ACPICA: hide private headers
[linux-2.6.git] / drivers / acpi / acpica / tbfind.c
1 /******************************************************************************
2  *
3  * Module Name: tbfind   - find table
4  *
5  *****************************************************************************/
6
7 /*
8  * Copyright (C) 2000 - 2008, 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 "actables.h"
47
48 #define _COMPONENT          ACPI_TABLES
49 ACPI_MODULE_NAME("tbfind")
50
51 /*******************************************************************************
52  *
53  * FUNCTION:    acpi_tb_find_table
54  *
55  * PARAMETERS:  Signature           - String with ACPI table signature
56  *              oem_id              - String with the table OEM ID
57  *              oem_table_id        - String with the OEM Table ID
58  *              table_index         - Where the table index is returned
59  *
60  * RETURN:      Status and table index
61  *
62  * DESCRIPTION: Find an ACPI table (in the RSDT/XSDT) that matches the
63  *              Signature, OEM ID and OEM Table ID. Returns an index that can
64  *              be used to get the table header or entire table.
65  *
66  ******************************************************************************/
67 acpi_status
68 acpi_tb_find_table(char *signature,
69                    char *oem_id, char *oem_table_id, u32 *table_index)
70 {
71         u32 i;
72         acpi_status status;
73         struct acpi_table_header header;
74
75         ACPI_FUNCTION_TRACE(tb_find_table);
76
77         /* Normalize the input strings */
78
79         ACPI_MEMSET(&header, 0, sizeof(struct acpi_table_header));
80         ACPI_STRNCPY(header.signature, signature, ACPI_NAME_SIZE);
81         ACPI_STRNCPY(header.oem_id, oem_id, ACPI_OEM_ID_SIZE);
82         ACPI_STRNCPY(header.oem_table_id, oem_table_id, ACPI_OEM_TABLE_ID_SIZE);
83
84         /* Search for the table */
85
86         for (i = 0; i < acpi_gbl_root_table_list.count; ++i) {
87                 if (ACPI_MEMCMP(&(acpi_gbl_root_table_list.tables[i].signature),
88                                 header.signature, ACPI_NAME_SIZE)) {
89
90                         /* Not the requested table */
91
92                         continue;
93                 }
94
95                 /* Table with matching signature has been found */
96
97                 if (!acpi_gbl_root_table_list.tables[i].pointer) {
98
99                         /* Table is not currently mapped, map it */
100
101                         status =
102                             acpi_tb_verify_table(&acpi_gbl_root_table_list.
103                                                  tables[i]);
104                         if (ACPI_FAILURE(status)) {
105                                 return_ACPI_STATUS(status);
106                         }
107
108                         if (!acpi_gbl_root_table_list.tables[i].pointer) {
109                                 continue;
110                         }
111                 }
112
113                 /* Check for table match on all IDs */
114
115                 if (!ACPI_MEMCMP
116                     (acpi_gbl_root_table_list.tables[i].pointer->signature,
117                      header.signature, ACPI_NAME_SIZE) && (!oem_id[0]
118                                                            ||
119                                                            !ACPI_MEMCMP
120                                                            (acpi_gbl_root_table_list.
121                                                             tables[i].pointer->
122                                                             oem_id,
123                                                             header.oem_id,
124                                                             ACPI_OEM_ID_SIZE))
125                     && (!oem_table_id[0]
126                         || !ACPI_MEMCMP(acpi_gbl_root_table_list.tables[i].
127                                         pointer->oem_table_id,
128                                         header.oem_table_id,
129                                         ACPI_OEM_TABLE_ID_SIZE))) {
130                         *table_index = i;
131
132                         ACPI_DEBUG_PRINT((ACPI_DB_TABLES,
133                                           "Found table [%4.4s]\n",
134                                           header.signature));
135                         return_ACPI_STATUS(AE_OK);
136                 }
137         }
138
139         return_ACPI_STATUS(AE_NOT_FOUND);
140 }