git.oblomov.eu Git - linux-2.6/blob - 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 - 2005, 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_DEBUG_PRINT((ACPI_DB_WARN,
  74                                   "No FADT information present!\n"));
  75                 return_ACPI_STATUS(AE_NO_ACPI_TABLES);
  76         }
  77
  78         if (acpi_hw_get_mode() == ACPI_SYS_MODE_ACPI) {
  79                 ACPI_DEBUG_PRINT((ACPI_DB_INIT,
  80                                   "System is already in ACPI mode\n"));
  81         } else {
  82                 /* Transition to ACPI mode */
  83
  84                 status = acpi_hw_set_mode(ACPI_SYS_MODE_ACPI);
  85                 if (ACPI_FAILURE(status)) {
  86                         ACPI_REPORT_ERROR(("Could not transition to ACPI mode.\n"));
  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_DEBUG_PRINT((ACPI_DB_WARN,
 117                                   "No FADT information present!\n"));
 118                 return_ACPI_STATUS(AE_NO_ACPI_TABLES);
 119         }
 120
 121         if (acpi_hw_get_mode() == ACPI_SYS_MODE_LEGACY) {
 122                 ACPI_DEBUG_PRINT((ACPI_DB_INIT,
 123                                   "System is already in legacy (non-ACPI) mode\n"));
 124         } else {
 125                 /* Transition to LEGACY mode */
 126
 127                 status = acpi_hw_set_mode(ACPI_SYS_MODE_LEGACY);
 128
 129                 if (ACPI_FAILURE(status)) {
 130                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 131                                           "Could not exit ACPI mode to legacy mode"));
 132                         return_ACPI_STATUS(status);
 133                 }
 134
 135                 ACPI_DEBUG_PRINT((ACPI_DB_INIT, "ACPI mode disabled\n"));
 136         }
 137
 138         return_ACPI_STATUS(status);
 139 }
 140
 141 /*******************************************************************************
 142  *
 143  * FUNCTION:    acpi_enable_event
 144  *
 145  * PARAMETERS:  Event           - The fixed eventto be enabled
 146  *              Flags           - Reserved
 147  *
 148  * RETURN:      Status
 149  *
 150  * DESCRIPTION: Enable an ACPI event (fixed)
 151  *
 152  ******************************************************************************/
 153
 154 acpi_status acpi_enable_event(u32 event, u32 flags)
 155 {
 156         acpi_status status = AE_OK;
 157         u32 value;
 158
 159         ACPI_FUNCTION_TRACE("acpi_enable_event");
 160
 161         /* Decode the Fixed Event */
 162
 163         if (event > ACPI_EVENT_MAX) {
 164                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 165         }
 166
 167         /*
 168          * Enable the requested fixed event (by writing a one to the
 169          * enable register bit)
 170          */
 171         status =
 172             acpi_set_register(acpi_gbl_fixed_event_info[event].
 173                               enable_register_id, 1, ACPI_MTX_LOCK);
 174         if (ACPI_FAILURE(status)) {
 175                 return_ACPI_STATUS(status);
 176         }
 177
 178         /* Make sure that the hardware responded */
 179
 180         status =
 181             acpi_get_register(acpi_gbl_fixed_event_info[event].
 182                               enable_register_id, &value, ACPI_MTX_LOCK);
 183         if (ACPI_FAILURE(status)) {
 184                 return_ACPI_STATUS(status);
 185         }
 186
 187         if (value != 1) {
 188                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 189                                   "Could not enable %s event\n",
 190                                   acpi_ut_get_event_name(event)));
 191                 return_ACPI_STATUS(AE_NO_HARDWARE_RESPONSE);
 192         }
 193
 194         return_ACPI_STATUS(status);
 195 }
 196
 197 EXPORT_SYMBOL(acpi_enable_event);
 198
 199 /*******************************************************************************
 200  *
 201  * FUNCTION:    acpi_set_gpe_type
 202  *
 203  * PARAMETERS:  gpe_device      - Parent GPE Device
 204  *              gpe_number      - GPE level within the GPE block
 205  *              Type            - New GPE type
 206  *
 207  * RETURN:      Status
 208  *
 209  * DESCRIPTION: Set the type of an individual GPE
 210  *
 211  ******************************************************************************/
 212
 213 acpi_status acpi_set_gpe_type(acpi_handle gpe_device, u32 gpe_number, u8 type)
 214 {
 215         acpi_status status = AE_OK;
 216         struct acpi_gpe_event_info *gpe_event_info;
 217
 218         ACPI_FUNCTION_TRACE("acpi_set_gpe_type");
 219
 220         /* Ensure that we have a valid GPE number */
 221
 222         gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
 223         if (!gpe_event_info) {
 224                 status = AE_BAD_PARAMETER;
 225                 goto unlock_and_exit;
 226         }
 227
 228         if ((gpe_event_info->flags & ACPI_GPE_TYPE_MASK) == type) {
 229                 return_ACPI_STATUS(AE_OK);
 230         }
 231
 232         /* Set the new type (will disable GPE if currently enabled) */
 233
 234         status = acpi_ev_set_gpe_type(gpe_event_info, type);
 235
 236       unlock_and_exit:
 237         return_ACPI_STATUS(status);
 238 }
 239
 240 EXPORT_SYMBOL(acpi_set_gpe_type);
 241
 242 /*******************************************************************************
 243  *
 244  * FUNCTION:    acpi_enable_gpe
 245  *
 246  * PARAMETERS:  gpe_device      - Parent GPE Device
 247  *              gpe_number      - GPE level within the GPE block
 248  *              Flags           - Just enable, or also wake enable?
 249  *                                Called from ISR or not
 250  *
 251  * RETURN:      Status
 252  *
 253  * DESCRIPTION: Enable an ACPI event (general purpose)
 254  *
 255  ******************************************************************************/
 256
 257 acpi_status acpi_enable_gpe(acpi_handle gpe_device, u32 gpe_number, u32 flags)
 258 {
 259         acpi_status status = AE_OK;
 260         struct acpi_gpe_event_info *gpe_event_info;
 261
 262         ACPI_FUNCTION_TRACE("acpi_enable_gpe");
 263
 264         /* Use semaphore lock if not executing at interrupt level */
 265
 266         if (flags & ACPI_NOT_ISR) {
 267                 status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
 268                 if (ACPI_FAILURE(status)) {
 269                         return_ACPI_STATUS(status);
 270                 }
 271         }
 272
 273         /* Ensure that we have a valid GPE number */
 274
 275         gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
 276         if (!gpe_event_info) {
 277                 status = AE_BAD_PARAMETER;
 278                 goto unlock_and_exit;
 279         }
 280
 281         /* Perform the enable */
 282
 283         status = acpi_ev_enable_gpe(gpe_event_info, TRUE);
 284
 285       unlock_and_exit:
 286         if (flags & ACPI_NOT_ISR) {
 287                 (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
 288         }
 289         return_ACPI_STATUS(status);
 290 }
 291
 292 EXPORT_SYMBOL(acpi_enable_gpe);
 293
 294 /*******************************************************************************
 295  *
 296  * FUNCTION:    acpi_disable_gpe
 297  *
 298  * PARAMETERS:  gpe_device      - Parent GPE Device
 299  *              gpe_number      - GPE level within the GPE block
 300  *              Flags           - Just disable, or also wake disable?
 301  *                                Called from ISR or not
 302  *
 303  * RETURN:      Status
 304  *
 305  * DESCRIPTION: Disable an ACPI event (general purpose)
 306  *
 307  ******************************************************************************/
 308
 309 acpi_status acpi_disable_gpe(acpi_handle gpe_device, u32 gpe_number, u32 flags)
 310 {
 311         acpi_status status = AE_OK;
 312         struct acpi_gpe_event_info *gpe_event_info;
 313
 314         ACPI_FUNCTION_TRACE("acpi_disable_gpe");
 315
 316         /* Use semaphore lock if not executing at interrupt level */
 317
 318         if (flags & ACPI_NOT_ISR) {
 319                 status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
 320                 if (ACPI_FAILURE(status)) {
 321                         return_ACPI_STATUS(status);
 322                 }
 323         }
 324
 325         /* Ensure that we have a valid GPE number */
 326
 327         gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
 328         if (!gpe_event_info) {
 329                 status = AE_BAD_PARAMETER;
 330                 goto unlock_and_exit;
 331         }
 332
 333         status = acpi_ev_disable_gpe(gpe_event_info);
 334
 335       unlock_and_exit:
 336         if (flags & ACPI_NOT_ISR) {
 337                 (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
 338         }
 339         return_ACPI_STATUS(status);
 340 }
 341
 342 /*******************************************************************************
 343  *
 344  * FUNCTION:    acpi_disable_event
 345  *
 346  * PARAMETERS:  Event           - The fixed eventto be enabled
 347  *              Flags           - Reserved
 348  *
 349  * RETURN:      Status
 350  *
 351  * DESCRIPTION: Disable an ACPI event (fixed)
 352  *
 353  ******************************************************************************/
 354
 355 acpi_status acpi_disable_event(u32 event, u32 flags)
 356 {
 357         acpi_status status = AE_OK;
 358         u32 value;
 359
 360         ACPI_FUNCTION_TRACE("acpi_disable_event");
 361
 362         /* Decode the Fixed Event */
 363
 364         if (event > ACPI_EVENT_MAX) {
 365                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 366         }
 367
 368         /*
 369          * Disable the requested fixed event (by writing a zero to the
 370          * enable register bit)
 371          */
 372         status =
 373             acpi_set_register(acpi_gbl_fixed_event_info[event].
 374                               enable_register_id, 0, ACPI_MTX_LOCK);
 375         if (ACPI_FAILURE(status)) {
 376                 return_ACPI_STATUS(status);
 377         }
 378
 379         status =
 380             acpi_get_register(acpi_gbl_fixed_event_info[event].
 381                               enable_register_id, &value, ACPI_MTX_LOCK);
 382         if (ACPI_FAILURE(status)) {
 383                 return_ACPI_STATUS(status);
 384         }
 385
 386         if (value != 0) {
 387                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 388                                   "Could not disable %s events\n",
 389                                   acpi_ut_get_event_name(event)));
 390                 return_ACPI_STATUS(AE_NO_HARDWARE_RESPONSE);
 391         }
 392
 393         return_ACPI_STATUS(status);
 394 }
 395
 396 EXPORT_SYMBOL(acpi_disable_event);
 397
 398 /*******************************************************************************
 399  *
 400  * FUNCTION:    acpi_clear_event
 401  *
 402  * PARAMETERS:  Event           - The fixed event to be cleared
 403  *
 404  * RETURN:      Status
 405  *
 406  * DESCRIPTION: Clear an ACPI event (fixed)
 407  *
 408  ******************************************************************************/
 409
 410 acpi_status acpi_clear_event(u32 event)
 411 {
 412         acpi_status status = AE_OK;
 413
 414         ACPI_FUNCTION_TRACE("acpi_clear_event");
 415
 416         /* Decode the Fixed Event */
 417
 418         if (event > ACPI_EVENT_MAX) {
 419                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 420         }
 421
 422         /*
 423          * Clear the requested fixed event (By writing a one to the
 424          * status register bit)
 425          */
 426         status =
 427             acpi_set_register(acpi_gbl_fixed_event_info[event].
 428                               status_register_id, 1, ACPI_MTX_LOCK);
 429
 430         return_ACPI_STATUS(status);
 431 }
 432
 433 EXPORT_SYMBOL(acpi_clear_event);
 434
 435 /*******************************************************************************
 436  *
 437  * FUNCTION:    acpi_clear_gpe
 438  *
 439  * PARAMETERS:  gpe_device      - Parent GPE Device
 440  *              gpe_number      - GPE level within the GPE block
 441  *              Flags           - Called from an ISR or not
 442  *
 443  * RETURN:      Status
 444  *
 445  * DESCRIPTION: Clear an ACPI event (general purpose)
 446  *
 447  ******************************************************************************/
 448
 449 acpi_status acpi_clear_gpe(acpi_handle gpe_device, u32 gpe_number, u32 flags)
 450 {
 451         acpi_status status = AE_OK;
 452         struct acpi_gpe_event_info *gpe_event_info;
 453
 454         ACPI_FUNCTION_TRACE("acpi_clear_gpe");
 455
 456         /* Use semaphore lock if not executing at interrupt level */
 457
 458         if (flags & ACPI_NOT_ISR) {
 459                 status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
 460                 if (ACPI_FAILURE(status)) {
 461                         return_ACPI_STATUS(status);
 462                 }
 463         }
 464
 465         /* Ensure that we have a valid GPE number */
 466
 467         gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
 468         if (!gpe_event_info) {
 469                 status = AE_BAD_PARAMETER;
 470                 goto unlock_and_exit;
 471         }
 472
 473         status = acpi_hw_clear_gpe(gpe_event_info);
 474
 475       unlock_and_exit:
 476         if (flags & ACPI_NOT_ISR) {
 477                 (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
 478         }
 479         return_ACPI_STATUS(status);
 480 }
 481
 482 #ifdef ACPI_FUTURE_USAGE
 483 /*******************************************************************************
 484  *
 485  * FUNCTION:    acpi_get_event_status
 486  *
 487  * PARAMETERS:  Event           - The fixed event
 488  *              event_status    - Where the current status of the event will
 489  *                                be returned
 490  *
 491  * RETURN:      Status
 492  *
 493  * DESCRIPTION: Obtains and returns the current status of the event
 494  *
 495  ******************************************************************************/
 496
 497 acpi_status acpi_get_event_status(u32 event, acpi_event_status * event_status)
 498 {
 499         acpi_status status = AE_OK;
 500
 501         ACPI_FUNCTION_TRACE("acpi_get_event_status");
 502
 503         if (!event_status) {
 504                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 505         }
 506
 507         /* Decode the Fixed Event */
 508
 509         if (event > ACPI_EVENT_MAX) {
 510                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 511         }
 512
 513         /* Get the status of the requested fixed event */
 514
 515         status =
 516             acpi_get_register(acpi_gbl_fixed_event_info[event].
 517                               status_register_id, event_status, ACPI_MTX_LOCK);
 518
 519         return_ACPI_STATUS(status);
 520 }
 521
 522 /*******************************************************************************
 523  *
 524  * FUNCTION:    acpi_get_gpe_status
 525  *
 526  * PARAMETERS:  gpe_device      - Parent GPE Device
 527  *              gpe_number      - GPE level within the GPE block
 528  *              Flags           - Called from an ISR or not
 529  *              event_status    - Where the current status of the event will
 530  *                                be returned
 531  *
 532  * RETURN:      Status
 533  *
 534  * DESCRIPTION: Get status of an event (general purpose)
 535  *
 536  ******************************************************************************/
 537
 538 acpi_status
 539 acpi_get_gpe_status(acpi_handle gpe_device,
 540                     u32 gpe_number, u32 flags, acpi_event_status * event_status)
 541 {
 542         acpi_status status = AE_OK;
 543         struct acpi_gpe_event_info *gpe_event_info;
 544
 545         ACPI_FUNCTION_TRACE("acpi_get_gpe_status");
 546
 547         /* Use semaphore lock if not executing at interrupt level */
 548
 549         if (flags & ACPI_NOT_ISR) {
 550                 status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
 551                 if (ACPI_FAILURE(status)) {
 552                         return_ACPI_STATUS(status);
 553                 }
 554         }
 555
 556         /* Ensure that we have a valid GPE number */
 557
 558         gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
 559         if (!gpe_event_info) {
 560                 status = AE_BAD_PARAMETER;
 561                 goto unlock_and_exit;
 562         }
 563
 564         /* Obtain status on the requested GPE number */
 565
 566         status = acpi_hw_get_gpe_status(gpe_event_info, event_status);
 567
 568       unlock_and_exit:
 569         if (flags & ACPI_NOT_ISR) {
 570                 (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
 571         }
 572         return_ACPI_STATUS(status);
 573 }
 574 #endif                          /*  ACPI_FUTURE_USAGE  */
 575
 576 /*******************************************************************************
 577  *
 578  * FUNCTION:    acpi_install_gpe_block
 579  *
 580  * PARAMETERS:  gpe_device          - Handle to the parent GPE Block Device
 581  *              gpe_block_address   - Address and space_iD
 582  *              register_count      - Number of GPE register pairs in the block
 583  *              interrupt_number    - H/W interrupt for the block
 584  *
 585  * RETURN:      Status
 586  *
 587  * DESCRIPTION: Create and Install a block of GPE registers
 588  *
 589  ******************************************************************************/
 590
 591 acpi_status
 592 acpi_install_gpe_block(acpi_handle gpe_device,
 593                        struct acpi_generic_address *gpe_block_address,
 594                        u32 register_count, u32 interrupt_number)
 595 {
 596         acpi_status status;
 597         union acpi_operand_object *obj_desc;
 598         struct acpi_namespace_node *node;
 599         struct acpi_gpe_block_info *gpe_block;
 600
 601         ACPI_FUNCTION_TRACE("acpi_install_gpe_block");
 602
 603         if ((!gpe_device) || (!gpe_block_address) || (!register_count)) {
 604                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 605         }
 606
 607         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
 608         if (ACPI_FAILURE(status)) {
 609                 return (status);
 610         }
 611
 612         node = acpi_ns_map_handle_to_node(gpe_device);
 613         if (!node) {
 614                 status = AE_BAD_PARAMETER;
 615                 goto unlock_and_exit;
 616         }
 617
 618         /*
 619          * For user-installed GPE Block Devices, the gpe_block_base_number
 620          * is always zero
 621          */
 622         status =
 623             acpi_ev_create_gpe_block(node, gpe_block_address, register_count, 0,
 624                                      interrupt_number, &gpe_block);
 625         if (ACPI_FAILURE(status)) {
 626                 goto unlock_and_exit;
 627         }
 628
 629         /* Get the device_object attached to the node */
 630
 631         obj_desc = acpi_ns_get_attached_object(node);
 632         if (!obj_desc) {
 633                 /* No object, create a new one */
 634
 635                 obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_DEVICE);
 636                 if (!obj_desc) {
 637                         status = AE_NO_MEMORY;
 638                         goto unlock_and_exit;
 639                 }
 640
 641                 status =
 642                     acpi_ns_attach_object(node, obj_desc, ACPI_TYPE_DEVICE);
 643
 644                 /* Remove local reference to the object */
 645
 646                 acpi_ut_remove_reference(obj_desc);
 647
 648                 if (ACPI_FAILURE(status)) {
 649                         goto unlock_and_exit;
 650                 }
 651         }
 652
 653         /* Install the GPE block in the device_object */
 654
 655         obj_desc->device.gpe_block = gpe_block;
 656
 657       unlock_and_exit:
 658         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 659         return_ACPI_STATUS(status);
 660 }
 661
 662 EXPORT_SYMBOL(acpi_install_gpe_block);
 663
 664 /*******************************************************************************
 665  *
 666  * FUNCTION:    acpi_remove_gpe_block
 667  *
 668  * PARAMETERS:  gpe_device          - Handle to the parent GPE Block Device
 669  *
 670  * RETURN:      Status
 671  *
 672  * DESCRIPTION: Remove a previously installed block of GPE registers
 673  *
 674  ******************************************************************************/
 675
 676 acpi_status acpi_remove_gpe_block(acpi_handle gpe_device)
 677 {
 678         union acpi_operand_object *obj_desc;
 679         acpi_status status;
 680         struct acpi_namespace_node *node;
 681
 682         ACPI_FUNCTION_TRACE("acpi_remove_gpe_block");
 683
 684         if (!gpe_device) {
 685                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 686         }
 687
 688         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
 689         if (ACPI_FAILURE(status)) {
 690                 return (status);
 691         }
 692
 693         node = acpi_ns_map_handle_to_node(gpe_device);
 694         if (!node) {
 695                 status = AE_BAD_PARAMETER;
 696                 goto unlock_and_exit;
 697         }
 698
 699         /* Get the device_object attached to the node */
 700
 701         obj_desc = acpi_ns_get_attached_object(node);
 702         if (!obj_desc || !obj_desc->device.gpe_block) {
 703                 return_ACPI_STATUS(AE_NULL_OBJECT);
 704         }
 705
 706         /* Delete the GPE block (but not the device_object) */
 707
 708         status = acpi_ev_delete_gpe_block(obj_desc->device.gpe_block);
 709         if (ACPI_SUCCESS(status)) {
 710                 obj_desc->device.gpe_block = NULL;
 711         }
 712
 713       unlock_and_exit:
 714         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 715         return_ACPI_STATUS(status);
 716 }
 717
 718 EXPORT_SYMBOL(acpi_remove_gpe_block);