git.oblomov.eu Git - linux-2.6/blob - 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 - 2008, Intel Corp.
   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)
 252 {
 253         acpi_status status = AE_OK;
 254         acpi_cpu_flags flags;
 255         struct acpi_gpe_event_info *gpe_event_info;
 256
 257         ACPI_FUNCTION_TRACE(acpi_enable_gpe);
 258
 259         flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
 260
 261         /* Ensure that we have a valid GPE number */
 262
 263         gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
 264         if (!gpe_event_info) {
 265                 status = AE_BAD_PARAMETER;
 266                 goto unlock_and_exit;
 267         }
 268
 269         /* Perform the enable */
 270
 271         status = acpi_ev_enable_gpe(gpe_event_info, TRUE);
 272
 273       unlock_and_exit:
 274         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 275         return_ACPI_STATUS(status);
 276 }
 277
 278 ACPI_EXPORT_SYMBOL(acpi_enable_gpe)
 279
 280 /*******************************************************************************
 281  *
 282  * FUNCTION:    acpi_disable_gpe
 283  *
 284  * PARAMETERS:  gpe_device      - Parent GPE Device
 285  *              gpe_number      - GPE level within the GPE block
 286  *              Flags           - Just disable, or also wake disable?
 287  *                                Called from ISR or not
 288  *
 289  * RETURN:      Status
 290  *
 291  * DESCRIPTION: Disable an ACPI event (general purpose)
 292  *
 293  ******************************************************************************/
 294 acpi_status acpi_disable_gpe(acpi_handle gpe_device, u32 gpe_number)
 295 {
 296         acpi_status status = AE_OK;
 297         acpi_cpu_flags flags;
 298         struct acpi_gpe_event_info *gpe_event_info;
 299
 300         ACPI_FUNCTION_TRACE(acpi_disable_gpe);
 301
 302         flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
 303         /* Ensure that we have a valid GPE number */
 304
 305         gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
 306         if (!gpe_event_info) {
 307                 status = AE_BAD_PARAMETER;
 308                 goto unlock_and_exit;
 309         }
 310
 311         status = acpi_ev_disable_gpe(gpe_event_info);
 312
 313 unlock_and_exit:
 314         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 315         return_ACPI_STATUS(status);
 316 }
 317
 318 ACPI_EXPORT_SYMBOL(acpi_disable_gpe)
 319
 320 /*******************************************************************************
 321  *
 322  * FUNCTION:    acpi_disable_event
 323  *
 324  * PARAMETERS:  Event           - The fixed eventto be enabled
 325  *              Flags           - Reserved
 326  *
 327  * RETURN:      Status
 328  *
 329  * DESCRIPTION: Disable an ACPI event (fixed)
 330  *
 331  ******************************************************************************/
 332 acpi_status acpi_disable_event(u32 event, u32 flags)
 333 {
 334         acpi_status status = AE_OK;
 335         u32 value;
 336
 337         ACPI_FUNCTION_TRACE(acpi_disable_event);
 338
 339         /* Decode the Fixed Event */
 340
 341         if (event > ACPI_EVENT_MAX) {
 342                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 343         }
 344
 345         /*
 346          * Disable the requested fixed event (by writing a zero to the
 347          * enable register bit)
 348          */
 349         status =
 350             acpi_set_register(acpi_gbl_fixed_event_info[event].
 351                               enable_register_id, 0);
 352         if (ACPI_FAILURE(status)) {
 353                 return_ACPI_STATUS(status);
 354         }
 355
 356         status =
 357             acpi_get_register(acpi_gbl_fixed_event_info[event].
 358                               enable_register_id, &value);
 359         if (ACPI_FAILURE(status)) {
 360                 return_ACPI_STATUS(status);
 361         }
 362
 363         if (value != 0) {
 364                 ACPI_ERROR((AE_INFO,
 365                             "Could not disable %s events",
 366                             acpi_ut_get_event_name(event)));
 367                 return_ACPI_STATUS(AE_NO_HARDWARE_RESPONSE);
 368         }
 369
 370         return_ACPI_STATUS(status);
 371 }
 372
 373 ACPI_EXPORT_SYMBOL(acpi_disable_event)
 374
 375 /*******************************************************************************
 376  *
 377  * FUNCTION:    acpi_clear_event
 378  *
 379  * PARAMETERS:  Event           - The fixed event to be cleared
 380  *
 381  * RETURN:      Status
 382  *
 383  * DESCRIPTION: Clear an ACPI event (fixed)
 384  *
 385  ******************************************************************************/
 386 acpi_status acpi_clear_event(u32 event)
 387 {
 388         acpi_status status = AE_OK;
 389
 390         ACPI_FUNCTION_TRACE(acpi_clear_event);
 391
 392         /* Decode the Fixed Event */
 393
 394         if (event > ACPI_EVENT_MAX) {
 395                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 396         }
 397
 398         /*
 399          * Clear the requested fixed event (By writing a one to the
 400          * status register bit)
 401          */
 402         status =
 403             acpi_set_register(acpi_gbl_fixed_event_info[event].
 404                               status_register_id, 1);
 405
 406         return_ACPI_STATUS(status);
 407 }
 408
 409 ACPI_EXPORT_SYMBOL(acpi_clear_event)
 410
 411 /*******************************************************************************
 412  *
 413  * FUNCTION:    acpi_clear_gpe
 414  *
 415  * PARAMETERS:  gpe_device      - Parent GPE Device
 416  *              gpe_number      - GPE level within the GPE block
 417  *              Flags           - Called from an ISR or not
 418  *
 419  * RETURN:      Status
 420  *
 421  * DESCRIPTION: Clear an ACPI event (general purpose)
 422  *
 423  ******************************************************************************/
 424 acpi_status acpi_clear_gpe(acpi_handle gpe_device, u32 gpe_number, u32 flags)
 425 {
 426         acpi_status status = AE_OK;
 427         struct acpi_gpe_event_info *gpe_event_info;
 428
 429         ACPI_FUNCTION_TRACE(acpi_clear_gpe);
 430
 431         /* Use semaphore lock if not executing at interrupt level */
 432
 433         if (flags & ACPI_NOT_ISR) {
 434                 status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
 435                 if (ACPI_FAILURE(status)) {
 436                         return_ACPI_STATUS(status);
 437                 }
 438         }
 439
 440         /* Ensure that we have a valid GPE number */
 441
 442         gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
 443         if (!gpe_event_info) {
 444                 status = AE_BAD_PARAMETER;
 445                 goto unlock_and_exit;
 446         }
 447
 448         status = acpi_hw_clear_gpe(gpe_event_info);
 449
 450       unlock_and_exit:
 451         if (flags & ACPI_NOT_ISR) {
 452                 (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
 453         }
 454         return_ACPI_STATUS(status);
 455 }
 456
 457 ACPI_EXPORT_SYMBOL(acpi_clear_gpe)
 458 /*******************************************************************************
 459  *
 460  * FUNCTION:    acpi_get_event_status
 461  *
 462  * PARAMETERS:  Event           - The fixed event
 463  *              event_status    - Where the current status of the event will
 464  *                                be returned
 465  *
 466  * RETURN:      Status
 467  *
 468  * DESCRIPTION: Obtains and returns the current status of the event
 469  *
 470  ******************************************************************************/
 471 acpi_status acpi_get_event_status(u32 event, acpi_event_status * event_status)
 472 {
 473         acpi_status status = AE_OK;
 474         u32 value;
 475
 476         ACPI_FUNCTION_TRACE(acpi_get_event_status);
 477
 478         if (!event_status) {
 479                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 480         }
 481
 482         /* Decode the Fixed Event */
 483
 484         if (event > ACPI_EVENT_MAX) {
 485                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 486         }
 487
 488         /* Get the status of the requested fixed event */
 489
 490         status =
 491             acpi_get_register(acpi_gbl_fixed_event_info[event].
 492                               enable_register_id, &value);
 493         if (ACPI_FAILURE(status))
 494                 return_ACPI_STATUS(status);
 495
 496         *event_status = value;
 497
 498         status =
 499             acpi_get_register(acpi_gbl_fixed_event_info[event].
 500                               status_register_id, &value);
 501         if (ACPI_FAILURE(status))
 502                 return_ACPI_STATUS(status);
 503
 504         if (value)
 505                 *event_status |= ACPI_EVENT_FLAG_SET;
 506
 507         if (acpi_gbl_fixed_event_handlers[event].handler)
 508                 *event_status |= ACPI_EVENT_FLAG_HANDLE;
 509
 510         return_ACPI_STATUS(status);
 511 }
 512
 513 ACPI_EXPORT_SYMBOL(acpi_get_event_status)
 514
 515 /*******************************************************************************
 516  *
 517  * FUNCTION:    acpi_get_gpe_status
 518  *
 519  * PARAMETERS:  gpe_device      - Parent GPE Device
 520  *              gpe_number      - GPE level within the GPE block
 521  *              Flags           - Called from an ISR or not
 522  *              event_status    - Where the current status of the event will
 523  *                                be returned
 524  *
 525  * RETURN:      Status
 526  *
 527  * DESCRIPTION: Get status of an event (general purpose)
 528  *
 529  ******************************************************************************/
 530 acpi_status
 531 acpi_get_gpe_status(acpi_handle gpe_device,
 532                     u32 gpe_number, u32 flags, acpi_event_status * event_status)
 533 {
 534         acpi_status status = AE_OK;
 535         struct acpi_gpe_event_info *gpe_event_info;
 536
 537         ACPI_FUNCTION_TRACE(acpi_get_gpe_status);
 538
 539         /* Use semaphore lock if not executing at interrupt level */
 540
 541         if (flags & ACPI_NOT_ISR) {
 542                 status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
 543                 if (ACPI_FAILURE(status)) {
 544                         return_ACPI_STATUS(status);
 545                 }
 546         }
 547
 548         /* Ensure that we have a valid GPE number */
 549
 550         gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
 551         if (!gpe_event_info) {
 552                 status = AE_BAD_PARAMETER;
 553                 goto unlock_and_exit;
 554         }
 555
 556         /* Obtain status on the requested GPE number */
 557
 558         status = acpi_hw_get_gpe_status(gpe_event_info, event_status);
 559
 560         if (gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK)
 561                 *event_status |= ACPI_EVENT_FLAG_HANDLE;
 562
 563       unlock_and_exit:
 564         if (flags & ACPI_NOT_ISR) {
 565                 (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
 566         }
 567         return_ACPI_STATUS(status);
 568 }
 569
 570 ACPI_EXPORT_SYMBOL(acpi_get_gpe_status)
 571 /*******************************************************************************
 572  *
 573  * FUNCTION:    acpi_install_gpe_block
 574  *
 575  * PARAMETERS:  gpe_device          - Handle to the parent GPE Block Device
 576  *              gpe_block_address   - Address and space_iD
 577  *              register_count      - Number of GPE register pairs in the block
 578  *              interrupt_number    - H/W interrupt for the block
 579  *
 580  * RETURN:      Status
 581  *
 582  * DESCRIPTION: Create and Install a block of GPE registers
 583  *
 584  ******************************************************************************/
 585 acpi_status
 586 acpi_install_gpe_block(acpi_handle gpe_device,
 587                        struct acpi_generic_address *gpe_block_address,
 588                        u32 register_count, u32 interrupt_number)
 589 {
 590         acpi_status status;
 591         union acpi_operand_object *obj_desc;
 592         struct acpi_namespace_node *node;
 593         struct acpi_gpe_block_info *gpe_block;
 594
 595         ACPI_FUNCTION_TRACE(acpi_install_gpe_block);
 596
 597         if ((!gpe_device) || (!gpe_block_address) || (!register_count)) {
 598                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 599         }
 600
 601         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
 602         if (ACPI_FAILURE(status)) {
 603                 return (status);
 604         }
 605
 606         node = acpi_ns_map_handle_to_node(gpe_device);
 607         if (!node) {
 608                 status = AE_BAD_PARAMETER;
 609                 goto unlock_and_exit;
 610         }
 611
 612         /*
 613          * For user-installed GPE Block Devices, the gpe_block_base_number
 614          * is always zero
 615          */
 616         status =
 617             acpi_ev_create_gpe_block(node, gpe_block_address, register_count, 0,
 618                                      interrupt_number, &gpe_block);
 619         if (ACPI_FAILURE(status)) {
 620                 goto unlock_and_exit;
 621         }
 622
 623         /* Run the _PRW methods and enable the GPEs */
 624
 625         status = acpi_ev_initialize_gpe_block(node, gpe_block);
 626         if (ACPI_FAILURE(status)) {
 627                 goto unlock_and_exit;
 628         }
 629
 630         /* Get the device_object attached to the node */
 631
 632         obj_desc = acpi_ns_get_attached_object(node);
 633         if (!obj_desc) {
 634
 635                 /* No object, create a new one */
 636
 637                 obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_DEVICE);
 638                 if (!obj_desc) {
 639                         status = AE_NO_MEMORY;
 640                         goto unlock_and_exit;
 641                 }
 642
 643                 status =
 644                     acpi_ns_attach_object(node, obj_desc, ACPI_TYPE_DEVICE);
 645
 646                 /* Remove local reference to the object */
 647
 648                 acpi_ut_remove_reference(obj_desc);
 649
 650                 if (ACPI_FAILURE(status)) {
 651                         goto unlock_and_exit;
 652                 }
 653         }
 654
 655         /* Install the GPE block in the device_object */
 656
 657         obj_desc->device.gpe_block = gpe_block;
 658
 659       unlock_and_exit:
 660         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 661         return_ACPI_STATUS(status);
 662 }
 663
 664 ACPI_EXPORT_SYMBOL(acpi_install_gpe_block)
 665
 666 /*******************************************************************************
 667  *
 668  * FUNCTION:    acpi_remove_gpe_block
 669  *
 670  * PARAMETERS:  gpe_device          - Handle to the parent GPE Block Device
 671  *
 672  * RETURN:      Status
 673  *
 674  * DESCRIPTION: Remove a previously installed block of GPE registers
 675  *
 676  ******************************************************************************/
 677 acpi_status acpi_remove_gpe_block(acpi_handle gpe_device)
 678 {
 679         union acpi_operand_object *obj_desc;
 680         acpi_status status;
 681         struct acpi_namespace_node *node;
 682
 683         ACPI_FUNCTION_TRACE(acpi_remove_gpe_block);
 684
 685         if (!gpe_device) {
 686                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 687         }
 688
 689         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
 690         if (ACPI_FAILURE(status)) {
 691                 return (status);
 692         }
 693
 694         node = acpi_ns_map_handle_to_node(gpe_device);
 695         if (!node) {
 696                 status = AE_BAD_PARAMETER;
 697                 goto unlock_and_exit;
 698         }
 699
 700         /* Get the device_object attached to the node */
 701
 702         obj_desc = acpi_ns_get_attached_object(node);
 703         if (!obj_desc || !obj_desc->device.gpe_block) {
 704                 return_ACPI_STATUS(AE_NULL_OBJECT);
 705         }
 706
 707         /* Delete the GPE block (but not the device_object) */
 708
 709         status = acpi_ev_delete_gpe_block(obj_desc->device.gpe_block);
 710         if (ACPI_SUCCESS(status)) {
 711                 obj_desc->device.gpe_block = NULL;
 712         }
 713
 714       unlock_and_exit:
 715         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 716         return_ACPI_STATUS(status);
 717 }
 718
 719 ACPI_EXPORT_SYMBOL(acpi_remove_gpe_block)