drivers/acpi/events/evgpe.c

   1 /******************************************************************************
   2  *
   3  * Module Name: evgpe - General Purpose Event handling and dispatch
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2006, R. Byron Moore
   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 <acpi/acevents.h>
  46 #include <acpi/acnamesp.h>
  47
  48 #define _COMPONENT          ACPI_EVENTS
  49 ACPI_MODULE_NAME("evgpe")
  50
  51 /* Local prototypes */
  52 static void ACPI_SYSTEM_XFACE acpi_ev_asynch_execute_gpe_method(void *context);
  53
  54 /*******************************************************************************
  55  *
  56  * FUNCTION:    acpi_ev_set_gpe_type
  57  *
  58  * PARAMETERS:  gpe_event_info          - GPE to set
  59  *              Type                    - New type
  60  *
  61  * RETURN:      Status
  62  *
  63  * DESCRIPTION: Sets the new type for the GPE (wake, run, or wake/run)
  64  *
  65  ******************************************************************************/
  66
  67 acpi_status
  68 acpi_ev_set_gpe_type(struct acpi_gpe_event_info *gpe_event_info, u8 type)
  69 {
  70         acpi_status status;
  71
  72         ACPI_FUNCTION_TRACE(ev_set_gpe_type);
  73
  74         /* Validate type and update register enable masks */
  75
  76         switch (type) {
  77         case ACPI_GPE_TYPE_WAKE:
  78         case ACPI_GPE_TYPE_RUNTIME:
  79         case ACPI_GPE_TYPE_WAKE_RUN:
  80                 break;
  81
  82         default:
  83                 return_ACPI_STATUS(AE_BAD_PARAMETER);
  84         }
  85
  86         /* Disable the GPE if currently enabled */
  87
  88         status = acpi_ev_disable_gpe(gpe_event_info);
  89
  90         /* Type was validated above */
  91
  92         gpe_event_info->flags &= ~ACPI_GPE_TYPE_MASK;   /* Clear type bits */
  93         gpe_event_info->flags |= type;  /* Insert type */
  94         return_ACPI_STATUS(status);
  95 }
  96
  97 /*******************************************************************************
  98  *
  99  * FUNCTION:    acpi_ev_update_gpe_enable_masks
 100  *
 101  * PARAMETERS:  gpe_event_info          - GPE to update
 102  *              Type                    - What to do: ACPI_GPE_DISABLE or
 103  *                                        ACPI_GPE_ENABLE
 104  *
 105  * RETURN:      Status
 106  *
 107  * DESCRIPTION: Updates GPE register enable masks based on the GPE type
 108  *
 109  ******************************************************************************/
 110
 111 acpi_status
 112 acpi_ev_update_gpe_enable_masks(struct acpi_gpe_event_info *gpe_event_info,
 113                                 u8 type)
 114 {
 115         struct acpi_gpe_register_info *gpe_register_info;
 116         u8 register_bit;
 117
 118         ACPI_FUNCTION_TRACE(ev_update_gpe_enable_masks);
 119
 120         gpe_register_info = gpe_event_info->register_info;
 121         if (!gpe_register_info) {
 122                 return_ACPI_STATUS(AE_NOT_EXIST);
 123         }
 124         register_bit = gpe_event_info->register_bit;
 125
 126         /* 1) Disable case.  Simply clear all enable bits */
 127
 128         if (type == ACPI_GPE_DISABLE) {
 129                 ACPI_CLEAR_BIT(gpe_register_info->enable_for_wake,
 130                                register_bit);
 131                 ACPI_CLEAR_BIT(gpe_register_info->enable_for_run, register_bit);
 132                 return_ACPI_STATUS(AE_OK);
 133         }
 134
 135         /* 2) Enable case.  Set/Clear the appropriate enable bits */
 136
 137         switch (gpe_event_info->flags & ACPI_GPE_TYPE_MASK) {
 138         case ACPI_GPE_TYPE_WAKE:
 139                 ACPI_SET_BIT(gpe_register_info->enable_for_wake, register_bit);
 140                 ACPI_CLEAR_BIT(gpe_register_info->enable_for_run, register_bit);
 141                 break;
 142
 143         case ACPI_GPE_TYPE_RUNTIME:
 144                 ACPI_CLEAR_BIT(gpe_register_info->enable_for_wake,
 145                                register_bit);
 146                 ACPI_SET_BIT(gpe_register_info->enable_for_run, register_bit);
 147                 break;
 148
 149         case ACPI_GPE_TYPE_WAKE_RUN:
 150                 ACPI_SET_BIT(gpe_register_info->enable_for_wake, register_bit);
 151                 ACPI_SET_BIT(gpe_register_info->enable_for_run, register_bit);
 152                 break;
 153
 154         default:
 155                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 156         }
 157
 158         return_ACPI_STATUS(AE_OK);
 159 }
 160
 161 /*******************************************************************************
 162  *
 163  * FUNCTION:    acpi_ev_enable_gpe
 164  *
 165  * PARAMETERS:  gpe_event_info          - GPE to enable
 166  *              write_to_hardware       - Enable now, or just mark data structs
 167  *                                        (WAKE GPEs should be deferred)
 168  *
 169  * RETURN:      Status
 170  *
 171  * DESCRIPTION: Enable a GPE based on the GPE type
 172  *
 173  ******************************************************************************/
 174
 175 acpi_status
 176 acpi_ev_enable_gpe(struct acpi_gpe_event_info *gpe_event_info,
 177                    u8 write_to_hardware)
 178 {
 179         acpi_status status;
 180
 181         ACPI_FUNCTION_TRACE(ev_enable_gpe);
 182
 183         /* Make sure HW enable masks are updated */
 184
 185         status =
 186             acpi_ev_update_gpe_enable_masks(gpe_event_info, ACPI_GPE_ENABLE);
 187         if (ACPI_FAILURE(status)) {
 188                 return_ACPI_STATUS(status);
 189         }
 190
 191         /* Mark wake-enabled or HW enable, or both */
 192
 193         switch (gpe_event_info->flags & ACPI_GPE_TYPE_MASK) {
 194         case ACPI_GPE_TYPE_WAKE:
 195
 196                 ACPI_SET_BIT(gpe_event_info->flags, ACPI_GPE_WAKE_ENABLED);
 197                 break;
 198
 199         case ACPI_GPE_TYPE_WAKE_RUN:
 200
 201                 ACPI_SET_BIT(gpe_event_info->flags, ACPI_GPE_WAKE_ENABLED);
 202
 203                 /*lint -fallthrough */
 204
 205         case ACPI_GPE_TYPE_RUNTIME:
 206
 207                 ACPI_SET_BIT(gpe_event_info->flags, ACPI_GPE_RUN_ENABLED);
 208
 209                 if (write_to_hardware) {
 210
 211                         /* Clear the GPE (of stale events), then enable it */
 212
 213                         status = acpi_hw_clear_gpe(gpe_event_info);
 214                         if (ACPI_FAILURE(status)) {
 215                                 return_ACPI_STATUS(status);
 216                         }
 217
 218                         /* Enable the requested runtime GPE */
 219
 220                         status = acpi_hw_write_gpe_enable_reg(gpe_event_info);
 221                 }
 222                 break;
 223
 224         default:
 225                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 226         }
 227
 228         return_ACPI_STATUS(AE_OK);
 229 }
 230
 231 /*******************************************************************************
 232  *
 233  * FUNCTION:    acpi_ev_disable_gpe
 234  *
 235  * PARAMETERS:  gpe_event_info          - GPE to disable
 236  *
 237  * RETURN:      Status
 238  *
 239  * DESCRIPTION: Disable a GPE based on the GPE type
 240  *
 241  ******************************************************************************/
 242
 243 acpi_status acpi_ev_disable_gpe(struct acpi_gpe_event_info *gpe_event_info)
 244 {
 245         acpi_status status;
 246
 247         ACPI_FUNCTION_TRACE(ev_disable_gpe);
 248
 249         if (!(gpe_event_info->flags & ACPI_GPE_ENABLE_MASK)) {
 250                 return_ACPI_STATUS(AE_OK);
 251         }
 252
 253         /* Make sure HW enable masks are updated */
 254
 255         status =
 256             acpi_ev_update_gpe_enable_masks(gpe_event_info, ACPI_GPE_DISABLE);
 257         if (ACPI_FAILURE(status)) {
 258                 return_ACPI_STATUS(status);
 259         }
 260
 261         /* Mark wake-disabled or HW disable, or both */
 262
 263         switch (gpe_event_info->flags & ACPI_GPE_TYPE_MASK) {
 264         case ACPI_GPE_TYPE_WAKE:
 265                 ACPI_CLEAR_BIT(gpe_event_info->flags, ACPI_GPE_WAKE_ENABLED);
 266                 break;
 267
 268         case ACPI_GPE_TYPE_WAKE_RUN:
 269                 ACPI_CLEAR_BIT(gpe_event_info->flags, ACPI_GPE_WAKE_ENABLED);
 270
 271                 /*lint -fallthrough */
 272
 273         case ACPI_GPE_TYPE_RUNTIME:
 274
 275                 /* Disable the requested runtime GPE */
 276
 277                 ACPI_CLEAR_BIT(gpe_event_info->flags, ACPI_GPE_RUN_ENABLED);
 278                 status = acpi_hw_write_gpe_enable_reg(gpe_event_info);
 279                 break;
 280
 281         default:
 282                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 283         }
 284
 285         return_ACPI_STATUS(AE_OK);
 286 }
 287
 288 /*******************************************************************************
 289  *
 290  * FUNCTION:    acpi_ev_get_gpe_event_info
 291  *
 292  * PARAMETERS:  gpe_device          - Device node.  NULL for GPE0/GPE1
 293  *              gpe_number          - Raw GPE number
 294  *
 295  * RETURN:      A GPE event_info struct. NULL if not a valid GPE
 296  *
 297  * DESCRIPTION: Returns the event_info struct associated with this GPE.
 298  *              Validates the gpe_block and the gpe_number
 299  *
 300  *              Should be called only when the GPE lists are semaphore locked
 301  *              and not subject to change.
 302  *
 303  ******************************************************************************/
 304
 305 struct acpi_gpe_event_info *acpi_ev_get_gpe_event_info(acpi_handle gpe_device,
 306                                                        u32 gpe_number)
 307 {
 308         union acpi_operand_object *obj_desc;
 309         struct acpi_gpe_block_info *gpe_block;
 310         acpi_native_uint i;
 311
 312         ACPI_FUNCTION_ENTRY();
 313
 314         /* A NULL gpe_block means use the FADT-defined GPE block(s) */
 315
 316         if (!gpe_device) {
 317
 318                 /* Examine GPE Block 0 and 1 (These blocks are permanent) */
 319
 320                 for (i = 0; i < ACPI_MAX_GPE_BLOCKS; i++) {
 321                         gpe_block = acpi_gbl_gpe_fadt_blocks[i];
 322                         if (gpe_block) {
 323                                 if ((gpe_number >= gpe_block->block_base_number)
 324                                     && (gpe_number <
 325                                         gpe_block->block_base_number +
 326                                         (gpe_block->register_count * 8))) {
 327                                         return (&gpe_block->
 328                                                 event_info[gpe_number -
 329                                                            gpe_block->
 330                                                            block_base_number]);
 331                                 }
 332                         }
 333                 }
 334
 335                 /* The gpe_number was not in the range of either FADT GPE block */
 336
 337                 return (NULL);
 338         }
 339
 340         /* A Non-NULL gpe_device means this is a GPE Block Device */
 341
 342         obj_desc =
 343             acpi_ns_get_attached_object((struct acpi_namespace_node *)
 344                                         gpe_device);
 345         if (!obj_desc || !obj_desc->device.gpe_block) {
 346                 return (NULL);
 347         }
 348
 349         gpe_block = obj_desc->device.gpe_block;
 350
 351         if ((gpe_number >= gpe_block->block_base_number) &&
 352             (gpe_number <
 353              gpe_block->block_base_number + (gpe_block->register_count * 8))) {
 354                 return (&gpe_block->
 355                         event_info[gpe_number - gpe_block->block_base_number]);
 356         }
 357
 358         return (NULL);
 359 }
 360
 361 /*******************************************************************************
 362  *
 363  * FUNCTION:    acpi_ev_gpe_detect
 364  *
 365  * PARAMETERS:  gpe_xrupt_list      - Interrupt block for this interrupt.
 366  *                                    Can have multiple GPE blocks attached.
 367  *
 368  * RETURN:      INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED
 369  *
 370  * DESCRIPTION: Detect if any GP events have occurred.  This function is
 371  *              executed at interrupt level.
 372  *
 373  ******************************************************************************/
 374
 375 u32 acpi_ev_gpe_detect(struct acpi_gpe_xrupt_info * gpe_xrupt_list)
 376 {
 377         acpi_status status;
 378         struct acpi_gpe_block_info *gpe_block;
 379         struct acpi_gpe_register_info *gpe_register_info;
 380         u32 int_status = ACPI_INTERRUPT_NOT_HANDLED;
 381         u8 enabled_status_byte;
 382         u32 status_reg;
 383         u32 enable_reg;
 384         acpi_cpu_flags flags;
 385         acpi_native_uint i;
 386         acpi_native_uint j;
 387
 388         ACPI_FUNCTION_NAME(ev_gpe_detect);
 389
 390         /* Check for the case where there are no GPEs */
 391
 392         if (!gpe_xrupt_list) {
 393                 return (int_status);
 394         }
 395
 396         /*
 397          * We need to obtain the GPE lock for both the data structs and registers
 398          * Note: Not necessary to obtain the hardware lock, since the GPE registers
 399          * are owned by the gpe_lock.
 400          */
 401         flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
 402
 403         /* Examine all GPE blocks attached to this interrupt level */
 404
 405         gpe_block = gpe_xrupt_list->gpe_block_list_head;
 406         while (gpe_block) {
 407                 /*
 408                  * Read all of the 8-bit GPE status and enable registers
 409                  * in this GPE block, saving all of them.
 410                  * Find all currently active GP events.
 411                  */
 412                 for (i = 0; i < gpe_block->register_count; i++) {
 413
 414                         /* Get the next status/enable pair */
 415
 416                         gpe_register_info = &gpe_block->register_info[i];
 417
 418                         /* Read the Status Register */
 419
 420                         status =
 421                             acpi_hw_low_level_read(ACPI_GPE_REGISTER_WIDTH,
 422                                                    &status_reg,
 423                                                    &gpe_register_info->
 424                                                    status_address);
 425                         if (ACPI_FAILURE(status)) {
 426                                 goto unlock_and_exit;
 427                         }
 428
 429                         /* Read the Enable Register */
 430
 431                         status =
 432                             acpi_hw_low_level_read(ACPI_GPE_REGISTER_WIDTH,
 433                                                    &enable_reg,
 434                                                    &gpe_register_info->
 435                                                    enable_address);
 436                         if (ACPI_FAILURE(status)) {
 437                                 goto unlock_and_exit;
 438                         }
 439
 440                         ACPI_DEBUG_PRINT((ACPI_DB_INTERRUPTS,
 441                                           "Read GPE Register at GPE%X: Status=%02X, Enable=%02X\n",
 442                                           gpe_register_info->base_gpe_number,
 443                                           status_reg, enable_reg));
 444
 445                         /* Check if there is anything active at all in this register */
 446
 447                         enabled_status_byte = (u8) (status_reg & enable_reg);
 448                         if (!enabled_status_byte) {
 449
 450                                 /* No active GPEs in this register, move on */
 451
 452                                 continue;
 453                         }
 454
 455                         /* Now look at the individual GPEs in this byte register */
 456
 457                         for (j = 0; j < ACPI_GPE_REGISTER_WIDTH; j++) {
 458
 459                                 /* Examine one GPE bit */
 460
 461                                 if (enabled_status_byte &
 462                                     acpi_gbl_decode_to8bit[j]) {
 463                                         /*
 464                                          * Found an active GPE. Dispatch the event to a handler
 465                                          * or method.
 466                                          */
 467                                         int_status |=
 468                                             acpi_ev_gpe_dispatch(&gpe_block->
 469                                                                  event_info[(i *
 470                                                                              ACPI_GPE_REGISTER_WIDTH)
 471                                                                             +
 472                                                                             j],
 473                                                                  (u32) j +
 474                                                                  gpe_register_info->
 475                                                                  base_gpe_number);
 476                                 }
 477                         }
 478                 }
 479
 480                 gpe_block = gpe_block->next;
 481         }
 482
 483       unlock_and_exit:
 484
 485         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 486         return (int_status);
 487 }
 488
 489 /*******************************************************************************
 490  *
 491  * FUNCTION:    acpi_ev_asynch_execute_gpe_method
 492  *
 493  * PARAMETERS:  Context (gpe_event_info) - Info for this GPE
 494  *
 495  * RETURN:      None
 496  *
 497  * DESCRIPTION: Perform the actual execution of a GPE control method. This
 498  *              function is called from an invocation of acpi_os_execute and
 499  *              therefore does NOT execute at interrupt level - so that
 500  *              the control method itself is not executed in the context of
 501  *              an interrupt handler.
 502  *
 503  ******************************************************************************/
 504
 505 static void ACPI_SYSTEM_XFACE acpi_ev_asynch_execute_gpe_method(void *context)
 506 {
 507         struct acpi_gpe_event_info *gpe_event_info = (void *)context;
 508         acpi_status status;
 509         struct acpi_gpe_event_info local_gpe_event_info;
 510         struct acpi_evaluate_info *info;
 511
 512         ACPI_FUNCTION_TRACE(ev_asynch_execute_gpe_method);
 513
 514         status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
 515         if (ACPI_FAILURE(status)) {
 516                 return_VOID;
 517         }
 518
 519         /* Must revalidate the gpe_number/gpe_block */
 520
 521         if (!acpi_ev_valid_gpe_event(gpe_event_info)) {
 522                 status = acpi_ut_release_mutex(ACPI_MTX_EVENTS);
 523                 return_VOID;
 524         }
 525
 526         /* Set the GPE flags for return to enabled state */
 527
 528         (void)acpi_ev_enable_gpe(gpe_event_info, FALSE);
 529
 530         /*
 531          * Take a snapshot of the GPE info for this level - we copy the
 532          * info to prevent a race condition with remove_handler/remove_block.
 533          */
 534         ACPI_MEMCPY(&local_gpe_event_info, gpe_event_info,
 535                     sizeof(struct acpi_gpe_event_info));
 536
 537         status = acpi_ut_release_mutex(ACPI_MTX_EVENTS);
 538         if (ACPI_FAILURE(status)) {
 539                 return_VOID;
 540         }
 541
 542         /*
 543          * Must check for control method type dispatch one more
 544          * time to avoid race with ev_gpe_install_handler
 545          */
 546         if ((local_gpe_event_info.flags & ACPI_GPE_DISPATCH_MASK) ==
 547             ACPI_GPE_DISPATCH_METHOD) {
 548
 549                 /* Allocate the evaluation information block */
 550
 551                 info = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info));
 552                 if (!info) {
 553                         status = AE_NO_MEMORY;
 554                 } else {
 555                         /*
 556                          * Invoke the GPE Method (_Lxx, _Exx) i.e., evaluate the _Lxx/_Exx
 557                          * control method that corresponds to this GPE
 558                          */
 559                         info->prefix_node =
 560                             local_gpe_event_info.dispatch.method_node;
 561                         info->parameters =
 562                             ACPI_CAST_PTR(union acpi_operand_object *,
 563                                           gpe_event_info);
 564                         info->parameter_type = ACPI_PARAM_GPE;
 565                         info->flags = ACPI_IGNORE_RETURN_VALUE;
 566
 567                         status = acpi_ns_evaluate(info);
 568                         ACPI_FREE(info);
 569                 }
 570
 571                 if (ACPI_FAILURE(status)) {
 572                         ACPI_EXCEPTION((AE_INFO, status,
 573                                         "While evaluating GPE method [%4.4s]",
 574                                         acpi_ut_get_node_name
 575                                         (local_gpe_event_info.dispatch.
 576                                          method_node)));
 577                 }
 578         }
 579
 580         if ((local_gpe_event_info.flags & ACPI_GPE_XRUPT_TYPE_MASK) ==
 581             ACPI_GPE_LEVEL_TRIGGERED) {
 582                 /*
 583                  * GPE is level-triggered, we clear the GPE status bit after
 584                  * handling the event.
 585                  */
 586                 status = acpi_hw_clear_gpe(&local_gpe_event_info);
 587                 if (ACPI_FAILURE(status)) {
 588                         return_VOID;
 589                 }
 590         }
 591
 592         /* Enable this GPE */
 593
 594         (void)acpi_hw_write_gpe_enable_reg(&local_gpe_event_info);
 595         return_VOID;
 596 }
 597
 598 /*******************************************************************************
 599  *
 600  * FUNCTION:    acpi_ev_gpe_dispatch
 601  *
 602  * PARAMETERS:  gpe_event_info  - Info for this GPE
 603  *              gpe_number      - Number relative to the parent GPE block
 604  *
 605  * RETURN:      INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED
 606  *
 607  * DESCRIPTION: Dispatch a General Purpose Event to either a function (e.g. EC)
 608  *              or method (e.g. _Lxx/_Exx) handler.
 609  *
 610  *              This function executes at interrupt level.
 611  *
 612  ******************************************************************************/
 613
 614 u32
 615 acpi_ev_gpe_dispatch(struct acpi_gpe_event_info *gpe_event_info, u32 gpe_number)
 616 {
 617         acpi_status status;
 618
 619         ACPI_FUNCTION_TRACE(ev_gpe_dispatch);
 620
 621         /*
 622          * If edge-triggered, clear the GPE status bit now.  Note that
 623          * level-triggered events are cleared after the GPE is serviced.
 624          */
 625         if ((gpe_event_info->flags & ACPI_GPE_XRUPT_TYPE_MASK) ==
 626             ACPI_GPE_EDGE_TRIGGERED) {
 627                 status = acpi_hw_clear_gpe(gpe_event_info);
 628                 if (ACPI_FAILURE(status)) {
 629                         ACPI_EXCEPTION((AE_INFO, status,
 630                                         "Unable to clear GPE[%2X]",
 631                                         gpe_number));
 632                         return_UINT32(ACPI_INTERRUPT_NOT_HANDLED);
 633                 }
 634         }
 635
 636         /* Save current system state */
 637
 638         if (acpi_gbl_system_awake_and_running) {
 639                 ACPI_SET_BIT(gpe_event_info->flags, ACPI_GPE_SYSTEM_RUNNING);
 640         } else {
 641                 ACPI_CLEAR_BIT(gpe_event_info->flags, ACPI_GPE_SYSTEM_RUNNING);
 642         }
 643
 644         /*
 645          * Dispatch the GPE to either an installed handler, or the control
 646          * method associated with this GPE (_Lxx or _Exx).
 647          * If a handler exists, we invoke it and do not attempt to run the method.
 648          * If there is neither a handler nor a method, we disable the level to
 649          * prevent further events from coming in here.
 650          */
 651         switch (gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) {
 652         case ACPI_GPE_DISPATCH_HANDLER:
 653
 654                 /*
 655                  * Invoke the installed handler (at interrupt level)
 656                  * Ignore return status for now.  TBD: leave GPE disabled on error?
 657                  */
 658                 (void)gpe_event_info->dispatch.handler->address(gpe_event_info->
 659                                                                 dispatch.
 660                                                                 handler->
 661                                                                 context);
 662
 663                 /* It is now safe to clear level-triggered events. */
 664
 665                 if ((gpe_event_info->flags & ACPI_GPE_XRUPT_TYPE_MASK) ==
 666                     ACPI_GPE_LEVEL_TRIGGERED) {
 667                         status = acpi_hw_clear_gpe(gpe_event_info);
 668                         if (ACPI_FAILURE(status)) {
 669                                 ACPI_EXCEPTION((AE_INFO, status,
 670                                                 "Unable to clear GPE[%2X]",
 671                                                 gpe_number));
 672                                 return_UINT32(ACPI_INTERRUPT_NOT_HANDLED);
 673                         }
 674                 }
 675                 break;
 676
 677         case ACPI_GPE_DISPATCH_METHOD:
 678
 679                 /*
 680                  * Disable GPE, so it doesn't keep firing before the method has a
 681                  * chance to run.
 682                  */
 683                 status = acpi_ev_disable_gpe(gpe_event_info);
 684                 if (ACPI_FAILURE(status)) {
 685                         ACPI_EXCEPTION((AE_INFO, status,
 686                                         "Unable to disable GPE[%2X]",
 687                                         gpe_number));
 688                         return_UINT32(ACPI_INTERRUPT_NOT_HANDLED);
 689                 }
 690
 691                 /*
 692                  * Execute the method associated with the GPE
 693                  * NOTE: Level-triggered GPEs are cleared after the method completes.
 694                  */
 695                 status = acpi_os_execute(OSL_GPE_HANDLER,
 696                                          acpi_ev_asynch_execute_gpe_method,
 697                                          gpe_event_info);
 698                 if (ACPI_FAILURE(status)) {
 699                         ACPI_EXCEPTION((AE_INFO, status,
 700                                         "Unable to queue handler for GPE[%2X] - event disabled",
 701                                         gpe_number));
 702                 }
 703                 break;
 704
 705         default:
 706
 707                 /* No handler or method to run! */
 708
 709                 ACPI_ERROR((AE_INFO,
 710                             "No handler or method for GPE[%2X], disabling event",
 711                             gpe_number));
 712
 713                 /*
 714                  * Disable the GPE.  The GPE will remain disabled until the ACPI
 715                  * Core Subsystem is restarted, or a handler is installed.
 716                  */
 717                 status = acpi_ev_disable_gpe(gpe_event_info);
 718                 if (ACPI_FAILURE(status)) {
 719                         ACPI_EXCEPTION((AE_INFO, status,
 720                                         "Unable to disable GPE[%2X]",
 721                                         gpe_number));
 722                         return_UINT32(ACPI_INTERRUPT_NOT_HANDLED);
 723                 }
 724                 break;
 725         }
 726
 727         return_UINT32(ACPI_INTERRUPT_HANDLED);
 728 }
 729
 730 #ifdef ACPI_GPE_NOTIFY_CHECK
 731 /*******************************************************************************
 732  * TBD: NOT USED, PROTOTYPE ONLY AND WILL PROBABLY BE REMOVED
 733  *
 734  * FUNCTION:    acpi_ev_check_for_wake_only_gpe
 735  *
 736  * PARAMETERS:  gpe_event_info  - info for this GPE
 737  *
 738  * RETURN:      Status
 739  *
 740  * DESCRIPTION: Determine if a a GPE is "wake-only".
 741  *
 742  *              Called from Notify() code in interpreter when a "DeviceWake"
 743  *              Notify comes in.
 744  *
 745  ******************************************************************************/
 746
 747 acpi_status
 748 acpi_ev_check_for_wake_only_gpe(struct acpi_gpe_event_info *gpe_event_info)
 749 {
 750         acpi_status status;
 751
 752         ACPI_FUNCTION_TRACE(ev_check_for_wake_only_gpe);
 753
 754         if ((gpe_event_info) && /* Only >0 for _Lxx/_Exx */
 755             ((gpe_event_info->flags & ACPI_GPE_SYSTEM_MASK) == ACPI_GPE_SYSTEM_RUNNING)) {      /* System state at GPE time */
 756                 /* This must be a wake-only GPE, disable it */
 757
 758                 status = acpi_ev_disable_gpe(gpe_event_info);
 759
 760                 /* Set GPE to wake-only.  Do not change wake disabled/enabled status */
 761
 762                 acpi_ev_set_gpe_type(gpe_event_info, ACPI_GPE_TYPE_WAKE);
 763
 764                 ACPI_INFO((AE_INFO,
 765                            "GPE %p was updated from wake/run to wake-only",
 766                            gpe_event_info));
 767
 768                 /* This was a wake-only GPE */
 769
 770                 return_ACPI_STATUS(AE_WAKE_ONLY_GPE);
 771         }
 772
 773         return_ACPI_STATUS(AE_OK);
 774 }
 775 #endif