drivers/acpi/acpica/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 "accommon.h"
  47 #include "actables.h"
  48
  49 #define _COMPONENT          ACPI_HARDWARE
  50 ACPI_MODULE_NAME("hwsleep")
  51
  52 /*******************************************************************************
  53  *
  54  * FUNCTION:    acpi_set_firmware_waking_vector
  55  *
  56  * PARAMETERS:  physical_address    - 32-bit physical address of ACPI real mode
  57  *                                    entry point.
  58  *
  59  * RETURN:      Status
  60  *
  61  * DESCRIPTION: Sets the 32-bit firmware_waking_vector field of the FACS
  62  *
  63  ******************************************************************************/
  64 acpi_status
  65 acpi_set_firmware_waking_vector(u32 physical_address)
  66 {
  67         ACPI_FUNCTION_TRACE(acpi_set_firmware_waking_vector);
  68
  69
  70         /*
  71          * According to the ACPI specification 2.0c and later, the 64-bit
  72          * waking vector should be cleared and the 32-bit waking vector should
  73          * be used, unless we want the wake-up code to be called by the BIOS in
  74          * Protected Mode.  Some systems (for example HP dv5-1004nr) are known
  75          * to fail to resume if the 64-bit vector is used.
  76          */
  77
  78         /* Set the 32-bit vector */
  79
  80         acpi_gbl_FACS->firmware_waking_vector = physical_address;
  81
  82         /* Clear the 64-bit vector if it exists */
  83
  84         if ((acpi_gbl_FACS->length > 32) && (acpi_gbl_FACS->version >= 1)) {
  85                 acpi_gbl_FACS->xfirmware_waking_vector = 0;
  86         }
  87
  88         return_ACPI_STATUS(AE_OK);
  89 }
  90
  91 ACPI_EXPORT_SYMBOL(acpi_set_firmware_waking_vector)
  92
  93 #if ACPI_MACHINE_WIDTH == 64
  94 /*******************************************************************************
  95  *
  96  * FUNCTION:    acpi_set_firmware_waking_vector64
  97  *
  98  * PARAMETERS:  physical_address    - 64-bit physical address of ACPI protected
  99  *                                    mode entry point.
 100  *
 101  * RETURN:      Status
 102  *
 103  * DESCRIPTION: Sets the 64-bit X_firmware_waking_vector field of the FACS, if
 104  *              it exists in the table. This function is intended for use with
 105  *              64-bit host operating systems.
 106  *
 107  ******************************************************************************/
 108 acpi_status
 109 acpi_set_firmware_waking_vector64(u64 physical_address)
 110 {
 111         ACPI_FUNCTION_TRACE(acpi_set_firmware_waking_vector64);
 112
 113
 114         /* Determine if the 64-bit vector actually exists */
 115
 116         if ((acpi_gbl_FACS->length <= 32) || (acpi_gbl_FACS->version < 1)) {
 117                 return_ACPI_STATUS(AE_NOT_EXIST);
 118         }
 119
 120         /* Clear 32-bit vector, set the 64-bit X_ vector */
 121
 122         acpi_gbl_FACS->firmware_waking_vector = 0;
 123         acpi_gbl_FACS->xfirmware_waking_vector = physical_address;
 124
 125         return_ACPI_STATUS(AE_OK);
 126 }
 127
 128 ACPI_EXPORT_SYMBOL(acpi_set_firmware_waking_vector64)
 129 #endif
 130
 131 /*******************************************************************************
 132  *
 133  * FUNCTION:    acpi_enter_sleep_state_prep
 134  *
 135  * PARAMETERS:  sleep_state         - Which sleep state to enter
 136  *
 137  * RETURN:      Status
 138  *
 139  * DESCRIPTION: Prepare to enter a system sleep state (see ACPI 2.0 spec p 231)
 140  *              This function must execute with interrupts enabled.
 141  *              We break sleeping into 2 stages so that OSPM can handle
 142  *              various OS-specific tasks between the two steps.
 143  *
 144  ******************************************************************************/
 145 acpi_status acpi_enter_sleep_state_prep(u8 sleep_state)
 146 {
 147         acpi_status status;
 148         struct acpi_object_list arg_list;
 149         union acpi_object arg;
 150
 151         ACPI_FUNCTION_TRACE(acpi_enter_sleep_state_prep);
 152
 153         /* _PSW methods could be run here to enable wake-on keyboard, LAN, etc. */
 154
 155         status = acpi_get_sleep_type_data(sleep_state,
 156                                           &acpi_gbl_sleep_type_a,
 157                                           &acpi_gbl_sleep_type_b);
 158         if (ACPI_FAILURE(status)) {
 159                 return_ACPI_STATUS(status);
 160         }
 161
 162         /* Setup parameter object */
 163
 164         arg_list.count = 1;
 165         arg_list.pointer = &arg;
 166
 167         arg.type = ACPI_TYPE_INTEGER;
 168         arg.integer.value = sleep_state;
 169
 170         /* Run the _PTS method */
 171
 172         status = acpi_evaluate_object(NULL, METHOD_NAME__PTS, &arg_list, NULL);
 173         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
 174                 return_ACPI_STATUS(status);
 175         }
 176
 177         /* Setup the argument to _SST */
 178
 179         switch (sleep_state) {
 180         case ACPI_STATE_S0:
 181                 arg.integer.value = ACPI_SST_WORKING;
 182                 break;
 183
 184         case ACPI_STATE_S1:
 185         case ACPI_STATE_S2:
 186         case ACPI_STATE_S3:
 187                 arg.integer.value = ACPI_SST_SLEEPING;
 188                 break;
 189
 190         case ACPI_STATE_S4:
 191                 arg.integer.value = ACPI_SST_SLEEP_CONTEXT;
 192                 break;
 193
 194         default:
 195                 arg.integer.value = ACPI_SST_INDICATOR_OFF;     /* Default is off */
 196                 break;
 197         }
 198
 199         /*
 200          * Set the system indicators to show the desired sleep state.
 201          * _SST is an optional method (return no error if not found)
 202          */
 203         status = acpi_evaluate_object(NULL, METHOD_NAME__SST, &arg_list, NULL);
 204         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
 205                 ACPI_EXCEPTION((AE_INFO, status,
 206                                 "While executing method _SST"));
 207         }
 208
 209         return_ACPI_STATUS(AE_OK);
 210 }
 211
 212 ACPI_EXPORT_SYMBOL(acpi_enter_sleep_state_prep)
 213
 214 /*******************************************************************************
 215  *
 216  * FUNCTION:    acpi_enter_sleep_state
 217  *
 218  * PARAMETERS:  sleep_state         - Which sleep state to enter
 219  *
 220  * RETURN:      Status
 221  *
 222  * DESCRIPTION: Enter a system sleep state (see ACPI 2.0 spec p 231)
 223  *              THIS FUNCTION MUST BE CALLED WITH INTERRUPTS DISABLED
 224  *
 225  ******************************************************************************/
 226 acpi_status asmlinkage acpi_enter_sleep_state(u8 sleep_state)
 227 {
 228         u32 pm1a_control;
 229         u32 pm1b_control;
 230         struct acpi_bit_register_info *sleep_type_reg_info;
 231         struct acpi_bit_register_info *sleep_enable_reg_info;
 232         u32 in_value;
 233         struct acpi_object_list arg_list;
 234         union acpi_object arg;
 235         acpi_status status;
 236
 237         ACPI_FUNCTION_TRACE(acpi_enter_sleep_state);
 238
 239         if ((acpi_gbl_sleep_type_a > ACPI_SLEEP_TYPE_MAX) ||
 240             (acpi_gbl_sleep_type_b > ACPI_SLEEP_TYPE_MAX)) {
 241                 ACPI_ERROR((AE_INFO, "Sleep values out of range: A=%X B=%X",
 242                             acpi_gbl_sleep_type_a, acpi_gbl_sleep_type_b));
 243                 return_ACPI_STATUS(AE_AML_OPERAND_VALUE);
 244         }
 245
 246         sleep_type_reg_info =
 247             acpi_hw_get_bit_register_info(ACPI_BITREG_SLEEP_TYPE);
 248         sleep_enable_reg_info =
 249             acpi_hw_get_bit_register_info(ACPI_BITREG_SLEEP_ENABLE);
 250
 251         /* Clear wake status */
 252
 253         status = acpi_set_register(ACPI_BITREG_WAKE_STATUS, 1);
 254         if (ACPI_FAILURE(status)) {
 255                 return_ACPI_STATUS(status);
 256         }
 257
 258         /* Clear all fixed and general purpose status bits */
 259
 260         status = acpi_hw_clear_acpi_status();
 261         if (ACPI_FAILURE(status)) {
 262                 return_ACPI_STATUS(status);
 263         }
 264
 265         /*
 266          * 1) Disable/Clear all GPEs
 267          * 2) Enable all wakeup GPEs
 268          */
 269         status = acpi_hw_disable_all_gpes();
 270         if (ACPI_FAILURE(status)) {
 271                 return_ACPI_STATUS(status);
 272         }
 273         acpi_gbl_system_awake_and_running = FALSE;
 274
 275         status = acpi_hw_enable_all_wakeup_gpes();
 276         if (ACPI_FAILURE(status)) {
 277                 return_ACPI_STATUS(status);
 278         }
 279
 280         /* Execute the _GTS method */
 281
 282         arg_list.count = 1;
 283         arg_list.pointer = &arg;
 284         arg.type = ACPI_TYPE_INTEGER;
 285         arg.integer.value = sleep_state;
 286
 287         status = acpi_evaluate_object(NULL, METHOD_NAME__GTS, &arg_list, NULL);
 288         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
 289                 return_ACPI_STATUS(status);
 290         }
 291
 292         /* Get current value of PM1A control */
 293
 294         status = acpi_hw_register_read(ACPI_REGISTER_PM1_CONTROL,
 295                                        &pm1a_control);
 296         if (ACPI_FAILURE(status)) {
 297                 return_ACPI_STATUS(status);
 298         }
 299         ACPI_DEBUG_PRINT((ACPI_DB_INIT,
 300                           "Entering sleep state [S%d]\n", sleep_state));
 301
 302         /* Clear the SLP_EN and SLP_TYP fields */
 303
 304         pm1a_control &= ~(sleep_type_reg_info->access_bit_mask |
 305                           sleep_enable_reg_info->access_bit_mask);
 306         pm1b_control = pm1a_control;
 307
 308         /* Insert the SLP_TYP bits */
 309
 310         pm1a_control |=
 311             (acpi_gbl_sleep_type_a << sleep_type_reg_info->bit_position);
 312         pm1b_control |=
 313             (acpi_gbl_sleep_type_b << sleep_type_reg_info->bit_position);
 314
 315         /*
 316          * We split the writes of SLP_TYP and SLP_EN to workaround
 317          * poorly implemented hardware.
 318          */
 319
 320         /* Write #1: write the SLP_TYP data to the PM1 Control registers */
 321
 322         status = acpi_hw_write_pm1_control(pm1a_control, pm1b_control);
 323         if (ACPI_FAILURE(status)) {
 324                 return_ACPI_STATUS(status);
 325         }
 326
 327         /* Insert the sleep enable (SLP_EN) bit */
 328
 329         pm1a_control |= sleep_enable_reg_info->access_bit_mask;
 330         pm1b_control |= sleep_enable_reg_info->access_bit_mask;
 331
 332         /* Flush caches, as per ACPI specification */
 333
 334         ACPI_FLUSH_CPU_CACHE();
 335
 336         /* Write #2: Write both SLP_TYP + SLP_EN */
 337
 338         status = acpi_hw_write_pm1_control(pm1a_control, pm1b_control);
 339         if (ACPI_FAILURE(status)) {
 340                 return_ACPI_STATUS(status);
 341         }
 342
 343         if (sleep_state > ACPI_STATE_S3) {
 344                 /*
 345                  * We wanted to sleep > S3, but it didn't happen (by virtue of the
 346                  * fact that we are still executing!)
 347                  *
 348                  * Wait ten seconds, then try again. This is to get S4/S5 to work on
 349                  * all machines.
 350                  *
 351                  * We wait so long to allow chipsets that poll this reg very slowly to
 352                  * still read the right value. Ideally, this block would go
 353                  * away entirely.
 354                  */
 355                 acpi_os_stall(10000000);
 356
 357                 status = acpi_hw_register_write(ACPI_REGISTER_PM1_CONTROL,
 358                                                 sleep_enable_reg_info->
 359                                                 access_bit_mask);
 360                 if (ACPI_FAILURE(status)) {
 361                         return_ACPI_STATUS(status);
 362                 }
 363         }
 364
 365         /* Wait until we enter sleep state */
 366
 367         do {
 368                 status = acpi_get_register_unlocked(ACPI_BITREG_WAKE_STATUS,
 369                                                     &in_value);
 370                 if (ACPI_FAILURE(status)) {
 371                         return_ACPI_STATUS(status);
 372                 }
 373
 374                 /* Spin until we wake */
 375
 376         } while (!in_value);
 377
 378         return_ACPI_STATUS(AE_OK);
 379 }
 380
 381 ACPI_EXPORT_SYMBOL(acpi_enter_sleep_state)
 382
 383 /*******************************************************************************
 384  *
 385  * FUNCTION:    acpi_enter_sleep_state_s4bios
 386  *
 387  * PARAMETERS:  None
 388  *
 389  * RETURN:      Status
 390  *
 391  * DESCRIPTION: Perform a S4 bios request.
 392  *              THIS FUNCTION MUST BE CALLED WITH INTERRUPTS DISABLED
 393  *
 394  ******************************************************************************/
 395 acpi_status asmlinkage acpi_enter_sleep_state_s4bios(void)
 396 {
 397         u32 in_value;
 398         acpi_status status;
 399
 400         ACPI_FUNCTION_TRACE(acpi_enter_sleep_state_s4bios);
 401
 402         status = acpi_set_register(ACPI_BITREG_WAKE_STATUS, 1);
 403         if (ACPI_FAILURE(status)) {
 404                 return_ACPI_STATUS(status);
 405         }
 406
 407         status = acpi_hw_clear_acpi_status();
 408         if (ACPI_FAILURE(status)) {
 409                 return_ACPI_STATUS(status);
 410         }
 411
 412         /*
 413          * 1) Disable/Clear all GPEs
 414          * 2) Enable all wakeup GPEs
 415          */
 416         status = acpi_hw_disable_all_gpes();
 417         if (ACPI_FAILURE(status)) {
 418                 return_ACPI_STATUS(status);
 419         }
 420         acpi_gbl_system_awake_and_running = FALSE;
 421
 422         status = acpi_hw_enable_all_wakeup_gpes();
 423         if (ACPI_FAILURE(status)) {
 424                 return_ACPI_STATUS(status);
 425         }
 426
 427         ACPI_FLUSH_CPU_CACHE();
 428
 429         status = acpi_os_write_port(acpi_gbl_FADT.smi_command,
 430                                     (u32) acpi_gbl_FADT.S4bios_request, 8);
 431
 432         do {
 433                 acpi_os_stall(1000);
 434                 status = acpi_get_register(ACPI_BITREG_WAKE_STATUS, &in_value);
 435                 if (ACPI_FAILURE(status)) {
 436                         return_ACPI_STATUS(status);
 437                 }
 438         } while (!in_value);
 439
 440         return_ACPI_STATUS(AE_OK);
 441 }
 442
 443 ACPI_EXPORT_SYMBOL(acpi_enter_sleep_state_s4bios)
 444
 445 /*******************************************************************************
 446  *
 447  * FUNCTION:    acpi_leave_sleep_state_prep
 448  *
 449  * PARAMETERS:  sleep_state         - Which sleep state we are exiting
 450  *
 451  * RETURN:      Status
 452  *
 453  * DESCRIPTION: Perform the first state of OS-independent ACPI cleanup after a
 454  *              sleep.
 455  *              Called with interrupts DISABLED.
 456  *
 457  ******************************************************************************/
 458 acpi_status acpi_leave_sleep_state_prep(u8 sleep_state)
 459 {
 460         struct acpi_object_list arg_list;
 461         union acpi_object arg;
 462         acpi_status status;
 463         struct acpi_bit_register_info *sleep_type_reg_info;
 464         struct acpi_bit_register_info *sleep_enable_reg_info;
 465         u32 pm1a_control;
 466         u32 pm1b_control;
 467
 468         ACPI_FUNCTION_TRACE(acpi_leave_sleep_state_prep);
 469
 470         /*
 471          * Set SLP_TYPE and SLP_EN to state S0.
 472          * This is unclear from the ACPI Spec, but it is required
 473          * by some machines.
 474          */
 475         status = acpi_get_sleep_type_data(ACPI_STATE_S0,
 476                                           &acpi_gbl_sleep_type_a,
 477                                           &acpi_gbl_sleep_type_b);
 478         if (ACPI_SUCCESS(status)) {
 479                 sleep_type_reg_info =
 480                     acpi_hw_get_bit_register_info(ACPI_BITREG_SLEEP_TYPE);
 481                 sleep_enable_reg_info =
 482                     acpi_hw_get_bit_register_info(ACPI_BITREG_SLEEP_ENABLE);
 483
 484                 /* Get current value of PM1A control */
 485
 486                 status = acpi_hw_register_read(ACPI_REGISTER_PM1_CONTROL,
 487                                                &pm1a_control);
 488                 if (ACPI_SUCCESS(status)) {
 489
 490                         /* Clear the SLP_EN and SLP_TYP fields */
 491
 492                         pm1a_control &= ~(sleep_type_reg_info->access_bit_mask |
 493                                           sleep_enable_reg_info->
 494                                           access_bit_mask);
 495                         pm1b_control = pm1a_control;
 496
 497                         /* Insert the SLP_TYP bits */
 498
 499                         pm1a_control |=
 500                             (acpi_gbl_sleep_type_a << sleep_type_reg_info->
 501                              bit_position);
 502                         pm1b_control |=
 503                             (acpi_gbl_sleep_type_b << sleep_type_reg_info->
 504                              bit_position);
 505
 506                         /* Write the control registers and ignore any errors */
 507
 508                         (void)acpi_hw_write_pm1_control(pm1a_control,
 509                                                         pm1b_control);
 510                 }
 511         }
 512
 513         /* Execute the _BFS method */
 514
 515         arg_list.count = 1;
 516         arg_list.pointer = &arg;
 517         arg.type = ACPI_TYPE_INTEGER;
 518         arg.integer.value = sleep_state;
 519
 520         status = acpi_evaluate_object(NULL, METHOD_NAME__BFS, &arg_list, NULL);
 521         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
 522                 ACPI_EXCEPTION((AE_INFO, status, "During Method _BFS"));
 523         }
 524
 525         return_ACPI_STATUS(status);
 526 }
 527
 528 /*******************************************************************************
 529  *
 530  * FUNCTION:    acpi_leave_sleep_state
 531  *
 532  * PARAMETERS:  sleep_state         - Which sleep state we just exited
 533  *
 534  * RETURN:      Status
 535  *
 536  * DESCRIPTION: Perform OS-independent ACPI cleanup after a sleep
 537  *              Called with interrupts ENABLED.
 538  *
 539  ******************************************************************************/
 540 acpi_status acpi_leave_sleep_state(u8 sleep_state)
 541 {
 542         struct acpi_object_list arg_list;
 543         union acpi_object arg;
 544         acpi_status status;
 545
 546         ACPI_FUNCTION_TRACE(acpi_leave_sleep_state);
 547
 548         /* Ensure enter_sleep_state_prep -> enter_sleep_state ordering */
 549
 550         acpi_gbl_sleep_type_a = ACPI_SLEEP_TYPE_INVALID;
 551
 552         /* Setup parameter object */
 553
 554         arg_list.count = 1;
 555         arg_list.pointer = &arg;
 556         arg.type = ACPI_TYPE_INTEGER;
 557
 558         /* Ignore any errors from these methods */
 559
 560         arg.integer.value = ACPI_SST_WAKING;
 561         status = acpi_evaluate_object(NULL, METHOD_NAME__SST, &arg_list, NULL);
 562         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
 563                 ACPI_EXCEPTION((AE_INFO, status, "During Method _SST"));
 564         }
 565
 566         /*
 567          * GPEs must be enabled before _WAK is called as GPEs
 568          * might get fired there
 569          *
 570          * Restore the GPEs:
 571          * 1) Disable/Clear all GPEs
 572          * 2) Enable all runtime GPEs
 573          */
 574         status = acpi_hw_disable_all_gpes();
 575         if (ACPI_FAILURE(status)) {
 576                 return_ACPI_STATUS(status);
 577         }
 578         status = acpi_hw_enable_all_runtime_gpes();
 579         if (ACPI_FAILURE(status)) {
 580                 return_ACPI_STATUS(status);
 581         }
 582
 583         arg.integer.value = sleep_state;
 584         status = acpi_evaluate_object(NULL, METHOD_NAME__WAK, &arg_list, NULL);
 585         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
 586                 ACPI_EXCEPTION((AE_INFO, status, "During Method _WAK"));
 587         }
 588         /* TBD: _WAK "sometimes" returns stuff - do we want to look at it? */
 589
 590         /*
 591          * Some BIOSes assume that WAK_STS will be cleared on resume and use
 592          * it to determine whether the system is rebooting or resuming. Clear
 593          * it for compatibility.
 594          */
 595         acpi_set_register(ACPI_BITREG_WAKE_STATUS, 1);
 596
 597         acpi_gbl_system_awake_and_running = TRUE;
 598
 599         /* Enable power button */
 600
 601         (void)
 602             acpi_set_register(acpi_gbl_fixed_event_info
 603                               [ACPI_EVENT_POWER_BUTTON].enable_register_id, 1);
 604
 605         (void)
 606             acpi_set_register(acpi_gbl_fixed_event_info
 607                               [ACPI_EVENT_POWER_BUTTON].status_register_id, 1);
 608
 609         arg.integer.value = ACPI_SST_WORKING;
 610         status = acpi_evaluate_object(NULL, METHOD_NAME__SST, &arg_list, NULL);
 611         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
 612                 ACPI_EXCEPTION((AE_INFO, status, "During Method _SST"));
 613         }
 614
 615         return_ACPI_STATUS(status);
 616 }
 617
 618 ACPI_EXPORT_SYMBOL(acpi_leave_sleep_state)