HID: sony: Drop invalid Sixaxis input reports
When connected via Bluetooth the sixaxis periodically sends reports with an ID
of 1, the second byte 0xff and the rest zeroed. These reports are not related
to the controller state and must be dropped to avoid generating false input
events.
Link: http://www.spinics.net/lists/linux-bluetooth/msg63028.html
Signed-off-by: Frank Praznik <frank.praznik@oh.rr.com>
Signed-off-by: Jiri Kosina <jkosina@suse.com>
diff --git a/drivers/hid/hid-sony.c b/drivers/hid/hid-sony.c
index 69586b3..ed0496a 100644
--- a/drivers/hid/hid-sony.c
+++ b/drivers/hid/hid-sony.c
@@ -1277,6 +1277,17 @@
* has to be BYTE_SWAPPED before passing up to joystick interface
*/
if ((sc->quirks & SIXAXIS_CONTROLLER) && rd[0] == 0x01 && size == 49) {
+ /*
+ * When connected via Bluetooth the Sixaxis occasionally sends
+ * a report with the second byte 0xff and the rest zeroed.
+ *
+ * This report does not reflect the actual state of the
+ * controller must be ignored to avoid generating false input
+ * events.
+ */
+ if (rd[1] == 0xff)
+ return -EINVAL;
+
swap(rd[41], rd[42]);
swap(rd[43], rd[44]);
swap(rd[45], rd[46]);
