Revert "ARM: tegra: tegratab: dummy change"
[linux-2.6.git] / drivers / acpi / acpica / utosi.c
1 /******************************************************************************
2  *
3  * Module Name: utosi - Support for the _OSI predefined control method
4  *
5  *****************************************************************************/
6
7 /*
8  * Copyright (C) 2000 - 2012, 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
47 #define _COMPONENT          ACPI_UTILITIES
48 ACPI_MODULE_NAME("utosi")
49
50 /*
51  * Strings supported by the _OSI predefined control method (which is
52  * implemented internally within this module.)
53  *
54  * March 2009: Removed "Linux" as this host no longer wants to respond true
55  * for this string. Basically, the only safe OS strings are windows-related
56  * and in many or most cases represent the only test path within the
57  * BIOS-provided ASL code.
58  *
59  * The last element of each entry is used to track the newest version of
60  * Windows that the BIOS has requested.
61  */
62 static struct acpi_interface_info acpi_default_supported_interfaces[] = {
63         /* Operating System Vendor Strings */
64
65         {"Windows 2000", NULL, 0, ACPI_OSI_WIN_2000},   /* Windows 2000 */
66         {"Windows 2001", NULL, 0, ACPI_OSI_WIN_XP},     /* Windows XP */
67         {"Windows 2001 SP1", NULL, 0, ACPI_OSI_WIN_XP_SP1},     /* Windows XP SP1 */
68         {"Windows 2001.1", NULL, 0, ACPI_OSI_WINSRV_2003},      /* Windows Server 2003 */
69         {"Windows 2001 SP2", NULL, 0, ACPI_OSI_WIN_XP_SP2},     /* Windows XP SP2 */
70         {"Windows 2001.1 SP1", NULL, 0, ACPI_OSI_WINSRV_2003_SP1},      /* Windows Server 2003 SP1 - Added 03/2006 */
71         {"Windows 2006", NULL, 0, ACPI_OSI_WIN_VISTA},  /* Windows Vista - Added 03/2006 */
72         {"Windows 2006.1", NULL, 0, ACPI_OSI_WINSRV_2008},      /* Windows Server 2008 - Added 09/2009 */
73         {"Windows 2006 SP1", NULL, 0, ACPI_OSI_WIN_VISTA_SP1},  /* Windows Vista SP1 - Added 09/2009 */
74         {"Windows 2006 SP2", NULL, 0, ACPI_OSI_WIN_VISTA_SP2},  /* Windows Vista SP2 - Added 09/2010 */
75         {"Windows 2009", NULL, 0, ACPI_OSI_WIN_7},      /* Windows 7 and Server 2008 R2 - Added 09/2009 */
76
77         /* Feature Group Strings */
78
79         {"Extended Address Space Descriptor", NULL, 0, 0}
80
81         /*
82          * All "optional" feature group strings (features that are implemented
83          * by the host) should be dynamically added by the host via
84          * acpi_install_interface and should not be manually added here.
85          *
86          * Examples of optional feature group strings:
87          *
88          * "Module Device"
89          * "Processor Device"
90          * "3.0 Thermal Model"
91          * "3.0 _SCP Extensions"
92          * "Processor Aggregator Device"
93          */
94 };
95
96 /*******************************************************************************
97  *
98  * FUNCTION:    acpi_ut_initialize_interfaces
99  *
100  * PARAMETERS:  None
101  *
102  * RETURN:      Status
103  *
104  * DESCRIPTION: Initialize the global _OSI supported interfaces list
105  *
106  ******************************************************************************/
107
108 acpi_status acpi_ut_initialize_interfaces(void)
109 {
110         u32 i;
111
112         (void)acpi_os_acquire_mutex(acpi_gbl_osi_mutex, ACPI_WAIT_FOREVER);
113         acpi_gbl_supported_interfaces = acpi_default_supported_interfaces;
114
115         /* Link the static list of supported interfaces */
116
117         for (i = 0;
118              i < (ACPI_ARRAY_LENGTH(acpi_default_supported_interfaces) - 1);
119              i++) {
120                 acpi_default_supported_interfaces[i].next =
121                     &acpi_default_supported_interfaces[(acpi_size) i + 1];
122         }
123
124         acpi_os_release_mutex(acpi_gbl_osi_mutex);
125         return (AE_OK);
126 }
127
128 /*******************************************************************************
129  *
130  * FUNCTION:    acpi_ut_interface_terminate
131  *
132  * PARAMETERS:  None
133  *
134  * RETURN:      None
135  *
136  * DESCRIPTION: Delete all interfaces in the global list. Sets
137  *              acpi_gbl_supported_interfaces to NULL.
138  *
139  ******************************************************************************/
140
141 void acpi_ut_interface_terminate(void)
142 {
143         struct acpi_interface_info *next_interface;
144
145         (void)acpi_os_acquire_mutex(acpi_gbl_osi_mutex, ACPI_WAIT_FOREVER);
146         next_interface = acpi_gbl_supported_interfaces;
147
148         while (next_interface) {
149                 acpi_gbl_supported_interfaces = next_interface->next;
150
151                 /* Only interfaces added at runtime can be freed */
152
153                 if (next_interface->flags & ACPI_OSI_DYNAMIC) {
154                         ACPI_FREE(next_interface->name);
155                         ACPI_FREE(next_interface);
156                 }
157
158                 next_interface = acpi_gbl_supported_interfaces;
159         }
160
161         acpi_os_release_mutex(acpi_gbl_osi_mutex);
162 }
163
164 /*******************************************************************************
165  *
166  * FUNCTION:    acpi_ut_install_interface
167  *
168  * PARAMETERS:  interface_name      - The interface to install
169  *
170  * RETURN:      Status
171  *
172  * DESCRIPTION: Install the interface into the global interface list.
173  *              Caller MUST hold acpi_gbl_osi_mutex
174  *
175  ******************************************************************************/
176
177 acpi_status acpi_ut_install_interface(acpi_string interface_name)
178 {
179         struct acpi_interface_info *interface_info;
180
181         /* Allocate info block and space for the name string */
182
183         interface_info =
184             ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_interface_info));
185         if (!interface_info) {
186                 return (AE_NO_MEMORY);
187         }
188
189         interface_info->name =
190             ACPI_ALLOCATE_ZEROED(ACPI_STRLEN(interface_name) + 1);
191         if (!interface_info->name) {
192                 ACPI_FREE(interface_info);
193                 return (AE_NO_MEMORY);
194         }
195
196         /* Initialize new info and insert at the head of the global list */
197
198         ACPI_STRCPY(interface_info->name, interface_name);
199         interface_info->flags = ACPI_OSI_DYNAMIC;
200         interface_info->next = acpi_gbl_supported_interfaces;
201
202         acpi_gbl_supported_interfaces = interface_info;
203         return (AE_OK);
204 }
205
206 /*******************************************************************************
207  *
208  * FUNCTION:    acpi_ut_remove_interface
209  *
210  * PARAMETERS:  interface_name      - The interface to remove
211  *
212  * RETURN:      Status
213  *
214  * DESCRIPTION: Remove the interface from the global interface list.
215  *              Caller MUST hold acpi_gbl_osi_mutex
216  *
217  ******************************************************************************/
218
219 acpi_status acpi_ut_remove_interface(acpi_string interface_name)
220 {
221         struct acpi_interface_info *previous_interface;
222         struct acpi_interface_info *next_interface;
223
224         previous_interface = next_interface = acpi_gbl_supported_interfaces;
225         while (next_interface) {
226                 if (!ACPI_STRCMP(interface_name, next_interface->name)) {
227
228                         /* Found: name is in either the static list or was added at runtime */
229
230                         if (next_interface->flags & ACPI_OSI_DYNAMIC) {
231
232                                 /* Interface was added dynamically, remove and free it */
233
234                                 if (previous_interface == next_interface) {
235                                         acpi_gbl_supported_interfaces =
236                                             next_interface->next;
237                                 } else {
238                                         previous_interface->next =
239                                             next_interface->next;
240                                 }
241
242                                 ACPI_FREE(next_interface->name);
243                                 ACPI_FREE(next_interface);
244                         } else {
245                                 /*
246                                  * Interface is in static list. If marked invalid, then it
247                                  * does not actually exist. Else, mark it invalid.
248                                  */
249                                 if (next_interface->flags & ACPI_OSI_INVALID) {
250                                         return (AE_NOT_EXIST);
251                                 }
252
253                                 next_interface->flags |= ACPI_OSI_INVALID;
254                         }
255
256                         return (AE_OK);
257                 }
258
259                 previous_interface = next_interface;
260                 next_interface = next_interface->next;
261         }
262
263         /* Interface was not found */
264
265         return (AE_NOT_EXIST);
266 }
267
268 /*******************************************************************************
269  *
270  * FUNCTION:    acpi_ut_get_interface
271  *
272  * PARAMETERS:  interface_name      - The interface to find
273  *
274  * RETURN:      struct acpi_interface_info if found. NULL if not found.
275  *
276  * DESCRIPTION: Search for the specified interface name in the global list.
277  *              Caller MUST hold acpi_gbl_osi_mutex
278  *
279  ******************************************************************************/
280
281 struct acpi_interface_info *acpi_ut_get_interface(acpi_string interface_name)
282 {
283         struct acpi_interface_info *next_interface;
284
285         next_interface = acpi_gbl_supported_interfaces;
286         while (next_interface) {
287                 if (!ACPI_STRCMP(interface_name, next_interface->name)) {
288                         return (next_interface);
289                 }
290
291                 next_interface = next_interface->next;
292         }
293
294         return (NULL);
295 }
296
297 /*******************************************************************************
298  *
299  * FUNCTION:    acpi_ut_osi_implementation
300  *
301  * PARAMETERS:  walk_state          - Current walk state
302  *
303  * RETURN:      Status
304  *
305  * DESCRIPTION: Implementation of the _OSI predefined control method. When
306  *              an invocation of _OSI is encountered in the system AML,
307  *              control is transferred to this function.
308  *
309  ******************************************************************************/
310
311 acpi_status acpi_ut_osi_implementation(struct acpi_walk_state * walk_state)
312 {
313         union acpi_operand_object *string_desc;
314         union acpi_operand_object *return_desc;
315         struct acpi_interface_info *interface_info;
316         acpi_interface_handler interface_handler;
317         u32 return_value;
318
319         ACPI_FUNCTION_TRACE(ut_osi_implementation);
320
321         /* Validate the string input argument (from the AML caller) */
322
323         string_desc = walk_state->arguments[0].object;
324         if (!string_desc || (string_desc->common.type != ACPI_TYPE_STRING)) {
325                 return_ACPI_STATUS(AE_TYPE);
326         }
327
328         /* Create a return object */
329
330         return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
331         if (!return_desc) {
332                 return_ACPI_STATUS(AE_NO_MEMORY);
333         }
334
335         /* Default return value is 0, NOT SUPPORTED */
336
337         return_value = 0;
338         (void)acpi_os_acquire_mutex(acpi_gbl_osi_mutex, ACPI_WAIT_FOREVER);
339
340         /* Lookup the interface in the global _OSI list */
341
342         interface_info = acpi_ut_get_interface(string_desc->string.pointer);
343         if (interface_info && !(interface_info->flags & ACPI_OSI_INVALID)) {
344                 /*
345                  * The interface is supported.
346                  * Update the osi_data if necessary. We keep track of the latest
347                  * version of Windows that has been requested by the BIOS.
348                  */
349                 if (interface_info->value > acpi_gbl_osi_data) {
350                         acpi_gbl_osi_data = interface_info->value;
351                 }
352
353                 return_value = ACPI_UINT32_MAX;
354         }
355
356         acpi_os_release_mutex(acpi_gbl_osi_mutex);
357
358         /*
359          * Invoke an optional _OSI interface handler. The host OS may wish
360          * to do some interface-specific handling. For example, warn about
361          * certain interfaces or override the true/false support value.
362          */
363         interface_handler = acpi_gbl_interface_handler;
364         if (interface_handler) {
365                 return_value =
366                     interface_handler(string_desc->string.pointer,
367                                       return_value);
368         }
369
370         ACPI_DEBUG_PRINT_RAW((ACPI_DB_INFO,
371                               "ACPI: BIOS _OSI(\"%s\") is %ssupported\n",
372                               string_desc->string.pointer,
373                               return_value == 0 ? "not " : ""));
374
375         /* Complete the return object */
376
377         return_desc->integer.value = return_value;
378         walk_state->return_desc = return_desc;
379         return_ACPI_STATUS(AE_OK);
380 }