FreeBSD/Linux Kernel Cross Reference
sys/dev/dpms/dpms.c
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(®s);
196 regs.R_AX = VBE_DPMS_FUNCTION;
197 regs.R_BL = subfunction;
198 regs.R_BH = *bh;
199 x86bios_intr(®s, 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 }
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