sys/dev/acpica/acpi_toshiba/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  * $FreeBSD: src/sys/dev/acpi_support/acpi_toshiba.c,v 1.18 2009/06/05 18:44:36 jkim
  27  */
  28
  29 #include "opt_acpi.h"
  30 #include <sys/param.h>
  31 #include <sys/kernel.h>
  32 #include <sys/module.h>
  33 #include <sys/bus.h>
  34
  35 #include "acpi.h"
  36
  37 #include <dev/acpica/acpivar.h>
  38
  39 #define _COMPONENT      ACPI_OEM
  40 ACPI_MODULE_NAME("Toshiba")
  41
  42 /*
  43  * Toshiba HCI interface definitions
  44  *
  45  * HCI is Toshiba's "Hardware Control Interface" which is supposed to
  46  * be uniform across all their models.  Ideally we would just call
  47  * dedicated ACPI methods instead of using this primitive interface.
  48  * However, the ACPI methods seem to be incomplete in some areas (for
  49  * example they allow setting, but not reading, the LCD brightness
  50  * value), so this is still useful.
  51  */
  52
  53 #define METHOD_HCI              "GHCI"
  54 #define METHOD_HCI_ENABLE       "ENAB"
  55 #define METHOD_VIDEO            "DSSX"
  56
  57 /* Operations */
  58 #define HCI_SET                         0xFF00
  59 #define HCI_GET                         0xFE00
  60
  61 /* Return codes */
  62 #define HCI_SUCCESS                     0x0000
  63 #define HCI_FAILURE                     0x1000
  64 #define HCI_NOT_SUPPORTED               0x8000
  65 #define HCI_EMPTY                       0x8C00
  66
  67 /* Functions */
  68 #define HCI_REG_LCD_BACKLIGHT           0x0002
  69 #define HCI_REG_FAN                     0x0004
  70 #define HCI_REG_SYSTEM_EVENT            0x0016
  71 #define HCI_REG_VIDEO_OUTPUT            0x001C
  72 #define HCI_REG_HOTKEY_EVENT            0x001E
  73 #define HCI_REG_LCD_BRIGHTNESS          0x002A
  74 #define HCI_REG_CPU_SPEED               0x0032
  75
  76 /* Field definitions */
  77 #define HCI_FAN_SHIFT                   7
  78 #define HCI_LCD_BRIGHTNESS_BITS         3
  79 #define HCI_LCD_BRIGHTNESS_SHIFT        (16 - HCI_LCD_BRIGHTNESS_BITS)
  80 #define HCI_LCD_BRIGHTNESS_MAX          ((1 << HCI_LCD_BRIGHTNESS_BITS) - 1)
  81 #define HCI_VIDEO_OUTPUT_FLAG           0x0100
  82 #define HCI_VIDEO_OUTPUT_LCD            0x1
  83 #define HCI_VIDEO_OUTPUT_CRT            0x2
  84 #define HCI_VIDEO_OUTPUT_TV             0x4
  85 #define HCI_CPU_SPEED_BITS              3
  86 #define HCI_CPU_SPEED_SHIFT             (16 - HCI_CPU_SPEED_BITS)
  87 #define HCI_CPU_SPEED_MAX               ((1 << HCI_CPU_SPEED_BITS) - 1)
  88
  89 /* Key press/release events. */
  90 #define FN_F1_PRESS     0x013B
  91 #define FN_F1_RELEASE   0x01BB
  92 #define FN_F2_PRESS     0x013C
  93 #define FN_F2_RELEASE   0x01BC
  94 #define FN_F3_PRESS     0x013D
  95 #define FN_F3_RELEASE   0x01BD
  96 #define FN_F4_PRESS     0x013E
  97 #define FN_F4_RELEASE   0x01BE
  98 #define FN_F5_PRESS     0x013F
  99 #define FN_F5_RELEASE   0x01BF
 100 #define FN_F6_PRESS     0x0140
 101 #define FN_F6_RELEASE   0x01C0
 102 #define FN_F7_PRESS     0x0141
 103 #define FN_F7_RELEASE   0x01C1
 104 #define FN_F8_PRESS     0x0142
 105 #define FN_F8_RELEASE   0x01C2
 106 #define FN_F9_PRESS     0x0143
 107 #define FN_F9_RELEASE   0x01C3
 108 #define FN_BS_PRESS     0x010E
 109 #define FN_BS_RELEASE   0x018E
 110 #define FN_ESC_PRESS    0x0101
 111 #define FN_ESC_RELEASE  0x0181
 112 #define FN_KNJ_PRESS    0x0129
 113 #define FN_KNJ_RELEASE  0x01A9
 114
 115 /* HCI register definitions. */
 116 #define HCI_WORDS       6               /* Number of registers */
 117 #define HCI_REG_AX      0               /* Operation, then return value */
 118 #define HCI_REG_BX      1               /* Function */
 119 #define HCI_REG_CX      2               /* Argument (in or out) */
 120 #define HCI_REG_DX      3               /* Unused? */
 121 #define HCI_REG_SI      4               /* Unused? */
 122 #define HCI_REG_DI      5               /* Unused? */
 123
 124 struct acpi_toshiba_softc {
 125         device_t        dev;
 126         ACPI_HANDLE     handle;
 127         ACPI_HANDLE     video_handle;
 128         struct          sysctl_ctx_list sysctl_ctx;
 129         struct          sysctl_oid *sysctl_tree;
 130 };
 131
 132 /* Prototype for HCI functions for getting/setting a value. */
 133 typedef int     hci_fn_t(ACPI_HANDLE, int, UINT32 *);
 134
 135 static int      acpi_toshiba_probe(device_t dev);
 136 static int      acpi_toshiba_attach(device_t dev);
 137 static int      acpi_toshiba_detach(device_t dev);
 138 static int      acpi_toshiba_sysctl(SYSCTL_HANDLER_ARGS);
 139 static hci_fn_t hci_force_fan;
 140 static hci_fn_t hci_video_output;
 141 static hci_fn_t hci_lcd_brightness;
 142 static hci_fn_t hci_lcd_backlight;
 143 static hci_fn_t hci_cpu_speed;
 144 static int      hci_call(ACPI_HANDLE h, int op, int function, UINT32 *arg);
 145 static void     hci_key_action(struct acpi_toshiba_softc *sc, ACPI_HANDLE h,
 146                     UINT32 key);
 147 static void     acpi_toshiba_notify(ACPI_HANDLE h, UINT32 notify,
 148                     void *context);
 149 static int      acpi_toshiba_video_probe(device_t dev);
 150 static int      acpi_toshiba_video_attach(device_t dev);
 151
 152 ACPI_SERIAL_DECL(toshiba, "ACPI Toshiba Extras");
 153
 154 /* Table of sysctl names and HCI functions to call. */
 155 static struct {
 156         char            *name;
 157         hci_fn_t        *handler;
 158 } sysctl_table[] = {
 159         /* name,                handler */
 160         {"force_fan",           hci_force_fan},
 161         {"video_output",        hci_video_output},
 162         {"lcd_brightness",      hci_lcd_brightness},
 163         {"lcd_backlight",       hci_lcd_backlight},
 164         {"cpu_speed",           hci_cpu_speed},
 165         {NULL, NULL}
 166 };
 167
 168 static device_method_t acpi_toshiba_methods[] = {
 169         DEVMETHOD(device_probe,         acpi_toshiba_probe),
 170         DEVMETHOD(device_attach,        acpi_toshiba_attach),
 171         DEVMETHOD(device_detach,        acpi_toshiba_detach),
 172
 173         DEVMETHOD_END
 174 };
 175
 176 static driver_t acpi_toshiba_driver = {
 177         "acpi_toshiba",
 178         acpi_toshiba_methods,
 179         sizeof(struct acpi_toshiba_softc),
 180 };
 181
 182 static devclass_t acpi_toshiba_devclass;
 183 DRIVER_MODULE(acpi_toshiba, acpi, acpi_toshiba_driver, acpi_toshiba_devclass,
 184     NULL, NULL);
 185 MODULE_DEPEND(acpi_toshiba, acpi, 1, 1, 1);
 186
 187 static device_method_t acpi_toshiba_video_methods[] = {
 188         DEVMETHOD(device_probe,         acpi_toshiba_video_probe),
 189         DEVMETHOD(device_attach,        acpi_toshiba_video_attach),
 190
 191         DEVMETHOD_END
 192 };
 193
 194 static driver_t acpi_toshiba_video_driver = {
 195         "acpi_toshiba_video",
 196         acpi_toshiba_video_methods,
 197         0,
 198 };
 199
 200 static devclass_t acpi_toshiba_video_devclass;
 201 DRIVER_MODULE(acpi_toshiba_video, acpi, acpi_toshiba_video_driver,
 202     acpi_toshiba_video_devclass, NULL, NULL);
 203 MODULE_DEPEND(acpi_toshiba_video, acpi, 1, 1, 1);
 204
 205 static int      enable_fn_keys = 1;
 206 TUNABLE_INT("hw.acpi.toshiba.enable_fn_keys", &enable_fn_keys);
 207
 208 /*
 209  * HID      Model
 210  * -------------------------------------
 211  * TOS6200  Libretto L Series
 212  *          Dynabook Satellite 2455
 213  *          Dynabook SS 3500
 214  * TOS6207  Dynabook SS2110 Series
 215  * TOS6208  SPA40
 216  */
 217 static int
 218 acpi_toshiba_probe(device_t dev)
 219 {
 220         static char *tosh_ids[] = { "TOS6200", "TOS6207", "TOS6208", NULL };
 221
 222         if (acpi_disabled("toshiba") ||
 223             ACPI_ID_PROBE(device_get_parent(dev), dev, tosh_ids) == NULL ||
 224             device_get_unit(dev) != 0)
 225                 return (ENXIO);
 226
 227         device_set_desc(dev, "Toshiba HCI Extras");
 228         return (0);
 229 }
 230
 231 static int
 232 acpi_toshiba_attach(device_t dev)
 233 {
 234         struct          acpi_toshiba_softc *sc;
 235         struct          acpi_softc *acpi_sc;
 236         ACPI_STATUS     status;
 237         int             i;
 238
 239         sc = device_get_softc(dev);
 240         sc->dev = dev;
 241         sc->handle = acpi_get_handle(dev);
 242         ACPI_SERIAL_INIT(toshiba);
 243
 244         acpi_sc = acpi_device_get_parent_softc(dev);
 245         sysctl_ctx_init(&sc->sysctl_ctx);
 246         sc->sysctl_tree = SYSCTL_ADD_NODE(&sc->sysctl_ctx,
 247             SYSCTL_CHILDREN(acpi_sc->acpi_sysctl_tree), OID_AUTO,
 248             "toshiba", CTLFLAG_RD, 0, "");
 249
 250         for (i = 0; sysctl_table[i].name != NULL; i++) {
 251                 SYSCTL_ADD_PROC(&sc->sysctl_ctx,
 252                     SYSCTL_CHILDREN(sc->sysctl_tree), OID_AUTO,
 253                     sysctl_table[i].name,
 254                     CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_ANYBODY,
 255                     sc, i, acpi_toshiba_sysctl, "I", "");
 256         }
 257
 258         if (enable_fn_keys != 0) {
 259                 status = AcpiEvaluateObject(sc->handle, METHOD_HCI_ENABLE,
 260                                             NULL, NULL);
 261                 if (ACPI_FAILURE(status)) {
 262                         device_printf(dev, "enable FN keys failed\n");
 263                         sysctl_ctx_free(&sc->sysctl_ctx);
 264                         return (ENXIO);
 265                 }
 266                 AcpiInstallNotifyHandler(sc->handle, ACPI_DEVICE_NOTIFY,
 267                                          acpi_toshiba_notify, sc);
 268         }
 269
 270         return (0);
 271 }
 272
 273 static int
 274 acpi_toshiba_detach(device_t dev)
 275 {
 276         struct          acpi_toshiba_softc *sc;
 277
 278         sc = device_get_softc(dev);
 279         if (enable_fn_keys != 0) {
 280                 AcpiRemoveNotifyHandler(sc->handle, ACPI_DEVICE_NOTIFY,
 281                                         acpi_toshiba_notify);
 282         }
 283         sysctl_ctx_free(&sc->sysctl_ctx);
 284
 285         return (0);
 286 }
 287
 288 static int
 289 acpi_toshiba_sysctl(SYSCTL_HANDLER_ARGS)
 290 {
 291         struct          acpi_toshiba_softc *sc;
 292         UINT32          arg;
 293         int             function, error = 0;
 294         hci_fn_t        *handler;
 295
 296         sc = (struct acpi_toshiba_softc *)oidp->oid_arg1;
 297         function = oidp->oid_arg2;
 298         handler = sysctl_table[function].handler;
 299
 300         /* Get the current value from the appropriate function. */
 301         ACPI_SERIAL_BEGIN(toshiba);
 302         error = handler(sc->handle, HCI_GET, &arg);
 303         if (error != 0)
 304                 goto out;
 305
 306         /* Send the current value to the user and return if no new value. */
 307         error = sysctl_handle_int(oidp, &arg, 0, req);
 308         if (error != 0 || req->newptr == NULL)
 309                 goto out;
 310
 311         /* Set the new value via the appropriate function. */
 312         error = handler(sc->handle, HCI_SET, &arg);
 313
 314 out:
 315         ACPI_SERIAL_END(toshiba);
 316         return (error);
 317 }
 318
 319 static int
 320 hci_force_fan(ACPI_HANDLE h, int op, UINT32 *state)
 321 {
 322         int             ret;
 323
 324         ACPI_SERIAL_ASSERT(toshiba);
 325         if (op == HCI_SET) {
 326                 if (*state > 1)
 327                         return (EINVAL);
 328                 *state <<= HCI_FAN_SHIFT;
 329         }
 330         ret = hci_call(h, op, HCI_REG_FAN, state);
 331         if (ret == 0 && op == HCI_GET)
 332                 *state >>= HCI_FAN_SHIFT;
 333         return (ret);
 334 }
 335
 336 static int
 337 hci_video_output(ACPI_HANDLE h, int op, UINT32 *video_output)
 338 {
 339         int             ret;
 340         ACPI_STATUS     status;
 341
 342         ACPI_SERIAL_ASSERT(toshiba);
 343         if (op == HCI_SET) {
 344                 if (*video_output < 1 || *video_output > 7)
 345                         return (EINVAL);
 346                 if (h == NULL)
 347                         return (ENXIO);
 348                 *video_output |= HCI_VIDEO_OUTPUT_FLAG;
 349                 status = acpi_SetInteger(h, METHOD_VIDEO, *video_output);
 350                 if (ACPI_SUCCESS(status))
 351                         ret = 0;
 352                 else
 353                         ret = ENXIO;
 354         } else {
 355                 ret = hci_call(h, op, HCI_REG_VIDEO_OUTPUT, video_output);
 356                 if (ret == 0)
 357                         *video_output &= 0xff;
 358         }
 359
 360         return (ret);
 361 }
 362
 363 static int
 364 hci_lcd_brightness(ACPI_HANDLE h, int op, UINT32 *brightness)
 365 {
 366         int             ret;
 367
 368         ACPI_SERIAL_ASSERT(toshiba);
 369         if (op == HCI_SET) {
 370                 if (*brightness > HCI_LCD_BRIGHTNESS_MAX)
 371                         return (EINVAL);
 372                 *brightness <<= HCI_LCD_BRIGHTNESS_SHIFT;
 373         }
 374         ret = hci_call(h, op, HCI_REG_LCD_BRIGHTNESS, brightness);
 375         if (ret == 0 && op == HCI_GET)
 376                 *brightness >>= HCI_LCD_BRIGHTNESS_SHIFT;
 377         return (ret);
 378 }
 379
 380 static int
 381 hci_lcd_backlight(ACPI_HANDLE h, int op, UINT32 *backlight)
 382 {
 383
 384         ACPI_SERIAL_ASSERT(toshiba);
 385         if (op == HCI_SET) {
 386                 if (*backlight > 1)
 387                         return (EINVAL);
 388         }
 389         return (hci_call(h, op, HCI_REG_LCD_BACKLIGHT, backlight));
 390 }
 391
 392 static int
 393 hci_cpu_speed(ACPI_HANDLE h, int op, UINT32 *speed)
 394 {
 395         int             ret;
 396
 397         ACPI_SERIAL_ASSERT(toshiba);
 398         if (op == HCI_SET) {
 399                 if (*speed > HCI_CPU_SPEED_MAX)
 400                         return (EINVAL);
 401                 *speed <<= HCI_CPU_SPEED_SHIFT;
 402         }
 403         ret = hci_call(h, op, HCI_REG_CPU_SPEED, speed);
 404         if (ret == 0 && op == HCI_GET)
 405                 *speed >>= HCI_CPU_SPEED_SHIFT;
 406         return (ret);
 407 }
 408
 409 static int
 410 hci_call(ACPI_HANDLE h, int op, int function, UINT32 *arg)
 411 {
 412         ACPI_OBJECT_LIST args;
 413         ACPI_BUFFER     results;
 414         ACPI_OBJECT     obj[HCI_WORDS];
 415         ACPI_OBJECT     *res;
 416         int             status, i, ret;
 417
 418         ACPI_SERIAL_ASSERT(toshiba);
 419         status = ENXIO;
 420
 421         for (i = 0; i < HCI_WORDS; i++) {
 422                 obj[i].Type = ACPI_TYPE_INTEGER;
 423                 obj[i].Integer.Value = 0;
 424         }
 425         obj[HCI_REG_AX].Integer.Value = op;
 426         obj[HCI_REG_BX].Integer.Value = function;
 427         if (op == HCI_SET)
 428                 obj[HCI_REG_CX].Integer.Value = *arg;
 429
 430         args.Count = HCI_WORDS;
 431         args.Pointer = obj;
 432         results.Pointer = NULL;
 433         results.Length = ACPI_ALLOCATE_BUFFER;
 434         if (ACPI_FAILURE(AcpiEvaluateObject(h, METHOD_HCI, &args, &results)))
 435                 goto end;
 436         res = (ACPI_OBJECT *)results.Pointer;
 437         if (!ACPI_PKG_VALID(res, HCI_WORDS)) {
 438                 kprintf("toshiba: invalid package!\n");
 439                 return (ENXIO);
 440         }
 441
 442         acpi_PkgInt32(res, HCI_REG_AX, &ret);
 443         if (ret == HCI_SUCCESS) {
 444                 if (op == HCI_GET)
 445                         acpi_PkgInt32(res, HCI_REG_CX, arg);
 446                 status = 0;
 447         } else if (function == HCI_REG_SYSTEM_EVENT && op == HCI_GET &&
 448             ret == HCI_NOT_SUPPORTED) {
 449                 /*
 450                  * Sometimes system events are disabled without us requesting
 451                  * it.  This workaround attempts to re-enable them.
 452                  *
 453                  * XXX This call probably shouldn't be recursive.  Queueing
 454                  * a task via AcpiOsQueueForExecution() might be better.
 455                  */
 456                  i = 1;
 457                  hci_call(h, HCI_SET, HCI_REG_SYSTEM_EVENT, &i);
 458         }
 459
 460 end:
 461         if (results.Pointer != NULL)
 462                 AcpiOsFree(results.Pointer);
 463
 464         return (status);
 465 }
 466
 467 /*
 468  * Perform a few actions based on the keypress.  Users can extend this
 469  * functionality by reading the keystrokes we send to devd(8).
 470  */
 471 static void
 472 hci_key_action(struct acpi_toshiba_softc *sc, ACPI_HANDLE h, UINT32 key)
 473 {
 474         UINT32          arg;
 475
 476         ACPI_SERIAL_ASSERT(toshiba);
 477         switch (key) {
 478         case FN_F6_RELEASE:
 479                 /* Decrease LCD brightness. */
 480                 hci_lcd_brightness(h, HCI_GET, &arg);
 481                 if (arg-- == 0)
 482                         arg = 0;
 483                 else
 484                         hci_lcd_brightness(h, HCI_SET, &arg);
 485                 break;
 486         case FN_F7_RELEASE:
 487                 /* Increase LCD brightness. */
 488                 hci_lcd_brightness(h, HCI_GET, &arg);
 489                 if (arg++ == 7)
 490                         arg = 7;
 491                 else
 492                         hci_lcd_brightness(h, HCI_SET, &arg);
 493                 break;
 494         case FN_F5_RELEASE:
 495                 /* Cycle through video outputs. */
 496                 hci_video_output(h, HCI_GET, &arg);
 497                 arg = (arg + 1) % 7;
 498                 hci_video_output(sc->video_handle, HCI_SET, &arg);
 499                 break;
 500         case FN_F8_RELEASE:
 501                 /* Toggle LCD backlight. */
 502                 hci_lcd_backlight(h, HCI_GET, &arg);
 503                 arg = (arg != 0) ? 0 : 1;
 504                 hci_lcd_backlight(h, HCI_SET, &arg);
 505                 break;
 506         case FN_ESC_RELEASE:
 507                 /* Toggle forcing fan on. */
 508                 hci_force_fan(h, HCI_GET, &arg);
 509                 arg = (arg != 0) ? 0 : 1;
 510                 hci_force_fan(h, HCI_SET, &arg);
 511                 break;
 512         }
 513 }
 514
 515 static void
 516 acpi_toshiba_notify(ACPI_HANDLE h, UINT32 notify, void *context)
 517 {
 518         struct          acpi_toshiba_softc *sc;
 519         UINT32          key;
 520
 521         sc = (struct acpi_toshiba_softc *)context;
 522
 523         if (notify == 0x80) {
 524                 ACPI_SERIAL_BEGIN(toshiba);
 525                 while (hci_call(h, HCI_GET, HCI_REG_SYSTEM_EVENT, &key) == 0) {
 526                         hci_key_action(sc, h, key);
 527                         acpi_UserNotify("TOSHIBA", h, (uint8_t)key);
 528                 }
 529                 ACPI_SERIAL_END(toshiba);
 530         } else {
 531                 device_printf(sc->dev, "unknown notify: %#x\n", notify);
 532         }
 533 }
 534
 535 /*
 536  * Toshiba video pseudo-device to provide the DSSX method.
 537  *
 538  * HID      Model
 539  * -------------------------------------
 540  * TOS6201  Libretto L Series
 541  */
 542 static int
 543 acpi_toshiba_video_probe(device_t dev)
 544 {
 545         static char *vid_ids[] = { "TOS6201", NULL };
 546
 547         if (acpi_disabled("toshiba") ||
 548             ACPI_ID_PROBE(device_get_parent(dev), dev, vid_ids) == NULL ||
 549             device_get_unit(dev) != 0)
 550                 return (ENXIO);
 551
 552         device_quiet(dev);
 553         device_set_desc(dev, "Toshiba Video");
 554         return (0);
 555 }
 556
 557 static int
 558 acpi_toshiba_video_attach(device_t dev)
 559 {
 560         struct          acpi_toshiba_softc *sc;
 561
 562         sc = devclass_get_softc(acpi_toshiba_devclass, 0);
 563         if (sc == NULL)
 564                 return (ENXIO);
 565         sc->video_handle = acpi_get_handle(dev);
 566         return (0);
 567 }