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