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