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nusb/lib: provide a setalt() function to set the interface to its altsetting

--- a/sys/src/cmd/nusb/lib/dev.c

+++ b/sys/src/cmd/nusb/lib/dev.c

@@ -482,6 +482,16 @@

 	return 0;

 }

+int

+setalt(Dev *d, Iface *ifc)

+{

+	if(usbcmd(d, Rh2d|Rstd|Riface, Rsetiface, ifc->alt, ifc->id, nil, 0) < 0){

+		werrstr("setalt: %s: %r", d->dir);

+		return -1;

+	}

+	return 0;

+}

+

 /*

  * To be sure it uses a single write.

  */

--- a/sys/src/cmd/nusb/lib/usb.h

+++ b/sys/src/cmd/nusb/lib/usb.h

@@ -353,5 +353,6 @@

 int	unstall(Dev *dev, Dev *ep, int dir);

 int	usbcmd(Dev *d, int type, int req, int value, int index, uchar *data, int count);

 Dev*	getdev(char *devid);

+int	setalt(Dev *d, Iface *ifc);

 extern int usbdebug;	/* more messages for bigger values */