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
  47 #define _COMPONENT          ACPI_HARDWARE
  48 ACPI_MODULE_NAME("hwsleep")
  49
  50 /*******************************************************************************
  51  *
  52  * FUNCTION:    acpi_set_firmware_waking_vector
  53  *
  54  * PARAMETERS:  physical_address    - Physical address of ACPI real mode
  55  *                                    entry point.
  56  *
  57  * RETURN:      Status
  58  *
  59  * DESCRIPTION: Access function for the firmware_waking_vector field in FACS
  60  *
  61  ******************************************************************************/
  62 acpi_status
  63 acpi_set_firmware_waking_vector(acpi_physical_address physical_address)
  64 {
  65
  66         ACPI_FUNCTION_TRACE(acpi_set_firmware_waking_vector);
  67
  68         /* Set the vector */
  69
  70         if (acpi_gbl_common_fACS.vector_width == 32) {
  71                 *(ACPI_CAST_PTR
  72                   (u32, acpi_gbl_common_fACS.firmware_waking_vector))
  73                     = (u32) physical_address;
  74         } else {
  75                 *acpi_gbl_common_fACS.firmware_waking_vector = physical_address;
  76         }
  77
  78         return_ACPI_STATUS(AE_OK);
  79 }
  80
  81 ACPI_EXPORT_SYMBOL(acpi_set_firmware_waking_vector)
  82
  83 /*******************************************************************************
  84  *
  85  * FUNCTION:    acpi_get_firmware_waking_vector
  86  *
  87  * PARAMETERS:  *physical_address   - Where the contents of
  88  *                                    the firmware_waking_vector field of
  89  *                                    the FACS will be returned.
  90  *
  91  * RETURN:      Status, vector
  92  *
  93  * DESCRIPTION: Access function for the firmware_waking_vector field in FACS
  94  *
  95  ******************************************************************************/
  96 #ifdef ACPI_FUTURE_USAGE
  97 acpi_status
  98 acpi_get_firmware_waking_vector(acpi_physical_address * physical_address)
  99 {
 100
 101         ACPI_FUNCTION_TRACE(acpi_get_firmware_waking_vector);
 102
 103         if (!physical_address) {
 104                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 105         }
 106
 107         /* Get the vector */
 108
 109         if (acpi_gbl_common_fACS.vector_width == 32) {
 110                 *physical_address = (acpi_physical_address)
 111                     *
 112                     (ACPI_CAST_PTR
 113                      (u32, acpi_gbl_common_fACS.firmware_waking_vector));
 114         } else {
 115                 *physical_address =
 116                     *acpi_gbl_common_fACS.firmware_waking_vector;
 117         }
 118
 119         return_ACPI_STATUS(AE_OK);
 120 }
 121
 122 ACPI_EXPORT_SYMBOL(acpi_get_firmware_waking_vector)
 123 #endif
 124
 125 /*******************************************************************************
 126  *
 127  * FUNCTION:    acpi_enter_sleep_state_prep
 128  *
 129  * PARAMETERS:  sleep_state         - Which sleep state to enter
 130  *
 131  * RETURN:      Status
 132  *
 133  * DESCRIPTION: Prepare to enter a system sleep state (see ACPI 2.0 spec p 231)
 134  *              This function must execute with interrupts enabled.
 135  *              We break sleeping into 2 stages so that OSPM can handle
 136  *              various OS-specific tasks between the two steps.
 137  *
 138  ******************************************************************************/
 139 acpi_status acpi_enter_sleep_state_prep(u8 sleep_state)
 140 {
 141         acpi_status status;
 142         struct acpi_object_list arg_list;
 143         union acpi_object arg;
 144
 145         ACPI_FUNCTION_TRACE(acpi_enter_sleep_state_prep);
 146
 147         /*
 148          * _PSW methods could be run here to enable wake-on keyboard, LAN, etc.
 149          */
 150         status = acpi_get_sleep_type_data(sleep_state,
 151                                           &acpi_gbl_sleep_type_a,
 152                                           &acpi_gbl_sleep_type_b);
 153         if (ACPI_FAILURE(status)) {
 154                 return_ACPI_STATUS(status);
 155         }
 156
 157         /* Setup parameter object */
 158
 159         arg_list.count = 1;
 160         arg_list.pointer = &arg;
 161
 162         arg.type = ACPI_TYPE_INTEGER;
 163         arg.integer.value = sleep_state;
 164
 165         /* Run the _PTS and _GTS methods */
 166
 167         status = acpi_evaluate_object(NULL, METHOD_NAME__PTS, &arg_list, NULL);
 168         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
 169                 return_ACPI_STATUS(status);
 170         }
 171
 172         status = acpi_evaluate_object(NULL, METHOD_NAME__GTS, &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         /* Set the system indicators to show the desired sleep state. */
 200
 201         status = acpi_evaluate_object(NULL, METHOD_NAME__SST, &arg_list, NULL);
 202         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
 203                 ACPI_EXCEPTION((AE_INFO, status,
 204                                 "While executing method _SST"));
 205         }
 206
 207         return_ACPI_STATUS(AE_OK);
 208 }
 209
 210 ACPI_EXPORT_SYMBOL(acpi_enter_sleep_state_prep)
 211
 212 /*******************************************************************************
 213  *
 214  * FUNCTION:    acpi_enter_sleep_state
 215  *
 216  * PARAMETERS:  sleep_state         - Which sleep state to enter
 217  *
 218  * RETURN:      Status
 219  *
 220  * DESCRIPTION: Enter a system sleep state (see ACPI 2.0 spec p 231)
 221  *              THIS FUNCTION MUST BE CALLED WITH INTERRUPTS DISABLED
 222  *
 223  ******************************************************************************/
 224 acpi_status asmlinkage acpi_enter_sleep_state(u8 sleep_state)
 225 {
 226         u32 PM1Acontrol;
 227         u32 PM1Bcontrol;
 228         struct acpi_bit_register_info *sleep_type_reg_info;
 229         struct acpi_bit_register_info *sleep_enable_reg_info;
 230         u32 in_value;
 231         acpi_status status;
 232
 233         ACPI_FUNCTION_TRACE(acpi_enter_sleep_state);
 234
 235         if ((acpi_gbl_sleep_type_a > ACPI_SLEEP_TYPE_MAX) ||
 236             (acpi_gbl_sleep_type_b > ACPI_SLEEP_TYPE_MAX)) {
 237                 ACPI_ERROR((AE_INFO, "Sleep values out of range: A=%X B=%X",
 238                             acpi_gbl_sleep_type_a, acpi_gbl_sleep_type_b));
 239                 return_ACPI_STATUS(AE_AML_OPERAND_VALUE);
 240         }
 241
 242         sleep_type_reg_info =
 243             acpi_hw_get_bit_register_info(ACPI_BITREG_SLEEP_TYPE_A);
 244         sleep_enable_reg_info =
 245             acpi_hw_get_bit_register_info(ACPI_BITREG_SLEEP_ENABLE);
 246
 247         /* Clear wake status */
 248
 249         status =
 250             acpi_set_register(ACPI_BITREG_WAKE_STATUS, 1, ACPI_MTX_DO_NOT_LOCK);
 251         if (ACPI_FAILURE(status)) {
 252                 return_ACPI_STATUS(status);
 253         }
 254
 255         /* Clear all fixed and general purpose status bits */
 256
 257         status = acpi_hw_clear_acpi_status(ACPI_MTX_DO_NOT_LOCK);
 258         if (ACPI_FAILURE(status)) {
 259                 return_ACPI_STATUS(status);
 260         }
 261
 262         /*
 263          * 1) Disable/Clear all GPEs
 264          * 2) Enable all wakeup GPEs
 265          */
 266         status = acpi_hw_disable_all_gpes();
 267         if (ACPI_FAILURE(status)) {
 268                 return_ACPI_STATUS(status);
 269         }
 270         acpi_gbl_system_awake_and_running = FALSE;
 271
 272         status = acpi_hw_enable_all_wakeup_gpes();
 273         if (ACPI_FAILURE(status)) {
 274                 return_ACPI_STATUS(status);
 275         }
 276
 277         /* Get current value of PM1A control */
 278
 279         status = acpi_hw_register_read(ACPI_MTX_DO_NOT_LOCK,
 280                                        ACPI_REGISTER_PM1_CONTROL, &PM1Acontrol);
 281         if (ACPI_FAILURE(status)) {
 282                 return_ACPI_STATUS(status);
 283         }
 284         ACPI_DEBUG_PRINT((ACPI_DB_INIT,
 285                           "Entering sleep state [S%d]\n", sleep_state));
 286
 287         /* Clear SLP_EN and SLP_TYP fields */
 288
 289         PM1Acontrol &= ~(sleep_type_reg_info->access_bit_mask |
 290                          sleep_enable_reg_info->access_bit_mask);
 291         PM1Bcontrol = PM1Acontrol;
 292
 293         /* Insert SLP_TYP bits */
 294
 295         PM1Acontrol |=
 296             (acpi_gbl_sleep_type_a << sleep_type_reg_info->bit_position);
 297         PM1Bcontrol |=
 298             (acpi_gbl_sleep_type_b << sleep_type_reg_info->bit_position);
 299
 300         /*
 301          * We split the writes of SLP_TYP and SLP_EN to workaround
 302          * poorly implemented hardware.
 303          */
 304
 305         /* Write #1: fill in SLP_TYP data */
 306
 307         status = acpi_hw_register_write(ACPI_MTX_DO_NOT_LOCK,
 308                                         ACPI_REGISTER_PM1A_CONTROL,
 309                                         PM1Acontrol);
 310         if (ACPI_FAILURE(status)) {
 311                 return_ACPI_STATUS(status);
 312         }
 313
 314         status = acpi_hw_register_write(ACPI_MTX_DO_NOT_LOCK,
 315                                         ACPI_REGISTER_PM1B_CONTROL,
 316                                         PM1Bcontrol);
 317         if (ACPI_FAILURE(status)) {
 318                 return_ACPI_STATUS(status);
 319         }
 320
 321         /* Insert SLP_ENABLE bit */
 322
 323         PM1Acontrol |= sleep_enable_reg_info->access_bit_mask;
 324         PM1Bcontrol |= sleep_enable_reg_info->access_bit_mask;
 325
 326         /* Write #2: SLP_TYP + SLP_EN */
 327
 328         ACPI_FLUSH_CPU_CACHE();
 329
 330         status = acpi_hw_register_write(ACPI_MTX_DO_NOT_LOCK,
 331                                         ACPI_REGISTER_PM1A_CONTROL,
 332                                         PM1Acontrol);
 333         if (ACPI_FAILURE(status)) {
 334                 return_ACPI_STATUS(status);
 335         }
 336
 337         status = acpi_hw_register_write(ACPI_MTX_DO_NOT_LOCK,
 338                                         ACPI_REGISTER_PM1B_CONTROL,
 339                                         PM1Bcontrol);
 340         if (ACPI_FAILURE(status)) {
 341                 return_ACPI_STATUS(status);
 342         }
 343
 344         if (sleep_state > ACPI_STATE_S3) {
 345                 /*
 346                  * We wanted to sleep > S3, but it didn't happen (by virtue of the
 347                  * fact that we are still executing!)
 348                  *
 349                  * Wait ten seconds, then try again. This is to get S4/S5 to work on
 350                  * all machines.
 351                  *
 352                  * We wait so long to allow chipsets that poll this reg very slowly to
 353                  * still read the right value. Ideally, this block would go
 354                  * away entirely.
 355                  */
 356                 acpi_os_stall(10000000);
 357
 358                 status = acpi_hw_register_write(ACPI_MTX_DO_NOT_LOCK,
 359                                                 ACPI_REGISTER_PM1_CONTROL,
 360                                                 sleep_enable_reg_info->
 361                                                 access_bit_mask);
 362                 if (ACPI_FAILURE(status)) {
 363                         return_ACPI_STATUS(status);
 364                 }
 365         }
 366
 367         /* Wait until we enter sleep state */
 368
 369         do {
 370                 status = acpi_get_register(ACPI_BITREG_WAKE_STATUS, &in_value,
 371                                            ACPI_MTX_DO_NOT_LOCK);
 372                 if (ACPI_FAILURE(status)) {
 373                         return_ACPI_STATUS(status);
 374                 }
 375
 376                 /* Spin until we wake */
 377
 378         } while (!in_value);
 379
 380         return_ACPI_STATUS(AE_OK);
 381 }
 382
 383 ACPI_EXPORT_SYMBOL(acpi_enter_sleep_state)
 384
 385 /*******************************************************************************
 386  *
 387  * FUNCTION:    acpi_enter_sleep_state_s4bios
 388  *
 389  * PARAMETERS:  None
 390  *
 391  * RETURN:      Status
 392  *
 393  * DESCRIPTION: Perform a S4 bios request.
 394  *              THIS FUNCTION MUST BE CALLED WITH INTERRUPTS DISABLED
 395  *
 396  ******************************************************************************/
 397 acpi_status asmlinkage acpi_enter_sleep_state_s4bios(void)
 398 {
 399         u32 in_value;
 400         acpi_status status;
 401
 402         ACPI_FUNCTION_TRACE(acpi_enter_sleep_state_s4bios);
 403
 404         status =
 405             acpi_set_register(ACPI_BITREG_WAKE_STATUS, 1, ACPI_MTX_DO_NOT_LOCK);
 406         if (ACPI_FAILURE(status)) {
 407                 return_ACPI_STATUS(status);
 408         }
 409
 410         status = acpi_hw_clear_acpi_status(ACPI_MTX_DO_NOT_LOCK);
 411         if (ACPI_FAILURE(status)) {
 412                 return_ACPI_STATUS(status);
 413         }
 414
 415         /*
 416          * 1) Disable/Clear all GPEs
 417          * 2) Enable all wakeup GPEs
 418          */
 419         status = acpi_hw_disable_all_gpes();
 420         if (ACPI_FAILURE(status)) {
 421                 return_ACPI_STATUS(status);
 422         }
 423         acpi_gbl_system_awake_and_running = FALSE;
 424
 425         status = acpi_hw_enable_all_wakeup_gpes();
 426         if (ACPI_FAILURE(status)) {
 427                 return_ACPI_STATUS(status);
 428         }
 429
 430         ACPI_FLUSH_CPU_CACHE();
 431
 432         status = acpi_os_write_port(acpi_gbl_FADT->smi_cmd,
 433                                     (u32) acpi_gbl_FADT->S4bios_req, 8);
 434
 435         do {
 436                 acpi_os_stall(1000);
 437                 status = acpi_get_register(ACPI_BITREG_WAKE_STATUS, &in_value,
 438                                            ACPI_MTX_DO_NOT_LOCK);
 439                 if (ACPI_FAILURE(status)) {
 440                         return_ACPI_STATUS(status);
 441                 }
 442         } while (!in_value);
 443
 444         return_ACPI_STATUS(AE_OK);
 445 }
 446
 447 ACPI_EXPORT_SYMBOL(acpi_enter_sleep_state_s4bios)
 448
 449 /*******************************************************************************
 450  *
 451  * FUNCTION:    acpi_leave_sleep_state
 452  *
 453  * PARAMETERS:  sleep_state         - Which sleep state we just exited
 454  *
 455  * RETURN:      Status
 456  *
 457  * DESCRIPTION: Perform OS-independent ACPI cleanup after a sleep
 458  *              Called with interrupts ENABLED.
 459  *
 460  ******************************************************************************/
 461 acpi_status acpi_leave_sleep_state(u8 sleep_state)
 462 {
 463         struct acpi_object_list arg_list;
 464         union acpi_object arg;
 465         acpi_status status;
 466         struct acpi_bit_register_info *sleep_type_reg_info;
 467         struct acpi_bit_register_info *sleep_enable_reg_info;
 468         u32 PM1Acontrol;
 469         u32 PM1Bcontrol;
 470
 471         ACPI_FUNCTION_TRACE(acpi_leave_sleep_state);
 472
 473         /*
 474          * Set SLP_TYPE and SLP_EN to state S0.
 475          * This is unclear from the ACPI Spec, but it is required
 476          * by some machines.
 477          */
 478         status = acpi_get_sleep_type_data(ACPI_STATE_S0,
 479                                           &acpi_gbl_sleep_type_a,
 480                                           &acpi_gbl_sleep_type_b);
 481         if (ACPI_SUCCESS(status)) {
 482                 sleep_type_reg_info =
 483                     acpi_hw_get_bit_register_info(ACPI_BITREG_SLEEP_TYPE_A);
 484                 sleep_enable_reg_info =
 485                     acpi_hw_get_bit_register_info(ACPI_BITREG_SLEEP_ENABLE);
 486
 487                 /* Get current value of PM1A control */
 488
 489                 status = acpi_hw_register_read(ACPI_MTX_DO_NOT_LOCK,
 490                                                ACPI_REGISTER_PM1_CONTROL,
 491                                                &PM1Acontrol);
 492                 if (ACPI_SUCCESS(status)) {
 493
 494                         /* Clear SLP_EN and SLP_TYP fields */
 495
 496                         PM1Acontrol &= ~(sleep_type_reg_info->access_bit_mask |
 497                                          sleep_enable_reg_info->
 498                                          access_bit_mask);
 499                         PM1Bcontrol = PM1Acontrol;
 500
 501                         /* Insert SLP_TYP bits */
 502
 503                         PM1Acontrol |=
 504                             (acpi_gbl_sleep_type_a << sleep_type_reg_info->
 505                              bit_position);
 506                         PM1Bcontrol |=
 507                             (acpi_gbl_sleep_type_b << sleep_type_reg_info->
 508                              bit_position);
 509
 510                         /* Just ignore any errors */
 511
 512                         (void)acpi_hw_register_write(ACPI_MTX_DO_NOT_LOCK,
 513                                                      ACPI_REGISTER_PM1A_CONTROL,
 514                                                      PM1Acontrol);
 515                         (void)acpi_hw_register_write(ACPI_MTX_DO_NOT_LOCK,
 516                                                      ACPI_REGISTER_PM1B_CONTROL,
 517                                                      PM1Bcontrol);
 518                 }
 519         }
 520
 521         /* Ensure enter_sleep_state_prep -> enter_sleep_state ordering */
 522
 523         acpi_gbl_sleep_type_a = ACPI_SLEEP_TYPE_INVALID;
 524
 525         /* Setup parameter object */
 526
 527         arg_list.count = 1;
 528         arg_list.pointer = &arg;
 529         arg.type = ACPI_TYPE_INTEGER;
 530
 531         /* Ignore any errors from these methods */
 532
 533         arg.integer.value = ACPI_SST_WAKING;
 534         status = acpi_evaluate_object(NULL, METHOD_NAME__SST, &arg_list, NULL);
 535         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
 536                 ACPI_EXCEPTION((AE_INFO, status, "During Method _SST"));
 537         }
 538
 539         arg.integer.value = sleep_state;
 540         status = acpi_evaluate_object(NULL, METHOD_NAME__BFS, &arg_list, NULL);
 541         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
 542                 ACPI_EXCEPTION((AE_INFO, status, "During Method _BFS"));
 543         }
 544
 545         status = acpi_evaluate_object(NULL, METHOD_NAME__WAK, &arg_list, NULL);
 546         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
 547                 ACPI_EXCEPTION((AE_INFO, status, "During Method _WAK"));
 548         }
 549         /* TBD: _WAK "sometimes" returns stuff - do we want to look at it? */
 550
 551         /*
 552          * Restore the GPEs:
 553          * 1) Disable/Clear all GPEs
 554          * 2) Enable all runtime GPEs
 555          */
 556         status = acpi_hw_disable_all_gpes();
 557         if (ACPI_FAILURE(status)) {
 558                 return_ACPI_STATUS(status);
 559         }
 560         acpi_gbl_system_awake_and_running = TRUE;
 561
 562         status = acpi_hw_enable_all_runtime_gpes();
 563         if (ACPI_FAILURE(status)) {
 564                 return_ACPI_STATUS(status);
 565         }
 566
 567         /* Enable power button */
 568
 569         (void)
 570             acpi_set_register(acpi_gbl_fixed_event_info
 571                               [ACPI_EVENT_POWER_BUTTON].enable_register_id, 1,
 572                               ACPI_MTX_DO_NOT_LOCK);
 573
 574         (void)
 575             acpi_set_register(acpi_gbl_fixed_event_info
 576                               [ACPI_EVENT_POWER_BUTTON].status_register_id, 1,
 577                               ACPI_MTX_DO_NOT_LOCK);
 578
 579         arg.integer.value = ACPI_SST_WORKING;
 580         status = acpi_evaluate_object(NULL, METHOD_NAME__SST, &arg_list, NULL);
 581         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
 582                 ACPI_EXCEPTION((AE_INFO, status, "During Method _SST"));
 583         }
 584
 585         return_ACPI_STATUS(status);
 586 }
 587
 588 ACPI_EXPORT_SYMBOL(acpi_leave_sleep_state)