USB: cdc-acm: Add pseudo modem without AT command capabilities

commit 5b239f0aebd4dd6f85b13decf5e18e86e35d57f0 upstream.

cdc-acm.c : Manage pseudo-modem without AT commands capabilities
  Enable to drive electronic simple gadgets based on microcontrolers.
  The Interface descriptor is like this:
    bInterfaceClass         2 Communications
    bInterfaceSubClass      2 Abstract (modem)
    bInterfaceProtocol      0 None

Signed-off-by: Philippe Corbes <philippe.corbes@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/usb/class/cdc-acm.c b/drivers/usb/class/cdc-acm.c
index e5aea78b053d2041bfe240f2072bc76e34f9119e..fd3aec7280a05f6f66e9ad7df18ed7ea5455878f 100644 (file)
--- a/drivers/usb/class/cdc-acm.c
+++ b/drivers/usb/class/cdc-acm.c
@@ -1599,6 +1599,10 @@ static struct usb_device_id acm_ids[] = {
 
        /* NOTE: non-Nokia COMM/ACM/0xff is likely MSFT RNDIS... NOT a modem! */
 
+       /* control interfaces without any protocol set */
+       { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
+               USB_CDC_PROTO_NONE) },
+
        /* control interfaces with various AT-command sets */
        { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
                USB_CDC_ACM_PROTO_AT_V25TER) },