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 - 2005, 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 <linux/module.h>
  46
  47 #include <acpi/acpi.h>
  48
  49 #define _COMPONENT          ACPI_HARDWARE
  50          ACPI_MODULE_NAME    ("hwsleep")
  51
  52
  53 #define METHOD_NAME__BFS        "\\_BFS"
  54 #define METHOD_NAME__GTS        "\\_GTS"
  55 #define METHOD_NAME__PTS        "\\_PTS"
  56 #define METHOD_NAME__SST        "\\_SI._SST"
  57 #define METHOD_NAME__WAK        "\\_WAK"
  58
  59 #define ACPI_SST_INDICATOR_OFF  0
  60 #define ACPI_SST_WORKING        1
  61 #define ACPI_SST_WAKING         2
  62 #define ACPI_SST_SLEEPING       3
  63 #define ACPI_SST_SLEEP_CONTEXT  4
  64
  65
  66 /******************************************************************************
  67  *
  68  * FUNCTION:    acpi_set_firmware_waking_vector
  69  *
  70  * PARAMETERS:  physical_address    - Physical address of ACPI real mode
  71  *                                    entry point.
  72  *
  73  * RETURN:      Status
  74  *
  75  * DESCRIPTION: access function for d_firmware_waking_vector field in FACS
  76  *
  77  ******************************************************************************/
  78
  79 acpi_status
  80 acpi_set_firmware_waking_vector (
  81         acpi_physical_address physical_address)
  82 {
  83
  84         ACPI_FUNCTION_TRACE ("acpi_set_firmware_waking_vector");
  85
  86
  87         /* Set the vector */
  88
  89         if (acpi_gbl_common_fACS.vector_width == 32) {
  90                 *(ACPI_CAST_PTR (u32, acpi_gbl_common_fACS.firmware_waking_vector))
  91                                 = (u32) physical_address;
  92         }
  93         else {
  94                 *acpi_gbl_common_fACS.firmware_waking_vector
  95                                 = physical_address;
  96         }
  97
  98         return_ACPI_STATUS (AE_OK);
  99 }
 100
 101
 102 /******************************************************************************
 103  *
 104  * FUNCTION:    acpi_get_firmware_waking_vector
 105  *
 106  * PARAMETERS:  *physical_address   - Output buffer where contents of
 107  *                                    the firmware_waking_vector field of
 108  *                                    the FACS will be stored.
 109  *
 110  * RETURN:      Status
 111  *
 112  * DESCRIPTION: Access function for firmware_waking_vector field in FACS
 113  *
 114  ******************************************************************************/
 115 #ifdef ACPI_FUTURE_USAGE
 116 acpi_status
 117 acpi_get_firmware_waking_vector (
 118         acpi_physical_address *physical_address)
 119 {
 120
 121         ACPI_FUNCTION_TRACE ("acpi_get_firmware_waking_vector");
 122
 123
 124         if (!physical_address) {
 125                 return_ACPI_STATUS (AE_BAD_PARAMETER);
 126         }
 127
 128         /* Get the vector */
 129
 130         if (acpi_gbl_common_fACS.vector_width == 32) {
 131                 *physical_address = (acpi_physical_address)
 132                         *(ACPI_CAST_PTR (u32, acpi_gbl_common_fACS.firmware_waking_vector));
 133         }
 134         else {
 135                 *physical_address =
 136                         *acpi_gbl_common_fACS.firmware_waking_vector;
 137         }
 138
 139         return_ACPI_STATUS (AE_OK);
 140 }
 141 #endif
 142
 143
 144 /******************************************************************************
 145  *
 146  * FUNCTION:    acpi_enter_sleep_state_prep
 147  *
 148  * PARAMETERS:  sleep_state         - Which sleep state to enter
 149  *
 150  * RETURN:      Status
 151  *
 152  * DESCRIPTION: Prepare to enter a system sleep state (see ACPI 2.0 spec p 231)
 153  *              This function must execute with interrupts enabled.
 154  *              We break sleeping into 2 stages so that OSPM can handle
 155  *              various OS-specific tasks between the two steps.
 156  *
 157  ******************************************************************************/
 158
 159 acpi_status
 160 acpi_enter_sleep_state_prep (
 161         u8                          sleep_state)
 162 {
 163         acpi_status                 status;
 164         struct acpi_object_list     arg_list;
 165         union acpi_object           arg;
 166
 167
 168         ACPI_FUNCTION_TRACE ("acpi_enter_sleep_state_prep");
 169
 170
 171         /*
 172          * _PSW methods could be run here to enable wake-on keyboard, LAN, etc.
 173          */
 174         status = acpi_get_sleep_type_data (sleep_state,
 175                           &acpi_gbl_sleep_type_a, &acpi_gbl_sleep_type_b);
 176         if (ACPI_FAILURE (status)) {
 177                 return_ACPI_STATUS (status);
 178         }
 179
 180         /* Setup parameter object */
 181
 182         arg_list.count = 1;
 183         arg_list.pointer = &arg;
 184
 185         arg.type = ACPI_TYPE_INTEGER;
 186         arg.integer.value = sleep_state;
 187
 188         /* Run the _PTS and _GTS methods */
 189
 190         status = acpi_evaluate_object (NULL, METHOD_NAME__PTS, &arg_list, NULL);
 191         if (ACPI_FAILURE (status) && status != AE_NOT_FOUND) {
 192                 return_ACPI_STATUS (status);
 193         }
 194
 195         status = acpi_evaluate_object (NULL, METHOD_NAME__GTS, &arg_list, NULL);
 196         if (ACPI_FAILURE (status) && status != AE_NOT_FOUND) {
 197                 return_ACPI_STATUS (status);
 198         }
 199
 200         /* Setup the argument to _SST */
 201
 202         switch (sleep_state) {
 203         case ACPI_STATE_S0:
 204                 arg.integer.value = ACPI_SST_WORKING;
 205                 break;
 206
 207         case ACPI_STATE_S1:
 208         case ACPI_STATE_S2:
 209         case ACPI_STATE_S3:
 210                 arg.integer.value = ACPI_SST_SLEEPING;
 211                 break;
 212
 213         case ACPI_STATE_S4:
 214                 arg.integer.value = ACPI_SST_SLEEP_CONTEXT;
 215                 break;
 216
 217         default:
 218                 arg.integer.value = ACPI_SST_INDICATOR_OFF; /* Default is indicator off */
 219                 break;
 220         }
 221
 222         /* Set the system indicators to show the desired sleep state. */
 223
 224         status = acpi_evaluate_object (NULL, METHOD_NAME__SST, &arg_list, NULL);
 225         if (ACPI_FAILURE (status) && status != AE_NOT_FOUND) {
 226                  ACPI_REPORT_ERROR (("Method _SST failed, %s\n", acpi_format_exception (status)));
 227         }
 228
 229         return_ACPI_STATUS (AE_OK);
 230 }
 231
 232
 233 /******************************************************************************
 234  *
 235  * FUNCTION:    acpi_enter_sleep_state
 236  *
 237  * PARAMETERS:  sleep_state         - Which sleep state to enter
 238  *
 239  * RETURN:      Status
 240  *
 241  * DESCRIPTION: Enter a system sleep state (see ACPI 2.0 spec p 231)
 242  *              THIS FUNCTION MUST BE CALLED WITH INTERRUPTS DISABLED
 243  *
 244  ******************************************************************************/
 245
 246 acpi_status asmlinkage
 247 acpi_enter_sleep_state (
 248         u8                              sleep_state)
 249 {
 250         u32                             PM1Acontrol;
 251         u32                             PM1Bcontrol;
 252         struct acpi_bit_register_info   *sleep_type_reg_info;
 253         struct acpi_bit_register_info   *sleep_enable_reg_info;
 254         u32                             in_value;
 255         acpi_status                     status;
 256
 257
 258         ACPI_FUNCTION_TRACE ("acpi_enter_sleep_state");
 259
 260
 261         if ((acpi_gbl_sleep_type_a > ACPI_SLEEP_TYPE_MAX) ||
 262                 (acpi_gbl_sleep_type_b > ACPI_SLEEP_TYPE_MAX)) {
 263                 ACPI_REPORT_ERROR (("Sleep values out of range: A=%X B=%X\n",
 264                         acpi_gbl_sleep_type_a, acpi_gbl_sleep_type_b));
 265                 return_ACPI_STATUS (AE_AML_OPERAND_VALUE);
 266         }
 267
 268         sleep_type_reg_info = acpi_hw_get_bit_register_info (ACPI_BITREG_SLEEP_TYPE_A);
 269         sleep_enable_reg_info = acpi_hw_get_bit_register_info (ACPI_BITREG_SLEEP_ENABLE);
 270
 271         /* Clear wake status */
 272
 273         status = acpi_set_register (ACPI_BITREG_WAKE_STATUS, 1, ACPI_MTX_DO_NOT_LOCK);
 274         if (ACPI_FAILURE (status)) {
 275                 return_ACPI_STATUS (status);
 276         }
 277
 278         /* Clear all fixed and general purpose status bits */
 279
 280         status = acpi_hw_clear_acpi_status (ACPI_MTX_DO_NOT_LOCK);
 281         if (ACPI_FAILURE (status)) {
 282                 return_ACPI_STATUS (status);
 283         }
 284
 285         /*
 286          * 1) Disable/Clear all GPEs
 287          * 2) Enable all wakeup GPEs
 288          */
 289         status = acpi_hw_disable_all_gpes (ACPI_ISR);
 290         if (ACPI_FAILURE (status)) {
 291                 return_ACPI_STATUS (status);
 292         }
 293         acpi_gbl_system_awake_and_running = FALSE;
 294
 295         status = acpi_hw_enable_all_wakeup_gpes (ACPI_ISR);
 296         if (ACPI_FAILURE (status)) {
 297                 return_ACPI_STATUS (status);
 298         }
 299
 300         /* Get current value of PM1A control */
 301
 302         status = acpi_hw_register_read (ACPI_MTX_DO_NOT_LOCK, ACPI_REGISTER_PM1_CONTROL, &PM1Acontrol);
 303         if (ACPI_FAILURE (status)) {
 304                 return_ACPI_STATUS (status);
 305         }
 306         ACPI_DEBUG_PRINT ((ACPI_DB_INIT, "Entering sleep state [S%d]\n", sleep_state));
 307
 308         /* Clear SLP_EN and SLP_TYP fields */
 309
 310         PM1Acontrol &= ~(sleep_type_reg_info->access_bit_mask | sleep_enable_reg_info->access_bit_mask);
 311         PM1Bcontrol = PM1Acontrol;
 312
 313         /* Insert SLP_TYP bits */
 314
 315         PM1Acontrol |= (acpi_gbl_sleep_type_a << sleep_type_reg_info->bit_position);
 316         PM1Bcontrol |= (acpi_gbl_sleep_type_b << sleep_type_reg_info->bit_position);
 317
 318         /*
 319          * We split the writes of SLP_TYP and SLP_EN to workaround
 320          * poorly implemented hardware.
 321          */
 322
 323         /* Write #1: fill in SLP_TYP data */
 324
 325         status = acpi_hw_register_write (ACPI_MTX_DO_NOT_LOCK, ACPI_REGISTER_PM1A_CONTROL, PM1Acontrol);
 326         if (ACPI_FAILURE (status)) {
 327                 return_ACPI_STATUS (status);
 328         }
 329
 330         status = acpi_hw_register_write (ACPI_MTX_DO_NOT_LOCK, ACPI_REGISTER_PM1B_CONTROL, PM1Bcontrol);
 331         if (ACPI_FAILURE (status)) {
 332                 return_ACPI_STATUS (status);
 333         }
 334
 335         /* Insert SLP_ENABLE bit */
 336
 337         PM1Acontrol |= sleep_enable_reg_info->access_bit_mask;
 338         PM1Bcontrol |= sleep_enable_reg_info->access_bit_mask;
 339
 340         /* Write #2: SLP_TYP + SLP_EN */
 341
 342         ACPI_FLUSH_CPU_CACHE ();
 343
 344         status = acpi_hw_register_write (ACPI_MTX_DO_NOT_LOCK, ACPI_REGISTER_PM1A_CONTROL, PM1Acontrol);
 345         if (ACPI_FAILURE (status)) {
 346                 return_ACPI_STATUS (status);
 347         }
 348
 349         status = acpi_hw_register_write (ACPI_MTX_DO_NOT_LOCK, ACPI_REGISTER_PM1B_CONTROL, PM1Bcontrol);
 350         if (ACPI_FAILURE (status)) {
 351                 return_ACPI_STATUS (status);
 352         }
 353
 354         if (sleep_state > ACPI_STATE_S3) {
 355                 /*
 356                  * We wanted to sleep > S3, but it didn't happen (by virtue of the fact that
 357                  * we are still executing!)
 358                  *
 359                  * Wait ten seconds, then try again. This is to get S4/S5 to work on all machines.
 360                  *
 361                  * We wait so long to allow chipsets that poll this reg very slowly to
 362                  * still read the right value. Ideally, this block would go
 363                  * away entirely.
 364                  */
 365                 acpi_os_stall (10000000);
 366
 367                 status = acpi_hw_register_write (ACPI_MTX_DO_NOT_LOCK, ACPI_REGISTER_PM1_CONTROL,
 368                                  sleep_enable_reg_info->access_bit_mask);
 369                 if (ACPI_FAILURE (status)) {
 370                         return_ACPI_STATUS (status);
 371                 }
 372         }
 373
 374         /* Wait until we enter sleep state */
 375
 376         do {
 377                 status = acpi_get_register (ACPI_BITREG_WAKE_STATUS, &in_value, ACPI_MTX_DO_NOT_LOCK);
 378                 if (ACPI_FAILURE (status)) {
 379                         return_ACPI_STATUS (status);
 380                 }
 381
 382                 /* Spin until we wake */
 383
 384         } while (!in_value);
 385
 386         return_ACPI_STATUS (AE_OK);
 387 }
 388 EXPORT_SYMBOL(acpi_enter_sleep_state);
 389
 390
 391 /******************************************************************************
 392  *
 393  * FUNCTION:    acpi_enter_sleep_state_s4bios
 394  *
 395  * PARAMETERS:  None
 396  *
 397  * RETURN:      Status
 398  *
 399  * DESCRIPTION: Perform a S4 bios request.
 400  *              THIS FUNCTION MUST BE CALLED WITH INTERRUPTS DISABLED
 401  *
 402  ******************************************************************************/
 403
 404 acpi_status asmlinkage
 405 acpi_enter_sleep_state_s4bios (
 406         void)
 407 {
 408         u32                             in_value;
 409         acpi_status                     status;
 410
 411
 412         ACPI_FUNCTION_TRACE ("acpi_enter_sleep_state_s4bios");
 413
 414
 415         status = acpi_set_register (ACPI_BITREG_WAKE_STATUS, 1, ACPI_MTX_DO_NOT_LOCK);
 416         if (ACPI_FAILURE (status)) {
 417                 return_ACPI_STATUS (status);
 418         }
 419
 420         status = acpi_hw_clear_acpi_status (ACPI_MTX_DO_NOT_LOCK);
 421         if (ACPI_FAILURE (status)) {
 422                 return_ACPI_STATUS (status);
 423         }
 424
 425         /*
 426          * 1) Disable/Clear all GPEs
 427          * 2) Enable all wakeup GPEs
 428          */
 429         status = acpi_hw_disable_all_gpes (ACPI_ISR);
 430         if (ACPI_FAILURE (status)) {
 431                 return_ACPI_STATUS (status);
 432         }
 433         acpi_gbl_system_awake_and_running = FALSE;
 434
 435         status = acpi_hw_enable_all_wakeup_gpes (ACPI_ISR);
 436         if (ACPI_FAILURE (status)) {
 437                 return_ACPI_STATUS (status);
 438         }
 439
 440         ACPI_FLUSH_CPU_CACHE ();
 441
 442         status = acpi_os_write_port (acpi_gbl_FADT->smi_cmd, (u32) acpi_gbl_FADT->S4bios_req, 8);
 443
 444         do {
 445                 acpi_os_stall(1000);
 446                 status = acpi_get_register (ACPI_BITREG_WAKE_STATUS, &in_value, ACPI_MTX_DO_NOT_LOCK);
 447                 if (ACPI_FAILURE (status)) {
 448                         return_ACPI_STATUS (status);
 449                 }
 450         } while (!in_value);
 451
 452         return_ACPI_STATUS (AE_OK);
 453 }
 454 EXPORT_SYMBOL(acpi_enter_sleep_state_s4bios);
 455
 456
 457 /******************************************************************************
 458  *
 459  * FUNCTION:    acpi_leave_sleep_state
 460  *
 461  * PARAMETERS:  sleep_state         - Which sleep state we just exited
 462  *
 463  * RETURN:      Status
 464  *
 465  * DESCRIPTION: Perform OS-independent ACPI cleanup after a sleep
 466  *              Called with interrupts ENABLED.
 467  *
 468  ******************************************************************************/
 469
 470 acpi_status
 471 acpi_leave_sleep_state (
 472         u8                              sleep_state)
 473 {
 474         struct acpi_object_list         arg_list;
 475         union acpi_object               arg;
 476         acpi_status                     status;
 477         struct acpi_bit_register_info   *sleep_type_reg_info;
 478         struct acpi_bit_register_info   *sleep_enable_reg_info;
 479         u32                             PM1Acontrol;
 480         u32                             PM1Bcontrol;
 481
 482
 483         ACPI_FUNCTION_TRACE ("acpi_leave_sleep_state");
 484
 485
 486         /*
 487          * Set SLP_TYPE and SLP_EN to state S0.
 488          * This is unclear from the ACPI Spec, but it is required
 489          * by some machines.
 490          */
 491         status = acpi_get_sleep_type_data (ACPI_STATE_S0,
 492                           &acpi_gbl_sleep_type_a, &acpi_gbl_sleep_type_b);
 493         if (ACPI_SUCCESS (status)) {
 494                 sleep_type_reg_info = acpi_hw_get_bit_register_info (ACPI_BITREG_SLEEP_TYPE_A);
 495                 sleep_enable_reg_info = acpi_hw_get_bit_register_info (ACPI_BITREG_SLEEP_ENABLE);
 496
 497                 /* Get current value of PM1A control */
 498
 499                 status = acpi_hw_register_read (ACPI_MTX_DO_NOT_LOCK,
 500                                  ACPI_REGISTER_PM1_CONTROL, &PM1Acontrol);
 501                 if (ACPI_SUCCESS (status)) {
 502                         /* Clear SLP_EN and SLP_TYP fields */
 503
 504                         PM1Acontrol &= ~(sleep_type_reg_info->access_bit_mask |
 505                                            sleep_enable_reg_info->access_bit_mask);
 506                         PM1Bcontrol = PM1Acontrol;
 507
 508                         /* Insert SLP_TYP bits */
 509
 510                         PM1Acontrol |= (acpi_gbl_sleep_type_a << sleep_type_reg_info->bit_position);
 511                         PM1Bcontrol |= (acpi_gbl_sleep_type_b << sleep_type_reg_info->bit_position);
 512
 513                         /* Just ignore any errors */
 514
 515                         (void) acpi_hw_register_write (ACPI_MTX_DO_NOT_LOCK,
 516                                           ACPI_REGISTER_PM1A_CONTROL, PM1Acontrol);
 517                         (void) acpi_hw_register_write (ACPI_MTX_DO_NOT_LOCK,
 518                                           ACPI_REGISTER_PM1B_CONTROL, PM1Bcontrol);
 519                 }
 520         }
 521
 522         /* Ensure enter_sleep_state_prep -> enter_sleep_state ordering */
 523
 524         acpi_gbl_sleep_type_a = ACPI_SLEEP_TYPE_INVALID;
 525
 526         /* Setup parameter object */
 527
 528         arg_list.count = 1;
 529         arg_list.pointer = &arg;
 530         arg.type = ACPI_TYPE_INTEGER;
 531
 532         /* Ignore any errors from these methods */
 533
 534         arg.integer.value = ACPI_SST_WAKING;
 535         status = acpi_evaluate_object (NULL, METHOD_NAME__SST, &arg_list, NULL);
 536         if (ACPI_FAILURE (status) && status != AE_NOT_FOUND) {
 537                 ACPI_REPORT_ERROR (("Method _SST failed, %s\n", acpi_format_exception (status)));
 538         }
 539
 540         arg.integer.value = sleep_state;
 541         status = acpi_evaluate_object (NULL, METHOD_NAME__BFS, &arg_list, NULL);
 542         if (ACPI_FAILURE (status) && status != AE_NOT_FOUND) {
 543                 ACPI_REPORT_ERROR (("Method _BFS failed, %s\n", acpi_format_exception (status)));
 544         }
 545
 546         status = acpi_evaluate_object (NULL, METHOD_NAME__WAK, &arg_list, NULL);
 547         if (ACPI_FAILURE (status) && status != AE_NOT_FOUND) {
 548                 ACPI_REPORT_ERROR (("Method _WAK failed, %s\n", acpi_format_exception (status)));
 549         }
 550         /* TBD: _WAK "sometimes" returns stuff - do we want to look at it? */
 551
 552         /*
 553          * Restore the GPEs:
 554          * 1) Disable/Clear all GPEs
 555          * 2) Enable all runtime GPEs
 556          */
 557         status = acpi_hw_disable_all_gpes (ACPI_NOT_ISR);
 558         if (ACPI_FAILURE (status)) {
 559                 return_ACPI_STATUS (status);
 560         }
 561         acpi_gbl_system_awake_and_running = TRUE;
 562
 563         status = acpi_hw_enable_all_runtime_gpes (ACPI_NOT_ISR);
 564         if (ACPI_FAILURE (status)) {
 565                 return_ACPI_STATUS (status);
 566         }
 567
 568         /* Enable power button */
 569
 570         (void) acpi_set_register(acpi_gbl_fixed_event_info[ACPI_EVENT_POWER_BUTTON].enable_register_id,
 571                         1, ACPI_MTX_DO_NOT_LOCK);
 572         (void) acpi_set_register(acpi_gbl_fixed_event_info[ACPI_EVENT_POWER_BUTTON].status_register_id,
 573                         1, ACPI_MTX_DO_NOT_LOCK);
 574
 575         arg.integer.value = ACPI_SST_WORKING;
 576         status = acpi_evaluate_object (NULL, METHOD_NAME__SST, &arg_list, NULL);
 577         if (ACPI_FAILURE (status) && status != AE_NOT_FOUND) {
 578                 ACPI_REPORT_ERROR (("Method _SST failed, %s\n", acpi_format_exception (status)));
 579         }
 580
 581         return_ACPI_STATUS (status);
 582 }