Bob Moore | b2deadd | 2009-07-24 10:56:43 +0800 | [diff] [blame^] | 1 | /****************************************************************************** |
| 2 | * |
| 3 | * Module Name: nsrepair - Repair for objects returned by predefined methods |
| 4 | * |
| 5 | *****************************************************************************/ |
| 6 | |
| 7 | /* |
| 8 | * Copyright (C) 2000 - 2009, Intel Corp. |
| 9 | * All rights reserved. |
| 10 | * |
| 11 | * Redistribution and use in source and binary forms, with or without |
| 12 | * modification, are permitted provided that the following conditions |
| 13 | * are met: |
| 14 | * 1. Redistributions of source code must retain the above copyright |
| 15 | * notice, this list of conditions, and the following disclaimer, |
| 16 | * without modification. |
| 17 | * 2. Redistributions in binary form must reproduce at minimum a disclaimer |
| 18 | * substantially similar to the "NO WARRANTY" disclaimer below |
| 19 | * ("Disclaimer") and any redistribution must be conditioned upon |
| 20 | * including a substantially similar Disclaimer requirement for further |
| 21 | * binary redistribution. |
| 22 | * 3. Neither the names of the above-listed copyright holders nor the names |
| 23 | * of any contributors may be used to endorse or promote products derived |
| 24 | * from this software without specific prior written permission. |
| 25 | * |
| 26 | * Alternatively, this software may be distributed under the terms of the |
| 27 | * GNU General Public License ("GPL") version 2 as published by the Free |
| 28 | * Software Foundation. |
| 29 | * |
| 30 | * NO WARRANTY |
| 31 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 32 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 33 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR |
| 34 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| 35 | * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 36 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 37 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 38 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
| 39 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING |
| 40 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| 41 | * POSSIBILITY OF SUCH DAMAGES. |
| 42 | */ |
| 43 | |
| 44 | #include <acpi/acpi.h> |
| 45 | #include "accommon.h" |
| 46 | #include "acnamesp.h" |
| 47 | #include "acpredef.h" |
| 48 | |
| 49 | #define _COMPONENT ACPI_NAMESPACE |
| 50 | ACPI_MODULE_NAME("nsrepair") |
| 51 | |
| 52 | /******************************************************************************* |
| 53 | * |
| 54 | * FUNCTION: acpi_ns_repair_object |
| 55 | * |
| 56 | * PARAMETERS: Data - Pointer to validation data structure |
| 57 | * expected_btypes - Object types expected |
| 58 | * package_index - Index of object within parent package (if |
| 59 | * applicable - ACPI_NOT_PACKAGE_ELEMENT |
| 60 | * otherwise) |
| 61 | * return_object_ptr - Pointer to the object returned from the |
| 62 | * evaluation of a method or object |
| 63 | * |
| 64 | * RETURN: Status. AE_OK if repair was successful. |
| 65 | * |
| 66 | * DESCRIPTION: Attempt to repair/convert a return object of a type that was |
| 67 | * not expected. |
| 68 | * |
| 69 | ******************************************************************************/ |
| 70 | acpi_status |
| 71 | acpi_ns_repair_object(struct acpi_predefined_data *data, |
| 72 | u32 expected_btypes, |
| 73 | u32 package_index, |
| 74 | union acpi_operand_object **return_object_ptr) |
| 75 | { |
| 76 | union acpi_operand_object *return_object = *return_object_ptr; |
| 77 | union acpi_operand_object *new_object; |
| 78 | acpi_size length; |
| 79 | |
| 80 | switch (return_object->common.type) { |
| 81 | case ACPI_TYPE_BUFFER: |
| 82 | |
| 83 | /* Does the method/object legally return a string? */ |
| 84 | |
| 85 | if (!(expected_btypes & ACPI_RTYPE_STRING)) { |
| 86 | return (AE_AML_OPERAND_TYPE); |
| 87 | } |
| 88 | |
| 89 | /* |
| 90 | * Have a Buffer, expected a String, convert. Use a to_string |
| 91 | * conversion, no transform performed on the buffer data. The best |
| 92 | * example of this is the _BIF method, where the string data from |
| 93 | * the battery is often (incorrectly) returned as buffer object(s). |
| 94 | */ |
| 95 | length = 0; |
| 96 | while ((length < return_object->buffer.length) && |
| 97 | (return_object->buffer.pointer[length])) { |
| 98 | length++; |
| 99 | } |
| 100 | |
| 101 | /* Allocate a new string object */ |
| 102 | |
| 103 | new_object = acpi_ut_create_string_object(length); |
| 104 | if (!new_object) { |
| 105 | return (AE_NO_MEMORY); |
| 106 | } |
| 107 | |
| 108 | /* |
| 109 | * Copy the raw buffer data with no transform. String is already NULL |
| 110 | * terminated at Length+1. |
| 111 | */ |
| 112 | ACPI_MEMCPY(new_object->string.pointer, |
| 113 | return_object->buffer.pointer, length); |
| 114 | |
| 115 | /* |
| 116 | * If the original object is a package element, we need to: |
| 117 | * 1. Set the reference count of the new object to match the |
| 118 | * reference count of the old object. |
| 119 | * 2. Decrement the reference count of the original object. |
| 120 | */ |
| 121 | if (package_index != ACPI_NOT_PACKAGE_ELEMENT) { |
| 122 | new_object->common.reference_count = |
| 123 | return_object->common.reference_count; |
| 124 | |
| 125 | if (return_object->common.reference_count > 1) { |
| 126 | return_object->common.reference_count--; |
| 127 | } |
| 128 | |
| 129 | ACPI_WARN_PREDEFINED((AE_INFO, data->pathname, |
| 130 | data->node_flags, |
| 131 | "Converted Buffer to expected String at index %u", |
| 132 | package_index)); |
| 133 | } else { |
| 134 | ACPI_WARN_PREDEFINED((AE_INFO, data->pathname, |
| 135 | data->node_flags, |
| 136 | "Converted Buffer to expected String")); |
| 137 | } |
| 138 | |
| 139 | /* Delete old object, install the new return object */ |
| 140 | |
| 141 | acpi_ut_remove_reference(return_object); |
| 142 | *return_object_ptr = new_object; |
| 143 | data->flags |= ACPI_OBJECT_REPAIRED; |
| 144 | return (AE_OK); |
| 145 | |
| 146 | default: |
| 147 | break; |
| 148 | } |
| 149 | |
| 150 | return (AE_AML_OPERAND_TYPE); |
| 151 | } |