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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>
28#include <linux/slab.h>
29#include <linux/init.h>
30#include <linux/types.h>
31#include <acpi/acpi_bus.h>
32#include <acpi/acpi_drivers.h>
33
34#include "internal.h"
35
36#define _COMPONENT ACPI_BUS_COMPONENT
37ACPI_MODULE_NAME("utils");
38
39/* --------------------------------------------------------------------------
40 Object Evaluation Helpers
41 -------------------------------------------------------------------------- */
42static void
43acpi_util_eval_error(acpi_handle h, acpi_string p, acpi_status s)
44{
45#ifdef ACPI_DEBUG_OUTPUT
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)));
51#else
52 return;
53#endif
54}
55
56acpi_status
57acpi_extract_package(union acpi_object *package,
58 struct acpi_buffer *format, struct acpi_buffer *buffer)
59{
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;
67
68
69 if (!package || (package->type != ACPI_TYPE_PACKAGE)
70 || (package->package.count < 1)) {
71 printk(KERN_WARNING PREFIX "Invalid package argument\n");
72 return AE_BAD_PARAMETER;
73 }
74
75 if (!format || !format->pointer || (format->length < 1)) {
76 printk(KERN_WARNING PREFIX "Invalid format argument\n");
77 return AE_BAD_PARAMETER;
78 }
79
80 if (!buffer) {
81 printk(KERN_WARNING PREFIX "Invalid buffer argument\n");
82 return AE_BAD_PARAMETER;
83 }
84
85 format_count = (format->length / sizeof(char)) - 1;
86 if (format_count > package->package.count) {
87 printk(KERN_WARNING PREFIX "Format specifies more objects [%d]"
88 " than exist in package [%d].\n",
89 format_count, package->package.count);
90 return AE_BAD_DATA;
91 }
92
93 format_string = format->pointer;
94
95 /*
96 * Calculate size_required.
97 */
98 for (i = 0; i < format_count; i++) {
99
100 union acpi_object *element = &(package->package.elements[i]);
101
102 if (!element) {
103 return AE_BAD_DATA;
104 }
105
106 switch (element->type) {
107
108 case ACPI_TYPE_INTEGER:
109 switch (format_string[i]) {
110 case 'N':
111 size_required += sizeof(u64);
112 tail_offset += sizeof(u64);
113 break;
114 case 'S':
115 size_required +=
116 sizeof(char *) + sizeof(u64) +
117 sizeof(char);
118 tail_offset += sizeof(char *);
119 break;
120 default:
121 printk(KERN_WARNING PREFIX "Invalid package element"
122 " [%d]: got number, expecing"
123 " [%c]\n",
124 i, format_string[i]);
125 return AE_BAD_DATA;
126 break;
127 }
128 break;
129
130 case ACPI_TYPE_STRING:
131 case ACPI_TYPE_BUFFER:
132 switch (format_string[i]) {
133 case 'S':
134 size_required +=
135 sizeof(char *) +
136 (element->string.length * sizeof(char)) +
137 sizeof(char);
138 tail_offset += sizeof(char *);
139 break;
140 case 'B':
141 size_required +=
142 sizeof(u8 *) +
143 (element->buffer.length * sizeof(u8));
144 tail_offset += sizeof(u8 *);
145 break;
146 default:
147 printk(KERN_WARNING PREFIX "Invalid package element"
148 " [%d] got string/buffer,"
149 " expecing [%c]\n",
150 i, format_string[i]);
151 return AE_BAD_DATA;
152 break;
153 }
154 break;
155
156 case ACPI_TYPE_PACKAGE:
157 default:
158 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
159 "Found unsupported element at index=%d\n",
160 i));
161 /* TBD: handle nested packages... */
162 return AE_SUPPORT;
163 break;
164 }
165 }
166
167 /*
168 * Validate output buffer.
169 */
170 if (buffer->length < size_required) {
171 buffer->length = size_required;
172 return AE_BUFFER_OVERFLOW;
173 } else if (buffer->length != size_required || !buffer->pointer) {
174 return AE_BAD_PARAMETER;
175 }
176
177 head = buffer->pointer;
178 tail = buffer->pointer + tail_offset;
179
180 /*
181 * Extract package data.
182 */
183 for (i = 0; i < format_count; i++) {
184
185 u8 **pointer = NULL;
186 union acpi_object *element = &(package->package.elements[i]);
187
188 if (!element) {
189 return AE_BAD_DATA;
190 }
191
192 switch (element->type) {
193
194 case ACPI_TYPE_INTEGER:
195 switch (format_string[i]) {
196 case 'N':
197 *((u64 *) head) =
198 element->integer.value;
199 head += sizeof(u64);
200 break;
201 case 'S':
202 pointer = (u8 **) head;
203 *pointer = tail;
204 *((u64 *) tail) =
205 element->integer.value;
206 head += sizeof(u64 *);
207 tail += sizeof(u64);
208 /* NULL terminate string */
209 *tail = (char)0;
210 tail += sizeof(char);
211 break;
212 default:
213 /* Should never get here */
214 break;
215 }
216 break;
217
218 case ACPI_TYPE_STRING:
219 case ACPI_TYPE_BUFFER:
220 switch (format_string[i]) {
221 case 'S':
222 pointer = (u8 **) head;
223 *pointer = tail;
224 memcpy(tail, element->string.pointer,
225 element->string.length);
226 head += sizeof(char *);
227 tail += element->string.length * sizeof(char);
228 /* NULL terminate string */
229 *tail = (char)0;
230 tail += sizeof(char);
231 break;
232 case 'B':
233 pointer = (u8 **) head;
234 *pointer = tail;
235 memcpy(tail, element->buffer.pointer,
236 element->buffer.length);
237 head += sizeof(u8 *);
238 tail += element->buffer.length * sizeof(u8);
239 break;
240 default:
241 /* Should never get here */
242 break;
243 }
244 break;
245
246 case ACPI_TYPE_PACKAGE:
247 /* TBD: handle nested packages... */
248 default:
249 /* Should never get here */
250 break;
251 }
252 }
253
254 return AE_OK;
255}
256
257EXPORT_SYMBOL(acpi_extract_package);
258
259acpi_status
260acpi_evaluate_integer(acpi_handle handle,
261 acpi_string pathname,
262 struct acpi_object_list *arguments, unsigned long long *data)
263{
264 acpi_status status = AE_OK;
265 union acpi_object element;
266 struct acpi_buffer buffer = { 0, NULL };
267
268 if (!data)
269 return AE_BAD_PARAMETER;
270
271 buffer.length = sizeof(union acpi_object);
272 buffer.pointer = &element;
273 status = acpi_evaluate_object(handle, pathname, arguments, &buffer);
274 if (ACPI_FAILURE(status)) {
275 acpi_util_eval_error(handle, pathname, status);
276 return status;
277 }
278
279 if (element.type != ACPI_TYPE_INTEGER) {
280 acpi_util_eval_error(handle, pathname, AE_BAD_DATA);
281 return AE_BAD_DATA;
282 }
283
284 *data = element.integer.value;
285
286 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Return value [%llu]\n", *data));
287
288 return AE_OK;
289}
290
291EXPORT_SYMBOL(acpi_evaluate_integer);
292
293acpi_status
294acpi_evaluate_reference(acpi_handle handle,
295 acpi_string pathname,
296 struct acpi_object_list *arguments,
297 struct acpi_handle_list *list)
298{
299 acpi_status status = AE_OK;
300 union acpi_object *package = NULL;
301 union acpi_object *element = NULL;
302 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
303 u32 i = 0;
304
305
306 if (!list) {
307 return AE_BAD_PARAMETER;
308 }
309
310 /* Evaluate object. */
311
312 status = acpi_evaluate_object(handle, pathname, arguments, &buffer);
313 if (ACPI_FAILURE(status))
314 goto end;
315
316 package = buffer.pointer;
317
318 if ((buffer.length == 0) || !package) {
319 printk(KERN_ERR PREFIX "No return object (len %X ptr %p)\n",
320 (unsigned)buffer.length, package);
321 status = AE_BAD_DATA;
322 acpi_util_eval_error(handle, pathname, status);
323 goto end;
324 }
325 if (package->type != ACPI_TYPE_PACKAGE) {
326 printk(KERN_ERR PREFIX "Expecting a [Package], found type %X\n",
327 package->type);
328 status = AE_BAD_DATA;
329 acpi_util_eval_error(handle, pathname, status);
330 goto end;
331 }
332 if (!package->package.count) {
333 printk(KERN_ERR PREFIX "[Package] has zero elements (%p)\n",
334 package);
335 status = AE_BAD_DATA;
336 acpi_util_eval_error(handle, pathname, status);
337 goto end;
338 }
339
340 if (package->package.count > ACPI_MAX_HANDLES) {
341 return AE_NO_MEMORY;
342 }
343 list->count = package->package.count;
344
345 /* Extract package data. */
346
347 for (i = 0; i < list->count; i++) {
348
349 element = &(package->package.elements[i]);
350
351 if (element->type != ACPI_TYPE_LOCAL_REFERENCE) {
352 status = AE_BAD_DATA;
353 printk(KERN_ERR PREFIX
354 "Expecting a [Reference] package element, found type %X\n",
355 element->type);
356 acpi_util_eval_error(handle, pathname, status);
357 break;
358 }
359
360 if (!element->reference.handle) {
361 printk(KERN_WARNING PREFIX "Invalid reference in"
362 " package %s\n", pathname);
363 status = AE_NULL_ENTRY;
364 break;
365 }
366 /* Get the acpi_handle. */
367
368 list->handles[i] = element->reference.handle;
369 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found reference [%p]\n",
370 list->handles[i]));
371 }
372
373 end:
374 if (ACPI_FAILURE(status)) {
375 list->count = 0;
376 //kfree(list->handles);
377 }
378
379 kfree(buffer.pointer);
380
381 return status;
382}
383
384EXPORT_SYMBOL(acpi_evaluate_reference);
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>
28#include <linux/slab.h>
29#include <linux/init.h>
30#include <linux/types.h>
31#include <linux/hardirq.h>
32#include <linux/acpi.h>
33
34#include "internal.h"
35
36#define _COMPONENT ACPI_BUS_COMPONENT
37ACPI_MODULE_NAME("utils");
38
39/* --------------------------------------------------------------------------
40 Object Evaluation Helpers
41 -------------------------------------------------------------------------- */
42static void
43acpi_util_eval_error(acpi_handle h, acpi_string p, acpi_status s)
44{
45#ifdef ACPI_DEBUG_OUTPUT
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)));
51#else
52 return;
53#endif
54}
55
56acpi_status
57acpi_extract_package(union acpi_object *package,
58 struct acpi_buffer *format, struct acpi_buffer *buffer)
59{
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;
67
68
69 if (!package || (package->type != ACPI_TYPE_PACKAGE)
70 || (package->package.count < 1)) {
71 printk(KERN_WARNING PREFIX "Invalid package argument\n");
72 return AE_BAD_PARAMETER;
73 }
74
75 if (!format || !format->pointer || (format->length < 1)) {
76 printk(KERN_WARNING PREFIX "Invalid format argument\n");
77 return AE_BAD_PARAMETER;
78 }
79
80 if (!buffer) {
81 printk(KERN_WARNING PREFIX "Invalid buffer argument\n");
82 return AE_BAD_PARAMETER;
83 }
84
85 format_count = (format->length / sizeof(char)) - 1;
86 if (format_count > package->package.count) {
87 printk(KERN_WARNING PREFIX "Format specifies more objects [%d]"
88 " than exist in package [%d].\n",
89 format_count, package->package.count);
90 return AE_BAD_DATA;
91 }
92
93 format_string = format->pointer;
94
95 /*
96 * Calculate size_required.
97 */
98 for (i = 0; i < format_count; i++) {
99
100 union acpi_object *element = &(package->package.elements[i]);
101
102 switch (element->type) {
103
104 case ACPI_TYPE_INTEGER:
105 switch (format_string[i]) {
106 case 'N':
107 size_required += sizeof(u64);
108 tail_offset += sizeof(u64);
109 break;
110 case 'S':
111 size_required +=
112 sizeof(char *) + sizeof(u64) +
113 sizeof(char);
114 tail_offset += sizeof(char *);
115 break;
116 default:
117 printk(KERN_WARNING PREFIX "Invalid package element"
118 " [%d]: got number, expecting"
119 " [%c]\n",
120 i, format_string[i]);
121 return AE_BAD_DATA;
122 break;
123 }
124 break;
125
126 case ACPI_TYPE_STRING:
127 case ACPI_TYPE_BUFFER:
128 switch (format_string[i]) {
129 case 'S':
130 size_required +=
131 sizeof(char *) +
132 (element->string.length * sizeof(char)) +
133 sizeof(char);
134 tail_offset += sizeof(char *);
135 break;
136 case 'B':
137 size_required +=
138 sizeof(u8 *) +
139 (element->buffer.length * sizeof(u8));
140 tail_offset += sizeof(u8 *);
141 break;
142 default:
143 printk(KERN_WARNING PREFIX "Invalid package element"
144 " [%d] got string/buffer,"
145 " expecting [%c]\n",
146 i, format_string[i]);
147 return AE_BAD_DATA;
148 break;
149 }
150 break;
151
152 case ACPI_TYPE_PACKAGE:
153 default:
154 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
155 "Found unsupported element at index=%d\n",
156 i));
157 /* TBD: handle nested packages... */
158 return AE_SUPPORT;
159 break;
160 }
161 }
162
163 /*
164 * Validate output buffer.
165 */
166 if (buffer->length == ACPI_ALLOCATE_BUFFER) {
167 buffer->pointer = ACPI_ALLOCATE_ZEROED(size_required);
168 if (!buffer->pointer)
169 return AE_NO_MEMORY;
170 buffer->length = size_required;
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 }
179 }
180
181 head = buffer->pointer;
182 tail = buffer->pointer + tail_offset;
183
184 /*
185 * Extract package data.
186 */
187 for (i = 0; i < format_count; i++) {
188
189 u8 **pointer = NULL;
190 union acpi_object *element = &(package->package.elements[i]);
191
192 if (!element) {
193 return AE_BAD_DATA;
194 }
195
196 switch (element->type) {
197
198 case ACPI_TYPE_INTEGER:
199 switch (format_string[i]) {
200 case 'N':
201 *((u64 *) head) =
202 element->integer.value;
203 head += sizeof(u64);
204 break;
205 case 'S':
206 pointer = (u8 **) head;
207 *pointer = tail;
208 *((u64 *) tail) =
209 element->integer.value;
210 head += sizeof(u64 *);
211 tail += sizeof(u64);
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':
226 pointer = (u8 **) head;
227 *pointer = tail;
228 memcpy(tail, element->string.pointer,
229 element->string.length);
230 head += sizeof(char *);
231 tail += element->string.length * sizeof(char);
232 /* NULL terminate string */
233 *tail = (char)0;
234 tail += sizeof(char);
235 break;
236 case 'B':
237 pointer = (u8 **) head;
238 *pointer = tail;
239 memcpy(tail, element->buffer.pointer,
240 element->buffer.length);
241 head += sizeof(u8 *);
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
258 return AE_OK;
259}
260
261EXPORT_SYMBOL(acpi_extract_package);
262
263acpi_status
264acpi_evaluate_integer(acpi_handle handle,
265 acpi_string pathname,
266 struct acpi_object_list *arguments, unsigned long long *data)
267{
268 acpi_status status = AE_OK;
269 union acpi_object element;
270 struct acpi_buffer buffer = { 0, NULL };
271
272 if (!data)
273 return AE_BAD_PARAMETER;
274
275 buffer.length = sizeof(union acpi_object);
276 buffer.pointer = &element;
277 status = acpi_evaluate_object(handle, pathname, arguments, &buffer);
278 if (ACPI_FAILURE(status)) {
279 acpi_util_eval_error(handle, pathname, status);
280 return status;
281 }
282
283 if (element.type != ACPI_TYPE_INTEGER) {
284 acpi_util_eval_error(handle, pathname, AE_BAD_DATA);
285 return AE_BAD_DATA;
286 }
287
288 *data = element.integer.value;
289
290 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Return value [%llu]\n", *data));
291
292 return AE_OK;
293}
294
295EXPORT_SYMBOL(acpi_evaluate_integer);
296
297acpi_status
298acpi_evaluate_reference(acpi_handle handle,
299 acpi_string pathname,
300 struct acpi_object_list *arguments,
301 struct acpi_handle_list *list)
302{
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;
308
309
310 if (!list) {
311 return AE_BAD_PARAMETER;
312 }
313
314 /* Evaluate object. */
315
316 status = acpi_evaluate_object(handle, pathname, arguments, &buffer);
317 if (ACPI_FAILURE(status))
318 goto end;
319
320 package = buffer.pointer;
321
322 if ((buffer.length == 0) || !package) {
323 printk(KERN_ERR PREFIX "No return object (len %X ptr %p)\n",
324 (unsigned)buffer.length, package);
325 status = AE_BAD_DATA;
326 acpi_util_eval_error(handle, pathname, status);
327 goto end;
328 }
329 if (package->type != ACPI_TYPE_PACKAGE) {
330 printk(KERN_ERR PREFIX "Expecting a [Package], found type %X\n",
331 package->type);
332 status = AE_BAD_DATA;
333 acpi_util_eval_error(handle, pathname, status);
334 goto end;
335 }
336 if (!package->package.count) {
337 printk(KERN_ERR PREFIX "[Package] has zero elements (%p)\n",
338 package);
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) {
345 return AE_NO_MEMORY;
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
355 if (element->type != ACPI_TYPE_LOCAL_REFERENCE) {
356 status = AE_BAD_DATA;
357 printk(KERN_ERR PREFIX
358 "Expecting a [Reference] package element, found type %X\n",
359 element->type);
360 acpi_util_eval_error(handle, pathname, status);
361 break;
362 }
363
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 }
370 /* Get the acpi_handle. */
371
372 list->handles[i] = element->reference.handle;
373 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found reference [%p]\n",
374 list->handles[i]));
375 }
376
377 end:
378 if (ACPI_FAILURE(status)) {
379 list->count = 0;
380 //kfree(list->handles);
381 }
382
383 kfree(buffer.pointer);
384
385 return status;
386}
387
388EXPORT_SYMBOL(acpi_evaluate_reference);
389
390acpi_status
391acpi_get_physical_device_location(acpi_handle handle, struct acpi_pld_info **pld)
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
407 || output->package.elements[0].buffer.length < ACPI_PLD_REV1_BUFFER_SIZE) {
408 status = AE_TYPE;
409 goto out;
410 }
411
412 status = acpi_decode_pld_buffer(
413 output->package.elements[0].buffer.pointer,
414 output->package.elements[0].buffer.length,
415 pld);
416
417out:
418 kfree(buffer.pointer);
419 return status;
420}
421EXPORT_SYMBOL(acpi_get_physical_device_location);
422
423/**
424 * acpi_evaluate_ost: Evaluate _OST for hotplug operations
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 */
434acpi_status
435acpi_evaluate_ost(acpi_handle handle, u32 source_event, u32 status_code,
436 struct acpi_buffer *status_buf)
437{
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};
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
455 return acpi_evaluate_object(handle, "_OST", &arg_list, NULL);
456}
457EXPORT_SYMBOL(acpi_evaluate_ost);
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 */
467void
468acpi_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}
493EXPORT_SYMBOL(acpi_handle_printk);
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 */
502bool 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}
508EXPORT_SYMBOL(acpi_has_method);
509
510acpi_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}
520EXPORT_SYMBOL(acpi_execute_simple_method);
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 */
528acpi_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 */
548acpi_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}
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 */
579union acpi_object *
580acpi_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}
616EXPORT_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 */
630bool 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}
660EXPORT_SYMBOL(acpi_check_dsm);