[PATCH] USB: Add optional match for interface class to dynamic ID facility

[Josua Dietze <digidietze@xxxxxxxxxxxxxxx>]

When adding the ID of a composite device dynamically to a driver, all hitherto 
unbound interfaces are bound to this driver which is often not intended.
The patch adds the option to tell the targeted interface class to a driver, in 
addition to the device ID.

Example:
$ echo "1234 2a2a ff" >/sys/bus/usb-serial/drivers/generic/new_id
will bind only vendor-specific interfaces to usbserial.

Signed-off-by: Josua Dietze <digidietze@xxxxxxxxxxxxxxx>

-------

--- linux-3.0.4/drivers/usb/core/driver.c.orig	2011-07-22 04:17:23.000000000 +0200
+++ linux-3.0.4/drivers/usb/core/driver.c	2011-10-21 22:34:00.000000000 +0200
@@ -44,10 +44,11 @@ ssize_t usb_store_new_id(struct usb_dyni
 	struct usb_dynid *dynid;
 	u32 idVendor = 0;
 	u32 idProduct = 0;
+	unsigned int bInterfaceClass = 0;
 	int fields = 0;
 	int retval = 0;

-	fields = sscanf(buf, "%x %x", &idVendor, &idProduct);
+	fields = sscanf(buf, "%x %x %x", &idVendor, &idProduct, &bInterfaceClass);
 	if (fields < 2)
 		return -EINVAL;

@@ -58,7 +59,11 @@ ssize_t usb_store_new_id(struct usb_dyni
 	INIT_LIST_HEAD(&dynid->node);
 	dynid->id.idVendor = idVendor;
 	dynid->id.idProduct = idProduct;
-	dynid->id.match_flags = USB_DEVICE_ID_MATCH_DEVICE;
+	if (fields == 3) {
+		dynid->id.bInterfaceClass = (u8)bInterfaceClass;
+		dynid->id.match_flags = USB_DEVICE_ID_MATCH_DEVICE | 
USB_DEVICE_ID_MATCH_INT_CLASS;
+	} else
+		dynid->id.match_flags = USB_DEVICE_ID_MATCH_DEVICE;

 	spin_lock(&dynids->lock);
 	list_add_tail(&dynid->node, &dynids->list);
--
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