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  *
  56  * FUNCTION:    acpi_enable
  57  *
  58  * PARAMETERS:  None
  59  *
  60  * RETURN:      Status
  61  *
  62  * DESCRIPTION: Transfers the system into ACPI mode.
  63  *
  64  ******************************************************************************/
  65
  66 acpi_status
  67 acpi_enable (void)
  68 {
  69         acpi_status                     status = AE_OK;
  70
  71
  72         ACPI_FUNCTION_TRACE ("acpi_enable");
  73
  74
  75         /* Make sure we have the FADT*/
  76
  77         if (!acpi_gbl_FADT) {
  78                 ACPI_DEBUG_PRINT ((ACPI_DB_WARN, "No FADT information present!\n"));
  79                 return_ACPI_STATUS (AE_NO_ACPI_TABLES);
  80         }
  81
  82         if (acpi_hw_get_mode() == ACPI_SYS_MODE_ACPI) {
  83                 ACPI_DEBUG_PRINT ((ACPI_DB_INIT, "System is already in ACPI mode\n"));
  84         }
  85         else {
  86                 /* Transition to ACPI mode */
  87
  88                 status = acpi_hw_set_mode (ACPI_SYS_MODE_ACPI);
  89                 if (ACPI_FAILURE (status)) {
  90                         ACPI_REPORT_ERROR (("Could not transition to ACPI mode.\n"));
  91                         return_ACPI_STATUS (status);
  92                 }
  93
  94                 ACPI_DEBUG_PRINT ((ACPI_DB_INIT, "Transition to ACPI mode successful\n"));
  95         }
  96
  97         return_ACPI_STATUS (status);
  98 }
  99
 100
 101 /*******************************************************************************
 102  *
 103  * FUNCTION:    acpi_disable
 104  *
 105  * PARAMETERS:  None
 106  *
 107  * RETURN:      Status
 108  *
 109  * DESCRIPTION: Transfers the system into LEGACY mode.
 110  *
 111  ******************************************************************************/
 112
 113 acpi_status
 114 acpi_disable (void)
 115 {
 116         acpi_status                     status = AE_OK;
 117
 118
 119         ACPI_FUNCTION_TRACE ("acpi_disable");
 120
 121
 122         if (!acpi_gbl_FADT) {
 123                 ACPI_DEBUG_PRINT ((ACPI_DB_WARN, "No FADT information present!\n"));
 124                 return_ACPI_STATUS (AE_NO_ACPI_TABLES);
 125         }
 126
 127         if (acpi_hw_get_mode() == ACPI_SYS_MODE_LEGACY) {
 128                 ACPI_DEBUG_PRINT ((ACPI_DB_INIT, "System is already in legacy (non-ACPI) mode\n"));
 129         }
 130         else {
 131                 /* Transition to LEGACY mode */
 132
 133                 status = acpi_hw_set_mode (ACPI_SYS_MODE_LEGACY);
 134
 135                 if (ACPI_FAILURE (status)) {
 136                         ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Could not exit ACPI mode to legacy mode"));
 137                         return_ACPI_STATUS (status);
 138                 }
 139
 140                 ACPI_DEBUG_PRINT ((ACPI_DB_INIT, "ACPI mode disabled\n"));
 141         }
 142
 143         return_ACPI_STATUS (status);
 144 }
 145
 146
 147 /*******************************************************************************
 148  *
 149  * FUNCTION:    acpi_enable_event
 150  *
 151  * PARAMETERS:  Event           - The fixed eventto be enabled
 152  *              Flags           - Reserved
 153  *
 154  * RETURN:      Status
 155  *
 156  * DESCRIPTION: Enable an ACPI event (fixed)
 157  *
 158  ******************************************************************************/
 159
 160 acpi_status
 161 acpi_enable_event (
 162         u32                             event,
 163         u32                             flags)
 164 {
 165         acpi_status                     status = AE_OK;
 166         u32                             value;
 167
 168
 169         ACPI_FUNCTION_TRACE ("acpi_enable_event");
 170
 171
 172         /* Decode the Fixed Event */
 173
 174         if (event > ACPI_EVENT_MAX) {
 175                 return_ACPI_STATUS (AE_BAD_PARAMETER);
 176         }
 177
 178         /*
 179          * Enable the requested fixed event (by writing a one to the
 180          * enable register bit)
 181          */
 182         status = acpi_set_register (acpi_gbl_fixed_event_info[event].enable_register_id,
 183                          1, ACPI_MTX_LOCK);
 184         if (ACPI_FAILURE (status)) {
 185                 return_ACPI_STATUS (status);
 186         }
 187
 188         /* Make sure that the hardware responded */
 189
 190         status = acpi_get_register (acpi_gbl_fixed_event_info[event].enable_register_id,
 191                           &value, ACPI_MTX_LOCK);
 192         if (ACPI_FAILURE (status)) {
 193                 return_ACPI_STATUS (status);
 194         }
 195
 196         if (value != 1) {
 197                 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
 198                         "Could not enable %s event\n", acpi_ut_get_event_name (event)));
 199                 return_ACPI_STATUS (AE_NO_HARDWARE_RESPONSE);
 200         }
 201
 202         return_ACPI_STATUS (status);
 203 }
 204 EXPORT_SYMBOL(acpi_enable_event);
 205
 206
 207 /*******************************************************************************
 208  *
 209  * FUNCTION:    acpi_set_gpe_type
 210  *
 211  * PARAMETERS:  gpe_device      - Parent GPE Device
 212  *              gpe_number      - GPE level within the GPE block
 213  *              Type            - New GPE type
 214  *
 215  * RETURN:      Status
 216  *
 217  * DESCRIPTION: Enable an ACPI event (general purpose)
 218  *
 219  ******************************************************************************/
 220
 221 acpi_status
 222 acpi_set_gpe_type (
 223         acpi_handle                     gpe_device,
 224         u32                             gpe_number,
 225         u8                              type)
 226 {
 227         acpi_status                     status = AE_OK;
 228         struct acpi_gpe_event_info      *gpe_event_info;
 229
 230
 231         ACPI_FUNCTION_TRACE ("acpi_set_gpe_type");
 232
 233
 234         /* Ensure that we have a valid GPE number */
 235
 236         gpe_event_info = acpi_ev_get_gpe_event_info (gpe_device, gpe_number);
 237         if (!gpe_event_info) {
 238                 status = AE_BAD_PARAMETER;
 239                 goto unlock_and_exit;
 240         }
 241
 242         if ((gpe_event_info->flags & ACPI_GPE_TYPE_MASK) == type) {
 243                 return_ACPI_STATUS (AE_OK);
 244         }
 245
 246         /* Set the new type (will disable GPE if currently enabled) */
 247
 248         status = acpi_ev_set_gpe_type (gpe_event_info, type);
 249
 250 unlock_and_exit:
 251         return_ACPI_STATUS (status);
 252 }
 253 EXPORT_SYMBOL(acpi_set_gpe_type);
 254
 255
 256 /*******************************************************************************
 257  *
 258  * FUNCTION:    acpi_enable_gpe
 259  *
 260  * PARAMETERS:  gpe_device      - Parent GPE Device
 261  *              gpe_number      - GPE level within the GPE block
 262  *              Flags           - Just enable, or also wake enable?
 263  *                                Called from ISR or not
 264  *
 265  * RETURN:      Status
 266  *
 267  * DESCRIPTION: Enable an ACPI event (general purpose)
 268  *
 269  ******************************************************************************/
 270
 271 acpi_status
 272 acpi_enable_gpe (
 273         acpi_handle                     gpe_device,
 274         u32                             gpe_number,
 275         u32                             flags)
 276 {
 277         acpi_status                     status = AE_OK;
 278         struct acpi_gpe_event_info      *gpe_event_info;
 279
 280
 281         ACPI_FUNCTION_TRACE ("acpi_enable_gpe");
 282
 283
 284         /* Use semaphore lock if not executing at interrupt level */
 285
 286         if (flags & ACPI_NOT_ISR) {
 287                 status = acpi_ut_acquire_mutex (ACPI_MTX_EVENTS);
 288                 if (ACPI_FAILURE (status)) {
 289                         return_ACPI_STATUS (status);
 290                 }
 291         }
 292
 293         /* Ensure that we have a valid GPE number */
 294
 295         gpe_event_info = acpi_ev_get_gpe_event_info (gpe_device, gpe_number);
 296         if (!gpe_event_info) {
 297                 status = AE_BAD_PARAMETER;
 298                 goto unlock_and_exit;
 299         }
 300
 301         /* Perform the enable */
 302
 303         status = acpi_ev_enable_gpe (gpe_event_info, TRUE);
 304
 305 unlock_and_exit:
 306         if (flags & ACPI_NOT_ISR) {
 307                 (void) acpi_ut_release_mutex (ACPI_MTX_EVENTS);
 308         }
 309         return_ACPI_STATUS (status);
 310 }
 311 EXPORT_SYMBOL(acpi_enable_gpe);
 312
 313
 314 /*******************************************************************************
 315  *
 316  * FUNCTION:    acpi_disable_gpe
 317  *
 318  * PARAMETERS:  gpe_device      - Parent GPE Device
 319  *              gpe_number      - GPE level within the GPE block
 320  *              Flags           - Just disable, or also wake disable?
 321  *                                Called from ISR or not
 322  *
 323  * RETURN:      Status
 324  *
 325  * DESCRIPTION: Disable an ACPI event (general purpose)
 326  *
 327  ******************************************************************************/
 328
 329 acpi_status
 330 acpi_disable_gpe (
 331         acpi_handle                     gpe_device,
 332         u32                             gpe_number,
 333         u32                             flags)
 334 {
 335         acpi_status                     status = AE_OK;
 336         struct acpi_gpe_event_info      *gpe_event_info;
 337
 338
 339         ACPI_FUNCTION_TRACE ("acpi_disable_gpe");
 340
 341
 342         /* Use semaphore lock if not executing at interrupt level */
 343
 344         if (flags & ACPI_NOT_ISR) {
 345                 status = acpi_ut_acquire_mutex (ACPI_MTX_EVENTS);
 346                 if (ACPI_FAILURE (status)) {
 347                         return_ACPI_STATUS (status);
 348                 }
 349         }
 350
 351         /* Ensure that we have a valid GPE number */
 352
 353         gpe_event_info = acpi_ev_get_gpe_event_info (gpe_device, gpe_number);
 354         if (!gpe_event_info) {
 355                 status = AE_BAD_PARAMETER;
 356                 goto unlock_and_exit;
 357         }
 358
 359         status = acpi_ev_disable_gpe (gpe_event_info);
 360
 361 unlock_and_exit:
 362         if (flags & ACPI_NOT_ISR) {
 363                 (void) acpi_ut_release_mutex (ACPI_MTX_EVENTS);
 364         }
 365         return_ACPI_STATUS (status);
 366 }
 367
 368
 369 /*******************************************************************************
 370  *
 371  * FUNCTION:    acpi_disable_event
 372  *
 373  * PARAMETERS:  Event           - The fixed eventto be enabled
 374  *              Flags           - Reserved
 375  *
 376  * RETURN:      Status
 377  *
 378  * DESCRIPTION: Disable an ACPI event (fixed)
 379  *
 380  ******************************************************************************/
 381
 382 acpi_status
 383 acpi_disable_event (
 384         u32                             event,
 385         u32                             flags)
 386 {
 387         acpi_status                     status = AE_OK;
 388         u32                             value;
 389
 390
 391         ACPI_FUNCTION_TRACE ("acpi_disable_event");
 392
 393
 394         /* Decode the Fixed Event */
 395
 396         if (event > ACPI_EVENT_MAX) {
 397                 return_ACPI_STATUS (AE_BAD_PARAMETER);
 398         }
 399
 400         /*
 401          * Disable the requested fixed event (by writing a zero to the
 402          * enable register bit)
 403          */
 404         status = acpi_set_register (acpi_gbl_fixed_event_info[event].enable_register_id,
 405                          0, ACPI_MTX_LOCK);
 406         if (ACPI_FAILURE (status)) {
 407                 return_ACPI_STATUS (status);
 408         }
 409
 410         status = acpi_get_register (acpi_gbl_fixed_event_info[event].enable_register_id,
 411                          &value, ACPI_MTX_LOCK);
 412         if (ACPI_FAILURE (status)) {
 413                 return_ACPI_STATUS (status);
 414         }
 415
 416         if (value != 0) {
 417                 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
 418                         "Could not disable %s events\n", acpi_ut_get_event_name (event)));
 419                 return_ACPI_STATUS (AE_NO_HARDWARE_RESPONSE);
 420         }
 421
 422         return_ACPI_STATUS (status);
 423 }
 424 EXPORT_SYMBOL(acpi_disable_event);
 425
 426
 427 /*******************************************************************************
 428  *
 429  * FUNCTION:    acpi_clear_event
 430  *
 431  * PARAMETERS:  Event           - The fixed event to be cleared
 432  *
 433  * RETURN:      Status
 434  *
 435  * DESCRIPTION: Clear an ACPI event (fixed)
 436  *
 437  ******************************************************************************/
 438
 439 acpi_status
 440 acpi_clear_event (
 441         u32                             event)
 442 {
 443         acpi_status                     status = AE_OK;
 444
 445
 446         ACPI_FUNCTION_TRACE ("acpi_clear_event");
 447
 448
 449         /* Decode the Fixed Event */
 450
 451         if (event > ACPI_EVENT_MAX) {
 452                 return_ACPI_STATUS (AE_BAD_PARAMETER);
 453         }
 454
 455         /*
 456          * Clear the requested fixed event (By writing a one to the
 457          * status register bit)
 458          */
 459         status = acpi_set_register (acpi_gbl_fixed_event_info[event].status_register_id,
 460                         1, ACPI_MTX_LOCK);
 461
 462         return_ACPI_STATUS (status);
 463 }
 464 EXPORT_SYMBOL(acpi_clear_event);
 465
 466
 467 /*******************************************************************************
 468  *
 469  * FUNCTION:    acpi_clear_gpe
 470  *
 471  * PARAMETERS:  gpe_device      - Parent GPE Device
 472  *              gpe_number      - GPE level within the GPE block
 473  *              Flags           - Called from an ISR or not
 474  *
 475  * RETURN:      Status
 476  *
 477  * DESCRIPTION: Clear an ACPI event (general purpose)
 478  *
 479  ******************************************************************************/
 480
 481 acpi_status
 482 acpi_clear_gpe (
 483         acpi_handle                     gpe_device,
 484         u32                             gpe_number,
 485         u32                             flags)
 486 {
 487         acpi_status                     status = AE_OK;
 488         struct acpi_gpe_event_info      *gpe_event_info;
 489
 490
 491         ACPI_FUNCTION_TRACE ("acpi_clear_gpe");
 492
 493
 494         /* Use semaphore lock if not executing at interrupt level */
 495
 496         if (flags & ACPI_NOT_ISR) {
 497                 status = acpi_ut_acquire_mutex (ACPI_MTX_EVENTS);
 498                 if (ACPI_FAILURE (status)) {
 499                         return_ACPI_STATUS (status);
 500                 }
 501         }
 502
 503         /* Ensure that we have a valid GPE number */
 504
 505         gpe_event_info = acpi_ev_get_gpe_event_info (gpe_device, gpe_number);
 506         if (!gpe_event_info) {
 507                 status = AE_BAD_PARAMETER;
 508                 goto unlock_and_exit;
 509         }
 510
 511         status = acpi_hw_clear_gpe (gpe_event_info);
 512
 513 unlock_and_exit:
 514         if (flags & ACPI_NOT_ISR) {
 515                 (void) acpi_ut_release_mutex (ACPI_MTX_EVENTS);
 516         }
 517         return_ACPI_STATUS (status);
 518 }
 519
 520
 521 #ifdef ACPI_FUTURE_USAGE
 522
 523 /*******************************************************************************
 524  *
 525  * FUNCTION:    acpi_get_event_status
 526  *
 527  * PARAMETERS:  Event           - The fixed event
 528  *              Event Status    - Where the current status of the event will
 529  *                                be returned
 530  *
 531  * RETURN:      Status
 532  *
 533  * DESCRIPTION: Obtains and returns the current status of the event
 534  *
 535  ******************************************************************************/
 536
 537 acpi_status
 538 acpi_get_event_status (
 539         u32                             event,
 540         acpi_event_status               *event_status)
 541 {
 542         acpi_status                     status = AE_OK;
 543
 544
 545         ACPI_FUNCTION_TRACE ("acpi_get_event_status");
 546
 547
 548         if (!event_status) {
 549                 return_ACPI_STATUS (AE_BAD_PARAMETER);
 550         }
 551
 552         /* Decode the Fixed Event */
 553
 554         if (event > ACPI_EVENT_MAX) {
 555                 return_ACPI_STATUS (AE_BAD_PARAMETER);
 556         }
 557
 558         /* Get the status of the requested fixed event */
 559
 560         status = acpi_get_register (acpi_gbl_fixed_event_info[event].status_register_id,
 561                           event_status, ACPI_MTX_LOCK);
 562
 563         return_ACPI_STATUS (status);
 564 }
 565
 566
 567 /*******************************************************************************
 568  *
 569  * FUNCTION:    acpi_get_gpe_status
 570  *
 571  * PARAMETERS:  gpe_device      - Parent GPE Device
 572  *              gpe_number      - GPE level within the GPE block
 573  *              Flags           - Called from an ISR or not
 574  *              Event Status    - Where the current status of the event will
 575  *                                be returned
 576  *
 577  * RETURN:      Status
 578  *
 579  * DESCRIPTION: Get status of an event (general purpose)
 580  *
 581  ******************************************************************************/
 582
 583 acpi_status
 584 acpi_get_gpe_status (
 585         acpi_handle                     gpe_device,
 586         u32                             gpe_number,
 587         u32                             flags,
 588         acpi_event_status               *event_status)
 589 {
 590         acpi_status                     status = AE_OK;
 591         struct acpi_gpe_event_info      *gpe_event_info;
 592
 593
 594         ACPI_FUNCTION_TRACE ("acpi_get_gpe_status");
 595
 596
 597         /* Use semaphore lock if not executing at interrupt level */
 598
 599         if (flags & ACPI_NOT_ISR) {
 600                 status = acpi_ut_acquire_mutex (ACPI_MTX_EVENTS);
 601                 if (ACPI_FAILURE (status)) {
 602                         return_ACPI_STATUS (status);
 603                 }
 604         }
 605
 606         /* Ensure that we have a valid GPE number */
 607
 608         gpe_event_info = acpi_ev_get_gpe_event_info (gpe_device, gpe_number);
 609         if (!gpe_event_info) {
 610                 status = AE_BAD_PARAMETER;
 611                 goto unlock_and_exit;
 612         }
 613
 614         /* Obtain status on the requested GPE number */
 615
 616         status = acpi_hw_get_gpe_status (gpe_event_info, event_status);
 617
 618 unlock_and_exit:
 619         if (flags & ACPI_NOT_ISR) {
 620                 (void) acpi_ut_release_mutex (ACPI_MTX_EVENTS);
 621         }
 622         return_ACPI_STATUS (status);
 623 }
 624 #endif  /*  ACPI_FUTURE_USAGE  */
 625
 626
 627 /*******************************************************************************
 628  *
 629  * FUNCTION:    acpi_install_gpe_block
 630  *
 631  * PARAMETERS:  gpe_device          - Handle to the parent GPE Block Device
 632  *              gpe_block_address   - Address and space_iD
 633  *              register_count      - Number of GPE register pairs in the block
 634  *              interrupt_level     - H/W interrupt for the block
 635  *
 636  * RETURN:      Status
 637  *
 638  * DESCRIPTION: Create and Install a block of GPE registers
 639  *
 640  ******************************************************************************/
 641
 642 acpi_status
 643 acpi_install_gpe_block (
 644         acpi_handle                     gpe_device,
 645         struct acpi_generic_address     *gpe_block_address,
 646         u32                             register_count,
 647         u32                             interrupt_level)
 648 {
 649         acpi_status                     status;
 650         union acpi_operand_object       *obj_desc;
 651         struct acpi_namespace_node      *node;
 652         struct acpi_gpe_block_info      *gpe_block;
 653
 654
 655         ACPI_FUNCTION_TRACE ("acpi_install_gpe_block");
 656
 657
 658         if ((!gpe_device)      ||
 659                 (!gpe_block_address) ||
 660                 (!register_count)) {
 661                 return_ACPI_STATUS (AE_BAD_PARAMETER);
 662         }
 663
 664         status = acpi_ut_acquire_mutex (ACPI_MTX_NAMESPACE);
 665         if (ACPI_FAILURE (status)) {
 666                 return (status);
 667         }
 668
 669         node = acpi_ns_map_handle_to_node (gpe_device);
 670         if (!node) {
 671                 status = AE_BAD_PARAMETER;
 672                 goto unlock_and_exit;
 673         }
 674
 675         /*
 676          * For user-installed GPE Block Devices, the gpe_block_base_number
 677          * is always zero
 678          */
 679         status = acpi_ev_create_gpe_block (node, gpe_block_address, register_count,
 680                           0, interrupt_level, &gpe_block);
 681         if (ACPI_FAILURE (status)) {
 682                 goto unlock_and_exit;
 683         }
 684
 685         /* Get the device_object attached to the node */
 686
 687         obj_desc = acpi_ns_get_attached_object (node);
 688         if (!obj_desc) {
 689                 /* No object, create a new one */
 690
 691                 obj_desc = acpi_ut_create_internal_object (ACPI_TYPE_DEVICE);
 692                 if (!obj_desc) {
 693                         status = AE_NO_MEMORY;
 694                         goto unlock_and_exit;
 695                 }
 696
 697                 status = acpi_ns_attach_object (node, obj_desc, ACPI_TYPE_DEVICE);
 698
 699                 /* Remove local reference to the object */
 700
 701                 acpi_ut_remove_reference (obj_desc);
 702
 703                 if (ACPI_FAILURE (status)) {
 704                         goto unlock_and_exit;
 705                 }
 706         }
 707
 708         /* Install the GPE block in the device_object */
 709
 710         obj_desc->device.gpe_block = gpe_block;
 711
 712
 713 unlock_and_exit:
 714         (void) acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);
 715         return_ACPI_STATUS (status);
 716 }
 717 EXPORT_SYMBOL(acpi_install_gpe_block);
 718
 719
 720 /*******************************************************************************
 721  *
 722  * FUNCTION:    acpi_remove_gpe_block
 723  *
 724  * PARAMETERS:  gpe_device          - Handle to the parent GPE Block Device
 725  *
 726  * RETURN:      Status
 727  *
 728  * DESCRIPTION: Remove a previously installed block of GPE registers
 729  *
 730  ******************************************************************************/
 731
 732 acpi_status
 733 acpi_remove_gpe_block (
 734         acpi_handle                     gpe_device)
 735 {
 736         union acpi_operand_object       *obj_desc;
 737         acpi_status                     status;
 738         struct acpi_namespace_node      *node;
 739
 740
 741         ACPI_FUNCTION_TRACE ("acpi_remove_gpe_block");
 742
 743
 744         if (!gpe_device) {
 745                 return_ACPI_STATUS (AE_BAD_PARAMETER);
 746         }
 747
 748         status = acpi_ut_acquire_mutex (ACPI_MTX_NAMESPACE);
 749         if (ACPI_FAILURE (status)) {
 750                 return (status);
 751         }
 752
 753         node = acpi_ns_map_handle_to_node (gpe_device);
 754         if (!node) {
 755                 status = AE_BAD_PARAMETER;
 756                 goto unlock_and_exit;
 757         }
 758
 759         /* Get the device_object attached to the node */
 760
 761         obj_desc = acpi_ns_get_attached_object (node);
 762         if (!obj_desc ||
 763                 !obj_desc->device.gpe_block) {
 764                 return_ACPI_STATUS (AE_NULL_OBJECT);
 765         }
 766
 767         /* Delete the GPE block (but not the device_object) */
 768
 769         status = acpi_ev_delete_gpe_block (obj_desc->device.gpe_block);
 770         if (ACPI_SUCCESS (status)) {
 771                 obj_desc->device.gpe_block = NULL;
 772         }
 773
 774 unlock_and_exit:
 775         (void) acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);
 776         return_ACPI_STATUS (status);
 777 }
 778 EXPORT_SYMBOL(acpi_remove_gpe_block);