drivers/acpi/events/evxfevnt.c

   1 /******************************************************************************
   2  *
   3  * Module Name: evxfevnt - External Interfaces, ACPI event disable/enable
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2006, R. Byron Moore
   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/module.h>
  45
  46 #include <acpi/acpi.h>
  47 #include <acpi/acevents.h>
  48 #include <acpi/acnamesp.h>
  49
  50 #define _COMPONENT          ACPI_EVENTS
  51 ACPI_MODULE_NAME("evxfevnt")
  52
  53 /*******************************************************************************
  54  *
  55  * FUNCTION:    acpi_enable
  56  *
  57  * PARAMETERS:  None
  58  *
  59  * RETURN:      Status
  60  *
  61  * DESCRIPTION: Transfers the system into ACPI mode.
  62  *
  63  ******************************************************************************/
  64 acpi_status acpi_enable(void)
  65 {
  66         acpi_status status = AE_OK;
  67
  68         ACPI_FUNCTION_TRACE("acpi_enable");
  69
  70         /* Make sure we have the FADT */
  71
  72         if (!acpi_gbl_FADT) {
  73                 ACPI_WARNING((AE_INFO, "No FADT information present!"));
  74                 return_ACPI_STATUS(AE_NO_ACPI_TABLES);
  75         }
  76
  77         if (acpi_hw_get_mode() == ACPI_SYS_MODE_ACPI) {
  78                 ACPI_DEBUG_PRINT((ACPI_DB_INIT,
  79                                   "System is already in ACPI mode\n"));
  80         } else {
  81                 /* Transition to ACPI mode */
  82
  83                 status = acpi_hw_set_mode(ACPI_SYS_MODE_ACPI);
  84                 if (ACPI_FAILURE(status)) {
  85                         ACPI_ERROR((AE_INFO,
  86                                     "Could not transition to ACPI mode"));
  87                         return_ACPI_STATUS(status);
  88                 }
  89
  90                 ACPI_DEBUG_PRINT((ACPI_DB_INIT,
  91                                   "Transition to ACPI mode successful\n"));
  92         }
  93
  94         return_ACPI_STATUS(status);
  95 }
  96
  97 /*******************************************************************************
  98  *
  99  * FUNCTION:    acpi_disable
 100  *
 101  * PARAMETERS:  None
 102  *
 103  * RETURN:      Status
 104  *
 105  * DESCRIPTION: Transfers the system into LEGACY (non-ACPI) mode.
 106  *
 107  ******************************************************************************/
 108
 109 acpi_status acpi_disable(void)
 110 {
 111         acpi_status status = AE_OK;
 112
 113         ACPI_FUNCTION_TRACE("acpi_disable");
 114
 115         if (!acpi_gbl_FADT) {
 116                 ACPI_WARNING((AE_INFO, "No FADT information present!"));
 117                 return_ACPI_STATUS(AE_NO_ACPI_TABLES);
 118         }
 119
 120         if (acpi_hw_get_mode() == ACPI_SYS_MODE_LEGACY) {
 121                 ACPI_DEBUG_PRINT((ACPI_DB_INIT,
 122                                   "System is already in legacy (non-ACPI) mode\n"));
 123         } else {
 124                 /* Transition to LEGACY mode */
 125
 126                 status = acpi_hw_set_mode(ACPI_SYS_MODE_LEGACY);
 127
 128                 if (ACPI_FAILURE(status)) {
 129                         ACPI_ERROR((AE_INFO,
 130                                     "Could not exit ACPI mode to legacy mode"));
 131                         return_ACPI_STATUS(status);
 132                 }
 133
 134                 ACPI_DEBUG_PRINT((ACPI_DB_INIT, "ACPI mode disabled\n"));
 135         }
 136
 137         return_ACPI_STATUS(status);
 138 }
 139
 140 /*******************************************************************************
 141  *
 142  * FUNCTION:    acpi_enable_event
 143  *
 144  * PARAMETERS:  Event           - The fixed eventto be enabled
 145  *              Flags           - Reserved
 146  *
 147  * RETURN:      Status
 148  *
 149  * DESCRIPTION: Enable an ACPI event (fixed)
 150  *
 151  ******************************************************************************/
 152
 153 acpi_status acpi_enable_event(u32 event, u32 flags)
 154 {
 155         acpi_status status = AE_OK;
 156         u32 value;
 157
 158         ACPI_FUNCTION_TRACE("acpi_enable_event");
 159
 160         /* Decode the Fixed Event */
 161
 162         if (event > ACPI_EVENT_MAX) {
 163                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 164         }
 165
 166         /*
 167          * Enable the requested fixed event (by writing a one to the
 168          * enable register bit)
 169          */
 170         status =
 171             acpi_set_register(acpi_gbl_fixed_event_info[event].
 172                               enable_register_id, 1, ACPI_MTX_LOCK);
 173         if (ACPI_FAILURE(status)) {
 174                 return_ACPI_STATUS(status);
 175         }
 176
 177         /* Make sure that the hardware responded */
 178
 179         status =
 180             acpi_get_register(acpi_gbl_fixed_event_info[event].
 181                               enable_register_id, &value, ACPI_MTX_LOCK);
 182         if (ACPI_FAILURE(status)) {
 183                 return_ACPI_STATUS(status);
 184         }
 185
 186         if (value != 1) {
 187                 ACPI_ERROR((AE_INFO,
 188                             "Could not enable %s event",
 189                             acpi_ut_get_event_name(event)));
 190                 return_ACPI_STATUS(AE_NO_HARDWARE_RESPONSE);
 191         }
 192
 193         return_ACPI_STATUS(status);
 194 }
 195
 196 EXPORT_SYMBOL(acpi_enable_event);
 197
 198 /*******************************************************************************
 199  *
 200  * FUNCTION:    acpi_set_gpe_type
 201  *
 202  * PARAMETERS:  gpe_device      - Parent GPE Device
 203  *              gpe_number      - GPE level within the GPE block
 204  *              Type            - New GPE type
 205  *
 206  * RETURN:      Status
 207  *
 208  * DESCRIPTION: Set the type of an individual GPE
 209  *
 210  ******************************************************************************/
 211
 212 acpi_status acpi_set_gpe_type(acpi_handle gpe_device, u32 gpe_number, u8 type)
 213 {
 214         acpi_status status = AE_OK;
 215         struct acpi_gpe_event_info *gpe_event_info;
 216
 217         ACPI_FUNCTION_TRACE("acpi_set_gpe_type");
 218
 219         /* Ensure that we have a valid GPE number */
 220
 221         gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
 222         if (!gpe_event_info) {
 223                 status = AE_BAD_PARAMETER;
 224                 goto unlock_and_exit;
 225         }
 226
 227         if ((gpe_event_info->flags & ACPI_GPE_TYPE_MASK) == type) {
 228                 return_ACPI_STATUS(AE_OK);
 229         }
 230
 231         /* Set the new type (will disable GPE if currently enabled) */
 232
 233         status = acpi_ev_set_gpe_type(gpe_event_info, type);
 234
 235       unlock_and_exit:
 236         return_ACPI_STATUS(status);
 237 }
 238
 239 EXPORT_SYMBOL(acpi_set_gpe_type);
 240
 241 /*******************************************************************************
 242  *
 243  * FUNCTION:    acpi_enable_gpe
 244  *
 245  * PARAMETERS:  gpe_device      - Parent GPE Device
 246  *              gpe_number      - GPE level within the GPE block
 247  *              Flags           - Just enable, or also wake enable?
 248  *                                Called from ISR or not
 249  *
 250  * RETURN:      Status
 251  *
 252  * DESCRIPTION: Enable an ACPI event (general purpose)
 253  *
 254  ******************************************************************************/
 255
 256 acpi_status acpi_enable_gpe(acpi_handle gpe_device, u32 gpe_number, u32 flags)
 257 {
 258         acpi_status status = AE_OK;
 259         struct acpi_gpe_event_info *gpe_event_info;
 260
 261         ACPI_FUNCTION_TRACE("acpi_enable_gpe");
 262
 263         /* Use semaphore lock if not executing at interrupt level */
 264
 265         if (flags & ACPI_NOT_ISR) {
 266                 status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
 267                 if (ACPI_FAILURE(status)) {
 268                         return_ACPI_STATUS(status);
 269                 }
 270         }
 271
 272         /* Ensure that we have a valid GPE number */
 273
 274         gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
 275         if (!gpe_event_info) {
 276                 status = AE_BAD_PARAMETER;
 277                 goto unlock_and_exit;
 278         }
 279
 280         /* Perform the enable */
 281
 282         status = acpi_ev_enable_gpe(gpe_event_info, TRUE);
 283
 284       unlock_and_exit:
 285         if (flags & ACPI_NOT_ISR) {
 286                 (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
 287         }
 288         return_ACPI_STATUS(status);
 289 }
 290
 291 EXPORT_SYMBOL(acpi_enable_gpe);
 292
 293 /*******************************************************************************
 294  *
 295  * FUNCTION:    acpi_disable_gpe
 296  *
 297  * PARAMETERS:  gpe_device      - Parent GPE Device
 298  *              gpe_number      - GPE level within the GPE block
 299  *              Flags           - Just disable, or also wake disable?
 300  *                                Called from ISR or not
 301  *
 302  * RETURN:      Status
 303  *
 304  * DESCRIPTION: Disable an ACPI event (general purpose)
 305  *
 306  ******************************************************************************/
 307
 308 acpi_status acpi_disable_gpe(acpi_handle gpe_device, u32 gpe_number, u32 flags)
 309 {
 310         acpi_status status = AE_OK;
 311         struct acpi_gpe_event_info *gpe_event_info;
 312
 313         ACPI_FUNCTION_TRACE("acpi_disable_gpe");
 314
 315         /* Use semaphore lock if not executing at interrupt level */
 316
 317         if (flags & ACPI_NOT_ISR) {
 318                 status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
 319                 if (ACPI_FAILURE(status)) {
 320                         return_ACPI_STATUS(status);
 321                 }
 322         }
 323
 324         /* Ensure that we have a valid GPE number */
 325
 326         gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
 327         if (!gpe_event_info) {
 328                 status = AE_BAD_PARAMETER;
 329                 goto unlock_and_exit;
 330         }
 331
 332         status = acpi_ev_disable_gpe(gpe_event_info);
 333
 334       unlock_and_exit:
 335         if (flags & ACPI_NOT_ISR) {
 336                 (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
 337         }
 338         return_ACPI_STATUS(status);
 339 }
 340
 341 /*******************************************************************************
 342  *
 343  * FUNCTION:    acpi_disable_event
 344  *
 345  * PARAMETERS:  Event           - The fixed eventto be enabled
 346  *              Flags           - Reserved
 347  *
 348  * RETURN:      Status
 349  *
 350  * DESCRIPTION: Disable an ACPI event (fixed)
 351  *
 352  ******************************************************************************/
 353
 354 acpi_status acpi_disable_event(u32 event, u32 flags)
 355 {
 356         acpi_status status = AE_OK;
 357         u32 value;
 358
 359         ACPI_FUNCTION_TRACE("acpi_disable_event");
 360
 361         /* Decode the Fixed Event */
 362
 363         if (event > ACPI_EVENT_MAX) {
 364                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 365         }
 366
 367         /*
 368          * Disable the requested fixed event (by writing a zero to the
 369          * enable register bit)
 370          */
 371         status =
 372             acpi_set_register(acpi_gbl_fixed_event_info[event].
 373                               enable_register_id, 0, ACPI_MTX_LOCK);
 374         if (ACPI_FAILURE(status)) {
 375                 return_ACPI_STATUS(status);
 376         }
 377
 378         status =
 379             acpi_get_register(acpi_gbl_fixed_event_info[event].
 380                               enable_register_id, &value, ACPI_MTX_LOCK);
 381         if (ACPI_FAILURE(status)) {
 382                 return_ACPI_STATUS(status);
 383         }
 384
 385         if (value != 0) {
 386                 ACPI_ERROR((AE_INFO,
 387                             "Could not disable %s events",
 388                             acpi_ut_get_event_name(event)));
 389                 return_ACPI_STATUS(AE_NO_HARDWARE_RESPONSE);
 390         }
 391
 392         return_ACPI_STATUS(status);
 393 }
 394
 395 EXPORT_SYMBOL(acpi_disable_event);
 396
 397 /*******************************************************************************
 398  *
 399  * FUNCTION:    acpi_clear_event
 400  *
 401  * PARAMETERS:  Event           - The fixed event to be cleared
 402  *
 403  * RETURN:      Status
 404  *
 405  * DESCRIPTION: Clear an ACPI event (fixed)
 406  *
 407  ******************************************************************************/
 408
 409 acpi_status acpi_clear_event(u32 event)
 410 {
 411         acpi_status status = AE_OK;
 412
 413         ACPI_FUNCTION_TRACE("acpi_clear_event");
 414
 415         /* Decode the Fixed Event */
 416
 417         if (event > ACPI_EVENT_MAX) {
 418                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 419         }
 420
 421         /*
 422          * Clear the requested fixed event (By writing a one to the
 423          * status register bit)
 424          */
 425         status =
 426             acpi_set_register(acpi_gbl_fixed_event_info[event].
 427                               status_register_id, 1, ACPI_MTX_LOCK);
 428
 429         return_ACPI_STATUS(status);
 430 }
 431
 432 EXPORT_SYMBOL(acpi_clear_event);
 433
 434 /*******************************************************************************
 435  *
 436  * FUNCTION:    acpi_clear_gpe
 437  *
 438  * PARAMETERS:  gpe_device      - Parent GPE Device
 439  *              gpe_number      - GPE level within the GPE block
 440  *              Flags           - Called from an ISR or not
 441  *
 442  * RETURN:      Status
 443  *
 444  * DESCRIPTION: Clear an ACPI event (general purpose)
 445  *
 446  ******************************************************************************/
 447
 448 acpi_status acpi_clear_gpe(acpi_handle gpe_device, u32 gpe_number, u32 flags)
 449 {
 450         acpi_status status = AE_OK;
 451         struct acpi_gpe_event_info *gpe_event_info;
 452
 453         ACPI_FUNCTION_TRACE("acpi_clear_gpe");
 454
 455         /* Use semaphore lock if not executing at interrupt level */
 456
 457         if (flags & ACPI_NOT_ISR) {
 458                 status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
 459                 if (ACPI_FAILURE(status)) {
 460                         return_ACPI_STATUS(status);
 461                 }
 462         }
 463
 464         /* Ensure that we have a valid GPE number */
 465
 466         gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
 467         if (!gpe_event_info) {
 468                 status = AE_BAD_PARAMETER;
 469                 goto unlock_and_exit;
 470         }
 471
 472         status = acpi_hw_clear_gpe(gpe_event_info);
 473
 474       unlock_and_exit:
 475         if (flags & ACPI_NOT_ISR) {
 476                 (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
 477         }
 478         return_ACPI_STATUS(status);
 479 }
 480
 481 #ifdef ACPI_FUTURE_USAGE
 482 /*******************************************************************************
 483  *
 484  * FUNCTION:    acpi_get_event_status
 485  *
 486  * PARAMETERS:  Event           - The fixed event
 487  *              event_status    - Where the current status of the event will
 488  *                                be returned
 489  *
 490  * RETURN:      Status
 491  *
 492  * DESCRIPTION: Obtains and returns the current status of the event
 493  *
 494  ******************************************************************************/
 495
 496 acpi_status acpi_get_event_status(u32 event, acpi_event_status * event_status)
 497 {
 498         acpi_status status = AE_OK;
 499
 500         ACPI_FUNCTION_TRACE("acpi_get_event_status");
 501
 502         if (!event_status) {
 503                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 504         }
 505
 506         /* Decode the Fixed Event */
 507
 508         if (event > ACPI_EVENT_MAX) {
 509                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 510         }
 511
 512         /* Get the status of the requested fixed event */
 513
 514         status =
 515             acpi_get_register(acpi_gbl_fixed_event_info[event].
 516                               status_register_id, event_status, ACPI_MTX_LOCK);
 517
 518         return_ACPI_STATUS(status);
 519 }
 520
 521 /*******************************************************************************
 522  *
 523  * FUNCTION:    acpi_get_gpe_status
 524  *
 525  * PARAMETERS:  gpe_device      - Parent GPE Device
 526  *              gpe_number      - GPE level within the GPE block
 527  *              Flags           - Called from an ISR or not
 528  *              event_status    - Where the current status of the event will
 529  *                                be returned
 530  *
 531  * RETURN:      Status
 532  *
 533  * DESCRIPTION: Get status of an event (general purpose)
 534  *
 535  ******************************************************************************/
 536
 537 acpi_status
 538 acpi_get_gpe_status(acpi_handle gpe_device,
 539                     u32 gpe_number, u32 flags, acpi_event_status * event_status)
 540 {
 541         acpi_status status = AE_OK;
 542         struct acpi_gpe_event_info *gpe_event_info;
 543
 544         ACPI_FUNCTION_TRACE("acpi_get_gpe_status");
 545
 546         /* Use semaphore lock if not executing at interrupt level */
 547
 548         if (flags & ACPI_NOT_ISR) {
 549                 status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
 550                 if (ACPI_FAILURE(status)) {
 551                         return_ACPI_STATUS(status);
 552                 }
 553         }
 554
 555         /* Ensure that we have a valid GPE number */
 556
 557         gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
 558         if (!gpe_event_info) {
 559                 status = AE_BAD_PARAMETER;
 560                 goto unlock_and_exit;
 561         }
 562
 563         /* Obtain status on the requested GPE number */
 564
 565         status = acpi_hw_get_gpe_status(gpe_event_info, event_status);
 566
 567       unlock_and_exit:
 568         if (flags & ACPI_NOT_ISR) {
 569                 (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
 570         }
 571         return_ACPI_STATUS(status);
 572 }
 573 #endif                          /*  ACPI_FUTURE_USAGE  */
 574
 575 /*******************************************************************************
 576  *
 577  * FUNCTION:    acpi_install_gpe_block
 578  *
 579  * PARAMETERS:  gpe_device          - Handle to the parent GPE Block Device
 580  *              gpe_block_address   - Address and space_iD
 581  *              register_count      - Number of GPE register pairs in the block
 582  *              interrupt_number    - H/W interrupt for the block
 583  *
 584  * RETURN:      Status
 585  *
 586  * DESCRIPTION: Create and Install a block of GPE registers
 587  *
 588  ******************************************************************************/
 589
 590 acpi_status
 591 acpi_install_gpe_block(acpi_handle gpe_device,
 592                        struct acpi_generic_address *gpe_block_address,
 593                        u32 register_count, u32 interrupt_number)
 594 {
 595         acpi_status status;
 596         union acpi_operand_object *obj_desc;
 597         struct acpi_namespace_node *node;
 598         struct acpi_gpe_block_info *gpe_block;
 599
 600         ACPI_FUNCTION_TRACE("acpi_install_gpe_block");
 601
 602         if ((!gpe_device) || (!gpe_block_address) || (!register_count)) {
 603                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 604         }
 605
 606         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
 607         if (ACPI_FAILURE(status)) {
 608                 return (status);
 609         }
 610
 611         node = acpi_ns_map_handle_to_node(gpe_device);
 612         if (!node) {
 613                 status = AE_BAD_PARAMETER;
 614                 goto unlock_and_exit;
 615         }
 616
 617         /*
 618          * For user-installed GPE Block Devices, the gpe_block_base_number
 619          * is always zero
 620          */
 621         status =
 622             acpi_ev_create_gpe_block(node, gpe_block_address, register_count, 0,
 623                                      interrupt_number, &gpe_block);
 624         if (ACPI_FAILURE(status)) {
 625                 goto unlock_and_exit;
 626         }
 627
 628         /* Run the _PRW methods and enable the GPEs */
 629
 630         status = acpi_ev_initialize_gpe_block(node, gpe_block);
 631         if (ACPI_FAILURE(status)) {
 632                 goto unlock_and_exit;
 633         }
 634
 635         /* Get the device_object attached to the node */
 636
 637         obj_desc = acpi_ns_get_attached_object(node);
 638         if (!obj_desc) {
 639                 /* No object, create a new one */
 640
 641                 obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_DEVICE);
 642                 if (!obj_desc) {
 643                         status = AE_NO_MEMORY;
 644                         goto unlock_and_exit;
 645                 }
 646
 647                 status =
 648                     acpi_ns_attach_object(node, obj_desc, ACPI_TYPE_DEVICE);
 649
 650                 /* Remove local reference to the object */
 651
 652                 acpi_ut_remove_reference(obj_desc);
 653
 654                 if (ACPI_FAILURE(status)) {
 655                         goto unlock_and_exit;
 656                 }
 657         }
 658
 659         /* Install the GPE block in the device_object */
 660
 661         obj_desc->device.gpe_block = gpe_block;
 662
 663       unlock_and_exit:
 664         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 665         return_ACPI_STATUS(status);
 666 }
 667
 668 EXPORT_SYMBOL(acpi_install_gpe_block);
 669
 670 /*******************************************************************************
 671  *
 672  * FUNCTION:    acpi_remove_gpe_block
 673  *
 674  * PARAMETERS:  gpe_device          - Handle to the parent GPE Block Device
 675  *
 676  * RETURN:      Status
 677  *
 678  * DESCRIPTION: Remove a previously installed block of GPE registers
 679  *
 680  ******************************************************************************/
 681
 682 acpi_status acpi_remove_gpe_block(acpi_handle gpe_device)
 683 {
 684         union acpi_operand_object *obj_desc;
 685         acpi_status status;
 686         struct acpi_namespace_node *node;
 687
 688         ACPI_FUNCTION_TRACE("acpi_remove_gpe_block");
 689
 690         if (!gpe_device) {
 691                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 692         }
 693
 694         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
 695         if (ACPI_FAILURE(status)) {
 696                 return (status);
 697         }
 698
 699         node = acpi_ns_map_handle_to_node(gpe_device);
 700         if (!node) {
 701                 status = AE_BAD_PARAMETER;
 702                 goto unlock_and_exit;
 703         }
 704
 705         /* Get the device_object attached to the node */
 706
 707         obj_desc = acpi_ns_get_attached_object(node);
 708         if (!obj_desc || !obj_desc->device.gpe_block) {
 709                 return_ACPI_STATUS(AE_NULL_OBJECT);
 710         }
 711
 712         /* Delete the GPE block (but not the device_object) */
 713
 714         status = acpi_ev_delete_gpe_block(obj_desc->device.gpe_block);
 715         if (ACPI_SUCCESS(status)) {
 716                 obj_desc->device.gpe_block = NULL;
 717         }
 718
 719       unlock_and_exit:
 720         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 721         return_ACPI_STATUS(status);
 722 }
 723
 724 EXPORT_SYMBOL(acpi_remove_gpe_block);