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      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 *
     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
     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
    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
    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