drivers/acpi/events/evxfevnt.c

   1 /******************************************************************************
   2  *
   3  * Module Name: evxfevnt - External Interfaces, ACPI event disable/enable
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2004, R. Byron Moore
   9  * All rights reserved.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions, and the following disclaimer,
  16  *    without modification.
  17  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  18  *    substantially similar to the "NO WARRANTY" disclaimer below
  19  *    ("Disclaimer") and any redistribution must be conditioned upon
  20  *    including a substantially similar Disclaimer requirement for further
  21  *    binary redistribution.
  22  * 3. Neither the names of the above-listed copyright holders nor the names
  23  *    of any contributors may be used to endorse or promote products derived
  24  *    from this software without specific prior written permission.
  25  *
  26  * Alternatively, this software may be distributed under the terms of the
  27  * GNU General Public License ("GPL") version 2 as published by the Free
  28  * Software Foundation.
  29  *
  30  * NO WARRANTY
  31  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  32  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  33  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  34  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  35  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  36  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  37  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  38  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  39  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  40  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  41  * POSSIBILITY OF SUCH DAMAGES.
  42  */
  43
  44
  45 #include <acpi/acpi.h>
  46 #include <acpi/acevents.h>
  47 #include <acpi/acnamesp.h>
  48
  49 #define _COMPONENT          ACPI_EVENTS
  50          ACPI_MODULE_NAME    ("evxfevnt")
  51
  52
  53 /*******************************************************************************
  54  *
  55  * FUNCTION:    acpi_enable
  56  *
  57  * PARAMETERS:  None
  58  *
  59  * RETURN:      Status
  60  *
  61  * DESCRIPTION: Transfers the system into ACPI mode.
  62  *
  63  ******************************************************************************/
  64
  65 acpi_status
  66 acpi_enable (void)
  67 {
  68         acpi_status                     status = AE_OK;
  69
  70
  71         ACPI_FUNCTION_TRACE ("acpi_enable");
  72
  73
  74         /* Make sure we have the FADT*/
  75
  76         if (!acpi_gbl_FADT) {
  77                 ACPI_DEBUG_PRINT ((ACPI_DB_WARN, "No FADT information present!\n"));
  78                 return_ACPI_STATUS (AE_NO_ACPI_TABLES);
  79         }
  80
  81         if (acpi_hw_get_mode() == ACPI_SYS_MODE_ACPI) {
  82                 ACPI_DEBUG_PRINT ((ACPI_DB_INIT, "System is already in ACPI mode\n"));
  83         }
  84         else {
  85                 /* Transition to ACPI mode */
  86
  87                 status = acpi_hw_set_mode (ACPI_SYS_MODE_ACPI);
  88                 if (ACPI_FAILURE (status)) {
  89                         ACPI_REPORT_ERROR (("Could not transition to ACPI mode.\n"));
  90                         return_ACPI_STATUS (status);
  91                 }
  92
  93                 ACPI_DEBUG_PRINT ((ACPI_DB_INIT, "Transition to ACPI mode successful\n"));
  94         }
  95
  96         return_ACPI_STATUS (status);
  97 }
  98
  99
 100 /*******************************************************************************
 101  *
 102  * FUNCTION:    acpi_disable
 103  *
 104  * PARAMETERS:  None
 105  *
 106  * RETURN:      Status
 107  *
 108  * DESCRIPTION: Transfers the system into LEGACY mode.
 109  *
 110  ******************************************************************************/
 111
 112 acpi_status
 113 acpi_disable (void)
 114 {
 115         acpi_status                     status = AE_OK;
 116
 117
 118         ACPI_FUNCTION_TRACE ("acpi_disable");
 119
 120
 121         if (!acpi_gbl_FADT) {
 122                 ACPI_DEBUG_PRINT ((ACPI_DB_WARN, "No FADT information present!\n"));
 123                 return_ACPI_STATUS (AE_NO_ACPI_TABLES);
 124         }
 125
 126         if (acpi_hw_get_mode() == ACPI_SYS_MODE_LEGACY) {
 127                 ACPI_DEBUG_PRINT ((ACPI_DB_INIT, "System is already in legacy (non-ACPI) mode\n"));
 128         }
 129         else {
 130                 /* Transition to LEGACY mode */
 131
 132                 status = acpi_hw_set_mode (ACPI_SYS_MODE_LEGACY);
 133
 134                 if (ACPI_FAILURE (status)) {
 135                         ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Could not exit ACPI mode to legacy mode"));
 136                         return_ACPI_STATUS (status);
 137                 }
 138
 139                 ACPI_DEBUG_PRINT ((ACPI_DB_INIT, "ACPI mode disabled\n"));
 140         }
 141
 142         return_ACPI_STATUS (status);
 143 }
 144
 145
 146 /*******************************************************************************
 147  *
 148  * FUNCTION:    acpi_enable_event
 149  *
 150  * PARAMETERS:  Event           - The fixed eventto be enabled
 151  *              Flags           - Reserved
 152  *
 153  * RETURN:      Status
 154  *
 155  * DESCRIPTION: Enable an ACPI event (fixed)
 156  *
 157  ******************************************************************************/
 158
 159 acpi_status
 160 acpi_enable_event (
 161         u32                             event,
 162         u32                             flags)
 163 {
 164         acpi_status                     status = AE_OK;
 165         u32                             value;
 166
 167
 168         ACPI_FUNCTION_TRACE ("acpi_enable_event");
 169
 170
 171         /* Decode the Fixed Event */
 172
 173         if (event > ACPI_EVENT_MAX) {
 174                 return_ACPI_STATUS (AE_BAD_PARAMETER);
 175         }
 176
 177         /*
 178          * Enable the requested fixed event (by writing a one to the
 179          * enable register bit)
 180          */
 181         status = acpi_set_register (acpi_gbl_fixed_event_info[event].enable_register_id,
 182                          1, ACPI_MTX_LOCK);
 183         if (ACPI_FAILURE (status)) {
 184                 return_ACPI_STATUS (status);
 185         }
 186
 187         /* Make sure that the hardware responded */
 188
 189         status = acpi_get_register (acpi_gbl_fixed_event_info[event].enable_register_id,
 190                           &value, ACPI_MTX_LOCK);
 191         if (ACPI_FAILURE (status)) {
 192                 return_ACPI_STATUS (status);
 193         }
 194
 195         if (value != 1) {
 196                 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
 197                         "Could not enable %s event\n", acpi_ut_get_event_name (event)));
 198                 return_ACPI_STATUS (AE_NO_HARDWARE_RESPONSE);
 199         }
 200
 201         return_ACPI_STATUS (status);
 202 }
 203
 204
 205 /*******************************************************************************
 206  *
 207  * FUNCTION:    acpi_enable_gpe
 208  *
 209  * PARAMETERS:  gpe_device      - Parent GPE Device
 210  *              gpe_number      - GPE level within the GPE block
 211  *              Flags           - Just enable, or also wake enable?
 212  *                                Called from ISR or not
 213  *
 214  * RETURN:      Status
 215  *
 216  * DESCRIPTION: Enable an ACPI event (general purpose)
 217  *
 218  ******************************************************************************/
 219
 220 acpi_status
 221 acpi_enable_gpe (
 222         acpi_handle                     gpe_device,
 223         u32                             gpe_number,
 224         u32                             flags)
 225 {
 226         acpi_status                     status = AE_OK;
 227         struct acpi_gpe_event_info      *gpe_event_info;
 228
 229
 230         ACPI_FUNCTION_TRACE ("acpi_enable_gpe");
 231
 232
 233         /* Use semaphore lock if not executing at interrupt level */
 234
 235         if (flags & ACPI_NOT_ISR) {
 236                 status = acpi_ut_acquire_mutex (ACPI_MTX_EVENTS);
 237                 if (ACPI_FAILURE (status)) {
 238                         return_ACPI_STATUS (status);
 239                 }
 240         }
 241
 242         /* Ensure that we have a valid GPE number */
 243
 244         gpe_event_info = acpi_ev_get_gpe_event_info (gpe_device, gpe_number);
 245         if (!gpe_event_info) {
 246                 status = AE_BAD_PARAMETER;
 247                 goto unlock_and_exit;
 248         }
 249
 250         /* Check for Wake vs Runtime GPE */
 251
 252         if (flags & ACPI_EVENT_WAKE_ENABLE) {
 253                 /* Ensure the requested wake GPE is disabled */
 254
 255                 status = acpi_hw_disable_gpe (gpe_event_info);
 256                 if (ACPI_FAILURE (status)) {
 257                         goto unlock_and_exit;
 258                 }
 259
 260                 /* Defer Enable of Wake GPE until sleep time */
 261
 262                 acpi_hw_enable_gpe_for_wakeup (gpe_event_info);
 263         }
 264         else {
 265                 /* Enable the requested runtime GPE  */
 266
 267                 status = acpi_hw_enable_gpe (gpe_event_info);
 268                 if (ACPI_FAILURE (status)) {
 269                         goto unlock_and_exit;
 270                 }
 271         }
 272
 273
 274 unlock_and_exit:
 275         if (flags & ACPI_NOT_ISR) {
 276                 (void) acpi_ut_release_mutex (ACPI_MTX_EVENTS);
 277         }
 278         return_ACPI_STATUS (status);
 279 }
 280
 281
 282 /*******************************************************************************
 283  *
 284  * FUNCTION:    acpi_disable_event
 285  *
 286  * PARAMETERS:  Event           - The fixed eventto be enabled
 287  *              Flags           - Reserved
 288  *
 289  * RETURN:      Status
 290  *
 291  * DESCRIPTION: Disable an ACPI event (fixed)
 292  *
 293  ******************************************************************************/
 294
 295 acpi_status
 296 acpi_disable_event (
 297         u32                             event,
 298         u32                             flags)
 299 {
 300         acpi_status                     status = AE_OK;
 301         u32                             value;
 302
 303
 304         ACPI_FUNCTION_TRACE ("acpi_disable_event");
 305
 306
 307         /* Decode the Fixed Event */
 308
 309         if (event > ACPI_EVENT_MAX) {
 310                 return_ACPI_STATUS (AE_BAD_PARAMETER);
 311         }
 312
 313         /*
 314          * Disable the requested fixed event (by writing a zero to the
 315          * enable register bit)
 316          */
 317         status = acpi_set_register (acpi_gbl_fixed_event_info[event].enable_register_id,
 318                          0, ACPI_MTX_LOCK);
 319         if (ACPI_FAILURE (status)) {
 320                 return_ACPI_STATUS (status);
 321         }
 322
 323         status = acpi_get_register (acpi_gbl_fixed_event_info[event].enable_register_id,
 324                          &value, ACPI_MTX_LOCK);
 325         if (ACPI_FAILURE (status)) {
 326                 return_ACPI_STATUS (status);
 327         }
 328
 329         if (value != 0) {
 330                 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
 331                         "Could not disable %s events\n", acpi_ut_get_event_name (event)));
 332                 return_ACPI_STATUS (AE_NO_HARDWARE_RESPONSE);
 333         }
 334
 335         return_ACPI_STATUS (status);
 336 }
 337
 338
 339 /*******************************************************************************
 340  *
 341  * FUNCTION:    acpi_disable_gpe
 342  *
 343  * PARAMETERS:  gpe_device      - Parent GPE Device
 344  *              gpe_number      - GPE level within the GPE block
 345  *              Flags           - Just enable, or also wake enable?
 346  *                                Called from ISR or not
 347  *
 348  * RETURN:      Status
 349  *
 350  * DESCRIPTION: Disable an ACPI event (general purpose)
 351  *
 352  ******************************************************************************/
 353
 354 acpi_status
 355 acpi_disable_gpe (
 356         acpi_handle                     gpe_device,
 357         u32                             gpe_number,
 358         u32                             flags)
 359 {
 360         acpi_status                     status = AE_OK;
 361         struct acpi_gpe_event_info      *gpe_event_info;
 362
 363
 364         ACPI_FUNCTION_TRACE ("acpi_disable_gpe");
 365
 366
 367         /* Use semaphore lock if not executing at interrupt level */
 368
 369         if (flags & ACPI_NOT_ISR) {
 370                 status = acpi_ut_acquire_mutex (ACPI_MTX_EVENTS);
 371                 if (ACPI_FAILURE (status)) {
 372                         return_ACPI_STATUS (status);
 373                 }
 374         }
 375
 376         /* Ensure that we have a valid GPE number */
 377
 378         gpe_event_info = acpi_ev_get_gpe_event_info (gpe_device, gpe_number);
 379         if (!gpe_event_info) {
 380                 status = AE_BAD_PARAMETER;
 381                 goto unlock_and_exit;
 382         }
 383
 384         /*
 385          * Only disable the requested GPE number for wake if specified.
 386          * Otherwise, turn it totally off
 387          */
 388         if (flags & ACPI_EVENT_WAKE_DISABLE) {
 389                 acpi_hw_disable_gpe_for_wakeup (gpe_event_info);
 390         }
 391         else {
 392                 status = acpi_hw_disable_gpe (gpe_event_info);
 393         }
 394
 395 unlock_and_exit:
 396         if (flags & ACPI_NOT_ISR) {
 397                 (void) acpi_ut_release_mutex (ACPI_MTX_EVENTS);
 398         }
 399         return_ACPI_STATUS (status);
 400 }
 401
 402
 403 /*******************************************************************************
 404  *
 405  * FUNCTION:    acpi_clear_event
 406  *
 407  * PARAMETERS:  Event           - The fixed event to be cleared
 408  *
 409  * RETURN:      Status
 410  *
 411  * DESCRIPTION: Clear an ACPI event (fixed)
 412  *
 413  ******************************************************************************/
 414
 415 acpi_status
 416 acpi_clear_event (
 417         u32                             event)
 418 {
 419         acpi_status                     status = AE_OK;
 420
 421
 422         ACPI_FUNCTION_TRACE ("acpi_clear_event");
 423
 424
 425         /* Decode the Fixed Event */
 426
 427         if (event > ACPI_EVENT_MAX) {
 428                 return_ACPI_STATUS (AE_BAD_PARAMETER);
 429         }
 430
 431         /*
 432          * Clear the requested fixed event (By writing a one to the
 433          * status register bit)
 434          */
 435         status = acpi_set_register (acpi_gbl_fixed_event_info[event].status_register_id,
 436                         1, ACPI_MTX_LOCK);
 437
 438         return_ACPI_STATUS (status);
 439 }
 440
 441
 442 /*******************************************************************************
 443  *
 444  * FUNCTION:    acpi_clear_gpe
 445  *
 446  * PARAMETERS:  gpe_device      - Parent GPE Device
 447  *              gpe_number      - GPE level within the GPE block
 448  *              Flags           - Called from an ISR or not
 449  *
 450  * RETURN:      Status
 451  *
 452  * DESCRIPTION: Clear an ACPI event (general purpose)
 453  *
 454  ******************************************************************************/
 455
 456 acpi_status
 457 acpi_clear_gpe (
 458         acpi_handle                     gpe_device,
 459         u32                             gpe_number,
 460         u32                             flags)
 461 {
 462         acpi_status                     status = AE_OK;
 463         struct acpi_gpe_event_info      *gpe_event_info;
 464
 465
 466         ACPI_FUNCTION_TRACE ("acpi_clear_gpe");
 467
 468
 469         /* Use semaphore lock if not executing at interrupt level */
 470
 471         if (flags & ACPI_NOT_ISR) {
 472                 status = acpi_ut_acquire_mutex (ACPI_MTX_EVENTS);
 473                 if (ACPI_FAILURE (status)) {
 474                         return_ACPI_STATUS (status);
 475                 }
 476         }
 477
 478         /* Ensure that we have a valid GPE number */
 479
 480         gpe_event_info = acpi_ev_get_gpe_event_info (gpe_device, gpe_number);
 481         if (!gpe_event_info) {
 482                 status = AE_BAD_PARAMETER;
 483                 goto unlock_and_exit;
 484         }
 485
 486         status = acpi_hw_clear_gpe (gpe_event_info);
 487
 488 unlock_and_exit:
 489         if (flags & ACPI_NOT_ISR) {
 490                 (void) acpi_ut_release_mutex (ACPI_MTX_EVENTS);
 491         }
 492         return_ACPI_STATUS (status);
 493 }
 494
 495
 496 /*******************************************************************************
 497  *
 498  * FUNCTION:    acpi_get_event_status
 499  *
 500  * PARAMETERS:  Event           - The fixed event
 501  *              Event Status    - Where the current status of the event will
 502  *                                be returned
 503  *
 504  * RETURN:      Status
 505  *
 506  * DESCRIPTION: Obtains and returns the current status of the event
 507  *
 508  ******************************************************************************/
 509
 510 acpi_status
 511 acpi_get_event_status (
 512         u32                             event,
 513         acpi_event_status               *event_status)
 514 {
 515         acpi_status                     status = AE_OK;
 516
 517
 518         ACPI_FUNCTION_TRACE ("acpi_get_event_status");
 519
 520
 521         if (!event_status) {
 522                 return_ACPI_STATUS (AE_BAD_PARAMETER);
 523         }
 524
 525         /* Decode the Fixed Event */
 526
 527         if (event > ACPI_EVENT_MAX) {
 528                 return_ACPI_STATUS (AE_BAD_PARAMETER);
 529         }
 530
 531         /* Get the status of the requested fixed event */
 532
 533         status = acpi_get_register (acpi_gbl_fixed_event_info[event].status_register_id,
 534                           event_status, ACPI_MTX_LOCK);
 535
 536         return_ACPI_STATUS (status);
 537 }
 538
 539
 540 /*******************************************************************************
 541  *
 542  * FUNCTION:    acpi_get_gpe_status
 543  *
 544  * PARAMETERS:  gpe_device      - Parent GPE Device
 545  *              gpe_number      - GPE level within the GPE block
 546  *              Flags           - Called from an ISR or not
 547  *              Event Status    - Where the current status of the event will
 548  *                                be returned
 549  *
 550  * RETURN:      Status
 551  *
 552  * DESCRIPTION: Get status of an event (general purpose)
 553  *
 554  ******************************************************************************/
 555
 556 acpi_status
 557 acpi_get_gpe_status (
 558         acpi_handle                     gpe_device,
 559         u32                             gpe_number,
 560         u32                             flags,
 561         acpi_event_status               *event_status)
 562 {
 563         acpi_status                     status = AE_OK;
 564         struct acpi_gpe_event_info      *gpe_event_info;
 565
 566
 567         ACPI_FUNCTION_TRACE ("acpi_get_gpe_status");
 568
 569
 570         /* Use semaphore lock if not executing at interrupt level */
 571
 572         if (flags & ACPI_NOT_ISR) {
 573                 status = acpi_ut_acquire_mutex (ACPI_MTX_EVENTS);
 574                 if (ACPI_FAILURE (status)) {
 575                         return_ACPI_STATUS (status);
 576                 }
 577         }
 578
 579         /* Ensure that we have a valid GPE number */
 580
 581         gpe_event_info = acpi_ev_get_gpe_event_info (gpe_device, gpe_number);
 582         if (!gpe_event_info) {
 583                 status = AE_BAD_PARAMETER;
 584                 goto unlock_and_exit;
 585         }
 586
 587         /* Obtain status on the requested GPE number */
 588
 589         status = acpi_hw_get_gpe_status (gpe_event_info, event_status);
 590
 591 unlock_and_exit:
 592         if (flags & ACPI_NOT_ISR) {
 593                 (void) acpi_ut_release_mutex (ACPI_MTX_EVENTS);
 594         }
 595         return_ACPI_STATUS (status);
 596 }
 597
 598
 599 /*******************************************************************************
 600  *
 601  * FUNCTION:    acpi_install_gpe_block
 602  *
 603  * PARAMETERS:  gpe_device          - Handle to the parent GPE Block Device
 604  *              gpe_block_address   - Address and space_iD
 605  *              register_count      - Number of GPE register pairs in the block
 606  *              interrupt_level     - H/W interrupt for the block
 607  *
 608  * RETURN:      Status
 609  *
 610  * DESCRIPTION: Create and Install a block of GPE registers
 611  *
 612  ******************************************************************************/
 613
 614 acpi_status
 615 acpi_install_gpe_block (
 616         acpi_handle                     gpe_device,
 617         struct acpi_generic_address     *gpe_block_address,
 618         u32                             register_count,
 619         u32                             interrupt_level)
 620 {
 621         acpi_status                     status;
 622         union acpi_operand_object       *obj_desc;
 623         struct acpi_namespace_node      *node;
 624         struct acpi_gpe_block_info      *gpe_block;
 625
 626
 627         ACPI_FUNCTION_TRACE ("acpi_install_gpe_block");
 628
 629
 630         if ((!gpe_device)      ||
 631                 (!gpe_block_address) ||
 632                 (!register_count)) {
 633                 return_ACPI_STATUS (AE_BAD_PARAMETER);
 634         }
 635
 636         status = acpi_ut_acquire_mutex (ACPI_MTX_NAMESPACE);
 637         if (ACPI_FAILURE (status)) {
 638                 return (status);
 639         }
 640
 641         node = acpi_ns_map_handle_to_node (gpe_device);
 642         if (!node) {
 643                 status = AE_BAD_PARAMETER;
 644                 goto unlock_and_exit;
 645         }
 646
 647         /*
 648          * For user-installed GPE Block Devices, the gpe_block_base_number
 649          * is always zero
 650          */
 651         status = acpi_ev_create_gpe_block (node, gpe_block_address, register_count,
 652                           0, interrupt_level, &gpe_block);
 653         if (ACPI_FAILURE (status)) {
 654                 goto unlock_and_exit;
 655         }
 656
 657         /* Get the device_object attached to the node */
 658
 659         obj_desc = acpi_ns_get_attached_object (node);
 660         if (!obj_desc) {
 661                 /* No object, create a new one */
 662
 663                 obj_desc = acpi_ut_create_internal_object (ACPI_TYPE_DEVICE);
 664                 if (!obj_desc) {
 665                         status = AE_NO_MEMORY;
 666                         goto unlock_and_exit;
 667                 }
 668
 669                 status = acpi_ns_attach_object (node, obj_desc, ACPI_TYPE_DEVICE);
 670
 671                 /* Remove local reference to the object */
 672
 673                 acpi_ut_remove_reference (obj_desc);
 674
 675                 if (ACPI_FAILURE (status)) {
 676                         goto unlock_and_exit;
 677                 }
 678         }
 679
 680         /* Install the GPE block in the device_object */
 681
 682         obj_desc->device.gpe_block = gpe_block;
 683
 684
 685 unlock_and_exit:
 686         (void) acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);
 687         return_ACPI_STATUS (status);
 688 }
 689
 690
 691 /*******************************************************************************
 692  *
 693  * FUNCTION:    acpi_remove_gpe_block
 694  *
 695  * PARAMETERS:  gpe_device          - Handle to the parent GPE Block Device
 696  *
 697  * RETURN:      Status
 698  *
 699  * DESCRIPTION: Remove a previously installed block of GPE registers
 700  *
 701  ******************************************************************************/
 702
 703 acpi_status
 704 acpi_remove_gpe_block (
 705         acpi_handle                     gpe_device)
 706 {
 707         union acpi_operand_object       *obj_desc;
 708         acpi_status                     status;
 709         struct acpi_namespace_node      *node;
 710
 711
 712         ACPI_FUNCTION_TRACE ("acpi_remove_gpe_block");
 713
 714
 715         if (!gpe_device) {
 716                 return_ACPI_STATUS (AE_BAD_PARAMETER);
 717         }
 718
 719         status = acpi_ut_acquire_mutex (ACPI_MTX_NAMESPACE);
 720         if (ACPI_FAILURE (status)) {
 721                 return (status);
 722         }
 723
 724         node = acpi_ns_map_handle_to_node (gpe_device);
 725         if (!node) {
 726                 status = AE_BAD_PARAMETER;
 727                 goto unlock_and_exit;
 728         }
 729
 730         /* Get the device_object attached to the node */
 731
 732         obj_desc = acpi_ns_get_attached_object (node);
 733         if (!obj_desc ||
 734                 !obj_desc->device.gpe_block) {
 735                 return_ACPI_STATUS (AE_NULL_OBJECT);
 736         }
 737
 738         /* Delete the GPE block (but not the device_object) */
 739
 740         status = acpi_ev_delete_gpe_block (obj_desc->device.gpe_block);
 741         if (ACPI_SUCCESS (status)) {
 742                 obj_desc->device.gpe_block = NULL;
 743         }
 744
 745 unlock_and_exit:
 746         (void) acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);
 747         return_ACPI_STATUS (status);
 748 }
 749