git.oblomov.eu Git - linux-2.6/blob - drivers/acpi/hardware/hwsleep.c

   1
   2 /******************************************************************************
   3  *
   4  * Name: hwsleep.c - ACPI Hardware Sleep/Wake Interface
   5  *
   6  *****************************************************************************/
   7
   8 /*
   9  * Copyright (C) 2000 - 2007, R. Byron Moore
  10  * All rights reserved.
  11  *
  12  * Redistribution and use in source and binary forms, with or without
  13  * modification, are permitted provided that the following conditions
  14  * are met:
  15  * 1. Redistributions of source code must retain the above copyright
  16  *    notice, this list of conditions, and the following disclaimer,
  17  *    without modification.
  18  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  19  *    substantially similar to the "NO WARRANTY" disclaimer below
  20  *    ("Disclaimer") and any redistribution must be conditioned upon
  21  *    including a substantially similar Disclaimer requirement for further
  22  *    binary redistribution.
  23  * 3. Neither the names of the above-listed copyright holders nor the names
  24  *    of any contributors may be used to endorse or promote products derived
  25  *    from this software without specific prior written permission.
  26  *
  27  * Alternatively, this software may be distributed under the terms of the
  28  * GNU General Public License ("GPL") version 2 as published by the Free
  29  * Software Foundation.
  30  *
  31  * NO WARRANTY
  32  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  33  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  34  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  35  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  36  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  37  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  38  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  39  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  40  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  41  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  42  * POSSIBILITY OF SUCH DAMAGES.
  43  */
  44
  45 #include <acpi/acpi.h>
  46 #include <acpi/actables.h>
  47
  48 #define _COMPONENT          ACPI_HARDWARE
  49 ACPI_MODULE_NAME("hwsleep")
  50
  51 /*******************************************************************************
  52  *
  53  * FUNCTION:    acpi_set_firmware_waking_vector
  54  *
  55  * PARAMETERS:  physical_address    - Physical address of ACPI real mode
  56  *                                    entry point.
  57  *
  58  * RETURN:      Status
  59  *
  60  * DESCRIPTION: Access function for the firmware_waking_vector field in FACS
  61  *
  62  ******************************************************************************/
  63 acpi_status
  64 acpi_set_firmware_waking_vector(acpi_physical_address physical_address)
  65 {
  66         struct acpi_table_facs *facs;
  67         acpi_status status;
  68
  69         ACPI_FUNCTION_TRACE(acpi_set_firmware_waking_vector);
  70
  71         /* Get the FACS */
  72
  73         status =
  74             acpi_get_table_by_index(ACPI_TABLE_INDEX_FACS,
  75                                     (struct acpi_table_header **)&facs);
  76         if (ACPI_FAILURE(status)) {
  77                 return_ACPI_STATUS(status);
  78         }
  79
  80         /* Set the vector */
  81
  82         if ((facs->length < 32) || (!(facs->xfirmware_waking_vector))) {
  83                 /*
  84                  * ACPI 1.0 FACS or short table or optional X_ field is zero
  85                  */
  86                 facs->firmware_waking_vector = (u32) physical_address;
  87         } else {
  88                 /*
  89                  * ACPI 2.0 FACS with valid X_ field
  90                  */
  91                 facs->xfirmware_waking_vector = physical_address;
  92         }
  93
  94         return_ACPI_STATUS(AE_OK);
  95 }
  96
  97 ACPI_EXPORT_SYMBOL(acpi_set_firmware_waking_vector)
  98
  99 /*******************************************************************************
 100  *
 101  * FUNCTION:    acpi_get_firmware_waking_vector
 102  *
 103  * PARAMETERS:  *physical_address   - Where the contents of
 104  *                                    the firmware_waking_vector field of
 105  *                                    the FACS will be returned.
 106  *
 107  * RETURN:      Status, vector
 108  *
 109  * DESCRIPTION: Access function for the firmware_waking_vector field in FACS
 110  *
 111  ******************************************************************************/
 112 #ifdef ACPI_FUTURE_USAGE
 113 acpi_status
 114 acpi_get_firmware_waking_vector(acpi_physical_address * physical_address)
 115 {
 116         struct acpi_table_facs *facs;
 117         acpi_status status;
 118
 119         ACPI_FUNCTION_TRACE(acpi_get_firmware_waking_vector);
 120
 121         if (!physical_address) {
 122                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 123         }
 124
 125         /* Get the FACS */
 126
 127         status =
 128             acpi_get_table_by_index(ACPI_TABLE_INDEX_FACS,
 129                                     (struct acpi_table_header **)&facs);
 130         if (ACPI_FAILURE(status)) {
 131                 return_ACPI_STATUS(status);
 132         }
 133
 134         /* Get the vector */
 135
 136         if ((facs->length < 32) || (!(facs->xfirmware_waking_vector))) {
 137                 /*
 138                  * ACPI 1.0 FACS or short table or optional X_ field is zero
 139                  */
 140                 *physical_address =
 141                     (acpi_physical_address) facs->firmware_waking_vector;
 142         } else {
 143                 /*
 144                  * ACPI 2.0 FACS with valid X_ field
 145                  */
 146                 *physical_address =
 147                     (acpi_physical_address) facs->xfirmware_waking_vector;
 148         }
 149
 150         return_ACPI_STATUS(AE_OK);
 151 }
 152
 153 ACPI_EXPORT_SYMBOL(acpi_get_firmware_waking_vector)
 154 #endif
 155
 156 /*******************************************************************************
 157  *
 158  * FUNCTION:    acpi_enter_sleep_state_prep
 159  *
 160  * PARAMETERS:  sleep_state         - Which sleep state to enter
 161  *
 162  * RETURN:      Status
 163  *
 164  * DESCRIPTION: Prepare to enter a system sleep state (see ACPI 2.0 spec p 231)
 165  *              This function must execute with interrupts enabled.
 166  *              We break sleeping into 2 stages so that OSPM can handle
 167  *              various OS-specific tasks between the two steps.
 168  *
 169  ******************************************************************************/
 170 acpi_status acpi_enter_sleep_state_prep(u8 sleep_state)
 171 {
 172         acpi_status status;
 173         struct acpi_object_list arg_list;
 174         union acpi_object arg;
 175
 176         ACPI_FUNCTION_TRACE(acpi_enter_sleep_state_prep);
 177
 178         /*
 179          * _PSW methods could be run here to enable wake-on keyboard, LAN, etc.
 180          */
 181         status = acpi_get_sleep_type_data(sleep_state,
 182                                           &acpi_gbl_sleep_type_a,
 183                                           &acpi_gbl_sleep_type_b);
 184         if (ACPI_FAILURE(status)) {
 185                 return_ACPI_STATUS(status);
 186         }
 187
 188         /* Setup parameter object */
 189
 190         arg_list.count = 1;
 191         arg_list.pointer = &arg;
 192
 193         arg.type = ACPI_TYPE_INTEGER;
 194         arg.integer.value = sleep_state;
 195
 196         /* Run the _PTS and _GTS methods */
 197
 198         status = acpi_evaluate_object(NULL, METHOD_NAME__PTS, &arg_list, NULL);
 199         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
 200                 return_ACPI_STATUS(status);
 201         }
 202
 203         status = acpi_evaluate_object(NULL, METHOD_NAME__GTS, &arg_list, NULL);
 204         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
 205                 return_ACPI_STATUS(status);
 206         }
 207
 208         /* Setup the argument to _SST */
 209
 210         switch (sleep_state) {
 211         case ACPI_STATE_S0:
 212                 arg.integer.value = ACPI_SST_WORKING;
 213                 break;
 214
 215         case ACPI_STATE_S1:
 216         case ACPI_STATE_S2:
 217         case ACPI_STATE_S3:
 218                 arg.integer.value = ACPI_SST_SLEEPING;
 219                 break;
 220
 221         case ACPI_STATE_S4:
 222                 arg.integer.value = ACPI_SST_SLEEP_CONTEXT;
 223                 break;
 224
 225         default:
 226                 arg.integer.value = ACPI_SST_INDICATOR_OFF;     /* Default is off */
 227                 break;
 228         }
 229
 230         /* Set the system indicators to show the desired sleep state. */
 231
 232         status = acpi_evaluate_object(NULL, METHOD_NAME__SST, &arg_list, NULL);
 233         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
 234                 ACPI_EXCEPTION((AE_INFO, status,
 235                                 "While executing method _SST"));
 236         }
 237
 238         /*
 239          * 1) Disable/Clear all GPEs
 240          */
 241         status = acpi_hw_disable_all_gpes();
 242         if (ACPI_FAILURE(status)) {
 243                 return_ACPI_STATUS(status);
 244         }
 245
 246         return_ACPI_STATUS(AE_OK);
 247 }
 248
 249 ACPI_EXPORT_SYMBOL(acpi_enter_sleep_state_prep)
 250
 251 /*******************************************************************************
 252  *
 253  * FUNCTION:    acpi_enter_sleep_state
 254  *
 255  * PARAMETERS:  sleep_state         - Which sleep state to enter
 256  *
 257  * RETURN:      Status
 258  *
 259  * DESCRIPTION: Enter a system sleep state (see ACPI 2.0 spec p 231)
 260  *              THIS FUNCTION MUST BE CALLED WITH INTERRUPTS DISABLED
 261  *
 262  ******************************************************************************/
 263 acpi_status asmlinkage acpi_enter_sleep_state(u8 sleep_state)
 264 {
 265         u32 PM1Acontrol;
 266         u32 PM1Bcontrol;
 267         struct acpi_bit_register_info *sleep_type_reg_info;
 268         struct acpi_bit_register_info *sleep_enable_reg_info;
 269         u32 in_value;
 270         acpi_status status;
 271
 272         ACPI_FUNCTION_TRACE(acpi_enter_sleep_state);
 273
 274         if ((acpi_gbl_sleep_type_a > ACPI_SLEEP_TYPE_MAX) ||
 275             (acpi_gbl_sleep_type_b > ACPI_SLEEP_TYPE_MAX)) {
 276                 ACPI_ERROR((AE_INFO, "Sleep values out of range: A=%X B=%X",
 277                             acpi_gbl_sleep_type_a, acpi_gbl_sleep_type_b));
 278                 return_ACPI_STATUS(AE_AML_OPERAND_VALUE);
 279         }
 280
 281         sleep_type_reg_info =
 282             acpi_hw_get_bit_register_info(ACPI_BITREG_SLEEP_TYPE_A);
 283         sleep_enable_reg_info =
 284             acpi_hw_get_bit_register_info(ACPI_BITREG_SLEEP_ENABLE);
 285
 286         /* Clear wake status */
 287
 288         status = acpi_set_register(ACPI_BITREG_WAKE_STATUS, 1);
 289         if (ACPI_FAILURE(status)) {
 290                 return_ACPI_STATUS(status);
 291         }
 292
 293         /* Clear all fixed and general purpose status bits */
 294
 295         status = acpi_hw_clear_acpi_status();
 296         if (ACPI_FAILURE(status)) {
 297                 return_ACPI_STATUS(status);
 298         }
 299
 300         /*
 301          * 2) Enable all wakeup GPEs
 302          */
 303         status = acpi_hw_disable_all_gpes();
 304         if (ACPI_FAILURE(status)) {
 305                 return_ACPI_STATUS(status);
 306         }
 307
 308         acpi_gbl_system_awake_and_running = FALSE;
 309
 310         status = acpi_hw_enable_all_wakeup_gpes();
 311         if (ACPI_FAILURE(status)) {
 312                 return_ACPI_STATUS(status);
 313         }
 314
 315         /* Get current value of PM1A control */
 316
 317         status = acpi_hw_register_read(ACPI_MTX_DO_NOT_LOCK,
 318                                        ACPI_REGISTER_PM1_CONTROL, &PM1Acontrol);
 319         if (ACPI_FAILURE(status)) {
 320                 return_ACPI_STATUS(status);
 321         }
 322         ACPI_DEBUG_PRINT((ACPI_DB_INIT,
 323                           "Entering sleep state [S%d]\n", sleep_state));
 324
 325         /* Clear SLP_EN and SLP_TYP fields */
 326
 327         PM1Acontrol &= ~(sleep_type_reg_info->access_bit_mask |
 328                          sleep_enable_reg_info->access_bit_mask);
 329         PM1Bcontrol = PM1Acontrol;
 330
 331         /* Insert SLP_TYP bits */
 332
 333         PM1Acontrol |=
 334             (acpi_gbl_sleep_type_a << sleep_type_reg_info->bit_position);
 335         PM1Bcontrol |=
 336             (acpi_gbl_sleep_type_b << sleep_type_reg_info->bit_position);
 337
 338         /*
 339          * We split the writes of SLP_TYP and SLP_EN to workaround
 340          * poorly implemented hardware.
 341          */
 342
 343         /* Write #1: fill in SLP_TYP data */
 344
 345         status = acpi_hw_register_write(ACPI_MTX_DO_NOT_LOCK,
 346                                         ACPI_REGISTER_PM1A_CONTROL,
 347                                         PM1Acontrol);
 348         if (ACPI_FAILURE(status)) {
 349                 return_ACPI_STATUS(status);
 350         }
 351
 352         status = acpi_hw_register_write(ACPI_MTX_DO_NOT_LOCK,
 353                                         ACPI_REGISTER_PM1B_CONTROL,
 354                                         PM1Bcontrol);
 355         if (ACPI_FAILURE(status)) {
 356                 return_ACPI_STATUS(status);
 357         }
 358
 359         /* Insert SLP_ENABLE bit */
 360
 361         PM1Acontrol |= sleep_enable_reg_info->access_bit_mask;
 362         PM1Bcontrol |= sleep_enable_reg_info->access_bit_mask;
 363
 364         /* Write #2: SLP_TYP + SLP_EN */
 365
 366         ACPI_FLUSH_CPU_CACHE();
 367
 368         status = acpi_hw_register_write(ACPI_MTX_DO_NOT_LOCK,
 369                                         ACPI_REGISTER_PM1A_CONTROL,
 370                                         PM1Acontrol);
 371         if (ACPI_FAILURE(status)) {
 372                 return_ACPI_STATUS(status);
 373         }
 374
 375         status = acpi_hw_register_write(ACPI_MTX_DO_NOT_LOCK,
 376                                         ACPI_REGISTER_PM1B_CONTROL,
 377                                         PM1Bcontrol);
 378         if (ACPI_FAILURE(status)) {
 379                 return_ACPI_STATUS(status);
 380         }
 381
 382         if (sleep_state > ACPI_STATE_S3) {
 383                 /*
 384                  * We wanted to sleep > S3, but it didn't happen (by virtue of the
 385                  * fact that we are still executing!)
 386                  *
 387                  * Wait ten seconds, then try again. This is to get S4/S5 to work on
 388                  * all machines.
 389                  *
 390                  * We wait so long to allow chipsets that poll this reg very slowly to
 391                  * still read the right value. Ideally, this block would go
 392                  * away entirely.
 393                  */
 394                 acpi_os_stall(10000000);
 395
 396                 status = acpi_hw_register_write(ACPI_MTX_DO_NOT_LOCK,
 397                                                 ACPI_REGISTER_PM1_CONTROL,
 398                                                 sleep_enable_reg_info->
 399                                                 access_bit_mask);
 400                 if (ACPI_FAILURE(status)) {
 401                         return_ACPI_STATUS(status);
 402                 }
 403         }
 404
 405         /* Wait until we enter sleep state */
 406
 407         do {
 408                 status = acpi_get_register(ACPI_BITREG_WAKE_STATUS, &in_value);
 409                 if (ACPI_FAILURE(status)) {
 410                         return_ACPI_STATUS(status);
 411                 }
 412
 413                 /* Spin until we wake */
 414
 415         } while (!in_value);
 416
 417         return_ACPI_STATUS(AE_OK);
 418 }
 419
 420 ACPI_EXPORT_SYMBOL(acpi_enter_sleep_state)
 421
 422 /*******************************************************************************
 423  *
 424  * FUNCTION:    acpi_enter_sleep_state_s4bios
 425  *
 426  * PARAMETERS:  None
 427  *
 428  * RETURN:      Status
 429  *
 430  * DESCRIPTION: Perform a S4 bios request.
 431  *              THIS FUNCTION MUST BE CALLED WITH INTERRUPTS DISABLED
 432  *
 433  ******************************************************************************/
 434 acpi_status asmlinkage acpi_enter_sleep_state_s4bios(void)
 435 {
 436         u32 in_value;
 437         acpi_status status;
 438
 439         ACPI_FUNCTION_TRACE(acpi_enter_sleep_state_s4bios);
 440
 441         status = acpi_set_register(ACPI_BITREG_WAKE_STATUS, 1);
 442         if (ACPI_FAILURE(status)) {
 443                 return_ACPI_STATUS(status);
 444         }
 445
 446         status = acpi_hw_clear_acpi_status();
 447         if (ACPI_FAILURE(status)) {
 448                 return_ACPI_STATUS(status);
 449         }
 450
 451         /*
 452          * 1) Disable/Clear all GPEs
 453          * 2) Enable all wakeup GPEs
 454          */
 455         status = acpi_hw_disable_all_gpes();
 456         if (ACPI_FAILURE(status)) {
 457                 return_ACPI_STATUS(status);
 458         }
 459         acpi_gbl_system_awake_and_running = FALSE;
 460
 461         status = acpi_hw_enable_all_wakeup_gpes();
 462         if (ACPI_FAILURE(status)) {
 463                 return_ACPI_STATUS(status);
 464         }
 465
 466         ACPI_FLUSH_CPU_CACHE();
 467
 468         status = acpi_os_write_port(acpi_gbl_FADT.smi_command,
 469                                     (u32) acpi_gbl_FADT.S4bios_request, 8);
 470
 471         do {
 472                 acpi_os_stall(1000);
 473                 status = acpi_get_register(ACPI_BITREG_WAKE_STATUS, &in_value);
 474                 if (ACPI_FAILURE(status)) {
 475                         return_ACPI_STATUS(status);
 476                 }
 477         } while (!in_value);
 478
 479         return_ACPI_STATUS(AE_OK);
 480 }
 481
 482 ACPI_EXPORT_SYMBOL(acpi_enter_sleep_state_s4bios)
 483
 484 /*******************************************************************************
 485  *
 486  * FUNCTION:    acpi_leave_sleep_state
 487  *
 488  * PARAMETERS:  sleep_state         - Which sleep state we just exited
 489  *
 490  * RETURN:      Status
 491  *
 492  * DESCRIPTION: Perform OS-independent ACPI cleanup after a sleep
 493  *              Called with interrupts ENABLED.
 494  *
 495  ******************************************************************************/
 496 acpi_status acpi_leave_sleep_state(u8 sleep_state)
 497 {
 498         struct acpi_object_list arg_list;
 499         union acpi_object arg;
 500         acpi_status status;
 501         struct acpi_bit_register_info *sleep_type_reg_info;
 502         struct acpi_bit_register_info *sleep_enable_reg_info;
 503         u32 PM1Acontrol;
 504         u32 PM1Bcontrol;
 505
 506         ACPI_FUNCTION_TRACE(acpi_leave_sleep_state);
 507
 508         /*
 509          * Set SLP_TYPE and SLP_EN to state S0.
 510          * This is unclear from the ACPI Spec, but it is required
 511          * by some machines.
 512          */
 513         status = acpi_get_sleep_type_data(ACPI_STATE_S0,
 514                                           &acpi_gbl_sleep_type_a,
 515                                           &acpi_gbl_sleep_type_b);
 516         if (ACPI_SUCCESS(status)) {
 517                 sleep_type_reg_info =
 518                     acpi_hw_get_bit_register_info(ACPI_BITREG_SLEEP_TYPE_A);
 519                 sleep_enable_reg_info =
 520                     acpi_hw_get_bit_register_info(ACPI_BITREG_SLEEP_ENABLE);
 521
 522                 /* Get current value of PM1A control */
 523
 524                 status = acpi_hw_register_read(ACPI_MTX_DO_NOT_LOCK,
 525                                                ACPI_REGISTER_PM1_CONTROL,
 526                                                &PM1Acontrol);
 527                 if (ACPI_SUCCESS(status)) {
 528
 529                         /* Clear SLP_EN and SLP_TYP fields */
 530
 531                         PM1Acontrol &= ~(sleep_type_reg_info->access_bit_mask |
 532                                          sleep_enable_reg_info->
 533                                          access_bit_mask);
 534                         PM1Bcontrol = PM1Acontrol;
 535
 536                         /* Insert SLP_TYP bits */
 537
 538                         PM1Acontrol |=
 539                             (acpi_gbl_sleep_type_a << sleep_type_reg_info->
 540                              bit_position);
 541                         PM1Bcontrol |=
 542                             (acpi_gbl_sleep_type_b << sleep_type_reg_info->
 543                              bit_position);
 544
 545                         /* Just ignore any errors */
 546
 547                         (void)acpi_hw_register_write(ACPI_MTX_DO_NOT_LOCK,
 548                                                      ACPI_REGISTER_PM1A_CONTROL,
 549                                                      PM1Acontrol);
 550                         (void)acpi_hw_register_write(ACPI_MTX_DO_NOT_LOCK,
 551                                                      ACPI_REGISTER_PM1B_CONTROL,
 552                                                      PM1Bcontrol);
 553                 }
 554         }
 555
 556         /* Ensure enter_sleep_state_prep -> enter_sleep_state ordering */
 557
 558         acpi_gbl_sleep_type_a = ACPI_SLEEP_TYPE_INVALID;
 559
 560         /* Setup parameter object */
 561
 562         arg_list.count = 1;
 563         arg_list.pointer = &arg;
 564         arg.type = ACPI_TYPE_INTEGER;
 565
 566         /* Ignore any errors from these methods */
 567
 568         arg.integer.value = ACPI_SST_WAKING;
 569         status = acpi_evaluate_object(NULL, METHOD_NAME__SST, &arg_list, NULL);
 570         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
 571                 ACPI_EXCEPTION((AE_INFO, status, "During Method _SST"));
 572         }
 573
 574         arg.integer.value = sleep_state;
 575         status = acpi_evaluate_object(NULL, METHOD_NAME__BFS, &arg_list, NULL);
 576         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
 577                 ACPI_EXCEPTION((AE_INFO, status, "During Method _BFS"));
 578         }
 579
 580         status = acpi_evaluate_object(NULL, METHOD_NAME__WAK, &arg_list, NULL);
 581         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
 582                 ACPI_EXCEPTION((AE_INFO, status, "During Method _WAK"));
 583         }
 584         /* TBD: _WAK "sometimes" returns stuff - do we want to look at it? */
 585
 586         /*
 587          * Restore the GPEs:
 588          * 1) Disable/Clear all GPEs
 589          * 2) Enable all runtime GPEs
 590          */
 591         status = acpi_hw_disable_all_gpes();
 592         if (ACPI_FAILURE(status)) {
 593                 return_ACPI_STATUS(status);
 594         }
 595         acpi_gbl_system_awake_and_running = TRUE;
 596
 597         status = acpi_hw_enable_all_runtime_gpes();
 598         if (ACPI_FAILURE(status)) {
 599                 return_ACPI_STATUS(status);
 600         }
 601
 602         /* Enable power button */
 603
 604         (void)
 605             acpi_set_register(acpi_gbl_fixed_event_info
 606                               [ACPI_EVENT_POWER_BUTTON].enable_register_id, 1);
 607
 608         (void)
 609             acpi_set_register(acpi_gbl_fixed_event_info
 610                               [ACPI_EVENT_POWER_BUTTON].status_register_id, 1);
 611
 612         arg.integer.value = ACPI_SST_WORKING;
 613         status = acpi_evaluate_object(NULL, METHOD_NAME__SST, &arg_list, NULL);
 614         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
 615                 ACPI_EXCEPTION((AE_INFO, status, "During Method _SST"));
 616         }
 617
 618         return_ACPI_STATUS(status);
 619 }
 620
 621 ACPI_EXPORT_SYMBOL(acpi_leave_sleep_state)