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videomode.c revision 1.1 
      1 /*	$NetBSD: videomode.c,v 1.1 1995/10/09 00:50:08 chopps Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1995 Christian E. Hopps
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  *      This product includes software developed by Christian E. Hopps.
     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/types.h>
     34 #include <sys/stat.h>
     35 #include <sys/ioctl.h>
     36 #include <sys/device.h>
     37 #include <amiga/dev/grfioctl.h>
     38 #include <amiga/dev/grfvar.h>
     39 
     40 #include <unistd.h>
     41 #include <errno.h>
     42 #include <err.h>
     43 #include <stdio.h>
     44 
     45 void dump_mode __P((int));
     46 void dump_vm   __P((struct grfvideo_mode *));
     47 int  get_grf __P((void));
     48 void set_mode __P((int));
     49 void usage __P((void));
     50 
     51 int
     52 main(argc, argv)
     53 	int argc;
     54 	char *argv[];
     55 {
     56 	int m;
     57 	int c;
     58 
     59 	if (argc == 1) {
     60 		dump_mode(0);
     61 		return (0);
     62 	}
     63 	while ((c = getopt(argc, argv, "as:")) != EOF) {
     64 		switch (c) {
     65 		case 'a':
     66 			if (optind < argc)
     67 				usage();
     68 			dump_mode(-1);
     69 			return (0);
     70 		case 's':
     71 			m = atoi(optarg);
     72 			if (m == 0 || optind < argc)
     73 				usage();
     74 			set_mode(m);
     75 			return (0);
     76 		}
     77 	}
     78 
     79 	argc -= optind;
     80 	argv += optind;
     81 	if (argc != 1)
     82 		usage();
     83 
     84 	dump_mode(atoi(*argv));
     85 	return (0);
     86 }
     87 
     88 
     89 int
     90 get_grf()
     91 {
     92 	struct stat stb;
     93 	char grfname[80];
     94 	int grffd;
     95 
     96 	/* find out on which ite/grf we are */
     97 	if (fstat(0, &stb) == -1)
     98 		err(1, "fstat 0");
     99 	if (((stb.st_mode & S_IFMT) != S_IFCHR) || !isatty(0))
    100 		errx(1, "stdin not a tty");
    101 	if (major(stb.st_rdev) != 13)
    102 		errx(1, "stdin not an ite device");
    103 	(void)sprintf(grfname, "/dev/grf%d", minor(stb.st_rdev) & 0x7);
    104 	if ((grffd = open(grfname, 2)) < 0)
    105 		err(1, "%s", grfname);
    106 	return (grffd);
    107 }
    108 
    109 void
    110 dump_mode(m)
    111 	int m;
    112 {
    113 	struct grfvideo_mode vm;
    114 	int num_vm;
    115 	int grffd;
    116 
    117 	grffd = get_grf();
    118 
    119 	if (ioctl(grffd, GRFGETNUMVM, &num_vm) < 0)
    120 		err(1, "GRFGETNUMVM");
    121 	if (m > 0 && m > num_vm)
    122 		errx(1, "no such mode");
    123 	if (m <= 0) {
    124 		(void)printf("Current mode:\n");
    125 		vm.mode_num = 0;
    126 		if (ioctl(grffd, GRFGETVMODE, &vm) == 0)
    127 			dump_vm(&vm);
    128 		(void)printf("\n");
    129 	}
    130 	if (m >= 0)
    131 		return;
    132 	for (m = 1; m <= num_vm; m++) {
    133 		vm.mode_num = m;
    134 		if (ioctl(grffd, GRFGETVMODE, &vm) == -1)
    135 			break;
    136 		dump_vm(&vm);
    137 	}
    138 }
    139 
    140 void
    141 set_mode(m)
    142 	int m;
    143 {
    144 	int grffd;
    145 
    146 	grffd = get_grf();
    147 	(void)ioctl(grffd, GRFSETVMODE, &m);
    148 }
    149 
    150 void
    151 dump_vm(vm)
    152 	struct grfvideo_mode *vm;
    153 {
    154 	(void)printf("%d: %s\n", vm->mode_num, vm->mode_descr);
    155 	(void)printf("pixel_clock = %u, width = %d, height = %d, depth = %d\n",
    156 	    vm->pixel_clock, vm->disp_width, vm->disp_height, vm->depth);
    157 }
    158 
    159 void
    160 usage()
    161 {
    162 	(void)fprintf(stderr, "usage: videomode [mode]\n");
    163 	(void)fprintf(stderr, "usage: videomode -a\n");
    164 	(void)fprintf(stderr, "usage: videomode -s mode\n");
    165 	exit(0);
    166 }
    167