1 /****************************************************************************** 2 * 3 * Module Name: evxface - External interfaces for ACPI events 4 * 5 *****************************************************************************/ 6 7 /****************************************************************************** 8 * 9 * 1. Copyright Notice 10 * 11 * Some or all of this work - Copyright (c) 1999 - 2009, Intel Corp. 12 * All rights reserved. 13 * 14 * 2. License 15 * 16 * 2.1. This is your license from Intel Corp. under its intellectual property 17 * rights. You may have additional license terms from the party that provided 18 * you this software, covering your right to use that party's intellectual 19 * property rights. 20 * 21 * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a 22 * copy of the source code appearing in this file ("Covered Code") an 23 * irrevocable, perpetual, worldwide license under Intel's copyrights in the 24 * base code distributed originally by Intel ("Original Intel Code") to copy, 25 * make derivatives, distribute, use and display any portion of the Covered 26 * Code in any form, with the right to sublicense such rights; and 27 * 28 * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent 29 * license (with the right to sublicense), under only those claims of Intel 30 * patents that are infringed by the Original Intel Code, to make, use, sell, 31 * offer to sell, and import the Covered Code and derivative works thereof 32 * solely to the minimum extent necessary to exercise the above copyright 33 * license, and in no event shall the patent license extend to any additions 34 * to or modifications of the Original Intel Code. No other license or right 35 * is granted directly or by implication, estoppel or otherwise; 36 * 37 * The above copyright and patent license is granted only if the following 38 * conditions are met: 39 * 40 * 3. Conditions 41 * 42 * 3.1. Redistribution of Source with Rights to Further Distribute Source. 43 * Redistribution of source code of any substantial portion of the Covered 44 * Code or modification with rights to further distribute source must include 45 * the above Copyright Notice, the above License, this list of Conditions, 46 * and the following Disclaimer and Export Compliance provision. In addition, 47 * Licensee must cause all Covered Code to which Licensee contributes to 48 * contain a file documenting the changes Licensee made to create that Covered 49 * Code and the date of any change. Licensee must include in that file the 50 * documentation of any changes made by any predecessor Licensee. Licensee 51 * must include a prominent statement that the modification is derived, 52 * directly or indirectly, from Original Intel Code. 53 * 54 * 3.2. Redistribution of Source with no Rights to Further Distribute Source. 55 * Redistribution of source code of any substantial portion of the Covered 56 * Code or modification without rights to further distribute source must 57 * include the following Disclaimer and Export Compliance provision in the 58 * documentation and/or other materials provided with distribution. In 59 * addition, Licensee may not authorize further sublicense of source of any 60 * portion of the Covered Code, and must include terms to the effect that the 61 * license from Licensee to its licensee is limited to the intellectual 62 * property embodied in the software Licensee provides to its licensee, and 63 * not to intellectual property embodied in modifications its licensee may 64 * make. 65 * 66 * 3.3. Redistribution of Executable. Redistribution in executable form of any 67 * substantial portion of the Covered Code or modification must reproduce the 68 * above Copyright Notice, and the following Disclaimer and Export Compliance 69 * provision in the documentation and/or other materials provided with the 70 * distribution. 71 * 72 * 3.4. Intel retains all right, title, and interest in and to the Original 73 * Intel Code. 74 * 75 * 3.5. Neither the name Intel nor any other trademark owned or controlled by 76 * Intel shall be used in advertising or otherwise to promote the sale, use or 77 * other dealings in products derived from or relating to the Covered Code 78 * without prior written authorization from Intel. 79 * 80 * 4. Disclaimer and Export Compliance 81 * 82 * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED 83 * HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE 84 * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE, 85 * INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY 86 * UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY 87 * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A 88 * PARTICULAR PURPOSE. 89 * 90 * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES 91 * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR 92 * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT, 93 * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY 94 * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL 95 * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS 96 * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY 97 * LIMITED REMEDY. 98 * 99 * 4.3. Licensee shall not export, either directly or indirectly, any of this 100 * software or system incorporating such software without first obtaining any 101 * required license or other approval from the U. S. Department of Commerce or 102 * any other agency or department of the United States Government. In the 103 * event Licensee exports any such software from the United States or 104 * re-exports any such software from a foreign destination, Licensee shall 105 * ensure that the distribution and export/re-export of the software is in 106 * compliance with all laws, regulations, orders, or other restrictions of the 107 * U.S. Export Administration Regulations. Licensee agrees that neither it nor 108 * any of its subsidiaries will export/re-export any technical data, process, 109 * software, or service, directly or indirectly, to any country for which the 110 * United States government or any agency thereof requires an export license, 111 * other governmental approval, or letter of assurance, without first obtaining 112 * such license, approval or letter. 113 * 114 *****************************************************************************/ 115 116 117 #define __EVXFACE_C__ 118 119 #include "acpi.h" 120 #include "accommon.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) == 731 ACPI_GPE_DISPATCH_HANDLER) 732 { 733 Status = AE_ALREADY_EXISTS; 734 goto UnlockAndExit; 735 } 736 737 /* Allocate and init handler object */ 738 739 Handler = ACPI_ALLOCATE_ZEROED (sizeof (ACPI_HANDLER_INFO)); 740 if (!Handler) 741 { 742 Status = AE_NO_MEMORY; 743 goto UnlockAndExit; 744 } 745 746 Handler->Address = Address; 747 Handler->Context = Context; 748 Handler->MethodNode = GpeEventInfo->Dispatch.MethodNode; 749 750 /* Disable the GPE before installing the handler */ 751 752 Status = AcpiEvDisableGpe (GpeEventInfo); 753 if (ACPI_FAILURE (Status)) 754 { 755 goto UnlockAndExit; 756 } 757 758 /* Install the handler */ 759 760 Flags = AcpiOsAcquireLock (AcpiGbl_GpeLock); 761 GpeEventInfo->Dispatch.Handler = Handler; 762 763 /* Setup up dispatch flags to indicate handler (vs. method) */ 764 765 GpeEventInfo->Flags &= ~(ACPI_GPE_XRUPT_TYPE_MASK | ACPI_GPE_DISPATCH_MASK); 766 GpeEventInfo->Flags |= (UINT8) (Type | ACPI_GPE_DISPATCH_HANDLER); 767 768 AcpiOsReleaseLock (AcpiGbl_GpeLock, Flags); 769 770 771 UnlockAndExit: 772 (void) AcpiUtReleaseMutex (ACPI_MTX_EVENTS); 773 return_ACPI_STATUS (Status); 774 } 775 776 ACPI_EXPORT_SYMBOL (AcpiInstallGpeHandler) 777 778 779 /******************************************************************************* 780 * 781 * FUNCTION: AcpiRemoveGpeHandler 782 * 783 * PARAMETERS: GpeDevice - Namespace node for the GPE (NULL for FADT 784 * defined GPEs) 785 * GpeNumber - The event to remove a handler 786 * Address - Address of the handler 787 * 788 * RETURN: Status 789 * 790 * DESCRIPTION: Remove a handler for a General Purpose AcpiEvent. 791 * 792 ******************************************************************************/ 793 794 ACPI_STATUS 795 AcpiRemoveGpeHandler ( 796 ACPI_HANDLE GpeDevice, 797 UINT32 GpeNumber, 798 ACPI_EVENT_HANDLER Address) 799 { 800 ACPI_GPE_EVENT_INFO *GpeEventInfo; 801 ACPI_HANDLER_INFO *Handler; 802 ACPI_STATUS Status; 803 ACPI_CPU_FLAGS Flags; 804 805 806 ACPI_FUNCTION_TRACE (AcpiRemoveGpeHandler); 807 808 809 /* Parameter validation */ 810 811 if (!Address) 812 { 813 return_ACPI_STATUS (AE_BAD_PARAMETER); 814 } 815 816 Status = AcpiUtAcquireMutex (ACPI_MTX_EVENTS); 817 if (ACPI_FAILURE (Status)) 818 { 819 return_ACPI_STATUS (Status); 820 } 821 822 /* Ensure that we have a valid GPE number */ 823 824 GpeEventInfo = AcpiEvGetGpeEventInfo (GpeDevice, GpeNumber); 825 if (!GpeEventInfo) 826 { 827 Status = AE_BAD_PARAMETER; 828 goto UnlockAndExit; 829 } 830 831 /* Make sure that a handler is indeed installed */ 832 833 if ((GpeEventInfo->Flags & ACPI_GPE_DISPATCH_MASK) != 834 ACPI_GPE_DISPATCH_HANDLER) 835 { 836 Status = AE_NOT_EXIST; 837 goto UnlockAndExit; 838 } 839 840 /* Make sure that the installed handler is the same */ 841 842 if (GpeEventInfo->Dispatch.Handler->Address != Address) 843 { 844 Status = AE_BAD_PARAMETER; 845 goto UnlockAndExit; 846 } 847 848 /* Disable the GPE before removing the handler */ 849 850 Status = AcpiEvDisableGpe (GpeEventInfo); 851 if (ACPI_FAILURE (Status)) 852 { 853 goto UnlockAndExit; 854 } 855 856 /* Remove the handler */ 857 858 Flags = AcpiOsAcquireLock (AcpiGbl_GpeLock); 859 Handler = GpeEventInfo->Dispatch.Handler; 860 861 /* Restore Method node (if any), set dispatch flags */ 862 863 GpeEventInfo->Dispatch.MethodNode = Handler->MethodNode; 864 GpeEventInfo->Flags &= ~ACPI_GPE_DISPATCH_MASK; /* Clear bits */ 865 if (Handler->MethodNode) 866 { 867 GpeEventInfo->Flags |= ACPI_GPE_DISPATCH_METHOD; 868 } 869 AcpiOsReleaseLock (AcpiGbl_GpeLock, Flags); 870 871 /* Now we can free the handler object */ 872 873 ACPI_FREE (Handler); 874 875 876 UnlockAndExit: 877 (void) AcpiUtReleaseMutex (ACPI_MTX_EVENTS); 878 return_ACPI_STATUS (Status); 879 } 880 881 ACPI_EXPORT_SYMBOL (AcpiRemoveGpeHandler) 882 883 884 /******************************************************************************* 885 * 886 * FUNCTION: AcpiAcquireGlobalLock 887 * 888 * PARAMETERS: Timeout - How long the caller is willing to wait 889 * Handle - Where the handle to the lock is returned 890 * (if acquired) 891 * 892 * RETURN: Status 893 * 894 * DESCRIPTION: Acquire the ACPI Global Lock 895 * 896 * Note: Allows callers with the same thread ID to acquire the global lock 897 * multiple times. In other words, externally, the behavior of the global lock 898 * is identical to an AML mutex. On the first acquire, a new handle is 899 * returned. On any subsequent calls to acquire by the same thread, the same 900 * handle is returned. 901 * 902 ******************************************************************************/ 903 904 ACPI_STATUS 905 AcpiAcquireGlobalLock ( 906 UINT16 Timeout, 907 UINT32 *Handle) 908 { 909 ACPI_STATUS Status; 910 911 912 if (!Handle) 913 { 914 return (AE_BAD_PARAMETER); 915 } 916 917 /* Must lock interpreter to prevent race conditions */ 918 919 AcpiExEnterInterpreter (); 920 921 Status = AcpiExAcquireMutexObject (Timeout, 922 AcpiGbl_GlobalLockMutex, AcpiOsGetThreadId ()); 923 924 if (ACPI_SUCCESS (Status)) 925 { 926 /* Return the global lock handle (updated in AcpiEvAcquireGlobalLock) */ 927 928 *Handle = AcpiGbl_GlobalLockHandle; 929 } 930 931 AcpiExExitInterpreter (); 932 return (Status); 933 } 934 935 ACPI_EXPORT_SYMBOL (AcpiAcquireGlobalLock) 936 937 938 /******************************************************************************* 939 * 940 * FUNCTION: AcpiReleaseGlobalLock 941 * 942 * PARAMETERS: Handle - Returned from AcpiAcquireGlobalLock 943 * 944 * RETURN: Status 945 * 946 * DESCRIPTION: Release the ACPI Global Lock. The handle must be valid. 947 * 948 ******************************************************************************/ 949 950 ACPI_STATUS 951 AcpiReleaseGlobalLock ( 952 UINT32 Handle) 953 { 954 ACPI_STATUS Status; 955 956 957 if (!Handle || (Handle != AcpiGbl_GlobalLockHandle)) 958 { 959 return (AE_NOT_ACQUIRED); 960 } 961 962 Status = AcpiExReleaseMutexObject (AcpiGbl_GlobalLockMutex); 963 return (Status); 964 } 965 966 ACPI_EXPORT_SYMBOL (AcpiReleaseGlobalLock) 967 968