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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#define _COMPONENT ACPI_BUS_COMPONENT
34ACPI_MODULE_NAME("utils");
35
36
37
38
39static void
40acpi_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
53acpi_status
54acpi_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
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
159 return AE_SUPPORT;
160 break;
161 }
162 }
163
164
165
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
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
206 *tail = (char)0;
207 tail += sizeof(char);
208 break;
209 default:
210
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
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
239 break;
240 }
241 break;
242
243 case ACPI_TYPE_PACKAGE:
244
245 default:
246
247 break;
248 }
249 }
250
251 return AE_OK;
252}
253
254EXPORT_SYMBOL(acpi_extract_package);
255
256acpi_status
257acpi_evaluate_integer(acpi_handle handle,
258 acpi_string pathname,
259 struct acpi_object_list *arguments, unsigned long long *data)
260{
261 acpi_status status = AE_OK;
262 union acpi_object element;
263 struct acpi_buffer buffer = { 0, NULL };
264
265 if (!data)
266 return AE_BAD_PARAMETER;
267
268 buffer.length = sizeof(union acpi_object);
269 buffer.pointer = &element;
270 status = acpi_evaluate_object(handle, pathname, arguments, &buffer);
271 if (ACPI_FAILURE(status)) {
272 acpi_util_eval_error(handle, pathname, status);
273 return status;
274 }
275
276 if (element.type != ACPI_TYPE_INTEGER) {
277 acpi_util_eval_error(handle, pathname, AE_BAD_DATA);
278 return AE_BAD_DATA;
279 }
280
281 *data = element.integer.value;
282
283 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Return value [%llu]\n", *data));
284
285 return AE_OK;
286}
287
288EXPORT_SYMBOL(acpi_evaluate_integer);
289
290#if 0
291acpi_status
292acpi_evaluate_string(acpi_handle handle,
293 acpi_string pathname,
294 acpi_object_list * arguments, acpi_string * data)
295{
296 acpi_status status = AE_OK;
297 acpi_object *element = NULL;
298 acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
299
300
301 if (!data)
302 return AE_BAD_PARAMETER;
303
304 status = acpi_evaluate_object(handle, pathname, arguments, &buffer);
305 if (ACPI_FAILURE(status)) {
306 acpi_util_eval_error(handle, pathname, status);
307 return status;
308 }
309
310 element = (acpi_object *) buffer.pointer;
311
312 if ((element->type != ACPI_TYPE_STRING)
313 || (element->type != ACPI_TYPE_BUFFER)
314 || !element->string.length) {
315 acpi_util_eval_error(handle, pathname, AE_BAD_DATA);
316 return AE_BAD_DATA;
317 }
318
319 *data = kzalloc(element->string.length + 1, GFP_KERNEL);
320 if (!data) {
321 printk(KERN_ERR PREFIX "Memory allocation\n");
322 return -ENOMEM;
323 }
324
325 memcpy(*data, element->string.pointer, element->string.length);
326
327 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Return value [%s]\n", *data));
328
329 kfree(buffer.pointer);
330
331 return AE_OK;
332}
333#endif
334
335acpi_status
336acpi_evaluate_reference(acpi_handle handle,
337 acpi_string pathname,
338 struct acpi_object_list *arguments,
339 struct acpi_handle_list *list)
340{
341 acpi_status status = AE_OK;
342 union acpi_object *package = NULL;
343 union acpi_object *element = NULL;
344 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
345 u32 i = 0;
346
347
348 if (!list) {
349 return AE_BAD_PARAMETER;
350 }
351
352
353
354 status = acpi_evaluate_object(handle, pathname, arguments, &buffer);
355 if (ACPI_FAILURE(status))
356 goto end;
357
358 package = buffer.pointer;
359
360 if ((buffer.length == 0) || !package) {
361 printk(KERN_ERR PREFIX "No return object (len %X ptr %p)\n",
362 (unsigned)buffer.length, package);
363 status = AE_BAD_DATA;
364 acpi_util_eval_error(handle, pathname, status);
365 goto end;
366 }
367 if (package->type != ACPI_TYPE_PACKAGE) {
368 printk(KERN_ERR PREFIX "Expecting a [Package], found type %X\n",
369 package->type);
370 status = AE_BAD_DATA;
371 acpi_util_eval_error(handle, pathname, status);
372 goto end;
373 }
374 if (!package->package.count) {
375 printk(KERN_ERR PREFIX "[Package] has zero elements (%p)\n",
376 package);
377 status = AE_BAD_DATA;
378 acpi_util_eval_error(handle, pathname, status);
379 goto end;
380 }
381
382 if (package->package.count > ACPI_MAX_HANDLES) {
383 return AE_NO_MEMORY;
384 }
385 list->count = package->package.count;
386
387
388
389 for (i = 0; i < list->count; i++) {
390
391 element = &(package->package.elements[i]);
392
393 if (element->type != ACPI_TYPE_LOCAL_REFERENCE) {
394 status = AE_BAD_DATA;
395 printk(KERN_ERR PREFIX
396 "Expecting a [Reference] package element, found type %X\n",
397 element->type);
398 acpi_util_eval_error(handle, pathname, status);
399 break;
400 }
401
402 if (!element->reference.handle) {
403 printk(KERN_WARNING PREFIX "Invalid reference in"
404 " package %s\n", pathname);
405 status = AE_NULL_ENTRY;
406 break;
407 }
408
409
410 list->handles[i] = element->reference.handle;
411 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found reference [%p]\n",
412 list->handles[i]));
413 }
414
415 end:
416 if (ACPI_FAILURE(status)) {
417 list->count = 0;
418
419 }
420
421 kfree(buffer.pointer);
422
423 return status;
424}
425
426EXPORT_SYMBOL(acpi_evaluate_reference);
427
