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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
35ACPI_MODULE_NAME ("acpi_utils")
36
37
38
39
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
54acpi_status
55acpi_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
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
145 return_ACPI_STATUS(AE_SUPPORT);
146 break;
147 }
148 }
149
150
151
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
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
191 *tail = (char)0;
192 tail += sizeof(char);
193 break;
194 default:
195
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
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
222 break;
223 }
224 break;
225
226 case ACPI_TYPE_PACKAGE:
227
228 default:
229
230 break;
231 }
232 }
233
234 return_ACPI_STATUS(AE_OK);
235}
236
237
238acpi_status
239acpi_evaluate_integer (
240 acpi_handle handle,
241 acpi_string pathname,
242 struct acpi_object_list *arguments,
243 unsigned long *data)
244{
245 acpi_status status = AE_OK;
246 union acpi_object element;
247 struct acpi_buffer buffer = {sizeof(union acpi_object), &element};
248
249 ACPI_FUNCTION_TRACE("acpi_evaluate_integer");
250
251 if (!data)
252 return_ACPI_STATUS(AE_BAD_PARAMETER);
253
254 status = acpi_evaluate_object(handle, pathname, arguments, &buffer);
255 if (ACPI_FAILURE(status)) {
256 acpi_util_eval_error(handle, pathname, status);
257 return_ACPI_STATUS(status);
258 }
259
260 if (element.type != ACPI_TYPE_INTEGER) {
261 acpi_util_eval_error(handle, pathname, AE_BAD_DATA);
262 return_ACPI_STATUS(AE_BAD_DATA);
263 }
264
265 *data = element.integer.value;
266
267 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Return value [%lu]\n", *data));
268
269 return_ACPI_STATUS(AE_OK);
270}
271
272
273#if 0
274acpi_status
275acpi_evaluate_string (
276 acpi_handle handle,
277 acpi_string pathname,
278 acpi_object_list *arguments,
279 acpi_string *data)
280{
281 acpi_status status = AE_OK;
282 acpi_object *element = NULL;
283 acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
284
285 ACPI_FUNCTION_TRACE("acpi_evaluate_string");
286
287 if (!data)
288 return_ACPI_STATUS(AE_BAD_PARAMETER);
289
290 status = acpi_evaluate_object(handle, pathname, arguments, &buffer);
291 if (ACPI_FAILURE(status)) {
292 acpi_util_eval_error(handle, pathname, status);
293 return_ACPI_STATUS(status);
294 }
295
296 element = (acpi_object *) buffer.pointer;
297
298 if ((element->type != ACPI_TYPE_STRING)
299 || (element->type != ACPI_TYPE_BUFFER)
300 || !element->string.length) {
301 acpi_util_eval_error(handle, pathname, AE_BAD_DATA);
302 return_ACPI_STATUS(AE_BAD_DATA);
303 }
304
305 *data = kmalloc(element->string.length + 1, GFP_KERNEL);
306 if (!data) {
307 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Memory allocation error\n"));
308 return_VALUE(-ENOMEM);
309 }
310 memset(*data, 0, element->string.length + 1);
311
312 memcpy(*data, element->string.pointer, element->string.length);
313
314 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Return value [%s]\n", *data));
315
316 acpi_os_free(buffer.pointer);
317
318 return_ACPI_STATUS(AE_OK);
319}
320#endif
321
322
323acpi_status
324acpi_evaluate_reference (
325 acpi_handle handle,
326 acpi_string pathname,
327 struct acpi_object_list *arguments,
328 struct acpi_handle_list *list)
329{
330 acpi_status status = AE_OK;
331 union acpi_object *package = NULL;
332 union acpi_object *element = NULL;
333 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
334 u32 i = 0;
335
336 ACPI_FUNCTION_TRACE("acpi_evaluate_reference");
337
338 if (!list) {
339 return_ACPI_STATUS(AE_BAD_PARAMETER);
340 }
341
342
343
344 status = acpi_evaluate_object(handle, pathname, arguments, &buffer);
345 if (ACPI_FAILURE(status))
346 goto end;
347
348 package = (union acpi_object *) buffer.pointer;
349
350 if ((buffer.length == 0) || !package) {
351 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
352 "No return object (len %X ptr %p)\n",
353 buffer.length, package));
354 status = AE_BAD_DATA;
355 acpi_util_eval_error(handle, pathname, status);
356 goto end;
357 }
358 if (package->type != ACPI_TYPE_PACKAGE) {
359 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
360 "Expecting a [Package], found type %X\n",
361 package->type));
362 status = AE_BAD_DATA;
363 acpi_util_eval_error(handle, pathname, status);
364 goto end;
365 }
366 if (!package->package.count) {
367 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
368 "[Package] has zero elements (%p)\n",
369 package));
370 status = AE_BAD_DATA;
371 acpi_util_eval_error(handle, pathname, status);
372 goto end;
373 }
374
375 if (package->package.count > ACPI_MAX_HANDLES) {
376 return AE_NO_MEMORY;
377 }
378 list->count = package->package.count;
379
380
381
382 for (i = 0; i < list->count; i++) {
383
384 element = &(package->package.elements[i]);
385
386 if (element->type != ACPI_TYPE_ANY) {
387 status = AE_BAD_DATA;
388 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
389 "Expecting a [Reference] package element, found type %X\n",
390 element->type));
391 acpi_util_eval_error(handle, pathname, status);
392 break;
393 }
394
395
396
397 list->handles[i] = element->reference.handle;
398 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found reference [%p]\n",
399 list->handles[i]));
400 }
401
402end:
403 if (ACPI_FAILURE(status)) {
404 list->count = 0;
405
406 }
407
408 acpi_os_free(buffer.pointer);
409
410 return_ACPI_STATUS(status);
411}
412
413
414
