+static int usb_endpoint_major_init(void)
+{
+ dev_t dev;
+ int error;
+
+ error = alloc_chrdev_region(&dev, 0, MAX_ENDPOINT_MINORS,
+ "usb_endpoint");
+ if (error) {
+ err("unable to get a dynamic major for usb endpoints");
+ return error;
+ }
+ usb_endpoint_major = MAJOR(dev);
+
+ return error;
+}
+
+static void usb_endpoint_major_cleanup(void)
+{
+ unregister_chrdev_region(MKDEV(usb_endpoint_major, 0),
+ MAX_ENDPOINT_MINORS);
+}
+
+static int endpoint_get_minor(struct ep_device *ep_dev)
+{
+ static DEFINE_MUTEX(minor_lock);
+ int retval = -ENOMEM;
+ int id;
+
+ mutex_lock(&minor_lock);
+ if (idr_pre_get(&endpoint_idr, GFP_KERNEL) == 0)
+ goto exit;
+
+ retval = idr_get_new(&endpoint_idr, ep_dev, &id);
+ if (retval < 0) {
+ if (retval == -EAGAIN)
+ retval = -ENOMEM;
+ goto exit;
+ }
+ ep_dev->minor = id & MAX_ID_MASK;
+exit:
+ mutex_unlock(&minor_lock);
+ return retval;
+}
+
+static void endpoint_free_minor(struct ep_device *ep_dev)
+{
+ idr_remove(&endpoint_idr, ep_dev->minor);
+}
+