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nusb/kb: add support for evoluent vertical mouse

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

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

@@ -222,11 +222,18 @@

 	close(fd);

 }

+static short

+s16(void *p)

+{

+	uchar *b = p;

+	return b[0] | b[1]<<8;

+}

+

 static void

 ptrwork(void* a)

 {

 	static char maptab[] = {0x0, 0x1, 0x4, 0x5, 0x2, 0x3, 0x6, 0x7};

-	int x, y, b, c, nerrs, skiplead;

+	int x, y, z, b, c, nerrs, skiplead;

 	char	err[ERRMAX], buf[64];

 	char	mbuf[80];

 	KDev*	f = a;

@@ -272,20 +279,27 @@

 				skiplead = 0;

 		}

-		if(f->accel){

-			x = scale(f, buf[1]);

-			y = scale(f, buf[2]);

-		}else{

+		z = 0;

+		if(c == 6 && f->dev->usb->vid == 0x1a7c){

+			/* Evoluent vertical mouse */

+			x = s16(&buf[1]);

+			y = s16(&buf[3]);

+			z = buf[5];

+		} else {

 			x = buf[1];

 			y = buf[2];

+			if(c > 3)

+				z = buf[3];

 		}

+		if(f->accel){

+			x = scale(f, x);

+			y = scale(f, y);

+		}

 		b = maptab[buf[0] & 0x7];

-		if(c > 3 && buf[3] > 0){	/* up */

+		if(z > 0)	/* up */

 			b |= 0x08;

-		}

-		if(c > 3 && buf[3] < 0){	/* down */

+		if(z < 0)	/* down */

 			b |= 0x10;

-		}

 		if(kbdebug > 1)

 			fprint(2, "%s: m%11d %11d %11d\n", argv0, x, y, b);

 		seprint(mbuf, mbuf+sizeof(mbuf), "m%11d %11d %11d", x, y,b);