2 files changed, 32 insertions, 1 deletions

diff --git a/Documentation/ABI/testing/sysfs-bus-usb b/Documentation/ABI/testing/sysfs-bus-usb
index e647378e9e88..b4f548792e32 100644
--- a/Documentation/ABI/testing/sysfs-bus-usb
+++ b/Documentation/ABI/testing/sysfs-bus-usb
@@ -119,6 +119,31 @@ Description:
                 Write a 1 to force the device to disconnect
                 (equivalent to unplugging a wired USB device).
 
+What:           /sys/bus/usb/drivers/.../new_id
+Date:           October 2011
+Contact:        linux-usb@vger.kernel.org
+Description:
+                Writing a device ID to this file will attempt to
+                dynamically add a new device ID to a USB device driver.
+                This may allow the driver to support more hardware than
+                was included in the driver's static device ID support
+                table at compile time. The format for the device ID is:
+                idVendor idProduct bInterfaceClass.
+                The vendor ID and device ID fields are required, the
+                interface class is optional.
+                Upon successfully adding an ID, the driver will probe
+                for the device and attempt to bind to it.  For example:
+                # echo "8086 10f5" > /sys/bus/usb/drivers/foo/new_id
+
+What:           /sys/bus/usb-serial/drivers/.../new_id
+Date:           October 2011
+Contact:        linux-usb@vger.kernel.org
+Description:
+                For serial USB drivers, this attribute appears under the
+                extra bus folder "usb-serial" in sysfs; apart from that
+                difference, all descriptions from the entry
+                "/sys/bus/usb/drivers/.../new_id" apply.
+
 What:           /sys/bus/usb/drivers/.../remove_id
 Date:           November 2009
 Contact:        CHENG Renquan <rqcheng@smu.edu.sg>
diff --git a/drivers/usb/core/driver.c b/drivers/usb/core/driver.c
index 45887a0ff873..73abd8a0647d 100644
--- a/drivers/usb/core/driver.c
+++ b/drivers/usb/core/driver.c
@@ -45,10 +45,12 @@ ssize_t usb_store_new_id(struct usb_dynids *dynids,
         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;
 
@@ -60,6 +62,10 @@ ssize_t usb_store_new_id(struct usb_dynids *dynids,
         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_INT_CLASS;
+        }
 
         spin_lock(&dynids->lock);
         list_add_tail(&dynid->node, &dynids->list);