git.oblomov.eu Git - linux-2.6/blob - 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                         /* Clear the GPE (of stale events), then enable it */
 211
 212                         status = acpi_hw_clear_gpe(gpe_event_info);
 213                         if (ACPI_FAILURE(status)) {
 214                                 return_ACPI_STATUS(status);
 215                         }
 216
 217                         /* Enable the requested runtime GPE */
 218
 219                         status = acpi_hw_write_gpe_enable_reg(gpe_event_info);
 220                 }
 221                 break;
 222
 223         default:
 224                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 225         }
 226
 227         return_ACPI_STATUS(AE_OK);
 228 }
 229
 230 /*******************************************************************************
 231  *
 232  * FUNCTION:    acpi_ev_disable_gpe
 233  *
 234  * PARAMETERS:  gpe_event_info          - GPE to disable
 235  *
 236  * RETURN:      Status
 237  *
 238  * DESCRIPTION: Disable a GPE based on the GPE type
 239  *
 240  ******************************************************************************/
 241
 242 acpi_status acpi_ev_disable_gpe(struct acpi_gpe_event_info *gpe_event_info)
 243 {
 244         acpi_status status;
 245
 246         ACPI_FUNCTION_TRACE("ev_disable_gpe");
 247
 248         if (!(gpe_event_info->flags & ACPI_GPE_ENABLE_MASK)) {
 249                 return_ACPI_STATUS(AE_OK);
 250         }
 251
 252         /* Make sure HW enable masks are updated */
 253
 254         status =
 255             acpi_ev_update_gpe_enable_masks(gpe_event_info, ACPI_GPE_DISABLE);
 256         if (ACPI_FAILURE(status)) {
 257                 return_ACPI_STATUS(status);
 258         }
 259
 260         /* Mark wake-disabled or HW disable, or both */
 261
 262         switch (gpe_event_info->flags & ACPI_GPE_TYPE_MASK) {
 263         case ACPI_GPE_TYPE_WAKE:
 264                 ACPI_CLEAR_BIT(gpe_event_info->flags, ACPI_GPE_WAKE_ENABLED);
 265                 break;
 266
 267         case ACPI_GPE_TYPE_WAKE_RUN:
 268                 ACPI_CLEAR_BIT(gpe_event_info->flags, ACPI_GPE_WAKE_ENABLED);
 269
 270                 /*lint -fallthrough */
 271
 272         case ACPI_GPE_TYPE_RUNTIME:
 273
 274                 /* Disable the requested runtime GPE */
 275
 276                 ACPI_CLEAR_BIT(gpe_event_info->flags, ACPI_GPE_RUN_ENABLED);
 277                 status = acpi_hw_write_gpe_enable_reg(gpe_event_info);
 278                 break;
 279
 280         default:
 281                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 282         }
 283
 284         return_ACPI_STATUS(AE_OK);
 285 }
 286
 287 /*******************************************************************************
 288  *
 289  * FUNCTION:    acpi_ev_get_gpe_event_info
 290  *
 291  * PARAMETERS:  gpe_device          - Device node.  NULL for GPE0/GPE1
 292  *              gpe_number          - Raw GPE number
 293  *
 294  * RETURN:      A GPE event_info struct. NULL if not a valid GPE
 295  *
 296  * DESCRIPTION: Returns the event_info struct associated with this GPE.
 297  *              Validates the gpe_block and the gpe_number
 298  *
 299  *              Should be called only when the GPE lists are semaphore locked
 300  *              and not subject to change.
 301  *
 302  ******************************************************************************/
 303
 304 struct acpi_gpe_event_info *acpi_ev_get_gpe_event_info(acpi_handle gpe_device,
 305                                                        u32 gpe_number)
 306 {
 307         union acpi_operand_object *obj_desc;
 308         struct acpi_gpe_block_info *gpe_block;
 309         acpi_native_uint i;
 310
 311         ACPI_FUNCTION_ENTRY();
 312
 313         /* A NULL gpe_block means use the FADT-defined GPE block(s) */
 314
 315         if (!gpe_device) {
 316                 /* Examine GPE Block 0 and 1 (These blocks are permanent) */
 317
 318                 for (i = 0; i < ACPI_MAX_GPE_BLOCKS; i++) {
 319                         gpe_block = acpi_gbl_gpe_fadt_blocks[i];
 320                         if (gpe_block) {
 321                                 if ((gpe_number >= gpe_block->block_base_number)
 322                                     && (gpe_number <
 323                                         gpe_block->block_base_number +
 324                                         (gpe_block->register_count * 8))) {
 325                                         return (&gpe_block->
 326                                                 event_info[gpe_number -
 327                                                            gpe_block->
 328                                                            block_base_number]);
 329                                 }
 330                         }
 331                 }
 332
 333                 /* The gpe_number was not in the range of either FADT GPE block */
 334
 335                 return (NULL);
 336         }
 337
 338         /* A Non-NULL gpe_device means this is a GPE Block Device */
 339
 340         obj_desc =
 341             acpi_ns_get_attached_object((struct acpi_namespace_node *)
 342                                         gpe_device);
 343         if (!obj_desc || !obj_desc->device.gpe_block) {
 344                 return (NULL);
 345         }
 346
 347         gpe_block = obj_desc->device.gpe_block;
 348
 349         if ((gpe_number >= gpe_block->block_base_number) &&
 350             (gpe_number <
 351              gpe_block->block_base_number + (gpe_block->register_count * 8))) {
 352                 return (&gpe_block->
 353                         event_info[gpe_number - gpe_block->block_base_number]);
 354         }
 355
 356         return (NULL);
 357 }
 358
 359 /*******************************************************************************
 360  *
 361  * FUNCTION:    acpi_ev_gpe_detect
 362  *
 363  * PARAMETERS:  gpe_xrupt_list      - Interrupt block for this interrupt.
 364  *                                    Can have multiple GPE blocks attached.
 365  *
 366  * RETURN:      INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED
 367  *
 368  * DESCRIPTION: Detect if any GP events have occurred.  This function is
 369  *              executed at interrupt level.
 370  *
 371  ******************************************************************************/
 372
 373 u32 acpi_ev_gpe_detect(struct acpi_gpe_xrupt_info * gpe_xrupt_list)
 374 {
 375         acpi_status status;
 376         struct acpi_gpe_block_info *gpe_block;
 377         struct acpi_gpe_register_info *gpe_register_info;
 378         u32 int_status = ACPI_INTERRUPT_NOT_HANDLED;
 379         u8 enabled_status_byte;
 380         u32 status_reg;
 381         u32 enable_reg;
 382         acpi_cpu_flags flags;
 383         acpi_native_uint i;
 384         acpi_native_uint j;
 385
 386         ACPI_FUNCTION_NAME("ev_gpe_detect");
 387
 388         /* Check for the case where there are no GPEs */
 389
 390         if (!gpe_xrupt_list) {
 391                 return (int_status);
 392         }
 393
 394         /* Examine all GPE blocks attached to this interrupt level */
 395
 396         flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
 397         gpe_block = gpe_xrupt_list->gpe_block_list_head;
 398         while (gpe_block) {
 399                 /*
 400                  * Read all of the 8-bit GPE status and enable registers
 401                  * in this GPE block, saving all of them.
 402                  * Find all currently active GP events.
 403                  */
 404                 for (i = 0; i < gpe_block->register_count; i++) {
 405                         /* Get the next status/enable pair */
 406
 407                         gpe_register_info = &gpe_block->register_info[i];
 408
 409                         /* Read the Status Register */
 410
 411                         status =
 412                             acpi_hw_low_level_read(ACPI_GPE_REGISTER_WIDTH,
 413                                                    &status_reg,
 414                                                    &gpe_register_info->
 415                                                    status_address);
 416                         if (ACPI_FAILURE(status)) {
 417                                 goto unlock_and_exit;
 418                         }
 419
 420                         /* Read the Enable Register */
 421
 422                         status =
 423                             acpi_hw_low_level_read(ACPI_GPE_REGISTER_WIDTH,
 424                                                    &enable_reg,
 425                                                    &gpe_register_info->
 426                                                    enable_address);
 427                         if (ACPI_FAILURE(status)) {
 428                                 goto unlock_and_exit;
 429                         }
 430
 431                         ACPI_DEBUG_PRINT((ACPI_DB_INTERRUPTS,
 432                                           "Read GPE Register at GPE%X: Status=%02X, Enable=%02X\n",
 433                                           gpe_register_info->base_gpe_number,
 434                                           status_reg, enable_reg));
 435
 436                         /* Check if there is anything active at all in this register */
 437
 438                         enabled_status_byte = (u8) (status_reg & enable_reg);
 439                         if (!enabled_status_byte) {
 440                                 /* No active GPEs in this register, move on */
 441
 442                                 continue;
 443                         }
 444
 445                         /* Now look at the individual GPEs in this byte register */
 446
 447                         for (j = 0; j < ACPI_GPE_REGISTER_WIDTH; j++) {
 448                                 /* Examine one GPE bit */
 449
 450                                 if (enabled_status_byte &
 451                                     acpi_gbl_decode_to8bit[j]) {
 452                                         /*
 453                                          * Found an active GPE. Dispatch the event to a handler
 454                                          * or method.
 455                                          */
 456                                         int_status |=
 457                                             acpi_ev_gpe_dispatch(&gpe_block->
 458                                                                  event_info[(i *
 459                                                                              ACPI_GPE_REGISTER_WIDTH)
 460                                                                             +
 461                                                                             j],
 462                                                                  (u32) j +
 463                                                                  gpe_register_info->
 464                                                                  base_gpe_number);
 465                                 }
 466                         }
 467                 }
 468
 469                 gpe_block = gpe_block->next;
 470         }
 471
 472       unlock_and_exit:
 473
 474         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 475         return (int_status);
 476 }
 477
 478 /*******************************************************************************
 479  *
 480  * FUNCTION:    acpi_ev_asynch_execute_gpe_method
 481  *
 482  * PARAMETERS:  Context (gpe_event_info) - Info for this GPE
 483  *
 484  * RETURN:      None
 485  *
 486  * DESCRIPTION: Perform the actual execution of a GPE control method.  This
 487  *              function is called from an invocation of acpi_os_queue_for_execution
 488  *              (and therefore does NOT execute at interrupt level) so that
 489  *              the control method itself is not executed in the context of
 490  *              an interrupt handler.
 491  *
 492  ******************************************************************************/
 493
 494 static void ACPI_SYSTEM_XFACE acpi_ev_asynch_execute_gpe_method(void *context)
 495 {
 496         struct acpi_gpe_event_info *gpe_event_info = (void *)context;
 497         u32 gpe_number = 0;
 498         acpi_status status;
 499         struct acpi_gpe_event_info local_gpe_event_info;
 500         struct acpi_parameter_info info;
 501
 502         ACPI_FUNCTION_TRACE("ev_asynch_execute_gpe_method");
 503
 504         status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
 505         if (ACPI_FAILURE(status)) {
 506                 return_VOID;
 507         }
 508
 509         /* Must revalidate the gpe_number/gpe_block */
 510
 511         if (!acpi_ev_valid_gpe_event(gpe_event_info)) {
 512                 status = acpi_ut_release_mutex(ACPI_MTX_EVENTS);
 513                 return_VOID;
 514         }
 515
 516         /* Set the GPE flags for return to enabled state */
 517
 518         (void)acpi_ev_enable_gpe(gpe_event_info, FALSE);
 519
 520         /*
 521          * Take a snapshot of the GPE info for this level - we copy the
 522          * info to prevent a race condition with remove_handler/remove_block.
 523          */
 524         ACPI_MEMCPY(&local_gpe_event_info, gpe_event_info,
 525                     sizeof(struct acpi_gpe_event_info));
 526
 527         status = acpi_ut_release_mutex(ACPI_MTX_EVENTS);
 528         if (ACPI_FAILURE(status)) {
 529                 return_VOID;
 530         }
 531
 532         /*
 533          * Must check for control method type dispatch one more
 534          * time to avoid race with ev_gpe_install_handler
 535          */
 536         if ((local_gpe_event_info.flags & ACPI_GPE_DISPATCH_MASK) ==
 537             ACPI_GPE_DISPATCH_METHOD) {
 538                 /*
 539                  * Invoke the GPE Method (_Lxx, _Exx) i.e., evaluate the _Lxx/_Exx
 540                  * control method that corresponds to this GPE
 541                  */
 542                 info.node = local_gpe_event_info.dispatch.method_node;
 543                 info.parameters =
 544                     ACPI_CAST_PTR(union acpi_operand_object *, gpe_event_info);
 545                 info.parameter_type = ACPI_PARAM_GPE;
 546
 547                 status = acpi_ns_evaluate_by_handle(&info);
 548                 if (ACPI_FAILURE(status)) {
 549                         ACPI_EXCEPTION((AE_INFO, status,
 550                                         "While evaluating method [%4.4s] for GPE[%2X]",
 551                                         acpi_ut_get_node_name
 552                                         (local_gpe_event_info.dispatch.
 553                                          method_node), gpe_number));
 554                 }
 555         }
 556
 557         if ((local_gpe_event_info.flags & ACPI_GPE_XRUPT_TYPE_MASK) ==
 558             ACPI_GPE_LEVEL_TRIGGERED) {
 559                 /*
 560                  * GPE is level-triggered, we clear the GPE status bit after
 561                  * handling the event.
 562                  */
 563                 status = acpi_hw_clear_gpe(&local_gpe_event_info);
 564                 if (ACPI_FAILURE(status)) {
 565                         return_VOID;
 566                 }
 567         }
 568
 569         /* Enable this GPE */
 570
 571         (void)acpi_hw_write_gpe_enable_reg(&local_gpe_event_info);
 572         return_VOID;
 573 }
 574
 575 /*******************************************************************************
 576  *
 577  * FUNCTION:    acpi_ev_gpe_dispatch
 578  *
 579  * PARAMETERS:  gpe_event_info  - Info for this GPE
 580  *              gpe_number      - Number relative to the parent GPE block
 581  *
 582  * RETURN:      INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED
 583  *
 584  * DESCRIPTION: Dispatch a General Purpose Event to either a function (e.g. EC)
 585  *              or method (e.g. _Lxx/_Exx) handler.
 586  *
 587  *              This function executes at interrupt level.
 588  *
 589  ******************************************************************************/
 590
 591 u32
 592 acpi_ev_gpe_dispatch(struct acpi_gpe_event_info *gpe_event_info, u32 gpe_number)
 593 {
 594         acpi_status status;
 595
 596         ACPI_FUNCTION_TRACE("ev_gpe_dispatch");
 597
 598         /*
 599          * If edge-triggered, clear the GPE status bit now.  Note that
 600          * level-triggered events are cleared after the GPE is serviced.
 601          */
 602         if ((gpe_event_info->flags & ACPI_GPE_XRUPT_TYPE_MASK) ==
 603             ACPI_GPE_EDGE_TRIGGERED) {
 604                 status = acpi_hw_clear_gpe(gpe_event_info);
 605                 if (ACPI_FAILURE(status)) {
 606                         ACPI_EXCEPTION((AE_INFO, status,
 607                                         "Unable to clear GPE[%2X]",
 608                                         gpe_number));
 609                         return_UINT32(ACPI_INTERRUPT_NOT_HANDLED);
 610                 }
 611         }
 612
 613         /* Save current system state */
 614
 615         if (acpi_gbl_system_awake_and_running) {
 616                 ACPI_SET_BIT(gpe_event_info->flags, ACPI_GPE_SYSTEM_RUNNING);
 617         } else {
 618                 ACPI_CLEAR_BIT(gpe_event_info->flags, ACPI_GPE_SYSTEM_RUNNING);
 619         }
 620
 621         /*
 622          * Dispatch the GPE to either an installed handler, or the control
 623          * method associated with this GPE (_Lxx or _Exx).
 624          * If a handler exists, we invoke it and do not attempt to run the method.
 625          * If there is neither a handler nor a method, we disable the level to
 626          * prevent further events from coming in here.
 627          */
 628         switch (gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) {
 629         case ACPI_GPE_DISPATCH_HANDLER:
 630
 631                 /*
 632                  * Invoke the installed handler (at interrupt level)
 633                  * Ignore return status for now.  TBD: leave GPE disabled on error?
 634                  */
 635                 (void)gpe_event_info->dispatch.handler->address(gpe_event_info->
 636                                                                 dispatch.
 637                                                                 handler->
 638                                                                 context);
 639
 640                 /* It is now safe to clear level-triggered events. */
 641
 642                 if ((gpe_event_info->flags & ACPI_GPE_XRUPT_TYPE_MASK) ==
 643                     ACPI_GPE_LEVEL_TRIGGERED) {
 644                         status = acpi_hw_clear_gpe(gpe_event_info);
 645                         if (ACPI_FAILURE(status)) {
 646                                 ACPI_EXCEPTION((AE_INFO, status,
 647                                                 "Unable to clear GPE[%2X]",
 648                                                 gpe_number));
 649                                 return_UINT32(ACPI_INTERRUPT_NOT_HANDLED);
 650                         }
 651                 }
 652                 break;
 653
 654         case ACPI_GPE_DISPATCH_METHOD:
 655
 656                 /*
 657                  * Disable GPE, so it doesn't keep firing before the method has a
 658                  * chance to run.
 659                  */
 660                 status = acpi_ev_disable_gpe(gpe_event_info);
 661                 if (ACPI_FAILURE(status)) {
 662                         ACPI_EXCEPTION((AE_INFO, status,
 663                                         "Unable to disable GPE[%2X]",
 664                                         gpe_number));
 665                         return_UINT32(ACPI_INTERRUPT_NOT_HANDLED);
 666                 }
 667
 668                 /*
 669                  * Execute the method associated with the GPE
 670                  * NOTE: Level-triggered GPEs are cleared after the method completes.
 671                  */
 672                 status = acpi_os_queue_for_execution(OSD_PRIORITY_GPE,
 673                                                      acpi_ev_asynch_execute_gpe_method,
 674                                                      gpe_event_info);
 675                 if (ACPI_FAILURE(status)) {
 676                         ACPI_EXCEPTION((AE_INFO, status,
 677                                         "Unable to queue handler for GPE[%2X] - event disabled",
 678                                         gpe_number));
 679                 }
 680                 break;
 681
 682         default:
 683
 684                 /* No handler or method to run! */
 685
 686                 ACPI_ERROR((AE_INFO,
 687                             "No handler or method for GPE[%2X], disabling event",
 688                             gpe_number));
 689
 690                 /*
 691                  * Disable the GPE.  The GPE will remain disabled until the ACPI
 692                  * Core Subsystem is restarted, or a handler is installed.
 693                  */
 694                 status = acpi_ev_disable_gpe(gpe_event_info);
 695                 if (ACPI_FAILURE(status)) {
 696                         ACPI_EXCEPTION((AE_INFO, status,
 697                                         "Unable to disable GPE[%2X]",
 698                                         gpe_number));
 699                         return_UINT32(ACPI_INTERRUPT_NOT_HANDLED);
 700                 }
 701                 break;
 702         }
 703
 704         return_UINT32(ACPI_INTERRUPT_HANDLED);
 705 }
 706
 707 #ifdef ACPI_GPE_NOTIFY_CHECK
 708 /*******************************************************************************
 709  * TBD: NOT USED, PROTOTYPE ONLY AND WILL PROBABLY BE REMOVED
 710  *
 711  * FUNCTION:    acpi_ev_check_for_wake_only_gpe
 712  *
 713  * PARAMETERS:  gpe_event_info  - info for this GPE
 714  *
 715  * RETURN:      Status
 716  *
 717  * DESCRIPTION: Determine if a a GPE is "wake-only".
 718  *
 719  *              Called from Notify() code in interpreter when a "device_wake"
 720  *              Notify comes in.
 721  *
 722  ******************************************************************************/
 723
 724 acpi_status
 725 acpi_ev_check_for_wake_only_gpe(struct acpi_gpe_event_info *gpe_event_info)
 726 {
 727         acpi_status status;
 728
 729         ACPI_FUNCTION_TRACE("ev_check_for_wake_only_gpe");
 730
 731         if ((gpe_event_info) && /* Only >0 for _Lxx/_Exx */
 732             ((gpe_event_info->flags & ACPI_GPE_SYSTEM_MASK) == ACPI_GPE_SYSTEM_RUNNING)) {      /* System state at GPE time */
 733                 /* This must be a wake-only GPE, disable it */
 734
 735                 status = acpi_ev_disable_gpe(gpe_event_info);
 736
 737                 /* Set GPE to wake-only.  Do not change wake disabled/enabled status */
 738
 739                 acpi_ev_set_gpe_type(gpe_event_info, ACPI_GPE_TYPE_WAKE);
 740
 741                 ACPI_INFO((AE_INFO,
 742                            "GPE %p was updated from wake/run to wake-only",
 743                            gpe_event_info));
 744
 745                 /* This was a wake-only GPE */
 746
 747                 return_ACPI_STATUS(AE_WAKE_ONLY_GPE);
 748         }
 749
 750         return_ACPI_STATUS(AE_OK);
 751 }
 752 #endif