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_type
 205  *
 206  * PARAMETERS:  gpe_device      - Parent GPE Device
 207  *              gpe_number      - GPE level within the GPE block
 208  *              Type            - New GPE type
 209  *
 210  * RETURN:      Status
 211  *
 212  * DESCRIPTION: Set the type of an individual GPE
 213  *
 214  ******************************************************************************/
 215 acpi_status acpi_set_gpe_type(acpi_handle gpe_device, u32 gpe_number, u8 type)
 216 {
 217         acpi_status status = AE_OK;
 218         struct acpi_gpe_event_info *gpe_event_info;
 219
 220         ACPI_FUNCTION_TRACE(acpi_set_gpe_type);
 221
 222         /* Ensure that we have a valid GPE number */
 223
 224         gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
 225         if (!gpe_event_info) {
 226                 status = AE_BAD_PARAMETER;
 227                 goto unlock_and_exit;
 228         }
 229
 230         if ((gpe_event_info->flags & ACPI_GPE_TYPE_MASK) == type) {
 231                 return_ACPI_STATUS(AE_OK);
 232         }
 233
 234         /* Set the new type (will disable GPE if currently enabled) */
 235
 236         status = acpi_ev_set_gpe_type(gpe_event_info, type);
 237
 238       unlock_and_exit:
 239         return_ACPI_STATUS(status);
 240 }
 241
 242 ACPI_EXPORT_SYMBOL(acpi_set_gpe_type)
 243
 244 /*******************************************************************************
 245  *
 246  * FUNCTION:    acpi_enable_gpe
 247  *
 248  * PARAMETERS:  gpe_device      - Parent GPE Device
 249  *              gpe_number      - GPE level within the GPE block
 250  *              Flags           - Just enable, or also wake enable?
 251  *                                Called from ISR or not
 252  *
 253  * RETURN:      Status
 254  *
 255  * DESCRIPTION: Enable an ACPI event (general purpose)
 256  *
 257  ******************************************************************************/
 258 acpi_status acpi_enable_gpe(acpi_handle gpe_device, u32 gpe_number)
 259 {
 260         acpi_status status = AE_OK;
 261         acpi_cpu_flags flags;
 262         struct acpi_gpe_event_info *gpe_event_info;
 263
 264         ACPI_FUNCTION_TRACE(acpi_enable_gpe);
 265
 266         flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
 267
 268         /* Ensure that we have a valid GPE number */
 269
 270         gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
 271         if (!gpe_event_info) {
 272                 status = AE_BAD_PARAMETER;
 273                 goto unlock_and_exit;
 274         }
 275
 276         /* Perform the enable */
 277
 278         status = acpi_ev_enable_gpe(gpe_event_info, TRUE);
 279
 280       unlock_and_exit:
 281         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 282         return_ACPI_STATUS(status);
 283 }
 284
 285 ACPI_EXPORT_SYMBOL(acpi_enable_gpe)
 286
 287 /*******************************************************************************
 288  *
 289  * FUNCTION:    acpi_disable_gpe
 290  *
 291  * PARAMETERS:  gpe_device      - Parent GPE Device
 292  *              gpe_number      - GPE level within the GPE block
 293  *              Flags           - Just disable, or also wake disable?
 294  *                                Called from ISR or not
 295  *
 296  * RETURN:      Status
 297  *
 298  * DESCRIPTION: Disable an ACPI event (general purpose)
 299  *
 300  ******************************************************************************/
 301 acpi_status acpi_disable_gpe(acpi_handle gpe_device, u32 gpe_number)
 302 {
 303         acpi_status status = AE_OK;
 304         acpi_cpu_flags flags;
 305         struct acpi_gpe_event_info *gpe_event_info;
 306
 307         ACPI_FUNCTION_TRACE(acpi_disable_gpe);
 308
 309         flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
 310         /* Ensure that we have a valid GPE number */
 311
 312         gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
 313         if (!gpe_event_info) {
 314                 status = AE_BAD_PARAMETER;
 315                 goto unlock_and_exit;
 316         }
 317
 318         status = acpi_ev_disable_gpe(gpe_event_info);
 319
 320 unlock_and_exit:
 321         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 322         return_ACPI_STATUS(status);
 323 }
 324
 325 ACPI_EXPORT_SYMBOL(acpi_disable_gpe)
 326
 327 /*******************************************************************************
 328  *
 329  * FUNCTION:    acpi_disable_event
 330  *
 331  * PARAMETERS:  Event           - The fixed eventto be enabled
 332  *              Flags           - Reserved
 333  *
 334  * RETURN:      Status
 335  *
 336  * DESCRIPTION: Disable an ACPI event (fixed)
 337  *
 338  ******************************************************************************/
 339 acpi_status acpi_disable_event(u32 event, u32 flags)
 340 {
 341         acpi_status status = AE_OK;
 342         u32 value;
 343
 344         ACPI_FUNCTION_TRACE(acpi_disable_event);
 345
 346         /* Decode the Fixed Event */
 347
 348         if (event > ACPI_EVENT_MAX) {
 349                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 350         }
 351
 352         /*
 353          * Disable the requested fixed event (by writing a zero to the enable
 354          * register bit)
 355          */
 356         status =
 357             acpi_write_bit_register(acpi_gbl_fixed_event_info[event].
 358                                     enable_register_id, ACPI_DISABLE_EVENT);
 359         if (ACPI_FAILURE(status)) {
 360                 return_ACPI_STATUS(status);
 361         }
 362
 363         status =
 364             acpi_read_bit_register(acpi_gbl_fixed_event_info[event].
 365                                    enable_register_id, &value);
 366         if (ACPI_FAILURE(status)) {
 367                 return_ACPI_STATUS(status);
 368         }
 369
 370         if (value != 0) {
 371                 ACPI_ERROR((AE_INFO,
 372                             "Could not disable %s events",
 373                             acpi_ut_get_event_name(event)));
 374                 return_ACPI_STATUS(AE_NO_HARDWARE_RESPONSE);
 375         }
 376
 377         return_ACPI_STATUS(status);
 378 }
 379
 380 ACPI_EXPORT_SYMBOL(acpi_disable_event)
 381
 382 /*******************************************************************************
 383  *
 384  * FUNCTION:    acpi_clear_event
 385  *
 386  * PARAMETERS:  Event           - The fixed event to be cleared
 387  *
 388  * RETURN:      Status
 389  *
 390  * DESCRIPTION: Clear an ACPI event (fixed)
 391  *
 392  ******************************************************************************/
 393 acpi_status acpi_clear_event(u32 event)
 394 {
 395         acpi_status status = AE_OK;
 396
 397         ACPI_FUNCTION_TRACE(acpi_clear_event);
 398
 399         /* Decode the Fixed Event */
 400
 401         if (event > ACPI_EVENT_MAX) {
 402                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 403         }
 404
 405         /*
 406          * Clear the requested fixed event (By writing a one to the status
 407          * register bit)
 408          */
 409         status =
 410             acpi_write_bit_register(acpi_gbl_fixed_event_info[event].
 411                                     status_register_id, ACPI_CLEAR_STATUS);
 412
 413         return_ACPI_STATUS(status);
 414 }
 415
 416 ACPI_EXPORT_SYMBOL(acpi_clear_event)
 417
 418 /*******************************************************************************
 419  *
 420  * FUNCTION:    acpi_clear_gpe
 421  *
 422  * PARAMETERS:  gpe_device      - Parent GPE Device
 423  *              gpe_number      - GPE level within the GPE block
 424  *              Flags           - Called from an ISR or not
 425  *
 426  * RETURN:      Status
 427  *
 428  * DESCRIPTION: Clear an ACPI event (general purpose)
 429  *
 430  ******************************************************************************/
 431 acpi_status acpi_clear_gpe(acpi_handle gpe_device, u32 gpe_number, u32 flags)
 432 {
 433         acpi_status status = AE_OK;
 434         struct acpi_gpe_event_info *gpe_event_info;
 435
 436         ACPI_FUNCTION_TRACE(acpi_clear_gpe);
 437
 438         /* Use semaphore lock if not executing at interrupt level */
 439
 440         if (flags & ACPI_NOT_ISR) {
 441                 status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
 442                 if (ACPI_FAILURE(status)) {
 443                         return_ACPI_STATUS(status);
 444                 }
 445         }
 446
 447         /* Ensure that we have a valid GPE number */
 448
 449         gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
 450         if (!gpe_event_info) {
 451                 status = AE_BAD_PARAMETER;
 452                 goto unlock_and_exit;
 453         }
 454
 455         status = acpi_hw_clear_gpe(gpe_event_info);
 456
 457       unlock_and_exit:
 458         if (flags & ACPI_NOT_ISR) {
 459                 (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
 460         }
 461         return_ACPI_STATUS(status);
 462 }
 463
 464 ACPI_EXPORT_SYMBOL(acpi_clear_gpe)
 465 /*******************************************************************************
 466  *
 467  * FUNCTION:    acpi_get_event_status
 468  *
 469  * PARAMETERS:  Event           - The fixed event
 470  *              event_status    - Where the current status of the event will
 471  *                                be returned
 472  *
 473  * RETURN:      Status
 474  *
 475  * DESCRIPTION: Obtains and returns the current status of the event
 476  *
 477  ******************************************************************************/
 478 acpi_status acpi_get_event_status(u32 event, acpi_event_status * event_status)
 479 {
 480         acpi_status status = AE_OK;
 481         u32 value;
 482
 483         ACPI_FUNCTION_TRACE(acpi_get_event_status);
 484
 485         if (!event_status) {
 486                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 487         }
 488
 489         /* Decode the Fixed Event */
 490
 491         if (event > ACPI_EVENT_MAX) {
 492                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 493         }
 494
 495         /* Get the status of the requested fixed event */
 496
 497         status =
 498             acpi_read_bit_register(acpi_gbl_fixed_event_info[event].
 499                               enable_register_id, &value);
 500         if (ACPI_FAILURE(status))
 501                 return_ACPI_STATUS(status);
 502
 503         *event_status = value;
 504
 505         status =
 506             acpi_read_bit_register(acpi_gbl_fixed_event_info[event].
 507                               status_register_id, &value);
 508         if (ACPI_FAILURE(status))
 509                 return_ACPI_STATUS(status);
 510
 511         if (value)
 512                 *event_status |= ACPI_EVENT_FLAG_SET;
 513
 514         if (acpi_gbl_fixed_event_handlers[event].handler)
 515                 *event_status |= ACPI_EVENT_FLAG_HANDLE;
 516
 517         return_ACPI_STATUS(status);
 518 }
 519
 520 ACPI_EXPORT_SYMBOL(acpi_get_event_status)
 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 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         if (gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK)
 568                 *event_status |= ACPI_EVENT_FLAG_HANDLE;
 569
 570       unlock_and_exit:
 571         if (flags & ACPI_NOT_ISR) {
 572                 (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
 573         }
 574         return_ACPI_STATUS(status);
 575 }
 576
 577 ACPI_EXPORT_SYMBOL(acpi_get_gpe_status)
 578 /*******************************************************************************
 579  *
 580  * FUNCTION:    acpi_install_gpe_block
 581  *
 582  * PARAMETERS:  gpe_device          - Handle to the parent GPE Block Device
 583  *              gpe_block_address   - Address and space_iD
 584  *              register_count      - Number of GPE register pairs in the block
 585  *              interrupt_number    - H/W interrupt for the block
 586  *
 587  * RETURN:      Status
 588  *
 589  * DESCRIPTION: Create and Install a block of GPE registers
 590  *
 591  ******************************************************************************/
 592 acpi_status
 593 acpi_install_gpe_block(acpi_handle gpe_device,
 594                        struct acpi_generic_address *gpe_block_address,
 595                        u32 register_count, u32 interrupt_number)
 596 {
 597         acpi_status status;
 598         union acpi_operand_object *obj_desc;
 599         struct acpi_namespace_node *node;
 600         struct acpi_gpe_block_info *gpe_block;
 601
 602         ACPI_FUNCTION_TRACE(acpi_install_gpe_block);
 603
 604         if ((!gpe_device) || (!gpe_block_address) || (!register_count)) {
 605                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 606         }
 607
 608         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
 609         if (ACPI_FAILURE(status)) {
 610                 return (status);
 611         }
 612
 613         node = acpi_ns_map_handle_to_node(gpe_device);
 614         if (!node) {
 615                 status = AE_BAD_PARAMETER;
 616                 goto unlock_and_exit;
 617         }
 618
 619         /*
 620          * For user-installed GPE Block Devices, the gpe_block_base_number
 621          * is always zero
 622          */
 623         status =
 624             acpi_ev_create_gpe_block(node, gpe_block_address, register_count, 0,
 625                                      interrupt_number, &gpe_block);
 626         if (ACPI_FAILURE(status)) {
 627                 goto unlock_and_exit;
 628         }
 629
 630         /* Run the _PRW methods and enable the GPEs */
 631
 632         status = acpi_ev_initialize_gpe_block(node, gpe_block);
 633         if (ACPI_FAILURE(status)) {
 634                 goto unlock_and_exit;
 635         }
 636
 637         /* Get the device_object attached to the node */
 638
 639         obj_desc = acpi_ns_get_attached_object(node);
 640         if (!obj_desc) {
 641
 642                 /* No object, create a new one */
 643
 644                 obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_DEVICE);
 645                 if (!obj_desc) {
 646                         status = AE_NO_MEMORY;
 647                         goto unlock_and_exit;
 648                 }
 649
 650                 status =
 651                     acpi_ns_attach_object(node, obj_desc, ACPI_TYPE_DEVICE);
 652
 653                 /* Remove local reference to the object */
 654
 655                 acpi_ut_remove_reference(obj_desc);
 656
 657                 if (ACPI_FAILURE(status)) {
 658                         goto unlock_and_exit;
 659                 }
 660         }
 661
 662         /* Install the GPE block in the device_object */
 663
 664         obj_desc->device.gpe_block = gpe_block;
 665
 666       unlock_and_exit:
 667         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 668         return_ACPI_STATUS(status);
 669 }
 670
 671 ACPI_EXPORT_SYMBOL(acpi_install_gpe_block)
 672
 673 /*******************************************************************************
 674  *
 675  * FUNCTION:    acpi_remove_gpe_block
 676  *
 677  * PARAMETERS:  gpe_device          - Handle to the parent GPE Block Device
 678  *
 679  * RETURN:      Status
 680  *
 681  * DESCRIPTION: Remove a previously installed block of GPE registers
 682  *
 683  ******************************************************************************/
 684 acpi_status acpi_remove_gpe_block(acpi_handle gpe_device)
 685 {
 686         union acpi_operand_object *obj_desc;
 687         acpi_status status;
 688         struct acpi_namespace_node *node;
 689
 690         ACPI_FUNCTION_TRACE(acpi_remove_gpe_block);
 691
 692         if (!gpe_device) {
 693                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 694         }
 695
 696         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
 697         if (ACPI_FAILURE(status)) {
 698                 return (status);
 699         }
 700
 701         node = acpi_ns_map_handle_to_node(gpe_device);
 702         if (!node) {
 703                 status = AE_BAD_PARAMETER;
 704                 goto unlock_and_exit;
 705         }
 706
 707         /* Get the device_object attached to the node */
 708
 709         obj_desc = acpi_ns_get_attached_object(node);
 710         if (!obj_desc || !obj_desc->device.gpe_block) {
 711                 return_ACPI_STATUS(AE_NULL_OBJECT);
 712         }
 713
 714         /* Delete the GPE block (but not the device_object) */
 715
 716         status = acpi_ev_delete_gpe_block(obj_desc->device.gpe_block);
 717         if (ACPI_SUCCESS(status)) {
 718                 obj_desc->device.gpe_block = NULL;
 719         }
 720
 721       unlock_and_exit:
 722         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 723         return_ACPI_STATUS(status);
 724 }
 725
 726 ACPI_EXPORT_SYMBOL(acpi_remove_gpe_block)
 727
 728 /*******************************************************************************
 729  *
 730  * FUNCTION:    acpi_get_gpe_device
 731  *
 732  * PARAMETERS:  Index               - System GPE index (0-current_gpe_count)
 733  *              gpe_device          - Where the parent GPE Device is returned
 734  *
 735  * RETURN:      Status
 736  *
 737  * DESCRIPTION: Obtain the GPE device associated with the input index. A NULL
 738  *              gpe device indicates that the gpe number is contained in one of
 739  *              the FADT-defined gpe blocks. Otherwise, the GPE block device.
 740  *
 741  ******************************************************************************/
 742 acpi_status
 743 acpi_get_gpe_device(u32 index, acpi_handle *gpe_device)
 744 {
 745         struct acpi_gpe_device_info info;
 746         acpi_status status;
 747
 748         ACPI_FUNCTION_TRACE(acpi_get_gpe_device);
 749
 750         if (!gpe_device) {
 751                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 752         }
 753
 754         if (index >= acpi_current_gpe_count) {
 755                 return_ACPI_STATUS(AE_NOT_EXIST);
 756         }
 757
 758         /* Setup and walk the GPE list */
 759
 760         info.index = index;
 761         info.status = AE_NOT_EXIST;
 762         info.gpe_device = NULL;
 763         info.next_block_base_index = 0;
 764
 765         status = acpi_ev_walk_gpe_list(acpi_ev_get_gpe_device, &info);
 766         if (ACPI_FAILURE(status)) {
 767                 return_ACPI_STATUS(status);
 768         }
 769
 770         *gpe_device = info.gpe_device;
 771         return_ACPI_STATUS(info.status);
 772 }
 773
 774 ACPI_EXPORT_SYMBOL(acpi_get_gpe_device)
 775
 776 /*******************************************************************************
 777  *
 778  * FUNCTION:    acpi_ev_get_gpe_device
 779  *
 780  * PARAMETERS:  GPE_WALK_CALLBACK
 781  *
 782  * RETURN:      Status
 783  *
 784  * DESCRIPTION: Matches the input GPE index (0-current_gpe_count) with a GPE
 785  *              block device. NULL if the GPE is one of the FADT-defined GPEs.
 786  *
 787  ******************************************************************************/
 788 static acpi_status
 789 acpi_ev_get_gpe_device(struct acpi_gpe_xrupt_info *gpe_xrupt_info,
 790                        struct acpi_gpe_block_info *gpe_block, void *context)
 791 {
 792         struct acpi_gpe_device_info *info = context;
 793
 794         /* Increment Index by the number of GPEs in this block */
 795
 796         info->next_block_base_index +=
 797             (gpe_block->register_count * ACPI_GPE_REGISTER_WIDTH);
 798
 799         if (info->index < info->next_block_base_index) {
 800                 /*
 801                  * The GPE index is within this block, get the node. Leave the node
 802                  * NULL for the FADT-defined GPEs
 803                  */
 804                 if ((gpe_block->node)->type == ACPI_TYPE_DEVICE) {
 805                         info->gpe_device = gpe_block->node;
 806                 }
 807
 808                 info->status = AE_OK;
 809                 return (AE_CTRL_END);
 810         }
 811
 812         return (AE_OK);
 813 }
 814
 815 /******************************************************************************
 816  *
 817  * FUNCTION:    acpi_disable_all_gpes
 818  *
 819  * PARAMETERS:  None
 820  *
 821  * RETURN:      Status
 822  *
 823  * DESCRIPTION: Disable and clear all GPEs in all GPE blocks
 824  *
 825  ******************************************************************************/
 826
 827 acpi_status acpi_disable_all_gpes(void)
 828 {
 829         acpi_status status;
 830
 831         ACPI_FUNCTION_TRACE(acpi_disable_all_gpes);
 832
 833         status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
 834         if (ACPI_FAILURE(status)) {
 835                 return_ACPI_STATUS(status);
 836         }
 837
 838         status = acpi_hw_disable_all_gpes();
 839         (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
 840
 841         return_ACPI_STATUS(status);
 842 }
 843
 844 /******************************************************************************
 845  *
 846  * FUNCTION:    acpi_enable_all_runtime_gpes
 847  *
 848  * PARAMETERS:  None
 849  *
 850  * RETURN:      Status
 851  *
 852  * DESCRIPTION: Enable all "runtime" GPEs, in all GPE blocks
 853  *
 854  ******************************************************************************/
 855
 856 acpi_status acpi_enable_all_runtime_gpes(void)
 857 {
 858         acpi_status status;
 859
 860         ACPI_FUNCTION_TRACE(acpi_enable_all_runtime_gpes);
 861
 862         status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
 863         if (ACPI_FAILURE(status)) {
 864                 return_ACPI_STATUS(status);
 865         }
 866
 867         status = acpi_hw_enable_all_runtime_gpes();
 868         (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
 869
 870         return_ACPI_STATUS(status);
 871 }