Merge branch 'battery' into release
[linux-2.6] / drivers / acpi / acpica / nsxfeval.c
1 /*******************************************************************************
2  *
3  * Module Name: nsxfeval - Public interfaces to the ACPI subsystem
4  *                         ACPI Object evaluation interfaces
5  *
6  ******************************************************************************/
7
8 /*
9  * Copyright (C) 2000 - 2008, Intel Corp.
10  * All rights reserved.
11  *
12  * Redistribution and use in source and binary forms, with or without
13  * modification, are permitted provided that the following conditions
14  * are met:
15  * 1. Redistributions of source code must retain the above copyright
16  *    notice, this list of conditions, and the following disclaimer,
17  *    without modification.
18  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
19  *    substantially similar to the "NO WARRANTY" disclaimer below
20  *    ("Disclaimer") and any redistribution must be conditioned upon
21  *    including a substantially similar Disclaimer requirement for further
22  *    binary redistribution.
23  * 3. Neither the names of the above-listed copyright holders nor the names
24  *    of any contributors may be used to endorse or promote products derived
25  *    from this software without specific prior written permission.
26  *
27  * Alternatively, this software may be distributed under the terms of the
28  * GNU General Public License ("GPL") version 2 as published by the Free
29  * Software Foundation.
30  *
31  * NO WARRANTY
32  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
33  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
34  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
35  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
36  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
37  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
38  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
39  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
40  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
41  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
42  * POSSIBILITY OF SUCH DAMAGES.
43  */
44
45 #include <acpi/acpi.h>
46 #include "accommon.h"
47 #include "acnamesp.h"
48 #include "acinterp.h"
49
50 #define _COMPONENT          ACPI_NAMESPACE
51 ACPI_MODULE_NAME("nsxfeval")
52
53 /* Local prototypes */
54 static void acpi_ns_resolve_references(struct acpi_evaluate_info *info);
55
56 #ifdef ACPI_FUTURE_USAGE
57 /*******************************************************************************
58  *
59  * FUNCTION:    acpi_evaluate_object_typed
60  *
61  * PARAMETERS:  Handle              - Object handle (optional)
62  *              Pathname            - Object pathname (optional)
63  *              external_params     - List of parameters to pass to method,
64  *                                    terminated by NULL.  May be NULL
65  *                                    if no parameters are being passed.
66  *              return_buffer       - Where to put method's return value (if
67  *                                    any).  If NULL, no value is returned.
68  *              return_type         - Expected type of return object
69  *
70  * RETURN:      Status
71  *
72  * DESCRIPTION: Find and evaluate the given object, passing the given
73  *              parameters if necessary.  One of "Handle" or "Pathname" must
74  *              be valid (non-null)
75  *
76  ******************************************************************************/
77
78 acpi_status
79 acpi_evaluate_object_typed(acpi_handle handle,
80                            acpi_string pathname,
81                            struct acpi_object_list *external_params,
82                            struct acpi_buffer *return_buffer,
83                            acpi_object_type return_type)
84 {
85         acpi_status status;
86         u8 must_free = FALSE;
87
88         ACPI_FUNCTION_TRACE(acpi_evaluate_object_typed);
89
90         /* Return buffer must be valid */
91
92         if (!return_buffer) {
93                 return_ACPI_STATUS(AE_BAD_PARAMETER);
94         }
95
96         if (return_buffer->length == ACPI_ALLOCATE_BUFFER) {
97                 must_free = TRUE;
98         }
99
100         /* Evaluate the object */
101
102         status =
103             acpi_evaluate_object(handle, pathname, external_params,
104                                  return_buffer);
105         if (ACPI_FAILURE(status)) {
106                 return_ACPI_STATUS(status);
107         }
108
109         /* Type ANY means "don't care" */
110
111         if (return_type == ACPI_TYPE_ANY) {
112                 return_ACPI_STATUS(AE_OK);
113         }
114
115         if (return_buffer->length == 0) {
116
117                 /* Error because caller specifically asked for a return value */
118
119                 ACPI_ERROR((AE_INFO, "No return value"));
120                 return_ACPI_STATUS(AE_NULL_OBJECT);
121         }
122
123         /* Examine the object type returned from evaluate_object */
124
125         if (((union acpi_object *)return_buffer->pointer)->type == return_type) {
126                 return_ACPI_STATUS(AE_OK);
127         }
128
129         /* Return object type does not match requested type */
130
131         ACPI_ERROR((AE_INFO,
132                     "Incorrect return type [%s] requested [%s]",
133                     acpi_ut_get_type_name(((union acpi_object *)return_buffer->
134                                            pointer)->type),
135                     acpi_ut_get_type_name(return_type)));
136
137         if (must_free) {
138
139                 /* Caller used ACPI_ALLOCATE_BUFFER, free the return buffer */
140
141                 ACPI_FREE(return_buffer->pointer);
142                 return_buffer->pointer = NULL;
143         }
144
145         return_buffer->length = 0;
146         return_ACPI_STATUS(AE_TYPE);
147 }
148
149 ACPI_EXPORT_SYMBOL(acpi_evaluate_object_typed)
150 #endif                          /*  ACPI_FUTURE_USAGE  */
151 /*******************************************************************************
152  *
153  * FUNCTION:    acpi_evaluate_object
154  *
155  * PARAMETERS:  Handle              - Object handle (optional)
156  *              Pathname            - Object pathname (optional)
157  *              external_params     - List of parameters to pass to method,
158  *                                    terminated by NULL.  May be NULL
159  *                                    if no parameters are being passed.
160  *              return_buffer       - Where to put method's return value (if
161  *                                    any).  If NULL, no value is returned.
162  *
163  * RETURN:      Status
164  *
165  * DESCRIPTION: Find and evaluate the given object, passing the given
166  *              parameters if necessary.  One of "Handle" or "Pathname" must
167  *              be valid (non-null)
168  *
169  ******************************************************************************/
170 acpi_status
171 acpi_evaluate_object(acpi_handle handle,
172                      acpi_string pathname,
173                      struct acpi_object_list *external_params,
174                      struct acpi_buffer *return_buffer)
175 {
176         acpi_status status;
177         struct acpi_evaluate_info *info;
178         acpi_size buffer_space_needed;
179         u32 i;
180
181         ACPI_FUNCTION_TRACE(acpi_evaluate_object);
182
183         /* Allocate and initialize the evaluation information block */
184
185         info = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info));
186         if (!info) {
187                 return_ACPI_STATUS(AE_NO_MEMORY);
188         }
189
190         info->pathname = pathname;
191
192         /* Convert and validate the device handle */
193
194         info->prefix_node = acpi_ns_map_handle_to_node(handle);
195         if (!info->prefix_node) {
196                 status = AE_BAD_PARAMETER;
197                 goto cleanup;
198         }
199
200         /*
201          * If there are parameters to be passed to a control method, the external
202          * objects must all be converted to internal objects
203          */
204         if (external_params && external_params->count) {
205                 /*
206                  * Allocate a new parameter block for the internal objects
207                  * Add 1 to count to allow for null terminated internal list
208                  */
209                 info->parameters = ACPI_ALLOCATE_ZEROED(((acpi_size)
210                                                          external_params->
211                                                          count +
212                                                          1) * sizeof(void *));
213                 if (!info->parameters) {
214                         status = AE_NO_MEMORY;
215                         goto cleanup;
216                 }
217
218                 /* Convert each external object in the list to an internal object */
219
220                 for (i = 0; i < external_params->count; i++) {
221                         status =
222                             acpi_ut_copy_eobject_to_iobject(&external_params->
223                                                             pointer[i],
224                                                             &info->
225                                                             parameters[i]);
226                         if (ACPI_FAILURE(status)) {
227                                 goto cleanup;
228                         }
229                 }
230                 info->parameters[external_params->count] = NULL;
231         }
232
233         /*
234          * Three major cases:
235          * 1) Fully qualified pathname
236          * 2) No handle, not fully qualified pathname (error)
237          * 3) Valid handle
238          */
239         if ((pathname) && (acpi_ns_valid_root_prefix(pathname[0]))) {
240
241                 /* The path is fully qualified, just evaluate by name */
242
243                 info->prefix_node = NULL;
244                 status = acpi_ns_evaluate(info);
245         } else if (!handle) {
246                 /*
247                  * A handle is optional iff a fully qualified pathname is specified.
248                  * Since we've already handled fully qualified names above, this is
249                  * an error
250                  */
251                 if (!pathname) {
252                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
253                                           "Both Handle and Pathname are NULL"));
254                 } else {
255                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
256                                           "Null Handle with relative pathname [%s]",
257                                           pathname));
258                 }
259
260                 status = AE_BAD_PARAMETER;
261         } else {
262                 /* We have a namespace a node and a possible relative path */
263
264                 status = acpi_ns_evaluate(info);
265         }
266
267         /*
268          * If we are expecting a return value, and all went well above,
269          * copy the return value to an external object.
270          */
271         if (return_buffer) {
272                 if (!info->return_object) {
273                         return_buffer->length = 0;
274                 } else {
275                         if (ACPI_GET_DESCRIPTOR_TYPE(info->return_object) ==
276                             ACPI_DESC_TYPE_NAMED) {
277                                 /*
278                                  * If we received a NS Node as a return object, this means that
279                                  * the object we are evaluating has nothing interesting to
280                                  * return (such as a mutex, etc.)  We return an error because
281                                  * these types are essentially unsupported by this interface.
282                                  * We don't check up front because this makes it easier to add
283                                  * support for various types at a later date if necessary.
284                                  */
285                                 status = AE_TYPE;
286                                 info->return_object = NULL;     /* No need to delete a NS Node */
287                                 return_buffer->length = 0;
288                         }
289
290                         if (ACPI_SUCCESS(status)) {
291
292                                 /* Dereference Index and ref_of references */
293
294                                 acpi_ns_resolve_references(info);
295
296                                 /* Get the size of the returned object */
297
298                                 status =
299                                     acpi_ut_get_object_size(info->return_object,
300                                                             &buffer_space_needed);
301                                 if (ACPI_SUCCESS(status)) {
302
303                                         /* Validate/Allocate/Clear caller buffer */
304
305                                         status =
306                                             acpi_ut_initialize_buffer
307                                             (return_buffer,
308                                              buffer_space_needed);
309                                         if (ACPI_FAILURE(status)) {
310                                                 /*
311                                                  * Caller's buffer is too small or a new one can't
312                                                  * be allocated
313                                                  */
314                                                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
315                                                                   "Needed buffer size %X, %s\n",
316                                                                   (u32)
317                                                                   buffer_space_needed,
318                                                                   acpi_format_exception
319                                                                   (status)));
320                                         } else {
321                                                 /* We have enough space for the object, build it */
322
323                                                 status =
324                                                     acpi_ut_copy_iobject_to_eobject
325                                                     (info->return_object,
326                                                      return_buffer);
327                                         }
328                                 }
329                         }
330                 }
331         }
332
333         if (info->return_object) {
334                 /*
335                  * Delete the internal return object. NOTE: Interpreter must be
336                  * locked to avoid race condition.
337                  */
338                 acpi_ex_enter_interpreter();
339
340                 /* Remove one reference on the return object (should delete it) */
341
342                 acpi_ut_remove_reference(info->return_object);
343                 acpi_ex_exit_interpreter();
344         }
345
346       cleanup:
347
348         /* Free the input parameter list (if we created one) */
349
350         if (info->parameters) {
351
352                 /* Free the allocated parameter block */
353
354                 acpi_ut_delete_internal_object_list(info->parameters);
355         }
356
357         ACPI_FREE(info);
358         return_ACPI_STATUS(status);
359 }
360
361 ACPI_EXPORT_SYMBOL(acpi_evaluate_object)
362
363 /*******************************************************************************
364  *
365  * FUNCTION:    acpi_ns_resolve_references
366  *
367  * PARAMETERS:  Info                    - Evaluation info block
368  *
369  * RETURN:      Info->return_object is replaced with the dereferenced object
370  *
371  * DESCRIPTION: Dereference certain reference objects. Called before an
372  *              internal return object is converted to an external union acpi_object.
373  *
374  * Performs an automatic dereference of Index and ref_of reference objects.
375  * These reference objects are not supported by the union acpi_object, so this is a
376  * last resort effort to return something useful. Also, provides compatibility
377  * with other ACPI implementations.
378  *
379  * NOTE: does not handle references within returned package objects or nested
380  * references, but this support could be added later if found to be necessary.
381  *
382  ******************************************************************************/
383 static void acpi_ns_resolve_references(struct acpi_evaluate_info *info)
384 {
385         union acpi_operand_object *obj_desc = NULL;
386         struct acpi_namespace_node *node;
387
388         /* We are interested in reference objects only */
389
390         if (ACPI_GET_OBJECT_TYPE(info->return_object) !=
391             ACPI_TYPE_LOCAL_REFERENCE) {
392                 return;
393         }
394
395         /*
396          * Two types of references are supported - those created by Index and
397          * ref_of operators. A name reference (AML_NAMEPATH_OP) can be converted
398          * to an union acpi_object, so it is not dereferenced here. A ddb_handle
399          * (AML_LOAD_OP) cannot be dereferenced, nor can it be converted to
400          * an union acpi_object.
401          */
402         switch (info->return_object->reference.class) {
403         case ACPI_REFCLASS_INDEX:
404
405                 obj_desc = *(info->return_object->reference.where);
406                 break;
407
408         case ACPI_REFCLASS_REFOF:
409
410                 node = info->return_object->reference.object;
411                 if (node) {
412                         obj_desc = node->object;
413                 }
414                 break;
415
416         default:
417                 return;
418         }
419
420         /* Replace the existing reference object */
421
422         if (obj_desc) {
423                 acpi_ut_add_reference(obj_desc);
424                 acpi_ut_remove_reference(info->return_object);
425                 info->return_object = obj_desc;
426         }
427
428         return;
429 }
430
431 /*******************************************************************************
432  *
433  * FUNCTION:    acpi_walk_namespace
434  *
435  * PARAMETERS:  Type                - acpi_object_type to search for
436  *              start_object        - Handle in namespace where search begins
437  *              max_depth           - Depth to which search is to reach
438  *              user_function       - Called when an object of "Type" is found
439  *              Context             - Passed to user function
440  *              return_value        - Location where return value of
441  *                                    user_function is put if terminated early
442  *
443  * RETURNS      Return value from the user_function if terminated early.
444  *              Otherwise, returns NULL.
445  *
446  * DESCRIPTION: Performs a modified depth-first walk of the namespace tree,
447  *              starting (and ending) at the object specified by start_handle.
448  *              The user_function is called whenever an object that matches
449  *              the type parameter is found.  If the user function returns
450  *              a non-zero value, the search is terminated immediately and this
451  *              value is returned to the caller.
452  *
453  *              The point of this procedure is to provide a generic namespace
454  *              walk routine that can be called from multiple places to
455  *              provide multiple services;  the User Function can be tailored
456  *              to each task, whether it is a print function, a compare
457  *              function, etc.
458  *
459  ******************************************************************************/
460
461 acpi_status
462 acpi_walk_namespace(acpi_object_type type,
463                     acpi_handle start_object,
464                     u32 max_depth,
465                     acpi_walk_callback user_function,
466                     void *context, void **return_value)
467 {
468         acpi_status status;
469
470         ACPI_FUNCTION_TRACE(acpi_walk_namespace);
471
472         /* Parameter validation */
473
474         if ((type > ACPI_TYPE_LOCAL_MAX) || (!max_depth) || (!user_function)) {
475                 return_ACPI_STATUS(AE_BAD_PARAMETER);
476         }
477
478         /*
479          * Lock the namespace around the walk.
480          * The namespace will be unlocked/locked around each call
481          * to the user function - since this function
482          * must be allowed to make Acpi calls itself.
483          */
484         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
485         if (ACPI_FAILURE(status)) {
486                 return_ACPI_STATUS(status);
487         }
488
489         status = acpi_ns_walk_namespace(type, start_object, max_depth,
490                                         ACPI_NS_WALK_UNLOCK,
491                                         user_function, context, return_value);
492
493         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
494         return_ACPI_STATUS(status);
495 }
496
497 ACPI_EXPORT_SYMBOL(acpi_walk_namespace)
498
499 /*******************************************************************************
500  *
501  * FUNCTION:    acpi_ns_get_device_callback
502  *
503  * PARAMETERS:  Callback from acpi_get_device
504  *
505  * RETURN:      Status
506  *
507  * DESCRIPTION: Takes callbacks from walk_namespace and filters out all non-
508  *              present devices, or if they specified a HID, it filters based
509  *              on that.
510  *
511  ******************************************************************************/
512 static acpi_status
513 acpi_ns_get_device_callback(acpi_handle obj_handle,
514                             u32 nesting_level,
515                             void *context, void **return_value)
516 {
517         struct acpi_get_devices_info *info = context;
518         acpi_status status;
519         struct acpi_namespace_node *node;
520         u32 flags;
521         struct acpica_device_id hid;
522         struct acpi_compatible_id_list *cid;
523         u32 i;
524         int found;
525
526         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
527         if (ACPI_FAILURE(status)) {
528                 return (status);
529         }
530
531         node = acpi_ns_map_handle_to_node(obj_handle);
532         status = acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
533         if (ACPI_FAILURE(status)) {
534                 return (status);
535         }
536
537         if (!node) {
538                 return (AE_BAD_PARAMETER);
539         }
540
541         /* Run _STA to determine if device is present */
542
543         status = acpi_ut_execute_STA(node, &flags);
544         if (ACPI_FAILURE(status)) {
545                 return (AE_CTRL_DEPTH);
546         }
547
548         if (!(flags & ACPI_STA_DEVICE_PRESENT) &&
549             !(flags & ACPI_STA_DEVICE_FUNCTIONING)) {
550                 /*
551                  * Don't examine the children of the device only when the
552                  * device is neither present nor functional. See ACPI spec,
553                  * description of _STA for more information.
554                  */
555                 return (AE_CTRL_DEPTH);
556         }
557
558         /* Filter based on device HID & CID */
559
560         if (info->hid != NULL) {
561                 status = acpi_ut_execute_HID(node, &hid);
562                 if (status == AE_NOT_FOUND) {
563                         return (AE_OK);
564                 } else if (ACPI_FAILURE(status)) {
565                         return (AE_CTRL_DEPTH);
566                 }
567
568                 if (ACPI_STRNCMP(hid.value, info->hid, sizeof(hid.value)) != 0) {
569
570                         /* Get the list of Compatible IDs */
571
572                         status = acpi_ut_execute_CID(node, &cid);
573                         if (status == AE_NOT_FOUND) {
574                                 return (AE_OK);
575                         } else if (ACPI_FAILURE(status)) {
576                                 return (AE_CTRL_DEPTH);
577                         }
578
579                         /* Walk the CID list */
580
581                         found = 0;
582                         for (i = 0; i < cid->count; i++) {
583                                 if (ACPI_STRNCMP(cid->id[i].value, info->hid,
584                                                  sizeof(struct
585                                                         acpi_compatible_id)) ==
586                                     0) {
587                                         found = 1;
588                                         break;
589                                 }
590                         }
591                         ACPI_FREE(cid);
592                         if (!found)
593                                 return (AE_OK);
594                 }
595         }
596
597         status = info->user_function(obj_handle, nesting_level, info->context,
598                                      return_value);
599         return (status);
600 }
601
602 /*******************************************************************************
603  *
604  * FUNCTION:    acpi_get_devices
605  *
606  * PARAMETERS:  HID                 - HID to search for. Can be NULL.
607  *              user_function       - Called when a matching object is found
608  *              Context             - Passed to user function
609  *              return_value        - Location where return value of
610  *                                    user_function is put if terminated early
611  *
612  * RETURNS      Return value from the user_function if terminated early.
613  *              Otherwise, returns NULL.
614  *
615  * DESCRIPTION: Performs a modified depth-first walk of the namespace tree,
616  *              starting (and ending) at the object specified by start_handle.
617  *              The user_function is called whenever an object of type
618  *              Device is found.  If the user function returns
619  *              a non-zero value, the search is terminated immediately and this
620  *              value is returned to the caller.
621  *
622  *              This is a wrapper for walk_namespace, but the callback performs
623  *              additional filtering. Please see acpi_ns_get_device_callback.
624  *
625  ******************************************************************************/
626
627 acpi_status
628 acpi_get_devices(const char *HID,
629                  acpi_walk_callback user_function,
630                  void *context, void **return_value)
631 {
632         acpi_status status;
633         struct acpi_get_devices_info info;
634
635         ACPI_FUNCTION_TRACE(acpi_get_devices);
636
637         /* Parameter validation */
638
639         if (!user_function) {
640                 return_ACPI_STATUS(AE_BAD_PARAMETER);
641         }
642
643         /*
644          * We're going to call their callback from OUR callback, so we need
645          * to know what it is, and their context parameter.
646          */
647         info.hid = HID;
648         info.context = context;
649         info.user_function = user_function;
650
651         /*
652          * Lock the namespace around the walk.
653          * The namespace will be unlocked/locked around each call
654          * to the user function - since this function
655          * must be allowed to make Acpi calls itself.
656          */
657         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
658         if (ACPI_FAILURE(status)) {
659                 return_ACPI_STATUS(status);
660         }
661
662         status = acpi_ns_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
663                                         ACPI_UINT32_MAX, ACPI_NS_WALK_UNLOCK,
664                                         acpi_ns_get_device_callback, &info,
665                                         return_value);
666
667         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
668         return_ACPI_STATUS(status);
669 }
670
671 ACPI_EXPORT_SYMBOL(acpi_get_devices)
672
673 /*******************************************************************************
674  *
675  * FUNCTION:    acpi_attach_data
676  *
677  * PARAMETERS:  obj_handle          - Namespace node
678  *              Handler             - Handler for this attachment
679  *              Data                - Pointer to data to be attached
680  *
681  * RETURN:      Status
682  *
683  * DESCRIPTION: Attach arbitrary data and handler to a namespace node.
684  *
685  ******************************************************************************/
686 acpi_status
687 acpi_attach_data(acpi_handle obj_handle,
688                  acpi_object_handler handler, void *data)
689 {
690         struct acpi_namespace_node *node;
691         acpi_status status;
692
693         /* Parameter validation */
694
695         if (!obj_handle || !handler || !data) {
696                 return (AE_BAD_PARAMETER);
697         }
698
699         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
700         if (ACPI_FAILURE(status)) {
701                 return (status);
702         }
703
704         /* Convert and validate the handle */
705
706         node = acpi_ns_map_handle_to_node(obj_handle);
707         if (!node) {
708                 status = AE_BAD_PARAMETER;
709                 goto unlock_and_exit;
710         }
711
712         status = acpi_ns_attach_data(node, handler, data);
713
714       unlock_and_exit:
715         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
716         return (status);
717 }
718
719 ACPI_EXPORT_SYMBOL(acpi_attach_data)
720
721 /*******************************************************************************
722  *
723  * FUNCTION:    acpi_detach_data
724  *
725  * PARAMETERS:  obj_handle          - Namespace node handle
726  *              Handler             - Handler used in call to acpi_attach_data
727  *
728  * RETURN:      Status
729  *
730  * DESCRIPTION: Remove data that was previously attached to a node.
731  *
732  ******************************************************************************/
733 acpi_status
734 acpi_detach_data(acpi_handle obj_handle, acpi_object_handler handler)
735 {
736         struct acpi_namespace_node *node;
737         acpi_status status;
738
739         /* Parameter validation */
740
741         if (!obj_handle || !handler) {
742                 return (AE_BAD_PARAMETER);
743         }
744
745         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
746         if (ACPI_FAILURE(status)) {
747                 return (status);
748         }
749
750         /* Convert and validate the handle */
751
752         node = acpi_ns_map_handle_to_node(obj_handle);
753         if (!node) {
754                 status = AE_BAD_PARAMETER;
755                 goto unlock_and_exit;
756         }
757
758         status = acpi_ns_detach_data(node, handler);
759
760       unlock_and_exit:
761         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
762         return (status);
763 }
764
765 ACPI_EXPORT_SYMBOL(acpi_detach_data)
766
767 /*******************************************************************************
768  *
769  * FUNCTION:    acpi_get_data
770  *
771  * PARAMETERS:  obj_handle          - Namespace node
772  *              Handler             - Handler used in call to attach_data
773  *              Data                - Where the data is returned
774  *
775  * RETURN:      Status
776  *
777  * DESCRIPTION: Retrieve data that was previously attached to a namespace node.
778  *
779  ******************************************************************************/
780 acpi_status
781 acpi_get_data(acpi_handle obj_handle, acpi_object_handler handler, void **data)
782 {
783         struct acpi_namespace_node *node;
784         acpi_status status;
785
786         /* Parameter validation */
787
788         if (!obj_handle || !handler || !data) {
789                 return (AE_BAD_PARAMETER);
790         }
791
792         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
793         if (ACPI_FAILURE(status)) {
794                 return (status);
795         }
796
797         /* Convert and validate the handle */
798
799         node = acpi_ns_map_handle_to_node(obj_handle);
800         if (!node) {
801                 status = AE_BAD_PARAMETER;
802                 goto unlock_and_exit;
803         }
804
805         status = acpi_ns_get_attached_data(node, handler, data);
806
807       unlock_and_exit:
808         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
809         return (status);
810 }
811
812 ACPI_EXPORT_SYMBOL(acpi_get_data)