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 } 231