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nusb/kb: poor man's rotate -90° to landscape mode for generic usb tablet

--- /dev/null

+++ b/nusb-kb-rotate

@@ -1,0 +1,19 @@

+diff 62253b9d1720fb3ce962a5a6b2bdf5588267be8a uncommitted

+--- a//sys/src/cmd/nusb/kb/kb.c

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

+@@ -867,8 +867,13 @@

+ 				if(s->abs == l->abs && s->x == l->x && s->y == l->y && s->b == l->b)

+ 					continue;

+ 				abs = 1;

+-				x = s->x;

+-				y = s->y;

++				if(f->dev->usb->vid == 0x28bd && f->dev->usb->did == 0x0920){

++					x = s->y;

++					y = 0x80000000UL - s->x;

++				}else{

++					x = s->x;

++					y = s->y;

++				}

+ 			} else {

+ 				/* everything needs to be relative */

+ 				if((s->abs & 3) != 0 || abs)