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videomode.c revision 1.3 
      1 /*	$NetBSD: videomode.c,v 1.3 1997/10/17 14:01:55 lukem Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1995 Christian E. Hopps
      5  * Copyright (c) 1994 Markus Wild
      6  * All rights reserved.
      7  *
      8  * Redistribution and use in source and binary forms, with or without
      9  * modification, are permitted provided that the following conditions
     10  * are met:
     11  * 1. Redistributions of source code must retain the above copyright
     12  *    notice, this list of conditions and the following disclaimer.
     13  * 2. Redistributions in binary form must reproduce the above copyright
     14  *    notice, this list of conditions and the following disclaimer in the
     15  *    documentation and/or other materials provided with the distribution.
     16  * 3. All advertising materials mentioning features or use of this software
     17  *    must display the following acknowledgement:
     18  *      This product includes software developed by Markus Wild
     19  * 4. The name of the author may not be used to endorse or promote products
     20  *    derived from this software without specific prior written permission
     21  *
     22  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     23  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     24  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     25  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     26  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     27  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     28  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     29  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     30  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     31  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     32  */
     33 
     34 #include <sys/types.h>
     35 #include <sys/stat.h>
     36 #include <sys/ioctl.h>
     37 #include <sys/device.h>
     38 #include <amiga/dev/grfioctl.h>
     39 #include <amiga/dev/grfvar.h>
     40 
     41 #include <err.h>
     42 #include <errno.h>
     43 #include <fcntl.h>
     44 #include <stdio.h>
     45 #include <stdlib.h>
     46 #include <unistd.h>
     47 
     48 void	dump_mode __P((int));
     49 void	dump_vm   __P((struct grfvideo_mode *));
     50 int	get_grf __P((void));
     51 int	main __P((int, char **));
     52 void	set_mode __P((int));
     53 void	usage __P((void));
     54 
     55 int
     56 main(argc, argv)
     57 	int argc;
     58 	char *argv[];
     59 {
     60 	int m;
     61 	int c;
     62 
     63 	if (argc == 1) {
     64 		dump_mode(0);
     65 		return (0);
     66 	}
     67 	while ((c = getopt(argc, argv, "as:")) != -1) {
     68 		switch (c) {
     69 		case 'a':
     70 			if (optind < argc)
     71 				usage();
     72 			dump_mode(-1);
     73 			return (0);
     74 		case 's':
     75 			m = atoi(optarg);
     76 			if (m == 0 || optind < argc)
     77 				usage();
     78 			set_mode(m);
     79 			return (0);
     80 		}
     81 	}
     82 
     83 	argc -= optind;
     84 	argv += optind;
     85 	if (argc != 1)
     86 		usage();
     87 
     88 	dump_mode(atoi(*argv));
     89 	return (0);
     90 }
     91 
     92 
     93 int
     94 get_grf()
     95 {
     96 	struct stat stb;
     97 	char grfname[80];
     98 	int grffd;
     99 
    100 	/* find out on which ite/grf we are */
    101 	if (fstat(0, &stb) == -1)
    102 		err(1, "fstat 0");
    103 	if (((stb.st_mode & S_IFMT) != S_IFCHR) || !isatty(0))
    104 		errx(1, "stdin not a tty");
    105 	if (major(stb.st_rdev) != 13)
    106 		errx(1, "stdin not an ite device");
    107 	(void)sprintf(grfname, "/dev/grf%d", minor(stb.st_rdev) & 0x7);
    108 	if ((grffd = open(grfname, 2)) < 0)
    109 		err(1, "%s", grfname);
    110 	return (grffd);
    111 }
    112 
    113 void
    114 dump_mode(m)
    115 	int m;
    116 {
    117 	struct grfvideo_mode vm;
    118 	int num_vm;
    119 	int grffd;
    120 
    121 	grffd = get_grf();
    122 
    123 	if (ioctl(grffd, GRFGETNUMVM, &num_vm) < 0)
    124 		err(1, "GRFGETNUMVM");
    125 	if (m > 0 && m > num_vm)
    126 		errx(1, "no such mode");
    127 	if (m <= 0) {
    128 		(void)printf("Current mode:\n");
    129 		vm.mode_num = 0;
    130 		if (ioctl(grffd, GRFGETVMODE, &vm) == 0)
    131 			dump_vm(&vm);
    132 		(void)printf("\n");
    133 	}
    134 	if (m >= 0)
    135 		return;
    136 	for (m = 1; m <= num_vm; m++) {
    137 		vm.mode_num = m;
    138 		if (ioctl(grffd, GRFGETVMODE, &vm) == -1)
    139 			break;
    140 		dump_vm(&vm);
    141 	}
    142 }
    143 
    144 void
    145 set_mode(m)
    146 	int m;
    147 {
    148 	int grffd;
    149 
    150 	grffd = get_grf();
    151 	(void)ioctl(grffd, GRFSETVMODE, &m);
    152 }
    153 
    154 void
    155 dump_vm(vm)
    156 	struct grfvideo_mode *vm;
    157 {
    158 	(void)printf("%d: %s\n", vm->mode_num, vm->mode_descr);
    159 	(void)printf(
    160 	    "pixel_clock = %lu, width = %d, height = %d, depth = %d\n",
    161 	    vm->pixel_clock, vm->disp_width, vm->disp_height, vm->depth);
    162 }
    163 
    164 void
    165 usage()
    166 {
    167 	(void)fprintf(stderr, "usage: videomode [mode]\n");
    168 	(void)fprintf(stderr, "usage: videomode -a\n");
    169 	(void)fprintf(stderr, "usage: videomode -s mode\n");
    170 	exit(0);
    171 }
    172