+static int proc_disconnect_claim(struct dev_state *ps, void __user *arg)
+{
+ struct usbdevfs_disconnect_claim dc;
+ struct usb_interface *intf;
+
+ if (copy_from_user(&dc, arg, sizeof(dc)))
+ return -EFAULT;
+
+ intf = usb_ifnum_to_if(ps->dev, dc.interface);
+ if (!intf)
+ return -EINVAL;
+
+ if (intf->dev.driver) {
+ struct usb_driver *driver = to_usb_driver(intf->dev.driver);
+
+ if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_IF_DRIVER) &&
+ strncmp(dc.driver, intf->dev.driver->name,
+ sizeof(dc.driver)) != 0)
+ return -EBUSY;
+
+ if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_EXCEPT_DRIVER) &&
+ strncmp(dc.driver, intf->dev.driver->name,
+ sizeof(dc.driver)) == 0)
+ return -EBUSY;
+
+ dev_dbg(&intf->dev, "disconnect by usbfs\n");
+ usb_driver_release_interface(driver, intf);
+ }
+
+ return claimintf(ps, dc.interface);
+}
+