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1da177e4 LT |
1 | /******************************************************************************* |
2 | * | |
3 | * Module Name: rsxface - Public interfaces to the resource manager | |
4 | * | |
5 | ******************************************************************************/ | |
6 | ||
7 | /* | |
6c9deb72 | 8 | * Copyright (C) 2000 - 2007, R. Byron Moore |
1da177e4 LT |
9 | * All rights reserved. |
10 | * | |
11 | * Redistribution and use in source and binary forms, with or without | |
12 | * modification, are permitted provided that the following conditions | |
13 | * are met: | |
14 | * 1. Redistributions of source code must retain the above copyright | |
15 | * notice, this list of conditions, and the following disclaimer, | |
16 | * without modification. | |
17 | * 2. Redistributions in binary form must reproduce at minimum a disclaimer | |
18 | * substantially similar to the "NO WARRANTY" disclaimer below | |
19 | * ("Disclaimer") and any redistribution must be conditioned upon | |
20 | * including a substantially similar Disclaimer requirement for further | |
21 | * binary redistribution. | |
22 | * 3. Neither the names of the above-listed copyright holders nor the names | |
23 | * of any contributors may be used to endorse or promote products derived | |
24 | * from this software without specific prior written permission. | |
25 | * | |
26 | * Alternatively, this software may be distributed under the terms of the | |
27 | * GNU General Public License ("GPL") version 2 as published by the Free | |
28 | * Software Foundation. | |
29 | * | |
30 | * NO WARRANTY | |
31 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
32 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
33 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR | |
34 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |
35 | * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
36 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
37 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
38 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, | |
39 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING | |
40 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | |
41 | * POSSIBILITY OF SUCH DAMAGES. | |
42 | */ | |
43 | ||
1da177e4 LT |
44 | #include <acpi/acpi.h> |
45 | #include <acpi/acresrc.h> | |
4119532c | 46 | #include <acpi/acnamesp.h> |
1da177e4 LT |
47 | |
48 | #define _COMPONENT ACPI_RESOURCES | |
4be44fcd | 49 | ACPI_MODULE_NAME("rsxface") |
1da177e4 | 50 | |
44f6c012 | 51 | /* Local macros for 16,32-bit to 64-bit conversion */ |
44f6c012 RM |
52 | #define ACPI_COPY_FIELD(out, in, field) ((out)->field = (in)->field) |
53 | #define ACPI_COPY_ADDRESS(out, in) \ | |
54 | ACPI_COPY_FIELD(out, in, resource_type); \ | |
55 | ACPI_COPY_FIELD(out, in, producer_consumer); \ | |
56 | ACPI_COPY_FIELD(out, in, decode); \ | |
57 | ACPI_COPY_FIELD(out, in, min_address_fixed); \ | |
58 | ACPI_COPY_FIELD(out, in, max_address_fixed); \ | |
0897831b | 59 | ACPI_COPY_FIELD(out, in, info); \ |
44f6c012 | 60 | ACPI_COPY_FIELD(out, in, granularity); \ |
50eca3eb BM |
61 | ACPI_COPY_FIELD(out, in, minimum); \ |
62 | ACPI_COPY_FIELD(out, in, maximum); \ | |
63 | ACPI_COPY_FIELD(out, in, translation_offset); \ | |
44f6c012 RM |
64 | ACPI_COPY_FIELD(out, in, address_length); \ |
65 | ACPI_COPY_FIELD(out, in, resource_source); | |
c51a4de8 BM |
66 | /* Local prototypes */ |
67 | static acpi_status | |
68 | acpi_rs_match_vendor_resource(struct acpi_resource *resource, void *context); | |
69 | ||
4119532c BM |
70 | static acpi_status |
71 | acpi_rs_validate_parameters(acpi_handle device_handle, | |
72 | struct acpi_buffer *buffer, | |
73 | struct acpi_namespace_node **return_node); | |
74 | ||
75 | /******************************************************************************* | |
76 | * | |
77 | * FUNCTION: acpi_rs_validate_parameters | |
78 | * | |
79 | * PARAMETERS: device_handle - Handle to a device | |
80 | * Buffer - Pointer to a data buffer | |
81 | * return_node - Pointer to where the device node is returned | |
82 | * | |
83 | * RETURN: Status | |
84 | * | |
85 | * DESCRIPTION: Common parameter validation for resource interfaces | |
86 | * | |
87 | ******************************************************************************/ | |
88 | ||
89 | static acpi_status | |
90 | acpi_rs_validate_parameters(acpi_handle device_handle, | |
91 | struct acpi_buffer *buffer, | |
92 | struct acpi_namespace_node **return_node) | |
93 | { | |
94 | acpi_status status; | |
95 | struct acpi_namespace_node *node; | |
96 | ||
97 | ACPI_FUNCTION_TRACE(rs_validate_parameters); | |
98 | ||
99 | /* | |
100 | * Must have a valid handle to an ACPI device | |
101 | */ | |
102 | if (!device_handle) { | |
103 | return_ACPI_STATUS(AE_BAD_PARAMETER); | |
104 | } | |
105 | ||
106 | node = acpi_ns_map_handle_to_node(device_handle); | |
107 | if (!node) { | |
108 | return_ACPI_STATUS(AE_BAD_PARAMETER); | |
109 | } | |
110 | ||
111 | if (node->type != ACPI_TYPE_DEVICE) { | |
112 | return_ACPI_STATUS(AE_TYPE); | |
113 | } | |
114 | ||
115 | /* | |
116 | * Validate the user buffer object | |
117 | * | |
118 | * if there is a non-zero buffer length we also need a valid pointer in | |
119 | * the buffer. If it's a zero buffer length, we'll be returning the | |
120 | * needed buffer size (later), so keep going. | |
121 | */ | |
122 | status = acpi_ut_validate_buffer(buffer); | |
123 | if (ACPI_FAILURE(status)) { | |
124 | return_ACPI_STATUS(status); | |
125 | } | |
126 | ||
127 | *return_node = node; | |
128 | return_ACPI_STATUS(AE_OK); | |
129 | } | |
130 | ||
1da177e4 LT |
131 | /******************************************************************************* |
132 | * | |
133 | * FUNCTION: acpi_get_irq_routing_table | |
134 | * | |
4119532c BM |
135 | * PARAMETERS: device_handle - Handle to the Bus device we are querying |
136 | * ret_buffer - Pointer to a buffer to receive the | |
1da177e4 LT |
137 | * current resources for the device |
138 | * | |
139 | * RETURN: Status | |
140 | * | |
141 | * DESCRIPTION: This function is called to get the IRQ routing table for a | |
4119532c BM |
142 | * specific bus. The caller must first acquire a handle for the |
143 | * desired bus. The routine table is placed in the buffer pointed | |
1da177e4 LT |
144 | * to by the ret_buffer variable parameter. |
145 | * | |
146 | * If the function fails an appropriate status will be returned | |
147 | * and the value of ret_buffer is undefined. | |
148 | * | |
149 | * This function attempts to execute the _PRT method contained in | |
150 | * the object indicated by the passed device_handle. | |
151 | * | |
152 | ******************************************************************************/ | |
c51a4de8 | 153 | |
1da177e4 | 154 | acpi_status |
4be44fcd LB |
155 | acpi_get_irq_routing_table(acpi_handle device_handle, |
156 | struct acpi_buffer *ret_buffer) | |
1da177e4 | 157 | { |
4be44fcd | 158 | acpi_status status; |
4119532c | 159 | struct acpi_namespace_node *node; |
1da177e4 | 160 | |
b229cf92 | 161 | ACPI_FUNCTION_TRACE(acpi_get_irq_routing_table); |
1da177e4 | 162 | |
4119532c | 163 | /* Validate parameters then dispatch to internal routine */ |
1da177e4 | 164 | |
4119532c | 165 | status = acpi_rs_validate_parameters(device_handle, ret_buffer, &node); |
4be44fcd LB |
166 | if (ACPI_FAILURE(status)) { |
167 | return_ACPI_STATUS(status); | |
1da177e4 LT |
168 | } |
169 | ||
4119532c | 170 | status = acpi_rs_get_prt_method_data(node, ret_buffer); |
4be44fcd | 171 | return_ACPI_STATUS(status); |
1da177e4 LT |
172 | } |
173 | ||
8313524a BM |
174 | ACPI_EXPORT_SYMBOL(acpi_get_irq_routing_table) |
175 | ||
1da177e4 LT |
176 | /******************************************************************************* |
177 | * | |
178 | * FUNCTION: acpi_get_current_resources | |
179 | * | |
4119532c | 180 | * PARAMETERS: device_handle - Handle to the device object for the |
1da177e4 | 181 | * device we are querying |
4119532c | 182 | * ret_buffer - Pointer to a buffer to receive the |
1da177e4 LT |
183 | * current resources for the device |
184 | * | |
185 | * RETURN: Status | |
186 | * | |
187 | * DESCRIPTION: This function is called to get the current resources for a | |
4119532c BM |
188 | * specific device. The caller must first acquire a handle for |
189 | * the desired device. The resource data is placed in the buffer | |
1da177e4 LT |
190 | * pointed to by the ret_buffer variable parameter. |
191 | * | |
192 | * If the function fails an appropriate status will be returned | |
193 | * and the value of ret_buffer is undefined. | |
194 | * | |
195 | * This function attempts to execute the _CRS method contained in | |
196 | * the object indicated by the passed device_handle. | |
197 | * | |
198 | ******************************************************************************/ | |
1da177e4 | 199 | acpi_status |
4be44fcd LB |
200 | acpi_get_current_resources(acpi_handle device_handle, |
201 | struct acpi_buffer *ret_buffer) | |
1da177e4 | 202 | { |
4be44fcd | 203 | acpi_status status; |
4119532c | 204 | struct acpi_namespace_node *node; |
1da177e4 | 205 | |
b229cf92 | 206 | ACPI_FUNCTION_TRACE(acpi_get_current_resources); |
1da177e4 | 207 | |
4119532c | 208 | /* Validate parameters then dispatch to internal routine */ |
1da177e4 | 209 | |
4119532c | 210 | status = acpi_rs_validate_parameters(device_handle, ret_buffer, &node); |
4be44fcd LB |
211 | if (ACPI_FAILURE(status)) { |
212 | return_ACPI_STATUS(status); | |
1da177e4 LT |
213 | } |
214 | ||
4119532c | 215 | status = acpi_rs_get_crs_method_data(node, ret_buffer); |
4be44fcd | 216 | return_ACPI_STATUS(status); |
1da177e4 | 217 | } |
1da177e4 | 218 | |
8313524a | 219 | ACPI_EXPORT_SYMBOL(acpi_get_current_resources) |
8313524a | 220 | #ifdef ACPI_FUTURE_USAGE |
1da177e4 LT |
221 | /******************************************************************************* |
222 | * | |
223 | * FUNCTION: acpi_get_possible_resources | |
224 | * | |
4119532c | 225 | * PARAMETERS: device_handle - Handle to the device object for the |
1da177e4 | 226 | * device we are querying |
4119532c | 227 | * ret_buffer - Pointer to a buffer to receive the |
1da177e4 LT |
228 | * resources for the device |
229 | * | |
230 | * RETURN: Status | |
231 | * | |
232 | * DESCRIPTION: This function is called to get a list of the possible resources | |
4119532c BM |
233 | * for a specific device. The caller must first acquire a handle |
234 | * for the desired device. The resource data is placed in the | |
1da177e4 LT |
235 | * buffer pointed to by the ret_buffer variable. |
236 | * | |
237 | * If the function fails an appropriate status will be returned | |
238 | * and the value of ret_buffer is undefined. | |
239 | * | |
240 | ******************************************************************************/ | |
1da177e4 | 241 | acpi_status |
4be44fcd LB |
242 | acpi_get_possible_resources(acpi_handle device_handle, |
243 | struct acpi_buffer *ret_buffer) | |
1da177e4 | 244 | { |
4be44fcd | 245 | acpi_status status; |
4119532c | 246 | struct acpi_namespace_node *node; |
1da177e4 | 247 | |
b229cf92 | 248 | ACPI_FUNCTION_TRACE(acpi_get_possible_resources); |
1da177e4 | 249 | |
4119532c | 250 | /* Validate parameters then dispatch to internal routine */ |
1da177e4 | 251 | |
4119532c | 252 | status = acpi_rs_validate_parameters(device_handle, ret_buffer, &node); |
4be44fcd LB |
253 | if (ACPI_FAILURE(status)) { |
254 | return_ACPI_STATUS(status); | |
1da177e4 LT |
255 | } |
256 | ||
4119532c | 257 | status = acpi_rs_get_prs_method_data(node, ret_buffer); |
4be44fcd | 258 | return_ACPI_STATUS(status); |
1da177e4 | 259 | } |
1da177e4 | 260 | |
8313524a | 261 | ACPI_EXPORT_SYMBOL(acpi_get_possible_resources) |
4be44fcd | 262 | #endif /* ACPI_FUTURE_USAGE */ |
1da177e4 LT |
263 | /******************************************************************************* |
264 | * | |
265 | * FUNCTION: acpi_set_current_resources | |
266 | * | |
4119532c BM |
267 | * PARAMETERS: device_handle - Handle to the device object for the |
268 | * device we are setting resources | |
269 | * in_buffer - Pointer to a buffer containing the | |
1da177e4 LT |
270 | * resources to be set for the device |
271 | * | |
272 | * RETURN: Status | |
273 | * | |
274 | * DESCRIPTION: This function is called to set the current resources for a | |
4119532c BM |
275 | * specific device. The caller must first acquire a handle for |
276 | * the desired device. The resource data is passed to the routine | |
1da177e4 LT |
277 | * the buffer pointed to by the in_buffer variable. |
278 | * | |
279 | ******************************************************************************/ | |
1da177e4 | 280 | acpi_status |
4be44fcd LB |
281 | acpi_set_current_resources(acpi_handle device_handle, |
282 | struct acpi_buffer *in_buffer) | |
1da177e4 | 283 | { |
4be44fcd | 284 | acpi_status status; |
4119532c | 285 | struct acpi_namespace_node *node; |
1da177e4 | 286 | |
b229cf92 | 287 | ACPI_FUNCTION_TRACE(acpi_set_current_resources); |
1da177e4 | 288 | |
4119532c | 289 | /* Validate the buffer, don't allow zero length */ |
44f6c012 | 290 | |
4119532c | 291 | if ((!in_buffer) || (!in_buffer->pointer) || (!in_buffer->length)) { |
4be44fcd | 292 | return_ACPI_STATUS(AE_BAD_PARAMETER); |
1da177e4 LT |
293 | } |
294 | ||
4119532c BM |
295 | /* Validate parameters then dispatch to internal routine */ |
296 | ||
297 | status = acpi_rs_validate_parameters(device_handle, in_buffer, &node); | |
298 | if (ACPI_FAILURE(status)) { | |
299 | return_ACPI_STATUS(status); | |
300 | } | |
301 | ||
302 | status = acpi_rs_set_srs_method_data(node, in_buffer); | |
4be44fcd | 303 | return_ACPI_STATUS(status); |
1da177e4 | 304 | } |
1da177e4 | 305 | |
8313524a | 306 | ACPI_EXPORT_SYMBOL(acpi_set_current_resources) |
1da177e4 | 307 | |
1da177e4 LT |
308 | /****************************************************************************** |
309 | * | |
310 | * FUNCTION: acpi_resource_to_address64 | |
311 | * | |
4119532c BM |
312 | * PARAMETERS: Resource - Pointer to a resource |
313 | * Out - Pointer to the users's return buffer | |
314 | * (a struct acpi_resource_address64) | |
1da177e4 LT |
315 | * |
316 | * RETURN: Status | |
317 | * | |
318 | * DESCRIPTION: If the resource is an address16, address32, or address64, | |
4119532c | 319 | * copy it to the address64 return buffer. This saves the |
1da177e4 LT |
320 | * caller from having to duplicate code for different-sized |
321 | * addresses. | |
322 | * | |
323 | ******************************************************************************/ | |
1da177e4 | 324 | acpi_status |
4be44fcd LB |
325 | acpi_resource_to_address64(struct acpi_resource *resource, |
326 | struct acpi_resource_address64 *out) | |
1da177e4 | 327 | { |
4be44fcd LB |
328 | struct acpi_resource_address16 *address16; |
329 | struct acpi_resource_address32 *address32; | |
1da177e4 | 330 | |
c51a4de8 BM |
331 | if (!resource || !out) { |
332 | return (AE_BAD_PARAMETER); | |
333 | } | |
334 | ||
335 | /* Convert 16 or 32 address descriptor to 64 */ | |
336 | ||
bda663d3 | 337 | switch (resource->type) { |
50eca3eb | 338 | case ACPI_RESOURCE_TYPE_ADDRESS16: |
1da177e4 | 339 | |
4be44fcd LB |
340 | address16 = (struct acpi_resource_address16 *)&resource->data; |
341 | ACPI_COPY_ADDRESS(out, address16); | |
1da177e4 LT |
342 | break; |
343 | ||
50eca3eb | 344 | case ACPI_RESOURCE_TYPE_ADDRESS32: |
1da177e4 | 345 | |
4be44fcd LB |
346 | address32 = (struct acpi_resource_address32 *)&resource->data; |
347 | ACPI_COPY_ADDRESS(out, address32); | |
1da177e4 LT |
348 | break; |
349 | ||
50eca3eb | 350 | case ACPI_RESOURCE_TYPE_ADDRESS64: |
1da177e4 LT |
351 | |
352 | /* Simple copy for 64 bit source */ | |
353 | ||
4be44fcd LB |
354 | ACPI_MEMCPY(out, &resource->data, |
355 | sizeof(struct acpi_resource_address64)); | |
1da177e4 LT |
356 | break; |
357 | ||
1da177e4 LT |
358 | default: |
359 | return (AE_BAD_PARAMETER); | |
360 | } | |
361 | ||
362 | return (AE_OK); | |
363 | } | |
4be44fcd | 364 | |
8313524a | 365 | ACPI_EXPORT_SYMBOL(acpi_resource_to_address64) |
c51a4de8 BM |
366 | |
367 | /******************************************************************************* | |
368 | * | |
369 | * FUNCTION: acpi_get_vendor_resource | |
370 | * | |
4119532c BM |
371 | * PARAMETERS: device_handle - Handle for the parent device object |
372 | * Name - Method name for the parent resource | |
373 | * (METHOD_NAME__CRS or METHOD_NAME__PRS) | |
374 | * Uuid - Pointer to the UUID to be matched. | |
375 | * includes both subtype and 16-byte UUID | |
376 | * ret_buffer - Where the vendor resource is returned | |
c51a4de8 BM |
377 | * |
378 | * RETURN: Status | |
379 | * | |
380 | * DESCRIPTION: Walk a resource template for the specified evice to find a | |
381 | * vendor-defined resource that matches the supplied UUID and | |
382 | * UUID subtype. Returns a struct acpi_resource of type Vendor. | |
383 | * | |
384 | ******************************************************************************/ | |
c51a4de8 BM |
385 | acpi_status |
386 | acpi_get_vendor_resource(acpi_handle device_handle, | |
387 | char *name, | |
388 | struct acpi_vendor_uuid * uuid, | |
389 | struct acpi_buffer * ret_buffer) | |
390 | { | |
391 | struct acpi_vendor_walk_info info; | |
392 | acpi_status status; | |
393 | ||
394 | /* Other parameters are validated by acpi_walk_resources */ | |
395 | ||
396 | if (!uuid || !ret_buffer) { | |
397 | return (AE_BAD_PARAMETER); | |
398 | } | |
399 | ||
400 | info.uuid = uuid; | |
401 | info.buffer = ret_buffer; | |
402 | info.status = AE_NOT_EXIST; | |
403 | ||
404 | /* Walk the _CRS or _PRS resource list for this device */ | |
405 | ||
406 | status = | |
407 | acpi_walk_resources(device_handle, name, | |
408 | acpi_rs_match_vendor_resource, &info); | |
409 | if (ACPI_FAILURE(status)) { | |
410 | return (status); | |
411 | } | |
412 | ||
413 | return (info.status); | |
414 | } | |
415 | ||
8313524a BM |
416 | ACPI_EXPORT_SYMBOL(acpi_get_vendor_resource) |
417 | ||
c51a4de8 BM |
418 | /******************************************************************************* |
419 | * | |
420 | * FUNCTION: acpi_rs_match_vendor_resource | |
421 | * | |
61686124 | 422 | * PARAMETERS: acpi_walk_resource_callback |
c51a4de8 BM |
423 | * |
424 | * RETURN: Status | |
425 | * | |
426 | * DESCRIPTION: Match a vendor resource via the ACPI 3.0 UUID | |
427 | * | |
428 | ******************************************************************************/ | |
c51a4de8 BM |
429 | static acpi_status |
430 | acpi_rs_match_vendor_resource(struct acpi_resource *resource, void *context) | |
431 | { | |
432 | struct acpi_vendor_walk_info *info = context; | |
433 | struct acpi_resource_vendor_typed *vendor; | |
434 | struct acpi_buffer *buffer; | |
435 | acpi_status status; | |
436 | ||
437 | /* Ignore all descriptors except Vendor */ | |
438 | ||
439 | if (resource->type != ACPI_RESOURCE_TYPE_VENDOR) { | |
440 | return (AE_OK); | |
441 | } | |
442 | ||
443 | vendor = &resource->data.vendor_typed; | |
444 | ||
445 | /* | |
446 | * For a valid match, these conditions must hold: | |
447 | * | |
448 | * 1) Length of descriptor data must be at least as long as a UUID struct | |
449 | * 2) The UUID subtypes must match | |
450 | * 3) The UUID data must match | |
451 | */ | |
452 | if ((vendor->byte_length < (ACPI_UUID_LENGTH + 1)) || | |
453 | (vendor->uuid_subtype != info->uuid->subtype) || | |
454 | (ACPI_MEMCMP(vendor->uuid, info->uuid->data, ACPI_UUID_LENGTH))) { | |
455 | return (AE_OK); | |
456 | } | |
457 | ||
458 | /* Validate/Allocate/Clear caller buffer */ | |
459 | ||
460 | buffer = info->buffer; | |
461 | status = acpi_ut_initialize_buffer(buffer, resource->length); | |
462 | if (ACPI_FAILURE(status)) { | |
463 | return (status); | |
464 | } | |
465 | ||
466 | /* Found the correct resource, copy and return it */ | |
467 | ||
468 | ACPI_MEMCPY(buffer->pointer, resource, resource->length); | |
469 | buffer->length = resource->length; | |
470 | ||
471 | /* Found the desired descriptor, terminate resource walk */ | |
472 | ||
473 | info->status = AE_OK; | |
474 | return (AE_CTRL_TERMINATE); | |
475 | } | |
8313524a BM |
476 | |
477 | ACPI_EXPORT_SYMBOL(acpi_rs_match_vendor_resource) | |
4119532c BM |
478 | |
479 | /******************************************************************************* | |
480 | * | |
481 | * FUNCTION: acpi_walk_resources | |
482 | * | |
483 | * PARAMETERS: device_handle - Handle to the device object for the | |
484 | * device we are querying | |
485 | * Name - Method name of the resources we want | |
486 | * (METHOD_NAME__CRS or METHOD_NAME__PRS) | |
487 | * user_function - Called for each resource | |
488 | * Context - Passed to user_function | |
489 | * | |
490 | * RETURN: Status | |
491 | * | |
492 | * DESCRIPTION: Retrieves the current or possible resource list for the | |
493 | * specified device. The user_function is called once for | |
494 | * each resource in the list. | |
495 | * | |
496 | ******************************************************************************/ | |
4119532c BM |
497 | acpi_status |
498 | acpi_walk_resources(acpi_handle device_handle, | |
499 | char *name, | |
500 | acpi_walk_resource_callback user_function, void *context) | |
501 | { | |
502 | acpi_status status; | |
503 | struct acpi_buffer buffer; | |
504 | struct acpi_resource *resource; | |
505 | struct acpi_resource *resource_end; | |
506 | ||
507 | ACPI_FUNCTION_TRACE(acpi_walk_resources); | |
508 | ||
509 | /* Parameter validation */ | |
510 | ||
511 | if (!device_handle || !user_function || !name || | |
512 | (!ACPI_COMPARE_NAME(name, METHOD_NAME__CRS) && | |
513 | !ACPI_COMPARE_NAME(name, METHOD_NAME__PRS))) { | |
514 | return_ACPI_STATUS(AE_BAD_PARAMETER); | |
515 | } | |
516 | ||
517 | /* Get the _CRS or _PRS resource list */ | |
518 | ||
519 | buffer.length = ACPI_ALLOCATE_LOCAL_BUFFER; | |
520 | status = acpi_rs_get_method_data(device_handle, name, &buffer); | |
521 | if (ACPI_FAILURE(status)) { | |
522 | return_ACPI_STATUS(status); | |
523 | } | |
524 | ||
525 | /* Buffer now contains the resource list */ | |
526 | ||
527 | resource = ACPI_CAST_PTR(struct acpi_resource, buffer.pointer); | |
528 | resource_end = | |
529 | ACPI_ADD_PTR(struct acpi_resource, buffer.pointer, buffer.length); | |
530 | ||
531 | /* Walk the resource list until the end_tag is found (or buffer end) */ | |
532 | ||
533 | while (resource < resource_end) { | |
534 | ||
535 | /* Sanity check the resource */ | |
536 | ||
537 | if (resource->type > ACPI_RESOURCE_TYPE_MAX) { | |
538 | status = AE_AML_INVALID_RESOURCE_TYPE; | |
539 | break; | |
540 | } | |
541 | ||
542 | /* Invoke the user function, abort on any error returned */ | |
543 | ||
544 | status = user_function(resource, context); | |
545 | if (ACPI_FAILURE(status)) { | |
546 | if (status == AE_CTRL_TERMINATE) { | |
547 | ||
548 | /* This is an OK termination by the user function */ | |
549 | ||
550 | status = AE_OK; | |
551 | } | |
552 | break; | |
553 | } | |
554 | ||
555 | /* end_tag indicates end-of-list */ | |
556 | ||
557 | if (resource->type == ACPI_RESOURCE_TYPE_END_TAG) { | |
558 | break; | |
559 | } | |
560 | ||
561 | /* Get the next resource descriptor */ | |
562 | ||
563 | resource = | |
564 | ACPI_ADD_PTR(struct acpi_resource, resource, | |
565 | resource->length); | |
566 | } | |
567 | ||
568 | ACPI_FREE(buffer.pointer); | |
569 | return_ACPI_STATUS(status); | |
570 | } | |
571 | ||
572 | ACPI_EXPORT_SYMBOL(acpi_walk_resources) |