linux-kernel - Re: [PATCH] Input: xpad - remove spurious events of wireless xpad 360 controller

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Date:	Sun, 22 Nov 2015 17:26:14 +0100
From:	Clément Calmels <clement.calmels@...e.fr>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Input: xpad - remove spurious events of wireless xpad
 360 controller

On Sun,  1 Nov 2015 21:26:11 +0100
clement.calmels@...e.fr wrote:

> From: Clement Calmels <clement.calmels@...e.fr>
> 
> 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 connects, 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.@..... According to xboxdrv:
> https://github.com/xboxdrv/xboxdrv/blob/stable/src/xbox360_wireless_controller.cpp#L118
> this packet is only dumping a serial id and should not be interpreted
> as joystick events.
> 
> This issue can be easily seen with: $ 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@...e.fr>
> ---
>  drivers/input/joystick/xpad.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/input/joystick/xpad.c
> b/drivers/input/joystick/xpad.c index f8850f9..68e5bd3 100644
> --- a/drivers/input/joystick/xpad.c
> +++ b/drivers/input/joystick/xpad.c
> @@ -523,7 +523,7 @@ static void xpad360w_process_packet(struct
> usb_xpad *xpad, u16 cmd, unsigned cha }
>  
>  	/* Valid pad data */
> -	if (!(data[1] & 0x1))
> +	if (!(data[1] & 0x1) || data[1] == 0xf)
>  		return;
>  
>  	xpad360_process_packet(xpad, cmd, &data[4]);

After more tests, the 'if' statement can be simplified.
I will send a second version of this patch.

c.
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