Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * acpi_utils.c - ACPI Utility Functions ($Revision: 10 $) | |
3 | * | |
4 | * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com> | |
5 | * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com> | |
6 | * | |
7 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License as published by | |
11 | * the Free Software Foundation; either version 2 of the License, or (at | |
12 | * your option) any later version. | |
13 | * | |
14 | * This program is distributed in the hope that it will be useful, but | |
15 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
17 | * General Public License for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU General Public License along | |
20 | * with this program; if not, write to the Free Software Foundation, Inc., | |
21 | * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. | |
22 | * | |
23 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
24 | */ | |
25 | ||
26 | #include <linux/kernel.h> | |
27 | #include <linux/module.h> | |
5a0e3ad6 | 28 | #include <linux/slab.h> |
1da177e4 LT |
29 | #include <linux/init.h> |
30 | #include <linux/types.h> | |
fbfddae6 TK |
31 | #include <linux/hardirq.h> |
32 | #include <linux/acpi.h> | |
45fef5b8 | 33 | #include <linux/dynamic_debug.h> |
1da177e4 | 34 | |
a192a958 LB |
35 | #include "internal.h" |
36 | ||
1da177e4 | 37 | #define _COMPONENT ACPI_BUS_COMPONENT |
f52fd66d | 38 | ACPI_MODULE_NAME("utils"); |
1da177e4 LT |
39 | |
40 | /* -------------------------------------------------------------------------- | |
41 | Object Evaluation Helpers | |
42 | -------------------------------------------------------------------------- */ | |
4fd7f518 HH |
43 | static void |
44 | acpi_util_eval_error(acpi_handle h, acpi_string p, acpi_status s) | |
45 | { | |
1da177e4 | 46 | #ifdef ACPI_DEBUG_OUTPUT |
4fd7f518 HH |
47 | char prefix[80] = {'\0'}; |
48 | struct acpi_buffer buffer = {sizeof(prefix), prefix}; | |
49 | acpi_get_name(h, ACPI_FULL_PATHNAME, &buffer); | |
50 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Evaluate [%s.%s]: %s\n", | |
51 | (char *) prefix, p, acpi_format_exception(s))); | |
1da177e4 | 52 | #else |
4fd7f518 | 53 | return; |
1da177e4 | 54 | #endif |
4fd7f518 HH |
55 | } |
56 | ||
1da177e4 | 57 | acpi_status |
4be44fcd LB |
58 | acpi_extract_package(union acpi_object *package, |
59 | struct acpi_buffer *format, struct acpi_buffer *buffer) | |
1da177e4 | 60 | { |
4be44fcd LB |
61 | u32 size_required = 0; |
62 | u32 tail_offset = 0; | |
63 | char *format_string = NULL; | |
64 | u32 format_count = 0; | |
65 | u32 i = 0; | |
66 | u8 *head = NULL; | |
67 | u8 *tail = NULL; | |
1da177e4 | 68 | |
1da177e4 | 69 | |
4be44fcd LB |
70 | if (!package || (package->type != ACPI_TYPE_PACKAGE) |
71 | || (package->package.count < 1)) { | |
cece9296 | 72 | printk(KERN_WARNING PREFIX "Invalid package argument\n"); |
d550d98d | 73 | return AE_BAD_PARAMETER; |
1da177e4 LT |
74 | } |
75 | ||
76 | if (!format || !format->pointer || (format->length < 1)) { | |
cece9296 | 77 | printk(KERN_WARNING PREFIX "Invalid format argument\n"); |
d550d98d | 78 | return AE_BAD_PARAMETER; |
1da177e4 LT |
79 | } |
80 | ||
81 | if (!buffer) { | |
cece9296 | 82 | printk(KERN_WARNING PREFIX "Invalid buffer argument\n"); |
d550d98d | 83 | return AE_BAD_PARAMETER; |
1da177e4 LT |
84 | } |
85 | ||
4be44fcd | 86 | format_count = (format->length / sizeof(char)) - 1; |
1da177e4 | 87 | if (format_count > package->package.count) { |
cece9296 LB |
88 | printk(KERN_WARNING PREFIX "Format specifies more objects [%d]" |
89 | " than exist in package [%d].\n", | |
90 | format_count, package->package.count); | |
d550d98d | 91 | return AE_BAD_DATA; |
1da177e4 LT |
92 | } |
93 | ||
50dd0969 | 94 | format_string = format->pointer; |
1da177e4 LT |
95 | |
96 | /* | |
97 | * Calculate size_required. | |
98 | */ | |
4be44fcd | 99 | for (i = 0; i < format_count; i++) { |
1da177e4 LT |
100 | |
101 | union acpi_object *element = &(package->package.elements[i]); | |
102 | ||
1da177e4 LT |
103 | switch (element->type) { |
104 | ||
105 | case ACPI_TYPE_INTEGER: | |
106 | switch (format_string[i]) { | |
107 | case 'N': | |
439913ff LM |
108 | size_required += sizeof(u64); |
109 | tail_offset += sizeof(u64); | |
1da177e4 LT |
110 | break; |
111 | case 'S': | |
4be44fcd | 112 | size_required += |
439913ff | 113 | sizeof(char *) + sizeof(u64) + |
4be44fcd LB |
114 | sizeof(char); |
115 | tail_offset += sizeof(char *); | |
1da177e4 LT |
116 | break; |
117 | default: | |
cece9296 | 118 | printk(KERN_WARNING PREFIX "Invalid package element" |
e7e92ec9 | 119 | " [%d]: got number, expecting" |
cece9296 LB |
120 | " [%c]\n", |
121 | i, format_string[i]); | |
d550d98d | 122 | return AE_BAD_DATA; |
1da177e4 LT |
123 | break; |
124 | } | |
125 | break; | |
126 | ||
127 | case ACPI_TYPE_STRING: | |
128 | case ACPI_TYPE_BUFFER: | |
129 | switch (format_string[i]) { | |
130 | case 'S': | |
4be44fcd LB |
131 | size_required += |
132 | sizeof(char *) + | |
133 | (element->string.length * sizeof(char)) + | |
134 | sizeof(char); | |
135 | tail_offset += sizeof(char *); | |
1da177e4 LT |
136 | break; |
137 | case 'B': | |
4be44fcd LB |
138 | size_required += |
139 | sizeof(u8 *) + | |
140 | (element->buffer.length * sizeof(u8)); | |
141 | tail_offset += sizeof(u8 *); | |
1da177e4 LT |
142 | break; |
143 | default: | |
cece9296 | 144 | printk(KERN_WARNING PREFIX "Invalid package element" |
a6fc6720 | 145 | " [%d] got string/buffer," |
e7e92ec9 | 146 | " expecting [%c]\n", |
cece9296 | 147 | i, format_string[i]); |
d550d98d | 148 | return AE_BAD_DATA; |
1da177e4 LT |
149 | break; |
150 | } | |
151 | break; | |
e3ec483a ZR |
152 | case ACPI_TYPE_LOCAL_REFERENCE: |
153 | switch (format_string[i]) { | |
154 | case 'R': | |
155 | size_required += sizeof(void *); | |
156 | tail_offset += sizeof(void *); | |
157 | break; | |
158 | default: | |
159 | printk(KERN_WARNING PREFIX "Invalid package element" | |
160 | " [%d] got reference," | |
161 | " expecting [%c]\n", | |
162 | i, format_string[i]); | |
163 | return AE_BAD_DATA; | |
164 | break; | |
165 | } | |
166 | break; | |
1da177e4 LT |
167 | |
168 | case ACPI_TYPE_PACKAGE: | |
169 | default: | |
4be44fcd LB |
170 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
171 | "Found unsupported element at index=%d\n", | |
172 | i)); | |
1da177e4 | 173 | /* TBD: handle nested packages... */ |
d550d98d | 174 | return AE_SUPPORT; |
1da177e4 LT |
175 | break; |
176 | } | |
177 | } | |
178 | ||
179 | /* | |
180 | * Validate output buffer. | |
181 | */ | |
e83dda06 | 182 | if (buffer->length == ACPI_ALLOCATE_BUFFER) { |
2d0acb4a | 183 | buffer->pointer = ACPI_ALLOCATE_ZEROED(size_required); |
e83dda06 AS |
184 | if (!buffer->pointer) |
185 | return AE_NO_MEMORY; | |
1da177e4 | 186 | buffer->length = size_required; |
e83dda06 AS |
187 | } else { |
188 | if (buffer->length < size_required) { | |
189 | buffer->length = size_required; | |
190 | return AE_BUFFER_OVERFLOW; | |
191 | } else if (buffer->length != size_required || | |
192 | !buffer->pointer) { | |
193 | return AE_BAD_PARAMETER; | |
194 | } | |
1da177e4 LT |
195 | } |
196 | ||
197 | head = buffer->pointer; | |
198 | tail = buffer->pointer + tail_offset; | |
199 | ||
200 | /* | |
201 | * Extract package data. | |
202 | */ | |
4be44fcd | 203 | for (i = 0; i < format_count; i++) { |
1da177e4 LT |
204 | |
205 | u8 **pointer = NULL; | |
206 | union acpi_object *element = &(package->package.elements[i]); | |
207 | ||
208 | if (!element) { | |
d550d98d | 209 | return AE_BAD_DATA; |
1da177e4 LT |
210 | } |
211 | ||
212 | switch (element->type) { | |
213 | ||
214 | case ACPI_TYPE_INTEGER: | |
215 | switch (format_string[i]) { | |
216 | case 'N': | |
439913ff | 217 | *((u64 *) head) = |
4be44fcd | 218 | element->integer.value; |
439913ff | 219 | head += sizeof(u64); |
1da177e4 LT |
220 | break; |
221 | case 'S': | |
4be44fcd | 222 | pointer = (u8 **) head; |
1da177e4 | 223 | *pointer = tail; |
439913ff | 224 | *((u64 *) tail) = |
4be44fcd | 225 | element->integer.value; |
439913ff LM |
226 | head += sizeof(u64 *); |
227 | tail += sizeof(u64); | |
1da177e4 LT |
228 | /* NULL terminate string */ |
229 | *tail = (char)0; | |
230 | tail += sizeof(char); | |
231 | break; | |
232 | default: | |
233 | /* Should never get here */ | |
234 | break; | |
235 | } | |
236 | break; | |
237 | ||
238 | case ACPI_TYPE_STRING: | |
239 | case ACPI_TYPE_BUFFER: | |
240 | switch (format_string[i]) { | |
241 | case 'S': | |
4be44fcd | 242 | pointer = (u8 **) head; |
1da177e4 | 243 | *pointer = tail; |
4be44fcd LB |
244 | memcpy(tail, element->string.pointer, |
245 | element->string.length); | |
246 | head += sizeof(char *); | |
1da177e4 LT |
247 | tail += element->string.length * sizeof(char); |
248 | /* NULL terminate string */ | |
249 | *tail = (char)0; | |
250 | tail += sizeof(char); | |
251 | break; | |
252 | case 'B': | |
4be44fcd | 253 | pointer = (u8 **) head; |
1da177e4 | 254 | *pointer = tail; |
4be44fcd LB |
255 | memcpy(tail, element->buffer.pointer, |
256 | element->buffer.length); | |
257 | head += sizeof(u8 *); | |
1da177e4 LT |
258 | tail += element->buffer.length * sizeof(u8); |
259 | break; | |
260 | default: | |
261 | /* Should never get here */ | |
262 | break; | |
263 | } | |
264 | break; | |
e3ec483a ZR |
265 | case ACPI_TYPE_LOCAL_REFERENCE: |
266 | switch (format_string[i]) { | |
267 | case 'R': | |
268 | *(void **)head = | |
269 | (void *)element->reference.handle; | |
270 | head += sizeof(void *); | |
271 | break; | |
272 | default: | |
273 | /* Should never get here */ | |
274 | break; | |
275 | } | |
276 | break; | |
1da177e4 LT |
277 | case ACPI_TYPE_PACKAGE: |
278 | /* TBD: handle nested packages... */ | |
279 | default: | |
280 | /* Should never get here */ | |
281 | break; | |
282 | } | |
283 | } | |
284 | ||
d550d98d | 285 | return AE_OK; |
1da177e4 | 286 | } |
1da177e4 | 287 | |
4be44fcd | 288 | EXPORT_SYMBOL(acpi_extract_package); |
1da177e4 LT |
289 | |
290 | acpi_status | |
4be44fcd LB |
291 | acpi_evaluate_integer(acpi_handle handle, |
292 | acpi_string pathname, | |
27663c58 | 293 | struct acpi_object_list *arguments, unsigned long long *data) |
1da177e4 | 294 | { |
4be44fcd | 295 | acpi_status status = AE_OK; |
40599072 | 296 | union acpi_object element; |
4be44fcd | 297 | struct acpi_buffer buffer = { 0, NULL }; |
1da177e4 | 298 | |
1da177e4 | 299 | if (!data) |
d550d98d | 300 | return AE_BAD_PARAMETER; |
1da177e4 | 301 | |
1da177e4 | 302 | buffer.length = sizeof(union acpi_object); |
40599072 | 303 | buffer.pointer = &element; |
1da177e4 LT |
304 | status = acpi_evaluate_object(handle, pathname, arguments, &buffer); |
305 | if (ACPI_FAILURE(status)) { | |
306 | acpi_util_eval_error(handle, pathname, status); | |
d550d98d | 307 | return status; |
1da177e4 LT |
308 | } |
309 | ||
40599072 | 310 | if (element.type != ACPI_TYPE_INTEGER) { |
1da177e4 | 311 | acpi_util_eval_error(handle, pathname, AE_BAD_DATA); |
d550d98d | 312 | return AE_BAD_DATA; |
1da177e4 LT |
313 | } |
314 | ||
40599072 | 315 | *data = element.integer.value; |
1da177e4 | 316 | |
27663c58 | 317 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Return value [%llu]\n", *data)); |
1da177e4 | 318 | |
d550d98d | 319 | return AE_OK; |
1da177e4 | 320 | } |
1da177e4 | 321 | |
4be44fcd | 322 | EXPORT_SYMBOL(acpi_evaluate_integer); |
1da177e4 | 323 | |
1da177e4 | 324 | acpi_status |
4be44fcd LB |
325 | acpi_evaluate_reference(acpi_handle handle, |
326 | acpi_string pathname, | |
327 | struct acpi_object_list *arguments, | |
328 | struct acpi_handle_list *list) | |
1da177e4 | 329 | { |
4be44fcd LB |
330 | acpi_status status = AE_OK; |
331 | union acpi_object *package = NULL; | |
332 | union acpi_object *element = NULL; | |
333 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
334 | u32 i = 0; | |
1da177e4 | 335 | |
1da177e4 LT |
336 | |
337 | if (!list) { | |
d550d98d | 338 | return AE_BAD_PARAMETER; |
1da177e4 LT |
339 | } |
340 | ||
341 | /* Evaluate object. */ | |
342 | ||
343 | status = acpi_evaluate_object(handle, pathname, arguments, &buffer); | |
344 | if (ACPI_FAILURE(status)) | |
345 | goto end; | |
346 | ||
50dd0969 | 347 | package = buffer.pointer; |
1da177e4 LT |
348 | |
349 | if ((buffer.length == 0) || !package) { | |
6468463a LB |
350 | printk(KERN_ERR PREFIX "No return object (len %X ptr %p)\n", |
351 | (unsigned)buffer.length, package); | |
1da177e4 LT |
352 | status = AE_BAD_DATA; |
353 | acpi_util_eval_error(handle, pathname, status); | |
354 | goto end; | |
355 | } | |
356 | if (package->type != ACPI_TYPE_PACKAGE) { | |
6468463a LB |
357 | printk(KERN_ERR PREFIX "Expecting a [Package], found type %X\n", |
358 | package->type); | |
1da177e4 LT |
359 | status = AE_BAD_DATA; |
360 | acpi_util_eval_error(handle, pathname, status); | |
361 | goto end; | |
362 | } | |
363 | if (!package->package.count) { | |
6468463a LB |
364 | printk(KERN_ERR PREFIX "[Package] has zero elements (%p)\n", |
365 | package); | |
1da177e4 LT |
366 | status = AE_BAD_DATA; |
367 | acpi_util_eval_error(handle, pathname, status); | |
368 | goto end; | |
369 | } | |
370 | ||
371 | if (package->package.count > ACPI_MAX_HANDLES) { | |
d550d98d | 372 | return AE_NO_MEMORY; |
1da177e4 LT |
373 | } |
374 | list->count = package->package.count; | |
375 | ||
376 | /* Extract package data. */ | |
377 | ||
378 | for (i = 0; i < list->count; i++) { | |
379 | ||
380 | element = &(package->package.elements[i]); | |
381 | ||
cd0b2248 | 382 | if (element->type != ACPI_TYPE_LOCAL_REFERENCE) { |
1da177e4 | 383 | status = AE_BAD_DATA; |
6468463a LB |
384 | printk(KERN_ERR PREFIX |
385 | "Expecting a [Reference] package element, found type %X\n", | |
386 | element->type); | |
1da177e4 LT |
387 | acpi_util_eval_error(handle, pathname, status); |
388 | break; | |
389 | } | |
390 | ||
b6a16387 TR |
391 | if (!element->reference.handle) { |
392 | printk(KERN_WARNING PREFIX "Invalid reference in" | |
393 | " package %s\n", pathname); | |
394 | status = AE_NULL_ENTRY; | |
395 | break; | |
396 | } | |
1da177e4 LT |
397 | /* Get the acpi_handle. */ |
398 | ||
399 | list->handles[i] = element->reference.handle; | |
400 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found reference [%p]\n", | |
4be44fcd | 401 | list->handles[i])); |
1da177e4 LT |
402 | } |
403 | ||
4be44fcd | 404 | end: |
1da177e4 LT |
405 | if (ACPI_FAILURE(status)) { |
406 | list->count = 0; | |
407 | //kfree(list->handles); | |
408 | } | |
409 | ||
02438d87 | 410 | kfree(buffer.pointer); |
1da177e4 | 411 | |
d550d98d | 412 | return status; |
1da177e4 | 413 | } |
1da177e4 | 414 | |
4be44fcd | 415 | EXPORT_SYMBOL(acpi_evaluate_reference); |
38ac0f1b MG |
416 | |
417 | acpi_status | |
8ede06ab | 418 | acpi_get_physical_device_location(acpi_handle handle, struct acpi_pld_info **pld) |
38ac0f1b MG |
419 | { |
420 | acpi_status status; | |
421 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
422 | union acpi_object *output; | |
423 | ||
424 | status = acpi_evaluate_object(handle, "_PLD", NULL, &buffer); | |
425 | ||
426 | if (ACPI_FAILURE(status)) | |
427 | return status; | |
428 | ||
429 | output = buffer.pointer; | |
430 | ||
431 | if (!output || output->type != ACPI_TYPE_PACKAGE | |
432 | || !output->package.count | |
433 | || output->package.elements[0].type != ACPI_TYPE_BUFFER | |
8ede06ab | 434 | || output->package.elements[0].buffer.length < ACPI_PLD_REV1_BUFFER_SIZE) { |
38ac0f1b MG |
435 | status = AE_TYPE; |
436 | goto out; | |
437 | } | |
438 | ||
8ede06ab FT |
439 | status = acpi_decode_pld_buffer( |
440 | output->package.elements[0].buffer.pointer, | |
441 | output->package.elements[0].buffer.length, | |
442 | pld); | |
443 | ||
38ac0f1b MG |
444 | out: |
445 | kfree(buffer.pointer); | |
446 | return status; | |
447 | } | |
448 | EXPORT_SYMBOL(acpi_get_physical_device_location); | |
275c58d7 TK |
449 | |
450 | /** | |
700b8422 | 451 | * acpi_evaluate_ost: Evaluate _OST for hotplug operations |
275c58d7 TK |
452 | * @handle: ACPI device handle |
453 | * @source_event: source event code | |
454 | * @status_code: status code | |
455 | * @status_buf: optional detailed information (NULL if none) | |
456 | * | |
457 | * Evaluate _OST for hotplug operations. All ACPI hotplug handlers | |
458 | * must call this function when evaluating _OST for hotplug operations. | |
459 | * When the platform does not support _OST, this function has no effect. | |
460 | */ | |
461 | acpi_status | |
05730c19 JL |
462 | acpi_evaluate_ost(acpi_handle handle, u32 source_event, u32 status_code, |
463 | struct acpi_buffer *status_buf) | |
275c58d7 | 464 | { |
275c58d7 TK |
465 | union acpi_object params[3] = { |
466 | {.type = ACPI_TYPE_INTEGER,}, | |
467 | {.type = ACPI_TYPE_INTEGER,}, | |
468 | {.type = ACPI_TYPE_BUFFER,} | |
469 | }; | |
470 | struct acpi_object_list arg_list = {3, params}; | |
275c58d7 TK |
471 | |
472 | params[0].integer.value = source_event; | |
473 | params[1].integer.value = status_code; | |
474 | if (status_buf != NULL) { | |
475 | params[2].buffer.pointer = status_buf->pointer; | |
476 | params[2].buffer.length = status_buf->length; | |
477 | } else { | |
478 | params[2].buffer.pointer = NULL; | |
479 | params[2].buffer.length = 0; | |
480 | } | |
481 | ||
05730c19 | 482 | return acpi_evaluate_object(handle, "_OST", &arg_list, NULL); |
275c58d7 | 483 | } |
05730c19 | 484 | EXPORT_SYMBOL(acpi_evaluate_ost); |
fbfddae6 | 485 | |
45fef5b8 BM |
486 | /** |
487 | * acpi_handle_path: Return the object path of handle | |
488 | * | |
489 | * Caller must free the returned buffer | |
490 | */ | |
491 | static char *acpi_handle_path(acpi_handle handle) | |
492 | { | |
493 | struct acpi_buffer buffer = { | |
494 | .length = ACPI_ALLOCATE_BUFFER, | |
495 | .pointer = NULL | |
496 | }; | |
497 | ||
498 | if (in_interrupt() || | |
499 | acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer) != AE_OK) | |
500 | return NULL; | |
501 | return buffer.pointer; | |
502 | } | |
503 | ||
fbfddae6 TK |
504 | /** |
505 | * acpi_handle_printk: Print message with ACPI prefix and object path | |
506 | * | |
507 | * This function is called through acpi_handle_<level> macros and prints | |
508 | * a message with ACPI prefix and object path. This function acquires | |
509 | * the global namespace mutex to obtain an object path. In interrupt | |
510 | * context, it shows the object path as <n/a>. | |
511 | */ | |
512 | void | |
513 | acpi_handle_printk(const char *level, acpi_handle handle, const char *fmt, ...) | |
514 | { | |
515 | struct va_format vaf; | |
516 | va_list args; | |
fbfddae6 TK |
517 | const char *path; |
518 | ||
519 | va_start(args, fmt); | |
520 | vaf.fmt = fmt; | |
521 | vaf.va = &args; | |
522 | ||
45fef5b8 BM |
523 | path = acpi_handle_path(handle); |
524 | printk("%sACPI: %s: %pV", level, path ? path : "<n/a>" , &vaf); | |
fbfddae6 TK |
525 | |
526 | va_end(args); | |
45fef5b8 | 527 | kfree(path); |
fbfddae6 TK |
528 | } |
529 | EXPORT_SYMBOL(acpi_handle_printk); | |
952c63e9 | 530 | |
45fef5b8 BM |
531 | #if defined(CONFIG_DYNAMIC_DEBUG) |
532 | /** | |
533 | * __acpi_handle_debug: pr_debug with ACPI prefix and object path | |
534 | * | |
535 | * This function is called through acpi_handle_debug macro and debug | |
536 | * prints a message with ACPI prefix and object path. This function | |
537 | * acquires the global namespace mutex to obtain an object path. In | |
538 | * interrupt context, it shows the object path as <n/a>. | |
539 | */ | |
540 | void | |
541 | __acpi_handle_debug(struct _ddebug *descriptor, acpi_handle handle, | |
542 | const char *fmt, ...) | |
543 | { | |
544 | struct va_format vaf; | |
545 | va_list args; | |
546 | const char *path; | |
547 | ||
548 | va_start(args, fmt); | |
549 | vaf.fmt = fmt; | |
550 | vaf.va = &args; | |
551 | ||
552 | path = acpi_handle_path(handle); | |
553 | __dynamic_pr_debug(descriptor, "ACPI: %s: %pV", path ? path : "<n/a>", &vaf); | |
554 | ||
555 | va_end(args); | |
556 | kfree(path); | |
557 | } | |
558 | EXPORT_SYMBOL(__acpi_handle_debug); | |
559 | #endif | |
560 | ||
952c63e9 JL |
561 | /** |
562 | * acpi_has_method: Check whether @handle has a method named @name | |
563 | * @handle: ACPI device handle | |
564 | * @name: name of object or method | |
565 | * | |
566 | * Check whether @handle has a method named @name. | |
567 | */ | |
568 | bool acpi_has_method(acpi_handle handle, char *name) | |
569 | { | |
570 | acpi_handle tmp; | |
571 | ||
572 | return ACPI_SUCCESS(acpi_get_handle(handle, name, &tmp)); | |
573 | } | |
574 | EXPORT_SYMBOL(acpi_has_method); | |
0db98202 JL |
575 | |
576 | acpi_status acpi_execute_simple_method(acpi_handle handle, char *method, | |
577 | u64 arg) | |
578 | { | |
579 | union acpi_object obj = { .type = ACPI_TYPE_INTEGER }; | |
580 | struct acpi_object_list arg_list = { .count = 1, .pointer = &obj, }; | |
581 | ||
582 | obj.integer.value = arg; | |
583 | ||
584 | return acpi_evaluate_object(handle, method, &arg_list, NULL); | |
585 | } | |
586 | EXPORT_SYMBOL(acpi_execute_simple_method); | |
7d2421f8 JL |
587 | |
588 | /** | |
589 | * acpi_evaluate_ej0: Evaluate _EJ0 method for hotplug operations | |
590 | * @handle: ACPI device handle | |
591 | * | |
592 | * Evaluate device's _EJ0 method for hotplug operations. | |
593 | */ | |
594 | acpi_status acpi_evaluate_ej0(acpi_handle handle) | |
595 | { | |
596 | acpi_status status; | |
597 | ||
598 | status = acpi_execute_simple_method(handle, "_EJ0", 1); | |
599 | if (status == AE_NOT_FOUND) | |
600 | acpi_handle_warn(handle, "No _EJ0 support for device\n"); | |
601 | else if (ACPI_FAILURE(status)) | |
602 | acpi_handle_warn(handle, "Eject failed (0x%x)\n", status); | |
603 | ||
604 | return status; | |
605 | } | |
606 | ||
607 | /** | |
608 | * acpi_evaluate_lck: Evaluate _LCK method to lock/unlock device | |
609 | * @handle: ACPI device handle | |
610 | * @lock: lock device if non-zero, otherwise unlock device | |
611 | * | |
612 | * Evaluate device's _LCK method if present to lock/unlock device | |
613 | */ | |
614 | acpi_status acpi_evaluate_lck(acpi_handle handle, int lock) | |
615 | { | |
616 | acpi_status status; | |
617 | ||
618 | status = acpi_execute_simple_method(handle, "_LCK", !!lock); | |
619 | if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) { | |
620 | if (lock) | |
621 | acpi_handle_warn(handle, | |
622 | "Locking device failed (0x%x)\n", status); | |
623 | else | |
624 | acpi_handle_warn(handle, | |
625 | "Unlocking device failed (0x%x)\n", status); | |
626 | } | |
627 | ||
628 | return status; | |
629 | } | |
a65ac520 JL |
630 | |
631 | /** | |
632 | * acpi_evaluate_dsm - evaluate device's _DSM method | |
633 | * @handle: ACPI device handle | |
634 | * @uuid: UUID of requested functions, should be 16 bytes | |
635 | * @rev: revision number of requested function | |
636 | * @func: requested function number | |
637 | * @argv4: the function specific parameter | |
638 | * | |
639 | * Evaluate device's _DSM method with specified UUID, revision id and | |
640 | * function number. Caller needs to free the returned object. | |
641 | * | |
642 | * Though ACPI defines the fourth parameter for _DSM should be a package, | |
643 | * some old BIOSes do expect a buffer or an integer etc. | |
644 | */ | |
645 | union acpi_object * | |
646 | acpi_evaluate_dsm(acpi_handle handle, const u8 *uuid, int rev, int func, | |
647 | union acpi_object *argv4) | |
648 | { | |
649 | acpi_status ret; | |
650 | struct acpi_buffer buf = {ACPI_ALLOCATE_BUFFER, NULL}; | |
651 | union acpi_object params[4]; | |
652 | struct acpi_object_list input = { | |
653 | .count = 4, | |
654 | .pointer = params, | |
655 | }; | |
656 | ||
657 | params[0].type = ACPI_TYPE_BUFFER; | |
658 | params[0].buffer.length = 16; | |
659 | params[0].buffer.pointer = (char *)uuid; | |
660 | params[1].type = ACPI_TYPE_INTEGER; | |
661 | params[1].integer.value = rev; | |
662 | params[2].type = ACPI_TYPE_INTEGER; | |
663 | params[2].integer.value = func; | |
664 | if (argv4) { | |
665 | params[3] = *argv4; | |
666 | } else { | |
667 | params[3].type = ACPI_TYPE_PACKAGE; | |
668 | params[3].package.count = 0; | |
669 | params[3].package.elements = NULL; | |
670 | } | |
671 | ||
672 | ret = acpi_evaluate_object(handle, "_DSM", &input, &buf); | |
673 | if (ACPI_SUCCESS(ret)) | |
674 | return (union acpi_object *)buf.pointer; | |
675 | ||
676 | if (ret != AE_NOT_FOUND) | |
677 | acpi_handle_warn(handle, | |
678 | "failed to evaluate _DSM (0x%x)\n", ret); | |
679 | ||
680 | return NULL; | |
681 | } | |
682 | EXPORT_SYMBOL(acpi_evaluate_dsm); | |
683 | ||
684 | /** | |
685 | * acpi_check_dsm - check if _DSM method supports requested functions. | |
686 | * @handle: ACPI device handle | |
687 | * @uuid: UUID of requested functions, should be 16 bytes at least | |
688 | * @rev: revision number of requested functions | |
689 | * @funcs: bitmap of requested functions | |
a65ac520 JL |
690 | * |
691 | * Evaluate device's _DSM method to check whether it supports requested | |
692 | * functions. Currently only support 64 functions at maximum, should be | |
693 | * enough for now. | |
694 | */ | |
695 | bool acpi_check_dsm(acpi_handle handle, const u8 *uuid, int rev, u64 funcs) | |
696 | { | |
697 | int i; | |
698 | u64 mask = 0; | |
699 | union acpi_object *obj; | |
700 | ||
701 | if (funcs == 0) | |
702 | return false; | |
703 | ||
704 | obj = acpi_evaluate_dsm(handle, uuid, rev, 0, NULL); | |
705 | if (!obj) | |
706 | return false; | |
707 | ||
708 | /* For compatibility, old BIOSes may return an integer */ | |
709 | if (obj->type == ACPI_TYPE_INTEGER) | |
710 | mask = obj->integer.value; | |
711 | else if (obj->type == ACPI_TYPE_BUFFER) | |
712 | for (i = 0; i < obj->buffer.length && i < 8; i++) | |
713 | mask |= (((u8)obj->buffer.pointer[i]) << (i * 8)); | |
714 | ACPI_FREE(obj); | |
715 | ||
716 | /* | |
717 | * Bit 0 indicates whether there's support for any functions other than | |
718 | * function 0 for the specified UUID and revision. | |
719 | */ | |
720 | if ((mask & 0x1) && (mask & funcs) == funcs) | |
721 | return true; | |
722 | ||
723 | return false; | |
724 | } | |
725 | EXPORT_SYMBOL(acpi_check_dsm); |