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fb.c revision 1.2 
      1 /*	$NetBSD: fb.c,v 1.2 1995/04/07 02:52:28 gwr Exp $ */
      2 
      3 /*
      4  * Copyright (c) 1992, 1993
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * This software was developed by the Computer Systems Engineering group
      8  * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
      9  * contributed to Berkeley.
     10  *
     11  * All advertising materials mentioning features or use of this software
     12  * must display the following acknowledgement:
     13  *	This product includes software developed by the University of
     14  *	California, Lawrence Berkeley Laboratory.
     15  *
     16  * Redistribution and use in source and binary forms, with or without
     17  * modification, are permitted provided that the following conditions
     18  * are met:
     19  * 1. Redistributions of source code must retain the above copyright
     20  *    notice, this list of conditions and the following disclaimer.
     21  * 2. Redistributions in binary form must reproduce the above copyright
     22  *    notice, this list of conditions and the following disclaimer in the
     23  *    documentation and/or other materials provided with the distribution.
     24  * 3. All advertising materials mentioning features or use of this software
     25  *    must display the following acknowledgement:
     26  *	This product includes software developed by the University of
     27  *	California, Berkeley and its contributors.
     28  * 4. Neither the name of the University nor the names of its contributors
     29  *    may be used to endorse or promote products derived from this software
     30  *    without specific prior written permission.
     31  *
     32  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     33  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     34  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     35  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     36  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     37  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     38  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     39  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     40  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     41  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     42  * SUCH DAMAGE.
     43  *
     44  *	@(#)fb.c	8.1 (Berkeley) 6/11/93
     45  */
     46 
     47 /*
     48  * /dev/fb (indirect frame buffer driver).
     49  */
     50 
     51 #include <sys/param.h>
     52 #include <sys/conf.h>
     53 #include <sys/device.h>
     54 #include <sys/ioctl.h>
     55 #include <sys/proc.h>
     56 
     57 #include <machine/fbio.h>
     58 
     59 #include "fbvar.h"
     60 
     61 static struct fbdevice *devfb;
     62 static int fbpriority;
     63 
     64 /*
     65  * This is called by the real driver (i.e. bw2, cg3, ...)
     66  * to declare itself as a potential default frame buffer.
     67  */
     68 void
     69 fb_attach(fb, newpri)
     70 	struct fbdevice *fb;
     71 	int newpri;
     72 {
     73 	if (fbpriority < newpri) {
     74 		fbpriority = newpri;
     75 		devfb = fb;
     76 	}
     77 }
     78 
     79 int
     80 fbopen(dev, flags, mode, p)
     81 	dev_t dev;
     82 	int flags, mode;
     83 	struct proc *p;
     84 {
     85 
     86 	if (devfb == NULL)
     87 		return (ENXIO);
     88 	return ((*devfb->fb_driver->fbd_open)(dev, flags, mode, p));
     89 }
     90 
     91 int
     92 fbclose(dev, flags, mode, p)
     93 	dev_t dev;
     94 	int flags, mode;
     95 	struct proc *p;
     96 {
     97 
     98 	return ((*devfb->fb_driver->fbd_close)(dev, flags, mode, p));
     99 }
    100 
    101 int
    102 fbioctl(dev, cmd, data, flags, p)
    103 	dev_t dev;
    104 	u_long cmd;
    105 	caddr_t data;
    106 	int flags;
    107 	struct proc *p;
    108 {
    109 	return (fbioctlfb(devfb, cmd, data));
    110 }
    111 
    112 int
    113 fbmap(dev, off, prot)
    114 	dev_t dev;
    115 	int off, prot;
    116 {
    117 	return ((*devfb->fb_driver->fbd_mmap)(dev, off, prot));
    118 }
    119 
    120 void
    121 fb_unblank()
    122 {
    123 	int on = 1;
    124 
    125 	if (devfb) {
    126 		(void) fbioctlfb(devfb, FBIOSVIDEO, (caddr_t)&on);
    127 	}
    128 }
    129 
    130 /*
    131  * Common fb ioctl function
    132  */
    133 int
    134 fbioctlfb(fb, cmd, data)
    135 	struct fbdevice *fb;
    136 	u_long cmd;
    137 	caddr_t data;
    138 {
    139 	struct fbdriver *fbd = fb->fb_driver;
    140 	int error;
    141 
    142 	switch (cmd) {
    143 
    144 	case FBIOGTYPE:
    145 		*(struct fbtype *)data = fb->fb_fbtype;
    146 		error = 0;
    147 		break;
    148 
    149 	case FBIOGATTR:
    150 		error = (*fbd->fbd_gattr)(fb, (struct fbgattr *)data);
    151 		break;
    152 
    153 	case FBIOGVIDEO:
    154 		error = (*fbd->fbd_gvideo)(fb, (int *)data);
    155 		break;
    156 
    157 	case FBIOSVIDEO:
    158 		error = (*fbd->fbd_svideo)(fb, (int *)data);
    159 		break;
    160 
    161 	case FBIOGETCMAP:
    162 		error = (*fbd->fbd_getcmap)(fb, (struct fbcmap *)data);
    163 		break;
    164 
    165 	case FBIOPUTCMAP:
    166 		error = (*fbd->fbd_putcmap)(fb, (struct fbcmap *)data);
    167 		break;
    168 
    169 	default:
    170 		error = ENOTTY;
    171 	}
    172 	return (error);
    173 }
    174