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("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 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
 288 EXPORT_SYMBOL(acpi_evaluate_integer);
 289
 290 #if 0
 291 acpi_status
 292 acpi_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
 335 acpi_status
 336 acpi_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         /* Evaluate object. */
 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         /* Extract package data. */
 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                 /* Get the  acpi_handle. */
 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                 //kfree(list->handles);
 419         }
 420
 421         kfree(buffer.pointer);
 422
 423         return status;
 424 }
 425
 426 EXPORT_SYMBOL(acpi_evaluate_reference);