87 lines
2.6 KiB
C
87 lines
2.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* u_f.h
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*
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* Utility definitions for USB functions
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*
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* Copyright (c) 2013 Samsung Electronics Co., Ltd.
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* http://www.samsung.com
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*
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* Author: Andrzej Pietrasiewicz <andrzej.p@samsung.com>
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*/
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#ifndef __U_F_H__
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#define __U_F_H__
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#include <linux/usb/gadget.h>
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#include <linux/overflow.h>
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/* Variable Length Array Macros **********************************************/
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#define vla_group(groupname) size_t groupname##__next = 0
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#define vla_group_size(groupname) groupname##__next
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#define vla_item(groupname, type, name, n) \
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size_t groupname##_##name##__offset = ({ \
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size_t offset = 0; \
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if (groupname##__next != SIZE_MAX) { \
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size_t align_mask = __alignof__(type) - 1; \
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size_t size = array_size(n, sizeof(type)); \
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offset = (groupname##__next + align_mask) & \
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~align_mask; \
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if (check_add_overflow(offset, size, \
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&groupname##__next)) { \
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groupname##__next = SIZE_MAX; \
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offset = 0; \
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} \
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} \
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offset; \
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})
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#define vla_item_with_sz(groupname, type, name, n) \
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size_t groupname##_##name##__sz = array_size(n, sizeof(type)); \
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size_t groupname##_##name##__offset = ({ \
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size_t offset = 0; \
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if (groupname##__next != SIZE_MAX) { \
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size_t align_mask = __alignof__(type) - 1; \
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offset = (groupname##__next + align_mask) & \
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~align_mask; \
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if (check_add_overflow(offset, groupname##_##name##__sz,\
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&groupname##__next)) { \
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groupname##__next = SIZE_MAX; \
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offset = 0; \
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} \
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} \
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offset; \
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})
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#define vla_ptr(ptr, groupname, name) \
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((void *) ((char *)ptr + groupname##_##name##__offset))
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struct usb_ep;
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struct usb_request;
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/**
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* alloc_ep_req - returns a usb_request allocated by the gadget driver and
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* allocates the request's buffer.
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*
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* @ep: the endpoint to allocate a usb_request
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* @len: usb_requests's buffer suggested size
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*
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* In case @ep direction is OUT, the @len will be aligned to ep's
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* wMaxPacketSize. In order to avoid memory leaks or drops, *always* use
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* usb_requests's length (req->length) to refer to the allocated buffer size.
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* Requests allocated via alloc_ep_req() *must* be freed by free_ep_req().
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*/
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struct usb_request *alloc_ep_req(struct usb_ep *ep, size_t len);
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/* Frees a usb_request previously allocated by alloc_ep_req() */
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static inline void free_ep_req(struct usb_ep *ep, struct usb_request *req)
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{
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WARN_ON(req->buf == NULL);
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kfree(req->buf);
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req->buf = NULL;
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usb_ep_free_request(ep, req);
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}
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#endif /* __U_F_H__ */
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