green_saver.c revision 27427 
1/*-
2 * Copyright (c) 1995 S�ren Schmidt
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer
10 *    in this position and unchanged.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 * 3. The name of the author may not be used to endorse or promote products
15 *    derived from this software withough specific prior written permission
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 *
28 *	$Id: green_saver.c,v 1.9 1997/04/06 10:49:13 dufault Exp $
29 */
30
31#include <sys/param.h>
32#include <sys/systm.h>
33#include <sys/exec.h>
34#include <sys/sysent.h>
35#include <sys/lkm.h>
36
37#include <i386/isa/isa.h>
38
39#include <saver.h>
40
41MOD_MISC(green_saver);
42
43static void
44green_saver(int blank)
45{
46	u_char val;
47	if (blank) {
48		scrn_blanked = 1;
49		outb(TSIDX, 0x01); val = inb(TSREG);
50		outb(TSIDX, 0x01); outb(TSREG, val | 0x20);
51		outb(crtc_addr, 0x17); val = inb(crtc_addr + 1);
52		outb(crtc_addr + 1, val & ~0x80);
53	}
54	else {
55		outb(TSIDX, 0x01); val = inb(TSREG);
56		outb(TSIDX, 0x01); outb(TSREG, val & 0xDF);
57		outb(crtc_addr, 0x17); val = inb(crtc_addr + 1);
58		outb(crtc_addr + 1, val | 0x80);
59		scrn_blanked = 0;
60	}
61}
62
63static int
64green_saver_load(struct lkm_table *lkmtp, int cmd)
65{
66	if (!crtc_vga)
67		return EINVAL;
68	return add_scrn_saver(green_saver);
69}
70
71static int
72green_saver_unload(struct lkm_table *lkmtp, int cmd)
73{
74	return remove_scrn_saver(green_saver);
75}
76
77int
78green_saver_mod(struct lkm_table *lkmtp, int cmd, int ver)
79{
80	MOD_DISPATCH(green_saver, lkmtp, cmd, ver,
81		green_saver_load, green_saver_unload, lkm_nullcmd);
82}
83