drivers/acpi/acpica/evxface.c

   1 // SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
   2 /******************************************************************************
   3  *
   4  * Module Name: evxface - External interfaces for ACPI events
   5  *
   6  * Copyright (C) 2000 - 2018, Intel Corp.
   7  *
   8  *****************************************************************************/
   9
  10 #define EXPORT_ACPI_INTERFACES
  11
  12 #include <acpi/acpi.h>
  13 #include "accommon.h"
  14 #include "acnamesp.h"
  15 #include "acevents.h"
  16 #include "acinterp.h"
  17
  18 #define _COMPONENT          ACPI_EVENTS
  19 ACPI_MODULE_NAME("evxface")
  20 #if (!ACPI_REDUCED_HARDWARE)
  21 /* Local prototypes */
  22 static acpi_status
  23 acpi_ev_install_gpe_handler(acpi_handle gpe_device,
  24                             u32 gpe_number,
  25                             u32 type,
  26                             u8 is_raw_handler,
  27                             acpi_gpe_handler address, void *context);
  28
  29 #endif
  30
  31
  32 /*******************************************************************************
  33  *
  34  * FUNCTION:    acpi_install_notify_handler
  35  *
  36  * PARAMETERS:  device          - The device for which notifies will be handled
  37  *              handler_type    - The type of handler:
  38  *                                  ACPI_SYSTEM_NOTIFY: System Handler (00-7F)
  39  *                                  ACPI_DEVICE_NOTIFY: Device Handler (80-FF)
  40  *                                  ACPI_ALL_NOTIFY:    Both System and Device
  41  *              handler         - Address of the handler
  42  *              context         - Value passed to the handler on each GPE
  43  *
  44  * RETURN:      Status
  45  *
  46  * DESCRIPTION: Install a handler for notifications on an ACPI Device,
  47  *              thermal_zone, or Processor object.
  48  *
  49  * NOTES:       The Root namespace object may have only one handler for each
  50  *              type of notify (System/Device). Device/Thermal/Processor objects
  51  *              may have one device notify handler, and multiple system notify
  52  *              handlers.
  53  *
  54  ******************************************************************************/
  55
  56 acpi_status
  57 acpi_install_notify_handler(acpi_handle device,
  58                             u32 handler_type,
  59                             acpi_notify_handler handler, void *context)
  60 {
  61         struct acpi_namespace_node *node =
  62             ACPI_CAST_PTR(struct acpi_namespace_node, device);
  63         union acpi_operand_object *obj_desc;
  64         union acpi_operand_object *handler_obj;
  65         acpi_status status;
  66         u32 i;
  67
  68         ACPI_FUNCTION_TRACE(acpi_install_notify_handler);
  69
  70         /* Parameter validation */
  71
  72         if ((!device) || (!handler) || (!handler_type) ||
  73             (handler_type > ACPI_MAX_NOTIFY_HANDLER_TYPE)) {
  74                 return_ACPI_STATUS(AE_BAD_PARAMETER);
  75         }
  76
  77         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
  78         if (ACPI_FAILURE(status)) {
  79                 return_ACPI_STATUS(status);
  80         }
  81
  82         /*
  83          * Root Object:
  84          * Registering a notify handler on the root object indicates that the
  85          * caller wishes to receive notifications for all objects. Note that
  86          * only one global handler can be registered per notify type.
  87          * Ensure that a handler is not already installed.
  88          */
  89         if (device == ACPI_ROOT_OBJECT) {
  90                 for (i = 0; i < ACPI_NUM_NOTIFY_TYPES; i++) {
  91                         if (handler_type & (i + 1)) {
  92                                 if (acpi_gbl_global_notify[i].handler) {
  93                                         status = AE_ALREADY_EXISTS;
  94                                         goto unlock_and_exit;
  95                                 }
  96
  97                                 acpi_gbl_global_notify[i].handler = handler;
  98                                 acpi_gbl_global_notify[i].context = context;
  99                         }
 100                 }
 101
 102                 goto unlock_and_exit;   /* Global notify handler installed, all done */
 103         }
 104
 105         /*
 106          * All Other Objects:
 107          * Caller will only receive notifications specific to the target
 108          * object. Note that only certain object types are allowed to
 109          * receive notifications.
 110          */
 111
 112         /* Are Notifies allowed on this object? */
 113
 114         if (!acpi_ev_is_notify_object(node)) {
 115                 status = AE_TYPE;
 116                 goto unlock_and_exit;
 117         }
 118
 119         /* Check for an existing internal object, might not exist */
 120
 121         obj_desc = acpi_ns_get_attached_object(node);
 122         if (!obj_desc) {
 123
 124                 /* Create a new object */
 125
 126                 obj_desc = acpi_ut_create_internal_object(node->type);
 127                 if (!obj_desc) {
 128                         status = AE_NO_MEMORY;
 129                         goto unlock_and_exit;
 130                 }
 131
 132                 /* Attach new object to the Node, remove local reference */
 133
 134                 status = acpi_ns_attach_object(device, obj_desc, node->type);
 135                 acpi_ut_remove_reference(obj_desc);
 136                 if (ACPI_FAILURE(status)) {
 137                         goto unlock_and_exit;
 138                 }
 139         }
 140
 141         /* Ensure that the handler is not already installed in the lists */
 142
 143         for (i = 0; i < ACPI_NUM_NOTIFY_TYPES; i++) {
 144                 if (handler_type & (i + 1)) {
 145                         handler_obj = obj_desc->common_notify.notify_list[i];
 146                         while (handler_obj) {
 147                                 if (handler_obj->notify.handler == handler) {
 148                                         status = AE_ALREADY_EXISTS;
 149                                         goto unlock_and_exit;
 150                                 }
 151
 152                                 handler_obj = handler_obj->notify.next[i];
 153                         }
 154                 }
 155         }
 156
 157         /* Create and populate a new notify handler object */
 158
 159         handler_obj = acpi_ut_create_internal_object(ACPI_TYPE_LOCAL_NOTIFY);
 160         if (!handler_obj) {
 161                 status = AE_NO_MEMORY;
 162                 goto unlock_and_exit;
 163         }
 164
 165         handler_obj->notify.node = node;
 166         handler_obj->notify.handler_type = handler_type;
 167         handler_obj->notify.handler = handler;
 168         handler_obj->notify.context = context;
 169
 170         /* Install the handler at the list head(s) */
 171
 172         for (i = 0; i < ACPI_NUM_NOTIFY_TYPES; i++) {
 173                 if (handler_type & (i + 1)) {
 174                         handler_obj->notify.next[i] =
 175                             obj_desc->common_notify.notify_list[i];
 176
 177                         obj_desc->common_notify.notify_list[i] = handler_obj;
 178                 }
 179         }
 180
 181         /* Add an extra reference if handler was installed in both lists */
 182
 183         if (handler_type == ACPI_ALL_NOTIFY) {
 184                 acpi_ut_add_reference(handler_obj);
 185         }
 186
 187 unlock_and_exit:
 188         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 189         return_ACPI_STATUS(status);
 190 }
 191
 192 ACPI_EXPORT_SYMBOL(acpi_install_notify_handler)
 193
 194 /*******************************************************************************
 195  *
 196  * FUNCTION:    acpi_remove_notify_handler
 197  *
 198  * PARAMETERS:  device          - The device for which the handler is installed
 199  *              handler_type    - The type of handler:
 200  *                                  ACPI_SYSTEM_NOTIFY: System Handler (00-7F)
 201  *                                  ACPI_DEVICE_NOTIFY: Device Handler (80-FF)
 202  *                                  ACPI_ALL_NOTIFY:    Both System and Device
 203  *              handler         - Address of the handler
 204  *
 205  * RETURN:      Status
 206  *
 207  * DESCRIPTION: Remove a handler for notifies on an ACPI device
 208  *
 209  ******************************************************************************/
 210 acpi_status
 211 acpi_remove_notify_handler(acpi_handle device,
 212                            u32 handler_type, acpi_notify_handler handler)
 213 {
 214         struct acpi_namespace_node *node =
 215             ACPI_CAST_PTR(struct acpi_namespace_node, device);
 216         union acpi_operand_object *obj_desc;
 217         union acpi_operand_object *handler_obj;
 218         union acpi_operand_object *previous_handler_obj;
 219         acpi_status status = AE_OK;
 220         u32 i;
 221
 222         ACPI_FUNCTION_TRACE(acpi_remove_notify_handler);
 223
 224         /* Parameter validation */
 225
 226         if ((!device) || (!handler) || (!handler_type) ||
 227             (handler_type > ACPI_MAX_NOTIFY_HANDLER_TYPE)) {
 228                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 229         }
 230
 231         /* Root Object. Global handlers are removed here */
 232
 233         if (device == ACPI_ROOT_OBJECT) {
 234                 for (i = 0; i < ACPI_NUM_NOTIFY_TYPES; i++) {
 235                         if (handler_type & (i + 1)) {
 236                                 status =
 237                                     acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
 238                                 if (ACPI_FAILURE(status)) {
 239                                         return_ACPI_STATUS(status);
 240                                 }
 241
 242                                 if (!acpi_gbl_global_notify[i].handler ||
 243                                     (acpi_gbl_global_notify[i].handler !=
 244                                      handler)) {
 245                                         status = AE_NOT_EXIST;
 246                                         goto unlock_and_exit;
 247                                 }
 248
 249                                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 250                                                   "Removing global notify handler\n"));
 251
 252                                 acpi_gbl_global_notify[i].handler = NULL;
 253                                 acpi_gbl_global_notify[i].context = NULL;
 254
 255                                 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 256
 257                                 /* Make sure all deferred notify tasks are completed */
 258
 259                                 acpi_os_wait_events_complete();
 260                         }
 261                 }
 262
 263                 return_ACPI_STATUS(AE_OK);
 264         }
 265
 266         /* All other objects: Are Notifies allowed on this object? */
 267
 268         if (!acpi_ev_is_notify_object(node)) {
 269                 return_ACPI_STATUS(AE_TYPE);
 270         }
 271
 272         /* Must have an existing internal object */
 273
 274         obj_desc = acpi_ns_get_attached_object(node);
 275         if (!obj_desc) {
 276                 return_ACPI_STATUS(AE_NOT_EXIST);
 277         }
 278
 279         /* Internal object exists. Find the handler and remove it */
 280
 281         for (i = 0; i < ACPI_NUM_NOTIFY_TYPES; i++) {
 282                 if (handler_type & (i + 1)) {
 283                         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
 284                         if (ACPI_FAILURE(status)) {
 285                                 return_ACPI_STATUS(status);
 286                         }
 287
 288                         handler_obj = obj_desc->common_notify.notify_list[i];
 289                         previous_handler_obj = NULL;
 290
 291                         /* Attempt to find the handler in the handler list */
 292
 293                         while (handler_obj &&
 294                                (handler_obj->notify.handler != handler)) {
 295                                 previous_handler_obj = handler_obj;
 296                                 handler_obj = handler_obj->notify.next[i];
 297                         }
 298
 299                         if (!handler_obj) {
 300                                 status = AE_NOT_EXIST;
 301                                 goto unlock_and_exit;
 302                         }
 303
 304                         /* Remove the handler object from the list */
 305
 306                         if (previous_handler_obj) {     /* Handler is not at the list head */
 307                                 previous_handler_obj->notify.next[i] =
 308                                     handler_obj->notify.next[i];
 309                         } else {        /* Handler is at the list head */
 310
 311                                 obj_desc->common_notify.notify_list[i] =
 312                                     handler_obj->notify.next[i];
 313                         }
 314
 315                         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 316
 317                         /* Make sure all deferred notify tasks are completed */
 318
 319                         acpi_os_wait_events_complete();
 320                         acpi_ut_remove_reference(handler_obj);
 321                 }
 322         }
 323
 324         return_ACPI_STATUS(status);
 325
 326 unlock_and_exit:
 327         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 328         return_ACPI_STATUS(status);
 329 }
 330
 331 ACPI_EXPORT_SYMBOL(acpi_remove_notify_handler)
 332
 333 /*******************************************************************************
 334  *
 335  * FUNCTION:    acpi_install_exception_handler
 336  *
 337  * PARAMETERS:  handler         - Pointer to the handler function for the
 338  *                                event
 339  *
 340  * RETURN:      Status
 341  *
 342  * DESCRIPTION: Saves the pointer to the handler function
 343  *
 344  ******************************************************************************/
 345 #ifdef ACPI_FUTURE_USAGE
 346 acpi_status acpi_install_exception_handler(acpi_exception_handler handler)
 347 {
 348         acpi_status status;
 349
 350         ACPI_FUNCTION_TRACE(acpi_install_exception_handler);
 351
 352         status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
 353         if (ACPI_FAILURE(status)) {
 354                 return_ACPI_STATUS(status);
 355         }
 356
 357         /* Don't allow two handlers. */
 358
 359         if (acpi_gbl_exception_handler) {
 360                 status = AE_ALREADY_EXISTS;
 361                 goto cleanup;
 362         }
 363
 364         /* Install the handler */
 365
 366         acpi_gbl_exception_handler = handler;
 367
 368 cleanup:
 369         (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
 370         return_ACPI_STATUS(status);
 371 }
 372
 373 ACPI_EXPORT_SYMBOL(acpi_install_exception_handler)
 374 #endif
 375
 376 #if (!ACPI_REDUCED_HARDWARE)
 377 /*******************************************************************************
 378  *
 379  * FUNCTION:    acpi_install_sci_handler
 380  *
 381  * PARAMETERS:  address             - Address of the handler
 382  *              context             - Value passed to the handler on each SCI
 383  *
 384  * RETURN:      Status
 385  *
 386  * DESCRIPTION: Install a handler for a System Control Interrupt.
 387  *
 388  ******************************************************************************/
 389 acpi_status acpi_install_sci_handler(acpi_sci_handler address, void *context)
 390 {
 391         struct acpi_sci_handler_info *new_sci_handler;
 392         struct acpi_sci_handler_info *sci_handler;
 393         acpi_cpu_flags flags;
 394         acpi_status status;
 395
 396         ACPI_FUNCTION_TRACE(acpi_install_sci_handler);
 397
 398         if (!address) {
 399                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 400         }
 401
 402         /* Allocate and init a handler object */
 403
 404         new_sci_handler = ACPI_ALLOCATE(sizeof(struct acpi_sci_handler_info));
 405         if (!new_sci_handler) {
 406                 return_ACPI_STATUS(AE_NO_MEMORY);
 407         }
 408
 409         new_sci_handler->address = address;
 410         new_sci_handler->context = context;
 411
 412         status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
 413         if (ACPI_FAILURE(status)) {
 414                 goto exit;
 415         }
 416
 417         /* Lock list during installation */
 418
 419         flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
 420         sci_handler = acpi_gbl_sci_handler_list;
 421
 422         /* Ensure handler does not already exist */
 423
 424         while (sci_handler) {
 425                 if (address == sci_handler->address) {
 426                         status = AE_ALREADY_EXISTS;
 427                         goto unlock_and_exit;
 428                 }
 429
 430                 sci_handler = sci_handler->next;
 431         }
 432
 433         /* Install the new handler into the global list (at head) */
 434
 435         new_sci_handler->next = acpi_gbl_sci_handler_list;
 436         acpi_gbl_sci_handler_list = new_sci_handler;
 437
 438 unlock_and_exit:
 439
 440         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 441         (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
 442
 443 exit:
 444         if (ACPI_FAILURE(status)) {
 445                 ACPI_FREE(new_sci_handler);
 446         }
 447         return_ACPI_STATUS(status);
 448 }
 449
 450 ACPI_EXPORT_SYMBOL(acpi_install_sci_handler)
 451
 452 /*******************************************************************************
 453  *
 454  * FUNCTION:    acpi_remove_sci_handler
 455  *
 456  * PARAMETERS:  address             - Address of the handler
 457  *
 458  * RETURN:      Status
 459  *
 460  * DESCRIPTION: Remove a handler for a System Control Interrupt.
 461  *
 462  ******************************************************************************/
 463 acpi_status acpi_remove_sci_handler(acpi_sci_handler address)
 464 {
 465         struct acpi_sci_handler_info *prev_sci_handler;
 466         struct acpi_sci_handler_info *next_sci_handler;
 467         acpi_cpu_flags flags;
 468         acpi_status status;
 469
 470         ACPI_FUNCTION_TRACE(acpi_remove_sci_handler);
 471
 472         if (!address) {
 473                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 474         }
 475
 476         status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
 477         if (ACPI_FAILURE(status)) {
 478                 return_ACPI_STATUS(status);
 479         }
 480
 481         /* Remove the SCI handler with lock */
 482
 483         flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
 484
 485         prev_sci_handler = NULL;
 486         next_sci_handler = acpi_gbl_sci_handler_list;
 487         while (next_sci_handler) {
 488                 if (next_sci_handler->address == address) {
 489
 490                         /* Unlink and free the SCI handler info block */
 491
 492                         if (prev_sci_handler) {
 493                                 prev_sci_handler->next = next_sci_handler->next;
 494                         } else {
 495                                 acpi_gbl_sci_handler_list =
 496                                     next_sci_handler->next;
 497                         }
 498
 499                         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 500                         ACPI_FREE(next_sci_handler);
 501                         goto unlock_and_exit;
 502                 }
 503
 504                 prev_sci_handler = next_sci_handler;
 505                 next_sci_handler = next_sci_handler->next;
 506         }
 507
 508         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 509         status = AE_NOT_EXIST;
 510
 511 unlock_and_exit:
 512         (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
 513         return_ACPI_STATUS(status);
 514 }
 515
 516 ACPI_EXPORT_SYMBOL(acpi_remove_sci_handler)
 517
 518 /*******************************************************************************
 519  *
 520  * FUNCTION:    acpi_install_global_event_handler
 521  *
 522  * PARAMETERS:  handler         - Pointer to the global event handler function
 523  *              context         - Value passed to the handler on each event
 524  *
 525  * RETURN:      Status
 526  *
 527  * DESCRIPTION: Saves the pointer to the handler function. The global handler
 528  *              is invoked upon each incoming GPE and Fixed Event. It is
 529  *              invoked at interrupt level at the time of the event dispatch.
 530  *              Can be used to update event counters, etc.
 531  *
 532  ******************************************************************************/
 533 acpi_status
 534 acpi_install_global_event_handler(acpi_gbl_event_handler handler, void *context)
 535 {
 536         acpi_status status;
 537
 538         ACPI_FUNCTION_TRACE(acpi_install_global_event_handler);
 539
 540         /* Parameter validation */
 541
 542         if (!handler) {
 543                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 544         }
 545
 546         status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
 547         if (ACPI_FAILURE(status)) {
 548                 return_ACPI_STATUS(status);
 549         }
 550
 551         /* Don't allow two handlers. */
 552
 553         if (acpi_gbl_global_event_handler) {
 554                 status = AE_ALREADY_EXISTS;
 555                 goto cleanup;
 556         }
 557
 558         acpi_gbl_global_event_handler = handler;
 559         acpi_gbl_global_event_handler_context = context;
 560
 561 cleanup:
 562         (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
 563         return_ACPI_STATUS(status);
 564 }
 565
 566 ACPI_EXPORT_SYMBOL(acpi_install_global_event_handler)
 567
 568 /*******************************************************************************
 569  *
 570  * FUNCTION:    acpi_install_fixed_event_handler
 571  *
 572  * PARAMETERS:  event           - Event type to enable.
 573  *              handler         - Pointer to the handler function for the
 574  *                                event
 575  *              context         - Value passed to the handler on each GPE
 576  *
 577  * RETURN:      Status
 578  *
 579  * DESCRIPTION: Saves the pointer to the handler function and then enables the
 580  *              event.
 581  *
 582  ******************************************************************************/
 583 acpi_status
 584 acpi_install_fixed_event_handler(u32 event,
 585                                  acpi_event_handler handler, void *context)
 586 {
 587         acpi_status status;
 588
 589         ACPI_FUNCTION_TRACE(acpi_install_fixed_event_handler);
 590
 591         /* Parameter validation */
 592
 593         if (event > ACPI_EVENT_MAX) {
 594                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 595         }
 596
 597         status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
 598         if (ACPI_FAILURE(status)) {
 599                 return_ACPI_STATUS(status);
 600         }
 601
 602         /* Do not allow multiple handlers */
 603
 604         if (acpi_gbl_fixed_event_handlers[event].handler) {
 605                 status = AE_ALREADY_EXISTS;
 606                 goto cleanup;
 607         }
 608
 609         /* Install the handler before enabling the event */
 610
 611         acpi_gbl_fixed_event_handlers[event].handler = handler;
 612         acpi_gbl_fixed_event_handlers[event].context = context;
 613
 614         status = acpi_clear_event(event);
 615         if (ACPI_SUCCESS(status))
 616                 status = acpi_enable_event(event, 0);
 617         if (ACPI_FAILURE(status)) {
 618                 ACPI_WARNING((AE_INFO,
 619                               "Could not enable fixed event - %s (%u)",
 620                               acpi_ut_get_event_name(event), event));
 621
 622                 /* Remove the handler */
 623
 624                 acpi_gbl_fixed_event_handlers[event].handler = NULL;
 625                 acpi_gbl_fixed_event_handlers[event].context = NULL;
 626         } else {
 627                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 628                                   "Enabled fixed event %s (%X), Handler=%p\n",
 629                                   acpi_ut_get_event_name(event), event,
 630                                   handler));
 631         }
 632
 633 cleanup:
 634         (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
 635         return_ACPI_STATUS(status);
 636 }
 637
 638 ACPI_EXPORT_SYMBOL(acpi_install_fixed_event_handler)
 639
 640 /*******************************************************************************
 641  *
 642  * FUNCTION:    acpi_remove_fixed_event_handler
 643  *
 644  * PARAMETERS:  event           - Event type to disable.
 645  *              handler         - Address of the handler
 646  *
 647  * RETURN:      Status
 648  *
 649  * DESCRIPTION: Disables the event and unregisters the event handler.
 650  *
 651  ******************************************************************************/
 652 acpi_status
 653 acpi_remove_fixed_event_handler(u32 event, acpi_event_handler handler)
 654 {
 655         acpi_status status = AE_OK;
 656
 657         ACPI_FUNCTION_TRACE(acpi_remove_fixed_event_handler);
 658
 659         /* Parameter validation */
 660
 661         if (event > ACPI_EVENT_MAX) {
 662                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 663         }
 664
 665         status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
 666         if (ACPI_FAILURE(status)) {
 667                 return_ACPI_STATUS(status);
 668         }
 669
 670         /* Disable the event before removing the handler */
 671
 672         status = acpi_disable_event(event, 0);
 673
 674         /* Always Remove the handler */
 675
 676         acpi_gbl_fixed_event_handlers[event].handler = NULL;
 677         acpi_gbl_fixed_event_handlers[event].context = NULL;
 678
 679         if (ACPI_FAILURE(status)) {
 680                 ACPI_WARNING((AE_INFO,
 681                               "Could not disable fixed event - %s (%u)",
 682                               acpi_ut_get_event_name(event), event));
 683         } else {
 684                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 685                                   "Disabled fixed event - %s (%X)\n",
 686                                   acpi_ut_get_event_name(event), event));
 687         }
 688
 689         (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
 690         return_ACPI_STATUS(status);
 691 }
 692
 693 ACPI_EXPORT_SYMBOL(acpi_remove_fixed_event_handler)
 694
 695 /*******************************************************************************
 696  *
 697  * FUNCTION:    acpi_ev_install_gpe_handler
 698  *
 699  * PARAMETERS:  gpe_device      - Namespace node for the GPE (NULL for FADT
 700  *                                defined GPEs)
 701  *              gpe_number      - The GPE number within the GPE block
 702  *              type            - Whether this GPE should be treated as an
 703  *                                edge- or level-triggered interrupt.
 704  *              is_raw_handler  - Whether this GPE should be handled using
 705  *                                the special GPE handler mode.
 706  *              address         - Address of the handler
 707  *              context         - Value passed to the handler on each GPE
 708  *
 709  * RETURN:      Status
 710  *
 711  * DESCRIPTION: Internal function to install a handler for a General Purpose
 712  *              Event.
 713  *
 714  ******************************************************************************/
 715 static acpi_status
 716 acpi_ev_install_gpe_handler(acpi_handle gpe_device,
 717                             u32 gpe_number,
 718                             u32 type,
 719                             u8 is_raw_handler,
 720                             acpi_gpe_handler address, void *context)
 721 {
 722         struct acpi_gpe_event_info *gpe_event_info;
 723         struct acpi_gpe_handler_info *handler;
 724         acpi_status status;
 725         acpi_cpu_flags flags;
 726
 727         ACPI_FUNCTION_TRACE(ev_install_gpe_handler);
 728
 729         /* Parameter validation */
 730
 731         if ((!address) || (type & ~ACPI_GPE_XRUPT_TYPE_MASK)) {
 732                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 733         }
 734
 735         status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
 736         if (ACPI_FAILURE(status)) {
 737                 return_ACPI_STATUS(status);
 738         }
 739
 740         /* Allocate and init handler object (before lock) */
 741
 742         handler = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_gpe_handler_info));
 743         if (!handler) {
 744                 status = AE_NO_MEMORY;
 745                 goto unlock_and_exit;
 746         }
 747
 748         flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
 749
 750         /* Ensure that we have a valid GPE number */
 751
 752         gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
 753         if (!gpe_event_info) {
 754                 status = AE_BAD_PARAMETER;
 755                 goto free_and_exit;
 756         }
 757
 758         /* Make sure that there isn't a handler there already */
 759
 760         if ((ACPI_GPE_DISPATCH_TYPE(gpe_event_info->flags) ==
 761              ACPI_GPE_DISPATCH_HANDLER) ||
 762             (ACPI_GPE_DISPATCH_TYPE(gpe_event_info->flags) ==
 763              ACPI_GPE_DISPATCH_RAW_HANDLER)) {
 764                 status = AE_ALREADY_EXISTS;
 765                 goto free_and_exit;
 766         }
 767
 768         handler->address = address;
 769         handler->context = context;
 770         handler->method_node = gpe_event_info->dispatch.method_node;
 771         handler->original_flags = (u8)(gpe_event_info->flags &
 772                                        (ACPI_GPE_XRUPT_TYPE_MASK |
 773                                         ACPI_GPE_DISPATCH_MASK));
 774
 775         /*
 776          * If the GPE is associated with a method, it may have been enabled
 777          * automatically during initialization, in which case it has to be
 778          * disabled now to avoid spurious execution of the handler.
 779          */
 780         if (((ACPI_GPE_DISPATCH_TYPE(handler->original_flags) ==
 781               ACPI_GPE_DISPATCH_METHOD) ||
 782              (ACPI_GPE_DISPATCH_TYPE(handler->original_flags) ==
 783               ACPI_GPE_DISPATCH_NOTIFY)) && gpe_event_info->runtime_count) {
 784                 handler->originally_enabled = TRUE;
 785                 (void)acpi_ev_remove_gpe_reference(gpe_event_info);
 786
 787                 /* Sanity check of original type against new type */
 788
 789                 if (type !=
 790                     (u32)(gpe_event_info->flags & ACPI_GPE_XRUPT_TYPE_MASK)) {
 791                         ACPI_WARNING((AE_INFO,
 792                                       "GPE type mismatch (level/edge)"));
 793                 }
 794         }
 795
 796         /* Install the handler */
 797
 798         gpe_event_info->dispatch.handler = handler;
 799
 800         /* Setup up dispatch flags to indicate handler (vs. method/notify) */
 801
 802         gpe_event_info->flags &=
 803             ~(ACPI_GPE_XRUPT_TYPE_MASK | ACPI_GPE_DISPATCH_MASK);
 804         gpe_event_info->flags |=
 805             (u8)(type |
 806                  (is_raw_handler ? ACPI_GPE_DISPATCH_RAW_HANDLER :
 807                   ACPI_GPE_DISPATCH_HANDLER));
 808
 809         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 810
 811 unlock_and_exit:
 812         (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
 813         return_ACPI_STATUS(status);
 814
 815 free_and_exit:
 816         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 817         ACPI_FREE(handler);
 818         goto unlock_and_exit;
 819 }
 820
 821 /*******************************************************************************
 822  *
 823  * FUNCTION:    acpi_install_gpe_handler
 824  *
 825  * PARAMETERS:  gpe_device      - Namespace node for the GPE (NULL for FADT
 826  *                                defined GPEs)
 827  *              gpe_number      - The GPE number within the GPE block
 828  *              type            - Whether this GPE should be treated as an
 829  *                                edge- or level-triggered interrupt.
 830  *              address         - Address of the handler
 831  *              context         - Value passed to the handler on each GPE
 832  *
 833  * RETURN:      Status
 834  *
 835  * DESCRIPTION: Install a handler for a General Purpose Event.
 836  *
 837  ******************************************************************************/
 838
 839 acpi_status
 840 acpi_install_gpe_handler(acpi_handle gpe_device,
 841                          u32 gpe_number,
 842                          u32 type, acpi_gpe_handler address, void *context)
 843 {
 844         acpi_status status;
 845
 846         ACPI_FUNCTION_TRACE(acpi_install_gpe_handler);
 847
 848         status = acpi_ev_install_gpe_handler(gpe_device, gpe_number, type,
 849                                              FALSE, address, context);
 850
 851         return_ACPI_STATUS(status);
 852 }
 853
 854 ACPI_EXPORT_SYMBOL(acpi_install_gpe_handler)
 855
 856 /*******************************************************************************
 857  *
 858  * FUNCTION:    acpi_install_gpe_raw_handler
 859  *
 860  * PARAMETERS:  gpe_device      - Namespace node for the GPE (NULL for FADT
 861  *                                defined GPEs)
 862  *              gpe_number      - The GPE number within the GPE block
 863  *              type            - Whether this GPE should be treated as an
 864  *                                edge- or level-triggered interrupt.
 865  *              address         - Address of the handler
 866  *              context         - Value passed to the handler on each GPE
 867  *
 868  * RETURN:      Status
 869  *
 870  * DESCRIPTION: Install a handler for a General Purpose Event.
 871  *
 872  ******************************************************************************/
 873 acpi_status
 874 acpi_install_gpe_raw_handler(acpi_handle gpe_device,
 875                              u32 gpe_number,
 876                              u32 type, acpi_gpe_handler address, void *context)
 877 {
 878         acpi_status status;
 879
 880         ACPI_FUNCTION_TRACE(acpi_install_gpe_raw_handler);
 881
 882         status = acpi_ev_install_gpe_handler(gpe_device, gpe_number, type,
 883                                              TRUE, address, context);
 884
 885         return_ACPI_STATUS(status);
 886 }
 887
 888 ACPI_EXPORT_SYMBOL(acpi_install_gpe_raw_handler)
 889
 890 /*******************************************************************************
 891  *
 892  * FUNCTION:    acpi_remove_gpe_handler
 893  *
 894  * PARAMETERS:  gpe_device      - Namespace node for the GPE (NULL for FADT
 895  *                                defined GPEs)
 896  *              gpe_number      - The event to remove a handler
 897  *              address         - Address of the handler
 898  *
 899  * RETURN:      Status
 900  *
 901  * DESCRIPTION: Remove a handler for a General Purpose acpi_event.
 902  *
 903  ******************************************************************************/
 904 acpi_status
 905 acpi_remove_gpe_handler(acpi_handle gpe_device,
 906                         u32 gpe_number, acpi_gpe_handler address)
 907 {
 908         struct acpi_gpe_event_info *gpe_event_info;
 909         struct acpi_gpe_handler_info *handler;
 910         acpi_status status;
 911         acpi_cpu_flags flags;
 912
 913         ACPI_FUNCTION_TRACE(acpi_remove_gpe_handler);
 914
 915         /* Parameter validation */
 916
 917         if (!address) {
 918                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 919         }
 920
 921         status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
 922         if (ACPI_FAILURE(status)) {
 923                 return_ACPI_STATUS(status);
 924         }
 925
 926         flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
 927
 928         /* Ensure that we have a valid GPE number */
 929
 930         gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
 931         if (!gpe_event_info) {
 932                 status = AE_BAD_PARAMETER;
 933                 goto unlock_and_exit;
 934         }
 935
 936         /* Make sure that a handler is indeed installed */
 937
 938         if ((ACPI_GPE_DISPATCH_TYPE(gpe_event_info->flags) !=
 939              ACPI_GPE_DISPATCH_HANDLER) &&
 940             (ACPI_GPE_DISPATCH_TYPE(gpe_event_info->flags) !=
 941              ACPI_GPE_DISPATCH_RAW_HANDLER)) {
 942                 status = AE_NOT_EXIST;
 943                 goto unlock_and_exit;
 944         }
 945
 946         /* Make sure that the installed handler is the same */
 947
 948         if (gpe_event_info->dispatch.handler->address != address) {
 949                 status = AE_BAD_PARAMETER;
 950                 goto unlock_and_exit;
 951         }
 952
 953         /* Remove the handler */
 954
 955         handler = gpe_event_info->dispatch.handler;
 956         gpe_event_info->dispatch.handler = NULL;
 957
 958         /* Restore Method node (if any), set dispatch flags */
 959
 960         gpe_event_info->dispatch.method_node = handler->method_node;
 961         gpe_event_info->flags &=
 962             ~(ACPI_GPE_XRUPT_TYPE_MASK | ACPI_GPE_DISPATCH_MASK);
 963         gpe_event_info->flags |= handler->original_flags;
 964
 965         /*
 966          * If the GPE was previously associated with a method and it was
 967          * enabled, it should be enabled at this point to restore the
 968          * post-initialization configuration.
 969          */
 970         if (((ACPI_GPE_DISPATCH_TYPE(handler->original_flags) ==
 971               ACPI_GPE_DISPATCH_METHOD) ||
 972              (ACPI_GPE_DISPATCH_TYPE(handler->original_flags) ==
 973               ACPI_GPE_DISPATCH_NOTIFY)) && handler->originally_enabled) {
 974                 (void)acpi_ev_add_gpe_reference(gpe_event_info, FALSE);
 975                 if (ACPI_GPE_IS_POLLING_NEEDED(gpe_event_info)) {
 976
 977                         /* Poll edge triggered GPEs to handle existing events */
 978
 979                         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 980                         (void)acpi_ev_detect_gpe(gpe_device, gpe_event_info,
 981                                                  gpe_number);
 982                         flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
 983                 }
 984         }
 985
 986         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 987         (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
 988
 989         /* Make sure all deferred GPE tasks are completed */
 990
 991         acpi_os_wait_events_complete();
 992
 993         /* Now we can free the handler object */
 994
 995         ACPI_FREE(handler);
 996         return_ACPI_STATUS(status);
 997
 998 unlock_and_exit:
 999         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
1000
1001         (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
1002         return_ACPI_STATUS(status);
1003 }
1004
1005 ACPI_EXPORT_SYMBOL(acpi_remove_gpe_handler)
1006
1007 /*******************************************************************************
1008  *
1009  * FUNCTION:    acpi_acquire_global_lock
1010  *
1011  * PARAMETERS:  timeout         - How long the caller is willing to wait
1012  *              handle          - Where the handle to the lock is returned
1013  *                                (if acquired)
1014  *
1015  * RETURN:      Status
1016  *
1017  * DESCRIPTION: Acquire the ACPI Global Lock
1018  *
1019  * Note: Allows callers with the same thread ID to acquire the global lock
1020  * multiple times. In other words, externally, the behavior of the global lock
1021  * is identical to an AML mutex. On the first acquire, a new handle is
1022  * returned. On any subsequent calls to acquire by the same thread, the same
1023  * handle is returned.
1024  *
1025  ******************************************************************************/
1026 acpi_status acpi_acquire_global_lock(u16 timeout, u32 *handle)
1027 {
1028         acpi_status status;
1029
1030         if (!handle) {
1031                 return (AE_BAD_PARAMETER);
1032         }
1033
1034         /* Must lock interpreter to prevent race conditions */
1035
1036         acpi_ex_enter_interpreter();
1037
1038         status = acpi_ex_acquire_mutex_object(timeout,
1039                                               acpi_gbl_global_lock_mutex,
1040                                               acpi_os_get_thread_id());
1041
1042         if (ACPI_SUCCESS(status)) {
1043
1044                 /* Return the global lock handle (updated in acpi_ev_acquire_global_lock) */
1045
1046                 *handle = acpi_gbl_global_lock_handle;
1047         }
1048
1049         acpi_ex_exit_interpreter();
1050         return (status);
1051 }
1052
1053 ACPI_EXPORT_SYMBOL(acpi_acquire_global_lock)
1054
1055 /*******************************************************************************
1056  *
1057  * FUNCTION:    acpi_release_global_lock
1058  *
1059  * PARAMETERS:  handle      - Returned from acpi_acquire_global_lock
1060  *
1061  * RETURN:      Status
1062  *
1063  * DESCRIPTION: Release the ACPI Global Lock. The handle must be valid.
1064  *
1065  ******************************************************************************/
1066 acpi_status acpi_release_global_lock(u32 handle)
1067 {
1068         acpi_status status;
1069
1070         if (!handle || (handle != acpi_gbl_global_lock_handle)) {
1071                 return (AE_NOT_ACQUIRED);
1072         }
1073
1074         status = acpi_ex_release_mutex_object(acpi_gbl_global_lock_mutex);
1075         return (status);
1076 }
1077
1078 ACPI_EXPORT_SYMBOL(acpi_release_global_lock)
1079 #endif                          /* !ACPI_REDUCED_HARDWARE */