]> err.no Git - linux-2.6/blob - drivers/acpi/tables/tbfind.c
Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux...
[linux-2.6] / drivers / acpi / tables / tbfind.c
1 /******************************************************************************
2  *
3  * Module Name: tbfind   - find table
4  *
5  *****************************************************************************/
6
7 /*
8  * Copyright (C) 2000 - 2007, R. Byron Moore
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 <acpi/actables.h>
46
47 #define _COMPONENT          ACPI_TABLES
48 ACPI_MODULE_NAME("tbfind")
49
50 /*******************************************************************************
51  *
52  * FUNCTION:    acpi_tb_find_table
53  *
54  * PARAMETERS:  Signature           - String with ACPI table signature
55  *              oem_id              - String with the table OEM ID
56  *              oem_table_id        - String with the OEM Table ID
57  *              table_index         - Where the table index is returned
58  *
59  * RETURN:      Status and table index
60  *
61  * DESCRIPTION: Find an ACPI table (in the RSDT/XSDT) that matches the
62  *              Signature, OEM ID and OEM Table ID. Returns an index that can
63  *              be used to get the table header or entire table.
64  *
65  ******************************************************************************/
66 acpi_status
67 acpi_tb_find_table(char *signature,
68                    char *oem_id,
69                    char *oem_table_id, acpi_native_uint * table_index)
70 {
71         acpi_native_uint i;
72         acpi_status status;
73
74         ACPI_FUNCTION_TRACE(tb_find_table);
75
76         for (i = 0; i < acpi_gbl_root_table_list.count; ++i) {
77                 if (ACPI_MEMCMP(&(acpi_gbl_root_table_list.tables[i].signature),
78                                 signature, ACPI_NAME_SIZE)) {
79
80                         /* Not the requested table */
81
82                         continue;
83                 }
84
85                 /* Table with matching signature has been found */
86
87                 if (!acpi_gbl_root_table_list.tables[i].pointer) {
88
89                         /* Table is not currently mapped, map it */
90
91                         status =
92                             acpi_tb_verify_table(&acpi_gbl_root_table_list.
93                                                  tables[i]);
94                         if (ACPI_FAILURE(status)) {
95                                 return_ACPI_STATUS(status);
96                         }
97
98                         if (!acpi_gbl_root_table_list.tables[i].pointer) {
99                                 continue;
100                         }
101                 }
102
103                 /* Check for table match on all IDs */
104
105                 if (!ACPI_MEMCMP
106                     (acpi_gbl_root_table_list.tables[i].pointer->signature,
107                      signature, ACPI_NAME_SIZE) && (!oem_id[0]
108                                                     ||
109                                                     !ACPI_MEMCMP
110                                                     (acpi_gbl_root_table_list.
111                                                      tables[i].pointer->oem_id,
112                                                      oem_id, ACPI_OEM_ID_SIZE))
113                     && (!oem_table_id[0]
114                         || !ACPI_MEMCMP(acpi_gbl_root_table_list.tables[i].
115                                         pointer->oem_table_id, oem_table_id,
116                                         ACPI_OEM_TABLE_ID_SIZE))) {
117                         *table_index = i;
118
119                         ACPI_DEBUG_PRINT((ACPI_DB_TABLES,
120                                           "Found table [%4.4s]\n", signature));
121                         return_ACPI_STATUS(AE_OK);
122                 }
123         }
124
125         return_ACPI_STATUS(AE_NOT_FOUND);
126 }