/*-
 * Copyright (c) 1990, 1993
 *	The Regents of the University of California.  All rights reserved.
 * Copyright (c) 2004
 *	Poul-Henning Kamp.  All rights reserved.
 * (c) UNIX System Laboratories, Inc.
 * All or some portions of this file are derived from material licensed
 * to the University of California by American Telephone and Telegraph
 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
 * the permission of UNIX System Laboratories, Inc.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	@(#)conf.h	8.5 (Berkeley) 1/9/95
 * $FreeBSD$
 */

#ifndef _SYS_LINEDISC_H_
#define	_SYS_LINEDISC_H_

#ifdef _KERNEL

struct tty;

typedef int l_open_t(struct cdev *dev, struct tty *tp);
typedef int l_close_t(struct tty *tp, int flag);
typedef int l_read_t(struct tty *tp, struct uio *uio, int flag);
typedef int l_write_t(struct tty *tp, struct uio *uio, int flag);
typedef int l_ioctl_t(struct tty *tp, u_long cmd, caddr_t data,
		      int flag, struct thread *td);
typedef int l_rint_t(int c, struct tty *tp);
typedef int l_start_t(struct tty *tp);
typedef int l_modem_t(struct tty *tp, int flag);

/*
 * Line discipline switch table
 */
struct linesw {
	l_open_t	*l_open;
	l_close_t	*l_close;
	l_read_t	*l_read;
	l_write_t	*l_write;
	l_ioctl_t	*l_ioctl;
	l_rint_t	*l_rint;
	l_start_t	*l_start;
	l_modem_t	*l_modem;
};

extern struct linesw *linesw[];
extern int nlinesw;

int ldisc_register(int , struct linesw *);
void ldisc_deregister(int);
#define LDISC_LOAD 	-1		/* Loadable line discipline */

l_read_t	l_noread;
l_write_t	l_nowrite;
l_ioctl_t	l_nullioctl;

static __inline int
ttyld_open(struct tty *tp, struct cdev *dev)
{

	return ((*linesw[tp->t_line]->l_open)(dev, tp));
}

static __inline int
ttyld_close(struct tty *tp, int flag)
{

	return ((*linesw[tp->t_line]->l_close)(tp, flag));
}

static __inline int
ttyld_read(struct tty *tp, struct uio *uio, int flag)
{

	return ((*linesw[tp->t_line]->l_read)(tp, uio, flag));
}

static __inline int
ttyld_write(struct tty *tp, struct uio *uio, int flag)
{

	return ((*linesw[tp->t_line]->l_write)(tp, uio, flag));
}

static __inline int
ttyld_ioctl(struct tty *tp, u_long cmd, caddr_t data, int flag,
    struct thread *td)
{

	return ((*linesw[tp->t_line]->l_ioctl)(tp, cmd, data, flag, td));
}

static __inline int
ttyld_rint(struct tty *tp, int c)
{

	return ((*linesw[tp->t_line]->l_rint)(c, tp));
}

static __inline int
ttyld_start(struct tty *tp)
{

	return ((*linesw[tp->t_line]->l_start)(tp));
}

static __inline int
ttyld_modem(struct tty *tp, int flag)
{

	return ((*linesw[tp->t_line]->l_modem)(tp, flag));
}

#endif /* _KERNEL */

#endif /* !_SYS_LINEDISC_H_ */