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