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