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 - 2010, 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;
  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                 return_ACPI_STATUS(AE_OK);
  88         }
  89
  90         /* Transition to ACPI mode */
  91
  92         status = acpi_hw_set_mode(ACPI_SYS_MODE_ACPI);
  93         if (ACPI_FAILURE(status)) {
  94                 ACPI_ERROR((AE_INFO,
  95                             "Could not transition to ACPI mode"));
  96                 return_ACPI_STATUS(status);
  97         }
  98
  99         /* Sanity check that transition succeeded */
 100
 101         if (acpi_hw_get_mode() != ACPI_SYS_MODE_ACPI) {
 102                 ACPI_ERROR((AE_INFO,
 103                             "Hardware did not enter ACPI mode"));
 104                 return_ACPI_STATUS(AE_NO_HARDWARE_RESPONSE);
 105         }
 106
 107         ACPI_DEBUG_PRINT((ACPI_DB_INIT,
 108                           "Transition to ACPI mode successful\n"));
 109
 110         return_ACPI_STATUS(AE_OK);
 111 }
 112
 113 ACPI_EXPORT_SYMBOL(acpi_enable)
 114
 115 /*******************************************************************************
 116  *
 117  * FUNCTION:    acpi_disable
 118  *
 119  * PARAMETERS:  None
 120  *
 121  * RETURN:      Status
 122  *
 123  * DESCRIPTION: Transfers the system into LEGACY (non-ACPI) mode.
 124  *
 125  ******************************************************************************/
 126 acpi_status acpi_disable(void)
 127 {
 128         acpi_status status = AE_OK;
 129
 130         ACPI_FUNCTION_TRACE(acpi_disable);
 131
 132         if (acpi_hw_get_mode() == ACPI_SYS_MODE_LEGACY) {
 133                 ACPI_DEBUG_PRINT((ACPI_DB_INIT,
 134                                   "System is already in legacy (non-ACPI) mode\n"));
 135         } else {
 136                 /* Transition to LEGACY mode */
 137
 138                 status = acpi_hw_set_mode(ACPI_SYS_MODE_LEGACY);
 139
 140                 if (ACPI_FAILURE(status)) {
 141                         ACPI_ERROR((AE_INFO,
 142                                     "Could not exit ACPI mode to legacy mode"));
 143                         return_ACPI_STATUS(status);
 144                 }
 145
 146                 ACPI_DEBUG_PRINT((ACPI_DB_INIT, "ACPI mode disabled\n"));
 147         }
 148
 149         return_ACPI_STATUS(status);
 150 }
 151
 152 ACPI_EXPORT_SYMBOL(acpi_disable)
 153
 154 /*******************************************************************************
 155  *
 156  * FUNCTION:    acpi_enable_event
 157  *
 158  * PARAMETERS:  Event           - The fixed eventto be enabled
 159  *              Flags           - Reserved
 160  *
 161  * RETURN:      Status
 162  *
 163  * DESCRIPTION: Enable an ACPI event (fixed)
 164  *
 165  ******************************************************************************/
 166 acpi_status acpi_enable_event(u32 event, u32 flags)
 167 {
 168         acpi_status status = AE_OK;
 169         u32 value;
 170
 171         ACPI_FUNCTION_TRACE(acpi_enable_event);
 172
 173         /* Decode the Fixed Event */
 174
 175         if (event > ACPI_EVENT_MAX) {
 176                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 177         }
 178
 179         /*
 180          * Enable the requested fixed event (by writing a one to the enable
 181          * register bit)
 182          */
 183         status =
 184             acpi_write_bit_register(acpi_gbl_fixed_event_info[event].
 185                                     enable_register_id, ACPI_ENABLE_EVENT);
 186         if (ACPI_FAILURE(status)) {
 187                 return_ACPI_STATUS(status);
 188         }
 189
 190         /* Make sure that the hardware responded */
 191
 192         status =
 193             acpi_read_bit_register(acpi_gbl_fixed_event_info[event].
 194                                    enable_register_id, &value);
 195         if (ACPI_FAILURE(status)) {
 196                 return_ACPI_STATUS(status);
 197         }
 198
 199         if (value != 1) {
 200                 ACPI_ERROR((AE_INFO,
 201                             "Could not enable %s event",
 202                             acpi_ut_get_event_name(event)));
 203                 return_ACPI_STATUS(AE_NO_HARDWARE_RESPONSE);
 204         }
 205
 206         return_ACPI_STATUS(status);
 207 }
 208
 209 ACPI_EXPORT_SYMBOL(acpi_enable_event)
 210
 211 /*******************************************************************************
 212  *
 213  * FUNCTION:    acpi_gpe_wakeup
 214  *
 215  * PARAMETERS:  gpe_device      - Parent GPE Device. NULL for GPE0/GPE1
 216  *              gpe_number      - GPE level within the GPE block
 217  *              Action          - Enable or Disable
 218  *
 219  * RETURN:      Status
 220  *
 221  * DESCRIPTION: Set or clear the GPE's wakeup enable mask bit.
 222  *
 223  ******************************************************************************/
 224 acpi_status acpi_gpe_wakeup(acpi_handle gpe_device, u32 gpe_number, u8 action)
 225 {
 226         acpi_status status = AE_OK;
 227         struct acpi_gpe_event_info *gpe_event_info;
 228         struct acpi_gpe_register_info *gpe_register_info;
 229         acpi_cpu_flags flags;
 230         u32 register_bit;
 231
 232         ACPI_FUNCTION_TRACE(acpi_gpe_wakeup);
 233
 234         flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
 235
 236         /* Ensure that we have a valid GPE number */
 237
 238         gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
 239         if (!gpe_event_info) {
 240                 status = AE_BAD_PARAMETER;
 241                 goto unlock_and_exit;
 242         }
 243
 244         gpe_register_info = gpe_event_info->register_info;
 245         if (!gpe_register_info) {
 246                 status = AE_NOT_EXIST;
 247                 goto unlock_and_exit;
 248         }
 249
 250         register_bit =
 251             acpi_hw_get_gpe_register_bit(gpe_event_info, gpe_register_info);
 252
 253         /* Perform the action */
 254
 255         switch (action) {
 256         case ACPI_GPE_ENABLE:
 257                 ACPI_SET_BIT(gpe_register_info->enable_for_wake,
 258                              (u8)register_bit);
 259                 break;
 260
 261         case ACPI_GPE_DISABLE:
 262                 ACPI_CLEAR_BIT(gpe_register_info->enable_for_wake,
 263                                (u8)register_bit);
 264                 break;
 265
 266         default:
 267                 ACPI_ERROR((AE_INFO, "%u, Invalid action", action));
 268                 status = AE_BAD_PARAMETER;
 269                 break;
 270         }
 271
 272 unlock_and_exit:
 273         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 274         return_ACPI_STATUS(status);
 275 }
 276
 277 ACPI_EXPORT_SYMBOL(acpi_gpe_wakeup)
 278
 279 /*******************************************************************************
 280  *
 281  * FUNCTION:    acpi_enable_gpe
 282  *
 283  * PARAMETERS:  gpe_device      - Parent GPE Device. NULL for GPE0/GPE1
 284  *              gpe_number      - GPE level within the GPE block
 285  *
 286  * RETURN:      Status
 287  *
 288  * DESCRIPTION: Add a reference to a GPE. On the first reference, the GPE is
 289  *              hardware-enabled.
 290  *
 291  ******************************************************************************/
 292 acpi_status acpi_enable_gpe(acpi_handle gpe_device, u32 gpe_number)
 293 {
 294         acpi_status status = AE_OK;
 295         struct acpi_gpe_event_info *gpe_event_info;
 296         acpi_cpu_flags flags;
 297
 298         ACPI_FUNCTION_TRACE(acpi_enable_gpe);
 299
 300         flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
 301
 302         /* Ensure that we have a valid GPE number */
 303
 304         gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
 305         if (!gpe_event_info) {
 306                 status = AE_BAD_PARAMETER;
 307                 goto unlock_and_exit;
 308         }
 309
 310         if (gpe_event_info->runtime_count == ACPI_UINT8_MAX) {
 311                 status = AE_LIMIT;      /* Too many references */
 312                 goto unlock_and_exit;
 313         }
 314
 315         gpe_event_info->runtime_count++;
 316         if (gpe_event_info->runtime_count == 1) {
 317                 status = acpi_ev_update_gpe_enable_mask(gpe_event_info);
 318                 if (ACPI_SUCCESS(status)) {
 319                         status = acpi_ev_enable_gpe(gpe_event_info);
 320                 }
 321                 if (ACPI_FAILURE(status)) {
 322                         gpe_event_info->runtime_count--;
 323                 }
 324         }
 325
 326 unlock_and_exit:
 327         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 328         return_ACPI_STATUS(status);
 329 }
 330 ACPI_EXPORT_SYMBOL(acpi_enable_gpe)
 331
 332 /*******************************************************************************
 333  *
 334  * FUNCTION:    acpi_disable_gpe
 335  *
 336  * PARAMETERS:  gpe_device      - Parent GPE Device. NULL for GPE0/GPE1
 337  *              gpe_number      - GPE level within the GPE block
 338  *
 339  * RETURN:      Status
 340  *
 341  * DESCRIPTION: Remove a reference to a GPE. When the last reference is
 342  *              removed, only then is the GPE disabled (for runtime GPEs), or
 343  *              the GPE mask bit disabled (for wake GPEs)
 344  *
 345  ******************************************************************************/
 346 acpi_status acpi_disable_gpe(acpi_handle gpe_device, u32 gpe_number)
 347 {
 348         acpi_status status = AE_OK;
 349         struct acpi_gpe_event_info *gpe_event_info;
 350         acpi_cpu_flags flags;
 351
 352         ACPI_FUNCTION_TRACE(acpi_disable_gpe);
 353
 354         flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
 355
 356         /* Ensure that we have a valid GPE number */
 357
 358         gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
 359         if (!gpe_event_info) {
 360                 status = AE_BAD_PARAMETER;
 361                 goto unlock_and_exit;
 362         }
 363
 364         /* Hardware-disable a runtime GPE on removal of the last reference */
 365
 366         if (!gpe_event_info->runtime_count) {
 367                 status = AE_LIMIT;      /* There are no references to remove */
 368                 goto unlock_and_exit;
 369         }
 370
 371         gpe_event_info->runtime_count--;
 372         if (!gpe_event_info->runtime_count) {
 373                 status = acpi_ev_update_gpe_enable_mask(gpe_event_info);
 374                 if (ACPI_SUCCESS(status)) {
 375                         status =
 376                             acpi_hw_low_set_gpe(gpe_event_info,
 377                                                 ACPI_GPE_DISABLE);
 378                 }
 379                 if (ACPI_FAILURE(status)) {
 380                         gpe_event_info->runtime_count++;
 381                 }
 382         }
 383
 384 unlock_and_exit:
 385         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 386         return_ACPI_STATUS(status);
 387 }
 388 ACPI_EXPORT_SYMBOL(acpi_disable_gpe)
 389
 390 /*******************************************************************************
 391  *
 392  * FUNCTION:    acpi_disable_event
 393  *
 394  * PARAMETERS:  Event           - The fixed eventto be enabled
 395  *              Flags           - Reserved
 396  *
 397  * RETURN:      Status
 398  *
 399  * DESCRIPTION: Disable an ACPI event (fixed)
 400  *
 401  ******************************************************************************/
 402 acpi_status acpi_disable_event(u32 event, u32 flags)
 403 {
 404         acpi_status status = AE_OK;
 405         u32 value;
 406
 407         ACPI_FUNCTION_TRACE(acpi_disable_event);
 408
 409         /* Decode the Fixed Event */
 410
 411         if (event > ACPI_EVENT_MAX) {
 412                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 413         }
 414
 415         /*
 416          * Disable the requested fixed event (by writing a zero to the enable
 417          * register bit)
 418          */
 419         status =
 420             acpi_write_bit_register(acpi_gbl_fixed_event_info[event].
 421                                     enable_register_id, ACPI_DISABLE_EVENT);
 422         if (ACPI_FAILURE(status)) {
 423                 return_ACPI_STATUS(status);
 424         }
 425
 426         status =
 427             acpi_read_bit_register(acpi_gbl_fixed_event_info[event].
 428                                    enable_register_id, &value);
 429         if (ACPI_FAILURE(status)) {
 430                 return_ACPI_STATUS(status);
 431         }
 432
 433         if (value != 0) {
 434                 ACPI_ERROR((AE_INFO,
 435                             "Could not disable %s events",
 436                             acpi_ut_get_event_name(event)));
 437                 return_ACPI_STATUS(AE_NO_HARDWARE_RESPONSE);
 438         }
 439
 440         return_ACPI_STATUS(status);
 441 }
 442
 443 ACPI_EXPORT_SYMBOL(acpi_disable_event)
 444
 445 /*******************************************************************************
 446  *
 447  * FUNCTION:    acpi_clear_event
 448  *
 449  * PARAMETERS:  Event           - The fixed event to be cleared
 450  *
 451  * RETURN:      Status
 452  *
 453  * DESCRIPTION: Clear an ACPI event (fixed)
 454  *
 455  ******************************************************************************/
 456 acpi_status acpi_clear_event(u32 event)
 457 {
 458         acpi_status status = AE_OK;
 459
 460         ACPI_FUNCTION_TRACE(acpi_clear_event);
 461
 462         /* Decode the Fixed Event */
 463
 464         if (event > ACPI_EVENT_MAX) {
 465                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 466         }
 467
 468         /*
 469          * Clear the requested fixed event (By writing a one to the status
 470          * register bit)
 471          */
 472         status =
 473             acpi_write_bit_register(acpi_gbl_fixed_event_info[event].
 474                                     status_register_id, ACPI_CLEAR_STATUS);
 475
 476         return_ACPI_STATUS(status);
 477 }
 478
 479 ACPI_EXPORT_SYMBOL(acpi_clear_event)
 480
 481 /*******************************************************************************
 482  *
 483  * FUNCTION:    acpi_clear_gpe
 484  *
 485  * PARAMETERS:  gpe_device      - Parent GPE Device. NULL for GPE0/GPE1
 486  *              gpe_number      - GPE level within the GPE block
 487  *
 488  * RETURN:      Status
 489  *
 490  * DESCRIPTION: Clear an ACPI event (general purpose)
 491  *
 492  ******************************************************************************/
 493 acpi_status acpi_clear_gpe(acpi_handle gpe_device, u32 gpe_number)
 494 {
 495         acpi_status status = AE_OK;
 496         struct acpi_gpe_event_info *gpe_event_info;
 497         acpi_cpu_flags flags;
 498
 499         ACPI_FUNCTION_TRACE(acpi_clear_gpe);
 500
 501         flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
 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         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 515         return_ACPI_STATUS(status);
 516 }
 517
 518 ACPI_EXPORT_SYMBOL(acpi_clear_gpe)
 519 /*******************************************************************************
 520  *
 521  * FUNCTION:    acpi_get_event_status
 522  *
 523  * PARAMETERS:  Event           - The fixed event
 524  *              event_status    - Where the current status of the event will
 525  *                                be returned
 526  *
 527  * RETURN:      Status
 528  *
 529  * DESCRIPTION: Obtains and returns the current status of the event
 530  *
 531  ******************************************************************************/
 532 acpi_status acpi_get_event_status(u32 event, acpi_event_status * event_status)
 533 {
 534         acpi_status status = AE_OK;
 535         u32 value;
 536
 537         ACPI_FUNCTION_TRACE(acpi_get_event_status);
 538
 539         if (!event_status) {
 540                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 541         }
 542
 543         /* Decode the Fixed Event */
 544
 545         if (event > ACPI_EVENT_MAX) {
 546                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 547         }
 548
 549         /* Get the status of the requested fixed event */
 550
 551         status =
 552             acpi_read_bit_register(acpi_gbl_fixed_event_info[event].
 553                               enable_register_id, &value);
 554         if (ACPI_FAILURE(status))
 555                 return_ACPI_STATUS(status);
 556
 557         *event_status = value;
 558
 559         status =
 560             acpi_read_bit_register(acpi_gbl_fixed_event_info[event].
 561                               status_register_id, &value);
 562         if (ACPI_FAILURE(status))
 563                 return_ACPI_STATUS(status);
 564
 565         if (value)
 566                 *event_status |= ACPI_EVENT_FLAG_SET;
 567
 568         if (acpi_gbl_fixed_event_handlers[event].handler)
 569                 *event_status |= ACPI_EVENT_FLAG_HANDLE;
 570
 571         return_ACPI_STATUS(status);
 572 }
 573
 574 ACPI_EXPORT_SYMBOL(acpi_get_event_status)
 575
 576 /*******************************************************************************
 577  *
 578  * FUNCTION:    acpi_get_gpe_status
 579  *
 580  * PARAMETERS:  gpe_device      - Parent GPE Device. NULL for GPE0/GPE1
 581  *              gpe_number      - GPE level within the GPE block
 582  *              event_status    - Where the current status of the event will
 583  *                                be returned
 584  *
 585  * RETURN:      Status
 586  *
 587  * DESCRIPTION: Get status of an event (general purpose)
 588  *
 589  ******************************************************************************/
 590 acpi_status
 591 acpi_get_gpe_status(acpi_handle gpe_device,
 592                     u32 gpe_number, acpi_event_status *event_status)
 593 {
 594         acpi_status status = AE_OK;
 595         struct acpi_gpe_event_info *gpe_event_info;
 596         acpi_cpu_flags flags;
 597
 598         ACPI_FUNCTION_TRACE(acpi_get_gpe_status);
 599
 600         flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
 601
 602         /* Ensure that we have a valid GPE number */
 603
 604         gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
 605         if (!gpe_event_info) {
 606                 status = AE_BAD_PARAMETER;
 607                 goto unlock_and_exit;
 608         }
 609
 610         /* Obtain status on the requested GPE number */
 611
 612         status = acpi_hw_get_gpe_status(gpe_event_info, event_status);
 613
 614         if (gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK)
 615                 *event_status |= ACPI_EVENT_FLAG_HANDLE;
 616
 617       unlock_and_exit:
 618         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 619         return_ACPI_STATUS(status);
 620 }
 621
 622 ACPI_EXPORT_SYMBOL(acpi_get_gpe_status)
 623 /*******************************************************************************
 624  *
 625  * FUNCTION:    acpi_install_gpe_block
 626  *
 627  * PARAMETERS:  gpe_device          - Handle to the parent GPE Block Device
 628  *              gpe_block_address   - Address and space_iD
 629  *              register_count      - Number of GPE register pairs in the block
 630  *              interrupt_number    - H/W interrupt for the block
 631  *
 632  * RETURN:      Status
 633  *
 634  * DESCRIPTION: Create and Install a block of GPE registers
 635  *
 636  ******************************************************************************/
 637 acpi_status
 638 acpi_install_gpe_block(acpi_handle gpe_device,
 639                        struct acpi_generic_address *gpe_block_address,
 640                        u32 register_count, u32 interrupt_number)
 641 {
 642         acpi_status status;
 643         union acpi_operand_object *obj_desc;
 644         struct acpi_namespace_node *node;
 645         struct acpi_gpe_block_info *gpe_block;
 646
 647         ACPI_FUNCTION_TRACE(acpi_install_gpe_block);
 648
 649         if ((!gpe_device) || (!gpe_block_address) || (!register_count)) {
 650                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 651         }
 652
 653         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
 654         if (ACPI_FAILURE(status)) {
 655                 return (status);
 656         }
 657
 658         node = acpi_ns_validate_handle(gpe_device);
 659         if (!node) {
 660                 status = AE_BAD_PARAMETER;
 661                 goto unlock_and_exit;
 662         }
 663
 664         /*
 665          * For user-installed GPE Block Devices, the gpe_block_base_number
 666          * is always zero
 667          */
 668         status =
 669             acpi_ev_create_gpe_block(node, gpe_block_address, register_count, 0,
 670                                      interrupt_number, &gpe_block);
 671         if (ACPI_FAILURE(status)) {
 672                 goto unlock_and_exit;
 673         }
 674
 675         /* Install block in the device_object attached to the node */
 676
 677         obj_desc = acpi_ns_get_attached_object(node);
 678         if (!obj_desc) {
 679
 680                 /*
 681                  * No object, create a new one (Device nodes do not always have
 682                  * an attached object)
 683                  */
 684                 obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_DEVICE);
 685                 if (!obj_desc) {
 686                         status = AE_NO_MEMORY;
 687                         goto unlock_and_exit;
 688                 }
 689
 690                 status =
 691                     acpi_ns_attach_object(node, obj_desc, ACPI_TYPE_DEVICE);
 692
 693                 /* Remove local reference to the object */
 694
 695                 acpi_ut_remove_reference(obj_desc);
 696
 697                 if (ACPI_FAILURE(status)) {
 698                         goto unlock_and_exit;
 699                 }
 700         }
 701
 702         /* Now install the GPE block in the device_object */
 703
 704         obj_desc->device.gpe_block = gpe_block;
 705
 706         /* Run the _PRW methods and enable the runtime GPEs in the new block */
 707
 708         status = acpi_ev_initialize_gpe_block(node, gpe_block);
 709
 710       unlock_and_exit:
 711         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 712         return_ACPI_STATUS(status);
 713 }
 714
 715 ACPI_EXPORT_SYMBOL(acpi_install_gpe_block)
 716
 717 /*******************************************************************************
 718  *
 719  * FUNCTION:    acpi_remove_gpe_block
 720  *
 721  * PARAMETERS:  gpe_device          - Handle to the parent GPE Block Device
 722  *
 723  * RETURN:      Status
 724  *
 725  * DESCRIPTION: Remove a previously installed block of GPE registers
 726  *
 727  ******************************************************************************/
 728 acpi_status acpi_remove_gpe_block(acpi_handle gpe_device)
 729 {
 730         union acpi_operand_object *obj_desc;
 731         acpi_status status;
 732         struct acpi_namespace_node *node;
 733
 734         ACPI_FUNCTION_TRACE(acpi_remove_gpe_block);
 735
 736         if (!gpe_device) {
 737                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 738         }
 739
 740         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
 741         if (ACPI_FAILURE(status)) {
 742                 return (status);
 743         }
 744
 745         node = acpi_ns_validate_handle(gpe_device);
 746         if (!node) {
 747                 status = AE_BAD_PARAMETER;
 748                 goto unlock_and_exit;
 749         }
 750
 751         /* Get the device_object attached to the node */
 752
 753         obj_desc = acpi_ns_get_attached_object(node);
 754         if (!obj_desc || !obj_desc->device.gpe_block) {
 755                 return_ACPI_STATUS(AE_NULL_OBJECT);
 756         }
 757
 758         /* Delete the GPE block (but not the device_object) */
 759
 760         status = acpi_ev_delete_gpe_block(obj_desc->device.gpe_block);
 761         if (ACPI_SUCCESS(status)) {
 762                 obj_desc->device.gpe_block = NULL;
 763         }
 764
 765       unlock_and_exit:
 766         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 767         return_ACPI_STATUS(status);
 768 }
 769
 770 ACPI_EXPORT_SYMBOL(acpi_remove_gpe_block)
 771
 772 /*******************************************************************************
 773  *
 774  * FUNCTION:    acpi_get_gpe_device
 775  *
 776  * PARAMETERS:  Index               - System GPE index (0-current_gpe_count)
 777  *              gpe_device          - Where the parent GPE Device is returned
 778  *
 779  * RETURN:      Status
 780  *
 781  * DESCRIPTION: Obtain the GPE device associated with the input index. A NULL
 782  *              gpe device indicates that the gpe number is contained in one of
 783  *              the FADT-defined gpe blocks. Otherwise, the GPE block device.
 784  *
 785  ******************************************************************************/
 786 acpi_status
 787 acpi_get_gpe_device(u32 index, acpi_handle *gpe_device)
 788 {
 789         struct acpi_gpe_device_info info;
 790         acpi_status status;
 791
 792         ACPI_FUNCTION_TRACE(acpi_get_gpe_device);
 793
 794         if (!gpe_device) {
 795                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 796         }
 797
 798         if (index >= acpi_current_gpe_count) {
 799                 return_ACPI_STATUS(AE_NOT_EXIST);
 800         }
 801
 802         /* Setup and walk the GPE list */
 803
 804         info.index = index;
 805         info.status = AE_NOT_EXIST;
 806         info.gpe_device = NULL;
 807         info.next_block_base_index = 0;
 808
 809         status = acpi_ev_walk_gpe_list(acpi_ev_get_gpe_device, &info);
 810         if (ACPI_FAILURE(status)) {
 811                 return_ACPI_STATUS(status);
 812         }
 813
 814         *gpe_device = info.gpe_device;
 815         return_ACPI_STATUS(info.status);
 816 }
 817
 818 ACPI_EXPORT_SYMBOL(acpi_get_gpe_device)
 819
 820 /*******************************************************************************
 821  *
 822  * FUNCTION:    acpi_ev_get_gpe_device
 823  *
 824  * PARAMETERS:  GPE_WALK_CALLBACK
 825  *
 826  * RETURN:      Status
 827  *
 828  * DESCRIPTION: Matches the input GPE index (0-current_gpe_count) with a GPE
 829  *              block device. NULL if the GPE is one of the FADT-defined GPEs.
 830  *
 831  ******************************************************************************/
 832 static acpi_status
 833 acpi_ev_get_gpe_device(struct acpi_gpe_xrupt_info *gpe_xrupt_info,
 834                        struct acpi_gpe_block_info *gpe_block, void *context)
 835 {
 836         struct acpi_gpe_device_info *info = context;
 837
 838         /* Increment Index by the number of GPEs in this block */
 839
 840         info->next_block_base_index += gpe_block->gpe_count;
 841
 842         if (info->index < info->next_block_base_index) {
 843                 /*
 844                  * The GPE index is within this block, get the node. Leave the node
 845                  * NULL for the FADT-defined GPEs
 846                  */
 847                 if ((gpe_block->node)->type == ACPI_TYPE_DEVICE) {
 848                         info->gpe_device = gpe_block->node;
 849                 }
 850
 851                 info->status = AE_OK;
 852                 return (AE_CTRL_END);
 853         }
 854
 855         return (AE_OK);
 856 }
 857
 858 /******************************************************************************
 859  *
 860  * FUNCTION:    acpi_disable_all_gpes
 861  *
 862  * PARAMETERS:  None
 863  *
 864  * RETURN:      Status
 865  *
 866  * DESCRIPTION: Disable and clear all GPEs in all GPE blocks
 867  *
 868  ******************************************************************************/
 869
 870 acpi_status acpi_disable_all_gpes(void)
 871 {
 872         acpi_status status;
 873
 874         ACPI_FUNCTION_TRACE(acpi_disable_all_gpes);
 875
 876         status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
 877         if (ACPI_FAILURE(status)) {
 878                 return_ACPI_STATUS(status);
 879         }
 880
 881         status = acpi_hw_disable_all_gpes();
 882         (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
 883
 884         return_ACPI_STATUS(status);
 885 }
 886
 887 /******************************************************************************
 888  *
 889  * FUNCTION:    acpi_enable_all_runtime_gpes
 890  *
 891  * PARAMETERS:  None
 892  *
 893  * RETURN:      Status
 894  *
 895  * DESCRIPTION: Enable all "runtime" GPEs, in all GPE blocks
 896  *
 897  ******************************************************************************/
 898
 899 acpi_status acpi_enable_all_runtime_gpes(void)
 900 {
 901         acpi_status status;
 902
 903         ACPI_FUNCTION_TRACE(acpi_enable_all_runtime_gpes);
 904
 905         status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
 906         if (ACPI_FAILURE(status)) {
 907                 return_ACPI_STATUS(status);
 908         }
 909
 910         status = acpi_hw_enable_all_runtime_gpes();
 911         (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
 912
 913         return_ACPI_STATUS(status);
 914 }