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/*******************************************************************************
*
* Module Name: nsxfeval - Public interfaces to the ACPI subsystem
* ACPI Object evaluation interfaces
*
******************************************************************************/
/*
* Copyright (C) 2000 - 2011, Intel Corp.
* All rights reserved.
*
* 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.
*
* Alternatively, this software may be distributed under the terms of the
* GNU General Public License ("GPL") version 2 as published by the Free
* Software Foundation.
*
* NO WARRANTY
* 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 MERCHANTIBILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDERS OR CONTRIBUTORS BE LIABLE FOR 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 DAMAGES.
*/
#define __NSXFEVAL_C__
#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 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.
* 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 MustFree = FALSE;
ACPI_FUNCTION_TRACE (AcpiEvaluateObjectTyped);
/* Return buffer must be valid */
if (!ReturnBuffer)
{
return_ACPI_STATUS (AE_BAD_PARAMETER);
}
if (ReturnBuffer->Length == ACPI_ALLOCATE_BUFFER)
{
MustFree = TRUE;
}
/* Evaluate the object */
Status = AcpiEvaluateObject (Handle, Pathname, ExternalParams, ReturnBuffer);
if (ACPI_FAILURE (Status))
{
return_ACPI_STATUS (Status);
}
/* Type ANY means "don't care" */
if (ReturnType == ACPI_TYPE_ANY)
{
return_ACPI_STATUS (AE_OK);
}
if (ReturnBuffer->Length == 0)
{
/* Error because caller specifically asked for a return value */
ACPI_ERROR ((AE_INFO, "No return value"));
return_ACPI_STATUS (AE_NULL_OBJECT);
}
/* Examine the object type returned from EvaluateObject */
if (((ACPI_OBJECT *) ReturnBuffer->Pointer)->Type == ReturnType)
{
return_ACPI_STATUS (AE_OK);
}
/* Return object type does not match requested type */
ACPI_ERROR ((AE_INFO,
"Incorrect return type [%s] requested [%s]",
AcpiUtGetTypeName (((ACPI_OBJECT *) ReturnBuffer->Pointer)->Type),
AcpiUtGetTypeName (ReturnType)));
if (MustFree)
{
/* Caller used ACPI_ALLOCATE_BUFFER, free the return buffer */
AcpiOsFree (ReturnBuffer->Pointer);
ReturnBuffer->Pointer = NULL;
}
ReturnBuffer->Length = 0;
return_ACPI_STATUS (AE_TYPE);
}
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);
}
Info->Pathname = Pathname;
/* Convert and validate the device handle */
Info->PrefixNode = AcpiNsValidateHandle (Handle);
if (!Info->PrefixNode)
{
Status = AE_BAD_PARAMETER;
goto Cleanup;
}
/*
* If there are parameters to be passed to a control method, the external
* objects must all be converted to internal objects
*/
if (ExternalParams && ExternalParams->Count)
{
/*
* 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) ExternalParams->Count + 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 < ExternalParams->Count; i++)
{
Status = AcpiUtCopyEobjectToIobject (
&ExternalParams->Pointer[i], &Info->Parameters[i]);
if (ACPI_FAILURE (Status))
{
goto Cleanup;
}
}
Info->Parameters[ExternalParams->Count] = NULL;
}
/*
* Three major cases:
* 1) Fully qualified pathname
* 2) No handle, not fully qualified pathname (error)
* 3) Valid handle
*/
if ((Pathname) &&
(AcpiNsValidRootPrefix (Pathname[0])))
{
/* The path is fully qualified, just evaluate by name */
Info->PrefixNode = NULL;
Status = AcpiNsEvaluate (Info);
}
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;
}
else
{
/* We have a namespace a node and a possible relative path */
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)
{
if (!Info->ReturnObject)
{
ReturnBuffer->Length = 0;
}
else
{
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_SUCCESS (Status))
{
/* 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);
}
}
}
}
}
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
* PreOrderVisit - Called during tree pre-order visit
* when an object of "Type" is found
* PostOrderVisit - Called during tree post-order visit
* 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 PreOrderVisit,
ACPI_WALK_CALLBACK PostOrderVisit,
void *Context,
void **ReturnValue)
{
ACPI_STATUS Status;
ACPI_FUNCTION_TRACE (AcpiWalkNamespace);
/* Parameter validation */
if ((Type > ACPI_TYPE_LOCAL_MAX) ||
(!MaxDepth) ||
(!PreOrderVisit && !PostOrderVisit))
{
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 (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;
}
Status = AcpiNsWalkNamespace (Type, StartObject, MaxDepth,
ACPI_NS_WALK_UNLOCK, PreOrderVisit,
PostOrderVisit, Context, ReturnValue);
(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_DEVICE_ID *Hid;
ACPI_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 = ACPI_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 (ACPI_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)