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  * Copyright (c) 2008 Yahoo!, Inc.
    3  * All rights reserved.
    4  * Written by: John Baldwin <jhb@FreeBSD.org>
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions
    8  * are met:
    9  * 1. Redistributions of source code must retain the above copyright
   10  *    notice, this list of conditions and the following disclaimer.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  * 3. Neither the name of the author nor the names of any co-contributors
   15  *    may be used to endorse or promote products derived from this software
   16  *    without specific prior written permission.
   17  *
   18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   19  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   21  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   22  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   23  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   24  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   26  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   27  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   28  * SUCH DAMAGE.
   29  */
   30 
   31 /*
   32  * Copyright (c) 2004 Benjamin Close <Benjamin.Close@clearchain.com>
   33  * All rights reserved.
   34  *
   35  * Redistribution and use in source and binary forms, with or without
   36  * modification, are permitted provided that the following conditions
   37  * are met:
   38  * 1. Redistributions of source code must retain the above copyright
   39  *    notice, this list of conditions and the following disclaimer.
   40  * 2. Redistributions in binary form must reproduce the above copyright
   41  *    notice, this list of conditions and the following disclaimer in the
   42  *    documentation and/or other materials provided with the distribution.
   43  *
   44  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   45  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   46  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   47  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   48  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   49  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   50  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   51  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   52  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   53  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   54  * SUCH DAMAGE.
   55  */
   56 
   57 /*
   58  * Support for managing the display via DPMS for suspend/resume.
   59  */
   60 
   61 #include <sys/cdefs.h>
   62 __FBSDID("$FreeBSD: releng/11.1/sys/dev/dpms/dpms.c 200584 2009-12-15 19:58:23Z jkim $");
   63 
   64 #include <sys/param.h>
   65 #include <sys/bus.h>
   66 #include <sys/kernel.h>
   67 #include <sys/libkern.h>
   68 #include <sys/module.h>
   69 
   70 #include <compat/x86bios/x86bios.h>
   71 
   72 /*
   73  * VESA DPMS States 
   74  */
   75 #define DPMS_ON         0x00
   76 #define DPMS_STANDBY    0x01
   77 #define DPMS_SUSPEND    0x02
   78 #define DPMS_OFF        0x04
   79 #define DPMS_REDUCEDON  0x08
   80 
   81 #define VBE_DPMS_FUNCTION       0x4F10
   82 #define VBE_DPMS_GET_SUPPORTED_STATES 0x00
   83 #define VBE_DPMS_GET_STATE      0x02
   84 #define VBE_DPMS_SET_STATE      0x01
   85 #define VBE_MAJORVERSION_MASK   0x0F
   86 #define VBE_MINORVERSION_MASK   0xF0
   87 
   88 struct dpms_softc {
   89         int     dpms_supported_states;
   90         int     dpms_initial_state;
   91 };
   92 
   93 static int      dpms_attach(device_t);
   94 static int      dpms_detach(device_t);
   95 static int      dpms_get_supported_states(int *);
   96 static int      dpms_get_current_state(int *);
   97 static void     dpms_identify(driver_t *, device_t);
   98 static int      dpms_probe(device_t);
   99 static int      dpms_resume(device_t);
  100 static int      dpms_set_state(int);
  101 static int      dpms_suspend(device_t);
  102 
  103 static device_method_t dpms_methods[] = {
  104         DEVMETHOD(device_identify,      dpms_identify),
  105         DEVMETHOD(device_probe,         dpms_probe),
  106         DEVMETHOD(device_attach,        dpms_attach),
  107         DEVMETHOD(device_detach,        dpms_detach),
  108         DEVMETHOD(device_suspend,       dpms_suspend),
  109         DEVMETHOD(device_resume,        dpms_resume),
  110         { 0, 0 }
  111 };
  112 
  113 static driver_t dpms_driver = {
  114         "dpms",
  115         dpms_methods,
  116         sizeof(struct dpms_softc),
  117 };
  118 
  119 static devclass_t dpms_devclass;
  120 
  121 DRIVER_MODULE(dpms, vgapm, dpms_driver, dpms_devclass, 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 }

Cache object: 72154a20194f0e1cd7cfe1cfc8a1b52d


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