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_set_gpe
 214  *
 215  * PARAMETERS:  gpe_device      - Parent GPE Device. NULL for GPE0/GPE1
 216  *              gpe_number      - GPE level within the GPE block
 217  *              action          - ACPI_GPE_ENABLE or ACPI_GPE_DISABLE
 218  *
 219  * RETURN:      Status
 220  *
 221  * DESCRIPTION: Enable or disable an individual GPE. This function bypasses
 222  *              the reference count mechanism used in the acpi_enable_gpe and
 223  *              acpi_disable_gpe interfaces -- and should be used with care.
 224  *
 225  * Note: Typically used to disable a runtime GPE for short period of time,
 226  * then re-enable it, without disturbing the existing reference counts. This
 227  * is useful, for example, in the Embedded Controller (EC) driver.
 228  *
 229  ******************************************************************************/
 230 acpi_status acpi_set_gpe(acpi_handle gpe_device, u32 gpe_number, u8 action)
 231 {
 232         struct acpi_gpe_event_info *gpe_event_info;
 233         acpi_status status;
 234         acpi_cpu_flags flags;
 235
 236         ACPI_FUNCTION_TRACE(acpi_set_gpe);
 237
 238         flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
 239
 240         /* Ensure that we have a valid GPE number */
 241
 242         gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
 243         if (!gpe_event_info) {
 244                 status = AE_BAD_PARAMETER;
 245                 goto unlock_and_exit;
 246         }
 247
 248         /* Perform the action */
 249
 250         switch (action) {
 251         case ACPI_GPE_ENABLE:
 252                 status = acpi_ev_enable_gpe(gpe_event_info);
 253                 break;
 254
 255         case ACPI_GPE_DISABLE:
 256                 status = acpi_hw_low_set_gpe(gpe_event_info, ACPI_GPE_DISABLE);
 257                 break;
 258
 259         default:
 260                 status = AE_BAD_PARAMETER;
 261                 break;
 262         }
 263
 264       unlock_and_exit:
 265         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 266         return_ACPI_STATUS(status);
 267 }
 268
 269 ACPI_EXPORT_SYMBOL(acpi_set_gpe)
 270
 271 /*******************************************************************************
 272  *
 273  * FUNCTION:    acpi_gpe_wakeup
 274  *
 275  * PARAMETERS:  gpe_device      - Parent GPE Device. NULL for GPE0/GPE1
 276  *              gpe_number      - GPE level within the GPE block
 277  *              Action          - Enable or Disable
 278  *
 279  * RETURN:      Status
 280  *
 281  * DESCRIPTION: Set or clear the GPE's wakeup enable mask bit.
 282  *
 283  ******************************************************************************/
 284 acpi_status acpi_gpe_wakeup(acpi_handle gpe_device, u32 gpe_number, u8 action)
 285 {
 286         acpi_status status = AE_OK;
 287         struct acpi_gpe_event_info *gpe_event_info;
 288         struct acpi_gpe_register_info *gpe_register_info;
 289         acpi_cpu_flags flags;
 290         u32 register_bit;
 291
 292         ACPI_FUNCTION_TRACE(acpi_gpe_wakeup);
 293
 294         flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
 295
 296         /* Ensure that we have a valid GPE number */
 297
 298         gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
 299         if (!gpe_event_info) {
 300                 status = AE_BAD_PARAMETER;
 301                 goto unlock_and_exit;
 302         }
 303
 304         gpe_register_info = gpe_event_info->register_info;
 305         if (!gpe_register_info) {
 306                 status = AE_NOT_EXIST;
 307                 goto unlock_and_exit;
 308         }
 309
 310         register_bit =
 311             acpi_hw_get_gpe_register_bit(gpe_event_info, gpe_register_info);
 312
 313         /* Perform the action */
 314
 315         switch (action) {
 316         case ACPI_GPE_ENABLE:
 317                 ACPI_SET_BIT(gpe_register_info->enable_for_wake,
 318                              (u8)register_bit);
 319                 break;
 320
 321         case ACPI_GPE_DISABLE:
 322                 ACPI_CLEAR_BIT(gpe_register_info->enable_for_wake,
 323                                (u8)register_bit);
 324                 break;
 325
 326         default:
 327                 ACPI_ERROR((AE_INFO, "%u, Invalid action", action));
 328                 status = AE_BAD_PARAMETER;
 329                 break;
 330         }
 331
 332 unlock_and_exit:
 333         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 334         return_ACPI_STATUS(status);
 335 }
 336
 337 ACPI_EXPORT_SYMBOL(acpi_gpe_wakeup)
 338
 339 /*******************************************************************************
 340  *
 341  * FUNCTION:    acpi_enable_gpe
 342  *
 343  * PARAMETERS:  gpe_device      - Parent GPE Device. NULL for GPE0/GPE1
 344  *              gpe_number      - GPE level within the GPE block
 345  *
 346  * RETURN:      Status
 347  *
 348  * DESCRIPTION: Add a reference to a GPE. On the first reference, the GPE is
 349  *              hardware-enabled.
 350  *
 351  ******************************************************************************/
 352 acpi_status acpi_enable_gpe(acpi_handle gpe_device, u32 gpe_number)
 353 {
 354         acpi_status status = AE_OK;
 355         struct acpi_gpe_event_info *gpe_event_info;
 356         acpi_cpu_flags flags;
 357
 358         ACPI_FUNCTION_TRACE(acpi_enable_gpe);
 359
 360         flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
 361
 362         /* Ensure that we have a valid GPE number */
 363
 364         gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
 365         if (!gpe_event_info) {
 366                 status = AE_BAD_PARAMETER;
 367                 goto unlock_and_exit;
 368         }
 369
 370         if (gpe_event_info->runtime_count == ACPI_UINT8_MAX) {
 371                 status = AE_LIMIT;      /* Too many references */
 372                 goto unlock_and_exit;
 373         }
 374
 375         gpe_event_info->runtime_count++;
 376         if (gpe_event_info->runtime_count == 1) {
 377                 status = acpi_ev_update_gpe_enable_mask(gpe_event_info);
 378                 if (ACPI_SUCCESS(status)) {
 379                         status = acpi_ev_enable_gpe(gpe_event_info);
 380                 }
 381                 if (ACPI_FAILURE(status)) {
 382                         gpe_event_info->runtime_count--;
 383                 }
 384         }
 385
 386 unlock_and_exit:
 387         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 388         return_ACPI_STATUS(status);
 389 }
 390 ACPI_EXPORT_SYMBOL(acpi_enable_gpe)
 391
 392 /*******************************************************************************
 393  *
 394  * FUNCTION:    acpi_disable_gpe
 395  *
 396  * PARAMETERS:  gpe_device      - Parent GPE Device. NULL for GPE0/GPE1
 397  *              gpe_number      - GPE level within the GPE block
 398  *
 399  * RETURN:      Status
 400  *
 401  * DESCRIPTION: Remove a reference to a GPE. When the last reference is
 402  *              removed, only then is the GPE disabled (for runtime GPEs), or
 403  *              the GPE mask bit disabled (for wake GPEs)
 404  *
 405  ******************************************************************************/
 406 acpi_status acpi_disable_gpe(acpi_handle gpe_device, u32 gpe_number)
 407 {
 408         acpi_status status = AE_OK;
 409         struct acpi_gpe_event_info *gpe_event_info;
 410         acpi_cpu_flags flags;
 411
 412         ACPI_FUNCTION_TRACE(acpi_disable_gpe);
 413
 414         flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
 415
 416         /* Ensure that we have a valid GPE number */
 417
 418         gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
 419         if (!gpe_event_info) {
 420                 status = AE_BAD_PARAMETER;
 421                 goto unlock_and_exit;
 422         }
 423
 424         /* Hardware-disable a runtime GPE on removal of the last reference */
 425
 426         if (!gpe_event_info->runtime_count) {
 427                 status = AE_LIMIT;      /* There are no references to remove */
 428                 goto unlock_and_exit;
 429         }
 430
 431         gpe_event_info->runtime_count--;
 432         if (!gpe_event_info->runtime_count) {
 433                 status = acpi_ev_update_gpe_enable_mask(gpe_event_info);
 434                 if (ACPI_SUCCESS(status)) {
 435                         status =
 436                             acpi_hw_low_set_gpe(gpe_event_info,
 437                                                 ACPI_GPE_DISABLE);
 438                 }
 439                 if (ACPI_FAILURE(status)) {
 440                         gpe_event_info->runtime_count++;
 441                 }
 442         }
 443
 444 unlock_and_exit:
 445         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 446         return_ACPI_STATUS(status);
 447 }
 448 ACPI_EXPORT_SYMBOL(acpi_disable_gpe)
 449
 450 /*******************************************************************************
 451  *
 452  * FUNCTION:    acpi_disable_event
 453  *
 454  * PARAMETERS:  Event           - The fixed eventto be enabled
 455  *              Flags           - Reserved
 456  *
 457  * RETURN:      Status
 458  *
 459  * DESCRIPTION: Disable an ACPI event (fixed)
 460  *
 461  ******************************************************************************/
 462 acpi_status acpi_disable_event(u32 event, u32 flags)
 463 {
 464         acpi_status status = AE_OK;
 465         u32 value;
 466
 467         ACPI_FUNCTION_TRACE(acpi_disable_event);
 468
 469         /* Decode the Fixed Event */
 470
 471         if (event > ACPI_EVENT_MAX) {
 472                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 473         }
 474
 475         /*
 476          * Disable the requested fixed event (by writing a zero to the enable
 477          * register bit)
 478          */
 479         status =
 480             acpi_write_bit_register(acpi_gbl_fixed_event_info[event].
 481                                     enable_register_id, ACPI_DISABLE_EVENT);
 482         if (ACPI_FAILURE(status)) {
 483                 return_ACPI_STATUS(status);
 484         }
 485
 486         status =
 487             acpi_read_bit_register(acpi_gbl_fixed_event_info[event].
 488                                    enable_register_id, &value);
 489         if (ACPI_FAILURE(status)) {
 490                 return_ACPI_STATUS(status);
 491         }
 492
 493         if (value != 0) {
 494                 ACPI_ERROR((AE_INFO,
 495                             "Could not disable %s events",
 496                             acpi_ut_get_event_name(event)));
 497                 return_ACPI_STATUS(AE_NO_HARDWARE_RESPONSE);
 498         }
 499
 500         return_ACPI_STATUS(status);
 501 }
 502
 503 ACPI_EXPORT_SYMBOL(acpi_disable_event)
 504
 505 /*******************************************************************************
 506  *
 507  * FUNCTION:    acpi_clear_event
 508  *
 509  * PARAMETERS:  Event           - The fixed event to be cleared
 510  *
 511  * RETURN:      Status
 512  *
 513  * DESCRIPTION: Clear an ACPI event (fixed)
 514  *
 515  ******************************************************************************/
 516 acpi_status acpi_clear_event(u32 event)
 517 {
 518         acpi_status status = AE_OK;
 519
 520         ACPI_FUNCTION_TRACE(acpi_clear_event);
 521
 522         /* Decode the Fixed Event */
 523
 524         if (event > ACPI_EVENT_MAX) {
 525                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 526         }
 527
 528         /*
 529          * Clear the requested fixed event (By writing a one to the status
 530          * register bit)
 531          */
 532         status =
 533             acpi_write_bit_register(acpi_gbl_fixed_event_info[event].
 534                                     status_register_id, ACPI_CLEAR_STATUS);
 535
 536         return_ACPI_STATUS(status);
 537 }
 538
 539 ACPI_EXPORT_SYMBOL(acpi_clear_event)
 540
 541 /*******************************************************************************
 542  *
 543  * FUNCTION:    acpi_clear_gpe
 544  *
 545  * PARAMETERS:  gpe_device      - Parent GPE Device. NULL for GPE0/GPE1
 546  *              gpe_number      - GPE level within the GPE block
 547  *
 548  * RETURN:      Status
 549  *
 550  * DESCRIPTION: Clear an ACPI event (general purpose)
 551  *
 552  ******************************************************************************/
 553 acpi_status acpi_clear_gpe(acpi_handle gpe_device, u32 gpe_number)
 554 {
 555         acpi_status status = AE_OK;
 556         struct acpi_gpe_event_info *gpe_event_info;
 557         acpi_cpu_flags flags;
 558
 559         ACPI_FUNCTION_TRACE(acpi_clear_gpe);
 560
 561         flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
 562
 563         /* Ensure that we have a valid GPE number */
 564
 565         gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
 566         if (!gpe_event_info) {
 567                 status = AE_BAD_PARAMETER;
 568                 goto unlock_and_exit;
 569         }
 570
 571         status = acpi_hw_clear_gpe(gpe_event_info);
 572
 573       unlock_and_exit:
 574         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 575         return_ACPI_STATUS(status);
 576 }
 577
 578 ACPI_EXPORT_SYMBOL(acpi_clear_gpe)
 579 /*******************************************************************************
 580  *
 581  * FUNCTION:    acpi_get_event_status
 582  *
 583  * PARAMETERS:  Event           - The fixed event
 584  *              event_status    - Where the current status of the event will
 585  *                                be returned
 586  *
 587  * RETURN:      Status
 588  *
 589  * DESCRIPTION: Obtains and returns the current status of the event
 590  *
 591  ******************************************************************************/
 592 acpi_status acpi_get_event_status(u32 event, acpi_event_status * event_status)
 593 {
 594         acpi_status status = AE_OK;
 595         u32 value;
 596
 597         ACPI_FUNCTION_TRACE(acpi_get_event_status);
 598
 599         if (!event_status) {
 600                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 601         }
 602
 603         /* Decode the Fixed Event */
 604
 605         if (event > ACPI_EVENT_MAX) {
 606                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 607         }
 608
 609         /* Get the status of the requested fixed event */
 610
 611         status =
 612             acpi_read_bit_register(acpi_gbl_fixed_event_info[event].
 613                               enable_register_id, &value);
 614         if (ACPI_FAILURE(status))
 615                 return_ACPI_STATUS(status);
 616
 617         *event_status = value;
 618
 619         status =
 620             acpi_read_bit_register(acpi_gbl_fixed_event_info[event].
 621                               status_register_id, &value);
 622         if (ACPI_FAILURE(status))
 623                 return_ACPI_STATUS(status);
 624
 625         if (value)
 626                 *event_status |= ACPI_EVENT_FLAG_SET;
 627
 628         if (acpi_gbl_fixed_event_handlers[event].handler)
 629                 *event_status |= ACPI_EVENT_FLAG_HANDLE;
 630
 631         return_ACPI_STATUS(status);
 632 }
 633
 634 ACPI_EXPORT_SYMBOL(acpi_get_event_status)
 635
 636 /*******************************************************************************
 637  *
 638  * FUNCTION:    acpi_get_gpe_status
 639  *
 640  * PARAMETERS:  gpe_device      - Parent GPE Device. NULL for GPE0/GPE1
 641  *              gpe_number      - GPE level within the GPE block
 642  *              event_status    - Where the current status of the event will
 643  *                                be returned
 644  *
 645  * RETURN:      Status
 646  *
 647  * DESCRIPTION: Get status of an event (general purpose)
 648  *
 649  ******************************************************************************/
 650 acpi_status
 651 acpi_get_gpe_status(acpi_handle gpe_device,
 652                     u32 gpe_number, acpi_event_status *event_status)
 653 {
 654         acpi_status status = AE_OK;
 655         struct acpi_gpe_event_info *gpe_event_info;
 656         acpi_cpu_flags flags;
 657
 658         ACPI_FUNCTION_TRACE(acpi_get_gpe_status);
 659
 660         flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
 661
 662         /* Ensure that we have a valid GPE number */
 663
 664         gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
 665         if (!gpe_event_info) {
 666                 status = AE_BAD_PARAMETER;
 667                 goto unlock_and_exit;
 668         }
 669
 670         /* Obtain status on the requested GPE number */
 671
 672         status = acpi_hw_get_gpe_status(gpe_event_info, event_status);
 673
 674         if (gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK)
 675                 *event_status |= ACPI_EVENT_FLAG_HANDLE;
 676
 677       unlock_and_exit:
 678         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 679         return_ACPI_STATUS(status);
 680 }
 681
 682 ACPI_EXPORT_SYMBOL(acpi_get_gpe_status)
 683 /*******************************************************************************
 684  *
 685  * FUNCTION:    acpi_install_gpe_block
 686  *
 687  * PARAMETERS:  gpe_device          - Handle to the parent GPE Block Device
 688  *              gpe_block_address   - Address and space_iD
 689  *              register_count      - Number of GPE register pairs in the block
 690  *              interrupt_number    - H/W interrupt for the block
 691  *
 692  * RETURN:      Status
 693  *
 694  * DESCRIPTION: Create and Install a block of GPE registers
 695  *
 696  ******************************************************************************/
 697 acpi_status
 698 acpi_install_gpe_block(acpi_handle gpe_device,
 699                        struct acpi_generic_address *gpe_block_address,
 700                        u32 register_count, u32 interrupt_number)
 701 {
 702         acpi_status status;
 703         union acpi_operand_object *obj_desc;
 704         struct acpi_namespace_node *node;
 705         struct acpi_gpe_block_info *gpe_block;
 706
 707         ACPI_FUNCTION_TRACE(acpi_install_gpe_block);
 708
 709         if ((!gpe_device) || (!gpe_block_address) || (!register_count)) {
 710                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 711         }
 712
 713         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
 714         if (ACPI_FAILURE(status)) {
 715                 return (status);
 716         }
 717
 718         node = acpi_ns_validate_handle(gpe_device);
 719         if (!node) {
 720                 status = AE_BAD_PARAMETER;
 721                 goto unlock_and_exit;
 722         }
 723
 724         /*
 725          * For user-installed GPE Block Devices, the gpe_block_base_number
 726          * is always zero
 727          */
 728         status =
 729             acpi_ev_create_gpe_block(node, gpe_block_address, register_count, 0,
 730                                      interrupt_number, &gpe_block);
 731         if (ACPI_FAILURE(status)) {
 732                 goto unlock_and_exit;
 733         }
 734
 735         /* Install block in the device_object attached to the node */
 736
 737         obj_desc = acpi_ns_get_attached_object(node);
 738         if (!obj_desc) {
 739
 740                 /*
 741                  * No object, create a new one (Device nodes do not always have
 742                  * an attached object)
 743                  */
 744                 obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_DEVICE);
 745                 if (!obj_desc) {
 746                         status = AE_NO_MEMORY;
 747                         goto unlock_and_exit;
 748                 }
 749
 750                 status =
 751                     acpi_ns_attach_object(node, obj_desc, ACPI_TYPE_DEVICE);
 752
 753                 /* Remove local reference to the object */
 754
 755                 acpi_ut_remove_reference(obj_desc);
 756
 757                 if (ACPI_FAILURE(status)) {
 758                         goto unlock_and_exit;
 759                 }
 760         }
 761
 762         /* Now install the GPE block in the device_object */
 763
 764         obj_desc->device.gpe_block = gpe_block;
 765
 766         /* Run the _PRW methods and enable the runtime GPEs in the new block */
 767
 768         status = acpi_ev_initialize_gpe_block(node, gpe_block);
 769
 770       unlock_and_exit:
 771         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 772         return_ACPI_STATUS(status);
 773 }
 774
 775 ACPI_EXPORT_SYMBOL(acpi_install_gpe_block)
 776
 777 /*******************************************************************************
 778  *
 779  * FUNCTION:    acpi_remove_gpe_block
 780  *
 781  * PARAMETERS:  gpe_device          - Handle to the parent GPE Block Device
 782  *
 783  * RETURN:      Status
 784  *
 785  * DESCRIPTION: Remove a previously installed block of GPE registers
 786  *
 787  ******************************************************************************/
 788 acpi_status acpi_remove_gpe_block(acpi_handle gpe_device)
 789 {
 790         union acpi_operand_object *obj_desc;
 791         acpi_status status;
 792         struct acpi_namespace_node *node;
 793
 794         ACPI_FUNCTION_TRACE(acpi_remove_gpe_block);
 795
 796         if (!gpe_device) {
 797                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 798         }
 799
 800         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
 801         if (ACPI_FAILURE(status)) {
 802                 return (status);
 803         }
 804
 805         node = acpi_ns_validate_handle(gpe_device);
 806         if (!node) {
 807                 status = AE_BAD_PARAMETER;
 808                 goto unlock_and_exit;
 809         }
 810
 811         /* Get the device_object attached to the node */
 812
 813         obj_desc = acpi_ns_get_attached_object(node);
 814         if (!obj_desc || !obj_desc->device.gpe_block) {
 815                 return_ACPI_STATUS(AE_NULL_OBJECT);
 816         }
 817
 818         /* Delete the GPE block (but not the device_object) */
 819
 820         status = acpi_ev_delete_gpe_block(obj_desc->device.gpe_block);
 821         if (ACPI_SUCCESS(status)) {
 822                 obj_desc->device.gpe_block = NULL;
 823         }
 824
 825       unlock_and_exit:
 826         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 827         return_ACPI_STATUS(status);
 828 }
 829
 830 ACPI_EXPORT_SYMBOL(acpi_remove_gpe_block)
 831
 832 /*******************************************************************************
 833  *
 834  * FUNCTION:    acpi_get_gpe_device
 835  *
 836  * PARAMETERS:  Index               - System GPE index (0-current_gpe_count)
 837  *              gpe_device          - Where the parent GPE Device is returned
 838  *
 839  * RETURN:      Status
 840  *
 841  * DESCRIPTION: Obtain the GPE device associated with the input index. A NULL
 842  *              gpe device indicates that the gpe number is contained in one of
 843  *              the FADT-defined gpe blocks. Otherwise, the GPE block device.
 844  *
 845  ******************************************************************************/
 846 acpi_status
 847 acpi_get_gpe_device(u32 index, acpi_handle *gpe_device)
 848 {
 849         struct acpi_gpe_device_info info;
 850         acpi_status status;
 851
 852         ACPI_FUNCTION_TRACE(acpi_get_gpe_device);
 853
 854         if (!gpe_device) {
 855                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 856         }
 857
 858         if (index >= acpi_current_gpe_count) {
 859                 return_ACPI_STATUS(AE_NOT_EXIST);
 860         }
 861
 862         /* Setup and walk the GPE list */
 863
 864         info.index = index;
 865         info.status = AE_NOT_EXIST;
 866         info.gpe_device = NULL;
 867         info.next_block_base_index = 0;
 868
 869         status = acpi_ev_walk_gpe_list(acpi_ev_get_gpe_device, &info);
 870         if (ACPI_FAILURE(status)) {
 871                 return_ACPI_STATUS(status);
 872         }
 873
 874         *gpe_device = info.gpe_device;
 875         return_ACPI_STATUS(info.status);
 876 }
 877
 878 ACPI_EXPORT_SYMBOL(acpi_get_gpe_device)
 879
 880 /*******************************************************************************
 881  *
 882  * FUNCTION:    acpi_ev_get_gpe_device
 883  *
 884  * PARAMETERS:  GPE_WALK_CALLBACK
 885  *
 886  * RETURN:      Status
 887  *
 888  * DESCRIPTION: Matches the input GPE index (0-current_gpe_count) with a GPE
 889  *              block device. NULL if the GPE is one of the FADT-defined GPEs.
 890  *
 891  ******************************************************************************/
 892 static acpi_status
 893 acpi_ev_get_gpe_device(struct acpi_gpe_xrupt_info *gpe_xrupt_info,
 894                        struct acpi_gpe_block_info *gpe_block, void *context)
 895 {
 896         struct acpi_gpe_device_info *info = context;
 897
 898         /* Increment Index by the number of GPEs in this block */
 899
 900         info->next_block_base_index += gpe_block->gpe_count;
 901
 902         if (info->index < info->next_block_base_index) {
 903                 /*
 904                  * The GPE index is within this block, get the node. Leave the node
 905                  * NULL for the FADT-defined GPEs
 906                  */
 907                 if ((gpe_block->node)->type == ACPI_TYPE_DEVICE) {
 908                         info->gpe_device = gpe_block->node;
 909                 }
 910
 911                 info->status = AE_OK;
 912                 return (AE_CTRL_END);
 913         }
 914
 915         return (AE_OK);
 916 }
 917
 918 /******************************************************************************
 919  *
 920  * FUNCTION:    acpi_disable_all_gpes
 921  *
 922  * PARAMETERS:  None
 923  *
 924  * RETURN:      Status
 925  *
 926  * DESCRIPTION: Disable and clear all GPEs in all GPE blocks
 927  *
 928  ******************************************************************************/
 929
 930 acpi_status acpi_disable_all_gpes(void)
 931 {
 932         acpi_status status;
 933
 934         ACPI_FUNCTION_TRACE(acpi_disable_all_gpes);
 935
 936         status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
 937         if (ACPI_FAILURE(status)) {
 938                 return_ACPI_STATUS(status);
 939         }
 940
 941         status = acpi_hw_disable_all_gpes();
 942         (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
 943
 944         return_ACPI_STATUS(status);
 945 }
 946
 947 /******************************************************************************
 948  *
 949  * FUNCTION:    acpi_enable_all_runtime_gpes
 950  *
 951  * PARAMETERS:  None
 952  *
 953  * RETURN:      Status
 954  *
 955  * DESCRIPTION: Enable all "runtime" GPEs, in all GPE blocks
 956  *
 957  ******************************************************************************/
 958
 959 acpi_status acpi_enable_all_runtime_gpes(void)
 960 {
 961         acpi_status status;
 962
 963         ACPI_FUNCTION_TRACE(acpi_enable_all_runtime_gpes);
 964
 965         status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
 966         if (ACPI_FAILURE(status)) {
 967                 return_ACPI_STATUS(status);
 968         }
 969
 970         status = acpi_hw_enable_all_runtime_gpes();
 971         (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
 972
 973         return_ACPI_STATUS(status);
 974 }