11efd54eaSAndrzej Pietrasiewicz /* 21efd54eaSAndrzej Pietrasiewicz * u_f.h 31efd54eaSAndrzej Pietrasiewicz * 41efd54eaSAndrzej Pietrasiewicz * Utility definitions for USB functions 51efd54eaSAndrzej Pietrasiewicz * 61efd54eaSAndrzej Pietrasiewicz * Copyright (c) 2013 Samsung Electronics Co., Ltd. 71efd54eaSAndrzej Pietrasiewicz * http://www.samsung.com 81efd54eaSAndrzej Pietrasiewicz * 91efd54eaSAndrzej Pietrasiewicz * Author: Andrzej Pietrasiewicz <andrzej.p@samsung.com> 101efd54eaSAndrzej Pietrasiewicz * 111efd54eaSAndrzej Pietrasiewicz * This program is free software; you can redistribute it and/or modify 121efd54eaSAndrzej Pietrasiewicz * it under the terms of the GNU General Public License version 2 as 131efd54eaSAndrzej Pietrasiewicz * published by the Free Software Foundation. 141efd54eaSAndrzej Pietrasiewicz */ 151efd54eaSAndrzej Pietrasiewicz 161efd54eaSAndrzej Pietrasiewicz #ifndef __U_F_H__ 171efd54eaSAndrzej Pietrasiewicz #define __U_F_H__ 181efd54eaSAndrzej Pietrasiewicz 19079fe5a6SFelipe F. Tonello #include <linux/usb/gadget.h> 20079fe5a6SFelipe F. Tonello 2174d48466SAndrzej Pietrasiewicz /* Variable Length Array Macros **********************************************/ 2274d48466SAndrzej Pietrasiewicz #define vla_group(groupname) size_t groupname##__next = 0 2374d48466SAndrzej Pietrasiewicz #define vla_group_size(groupname) groupname##__next 2474d48466SAndrzej Pietrasiewicz 2574d48466SAndrzej Pietrasiewicz #define vla_item(groupname, type, name, n) \ 2674d48466SAndrzej Pietrasiewicz size_t groupname##_##name##__offset = ({ \ 2774d48466SAndrzej Pietrasiewicz size_t align_mask = __alignof__(type) - 1; \ 2874d48466SAndrzej Pietrasiewicz size_t offset = (groupname##__next + align_mask) & ~align_mask;\ 2974d48466SAndrzej Pietrasiewicz size_t size = (n) * sizeof(type); \ 3074d48466SAndrzej Pietrasiewicz groupname##__next = offset + size; \ 3174d48466SAndrzej Pietrasiewicz offset; \ 3274d48466SAndrzej Pietrasiewicz }) 3374d48466SAndrzej Pietrasiewicz 3474d48466SAndrzej Pietrasiewicz #define vla_item_with_sz(groupname, type, name, n) \ 3574d48466SAndrzej Pietrasiewicz size_t groupname##_##name##__sz = (n) * sizeof(type); \ 3674d48466SAndrzej Pietrasiewicz size_t groupname##_##name##__offset = ({ \ 3774d48466SAndrzej Pietrasiewicz size_t align_mask = __alignof__(type) - 1; \ 3874d48466SAndrzej Pietrasiewicz size_t offset = (groupname##__next + align_mask) & ~align_mask;\ 3974d48466SAndrzej Pietrasiewicz size_t size = groupname##_##name##__sz; \ 4074d48466SAndrzej Pietrasiewicz groupname##__next = offset + size; \ 4174d48466SAndrzej Pietrasiewicz offset; \ 4274d48466SAndrzej Pietrasiewicz }) 4374d48466SAndrzej Pietrasiewicz 4474d48466SAndrzej Pietrasiewicz #define vla_ptr(ptr, groupname, name) \ 4574d48466SAndrzej Pietrasiewicz ((void *) ((char *)ptr + groupname##_##name##__offset)) 4674d48466SAndrzej Pietrasiewicz 471efd54eaSAndrzej Pietrasiewicz struct usb_ep; 481efd54eaSAndrzej Pietrasiewicz struct usb_request; 491efd54eaSAndrzej Pietrasiewicz 50e0466156SFelipe F. Tonello /** 51e0466156SFelipe F. Tonello * alloc_ep_req - returns a usb_request allocated by the gadget driver and 52e0466156SFelipe F. Tonello * allocates the request's buffer. 53e0466156SFelipe F. Tonello * 54e0466156SFelipe F. Tonello * @ep: the endpoint to allocate a usb_request 55e0466156SFelipe F. Tonello * @len: usb_requests's buffer suggested size 56e0466156SFelipe F. Tonello * 57e0466156SFelipe F. Tonello * In case @ep direction is OUT, the @len will be aligned to ep's 58e0466156SFelipe F. Tonello * wMaxPacketSize. In order to avoid memory leaks or drops, *always* use 59e0466156SFelipe F. Tonello * usb_requests's length (req->length) to refer to the allocated buffer size. 60e0466156SFelipe F. Tonello * Requests allocated via alloc_ep_req() *must* be freed by free_ep_req(). 61e0466156SFelipe F. Tonello */ 62aadbe812SFelipe F. Tonello struct usb_request *alloc_ep_req(struct usb_ep *ep, size_t len); 63e0466156SFelipe F. Tonello 64e0466156SFelipe F. Tonello /* Frees a usb_request previously allocated by alloc_ep_req() */ 65079fe5a6SFelipe F. Tonello static inline void free_ep_req(struct usb_ep *ep, struct usb_request *req) 66079fe5a6SFelipe F. Tonello { 67079fe5a6SFelipe F. Tonello kfree(req->buf); 68079fe5a6SFelipe F. Tonello usb_ep_free_request(ep, req); 69079fe5a6SFelipe F. Tonello } 701efd54eaSAndrzej Pietrasiewicz 711efd54eaSAndrzej Pietrasiewicz #endif /* __U_F_H__ */ 72