usr.sbin/videomode/videomode.c

   1 /*      $NetBSD: videomode.c,v 1.6 2009/01/14 22:57:48 he 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 (!S_ISCHR(stb.st_mode) || !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)snprintf(grfname, sizeof(grfname), "/dev/grf%u",
 108             (u_int)minor(stb.st_rdev) & 0x7);
 109         if ((grffd = open(grfname, 2)) < 0)
 110                 err(1, "%s", grfname);
 111         return (grffd);
 112 }
 113
 114 void
 115 dump_mode(m)
 116         int m;
 117 {
 118         struct grfvideo_mode vm;
 119         int num_vm;
 120         int grffd;
 121
 122         grffd = get_grf();
 123
 124         if (ioctl(grffd, GRFGETNUMVM, &num_vm) < 0)
 125                 err(1, "GRFGETNUMVM");
 126         if (m > 0 && m > num_vm)
 127                 errx(1, "no such mode");
 128         if (m <= 0) {
 129                 (void)printf("Current mode:\n");
 130                 vm.mode_num = 0;
 131                 if (ioctl(grffd, GRFGETVMODE, &vm) == 0)
 132                         dump_vm(&vm);
 133                 (void)printf("\n");
 134         }
 135         if (m >= 0)
 136                 return;
 137         for (m = 1; m <= num_vm; m++) {
 138                 vm.mode_num = m;
 139                 if (ioctl(grffd, GRFGETVMODE, &vm) == -1)
 140                         break;
 141                 dump_vm(&vm);
 142         }
 143 }
 144
 145 void
 146 set_mode(m)
 147         int m;
 148 {
 149         int grffd;
 150
 151         grffd = get_grf();
 152         (void)ioctl(grffd, GRFSETVMODE, &m);
 153 }
 154
 155 void
 156 dump_vm(vm)
 157         struct grfvideo_mode *vm;
 158 {
 159         (void)printf("%d: %s\n", vm->mode_num, vm->mode_descr);
 160         (void)printf(
 161             "pixel_clock = %lu, width = %d, height = %d, depth = %d\n",
 162             vm->pixel_clock, vm->disp_width, vm->disp_height, vm->depth);
 163 }
 164
 165 void
 166 usage()
 167 {
 168         (void)fprintf(stderr, "usage: videomode [mode]\n");
 169         (void)fprintf(stderr, "usage: videomode -a\n");
 170         (void)fprintf(stderr, "usage: videomode -s mode\n");
 171         exit(0);
 172 }