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phoenix |
/*****************************************************************************/
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/*
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* auerbuf.h -- Auerswald PBX/System Telephone urb list storage.
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*
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* Copyright (C) 2002 Wolfgang Mües (wolfgang@iksw-muees.de)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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/*****************************************************************************/
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/* This module assembles together an URB, an usb_ctrlrequest struct for sending of
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* control messages, and a data buffer.
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* These items (auerbuf) are collected in a list (auerbufctl) and are used
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* for serialized usb data transfer.
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*/
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#ifndef AUERBUF_H
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#define AUERBUF_H
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#include <linux/usb.h>
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/* buffer element */
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struct auerbufctl; /* forward */
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struct auerbuf {
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unsigned char *bufp; /* reference to allocated data buffer */
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unsigned int len; /* number of characters in data buffer */
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unsigned int retries; /* for urb retries */
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struct usb_ctrlrequest *dr; /* for setup data in control messages */
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struct urb *urbp; /* USB urb */
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struct auerbufctl *list; /* pointer to list */
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struct list_head buff_list; /* reference to next buffer in list */
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};
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/* buffer list control block */
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struct auerbufctl {
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spinlock_t lock; /* protection in interrupt */
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struct list_head free_buff_list;/* free buffers */
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struct list_head rec_buff_list; /* buffers with received data */
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};
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/* Function prototypes */
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void auerbuf_free(struct auerbuf *bp);
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void auerbuf_free_list(struct list_head *q);
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void auerbuf_init(struct auerbufctl *bcp);
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void auerbuf_free_buffers(struct auerbufctl *bcp);
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int auerbuf_setup(struct auerbufctl *bcp, unsigned int numElements,
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unsigned int bufsize);
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struct auerbuf *auerbuf_getbuf(struct auerbufctl *bcp);
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void auerbuf_releasebuf(struct auerbuf *bp);
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#endif /* AUERBUF_H */
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