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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/init.h> | |
29 | #include <linux/types.h> | |
30 | #include <acpi/acpi_bus.h> | |
31 | #include <acpi/acpi_drivers.h> | |
32 | ||
33 | #define _COMPONENT ACPI_BUS_COMPONENT | |
34 | ACPI_MODULE_NAME("utils"); | |
35 | ||
36 | /* -------------------------------------------------------------------------- | |
37 | Object Evaluation Helpers | |
38 | -------------------------------------------------------------------------- */ | |
39 | static void | |
40 | acpi_util_eval_error(acpi_handle h, acpi_string p, acpi_status s) | |
41 | { | |
42 | #ifdef ACPI_DEBUG_OUTPUT | |
43 | char prefix[80] = {'\0'}; | |
44 | struct acpi_buffer buffer = {sizeof(prefix), prefix}; | |
45 | acpi_get_name(h, ACPI_FULL_PATHNAME, &buffer); | |
46 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Evaluate [%s.%s]: %s\n", | |
47 | (char *) prefix, p, acpi_format_exception(s))); | |
48 | #else | |
49 | return; | |
50 | #endif | |
51 | } | |
52 | ||
53 | acpi_status | |
54 | acpi_extract_package(union acpi_object *package, | |
55 | struct acpi_buffer *format, struct acpi_buffer *buffer) | |
56 | { | |
57 | u32 size_required = 0; | |
58 | u32 tail_offset = 0; | |
59 | char *format_string = NULL; | |
60 | u32 format_count = 0; | |
61 | u32 i = 0; | |
62 | u8 *head = NULL; | |
63 | u8 *tail = NULL; | |
64 | ||
65 | ||
66 | if (!package || (package->type != ACPI_TYPE_PACKAGE) | |
67 | || (package->package.count < 1)) { | |
68 | printk(KERN_WARNING PREFIX "Invalid package argument\n"); | |
69 | return AE_BAD_PARAMETER; | |
70 | } | |
71 | ||
72 | if (!format || !format->pointer || (format->length < 1)) { | |
73 | printk(KERN_WARNING PREFIX "Invalid format argument\n"); | |
74 | return AE_BAD_PARAMETER; | |
75 | } | |
76 | ||
77 | if (!buffer) { | |
78 | printk(KERN_WARNING PREFIX "Invalid buffer argument\n"); | |
79 | return AE_BAD_PARAMETER; | |
80 | } | |
81 | ||
82 | format_count = (format->length / sizeof(char)) - 1; | |
83 | if (format_count > package->package.count) { | |
84 | printk(KERN_WARNING PREFIX "Format specifies more objects [%d]" | |
85 | " than exist in package [%d].\n", | |
86 | format_count, package->package.count); | |
87 | return AE_BAD_DATA; | |
88 | } | |
89 | ||
90 | format_string = format->pointer; | |
91 | ||
92 | /* | |
93 | * Calculate size_required. | |
94 | */ | |
95 | for (i = 0; i < format_count; i++) { | |
96 | ||
97 | union acpi_object *element = &(package->package.elements[i]); | |
98 | ||
99 | if (!element) { | |
100 | return AE_BAD_DATA; | |
101 | } | |
102 | ||
103 | switch (element->type) { | |
104 | ||
105 | case ACPI_TYPE_INTEGER: | |
106 | switch (format_string[i]) { | |
107 | case 'N': | |
108 | size_required += sizeof(acpi_integer); | |
109 | tail_offset += sizeof(acpi_integer); | |
110 | break; | |
111 | case 'S': | |
112 | size_required += | |
113 | sizeof(char *) + sizeof(acpi_integer) + | |
114 | sizeof(char); | |
115 | tail_offset += sizeof(char *); | |
116 | break; | |
117 | default: | |
118 | printk(KERN_WARNING PREFIX "Invalid package element" | |
119 | " [%d]: got number, expecing" | |
120 | " [%c]\n", | |
121 | i, format_string[i]); | |
122 | return AE_BAD_DATA; | |
123 | break; | |
124 | } | |
125 | break; | |
126 | ||
127 | case ACPI_TYPE_STRING: | |
128 | case ACPI_TYPE_BUFFER: | |
129 | switch (format_string[i]) { | |
130 | case 'S': | |
131 | size_required += | |
132 | sizeof(char *) + | |
133 | (element->string.length * sizeof(char)) + | |
134 | sizeof(char); | |
135 | tail_offset += sizeof(char *); | |
136 | break; | |
137 | case 'B': | |
138 | size_required += | |
139 | sizeof(u8 *) + | |
140 | (element->buffer.length * sizeof(u8)); | |
141 | tail_offset += sizeof(u8 *); | |
142 | break; | |
143 | default: | |
144 | printk(KERN_WARNING PREFIX "Invalid package element" | |
145 | " [%d] got string/buffer," | |
146 | " expecing [%c]\n", | |
147 | i, format_string[i]); | |
148 | return AE_BAD_DATA; | |
149 | break; | |
150 | } | |
151 | break; | |
152 | ||
153 | case ACPI_TYPE_PACKAGE: | |
154 | default: | |
155 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
156 | "Found unsupported element at index=%d\n", | |
157 | i)); | |
158 | /* TBD: handle nested packages... */ | |
159 | return AE_SUPPORT; | |
160 | break; | |
161 | } | |
162 | } | |
163 | ||
164 | /* | |
165 | * Validate output buffer. | |
166 | */ | |
167 | if (buffer->length < size_required) { | |
168 | buffer->length = size_required; | |
169 | return AE_BUFFER_OVERFLOW; | |
170 | } else if (buffer->length != size_required || !buffer->pointer) { | |
171 | return AE_BAD_PARAMETER; | |
172 | } | |
173 | ||
174 | head = buffer->pointer; | |
175 | tail = buffer->pointer + tail_offset; | |
176 | ||
177 | /* | |
178 | * Extract package data. | |
179 | */ | |
180 | for (i = 0; i < format_count; i++) { | |
181 | ||
182 | u8 **pointer = NULL; | |
183 | union acpi_object *element = &(package->package.elements[i]); | |
184 | ||
185 | if (!element) { | |
186 | return AE_BAD_DATA; | |
187 | } | |
188 | ||
189 | switch (element->type) { | |
190 | ||
191 | case ACPI_TYPE_INTEGER: | |
192 | switch (format_string[i]) { | |
193 | case 'N': | |
194 | *((acpi_integer *) head) = | |
195 | element->integer.value; | |
196 | head += sizeof(acpi_integer); | |
197 | break; | |
198 | case 'S': | |
199 | pointer = (u8 **) head; | |
200 | *pointer = tail; | |
201 | *((acpi_integer *) tail) = | |
202 | element->integer.value; | |
203 | head += sizeof(acpi_integer *); | |
204 | tail += sizeof(acpi_integer); | |
205 | /* NULL terminate string */ | |
206 | *tail = (char)0; | |
207 | tail += sizeof(char); | |
208 | break; | |
209 | default: | |
210 | /* Should never get here */ | |
211 | break; | |
212 | } | |
213 | break; | |
214 | ||
215 | case ACPI_TYPE_STRING: | |
216 | case ACPI_TYPE_BUFFER: | |
217 | switch (format_string[i]) { | |
218 | case 'S': | |
219 | pointer = (u8 **) head; | |
220 | *pointer = tail; | |
221 | memcpy(tail, element->string.pointer, | |
222 | element->string.length); | |
223 | head += sizeof(char *); | |
224 | tail += element->string.length * sizeof(char); | |
225 | /* NULL terminate string */ | |
226 | *tail = (char)0; | |
227 | tail += sizeof(char); | |
228 | break; | |
229 | case 'B': | |
230 | pointer = (u8 **) head; | |
231 | *pointer = tail; | |
232 | memcpy(tail, element->buffer.pointer, | |
233 | element->buffer.length); | |
234 | head += sizeof(u8 *); | |
235 | tail += element->buffer.length * sizeof(u8); | |
236 | break; | |
237 | default: | |
238 | /* Should never get here */ | |
239 | break; | |
240 | } | |
241 | break; | |
242 | ||
243 | case ACPI_TYPE_PACKAGE: | |
244 | /* TBD: handle nested packages... */ | |
245 | default: | |
246 | /* Should never get here */ | |
247 | break; | |
248 | } | |
249 | } | |
250 | ||
251 | return AE_OK; | |
252 | } | |
253 | ||
254 | EXPORT_SYMBOL(acpi_extract_package); | |
255 | ||
256 | acpi_status | |
257 | acpi_evaluate_integer(acpi_handle handle, | |
258 | acpi_string pathname, | |
259 | struct acpi_object_list *arguments, unsigned long *data) | |
260 | { | |
261 | acpi_status status = AE_OK; | |
262 | union acpi_object *element; | |
263 | struct acpi_buffer buffer = { 0, NULL }; | |
264 | ||
265 | ||
266 | if (!data) | |
267 | return AE_BAD_PARAMETER; | |
268 | ||
269 | element = kzalloc(sizeof(union acpi_object), irqs_disabled() ? GFP_ATOMIC: GFP_KERNEL); | |
270 | if (!element) | |
271 | return AE_NO_MEMORY; | |
272 | ||
273 | buffer.length = sizeof(union acpi_object); | |
274 | buffer.pointer = element; | |
275 | status = acpi_evaluate_object(handle, pathname, arguments, &buffer); | |
276 | if (ACPI_FAILURE(status)) { | |
277 | acpi_util_eval_error(handle, pathname, status); | |
278 | kfree(element); | |
279 | return status; | |
280 | } | |
281 | ||
282 | if (element->type != ACPI_TYPE_INTEGER) { | |
283 | acpi_util_eval_error(handle, pathname, AE_BAD_DATA); | |
284 | kfree(element); | |
285 | return AE_BAD_DATA; | |
286 | } | |
287 | ||
288 | *data = element->integer.value; | |
289 | kfree(element); | |
290 | ||
291 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Return value [%lu]\n", *data)); | |
292 | ||
293 | return AE_OK; | |
294 | } | |
295 | ||
296 | EXPORT_SYMBOL(acpi_evaluate_integer); | |
297 | ||
298 | #if 0 | |
299 | acpi_status | |
300 | acpi_evaluate_string(acpi_handle handle, | |
301 | acpi_string pathname, | |
302 | acpi_object_list * arguments, acpi_string * data) | |
303 | { | |
304 | acpi_status status = AE_OK; | |
305 | acpi_object *element = NULL; | |
306 | acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
307 | ||
308 | ||
309 | if (!data) | |
310 | return AE_BAD_PARAMETER; | |
311 | ||
312 | status = acpi_evaluate_object(handle, pathname, arguments, &buffer); | |
313 | if (ACPI_FAILURE(status)) { | |
314 | acpi_util_eval_error(handle, pathname, status); | |
315 | return status; | |
316 | } | |
317 | ||
318 | element = (acpi_object *) buffer.pointer; | |
319 | ||
320 | if ((element->type != ACPI_TYPE_STRING) | |
321 | || (element->type != ACPI_TYPE_BUFFER) | |
322 | || !element->string.length) { | |
323 | acpi_util_eval_error(handle, pathname, AE_BAD_DATA); | |
324 | return AE_BAD_DATA; | |
325 | } | |
326 | ||
327 | *data = kzalloc(element->string.length + 1, GFP_KERNEL); | |
328 | if (!data) { | |
329 | printk(KERN_ERR PREFIX "Memory allocation\n"); | |
330 | return -ENOMEM; | |
331 | } | |
332 | ||
333 | memcpy(*data, element->string.pointer, element->string.length); | |
334 | ||
335 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Return value [%s]\n", *data)); | |
336 | ||
337 | kfree(buffer.pointer); | |
338 | ||
339 | return AE_OK; | |
340 | } | |
341 | #endif | |
342 | ||
343 | acpi_status | |
344 | acpi_evaluate_reference(acpi_handle handle, | |
345 | acpi_string pathname, | |
346 | struct acpi_object_list *arguments, | |
347 | struct acpi_handle_list *list) | |
348 | { | |
349 | acpi_status status = AE_OK; | |
350 | union acpi_object *package = NULL; | |
351 | union acpi_object *element = NULL; | |
352 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
353 | u32 i = 0; | |
354 | ||
355 | ||
356 | if (!list) { | |
357 | return AE_BAD_PARAMETER; | |
358 | } | |
359 | ||
360 | /* Evaluate object. */ | |
361 | ||
362 | status = acpi_evaluate_object(handle, pathname, arguments, &buffer); | |
363 | if (ACPI_FAILURE(status)) | |
364 | goto end; | |
365 | ||
366 | package = buffer.pointer; | |
367 | ||
368 | if ((buffer.length == 0) || !package) { | |
369 | printk(KERN_ERR PREFIX "No return object (len %X ptr %p)\n", | |
370 | (unsigned)buffer.length, package); | |
371 | status = AE_BAD_DATA; | |
372 | acpi_util_eval_error(handle, pathname, status); | |
373 | goto end; | |
374 | } | |
375 | if (package->type != ACPI_TYPE_PACKAGE) { | |
376 | printk(KERN_ERR PREFIX "Expecting a [Package], found type %X\n", | |
377 | package->type); | |
378 | status = AE_BAD_DATA; | |
379 | acpi_util_eval_error(handle, pathname, status); | |
380 | goto end; | |
381 | } | |
382 | if (!package->package.count) { | |
383 | printk(KERN_ERR PREFIX "[Package] has zero elements (%p)\n", | |
384 | package); | |
385 | status = AE_BAD_DATA; | |
386 | acpi_util_eval_error(handle, pathname, status); | |
387 | goto end; | |
388 | } | |
389 | ||
390 | if (package->package.count > ACPI_MAX_HANDLES) { | |
391 | return AE_NO_MEMORY; | |
392 | } | |
393 | list->count = package->package.count; | |
394 | ||
395 | /* Extract package data. */ | |
396 | ||
397 | for (i = 0; i < list->count; i++) { | |
398 | ||
399 | element = &(package->package.elements[i]); | |
400 | ||
401 | if (element->type != ACPI_TYPE_LOCAL_REFERENCE) { | |
402 | status = AE_BAD_DATA; | |
403 | printk(KERN_ERR PREFIX | |
404 | "Expecting a [Reference] package element, found type %X\n", | |
405 | element->type); | |
406 | acpi_util_eval_error(handle, pathname, status); | |
407 | break; | |
408 | } | |
409 | ||
410 | if (!element->reference.handle) { | |
411 | printk(KERN_WARNING PREFIX "Invalid reference in" | |
412 | " package %s\n", pathname); | |
413 | status = AE_NULL_ENTRY; | |
414 | break; | |
415 | } | |
416 | /* Get the acpi_handle. */ | |
417 | ||
418 | list->handles[i] = element->reference.handle; | |
419 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found reference [%p]\n", | |
420 | list->handles[i])); | |
421 | } | |
422 | ||
423 | end: | |
424 | if (ACPI_FAILURE(status)) { | |
425 | list->count = 0; | |
426 | //kfree(list->handles); | |
427 | } | |
428 | ||
429 | kfree(buffer.pointer); | |
430 | ||
431 | return status; | |
432 | } | |
433 | ||
434 | EXPORT_SYMBOL(acpi_evaluate_reference); |