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/*****************************************************************************/
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/*
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* auerchar.h -- Auerswald PBX/System Telephone character interface.
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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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#ifndef AUERCHAR_H
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#define AUERCHAR_H
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#include "auerchain.h"
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#include "auerbuf.h"
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#include "auerserv.h"
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/* External data structures / Interface */
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struct audevinfo {
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char *buf; /* return buffer for string contents */
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unsigned int bsize; /* size of return buffer */
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};
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/* IO controls */
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#define IOCTL_AU_SLEN _IOR( 'U', 0xF0, int) /* return the max. string descriptor length */
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#define IOCTL_AU_DEVINFO _IOWR('U', 0xF1, struct audevinfo) /* get name of a specific device */
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#define IOCTL_AU_SERVREQ _IOW( 'U', 0xF2, int) /* request a service channel */
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#define IOCTL_AU_BUFLEN _IOR( 'U', 0xF3, int) /* return the max. buffer length for the device */
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#define IOCTL_AU_RXAVAIL _IOR( 'U', 0xF4, int) /* return != 0 if Receive Data available */
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#define IOCTL_AU_CONNECT _IOR( 'U', 0xF5, int) /* return != 0 if connected to a service channel */
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#define IOCTL_AU_TXREADY _IOR( 'U', 0xF6, int) /* return != 0 if Transmitt channel ready to send */
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/* 'U' 0xF7..0xFF reserved */
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/* character device context */
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struct auerswald;
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struct auerchar {
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struct semaphore mutex; /* protection in user context */
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struct auerswald *auerdev; /* context pointer of assigned device */
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struct auerbufctl bufctl; /* controls the buffer chain */
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struct auerscon scontext; /* service context */
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wait_queue_head_t readwait; /* for synchronous reading */
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struct semaphore readmutex; /* protection against multiple reads */
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struct auerbuf *readbuf; /* buffer held for partial reading */
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unsigned int readoffset; /* current offset in readbuf */
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unsigned int removed; /* is != 0 if device is removed */
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};
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/* Function prototypes */
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void auerchar_delete(struct auerchar *ccp);
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int auerchar_open(struct inode *inode, struct file *file);
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int auerchar_ioctl(struct inode *inode, struct file *file,
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unsigned int cmd, unsigned long arg);
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loff_t auerchar_llseek(struct file *file, loff_t offset, int origin);
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ssize_t auerchar_read(struct file *file, char *buf, size_t count,
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loff_t * ppos);
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ssize_t auerchar_write(struct file *file, const char *buf, size_t len,
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loff_t * ppos);
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int auerchar_release(struct inode *inode, struct file *file);
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#endif /* AUERCHAR_H */
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