drivers/acpi/events/evxface.c

   1 /******************************************************************************
   2  *
   3  * Module Name: evxface - External interfaces for ACPI events
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2005, R. Byron Moore
   9  * All rights reserved.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions, and the following disclaimer,
  16  *    without modification.
  17  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  18  *    substantially similar to the "NO WARRANTY" disclaimer below
  19  *    ("Disclaimer") and any redistribution must be conditioned upon
  20  *    including a substantially similar Disclaimer requirement for further
  21  *    binary redistribution.
  22  * 3. Neither the names of the above-listed copyright holders nor the names
  23  *    of any contributors may be used to endorse or promote products derived
  24  *    from this software without specific prior written permission.
  25  *
  26  * Alternatively, this software may be distributed under the terms of the
  27  * GNU General Public License ("GPL") version 2 as published by the Free
  28  * Software Foundation.
  29  *
  30  * NO WARRANTY
  31  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  32  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  33  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  34  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  35  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  36  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  37  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  38  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  39  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  40  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  41  * POSSIBILITY OF SUCH DAMAGES.
  42  */
  43
  44 #include <linux/module.h>
  45
  46 #include <acpi/acpi.h>
  47 #include <acpi/acnamesp.h>
  48 #include <acpi/acevents.h>
  49 #include <acpi/acinterp.h>
  50
  51 #define _COMPONENT          ACPI_EVENTS
  52          ACPI_MODULE_NAME    ("evxface")
  53
  54
  55 /*******************************************************************************
  56  *
  57  * FUNCTION:    acpi_install_exception_handler
  58  *
  59  * PARAMETERS:  Handler         - Pointer to the handler function for the
  60  *                                event
  61  *
  62  * RETURN:      Status
  63  *
  64  * DESCRIPTION: Saves the pointer to the handler function
  65  *
  66  ******************************************************************************/
  67
  68 #ifdef ACPI_FUTURE_USAGE
  69 acpi_status
  70 acpi_install_exception_handler (
  71         acpi_exception_handler          handler)
  72 {
  73         acpi_status                     status;
  74
  75
  76         ACPI_FUNCTION_TRACE ("acpi_install_exception_handler");
  77
  78
  79         status = acpi_ut_acquire_mutex (ACPI_MTX_EVENTS);
  80         if (ACPI_FAILURE (status)) {
  81                 return_ACPI_STATUS (status);
  82         }
  83
  84         /* Don't allow two handlers. */
  85
  86         if (acpi_gbl_exception_handler) {
  87                 status = AE_ALREADY_EXISTS;
  88                 goto cleanup;
  89         }
  90
  91         /* Install the handler */
  92
  93         acpi_gbl_exception_handler = handler;
  94
  95 cleanup:
  96         (void) acpi_ut_release_mutex (ACPI_MTX_EVENTS);
  97         return_ACPI_STATUS (status);
  98 }
  99 #endif  /*  ACPI_FUTURE_USAGE  */
 100
 101
 102 /*******************************************************************************
 103  *
 104  * FUNCTION:    acpi_install_fixed_event_handler
 105  *
 106  * PARAMETERS:  Event           - Event type to enable.
 107  *              Handler         - Pointer to the handler function for the
 108  *                                event
 109  *              Context         - Value passed to the handler on each GPE
 110  *
 111  * RETURN:      Status
 112  *
 113  * DESCRIPTION: Saves the pointer to the handler function and then enables the
 114  *              event.
 115  *
 116  ******************************************************************************/
 117
 118 acpi_status
 119 acpi_install_fixed_event_handler (
 120         u32                             event,
 121         acpi_event_handler              handler,
 122         void                            *context)
 123 {
 124         acpi_status                     status;
 125
 126
 127         ACPI_FUNCTION_TRACE ("acpi_install_fixed_event_handler");
 128
 129
 130         /* Parameter validation */
 131
 132         if (event > ACPI_EVENT_MAX) {
 133                 return_ACPI_STATUS (AE_BAD_PARAMETER);
 134         }
 135
 136         status = acpi_ut_acquire_mutex (ACPI_MTX_EVENTS);
 137         if (ACPI_FAILURE (status)) {
 138                 return_ACPI_STATUS (status);
 139         }
 140
 141         /* Don't allow two handlers. */
 142
 143         if (NULL != acpi_gbl_fixed_event_handlers[event].handler) {
 144                 status = AE_ALREADY_EXISTS;
 145                 goto cleanup;
 146         }
 147
 148         /* Install the handler before enabling the event */
 149
 150         acpi_gbl_fixed_event_handlers[event].handler = handler;
 151         acpi_gbl_fixed_event_handlers[event].context = context;
 152
 153         status = acpi_clear_event (event);
 154         if (ACPI_SUCCESS(status))
 155                 status = acpi_enable_event (event, 0);
 156         if (ACPI_FAILURE (status)) {
 157                 ACPI_DEBUG_PRINT ((ACPI_DB_WARN, "Could not enable fixed event.\n"));
 158
 159                 /* Remove the handler */
 160
 161                 acpi_gbl_fixed_event_handlers[event].handler = NULL;
 162                 acpi_gbl_fixed_event_handlers[event].context = NULL;
 163         }
 164         else {
 165                 ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
 166                         "Enabled fixed event %X, Handler=%p\n", event, handler));
 167         }
 168
 169
 170 cleanup:
 171         (void) acpi_ut_release_mutex (ACPI_MTX_EVENTS);
 172         return_ACPI_STATUS (status);
 173 }
 174 EXPORT_SYMBOL(acpi_install_fixed_event_handler);
 175
 176
 177 /*******************************************************************************
 178  *
 179  * FUNCTION:    acpi_remove_fixed_event_handler
 180  *
 181  * PARAMETERS:  Event           - Event type to disable.
 182  *              Handler         - Address of the handler
 183  *
 184  * RETURN:      Status
 185  *
 186  * DESCRIPTION: Disables the event and unregisters the event handler.
 187  *
 188  ******************************************************************************/
 189
 190 acpi_status
 191 acpi_remove_fixed_event_handler (
 192         u32                             event,
 193         acpi_event_handler              handler)
 194 {
 195         acpi_status                     status = AE_OK;
 196
 197
 198         ACPI_FUNCTION_TRACE ("acpi_remove_fixed_event_handler");
 199
 200
 201         /* Parameter validation */
 202
 203         if (event > ACPI_EVENT_MAX) {
 204                 return_ACPI_STATUS (AE_BAD_PARAMETER);
 205         }
 206
 207         status = acpi_ut_acquire_mutex (ACPI_MTX_EVENTS);
 208         if (ACPI_FAILURE (status)) {
 209                 return_ACPI_STATUS (status);
 210         }
 211
 212         /* Disable the event before removing the handler */
 213
 214         status = acpi_disable_event (event, 0);
 215
 216         /* Always Remove the handler */
 217
 218         acpi_gbl_fixed_event_handlers[event].handler = NULL;
 219         acpi_gbl_fixed_event_handlers[event].context = NULL;
 220
 221         if (ACPI_FAILURE (status)) {
 222                 ACPI_DEBUG_PRINT ((ACPI_DB_WARN,
 223                         "Could not write to fixed event enable register.\n"));
 224         }
 225         else {
 226                 ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Disabled fixed event %X.\n", event));
 227         }
 228
 229         (void) acpi_ut_release_mutex (ACPI_MTX_EVENTS);
 230         return_ACPI_STATUS (status);
 231 }
 232 EXPORT_SYMBOL(acpi_remove_fixed_event_handler);
 233
 234
 235 /*******************************************************************************
 236  *
 237  * FUNCTION:    acpi_install_notify_handler
 238  *
 239  * PARAMETERS:  Device          - The device for which notifies will be handled
 240  *              handler_type    - The type of handler:
 241  *                                  ACPI_SYSTEM_NOTIFY: system_handler (00-7f)
 242  *                                  ACPI_DEVICE_NOTIFY: driver_handler (80-ff)
 243  *                                  ACPI_ALL_NOTIFY:  both system and device
 244  *              Handler         - Address of the handler
 245  *              Context         - Value passed to the handler on each GPE
 246  *
 247  * RETURN:      Status
 248  *
 249  * DESCRIPTION: Install a handler for notifies on an ACPI device
 250  *
 251  ******************************************************************************/
 252
 253 acpi_status
 254 acpi_install_notify_handler (
 255         acpi_handle                     device,
 256         u32                             handler_type,
 257         acpi_notify_handler             handler,
 258         void                            *context)
 259 {
 260         union acpi_operand_object       *obj_desc;
 261         union acpi_operand_object       *notify_obj;
 262         struct acpi_namespace_node      *node;
 263         acpi_status                     status;
 264
 265
 266         ACPI_FUNCTION_TRACE ("acpi_install_notify_handler");
 267
 268
 269         /* Parameter validation */
 270
 271         if ((!device)  ||
 272                 (!handler) ||
 273                 (handler_type > ACPI_MAX_NOTIFY_HANDLER_TYPE)) {
 274                 return_ACPI_STATUS (AE_BAD_PARAMETER);
 275         }
 276
 277         status = acpi_ut_acquire_mutex (ACPI_MTX_NAMESPACE);
 278         if (ACPI_FAILURE (status)) {
 279                 return_ACPI_STATUS (status);
 280         }
 281
 282         /* Convert and validate the device handle */
 283
 284         node = acpi_ns_map_handle_to_node (device);
 285         if (!node) {
 286                 status = AE_BAD_PARAMETER;
 287                 goto unlock_and_exit;
 288         }
 289
 290         /*
 291          * Root Object:
 292          * Registering a notify handler on the root object indicates that the
 293          * caller wishes to receive notifications for all objects.  Note that
 294          * only one <external> global handler can be regsitered (per notify type).
 295          */
 296         if (device == ACPI_ROOT_OBJECT) {
 297                 /* Make sure the handler is not already installed */
 298
 299                 if (((handler_type & ACPI_SYSTEM_NOTIFY) &&
 300                                 acpi_gbl_system_notify.handler)     ||
 301                         ((handler_type & ACPI_DEVICE_NOTIFY) &&
 302                                 acpi_gbl_device_notify.handler)) {
 303                         status = AE_ALREADY_EXISTS;
 304                         goto unlock_and_exit;
 305                 }
 306
 307                 if (handler_type & ACPI_SYSTEM_NOTIFY) {
 308                         acpi_gbl_system_notify.node  = node;
 309                         acpi_gbl_system_notify.handler = handler;
 310                         acpi_gbl_system_notify.context = context;
 311                 }
 312
 313                 if (handler_type & ACPI_DEVICE_NOTIFY) {
 314                         acpi_gbl_device_notify.node  = node;
 315                         acpi_gbl_device_notify.handler = handler;
 316                         acpi_gbl_device_notify.context = context;
 317                 }
 318
 319                 /* Global notify handler installed */
 320         }
 321
 322         /*
 323          * All Other Objects:
 324          * Caller will only receive notifications specific to the target object.
 325          * Note that only certain object types can receive notifications.
 326          */
 327         else {
 328                 /* Notifies allowed on this object? */
 329
 330                 if (!acpi_ev_is_notify_object (node)) {
 331                         status = AE_TYPE;
 332                         goto unlock_and_exit;
 333                 }
 334
 335                 /* Check for an existing internal object */
 336
 337                 obj_desc = acpi_ns_get_attached_object (node);
 338                 if (obj_desc) {
 339                         /* Object exists - make sure there's no handler */
 340
 341                         if (((handler_type & ACPI_SYSTEM_NOTIFY) &&
 342                                         obj_desc->common_notify.system_notify) ||
 343                                 ((handler_type & ACPI_DEVICE_NOTIFY) &&
 344                                         obj_desc->common_notify.device_notify)) {
 345                                 status = AE_ALREADY_EXISTS;
 346                                 goto unlock_and_exit;
 347                         }
 348                 }
 349                 else {
 350                         /* Create a new object */
 351
 352                         obj_desc = acpi_ut_create_internal_object (node->type);
 353                         if (!obj_desc) {
 354                                 status = AE_NO_MEMORY;
 355                                 goto unlock_and_exit;
 356                         }
 357
 358                         /* Attach new object to the Node */
 359
 360                         status = acpi_ns_attach_object (device, obj_desc, node->type);
 361
 362                         /* Remove local reference to the object */
 363
 364                         acpi_ut_remove_reference (obj_desc);
 365                         if (ACPI_FAILURE (status)) {
 366                                 goto unlock_and_exit;
 367                         }
 368                 }
 369
 370                 /* Install the handler */
 371
 372                 notify_obj = acpi_ut_create_internal_object (ACPI_TYPE_LOCAL_NOTIFY);
 373                 if (!notify_obj) {
 374                         status = AE_NO_MEMORY;
 375                         goto unlock_and_exit;
 376                 }
 377
 378                 notify_obj->notify.node   = node;
 379                 notify_obj->notify.handler = handler;
 380                 notify_obj->notify.context = context;
 381
 382                 if (handler_type & ACPI_SYSTEM_NOTIFY) {
 383                         obj_desc->common_notify.system_notify = notify_obj;
 384                 }
 385
 386                 if (handler_type & ACPI_DEVICE_NOTIFY) {
 387                         obj_desc->common_notify.device_notify = notify_obj;
 388                 }
 389
 390                 if (handler_type == ACPI_ALL_NOTIFY) {
 391                         /* Extra ref if installed in both */
 392
 393                         acpi_ut_add_reference (notify_obj);
 394                 }
 395         }
 396
 397
 398 unlock_and_exit:
 399         (void) acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);
 400         return_ACPI_STATUS (status);
 401 }
 402 EXPORT_SYMBOL(acpi_install_notify_handler);
 403
 404
 405 /*******************************************************************************
 406  *
 407  * FUNCTION:    acpi_remove_notify_handler
 408  *
 409  * PARAMETERS:  Device          - The device for which notifies will be handled
 410  *              handler_type    - The type of handler:
 411  *                                  ACPI_SYSTEM_NOTIFY: system_handler (00-7f)
 412  *                                  ACPI_DEVICE_NOTIFY: driver_handler (80-ff)
 413  *                                  ACPI_ALL_NOTIFY:  both system and device
 414  *              Handler         - Address of the handler
 415  *
 416  * RETURN:      Status
 417  *
 418  * DESCRIPTION: Remove a handler for notifies on an ACPI device
 419  *
 420  ******************************************************************************/
 421
 422 acpi_status
 423 acpi_remove_notify_handler (
 424         acpi_handle                     device,
 425         u32                             handler_type,
 426         acpi_notify_handler             handler)
 427 {
 428         union acpi_operand_object       *notify_obj;
 429         union acpi_operand_object       *obj_desc;
 430         struct acpi_namespace_node      *node;
 431         acpi_status                     status;
 432
 433
 434         ACPI_FUNCTION_TRACE ("acpi_remove_notify_handler");
 435
 436
 437         /* Parameter validation */
 438
 439         if ((!device)  ||
 440                 (!handler) ||
 441                 (handler_type > ACPI_MAX_NOTIFY_HANDLER_TYPE)) {
 442                 return_ACPI_STATUS (AE_BAD_PARAMETER);
 443         }
 444
 445         status = acpi_ut_acquire_mutex (ACPI_MTX_NAMESPACE);
 446         if (ACPI_FAILURE (status)) {
 447                 return_ACPI_STATUS (status);
 448         }
 449
 450         /* Convert and validate the device handle */
 451
 452         node = acpi_ns_map_handle_to_node (device);
 453         if (!node) {
 454                 status = AE_BAD_PARAMETER;
 455                 goto unlock_and_exit;
 456         }
 457
 458         /* Root Object */
 459
 460         if (device == ACPI_ROOT_OBJECT) {
 461                 ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
 462                         "Removing notify handler for ROOT object.\n"));
 463
 464                 if (((handler_type & ACPI_SYSTEM_NOTIFY) &&
 465                           !acpi_gbl_system_notify.handler)      ||
 466                         ((handler_type & ACPI_DEVICE_NOTIFY) &&
 467                           !acpi_gbl_device_notify.handler)) {
 468                         status = AE_NOT_EXIST;
 469                         goto unlock_and_exit;
 470                 }
 471
 472                 /* Make sure all deferred tasks are completed */
 473
 474                 (void) acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);
 475                 acpi_os_wait_events_complete(NULL);
 476                 status = acpi_ut_acquire_mutex (ACPI_MTX_NAMESPACE);
 477                 if (ACPI_FAILURE (status)) {
 478                         return_ACPI_STATUS (status);
 479                 }
 480
 481                 if (handler_type & ACPI_SYSTEM_NOTIFY) {
 482                         acpi_gbl_system_notify.node  = NULL;
 483                         acpi_gbl_system_notify.handler = NULL;
 484                         acpi_gbl_system_notify.context = NULL;
 485                 }
 486
 487                 if (handler_type & ACPI_DEVICE_NOTIFY) {
 488                         acpi_gbl_device_notify.node  = NULL;
 489                         acpi_gbl_device_notify.handler = NULL;
 490                         acpi_gbl_device_notify.context = NULL;
 491                 }
 492         }
 493
 494         /* All Other Objects */
 495
 496         else {
 497                 /* Notifies allowed on this object? */
 498
 499                 if (!acpi_ev_is_notify_object (node)) {
 500                         status = AE_TYPE;
 501                         goto unlock_and_exit;
 502                 }
 503
 504                 /* Check for an existing internal object */
 505
 506                 obj_desc = acpi_ns_get_attached_object (node);
 507                 if (!obj_desc) {
 508                         status = AE_NOT_EXIST;
 509                         goto unlock_and_exit;
 510                 }
 511
 512                 /* Object exists - make sure there's an existing handler */
 513
 514                 if (handler_type & ACPI_SYSTEM_NOTIFY) {
 515                         notify_obj = obj_desc->common_notify.system_notify;
 516                         if ((!notify_obj) ||
 517                                  (notify_obj->notify.handler != handler)) {
 518                                 status = AE_BAD_PARAMETER;
 519                                 goto unlock_and_exit;
 520                         }
 521                         /* Make sure all deferred tasks are completed */
 522
 523                         (void) acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);
 524                         acpi_os_wait_events_complete(NULL);
 525                         status = acpi_ut_acquire_mutex (ACPI_MTX_NAMESPACE);
 526                         if (ACPI_FAILURE (status)) {
 527                                 return_ACPI_STATUS (status);
 528                         }
 529
 530                         /* Remove the handler */
 531                         obj_desc->common_notify.system_notify = NULL;
 532                         acpi_ut_remove_reference (notify_obj);
 533                 }
 534
 535                 if (handler_type & ACPI_DEVICE_NOTIFY) {
 536                         notify_obj = obj_desc->common_notify.device_notify;
 537                         if ((!notify_obj) ||
 538                                  (notify_obj->notify.handler != handler)) {
 539                                 status = AE_BAD_PARAMETER;
 540                                 goto unlock_and_exit;
 541                         }
 542                         /* Make sure all deferred tasks are completed */
 543
 544                         (void) acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);
 545                         acpi_os_wait_events_complete(NULL);
 546                         status = acpi_ut_acquire_mutex (ACPI_MTX_NAMESPACE);
 547                         if (ACPI_FAILURE (status)) {
 548                                 return_ACPI_STATUS (status);
 549                         }
 550
 551                         /* Remove the handler */
 552                         obj_desc->common_notify.device_notify = NULL;
 553                         acpi_ut_remove_reference (notify_obj);
 554                 }
 555         }
 556
 557
 558 unlock_and_exit:
 559         (void) acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);
 560         return_ACPI_STATUS (status);
 561 }
 562 EXPORT_SYMBOL(acpi_remove_notify_handler);
 563
 564
 565 /*******************************************************************************
 566  *
 567  * FUNCTION:    acpi_install_gpe_handler
 568  *
 569  * PARAMETERS:  gpe_device      - Namespace node for the GPE (NULL for FADT
 570  *                                defined GPEs)
 571  *              gpe_number      - The GPE number within the GPE block
 572  *              Type            - Whether this GPE should be treated as an
 573  *                                edge- or level-triggered interrupt.
 574  *              Address         - Address of the handler
 575  *              Context         - Value passed to the handler on each GPE
 576  *
 577  * RETURN:      Status
 578  *
 579  * DESCRIPTION: Install a handler for a General Purpose Event.
 580  *
 581  ******************************************************************************/
 582
 583 acpi_status
 584 acpi_install_gpe_handler (
 585         acpi_handle                     gpe_device,
 586         u32                             gpe_number,
 587         u32                             type,
 588         acpi_event_handler              address,
 589         void                            *context)
 590 {
 591         struct acpi_gpe_event_info      *gpe_event_info;
 592         struct acpi_handler_info        *handler;
 593         acpi_status                     status;
 594         u32                             flags;
 595
 596
 597         ACPI_FUNCTION_TRACE ("acpi_install_gpe_handler");
 598
 599
 600         /* Parameter validation */
 601
 602         if ((!address) || (type > ACPI_GPE_XRUPT_TYPE_MASK)) {
 603                 return_ACPI_STATUS (AE_BAD_PARAMETER);
 604         }
 605
 606         status = acpi_ut_acquire_mutex (ACPI_MTX_EVENTS);
 607         if (ACPI_FAILURE (status)) {
 608                 return_ACPI_STATUS (status);
 609         }
 610
 611         /* Ensure that we have a valid GPE number */
 612
 613         gpe_event_info = acpi_ev_get_gpe_event_info (gpe_device, gpe_number);
 614         if (!gpe_event_info) {
 615                 status = AE_BAD_PARAMETER;
 616                 goto unlock_and_exit;
 617         }
 618
 619         /* Make sure that there isn't a handler there already */
 620
 621         if ((gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) == ACPI_GPE_DISPATCH_HANDLER) {
 622                 status = AE_ALREADY_EXISTS;
 623                 goto unlock_and_exit;
 624         }
 625
 626         /* Allocate and init handler object */
 627
 628         handler = ACPI_MEM_CALLOCATE (sizeof (struct acpi_handler_info));
 629         if (!handler) {
 630                 status = AE_NO_MEMORY;
 631                 goto unlock_and_exit;
 632         }
 633
 634         handler->address    = address;
 635         handler->context    = context;
 636         handler->method_node = gpe_event_info->dispatch.method_node;
 637
 638         /* Disable the GPE before installing the handler */
 639
 640         status = acpi_ev_disable_gpe (gpe_event_info);
 641         if (ACPI_FAILURE (status)) {
 642                 goto unlock_and_exit;
 643         }
 644
 645         /* Install the handler */
 646
 647         flags = acpi_os_acquire_lock (acpi_gbl_gpe_lock);
 648         gpe_event_info->dispatch.handler = handler;
 649
 650         /* Setup up dispatch flags to indicate handler (vs. method) */
 651
 652         gpe_event_info->flags &= ~(ACPI_GPE_XRUPT_TYPE_MASK | ACPI_GPE_DISPATCH_MASK); /* Clear bits */
 653         gpe_event_info->flags |= (u8) (type | ACPI_GPE_DISPATCH_HANDLER);
 654
 655         acpi_os_release_lock (acpi_gbl_gpe_lock, flags);
 656
 657
 658 unlock_and_exit:
 659         (void) acpi_ut_release_mutex (ACPI_MTX_EVENTS);
 660         return_ACPI_STATUS (status);
 661 }
 662 EXPORT_SYMBOL(acpi_install_gpe_handler);
 663
 664
 665 /*******************************************************************************
 666  *
 667  * FUNCTION:    acpi_remove_gpe_handler
 668  *
 669  * PARAMETERS:  gpe_device      - Namespace node for the GPE (NULL for FADT
 670  *                                defined GPEs)
 671  *              gpe_number      - The event to remove a handler
 672  *              Address         - Address of the handler
 673  *
 674  * RETURN:      Status
 675  *
 676  * DESCRIPTION: Remove a handler for a General Purpose acpi_event.
 677  *
 678  ******************************************************************************/
 679
 680 acpi_status
 681 acpi_remove_gpe_handler (
 682         acpi_handle                     gpe_device,
 683         u32                             gpe_number,
 684         acpi_event_handler              address)
 685 {
 686         struct acpi_gpe_event_info      *gpe_event_info;
 687         struct acpi_handler_info        *handler;
 688         acpi_status                     status;
 689         u32                             flags;
 690
 691
 692         ACPI_FUNCTION_TRACE ("acpi_remove_gpe_handler");
 693
 694
 695         /* Parameter validation */
 696
 697         if (!address) {
 698                 return_ACPI_STATUS (AE_BAD_PARAMETER);
 699         }
 700
 701         status = acpi_ut_acquire_mutex (ACPI_MTX_EVENTS);
 702         if (ACPI_FAILURE (status)) {
 703                 return_ACPI_STATUS (status);
 704         }
 705
 706         /* Ensure that we have a valid GPE number */
 707
 708         gpe_event_info = acpi_ev_get_gpe_event_info (gpe_device, gpe_number);
 709         if (!gpe_event_info) {
 710                 status = AE_BAD_PARAMETER;
 711                 goto unlock_and_exit;
 712         }
 713
 714         /* Make sure that a handler is indeed installed */
 715
 716         if ((gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) != ACPI_GPE_DISPATCH_HANDLER) {
 717                 status = AE_NOT_EXIST;
 718                 goto unlock_and_exit;
 719         }
 720
 721         /* Make sure that the installed handler is the same */
 722
 723         if (gpe_event_info->dispatch.handler->address != address) {
 724                 status = AE_BAD_PARAMETER;
 725                 goto unlock_and_exit;
 726         }
 727
 728         /* Disable the GPE before removing the handler */
 729
 730         status = acpi_ev_disable_gpe (gpe_event_info);
 731         if (ACPI_FAILURE (status)) {
 732                 goto unlock_and_exit;
 733         }
 734
 735         /* Make sure all deferred tasks are completed */
 736
 737         (void) acpi_ut_release_mutex (ACPI_MTX_EVENTS);
 738         acpi_os_wait_events_complete(NULL);
 739         status = acpi_ut_acquire_mutex (ACPI_MTX_EVENTS);
 740         if (ACPI_FAILURE (status)) {
 741                 return_ACPI_STATUS (status);
 742         }
 743
 744         /* Remove the handler */
 745
 746         flags = acpi_os_acquire_lock (acpi_gbl_gpe_lock);
 747         handler = gpe_event_info->dispatch.handler;
 748
 749         /* Restore Method node (if any), set dispatch flags */
 750
 751         gpe_event_info->dispatch.method_node = handler->method_node;
 752         gpe_event_info->flags &= ~ACPI_GPE_DISPATCH_MASK; /* Clear bits */
 753         if (handler->method_node) {
 754                 gpe_event_info->flags |= ACPI_GPE_DISPATCH_METHOD;
 755         }
 756         acpi_os_release_lock (acpi_gbl_gpe_lock, flags);
 757
 758         /* Now we can free the handler object */
 759
 760         ACPI_MEM_FREE (handler);
 761
 762
 763 unlock_and_exit:
 764         (void) acpi_ut_release_mutex (ACPI_MTX_EVENTS);
 765         return_ACPI_STATUS (status);
 766 }
 767 EXPORT_SYMBOL(acpi_remove_gpe_handler);
 768
 769
 770 /*******************************************************************************
 771  *
 772  * FUNCTION:    acpi_acquire_global_lock
 773  *
 774  * PARAMETERS:  Timeout         - How long the caller is willing to wait
 775  *              Handle          - Where the handle to the lock is returned
 776  *                                (if acquired)
 777  *
 778  * RETURN:      Status
 779  *
 780  * DESCRIPTION: Acquire the ACPI Global Lock
 781  *
 782  ******************************************************************************/
 783
 784 acpi_status
 785 acpi_acquire_global_lock (
 786         u16                             timeout,
 787         u32                             *handle)
 788 {
 789         acpi_status                     status;
 790
 791
 792         if (!handle) {
 793                 return (AE_BAD_PARAMETER);
 794         }
 795
 796         status = acpi_ex_enter_interpreter ();
 797         if (ACPI_FAILURE (status)) {
 798                 return (status);
 799         }
 800
 801         status = acpi_ev_acquire_global_lock (timeout);
 802         acpi_ex_exit_interpreter ();
 803
 804         if (ACPI_SUCCESS (status)) {
 805                 acpi_gbl_global_lock_handle++;
 806                 *handle = acpi_gbl_global_lock_handle;
 807         }
 808
 809         return (status);
 810 }
 811 EXPORT_SYMBOL(acpi_acquire_global_lock);
 812
 813
 814 /*******************************************************************************
 815  *
 816  * FUNCTION:    acpi_release_global_lock
 817  *
 818  * PARAMETERS:  Handle      - Returned from acpi_acquire_global_lock
 819  *
 820  * RETURN:      Status
 821  *
 822  * DESCRIPTION: Release the ACPI Global Lock. The handle must be valid.
 823  *
 824  ******************************************************************************/
 825
 826 acpi_status
 827 acpi_release_global_lock (
 828         u32                             handle)
 829 {
 830         acpi_status                     status;
 831
 832
 833         if (handle != acpi_gbl_global_lock_handle) {
 834                 return (AE_NOT_ACQUIRED);
 835         }
 836
 837         status = acpi_ev_release_global_lock ();
 838         return (status);
 839 }
 840 EXPORT_SYMBOL(acpi_release_global_lock);
 841