evxface.c revision 99679
1/****************************************************************************** 2 * 3 * Module Name: evxface - External interfaces for ACPI events 4 * $Revision: 129 $ 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 * 132 * FUNCTION: AcpiInstallFixedEventHandler 133 * 134 * PARAMETERS: Event - Event type to enable. 135 * Handler - Pointer to the handler function for the 136 * event 137 * Context - Value passed to the handler on each GPE 138 * 139 * RETURN: Status 140 * 141 * DESCRIPTION: Saves the pointer to the handler function and then enables the 142 * event. 143 * 144 ******************************************************************************/ 145 146ACPI_STATUS 147AcpiInstallFixedEventHandler ( 148 UINT32 Event, 149 ACPI_EVENT_HANDLER Handler, 150 void *Context) 151{ 152 ACPI_STATUS Status; 153 154 155 ACPI_FUNCTION_TRACE ("AcpiInstallFixedEventHandler"); 156 157 158 /* Parameter validation */ 159 160 if (Event > ACPI_EVENT_MAX) 161 { 162 return_ACPI_STATUS (AE_BAD_PARAMETER); 163 } 164 165 Status = AcpiUtAcquireMutex (ACPI_MTX_EVENTS); 166 if (ACPI_FAILURE (Status)) 167 { 168 return_ACPI_STATUS (Status); 169 } 170 171 /* Don't allow two handlers. */ 172 173 if (NULL != AcpiGbl_FixedEventHandlers[Event].Handler) 174 { 175 Status = AE_ALREADY_EXISTS; 176 goto Cleanup; 177 } 178 179 /* Install the handler before enabling the event */ 180 181 AcpiGbl_FixedEventHandlers[Event].Handler = Handler; 182 AcpiGbl_FixedEventHandlers[Event].Context = Context; 183 184 Status = AcpiEnableEvent (Event, ACPI_EVENT_FIXED, 0); 185 if (ACPI_FAILURE (Status)) 186 { 187 ACPI_DEBUG_PRINT ((ACPI_DB_WARN, "Could not enable fixed event.\n")); 188 189 /* Remove the handler */ 190 191 AcpiGbl_FixedEventHandlers[Event].Handler = NULL; 192 AcpiGbl_FixedEventHandlers[Event].Context = NULL; 193 } 194 else 195 { 196 ACPI_DEBUG_PRINT ((ACPI_DB_INFO, 197 "Enabled fixed event %X, Handler=%p\n", Event, Handler)); 198 } 199 200 201Cleanup: 202 (void) AcpiUtReleaseMutex (ACPI_MTX_EVENTS); 203 return_ACPI_STATUS (Status); 204} 205 206 207/******************************************************************************* 208 * 209 * FUNCTION: AcpiRemoveFixedEventHandler 210 * 211 * PARAMETERS: Event - Event type to disable. 212 * Handler - Address of the handler 213 * 214 * RETURN: Status 215 * 216 * DESCRIPTION: Disables the event and unregisters the event handler. 217 * 218 ******************************************************************************/ 219 220ACPI_STATUS 221AcpiRemoveFixedEventHandler ( 222 UINT32 Event, 223 ACPI_EVENT_HANDLER Handler) 224{ 225 ACPI_STATUS Status = AE_OK; 226 227 228 ACPI_FUNCTION_TRACE ("AcpiRemoveFixedEventHandler"); 229 230 231 /* Parameter validation */ 232 233 if (Event > ACPI_EVENT_MAX) 234 { 235 return_ACPI_STATUS (AE_BAD_PARAMETER); 236 } 237 238 Status = AcpiUtAcquireMutex (ACPI_MTX_EVENTS); 239 if (ACPI_FAILURE (Status)) 240 { 241 return_ACPI_STATUS (Status); 242 } 243 244 /* Disable the event before removing the handler */ 245 246 Status = AcpiDisableEvent(Event, ACPI_EVENT_FIXED, 0); 247 248 /* Always Remove the handler */ 249 250 AcpiGbl_FixedEventHandlers[Event].Handler = NULL; 251 AcpiGbl_FixedEventHandlers[Event].Context = NULL; 252 253 if (ACPI_FAILURE (Status)) 254 { 255 ACPI_DEBUG_PRINT ((ACPI_DB_WARN, 256 "Could not write to fixed event enable register.\n")); 257 } 258 else 259 { 260 ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Disabled fixed event %X.\n", Event)); 261 } 262 263 (void) AcpiUtReleaseMutex (ACPI_MTX_EVENTS); 264 return_ACPI_STATUS (Status); 265} 266 267 268/******************************************************************************* 269 * 270 * FUNCTION: AcpiInstallNotifyHandler 271 * 272 * PARAMETERS: Device - The device for which notifies will be handled 273 * HandlerType - The type of handler: 274 * ACPI_SYSTEM_NOTIFY: SystemHandler (00-7f) 275 * ACPI_DEVICE_NOTIFY: DriverHandler (80-ff) 276 * Handler - Address of the handler 277 * Context - Value passed to the handler on each GPE 278 * 279 * RETURN: Status 280 * 281 * DESCRIPTION: Install a handler for notifies on an ACPI device 282 * 283 ******************************************************************************/ 284 285ACPI_STATUS 286AcpiInstallNotifyHandler ( 287 ACPI_HANDLE Device, 288 UINT32 HandlerType, 289 ACPI_NOTIFY_HANDLER Handler, 290 void *Context) 291{ 292 ACPI_OPERAND_OBJECT *ObjDesc; 293 ACPI_OPERAND_OBJECT *NotifyObj; 294 ACPI_NAMESPACE_NODE *Node; 295 ACPI_STATUS Status; 296 297 298 ACPI_FUNCTION_TRACE ("AcpiInstallNotifyHandler"); 299 300 301 /* Parameter validation */ 302 303 if ((!Device) || 304 (!Handler) || 305 (HandlerType > ACPI_MAX_NOTIFY_HANDLER_TYPE)) 306 { 307 return_ACPI_STATUS (AE_BAD_PARAMETER); 308 } 309 310 Status = AcpiUtAcquireMutex (ACPI_MTX_NAMESPACE); 311 if (ACPI_FAILURE (Status)) 312 { 313 return_ACPI_STATUS (Status); 314 } 315 316 /* Convert and validate the device handle */ 317 318 Node = AcpiNsMapHandleToNode (Device); 319 if (!Node) 320 { 321 Status = AE_BAD_PARAMETER; 322 goto UnlockAndExit; 323 } 324 325 /* 326 * Root Object: 327 * Registering a notify handler on the root object indicates that the 328 * caller wishes to receive notifications for all objects. Note that 329 * only one <external> global handler can be regsitered (per notify type). 330 */ 331 if (Device == ACPI_ROOT_OBJECT) 332 { 333 /* Make sure the handler is not already installed */ 334 335 if (((HandlerType == ACPI_SYSTEM_NOTIFY) && 336 AcpiGbl_SysNotify.Handler) || 337 ((HandlerType == ACPI_DEVICE_NOTIFY) && 338 AcpiGbl_DrvNotify.Handler)) 339 { 340 Status = AE_ALREADY_EXISTS; 341 goto UnlockAndExit; 342 } 343 344 if (HandlerType == ACPI_SYSTEM_NOTIFY) 345 { 346 AcpiGbl_SysNotify.Node = Node; 347 AcpiGbl_SysNotify.Handler = Handler; 348 AcpiGbl_SysNotify.Context = Context; 349 } 350 else /* ACPI_DEVICE_NOTIFY */ 351 { 352 AcpiGbl_DrvNotify.Node = Node; 353 AcpiGbl_DrvNotify.Handler = Handler; 354 AcpiGbl_DrvNotify.Context = Context; 355 } 356 357 /* Global notify handler installed */ 358 } 359 360 /* 361 * All Other Objects: 362 * Caller will only receive notifications specific to the target object. 363 * Note that only certain object types can receive notifications. 364 */ 365 else 366 { 367 /* Notifies allowed on this object? */ 368 369 if (!AcpiEvIsNotifyObject (Node)) 370 { 371 Status = AE_TYPE; 372 goto UnlockAndExit; 373 } 374 375 /* Check for an existing internal object */ 376 377 ObjDesc = AcpiNsGetAttachedObject (Node); 378 if (ObjDesc) 379 { 380 381 /* Object exists - make sure there's no handler */ 382 383 if (((HandlerType == ACPI_SYSTEM_NOTIFY) && 384 ObjDesc->CommonNotify.SysHandler) || 385 ((HandlerType == ACPI_DEVICE_NOTIFY) && 386 ObjDesc->CommonNotify.DrvHandler)) 387 { 388 Status = AE_ALREADY_EXISTS; 389 goto UnlockAndExit; 390 } 391 } 392 else 393 { 394 /* Create a new object */ 395 396 ObjDesc = AcpiUtCreateInternalObject (Node->Type); 397 if (!ObjDesc) 398 { 399 Status = AE_NO_MEMORY; 400 goto UnlockAndExit; 401 } 402 403 /* Attach new object to the Node */ 404 405 Status = AcpiNsAttachObject (Device, ObjDesc, Node->Type); 406 if (ACPI_FAILURE (Status)) 407 { 408 goto UnlockAndExit; 409 } 410 } 411 412 /* Install the handler */ 413 414 NotifyObj = AcpiUtCreateInternalObject (INTERNAL_TYPE_NOTIFY); 415 if (!NotifyObj) 416 { 417 Status = AE_NO_MEMORY; 418 goto UnlockAndExit; 419 } 420 421 NotifyObj->NotifyHandler.Node = Node; 422 NotifyObj->NotifyHandler.Handler = Handler; 423 NotifyObj->NotifyHandler.Context = Context; 424 425 if (HandlerType == ACPI_SYSTEM_NOTIFY) 426 { 427 ObjDesc->CommonNotify.SysHandler = NotifyObj; 428 } 429 else /* ACPI_DEVICE_NOTIFY */ 430 { 431 ObjDesc->CommonNotify.DrvHandler = NotifyObj; 432 } 433 } 434 435 436UnlockAndExit: 437 (void) AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE); 438 return_ACPI_STATUS (Status); 439} 440 441 442/******************************************************************************* 443 * 444 * FUNCTION: AcpiRemoveNotifyHandler 445 * 446 * PARAMETERS: Device - The device for which notifies will be handled 447 * HandlerType - The type of handler: 448 * ACPI_SYSTEM_NOTIFY: SystemHandler (00-7f) 449 * ACPI_DEVICE_NOTIFY: DriverHandler (80-ff) 450 * Handler - Address of the handler 451 * RETURN: Status 452 * 453 * DESCRIPTION: Remove a handler for notifies on an ACPI device 454 * 455 ******************************************************************************/ 456 457ACPI_STATUS 458AcpiRemoveNotifyHandler ( 459 ACPI_HANDLE Device, 460 UINT32 HandlerType, 461 ACPI_NOTIFY_HANDLER Handler) 462{ 463 ACPI_OPERAND_OBJECT *NotifyObj; 464 ACPI_OPERAND_OBJECT *ObjDesc; 465 ACPI_NAMESPACE_NODE *Node; 466 ACPI_STATUS Status; 467 468 469 ACPI_FUNCTION_TRACE ("AcpiRemoveNotifyHandler"); 470 471 472 /* Parameter validation */ 473 474 if ((!Device) || 475 (!Handler) || 476 (HandlerType > ACPI_MAX_NOTIFY_HANDLER_TYPE)) 477 { 478 return_ACPI_STATUS (AE_BAD_PARAMETER); 479 } 480 481 Status = AcpiUtAcquireMutex (ACPI_MTX_NAMESPACE); 482 if (ACPI_FAILURE (Status)) 483 { 484 return_ACPI_STATUS (Status); 485 } 486 487 /* Convert and validate the device handle */ 488 489 Node = AcpiNsMapHandleToNode (Device); 490 if (!Node) 491 { 492 Status = AE_BAD_PARAMETER; 493 goto UnlockAndExit; 494 } 495 496 /* 497 * Root Object 498 */ 499 if (Device == ACPI_ROOT_OBJECT) 500 { 501 ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Removing notify handler for ROOT object.\n")); 502 503 if (((HandlerType == ACPI_SYSTEM_NOTIFY) && 504 !AcpiGbl_SysNotify.Handler) || 505 ((HandlerType == ACPI_DEVICE_NOTIFY) && 506 !AcpiGbl_DrvNotify.Handler)) 507 { 508 Status = AE_NOT_EXIST; 509 goto UnlockAndExit; 510 } 511 512 if (HandlerType == ACPI_SYSTEM_NOTIFY) 513 { 514 AcpiGbl_SysNotify.Node = NULL; 515 AcpiGbl_SysNotify.Handler = NULL; 516 AcpiGbl_SysNotify.Context = NULL; 517 } 518 else 519 { 520 AcpiGbl_DrvNotify.Node = NULL; 521 AcpiGbl_DrvNotify.Handler = NULL; 522 AcpiGbl_DrvNotify.Context = NULL; 523 } 524 } 525 526 /* 527 * All Other Objects 528 */ 529 else 530 { 531 /* Notifies allowed on this object? */ 532 533 if (!AcpiEvIsNotifyObject (Node)) 534 { 535 Status = AE_TYPE; 536 goto UnlockAndExit; 537 } 538 539 /* Check for an existing internal object */ 540 541 ObjDesc = AcpiNsGetAttachedObject (Node); 542 if (!ObjDesc) 543 { 544 Status = AE_NOT_EXIST; 545 goto UnlockAndExit; 546 } 547 548 /* Object exists - make sure there's an existing handler */ 549 550 if (HandlerType == ACPI_SYSTEM_NOTIFY) 551 { 552 NotifyObj = ObjDesc->CommonNotify.SysHandler; 553 } 554 else 555 { 556 NotifyObj = ObjDesc->CommonNotify.DrvHandler; 557 } 558 559 if ((!NotifyObj) || 560 (NotifyObj->NotifyHandler.Handler != Handler)) 561 { 562 Status = AE_BAD_PARAMETER; 563 goto UnlockAndExit; 564 } 565 566 /* Remove the handler */ 567 568 if (HandlerType == ACPI_SYSTEM_NOTIFY) 569 { 570 ObjDesc->CommonNotify.SysHandler = NULL; 571 } 572 else 573 { 574 ObjDesc->CommonNotify.DrvHandler = NULL; 575 } 576 577 AcpiUtRemoveReference (NotifyObj); 578 } 579 580 581UnlockAndExit: 582 (void) AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE); 583 return_ACPI_STATUS (Status); 584} 585 586 587/******************************************************************************* 588 * 589 * FUNCTION: AcpiInstallGpeHandler 590 * 591 * PARAMETERS: GpeNumber - The GPE number. The numbering scheme is 592 * bank 0 first, then bank 1. 593 * Type - Whether this GPE should be treated as an 594 * edge- or level-triggered interrupt. 595 * Handler - Address of the handler 596 * Context - Value passed to the handler on each GPE 597 * 598 * RETURN: Status 599 * 600 * DESCRIPTION: Install a handler for a General Purpose Event. 601 * 602 ******************************************************************************/ 603 604ACPI_STATUS 605AcpiInstallGpeHandler ( 606 UINT32 GpeNumber, 607 UINT32 Type, 608 ACPI_GPE_HANDLER Handler, 609 void *Context) 610{ 611 ACPI_STATUS Status; 612 UINT32 GpeNumberIndex; 613 614 615 ACPI_FUNCTION_TRACE ("AcpiInstallGpeHandler"); 616 617 618 /* Parameter validation */ 619 620 if (!Handler) 621 { 622 return_ACPI_STATUS (AE_BAD_PARAMETER); 623 } 624 625 /* Ensure that we have a valid GPE number */ 626 627 GpeNumberIndex = AcpiEvGetGpeNumberIndex (GpeNumber); 628 if (GpeNumberIndex == ACPI_GPE_INVALID) 629 { 630 return_ACPI_STATUS (AE_BAD_PARAMETER); 631 } 632 633 Status = AcpiUtAcquireMutex (ACPI_MTX_EVENTS); 634 if (ACPI_FAILURE (Status)) 635 { 636 return_ACPI_STATUS (Status); 637 } 638 639 /* Make sure that there isn't a handler there already */ 640 641 if (AcpiGbl_GpeNumberInfo[GpeNumberIndex].Handler) 642 { 643 Status = AE_ALREADY_EXISTS; 644 goto Cleanup; 645 } 646 647 /* Install the handler */ 648 649 AcpiGbl_GpeNumberInfo[GpeNumberIndex].Handler = Handler; 650 AcpiGbl_GpeNumberInfo[GpeNumberIndex].Context = Context; 651 AcpiGbl_GpeNumberInfo[GpeNumberIndex].Type = (UINT8) Type; 652 653 /* Clear the GPE (of stale events), the enable it */ 654 655 Status = AcpiHwClearGpe (GpeNumber); 656 if (ACPI_FAILURE (Status)) 657 { 658 goto Cleanup; 659 } 660 661 Status = AcpiHwEnableGpe (GpeNumber); 662 663 664Cleanup: 665 (void) AcpiUtReleaseMutex (ACPI_MTX_EVENTS); 666 return_ACPI_STATUS (Status); 667} 668 669 670/******************************************************************************* 671 * 672 * FUNCTION: AcpiRemoveGpeHandler 673 * 674 * PARAMETERS: GpeNumber - The event to remove a handler 675 * Handler - Address of the handler 676 * 677 * RETURN: Status 678 * 679 * DESCRIPTION: Remove a handler for a General Purpose AcpiEvent. 680 * 681 ******************************************************************************/ 682 683ACPI_STATUS 684AcpiRemoveGpeHandler ( 685 UINT32 GpeNumber, 686 ACPI_GPE_HANDLER Handler) 687{ 688 ACPI_STATUS Status; 689 UINT32 GpeNumberIndex; 690 691 692 ACPI_FUNCTION_TRACE ("AcpiRemoveGpeHandler"); 693 694 695 /* Parameter validation */ 696 697 if (!Handler) 698 { 699 return_ACPI_STATUS (AE_BAD_PARAMETER); 700 } 701 702 /* Ensure that we have a valid GPE number */ 703 704 GpeNumberIndex = AcpiEvGetGpeNumberIndex (GpeNumber); 705 if (GpeNumberIndex == ACPI_GPE_INVALID) 706 { 707 return_ACPI_STATUS (AE_BAD_PARAMETER); 708 } 709 710 /* Disable the GPE before removing the handler */ 711 712 Status = AcpiHwDisableGpe (GpeNumber); 713 if (ACPI_FAILURE (Status)) 714 { 715 return_ACPI_STATUS (Status); 716 } 717 718 Status = AcpiUtAcquireMutex (ACPI_MTX_EVENTS); 719 if (ACPI_FAILURE (Status)) 720 { 721 return_ACPI_STATUS (Status); 722 } 723 724 /* Make sure that the installed handler is the same */ 725 726 if (AcpiGbl_GpeNumberInfo[GpeNumberIndex].Handler != Handler) 727 { 728 (void) AcpiHwEnableGpe (GpeNumber); 729 Status = AE_BAD_PARAMETER; 730 goto Cleanup; 731 } 732 733 /* Remove the handler */ 734 735 AcpiGbl_GpeNumberInfo[GpeNumberIndex].Handler = NULL; 736 AcpiGbl_GpeNumberInfo[GpeNumberIndex].Context = NULL; 737 738 739Cleanup: 740 (void) AcpiUtReleaseMutex (ACPI_MTX_EVENTS); 741 return_ACPI_STATUS (Status); 742} 743 744 745/******************************************************************************* 746 * 747 * FUNCTION: AcpiAcquireGlobalLock 748 * 749 * PARAMETERS: Timeout - How long the caller is willing to wait 750 * OutHandle - A handle to the lock if acquired 751 * 752 * RETURN: Status 753 * 754 * DESCRIPTION: Acquire the ACPI Global Lock 755 * 756 ******************************************************************************/ 757 758ACPI_STATUS 759AcpiAcquireGlobalLock ( 760 UINT32 Timeout, 761 UINT32 *Handle) 762{ 763 ACPI_STATUS Status; 764 765 766 if (!Handle) 767 { 768 return (AE_BAD_PARAMETER); 769 } 770 771 Status = AcpiExEnterInterpreter (); 772 if (ACPI_FAILURE (Status)) 773 { 774 return (Status); 775 } 776 777 Status = AcpiEvAcquireGlobalLock (Timeout); 778 AcpiExExitInterpreter (); 779 780 if (ACPI_SUCCESS (Status)) 781 { 782 AcpiGbl_GlobalLockHandle++; 783 *Handle = AcpiGbl_GlobalLockHandle; 784 } 785 786 return (Status); 787} 788 789 790/******************************************************************************* 791 * 792 * FUNCTION: AcpiReleaseGlobalLock 793 * 794 * PARAMETERS: Handle - Returned from AcpiAcquireGlobalLock 795 * 796 * RETURN: Status 797 * 798 * DESCRIPTION: Release the ACPI Global Lock 799 * 800 ******************************************************************************/ 801 802ACPI_STATUS 803AcpiReleaseGlobalLock ( 804 UINT32 Handle) 805{ 806 ACPI_STATUS Status; 807 808 809 if (Handle != AcpiGbl_GlobalLockHandle) 810 { 811 return (AE_NOT_ACQUIRED); 812 } 813 814 Status = AcpiEvReleaseGlobalLock (); 815 return (Status); 816} 817 818 819