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1da177e4 LT |
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 - 2005, R. Byron Moore | |
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 <linux/module.h> | |
46 | ||
47 | #include <acpi/acpi.h> | |
48 | #include <acpi/acnamesp.h> | |
49 | #include <acpi/acinterp.h> | |
50 | ||
51 | ||
52 | #define _COMPONENT ACPI_NAMESPACE | |
53 | ACPI_MODULE_NAME ("nsxfeval") | |
54 | ||
55 | ||
56 | /******************************************************************************* | |
57 | * | |
58 | * FUNCTION: acpi_evaluate_object_typed | |
59 | * | |
60 | * PARAMETERS: Handle - Object handle (optional) | |
44f6c012 RM |
61 | * Pathname - Object pathname (optional) |
62 | * external_params - List of parameters to pass to method, | |
1da177e4 LT |
63 | * terminated by NULL. May be NULL |
64 | * if no parameters are being passed. | |
44f6c012 | 65 | * return_buffer - Where to put method's return value (if |
1da177e4 LT |
66 | * any). If NULL, no value is returned. |
67 | * return_type - Expected type of return object | |
68 | * | |
69 | * RETURN: Status | |
70 | * | |
71 | * DESCRIPTION: Find and evaluate the given object, passing the given | |
72 | * parameters if necessary. One of "Handle" or "Pathname" must | |
73 | * be valid (non-null) | |
74 | * | |
75 | ******************************************************************************/ | |
44f6c012 | 76 | |
1da177e4 LT |
77 | #ifdef ACPI_FUTURE_USAGE |
78 | acpi_status | |
79 | acpi_evaluate_object_typed ( | |
80 | acpi_handle handle, | |
81 | acpi_string pathname, | |
82 | struct acpi_object_list *external_params, | |
83 | struct acpi_buffer *return_buffer, | |
84 | acpi_object_type return_type) | |
85 | { | |
86 | acpi_status status; | |
87 | u8 must_free = FALSE; | |
88 | ||
89 | ||
90 | ACPI_FUNCTION_TRACE ("acpi_evaluate_object_typed"); | |
91 | ||
92 | ||
93 | /* Return buffer must be valid */ | |
94 | ||
95 | if (!return_buffer) { | |
96 | return_ACPI_STATUS (AE_BAD_PARAMETER); | |
97 | } | |
98 | ||
99 | if (return_buffer->length == ACPI_ALLOCATE_BUFFER) { | |
100 | must_free = TRUE; | |
101 | } | |
102 | ||
103 | /* Evaluate the object */ | |
104 | ||
105 | status = acpi_evaluate_object (handle, pathname, external_params, return_buffer); | |
106 | if (ACPI_FAILURE (status)) { | |
107 | return_ACPI_STATUS (status); | |
108 | } | |
109 | ||
110 | /* Type ANY means "don't care" */ | |
111 | ||
112 | if (return_type == ACPI_TYPE_ANY) { | |
113 | return_ACPI_STATUS (AE_OK); | |
114 | } | |
115 | ||
116 | if (return_buffer->length == 0) { | |
117 | /* Error because caller specifically asked for a return value */ | |
118 | ||
119 | ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, | |
120 | "No return value\n")); | |
121 | ||
122 | return_ACPI_STATUS (AE_NULL_OBJECT); | |
123 | } | |
124 | ||
125 | /* Examine the object type returned from evaluate_object */ | |
126 | ||
127 | if (((union acpi_object *) return_buffer->pointer)->type == return_type) { | |
128 | return_ACPI_STATUS (AE_OK); | |
129 | } | |
130 | ||
131 | /* Return object type does not match requested type */ | |
132 | ||
133 | ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, | |
134 | "Incorrect return type [%s] requested [%s]\n", | |
135 | acpi_ut_get_type_name (((union acpi_object *) return_buffer->pointer)->type), | |
136 | acpi_ut_get_type_name (return_type))); | |
137 | ||
138 | if (must_free) { | |
139 | /* Caller used ACPI_ALLOCATE_BUFFER, free the return buffer */ | |
140 | ||
141 | acpi_os_free (return_buffer->pointer); | |
142 | return_buffer->pointer = NULL; | |
143 | } | |
144 | ||
145 | return_buffer->length = 0; | |
146 | return_ACPI_STATUS (AE_TYPE); | |
147 | } | |
148 | #endif /* ACPI_FUTURE_USAGE */ | |
149 | ||
150 | ||
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 | ||
171 | acpi_status | |
172 | acpi_evaluate_object ( | |
173 | acpi_handle handle, | |
174 | acpi_string pathname, | |
175 | struct acpi_object_list *external_params, | |
176 | struct acpi_buffer *return_buffer) | |
177 | { | |
178 | acpi_status status; | |
179 | acpi_status status2; | |
180 | struct acpi_parameter_info info; | |
181 | acpi_size buffer_space_needed; | |
182 | u32 i; | |
183 | ||
184 | ||
185 | ACPI_FUNCTION_TRACE ("acpi_evaluate_object"); | |
186 | ||
187 | ||
188 | info.node = handle; | |
189 | info.parameters = NULL; | |
190 | info.return_object = NULL; | |
191 | info.parameter_type = ACPI_PARAM_ARGS; | |
192 | ||
193 | /* | |
194 | * If there are parameters to be passed to the object | |
195 | * (which must be a control method), the external objects | |
196 | * must be converted to internal objects | |
197 | */ | |
198 | if (external_params && external_params->count) { | |
199 | /* | |
200 | * Allocate a new parameter block for the internal objects | |
201 | * Add 1 to count to allow for null terminated internal list | |
202 | */ | |
203 | info.parameters = ACPI_MEM_CALLOCATE ( | |
204 | ((acpi_size) external_params->count + 1) * | |
205 | sizeof (void *)); | |
206 | if (!info.parameters) { | |
207 | return_ACPI_STATUS (AE_NO_MEMORY); | |
208 | } | |
209 | ||
210 | /* | |
211 | * Convert each external object in the list to an | |
212 | * internal object | |
213 | */ | |
214 | for (i = 0; i < external_params->count; i++) { | |
215 | status = acpi_ut_copy_eobject_to_iobject (&external_params->pointer[i], | |
216 | &info.parameters[i]); | |
217 | if (ACPI_FAILURE (status)) { | |
218 | acpi_ut_delete_internal_object_list (info.parameters); | |
219 | return_ACPI_STATUS (status); | |
220 | } | |
221 | } | |
222 | info.parameters[external_params->count] = NULL; | |
223 | } | |
224 | ||
225 | ||
226 | /* | |
227 | * Three major cases: | |
228 | * 1) Fully qualified pathname | |
229 | * 2) No handle, not fully qualified pathname (error) | |
230 | * 3) Valid handle | |
231 | */ | |
232 | if ((pathname) && | |
233 | (acpi_ns_valid_root_prefix (pathname[0]))) { | |
234 | /* | |
235 | * The path is fully qualified, just evaluate by name | |
236 | */ | |
237 | status = acpi_ns_evaluate_by_name (pathname, &info); | |
238 | } | |
239 | else if (!handle) { | |
240 | /* | |
241 | * A handle is optional iff a fully qualified pathname | |
242 | * is specified. Since we've already handled fully | |
243 | * qualified names above, this is an error | |
244 | */ | |
245 | if (!pathname) { | |
246 | ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, | |
247 | "Both Handle and Pathname are NULL\n")); | |
248 | } | |
249 | else { | |
250 | ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, | |
251 | "Handle is NULL and Pathname is relative\n")); | |
252 | } | |
253 | ||
254 | status = AE_BAD_PARAMETER; | |
255 | } | |
256 | else { | |
257 | /* | |
258 | * We get here if we have a handle -- and if we have a | |
259 | * pathname it is relative. The handle will be validated | |
260 | * in the lower procedures | |
261 | */ | |
262 | if (!pathname) { | |
263 | /* | |
264 | * The null pathname case means the handle is for | |
265 | * the actual object to be evaluated | |
266 | */ | |
267 | status = acpi_ns_evaluate_by_handle (&info); | |
268 | } | |
269 | else { | |
270 | /* | |
271 | * Both a Handle and a relative Pathname | |
272 | */ | |
273 | status = acpi_ns_evaluate_relative (pathname, &info); | |
274 | } | |
275 | } | |
276 | ||
277 | ||
278 | /* | |
279 | * If we are expecting a return value, and all went well above, | |
280 | * copy the return value to an external object. | |
281 | */ | |
282 | if (return_buffer) { | |
283 | if (!info.return_object) { | |
284 | return_buffer->length = 0; | |
285 | } | |
286 | else { | |
287 | if (ACPI_GET_DESCRIPTOR_TYPE (info.return_object) == ACPI_DESC_TYPE_NAMED) { | |
288 | /* | |
289 | * If we received a NS Node as a return object, this means that | |
290 | * the object we are evaluating has nothing interesting to | |
291 | * return (such as a mutex, etc.) We return an error because | |
292 | * these types are essentially unsupported by this interface. | |
293 | * We don't check up front because this makes it easier to add | |
294 | * support for various types at a later date if necessary. | |
295 | */ | |
296 | status = AE_TYPE; | |
297 | info.return_object = NULL; /* No need to delete a NS Node */ | |
298 | return_buffer->length = 0; | |
299 | } | |
300 | ||
301 | if (ACPI_SUCCESS (status)) { | |
302 | /* | |
303 | * Find out how large a buffer is needed | |
304 | * to contain the returned object | |
305 | */ | |
306 | status = acpi_ut_get_object_size (info.return_object, | |
307 | &buffer_space_needed); | |
308 | if (ACPI_SUCCESS (status)) { | |
309 | /* Validate/Allocate/Clear caller buffer */ | |
310 | ||
44f6c012 RM |
311 | status = acpi_ut_initialize_buffer (return_buffer, |
312 | buffer_space_needed); | |
1da177e4 LT |
313 | if (ACPI_FAILURE (status)) { |
314 | /* | |
315 | * Caller's buffer is too small or a new one can't be allocated | |
316 | */ | |
317 | ACPI_DEBUG_PRINT ((ACPI_DB_INFO, | |
318 | "Needed buffer size %X, %s\n", | |
319 | (u32) buffer_space_needed, | |
320 | acpi_format_exception (status))); | |
321 | } | |
322 | else { | |
323 | /* | |
324 | * We have enough space for the object, build it | |
325 | */ | |
326 | status = acpi_ut_copy_iobject_to_eobject (info.return_object, | |
327 | return_buffer); | |
328 | } | |
329 | } | |
330 | } | |
331 | } | |
332 | } | |
333 | ||
334 | if (info.return_object) { | |
335 | /* | |
336 | * Delete the internal return object. NOTE: Interpreter | |
337 | * must be locked to avoid race condition. | |
338 | */ | |
339 | status2 = acpi_ex_enter_interpreter (); | |
340 | if (ACPI_SUCCESS (status2)) { | |
341 | /* | |
342 | * Delete the internal return object. (Or at least | |
343 | * decrement the reference count by one) | |
344 | */ | |
345 | acpi_ut_remove_reference (info.return_object); | |
346 | acpi_ex_exit_interpreter (); | |
347 | } | |
348 | } | |
349 | ||
350 | /* | |
351 | * Free the input parameter list (if we created one), | |
352 | */ | |
353 | if (info.parameters) { | |
354 | /* Free the allocated parameter block */ | |
355 | ||
356 | acpi_ut_delete_internal_object_list (info.parameters); | |
357 | } | |
358 | ||
359 | return_ACPI_STATUS (status); | |
360 | } | |
361 | EXPORT_SYMBOL(acpi_evaluate_object); | |
362 | ||
363 | ||
364 | /******************************************************************************* | |
365 | * | |
366 | * FUNCTION: acpi_walk_namespace | |
367 | * | |
368 | * PARAMETERS: Type - acpi_object_type to search for | |
369 | * start_object - Handle in namespace where search begins | |
370 | * max_depth - Depth to which search is to reach | |
371 | * user_function - Called when an object of "Type" is found | |
372 | * Context - Passed to user function | |
373 | * return_value - Location where return value of | |
374 | * user_function is put if terminated early | |
375 | * | |
376 | * RETURNS Return value from the user_function if terminated early. | |
377 | * Otherwise, returns NULL. | |
378 | * | |
379 | * DESCRIPTION: Performs a modified depth-first walk of the namespace tree, | |
380 | * starting (and ending) at the object specified by start_handle. | |
381 | * The user_function is called whenever an object that matches | |
382 | * the type parameter is found. If the user function returns | |
383 | * a non-zero value, the search is terminated immediately and this | |
384 | * value is returned to the caller. | |
385 | * | |
386 | * The point of this procedure is to provide a generic namespace | |
387 | * walk routine that can be called from multiple places to | |
388 | * provide multiple services; the User Function can be tailored | |
389 | * to each task, whether it is a print function, a compare | |
390 | * function, etc. | |
391 | * | |
392 | ******************************************************************************/ | |
393 | ||
394 | acpi_status | |
395 | acpi_walk_namespace ( | |
396 | acpi_object_type type, | |
397 | acpi_handle start_object, | |
398 | u32 max_depth, | |
399 | acpi_walk_callback user_function, | |
400 | void *context, | |
401 | void **return_value) | |
402 | { | |
403 | acpi_status status; | |
404 | ||
405 | ||
406 | ACPI_FUNCTION_TRACE ("acpi_walk_namespace"); | |
407 | ||
408 | ||
409 | /* Parameter validation */ | |
410 | ||
411 | if ((type > ACPI_TYPE_EXTERNAL_MAX) || | |
412 | (!max_depth) || | |
413 | (!user_function)) { | |
414 | return_ACPI_STATUS (AE_BAD_PARAMETER); | |
415 | } | |
416 | ||
417 | /* | |
418 | * Lock the namespace around the walk. | |
419 | * The namespace will be unlocked/locked around each call | |
420 | * to the user function - since this function | |
421 | * must be allowed to make Acpi calls itself. | |
422 | */ | |
423 | status = acpi_ut_acquire_mutex (ACPI_MTX_NAMESPACE); | |
424 | if (ACPI_FAILURE (status)) { | |
425 | return_ACPI_STATUS (status); | |
426 | } | |
427 | ||
44f6c012 RM |
428 | status = acpi_ns_walk_namespace (type, start_object, max_depth, |
429 | ACPI_NS_WALK_UNLOCK, | |
1da177e4 LT |
430 | user_function, context, return_value); |
431 | ||
432 | (void) acpi_ut_release_mutex (ACPI_MTX_NAMESPACE); | |
433 | return_ACPI_STATUS (status); | |
434 | } | |
435 | EXPORT_SYMBOL(acpi_walk_namespace); | |
436 | ||
437 | ||
438 | /******************************************************************************* | |
439 | * | |
440 | * FUNCTION: acpi_ns_get_device_callback | |
441 | * | |
442 | * PARAMETERS: Callback from acpi_get_device | |
443 | * | |
444 | * RETURN: Status | |
445 | * | |
446 | * DESCRIPTION: Takes callbacks from walk_namespace and filters out all non- | |
447 | * present devices, or if they specified a HID, it filters based | |
448 | * on that. | |
449 | * | |
450 | ******************************************************************************/ | |
451 | ||
452 | static acpi_status | |
453 | acpi_ns_get_device_callback ( | |
454 | acpi_handle obj_handle, | |
455 | u32 nesting_level, | |
456 | void *context, | |
457 | void **return_value) | |
458 | { | |
459 | struct acpi_get_devices_info *info = context; | |
460 | acpi_status status; | |
461 | struct acpi_namespace_node *node; | |
462 | u32 flags; | |
463 | struct acpi_device_id hid; | |
464 | struct acpi_compatible_id_list *cid; | |
465 | acpi_native_uint i; | |
466 | ||
467 | ||
468 | status = acpi_ut_acquire_mutex (ACPI_MTX_NAMESPACE); | |
469 | if (ACPI_FAILURE (status)) { | |
470 | return (status); | |
471 | } | |
472 | ||
473 | node = acpi_ns_map_handle_to_node (obj_handle); | |
474 | status = acpi_ut_release_mutex (ACPI_MTX_NAMESPACE); | |
475 | if (ACPI_FAILURE (status)) { | |
476 | return (status); | |
477 | } | |
478 | ||
479 | if (!node) { | |
480 | return (AE_BAD_PARAMETER); | |
481 | } | |
482 | ||
483 | /* Run _STA to determine if device is present */ | |
484 | ||
485 | status = acpi_ut_execute_STA (node, &flags); | |
486 | if (ACPI_FAILURE (status)) { | |
487 | return (AE_CTRL_DEPTH); | |
488 | } | |
489 | ||
490 | if (!(flags & 0x01)) { | |
491 | /* Don't return at the device or children of the device if not there */ | |
492 | ||
493 | return (AE_CTRL_DEPTH); | |
494 | } | |
495 | ||
496 | /* Filter based on device HID & CID */ | |
497 | ||
498 | if (info->hid != NULL) { | |
499 | status = acpi_ut_execute_HID (node, &hid); | |
500 | if (status == AE_NOT_FOUND) { | |
501 | return (AE_OK); | |
502 | } | |
503 | else if (ACPI_FAILURE (status)) { | |
504 | return (AE_CTRL_DEPTH); | |
505 | } | |
506 | ||
507 | if (ACPI_STRNCMP (hid.value, info->hid, sizeof (hid.value)) != 0) { | |
508 | /* Get the list of Compatible IDs */ | |
509 | ||
510 | status = acpi_ut_execute_CID (node, &cid); | |
511 | if (status == AE_NOT_FOUND) { | |
512 | return (AE_OK); | |
513 | } | |
514 | else if (ACPI_FAILURE (status)) { | |
515 | return (AE_CTRL_DEPTH); | |
516 | } | |
517 | ||
518 | /* Walk the CID list */ | |
519 | ||
520 | for (i = 0; i < cid->count; i++) { | |
521 | if (ACPI_STRNCMP (cid->id[i].value, info->hid, | |
522 | sizeof (struct acpi_compatible_id)) != 0) { | |
523 | ACPI_MEM_FREE (cid); | |
524 | return (AE_OK); | |
525 | } | |
526 | } | |
527 | ACPI_MEM_FREE (cid); | |
528 | } | |
529 | } | |
530 | ||
44f6c012 RM |
531 | status = info->user_function (obj_handle, nesting_level, info->context, |
532 | return_value); | |
1da177e4 LT |
533 | return (status); |
534 | } | |
535 | ||
536 | ||
537 | /******************************************************************************* | |
538 | * | |
539 | * FUNCTION: acpi_get_devices | |
540 | * | |
541 | * PARAMETERS: HID - HID to search for. Can be NULL. | |
542 | * user_function - Called when a matching object is found | |
543 | * Context - Passed to user function | |
544 | * return_value - Location where return value of | |
545 | * user_function is put if terminated early | |
546 | * | |
547 | * RETURNS Return value from the user_function if terminated early. | |
548 | * Otherwise, returns NULL. | |
549 | * | |
550 | * DESCRIPTION: Performs a modified depth-first walk of the namespace tree, | |
551 | * starting (and ending) at the object specified by start_handle. | |
552 | * The user_function is called whenever an object of type | |
553 | * Device is found. If the user function returns | |
554 | * a non-zero value, the search is terminated immediately and this | |
555 | * value is returned to the caller. | |
556 | * | |
557 | * This is a wrapper for walk_namespace, but the callback performs | |
558 | * additional filtering. Please see acpi_get_device_callback. | |
559 | * | |
560 | ******************************************************************************/ | |
561 | ||
562 | acpi_status | |
563 | acpi_get_devices ( | |
564 | char *HID, | |
565 | acpi_walk_callback user_function, | |
566 | void *context, | |
567 | void **return_value) | |
568 | { | |
569 | acpi_status status; | |
570 | struct acpi_get_devices_info info; | |
571 | ||
572 | ||
573 | ACPI_FUNCTION_TRACE ("acpi_get_devices"); | |
574 | ||
575 | ||
576 | /* Parameter validation */ | |
577 | ||
578 | if (!user_function) { | |
579 | return_ACPI_STATUS (AE_BAD_PARAMETER); | |
580 | } | |
581 | ||
582 | /* | |
583 | * We're going to call their callback from OUR callback, so we need | |
584 | * to know what it is, and their context parameter. | |
585 | */ | |
586 | info.context = context; | |
587 | info.user_function = user_function; | |
588 | info.hid = HID; | |
589 | ||
590 | /* | |
591 | * Lock the namespace around the walk. | |
592 | * The namespace will be unlocked/locked around each call | |
593 | * to the user function - since this function | |
594 | * must be allowed to make Acpi calls itself. | |
595 | */ | |
596 | status = acpi_ut_acquire_mutex (ACPI_MTX_NAMESPACE); | |
597 | if (ACPI_FAILURE (status)) { | |
598 | return_ACPI_STATUS (status); | |
599 | } | |
600 | ||
601 | status = acpi_ns_walk_namespace (ACPI_TYPE_DEVICE, | |
602 | ACPI_ROOT_OBJECT, ACPI_UINT32_MAX, | |
603 | ACPI_NS_WALK_UNLOCK, | |
604 | acpi_ns_get_device_callback, &info, | |
605 | return_value); | |
606 | ||
607 | (void) acpi_ut_release_mutex (ACPI_MTX_NAMESPACE); | |
608 | return_ACPI_STATUS (status); | |
609 | } | |
610 | EXPORT_SYMBOL(acpi_get_devices); | |
611 | ||
612 | ||
613 | /******************************************************************************* | |
614 | * | |
615 | * FUNCTION: acpi_attach_data | |
616 | * | |
617 | * PARAMETERS: obj_handle - Namespace node | |
618 | * Handler - Handler for this attachment | |
619 | * Data - Pointer to data to be attached | |
620 | * | |
621 | * RETURN: Status | |
622 | * | |
623 | * DESCRIPTION: Attach arbitrary data and handler to a namespace node. | |
624 | * | |
625 | ******************************************************************************/ | |
626 | ||
627 | acpi_status | |
628 | acpi_attach_data ( | |
629 | acpi_handle obj_handle, | |
630 | acpi_object_handler handler, | |
631 | void *data) | |
632 | { | |
633 | struct acpi_namespace_node *node; | |
634 | acpi_status status; | |
635 | ||
636 | ||
637 | /* Parameter validation */ | |
638 | ||
639 | if (!obj_handle || | |
640 | !handler || | |
641 | !data) { | |
642 | return (AE_BAD_PARAMETER); | |
643 | } | |
644 | ||
645 | status = acpi_ut_acquire_mutex (ACPI_MTX_NAMESPACE); | |
646 | if (ACPI_FAILURE (status)) { | |
647 | return (status); | |
648 | } | |
649 | ||
650 | /* Convert and validate the handle */ | |
651 | ||
652 | node = acpi_ns_map_handle_to_node (obj_handle); | |
653 | if (!node) { | |
654 | status = AE_BAD_PARAMETER; | |
655 | goto unlock_and_exit; | |
656 | } | |
657 | ||
658 | status = acpi_ns_attach_data (node, handler, data); | |
659 | ||
660 | unlock_and_exit: | |
661 | (void) acpi_ut_release_mutex (ACPI_MTX_NAMESPACE); | |
662 | return (status); | |
663 | } | |
664 | ||
665 | ||
666 | /******************************************************************************* | |
667 | * | |
668 | * FUNCTION: acpi_detach_data | |
669 | * | |
670 | * PARAMETERS: obj_handle - Namespace node handle | |
671 | * Handler - Handler used in call to acpi_attach_data | |
672 | * | |
673 | * RETURN: Status | |
674 | * | |
675 | * DESCRIPTION: Remove data that was previously attached to a node. | |
676 | * | |
677 | ******************************************************************************/ | |
678 | ||
679 | acpi_status | |
680 | acpi_detach_data ( | |
681 | acpi_handle obj_handle, | |
682 | acpi_object_handler handler) | |
683 | { | |
684 | struct acpi_namespace_node *node; | |
685 | acpi_status status; | |
686 | ||
687 | ||
688 | /* Parameter validation */ | |
689 | ||
690 | if (!obj_handle || | |
691 | !handler) { | |
692 | return (AE_BAD_PARAMETER); | |
693 | } | |
694 | ||
695 | status = acpi_ut_acquire_mutex (ACPI_MTX_NAMESPACE); | |
696 | if (ACPI_FAILURE (status)) { | |
697 | return (status); | |
698 | } | |
699 | ||
700 | /* Convert and validate the handle */ | |
701 | ||
702 | node = acpi_ns_map_handle_to_node (obj_handle); | |
703 | if (!node) { | |
704 | status = AE_BAD_PARAMETER; | |
705 | goto unlock_and_exit; | |
706 | } | |
707 | ||
708 | status = acpi_ns_detach_data (node, handler); | |
709 | ||
710 | unlock_and_exit: | |
711 | (void) acpi_ut_release_mutex (ACPI_MTX_NAMESPACE); | |
712 | return (status); | |
713 | } | |
714 | ||
715 | ||
716 | /******************************************************************************* | |
717 | * | |
718 | * FUNCTION: acpi_get_data | |
719 | * | |
720 | * PARAMETERS: obj_handle - Namespace node | |
721 | * Handler - Handler used in call to attach_data | |
722 | * Data - Where the data is returned | |
723 | * | |
724 | * RETURN: Status | |
725 | * | |
726 | * DESCRIPTION: Retrieve data that was previously attached to a namespace node. | |
727 | * | |
728 | ******************************************************************************/ | |
729 | ||
730 | acpi_status | |
731 | acpi_get_data ( | |
732 | acpi_handle obj_handle, | |
733 | acpi_object_handler handler, | |
734 | void **data) | |
735 | { | |
736 | struct acpi_namespace_node *node; | |
737 | acpi_status status; | |
738 | ||
739 | ||
740 | /* Parameter validation */ | |
741 | ||
742 | if (!obj_handle || | |
743 | !handler || | |
744 | !data) { | |
745 | return (AE_BAD_PARAMETER); | |
746 | } | |
747 | ||
748 | status = acpi_ut_acquire_mutex (ACPI_MTX_NAMESPACE); | |
749 | if (ACPI_FAILURE (status)) { | |
750 | return (status); | |
751 | } | |
752 | ||
753 | /* Convert and validate the handle */ | |
754 | ||
755 | node = acpi_ns_map_handle_to_node (obj_handle); | |
756 | if (!node) { | |
757 | status = AE_BAD_PARAMETER; | |
758 | goto unlock_and_exit; | |
759 | } | |
760 | ||
761 | status = acpi_ns_get_attached_data (node, handler, data); | |
762 | ||
763 | unlock_and_exit: | |
764 | (void) acpi_ut_release_mutex (ACPI_MTX_NAMESPACE); | |
765 | return (status); | |
766 | } | |
767 | ||
768 |