// SPDX-License-Identifier: GPL-2.0
/*
* func_utils.h
*
* Utility definitions for USB functions
*
* Copyright (c) 2013 Samsung Electronics Co., Ltd.
* http://www.samsung.com
*
* Author: Andrzej Pietrasiewicz <andrzejtp2010@gmail.com>
*/
#ifndef _FUNC_UTILS_H_
#define _FUNC_UTILS_H_
#include <linux/usb/gadget.h>
#include <linux/overflow.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 offset = 0; \
if (groupname
##__next != SIZE_MAX) { \
size_t align_mask = __alignof__(type) - 1; \
size_t size = array_size(n,
sizeof(type)); \
offset = (groupname
##__next + align_mask) & \
~align_mask; \
if (check_add_overflow(offset, size, \
&groupname
##__next)) { \
groupname
##__next = SIZE_MAX; \
offset = 0; \
} \
} \
offset; \
})
#define vla_item_with_sz(groupname, type, name, n) \
size_t groupname
##_
##name
##__sz = array_size(n,
sizeof(type)); \
size_t groupname
##_
##name
##__offset = ({ \
size_t offset = 0; \
if (groupname
##__next != SIZE_MAX) { \
size_t align_mask = __alignof__(type) - 1; \
offset = (groupname
##__next + align_mask) & \
~align_mask; \
if (check_add_overflow(offset, groupname
##_
##name
##__sz,\
&groupname
##__next)) { \
groupname
##__next = SIZE_MAX; \
offset = 0; \
} \
} \
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)
{
WARN_ON(req->buf == NULL);
kfree(req->buf);
req->buf = NULL;
usb_ep_free_request(ep, req);
}
#endif /* _FUNC_UTILS_H_ */
