xref: /freebsd/sys/dev/dpms/dpms.c (revision 7ef62cebc2f965b0f640263e179276928885e33d)
1 /*-
2  * SPDX-License-Identifier: BSD-3-Clause
3  *
4  * Copyright (c) 2008 Yahoo!, Inc.
5  * All rights reserved.
6  * Written by: John Baldwin <jhb@FreeBSD.org>
7  *
8  * Redistribution and use in source and binary forms, with or without
9  * modification, are permitted provided that the following conditions
10  * are met:
11  * 1. Redistributions of source code must retain the above copyright
12  *    notice, this list of conditions and the following disclaimer.
13  * 2. Redistributions in binary form must reproduce the above copyright
14  *    notice, this list of conditions and the following disclaimer in the
15  *    documentation and/or other materials provided with the distribution.
16  * 3. Neither the name of the author nor the names of any co-contributors
17  *    may be used to endorse or promote products derived from this software
18  *    without specific prior written permission.
19  *
20  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30  * SUCH DAMAGE.
31  */
32 
33 /*
34  * Copyright (c) 2004 Benjamin Close <Benjamin.Close@clearchain.com>
35  * All rights reserved.
36  *
37  * Redistribution and use in source and binary forms, with or without
38  * modification, are permitted provided that the following conditions
39  * are met:
40  * 1. Redistributions of source code must retain the above copyright
41  *    notice, this list of conditions and the following disclaimer.
42  * 2. Redistributions in binary form must reproduce the above copyright
43  *    notice, this list of conditions and the following disclaimer in the
44  *    documentation and/or other materials provided with the distribution.
45  *
46  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
47  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
48  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
49  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
50  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
51  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
52  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
53  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
54  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
55  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
56  * SUCH DAMAGE.
57  */
58 
59 /*
60  * Support for managing the display via DPMS for suspend/resume.
61  */
62 
63 #include <sys/cdefs.h>
64 __FBSDID("$FreeBSD$");
65 
66 #include <sys/param.h>
67 #include <sys/bus.h>
68 #include <sys/kernel.h>
69 #include <sys/libkern.h>
70 #include <sys/module.h>
71 
72 #include <compat/x86bios/x86bios.h>
73 
74 /*
75  * VESA DPMS States
76  */
77 #define DPMS_ON		0x00
78 #define DPMS_STANDBY	0x01
79 #define DPMS_SUSPEND	0x02
80 #define DPMS_OFF	0x04
81 #define DPMS_REDUCEDON	0x08
82 
83 #define	VBE_DPMS_FUNCTION	0x4F10
84 #define	VBE_DPMS_GET_SUPPORTED_STATES 0x00
85 #define	VBE_DPMS_GET_STATE	0x02
86 #define	VBE_DPMS_SET_STATE	0x01
87 #define VBE_MAJORVERSION_MASK	0x0F
88 #define VBE_MINORVERSION_MASK	0xF0
89 
90 struct dpms_softc {
91 	int	dpms_supported_states;
92 	int	dpms_initial_state;
93 };
94 
95 static int	dpms_attach(device_t);
96 static int	dpms_detach(device_t);
97 static int	dpms_get_supported_states(int *);
98 static int	dpms_get_current_state(int *);
99 static void	dpms_identify(driver_t *, device_t);
100 static int	dpms_probe(device_t);
101 static int	dpms_resume(device_t);
102 static int	dpms_set_state(int);
103 static int	dpms_suspend(device_t);
104 
105 static device_method_t dpms_methods[] = {
106 	DEVMETHOD(device_identify,	dpms_identify),
107 	DEVMETHOD(device_probe,		dpms_probe),
108 	DEVMETHOD(device_attach,	dpms_attach),
109 	DEVMETHOD(device_detach,	dpms_detach),
110 	DEVMETHOD(device_suspend,	dpms_suspend),
111 	DEVMETHOD(device_resume,	dpms_resume),
112 	{ 0, 0 }
113 };
114 
115 static driver_t dpms_driver = {
116 	"dpms",
117 	dpms_methods,
118 	sizeof(struct dpms_softc),
119 };
120 
121 DRIVER_MODULE(dpms, vgapm, dpms_driver, NULL, NULL);
122 MODULE_DEPEND(dpms, x86bios, 1, 1, 1);
123 
124 static void
125 dpms_identify(driver_t *driver, device_t parent)
126 {
127 
128 	if (x86bios_match_device(0xc0000, device_get_parent(parent)))
129 		device_add_child(parent, "dpms", 0);
130 }
131 
132 static int
133 dpms_probe(device_t dev)
134 {
135 	int error, states;
136 
137 	error = dpms_get_supported_states(&states);
138 	if (error)
139 		return (error);
140 	device_set_desc(dev, "DPMS suspend/resume");
141 	device_quiet(dev);
142 	return (BUS_PROBE_DEFAULT);
143 }
144 
145 static int
146 dpms_attach(device_t dev)
147 {
148 	struct dpms_softc *sc;
149 	int error;
150 
151 	sc = device_get_softc(dev);
152 	error = dpms_get_supported_states(&sc->dpms_supported_states);
153 	if (error)
154 		return (error);
155 	error = dpms_get_current_state(&sc->dpms_initial_state);
156 	return (error);
157 }
158 
159 static int
160 dpms_detach(device_t dev)
161 {
162 
163 	return (0);
164 }
165 
166 static int
167 dpms_suspend(device_t dev)
168 {
169 	struct dpms_softc *sc;
170 
171 	sc = device_get_softc(dev);
172 	if ((sc->dpms_supported_states & DPMS_OFF) != 0)
173 		dpms_set_state(DPMS_OFF);
174 	return (0);
175 }
176 
177 static int
178 dpms_resume(device_t dev)
179 {
180 	struct dpms_softc *sc;
181 
182 	sc = device_get_softc(dev);
183 	dpms_set_state(sc->dpms_initial_state);
184 	return (0);
185 }
186 
187 static int
188 dpms_call_bios(int subfunction, int *bh)
189 {
190 	x86regs_t regs;
191 
192 	if (x86bios_get_intr(0x10) == 0)
193 		return (ENXIO);
194 
195 	x86bios_init_regs(&regs);
196 	regs.R_AX = VBE_DPMS_FUNCTION;
197 	regs.R_BL = subfunction;
198 	regs.R_BH = *bh;
199 	x86bios_intr(&regs, 0x10);
200 
201 	if (regs.R_AX != 0x004f)
202 		return (ENXIO);
203 
204 	*bh = regs.R_BH;
205 
206 	return (0);
207 }
208 
209 static int
210 dpms_get_supported_states(int *states)
211 {
212 
213 	*states = 0;
214 	return (dpms_call_bios(VBE_DPMS_GET_SUPPORTED_STATES, states));
215 }
216 
217 static int
218 dpms_get_current_state(int *state)
219 {
220 
221 	*state = 0;
222 	return (dpms_call_bios(VBE_DPMS_GET_STATE, state));
223 }
224 
225 static int
226 dpms_set_state(int state)
227 {
228 
229 	return (dpms_call_bios(VBE_DPMS_SET_STATE, &state));
230 }
231