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 - 2005, 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
  53 static void ACPI_SYSTEM_XFACE
  54 acpi_ev_asynch_execute_gpe_method (
  55         void                            *context);
  56
  57
  58 /*******************************************************************************
  59  *
  60  * FUNCTION:    acpi_ev_set_gpe_type
  61  *
  62  * PARAMETERS:  gpe_event_info          - GPE to set
  63  *              Type                    - New type
  64  *
  65  * RETURN:      Status
  66  *
  67  * DESCRIPTION: Sets the new type for the GPE (wake, run, or wake/run)
  68  *
  69  ******************************************************************************/
  70
  71 acpi_status
  72 acpi_ev_set_gpe_type (
  73         struct acpi_gpe_event_info      *gpe_event_info,
  74         u8                              type)
  75 {
  76         acpi_status                     status;
  77
  78
  79         ACPI_FUNCTION_TRACE ("ev_set_gpe_type");
  80
  81
  82         /* Validate type and update register enable masks */
  83
  84         switch (type) {
  85         case ACPI_GPE_TYPE_WAKE:
  86         case ACPI_GPE_TYPE_RUNTIME:
  87         case ACPI_GPE_TYPE_WAKE_RUN:
  88                 break;
  89
  90         default:
  91                 return_ACPI_STATUS (AE_BAD_PARAMETER);
  92         }
  93
  94         /* Disable the GPE if currently enabled */
  95
  96         status = acpi_ev_disable_gpe (gpe_event_info);
  97
  98         /* Type was validated above */
  99
 100         gpe_event_info->flags &= ~ACPI_GPE_TYPE_MASK; /* Clear type bits */
 101         gpe_event_info->flags |= type;              /* Insert type */
 102         return_ACPI_STATUS (status);
 103 }
 104
 105
 106 /*******************************************************************************
 107  *
 108  * FUNCTION:    acpi_ev_update_gpe_enable_masks
 109  *
 110  * PARAMETERS:  gpe_event_info          - GPE to update
 111  *              Type                    - What to do: ACPI_GPE_DISABLE or
 112  *                                        ACPI_GPE_ENABLE
 113  *
 114  * RETURN:      Status
 115  *
 116  * DESCRIPTION: Updates GPE register enable masks based on the GPE type
 117  *
 118  ******************************************************************************/
 119
 120 acpi_status
 121 acpi_ev_update_gpe_enable_masks (
 122         struct acpi_gpe_event_info      *gpe_event_info,
 123         u8                              type)
 124 {
 125         struct acpi_gpe_register_info   *gpe_register_info;
 126         u8                              register_bit;
 127
 128
 129         ACPI_FUNCTION_TRACE ("ev_update_gpe_enable_masks");
 130
 131
 132         gpe_register_info = gpe_event_info->register_info;
 133         if (!gpe_register_info) {
 134                 return_ACPI_STATUS (AE_NOT_EXIST);
 135         }
 136         register_bit = gpe_event_info->register_bit;
 137
 138         /* 1) Disable case.  Simply clear all enable bits */
 139
 140         if (type == ACPI_GPE_DISABLE) {
 141                 ACPI_CLEAR_BIT (gpe_register_info->enable_for_wake, register_bit);
 142                 ACPI_CLEAR_BIT (gpe_register_info->enable_for_run, register_bit);
 143                 return_ACPI_STATUS (AE_OK);
 144         }
 145
 146         /* 2) Enable case.  Set/Clear the appropriate enable bits */
 147
 148         switch (gpe_event_info->flags & ACPI_GPE_TYPE_MASK) {
 149         case ACPI_GPE_TYPE_WAKE:
 150                 ACPI_SET_BIT   (gpe_register_info->enable_for_wake, register_bit);
 151                 ACPI_CLEAR_BIT (gpe_register_info->enable_for_run, register_bit);
 152                 break;
 153
 154         case ACPI_GPE_TYPE_RUNTIME:
 155                 ACPI_CLEAR_BIT (gpe_register_info->enable_for_wake, register_bit);
 156                 ACPI_SET_BIT   (gpe_register_info->enable_for_run, register_bit);
 157                 break;
 158
 159         case ACPI_GPE_TYPE_WAKE_RUN:
 160                 ACPI_SET_BIT   (gpe_register_info->enable_for_wake, register_bit);
 161                 ACPI_SET_BIT   (gpe_register_info->enable_for_run, register_bit);
 162                 break;
 163
 164         default:
 165                 return_ACPI_STATUS (AE_BAD_PARAMETER);
 166         }
 167
 168         return_ACPI_STATUS (AE_OK);
 169 }
 170
 171
 172 /*******************************************************************************
 173  *
 174  * FUNCTION:    acpi_ev_enable_gpe
 175  *
 176  * PARAMETERS:  gpe_event_info          - GPE to enable
 177  *              write_to_hardware       - Enable now, or just mark data structs
 178  *                                        (WAKE GPEs should be deferred)
 179  *
 180  * RETURN:      Status
 181  *
 182  * DESCRIPTION: Enable a GPE based on the GPE type
 183  *
 184  ******************************************************************************/
 185
 186 acpi_status
 187 acpi_ev_enable_gpe (
 188         struct acpi_gpe_event_info      *gpe_event_info,
 189         u8                              write_to_hardware)
 190 {
 191         acpi_status                     status;
 192
 193
 194         ACPI_FUNCTION_TRACE ("ev_enable_gpe");
 195
 196
 197         /* Make sure HW enable masks are updated */
 198
 199         status = acpi_ev_update_gpe_enable_masks (gpe_event_info, ACPI_GPE_ENABLE);
 200         if (ACPI_FAILURE (status)) {
 201                 return_ACPI_STATUS (status);
 202         }
 203
 204         /* Mark wake-enabled or HW enable, or both */
 205
 206         switch (gpe_event_info->flags & ACPI_GPE_TYPE_MASK) {
 207         case ACPI_GPE_TYPE_WAKE:
 208
 209                 ACPI_SET_BIT (gpe_event_info->flags, ACPI_GPE_WAKE_ENABLED);
 210                 break;
 211
 212         case ACPI_GPE_TYPE_WAKE_RUN:
 213
 214                 ACPI_SET_BIT (gpe_event_info->flags, ACPI_GPE_WAKE_ENABLED);
 215
 216                 /*lint -fallthrough */
 217
 218         case ACPI_GPE_TYPE_RUNTIME:
 219
 220                 ACPI_SET_BIT (gpe_event_info->flags, ACPI_GPE_RUN_ENABLED);
 221
 222                 if (write_to_hardware) {
 223                         /* Clear the GPE (of stale events), then enable it */
 224
 225                         status = acpi_hw_clear_gpe (gpe_event_info);
 226                         if (ACPI_FAILURE (status)) {
 227                                 return_ACPI_STATUS (status);
 228                         }
 229
 230                         /* Enable the requested runtime GPE */
 231
 232                         status = acpi_hw_write_gpe_enable_reg (gpe_event_info);
 233                 }
 234                 break;
 235
 236         default:
 237                 return_ACPI_STATUS (AE_BAD_PARAMETER);
 238         }
 239
 240         return_ACPI_STATUS (AE_OK);
 241 }
 242
 243
 244 /*******************************************************************************
 245  *
 246  * FUNCTION:    acpi_ev_disable_gpe
 247  *
 248  * PARAMETERS:  gpe_event_info          - GPE to disable
 249  *
 250  * RETURN:      Status
 251  *
 252  * DESCRIPTION: Disable a GPE based on the GPE type
 253  *
 254  ******************************************************************************/
 255
 256 acpi_status
 257 acpi_ev_disable_gpe (
 258         struct acpi_gpe_event_info      *gpe_event_info)
 259 {
 260         acpi_status                     status;
 261
 262
 263         ACPI_FUNCTION_TRACE ("ev_disable_gpe");
 264
 265
 266         if (!(gpe_event_info->flags & ACPI_GPE_ENABLE_MASK)) {
 267                 return_ACPI_STATUS (AE_OK);
 268         }
 269
 270         /* Make sure HW enable masks are updated */
 271
 272         status = acpi_ev_update_gpe_enable_masks (gpe_event_info, ACPI_GPE_DISABLE);
 273         if (ACPI_FAILURE (status)) {
 274                 return_ACPI_STATUS (status);
 275         }
 276
 277         /* Mark wake-disabled or HW disable, or both */
 278
 279         switch (gpe_event_info->flags & ACPI_GPE_TYPE_MASK) {
 280         case ACPI_GPE_TYPE_WAKE:
 281                 ACPI_CLEAR_BIT (gpe_event_info->flags, ACPI_GPE_WAKE_ENABLED);
 282                 break;
 283
 284         case ACPI_GPE_TYPE_WAKE_RUN:
 285                 ACPI_CLEAR_BIT (gpe_event_info->flags, ACPI_GPE_WAKE_ENABLED);
 286
 287                 /*lint -fallthrough */
 288
 289         case ACPI_GPE_TYPE_RUNTIME:
 290
 291                 /* Disable the requested runtime GPE */
 292
 293                 ACPI_CLEAR_BIT (gpe_event_info->flags, ACPI_GPE_RUN_ENABLED);
 294                 status = acpi_hw_write_gpe_enable_reg (gpe_event_info);
 295                 break;
 296
 297         default:
 298                 return_ACPI_STATUS (AE_BAD_PARAMETER);
 299         }
 300
 301         return_ACPI_STATUS (AE_OK);
 302 }
 303
 304
 305 /*******************************************************************************
 306  *
 307  * FUNCTION:    acpi_ev_get_gpe_event_info
 308  *
 309  * PARAMETERS:  gpe_device          - Device node.  NULL for GPE0/GPE1
 310  *              gpe_number          - Raw GPE number
 311  *
 312  * RETURN:      A GPE event_info struct. NULL if not a valid GPE
 313  *
 314  * DESCRIPTION: Returns the event_info struct associated with this GPE.
 315  *              Validates the gpe_block and the gpe_number
 316  *
 317  *              Should be called only when the GPE lists are semaphore locked
 318  *              and not subject to change.
 319  *
 320  ******************************************************************************/
 321
 322 struct acpi_gpe_event_info *
 323 acpi_ev_get_gpe_event_info (
 324         acpi_handle                     gpe_device,
 325         u32                             gpe_number)
 326 {
 327         union acpi_operand_object       *obj_desc;
 328         struct acpi_gpe_block_info      *gpe_block;
 329         acpi_native_uint                i;
 330
 331
 332         ACPI_FUNCTION_ENTRY ();
 333
 334
 335         /* A NULL gpe_block means use the FADT-defined GPE block(s) */
 336
 337         if (!gpe_device) {
 338                 /* Examine GPE Block 0 and 1 (These blocks are permanent) */
 339
 340                 for (i = 0; i < ACPI_MAX_GPE_BLOCKS; i++) {
 341                         gpe_block = acpi_gbl_gpe_fadt_blocks[i];
 342                         if (gpe_block) {
 343                                 if ((gpe_number >= gpe_block->block_base_number) &&
 344                                         (gpe_number < gpe_block->block_base_number +
 345                                                 (gpe_block->register_count * 8))) {
 346                                         return (&gpe_block->event_info[gpe_number -
 347                                                 gpe_block->block_base_number]);
 348                                 }
 349                         }
 350                 }
 351
 352                 /* The gpe_number was not in the range of either FADT GPE block */
 353
 354                 return (NULL);
 355         }
 356
 357         /* A Non-NULL gpe_device means this is a GPE Block Device */
 358
 359         obj_desc = acpi_ns_get_attached_object ((struct acpi_namespace_node *) gpe_device);
 360         if (!obj_desc ||
 361                 !obj_desc->device.gpe_block) {
 362                 return (NULL);
 363         }
 364
 365         gpe_block = obj_desc->device.gpe_block;
 366
 367         if ((gpe_number >= gpe_block->block_base_number) &&
 368                 (gpe_number < gpe_block->block_base_number + (gpe_block->register_count * 8))) {
 369                 return (&gpe_block->event_info[gpe_number - gpe_block->block_base_number]);
 370         }
 371
 372         return (NULL);
 373 }
 374
 375
 376 /*******************************************************************************
 377  *
 378  * FUNCTION:    acpi_ev_gpe_detect
 379  *
 380  * PARAMETERS:  gpe_xrupt_list      - Interrupt block for this interrupt.
 381  *                                    Can have multiple GPE blocks attached.
 382  *
 383  * RETURN:      INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED
 384  *
 385  * DESCRIPTION: Detect if any GP events have occurred.  This function is
 386  *              executed at interrupt level.
 387  *
 388  ******************************************************************************/
 389
 390 u32
 391 acpi_ev_gpe_detect (
 392         struct acpi_gpe_xrupt_info      *gpe_xrupt_list)
 393 {
 394         u32                             int_status = ACPI_INTERRUPT_NOT_HANDLED;
 395         u8                              enabled_status_byte;
 396         struct acpi_gpe_register_info   *gpe_register_info;
 397         u32                             status_reg;
 398         u32                             enable_reg;
 399         acpi_status                     status;
 400         struct acpi_gpe_block_info      *gpe_block;
 401         acpi_native_uint                i;
 402         acpi_native_uint                j;
 403
 404
 405         ACPI_FUNCTION_NAME ("ev_gpe_detect");
 406
 407         /* Check for the case where there are no GPEs */
 408
 409         if (!gpe_xrupt_list) {
 410                 return (int_status);
 411         }
 412
 413         /* Examine all GPE blocks attached to this interrupt level */
 414
 415         acpi_os_acquire_lock (acpi_gbl_gpe_lock, ACPI_ISR);
 416         gpe_block = gpe_xrupt_list->gpe_block_list_head;
 417         while (gpe_block) {
 418                 /*
 419                  * Read all of the 8-bit GPE status and enable registers
 420                  * in this GPE block, saving all of them.
 421                  * Find all currently active GP events.
 422                  */
 423                 for (i = 0; i < gpe_block->register_count; i++) {
 424                         /* Get the next status/enable pair */
 425
 426                         gpe_register_info = &gpe_block->register_info[i];
 427
 428                         /* Read the Status Register */
 429
 430                         status = acpi_hw_low_level_read (ACPI_GPE_REGISTER_WIDTH, &status_reg,
 431                                          &gpe_register_info->status_address);
 432                         if (ACPI_FAILURE (status)) {
 433                                 goto unlock_and_exit;
 434                         }
 435
 436                         /* Read the Enable Register */
 437
 438                         status = acpi_hw_low_level_read (ACPI_GPE_REGISTER_WIDTH, &enable_reg,
 439                                          &gpe_register_info->enable_address);
 440                         if (ACPI_FAILURE (status)) {
 441                                 goto unlock_and_exit;
 442                         }
 443
 444                         ACPI_DEBUG_PRINT ((ACPI_DB_INTERRUPTS,
 445                                 "Read GPE Register at GPE%X: Status=%02X, Enable=%02X\n",
 446                                 gpe_register_info->base_gpe_number, status_reg, enable_reg));
 447
 448                         /* Check if there is anything active at all in this register */
 449
 450                         enabled_status_byte = (u8) (status_reg & enable_reg);
 451                         if (!enabled_status_byte) {
 452                                 /* No active GPEs in this register, move on */
 453
 454                                 continue;
 455                         }
 456
 457                         /* Now look at the individual GPEs in this byte register */
 458
 459                         for (j = 0; j < ACPI_GPE_REGISTER_WIDTH; j++) {
 460                                 /* Examine one GPE bit */
 461
 462                                 if (enabled_status_byte & acpi_gbl_decode_to8bit[j]) {
 463                                         /*
 464                                          * Found an active GPE. Dispatch the event to a handler
 465                                          * or method.
 466                                          */
 467                                         int_status |= acpi_ev_gpe_dispatch (
 468                                                 &gpe_block->event_info[(i * ACPI_GPE_REGISTER_WIDTH) + j],
 469                                                 (u32) j + gpe_register_info->base_gpe_number);
 470                                 }
 471                         }
 472                 }
 473
 474                 gpe_block = gpe_block->next;
 475         }
 476
 477 unlock_and_exit:
 478
 479         acpi_os_release_lock (acpi_gbl_gpe_lock, ACPI_ISR);
 480         return (int_status);
 481 }
 482
 483
 484 /*******************************************************************************
 485  *
 486  * FUNCTION:    acpi_ev_asynch_execute_gpe_method
 487  *
 488  * PARAMETERS:  Context (gpe_event_info) - Info for this GPE
 489  *
 490  * RETURN:      None
 491  *
 492  * DESCRIPTION: Perform the actual execution of a GPE control method.  This
 493  *              function is called from an invocation of acpi_os_queue_for_execution
 494  *              (and therefore does NOT execute at interrupt level) so that
 495  *              the control method itself is not executed in the context of
 496  *              an interrupt handler.
 497  *
 498  ******************************************************************************/
 499
 500 static void ACPI_SYSTEM_XFACE
 501 acpi_ev_asynch_execute_gpe_method (
 502         void                            *context)
 503 {
 504         struct acpi_gpe_event_info      *gpe_event_info = (void *) context;
 505         u32                             gpe_number = 0;
 506         acpi_status                     status;
 507         struct acpi_gpe_event_info      local_gpe_event_info;
 508         struct acpi_parameter_info      info;
 509
 510
 511         ACPI_FUNCTION_TRACE ("ev_asynch_execute_gpe_method");
 512
 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                  * Invoke the GPE Method (_Lxx, _Exx) i.e., evaluate the _Lxx/_Exx
 550                  * control method that corresponds to this GPE
 551                  */
 552                 info.node = local_gpe_event_info.dispatch.method_node;
 553                 info.parameters = ACPI_CAST_PTR (union acpi_operand_object *, gpe_event_info);
 554                 info.parameter_type = ACPI_PARAM_GPE;
 555
 556                 status = acpi_ns_evaluate_by_handle (&info);
 557                 if (ACPI_FAILURE (status)) {
 558                         ACPI_REPORT_ERROR ((
 559                                 "%s while evaluating method [%4.4s] for GPE[%2X]\n",
 560                                 acpi_format_exception (status),
 561                                 acpi_ut_get_node_name (local_gpe_event_info.dispatch.method_node),
 562                                 gpe_number));
 563                 }
 564         }
 565
 566         if ((local_gpe_event_info.flags & ACPI_GPE_XRUPT_TYPE_MASK) ==
 567                         ACPI_GPE_LEVEL_TRIGGERED) {
 568                 /*
 569                  * GPE is level-triggered, we clear the GPE status bit after
 570                  * handling the event.
 571                  */
 572                 status = acpi_hw_clear_gpe (&local_gpe_event_info);
 573                 if (ACPI_FAILURE (status)) {
 574                         return_VOID;
 575                 }
 576         }
 577
 578         /* Enable this GPE */
 579
 580         (void) acpi_hw_write_gpe_enable_reg (&local_gpe_event_info);
 581         return_VOID;
 582 }
 583
 584
 585 /*******************************************************************************
 586  *
 587  * FUNCTION:    acpi_ev_gpe_dispatch
 588  *
 589  * PARAMETERS:  gpe_event_info  - Info for this GPE
 590  *              gpe_number      - Number relative to the parent GPE block
 591  *
 592  * RETURN:      INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED
 593  *
 594  * DESCRIPTION: Dispatch a General Purpose Event to either a function (e.g. EC)
 595  *              or method (e.g. _Lxx/_Exx) handler.
 596  *
 597  *              This function executes at interrupt level.
 598  *
 599  ******************************************************************************/
 600
 601 u32
 602 acpi_ev_gpe_dispatch (
 603         struct acpi_gpe_event_info      *gpe_event_info,
 604         u32                             gpe_number)
 605 {
 606         acpi_status                     status;
 607
 608
 609         ACPI_FUNCTION_TRACE ("ev_gpe_dispatch");
 610
 611
 612         /*
 613          * If edge-triggered, clear the GPE status bit now.  Note that
 614          * level-triggered events are cleared after the GPE is serviced.
 615          */
 616         if ((gpe_event_info->flags & ACPI_GPE_XRUPT_TYPE_MASK) ==
 617                         ACPI_GPE_EDGE_TRIGGERED) {
 618                 status = acpi_hw_clear_gpe (gpe_event_info);
 619                 if (ACPI_FAILURE (status)) {
 620                         ACPI_REPORT_ERROR ((
 621                                 "acpi_ev_gpe_dispatch: %s, Unable to clear GPE[%2X]\n",
 622                                 acpi_format_exception (status), gpe_number));
 623                         return_VALUE (ACPI_INTERRUPT_NOT_HANDLED);
 624                 }
 625         }
 626
 627         /* Save current system state */
 628
 629         if (acpi_gbl_system_awake_and_running) {
 630                 ACPI_SET_BIT (gpe_event_info->flags, ACPI_GPE_SYSTEM_RUNNING);
 631         }
 632         else {
 633                 ACPI_CLEAR_BIT (gpe_event_info->flags, ACPI_GPE_SYSTEM_RUNNING);
 634         }
 635
 636         /*
 637          * Dispatch the GPE to either an installed handler, or the control
 638          * method associated with this GPE (_Lxx or _Exx).
 639          * If a handler exists, we invoke it and do not attempt to run the method.
 640          * If there is neither a handler nor a method, we disable the level to
 641          * prevent further events from coming in here.
 642          */
 643         switch (gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) {
 644         case ACPI_GPE_DISPATCH_HANDLER:
 645
 646                 /*
 647                  * Invoke the installed handler (at interrupt level)
 648                  * Ignore return status for now.  TBD: leave GPE disabled on error?
 649                  */
 650                 (void) gpe_event_info->dispatch.handler->address (
 651                                   gpe_event_info->dispatch.handler->context);
 652
 653                 /* It is now safe to clear level-triggered events. */
 654
 655                 if ((gpe_event_info->flags & ACPI_GPE_XRUPT_TYPE_MASK) ==
 656                                 ACPI_GPE_LEVEL_TRIGGERED) {
 657                         status = acpi_hw_clear_gpe (gpe_event_info);
 658                         if (ACPI_FAILURE (status)) {
 659                                 ACPI_REPORT_ERROR ((
 660                                         "acpi_ev_gpe_dispatch: %s, Unable to clear GPE[%2X]\n",
 661                                         acpi_format_exception (status), gpe_number));
 662                                 return_VALUE (ACPI_INTERRUPT_NOT_HANDLED);
 663                         }
 664                 }
 665                 break;
 666
 667         case ACPI_GPE_DISPATCH_METHOD:
 668
 669                 /*
 670                  * Disable GPE, so it doesn't keep firing before the method has a
 671                  * chance to run.
 672                  */
 673                 status = acpi_ev_disable_gpe (gpe_event_info);
 674                 if (ACPI_FAILURE (status)) {
 675                         ACPI_REPORT_ERROR ((
 676                                 "acpi_ev_gpe_dispatch: %s, Unable to disable GPE[%2X]\n",
 677                                 acpi_format_exception (status), gpe_number));
 678                         return_VALUE (ACPI_INTERRUPT_NOT_HANDLED);
 679                 }
 680
 681                 /*
 682                  * Execute the method associated with the GPE
 683                  * NOTE: Level-triggered GPEs are cleared after the method completes.
 684                  */
 685                 status = acpi_os_queue_for_execution (OSD_PRIORITY_GPE,
 686                                  acpi_ev_asynch_execute_gpe_method, gpe_event_info);
 687                 if (ACPI_FAILURE (status)) {
 688                         ACPI_REPORT_ERROR ((
 689                                 "acpi_ev_gpe_dispatch: %s, Unable to queue handler for GPE[%2X] - event disabled\n",
 690                                 acpi_format_exception (status), gpe_number));
 691                 }
 692                 break;
 693
 694         default:
 695
 696                 /* No handler or method to run! */
 697
 698                 ACPI_REPORT_ERROR ((
 699                         "acpi_ev_gpe_dispatch: No handler or method for GPE[%2X], disabling event\n",
 700                         gpe_number));
 701
 702                 /*
 703                  * Disable the GPE.  The GPE will remain disabled until the ACPI
 704                  * Core Subsystem is restarted, or a handler is installed.
 705                  */
 706                 status = acpi_ev_disable_gpe (gpe_event_info);
 707                 if (ACPI_FAILURE (status)) {
 708                         ACPI_REPORT_ERROR ((
 709                                 "acpi_ev_gpe_dispatch: %s, Unable to disable GPE[%2X]\n",
 710                                 acpi_format_exception (status), gpe_number));
 711                         return_VALUE (ACPI_INTERRUPT_NOT_HANDLED);
 712                 }
 713                 break;
 714         }
 715
 716         return_VALUE (ACPI_INTERRUPT_HANDLED);
 717 }
 718
 719
 720 #ifdef ACPI_GPE_NOTIFY_CHECK
 721 /*******************************************************************************
 722  * TBD: NOT USED, PROTOTYPE ONLY AND WILL PROBABLY BE REMOVED
 723  *
 724  * FUNCTION:    acpi_ev_check_for_wake_only_gpe
 725  *
 726  * PARAMETERS:  gpe_event_info  - info for this GPE
 727  *
 728  * RETURN:      Status
 729  *
 730  * DESCRIPTION: Determine if a a GPE is "wake-only".
 731  *
 732  *              Called from Notify() code in interpreter when a "device_wake"
 733  *              Notify comes in.
 734  *
 735  ******************************************************************************/
 736
 737 acpi_status
 738 acpi_ev_check_for_wake_only_gpe (
 739         struct acpi_gpe_event_info      *gpe_event_info)
 740 {
 741         acpi_status                     status;
 742
 743
 744         ACPI_FUNCTION_TRACE ("ev_check_for_wake_only_gpe");
 745
 746
 747         if ((gpe_event_info) &&  /* Only >0 for _Lxx/_Exx */
 748            ((gpe_event_info->flags & ACPI_GPE_SYSTEM_MASK) == ACPI_GPE_SYSTEM_RUNNING)) /* System state at GPE time */ {
 749                 /* This must be a wake-only GPE, disable it */
 750
 751                 status = acpi_ev_disable_gpe (gpe_event_info);
 752
 753                 /* Set GPE to wake-only.  Do not change wake disabled/enabled status */
 754
 755                 acpi_ev_set_gpe_type (gpe_event_info, ACPI_GPE_TYPE_WAKE);
 756
 757                 ACPI_REPORT_INFO (("GPE %p was updated from wake/run to wake-only\n",
 758                                 gpe_event_info));
 759
 760                 /* This was a wake-only GPE */
 761
 762                 return_ACPI_STATUS (AE_WAKE_ONLY_GPE);
 763         }
 764
 765         return_ACPI_STATUS (AE_OK);
 766 }
 767 #endif
 768
 769