1 /*****************************************************************************/ 2 /* 3 * auerbuf.h -- Auerswald PBX/System Telephone urb list storage. 4 * 5 * Copyright (C) 2002 Wolfgang M�es (wolfgang@iksw-muees.de) 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License as published by 9 * the Free Software Foundation; either version 2 of the License, or 10 * (at your option) any later version. 11 * 12 * This program is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 * GNU General Public License for more details. 16 * 17 * You should have received a copy of the GNU General Public License 18 * along with this program; if not, write to the Free Software 19 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 20 */ 21 /*****************************************************************************/ 22 23 /* This module assembles together an URB, an usb_ctrlrequest struct for sending of 24 * control messages, and a data buffer. 25 * These items (auerbuf) are collected in a list (auerbufctl) and are used 26 * for serialized usb data transfer. 27 */ 28 29 #ifndef AUERBUF_H 30 #define AUERBUF_H 31 32 #include <linux/usb.h> 33 34 /* buffer element */ 35 struct auerbufctl; /* forward */ 36 struct auerbuf { 37 unsigned char *bufp; /* reference to allocated data buffer */ 38 unsigned int len; /* number of characters in data buffer */ 39 unsigned int retries; /* for urb retries */ 40 struct usb_ctrlrequest *dr; /* for setup data in control messages */ 41 struct urb *urbp; /* USB urb */ 42 struct auerbufctl *list; /* pointer to list */ 43 struct list_head buff_list; /* reference to next buffer in list */ 44 }; 45 46 /* buffer list control block */ 47 struct auerbufctl { 48 spinlock_t lock; /* protection in interrupt */ 49 struct list_head free_buff_list;/* free buffers */ 50 struct list_head rec_buff_list; /* buffers with received data */ 51 }; 52 53 /* Function prototypes */ 54 void auerbuf_free(struct auerbuf *bp); 55 56 void auerbuf_free_list(struct list_head *q); 57 58 void auerbuf_init(struct auerbufctl *bcp); 59 60 void auerbuf_free_buffers(struct auerbufctl *bcp); 61 62 int auerbuf_setup(struct auerbufctl *bcp, unsigned int numElements, 63 unsigned int bufsize); 64 65 struct auerbuf *auerbuf_getbuf(struct auerbufctl *bcp); 66 67 void auerbuf_releasebuf(struct auerbuf *bp); 68 69 #endif /* AUERBUF_H */ 70