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nusb/joy: support shanwan controllers in xbox360 mode

usb controllers made by shanwan need some extra initialization to work in
xbox360 mode. the linux xpad driver does the same. this was tested by
user hardkorebob on irc.

--- a/sys/src/cmd/nusb/joy/joy.c

+++ b/sys/src/cmd/nusb/joy/joy.c

@@ -453,7 +453,14 @@

 		0xc0,

 	};

 	static uchar ledcmd[] = {1,3,0};

+	uchar b[20];

 	Dev *d = kd->dev;

+

+	if(cistrcmp("shanwan", d->usb->vendor) == 0){

+		usbcmd(d, Rd2h|Rvendor|Riface, 0x01, 0x100, 0, b, 20);

+		usbcmd(d, Rd2h|Rvendor|Riface, 0x01, 0, 0, b, 8);

+		usbcmd(d, Rd2h|Rvendor|Rdev, 0x01, 0, 0, b, 4);

+	}

 	memcpy(kd->rep, descr, kd->nrep = sizeof(descr));

 	/* no blinken lights */

-- 

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