diff 86e3e0791c239bbaaece242cf78fa56794b58a72 uncommitted
--- a/sys/src/cmd/nusb/kb/hid.h
+++ b/sys/src/cmd/nusb/kb/hid.h
@@ -24,7 +24,8 @@
 	Reportproto	= 1,
 
 	/* protocols for SET_REPORT request */
-	Reportout = 0x0200,
+	Reportout		= 0x0200,
+	Reportfeature	= 0x0300,
 };
 
 /*
--- a/sys/src/cmd/nusb/kb/kb.c
+++ b/sys/src/cmd/nusb/kb/kb.c
@@ -68,6 +68,8 @@
 	int	y;
 	int	z;
 
+	int pr;	/* stylus pressure */
+
 	int	b;
 	int	m;
 
@@ -657,6 +659,12 @@
 				s->abs |= 4;
 			s->z = v;
 			break;
+		case 0x0D0030:	/* Tip Pressure */
+			if((f & (Fabs|Frel)) == Fabs){
+				v = ((vlong)(v - g[LogiMin]) << 31) / (g[LogiMax] - g[LogiMin]);
+				s->pr = v;
+			}
+			break;
 		}
 		s->valid = 1;
 	}
@@ -687,13 +695,17 @@
 	return nil;
 }
 
+enum {
+	PrThreshold	= (int)(((vlong)1<<31)/20),	/* 5% of max int */
+};
+
 static void
 readerproc(void* a)
 {
 	char	err[ERRMAX], mbuf[80];
 	ushort	lastk[Nkey], uks[Nkey], dks[Nkey], nuks, ndks;
-	int	i, c, bpress, lastb, nlastk, stopped;
-	int	abs, x, y, z, b;
+	int	i, c, bpress, lastb, nlastk, stopped, prbias;
+	int	abs, x, y, z, b, pr;
 	Hidreport p;
 	Hidslot lasts[nelem(p.s)], *s, *l;
 	Hiddev *f = a;
@@ -704,6 +716,7 @@
 	memset(&p, 0, sizeof(p));
 	memset(lasts, 0, sizeof(lasts));
 	lastb = nlastk = 0;
+	prbias = -1;
 
 	for(;;){
 		if(f->ep == nil)
@@ -789,8 +802,10 @@
 		}
 
 		/* handle mouse/touchpad */
-		if(p.ns == 0)
+		if(p.ns == 0){
+			prbias = -1; /* reset pressure baseline */
 			continue;
+		}
 
 		/* combine all the slots */
 		bpress = abs = x = y = z = b = 0;
@@ -829,6 +844,15 @@
 				b |= 4;
 			bpress |= s->m;
 
+			/* stylus pressure */
+			pr = s->pr;
+			if(prbias < 0 || pr < prbias)
+				prbias = pr;
+			bpress |= 1;
+			if(pr - prbias > PrThreshold){
+				b |= 1;
+			}
+
 			/* X/Y are absolute? */
 			if((s->abs & 3) == 3){
 				/* ignore absolute position when nothing changed */
@@ -928,6 +952,59 @@
 }
 
 static void
+wacommte450(Hiddev *f)
+{
+	static uchar descr[] = {
+		0x05, 0x0D,	/* Usage Page (Digitizer),	*/
+		0x09, 0x01,	/* Usage (Digitizer),		*/
+		0xA1, 0x01,	/* Collection (Application),	*/
+		0x85, 0x02,	/* Report ID (2),		*/
+		0x09, 0x20,	/* Usage (Stylus),		*/
+		0xA0,		/* Collection (Physical),	*/
+		0x75, 0x04,	/*	Report Size (4),	*/
+		0x95, 0x01,	/*	Report Count (1),	*/
+		0x81, 0x03,	/*	Input (Constant, Variable), */
+		0x14,		/*	Logical Minimum (0),	*/
+		0x25, 0x01,	/*	Logical Maximum (1),	*/
+		0x75, 0x01,	/*	Report Size (1),	*/
+		0x09, 0x32,	/*	Usage (In Range),	*/
+		0x95, 0x01,	/*	Report Count (1),	*/
+		0x81, 0x02,	/*	Input (Variable),	*/
+		0x75, 0x03,	/*	Report Size (3),	*/
+		0x95, 0x01,	/*	Report Count (1),	*/
+		0x81, 0x03,	/*	Input (Constant, Variable), */
+		0xA4,		/*	Push,			*/
+		0x05, 0x01,	/*	Usage Page (Desktop),	*/
+		0x65, 0x13,	/*	Unit (Inch),		*/
+		0x55, 0xFD,	/*	Unit Exponent (-3),	*/
+		0x75, 0x10,	/*	Report Size (16),	*/
+		0x95, 0x01,	/*	Report Count (1),	*/
+		0x09, 0x30,	/*	Usage (X),		*/
+		0x26, 0xA8, 0x39,	/*	Logical Maximum, */
+		0x81, 0x02,	/*	Input (Variable),	*/
+		0x09, 0x31,	/*	Usage (Y),		*/
+		0x26, 0x09, 0x24,	/*	Logical Maximum, */
+		0x81, 0x02,	/*	Input (Variable),	*/
+		0xB4,		/*	Pop,			*/
+		0x09, 0x30,	/*	Usage (Tip Pressure),	*/
+		0x75, 0x10,	/*	Report Size (16),	*/
+		0x26, 0xFF, 0x01,	/*	Logical Maximum, */
+		0x81, 0x02,	/*	Input (Variable),	*/
+		0xC0,		/* End Collection,		*/
+		0xC0		/* End Collection		*/
+	};
+	static uchar req[] = { 0x02, 0x02 };
+	Dev *d = f->dev;
+
+	/* switch to mode 2 */
+	if(usbcmd(d, Rh2d|Rclass|Riface, Setreport, Reportfeature|0x02, 0, req, sizeof(req)) < 0)
+		hdfatal(f, "failed to initialize wacom mte-450");
+
+	/* override report descriptor */
+	memmove(f->rep, descr, f->nrep = sizeof(descr));
+}
+
+static void
 quirks(Hiddev *f)
 {
 	Dev *d;
@@ -956,6 +1033,11 @@
 		f->rep[13] = 8;
 		f->rep[21] = 8;
 		f->rep[31] = 0;
+		return;
+	}
+
+	if(d->usb->vid == 0x056a && d->usb->did == 0x0065){
+		wacommte450(f);
 		return;
 	}
 }