nsxfeval.c revision 197104
1/******************************************************************************* 2 * 3 * Module Name: nsxfeval - Public interfaces to the ACPI subsystem 4 * ACPI Object evaluation interfaces 5 * 6 ******************************************************************************/ 7 8/****************************************************************************** 9 * 10 * 1. Copyright Notice 11 * 12 * Some or all of this work - Copyright (c) 1999 - 2009, Intel Corp. 13 * All rights reserved. 14 * 15 * 2. License 16 * 17 * 2.1. This is your license from Intel Corp. under its intellectual property 18 * rights. You may have additional license terms from the party that provided 19 * you this software, covering your right to use that party's intellectual 20 * property rights. 21 * 22 * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a 23 * copy of the source code appearing in this file ("Covered Code") an 24 * irrevocable, perpetual, worldwide license under Intel's copyrights in the 25 * base code distributed originally by Intel ("Original Intel Code") to copy, 26 * make derivatives, distribute, use and display any portion of the Covered 27 * Code in any form, with the right to sublicense such rights; and 28 * 29 * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent 30 * license (with the right to sublicense), under only those claims of Intel 31 * patents that are infringed by the Original Intel Code, to make, use, sell, 32 * offer to sell, and import the Covered Code and derivative works thereof 33 * solely to the minimum extent necessary to exercise the above copyright 34 * license, and in no event shall the patent license extend to any additions 35 * to or modifications of the Original Intel Code. No other license or right 36 * is granted directly or by implication, estoppel or otherwise; 37 * 38 * The above copyright and patent license is granted only if the following 39 * conditions are met: 40 * 41 * 3. Conditions 42 * 43 * 3.1. Redistribution of Source with Rights to Further Distribute Source. 44 * Redistribution of source code of any substantial portion of the Covered 45 * Code or modification with rights to further distribute source must include 46 * the above Copyright Notice, the above License, this list of Conditions, 47 * and the following Disclaimer and Export Compliance provision. In addition, 48 * Licensee must cause all Covered Code to which Licensee contributes to 49 * contain a file documenting the changes Licensee made to create that Covered 50 * Code and the date of any change. Licensee must include in that file the 51 * documentation of any changes made by any predecessor Licensee. Licensee 52 * must include a prominent statement that the modification is derived, 53 * directly or indirectly, from Original Intel Code. 54 * 55 * 3.2. Redistribution of Source with no Rights to Further Distribute Source. 56 * Redistribution of source code of any substantial portion of the Covered 57 * Code or modification without rights to further distribute source must 58 * include the following Disclaimer and Export Compliance provision in the 59 * documentation and/or other materials provided with distribution. In 60 * addition, Licensee may not authorize further sublicense of source of any 61 * portion of the Covered Code, and must include terms to the effect that the 62 * license from Licensee to its licensee is limited to the intellectual 63 * property embodied in the software Licensee provides to its licensee, and 64 * not to intellectual property embodied in modifications its licensee may 65 * make. 66 * 67 * 3.3. Redistribution of Executable. Redistribution in executable form of any 68 * substantial portion of the Covered Code or modification must reproduce the 69 * above Copyright Notice, and the following Disclaimer and Export Compliance 70 * provision in the documentation and/or other materials provided with the 71 * distribution. 72 * 73 * 3.4. Intel retains all right, title, and interest in and to the Original 74 * Intel Code. 75 * 76 * 3.5. Neither the name Intel nor any other trademark owned or controlled by 77 * Intel shall be used in advertising or otherwise to promote the sale, use or 78 * other dealings in products derived from or relating to the Covered Code 79 * without prior written authorization from Intel. 80 * 81 * 4. Disclaimer and Export Compliance 82 * 83 * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED 84 * HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE 85 * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE, 86 * INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY 87 * UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY 88 * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A 89 * PARTICULAR PURPOSE. 90 * 91 * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES 92 * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR 93 * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT, 94 * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY 95 * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL 96 * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS 97 * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY 98 * LIMITED REMEDY. 99 * 100 * 4.3. Licensee shall not export, either directly or indirectly, any of this 101 * software or system incorporating such software without first obtaining any 102 * required license or other approval from the U. S. Department of Commerce or 103 * any other agency or department of the United States Government. In the 104 * event Licensee exports any such software from the United States or 105 * re-exports any such software from a foreign destination, Licensee shall 106 * ensure that the distribution and export/re-export of the software is in 107 * compliance with all laws, regulations, orders, or other restrictions of the 108 * U.S. Export Administration Regulations. Licensee agrees that neither it nor 109 * any of its subsidiaries will export/re-export any technical data, process, 110 * software, or service, directly or indirectly, to any country for which the 111 * United States government or any agency thereof requires an export license, 112 * other governmental approval, or letter of assurance, without first obtaining 113 * such license, approval or letter. 114 * 115 *****************************************************************************/ 116 117 118#define __NSXFEVAL_C__ 119 120#include <contrib/dev/acpica/include/acpi.h> 121#include <contrib/dev/acpica/include/accommon.h> 122#include <contrib/dev/acpica/include/acnamesp.h> 123#include <contrib/dev/acpica/include/acinterp.h> 124 125 126#define _COMPONENT ACPI_NAMESPACE 127 ACPI_MODULE_NAME ("nsxfeval") 128 129/* Local prototypes */ 130 131static void 132AcpiNsResolveReferences ( 133 ACPI_EVALUATE_INFO *Info); 134 135 136/******************************************************************************* 137 * 138 * FUNCTION: AcpiEvaluateObjectTyped 139 * 140 * PARAMETERS: Handle - Object handle (optional) 141 * Pathname - Object pathname (optional) 142 * ExternalParams - List of parameters to pass to method, 143 * terminated by NULL. May be NULL 144 * if no parameters are being passed. 145 * ReturnBuffer - Where to put method's return value (if 146 * any). If NULL, no value is returned. 147 * ReturnType - Expected type of return object 148 * 149 * RETURN: Status 150 * 151 * DESCRIPTION: Find and evaluate the given object, passing the given 152 * parameters if necessary. One of "Handle" or "Pathname" must 153 * be valid (non-null) 154 * 155 ******************************************************************************/ 156 157ACPI_STATUS 158AcpiEvaluateObjectTyped ( 159 ACPI_HANDLE Handle, 160 ACPI_STRING Pathname, 161 ACPI_OBJECT_LIST *ExternalParams, 162 ACPI_BUFFER *ReturnBuffer, 163 ACPI_OBJECT_TYPE ReturnType) 164{ 165 ACPI_STATUS Status; 166 BOOLEAN MustFree = FALSE; 167 168 169 ACPI_FUNCTION_TRACE (AcpiEvaluateObjectTyped); 170 171 172 /* Return buffer must be valid */ 173 174 if (!ReturnBuffer) 175 { 176 return_ACPI_STATUS (AE_BAD_PARAMETER); 177 } 178 179 if (ReturnBuffer->Length == ACPI_ALLOCATE_BUFFER) 180 { 181 MustFree = TRUE; 182 } 183 184 /* Evaluate the object */ 185 186 Status = AcpiEvaluateObject (Handle, Pathname, ExternalParams, ReturnBuffer); 187 if (ACPI_FAILURE (Status)) 188 { 189 return_ACPI_STATUS (Status); 190 } 191 192 /* Type ANY means "don't care" */ 193 194 if (ReturnType == ACPI_TYPE_ANY) 195 { 196 return_ACPI_STATUS (AE_OK); 197 } 198 199 if (ReturnBuffer->Length == 0) 200 { 201 /* Error because caller specifically asked for a return value */ 202 203 ACPI_ERROR ((AE_INFO, "No return value")); 204 return_ACPI_STATUS (AE_NULL_OBJECT); 205 } 206 207 /* Examine the object type returned from EvaluateObject */ 208 209 if (((ACPI_OBJECT *) ReturnBuffer->Pointer)->Type == ReturnType) 210 { 211 return_ACPI_STATUS (AE_OK); 212 } 213 214 /* Return object type does not match requested type */ 215 216 ACPI_ERROR ((AE_INFO, 217 "Incorrect return type [%s] requested [%s]", 218 AcpiUtGetTypeName (((ACPI_OBJECT *) ReturnBuffer->Pointer)->Type), 219 AcpiUtGetTypeName (ReturnType))); 220 221 if (MustFree) 222 { 223 /* Caller used ACPI_ALLOCATE_BUFFER, free the return buffer */ 224 225 AcpiOsFree (ReturnBuffer->Pointer); 226 ReturnBuffer->Pointer = NULL; 227 } 228 229 ReturnBuffer->Length = 0; 230 return_ACPI_STATUS (AE_TYPE); 231} 232 233ACPI_EXPORT_SYMBOL (AcpiEvaluateObjectTyped) 234 235 236/******************************************************************************* 237 * 238 * FUNCTION: AcpiEvaluateObject 239 * 240 * PARAMETERS: Handle - Object handle (optional) 241 * Pathname - Object pathname (optional) 242 * ExternalParams - List of parameters to pass to method, 243 * terminated by NULL. May be NULL 244 * if no parameters are being passed. 245 * ReturnBuffer - Where to put method's return value (if 246 * any). If NULL, no value is returned. 247 * 248 * RETURN: Status 249 * 250 * DESCRIPTION: Find and evaluate the given object, passing the given 251 * parameters if necessary. One of "Handle" or "Pathname" must 252 * be valid (non-null) 253 * 254 ******************************************************************************/ 255 256ACPI_STATUS 257AcpiEvaluateObject ( 258 ACPI_HANDLE Handle, 259 ACPI_STRING Pathname, 260 ACPI_OBJECT_LIST *ExternalParams, 261 ACPI_BUFFER *ReturnBuffer) 262{ 263 ACPI_STATUS Status; 264 ACPI_EVALUATE_INFO *Info; 265 ACPI_SIZE BufferSpaceNeeded; 266 UINT32 i; 267 268 269 ACPI_FUNCTION_TRACE (AcpiEvaluateObject); 270 271 272 /* Allocate and initialize the evaluation information block */ 273 274 Info = ACPI_ALLOCATE_ZEROED (sizeof (ACPI_EVALUATE_INFO)); 275 if (!Info) 276 { 277 return_ACPI_STATUS (AE_NO_MEMORY); 278 } 279 280 Info->Pathname = Pathname; 281 282 /* Convert and validate the device handle */ 283 284 Info->PrefixNode = AcpiNsMapHandleToNode (Handle); 285 if (!Info->PrefixNode) 286 { 287 Status = AE_BAD_PARAMETER; 288 goto Cleanup; 289 } 290 291 /* 292 * If there are parameters to be passed to a control method, the external 293 * objects must all be converted to internal objects 294 */ 295 if (ExternalParams && ExternalParams->Count) 296 { 297 /* 298 * Allocate a new parameter block for the internal objects 299 * Add 1 to count to allow for null terminated internal list 300 */ 301 Info->Parameters = ACPI_ALLOCATE_ZEROED ( 302 ((ACPI_SIZE) ExternalParams->Count + 1) * sizeof (void *)); 303 if (!Info->Parameters) 304 { 305 Status = AE_NO_MEMORY; 306 goto Cleanup; 307 } 308 309 /* Convert each external object in the list to an internal object */ 310 311 for (i = 0; i < ExternalParams->Count; i++) 312 { 313 Status = AcpiUtCopyEobjectToIobject ( 314 &ExternalParams->Pointer[i], &Info->Parameters[i]); 315 if (ACPI_FAILURE (Status)) 316 { 317 goto Cleanup; 318 } 319 } 320 Info->Parameters[ExternalParams->Count] = NULL; 321 } 322 323 /* 324 * Three major cases: 325 * 1) Fully qualified pathname 326 * 2) No handle, not fully qualified pathname (error) 327 * 3) Valid handle 328 */ 329 if ((Pathname) && 330 (AcpiNsValidRootPrefix (Pathname[0]))) 331 { 332 /* The path is fully qualified, just evaluate by name */ 333 334 Info->PrefixNode = NULL; 335 Status = AcpiNsEvaluate (Info); 336 } 337 else if (!Handle) 338 { 339 /* 340 * A handle is optional iff a fully qualified pathname is specified. 341 * Since we've already handled fully qualified names above, this is 342 * an error 343 */ 344 if (!Pathname) 345 { 346 ACPI_DEBUG_PRINT ((ACPI_DB_INFO, 347 "Both Handle and Pathname are NULL")); 348 } 349 else 350 { 351 ACPI_DEBUG_PRINT ((ACPI_DB_INFO, 352 "Null Handle with relative pathname [%s]", Pathname)); 353 } 354 355 Status = AE_BAD_PARAMETER; 356 } 357 else 358 { 359 /* We have a namespace a node and a possible relative path */ 360 361 Status = AcpiNsEvaluate (Info); 362 } 363 364 /* 365 * If we are expecting a return value, and all went well above, 366 * copy the return value to an external object. 367 */ 368 if (ReturnBuffer) 369 { 370 if (!Info->ReturnObject) 371 { 372 ReturnBuffer->Length = 0; 373 } 374 else 375 { 376 if (ACPI_GET_DESCRIPTOR_TYPE (Info->ReturnObject) == 377 ACPI_DESC_TYPE_NAMED) 378 { 379 /* 380 * If we received a NS Node as a return object, this means that 381 * the object we are evaluating has nothing interesting to 382 * return (such as a mutex, etc.) We return an error because 383 * these types are essentially unsupported by this interface. 384 * We don't check up front because this makes it easier to add 385 * support for various types at a later date if necessary. 386 */ 387 Status = AE_TYPE; 388 Info->ReturnObject = NULL; /* No need to delete a NS Node */ 389 ReturnBuffer->Length = 0; 390 } 391 392 if (ACPI_SUCCESS (Status)) 393 { 394 /* Dereference Index and RefOf references */ 395 396 AcpiNsResolveReferences (Info); 397 398 /* Get the size of the returned object */ 399 400 Status = AcpiUtGetObjectSize (Info->ReturnObject, 401 &BufferSpaceNeeded); 402 if (ACPI_SUCCESS (Status)) 403 { 404 /* Validate/Allocate/Clear caller buffer */ 405 406 Status = AcpiUtInitializeBuffer (ReturnBuffer, 407 BufferSpaceNeeded); 408 if (ACPI_FAILURE (Status)) 409 { 410 /* 411 * Caller's buffer is too small or a new one can't 412 * be allocated 413 */ 414 ACPI_DEBUG_PRINT ((ACPI_DB_INFO, 415 "Needed buffer size %X, %s\n", 416 (UINT32) BufferSpaceNeeded, 417 AcpiFormatException (Status))); 418 } 419 else 420 { 421 /* We have enough space for the object, build it */ 422 423 Status = AcpiUtCopyIobjectToEobject (Info->ReturnObject, 424 ReturnBuffer); 425 } 426 } 427 } 428 } 429 } 430 431 if (Info->ReturnObject) 432 { 433 /* 434 * Delete the internal return object. NOTE: Interpreter must be 435 * locked to avoid race condition. 436 */ 437 AcpiExEnterInterpreter (); 438 439 /* Remove one reference on the return object (should delete it) */ 440 441 AcpiUtRemoveReference (Info->ReturnObject); 442 AcpiExExitInterpreter (); 443 } 444 445 446Cleanup: 447 448 /* Free the input parameter list (if we created one) */ 449 450 if (Info->Parameters) 451 { 452 /* Free the allocated parameter block */ 453 454 AcpiUtDeleteInternalObjectList (Info->Parameters); 455 } 456 457 ACPI_FREE (Info); 458 return_ACPI_STATUS (Status); 459} 460 461ACPI_EXPORT_SYMBOL (AcpiEvaluateObject) 462 463 464/******************************************************************************* 465 * 466 * FUNCTION: AcpiNsResolveReferences 467 * 468 * PARAMETERS: Info - Evaluation info block 469 * 470 * RETURN: Info->ReturnObject is replaced with the dereferenced object 471 * 472 * DESCRIPTION: Dereference certain reference objects. Called before an 473 * internal return object is converted to an external ACPI_OBJECT. 474 * 475 * Performs an automatic dereference of Index and RefOf reference objects. 476 * These reference objects are not supported by the ACPI_OBJECT, so this is a 477 * last resort effort to return something useful. Also, provides compatibility 478 * with other ACPI implementations. 479 * 480 * NOTE: does not handle references within returned package objects or nested 481 * references, but this support could be added later if found to be necessary. 482 * 483 ******************************************************************************/ 484 485static void 486AcpiNsResolveReferences ( 487 ACPI_EVALUATE_INFO *Info) 488{ 489 ACPI_OPERAND_OBJECT *ObjDesc = NULL; 490 ACPI_NAMESPACE_NODE *Node; 491 492 493 /* We are interested in reference objects only */ 494 495 if ((Info->ReturnObject)->Common.Type != ACPI_TYPE_LOCAL_REFERENCE) 496 { 497 return; 498 } 499 500 /* 501 * Two types of references are supported - those created by Index and 502 * RefOf operators. A name reference (AML_NAMEPATH_OP) can be converted 503 * to an ACPI_OBJECT, so it is not dereferenced here. A DdbHandle 504 * (AML_LOAD_OP) cannot be dereferenced, nor can it be converted to 505 * an ACPI_OBJECT. 506 */ 507 switch (Info->ReturnObject->Reference.Class) 508 { 509 case ACPI_REFCLASS_INDEX: 510 511 ObjDesc = *(Info->ReturnObject->Reference.Where); 512 break; 513 514 case ACPI_REFCLASS_REFOF: 515 516 Node = Info->ReturnObject->Reference.Object; 517 if (Node) 518 { 519 ObjDesc = Node->Object; 520 } 521 break; 522 523 default: 524 return; 525 } 526 527 /* Replace the existing reference object */ 528 529 if (ObjDesc) 530 { 531 AcpiUtAddReference (ObjDesc); 532 AcpiUtRemoveReference (Info->ReturnObject); 533 Info->ReturnObject = ObjDesc; 534 } 535 536 return; 537} 538 539 540/******************************************************************************* 541 * 542 * FUNCTION: AcpiWalkNamespace 543 * 544 * PARAMETERS: Type - ACPI_OBJECT_TYPE to search for 545 * StartObject - Handle in namespace where search begins 546 * MaxDepth - Depth to which search is to reach 547 * UserFunction - Called when an object of "Type" is found 548 * Context - Passed to user function 549 * ReturnValue - Location where return value of 550 * UserFunction is put if terminated early 551 * 552 * RETURNS Return value from the UserFunction if terminated early. 553 * Otherwise, returns NULL. 554 * 555 * DESCRIPTION: Performs a modified depth-first walk of the namespace tree, 556 * starting (and ending) at the object specified by StartHandle. 557 * The UserFunction is called whenever an object that matches 558 * the type parameter is found. If the user function returns 559 * a non-zero value, the search is terminated immediately and this 560 * value is returned to the caller. 561 * 562 * The point of this procedure is to provide a generic namespace 563 * walk routine that can be called from multiple places to 564 * provide multiple services; the User Function can be tailored 565 * to each task, whether it is a print function, a compare 566 * function, etc. 567 * 568 ******************************************************************************/ 569 570ACPI_STATUS 571AcpiWalkNamespace ( 572 ACPI_OBJECT_TYPE Type, 573 ACPI_HANDLE StartObject, 574 UINT32 MaxDepth, 575 ACPI_WALK_CALLBACK UserFunction, 576 void *Context, 577 void **ReturnValue) 578{ 579 ACPI_STATUS Status; 580 581 582 ACPI_FUNCTION_TRACE (AcpiWalkNamespace); 583 584 585 /* Parameter validation */ 586 587 if ((Type > ACPI_TYPE_LOCAL_MAX) || 588 (!MaxDepth) || 589 (!UserFunction)) 590 { 591 return_ACPI_STATUS (AE_BAD_PARAMETER); 592 } 593 594 /* 595 * Need to acquire the namespace reader lock to prevent interference 596 * with any concurrent table unloads (which causes the deletion of 597 * namespace objects). We cannot allow the deletion of a namespace node 598 * while the user function is using it. The exception to this are the 599 * nodes created and deleted during control method execution -- these 600 * nodes are marked as temporary nodes and are ignored by the namespace 601 * walk. Thus, control methods can be executed while holding the 602 * namespace deletion lock (and the user function can execute control 603 * methods.) 604 */ 605 Status = AcpiUtAcquireReadLock (&AcpiGbl_NamespaceRwLock); 606 if (ACPI_FAILURE (Status)) 607 { 608 return (Status); 609 } 610 611 /* 612 * Lock the namespace around the walk. The namespace will be 613 * unlocked/locked around each call to the user function - since the user 614 * function must be allowed to make ACPICA calls itself (for example, it 615 * will typically execute control methods during device enumeration.) 616 */ 617 Status = AcpiUtAcquireMutex (ACPI_MTX_NAMESPACE); 618 if (ACPI_FAILURE (Status)) 619 { 620 goto UnlockAndExit; 621 } 622 623 Status = AcpiNsWalkNamespace (Type, StartObject, MaxDepth, 624 ACPI_NS_WALK_UNLOCK, UserFunction, Context, ReturnValue); 625 626 (void) AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE); 627 628UnlockAndExit: 629 (void) AcpiUtReleaseReadLock (&AcpiGbl_NamespaceRwLock); 630 return_ACPI_STATUS (Status); 631} 632 633ACPI_EXPORT_SYMBOL (AcpiWalkNamespace) 634 635 636/******************************************************************************* 637 * 638 * FUNCTION: AcpiNsGetDeviceCallback 639 * 640 * PARAMETERS: Callback from AcpiGetDevice 641 * 642 * RETURN: Status 643 * 644 * DESCRIPTION: Takes callbacks from WalkNamespace and filters out all non- 645 * present devices, or if they specified a HID, it filters based 646 * on that. 647 * 648 ******************************************************************************/ 649 650static ACPI_STATUS 651AcpiNsGetDeviceCallback ( 652 ACPI_HANDLE ObjHandle, 653 UINT32 NestingLevel, 654 void *Context, 655 void **ReturnValue) 656{ 657 ACPI_GET_DEVICES_INFO *Info = Context; 658 ACPI_STATUS Status; 659 ACPI_NAMESPACE_NODE *Node; 660 UINT32 Flags; 661 ACPI_DEVICE_ID *Hid; 662 ACPI_DEVICE_ID_LIST *Cid; 663 UINT32 i; 664 BOOLEAN Found; 665 int NoMatch; 666 667 668 Status = AcpiUtAcquireMutex (ACPI_MTX_NAMESPACE); 669 if (ACPI_FAILURE (Status)) 670 { 671 return (Status); 672 } 673 674 Node = AcpiNsMapHandleToNode (ObjHandle); 675 Status = AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE); 676 if (ACPI_FAILURE (Status)) 677 { 678 return (Status); 679 } 680 681 if (!Node) 682 { 683 return (AE_BAD_PARAMETER); 684 } 685 686 /* Run _STA to determine if device is present */ 687 688 Status = AcpiUtExecute_STA (Node, &Flags); 689 if (ACPI_FAILURE (Status)) 690 { 691 return (AE_CTRL_DEPTH); 692 } 693 694 if (!(Flags & ACPI_STA_DEVICE_PRESENT) && 695 !(Flags & ACPI_STA_DEVICE_FUNCTIONING)) 696 { 697 /* 698 * Don't examine the children of the device only when the 699 * device is neither present nor functional. See ACPI spec, 700 * description of _STA for more information. 701 */ 702 return (AE_CTRL_DEPTH); 703 } 704 705 /* Filter based on device HID & CID */ 706 707 if (Info->Hid != NULL) 708 { 709 Status = AcpiUtExecute_HID (Node, &Hid); 710 if (Status == AE_NOT_FOUND) 711 { 712 return (AE_OK); 713 } 714 else if (ACPI_FAILURE (Status)) 715 { 716 return (AE_CTRL_DEPTH); 717 } 718 719 NoMatch = ACPI_STRCMP (Hid->String, Info->Hid); 720 ACPI_FREE (Hid); 721 722 if (NoMatch) 723 { 724 /* 725 * HID does not match, attempt match within the 726 * list of Compatible IDs (CIDs) 727 */ 728 Status = AcpiUtExecute_CID (Node, &Cid); 729 if (Status == AE_NOT_FOUND) 730 { 731 return (AE_OK); 732 } 733 else if (ACPI_FAILURE (Status)) 734 { 735 return (AE_CTRL_DEPTH); 736 } 737 738 /* Walk the CID list */ 739 740 Found = FALSE; 741 for (i = 0; i < Cid->Count; i++) 742 { 743 if (ACPI_STRCMP (Cid->Ids[i].String, Info->Hid) == 0) 744 { 745 /* Found a matching CID */ 746 747 Found = TRUE; 748 break; 749 } 750 } 751 752 ACPI_FREE (Cid); 753 if (!Found) 754 { 755 return (AE_OK); 756 } 757 } 758 } 759 760 /* We have a valid device, invoke the user function */ 761 762 Status = Info->UserFunction (ObjHandle, NestingLevel, Info->Context, 763 ReturnValue); 764 return (Status); 765} 766 767 768/******************************************************************************* 769 * 770 * FUNCTION: AcpiGetDevices 771 * 772 * PARAMETERS: HID - HID to search for. Can be NULL. 773 * UserFunction - Called when a matching object is found 774 * Context - Passed to user function 775 * ReturnValue - Location where return value of 776 * UserFunction is put if terminated early 777 * 778 * RETURNS Return value from the UserFunction if terminated early. 779 * Otherwise, returns NULL. 780 * 781 * DESCRIPTION: Performs a modified depth-first walk of the namespace tree, 782 * starting (and ending) at the object specified by StartHandle. 783 * The UserFunction is called whenever an object of type 784 * Device is found. If the user function returns 785 * a non-zero value, the search is terminated immediately and this 786 * value is returned to the caller. 787 * 788 * This is a wrapper for WalkNamespace, but the callback performs 789 * additional filtering. Please see AcpiNsGetDeviceCallback. 790 * 791 ******************************************************************************/ 792 793ACPI_STATUS 794AcpiGetDevices ( 795 char *HID, 796 ACPI_WALK_CALLBACK UserFunction, 797 void *Context, 798 void **ReturnValue) 799{ 800 ACPI_STATUS Status; 801 ACPI_GET_DEVICES_INFO Info; 802 803 804 ACPI_FUNCTION_TRACE (AcpiGetDevices); 805 806 807 /* Parameter validation */ 808 809 if (!UserFunction) 810 { 811 return_ACPI_STATUS (AE_BAD_PARAMETER); 812 } 813 814 /* 815 * We're going to call their callback from OUR callback, so we need 816 * to know what it is, and their context parameter. 817 */ 818 Info.Hid = HID; 819 Info.Context = Context; 820 Info.UserFunction = UserFunction; 821 822 /* 823 * Lock the namespace around the walk. 824 * The namespace will be unlocked/locked around each call 825 * to the user function - since this function 826 * must be allowed to make Acpi calls itself. 827 */ 828 Status = AcpiUtAcquireMutex (ACPI_MTX_NAMESPACE); 829 if (ACPI_FAILURE (Status)) 830 { 831 return_ACPI_STATUS (Status); 832 } 833 834 Status = AcpiNsWalkNamespace (ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, 835 ACPI_UINT32_MAX, ACPI_NS_WALK_UNLOCK, 836 AcpiNsGetDeviceCallback, &Info, ReturnValue); 837 838 (void) AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE); 839 return_ACPI_STATUS (Status); 840} 841 842ACPI_EXPORT_SYMBOL (AcpiGetDevices) 843 844 845/******************************************************************************* 846 * 847 * FUNCTION: AcpiAttachData 848 * 849 * PARAMETERS: ObjHandle - Namespace node 850 * Handler - Handler for this attachment 851 * Data - Pointer to data to be attached 852 * 853 * RETURN: Status 854 * 855 * DESCRIPTION: Attach arbitrary data and handler to a namespace node. 856 * 857 ******************************************************************************/ 858 859ACPI_STATUS 860AcpiAttachData ( 861 ACPI_HANDLE ObjHandle, 862 ACPI_OBJECT_HANDLER Handler, 863 void *Data) 864{ 865 ACPI_NAMESPACE_NODE *Node; 866 ACPI_STATUS Status; 867 868 869 /* Parameter validation */ 870 871 if (!ObjHandle || 872 !Handler || 873 !Data) 874 { 875 return (AE_BAD_PARAMETER); 876 } 877 878 Status = AcpiUtAcquireMutex (ACPI_MTX_NAMESPACE); 879 if (ACPI_FAILURE (Status)) 880 { 881 return (Status); 882 } 883 884 /* Convert and validate the handle */ 885 886 Node = AcpiNsMapHandleToNode (ObjHandle); 887 if (!Node) 888 { 889 Status = AE_BAD_PARAMETER; 890 goto UnlockAndExit; 891 } 892 893 Status = AcpiNsAttachData (Node, Handler, Data); 894 895UnlockAndExit: 896 (void) AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE); 897 return (Status); 898} 899 900ACPI_EXPORT_SYMBOL (AcpiAttachData) 901 902 903/******************************************************************************* 904 * 905 * FUNCTION: AcpiDetachData 906 * 907 * PARAMETERS: ObjHandle - Namespace node handle 908 * Handler - Handler used in call to AcpiAttachData 909 * 910 * RETURN: Status 911 * 912 * DESCRIPTION: Remove data that was previously attached to a node. 913 * 914 ******************************************************************************/ 915 916ACPI_STATUS 917AcpiDetachData ( 918 ACPI_HANDLE ObjHandle, 919 ACPI_OBJECT_HANDLER Handler) 920{ 921 ACPI_NAMESPACE_NODE *Node; 922 ACPI_STATUS Status; 923 924 925 /* Parameter validation */ 926 927 if (!ObjHandle || 928 !Handler) 929 { 930 return (AE_BAD_PARAMETER); 931 } 932 933 Status = AcpiUtAcquireMutex (ACPI_MTX_NAMESPACE); 934 if (ACPI_FAILURE (Status)) 935 { 936 return (Status); 937 } 938 939 /* Convert and validate the handle */ 940 941 Node = AcpiNsMapHandleToNode (ObjHandle); 942 if (!Node) 943 { 944 Status = AE_BAD_PARAMETER; 945 goto UnlockAndExit; 946 } 947 948 Status = AcpiNsDetachData (Node, Handler); 949 950UnlockAndExit: 951 (void) AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE); 952 return (Status); 953} 954 955ACPI_EXPORT_SYMBOL (AcpiDetachData) 956 957 958/******************************************************************************* 959 * 960 * FUNCTION: AcpiGetData 961 * 962 * PARAMETERS: ObjHandle - Namespace node 963 * Handler - Handler used in call to AttachData 964 * Data - Where the data is returned 965 * 966 * RETURN: Status 967 * 968 * DESCRIPTION: Retrieve data that was previously attached to a namespace node. 969 * 970 ******************************************************************************/ 971 972ACPI_STATUS 973AcpiGetData ( 974 ACPI_HANDLE ObjHandle, 975 ACPI_OBJECT_HANDLER Handler, 976 void **Data) 977{ 978 ACPI_NAMESPACE_NODE *Node; 979 ACPI_STATUS Status; 980 981 982 /* Parameter validation */ 983 984 if (!ObjHandle || 985 !Handler || 986 !Data) 987 { 988 return (AE_BAD_PARAMETER); 989 } 990 991 Status = AcpiUtAcquireMutex (ACPI_MTX_NAMESPACE); 992 if (ACPI_FAILURE (Status)) 993 { 994 return (Status); 995 } 996 997 /* Convert and validate the handle */ 998 999 Node = AcpiNsMapHandleToNode (ObjHandle); 1000 if (!Node) 1001 { 1002 Status = AE_BAD_PARAMETER; 1003 goto UnlockAndExit; 1004 } 1005 1006 Status = AcpiNsGetAttachedData (Node, Handler, Data); 1007 1008UnlockAndExit: 1009 (void) AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE); 1010 return (Status); 1011} 1012 1013ACPI_EXPORT_SYMBOL (AcpiGetData) 1014 1015 1016