USB: add USB_DEVICE_INTERFACE_CLASS macro

Matching on device and interface class with with unspecified
subclass and protocol is sometimes useful.  This is slightly
different from USB_DEVICE_AND_INTERFACE_INFO which requires
the full interface class/subclass/protocol triplet.

Signed-off-by: Bjørn Mork <bjorn@mork.no>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 16 insertions, 0 deletions

diff --git a/include/linux/usb.h b/include/linux/usb.h
index f51f9981de1e..689b14b26c8d 100644
--- a/include/linux/usb.h
+++ b/include/linux/usb.h
@@ -808,6 +808,22 @@ static inline int usb_make_path(struct usb_device *dev, char *buf, size_t size)
         .bcdDevice_hi = (hi)
 
 /**
+ * USB_DEVICE_INTERFACE_CLASS - describe a usb device with a specific interface class
+ * @vend: the 16 bit USB Vendor ID
+ * @prod: the 16 bit USB Product ID
+ * @cl: bInterfaceClass value
+ *
+ * This macro is used to create a struct usb_device_id that matches a
+ * specific interface class of devices.
+ */
+#define USB_DEVICE_INTERFACE_CLASS(vend, prod, cl) \
+        .match_flags = USB_DEVICE_ID_MATCH_DEVICE | \
+                       USB_DEVICE_ID_MATCH_INT_CLASS, \
+        .idVendor = (vend), \
+        .idProduct = (prod), \
+        .bInterfaceClass = (cl)
+
+/**
  * USB_DEVICE_INTERFACE_PROTOCOL - describe a usb device with a specific interface protocol
  * @vend: the 16 bit USB Vendor ID
  * @prod: the 16 bit USB Product ID