The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/dev/dpms/dpms.c

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    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: head/sys/dev/dpms/dpms.c 326022 2017-11-20 19:36:21Z pfg $");
   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 static devclass_t dpms_devclass;
  122 
  123 DRIVER_MODULE(dpms, vgapm, dpms_driver, dpms_devclass, NULL, NULL);
  124 MODULE_DEPEND(dpms, x86bios, 1, 1, 1);
  125 
  126 static void
  127 dpms_identify(driver_t *driver, device_t parent)
  128 {
  129 
  130         if (x86bios_match_device(0xc0000, device_get_parent(parent)))
  131                 device_add_child(parent, "dpms", 0);
  132 }
  133 
  134 static int
  135 dpms_probe(device_t dev)
  136 {
  137         int error, states;
  138 
  139         error = dpms_get_supported_states(&states);
  140         if (error)
  141                 return (error);
  142         device_set_desc(dev, "DPMS suspend/resume");
  143         device_quiet(dev);
  144         return (BUS_PROBE_DEFAULT);
  145 }
  146 
  147 static int
  148 dpms_attach(device_t dev)
  149 {
  150         struct dpms_softc *sc;
  151         int error;
  152 
  153         sc = device_get_softc(dev);
  154         error = dpms_get_supported_states(&sc->dpms_supported_states);
  155         if (error)
  156                 return (error);
  157         error = dpms_get_current_state(&sc->dpms_initial_state);
  158         return (error);
  159 }
  160 
  161 static int
  162 dpms_detach(device_t dev)
  163 {
  164 
  165         return (0);
  166 }
  167 
  168 static int
  169 dpms_suspend(device_t dev)
  170 {
  171         struct dpms_softc *sc;
  172 
  173         sc = device_get_softc(dev);
  174         if ((sc->dpms_supported_states & DPMS_OFF) != 0)
  175                 dpms_set_state(DPMS_OFF);
  176         return (0);
  177 }
  178 
  179 static int
  180 dpms_resume(device_t dev)
  181 {
  182         struct dpms_softc *sc;
  183 
  184         sc = device_get_softc(dev);
  185         dpms_set_state(sc->dpms_initial_state);
  186         return (0);
  187 }
  188 
  189 static int
  190 dpms_call_bios(int subfunction, int *bh)
  191 {
  192         x86regs_t regs;
  193 
  194         if (x86bios_get_intr(0x10) == 0)
  195                 return (ENXIO);
  196 
  197         x86bios_init_regs(&regs);
  198         regs.R_AX = VBE_DPMS_FUNCTION;
  199         regs.R_BL = subfunction;
  200         regs.R_BH = *bh;
  201         x86bios_intr(&regs, 0x10);
  202 
  203         if (regs.R_AX != 0x004f)
  204                 return (ENXIO);
  205 
  206         *bh = regs.R_BH;
  207 
  208         return (0);
  209 }
  210 
  211 static int
  212 dpms_get_supported_states(int *states)
  213 {
  214 
  215         *states = 0;
  216         return (dpms_call_bios(VBE_DPMS_GET_SUPPORTED_STATES, states));
  217 }
  218 
  219 static int
  220 dpms_get_current_state(int *state)
  221 {
  222 
  223         *state = 0;
  224         return (dpms_call_bios(VBE_DPMS_GET_STATE, state));
  225 }
  226 
  227 static int
  228 dpms_set_state(int state)
  229 {
  230 
  231         return (dpms_call_bios(VBE_DPMS_SET_STATE, &state));
  232 }

Cache object: 7537b020919673df9184e0db073285d1


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