1 /******************************************************************************* 2 * 3 * Module Name: nsxfeval - Public interfaces to the ACPI subsystem 4 * ACPI Object evaluation interfaces 5 * $Revision: 1.33 $ 6 * 7 ******************************************************************************/ 8 9 /****************************************************************************** 10 * 11 * 1. Copyright Notice 12 * 13 * Some or all of this work - Copyright (c) 1999 - 2008, Intel Corp. 14 * All rights reserved. 15 * 16 * 2. License 17 * 18 * 2.1. This is your license from Intel Corp. under its intellectual property 19 * rights. You may have additional license terms from the party that provided 20 * you this software, covering your right to use that party's intellectual 21 * property rights. 22 * 23 * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a 24 * copy of the source code appearing in this file ("Covered Code") an 25 * irrevocable, perpetual, worldwide license under Intel's copyrights in the 26 * base code distributed originally by Intel ("Original Intel Code") to copy, 27 * make derivatives, distribute, use and display any portion of the Covered 28 * Code in any form, with the right to sublicense such rights; and 29 * 30 * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent 31 * license (with the right to sublicense), under only those claims of Intel 32 * patents that are infringed by the Original Intel Code, to make, use, sell, 33 * offer to sell, and import the Covered Code and derivative works thereof 34 * solely to the minimum extent necessary to exercise the above copyright 35 * license, and in no event shall the patent license extend to any additions 36 * to or modifications of the Original Intel Code. No other license or right 37 * is granted directly or by implication, estoppel or otherwise; 38 * 39 * The above copyright and patent license is granted only if the following 40 * conditions are met: 41 * 42 * 3. Conditions 43 * 44 * 3.1. Redistribution of Source with Rights to Further Distribute Source. 45 * Redistribution of source code of any substantial portion of the Covered 46 * Code or modification with rights to further distribute source must include 47 * the above Copyright Notice, the above License, this list of Conditions, 48 * and the following Disclaimer and Export Compliance provision. In addition, 49 * Licensee must cause all Covered Code to which Licensee contributes to 50 * contain a file documenting the changes Licensee made to create that Covered 51 * Code and the date of any change. Licensee must include in that file the 52 * documentation of any changes made by any predecessor Licensee. Licensee 53 * must include a prominent statement that the modification is derived, 54 * directly or indirectly, from Original Intel Code. 55 * 56 * 3.2. Redistribution of Source with no Rights to Further Distribute Source. 57 * Redistribution of source code of any substantial portion of the Covered 58 * Code or modification without rights to further distribute source must 59 * include the following Disclaimer and Export Compliance provision in the 60 * documentation and/or other materials provided with distribution. In 61 * addition, Licensee may not authorize further sublicense of source of any 62 * portion of the Covered Code, and must include terms to the effect that the 63 * license from Licensee to its licensee is limited to the intellectual 64 * property embodied in the software Licensee provides to its licensee, and 65 * not to intellectual property embodied in modifications its licensee may 66 * make. 67 * 68 * 3.3. Redistribution of Executable. Redistribution in executable form of any 69 * substantial portion of the Covered Code or modification must reproduce the 70 * above Copyright Notice, and the following Disclaimer and Export Compliance 71 * provision in the documentation and/or other materials provided with the 72 * distribution. 73 * 74 * 3.4. Intel retains all right, title, and interest in and to the Original 75 * Intel Code. 76 * 77 * 3.5. Neither the name Intel nor any other trademark owned or controlled by 78 * Intel shall be used in advertising or otherwise to promote the sale, use or 79 * other dealings in products derived from or relating to the Covered Code 80 * without prior written authorization from Intel. 81 * 82 * 4. Disclaimer and Export Compliance 83 * 84 * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED 85 * HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE 86 * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE, 87 * INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY 88 * UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY 89 * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A 90 * PARTICULAR PURPOSE. 91 * 92 * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES 93 * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR 94 * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT, 95 * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY 96 * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL 97 * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS 98 * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY 99 * LIMITED REMEDY. 100 * 101 * 4.3. Licensee shall not export, either directly or indirectly, any of this 102 * software or system incorporating such software without first obtaining any 103 * required license or other approval from the U. S. Department of Commerce or 104 * any other agency or department of the United States Government. In the 105 * event Licensee exports any such software from the United States or 106 * re-exports any such software from a foreign destination, Licensee shall 107 * ensure that the distribution and export/re-export of the software is in 108 * compliance with all laws, regulations, orders, or other restrictions of the 109 * U.S. Export Administration Regulations. Licensee agrees that neither it nor 110 * any of its subsidiaries will export/re-export any technical data, process, 111 * software, or service, directly or indirectly, to any country for which the 112 * United States government or any agency thereof requires an export license, 113 * other governmental approval, or letter of assurance, without first obtaining 114 * such license, approval or letter. 115 * 116 *****************************************************************************/ 117 118 119 #define __NSXFEVAL_C__ 120 121 #include "acpi.h" 122 #include "acnamesp.h" 123 #include "acinterp.h" 124 125 126 #define _COMPONENT ACPI_NAMESPACE 127 ACPI_MODULE_NAME ("nsxfeval") 128 129 /* Local prototypes */ 130 131 static void 132 AcpiNsResolveReferences ( 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 ******************************************************************************/ 156 157 ACPI_STATUS 158 AcpiEvaluateObjectTyped ( 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 } 232 233 ACPI_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 ******************************************************************************/ 255 256 ACPI_STATUS 257 AcpiEvaluateObject ( 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 } 444 445 446 Cleanup: 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 } 460 461 ACPI_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 ******************************************************************************/ 484 485 static void 486 AcpiNsResolveReferences ( 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 (ACPI_GET_OBJECT_TYPE (Info->ReturnObject) != 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 ******************************************************************************/ 569 570 ACPI_STATUS 571 AcpiWalkNamespace ( 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 * Lock the namespace around the walk. 596 * The namespace will be unlocked/locked around each call 597 * to the user function - since this function 598 * must be allowed to make Acpi calls itself. 599 */ 600 Status = AcpiUtAcquireMutex (ACPI_MTX_NAMESPACE); 601 if (ACPI_FAILURE (Status)) 602 { 603 return_ACPI_STATUS (Status); 604 } 605 606 Status = AcpiNsWalkNamespace (Type, StartObject, MaxDepth, 607 ACPI_NS_WALK_UNLOCK, 608 UserFunction, Context, ReturnValue); 609 610 (void) AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE); 611 return_ACPI_STATUS (Status); 612 } 613 614 ACPI_EXPORT_SYMBOL (AcpiWalkNamespace) 615 616 617 /******************************************************************************* 618 * 619 * FUNCTION: AcpiNsGetDeviceCallback 620 * 621 * PARAMETERS: Callback from AcpiGetDevice 622 * 623 * RETURN: Status 624 * 625 * DESCRIPTION: Takes callbacks from WalkNamespace and filters out all non- 626 * present devices, or if they specified a HID, it filters based 627 * on that. 628 * 629 ******************************************************************************/ 630 631 static ACPI_STATUS 632 AcpiNsGetDeviceCallback ( 633 ACPI_HANDLE ObjHandle, 634 UINT32 NestingLevel, 635 void *Context, 636 void **ReturnValue) 637 { 638 ACPI_GET_DEVICES_INFO *Info = Context; 639 ACPI_STATUS Status; 640 ACPI_NAMESPACE_NODE *Node; 641 UINT32 Flags; 642 ACPI_DEVICE_ID Hid; 643 ACPI_COMPATIBLE_ID_LIST *Cid; 644 UINT32 i; 645 BOOLEAN Found; 646 647 648 Status = AcpiUtAcquireMutex (ACPI_MTX_NAMESPACE); 649 if (ACPI_FAILURE (Status)) 650 { 651 return (Status); 652 } 653 654 Node = AcpiNsMapHandleToNode (ObjHandle); 655 Status = AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE); 656 if (ACPI_FAILURE (Status)) 657 { 658 return (Status); 659 } 660 661 if (!Node) 662 { 663 return (AE_BAD_PARAMETER); 664 } 665 666 /* Run _STA to determine if device is present */ 667 668 Status = AcpiUtExecute_STA (Node, &Flags); 669 if (ACPI_FAILURE (Status)) 670 { 671 return (AE_CTRL_DEPTH); 672 } 673 674 if (!(Flags & ACPI_STA_DEVICE_PRESENT) && 675 !(Flags & ACPI_STA_DEVICE_FUNCTIONING)) 676 { 677 /* 678 * Don't examine the children of the device only when the 679 * device is neither present nor functional. See ACPI spec, 680 * description of _STA for more information. 681 */ 682 return (AE_CTRL_DEPTH); 683 } 684 685 /* Filter based on device HID & CID */ 686 687 if (Info->Hid != NULL) 688 { 689 Status = AcpiUtExecute_HID (Node, &Hid); 690 if (Status == AE_NOT_FOUND) 691 { 692 return (AE_OK); 693 } 694 else if (ACPI_FAILURE (Status)) 695 { 696 return (AE_CTRL_DEPTH); 697 } 698 699 if (ACPI_STRNCMP (Hid.Value, Info->Hid, sizeof (Hid.Value)) != 0) 700 { 701 /* 702 * HID does not match, attempt match within the 703 * list of Compatible IDs (CIDs) 704 */ 705 Status = AcpiUtExecute_CID (Node, &Cid); 706 if (Status == AE_NOT_FOUND) 707 { 708 return (AE_OK); 709 } 710 else if (ACPI_FAILURE (Status)) 711 { 712 return (AE_CTRL_DEPTH); 713 } 714 715 /* Walk the CID list */ 716 717 Found = FALSE; 718 for (i = 0; i < Cid->Count; i++) 719 { 720 if (ACPI_STRNCMP (Cid->Id[i].Value, Info->Hid, 721 sizeof (ACPI_COMPATIBLE_ID)) == 0) 722 { 723 /* Found a matching CID */ 724 725 Found = TRUE; 726 break; 727 } 728 } 729 730 ACPI_FREE (Cid); 731 if (!Found) 732 { 733 return (AE_OK); 734 } 735 } 736 } 737 738 /* We have a valid device, invoke the user function */ 739 740 Status = Info->UserFunction (ObjHandle, NestingLevel, Info->Context, 741 ReturnValue); 742 return (Status); 743 } 744 745 746 /******************************************************************************* 747 * 748 * FUNCTION: AcpiGetDevices 749 * 750 * PARAMETERS: HID - HID to search for. Can be NULL. 751 * UserFunction - Called when a matching object is found 752 * Context - Passed to user function 753 * ReturnValue - Location where return value of 754 * UserFunction is put if terminated early 755 * 756 * RETURNS Return value from the UserFunction if terminated early. 757 * Otherwise, returns NULL. 758 * 759 * DESCRIPTION: Performs a modified depth-first walk of the namespace tree, 760 * starting (and ending) at the object specified by StartHandle. 761 * The UserFunction is called whenever an object of type 762 * Device is found. If the user function returns 763 * a non-zero value, the search is terminated immediately and this 764 * value is returned to the caller. 765 * 766 * This is a wrapper for WalkNamespace, but the callback performs 767 * additional filtering. Please see AcpiNsGetDeviceCallback. 768 * 769 ******************************************************************************/ 770 771 ACPI_STATUS 772 AcpiGetDevices ( 773 char *HID, 774 ACPI_WALK_CALLBACK UserFunction, 775 void *Context, 776 void **ReturnValue) 777 { 778 ACPI_STATUS Status; 779 ACPI_GET_DEVICES_INFO Info; 780 781 782 ACPI_FUNCTION_TRACE (AcpiGetDevices); 783 784 785 /* Parameter validation */ 786 787 if (!UserFunction) 788 { 789 return_ACPI_STATUS (AE_BAD_PARAMETER); 790 } 791 792 /* 793 * We're going to call their callback from OUR callback, so we need 794 * to know what it is, and their context parameter. 795 */ 796 Info.Hid = HID; 797 Info.Context = Context; 798 Info.UserFunction = UserFunction; 799 800 /* 801 * Lock the namespace around the walk. 802 * The namespace will be unlocked/locked around each call 803 * to the user function - since this function 804 * must be allowed to make Acpi calls itself. 805 */ 806 Status = AcpiUtAcquireMutex (ACPI_MTX_NAMESPACE); 807 if (ACPI_FAILURE (Status)) 808 { 809 return_ACPI_STATUS (Status); 810 } 811 812 Status = AcpiNsWalkNamespace (ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, 813 ACPI_UINT32_MAX, ACPI_NS_WALK_UNLOCK, 814 AcpiNsGetDeviceCallback, &Info, ReturnValue); 815 816 (void) AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE); 817 return_ACPI_STATUS (Status); 818 } 819 820 ACPI_EXPORT_SYMBOL (AcpiGetDevices) 821 822 823 /******************************************************************************* 824 * 825 * FUNCTION: AcpiAttachData 826 * 827 * PARAMETERS: ObjHandle - Namespace node 828 * Handler - Handler for this attachment 829 * Data - Pointer to data to be attached 830 * 831 * RETURN: Status 832 * 833 * DESCRIPTION: Attach arbitrary data and handler to a namespace node. 834 * 835 ******************************************************************************/ 836 837 ACPI_STATUS 838 AcpiAttachData ( 839 ACPI_HANDLE ObjHandle, 840 ACPI_OBJECT_HANDLER Handler, 841 void *Data) 842 { 843 ACPI_NAMESPACE_NODE *Node; 844 ACPI_STATUS Status; 845 846 847 /* Parameter validation */ 848 849 if (!ObjHandle || 850 !Handler || 851 !Data) 852 { 853 return (AE_BAD_PARAMETER); 854 } 855 856 Status = AcpiUtAcquireMutex (ACPI_MTX_NAMESPACE); 857 if (ACPI_FAILURE (Status)) 858 { 859 return (Status); 860 } 861 862 /* Convert and validate the handle */ 863 864 Node = AcpiNsMapHandleToNode (ObjHandle); 865 if (!Node) 866 { 867 Status = AE_BAD_PARAMETER; 868 goto UnlockAndExit; 869 } 870 871 Status = AcpiNsAttachData (Node, Handler, Data); 872 873 UnlockAndExit: 874 (void) AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE); 875 return (Status); 876 } 877 878 ACPI_EXPORT_SYMBOL (AcpiAttachData) 879 880 881 /******************************************************************************* 882 * 883 * FUNCTION: AcpiDetachData 884 * 885 * PARAMETERS: ObjHandle - Namespace node handle 886 * Handler - Handler used in call to AcpiAttachData 887 * 888 * RETURN: Status 889 * 890 * DESCRIPTION: Remove data that was previously attached to a node. 891 * 892 ******************************************************************************/ 893 894 ACPI_STATUS 895 AcpiDetachData ( 896 ACPI_HANDLE ObjHandle, 897 ACPI_OBJECT_HANDLER Handler) 898 { 899 ACPI_NAMESPACE_NODE *Node; 900 ACPI_STATUS Status; 901 902 903 /* Parameter validation */ 904 905 if (!ObjHandle || 906 !Handler) 907 { 908 return (AE_BAD_PARAMETER); 909 } 910 911 Status = AcpiUtAcquireMutex (ACPI_MTX_NAMESPACE); 912 if (ACPI_FAILURE (Status)) 913 { 914 return (Status); 915 } 916 917 /* Convert and validate the handle */ 918 919 Node = AcpiNsMapHandleToNode (ObjHandle); 920 if (!Node) 921 { 922 Status = AE_BAD_PARAMETER; 923 goto UnlockAndExit; 924 } 925 926 Status = AcpiNsDetachData (Node, Handler); 927 928 UnlockAndExit: 929 (void) AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE); 930 return (Status); 931 } 932 933 ACPI_EXPORT_SYMBOL (AcpiDetachData) 934 935 936 /******************************************************************************* 937 * 938 * FUNCTION: AcpiGetData 939 * 940 * PARAMETERS: ObjHandle - Namespace node 941 * Handler - Handler used in call to AttachData 942 * Data - Where the data is returned 943 * 944 * RETURN: Status 945 * 946 * DESCRIPTION: Retrieve data that was previously attached to a namespace node. 947 * 948 ******************************************************************************/ 949 950 ACPI_STATUS 951 AcpiGetData ( 952 ACPI_HANDLE ObjHandle, 953 ACPI_OBJECT_HANDLER Handler, 954 void **Data) 955 { 956 ACPI_NAMESPACE_NODE *Node; 957 ACPI_STATUS Status; 958 959 960 /* Parameter validation */ 961 962 if (!ObjHandle || 963 !Handler || 964 !Data) 965 { 966 return (AE_BAD_PARAMETER); 967 } 968 969 Status = AcpiUtAcquireMutex (ACPI_MTX_NAMESPACE); 970 if (ACPI_FAILURE (Status)) 971 { 972 return (Status); 973 } 974 975 /* Convert and validate the handle */ 976 977 Node = AcpiNsMapHandleToNode (ObjHandle); 978 if (!Node) 979 { 980 Status = AE_BAD_PARAMETER; 981 goto UnlockAndExit; 982 } 983 984 Status = AcpiNsGetAttachedData (Node, Handler, Data); 985 986 UnlockAndExit: 987 (void) AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE); 988 return (Status); 989 } 990 991 ACPI_EXPORT_SYMBOL (AcpiGetData) 992 993 994