linux-imx

// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0

/******************************************************************************

 *

 * Module Name: pstree - Parser op tree manipulation/traversal/search

 *

 * Copyright (C) 2000 - 2019, Intel Corp.

 *

 *****************************************************************************/

​

#include <acpi/acpi.h>

#include "accommon.h"

#include "acparser.h"

#include "amlcode.h"

#include "acconvert.h"

​

#define _COMPONENT          ACPI_PARSER

ACPI_MODULE_NAME("pstree")

​

/* Local prototypes */

#ifdef ACPI_OBSOLETE_FUNCTIONS

union acpi_parse_object *acpi_ps_get_child(union acpi_parse_object *op);

#endif

​

/*******************************************************************************

 *

 * FUNCTION:    acpi_ps_get_arg

 *

 * PARAMETERS:  op              - Get an argument for this op

 *              argn            - Nth argument to get

 *

 * RETURN:      The argument (as an Op object). NULL if argument does not exist

 *

 * DESCRIPTION: Get the specified op's argument.

 *

 ******************************************************************************/

​

union acpi_parse_object *acpi_ps_get_arg(union acpi_parse_object *op, u32 argn)

{

    union acpi_parse_object *arg = NULL;

    const struct acpi_opcode_info *op_info;

​

    ACPI_FUNCTION_ENTRY();

​

/*

    if (Op->Common.aml_opcode == AML_INT_CONNECTION_OP)

    {

        return (Op->Common.Value.Arg);

    }

*/

    /* Get the info structure for this opcode */

​

    op_info = acpi_ps_get_opcode_info(op->common.aml_opcode);

    if (op_info->class == AML_CLASS_UNKNOWN) {

​

        /* Invalid opcode or ASCII character */

​

        return (NULL);

    }

​

    /* Check if this opcode requires argument sub-objects */

​

    if (!(op_info->flags & AML_HAS_ARGS)) {

​

        /* Has no linked argument objects */

​

        return (NULL);

    }

​

    /* Get the requested argument object */

​

    arg = op->common.value.arg;

    while (arg && argn) {

        argn--;

        arg = arg->common.next;

    }

​

    return (arg);

}

​

/*******************************************************************************

 *

 * FUNCTION:    acpi_ps_append_arg

 *

 * PARAMETERS:  op              - Append an argument to this Op.

 *              arg             - Argument Op to append

 *

 * RETURN:      None.

 *

 * DESCRIPTION: Append an argument to an op's argument list (a NULL arg is OK)

 *

 ******************************************************************************/

​