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c942fddf | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 LT |
2 | /* |
3 | * acpi_utils.c - ACPI Utility Functions ($Revision: 10 $) | |
4 | * | |
5 | * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com> | |
6 | * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com> | |
1da177e4 LT |
7 | */ |
8 | ||
fba2ae30 RW |
9 | #define pr_fmt(fmt) "ACPI: utils: " fmt |
10 | ||
1da177e4 LT |
11 | #include <linux/kernel.h> |
12 | #include <linux/module.h> | |
5a0e3ad6 | 13 | #include <linux/slab.h> |
1da177e4 LT |
14 | #include <linux/init.h> |
15 | #include <linux/types.h> | |
fbfddae6 TK |
16 | #include <linux/hardirq.h> |
17 | #include <linux/acpi.h> | |
45fef5b8 | 18 | #include <linux/dynamic_debug.h> |
1da177e4 | 19 | |
a192a958 | 20 | #include "internal.h" |
2d12b6b3 | 21 | #include "sleep.h" |
a192a958 | 22 | |
1da177e4 LT |
23 | /* -------------------------------------------------------------------------- |
24 | Object Evaluation Helpers | |
25 | -------------------------------------------------------------------------- */ | |
fba2ae30 | 26 | static void acpi_util_eval_error(acpi_handle h, acpi_string p, acpi_status s) |
4fd7f518 | 27 | { |
fba2ae30 | 28 | acpi_handle_debug(h, "Evaluate [%s]: %s\n", p, acpi_format_exception(s)); |
4fd7f518 HH |
29 | } |
30 | ||
1da177e4 | 31 | acpi_status |
4be44fcd LB |
32 | acpi_extract_package(union acpi_object *package, |
33 | struct acpi_buffer *format, struct acpi_buffer *buffer) | |
1da177e4 | 34 | { |
4be44fcd LB |
35 | u32 size_required = 0; |
36 | u32 tail_offset = 0; | |
37 | char *format_string = NULL; | |
38 | u32 format_count = 0; | |
39 | u32 i = 0; | |
40 | u8 *head = NULL; | |
41 | u8 *tail = NULL; | |
1da177e4 | 42 | |
1da177e4 | 43 | |
4be44fcd LB |
44 | if (!package || (package->type != ACPI_TYPE_PACKAGE) |
45 | || (package->package.count < 1)) { | |
fba2ae30 | 46 | pr_debug("Invalid package argument\n"); |
d550d98d | 47 | return AE_BAD_PARAMETER; |
1da177e4 LT |
48 | } |
49 | ||
50 | if (!format || !format->pointer || (format->length < 1)) { | |
fba2ae30 | 51 | pr_debug("Invalid format argument\n"); |
d550d98d | 52 | return AE_BAD_PARAMETER; |
1da177e4 LT |
53 | } |
54 | ||
55 | if (!buffer) { | |
fba2ae30 | 56 | pr_debug("Invalid buffer argument\n"); |
d550d98d | 57 | return AE_BAD_PARAMETER; |
1da177e4 LT |
58 | } |
59 | ||
4be44fcd | 60 | format_count = (format->length / sizeof(char)) - 1; |
1da177e4 | 61 | if (format_count > package->package.count) { |
fba2ae30 RW |
62 | pr_debug("Format specifies more objects [%d] than present [%d]\n", |
63 | format_count, package->package.count); | |
d550d98d | 64 | return AE_BAD_DATA; |
1da177e4 LT |
65 | } |
66 | ||
50dd0969 | 67 | format_string = format->pointer; |
1da177e4 LT |
68 | |
69 | /* | |
70 | * Calculate size_required. | |
71 | */ | |
4be44fcd | 72 | for (i = 0; i < format_count; i++) { |
1da177e4 LT |
73 | |
74 | union acpi_object *element = &(package->package.elements[i]); | |
75 | ||
1da177e4 LT |
76 | switch (element->type) { |
77 | ||
78 | case ACPI_TYPE_INTEGER: | |
79 | switch (format_string[i]) { | |
80 | case 'N': | |
439913ff LM |
81 | size_required += sizeof(u64); |
82 | tail_offset += sizeof(u64); | |
1da177e4 LT |
83 | break; |
84 | case 'S': | |
4be44fcd | 85 | size_required += |
439913ff | 86 | sizeof(char *) + sizeof(u64) + |
4be44fcd LB |
87 | sizeof(char); |
88 | tail_offset += sizeof(char *); | |
1da177e4 LT |
89 | break; |
90 | default: | |
fba2ae30 RW |
91 | pr_debug("Invalid package element [%d]: got number, expected [%c]\n", |
92 | i, format_string[i]); | |
d550d98d | 93 | return AE_BAD_DATA; |
1da177e4 LT |
94 | } |
95 | break; | |
96 | ||
97 | case ACPI_TYPE_STRING: | |
98 | case ACPI_TYPE_BUFFER: | |
99 | switch (format_string[i]) { | |
100 | case 'S': | |
4be44fcd LB |
101 | size_required += |
102 | sizeof(char *) + | |
103 | (element->string.length * sizeof(char)) + | |
104 | sizeof(char); | |
105 | tail_offset += sizeof(char *); | |
1da177e4 LT |
106 | break; |
107 | case 'B': | |
4be44fcd | 108 | size_required += |
d93de345 | 109 | sizeof(u8 *) + element->buffer.length; |
4be44fcd | 110 | tail_offset += sizeof(u8 *); |
1da177e4 LT |
111 | break; |
112 | default: | |
fba2ae30 RW |
113 | pr_debug("Invalid package element [%d] got string/buffer, expected [%c]\n", |
114 | i, format_string[i]); | |
d550d98d | 115 | return AE_BAD_DATA; |
1da177e4 LT |
116 | } |
117 | break; | |
e3ec483a ZR |
118 | case ACPI_TYPE_LOCAL_REFERENCE: |
119 | switch (format_string[i]) { | |
120 | case 'R': | |
121 | size_required += sizeof(void *); | |
122 | tail_offset += sizeof(void *); | |
123 | break; | |
124 | default: | |
fba2ae30 RW |
125 | pr_debug("Invalid package element [%d] got reference, expected [%c]\n", |
126 | i, format_string[i]); | |
e3ec483a | 127 | return AE_BAD_DATA; |
e3ec483a ZR |
128 | } |
129 | break; | |
1da177e4 LT |
130 | |
131 | case ACPI_TYPE_PACKAGE: | |
132 | default: | |
fba2ae30 | 133 | pr_debug("Unsupported element at index=%d\n", i); |
1da177e4 | 134 | /* TBD: handle nested packages... */ |
d550d98d | 135 | return AE_SUPPORT; |
1da177e4 LT |
136 | } |
137 | } | |
138 | ||
139 | /* | |
140 | * Validate output buffer. | |
141 | */ | |
e83dda06 | 142 | if (buffer->length == ACPI_ALLOCATE_BUFFER) { |
2d0acb4a | 143 | buffer->pointer = ACPI_ALLOCATE_ZEROED(size_required); |
e83dda06 AS |
144 | if (!buffer->pointer) |
145 | return AE_NO_MEMORY; | |
1da177e4 | 146 | buffer->length = size_required; |
e83dda06 AS |
147 | } else { |
148 | if (buffer->length < size_required) { | |
149 | buffer->length = size_required; | |
150 | return AE_BUFFER_OVERFLOW; | |
151 | } else if (buffer->length != size_required || | |
152 | !buffer->pointer) { | |
153 | return AE_BAD_PARAMETER; | |
154 | } | |
1da177e4 LT |
155 | } |
156 | ||
157 | head = buffer->pointer; | |
158 | tail = buffer->pointer + tail_offset; | |
159 | ||
160 | /* | |
161 | * Extract package data. | |
162 | */ | |
4be44fcd | 163 | for (i = 0; i < format_count; i++) { |
1da177e4 LT |
164 | |
165 | u8 **pointer = NULL; | |
166 | union acpi_object *element = &(package->package.elements[i]); | |
167 | ||
1da177e4 LT |
168 | switch (element->type) { |
169 | ||
170 | case ACPI_TYPE_INTEGER: | |
171 | switch (format_string[i]) { | |
172 | case 'N': | |
439913ff | 173 | *((u64 *) head) = |
4be44fcd | 174 | element->integer.value; |
439913ff | 175 | head += sizeof(u64); |
1da177e4 LT |
176 | break; |
177 | case 'S': | |
4be44fcd | 178 | pointer = (u8 **) head; |
1da177e4 | 179 | *pointer = tail; |
439913ff | 180 | *((u64 *) tail) = |
4be44fcd | 181 | element->integer.value; |
439913ff LM |
182 | head += sizeof(u64 *); |
183 | tail += sizeof(u64); | |
1da177e4 LT |
184 | /* NULL terminate string */ |
185 | *tail = (char)0; | |
186 | tail += sizeof(char); | |
187 | break; | |
188 | default: | |
189 | /* Should never get here */ | |
190 | break; | |
191 | } | |
192 | break; | |
193 | ||
194 | case ACPI_TYPE_STRING: | |
195 | case ACPI_TYPE_BUFFER: | |
196 | switch (format_string[i]) { | |
197 | case 'S': | |
4be44fcd | 198 | pointer = (u8 **) head; |
1da177e4 | 199 | *pointer = tail; |
4be44fcd LB |
200 | memcpy(tail, element->string.pointer, |
201 | element->string.length); | |
202 | head += sizeof(char *); | |
1da177e4 LT |
203 | tail += element->string.length * sizeof(char); |
204 | /* NULL terminate string */ | |
205 | *tail = (char)0; | |
206 | tail += sizeof(char); | |
207 | break; | |
208 | case 'B': | |
4be44fcd | 209 | pointer = (u8 **) head; |
1da177e4 | 210 | *pointer = tail; |
4be44fcd LB |
211 | memcpy(tail, element->buffer.pointer, |
212 | element->buffer.length); | |
213 | head += sizeof(u8 *); | |
d93de345 | 214 | tail += element->buffer.length; |
1da177e4 LT |
215 | break; |
216 | default: | |
217 | /* Should never get here */ | |
218 | break; | |
219 | } | |
220 | break; | |
e3ec483a ZR |
221 | case ACPI_TYPE_LOCAL_REFERENCE: |
222 | switch (format_string[i]) { | |
223 | case 'R': | |
224 | *(void **)head = | |
225 | (void *)element->reference.handle; | |
226 | head += sizeof(void *); | |
227 | break; | |
228 | default: | |
229 | /* Should never get here */ | |
230 | break; | |
231 | } | |
232 | break; | |
1da177e4 LT |
233 | case ACPI_TYPE_PACKAGE: |
234 | /* TBD: handle nested packages... */ | |
235 | default: | |
236 | /* Should never get here */ | |
237 | break; | |
238 | } | |
239 | } | |
240 | ||
d550d98d | 241 | return AE_OK; |
1da177e4 | 242 | } |
1da177e4 | 243 | |
4be44fcd | 244 | EXPORT_SYMBOL(acpi_extract_package); |
1da177e4 LT |
245 | |
246 | acpi_status | |
4be44fcd LB |
247 | acpi_evaluate_integer(acpi_handle handle, |
248 | acpi_string pathname, | |
27663c58 | 249 | struct acpi_object_list *arguments, unsigned long long *data) |
1da177e4 | 250 | { |
4be44fcd | 251 | acpi_status status = AE_OK; |
40599072 | 252 | union acpi_object element; |
4be44fcd | 253 | struct acpi_buffer buffer = { 0, NULL }; |
1da177e4 | 254 | |
1da177e4 | 255 | if (!data) |
d550d98d | 256 | return AE_BAD_PARAMETER; |
1da177e4 | 257 | |
1da177e4 | 258 | buffer.length = sizeof(union acpi_object); |
40599072 | 259 | buffer.pointer = &element; |
1da177e4 LT |
260 | status = acpi_evaluate_object(handle, pathname, arguments, &buffer); |
261 | if (ACPI_FAILURE(status)) { | |
262 | acpi_util_eval_error(handle, pathname, status); | |
d550d98d | 263 | return status; |
1da177e4 LT |
264 | } |
265 | ||
40599072 | 266 | if (element.type != ACPI_TYPE_INTEGER) { |
1da177e4 | 267 | acpi_util_eval_error(handle, pathname, AE_BAD_DATA); |
d550d98d | 268 | return AE_BAD_DATA; |
1da177e4 LT |
269 | } |
270 | ||
40599072 | 271 | *data = element.integer.value; |
1da177e4 | 272 | |
fba2ae30 | 273 | acpi_handle_debug(handle, "Return value [%llu]\n", *data); |
1da177e4 | 274 | |
d550d98d | 275 | return AE_OK; |
1da177e4 | 276 | } |
1da177e4 | 277 | |
4be44fcd | 278 | EXPORT_SYMBOL(acpi_evaluate_integer); |
1da177e4 | 279 | |
7ec16433 CJ |
280 | int acpi_get_local_address(acpi_handle handle, u32 *addr) |
281 | { | |
282 | unsigned long long adr; | |
283 | acpi_status status; | |
284 | ||
285 | status = acpi_evaluate_integer(handle, METHOD_NAME__ADR, NULL, &adr); | |
286 | if (ACPI_FAILURE(status)) | |
287 | return -ENODATA; | |
288 | ||
289 | *addr = (u32)adr; | |
290 | return 0; | |
291 | } | |
292 | EXPORT_SYMBOL(acpi_get_local_address); | |
293 | ||
93064e15 SB |
294 | #define ACPI_MAX_SUB_BUF_SIZE 9 |
295 | ||
296 | const char *acpi_get_subsystem_id(acpi_handle handle) | |
297 | { | |
298 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
299 | union acpi_object *obj; | |
300 | acpi_status status; | |
301 | const char *sub; | |
302 | size_t len; | |
303 | ||
304 | status = acpi_evaluate_object(handle, METHOD_NAME__SUB, NULL, &buffer); | |
305 | if (ACPI_FAILURE(status)) { | |
306 | acpi_handle_debug(handle, "Reading ACPI _SUB failed: %#x\n", status); | |
307 | return ERR_PTR(-ENODATA); | |
308 | } | |
309 | ||
310 | obj = buffer.pointer; | |
311 | if (obj->type == ACPI_TYPE_STRING) { | |
312 | len = strlen(obj->string.pointer); | |
313 | if (len < ACPI_MAX_SUB_BUF_SIZE && len > 0) { | |
314 | sub = kstrdup(obj->string.pointer, GFP_KERNEL); | |
315 | if (!sub) | |
316 | sub = ERR_PTR(-ENOMEM); | |
317 | } else { | |
318 | acpi_handle_err(handle, "ACPI _SUB Length %zu is Invalid\n", len); | |
319 | sub = ERR_PTR(-ENODATA); | |
320 | } | |
321 | } else { | |
322 | acpi_handle_warn(handle, "Warning ACPI _SUB did not return a string\n"); | |
323 | sub = ERR_PTR(-ENODATA); | |
324 | } | |
325 | ||
326 | acpi_os_free(buffer.pointer); | |
327 | ||
328 | return sub; | |
329 | } | |
330 | EXPORT_SYMBOL_GPL(acpi_get_subsystem_id); | |
331 | ||
1da177e4 | 332 | acpi_status |
4be44fcd LB |
333 | acpi_evaluate_reference(acpi_handle handle, |
334 | acpi_string pathname, | |
335 | struct acpi_object_list *arguments, | |
336 | struct acpi_handle_list *list) | |
1da177e4 | 337 | { |
4be44fcd LB |
338 | acpi_status status = AE_OK; |
339 | union acpi_object *package = NULL; | |
340 | union acpi_object *element = NULL; | |
341 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
342 | u32 i = 0; | |
1da177e4 | 343 | |
1da177e4 | 344 | |
6b54bdd1 | 345 | if (!list) |
d550d98d | 346 | return AE_BAD_PARAMETER; |
1da177e4 LT |
347 | |
348 | /* Evaluate object. */ | |
349 | ||
350 | status = acpi_evaluate_object(handle, pathname, arguments, &buffer); | |
351 | if (ACPI_FAILURE(status)) | |
352 | goto end; | |
353 | ||
50dd0969 | 354 | package = buffer.pointer; |
1da177e4 LT |
355 | |
356 | if ((buffer.length == 0) || !package) { | |
1da177e4 LT |
357 | status = AE_BAD_DATA; |
358 | acpi_util_eval_error(handle, pathname, status); | |
359 | goto end; | |
360 | } | |
361 | if (package->type != ACPI_TYPE_PACKAGE) { | |
1da177e4 LT |
362 | status = AE_BAD_DATA; |
363 | acpi_util_eval_error(handle, pathname, status); | |
364 | goto end; | |
365 | } | |
366 | if (!package->package.count) { | |
1da177e4 LT |
367 | status = AE_BAD_DATA; |
368 | acpi_util_eval_error(handle, pathname, status); | |
369 | goto end; | |
370 | } | |
371 | ||
2e57d10a RW |
372 | list->handles = kcalloc(package->package.count, sizeof(*list->handles), GFP_KERNEL); |
373 | if (!list->handles) { | |
09e15086 | 374 | kfree(package); |
d550d98d | 375 | return AE_NO_MEMORY; |
1da177e4 LT |
376 | } |
377 | list->count = package->package.count; | |
378 | ||
379 | /* Extract package data. */ | |
380 | ||
381 | for (i = 0; i < list->count; i++) { | |
382 | ||
383 | element = &(package->package.elements[i]); | |
384 | ||
cd0b2248 | 385 | if (element->type != ACPI_TYPE_LOCAL_REFERENCE) { |
1da177e4 | 386 | status = AE_BAD_DATA; |
1da177e4 LT |
387 | acpi_util_eval_error(handle, pathname, status); |
388 | break; | |
389 | } | |
390 | ||
b6a16387 | 391 | if (!element->reference.handle) { |
b6a16387 | 392 | status = AE_NULL_ENTRY; |
c48cf1b9 | 393 | acpi_util_eval_error(handle, pathname, status); |
b6a16387 TR |
394 | break; |
395 | } | |
1da177e4 LT |
396 | /* Get the acpi_handle. */ |
397 | ||
398 | list->handles[i] = element->reference.handle; | |
fba2ae30 | 399 | acpi_handle_debug(list->handles[i], "Found in reference list\n"); |
1da177e4 LT |
400 | } |
401 | ||
1da177e4 LT |
402 | if (ACPI_FAILURE(status)) { |
403 | list->count = 0; | |
2e57d10a RW |
404 | kfree(list->handles); |
405 | list->handles = NULL; | |
1da177e4 LT |
406 | } |
407 | ||
8f0b960a | 408 | end: |
02438d87 | 409 | kfree(buffer.pointer); |
1da177e4 | 410 | |
d550d98d | 411 | return status; |
1da177e4 | 412 | } |
1da177e4 | 413 | |
4be44fcd | 414 | EXPORT_SYMBOL(acpi_evaluate_reference); |
38ac0f1b | 415 | |
2e57d10a RW |
416 | /** |
417 | * acpi_handle_list_equal - Check if two ACPI handle lists are the same | |
418 | * @list1: First list to compare. | |
419 | * @list2: Second list to compare. | |
420 | * | |
421 | * Return true if the given ACPI handle lists are of the same size and | |
422 | * contain the same ACPI handles in the same order. Otherwise, return false. | |
423 | */ | |
424 | bool acpi_handle_list_equal(struct acpi_handle_list *list1, | |
425 | struct acpi_handle_list *list2) | |
426 | { | |
427 | return list1->count == list2->count && | |
428 | !memcmp(list1->handles, list2->handles, | |
429 | list1->count * sizeof(acpi_handle)); | |
430 | } | |
431 | EXPORT_SYMBOL_GPL(acpi_handle_list_equal); | |
432 | ||
433 | /** | |
434 | * acpi_handle_list_replace - Replace one ACPI handle list with another | |
435 | * @dst: ACPI handle list to replace. | |
436 | * @src: Source ACPI handle list. | |
437 | * | |
438 | * Free the handles table in @dst, move the handles table from @src to @dst, | |
439 | * copy count from @src to @dst and clear @src. | |
440 | */ | |
441 | void acpi_handle_list_replace(struct acpi_handle_list *dst, | |
442 | struct acpi_handle_list *src) | |
443 | { | |
444 | if (dst->count) | |
445 | kfree(dst->handles); | |
446 | ||
447 | dst->count = src->count; | |
448 | dst->handles = src->handles; | |
449 | ||
450 | src->handles = NULL; | |
451 | src->count = 0; | |
452 | } | |
453 | EXPORT_SYMBOL_GPL(acpi_handle_list_replace); | |
454 | ||
455 | /** | |
456 | * acpi_handle_list_free - Free the handles table in an ACPI handle list | |
457 | * @list: ACPI handle list to free. | |
458 | * | |
459 | * Free the handles table in @list and clear its count field. | |
460 | */ | |
461 | void acpi_handle_list_free(struct acpi_handle_list *list) | |
462 | { | |
463 | if (!list->count) | |
464 | return; | |
465 | ||
466 | kfree(list->handles); | |
467 | list->count = 0; | |
468 | } | |
469 | EXPORT_SYMBOL_GPL(acpi_handle_list_free); | |
470 | ||
38ac0f1b | 471 | acpi_status |
8ede06ab | 472 | acpi_get_physical_device_location(acpi_handle handle, struct acpi_pld_info **pld) |
38ac0f1b MG |
473 | { |
474 | acpi_status status; | |
475 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
476 | union acpi_object *output; | |
477 | ||
478 | status = acpi_evaluate_object(handle, "_PLD", NULL, &buffer); | |
479 | ||
480 | if (ACPI_FAILURE(status)) | |
481 | return status; | |
482 | ||
483 | output = buffer.pointer; | |
484 | ||
485 | if (!output || output->type != ACPI_TYPE_PACKAGE | |
486 | || !output->package.count | |
487 | || output->package.elements[0].type != ACPI_TYPE_BUFFER | |
8ede06ab | 488 | || output->package.elements[0].buffer.length < ACPI_PLD_REV1_BUFFER_SIZE) { |
38ac0f1b MG |
489 | status = AE_TYPE; |
490 | goto out; | |
491 | } | |
492 | ||
8ede06ab FT |
493 | status = acpi_decode_pld_buffer( |
494 | output->package.elements[0].buffer.pointer, | |
495 | output->package.elements[0].buffer.length, | |
496 | pld); | |
497 | ||
38ac0f1b MG |
498 | out: |
499 | kfree(buffer.pointer); | |
500 | return status; | |
501 | } | |
502 | EXPORT_SYMBOL(acpi_get_physical_device_location); | |
275c58d7 TK |
503 | |
504 | /** | |
700b8422 | 505 | * acpi_evaluate_ost: Evaluate _OST for hotplug operations |
275c58d7 TK |
506 | * @handle: ACPI device handle |
507 | * @source_event: source event code | |
508 | * @status_code: status code | |
509 | * @status_buf: optional detailed information (NULL if none) | |
510 | * | |
511 | * Evaluate _OST for hotplug operations. All ACPI hotplug handlers | |
512 | * must call this function when evaluating _OST for hotplug operations. | |
513 | * When the platform does not support _OST, this function has no effect. | |
514 | */ | |
515 | acpi_status | |
05730c19 JL |
516 | acpi_evaluate_ost(acpi_handle handle, u32 source_event, u32 status_code, |
517 | struct acpi_buffer *status_buf) | |
275c58d7 | 518 | { |
275c58d7 TK |
519 | union acpi_object params[3] = { |
520 | {.type = ACPI_TYPE_INTEGER,}, | |
521 | {.type = ACPI_TYPE_INTEGER,}, | |
522 | {.type = ACPI_TYPE_BUFFER,} | |
523 | }; | |
524 | struct acpi_object_list arg_list = {3, params}; | |
275c58d7 TK |
525 | |
526 | params[0].integer.value = source_event; | |
527 | params[1].integer.value = status_code; | |
528 | if (status_buf != NULL) { | |
529 | params[2].buffer.pointer = status_buf->pointer; | |
530 | params[2].buffer.length = status_buf->length; | |
531 | } else { | |
532 | params[2].buffer.pointer = NULL; | |
533 | params[2].buffer.length = 0; | |
534 | } | |
535 | ||
05730c19 | 536 | return acpi_evaluate_object(handle, "_OST", &arg_list, NULL); |
275c58d7 | 537 | } |
05730c19 | 538 | EXPORT_SYMBOL(acpi_evaluate_ost); |
fbfddae6 | 539 | |
45fef5b8 BM |
540 | /** |
541 | * acpi_handle_path: Return the object path of handle | |
8373f8c6 | 542 | * @handle: ACPI device handle |
45fef5b8 BM |
543 | * |
544 | * Caller must free the returned buffer | |
545 | */ | |
546 | static char *acpi_handle_path(acpi_handle handle) | |
547 | { | |
548 | struct acpi_buffer buffer = { | |
549 | .length = ACPI_ALLOCATE_BUFFER, | |
550 | .pointer = NULL | |
551 | }; | |
552 | ||
553 | if (in_interrupt() || | |
554 | acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer) != AE_OK) | |
555 | return NULL; | |
556 | return buffer.pointer; | |
557 | } | |
558 | ||
fbfddae6 TK |
559 | /** |
560 | * acpi_handle_printk: Print message with ACPI prefix and object path | |
8373f8c6 AS |
561 | * @level: log level |
562 | * @handle: ACPI device handle | |
563 | * @fmt: format string | |
fbfddae6 TK |
564 | * |
565 | * This function is called through acpi_handle_<level> macros and prints | |
566 | * a message with ACPI prefix and object path. This function acquires | |
567 | * the global namespace mutex to obtain an object path. In interrupt | |
568 | * context, it shows the object path as <n/a>. | |
569 | */ | |
570 | void | |
571 | acpi_handle_printk(const char *level, acpi_handle handle, const char *fmt, ...) | |
572 | { | |
573 | struct va_format vaf; | |
574 | va_list args; | |
fbfddae6 TK |
575 | const char *path; |
576 | ||
577 | va_start(args, fmt); | |
578 | vaf.fmt = fmt; | |
579 | vaf.va = &args; | |
580 | ||
45fef5b8 | 581 | path = acpi_handle_path(handle); |
6c766f7a | 582 | printk("%sACPI: %s: %pV", level, path ? path : "<n/a>", &vaf); |
fbfddae6 TK |
583 | |
584 | va_end(args); | |
45fef5b8 | 585 | kfree(path); |
fbfddae6 TK |
586 | } |
587 | EXPORT_SYMBOL(acpi_handle_printk); | |
952c63e9 | 588 | |
45fef5b8 BM |
589 | #if defined(CONFIG_DYNAMIC_DEBUG) |
590 | /** | |
591 | * __acpi_handle_debug: pr_debug with ACPI prefix and object path | |
8373f8c6 AS |
592 | * @descriptor: Dynamic Debug descriptor |
593 | * @handle: ACPI device handle | |
594 | * @fmt: format string | |
45fef5b8 BM |
595 | * |
596 | * This function is called through acpi_handle_debug macro and debug | |
597 | * prints a message with ACPI prefix and object path. This function | |
598 | * acquires the global namespace mutex to obtain an object path. In | |
599 | * interrupt context, it shows the object path as <n/a>. | |
600 | */ | |
601 | void | |
602 | __acpi_handle_debug(struct _ddebug *descriptor, acpi_handle handle, | |
603 | const char *fmt, ...) | |
604 | { | |
605 | struct va_format vaf; | |
606 | va_list args; | |
607 | const char *path; | |
608 | ||
609 | va_start(args, fmt); | |
610 | vaf.fmt = fmt; | |
611 | vaf.va = &args; | |
612 | ||
613 | path = acpi_handle_path(handle); | |
614 | __dynamic_pr_debug(descriptor, "ACPI: %s: %pV", path ? path : "<n/a>", &vaf); | |
615 | ||
616 | va_end(args); | |
617 | kfree(path); | |
618 | } | |
619 | EXPORT_SYMBOL(__acpi_handle_debug); | |
620 | #endif | |
621 | ||
4c324548 RW |
622 | /** |
623 | * acpi_evaluation_failure_warn - Log evaluation failure warning. | |
624 | * @handle: Parent object handle. | |
625 | * @name: Name of the object whose evaluation has failed. | |
626 | * @status: Status value returned by the failing object evaluation. | |
627 | */ | |
628 | void acpi_evaluation_failure_warn(acpi_handle handle, const char *name, | |
629 | acpi_status status) | |
630 | { | |
631 | acpi_handle_warn(handle, "%s evaluation failed: %s\n", name, | |
632 | acpi_format_exception(status)); | |
633 | } | |
634 | EXPORT_SYMBOL_GPL(acpi_evaluation_failure_warn); | |
635 | ||
952c63e9 JL |
636 | /** |
637 | * acpi_has_method: Check whether @handle has a method named @name | |
638 | * @handle: ACPI device handle | |
639 | * @name: name of object or method | |
640 | * | |
641 | * Check whether @handle has a method named @name. | |
642 | */ | |
643 | bool acpi_has_method(acpi_handle handle, char *name) | |
644 | { | |
645 | acpi_handle tmp; | |
646 | ||
647 | return ACPI_SUCCESS(acpi_get_handle(handle, name, &tmp)); | |
648 | } | |
649 | EXPORT_SYMBOL(acpi_has_method); | |
0db98202 JL |
650 | |
651 | acpi_status acpi_execute_simple_method(acpi_handle handle, char *method, | |
652 | u64 arg) | |
653 | { | |
654 | union acpi_object obj = { .type = ACPI_TYPE_INTEGER }; | |
655 | struct acpi_object_list arg_list = { .count = 1, .pointer = &obj, }; | |
656 | ||
657 | obj.integer.value = arg; | |
658 | ||
659 | return acpi_evaluate_object(handle, method, &arg_list, NULL); | |
660 | } | |
661 | EXPORT_SYMBOL(acpi_execute_simple_method); | |
7d2421f8 JL |
662 | |
663 | /** | |
664 | * acpi_evaluate_ej0: Evaluate _EJ0 method for hotplug operations | |
665 | * @handle: ACPI device handle | |
666 | * | |
667 | * Evaluate device's _EJ0 method for hotplug operations. | |
668 | */ | |
669 | acpi_status acpi_evaluate_ej0(acpi_handle handle) | |
670 | { | |
671 | acpi_status status; | |
672 | ||
673 | status = acpi_execute_simple_method(handle, "_EJ0", 1); | |
674 | if (status == AE_NOT_FOUND) | |
675 | acpi_handle_warn(handle, "No _EJ0 support for device\n"); | |
676 | else if (ACPI_FAILURE(status)) | |
677 | acpi_handle_warn(handle, "Eject failed (0x%x)\n", status); | |
678 | ||
679 | return status; | |
680 | } | |
681 | ||
682 | /** | |
683 | * acpi_evaluate_lck: Evaluate _LCK method to lock/unlock device | |
684 | * @handle: ACPI device handle | |
685 | * @lock: lock device if non-zero, otherwise unlock device | |
686 | * | |
687 | * Evaluate device's _LCK method if present to lock/unlock device | |
688 | */ | |
689 | acpi_status acpi_evaluate_lck(acpi_handle handle, int lock) | |
690 | { | |
691 | acpi_status status; | |
692 | ||
693 | status = acpi_execute_simple_method(handle, "_LCK", !!lock); | |
694 | if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) { | |
695 | if (lock) | |
696 | acpi_handle_warn(handle, | |
697 | "Locking device failed (0x%x)\n", status); | |
698 | else | |
699 | acpi_handle_warn(handle, | |
700 | "Unlocking device failed (0x%x)\n", status); | |
701 | } | |
702 | ||
703 | return status; | |
704 | } | |
a65ac520 | 705 | |
132565d8 HG |
706 | /** |
707 | * acpi_evaluate_reg: Evaluate _REG method to register OpRegion presence | |
708 | * @handle: ACPI device handle | |
709 | * @space_id: ACPI address space id to register OpRegion presence for | |
710 | * @function: Parameter to pass to _REG one of ACPI_REG_CONNECT or | |
711 | * ACPI_REG_DISCONNECT | |
712 | * | |
713 | * Evaluate device's _REG method to register OpRegion presence. | |
714 | */ | |
715 | acpi_status acpi_evaluate_reg(acpi_handle handle, u8 space_id, u32 function) | |
716 | { | |
717 | struct acpi_object_list arg_list; | |
718 | union acpi_object params[2]; | |
719 | ||
720 | params[0].type = ACPI_TYPE_INTEGER; | |
721 | params[0].integer.value = space_id; | |
722 | params[1].type = ACPI_TYPE_INTEGER; | |
723 | params[1].integer.value = function; | |
724 | arg_list.count = 2; | |
725 | arg_list.pointer = params; | |
726 | ||
727 | return acpi_evaluate_object(handle, "_REG", &arg_list, NULL); | |
728 | } | |
729 | EXPORT_SYMBOL(acpi_evaluate_reg); | |
730 | ||
a65ac520 JL |
731 | /** |
732 | * acpi_evaluate_dsm - evaluate device's _DSM method | |
733 | * @handle: ACPI device handle | |
94116f81 | 734 | * @guid: GUID of requested functions, should be 16 bytes |
a65ac520 JL |
735 | * @rev: revision number of requested function |
736 | * @func: requested function number | |
737 | * @argv4: the function specific parameter | |
738 | * | |
94116f81 | 739 | * Evaluate device's _DSM method with specified GUID, revision id and |
a65ac520 JL |
740 | * function number. Caller needs to free the returned object. |
741 | * | |
742 | * Though ACPI defines the fourth parameter for _DSM should be a package, | |
743 | * some old BIOSes do expect a buffer or an integer etc. | |
744 | */ | |
745 | union acpi_object * | |
94116f81 | 746 | acpi_evaluate_dsm(acpi_handle handle, const guid_t *guid, u64 rev, u64 func, |
a65ac520 JL |
747 | union acpi_object *argv4) |
748 | { | |
749 | acpi_status ret; | |
750 | struct acpi_buffer buf = {ACPI_ALLOCATE_BUFFER, NULL}; | |
751 | union acpi_object params[4]; | |
752 | struct acpi_object_list input = { | |
753 | .count = 4, | |
754 | .pointer = params, | |
755 | }; | |
756 | ||
757 | params[0].type = ACPI_TYPE_BUFFER; | |
758 | params[0].buffer.length = 16; | |
94116f81 | 759 | params[0].buffer.pointer = (u8 *)guid; |
a65ac520 JL |
760 | params[1].type = ACPI_TYPE_INTEGER; |
761 | params[1].integer.value = rev; | |
762 | params[2].type = ACPI_TYPE_INTEGER; | |
763 | params[2].integer.value = func; | |
764 | if (argv4) { | |
765 | params[3] = *argv4; | |
766 | } else { | |
767 | params[3].type = ACPI_TYPE_PACKAGE; | |
768 | params[3].package.count = 0; | |
769 | params[3].package.elements = NULL; | |
770 | } | |
771 | ||
772 | ret = acpi_evaluate_object(handle, "_DSM", &input, &buf); | |
773 | if (ACPI_SUCCESS(ret)) | |
774 | return (union acpi_object *)buf.pointer; | |
775 | ||
776 | if (ret != AE_NOT_FOUND) | |
777 | acpi_handle_warn(handle, | |
06eb8dc0 | 778 | "failed to evaluate _DSM %pUb (0x%x)\n", guid, ret); |
a65ac520 JL |
779 | |
780 | return NULL; | |
781 | } | |
782 | EXPORT_SYMBOL(acpi_evaluate_dsm); | |
783 | ||
784 | /** | |
785 | * acpi_check_dsm - check if _DSM method supports requested functions. | |
786 | * @handle: ACPI device handle | |
94116f81 | 787 | * @guid: GUID of requested functions, should be 16 bytes at least |
a65ac520 JL |
788 | * @rev: revision number of requested functions |
789 | * @funcs: bitmap of requested functions | |
a65ac520 JL |
790 | * |
791 | * Evaluate device's _DSM method to check whether it supports requested | |
792 | * functions. Currently only support 64 functions at maximum, should be | |
793 | * enough for now. | |
794 | */ | |
94116f81 | 795 | bool acpi_check_dsm(acpi_handle handle, const guid_t *guid, u64 rev, u64 funcs) |
a65ac520 JL |
796 | { |
797 | int i; | |
798 | u64 mask = 0; | |
799 | union acpi_object *obj; | |
800 | ||
a7225598 DW |
801 | if (funcs == 0) |
802 | return false; | |
803 | ||
94116f81 | 804 | obj = acpi_evaluate_dsm(handle, guid, rev, 0, NULL); |
a65ac520 JL |
805 | if (!obj) |
806 | return false; | |
807 | ||
808 | /* For compatibility, old BIOSes may return an integer */ | |
809 | if (obj->type == ACPI_TYPE_INTEGER) | |
810 | mask = obj->integer.value; | |
811 | else if (obj->type == ACPI_TYPE_BUFFER) | |
812 | for (i = 0; i < obj->buffer.length && i < 8; i++) | |
4a798f50 | 813 | mask |= (((u64)obj->buffer.pointer[i]) << (i * 8)); |
a65ac520 JL |
814 | ACPI_FREE(obj); |
815 | ||
816 | /* | |
817 | * Bit 0 indicates whether there's support for any functions other than | |
94116f81 | 818 | * function 0 for the specified GUID and revision. |
a65ac520 JL |
819 | */ |
820 | if ((mask & 0x1) && (mask & funcs) == funcs) | |
821 | return true; | |
822 | ||
823 | return false; | |
824 | } | |
825 | EXPORT_SYMBOL(acpi_check_dsm); | |
14ca7a47 | 826 | |
a3a62ca2 RJ |
827 | /** |
828 | * acpi_dev_uid_match - Match device by supplied UID | |
829 | * @adev: ACPI device to match. | |
830 | * @uid2: Unique ID of the device. | |
831 | * | |
832 | * Matches UID in @adev with given @uid2. | |
833 | * | |
834 | * Returns: | |
835 | * - %true if matches. | |
836 | * - %false otherwise. | |
837 | */ | |
838 | bool acpi_dev_uid_match(struct acpi_device *adev, const char *uid2) | |
839 | { | |
840 | const char *uid1 = acpi_device_uid(adev); | |
841 | ||
842 | return uid1 && uid2 && !strcmp(uid1, uid2); | |
843 | } | |
844 | EXPORT_SYMBOL_GPL(acpi_dev_uid_match); | |
845 | ||
35009c80 AS |
846 | /** |
847 | * acpi_dev_hid_uid_match - Match device by supplied HID and UID | |
848 | * @adev: ACPI device to match. | |
849 | * @hid2: Hardware ID of the device. | |
850 | * @uid2: Unique ID of the device, pass NULL to not check _UID. | |
851 | * | |
a3a62ca2 RJ |
852 | * Matches HID and UID in @adev with given @hid2 and @uid2. Absence of @uid2 |
853 | * will be treated as a match. If user wants to validate @uid2, it should be | |
854 | * done before calling this function. | |
855 | * | |
856 | * Returns: | |
857 | * - %true if matches or @uid2 is NULL. | |
858 | * - %false otherwise. | |
35009c80 AS |
859 | */ |
860 | bool acpi_dev_hid_uid_match(struct acpi_device *adev, | |
861 | const char *hid2, const char *uid2) | |
862 | { | |
863 | const char *hid1 = acpi_device_hid(adev); | |
35009c80 AS |
864 | |
865 | if (strcmp(hid1, hid2)) | |
866 | return false; | |
867 | ||
868 | if (!uid2) | |
869 | return true; | |
870 | ||
a3a62ca2 | 871 | return acpi_dev_uid_match(adev, uid2); |
35009c80 AS |
872 | } |
873 | EXPORT_SYMBOL(acpi_dev_hid_uid_match); | |
874 | ||
5db72fdb AS |
875 | /** |
876 | * acpi_dev_uid_to_integer - treat ACPI device _UID as integer | |
877 | * @adev: ACPI device to get _UID from | |
878 | * @integer: output buffer for integer | |
879 | * | |
880 | * Considers _UID as integer and converts it to @integer. | |
881 | * | |
882 | * Returns 0 on success, or negative error code otherwise. | |
883 | */ | |
884 | int acpi_dev_uid_to_integer(struct acpi_device *adev, u64 *integer) | |
885 | { | |
886 | const char *uid; | |
887 | ||
888 | if (!adev) | |
889 | return -ENODEV; | |
890 | ||
891 | uid = acpi_device_uid(adev); | |
892 | if (!uid) | |
893 | return -ENODATA; | |
894 | ||
895 | return kstrtou64(uid, 0, integer); | |
896 | } | |
897 | EXPORT_SYMBOL(acpi_dev_uid_to_integer); | |
898 | ||
2d12b6b3 | 899 | /** |
c68ae33e | 900 | * acpi_dev_found - Detect presence of a given ACPI device in the namespace. |
2d12b6b3 LW |
901 | * @hid: Hardware ID of the device. |
902 | * | |
903 | * Return %true if the device was present at the moment of invocation. | |
904 | * Note that if the device is pluggable, it may since have disappeared. | |
905 | * | |
906 | * For this function to work, acpi_bus_scan() must have been executed | |
907 | * which happens in the subsys_initcall() subsection. Hence, do not | |
908 | * call from a subsys_initcall() or earlier (use acpi_get_devices() | |
909 | * instead). Calling from module_init() is fine (which is synonymous | |
910 | * with device_initcall()). | |
911 | */ | |
c68ae33e | 912 | bool acpi_dev_found(const char *hid) |
2d12b6b3 LW |
913 | { |
914 | struct acpi_device_bus_id *acpi_device_bus_id; | |
915 | bool found = false; | |
916 | ||
917 | mutex_lock(&acpi_device_lock); | |
918 | list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) | |
919 | if (!strcmp(acpi_device_bus_id->bus_id, hid)) { | |
920 | found = true; | |
921 | break; | |
922 | } | |
923 | mutex_unlock(&acpi_device_lock); | |
924 | ||
925 | return found; | |
926 | } | |
c68ae33e | 927 | EXPORT_SYMBOL(acpi_dev_found); |
2d12b6b3 | 928 | |
67dcf8a3 | 929 | struct acpi_dev_match_info { |
8661423e HG |
930 | struct acpi_device_id hid[2]; |
931 | const char *uid; | |
932 | s64 hrv; | |
933 | }; | |
934 | ||
418e3ea1 | 935 | static int acpi_dev_match_cb(struct device *dev, const void *data) |
8661423e HG |
936 | { |
937 | struct acpi_device *adev = to_acpi_device(dev); | |
418e3ea1 | 938 | const struct acpi_dev_match_info *match = data; |
8661423e HG |
939 | unsigned long long hrv; |
940 | acpi_status status; | |
941 | ||
942 | if (acpi_match_device_ids(adev, match->hid)) | |
943 | return 0; | |
944 | ||
3a3cc546 | 945 | if (match->uid && !acpi_dev_uid_match(adev, match->uid)) |
8661423e HG |
946 | return 0; |
947 | ||
948 | if (match->hrv == -1) | |
949 | return 1; | |
950 | ||
951 | status = acpi_evaluate_integer(adev->handle, "_HRV", NULL, &hrv); | |
952 | if (ACPI_FAILURE(status)) | |
953 | return 0; | |
954 | ||
955 | return hrv == match->hrv; | |
956 | } | |
957 | ||
958 | /** | |
959 | * acpi_dev_present - Detect that a given ACPI device is present | |
960 | * @hid: Hardware ID of the device. | |
961 | * @uid: Unique ID of the device, pass NULL to not check _UID | |
962 | * @hrv: Hardware Revision of the device, pass -1 to not check _HRV | |
963 | * | |
964 | * Return %true if a matching device was present at the moment of invocation. | |
965 | * Note that if the device is pluggable, it may since have disappeared. | |
966 | * | |
967 | * Note that unlike acpi_dev_found() this function checks the status | |
e7b07d3e | 968 | * of the device. So for devices which are present in the DSDT, but |
8661423e HG |
969 | * which are disabled (their _STA callback returns 0) this function |
970 | * will return false. | |
971 | * | |
972 | * For this function to work, acpi_bus_scan() must have been executed | |
973 | * which happens in the subsys_initcall() subsection. Hence, do not | |
974 | * call from a subsys_initcall() or earlier (use acpi_get_devices() | |
975 | * instead). Calling from module_init() is fine (which is synonymous | |
976 | * with device_initcall()). | |
977 | */ | |
978 | bool acpi_dev_present(const char *hid, const char *uid, s64 hrv) | |
979 | { | |
67dcf8a3 | 980 | struct acpi_dev_match_info match = {}; |
8661423e HG |
981 | struct device *dev; |
982 | ||
b75d2cd0 | 983 | strscpy(match.hid[0].id, hid, sizeof(match.hid[0].id)); |
8661423e HG |
984 | match.uid = uid; |
985 | match.hrv = hrv; | |
986 | ||
67dcf8a3 | 987 | dev = bus_find_device(&acpi_bus_type, NULL, &match, acpi_dev_match_cb); |
54e3aca8 | 988 | put_device(dev); |
8661423e HG |
989 | return !!dev; |
990 | } | |
991 | EXPORT_SYMBOL(acpi_dev_present); | |
992 | ||
67dcf8a3 | 993 | /** |
bf263f64 | 994 | * acpi_dev_get_next_match_dev - Return the next match of ACPI device |
e7b07d3e | 995 | * @adev: Pointer to the previous ACPI device matching this @hid, @uid and @hrv |
67dcf8a3 AS |
996 | * @hid: Hardware ID of the device. |
997 | * @uid: Unique ID of the device, pass NULL to not check _UID | |
998 | * @hrv: Hardware Revision of the device, pass -1 to not check _HRV | |
999 | * | |
bf263f64 | 1000 | * Return the next match of ACPI device if another matching device was present |
67dcf8a3 AS |
1001 | * at the moment of invocation, or NULL otherwise. |
1002 | * | |
81eeb2f5 | 1003 | * The caller is responsible for invoking acpi_dev_put() on the returned device. |
71f64283 AS |
1004 | * On the other hand the function invokes acpi_dev_put() on the given @adev |
1005 | * assuming that its reference counter had been increased beforehand. | |
817b4d64 | 1006 | * |
67dcf8a3 AS |
1007 | * See additional information in acpi_dev_present() as well. |
1008 | */ | |
817b4d64 | 1009 | struct acpi_device * |
bf263f64 | 1010 | acpi_dev_get_next_match_dev(struct acpi_device *adev, const char *hid, const char *uid, s64 hrv) |
817b4d64 | 1011 | { |
bf263f64 | 1012 | struct device *start = adev ? &adev->dev : NULL; |
817b4d64 AS |
1013 | struct acpi_dev_match_info match = {}; |
1014 | struct device *dev; | |
1015 | ||
b75d2cd0 | 1016 | strscpy(match.hid[0].id, hid, sizeof(match.hid[0].id)); |
817b4d64 AS |
1017 | match.uid = uid; |
1018 | match.hrv = hrv; | |
1019 | ||
bf263f64 | 1020 | dev = bus_find_device(&acpi_bus_type, start, &match, acpi_dev_match_cb); |
71f64283 | 1021 | acpi_dev_put(adev); |
e6374f6b | 1022 | return dev ? to_acpi_device(dev) : NULL; |
817b4d64 | 1023 | } |
bf263f64 DS |
1024 | EXPORT_SYMBOL(acpi_dev_get_next_match_dev); |
1025 | ||
1026 | /** | |
1027 | * acpi_dev_get_first_match_dev - Return the first match of ACPI device | |
1028 | * @hid: Hardware ID of the device. | |
1029 | * @uid: Unique ID of the device, pass NULL to not check _UID | |
1030 | * @hrv: Hardware Revision of the device, pass -1 to not check _HRV | |
1031 | * | |
1032 | * Return the first match of ACPI device if a matching device was present | |
1033 | * at the moment of invocation, or NULL otherwise. | |
1034 | * | |
81eeb2f5 | 1035 | * The caller is responsible for invoking acpi_dev_put() on the returned device. |
bf263f64 DS |
1036 | * |
1037 | * See additional information in acpi_dev_present() as well. | |
1038 | */ | |
1039 | struct acpi_device * | |
1040 | acpi_dev_get_first_match_dev(const char *hid, const char *uid, s64 hrv) | |
1041 | { | |
1042 | return acpi_dev_get_next_match_dev(NULL, hid, uid, hrv); | |
1043 | } | |
817b4d64 AS |
1044 | EXPORT_SYMBOL(acpi_dev_get_first_match_dev); |
1045 | ||
8eb99e9a HG |
1046 | /** |
1047 | * acpi_reduced_hardware - Return if this is an ACPI-reduced-hw machine | |
1048 | * | |
1049 | * Return true when running on an ACPI-reduced-hw machine, false otherwise. | |
1050 | */ | |
1051 | bool acpi_reduced_hardware(void) | |
1052 | { | |
1053 | return acpi_gbl_reduced_hardware; | |
1054 | } | |
1055 | EXPORT_SYMBOL_GPL(acpi_reduced_hardware); | |
1056 | ||
14ca7a47 HG |
1057 | /* |
1058 | * acpi_backlight= handling, this is done here rather then in video_detect.c | |
1059 | * because __setup cannot be used in modules. | |
1060 | */ | |
1061 | char acpi_video_backlight_string[16]; | |
1062 | EXPORT_SYMBOL(acpi_video_backlight_string); | |
1063 | ||
1064 | static int __init acpi_backlight(char *str) | |
1065 | { | |
b75d2cd0 | 1066 | strscpy(acpi_video_backlight_string, str, |
14ca7a47 HG |
1067 | sizeof(acpi_video_backlight_string)); |
1068 | return 1; | |
1069 | } | |
1070 | __setup("acpi_backlight=", acpi_backlight); | |
5aa5911a TK |
1071 | |
1072 | /** | |
1073 | * acpi_match_platform_list - Check if the system matches with a given list | |
1074 | * @plat: pointer to acpi_platform_list table terminated by a NULL entry | |
1075 | * | |
1076 | * Return the matched index if the system is found in the platform list. | |
1077 | * Otherwise, return a negative error code. | |
1078 | */ | |
1079 | int acpi_match_platform_list(const struct acpi_platform_list *plat) | |
1080 | { | |
1081 | struct acpi_table_header hdr; | |
1082 | int idx = 0; | |
1083 | ||
1084 | if (acpi_disabled) | |
1085 | return -ENODEV; | |
1086 | ||
1087 | for (; plat->oem_id[0]; plat++, idx++) { | |
1088 | if (ACPI_FAILURE(acpi_get_table_header(plat->table, 0, &hdr))) | |
1089 | continue; | |
1090 | ||
1091 | if (strncmp(plat->oem_id, hdr.oem_id, ACPI_OEM_ID_SIZE)) | |
1092 | continue; | |
1093 | ||
1094 | if (strncmp(plat->oem_table_id, hdr.oem_table_id, ACPI_OEM_TABLE_ID_SIZE)) | |
1095 | continue; | |
1096 | ||
1097 | if ((plat->pred == all_versions) || | |
1098 | (plat->pred == less_than_or_equal && hdr.oem_revision <= plat->oem_revision) || | |
1099 | (plat->pred == greater_than_or_equal && hdr.oem_revision >= plat->oem_revision) || | |
1100 | (plat->pred == equal && hdr.oem_revision == plat->oem_revision)) | |
1101 | return idx; | |
1102 | } | |
1103 | ||
1104 | return -ENODEV; | |
1105 | } | |
1106 | EXPORT_SYMBOL(acpi_match_platform_list); |