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 =
 361             acpi_hw_get_gpe_register_bit(gpe_event_info, gpe_register_info);
 362
 363         /* Perform the action */
 364
 365         switch (action) {
 366         case ACPI_GPE_ENABLE:
 367                 ACPI_SET_BIT(gpe_register_info->enable_for_wake,
 368                              (u8)register_bit);
 369                 break;
 370
 371         case ACPI_GPE_DISABLE:
 372                 ACPI_CLEAR_BIT(gpe_register_info->enable_for_wake,
 373                                (u8)register_bit);
 374                 break;
 375
 376         default:
 377                 ACPI_ERROR((AE_INFO, "%u, Invalid action", action));
 378                 status = AE_BAD_PARAMETER;
 379                 break;
 380         }
 381
 382 unlock_and_exit:
 383         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 384         return_ACPI_STATUS(status);
 385 }
 386
 387 ACPI_EXPORT_SYMBOL(acpi_set_gpe_wake_mask)
 388
 389 /*******************************************************************************
 390  *
 391  * FUNCTION:    acpi_clear_gpe
 392  *
 393  * PARAMETERS:  gpe_device      - Parent GPE Device. NULL for GPE0/GPE1
 394  *              gpe_number      - GPE level within the GPE block
 395  *
 396  * RETURN:      Status
 397  *
 398  * DESCRIPTION: Clear an ACPI event (general purpose)
 399  *
 400  ******************************************************************************/
 401 acpi_status acpi_clear_gpe(acpi_handle gpe_device, u32 gpe_number)
 402 {
 403         acpi_status status = AE_OK;
 404         struct acpi_gpe_event_info *gpe_event_info;
 405         acpi_cpu_flags flags;
 406
 407         ACPI_FUNCTION_TRACE(acpi_clear_gpe);
 408
 409         flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
 410
 411         /* Ensure that we have a valid GPE number */
 412
 413         gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
 414         if (!gpe_event_info) {
 415                 status = AE_BAD_PARAMETER;
 416                 goto unlock_and_exit;
 417         }
 418
 419         status = acpi_hw_clear_gpe(gpe_event_info);
 420
 421       unlock_and_exit:
 422         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 423         return_ACPI_STATUS(status);
 424 }
 425
 426 ACPI_EXPORT_SYMBOL(acpi_clear_gpe)
 427
 428 /*******************************************************************************
 429  *
 430  * FUNCTION:    acpi_get_gpe_status
 431  *
 432  * PARAMETERS:  gpe_device      - Parent GPE Device. NULL for GPE0/GPE1
 433  *              gpe_number      - GPE level within the GPE block
 434  *              event_status    - Where the current status of the event will
 435  *                                be returned
 436  *
 437  * RETURN:      Status
 438  *
 439  * DESCRIPTION: Get the current status of a GPE (signalled/not_signalled)
 440  *
 441  ******************************************************************************/
 442 acpi_status
 443 acpi_get_gpe_status(acpi_handle gpe_device,
 444                     u32 gpe_number, acpi_event_status *event_status)
 445 {
 446         acpi_status status = AE_OK;
 447         struct acpi_gpe_event_info *gpe_event_info;
 448         acpi_cpu_flags flags;
 449
 450         ACPI_FUNCTION_TRACE(acpi_get_gpe_status);
 451
 452         flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
 453
 454         /* Ensure that we have a valid GPE number */
 455
 456         gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
 457         if (!gpe_event_info) {
 458                 status = AE_BAD_PARAMETER;
 459                 goto unlock_and_exit;
 460         }
 461
 462         /* Obtain status on the requested GPE number */
 463
 464         status = acpi_hw_get_gpe_status(gpe_event_info, event_status);
 465
 466         if (gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK)
 467                 *event_status |= ACPI_EVENT_FLAG_HANDLE;
 468
 469       unlock_and_exit:
 470         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 471         return_ACPI_STATUS(status);
 472 }
 473
 474 ACPI_EXPORT_SYMBOL(acpi_get_gpe_status)
 475
 476 /******************************************************************************
 477  *
 478  * FUNCTION:    acpi_disable_all_gpes
 479  *
 480  * PARAMETERS:  None
 481  *
 482  * RETURN:      Status
 483  *
 484  * DESCRIPTION: Disable and clear all GPEs in all GPE blocks
 485  *
 486  ******************************************************************************/
 487
 488 acpi_status acpi_disable_all_gpes(void)
 489 {
 490         acpi_status status;
 491
 492         ACPI_FUNCTION_TRACE(acpi_disable_all_gpes);
 493
 494         status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
 495         if (ACPI_FAILURE(status)) {
 496                 return_ACPI_STATUS(status);
 497         }
 498
 499         status = acpi_hw_disable_all_gpes();
 500         (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
 501
 502         return_ACPI_STATUS(status);
 503 }
 504
 505 ACPI_EXPORT_SYMBOL(acpi_disable_all_gpes)
 506
 507 /******************************************************************************
 508  *
 509  * FUNCTION:    acpi_enable_all_runtime_gpes
 510  *
 511  * PARAMETERS:  None
 512  *
 513  * RETURN:      Status
 514  *
 515  * DESCRIPTION: Enable all "runtime" GPEs, in all GPE blocks
 516  *
 517  ******************************************************************************/
 518
 519 acpi_status acpi_enable_all_runtime_gpes(void)
 520 {
 521         acpi_status status;
 522
 523         ACPI_FUNCTION_TRACE(acpi_enable_all_runtime_gpes);
 524
 525         status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
 526         if (ACPI_FAILURE(status)) {
 527                 return_ACPI_STATUS(status);
 528         }
 529
 530         status = acpi_hw_enable_all_runtime_gpes();
 531         (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
 532
 533         return_ACPI_STATUS(status);
 534 }
 535
 536 ACPI_EXPORT_SYMBOL(acpi_enable_all_runtime_gpes)
 537
 538 /*******************************************************************************
 539  *
 540  * FUNCTION:    acpi_install_gpe_block
 541  *
 542  * PARAMETERS:  gpe_device          - Handle to the parent GPE Block Device
 543  *              gpe_block_address   - Address and space_ID
 544  *              register_count      - Number of GPE register pairs in the block
 545  *              interrupt_number    - H/W interrupt for the block
 546  *
 547  * RETURN:      Status
 548  *
 549  * DESCRIPTION: Create and Install a block of GPE registers. The GPEs are not
 550  *              enabled here.
 551  *
 552  ******************************************************************************/
 553 acpi_status
 554 acpi_install_gpe_block(acpi_handle gpe_device,
 555                        struct acpi_generic_address *gpe_block_address,
 556                        u32 register_count, u32 interrupt_number)
 557 {
 558         acpi_status status;
 559         union acpi_operand_object *obj_desc;
 560         struct acpi_namespace_node *node;
 561         struct acpi_gpe_block_info *gpe_block;
 562
 563         ACPI_FUNCTION_TRACE(acpi_install_gpe_block);
 564
 565         if ((!gpe_device) || (!gpe_block_address) || (!register_count)) {
 566                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 567         }
 568
 569         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
 570         if (ACPI_FAILURE(status)) {
 571                 return (status);
 572         }
 573
 574         node = acpi_ns_validate_handle(gpe_device);
 575         if (!node) {
 576                 status = AE_BAD_PARAMETER;
 577                 goto unlock_and_exit;
 578         }
 579
 580         /*
 581          * For user-installed GPE Block Devices, the gpe_block_base_number
 582          * is always zero
 583          */
 584         status =
 585             acpi_ev_create_gpe_block(node, gpe_block_address, register_count, 0,
 586                                      interrupt_number, &gpe_block);
 587         if (ACPI_FAILURE(status)) {
 588                 goto unlock_and_exit;
 589         }
 590
 591         /* Install block in the device_object attached to the node */
 592
 593         obj_desc = acpi_ns_get_attached_object(node);
 594         if (!obj_desc) {
 595
 596                 /*
 597                  * No object, create a new one (Device nodes do not always have
 598                  * an attached object)
 599                  */
 600                 obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_DEVICE);
 601                 if (!obj_desc) {
 602                         status = AE_NO_MEMORY;
 603                         goto unlock_and_exit;
 604                 }
 605
 606                 status =
 607                     acpi_ns_attach_object(node, obj_desc, ACPI_TYPE_DEVICE);
 608
 609                 /* Remove local reference to the object */
 610
 611                 acpi_ut_remove_reference(obj_desc);
 612
 613                 if (ACPI_FAILURE(status)) {
 614                         goto unlock_and_exit;
 615                 }
 616         }
 617
 618         /* Now install the GPE block in the device_object */
 619
 620         obj_desc->device.gpe_block = gpe_block;
 621
 622       unlock_and_exit:
 623         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 624         return_ACPI_STATUS(status);
 625 }
 626
 627 ACPI_EXPORT_SYMBOL(acpi_install_gpe_block)
 628
 629 /*******************************************************************************
 630  *
 631  * FUNCTION:    acpi_remove_gpe_block
 632  *
 633  * PARAMETERS:  gpe_device          - Handle to the parent GPE Block Device
 634  *
 635  * RETURN:      Status
 636  *
 637  * DESCRIPTION: Remove a previously installed block of GPE registers
 638  *
 639  ******************************************************************************/
 640 acpi_status acpi_remove_gpe_block(acpi_handle gpe_device)
 641 {
 642         union acpi_operand_object *obj_desc;
 643         acpi_status status;
 644         struct acpi_namespace_node *node;
 645
 646         ACPI_FUNCTION_TRACE(acpi_remove_gpe_block);
 647
 648         if (!gpe_device) {
 649                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 650         }
 651
 652         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
 653         if (ACPI_FAILURE(status)) {
 654                 return (status);
 655         }
 656
 657         node = acpi_ns_validate_handle(gpe_device);
 658         if (!node) {
 659                 status = AE_BAD_PARAMETER;
 660                 goto unlock_and_exit;
 661         }
 662
 663         /* Get the device_object attached to the node */
 664
 665         obj_desc = acpi_ns_get_attached_object(node);
 666         if (!obj_desc || !obj_desc->device.gpe_block) {
 667                 return_ACPI_STATUS(AE_NULL_OBJECT);
 668         }
 669
 670         /* Delete the GPE block (but not the device_object) */
 671
 672         status = acpi_ev_delete_gpe_block(obj_desc->device.gpe_block);
 673         if (ACPI_SUCCESS(status)) {
 674                 obj_desc->device.gpe_block = NULL;
 675         }
 676
 677       unlock_and_exit:
 678         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 679         return_ACPI_STATUS(status);
 680 }
 681
 682 ACPI_EXPORT_SYMBOL(acpi_remove_gpe_block)
 683
 684 /*******************************************************************************
 685  *
 686  * FUNCTION:    acpi_get_gpe_device
 687  *
 688  * PARAMETERS:  index               - System GPE index (0-current_gpe_count)
 689  *              gpe_device          - Where the parent GPE Device is returned
 690  *
 691  * RETURN:      Status
 692  *
 693  * DESCRIPTION: Obtain the GPE device associated with the input index. A NULL
 694  *              gpe device indicates that the gpe number is contained in one of
 695  *              the FADT-defined gpe blocks. Otherwise, the GPE block device.
 696  *
 697  ******************************************************************************/
 698 acpi_status
 699 acpi_get_gpe_device(u32 index, acpi_handle *gpe_device)
 700 {
 701         struct acpi_gpe_device_info info;
 702         acpi_status status;
 703
 704         ACPI_FUNCTION_TRACE(acpi_get_gpe_device);
 705
 706         if (!gpe_device) {
 707                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 708         }
 709
 710         if (index >= acpi_current_gpe_count) {
 711                 return_ACPI_STATUS(AE_NOT_EXIST);
 712         }
 713
 714         /* Setup and walk the GPE list */
 715
 716         info.index = index;
 717         info.status = AE_NOT_EXIST;
 718         info.gpe_device = NULL;
 719         info.next_block_base_index = 0;
 720
 721         status = acpi_ev_walk_gpe_list(acpi_ev_get_gpe_device, &info);
 722         if (ACPI_FAILURE(status)) {
 723                 return_ACPI_STATUS(status);
 724         }
 725
 726         *gpe_device = ACPI_CAST_PTR(acpi_handle, info.gpe_device);
 727         return_ACPI_STATUS(info.status);
 728 }
 729
 730 ACPI_EXPORT_SYMBOL(acpi_get_gpe_device)
 731 #endif                          /* !ACPI_REDUCED_HARDWARE */