sys/dev/acpi_support/acpi_toshiba.c

   1 /*-
   2  * Copyright (c) 2003 Hiroyuki Aizu <aizu@navi.org>
   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  */
  27
  28 #include <sys/cdefs.h>
  29 __FBSDID("$FreeBSD$");
  30
  31 #include "opt_acpi.h"
  32 #include <sys/param.h>
  33 #include <sys/kernel.h>
  34 #include <sys/module.h>
  35 #include <sys/bus.h>
  36
  37 #include <contrib/dev/acpica/include/acpi.h>
  38
  39 #include <dev/acpica/acpivar.h>
  40
  41 #define _COMPONENT      ACPI_OEM
  42 ACPI_MODULE_NAME("Toshiba")
  43
  44 /*
  45  * Toshiba HCI interface definitions
  46  *
  47  * HCI is Toshiba's "Hardware Control Interface" which is supposed to
  48  * be uniform across all their models.  Ideally we would just call
  49  * dedicated ACPI methods instead of using this primitive interface.
  50  * However, the ACPI methods seem to be incomplete in some areas (for
  51  * example they allow setting, but not reading, the LCD brightness
  52  * value), so this is still useful.
  53  */
  54
  55 #define METHOD_HCI              "GHCI"
  56 #define METHOD_HCI_ENABLE       "ENAB"
  57 #define METHOD_VIDEO            "DSSX"
  58
  59 /* Operations */
  60 #define HCI_SET                         0xFF00
  61 #define HCI_GET                         0xFE00
  62
  63 /* Return codes */
  64 #define HCI_SUCCESS                     0x0000
  65 #define HCI_FAILURE                     0x1000
  66 #define HCI_NOT_SUPPORTED               0x8000
  67 #define HCI_EMPTY                       0x8C00
  68
  69 /* Functions */
  70 #define HCI_REG_LCD_BACKLIGHT           0x0002
  71 #define HCI_REG_FAN                     0x0004
  72 #define HCI_REG_SYSTEM_EVENT            0x0016
  73 #define HCI_REG_VIDEO_OUTPUT            0x001C
  74 #define HCI_REG_HOTKEY_EVENT            0x001E
  75 #define HCI_REG_LCD_BRIGHTNESS          0x002A
  76 #define HCI_REG_CPU_SPEED               0x0032
  77
  78 /* Field definitions */
  79 #define HCI_FAN_SHIFT                   7
  80 #define HCI_LCD_BRIGHTNESS_BITS         3
  81 #define HCI_LCD_BRIGHTNESS_SHIFT        (16 - HCI_LCD_BRIGHTNESS_BITS)
  82 #define HCI_LCD_BRIGHTNESS_MAX          ((1 << HCI_LCD_BRIGHTNESS_BITS) - 1)
  83 #define HCI_VIDEO_OUTPUT_FLAG           0x0100
  84 #define HCI_VIDEO_OUTPUT_LCD            0x1
  85 #define HCI_VIDEO_OUTPUT_CRT            0x2
  86 #define HCI_VIDEO_OUTPUT_TV             0x4
  87 #define HCI_CPU_SPEED_BITS              3
  88 #define HCI_CPU_SPEED_SHIFT             (16 - HCI_CPU_SPEED_BITS)
  89 #define HCI_CPU_SPEED_MAX               ((1 << HCI_CPU_SPEED_BITS) - 1)
  90
  91 /* Key press/release events. */
  92 #define FN_F1_PRESS     0x013B
  93 #define FN_F1_RELEASE   0x01BB
  94 #define FN_F2_PRESS     0x013C
  95 #define FN_F2_RELEASE   0x01BC
  96 #define FN_F3_PRESS     0x013D
  97 #define FN_F3_RELEASE   0x01BD
  98 #define FN_F4_PRESS     0x013E
  99 #define FN_F4_RELEASE   0x01BE
 100 #define FN_F5_PRESS     0x013F
 101 #define FN_F5_RELEASE   0x01BF
 102 #define FN_F6_PRESS     0x0140
 103 #define FN_F6_RELEASE   0x01C0
 104 #define FN_F7_PRESS     0x0141
 105 #define FN_F7_RELEASE   0x01C1
 106 #define FN_F8_PRESS     0x0142
 107 #define FN_F8_RELEASE   0x01C2
 108 #define FN_F9_PRESS     0x0143
 109 #define FN_F9_RELEASE   0x01C3
 110 #define FN_BS_PRESS     0x010E
 111 #define FN_BS_RELEASE   0x018E
 112 #define FN_ESC_PRESS    0x0101
 113 #define FN_ESC_RELEASE  0x0181
 114 #define FN_KNJ_PRESS    0x0129
 115 #define FN_KNJ_RELEASE  0x01A9
 116
 117 /* HCI register definitions. */
 118 #define HCI_WORDS       6               /* Number of registers */
 119 #define HCI_REG_AX      0               /* Operation, then return value */
 120 #define HCI_REG_BX      1               /* Function */
 121 #define HCI_REG_CX      2               /* Argument (in or out) */
 122 #define HCI_REG_DX      3               /* Unused? */
 123 #define HCI_REG_SI      4               /* Unused? */
 124 #define HCI_REG_DI      5               /* Unused? */
 125
 126 struct acpi_toshiba_softc {
 127         device_t        dev;
 128         ACPI_HANDLE     handle;
 129         ACPI_HANDLE     video_handle;
 130         struct          sysctl_ctx_list sysctl_ctx;
 131         struct          sysctl_oid *sysctl_tree;
 132 };
 133
 134 /* Prototype for HCI functions for getting/setting a value. */
 135 typedef int     hci_fn_t(ACPI_HANDLE, int, UINT32 *);
 136
 137 static int      acpi_toshiba_probe(device_t dev);
 138 static int      acpi_toshiba_attach(device_t dev);
 139 static int      acpi_toshiba_detach(device_t dev);
 140 static int      acpi_toshiba_sysctl(SYSCTL_HANDLER_ARGS);
 141 static hci_fn_t hci_force_fan;
 142 static hci_fn_t hci_video_output;
 143 static hci_fn_t hci_lcd_brightness;
 144 static hci_fn_t hci_lcd_backlight;
 145 static hci_fn_t hci_cpu_speed;
 146 static int      hci_call(ACPI_HANDLE h, int op, int function, UINT32 *arg);
 147 static void     hci_key_action(struct acpi_toshiba_softc *sc, ACPI_HANDLE h,
 148                     UINT32 key);
 149 static void     acpi_toshiba_notify(ACPI_HANDLE h, UINT32 notify,
 150                     void *context);
 151 static int      acpi_toshiba_video_probe(device_t dev);
 152 static int      acpi_toshiba_video_attach(device_t dev);
 153
 154 ACPI_SERIAL_DECL(toshiba, "ACPI Toshiba Extras");
 155
 156 /* Table of sysctl names and HCI functions to call. */
 157 static struct {
 158         char            *name;
 159         hci_fn_t        *handler;
 160 } sysctl_table[] = {
 161         /* name,                handler */
 162         {"force_fan",           hci_force_fan},
 163         {"video_output",        hci_video_output},
 164         {"lcd_brightness",      hci_lcd_brightness},
 165         {"lcd_backlight",       hci_lcd_backlight},
 166         {"cpu_speed",           hci_cpu_speed},
 167         {NULL, NULL}
 168 };
 169
 170 static device_method_t acpi_toshiba_methods[] = {
 171         DEVMETHOD(device_probe,         acpi_toshiba_probe),
 172         DEVMETHOD(device_attach,        acpi_toshiba_attach),
 173         DEVMETHOD(device_detach,        acpi_toshiba_detach),
 174
 175         DEVMETHOD_END
 176 };
 177
 178 static driver_t acpi_toshiba_driver = {
 179         "acpi_toshiba",
 180         acpi_toshiba_methods,
 181         sizeof(struct acpi_toshiba_softc),
 182 };
 183
 184 static devclass_t acpi_toshiba_devclass;
 185 DRIVER_MODULE(acpi_toshiba, acpi, acpi_toshiba_driver, acpi_toshiba_devclass,
 186     0, 0);
 187 MODULE_DEPEND(acpi_toshiba, acpi, 1, 1, 1);
 188
 189 static device_method_t acpi_toshiba_video_methods[] = {
 190         DEVMETHOD(device_probe,         acpi_toshiba_video_probe),
 191         DEVMETHOD(device_attach,        acpi_toshiba_video_attach),
 192
 193         DEVMETHOD_END
 194 };
 195
 196 static driver_t acpi_toshiba_video_driver = {
 197         "acpi_toshiba_video",
 198         acpi_toshiba_video_methods,
 199         0,
 200 };
 201
 202 static devclass_t acpi_toshiba_video_devclass;
 203 DRIVER_MODULE(acpi_toshiba_video, acpi, acpi_toshiba_video_driver,
 204     acpi_toshiba_video_devclass, 0, 0);
 205 MODULE_DEPEND(acpi_toshiba_video, acpi, 1, 1, 1);
 206
 207 static int      enable_fn_keys = 1;
 208 TUNABLE_INT("hw.acpi.toshiba.enable_fn_keys", &enable_fn_keys);
 209
 210 /*
 211  * HID      Model
 212  * -------------------------------------
 213  * TOS6200  Libretto L Series
 214  *          Dynabook Satellite 2455
 215  *          Dynabook SS 3500
 216  * TOS6207  Dynabook SS2110 Series
 217  * TOS6208  SPA40
 218  */
 219 static int
 220 acpi_toshiba_probe(device_t dev)
 221 {
 222         static char *tosh_ids[] = { "TOS6200", "TOS6207", "TOS6208", NULL };
 223         int rv;
 224
 225         if (acpi_disabled("toshiba") ||
 226             device_get_unit(dev) != 0)
 227                 return (ENXIO);
 228         rv = ACPI_ID_PROBE(device_get_parent(dev), dev, tosh_ids, NULL);
 229         if (rv <= 0)
 230                 device_set_desc(dev, "Toshiba HCI Extras");
 231         return (rv);
 232 }
 233
 234 static int
 235 acpi_toshiba_attach(device_t dev)
 236 {
 237         struct          acpi_toshiba_softc *sc;
 238         struct          acpi_softc *acpi_sc;
 239         ACPI_STATUS     status;
 240         int             i;
 241
 242         sc = device_get_softc(dev);
 243         sc->dev = dev;
 244         sc->handle = acpi_get_handle(dev);
 245
 246         acpi_sc = acpi_device_get_parent_softc(dev);
 247         sysctl_ctx_init(&sc->sysctl_ctx);
 248         sc->sysctl_tree = SYSCTL_ADD_NODE(&sc->sysctl_ctx,
 249             SYSCTL_CHILDREN(acpi_sc->acpi_sysctl_tree), OID_AUTO,
 250             "toshiba", CTLFLAG_RD | CTLFLAG_MPSAFE, 0, "");
 251
 252         for (i = 0; sysctl_table[i].name != NULL; i++) {
 253                 SYSCTL_ADD_PROC(&sc->sysctl_ctx,
 254                     SYSCTL_CHILDREN(sc->sysctl_tree), OID_AUTO,
 255                     sysctl_table[i].name,
 256                     CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_ANYBODY |
 257                     CTLFLAG_NEEDGIANT, sc, i, acpi_toshiba_sysctl, "I", "");
 258         }
 259
 260         if (enable_fn_keys != 0) {
 261                 status = AcpiEvaluateObject(sc->handle, METHOD_HCI_ENABLE,
 262                                             NULL, NULL);
 263                 if (ACPI_FAILURE(status)) {
 264                         device_printf(dev, "enable FN keys failed\n");
 265                         sysctl_ctx_free(&sc->sysctl_ctx);
 266                         return (ENXIO);
 267                 }
 268                 AcpiInstallNotifyHandler(sc->handle, ACPI_DEVICE_NOTIFY,
 269                                          acpi_toshiba_notify, sc);
 270         }
 271
 272         return (0);
 273 }
 274
 275 static int
 276 acpi_toshiba_detach(device_t dev)
 277 {
 278         struct          acpi_toshiba_softc *sc;
 279
 280         sc = device_get_softc(dev);
 281         if (enable_fn_keys != 0) {
 282                 AcpiRemoveNotifyHandler(sc->handle, ACPI_DEVICE_NOTIFY,
 283                                         acpi_toshiba_notify);
 284         }
 285         sysctl_ctx_free(&sc->sysctl_ctx);
 286
 287         return (0);
 288 }
 289
 290 static int
 291 acpi_toshiba_sysctl(SYSCTL_HANDLER_ARGS)
 292 {
 293         struct          acpi_toshiba_softc *sc;
 294         UINT32          arg;
 295         int             function, error = 0;
 296         hci_fn_t        *handler;
 297
 298         sc = (struct acpi_toshiba_softc *)oidp->oid_arg1;
 299         function = oidp->oid_arg2;
 300         handler = sysctl_table[function].handler;
 301
 302         /* Get the current value from the appropriate function. */
 303         ACPI_SERIAL_BEGIN(toshiba);
 304         error = handler(sc->handle, HCI_GET, &arg);
 305         if (error != 0)
 306                 goto out;
 307
 308         /* Send the current value to the user and return if no new value. */
 309         error = sysctl_handle_int(oidp, &arg, 0, req);
 310         if (error != 0 || req->newptr == NULL)
 311                 goto out;
 312
 313         /* Set the new value via the appropriate function. */
 314         error = handler(sc->handle, HCI_SET, &arg);
 315
 316 out:
 317         ACPI_SERIAL_END(toshiba);
 318         return (error);
 319 }
 320
 321 static int
 322 hci_force_fan(ACPI_HANDLE h, int op, UINT32 *state)
 323 {
 324         int             ret;
 325
 326         ACPI_SERIAL_ASSERT(toshiba);
 327         if (op == HCI_SET) {
 328                 if (*state > 1)
 329                         return (EINVAL);
 330                 *state <<= HCI_FAN_SHIFT;
 331         }
 332         ret = hci_call(h, op, HCI_REG_FAN, state);
 333         if (ret == 0 && op == HCI_GET)
 334                 *state >>= HCI_FAN_SHIFT;
 335         return (ret);
 336 }
 337
 338 static int
 339 hci_video_output(ACPI_HANDLE h, int op, UINT32 *video_output)
 340 {
 341         int             ret;
 342         ACPI_STATUS     status;
 343
 344         ACPI_SERIAL_ASSERT(toshiba);
 345         if (op == HCI_SET) {
 346                 if (*video_output < 1 || *video_output > 7)
 347                         return (EINVAL);
 348                 if (h == NULL)
 349                         return (ENXIO);
 350                 *video_output |= HCI_VIDEO_OUTPUT_FLAG;
 351                 status = acpi_SetInteger(h, METHOD_VIDEO, *video_output);
 352                 if (ACPI_SUCCESS(status))
 353                         ret = 0;
 354                 else
 355                         ret = ENXIO;
 356         } else {
 357                 ret = hci_call(h, op, HCI_REG_VIDEO_OUTPUT, video_output);
 358                 if (ret == 0)
 359                         *video_output &= 0xff;
 360         }
 361
 362         return (ret);
 363 }
 364
 365 static int
 366 hci_lcd_brightness(ACPI_HANDLE h, int op, UINT32 *brightness)
 367 {
 368         int             ret;
 369
 370         ACPI_SERIAL_ASSERT(toshiba);
 371         if (op == HCI_SET) {
 372                 if (*brightness > HCI_LCD_BRIGHTNESS_MAX)
 373                         return (EINVAL);
 374                 *brightness <<= HCI_LCD_BRIGHTNESS_SHIFT;
 375         }
 376         ret = hci_call(h, op, HCI_REG_LCD_BRIGHTNESS, brightness);
 377         if (ret == 0 && op == HCI_GET)
 378                 *brightness >>= HCI_LCD_BRIGHTNESS_SHIFT;
 379         return (ret);
 380 }
 381
 382 static int
 383 hci_lcd_backlight(ACPI_HANDLE h, int op, UINT32 *backlight)
 384 {
 385
 386         ACPI_SERIAL_ASSERT(toshiba);
 387         if (op == HCI_SET) {
 388                 if (*backlight > 1)
 389                         return (EINVAL);
 390         }
 391         return (hci_call(h, op, HCI_REG_LCD_BACKLIGHT, backlight));
 392 }
 393
 394 static int
 395 hci_cpu_speed(ACPI_HANDLE h, int op, UINT32 *speed)
 396 {
 397         int             ret;
 398
 399         ACPI_SERIAL_ASSERT(toshiba);
 400         if (op == HCI_SET) {
 401                 if (*speed > HCI_CPU_SPEED_MAX)
 402                         return (EINVAL);
 403                 *speed <<= HCI_CPU_SPEED_SHIFT;
 404         }
 405         ret = hci_call(h, op, HCI_REG_CPU_SPEED, speed);
 406         if (ret == 0 && op == HCI_GET)
 407                 *speed >>= HCI_CPU_SPEED_SHIFT;
 408         return (ret);
 409 }
 410
 411 static int
 412 hci_call(ACPI_HANDLE h, int op, int function, UINT32 *arg)
 413 {
 414         ACPI_OBJECT_LIST args;
 415         ACPI_BUFFER     results;
 416         ACPI_OBJECT     obj[HCI_WORDS];
 417         ACPI_OBJECT     *res;
 418         int             status, i, ret;
 419
 420         ACPI_SERIAL_ASSERT(toshiba);
 421         status = ENXIO;
 422
 423         for (i = 0; i < HCI_WORDS; i++) {
 424                 obj[i].Type = ACPI_TYPE_INTEGER;
 425                 obj[i].Integer.Value = 0;
 426         }
 427         obj[HCI_REG_AX].Integer.Value = op;
 428         obj[HCI_REG_BX].Integer.Value = function;
 429         if (op == HCI_SET)
 430                 obj[HCI_REG_CX].Integer.Value = *arg;
 431
 432         args.Count = HCI_WORDS;
 433         args.Pointer = obj;
 434         results.Pointer = NULL;
 435         results.Length = ACPI_ALLOCATE_BUFFER;
 436         if (ACPI_FAILURE(AcpiEvaluateObject(h, METHOD_HCI, &args, &results)))
 437                 goto end;
 438         res = (ACPI_OBJECT *)results.Pointer;
 439         if (!ACPI_PKG_VALID(res, HCI_WORDS)) {
 440                 printf("toshiba: invalid package!\n");
 441                 return (ENXIO);
 442         }
 443
 444         acpi_PkgInt32(res, HCI_REG_AX, &ret);
 445         if (ret == HCI_SUCCESS) {
 446                 if (op == HCI_GET)
 447                         acpi_PkgInt32(res, HCI_REG_CX, arg);
 448                 status = 0;
 449         } else if (function == HCI_REG_SYSTEM_EVENT && op == HCI_GET &&
 450             ret == HCI_NOT_SUPPORTED) {
 451                 /*
 452                  * Sometimes system events are disabled without us requesting
 453                  * it.  This workaround attempts to re-enable them.
 454                  *
 455                  * XXX This call probably shouldn't be recursive.  Queueing
 456                  * a task via AcpiOsQueueForExecution() might be better.
 457                  */
 458                  i = 1;
 459                  hci_call(h, HCI_SET, HCI_REG_SYSTEM_EVENT, &i);
 460         }
 461
 462 end:
 463         if (results.Pointer != NULL)
 464                 AcpiOsFree(results.Pointer);
 465
 466         return (status);
 467 }
 468
 469 /*
 470  * Perform a few actions based on the keypress.  Users can extend this
 471  * functionality by reading the keystrokes we send to devd(8).
 472  */
 473 static void
 474 hci_key_action(struct acpi_toshiba_softc *sc, ACPI_HANDLE h, UINT32 key)
 475 {
 476         UINT32          arg;
 477
 478         ACPI_SERIAL_ASSERT(toshiba);
 479         switch (key) {
 480         case FN_F6_RELEASE:
 481                 /* Decrease LCD brightness. */
 482                 hci_lcd_brightness(h, HCI_GET, &arg);
 483                 if (arg-- == 0)
 484                         arg = 0;
 485                 else
 486                         hci_lcd_brightness(h, HCI_SET, &arg);
 487                 break;
 488         case FN_F7_RELEASE:
 489                 /* Increase LCD brightness. */
 490                 hci_lcd_brightness(h, HCI_GET, &arg);
 491                 if (arg++ == 7)
 492                         arg = 7;
 493                 else
 494                         hci_lcd_brightness(h, HCI_SET, &arg);
 495                 break;
 496         case FN_F5_RELEASE:
 497                 /* Cycle through video outputs. */
 498                 hci_video_output(h, HCI_GET, &arg);
 499                 arg = (arg + 1) % 7;
 500                 hci_video_output(sc->video_handle, HCI_SET, &arg);
 501                 break;
 502         case FN_F8_RELEASE:
 503                 /* Toggle LCD backlight. */
 504                 hci_lcd_backlight(h, HCI_GET, &arg);
 505                 arg = (arg != 0) ? 0 : 1;
 506                 hci_lcd_backlight(h, HCI_SET, &arg);
 507                 break;
 508         case FN_ESC_RELEASE:
 509                 /* Toggle forcing fan on. */
 510                 hci_force_fan(h, HCI_GET, &arg);
 511                 arg = (arg != 0) ? 0 : 1;
 512                 hci_force_fan(h, HCI_SET, &arg);
 513                 break;
 514         }
 515 }
 516
 517 static void
 518 acpi_toshiba_notify(ACPI_HANDLE h, UINT32 notify, void *context)
 519 {
 520         struct          acpi_toshiba_softc *sc;
 521         UINT32          key;
 522
 523         sc = (struct acpi_toshiba_softc *)context;
 524
 525         if (notify == 0x80) {
 526                 ACPI_SERIAL_BEGIN(toshiba);
 527                 while (hci_call(h, HCI_GET, HCI_REG_SYSTEM_EVENT, &key) == 0) {
 528                         hci_key_action(sc, h, key);
 529                         acpi_UserNotify("TOSHIBA", h, (uint8_t)key);
 530                 }
 531                 ACPI_SERIAL_END(toshiba);
 532         } else
 533                 device_printf(sc->dev, "unknown notify: 0x%x\n", notify);
 534 }
 535
 536 /*
 537  * Toshiba video pseudo-device to provide the DSSX method.
 538  *
 539  * HID      Model
 540  * -------------------------------------
 541  * TOS6201  Libretto L Series
 542  */
 543 static int
 544 acpi_toshiba_video_probe(device_t dev)
 545 {
 546         static char *vid_ids[] = { "TOS6201", NULL };
 547         int rv;
 548
 549         if (acpi_disabled("toshiba") ||
 550             device_get_unit(dev) != 0)
 551                 return (ENXIO);
 552
 553         device_quiet(dev);
 554         rv = ACPI_ID_PROBE(device_get_parent(dev), dev, vid_ids, NULL);
 555         if (rv <= 0)
 556                 device_set_desc(dev, "Toshiba Video");
 557         return (rv);
 558 }
 559
 560 static int
 561 acpi_toshiba_video_attach(device_t dev)
 562 {
 563         struct          acpi_toshiba_softc *sc;
 564
 565         sc = devclass_get_softc(acpi_toshiba_devclass, 0);
 566         if (sc == NULL)
 567                 return (ENXIO);
 568         sc->video_handle = acpi_get_handle(dev);
 569         return (0);
 570 }