LXR linux/drivers/usb/gadget/u

   1/*
   2 * u_f.c -- USB function utilities for Gadget stack
   3 *
   4 * Copyright (c) 2013 Samsung Electronics Co., Ltd.
   5 *              http://www.samsung.com
   6 *
   7 * Author: Andrzej Pietrasiewicz <andrzej.p@samsung.com>
   8 *
   9 * This program is free software; you can redistribute it and/or modify
  10 * it under the terms of the GNU General Public License version 2 as
  11 * published by the Free Software Foundation.
  12 */
  13
  14#include "u_f.h"
  15#include <linux/usb/ch9.h>
  16
  17struct usb_request *alloc_ep_req(struct usb_ep *ep, size_t len)
  18{
  19        struct usb_request      *req;
  20
  21        req = usb_ep_alloc_request(ep, GFP_ATOMIC);
  22        if (req) {
  23                req->length = usb_endpoint_dir_out(ep->desc) ?
  24                        usb_ep_align(ep, len) : len;
  25                req->buf = kmalloc(req->length, GFP_ATOMIC);
  26                if (!req->buf) {
  27                        usb_ep_free_request(ep, req);
  28                        req = NULL;
  29                }
  30        }
  31        return req;
  32}
  33EXPORT_SYMBOL_GPL(alloc_ep_req);
  34