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