/*  * This file is part of the UCB release of Plan 9. It is subject to the license * terms in the LICENSE file found in the top-level directory of this * distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No * part of the UCB release of Plan 9, including this file, may be copied, * modified, propagated, or distributed except according to the terms contained * in the LICENSE file. */ /* * Standard usb ethernet communications device. */#include <u.h>#include <libc.h>#include <fcall.h>#include <thread.h>#include "usb.h"#include "usbfs.h"#include "ether.h" static intokclass(Iface *iface){	return Class(iface->csp) == Clcomms && Subclass(iface->csp) == Scether;} static intgetmac(Ether *ether){	int i;	Usbdev *ud;	uchar *b;	Desc *dd;	char *mac; 	ud = ether->dev->usb; 	for(i = 0; i < nelem(ud->ddesc); i++)		if((dd = ud->ddesc[i]) != nil && okclass(dd->iface)){			b = (uchar*)&dd->data;			if(b[1] == Dfunction && b[2] == Fnether){				mac = loaddevstr(ether->dev, b[3]);				if(mac != nil && strlen(mac) != 12){					free(mac);					mac = nil;				}				if(mac != nil){					parseaddr(ether->addr, mac);					free(mac);					return 0;				}			}		}	return -1;} intcdcreset(Ether *ether){	/*	 * Assume that all communication devices are going to	 * be std. ethernet communication devices. Specific controllers	 * must have been probed first.	 * NB: This ignores unions.	 */	if(ether->dev->usb->class == Clcomms)		return getmac(ether);	return -1;}