The following reply was made to PR usb/183505; it has been noted by GNATS.

From: Adrian Chadd <adr...@freebsd.org>
To: Mike Meyer <m...@mired.org>
Cc: "bug-follo...@freebsd.org" <bug-follo...@freebsd.org>
Subject: Re: usb/183505: [usb] Arduino Leonardo exposes three interface
 descriptors but no modem is attached to the first one (bInterfaceSubClass=2)
Date: Wed, 30 Oct 2013 17:58:23 -0700

 Here's a patch that fixes it:
 
 
 ===
 
 adrian@lucy-11i386:~/work/freebsd/head/src % svn diff sys/dev/usb
 Index: sys/dev/usb/serial/umodem.c
 ===================================================================
 --- sys/dev/usb/serial/umodem.c (revision 257371)
 +++ sys/dev/usb/serial/umodem.c (working copy)
 @@ -128,6 +128,9 @@
         {USB_IFACE_CLASS(UICLASS_CDC),
                 USB_IFACE_SUBCLASS(UISUBCLASS_ABSTRACT_CONTROL_MODEL),
                 USB_IFACE_PROTOCOL(UIPROTO_CDC_AT)},
 +       {USB_IFACE_CLASS(UICLASS_CDC),
 +               USB_IFACE_SUBCLASS(UISUBCLASS_ABSTRACT_CONTROL_MODEL),
 +               USB_IFACE_PROTOCOL(UIPROTO_CDC_NONE)},
         /* Huawei Modem class match */
         {USB_IFACE_CLASS(UICLASS_CDC),
                 USB_IFACE_SUBCLASS(UISUBCLASS_ABSTRACT_CONTROL_MODEL),
 Index: sys/dev/usb/usb.h
 ===================================================================
 --- sys/dev/usb/usb.h   (revision 257371)
 +++ sys/dev/usb/usb.h   (working copy)
 @@ -441,6 +441,7 @@
  #define        UISUBCLASS_ETHERNET_EMULATION_MODEL 12
  #define        UISUBCLASS_NETWORK_CONTROL_MODEL 13
 
 +#define        UIPROTO_CDC_AT                  0
  #define        UIPROTO_CDC_AT                  1
 
  #define        UICLASS_HID             0x03
 
 ===
 
 Reading the spec,
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