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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> | |
28 | #include <linux/init.h> | |
29 | #include <linux/types.h> | |
30 | #include <acpi/acpi_bus.h> | |
31 | #include <acpi/acpi_drivers.h> | |
32 | ||
33 | ||
34 | #define _COMPONENT ACPI_BUS_COMPONENT | |
35 | ACPI_MODULE_NAME ("acpi_utils") | |
36 | ||
37 | ||
38 | /* -------------------------------------------------------------------------- | |
39 | Object Evaluation Helpers | |
40 | -------------------------------------------------------------------------- */ | |
41 | ||
42 | #ifdef ACPI_DEBUG_OUTPUT | |
43 | #define acpi_util_eval_error(h,p,s) {\ | |
44 | char prefix[80] = {'\0'};\ | |
45 | struct acpi_buffer buffer = {sizeof(prefix), prefix};\ | |
46 | acpi_get_name(h, ACPI_FULL_PATHNAME, &buffer);\ | |
47 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Evaluate [%s.%s]: %s\n",\ | |
48 | (char *) prefix, p, acpi_format_exception(s))); } | |
49 | #else | |
50 | #define acpi_util_eval_error(h,p,s) | |
51 | #endif | |
52 | ||
53 | ||
54 | acpi_status | |
55 | acpi_extract_package ( | |
56 | union acpi_object *package, | |
57 | struct acpi_buffer *format, | |
58 | 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 | ACPI_FUNCTION_TRACE("acpi_extract_package"); | |
69 | ||
70 | if (!package || (package->type != ACPI_TYPE_PACKAGE) || (package->package.count < 1)) { | |
71 | ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Invalid 'package' argument\n")); | |
72 | return_ACPI_STATUS(AE_BAD_PARAMETER); | |
73 | } | |
74 | ||
75 | if (!format || !format->pointer || (format->length < 1)) { | |
76 | ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Invalid 'format' argument\n")); | |
77 | return_ACPI_STATUS(AE_BAD_PARAMETER); | |
78 | } | |
79 | ||
80 | if (!buffer) { | |
81 | ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Invalid 'buffer' argument\n")); | |
82 | return_ACPI_STATUS(AE_BAD_PARAMETER); | |
83 | } | |
84 | ||
85 | format_count = (format->length/sizeof(char)) - 1; | |
86 | if (format_count > package->package.count) { | |
87 | ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Format specifies more objects [%d] than exist in package [%d].", format_count, package->package.count)); | |
88 | return_ACPI_STATUS(AE_BAD_DATA); | |
89 | } | |
90 | ||
91 | format_string = (char*)format->pointer; | |
92 | ||
93 | /* | |
94 | * Calculate size_required. | |
95 | */ | |
96 | for (i=0; i<format_count; i++) { | |
97 | ||
98 | union acpi_object *element = &(package->package.elements[i]); | |
99 | ||
100 | if (!element) { | |
101 | return_ACPI_STATUS(AE_BAD_DATA); | |
102 | } | |
103 | ||
104 | switch (element->type) { | |
105 | ||
106 | case ACPI_TYPE_INTEGER: | |
107 | switch (format_string[i]) { | |
108 | case 'N': | |
109 | size_required += sizeof(acpi_integer); | |
110 | tail_offset += sizeof(acpi_integer); | |
111 | break; | |
112 | case 'S': | |
113 | size_required += sizeof(char*) + sizeof(acpi_integer) + sizeof(char); | |
114 | tail_offset += sizeof(char*); | |
115 | break; | |
116 | default: | |
117 | ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Invalid package element [%d]: got number, expecing [%c].\n", i, format_string[i])); | |
118 | return_ACPI_STATUS(AE_BAD_DATA); | |
119 | break; | |
120 | } | |
121 | break; | |
122 | ||
123 | case ACPI_TYPE_STRING: | |
124 | case ACPI_TYPE_BUFFER: | |
125 | switch (format_string[i]) { | |
126 | case 'S': | |
127 | size_required += sizeof(char*) + (element->string.length * sizeof(char)) + sizeof(char); | |
128 | tail_offset += sizeof(char*); | |
129 | break; | |
130 | case 'B': | |
131 | size_required += sizeof(u8*) + (element->buffer.length * sizeof(u8)); | |
132 | tail_offset += sizeof(u8*); | |
133 | break; | |
134 | default: | |
135 | ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Invalid package element [%d] got string/buffer, expecing [%c].\n", i, format_string[i])); | |
136 | return_ACPI_STATUS(AE_BAD_DATA); | |
137 | break; | |
138 | } | |
139 | break; | |
140 | ||
141 | case ACPI_TYPE_PACKAGE: | |
142 | default: | |
143 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found unsupported element at index=%d\n", i)); | |
144 | /* TBD: handle nested packages... */ | |
145 | return_ACPI_STATUS(AE_SUPPORT); | |
146 | break; | |
147 | } | |
148 | } | |
149 | ||
150 | /* | |
151 | * Validate output buffer. | |
152 | */ | |
153 | if (buffer->length < size_required) { | |
154 | buffer->length = size_required; | |
155 | return_ACPI_STATUS(AE_BUFFER_OVERFLOW); | |
156 | } | |
157 | else if (buffer->length != size_required || !buffer->pointer) { | |
158 | return_ACPI_STATUS(AE_BAD_PARAMETER); | |
159 | } | |
160 | ||
161 | head = buffer->pointer; | |
162 | tail = buffer->pointer + tail_offset; | |
163 | ||
164 | /* | |
165 | * Extract package data. | |
166 | */ | |
167 | for (i=0; i<format_count; i++) { | |
168 | ||
169 | u8 **pointer = NULL; | |
170 | union acpi_object *element = &(package->package.elements[i]); | |
171 | ||
172 | if (!element) { | |
173 | return_ACPI_STATUS(AE_BAD_DATA); | |
174 | } | |
175 | ||
176 | switch (element->type) { | |
177 | ||
178 | case ACPI_TYPE_INTEGER: | |
179 | switch (format_string[i]) { | |
180 | case 'N': | |
181 | *((acpi_integer*)head) = element->integer.value; | |
182 | head += sizeof(acpi_integer); | |
183 | break; | |
184 | case 'S': | |
185 | pointer = (u8**)head; | |
186 | *pointer = tail; | |
187 | *((acpi_integer*)tail) = element->integer.value; | |
188 | head += sizeof(acpi_integer*); | |
189 | tail += sizeof(acpi_integer); | |
190 | /* NULL terminate string */ | |
191 | *tail = (char)0; | |
192 | tail += sizeof(char); | |
193 | break; | |
194 | default: | |
195 | /* Should never get here */ | |
196 | break; | |
197 | } | |
198 | break; | |
199 | ||
200 | case ACPI_TYPE_STRING: | |
201 | case ACPI_TYPE_BUFFER: | |
202 | switch (format_string[i]) { | |
203 | case 'S': | |
204 | pointer = (u8**)head; | |
205 | *pointer = tail; | |
206 | memcpy(tail, element->string.pointer, element->string.length); | |
207 | head += sizeof(char*); | |
208 | tail += element->string.length * sizeof(char); | |
209 | /* NULL terminate string */ | |
210 | *tail = (char)0; | |
211 | tail += sizeof(char); | |
212 | break; | |
213 | case 'B': | |
214 | pointer = (u8**)head; | |
215 | *pointer = tail; | |
216 | memcpy(tail, element->buffer.pointer, element->buffer.length); | |
217 | head += sizeof(u8*); | |
218 | tail += element->buffer.length * sizeof(u8); | |
219 | break; | |
220 | default: | |
221 | /* Should never get here */ | |
222 | break; | |
223 | } | |
224 | break; | |
225 | ||
226 | case ACPI_TYPE_PACKAGE: | |
227 | /* TBD: handle nested packages... */ | |
228 | default: | |
229 | /* Should never get here */ | |
230 | break; | |
231 | } | |
232 | } | |
233 | ||
234 | return_ACPI_STATUS(AE_OK); | |
235 | } | |
236 | EXPORT_SYMBOL(acpi_extract_package); | |
237 | ||
238 | ||
239 | acpi_status | |
240 | acpi_evaluate_integer ( | |
241 | acpi_handle handle, | |
242 | acpi_string pathname, | |
243 | struct acpi_object_list *arguments, | |
244 | unsigned long *data) | |
245 | { | |
246 | acpi_status status = AE_OK; | |
247 | union acpi_object *element; | |
248 | struct acpi_buffer buffer = {0,NULL}; | |
249 | ||
250 | ACPI_FUNCTION_TRACE("acpi_evaluate_integer"); | |
251 | ||
252 | if (!data) | |
253 | return_ACPI_STATUS(AE_BAD_PARAMETER); | |
254 | ||
255 | element = kmalloc(sizeof(union acpi_object), GFP_KERNEL); | |
256 | if(!element) | |
257 | return_ACPI_STATUS(AE_NO_MEMORY); | |
258 | ||
259 | memset(element, 0, sizeof(union acpi_object)); | |
260 | buffer.length = sizeof(union acpi_object); | |
261 | buffer.pointer = element; | |
262 | status = acpi_evaluate_object(handle, pathname, arguments, &buffer); | |
263 | if (ACPI_FAILURE(status)) { | |
264 | acpi_util_eval_error(handle, pathname, status); | |
265 | return_ACPI_STATUS(status); | |
266 | } | |
267 | ||
268 | if (element->type != ACPI_TYPE_INTEGER) { | |
269 | acpi_util_eval_error(handle, pathname, AE_BAD_DATA); | |
270 | return_ACPI_STATUS(AE_BAD_DATA); | |
271 | } | |
272 | ||
273 | *data = element->integer.value; | |
274 | kfree(element); | |
275 | ||
276 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Return value [%lu]\n", *data)); | |
277 | ||
278 | return_ACPI_STATUS(AE_OK); | |
279 | } | |
280 | EXPORT_SYMBOL(acpi_evaluate_integer); | |
281 | ||
282 | ||
283 | #if 0 | |
284 | acpi_status | |
285 | acpi_evaluate_string ( | |
286 | acpi_handle handle, | |
287 | acpi_string pathname, | |
288 | acpi_object_list *arguments, | |
289 | acpi_string *data) | |
290 | { | |
291 | acpi_status status = AE_OK; | |
292 | acpi_object *element = NULL; | |
293 | acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL}; | |
294 | ||
295 | ACPI_FUNCTION_TRACE("acpi_evaluate_string"); | |
296 | ||
297 | if (!data) | |
298 | return_ACPI_STATUS(AE_BAD_PARAMETER); | |
299 | ||
300 | status = acpi_evaluate_object(handle, pathname, arguments, &buffer); | |
301 | if (ACPI_FAILURE(status)) { | |
302 | acpi_util_eval_error(handle, pathname, status); | |
303 | return_ACPI_STATUS(status); | |
304 | } | |
305 | ||
306 | element = (acpi_object *) buffer.pointer; | |
307 | ||
308 | if ((element->type != ACPI_TYPE_STRING) | |
309 | || (element->type != ACPI_TYPE_BUFFER) | |
310 | || !element->string.length) { | |
311 | acpi_util_eval_error(handle, pathname, AE_BAD_DATA); | |
312 | return_ACPI_STATUS(AE_BAD_DATA); | |
313 | } | |
314 | ||
315 | *data = kmalloc(element->string.length + 1, GFP_KERNEL); | |
316 | if (!data) { | |
317 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Memory allocation error\n")); | |
318 | return_VALUE(-ENOMEM); | |
319 | } | |
320 | memset(*data, 0, element->string.length + 1); | |
321 | ||
322 | memcpy(*data, element->string.pointer, element->string.length); | |
323 | ||
324 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Return value [%s]\n", *data)); | |
325 | ||
326 | acpi_os_free(buffer.pointer); | |
327 | ||
328 | return_ACPI_STATUS(AE_OK); | |
329 | } | |
330 | #endif | |
331 | ||
332 | ||
333 | acpi_status | |
334 | acpi_evaluate_reference ( | |
335 | acpi_handle handle, | |
336 | acpi_string pathname, | |
337 | struct acpi_object_list *arguments, | |
338 | struct acpi_handle_list *list) | |
339 | { | |
340 | acpi_status status = AE_OK; | |
341 | union acpi_object *package = NULL; | |
342 | union acpi_object *element = NULL; | |
343 | struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL}; | |
344 | u32 i = 0; | |
345 | ||
346 | ACPI_FUNCTION_TRACE("acpi_evaluate_reference"); | |
347 | ||
348 | if (!list) { | |
349 | return_ACPI_STATUS(AE_BAD_PARAMETER); | |
350 | } | |
351 | ||
352 | /* Evaluate object. */ | |
353 | ||
354 | status = acpi_evaluate_object(handle, pathname, arguments, &buffer); | |
355 | if (ACPI_FAILURE(status)) | |
356 | goto end; | |
357 | ||
358 | package = (union acpi_object *) buffer.pointer; | |
359 | ||
360 | if ((buffer.length == 0) || !package) { | |
361 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, | |
362 | "No return object (len %X ptr %p)\n", | |
363 | (unsigned)buffer.length, package)); | |
364 | status = AE_BAD_DATA; | |
365 | acpi_util_eval_error(handle, pathname, status); | |
366 | goto end; | |
367 | } | |
368 | if (package->type != ACPI_TYPE_PACKAGE) { | |
369 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, | |
370 | "Expecting a [Package], found type %X\n", | |
371 | package->type)); | |
372 | status = AE_BAD_DATA; | |
373 | acpi_util_eval_error(handle, pathname, status); | |
374 | goto end; | |
375 | } | |
376 | if (!package->package.count) { | |
377 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, | |
378 | "[Package] has zero elements (%p)\n", | |
379 | package)); | |
380 | status = AE_BAD_DATA; | |
381 | acpi_util_eval_error(handle, pathname, status); | |
382 | goto end; | |
383 | } | |
384 | ||
385 | if (package->package.count > ACPI_MAX_HANDLES) { | |
386 | return_ACPI_STATUS(AE_NO_MEMORY); | |
387 | } | |
388 | list->count = package->package.count; | |
389 | ||
390 | /* Extract package data. */ | |
391 | ||
392 | for (i = 0; i < list->count; i++) { | |
393 | ||
394 | element = &(package->package.elements[i]); | |
395 | ||
396 | if (element->type != ACPI_TYPE_ANY) { | |
397 | status = AE_BAD_DATA; | |
398 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, | |
399 | "Expecting a [Reference] package element, found type %X\n", | |
400 | element->type)); | |
401 | acpi_util_eval_error(handle, pathname, status); | |
402 | break; | |
403 | } | |
404 | ||
405 | /* Get the acpi_handle. */ | |
406 | ||
407 | list->handles[i] = element->reference.handle; | |
408 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found reference [%p]\n", | |
409 | list->handles[i])); | |
410 | } | |
411 | ||
412 | end: | |
413 | if (ACPI_FAILURE(status)) { | |
414 | list->count = 0; | |
415 | //kfree(list->handles); | |
416 | } | |
417 | ||
418 | acpi_os_free(buffer.pointer); | |
419 | ||
420 | return_ACPI_STATUS(status); | |
421 | } | |
422 | EXPORT_SYMBOL(acpi_evaluate_reference); | |
423 |