Merge branch 'upstream-fixes'
[linux-2.6] / drivers / acpi / utils.c
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("acpi_utils")
35
36 /* --------------------------------------------------------------------------
37                             Object Evaluation Helpers
38    -------------------------------------------------------------------------- */
39 #ifdef ACPI_DEBUG_OUTPUT
40 #define acpi_util_eval_error(h,p,s) {\
41         char prefix[80] = {'\0'};\
42         struct acpi_buffer buffer = {sizeof(prefix), prefix};\
43         acpi_get_name(h, ACPI_FULL_PATHNAME, &buffer);\
44         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Evaluate [%s.%s]: %s\n",\
45                 (char *) prefix, p, acpi_format_exception(s))); }
46 #else
47 #define acpi_util_eval_error(h,p,s)
48 #endif
49 acpi_status
50 acpi_extract_package(union acpi_object *package,
51                      struct acpi_buffer *format, struct acpi_buffer *buffer)
52 {
53         u32 size_required = 0;
54         u32 tail_offset = 0;
55         char *format_string = NULL;
56         u32 format_count = 0;
57         u32 i = 0;
58         u8 *head = NULL;
59         u8 *tail = NULL;
60
61         ACPI_FUNCTION_TRACE("acpi_extract_package");
62
63         if (!package || (package->type != ACPI_TYPE_PACKAGE)
64             || (package->package.count < 1)) {
65                 ACPI_DEBUG_PRINT((ACPI_DB_WARN,
66                                   "Invalid 'package' argument\n"));
67                 return_ACPI_STATUS(AE_BAD_PARAMETER);
68         }
69
70         if (!format || !format->pointer || (format->length < 1)) {
71                 ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Invalid 'format' argument\n"));
72                 return_ACPI_STATUS(AE_BAD_PARAMETER);
73         }
74
75         if (!buffer) {
76                 ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Invalid 'buffer' argument\n"));
77                 return_ACPI_STATUS(AE_BAD_PARAMETER);
78         }
79
80         format_count = (format->length / sizeof(char)) - 1;
81         if (format_count > package->package.count) {
82                 ACPI_DEBUG_PRINT((ACPI_DB_WARN,
83                                   "Format specifies more objects [%d] than exist in package [%d].",
84                                   format_count, package->package.count));
85                 return_ACPI_STATUS(AE_BAD_DATA);
86         }
87
88         format_string = (char *)format->pointer;
89
90         /*
91          * Calculate size_required.
92          */
93         for (i = 0; i < format_count; i++) {
94
95                 union acpi_object *element = &(package->package.elements[i]);
96
97                 if (!element) {
98                         return_ACPI_STATUS(AE_BAD_DATA);
99                 }
100
101                 switch (element->type) {
102
103                 case ACPI_TYPE_INTEGER:
104                         switch (format_string[i]) {
105                         case 'N':
106                                 size_required += sizeof(acpi_integer);
107                                 tail_offset += sizeof(acpi_integer);
108                                 break;
109                         case 'S':
110                                 size_required +=
111                                     sizeof(char *) + sizeof(acpi_integer) +
112                                     sizeof(char);
113                                 tail_offset += sizeof(char *);
114                                 break;
115                         default:
116                                 ACPI_DEBUG_PRINT((ACPI_DB_WARN,
117                                                   "Invalid package element [%d]: got number, expecing [%c].\n",
118                                                   i, format_string[i]));
119                                 return_ACPI_STATUS(AE_BAD_DATA);
120                                 break;
121                         }
122                         break;
123
124                 case ACPI_TYPE_STRING:
125                 case ACPI_TYPE_BUFFER:
126                         switch (format_string[i]) {
127                         case 'S':
128                                 size_required +=
129                                     sizeof(char *) +
130                                     (element->string.length * sizeof(char)) +
131                                     sizeof(char);
132                                 tail_offset += sizeof(char *);
133                                 break;
134                         case 'B':
135                                 size_required +=
136                                     sizeof(u8 *) +
137                                     (element->buffer.length * sizeof(u8));
138                                 tail_offset += sizeof(u8 *);
139                                 break;
140                         default:
141                                 ACPI_DEBUG_PRINT((ACPI_DB_WARN,
142                                                   "Invalid package element [%d] got string/buffer, expecing [%c].\n",
143                                                   i, format_string[i]));
144                                 return_ACPI_STATUS(AE_BAD_DATA);
145                                 break;
146                         }
147                         break;
148
149                 case ACPI_TYPE_PACKAGE:
150                 default:
151                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
152                                           "Found unsupported element at index=%d\n",
153                                           i));
154                         /* TBD: handle nested packages... */
155                         return_ACPI_STATUS(AE_SUPPORT);
156                         break;
157                 }
158         }
159
160         /*
161          * Validate output buffer.
162          */
163         if (buffer->length < size_required) {
164                 buffer->length = size_required;
165                 return_ACPI_STATUS(AE_BUFFER_OVERFLOW);
166         } else if (buffer->length != size_required || !buffer->pointer) {
167                 return_ACPI_STATUS(AE_BAD_PARAMETER);
168         }
169
170         head = buffer->pointer;
171         tail = buffer->pointer + tail_offset;
172
173         /*
174          * Extract package data.
175          */
176         for (i = 0; i < format_count; i++) {
177
178                 u8 **pointer = NULL;
179                 union acpi_object *element = &(package->package.elements[i]);
180
181                 if (!element) {
182                         return_ACPI_STATUS(AE_BAD_DATA);
183                 }
184
185                 switch (element->type) {
186
187                 case ACPI_TYPE_INTEGER:
188                         switch (format_string[i]) {
189                         case 'N':
190                                 *((acpi_integer *) head) =
191                                     element->integer.value;
192                                 head += sizeof(acpi_integer);
193                                 break;
194                         case 'S':
195                                 pointer = (u8 **) head;
196                                 *pointer = tail;
197                                 *((acpi_integer *) tail) =
198                                     element->integer.value;
199                                 head += sizeof(acpi_integer *);
200                                 tail += sizeof(acpi_integer);
201                                 /* NULL terminate string */
202                                 *tail = (char)0;
203                                 tail += sizeof(char);
204                                 break;
205                         default:
206                                 /* Should never get here */
207                                 break;
208                         }
209                         break;
210
211                 case ACPI_TYPE_STRING:
212                 case ACPI_TYPE_BUFFER:
213                         switch (format_string[i]) {
214                         case 'S':
215                                 pointer = (u8 **) head;
216                                 *pointer = tail;
217                                 memcpy(tail, element->string.pointer,
218                                        element->string.length);
219                                 head += sizeof(char *);
220                                 tail += element->string.length * sizeof(char);
221                                 /* NULL terminate string */
222                                 *tail = (char)0;
223                                 tail += sizeof(char);
224                                 break;
225                         case 'B':
226                                 pointer = (u8 **) head;
227                                 *pointer = tail;
228                                 memcpy(tail, element->buffer.pointer,
229                                        element->buffer.length);
230                                 head += sizeof(u8 *);
231                                 tail += element->buffer.length * sizeof(u8);
232                                 break;
233                         default:
234                                 /* Should never get here */
235                                 break;
236                         }
237                         break;
238
239                 case ACPI_TYPE_PACKAGE:
240                         /* TBD: handle nested packages... */
241                 default:
242                         /* Should never get here */
243                         break;
244                 }
245         }
246
247         return_ACPI_STATUS(AE_OK);
248 }
249
250 EXPORT_SYMBOL(acpi_extract_package);
251
252 acpi_status
253 acpi_evaluate_integer(acpi_handle handle,
254                       acpi_string pathname,
255                       struct acpi_object_list *arguments, unsigned long *data)
256 {
257         acpi_status status = AE_OK;
258         union acpi_object *element;
259         struct acpi_buffer buffer = { 0, NULL };
260
261         ACPI_FUNCTION_TRACE("acpi_evaluate_integer");
262
263         if (!data)
264                 return_ACPI_STATUS(AE_BAD_PARAMETER);
265
266         element = kmalloc(sizeof(union acpi_object), GFP_KERNEL);
267         if (!element)
268                 return_ACPI_STATUS(AE_NO_MEMORY);
269
270         memset(element, 0, sizeof(union acpi_object));
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_ACPI_STATUS(status);
277         }
278
279         if (element->type != ACPI_TYPE_INTEGER) {
280                 acpi_util_eval_error(handle, pathname, AE_BAD_DATA);
281                 return_ACPI_STATUS(AE_BAD_DATA);
282         }
283
284         *data = element->integer.value;
285         kfree(element);
286
287         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Return value [%lu]\n", *data));
288
289         return_ACPI_STATUS(AE_OK);
290 }
291
292 EXPORT_SYMBOL(acpi_evaluate_integer);
293
294 #if 0
295 acpi_status
296 acpi_evaluate_string(acpi_handle handle,
297                      acpi_string pathname,
298                      acpi_object_list * arguments, acpi_string * data)
299 {
300         acpi_status status = AE_OK;
301         acpi_object *element = NULL;
302         acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
303
304         ACPI_FUNCTION_TRACE("acpi_evaluate_string");
305
306         if (!data)
307                 return_ACPI_STATUS(AE_BAD_PARAMETER);
308
309         status = acpi_evaluate_object(handle, pathname, arguments, &buffer);
310         if (ACPI_FAILURE(status)) {
311                 acpi_util_eval_error(handle, pathname, status);
312                 return_ACPI_STATUS(status);
313         }
314
315         element = (acpi_object *) buffer.pointer;
316
317         if ((element->type != ACPI_TYPE_STRING)
318             || (element->type != ACPI_TYPE_BUFFER)
319             || !element->string.length) {
320                 acpi_util_eval_error(handle, pathname, AE_BAD_DATA);
321                 return_ACPI_STATUS(AE_BAD_DATA);
322         }
323
324         *data = kmalloc(element->string.length + 1, GFP_KERNEL);
325         if (!data) {
326                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Memory allocation error\n"));
327                 return_VALUE(-ENOMEM);
328         }
329         memset(*data, 0, element->string.length + 1);
330
331         memcpy(*data, element->string.pointer, element->string.length);
332
333         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Return value [%s]\n", *data));
334
335         acpi_os_free(buffer.pointer);
336
337         return_ACPI_STATUS(AE_OK);
338 }
339 #endif
340
341 acpi_status
342 acpi_evaluate_reference(acpi_handle handle,
343                         acpi_string pathname,
344                         struct acpi_object_list *arguments,
345                         struct acpi_handle_list *list)
346 {
347         acpi_status status = AE_OK;
348         union acpi_object *package = NULL;
349         union acpi_object *element = NULL;
350         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
351         u32 i = 0;
352
353         ACPI_FUNCTION_TRACE("acpi_evaluate_reference");
354
355         if (!list) {
356                 return_ACPI_STATUS(AE_BAD_PARAMETER);
357         }
358
359         /* Evaluate object. */
360
361         status = acpi_evaluate_object(handle, pathname, arguments, &buffer);
362         if (ACPI_FAILURE(status))
363                 goto end;
364
365         package = (union acpi_object *)buffer.pointer;
366
367         if ((buffer.length == 0) || !package) {
368                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
369                                   "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                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
377                                   "Expecting a [Package], found type %X\n",
378                                   package->type));
379                 status = AE_BAD_DATA;
380                 acpi_util_eval_error(handle, pathname, status);
381                 goto end;
382         }
383         if (!package->package.count) {
384                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
385                                   "[Package] has zero elements (%p)\n",
386                                   package));
387                 status = AE_BAD_DATA;
388                 acpi_util_eval_error(handle, pathname, status);
389                 goto end;
390         }
391
392         if (package->package.count > ACPI_MAX_HANDLES) {
393                 return_ACPI_STATUS(AE_NO_MEMORY);
394         }
395         list->count = package->package.count;
396
397         /* Extract package data. */
398
399         for (i = 0; i < list->count; i++) {
400
401                 element = &(package->package.elements[i]);
402
403                 if (element->type != ACPI_TYPE_ANY) {
404                         status = AE_BAD_DATA;
405                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
406                                           "Expecting a [Reference] package element, found type %X\n",
407                                           element->type));
408                         acpi_util_eval_error(handle, pathname, status);
409                         break;
410                 }
411
412                 /* Get the  acpi_handle. */
413
414                 list->handles[i] = element->reference.handle;
415                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found reference [%p]\n",
416                                   list->handles[i]));
417         }
418
419       end:
420         if (ACPI_FAILURE(status)) {
421                 list->count = 0;
422                 //kfree(list->handles);
423         }
424
425         acpi_os_free(buffer.pointer);
426
427         return_ACPI_STATUS(status);
428 }
429
430 EXPORT_SYMBOL(acpi_evaluate_reference);