsd@laptop.org> Mon Nov 15 01:28:54 2010 -0800
committer Dmitry Torokhov <dmitry.torokhov@gmail.com> Mon Nov 15 01:33:47 2010 -0800
tree b12990c21c48da67a642410888c5e823e2b2f172
parent 87abb6bbdbcfbced2ce0bcad68dd89ac3ff9464b

Input: hgpk - detect simple mode overflows

Based on work by Paul Fox.

Signed-off-by: Daniel Drake <dsd@laptop.org>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

drivers/input/mouse/hgpk.c

diff --git a/drivers/input/mouse/hgpk.c b/drivers/input/mouse/hgpk.c
index b54f074..7f6cb32 100644
--- a/drivers/input/mouse/hgpk.c
+++ b/drivers/input/mouse/hgpk.c
@@ -431,6 +431,11 @@
 	int x = packet[1] - ((packet[0] << 4) & 0x100);
 	int y = ((packet[0] << 3) & 0x100) - packet[2];
 
+	if (packet[0] & 0xc0)
+		hgpk_dbg(psmouse,
+			 "overflow -- 0x%02x 0x%02x 0x%02x\n",
+			 packet[0], packet[1], packet[2]);
+
 	if (hgpk_discard_decay_hack(psmouse, x, y)) {
 		if (tpdebug)
 			hgpk_dbg(psmouse, "discarding\n");