Input: xpad - remove spurious events of wireless xpad 360 controller

When powering up a wireless xbox 360 controller, some wrong joystick
events are generated. It is annoying because, for example, it makes
unwanted moves in Steam big picture mode's menu.

When my controller is powering up, this packet is received by the
driver:
00000000: 00 0f 00 f0 00 cc ff cf 8b e0 86 6a 68 f0 00 20  ...........jh..
00000010: 13 e3 20 1d 30 03 40 01 50 01 ff ff              .. .0.@.P...

According to xboxdrv userspace driver source code, this packet is only
dumping a serial id and should not be interpreted as joystick events.
This issue can be easily seen with jstest:
$ jstest --event /dev/input/js0

This patch only adds a way to filter out this "serial" packet and as a
result it removes the spurous events.

Signed-off-by: Clement Calmels <clement.calmels@free.fr>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

diff --git a/drivers/input/joystick/xpad.c b/drivers/input/joystick/xpad.c
index fd4100d56d8c5509986be23e40d2af137cd840b1..c44cbd40f3faf5f89b7c1f827056d3f48f249fe1 100644 (file)
--- a/drivers/input/joystick/xpad.c
+++ b/drivers/input/joystick/xpad.c
@@ -527,7 +527,7 @@ static void xpad360w_process_packet(struct usb_xpad *xpad, u16 cmd, unsigned cha
        }
 
        /* Valid pad data */
-       if (!(data[1] & 0x1))
+       if (data[1] != 0x1)
                return;
 
        xpad360_process_packet(xpad, cmd, &data[4]);