/*      $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);
}