1 /******************************************************************************* 2 * 3 * Module Name: nsxfeval - Public interfaces to the ACPI subsystem 4 * ACPI Object evaluation interfaces 5 * 6 ******************************************************************************/ 7 8 /* 9 * Copyright (C) 2000 - 2013, Intel Corp. 10 * All rights reserved. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions, and the following disclaimer, 17 * without modification. 18 * 2. Redistributions in binary form must reproduce at minimum a disclaimer 19 * substantially similar to the "NO WARRANTY" disclaimer below 20 * ("Disclaimer") and any redistribution must be conditioned upon 21 * including a substantially similar Disclaimer requirement for further 22 * binary redistribution. 23 * 3. Neither the names of the above-listed copyright holders nor the names 24 * of any contributors may be used to endorse or promote products derived 25 * from this software without specific prior written permission. 26 * 27 * Alternatively, this software may be distributed under the terms of the 28 * GNU General Public License ("GPL") version 2 as published by the Free 29 * Software Foundation. 30 * 31 * NO WARRANTY 32 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 33 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 34 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR 35 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 36 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 37 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 38 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 39 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 40 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 41 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 42 * POSSIBILITY OF SUCH DAMAGES. 43 */ 44 45 46 #define __NSXFEVAL_C__ 47 48 #include <contrib/dev/acpica/include/acpi.h> 49 #include <contrib/dev/acpica/include/accommon.h> 50 #include <contrib/dev/acpica/include/acnamesp.h> 51 #include <contrib/dev/acpica/include/acinterp.h> 52 53 54 #define _COMPONENT ACPI_NAMESPACE 55 ACPI_MODULE_NAME ("nsxfeval") 56 57 /* Local prototypes */ 58 59 static void 60 AcpiNsResolveReferences ( 61 ACPI_EVALUATE_INFO *Info); 62 63 64 /******************************************************************************* 65 * 66 * FUNCTION: AcpiEvaluateObjectTyped 67 * 68 * PARAMETERS: Handle - Object handle (optional) 69 * Pathname - Object pathname (optional) 70 * ExternalParams - List of parameters to pass to method, 71 * terminated by NULL. May be NULL 72 * if no parameters are being passed. 73 * ReturnBuffer - Where to put method's return value (if 74 * any). If NULL, no value is returned. 75 * ReturnType - Expected type of return object 76 * 77 * RETURN: Status 78 * 79 * DESCRIPTION: Find and evaluate the given object, passing the given 80 * parameters if necessary. One of "Handle" or "Pathname" must 81 * be valid (non-null) 82 * 83 ******************************************************************************/ 84 85 ACPI_STATUS 86 AcpiEvaluateObjectTyped ( 87 ACPI_HANDLE Handle, 88 ACPI_STRING Pathname, 89 ACPI_OBJECT_LIST *ExternalParams, 90 ACPI_BUFFER *ReturnBuffer, 91 ACPI_OBJECT_TYPE ReturnType) 92 { 93 ACPI_STATUS Status; 94 BOOLEAN MustFree = FALSE; 95 96 97 ACPI_FUNCTION_TRACE (AcpiEvaluateObjectTyped); 98 99 100 /* Return buffer must be valid */ 101 102 if (!ReturnBuffer) 103 { 104 return_ACPI_STATUS (AE_BAD_PARAMETER); 105 } 106 107 if (ReturnBuffer->Length == ACPI_ALLOCATE_BUFFER) 108 { 109 MustFree = TRUE; 110 } 111 112 /* Evaluate the object */ 113 114 Status = AcpiEvaluateObject (Handle, Pathname, ExternalParams, ReturnBuffer); 115 if (ACPI_FAILURE (Status)) 116 { 117 return_ACPI_STATUS (Status); 118 } 119 120 /* Type ANY means "don't care" */ 121 122 if (ReturnType == ACPI_TYPE_ANY) 123 { 124 return_ACPI_STATUS (AE_OK); 125 } 126 127 if (ReturnBuffer->Length == 0) 128 { 129 /* Error because caller specifically asked for a return value */ 130 131 ACPI_ERROR ((AE_INFO, "No return value")); 132 return_ACPI_STATUS (AE_NULL_OBJECT); 133 } 134 135 /* Examine the object type returned from EvaluateObject */ 136 137 if (((ACPI_OBJECT *) ReturnBuffer->Pointer)->Type == ReturnType) 138 { 139 return_ACPI_STATUS (AE_OK); 140 } 141 142 /* Return object type does not match requested type */ 143 144 ACPI_ERROR ((AE_INFO, 145 "Incorrect return type [%s] requested [%s]", 146 AcpiUtGetTypeName (((ACPI_OBJECT *) ReturnBuffer->Pointer)->Type), 147 AcpiUtGetTypeName (ReturnType))); 148 149 if (MustFree) 150 { 151 /* Caller used ACPI_ALLOCATE_BUFFER, free the return buffer */ 152 153 AcpiOsFree (ReturnBuffer->Pointer); 154 ReturnBuffer->Pointer = NULL; 155 } 156 157 ReturnBuffer->Length = 0; 158 return_ACPI_STATUS (AE_TYPE); 159 } 160 161 ACPI_EXPORT_SYMBOL (AcpiEvaluateObjectTyped) 162 163 164 /******************************************************************************* 165 * 166 * FUNCTION: AcpiEvaluateObject 167 * 168 * PARAMETERS: Handle - Object handle (optional) 169 * Pathname - Object pathname (optional) 170 * ExternalParams - List of parameters to pass to method, 171 * terminated by NULL. May be NULL 172 * if no parameters are being passed. 173 * ReturnBuffer - Where to put method's return value (if 174 * any). If NULL, no value is returned. 175 * 176 * RETURN: Status 177 * 178 * DESCRIPTION: Find and evaluate the given object, passing the given 179 * parameters if necessary. One of "Handle" or "Pathname" must 180 * be valid (non-null) 181 * 182 ******************************************************************************/ 183 184 ACPI_STATUS 185 AcpiEvaluateObject ( 186 ACPI_HANDLE Handle, 187 ACPI_STRING Pathname, 188 ACPI_OBJECT_LIST *ExternalParams, 189 ACPI_BUFFER *ReturnBuffer) 190 { 191 ACPI_STATUS Status; 192 ACPI_EVALUATE_INFO *Info; 193 ACPI_SIZE BufferSpaceNeeded; 194 UINT32 i; 195 196 197 ACPI_FUNCTION_TRACE (AcpiEvaluateObject); 198 199 200 /* Allocate and initialize the evaluation information block */ 201 202 Info = ACPI_ALLOCATE_ZEROED (sizeof (ACPI_EVALUATE_INFO)); 203 if (!Info) 204 { 205 return_ACPI_STATUS (AE_NO_MEMORY); 206 } 207 208 /* Convert and validate the device handle */ 209 210 Info->PrefixNode = AcpiNsValidateHandle (Handle); 211 if (!Info->PrefixNode) 212 { 213 Status = AE_BAD_PARAMETER; 214 goto Cleanup; 215 } 216 217 /* 218 * Get the actual namespace node for the target object. 219 * Handles these cases: 220 * 221 * 1) Null node, valid pathname from root (absolute path) 222 * 2) Node and valid pathname (path relative to Node) 223 * 3) Node, Null pathname 224 */ 225 if ((Pathname) && 226 (ACPI_IS_ROOT_PREFIX (Pathname[0]))) 227 { 228 /* The path is fully qualified, just evaluate by name */ 229 230 Info->PrefixNode = NULL; 231 } 232 else if (!Handle) 233 { 234 /* 235 * A handle is optional iff a fully qualified pathname is specified. 236 * Since we've already handled fully qualified names above, this is 237 * an error. 238 */ 239 if (!Pathname) 240 { 241 ACPI_DEBUG_PRINT ((ACPI_DB_INFO, 242 "Both Handle and Pathname are NULL")); 243 } 244 else 245 { 246 ACPI_DEBUG_PRINT ((ACPI_DB_INFO, 247 "Null Handle with relative pathname [%s]", Pathname)); 248 } 249 250 Status = AE_BAD_PARAMETER; 251 goto Cleanup; 252 } 253 254 Info->RelativePathname = Pathname; 255 256 /* 257 * Convert all external objects passed as arguments to the 258 * internal version(s). 259 */ 260 if (ExternalParams && ExternalParams->Count) 261 { 262 Info->ParamCount = (UINT16) ExternalParams->Count; 263 264 /* Warn on impossible argument count */ 265 266 if (Info->ParamCount > ACPI_METHOD_NUM_ARGS) 267 { 268 ACPI_WARN_PREDEFINED ((AE_INFO, Pathname, ACPI_WARN_ALWAYS, 269 "Excess arguments (%u) - using only %u", 270 Info->ParamCount, ACPI_METHOD_NUM_ARGS)); 271 272 Info->ParamCount = ACPI_METHOD_NUM_ARGS; 273 } 274 275 /* 276 * Allocate a new parameter block for the internal objects 277 * Add 1 to count to allow for null terminated internal list 278 */ 279 Info->Parameters = ACPI_ALLOCATE_ZEROED ( 280 ((ACPI_SIZE) Info->ParamCount + 1) * sizeof (void *)); 281 if (!Info->Parameters) 282 { 283 Status = AE_NO_MEMORY; 284 goto Cleanup; 285 } 286 287 /* Convert each external object in the list to an internal object */ 288 289 for (i = 0; i < Info->ParamCount; i++) 290 { 291 Status = AcpiUtCopyEobjectToIobject ( 292 &ExternalParams->Pointer[i], &Info->Parameters[i]); 293 if (ACPI_FAILURE (Status)) 294 { 295 goto Cleanup; 296 } 297 } 298 299 Info->Parameters[Info->ParamCount] = NULL; 300 } 301 302 303 #if 0 304 305 /* 306 * Begin incoming argument count analysis. Check for too few args 307 * and too many args. 308 */ 309 310 switch (AcpiNsGetType (Info->Node)) 311 { 312 case ACPI_TYPE_METHOD: 313 314 /* Check incoming argument count against the method definition */ 315 316 if (Info->ObjDesc->Method.ParamCount > Info->ParamCount) 317 { 318 ACPI_ERROR ((AE_INFO, 319 "Insufficient arguments (%u) - %u are required", 320 Info->ParamCount, 321 Info->ObjDesc->Method.ParamCount)); 322 323 Status = AE_MISSING_ARGUMENTS; 324 goto Cleanup; 325 } 326 327 else if (Info->ObjDesc->Method.ParamCount < Info->ParamCount) 328 { 329 ACPI_WARNING ((AE_INFO, 330 "Excess arguments (%u) - only %u are required", 331 Info->ParamCount, 332 Info->ObjDesc->Method.ParamCount)); 333 334 /* Just pass the required number of arguments */ 335 336 Info->ParamCount = Info->ObjDesc->Method.ParamCount; 337 } 338 339 /* 340 * Any incoming external objects to be passed as arguments to the 341 * method must be converted to internal objects 342 */ 343 if (Info->ParamCount) 344 { 345 /* 346 * Allocate a new parameter block for the internal objects 347 * Add 1 to count to allow for null terminated internal list 348 */ 349 Info->Parameters = ACPI_ALLOCATE_ZEROED ( 350 ((ACPI_SIZE) Info->ParamCount + 1) * sizeof (void *)); 351 if (!Info->Parameters) 352 { 353 Status = AE_NO_MEMORY; 354 goto Cleanup; 355 } 356 357 /* Convert each external object in the list to an internal object */ 358 359 for (i = 0; i < Info->ParamCount; i++) 360 { 361 Status = AcpiUtCopyEobjectToIobject ( 362 &ExternalParams->Pointer[i], &Info->Parameters[i]); 363 if (ACPI_FAILURE (Status)) 364 { 365 goto Cleanup; 366 } 367 } 368 369 Info->Parameters[Info->ParamCount] = NULL; 370 } 371 break; 372 373 default: 374 375 /* Warn if arguments passed to an object that is not a method */ 376 377 if (Info->ParamCount) 378 { 379 ACPI_WARNING ((AE_INFO, 380 "%u arguments were passed to a non-method ACPI object", 381 Info->ParamCount)); 382 } 383 break; 384 } 385 386 #endif 387 388 389 /* Now we can evaluate the object */ 390 391 Status = AcpiNsEvaluate (Info); 392 393 /* 394 * If we are expecting a return value, and all went well above, 395 * copy the return value to an external object. 396 */ 397 if (ReturnBuffer) 398 { 399 if (!Info->ReturnObject) 400 { 401 ReturnBuffer->Length = 0; 402 } 403 else 404 { 405 if (ACPI_GET_DESCRIPTOR_TYPE (Info->ReturnObject) == 406 ACPI_DESC_TYPE_NAMED) 407 { 408 /* 409 * If we received a NS Node as a return object, this means that 410 * the object we are evaluating has nothing interesting to 411 * return (such as a mutex, etc.) We return an error because 412 * these types are essentially unsupported by this interface. 413 * We don't check up front because this makes it easier to add 414 * support for various types at a later date if necessary. 415 */ 416 Status = AE_TYPE; 417 Info->ReturnObject = NULL; /* No need to delete a NS Node */ 418 ReturnBuffer->Length = 0; 419 } 420 421 if (ACPI_SUCCESS (Status)) 422 { 423 /* Dereference Index and RefOf references */ 424 425 AcpiNsResolveReferences (Info); 426 427 /* Get the size of the returned object */ 428 429 Status = AcpiUtGetObjectSize (Info->ReturnObject, 430 &BufferSpaceNeeded); 431 if (ACPI_SUCCESS (Status)) 432 { 433 /* Validate/Allocate/Clear caller buffer */ 434 435 Status = AcpiUtInitializeBuffer (ReturnBuffer, 436 BufferSpaceNeeded); 437 if (ACPI_FAILURE (Status)) 438 { 439 /* 440 * Caller's buffer is too small or a new one can't 441 * be allocated 442 */ 443 ACPI_DEBUG_PRINT ((ACPI_DB_INFO, 444 "Needed buffer size %X, %s\n", 445 (UINT32) BufferSpaceNeeded, 446 AcpiFormatException (Status))); 447 } 448 else 449 { 450 /* We have enough space for the object, build it */ 451 452 Status = AcpiUtCopyIobjectToEobject (Info->ReturnObject, 453 ReturnBuffer); 454 } 455 } 456 } 457 } 458 } 459 460 if (Info->ReturnObject) 461 { 462 /* 463 * Delete the internal return object. NOTE: Interpreter must be 464 * locked to avoid race condition. 465 */ 466 AcpiExEnterInterpreter (); 467 468 /* Remove one reference on the return object (should delete it) */ 469 470 AcpiUtRemoveReference (Info->ReturnObject); 471 AcpiExExitInterpreter (); 472 } 473 474 475 Cleanup: 476 477 /* Free the input parameter list (if we created one) */ 478 479 if (Info->Parameters) 480 { 481 /* Free the allocated parameter block */ 482 483 AcpiUtDeleteInternalObjectList (Info->Parameters); 484 } 485 486 ACPI_FREE (Info); 487 return_ACPI_STATUS (Status); 488 } 489 490 ACPI_EXPORT_SYMBOL (AcpiEvaluateObject) 491 492 493 /******************************************************************************* 494 * 495 * FUNCTION: AcpiNsResolveReferences 496 * 497 * PARAMETERS: Info - Evaluation info block 498 * 499 * RETURN: Info->ReturnObject is replaced with the dereferenced object 500 * 501 * DESCRIPTION: Dereference certain reference objects. Called before an 502 * internal return object is converted to an external ACPI_OBJECT. 503 * 504 * Performs an automatic dereference of Index and RefOf reference objects. 505 * These reference objects are not supported by the ACPI_OBJECT, so this is a 506 * last resort effort to return something useful. Also, provides compatibility 507 * with other ACPI implementations. 508 * 509 * NOTE: does not handle references within returned package objects or nested 510 * references, but this support could be added later if found to be necessary. 511 * 512 ******************************************************************************/ 513 514 static void 515 AcpiNsResolveReferences ( 516 ACPI_EVALUATE_INFO *Info) 517 { 518 ACPI_OPERAND_OBJECT *ObjDesc = NULL; 519 ACPI_NAMESPACE_NODE *Node; 520 521 522 /* We are interested in reference objects only */ 523 524 if ((Info->ReturnObject)->Common.Type != ACPI_TYPE_LOCAL_REFERENCE) 525 { 526 return; 527 } 528 529 /* 530 * Two types of references are supported - those created by Index and 531 * RefOf operators. A name reference (AML_NAMEPATH_OP) can be converted 532 * to an ACPI_OBJECT, so it is not dereferenced here. A DdbHandle 533 * (AML_LOAD_OP) cannot be dereferenced, nor can it be converted to 534 * an ACPI_OBJECT. 535 */ 536 switch (Info->ReturnObject->Reference.Class) 537 { 538 case ACPI_REFCLASS_INDEX: 539 540 ObjDesc = *(Info->ReturnObject->Reference.Where); 541 break; 542 543 case ACPI_REFCLASS_REFOF: 544 545 Node = Info->ReturnObject->Reference.Object; 546 if (Node) 547 { 548 ObjDesc = Node->Object; 549 } 550 break; 551 552 default: 553 554 return; 555 } 556 557 /* Replace the existing reference object */ 558 559 if (ObjDesc) 560 { 561 AcpiUtAddReference (ObjDesc); 562 AcpiUtRemoveReference (Info->ReturnObject); 563 Info->ReturnObject = ObjDesc; 564 } 565 566 return; 567 } 568 569 570 /******************************************************************************* 571 * 572 * FUNCTION: AcpiWalkNamespace 573 * 574 * PARAMETERS: Type - ACPI_OBJECT_TYPE to search for 575 * StartObject - Handle in namespace where search begins 576 * MaxDepth - Depth to which search is to reach 577 * DescendingCallback - Called during tree descent 578 * when an object of "Type" is found 579 * AscendingCallback - Called during tree ascent 580 * when an object of "Type" is found 581 * Context - Passed to user function(s) above 582 * ReturnValue - Location where return value of 583 * UserFunction is put if terminated early 584 * 585 * RETURNS Return value from the UserFunction if terminated early. 586 * Otherwise, returns NULL. 587 * 588 * DESCRIPTION: Performs a modified depth-first walk of the namespace tree, 589 * starting (and ending) at the object specified by StartHandle. 590 * The callback function is called whenever an object that matches 591 * the type parameter is found. If the callback function returns 592 * a non-zero value, the search is terminated immediately and this 593 * value is returned to the caller. 594 * 595 * The point of this procedure is to provide a generic namespace 596 * walk routine that can be called from multiple places to 597 * provide multiple services; the callback function(s) can be 598 * tailored to each task, whether it is a print function, 599 * a compare function, etc. 600 * 601 ******************************************************************************/ 602 603 ACPI_STATUS 604 AcpiWalkNamespace ( 605 ACPI_OBJECT_TYPE Type, 606 ACPI_HANDLE StartObject, 607 UINT32 MaxDepth, 608 ACPI_WALK_CALLBACK DescendingCallback, 609 ACPI_WALK_CALLBACK AscendingCallback, 610 void *Context, 611 void **ReturnValue) 612 { 613 ACPI_STATUS Status; 614 615 616 ACPI_FUNCTION_TRACE (AcpiWalkNamespace); 617 618 619 /* Parameter validation */ 620 621 if ((Type > ACPI_TYPE_LOCAL_MAX) || 622 (!MaxDepth) || 623 (!DescendingCallback && !AscendingCallback)) 624 { 625 return_ACPI_STATUS (AE_BAD_PARAMETER); 626 } 627 628 /* 629 * Need to acquire the namespace reader lock to prevent interference 630 * with any concurrent table unloads (which causes the deletion of 631 * namespace objects). We cannot allow the deletion of a namespace node 632 * while the user function is using it. The exception to this are the 633 * nodes created and deleted during control method execution -- these 634 * nodes are marked as temporary nodes and are ignored by the namespace 635 * walk. Thus, control methods can be executed while holding the 636 * namespace deletion lock (and the user function can execute control 637 * methods.) 638 */ 639 Status = AcpiUtAcquireReadLock (&AcpiGbl_NamespaceRwLock); 640 if (ACPI_FAILURE (Status)) 641 { 642 return_ACPI_STATUS (Status); 643 } 644 645 /* 646 * Lock the namespace around the walk. The namespace will be 647 * unlocked/locked around each call to the user function - since the user 648 * function must be allowed to make ACPICA calls itself (for example, it 649 * will typically execute control methods during device enumeration.) 650 */ 651 Status = AcpiUtAcquireMutex (ACPI_MTX_NAMESPACE); 652 if (ACPI_FAILURE (Status)) 653 { 654 goto UnlockAndExit; 655 } 656 657 /* Now we can validate the starting node */ 658 659 if (!AcpiNsValidateHandle (StartObject)) 660 { 661 Status = AE_BAD_PARAMETER; 662 goto UnlockAndExit2; 663 } 664 665 Status = AcpiNsWalkNamespace (Type, StartObject, MaxDepth, 666 ACPI_NS_WALK_UNLOCK, DescendingCallback, 667 AscendingCallback, Context, ReturnValue); 668 669 UnlockAndExit2: 670 (void) AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE); 671 672 UnlockAndExit: 673 (void) AcpiUtReleaseReadLock (&AcpiGbl_NamespaceRwLock); 674 return_ACPI_STATUS (Status); 675 } 676 677 ACPI_EXPORT_SYMBOL (AcpiWalkNamespace) 678 679 680 /******************************************************************************* 681 * 682 * FUNCTION: AcpiNsGetDeviceCallback 683 * 684 * PARAMETERS: Callback from AcpiGetDevice 685 * 686 * RETURN: Status 687 * 688 * DESCRIPTION: Takes callbacks from WalkNamespace and filters out all non- 689 * present devices, or if they specified a HID, it filters based 690 * on that. 691 * 692 ******************************************************************************/ 693 694 static ACPI_STATUS 695 AcpiNsGetDeviceCallback ( 696 ACPI_HANDLE ObjHandle, 697 UINT32 NestingLevel, 698 void *Context, 699 void **ReturnValue) 700 { 701 ACPI_GET_DEVICES_INFO *Info = Context; 702 ACPI_STATUS Status; 703 ACPI_NAMESPACE_NODE *Node; 704 UINT32 Flags; 705 ACPI_PNP_DEVICE_ID *Hid; 706 ACPI_PNP_DEVICE_ID_LIST *Cid; 707 UINT32 i; 708 BOOLEAN Found; 709 int NoMatch; 710 711 712 Status = AcpiUtAcquireMutex (ACPI_MTX_NAMESPACE); 713 if (ACPI_FAILURE (Status)) 714 { 715 return (Status); 716 } 717 718 Node = AcpiNsValidateHandle (ObjHandle); 719 Status = AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE); 720 if (ACPI_FAILURE (Status)) 721 { 722 return (Status); 723 } 724 725 if (!Node) 726 { 727 return (AE_BAD_PARAMETER); 728 } 729 730 /* 731 * First, filter based on the device HID and CID. 732 * 733 * 01/2010: For this case where a specific HID is requested, we don't 734 * want to run _STA until we have an actual HID match. Thus, we will 735 * not unnecessarily execute _STA on devices for which the caller 736 * doesn't care about. Previously, _STA was executed unconditionally 737 * on all devices found here. 738 * 739 * A side-effect of this change is that now we will continue to search 740 * for a matching HID even under device trees where the parent device 741 * would have returned a _STA that indicates it is not present or 742 * not functioning (thus aborting the search on that branch). 743 */ 744 if (Info->Hid != NULL) 745 { 746 Status = AcpiUtExecute_HID (Node, &Hid); 747 if (Status == AE_NOT_FOUND) 748 { 749 return (AE_OK); 750 } 751 else if (ACPI_FAILURE (Status)) 752 { 753 return (AE_CTRL_DEPTH); 754 } 755 756 NoMatch = ACPI_STRCMP (Hid->String, Info->Hid); 757 ACPI_FREE (Hid); 758 759 if (NoMatch) 760 { 761 /* 762 * HID does not match, attempt match within the 763 * list of Compatible IDs (CIDs) 764 */ 765 Status = AcpiUtExecute_CID (Node, &Cid); 766 if (Status == AE_NOT_FOUND) 767 { 768 return (AE_OK); 769 } 770 else if (ACPI_FAILURE (Status)) 771 { 772 return (AE_CTRL_DEPTH); 773 } 774 775 /* Walk the CID list */ 776 777 Found = FALSE; 778 for (i = 0; i < Cid->Count; i++) 779 { 780 if (ACPI_STRCMP (Cid->Ids[i].String, Info->Hid) == 0) 781 { 782 /* Found a matching CID */ 783 784 Found = TRUE; 785 break; 786 } 787 } 788 789 ACPI_FREE (Cid); 790 if (!Found) 791 { 792 return (AE_OK); 793 } 794 } 795 } 796 797 /* Run _STA to determine if device is present */ 798 799 Status = AcpiUtExecute_STA (Node, &Flags); 800 if (ACPI_FAILURE (Status)) 801 { 802 return (AE_CTRL_DEPTH); 803 } 804 805 if (!(Flags & ACPI_STA_DEVICE_PRESENT) && 806 !(Flags & ACPI_STA_DEVICE_FUNCTIONING)) 807 { 808 /* 809 * Don't examine the children of the device only when the 810 * device is neither present nor functional. See ACPI spec, 811 * description of _STA for more information. 812 */ 813 return (AE_CTRL_DEPTH); 814 } 815 816 /* We have a valid device, invoke the user function */ 817 818 Status = Info->UserFunction (ObjHandle, NestingLevel, Info->Context, 819 ReturnValue); 820 return (Status); 821 } 822 823 824 /******************************************************************************* 825 * 826 * FUNCTION: AcpiGetDevices 827 * 828 * PARAMETERS: HID - HID to search for. Can be NULL. 829 * UserFunction - Called when a matching object is found 830 * Context - Passed to user function 831 * ReturnValue - Location where return value of 832 * UserFunction is put if terminated early 833 * 834 * RETURNS Return value from the UserFunction if terminated early. 835 * Otherwise, returns NULL. 836 * 837 * DESCRIPTION: Performs a modified depth-first walk of the namespace tree, 838 * starting (and ending) at the object specified by StartHandle. 839 * The UserFunction is called whenever an object of type 840 * Device is found. If the user function returns 841 * a non-zero value, the search is terminated immediately and this 842 * value is returned to the caller. 843 * 844 * This is a wrapper for WalkNamespace, but the callback performs 845 * additional filtering. Please see AcpiNsGetDeviceCallback. 846 * 847 ******************************************************************************/ 848 849 ACPI_STATUS 850 AcpiGetDevices ( 851 char *HID, 852 ACPI_WALK_CALLBACK UserFunction, 853 void *Context, 854 void **ReturnValue) 855 { 856 ACPI_STATUS Status; 857 ACPI_GET_DEVICES_INFO Info; 858 859 860 ACPI_FUNCTION_TRACE (AcpiGetDevices); 861 862 863 /* Parameter validation */ 864 865 if (!UserFunction) 866 { 867 return_ACPI_STATUS (AE_BAD_PARAMETER); 868 } 869 870 /* 871 * We're going to call their callback from OUR callback, so we need 872 * to know what it is, and their context parameter. 873 */ 874 Info.Hid = HID; 875 Info.Context = Context; 876 Info.UserFunction = UserFunction; 877 878 /* 879 * Lock the namespace around the walk. 880 * The namespace will be unlocked/locked around each call 881 * to the user function - since this function 882 * must be allowed to make Acpi calls itself. 883 */ 884 Status = AcpiUtAcquireMutex (ACPI_MTX_NAMESPACE); 885 if (ACPI_FAILURE (Status)) 886 { 887 return_ACPI_STATUS (Status); 888 } 889 890 Status = AcpiNsWalkNamespace (ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, 891 ACPI_UINT32_MAX, ACPI_NS_WALK_UNLOCK, 892 AcpiNsGetDeviceCallback, NULL, &Info, ReturnValue); 893 894 (void) AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE); 895 return_ACPI_STATUS (Status); 896 } 897 898 ACPI_EXPORT_SYMBOL (AcpiGetDevices) 899 900 901 /******************************************************************************* 902 * 903 * FUNCTION: AcpiAttachData 904 * 905 * PARAMETERS: ObjHandle - Namespace node 906 * Handler - Handler for this attachment 907 * Data - Pointer to data to be attached 908 * 909 * RETURN: Status 910 * 911 * DESCRIPTION: Attach arbitrary data and handler to a namespace node. 912 * 913 ******************************************************************************/ 914 915 ACPI_STATUS 916 AcpiAttachData ( 917 ACPI_HANDLE ObjHandle, 918 ACPI_OBJECT_HANDLER Handler, 919 void *Data) 920 { 921 ACPI_NAMESPACE_NODE *Node; 922 ACPI_STATUS Status; 923 924 925 /* Parameter validation */ 926 927 if (!ObjHandle || 928 !Handler || 929 !Data) 930 { 931 return (AE_BAD_PARAMETER); 932 } 933 934 Status = AcpiUtAcquireMutex (ACPI_MTX_NAMESPACE); 935 if (ACPI_FAILURE (Status)) 936 { 937 return (Status); 938 } 939 940 /* Convert and validate the handle */ 941 942 Node = AcpiNsValidateHandle (ObjHandle); 943 if (!Node) 944 { 945 Status = AE_BAD_PARAMETER; 946 goto UnlockAndExit; 947 } 948 949 Status = AcpiNsAttachData (Node, Handler, Data); 950 951 UnlockAndExit: 952 (void) AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE); 953 return (Status); 954 } 955 956 ACPI_EXPORT_SYMBOL (AcpiAttachData) 957 958 959 /******************************************************************************* 960 * 961 * FUNCTION: AcpiDetachData 962 * 963 * PARAMETERS: ObjHandle - Namespace node handle 964 * Handler - Handler used in call to AcpiAttachData 965 * 966 * RETURN: Status 967 * 968 * DESCRIPTION: Remove data that was previously attached to a node. 969 * 970 ******************************************************************************/ 971 972 ACPI_STATUS 973 AcpiDetachData ( 974 ACPI_HANDLE ObjHandle, 975 ACPI_OBJECT_HANDLER Handler) 976 { 977 ACPI_NAMESPACE_NODE *Node; 978 ACPI_STATUS Status; 979 980 981 /* Parameter validation */ 982 983 if (!ObjHandle || 984 !Handler) 985 { 986 return (AE_BAD_PARAMETER); 987 } 988 989 Status = AcpiUtAcquireMutex (ACPI_MTX_NAMESPACE); 990 if (ACPI_FAILURE (Status)) 991 { 992 return (Status); 993 } 994 995 /* Convert and validate the handle */ 996 997 Node = AcpiNsValidateHandle (ObjHandle); 998 if (!Node) 999 { 1000 Status = AE_BAD_PARAMETER; 1001 goto UnlockAndExit; 1002 } 1003 1004 Status = AcpiNsDetachData (Node, Handler); 1005 1006 UnlockAndExit: 1007 (void) AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE); 1008 return (Status); 1009 } 1010 1011 ACPI_EXPORT_SYMBOL (AcpiDetachData) 1012 1013 1014 /******************************************************************************* 1015 * 1016 * FUNCTION: AcpiGetData 1017 * 1018 * PARAMETERS: ObjHandle - Namespace node 1019 * Handler - Handler used in call to AttachData 1020 * Data - Where the data is returned 1021 * 1022 * RETURN: Status 1023 * 1024 * DESCRIPTION: Retrieve data that was previously attached to a namespace node. 1025 * 1026 ******************************************************************************/ 1027 1028 ACPI_STATUS 1029 AcpiGetData ( 1030 ACPI_HANDLE ObjHandle, 1031 ACPI_OBJECT_HANDLER Handler, 1032 void **Data) 1033 { 1034 ACPI_NAMESPACE_NODE *Node; 1035 ACPI_STATUS Status; 1036 1037 1038 /* Parameter validation */ 1039 1040 if (!ObjHandle || 1041 !Handler || 1042 !Data) 1043 { 1044 return (AE_BAD_PARAMETER); 1045 } 1046 1047 Status = AcpiUtAcquireMutex (ACPI_MTX_NAMESPACE); 1048 if (ACPI_FAILURE (Status)) 1049 { 1050 return (Status); 1051 } 1052 1053 /* Convert and validate the handle */ 1054 1055 Node = AcpiNsValidateHandle (ObjHandle); 1056 if (!Node) 1057 { 1058 Status = AE_BAD_PARAMETER; 1059 goto UnlockAndExit; 1060 } 1061 1062 Status = AcpiNsGetAttachedData (Node, Handler, Data); 1063 1064 UnlockAndExit: 1065 (void) AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE); 1066 return (Status); 1067 } 1068 1069 ACPI_EXPORT_SYMBOL (AcpiGetData) 1070