We move the func_utils.h header to include/linux/usb to be able to compile function drivers outside of the drivers/usb/gadget/function directory.
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| 1 | +// SPDX-License-Identifier: GPL-2.0 | |
| 2 | +/* | |
| 3 | + * func_utils.h | |
| 4 | + * | |
| 5 | + * Utility definitions for USB functions | |
| 6 | + * | |
| 7 | + * Copyright (c) 2013 Samsung Electronics Co., Ltd. | |
| 8 | + * http://www.samsung.com | |
| 9 | + * | |
| 10 | + * Author: Andrzej Pietrasiewicz <andrzejtp2010@gmail.com> | |
| 11 | + */ | |
| 12 | + | |
| 13 | +#ifndef _FUNC_UTILS_H_ | |
| 14 | +#define _FUNC_UTILS_H_ | |
| 15 | + | |
| 16 | +#include <linux/usb/gadget.h> | |
| 17 | +#include <linux/overflow.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 offset = 0; \ | |
| 26 | + if (groupname##__next != SIZE_MAX) { \ | |
| 27 | + size_t align_mask = __alignof__(type) - 1; \ | |
| 28 | + size_t size = array_size(n, sizeof(type)); \ | |
| 29 | + offset = (groupname##__next + align_mask) & \ | |
| 30 | + ~align_mask; \ | |
| 31 | + if (check_add_overflow(offset, size, \ | |
| 32 | + &groupname##__next)) { \ | |
| 33 | + groupname##__next = SIZE_MAX; \ | |
| 34 | + offset = 0; \ | |
| 35 | + } \ | |
| 36 | + } \ | |
| 37 | + offset; \ | |
| 38 | + }) | |
| 39 | + | |
| 40 | +#define vla_item_with_sz(groupname, type, name, n) \ | |
| 41 | + size_t groupname##_##name##__sz = array_size(n, sizeof(type)); \ | |
| 42 | + size_t groupname##_##name##__offset = ({ \ | |
| 43 | + size_t offset = 0; \ | |
| 44 | + if (groupname##__next != SIZE_MAX) { \ | |
| 45 | + size_t align_mask = __alignof__(type) - 1; \ | |
| 46 | + offset = (groupname##__next + align_mask) & \ | |
| 47 | + ~align_mask; \ | |
| 48 | + if (check_add_overflow(offset, groupname##_##name##__sz,\ | |
| 49 | + &groupname##__next)) { \ | |
| 50 | + groupname##__next = SIZE_MAX; \ | |
| 51 | + offset = 0; \ | |
| 52 | + } \ | |
| 53 | + } \ | |
| 54 | + offset; \ | |
| 55 | + }) | |
| 56 | + | |
| 57 | +#define vla_ptr(ptr, groupname, name) \ | |
| 58 | + ((void *) ((char *)ptr + groupname##_##name##__offset)) | |
| 59 | + | |
| 60 | +struct usb_ep; | |
| 61 | +struct usb_request; | |
| 62 | + | |
| 63 | +/** | |
| 64 | + * alloc_ep_req - returns a usb_request allocated by the gadget driver and | |
| 65 | + * allocates the request's buffer. | |
| 66 | + * | |
| 67 | + * @ep: the endpoint to allocate a usb_request | |
| 68 | + * @len: usb_requests's buffer suggested size | |
| 69 | + * | |
| 70 | + * In case @ep direction is OUT, the @len will be aligned to ep's | |
| 71 | + * wMaxPacketSize. In order to avoid memory leaks or drops, *always* use | |
| 72 | + * usb_requests's length (req->length) to refer to the allocated buffer size. | |
| 73 | + * Requests allocated via alloc_ep_req() *must* be freed by free_ep_req(). | |
| 74 | + */ | |
| 75 | +struct usb_request *alloc_ep_req(struct usb_ep *ep, size_t len); | |
| 76 | + | |
| 77 | +/* Frees a usb_request previously allocated by alloc_ep_req() */ | |
| 78 | +static inline void free_ep_req(struct usb_ep *ep, struct usb_request *req) | |
| 79 | +{ | |
| 80 | + WARN_ON(req->buf == NULL); | |
| 81 | + kfree(req->buf); | |
| 82 | + req->buf = NULL; | |
| 83 | + usb_ep_free_request(ep, req); | |
| 84 | +} | |
| 85 | + | |
| 86 | +#endif /* _FUNC_UTILS_H_ */ | |