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216 lines
6.6 KiB
C
216 lines
6.6 KiB
C
/*******************************************************************************
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*
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* Module Name: utxfmutex - external AML mutex access functions
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*
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******************************************************************************/
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/*
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* Copyright (C) 2000 - 2018, Intel Corp.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions, and the following disclaimer,
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* without modification.
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* 2. Redistributions in binary form must reproduce at minimum a disclaimer
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* substantially similar to the "NO WARRANTY" disclaimer below
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* ("Disclaimer") and any redistribution must be conditioned upon
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* including a substantially similar Disclaimer requirement for further
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* binary redistribution.
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* 3. Neither the names of the above-listed copyright holders nor the names
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* of any contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* Alternatively, this software may be distributed under the terms of the
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* GNU General Public License ("GPL") version 2 as published by the Free
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* Software Foundation.
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*
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* NO WARRANTY
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGES.
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*/
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#include "acpi.h"
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#include "accommon.h"
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#include "acnamesp.h"
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#define _COMPONENT ACPI_UTILITIES
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ACPI_MODULE_NAME ("utxfmutex")
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/* Local prototypes */
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static ACPI_STATUS
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AcpiUtGetMutexObject (
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ACPI_HANDLE Handle,
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ACPI_STRING Pathname,
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ACPI_OPERAND_OBJECT **RetObj);
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/*******************************************************************************
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*
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* FUNCTION: AcpiUtGetMutexObject
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*
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* PARAMETERS: Handle - Mutex or prefix handle (optional)
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* Pathname - Mutex pathname (optional)
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* RetObj - Where the mutex object is returned
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*
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* RETURN: Status
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*
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* DESCRIPTION: Get an AML mutex object. The mutex node is pointed to by
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* Handle:Pathname. Either Handle or Pathname can be NULL, but
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* not both.
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*
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******************************************************************************/
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static ACPI_STATUS
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AcpiUtGetMutexObject (
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ACPI_HANDLE Handle,
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ACPI_STRING Pathname,
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ACPI_OPERAND_OBJECT **RetObj)
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{
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ACPI_NAMESPACE_NODE *MutexNode;
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ACPI_OPERAND_OBJECT *MutexObj;
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ACPI_STATUS Status;
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/* Parameter validation */
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if (!RetObj || (!Handle && !Pathname))
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{
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return (AE_BAD_PARAMETER);
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}
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/* Get a the namespace node for the mutex */
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MutexNode = Handle;
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if (Pathname != NULL)
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{
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Status = AcpiGetHandle (
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Handle, Pathname, ACPI_CAST_PTR (ACPI_HANDLE, &MutexNode));
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if (ACPI_FAILURE (Status))
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{
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return (Status);
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}
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}
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/* Ensure that we actually have a Mutex object */
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if (!MutexNode ||
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(MutexNode->Type != ACPI_TYPE_MUTEX))
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{
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return (AE_TYPE);
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}
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/* Get the low-level mutex object */
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MutexObj = AcpiNsGetAttachedObject (MutexNode);
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if (!MutexObj)
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{
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return (AE_NULL_OBJECT);
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}
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*RetObj = MutexObj;
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return (AE_OK);
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}
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/*******************************************************************************
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*
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* FUNCTION: AcpiAcquireMutex
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*
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* PARAMETERS: Handle - Mutex or prefix handle (optional)
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* Pathname - Mutex pathname (optional)
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* Timeout - Max time to wait for the lock (millisec)
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*
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* RETURN: Status
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*
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* DESCRIPTION: Acquire an AML mutex. This is a device driver interface to
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* AML mutex objects, and allows for transaction locking between
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* drivers and AML code. The mutex node is pointed to by
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* Handle:Pathname. Either Handle or Pathname can be NULL, but
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* not both.
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*
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******************************************************************************/
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ACPI_STATUS
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AcpiAcquireMutex (
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ACPI_HANDLE Handle,
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ACPI_STRING Pathname,
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UINT16 Timeout)
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{
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ACPI_STATUS Status;
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ACPI_OPERAND_OBJECT *MutexObj;
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/* Get the low-level mutex associated with Handle:Pathname */
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Status = AcpiUtGetMutexObject (Handle, Pathname, &MutexObj);
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if (ACPI_FAILURE (Status))
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{
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return (Status);
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}
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/* Acquire the OS mutex */
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Status = AcpiOsAcquireMutex (MutexObj->Mutex.OsMutex, Timeout);
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return (Status);
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}
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ACPI_EXPORT_SYMBOL (AcpiAcquireMutex)
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/*******************************************************************************
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*
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* FUNCTION: AcpiReleaseMutex
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*
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* PARAMETERS: Handle - Mutex or prefix handle (optional)
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* Pathname - Mutex pathname (optional)
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*
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* RETURN: Status
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*
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* DESCRIPTION: Release an AML mutex. This is a device driver interface to
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* AML mutex objects, and allows for transaction locking between
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* drivers and AML code. The mutex node is pointed to by
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* Handle:Pathname. Either Handle or Pathname can be NULL, but
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* not both.
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*
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******************************************************************************/
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ACPI_STATUS
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AcpiReleaseMutex (
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ACPI_HANDLE Handle,
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ACPI_STRING Pathname)
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{
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ACPI_STATUS Status;
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ACPI_OPERAND_OBJECT *MutexObj;
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/* Get the low-level mutex associated with Handle:Pathname */
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Status = AcpiUtGetMutexObject (Handle, Pathname, &MutexObj);
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if (ACPI_FAILURE (Status))
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{
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return (Status);
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}
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/* Release the OS mutex */
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AcpiOsReleaseMutex (MutexObj->Mutex.OsMutex);
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return (AE_OK);
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}
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ACPI_EXPORT_SYMBOL (AcpiReleaseMutex)
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