blob: 6d408bfbbb1d0c66dbef28d02137dbda0777d9f4 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090028#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070029#include <linux/init.h>
30#include <linux/types.h>
Toshi Kanifbfddae2012-11-21 01:36:28 +000031#include <linux/hardirq.h>
32#include <linux/acpi.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070033#include <acpi/acpi_bus.h>
34#include <acpi/acpi_drivers.h>
35
Len Browna192a952009-07-28 16:45:54 -040036#include "internal.h"
37
Linus Torvalds1da177e2005-04-16 15:20:36 -070038#define _COMPONENT ACPI_BUS_COMPONENT
Len Brownf52fd662007-02-12 22:42:12 -050039ACPI_MODULE_NAME("utils");
Linus Torvalds1da177e2005-04-16 15:20:36 -070040
41/* --------------------------------------------------------------------------
42 Object Evaluation Helpers
43 -------------------------------------------------------------------------- */
Harvey Harrison4fd7f512008-02-15 17:07:19 -080044static void
45acpi_util_eval_error(acpi_handle h, acpi_string p, acpi_status s)
46{
Linus Torvalds1da177e2005-04-16 15:20:36 -070047#ifdef ACPI_DEBUG_OUTPUT
Harvey Harrison4fd7f512008-02-15 17:07:19 -080048 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)));
Linus Torvalds1da177e2005-04-16 15:20:36 -070053#else
Harvey Harrison4fd7f512008-02-15 17:07:19 -080054 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -070055#endif
Harvey Harrison4fd7f512008-02-15 17:07:19 -080056}
57
Linus Torvalds1da177e2005-04-16 15:20:36 -070058acpi_status
Len Brown4be44fc2005-08-05 00:44:28 -040059acpi_extract_package(union acpi_object *package,
60 struct acpi_buffer *format, struct acpi_buffer *buffer)
Linus Torvalds1da177e2005-04-16 15:20:36 -070061{
Len Brown4be44fc2005-08-05 00:44:28 -040062 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;
Linus Torvalds1da177e2005-04-16 15:20:36 -070069
Linus Torvalds1da177e2005-04-16 15:20:36 -070070
Len Brown4be44fc2005-08-05 00:44:28 -040071 if (!package || (package->type != ACPI_TYPE_PACKAGE)
72 || (package->package.count < 1)) {
Len Browncece9292006-06-26 23:04:31 -040073 printk(KERN_WARNING PREFIX "Invalid package argument\n");
Patrick Mocheld550d982006-06-27 00:41:40 -040074 return AE_BAD_PARAMETER;
Linus Torvalds1da177e2005-04-16 15:20:36 -070075 }
76
77 if (!format || !format->pointer || (format->length < 1)) {
Len Browncece9292006-06-26 23:04:31 -040078 printk(KERN_WARNING PREFIX "Invalid format argument\n");
Patrick Mocheld550d982006-06-27 00:41:40 -040079 return AE_BAD_PARAMETER;
Linus Torvalds1da177e2005-04-16 15:20:36 -070080 }
81
82 if (!buffer) {
Len Browncece9292006-06-26 23:04:31 -040083 printk(KERN_WARNING PREFIX "Invalid buffer argument\n");
Patrick Mocheld550d982006-06-27 00:41:40 -040084 return AE_BAD_PARAMETER;
Linus Torvalds1da177e2005-04-16 15:20:36 -070085 }
86
Len Brown4be44fc2005-08-05 00:44:28 -040087 format_count = (format->length / sizeof(char)) - 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -070088 if (format_count > package->package.count) {
Len Browncece9292006-06-26 23:04:31 -040089 printk(KERN_WARNING PREFIX "Format specifies more objects [%d]"
90 " than exist in package [%d].\n",
91 format_count, package->package.count);
Patrick Mocheld550d982006-06-27 00:41:40 -040092 return AE_BAD_DATA;
Linus Torvalds1da177e2005-04-16 15:20:36 -070093 }
94
Jan Engelhardt50dd0962006-10-01 00:28:50 +020095 format_string = format->pointer;
Linus Torvalds1da177e2005-04-16 15:20:36 -070096
97 /*
98 * Calculate size_required.
99 */
Len Brown4be44fc2005-08-05 00:44:28 -0400100 for (i = 0; i < format_count; i++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101
102 union acpi_object *element = &(package->package.elements[i]);
103
104 if (!element) {
Patrick Mocheld550d982006-06-27 00:41:40 -0400105 return AE_BAD_DATA;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106 }
107
108 switch (element->type) {
109
110 case ACPI_TYPE_INTEGER:
111 switch (format_string[i]) {
112 case 'N':
Lin Ming439913f2010-01-28 10:53:19 +0800113 size_required += sizeof(u64);
114 tail_offset += sizeof(u64);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115 break;
116 case 'S':
Len Brown4be44fc2005-08-05 00:44:28 -0400117 size_required +=
Lin Ming439913f2010-01-28 10:53:19 +0800118 sizeof(char *) + sizeof(u64) +
Len Brown4be44fc2005-08-05 00:44:28 -0400119 sizeof(char);
120 tail_offset += sizeof(char *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121 break;
122 default:
Len Browncece9292006-06-26 23:04:31 -0400123 printk(KERN_WARNING PREFIX "Invalid package element"
Colin Ian Kinge7e92ec92013-10-29 10:34:19 +0000124 " [%d]: got number, expecting"
Len Browncece9292006-06-26 23:04:31 -0400125 " [%c]\n",
126 i, format_string[i]);
Patrick Mocheld550d982006-06-27 00:41:40 -0400127 return AE_BAD_DATA;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128 break;
129 }
130 break;
131
132 case ACPI_TYPE_STRING:
133 case ACPI_TYPE_BUFFER:
134 switch (format_string[i]) {
135 case 'S':
Len Brown4be44fc2005-08-05 00:44:28 -0400136 size_required +=
137 sizeof(char *) +
138 (element->string.length * sizeof(char)) +
139 sizeof(char);
140 tail_offset += sizeof(char *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141 break;
142 case 'B':
Len Brown4be44fc2005-08-05 00:44:28 -0400143 size_required +=
144 sizeof(u8 *) +
145 (element->buffer.length * sizeof(u8));
146 tail_offset += sizeof(u8 *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147 break;
148 default:
Len Browncece9292006-06-26 23:04:31 -0400149 printk(KERN_WARNING PREFIX "Invalid package element"
Thomas Renningera6fc6722006-06-26 23:58:43 -0400150 " [%d] got string/buffer,"
Colin Ian Kinge7e92ec92013-10-29 10:34:19 +0000151 " expecting [%c]\n",
Len Browncece9292006-06-26 23:04:31 -0400152 i, format_string[i]);
Patrick Mocheld550d982006-06-27 00:41:40 -0400153 return AE_BAD_DATA;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154 break;
155 }
156 break;
157
158 case ACPI_TYPE_PACKAGE:
159 default:
Len Brown4be44fc2005-08-05 00:44:28 -0400160 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
161 "Found unsupported element at index=%d\n",
162 i));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163 /* TBD: handle nested packages... */
Patrick Mocheld550d982006-06-27 00:41:40 -0400164 return AE_SUPPORT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165 break;
166 }
167 }
168
169 /*
170 * Validate output buffer.
171 */
Al Stonee83dda02013-10-09 14:21:10 -0600172 if (buffer->length == ACPI_ALLOCATE_BUFFER) {
173 buffer->pointer = ACPI_ALLOCATE(size_required);
174 if (!buffer->pointer)
175 return AE_NO_MEMORY;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176 buffer->length = size_required;
Al Stonee83dda02013-10-09 14:21:10 -0600177 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 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186 }
187
188 head = buffer->pointer;
189 tail = buffer->pointer + tail_offset;
190
191 /*
192 * Extract package data.
193 */
Len Brown4be44fc2005-08-05 00:44:28 -0400194 for (i = 0; i < format_count; i++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195
196 u8 **pointer = NULL;
197 union acpi_object *element = &(package->package.elements[i]);
198
199 if (!element) {
Patrick Mocheld550d982006-06-27 00:41:40 -0400200 return AE_BAD_DATA;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201 }
202
203 switch (element->type) {
204
205 case ACPI_TYPE_INTEGER:
206 switch (format_string[i]) {
207 case 'N':
Lin Ming439913f2010-01-28 10:53:19 +0800208 *((u64 *) head) =
Len Brown4be44fc2005-08-05 00:44:28 -0400209 element->integer.value;
Lin Ming439913f2010-01-28 10:53:19 +0800210 head += sizeof(u64);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211 break;
212 case 'S':
Len Brown4be44fc2005-08-05 00:44:28 -0400213 pointer = (u8 **) head;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214 *pointer = tail;
Lin Ming439913f2010-01-28 10:53:19 +0800215 *((u64 *) tail) =
Len Brown4be44fc2005-08-05 00:44:28 -0400216 element->integer.value;
Lin Ming439913f2010-01-28 10:53:19 +0800217 head += sizeof(u64 *);
218 tail += sizeof(u64);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219 /* 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':
Len Brown4be44fc2005-08-05 00:44:28 -0400233 pointer = (u8 **) head;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234 *pointer = tail;
Len Brown4be44fc2005-08-05 00:44:28 -0400235 memcpy(tail, element->string.pointer,
236 element->string.length);
237 head += sizeof(char *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238 tail += element->string.length * sizeof(char);
239 /* NULL terminate string */
240 *tail = (char)0;
241 tail += sizeof(char);
242 break;
243 case 'B':
Len Brown4be44fc2005-08-05 00:44:28 -0400244 pointer = (u8 **) head;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245 *pointer = tail;
Len Brown4be44fc2005-08-05 00:44:28 -0400246 memcpy(tail, element->buffer.pointer,
247 element->buffer.length);
248 head += sizeof(u8 *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249 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
Patrick Mocheld550d982006-06-27 00:41:40 -0400265 return AE_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266}
Len Brown4be44fc2005-08-05 00:44:28 -0400267
Linus Torvalds1da177e2005-04-16 15:20:36 -0700268EXPORT_SYMBOL(acpi_extract_package);
269
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270acpi_status
Len Brown4be44fc2005-08-05 00:44:28 -0400271acpi_evaluate_integer(acpi_handle handle,
272 acpi_string pathname,
Matthew Wilcox27663c52008-10-10 02:22:59 -0400273 struct acpi_object_list *arguments, unsigned long long *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700274{
Len Brown4be44fc2005-08-05 00:44:28 -0400275 acpi_status status = AE_OK;
Pavel Machek40599072008-11-25 12:05:08 +0100276 union acpi_object element;
Len Brown4be44fc2005-08-05 00:44:28 -0400277 struct acpi_buffer buffer = { 0, NULL };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700278
Linus Torvalds1da177e2005-04-16 15:20:36 -0700279 if (!data)
Patrick Mocheld550d982006-06-27 00:41:40 -0400280 return AE_BAD_PARAMETER;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700281
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282 buffer.length = sizeof(union acpi_object);
Pavel Machek40599072008-11-25 12:05:08 +0100283 buffer.pointer = &element;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284 status = acpi_evaluate_object(handle, pathname, arguments, &buffer);
285 if (ACPI_FAILURE(status)) {
286 acpi_util_eval_error(handle, pathname, status);
Patrick Mocheld550d982006-06-27 00:41:40 -0400287 return status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288 }
289
Pavel Machek40599072008-11-25 12:05:08 +0100290 if (element.type != ACPI_TYPE_INTEGER) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291 acpi_util_eval_error(handle, pathname, AE_BAD_DATA);
Patrick Mocheld550d982006-06-27 00:41:40 -0400292 return AE_BAD_DATA;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293 }
294
Pavel Machek40599072008-11-25 12:05:08 +0100295 *data = element.integer.value;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296
Matthew Wilcox27663c52008-10-10 02:22:59 -0400297 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Return value [%llu]\n", *data));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700298
Patrick Mocheld550d982006-06-27 00:41:40 -0400299 return AE_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700301
Len Brown4be44fc2005-08-05 00:44:28 -0400302EXPORT_SYMBOL(acpi_evaluate_integer);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303
Linus Torvalds1da177e2005-04-16 15:20:36 -0700304acpi_status
Len Brown4be44fc2005-08-05 00:44:28 -0400305acpi_evaluate_reference(acpi_handle handle,
306 acpi_string pathname,
307 struct acpi_object_list *arguments,
308 struct acpi_handle_list *list)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700309{
Len Brown4be44fc2005-08-05 00:44:28 -0400310 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;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700315
Linus Torvalds1da177e2005-04-16 15:20:36 -0700316
317 if (!list) {
Patrick Mocheld550d982006-06-27 00:41:40 -0400318 return AE_BAD_PARAMETER;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319 }
320
321 /* Evaluate object. */
322
323 status = acpi_evaluate_object(handle, pathname, arguments, &buffer);
324 if (ACPI_FAILURE(status))
325 goto end;
326
Jan Engelhardt50dd0962006-10-01 00:28:50 +0200327 package = buffer.pointer;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700328
329 if ((buffer.length == 0) || !package) {
Len Brown64684632006-06-26 23:41:38 -0400330 printk(KERN_ERR PREFIX "No return object (len %X ptr %p)\n",
331 (unsigned)buffer.length, package);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700332 status = AE_BAD_DATA;
333 acpi_util_eval_error(handle, pathname, status);
334 goto end;
335 }
336 if (package->type != ACPI_TYPE_PACKAGE) {
Len Brown64684632006-06-26 23:41:38 -0400337 printk(KERN_ERR PREFIX "Expecting a [Package], found type %X\n",
338 package->type);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700339 status = AE_BAD_DATA;
340 acpi_util_eval_error(handle, pathname, status);
341 goto end;
342 }
343 if (!package->package.count) {
Len Brown64684632006-06-26 23:41:38 -0400344 printk(KERN_ERR PREFIX "[Package] has zero elements (%p)\n",
345 package);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700346 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) {
Patrick Mocheld550d982006-06-27 00:41:40 -0400352 return AE_NO_MEMORY;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700353 }
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
Bob Moorecd0b2242008-04-10 19:06:43 +0400362 if (element->type != ACPI_TYPE_LOCAL_REFERENCE) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363 status = AE_BAD_DATA;
Len Brown64684632006-06-26 23:41:38 -0400364 printk(KERN_ERR PREFIX
365 "Expecting a [Reference] package element, found type %X\n",
366 element->type);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700367 acpi_util_eval_error(handle, pathname, status);
368 break;
369 }
370
Thomas Renningerb6a16382008-03-12 01:06:24 +0100371 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 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700377 /* Get the acpi_handle. */
378
379 list->handles[i] = element->reference.handle;
380 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found reference [%p]\n",
Len Brown4be44fc2005-08-05 00:44:28 -0400381 list->handles[i]));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700382 }
383
Len Brown4be44fc2005-08-05 00:44:28 -0400384 end:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385 if (ACPI_FAILURE(status)) {
386 list->count = 0;
387 //kfree(list->handles);
388 }
389
Len Brown02438d82006-06-30 03:19:10 -0400390 kfree(buffer.pointer);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700391
Patrick Mocheld550d982006-06-27 00:41:40 -0400392 return status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700393}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394
Len Brown4be44fc2005-08-05 00:44:28 -0400395EXPORT_SYMBOL(acpi_evaluate_reference);
Matthew Garrett38ac0f12012-05-11 16:08:26 +0800396
397acpi_status
Feng Tang8ede06a2012-08-21 09:56:58 +0800398acpi_get_physical_device_location(acpi_handle handle, struct acpi_pld_info **pld)
Matthew Garrett38ac0f12012-05-11 16:08:26 +0800399{
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
Feng Tang8ede06a2012-08-21 09:56:58 +0800414 || output->package.elements[0].buffer.length < ACPI_PLD_REV1_BUFFER_SIZE) {
Matthew Garrett38ac0f12012-05-11 16:08:26 +0800415 status = AE_TYPE;
416 goto out;
417 }
418
Feng Tang8ede06a2012-08-21 09:56:58 +0800419 status = acpi_decode_pld_buffer(
420 output->package.elements[0].buffer.pointer,
421 output->package.elements[0].buffer.length,
422 pld);
423
Matthew Garrett38ac0f12012-05-11 16:08:26 +0800424out:
425 kfree(buffer.pointer);
426 return status;
427}
428EXPORT_SYMBOL(acpi_get_physical_device_location);
Toshi Kani275c58d2012-05-23 20:25:19 -0600429
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 */
441acpi_status
442acpi_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}
470EXPORT_SYMBOL(acpi_evaluate_hotplug_ost);
Toshi Kanifbfddae2012-11-21 01:36:28 +0000471
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 */
480void
481acpi_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}
506EXPORT_SYMBOL(acpi_handle_printk);
Jiang Liu952c63e2013-06-29 00:24:38 +0800507
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 */
515bool 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}
521EXPORT_SYMBOL(acpi_has_method);
Jiang Liu0db98202013-06-29 00:24:39 +0800522
523acpi_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}
533EXPORT_SYMBOL(acpi_execute_simple_method);
Jiang Liu7d2421f2013-06-29 00:24:40 +0800534
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 */
541acpi_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 */
561acpi_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}