linux-kernel - [PATCH 3.18 23/83] Input: xpad - re-send LED command on present event

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Date:   Thu, 29 Nov 2018 15:11:41 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Pavel Rojtberg <rojtberg@...il.com>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 3.18 23/83] Input: xpad - re-send LED command on present event

3.18-stable review patch.  If anyone has any objections, please let me know.

------------------

[ Upstream commit cae705baa40b2c20de8f9bb79ef4bcc6b2418c7c ]

The controller only receives commands when its present. So for the
correct LED to be lit the LED command has to be sent on the present
event.

Signed-off-by: Pavel Rojtberg <rojtberg@...il.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@...il.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/input/joystick/xpad.c | 28 ++++++++++++++++++++--------
 1 file changed, 20 insertions(+), 8 deletions(-)

diff --git a/drivers/input/joystick/xpad.c b/drivers/input/joystick/xpad.c
index 5606e66ca5a5..a66720136290 100644
--- a/drivers/input/joystick/xpad.c
+++ b/drivers/input/joystick/xpad.c
@@ -346,6 +346,7 @@ struct usb_xpad {
 
 	int mapping;			/* map d-pad to buttons or to axes */
 	int xtype;			/* type of xbox device */
+	unsigned long led_no;		/* led to lit on xbox360 controllers */
 };
 
 /*
@@ -490,6 +491,8 @@ static void xpad360_process_packet(struct usb_xpad *xpad,
 	input_sync(dev);
 }
 
+static void xpad_identify_controller(struct usb_xpad *xpad);
+
 /*
  * xpad360w_process_packet
  *
@@ -512,6 +515,11 @@ static void xpad360w_process_packet(struct usb_xpad *xpad, u16 cmd, unsigned cha
 		if (data[1] & 0x80) {
 			xpad->pad_present = 1;
 			usb_submit_urb(xpad->bulk_out, GFP_ATOMIC);
+			/*
+			 * Light up the segment corresponding to
+			 * controller number.
+			 */
+			xpad_identify_controller(xpad);
 		} else
 			xpad->pad_present = 0;
 	}
@@ -936,6 +944,12 @@ static void xpad_send_led_command(struct usb_xpad *xpad, int command)
 	mutex_unlock(&xpad->odata_mutex);
 }
 
+static void xpad_identify_controller(struct usb_xpad *xpad)
+{
+	/* Light up the segment corresponding to controller number */
+	xpad_send_led_command(xpad, (xpad->led_no % 4) + 2);
+}
+
 static void xpad_led_set(struct led_classdev *led_cdev,
 			 enum led_brightness value)
 {
@@ -947,8 +961,7 @@ static void xpad_led_set(struct led_classdev *led_cdev,
 
 static int xpad_led_probe(struct usb_xpad *xpad)
 {
-	static atomic_t led_seq	= ATOMIC_INIT(-1);
-	unsigned long led_no;
+	static atomic_t led_seq = ATOMIC_INIT(-1);
 	struct xpad_led *led;
 	struct led_classdev *led_cdev;
 	int error;
@@ -960,9 +973,9 @@ static int xpad_led_probe(struct usb_xpad *xpad)
 	if (!led)
 		return -ENOMEM;
 
-	led_no = atomic_inc_return(&led_seq);
+	xpad->led_no = atomic_inc_return(&led_seq);
 
-	snprintf(led->name, sizeof(led->name), "xpad%lu", led_no);
+	snprintf(led->name, sizeof(led->name), "xpad%lu", xpad->led_no);
 	led->xpad = xpad;
 
 	led_cdev = &led->led_cdev;
@@ -976,10 +989,8 @@ static int xpad_led_probe(struct usb_xpad *xpad)
 		return error;
 	}
 
-	/*
-	 * Light up the segment corresponding to controller number
-	 */
-	xpad_send_led_command(xpad, (led_no % 4) + 2);
+	/* Light up the segment corresponding to controller number */
+	xpad_identify_controller(xpad);
 
 	return 0;
 }
@@ -996,6 +1007,7 @@ static void xpad_led_disconnect(struct usb_xpad *xpad)
 #else
 static int xpad_led_probe(struct usb_xpad *xpad) { return 0; }
 static void xpad_led_disconnect(struct usb_xpad *xpad) { }
+static void xpad_identify_controller(struct usb_xpad *xpad) { }
 #endif
 
 
-- 
2.17.1