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nsaccess.c
(32.23 KB)
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nsalloc.c
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nsarguments.c
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nsconvert.c
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nsdump.c
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nsdumpdv.c
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nseval.c
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nsinit.c
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nsload.c
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nsnames.c
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nsobject.c
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nsparse.c
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nspredef.c
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nsprepkg.c
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nsrepair.c
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nsrepair2.c
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nssearch.c
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nsutils.c
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nswalk.c
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nsxfeval.c
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nsxfname.c
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nsxfobj.c
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Editing: nsxfeval.c
/******************************************************************************* * * Module Name: nsxfeval - Public interfaces to the ACPI subsystem * ACPI Object evaluation interfaces * ******************************************************************************/ /****************************************************************************** * * 1. Copyright Notice * * Some or all of this work - Copyright (c) 1999 - 2020, Intel Corp. * All rights reserved. * * 2. License * * 2.1. This is your license from Intel Corp. under its intellectual property * rights. You may have additional license terms from the party that provided * you this software, covering your right to use that party's intellectual * property rights. * * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a * copy of the source code appearing in this file ("Covered Code") an * irrevocable, perpetual, worldwide license under Intel's copyrights in the * base code distributed originally by Intel ("Original Intel Code") to copy, * make derivatives, distribute, use and display any portion of the Covered * Code in any form, with the right to sublicense such rights; and * * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent * license (with the right to sublicense), under only those claims of Intel * patents that are infringed by the Original Intel Code, to make, use, sell, * offer to sell, and import the Covered Code and derivative works thereof * solely to the minimum extent necessary to exercise the above copyright * license, and in no event shall the patent license extend to any additions * to or modifications of the Original Intel Code. No other license or right * is granted directly or by implication, estoppel or otherwise; * * The above copyright and patent license is granted only if the following * conditions are met: * * 3. Conditions * * 3.1. Redistribution of Source with Rights to Further Distribute Source. * Redistribution of source code of any substantial portion of the Covered * Code or modification with rights to further distribute source must include * the above Copyright Notice, the above License, this list of Conditions, * and the following Disclaimer and Export Compliance provision. In addition, * Licensee must cause all Covered Code to which Licensee contributes to * contain a file documenting the changes Licensee made to create that Covered * Code and the date of any change. Licensee must include in that file the * documentation of any changes made by any predecessor Licensee. Licensee * must include a prominent statement that the modification is derived, * directly or indirectly, from Original Intel Code. * * 3.2. Redistribution of Source with no Rights to Further Distribute Source. * Redistribution of source code of any substantial portion of the Covered * Code or modification without rights to further distribute source must * include the following Disclaimer and Export Compliance provision in the * documentation and/or other materials provided with distribution. In * addition, Licensee may not authorize further sublicense of source of any * portion of the Covered Code, and must include terms to the effect that the * license from Licensee to its licensee is limited to the intellectual * property embodied in the software Licensee provides to its licensee, and * not to intellectual property embodied in modifications its licensee may * make. * * 3.3. Redistribution of Executable. Redistribution in executable form of any * substantial portion of the Covered Code or modification must reproduce the * above Copyright Notice, and the following Disclaimer and Export Compliance * provision in the documentation and/or other materials provided with the * distribution. * * 3.4. Intel retains all right, title, and interest in and to the Original * Intel Code. * * 3.5. Neither the name Intel nor any other trademark owned or controlled by * Intel shall be used in advertising or otherwise to promote the sale, use or * other dealings in products derived from or relating to the Covered Code * without prior written authorization from Intel. * * 4. Disclaimer and Export Compliance * * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED * HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE, * INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY * UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A * PARTICULAR PURPOSE. * * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT, * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY * LIMITED REMEDY. * * 4.3. Licensee shall not export, either directly or indirectly, any of this * software or system incorporating such software without first obtaining any * required license or other approval from the U. S. Department of Commerce or * any other agency or department of the United States Government. In the * event Licensee exports any such software from the United States or * re-exports any such software from a foreign destination, Licensee shall * ensure that the distribution and export/re-export of the software is in * compliance with all laws, regulations, orders, or other restrictions of the * U.S. Export Administration Regulations. Licensee agrees that neither it nor * any of its subsidiaries will export/re-export any technical data, process, * software, or service, directly or indirectly, to any country for which the * United States government or any agency thereof requires an export license, * other governmental approval, or letter of assurance, without first obtaining * such license, approval or letter. * ***************************************************************************** * * Alternatively, you may choose to be licensed under the terms of the * following license: * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions, and the following disclaimer, * without modification. * 2. Redistributions in binary form must reproduce at minimum a disclaimer * substantially similar to the "NO WARRANTY" disclaimer below * ("Disclaimer") and any redistribution must be conditioned upon * including a substantially similar Disclaimer requirement for further * binary redistribution. * 3. Neither the names of the above-listed copyright holders nor the names * of any contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * * Alternatively, you may choose to be licensed under the terms of the * GNU General Public License ("GPL") version 2 as published by the Free * Software Foundation. * *****************************************************************************/ #define EXPORT_ACPI_INTERFACES #include <contrib/dev/acpica/include/acpi.h> #include <contrib/dev/acpica/include/accommon.h> #include <contrib/dev/acpica/include/acnamesp.h> #include <contrib/dev/acpica/include/acinterp.h> #define _COMPONENT ACPI_NAMESPACE ACPI_MODULE_NAME ("nsxfeval") /* Local prototypes */ static void AcpiNsResolveReferences ( ACPI_EVALUATE_INFO *Info); /******************************************************************************* * * FUNCTION: AcpiEvaluateObjectTyped * * PARAMETERS: Handle - Object handle (optional) * Pathname - Object pathname (optional) * ExternalParams - List of parameters to pass to a method, * terminated by NULL. May be NULL * if no parameters are being passed. * ReturnBuffer - Where to put the object return value (if * any). Required. * ReturnType - Expected type of return object * * RETURN: Status * * DESCRIPTION: Find and evaluate the given object, passing the given * parameters if necessary. One of "Handle" or "Pathname" must * be valid (non-null) * ******************************************************************************/ ACPI_STATUS AcpiEvaluateObjectTyped ( ACPI_HANDLE Handle, ACPI_STRING Pathname, ACPI_OBJECT_LIST *ExternalParams, ACPI_BUFFER *ReturnBuffer, ACPI_OBJECT_TYPE ReturnType) { ACPI_STATUS Status; BOOLEAN FreeBufferOnError = FALSE; ACPI_HANDLE TargetHandle; char *FullPathname; ACPI_FUNCTION_TRACE (AcpiEvaluateObjectTyped); /* Return buffer must be valid */ if (!ReturnBuffer) { return_ACPI_STATUS (AE_BAD_PARAMETER); } if (ReturnBuffer->Length == ACPI_ALLOCATE_BUFFER) { FreeBufferOnError = TRUE; } /* Get a handle here, in order to build an error message if needed */ TargetHandle = Handle; if (Pathname) { Status = AcpiGetHandle (Handle, Pathname, &TargetHandle); if (ACPI_FAILURE (Status)) { return_ACPI_STATUS (Status); } } FullPathname = AcpiNsGetExternalPathname (TargetHandle); if (!FullPathname) { return_ACPI_STATUS (AE_NO_MEMORY); } /* Evaluate the object */ Status = AcpiEvaluateObject (TargetHandle, NULL, ExternalParams, ReturnBuffer); if (ACPI_FAILURE (Status)) { goto Exit; } /* Type ANY means "don't care about return value type" */ if (ReturnType == ACPI_TYPE_ANY) { goto Exit; } if (ReturnBuffer->Length == 0) { /* Error because caller specifically asked for a return value */ ACPI_ERROR ((AE_INFO, "%s did not return any object", FullPathname)); Status = AE_NULL_OBJECT; goto Exit; } /* Examine the object type returned from EvaluateObject */ if (((ACPI_OBJECT *) ReturnBuffer->Pointer)->Type == ReturnType) { goto Exit; } /* Return object type does not match requested type */ ACPI_ERROR ((AE_INFO, "Incorrect return type from %s - received [%s], requested [%s]", FullPathname, AcpiUtGetTypeName (((ACPI_OBJECT *) ReturnBuffer->Pointer)->Type), AcpiUtGetTypeName (ReturnType))); if (FreeBufferOnError) { /* * Free a buffer created via ACPI_ALLOCATE_BUFFER. * Note: We use AcpiOsFree here because AcpiOsAllocate was used * to allocate the buffer. This purposefully bypasses the * (optionally enabled) allocation tracking mechanism since we * only want to track internal allocations. */ AcpiOsFree (ReturnBuffer->Pointer); ReturnBuffer->Pointer = NULL; } ReturnBuffer->Length = 0; Status = AE_TYPE; Exit: ACPI_FREE (FullPathname); return_ACPI_STATUS (Status); } ACPI_EXPORT_SYMBOL (AcpiEvaluateObjectTyped) /******************************************************************************* * * FUNCTION: AcpiEvaluateObject * * PARAMETERS: Handle - Object handle (optional) * Pathname - Object pathname (optional) * ExternalParams - List of parameters to pass to method, * terminated by NULL. May be NULL * if no parameters are being passed. * ReturnBuffer - Where to put method's return value (if * any). If NULL, no value is returned. * * RETURN: Status * * DESCRIPTION: Find and evaluate the given object, passing the given * parameters if necessary. One of "Handle" or "Pathname" must * be valid (non-null) * ******************************************************************************/ ACPI_STATUS AcpiEvaluateObject ( ACPI_HANDLE Handle, ACPI_STRING Pathname, ACPI_OBJECT_LIST *ExternalParams, ACPI_BUFFER *ReturnBuffer) { ACPI_STATUS Status; ACPI_EVALUATE_INFO *Info; ACPI_SIZE BufferSpaceNeeded; UINT32 i; ACPI_FUNCTION_TRACE (AcpiEvaluateObject); /* Allocate and initialize the evaluation information block */ Info = ACPI_ALLOCATE_ZEROED (sizeof (ACPI_EVALUATE_INFO)); if (!Info) { return_ACPI_STATUS (AE_NO_MEMORY); } /* Convert and validate the device handle */ Info->PrefixNode = AcpiNsValidateHandle (Handle); if (!Info->PrefixNode) { Status = AE_BAD_PARAMETER; goto Cleanup; } /* * Get the actual namespace node for the target object. * Handles these cases: * * 1) Null node, valid pathname from root (absolute path) * 2) Node and valid pathname (path relative to Node) * 3) Node, Null pathname */ if ((Pathname) && (ACPI_IS_ROOT_PREFIX (Pathname[0]))) { /* The path is fully qualified, just evaluate by name */ Info->PrefixNode = NULL; } else if (!Handle) { /* * A handle is optional iff a fully qualified pathname is specified. * Since we've already handled fully qualified names above, this is * an error. */ if (!Pathname) { ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Both Handle and Pathname are NULL")); } else { ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Null Handle with relative pathname [%s]", Pathname)); } Status = AE_BAD_PARAMETER; goto Cleanup; } Info->RelativePathname = Pathname; /* * Convert all external objects passed as arguments to the * internal version(s). */ if (ExternalParams && ExternalParams->Count) { Info->ParamCount = (UINT16) ExternalParams->Count; /* Warn on impossible argument count */ if (Info->ParamCount > ACPI_METHOD_NUM_ARGS) { ACPI_WARN_PREDEFINED ((AE_INFO, Pathname, ACPI_WARN_ALWAYS, "Excess arguments (%u) - using only %u", Info->ParamCount, ACPI_METHOD_NUM_ARGS)); Info->ParamCount = ACPI_METHOD_NUM_ARGS; } /* * Allocate a new parameter block for the internal objects * Add 1 to count to allow for null terminated internal list */ Info->Parameters = ACPI_ALLOCATE_ZEROED ( ((ACPI_SIZE) Info->ParamCount + 1) * sizeof (void *)); if (!Info->Parameters) { Status = AE_NO_MEMORY; goto Cleanup; } /* Convert each external object in the list to an internal object */ for (i = 0; i < Info->ParamCount; i++) { Status = AcpiUtCopyEobjectToIobject ( &ExternalParams->Pointer[i], &Info->Parameters[i]); if (ACPI_FAILURE (Status)) { goto Cleanup; } } Info->Parameters[Info->ParamCount] = NULL; } #ifdef _FUTURE_FEATURE /* * Begin incoming argument count analysis. Check for too few args * and too many args. */ switch (AcpiNsGetType (Info->Node)) { case ACPI_TYPE_METHOD: /* Check incoming argument count against the method definition */ if (Info->ObjDesc->Method.ParamCount > Info->ParamCount) { ACPI_ERROR ((AE_INFO, "Insufficient arguments (%u) - %u are required", Info->ParamCount, Info->ObjDesc->Method.ParamCount)); Status = AE_MISSING_ARGUMENTS; goto Cleanup; } else if (Info->ObjDesc->Method.ParamCount < Info->ParamCount) { ACPI_WARNING ((AE_INFO, "Excess arguments (%u) - only %u are required", Info->ParamCount, Info->ObjDesc->Method.ParamCount)); /* Just pass the required number of arguments */ Info->ParamCount = Info->ObjDesc->Method.ParamCount; } /* * Any incoming external objects to be passed as arguments to the * method must be converted to internal objects */ if (Info->ParamCount) { /* * Allocate a new parameter block for the internal objects * Add 1 to count to allow for null terminated internal list */ Info->Parameters = ACPI_ALLOCATE_ZEROED ( ((ACPI_SIZE) Info->ParamCount + 1) * sizeof (void *)); if (!Info->Parameters) { Status = AE_NO_MEMORY; goto Cleanup; } /* Convert each external object in the list to an internal object */ for (i = 0; i < Info->ParamCount; i++) { Status = AcpiUtCopyEobjectToIobject ( &ExternalParams->Pointer[i], &Info->Parameters[i]); if (ACPI_FAILURE (Status)) { goto Cleanup; } } Info->Parameters[Info->ParamCount] = NULL; } break; default: /* Warn if arguments passed to an object that is not a method */ if (Info->ParamCount) { ACPI_WARNING ((AE_INFO, "%u arguments were passed to a non-method ACPI object", Info->ParamCount)); } break; } #endif /* Now we can evaluate the object */ Status = AcpiNsEvaluate (Info); /* * If we are expecting a return value, and all went well above, * copy the return value to an external object. */ if (!ReturnBuffer) { goto CleanupReturnObject; } if (!Info->ReturnObject) { ReturnBuffer->Length = 0; goto Cleanup; } if (ACPI_GET_DESCRIPTOR_TYPE (Info->ReturnObject) == ACPI_DESC_TYPE_NAMED) { /* * If we received a NS Node as a return object, this means that * the object we are evaluating has nothing interesting to * return (such as a mutex, etc.) We return an error because * these types are essentially unsupported by this interface. * We don't check up front because this makes it easier to add * support for various types at a later date if necessary. */ Status = AE_TYPE; Info->ReturnObject = NULL; /* No need to delete a NS Node */ ReturnBuffer->Length = 0; } if (ACPI_FAILURE (Status)) { goto CleanupReturnObject; } /* Dereference Index and RefOf references */ AcpiNsResolveReferences (Info); /* Get the size of the returned object */ Status = AcpiUtGetObjectSize (Info->ReturnObject, &BufferSpaceNeeded); if (ACPI_SUCCESS (Status)) { /* Validate/Allocate/Clear caller buffer */ Status = AcpiUtInitializeBuffer (ReturnBuffer, BufferSpaceNeeded); if (ACPI_FAILURE (Status)) { /* * Caller's buffer is too small or a new one can't * be allocated */ ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Needed buffer size %X, %s\n", (UINT32) BufferSpaceNeeded, AcpiFormatException (Status))); } else { /* We have enough space for the object, build it */ Status = AcpiUtCopyIobjectToEobject ( Info->ReturnObject, ReturnBuffer); } } CleanupReturnObject: if (Info->ReturnObject) { /* * Delete the internal return object. NOTE: Interpreter must be * locked to avoid race condition. */ AcpiExEnterInterpreter (); /* Remove one reference on the return object (should delete it) */ AcpiUtRemoveReference (Info->ReturnObject); AcpiExExitInterpreter (); } Cleanup: /* Free the input parameter list (if we created one) */ if (Info->Parameters) { /* Free the allocated parameter block */ AcpiUtDeleteInternalObjectList (Info->Parameters); } ACPI_FREE (Info); return_ACPI_STATUS (Status); } ACPI_EXPORT_SYMBOL (AcpiEvaluateObject) /******************************************************************************* * * FUNCTION: AcpiNsResolveReferences * * PARAMETERS: Info - Evaluation info block * * RETURN: Info->ReturnObject is replaced with the dereferenced object * * DESCRIPTION: Dereference certain reference objects. Called before an * internal return object is converted to an external ACPI_OBJECT. * * Performs an automatic dereference of Index and RefOf reference objects. * These reference objects are not supported by the ACPI_OBJECT, so this is a * last resort effort to return something useful. Also, provides compatibility * with other ACPI implementations. * * NOTE: does not handle references within returned package objects or nested * references, but this support could be added later if found to be necessary. * ******************************************************************************/ static void AcpiNsResolveReferences ( ACPI_EVALUATE_INFO *Info) { ACPI_OPERAND_OBJECT *ObjDesc = NULL; ACPI_NAMESPACE_NODE *Node; /* We are interested in reference objects only */ if ((Info->ReturnObject)->Common.Type != ACPI_TYPE_LOCAL_REFERENCE) { return; } /* * Two types of references are supported - those created by Index and * RefOf operators. A name reference (AML_NAMEPATH_OP) can be converted * to an ACPI_OBJECT, so it is not dereferenced here. A DdbHandle * (AML_LOAD_OP) cannot be dereferenced, nor can it be converted to * an ACPI_OBJECT. */ switch (Info->ReturnObject->Reference.Class) { case ACPI_REFCLASS_INDEX: ObjDesc = *(Info->ReturnObject->Reference.Where); break; case ACPI_REFCLASS_REFOF: Node = Info->ReturnObject->Reference.Object; if (Node) { ObjDesc = Node->Object; } break; default: return; } /* Replace the existing reference object */ if (ObjDesc) { AcpiUtAddReference (ObjDesc); AcpiUtRemoveReference (Info->ReturnObject); Info->ReturnObject = ObjDesc; } return; } /******************************************************************************* * * FUNCTION: AcpiWalkNamespace * * PARAMETERS: Type - ACPI_OBJECT_TYPE to search for * StartObject - Handle in namespace where search begins * MaxDepth - Depth to which search is to reach * DescendingCallback - Called during tree descent * when an object of "Type" is found * AscendingCallback - Called during tree ascent * when an object of "Type" is found * Context - Passed to user function(s) above * ReturnValue - Location where return value of * UserFunction is put if terminated early * * RETURNS Return value from the UserFunction if terminated early. * Otherwise, returns NULL. * * DESCRIPTION: Performs a modified depth-first walk of the namespace tree, * starting (and ending) at the object specified by StartHandle. * The callback function is called whenever an object that matches * the type parameter is found. If the callback function returns * a non-zero value, the search is terminated immediately and this * value is returned to the caller. * * The point of this procedure is to provide a generic namespace * walk routine that can be called from multiple places to * provide multiple services; the callback function(s) can be * tailored to each task, whether it is a print function, * a compare function, etc. * ******************************************************************************/ ACPI_STATUS AcpiWalkNamespace ( ACPI_OBJECT_TYPE Type, ACPI_HANDLE StartObject, UINT32 MaxDepth, ACPI_WALK_CALLBACK DescendingCallback, ACPI_WALK_CALLBACK AscendingCallback, void *Context, void **ReturnValue) { ACPI_STATUS Status; ACPI_FUNCTION_TRACE (AcpiWalkNamespace); /* Parameter validation */ if ((Type > ACPI_TYPE_LOCAL_MAX) || (!MaxDepth) || (!DescendingCallback && !AscendingCallback)) { return_ACPI_STATUS (AE_BAD_PARAMETER); } /* * Need to acquire the namespace reader lock to prevent interference * with any concurrent table unloads (which causes the deletion of * namespace objects). We cannot allow the deletion of a namespace node * while the user function is using it. The exception to this are the * nodes created and deleted during control method execution -- these * nodes are marked as temporary nodes and are ignored by the namespace * walk. Thus, control methods can be executed while holding the * namespace deletion lock (and the user function can execute control * methods.) */ Status = AcpiUtAcquireReadLock (&AcpiGbl_NamespaceRwLock); if (ACPI_FAILURE (Status)) { return_ACPI_STATUS (Status); } /* * Lock the namespace around the walk. The namespace will be * unlocked/locked around each call to the user function - since the user * function must be allowed to make ACPICA calls itself (for example, it * will typically execute control methods during device enumeration.) */ Status = AcpiUtAcquireMutex (ACPI_MTX_NAMESPACE); if (ACPI_FAILURE (Status)) { goto UnlockAndExit; } /* Now we can validate the starting node */ if (!AcpiNsValidateHandle (StartObject)) { Status = AE_BAD_PARAMETER; goto UnlockAndExit2; } Status = AcpiNsWalkNamespace (Type, StartObject, MaxDepth, ACPI_NS_WALK_UNLOCK, DescendingCallback, AscendingCallback, Context, ReturnValue); UnlockAndExit2: (void) AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE); UnlockAndExit: (void) AcpiUtReleaseReadLock (&AcpiGbl_NamespaceRwLock); return_ACPI_STATUS (Status); } ACPI_EXPORT_SYMBOL (AcpiWalkNamespace) /******************************************************************************* * * FUNCTION: AcpiNsGetDeviceCallback * * PARAMETERS: Callback from AcpiGetDevice * * RETURN: Status * * DESCRIPTION: Takes callbacks from WalkNamespace and filters out all non- * present devices, or if they specified a HID, it filters based * on that. * ******************************************************************************/ static ACPI_STATUS AcpiNsGetDeviceCallback ( ACPI_HANDLE ObjHandle, UINT32 NestingLevel, void *Context, void **ReturnValue) { ACPI_GET_DEVICES_INFO *Info = Context; ACPI_STATUS Status; ACPI_NAMESPACE_NODE *Node; UINT32 Flags; ACPI_PNP_DEVICE_ID *Hid; ACPI_PNP_DEVICE_ID_LIST *Cid; UINT32 i; BOOLEAN Found; int NoMatch; Status = AcpiUtAcquireMutex (ACPI_MTX_NAMESPACE); if (ACPI_FAILURE (Status)) { return (Status); } Node = AcpiNsValidateHandle (ObjHandle); Status = AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE); if (ACPI_FAILURE (Status)) { return (Status); } if (!Node) { return (AE_BAD_PARAMETER); } /* * First, filter based on the device HID and CID. * * 01/2010: For this case where a specific HID is requested, we don't * want to run _STA until we have an actual HID match. Thus, we will * not unnecessarily execute _STA on devices for which the caller * doesn't care about. Previously, _STA was executed unconditionally * on all devices found here. * * A side-effect of this change is that now we will continue to search * for a matching HID even under device trees where the parent device * would have returned a _STA that indicates it is not present or * not functioning (thus aborting the search on that branch). */ if (Info->Hid != NULL) { Status = AcpiUtExecute_HID (Node, &Hid); if (Status == AE_NOT_FOUND) { return (AE_OK); } else if (ACPI_FAILURE (Status)) { return (AE_CTRL_DEPTH); } NoMatch = strcmp (Hid->String, Info->Hid); ACPI_FREE (Hid); if (NoMatch) { /* * HID does not match, attempt match within the * list of Compatible IDs (CIDs) */ Status = AcpiUtExecute_CID (Node, &Cid); if (Status == AE_NOT_FOUND) { return (AE_OK); } else if (ACPI_FAILURE (Status)) { return (AE_CTRL_DEPTH); } /* Walk the CID list */ Found = FALSE; for (i = 0; i < Cid->Count; i++) { if (strcmp (Cid->Ids[i].String, Info->Hid) == 0) { /* Found a matching CID */ Found = TRUE; break; } } ACPI_FREE (Cid); if (!Found) { return (AE_OK); } } } /* Run _STA to determine if device is present */ Status = AcpiUtExecute_STA (Node, &Flags); if (ACPI_FAILURE (Status)) { return (AE_CTRL_DEPTH); } if (!(Flags & ACPI_STA_DEVICE_PRESENT) && !(Flags & ACPI_STA_DEVICE_FUNCTIONING)) { /* * Don't examine the children of the device only when the * device is neither present nor functional. See ACPI spec, * description of _STA for more information. */ return (AE_CTRL_DEPTH); } /* We have a valid device, invoke the user function */ Status = Info->UserFunction (ObjHandle, NestingLevel, Info->Context, ReturnValue); return (Status); } /******************************************************************************* * * FUNCTION: AcpiGetDevices * * PARAMETERS: HID - HID to search for. Can be NULL. * UserFunction - Called when a matching object is found * Context - Passed to user function * ReturnValue - Location where return value of * UserFunction is put if terminated early * * RETURNS Return value from the UserFunction if terminated early. * Otherwise, returns NULL. * * DESCRIPTION: Performs a modified depth-first walk of the namespace tree, * starting (and ending) at the object specified by StartHandle. * The UserFunction is called whenever an object of type * Device is found. If the user function returns * a non-zero value, the search is terminated immediately and this * value is returned to the caller. * * This is a wrapper for WalkNamespace, but the callback performs * additional filtering. Please see AcpiNsGetDeviceCallback. * ******************************************************************************/ ACPI_STATUS AcpiGetDevices ( char *HID, ACPI_WALK_CALLBACK UserFunction, void *Context, void **ReturnValue) { ACPI_STATUS Status; ACPI_GET_DEVICES_INFO Info; ACPI_FUNCTION_TRACE (AcpiGetDevices); /* Parameter validation */ if (!UserFunction) { return_ACPI_STATUS (AE_BAD_PARAMETER); } /* * We're going to call their callback from OUR callback, so we need * to know what it is, and their context parameter. */ Info.Hid = HID; Info.Context = Context; Info.UserFunction = UserFunction; /* * Lock the namespace around the walk. * The namespace will be unlocked/locked around each call * to the user function - since this function * must be allowed to make Acpi calls itself. */ Status = AcpiUtAcquireMutex (ACPI_MTX_NAMESPACE); if (ACPI_FAILURE (Status)) { return_ACPI_STATUS (Status); } Status = AcpiNsWalkNamespace (ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, ACPI_UINT32_MAX, ACPI_NS_WALK_UNLOCK, AcpiNsGetDeviceCallback, NULL, &Info, ReturnValue); (void) AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE); return_ACPI_STATUS (Status); } ACPI_EXPORT_SYMBOL (AcpiGetDevices) /******************************************************************************* * * FUNCTION: AcpiAttachData * * PARAMETERS: ObjHandle - Namespace node * Handler - Handler for this attachment * Data - Pointer to data to be attached * * RETURN: Status * * DESCRIPTION: Attach arbitrary data and handler to a namespace node. * ******************************************************************************/ ACPI_STATUS AcpiAttachData ( ACPI_HANDLE ObjHandle, ACPI_OBJECT_HANDLER Handler, void *Data) { ACPI_NAMESPACE_NODE *Node; ACPI_STATUS Status; /* Parameter validation */ if (!ObjHandle || !Handler || !Data) { return (AE_BAD_PARAMETER); } Status = AcpiUtAcquireMutex (ACPI_MTX_NAMESPACE); if (ACPI_FAILURE (Status)) { return (Status); } /* Convert and validate the handle */ Node = AcpiNsValidateHandle (ObjHandle); if (!Node) { Status = AE_BAD_PARAMETER; goto UnlockAndExit; } Status = AcpiNsAttachData (Node, Handler, Data); UnlockAndExit: (void) AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE); return (Status); } ACPI_EXPORT_SYMBOL (AcpiAttachData) /******************************************************************************* * * FUNCTION: AcpiDetachData * * PARAMETERS: ObjHandle - Namespace node handle * Handler - Handler used in call to AcpiAttachData * * RETURN: Status * * DESCRIPTION: Remove data that was previously attached to a node. * ******************************************************************************/ ACPI_STATUS AcpiDetachData ( ACPI_HANDLE ObjHandle, ACPI_OBJECT_HANDLER Handler) { ACPI_NAMESPACE_NODE *Node; ACPI_STATUS Status; /* Parameter validation */ if (!ObjHandle || !Handler) { return (AE_BAD_PARAMETER); } Status = AcpiUtAcquireMutex (ACPI_MTX_NAMESPACE); if (ACPI_FAILURE (Status)) { return (Status); } /* Convert and validate the handle */ Node = AcpiNsValidateHandle (ObjHandle); if (!Node) { Status = AE_BAD_PARAMETER; goto UnlockAndExit; } Status = AcpiNsDetachData (Node, Handler); UnlockAndExit: (void) AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE); return (Status); } ACPI_EXPORT_SYMBOL (AcpiDetachData) /******************************************************************************* * * FUNCTION: AcpiGetData * * PARAMETERS: ObjHandle - Namespace node * Handler - Handler used in call to AttachData * Data - Where the data is returned * * RETURN: Status * * DESCRIPTION: Retrieve data that was previously attached to a namespace node. * ******************************************************************************/ ACPI_STATUS AcpiGetData ( ACPI_HANDLE ObjHandle, ACPI_OBJECT_HANDLER Handler, void **Data) { ACPI_NAMESPACE_NODE *Node; ACPI_STATUS Status; /* Parameter validation */ if (!ObjHandle || !Handler || !Data) { return (AE_BAD_PARAMETER); } Status = AcpiUtAcquireMutex (ACPI_MTX_NAMESPACE); if (ACPI_FAILURE (Status)) { return (Status); } /* Convert and validate the handle */ Node = AcpiNsValidateHandle (ObjHandle); if (!Node) { Status = AE_BAD_PARAMETER; goto UnlockAndExit; } Status = AcpiNsGetAttachedData (Node, Handler, Data); UnlockAndExit: (void) AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE); return (Status); } ACPI_EXPORT_SYMBOL (AcpiGetData)
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