drivers/acpi/acpica/evxfevnt.c

   1 /******************************************************************************
   2  *
   3  * Module Name: evxfevnt - External Interfaces, ACPI event disable/enable
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2008, Intel Corp.
   9  * All rights reserved.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions, and the following disclaimer,
  16  *    without modification.
  17  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  18  *    substantially similar to the "NO WARRANTY" disclaimer below
  19  *    ("Disclaimer") and any redistribution must be conditioned upon
  20  *    including a substantially similar Disclaimer requirement for further
  21  *    binary redistribution.
  22  * 3. Neither the names of the above-listed copyright holders nor the names
  23  *    of any contributors may be used to endorse or promote products derived
  24  *    from this software without specific prior written permission.
  25  *
  26  * Alternatively, this software may be distributed under the terms of the
  27  * GNU General Public License ("GPL") version 2 as published by the Free
  28  * Software Foundation.
  29  *
  30  * NO WARRANTY
  31  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  32  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  33  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  34  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  35  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  36  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  37  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  38  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  39  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  40  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  41  * POSSIBILITY OF SUCH DAMAGES.
  42  */
  43
  44 #include <acpi/acpi.h>
  45 #include "accommon.h"
  46 #include "acevents.h"
  47 #include "acnamesp.h"
  48 #include "actables.h"
  49
  50 #define _COMPONENT          ACPI_EVENTS
  51 ACPI_MODULE_NAME("evxfevnt")
  52
  53 /* Local prototypes */
  54 static acpi_status
  55 acpi_ev_get_gpe_device(struct acpi_gpe_xrupt_info *gpe_xrupt_info,
  56                        struct acpi_gpe_block_info *gpe_block, void *context);
  57
  58 /*******************************************************************************
  59  *
  60  * FUNCTION:    acpi_enable
  61  *
  62  * PARAMETERS:  None
  63  *
  64  * RETURN:      Status
  65  *
  66  * DESCRIPTION: Transfers the system into ACPI mode.
  67  *
  68  ******************************************************************************/
  69
  70 acpi_status acpi_enable(void)
  71 {
  72         acpi_status status = AE_OK;
  73
  74         ACPI_FUNCTION_TRACE(acpi_enable);
  75
  76         /* ACPI tables must be present */
  77
  78         if (!acpi_tb_tables_loaded()) {
  79                 return_ACPI_STATUS(AE_NO_ACPI_TABLES);
  80         }
  81
  82         /* Check current mode */
  83
  84         if (acpi_hw_get_mode() == ACPI_SYS_MODE_ACPI) {
  85                 ACPI_DEBUG_PRINT((ACPI_DB_INIT,
  86                                   "System is already in ACPI mode\n"));
  87         } else {
  88                 /* Transition to ACPI mode */
  89
  90                 status = acpi_hw_set_mode(ACPI_SYS_MODE_ACPI);
  91                 if (ACPI_FAILURE(status)) {
  92                         ACPI_ERROR((AE_INFO,
  93                                     "Could not transition to ACPI mode"));
  94                         return_ACPI_STATUS(status);
  95                 }
  96
  97                 ACPI_DEBUG_PRINT((ACPI_DB_INIT,
  98                                   "Transition to ACPI mode successful\n"));
  99         }
 100
 101         return_ACPI_STATUS(status);
 102 }
 103
 104 ACPI_EXPORT_SYMBOL(acpi_enable)
 105
 106 /*******************************************************************************
 107  *
 108  * FUNCTION:    acpi_disable
 109  *
 110  * PARAMETERS:  None
 111  *
 112  * RETURN:      Status
 113  *
 114  * DESCRIPTION: Transfers the system into LEGACY (non-ACPI) mode.
 115  *
 116  ******************************************************************************/
 117 acpi_status acpi_disable(void)
 118 {
 119         acpi_status status = AE_OK;
 120
 121         ACPI_FUNCTION_TRACE(acpi_disable);
 122
 123         if (acpi_hw_get_mode() == ACPI_SYS_MODE_LEGACY) {
 124                 ACPI_DEBUG_PRINT((ACPI_DB_INIT,
 125                                   "System is already in legacy (non-ACPI) mode\n"));
 126         } else {
 127                 /* Transition to LEGACY mode */
 128
 129                 status = acpi_hw_set_mode(ACPI_SYS_MODE_LEGACY);
 130
 131                 if (ACPI_FAILURE(status)) {
 132                         ACPI_ERROR((AE_INFO,
 133                                     "Could not exit ACPI mode to legacy mode"));
 134                         return_ACPI_STATUS(status);
 135                 }
 136
 137                 ACPI_DEBUG_PRINT((ACPI_DB_INIT, "ACPI mode disabled\n"));
 138         }
 139
 140         return_ACPI_STATUS(status);
 141 }
 142
 143 ACPI_EXPORT_SYMBOL(acpi_disable)
 144
 145 /*******************************************************************************
 146  *
 147  * FUNCTION:    acpi_enable_event
 148  *
 149  * PARAMETERS:  Event           - The fixed eventto be enabled
 150  *              Flags           - Reserved
 151  *
 152  * RETURN:      Status
 153  *
 154  * DESCRIPTION: Enable an ACPI event (fixed)
 155  *
 156  ******************************************************************************/
 157 acpi_status acpi_enable_event(u32 event, u32 flags)
 158 {
 159         acpi_status status = AE_OK;
 160         u32 value;
 161
 162         ACPI_FUNCTION_TRACE(acpi_enable_event);
 163
 164         /* Decode the Fixed Event */
 165
 166         if (event > ACPI_EVENT_MAX) {
 167                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 168         }
 169
 170         /*
 171          * Enable the requested fixed event (by writing a one to the enable
 172          * register bit)
 173          */
 174         status =
 175             acpi_write_bit_register(acpi_gbl_fixed_event_info[event].
 176                                     enable_register_id, ACPI_ENABLE_EVENT);
 177         if (ACPI_FAILURE(status)) {
 178                 return_ACPI_STATUS(status);
 179         }
 180
 181         /* Make sure that the hardware responded */
 182
 183         status =
 184             acpi_read_bit_register(acpi_gbl_fixed_event_info[event].
 185                                    enable_register_id, &value);
 186         if (ACPI_FAILURE(status)) {
 187                 return_ACPI_STATUS(status);
 188         }
 189
 190         if (value != 1) {
 191                 ACPI_ERROR((AE_INFO,
 192                             "Could not enable %s event",
 193                             acpi_ut_get_event_name(event)));
 194                 return_ACPI_STATUS(AE_NO_HARDWARE_RESPONSE);
 195         }
 196
 197         return_ACPI_STATUS(status);
 198 }
 199
 200 ACPI_EXPORT_SYMBOL(acpi_enable_event)
 201
 202 /*******************************************************************************
 203  *
 204  * FUNCTION:    acpi_set_gpe
 205  *
 206  * PARAMETERS:  gpe_device      - Parent GPE Device
 207  *              gpe_number      - GPE level within the GPE block
 208  *              action          - Enable or disable
 209  *                                Called from ISR or not
 210  *
 211  * RETURN:      Status
 212  *
 213  * DESCRIPTION: Enable or disable an ACPI event (general purpose)
 214  *
 215  ******************************************************************************/
 216 acpi_status acpi_set_gpe(acpi_handle gpe_device, u32 gpe_number, u8 action)
 217 {
 218         acpi_status status = AE_OK;
 219         acpi_cpu_flags flags;
 220         struct acpi_gpe_event_info *gpe_event_info;
 221
 222         ACPI_FUNCTION_TRACE(acpi_set_gpe);
 223
 224         flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
 225
 226         /* Ensure that we have a valid GPE number */
 227
 228         gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
 229         if (!gpe_event_info) {
 230                 status = AE_BAD_PARAMETER;
 231                 goto unlock_and_exit;
 232         }
 233
 234         /* Perform the action */
 235
 236         switch (action) {
 237         case ACPI_GPE_ENABLE:
 238                 status = acpi_ev_enable_gpe(gpe_event_info, TRUE);
 239                 break;
 240
 241         case ACPI_GPE_DISABLE:
 242                 status = acpi_ev_disable_gpe(gpe_event_info);
 243                 break;
 244
 245         default:
 246                 ACPI_ERROR((AE_INFO, "Invalid action\n"));
 247                 status = AE_BAD_PARAMETER;
 248                 break;
 249         }
 250
 251       unlock_and_exit:
 252         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 253         return_ACPI_STATUS(status);
 254 }
 255
 256 ACPI_EXPORT_SYMBOL(acpi_set_gpe)
 257
 258 /*******************************************************************************
 259  *
 260  * FUNCTION:    acpi_enable_gpe
 261  *
 262  * PARAMETERS:  gpe_device      - Parent GPE Device
 263  *              gpe_number      - GPE level within the GPE block
 264  *              type            - Purpose the GPE will be used for
 265  *
 266  * RETURN:      Status
 267  *
 268  * DESCRIPTION: Take a reference to a GPE and enable it if necessary
 269  *
 270  ******************************************************************************/
 271 acpi_status acpi_enable_gpe(acpi_handle gpe_device, u32 gpe_number, u8 type)
 272 {
 273         acpi_status status = AE_OK;
 274         acpi_cpu_flags flags;
 275         struct acpi_gpe_event_info *gpe_event_info;
 276
 277         ACPI_FUNCTION_TRACE(acpi_enable_gpe);
 278
 279         flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
 280
 281         /* Ensure that we have a valid GPE number */
 282
 283         gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
 284         if (!gpe_event_info) {
 285                 status = AE_BAD_PARAMETER;
 286                 goto unlock_and_exit;
 287         }
 288
 289         if (type & ACPI_GPE_TYPE_RUNTIME) {
 290                 if (++gpe_event_info->runtime_count == 1)
 291                         status = acpi_ev_enable_gpe(gpe_event_info, TRUE);
 292
 293                 if (ACPI_FAILURE(status))
 294                         gpe_event_info->runtime_count--;
 295         }
 296
 297         if (type & ACPI_GPE_TYPE_WAKE) {
 298                 if (!(gpe_event_info->flags & ACPI_GPE_CAN_WAKE)) {
 299                         status = AE_BAD_PARAMETER;
 300                         goto unlock_and_exit;
 301                 }
 302
 303                 /*
 304                  * Wake-up GPEs are only enabled right prior to putting the
 305                  * system into a sleep state.
 306                  */
 307                 if (++gpe_event_info->wakeup_count == 1)
 308                         acpi_ev_update_gpe_enable_masks(gpe_event_info);
 309         }
 310
 311 unlock_and_exit:
 312         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 313         return_ACPI_STATUS(status);
 314 }
 315 ACPI_EXPORT_SYMBOL(acpi_enable_gpe)
 316
 317 /*******************************************************************************
 318  *
 319  * FUNCTION:    acpi_disable_gpe
 320  *
 321  * PARAMETERS:  gpe_device      - Parent GPE Device
 322  *              gpe_number      - GPE level within the GPE block
 323  *              type            - Purpose the GPE won't be used for any more
 324  *
 325  * RETURN:      Status
 326  *
 327  * DESCRIPTION: Release a reference to a GPE and disable it if necessary
 328  *
 329  ******************************************************************************/
 330 acpi_status acpi_disable_gpe(acpi_handle gpe_device, u32 gpe_number, u8 type)
 331 {
 332         acpi_status status = AE_OK;
 333         acpi_cpu_flags flags;
 334         struct acpi_gpe_event_info *gpe_event_info;
 335
 336         ACPI_FUNCTION_TRACE(acpi_disable_gpe);
 337
 338         flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
 339         /* Ensure that we have a valid GPE number */
 340
 341         gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
 342         if (!gpe_event_info) {
 343                 status = AE_BAD_PARAMETER;
 344                 goto unlock_and_exit;
 345         }
 346
 347         if ((type & ACPI_GPE_TYPE_WAKE) && gpe_event_info->runtime_count) {
 348                 if (--gpe_event_info->runtime_count == 0)
 349                         acpi_ev_disable_gpe(gpe_event_info);
 350         }
 351
 352         if ((type & ACPI_GPE_TYPE_RUNTIME) && gpe_event_info->wakeup_count) {
 353                 /*
 354                  * Wake-up GPEs are not enabled after leaving system sleep
 355                  * states, so we don't need to disable them here.
 356                  */
 357                 if (--gpe_event_info->wakeup_count == 0)
 358                         acpi_ev_update_gpe_enable_masks(gpe_event_info);
 359         }
 360
 361 unlock_and_exit:
 362         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 363         return_ACPI_STATUS(status);
 364 }
 365 ACPI_EXPORT_SYMBOL(acpi_disable_gpe)
 366
 367 /*******************************************************************************
 368  *
 369  * FUNCTION:    acpi_disable_event
 370  *
 371  * PARAMETERS:  Event           - The fixed eventto be enabled
 372  *              Flags           - Reserved
 373  *
 374  * RETURN:      Status
 375  *
 376  * DESCRIPTION: Disable an ACPI event (fixed)
 377  *
 378  ******************************************************************************/
 379 acpi_status acpi_disable_event(u32 event, u32 flags)
 380 {
 381         acpi_status status = AE_OK;
 382         u32 value;
 383
 384         ACPI_FUNCTION_TRACE(acpi_disable_event);
 385
 386         /* Decode the Fixed Event */
 387
 388         if (event > ACPI_EVENT_MAX) {
 389                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 390         }
 391
 392         /*
 393          * Disable the requested fixed event (by writing a zero to the enable
 394          * register bit)
 395          */
 396         status =
 397             acpi_write_bit_register(acpi_gbl_fixed_event_info[event].
 398                                     enable_register_id, ACPI_DISABLE_EVENT);
 399         if (ACPI_FAILURE(status)) {
 400                 return_ACPI_STATUS(status);
 401         }
 402
 403         status =
 404             acpi_read_bit_register(acpi_gbl_fixed_event_info[event].
 405                                    enable_register_id, &value);
 406         if (ACPI_FAILURE(status)) {
 407                 return_ACPI_STATUS(status);
 408         }
 409
 410         if (value != 0) {
 411                 ACPI_ERROR((AE_INFO,
 412                             "Could not disable %s events",
 413                             acpi_ut_get_event_name(event)));
 414                 return_ACPI_STATUS(AE_NO_HARDWARE_RESPONSE);
 415         }
 416
 417         return_ACPI_STATUS(status);
 418 }
 419
 420 ACPI_EXPORT_SYMBOL(acpi_disable_event)
 421
 422 /*******************************************************************************
 423  *
 424  * FUNCTION:    acpi_clear_event
 425  *
 426  * PARAMETERS:  Event           - The fixed event to be cleared
 427  *
 428  * RETURN:      Status
 429  *
 430  * DESCRIPTION: Clear an ACPI event (fixed)
 431  *
 432  ******************************************************************************/
 433 acpi_status acpi_clear_event(u32 event)
 434 {
 435         acpi_status status = AE_OK;
 436
 437         ACPI_FUNCTION_TRACE(acpi_clear_event);
 438
 439         /* Decode the Fixed Event */
 440
 441         if (event > ACPI_EVENT_MAX) {
 442                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 443         }
 444
 445         /*
 446          * Clear the requested fixed event (By writing a one to the status
 447          * register bit)
 448          */
 449         status =
 450             acpi_write_bit_register(acpi_gbl_fixed_event_info[event].
 451                                     status_register_id, ACPI_CLEAR_STATUS);
 452
 453         return_ACPI_STATUS(status);
 454 }
 455
 456 ACPI_EXPORT_SYMBOL(acpi_clear_event)
 457
 458 /*******************************************************************************
 459  *
 460  * FUNCTION:    acpi_clear_gpe
 461  *
 462  * PARAMETERS:  gpe_device      - Parent GPE Device
 463  *              gpe_number      - GPE level within the GPE block
 464  *              Flags           - Called from an ISR or not
 465  *
 466  * RETURN:      Status
 467  *
 468  * DESCRIPTION: Clear an ACPI event (general purpose)
 469  *
 470  ******************************************************************************/
 471 acpi_status acpi_clear_gpe(acpi_handle gpe_device, u32 gpe_number, u32 flags)
 472 {
 473         acpi_status status = AE_OK;
 474         struct acpi_gpe_event_info *gpe_event_info;
 475
 476         ACPI_FUNCTION_TRACE(acpi_clear_gpe);
 477
 478         /* Use semaphore lock if not executing at interrupt level */
 479
 480         if (flags & ACPI_NOT_ISR) {
 481                 status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
 482                 if (ACPI_FAILURE(status)) {
 483                         return_ACPI_STATUS(status);
 484                 }
 485         }
 486
 487         /* Ensure that we have a valid GPE number */
 488
 489         gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
 490         if (!gpe_event_info) {
 491                 status = AE_BAD_PARAMETER;
 492                 goto unlock_and_exit;
 493         }
 494
 495         status = acpi_hw_clear_gpe(gpe_event_info);
 496
 497       unlock_and_exit:
 498         if (flags & ACPI_NOT_ISR) {
 499                 (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
 500         }
 501         return_ACPI_STATUS(status);
 502 }
 503
 504 ACPI_EXPORT_SYMBOL(acpi_clear_gpe)
 505 /*******************************************************************************
 506  *
 507  * FUNCTION:    acpi_get_event_status
 508  *
 509  * PARAMETERS:  Event           - The fixed event
 510  *              event_status    - Where the current status of the event will
 511  *                                be returned
 512  *
 513  * RETURN:      Status
 514  *
 515  * DESCRIPTION: Obtains and returns the current status of the event
 516  *
 517  ******************************************************************************/
 518 acpi_status acpi_get_event_status(u32 event, acpi_event_status * event_status)
 519 {
 520         acpi_status status = AE_OK;
 521         u32 value;
 522
 523         ACPI_FUNCTION_TRACE(acpi_get_event_status);
 524
 525         if (!event_status) {
 526                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 527         }
 528
 529         /* Decode the Fixed Event */
 530
 531         if (event > ACPI_EVENT_MAX) {
 532                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 533         }
 534
 535         /* Get the status of the requested fixed event */
 536
 537         status =
 538             acpi_read_bit_register(acpi_gbl_fixed_event_info[event].
 539                               enable_register_id, &value);
 540         if (ACPI_FAILURE(status))
 541                 return_ACPI_STATUS(status);
 542
 543         *event_status = value;
 544
 545         status =
 546             acpi_read_bit_register(acpi_gbl_fixed_event_info[event].
 547                               status_register_id, &value);
 548         if (ACPI_FAILURE(status))
 549                 return_ACPI_STATUS(status);
 550
 551         if (value)
 552                 *event_status |= ACPI_EVENT_FLAG_SET;
 553
 554         if (acpi_gbl_fixed_event_handlers[event].handler)
 555                 *event_status |= ACPI_EVENT_FLAG_HANDLE;
 556
 557         return_ACPI_STATUS(status);
 558 }
 559
 560 ACPI_EXPORT_SYMBOL(acpi_get_event_status)
 561
 562 /*******************************************************************************
 563  *
 564  * FUNCTION:    acpi_get_gpe_status
 565  *
 566  * PARAMETERS:  gpe_device      - Parent GPE Device
 567  *              gpe_number      - GPE level within the GPE block
 568  *              Flags           - Called from an ISR or not
 569  *              event_status    - Where the current status of the event will
 570  *                                be returned
 571  *
 572  * RETURN:      Status
 573  *
 574  * DESCRIPTION: Get status of an event (general purpose)
 575  *
 576  ******************************************************************************/
 577 acpi_status
 578 acpi_get_gpe_status(acpi_handle gpe_device,
 579                     u32 gpe_number, u32 flags, acpi_event_status * event_status)
 580 {
 581         acpi_status status = AE_OK;
 582         struct acpi_gpe_event_info *gpe_event_info;
 583
 584         ACPI_FUNCTION_TRACE(acpi_get_gpe_status);
 585
 586         /* Use semaphore lock if not executing at interrupt level */
 587
 588         if (flags & ACPI_NOT_ISR) {
 589                 status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
 590                 if (ACPI_FAILURE(status)) {
 591                         return_ACPI_STATUS(status);
 592                 }
 593         }
 594
 595         /* Ensure that we have a valid GPE number */
 596
 597         gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
 598         if (!gpe_event_info) {
 599                 status = AE_BAD_PARAMETER;
 600                 goto unlock_and_exit;
 601         }
 602
 603         /* Obtain status on the requested GPE number */
 604
 605         status = acpi_hw_get_gpe_status(gpe_event_info, event_status);
 606
 607         if (gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK)
 608                 *event_status |= ACPI_EVENT_FLAG_HANDLE;
 609
 610       unlock_and_exit:
 611         if (flags & ACPI_NOT_ISR) {
 612                 (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
 613         }
 614         return_ACPI_STATUS(status);
 615 }
 616
 617 ACPI_EXPORT_SYMBOL(acpi_get_gpe_status)
 618 /*******************************************************************************
 619  *
 620  * FUNCTION:    acpi_install_gpe_block
 621  *
 622  * PARAMETERS:  gpe_device          - Handle to the parent GPE Block Device
 623  *              gpe_block_address   - Address and space_iD
 624  *              register_count      - Number of GPE register pairs in the block
 625  *              interrupt_number    - H/W interrupt for the block
 626  *
 627  * RETURN:      Status
 628  *
 629  * DESCRIPTION: Create and Install a block of GPE registers
 630  *
 631  ******************************************************************************/
 632 acpi_status
 633 acpi_install_gpe_block(acpi_handle gpe_device,
 634                        struct acpi_generic_address *gpe_block_address,
 635                        u32 register_count, u32 interrupt_number)
 636 {
 637         acpi_status status;
 638         union acpi_operand_object *obj_desc;
 639         struct acpi_namespace_node *node;
 640         struct acpi_gpe_block_info *gpe_block;
 641
 642         ACPI_FUNCTION_TRACE(acpi_install_gpe_block);
 643
 644         if ((!gpe_device) || (!gpe_block_address) || (!register_count)) {
 645                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 646         }
 647
 648         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
 649         if (ACPI_FAILURE(status)) {
 650                 return (status);
 651         }
 652
 653         node = acpi_ns_validate_handle(gpe_device);
 654         if (!node) {
 655                 status = AE_BAD_PARAMETER;
 656                 goto unlock_and_exit;
 657         }
 658
 659         /*
 660          * For user-installed GPE Block Devices, the gpe_block_base_number
 661          * is always zero
 662          */
 663         status =
 664             acpi_ev_create_gpe_block(node, gpe_block_address, register_count, 0,
 665                                      interrupt_number, &gpe_block);
 666         if (ACPI_FAILURE(status)) {
 667                 goto unlock_and_exit;
 668         }
 669
 670         /* Run the _PRW methods and enable the GPEs */
 671
 672         status = acpi_ev_initialize_gpe_block(node, gpe_block);
 673         if (ACPI_FAILURE(status)) {
 674                 goto unlock_and_exit;
 675         }
 676
 677         /* Get the device_object attached to the node */
 678
 679         obj_desc = acpi_ns_get_attached_object(node);
 680         if (!obj_desc) {
 681
 682                 /* No object, create a new one */
 683
 684                 obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_DEVICE);
 685                 if (!obj_desc) {
 686                         status = AE_NO_MEMORY;
 687                         goto unlock_and_exit;
 688                 }
 689
 690                 status =
 691                     acpi_ns_attach_object(node, obj_desc, ACPI_TYPE_DEVICE);
 692
 693                 /* Remove local reference to the object */
 694
 695                 acpi_ut_remove_reference(obj_desc);
 696
 697                 if (ACPI_FAILURE(status)) {
 698                         goto unlock_and_exit;
 699                 }
 700         }
 701
 702         /* Install the GPE block in the device_object */
 703
 704         obj_desc->device.gpe_block = gpe_block;
 705
 706       unlock_and_exit:
 707         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 708         return_ACPI_STATUS(status);
 709 }
 710
 711 ACPI_EXPORT_SYMBOL(acpi_install_gpe_block)
 712
 713 /*******************************************************************************
 714  *
 715  * FUNCTION:    acpi_remove_gpe_block
 716  *
 717  * PARAMETERS:  gpe_device          - Handle to the parent GPE Block Device
 718  *
 719  * RETURN:      Status
 720  *
 721  * DESCRIPTION: Remove a previously installed block of GPE registers
 722  *
 723  ******************************************************************************/
 724 acpi_status acpi_remove_gpe_block(acpi_handle gpe_device)
 725 {
 726         union acpi_operand_object *obj_desc;
 727         acpi_status status;
 728         struct acpi_namespace_node *node;
 729
 730         ACPI_FUNCTION_TRACE(acpi_remove_gpe_block);
 731
 732         if (!gpe_device) {
 733                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 734         }
 735
 736         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
 737         if (ACPI_FAILURE(status)) {
 738                 return (status);
 739         }
 740
 741         node = acpi_ns_validate_handle(gpe_device);
 742         if (!node) {
 743                 status = AE_BAD_PARAMETER;
 744                 goto unlock_and_exit;
 745         }
 746
 747         /* Get the device_object attached to the node */
 748
 749         obj_desc = acpi_ns_get_attached_object(node);
 750         if (!obj_desc || !obj_desc->device.gpe_block) {
 751                 return_ACPI_STATUS(AE_NULL_OBJECT);
 752         }
 753
 754         /* Delete the GPE block (but not the device_object) */
 755
 756         status = acpi_ev_delete_gpe_block(obj_desc->device.gpe_block);
 757         if (ACPI_SUCCESS(status)) {
 758                 obj_desc->device.gpe_block = NULL;
 759         }
 760
 761       unlock_and_exit:
 762         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 763         return_ACPI_STATUS(status);
 764 }
 765
 766 ACPI_EXPORT_SYMBOL(acpi_remove_gpe_block)
 767
 768 /*******************************************************************************
 769  *
 770  * FUNCTION:    acpi_get_gpe_device
 771  *
 772  * PARAMETERS:  Index               - System GPE index (0-current_gpe_count)
 773  *              gpe_device          - Where the parent GPE Device is returned
 774  *
 775  * RETURN:      Status
 776  *
 777  * DESCRIPTION: Obtain the GPE device associated with the input index. A NULL
 778  *              gpe device indicates that the gpe number is contained in one of
 779  *              the FADT-defined gpe blocks. Otherwise, the GPE block device.
 780  *
 781  ******************************************************************************/
 782 acpi_status
 783 acpi_get_gpe_device(u32 index, acpi_handle *gpe_device)
 784 {
 785         struct acpi_gpe_device_info info;
 786         acpi_status status;
 787
 788         ACPI_FUNCTION_TRACE(acpi_get_gpe_device);
 789
 790         if (!gpe_device) {
 791                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 792         }
 793
 794         if (index >= acpi_current_gpe_count) {
 795                 return_ACPI_STATUS(AE_NOT_EXIST);
 796         }
 797
 798         /* Setup and walk the GPE list */
 799
 800         info.index = index;
 801         info.status = AE_NOT_EXIST;
 802         info.gpe_device = NULL;
 803         info.next_block_base_index = 0;
 804
 805         status = acpi_ev_walk_gpe_list(acpi_ev_get_gpe_device, &info);
 806         if (ACPI_FAILURE(status)) {
 807                 return_ACPI_STATUS(status);
 808         }
 809
 810         *gpe_device = info.gpe_device;
 811         return_ACPI_STATUS(info.status);
 812 }
 813
 814 ACPI_EXPORT_SYMBOL(acpi_get_gpe_device)
 815
 816 /*******************************************************************************
 817  *
 818  * FUNCTION:    acpi_ev_get_gpe_device
 819  *
 820  * PARAMETERS:  GPE_WALK_CALLBACK
 821  *
 822  * RETURN:      Status
 823  *
 824  * DESCRIPTION: Matches the input GPE index (0-current_gpe_count) with a GPE
 825  *              block device. NULL if the GPE is one of the FADT-defined GPEs.
 826  *
 827  ******************************************************************************/
 828 static acpi_status
 829 acpi_ev_get_gpe_device(struct acpi_gpe_xrupt_info *gpe_xrupt_info,
 830                        struct acpi_gpe_block_info *gpe_block, void *context)
 831 {
 832         struct acpi_gpe_device_info *info = context;
 833
 834         /* Increment Index by the number of GPEs in this block */
 835
 836         info->next_block_base_index +=
 837             (gpe_block->register_count * ACPI_GPE_REGISTER_WIDTH);
 838
 839         if (info->index < info->next_block_base_index) {
 840                 /*
 841                  * The GPE index is within this block, get the node. Leave the node
 842                  * NULL for the FADT-defined GPEs
 843                  */
 844                 if ((gpe_block->node)->type == ACPI_TYPE_DEVICE) {
 845                         info->gpe_device = gpe_block->node;
 846                 }
 847
 848                 info->status = AE_OK;
 849                 return (AE_CTRL_END);
 850         }
 851
 852         return (AE_OK);
 853 }
 854
 855 /******************************************************************************
 856  *
 857  * FUNCTION:    acpi_disable_all_gpes
 858  *
 859  * PARAMETERS:  None
 860  *
 861  * RETURN:      Status
 862  *
 863  * DESCRIPTION: Disable and clear all GPEs in all GPE blocks
 864  *
 865  ******************************************************************************/
 866
 867 acpi_status acpi_disable_all_gpes(void)
 868 {
 869         acpi_status status;
 870
 871         ACPI_FUNCTION_TRACE(acpi_disable_all_gpes);
 872
 873         status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
 874         if (ACPI_FAILURE(status)) {
 875                 return_ACPI_STATUS(status);
 876         }
 877
 878         status = acpi_hw_disable_all_gpes();
 879         (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
 880
 881         return_ACPI_STATUS(status);
 882 }
 883
 884 /******************************************************************************
 885  *
 886  * FUNCTION:    acpi_enable_all_runtime_gpes
 887  *
 888  * PARAMETERS:  None
 889  *
 890  * RETURN:      Status
 891  *
 892  * DESCRIPTION: Enable all "runtime" GPEs, in all GPE blocks
 893  *
 894  ******************************************************************************/
 895
 896 acpi_status acpi_enable_all_runtime_gpes(void)
 897 {
 898         acpi_status status;
 899
 900         ACPI_FUNCTION_TRACE(acpi_enable_all_runtime_gpes);
 901
 902         status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
 903         if (ACPI_FAILURE(status)) {
 904                 return_ACPI_STATUS(status);
 905         }
 906
 907         status = acpi_hw_enable_all_runtime_gpes();
 908         (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
 909
 910         return_ACPI_STATUS(status);
 911 }