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/*
* u_f.h
*
* Utility definitions for USB functions
*
* Copyright (c) 2013 Samsung Electronics Co., Ltd.
* http://www.samsung.com
*
* Author: Andrzej Pietrasiewicz <andrzej.p@samsung.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#ifndef __U_F_H__
#define __U_F_H__
#include <linux/usb/gadget.h>
/* Variable Length Array Macros **********************************************/
#define vla_group(groupname) size_t groupname##__next = 0
#define vla_group_size(groupname) groupname##__next
#define vla_item(groupname, type, name, n) \
size_t groupname##_##name##__offset = ({ \
size_t align_mask = __alignof__(type) - 1; \
size_t offset = (groupname##__next + align_mask) & ~align_mask;\
size_t size = (n) * sizeof(type); \
groupname##__next = offset + size; \
offset; \
})
#define vla_item_with_sz(groupname, type, name, n) \
size_t groupname##_##name##__sz = (n) * sizeof(type); \
size_t groupname##_##name##__offset = ({ \
size_t align_mask = __alignof__(type) - 1; \
size_t offset = (groupname##__next + align_mask) & ~align_mask;\
size_t size = groupname##_##name##__sz; \
groupname##__next = offset + size; \
offset; \
})
#define vla_ptr(ptr, groupname, name) \
((void *) ((char *)ptr + groupname##_##name##__offset))
struct usb_ep;
struct usb_request;
/**
* alloc_ep_req - returns a usb_request allocated by the gadget driver and
* allocates the request's buffer.
*
* @ep: the endpoint to allocate a usb_request
* @len: usb_requests's buffer suggested size
*
* In case @ep direction is OUT, the @len will be aligned to ep's
* wMaxPacketSize. In order to avoid memory leaks or drops, *always* use
* usb_requests's length (req->length) to refer to the allocated buffer size.
* Requests allocated via alloc_ep_req() *must* be freed by free_ep_req().
*/
struct usb_request *alloc_ep_req(struct usb_ep *ep, size_t len);
/* Frees a usb_request previously allocated by alloc_ep_req() */
static inline void free_ep_req(struct usb_ep *ep, struct usb_request *req)
{
kfree(req->buf);
usb_ep_free_request(ep, req);
}
#endif /* __U_F_H__ */
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