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 - 2012, 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 <linux/export.h>
  45 #include <acpi/acpi.h>
  46 #include "accommon.h"
  47 #include "acevents.h"
  48 #include "acnamesp.h"
  49
  50 #define _COMPONENT          ACPI_EVENTS
  51 ACPI_MODULE_NAME("evxfgpe")
  52
  53 #if (!ACPI_REDUCED_HARDWARE)    /* Entire module */
  54 /******************************************************************************
  55  *
  56  * FUNCTION:    acpi_update_all_gpes
  57  *
  58  * PARAMETERS:  None
  59  *
  60  * RETURN:      Status
  61  *
  62  * DESCRIPTION: Complete GPE initialization and enable all GPEs that have
  63  *              associated _Lxx or _Exx methods and are not pointed to by any
  64  *              device _PRW methods (this indicates that these GPEs are
  65  *              generally intended for system or device wakeup. Such GPEs
  66  *              have to be enabled directly when the devices whose _PRW
  67  *              methods point to them are set up for wakeup signaling.)
  68  *
  69  * NOTE: Should be called after any GPEs are added to the system. Primarily,
  70  * after the system _PRW methods have been run, but also after a GPE Block
  71  * Device has been added or if any new GPE methods have been added via a
  72  * dynamic table load.
  73  *
  74  ******************************************************************************/
  75
  76 acpi_status acpi_update_all_gpes(void)
  77 {
  78         acpi_status status;
  79
  80         ACPI_FUNCTION_TRACE(acpi_update_all_gpes);
  81
  82         status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
  83         if (ACPI_FAILURE(status)) {
  84                 return_ACPI_STATUS(status);
  85         }
  86
  87         if (acpi_gbl_all_gpes_initialized) {
  88                 goto unlock_and_exit;
  89         }
  90
  91         status = acpi_ev_walk_gpe_list(acpi_ev_initialize_gpe_block, NULL);
  92         if (ACPI_SUCCESS(status)) {
  93                 acpi_gbl_all_gpes_initialized = TRUE;
  94         }
  95
  96 unlock_and_exit:
  97         (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
  98
  99         return_ACPI_STATUS(status);
 100 }
 101
 102 ACPI_EXPORT_SYMBOL(acpi_update_all_gpes)
 103
 104 /*******************************************************************************
 105  *
 106  * FUNCTION:    acpi_enable_gpe
 107  *
 108  * PARAMETERS:  gpe_device      - Parent GPE Device. NULL for GPE0/GPE1
 109  *              gpe_number      - GPE level within the GPE block
 110  *
 111  * RETURN:      Status
 112  *
 113  * DESCRIPTION: Add a reference to a GPE. On the first reference, the GPE is
 114  *              hardware-enabled.
 115  *
 116  ******************************************************************************/
 117
 118 acpi_status acpi_enable_gpe(acpi_handle gpe_device, u32 gpe_number)
 119 {
 120         acpi_status status = AE_BAD_PARAMETER;
 121         struct acpi_gpe_event_info *gpe_event_info;
 122         acpi_cpu_flags flags;
 123
 124         ACPI_FUNCTION_TRACE(acpi_enable_gpe);
 125
 126         flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
 127
 128         /* Ensure that we have a valid GPE number */
 129
 130         gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
 131         if (gpe_event_info) {
 132                 status = acpi_ev_add_gpe_reference(gpe_event_info);
 133         }
 134
 135         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 136         return_ACPI_STATUS(status);
 137 }
 138 ACPI_EXPORT_SYMBOL(acpi_enable_gpe)
 139
 140 /*******************************************************************************
 141  *
 142  * FUNCTION:    acpi_disable_gpe
 143  *
 144  * PARAMETERS:  gpe_device      - Parent GPE Device. NULL for GPE0/GPE1
 145  *              gpe_number      - GPE level within the GPE block
 146  *
 147  * RETURN:      Status
 148  *
 149  * DESCRIPTION: Remove a reference to a GPE. When the last reference is
 150  *              removed, only then is the GPE disabled (for runtime GPEs), or
 151  *              the GPE mask bit disabled (for wake GPEs)
 152  *
 153  ******************************************************************************/
 154
 155 acpi_status acpi_disable_gpe(acpi_handle gpe_device, u32 gpe_number)
 156 {
 157         acpi_status status = AE_BAD_PARAMETER;
 158         struct acpi_gpe_event_info *gpe_event_info;
 159         acpi_cpu_flags flags;
 160
 161         ACPI_FUNCTION_TRACE(acpi_disable_gpe);
 162
 163         flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
 164
 165         /* Ensure that we have a valid GPE number */
 166
 167         gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
 168         if (gpe_event_info) {
 169                 status = acpi_ev_remove_gpe_reference(gpe_event_info) ;
 170         }
 171
 172         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 173         return_ACPI_STATUS(status);
 174 }
 175 ACPI_EXPORT_SYMBOL(acpi_disable_gpe)
 176
 177
 178 /*******************************************************************************
 179  *
 180  * FUNCTION:    acpi_setup_gpe_for_wake
 181  *
 182  * PARAMETERS:  wake_device         - Device associated with the GPE (via _PRW)
 183  *              gpe_device          - Parent GPE Device. NULL for GPE0/GPE1
 184  *              gpe_number          - GPE level within the GPE block
 185  *
 186  * RETURN:      Status
 187  *
 188  * DESCRIPTION: Mark a GPE as having the ability to wake the system. This
 189  *              interface is intended to be used as the host executes the
 190  *              _PRW methods (Power Resources for Wake) in the system tables.
 191  *              Each _PRW appears under a Device Object (The wake_device), and
 192  *              contains the info for the wake GPE associated with the
 193  *              wake_device.
 194  *
 195  ******************************************************************************/
 196 acpi_status
 197 acpi_setup_gpe_for_wake(acpi_handle wake_device,
 198                         acpi_handle gpe_device, u32 gpe_number)
 199 {
 200         acpi_status status;
 201         struct acpi_gpe_event_info *gpe_event_info;
 202         struct acpi_namespace_node *device_node;
 203         struct acpi_gpe_notify_info *notify;
 204         struct acpi_gpe_notify_info *new_notify;
 205         acpi_cpu_flags flags;
 206
 207         ACPI_FUNCTION_TRACE(acpi_setup_gpe_for_wake);
 208
 209         /* Parameter Validation */
 210
 211         if (!wake_device) {
 212                 /*
 213                  * By forcing wake_device to be valid, we automatically enable the
 214                  * implicit notify feature on all hosts.
 215                  */
 216                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 217         }
 218
 219         /* Handle root object case */
 220
 221         if (wake_device == ACPI_ROOT_OBJECT) {
 222                 device_node = acpi_gbl_root_node;
 223         } else {
 224                 device_node = ACPI_CAST_PTR(struct acpi_namespace_node, wake_device);
 225         }
 226
 227         /* Validate WakeDevice is of type Device */
 228
 229         if (device_node->type != ACPI_TYPE_DEVICE) {
 230                 return_ACPI_STATUS (AE_BAD_PARAMETER);
 231         }
 232
 233         /*
 234          * Allocate a new notify object up front, in case it is needed.
 235          * Memory allocation while holding a spinlock is a big no-no
 236          * on some hosts.
 237          */
 238         new_notify = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_gpe_notify_info));
 239         if (!new_notify) {
 240                 return_ACPI_STATUS(AE_NO_MEMORY);
 241         }
 242
 243         flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
 244
 245         /* Ensure that we have a valid GPE number */
 246
 247         gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
 248         if (!gpe_event_info) {
 249                 status = AE_BAD_PARAMETER;
 250                 goto unlock_and_exit;
 251         }
 252
 253         /*
 254          * If there is no method or handler for this GPE, then the
 255          * wake_device will be notified whenever this GPE fires. This is
 256          * known as an "implicit notify". Note: The GPE is assumed to be
 257          * level-triggered (for windows compatibility).
 258          */
 259         if ((gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) ==
 260             ACPI_GPE_DISPATCH_NONE) {
 261                 /*
 262                  * This is the first device for implicit notify on this GPE.
 263                  * Just set the flags here, and enter the NOTIFY block below.
 264                  */
 265                 gpe_event_info->flags =
 266                     (ACPI_GPE_DISPATCH_NOTIFY | ACPI_GPE_LEVEL_TRIGGERED);
 267         }
 268
 269         /*
 270          * If we already have an implicit notify on this GPE, add
 271          * this device to the notify list.
 272          */
 273         if ((gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) ==
 274             ACPI_GPE_DISPATCH_NOTIFY) {
 275
 276                 /* Ensure that the device is not already in the list */
 277
 278                 notify = gpe_event_info->dispatch.notify_list;
 279                 while (notify) {
 280                         if (notify->device_node == device_node) {
 281                                 status = AE_ALREADY_EXISTS;
 282                                 goto unlock_and_exit;
 283                         }
 284                         notify = notify->next;
 285                 }
 286
 287                 /* Add this device to the notify list for this GPE */
 288
 289                 new_notify->device_node = device_node;
 290                 new_notify->next = gpe_event_info->dispatch.notify_list;
 291                 gpe_event_info->dispatch.notify_list = new_notify;
 292                 new_notify = NULL;
 293         }
 294
 295         /* Mark the GPE as a possible wake event */
 296
 297         gpe_event_info->flags |= ACPI_GPE_CAN_WAKE;
 298         status = AE_OK;
 299
 300 unlock_and_exit:
 301         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 302
 303         /* Delete the notify object if it was not used above */
 304
 305         if (new_notify) {
 306                 ACPI_FREE(new_notify);
 307         }
 308         return_ACPI_STATUS(status);
 309 }
 310 ACPI_EXPORT_SYMBOL(acpi_setup_gpe_for_wake)
 311
 312 /*******************************************************************************
 313  *
 314  * FUNCTION:    acpi_set_gpe_wake_mask
 315  *
 316  * PARAMETERS:  gpe_device      - Parent GPE Device. NULL for GPE0/GPE1
 317  *              gpe_number      - GPE level within the GPE block
 318  *              action              - Enable or Disable
 319  *
 320  * RETURN:      Status
 321  *
 322  * DESCRIPTION: Set or clear the GPE's wakeup enable mask bit. The GPE must
 323  *              already be marked as a WAKE GPE.
 324  *
 325  ******************************************************************************/
 326
 327 acpi_status acpi_set_gpe_wake_mask(acpi_handle gpe_device, u32 gpe_number, u8 action)
 328 {
 329         acpi_status status = AE_OK;
 330         struct acpi_gpe_event_info *gpe_event_info;
 331         struct acpi_gpe_register_info *gpe_register_info;
 332         acpi_cpu_flags flags;
 333         u32 register_bit;
 334
 335         ACPI_FUNCTION_TRACE(acpi_set_gpe_wake_mask);
 336
 337         flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
 338
 339         /*
 340          * Ensure that we have a valid GPE number and that this GPE is in
 341          * fact a wake GPE
 342          */
 343         gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
 344         if (!gpe_event_info) {
 345                 status = AE_BAD_PARAMETER;
 346                 goto unlock_and_exit;
 347         }
 348
 349         if (!(gpe_event_info->flags & ACPI_GPE_CAN_WAKE)) {
 350                 status = AE_TYPE;
 351                 goto unlock_and_exit;
 352         }
 353
 354         gpe_register_info = gpe_event_info->register_info;
 355         if (!gpe_register_info) {
 356                 status = AE_NOT_EXIST;
 357                 goto unlock_and_exit;
 358         }
 359
 360         register_bit = acpi_hw_get_gpe_register_bit(gpe_event_info);
 361
 362         /* Perform the action */
 363
 364         switch (action) {
 365         case ACPI_GPE_ENABLE:
 366                 ACPI_SET_BIT(gpe_register_info->enable_for_wake,
 367                              (u8)register_bit);
 368                 break;
 369
 370         case ACPI_GPE_DISABLE:
 371                 ACPI_CLEAR_BIT(gpe_register_info->enable_for_wake,
 372                                (u8)register_bit);
 373                 break;
 374
 375         default:
 376                 ACPI_ERROR((AE_INFO, "%u, Invalid action", action));
 377                 status = AE_BAD_PARAMETER;
 378                 break;
 379         }
 380
 381 unlock_and_exit:
 382         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 383         return_ACPI_STATUS(status);
 384 }
 385
 386 ACPI_EXPORT_SYMBOL(acpi_set_gpe_wake_mask)
 387
 388 /*******************************************************************************
 389  *
 390  * FUNCTION:    acpi_clear_gpe
 391  *
 392  * PARAMETERS:  gpe_device      - Parent GPE Device. NULL for GPE0/GPE1
 393  *              gpe_number      - GPE level within the GPE block
 394  *
 395  * RETURN:      Status
 396  *
 397  * DESCRIPTION: Clear an ACPI event (general purpose)
 398  *
 399  ******************************************************************************/
 400 acpi_status acpi_clear_gpe(acpi_handle gpe_device, u32 gpe_number)
 401 {
 402         acpi_status status = AE_OK;
 403         struct acpi_gpe_event_info *gpe_event_info;
 404         acpi_cpu_flags flags;
 405
 406         ACPI_FUNCTION_TRACE(acpi_clear_gpe);
 407
 408         flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
 409
 410         /* Ensure that we have a valid GPE number */
 411
 412         gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
 413         if (!gpe_event_info) {
 414                 status = AE_BAD_PARAMETER;
 415                 goto unlock_and_exit;
 416         }
 417
 418         status = acpi_hw_clear_gpe(gpe_event_info);
 419
 420       unlock_and_exit:
 421         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 422         return_ACPI_STATUS(status);
 423 }
 424
 425 ACPI_EXPORT_SYMBOL(acpi_clear_gpe)
 426
 427 /*******************************************************************************
 428  *
 429  * FUNCTION:    acpi_get_gpe_status
 430  *
 431  * PARAMETERS:  gpe_device      - Parent GPE Device. NULL for GPE0/GPE1
 432  *              gpe_number      - GPE level within the GPE block
 433  *              event_status    - Where the current status of the event will
 434  *                                be returned
 435  *
 436  * RETURN:      Status
 437  *
 438  * DESCRIPTION: Get the current status of a GPE (signalled/not_signalled)
 439  *
 440  ******************************************************************************/
 441 acpi_status
 442 acpi_get_gpe_status(acpi_handle gpe_device,
 443                     u32 gpe_number, acpi_event_status *event_status)
 444 {
 445         acpi_status status = AE_OK;
 446         struct acpi_gpe_event_info *gpe_event_info;
 447         acpi_cpu_flags flags;
 448
 449         ACPI_FUNCTION_TRACE(acpi_get_gpe_status);
 450
 451         flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
 452
 453         /* Ensure that we have a valid GPE number */
 454
 455         gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
 456         if (!gpe_event_info) {
 457                 status = AE_BAD_PARAMETER;
 458                 goto unlock_and_exit;
 459         }
 460
 461         /* Obtain status on the requested GPE number */
 462
 463         status = acpi_hw_get_gpe_status(gpe_event_info, event_status);
 464
 465         if (gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK)
 466                 *event_status |= ACPI_EVENT_FLAG_HANDLE;
 467
 468       unlock_and_exit:
 469         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 470         return_ACPI_STATUS(status);
 471 }
 472
 473 ACPI_EXPORT_SYMBOL(acpi_get_gpe_status)
 474
 475 /******************************************************************************
 476  *
 477  * FUNCTION:    acpi_disable_all_gpes
 478  *
 479  * PARAMETERS:  None
 480  *
 481  * RETURN:      Status
 482  *
 483  * DESCRIPTION: Disable and clear all GPEs in all GPE blocks
 484  *
 485  ******************************************************************************/
 486
 487 acpi_status acpi_disable_all_gpes(void)
 488 {
 489         acpi_status status;
 490
 491         ACPI_FUNCTION_TRACE(acpi_disable_all_gpes);
 492
 493         status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
 494         if (ACPI_FAILURE(status)) {
 495                 return_ACPI_STATUS(status);
 496         }
 497
 498         status = acpi_hw_disable_all_gpes();
 499         (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
 500
 501         return_ACPI_STATUS(status);
 502 }
 503
 504 ACPI_EXPORT_SYMBOL(acpi_disable_all_gpes)
 505
 506 /******************************************************************************
 507  *
 508  * FUNCTION:    acpi_enable_all_runtime_gpes
 509  *
 510  * PARAMETERS:  None
 511  *
 512  * RETURN:      Status
 513  *
 514  * DESCRIPTION: Enable all "runtime" GPEs, in all GPE blocks
 515  *
 516  ******************************************************************************/
 517
 518 acpi_status acpi_enable_all_runtime_gpes(void)
 519 {
 520         acpi_status status;
 521
 522         ACPI_FUNCTION_TRACE(acpi_enable_all_runtime_gpes);
 523
 524         status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
 525         if (ACPI_FAILURE(status)) {
 526                 return_ACPI_STATUS(status);
 527         }
 528
 529         status = acpi_hw_enable_all_runtime_gpes();
 530         (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
 531
 532         return_ACPI_STATUS(status);
 533 }
 534
 535 ACPI_EXPORT_SYMBOL(acpi_enable_all_runtime_gpes)
 536
 537 /*******************************************************************************
 538  *
 539  * FUNCTION:    acpi_install_gpe_block
 540  *
 541  * PARAMETERS:  gpe_device          - Handle to the parent GPE Block Device
 542  *              gpe_block_address   - Address and space_ID
 543  *              register_count      - Number of GPE register pairs in the block
 544  *              interrupt_number    - H/W interrupt for the block
 545  *
 546  * RETURN:      Status
 547  *
 548  * DESCRIPTION: Create and Install a block of GPE registers. The GPEs are not
 549  *              enabled here.
 550  *
 551  ******************************************************************************/
 552 acpi_status
 553 acpi_install_gpe_block(acpi_handle gpe_device,
 554                        struct acpi_generic_address *gpe_block_address,
 555                        u32 register_count, u32 interrupt_number)
 556 {
 557         acpi_status status;
 558         union acpi_operand_object *obj_desc;
 559         struct acpi_namespace_node *node;
 560         struct acpi_gpe_block_info *gpe_block;
 561
 562         ACPI_FUNCTION_TRACE(acpi_install_gpe_block);
 563
 564         if ((!gpe_device) || (!gpe_block_address) || (!register_count)) {
 565                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 566         }
 567
 568         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
 569         if (ACPI_FAILURE(status)) {
 570                 return (status);
 571         }
 572
 573         node = acpi_ns_validate_handle(gpe_device);
 574         if (!node) {
 575                 status = AE_BAD_PARAMETER;
 576                 goto unlock_and_exit;
 577         }
 578
 579         /*
 580          * For user-installed GPE Block Devices, the gpe_block_base_number
 581          * is always zero
 582          */
 583         status =
 584             acpi_ev_create_gpe_block(node, gpe_block_address, register_count, 0,
 585                                      interrupt_number, &gpe_block);
 586         if (ACPI_FAILURE(status)) {
 587                 goto unlock_and_exit;
 588         }
 589
 590         /* Install block in the device_object attached to the node */
 591
 592         obj_desc = acpi_ns_get_attached_object(node);
 593         if (!obj_desc) {
 594
 595                 /*
 596                  * No object, create a new one (Device nodes do not always have
 597                  * an attached object)
 598                  */
 599                 obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_DEVICE);
 600                 if (!obj_desc) {
 601                         status = AE_NO_MEMORY;
 602                         goto unlock_and_exit;
 603                 }
 604
 605                 status =
 606                     acpi_ns_attach_object(node, obj_desc, ACPI_TYPE_DEVICE);
 607
 608                 /* Remove local reference to the object */
 609
 610                 acpi_ut_remove_reference(obj_desc);
 611
 612                 if (ACPI_FAILURE(status)) {
 613                         goto unlock_and_exit;
 614                 }
 615         }
 616
 617         /* Now install the GPE block in the device_object */
 618
 619         obj_desc->device.gpe_block = gpe_block;
 620
 621       unlock_and_exit:
 622         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 623         return_ACPI_STATUS(status);
 624 }
 625
 626 ACPI_EXPORT_SYMBOL(acpi_install_gpe_block)
 627
 628 /*******************************************************************************
 629  *
 630  * FUNCTION:    acpi_remove_gpe_block
 631  *
 632  * PARAMETERS:  gpe_device          - Handle to the parent GPE Block Device
 633  *
 634  * RETURN:      Status
 635  *
 636  * DESCRIPTION: Remove a previously installed block of GPE registers
 637  *
 638  ******************************************************************************/
 639 acpi_status acpi_remove_gpe_block(acpi_handle gpe_device)
 640 {
 641         union acpi_operand_object *obj_desc;
 642         acpi_status status;
 643         struct acpi_namespace_node *node;
 644
 645         ACPI_FUNCTION_TRACE(acpi_remove_gpe_block);
 646
 647         if (!gpe_device) {
 648                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 649         }
 650
 651         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
 652         if (ACPI_FAILURE(status)) {
 653                 return (status);
 654         }
 655
 656         node = acpi_ns_validate_handle(gpe_device);
 657         if (!node) {
 658                 status = AE_BAD_PARAMETER;
 659                 goto unlock_and_exit;
 660         }
 661
 662         /* Get the device_object attached to the node */
 663
 664         obj_desc = acpi_ns_get_attached_object(node);
 665         if (!obj_desc || !obj_desc->device.gpe_block) {
 666                 return_ACPI_STATUS(AE_NULL_OBJECT);
 667         }
 668
 669         /* Delete the GPE block (but not the device_object) */
 670
 671         status = acpi_ev_delete_gpe_block(obj_desc->device.gpe_block);
 672         if (ACPI_SUCCESS(status)) {
 673                 obj_desc->device.gpe_block = NULL;
 674         }
 675
 676       unlock_and_exit:
 677         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 678         return_ACPI_STATUS(status);
 679 }
 680
 681 ACPI_EXPORT_SYMBOL(acpi_remove_gpe_block)
 682
 683 /*******************************************************************************
 684  *
 685  * FUNCTION:    acpi_get_gpe_device
 686  *
 687  * PARAMETERS:  index               - System GPE index (0-current_gpe_count)
 688  *              gpe_device          - Where the parent GPE Device is returned
 689  *
 690  * RETURN:      Status
 691  *
 692  * DESCRIPTION: Obtain the GPE device associated with the input index. A NULL
 693  *              gpe device indicates that the gpe number is contained in one of
 694  *              the FADT-defined gpe blocks. Otherwise, the GPE block device.
 695  *
 696  ******************************************************************************/
 697 acpi_status
 698 acpi_get_gpe_device(u32 index, acpi_handle *gpe_device)
 699 {
 700         struct acpi_gpe_device_info info;
 701         acpi_status status;
 702
 703         ACPI_FUNCTION_TRACE(acpi_get_gpe_device);
 704
 705         if (!gpe_device) {
 706                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 707         }
 708
 709         if (index >= acpi_current_gpe_count) {
 710                 return_ACPI_STATUS(AE_NOT_EXIST);
 711         }
 712
 713         /* Setup and walk the GPE list */
 714
 715         info.index = index;
 716         info.status = AE_NOT_EXIST;
 717         info.gpe_device = NULL;
 718         info.next_block_base_index = 0;
 719
 720         status = acpi_ev_walk_gpe_list(acpi_ev_get_gpe_device, &info);
 721         if (ACPI_FAILURE(status)) {
 722                 return_ACPI_STATUS(status);
 723         }
 724
 725         *gpe_device = ACPI_CAST_PTR(acpi_handle, info.gpe_device);
 726         return_ACPI_STATUS(info.status);
 727 }
 728
 729 ACPI_EXPORT_SYMBOL(acpi_get_gpe_device)
 730 #endif                          /* !ACPI_REDUCED_HARDWARE */