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[linux/fpc-iii.git] / drivers / acpi / acpica / nsrepair.c

/******************************************************************************
 *
 * Module Name: nsrepair - Repair for objects returned by predefined methods
 *
 *****************************************************************************/

/*
 * Copyright (C) 2000 - 2013, 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"
#include "acinterp.h"
#include "acpredef.h"
#include "amlresrc.h"

#define _COMPONENT          ACPI_NAMESPACE
ACPI_MODULE_NAME("nsrepair")

/*******************************************************************************
 *
 * This module attempts to repair or convert objects returned by the
 * predefined methods to an object type that is expected, as per the ACPI
 * specification. The need for this code is dictated by the many machines that
 * return incorrect types for the standard predefined methods. Performing these
 * conversions here, in one place, eliminates the need for individual ACPI
 * device drivers to do the same. Note: Most of these conversions are different
 * than the internal object conversion routines used for implicit object
 * conversion.
 *
 * The following conversions can be performed as necessary:
 *
 * Integer -> String
 * Integer -> Buffer
 * String  -> Integer
 * String  -> Buffer
 * Buffer  -> Integer
 * Buffer  -> String
 * Buffer  -> Package of Integers
 * Package -> Package of one Package
 *
 * Additional conversions that are available:
 *  Convert a null return or zero return value to an end_tag descriptor
 *  Convert an ASCII string to a Unicode buffer
 *
 * An incorrect standalone object is wrapped with required outer package
 *
 * Additional possible repairs:
 * Required package elements that are NULL replaced by Integer/String/Buffer
 *
 ******************************************************************************/
/* Local prototypes */
static const struct acpi_simple_repair_info *acpi_ns_match_simple_repair(struct
                                                                         acpi_namespace_node
                                                                         *node,
                                                                         u32
                                                                         return_btype,
                                                                         u32
                                                                         package_index);

/*
 * Special but simple repairs for some names.
 *
 * 2nd argument: Unexpected types that can be repaired
 */
static const struct acpi_simple_repair_info acpi_object_repair_info[] = {
        /* Resource descriptor conversions */

        {"_CRS",
         ACPI_RTYPE_INTEGER | ACPI_RTYPE_STRING | ACPI_RTYPE_BUFFER |
         ACPI_RTYPE_NONE,
         ACPI_NOT_PACKAGE_ELEMENT,
         acpi_ns_convert_to_resource},
        {"_DMA",
         ACPI_RTYPE_INTEGER | ACPI_RTYPE_STRING | ACPI_RTYPE_BUFFER |
         ACPI_RTYPE_NONE,
         ACPI_NOT_PACKAGE_ELEMENT,
         acpi_ns_convert_to_resource},
        {"_PRS",
         ACPI_RTYPE_INTEGER | ACPI_RTYPE_STRING | ACPI_RTYPE_BUFFER |
         ACPI_RTYPE_NONE,
         ACPI_NOT_PACKAGE_ELEMENT,
         acpi_ns_convert_to_resource},

        /* Unicode conversions */

        {"_MLS", ACPI_RTYPE_STRING, 1,
         acpi_ns_convert_to_unicode},
        {"_STR", ACPI_RTYPE_STRING | ACPI_RTYPE_BUFFER,
         ACPI_NOT_PACKAGE_ELEMENT,
         acpi_ns_convert_to_unicode},
        {{0, 0, 0, 0}, 0, 0, NULL}      /* Table terminator */
};

/*******************************************************************************
 *
 * FUNCTION:    acpi_ns_simple_repair
 *
 * PARAMETERS:  info                - Method execution information block
 *              expected_btypes     - Object types expected
 *              package_index       - Index of object within parent package (if
 *                                    applicable - ACPI_NOT_PACKAGE_ELEMENT
 *                                    otherwise)
 *              return_object_ptr   - Pointer to the object returned from the
 *                                    evaluation of a method or object
 *
 * RETURN:      Status. AE_OK if repair was successful.
 *
 * DESCRIPTION: Attempt to repair/convert a return object of a type that was
 *              not expected.
 *
 ******************************************************************************/

acpi_status
acpi_ns_simple_repair(struct acpi_evaluate_info *info,
                      u32 expected_btypes,
                      u32 package_index,
                      union acpi_operand_object **return_object_ptr)
{
        union acpi_operand_object *return_object = *return_object_ptr;
        union acpi_operand_object *new_object = NULL;
        acpi_status status;
        const struct acpi_simple_repair_info *predefined;

        ACPI_FUNCTION_NAME(ns_simple_repair);

        /*
         * Special repairs for certain names that are in the repair table.
         * Check if this name is in the list of repairable names.
         */
        predefined = acpi_ns_match_simple_repair(info->node,
                                                 info->return_btype,
                                                 package_index);
        if (predefined) {
                if (!return_object) {
                        ACPI_WARN_PREDEFINED((AE_INFO, info->full_pathname,
                                              ACPI_WARN_ALWAYS,
                                              "Missing expected return value"));
                }

                status =
                    predefined->object_converter(return_object, &new_object);
                if (ACPI_FAILURE(status)) {

                        /* A fatal error occurred during a conversion */

                        ACPI_EXCEPTION((AE_INFO, status,
                                        "During return object analysis"));
                        return (status);
                }
                if (new_object) {
                        goto object_repaired;
                }
        }

        /*
         * Do not perform simple object repair unless the return type is not
         * expected.
         */
        if (info->return_btype & expected_btypes) {
                return (AE_OK);
        }

        /*
         * At this point, we know that the type of the returned object was not
         * one of the expected types for this predefined name. Attempt to
         * repair the object by converting it to one of the expected object
         * types for this predefined name.
         */

        /*
         * 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 (expected_btypes && (!(expected_btypes & ACPI_RTYPE_NONE))) {
                        ACPI_WARN_PREDEFINED((AE_INFO, info->full_pathname,
                                              ACPI_WARN_ALWAYS,
                                              "Missing expected return value"));

                        return (AE_AML_NO_RETURN_VALUE);
                }
        }

        if (expected_btypes & ACPI_RTYPE_INTEGER) {
                status = acpi_ns_convert_to_integer(return_object, &new_object);
                if (ACPI_SUCCESS(status)) {
                        goto object_repaired;
                }
        }
        if (expected_btypes & ACPI_RTYPE_STRING) {
                status = acpi_ns_convert_to_string(return_object, &new_object);
                if (ACPI_SUCCESS(status)) {
                        goto object_repaired;
                }
        }
        if (expected_btypes & ACPI_RTYPE_BUFFER) {
                status = acpi_ns_convert_to_buffer(return_object, &new_object);
                if (ACPI_SUCCESS(status)) {
                        goto object_repaired;
                }
        }
        if (expected_btypes & ACPI_RTYPE_PACKAGE) {
                /*
                 * A package is expected. We will wrap the existing object with a
                 * new package object. It is often the case that if a variable-length
                 * package is required, but there is only a single object needed, the
                 * BIOS will return that object instead of wrapping it with a Package
                 * object. Note: after the wrapping, the package will be validated
                 * for correct contents (expected object type or types).
                 */
                status =
                    acpi_ns_wrap_with_package(info, return_object, &new_object);
                if (ACPI_SUCCESS(status)) {
                        /*
                         * The original object just had its reference count
                         * incremented for being inserted into the new package.
                         */
                        *return_object_ptr = new_object;        /* New Package object */
                        info->return_flags |= ACPI_OBJECT_REPAIRED;
                        return (AE_OK);
                }
        }

        /* We cannot repair this object */

        return (AE_AML_OPERAND_TYPE);

object_repaired:

        /* Object was successfully repaired */

        if (package_index != ACPI_NOT_PACKAGE_ELEMENT) {
                /*
                 * The original object is a package element. We need to
                 * decrement the reference count of the original object,
                 * for removing it from the package.
                 *
                 * However, if the original object was just wrapped with a
                 * package object as part of the repair, we don't need to
                 * change the reference count.
                 */
                if (!(info->return_flags & ACPI_OBJECT_WRAPPED)) {
                        new_object->common.reference_count =
                            return_object->common.reference_count;

                        if (return_object->common.reference_count > 1) {
                                return_object->common.reference_count--;
                        }
                }

                ACPI_DEBUG_PRINT((ACPI_DB_REPAIR,
                                  "%s: Converted %s to expected %s at Package index %u\n",
                                  info->full_pathname,
                                  acpi_ut_get_object_type_name(return_object),
                                  acpi_ut_get_object_type_name(new_object),
                                  package_index));
        } else {
                ACPI_DEBUG_PRINT((ACPI_DB_REPAIR,
                                  "%s: Converted %s to expected %s\n",
                                  info->full_pathname,
                                  acpi_ut_get_object_type_name(return_object),
                                  acpi_ut_get_object_type_name(new_object)));
        }

        /* Delete old object, install the new return object */

        acpi_ut_remove_reference(return_object);
        *return_object_ptr = new_object;
        info->return_flags |= ACPI_OBJECT_REPAIRED;
        return (AE_OK);
}

/******************************************************************************
 *
 * FUNCTION:    acpi_ns_match_simple_repair
 *
 * PARAMETERS:  node                - Namespace node for the method/object
 *              return_btype        - Object type that was returned
 *              package_index       - Index of object within parent package (if
 *                                    applicable - ACPI_NOT_PACKAGE_ELEMENT
 *                                    otherwise)
 *
 * RETURN:      Pointer to entry in repair table. NULL indicates not found.
 *
 * DESCRIPTION: Check an object name against the repairable object list.
 *
 *****************************************************************************/

static const struct acpi_simple_repair_info *acpi_ns_match_simple_repair(struct
                                                                         acpi_namespace_node
                                                                         *node,
                                                                         u32
                                                                         return_btype,
                                                                         u32
                                                                         package_index)
{
        const struct acpi_simple_repair_info *this_name;

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

        this_name = acpi_object_repair_info;
        while (this_name->object_converter) {
                if (ACPI_COMPARE_NAME(node->name.ascii, this_name->name)) {

                        /* Check if we can actually repair this name/type combination */

                        if ((return_btype & this_name->unexpected_btypes) &&
                            (package_index == this_name->package_index)) {
                                return (this_name);
                        }

                        return (NULL);
                }
                this_name++;
        }

        return (NULL);          /* Name was not found in the repair table */
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ns_repair_null_element
 *
 * PARAMETERS:  info                - Method execution information block
 *              expected_btypes     - Object types expected
 *              package_index       - Index of object within parent package (if
 *                                    applicable - ACPI_NOT_PACKAGE_ELEMENT
 *                                    otherwise)
 *              return_object_ptr   - Pointer to the object returned from the
 *                                    evaluation of a method or object
 *
 * RETURN:      Status. AE_OK if repair was successful.
 *
 * DESCRIPTION: Attempt to repair a NULL element of a returned Package object.
 *
 ******************************************************************************/

acpi_status
acpi_ns_repair_null_element(struct acpi_evaluate_info * info,
                            u32 expected_btypes,
                            u32 package_index,
                            union acpi_operand_object **return_object_ptr)
{
        union acpi_operand_object *return_object = *return_object_ptr;
        union acpi_operand_object *new_object;

        ACPI_FUNCTION_NAME(ns_repair_null_element);

        /* No repair needed if return object is non-NULL */

        if (return_object) {
                return (AE_OK);
        }

        /*
         * Attempt to repair a NULL element of a Package object. This applies to
         * predefined names that return a fixed-length package and each element
         * is required. It does not apply to variable-length packages where NULL
         * elements are allowed, especially at the end of the package.
         */
        if (expected_btypes & ACPI_RTYPE_INTEGER) {

                /* Need an integer - create a zero-value integer */

                new_object = acpi_ut_create_integer_object((u64)0);
        } else if (expected_btypes & ACPI_RTYPE_STRING) {

                /* Need a string - create a NULL string */

                new_object = acpi_ut_create_string_object(0);
        } else if (expected_btypes & ACPI_RTYPE_BUFFER) {

                /* Need a buffer - create a zero-length buffer */

                new_object = acpi_ut_create_buffer_object(0);
        } else {
                /* Error for all other expected types */

                return (AE_AML_OPERAND_TYPE);
        }

        if (!new_object) {
                return (AE_NO_MEMORY);
        }

        /* Set the reference count according to the parent Package object */

        new_object->common.reference_count =
            info->parent_package->common.reference_count;

        ACPI_DEBUG_PRINT((ACPI_DB_REPAIR,
                          "%s: Converted NULL package element to expected %s at index %u\n",
                          info->full_pathname,
                          acpi_ut_get_object_type_name(new_object),
                          package_index));

        *return_object_ptr = new_object;
        info->return_flags |= ACPI_OBJECT_REPAIRED;
        return (AE_OK);
}

/******************************************************************************
 *
 * FUNCTION:    acpi_ns_remove_null_elements
 *
 * PARAMETERS:  info                - Method execution information block
 *              package_type        - An acpi_return_package_types value
 *              obj_desc            - A Package object
 *
 * RETURN:      None.
 *
 * DESCRIPTION: Remove all NULL package elements from packages that contain
 *              a variable number of sub-packages. For these types of
 *              packages, NULL elements can be safely removed.
 *
 *****************************************************************************/

void
acpi_ns_remove_null_elements(struct acpi_evaluate_info *info,
                             u8 package_type,
                             union acpi_operand_object *obj_desc)
{
        union acpi_operand_object **source;
        union acpi_operand_object **dest;
        u32 count;
        u32 new_count;
        u32 i;

        ACPI_FUNCTION_NAME(ns_remove_null_elements);

        /*
         * We can safely remove all NULL elements from these package types:
         * PTYPE1_VAR packages contain a variable number of simple data types.
         * PTYPE2 packages contain a variable number of sub-packages.
         */
        switch (package_type) {
        case ACPI_PTYPE1_VAR:
        case ACPI_PTYPE2:
        case ACPI_PTYPE2_COUNT:
        case ACPI_PTYPE2_PKG_COUNT:
        case ACPI_PTYPE2_FIXED:
        case ACPI_PTYPE2_MIN:
        case ACPI_PTYPE2_REV_FIXED:
        case ACPI_PTYPE2_FIX_VAR:

                break;

        default:
        case ACPI_PTYPE1_FIXED:
        case ACPI_PTYPE1_OPTION:
                return;
        }

        count = obj_desc->package.count;
        new_count = count;

        source = obj_desc->package.elements;
        dest = source;

        /* Examine all elements of the package object, remove nulls */

        for (i = 0; i < count; i++) {
                if (!*source) {
                        new_count--;
                } else {
                        *dest = *source;
                        dest++;
                }
                source++;
        }

        /* Update parent package if any null elements were removed */

        if (new_count < count) {
                ACPI_DEBUG_PRINT((ACPI_DB_REPAIR,
                                  "%s: Found and removed %u NULL elements\n",
                                  info->full_pathname, (count - new_count)));

                /* NULL terminate list and update the package count */

                *dest = NULL;
                obj_desc->package.count = new_count;
        }
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ns_wrap_with_package
 *
 * PARAMETERS:  info                - Method execution information block
 *              original_object     - Pointer to the object to repair.
 *              obj_desc_ptr        - The new package object is returned here
 *
 * RETURN:      Status, new object in *obj_desc_ptr
 *
 * DESCRIPTION: Repair a common problem with objects that are defined to
 *              return a variable-length Package of sub-objects. If there is
 *              only one sub-object, some BIOS code mistakenly simply declares
 *              the single object instead of a Package with one sub-object.
 *              This function attempts to repair this error by wrapping a
 *              Package object around the original object, creating the
 *              correct and expected Package with one sub-object.
 *
 *              Names that can be repaired in this manner include:
 *              _ALR, _CSD, _HPX, _MLS, _PLD, _PRT, _PSS, _TRT, _TSS,
 *              _BCL, _DOD, _FIX, _Sx
 *
 ******************************************************************************/

acpi_status
acpi_ns_wrap_with_package(struct acpi_evaluate_info *info,
                          union acpi_operand_object *original_object,
                          union acpi_operand_object **obj_desc_ptr)
{
        union acpi_operand_object *pkg_obj_desc;

        ACPI_FUNCTION_NAME(ns_wrap_with_package);

        /*
         * Create the new outer package and populate it. The new package will
         * have a single element, the lone sub-object.
         */
        pkg_obj_desc = acpi_ut_create_package_object(1);
        if (!pkg_obj_desc) {
                return (AE_NO_MEMORY);
        }

        pkg_obj_desc->package.elements[0] = original_object;

        ACPI_DEBUG_PRINT((ACPI_DB_REPAIR,
                          "%s: Wrapped %s with expected Package object\n",
                          info->full_pathname,
                          acpi_ut_get_object_type_name(original_object)));

        /* Return the new object in the object pointer */

        *obj_desc_ptr = pkg_obj_desc;
        info->return_flags |= ACPI_OBJECT_REPAIRED | ACPI_OBJECT_WRAPPED;
        return (AE_OK);
}