[PATCH] USB: Patch to cdc-acm.c to detect ACM part of USB WMC devices

drivers/usb/class/cdc-acm.c

@@ -548,7 +548,7 @@ static int acm_probe (struct usb_interface *intf,
 	struct usb_host_config *cfacm;
 	struct usb_host_interface *ifcom, *ifdata;
 	struct usb_endpoint_descriptor *epctrl, *epread, *epwrite;
-	int readsize, ctrlsize, minor, i;
+	int readsize, ctrlsize, minor, i, j;
 	unsigned char *buf;
 
 	dev = interface_to_usbdev (intf);
@@ -558,23 +558,25 @@ static int acm_probe (struct usb_interface *intf,
 
 		dbg("probing config %d", cfacm->desc.bConfigurationValue);
 
-		if (cfacm->desc.bNumInterfaces != 2 ||
-		    usb_interface_claimed(cfacm->interface + 0) ||
-		    usb_interface_claimed(cfacm->interface + 1))
+		for (j = 0; j < cfacm->desc.bNumInterfaces - 1; j++) {
+		    
+			if (usb_interface_claimed(cfacm->interface + j) ||
+			    usb_interface_claimed(cfacm->interface + j + 1))
 			continue;
 
-		ifcom = cfacm->interface[0].altsetting + 0;
-		ifdata = cfacm->interface[1].altsetting + 0;
+			ifcom = cfacm->interface[j].altsetting + 0;
+			ifdata = cfacm->interface[j + 1].altsetting + 0;
 
 			if (ifdata->desc.bInterfaceClass != 10 || ifdata->desc.bNumEndpoints < 2) {
-			ifcom = cfacm->interface[1].altsetting + 0;
-			ifdata = cfacm->interface[0].altsetting + 0;
+				ifcom = cfacm->interface[j + 1].altsetting + 0;
+				ifdata = cfacm->interface[j].altsetting + 0;
 				if (ifdata->desc.bInterfaceClass != 10 || ifdata->desc.bNumEndpoints < 2)
 					continue;
 			}
 
 			if (ifcom->desc.bInterfaceClass != 2 || ifcom->desc.bInterfaceSubClass != 2 ||
-		    ifcom->desc.bInterfaceProtocol != 1 || ifcom->desc.bNumEndpoints < 1)
+			    ifcom->desc.bInterfaceProtocol < 1 || ifcom->desc.bInterfaceProtocol > 6 ||
+			    ifcom->desc.bNumEndpoints < 1)
 				continue;
 
 			epctrl = &ifcom->endpoint[0].desc;
@@ -608,7 +610,7 @@ static int acm_probe (struct usb_interface *intf,
 			ctrlsize = epctrl->wMaxPacketSize;
 			readsize = epread->wMaxPacketSize;
 			acm->writesize = epwrite->wMaxPacketSize;
-		acm->iface = cfacm->interface;
+			acm->iface = cfacm->interface + j;
 			acm->minor = minor;
 			acm->dev = dev;
 
@@ -673,6 +675,7 @@ static int acm_probe (struct usb_interface *intf,
 			usb_set_intfdata (intf, acm);
 			return 0;
 		}
+	}
 
 	return -EIO;
 }