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Diffstat (limited to 'drivers/acpi/acpica/nsrepair.c')
| -rw-r--r-- | drivers/acpi/acpica/nsrepair.c | 203 |
1 files changed, 203 insertions, 0 deletions
diff --git a/drivers/acpi/acpica/nsrepair.c b/drivers/acpi/acpica/nsrepair.c new file mode 100644 index 00000000000..db2b2a99c3a --- /dev/null +++ b/drivers/acpi/acpica/nsrepair.c @@ -0,0 +1,203 @@ +/****************************************************************************** + * + * Module Name: nsrepair - Repair for objects returned by predefined methods + * + *****************************************************************************/ + +/* + * Copyright (C) 2000 - 2009, 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 "acpredef.h" + +#define _COMPONENT ACPI_NAMESPACE +ACPI_MODULE_NAME("nsrepair") + +/******************************************************************************* + * + * FUNCTION: acpi_ns_repair_object + * + * PARAMETERS: Data - Pointer to validation data structure + * 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_repair_object(struct acpi_predefined_data *data, + 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_size length; + + switch (return_object->common.type) { + case ACPI_TYPE_BUFFER: + + /* Does the method/object legally return a string? */ + + if (!(expected_btypes & ACPI_RTYPE_STRING)) { + return (AE_AML_OPERAND_TYPE); + } + + /* + * Have a Buffer, expected a String, convert. Use a to_string + * conversion, no transform performed on the buffer data. The best + * example of this is the _BIF method, where the string data from + * the battery is often (incorrectly) returned as buffer object(s). + */ + length = 0; + while ((length < return_object->buffer.length) && + (return_object->buffer.pointer[length])) { + length++; + } + + /* Allocate a new string object */ + + new_object = acpi_ut_create_string_object(length); + if (!new_object) { + return (AE_NO_MEMORY); + } + + /* + * Copy the raw buffer data with no transform. String is already NULL + * terminated at Length+1. + */ + ACPI_MEMCPY(new_object->string.pointer, + return_object->buffer.pointer, length); + + /* + * If the original object is a package element, we need to: + * 1. Set the reference count of the new object to match the + * reference count of the old object. + * 2. Decrement the reference count of the original object. + */ + if (package_index != ACPI_NOT_PACKAGE_ELEMENT) { + new_object->common.reference_count = + return_object->common.reference_count; + + if (return_object->common.reference_count > 1) { + return_object->common.reference_count--; + } + + ACPI_WARN_PREDEFINED((AE_INFO, data->pathname, + data->node_flags, + "Converted Buffer to expected String at index %u", + package_index)); + } else { + ACPI_WARN_PREDEFINED((AE_INFO, data->pathname, + data->node_flags, + "Converted Buffer to expected String")); + } + + /* Delete old object, install the new return object */ + + acpi_ut_remove_reference(return_object); + *return_object_ptr = new_object; + data->flags |= ACPI_OBJECT_REPAIRED; + return (AE_OK); + + default: + break; + } + + return (AE_AML_OPERAND_TYPE); +} + +/******************************************************************************* + * + * FUNCTION: acpi_ns_repair_package_list + * + * PARAMETERS: Data - Pointer to validation data structure + * obj_desc_ptr - Pointer to the object to repair. The new + * package object is returned here, + * overwriting the old object. + * + * 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 Packages. If the variable-length + * is one, some BIOS code mistakenly simply declares a single + * Package instead of a Package with one sub-Package. This + * function attempts to repair this error by wrapping a Package + * object around the original Package, creating the correct + * Package with one sub-Package. + * + * Names that can be repaired in this manner include: + * _ALR, _CSD, _HPX, _MLS, _PRT, _PSS, _TRT, TSS + * + ******************************************************************************/ + +acpi_status +acpi_ns_repair_package_list(struct acpi_predefined_data *data, + union acpi_operand_object **obj_desc_ptr) +{ + union acpi_operand_object *pkg_obj_desc; + + /* + * Create the new outer package and populate it. The new package will + * have a single element, the lone subpackage. + */ + pkg_obj_desc = acpi_ut_create_package_object(1); + if (!pkg_obj_desc) { + return (AE_NO_MEMORY); + } + + pkg_obj_desc->package.elements[0] = *obj_desc_ptr; + + /* Return the new object in the object pointer */ + + *obj_desc_ptr = pkg_obj_desc; + data->flags |= ACPI_OBJECT_REPAIRED; + + ACPI_WARN_PREDEFINED((AE_INFO, data->pathname, data->node_flags, + "Incorrectly formed Package, attempting repair")); + + return (AE_OK); +} |