The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/dev/acpica/acpi_video.c

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    1 /*-
    2  * Copyright (c) 2002-2003 Taku YAMAMOTO <taku@cent.saitama-u.ac.jp>
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  *
   26  *      $Id: acpi_vid.c,v 1.4 2003/10/13 10:07:36 taku Exp $
   27  */
   28 
   29 #include <sys/cdefs.h>
   30 __FBSDID("$FreeBSD: releng/6.0/sys/dev/acpica/acpi_video.c 143002 2005-03-02 09:22:34Z obrien $");
   31 
   32 #include <sys/param.h>
   33 #include <sys/kernel.h>
   34 #include <sys/malloc.h>
   35 #include <sys/module.h>
   36 #include <sys/bus.h>
   37 #include <sys/power.h>
   38 #include <sys/queue.h>
   39 #include <sys/sysctl.h>
   40 
   41 #include "acpi.h"
   42 #include <dev/acpica/acpivar.h>
   43 
   44 /* ACPI video extension driver. */
   45 struct acpi_video_output {
   46         ACPI_HANDLE     handle;
   47         UINT32          adr;
   48         STAILQ_ENTRY(acpi_video_output) vo_next;
   49         struct {
   50                 int     num;
   51                 STAILQ_ENTRY(acpi_video_output) next;
   52         } vo_unit;
   53         int             vo_brightness;
   54         int             vo_fullpower;
   55         int             vo_economy;
   56         int             vo_numlevels;
   57         int             *vo_levels;
   58         struct sysctl_ctx_list vo_sysctl_ctx;
   59         struct sysctl_oid *vo_sysctl_tree;
   60 };
   61 
   62 STAILQ_HEAD(acpi_video_output_queue, acpi_video_output);
   63 
   64 struct acpi_video_softc {
   65         device_t                device;
   66         ACPI_HANDLE             handle;
   67         struct acpi_video_output_queue vid_outputs;
   68         eventhandler_tag        vid_pwr_evh;
   69 };
   70 
   71 /* interfaces */
   72 static int      acpi_video_modevent(struct module*, int, void *);
   73 static int      acpi_video_probe(device_t);
   74 static int      acpi_video_attach(device_t);
   75 static int      acpi_video_detach(device_t);
   76 static int      acpi_video_shutdown(device_t);
   77 static void     acpi_video_notify_handler(ACPI_HANDLE, UINT32, void *);
   78 static void     acpi_video_power_profile(void *);
   79 static void     acpi_video_bind_outputs(struct acpi_video_softc *);
   80 static struct acpi_video_output *acpi_video_vo_init(UINT32);
   81 static void     acpi_video_vo_bind(struct acpi_video_output *, ACPI_HANDLE);
   82 static void     acpi_video_vo_destroy(struct acpi_video_output *);
   83 static int      acpi_video_vo_check_level(struct acpi_video_output *, int);
   84 static int      acpi_video_vo_active_sysctl(SYSCTL_HANDLER_ARGS);
   85 static int      acpi_video_vo_bright_sysctl(SYSCTL_HANDLER_ARGS);
   86 static int      acpi_video_vo_presets_sysctl(SYSCTL_HANDLER_ARGS);
   87 static int      acpi_video_vo_levels_sysctl(SYSCTL_HANDLER_ARGS);
   88 
   89 /* operations */
   90 static void     vid_set_switch_policy(ACPI_HANDLE, UINT32);
   91 static int      vid_enum_outputs(ACPI_HANDLE,
   92                     void(*)(ACPI_HANDLE, UINT32, void *), void *);
   93 static int      vo_get_brightness_levels(ACPI_HANDLE, int **);
   94 static void     vo_set_brightness(ACPI_HANDLE, int);
   95 static UINT32   vo_get_device_status(ACPI_HANDLE);
   96 static UINT32   vo_get_graphics_state(ACPI_HANDLE);
   97 static void     vo_set_device_state(ACPI_HANDLE, UINT32);
   98 
   99 /* events */
  100 #define VID_NOTIFY_SWITCHED     0x80
  101 #define VID_NOTIFY_REPROBE      0x81
  102 
  103 /* _DOS (Enable/Disable Output Switching) argument bits */
  104 #define DOS_SWITCH_MASK         3
  105 #define DOS_SWITCH_BY_OSPM      0
  106 #define DOS_SWITCH_BY_BIOS      1
  107 #define DOS_SWITCH_LOCKED       2
  108 #define DOS_BRIGHTNESS_BY_BIOS  (1 << 2)
  109 
  110 /* _DOD and subdev's _ADR */
  111 #define DOD_DEVID_MASK          0xffff
  112 #define DOD_DEVID_MONITOR       0x0100
  113 #define DOD_DEVID_PANEL         0x0110
  114 #define DOD_DEVID_TV            0x0200
  115 #define DOD_BIOS                (1 << 16)
  116 #define DOD_NONVGA              (1 << 17)
  117 #define DOD_HEAD_ID_SHIFT       18
  118 #define DOD_HEAD_ID_BITS        3
  119 #define DOD_HEAD_ID_MASK \
  120                 (((1 << DOD_HEAD_ID_BITS) - 1) << DOD_HEAD_ID_SHIFT)
  121 
  122 /* _BCL related constants */
  123 #define BCL_FULLPOWER           0
  124 #define BCL_ECONOMY             1
  125 
  126 /* _DCS (Device Currrent Status) value bits and masks. */
  127 #define DCS_EXISTS              (1 << 0)
  128 #define DCS_ACTIVE              (1 << 1)
  129 #define DCS_READY               (1 << 2)
  130 #define DCS_FUNCTIONAL          (1 << 3)
  131 #define DCS_ATTACHED            (1 << 4)
  132 
  133 /* _DSS (Device Set Status) argument bits and masks. */
  134 #define DSS_INACTIVE            0
  135 #define DSS_ACTIVE              (1 << 0)
  136 #define DSS_SETNEXT             (1 << 30)
  137 #define DSS_COMMIT              (1 << 31)
  138 
  139 static device_method_t acpi_video_methods[] = {
  140         DEVMETHOD(device_probe, acpi_video_probe),
  141         DEVMETHOD(device_attach, acpi_video_attach),
  142         DEVMETHOD(device_detach, acpi_video_detach),
  143         DEVMETHOD(device_shutdown, acpi_video_shutdown),
  144         { 0, 0 }
  145 };
  146 
  147 static driver_t acpi_video_driver = {
  148         "acpi_video",
  149         acpi_video_methods,
  150         sizeof(struct acpi_video_softc),
  151 };
  152 
  153 static devclass_t acpi_video_devclass;
  154 
  155 DRIVER_MODULE(acpi_video, pci, acpi_video_driver, acpi_video_devclass,
  156               acpi_video_modevent, NULL);
  157 MODULE_DEPEND(acpi_video, acpi, 1, 1, 1);
  158 
  159 static struct sysctl_ctx_list   acpi_video_sysctl_ctx;
  160 static struct sysctl_oid        *acpi_video_sysctl_tree;
  161 static struct acpi_video_output_queue lcd_units, crt_units, tv_units,
  162     other_units;
  163 
  164 ACPI_SERIAL_DECL(video, "ACPI video");
  165 MALLOC_DEFINE(M_ACPIVIDEO, "acpivideo", "ACPI video extension");
  166 
  167 static int
  168 acpi_video_modevent(struct module *mod __unused, int evt, void *cookie __unused)
  169 {
  170         int err;
  171 
  172         err = 0;
  173         switch (evt) {
  174         case MOD_LOAD:
  175                 sysctl_ctx_init(&acpi_video_sysctl_ctx);
  176                 STAILQ_INIT(&lcd_units);
  177                 STAILQ_INIT(&crt_units);
  178                 STAILQ_INIT(&tv_units);
  179                 STAILQ_INIT(&other_units);
  180                 break;
  181         case MOD_UNLOAD:
  182                 sysctl_ctx_free(&acpi_video_sysctl_ctx);
  183                 acpi_video_sysctl_tree = NULL;
  184                 break;
  185         default:
  186                 err = EINVAL;
  187         }
  188 
  189         return (err);
  190 }
  191 
  192 static int
  193 acpi_video_probe(device_t dev)
  194 {
  195         ACPI_HANDLE devh, h;
  196         ACPI_OBJECT_TYPE t_dos;
  197 
  198         devh = acpi_get_handle(dev);
  199         if (acpi_disabled("video") ||
  200             ACPI_FAILURE(AcpiGetHandle(devh, "_DOD", &h)) ||
  201             ACPI_FAILURE(AcpiGetHandle(devh, "_DOS", &h)) ||
  202             ACPI_FAILURE(AcpiGetType(h, &t_dos)) ||
  203             t_dos != ACPI_TYPE_METHOD)
  204                 return (ENXIO);
  205 
  206         device_set_desc(dev, "ACPI video extension");
  207         return (0);
  208 }
  209 
  210 static int
  211 acpi_video_attach(device_t dev)
  212 {
  213         struct acpi_softc *acpi_sc;
  214         struct acpi_video_softc *sc;
  215 
  216         sc = device_get_softc(dev);
  217 
  218         acpi_sc = devclass_get_softc(devclass_find("acpi"), 0);
  219         if (acpi_sc == NULL)
  220                 return (ENXIO);
  221         if (acpi_video_sysctl_tree == NULL) {
  222                 acpi_video_sysctl_tree = SYSCTL_ADD_NODE(&acpi_video_sysctl_ctx,
  223                                     SYSCTL_CHILDREN(acpi_sc->acpi_sysctl_tree),
  224                                     OID_AUTO, "video", CTLFLAG_RD, 0,
  225                                     "video extension control");
  226         }
  227 
  228         sc->device = dev;
  229         sc->handle = acpi_get_handle(dev);
  230         STAILQ_INIT(&sc->vid_outputs);
  231 
  232         AcpiInstallNotifyHandler(sc->handle, ACPI_DEVICE_NOTIFY,
  233                                  acpi_video_notify_handler, sc);
  234         sc->vid_pwr_evh = EVENTHANDLER_REGISTER(power_profile_change,
  235                                  acpi_video_power_profile, sc, 0);
  236 
  237         ACPI_SERIAL_BEGIN(video);
  238         acpi_video_bind_outputs(sc);
  239         ACPI_SERIAL_END(video);
  240 
  241         /*
  242          * Notify the BIOS that we want to switch both active outputs and
  243          * brightness levels.
  244          */
  245         vid_set_switch_policy(sc->handle, DOS_SWITCH_BY_OSPM |
  246             DOS_BRIGHTNESS_BY_BIOS);
  247 
  248         acpi_video_power_profile(sc);
  249 
  250         return (0);
  251 }
  252 
  253 static int
  254 acpi_video_detach(device_t dev)
  255 {
  256         struct acpi_video_softc *sc;
  257         struct acpi_video_output *vo, *vn;
  258 
  259         sc = device_get_softc(dev);
  260 
  261         vid_set_switch_policy(sc->handle, DOS_SWITCH_BY_BIOS);
  262         EVENTHANDLER_DEREGISTER(power_profile_change, sc->vid_pwr_evh);
  263         AcpiRemoveNotifyHandler(sc->handle, ACPI_DEVICE_NOTIFY,
  264                                 acpi_video_notify_handler);
  265 
  266         ACPI_SERIAL_BEGIN(video);
  267         for (vo = STAILQ_FIRST(&sc->vid_outputs); vo != NULL; vo = vn) {
  268                 vn = STAILQ_NEXT(vo, vo_next);
  269                 acpi_video_vo_destroy(vo);
  270         }
  271         ACPI_SERIAL_END(video);
  272 
  273         return (0);
  274 }
  275 
  276 static int
  277 acpi_video_shutdown(device_t dev)
  278 {
  279         struct acpi_video_softc *sc;
  280 
  281         sc = device_get_softc(dev);
  282         vid_set_switch_policy(sc->handle, DOS_SWITCH_BY_BIOS);
  283 
  284         return (0);
  285 }
  286 
  287 static void
  288 acpi_video_notify_handler(ACPI_HANDLE handle, UINT32 notify, void *context)
  289 {
  290         struct acpi_video_softc *sc;
  291         struct acpi_video_output *vo, *vo_tmp;
  292         ACPI_HANDLE lasthand;
  293         UINT32 dcs, dss, dss_p;
  294 
  295         sc = (struct acpi_video_softc *)context;
  296 
  297         switch (notify) {
  298         case VID_NOTIFY_SWITCHED:
  299                 dss_p = 0;
  300                 lasthand = NULL;
  301                 ACPI_SERIAL_BEGIN(video);
  302                 STAILQ_FOREACH(vo, &sc->vid_outputs, vo_next) {
  303                         dss = vo_get_graphics_state(vo->handle);
  304                         dcs = vo_get_device_status(vo->handle);
  305                         if (!(dcs & DCS_READY))
  306                                 dss = DSS_INACTIVE;
  307                         if (((dcs & DCS_ACTIVE) && dss == DSS_INACTIVE) ||
  308                             (!(dcs & DCS_ACTIVE) && dss == DSS_ACTIVE)) {
  309                                 if (lasthand != NULL)
  310                                         vo_set_device_state(lasthand, dss_p);
  311                                 dss_p = dss;
  312                                 lasthand = vo->handle;
  313                         }
  314                 }
  315                 if (lasthand != NULL)
  316                         vo_set_device_state(lasthand, dss_p|DSS_COMMIT);
  317                 ACPI_SERIAL_END(video);
  318                 break;
  319         case VID_NOTIFY_REPROBE:
  320                 ACPI_SERIAL_BEGIN(video);
  321                 STAILQ_FOREACH(vo, &sc->vid_outputs, vo_next)
  322                         vo->handle = NULL;
  323                 acpi_video_bind_outputs(sc);
  324                 STAILQ_FOREACH_SAFE(vo, &sc->vid_outputs, vo_next, vo_tmp) {
  325                         if (vo->handle == NULL) {
  326                                 STAILQ_REMOVE(&sc->vid_outputs, vo,
  327                                     acpi_video_output, vo_next);
  328                                 acpi_video_vo_destroy(vo);
  329                         }
  330                 }
  331                 ACPI_SERIAL_END(video);
  332                 break;
  333         default:
  334                 device_printf(sc->device, "unknown notify event 0x%x\n",
  335                     notify);
  336         }
  337 }
  338 
  339 static void
  340 acpi_video_power_profile(void *context)
  341 {
  342         int state;
  343         struct acpi_video_softc *sc;
  344         struct acpi_video_output *vo;
  345 
  346         sc = context;
  347         state = power_profile_get_state();
  348         if (state != POWER_PROFILE_PERFORMANCE &&
  349             state != POWER_PROFILE_ECONOMY)
  350                 return;
  351 
  352         ACPI_SERIAL_BEGIN(video);
  353         STAILQ_FOREACH(vo, &sc->vid_outputs, vo_next) {
  354                 if (vo->vo_levels != NULL && vo->vo_brightness == -1)
  355                         vo_set_brightness(vo->handle,
  356                             state == POWER_PROFILE_ECONOMY ?
  357                             vo->vo_economy : vo->vo_fullpower);
  358         }
  359         ACPI_SERIAL_END(video);
  360 }
  361 
  362 static void
  363 acpi_video_bind_outputs_subr(ACPI_HANDLE handle, UINT32 adr, void *context)
  364 {
  365         struct acpi_video_softc *sc;
  366         struct acpi_video_output *vo;
  367 
  368         ACPI_SERIAL_ASSERT(video);
  369         sc = context;
  370 
  371         STAILQ_FOREACH(vo, &sc->vid_outputs, vo_next) {
  372                 if (vo->adr == adr) {
  373                         acpi_video_vo_bind(vo, handle);
  374                         return;
  375                 }
  376         }
  377         vo = acpi_video_vo_init(adr);
  378         if (vo != NULL) {
  379                 acpi_video_vo_bind(vo, handle);
  380                 STAILQ_INSERT_TAIL(&sc->vid_outputs, vo, vo_next);
  381         }
  382 }
  383 
  384 static void
  385 acpi_video_bind_outputs(struct acpi_video_softc *sc)
  386 {
  387 
  388         ACPI_SERIAL_ASSERT(video);
  389         vid_enum_outputs(sc->handle, acpi_video_bind_outputs_subr, sc);
  390 }
  391 
  392 static struct acpi_video_output *
  393 acpi_video_vo_init(UINT32 adr)
  394 {
  395         struct acpi_video_output *vn, *vo, *vp;
  396         int n, x;
  397         char name[8], env[32];
  398         const char *type, *desc;
  399         struct acpi_video_output_queue *voqh;
  400 
  401         ACPI_SERIAL_ASSERT(video);
  402         switch (adr & DOD_DEVID_MASK) {
  403         case DOD_DEVID_MONITOR:
  404                 desc = "CRT monitor";
  405                 type = "crt";
  406                 voqh = &crt_units;
  407                 break;
  408         case DOD_DEVID_PANEL:
  409                 desc = "LCD panel";
  410                 type = "lcd";
  411                 voqh = &lcd_units;
  412                 break;
  413         case DOD_DEVID_TV:
  414                 desc = "TV";
  415                 type = "tv";
  416                 voqh = &tv_units;
  417                 break;
  418         default:
  419                 desc = "unknown output";
  420                 type = "out";
  421                 voqh = &other_units;
  422         }
  423 
  424         n = 0;
  425         vn = vp = NULL;
  426         STAILQ_FOREACH(vn, voqh, vo_unit.next) {
  427                 if (vn->vo_unit.num != n)
  428                         break;
  429                 vp = vn;
  430                 n++;
  431         }
  432 
  433         snprintf(name, sizeof(name), "%s%d", type, n);
  434 
  435         vo = malloc(sizeof(*vo), M_ACPIVIDEO, M_NOWAIT);
  436         if (vo != NULL) {
  437                 vo->handle = NULL;
  438                 vo->adr = adr;
  439                 vo->vo_unit.num = n;
  440                 vo->vo_brightness = -1;
  441                 vo->vo_fullpower = -1;  /* TODO: override with tunables */
  442                 vo->vo_economy = -1;
  443                 vo->vo_numlevels = 0;
  444                 vo->vo_levels = NULL;
  445                 snprintf(env, sizeof(env), "hw.acpi.video.%s.fullpower", name);
  446                 if (getenv_int(env, &x))
  447                         vo->vo_fullpower = x;
  448                 snprintf(env, sizeof(env), "hw.acpi.video.%s.economy", name);
  449                 if (getenv_int(env, &x))
  450                         vo->vo_economy = x;
  451 
  452                 sysctl_ctx_init(&vo->vo_sysctl_ctx);
  453                 if (vp != NULL)
  454                         STAILQ_INSERT_AFTER(voqh, vp, vo, vo_unit.next);
  455                 else
  456                         STAILQ_INSERT_TAIL(voqh, vo, vo_unit.next);
  457                 if (acpi_video_sysctl_tree != NULL)
  458                         vo->vo_sysctl_tree =
  459                             SYSCTL_ADD_NODE(&vo->vo_sysctl_ctx,
  460                                 SYSCTL_CHILDREN(acpi_video_sysctl_tree),
  461                                 OID_AUTO, name, CTLFLAG_RD, 0, desc);
  462                 if (vo->vo_sysctl_tree != NULL) {
  463                         SYSCTL_ADD_PROC(&vo->vo_sysctl_ctx,
  464                             SYSCTL_CHILDREN(vo->vo_sysctl_tree),
  465                             OID_AUTO, "active",
  466                             CTLTYPE_INT|CTLFLAG_RW, vo, 0,
  467                             acpi_video_vo_active_sysctl, "I",
  468                             "current activity of this device");
  469                         SYSCTL_ADD_PROC(&vo->vo_sysctl_ctx,
  470                             SYSCTL_CHILDREN(vo->vo_sysctl_tree),
  471                             OID_AUTO, "brightness",
  472                             CTLTYPE_INT|CTLFLAG_RW, vo, 0,
  473                             acpi_video_vo_bright_sysctl, "I",
  474                             "current brightness level");
  475                         SYSCTL_ADD_PROC(&vo->vo_sysctl_ctx,
  476                             SYSCTL_CHILDREN(vo->vo_sysctl_tree),
  477                             OID_AUTO, "fullpower",
  478                             CTLTYPE_INT|CTLFLAG_RW, vo,
  479                             POWER_PROFILE_PERFORMANCE,
  480                             acpi_video_vo_presets_sysctl, "I",
  481                             "preset level for full power mode");
  482                         SYSCTL_ADD_PROC(&vo->vo_sysctl_ctx,
  483                             SYSCTL_CHILDREN(vo->vo_sysctl_tree),
  484                             OID_AUTO, "economy",
  485                             CTLTYPE_INT|CTLFLAG_RW, vo,
  486                             POWER_PROFILE_ECONOMY,
  487                             acpi_video_vo_presets_sysctl, "I",
  488                             "preset level for economy mode");
  489                         SYSCTL_ADD_PROC(&vo->vo_sysctl_ctx,
  490                             SYSCTL_CHILDREN(vo->vo_sysctl_tree),
  491                             OID_AUTO, "levels",
  492                             CTLTYPE_OPAQUE|CTLFLAG_RD, vo, 0,
  493                             acpi_video_vo_levels_sysctl, "I",
  494                             "supported brightness levels");
  495                 } else
  496                         printf("%s: sysctl node creation failed\n", type);
  497         } else
  498                 printf("%s: softc allocation failed\n", type);
  499 
  500         if (bootverbose) {
  501                 printf("found %s(%x)", desc, adr & DOD_DEVID_MASK);
  502                 if (adr & DOD_BIOS)
  503                         printf(", detectable by BIOS");
  504                 if (adr & DOD_NONVGA)
  505                         printf(" (not a VGA output)");
  506                 printf(", head #%d\n",
  507                    (adr & DOD_HEAD_ID_MASK) >> DOD_HEAD_ID_SHIFT);
  508         }
  509         return (vo);
  510 }
  511 
  512 static void
  513 acpi_video_vo_bind(struct acpi_video_output *vo, ACPI_HANDLE handle)
  514 {
  515 
  516         ACPI_SERIAL_ASSERT(video);
  517         if (vo->vo_levels != NULL)
  518                 AcpiOsFree(vo->vo_levels);
  519         vo->handle = handle;
  520         vo->vo_numlevels = vo_get_brightness_levels(handle, &vo->vo_levels);
  521         if (vo->vo_numlevels >= 2) {
  522                 if (vo->vo_fullpower == -1
  523                     || acpi_video_vo_check_level(vo, vo->vo_fullpower) != 0)
  524                         /* XXX - can't deal with rebinding... */
  525                         vo->vo_fullpower = vo->vo_levels[BCL_FULLPOWER];
  526                 if (vo->vo_economy == -1
  527                     || acpi_video_vo_check_level(vo, vo->vo_economy) != 0)
  528                         /* XXX - see above. */
  529                         vo->vo_economy = vo->vo_levels[BCL_ECONOMY];
  530         }
  531 }
  532 
  533 static void
  534 acpi_video_vo_destroy(struct acpi_video_output *vo)
  535 {
  536         struct acpi_video_output_queue *voqh;
  537 
  538         ACPI_SERIAL_ASSERT(video);
  539         if (vo->vo_sysctl_tree != NULL) {
  540                 vo->vo_sysctl_tree = NULL;
  541                 sysctl_ctx_free(&vo->vo_sysctl_ctx);
  542         }
  543         if (vo->vo_levels != NULL)
  544                 AcpiOsFree(vo->vo_levels);
  545 
  546         switch (vo->adr & DOD_DEVID_MASK) {
  547         case DOD_DEVID_MONITOR:
  548                 voqh = &crt_units;
  549                 break;
  550         case DOD_DEVID_PANEL:
  551                 voqh = &lcd_units;
  552                 break;
  553         case DOD_DEVID_TV:
  554                 voqh = &tv_units;
  555                 break;
  556         default:
  557                 voqh = &other_units;
  558         }
  559         STAILQ_REMOVE(voqh, vo, acpi_video_output, vo_unit.next);
  560         free(vo, M_ACPIVIDEO);
  561 }
  562 
  563 static int
  564 acpi_video_vo_check_level(struct acpi_video_output *vo, int level)
  565 {
  566         int i;
  567 
  568         ACPI_SERIAL_ASSERT(video);
  569         if (vo->vo_levels == NULL)
  570                 return (ENODEV);
  571         for (i = 0; i < vo->vo_numlevels; i++)
  572                 if (vo->vo_levels[i] == level)
  573                         return (0);
  574         return (EINVAL);
  575 }
  576 
  577 /* ARGSUSED */
  578 static int
  579 acpi_video_vo_active_sysctl(SYSCTL_HANDLER_ARGS)
  580 {
  581         struct acpi_video_output *vo;
  582         int state, err;
  583 
  584         vo = (struct acpi_video_output *)arg1;
  585         if (vo->handle == NULL)
  586                 return (ENXIO);
  587         ACPI_SERIAL_BEGIN(video);
  588         state = (vo_get_device_status(vo->handle) & DCS_ACTIVE) ? 1 : 0;
  589         err = sysctl_handle_int(oidp, &state, 0, req);
  590         if (err != 0 || req->newptr == NULL)
  591                 goto out;
  592         vo_set_device_state(vo->handle,
  593             DSS_COMMIT | (state ? DSS_ACTIVE : DSS_INACTIVE));
  594 out:
  595         ACPI_SERIAL_END(video);
  596         return (err);
  597 }
  598 
  599 /* ARGSUSED */
  600 static int
  601 acpi_video_vo_bright_sysctl(SYSCTL_HANDLER_ARGS)
  602 {
  603         struct acpi_video_output *vo;
  604         int level, preset, err;
  605 
  606         vo = (struct acpi_video_output *)arg1;
  607         ACPI_SERIAL_BEGIN(video);
  608         if (vo->handle == NULL) {
  609                 err = ENXIO;
  610                 goto out;
  611         }
  612         if (vo->vo_levels == NULL) {
  613                 err = ENODEV;
  614                 goto out;
  615         }
  616 
  617         preset = (power_profile_get_state() == POWER_PROFILE_ECONOMY) ?
  618                   vo->vo_economy : vo->vo_fullpower;
  619         level = vo->vo_brightness;
  620         if (level == -1)
  621                 level = preset;
  622 
  623         err = sysctl_handle_int(oidp, &level, 0, req);
  624         if (err != 0 || req->newptr == NULL)
  625                 goto out;
  626         if (level < -1 || level > 100) {
  627                 err = EINVAL;
  628                 goto out;
  629         }
  630 
  631         if (level != -1 && (err = acpi_video_vo_check_level(vo, level)))
  632                 goto out;
  633         vo->vo_brightness = level;
  634         vo_set_brightness(vo->handle, (level == -1) ? preset : level);
  635 
  636 out:
  637         ACPI_SERIAL_END(video);
  638         return (err);
  639 }
  640 
  641 static int
  642 acpi_video_vo_presets_sysctl(SYSCTL_HANDLER_ARGS)
  643 {
  644         struct acpi_video_output *vo;
  645         int i, level, *preset, err;
  646 
  647         err = 0;
  648         vo = (struct acpi_video_output *)arg1;
  649         ACPI_SERIAL_BEGIN(video);
  650         if (vo->handle == NULL) {
  651                 err = ENXIO;
  652                 goto out;
  653         }
  654         if (vo->vo_levels == NULL) {
  655                 err = ENODEV;
  656                 goto out;
  657         }
  658         preset = (arg2 == POWER_PROFILE_ECONOMY) ?
  659                   &vo->vo_economy : &vo->vo_fullpower;
  660         level = *preset;
  661         err = sysctl_handle_int(oidp, &level, 0, req);
  662         if (err != 0 || req->newptr == NULL)
  663                 goto out;
  664         if (level < -1 || level > 100) {
  665                 err = EINVAL;
  666                 goto out;
  667         }
  668         if (level == -1) {
  669                 i = (arg2 == POWER_PROFILE_ECONOMY) ?
  670                     BCL_ECONOMY : BCL_FULLPOWER;
  671                 level = vo->vo_levels[i];
  672         } else if ((err = acpi_video_vo_check_level(vo, level)) != 0)
  673                 goto out;
  674 
  675         if (vo->vo_brightness == -1 && (power_profile_get_state() == arg2))
  676                 vo_set_brightness(vo->handle, level);
  677         *preset = level;
  678 
  679 out:
  680         ACPI_SERIAL_END(video);
  681         return (err);
  682 }
  683 
  684 /* ARGSUSED */
  685 static int
  686 acpi_video_vo_levels_sysctl(SYSCTL_HANDLER_ARGS)
  687 {
  688         struct acpi_video_output *vo;
  689         int err;
  690 
  691         vo = (struct acpi_video_output *)arg1;
  692         ACPI_SERIAL_BEGIN(video);
  693         if (vo->vo_levels == NULL) {
  694                 err = ENODEV;
  695                 goto out;
  696         }
  697         if (req->newptr != NULL) {
  698                 err = EPERM;
  699                 goto out;
  700         }
  701         err = sysctl_handle_opaque(oidp, vo->vo_levels,
  702             vo->vo_numlevels * sizeof(*vo->vo_levels), req);
  703 
  704 out:
  705         ACPI_SERIAL_END(video);
  706         return (err);
  707 }
  708 
  709 static void
  710 vid_set_switch_policy(ACPI_HANDLE handle, UINT32 policy)
  711 {
  712         ACPI_STATUS status;
  713 
  714         status = acpi_SetInteger(handle, "_DOS", policy);
  715         if (ACPI_FAILURE(status))
  716                 printf("can't evaluate %s._DOS - %s\n",
  717                        acpi_name(handle), AcpiFormatException(status));
  718 }
  719 
  720 struct enum_callback_arg {
  721         void (*callback)(ACPI_HANDLE, UINT32, void *);
  722         void *context;
  723         ACPI_OBJECT *dod_pkg;
  724         int count;
  725 };
  726 
  727 static ACPI_STATUS
  728 vid_enum_outputs_subr(ACPI_HANDLE handle, UINT32 level __unused,
  729                       void *context, void **retp __unused)
  730 {
  731         ACPI_STATUS status;
  732         UINT32 adr, val;
  733         struct enum_callback_arg *argset;
  734         size_t i;
  735 
  736         ACPI_SERIAL_ASSERT(video);
  737         argset = context;
  738         status = acpi_GetInteger(handle, "_ADR", &adr);
  739         if (ACPI_FAILURE(status))
  740                 return (AE_OK);
  741 
  742         for (i = 0; i < argset->dod_pkg->Package.Count; i++) {
  743                 if (acpi_PkgInt32(argset->dod_pkg, i, &val) == 0 &&
  744                     (val & DOD_DEVID_MASK) == adr) {
  745                         argset->callback(handle, val, argset->context);
  746                         argset->count++;
  747                 }
  748         }
  749 
  750         return (AE_OK);
  751 }
  752 
  753 static int
  754 vid_enum_outputs(ACPI_HANDLE handle,
  755                  void (*callback)(ACPI_HANDLE, UINT32, void *), void *context)
  756 {
  757         ACPI_STATUS status;
  758         ACPI_BUFFER dod_buf;
  759         ACPI_OBJECT *res;
  760         struct enum_callback_arg argset;
  761 
  762         ACPI_SERIAL_ASSERT(video);
  763         dod_buf.Length = ACPI_ALLOCATE_BUFFER;
  764         dod_buf.Pointer = NULL;
  765         status = AcpiEvaluateObject(handle, "_DOD", NULL, &dod_buf);
  766         if (ACPI_FAILURE(status)) {
  767                 if (status != AE_NOT_FOUND)
  768                         printf("can't evaluate %s._DOD - %s\n",
  769                                acpi_name(handle), AcpiFormatException(status));
  770                 argset.count = -1;
  771                 goto out;
  772         }
  773         res = (ACPI_OBJECT *)dod_buf.Pointer;
  774         if (!ACPI_PKG_VALID(res, 1)) {
  775                 printf("evaluation of %s._DOD makes no sense\n",
  776                        acpi_name(handle));
  777                 argset.count = -1;
  778                 goto out;
  779         }
  780         if (callback == NULL) {
  781                 argset.count = res->Package.Count;
  782                 goto out;
  783         }
  784         argset.callback = callback;
  785         argset.context  = context;
  786         argset.dod_pkg  = res;
  787         argset.count    = 0;
  788         status = AcpiWalkNamespace(ACPI_TYPE_DEVICE, handle, 1,
  789             vid_enum_outputs_subr, &argset, NULL);
  790         if (ACPI_FAILURE(status))
  791                 printf("failed walking down %s - %s\n",
  792                        acpi_name(handle), AcpiFormatException(status));
  793 out:
  794         if (dod_buf.Pointer != NULL)
  795                 AcpiOsFree(dod_buf.Pointer);
  796         return (argset.count);
  797 }
  798 
  799 static int
  800 vo_get_brightness_levels(ACPI_HANDLE handle, int **levelp)
  801 {
  802         ACPI_STATUS status;
  803         ACPI_BUFFER bcl_buf;
  804         ACPI_OBJECT *res;
  805         int num, i, n, *levels;
  806 
  807         num = 0;
  808         bcl_buf.Length = ACPI_ALLOCATE_BUFFER;
  809         bcl_buf.Pointer = NULL;
  810         status = AcpiEvaluateObject(handle, "_BCL", NULL, &bcl_buf);
  811         if (ACPI_FAILURE(status)) {
  812                 if (status != AE_NOT_FOUND)
  813                         printf("can't evaluate %s._BCL - %s\n",
  814                                acpi_name(handle), AcpiFormatException(status));
  815                 num = -1;
  816                 goto out;
  817         }
  818         res = (ACPI_OBJECT *)bcl_buf.Pointer;
  819         if (!ACPI_PKG_VALID(res, 2)) {
  820                 printf("evaluation of %s._BCL makes no sense\n",
  821                        acpi_name(handle));
  822                 num = -1;
  823                 goto out;
  824         }
  825         num = res->Package.Count;
  826         if (levelp == NULL)
  827                 goto out;
  828         levels = AcpiOsAllocate(num * sizeof(*levels));
  829         if (levels == NULL) {
  830                 num = -1;
  831                 goto out;
  832         }
  833         for (i = 0, n = 0; i < num; i++)
  834                 if (acpi_PkgInt32(res, i, &levels[n]) == 0)
  835                         n++;
  836         if (n < 2) {
  837                 num = -1;
  838                 AcpiOsFree(levels);
  839         } else {
  840                 num = n;
  841                 *levelp = levels;
  842         }
  843 out:
  844         if (bcl_buf.Pointer != NULL)
  845                 AcpiOsFree(bcl_buf.Pointer);
  846 
  847         return (num);
  848 }
  849 
  850 static void
  851 vo_set_brightness(ACPI_HANDLE handle, int level)
  852 {
  853         ACPI_STATUS status;
  854 
  855         status = acpi_SetInteger(handle, "_BCM", level);
  856         if (ACPI_FAILURE(status))
  857                 printf("can't evaluate %s._BCM - %s\n",
  858                        acpi_name(handle), AcpiFormatException(status));
  859 }
  860 
  861 static UINT32
  862 vo_get_device_status(ACPI_HANDLE handle)
  863 {
  864         UINT32 dcs;
  865         ACPI_STATUS status;
  866 
  867         dcs = 0;
  868         status = acpi_GetInteger(handle, "_DCS", &dcs);
  869         if (ACPI_FAILURE(status))
  870                 printf("can't evaluate %s._DCS - %s\n",
  871                        acpi_name(handle), AcpiFormatException(status));
  872 
  873         return (dcs);
  874 }
  875 
  876 static UINT32
  877 vo_get_graphics_state(ACPI_HANDLE handle)
  878 {
  879         UINT32 dgs;
  880         ACPI_STATUS status;
  881 
  882         dgs = 0;
  883         status = acpi_GetInteger(handle, "_DGS", &dgs);
  884         if (ACPI_FAILURE(status))
  885                 printf("can't evaluate %s._DGS - %s\n",
  886                        acpi_name(handle), AcpiFormatException(status));
  887 
  888         return (dgs);
  889 }
  890 
  891 static void
  892 vo_set_device_state(ACPI_HANDLE handle, UINT32 state)
  893 {
  894         ACPI_STATUS status;
  895 
  896         status = acpi_SetInteger(handle, "_DSS", state);
  897         if (ACPI_FAILURE(status))
  898                 printf("can't evaluate %s._DSS - %s\n",
  899                        acpi_name(handle), AcpiFormatException(status));
  900 }

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