usb: fix a typo in a comment

[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / acpi / acpica / nspredef.c

/******************************************************************************
 *
 * Module Name: nspredef - Validation of ACPI predefined methods and objects
 *              $Revision: 1.1 $
 *
 *****************************************************************************/

/*
 * 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 ACPI_CREATE_PREDEFINED_TABLE

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

#define _COMPONENT          ACPI_NAMESPACE
ACPI_MODULE_NAME("nspredef")

/*******************************************************************************
 *
 * This module validates predefined ACPI objects that appear in the namespace,
 * at the time they are evaluated (via acpi_evaluate_object). The purpose of this
 * validation is to detect problems with BIOS-exposed predefined ACPI objects
 * before the results are returned to the ACPI-related drivers.
 *
 * There are several areas that are validated:
 *
 *  1) The number of input arguments as defined by the method/object in the
 *      ASL is validated against the ACPI specification.
 *  2) The type of the return object (if any) is validated against the ACPI
 *      specification.
 *  3) For returned package objects, the count of package elements is
 *      validated, as well as the type of each package element. Nested
 *      packages are supported.
 *
 * For any problems found, a warning message is issued.
 *
 ******************************************************************************/
/* Local prototypes */
static acpi_status
acpi_ns_check_package(struct acpi_predefined_data *data,
                      union acpi_operand_object **return_object_ptr);

static acpi_status
acpi_ns_check_package_list(struct acpi_predefined_data *data,
                           const union acpi_predefined_info *package,
                           union acpi_operand_object **elements, u32 count);

static acpi_status
acpi_ns_check_package_elements(struct acpi_predefined_data *data,
                               union acpi_operand_object **elements,
                               u8 type1,
                               u32 count1,
                               u8 type2, u32 count2, u32 start_index);

static acpi_status
acpi_ns_check_object_type(struct acpi_predefined_data *data,
                          union acpi_operand_object **return_object_ptr,
                          u32 expected_btypes, u32 package_index);

static acpi_status
acpi_ns_check_reference(struct acpi_predefined_data *data,
                        union acpi_operand_object *return_object);

static void acpi_ns_get_expected_types(char *buffer, u32 expected_btypes);

/*
 * Names for the types that can be returned by the predefined objects.
 * Used for warning messages. Must be in the same order as the ACPI_RTYPEs
 */
static const char *acpi_rtype_names[] = {
        "/Integer",
        "/String",
        "/Buffer",
        "/Package",
        "/Reference",
};

/*******************************************************************************
 *
 * FUNCTION:    acpi_ns_check_predefined_names
 *
 * PARAMETERS:  Node            - Namespace node for the method/object
 *              user_param_count - Number of parameters actually passed
 *              return_status   - Status from the object evaluation
 *              return_object_ptr - Pointer to the object returned from the
 *                                evaluation of a method or object
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Check an ACPI name for a match in the predefined name list.
 *
 ******************************************************************************/

acpi_status
acpi_ns_check_predefined_names(struct acpi_namespace_node *node,
                               u32 user_param_count,
                               acpi_status return_status,
                               union acpi_operand_object **return_object_ptr)
{
        union acpi_operand_object *return_object = *return_object_ptr;
        acpi_status status = AE_OK;
        const union acpi_predefined_info *predefined;
        char *pathname;
        struct acpi_predefined_data *data;

        /* Match the name for this method/object against the predefined list */

        predefined = acpi_ns_check_for_predefined_name(node);

        /* Get the full pathname to the object, for use in warning messages */

        pathname = acpi_ns_get_external_pathname(node);
        if (!pathname) {
                return AE_OK;   /* Could not get pathname, ignore */
        }

        /*
         * Check that the parameter count for this method matches the ASL
         * definition. For predefined names, ensure that both the caller and
         * the method itself are in accordance with the ACPI specification.
         */
        acpi_ns_check_parameter_count(pathname, node, user_param_count,
                                      predefined);

        /* If not a predefined name, we cannot validate the return object */

        if (!predefined) {
                goto cleanup;
        }

        /*
         * If the method failed or did not actually return an object, we cannot
         * validate the return object
         */
        if ((return_status != AE_OK) && (return_status != AE_CTRL_RETURN_VALUE)) {
                goto cleanup;
        }

        /*
         * If there is no return value, check if we require a return value for
         * this predefined name. Either one return value is expected, or none,
         * for both methods and other objects.
         *
         * Exit now if there is no return object. Warning if one was expected.
         */
        if (!return_object) {
                if ((predefined->info.expected_btypes) &&
                    (!(predefined->info.expected_btypes & ACPI_RTYPE_NONE))) {
                        ACPI_WARN_PREDEFINED((AE_INFO, pathname,
                                              ACPI_WARN_ALWAYS,
                                              "Missing expected return value"));

                        status = AE_AML_NO_RETURN_VALUE;
                }
                goto cleanup;
        }

        /*
         * 1) We have a return value, but if one wasn't expected, just exit, this is
         * not a problem. For example, if the "Implicit Return" feature is
         * enabled, methods will always return a value.
         *
         * 2) If the return value can be of any type, then we cannot perform any
         * validation, exit.
         */
        if ((!predefined->info.expected_btypes) ||
            (predefined->info.expected_btypes == ACPI_RTYPE_ALL)) {
                goto cleanup;
        }

        /* Create the parameter data block for object validation */

        data = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_predefined_data));
        if (!data) {
                goto cleanup;
        }
        data->predefined = predefined;
        data->node_flags = node->flags;
        data->pathname = pathname;

        /*
         * Check that the type of the main return object is what is expected
         * for this predefined name
         */
        status = acpi_ns_check_object_type(data, return_object_ptr,
                                           predefined->info.expected_btypes,
                                           ACPI_NOT_PACKAGE_ELEMENT);
        if (ACPI_FAILURE(status)) {
                goto exit;
        }

        /*
         * For returned Package objects, check the type of all sub-objects.
         * Note: Package may have been newly created by call above.
         */
        if ((*return_object_ptr)->common.type == ACPI_TYPE_PACKAGE) {
                data->parent_package = *return_object_ptr;
                status = acpi_ns_check_package(data, return_object_ptr);
                if (ACPI_FAILURE(status)) {
                        goto exit;
                }
        }

        /*
         * The return object was OK, or it was successfully repaired above.
         * Now make some additional checks such as verifying that package
         * objects are sorted correctly (if required) or buffer objects have
         * the correct data width (bytes vs. dwords). These repairs are
         * performed on a per-name basis, i.e., the code is specific to
         * particular predefined names.
         */
        status = acpi_ns_complex_repairs(data, node, status, return_object_ptr);

exit:
        /*
         * If the object validation failed or if we successfully repaired one
         * or more objects, mark the parent node to suppress further warning
         * messages during the next evaluation of the same method/object.
         */
        if (ACPI_FAILURE(status) || (data->flags & ACPI_OBJECT_REPAIRED)) {
                node->flags |= ANOBJ_EVALUATED;
        }
        ACPI_FREE(data);

cleanup:
        ACPI_FREE(pathname);
        return (status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ns_check_parameter_count
 *
 * PARAMETERS:  Pathname        - Full pathname to the node (for error msgs)
 *              Node            - Namespace node for the method/object
 *              user_param_count - Number of args passed in by the caller
 *              Predefined      - Pointer to entry in predefined name table
 *
 * RETURN:      None
 *
 * DESCRIPTION: Check that the declared (in ASL/AML) parameter count for a
 *              predefined name is what is expected (i.e., what is defined in
 *              the ACPI specification for this predefined name.)
 *
 ******************************************************************************/

void
acpi_ns_check_parameter_count(char *pathname,
                              struct acpi_namespace_node *node,
                              u32 user_param_count,
                              const union acpi_predefined_info *predefined)
{
        u32 param_count;
        u32 required_params_current;
        u32 required_params_old;

        /* Methods have 0-7 parameters. All other types have zero. */

        param_count = 0;
        if (node->type == ACPI_TYPE_METHOD) {
                param_count = node->object->method.param_count;
        }

        if (!predefined) {
                /*
                 * Check the parameter count for non-predefined methods/objects.
                 *
                 * Warning if too few or too many arguments have been passed by the
                 * caller. An incorrect number of arguments may not cause the method
                 * to fail. However, the method will fail if there are too few
                 * arguments and the method attempts to use one of the missing ones.
                 */
                if (user_param_count < param_count) {
                        ACPI_WARN_PREDEFINED((AE_INFO, pathname,
                                              ACPI_WARN_ALWAYS,
                                              "Insufficient arguments - needs %u, found %u",
                                              param_count, user_param_count));
                } else if (user_param_count > param_count) {
                        ACPI_WARN_PREDEFINED((AE_INFO, pathname,
                                              ACPI_WARN_ALWAYS,
                                              "Excess arguments - needs %u, found %u",
                                              param_count, user_param_count));
                }
                return;
        }

        /*
         * Validate the user-supplied parameter count.
         * Allow two different legal argument counts (_SCP, etc.)
         */
        required_params_current = predefined->info.param_count & 0x0F;
        required_params_old = predefined->info.param_count >> 4;

        if (user_param_count != ACPI_UINT32_MAX) {
                if ((user_param_count != required_params_current) &&
                    (user_param_count != required_params_old)) {
                        ACPI_WARN_PREDEFINED((AE_INFO, pathname,
                                              ACPI_WARN_ALWAYS,
                                              "Parameter count mismatch - "
                                              "caller passed %u, ACPI requires %u",
                                              user_param_count,
                                              required_params_current));
                }
        }

        /*
         * Check that the ASL-defined parameter count is what is expected for
         * this predefined name (parameter count as defined by the ACPI
         * specification)
         */
        if ((param_count != required_params_current) &&
            (param_count != required_params_old)) {
                ACPI_WARN_PREDEFINED((AE_INFO, pathname, node->flags,
                                      "Parameter count mismatch - ASL declared %u, ACPI requires %u",
                                      param_count, required_params_current));
        }
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ns_check_for_predefined_name
 *
 * PARAMETERS:  Node            - Namespace node for the method/object
 *
 * RETURN:      Pointer to entry in predefined table. NULL indicates not found.
 *
 * DESCRIPTION: Check an object name against the predefined object list.
 *
 ******************************************************************************/

const union acpi_predefined_info *acpi_ns_check_for_predefined_name(struct
                                                                    acpi_namespace_node
                                                                    *node)
{
        const union acpi_predefined_info *this_name;

        /* Quick check for a predefined name, first character must be underscore */

        if (node->name.ascii[0] != '_') {
                return (NULL);
        }

        /* Search info table for a predefined method/object name */

        this_name = predefined_names;
        while (this_name->info.name[0]) {
                if (ACPI_COMPARE_NAME(node->name.ascii, this_name->info.name)) {
                        return (this_name);
                }

                /*
                 * Skip next entry in the table if this name returns a Package
                 * (next entry contains the package info)
                 */
                if (this_name->info.expected_btypes & ACPI_RTYPE_PACKAGE) {
                        this_name++;
                }

                this_name++;
        }

        return (NULL);          /* Not found */
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ns_check_package
 *
 * PARAMETERS:  Data            - Pointer to validation data structure
 *              return_object_ptr - Pointer to the object returned from the
 *                                evaluation of a method or object
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Check a returned package object for the correct count and
 *              correct type of all sub-objects.
 *
 ******************************************************************************/

static acpi_status
acpi_ns_check_package(struct acpi_predefined_data *data,
                      union acpi_operand_object **return_object_ptr)
{
        union acpi_operand_object *return_object = *return_object_ptr;
        const union acpi_predefined_info *package;
        union acpi_operand_object **elements;
        acpi_status status = AE_OK;
        u32 expected_count;
        u32 count;
        u32 i;

        ACPI_FUNCTION_NAME(ns_check_package);

        /* The package info for this name is in the next table entry */

        package = data->predefined + 1;

        ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
                          "%s Validating return Package of Type %X, Count %X\n",
                          data->pathname, package->ret_info.type,
                          return_object->package.count));

        /*
         * For variable-length Packages, we can safely remove all embedded
         * and trailing NULL package elements
         */
        acpi_ns_remove_null_elements(data, package->ret_info.type,
                                     return_object);

        /* Extract package count and elements array */

        elements = return_object->package.elements;
        count = return_object->package.count;

        /* The package must have at least one element, else invalid */

        if (!count) {
                ACPI_WARN_PREDEFINED((AE_INFO, data->pathname, data->node_flags,
                                      "Return Package has no elements (empty)"));

                return (AE_AML_OPERAND_VALUE);
        }

        /*
         * Decode the type of the expected package contents
         *
         * PTYPE1 packages contain no subpackages
         * PTYPE2 packages contain sub-packages
         */
        switch (package->ret_info.type) {
        case ACPI_PTYPE1_FIXED:

                /*
                 * The package count is fixed and there are no sub-packages
                 *
                 * If package is too small, exit.
                 * If package is larger than expected, issue warning but continue
                 */
                expected_count =
                    package->ret_info.count1 + package->ret_info.count2;
                if (count < expected_count) {
                        goto package_too_small;
                } else if (count > expected_count) {
                        ACPI_DEBUG_PRINT((ACPI_DB_REPAIR,
                                          "%s: Return Package is larger than needed - "
                                          "found %u, expected %u\n",
                                          data->pathname, count,
                                          expected_count));
                }

                /* Validate all elements of the returned package */

                status = acpi_ns_check_package_elements(data, elements,
                                                        package->ret_info.
                                                        object_type1,
                                                        package->ret_info.
                                                        count1,
                                                        package->ret_info.
                                                        object_type2,
                                                        package->ret_info.
                                                        count2, 0);
                break;

        case ACPI_PTYPE1_VAR:

                /*
                 * The package count is variable, there are no sub-packages, and all
                 * elements must be of the same type
                 */
                for (i = 0; i < count; i++) {
                        status = acpi_ns_check_object_type(data, elements,
                                                           package->ret_info.
                                                           object_type1, i);
                        if (ACPI_FAILURE(status)) {
                                return (status);
                        }
                        elements++;
                }
                break;

        case ACPI_PTYPE1_OPTION:

                /*
                 * The package count is variable, there are no sub-packages. There are
                 * a fixed number of required elements, and a variable number of
                 * optional elements.
                 *
                 * Check if package is at least as large as the minimum required
                 */
                expected_count = package->ret_info3.count;
                if (count < expected_count) {
                        goto package_too_small;
                }

                /* Variable number of sub-objects */

                for (i = 0; i < count; i++) {
                        if (i < package->ret_info3.count) {

                                /* These are the required package elements (0, 1, or 2) */

                                status =
                                    acpi_ns_check_object_type(data, elements,
                                                              package->
                                                              ret_info3.
                                                              object_type[i],
                                                              i);
                                if (ACPI_FAILURE(status)) {
                                        return (status);
                                }
                        } else {
                                /* These are the optional package elements */

                                status =
                                    acpi_ns_check_object_type(data, elements,
                                                              package->
                                                              ret_info3.
                                                              tail_object_type,
                                                              i);
                                if (ACPI_FAILURE(status)) {
                                        return (status);
                                }
                        }
                        elements++;
                }
                break;

        case ACPI_PTYPE2_REV_FIXED:

                /* First element is the (Integer) revision */

                status = acpi_ns_check_object_type(data, elements,
                                                   ACPI_RTYPE_INTEGER, 0);
                if (ACPI_FAILURE(status)) {
                        return (status);
                }

                elements++;
                count--;

                /* Examine the sub-packages */

                status =
                    acpi_ns_check_package_list(data, package, elements, count);
                break;

        case ACPI_PTYPE2_PKG_COUNT:

                /* First element is the (Integer) count of sub-packages to follow */

                status = acpi_ns_check_object_type(data, elements,
                                                   ACPI_RTYPE_INTEGER, 0);
                if (ACPI_FAILURE(status)) {
                        return (status);
                }

                /*
                 * Count cannot be larger than the parent package length, but allow it
                 * to be smaller. The >= accounts for the Integer above.
                 */
                expected_count = (u32) (*elements)->integer.value;
                if (expected_count >= count) {
                        goto package_too_small;
                }

                count = expected_count;
                elements++;

                /* Examine the sub-packages */

                status =
                    acpi_ns_check_package_list(data, package, elements, count);
                break;

        case ACPI_PTYPE2:
        case ACPI_PTYPE2_FIXED:
        case ACPI_PTYPE2_MIN:
        case ACPI_PTYPE2_COUNT:

                /*
                 * These types all return a single Package that consists of a
                 * variable number of sub-Packages.
                 *
                 * First, ensure that the first element is a sub-Package. If not,
                 * the BIOS may have incorrectly returned the object as a single
                 * package instead of a Package of Packages (a common error if
                 * there is only one entry). We may be able to repair this by
                 * wrapping the returned Package with a new outer Package.
                 */
                if (*elements
                    && ((*elements)->common.type != ACPI_TYPE_PACKAGE)) {

                        /* Create the new outer package and populate it */

                        status =
                            acpi_ns_repair_package_list(data,
                                                        return_object_ptr);
                        if (ACPI_FAILURE(status)) {
                                return (status);
                        }

                        /* Update locals to point to the new package (of 1 element) */

                        return_object = *return_object_ptr;
                        elements = return_object->package.elements;
                        count = 1;
                }

                /* Examine the sub-packages */

                status =
                    acpi_ns_check_package_list(data, package, elements, count);
                break;

        default:

                /* Should not get here if predefined info table is correct */

                ACPI_WARN_PREDEFINED((AE_INFO, data->pathname, data->node_flags,
                                      "Invalid internal return type in table entry: %X",
                                      package->ret_info.type));

                return (AE_AML_INTERNAL);
        }

        return (status);

package_too_small:

        /* Error exit for the case with an incorrect package count */

        ACPI_WARN_PREDEFINED((AE_INFO, data->pathname, data->node_flags,
                              "Return Package is too small - found %u elements, expected %u",
                              count, expected_count));

        return (AE_AML_OPERAND_VALUE);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ns_check_package_list
 *
 * PARAMETERS:  Data            - Pointer to validation data structure
 *              Package         - Pointer to package-specific info for method
 *              Elements        - Element list of parent package. All elements
 *                                of this list should be of type Package.
 *              Count           - Count of subpackages
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Examine a list of subpackages
 *
 ******************************************************************************/

static acpi_status
acpi_ns_check_package_list(struct acpi_predefined_data *data,
                           const union acpi_predefined_info *package,
                           union acpi_operand_object **elements, u32 count)
{
        union acpi_operand_object *sub_package;
        union acpi_operand_object **sub_elements;
        acpi_status status;
        u32 expected_count;
        u32 i;
        u32 j;

        /*
         * Validate each sub-Package in the parent Package
         *
         * NOTE: assumes list of sub-packages contains no NULL elements.
         * Any NULL elements should have been removed by earlier call
         * to acpi_ns_remove_null_elements.
         */
        for (i = 0; i < count; i++) {
                sub_package = *elements;
                sub_elements = sub_package->package.elements;
                data->parent_package = sub_package;

                /* Each sub-object must be of type Package */

                status = acpi_ns_check_object_type(data, &sub_package,
                                                   ACPI_RTYPE_PACKAGE, i);
                if (ACPI_FAILURE(status)) {
                        return (status);
                }

                /* Examine the different types of expected sub-packages */

                data->parent_package = sub_package;
                switch (package->ret_info.type) {
                case ACPI_PTYPE2:
                case ACPI_PTYPE2_PKG_COUNT:
                case ACPI_PTYPE2_REV_FIXED:

                        /* Each subpackage has a fixed number of elements */

                        expected_count =
                            package->ret_info.count1 + package->ret_info.count2;
                        if (sub_package->package.count < expected_count) {
                                goto package_too_small;
                        }

                        status =
                            acpi_ns_check_package_elements(data, sub_elements,
                                                           package->ret_info.
                                                           object_type1,
                                                           package->ret_info.
                                                           count1,
                                                           package->ret_info.
                                                           object_type2,
                                                           package->ret_info.
                                                           count2, 0);
                        if (ACPI_FAILURE(status)) {
                                return (status);
                        }
                        break;

                case ACPI_PTYPE2_FIXED:

                        /* Each sub-package has a fixed length */

                        expected_count = package->ret_info2.count;
                        if (sub_package->package.count < expected_count) {
                                goto package_too_small;
                        }

                        /* Check the type of each sub-package element */

                        for (j = 0; j < expected_count; j++) {
                                status =
                                    acpi_ns_check_object_type(data,
                                                              &sub_elements[j],
                                                              package->
                                                              ret_info2.
                                                              object_type[j],
                                                              j);
                                if (ACPI_FAILURE(status)) {
                                        return (status);
                                }
                        }
                        break;

                case ACPI_PTYPE2_MIN:

                        /* Each sub-package has a variable but minimum length */

                        expected_count = package->ret_info.count1;
                        if (sub_package->package.count < expected_count) {
                                goto package_too_small;
                        }

                        /* Check the type of each sub-package element */

                        status =
                            acpi_ns_check_package_elements(data, sub_elements,
                                                           package->ret_info.
                                                           object_type1,
                                                           sub_package->package.
                                                           count, 0, 0, 0);
                        if (ACPI_FAILURE(status)) {
                                return (status);
                        }
                        break;

                case ACPI_PTYPE2_COUNT:

                        /*
                         * First element is the (Integer) count of elements, including
                         * the count field (the ACPI name is num_elements)
                         */
                        status = acpi_ns_check_object_type(data, sub_elements,
                                                           ACPI_RTYPE_INTEGER,
                                                           0);
                        if (ACPI_FAILURE(status)) {
                                return (status);
                        }

                        /*
                         * Make sure package is large enough for the Count and is
                         * is as large as the minimum size
                         */
                        expected_count = (u32)(*sub_elements)->integer.value;
                        if (sub_package->package.count < expected_count) {
                                goto package_too_small;
                        }
                        if (sub_package->package.count <
                            package->ret_info.count1) {
                                expected_count = package->ret_info.count1;
                                goto package_too_small;
                        }
                        if (expected_count == 0) {
                                /*
                                 * Either the num_entries element was originally zero or it was
                                 * a NULL element and repaired to an Integer of value zero.
                                 * In either case, repair it by setting num_entries to be the
                                 * actual size of the subpackage.
                                 */
                                expected_count = sub_package->package.count;
                                (*sub_elements)->integer.value = expected_count;
                        }

                        /* Check the type of each sub-package element */

                        status =
                            acpi_ns_check_package_elements(data,
                                                           (sub_elements + 1),
                                                           package->ret_info.
                                                           object_type1,
                                                           (expected_count - 1),
                                                           0, 0, 1);
                        if (ACPI_FAILURE(status)) {
                                return (status);
                        }
                        break;

                default:        /* Should not get here, type was validated by caller */

                        return (AE_AML_INTERNAL);
                }

                elements++;
        }

        return (AE_OK);

package_too_small:

        /* The sub-package count was smaller than required */

        ACPI_WARN_PREDEFINED((AE_INFO, data->pathname, data->node_flags,
                              "Return Sub-Package[%u] is too small - found %u elements, expected %u",
                              i, sub_package->package.count, expected_count));

        return (AE_AML_OPERAND_VALUE);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ns_check_package_elements
 *
 * PARAMETERS:  Data            - Pointer to validation data structure
 *              Elements        - Pointer to the package elements array
 *              Type1           - Object type for first group
 *              Count1          - Count for first group
 *              Type2           - Object type for second group
 *              Count2          - Count for second group
 *              start_index     - Start of the first group of elements
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Check that all elements of a package are of the correct object
 *              type. Supports up to two groups of different object types.
 *
 ******************************************************************************/

static acpi_status
acpi_ns_check_package_elements(struct acpi_predefined_data *data,
                               union acpi_operand_object **elements,
                               u8 type1,
                               u32 count1,
                               u8 type2, u32 count2, u32 start_index)
{
        union acpi_operand_object **this_element = elements;
        acpi_status status;
        u32 i;

        /*
         * Up to two groups of package elements are supported by the data
         * structure. All elements in each group must be of the same type.
         * The second group can have a count of zero.
         */
        for (i = 0; i < count1; i++) {
                status = acpi_ns_check_object_type(data, this_element,
                                                   type1, i + start_index);
                if (ACPI_FAILURE(status)) {
                        return (status);
                }
                this_element++;
        }

        for (i = 0; i < count2; i++) {
                status = acpi_ns_check_object_type(data, this_element,
                                                   type2,
                                                   (i + count1 + start_index));
                if (ACPI_FAILURE(status)) {
                        return (status);
                }
                this_element++;
        }

        return (AE_OK);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ns_check_object_type
 *
 * PARAMETERS:  Data            - Pointer to validation data structure
 *              return_object_ptr - Pointer to the object returned from the
 *                                evaluation of a method or object
 *              expected_btypes - Bitmap of expected return type(s)
 *              package_index   - Index of object within parent package (if
 *                                applicable - ACPI_NOT_PACKAGE_ELEMENT
 *                                otherwise)
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Check the type of the return object against the expected object
 *              type(s). Use of Btype allows multiple expected object types.
 *
 ******************************************************************************/

static acpi_status
acpi_ns_check_object_type(struct acpi_predefined_data *data,
                          union acpi_operand_object **return_object_ptr,
                          u32 expected_btypes, u32 package_index)
{
        union acpi_operand_object *return_object = *return_object_ptr;
        acpi_status status = AE_OK;
        u32 return_btype;
        char type_buffer[48];   /* Room for 5 types */

        /*
         * If we get a NULL return_object here, it is a NULL package element.
         * Since all extraneous NULL package elements were removed earlier by a
         * call to acpi_ns_remove_null_elements, this is an unexpected NULL element.
         * We will attempt to repair it.
         */
        if (!return_object) {
                status = acpi_ns_repair_null_element(data, expected_btypes,
                                                     package_index,
                                                     return_object_ptr);
                if (ACPI_SUCCESS(status)) {
                        return (AE_OK); /* Repair was successful */
                }
                goto type_error_exit;
        }

        /* A Namespace node should not get here, but make sure */

        if (ACPI_GET_DESCRIPTOR_TYPE(return_object) == ACPI_DESC_TYPE_NAMED) {
                ACPI_WARN_PREDEFINED((AE_INFO, data->pathname, data->node_flags,
                                      "Invalid return type - Found a Namespace node [%4.4s] type %s",
                                      return_object->node.name.ascii,
                                      acpi_ut_get_type_name(return_object->node.
                                                            type)));
                return (AE_AML_OPERAND_TYPE);
        }

        /*
         * Convert the object type (ACPI_TYPE_xxx) to a bitmapped object type.
         * The bitmapped type allows multiple possible return types.
         *
         * Note, the cases below must handle all of the possible types returned
         * from all of the predefined names (including elements of returned
         * packages)
         */
        switch (return_object->common.type) {
        case ACPI_TYPE_INTEGER:
                return_btype = ACPI_RTYPE_INTEGER;
                break;

        case ACPI_TYPE_BUFFER:
                return_btype = ACPI_RTYPE_BUFFER;
                break;

        case ACPI_TYPE_STRING:
                return_btype = ACPI_RTYPE_STRING;
                break;

        case ACPI_TYPE_PACKAGE:
                return_btype = ACPI_RTYPE_PACKAGE;
                break;

        case ACPI_TYPE_LOCAL_REFERENCE:
                return_btype = ACPI_RTYPE_REFERENCE;
                break;

        default:
                /* Not one of the supported objects, must be incorrect */

                goto type_error_exit;
        }

        /* Is the object one of the expected types? */

        if (return_btype & expected_btypes) {

                /* For reference objects, check that the reference type is correct */

                if (return_object->common.type == ACPI_TYPE_LOCAL_REFERENCE) {
                        status = acpi_ns_check_reference(data, return_object);
                }

                return (status);
        }

        /* Type mismatch -- attempt repair of the returned object */

        status = acpi_ns_repair_object(data, expected_btypes,
                                       package_index, return_object_ptr);
        if (ACPI_SUCCESS(status)) {
                return (AE_OK); /* Repair was successful */
        }

      type_error_exit:

        /* Create a string with all expected types for this predefined object */

        acpi_ns_get_expected_types(type_buffer, expected_btypes);

        if (package_index == ACPI_NOT_PACKAGE_ELEMENT) {
                ACPI_WARN_PREDEFINED((AE_INFO, data->pathname, data->node_flags,
                                      "Return type mismatch - found %s, expected %s",
                                      acpi_ut_get_object_type_name
                                      (return_object), type_buffer));
        } else {
                ACPI_WARN_PREDEFINED((AE_INFO, data->pathname, data->node_flags,
                                      "Return Package type mismatch at index %u - "
                                      "found %s, expected %s", package_index,
                                      acpi_ut_get_object_type_name
                                      (return_object), type_buffer));
        }

        return (AE_AML_OPERAND_TYPE);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ns_check_reference
 *
 * PARAMETERS:  Data            - Pointer to validation data structure
 *              return_object   - Object returned from the evaluation of a
 *                                method or object
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Check a returned reference object for the correct reference
 *              type. The only reference type that can be returned from a
 *              predefined method is a named reference. All others are invalid.
 *
 ******************************************************************************/

static acpi_status
acpi_ns_check_reference(struct acpi_predefined_data *data,
                        union acpi_operand_object *return_object)
{

        /*
         * Check the reference object for the correct reference type (opcode).
         * The only type of reference that can be converted to an union acpi_object is
         * a reference to a named object (reference class: NAME)
         */
        if (return_object->reference.class == ACPI_REFCLASS_NAME) {
                return (AE_OK);
        }

        ACPI_WARN_PREDEFINED((AE_INFO, data->pathname, data->node_flags,
                              "Return type mismatch - unexpected reference object type [%s] %2.2X",
                              acpi_ut_get_reference_name(return_object),
                              return_object->reference.class));

        return (AE_AML_OPERAND_TYPE);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ns_get_expected_types
 *
 * PARAMETERS:  Buffer          - Pointer to where the string is returned
 *              expected_btypes - Bitmap of expected return type(s)
 *
 * RETURN:      Buffer is populated with type names.
 *
 * DESCRIPTION: Translate the expected types bitmap into a string of ascii
 *              names of expected types, for use in warning messages.
 *
 ******************************************************************************/

static void acpi_ns_get_expected_types(char *buffer, u32 expected_btypes)
{
        u32 this_rtype;
        u32 i;
        u32 j;

        j = 1;
        buffer[0] = 0;
        this_rtype = ACPI_RTYPE_INTEGER;

        for (i = 0; i < ACPI_NUM_RTYPES; i++) {

                /* If one of the expected types, concatenate the name of this type */

                if (expected_btypes & this_rtype) {
                        ACPI_STRCAT(buffer, &acpi_rtype_names[i][j]);
                        j = 0;  /* Use name separator from now on */
                }
                this_rtype <<= 1;       /* Next Rtype */
        }
}