1/* $NetBSD: wsemulconf.c,v 1.7 2005/12/11 12:24:12 christos Exp $ */
2
3/*
4 * Copyright (c) 1996, 1997 Christopher G. Demetriou.  All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 * 3. All advertising materials mentioning features or use of this software
15 *    must display the following acknowledgement:
16 *      This product includes software developed by Christopher G. Demetriou
17 *	for the NetBSD Project.
18 * 4. The name of the author may not be used to endorse or promote products
19 *    derived from this software without specific prior written permission
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
22 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
23 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
24 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
26 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
30 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31 */
32
33#include <sys/cdefs.h>
34__KERNEL_RCSID(0, "$NetBSD: wsemulconf.c,v 1.7 2005/12/11 12:24:12 christos Exp $");
35
36#include <sys/param.h>
37#include <sys/systm.h>
38#include <sys/malloc.h>
39
40#include <dev/wscons/wsconsio.h>
41#include <dev/wscons/wsdisplayvar.h>
42#include <dev/wscons/wsksymvar.h>
43#include <dev/wscons/wsemulvar.h>		/* pulls in opt_wsemul.h */
44#include <dev/wscons/wscons_callbacks.h>
45
46struct wsemulentry {
47	const struct wsemul_ops *ops;
48	int usecnt;
49	LIST_ENTRY(wsemulentry) next;
50};
51static LIST_HEAD(, wsemulentry) wsemuls = LIST_HEAD_INITIALIZER(&wsemuls);
52
53static const struct wsemul_ops *wsemul_conf[] = {
54#ifdef WSEMUL_SUN
55	&wsemul_sun_ops,
56#endif
57#ifdef WSEMUL_VT100
58	&wsemul_vt100_ops,
59#endif
60#ifndef WSEMUL_NO_DUMB
61	&wsemul_dumb_ops,
62#endif
63	NULL
64};
65
66const struct wsemul_ops *
67wsemul_pick(const char *name)
68{
69	const struct wsemul_ops **ops;
70	struct wsemulentry *wep;
71
72	if (name == NULL) {
73		/* default */
74#ifdef WSEMUL_DEFAULT
75		name = WSEMUL_DEFAULT;
76#else
77		return (wsemul_conf[0]);
78#endif
79	}
80
81	LIST_FOREACH(wep, &wsemuls, next)
82		if (!strcmp(name, wep->ops->name)) {
83			wep->usecnt++;
84			return wep->ops;
85		}
86
87	for (ops = &wsemul_conf[0]; *ops != NULL; ops++)
88		if (strcmp(name, (*ops)->name) == 0)
89			break;
90
91	return (*ops);
92}
93
94void
95wsemul_drop(const struct wsemul_ops *ops)
96{
97	struct wsemulentry *wep;
98
99	LIST_FOREACH(wep, &wsemuls, next)
100		if (ops == wep->ops) {
101			wep->usecnt--;
102			return;
103		}
104}
105
106int
107wsemul_add(const struct wsemul_ops *ops)
108{
109	struct wsemulentry *wep;
110
111	wep = malloc(sizeof (struct wsemulentry), M_DEVBUF, M_WAITOK);
112	wep->ops = ops;
113	wep->usecnt = 0;
114	LIST_INSERT_HEAD(&wsemuls, wep, next);
115	return 0;
116}
117
118int
119wsemul_remove(const struct wsemul_ops *ops)
120{
121	struct wsemulentry *wep;
122
123	LIST_FOREACH(wep, &wsemuls, next) {
124		if (ops == wep->ops) {
125			if (wep->usecnt)
126				return EBUSY;
127			LIST_REMOVE(wep, next);
128			return 0;
129		}
130	}
131	return ENOENT;
132}
133