1/*
 2 * u_f.h
 3 *
 4 * Utility definitions for USB functions
 5 *
 6 * Copyright (c) 2013 Samsung Electronics Co., Ltd.
 7 *		http://www.samsung.com
 8 *
 9 * Author: Andrzej Pietrasiewicz <andrzej.p@samsung.com>
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License version 2 as
13 * published by the Free Software Foundation.
14 */
15
16#ifndef __U_F_H__
17#define __U_F_H__
18
19#include <linux/usb/gadget.h>
20
21/* Variable Length Array Macros **********************************************/
22#define vla_group(groupname) size_t groupname##__next = 0
23#define vla_group_size(groupname) groupname##__next
24
25#define vla_item(groupname, type, name, n) \
26	size_t groupname##_##name##__offset = ({			       \
27		size_t align_mask = __alignof__(type) - 1;		       \
28		size_t offset = (groupname##__next + align_mask) & ~align_mask;\
29		size_t size = (n) * sizeof(type);			       \
30		groupname##__next = offset + size;			       \
31		offset;							       \
32	})
33
34#define vla_item_with_sz(groupname, type, name, n) \
35	size_t groupname##_##name##__sz = (n) * sizeof(type);		       \
36	size_t groupname##_##name##__offset = ({			       \
37		size_t align_mask = __alignof__(type) - 1;		       \
38		size_t offset = (groupname##__next + align_mask) & ~align_mask;\
39		size_t size = groupname##_##name##__sz;			       \
40		groupname##__next = offset + size;			       \
41		offset;							       \
42	})
43
44#define vla_ptr(ptr, groupname, name) \
45	((void *) ((char *)ptr + groupname##_##name##__offset))
46
47struct usb_ep;
48struct usb_request;
49
50/* Requests allocated via alloc_ep_req() must be freed by free_ep_req(). */
51struct usb_request *alloc_ep_req(struct usb_ep *ep, int len, int default_len);
52static inline void free_ep_req(struct usb_ep *ep, struct usb_request *req)
53{
54	kfree(req->buf);
55	usb_ep_free_request(ep, req);
56}
57
58#endif /* __U_F_H__ */