/*      $NetBSD: videomode.c,v 1.9 2018/01/23 21:06:26 sevan Exp $      */

/*
* Copyright (c) 1995 Christian E. Hopps
* Copyright (c) 1994 Markus Wild
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
*    must display the following acknowledgement:
*      This product includes software developed by Markus Wild
* 4. The name of the author may not be used to endorse or promote products
*    derived from this software without specific prior written permission
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

#include <sys/types.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <sys/device.h>
#include <amiga/dev/grfioctl.h>
#include <amiga/dev/grfvar.h>

#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

void    dump_mode(int);
void    dump_vm(struct grfvideo_mode *);
int     get_grf(void);
void    set_mode(int);
void    usage(void) __dead;

int
main(int argc, char *argv[])
{
       int m;
       int c;

       if (argc == 1) {
               dump_mode(0);
               return (0);
       }
       while ((c = getopt(argc, argv, "as:")) != -1) {
               switch (c) {
               case 'a':
                       if (optind < argc)
                               usage();
                       dump_mode(-1);
                       return (0);
               case 's':
                       m = atoi(optarg);
                       if (m == 0 || optind < argc)
                               usage();
                       set_mode(m);
                       return (0);
               }
       }

       argc -= optind;
       argv += optind;
       if (argc != 1)
               usage();

       dump_mode(atoi(*argv));
       return (0);
}


int
get_grf()
{
       struct stat stb;
       char grfname[80];
       int grffd;

       /* find out on which ite/grf we are */
       if (fstat(0, &stb) == -1)
               err(1, "fstat 0");
       if (!S_ISCHR(stb.st_mode) || !isatty(0))
               errx(1, "stdin not a tty");
       if (major(stb.st_rdev) != 13)
               errx(1, "stdin not an ite device");
       (void)snprintf(grfname, sizeof(grfname), "/dev/grf%u",
           (u_int)minor(stb.st_rdev) & 0x7);
       if ((grffd = open(grfname, 2)) < 0)
               err(1, "%s", grfname);
       return (grffd);
}

void
dump_mode(int m)
{
       struct grfvideo_mode vm;
       int num_vm;
       int grffd;

       grffd = get_grf();

       if (ioctl(grffd, GRFGETNUMVM, &num_vm) < 0)
               err(1, "GRFGETNUMVM");
       if (m > 0 && m > num_vm)
               errx(1, "no such mode");
       if (m <= 0) {
               (void)printf("Current mode:\n");
               vm.mode_num = 0;
               if (ioctl(grffd, GRFGETVMODE, &vm) == 0)
                       dump_vm(&vm);
               (void)printf("\n");
       }
       if (m >= 0) {
               (void)close(grffd);
               return;
       }
       for (m = 1; m <= num_vm; m++) {
               vm.mode_num = m;
               if (ioctl(grffd, GRFGETVMODE, &vm) == -1)
                       break;
               dump_vm(&vm);
       }
       (void)close(grffd);
}

void
set_mode(int m)
{
       int grffd;

       grffd = get_grf();
       (void)ioctl(grffd, GRFSETVMODE, &m);
       (void)close(grffd);
}

void
dump_vm(struct grfvideo_mode *vm)
{
       (void)printf("%d: %s\n", vm->mode_num, vm->mode_descr);
       (void)printf(
           "pixel_clock = %lu, width = %d, height = %d, depth = %d\n",
           vm->pixel_clock, vm->disp_width, vm->disp_height, vm->depth);
}

void
usage()
{
       (void)fprintf(stderr, "usage: videomode [mode]\n");
       (void)fprintf(stderr, "usage: videomode -a\n");
       (void)fprintf(stderr, "usage: videomode -s mode\n");
       exit(0);
}