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 - 2015, 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 #define EXPORT_ACPI_INTERFACES 46 47 #include <contrib/dev/acpica/include/acpi.h> 48 #include <contrib/dev/acpica/include/accommon.h> 49 #include <contrib/dev/acpica/include/acnamesp.h> 50 #include <contrib/dev/acpica/include/acinterp.h> 51 52 53 #define _COMPONENT ACPI_NAMESPACE 54 ACPI_MODULE_NAME ("nsxfeval") 55 56 /* Local prototypes */ 57 58 static void 59 AcpiNsResolveReferences ( 60 ACPI_EVALUATE_INFO *Info); 61 62 63 /******************************************************************************* 64 * 65 * FUNCTION: AcpiEvaluateObjectTyped 66 * 67 * PARAMETERS: Handle - Object handle (optional) 68 * Pathname - Object pathname (optional) 69 * ExternalParams - List of parameters to pass to method, 70 * terminated by NULL. May be NULL 71 * if no parameters are being passed. 72 * ReturnBuffer - Where to put method's return value (if 73 * any). If NULL, no value is returned. 74 * ReturnType - Expected type of return object 75 * 76 * RETURN: Status 77 * 78 * DESCRIPTION: Find and evaluate the given object, passing the given 79 * parameters if necessary. One of "Handle" or "Pathname" must 80 * be valid (non-null) 81 * 82 ******************************************************************************/ 83 84 ACPI_STATUS 85 AcpiEvaluateObjectTyped ( 86 ACPI_HANDLE Handle, 87 ACPI_STRING Pathname, 88 ACPI_OBJECT_LIST *ExternalParams, 89 ACPI_BUFFER *ReturnBuffer, 90 ACPI_OBJECT_TYPE ReturnType) 91 { 92 ACPI_STATUS Status; 93 BOOLEAN FreeBufferOnError = FALSE; 94 95 96 ACPI_FUNCTION_TRACE (AcpiEvaluateObjectTyped); 97 98 99 /* Return buffer must be valid */ 100 101 if (!ReturnBuffer) 102 { 103 return_ACPI_STATUS (AE_BAD_PARAMETER); 104 } 105 106 if (ReturnBuffer->Length == ACPI_ALLOCATE_BUFFER) 107 { 108 FreeBufferOnError = TRUE; 109 } 110 111 /* Evaluate the object */ 112 113 Status = AcpiEvaluateObject (Handle, Pathname, 114 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 (FreeBufferOnError) 150 { 151 /* 152 * Free a buffer created via ACPI_ALLOCATE_BUFFER. 153 * Note: We use AcpiOsFree here because AcpiOsAllocate was used 154 * to allocate the buffer. This purposefully bypasses the 155 * (optionally enabled) allocation tracking mechanism since we 156 * only want to track internal allocations. 157 */ 158 AcpiOsFree (ReturnBuffer->Pointer); 159 ReturnBuffer->Pointer = NULL; 160 } 161 162 ReturnBuffer->Length = 0; 163 return_ACPI_STATUS (AE_TYPE); 164 } 165 166 ACPI_EXPORT_SYMBOL (AcpiEvaluateObjectTyped) 167 168 169 /******************************************************************************* 170 * 171 * FUNCTION: AcpiEvaluateObject 172 * 173 * PARAMETERS: Handle - Object handle (optional) 174 * Pathname - Object pathname (optional) 175 * ExternalParams - List of parameters to pass to method, 176 * terminated by NULL. May be NULL 177 * if no parameters are being passed. 178 * ReturnBuffer - Where to put method's return value (if 179 * any). If NULL, no value is returned. 180 * 181 * RETURN: Status 182 * 183 * DESCRIPTION: Find and evaluate the given object, passing the given 184 * parameters if necessary. One of "Handle" or "Pathname" must 185 * be valid (non-null) 186 * 187 ******************************************************************************/ 188 189 ACPI_STATUS 190 AcpiEvaluateObject ( 191 ACPI_HANDLE Handle, 192 ACPI_STRING Pathname, 193 ACPI_OBJECT_LIST *ExternalParams, 194 ACPI_BUFFER *ReturnBuffer) 195 { 196 ACPI_STATUS Status; 197 ACPI_EVALUATE_INFO *Info; 198 ACPI_SIZE BufferSpaceNeeded; 199 UINT32 i; 200 201 202 ACPI_FUNCTION_TRACE (AcpiEvaluateObject); 203 204 205 /* Allocate and initialize the evaluation information block */ 206 207 Info = ACPI_ALLOCATE_ZEROED (sizeof (ACPI_EVALUATE_INFO)); 208 if (!Info) 209 { 210 return_ACPI_STATUS (AE_NO_MEMORY); 211 } 212 213 /* Convert and validate the device handle */ 214 215 Info->PrefixNode = AcpiNsValidateHandle (Handle); 216 if (!Info->PrefixNode) 217 { 218 Status = AE_BAD_PARAMETER; 219 goto Cleanup; 220 } 221 222 /* 223 * Get the actual namespace node for the target object. 224 * Handles these cases: 225 * 226 * 1) Null node, valid pathname from root (absolute path) 227 * 2) Node and valid pathname (path relative to Node) 228 * 3) Node, Null pathname 229 */ 230 if ((Pathname) && 231 (ACPI_IS_ROOT_PREFIX (Pathname[0]))) 232 { 233 /* The path is fully qualified, just evaluate by name */ 234 235 Info->PrefixNode = NULL; 236 } 237 else if (!Handle) 238 { 239 /* 240 * A handle is optional iff a fully qualified pathname is specified. 241 * Since we've already handled fully qualified names above, this is 242 * an error. 243 */ 244 if (!Pathname) 245 { 246 ACPI_DEBUG_PRINT ((ACPI_DB_INFO, 247 "Both Handle and Pathname are NULL")); 248 } 249 else 250 { 251 ACPI_DEBUG_PRINT ((ACPI_DB_INFO, 252 "Null Handle with relative pathname [%s]", Pathname)); 253 } 254 255 Status = AE_BAD_PARAMETER; 256 goto Cleanup; 257 } 258 259 Info->RelativePathname = Pathname; 260 261 /* 262 * Convert all external objects passed as arguments to the 263 * internal version(s). 264 */ 265 if (ExternalParams && ExternalParams->Count) 266 { 267 Info->ParamCount = (UINT16) ExternalParams->Count; 268 269 /* Warn on impossible argument count */ 270 271 if (Info->ParamCount > ACPI_METHOD_NUM_ARGS) 272 { 273 ACPI_WARN_PREDEFINED ((AE_INFO, Pathname, ACPI_WARN_ALWAYS, 274 "Excess arguments (%u) - using only %u", 275 Info->ParamCount, ACPI_METHOD_NUM_ARGS)); 276 277 Info->ParamCount = ACPI_METHOD_NUM_ARGS; 278 } 279 280 /* 281 * Allocate a new parameter block for the internal objects 282 * Add 1 to count to allow for null terminated internal list 283 */ 284 Info->Parameters = ACPI_ALLOCATE_ZEROED ( 285 ((ACPI_SIZE) Info->ParamCount + 1) * sizeof (void *)); 286 if (!Info->Parameters) 287 { 288 Status = AE_NO_MEMORY; 289 goto Cleanup; 290 } 291 292 /* Convert each external object in the list to an internal object */ 293 294 for (i = 0; i < Info->ParamCount; i++) 295 { 296 Status = AcpiUtCopyEobjectToIobject ( 297 &ExternalParams->Pointer[i], &Info->Parameters[i]); 298 if (ACPI_FAILURE (Status)) 299 { 300 goto Cleanup; 301 } 302 } 303 304 Info->Parameters[Info->ParamCount] = NULL; 305 } 306 307 308 #if 0 309 310 /* 311 * Begin incoming argument count analysis. Check for too few args 312 * and too many args. 313 */ 314 315 switch (AcpiNsGetType (Info->Node)) 316 { 317 case ACPI_TYPE_METHOD: 318 319 /* Check incoming argument count against the method definition */ 320 321 if (Info->ObjDesc->Method.ParamCount > Info->ParamCount) 322 { 323 ACPI_ERROR ((AE_INFO, 324 "Insufficient arguments (%u) - %u are required", 325 Info->ParamCount, 326 Info->ObjDesc->Method.ParamCount)); 327 328 Status = AE_MISSING_ARGUMENTS; 329 goto Cleanup; 330 } 331 332 else if (Info->ObjDesc->Method.ParamCount < Info->ParamCount) 333 { 334 ACPI_WARNING ((AE_INFO, 335 "Excess arguments (%u) - only %u are required", 336 Info->ParamCount, 337 Info->ObjDesc->Method.ParamCount)); 338 339 /* Just pass the required number of arguments */ 340 341 Info->ParamCount = Info->ObjDesc->Method.ParamCount; 342 } 343 344 /* 345 * Any incoming external objects to be passed as arguments to the 346 * method must be converted to internal objects 347 */ 348 if (Info->ParamCount) 349 { 350 /* 351 * Allocate a new parameter block for the internal objects 352 * Add 1 to count to allow for null terminated internal list 353 */ 354 Info->Parameters = ACPI_ALLOCATE_ZEROED ( 355 ((ACPI_SIZE) Info->ParamCount + 1) * sizeof (void *)); 356 if (!Info->Parameters) 357 { 358 Status = AE_NO_MEMORY; 359 goto Cleanup; 360 } 361 362 /* Convert each external object in the list to an internal object */ 363 364 for (i = 0; i < Info->ParamCount; i++) 365 { 366 Status = AcpiUtCopyEobjectToIobject ( 367 &ExternalParams->Pointer[i], &Info->Parameters[i]); 368 if (ACPI_FAILURE (Status)) 369 { 370 goto Cleanup; 371 } 372 } 373 374 Info->Parameters[Info->ParamCount] = NULL; 375 } 376 break; 377 378 default: 379 380 /* Warn if arguments passed to an object that is not a method */ 381 382 if (Info->ParamCount) 383 { 384 ACPI_WARNING ((AE_INFO, 385 "%u arguments were passed to a non-method ACPI object", 386 Info->ParamCount)); 387 } 388 break; 389 } 390 391 #endif 392 393 394 /* Now we can evaluate the object */ 395 396 Status = AcpiNsEvaluate (Info); 397 398 /* 399 * If we are expecting a return value, and all went well above, 400 * copy the return value to an external object. 401 */ 402 if (ReturnBuffer) 403 { 404 if (!Info->ReturnObject) 405 { 406 ReturnBuffer->Length = 0; 407 } 408 else 409 { 410 if (ACPI_GET_DESCRIPTOR_TYPE (Info->ReturnObject) == 411 ACPI_DESC_TYPE_NAMED) 412 { 413 /* 414 * If we received a NS Node as a return object, this means that 415 * the object we are evaluating has nothing interesting to 416 * return (such as a mutex, etc.) We return an error because 417 * these types are essentially unsupported by this interface. 418 * We don't check up front because this makes it easier to add 419 * support for various types at a later date if necessary. 420 */ 421 Status = AE_TYPE; 422 Info->ReturnObject = NULL; /* No need to delete a NS Node */ 423 ReturnBuffer->Length = 0; 424 } 425 426 if (ACPI_SUCCESS (Status)) 427 { 428 /* Dereference Index and RefOf references */ 429 430 AcpiNsResolveReferences (Info); 431 432 /* Get the size of the returned object */ 433 434 Status = AcpiUtGetObjectSize (Info->ReturnObject, 435 &BufferSpaceNeeded); 436 if (ACPI_SUCCESS (Status)) 437 { 438 /* Validate/Allocate/Clear caller buffer */ 439 440 Status = AcpiUtInitializeBuffer (ReturnBuffer, 441 BufferSpaceNeeded); 442 if (ACPI_FAILURE (Status)) 443 { 444 /* 445 * Caller's buffer is too small or a new one can't 446 * be allocated 447 */ 448 ACPI_DEBUG_PRINT ((ACPI_DB_INFO, 449 "Needed buffer size %X, %s\n", 450 (UINT32) BufferSpaceNeeded, 451 AcpiFormatException (Status))); 452 } 453 else 454 { 455 /* We have enough space for the object, build it */ 456 457 Status = AcpiUtCopyIobjectToEobject (Info->ReturnObject, 458 ReturnBuffer); 459 } 460 } 461 } 462 } 463 } 464 465 if (Info->ReturnObject) 466 { 467 /* 468 * Delete the internal return object. NOTE: Interpreter must be 469 * locked to avoid race condition. 470 */ 471 AcpiExEnterInterpreter (); 472 473 /* Remove one reference on the return object (should delete it) */ 474 475 AcpiUtRemoveReference (Info->ReturnObject); 476 AcpiExExitInterpreter (); 477 } 478 479 480 Cleanup: 481 482 /* Free the input parameter list (if we created one) */ 483 484 if (Info->Parameters) 485 { 486 /* Free the allocated parameter block */ 487 488 AcpiUtDeleteInternalObjectList (Info->Parameters); 489 } 490 491 ACPI_FREE (Info); 492 return_ACPI_STATUS (Status); 493 } 494 495 ACPI_EXPORT_SYMBOL (AcpiEvaluateObject) 496 497 498 /******************************************************************************* 499 * 500 * FUNCTION: AcpiNsResolveReferences 501 * 502 * PARAMETERS: Info - Evaluation info block 503 * 504 * RETURN: Info->ReturnObject is replaced with the dereferenced object 505 * 506 * DESCRIPTION: Dereference certain reference objects. Called before an 507 * internal return object is converted to an external ACPI_OBJECT. 508 * 509 * Performs an automatic dereference of Index and RefOf reference objects. 510 * These reference objects are not supported by the ACPI_OBJECT, so this is a 511 * last resort effort to return something useful. Also, provides compatibility 512 * with other ACPI implementations. 513 * 514 * NOTE: does not handle references within returned package objects or nested 515 * references, but this support could be added later if found to be necessary. 516 * 517 ******************************************************************************/ 518 519 static void 520 AcpiNsResolveReferences ( 521 ACPI_EVALUATE_INFO *Info) 522 { 523 ACPI_OPERAND_OBJECT *ObjDesc = NULL; 524 ACPI_NAMESPACE_NODE *Node; 525 526 527 /* We are interested in reference objects only */ 528 529 if ((Info->ReturnObject)->Common.Type != ACPI_TYPE_LOCAL_REFERENCE) 530 { 531 return; 532 } 533 534 /* 535 * Two types of references are supported - those created by Index and 536 * RefOf operators. A name reference (AML_NAMEPATH_OP) can be converted 537 * to an ACPI_OBJECT, so it is not dereferenced here. A DdbHandle 538 * (AML_LOAD_OP) cannot be dereferenced, nor can it be converted to 539 * an ACPI_OBJECT. 540 */ 541 switch (Info->ReturnObject->Reference.Class) 542 { 543 case ACPI_REFCLASS_INDEX: 544 545 ObjDesc = *(Info->ReturnObject->Reference.Where); 546 break; 547 548 case ACPI_REFCLASS_REFOF: 549 550 Node = Info->ReturnObject->Reference.Object; 551 if (Node) 552 { 553 ObjDesc = Node->Object; 554 } 555 break; 556 557 default: 558 559 return; 560 } 561 562 /* Replace the existing reference object */ 563 564 if (ObjDesc) 565 { 566 AcpiUtAddReference (ObjDesc); 567 AcpiUtRemoveReference (Info->ReturnObject); 568 Info->ReturnObject = ObjDesc; 569 } 570 571 return; 572 } 573 574 575 /******************************************************************************* 576 * 577 * FUNCTION: AcpiWalkNamespace 578 * 579 * PARAMETERS: Type - ACPI_OBJECT_TYPE to search for 580 * StartObject - Handle in namespace where search begins 581 * MaxDepth - Depth to which search is to reach 582 * DescendingCallback - Called during tree descent 583 * when an object of "Type" is found 584 * AscendingCallback - Called during tree ascent 585 * when an object of "Type" is found 586 * Context - Passed to user function(s) above 587 * ReturnValue - Location where return value of 588 * UserFunction is put if terminated early 589 * 590 * RETURNS Return value from the UserFunction if terminated early. 591 * Otherwise, returns NULL. 592 * 593 * DESCRIPTION: Performs a modified depth-first walk of the namespace tree, 594 * starting (and ending) at the object specified by StartHandle. 595 * The callback function is called whenever an object that matches 596 * the type parameter is found. If the callback function returns 597 * a non-zero value, the search is terminated immediately and this 598 * value is returned to the caller. 599 * 600 * The point of this procedure is to provide a generic namespace 601 * walk routine that can be called from multiple places to 602 * provide multiple services; the callback function(s) can be 603 * tailored to each task, whether it is a print function, 604 * a compare function, etc. 605 * 606 ******************************************************************************/ 607 608 ACPI_STATUS 609 AcpiWalkNamespace ( 610 ACPI_OBJECT_TYPE Type, 611 ACPI_HANDLE StartObject, 612 UINT32 MaxDepth, 613 ACPI_WALK_CALLBACK DescendingCallback, 614 ACPI_WALK_CALLBACK AscendingCallback, 615 void *Context, 616 void **ReturnValue) 617 { 618 ACPI_STATUS Status; 619 620 621 ACPI_FUNCTION_TRACE (AcpiWalkNamespace); 622 623 624 /* Parameter validation */ 625 626 if ((Type > ACPI_TYPE_LOCAL_MAX) || 627 (!MaxDepth) || 628 (!DescendingCallback && !AscendingCallback)) 629 { 630 return_ACPI_STATUS (AE_BAD_PARAMETER); 631 } 632 633 /* 634 * Need to acquire the namespace reader lock to prevent interference 635 * with any concurrent table unloads (which causes the deletion of 636 * namespace objects). We cannot allow the deletion of a namespace node 637 * while the user function is using it. The exception to this are the 638 * nodes created and deleted during control method execution -- these 639 * nodes are marked as temporary nodes and are ignored by the namespace 640 * walk. Thus, control methods can be executed while holding the 641 * namespace deletion lock (and the user function can execute control 642 * methods.) 643 */ 644 Status = AcpiUtAcquireReadLock (&AcpiGbl_NamespaceRwLock); 645 if (ACPI_FAILURE (Status)) 646 { 647 return_ACPI_STATUS (Status); 648 } 649 650 /* 651 * Lock the namespace around the walk. The namespace will be 652 * unlocked/locked around each call to the user function - since the user 653 * function must be allowed to make ACPICA calls itself (for example, it 654 * will typically execute control methods during device enumeration.) 655 */ 656 Status = AcpiUtAcquireMutex (ACPI_MTX_NAMESPACE); 657 if (ACPI_FAILURE (Status)) 658 { 659 goto UnlockAndExit; 660 } 661 662 /* Now we can validate the starting node */ 663 664 if (!AcpiNsValidateHandle (StartObject)) 665 { 666 Status = AE_BAD_PARAMETER; 667 goto UnlockAndExit2; 668 } 669 670 Status = AcpiNsWalkNamespace (Type, StartObject, MaxDepth, 671 ACPI_NS_WALK_UNLOCK, DescendingCallback, 672 AscendingCallback, Context, ReturnValue); 673 674 UnlockAndExit2: 675 (void) AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE); 676 677 UnlockAndExit: 678 (void) AcpiUtReleaseReadLock (&AcpiGbl_NamespaceRwLock); 679 return_ACPI_STATUS (Status); 680 } 681 682 ACPI_EXPORT_SYMBOL (AcpiWalkNamespace) 683 684 685 /******************************************************************************* 686 * 687 * FUNCTION: AcpiNsGetDeviceCallback 688 * 689 * PARAMETERS: Callback from AcpiGetDevice 690 * 691 * RETURN: Status 692 * 693 * DESCRIPTION: Takes callbacks from WalkNamespace and filters out all non- 694 * present devices, or if they specified a HID, it filters based 695 * on that. 696 * 697 ******************************************************************************/ 698 699 static ACPI_STATUS 700 AcpiNsGetDeviceCallback ( 701 ACPI_HANDLE ObjHandle, 702 UINT32 NestingLevel, 703 void *Context, 704 void **ReturnValue) 705 { 706 ACPI_GET_DEVICES_INFO *Info = Context; 707 ACPI_STATUS Status; 708 ACPI_NAMESPACE_NODE *Node; 709 UINT32 Flags; 710 ACPI_PNP_DEVICE_ID *Hid; 711 ACPI_PNP_DEVICE_ID_LIST *Cid; 712 UINT32 i; 713 BOOLEAN Found; 714 int NoMatch; 715 716 717 Status = AcpiUtAcquireMutex (ACPI_MTX_NAMESPACE); 718 if (ACPI_FAILURE (Status)) 719 { 720 return (Status); 721 } 722 723 Node = AcpiNsValidateHandle (ObjHandle); 724 Status = AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE); 725 if (ACPI_FAILURE (Status)) 726 { 727 return (Status); 728 } 729 730 if (!Node) 731 { 732 return (AE_BAD_PARAMETER); 733 } 734 735 /* 736 * First, filter based on the device HID and CID. 737 * 738 * 01/2010: For this case where a specific HID is requested, we don't 739 * want to run _STA until we have an actual HID match. Thus, we will 740 * not unnecessarily execute _STA on devices for which the caller 741 * doesn't care about. Previously, _STA was executed unconditionally 742 * on all devices found here. 743 * 744 * A side-effect of this change is that now we will continue to search 745 * for a matching HID even under device trees where the parent device 746 * would have returned a _STA that indicates it is not present or 747 * not functioning (thus aborting the search on that branch). 748 */ 749 if (Info->Hid != NULL) 750 { 751 Status = AcpiUtExecute_HID (Node, &Hid); 752 if (Status == AE_NOT_FOUND) 753 { 754 return (AE_OK); 755 } 756 else if (ACPI_FAILURE (Status)) 757 { 758 return (AE_CTRL_DEPTH); 759 } 760 761 NoMatch = strcmp (Hid->String, Info->Hid); 762 ACPI_FREE (Hid); 763 764 if (NoMatch) 765 { 766 /* 767 * HID does not match, attempt match within the 768 * list of Compatible IDs (CIDs) 769 */ 770 Status = AcpiUtExecute_CID (Node, &Cid); 771 if (Status == AE_NOT_FOUND) 772 { 773 return (AE_OK); 774 } 775 else if (ACPI_FAILURE (Status)) 776 { 777 return (AE_CTRL_DEPTH); 778 } 779 780 /* Walk the CID list */ 781 782 Found = FALSE; 783 for (i = 0; i < Cid->Count; i++) 784 { 785 if (strcmp (Cid->Ids[i].String, Info->Hid) == 0) 786 { 787 /* Found a matching CID */ 788 789 Found = TRUE; 790 break; 791 } 792 } 793 794 ACPI_FREE (Cid); 795 if (!Found) 796 { 797 return (AE_OK); 798 } 799 } 800 } 801 802 /* Run _STA to determine if device is present */ 803 804 Status = AcpiUtExecute_STA (Node, &Flags); 805 if (ACPI_FAILURE (Status)) 806 { 807 return (AE_CTRL_DEPTH); 808 } 809 810 if (!(Flags & ACPI_STA_DEVICE_PRESENT) && 811 !(Flags & ACPI_STA_DEVICE_FUNCTIONING)) 812 { 813 /* 814 * Don't examine the children of the device only when the 815 * device is neither present nor functional. See ACPI spec, 816 * description of _STA for more information. 817 */ 818 return (AE_CTRL_DEPTH); 819 } 820 821 /* We have a valid device, invoke the user function */ 822 823 Status = Info->UserFunction (ObjHandle, NestingLevel, Info->Context, 824 ReturnValue); 825 return (Status); 826 } 827 828 829 /******************************************************************************* 830 * 831 * FUNCTION: AcpiGetDevices 832 * 833 * PARAMETERS: HID - HID to search for. Can be NULL. 834 * UserFunction - Called when a matching object is found 835 * Context - Passed to user function 836 * ReturnValue - Location where return value of 837 * UserFunction is put if terminated early 838 * 839 * RETURNS Return value from the UserFunction if terminated early. 840 * Otherwise, returns NULL. 841 * 842 * DESCRIPTION: Performs a modified depth-first walk of the namespace tree, 843 * starting (and ending) at the object specified by StartHandle. 844 * The UserFunction is called whenever an object of type 845 * Device is found. If the user function returns 846 * a non-zero value, the search is terminated immediately and this 847 * value is returned to the caller. 848 * 849 * This is a wrapper for WalkNamespace, but the callback performs 850 * additional filtering. Please see AcpiNsGetDeviceCallback. 851 * 852 ******************************************************************************/ 853 854 ACPI_STATUS 855 AcpiGetDevices ( 856 char *HID, 857 ACPI_WALK_CALLBACK UserFunction, 858 void *Context, 859 void **ReturnValue) 860 { 861 ACPI_STATUS Status; 862 ACPI_GET_DEVICES_INFO Info; 863 864 865 ACPI_FUNCTION_TRACE (AcpiGetDevices); 866 867 868 /* Parameter validation */ 869 870 if (!UserFunction) 871 { 872 return_ACPI_STATUS (AE_BAD_PARAMETER); 873 } 874 875 /* 876 * We're going to call their callback from OUR callback, so we need 877 * to know what it is, and their context parameter. 878 */ 879 Info.Hid = HID; 880 Info.Context = Context; 881 Info.UserFunction = UserFunction; 882 883 /* 884 * Lock the namespace around the walk. 885 * The namespace will be unlocked/locked around each call 886 * to the user function - since this function 887 * must be allowed to make Acpi calls itself. 888 */ 889 Status = AcpiUtAcquireMutex (ACPI_MTX_NAMESPACE); 890 if (ACPI_FAILURE (Status)) 891 { 892 return_ACPI_STATUS (Status); 893 } 894 895 Status = AcpiNsWalkNamespace (ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, 896 ACPI_UINT32_MAX, ACPI_NS_WALK_UNLOCK, 897 AcpiNsGetDeviceCallback, NULL, &Info, ReturnValue); 898 899 (void) AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE); 900 return_ACPI_STATUS (Status); 901 } 902 903 ACPI_EXPORT_SYMBOL (AcpiGetDevices) 904 905 906 /******************************************************************************* 907 * 908 * FUNCTION: AcpiAttachData 909 * 910 * PARAMETERS: ObjHandle - Namespace node 911 * Handler - Handler for this attachment 912 * Data - Pointer to data to be attached 913 * 914 * RETURN: Status 915 * 916 * DESCRIPTION: Attach arbitrary data and handler to a namespace node. 917 * 918 ******************************************************************************/ 919 920 ACPI_STATUS 921 AcpiAttachData ( 922 ACPI_HANDLE ObjHandle, 923 ACPI_OBJECT_HANDLER Handler, 924 void *Data) 925 { 926 ACPI_NAMESPACE_NODE *Node; 927 ACPI_STATUS Status; 928 929 930 /* Parameter validation */ 931 932 if (!ObjHandle || 933 !Handler || 934 !Data) 935 { 936 return (AE_BAD_PARAMETER); 937 } 938 939 Status = AcpiUtAcquireMutex (ACPI_MTX_NAMESPACE); 940 if (ACPI_FAILURE (Status)) 941 { 942 return (Status); 943 } 944 945 /* Convert and validate the handle */ 946 947 Node = AcpiNsValidateHandle (ObjHandle); 948 if (!Node) 949 { 950 Status = AE_BAD_PARAMETER; 951 goto UnlockAndExit; 952 } 953 954 Status = AcpiNsAttachData (Node, Handler, Data); 955 956 UnlockAndExit: 957 (void) AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE); 958 return (Status); 959 } 960 961 ACPI_EXPORT_SYMBOL (AcpiAttachData) 962 963 964 /******************************************************************************* 965 * 966 * FUNCTION: AcpiDetachData 967 * 968 * PARAMETERS: ObjHandle - Namespace node handle 969 * Handler - Handler used in call to AcpiAttachData 970 * 971 * RETURN: Status 972 * 973 * DESCRIPTION: Remove data that was previously attached to a node. 974 * 975 ******************************************************************************/ 976 977 ACPI_STATUS 978 AcpiDetachData ( 979 ACPI_HANDLE ObjHandle, 980 ACPI_OBJECT_HANDLER Handler) 981 { 982 ACPI_NAMESPACE_NODE *Node; 983 ACPI_STATUS Status; 984 985 986 /* Parameter validation */ 987 988 if (!ObjHandle || 989 !Handler) 990 { 991 return (AE_BAD_PARAMETER); 992 } 993 994 Status = AcpiUtAcquireMutex (ACPI_MTX_NAMESPACE); 995 if (ACPI_FAILURE (Status)) 996 { 997 return (Status); 998 } 999 1000 /* Convert and validate the handle */ 1001 1002 Node = AcpiNsValidateHandle (ObjHandle); 1003 if (!Node) 1004 { 1005 Status = AE_BAD_PARAMETER; 1006 goto UnlockAndExit; 1007 } 1008 1009 Status = AcpiNsDetachData (Node, Handler); 1010 1011 UnlockAndExit: 1012 (void) AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE); 1013 return (Status); 1014 } 1015 1016 ACPI_EXPORT_SYMBOL (AcpiDetachData) 1017 1018 1019 /******************************************************************************* 1020 * 1021 * FUNCTION: AcpiGetData 1022 * 1023 * PARAMETERS: ObjHandle - Namespace node 1024 * Handler - Handler used in call to AttachData 1025 * Data - Where the data is returned 1026 * 1027 * RETURN: Status 1028 * 1029 * DESCRIPTION: Retrieve data that was previously attached to a namespace node. 1030 * 1031 ******************************************************************************/ 1032 1033 ACPI_STATUS 1034 AcpiGetData ( 1035 ACPI_HANDLE ObjHandle, 1036 ACPI_OBJECT_HANDLER Handler, 1037 void **Data) 1038 { 1039 ACPI_NAMESPACE_NODE *Node; 1040 ACPI_STATUS Status; 1041 1042 1043 /* Parameter validation */ 1044 1045 if (!ObjHandle || 1046 !Handler || 1047 !Data) 1048 { 1049 return (AE_BAD_PARAMETER); 1050 } 1051 1052 Status = AcpiUtAcquireMutex (ACPI_MTX_NAMESPACE); 1053 if (ACPI_FAILURE (Status)) 1054 { 1055 return (Status); 1056 } 1057 1058 /* Convert and validate the handle */ 1059 1060 Node = AcpiNsValidateHandle (ObjHandle); 1061 if (!Node) 1062 { 1063 Status = AE_BAD_PARAMETER; 1064 goto UnlockAndExit; 1065 } 1066 1067 Status = AcpiNsGetAttachedData (Node, Handler, Data); 1068 1069 UnlockAndExit: 1070 (void) AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE); 1071 return (Status); 1072 } 1073 1074 ACPI_EXPORT_SYMBOL (AcpiGetData) 1075