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Diffstat (limited to 'utilities/utxfmutex.c')
| -rw-r--r-- | utilities/utxfmutex.c | 213 |
1 files changed, 213 insertions, 0 deletions
diff --git a/utilities/utxfmutex.c b/utilities/utxfmutex.c new file mode 100644 index 000000000000..ef962b1874cc --- /dev/null +++ b/utilities/utxfmutex.c @@ -0,0 +1,213 @@ +/******************************************************************************* + * + * Module Name: utxfmutex - external AML mutex access functions + * + ******************************************************************************/ + +/* + * 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 __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); +} |