xref: /freebsd/sys/dev/syscons/green/green_saver.c (revision a8445737e740901f5f2c8d24c12ef7fc8b00134e)
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 
41 MOD_MISC(green_saver);
42 
43 static void
44 green_saver(int blank)
45 {
46 	u_char val;
47 	if (blank) {
48 		scrn_blanked = 1;
49 		switch (crtc_type) {
50 		case KD_VGA:
51 			outb(TSIDX, 0x01); val = inb(TSREG);
52 			outb(TSIDX, 0x01); outb(TSREG, val | 0x20);
53 			outb(crtc_addr, 0x17); val = inb(crtc_addr + 1);
54 			outb(crtc_addr + 1, val & ~0x80);
55 			break;
56 		case KD_EGA:
57 			/* not yet done XXX */
58 			break;
59 		case KD_CGA:
60 			outb(crtc_addr + 4, 0x25);
61 			break;
62 		case KD_MONO:
63 		case KD_HERCULES:
64 			outb(crtc_addr + 4, 0x21);
65 			break;
66 		default:
67 			break;
68 		}
69 	}
70 	else {
71 		switch (crtc_type) {
72 		case KD_VGA:
73 			outb(TSIDX, 0x01); val = inb(TSREG);
74 			outb(TSIDX, 0x01); outb(TSREG, val & 0xDF);
75 			outb(crtc_addr, 0x17); val = inb(crtc_addr + 1);
76 			outb(crtc_addr + 1, val | 0x80);
77 			break;
78 		case KD_EGA:
79 			/* not yet done XXX */
80 			break;
81 		case KD_CGA:
82 			outb(crtc_addr + 4, 0x2d);
83 			break;
84 		case KD_MONO:
85 		case KD_HERCULES:
86 			outb(crtc_addr + 4, 0x29);
87 			break;
88 		default:
89 			break;
90 		}
91 		scrn_blanked = 0;
92 	}
93 }
94 
95 static int
96 green_saver_load(struct lkm_table *lkmtp, int cmd)
97 {
98 	switch (crtc_type) {
99 	case KD_MONO:
100 	case KD_HERCULES:
101 	case KD_CGA:
102 		/*
103 		 * `green' saver is not fully implemented for MDA and CGA.
104 		 * It simply blanks the display instead.
105 		 */
106 	case KD_VGA:
107 		break;
108 	case KD_EGA:
109 		/* EGA is yet to be supported */
110 	default:
111 		return ENODEV;
112 	}
113 	return add_scrn_saver(green_saver);
114 }
115 
116 static int
117 green_saver_unload(struct lkm_table *lkmtp, int cmd)
118 {
119 	return remove_scrn_saver(green_saver);
120 }
121 
122 int
123 green_saver_mod(struct lkm_table *lkmtp, int cmd, int ver)
124 {
125 	MOD_DISPATCH(green_saver, lkmtp, cmd, ver,
126 		green_saver_load, green_saver_unload, lkm_nullcmd);
127 }
128