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/9.0/sys/dev/acpica/acpi_video.c 217566 2011-01-19 00:57:58Z mdf $");
   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 <contrib/dev/acpica/include/acpi.h>
   42 
   43 #include <dev/acpica/acpivar.h>
   44 
   45 /* ACPI video extension driver. */
   46 struct acpi_video_output {
   47         ACPI_HANDLE     handle;
   48         UINT32          adr;
   49         STAILQ_ENTRY(acpi_video_output) vo_next;
   50         struct {
   51                 int     num;
   52                 STAILQ_ENTRY(acpi_video_output) next;
   53         } vo_unit;
   54         int             vo_brightness;
   55         int             vo_fullpower;
   56         int             vo_economy;
   57         int             vo_numlevels;
   58         int             *vo_levels;
   59         struct sysctl_ctx_list vo_sysctl_ctx;
   60         struct sysctl_oid *vo_sysctl_tree;
   61 };
   62 
   63 STAILQ_HEAD(acpi_video_output_queue, acpi_video_output);
   64 
   65 struct acpi_video_softc {
   66         device_t                device;
   67         ACPI_HANDLE             handle;
   68         struct acpi_video_output_queue vid_outputs;
   69         eventhandler_tag        vid_pwr_evh;
   70 };
   71 
   72 /* interfaces */
   73 static int      acpi_video_modevent(struct module*, int, void *);
   74 static void     acpi_video_identify(driver_t *driver, device_t parent);
   75 static int      acpi_video_probe(device_t);
   76 static int      acpi_video_attach(device_t);
   77 static int      acpi_video_detach(device_t);
   78 static int      acpi_video_shutdown(device_t);
   79 static void     acpi_video_notify_handler(ACPI_HANDLE, UINT32, void *);
   80 static void     acpi_video_power_profile(void *);
   81 static void     acpi_video_bind_outputs(struct acpi_video_softc *);
   82 static struct acpi_video_output *acpi_video_vo_init(UINT32);
   83 static void     acpi_video_vo_bind(struct acpi_video_output *, ACPI_HANDLE);
   84 static void     acpi_video_vo_destroy(struct acpi_video_output *);
   85 static int      acpi_video_vo_check_level(struct acpi_video_output *, int);
   86 static void     acpi_video_vo_notify_handler(ACPI_HANDLE, UINT32, void *);
   87 static int      acpi_video_vo_active_sysctl(SYSCTL_HANDLER_ARGS);
   88 static int      acpi_video_vo_bright_sysctl(SYSCTL_HANDLER_ARGS);
   89 static int      acpi_video_vo_presets_sysctl(SYSCTL_HANDLER_ARGS);
   90 static int      acpi_video_vo_levels_sysctl(SYSCTL_HANDLER_ARGS);
   91 
   92 /* operations */
   93 static void     vid_set_switch_policy(ACPI_HANDLE, UINT32);
   94 static int      vid_enum_outputs(ACPI_HANDLE,
   95                     void(*)(ACPI_HANDLE, UINT32, void *), void *);
   96 static int      vo_get_brightness_levels(ACPI_HANDLE, int **);
   97 static int      vo_get_brightness(ACPI_HANDLE);
   98 static void     vo_set_brightness(ACPI_HANDLE, int);
   99 static UINT32   vo_get_device_status(ACPI_HANDLE);
  100 static UINT32   vo_get_graphics_state(ACPI_HANDLE);
  101 static void     vo_set_device_state(ACPI_HANDLE, UINT32);
  102 
  103 /* events */
  104 #define VID_NOTIFY_SWITCHED     0x80
  105 #define VID_NOTIFY_REPROBE      0x81
  106 #define VID_NOTIFY_CYCLE_BRN    0x85
  107 #define VID_NOTIFY_INC_BRN      0x86
  108 #define VID_NOTIFY_DEC_BRN      0x87
  109 #define VID_NOTIFY_ZERO_BRN     0x88
  110 
  111 /* _DOS (Enable/Disable Output Switching) argument bits */
  112 #define DOS_SWITCH_MASK         3
  113 #define DOS_SWITCH_BY_OSPM      0
  114 #define DOS_SWITCH_BY_BIOS      1
  115 #define DOS_SWITCH_LOCKED       2
  116 #define DOS_BRIGHTNESS_BY_OSPM  (1 << 2)
  117 
  118 /* _DOD and subdev's _ADR */
  119 #define DOD_DEVID_MASK          0x0f00
  120 #define DOD_DEVID_MASK_FULL     0xffff
  121 #define DOD_DEVID_MASK_DISPIDX  0x000f
  122 #define DOD_DEVID_MASK_DISPPORT 0x00f0
  123 #define DOD_DEVID_MONITOR       0x0100
  124 #define DOD_DEVID_LCD           0x0110
  125 #define DOD_DEVID_TV            0x0200
  126 #define DOD_DEVID_EXT           0x0300
  127 #define DOD_DEVID_INTDFP        0x0400
  128 #define DOD_BIOS                (1 << 16)
  129 #define DOD_NONVGA              (1 << 17)
  130 #define DOD_HEAD_ID_SHIFT       18
  131 #define DOD_HEAD_ID_BITS        3
  132 #define DOD_HEAD_ID_MASK \
  133                 (((1 << DOD_HEAD_ID_BITS) - 1) << DOD_HEAD_ID_SHIFT)
  134 #define DOD_DEVID_SCHEME_STD    (1 << 31)
  135 
  136 /* _BCL related constants */
  137 #define BCL_FULLPOWER           0
  138 #define BCL_ECONOMY             1
  139 
  140 /* _DCS (Device Currrent Status) value bits and masks. */
  141 #define DCS_EXISTS              (1 << 0)
  142 #define DCS_ACTIVE              (1 << 1)
  143 #define DCS_READY               (1 << 2)
  144 #define DCS_FUNCTIONAL          (1 << 3)
  145 #define DCS_ATTACHED            (1 << 4)
  146 
  147 /* _DSS (Device Set Status) argument bits and masks. */
  148 #define DSS_INACTIVE            0
  149 #define DSS_ACTIVE              (1 << 0)
  150 #define DSS_SETNEXT             (1 << 30)
  151 #define DSS_COMMIT              (1 << 31)
  152 
  153 static device_method_t acpi_video_methods[] = {
  154         DEVMETHOD(device_identify, acpi_video_identify),
  155         DEVMETHOD(device_probe, acpi_video_probe),
  156         DEVMETHOD(device_attach, acpi_video_attach),
  157         DEVMETHOD(device_detach, acpi_video_detach),
  158         DEVMETHOD(device_shutdown, acpi_video_shutdown),
  159         { 0, 0 }
  160 };
  161 
  162 static driver_t acpi_video_driver = {
  163         "acpi_video",
  164         acpi_video_methods,
  165         sizeof(struct acpi_video_softc),
  166 };
  167 
  168 static devclass_t acpi_video_devclass;
  169 
  170 DRIVER_MODULE(acpi_video, vgapci, acpi_video_driver, acpi_video_devclass,
  171               acpi_video_modevent, NULL);
  172 MODULE_DEPEND(acpi_video, acpi, 1, 1, 1);
  173 
  174 static struct sysctl_ctx_list   acpi_video_sysctl_ctx;
  175 static struct sysctl_oid        *acpi_video_sysctl_tree;
  176 static struct acpi_video_output_queue crt_units, tv_units,
  177     ext_units, lcd_units, other_units;
  178 
  179 /*
  180  * The 'video' lock protects the hierarchy of video output devices
  181  * (the video "bus").  The 'video_output' lock protects per-output
  182  * data is equivalent to a softc lock for each video output.
  183  */
  184 ACPI_SERIAL_DECL(video, "ACPI video");
  185 ACPI_SERIAL_DECL(video_output, "ACPI video output");
  186 MALLOC_DEFINE(M_ACPIVIDEO, "acpivideo", "ACPI video extension");
  187 
  188 static int
  189 acpi_video_modevent(struct module *mod __unused, int evt, void *cookie __unused)
  190 {
  191         int err;
  192 
  193         err = 0;
  194         switch (evt) {
  195         case MOD_LOAD:
  196                 sysctl_ctx_init(&acpi_video_sysctl_ctx);
  197                 STAILQ_INIT(&crt_units);
  198                 STAILQ_INIT(&tv_units);
  199                 STAILQ_INIT(&ext_units);
  200                 STAILQ_INIT(&lcd_units);
  201                 STAILQ_INIT(&other_units);
  202                 break;
  203         case MOD_UNLOAD:
  204                 sysctl_ctx_free(&acpi_video_sysctl_ctx);
  205                 acpi_video_sysctl_tree = NULL;
  206                 break;
  207         default:
  208                 err = EINVAL;
  209         }
  210 
  211         return (err);
  212 }
  213 
  214 static void
  215 acpi_video_identify(driver_t *driver, device_t parent)
  216 {
  217 
  218         if (device_find_child(parent, "acpi_video", -1) == NULL)
  219                 device_add_child(parent, "acpi_video", -1);
  220 }
  221 
  222 static int
  223 acpi_video_probe(device_t dev)
  224 {
  225         ACPI_HANDLE devh, h;
  226         ACPI_OBJECT_TYPE t_dos;
  227 
  228         devh = acpi_get_handle(dev);
  229         if (acpi_disabled("video") ||
  230             ACPI_FAILURE(AcpiGetHandle(devh, "_DOD", &h)) ||
  231             ACPI_FAILURE(AcpiGetHandle(devh, "_DOS", &h)) ||
  232             ACPI_FAILURE(AcpiGetType(h, &t_dos)) ||
  233             t_dos != ACPI_TYPE_METHOD)
  234                 return (ENXIO);
  235 
  236         device_set_desc(dev, "ACPI video extension");
  237         return (0);
  238 }
  239 
  240 static int
  241 acpi_video_attach(device_t dev)
  242 {
  243         struct acpi_softc *acpi_sc;
  244         struct acpi_video_softc *sc;
  245 
  246         sc = device_get_softc(dev);
  247 
  248         acpi_sc = devclass_get_softc(devclass_find("acpi"), 0);
  249         if (acpi_sc == NULL)
  250                 return (ENXIO);
  251         ACPI_SERIAL_BEGIN(video);
  252         if (acpi_video_sysctl_tree == NULL) {
  253                 acpi_video_sysctl_tree = SYSCTL_ADD_NODE(&acpi_video_sysctl_ctx,
  254                                     SYSCTL_CHILDREN(acpi_sc->acpi_sysctl_tree),
  255                                     OID_AUTO, "video", CTLFLAG_RD, 0,
  256                                     "video extension control");
  257         }
  258         ACPI_SERIAL_END(video);
  259 
  260         sc->device = dev;
  261         sc->handle = acpi_get_handle(dev);
  262         STAILQ_INIT(&sc->vid_outputs);
  263 
  264         AcpiInstallNotifyHandler(sc->handle, ACPI_DEVICE_NOTIFY,
  265                                  acpi_video_notify_handler, sc);
  266         sc->vid_pwr_evh = EVENTHANDLER_REGISTER(power_profile_change,
  267                                  acpi_video_power_profile, sc, 0);
  268 
  269         ACPI_SERIAL_BEGIN(video);
  270         acpi_video_bind_outputs(sc);
  271         ACPI_SERIAL_END(video);
  272 
  273         /*
  274          * Notify the BIOS that we want to switch both active outputs and
  275          * brightness levels.
  276          */
  277         vid_set_switch_policy(sc->handle, DOS_SWITCH_BY_OSPM |
  278             DOS_BRIGHTNESS_BY_OSPM);
  279 
  280         acpi_video_power_profile(sc);
  281 
  282         return (0);
  283 }
  284 
  285 static int
  286 acpi_video_detach(device_t dev)
  287 {
  288         struct acpi_video_softc *sc;
  289         struct acpi_video_output *vo, *vn;
  290 
  291         sc = device_get_softc(dev);
  292 
  293         vid_set_switch_policy(sc->handle, DOS_SWITCH_BY_BIOS);
  294         EVENTHANDLER_DEREGISTER(power_profile_change, sc->vid_pwr_evh);
  295         AcpiRemoveNotifyHandler(sc->handle, ACPI_DEVICE_NOTIFY,
  296                                 acpi_video_notify_handler);
  297 
  298         ACPI_SERIAL_BEGIN(video);
  299         STAILQ_FOREACH_SAFE(vo, &sc->vid_outputs, vo_next, vn) {
  300                 acpi_video_vo_destroy(vo);
  301         }
  302         ACPI_SERIAL_END(video);
  303 
  304         return (0);
  305 }
  306 
  307 static int
  308 acpi_video_shutdown(device_t dev)
  309 {
  310         struct acpi_video_softc *sc;
  311 
  312         sc = device_get_softc(dev);
  313         vid_set_switch_policy(sc->handle, DOS_SWITCH_BY_BIOS);
  314 
  315         return (0);
  316 }
  317 
  318 static void
  319 acpi_video_notify_handler(ACPI_HANDLE handle, UINT32 notify, void *context)
  320 {
  321         struct acpi_video_softc *sc;
  322         struct acpi_video_output *vo, *vo_tmp;
  323         ACPI_HANDLE lasthand;
  324         UINT32 dcs, dss, dss_p;
  325 
  326         sc = (struct acpi_video_softc *)context;
  327 
  328         switch (notify) {
  329         case VID_NOTIFY_SWITCHED:
  330                 dss_p = 0;
  331                 lasthand = NULL;
  332                 ACPI_SERIAL_BEGIN(video);
  333                 ACPI_SERIAL_BEGIN(video_output);
  334                 STAILQ_FOREACH(vo, &sc->vid_outputs, vo_next) {
  335                         dss = vo_get_graphics_state(vo->handle);
  336                         dcs = vo_get_device_status(vo->handle);
  337                         if (!(dcs & DCS_READY))
  338                                 dss = DSS_INACTIVE;
  339                         if (((dcs & DCS_ACTIVE) && dss == DSS_INACTIVE) ||
  340                             (!(dcs & DCS_ACTIVE) && dss == DSS_ACTIVE)) {
  341                                 if (lasthand != NULL)
  342                                         vo_set_device_state(lasthand, dss_p);
  343                                 dss_p = dss;
  344                                 lasthand = vo->handle;
  345                         }
  346                 }
  347                 if (lasthand != NULL)
  348                         vo_set_device_state(lasthand, dss_p|DSS_COMMIT);
  349                 ACPI_SERIAL_END(video_output);
  350                 ACPI_SERIAL_END(video);
  351                 break;
  352         case VID_NOTIFY_REPROBE:
  353                 ACPI_SERIAL_BEGIN(video);
  354                 STAILQ_FOREACH(vo, &sc->vid_outputs, vo_next)
  355                         vo->handle = NULL;
  356                 acpi_video_bind_outputs(sc);
  357                 STAILQ_FOREACH_SAFE(vo, &sc->vid_outputs, vo_next, vo_tmp) {
  358                         if (vo->handle == NULL) {
  359                                 STAILQ_REMOVE(&sc->vid_outputs, vo,
  360                                     acpi_video_output, vo_next);
  361                                 acpi_video_vo_destroy(vo);
  362                         }
  363                 }
  364                 ACPI_SERIAL_END(video);
  365                 break;
  366         default:
  367                 device_printf(sc->device, "unknown notify event 0x%x\n",
  368                     notify);
  369         }
  370 }
  371 
  372 static void
  373 acpi_video_power_profile(void *context)
  374 {
  375         int state;
  376         struct acpi_video_softc *sc;
  377         struct acpi_video_output *vo;
  378 
  379         sc = context;
  380         state = power_profile_get_state();
  381         if (state != POWER_PROFILE_PERFORMANCE &&
  382             state != POWER_PROFILE_ECONOMY)
  383                 return;
  384 
  385         ACPI_SERIAL_BEGIN(video);
  386         ACPI_SERIAL_BEGIN(video_output);
  387         STAILQ_FOREACH(vo, &sc->vid_outputs, vo_next) {
  388                 if (vo->vo_levels != NULL && vo->vo_brightness == -1)
  389                         vo_set_brightness(vo->handle,
  390                             state == POWER_PROFILE_ECONOMY ?
  391                             vo->vo_economy : vo->vo_fullpower);
  392         }
  393         ACPI_SERIAL_END(video_output);
  394         ACPI_SERIAL_END(video);
  395 }
  396 
  397 static void
  398 acpi_video_bind_outputs_subr(ACPI_HANDLE handle, UINT32 adr, void *context)
  399 {
  400         struct acpi_video_softc *sc;
  401         struct acpi_video_output *vo;
  402 
  403         ACPI_SERIAL_ASSERT(video);
  404         sc = context;
  405 
  406         STAILQ_FOREACH(vo, &sc->vid_outputs, vo_next) {
  407                 if (vo->adr == adr) {
  408                         acpi_video_vo_bind(vo, handle);
  409                         return;
  410                 }
  411         }
  412         vo = acpi_video_vo_init(adr);
  413         if (vo != NULL) {
  414                 acpi_video_vo_bind(vo, handle);
  415                 STAILQ_INSERT_TAIL(&sc->vid_outputs, vo, vo_next);
  416         }
  417 }
  418 
  419 static void
  420 acpi_video_bind_outputs(struct acpi_video_softc *sc)
  421 {
  422 
  423         ACPI_SERIAL_ASSERT(video);
  424         vid_enum_outputs(sc->handle, acpi_video_bind_outputs_subr, sc);
  425 }
  426 
  427 static struct acpi_video_output *
  428 acpi_video_vo_init(UINT32 adr)
  429 {
  430         struct acpi_video_output *vn, *vo, *vp;
  431         int n, x;
  432         char name[8], env[32];
  433         const char *type, *desc;
  434         struct acpi_video_output_queue *voqh;
  435 
  436         ACPI_SERIAL_ASSERT(video);
  437 
  438         switch (adr & DOD_DEVID_MASK) {
  439         case DOD_DEVID_MONITOR:
  440                 if ((adr & DOD_DEVID_MASK_FULL) == DOD_DEVID_LCD) {
  441                         /* DOD_DEVID_LCD is a common, backward compatible ID */
  442                         desc = "Internal/Integrated Digital Flat Panel";
  443                         type = "lcd";
  444                         voqh = &lcd_units;
  445                 } else {
  446                         desc = "VGA CRT or VESA Compatible Analog Monitor";
  447                         type = "crt";
  448                         voqh = &crt_units;
  449                 }
  450                 break;
  451         case DOD_DEVID_TV:
  452                 desc = "TV/HDTV or Analog-Video Monitor";
  453                 type = "tv";
  454                 voqh = &tv_units;
  455                 break;
  456         case DOD_DEVID_EXT:
  457                 desc = "External Digital Monitor";
  458                 type = "ext";
  459                 voqh = &ext_units;
  460                 break;
  461         case DOD_DEVID_INTDFP:
  462                 desc = "Internal/Integrated Digital Flat Panel";
  463                 type = "lcd";
  464                 voqh = &lcd_units;
  465                 break;
  466         default:
  467                 desc = "unknown output";
  468                 type = "out";
  469                 voqh = &other_units;
  470         }
  471 
  472         n = 0;
  473         vp = NULL;
  474         STAILQ_FOREACH(vn, voqh, vo_unit.next) {
  475                 if (vn->vo_unit.num != n)
  476                         break;
  477                 vp = vn;
  478                 n++;
  479         }
  480 
  481         snprintf(name, sizeof(name), "%s%d", type, n);
  482 
  483         vo = malloc(sizeof(*vo), M_ACPIVIDEO, M_NOWAIT);
  484         if (vo != NULL) {
  485                 vo->handle = NULL;
  486                 vo->adr = adr;
  487                 vo->vo_unit.num = n;
  488                 vo->vo_brightness = -1;
  489                 vo->vo_fullpower = -1;  /* TODO: override with tunables */
  490                 vo->vo_economy = -1;
  491                 vo->vo_numlevels = 0;
  492                 vo->vo_levels = NULL;
  493                 snprintf(env, sizeof(env), "hw.acpi.video.%s.fullpower", name);
  494                 if (getenv_int(env, &x))
  495                         vo->vo_fullpower = x;
  496                 snprintf(env, sizeof(env), "hw.acpi.video.%s.economy", name);
  497                 if (getenv_int(env, &x))
  498                         vo->vo_economy = x;
  499 
  500                 sysctl_ctx_init(&vo->vo_sysctl_ctx);
  501                 if (vp != NULL)
  502                         STAILQ_INSERT_AFTER(voqh, vp, vo, vo_unit.next);
  503                 else
  504                         STAILQ_INSERT_TAIL(voqh, vo, vo_unit.next);
  505                 if (acpi_video_sysctl_tree != NULL)
  506                         vo->vo_sysctl_tree =
  507                             SYSCTL_ADD_NODE(&vo->vo_sysctl_ctx,
  508                                 SYSCTL_CHILDREN(acpi_video_sysctl_tree),
  509                                 OID_AUTO, name, CTLFLAG_RD, 0, desc);
  510                 if (vo->vo_sysctl_tree != NULL) {
  511                         SYSCTL_ADD_PROC(&vo->vo_sysctl_ctx,
  512                             SYSCTL_CHILDREN(vo->vo_sysctl_tree),
  513                             OID_AUTO, "active",
  514                             CTLTYPE_INT|CTLFLAG_RW, vo, 0,
  515                             acpi_video_vo_active_sysctl, "I",
  516                             "current activity of this device");
  517                         SYSCTL_ADD_PROC(&vo->vo_sysctl_ctx,
  518                             SYSCTL_CHILDREN(vo->vo_sysctl_tree),
  519                             OID_AUTO, "brightness",
  520                             CTLTYPE_INT|CTLFLAG_RW, vo, 0,
  521                             acpi_video_vo_bright_sysctl, "I",
  522                             "current brightness level");
  523                         SYSCTL_ADD_PROC(&vo->vo_sysctl_ctx,
  524                             SYSCTL_CHILDREN(vo->vo_sysctl_tree),
  525                             OID_AUTO, "fullpower",
  526                             CTLTYPE_INT|CTLFLAG_RW, vo,
  527                             POWER_PROFILE_PERFORMANCE,
  528                             acpi_video_vo_presets_sysctl, "I",
  529                             "preset level for full power mode");
  530                         SYSCTL_ADD_PROC(&vo->vo_sysctl_ctx,
  531                             SYSCTL_CHILDREN(vo->vo_sysctl_tree),
  532                             OID_AUTO, "economy",
  533                             CTLTYPE_INT|CTLFLAG_RW, vo,
  534                             POWER_PROFILE_ECONOMY,
  535                             acpi_video_vo_presets_sysctl, "I",
  536                             "preset level for economy mode");
  537                         SYSCTL_ADD_PROC(&vo->vo_sysctl_ctx,
  538                             SYSCTL_CHILDREN(vo->vo_sysctl_tree),
  539                             OID_AUTO, "levels",
  540                             CTLTYPE_INT | CTLFLAG_RD, vo, 0,
  541                             acpi_video_vo_levels_sysctl, "I",
  542                             "supported brightness levels");
  543                 } else
  544                         printf("%s: sysctl node creation failed\n", type);
  545         } else
  546                 printf("%s: softc allocation failed\n", type);
  547 
  548         if (bootverbose) {
  549                 printf("found %s(%x)", desc, adr & DOD_DEVID_MASK_FULL);
  550                 printf(", idx#%x", adr & DOD_DEVID_MASK_DISPIDX);
  551                 printf(", port#%x", (adr & DOD_DEVID_MASK_DISPPORT) >> 4);
  552                 if (adr & DOD_BIOS)
  553                         printf(", detectable by BIOS");
  554                 if (adr & DOD_NONVGA)
  555                         printf(" (Non-VGA output device whose power "
  556                             "is related to the VGA device)");
  557                 printf(", head #%d\n",
  558                         (adr & DOD_HEAD_ID_MASK) >> DOD_HEAD_ID_SHIFT);
  559         }
  560         return (vo);
  561 }
  562 
  563 static void
  564 acpi_video_vo_bind(struct acpi_video_output *vo, ACPI_HANDLE handle)
  565 {
  566 
  567         ACPI_SERIAL_BEGIN(video_output);
  568         if (vo->vo_levels != NULL)
  569                 AcpiOsFree(vo->vo_levels);
  570         vo->handle = handle;
  571         vo->vo_numlevels = vo_get_brightness_levels(handle, &vo->vo_levels);
  572         if (vo->vo_numlevels >= 2) {
  573                 if (vo->vo_fullpower == -1
  574                     || acpi_video_vo_check_level(vo, vo->vo_fullpower) != 0)
  575                         /* XXX - can't deal with rebinding... */
  576                         vo->vo_fullpower = vo->vo_levels[BCL_FULLPOWER];
  577                 if (vo->vo_economy == -1
  578                     || acpi_video_vo_check_level(vo, vo->vo_economy) != 0)
  579                         /* XXX - see above. */
  580                         vo->vo_economy = vo->vo_levels[BCL_ECONOMY];
  581         }
  582         if (vo->vo_levels != NULL)
  583                 AcpiInstallNotifyHandler(handle, ACPI_DEVICE_NOTIFY,
  584                     acpi_video_vo_notify_handler, vo);
  585         ACPI_SERIAL_END(video_output);
  586 }
  587 
  588 static void
  589 acpi_video_vo_destroy(struct acpi_video_output *vo)
  590 {
  591         struct acpi_video_output_queue *voqh;
  592 
  593         ACPI_SERIAL_ASSERT(video);
  594         if (vo->vo_sysctl_tree != NULL) {
  595                 vo->vo_sysctl_tree = NULL;
  596                 sysctl_ctx_free(&vo->vo_sysctl_ctx);
  597         }
  598         if (vo->vo_levels != NULL) {
  599                 AcpiRemoveNotifyHandler(vo->handle, ACPI_DEVICE_NOTIFY,
  600                     acpi_video_vo_notify_handler);
  601                 AcpiOsFree(vo->vo_levels);
  602         }
  603 
  604         switch (vo->adr & DOD_DEVID_MASK) {
  605         case DOD_DEVID_MONITOR:
  606                 voqh = &crt_units;
  607                 break;
  608         case DOD_DEVID_TV:
  609                 voqh = &tv_units;
  610                 break;
  611         case DOD_DEVID_EXT:
  612                 voqh = &ext_units;
  613                 break;
  614         case DOD_DEVID_INTDFP:
  615                 voqh = &lcd_units;
  616                 break;
  617         default:
  618                 voqh = &other_units;
  619         }
  620         STAILQ_REMOVE(voqh, vo, acpi_video_output, vo_unit.next);
  621         free(vo, M_ACPIVIDEO);
  622 }
  623 
  624 static int
  625 acpi_video_vo_check_level(struct acpi_video_output *vo, int level)
  626 {
  627         int i;
  628 
  629         ACPI_SERIAL_ASSERT(video_output);
  630         if (vo->vo_levels == NULL)
  631                 return (ENODEV);
  632         for (i = 0; i < vo->vo_numlevels; i++)
  633                 if (vo->vo_levels[i] == level)
  634                         return (0);
  635         return (EINVAL);
  636 }
  637 
  638 static void
  639 acpi_video_vo_notify_handler(ACPI_HANDLE handle, UINT32 notify, void *context)
  640 {
  641         struct acpi_video_output *vo;
  642         int i, j, level, new_level;
  643 
  644         vo = context;
  645         ACPI_SERIAL_BEGIN(video_output);
  646         if (vo->handle != handle)
  647                 goto out;
  648 
  649         switch (notify) {
  650         case VID_NOTIFY_CYCLE_BRN:
  651                 if (vo->vo_numlevels <= 3)
  652                         goto out;
  653                 /* FALLTHROUGH */
  654         case VID_NOTIFY_INC_BRN:
  655         case VID_NOTIFY_DEC_BRN:
  656         case VID_NOTIFY_ZERO_BRN:
  657                 if (vo->vo_levels == NULL)
  658                         goto out;
  659                 level = vo_get_brightness(handle);
  660                 if (level < 0)
  661                         goto out;
  662                 break;
  663         default:
  664                 printf("unknown notify event 0x%x from %s\n",
  665                     notify, acpi_name(handle));
  666                 goto out;
  667         }
  668 
  669         new_level = level;
  670         switch (notify) {
  671         case VID_NOTIFY_CYCLE_BRN:
  672                 for (i = 2; i < vo->vo_numlevels; i++)
  673                         if (vo->vo_levels[i] == level) {
  674                                 new_level = vo->vo_numlevels > i + 1 ?
  675                                      vo->vo_levels[i + 1] : vo->vo_levels[2];
  676                                 break;
  677                         }
  678                 break;
  679         case VID_NOTIFY_INC_BRN:
  680         case VID_NOTIFY_DEC_BRN:
  681                 for (i = 0; i < vo->vo_numlevels; i++) {
  682                         j = vo->vo_levels[i];
  683                         if (notify == VID_NOTIFY_INC_BRN) {
  684                                 if (j > level &&
  685                                     (j < new_level || level == new_level))
  686                                         new_level = j;
  687                         } else {
  688                                 if (j < level &&
  689                                     (j > new_level || level == new_level))
  690                                         new_level = j;
  691                         }
  692                 }
  693                 break;
  694         case VID_NOTIFY_ZERO_BRN:
  695                 for (i = 0; i < vo->vo_numlevels; i++)
  696                         if (vo->vo_levels[i] == 0) {
  697                                 new_level = 0;
  698                                 break;
  699                         }
  700                 break;
  701         }
  702         if (new_level != level) {
  703                 vo_set_brightness(handle, new_level);
  704                 vo->vo_brightness = new_level;
  705         }
  706 
  707 out:
  708         ACPI_SERIAL_END(video_output);
  709 }
  710 
  711 /* ARGSUSED */
  712 static int
  713 acpi_video_vo_active_sysctl(SYSCTL_HANDLER_ARGS)
  714 {
  715         struct acpi_video_output *vo;
  716         int state, err;
  717 
  718         vo = (struct acpi_video_output *)arg1;
  719         if (vo->handle == NULL)
  720                 return (ENXIO);
  721         ACPI_SERIAL_BEGIN(video_output);
  722         state = (vo_get_device_status(vo->handle) & DCS_ACTIVE) ? 1 : 0;
  723         err = sysctl_handle_int(oidp, &state, 0, req);
  724         if (err != 0 || req->newptr == NULL)
  725                 goto out;
  726         vo_set_device_state(vo->handle,
  727             DSS_COMMIT | (state ? DSS_ACTIVE : DSS_INACTIVE));
  728 out:
  729         ACPI_SERIAL_END(video_output);
  730         return (err);
  731 }
  732 
  733 /* ARGSUSED */
  734 static int
  735 acpi_video_vo_bright_sysctl(SYSCTL_HANDLER_ARGS)
  736 {
  737         struct acpi_video_output *vo;
  738         int level, preset, err;
  739 
  740         vo = (struct acpi_video_output *)arg1;
  741         ACPI_SERIAL_BEGIN(video_output);
  742         if (vo->handle == NULL) {
  743                 err = ENXIO;
  744                 goto out;
  745         }
  746         if (vo->vo_levels == NULL) {
  747                 err = ENODEV;
  748                 goto out;
  749         }
  750 
  751         preset = (power_profile_get_state() == POWER_PROFILE_ECONOMY) ?
  752                   vo->vo_economy : vo->vo_fullpower;
  753         level = vo->vo_brightness;
  754         if (level == -1)
  755                 level = preset;
  756 
  757         err = sysctl_handle_int(oidp, &level, 0, req);
  758         if (err != 0 || req->newptr == NULL)
  759                 goto out;
  760         if (level < -1 || level > 100) {
  761                 err = EINVAL;
  762                 goto out;
  763         }
  764 
  765         if (level != -1 && (err = acpi_video_vo_check_level(vo, level)))
  766                 goto out;
  767         vo->vo_brightness = level;
  768         vo_set_brightness(vo->handle, (level == -1) ? preset : level);
  769 
  770 out:
  771         ACPI_SERIAL_END(video_output);
  772         return (err);
  773 }
  774 
  775 static int
  776 acpi_video_vo_presets_sysctl(SYSCTL_HANDLER_ARGS)
  777 {
  778         struct acpi_video_output *vo;
  779         int i, level, *preset, err;
  780 
  781         vo = (struct acpi_video_output *)arg1;
  782         ACPI_SERIAL_BEGIN(video_output);
  783         if (vo->handle == NULL) {
  784                 err = ENXIO;
  785                 goto out;
  786         }
  787         if (vo->vo_levels == NULL) {
  788                 err = ENODEV;
  789                 goto out;
  790         }
  791         preset = (arg2 == POWER_PROFILE_ECONOMY) ?
  792                   &vo->vo_economy : &vo->vo_fullpower;
  793         level = *preset;
  794         err = sysctl_handle_int(oidp, &level, 0, req);
  795         if (err != 0 || req->newptr == NULL)
  796                 goto out;
  797         if (level < -1 || level > 100) {
  798                 err = EINVAL;
  799                 goto out;
  800         }
  801         if (level == -1) {
  802                 i = (arg2 == POWER_PROFILE_ECONOMY) ?
  803                     BCL_ECONOMY : BCL_FULLPOWER;
  804                 level = vo->vo_levels[i];
  805         } else if ((err = acpi_video_vo_check_level(vo, level)) != 0)
  806                 goto out;
  807 
  808         if (vo->vo_brightness == -1 && (power_profile_get_state() == arg2))
  809                 vo_set_brightness(vo->handle, level);
  810         *preset = level;
  811 
  812 out:
  813         ACPI_SERIAL_END(video_output);
  814         return (err);
  815 }
  816 
  817 /* ARGSUSED */
  818 static int
  819 acpi_video_vo_levels_sysctl(SYSCTL_HANDLER_ARGS)
  820 {
  821         struct acpi_video_output *vo;
  822         int err;
  823 
  824         vo = (struct acpi_video_output *)arg1;
  825         ACPI_SERIAL_BEGIN(video_output);
  826         if (vo->vo_levels == NULL) {
  827                 err = ENODEV;
  828                 goto out;
  829         }
  830         if (req->newptr != NULL) {
  831                 err = EPERM;
  832                 goto out;
  833         }
  834         err = sysctl_handle_opaque(oidp, vo->vo_levels,
  835             vo->vo_numlevels * sizeof(*vo->vo_levels), req);
  836 
  837 out:
  838         ACPI_SERIAL_END(video_output);
  839         return (err);
  840 }
  841 
  842 static void
  843 vid_set_switch_policy(ACPI_HANDLE handle, UINT32 policy)
  844 {
  845         ACPI_STATUS status;
  846 
  847         status = acpi_SetInteger(handle, "_DOS", policy);
  848         if (ACPI_FAILURE(status))
  849                 printf("can't evaluate %s._DOS - %s\n",
  850                        acpi_name(handle), AcpiFormatException(status));
  851 }
  852 
  853 struct enum_callback_arg {
  854         void (*callback)(ACPI_HANDLE, UINT32, void *);
  855         void *context;
  856         ACPI_OBJECT *dod_pkg;
  857         int count;
  858 };
  859 
  860 static ACPI_STATUS
  861 vid_enum_outputs_subr(ACPI_HANDLE handle, UINT32 level __unused,
  862                       void *context, void **retp __unused)
  863 {
  864         ACPI_STATUS status;
  865         UINT32 adr, val;
  866         struct enum_callback_arg *argset;
  867         size_t i;
  868 
  869         ACPI_SERIAL_ASSERT(video);
  870         argset = context;
  871         status = acpi_GetInteger(handle, "_ADR", &adr);
  872         if (ACPI_FAILURE(status))
  873                 return (AE_OK);
  874 
  875         for (i = 0; i < argset->dod_pkg->Package.Count; i++) {
  876                 if (acpi_PkgInt32(argset->dod_pkg, i, &val) == 0 &&
  877                     (val & DOD_DEVID_MASK_FULL) == adr) {
  878                         argset->callback(handle, val, argset->context);
  879                         argset->count++;
  880                 }
  881         }
  882 
  883         return (AE_OK);
  884 }
  885 
  886 static int
  887 vid_enum_outputs(ACPI_HANDLE handle,
  888                  void (*callback)(ACPI_HANDLE, UINT32, void *), void *context)
  889 {
  890         ACPI_STATUS status;
  891         ACPI_BUFFER dod_buf;
  892         ACPI_OBJECT *res;
  893         struct enum_callback_arg argset;
  894 
  895         ACPI_SERIAL_ASSERT(video);
  896         dod_buf.Length = ACPI_ALLOCATE_BUFFER;
  897         dod_buf.Pointer = NULL;
  898         status = AcpiEvaluateObject(handle, "_DOD", NULL, &dod_buf);
  899         if (ACPI_FAILURE(status)) {
  900                 if (status != AE_NOT_FOUND)
  901                         printf("can't evaluate %s._DOD - %s\n",
  902                                acpi_name(handle), AcpiFormatException(status));
  903                 argset.count = -1;
  904                 goto out;
  905         }
  906         res = (ACPI_OBJECT *)dod_buf.Pointer;
  907         if (!ACPI_PKG_VALID(res, 1)) {
  908                 printf("evaluation of %s._DOD makes no sense\n",
  909                        acpi_name(handle));
  910                 argset.count = -1;
  911                 goto out;
  912         }
  913         if (callback == NULL) {
  914                 argset.count = res->Package.Count;
  915                 goto out;
  916         }
  917         argset.callback = callback;
  918         argset.context  = context;
  919         argset.dod_pkg  = res;
  920         argset.count    = 0;
  921         status = AcpiWalkNamespace(ACPI_TYPE_DEVICE, handle, 1,
  922             vid_enum_outputs_subr, NULL, &argset, NULL);
  923         if (ACPI_FAILURE(status))
  924                 printf("failed walking down %s - %s\n",
  925                        acpi_name(handle), AcpiFormatException(status));
  926 out:
  927         if (dod_buf.Pointer != NULL)
  928                 AcpiOsFree(dod_buf.Pointer);
  929         return (argset.count);
  930 }
  931 
  932 static int
  933 vo_get_brightness_levels(ACPI_HANDLE handle, int **levelp)
  934 {
  935         ACPI_STATUS status;
  936         ACPI_BUFFER bcl_buf;
  937         ACPI_OBJECT *res;
  938         int num, i, n, *levels;
  939 
  940         bcl_buf.Length = ACPI_ALLOCATE_BUFFER;
  941         bcl_buf.Pointer = NULL;
  942         status = AcpiEvaluateObject(handle, "_BCL", NULL, &bcl_buf);
  943         if (ACPI_FAILURE(status)) {
  944                 if (status != AE_NOT_FOUND)
  945                         printf("can't evaluate %s._BCL - %s\n",
  946                                acpi_name(handle), AcpiFormatException(status));
  947                 goto out;
  948         }
  949         res = (ACPI_OBJECT *)bcl_buf.Pointer;
  950         if (!ACPI_PKG_VALID(res, 2)) {
  951                 printf("evaluation of %s._BCL makes no sense\n",
  952                        acpi_name(handle));
  953                 goto out;
  954         }
  955         num = res->Package.Count;
  956         if (num < 2 || levelp == NULL)
  957                 goto out;
  958         levels = AcpiOsAllocate(num * sizeof(*levels));
  959         if (levels == NULL)
  960                 goto out;
  961         for (i = 0, n = 0; i < num; i++)
  962                 if (acpi_PkgInt32(res, i, &levels[n]) == 0)
  963                         n++;
  964         if (n < 2) {
  965                 AcpiOsFree(levels);
  966                 goto out;
  967         }
  968         *levelp = levels;
  969         return (n);
  970 
  971 out:
  972         if (bcl_buf.Pointer != NULL)
  973                 AcpiOsFree(bcl_buf.Pointer);
  974         return (0);
  975 }
  976 
  977 static int
  978 vo_get_brightness(ACPI_HANDLE handle)
  979 {
  980         UINT32 level;
  981         ACPI_STATUS status;
  982 
  983         ACPI_SERIAL_ASSERT(video_output);
  984         status = acpi_GetInteger(handle, "_BQC", &level);
  985         if (ACPI_FAILURE(status)) {
  986                 printf("can't evaluate %s._BQC - %s\n", acpi_name(handle),
  987                     AcpiFormatException(status));
  988                 return (-1);
  989         }
  990         if (level > 100)
  991                 return (-1);
  992 
  993         return (level);
  994 }
  995 
  996 static void
  997 vo_set_brightness(ACPI_HANDLE handle, int level)
  998 {
  999         ACPI_STATUS status;
 1000 
 1001         ACPI_SERIAL_ASSERT(video_output);
 1002         status = acpi_SetInteger(handle, "_BCM", level);
 1003         if (ACPI_FAILURE(status))
 1004                 printf("can't evaluate %s._BCM - %s\n",
 1005                        acpi_name(handle), AcpiFormatException(status));
 1006 }
 1007 
 1008 static UINT32
 1009 vo_get_device_status(ACPI_HANDLE handle)
 1010 {
 1011         UINT32 dcs;
 1012         ACPI_STATUS status;
 1013 
 1014         ACPI_SERIAL_ASSERT(video_output);
 1015         dcs = 0;
 1016         status = acpi_GetInteger(handle, "_DCS", &dcs);
 1017         if (ACPI_FAILURE(status))
 1018                 printf("can't evaluate %s._DCS - %s\n",
 1019                        acpi_name(handle), AcpiFormatException(status));
 1020 
 1021         return (dcs);
 1022 }
 1023 
 1024 static UINT32
 1025 vo_get_graphics_state(ACPI_HANDLE handle)
 1026 {
 1027         UINT32 dgs;
 1028         ACPI_STATUS status;
 1029 
 1030         dgs = 0;
 1031         status = acpi_GetInteger(handle, "_DGS", &dgs);
 1032         if (ACPI_FAILURE(status))
 1033                 printf("can't evaluate %s._DGS - %s\n",
 1034                        acpi_name(handle), AcpiFormatException(status));
 1035 
 1036         return (dgs);
 1037 }
 1038 
 1039 static void
 1040 vo_set_device_state(ACPI_HANDLE handle, UINT32 state)
 1041 {
 1042         ACPI_STATUS status;
 1043 
 1044         ACPI_SERIAL_ASSERT(video_output);
 1045         status = acpi_SetInteger(handle, "_DSS", state);
 1046         if (ACPI_FAILURE(status))
 1047                 printf("can't evaluate %s._DSS - %s\n",
 1048                        acpi_name(handle), AcpiFormatException(status));
 1049 }

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