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 - 2008, Intel Corp.
  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 = acpi_get_table_by_index(ACPI_TABLE_INDEX_FACS,
  74                                          ACPI_CAST_INDIRECT_PTR(struct
  75                                                                 acpi_table_header,
  76                                                                 &facs));
  77         if (ACPI_FAILURE(status)) {
  78                 return_ACPI_STATUS(status);
  79         }
  80
  81         /* Set the vector */
  82
  83         if ((facs->length < 32) || (!(facs->xfirmware_waking_vector))) {
  84                 /*
  85                  * ACPI 1.0 FACS or short table or optional X_ field is zero
  86                  */
  87                 facs->firmware_waking_vector = (u32) physical_address;
  88         } else {
  89                 /*
  90                  * ACPI 2.0 FACS with valid X_ field
  91                  */
  92                 facs->xfirmware_waking_vector = physical_address;
  93         }
  94
  95         return_ACPI_STATUS(AE_OK);
  96 }
  97
  98 ACPI_EXPORT_SYMBOL(acpi_set_firmware_waking_vector)
  99
 100 /*******************************************************************************
 101  *
 102  * FUNCTION:    acpi_get_firmware_waking_vector
 103  *
 104  * PARAMETERS:  *physical_address   - Where the contents of
 105  *                                    the firmware_waking_vector field of
 106  *                                    the FACS will be returned.
 107  *
 108  * RETURN:      Status, vector
 109  *
 110  * DESCRIPTION: Access function for the firmware_waking_vector field in FACS
 111  *
 112  ******************************************************************************/
 113 #ifdef ACPI_FUTURE_USAGE
 114 acpi_status
 115 acpi_get_firmware_waking_vector(acpi_physical_address * physical_address)
 116 {
 117         struct acpi_table_facs *facs;
 118         acpi_status status;
 119
 120         ACPI_FUNCTION_TRACE(acpi_get_firmware_waking_vector);
 121
 122         if (!physical_address) {
 123                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 124         }
 125
 126         /* Get the FACS */
 127
 128         status = acpi_get_table_by_index(ACPI_TABLE_INDEX_FACS,
 129                                          ACPI_CAST_INDIRECT_PTR(struct
 130                                                                 acpi_table_header,
 131                                                                 &facs));
 132         if (ACPI_FAILURE(status)) {
 133                 return_ACPI_STATUS(status);
 134         }
 135
 136         /* Get the vector */
 137
 138         if ((facs->length < 32) || (!(facs->xfirmware_waking_vector))) {
 139                 /*
 140                  * ACPI 1.0 FACS or short table or optional X_ field is zero
 141                  */
 142                 *physical_address =
 143                     (acpi_physical_address) facs->firmware_waking_vector;
 144         } else {
 145                 /*
 146                  * ACPI 2.0 FACS with valid X_ field
 147                  */
 148                 *physical_address =
 149                     (acpi_physical_address) facs->xfirmware_waking_vector;
 150         }
 151
 152         return_ACPI_STATUS(AE_OK);
 153 }
 154
 155 ACPI_EXPORT_SYMBOL(acpi_get_firmware_waking_vector)
 156 #endif
 157 /*******************************************************************************
 158  *
 159  * FUNCTION:    acpi_enter_sleep_state_prep
 160  *
 161  * PARAMETERS:  sleep_state         - Which sleep state to enter
 162  *
 163  * RETURN:      Status
 164  *
 165  * DESCRIPTION: Prepare to enter a system sleep state (see ACPI 2.0 spec p 231)
 166  *              This function must execute with interrupts enabled.
 167  *              We break sleeping into 2 stages so that OSPM can handle
 168  *              various OS-specific tasks between the two steps.
 169  *
 170  ******************************************************************************/
 171 acpi_status acpi_enter_sleep_state_prep(u8 sleep_state)
 172 {
 173         acpi_status status;
 174         struct acpi_object_list arg_list;
 175         union acpi_object arg;
 176
 177         ACPI_FUNCTION_TRACE(acpi_enter_sleep_state_prep);
 178
 179         /*
 180          * _PSW methods could be run here to enable wake-on keyboard, LAN, etc.
 181          */
 182         status = acpi_get_sleep_type_data(sleep_state,
 183                                           &acpi_gbl_sleep_type_a,
 184                                           &acpi_gbl_sleep_type_b);
 185         if (ACPI_FAILURE(status)) {
 186                 return_ACPI_STATUS(status);
 187         }
 188
 189         /* Setup parameter object */
 190
 191         arg_list.count = 1;
 192         arg_list.pointer = &arg;
 193
 194         arg.type = ACPI_TYPE_INTEGER;
 195         arg.integer.value = sleep_state;
 196
 197         /* Run the _PTS method */
 198
 199         status = acpi_evaluate_object(NULL, METHOD_NAME__PTS, &arg_list, NULL);
 200         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
 201                 return_ACPI_STATUS(status);
 202         }
 203
 204         /* Setup the argument to _SST */
 205
 206         switch (sleep_state) {
 207         case ACPI_STATE_S0:
 208                 arg.integer.value = ACPI_SST_WORKING;
 209                 break;
 210
 211         case ACPI_STATE_S1:
 212         case ACPI_STATE_S2:
 213         case ACPI_STATE_S3:
 214                 arg.integer.value = ACPI_SST_SLEEPING;
 215                 break;
 216
 217         case ACPI_STATE_S4:
 218                 arg.integer.value = ACPI_SST_SLEEP_CONTEXT;
 219                 break;
 220
 221         default:
 222                 arg.integer.value = ACPI_SST_INDICATOR_OFF;     /* Default is off */
 223                 break;
 224         }
 225
 226         /* Set the system indicators to show the desired sleep state. */
 227
 228         status = acpi_evaluate_object(NULL, METHOD_NAME__SST, &arg_list, NULL);
 229         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
 230                 ACPI_EXCEPTION((AE_INFO, status,
 231                                 "While executing method _SST"));
 232         }
 233
 234         return_ACPI_STATUS(status);
 235 }
 236
 237 ACPI_EXPORT_SYMBOL(acpi_enter_sleep_state_prep)
 238
 239 /*******************************************************************************
 240  *
 241  * FUNCTION:    acpi_enter_sleep_state
 242  *
 243  * PARAMETERS:  sleep_state         - Which sleep state to enter
 244  *
 245  * RETURN:      Status
 246  *
 247  * DESCRIPTION: Enter a system sleep state (see ACPI 2.0 spec p 231)
 248  *              THIS FUNCTION MUST BE CALLED WITH INTERRUPTS DISABLED
 249  *
 250  ******************************************************************************/
 251 acpi_status asmlinkage acpi_enter_sleep_state(u8 sleep_state)
 252 {
 253         u32 PM1Acontrol;
 254         u32 PM1Bcontrol;
 255         struct acpi_bit_register_info *sleep_type_reg_info;
 256         struct acpi_bit_register_info *sleep_enable_reg_info;
 257         u32 in_value;
 258         struct acpi_object_list arg_list;
 259         union acpi_object arg;
 260         acpi_status status;
 261
 262         ACPI_FUNCTION_TRACE(acpi_enter_sleep_state);
 263
 264         if ((acpi_gbl_sleep_type_a > ACPI_SLEEP_TYPE_MAX) ||
 265             (acpi_gbl_sleep_type_b > ACPI_SLEEP_TYPE_MAX)) {
 266                 ACPI_ERROR((AE_INFO, "Sleep values out of range: A=%X B=%X",
 267                             acpi_gbl_sleep_type_a, acpi_gbl_sleep_type_b));
 268                 return_ACPI_STATUS(AE_AML_OPERAND_VALUE);
 269         }
 270
 271         sleep_type_reg_info =
 272             acpi_hw_get_bit_register_info(ACPI_BITREG_SLEEP_TYPE_A);
 273         sleep_enable_reg_info =
 274             acpi_hw_get_bit_register_info(ACPI_BITREG_SLEEP_ENABLE);
 275
 276         /* Clear wake status */
 277
 278         status = acpi_set_register(ACPI_BITREG_WAKE_STATUS, 1);
 279         if (ACPI_FAILURE(status)) {
 280                 return_ACPI_STATUS(status);
 281         }
 282
 283         /* Clear all fixed and general purpose status bits */
 284
 285         status = acpi_hw_clear_acpi_status();
 286         if (ACPI_FAILURE(status)) {
 287                 return_ACPI_STATUS(status);
 288         }
 289
 290         /*
 291          * 1) Disable/Clear all GPEs
 292          * 2) Enable all wakeup GPEs
 293          */
 294         status = acpi_hw_disable_all_gpes();
 295         if (ACPI_FAILURE(status)) {
 296                 return_ACPI_STATUS(status);
 297         }
 298         acpi_gbl_system_awake_and_running = FALSE;
 299
 300         status = acpi_hw_enable_all_wakeup_gpes();
 301         if (ACPI_FAILURE(status)) {
 302                 return_ACPI_STATUS(status);
 303         }
 304
 305         /* Execute the _GTS method */
 306
 307         arg_list.count = 1;
 308         arg_list.pointer = &arg;
 309         arg.type = ACPI_TYPE_INTEGER;
 310         arg.integer.value = sleep_state;
 311
 312         status = acpi_evaluate_object(NULL, METHOD_NAME__GTS, &arg_list, NULL);
 313         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
 314                 return_ACPI_STATUS(status);
 315         }
 316
 317         /* Get current value of PM1A control */
 318
 319         status = acpi_hw_register_read(ACPI_REGISTER_PM1_CONTROL, &PM1Acontrol);
 320         if (ACPI_FAILURE(status)) {
 321                 return_ACPI_STATUS(status);
 322         }
 323         ACPI_DEBUG_PRINT((ACPI_DB_INIT,
 324                           "Entering sleep state [S%d]\n", sleep_state));
 325
 326         /* Clear SLP_EN and SLP_TYP fields */
 327
 328         PM1Acontrol &= ~(sleep_type_reg_info->access_bit_mask |
 329                          sleep_enable_reg_info->access_bit_mask);
 330         PM1Bcontrol = PM1Acontrol;
 331
 332         /* Insert SLP_TYP bits */
 333
 334         PM1Acontrol |=
 335             (acpi_gbl_sleep_type_a << sleep_type_reg_info->bit_position);
 336         PM1Bcontrol |=
 337             (acpi_gbl_sleep_type_b << sleep_type_reg_info->bit_position);
 338
 339         /*
 340          * We split the writes of SLP_TYP and SLP_EN to workaround
 341          * poorly implemented hardware.
 342          */
 343
 344         /* Write #1: fill in SLP_TYP data */
 345
 346         status = acpi_hw_register_write(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_REGISTER_PM1B_CONTROL,
 353                                         PM1Bcontrol);
 354         if (ACPI_FAILURE(status)) {
 355                 return_ACPI_STATUS(status);
 356         }
 357
 358         /* Insert SLP_ENABLE bit */
 359
 360         PM1Acontrol |= sleep_enable_reg_info->access_bit_mask;
 361         PM1Bcontrol |= sleep_enable_reg_info->access_bit_mask;
 362
 363         /* Write #2: SLP_TYP + SLP_EN */
 364
 365         ACPI_FLUSH_CPU_CACHE();
 366
 367         status = acpi_hw_register_write(ACPI_REGISTER_PM1A_CONTROL,
 368                                         PM1Acontrol);
 369         if (ACPI_FAILURE(status)) {
 370                 return_ACPI_STATUS(status);
 371         }
 372
 373         status = acpi_hw_register_write(ACPI_REGISTER_PM1B_CONTROL,
 374                                         PM1Bcontrol);
 375         if (ACPI_FAILURE(status)) {
 376                 return_ACPI_STATUS(status);
 377         }
 378
 379         if (sleep_state > ACPI_STATE_S3) {
 380                 /*
 381                  * We wanted to sleep > S3, but it didn't happen (by virtue of the
 382                  * fact that we are still executing!)
 383                  *
 384                  * Wait ten seconds, then try again. This is to get S4/S5 to work on
 385                  * all machines.
 386                  *
 387                  * We wait so long to allow chipsets that poll this reg very slowly to
 388                  * still read the right value. Ideally, this block would go
 389                  * away entirely.
 390                  */
 391                 acpi_os_stall(10000000);
 392
 393                 status = acpi_hw_register_write(ACPI_REGISTER_PM1_CONTROL,
 394                                                 sleep_enable_reg_info->
 395                                                 access_bit_mask);
 396                 if (ACPI_FAILURE(status)) {
 397                         return_ACPI_STATUS(status);
 398                 }
 399         }
 400
 401         /* Wait until we enter sleep state */
 402
 403         do {
 404                 status = acpi_get_register_unlocked(ACPI_BITREG_WAKE_STATUS,
 405                                                     &in_value);
 406                 if (ACPI_FAILURE(status)) {
 407                         return_ACPI_STATUS(status);
 408                 }
 409
 410                 /* Spin until we wake */
 411
 412         } while (!in_value);
 413
 414         return_ACPI_STATUS(AE_OK);
 415 }
 416
 417 ACPI_EXPORT_SYMBOL(acpi_enter_sleep_state)
 418
 419 /*******************************************************************************
 420  *
 421  * FUNCTION:    acpi_enter_sleep_state_s4bios
 422  *
 423  * PARAMETERS:  None
 424  *
 425  * RETURN:      Status
 426  *
 427  * DESCRIPTION: Perform a S4 bios request.
 428  *              THIS FUNCTION MUST BE CALLED WITH INTERRUPTS DISABLED
 429  *
 430  ******************************************************************************/
 431 acpi_status asmlinkage acpi_enter_sleep_state_s4bios(void)
 432 {
 433         u32 in_value;
 434         acpi_status status;
 435
 436         ACPI_FUNCTION_TRACE(acpi_enter_sleep_state_s4bios);
 437
 438         status = acpi_set_register(ACPI_BITREG_WAKE_STATUS, 1);
 439         if (ACPI_FAILURE(status)) {
 440                 return_ACPI_STATUS(status);
 441         }
 442
 443         status = acpi_hw_clear_acpi_status();
 444         if (ACPI_FAILURE(status)) {
 445                 return_ACPI_STATUS(status);
 446         }
 447
 448         /*
 449          * 1) Disable/Clear all GPEs
 450          * 2) Enable all wakeup GPEs
 451          */
 452         status = acpi_hw_disable_all_gpes();
 453         if (ACPI_FAILURE(status)) {
 454                 return_ACPI_STATUS(status);
 455         }
 456         acpi_gbl_system_awake_and_running = FALSE;
 457
 458         status = acpi_hw_enable_all_wakeup_gpes();
 459         if (ACPI_FAILURE(status)) {
 460                 return_ACPI_STATUS(status);
 461         }
 462
 463         ACPI_FLUSH_CPU_CACHE();
 464
 465         status = acpi_os_write_port(acpi_gbl_FADT.smi_command,
 466                                     (u32) acpi_gbl_FADT.S4bios_request, 8);
 467
 468         do {
 469                 acpi_os_stall(1000);
 470                 status = acpi_get_register(ACPI_BITREG_WAKE_STATUS, &in_value);
 471                 if (ACPI_FAILURE(status)) {
 472                         return_ACPI_STATUS(status);
 473                 }
 474         } while (!in_value);
 475
 476         return_ACPI_STATUS(AE_OK);
 477 }
 478
 479 ACPI_EXPORT_SYMBOL(acpi_enter_sleep_state_s4bios)
 480
 481 /*******************************************************************************
 482  *
 483  * FUNCTION:    acpi_leave_sleep_state_prep
 484  *
 485  * PARAMETERS:  sleep_state         - Which sleep state we are exiting
 486  *
 487  * RETURN:      Status
 488  *
 489  * DESCRIPTION: Perform the first state of OS-independent ACPI cleanup after a
 490  *              sleep.
 491  *              Called with interrupts DISABLED.
 492  *
 493  ******************************************************************************/
 494 acpi_status acpi_leave_sleep_state_prep(u8 sleep_state)
 495 {
 496         struct acpi_object_list arg_list;
 497         union acpi_object arg;
 498         acpi_status status;
 499         struct acpi_bit_register_info *sleep_type_reg_info;
 500         struct acpi_bit_register_info *sleep_enable_reg_info;
 501         u32 PM1Acontrol;
 502         u32 PM1Bcontrol;
 503
 504         ACPI_FUNCTION_TRACE(acpi_leave_sleep_state_prep);
 505
 506         /*
 507          * Set SLP_TYPE and SLP_EN to state S0.
 508          * This is unclear from the ACPI Spec, but it is required
 509          * by some machines.
 510          */
 511         status = acpi_get_sleep_type_data(ACPI_STATE_S0,
 512                                           &acpi_gbl_sleep_type_a,
 513                                           &acpi_gbl_sleep_type_b);
 514         if (ACPI_SUCCESS(status)) {
 515                 sleep_type_reg_info =
 516                     acpi_hw_get_bit_register_info(ACPI_BITREG_SLEEP_TYPE_A);
 517                 sleep_enable_reg_info =
 518                     acpi_hw_get_bit_register_info(ACPI_BITREG_SLEEP_ENABLE);
 519
 520                 /* Get current value of PM1A control */
 521
 522                 status = acpi_hw_register_read(ACPI_REGISTER_PM1_CONTROL,
 523                                                &PM1Acontrol);
 524                 if (ACPI_SUCCESS(status)) {
 525
 526                         /* Clear SLP_EN and SLP_TYP fields */
 527
 528                         PM1Acontrol &= ~(sleep_type_reg_info->access_bit_mask |
 529                                          sleep_enable_reg_info->
 530                                          access_bit_mask);
 531                         PM1Bcontrol = PM1Acontrol;
 532
 533                         /* Insert SLP_TYP bits */
 534
 535                         PM1Acontrol |=
 536                             (acpi_gbl_sleep_type_a << sleep_type_reg_info->
 537                              bit_position);
 538                         PM1Bcontrol |=
 539                             (acpi_gbl_sleep_type_b << sleep_type_reg_info->
 540                              bit_position);
 541
 542                         /* Just ignore any errors */
 543
 544                         (void)acpi_hw_register_write(ACPI_REGISTER_PM1A_CONTROL,
 545                                                      PM1Acontrol);
 546                         (void)acpi_hw_register_write(ACPI_REGISTER_PM1B_CONTROL,
 547                                                      PM1Bcontrol);
 548                 }
 549         }
 550
 551         /* Execute the _BFS method */
 552
 553         arg_list.count = 1;
 554         arg_list.pointer = &arg;
 555         arg.type = ACPI_TYPE_INTEGER;
 556         arg.integer.value = sleep_state;
 557
 558         status = acpi_evaluate_object(NULL, METHOD_NAME__BFS, &arg_list, NULL);
 559         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
 560                 ACPI_EXCEPTION((AE_INFO, status, "During Method _BFS"));
 561         }
 562
 563         return_ACPI_STATUS(status);
 564 }
 565
 566 /*******************************************************************************
 567  *
 568  * FUNCTION:    acpi_leave_sleep_state
 569  *
 570  * PARAMETERS:  sleep_state         - Which sleep state we just exited
 571  *
 572  * RETURN:      Status
 573  *
 574  * DESCRIPTION: Perform OS-independent ACPI cleanup after a sleep
 575  *              Called with interrupts ENABLED.
 576  *
 577  ******************************************************************************/
 578 acpi_status acpi_leave_sleep_state(u8 sleep_state)
 579 {
 580         struct acpi_object_list arg_list;
 581         union acpi_object arg;
 582         acpi_status status;
 583
 584         ACPI_FUNCTION_TRACE(acpi_leave_sleep_state);
 585
 586         /* Ensure enter_sleep_state_prep -> enter_sleep_state ordering */
 587
 588         acpi_gbl_sleep_type_a = ACPI_SLEEP_TYPE_INVALID;
 589
 590         /* Setup parameter object */
 591
 592         arg_list.count = 1;
 593         arg_list.pointer = &arg;
 594         arg.type = ACPI_TYPE_INTEGER;
 595
 596         /* Ignore any errors from these methods */
 597
 598         arg.integer.value = ACPI_SST_WAKING;
 599         status = acpi_evaluate_object(NULL, METHOD_NAME__SST, &arg_list, NULL);
 600         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
 601                 ACPI_EXCEPTION((AE_INFO, status, "During Method _SST"));
 602         }
 603
 604         /*
 605          * GPEs must be enabled before _WAK is called as GPEs
 606          * might get fired there
 607          *
 608          * Restore the GPEs:
 609          * 1) Disable/Clear all GPEs
 610          * 2) Enable all runtime GPEs
 611          */
 612         status = acpi_hw_disable_all_gpes();
 613         if (ACPI_FAILURE(status)) {
 614                 return_ACPI_STATUS(status);
 615         }
 616         status = acpi_hw_enable_all_runtime_gpes();
 617         if (ACPI_FAILURE(status)) {
 618                 return_ACPI_STATUS(status);
 619         }
 620
 621         arg.integer.value = sleep_state;
 622         status = acpi_evaluate_object(NULL, METHOD_NAME__WAK, &arg_list, NULL);
 623         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
 624                 ACPI_EXCEPTION((AE_INFO, status, "During Method _WAK"));
 625         }
 626         /* TBD: _WAK "sometimes" returns stuff - do we want to look at it? */
 627
 628         acpi_gbl_system_awake_and_running = TRUE;
 629
 630         /* Enable power button */
 631
 632         (void)
 633             acpi_set_register(acpi_gbl_fixed_event_info
 634                               [ACPI_EVENT_POWER_BUTTON].enable_register_id, 1);
 635
 636         (void)
 637             acpi_set_register(acpi_gbl_fixed_event_info
 638                               [ACPI_EVENT_POWER_BUTTON].status_register_id, 1);
 639
 640         arg.integer.value = ACPI_SST_WORKING;
 641         status = acpi_evaluate_object(NULL, METHOD_NAME__SST, &arg_list, NULL);
 642         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
 643                 ACPI_EXCEPTION((AE_INFO, status, "During Method _SST"));
 644         }
 645
 646         return_ACPI_STATUS(status);
 647 }
 648
 649 ACPI_EXPORT_SYMBOL(acpi_leave_sleep_state)