adds a timeout ctl request now used by the disk and the serial drivers.

Reference: /n/sources/patch/applied/devusbtimeoutctl
Date: Fri Jul 24 12:09:42 CES 2009
Signed-off-by: nemo@lsub.org

--- /sys/src/9/pc/devusb.c	Fri Jul 24 12:08:47 2009
+++ /sys/src/9/pc/devusb.c	Fri Jul 24 12:08:43 2009
@@ -89,6 +89,7 @@
 	CMaddress,		/* address (address is assigned) */
 	CMdebugep,		/* debug n (set/clear debug for this ep) */
 	CMname,			/* name str (show up as #u/name as well) */
+	CMtmout,		/* timeout n (activate timeouts for ep) */
 
 	/* Hub feature selectors */
 	Rportenable	= 1,
@@ -132,6 +133,7 @@
 	{CMdebugep,	"debug",	2},
 	{CMclrhalt,	"clrhalt",	1},
 	{CMname,	"name",		2},
+	{CMtmout,	"timeout",	2},
 };
 
 static Dirtab usbdir[] =
@@ -303,6 +305,8 @@
 		s = seprint(s, se, " idx %d", ep->idx);
 		if(ep->name != nil)
 			s = seprint(s, se, " name '%s'", ep->name);
+		if(ep->tmout != 0)
+			s = seprint(s, se, " tmout");
 		if(ep == ep->ep0){
 			s = seprint(s, se, " ctlrno %#x", ep->hp->ctlrno);
 			s = seprint(s, se, " eps:");
@@ -467,6 +471,7 @@
 	ep->dev = d;
 	ep->ep0 = ep;			/* no ref counted here */
 	ep->ttype = Tctl;
+	ep->tmout = Xfertmout;
 	ep->mode = ORDWR;
 	dprint("newdev %#p ep%d.%d %#p\n", d, d->nb, ep->nb, ep);
 	return ep;
@@ -495,11 +500,20 @@
 	nep->mode = mode;
 	nep->ttype = tt;
 	nep->debug = ep->debug;
-	if(tt == Tintr || tt == Tiso)	/* assign defaults */
+	/* set defaults */
+	switch(tt){
+	case Tctl:
+		nep->tmout = Xfertmout;
+		break;
+	case Tintr:
+		nep->pollival = 10;
+		break;
+	case Tiso:
+		nep->tmout = Xfertmout;
 		nep->pollival = 10;
-	if(tt == Tiso){
 		nep->samplesz = 4;
 		nep->hz = 44100;
+		break;
 	}
 	deprint("newdevep ep%d.%d %#p\n", d->nb, nep->nb, nep);
 	return ep;
@@ -1297,8 +1311,16 @@
 		validname(cb->f[1], 0);
 		kstrdup(&ep->name, cb->f[1]);
 		break;
+	case CMtmout:
+		deprint("usb epctl %s\n", cb->f[0]);
+		if(ep->ttype == Tiso || ep->ttype == Tctl)
+			error("ctl ignored for this endpoint type");
+		ep->tmout = strtoul(cb->f[1], nil, 0);
+		if(ep->tmout != 0 && ep->tmout < Xfertmout)
+			ep->tmout = Xfertmout;
+		break;
 	default:
-		panic("usb: unknown epctl %d", ct->index);
+		panic("usb: unknown epctl %d\n", ct->index);
 	}
 	free(cb);
 	poperror();