drivers/acpi/events/evxface.c

   1 /******************************************************************************
   2  *
   3  * Module Name: evxface - External interfaces for ACPI events
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2004, 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
  45 #include <acpi/acpi.h>
  46 #include <acpi/acnamesp.h>
  47 #include <acpi/acevents.h>
  48 #include <acpi/acinterp.h>
  49
  50 #define _COMPONENT          ACPI_EVENTS
  51          ACPI_MODULE_NAME    ("evxface")
  52
  53
  54 /*******************************************************************************
  55  *
  56  * FUNCTION:    acpi_install_fixed_event_handler
  57  *
  58  * PARAMETERS:  Event           - Event type to enable.
  59  *              Handler         - Pointer to the handler function for the
  60  *                                event
  61  *              Context         - Value passed to the handler on each GPE
  62  *
  63  * RETURN:      Status
  64  *
  65  * DESCRIPTION: Saves the pointer to the handler function and then enables the
  66  *              event.
  67  *
  68  ******************************************************************************/
  69
  70 acpi_status
  71 acpi_install_fixed_event_handler (
  72         u32                             event,
  73         acpi_event_handler              handler,
  74         void                            *context)
  75 {
  76         acpi_status                     status;
  77
  78
  79         ACPI_FUNCTION_TRACE ("acpi_install_fixed_event_handler");
  80
  81
  82         /* Parameter validation */
  83
  84         if (event > ACPI_EVENT_MAX) {
  85                 return_ACPI_STATUS (AE_BAD_PARAMETER);
  86         }
  87
  88         status = acpi_ut_acquire_mutex (ACPI_MTX_EVENTS);
  89         if (ACPI_FAILURE (status)) {
  90                 return_ACPI_STATUS (status);
  91         }
  92
  93         /* Don't allow two handlers. */
  94
  95         if (NULL != acpi_gbl_fixed_event_handlers[event].handler) {
  96                 status = AE_ALREADY_EXISTS;
  97                 goto cleanup;
  98         }
  99
 100         /* Install the handler before enabling the event */
 101
 102         acpi_gbl_fixed_event_handlers[event].handler = handler;
 103         acpi_gbl_fixed_event_handlers[event].context = context;
 104
 105         status = acpi_enable_event (event, 0);
 106         if (ACPI_FAILURE (status)) {
 107                 ACPI_DEBUG_PRINT ((ACPI_DB_WARN, "Could not enable fixed event.\n"));
 108
 109                 /* Remove the handler */
 110
 111                 acpi_gbl_fixed_event_handlers[event].handler = NULL;
 112                 acpi_gbl_fixed_event_handlers[event].context = NULL;
 113         }
 114         else {
 115                 ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
 116                         "Enabled fixed event %X, Handler=%p\n", event, handler));
 117         }
 118
 119
 120 cleanup:
 121         (void) acpi_ut_release_mutex (ACPI_MTX_EVENTS);
 122         return_ACPI_STATUS (status);
 123 }
 124
 125
 126 /*******************************************************************************
 127  *
 128  * FUNCTION:    acpi_remove_fixed_event_handler
 129  *
 130  * PARAMETERS:  Event           - Event type to disable.
 131  *              Handler         - Address of the handler
 132  *
 133  * RETURN:      Status
 134  *
 135  * DESCRIPTION: Disables the event and unregisters the event handler.
 136  *
 137  ******************************************************************************/
 138
 139 acpi_status
 140 acpi_remove_fixed_event_handler (
 141         u32                             event,
 142         acpi_event_handler              handler)
 143 {
 144         acpi_status                     status = AE_OK;
 145
 146
 147         ACPI_FUNCTION_TRACE ("acpi_remove_fixed_event_handler");
 148
 149
 150         /* Parameter validation */
 151
 152         if (event > ACPI_EVENT_MAX) {
 153                 return_ACPI_STATUS (AE_BAD_PARAMETER);
 154         }
 155
 156         status = acpi_ut_acquire_mutex (ACPI_MTX_EVENTS);
 157         if (ACPI_FAILURE (status)) {
 158                 return_ACPI_STATUS (status);
 159         }
 160
 161         /* Disable the event before removing the handler */
 162
 163         status = acpi_disable_event (event, 0);
 164
 165         /* Always Remove the handler */
 166
 167         acpi_gbl_fixed_event_handlers[event].handler = NULL;
 168         acpi_gbl_fixed_event_handlers[event].context = NULL;
 169
 170         if (ACPI_FAILURE (status)) {
 171                 ACPI_DEBUG_PRINT ((ACPI_DB_WARN,
 172                         "Could not write to fixed event enable register.\n"));
 173         }
 174         else {
 175                 ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Disabled fixed event %X.\n", event));
 176         }
 177
 178         (void) acpi_ut_release_mutex (ACPI_MTX_EVENTS);
 179         return_ACPI_STATUS (status);
 180 }
 181
 182
 183 /*******************************************************************************
 184  *
 185  * FUNCTION:    acpi_install_notify_handler
 186  *
 187  * PARAMETERS:  Device          - The device for which notifies will be handled
 188  *              handler_type    - The type of handler:
 189  *                                  ACPI_SYSTEM_NOTIFY: system_handler (00-7f)
 190  *                                  ACPI_DEVICE_NOTIFY: driver_handler (80-ff)
 191  *              Handler         - Address of the handler
 192  *              Context         - Value passed to the handler on each GPE
 193  *
 194  * RETURN:      Status
 195  *
 196  * DESCRIPTION: Install a handler for notifies on an ACPI device
 197  *
 198  ******************************************************************************/
 199
 200 acpi_status
 201 acpi_install_notify_handler (
 202         acpi_handle                     device,
 203         u32                             handler_type,
 204         acpi_notify_handler             handler,
 205         void                            *context)
 206 {
 207         union acpi_operand_object       *obj_desc;
 208         union acpi_operand_object       *notify_obj;
 209         struct acpi_namespace_node      *node;
 210         acpi_status                     status;
 211
 212
 213         ACPI_FUNCTION_TRACE ("acpi_install_notify_handler");
 214
 215
 216         /* Parameter validation */
 217
 218         if ((!device)  ||
 219                 (!handler) ||
 220                 (handler_type > ACPI_MAX_NOTIFY_HANDLER_TYPE)) {
 221                 return_ACPI_STATUS (AE_BAD_PARAMETER);
 222         }
 223
 224         status = acpi_ut_acquire_mutex (ACPI_MTX_NAMESPACE);
 225         if (ACPI_FAILURE (status)) {
 226                 return_ACPI_STATUS (status);
 227         }
 228
 229         /* Convert and validate the device handle */
 230
 231         node = acpi_ns_map_handle_to_node (device);
 232         if (!node) {
 233                 status = AE_BAD_PARAMETER;
 234                 goto unlock_and_exit;
 235         }
 236
 237         /*
 238          * Root Object:
 239          * Registering a notify handler on the root object indicates that the
 240          * caller wishes to receive notifications for all objects.  Note that
 241          * only one <external> global handler can be regsitered (per notify type).
 242          */
 243         if (device == ACPI_ROOT_OBJECT) {
 244                 /* Make sure the handler is not already installed */
 245
 246                 if (((handler_type == ACPI_SYSTEM_NOTIFY) &&
 247                                 acpi_gbl_system_notify.handler)        ||
 248                         ((handler_type == ACPI_DEVICE_NOTIFY) &&
 249                                 acpi_gbl_device_notify.handler)) {
 250                         status = AE_ALREADY_EXISTS;
 251                         goto unlock_and_exit;
 252                 }
 253
 254                 if (handler_type == ACPI_SYSTEM_NOTIFY) {
 255                         acpi_gbl_system_notify.node  = node;
 256                         acpi_gbl_system_notify.handler = handler;
 257                         acpi_gbl_system_notify.context = context;
 258                 }
 259                 else /* ACPI_DEVICE_NOTIFY */ {
 260                         acpi_gbl_device_notify.node  = node;
 261                         acpi_gbl_device_notify.handler = handler;
 262                         acpi_gbl_device_notify.context = context;
 263                 }
 264
 265                 /* Global notify handler installed */
 266         }
 267
 268         /*
 269          * All Other Objects:
 270          * Caller will only receive notifications specific to the target object.
 271          * Note that only certain object types can receive notifications.
 272          */
 273         else {
 274                 /* Notifies allowed on this object? */
 275
 276                 if (!acpi_ev_is_notify_object (node)) {
 277                         status = AE_TYPE;
 278                         goto unlock_and_exit;
 279                 }
 280
 281                 /* Check for an existing internal object */
 282
 283                 obj_desc = acpi_ns_get_attached_object (node);
 284                 if (obj_desc) {
 285                         /* Object exists - make sure there's no handler */
 286
 287                         if (((handler_type == ACPI_SYSTEM_NOTIFY) &&
 288                                         obj_desc->common_notify.system_notify) ||
 289                                 ((handler_type == ACPI_DEVICE_NOTIFY) &&
 290                                         obj_desc->common_notify.device_notify)) {
 291                                 status = AE_ALREADY_EXISTS;
 292                                 goto unlock_and_exit;
 293                         }
 294                 }
 295                 else {
 296                         /* Create a new object */
 297
 298                         obj_desc = acpi_ut_create_internal_object (node->type);
 299                         if (!obj_desc) {
 300                                 status = AE_NO_MEMORY;
 301                                 goto unlock_and_exit;
 302                         }
 303
 304                         /* Attach new object to the Node */
 305
 306                         status = acpi_ns_attach_object (device, obj_desc, node->type);
 307
 308                         /* Remove local reference to the object */
 309
 310                         acpi_ut_remove_reference (obj_desc);
 311
 312                         if (ACPI_FAILURE (status)) {
 313                                 goto unlock_and_exit;
 314                         }
 315                 }
 316
 317                 /* Install the handler */
 318
 319                 notify_obj = acpi_ut_create_internal_object (ACPI_TYPE_LOCAL_NOTIFY);
 320                 if (!notify_obj) {
 321                         status = AE_NO_MEMORY;
 322                         goto unlock_and_exit;
 323                 }
 324
 325                 notify_obj->notify.node   = node;
 326                 notify_obj->notify.handler = handler;
 327                 notify_obj->notify.context = context;
 328
 329                 if (handler_type == ACPI_SYSTEM_NOTIFY) {
 330                         obj_desc->common_notify.system_notify = notify_obj;
 331                 }
 332                 else /* ACPI_DEVICE_NOTIFY */ {
 333                         obj_desc->common_notify.device_notify = notify_obj;
 334                 }
 335         }
 336
 337
 338 unlock_and_exit:
 339         (void) acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);
 340         return_ACPI_STATUS (status);
 341 }
 342
 343
 344 /*******************************************************************************
 345  *
 346  * FUNCTION:    acpi_remove_notify_handler
 347  *
 348  * PARAMETERS:  Device          - The device for which notifies will be handled
 349  *              handler_type    - The type of handler:
 350  *                                  ACPI_SYSTEM_NOTIFY: system_handler (00-7f)
 351  *                                  ACPI_DEVICE_NOTIFY: driver_handler (80-ff)
 352  *              Handler         - Address of the handler
 353  * RETURN:      Status
 354  *
 355  * DESCRIPTION: Remove a handler for notifies on an ACPI device
 356  *
 357  ******************************************************************************/
 358
 359 acpi_status
 360 acpi_remove_notify_handler (
 361         acpi_handle                     device,
 362         u32                             handler_type,
 363         acpi_notify_handler             handler)
 364 {
 365         union acpi_operand_object       *notify_obj;
 366         union acpi_operand_object       *obj_desc;
 367         struct acpi_namespace_node      *node;
 368         acpi_status                     status;
 369
 370
 371         ACPI_FUNCTION_TRACE ("acpi_remove_notify_handler");
 372
 373
 374         /* Parameter validation */
 375
 376         if ((!device)  ||
 377                 (!handler) ||
 378                 (handler_type > ACPI_MAX_NOTIFY_HANDLER_TYPE)) {
 379                 return_ACPI_STATUS (AE_BAD_PARAMETER);
 380         }
 381
 382         status = acpi_ut_acquire_mutex (ACPI_MTX_NAMESPACE);
 383         if (ACPI_FAILURE (status)) {
 384                 return_ACPI_STATUS (status);
 385         }
 386
 387         /* Convert and validate the device handle */
 388
 389         node = acpi_ns_map_handle_to_node (device);
 390         if (!node) {
 391                 status = AE_BAD_PARAMETER;
 392                 goto unlock_and_exit;
 393         }
 394
 395         /*
 396          * Root Object
 397          */
 398         if (device == ACPI_ROOT_OBJECT) {
 399                 ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Removing notify handler for ROOT object.\n"));
 400
 401                 if (((handler_type == ACPI_SYSTEM_NOTIFY) &&
 402                           !acpi_gbl_system_notify.handler) ||
 403                         ((handler_type == ACPI_DEVICE_NOTIFY) &&
 404                           !acpi_gbl_device_notify.handler)) {
 405                         status = AE_NOT_EXIST;
 406                         goto unlock_and_exit;
 407                 }
 408
 409                 if (handler_type == ACPI_SYSTEM_NOTIFY) {
 410                         acpi_gbl_system_notify.node  = NULL;
 411                         acpi_gbl_system_notify.handler = NULL;
 412                         acpi_gbl_system_notify.context = NULL;
 413                 }
 414                 else {
 415                         acpi_gbl_device_notify.node  = NULL;
 416                         acpi_gbl_device_notify.handler = NULL;
 417                         acpi_gbl_device_notify.context = NULL;
 418                 }
 419         }
 420
 421         /*
 422          * All Other Objects
 423          */
 424         else {
 425                 /* Notifies allowed on this object? */
 426
 427                 if (!acpi_ev_is_notify_object (node)) {
 428                         status = AE_TYPE;
 429                         goto unlock_and_exit;
 430                 }
 431
 432                 /* Check for an existing internal object */
 433
 434                 obj_desc = acpi_ns_get_attached_object (node);
 435                 if (!obj_desc) {
 436                         status = AE_NOT_EXIST;
 437                         goto unlock_and_exit;
 438                 }
 439
 440                 /* Object exists - make sure there's an existing handler */
 441
 442                 if (handler_type == ACPI_SYSTEM_NOTIFY) {
 443                         notify_obj = obj_desc->common_notify.system_notify;
 444                 }
 445                 else {
 446                         notify_obj = obj_desc->common_notify.device_notify;
 447                 }
 448
 449                 if ((!notify_obj) ||
 450                         (notify_obj->notify.handler != handler)) {
 451                         status = AE_BAD_PARAMETER;
 452                         goto unlock_and_exit;
 453                 }
 454
 455                 /* Remove the handler */
 456
 457                 if (handler_type == ACPI_SYSTEM_NOTIFY) {
 458                         obj_desc->common_notify.system_notify = NULL;
 459                 }
 460                 else {
 461                         obj_desc->common_notify.device_notify = NULL;
 462                 }
 463
 464                 acpi_ut_remove_reference (notify_obj);
 465         }
 466
 467
 468 unlock_and_exit:
 469         (void) acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);
 470         return_ACPI_STATUS (status);
 471 }
 472
 473
 474 /*******************************************************************************
 475  *
 476  * FUNCTION:    acpi_install_gpe_handler
 477  *
 478  * PARAMETERS:  gpe_number      - The GPE number within the GPE block
 479  *              gpe_block       - GPE block (NULL == FADT GPEs)
 480  *              Type            - Whether this GPE should be treated as an
 481  *                                edge- or level-triggered interrupt.
 482  *              Handler         - Address of the handler
 483  *              Context         - Value passed to the handler on each GPE
 484  *
 485  * RETURN:      Status
 486  *
 487  * DESCRIPTION: Install a handler for a General Purpose Event.
 488  *
 489  ******************************************************************************/
 490
 491 acpi_status
 492 acpi_install_gpe_handler (
 493         acpi_handle                     gpe_device,
 494         u32                             gpe_number,
 495         u32                             type,
 496         acpi_gpe_handler                handler,
 497         void                            *context)
 498 {
 499         acpi_status                     status;
 500         struct acpi_gpe_event_info      *gpe_event_info;
 501
 502
 503         ACPI_FUNCTION_TRACE ("acpi_install_gpe_handler");
 504
 505
 506         /* Parameter validation */
 507
 508         if (!handler) {
 509                 return_ACPI_STATUS (AE_BAD_PARAMETER);
 510         }
 511
 512         status = acpi_ut_acquire_mutex (ACPI_MTX_EVENTS);
 513         if (ACPI_FAILURE (status)) {
 514                 return_ACPI_STATUS (status);
 515         }
 516
 517         /* Ensure that we have a valid GPE number */
 518
 519         gpe_event_info = acpi_ev_get_gpe_event_info (gpe_device, gpe_number);
 520         if (!gpe_event_info) {
 521                 status = AE_BAD_PARAMETER;
 522                 goto unlock_and_exit;
 523         }
 524
 525         /* Make sure that there isn't a handler there already */
 526
 527         if (gpe_event_info->handler) {
 528                 status = AE_ALREADY_EXISTS;
 529                 goto unlock_and_exit;
 530         }
 531
 532         /* Install the handler */
 533
 534         acpi_os_acquire_lock (acpi_gbl_gpe_lock, ACPI_NOT_ISR);
 535         gpe_event_info->handler = handler;
 536         gpe_event_info->context = context;
 537         gpe_event_info->flags = (u8) type;
 538         acpi_os_release_lock (acpi_gbl_gpe_lock, ACPI_NOT_ISR);
 539
 540         /* Clear the GPE (of stale events), the enable it */
 541
 542         status = acpi_hw_clear_gpe (gpe_event_info);
 543         if (ACPI_FAILURE (status)) {
 544                 goto unlock_and_exit;
 545         }
 546
 547         status = acpi_hw_enable_gpe (gpe_event_info);
 548
 549
 550 unlock_and_exit:
 551         (void) acpi_ut_release_mutex (ACPI_MTX_EVENTS);
 552         return_ACPI_STATUS (status);
 553 }
 554
 555
 556 /*******************************************************************************
 557  *
 558  * FUNCTION:    acpi_remove_gpe_handler
 559  *
 560  * PARAMETERS:  gpe_number      - The event to remove a handler
 561  *              gpe_block       - GPE block (NULL == FADT GPEs)
 562  *              Handler         - Address of the handler
 563  *
 564  * RETURN:      Status
 565  *
 566  * DESCRIPTION: Remove a handler for a General Purpose acpi_event.
 567  *
 568  ******************************************************************************/
 569
 570 acpi_status
 571 acpi_remove_gpe_handler (
 572         acpi_handle                     gpe_device,
 573         u32                             gpe_number,
 574         acpi_gpe_handler                handler)
 575 {
 576         acpi_status                     status;
 577         struct acpi_gpe_event_info      *gpe_event_info;
 578
 579
 580         ACPI_FUNCTION_TRACE ("acpi_remove_gpe_handler");
 581
 582
 583         /* Parameter validation */
 584
 585         if (!handler) {
 586                 return_ACPI_STATUS (AE_BAD_PARAMETER);
 587         }
 588
 589         status = acpi_ut_acquire_mutex (ACPI_MTX_EVENTS);
 590         if (ACPI_FAILURE (status)) {
 591                 return_ACPI_STATUS (status);
 592         }
 593
 594         /* Ensure that we have a valid GPE number */
 595
 596         gpe_event_info = acpi_ev_get_gpe_event_info (gpe_device, gpe_number);
 597         if (!gpe_event_info) {
 598                 status = AE_BAD_PARAMETER;
 599                 goto unlock_and_exit;
 600         }
 601
 602         /* Disable the GPE before removing the handler */
 603
 604         status = acpi_hw_disable_gpe (gpe_event_info);
 605         if (ACPI_FAILURE (status)) {
 606                 goto unlock_and_exit;
 607         }
 608
 609         /* Make sure that the installed handler is the same */
 610
 611         if (gpe_event_info->handler != handler) {
 612                 (void) acpi_hw_enable_gpe (gpe_event_info);
 613                 status = AE_BAD_PARAMETER;
 614                 goto unlock_and_exit;
 615         }
 616
 617         /* Remove the handler */
 618
 619         acpi_os_acquire_lock (acpi_gbl_gpe_lock, ACPI_NOT_ISR);
 620         gpe_event_info->handler = NULL;
 621         gpe_event_info->context = NULL;
 622         acpi_os_release_lock (acpi_gbl_gpe_lock, ACPI_NOT_ISR);
 623
 624
 625 unlock_and_exit:
 626         (void) acpi_ut_release_mutex (ACPI_MTX_EVENTS);
 627         return_ACPI_STATUS (status);
 628 }
 629
 630
 631 /*******************************************************************************
 632  *
 633  * FUNCTION:    acpi_acquire_global_lock
 634  *
 635  * PARAMETERS:  Timeout         - How long the caller is willing to wait
 636  *              out_handle      - A handle to the lock if acquired
 637  *
 638  * RETURN:      Status
 639  *
 640  * DESCRIPTION: Acquire the ACPI Global Lock
 641  *
 642  ******************************************************************************/
 643
 644 acpi_status
 645 acpi_acquire_global_lock (
 646         u16                             timeout,
 647         u32                             *handle)
 648 {
 649         acpi_status                     status;
 650
 651
 652         if (!handle) {
 653                 return (AE_BAD_PARAMETER);
 654         }
 655
 656         status = acpi_ex_enter_interpreter ();
 657         if (ACPI_FAILURE (status)) {
 658                 return (status);
 659         }
 660
 661         status = acpi_ev_acquire_global_lock (timeout);
 662         acpi_ex_exit_interpreter ();
 663
 664         if (ACPI_SUCCESS (status)) {
 665                 acpi_gbl_global_lock_handle++;
 666                 *handle = acpi_gbl_global_lock_handle;
 667         }
 668
 669         return (status);
 670 }
 671
 672
 673 /*******************************************************************************
 674  *
 675  * FUNCTION:    acpi_release_global_lock
 676  *
 677  * PARAMETERS:  Handle      - Returned from acpi_acquire_global_lock
 678  *
 679  * RETURN:      Status
 680  *
 681  * DESCRIPTION: Release the ACPI Global Lock
 682  *
 683  ******************************************************************************/
 684
 685 acpi_status
 686 acpi_release_global_lock (
 687         u32                             handle)
 688 {
 689         acpi_status                     status;
 690
 691
 692         if (handle != acpi_gbl_global_lock_handle) {
 693                 return (AE_NOT_ACQUIRED);
 694         }
 695
 696         status = acpi_ev_release_global_lock ();
 697         return (status);
 698 }
 699
 700