/******************************************************************************* * * Module Name: utxfmutex - external AML mutex access functions * ******************************************************************************/ /* * Copyright (C) 2000 - 2012, 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. */ #include <acpi/acpi.h> #include "accommon.h" #include "acnamesp.h" #define _COMPONENT ACPI_UTILITIES ACPI_MODULE_NAME("utxfmutex") /* Local prototypes */ static acpi_status acpi_ut_get_mutex_object(acpi_handle handle, acpi_string pathname, union acpi_operand_object **ret_obj); /******************************************************************************* * * FUNCTION: acpi_ut_get_mutex_object * * PARAMETERS: handle - Mutex or prefix handle (optional) * pathname - Mutex pathname (optional) * ret_obj - 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 acpi_ut_get_mutex_object(acpi_handle handle, acpi_string pathname, union acpi_operand_object **ret_obj) { struct acpi_namespace_node *mutex_node; union acpi_operand_object *mutex_obj; acpi_status status; /* Parameter validation */ if (!ret_obj || (!handle && !pathname)) { return (AE_BAD_PARAMETER); } /* Get a the namespace node for the mutex */ mutex_node = handle; if (pathname != NULL) { status = acpi_get_handle(handle, pathname, ACPI_CAST_PTR(acpi_handle, &mutex_node)); if (ACPI_FAILURE(status)) { return (status); } } /* Ensure that we actually have a Mutex object */ if (!mutex_node || (mutex_node->type != ACPI_TYPE_MUTEX)) { return (AE_TYPE); } /* Get the low-level mutex object */ mutex_obj = acpi_ns_get_attached_object(mutex_node); if (!mutex_obj) { return (AE_NULL_OBJECT); } *ret_obj = mutex_obj; return (AE_OK); } /******************************************************************************* * * FUNCTION: acpi_acquire_mutex * * 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 acpi_acquire_mutex(acpi_handle handle, acpi_string pathname, u16 timeout) { acpi_status status; union acpi_operand_object *mutex_obj; /* Get the low-level mutex associated with Handle:Pathname */ status = acpi_ut_get_mutex_object(handle, pathname, &mutex_obj); if (ACPI_FAILURE(status)) { return (status); } /* Acquire the OS mutex */ status = acpi_os_acquire_mutex(mutex_obj->mutex.os_mutex, timeout); return (status); } /******************************************************************************* * * FUNCTION: acpi_release_mutex * * 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 acpi_release_mutex(acpi_handle handle, acpi_string pathname) { acpi_status status; union acpi_operand_object *mutex_obj; /* Get the low-level mutex associated with Handle:Pathname */ status = acpi_ut_get_mutex_object(handle, pathname, &mutex_obj); if (ACPI_FAILURE(status)) { return (status); } /* Release the OS mutex */ acpi_os_release_mutex(mutex_obj->mutex.os_mutex); return (AE_OK); }