drivers/usb/gadget/u_f.c

   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
  17 struct usb_request *alloc_ep_req(struct usb_ep *ep, size_t len, int default_len)
  18 {
  19         struct usb_request      *req;
  20
  21         req = usb_ep_alloc_request(ep, GFP_ATOMIC);
  22         if (req) {
  23                 req->length = len ?: default_len;
  24                 if (usb_endpoint_dir_out(ep->desc))
  25                         req->length = usb_ep_align(ep, req->length);
  26                 req->buf = kmalloc(req->length, GFP_ATOMIC);
  27                 if (!req->buf) {
  28                         usb_ep_free_request(ep, req);
  29                         req = NULL;
  30                 }
  31         }
  32         return req;
  33 }
  34 EXPORT_SYMBOL_GPL(alloc_ep_req);