[PATCH 08/15] Input: xpad: query Wireless controller state at init

[Pavel Rojtberg <rojtberg@gmail.com>]

From: Pavel Rojtberg <rojtberg@gmail.com>

When we initialize the driver/device, we really don't know how many
controllers are connected.  So send a "query presence" command to the
base-station. (Command discovered by Zachary Lund)

presence packet taken from:
https://github.com/computerquip/xpad5

Signed-off-by: Pavel Rojtberg <rojtberg@gmail.com>
---
 drivers/input/joystick/xpad.c | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/drivers/input/joystick/xpad.c b/drivers/input/joystick/xpad.c
index 43490ea..7d66d77 100644
--- a/drivers/input/joystick/xpad.c
+++ b/drivers/input/joystick/xpad.c
@@ -1236,6 +1236,30 @@ static int xpad_probe(struct usb_interface *intf, const struct usb_device_id *id
 			usb_kill_urb(xpad->irq_in);
 			goto fail4;
 		}
+
+		/*
+		 * send presence packet
+		 * This will force the controller to resend connection packets.
+		 * This is useful in the case we activate the module after the
+		 * adapter has been plugged in, as it won't automatically
+		 * send us info about the controllers.
+		 */
+		mutex_lock(&xpad->odata_mutex);
+		xpad->odata[0] = 0x08;
+		xpad->odata[1] = 0x00;
+		xpad->odata[2] = 0x0F;
+		xpad->odata[3] = 0xC0;
+		xpad->odata[4] = 0x00;
+		xpad->odata[5] = 0x00;
+		xpad->odata[6] = 0x00;
+		xpad->odata[7] = 0x00;
+		xpad->odata[8] = 0x00;
+		xpad->odata[9] = 0x00;
+		xpad->odata[10] = 0x00;
+		xpad->odata[11] = 0x00;
+		xpad->irq_out->transfer_buffer_length = 12;
+		usb_submit_urb(xpad->irq_out, GFP_KERNEL);
+		mutex_unlock(&xpad->odata_mutex);
 	}
 	xpad->pad_present = 1;
 	error = xpad_init_input(xpad);
-- 
1.9.1