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