evxface.c revision 107325
1/****************************************************************************** 2 * 3 * Module Name: evxface - External interfaces for ACPI events 4 * $Revision: 132 $ 5 * 6 *****************************************************************************/ 7 8/****************************************************************************** 9 * 10 * 1. Copyright Notice 11 * 12 * Some or all of this work - Copyright (c) 1999 - 2002, 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, ACPI_EVENT_FIXED, 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, ACPI_EVENT_FIXED, 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_SysNotify.Handler) || 336 ((HandlerType == ACPI_DEVICE_NOTIFY) && 337 AcpiGbl_DrvNotify.Handler)) 338 { 339 Status = AE_ALREADY_EXISTS; 340 goto UnlockAndExit; 341 } 342 343 if (HandlerType == ACPI_SYSTEM_NOTIFY) 344 { 345 AcpiGbl_SysNotify.Node = Node; 346 AcpiGbl_SysNotify.Handler = Handler; 347 AcpiGbl_SysNotify.Context = Context; 348 } 349 else /* ACPI_DEVICE_NOTIFY */ 350 { 351 AcpiGbl_DrvNotify.Node = Node; 352 AcpiGbl_DrvNotify.Handler = Handler; 353 AcpiGbl_DrvNotify.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 { 379 380 /* Object exists - make sure there's no handler */ 381 382 if (((HandlerType == ACPI_SYSTEM_NOTIFY) && 383 ObjDesc->CommonNotify.SysHandler) || 384 ((HandlerType == ACPI_DEVICE_NOTIFY) && 385 ObjDesc->CommonNotify.DrvHandler)) 386 { 387 Status = AE_ALREADY_EXISTS; 388 goto UnlockAndExit; 389 } 390 } 391 else 392 { 393 /* Create a new object */ 394 395 ObjDesc = AcpiUtCreateInternalObject (Node->Type); 396 if (!ObjDesc) 397 { 398 Status = AE_NO_MEMORY; 399 goto UnlockAndExit; 400 } 401 402 /* Attach new object to the Node */ 403 404 Status = AcpiNsAttachObject (Device, ObjDesc, Node->Type); 405 if (ACPI_FAILURE (Status)) 406 { 407 goto UnlockAndExit; 408 } 409 } 410 411 /* Install the handler */ 412 413 NotifyObj = AcpiUtCreateInternalObject (ACPI_TYPE_LOCAL_NOTIFY); 414 if (!NotifyObj) 415 { 416 Status = AE_NO_MEMORY; 417 goto UnlockAndExit; 418 } 419 420 NotifyObj->NotifyHandler.Node = Node; 421 NotifyObj->NotifyHandler.Handler = Handler; 422 NotifyObj->NotifyHandler.Context = Context; 423 424 if (HandlerType == ACPI_SYSTEM_NOTIFY) 425 { 426 ObjDesc->CommonNotify.SysHandler = NotifyObj; 427 } 428 else /* ACPI_DEVICE_NOTIFY */ 429 { 430 ObjDesc->CommonNotify.DrvHandler = NotifyObj; 431 } 432 } 433 434 435UnlockAndExit: 436 (void) AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE); 437 return_ACPI_STATUS (Status); 438} 439 440 441/******************************************************************************* 442 * 443 * FUNCTION: AcpiRemoveNotifyHandler 444 * 445 * PARAMETERS: Device - The device for which notifies will be handled 446 * HandlerType - The type of handler: 447 * ACPI_SYSTEM_NOTIFY: SystemHandler (00-7f) 448 * ACPI_DEVICE_NOTIFY: DriverHandler (80-ff) 449 * Handler - Address of the handler 450 * RETURN: Status 451 * 452 * DESCRIPTION: Remove a handler for notifies on an ACPI device 453 * 454 ******************************************************************************/ 455 456ACPI_STATUS 457AcpiRemoveNotifyHandler ( 458 ACPI_HANDLE Device, 459 UINT32 HandlerType, 460 ACPI_NOTIFY_HANDLER Handler) 461{ 462 ACPI_OPERAND_OBJECT *NotifyObj; 463 ACPI_OPERAND_OBJECT *ObjDesc; 464 ACPI_NAMESPACE_NODE *Node; 465 ACPI_STATUS Status; 466 467 468 ACPI_FUNCTION_TRACE ("AcpiRemoveNotifyHandler"); 469 470 471 /* Parameter validation */ 472 473 if ((!Device) || 474 (!Handler) || 475 (HandlerType > ACPI_MAX_NOTIFY_HANDLER_TYPE)) 476 { 477 return_ACPI_STATUS (AE_BAD_PARAMETER); 478 } 479 480 Status = AcpiUtAcquireMutex (ACPI_MTX_NAMESPACE); 481 if (ACPI_FAILURE (Status)) 482 { 483 return_ACPI_STATUS (Status); 484 } 485 486 /* Convert and validate the device handle */ 487 488 Node = AcpiNsMapHandleToNode (Device); 489 if (!Node) 490 { 491 Status = AE_BAD_PARAMETER; 492 goto UnlockAndExit; 493 } 494 495 /* 496 * Root Object 497 */ 498 if (Device == ACPI_ROOT_OBJECT) 499 { 500 ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Removing notify handler for ROOT object.\n")); 501 502 if (((HandlerType == ACPI_SYSTEM_NOTIFY) && 503 !AcpiGbl_SysNotify.Handler) || 504 ((HandlerType == ACPI_DEVICE_NOTIFY) && 505 !AcpiGbl_DrvNotify.Handler)) 506 { 507 Status = AE_NOT_EXIST; 508 goto UnlockAndExit; 509 } 510 511 if (HandlerType == ACPI_SYSTEM_NOTIFY) 512 { 513 AcpiGbl_SysNotify.Node = NULL; 514 AcpiGbl_SysNotify.Handler = NULL; 515 AcpiGbl_SysNotify.Context = NULL; 516 } 517 else 518 { 519 AcpiGbl_DrvNotify.Node = NULL; 520 AcpiGbl_DrvNotify.Handler = NULL; 521 AcpiGbl_DrvNotify.Context = NULL; 522 } 523 } 524 525 /* 526 * All Other Objects 527 */ 528 else 529 { 530 /* Notifies allowed on this object? */ 531 532 if (!AcpiEvIsNotifyObject (Node)) 533 { 534 Status = AE_TYPE; 535 goto UnlockAndExit; 536 } 537 538 /* Check for an existing internal object */ 539 540 ObjDesc = AcpiNsGetAttachedObject (Node); 541 if (!ObjDesc) 542 { 543 Status = AE_NOT_EXIST; 544 goto UnlockAndExit; 545 } 546 547 /* Object exists - make sure there's an existing handler */ 548 549 if (HandlerType == ACPI_SYSTEM_NOTIFY) 550 { 551 NotifyObj = ObjDesc->CommonNotify.SysHandler; 552 } 553 else 554 { 555 NotifyObj = ObjDesc->CommonNotify.DrvHandler; 556 } 557 558 if ((!NotifyObj) || 559 (NotifyObj->NotifyHandler.Handler != Handler)) 560 { 561 Status = AE_BAD_PARAMETER; 562 goto UnlockAndExit; 563 } 564 565 /* Remove the handler */ 566 567 if (HandlerType == ACPI_SYSTEM_NOTIFY) 568 { 569 ObjDesc->CommonNotify.SysHandler = NULL; 570 } 571 else 572 { 573 ObjDesc->CommonNotify.DrvHandler = NULL; 574 } 575 576 AcpiUtRemoveReference (NotifyObj); 577 } 578 579 580UnlockAndExit: 581 (void) AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE); 582 return_ACPI_STATUS (Status); 583} 584 585 586/******************************************************************************* 587 * 588 * FUNCTION: AcpiInstallGpeHandler 589 * 590 * PARAMETERS: GpeNumber - The GPE number. The numbering scheme is 591 * bank 0 first, then bank 1. 592 * Type - Whether this GPE should be treated as an 593 * edge- or level-triggered interrupt. 594 * Handler - Address of the handler 595 * Context - Value passed to the handler on each GPE 596 * 597 * RETURN: Status 598 * 599 * DESCRIPTION: Install a handler for a General Purpose Event. 600 * 601 ******************************************************************************/ 602 603ACPI_STATUS 604AcpiInstallGpeHandler ( 605 UINT32 GpeNumber, 606 UINT32 Type, 607 ACPI_GPE_HANDLER Handler, 608 void *Context) 609{ 610 ACPI_STATUS Status; 611 UINT32 GpeNumberIndex; 612 613 614 ACPI_FUNCTION_TRACE ("AcpiInstallGpeHandler"); 615 616 617 /* Parameter validation */ 618 619 if (!Handler) 620 { 621 return_ACPI_STATUS (AE_BAD_PARAMETER); 622 } 623 624 /* Ensure that we have a valid GPE number */ 625 626 GpeNumberIndex = AcpiEvGetGpeNumberIndex (GpeNumber); 627 if (GpeNumberIndex == ACPI_GPE_INVALID) 628 { 629 return_ACPI_STATUS (AE_BAD_PARAMETER); 630 } 631 632 Status = AcpiUtAcquireMutex (ACPI_MTX_EVENTS); 633 if (ACPI_FAILURE (Status)) 634 { 635 return_ACPI_STATUS (Status); 636 } 637 638 /* Make sure that there isn't a handler there already */ 639 640 if (AcpiGbl_GpeNumberInfo[GpeNumberIndex].Handler) 641 { 642 Status = AE_ALREADY_EXISTS; 643 goto Cleanup; 644 } 645 646 /* Install the handler */ 647 648 AcpiGbl_GpeNumberInfo[GpeNumberIndex].Handler = Handler; 649 AcpiGbl_GpeNumberInfo[GpeNumberIndex].Context = Context; 650 AcpiGbl_GpeNumberInfo[GpeNumberIndex].Type = (UINT8) Type; 651 652 /* Clear the GPE (of stale events), the enable it */ 653 654 Status = AcpiHwClearGpe (GpeNumber); 655 if (ACPI_FAILURE (Status)) 656 { 657 goto Cleanup; 658 } 659 660 Status = AcpiHwEnableGpe (GpeNumber); 661 662 663Cleanup: 664 (void) AcpiUtReleaseMutex (ACPI_MTX_EVENTS); 665 return_ACPI_STATUS (Status); 666} 667 668 669/******************************************************************************* 670 * 671 * FUNCTION: AcpiRemoveGpeHandler 672 * 673 * PARAMETERS: GpeNumber - The event to remove a handler 674 * Handler - Address of the handler 675 * 676 * RETURN: Status 677 * 678 * DESCRIPTION: Remove a handler for a General Purpose AcpiEvent. 679 * 680 ******************************************************************************/ 681 682ACPI_STATUS 683AcpiRemoveGpeHandler ( 684 UINT32 GpeNumber, 685 ACPI_GPE_HANDLER Handler) 686{ 687 ACPI_STATUS Status; 688 UINT32 GpeNumberIndex; 689 690 691 ACPI_FUNCTION_TRACE ("AcpiRemoveGpeHandler"); 692 693 694 /* Parameter validation */ 695 696 if (!Handler) 697 { 698 return_ACPI_STATUS (AE_BAD_PARAMETER); 699 } 700 701 /* Ensure that we have a valid GPE number */ 702 703 GpeNumberIndex = AcpiEvGetGpeNumberIndex (GpeNumber); 704 if (GpeNumberIndex == ACPI_GPE_INVALID) 705 { 706 return_ACPI_STATUS (AE_BAD_PARAMETER); 707 } 708 709 /* Disable the GPE before removing the handler */ 710 711 Status = AcpiHwDisableGpe (GpeNumber); 712 if (ACPI_FAILURE (Status)) 713 { 714 return_ACPI_STATUS (Status); 715 } 716 717 Status = AcpiUtAcquireMutex (ACPI_MTX_EVENTS); 718 if (ACPI_FAILURE (Status)) 719 { 720 return_ACPI_STATUS (Status); 721 } 722 723 /* Make sure that the installed handler is the same */ 724 725 if (AcpiGbl_GpeNumberInfo[GpeNumberIndex].Handler != Handler) 726 { 727 (void) AcpiHwEnableGpe (GpeNumber); 728 Status = AE_BAD_PARAMETER; 729 goto Cleanup; 730 } 731 732 /* Remove the handler */ 733 734 AcpiGbl_GpeNumberInfo[GpeNumberIndex].Handler = NULL; 735 AcpiGbl_GpeNumberInfo[GpeNumberIndex].Context = NULL; 736 737 738Cleanup: 739 (void) AcpiUtReleaseMutex (ACPI_MTX_EVENTS); 740 return_ACPI_STATUS (Status); 741} 742 743 744/******************************************************************************* 745 * 746 * FUNCTION: AcpiAcquireGlobalLock 747 * 748 * PARAMETERS: Timeout - How long the caller is willing to wait 749 * OutHandle - A handle to the lock if acquired 750 * 751 * RETURN: Status 752 * 753 * DESCRIPTION: Acquire the ACPI Global Lock 754 * 755 ******************************************************************************/ 756 757ACPI_STATUS 758AcpiAcquireGlobalLock ( 759 UINT16 Timeout, 760 UINT32 *Handle) 761{ 762 ACPI_STATUS Status; 763 764 765 if (!Handle) 766 { 767 return (AE_BAD_PARAMETER); 768 } 769 770 Status = AcpiExEnterInterpreter (); 771 if (ACPI_FAILURE (Status)) 772 { 773 return (Status); 774 } 775 776 Status = AcpiEvAcquireGlobalLock (Timeout); 777 AcpiExExitInterpreter (); 778 779 if (ACPI_SUCCESS (Status)) 780 { 781 AcpiGbl_GlobalLockHandle++; 782 *Handle = AcpiGbl_GlobalLockHandle; 783 } 784 785 return (Status); 786} 787 788 789/******************************************************************************* 790 * 791 * FUNCTION: AcpiReleaseGlobalLock 792 * 793 * PARAMETERS: Handle - Returned from AcpiAcquireGlobalLock 794 * 795 * RETURN: Status 796 * 797 * DESCRIPTION: Release the ACPI Global Lock 798 * 799 ******************************************************************************/ 800 801ACPI_STATUS 802AcpiReleaseGlobalLock ( 803 UINT32 Handle) 804{ 805 ACPI_STATUS Status; 806 807 808 if (Handle != AcpiGbl_GlobalLockHandle) 809 { 810 return (AE_NOT_ACQUIRED); 811 } 812 813 Status = AcpiEvReleaseGlobalLock (); 814 return (Status); 815} 816 817 818