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) 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 } 33 EXPORT_SYMBOL_GPL(alloc_ep_req); 34