1 /****************************************************************************** 2 * 3 * Module Name: evxface - External interfaces for ACPI events 4 * $Revision: 1.167 $ 5 * 6 *****************************************************************************/ 7 8 /****************************************************************************** 9 * 10 * 1. Copyright Notice 11 * 12 * Some or all of this work - Copyright (c) 1999 - 2008, 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 portion 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: AcpiInstallExceptionHandler 132 * 133 * PARAMETERS: Handler - Pointer to the handler function for the 134 * event 135 * 136 * RETURN: Status 137 * 138 * DESCRIPTION: Saves the pointer to the handler function 139 * 140 ******************************************************************************/ 141 142 ACPI_STATUS 143 AcpiInstallExceptionHandler ( 144 ACPI_EXCEPTION_HANDLER Handler) 145 { 146 ACPI_STATUS Status; 147 148 149 ACPI_FUNCTION_TRACE (AcpiInstallExceptionHandler); 150 151 152 Status = AcpiUtAcquireMutex (ACPI_MTX_EVENTS); 153 if (ACPI_FAILURE (Status)) 154 { 155 return_ACPI_STATUS (Status); 156 } 157 158 /* Don't allow two handlers. */ 159 160 if (AcpiGbl_ExceptionHandler) 161 { 162 Status = AE_ALREADY_EXISTS; 163 goto Cleanup; 164 } 165 166 /* Install the handler */ 167 168 AcpiGbl_ExceptionHandler = Handler; 169 170 Cleanup: 171 (void) AcpiUtReleaseMutex (ACPI_MTX_EVENTS); 172 return_ACPI_STATUS (Status); 173 } 174 175 ACPI_EXPORT_SYMBOL (AcpiInstallExceptionHandler) 176 177 178 /******************************************************************************* 179 * 180 * FUNCTION: AcpiInstallFixedEventHandler 181 * 182 * PARAMETERS: Event - Event type to enable. 183 * Handler - Pointer to the handler function for the 184 * event 185 * Context - Value passed to the handler on each GPE 186 * 187 * RETURN: Status 188 * 189 * DESCRIPTION: Saves the pointer to the handler function and then enables the 190 * event. 191 * 192 ******************************************************************************/ 193 194 ACPI_STATUS 195 AcpiInstallFixedEventHandler ( 196 UINT32 Event, 197 ACPI_EVENT_HANDLER Handler, 198 void *Context) 199 { 200 ACPI_STATUS Status; 201 202 203 ACPI_FUNCTION_TRACE (AcpiInstallFixedEventHandler); 204 205 206 /* Parameter validation */ 207 208 if (Event > ACPI_EVENT_MAX) 209 { 210 return_ACPI_STATUS (AE_BAD_PARAMETER); 211 } 212 213 Status = AcpiUtAcquireMutex (ACPI_MTX_EVENTS); 214 if (ACPI_FAILURE (Status)) 215 { 216 return_ACPI_STATUS (Status); 217 } 218 219 /* Don't allow two handlers. */ 220 221 if (NULL != AcpiGbl_FixedEventHandlers[Event].Handler) 222 { 223 Status = AE_ALREADY_EXISTS; 224 goto Cleanup; 225 } 226 227 /* Install the handler before enabling the event */ 228 229 AcpiGbl_FixedEventHandlers[Event].Handler = Handler; 230 AcpiGbl_FixedEventHandlers[Event].Context = Context; 231 232 Status = AcpiEnableEvent (Event, 0); 233 if (ACPI_FAILURE (Status)) 234 { 235 ACPI_WARNING ((AE_INFO, "Could not enable fixed event %X", Event)); 236 237 /* Remove the handler */ 238 239 AcpiGbl_FixedEventHandlers[Event].Handler = NULL; 240 AcpiGbl_FixedEventHandlers[Event].Context = NULL; 241 } 242 else 243 { 244 ACPI_DEBUG_PRINT ((ACPI_DB_INFO, 245 "Enabled fixed event %X, Handler=%p\n", Event, Handler)); 246 } 247 248 249 Cleanup: 250 (void) AcpiUtReleaseMutex (ACPI_MTX_EVENTS); 251 return_ACPI_STATUS (Status); 252 } 253 254 ACPI_EXPORT_SYMBOL (AcpiInstallFixedEventHandler) 255 256 257 /******************************************************************************* 258 * 259 * FUNCTION: AcpiRemoveFixedEventHandler 260 * 261 * PARAMETERS: Event - Event type to disable. 262 * Handler - Address of the handler 263 * 264 * RETURN: Status 265 * 266 * DESCRIPTION: Disables the event and unregisters the event handler. 267 * 268 ******************************************************************************/ 269 270 ACPI_STATUS 271 AcpiRemoveFixedEventHandler ( 272 UINT32 Event, 273 ACPI_EVENT_HANDLER Handler) 274 { 275 ACPI_STATUS Status = AE_OK; 276 277 278 ACPI_FUNCTION_TRACE (AcpiRemoveFixedEventHandler); 279 280 281 /* Parameter validation */ 282 283 if (Event > ACPI_EVENT_MAX) 284 { 285 return_ACPI_STATUS (AE_BAD_PARAMETER); 286 } 287 288 Status = AcpiUtAcquireMutex (ACPI_MTX_EVENTS); 289 if (ACPI_FAILURE (Status)) 290 { 291 return_ACPI_STATUS (Status); 292 } 293 294 /* Disable the event before removing the handler */ 295 296 Status = AcpiDisableEvent (Event, 0); 297 298 /* Always Remove the handler */ 299 300 AcpiGbl_FixedEventHandlers[Event].Handler = NULL; 301 AcpiGbl_FixedEventHandlers[Event].Context = NULL; 302 303 if (ACPI_FAILURE (Status)) 304 { 305 ACPI_WARNING ((AE_INFO, 306 "Could not write to fixed event enable register %X", Event)); 307 } 308 else 309 { 310 ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Disabled fixed event %X\n", Event)); 311 } 312 313 (void) AcpiUtReleaseMutex (ACPI_MTX_EVENTS); 314 return_ACPI_STATUS (Status); 315 } 316 317 ACPI_EXPORT_SYMBOL (AcpiRemoveFixedEventHandler) 318 319 320 /******************************************************************************* 321 * 322 * FUNCTION: AcpiInstallNotifyHandler 323 * 324 * PARAMETERS: Device - The device for which notifies will be handled 325 * HandlerType - The type of handler: 326 * ACPI_SYSTEM_NOTIFY: SystemHandler (00-7f) 327 * ACPI_DEVICE_NOTIFY: DriverHandler (80-ff) 328 * ACPI_ALL_NOTIFY: both system and device 329 * Handler - Address of the handler 330 * Context - Value passed to the handler on each GPE 331 * 332 * RETURN: Status 333 * 334 * DESCRIPTION: Install a handler for notifies on an ACPI device 335 * 336 ******************************************************************************/ 337 338 ACPI_STATUS 339 AcpiInstallNotifyHandler ( 340 ACPI_HANDLE Device, 341 UINT32 HandlerType, 342 ACPI_NOTIFY_HANDLER Handler, 343 void *Context) 344 { 345 ACPI_OPERAND_OBJECT *ObjDesc; 346 ACPI_OPERAND_OBJECT *NotifyObj; 347 ACPI_NAMESPACE_NODE *Node; 348 ACPI_STATUS Status; 349 350 351 ACPI_FUNCTION_TRACE (AcpiInstallNotifyHandler); 352 353 354 /* Parameter validation */ 355 356 if ((!Device) || 357 (!Handler) || 358 (HandlerType > ACPI_MAX_NOTIFY_HANDLER_TYPE)) 359 { 360 return_ACPI_STATUS (AE_BAD_PARAMETER); 361 } 362 363 Status = AcpiUtAcquireMutex (ACPI_MTX_NAMESPACE); 364 if (ACPI_FAILURE (Status)) 365 { 366 return_ACPI_STATUS (Status); 367 } 368 369 /* Convert and validate the device handle */ 370 371 Node = AcpiNsMapHandleToNode (Device); 372 if (!Node) 373 { 374 Status = AE_BAD_PARAMETER; 375 goto UnlockAndExit; 376 } 377 378 /* 379 * Root Object: 380 * Registering a notify handler on the root object indicates that the 381 * caller wishes to receive notifications for all objects. Note that 382 * only one <external> global handler can be regsitered (per notify type). 383 */ 384 if (Device == ACPI_ROOT_OBJECT) 385 { 386 /* Make sure the handler is not already installed */ 387 388 if (((HandlerType & ACPI_SYSTEM_NOTIFY) && 389 AcpiGbl_SystemNotify.Handler) || 390 ((HandlerType & ACPI_DEVICE_NOTIFY) && 391 AcpiGbl_DeviceNotify.Handler)) 392 { 393 Status = AE_ALREADY_EXISTS; 394 goto UnlockAndExit; 395 } 396 397 if (HandlerType & ACPI_SYSTEM_NOTIFY) 398 { 399 AcpiGbl_SystemNotify.Node = Node; 400 AcpiGbl_SystemNotify.Handler = Handler; 401 AcpiGbl_SystemNotify.Context = Context; 402 } 403 404 if (HandlerType & ACPI_DEVICE_NOTIFY) 405 { 406 AcpiGbl_DeviceNotify.Node = Node; 407 AcpiGbl_DeviceNotify.Handler = Handler; 408 AcpiGbl_DeviceNotify.Context = Context; 409 } 410 411 /* Global notify handler installed */ 412 } 413 414 /* 415 * All Other Objects: 416 * Caller will only receive notifications specific to the target object. 417 * Note that only certain object types can receive notifications. 418 */ 419 else 420 { 421 /* Notifies allowed on this object? */ 422 423 if (!AcpiEvIsNotifyObject (Node)) 424 { 425 Status = AE_TYPE; 426 goto UnlockAndExit; 427 } 428 429 /* Check for an existing internal object */ 430 431 ObjDesc = AcpiNsGetAttachedObject (Node); 432 if (ObjDesc) 433 { 434 /* Object exists - make sure there's no handler */ 435 436 if (((HandlerType & ACPI_SYSTEM_NOTIFY) && 437 ObjDesc->CommonNotify.SystemNotify) || 438 ((HandlerType & ACPI_DEVICE_NOTIFY) && 439 ObjDesc->CommonNotify.DeviceNotify)) 440 { 441 Status = AE_ALREADY_EXISTS; 442 goto UnlockAndExit; 443 } 444 } 445 else 446 { 447 /* Create a new object */ 448 449 ObjDesc = AcpiUtCreateInternalObject (Node->Type); 450 if (!ObjDesc) 451 { 452 Status = AE_NO_MEMORY; 453 goto UnlockAndExit; 454 } 455 456 /* Attach new object to the Node */ 457 458 Status = AcpiNsAttachObject (Device, ObjDesc, Node->Type); 459 460 /* Remove local reference to the object */ 461 462 AcpiUtRemoveReference (ObjDesc); 463 if (ACPI_FAILURE (Status)) 464 { 465 goto UnlockAndExit; 466 } 467 } 468 469 /* Install the handler */ 470 471 NotifyObj = AcpiUtCreateInternalObject (ACPI_TYPE_LOCAL_NOTIFY); 472 if (!NotifyObj) 473 { 474 Status = AE_NO_MEMORY; 475 goto UnlockAndExit; 476 } 477 478 NotifyObj->Notify.Node = Node; 479 NotifyObj->Notify.Handler = Handler; 480 NotifyObj->Notify.Context = Context; 481 482 if (HandlerType & ACPI_SYSTEM_NOTIFY) 483 { 484 ObjDesc->CommonNotify.SystemNotify = NotifyObj; 485 } 486 487 if (HandlerType & ACPI_DEVICE_NOTIFY) 488 { 489 ObjDesc->CommonNotify.DeviceNotify = NotifyObj; 490 } 491 492 if (HandlerType == ACPI_ALL_NOTIFY) 493 { 494 /* Extra ref if installed in both */ 495 496 AcpiUtAddReference (NotifyObj); 497 } 498 } 499 500 501 UnlockAndExit: 502 (void) AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE); 503 return_ACPI_STATUS (Status); 504 } 505 506 ACPI_EXPORT_SYMBOL (AcpiInstallNotifyHandler) 507 508 509 /******************************************************************************* 510 * 511 * FUNCTION: AcpiRemoveNotifyHandler 512 * 513 * PARAMETERS: Device - The device for which notifies will be handled 514 * HandlerType - The type of handler: 515 * ACPI_SYSTEM_NOTIFY: SystemHandler (00-7f) 516 * ACPI_DEVICE_NOTIFY: DriverHandler (80-ff) 517 * ACPI_ALL_NOTIFY: both system and device 518 * Handler - Address of the handler 519 * 520 * RETURN: Status 521 * 522 * DESCRIPTION: Remove a handler for notifies on an ACPI device 523 * 524 ******************************************************************************/ 525 526 ACPI_STATUS 527 AcpiRemoveNotifyHandler ( 528 ACPI_HANDLE Device, 529 UINT32 HandlerType, 530 ACPI_NOTIFY_HANDLER Handler) 531 { 532 ACPI_OPERAND_OBJECT *NotifyObj; 533 ACPI_OPERAND_OBJECT *ObjDesc; 534 ACPI_NAMESPACE_NODE *Node; 535 ACPI_STATUS Status; 536 537 538 ACPI_FUNCTION_TRACE (AcpiRemoveNotifyHandler); 539 540 541 /* Parameter validation */ 542 543 if ((!Device) || 544 (!Handler) || 545 (HandlerType > ACPI_MAX_NOTIFY_HANDLER_TYPE)) 546 { 547 return_ACPI_STATUS (AE_BAD_PARAMETER); 548 } 549 550 Status = AcpiUtAcquireMutex (ACPI_MTX_NAMESPACE); 551 if (ACPI_FAILURE (Status)) 552 { 553 return_ACPI_STATUS (Status); 554 } 555 556 /* Convert and validate the device handle */ 557 558 Node = AcpiNsMapHandleToNode (Device); 559 if (!Node) 560 { 561 Status = AE_BAD_PARAMETER; 562 goto UnlockAndExit; 563 } 564 565 /* Root Object */ 566 567 if (Device == ACPI_ROOT_OBJECT) 568 { 569 ACPI_DEBUG_PRINT ((ACPI_DB_INFO, 570 "Removing notify handler for namespace root object\n")); 571 572 if (((HandlerType & ACPI_SYSTEM_NOTIFY) && 573 !AcpiGbl_SystemNotify.Handler) || 574 ((HandlerType & ACPI_DEVICE_NOTIFY) && 575 !AcpiGbl_DeviceNotify.Handler)) 576 { 577 Status = AE_NOT_EXIST; 578 goto UnlockAndExit; 579 } 580 581 if (HandlerType & ACPI_SYSTEM_NOTIFY) 582 { 583 AcpiGbl_SystemNotify.Node = NULL; 584 AcpiGbl_SystemNotify.Handler = NULL; 585 AcpiGbl_SystemNotify.Context = NULL; 586 } 587 588 if (HandlerType & ACPI_DEVICE_NOTIFY) 589 { 590 AcpiGbl_DeviceNotify.Node = NULL; 591 AcpiGbl_DeviceNotify.Handler = NULL; 592 AcpiGbl_DeviceNotify.Context = NULL; 593 } 594 } 595 596 /* All Other Objects */ 597 598 else 599 { 600 /* Notifies allowed on this object? */ 601 602 if (!AcpiEvIsNotifyObject (Node)) 603 { 604 Status = AE_TYPE; 605 goto UnlockAndExit; 606 } 607 608 /* Check for an existing internal object */ 609 610 ObjDesc = AcpiNsGetAttachedObject (Node); 611 if (!ObjDesc) 612 { 613 Status = AE_NOT_EXIST; 614 goto UnlockAndExit; 615 } 616 617 /* Object exists - make sure there's an existing handler */ 618 619 if (HandlerType & ACPI_SYSTEM_NOTIFY) 620 { 621 NotifyObj = ObjDesc->CommonNotify.SystemNotify; 622 if (!NotifyObj) 623 { 624 Status = AE_NOT_EXIST; 625 goto UnlockAndExit; 626 } 627 628 if (NotifyObj->Notify.Handler != Handler) 629 { 630 Status = AE_BAD_PARAMETER; 631 goto UnlockAndExit; 632 } 633 634 /* Remove the handler */ 635 636 ObjDesc->CommonNotify.SystemNotify = NULL; 637 AcpiUtRemoveReference (NotifyObj); 638 } 639 640 if (HandlerType & ACPI_DEVICE_NOTIFY) 641 { 642 NotifyObj = ObjDesc->CommonNotify.DeviceNotify; 643 if (!NotifyObj) 644 { 645 Status = AE_NOT_EXIST; 646 goto UnlockAndExit; 647 } 648 649 if (NotifyObj->Notify.Handler != Handler) 650 { 651 Status = AE_BAD_PARAMETER; 652 goto UnlockAndExit; 653 } 654 655 /* Remove the handler */ 656 657 ObjDesc->CommonNotify.DeviceNotify = NULL; 658 AcpiUtRemoveReference (NotifyObj); 659 } 660 } 661 662 663 UnlockAndExit: 664 (void) AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE); 665 return_ACPI_STATUS (Status); 666 } 667 668 ACPI_EXPORT_SYMBOL (AcpiRemoveNotifyHandler) 669 670 671 /******************************************************************************* 672 * 673 * FUNCTION: AcpiInstallGpeHandler 674 * 675 * PARAMETERS: GpeDevice - Namespace node for the GPE (NULL for FADT 676 * defined GPEs) 677 * GpeNumber - The GPE number within the GPE block 678 * Type - Whether this GPE should be treated as an 679 * edge- or level-triggered interrupt. 680 * Address - Address of the handler 681 * Context - Value passed to the handler on each GPE 682 * 683 * RETURN: Status 684 * 685 * DESCRIPTION: Install a handler for a General Purpose Event. 686 * 687 ******************************************************************************/ 688 689 ACPI_STATUS 690 AcpiInstallGpeHandler ( 691 ACPI_HANDLE GpeDevice, 692 UINT32 GpeNumber, 693 UINT32 Type, 694 ACPI_EVENT_HANDLER Address, 695 void *Context) 696 { 697 ACPI_GPE_EVENT_INFO *GpeEventInfo; 698 ACPI_HANDLER_INFO *Handler; 699 ACPI_STATUS Status; 700 ACPI_CPU_FLAGS Flags; 701 702 703 ACPI_FUNCTION_TRACE (AcpiInstallGpeHandler); 704 705 706 /* Parameter validation */ 707 708 if ((!Address) || (Type > ACPI_GPE_XRUPT_TYPE_MASK)) 709 { 710 return_ACPI_STATUS (AE_BAD_PARAMETER); 711 } 712 713 Status = AcpiUtAcquireMutex (ACPI_MTX_EVENTS); 714 if (ACPI_FAILURE (Status)) 715 { 716 return_ACPI_STATUS (Status); 717 } 718 719 /* Ensure that we have a valid GPE number */ 720 721 GpeEventInfo = AcpiEvGetGpeEventInfo (GpeDevice, GpeNumber); 722 if (!GpeEventInfo) 723 { 724 Status = AE_BAD_PARAMETER; 725 goto UnlockAndExit; 726 } 727 728 /* Make sure that there isn't a handler there already */ 729 730 if ((GpeEventInfo->Flags & ACPI_GPE_DISPATCH_MASK) == ACPI_GPE_DISPATCH_HANDLER) 731 { 732 Status = AE_ALREADY_EXISTS; 733 goto UnlockAndExit; 734 } 735 736 /* Allocate and init handler object */ 737 738 Handler = ACPI_ALLOCATE_ZEROED (sizeof (ACPI_HANDLER_INFO)); 739 if (!Handler) 740 { 741 Status = AE_NO_MEMORY; 742 goto UnlockAndExit; 743 } 744 745 Handler->Address = Address; 746 Handler->Context = Context; 747 Handler->MethodNode = GpeEventInfo->Dispatch.MethodNode; 748 749 /* Disable the GPE before installing the handler */ 750 751 Status = AcpiEvDisableGpe (GpeEventInfo); 752 if (ACPI_FAILURE (Status)) 753 { 754 goto UnlockAndExit; 755 } 756 757 /* Install the handler */ 758 759 Flags = AcpiOsAcquireLock (AcpiGbl_GpeLock); 760 GpeEventInfo->Dispatch.Handler = Handler; 761 762 /* Setup up dispatch flags to indicate handler (vs. method) */ 763 764 GpeEventInfo->Flags &= ~(ACPI_GPE_XRUPT_TYPE_MASK | ACPI_GPE_DISPATCH_MASK); /* Clear bits */ 765 GpeEventInfo->Flags |= (UINT8) (Type | ACPI_GPE_DISPATCH_HANDLER); 766 767 AcpiOsReleaseLock (AcpiGbl_GpeLock, Flags); 768 769 770 UnlockAndExit: 771 (void) AcpiUtReleaseMutex (ACPI_MTX_EVENTS); 772 return_ACPI_STATUS (Status); 773 } 774 775 ACPI_EXPORT_SYMBOL (AcpiInstallGpeHandler) 776 777 778 /******************************************************************************* 779 * 780 * FUNCTION: AcpiRemoveGpeHandler 781 * 782 * PARAMETERS: GpeDevice - Namespace node for the GPE (NULL for FADT 783 * defined GPEs) 784 * GpeNumber - The event to remove a handler 785 * Address - Address of the handler 786 * 787 * RETURN: Status 788 * 789 * DESCRIPTION: Remove a handler for a General Purpose AcpiEvent. 790 * 791 ******************************************************************************/ 792 793 ACPI_STATUS 794 AcpiRemoveGpeHandler ( 795 ACPI_HANDLE GpeDevice, 796 UINT32 GpeNumber, 797 ACPI_EVENT_HANDLER Address) 798 { 799 ACPI_GPE_EVENT_INFO *GpeEventInfo; 800 ACPI_HANDLER_INFO *Handler; 801 ACPI_STATUS Status; 802 ACPI_CPU_FLAGS Flags; 803 804 805 ACPI_FUNCTION_TRACE (AcpiRemoveGpeHandler); 806 807 808 /* Parameter validation */ 809 810 if (!Address) 811 { 812 return_ACPI_STATUS (AE_BAD_PARAMETER); 813 } 814 815 Status = AcpiUtAcquireMutex (ACPI_MTX_EVENTS); 816 if (ACPI_FAILURE (Status)) 817 { 818 return_ACPI_STATUS (Status); 819 } 820 821 /* Ensure that we have a valid GPE number */ 822 823 GpeEventInfo = AcpiEvGetGpeEventInfo (GpeDevice, GpeNumber); 824 if (!GpeEventInfo) 825 { 826 Status = AE_BAD_PARAMETER; 827 goto UnlockAndExit; 828 } 829 830 /* Make sure that a handler is indeed installed */ 831 832 if ((GpeEventInfo->Flags & ACPI_GPE_DISPATCH_MASK) != ACPI_GPE_DISPATCH_HANDLER) 833 { 834 Status = AE_NOT_EXIST; 835 goto UnlockAndExit; 836 } 837 838 /* Make sure that the installed handler is the same */ 839 840 if (GpeEventInfo->Dispatch.Handler->Address != Address) 841 { 842 Status = AE_BAD_PARAMETER; 843 goto UnlockAndExit; 844 } 845 846 /* Disable the GPE before removing the handler */ 847 848 Status = AcpiEvDisableGpe (GpeEventInfo); 849 if (ACPI_FAILURE (Status)) 850 { 851 goto UnlockAndExit; 852 } 853 854 /* Remove the handler */ 855 856 Flags = AcpiOsAcquireLock (AcpiGbl_GpeLock); 857 Handler = GpeEventInfo->Dispatch.Handler; 858 859 /* Restore Method node (if any), set dispatch flags */ 860 861 GpeEventInfo->Dispatch.MethodNode = Handler->MethodNode; 862 GpeEventInfo->Flags &= ~ACPI_GPE_DISPATCH_MASK; /* Clear bits */ 863 if (Handler->MethodNode) 864 { 865 GpeEventInfo->Flags |= ACPI_GPE_DISPATCH_METHOD; 866 } 867 AcpiOsReleaseLock (AcpiGbl_GpeLock, Flags); 868 869 /* Now we can free the handler object */ 870 871 ACPI_FREE (Handler); 872 873 874 UnlockAndExit: 875 (void) AcpiUtReleaseMutex (ACPI_MTX_EVENTS); 876 return_ACPI_STATUS (Status); 877 } 878 879 ACPI_EXPORT_SYMBOL (AcpiRemoveGpeHandler) 880 881 882 /******************************************************************************* 883 * 884 * FUNCTION: AcpiAcquireGlobalLock 885 * 886 * PARAMETERS: Timeout - How long the caller is willing to wait 887 * Handle - Where the handle to the lock is returned 888 * (if acquired) 889 * 890 * RETURN: Status 891 * 892 * DESCRIPTION: Acquire the ACPI Global Lock 893 * 894 * Note: Allows callers with the same thread ID to acquire the global lock 895 * multiple times. In other words, externally, the behavior of the global lock 896 * is identical to an AML mutex. On the first acquire, a new handle is 897 * returned. On any subsequent calls to acquire by the same thread, the same 898 * handle is returned. 899 * 900 ******************************************************************************/ 901 902 ACPI_STATUS 903 AcpiAcquireGlobalLock ( 904 UINT16 Timeout, 905 UINT32 *Handle) 906 { 907 ACPI_STATUS Status; 908 909 910 if (!Handle) 911 { 912 return (AE_BAD_PARAMETER); 913 } 914 915 /* Must lock interpreter to prevent race conditions */ 916 917 AcpiExEnterInterpreter (); 918 919 Status = AcpiExAcquireMutexObject (Timeout, 920 AcpiGbl_GlobalLockMutex, AcpiOsGetThreadId ()); 921 922 if (ACPI_SUCCESS (Status)) 923 { 924 /* Return the global lock handle (updated in AcpiEvAcquireGlobalLock) */ 925 926 *Handle = AcpiGbl_GlobalLockHandle; 927 } 928 929 AcpiExExitInterpreter (); 930 return (Status); 931 } 932 933 ACPI_EXPORT_SYMBOL (AcpiAcquireGlobalLock) 934 935 936 /******************************************************************************* 937 * 938 * FUNCTION: AcpiReleaseGlobalLock 939 * 940 * PARAMETERS: Handle - Returned from AcpiAcquireGlobalLock 941 * 942 * RETURN: Status 943 * 944 * DESCRIPTION: Release the ACPI Global Lock. The handle must be valid. 945 * 946 ******************************************************************************/ 947 948 ACPI_STATUS 949 AcpiReleaseGlobalLock ( 950 UINT32 Handle) 951 { 952 ACPI_STATUS Status; 953 954 955 if (!Handle || (Handle != AcpiGbl_GlobalLockHandle)) 956 { 957 return (AE_NOT_ACQUIRED); 958 } 959 960 Status = AcpiExReleaseMutexObject (AcpiGbl_GlobalLockMutex); 961 return (Status); 962 } 963 964 ACPI_EXPORT_SYMBOL (AcpiReleaseGlobalLock) 965 966