projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 1efd54ea AP |
1 | /* |
| 2 | * u_f.h | |
| 3 | * | |
| 4 | * Utility definitions for USB functions | |
| 5 | * | |
| 6 | * Copyright (c) 2013 Samsung Electronics Co., Ltd. | |
| 7 | * http://www.samsung.com | |
| 8 | * | |
| 9 | * Author: Andrzej Pietrasiewicz <andrzej.p@samsung.com> | |
| 10 | * | |
| 11 | * This program is free software; you can redistribute it and/or modify | |
| 12 | * it under the terms of the GNU General Public License version 2 as | |
| 13 | * published by the Free Software Foundation. | |
| 14 | */ | |
| 15 | ||
| 16 | #ifndef __U_F_H__ | |
| 17 | #define __U_F_H__ | |
| 18 | ||
| 079fe5a6 FT |
19 | #include <linux/usb/gadget.h> |
| 20 | ||
| 74d48466 AP |
21 | /* Variable Length Array Macros **********************************************/ |
| 22 | #define vla_group(groupname) size_t groupname##__next = 0 | |
| 23 | #define vla_group_size(groupname) groupname##__next | |
| 24 | ||
| 25 | #define vla_item(groupname, type, name, n) \ | |
| 26 | size_t groupname##_##name##__offset = ({ \ | |
| 27 | size_t align_mask = __alignof__(type) - 1; \ | |
| 28 | size_t offset = (groupname##__next + align_mask) & ~align_mask;\ | |
| 29 | size_t size = (n) * sizeof(type); \ | |
| 30 | groupname##__next = offset + size; \ | |
| 31 | offset; \ | |
| 32 | }) | |
| 33 | ||
| 34 | #define vla_item_with_sz(groupname, type, name, n) \ | |
| 35 | size_t groupname##_##name##__sz = (n) * sizeof(type); \ | |
| 36 | size_t groupname##_##name##__offset = ({ \ | |
| 37 | size_t align_mask = __alignof__(type) - 1; \ | |
| 38 | size_t offset = (groupname##__next + align_mask) & ~align_mask;\ | |
| 39 | size_t size = groupname##_##name##__sz; \ | |
| 40 | groupname##__next = offset + size; \ | |
| 41 | offset; \ | |
| 42 | }) | |
| 43 | ||
| 44 | #define vla_ptr(ptr, groupname, name) \ | |
| 45 | ((void *) ((char *)ptr + groupname##_##name##__offset)) | |
| 46 | ||
| 1efd54ea AP |
47 | struct usb_ep; |
| 48 | struct usb_request; | |
| 49 | ||
| e0466156 FT |
50 | /** |
| 51 | * alloc_ep_req - returns a usb_request allocated by the gadget driver and | |
| 52 | * allocates the request's buffer. | |
| 53 | * | |
| 54 | * @ep: the endpoint to allocate a usb_request | |
| 55 | * @len: usb_requests's buffer suggested size | |
| e0466156 FT |
56 | * |
| 57 | * In case @ep direction is OUT, the @len will be aligned to ep's | |
| 58 | * wMaxPacketSize. In order to avoid memory leaks or drops, *always* use | |
| 59 | * usb_requests's length (req->length) to refer to the allocated buffer size. | |
| 60 | * Requests allocated via alloc_ep_req() *must* be freed by free_ep_req(). | |
| 61 | */ | |
| aadbe812 | 62 | struct usb_request *alloc_ep_req(struct usb_ep *ep, size_t len); |
| e0466156 FT |
63 | |
| 64 | /* Frees a usb_request previously allocated by alloc_ep_req() */ | |
| 079fe5a6 FT |
65 | static inline void free_ep_req(struct usb_ep *ep, struct usb_request *req) |
| 66 | { | |
| 67 | kfree(req->buf); | |
| 68 | usb_ep_free_request(ep, req); | |
| 69 | } | |
| 1efd54ea AP |
70 | |
| 71 | #endif /* __U_F_H__ */ |