[PATCH v2 usb-next 2/4] USB: add USB_DEVICE_INTERFACE_CLASS macro

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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@xxxxxxx>
---
 include/linux/usb.h |   16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/include/linux/usb.h b/include/linux/usb.h
index f51f998..689b14b 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
-- 
1.7.10.4

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