[SUGGESTION] Add generic modem without AT command capabilities

[Philippe Corbes <philippe.corbes@xxxxxxxxx>]

Hello,

I founded electronic gadgets based on microcontrolers. They configured
the Interface descriptor as:
      bInterfaceClass         2 Communications
      bInterfaceSubClass      2 Abstract (modem)
      bInterfaceProtocol      0 None

I think it would be interesting to manage this kind of peripheral. We
should not specify "1 AT-commands (v.25ter)" when the node do not
support AT commands.
Does anybody have another idea?

I suggest this modification in class/cdc-acm.c
1597         /* Support Lego NXT using pbLua firmware */
1598         { USB_DEVICE(0x0694, 0xff00),
1599         .driver_info = NOT_A_MODEM,
1600         },
1601
             /* control interfaces without any protocol sets */
             { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
                 USB_CDC_PROTO_NONE) },

1602         /* control interfaces with various AT-command sets */
1603         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1604                 USB_CDC_ACM_PROTO_AT_V25TER) },
1605         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1606                 USB_CDC_ACM_PROTO_AT_PCCA101) },

Philippe Corbes
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