evxface.c revision 126372
1/****************************************************************************** 2 * 3 * Module Name: evxface - External interfaces for ACPI events 4 * $Revision: 142 $ 5 * 6 *****************************************************************************/ 7 8/****************************************************************************** 9 * 10 * 1. Copyright Notice 11 * 12 * Some or all of this work - Copyright (c) 1999 - 2004, Intel Corp. 13 * All rights reserved. 14 * 15 * 2. License 16 * 17 * 2.1. This is your license from Intel Corp. under its intellectual property 18 * rights. You may have additional license terms from the party that provided 19 * you this software, covering your right to use that party's intellectual 20 * property rights. 21 * 22 * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a 23 * copy of the source code appearing in this file ("Covered Code") an 24 * irrevocable, perpetual, worldwide license under Intel's copyrights in the 25 * base code distributed originally by Intel ("Original Intel Code") to copy, 26 * make derivatives, distribute, use and display any portion of the Covered 27 * Code in any form, with the right to sublicense such rights; and 28 * 29 * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent 30 * license (with the right to sublicense), under only those claims of Intel 31 * patents that are infringed by the Original Intel Code, to make, use, sell, 32 * offer to sell, and import the Covered Code and derivative works thereof 33 * solely to the minimum extent necessary to exercise the above copyright 34 * license, and in no event shall the patent license extend to any additions 35 * to or modifications of the Original Intel Code. No other license or right 36 * is granted directly or by implication, estoppel or otherwise; 37 * 38 * The above copyright and patent license is granted only if the following 39 * conditions are met: 40 * 41 * 3. Conditions 42 * 43 * 3.1. Redistribution of Source with Rights to Further Distribute Source. 44 * Redistribution of source code of any substantial prton of the Covered 45 * Code or modification with rights to further distribute source must include 46 * the above Copyright Notice, the above License, this list of Conditions, 47 * and the following Disclaimer and Export Compliance provision. In addition, 48 * Licensee must cause all Covered Code to which Licensee contributes to 49 * contain a file documenting the changes Licensee made to create that Covered 50 * Code and the date of any change. Licensee must include in that file the 51 * documentation of any changes made by any predecessor Licensee. Licensee 52 * must include a prominent statement that the modification is derived, 53 * directly or indirectly, from Original Intel Code. 54 * 55 * 3.2. Redistribution of Source with no Rights to Further Distribute Source. 56 * Redistribution of source code of any substantial portion of the Covered 57 * Code or modification without rights to further distribute source must 58 * include the following Disclaimer and Export Compliance provision in the 59 * documentation and/or other materials provided with distribution. In 60 * addition, Licensee may not authorize further sublicense of source of any 61 * portion of the Covered Code, and must include terms to the effect that the 62 * license from Licensee to its licensee is limited to the intellectual 63 * property embodied in the software Licensee provides to its licensee, and 64 * not to intellectual property embodied in modifications its licensee may 65 * make. 66 * 67 * 3.3. Redistribution of Executable. Redistribution in executable form of any 68 * substantial portion of the Covered Code or modification must reproduce the 69 * above Copyright Notice, and the following Disclaimer and Export Compliance 70 * provision in the documentation and/or other materials provided with the 71 * distribution. 72 * 73 * 3.4. Intel retains all right, title, and interest in and to the Original 74 * Intel Code. 75 * 76 * 3.5. Neither the name Intel nor any other trademark owned or controlled by 77 * Intel shall be used in advertising or otherwise to promote the sale, use or 78 * other dealings in products derived from or relating to the Covered Code 79 * without prior written authorization from Intel. 80 * 81 * 4. Disclaimer and Export Compliance 82 * 83 * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED 84 * HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE 85 * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE, 86 * INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY 87 * UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY 88 * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A 89 * PARTICULAR PURPOSE. 90 * 91 * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES 92 * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR 93 * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT, 94 * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY 95 * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL 96 * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS 97 * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY 98 * LIMITED REMEDY. 99 * 100 * 4.3. Licensee shall not export, either directly or indirectly, any of this 101 * software or system incorporating such software without first obtaining any 102 * required license or other approval from the U. S. Department of Commerce or 103 * any other agency or department of the United States Government. In the 104 * event Licensee exports any such software from the United States or 105 * re-exports any such software from a foreign destination, Licensee shall 106 * ensure that the distribution and export/re-export of the software is in 107 * compliance with all laws, regulations, orders, or other restrictions of the 108 * U.S. Export Administration Regulations. Licensee agrees that neither it nor 109 * any of its subsidiaries will export/re-export any technical data, process, 110 * software, or service, directly or indirectly, to any country for which the 111 * United States government or any agency thereof requires an export license, 112 * other governmental approval, or letter of assurance, without first obtaining 113 * such license, approval or letter. 114 * 115 *****************************************************************************/ 116 117 118#define __EVXFACE_C__ 119 120#include "acpi.h" 121#include "acnamesp.h" 122#include "acevents.h" 123#include "acinterp.h" 124 125#define _COMPONENT ACPI_EVENTS 126 ACPI_MODULE_NAME ("evxface") 127 128 129/******************************************************************************* 130 * 131 * FUNCTION: AcpiInstallFixedEventHandler 132 * 133 * PARAMETERS: Event - Event type to enable. 134 * Handler - Pointer to the handler function for the 135 * event 136 * Context - Value passed to the handler on each GPE 137 * 138 * RETURN: Status 139 * 140 * DESCRIPTION: Saves the pointer to the handler function and then enables the 141 * event. 142 * 143 ******************************************************************************/ 144 145ACPI_STATUS 146AcpiInstallFixedEventHandler ( 147 UINT32 Event, 148 ACPI_EVENT_HANDLER Handler, 149 void *Context) 150{ 151 ACPI_STATUS Status; 152 153 154 ACPI_FUNCTION_TRACE ("AcpiInstallFixedEventHandler"); 155 156 157 /* Parameter validation */ 158 159 if (Event > ACPI_EVENT_MAX) 160 { 161 return_ACPI_STATUS (AE_BAD_PARAMETER); 162 } 163 164 Status = AcpiUtAcquireMutex (ACPI_MTX_EVENTS); 165 if (ACPI_FAILURE (Status)) 166 { 167 return_ACPI_STATUS (Status); 168 } 169 170 /* Don't allow two handlers. */ 171 172 if (NULL != AcpiGbl_FixedEventHandlers[Event].Handler) 173 { 174 Status = AE_ALREADY_EXISTS; 175 goto Cleanup; 176 } 177 178 /* Install the handler before enabling the event */ 179 180 AcpiGbl_FixedEventHandlers[Event].Handler = Handler; 181 AcpiGbl_FixedEventHandlers[Event].Context = Context; 182 183 Status = AcpiEnableEvent (Event, 0); 184 if (ACPI_FAILURE (Status)) 185 { 186 ACPI_DEBUG_PRINT ((ACPI_DB_WARN, "Could not enable fixed event.\n")); 187 188 /* Remove the handler */ 189 190 AcpiGbl_FixedEventHandlers[Event].Handler = NULL; 191 AcpiGbl_FixedEventHandlers[Event].Context = NULL; 192 } 193 else 194 { 195 ACPI_DEBUG_PRINT ((ACPI_DB_INFO, 196 "Enabled fixed event %X, Handler=%p\n", Event, Handler)); 197 } 198 199 200Cleanup: 201 (void) AcpiUtReleaseMutex (ACPI_MTX_EVENTS); 202 return_ACPI_STATUS (Status); 203} 204 205 206/******************************************************************************* 207 * 208 * FUNCTION: AcpiRemoveFixedEventHandler 209 * 210 * PARAMETERS: Event - Event type to disable. 211 * Handler - Address of the handler 212 * 213 * RETURN: Status 214 * 215 * DESCRIPTION: Disables the event and unregisters the event handler. 216 * 217 ******************************************************************************/ 218 219ACPI_STATUS 220AcpiRemoveFixedEventHandler ( 221 UINT32 Event, 222 ACPI_EVENT_HANDLER Handler) 223{ 224 ACPI_STATUS Status = AE_OK; 225 226 227 ACPI_FUNCTION_TRACE ("AcpiRemoveFixedEventHandler"); 228 229 230 /* Parameter validation */ 231 232 if (Event > ACPI_EVENT_MAX) 233 { 234 return_ACPI_STATUS (AE_BAD_PARAMETER); 235 } 236 237 Status = AcpiUtAcquireMutex (ACPI_MTX_EVENTS); 238 if (ACPI_FAILURE (Status)) 239 { 240 return_ACPI_STATUS (Status); 241 } 242 243 /* Disable the event before removing the handler */ 244 245 Status = AcpiDisableEvent (Event, 0); 246 247 /* Always Remove the handler */ 248 249 AcpiGbl_FixedEventHandlers[Event].Handler = NULL; 250 AcpiGbl_FixedEventHandlers[Event].Context = NULL; 251 252 if (ACPI_FAILURE (Status)) 253 { 254 ACPI_DEBUG_PRINT ((ACPI_DB_WARN, 255 "Could not write to fixed event enable register.\n")); 256 } 257 else 258 { 259 ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Disabled fixed event %X.\n", Event)); 260 } 261 262 (void) AcpiUtReleaseMutex (ACPI_MTX_EVENTS); 263 return_ACPI_STATUS (Status); 264} 265 266 267/******************************************************************************* 268 * 269 * FUNCTION: AcpiInstallNotifyHandler 270 * 271 * PARAMETERS: Device - The device for which notifies will be handled 272 * HandlerType - The type of handler: 273 * ACPI_SYSTEM_NOTIFY: SystemHandler (00-7f) 274 * ACPI_DEVICE_NOTIFY: DriverHandler (80-ff) 275 * Handler - Address of the handler 276 * Context - Value passed to the handler on each GPE 277 * 278 * RETURN: Status 279 * 280 * DESCRIPTION: Install a handler for notifies on an ACPI device 281 * 282 ******************************************************************************/ 283 284ACPI_STATUS 285AcpiInstallNotifyHandler ( 286 ACPI_HANDLE Device, 287 UINT32 HandlerType, 288 ACPI_NOTIFY_HANDLER Handler, 289 void *Context) 290{ 291 ACPI_OPERAND_OBJECT *ObjDesc; 292 ACPI_OPERAND_OBJECT *NotifyObj; 293 ACPI_NAMESPACE_NODE *Node; 294 ACPI_STATUS Status; 295 296 297 ACPI_FUNCTION_TRACE ("AcpiInstallNotifyHandler"); 298 299 300 /* Parameter validation */ 301 302 if ((!Device) || 303 (!Handler) || 304 (HandlerType > ACPI_MAX_NOTIFY_HANDLER_TYPE)) 305 { 306 return_ACPI_STATUS (AE_BAD_PARAMETER); 307 } 308 309 Status = AcpiUtAcquireMutex (ACPI_MTX_NAMESPACE); 310 if (ACPI_FAILURE (Status)) 311 { 312 return_ACPI_STATUS (Status); 313 } 314 315 /* Convert and validate the device handle */ 316 317 Node = AcpiNsMapHandleToNode (Device); 318 if (!Node) 319 { 320 Status = AE_BAD_PARAMETER; 321 goto UnlockAndExit; 322 } 323 324 /* 325 * Root Object: 326 * Registering a notify handler on the root object indicates that the 327 * caller wishes to receive notifications for all objects. Note that 328 * only one <external> global handler can be regsitered (per notify type). 329 */ 330 if (Device == ACPI_ROOT_OBJECT) 331 { 332 /* Make sure the handler is not already installed */ 333 334 if (((HandlerType == ACPI_SYSTEM_NOTIFY) && 335 AcpiGbl_SystemNotify.Handler) || 336 ((HandlerType == ACPI_DEVICE_NOTIFY) && 337 AcpiGbl_DeviceNotify.Handler)) 338 { 339 Status = AE_ALREADY_EXISTS; 340 goto UnlockAndExit; 341 } 342 343 if (HandlerType == ACPI_SYSTEM_NOTIFY) 344 { 345 AcpiGbl_SystemNotify.Node = Node; 346 AcpiGbl_SystemNotify.Handler = Handler; 347 AcpiGbl_SystemNotify.Context = Context; 348 } 349 else /* ACPI_DEVICE_NOTIFY */ 350 { 351 AcpiGbl_DeviceNotify.Node = Node; 352 AcpiGbl_DeviceNotify.Handler = Handler; 353 AcpiGbl_DeviceNotify.Context = Context; 354 } 355 356 /* Global notify handler installed */ 357 } 358 359 /* 360 * All Other Objects: 361 * Caller will only receive notifications specific to the target object. 362 * Note that only certain object types can receive notifications. 363 */ 364 else 365 { 366 /* Notifies allowed on this object? */ 367 368 if (!AcpiEvIsNotifyObject (Node)) 369 { 370 Status = AE_TYPE; 371 goto UnlockAndExit; 372 } 373 374 /* Check for an existing internal object */ 375 376 ObjDesc = AcpiNsGetAttachedObject (Node); 377 if (ObjDesc) 378 { 379 /* Object exists - make sure there's no handler */ 380 381 if (((HandlerType == ACPI_SYSTEM_NOTIFY) && 382 ObjDesc->CommonNotify.SystemNotify) || 383 ((HandlerType == ACPI_DEVICE_NOTIFY) && 384 ObjDesc->CommonNotify.DeviceNotify)) 385 { 386 Status = AE_ALREADY_EXISTS; 387 goto UnlockAndExit; 388 } 389 } 390 else 391 { 392 /* Create a new object */ 393 394 ObjDesc = AcpiUtCreateInternalObject (Node->Type); 395 if (!ObjDesc) 396 { 397 Status = AE_NO_MEMORY; 398 goto UnlockAndExit; 399 } 400 401 /* Attach new object to the Node */ 402 403 Status = AcpiNsAttachObject (Device, ObjDesc, Node->Type); 404 405 /* Remove local reference to the object */ 406 407 AcpiUtRemoveReference (ObjDesc); 408 409 if (ACPI_FAILURE (Status)) 410 { 411 goto UnlockAndExit; 412 } 413 } 414 415 /* Install the handler */ 416 417 NotifyObj = AcpiUtCreateInternalObject (ACPI_TYPE_LOCAL_NOTIFY); 418 if (!NotifyObj) 419 { 420 Status = AE_NO_MEMORY; 421 goto UnlockAndExit; 422 } 423 424 NotifyObj->Notify.Node = Node; 425 NotifyObj->Notify.Handler = Handler; 426 NotifyObj->Notify.Context = Context; 427 428 if (HandlerType == ACPI_SYSTEM_NOTIFY) 429 { 430 ObjDesc->CommonNotify.SystemNotify = NotifyObj; 431 } 432 else /* ACPI_DEVICE_NOTIFY */ 433 { 434 ObjDesc->CommonNotify.DeviceNotify = NotifyObj; 435 } 436 } 437 438 439UnlockAndExit: 440 (void) AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE); 441 return_ACPI_STATUS (Status); 442} 443 444 445/******************************************************************************* 446 * 447 * FUNCTION: AcpiRemoveNotifyHandler 448 * 449 * PARAMETERS: Device - The device for which notifies will be handled 450 * HandlerType - The type of handler: 451 * ACPI_SYSTEM_NOTIFY: SystemHandler (00-7f) 452 * ACPI_DEVICE_NOTIFY: DriverHandler (80-ff) 453 * Handler - Address of the handler 454 * RETURN: Status 455 * 456 * DESCRIPTION: Remove a handler for notifies on an ACPI device 457 * 458 ******************************************************************************/ 459 460ACPI_STATUS 461AcpiRemoveNotifyHandler ( 462 ACPI_HANDLE Device, 463 UINT32 HandlerType, 464 ACPI_NOTIFY_HANDLER Handler) 465{ 466 ACPI_OPERAND_OBJECT *NotifyObj; 467 ACPI_OPERAND_OBJECT *ObjDesc; 468 ACPI_NAMESPACE_NODE *Node; 469 ACPI_STATUS Status; 470 471 472 ACPI_FUNCTION_TRACE ("AcpiRemoveNotifyHandler"); 473 474 475 /* Parameter validation */ 476 477 if ((!Device) || 478 (!Handler) || 479 (HandlerType > ACPI_MAX_NOTIFY_HANDLER_TYPE)) 480 { 481 return_ACPI_STATUS (AE_BAD_PARAMETER); 482 } 483 484 Status = AcpiUtAcquireMutex (ACPI_MTX_NAMESPACE); 485 if (ACPI_FAILURE (Status)) 486 { 487 return_ACPI_STATUS (Status); 488 } 489 490 /* Convert and validate the device handle */ 491 492 Node = AcpiNsMapHandleToNode (Device); 493 if (!Node) 494 { 495 Status = AE_BAD_PARAMETER; 496 goto UnlockAndExit; 497 } 498 499 /* 500 * Root Object 501 */ 502 if (Device == ACPI_ROOT_OBJECT) 503 { 504 ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Removing notify handler for ROOT object.\n")); 505 506 if (((HandlerType == ACPI_SYSTEM_NOTIFY) && 507 !AcpiGbl_SystemNotify.Handler) || 508 ((HandlerType == ACPI_DEVICE_NOTIFY) && 509 !AcpiGbl_DeviceNotify.Handler)) 510 { 511 Status = AE_NOT_EXIST; 512 goto UnlockAndExit; 513 } 514 515 if (HandlerType == ACPI_SYSTEM_NOTIFY) 516 { 517 AcpiGbl_SystemNotify.Node = NULL; 518 AcpiGbl_SystemNotify.Handler = NULL; 519 AcpiGbl_SystemNotify.Context = NULL; 520 } 521 else 522 { 523 AcpiGbl_DeviceNotify.Node = NULL; 524 AcpiGbl_DeviceNotify.Handler = NULL; 525 AcpiGbl_DeviceNotify.Context = NULL; 526 } 527 } 528 529 /* 530 * All Other Objects 531 */ 532 else 533 { 534 /* Notifies allowed on this object? */ 535 536 if (!AcpiEvIsNotifyObject (Node)) 537 { 538 Status = AE_TYPE; 539 goto UnlockAndExit; 540 } 541 542 /* Check for an existing internal object */ 543 544 ObjDesc = AcpiNsGetAttachedObject (Node); 545 if (!ObjDesc) 546 { 547 Status = AE_NOT_EXIST; 548 goto UnlockAndExit; 549 } 550 551 /* Object exists - make sure there's an existing handler */ 552 553 if (HandlerType == ACPI_SYSTEM_NOTIFY) 554 { 555 NotifyObj = ObjDesc->CommonNotify.SystemNotify; 556 } 557 else 558 { 559 NotifyObj = ObjDesc->CommonNotify.DeviceNotify; 560 } 561 562 if ((!NotifyObj) || 563 (NotifyObj->Notify.Handler != Handler)) 564 { 565 Status = AE_BAD_PARAMETER; 566 goto UnlockAndExit; 567 } 568 569 /* Remove the handler */ 570 571 if (HandlerType == ACPI_SYSTEM_NOTIFY) 572 { 573 ObjDesc->CommonNotify.SystemNotify = NULL; 574 } 575 else 576 { 577 ObjDesc->CommonNotify.DeviceNotify = NULL; 578 } 579 580 AcpiUtRemoveReference (NotifyObj); 581 } 582 583 584UnlockAndExit: 585 (void) AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE); 586 return_ACPI_STATUS (Status); 587} 588 589 590/******************************************************************************* 591 * 592 * FUNCTION: AcpiInstallGpeHandler 593 * 594 * PARAMETERS: GpeNumber - The GPE number within the GPE block 595 * GpeBlock - GPE block (NULL == FADT GPEs) 596 * Type - Whether this GPE should be treated as an 597 * edge- or level-triggered interrupt. 598 * Handler - Address of the handler 599 * Context - Value passed to the handler on each GPE 600 * 601 * RETURN: Status 602 * 603 * DESCRIPTION: Install a handler for a General Purpose Event. 604 * 605 ******************************************************************************/ 606 607ACPI_STATUS 608AcpiInstallGpeHandler ( 609 ACPI_HANDLE GpeDevice, 610 UINT32 GpeNumber, 611 UINT32 Type, 612 ACPI_GPE_HANDLER Handler, 613 void *Context) 614{ 615 ACPI_STATUS Status; 616 ACPI_GPE_EVENT_INFO *GpeEventInfo; 617 618 619 ACPI_FUNCTION_TRACE ("AcpiInstallGpeHandler"); 620 621 622 /* Parameter validation */ 623 624 if (!Handler) 625 { 626 return_ACPI_STATUS (AE_BAD_PARAMETER); 627 } 628 629 Status = AcpiUtAcquireMutex (ACPI_MTX_EVENTS); 630 if (ACPI_FAILURE (Status)) 631 { 632 return_ACPI_STATUS (Status); 633 } 634 635 /* Ensure that we have a valid GPE number */ 636 637 GpeEventInfo = AcpiEvGetGpeEventInfo (GpeDevice, GpeNumber); 638 if (!GpeEventInfo) 639 { 640 Status = AE_BAD_PARAMETER; 641 goto UnlockAndExit; 642 } 643 644 /* Make sure that there isn't a handler there already */ 645 646 if (GpeEventInfo->Handler) 647 { 648 Status = AE_ALREADY_EXISTS; 649 goto UnlockAndExit; 650 } 651 652 /* Install the handler */ 653 654 AcpiOsAcquireLock (AcpiGbl_GpeLock, ACPI_NOT_ISR); 655 GpeEventInfo->Handler = Handler; 656 GpeEventInfo->Context = Context; 657 GpeEventInfo->Flags = (UINT8) Type; 658 AcpiOsReleaseLock (AcpiGbl_GpeLock, ACPI_NOT_ISR); 659 660 /* Clear the GPE (of stale events), the enable it */ 661 662 Status = AcpiHwClearGpe (GpeEventInfo); 663 if (ACPI_FAILURE (Status)) 664 { 665 goto UnlockAndExit; 666 } 667 668 Status = AcpiHwEnableGpe (GpeEventInfo); 669 670 671UnlockAndExit: 672 (void) AcpiUtReleaseMutex (ACPI_MTX_EVENTS); 673 return_ACPI_STATUS (Status); 674} 675 676 677/******************************************************************************* 678 * 679 * FUNCTION: AcpiRemoveGpeHandler 680 * 681 * PARAMETERS: GpeNumber - The event to remove a handler 682 * GpeBlock - GPE block (NULL == FADT GPEs) 683 * Handler - Address of the handler 684 * 685 * RETURN: Status 686 * 687 * DESCRIPTION: Remove a handler for a General Purpose AcpiEvent. 688 * 689 ******************************************************************************/ 690 691ACPI_STATUS 692AcpiRemoveGpeHandler ( 693 ACPI_HANDLE GpeDevice, 694 UINT32 GpeNumber, 695 ACPI_GPE_HANDLER Handler) 696{ 697 ACPI_STATUS Status; 698 ACPI_GPE_EVENT_INFO *GpeEventInfo; 699 700 701 ACPI_FUNCTION_TRACE ("AcpiRemoveGpeHandler"); 702 703 704 /* Parameter validation */ 705 706 if (!Handler) 707 { 708 return_ACPI_STATUS (AE_BAD_PARAMETER); 709 } 710 711 Status = AcpiUtAcquireMutex (ACPI_MTX_EVENTS); 712 if (ACPI_FAILURE (Status)) 713 { 714 return_ACPI_STATUS (Status); 715 } 716 717 /* Ensure that we have a valid GPE number */ 718 719 GpeEventInfo = AcpiEvGetGpeEventInfo (GpeDevice, GpeNumber); 720 if (!GpeEventInfo) 721 { 722 Status = AE_BAD_PARAMETER; 723 goto UnlockAndExit; 724 } 725 726 /* Disable the GPE before removing the handler */ 727 728 Status = AcpiHwDisableGpe (GpeEventInfo); 729 if (ACPI_FAILURE (Status)) 730 { 731 goto UnlockAndExit; 732 } 733 734 /* Make sure that the installed handler is the same */ 735 736 if (GpeEventInfo->Handler != Handler) 737 { 738 (void) AcpiHwEnableGpe (GpeEventInfo); 739 Status = AE_BAD_PARAMETER; 740 goto UnlockAndExit; 741 } 742 743 /* Remove the handler */ 744 745 AcpiOsAcquireLock (AcpiGbl_GpeLock, ACPI_NOT_ISR); 746 GpeEventInfo->Handler = NULL; 747 GpeEventInfo->Context = NULL; 748 AcpiOsReleaseLock (AcpiGbl_GpeLock, ACPI_NOT_ISR); 749 750 751UnlockAndExit: 752 (void) AcpiUtReleaseMutex (ACPI_MTX_EVENTS); 753 return_ACPI_STATUS (Status); 754} 755 756 757/******************************************************************************* 758 * 759 * FUNCTION: AcpiAcquireGlobalLock 760 * 761 * PARAMETERS: Timeout - How long the caller is willing to wait 762 * OutHandle - A handle to the lock if acquired 763 * 764 * RETURN: Status 765 * 766 * DESCRIPTION: Acquire the ACPI Global Lock 767 * 768 ******************************************************************************/ 769 770ACPI_STATUS 771AcpiAcquireGlobalLock ( 772 UINT16 Timeout, 773 UINT32 *Handle) 774{ 775 ACPI_STATUS Status; 776 777 778 if (!Handle) 779 { 780 return (AE_BAD_PARAMETER); 781 } 782 783 Status = AcpiExEnterInterpreter (); 784 if (ACPI_FAILURE (Status)) 785 { 786 return (Status); 787 } 788 789 Status = AcpiEvAcquireGlobalLock (Timeout); 790 AcpiExExitInterpreter (); 791 792 if (ACPI_SUCCESS (Status)) 793 { 794 AcpiGbl_GlobalLockHandle++; 795 *Handle = AcpiGbl_GlobalLockHandle; 796 } 797 798 return (Status); 799} 800 801 802/******************************************************************************* 803 * 804 * FUNCTION: AcpiReleaseGlobalLock 805 * 806 * PARAMETERS: Handle - Returned from AcpiAcquireGlobalLock 807 * 808 * RETURN: Status 809 * 810 * DESCRIPTION: Release the ACPI Global Lock 811 * 812 ******************************************************************************/ 813 814ACPI_STATUS 815AcpiReleaseGlobalLock ( 816 UINT32 Handle) 817{ 818 ACPI_STATUS Status; 819 820 821 if (Handle != AcpiGbl_GlobalLockHandle) 822 { 823 return (AE_NOT_ACQUIRED); 824 } 825 826 Status = AcpiEvReleaseGlobalLock (); 827 return (Status); 828} 829 830 831