Change the kernel dev_t, representing a pointer to a specinfo structure,
[dragonfly.git] / sys / kern / tty_conf.c
CommitLineData
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1/*-
2 * Copyright (c) 1982, 1986, 1991, 1993
3 * The Regents of the University of California. All rights reserved.
4 * (c) UNIX System Laboratories, Inc.
5 * All or some portions of this file are derived from material licensed
6 * to the University of California by American Telephone and Telegraph
7 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
8 * the permission of UNIX System Laboratories, Inc.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. All advertising materials mentioning features or use of this software
19 * must display the following acknowledgement:
20 * This product includes software developed by the University of
21 * California, Berkeley and its contributors.
22 * 4. Neither the name of the University nor the names of its contributors
23 * may be used to endorse or promote products derived from this software
24 * without specific prior written permission.
25 *
26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 * SUCH DAMAGE.
37 *
38 * @(#)tty_conf.c 8.4 (Berkeley) 1/21/94
39 * $FreeBSD: src/sys/kern/tty_conf.c,v 1.16.2.1 2002/03/11 01:14:55 dd Exp $
b13267a5 40 * $DragonFly: src/sys/kern/tty_conf.c,v 1.5 2006/09/10 01:26:39 dillon Exp $
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41 */
42
43#include "opt_compat.h"
44
45#include <sys/param.h>
46#include <sys/systm.h>
47#include <sys/tty.h>
48#include <sys/conf.h>
49
50#ifndef MAXLDISC
51#define MAXLDISC 9
52#endif
53
54static l_open_t l_noopen;
55static l_close_t l_noclose;
56static l_rint_t l_norint;
57static l_start_t l_nostart;
58
59/*
60 * XXX it probably doesn't matter what the entries other than the l_open
61 * entry are here. The l_nullioctl and ttymodem entries still look fishy.
62 * Reconsider the removal of nullmodem anyway. It was too much like
63 * ttymodem, but a completely null version might be useful.
64 */
65#define NODISC(n) \
66 { l_noopen, l_noclose, l_noread, l_nowrite, \
67 l_nullioctl, l_norint, l_nostart, ttymodem }
68
69struct linesw linesw[MAXLDISC] =
70{
71 /* 0- termios */
72 { ttyopen, ttylclose, ttread, ttwrite,
73 l_nullioctl, ttyinput, ttstart, ttymodem },
74 NODISC(1), /* 1- defunct */
75 /* 2- NTTYDISC */
76#ifdef COMPAT_43
77 { ttyopen, ttylclose, ttread, ttwrite,
78 l_nullioctl, ttyinput, ttstart, ttymodem },
79#else
80 NODISC(2),
81#endif
82 NODISC(3), /* loadable */
83 NODISC(4), /* SLIPDISC */
84 NODISC(5), /* PPPDISC */
85 NODISC(6), /* NETGRAPHDISC */
86 NODISC(7), /* loadable */
87 NODISC(8), /* loadable */
88};
89
90int nlinesw = sizeof (linesw) / sizeof (linesw[0]);
91
92static struct linesw nodisc = NODISC(0);
93
94#define LOADABLE_LDISC 7
95/*
96 * ldisc_register: Register a line discipline.
97 *
98 * discipline: Index for discipline to load, or LDISC_LOAD for us to choose.
99 * linesw_p: Pointer to linesw_p.
100 *
101 * Returns: Index used or -1 on failure.
102 */
103int
104ldisc_register(discipline, linesw_p)
105 int discipline;
106 struct linesw *linesw_p;
107{
108 int slot = -1;
109
110 if (discipline == LDISC_LOAD) {
111 int i;
112 for (i = LOADABLE_LDISC; i < MAXLDISC; i++)
113 if (bcmp(linesw + i, &nodisc, sizeof(nodisc)) == 0) {
114 slot = i;
115 }
116 }
117 else if (discipline >= 0 && discipline < MAXLDISC) {
118 slot = discipline;
119 }
120
121 if (slot != -1 && linesw_p)
122 linesw[slot] = *linesw_p;
123
124 return slot;
125}
126
127/*
128 * ldisc_deregister: Deregister a line discipline obtained with
129 * ldisc_register.
130 *
131 * discipline: Index for discipline to unload.
132 */
133void
134ldisc_deregister(discipline)
135 int discipline;
136{
137 if (discipline < MAXLDISC) {
138 linesw[discipline] = nodisc;
139 }
140}
141
142static int
143l_noopen(dev, tp)
b13267a5 144 cdev_t dev;
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145 struct tty *tp;
146{
147
148 return (ENODEV);
149}
150
151static int
152l_noclose(tp, flag)
153 struct tty *tp;
154 int flag;
155{
156
157 return (ENODEV);
158}
159
160int
161l_noread(tp, uio, flag)
162 struct tty *tp;
163 struct uio *uio;
164 int flag;
165{
166
167 return (ENODEV);
168}
169
170int
171l_nowrite(tp, uio, flag)
172 struct tty *tp;
173 struct uio *uio;
174 int flag;
175{
176
177 return (ENODEV);
178}
179
180static int
181l_norint(c, tp)
182 int c;
183 struct tty *tp;
184{
185
186 return (ENODEV);
187}
188
189static int
190l_nostart(tp)
191 struct tty *tp;
192{
193
194 return (ENODEV);
195}
196
197/*
198 * Do nothing specific version of line
199 * discipline specific ioctl command.
200 */
201int
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202l_nullioctl(struct tty *tp, u_long cmd, char *data, int flags,
203 struct ucred *cred)
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204{
205
206 return (ENOIOCTL);
207}