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   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         u32                             flags;
 400         acpi_status                     status;
 401         struct acpi_gpe_block_info      *gpe_block;
 402         acpi_native_uint                i;
 403         acpi_native_uint                j;
 404
 405
 406         ACPI_FUNCTION_NAME ("ev_gpe_detect");
 407
 408         /* Check for the case where there are no GPEs */
 409
 410         if (!gpe_xrupt_list) {
 411                 return (int_status);
 412         }
 413
 414         /* Examine all GPE blocks attached to this interrupt level */
 415
 416         flags = acpi_os_acquire_lock (acpi_gbl_gpe_lock);
 417         gpe_block = gpe_xrupt_list->gpe_block_list_head;
 418         while (gpe_block) {
 419                 /*
 420                  * Read all of the 8-bit GPE status and enable registers
 421                  * in this GPE block, saving all of them.
 422                  * Find all currently active GP events.
 423                  */
 424                 for (i = 0; i < gpe_block->register_count; i++) {
 425                         /* Get the next status/enable pair */
 426
 427                         gpe_register_info = &gpe_block->register_info[i];
 428
 429                         /* Read the Status Register */
 430
 431                         status = acpi_hw_low_level_read (ACPI_GPE_REGISTER_WIDTH, &status_reg,
 432                                          &gpe_register_info->status_address);
 433                         if (ACPI_FAILURE (status)) {
 434                                 goto unlock_and_exit;
 435                         }
 436
 437                         /* Read the Enable Register */
 438
 439                         status = acpi_hw_low_level_read (ACPI_GPE_REGISTER_WIDTH, &enable_reg,
 440                                          &gpe_register_info->enable_address);
 441                         if (ACPI_FAILURE (status)) {
 442                                 goto unlock_and_exit;
 443                         }
 444
 445                         ACPI_DEBUG_PRINT ((ACPI_DB_INTERRUPTS,
 446                                 "Read GPE Register at GPE%X: Status=%02X, Enable=%02X\n",
 447                                 gpe_register_info->base_gpe_number, status_reg, enable_reg));
 448
 449                         /* Check if there is anything active at all in this register */
 450
 451                         enabled_status_byte = (u8) (status_reg & enable_reg);
 452                         if (!enabled_status_byte) {
 453                                 /* No active GPEs in this register, move on */
 454
 455                                 continue;
 456                         }
 457
 458                         /* Now look at the individual GPEs in this byte register */
 459
 460                         for (j = 0; j < ACPI_GPE_REGISTER_WIDTH; j++) {
 461                                 /* Examine one GPE bit */
 462
 463                                 if (enabled_status_byte & acpi_gbl_decode_to8bit[j]) {
 464                                         /*
 465                                          * Found an active GPE. Dispatch the event to a handler
 466                                          * or method.
 467                                          */
 468                                         int_status |= acpi_ev_gpe_dispatch (
 469                                                 &gpe_block->event_info[(i * ACPI_GPE_REGISTER_WIDTH) + j],
 470                                                 (u32) j + gpe_register_info->base_gpe_number);
 471                                 }
 472                         }
 473                 }
 474
 475                 gpe_block = gpe_block->next;
 476         }
 477
 478 unlock_and_exit:
 479
 480         acpi_os_release_lock (acpi_gbl_gpe_lock, flags);
 481         return (int_status);
 482 }
 483
 484
 485 /*******************************************************************************
 486  *
 487  * FUNCTION:    acpi_ev_asynch_execute_gpe_method
 488  *
 489  * PARAMETERS:  Context (gpe_event_info) - Info for this GPE
 490  *
 491  * RETURN:      None
 492  *
 493  * DESCRIPTION: Perform the actual execution of a GPE control method.  This
 494  *              function is called from an invocation of acpi_os_queue_for_execution
 495  *              (and therefore does NOT execute at interrupt level) so that
 496  *              the control method itself is not executed in the context of
 497  *              an interrupt handler.
 498  *
 499  ******************************************************************************/
 500
 501 static void ACPI_SYSTEM_XFACE
 502 acpi_ev_asynch_execute_gpe_method (
 503         void                            *context)
 504 {
 505         struct acpi_gpe_event_info      *gpe_event_info = (void *) context;
 506         u32                             gpe_number = 0;
 507         acpi_status                     status;
 508         struct acpi_gpe_event_info      local_gpe_event_info;
 509         struct acpi_parameter_info      info;
 510
 511
 512         ACPI_FUNCTION_TRACE ("ev_asynch_execute_gpe_method");
 513
 514
 515         status = acpi_ut_acquire_mutex (ACPI_MTX_EVENTS);
 516         if (ACPI_FAILURE (status)) {
 517                 return_VOID;
 518         }
 519
 520         /* Must revalidate the gpe_number/gpe_block */
 521
 522         if (!acpi_ev_valid_gpe_event (gpe_event_info)) {
 523                 status = acpi_ut_release_mutex (ACPI_MTX_EVENTS);
 524                 return_VOID;
 525         }
 526
 527         /* Set the GPE flags for return to enabled state */
 528
 529         (void) acpi_ev_enable_gpe (gpe_event_info, FALSE);
 530
 531         /*
 532          * Take a snapshot of the GPE info for this level - we copy the
 533          * info to prevent a race condition with remove_handler/remove_block.
 534          */
 535         ACPI_MEMCPY (&local_gpe_event_info, gpe_event_info,
 536                 sizeof (struct acpi_gpe_event_info));
 537
 538         status = acpi_ut_release_mutex (ACPI_MTX_EVENTS);
 539         if (ACPI_FAILURE (status)) {
 540                 return_VOID;
 541         }
 542
 543         /*
 544          * Must check for control method type dispatch one more
 545          * time to avoid race with ev_gpe_install_handler
 546          */
 547         if ((local_gpe_event_info.flags & ACPI_GPE_DISPATCH_MASK) ==
 548                         ACPI_GPE_DISPATCH_METHOD) {
 549                 /*
 550                  * Invoke the GPE Method (_Lxx, _Exx) i.e., evaluate the _Lxx/_Exx
 551                  * control method that corresponds to this GPE
 552                  */
 553                 info.node = local_gpe_event_info.dispatch.method_node;
 554                 info.parameters = ACPI_CAST_PTR (union acpi_operand_object *, gpe_event_info);
 555                 info.parameter_type = ACPI_PARAM_GPE;
 556
 557                 status = acpi_ns_evaluate_by_handle (&info);
 558                 if (ACPI_FAILURE (status)) {
 559                         ACPI_REPORT_ERROR ((
 560                                 "%s while evaluating method [%4.4s] for GPE[%2X]\n",
 561                                 acpi_format_exception (status),
 562                                 acpi_ut_get_node_name (local_gpe_event_info.dispatch.method_node),
 563                                 gpe_number));
 564                 }
 565         }
 566
 567         if ((local_gpe_event_info.flags & ACPI_GPE_XRUPT_TYPE_MASK) ==
 568                         ACPI_GPE_LEVEL_TRIGGERED) {
 569                 /*
 570                  * GPE is level-triggered, we clear the GPE status bit after
 571                  * handling the event.
 572                  */
 573                 status = acpi_hw_clear_gpe (&local_gpe_event_info);
 574                 if (ACPI_FAILURE (status)) {
 575                         return_VOID;
 576                 }
 577         }
 578
 579         /* Enable this GPE */
 580
 581         (void) acpi_hw_write_gpe_enable_reg (&local_gpe_event_info);
 582         return_VOID;
 583 }
 584
 585
 586 /*******************************************************************************
 587  *
 588  * FUNCTION:    acpi_ev_gpe_dispatch
 589  *
 590  * PARAMETERS:  gpe_event_info  - Info for this GPE
 591  *              gpe_number      - Number relative to the parent GPE block
 592  *
 593  * RETURN:      INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED
 594  *
 595  * DESCRIPTION: Dispatch a General Purpose Event to either a function (e.g. EC)
 596  *              or method (e.g. _Lxx/_Exx) handler.
 597  *
 598  *              This function executes at interrupt level.
 599  *
 600  ******************************************************************************/
 601
 602 u32
 603 acpi_ev_gpe_dispatch (
 604         struct acpi_gpe_event_info      *gpe_event_info,
 605         u32                             gpe_number)
 606 {
 607         acpi_status                     status;
 608
 609
 610         ACPI_FUNCTION_TRACE ("ev_gpe_dispatch");
 611
 612
 613         /*
 614          * If edge-triggered, clear the GPE status bit now.  Note that
 615          * level-triggered events are cleared after the GPE is serviced.
 616          */
 617         if ((gpe_event_info->flags & ACPI_GPE_XRUPT_TYPE_MASK) ==
 618                         ACPI_GPE_EDGE_TRIGGERED) {
 619                 status = acpi_hw_clear_gpe (gpe_event_info);
 620                 if (ACPI_FAILURE (status)) {
 621                         ACPI_REPORT_ERROR ((
 622                                 "acpi_ev_gpe_dispatch: %s, Unable to clear GPE[%2X]\n",
 623                                 acpi_format_exception (status), gpe_number));
 624                         return_VALUE (ACPI_INTERRUPT_NOT_HANDLED);
 625                 }
 626         }
 627
 628         /* Save current system state */
 629
 630         if (acpi_gbl_system_awake_and_running) {
 631                 ACPI_SET_BIT (gpe_event_info->flags, ACPI_GPE_SYSTEM_RUNNING);
 632         }
 633         else {
 634                 ACPI_CLEAR_BIT (gpe_event_info->flags, ACPI_GPE_SYSTEM_RUNNING);
 635         }
 636
 637         /*
 638          * Dispatch the GPE to either an installed handler, or the control
 639          * method associated with this GPE (_Lxx or _Exx).
 640          * If a handler exists, we invoke it and do not attempt to run the method.
 641          * If there is neither a handler nor a method, we disable the level to
 642          * prevent further events from coming in here.
 643          */
 644         switch (gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) {
 645         case ACPI_GPE_DISPATCH_HANDLER:
 646
 647                 /*
 648                  * Invoke the installed handler (at interrupt level)
 649                  * Ignore return status for now.  TBD: leave GPE disabled on error?
 650                  */
 651                 (void) gpe_event_info->dispatch.handler->address (
 652                                   gpe_event_info->dispatch.handler->context);
 653
 654                 /* It is now safe to clear level-triggered events. */
 655
 656                 if ((gpe_event_info->flags & ACPI_GPE_XRUPT_TYPE_MASK) ==
 657                                 ACPI_GPE_LEVEL_TRIGGERED) {
 658                         status = acpi_hw_clear_gpe (gpe_event_info);
 659                         if (ACPI_FAILURE (status)) {
 660                                 ACPI_REPORT_ERROR ((
 661                                         "acpi_ev_gpe_dispatch: %s, Unable to clear GPE[%2X]\n",
 662                                         acpi_format_exception (status), gpe_number));
 663                                 return_VALUE (ACPI_INTERRUPT_NOT_HANDLED);
 664                         }
 665                 }
 666                 break;
 667
 668         case ACPI_GPE_DISPATCH_METHOD:
 669
 670                 /*
 671                  * Disable GPE, so it doesn't keep firing before the method has a
 672                  * chance to run.
 673                  */
 674                 status = acpi_ev_disable_gpe (gpe_event_info);
 675                 if (ACPI_FAILURE (status)) {
 676                         ACPI_REPORT_ERROR ((
 677                                 "acpi_ev_gpe_dispatch: %s, Unable to disable GPE[%2X]\n",
 678                                 acpi_format_exception (status), gpe_number));
 679                         return_VALUE (ACPI_INTERRUPT_NOT_HANDLED);
 680                 }
 681
 682                 /*
 683                  * Execute the method associated with the GPE
 684                  * NOTE: Level-triggered GPEs are cleared after the method completes.
 685                  */
 686                 status = acpi_os_queue_for_execution (OSD_PRIORITY_GPE,
 687                                  acpi_ev_asynch_execute_gpe_method, gpe_event_info);
 688                 if (ACPI_FAILURE (status)) {
 689                         ACPI_REPORT_ERROR ((
 690                                 "acpi_ev_gpe_dispatch: %s, Unable to queue handler for GPE[%2X] - event disabled\n",
 691                                 acpi_format_exception (status), gpe_number));
 692                 }
 693                 break;
 694
 695         default:
 696
 697                 /* No handler or method to run! */
 698
 699                 ACPI_REPORT_ERROR ((
 700                         "acpi_ev_gpe_dispatch: No handler or method for GPE[%2X], disabling event\n",
 701                         gpe_number));
 702
 703                 /*
 704                  * Disable the GPE.  The GPE will remain disabled until the ACPI
 705                  * Core Subsystem is restarted, or a handler is installed.
 706                  */
 707                 status = acpi_ev_disable_gpe (gpe_event_info);
 708                 if (ACPI_FAILURE (status)) {
 709                         ACPI_REPORT_ERROR ((
 710                                 "acpi_ev_gpe_dispatch: %s, Unable to disable GPE[%2X]\n",
 711                                 acpi_format_exception (status), gpe_number));
 712                         return_VALUE (ACPI_INTERRUPT_NOT_HANDLED);
 713                 }
 714                 break;
 715         }
 716
 717         return_VALUE (ACPI_INTERRUPT_HANDLED);
 718 }
 719
 720
 721 #ifdef ACPI_GPE_NOTIFY_CHECK
 722 /*******************************************************************************
 723  * TBD: NOT USED, PROTOTYPE ONLY AND WILL PROBABLY BE REMOVED
 724  *
 725  * FUNCTION:    acpi_ev_check_for_wake_only_gpe
 726  *
 727  * PARAMETERS:  gpe_event_info  - info for this GPE
 728  *
 729  * RETURN:      Status
 730  *
 731  * DESCRIPTION: Determine if a a GPE is "wake-only".
 732  *
 733  *              Called from Notify() code in interpreter when a "device_wake"
 734  *              Notify comes in.
 735  *
 736  ******************************************************************************/
 737
 738 acpi_status
 739 acpi_ev_check_for_wake_only_gpe (
 740         struct acpi_gpe_event_info      *gpe_event_info)
 741 {
 742         acpi_status                     status;
 743
 744
 745         ACPI_FUNCTION_TRACE ("ev_check_for_wake_only_gpe");
 746
 747
 748         if ((gpe_event_info) &&  /* Only >0 for _Lxx/_Exx */
 749            ((gpe_event_info->flags & ACPI_GPE_SYSTEM_MASK) == ACPI_GPE_SYSTEM_RUNNING)) /* System state at GPE time */ {
 750                 /* This must be a wake-only GPE, disable it */
 751
 752                 status = acpi_ev_disable_gpe (gpe_event_info);
 753
 754                 /* Set GPE to wake-only.  Do not change wake disabled/enabled status */
 755
 756                 acpi_ev_set_gpe_type (gpe_event_info, ACPI_GPE_TYPE_WAKE);
 757
 758                 ACPI_REPORT_INFO (("GPE %p was updated from wake/run to wake-only\n",
 759                                 gpe_event_info));
 760
 761                 /* This was a wake-only GPE */
 762
 763                 return_ACPI_STATUS (AE_WAKE_ONLY_GPE);
 764         }
 765
 766         return_ACPI_STATUS (AE_OK);
 767 }
 768 #endif
 769
 770