evxface.c revision 71867
1124758Semax/****************************************************************************** 2124758Semax * 3124758Semax * Module Name: evxface - External interfaces for ACPI events 4124758Semax * $Revision: 101 $ 5124758Semax * 6124758Semax *****************************************************************************/ 7124758Semax 8124758Semax/****************************************************************************** 9124758Semax * 10124758Semax * 1. Copyright Notice 11124758Semax * 12124758Semax * Some or all of this work - Copyright (c) 1999, 2000, 2001, Intel Corp. 13124758Semax * All rights reserved. 14124758Semax * 15124758Semax * 2. License 16124758Semax * 17124758Semax * 2.1. This is your license from Intel Corp. under its intellectual property 18124758Semax * rights. You may have additional license terms from the party that provided 19124758Semax * you this software, covering your right to use that party's intellectual 20124758Semax * property rights. 21124758Semax * 22124758Semax * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a 23124758Semax * copy of the source code appearing in this file ("Covered Code") an 24124758Semax * irrevocable, perpetual, worldwide license under Intel's copyrights in the 25124758Semax * base code distributed originally by Intel ("Original Intel Code") to copy, 26124758Semax * make derivatives, distribute, use and display any portion of the Covered 27124758Semax * Code in any form, with the right to sublicense such rights; and 28124758Semax * 29124758Semax * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent 30124758Semax * license (with the right to sublicense), under only those claims of Intel 31124758Semax * patents that are infringed by the Original Intel Code, to make, use, sell, 32124758Semax * offer to sell, and import the Covered Code and derivative works thereof 33124758Semax * solely to the minimum extent necessary to exercise the above copyright 34124758Semax * license, and in no event shall the patent license extend to any additions 35124758Semax * to or modifications of the Original Intel Code. No other license or right 36124758Semax * is granted directly or by implication, estoppel or otherwise; 37124758Semax * 38124758Semax * The above copyright and patent license is granted only if the following 39124758Semax * conditions are met: 40124758Semax * 41124758Semax * 3. Conditions 42124758Semax * 43124758Semax * 3.1. Redistribution of Source with Rights to Further Distribute Source. 44153176Semax * Redistribution of source code of any substantial prton of the Covered 45153176Semax * Code or modification with rights to further distribute source must include 46124758Semax * the above Copyright Notice, the above License, this list of Conditions, 47124758Semax * and the following Disclaimer and Export Compliance provision. In addition, 48124758Semax * Licensee must cause all Covered Code to which Licensee contributes to 49124758Semax * contain a file documenting the changes Licensee made to create that Covered 50124758Semax * Code and the date of any change. Licensee must include in that file the 51124758Semax * documentation of any changes made by any predecessor Licensee. Licensee 52124758Semax * must include a prominent statement that the modification is derived, 53124758Semax * directly or indirectly, from Original Intel Code. 54124758Semax * 55124758Semax * 3.2. Redistribution of Source with no Rights to Further Distribute Source. 56124758Semax * Redistribution of source code of any substantial portion of the Covered 57124758Semax * Code or modification without rights to further distribute source must 58124758Semax * include the following Disclaimer and Export Compliance provision in the 59124758Semax * documentation and/or other materials provided with distribution. In 60124758Semax * addition, Licensee may not authorize further sublicense of source of any 61124758Semax * portion of the Covered Code, and must include terms to the effect that the 62124758Semax * license from Licensee to its licensee is limited to the intellectual 63124758Semax * property embodied in the software Licensee provides to its licensee, and 64124758Semax * not to intellectual property embodied in modifications its licensee may 65124758Semax * make. 66124758Semax * 67124758Semax * 3.3. Redistribution of Executable. Redistribution in executable form of any 68124758Semax * substantial portion of the Covered Code or modification must reproduce the 69124758Semax * above Copyright Notice, and the following Disclaimer and Export Compliance 70124758Semax * provision in the documentation and/or other materials provided with the 71124758Semax * distribution. 72124758Semax * 73124758Semax * 3.4. Intel retains all right, title, and interest in and to the Original 74124758Semax * Intel Code. 75124758Semax * 76124758Semax * 3.5. Neither the name Intel nor any other trademark owned or controlled by 77124758Semax * Intel shall be used in advertising or otherwise to promote the sale, use or 78124758Semax * other dealings in products derived from or relating to the Covered Code 79124758Semax * without prior written authorization from Intel. 80124758Semax * 81124758Semax * 4. Disclaimer and Export Compliance 82124758Semax * 83124758Semax * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED 84124758Semax * HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE 85124758Semax * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE, 86124758Semax * INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY 87124758Semax * UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY 88124758Semax * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A 89124758Semax * PARTICULAR PURPOSE. 90124758Semax * 91124758Semax * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES 92124758Semax * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR 93124758Semax * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT, 94124758Semax * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY 95124758Semax * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL 96124758Semax * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS 97124758Semax * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY 98124758Semax * LIMITED REMEDY. 99124758Semax * 100124758Semax * 4.3. Licensee shall not export, either directly or indirectly, any of this 101124758Semax * software or system incorporating such software without first obtaining any 102124758Semax * 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 "achware.h" 122#include "acnamesp.h" 123#include "acevents.h" 124#include "amlcode.h" 125#include "acinterp.h" 126 127#define _COMPONENT EVENT_HANDLING 128 MODULE_NAME ("evxface") 129 130 131/****************************************************************************** 132 * 133 * FUNCTION: AcpiInstallFixedEventHandler 134 * 135 * PARAMETERS: Event - Event type to enable. 136 * Handler - Pointer to the handler function for the 137 * event 138 * Context - Value passed to the handler on each GPE 139 * 140 * RETURN: Status 141 * 142 * DESCRIPTION: Saves the pointer to the handler function and then enables the 143 * event. 144 * 145 ******************************************************************************/ 146 147ACPI_STATUS 148AcpiInstallFixedEventHandler ( 149 UINT32 Event, 150 FIXED_EVENT_HANDLER Handler, 151 void *Context) 152{ 153 ACPI_STATUS Status = AE_OK; 154 155 156 FUNCTION_TRACE ("AcpiInstallFixedEventHandler"); 157 158 159 /* Sanity check the parameters. */ 160 161 if (Event >= NUM_FIXED_EVENTS) 162 { 163 return_ACPI_STATUS (AE_BAD_PARAMETER); 164 } 165 166 AcpiCmAcquireMutex (ACPI_MTX_EVENTS); 167 168 /* Don't allow two handlers. */ 169 170 if (NULL != AcpiGbl_FixedEventHandlers[Event].Handler) 171 { 172 Status = AE_EXIST; 173 goto Cleanup; 174 } 175 176 177 /* Install the handler before enabling the event - just in case... */ 178 179 AcpiGbl_FixedEventHandlers[Event].Handler = Handler; 180 AcpiGbl_FixedEventHandlers[Event].Context = Context; 181 182 Status = AcpiEnableEvent(Event, ACPI_EVENT_FIXED); 183 184 if (!ACPI_SUCCESS(Status)) 185 { 186 DEBUG_PRINT (ACPI_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 Status = AE_ERROR; 194 goto Cleanup; 195 } 196 197 DEBUG_PRINT (ACPI_INFO, 198 ("Enabled fixed event %X, Handler=%p\n", Event, Handler)); 199 200 201Cleanup: 202 AcpiCmReleaseMutex (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 FIXED_EVENT_HANDLER Handler) 224{ 225 ACPI_STATUS Status = AE_OK; 226 227 228 FUNCTION_TRACE ("AcpiRemoveFixedEventHandler"); 229 230 231 /* Sanity check the parameters. */ 232 233 if (Event >= NUM_FIXED_EVENTS) 234 { 235 return_ACPI_STATUS (AE_BAD_PARAMETER); 236 } 237 238 AcpiCmAcquireMutex (ACPI_MTX_EVENTS); 239 240 /* Disable the event before removing the handler - just in case... */ 241 242 Status = AcpiDisableEvent(Event, ACPI_EVENT_FIXED); 243 244 if (!ACPI_SUCCESS(Status)) 245 { 246 DEBUG_PRINT (ACPI_WARN, 247 ("Could not write to fixed event enable register.\n")); 248 249 Status = AE_ERROR; 250 AcpiCmReleaseMutex (ACPI_MTX_EVENTS); 251 return_ACPI_STATUS (Status); 252 } 253 254 /* Remove the handler */ 255 256 AcpiGbl_FixedEventHandlers[Event].Handler = NULL; 257 AcpiGbl_FixedEventHandlers[Event].Context = NULL; 258 259 DEBUG_PRINT (ACPI_INFO, ("Disabled fixed event %X.\n", Event)); 260 261 AcpiCmReleaseMutex (ACPI_MTX_EVENTS); 262 return_ACPI_STATUS (Status); 263} 264 265 266/****************************************************************************** 267 * 268 * FUNCTION: AcpiInstallNotifyHandler 269 * 270 * PARAMETERS: Device - The device for which notifies will be handled 271 * HandlerType - The type of handler: 272 * ACPI_SYSTEM_NOTIFY: SystemHandler (00-7f) 273 * ACPI_DEVICE_NOTIFY: DriverHandler (80-ff) 274 * Handler - Address of the handler 275 * Context - Value passed to the handler on each GPE 276 * 277 * RETURN: Status 278 * 279 * DESCRIPTION: Install a handler for notifies on an ACPI device 280 * 281 ******************************************************************************/ 282 283ACPI_STATUS 284AcpiInstallNotifyHandler ( 285 ACPI_HANDLE Device, 286 UINT32 HandlerType, 287 NOTIFY_HANDLER Handler, 288 void *Context) 289{ 290 ACPI_OPERAND_OBJECT *ObjDesc; 291 ACPI_OPERAND_OBJECT *NotifyObj; 292 ACPI_NAMESPACE_NODE *DeviceNode; 293 ACPI_STATUS Status = AE_OK; 294 295 296 FUNCTION_TRACE ("AcpiInstallNotifyHandler"); 297 298 299 /* Parameter validation */ 300 301 if ((!Handler) || 302 (HandlerType > ACPI_MAX_NOTIFY_HANDLER_TYPE)) 303 { 304 return_ACPI_STATUS (AE_BAD_PARAMETER); 305 } 306 307 AcpiCmAcquireMutex (ACPI_MTX_NAMESPACE); 308 309 /* Convert and validate the device handle */ 310 311 DeviceNode = AcpiNsConvertHandleToEntry (Device); 312 if (!DeviceNode) 313 { 314 Status = AE_BAD_PARAMETER; 315 goto UnlockAndExit; 316 } 317 318 /* 319 * Root Object: 320 * ------------ 321 * Registering a notify handler on the root object indicates that the 322 * caller wishes to receive notifications for all objects. Note that 323 * only one <external> global handler can be regsitered (per notify type). 324 */ 325 if (Device == ACPI_ROOT_OBJECT) 326 { 327 /* Make sure the handler is not already installed */ 328 329 if (((HandlerType == ACPI_SYSTEM_NOTIFY) && 330 AcpiGbl_SysNotify.Handler) || 331 ((HandlerType == ACPI_DEVICE_NOTIFY) && 332 AcpiGbl_DrvNotify.Handler)) 333 { 334 Status = AE_EXIST; 335 goto UnlockAndExit; 336 } 337 338 if (HandlerType == ACPI_SYSTEM_NOTIFY) 339 { 340 AcpiGbl_SysNotify.Node = DeviceNode; 341 AcpiGbl_SysNotify.Handler = Handler; 342 AcpiGbl_SysNotify.Context = Context; 343 } 344 else /* ACPI_DEVICE_NOTIFY */ 345 { 346 AcpiGbl_DrvNotify.Node = DeviceNode; 347 AcpiGbl_DrvNotify.Handler = Handler; 348 AcpiGbl_DrvNotify.Context = Context; 349 } 350 351 /* Global notify handler installed */ 352 } 353 354 /* 355 * Other Objects: 356 * -------------- 357 * Caller will only receive notifications specific to the target object. 358 * Note that only certain object types can receive notifications. 359 */ 360 else { 361 /* 362 * These are the ONLY objects that can receive ACPI notifications 363 */ 364 if ((DeviceNode->Type != ACPI_TYPE_DEVICE) && 365 (DeviceNode->Type != ACPI_TYPE_PROCESSOR) && 366 (DeviceNode->Type != ACPI_TYPE_POWER) && 367 (DeviceNode->Type != ACPI_TYPE_THERMAL)) 368 { 369 Status = AE_BAD_PARAMETER; 370 goto UnlockAndExit; 371 } 372 373 /* Check for an existing internal object */ 374 375 ObjDesc = AcpiNsGetAttachedObject ((ACPI_HANDLE) DeviceNode); 376 if (ObjDesc) 377 { 378 379 /* Object exists - make sure there's no handler */ 380 381 if (((HandlerType == ACPI_SYSTEM_NOTIFY) && 382 ObjDesc->Device.SysHandler) || 383 ((HandlerType == ACPI_DEVICE_NOTIFY) && 384 ObjDesc->Device.DrvHandler)) 385 { 386 Status = AE_EXIST; 387 goto UnlockAndExit; 388 } 389 } 390 391 else 392 { 393 /* Create a new object */ 394 395 ObjDesc = AcpiCmCreateInternalObject (DeviceNode->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, (UINT8) DeviceNode->Type); 405 406 if (ACPI_FAILURE (Status)) 407 { 408 goto UnlockAndExit; 409 } 410 } 411 412 /* Install the handler */ 413 414 NotifyObj = AcpiCmCreateInternalObject (INTERNAL_TYPE_NOTIFY); 415 if (!NotifyObj) 416 { 417 Status = AE_NO_MEMORY; 418 goto UnlockAndExit; 419 } 420 421 NotifyObj->NotifyHandler.Node = DeviceNode; 422 NotifyObj->NotifyHandler.Handler = Handler; 423 NotifyObj->NotifyHandler.Context = Context; 424 425 426 if (HandlerType == ACPI_SYSTEM_NOTIFY) 427 { 428 ObjDesc->Device.SysHandler = NotifyObj; 429 } 430 else /* ACPI_DEVICE_NOTIFY */ 431 { 432 ObjDesc->Device.DrvHandler = NotifyObj; 433 } 434 } 435 436UnlockAndExit: 437 AcpiCmReleaseMutex (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 NOTIFY_HANDLER Handler) 462{ 463 ACPI_OPERAND_OBJECT *NotifyObj; 464 ACPI_OPERAND_OBJECT *ObjDesc; 465 ACPI_NAMESPACE_NODE *DeviceNode; 466 ACPI_STATUS Status = AE_OK; 467 468 FUNCTION_TRACE ("AcpiRemoveNotifyHandler"); 469 470 /* Parameter validation */ 471 472 if ((!Handler) || 473 (HandlerType > ACPI_MAX_NOTIFY_HANDLER_TYPE)) 474 { 475 return_ACPI_STATUS (AE_BAD_PARAMETER); 476 } 477 478 AcpiCmAcquireMutex (ACPI_MTX_NAMESPACE); 479 480 /* Convert and validate the device handle */ 481 482 DeviceNode = AcpiNsConvertHandleToEntry (Device); 483 if (!DeviceNode) 484 { 485 Status = AE_BAD_PARAMETER; 486 goto UnlockAndExit; 487 } 488 489 /* 490 * Root Object: 491 * ------------ 492 */ 493 if (Device == ACPI_ROOT_OBJECT) { 494 495 DEBUG_PRINT(ACPI_INFO, ("Removing notify handler for ROOT object.\n")); 496 497 if (((HandlerType == ACPI_SYSTEM_NOTIFY) && 498 !AcpiGbl_SysNotify.Handler) || 499 ((HandlerType == ACPI_DEVICE_NOTIFY) && 500 !AcpiGbl_DrvNotify.Handler)) 501 { 502 Status = AE_NOT_EXIST; 503 goto UnlockAndExit; 504 } 505 506 if (HandlerType == ACPI_SYSTEM_NOTIFY) { 507 AcpiGbl_SysNotify.Node = NULL; 508 AcpiGbl_SysNotify.Handler = NULL; 509 AcpiGbl_SysNotify.Context = NULL; 510 } 511 else { 512 AcpiGbl_DrvNotify.Node = NULL; 513 AcpiGbl_DrvNotify.Handler = NULL; 514 AcpiGbl_DrvNotify.Context = NULL; 515 } 516 } 517 518 /* 519 * Other Objects: 520 * -------------- 521 */ 522 else { 523 /* 524 * These are the ONLY objects that can receive ACPI notifications 525 */ 526 if ((DeviceNode->Type != ACPI_TYPE_DEVICE) && 527 (DeviceNode->Type != ACPI_TYPE_PROCESSOR) && 528 (DeviceNode->Type != ACPI_TYPE_POWER) && 529 (DeviceNode->Type != ACPI_TYPE_THERMAL)) 530 { 531 Status = AE_BAD_PARAMETER; 532 goto UnlockAndExit; 533 } 534 535 /* Check for an existing internal object */ 536 537 ObjDesc = AcpiNsGetAttachedObject ((ACPI_HANDLE) DeviceNode); 538 if (!ObjDesc) 539 { 540 Status = AE_NOT_EXIST; 541 goto UnlockAndExit; 542 } 543 544 /* Object exists - make sure there's an existing handler */ 545 546 if (HandlerType == ACPI_SYSTEM_NOTIFY) 547 { 548 NotifyObj = ObjDesc->Device.SysHandler; 549 } 550 else 551 { 552 NotifyObj = ObjDesc->Device.DrvHandler; 553 } 554 555 if ((!NotifyObj) || 556 (NotifyObj->NotifyHandler.Handler != Handler)) 557 { 558 Status = AE_BAD_PARAMETER; 559 goto UnlockAndExit; 560 } 561 562 /* Remove the handler */ 563 564 if (HandlerType == ACPI_SYSTEM_NOTIFY) 565 { 566 ObjDesc->Device.SysHandler = NULL; 567 } 568 else 569 { 570 ObjDesc->Device.DrvHandler = NULL; 571 } 572 573 AcpiCmRemoveReference (NotifyObj); 574 } 575 576 577UnlockAndExit: 578 AcpiCmReleaseMutex (ACPI_MTX_NAMESPACE); 579 return_ACPI_STATUS (Status); 580} 581 582 583/****************************************************************************** 584 * 585 * FUNCTION: AcpiInstallGpeHandler 586 * 587 * PARAMETERS: GpeNumber - The GPE number. The numbering scheme is 588 * bank 0 first, then bank 1. 589 * Type - Whether this GPE should be treated as an 590 * edge- or level-triggered interrupt. 591 * Handler - Address of the handler 592 * Context - Value passed to the handler on each GPE 593 * 594 * RETURN: Status 595 * 596 * DESCRIPTION: Install a handler for a General Purpose Event. 597 * 598 ******************************************************************************/ 599 600ACPI_STATUS 601AcpiInstallGpeHandler ( 602 UINT32 GpeNumber, 603 UINT32 Type, 604 GPE_HANDLER Handler, 605 void *Context) 606{ 607 ACPI_STATUS Status = AE_OK; 608 609 FUNCTION_TRACE ("AcpiInstallGpeHandler"); 610 611 /* Parameter validation */ 612 613 if (!Handler || (GpeNumber > NUM_GPE)) 614 { 615 return_ACPI_STATUS (AE_BAD_PARAMETER); 616 } 617 618 /* Ensure that we have a valid GPE number */ 619 620 if (AcpiGbl_GpeValid[GpeNumber] == ACPI_GPE_INVALID) 621 { 622 return_ACPI_STATUS (AE_BAD_PARAMETER); 623 } 624 625 AcpiCmAcquireMutex (ACPI_MTX_EVENTS); 626 627 /* Make sure that there isn't a handler there already */ 628 629 if (AcpiGbl_GpeInfo[GpeNumber].Handler) 630 { 631 Status = AE_EXIST; 632 goto Cleanup; 633 } 634 635 /* Install the handler */ 636 637 AcpiGbl_GpeInfo[GpeNumber].Handler = Handler; 638 AcpiGbl_GpeInfo[GpeNumber].Context = Context; 639 AcpiGbl_GpeInfo[GpeNumber].Type = (UINT8) Type; 640 641 /* Clear the GPE (of stale events), the enable it */ 642 643 AcpiHwClearGpe (GpeNumber); 644 AcpiHwEnableGpe (GpeNumber); 645 646Cleanup: 647 AcpiCmReleaseMutex (ACPI_MTX_EVENTS); 648 return_ACPI_STATUS (Status); 649} 650 651 652/****************************************************************************** 653 * 654 * FUNCTION: AcpiRemoveGpeHandler 655 * 656 * PARAMETERS: GpeNumber - The event to remove a handler 657 * Handler - Address of the handler 658 * 659 * RETURN: Status 660 * 661 * DESCRIPTION: Remove a handler for a General Purpose AcpiEvent. 662 * 663 ******************************************************************************/ 664 665ACPI_STATUS 666AcpiRemoveGpeHandler ( 667 UINT32 GpeNumber, 668 GPE_HANDLER Handler) 669{ 670 ACPI_STATUS Status = AE_OK; 671 672 673 FUNCTION_TRACE ("AcpiRemoveGpeHandler"); 674 675 676 /* Parameter validation */ 677 678 if (!Handler || (GpeNumber > NUM_GPE)) 679 { 680 return_ACPI_STATUS (AE_BAD_PARAMETER); 681 } 682 683 /* Ensure that we have a valid GPE number */ 684 685 if (AcpiGbl_GpeValid[GpeNumber] == ACPI_GPE_INVALID) 686 { 687 return_ACPI_STATUS (AE_BAD_PARAMETER); 688 } 689 690 /* Disable the GPE before removing the handler */ 691 692 AcpiHwDisableGpe (GpeNumber); 693 694 AcpiCmAcquireMutex (ACPI_MTX_EVENTS); 695 696 /* Make sure that the installed handler is the same */ 697 698 if (AcpiGbl_GpeInfo[GpeNumber].Handler != Handler) 699 { 700 AcpiHwEnableGpe (GpeNumber); 701 Status = AE_BAD_PARAMETER; 702 goto Cleanup; 703 } 704 705 /* Remove the handler */ 706 707 AcpiGbl_GpeInfo[GpeNumber].Handler = NULL; 708 AcpiGbl_GpeInfo[GpeNumber].Context = NULL; 709 710Cleanup: 711 AcpiCmReleaseMutex (ACPI_MTX_EVENTS); 712 return_ACPI_STATUS (Status); 713} 714 715 716/****************************************************************************** 717 * 718 * FUNCTION: AcpiAcquireGlobalLock 719 * 720 * PARAMETERS: Timeout - How long the caller is willing to wait 721 * OutHandle - A handle to the lock if acquired 722 * 723 * RETURN: Status 724 * 725 * DESCRIPTION: Acquire the ACPI Global Lock 726 * 727 ******************************************************************************/ 728ACPI_STATUS 729AcpiAcquireGlobalLock ( 730 void) 731{ 732 ACPI_STATUS Status; 733 734 735 AcpiAmlEnterInterpreter (); 736 737 /* 738 * TBD: [Restructure] add timeout param to internal interface, and 739 * perhaps INTERPRETER_LOCKED 740 */ 741 742 Status = AcpiEvAcquireGlobalLock (); 743 AcpiAmlExitInterpreter (); 744 745 return (Status); 746} 747 748 749/****************************************************************************** 750 * 751 * FUNCTION: AcpiReleaseGlobalLock 752 * 753 * PARAMETERS: Handle - Returned from AcpiAcquireGlobalLock 754 * 755 * RETURN: Status 756 * 757 * DESCRIPTION: Release the ACPI Global Lock 758 * 759 ******************************************************************************/ 760 761ACPI_STATUS 762AcpiReleaseGlobalLock ( 763 void) 764{ 765 AcpiEvReleaseGlobalLock (); 766 return (AE_OK); 767} 768 769 770