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                 /* Make sure all deferred tasks are completed */
 410
 411                 (void) acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);
 412                 acpi_os_wait_events_complete(NULL);
 413                 status = acpi_ut_acquire_mutex (ACPI_MTX_NAMESPACE);
 414                 if (ACPI_FAILURE (status)) {
 415                         return_ACPI_STATUS (status);
 416                 }
 417
 418                 if (handler_type == ACPI_SYSTEM_NOTIFY) {
 419                         acpi_gbl_system_notify.node  = NULL;
 420                         acpi_gbl_system_notify.handler = NULL;
 421                         acpi_gbl_system_notify.context = NULL;
 422                 }
 423                 else {
 424                         acpi_gbl_device_notify.node  = NULL;
 425                         acpi_gbl_device_notify.handler = NULL;
 426                         acpi_gbl_device_notify.context = NULL;
 427                 }
 428         }
 429
 430         /*
 431          * All Other Objects
 432          */
 433         else {
 434                 /* Notifies allowed on this object? */
 435
 436                 if (!acpi_ev_is_notify_object (node)) {
 437                         status = AE_TYPE;
 438                         goto unlock_and_exit;
 439                 }
 440
 441                 /* Check for an existing internal object */
 442
 443                 obj_desc = acpi_ns_get_attached_object (node);
 444                 if (!obj_desc) {
 445                         status = AE_NOT_EXIST;
 446                         goto unlock_and_exit;
 447                 }
 448
 449                 /* Object exists - make sure there's an existing handler */
 450
 451                 if (handler_type == ACPI_SYSTEM_NOTIFY) {
 452                         notify_obj = obj_desc->common_notify.system_notify;
 453                 }
 454                 else {
 455                         notify_obj = obj_desc->common_notify.device_notify;
 456                 }
 457
 458                 if ((!notify_obj) ||
 459                         (notify_obj->notify.handler != handler)) {
 460                         status = AE_BAD_PARAMETER;
 461                         goto unlock_and_exit;
 462                 }
 463
 464                 /* Make sure all deferred tasks are completed */
 465
 466                 (void) acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);
 467                 acpi_os_wait_events_complete(NULL);
 468                 status = acpi_ut_acquire_mutex (ACPI_MTX_NAMESPACE);
 469                 if (ACPI_FAILURE (status)) {
 470                         return_ACPI_STATUS (status);
 471                 }
 472
 473                 /* Remove the handler */
 474
 475                 if (handler_type == ACPI_SYSTEM_NOTIFY) {
 476                         obj_desc->common_notify.system_notify = NULL;
 477                 }
 478                 else {
 479                         obj_desc->common_notify.device_notify = NULL;
 480                 }
 481
 482                 acpi_ut_remove_reference (notify_obj);
 483         }
 484
 485
 486 unlock_and_exit:
 487         (void) acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);
 488         return_ACPI_STATUS (status);
 489 }
 490
 491
 492 /*******************************************************************************
 493  *
 494  * FUNCTION:    acpi_install_gpe_handler
 495  *
 496  * PARAMETERS:  gpe_number      - The GPE number within the GPE block
 497  *              gpe_block       - GPE block (NULL == FADT GPEs)
 498  *              Type            - Whether this GPE should be treated as an
 499  *                                edge- or level-triggered interrupt.
 500  *              Handler         - Address of the handler
 501  *              Context         - Value passed to the handler on each GPE
 502  *
 503  * RETURN:      Status
 504  *
 505  * DESCRIPTION: Install a handler for a General Purpose Event.
 506  *
 507  ******************************************************************************/
 508
 509 acpi_status
 510 acpi_install_gpe_handler (
 511         acpi_handle                     gpe_device,
 512         u32                             gpe_number,
 513         u32                             type,
 514         acpi_gpe_handler                handler,
 515         void                            *context)
 516 {
 517         acpi_status                     status;
 518         struct acpi_gpe_event_info      *gpe_event_info;
 519
 520
 521         ACPI_FUNCTION_TRACE ("acpi_install_gpe_handler");
 522
 523
 524         /* Parameter validation */
 525
 526         if (!handler) {
 527                 return_ACPI_STATUS (AE_BAD_PARAMETER);
 528         }
 529
 530         status = acpi_ut_acquire_mutex (ACPI_MTX_EVENTS);
 531         if (ACPI_FAILURE (status)) {
 532                 return_ACPI_STATUS (status);
 533         }
 534
 535         /* Ensure that we have a valid GPE number */
 536
 537         gpe_event_info = acpi_ev_get_gpe_event_info (gpe_device, gpe_number);
 538         if (!gpe_event_info) {
 539                 status = AE_BAD_PARAMETER;
 540                 goto unlock_and_exit;
 541         }
 542
 543         /* Make sure that there isn't a handler there already */
 544
 545         if (gpe_event_info->handler) {
 546                 status = AE_ALREADY_EXISTS;
 547                 goto unlock_and_exit;
 548         }
 549
 550         /* Install the handler */
 551
 552         acpi_os_acquire_lock (acpi_gbl_gpe_lock, ACPI_NOT_ISR);
 553         gpe_event_info->handler = handler;
 554         gpe_event_info->context = context;
 555         gpe_event_info->flags = (u8) type;
 556         acpi_os_release_lock (acpi_gbl_gpe_lock, ACPI_NOT_ISR);
 557
 558         /* Clear the GPE (of stale events), the enable it */
 559
 560         status = acpi_hw_clear_gpe (gpe_event_info);
 561         if (ACPI_FAILURE (status)) {
 562                 goto unlock_and_exit;
 563         }
 564
 565         status = acpi_hw_enable_gpe (gpe_event_info);
 566
 567
 568 unlock_and_exit:
 569         (void) acpi_ut_release_mutex (ACPI_MTX_EVENTS);
 570         return_ACPI_STATUS (status);
 571 }
 572
 573
 574 /*******************************************************************************
 575  *
 576  * FUNCTION:    acpi_remove_gpe_handler
 577  *
 578  * PARAMETERS:  gpe_number      - The event to remove a handler
 579  *              gpe_block       - GPE block (NULL == FADT GPEs)
 580  *              Handler         - Address of the handler
 581  *
 582  * RETURN:      Status
 583  *
 584  * DESCRIPTION: Remove a handler for a General Purpose acpi_event.
 585  *
 586  ******************************************************************************/
 587
 588 acpi_status
 589 acpi_remove_gpe_handler (
 590         acpi_handle                     gpe_device,
 591         u32                             gpe_number,
 592         acpi_gpe_handler                handler)
 593 {
 594         acpi_status                     status;
 595         struct acpi_gpe_event_info      *gpe_event_info;
 596
 597
 598         ACPI_FUNCTION_TRACE ("acpi_remove_gpe_handler");
 599
 600
 601         /* Parameter validation */
 602
 603         if (!handler) {
 604                 return_ACPI_STATUS (AE_BAD_PARAMETER);
 605         }
 606
 607         status = acpi_ut_acquire_mutex (ACPI_MTX_EVENTS);
 608         if (ACPI_FAILURE (status)) {
 609                 return_ACPI_STATUS (status);
 610         }
 611
 612         /* Ensure that we have a valid GPE number */
 613
 614         gpe_event_info = acpi_ev_get_gpe_event_info (gpe_device, gpe_number);
 615         if (!gpe_event_info) {
 616                 status = AE_BAD_PARAMETER;
 617                 goto unlock_and_exit;
 618         }
 619
 620         /* Disable the GPE before removing the handler */
 621
 622         status = acpi_hw_disable_gpe (gpe_event_info);
 623         if (ACPI_FAILURE (status)) {
 624                 goto unlock_and_exit;
 625         }
 626
 627         /* Make sure that the installed handler is the same */
 628
 629         if (gpe_event_info->handler != handler) {
 630                 (void) acpi_hw_enable_gpe (gpe_event_info);
 631                 status = AE_BAD_PARAMETER;
 632                 goto unlock_and_exit;
 633         }
 634
 635         /* Make sure all deferred tasks are completed */
 636
 637         (void) acpi_ut_release_mutex (ACPI_MTX_EVENTS);
 638         acpi_os_wait_events_complete(NULL);
 639         status = acpi_ut_acquire_mutex (ACPI_MTX_EVENTS);
 640         if (ACPI_FAILURE (status)) {
 641                 return_ACPI_STATUS (status);
 642         }
 643
 644         /* Remove the handler */
 645
 646         acpi_os_acquire_lock (acpi_gbl_gpe_lock, ACPI_NOT_ISR);
 647         gpe_event_info->handler = NULL;
 648         gpe_event_info->context = NULL;
 649         acpi_os_release_lock (acpi_gbl_gpe_lock, ACPI_NOT_ISR);
 650
 651
 652 unlock_and_exit:
 653         (void) acpi_ut_release_mutex (ACPI_MTX_EVENTS);
 654         return_ACPI_STATUS (status);
 655 }
 656
 657
 658 /*******************************************************************************
 659  *
 660  * FUNCTION:    acpi_acquire_global_lock
 661  *
 662  * PARAMETERS:  Timeout         - How long the caller is willing to wait
 663  *              out_handle      - A handle to the lock if acquired
 664  *
 665  * RETURN:      Status
 666  *
 667  * DESCRIPTION: Acquire the ACPI Global Lock
 668  *
 669  ******************************************************************************/
 670
 671 acpi_status
 672 acpi_acquire_global_lock (
 673         u16                             timeout,
 674         u32                             *handle)
 675 {
 676         acpi_status                     status;
 677
 678
 679         if (!handle) {
 680                 return (AE_BAD_PARAMETER);
 681         }
 682
 683         status = acpi_ex_enter_interpreter ();
 684         if (ACPI_FAILURE (status)) {
 685                 return (status);
 686         }
 687
 688         status = acpi_ev_acquire_global_lock (timeout);
 689         acpi_ex_exit_interpreter ();
 690
 691         if (ACPI_SUCCESS (status)) {
 692                 acpi_gbl_global_lock_handle++;
 693                 *handle = acpi_gbl_global_lock_handle;
 694         }
 695
 696         return (status);
 697 }
 698
 699
 700 /*******************************************************************************
 701  *
 702  * FUNCTION:    acpi_release_global_lock
 703  *
 704  * PARAMETERS:  Handle      - Returned from acpi_acquire_global_lock
 705  *
 706  * RETURN:      Status
 707  *
 708  * DESCRIPTION: Release the ACPI Global Lock
 709  *
 710  ******************************************************************************/
 711
 712 acpi_status
 713 acpi_release_global_lock (
 714         u32                             handle)
 715 {
 716         acpi_status                     status;
 717
 718
 719         if (handle != acpi_gbl_global_lock_handle) {
 720                 return (AE_NOT_ACQUIRED);
 721         }
 722
 723         status = acpi_ev_release_global_lock ();
 724         return (status);
 725 }
 726
 727