Commit | Line | Data |
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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> | |
1da177e4 | 33 | |
a192a958 LB |
34 | #include "internal.h" |
35 | ||
1da177e4 | 36 | #define _COMPONENT ACPI_BUS_COMPONENT |
f52fd66d | 37 | ACPI_MODULE_NAME("utils"); |
1da177e4 LT |
38 | |
39 | /* -------------------------------------------------------------------------- | |
40 | Object Evaluation Helpers | |
41 | -------------------------------------------------------------------------- */ | |
4fd7f518 HH |
42 | static void |
43 | acpi_util_eval_error(acpi_handle h, acpi_string p, acpi_status s) | |
44 | { | |
1da177e4 | 45 | #ifdef ACPI_DEBUG_OUTPUT |
4fd7f518 HH |
46 | char prefix[80] = {'\0'}; |
47 | struct acpi_buffer buffer = {sizeof(prefix), prefix}; | |
48 | acpi_get_name(h, ACPI_FULL_PATHNAME, &buffer); | |
49 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Evaluate [%s.%s]: %s\n", | |
50 | (char *) prefix, p, acpi_format_exception(s))); | |
1da177e4 | 51 | #else |
4fd7f518 | 52 | return; |
1da177e4 | 53 | #endif |
4fd7f518 HH |
54 | } |
55 | ||
1da177e4 | 56 | acpi_status |
4be44fcd LB |
57 | acpi_extract_package(union acpi_object *package, |
58 | struct acpi_buffer *format, struct acpi_buffer *buffer) | |
1da177e4 | 59 | { |
4be44fcd LB |
60 | u32 size_required = 0; |
61 | u32 tail_offset = 0; | |
62 | char *format_string = NULL; | |
63 | u32 format_count = 0; | |
64 | u32 i = 0; | |
65 | u8 *head = NULL; | |
66 | u8 *tail = NULL; | |
1da177e4 | 67 | |
1da177e4 | 68 | |
4be44fcd LB |
69 | if (!package || (package->type != ACPI_TYPE_PACKAGE) |
70 | || (package->package.count < 1)) { | |
cece9296 | 71 | printk(KERN_WARNING PREFIX "Invalid package argument\n"); |
d550d98d | 72 | return AE_BAD_PARAMETER; |
1da177e4 LT |
73 | } |
74 | ||
75 | if (!format || !format->pointer || (format->length < 1)) { | |
cece9296 | 76 | printk(KERN_WARNING PREFIX "Invalid format argument\n"); |
d550d98d | 77 | return AE_BAD_PARAMETER; |
1da177e4 LT |
78 | } |
79 | ||
80 | if (!buffer) { | |
cece9296 | 81 | printk(KERN_WARNING PREFIX "Invalid buffer argument\n"); |
d550d98d | 82 | return AE_BAD_PARAMETER; |
1da177e4 LT |
83 | } |
84 | ||
4be44fcd | 85 | format_count = (format->length / sizeof(char)) - 1; |
1da177e4 | 86 | if (format_count > package->package.count) { |
cece9296 LB |
87 | printk(KERN_WARNING PREFIX "Format specifies more objects [%d]" |
88 | " than exist in package [%d].\n", | |
89 | format_count, package->package.count); | |
d550d98d | 90 | return AE_BAD_DATA; |
1da177e4 LT |
91 | } |
92 | ||
50dd0969 | 93 | format_string = format->pointer; |
1da177e4 LT |
94 | |
95 | /* | |
96 | * Calculate size_required. | |
97 | */ | |
4be44fcd | 98 | for (i = 0; i < format_count; i++) { |
1da177e4 LT |
99 | |
100 | union acpi_object *element = &(package->package.elements[i]); | |
101 | ||
1da177e4 LT |
102 | switch (element->type) { |
103 | ||
104 | case ACPI_TYPE_INTEGER: | |
105 | switch (format_string[i]) { | |
106 | case 'N': | |
439913ff LM |
107 | size_required += sizeof(u64); |
108 | tail_offset += sizeof(u64); | |
1da177e4 LT |
109 | break; |
110 | case 'S': | |
4be44fcd | 111 | size_required += |
439913ff | 112 | sizeof(char *) + sizeof(u64) + |
4be44fcd LB |
113 | sizeof(char); |
114 | tail_offset += sizeof(char *); | |
1da177e4 LT |
115 | break; |
116 | default: | |
cece9296 | 117 | printk(KERN_WARNING PREFIX "Invalid package element" |
e7e92ec9 | 118 | " [%d]: got number, expecting" |
cece9296 LB |
119 | " [%c]\n", |
120 | i, format_string[i]); | |
d550d98d | 121 | return AE_BAD_DATA; |
1da177e4 LT |
122 | break; |
123 | } | |
124 | break; | |
125 | ||
126 | case ACPI_TYPE_STRING: | |
127 | case ACPI_TYPE_BUFFER: | |
128 | switch (format_string[i]) { | |
129 | case 'S': | |
4be44fcd LB |
130 | size_required += |
131 | sizeof(char *) + | |
132 | (element->string.length * sizeof(char)) + | |
133 | sizeof(char); | |
134 | tail_offset += sizeof(char *); | |
1da177e4 LT |
135 | break; |
136 | case 'B': | |
4be44fcd LB |
137 | size_required += |
138 | sizeof(u8 *) + | |
139 | (element->buffer.length * sizeof(u8)); | |
140 | tail_offset += sizeof(u8 *); | |
1da177e4 LT |
141 | break; |
142 | default: | |
cece9296 | 143 | printk(KERN_WARNING PREFIX "Invalid package element" |
a6fc6720 | 144 | " [%d] got string/buffer," |
e7e92ec9 | 145 | " expecting [%c]\n", |
cece9296 | 146 | i, format_string[i]); |
d550d98d | 147 | return AE_BAD_DATA; |
1da177e4 LT |
148 | break; |
149 | } | |
150 | break; | |
151 | ||
152 | case ACPI_TYPE_PACKAGE: | |
153 | default: | |
4be44fcd LB |
154 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
155 | "Found unsupported element at index=%d\n", | |
156 | i)); | |
1da177e4 | 157 | /* TBD: handle nested packages... */ |
d550d98d | 158 | return AE_SUPPORT; |
1da177e4 LT |
159 | break; |
160 | } | |
161 | } | |
162 | ||
163 | /* | |
164 | * Validate output buffer. | |
165 | */ | |
e83dda06 | 166 | if (buffer->length == ACPI_ALLOCATE_BUFFER) { |
2d0acb4a | 167 | buffer->pointer = ACPI_ALLOCATE_ZEROED(size_required); |
e83dda06 AS |
168 | if (!buffer->pointer) |
169 | return AE_NO_MEMORY; | |
1da177e4 | 170 | buffer->length = size_required; |
e83dda06 AS |
171 | } else { |
172 | if (buffer->length < size_required) { | |
173 | buffer->length = size_required; | |
174 | return AE_BUFFER_OVERFLOW; | |
175 | } else if (buffer->length != size_required || | |
176 | !buffer->pointer) { | |
177 | return AE_BAD_PARAMETER; | |
178 | } | |
1da177e4 LT |
179 | } |
180 | ||
181 | head = buffer->pointer; | |
182 | tail = buffer->pointer + tail_offset; | |
183 | ||
184 | /* | |
185 | * Extract package data. | |
186 | */ | |
4be44fcd | 187 | for (i = 0; i < format_count; i++) { |
1da177e4 LT |
188 | |
189 | u8 **pointer = NULL; | |
190 | union acpi_object *element = &(package->package.elements[i]); | |
191 | ||
192 | if (!element) { | |
d550d98d | 193 | return AE_BAD_DATA; |
1da177e4 LT |
194 | } |
195 | ||
196 | switch (element->type) { | |
197 | ||
198 | case ACPI_TYPE_INTEGER: | |
199 | switch (format_string[i]) { | |
200 | case 'N': | |
439913ff | 201 | *((u64 *) head) = |
4be44fcd | 202 | element->integer.value; |
439913ff | 203 | head += sizeof(u64); |
1da177e4 LT |
204 | break; |
205 | case 'S': | |
4be44fcd | 206 | pointer = (u8 **) head; |
1da177e4 | 207 | *pointer = tail; |
439913ff | 208 | *((u64 *) tail) = |
4be44fcd | 209 | element->integer.value; |
439913ff LM |
210 | head += sizeof(u64 *); |
211 | tail += sizeof(u64); | |
1da177e4 LT |
212 | /* NULL terminate string */ |
213 | *tail = (char)0; | |
214 | tail += sizeof(char); | |
215 | break; | |
216 | default: | |
217 | /* Should never get here */ | |
218 | break; | |
219 | } | |
220 | break; | |
221 | ||
222 | case ACPI_TYPE_STRING: | |
223 | case ACPI_TYPE_BUFFER: | |
224 | switch (format_string[i]) { | |
225 | case 'S': | |
4be44fcd | 226 | pointer = (u8 **) head; |
1da177e4 | 227 | *pointer = tail; |
4be44fcd LB |
228 | memcpy(tail, element->string.pointer, |
229 | element->string.length); | |
230 | head += sizeof(char *); | |
1da177e4 LT |
231 | tail += element->string.length * sizeof(char); |
232 | /* NULL terminate string */ | |
233 | *tail = (char)0; | |
234 | tail += sizeof(char); | |
235 | break; | |
236 | case 'B': | |
4be44fcd | 237 | pointer = (u8 **) head; |
1da177e4 | 238 | *pointer = tail; |
4be44fcd LB |
239 | memcpy(tail, element->buffer.pointer, |
240 | element->buffer.length); | |
241 | head += sizeof(u8 *); | |
1da177e4 LT |
242 | tail += element->buffer.length * sizeof(u8); |
243 | break; | |
244 | default: | |
245 | /* Should never get here */ | |
246 | break; | |
247 | } | |
248 | break; | |
249 | ||
250 | case ACPI_TYPE_PACKAGE: | |
251 | /* TBD: handle nested packages... */ | |
252 | default: | |
253 | /* Should never get here */ | |
254 | break; | |
255 | } | |
256 | } | |
257 | ||
d550d98d | 258 | return AE_OK; |
1da177e4 | 259 | } |
1da177e4 | 260 | |
4be44fcd | 261 | EXPORT_SYMBOL(acpi_extract_package); |
1da177e4 LT |
262 | |
263 | acpi_status | |
4be44fcd LB |
264 | acpi_evaluate_integer(acpi_handle handle, |
265 | acpi_string pathname, | |
27663c58 | 266 | struct acpi_object_list *arguments, unsigned long long *data) |
1da177e4 | 267 | { |
4be44fcd | 268 | acpi_status status = AE_OK; |
40599072 | 269 | union acpi_object element; |
4be44fcd | 270 | struct acpi_buffer buffer = { 0, NULL }; |
1da177e4 | 271 | |
1da177e4 | 272 | if (!data) |
d550d98d | 273 | return AE_BAD_PARAMETER; |
1da177e4 | 274 | |
1da177e4 | 275 | buffer.length = sizeof(union acpi_object); |
40599072 | 276 | buffer.pointer = &element; |
1da177e4 LT |
277 | status = acpi_evaluate_object(handle, pathname, arguments, &buffer); |
278 | if (ACPI_FAILURE(status)) { | |
279 | acpi_util_eval_error(handle, pathname, status); | |
d550d98d | 280 | return status; |
1da177e4 LT |
281 | } |
282 | ||
40599072 | 283 | if (element.type != ACPI_TYPE_INTEGER) { |
1da177e4 | 284 | acpi_util_eval_error(handle, pathname, AE_BAD_DATA); |
d550d98d | 285 | return AE_BAD_DATA; |
1da177e4 LT |
286 | } |
287 | ||
40599072 | 288 | *data = element.integer.value; |
1da177e4 | 289 | |
27663c58 | 290 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Return value [%llu]\n", *data)); |
1da177e4 | 291 | |
d550d98d | 292 | return AE_OK; |
1da177e4 | 293 | } |
1da177e4 | 294 | |
4be44fcd | 295 | EXPORT_SYMBOL(acpi_evaluate_integer); |
1da177e4 | 296 | |
1da177e4 | 297 | acpi_status |
4be44fcd LB |
298 | acpi_evaluate_reference(acpi_handle handle, |
299 | acpi_string pathname, | |
300 | struct acpi_object_list *arguments, | |
301 | struct acpi_handle_list *list) | |
1da177e4 | 302 | { |
4be44fcd LB |
303 | acpi_status status = AE_OK; |
304 | union acpi_object *package = NULL; | |
305 | union acpi_object *element = NULL; | |
306 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
307 | u32 i = 0; | |
1da177e4 | 308 | |
1da177e4 LT |
309 | |
310 | if (!list) { | |
d550d98d | 311 | return AE_BAD_PARAMETER; |
1da177e4 LT |
312 | } |
313 | ||
314 | /* Evaluate object. */ | |
315 | ||
316 | status = acpi_evaluate_object(handle, pathname, arguments, &buffer); | |
317 | if (ACPI_FAILURE(status)) | |
318 | goto end; | |
319 | ||
50dd0969 | 320 | package = buffer.pointer; |
1da177e4 LT |
321 | |
322 | if ((buffer.length == 0) || !package) { | |
6468463a LB |
323 | printk(KERN_ERR PREFIX "No return object (len %X ptr %p)\n", |
324 | (unsigned)buffer.length, package); | |
1da177e4 LT |
325 | status = AE_BAD_DATA; |
326 | acpi_util_eval_error(handle, pathname, status); | |
327 | goto end; | |
328 | } | |
329 | if (package->type != ACPI_TYPE_PACKAGE) { | |
6468463a LB |
330 | printk(KERN_ERR PREFIX "Expecting a [Package], found type %X\n", |
331 | package->type); | |
1da177e4 LT |
332 | status = AE_BAD_DATA; |
333 | acpi_util_eval_error(handle, pathname, status); | |
334 | goto end; | |
335 | } | |
336 | if (!package->package.count) { | |
6468463a LB |
337 | printk(KERN_ERR PREFIX "[Package] has zero elements (%p)\n", |
338 | package); | |
1da177e4 LT |
339 | status = AE_BAD_DATA; |
340 | acpi_util_eval_error(handle, pathname, status); | |
341 | goto end; | |
342 | } | |
343 | ||
344 | if (package->package.count > ACPI_MAX_HANDLES) { | |
d550d98d | 345 | return AE_NO_MEMORY; |
1da177e4 LT |
346 | } |
347 | list->count = package->package.count; | |
348 | ||
349 | /* Extract package data. */ | |
350 | ||
351 | for (i = 0; i < list->count; i++) { | |
352 | ||
353 | element = &(package->package.elements[i]); | |
354 | ||
cd0b2248 | 355 | if (element->type != ACPI_TYPE_LOCAL_REFERENCE) { |
1da177e4 | 356 | status = AE_BAD_DATA; |
6468463a LB |
357 | printk(KERN_ERR PREFIX |
358 | "Expecting a [Reference] package element, found type %X\n", | |
359 | element->type); | |
1da177e4 LT |
360 | acpi_util_eval_error(handle, pathname, status); |
361 | break; | |
362 | } | |
363 | ||
b6a16387 TR |
364 | if (!element->reference.handle) { |
365 | printk(KERN_WARNING PREFIX "Invalid reference in" | |
366 | " package %s\n", pathname); | |
367 | status = AE_NULL_ENTRY; | |
368 | break; | |
369 | } | |
1da177e4 LT |
370 | /* Get the acpi_handle. */ |
371 | ||
372 | list->handles[i] = element->reference.handle; | |
373 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found reference [%p]\n", | |
4be44fcd | 374 | list->handles[i])); |
1da177e4 LT |
375 | } |
376 | ||
4be44fcd | 377 | end: |
1da177e4 LT |
378 | if (ACPI_FAILURE(status)) { |
379 | list->count = 0; | |
380 | //kfree(list->handles); | |
381 | } | |
382 | ||
02438d87 | 383 | kfree(buffer.pointer); |
1da177e4 | 384 | |
d550d98d | 385 | return status; |
1da177e4 | 386 | } |
1da177e4 | 387 | |
4be44fcd | 388 | EXPORT_SYMBOL(acpi_evaluate_reference); |
38ac0f1b MG |
389 | |
390 | acpi_status | |
8ede06ab | 391 | acpi_get_physical_device_location(acpi_handle handle, struct acpi_pld_info **pld) |
38ac0f1b MG |
392 | { |
393 | acpi_status status; | |
394 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
395 | union acpi_object *output; | |
396 | ||
397 | status = acpi_evaluate_object(handle, "_PLD", NULL, &buffer); | |
398 | ||
399 | if (ACPI_FAILURE(status)) | |
400 | return status; | |
401 | ||
402 | output = buffer.pointer; | |
403 | ||
404 | if (!output || output->type != ACPI_TYPE_PACKAGE | |
405 | || !output->package.count | |
406 | || output->package.elements[0].type != ACPI_TYPE_BUFFER | |
8ede06ab | 407 | || output->package.elements[0].buffer.length < ACPI_PLD_REV1_BUFFER_SIZE) { |
38ac0f1b MG |
408 | status = AE_TYPE; |
409 | goto out; | |
410 | } | |
411 | ||
8ede06ab FT |
412 | status = acpi_decode_pld_buffer( |
413 | output->package.elements[0].buffer.pointer, | |
414 | output->package.elements[0].buffer.length, | |
415 | pld); | |
416 | ||
38ac0f1b MG |
417 | out: |
418 | kfree(buffer.pointer); | |
419 | return status; | |
420 | } | |
421 | EXPORT_SYMBOL(acpi_get_physical_device_location); | |
275c58d7 TK |
422 | |
423 | /** | |
700b8422 | 424 | * acpi_evaluate_ost: Evaluate _OST for hotplug operations |
275c58d7 TK |
425 | * @handle: ACPI device handle |
426 | * @source_event: source event code | |
427 | * @status_code: status code | |
428 | * @status_buf: optional detailed information (NULL if none) | |
429 | * | |
430 | * Evaluate _OST for hotplug operations. All ACPI hotplug handlers | |
431 | * must call this function when evaluating _OST for hotplug operations. | |
432 | * When the platform does not support _OST, this function has no effect. | |
433 | */ | |
434 | acpi_status | |
05730c19 JL |
435 | acpi_evaluate_ost(acpi_handle handle, u32 source_event, u32 status_code, |
436 | struct acpi_buffer *status_buf) | |
275c58d7 | 437 | { |
275c58d7 TK |
438 | union acpi_object params[3] = { |
439 | {.type = ACPI_TYPE_INTEGER,}, | |
440 | {.type = ACPI_TYPE_INTEGER,}, | |
441 | {.type = ACPI_TYPE_BUFFER,} | |
442 | }; | |
443 | struct acpi_object_list arg_list = {3, params}; | |
275c58d7 TK |
444 | |
445 | params[0].integer.value = source_event; | |
446 | params[1].integer.value = status_code; | |
447 | if (status_buf != NULL) { | |
448 | params[2].buffer.pointer = status_buf->pointer; | |
449 | params[2].buffer.length = status_buf->length; | |
450 | } else { | |
451 | params[2].buffer.pointer = NULL; | |
452 | params[2].buffer.length = 0; | |
453 | } | |
454 | ||
05730c19 | 455 | return acpi_evaluate_object(handle, "_OST", &arg_list, NULL); |
275c58d7 | 456 | } |
05730c19 | 457 | EXPORT_SYMBOL(acpi_evaluate_ost); |
fbfddae6 TK |
458 | |
459 | /** | |
460 | * acpi_handle_printk: Print message with ACPI prefix and object path | |
461 | * | |
462 | * This function is called through acpi_handle_<level> macros and prints | |
463 | * a message with ACPI prefix and object path. This function acquires | |
464 | * the global namespace mutex to obtain an object path. In interrupt | |
465 | * context, it shows the object path as <n/a>. | |
466 | */ | |
467 | void | |
468 | acpi_handle_printk(const char *level, acpi_handle handle, const char *fmt, ...) | |
469 | { | |
470 | struct va_format vaf; | |
471 | va_list args; | |
472 | struct acpi_buffer buffer = { | |
473 | .length = ACPI_ALLOCATE_BUFFER, | |
474 | .pointer = NULL | |
475 | }; | |
476 | const char *path; | |
477 | ||
478 | va_start(args, fmt); | |
479 | vaf.fmt = fmt; | |
480 | vaf.va = &args; | |
481 | ||
482 | if (in_interrupt() || | |
483 | acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer) != AE_OK) | |
484 | path = "<n/a>"; | |
485 | else | |
486 | path = buffer.pointer; | |
487 | ||
488 | printk("%sACPI: %s: %pV", level, path, &vaf); | |
489 | ||
490 | va_end(args); | |
491 | kfree(buffer.pointer); | |
492 | } | |
493 | EXPORT_SYMBOL(acpi_handle_printk); | |
952c63e9 JL |
494 | |
495 | /** | |
496 | * acpi_has_method: Check whether @handle has a method named @name | |
497 | * @handle: ACPI device handle | |
498 | * @name: name of object or method | |
499 | * | |
500 | * Check whether @handle has a method named @name. | |
501 | */ | |
502 | bool acpi_has_method(acpi_handle handle, char *name) | |
503 | { | |
504 | acpi_handle tmp; | |
505 | ||
506 | return ACPI_SUCCESS(acpi_get_handle(handle, name, &tmp)); | |
507 | } | |
508 | EXPORT_SYMBOL(acpi_has_method); | |
0db98202 JL |
509 | |
510 | acpi_status acpi_execute_simple_method(acpi_handle handle, char *method, | |
511 | u64 arg) | |
512 | { | |
513 | union acpi_object obj = { .type = ACPI_TYPE_INTEGER }; | |
514 | struct acpi_object_list arg_list = { .count = 1, .pointer = &obj, }; | |
515 | ||
516 | obj.integer.value = arg; | |
517 | ||
518 | return acpi_evaluate_object(handle, method, &arg_list, NULL); | |
519 | } | |
520 | EXPORT_SYMBOL(acpi_execute_simple_method); | |
7d2421f8 JL |
521 | |
522 | /** | |
523 | * acpi_evaluate_ej0: Evaluate _EJ0 method for hotplug operations | |
524 | * @handle: ACPI device handle | |
525 | * | |
526 | * Evaluate device's _EJ0 method for hotplug operations. | |
527 | */ | |
528 | acpi_status acpi_evaluate_ej0(acpi_handle handle) | |
529 | { | |
530 | acpi_status status; | |
531 | ||
532 | status = acpi_execute_simple_method(handle, "_EJ0", 1); | |
533 | if (status == AE_NOT_FOUND) | |
534 | acpi_handle_warn(handle, "No _EJ0 support for device\n"); | |
535 | else if (ACPI_FAILURE(status)) | |
536 | acpi_handle_warn(handle, "Eject failed (0x%x)\n", status); | |
537 | ||
538 | return status; | |
539 | } | |
540 | ||
541 | /** | |
542 | * acpi_evaluate_lck: Evaluate _LCK method to lock/unlock device | |
543 | * @handle: ACPI device handle | |
544 | * @lock: lock device if non-zero, otherwise unlock device | |
545 | * | |
546 | * Evaluate device's _LCK method if present to lock/unlock device | |
547 | */ | |
548 | acpi_status acpi_evaluate_lck(acpi_handle handle, int lock) | |
549 | { | |
550 | acpi_status status; | |
551 | ||
552 | status = acpi_execute_simple_method(handle, "_LCK", !!lock); | |
553 | if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) { | |
554 | if (lock) | |
555 | acpi_handle_warn(handle, | |
556 | "Locking device failed (0x%x)\n", status); | |
557 | else | |
558 | acpi_handle_warn(handle, | |
559 | "Unlocking device failed (0x%x)\n", status); | |
560 | } | |
561 | ||
562 | return status; | |
563 | } | |
a65ac520 JL |
564 | |
565 | /** | |
566 | * acpi_evaluate_dsm - evaluate device's _DSM method | |
567 | * @handle: ACPI device handle | |
568 | * @uuid: UUID of requested functions, should be 16 bytes | |
569 | * @rev: revision number of requested function | |
570 | * @func: requested function number | |
571 | * @argv4: the function specific parameter | |
572 | * | |
573 | * Evaluate device's _DSM method with specified UUID, revision id and | |
574 | * function number. Caller needs to free the returned object. | |
575 | * | |
576 | * Though ACPI defines the fourth parameter for _DSM should be a package, | |
577 | * some old BIOSes do expect a buffer or an integer etc. | |
578 | */ | |
579 | union acpi_object * | |
580 | acpi_evaluate_dsm(acpi_handle handle, const u8 *uuid, int rev, int func, | |
581 | union acpi_object *argv4) | |
582 | { | |
583 | acpi_status ret; | |
584 | struct acpi_buffer buf = {ACPI_ALLOCATE_BUFFER, NULL}; | |
585 | union acpi_object params[4]; | |
586 | struct acpi_object_list input = { | |
587 | .count = 4, | |
588 | .pointer = params, | |
589 | }; | |
590 | ||
591 | params[0].type = ACPI_TYPE_BUFFER; | |
592 | params[0].buffer.length = 16; | |
593 | params[0].buffer.pointer = (char *)uuid; | |
594 | params[1].type = ACPI_TYPE_INTEGER; | |
595 | params[1].integer.value = rev; | |
596 | params[2].type = ACPI_TYPE_INTEGER; | |
597 | params[2].integer.value = func; | |
598 | if (argv4) { | |
599 | params[3] = *argv4; | |
600 | } else { | |
601 | params[3].type = ACPI_TYPE_PACKAGE; | |
602 | params[3].package.count = 0; | |
603 | params[3].package.elements = NULL; | |
604 | } | |
605 | ||
606 | ret = acpi_evaluate_object(handle, "_DSM", &input, &buf); | |
607 | if (ACPI_SUCCESS(ret)) | |
608 | return (union acpi_object *)buf.pointer; | |
609 | ||
610 | if (ret != AE_NOT_FOUND) | |
611 | acpi_handle_warn(handle, | |
612 | "failed to evaluate _DSM (0x%x)\n", ret); | |
613 | ||
614 | return NULL; | |
615 | } | |
616 | EXPORT_SYMBOL(acpi_evaluate_dsm); | |
617 | ||
618 | /** | |
619 | * acpi_check_dsm - check if _DSM method supports requested functions. | |
620 | * @handle: ACPI device handle | |
621 | * @uuid: UUID of requested functions, should be 16 bytes at least | |
622 | * @rev: revision number of requested functions | |
623 | * @funcs: bitmap of requested functions | |
624 | * @exclude: excluding special value, used to support i915 and nouveau | |
625 | * | |
626 | * Evaluate device's _DSM method to check whether it supports requested | |
627 | * functions. Currently only support 64 functions at maximum, should be | |
628 | * enough for now. | |
629 | */ | |
630 | bool acpi_check_dsm(acpi_handle handle, const u8 *uuid, int rev, u64 funcs) | |
631 | { | |
632 | int i; | |
633 | u64 mask = 0; | |
634 | union acpi_object *obj; | |
635 | ||
636 | if (funcs == 0) | |
637 | return false; | |
638 | ||
639 | obj = acpi_evaluate_dsm(handle, uuid, rev, 0, NULL); | |
640 | if (!obj) | |
641 | return false; | |
642 | ||
643 | /* For compatibility, old BIOSes may return an integer */ | |
644 | if (obj->type == ACPI_TYPE_INTEGER) | |
645 | mask = obj->integer.value; | |
646 | else if (obj->type == ACPI_TYPE_BUFFER) | |
647 | for (i = 0; i < obj->buffer.length && i < 8; i++) | |
648 | mask |= (((u8)obj->buffer.pointer[i]) << (i * 8)); | |
649 | ACPI_FREE(obj); | |
650 | ||
651 | /* | |
652 | * Bit 0 indicates whether there's support for any functions other than | |
653 | * function 0 for the specified UUID and revision. | |
654 | */ | |
655 | if ((mask & 0x1) && (mask & funcs) == funcs) | |
656 | return true; | |
657 | ||
658 | return false; | |
659 | } | |
660 | EXPORT_SYMBOL(acpi_check_dsm); |