/*-
 * Copyright (c) 1995-1997 Søren Schmidt
 * 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
 *    in this position and unchanged.
 * 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. The name of the author may not be used to endorse or promote products
 *    derived from this software withough 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.
 *
 * $FreeBSD: stable/2.2/lkm/syscons/fade/fade_saver.c 50952 1999-09-05 11:54:50Z peter $
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/exec.h>
#include <sys/sysent.h>
#include <sys/lkm.h>

#include <i386/isa/isa.h>

#include <saver.h>

MOD_MISC(fade_saver);

static void
fade_saver(int blank)
{
	static int count = 0;
	int i;

	if (blank) {
		scrn_blanked = 1;
		switch (crtc_type) {
		case KD_VGA:
			if (count < 64) {
				outb(PIXMASK, 0xFF);	/* no pixelmask */
				outb(PALWADR, 0x00);
				outb(PALDATA, 0);
				outb(PALDATA, 0);
				outb(PALDATA, 0);
				for (i = 3; i < 768; i++) {
					if (palette[i] - count > 15)
						outb(PALDATA, palette[i]-count);
					else
						outb(PALDATA, 15);
				}
				inb(crtc_addr+6);	/* reset flip/flop */
				outb(ATC, 0x20);	/* enable palette */
				count++;
			}
			break;
		case KD_EGA:
			/* not yet done XXX */
			break;
		case KD_CGA:
			outb(crtc_addr + 4, 0x25);
			break;
		case KD_MONO:
		case KD_HERCULES:
			outb(crtc_addr + 4, 0x21);
			break;
		default:
			break;
		}
	}
	else {
		switch (crtc_type) {
		case KD_VGA:
			load_palette(palette);
			count = 0;
			break;
		case KD_EGA:
			/* not yet done XXX */
			break;
		case KD_CGA:
			outb(crtc_addr + 4, 0x2d);
			break;
		case KD_MONO:
		case KD_HERCULES:
			outb(crtc_addr + 4, 0x29);
			break;
		default:
			break;
		}
		scrn_blanked = 0;
	}
}

static int
fade_saver_load(struct lkm_table *lkmtp, int cmd)
{
	switch (crtc_type) {
	case KD_MONO:
	case KD_HERCULES:
	case KD_CGA:
		/* 
		 * `fade' saver is not fully implemented for MDA and CGA.
		 * It simply blanks the display instead.
		 */
	case KD_VGA:
		break;
	case KD_EGA:
		/* EGA is yet to be supported */
	default:
		return ENODEV;
	}
	return add_scrn_saver(fade_saver);
}

static int
fade_saver_unload(struct lkm_table *lkmtp, int cmd)
{
	return remove_scrn_saver(fade_saver);
}

int
fade_saver_mod(struct lkm_table *lkmtp, int cmd, int ver)
{
	MOD_DISPATCH(fade_saver, lkmtp, cmd, ver,
		fade_saver_load, fade_saver_unload, lkm_nullcmd);
}
