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/i386/isa/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("$FreeBSD$");
   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 <machine/vm86.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, vgapci, dpms_driver, dpms_devclass, NULL, NULL);
  122 
  123 static void
  124 dpms_identify(driver_t *driver, device_t parent)
  125 {
  126 
  127         /*
  128          * XXX: The DPMS VBE only allows for manipulating a single
  129          * monitor, but we don't know which one.  Just attach to the
  130          * first vgapci(4) device we encounter and hope it is the
  131          * right one.
  132          */
  133         if (devclass_get_device(dpms_devclass, 0) == NULL)
  134                 device_add_child(parent, "dpms", 0);
  135 }
  136 
  137 static int
  138 dpms_probe(device_t dev)
  139 {
  140         int error, states;
  141 
  142         error = dpms_get_supported_states(&states);
  143         if (error)
  144                 return (error);
  145         device_set_desc(dev, "DPMS suspend/resume");
  146         device_quiet(dev);
  147         return (BUS_PROBE_DEFAULT);
  148 }
  149 
  150 static int
  151 dpms_attach(device_t dev)
  152 {
  153         struct dpms_softc *sc;
  154         int error;
  155 
  156         sc = device_get_softc(dev);
  157         error = dpms_get_supported_states(&sc->dpms_supported_states);
  158         if (error)
  159                 return (error);
  160         error = dpms_get_current_state(&sc->dpms_initial_state);
  161         return (error);
  162 }
  163 
  164 static int
  165 dpms_detach(device_t dev)
  166 {
  167 
  168         return (0);
  169 }
  170 
  171 static int
  172 dpms_suspend(device_t dev)
  173 {
  174 
  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         struct vm86frame vmf;
  193         int error;
  194 
  195         bzero(&vmf, sizeof(vmf));
  196         vmf.vmf_ax = VBE_DPMS_FUNCTION;
  197         vmf.vmf_bl = subfunction;
  198         vmf.vmf_bh = *bh;
  199         vmf.vmf_es = 0;
  200         vmf.vmf_di = 0;
  201         error = vm86_intcall(0x10, &vmf);
  202         if (error == 0 && (vmf.vmf_eax & 0xffff) != 0x004f)
  203                 error = ENXIO;
  204         if (error == 0)
  205                 *bh = vmf.vmf_bh;
  206         return (error);
  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: d765ce036f6ca3b9b683478d16d3b675


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