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1da177e4 LT |
1 | /******************************************************************************* |
2 | * | |
3 | * Module Name: rsxface - Public interfaces to the resource manager | |
4 | * | |
5 | ******************************************************************************/ | |
6 | ||
7 | /* | |
75a44ce0 | 8 | * Copyright (C) 2000 - 2008, Intel Corp. |
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 | 44 | #include <acpi/acpi.h> |
e2f7a777 LB |
45 | #include "accommon.h" |
46 | #include "acresrc.h" | |
47 | #include "acnamesp.h" | |
1da177e4 LT |
48 | |
49 | #define _COMPONENT ACPI_RESOURCES | |
4be44fcd | 50 | ACPI_MODULE_NAME("rsxface") |
1da177e4 | 51 | |
44f6c012 | 52 | /* Local macros for 16,32-bit to 64-bit conversion */ |
44f6c012 RM |
53 | #define ACPI_COPY_FIELD(out, in, field) ((out)->field = (in)->field) |
54 | #define ACPI_COPY_ADDRESS(out, in) \ | |
55 | ACPI_COPY_FIELD(out, in, resource_type); \ | |
56 | ACPI_COPY_FIELD(out, in, producer_consumer); \ | |
57 | ACPI_COPY_FIELD(out, in, decode); \ | |
58 | ACPI_COPY_FIELD(out, in, min_address_fixed); \ | |
59 | ACPI_COPY_FIELD(out, in, max_address_fixed); \ | |
0897831b | 60 | ACPI_COPY_FIELD(out, in, info); \ |
44f6c012 | 61 | ACPI_COPY_FIELD(out, in, granularity); \ |
50eca3eb BM |
62 | ACPI_COPY_FIELD(out, in, minimum); \ |
63 | ACPI_COPY_FIELD(out, in, maximum); \ | |
64 | ACPI_COPY_FIELD(out, in, translation_offset); \ | |
44f6c012 RM |
65 | ACPI_COPY_FIELD(out, in, address_length); \ |
66 | ACPI_COPY_FIELD(out, in, resource_source); | |
c51a4de8 BM |
67 | /* Local prototypes */ |
68 | static acpi_status | |
69 | acpi_rs_match_vendor_resource(struct acpi_resource *resource, void *context); | |
70 | ||
4119532c BM |
71 | static acpi_status |
72 | acpi_rs_validate_parameters(acpi_handle device_handle, | |
73 | struct acpi_buffer *buffer, | |
74 | struct acpi_namespace_node **return_node); | |
75 | ||
76 | /******************************************************************************* | |
77 | * | |
78 | * FUNCTION: acpi_rs_validate_parameters | |
79 | * | |
80 | * PARAMETERS: device_handle - Handle to a device | |
81 | * Buffer - Pointer to a data buffer | |
82 | * return_node - Pointer to where the device node is returned | |
83 | * | |
84 | * RETURN: Status | |
85 | * | |
86 | * DESCRIPTION: Common parameter validation for resource interfaces | |
87 | * | |
88 | ******************************************************************************/ | |
89 | ||
90 | static acpi_status | |
91 | acpi_rs_validate_parameters(acpi_handle device_handle, | |
92 | struct acpi_buffer *buffer, | |
93 | struct acpi_namespace_node **return_node) | |
94 | { | |
95 | acpi_status status; | |
96 | struct acpi_namespace_node *node; | |
97 | ||
98 | ACPI_FUNCTION_TRACE(rs_validate_parameters); | |
99 | ||
100 | /* | |
101 | * Must have a valid handle to an ACPI device | |
102 | */ | |
103 | if (!device_handle) { | |
104 | return_ACPI_STATUS(AE_BAD_PARAMETER); | |
105 | } | |
106 | ||
107 | node = acpi_ns_map_handle_to_node(device_handle); | |
108 | if (!node) { | |
109 | return_ACPI_STATUS(AE_BAD_PARAMETER); | |
110 | } | |
111 | ||
112 | if (node->type != ACPI_TYPE_DEVICE) { | |
113 | return_ACPI_STATUS(AE_TYPE); | |
114 | } | |
115 | ||
116 | /* | |
117 | * Validate the user buffer object | |
118 | * | |
119 | * if there is a non-zero buffer length we also need a valid pointer in | |
120 | * the buffer. If it's a zero buffer length, we'll be returning the | |
121 | * needed buffer size (later), so keep going. | |
122 | */ | |
123 | status = acpi_ut_validate_buffer(buffer); | |
124 | if (ACPI_FAILURE(status)) { | |
125 | return_ACPI_STATUS(status); | |
126 | } | |
127 | ||
128 | *return_node = node; | |
129 | return_ACPI_STATUS(AE_OK); | |
130 | } | |
131 | ||
1da177e4 LT |
132 | /******************************************************************************* |
133 | * | |
134 | * FUNCTION: acpi_get_irq_routing_table | |
135 | * | |
4119532c BM |
136 | * PARAMETERS: device_handle - Handle to the Bus device we are querying |
137 | * ret_buffer - Pointer to a buffer to receive the | |
1da177e4 LT |
138 | * current resources for the device |
139 | * | |
140 | * RETURN: Status | |
141 | * | |
142 | * DESCRIPTION: This function is called to get the IRQ routing table for a | |
4119532c BM |
143 | * specific bus. The caller must first acquire a handle for the |
144 | * desired bus. The routine table is placed in the buffer pointed | |
1da177e4 LT |
145 | * to by the ret_buffer variable parameter. |
146 | * | |
147 | * If the function fails an appropriate status will be returned | |
148 | * and the value of ret_buffer is undefined. | |
149 | * | |
150 | * This function attempts to execute the _PRT method contained in | |
151 | * the object indicated by the passed device_handle. | |
152 | * | |
153 | ******************************************************************************/ | |
c51a4de8 | 154 | |
1da177e4 | 155 | acpi_status |
4be44fcd LB |
156 | acpi_get_irq_routing_table(acpi_handle device_handle, |
157 | struct acpi_buffer *ret_buffer) | |
1da177e4 | 158 | { |
4be44fcd | 159 | acpi_status status; |
4119532c | 160 | struct acpi_namespace_node *node; |
1da177e4 | 161 | |
b229cf92 | 162 | ACPI_FUNCTION_TRACE(acpi_get_irq_routing_table); |
1da177e4 | 163 | |
4119532c | 164 | /* Validate parameters then dispatch to internal routine */ |
1da177e4 | 165 | |
4119532c | 166 | status = acpi_rs_validate_parameters(device_handle, ret_buffer, &node); |
4be44fcd LB |
167 | if (ACPI_FAILURE(status)) { |
168 | return_ACPI_STATUS(status); | |
1da177e4 LT |
169 | } |
170 | ||
4119532c | 171 | status = acpi_rs_get_prt_method_data(node, ret_buffer); |
4be44fcd | 172 | return_ACPI_STATUS(status); |
1da177e4 LT |
173 | } |
174 | ||
8313524a BM |
175 | ACPI_EXPORT_SYMBOL(acpi_get_irq_routing_table) |
176 | ||
1da177e4 LT |
177 | /******************************************************************************* |
178 | * | |
179 | * FUNCTION: acpi_get_current_resources | |
180 | * | |
4119532c | 181 | * PARAMETERS: device_handle - Handle to the device object for the |
1da177e4 | 182 | * device we are querying |
4119532c | 183 | * ret_buffer - Pointer to a buffer to receive the |
1da177e4 LT |
184 | * current resources for the device |
185 | * | |
186 | * RETURN: Status | |
187 | * | |
188 | * DESCRIPTION: This function is called to get the current resources for a | |
4119532c BM |
189 | * specific device. The caller must first acquire a handle for |
190 | * the desired device. The resource data is placed in the buffer | |
1da177e4 LT |
191 | * pointed to by the ret_buffer variable parameter. |
192 | * | |
193 | * If the function fails an appropriate status will be returned | |
194 | * and the value of ret_buffer is undefined. | |
195 | * | |
196 | * This function attempts to execute the _CRS method contained in | |
197 | * the object indicated by the passed device_handle. | |
198 | * | |
199 | ******************************************************************************/ | |
1da177e4 | 200 | acpi_status |
4be44fcd LB |
201 | acpi_get_current_resources(acpi_handle device_handle, |
202 | struct acpi_buffer *ret_buffer) | |
1da177e4 | 203 | { |
4be44fcd | 204 | acpi_status status; |
4119532c | 205 | struct acpi_namespace_node *node; |
1da177e4 | 206 | |
b229cf92 | 207 | ACPI_FUNCTION_TRACE(acpi_get_current_resources); |
1da177e4 | 208 | |
4119532c | 209 | /* Validate parameters then dispatch to internal routine */ |
1da177e4 | 210 | |
4119532c | 211 | status = acpi_rs_validate_parameters(device_handle, ret_buffer, &node); |
4be44fcd LB |
212 | if (ACPI_FAILURE(status)) { |
213 | return_ACPI_STATUS(status); | |
1da177e4 LT |
214 | } |
215 | ||
4119532c | 216 | status = acpi_rs_get_crs_method_data(node, ret_buffer); |
4be44fcd | 217 | return_ACPI_STATUS(status); |
1da177e4 | 218 | } |
1da177e4 | 219 | |
8313524a | 220 | ACPI_EXPORT_SYMBOL(acpi_get_current_resources) |
8313524a | 221 | #ifdef ACPI_FUTURE_USAGE |
1da177e4 LT |
222 | /******************************************************************************* |
223 | * | |
224 | * FUNCTION: acpi_get_possible_resources | |
225 | * | |
4119532c | 226 | * PARAMETERS: device_handle - Handle to the device object for the |
1da177e4 | 227 | * device we are querying |
4119532c | 228 | * ret_buffer - Pointer to a buffer to receive the |
1da177e4 LT |
229 | * resources for the device |
230 | * | |
231 | * RETURN: Status | |
232 | * | |
233 | * DESCRIPTION: This function is called to get a list of the possible resources | |
4119532c BM |
234 | * for a specific device. The caller must first acquire a handle |
235 | * for the desired device. The resource data is placed in the | |
1da177e4 LT |
236 | * buffer pointed to by the ret_buffer variable. |
237 | * | |
238 | * If the function fails an appropriate status will be returned | |
239 | * and the value of ret_buffer is undefined. | |
240 | * | |
241 | ******************************************************************************/ | |
1da177e4 | 242 | acpi_status |
4be44fcd LB |
243 | acpi_get_possible_resources(acpi_handle device_handle, |
244 | struct acpi_buffer *ret_buffer) | |
1da177e4 | 245 | { |
4be44fcd | 246 | acpi_status status; |
4119532c | 247 | struct acpi_namespace_node *node; |
1da177e4 | 248 | |
b229cf92 | 249 | ACPI_FUNCTION_TRACE(acpi_get_possible_resources); |
1da177e4 | 250 | |
4119532c | 251 | /* Validate parameters then dispatch to internal routine */ |
1da177e4 | 252 | |
4119532c | 253 | status = acpi_rs_validate_parameters(device_handle, ret_buffer, &node); |
4be44fcd LB |
254 | if (ACPI_FAILURE(status)) { |
255 | return_ACPI_STATUS(status); | |
1da177e4 LT |
256 | } |
257 | ||
4119532c | 258 | status = acpi_rs_get_prs_method_data(node, ret_buffer); |
4be44fcd | 259 | return_ACPI_STATUS(status); |
1da177e4 | 260 | } |
1da177e4 | 261 | |
8313524a | 262 | ACPI_EXPORT_SYMBOL(acpi_get_possible_resources) |
4be44fcd | 263 | #endif /* ACPI_FUTURE_USAGE */ |
1da177e4 LT |
264 | /******************************************************************************* |
265 | * | |
266 | * FUNCTION: acpi_set_current_resources | |
267 | * | |
4119532c BM |
268 | * PARAMETERS: device_handle - Handle to the device object for the |
269 | * device we are setting resources | |
270 | * in_buffer - Pointer to a buffer containing the | |
1da177e4 LT |
271 | * resources to be set for the device |
272 | * | |
273 | * RETURN: Status | |
274 | * | |
275 | * DESCRIPTION: This function is called to set the current resources for a | |
4119532c BM |
276 | * specific device. The caller must first acquire a handle for |
277 | * the desired device. The resource data is passed to the routine | |
1da177e4 LT |
278 | * the buffer pointed to by the in_buffer variable. |
279 | * | |
280 | ******************************************************************************/ | |
1da177e4 | 281 | acpi_status |
4be44fcd LB |
282 | acpi_set_current_resources(acpi_handle device_handle, |
283 | struct acpi_buffer *in_buffer) | |
1da177e4 | 284 | { |
4be44fcd | 285 | acpi_status status; |
4119532c | 286 | struct acpi_namespace_node *node; |
1da177e4 | 287 | |
b229cf92 | 288 | ACPI_FUNCTION_TRACE(acpi_set_current_resources); |
1da177e4 | 289 | |
4119532c | 290 | /* Validate the buffer, don't allow zero length */ |
44f6c012 | 291 | |
4119532c | 292 | if ((!in_buffer) || (!in_buffer->pointer) || (!in_buffer->length)) { |
4be44fcd | 293 | return_ACPI_STATUS(AE_BAD_PARAMETER); |
1da177e4 LT |
294 | } |
295 | ||
4119532c BM |
296 | /* Validate parameters then dispatch to internal routine */ |
297 | ||
298 | status = acpi_rs_validate_parameters(device_handle, in_buffer, &node); | |
299 | if (ACPI_FAILURE(status)) { | |
300 | return_ACPI_STATUS(status); | |
301 | } | |
302 | ||
303 | status = acpi_rs_set_srs_method_data(node, in_buffer); | |
4be44fcd | 304 | return_ACPI_STATUS(status); |
1da177e4 | 305 | } |
1da177e4 | 306 | |
8313524a | 307 | ACPI_EXPORT_SYMBOL(acpi_set_current_resources) |
1da177e4 | 308 | |
1da177e4 LT |
309 | /****************************************************************************** |
310 | * | |
311 | * FUNCTION: acpi_resource_to_address64 | |
312 | * | |
4119532c BM |
313 | * PARAMETERS: Resource - Pointer to a resource |
314 | * Out - Pointer to the users's return buffer | |
315 | * (a struct acpi_resource_address64) | |
1da177e4 LT |
316 | * |
317 | * RETURN: Status | |
318 | * | |
319 | * DESCRIPTION: If the resource is an address16, address32, or address64, | |
4119532c | 320 | * copy it to the address64 return buffer. This saves the |
1da177e4 LT |
321 | * caller from having to duplicate code for different-sized |
322 | * addresses. | |
323 | * | |
324 | ******************************************************************************/ | |
1da177e4 | 325 | acpi_status |
4be44fcd LB |
326 | acpi_resource_to_address64(struct acpi_resource *resource, |
327 | struct acpi_resource_address64 *out) | |
1da177e4 | 328 | { |
4be44fcd LB |
329 | struct acpi_resource_address16 *address16; |
330 | struct acpi_resource_address32 *address32; | |
1da177e4 | 331 | |
c51a4de8 BM |
332 | if (!resource || !out) { |
333 | return (AE_BAD_PARAMETER); | |
334 | } | |
335 | ||
336 | /* Convert 16 or 32 address descriptor to 64 */ | |
337 | ||
bda663d3 | 338 | switch (resource->type) { |
50eca3eb | 339 | case ACPI_RESOURCE_TYPE_ADDRESS16: |
1da177e4 | 340 | |
ba9c3f55 BM |
341 | address16 = |
342 | ACPI_CAST_PTR(struct acpi_resource_address16, | |
343 | &resource->data); | |
4be44fcd | 344 | ACPI_COPY_ADDRESS(out, address16); |
1da177e4 LT |
345 | break; |
346 | ||
50eca3eb | 347 | case ACPI_RESOURCE_TYPE_ADDRESS32: |
1da177e4 | 348 | |
ba9c3f55 BM |
349 | address32 = |
350 | ACPI_CAST_PTR(struct acpi_resource_address32, | |
351 | &resource->data); | |
4be44fcd | 352 | ACPI_COPY_ADDRESS(out, address32); |
1da177e4 LT |
353 | break; |
354 | ||
50eca3eb | 355 | case ACPI_RESOURCE_TYPE_ADDRESS64: |
1da177e4 LT |
356 | |
357 | /* Simple copy for 64 bit source */ | |
358 | ||
4be44fcd LB |
359 | ACPI_MEMCPY(out, &resource->data, |
360 | sizeof(struct acpi_resource_address64)); | |
1da177e4 LT |
361 | break; |
362 | ||
1da177e4 LT |
363 | default: |
364 | return (AE_BAD_PARAMETER); | |
365 | } | |
366 | ||
367 | return (AE_OK); | |
368 | } | |
4be44fcd | 369 | |
8313524a | 370 | ACPI_EXPORT_SYMBOL(acpi_resource_to_address64) |
c51a4de8 BM |
371 | |
372 | /******************************************************************************* | |
373 | * | |
374 | * FUNCTION: acpi_get_vendor_resource | |
375 | * | |
4119532c BM |
376 | * PARAMETERS: device_handle - Handle for the parent device object |
377 | * Name - Method name for the parent resource | |
378 | * (METHOD_NAME__CRS or METHOD_NAME__PRS) | |
379 | * Uuid - Pointer to the UUID to be matched. | |
380 | * includes both subtype and 16-byte UUID | |
381 | * ret_buffer - Where the vendor resource is returned | |
c51a4de8 BM |
382 | * |
383 | * RETURN: Status | |
384 | * | |
385 | * DESCRIPTION: Walk a resource template for the specified evice to find a | |
386 | * vendor-defined resource that matches the supplied UUID and | |
387 | * UUID subtype. Returns a struct acpi_resource of type Vendor. | |
388 | * | |
389 | ******************************************************************************/ | |
c51a4de8 BM |
390 | acpi_status |
391 | acpi_get_vendor_resource(acpi_handle device_handle, | |
392 | char *name, | |
393 | struct acpi_vendor_uuid * uuid, | |
394 | struct acpi_buffer * ret_buffer) | |
395 | { | |
396 | struct acpi_vendor_walk_info info; | |
397 | acpi_status status; | |
398 | ||
399 | /* Other parameters are validated by acpi_walk_resources */ | |
400 | ||
401 | if (!uuid || !ret_buffer) { | |
402 | return (AE_BAD_PARAMETER); | |
403 | } | |
404 | ||
405 | info.uuid = uuid; | |
406 | info.buffer = ret_buffer; | |
407 | info.status = AE_NOT_EXIST; | |
408 | ||
409 | /* Walk the _CRS or _PRS resource list for this device */ | |
410 | ||
411 | status = | |
412 | acpi_walk_resources(device_handle, name, | |
413 | acpi_rs_match_vendor_resource, &info); | |
414 | if (ACPI_FAILURE(status)) { | |
415 | return (status); | |
416 | } | |
417 | ||
418 | return (info.status); | |
419 | } | |
420 | ||
8313524a BM |
421 | ACPI_EXPORT_SYMBOL(acpi_get_vendor_resource) |
422 | ||
c51a4de8 BM |
423 | /******************************************************************************* |
424 | * | |
425 | * FUNCTION: acpi_rs_match_vendor_resource | |
426 | * | |
61686124 | 427 | * PARAMETERS: acpi_walk_resource_callback |
c51a4de8 BM |
428 | * |
429 | * RETURN: Status | |
430 | * | |
431 | * DESCRIPTION: Match a vendor resource via the ACPI 3.0 UUID | |
432 | * | |
433 | ******************************************************************************/ | |
c51a4de8 BM |
434 | static acpi_status |
435 | acpi_rs_match_vendor_resource(struct acpi_resource *resource, void *context) | |
436 | { | |
437 | struct acpi_vendor_walk_info *info = context; | |
438 | struct acpi_resource_vendor_typed *vendor; | |
439 | struct acpi_buffer *buffer; | |
440 | acpi_status status; | |
441 | ||
442 | /* Ignore all descriptors except Vendor */ | |
443 | ||
444 | if (resource->type != ACPI_RESOURCE_TYPE_VENDOR) { | |
445 | return (AE_OK); | |
446 | } | |
447 | ||
448 | vendor = &resource->data.vendor_typed; | |
449 | ||
450 | /* | |
451 | * For a valid match, these conditions must hold: | |
452 | * | |
453 | * 1) Length of descriptor data must be at least as long as a UUID struct | |
454 | * 2) The UUID subtypes must match | |
455 | * 3) The UUID data must match | |
456 | */ | |
457 | if ((vendor->byte_length < (ACPI_UUID_LENGTH + 1)) || | |
458 | (vendor->uuid_subtype != info->uuid->subtype) || | |
459 | (ACPI_MEMCMP(vendor->uuid, info->uuid->data, ACPI_UUID_LENGTH))) { | |
460 | return (AE_OK); | |
461 | } | |
462 | ||
463 | /* Validate/Allocate/Clear caller buffer */ | |
464 | ||
465 | buffer = info->buffer; | |
466 | status = acpi_ut_initialize_buffer(buffer, resource->length); | |
467 | if (ACPI_FAILURE(status)) { | |
468 | return (status); | |
469 | } | |
470 | ||
471 | /* Found the correct resource, copy and return it */ | |
472 | ||
473 | ACPI_MEMCPY(buffer->pointer, resource, resource->length); | |
474 | buffer->length = resource->length; | |
475 | ||
476 | /* Found the desired descriptor, terminate resource walk */ | |
477 | ||
478 | info->status = AE_OK; | |
479 | return (AE_CTRL_TERMINATE); | |
480 | } | |
8313524a | 481 | |
4119532c BM |
482 | /******************************************************************************* |
483 | * | |
484 | * FUNCTION: acpi_walk_resources | |
485 | * | |
486 | * PARAMETERS: device_handle - Handle to the device object for the | |
487 | * device we are querying | |
488 | * Name - Method name of the resources we want | |
489 | * (METHOD_NAME__CRS or METHOD_NAME__PRS) | |
490 | * user_function - Called for each resource | |
491 | * Context - Passed to user_function | |
492 | * | |
493 | * RETURN: Status | |
494 | * | |
495 | * DESCRIPTION: Retrieves the current or possible resource list for the | |
496 | * specified device. The user_function is called once for | |
497 | * each resource in the list. | |
498 | * | |
499 | ******************************************************************************/ | |
4119532c BM |
500 | acpi_status |
501 | acpi_walk_resources(acpi_handle device_handle, | |
502 | char *name, | |
503 | acpi_walk_resource_callback user_function, void *context) | |
504 | { | |
505 | acpi_status status; | |
506 | struct acpi_buffer buffer; | |
507 | struct acpi_resource *resource; | |
508 | struct acpi_resource *resource_end; | |
509 | ||
510 | ACPI_FUNCTION_TRACE(acpi_walk_resources); | |
511 | ||
512 | /* Parameter validation */ | |
513 | ||
514 | if (!device_handle || !user_function || !name || | |
515 | (!ACPI_COMPARE_NAME(name, METHOD_NAME__CRS) && | |
516 | !ACPI_COMPARE_NAME(name, METHOD_NAME__PRS))) { | |
517 | return_ACPI_STATUS(AE_BAD_PARAMETER); | |
518 | } | |
519 | ||
520 | /* Get the _CRS or _PRS resource list */ | |
521 | ||
522 | buffer.length = ACPI_ALLOCATE_LOCAL_BUFFER; | |
523 | status = acpi_rs_get_method_data(device_handle, name, &buffer); | |
524 | if (ACPI_FAILURE(status)) { | |
525 | return_ACPI_STATUS(status); | |
526 | } | |
527 | ||
528 | /* Buffer now contains the resource list */ | |
529 | ||
530 | resource = ACPI_CAST_PTR(struct acpi_resource, buffer.pointer); | |
531 | resource_end = | |
532 | ACPI_ADD_PTR(struct acpi_resource, buffer.pointer, buffer.length); | |
533 | ||
534 | /* Walk the resource list until the end_tag is found (or buffer end) */ | |
535 | ||
536 | while (resource < resource_end) { | |
537 | ||
538 | /* Sanity check the resource */ | |
539 | ||
540 | if (resource->type > ACPI_RESOURCE_TYPE_MAX) { | |
541 | status = AE_AML_INVALID_RESOURCE_TYPE; | |
542 | break; | |
543 | } | |
544 | ||
545 | /* Invoke the user function, abort on any error returned */ | |
546 | ||
547 | status = user_function(resource, context); | |
548 | if (ACPI_FAILURE(status)) { | |
549 | if (status == AE_CTRL_TERMINATE) { | |
550 | ||
551 | /* This is an OK termination by the user function */ | |
552 | ||
553 | status = AE_OK; | |
554 | } | |
555 | break; | |
556 | } | |
557 | ||
558 | /* end_tag indicates end-of-list */ | |
559 | ||
560 | if (resource->type == ACPI_RESOURCE_TYPE_END_TAG) { | |
561 | break; | |
562 | } | |
563 | ||
564 | /* Get the next resource descriptor */ | |
565 | ||
566 | resource = | |
567 | ACPI_ADD_PTR(struct acpi_resource, resource, | |
568 | resource->length); | |
569 | } | |
570 | ||
571 | ACPI_FREE(buffer.pointer); | |
572 | return_ACPI_STATUS(status); | |
573 | } | |
574 | ||
575 | ACPI_EXPORT_SYMBOL(acpi_walk_resources) |