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 = 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_clear_and_enable_gpe
 205  *
 206  * PARAMETERS:  gpe_event_info  - GPE to enable
 207  *
 208  * RETURN:      Status
 209  *
 210  * DESCRIPTION: Clear the given GPE from stale events and enable it.
 211  *
 212  ******************************************************************************/
 213 static acpi_status
 214 acpi_clear_and_enable_gpe(struct acpi_gpe_event_info *gpe_event_info)
 215 {
 216         acpi_status status;
 217
 218         /*
 219          * We will only allow a GPE to be enabled if it has either an
 220          * associated method (_Lxx/_Exx) or a handler. Otherwise, the
 221          * GPE will be immediately disabled by acpi_ev_gpe_dispatch the
 222          * first time it fires.
 223          */
 224         if (!(gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK)) {
 225                 return_ACPI_STATUS(AE_NO_HANDLER);
 226         }
 227
 228         /* Clear the GPE (of stale events) */
 229         status = acpi_hw_clear_gpe(gpe_event_info);
 230         if (ACPI_FAILURE(status)) {
 231                 return_ACPI_STATUS(status);
 232         }
 233
 234         /* Enable the requested GPE */
 235         status = acpi_hw_low_set_gpe(gpe_event_info, ACPI_GPE_ENABLE);
 236
 237         return_ACPI_STATUS(status);
 238 }
 239
 240 /*******************************************************************************
 241  *
 242  * FUNCTION:    acpi_set_gpe
 243  *
 244  * PARAMETERS:  gpe_device      - Parent GPE Device. NULL for GPE0/GPE1
 245  *              gpe_number      - GPE level within the GPE block
 246  *              action          - ACPI_GPE_ENABLE or ACPI_GPE_DISABLE
 247  *
 248  * RETURN:      Status
 249  *
 250  * DESCRIPTION: Enable or disable an individual GPE. This function bypasses
 251  *              the reference count mechanism used in the acpi_enable_gpe and
 252  *              acpi_disable_gpe interfaces -- and should be used with care.
 253  *
 254  * Note: Typically used to disable a runtime GPE for short period of time,
 255  * then re-enable it, without disturbing the existing reference counts. This
 256  * is useful, for example, in the Embedded Controller (EC) driver.
 257  *
 258  ******************************************************************************/
 259 acpi_status acpi_set_gpe(acpi_handle gpe_device, u32 gpe_number, u8 action)
 260 {
 261         struct acpi_gpe_event_info *gpe_event_info;
 262         acpi_status status;
 263         acpi_cpu_flags flags;
 264
 265         ACPI_FUNCTION_TRACE(acpi_set_gpe);
 266
 267         flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
 268
 269         /* Ensure that we have a valid GPE number */
 270
 271         gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
 272         if (!gpe_event_info) {
 273                 status = AE_BAD_PARAMETER;
 274                 goto unlock_and_exit;
 275         }
 276
 277         /* Perform the action */
 278
 279         switch (action) {
 280         case ACPI_GPE_ENABLE:
 281                 status = acpi_clear_and_enable_gpe(gpe_event_info);
 282                 break;
 283
 284         case ACPI_GPE_DISABLE:
 285                 status = acpi_hw_low_set_gpe(gpe_event_info, ACPI_GPE_DISABLE);
 286                 break;
 287
 288         default:
 289                 status = AE_BAD_PARAMETER;
 290                 break;
 291         }
 292
 293       unlock_and_exit:
 294         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 295         return_ACPI_STATUS(status);
 296 }
 297
 298 ACPI_EXPORT_SYMBOL(acpi_set_gpe)
 299
 300 /*******************************************************************************
 301  *
 302  * FUNCTION:    acpi_enable_gpe
 303  *
 304  * PARAMETERS:  gpe_device      - Parent GPE Device. NULL for GPE0/GPE1
 305  *              gpe_number      - GPE level within the GPE block
 306  *              gpe_type        - ACPI_GPE_TYPE_RUNTIME or ACPI_GPE_TYPE_WAKE
 307  *                                or both
 308  *
 309  * RETURN:      Status
 310  *
 311  * DESCRIPTION: Add a reference to a GPE. On the first reference, the GPE is
 312  *              hardware-enabled (for runtime GPEs), or the GPE register mask
 313  *              is updated (for wake GPEs).
 314  *
 315  ******************************************************************************/
 316 acpi_status acpi_enable_gpe(acpi_handle gpe_device, u32 gpe_number, u8 gpe_type)
 317 {
 318         acpi_status status = AE_OK;
 319         struct acpi_gpe_event_info *gpe_event_info;
 320         acpi_cpu_flags flags;
 321
 322         ACPI_FUNCTION_TRACE(acpi_enable_gpe);
 323
 324         /* Parameter validation */
 325
 326         if (!gpe_type || (gpe_type & ~ACPI_GPE_TYPE_WAKE_RUN)) {
 327                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 328         }
 329
 330         flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
 331
 332         /* Ensure that we have a valid GPE number */
 333
 334         gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
 335         if (!gpe_event_info) {
 336                 status = AE_BAD_PARAMETER;
 337                 goto unlock_and_exit;
 338         }
 339
 340         if (gpe_type & ACPI_GPE_TYPE_RUNTIME) {
 341                 if (gpe_event_info->runtime_count == ACPI_UINT8_MAX) {
 342                         status = AE_LIMIT;      /* Too many references */
 343                         goto unlock_and_exit;
 344                 }
 345
 346                 gpe_event_info->runtime_count++;
 347                 if (gpe_event_info->runtime_count == 1) {
 348                         status = acpi_ev_update_gpe_enable_masks(gpe_event_info);
 349                         if (ACPI_SUCCESS(status)) {
 350                                 status = acpi_clear_and_enable_gpe(gpe_event_info);
 351                         }
 352
 353                         if (ACPI_FAILURE(status)) {
 354                                 gpe_event_info->runtime_count--;
 355                                 goto unlock_and_exit;
 356                         }
 357                 }
 358         }
 359
 360         if (gpe_type & ACPI_GPE_TYPE_WAKE) {
 361                 /* The GPE must have the ability to wake the system */
 362
 363                 if (!(gpe_event_info->flags & ACPI_GPE_CAN_WAKE)) {
 364                         status = AE_TYPE;
 365                         goto unlock_and_exit;
 366                 }
 367
 368                 if (gpe_event_info->wakeup_count == ACPI_UINT8_MAX) {
 369                         status = AE_LIMIT;      /* Too many references */
 370                         goto unlock_and_exit;
 371                 }
 372
 373                 /*
 374                  * Update the enable mask on the first wakeup reference. Wake GPEs
 375                  * are only hardware-enabled just before sleeping.
 376                  */
 377                 gpe_event_info->wakeup_count++;
 378                 if (gpe_event_info->wakeup_count == 1) {
 379                         status = acpi_ev_update_gpe_enable_masks(gpe_event_info);
 380                 }
 381         }
 382
 383 unlock_and_exit:
 384         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 385         return_ACPI_STATUS(status);
 386 }
 387 ACPI_EXPORT_SYMBOL(acpi_enable_gpe)
 388
 389 /*******************************************************************************
 390  *
 391  * FUNCTION:    acpi_disable_gpe
 392  *
 393  * PARAMETERS:  gpe_device      - Parent GPE Device. NULL for GPE0/GPE1
 394  *              gpe_number      - GPE level within the GPE block
 395  *              gpe_type        - ACPI_GPE_TYPE_RUNTIME or ACPI_GPE_TYPE_WAKE
 396  *                                or both
 397  *
 398  * RETURN:      Status
 399  *
 400  * DESCRIPTION: Remove a reference to a GPE. When the last reference is
 401  *              removed, only then is the GPE disabled (for runtime GPEs), or
 402  *              the GPE mask bit disabled (for wake GPEs)
 403  *
 404  ******************************************************************************/
 405 acpi_status acpi_disable_gpe(acpi_handle gpe_device, u32 gpe_number, u8 gpe_type)
 406 {
 407         acpi_status status = AE_OK;
 408         struct acpi_gpe_event_info *gpe_event_info;
 409         acpi_cpu_flags flags;
 410
 411         ACPI_FUNCTION_TRACE(acpi_disable_gpe);
 412
 413         /* Parameter validation */
 414
 415         if (!gpe_type || (gpe_type & ~ACPI_GPE_TYPE_WAKE_RUN)) {
 416                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 417         }
 418
 419         flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
 420
 421         /* Ensure that we have a valid GPE number */
 422
 423         gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
 424         if (!gpe_event_info) {
 425                 status = AE_BAD_PARAMETER;
 426                 goto unlock_and_exit;
 427         }
 428
 429         /* Hardware-disable a runtime GPE on removal of the last reference */
 430
 431         if (gpe_type & ACPI_GPE_TYPE_RUNTIME) {
 432                 if (!gpe_event_info->runtime_count) {
 433                         status = AE_LIMIT;      /* There are no references to remove */
 434                         goto unlock_and_exit;
 435                 }
 436
 437                 gpe_event_info->runtime_count--;
 438                 if (!gpe_event_info->runtime_count) {
 439                         status = acpi_ev_update_gpe_enable_masks(gpe_event_info);
 440                         if (ACPI_SUCCESS(status)) {
 441                                 status = acpi_hw_low_set_gpe(gpe_event_info,
 442                                                              ACPI_GPE_DISABLE);
 443                         }
 444
 445                         if (ACPI_FAILURE(status)) {
 446                                 gpe_event_info->runtime_count++;
 447                                 goto unlock_and_exit;
 448                         }
 449                 }
 450         }
 451
 452         /*
 453          * Update masks for wake GPE on removal of the last reference.
 454          * No need to hardware-disable wake GPEs here, they are not currently
 455          * enabled.
 456          */
 457         if (gpe_type & ACPI_GPE_TYPE_WAKE) {
 458                 if (!gpe_event_info->wakeup_count) {
 459                         status = AE_LIMIT;      /* There are no references to remove */
 460                         goto unlock_and_exit;
 461                 }
 462
 463                 gpe_event_info->wakeup_count--;
 464                 if (!gpe_event_info->wakeup_count) {
 465                         status = acpi_ev_update_gpe_enable_masks(gpe_event_info);
 466                 }
 467         }
 468
 469 unlock_and_exit:
 470         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 471         return_ACPI_STATUS(status);
 472 }
 473 ACPI_EXPORT_SYMBOL(acpi_disable_gpe)
 474
 475 /*******************************************************************************
 476  *
 477  * FUNCTION:    acpi_disable_event
 478  *
 479  * PARAMETERS:  Event           - The fixed eventto be enabled
 480  *              Flags           - Reserved
 481  *
 482  * RETURN:      Status
 483  *
 484  * DESCRIPTION: Disable an ACPI event (fixed)
 485  *
 486  ******************************************************************************/
 487 acpi_status acpi_disable_event(u32 event, u32 flags)
 488 {
 489         acpi_status status = AE_OK;
 490         u32 value;
 491
 492         ACPI_FUNCTION_TRACE(acpi_disable_event);
 493
 494         /* Decode the Fixed Event */
 495
 496         if (event > ACPI_EVENT_MAX) {
 497                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 498         }
 499
 500         /*
 501          * Disable the requested fixed event (by writing a zero to the enable
 502          * register bit)
 503          */
 504         status =
 505             acpi_write_bit_register(acpi_gbl_fixed_event_info[event].
 506                                     enable_register_id, ACPI_DISABLE_EVENT);
 507         if (ACPI_FAILURE(status)) {
 508                 return_ACPI_STATUS(status);
 509         }
 510
 511         status =
 512             acpi_read_bit_register(acpi_gbl_fixed_event_info[event].
 513                                    enable_register_id, &value);
 514         if (ACPI_FAILURE(status)) {
 515                 return_ACPI_STATUS(status);
 516         }
 517
 518         if (value != 0) {
 519                 ACPI_ERROR((AE_INFO,
 520                             "Could not disable %s events",
 521                             acpi_ut_get_event_name(event)));
 522                 return_ACPI_STATUS(AE_NO_HARDWARE_RESPONSE);
 523         }
 524
 525         return_ACPI_STATUS(status);
 526 }
 527
 528 ACPI_EXPORT_SYMBOL(acpi_disable_event)
 529
 530 /*******************************************************************************
 531  *
 532  * FUNCTION:    acpi_clear_event
 533  *
 534  * PARAMETERS:  Event           - The fixed event to be cleared
 535  *
 536  * RETURN:      Status
 537  *
 538  * DESCRIPTION: Clear an ACPI event (fixed)
 539  *
 540  ******************************************************************************/
 541 acpi_status acpi_clear_event(u32 event)
 542 {
 543         acpi_status status = AE_OK;
 544
 545         ACPI_FUNCTION_TRACE(acpi_clear_event);
 546
 547         /* Decode the Fixed Event */
 548
 549         if (event > ACPI_EVENT_MAX) {
 550                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 551         }
 552
 553         /*
 554          * Clear the requested fixed event (By writing a one to the status
 555          * register bit)
 556          */
 557         status =
 558             acpi_write_bit_register(acpi_gbl_fixed_event_info[event].
 559                                     status_register_id, ACPI_CLEAR_STATUS);
 560
 561         return_ACPI_STATUS(status);
 562 }
 563
 564 ACPI_EXPORT_SYMBOL(acpi_clear_event)
 565
 566 /*******************************************************************************
 567  *
 568  * FUNCTION:    acpi_clear_gpe
 569  *
 570  * PARAMETERS:  gpe_device      - Parent GPE Device. NULL for GPE0/GPE1
 571  *              gpe_number      - GPE level within the GPE block
 572  *
 573  * RETURN:      Status
 574  *
 575  * DESCRIPTION: Clear an ACPI event (general purpose)
 576  *
 577  ******************************************************************************/
 578 acpi_status acpi_clear_gpe(acpi_handle gpe_device, u32 gpe_number)
 579 {
 580         acpi_status status = AE_OK;
 581         struct acpi_gpe_event_info *gpe_event_info;
 582         acpi_cpu_flags flags;
 583
 584         ACPI_FUNCTION_TRACE(acpi_clear_gpe);
 585
 586         flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
 587
 588         /* Ensure that we have a valid GPE number */
 589
 590         gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
 591         if (!gpe_event_info) {
 592                 status = AE_BAD_PARAMETER;
 593                 goto unlock_and_exit;
 594         }
 595
 596         status = acpi_hw_clear_gpe(gpe_event_info);
 597
 598       unlock_and_exit:
 599         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 600         return_ACPI_STATUS(status);
 601 }
 602
 603 ACPI_EXPORT_SYMBOL(acpi_clear_gpe)
 604 /*******************************************************************************
 605  *
 606  * FUNCTION:    acpi_get_event_status
 607  *
 608  * PARAMETERS:  Event           - The fixed event
 609  *              event_status    - Where the current status of the event will
 610  *                                be returned
 611  *
 612  * RETURN:      Status
 613  *
 614  * DESCRIPTION: Obtains and returns the current status of the event
 615  *
 616  ******************************************************************************/
 617 acpi_status acpi_get_event_status(u32 event, acpi_event_status * event_status)
 618 {
 619         acpi_status status = AE_OK;
 620         u32 value;
 621
 622         ACPI_FUNCTION_TRACE(acpi_get_event_status);
 623
 624         if (!event_status) {
 625                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 626         }
 627
 628         /* Decode the Fixed Event */
 629
 630         if (event > ACPI_EVENT_MAX) {
 631                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 632         }
 633
 634         /* Get the status of the requested fixed event */
 635
 636         status =
 637             acpi_read_bit_register(acpi_gbl_fixed_event_info[event].
 638                               enable_register_id, &value);
 639         if (ACPI_FAILURE(status))
 640                 return_ACPI_STATUS(status);
 641
 642         *event_status = value;
 643
 644         status =
 645             acpi_read_bit_register(acpi_gbl_fixed_event_info[event].
 646                               status_register_id, &value);
 647         if (ACPI_FAILURE(status))
 648                 return_ACPI_STATUS(status);
 649
 650         if (value)
 651                 *event_status |= ACPI_EVENT_FLAG_SET;
 652
 653         if (acpi_gbl_fixed_event_handlers[event].handler)
 654                 *event_status |= ACPI_EVENT_FLAG_HANDLE;
 655
 656         return_ACPI_STATUS(status);
 657 }
 658
 659 ACPI_EXPORT_SYMBOL(acpi_get_event_status)
 660
 661 /*******************************************************************************
 662  *
 663  * FUNCTION:    acpi_get_gpe_status
 664  *
 665  * PARAMETERS:  gpe_device      - Parent GPE Device. NULL for GPE0/GPE1
 666  *              gpe_number      - GPE level within the GPE block
 667  *              event_status    - Where the current status of the event will
 668  *                                be returned
 669  *
 670  * RETURN:      Status
 671  *
 672  * DESCRIPTION: Get status of an event (general purpose)
 673  *
 674  ******************************************************************************/
 675 acpi_status
 676 acpi_get_gpe_status(acpi_handle gpe_device,
 677                     u32 gpe_number, acpi_event_status *event_status)
 678 {
 679         acpi_status status = AE_OK;
 680         struct acpi_gpe_event_info *gpe_event_info;
 681         acpi_cpu_flags flags;
 682
 683         ACPI_FUNCTION_TRACE(acpi_get_gpe_status);
 684
 685         flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
 686
 687         /* Ensure that we have a valid GPE number */
 688
 689         gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
 690         if (!gpe_event_info) {
 691                 status = AE_BAD_PARAMETER;
 692                 goto unlock_and_exit;
 693         }
 694
 695         /* Obtain status on the requested GPE number */
 696
 697         status = acpi_hw_get_gpe_status(gpe_event_info, event_status);
 698
 699         if (gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK)
 700                 *event_status |= ACPI_EVENT_FLAG_HANDLE;
 701
 702       unlock_and_exit:
 703         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 704         return_ACPI_STATUS(status);
 705 }
 706
 707 ACPI_EXPORT_SYMBOL(acpi_get_gpe_status)
 708 /*******************************************************************************
 709  *
 710  * FUNCTION:    acpi_install_gpe_block
 711  *
 712  * PARAMETERS:  gpe_device          - Handle to the parent GPE Block Device
 713  *              gpe_block_address   - Address and space_iD
 714  *              register_count      - Number of GPE register pairs in the block
 715  *              interrupt_number    - H/W interrupt for the block
 716  *
 717  * RETURN:      Status
 718  *
 719  * DESCRIPTION: Create and Install a block of GPE registers
 720  *
 721  ******************************************************************************/
 722 acpi_status
 723 acpi_install_gpe_block(acpi_handle gpe_device,
 724                        struct acpi_generic_address *gpe_block_address,
 725                        u32 register_count, u32 interrupt_number)
 726 {
 727         acpi_status status;
 728         union acpi_operand_object *obj_desc;
 729         struct acpi_namespace_node *node;
 730         struct acpi_gpe_block_info *gpe_block;
 731
 732         ACPI_FUNCTION_TRACE(acpi_install_gpe_block);
 733
 734         if ((!gpe_device) || (!gpe_block_address) || (!register_count)) {
 735                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 736         }
 737
 738         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
 739         if (ACPI_FAILURE(status)) {
 740                 return (status);
 741         }
 742
 743         node = acpi_ns_validate_handle(gpe_device);
 744         if (!node) {
 745                 status = AE_BAD_PARAMETER;
 746                 goto unlock_and_exit;
 747         }
 748
 749         /*
 750          * For user-installed GPE Block Devices, the gpe_block_base_number
 751          * is always zero
 752          */
 753         status =
 754             acpi_ev_create_gpe_block(node, gpe_block_address, register_count, 0,
 755                                      interrupt_number, &gpe_block);
 756         if (ACPI_FAILURE(status)) {
 757                 goto unlock_and_exit;
 758         }
 759
 760         /* Install block in the device_object attached to the node */
 761
 762         obj_desc = acpi_ns_get_attached_object(node);
 763         if (!obj_desc) {
 764
 765                 /*
 766                  * No object, create a new one (Device nodes do not always have
 767                  * an attached object)
 768                  */
 769                 obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_DEVICE);
 770                 if (!obj_desc) {
 771                         status = AE_NO_MEMORY;
 772                         goto unlock_and_exit;
 773                 }
 774
 775                 status =
 776                     acpi_ns_attach_object(node, obj_desc, ACPI_TYPE_DEVICE);
 777
 778                 /* Remove local reference to the object */
 779
 780                 acpi_ut_remove_reference(obj_desc);
 781
 782                 if (ACPI_FAILURE(status)) {
 783                         goto unlock_and_exit;
 784                 }
 785         }
 786
 787         /* Now install the GPE block in the device_object */
 788
 789         obj_desc->device.gpe_block = gpe_block;
 790
 791         /* Run the _PRW methods and enable the runtime GPEs in the new block */
 792
 793         status = acpi_ev_initialize_gpe_block(node, gpe_block);
 794
 795       unlock_and_exit:
 796         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 797         return_ACPI_STATUS(status);
 798 }
 799
 800 ACPI_EXPORT_SYMBOL(acpi_install_gpe_block)
 801
 802 /*******************************************************************************
 803  *
 804  * FUNCTION:    acpi_remove_gpe_block
 805  *
 806  * PARAMETERS:  gpe_device          - Handle to the parent GPE Block Device
 807  *
 808  * RETURN:      Status
 809  *
 810  * DESCRIPTION: Remove a previously installed block of GPE registers
 811  *
 812  ******************************************************************************/
 813 acpi_status acpi_remove_gpe_block(acpi_handle gpe_device)
 814 {
 815         union acpi_operand_object *obj_desc;
 816         acpi_status status;
 817         struct acpi_namespace_node *node;
 818
 819         ACPI_FUNCTION_TRACE(acpi_remove_gpe_block);
 820
 821         if (!gpe_device) {
 822                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 823         }
 824
 825         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
 826         if (ACPI_FAILURE(status)) {
 827                 return (status);
 828         }
 829
 830         node = acpi_ns_validate_handle(gpe_device);
 831         if (!node) {
 832                 status = AE_BAD_PARAMETER;
 833                 goto unlock_and_exit;
 834         }
 835
 836         /* Get the device_object attached to the node */
 837
 838         obj_desc = acpi_ns_get_attached_object(node);
 839         if (!obj_desc || !obj_desc->device.gpe_block) {
 840                 return_ACPI_STATUS(AE_NULL_OBJECT);
 841         }
 842
 843         /* Delete the GPE block (but not the device_object) */
 844
 845         status = acpi_ev_delete_gpe_block(obj_desc->device.gpe_block);
 846         if (ACPI_SUCCESS(status)) {
 847                 obj_desc->device.gpe_block = NULL;
 848         }
 849
 850       unlock_and_exit:
 851         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 852         return_ACPI_STATUS(status);
 853 }
 854
 855 ACPI_EXPORT_SYMBOL(acpi_remove_gpe_block)
 856
 857 /*******************************************************************************
 858  *
 859  * FUNCTION:    acpi_get_gpe_device
 860  *
 861  * PARAMETERS:  Index               - System GPE index (0-current_gpe_count)
 862  *              gpe_device          - Where the parent GPE Device is returned
 863  *
 864  * RETURN:      Status
 865  *
 866  * DESCRIPTION: Obtain the GPE device associated with the input index. A NULL
 867  *              gpe device indicates that the gpe number is contained in one of
 868  *              the FADT-defined gpe blocks. Otherwise, the GPE block device.
 869  *
 870  ******************************************************************************/
 871 acpi_status
 872 acpi_get_gpe_device(u32 index, acpi_handle *gpe_device)
 873 {
 874         struct acpi_gpe_device_info info;
 875         acpi_status status;
 876
 877         ACPI_FUNCTION_TRACE(acpi_get_gpe_device);
 878
 879         if (!gpe_device) {
 880                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 881         }
 882
 883         if (index >= acpi_current_gpe_count) {
 884                 return_ACPI_STATUS(AE_NOT_EXIST);
 885         }
 886
 887         /* Setup and walk the GPE list */
 888
 889         info.index = index;
 890         info.status = AE_NOT_EXIST;
 891         info.gpe_device = NULL;
 892         info.next_block_base_index = 0;
 893
 894         status = acpi_ev_walk_gpe_list(acpi_ev_get_gpe_device, &info);
 895         if (ACPI_FAILURE(status)) {
 896                 return_ACPI_STATUS(status);
 897         }
 898
 899         *gpe_device = info.gpe_device;
 900         return_ACPI_STATUS(info.status);
 901 }
 902
 903 ACPI_EXPORT_SYMBOL(acpi_get_gpe_device)
 904
 905 /*******************************************************************************
 906  *
 907  * FUNCTION:    acpi_ev_get_gpe_device
 908  *
 909  * PARAMETERS:  GPE_WALK_CALLBACK
 910  *
 911  * RETURN:      Status
 912  *
 913  * DESCRIPTION: Matches the input GPE index (0-current_gpe_count) with a GPE
 914  *              block device. NULL if the GPE is one of the FADT-defined GPEs.
 915  *
 916  ******************************************************************************/
 917 static acpi_status
 918 acpi_ev_get_gpe_device(struct acpi_gpe_xrupt_info *gpe_xrupt_info,
 919                        struct acpi_gpe_block_info *gpe_block, void *context)
 920 {
 921         struct acpi_gpe_device_info *info = context;
 922
 923         /* Increment Index by the number of GPEs in this block */
 924
 925         info->next_block_base_index += gpe_block->gpe_count;
 926
 927         if (info->index < info->next_block_base_index) {
 928                 /*
 929                  * The GPE index is within this block, get the node. Leave the node
 930                  * NULL for the FADT-defined GPEs
 931                  */
 932                 if ((gpe_block->node)->type == ACPI_TYPE_DEVICE) {
 933                         info->gpe_device = gpe_block->node;
 934                 }
 935
 936                 info->status = AE_OK;
 937                 return (AE_CTRL_END);
 938         }
 939
 940         return (AE_OK);
 941 }
 942
 943 /******************************************************************************
 944  *
 945  * FUNCTION:    acpi_disable_all_gpes
 946  *
 947  * PARAMETERS:  None
 948  *
 949  * RETURN:      Status
 950  *
 951  * DESCRIPTION: Disable and clear all GPEs in all GPE blocks
 952  *
 953  ******************************************************************************/
 954
 955 acpi_status acpi_disable_all_gpes(void)
 956 {
 957         acpi_status status;
 958
 959         ACPI_FUNCTION_TRACE(acpi_disable_all_gpes);
 960
 961         status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
 962         if (ACPI_FAILURE(status)) {
 963                 return_ACPI_STATUS(status);
 964         }
 965
 966         status = acpi_hw_disable_all_gpes();
 967         (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
 968
 969         return_ACPI_STATUS(status);
 970 }
 971
 972 /******************************************************************************
 973  *
 974  * FUNCTION:    acpi_enable_all_runtime_gpes
 975  *
 976  * PARAMETERS:  None
 977  *
 978  * RETURN:      Status
 979  *
 980  * DESCRIPTION: Enable all "runtime" GPEs, in all GPE blocks
 981  *
 982  ******************************************************************************/
 983
 984 acpi_status acpi_enable_all_runtime_gpes(void)
 985 {
 986         acpi_status status;
 987
 988         ACPI_FUNCTION_TRACE(acpi_enable_all_runtime_gpes);
 989
 990         status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
 991         if (ACPI_FAILURE(status)) {
 992                 return_ACPI_STATUS(status);
 993         }
 994
 995         status = acpi_hw_enable_all_runtime_gpes();
 996         (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
 997
 998         return_ACPI_STATUS(status);
 999 }