linux-kernel - Re: [PATCH] Input: xpad - use LED API when identifying wireless controllers

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Date:	Sat, 19 Dec 2015 22:17:09 +0100
From:	Clement Calmels <clement.calmels@...e.fr>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:	linux-input@...r.kernel.org, Pavel Rojtberg <rojtberg@...il.com>,
	"Pierre-Loup A. Griffais" <githubpublic@...gman.net>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Input: xpad - use LED API when identifying wireless
 controllers

On Wed, 16 Dec 2015 14:44:08 -0800
Dmitry Torokhov <dmitry.torokhov@...il.com> wrote:

> When lighting up the segment identifying wireless controller, Instead
> of sending command directly to the controller, let's do it via LED
> API (usinf led_set_brightness) so that LED object state is in sync
> with controller state and we'll light up the correct segment on
> resume as well.
> 
> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@...il.com>
> ---
> 
> I do not have the hardware so please try this out.
> 
>  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 36328b3..00a766b 100644
> --- a/drivers/input/joystick/xpad.c
> +++ b/drivers/input/joystick/xpad.c
> @@ -1118,7 +1118,7 @@ static void xpad_send_led_command(struct
> usb_xpad *xpad, int command) */
>  static void xpad_identify_controller(struct usb_xpad *xpad)
>  {
> -	xpad_send_led_command(xpad, (xpad->pad_nr % 4) + 2);
> +	led_set_brightness(&xpad->led->led_cdev, (xpad->pad_nr % 4)
> + 2); }
>  
>  static void xpad_led_set(struct led_classdev *led_cdev,

Hi Dimitri,

My hardware: two wireless xpad 360 using a single usb receiver.

Power on the first gamepad => light the "1" led.
Power on the second gamepad => light the "2" led.

Suspend the PC (systemctl suspend): the two gamepads are "disconnected"
=> blinking circle.

Resume the PC, the two gamepads keep blinking but are working (tested
with jstest).

Power off and on the gamepad => still blinking.
Reload (rmmod/modprobe) the xpad module => still blinking.

That said, without your patch, the behavior is exactly the same.
It seems that the suspend/resume broke the led feature. Even using
the /sys/class/leds/xpad0/brigthness sysfs entry does not work.

Best regards,
Clement
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