drivers/acpi/acpica/evxfgpe.c

   1 /******************************************************************************
   2  *
   3  * Module Name: evxfgpe - External Interfaces for General Purpose Events (GPEs)
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2011, 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 "accommon.h"
  46 #include "acevents.h"
  47 #include "acnamesp.h"
  48
  49 #define _COMPONENT          ACPI_EVENTS
  50 ACPI_MODULE_NAME("evxfgpe")
  51
  52 /******************************************************************************
  53  *
  54  * FUNCTION:    acpi_update_all_gpes
  55  *
  56  * PARAMETERS:  None
  57  *
  58  * RETURN:      Status
  59  *
  60  * DESCRIPTION: Complete GPE initialization and enable all GPEs that have
  61  *              associated _Lxx or _Exx methods and are not pointed to by any
  62  *              device _PRW methods (this indicates that these GPEs are
  63  *              generally intended for system or device wakeup. Such GPEs
  64  *              have to be enabled directly when the devices whose _PRW
  65  *              methods point to them are set up for wakeup signaling.)
  66  *
  67  * NOTE: Should be called after any GPEs are added to the system. Primarily,
  68  * after the system _PRW methods have been run, but also after a GPE Block
  69  * Device has been added or if any new GPE methods have been added via a
  70  * dynamic table load.
  71  *
  72  ******************************************************************************/
  73
  74 acpi_status acpi_update_all_gpes(void)
  75 {
  76         acpi_status status;
  77
  78         ACPI_FUNCTION_TRACE(acpi_update_all_gpes);
  79
  80         status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
  81         if (ACPI_FAILURE(status)) {
  82                 return_ACPI_STATUS(status);
  83         }
  84
  85         if (acpi_gbl_all_gpes_initialized) {
  86                 goto unlock_and_exit;
  87         }
  88
  89         status = acpi_ev_walk_gpe_list(acpi_ev_initialize_gpe_block, NULL);
  90         if (ACPI_SUCCESS(status)) {
  91                 acpi_gbl_all_gpes_initialized = TRUE;
  92         }
  93
  94 unlock_and_exit:
  95         (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
  96
  97         return_ACPI_STATUS(status);
  98 }
  99
 100 ACPI_EXPORT_SYMBOL(acpi_update_all_gpes)
 101
 102 /*******************************************************************************
 103  *
 104  * FUNCTION:    acpi_enable_gpe
 105  *
 106  * PARAMETERS:  gpe_device      - Parent GPE Device. NULL for GPE0/GPE1
 107  *              gpe_number      - GPE level within the GPE block
 108  *
 109  * RETURN:      Status
 110  *
 111  * DESCRIPTION: Add a reference to a GPE. On the first reference, the GPE is
 112  *              hardware-enabled.
 113  *
 114  ******************************************************************************/
 115
 116 acpi_status acpi_enable_gpe(acpi_handle gpe_device, u32 gpe_number)
 117 {
 118         acpi_status status = AE_BAD_PARAMETER;
 119         struct acpi_gpe_event_info *gpe_event_info;
 120         acpi_cpu_flags flags;
 121
 122         ACPI_FUNCTION_TRACE(acpi_enable_gpe);
 123
 124         flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
 125
 126         /* Ensure that we have a valid GPE number */
 127
 128         gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
 129         if (gpe_event_info) {
 130                 status = acpi_ev_add_gpe_reference(gpe_event_info);
 131         }
 132
 133         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 134         return_ACPI_STATUS(status);
 135 }
 136 ACPI_EXPORT_SYMBOL(acpi_enable_gpe)
 137
 138 /*******************************************************************************
 139  *
 140  * FUNCTION:    acpi_disable_gpe
 141  *
 142  * PARAMETERS:  gpe_device      - Parent GPE Device. NULL for GPE0/GPE1
 143  *              gpe_number      - GPE level within the GPE block
 144  *
 145  * RETURN:      Status
 146  *
 147  * DESCRIPTION: Remove a reference to a GPE. When the last reference is
 148  *              removed, only then is the GPE disabled (for runtime GPEs), or
 149  *              the GPE mask bit disabled (for wake GPEs)
 150  *
 151  ******************************************************************************/
 152
 153 acpi_status acpi_disable_gpe(acpi_handle gpe_device, u32 gpe_number)
 154 {
 155         acpi_status status = AE_BAD_PARAMETER;
 156         struct acpi_gpe_event_info *gpe_event_info;
 157         acpi_cpu_flags flags;
 158
 159         ACPI_FUNCTION_TRACE(acpi_disable_gpe);
 160
 161         flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
 162
 163         /* Ensure that we have a valid GPE number */
 164
 165         gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
 166         if (gpe_event_info) {
 167                 status = acpi_ev_remove_gpe_reference(gpe_event_info) ;
 168         }
 169
 170         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 171         return_ACPI_STATUS(status);
 172 }
 173 ACPI_EXPORT_SYMBOL(acpi_disable_gpe)
 174
 175
 176 /*******************************************************************************
 177  *
 178  * FUNCTION:    acpi_setup_gpe_for_wake
 179  *
 180  * PARAMETERS:  wake_device         - Device associated with the GPE (via _PRW)
 181  *              gpe_device          - Parent GPE Device. NULL for GPE0/GPE1
 182  *              gpe_number          - GPE level within the GPE block
 183  *
 184  * RETURN:      Status
 185  *
 186  * DESCRIPTION: Mark a GPE as having the ability to wake the system. This
 187  *              interface is intended to be used as the host executes the
 188  *              _PRW methods (Power Resources for Wake) in the system tables.
 189  *              Each _PRW appears under a Device Object (The wake_device), and
 190  *              contains the info for the wake GPE associated with the
 191  *              wake_device.
 192  *
 193  ******************************************************************************/
 194 acpi_status
 195 acpi_setup_gpe_for_wake(acpi_handle wake_device,
 196                         acpi_handle gpe_device, u32 gpe_number)
 197 {
 198         acpi_status status = AE_BAD_PARAMETER;
 199         struct acpi_gpe_event_info *gpe_event_info;
 200         struct acpi_namespace_node *device_node;
 201         struct acpi_gpe_notify_object *notify_object;
 202         acpi_cpu_flags flags;
 203         u8 gpe_dispatch_mask;
 204
 205         ACPI_FUNCTION_TRACE(acpi_setup_gpe_for_wake);
 206
 207         /* Parameter Validation */
 208
 209         if (!wake_device) {
 210                 /*
 211                  * By forcing wake_device to be valid, we automatically enable the
 212                  * implicit notify feature on all hosts.
 213                  */
 214                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 215         }
 216
 217         flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
 218
 219         /* Ensure that we have a valid GPE number */
 220
 221         gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
 222         if (!gpe_event_info) {
 223                 goto unlock_and_exit;
 224         }
 225
 226         if (wake_device == ACPI_ROOT_OBJECT) {
 227                 goto out;
 228         }
 229
 230         /*
 231          * If there is no method or handler for this GPE, then the
 232          * wake_device will be notified whenever this GPE fires (aka
 233          * "implicit notify") Note: The GPE is assumed to be
 234          * level-triggered (for windows compatibility).
 235          */
 236         gpe_dispatch_mask = gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK;
 237         if (gpe_dispatch_mask != ACPI_GPE_DISPATCH_NONE
 238             && gpe_dispatch_mask != ACPI_GPE_DISPATCH_NOTIFY) {
 239                 goto out;
 240         }
 241
 242         /* Validate wake_device is of type Device */
 243
 244         device_node = ACPI_CAST_PTR(struct acpi_namespace_node, wake_device);
 245         if (device_node->type != ACPI_TYPE_DEVICE) {
 246                 goto unlock_and_exit;
 247         }
 248
 249         if (gpe_dispatch_mask == ACPI_GPE_DISPATCH_NONE) {
 250                 gpe_event_info->flags = (ACPI_GPE_DISPATCH_NOTIFY |
 251                                          ACPI_GPE_LEVEL_TRIGGERED);
 252                 gpe_event_info->dispatch.device.node = device_node;
 253                 gpe_event_info->dispatch.device.next = NULL;
 254         } else {
 255                 /* There are multiple devices to notify implicitly. */
 256
 257                 notify_object = ACPI_ALLOCATE_ZEROED(sizeof(*notify_object));
 258                 if (!notify_object) {
 259                         status = AE_NO_MEMORY;
 260                         goto unlock_and_exit;
 261                 }
 262
 263                 notify_object->node = device_node;
 264                 notify_object->next = gpe_event_info->dispatch.device.next;
 265                 gpe_event_info->dispatch.device.next = notify_object;
 266         }
 267
 268  out:
 269         gpe_event_info->flags |= ACPI_GPE_CAN_WAKE;
 270         status = AE_OK;
 271
 272  unlock_and_exit:
 273         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 274         return_ACPI_STATUS(status);
 275 }
 276 ACPI_EXPORT_SYMBOL(acpi_setup_gpe_for_wake)
 277
 278 /*******************************************************************************
 279  *
 280  * FUNCTION:    acpi_set_gpe_wake_mask
 281  *
 282  * PARAMETERS:  gpe_device      - Parent GPE Device. NULL for GPE0/GPE1
 283  *              gpe_number      - GPE level within the GPE block
 284  *              Action          - Enable or Disable
 285  *
 286  * RETURN:      Status
 287  *
 288  * DESCRIPTION: Set or clear the GPE's wakeup enable mask bit. The GPE must
 289  *              already be marked as a WAKE GPE.
 290  *
 291  ******************************************************************************/
 292
 293 acpi_status acpi_set_gpe_wake_mask(acpi_handle gpe_device, u32 gpe_number, u8 action)
 294 {
 295         acpi_status status = AE_OK;
 296         struct acpi_gpe_event_info *gpe_event_info;
 297         struct acpi_gpe_register_info *gpe_register_info;
 298         acpi_cpu_flags flags;
 299         u32 register_bit;
 300
 301         ACPI_FUNCTION_TRACE(acpi_set_gpe_wake_mask);
 302
 303         flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
 304
 305         /*
 306          * Ensure that we have a valid GPE number and that this GPE is in
 307          * fact a wake GPE
 308          */
 309         gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
 310         if (!gpe_event_info) {
 311                 status = AE_BAD_PARAMETER;
 312                 goto unlock_and_exit;
 313         }
 314
 315         if (!(gpe_event_info->flags & ACPI_GPE_CAN_WAKE)) {
 316                 status = AE_TYPE;
 317                 goto unlock_and_exit;
 318         }
 319
 320         gpe_register_info = gpe_event_info->register_info;
 321         if (!gpe_register_info) {
 322                 status = AE_NOT_EXIST;
 323                 goto unlock_and_exit;
 324         }
 325
 326         register_bit =
 327             acpi_hw_get_gpe_register_bit(gpe_event_info, gpe_register_info);
 328
 329         /* Perform the action */
 330
 331         switch (action) {
 332         case ACPI_GPE_ENABLE:
 333                 ACPI_SET_BIT(gpe_register_info->enable_for_wake,
 334                              (u8)register_bit);
 335                 break;
 336
 337         case ACPI_GPE_DISABLE:
 338                 ACPI_CLEAR_BIT(gpe_register_info->enable_for_wake,
 339                                (u8)register_bit);
 340                 break;
 341
 342         default:
 343                 ACPI_ERROR((AE_INFO, "%u, Invalid action", action));
 344                 status = AE_BAD_PARAMETER;
 345                 break;
 346         }
 347
 348 unlock_and_exit:
 349         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 350         return_ACPI_STATUS(status);
 351 }
 352
 353 ACPI_EXPORT_SYMBOL(acpi_set_gpe_wake_mask)
 354
 355 /*******************************************************************************
 356  *
 357  * FUNCTION:    acpi_clear_gpe
 358  *
 359  * PARAMETERS:  gpe_device      - Parent GPE Device. NULL for GPE0/GPE1
 360  *              gpe_number      - GPE level within the GPE block
 361  *
 362  * RETURN:      Status
 363  *
 364  * DESCRIPTION: Clear an ACPI event (general purpose)
 365  *
 366  ******************************************************************************/
 367 acpi_status acpi_clear_gpe(acpi_handle gpe_device, u32 gpe_number)
 368 {
 369         acpi_status status = AE_OK;
 370         struct acpi_gpe_event_info *gpe_event_info;
 371         acpi_cpu_flags flags;
 372
 373         ACPI_FUNCTION_TRACE(acpi_clear_gpe);
 374
 375         flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
 376
 377         /* Ensure that we have a valid GPE number */
 378
 379         gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
 380         if (!gpe_event_info) {
 381                 status = AE_BAD_PARAMETER;
 382                 goto unlock_and_exit;
 383         }
 384
 385         status = acpi_hw_clear_gpe(gpe_event_info);
 386
 387       unlock_and_exit:
 388         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 389         return_ACPI_STATUS(status);
 390 }
 391
 392 ACPI_EXPORT_SYMBOL(acpi_clear_gpe)
 393
 394 /*******************************************************************************
 395  *
 396  * FUNCTION:    acpi_get_gpe_status
 397  *
 398  * PARAMETERS:  gpe_device      - Parent GPE Device. NULL for GPE0/GPE1
 399  *              gpe_number      - GPE level within the GPE block
 400  *              event_status    - Where the current status of the event will
 401  *                                be returned
 402  *
 403  * RETURN:      Status
 404  *
 405  * DESCRIPTION: Get the current status of a GPE (signalled/not_signalled)
 406  *
 407  ******************************************************************************/
 408 acpi_status
 409 acpi_get_gpe_status(acpi_handle gpe_device,
 410                     u32 gpe_number, acpi_event_status *event_status)
 411 {
 412         acpi_status status = AE_OK;
 413         struct acpi_gpe_event_info *gpe_event_info;
 414         acpi_cpu_flags flags;
 415
 416         ACPI_FUNCTION_TRACE(acpi_get_gpe_status);
 417
 418         flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
 419
 420         /* Ensure that we have a valid GPE number */
 421
 422         gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
 423         if (!gpe_event_info) {
 424                 status = AE_BAD_PARAMETER;
 425                 goto unlock_and_exit;
 426         }
 427
 428         /* Obtain status on the requested GPE number */
 429
 430         status = acpi_hw_get_gpe_status(gpe_event_info, event_status);
 431
 432         if (gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK)
 433                 *event_status |= ACPI_EVENT_FLAG_HANDLE;
 434
 435       unlock_and_exit:
 436         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 437         return_ACPI_STATUS(status);
 438 }
 439
 440 ACPI_EXPORT_SYMBOL(acpi_get_gpe_status)
 441
 442 /******************************************************************************
 443  *
 444  * FUNCTION:    acpi_disable_all_gpes
 445  *
 446  * PARAMETERS:  None
 447  *
 448  * RETURN:      Status
 449  *
 450  * DESCRIPTION: Disable and clear all GPEs in all GPE blocks
 451  *
 452  ******************************************************************************/
 453
 454 acpi_status acpi_disable_all_gpes(void)
 455 {
 456         acpi_status status;
 457
 458         ACPI_FUNCTION_TRACE(acpi_disable_all_gpes);
 459
 460         status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
 461         if (ACPI_FAILURE(status)) {
 462                 return_ACPI_STATUS(status);
 463         }
 464
 465         status = acpi_hw_disable_all_gpes();
 466         (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
 467
 468         return_ACPI_STATUS(status);
 469 }
 470
 471 ACPI_EXPORT_SYMBOL(acpi_disable_all_gpes)
 472
 473 /******************************************************************************
 474  *
 475  * FUNCTION:    acpi_enable_all_runtime_gpes
 476  *
 477  * PARAMETERS:  None
 478  *
 479  * RETURN:      Status
 480  *
 481  * DESCRIPTION: Enable all "runtime" GPEs, in all GPE blocks
 482  *
 483  ******************************************************************************/
 484
 485 acpi_status acpi_enable_all_runtime_gpes(void)
 486 {
 487         acpi_status status;
 488
 489         ACPI_FUNCTION_TRACE(acpi_enable_all_runtime_gpes);
 490
 491         status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
 492         if (ACPI_FAILURE(status)) {
 493                 return_ACPI_STATUS(status);
 494         }
 495
 496         status = acpi_hw_enable_all_runtime_gpes();
 497         (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
 498
 499         return_ACPI_STATUS(status);
 500 }
 501
 502 ACPI_EXPORT_SYMBOL(acpi_enable_all_runtime_gpes)
 503
 504 /*******************************************************************************
 505  *
 506  * FUNCTION:    acpi_install_gpe_block
 507  *
 508  * PARAMETERS:  gpe_device          - Handle to the parent GPE Block Device
 509  *              gpe_block_address   - Address and space_iD
 510  *              register_count      - Number of GPE register pairs in the block
 511  *              interrupt_number    - H/W interrupt for the block
 512  *
 513  * RETURN:      Status
 514  *
 515  * DESCRIPTION: Create and Install a block of GPE registers. The GPEs are not
 516  *              enabled here.
 517  *
 518  ******************************************************************************/
 519 acpi_status
 520 acpi_install_gpe_block(acpi_handle gpe_device,
 521                        struct acpi_generic_address *gpe_block_address,
 522                        u32 register_count, u32 interrupt_number)
 523 {
 524         acpi_status status;
 525         union acpi_operand_object *obj_desc;
 526         struct acpi_namespace_node *node;
 527         struct acpi_gpe_block_info *gpe_block;
 528
 529         ACPI_FUNCTION_TRACE(acpi_install_gpe_block);
 530
 531         if ((!gpe_device) || (!gpe_block_address) || (!register_count)) {
 532                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 533         }
 534
 535         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
 536         if (ACPI_FAILURE(status)) {
 537                 return (status);
 538         }
 539
 540         node = acpi_ns_validate_handle(gpe_device);
 541         if (!node) {
 542                 status = AE_BAD_PARAMETER;
 543                 goto unlock_and_exit;
 544         }
 545
 546         /*
 547          * For user-installed GPE Block Devices, the gpe_block_base_number
 548          * is always zero
 549          */
 550         status =
 551             acpi_ev_create_gpe_block(node, gpe_block_address, register_count, 0,
 552                                      interrupt_number, &gpe_block);
 553         if (ACPI_FAILURE(status)) {
 554                 goto unlock_and_exit;
 555         }
 556
 557         /* Install block in the device_object attached to the node */
 558
 559         obj_desc = acpi_ns_get_attached_object(node);
 560         if (!obj_desc) {
 561
 562                 /*
 563                  * No object, create a new one (Device nodes do not always have
 564                  * an attached object)
 565                  */
 566                 obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_DEVICE);
 567                 if (!obj_desc) {
 568                         status = AE_NO_MEMORY;
 569                         goto unlock_and_exit;
 570                 }
 571
 572                 status =
 573                     acpi_ns_attach_object(node, obj_desc, ACPI_TYPE_DEVICE);
 574
 575                 /* Remove local reference to the object */
 576
 577                 acpi_ut_remove_reference(obj_desc);
 578
 579                 if (ACPI_FAILURE(status)) {
 580                         goto unlock_and_exit;
 581                 }
 582         }
 583
 584         /* Now install the GPE block in the device_object */
 585
 586         obj_desc->device.gpe_block = gpe_block;
 587
 588       unlock_and_exit:
 589         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 590         return_ACPI_STATUS(status);
 591 }
 592
 593 ACPI_EXPORT_SYMBOL(acpi_install_gpe_block)
 594
 595 /*******************************************************************************
 596  *
 597  * FUNCTION:    acpi_remove_gpe_block
 598  *
 599  * PARAMETERS:  gpe_device          - Handle to the parent GPE Block Device
 600  *
 601  * RETURN:      Status
 602  *
 603  * DESCRIPTION: Remove a previously installed block of GPE registers
 604  *
 605  ******************************************************************************/
 606 acpi_status acpi_remove_gpe_block(acpi_handle gpe_device)
 607 {
 608         union acpi_operand_object *obj_desc;
 609         acpi_status status;
 610         struct acpi_namespace_node *node;
 611
 612         ACPI_FUNCTION_TRACE(acpi_remove_gpe_block);
 613
 614         if (!gpe_device) {
 615                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 616         }
 617
 618         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
 619         if (ACPI_FAILURE(status)) {
 620                 return (status);
 621         }
 622
 623         node = acpi_ns_validate_handle(gpe_device);
 624         if (!node) {
 625                 status = AE_BAD_PARAMETER;
 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 || !obj_desc->device.gpe_block) {
 633                 return_ACPI_STATUS(AE_NULL_OBJECT);
 634         }
 635
 636         /* Delete the GPE block (but not the device_object) */
 637
 638         status = acpi_ev_delete_gpe_block(obj_desc->device.gpe_block);
 639         if (ACPI_SUCCESS(status)) {
 640                 obj_desc->device.gpe_block = NULL;
 641         }
 642
 643       unlock_and_exit:
 644         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 645         return_ACPI_STATUS(status);
 646 }
 647
 648 ACPI_EXPORT_SYMBOL(acpi_remove_gpe_block)
 649
 650 /*******************************************************************************
 651  *
 652  * FUNCTION:    acpi_get_gpe_device
 653  *
 654  * PARAMETERS:  Index               - System GPE index (0-current_gpe_count)
 655  *              gpe_device          - Where the parent GPE Device is returned
 656  *
 657  * RETURN:      Status
 658  *
 659  * DESCRIPTION: Obtain the GPE device associated with the input index. A NULL
 660  *              gpe device indicates that the gpe number is contained in one of
 661  *              the FADT-defined gpe blocks. Otherwise, the GPE block device.
 662  *
 663  ******************************************************************************/
 664 acpi_status
 665 acpi_get_gpe_device(u32 index, acpi_handle *gpe_device)
 666 {
 667         struct acpi_gpe_device_info info;
 668         acpi_status status;
 669
 670         ACPI_FUNCTION_TRACE(acpi_get_gpe_device);
 671
 672         if (!gpe_device) {
 673                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 674         }
 675
 676         if (index >= acpi_current_gpe_count) {
 677                 return_ACPI_STATUS(AE_NOT_EXIST);
 678         }
 679
 680         /* Setup and walk the GPE list */
 681
 682         info.index = index;
 683         info.status = AE_NOT_EXIST;
 684         info.gpe_device = NULL;
 685         info.next_block_base_index = 0;
 686
 687         status = acpi_ev_walk_gpe_list(acpi_ev_get_gpe_device, &info);
 688         if (ACPI_FAILURE(status)) {
 689                 return_ACPI_STATUS(status);
 690         }
 691
 692         *gpe_device = ACPI_CAST_PTR(acpi_handle, info.gpe_device);
 693         return_ACPI_STATUS(info.status);
 694 }
 695
 696 ACPI_EXPORT_SYMBOL(acpi_get_gpe_device)