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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 | /* | |
6c9deb72 | 9 | * Copyright (C) 2000 - 2007, R. Byron Moore |
1da177e4 LT |
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 | ||
1da177e4 LT |
45 | #include <acpi/acpi.h> |
46 | #include <acpi/acnamesp.h> | |
47 | #include <acpi/acinterp.h> | |
48 | ||
1da177e4 | 49 | #define _COMPONENT ACPI_NAMESPACE |
4be44fcd | 50 | ACPI_MODULE_NAME("nsxfeval") |
1da177e4 | 51 | |
8313524a | 52 | #ifdef ACPI_FUTURE_USAGE |
1da177e4 LT |
53 | /******************************************************************************* |
54 | * | |
55 | * FUNCTION: acpi_evaluate_object_typed | |
56 | * | |
57 | * PARAMETERS: Handle - Object handle (optional) | |
44f6c012 RM |
58 | * Pathname - Object pathname (optional) |
59 | * external_params - List of parameters to pass to method, | |
1da177e4 LT |
60 | * terminated by NULL. May be NULL |
61 | * if no parameters are being passed. | |
44f6c012 | 62 | * return_buffer - Where to put method's return value (if |
1da177e4 LT |
63 | * any). If NULL, no value is returned. |
64 | * return_type - Expected type of return object | |
65 | * | |
66 | * RETURN: Status | |
67 | * | |
68 | * DESCRIPTION: Find and evaluate the given object, passing the given | |
69 | * parameters if necessary. One of "Handle" or "Pathname" must | |
70 | * be valid (non-null) | |
71 | * | |
72 | ******************************************************************************/ | |
1da177e4 | 73 | acpi_status |
4be44fcd LB |
74 | acpi_evaluate_object_typed(acpi_handle handle, |
75 | acpi_string pathname, | |
8313524a BM |
76 | struct acpi_object_list * external_params, |
77 | struct acpi_buffer * return_buffer, | |
4be44fcd | 78 | acpi_object_type return_type) |
1da177e4 | 79 | { |
4be44fcd LB |
80 | acpi_status status; |
81 | u8 must_free = FALSE; | |
1da177e4 | 82 | |
b229cf92 | 83 | ACPI_FUNCTION_TRACE(acpi_evaluate_object_typed); |
1da177e4 LT |
84 | |
85 | /* Return buffer must be valid */ | |
86 | ||
87 | if (!return_buffer) { | |
4be44fcd | 88 | return_ACPI_STATUS(AE_BAD_PARAMETER); |
1da177e4 LT |
89 | } |
90 | ||
91 | if (return_buffer->length == ACPI_ALLOCATE_BUFFER) { | |
92 | must_free = TRUE; | |
93 | } | |
94 | ||
95 | /* Evaluate the object */ | |
96 | ||
4be44fcd LB |
97 | status = |
98 | acpi_evaluate_object(handle, pathname, external_params, | |
99 | return_buffer); | |
100 | if (ACPI_FAILURE(status)) { | |
101 | return_ACPI_STATUS(status); | |
1da177e4 LT |
102 | } |
103 | ||
104 | /* Type ANY means "don't care" */ | |
105 | ||
106 | if (return_type == ACPI_TYPE_ANY) { | |
4be44fcd | 107 | return_ACPI_STATUS(AE_OK); |
1da177e4 LT |
108 | } |
109 | ||
110 | if (return_buffer->length == 0) { | |
52fc0b02 | 111 | |
1da177e4 LT |
112 | /* Error because caller specifically asked for a return value */ |
113 | ||
b8e4d893 | 114 | ACPI_ERROR((AE_INFO, "No return value")); |
4be44fcd | 115 | return_ACPI_STATUS(AE_NULL_OBJECT); |
1da177e4 LT |
116 | } |
117 | ||
118 | /* Examine the object type returned from evaluate_object */ | |
119 | ||
4be44fcd LB |
120 | if (((union acpi_object *)return_buffer->pointer)->type == return_type) { |
121 | return_ACPI_STATUS(AE_OK); | |
1da177e4 LT |
122 | } |
123 | ||
124 | /* Return object type does not match requested type */ | |
125 | ||
b8e4d893 BM |
126 | ACPI_ERROR((AE_INFO, |
127 | "Incorrect return type [%s] requested [%s]", | |
128 | acpi_ut_get_type_name(((union acpi_object *)return_buffer-> | |
129 | pointer)->type), | |
130 | acpi_ut_get_type_name(return_type))); | |
1da177e4 LT |
131 | |
132 | if (must_free) { | |
52fc0b02 | 133 | |
1da177e4 LT |
134 | /* Caller used ACPI_ALLOCATE_BUFFER, free the return buffer */ |
135 | ||
02438d87 | 136 | ACPI_FREE(return_buffer->pointer); |
1da177e4 LT |
137 | return_buffer->pointer = NULL; |
138 | } | |
139 | ||
140 | return_buffer->length = 0; | |
4be44fcd | 141 | return_ACPI_STATUS(AE_TYPE); |
1da177e4 | 142 | } |
8313524a BM |
143 | |
144 | ACPI_EXPORT_SYMBOL(acpi_evaluate_object_typed) | |
4be44fcd | 145 | #endif /* ACPI_FUTURE_USAGE */ |
1da177e4 LT |
146 | |
147 | /******************************************************************************* | |
148 | * | |
149 | * FUNCTION: acpi_evaluate_object | |
150 | * | |
151 | * PARAMETERS: Handle - Object handle (optional) | |
152 | * Pathname - Object pathname (optional) | |
153 | * external_params - List of parameters to pass to method, | |
154 | * terminated by NULL. May be NULL | |
155 | * if no parameters are being passed. | |
156 | * return_buffer - Where to put method's return value (if | |
157 | * any). If NULL, no value is returned. | |
158 | * | |
159 | * RETURN: Status | |
160 | * | |
161 | * DESCRIPTION: Find and evaluate the given object, passing the given | |
162 | * parameters if necessary. One of "Handle" or "Pathname" must | |
163 | * be valid (non-null) | |
164 | * | |
165 | ******************************************************************************/ | |
1da177e4 | 166 | acpi_status |
4be44fcd LB |
167 | acpi_evaluate_object(acpi_handle handle, |
168 | acpi_string pathname, | |
169 | struct acpi_object_list *external_params, | |
170 | struct acpi_buffer *return_buffer) | |
1da177e4 | 171 | { |
4be44fcd | 172 | acpi_status status; |
a8f4af6d | 173 | acpi_status status2; |
4119532c | 174 | struct acpi_evaluate_info *info; |
4be44fcd LB |
175 | acpi_size buffer_space_needed; |
176 | u32 i; | |
1da177e4 | 177 | |
b229cf92 | 178 | ACPI_FUNCTION_TRACE(acpi_evaluate_object); |
1da177e4 | 179 | |
4119532c BM |
180 | /* Allocate and initialize the evaluation information block */ |
181 | ||
182 | info = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info)); | |
183 | if (!info) { | |
184 | return_ACPI_STATUS(AE_NO_MEMORY); | |
185 | } | |
186 | ||
187 | info->pathname = pathname; | |
188 | info->parameter_type = ACPI_PARAM_ARGS; | |
189 | ||
190 | /* Convert and validate the device handle */ | |
191 | ||
192 | info->prefix_node = acpi_ns_map_handle_to_node(handle); | |
193 | if (!info->prefix_node) { | |
194 | status = AE_BAD_PARAMETER; | |
195 | goto cleanup; | |
196 | } | |
1da177e4 LT |
197 | |
198 | /* | |
4119532c BM |
199 | * If there are parameters to be passed to a control method, the external |
200 | * objects must all be converted to internal objects | |
1da177e4 LT |
201 | */ |
202 | if (external_params && external_params->count) { | |
203 | /* | |
204 | * Allocate a new parameter block for the internal objects | |
205 | * Add 1 to count to allow for null terminated internal list | |
206 | */ | |
4119532c BM |
207 | info->parameters = ACPI_ALLOCATE_ZEROED(((acpi_size) |
208 | external_params-> | |
209 | count + | |
210 | 1) * sizeof(void *)); | |
211 | if (!info->parameters) { | |
212 | status = AE_NO_MEMORY; | |
213 | goto cleanup; | |
1da177e4 LT |
214 | } |
215 | ||
4119532c BM |
216 | /* Convert each external object in the list to an internal object */ |
217 | ||
1da177e4 | 218 | for (i = 0; i < external_params->count; i++) { |
4be44fcd LB |
219 | status = |
220 | acpi_ut_copy_eobject_to_iobject(&external_params-> | |
221 | pointer[i], | |
4119532c | 222 | &info-> |
4be44fcd LB |
223 | parameters[i]); |
224 | if (ACPI_FAILURE(status)) { | |
4119532c | 225 | goto cleanup; |
1da177e4 LT |
226 | } |
227 | } | |
4119532c | 228 | info->parameters[external_params->count] = NULL; |
1da177e4 LT |
229 | } |
230 | ||
1da177e4 LT |
231 | /* |
232 | * Three major cases: | |
233 | * 1) Fully qualified pathname | |
234 | * 2) No handle, not fully qualified pathname (error) | |
235 | * 3) Valid handle | |
236 | */ | |
4be44fcd | 237 | if ((pathname) && (acpi_ns_valid_root_prefix(pathname[0]))) { |
52fc0b02 BM |
238 | |
239 | /* The path is fully qualified, just evaluate by name */ | |
240 | ||
4119532c BM |
241 | info->prefix_node = NULL; |
242 | status = acpi_ns_evaluate(info); | |
4be44fcd | 243 | } else if (!handle) { |
1da177e4 | 244 | /* |
4119532c BM |
245 | * A handle is optional iff a fully qualified pathname is specified. |
246 | * Since we've already handled fully qualified names above, this is | |
247 | * an error | |
1da177e4 LT |
248 | */ |
249 | if (!pathname) { | |
52fc0b02 BM |
250 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
251 | "Both Handle and Pathname are NULL")); | |
4be44fcd | 252 | } else { |
52fc0b02 BM |
253 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
254 | "Null Handle with relative pathname [%s]", | |
255 | pathname)); | |
1da177e4 LT |
256 | } |
257 | ||
258 | status = AE_BAD_PARAMETER; | |
4be44fcd | 259 | } else { |
4119532c | 260 | /* We have a namespace a node and a possible relative path */ |
52fc0b02 | 261 | |
4119532c | 262 | status = acpi_ns_evaluate(info); |
1da177e4 LT |
263 | } |
264 | ||
1da177e4 LT |
265 | /* |
266 | * If we are expecting a return value, and all went well above, | |
267 | * copy the return value to an external object. | |
268 | */ | |
269 | if (return_buffer) { | |
4119532c | 270 | if (!info->return_object) { |
1da177e4 | 271 | return_buffer->length = 0; |
4be44fcd | 272 | } else { |
4119532c | 273 | if (ACPI_GET_DESCRIPTOR_TYPE(info->return_object) == |
4be44fcd | 274 | ACPI_DESC_TYPE_NAMED) { |
1da177e4 LT |
275 | /* |
276 | * If we received a NS Node as a return object, this means that | |
277 | * the object we are evaluating has nothing interesting to | |
278 | * return (such as a mutex, etc.) We return an error because | |
279 | * these types are essentially unsupported by this interface. | |
280 | * We don't check up front because this makes it easier to add | |
281 | * support for various types at a later date if necessary. | |
282 | */ | |
283 | status = AE_TYPE; | |
4119532c | 284 | info->return_object = NULL; /* No need to delete a NS Node */ |
1da177e4 LT |
285 | return_buffer->length = 0; |
286 | } | |
287 | ||
4be44fcd | 288 | if (ACPI_SUCCESS(status)) { |
4119532c BM |
289 | |
290 | /* Get the size of the returned object */ | |
291 | ||
4be44fcd | 292 | status = |
4119532c | 293 | acpi_ut_get_object_size(info->return_object, |
4be44fcd LB |
294 | &buffer_space_needed); |
295 | if (ACPI_SUCCESS(status)) { | |
52fc0b02 | 296 | |
1da177e4 LT |
297 | /* Validate/Allocate/Clear caller buffer */ |
298 | ||
4be44fcd LB |
299 | status = |
300 | acpi_ut_initialize_buffer | |
301 | (return_buffer, | |
302 | buffer_space_needed); | |
303 | if (ACPI_FAILURE(status)) { | |
1da177e4 | 304 | /* |
52fc0b02 BM |
305 | * Caller's buffer is too small or a new one can't |
306 | * be allocated | |
1da177e4 | 307 | */ |
4be44fcd LB |
308 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
309 | "Needed buffer size %X, %s\n", | |
310 | (u32) | |
311 | buffer_space_needed, | |
312 | acpi_format_exception | |
313 | (status))); | |
314 | } else { | |
52fc0b02 BM |
315 | /* We have enough space for the object, build it */ |
316 | ||
4be44fcd LB |
317 | status = |
318 | acpi_ut_copy_iobject_to_eobject | |
4119532c | 319 | (info->return_object, |
4be44fcd | 320 | return_buffer); |
1da177e4 LT |
321 | } |
322 | } | |
323 | } | |
324 | } | |
325 | } | |
326 | ||
4119532c | 327 | if (info->return_object) { |
1da177e4 | 328 | /* |
4119532c BM |
329 | * Delete the internal return object. NOTE: Interpreter must be |
330 | * locked to avoid race condition. | |
1da177e4 | 331 | */ |
a8f4af6d LB |
332 | status2 = acpi_ex_enter_interpreter(); |
333 | if (ACPI_SUCCESS(status2)) { | |
4119532c | 334 | |
a8f4af6d | 335 | /* Remove one reference on the return object (should delete it) */ |
4119532c | 336 | |
a8f4af6d LB |
337 | acpi_ut_remove_reference(info->return_object); |
338 | acpi_ex_exit_interpreter(); | |
339 | } | |
1da177e4 LT |
340 | } |
341 | ||
4119532c BM |
342 | cleanup: |
343 | ||
52fc0b02 BM |
344 | /* Free the input parameter list (if we created one) */ |
345 | ||
4119532c | 346 | if (info->parameters) { |
52fc0b02 | 347 | |
1da177e4 LT |
348 | /* Free the allocated parameter block */ |
349 | ||
4119532c | 350 | acpi_ut_delete_internal_object_list(info->parameters); |
1da177e4 LT |
351 | } |
352 | ||
4119532c | 353 | ACPI_FREE(info); |
4be44fcd | 354 | return_ACPI_STATUS(status); |
1da177e4 | 355 | } |
1da177e4 | 356 | |
8313524a | 357 | ACPI_EXPORT_SYMBOL(acpi_evaluate_object) |
1da177e4 LT |
358 | |
359 | /******************************************************************************* | |
360 | * | |
361 | * FUNCTION: acpi_walk_namespace | |
362 | * | |
363 | * PARAMETERS: Type - acpi_object_type to search for | |
364 | * start_object - Handle in namespace where search begins | |
365 | * max_depth - Depth to which search is to reach | |
366 | * user_function - Called when an object of "Type" is found | |
367 | * Context - Passed to user function | |
368 | * return_value - Location where return value of | |
369 | * user_function is put if terminated early | |
370 | * | |
371 | * RETURNS Return value from the user_function if terminated early. | |
372 | * Otherwise, returns NULL. | |
373 | * | |
374 | * DESCRIPTION: Performs a modified depth-first walk of the namespace tree, | |
375 | * starting (and ending) at the object specified by start_handle. | |
376 | * The user_function is called whenever an object that matches | |
377 | * the type parameter is found. If the user function returns | |
378 | * a non-zero value, the search is terminated immediately and this | |
379 | * value is returned to the caller. | |
380 | * | |
381 | * The point of this procedure is to provide a generic namespace | |
382 | * walk routine that can be called from multiple places to | |
383 | * provide multiple services; the User Function can be tailored | |
384 | * to each task, whether it is a print function, a compare | |
385 | * function, etc. | |
386 | * | |
387 | ******************************************************************************/ | |
1da177e4 | 388 | acpi_status |
4be44fcd LB |
389 | acpi_walk_namespace(acpi_object_type type, |
390 | acpi_handle start_object, | |
391 | u32 max_depth, | |
392 | acpi_walk_callback user_function, | |
393 | void *context, void **return_value) | |
1da177e4 | 394 | { |
4be44fcd | 395 | acpi_status status; |
1da177e4 | 396 | |
b229cf92 | 397 | ACPI_FUNCTION_TRACE(acpi_walk_namespace); |
1da177e4 LT |
398 | |
399 | /* Parameter validation */ | |
400 | ||
96db255c | 401 | if ((type > ACPI_TYPE_LOCAL_MAX) || (!max_depth) || (!user_function)) { |
4be44fcd | 402 | return_ACPI_STATUS(AE_BAD_PARAMETER); |
1da177e4 LT |
403 | } |
404 | ||
405 | /* | |
406 | * Lock the namespace around the walk. | |
407 | * The namespace will be unlocked/locked around each call | |
408 | * to the user function - since this function | |
409 | * must be allowed to make Acpi calls itself. | |
410 | */ | |
4be44fcd LB |
411 | status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); |
412 | if (ACPI_FAILURE(status)) { | |
413 | return_ACPI_STATUS(status); | |
1da177e4 LT |
414 | } |
415 | ||
4be44fcd LB |
416 | status = acpi_ns_walk_namespace(type, start_object, max_depth, |
417 | ACPI_NS_WALK_UNLOCK, | |
418 | user_function, context, return_value); | |
1da177e4 | 419 | |
4be44fcd LB |
420 | (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); |
421 | return_ACPI_STATUS(status); | |
1da177e4 | 422 | } |
1da177e4 | 423 | |
8313524a | 424 | ACPI_EXPORT_SYMBOL(acpi_walk_namespace) |
1da177e4 LT |
425 | |
426 | /******************************************************************************* | |
427 | * | |
428 | * FUNCTION: acpi_ns_get_device_callback | |
429 | * | |
430 | * PARAMETERS: Callback from acpi_get_device | |
431 | * | |
432 | * RETURN: Status | |
433 | * | |
434 | * DESCRIPTION: Takes callbacks from walk_namespace and filters out all non- | |
435 | * present devices, or if they specified a HID, it filters based | |
436 | * on that. | |
437 | * | |
438 | ******************************************************************************/ | |
1da177e4 | 439 | static acpi_status |
4be44fcd LB |
440 | acpi_ns_get_device_callback(acpi_handle obj_handle, |
441 | u32 nesting_level, | |
442 | void *context, void **return_value) | |
1da177e4 | 443 | { |
4be44fcd LB |
444 | struct acpi_get_devices_info *info = context; |
445 | acpi_status status; | |
446 | struct acpi_namespace_node *node; | |
447 | u32 flags; | |
448 | struct acpi_device_id hid; | |
1da177e4 | 449 | struct acpi_compatible_id_list *cid; |
4be44fcd | 450 | acpi_native_uint i; |
1da177e4 | 451 | |
4be44fcd LB |
452 | status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); |
453 | if (ACPI_FAILURE(status)) { | |
1da177e4 LT |
454 | return (status); |
455 | } | |
456 | ||
4be44fcd LB |
457 | node = acpi_ns_map_handle_to_node(obj_handle); |
458 | status = acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); | |
459 | if (ACPI_FAILURE(status)) { | |
1da177e4 LT |
460 | return (status); |
461 | } | |
462 | ||
463 | if (!node) { | |
464 | return (AE_BAD_PARAMETER); | |
465 | } | |
466 | ||
467 | /* Run _STA to determine if device is present */ | |
468 | ||
4be44fcd LB |
469 | status = acpi_ut_execute_STA(node, &flags); |
470 | if (ACPI_FAILURE(status)) { | |
1da177e4 LT |
471 | return (AE_CTRL_DEPTH); |
472 | } | |
473 | ||
defba1d8 | 474 | if (!(flags & ACPI_STA_DEVICE_PRESENT)) { |
52fc0b02 | 475 | |
defba1d8 | 476 | /* Don't examine children of the device if not present */ |
1da177e4 LT |
477 | |
478 | return (AE_CTRL_DEPTH); | |
479 | } | |
480 | ||
481 | /* Filter based on device HID & CID */ | |
482 | ||
483 | if (info->hid != NULL) { | |
4be44fcd | 484 | status = acpi_ut_execute_HID(node, &hid); |
1da177e4 LT |
485 | if (status == AE_NOT_FOUND) { |
486 | return (AE_OK); | |
4be44fcd | 487 | } else if (ACPI_FAILURE(status)) { |
1da177e4 LT |
488 | return (AE_CTRL_DEPTH); |
489 | } | |
490 | ||
4be44fcd | 491 | if (ACPI_STRNCMP(hid.value, info->hid, sizeof(hid.value)) != 0) { |
52fc0b02 | 492 | |
1da177e4 LT |
493 | /* Get the list of Compatible IDs */ |
494 | ||
4be44fcd | 495 | status = acpi_ut_execute_CID(node, &cid); |
1da177e4 LT |
496 | if (status == AE_NOT_FOUND) { |
497 | return (AE_OK); | |
4be44fcd | 498 | } else if (ACPI_FAILURE(status)) { |
1da177e4 LT |
499 | return (AE_CTRL_DEPTH); |
500 | } | |
501 | ||
502 | /* Walk the CID list */ | |
503 | ||
504 | for (i = 0; i < cid->count; i++) { | |
4be44fcd LB |
505 | if (ACPI_STRNCMP(cid->id[i].value, info->hid, |
506 | sizeof(struct | |
507 | acpi_compatible_id)) != | |
508 | 0) { | |
8313524a | 509 | ACPI_FREE(cid); |
1da177e4 LT |
510 | return (AE_OK); |
511 | } | |
512 | } | |
8313524a | 513 | ACPI_FREE(cid); |
1da177e4 LT |
514 | } |
515 | } | |
516 | ||
4be44fcd LB |
517 | status = info->user_function(obj_handle, nesting_level, info->context, |
518 | return_value); | |
1da177e4 LT |
519 | return (status); |
520 | } | |
521 | ||
1da177e4 LT |
522 | /******************************************************************************* |
523 | * | |
524 | * FUNCTION: acpi_get_devices | |
525 | * | |
526 | * PARAMETERS: HID - HID to search for. Can be NULL. | |
527 | * user_function - Called when a matching object is found | |
528 | * Context - Passed to user function | |
529 | * return_value - Location where return value of | |
530 | * user_function is put if terminated early | |
531 | * | |
532 | * RETURNS Return value from the user_function if terminated early. | |
533 | * Otherwise, returns NULL. | |
534 | * | |
535 | * DESCRIPTION: Performs a modified depth-first walk of the namespace tree, | |
536 | * starting (and ending) at the object specified by start_handle. | |
537 | * The user_function is called whenever an object of type | |
538 | * Device is found. If the user function returns | |
539 | * a non-zero value, the search is terminated immediately and this | |
540 | * value is returned to the caller. | |
541 | * | |
542 | * This is a wrapper for walk_namespace, but the callback performs | |
543 | * additional filtering. Please see acpi_get_device_callback. | |
544 | * | |
545 | ******************************************************************************/ | |
546 | ||
547 | acpi_status | |
4be44fcd LB |
548 | acpi_get_devices(char *HID, |
549 | acpi_walk_callback user_function, | |
550 | void *context, void **return_value) | |
1da177e4 | 551 | { |
4be44fcd LB |
552 | acpi_status status; |
553 | struct acpi_get_devices_info info; | |
1da177e4 | 554 | |
b229cf92 | 555 | ACPI_FUNCTION_TRACE(acpi_get_devices); |
1da177e4 LT |
556 | |
557 | /* Parameter validation */ | |
558 | ||
559 | if (!user_function) { | |
4be44fcd | 560 | return_ACPI_STATUS(AE_BAD_PARAMETER); |
1da177e4 LT |
561 | } |
562 | ||
563 | /* | |
564 | * We're going to call their callback from OUR callback, so we need | |
565 | * to know what it is, and their context parameter. | |
566 | */ | |
52fc0b02 | 567 | info.hid = HID; |
4be44fcd | 568 | info.context = context; |
1da177e4 | 569 | info.user_function = user_function; |
1da177e4 LT |
570 | |
571 | /* | |
572 | * Lock the namespace around the walk. | |
573 | * The namespace will be unlocked/locked around each call | |
574 | * to the user function - since this function | |
575 | * must be allowed to make Acpi calls itself. | |
576 | */ | |
4be44fcd LB |
577 | status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); |
578 | if (ACPI_FAILURE(status)) { | |
579 | return_ACPI_STATUS(status); | |
1da177e4 LT |
580 | } |
581 | ||
52fc0b02 BM |
582 | status = acpi_ns_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, |
583 | ACPI_UINT32_MAX, ACPI_NS_WALK_UNLOCK, | |
4be44fcd LB |
584 | acpi_ns_get_device_callback, &info, |
585 | return_value); | |
1da177e4 | 586 | |
4be44fcd LB |
587 | (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); |
588 | return_ACPI_STATUS(status); | |
1da177e4 | 589 | } |
1da177e4 | 590 | |
8313524a | 591 | ACPI_EXPORT_SYMBOL(acpi_get_devices) |
1da177e4 LT |
592 | |
593 | /******************************************************************************* | |
594 | * | |
595 | * FUNCTION: acpi_attach_data | |
596 | * | |
597 | * PARAMETERS: obj_handle - Namespace node | |
598 | * Handler - Handler for this attachment | |
599 | * Data - Pointer to data to be attached | |
600 | * | |
601 | * RETURN: Status | |
602 | * | |
603 | * DESCRIPTION: Attach arbitrary data and handler to a namespace node. | |
604 | * | |
605 | ******************************************************************************/ | |
1da177e4 | 606 | acpi_status |
4be44fcd LB |
607 | acpi_attach_data(acpi_handle obj_handle, |
608 | acpi_object_handler handler, void *data) | |
1da177e4 | 609 | { |
4be44fcd LB |
610 | struct acpi_namespace_node *node; |
611 | acpi_status status; | |
1da177e4 LT |
612 | |
613 | /* Parameter validation */ | |
614 | ||
4be44fcd | 615 | if (!obj_handle || !handler || !data) { |
1da177e4 LT |
616 | return (AE_BAD_PARAMETER); |
617 | } | |
618 | ||
4be44fcd LB |
619 | status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); |
620 | if (ACPI_FAILURE(status)) { | |
1da177e4 LT |
621 | return (status); |
622 | } | |
623 | ||
624 | /* Convert and validate the handle */ | |
625 | ||
4be44fcd | 626 | node = acpi_ns_map_handle_to_node(obj_handle); |
1da177e4 LT |
627 | if (!node) { |
628 | status = AE_BAD_PARAMETER; | |
629 | goto unlock_and_exit; | |
630 | } | |
631 | ||
4be44fcd | 632 | status = acpi_ns_attach_data(node, handler, data); |
1da177e4 | 633 | |
4be44fcd LB |
634 | unlock_and_exit: |
635 | (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); | |
1da177e4 LT |
636 | return (status); |
637 | } | |
638 | ||
8313524a BM |
639 | ACPI_EXPORT_SYMBOL(acpi_attach_data) |
640 | ||
1da177e4 LT |
641 | /******************************************************************************* |
642 | * | |
643 | * FUNCTION: acpi_detach_data | |
644 | * | |
645 | * PARAMETERS: obj_handle - Namespace node handle | |
646 | * Handler - Handler used in call to acpi_attach_data | |
647 | * | |
648 | * RETURN: Status | |
649 | * | |
650 | * DESCRIPTION: Remove data that was previously attached to a node. | |
651 | * | |
652 | ******************************************************************************/ | |
1da177e4 | 653 | acpi_status |
4be44fcd | 654 | acpi_detach_data(acpi_handle obj_handle, acpi_object_handler handler) |
1da177e4 | 655 | { |
4be44fcd LB |
656 | struct acpi_namespace_node *node; |
657 | acpi_status status; | |
1da177e4 LT |
658 | |
659 | /* Parameter validation */ | |
660 | ||
4be44fcd | 661 | if (!obj_handle || !handler) { |
1da177e4 LT |
662 | return (AE_BAD_PARAMETER); |
663 | } | |
664 | ||
4be44fcd LB |
665 | status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); |
666 | if (ACPI_FAILURE(status)) { | |
1da177e4 LT |
667 | return (status); |
668 | } | |
669 | ||
670 | /* Convert and validate the handle */ | |
671 | ||
4be44fcd | 672 | node = acpi_ns_map_handle_to_node(obj_handle); |
1da177e4 LT |
673 | if (!node) { |
674 | status = AE_BAD_PARAMETER; | |
675 | goto unlock_and_exit; | |
676 | } | |
677 | ||
4be44fcd | 678 | status = acpi_ns_detach_data(node, handler); |
1da177e4 | 679 | |
4be44fcd LB |
680 | unlock_and_exit: |
681 | (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); | |
1da177e4 LT |
682 | return (status); |
683 | } | |
684 | ||
8313524a BM |
685 | ACPI_EXPORT_SYMBOL(acpi_detach_data) |
686 | ||
1da177e4 LT |
687 | /******************************************************************************* |
688 | * | |
689 | * FUNCTION: acpi_get_data | |
690 | * | |
691 | * PARAMETERS: obj_handle - Namespace node | |
692 | * Handler - Handler used in call to attach_data | |
693 | * Data - Where the data is returned | |
694 | * | |
695 | * RETURN: Status | |
696 | * | |
697 | * DESCRIPTION: Retrieve data that was previously attached to a namespace node. | |
698 | * | |
699 | ******************************************************************************/ | |
1da177e4 | 700 | acpi_status |
4be44fcd | 701 | acpi_get_data(acpi_handle obj_handle, acpi_object_handler handler, void **data) |
1da177e4 | 702 | { |
4be44fcd LB |
703 | struct acpi_namespace_node *node; |
704 | acpi_status status; | |
1da177e4 LT |
705 | |
706 | /* Parameter validation */ | |
707 | ||
4be44fcd | 708 | if (!obj_handle || !handler || !data) { |
1da177e4 LT |
709 | return (AE_BAD_PARAMETER); |
710 | } | |
711 | ||
4be44fcd LB |
712 | status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); |
713 | if (ACPI_FAILURE(status)) { | |
1da177e4 LT |
714 | return (status); |
715 | } | |
716 | ||
717 | /* Convert and validate the handle */ | |
718 | ||
4be44fcd | 719 | node = acpi_ns_map_handle_to_node(obj_handle); |
1da177e4 LT |
720 | if (!node) { |
721 | status = AE_BAD_PARAMETER; | |
722 | goto unlock_and_exit; | |
723 | } | |
724 | ||
4be44fcd | 725 | status = acpi_ns_get_attached_data(node, handler, data); |
1da177e4 | 726 | |
4be44fcd LB |
727 | unlock_and_exit: |
728 | (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); | |
1da177e4 LT |
729 | return (status); |
730 | } | |
8313524a BM |
731 | |
732 | ACPI_EXPORT_SYMBOL(acpi_get_data) |