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     0, 0);
 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, 0, 0);
 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
 243         acpi_sc = acpi_device_get_parent_softc(dev);
 244         sysctl_ctx_init(&sc->sysctl_ctx);
 245         sc->sysctl_tree = SYSCTL_ADD_NODE(&sc->sysctl_ctx,
 246             SYSCTL_CHILDREN(acpi_sc->acpi_sysctl_tree), OID_AUTO,
 247             "toshiba", CTLFLAG_RD, 0, "");
 248
 249         for (i = 0; sysctl_table[i].name != NULL; i++) {
 250                 SYSCTL_ADD_PROC(&sc->sysctl_ctx,
 251                     SYSCTL_CHILDREN(sc->sysctl_tree), OID_AUTO,
 252                     sysctl_table[i].name,
 253                     CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_ANYBODY,
 254                     sc, i, acpi_toshiba_sysctl, "I", "");
 255         }
 256
 257         if (enable_fn_keys != 0) {
 258                 status = AcpiEvaluateObject(sc->handle, METHOD_HCI_ENABLE,
 259                                             NULL, NULL);
 260                 if (ACPI_FAILURE(status)) {
 261                         device_printf(dev, "enable FN keys failed\n");
 262                         sysctl_ctx_free(&sc->sysctl_ctx);
 263                         return (ENXIO);
 264                 }
 265                 AcpiInstallNotifyHandler(sc->handle, ACPI_DEVICE_NOTIFY,
 266                                          acpi_toshiba_notify, sc);
 267         }
 268
 269         return (0);
 270 }
 271
 272 static int
 273 acpi_toshiba_detach(device_t dev)
 274 {
 275         struct          acpi_toshiba_softc *sc;
 276
 277         sc = device_get_softc(dev);
 278         if (enable_fn_keys != 0) {
 279                 AcpiRemoveNotifyHandler(sc->handle, ACPI_DEVICE_NOTIFY,
 280                                         acpi_toshiba_notify);
 281         }
 282         sysctl_ctx_free(&sc->sysctl_ctx);
 283
 284         return (0);
 285 }
 286
 287 static int
 288 acpi_toshiba_sysctl(SYSCTL_HANDLER_ARGS)
 289 {
 290         struct          acpi_toshiba_softc *sc;
 291         UINT32          arg;
 292         int             function, error = 0;
 293         hci_fn_t        *handler;
 294
 295         sc = (struct acpi_toshiba_softc *)oidp->oid_arg1;
 296         function = oidp->oid_arg2;
 297         handler = sysctl_table[function].handler;
 298
 299         /* Get the current value from the appropriate function. */
 300         ACPI_SERIAL_BEGIN(toshiba);
 301         error = handler(sc->handle, HCI_GET, &arg);
 302         if (error != 0)
 303                 goto out;
 304
 305         /* Send the current value to the user and return if no new value. */
 306         error = sysctl_handle_int(oidp, &arg, 0, req);
 307         if (error != 0 || req->newptr == NULL)
 308                 goto out;
 309
 310         /* Set the new value via the appropriate function. */
 311         error = handler(sc->handle, HCI_SET, &arg);
 312
 313 out:
 314         ACPI_SERIAL_END(toshiba);
 315         return (error);
 316 }
 317
 318 static int
 319 hci_force_fan(ACPI_HANDLE h, int op, UINT32 *state)
 320 {
 321         int             ret;
 322
 323         ACPI_SERIAL_ASSERT(toshiba);
 324         if (op == HCI_SET) {
 325                 if (*state < 0 || *state > 1)
 326                         return (EINVAL);
 327                 *state <<= HCI_FAN_SHIFT;
 328         }
 329         ret = hci_call(h, op, HCI_REG_FAN, state);
 330         if (ret == 0 && op == HCI_GET)
 331                 *state >>= HCI_FAN_SHIFT;
 332         return (ret);
 333 }
 334
 335 static int
 336 hci_video_output(ACPI_HANDLE h, int op, UINT32 *video_output)
 337 {
 338         int             ret;
 339         ACPI_STATUS     status;
 340
 341         ACPI_SERIAL_ASSERT(toshiba);
 342         if (op == HCI_SET) {
 343                 if (*video_output < 1 || *video_output > 7)
 344                         return (EINVAL);
 345                 if (h == NULL)
 346                         return (ENXIO);
 347                 *video_output |= HCI_VIDEO_OUTPUT_FLAG;
 348                 status = acpi_SetInteger(h, METHOD_VIDEO, *video_output);
 349                 if (ACPI_SUCCESS(status))
 350                         ret = 0;
 351                 else
 352                         ret = ENXIO;
 353         } else {
 354                 ret = hci_call(h, op, HCI_REG_VIDEO_OUTPUT, video_output);
 355                 if (ret == 0)
 356                         *video_output &= 0xff;
 357         }
 358
 359         return (ret);
 360 }
 361
 362 static int
 363 hci_lcd_brightness(ACPI_HANDLE h, int op, UINT32 *brightness)
 364 {
 365         int             ret;
 366
 367         ACPI_SERIAL_ASSERT(toshiba);
 368         if (op == HCI_SET) {
 369                 if (*brightness < 0 || *brightness > HCI_LCD_BRIGHTNESS_MAX)
 370                         return (EINVAL);
 371                 *brightness <<= HCI_LCD_BRIGHTNESS_SHIFT;
 372         }
 373         ret = hci_call(h, op, HCI_REG_LCD_BRIGHTNESS, brightness);
 374         if (ret == 0 && op == HCI_GET)
 375                 *brightness >>= HCI_LCD_BRIGHTNESS_SHIFT;
 376         return (ret);
 377 }
 378
 379 static int
 380 hci_lcd_backlight(ACPI_HANDLE h, int op, UINT32 *backlight)
 381 {
 382
 383         ACPI_SERIAL_ASSERT(toshiba);
 384         if (op == HCI_SET) {
 385                 if (*backlight < 0 || *backlight > 1)
 386                         return (EINVAL);
 387         }
 388         return (hci_call(h, op, HCI_REG_LCD_BACKLIGHT, backlight));
 389 }
 390
 391 static int
 392 hci_cpu_speed(ACPI_HANDLE h, int op, UINT32 *speed)
 393 {
 394         int             ret;
 395
 396         ACPI_SERIAL_ASSERT(toshiba);
 397         if (op == HCI_SET) {
 398                 if (*speed < 0 || *speed > HCI_CPU_SPEED_MAX)
 399                         return (EINVAL);
 400                 *speed <<= HCI_CPU_SPEED_SHIFT;
 401         }
 402         ret = hci_call(h, op, HCI_REG_CPU_SPEED, speed);
 403         if (ret == 0 && op == HCI_GET)
 404                 *speed >>= HCI_CPU_SPEED_SHIFT;
 405         return (ret);
 406 }
 407
 408 static int
 409 hci_call(ACPI_HANDLE h, int op, int function, UINT32 *arg)
 410 {
 411         ACPI_OBJECT_LIST args;
 412         ACPI_BUFFER     results;
 413         ACPI_OBJECT     obj[HCI_WORDS];
 414         ACPI_OBJECT     *res;
 415         int             status, i, ret;
 416
 417         ACPI_SERIAL_ASSERT(toshiba);
 418         status = ENXIO;
 419
 420         for (i = 0; i < HCI_WORDS; i++) {
 421                 obj[i].Type = ACPI_TYPE_INTEGER;
 422                 obj[i].Integer.Value = 0;
 423         }
 424         obj[HCI_REG_AX].Integer.Value = op;
 425         obj[HCI_REG_BX].Integer.Value = function;
 426         if (op == HCI_SET)
 427                 obj[HCI_REG_CX].Integer.Value = *arg;
 428
 429         args.Count = HCI_WORDS;
 430         args.Pointer = obj;
 431         results.Pointer = NULL;
 432         results.Length = ACPI_ALLOCATE_BUFFER;
 433         if (ACPI_FAILURE(AcpiEvaluateObject(h, METHOD_HCI, &args, &results)))
 434                 goto end;
 435         res = (ACPI_OBJECT *)results.Pointer;
 436         if (!ACPI_PKG_VALID(res, HCI_WORDS)) {
 437                 kprintf("toshiba: invalid package!\n");
 438                 return (ENXIO);
 439         }
 440
 441         acpi_PkgInt32(res, HCI_REG_AX, &ret);
 442         if (ret == HCI_SUCCESS) {
 443                 if (op == HCI_GET)
 444                         acpi_PkgInt32(res, HCI_REG_CX, arg);
 445                 status = 0;
 446         } else if (function == HCI_REG_SYSTEM_EVENT && op == HCI_GET &&
 447             ret == HCI_NOT_SUPPORTED) {
 448                 /*
 449                  * Sometimes system events are disabled without us requesting
 450                  * it.  This workaround attempts to re-enable them.
 451                  *
 452                  * XXX This call probably shouldn't be recursive.  Queueing
 453                  * a task via AcpiOsQueueForExecution() might be better.
 454                  */
 455                  i = 1;
 456                  hci_call(h, HCI_SET, HCI_REG_SYSTEM_EVENT, &i);
 457         }
 458
 459 end:
 460         if (results.Pointer != NULL)
 461                 AcpiOsFree(results.Pointer);
 462
 463         return (status);
 464 }
 465
 466 /*
 467  * Perform a few actions based on the keypress.  Users can extend this
 468  * functionality by reading the keystrokes we send to devd(8).
 469  */
 470 static void
 471 hci_key_action(struct acpi_toshiba_softc *sc, ACPI_HANDLE h, UINT32 key)
 472 {
 473         UINT32          arg;
 474
 475         ACPI_SERIAL_ASSERT(toshiba);
 476         switch (key) {
 477         case FN_F6_RELEASE:
 478                 /* Decrease LCD brightness. */
 479                 hci_lcd_brightness(h, HCI_GET, &arg);
 480                 if (arg-- == 0)
 481                         arg = 0;
 482                 else
 483                         hci_lcd_brightness(h, HCI_SET, &arg);
 484                 break;
 485         case FN_F7_RELEASE:
 486                 /* Increase LCD brightness. */
 487                 hci_lcd_brightness(h, HCI_GET, &arg);
 488                 if (arg++ == 7)
 489                         arg = 7;
 490                 else
 491                         hci_lcd_brightness(h, HCI_SET, &arg);
 492                 break;
 493         case FN_F5_RELEASE:
 494                 /* Cycle through video outputs. */
 495                 hci_video_output(h, HCI_GET, &arg);
 496                 arg = (arg + 1) % 7;
 497                 hci_video_output(sc->video_handle, HCI_SET, &arg);
 498                 break;
 499         case FN_F8_RELEASE:
 500                 /* Toggle LCD backlight. */
 501                 hci_lcd_backlight(h, HCI_GET, &arg);
 502                 arg = (arg != 0) ? 0 : 1;
 503                 hci_lcd_backlight(h, HCI_SET, &arg);
 504                 break;
 505         case FN_ESC_RELEASE:
 506                 /* Toggle forcing fan on. */
 507                 hci_force_fan(h, HCI_GET, &arg);
 508                 arg = (arg != 0) ? 0 : 1;
 509                 hci_force_fan(h, HCI_SET, &arg);
 510                 break;
 511         }
 512 }
 513
 514 static void
 515 acpi_toshiba_notify(ACPI_HANDLE h, UINT32 notify, void *context)
 516 {
 517         struct          acpi_toshiba_softc *sc;
 518         UINT32          key;
 519
 520         sc = (struct acpi_toshiba_softc *)context;
 521
 522         if (notify == 0x80) {
 523                 ACPI_SERIAL_BEGIN(toshiba);
 524                 while (hci_call(h, HCI_GET, HCI_REG_SYSTEM_EVENT, &key) == 0) {
 525                         hci_key_action(sc, h, key);
 526                         acpi_UserNotify("TOSHIBA", h, (uint8_t)key);
 527                 }
 528                 ACPI_SERIAL_END(toshiba);
 529         } else
 530                 device_printf(sc->dev, "unknown notify: 0x%x\n", notify);
 531 }
 532
 533 /*
 534  * Toshiba video pseudo-device to provide the DSSX method.
 535  *
 536  * HID      Model
 537  * -------------------------------------
 538  * TOS6201  Libretto L Series
 539  */
 540 static int
 541 acpi_toshiba_video_probe(device_t dev)
 542 {
 543         static char *vid_ids[] = { "TOS6201", NULL };
 544
 545         if (acpi_disabled("toshiba") ||
 546             ACPI_ID_PROBE(device_get_parent(dev), dev, vid_ids) == NULL ||
 547             device_get_unit(dev) != 0)
 548                 return (ENXIO);
 549
 550         device_quiet(dev);
 551         device_set_desc(dev, "Toshiba Video");
 552         return (0);
 553 }
 554
 555 static int
 556 acpi_toshiba_video_attach(device_t dev)
 557 {
 558         struct          acpi_toshiba_softc *sc;
 559
 560         sc = devclass_get_softc(acpi_toshiba_devclass, 0);
 561         if (sc == NULL)
 562                 return (ENXIO);
 563         sc->video_handle = acpi_get_handle(dev);
 564         return (0);
 565 }