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 - 2007, 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 #include <acpi/acpi.h>
  45 #include <acpi/acevents.h>
  46 #include <acpi/acnamesp.h>
  47 #include <acpi/actables.h>
  48
  49 #define _COMPONENT          ACPI_EVENTS
  50 ACPI_MODULE_NAME("evxfevnt")
  51
  52 /*******************************************************************************
  53  *
  54  * FUNCTION:    acpi_enable
  55  *
  56  * PARAMETERS:  None
  57  *
  58  * RETURN:      Status
  59  *
  60  * DESCRIPTION: Transfers the system into ACPI mode.
  61  *
  62  ******************************************************************************/
  63 acpi_status acpi_enable(void)
  64 {
  65         acpi_status status = AE_OK;
  66
  67         ACPI_FUNCTION_TRACE(acpi_enable);
  68
  69         /* ACPI tables must be present */
  70
  71         if (!acpi_tb_tables_loaded()) {
  72                 return_ACPI_STATUS(AE_NO_ACPI_TABLES);
  73         }
  74
  75         /* Check current mode */
  76
  77         if (acpi_hw_get_mode() == ACPI_SYS_MODE_ACPI) {
  78                 ACPI_DEBUG_PRINT((ACPI_DB_INIT,
  79                                   "System is already in ACPI mode\n"));
  80         } else {
  81                 /* Transition to ACPI mode */
  82
  83                 status = acpi_hw_set_mode(ACPI_SYS_MODE_ACPI);
  84                 if (ACPI_FAILURE(status)) {
  85                         ACPI_ERROR((AE_INFO,
  86                                     "Could not transition to ACPI mode"));
  87                         return_ACPI_STATUS(status);
  88                 }
  89
  90                 ACPI_DEBUG_PRINT((ACPI_DB_INIT,
  91                                   "Transition to ACPI mode successful\n"));
  92         }
  93
  94         return_ACPI_STATUS(status);
  95 }
  96
  97 ACPI_EXPORT_SYMBOL(acpi_enable)
  98
  99 /*******************************************************************************
 100  *
 101  * FUNCTION:    acpi_disable
 102  *
 103  * PARAMETERS:  None
 104  *
 105  * RETURN:      Status
 106  *
 107  * DESCRIPTION: Transfers the system into LEGACY (non-ACPI) mode.
 108  *
 109  ******************************************************************************/
 110 acpi_status acpi_disable(void)
 111 {
 112         acpi_status status = AE_OK;
 113
 114         ACPI_FUNCTION_TRACE(acpi_disable);
 115
 116         if (acpi_hw_get_mode() == ACPI_SYS_MODE_LEGACY) {
 117                 ACPI_DEBUG_PRINT((ACPI_DB_INIT,
 118                                   "System is already in legacy (non-ACPI) mode\n"));
 119         } else {
 120                 /* Transition to LEGACY mode */
 121
 122                 status = acpi_hw_set_mode(ACPI_SYS_MODE_LEGACY);
 123
 124                 if (ACPI_FAILURE(status)) {
 125                         ACPI_ERROR((AE_INFO,
 126                                     "Could not exit ACPI mode to legacy mode"));
 127                         return_ACPI_STATUS(status);
 128                 }
 129
 130                 ACPI_DEBUG_PRINT((ACPI_DB_INIT, "ACPI mode disabled\n"));
 131         }
 132
 133         return_ACPI_STATUS(status);
 134 }
 135
 136 ACPI_EXPORT_SYMBOL(acpi_disable)
 137
 138 /*******************************************************************************
 139  *
 140  * FUNCTION:    acpi_enable_event
 141  *
 142  * PARAMETERS:  Event           - The fixed eventto be enabled
 143  *              Flags           - Reserved
 144  *
 145  * RETURN:      Status
 146  *
 147  * DESCRIPTION: Enable an ACPI event (fixed)
 148  *
 149  ******************************************************************************/
 150 acpi_status acpi_enable_event(u32 event, u32 flags)
 151 {
 152         acpi_status status = AE_OK;
 153         u32 value;
 154
 155         ACPI_FUNCTION_TRACE(acpi_enable_event);
 156
 157         /* Decode the Fixed Event */
 158
 159         if (event > ACPI_EVENT_MAX) {
 160                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 161         }
 162
 163         /*
 164          * Enable the requested fixed event (by writing a one to the
 165          * enable register bit)
 166          */
 167         status =
 168             acpi_set_register(acpi_gbl_fixed_event_info[event].
 169                               enable_register_id, 1);
 170         if (ACPI_FAILURE(status)) {
 171                 return_ACPI_STATUS(status);
 172         }
 173
 174         /* Make sure that the hardware responded */
 175
 176         status =
 177             acpi_get_register(acpi_gbl_fixed_event_info[event].
 178                               enable_register_id, &value);
 179         if (ACPI_FAILURE(status)) {
 180                 return_ACPI_STATUS(status);
 181         }
 182
 183         if (value != 1) {
 184                 ACPI_ERROR((AE_INFO,
 185                             "Could not enable %s event",
 186                             acpi_ut_get_event_name(event)));
 187                 return_ACPI_STATUS(AE_NO_HARDWARE_RESPONSE);
 188         }
 189
 190         return_ACPI_STATUS(status);
 191 }
 192
 193 ACPI_EXPORT_SYMBOL(acpi_enable_event)
 194
 195 /*******************************************************************************
 196  *
 197  * FUNCTION:    acpi_set_gpe_type
 198  *
 199  * PARAMETERS:  gpe_device      - Parent GPE Device
 200  *              gpe_number      - GPE level within the GPE block
 201  *              Type            - New GPE type
 202  *
 203  * RETURN:      Status
 204  *
 205  * DESCRIPTION: Set the type of an individual GPE
 206  *
 207  ******************************************************************************/
 208 acpi_status acpi_set_gpe_type(acpi_handle gpe_device, u32 gpe_number, u8 type)
 209 {
 210         acpi_status status = AE_OK;
 211         struct acpi_gpe_event_info *gpe_event_info;
 212
 213         ACPI_FUNCTION_TRACE(acpi_set_gpe_type);
 214
 215         /* Ensure that we have a valid GPE number */
 216
 217         gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
 218         if (!gpe_event_info) {
 219                 status = AE_BAD_PARAMETER;
 220                 goto unlock_and_exit;
 221         }
 222
 223         if ((gpe_event_info->flags & ACPI_GPE_TYPE_MASK) == type) {
 224                 return_ACPI_STATUS(AE_OK);
 225         }
 226
 227         /* Set the new type (will disable GPE if currently enabled) */
 228
 229         status = acpi_ev_set_gpe_type(gpe_event_info, type);
 230
 231       unlock_and_exit:
 232         return_ACPI_STATUS(status);
 233 }
 234
 235 ACPI_EXPORT_SYMBOL(acpi_set_gpe_type)
 236
 237 /*******************************************************************************
 238  *
 239  * FUNCTION:    acpi_enable_gpe
 240  *
 241  * PARAMETERS:  gpe_device      - Parent GPE Device
 242  *              gpe_number      - GPE level within the GPE block
 243  *              Flags           - Just enable, or also wake enable?
 244  *                                Called from ISR or not
 245  *
 246  * RETURN:      Status
 247  *
 248  * DESCRIPTION: Enable an ACPI event (general purpose)
 249  *
 250  ******************************************************************************/
 251 acpi_status acpi_enable_gpe(acpi_handle gpe_device, u32 gpe_number, u32 flags)
 252 {
 253         acpi_status status = AE_OK;
 254         struct acpi_gpe_event_info *gpe_event_info;
 255
 256         ACPI_FUNCTION_TRACE(acpi_enable_gpe);
 257
 258         /* Use semaphore lock if not executing at interrupt level */
 259
 260         if (flags & ACPI_NOT_ISR) {
 261                 status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
 262                 if (ACPI_FAILURE(status)) {
 263                         return_ACPI_STATUS(status);
 264                 }
 265         }
 266
 267         /* Ensure that we have a valid GPE number */
 268
 269         gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
 270         if (!gpe_event_info) {
 271                 status = AE_BAD_PARAMETER;
 272                 goto unlock_and_exit;
 273         }
 274
 275         /* Perform the enable */
 276
 277         status = acpi_ev_enable_gpe(gpe_event_info, TRUE);
 278
 279       unlock_and_exit:
 280         if (flags & ACPI_NOT_ISR) {
 281                 (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
 282         }
 283         return_ACPI_STATUS(status);
 284 }
 285
 286 ACPI_EXPORT_SYMBOL(acpi_enable_gpe)
 287
 288 /*******************************************************************************
 289  *
 290  * FUNCTION:    acpi_disable_gpe
 291  *
 292  * PARAMETERS:  gpe_device      - Parent GPE Device
 293  *              gpe_number      - GPE level within the GPE block
 294  *              Flags           - Just disable, or also wake disable?
 295  *                                Called from ISR or not
 296  *
 297  * RETURN:      Status
 298  *
 299  * DESCRIPTION: Disable an ACPI event (general purpose)
 300  *
 301  ******************************************************************************/
 302 acpi_status acpi_disable_gpe(acpi_handle gpe_device, u32 gpe_number, u32 flags)
 303 {
 304         acpi_status status = AE_OK;
 305         struct acpi_gpe_event_info *gpe_event_info;
 306
 307         ACPI_FUNCTION_TRACE(acpi_disable_gpe);
 308
 309         /* Use semaphore lock if not executing at interrupt level */
 310
 311         if (flags & ACPI_NOT_ISR) {
 312                 status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
 313                 if (ACPI_FAILURE(status)) {
 314                         return_ACPI_STATUS(status);
 315                 }
 316         }
 317
 318         /* Ensure that we have a valid GPE number */
 319
 320         gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
 321         if (!gpe_event_info) {
 322                 status = AE_BAD_PARAMETER;
 323                 goto unlock_and_exit;
 324         }
 325
 326         status = acpi_ev_disable_gpe(gpe_event_info);
 327
 328       unlock_and_exit:
 329         if (flags & ACPI_NOT_ISR) {
 330                 (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
 331         }
 332         return_ACPI_STATUS(status);
 333 }
 334
 335 ACPI_EXPORT_SYMBOL(acpi_disable_gpe)
 336
 337 /*******************************************************************************
 338  *
 339  * FUNCTION:    acpi_disable_event
 340  *
 341  * PARAMETERS:  Event           - The fixed eventto be enabled
 342  *              Flags           - Reserved
 343  *
 344  * RETURN:      Status
 345  *
 346  * DESCRIPTION: Disable an ACPI event (fixed)
 347  *
 348  ******************************************************************************/
 349 acpi_status acpi_disable_event(u32 event, u32 flags)
 350 {
 351         acpi_status status = AE_OK;
 352         u32 value;
 353
 354         ACPI_FUNCTION_TRACE(acpi_disable_event);
 355
 356         /* Decode the Fixed Event */
 357
 358         if (event > ACPI_EVENT_MAX) {
 359                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 360         }
 361
 362         /*
 363          * Disable the requested fixed event (by writing a zero to the
 364          * enable register bit)
 365          */
 366         status =
 367             acpi_set_register(acpi_gbl_fixed_event_info[event].
 368                               enable_register_id, 0);
 369         if (ACPI_FAILURE(status)) {
 370                 return_ACPI_STATUS(status);
 371         }
 372
 373         status =
 374             acpi_get_register(acpi_gbl_fixed_event_info[event].
 375                               enable_register_id, &value);
 376         if (ACPI_FAILURE(status)) {
 377                 return_ACPI_STATUS(status);
 378         }
 379
 380         if (value != 0) {
 381                 ACPI_ERROR((AE_INFO,
 382                             "Could not disable %s events",
 383                             acpi_ut_get_event_name(event)));
 384                 return_ACPI_STATUS(AE_NO_HARDWARE_RESPONSE);
 385         }
 386
 387         return_ACPI_STATUS(status);
 388 }
 389
 390 ACPI_EXPORT_SYMBOL(acpi_disable_event)
 391
 392 /*******************************************************************************
 393  *
 394  * FUNCTION:    acpi_clear_event
 395  *
 396  * PARAMETERS:  Event           - The fixed event to be cleared
 397  *
 398  * RETURN:      Status
 399  *
 400  * DESCRIPTION: Clear an ACPI event (fixed)
 401  *
 402  ******************************************************************************/
 403 acpi_status acpi_clear_event(u32 event)
 404 {
 405         acpi_status status = AE_OK;
 406
 407         ACPI_FUNCTION_TRACE(acpi_clear_event);
 408
 409         /* Decode the Fixed Event */
 410
 411         if (event > ACPI_EVENT_MAX) {
 412                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 413         }
 414
 415         /*
 416          * Clear the requested fixed event (By writing a one to the
 417          * status register bit)
 418          */
 419         status =
 420             acpi_set_register(acpi_gbl_fixed_event_info[event].
 421                               status_register_id, 1);
 422
 423         return_ACPI_STATUS(status);
 424 }
 425
 426 ACPI_EXPORT_SYMBOL(acpi_clear_event)
 427
 428 /*******************************************************************************
 429  *
 430  * FUNCTION:    acpi_clear_gpe
 431  *
 432  * PARAMETERS:  gpe_device      - Parent GPE Device
 433  *              gpe_number      - GPE level within the GPE block
 434  *              Flags           - Called from an ISR or not
 435  *
 436  * RETURN:      Status
 437  *
 438  * DESCRIPTION: Clear an ACPI event (general purpose)
 439  *
 440  ******************************************************************************/
 441 acpi_status acpi_clear_gpe(acpi_handle gpe_device, u32 gpe_number, u32 flags)
 442 {
 443         acpi_status status = AE_OK;
 444         struct acpi_gpe_event_info *gpe_event_info;
 445
 446         ACPI_FUNCTION_TRACE(acpi_clear_gpe);
 447
 448         /* Use semaphore lock if not executing at interrupt level */
 449
 450         if (flags & ACPI_NOT_ISR) {
 451                 status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
 452                 if (ACPI_FAILURE(status)) {
 453                         return_ACPI_STATUS(status);
 454                 }
 455         }
 456
 457         /* Ensure that we have a valid GPE number */
 458
 459         gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
 460         if (!gpe_event_info) {
 461                 status = AE_BAD_PARAMETER;
 462                 goto unlock_and_exit;
 463         }
 464
 465         status = acpi_hw_clear_gpe(gpe_event_info);
 466
 467       unlock_and_exit:
 468         if (flags & ACPI_NOT_ISR) {
 469                 (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
 470         }
 471         return_ACPI_STATUS(status);
 472 }
 473
 474 ACPI_EXPORT_SYMBOL(acpi_clear_gpe)
 475 #ifdef ACPI_FUTURE_USAGE
 476 /*******************************************************************************
 477  *
 478  * FUNCTION:    acpi_get_event_status
 479  *
 480  * PARAMETERS:  Event           - The fixed event
 481  *              event_status    - Where the current status of the event will
 482  *                                be returned
 483  *
 484  * RETURN:      Status
 485  *
 486  * DESCRIPTION: Obtains and returns the current status of the event
 487  *
 488  ******************************************************************************/
 489 acpi_status acpi_get_event_status(u32 event, acpi_event_status * event_status)
 490 {
 491         acpi_status status = AE_OK;
 492
 493         ACPI_FUNCTION_TRACE(acpi_get_event_status);
 494
 495         if (!event_status) {
 496                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 497         }
 498
 499         /* Decode the Fixed Event */
 500
 501         if (event > ACPI_EVENT_MAX) {
 502                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 503         }
 504
 505         /* Get the status of the requested fixed event */
 506
 507         status =
 508             acpi_get_register(acpi_gbl_fixed_event_info[event].
 509                               status_register_id, event_status);
 510
 511         return_ACPI_STATUS(status);
 512 }
 513
 514 ACPI_EXPORT_SYMBOL(acpi_get_event_status)
 515
 516 /*******************************************************************************
 517  *
 518  * FUNCTION:    acpi_get_gpe_status
 519  *
 520  * PARAMETERS:  gpe_device      - Parent GPE Device
 521  *              gpe_number      - GPE level within the GPE block
 522  *              Flags           - Called from an ISR or not
 523  *              event_status    - Where the current status of the event will
 524  *                                be returned
 525  *
 526  * RETURN:      Status
 527  *
 528  * DESCRIPTION: Get status of an event (general purpose)
 529  *
 530  ******************************************************************************/
 531 acpi_status
 532 acpi_get_gpe_status(acpi_handle gpe_device,
 533                     u32 gpe_number, u32 flags, acpi_event_status * event_status)
 534 {
 535         acpi_status status = AE_OK;
 536         struct acpi_gpe_event_info *gpe_event_info;
 537
 538         ACPI_FUNCTION_TRACE(acpi_get_gpe_status);
 539
 540         /* Use semaphore lock if not executing at interrupt level */
 541
 542         if (flags & ACPI_NOT_ISR) {
 543                 status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
 544                 if (ACPI_FAILURE(status)) {
 545                         return_ACPI_STATUS(status);
 546                 }
 547         }
 548
 549         /* Ensure that we have a valid GPE number */
 550
 551         gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
 552         if (!gpe_event_info) {
 553                 status = AE_BAD_PARAMETER;
 554                 goto unlock_and_exit;
 555         }
 556
 557         /* Obtain status on the requested GPE number */
 558
 559         status = acpi_hw_get_gpe_status(gpe_event_info, event_status);
 560
 561       unlock_and_exit:
 562         if (flags & ACPI_NOT_ISR) {
 563                 (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
 564         }
 565         return_ACPI_STATUS(status);
 566 }
 567
 568 ACPI_EXPORT_SYMBOL(acpi_get_gpe_status)
 569 #endif                          /*  ACPI_FUTURE_USAGE  */
 570 /*******************************************************************************
 571  *
 572  * FUNCTION:    acpi_install_gpe_block
 573  *
 574  * PARAMETERS:  gpe_device          - Handle to the parent GPE Block Device
 575  *              gpe_block_address   - Address and space_iD
 576  *              register_count      - Number of GPE register pairs in the block
 577  *              interrupt_number    - H/W interrupt for the block
 578  *
 579  * RETURN:      Status
 580  *
 581  * DESCRIPTION: Create and Install a block of GPE registers
 582  *
 583  ******************************************************************************/
 584 acpi_status
 585 acpi_install_gpe_block(acpi_handle gpe_device,
 586                        struct acpi_generic_address *gpe_block_address,
 587                        u32 register_count, u32 interrupt_number)
 588 {
 589         acpi_status status;
 590         union acpi_operand_object *obj_desc;
 591         struct acpi_namespace_node *node;
 592         struct acpi_gpe_block_info *gpe_block;
 593
 594         ACPI_FUNCTION_TRACE(acpi_install_gpe_block);
 595
 596         if ((!gpe_device) || (!gpe_block_address) || (!register_count)) {
 597                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 598         }
 599
 600         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
 601         if (ACPI_FAILURE(status)) {
 602                 return (status);
 603         }
 604
 605         node = acpi_ns_map_handle_to_node(gpe_device);
 606         if (!node) {
 607                 status = AE_BAD_PARAMETER;
 608                 goto unlock_and_exit;
 609         }
 610
 611         /*
 612          * For user-installed GPE Block Devices, the gpe_block_base_number
 613          * is always zero
 614          */
 615         status =
 616             acpi_ev_create_gpe_block(node, gpe_block_address, register_count, 0,
 617                                      interrupt_number, &gpe_block);
 618         if (ACPI_FAILURE(status)) {
 619                 goto unlock_and_exit;
 620         }
 621
 622         /* Run the _PRW methods and enable the GPEs */
 623
 624         status = acpi_ev_initialize_gpe_block(node, gpe_block);
 625         if (ACPI_FAILURE(status)) {
 626                 goto unlock_and_exit;
 627         }
 628
 629         /* Get the device_object attached to the node */
 630
 631         obj_desc = acpi_ns_get_attached_object(node);
 632         if (!obj_desc) {
 633
 634                 /* No object, create a new one */
 635
 636                 obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_DEVICE);
 637                 if (!obj_desc) {
 638                         status = AE_NO_MEMORY;
 639                         goto unlock_and_exit;
 640                 }
 641
 642                 status =
 643                     acpi_ns_attach_object(node, obj_desc, ACPI_TYPE_DEVICE);
 644
 645                 /* Remove local reference to the object */
 646
 647                 acpi_ut_remove_reference(obj_desc);
 648
 649                 if (ACPI_FAILURE(status)) {
 650                         goto unlock_and_exit;
 651                 }
 652         }
 653
 654         /* Install the GPE block in the device_object */
 655
 656         obj_desc->device.gpe_block = gpe_block;
 657
 658       unlock_and_exit:
 659         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 660         return_ACPI_STATUS(status);
 661 }
 662
 663 ACPI_EXPORT_SYMBOL(acpi_install_gpe_block)
 664
 665 /*******************************************************************************
 666  *
 667  * FUNCTION:    acpi_remove_gpe_block
 668  *
 669  * PARAMETERS:  gpe_device          - Handle to the parent GPE Block Device
 670  *
 671  * RETURN:      Status
 672  *
 673  * DESCRIPTION: Remove a previously installed block of GPE registers
 674  *
 675  ******************************************************************************/
 676 acpi_status acpi_remove_gpe_block(acpi_handle gpe_device)
 677 {
 678         union acpi_operand_object *obj_desc;
 679         acpi_status status;
 680         struct acpi_namespace_node *node;
 681
 682         ACPI_FUNCTION_TRACE(acpi_remove_gpe_block);
 683
 684         if (!gpe_device) {
 685                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 686         }
 687
 688         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
 689         if (ACPI_FAILURE(status)) {
 690                 return (status);
 691         }
 692
 693         node = acpi_ns_map_handle_to_node(gpe_device);
 694         if (!node) {
 695                 status = AE_BAD_PARAMETER;
 696                 goto unlock_and_exit;
 697         }
 698
 699         /* Get the device_object attached to the node */
 700
 701         obj_desc = acpi_ns_get_attached_object(node);
 702         if (!obj_desc || !obj_desc->device.gpe_block) {
 703                 return_ACPI_STATUS(AE_NULL_OBJECT);
 704         }
 705
 706         /* Delete the GPE block (but not the device_object) */
 707
 708         status = acpi_ev_delete_gpe_block(obj_desc->device.gpe_block);
 709         if (ACPI_SUCCESS(status)) {
 710                 obj_desc->device.gpe_block = NULL;
 711         }
 712
 713       unlock_and_exit:
 714         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 715         return_ACPI_STATUS(status);
 716 }
 717
 718 ACPI_EXPORT_SYMBOL(acpi_remove_gpe_block)