err.no 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 - 2006, 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         return_ACPI_STATUS(AE_OK);
 239 }
 240
 241 ACPI_EXPORT_SYMBOL(acpi_enter_sleep_state_prep)
 242
 243 /*******************************************************************************
 244  *
 245  * FUNCTION:    acpi_enter_sleep_state
 246  *
 247  * PARAMETERS:  sleep_state         - Which sleep state to enter
 248  *
 249  * RETURN:      Status
 250  *
 251  * DESCRIPTION: Enter a system sleep state (see ACPI 2.0 spec p 231)
 252  *              THIS FUNCTION MUST BE CALLED WITH INTERRUPTS DISABLED
 253  *
 254  ******************************************************************************/
 255 acpi_status asmlinkage acpi_enter_sleep_state(u8 sleep_state)
 256 {
 257         u32 PM1Acontrol;
 258         u32 PM1Bcontrol;
 259         struct acpi_bit_register_info *sleep_type_reg_info;
 260         struct acpi_bit_register_info *sleep_enable_reg_info;
 261         u32 in_value;
 262         acpi_status status;
 263
 264         ACPI_FUNCTION_TRACE(acpi_enter_sleep_state);
 265
 266         if ((acpi_gbl_sleep_type_a > ACPI_SLEEP_TYPE_MAX) ||
 267             (acpi_gbl_sleep_type_b > ACPI_SLEEP_TYPE_MAX)) {
 268                 ACPI_ERROR((AE_INFO, "Sleep values out of range: A=%X B=%X",
 269                             acpi_gbl_sleep_type_a, acpi_gbl_sleep_type_b));
 270                 return_ACPI_STATUS(AE_AML_OPERAND_VALUE);
 271         }
 272
 273         sleep_type_reg_info =
 274             acpi_hw_get_bit_register_info(ACPI_BITREG_SLEEP_TYPE_A);
 275         sleep_enable_reg_info =
 276             acpi_hw_get_bit_register_info(ACPI_BITREG_SLEEP_ENABLE);
 277
 278         /* Clear wake status */
 279
 280         status =
 281             acpi_set_register(ACPI_BITREG_WAKE_STATUS, 1, ACPI_MTX_DO_NOT_LOCK);
 282         if (ACPI_FAILURE(status)) {
 283                 return_ACPI_STATUS(status);
 284         }
 285
 286         /* Clear all fixed and general purpose status bits */
 287
 288         status = acpi_hw_clear_acpi_status(ACPI_MTX_DO_NOT_LOCK);
 289         if (ACPI_FAILURE(status)) {
 290                 return_ACPI_STATUS(status);
 291         }
 292
 293         /*
 294          * 1) Disable/Clear all GPEs
 295          * 2) Enable all wakeup GPEs
 296          */
 297         status = acpi_hw_disable_all_gpes();
 298         if (ACPI_FAILURE(status)) {
 299                 return_ACPI_STATUS(status);
 300         }
 301         acpi_gbl_system_awake_and_running = FALSE;
 302
 303         status = acpi_hw_enable_all_wakeup_gpes();
 304         if (ACPI_FAILURE(status)) {
 305                 return_ACPI_STATUS(status);
 306         }
 307
 308         /* Get current value of PM1A control */
 309
 310         status = acpi_hw_register_read(ACPI_MTX_DO_NOT_LOCK,
 311                                        ACPI_REGISTER_PM1_CONTROL, &PM1Acontrol);
 312         if (ACPI_FAILURE(status)) {
 313                 return_ACPI_STATUS(status);
 314         }
 315         ACPI_DEBUG_PRINT((ACPI_DB_INIT,
 316                           "Entering sleep state [S%d]\n", sleep_state));
 317
 318         /* Clear SLP_EN and SLP_TYP fields */
 319
 320         PM1Acontrol &= ~(sleep_type_reg_info->access_bit_mask |
 321                          sleep_enable_reg_info->access_bit_mask);
 322         PM1Bcontrol = PM1Acontrol;
 323
 324         /* Insert SLP_TYP bits */
 325
 326         PM1Acontrol |=
 327             (acpi_gbl_sleep_type_a << sleep_type_reg_info->bit_position);
 328         PM1Bcontrol |=
 329             (acpi_gbl_sleep_type_b << sleep_type_reg_info->bit_position);
 330
 331         /*
 332          * We split the writes of SLP_TYP and SLP_EN to workaround
 333          * poorly implemented hardware.
 334          */
 335
 336         /* Write #1: fill in SLP_TYP data */
 337
 338         status = acpi_hw_register_write(ACPI_MTX_DO_NOT_LOCK,
 339                                         ACPI_REGISTER_PM1A_CONTROL,
 340                                         PM1Acontrol);
 341         if (ACPI_FAILURE(status)) {
 342                 return_ACPI_STATUS(status);
 343         }
 344
 345         status = acpi_hw_register_write(ACPI_MTX_DO_NOT_LOCK,
 346                                         ACPI_REGISTER_PM1B_CONTROL,
 347                                         PM1Bcontrol);
 348         if (ACPI_FAILURE(status)) {
 349                 return_ACPI_STATUS(status);
 350         }
 351
 352         /* Insert SLP_ENABLE bit */
 353
 354         PM1Acontrol |= sleep_enable_reg_info->access_bit_mask;
 355         PM1Bcontrol |= sleep_enable_reg_info->access_bit_mask;
 356
 357         /* Write #2: SLP_TYP + SLP_EN */
 358
 359         ACPI_FLUSH_CPU_CACHE();
 360
 361         status = acpi_hw_register_write(ACPI_MTX_DO_NOT_LOCK,
 362                                         ACPI_REGISTER_PM1A_CONTROL,
 363                                         PM1Acontrol);
 364         if (ACPI_FAILURE(status)) {
 365                 return_ACPI_STATUS(status);
 366         }
 367
 368         status = acpi_hw_register_write(ACPI_MTX_DO_NOT_LOCK,
 369                                         ACPI_REGISTER_PM1B_CONTROL,
 370                                         PM1Bcontrol);
 371         if (ACPI_FAILURE(status)) {
 372                 return_ACPI_STATUS(status);
 373         }
 374
 375         if (sleep_state > ACPI_STATE_S3) {
 376                 /*
 377                  * We wanted to sleep > S3, but it didn't happen (by virtue of the
 378                  * fact that we are still executing!)
 379                  *
 380                  * Wait ten seconds, then try again. This is to get S4/S5 to work on
 381                  * all machines.
 382                  *
 383                  * We wait so long to allow chipsets that poll this reg very slowly to
 384                  * still read the right value. Ideally, this block would go
 385                  * away entirely.
 386                  */
 387                 acpi_os_stall(10000000);
 388
 389                 status = acpi_hw_register_write(ACPI_MTX_DO_NOT_LOCK,
 390                                                 ACPI_REGISTER_PM1_CONTROL,
 391                                                 sleep_enable_reg_info->
 392                                                 access_bit_mask);
 393                 if (ACPI_FAILURE(status)) {
 394                         return_ACPI_STATUS(status);
 395                 }
 396         }
 397
 398         /* Wait until we enter sleep state */
 399
 400         do {
 401                 status = acpi_get_register(ACPI_BITREG_WAKE_STATUS, &in_value,
 402                                            ACPI_MTX_DO_NOT_LOCK);
 403                 if (ACPI_FAILURE(status)) {
 404                         return_ACPI_STATUS(status);
 405                 }
 406
 407                 /* Spin until we wake */
 408
 409         } while (!in_value);
 410
 411         return_ACPI_STATUS(AE_OK);
 412 }
 413
 414 ACPI_EXPORT_SYMBOL(acpi_enter_sleep_state)
 415
 416 /*******************************************************************************
 417  *
 418  * FUNCTION:    acpi_enter_sleep_state_s4bios
 419  *
 420  * PARAMETERS:  None
 421  *
 422  * RETURN:      Status
 423  *
 424  * DESCRIPTION: Perform a S4 bios request.
 425  *              THIS FUNCTION MUST BE CALLED WITH INTERRUPTS DISABLED
 426  *
 427  ******************************************************************************/
 428 acpi_status asmlinkage acpi_enter_sleep_state_s4bios(void)
 429 {
 430         u32 in_value;
 431         acpi_status status;
 432
 433         ACPI_FUNCTION_TRACE(acpi_enter_sleep_state_s4bios);
 434
 435         status =
 436             acpi_set_register(ACPI_BITREG_WAKE_STATUS, 1, ACPI_MTX_DO_NOT_LOCK);
 437         if (ACPI_FAILURE(status)) {
 438                 return_ACPI_STATUS(status);
 439         }
 440
 441         status = acpi_hw_clear_acpi_status(ACPI_MTX_DO_NOT_LOCK);
 442         if (ACPI_FAILURE(status)) {
 443                 return_ACPI_STATUS(status);
 444         }
 445
 446         /*
 447          * 1) Disable/Clear all GPEs
 448          * 2) Enable all wakeup GPEs
 449          */
 450         status = acpi_hw_disable_all_gpes();
 451         if (ACPI_FAILURE(status)) {
 452                 return_ACPI_STATUS(status);
 453         }
 454         acpi_gbl_system_awake_and_running = FALSE;
 455
 456         status = acpi_hw_enable_all_wakeup_gpes();
 457         if (ACPI_FAILURE(status)) {
 458                 return_ACPI_STATUS(status);
 459         }
 460
 461         ACPI_FLUSH_CPU_CACHE();
 462
 463         status = acpi_os_write_port(acpi_gbl_FADT.smi_command,
 464                                     (u32) acpi_gbl_FADT.S4bios_request, 8);
 465
 466         do {
 467                 acpi_os_stall(1000);
 468                 status = acpi_get_register(ACPI_BITREG_WAKE_STATUS, &in_value,
 469                                            ACPI_MTX_DO_NOT_LOCK);
 470                 if (ACPI_FAILURE(status)) {
 471                         return_ACPI_STATUS(status);
 472                 }
 473         } while (!in_value);
 474
 475         return_ACPI_STATUS(AE_OK);
 476 }
 477
 478 ACPI_EXPORT_SYMBOL(acpi_enter_sleep_state_s4bios)
 479
 480 /*******************************************************************************
 481  *
 482  * FUNCTION:    acpi_leave_sleep_state
 483  *
 484  * PARAMETERS:  sleep_state         - Which sleep state we just exited
 485  *
 486  * RETURN:      Status
 487  *
 488  * DESCRIPTION: Perform OS-independent ACPI cleanup after a sleep
 489  *              Called with interrupts ENABLED.
 490  *
 491  ******************************************************************************/
 492 acpi_status acpi_leave_sleep_state(u8 sleep_state)
 493 {
 494         struct acpi_object_list arg_list;
 495         union acpi_object arg;
 496         acpi_status status;
 497         struct acpi_bit_register_info *sleep_type_reg_info;
 498         struct acpi_bit_register_info *sleep_enable_reg_info;
 499         u32 PM1Acontrol;
 500         u32 PM1Bcontrol;
 501
 502         ACPI_FUNCTION_TRACE(acpi_leave_sleep_state);
 503
 504         /*
 505          * Set SLP_TYPE and SLP_EN to state S0.
 506          * This is unclear from the ACPI Spec, but it is required
 507          * by some machines.
 508          */
 509         status = acpi_get_sleep_type_data(ACPI_STATE_S0,
 510                                           &acpi_gbl_sleep_type_a,
 511                                           &acpi_gbl_sleep_type_b);
 512         if (ACPI_SUCCESS(status)) {
 513                 sleep_type_reg_info =
 514                     acpi_hw_get_bit_register_info(ACPI_BITREG_SLEEP_TYPE_A);
 515                 sleep_enable_reg_info =
 516                     acpi_hw_get_bit_register_info(ACPI_BITREG_SLEEP_ENABLE);
 517
 518                 /* Get current value of PM1A control */
 519
 520                 status = acpi_hw_register_read(ACPI_MTX_DO_NOT_LOCK,
 521                                                ACPI_REGISTER_PM1_CONTROL,
 522                                                &PM1Acontrol);
 523                 if (ACPI_SUCCESS(status)) {
 524
 525                         /* Clear SLP_EN and SLP_TYP fields */
 526
 527                         PM1Acontrol &= ~(sleep_type_reg_info->access_bit_mask |
 528                                          sleep_enable_reg_info->
 529                                          access_bit_mask);
 530                         PM1Bcontrol = PM1Acontrol;
 531
 532                         /* Insert SLP_TYP bits */
 533
 534                         PM1Acontrol |=
 535                             (acpi_gbl_sleep_type_a << sleep_type_reg_info->
 536                              bit_position);
 537                         PM1Bcontrol |=
 538                             (acpi_gbl_sleep_type_b << sleep_type_reg_info->
 539                              bit_position);
 540
 541                         /* Just ignore any errors */
 542
 543                         (void)acpi_hw_register_write(ACPI_MTX_DO_NOT_LOCK,
 544                                                      ACPI_REGISTER_PM1A_CONTROL,
 545                                                      PM1Acontrol);
 546                         (void)acpi_hw_register_write(ACPI_MTX_DO_NOT_LOCK,
 547                                                      ACPI_REGISTER_PM1B_CONTROL,
 548                                                      PM1Bcontrol);
 549                 }
 550         }
 551
 552         /* Ensure enter_sleep_state_prep -> enter_sleep_state ordering */
 553
 554         acpi_gbl_sleep_type_a = ACPI_SLEEP_TYPE_INVALID;
 555
 556         /* Setup parameter object */
 557
 558         arg_list.count = 1;
 559         arg_list.pointer = &arg;
 560         arg.type = ACPI_TYPE_INTEGER;
 561
 562         /* Ignore any errors from these methods */
 563
 564         arg.integer.value = ACPI_SST_WAKING;
 565         status = acpi_evaluate_object(NULL, METHOD_NAME__SST, &arg_list, NULL);
 566         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
 567                 ACPI_EXCEPTION((AE_INFO, status, "During Method _SST"));
 568         }
 569
 570         arg.integer.value = sleep_state;
 571         status = acpi_evaluate_object(NULL, METHOD_NAME__BFS, &arg_list, NULL);
 572         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
 573                 ACPI_EXCEPTION((AE_INFO, status, "During Method _BFS"));
 574         }
 575
 576         status = acpi_evaluate_object(NULL, METHOD_NAME__WAK, &arg_list, NULL);
 577         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
 578                 ACPI_EXCEPTION((AE_INFO, status, "During Method _WAK"));
 579         }
 580         /* TBD: _WAK "sometimes" returns stuff - do we want to look at it? */
 581
 582         /*
 583          * Restore the GPEs:
 584          * 1) Disable/Clear all GPEs
 585          * 2) Enable all runtime GPEs
 586          */
 587         status = acpi_hw_disable_all_gpes();
 588         if (ACPI_FAILURE(status)) {
 589                 return_ACPI_STATUS(status);
 590         }
 591         acpi_gbl_system_awake_and_running = TRUE;
 592
 593         status = acpi_hw_enable_all_runtime_gpes();
 594         if (ACPI_FAILURE(status)) {
 595                 return_ACPI_STATUS(status);
 596         }
 597
 598         /* Enable power button */
 599
 600         (void)
 601             acpi_set_register(acpi_gbl_fixed_event_info
 602                               [ACPI_EVENT_POWER_BUTTON].enable_register_id, 1,
 603                               ACPI_MTX_DO_NOT_LOCK);
 604
 605         (void)
 606             acpi_set_register(acpi_gbl_fixed_event_info
 607                               [ACPI_EVENT_POWER_BUTTON].status_register_id, 1,
 608                               ACPI_MTX_DO_NOT_LOCK);
 609
 610         arg.integer.value = ACPI_SST_WORKING;
 611         status = acpi_evaluate_object(NULL, METHOD_NAME__SST, &arg_list, NULL);
 612         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
 613                 ACPI_EXCEPTION((AE_INFO, status, "During Method _SST"));
 614         }
 615
 616         return_ACPI_STATUS(status);
 617 }
 618
 619 ACPI_EXPORT_SYMBOL(acpi_leave_sleep_state)