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
 211                         /* Clear the GPE (of stale events), then enable it */
 212
 213                         status = acpi_hw_clear_gpe(gpe_event_info);
 214                         if (ACPI_FAILURE(status)) {
 215                                 return_ACPI_STATUS(status);
 216                         }
 217
 218                         /* Enable the requested runtime GPE */
 219
 220                         status = acpi_hw_write_gpe_enable_reg(gpe_event_info);
 221                 }
 222                 break;
 223
 224         default:
 225                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 226         }
 227
 228         return_ACPI_STATUS(AE_OK);
 229 }
 230
 231 /*******************************************************************************
 232  *
 233  * FUNCTION:    acpi_ev_disable_gpe
 234  *
 235  * PARAMETERS:  gpe_event_info          - GPE to disable
 236  *
 237  * RETURN:      Status
 238  *
 239  * DESCRIPTION: Disable a GPE based on the GPE type
 240  *
 241  ******************************************************************************/
 242
 243 acpi_status acpi_ev_disable_gpe(struct acpi_gpe_event_info *gpe_event_info)
 244 {
 245         acpi_status status;
 246
 247         ACPI_FUNCTION_TRACE(ev_disable_gpe);
 248
 249         if (!(gpe_event_info->flags & ACPI_GPE_ENABLE_MASK)) {
 250                 return_ACPI_STATUS(AE_OK);
 251         }
 252
 253         /* Make sure HW enable masks are updated */
 254
 255         status =
 256             acpi_ev_update_gpe_enable_masks(gpe_event_info, ACPI_GPE_DISABLE);
 257         if (ACPI_FAILURE(status)) {
 258                 return_ACPI_STATUS(status);
 259         }
 260
 261         /* Mark wake-disabled or HW disable, or both */
 262
 263         switch (gpe_event_info->flags & ACPI_GPE_TYPE_MASK) {
 264         case ACPI_GPE_TYPE_WAKE:
 265                 ACPI_CLEAR_BIT(gpe_event_info->flags, ACPI_GPE_WAKE_ENABLED);
 266                 break;
 267
 268         case ACPI_GPE_TYPE_WAKE_RUN:
 269                 ACPI_CLEAR_BIT(gpe_event_info->flags, ACPI_GPE_WAKE_ENABLED);
 270
 271                 /*lint -fallthrough */
 272
 273         case ACPI_GPE_TYPE_RUNTIME:
 274
 275                 /* Disable the requested runtime GPE */
 276
 277                 ACPI_CLEAR_BIT(gpe_event_info->flags, ACPI_GPE_RUN_ENABLED);
 278                 status = acpi_hw_write_gpe_enable_reg(gpe_event_info);
 279                 break;
 280
 281         default:
 282                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 283         }
 284
 285         return_ACPI_STATUS(AE_OK);
 286 }
 287
 288 /*******************************************************************************
 289  *
 290  * FUNCTION:    acpi_ev_get_gpe_event_info
 291  *
 292  * PARAMETERS:  gpe_device          - Device node.  NULL for GPE0/GPE1
 293  *              gpe_number          - Raw GPE number
 294  *
 295  * RETURN:      A GPE event_info struct. NULL if not a valid GPE
 296  *
 297  * DESCRIPTION: Returns the event_info struct associated with this GPE.
 298  *              Validates the gpe_block and the gpe_number
 299  *
 300  *              Should be called only when the GPE lists are semaphore locked
 301  *              and not subject to change.
 302  *
 303  ******************************************************************************/
 304
 305 struct acpi_gpe_event_info *acpi_ev_get_gpe_event_info(acpi_handle gpe_device,
 306                                                        u32 gpe_number)
 307 {
 308         union acpi_operand_object *obj_desc;
 309         struct acpi_gpe_block_info *gpe_block;
 310         acpi_native_uint i;
 311
 312         ACPI_FUNCTION_ENTRY();
 313
 314         /* A NULL gpe_block means use the FADT-defined GPE block(s) */
 315
 316         if (!gpe_device) {
 317
 318                 /* Examine GPE Block 0 and 1 (These blocks are permanent) */
 319
 320                 for (i = 0; i < ACPI_MAX_GPE_BLOCKS; i++) {
 321                         gpe_block = acpi_gbl_gpe_fadt_blocks[i];
 322                         if (gpe_block) {
 323                                 if ((gpe_number >= gpe_block->block_base_number)
 324                                     && (gpe_number <
 325                                         gpe_block->block_base_number +
 326                                         (gpe_block->register_count * 8))) {
 327                                         return (&gpe_block->
 328                                                 event_info[gpe_number -
 329                                                            gpe_block->
 330                                                            block_base_number]);
 331                                 }
 332                         }
 333                 }
 334
 335                 /* The gpe_number was not in the range of either FADT GPE block */
 336
 337                 return (NULL);
 338         }
 339
 340         /* A Non-NULL gpe_device means this is a GPE Block Device */
 341
 342         obj_desc =
 343             acpi_ns_get_attached_object((struct acpi_namespace_node *)
 344                                         gpe_device);
 345         if (!obj_desc || !obj_desc->device.gpe_block) {
 346                 return (NULL);
 347         }
 348
 349         gpe_block = obj_desc->device.gpe_block;
 350
 351         if ((gpe_number >= gpe_block->block_base_number) &&
 352             (gpe_number <
 353              gpe_block->block_base_number + (gpe_block->register_count * 8))) {
 354                 return (&gpe_block->
 355                         event_info[gpe_number - gpe_block->block_base_number]);
 356         }
 357
 358         return (NULL);
 359 }
 360
 361 /*******************************************************************************
 362  *
 363  * FUNCTION:    acpi_ev_gpe_detect
 364  *
 365  * PARAMETERS:  gpe_xrupt_list      - Interrupt block for this interrupt.
 366  *                                    Can have multiple GPE blocks attached.
 367  *
 368  * RETURN:      INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED
 369  *
 370  * DESCRIPTION: Detect if any GP events have occurred.  This function is
 371  *              executed at interrupt level.
 372  *
 373  ******************************************************************************/
 374
 375 u32 acpi_ev_gpe_detect(struct acpi_gpe_xrupt_info * gpe_xrupt_list)
 376 {
 377         acpi_status status;
 378         struct acpi_gpe_block_info *gpe_block;
 379         struct acpi_gpe_register_info *gpe_register_info;
 380         u32 int_status = ACPI_INTERRUPT_NOT_HANDLED;
 381         u8 enabled_status_byte;
 382         u32 status_reg;
 383         u32 enable_reg;
 384         acpi_cpu_flags flags;
 385         acpi_cpu_flags hw_flags;
 386         acpi_native_uint i;
 387         acpi_native_uint j;
 388
 389         ACPI_FUNCTION_NAME(ev_gpe_detect);
 390
 391         /* Check for the case where there are no GPEs */
 392
 393         if (!gpe_xrupt_list) {
 394                 return (int_status);
 395         }
 396
 397         /* We need to hold the GPE lock now, hardware lock in the loop */
 398
 399         flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
 400
 401         /* Examine all GPE blocks attached to this interrupt level */
 402
 403         gpe_block = gpe_xrupt_list->gpe_block_list_head;
 404         while (gpe_block) {
 405                 /*
 406                  * Read all of the 8-bit GPE status and enable registers
 407                  * in this GPE block, saving all of them.
 408                  * Find all currently active GP events.
 409                  */
 410                 for (i = 0; i < gpe_block->register_count; i++) {
 411
 412                         /* Get the next status/enable pair */
 413
 414                         gpe_register_info = &gpe_block->register_info[i];
 415
 416                         hw_flags = acpi_os_acquire_lock(acpi_gbl_hardware_lock);
 417
 418                         /* Read the Status Register */
 419
 420                         status =
 421                             acpi_hw_low_level_read(ACPI_GPE_REGISTER_WIDTH,
 422                                                    &status_reg,
 423                                                    &gpe_register_info->
 424                                                    status_address);
 425                         if (ACPI_FAILURE(status)) {
 426                                 acpi_os_release_lock(acpi_gbl_hardware_lock,
 427                                                      hw_flags);
 428                                 goto unlock_and_exit;
 429                         }
 430
 431                         /* Read the Enable Register */
 432
 433                         status =
 434                             acpi_hw_low_level_read(ACPI_GPE_REGISTER_WIDTH,
 435                                                    &enable_reg,
 436                                                    &gpe_register_info->
 437                                                    enable_address);
 438                         acpi_os_release_lock(acpi_gbl_hardware_lock, hw_flags);
 439
 440                         if (ACPI_FAILURE(status)) {
 441                                 goto unlock_and_exit;
 442                         }
 443
 444                         ACPI_DEBUG_PRINT((ACPI_DB_INTERRUPTS,
 445                                           "Read GPE Register at GPE%X: Status=%02X, Enable=%02X\n",
 446                                           gpe_register_info->base_gpe_number,
 447                                           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
 454                                 /* No active GPEs in this register, move on */
 455
 456                                 continue;
 457                         }
 458
 459                         /* Now look at the individual GPEs in this byte register */
 460
 461                         for (j = 0; j < ACPI_GPE_REGISTER_WIDTH; j++) {
 462
 463                                 /* Examine one GPE bit */
 464
 465                                 if (enabled_status_byte &
 466                                     acpi_gbl_decode_to8bit[j]) {
 467                                         /*
 468                                          * Found an active GPE. Dispatch the event to a handler
 469                                          * or method.
 470                                          */
 471                                         int_status |=
 472                                             acpi_ev_gpe_dispatch(&gpe_block->
 473                                                                  event_info[(i *
 474                                                                              ACPI_GPE_REGISTER_WIDTH)
 475                                                                             +
 476                                                                             j],
 477                                                                  (u32) j +
 478                                                                  gpe_register_info->
 479                                                                  base_gpe_number);
 480                                 }
 481                         }
 482                 }
 483
 484                 gpe_block = gpe_block->next;
 485         }
 486
 487       unlock_and_exit:
 488
 489         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 490         return (int_status);
 491 }
 492
 493 /*******************************************************************************
 494  *
 495  * FUNCTION:    acpi_ev_asynch_execute_gpe_method
 496  *
 497  * PARAMETERS:  Context (gpe_event_info) - Info for this GPE
 498  *
 499  * RETURN:      None
 500  *
 501  * DESCRIPTION: Perform the actual execution of a GPE control method. This
 502  *              function is called from an invocation of acpi_os_execute and
 503  *              therefore does NOT execute at interrupt level - so that
 504  *              the control method itself is not executed in the context of
 505  *              an interrupt handler.
 506  *
 507  ******************************************************************************/
 508
 509 static void ACPI_SYSTEM_XFACE acpi_ev_asynch_execute_gpe_method(void *context)
 510 {
 511         struct acpi_gpe_event_info *gpe_event_info = (void *)context;
 512         acpi_status status;
 513         struct acpi_gpe_event_info local_gpe_event_info;
 514         struct acpi_evaluate_info *info;
 515
 516         ACPI_FUNCTION_TRACE(ev_asynch_execute_gpe_method);
 517
 518         status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
 519         if (ACPI_FAILURE(status)) {
 520                 return_VOID;
 521         }
 522
 523         /* Must revalidate the gpe_number/gpe_block */
 524
 525         if (!acpi_ev_valid_gpe_event(gpe_event_info)) {
 526                 status = acpi_ut_release_mutex(ACPI_MTX_EVENTS);
 527                 return_VOID;
 528         }
 529
 530         /* Set the GPE flags for return to enabled state */
 531
 532         (void)acpi_ev_enable_gpe(gpe_event_info, FALSE);
 533
 534         /*
 535          * Take a snapshot of the GPE info for this level - we copy the
 536          * info to prevent a race condition with remove_handler/remove_block.
 537          */
 538         ACPI_MEMCPY(&local_gpe_event_info, gpe_event_info,
 539                     sizeof(struct acpi_gpe_event_info));
 540
 541         status = acpi_ut_release_mutex(ACPI_MTX_EVENTS);
 542         if (ACPI_FAILURE(status)) {
 543                 return_VOID;
 544         }
 545
 546         /*
 547          * Must check for control method type dispatch one more
 548          * time to avoid race with ev_gpe_install_handler
 549          */
 550         if ((local_gpe_event_info.flags & ACPI_GPE_DISPATCH_MASK) ==
 551             ACPI_GPE_DISPATCH_METHOD) {
 552
 553                 /* Allocate the evaluation information block */
 554
 555                 info = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info));
 556                 if (!info) {
 557                         status = AE_NO_MEMORY;
 558                 } else {
 559                         /*
 560                          * Invoke the GPE Method (_Lxx, _Exx) i.e., evaluate the _Lxx/_Exx
 561                          * control method that corresponds to this GPE
 562                          */
 563                         info->prefix_node =
 564                             local_gpe_event_info.dispatch.method_node;
 565                         info->parameters =
 566                             ACPI_CAST_PTR(union acpi_operand_object *,
 567                                           gpe_event_info);
 568                         info->parameter_type = ACPI_PARAM_GPE;
 569                         info->flags = ACPI_IGNORE_RETURN_VALUE;
 570
 571                         status = acpi_ns_evaluate(info);
 572                         ACPI_FREE(info);
 573                 }
 574
 575                 if (ACPI_FAILURE(status)) {
 576                         ACPI_EXCEPTION((AE_INFO, status,
 577                                         "While evaluating GPE method [%4.4s]",
 578                                         acpi_ut_get_node_name
 579                                         (local_gpe_event_info.dispatch.
 580                                          method_node)));
 581                 }
 582         }
 583
 584         if ((local_gpe_event_info.flags & ACPI_GPE_XRUPT_TYPE_MASK) ==
 585             ACPI_GPE_LEVEL_TRIGGERED) {
 586                 /*
 587                  * GPE is level-triggered, we clear the GPE status bit after
 588                  * handling the event.
 589                  */
 590                 status = acpi_hw_clear_gpe(&local_gpe_event_info);
 591                 if (ACPI_FAILURE(status)) {
 592                         return_VOID;
 593                 }
 594         }
 595
 596         /* Enable this GPE */
 597
 598         (void)acpi_hw_write_gpe_enable_reg(&local_gpe_event_info);
 599         return_VOID;
 600 }
 601
 602 /*******************************************************************************
 603  *
 604  * FUNCTION:    acpi_ev_gpe_dispatch
 605  *
 606  * PARAMETERS:  gpe_event_info  - Info for this GPE
 607  *              gpe_number      - Number relative to the parent GPE block
 608  *
 609  * RETURN:      INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED
 610  *
 611  * DESCRIPTION: Dispatch a General Purpose Event to either a function (e.g. EC)
 612  *              or method (e.g. _Lxx/_Exx) handler.
 613  *
 614  *              This function executes at interrupt level.
 615  *
 616  ******************************************************************************/
 617
 618 u32
 619 acpi_ev_gpe_dispatch(struct acpi_gpe_event_info *gpe_event_info, u32 gpe_number)
 620 {
 621         acpi_status status;
 622
 623         ACPI_FUNCTION_TRACE(ev_gpe_dispatch);
 624
 625         /*
 626          * If edge-triggered, clear the GPE status bit now.  Note that
 627          * level-triggered events are cleared after the GPE is serviced.
 628          */
 629         if ((gpe_event_info->flags & ACPI_GPE_XRUPT_TYPE_MASK) ==
 630             ACPI_GPE_EDGE_TRIGGERED) {
 631                 status = acpi_hw_clear_gpe(gpe_event_info);
 632                 if (ACPI_FAILURE(status)) {
 633                         ACPI_EXCEPTION((AE_INFO, status,
 634                                         "Unable to clear GPE[%2X]",
 635                                         gpe_number));
 636                         return_UINT32(ACPI_INTERRUPT_NOT_HANDLED);
 637                 }
 638         }
 639
 640         /* Save current system state */
 641
 642         if (acpi_gbl_system_awake_and_running) {
 643                 ACPI_SET_BIT(gpe_event_info->flags, ACPI_GPE_SYSTEM_RUNNING);
 644         } else {
 645                 ACPI_CLEAR_BIT(gpe_event_info->flags, ACPI_GPE_SYSTEM_RUNNING);
 646         }
 647
 648         /*
 649          * Dispatch the GPE to either an installed handler, or the control
 650          * method associated with this GPE (_Lxx or _Exx).
 651          * If a handler exists, we invoke it and do not attempt to run the method.
 652          * If there is neither a handler nor a method, we disable the level to
 653          * prevent further events from coming in here.
 654          */
 655         switch (gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) {
 656         case ACPI_GPE_DISPATCH_HANDLER:
 657
 658                 /*
 659                  * Invoke the installed handler (at interrupt level)
 660                  * Ignore return status for now.  TBD: leave GPE disabled on error?
 661                  */
 662                 (void)gpe_event_info->dispatch.handler->address(gpe_event_info->
 663                                                                 dispatch.
 664                                                                 handler->
 665                                                                 context);
 666
 667                 /* It is now safe to clear level-triggered events. */
 668
 669                 if ((gpe_event_info->flags & ACPI_GPE_XRUPT_TYPE_MASK) ==
 670                     ACPI_GPE_LEVEL_TRIGGERED) {
 671                         status = acpi_hw_clear_gpe(gpe_event_info);
 672                         if (ACPI_FAILURE(status)) {
 673                                 ACPI_EXCEPTION((AE_INFO, status,
 674                                                 "Unable to clear GPE[%2X]",
 675                                                 gpe_number));
 676                                 return_UINT32(ACPI_INTERRUPT_NOT_HANDLED);
 677                         }
 678                 }
 679                 break;
 680
 681         case ACPI_GPE_DISPATCH_METHOD:
 682
 683                 /*
 684                  * Disable GPE, so it doesn't keep firing before the method has a
 685                  * chance to run.
 686                  */
 687                 status = acpi_ev_disable_gpe(gpe_event_info);
 688                 if (ACPI_FAILURE(status)) {
 689                         ACPI_EXCEPTION((AE_INFO, status,
 690                                         "Unable to disable GPE[%2X]",
 691                                         gpe_number));
 692                         return_UINT32(ACPI_INTERRUPT_NOT_HANDLED);
 693                 }
 694
 695                 /*
 696                  * Execute the method associated with the GPE
 697                  * NOTE: Level-triggered GPEs are cleared after the method completes.
 698                  */
 699                 status = acpi_os_execute(OSL_GPE_HANDLER,
 700                                          acpi_ev_asynch_execute_gpe_method,
 701                                          gpe_event_info);
 702                 if (ACPI_FAILURE(status)) {
 703                         ACPI_EXCEPTION((AE_INFO, status,
 704                                         "Unable to queue handler for GPE[%2X] - event disabled",
 705                                         gpe_number));
 706                 }
 707                 break;
 708
 709         default:
 710
 711                 /* No handler or method to run! */
 712
 713                 ACPI_ERROR((AE_INFO,
 714                             "No handler or method for GPE[%2X], disabling event",
 715                             gpe_number));
 716
 717                 /*
 718                  * Disable the GPE.  The GPE will remain disabled until the ACPI
 719                  * Core Subsystem is restarted, or a handler is installed.
 720                  */
 721                 status = acpi_ev_disable_gpe(gpe_event_info);
 722                 if (ACPI_FAILURE(status)) {
 723                         ACPI_EXCEPTION((AE_INFO, status,
 724                                         "Unable to disable GPE[%2X]",
 725                                         gpe_number));
 726                         return_UINT32(ACPI_INTERRUPT_NOT_HANDLED);
 727                 }
 728                 break;
 729         }
 730
 731         return_UINT32(ACPI_INTERRUPT_HANDLED);
 732 }
 733
 734 #ifdef ACPI_GPE_NOTIFY_CHECK
 735 /*******************************************************************************
 736  * TBD: NOT USED, PROTOTYPE ONLY AND WILL PROBABLY BE REMOVED
 737  *
 738  * FUNCTION:    acpi_ev_check_for_wake_only_gpe
 739  *
 740  * PARAMETERS:  gpe_event_info  - info for this GPE
 741  *
 742  * RETURN:      Status
 743  *
 744  * DESCRIPTION: Determine if a a GPE is "wake-only".
 745  *
 746  *              Called from Notify() code in interpreter when a "DeviceWake"
 747  *              Notify comes in.
 748  *
 749  ******************************************************************************/
 750
 751 acpi_status
 752 acpi_ev_check_for_wake_only_gpe(struct acpi_gpe_event_info *gpe_event_info)
 753 {
 754         acpi_status status;
 755
 756         ACPI_FUNCTION_TRACE(ev_check_for_wake_only_gpe);
 757
 758         if ((gpe_event_info) && /* Only >0 for _Lxx/_Exx */
 759             ((gpe_event_info->flags & ACPI_GPE_SYSTEM_MASK) == ACPI_GPE_SYSTEM_RUNNING)) {      /* System state at GPE time */
 760                 /* This must be a wake-only GPE, disable it */
 761
 762                 status = acpi_ev_disable_gpe(gpe_event_info);
 763
 764                 /* Set GPE to wake-only.  Do not change wake disabled/enabled status */
 765
 766                 acpi_ev_set_gpe_type(gpe_event_info, ACPI_GPE_TYPE_WAKE);
 767
 768                 ACPI_INFO((AE_INFO,
 769                            "GPE %p was updated from wake/run to wake-only",
 770                            gpe_event_info));
 771
 772                 /* This was a wake-only GPE */
 773
 774                 return_ACPI_STATUS(AE_WAKE_ONLY_GPE);
 775         }
 776
 777         return_ACPI_STATUS(AE_OK);
 778 }
 779 #endif