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/param.h> 64 #include <sys/bus.h> 65 #include <sys/kernel.h> 66 #include <sys/libkern.h> 67 #include <sys/module.h> 68 69 #include <compat/x86bios/x86bios.h> 70 71 /* 72 * VESA DPMS States 73 */ 74 #define DPMS_ON 0x00 75 #define DPMS_STANDBY 0x01 76 #define DPMS_SUSPEND 0x02 77 #define DPMS_OFF 0x04 78 #define DPMS_REDUCEDON 0x08 79 80 #define VBE_DPMS_FUNCTION 0x4F10 81 #define VBE_DPMS_GET_SUPPORTED_STATES 0x00 82 #define VBE_DPMS_GET_STATE 0x02 83 #define VBE_DPMS_SET_STATE 0x01 84 #define VBE_MAJORVERSION_MASK 0x0F 85 #define VBE_MINORVERSION_MASK 0xF0 86 87 struct dpms_softc { 88 int dpms_supported_states; 89 int dpms_initial_state; 90 }; 91 92 static int dpms_attach(device_t); 93 static int dpms_detach(device_t); 94 static int dpms_get_supported_states(int *); 95 static int dpms_get_current_state(int *); 96 static void dpms_identify(driver_t *, device_t); 97 static int dpms_probe(device_t); 98 static int dpms_resume(device_t); 99 static int dpms_set_state(int); 100 static int dpms_suspend(device_t); 101 102 static device_method_t dpms_methods[] = { 103 DEVMETHOD(device_identify, dpms_identify), 104 DEVMETHOD(device_probe, dpms_probe), 105 DEVMETHOD(device_attach, dpms_attach), 106 DEVMETHOD(device_detach, dpms_detach), 107 DEVMETHOD(device_suspend, dpms_suspend), 108 DEVMETHOD(device_resume, dpms_resume), 109 { 0, 0 } 110 }; 111 112 static driver_t dpms_driver = { 113 "dpms", 114 dpms_methods, 115 sizeof(struct dpms_softc), 116 }; 117 118 DRIVER_MODULE(dpms, vgapm, dpms_driver, NULL, NULL); 119 MODULE_DEPEND(dpms, x86bios, 1, 1, 1); 120 121 static void 122 dpms_identify(driver_t *driver, device_t parent) 123 { 124 125 if (x86bios_match_device(0xc0000, device_get_parent(parent))) 126 device_add_child(parent, "dpms", 0); 127 } 128 129 static int 130 dpms_probe(device_t dev) 131 { 132 int error, states; 133 134 error = dpms_get_supported_states(&states); 135 if (error) 136 return (error); 137 device_set_desc(dev, "DPMS suspend/resume"); 138 device_quiet(dev); 139 return (BUS_PROBE_DEFAULT); 140 } 141 142 static int 143 dpms_attach(device_t dev) 144 { 145 struct dpms_softc *sc; 146 int error; 147 148 sc = device_get_softc(dev); 149 error = dpms_get_supported_states(&sc->dpms_supported_states); 150 if (error) 151 return (error); 152 error = dpms_get_current_state(&sc->dpms_initial_state); 153 return (error); 154 } 155 156 static int 157 dpms_detach(device_t dev) 158 { 159 160 return (0); 161 } 162 163 static int 164 dpms_suspend(device_t dev) 165 { 166 struct dpms_softc *sc; 167 168 sc = device_get_softc(dev); 169 if ((sc->dpms_supported_states & DPMS_OFF) != 0) 170 dpms_set_state(DPMS_OFF); 171 return (0); 172 } 173 174 static int 175 dpms_resume(device_t dev) 176 { 177 struct dpms_softc *sc; 178 179 sc = device_get_softc(dev); 180 dpms_set_state(sc->dpms_initial_state); 181 return (0); 182 } 183 184 static int 185 dpms_call_bios(int subfunction, int *bh) 186 { 187 x86regs_t regs; 188 189 if (x86bios_get_intr(0x10) == 0) 190 return (ENXIO); 191 192 x86bios_init_regs(®s); 193 regs.R_AX = VBE_DPMS_FUNCTION; 194 regs.R_BL = subfunction; 195 regs.R_BH = *bh; 196 x86bios_intr(®s, 0x10); 197 198 if (regs.R_AX != 0x004f) 199 return (ENXIO); 200 201 *bh = regs.R_BH; 202 203 return (0); 204 } 205 206 static int 207 dpms_get_supported_states(int *states) 208 { 209 210 *states = 0; 211 return (dpms_call_bios(VBE_DPMS_GET_SUPPORTED_STATES, states)); 212 } 213 214 static int 215 dpms_get_current_state(int *state) 216 { 217 218 *state = 0; 219 return (dpms_call_bios(VBE_DPMS_GET_STATE, state)); 220 } 221 222 static int 223 dpms_set_state(int state) 224 { 225 226 return (dpms_call_bios(VBE_DPMS_SET_STATE, &state)); 227 } 228