/*******************************************************************************
 *
 * Module Name: utxfmutex - external AML mutex access functions
 *
 ******************************************************************************/

/******************************************************************************
 *
 * 1. Copyright Notice
 *
 * Some or all of this work - Copyright (c) 1999 - 2012, 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.
 *
 *****************************************************************************/

#define __UTXFMUTEX_C__

#include "acpi.h"
#include "accommon.h"
#include "acnamesp.h"


#define _COMPONENT          ACPI_UTILITIES
        ACPI_MODULE_NAME    ("utxfmutex")


/* Local prototypes */

static ACPI_STATUS
AcpiUtGetMutexObject (
    ACPI_HANDLE             Handle,
    ACPI_STRING             Pathname,
    ACPI_OPERAND_OBJECT     **RetObj);


/*******************************************************************************
 *
 * FUNCTION:    AcpiUtGetMutexObject
 *
 * PARAMETERS:  Handle              - Mutex or prefix handle (optional)
 *              Pathname            - Mutex pathname (optional)
 *              RetObj              - Where the mutex object is returned
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Get an AML mutex object. The mutex node is pointed to by
 *              Handle:Pathname. Either Handle or Pathname can be NULL, but
 *              not both.
 *
 ******************************************************************************/

static ACPI_STATUS
AcpiUtGetMutexObject (
    ACPI_HANDLE             Handle,
    ACPI_STRING             Pathname,
    ACPI_OPERAND_OBJECT     **RetObj)
{
    ACPI_NAMESPACE_NODE     *MutexNode;
    ACPI_OPERAND_OBJECT     *MutexObj;
    ACPI_STATUS             Status;


    /* Parameter validation */

    if (!RetObj || (!Handle && !Pathname))
    {
        return (AE_BAD_PARAMETER);
    }

    /* Get a the namespace node for the mutex */

    MutexNode = Handle;
    if (Pathname != NULL)
    {
        Status = AcpiGetHandle (Handle, Pathname,
            ACPI_CAST_PTR (ACPI_HANDLE, &MutexNode));
        if (ACPI_FAILURE (Status))
        {
            return (Status);
        }
    }

    /* Ensure that we actually have a Mutex object */

    if (!MutexNode ||
        (MutexNode->Type != ACPI_TYPE_MUTEX))
    {
        return (AE_TYPE);
    }

    /* Get the low-level mutex object */

    MutexObj = AcpiNsGetAttachedObject (MutexNode);
    if (!MutexObj)
    {
        return (AE_NULL_OBJECT);
    }

    *RetObj = MutexObj;
    return (AE_OK);
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiAcquireMutex
 *
 * PARAMETERS:  Handle              - Mutex or prefix handle (optional)
 *              Pathname            - Mutex pathname (optional)
 *              Timeout             - Max time to wait for the lock (millisec)
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Acquire an AML mutex. This is a device driver interface to
 *              AML mutex objects, and allows for transaction locking between
 *              drivers and AML code. The mutex node is pointed to by
 *              Handle:Pathname. Either Handle or Pathname can be NULL, but
 *              not both.
 *
 ******************************************************************************/

ACPI_STATUS
AcpiAcquireMutex (
    ACPI_HANDLE             Handle,
    ACPI_STRING             Pathname,
    UINT16                  Timeout)
{
    ACPI_STATUS             Status;
    ACPI_OPERAND_OBJECT     *MutexObj;


    /* Get the low-level mutex associated with Handle:Pathname */

    Status = AcpiUtGetMutexObject (Handle, Pathname, &MutexObj);
    if (ACPI_FAILURE (Status))
    {
        return (Status);
    }

    /* Acquire the OS mutex */

    Status = AcpiOsAcquireMutex (MutexObj->Mutex.OsMutex, Timeout);
    return (Status);
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiReleaseMutex
 *
 * PARAMETERS:  Handle              - Mutex or prefix handle (optional)
 *              Pathname            - Mutex pathname (optional)
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Release an AML mutex. This is a device driver interface to
 *              AML mutex objects, and allows for transaction locking between
 *              drivers and AML code. The mutex node is pointed to by
 *              Handle:Pathname. Either Handle or Pathname can be NULL, but
 *              not both.
 *
 ******************************************************************************/

ACPI_STATUS
AcpiReleaseMutex (
    ACPI_HANDLE             Handle,
    ACPI_STRING             Pathname)
{
    ACPI_STATUS             Status;
    ACPI_OPERAND_OBJECT     *MutexObj;


    /* Get the low-level mutex associated with Handle:Pathname */

    Status = AcpiUtGetMutexObject (Handle, Pathname, &MutexObj);
    if (ACPI_FAILURE (Status))
    {
        return (Status);
    }

    /* Release the OS mutex */

    AcpiOsReleaseMutex (MutexObj->Mutex.OsMutex);
    return (AE_OK);
}
