fade_saver.c revision 39287 
1/*-
2 * Copyright (c) 1995-1998 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 *    without modification, immediately at the beginning of the file.
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 without 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 *	$Id$
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(fade_saver);
42
43static void
44fade_saver(int blank)
45{
46	static int count = 0;
47	int i;
48
49	if (blank) {
50		scrn_blanked = 1;
51		switch (crtc_type) {
52		case KD_VGA:
53			if (count < 64) {
54				outb(PIXMASK, 0xFF);	/* no pixelmask */
55				outb(PALWADR, 0x00);
56				outb(PALDATA, 0);
57				outb(PALDATA, 0);
58				outb(PALDATA, 0);
59				for (i = 3; i < 768; i++) {
60					if (palette[i] - count > 15)
61						outb(PALDATA, palette[i]-count);
62					else
63						outb(PALDATA, 15);
64				}
65				inb(crtc_addr+6);	/* reset flip/flop */
66				outb(ATC, 0x20);	/* enable palette */
67				count++;
68			}
69			break;
70		case KD_EGA:
71			/* not yet done XXX */
72			break;
73		case KD_CGA:
74			outb(crtc_addr + 4, 0x25);
75			break;
76		case KD_MONO:
77		case KD_HERCULES:
78			outb(crtc_addr + 4, 0x21);
79			break;
80		default:
81			break;
82		}
83	}
84	else {
85		switch (crtc_type) {
86		case KD_VGA:
87			load_palette(cur_console, palette);
88			count = 0;
89			break;
90		case KD_EGA:
91			/* not yet done XXX */
92			break;
93		case KD_CGA:
94			outb(crtc_addr + 4, 0x2d);
95			break;
96		case KD_MONO:
97		case KD_HERCULES:
98			outb(crtc_addr + 4, 0x29);
99			break;
100		default:
101			break;
102		}
103		scrn_blanked = 0;
104	}
105}
106
107static int
108fade_saver_load(struct lkm_table *lkmtp, int cmd)
109{
110	switch (crtc_type) {
111	case KD_MONO:
112	case KD_HERCULES:
113	case KD_CGA:
114		/*
115		 * `fade' saver is not fully implemented for MDA and CGA.
116		 * It simply blanks the display instead.
117		 */
118	case KD_VGA:
119		break;
120	case KD_EGA:
121		/* EGA is yet to be supported */
122	default:
123		return ENODEV;
124	}
125	return add_scrn_saver(fade_saver);
126}
127
128static int
129fade_saver_unload(struct lkm_table *lkmtp, int cmd)
130{
131	return remove_scrn_saver(fade_saver);
132}
133
134int
135fade_saver_mod(struct lkm_table *lkmtp, int cmd, int ver)
136{
137	MOD_DISPATCH(fade_saver, lkmtp, cmd, ver,
138		fade_saver_load, fade_saver_unload, lkm_nullcmd);
139}
140