kernel/drivers/usb/gadget/u_f.h

   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 /* Variable Length Array Macros **********************************************/
  20 #define vla_group(groupname) size_t groupname##__next = 0
  21 #define vla_group_size(groupname) groupname##__next
  22
  23 #define vla_item(groupname, type, name, n) \
  24         size_t groupname##_##name##__offset = ({                               \
  25                 size_t align_mask = __alignof__(type) - 1;                     \
  26                 size_t offset = (groupname##__next + align_mask) & ~align_mask;\
  27                 size_t size = (n) * sizeof(type);                              \
  28                 groupname##__next = offset + size;                             \
  29                 offset;                                                        \
  30         })
  31
  32 #define vla_item_with_sz(groupname, type, name, n) \
  33         size_t groupname##_##name##__sz = (n) * sizeof(type);                  \
  34         size_t groupname##_##name##__offset = ({                               \
  35                 size_t align_mask = __alignof__(type) - 1;                     \
  36                 size_t offset = (groupname##__next + align_mask) & ~align_mask;\
  37                 size_t size = groupname##_##name##__sz;                        \
  38                 groupname##__next = offset + size;                             \
  39                 offset;                                                        \
  40         })
  41
  42 #define vla_ptr(ptr, groupname, name) \
  43         ((void *) ((char *)ptr + groupname##_##name##__offset))
  44
  45 struct usb_ep;
  46 struct usb_request;
  47
  48 struct usb_request *alloc_ep_req(struct usb_ep *ep, int len, int default_len);
  49
  50 #endif /* __U_F_H__ */
  51
  52