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 - 2014, 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 #define EXPORT_ACPI_INTERFACES
  45
  46 #include <acpi/acpi.h>
  47 #include "accommon.h"
  48 #include "acevents.h"
  49 #include "acnamesp.h"
  50
  51 #define _COMPONENT          ACPI_EVENTS
  52 ACPI_MODULE_NAME("evxfgpe")
  53
  54 #if (!ACPI_REDUCED_HARDWARE)    /* Entire module */
  55 /*******************************************************************************
  56  *
  57  * FUNCTION:    acpi_update_all_gpes
  58  *
  59  * PARAMETERS:  None
  60  *
  61  * RETURN:      Status
  62  *
  63  * DESCRIPTION: Complete GPE initialization and enable all GPEs that have
  64  *              associated _Lxx or _Exx methods and are not pointed to by any
  65  *              device _PRW methods (this indicates that these GPEs are
  66  *              generally intended for system or device wakeup. Such GPEs
  67  *              have to be enabled directly when the devices whose _PRW
  68  *              methods point to them are set up for wakeup signaling.)
  69  *
  70  * NOTE: Should be called after any GPEs are added to the system. Primarily,
  71  * after the system _PRW methods have been run, but also after a GPE Block
  72  * Device has been added or if any new GPE methods have been added via a
  73  * dynamic table load.
  74  *
  75  ******************************************************************************/
  76
  77 acpi_status acpi_update_all_gpes(void)
  78 {
  79         acpi_status status;
  80
  81         ACPI_FUNCTION_TRACE(acpi_update_all_gpes);
  82
  83         status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
  84         if (ACPI_FAILURE(status)) {
  85                 return_ACPI_STATUS(status);
  86         }
  87
  88         if (acpi_gbl_all_gpes_initialized) {
  89                 goto unlock_and_exit;
  90         }
  91
  92         status = acpi_ev_walk_gpe_list(acpi_ev_initialize_gpe_block, NULL);
  93         if (ACPI_SUCCESS(status)) {
  94                 acpi_gbl_all_gpes_initialized = TRUE;
  95         }
  96
  97 unlock_and_exit:
  98         (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
  99
 100         return_ACPI_STATUS(status);
 101 }
 102
 103 ACPI_EXPORT_SYMBOL(acpi_update_all_gpes)
 104
 105 /*******************************************************************************
 106  *
 107  * FUNCTION:    acpi_enable_gpe
 108  *
 109  * PARAMETERS:  gpe_device          - Parent GPE Device. NULL for GPE0/GPE1
 110  *              gpe_number          - GPE level within the GPE block
 111  *
 112  * RETURN:      Status
 113  *
 114  * DESCRIPTION: Add a reference to a GPE. On the first reference, the GPE is
 115  *              hardware-enabled.
 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         /*
 129          * Ensure that we have a valid GPE number and that there is some way
 130          * of handling the GPE (handler or a GPE method). In other words, we
 131          * won't allow a valid GPE to be enabled if there is no way to handle it.
 132          */
 133         gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
 134         if (gpe_event_info) {
 135                 if ((gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) !=
 136                     ACPI_GPE_DISPATCH_NONE) {
 137                         status = acpi_ev_add_gpe_reference(gpe_event_info);
 138                 } else {
 139                         status = AE_NO_HANDLER;
 140                 }
 141         }
 142
 143         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 144         return_ACPI_STATUS(status);
 145 }
 146 ACPI_EXPORT_SYMBOL(acpi_enable_gpe)
 147
 148 /*******************************************************************************
 149  *
 150  * FUNCTION:    acpi_disable_gpe
 151  *
 152  * PARAMETERS:  gpe_device      - Parent GPE Device. NULL for GPE0/GPE1
 153  *              gpe_number      - GPE level within the GPE block
 154  *
 155  * RETURN:      Status
 156  *
 157  * DESCRIPTION: Remove a reference to a GPE. When the last reference is
 158  *              removed, only then is the GPE disabled (for runtime GPEs), or
 159  *              the GPE mask bit disabled (for wake GPEs)
 160  *
 161  ******************************************************************************/
 162
 163 acpi_status acpi_disable_gpe(acpi_handle gpe_device, u32 gpe_number)
 164 {
 165         acpi_status status = AE_BAD_PARAMETER;
 166         struct acpi_gpe_event_info *gpe_event_info;
 167         acpi_cpu_flags flags;
 168
 169         ACPI_FUNCTION_TRACE(acpi_disable_gpe);
 170
 171         flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
 172
 173         /* Ensure that we have a valid GPE number */
 174
 175         gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
 176         if (gpe_event_info) {
 177                 status = acpi_ev_remove_gpe_reference(gpe_event_info) ;
 178         }
 179
 180         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 181         return_ACPI_STATUS(status);
 182 }
 183
 184 ACPI_EXPORT_SYMBOL(acpi_disable_gpe)
 185
 186
 187 /*******************************************************************************
 188  *
 189  * FUNCTION:    acpi_mark_gpe_for_wake
 190  *
 191  * PARAMETERS:  gpe_device          - Parent GPE Device. NULL for GPE0/GPE1
 192  *              gpe_number          - GPE level within the GPE block
 193  *
 194  * RETURN:      Status
 195  *
 196  * DESCRIPTION: Mark a GPE as having the ability to wake the system. Simply
 197  *              sets the ACPI_GPE_CAN_WAKE flag.
 198  *
 199  * Some potential callers of acpi_setup_gpe_for_wake may know in advance that
 200  * there won't be any notify handlers installed for device wake notifications
 201  * from the given GPE (one example is a button GPE in Linux). For these cases,
 202  * acpi_mark_gpe_for_wake should be used instead of acpi_setup_gpe_for_wake.
 203  * This will set the ACPI_GPE_CAN_WAKE flag for the GPE without trying to
 204  * setup implicit wake notification for it (since there's no handler method).
 205  *
 206  ******************************************************************************/
 207 acpi_status acpi_mark_gpe_for_wake(acpi_handle gpe_device, u32 gpe_number)
 208 {
 209         struct acpi_gpe_event_info *gpe_event_info;
 210         acpi_status status = AE_BAD_PARAMETER;
 211         acpi_cpu_flags flags;
 212
 213         ACPI_FUNCTION_TRACE(acpi_mark_gpe_for_wake);
 214
 215         flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
 216
 217         /* Ensure that we have a valid GPE number */
 218
 219         gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
 220         if (gpe_event_info) {
 221
 222                 /* Mark the GPE as a possible wake event */
 223
 224                 gpe_event_info->flags |= ACPI_GPE_CAN_WAKE;
 225                 status = AE_OK;
 226         }
 227
 228         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 229         return_ACPI_STATUS(status);
 230 }
 231
 232 ACPI_EXPORT_SYMBOL(acpi_mark_gpe_for_wake)
 233
 234 /*******************************************************************************
 235  *
 236  * FUNCTION:    acpi_setup_gpe_for_wake
 237  *
 238  * PARAMETERS:  wake_device         - Device associated with the GPE (via _PRW)
 239  *              gpe_device          - Parent GPE Device. NULL for GPE0/GPE1
 240  *              gpe_number          - GPE level within the GPE block
 241  *
 242  * RETURN:      Status
 243  *
 244  * DESCRIPTION: Mark a GPE as having the ability to wake the system. This
 245  *              interface is intended to be used as the host executes the
 246  *              _PRW methods (Power Resources for Wake) in the system tables.
 247  *              Each _PRW appears under a Device Object (The wake_device), and
 248  *              contains the info for the wake GPE associated with the
 249  *              wake_device.
 250  *
 251  ******************************************************************************/
 252 acpi_status
 253 acpi_setup_gpe_for_wake(acpi_handle wake_device,
 254                         acpi_handle gpe_device, u32 gpe_number)
 255 {
 256         acpi_status status;
 257         struct acpi_gpe_event_info *gpe_event_info;
 258         struct acpi_namespace_node *device_node;
 259         struct acpi_gpe_notify_info *notify;
 260         struct acpi_gpe_notify_info *new_notify;
 261         acpi_cpu_flags flags;
 262
 263         ACPI_FUNCTION_TRACE(acpi_setup_gpe_for_wake);
 264
 265         /* Parameter Validation */
 266
 267         if (!wake_device) {
 268                 /*
 269                  * By forcing wake_device to be valid, we automatically enable the
 270                  * implicit notify feature on all hosts.
 271                  */
 272                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 273         }
 274
 275         /* Handle root object case */
 276
 277         if (wake_device == ACPI_ROOT_OBJECT) {
 278                 device_node = acpi_gbl_root_node;
 279         } else {
 280                 device_node =
 281                     ACPI_CAST_PTR(struct acpi_namespace_node, wake_device);
 282         }
 283
 284         /* Validate wake_device is of type Device */
 285
 286         if (device_node->type != ACPI_TYPE_DEVICE) {
 287                 return_ACPI_STATUS (AE_BAD_PARAMETER);
 288         }
 289
 290         /*
 291          * Allocate a new notify object up front, in case it is needed.
 292          * Memory allocation while holding a spinlock is a big no-no
 293          * on some hosts.
 294          */
 295         new_notify = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_gpe_notify_info));
 296         if (!new_notify) {
 297                 return_ACPI_STATUS(AE_NO_MEMORY);
 298         }
 299
 300         flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
 301
 302         /* Ensure that we have a valid GPE number */
 303
 304         gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
 305         if (!gpe_event_info) {
 306                 status = AE_BAD_PARAMETER;
 307                 goto unlock_and_exit;
 308         }
 309
 310         /*
 311          * If there is no method or handler for this GPE, then the
 312          * wake_device will be notified whenever this GPE fires. This is
 313          * known as an "implicit notify". Note: The GPE is assumed to be
 314          * level-triggered (for windows compatibility).
 315          */
 316         if ((gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) ==
 317             ACPI_GPE_DISPATCH_NONE) {
 318                 /*
 319                  * This is the first device for implicit notify on this GPE.
 320                  * Just set the flags here, and enter the NOTIFY block below.
 321                  */
 322                 gpe_event_info->flags =
 323                     (ACPI_GPE_DISPATCH_NOTIFY | ACPI_GPE_LEVEL_TRIGGERED);
 324         }
 325
 326         /*
 327          * If we already have an implicit notify on this GPE, add
 328          * this device to the notify list.
 329          */
 330         if ((gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) ==
 331             ACPI_GPE_DISPATCH_NOTIFY) {
 332
 333                 /* Ensure that the device is not already in the list */
 334
 335                 notify = gpe_event_info->dispatch.notify_list;
 336                 while (notify) {
 337                         if (notify->device_node == device_node) {
 338                                 status = AE_ALREADY_EXISTS;
 339                                 goto unlock_and_exit;
 340                         }
 341                         notify = notify->next;
 342                 }
 343
 344                 /* Add this device to the notify list for this GPE */
 345
 346                 new_notify->device_node = device_node;
 347                 new_notify->next = gpe_event_info->dispatch.notify_list;
 348                 gpe_event_info->dispatch.notify_list = new_notify;
 349                 new_notify = NULL;
 350         }
 351
 352         /* Mark the GPE as a possible wake event */
 353
 354         gpe_event_info->flags |= ACPI_GPE_CAN_WAKE;
 355         status = AE_OK;
 356
 357 unlock_and_exit:
 358         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 359
 360         /* Delete the notify object if it was not used above */
 361
 362         if (new_notify) {
 363                 ACPI_FREE(new_notify);
 364         }
 365         return_ACPI_STATUS(status);
 366 }
 367 ACPI_EXPORT_SYMBOL(acpi_setup_gpe_for_wake)
 368
 369 /*******************************************************************************
 370  *
 371  * FUNCTION:    acpi_set_gpe_wake_mask
 372  *
 373  * PARAMETERS:  gpe_device      - Parent GPE Device. NULL for GPE0/GPE1
 374  *              gpe_number      - GPE level within the GPE block
 375  *              action              - Enable or Disable
 376  *
 377  * RETURN:      Status
 378  *
 379  * DESCRIPTION: Set or clear the GPE's wakeup enable mask bit. The GPE must
 380  *              already be marked as a WAKE GPE.
 381  *
 382  ******************************************************************************/
 383
 384 acpi_status
 385 acpi_set_gpe_wake_mask(acpi_handle gpe_device, u32 gpe_number, u8 action)
 386 {
 387         acpi_status status = AE_OK;
 388         struct acpi_gpe_event_info *gpe_event_info;
 389         struct acpi_gpe_register_info *gpe_register_info;
 390         acpi_cpu_flags flags;
 391         u32 register_bit;
 392
 393         ACPI_FUNCTION_TRACE(acpi_set_gpe_wake_mask);
 394
 395         flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
 396
 397         /*
 398          * Ensure that we have a valid GPE number and that this GPE is in
 399          * fact a wake GPE
 400          */
 401         gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
 402         if (!gpe_event_info) {
 403                 status = AE_BAD_PARAMETER;
 404                 goto unlock_and_exit;
 405         }
 406
 407         if (!(gpe_event_info->flags & ACPI_GPE_CAN_WAKE)) {
 408                 status = AE_TYPE;
 409                 goto unlock_and_exit;
 410         }
 411
 412         gpe_register_info = gpe_event_info->register_info;
 413         if (!gpe_register_info) {
 414                 status = AE_NOT_EXIST;
 415                 goto unlock_and_exit;
 416         }
 417
 418         register_bit = acpi_hw_get_gpe_register_bit(gpe_event_info);
 419
 420         /* Perform the action */
 421
 422         switch (action) {
 423         case ACPI_GPE_ENABLE:
 424
 425                 ACPI_SET_BIT(gpe_register_info->enable_for_wake,
 426                              (u8)register_bit);
 427                 break;
 428
 429         case ACPI_GPE_DISABLE:
 430
 431                 ACPI_CLEAR_BIT(gpe_register_info->enable_for_wake,
 432                                (u8)register_bit);
 433                 break;
 434
 435         default:
 436
 437                 ACPI_ERROR((AE_INFO, "%u, Invalid action", action));
 438                 status = AE_BAD_PARAMETER;
 439                 break;
 440         }
 441
 442 unlock_and_exit:
 443         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 444         return_ACPI_STATUS(status);
 445 }
 446
 447 ACPI_EXPORT_SYMBOL(acpi_set_gpe_wake_mask)
 448
 449 /*******************************************************************************
 450  *
 451  * FUNCTION:    acpi_clear_gpe
 452  *
 453  * PARAMETERS:  gpe_device      - Parent GPE Device. NULL for GPE0/GPE1
 454  *              gpe_number      - GPE level within the GPE block
 455  *
 456  * RETURN:      Status
 457  *
 458  * DESCRIPTION: Clear an ACPI event (general purpose)
 459  *
 460  ******************************************************************************/
 461 acpi_status acpi_clear_gpe(acpi_handle gpe_device, u32 gpe_number)
 462 {
 463         acpi_status status = AE_OK;
 464         struct acpi_gpe_event_info *gpe_event_info;
 465         acpi_cpu_flags flags;
 466
 467         ACPI_FUNCTION_TRACE(acpi_clear_gpe);
 468
 469         flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
 470
 471         /* Ensure that we have a valid GPE number */
 472
 473         gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
 474         if (!gpe_event_info) {
 475                 status = AE_BAD_PARAMETER;
 476                 goto unlock_and_exit;
 477         }
 478
 479         status = acpi_hw_clear_gpe(gpe_event_info);
 480
 481       unlock_and_exit:
 482         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 483         return_ACPI_STATUS(status);
 484 }
 485
 486 ACPI_EXPORT_SYMBOL(acpi_clear_gpe)
 487
 488 /*******************************************************************************
 489  *
 490  * FUNCTION:    acpi_get_gpe_status
 491  *
 492  * PARAMETERS:  gpe_device          - Parent GPE Device. NULL for GPE0/GPE1
 493  *              gpe_number          - GPE level within the GPE block
 494  *              event_status        - Where the current status of the event
 495  *                                    will be returned
 496  *
 497  * RETURN:      Status
 498  *
 499  * DESCRIPTION: Get the current status of a GPE (signalled/not_signalled)
 500  *
 501  ******************************************************************************/
 502 acpi_status
 503 acpi_get_gpe_status(acpi_handle gpe_device,
 504                     u32 gpe_number, acpi_event_status *event_status)
 505 {
 506         acpi_status status = AE_OK;
 507         struct acpi_gpe_event_info *gpe_event_info;
 508         acpi_cpu_flags flags;
 509
 510         ACPI_FUNCTION_TRACE(acpi_get_gpe_status);
 511
 512         flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
 513
 514         /* Ensure that we have a valid GPE number */
 515
 516         gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
 517         if (!gpe_event_info) {
 518                 status = AE_BAD_PARAMETER;
 519                 goto unlock_and_exit;
 520         }
 521
 522         /* Obtain status on the requested GPE number */
 523
 524         status = acpi_hw_get_gpe_status(gpe_event_info, event_status);
 525
 526         if (gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK)
 527                 *event_status |= ACPI_EVENT_FLAG_HANDLE;
 528
 529 unlock_and_exit:
 530         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 531         return_ACPI_STATUS(status);
 532 }
 533
 534 ACPI_EXPORT_SYMBOL(acpi_get_gpe_status)
 535
 536 /******************************************************************************
 537  *
 538  * FUNCTION:    acpi_disable_all_gpes
 539  *
 540  * PARAMETERS:  None
 541  *
 542  * RETURN:      Status
 543  *
 544  * DESCRIPTION: Disable and clear all GPEs in all GPE blocks
 545  *
 546  ******************************************************************************/
 547
 548 acpi_status acpi_disable_all_gpes(void)
 549 {
 550         acpi_status status;
 551
 552         ACPI_FUNCTION_TRACE(acpi_disable_all_gpes);
 553
 554         status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
 555         if (ACPI_FAILURE(status)) {
 556                 return_ACPI_STATUS(status);
 557         }
 558
 559         status = acpi_hw_disable_all_gpes();
 560         (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
 561
 562         return_ACPI_STATUS(status);
 563 }
 564
 565 ACPI_EXPORT_SYMBOL(acpi_disable_all_gpes)
 566
 567 /******************************************************************************
 568  *
 569  * FUNCTION:    acpi_enable_all_runtime_gpes
 570  *
 571  * PARAMETERS:  None
 572  *
 573  * RETURN:      Status
 574  *
 575  * DESCRIPTION: Enable all "runtime" GPEs, in all GPE blocks
 576  *
 577  ******************************************************************************/
 578
 579 acpi_status acpi_enable_all_runtime_gpes(void)
 580 {
 581         acpi_status status;
 582
 583         ACPI_FUNCTION_TRACE(acpi_enable_all_runtime_gpes);
 584
 585         status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
 586         if (ACPI_FAILURE(status)) {
 587                 return_ACPI_STATUS(status);
 588         }
 589
 590         status = acpi_hw_enable_all_runtime_gpes();
 591         (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
 592
 593         return_ACPI_STATUS(status);
 594 }
 595
 596 ACPI_EXPORT_SYMBOL(acpi_enable_all_runtime_gpes)
 597
 598 /******************************************************************************
 599  *
 600  * FUNCTION:    acpi_enable_all_wakeup_gpes
 601  *
 602  * PARAMETERS:  None
 603  *
 604  * RETURN:      Status
 605  *
 606  * DESCRIPTION: Enable all "wakeup" GPEs and disable all of the other GPEs, in
 607  *              all GPE blocks.
 608  *
 609  ******************************************************************************/
 610
 611 acpi_status acpi_enable_all_wakeup_gpes(void)
 612 {
 613         acpi_status status;
 614
 615         ACPI_FUNCTION_TRACE(acpi_enable_all_wakeup_gpes);
 616
 617         status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
 618         if (ACPI_FAILURE(status)) {
 619                 return_ACPI_STATUS(status);
 620         }
 621
 622         status = acpi_hw_enable_all_wakeup_gpes();
 623         (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
 624
 625         return_ACPI_STATUS(status);
 626 }
 627
 628 ACPI_EXPORT_SYMBOL(acpi_enable_all_wakeup_gpes)
 629
 630 /*******************************************************************************
 631  *
 632  * FUNCTION:    acpi_install_gpe_block
 633  *
 634  * PARAMETERS:  gpe_device          - Handle to the parent GPE Block Device
 635  *              gpe_block_address   - Address and space_ID
 636  *              register_count      - Number of GPE register pairs in the block
 637  *              interrupt_number    - H/W interrupt for the block
 638  *
 639  * RETURN:      Status
 640  *
 641  * DESCRIPTION: Create and Install a block of GPE registers. The GPEs are not
 642  *              enabled here.
 643  *
 644  ******************************************************************************/
 645 acpi_status
 646 acpi_install_gpe_block(acpi_handle gpe_device,
 647                        struct acpi_generic_address *gpe_block_address,
 648                        u32 register_count, u32 interrupt_number)
 649 {
 650         acpi_status status;
 651         union acpi_operand_object *obj_desc;
 652         struct acpi_namespace_node *node;
 653         struct acpi_gpe_block_info *gpe_block;
 654
 655         ACPI_FUNCTION_TRACE(acpi_install_gpe_block);
 656
 657         if ((!gpe_device) || (!gpe_block_address) || (!register_count)) {
 658                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 659         }
 660
 661         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
 662         if (ACPI_FAILURE(status)) {
 663                 return_ACPI_STATUS(status);
 664         }
 665
 666         node = acpi_ns_validate_handle(gpe_device);
 667         if (!node) {
 668                 status = AE_BAD_PARAMETER;
 669                 goto unlock_and_exit;
 670         }
 671
 672         /* Validate the parent device */
 673
 674         if (node->type != ACPI_TYPE_DEVICE) {
 675                 status = AE_TYPE;
 676                 goto unlock_and_exit;
 677         }
 678
 679         if (node->object) {
 680                 status = AE_ALREADY_EXISTS;
 681                 goto unlock_and_exit;
 682         }
 683
 684         /*
 685          * For user-installed GPE Block Devices, the gpe_block_base_number
 686          * is always zero
 687          */
 688         status = acpi_ev_create_gpe_block(node, gpe_block_address->address,
 689                                           gpe_block_address->space_id,
 690                                           register_count, 0, interrupt_number,
 691                                           &gpe_block);
 692         if (ACPI_FAILURE(status)) {
 693                 goto unlock_and_exit;
 694         }
 695
 696         /* Install block in the device_object attached to the node */
 697
 698         obj_desc = acpi_ns_get_attached_object(node);
 699         if (!obj_desc) {
 700
 701                 /*
 702                  * No object, create a new one (Device nodes do not always have
 703                  * an attached object)
 704                  */
 705                 obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_DEVICE);
 706                 if (!obj_desc) {
 707                         status = AE_NO_MEMORY;
 708                         goto unlock_and_exit;
 709                 }
 710
 711                 status =
 712                     acpi_ns_attach_object(node, obj_desc, ACPI_TYPE_DEVICE);
 713
 714                 /* Remove local reference to the object */
 715
 716                 acpi_ut_remove_reference(obj_desc);
 717
 718                 if (ACPI_FAILURE(status)) {
 719                         goto unlock_and_exit;
 720                 }
 721         }
 722
 723         /* Now install the GPE block in the device_object */
 724
 725         obj_desc->device.gpe_block = gpe_block;
 726
 727 unlock_and_exit:
 728         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 729         return_ACPI_STATUS(status);
 730 }
 731
 732 ACPI_EXPORT_SYMBOL(acpi_install_gpe_block)
 733
 734 /*******************************************************************************
 735  *
 736  * FUNCTION:    acpi_remove_gpe_block
 737  *
 738  * PARAMETERS:  gpe_device          - Handle to the parent GPE Block Device
 739  *
 740  * RETURN:      Status
 741  *
 742  * DESCRIPTION: Remove a previously installed block of GPE registers
 743  *
 744  ******************************************************************************/
 745 acpi_status acpi_remove_gpe_block(acpi_handle gpe_device)
 746 {
 747         union acpi_operand_object *obj_desc;
 748         acpi_status status;
 749         struct acpi_namespace_node *node;
 750
 751         ACPI_FUNCTION_TRACE(acpi_remove_gpe_block);
 752
 753         if (!gpe_device) {
 754                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 755         }
 756
 757         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
 758         if (ACPI_FAILURE(status)) {
 759                 return_ACPI_STATUS(status);
 760         }
 761
 762         node = acpi_ns_validate_handle(gpe_device);
 763         if (!node) {
 764                 status = AE_BAD_PARAMETER;
 765                 goto unlock_and_exit;
 766         }
 767
 768         /* Validate the parent device */
 769
 770         if (node->type != ACPI_TYPE_DEVICE) {
 771                 status = AE_TYPE;
 772                 goto unlock_and_exit;
 773         }
 774
 775         /* Get the device_object attached to the node */
 776
 777         obj_desc = acpi_ns_get_attached_object(node);
 778         if (!obj_desc || !obj_desc->device.gpe_block) {
 779                 return_ACPI_STATUS(AE_NULL_OBJECT);
 780         }
 781
 782         /* Delete the GPE block (but not the device_object) */
 783
 784         status = acpi_ev_delete_gpe_block(obj_desc->device.gpe_block);
 785         if (ACPI_SUCCESS(status)) {
 786                 obj_desc->device.gpe_block = NULL;
 787         }
 788
 789 unlock_and_exit:
 790         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 791         return_ACPI_STATUS(status);
 792 }
 793
 794 ACPI_EXPORT_SYMBOL(acpi_remove_gpe_block)
 795
 796 /*******************************************************************************
 797  *
 798  * FUNCTION:    acpi_get_gpe_device
 799  *
 800  * PARAMETERS:  index               - System GPE index (0-current_gpe_count)
 801  *              gpe_device          - Where the parent GPE Device is returned
 802  *
 803  * RETURN:      Status
 804  *
 805  * DESCRIPTION: Obtain the GPE device associated with the input index. A NULL
 806  *              gpe device indicates that the gpe number is contained in one of
 807  *              the FADT-defined gpe blocks. Otherwise, the GPE block device.
 808  *
 809  ******************************************************************************/
 810 acpi_status acpi_get_gpe_device(u32 index, acpi_handle * gpe_device)
 811 {
 812         struct acpi_gpe_device_info info;
 813         acpi_status status;
 814
 815         ACPI_FUNCTION_TRACE(acpi_get_gpe_device);
 816
 817         if (!gpe_device) {
 818                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 819         }
 820
 821         if (index >= acpi_current_gpe_count) {
 822                 return_ACPI_STATUS(AE_NOT_EXIST);
 823         }
 824
 825         /* Setup and walk the GPE list */
 826
 827         info.index = index;
 828         info.status = AE_NOT_EXIST;
 829         info.gpe_device = NULL;
 830         info.next_block_base_index = 0;
 831
 832         status = acpi_ev_walk_gpe_list(acpi_ev_get_gpe_device, &info);
 833         if (ACPI_FAILURE(status)) {
 834                 return_ACPI_STATUS(status);
 835         }
 836
 837         *gpe_device = ACPI_CAST_PTR(acpi_handle, info.gpe_device);
 838         return_ACPI_STATUS(info.status);
 839 }
 840
 841 ACPI_EXPORT_SYMBOL(acpi_get_gpe_device)
 842 #endif                          /* !ACPI_REDUCED_HARDWARE */