linux/drivers/acpi/acpica/utxfmutex.c

// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
/*******************************************************************************
 *
 * Module Name: utxfmutex - external AML mutex access functions
 *
 ******************************************************************************/

#include <acpi/acpi.h>
#include "accommon.h"
#include "acnamesp.h"

#define _COMPONENT …
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)
{ … }

/*******************************************************************************
 *
 * 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_EXPORT_SYMBOL(…)

/*******************************************************************************
 *
 * 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_EXPORT_SYMBOL(…)