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5fd54ace | 1 | // SPDX-License-Identifier: GPL-2.0 |
1efd54ea AP |
2 | /* |
3 | * u_f.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 <andrzej.p@samsung.com> | |
1efd54ea AP |
11 | */ |
12 | ||
13 | #ifndef __U_F_H__ | |
14 | #define __U_F_H__ | |
15 | ||
079fe5a6 FT |
16 | #include <linux/usb/gadget.h> |
17 | ||
74d48466 AP |
18 | /* Variable Length Array Macros **********************************************/ |
19 | #define vla_group(groupname) size_t groupname##__next = 0 | |
20 | #define vla_group_size(groupname) groupname##__next | |
21 | ||
22 | #define vla_item(groupname, type, name, n) \ | |
23 | size_t groupname##_##name##__offset = ({ \ | |
24 | size_t align_mask = __alignof__(type) - 1; \ | |
25 | size_t offset = (groupname##__next + align_mask) & ~align_mask;\ | |
26 | size_t size = (n) * sizeof(type); \ | |
27 | groupname##__next = offset + size; \ | |
28 | offset; \ | |
29 | }) | |
30 | ||
31 | #define vla_item_with_sz(groupname, type, name, n) \ | |
32 | size_t groupname##_##name##__sz = (n) * sizeof(type); \ | |
33 | size_t groupname##_##name##__offset = ({ \ | |
34 | size_t align_mask = __alignof__(type) - 1; \ | |
35 | size_t offset = (groupname##__next + align_mask) & ~align_mask;\ | |
36 | size_t size = groupname##_##name##__sz; \ | |
37 | groupname##__next = offset + size; \ | |
38 | offset; \ | |
39 | }) | |
40 | ||
41 | #define vla_ptr(ptr, groupname, name) \ | |
42 | ((void *) ((char *)ptr + groupname##_##name##__offset)) | |
43 | ||
1efd54ea AP |
44 | struct usb_ep; |
45 | struct usb_request; | |
46 | ||
e0466156 FT |
47 | /** |
48 | * alloc_ep_req - returns a usb_request allocated by the gadget driver and | |
49 | * allocates the request's buffer. | |
50 | * | |
51 | * @ep: the endpoint to allocate a usb_request | |
52 | * @len: usb_requests's buffer suggested size | |
e0466156 FT |
53 | * |
54 | * In case @ep direction is OUT, the @len will be aligned to ep's | |
55 | * wMaxPacketSize. In order to avoid memory leaks or drops, *always* use | |
56 | * usb_requests's length (req->length) to refer to the allocated buffer size. | |
57 | * Requests allocated via alloc_ep_req() *must* be freed by free_ep_req(). | |
58 | */ | |
aadbe812 | 59 | struct usb_request *alloc_ep_req(struct usb_ep *ep, size_t len); |
e0466156 FT |
60 | |
61 | /* Frees a usb_request previously allocated by alloc_ep_req() */ | |
079fe5a6 FT |
62 | static inline void free_ep_req(struct usb_ep *ep, struct usb_request *req) |
63 | { | |
7fafcfdf | 64 | WARN_ON(req->buf == NULL); |
079fe5a6 | 65 | kfree(req->buf); |
7fafcfdf | 66 | req->buf = NULL; |
079fe5a6 FT |
67 | usb_ep_free_request(ep, req); |
68 | } | |
1efd54ea AP |
69 | |
70 | #endif /* __U_F_H__ */ |