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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 | /* | |
4a90c7e8 | 9 | * Copyright (C) 2000 - 2006, 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 | ||
4be44fcd | 136 | acpi_os_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 LB |
172 | acpi_status status; |
173 | acpi_status status2; | |
174 | struct acpi_parameter_info info; | |
175 | acpi_size buffer_space_needed; | |
176 | u32 i; | |
1da177e4 | 177 | |
b229cf92 | 178 | ACPI_FUNCTION_TRACE(acpi_evaluate_object); |
1da177e4 LT |
179 | |
180 | info.node = handle; | |
181 | info.parameters = NULL; | |
182 | info.return_object = NULL; | |
183 | info.parameter_type = ACPI_PARAM_ARGS; | |
184 | ||
185 | /* | |
186 | * If there are parameters to be passed to the object | |
187 | * (which must be a control method), the external objects | |
188 | * must be converted to internal objects | |
189 | */ | |
190 | if (external_params && external_params->count) { | |
191 | /* | |
192 | * Allocate a new parameter block for the internal objects | |
193 | * Add 1 to count to allow for null terminated internal list | |
194 | */ | |
8313524a BM |
195 | info.parameters = ACPI_ALLOCATE_ZEROED(((acpi_size) |
196 | external_params->count + | |
197 | 1) * sizeof(void *)); | |
1da177e4 | 198 | if (!info.parameters) { |
4be44fcd | 199 | return_ACPI_STATUS(AE_NO_MEMORY); |
1da177e4 LT |
200 | } |
201 | ||
202 | /* | |
203 | * Convert each external object in the list to an | |
204 | * internal object | |
205 | */ | |
206 | for (i = 0; i < external_params->count; i++) { | |
4be44fcd LB |
207 | status = |
208 | acpi_ut_copy_eobject_to_iobject(&external_params-> | |
209 | pointer[i], | |
210 | &info. | |
211 | parameters[i]); | |
212 | if (ACPI_FAILURE(status)) { | |
213 | acpi_ut_delete_internal_object_list(info. | |
214 | parameters); | |
215 | return_ACPI_STATUS(status); | |
1da177e4 LT |
216 | } |
217 | } | |
218 | info.parameters[external_params->count] = NULL; | |
219 | } | |
220 | ||
1da177e4 LT |
221 | /* |
222 | * Three major cases: | |
223 | * 1) Fully qualified pathname | |
224 | * 2) No handle, not fully qualified pathname (error) | |
225 | * 3) Valid handle | |
226 | */ | |
4be44fcd | 227 | if ((pathname) && (acpi_ns_valid_root_prefix(pathname[0]))) { |
52fc0b02 BM |
228 | |
229 | /* The path is fully qualified, just evaluate by name */ | |
230 | ||
4be44fcd LB |
231 | status = acpi_ns_evaluate_by_name(pathname, &info); |
232 | } else if (!handle) { | |
1da177e4 LT |
233 | /* |
234 | * A handle is optional iff a fully qualified pathname | |
235 | * is specified. Since we've already handled fully | |
236 | * qualified names above, this is an error | |
237 | */ | |
238 | if (!pathname) { | |
52fc0b02 BM |
239 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
240 | "Both Handle and Pathname are NULL")); | |
4be44fcd | 241 | } else { |
52fc0b02 BM |
242 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
243 | "Null Handle with relative pathname [%s]", | |
244 | pathname)); | |
1da177e4 LT |
245 | } |
246 | ||
247 | status = AE_BAD_PARAMETER; | |
4be44fcd | 248 | } else { |
1da177e4 LT |
249 | /* |
250 | * We get here if we have a handle -- and if we have a | |
251 | * pathname it is relative. The handle will be validated | |
252 | * in the lower procedures | |
253 | */ | |
254 | if (!pathname) { | |
255 | /* | |
256 | * The null pathname case means the handle is for | |
257 | * the actual object to be evaluated | |
258 | */ | |
4be44fcd LB |
259 | status = acpi_ns_evaluate_by_handle(&info); |
260 | } else { | |
52fc0b02 BM |
261 | /* Both a Handle and a relative Pathname */ |
262 | ||
4be44fcd | 263 | status = acpi_ns_evaluate_relative(pathname, &info); |
1da177e4 LT |
264 | } |
265 | } | |
266 | ||
1da177e4 LT |
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; | |
4be44fcd LB |
274 | } else { |
275 | if (ACPI_GET_DESCRIPTOR_TYPE(info.return_object) == | |
276 | ACPI_DESC_TYPE_NAMED) { | |
1da177e4 LT |
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; | |
4be44fcd | 286 | info.return_object = NULL; /* No need to delete a NS Node */ |
1da177e4 LT |
287 | return_buffer->length = 0; |
288 | } | |
289 | ||
4be44fcd | 290 | if (ACPI_SUCCESS(status)) { |
1da177e4 LT |
291 | /* |
292 | * Find out how large a buffer is needed | |
293 | * to contain the returned object | |
294 | */ | |
4be44fcd LB |
295 | status = |
296 | acpi_ut_get_object_size(info.return_object, | |
297 | &buffer_space_needed); | |
298 | if (ACPI_SUCCESS(status)) { | |
52fc0b02 | 299 | |
1da177e4 LT |
300 | /* Validate/Allocate/Clear caller buffer */ |
301 | ||
4be44fcd LB |
302 | status = |
303 | acpi_ut_initialize_buffer | |
304 | (return_buffer, | |
305 | buffer_space_needed); | |
306 | if (ACPI_FAILURE(status)) { | |
1da177e4 | 307 | /* |
52fc0b02 BM |
308 | * Caller's buffer is too small or a new one can't |
309 | * be allocated | |
1da177e4 | 310 | */ |
4be44fcd LB |
311 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
312 | "Needed buffer size %X, %s\n", | |
313 | (u32) | |
314 | buffer_space_needed, | |
315 | acpi_format_exception | |
316 | (status))); | |
317 | } else { | |
52fc0b02 BM |
318 | /* We have enough space for the object, build it */ |
319 | ||
4be44fcd LB |
320 | status = |
321 | acpi_ut_copy_iobject_to_eobject | |
322 | (info.return_object, | |
323 | return_buffer); | |
1da177e4 LT |
324 | } |
325 | } | |
326 | } | |
327 | } | |
328 | } | |
329 | ||
330 | if (info.return_object) { | |
331 | /* | |
332 | * Delete the internal return object. NOTE: Interpreter | |
333 | * must be locked to avoid race condition. | |
334 | */ | |
4be44fcd LB |
335 | status2 = acpi_ex_enter_interpreter(); |
336 | if (ACPI_SUCCESS(status2)) { | |
1da177e4 LT |
337 | /* |
338 | * Delete the internal return object. (Or at least | |
339 | * decrement the reference count by one) | |
340 | */ | |
4be44fcd LB |
341 | acpi_ut_remove_reference(info.return_object); |
342 | acpi_ex_exit_interpreter(); | |
1da177e4 LT |
343 | } |
344 | } | |
345 | ||
52fc0b02 BM |
346 | /* Free the input parameter list (if we created one) */ |
347 | ||
1da177e4 | 348 | if (info.parameters) { |
52fc0b02 | 349 | |
1da177e4 LT |
350 | /* Free the allocated parameter block */ |
351 | ||
4be44fcd | 352 | acpi_ut_delete_internal_object_list(info.parameters); |
1da177e4 LT |
353 | } |
354 | ||
4be44fcd | 355 | return_ACPI_STATUS(status); |
1da177e4 | 356 | } |
1da177e4 | 357 | |
8313524a | 358 | ACPI_EXPORT_SYMBOL(acpi_evaluate_object) |
1da177e4 LT |
359 | |
360 | /******************************************************************************* | |
361 | * | |
362 | * FUNCTION: acpi_walk_namespace | |
363 | * | |
364 | * PARAMETERS: Type - acpi_object_type to search for | |
365 | * start_object - Handle in namespace where search begins | |
366 | * max_depth - Depth to which search is to reach | |
367 | * user_function - Called when an object of "Type" is found | |
368 | * Context - Passed to user function | |
369 | * return_value - Location where return value of | |
370 | * user_function is put if terminated early | |
371 | * | |
372 | * RETURNS Return value from the user_function if terminated early. | |
373 | * Otherwise, returns NULL. | |
374 | * | |
375 | * DESCRIPTION: Performs a modified depth-first walk of the namespace tree, | |
376 | * starting (and ending) at the object specified by start_handle. | |
377 | * The user_function is called whenever an object that matches | |
378 | * the type parameter is found. If the user function returns | |
379 | * a non-zero value, the search is terminated immediately and this | |
380 | * value is returned to the caller. | |
381 | * | |
382 | * The point of this procedure is to provide a generic namespace | |
383 | * walk routine that can be called from multiple places to | |
384 | * provide multiple services; the User Function can be tailored | |
385 | * to each task, whether it is a print function, a compare | |
386 | * function, etc. | |
387 | * | |
388 | ******************************************************************************/ | |
1da177e4 | 389 | acpi_status |
4be44fcd LB |
390 | acpi_walk_namespace(acpi_object_type type, |
391 | acpi_handle start_object, | |
392 | u32 max_depth, | |
393 | acpi_walk_callback user_function, | |
394 | void *context, void **return_value) | |
1da177e4 | 395 | { |
4be44fcd | 396 | acpi_status status; |
1da177e4 | 397 | |
b229cf92 | 398 | ACPI_FUNCTION_TRACE(acpi_walk_namespace); |
1da177e4 LT |
399 | |
400 | /* Parameter validation */ | |
401 | ||
96db255c | 402 | if ((type > ACPI_TYPE_LOCAL_MAX) || (!max_depth) || (!user_function)) { |
4be44fcd | 403 | return_ACPI_STATUS(AE_BAD_PARAMETER); |
1da177e4 LT |
404 | } |
405 | ||
406 | /* | |
407 | * Lock the namespace around the walk. | |
408 | * The namespace will be unlocked/locked around each call | |
409 | * to the user function - since this function | |
410 | * must be allowed to make Acpi calls itself. | |
411 | */ | |
4be44fcd LB |
412 | status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); |
413 | if (ACPI_FAILURE(status)) { | |
414 | return_ACPI_STATUS(status); | |
1da177e4 LT |
415 | } |
416 | ||
4be44fcd LB |
417 | status = acpi_ns_walk_namespace(type, start_object, max_depth, |
418 | ACPI_NS_WALK_UNLOCK, | |
419 | user_function, context, return_value); | |
1da177e4 | 420 | |
4be44fcd LB |
421 | (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); |
422 | return_ACPI_STATUS(status); | |
1da177e4 | 423 | } |
1da177e4 | 424 | |
8313524a | 425 | ACPI_EXPORT_SYMBOL(acpi_walk_namespace) |
1da177e4 LT |
426 | |
427 | /******************************************************************************* | |
428 | * | |
429 | * FUNCTION: acpi_ns_get_device_callback | |
430 | * | |
431 | * PARAMETERS: Callback from acpi_get_device | |
432 | * | |
433 | * RETURN: Status | |
434 | * | |
435 | * DESCRIPTION: Takes callbacks from walk_namespace and filters out all non- | |
436 | * present devices, or if they specified a HID, it filters based | |
437 | * on that. | |
438 | * | |
439 | ******************************************************************************/ | |
1da177e4 | 440 | static acpi_status |
4be44fcd LB |
441 | acpi_ns_get_device_callback(acpi_handle obj_handle, |
442 | u32 nesting_level, | |
443 | void *context, void **return_value) | |
1da177e4 | 444 | { |
4be44fcd LB |
445 | struct acpi_get_devices_info *info = context; |
446 | acpi_status status; | |
447 | struct acpi_namespace_node *node; | |
448 | u32 flags; | |
449 | struct acpi_device_id hid; | |
1da177e4 | 450 | struct acpi_compatible_id_list *cid; |
4be44fcd | 451 | acpi_native_uint i; |
1da177e4 | 452 | |
4be44fcd LB |
453 | status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); |
454 | if (ACPI_FAILURE(status)) { | |
1da177e4 LT |
455 | return (status); |
456 | } | |
457 | ||
4be44fcd LB |
458 | node = acpi_ns_map_handle_to_node(obj_handle); |
459 | status = acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); | |
460 | if (ACPI_FAILURE(status)) { | |
1da177e4 LT |
461 | return (status); |
462 | } | |
463 | ||
464 | if (!node) { | |
465 | return (AE_BAD_PARAMETER); | |
466 | } | |
467 | ||
468 | /* Run _STA to determine if device is present */ | |
469 | ||
4be44fcd LB |
470 | status = acpi_ut_execute_STA(node, &flags); |
471 | if (ACPI_FAILURE(status)) { | |
1da177e4 LT |
472 | return (AE_CTRL_DEPTH); |
473 | } | |
474 | ||
defba1d8 | 475 | if (!(flags & ACPI_STA_DEVICE_PRESENT)) { |
52fc0b02 | 476 | |
defba1d8 | 477 | /* Don't examine children of the device if not present */ |
1da177e4 LT |
478 | |
479 | return (AE_CTRL_DEPTH); | |
480 | } | |
481 | ||
482 | /* Filter based on device HID & CID */ | |
483 | ||
484 | if (info->hid != NULL) { | |
4be44fcd | 485 | status = acpi_ut_execute_HID(node, &hid); |
1da177e4 LT |
486 | if (status == AE_NOT_FOUND) { |
487 | return (AE_OK); | |
4be44fcd | 488 | } else if (ACPI_FAILURE(status)) { |
1da177e4 LT |
489 | return (AE_CTRL_DEPTH); |
490 | } | |
491 | ||
4be44fcd | 492 | if (ACPI_STRNCMP(hid.value, info->hid, sizeof(hid.value)) != 0) { |
52fc0b02 | 493 | |
1da177e4 LT |
494 | /* Get the list of Compatible IDs */ |
495 | ||
4be44fcd | 496 | status = acpi_ut_execute_CID(node, &cid); |
1da177e4 LT |
497 | if (status == AE_NOT_FOUND) { |
498 | return (AE_OK); | |
4be44fcd | 499 | } else if (ACPI_FAILURE(status)) { |
1da177e4 LT |
500 | return (AE_CTRL_DEPTH); |
501 | } | |
502 | ||
503 | /* Walk the CID list */ | |
504 | ||
505 | for (i = 0; i < cid->count; i++) { | |
4be44fcd LB |
506 | if (ACPI_STRNCMP(cid->id[i].value, info->hid, |
507 | sizeof(struct | |
508 | acpi_compatible_id)) != | |
509 | 0) { | |
8313524a | 510 | ACPI_FREE(cid); |
1da177e4 LT |
511 | return (AE_OK); |
512 | } | |
513 | } | |
8313524a | 514 | ACPI_FREE(cid); |
1da177e4 LT |
515 | } |
516 | } | |
517 | ||
4be44fcd LB |
518 | status = info->user_function(obj_handle, nesting_level, info->context, |
519 | return_value); | |
1da177e4 LT |
520 | return (status); |
521 | } | |
522 | ||
1da177e4 LT |
523 | /******************************************************************************* |
524 | * | |
525 | * FUNCTION: acpi_get_devices | |
526 | * | |
527 | * PARAMETERS: HID - HID to search for. Can be NULL. | |
528 | * user_function - Called when a matching object is found | |
529 | * Context - Passed to user function | |
530 | * return_value - Location where return value of | |
531 | * user_function is put if terminated early | |
532 | * | |
533 | * RETURNS Return value from the user_function if terminated early. | |
534 | * Otherwise, returns NULL. | |
535 | * | |
536 | * DESCRIPTION: Performs a modified depth-first walk of the namespace tree, | |
537 | * starting (and ending) at the object specified by start_handle. | |
538 | * The user_function is called whenever an object of type | |
539 | * Device is found. If the user function returns | |
540 | * a non-zero value, the search is terminated immediately and this | |
541 | * value is returned to the caller. | |
542 | * | |
543 | * This is a wrapper for walk_namespace, but the callback performs | |
544 | * additional filtering. Please see acpi_get_device_callback. | |
545 | * | |
546 | ******************************************************************************/ | |
547 | ||
548 | acpi_status | |
4be44fcd LB |
549 | acpi_get_devices(char *HID, |
550 | acpi_walk_callback user_function, | |
551 | void *context, void **return_value) | |
1da177e4 | 552 | { |
4be44fcd LB |
553 | acpi_status status; |
554 | struct acpi_get_devices_info info; | |
1da177e4 | 555 | |
b229cf92 | 556 | ACPI_FUNCTION_TRACE(acpi_get_devices); |
1da177e4 LT |
557 | |
558 | /* Parameter validation */ | |
559 | ||
560 | if (!user_function) { | |
4be44fcd | 561 | return_ACPI_STATUS(AE_BAD_PARAMETER); |
1da177e4 LT |
562 | } |
563 | ||
564 | /* | |
565 | * We're going to call their callback from OUR callback, so we need | |
566 | * to know what it is, and their context parameter. | |
567 | */ | |
52fc0b02 | 568 | info.hid = HID; |
4be44fcd | 569 | info.context = context; |
1da177e4 | 570 | info.user_function = user_function; |
1da177e4 LT |
571 | |
572 | /* | |
573 | * Lock the namespace around the walk. | |
574 | * The namespace will be unlocked/locked around each call | |
575 | * to the user function - since this function | |
576 | * must be allowed to make Acpi calls itself. | |
577 | */ | |
4be44fcd LB |
578 | status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); |
579 | if (ACPI_FAILURE(status)) { | |
580 | return_ACPI_STATUS(status); | |
1da177e4 LT |
581 | } |
582 | ||
52fc0b02 BM |
583 | status = acpi_ns_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, |
584 | ACPI_UINT32_MAX, ACPI_NS_WALK_UNLOCK, | |
4be44fcd LB |
585 | acpi_ns_get_device_callback, &info, |
586 | return_value); | |
1da177e4 | 587 | |
4be44fcd LB |
588 | (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); |
589 | return_ACPI_STATUS(status); | |
1da177e4 | 590 | } |
1da177e4 | 591 | |
8313524a | 592 | ACPI_EXPORT_SYMBOL(acpi_get_devices) |
1da177e4 LT |
593 | |
594 | /******************************************************************************* | |
595 | * | |
596 | * FUNCTION: acpi_attach_data | |
597 | * | |
598 | * PARAMETERS: obj_handle - Namespace node | |
599 | * Handler - Handler for this attachment | |
600 | * Data - Pointer to data to be attached | |
601 | * | |
602 | * RETURN: Status | |
603 | * | |
604 | * DESCRIPTION: Attach arbitrary data and handler to a namespace node. | |
605 | * | |
606 | ******************************************************************************/ | |
1da177e4 | 607 | acpi_status |
4be44fcd LB |
608 | acpi_attach_data(acpi_handle obj_handle, |
609 | acpi_object_handler handler, void *data) | |
1da177e4 | 610 | { |
4be44fcd LB |
611 | struct acpi_namespace_node *node; |
612 | acpi_status status; | |
1da177e4 LT |
613 | |
614 | /* Parameter validation */ | |
615 | ||
4be44fcd | 616 | if (!obj_handle || !handler || !data) { |
1da177e4 LT |
617 | return (AE_BAD_PARAMETER); |
618 | } | |
619 | ||
4be44fcd LB |
620 | status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); |
621 | if (ACPI_FAILURE(status)) { | |
1da177e4 LT |
622 | return (status); |
623 | } | |
624 | ||
625 | /* Convert and validate the handle */ | |
626 | ||
4be44fcd | 627 | node = acpi_ns_map_handle_to_node(obj_handle); |
1da177e4 LT |
628 | if (!node) { |
629 | status = AE_BAD_PARAMETER; | |
630 | goto unlock_and_exit; | |
631 | } | |
632 | ||
4be44fcd | 633 | status = acpi_ns_attach_data(node, handler, data); |
1da177e4 | 634 | |
4be44fcd LB |
635 | unlock_and_exit: |
636 | (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); | |
1da177e4 LT |
637 | return (status); |
638 | } | |
639 | ||
8313524a BM |
640 | ACPI_EXPORT_SYMBOL(acpi_attach_data) |
641 | ||
1da177e4 LT |
642 | /******************************************************************************* |
643 | * | |
644 | * FUNCTION: acpi_detach_data | |
645 | * | |
646 | * PARAMETERS: obj_handle - Namespace node handle | |
647 | * Handler - Handler used in call to acpi_attach_data | |
648 | * | |
649 | * RETURN: Status | |
650 | * | |
651 | * DESCRIPTION: Remove data that was previously attached to a node. | |
652 | * | |
653 | ******************************************************************************/ | |
1da177e4 | 654 | acpi_status |
4be44fcd | 655 | acpi_detach_data(acpi_handle obj_handle, acpi_object_handler handler) |
1da177e4 | 656 | { |
4be44fcd LB |
657 | struct acpi_namespace_node *node; |
658 | acpi_status status; | |
1da177e4 LT |
659 | |
660 | /* Parameter validation */ | |
661 | ||
4be44fcd | 662 | if (!obj_handle || !handler) { |
1da177e4 LT |
663 | return (AE_BAD_PARAMETER); |
664 | } | |
665 | ||
4be44fcd LB |
666 | status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); |
667 | if (ACPI_FAILURE(status)) { | |
1da177e4 LT |
668 | return (status); |
669 | } | |
670 | ||
671 | /* Convert and validate the handle */ | |
672 | ||
4be44fcd | 673 | node = acpi_ns_map_handle_to_node(obj_handle); |
1da177e4 LT |
674 | if (!node) { |
675 | status = AE_BAD_PARAMETER; | |
676 | goto unlock_and_exit; | |
677 | } | |
678 | ||
4be44fcd | 679 | status = acpi_ns_detach_data(node, handler); |
1da177e4 | 680 | |
4be44fcd LB |
681 | unlock_and_exit: |
682 | (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); | |
1da177e4 LT |
683 | return (status); |
684 | } | |
685 | ||
8313524a BM |
686 | ACPI_EXPORT_SYMBOL(acpi_detach_data) |
687 | ||
1da177e4 LT |
688 | /******************************************************************************* |
689 | * | |
690 | * FUNCTION: acpi_get_data | |
691 | * | |
692 | * PARAMETERS: obj_handle - Namespace node | |
693 | * Handler - Handler used in call to attach_data | |
694 | * Data - Where the data is returned | |
695 | * | |
696 | * RETURN: Status | |
697 | * | |
698 | * DESCRIPTION: Retrieve data that was previously attached to a namespace node. | |
699 | * | |
700 | ******************************************************************************/ | |
1da177e4 | 701 | acpi_status |
4be44fcd | 702 | acpi_get_data(acpi_handle obj_handle, acpi_object_handler handler, void **data) |
1da177e4 | 703 | { |
4be44fcd LB |
704 | struct acpi_namespace_node *node; |
705 | acpi_status status; | |
1da177e4 LT |
706 | |
707 | /* Parameter validation */ | |
708 | ||
4be44fcd | 709 | if (!obj_handle || !handler || !data) { |
1da177e4 LT |
710 | return (AE_BAD_PARAMETER); |
711 | } | |
712 | ||
4be44fcd LB |
713 | status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); |
714 | if (ACPI_FAILURE(status)) { | |
1da177e4 LT |
715 | return (status); |
716 | } | |
717 | ||
718 | /* Convert and validate the handle */ | |
719 | ||
4be44fcd | 720 | node = acpi_ns_map_handle_to_node(obj_handle); |
1da177e4 LT |
721 | if (!node) { |
722 | status = AE_BAD_PARAMETER; | |
723 | goto unlock_and_exit; | |
724 | } | |
725 | ||
4be44fcd | 726 | status = acpi_ns_get_attached_data(node, handler, data); |
1da177e4 | 727 | |
4be44fcd LB |
728 | unlock_and_exit: |
729 | (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); | |
1da177e4 LT |
730 | return (status); |
731 | } | |
8313524a BM |
732 | |
733 | ACPI_EXPORT_SYMBOL(acpi_get_data) |