fade_saver.c revision 39428 
1258945Sroberto/*-
2258945Sroberto * Copyright (c) 1995-1998 S�ren Schmidt
3258945Sroberto * All rights reserved.
4258945Sroberto *
5258945Sroberto * Redistribution and use in source and binary forms, with or without
6258945Sroberto * modification, are permitted provided that the following conditions
7258945Sroberto * are met:
8258945Sroberto * 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: fade_saver.c,v 1.13 1998/09/15 18:16:39 sos 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(fade_saver);
42
43static void
44fade_saver(int blank)
45{
46	static int count = 0;
47	u_char pal[256*3];
48	int i;
49
50	if (blank) {
51		scrn_blanked = 1;
52		cur_console->status |= SAVER_RUNNING;
53		switch (crtc_type) {
54		case KD_VGA:
55			if (count < 64) {
56				pal[0] = pal[1] = pal[2] = 0;
57				for (i = 3; i < 256*3; i++) {
58					if (palette[i] - count > 60)
59						pal[i] = palette[i] - count;
60					else
61						pal[i] = 60;
62				}
63				load_palette(cur_console, pal);
64				count++;
65			}
66			break;
67		case KD_EGA:
68			/* not yet done XXX */
69			break;
70		case KD_CGA:
71			outb(crtc_addr + 4, 0x25);
72			break;
73		case KD_MONO:
74		case KD_HERCULES:
75			outb(crtc_addr + 4, 0x21);
76			break;
77		default:
78			break;
79		}
80	}
81	else {
82		switch (crtc_type) {
83		case KD_VGA:
84			load_palette(cur_console, palette);
85			count = 0;
86			break;
87		case KD_EGA:
88			/* not yet done XXX */
89			break;
90		case KD_CGA:
91			outb(crtc_addr + 4, 0x2d);
92			break;
93		case KD_MONO:
94		case KD_HERCULES:
95			outb(crtc_addr + 4, 0x29);
96			break;
97		default:
98			break;
99		}
100		cur_console->status &= ~SAVER_RUNNING;
101		scrn_blanked = 0;
102	}
103}
104
105static int
106fade_saver_load(struct lkm_table *lkmtp, int cmd)
107{
108	switch (crtc_type) {
109	case KD_MONO:
110	case KD_HERCULES:
111	case KD_CGA:
112		/*
113		 * `fade' saver is not fully implemented for MDA and CGA.
114		 * It simply blanks the display instead.
115		 */
116	case KD_VGA:
117		break;
118	case KD_EGA:
119		/* EGA is yet to be supported */
120	default:
121		return ENODEV;
122	}
123	return add_scrn_saver(fade_saver);
124}
125
126static int
127fade_saver_unload(struct lkm_table *lkmtp, int cmd)
128{
129	return remove_scrn_saver(fade_saver);
130}
131
132int
133fade_saver_mod(struct lkm_table *lkmtp, int cmd, int ver)
134{
135	MOD_DISPATCH(fade_saver, lkmtp, cmd, ver,
136		fade_saver_load, fade_saver_unload, lkm_nullcmd);
137}
138