1 /* $NetBSD: wsemulconf.c,v 1.8 2010/02/02 16:18:29 drochner 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 1.8 2010/02/02 16:18:29 drochner 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
46 struct wsemulentry {
47 const struct wsemul_ops *ops;
48 int usecnt;
49 LIST_ENTRY(wsemulentry) next;
50 };
51 static LIST_HEAD(, wsemulentry) wsemuls = LIST_HEAD_INITIALIZER(&wsemuls);
52
53 static 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
66 const struct wsemul_ops *
wsemul_pick(const char * name)67 wsemul_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
94 void
wsemul_drop(const struct wsemul_ops * ops)95 wsemul_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
106 int
wsemul_add(const struct wsemul_ops * ops)107 wsemul_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
118 int
wsemul_remove(const struct wsemul_ops * ops)119 wsemul_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