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
  62         if (!package || (package->type != ACPI_TYPE_PACKAGE)
  63             || (package->package.count < 1)) {
  64                 printk(KERN_WARNING PREFIX "Invalid package argument\n");
  65                 return AE_BAD_PARAMETER;
  66         }
  67
  68         if (!format || !format->pointer || (format->length < 1)) {
  69                 printk(KERN_WARNING PREFIX "Invalid format argument\n");
  70                 return AE_BAD_PARAMETER;
  71         }
  72
  73         if (!buffer) {
  74                 printk(KERN_WARNING PREFIX "Invalid buffer argument\n");
  75                 return AE_BAD_PARAMETER;
  76         }
  77
  78         format_count = (format->length / sizeof(char)) - 1;
  79         if (format_count > package->package.count) {
  80                 printk(KERN_WARNING PREFIX "Format specifies more objects [%d]"
  81                               " than exist in package [%d].\n",
  82                               format_count, package->package.count);
  83                 return AE_BAD_DATA;
  84         }
  85
  86         format_string = format->pointer;
  87
  88         /*
  89          * Calculate size_required.
  90          */
  91         for (i = 0; i < format_count; i++) {
  92
  93                 union acpi_object *element = &(package->package.elements[i]);
  94
  95                 if (!element) {
  96                         return AE_BAD_DATA;
  97                 }
  98
  99                 switch (element->type) {
 100
 101                 case ACPI_TYPE_INTEGER:
 102                         switch (format_string[i]) {
 103                         case 'N':
 104                                 size_required += sizeof(acpi_integer);
 105                                 tail_offset += sizeof(acpi_integer);
 106                                 break;
 107                         case 'S':
 108                                 size_required +=
 109                                     sizeof(char *) + sizeof(acpi_integer) +
 110                                     sizeof(char);
 111                                 tail_offset += sizeof(char *);
 112                                 break;
 113                         default:
 114                                 printk(KERN_WARNING PREFIX "Invalid package element"
 115                                               " [%d]: got number, expecing"
 116                                               " [%c]\n",
 117                                               i, format_string[i]);
 118                                 return 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 +=
 128                                     sizeof(char *) +
 129                                     (element->string.length * sizeof(char)) +
 130                                     sizeof(char);
 131                                 tail_offset += sizeof(char *);
 132                                 break;
 133                         case 'B':
 134                                 size_required +=
 135                                     sizeof(u8 *) +
 136                                     (element->buffer.length * sizeof(u8));
 137                                 tail_offset += sizeof(u8 *);
 138                                 break;
 139                         default:
 140                                 printk(KERN_WARNING PREFIX "Invalid package element"
 141                                               " [%d] got string/buffer,"
 142                                               " expecing [%c]\n",
 143                                               i, format_string[i]);
 144                                 return 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 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 AE_BUFFER_OVERFLOW;
 166         } else if (buffer->length != size_required || !buffer->pointer) {
 167                 return 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 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 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
 262         if (!data)
 263                 return AE_BAD_PARAMETER;
 264
 265         element = kzalloc(sizeof(union acpi_object), irqs_disabled() ? GFP_ATOMIC: GFP_KERNEL);
 266         if (!element)
 267                 return AE_NO_MEMORY;
 268
 269         buffer.length = sizeof(union acpi_object);
 270         buffer.pointer = element;
 271         status = acpi_evaluate_object(handle, pathname, arguments, &buffer);
 272         if (ACPI_FAILURE(status)) {
 273                 acpi_util_eval_error(handle, pathname, status);
 274                 kfree(element);
 275                 return status;
 276         }
 277
 278         if (element->type != ACPI_TYPE_INTEGER) {
 279                 acpi_util_eval_error(handle, pathname, AE_BAD_DATA);
 280                 kfree(element);
 281                 return 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 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
 305         if (!data)
 306                 return AE_BAD_PARAMETER;
 307
 308         status = acpi_evaluate_object(handle, pathname, arguments, &buffer);
 309         if (ACPI_FAILURE(status)) {
 310                 acpi_util_eval_error(handle, pathname, status);
 311                 return status;
 312         }
 313
 314         element = (acpi_object *) buffer.pointer;
 315
 316         if ((element->type != ACPI_TYPE_STRING)
 317             || (element->type != ACPI_TYPE_BUFFER)
 318             || !element->string.length) {
 319                 acpi_util_eval_error(handle, pathname, AE_BAD_DATA);
 320                 return AE_BAD_DATA;
 321         }
 322
 323         *data = kzalloc(element->string.length + 1, GFP_KERNEL);
 324         if (!data) {
 325                 printk(KERN_ERR PREFIX "Memory allocation\n");
 326                 return -ENOMEM;
 327         }
 328
 329         memcpy(*data, element->string.pointer, element->string.length);
 330
 331         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Return value [%s]\n", *data));
 332
 333         kfree(buffer.pointer);
 334
 335         return AE_OK;
 336 }
 337 #endif
 338
 339 acpi_status
 340 acpi_evaluate_reference(acpi_handle handle,
 341                         acpi_string pathname,
 342                         struct acpi_object_list *arguments,
 343                         struct acpi_handle_list *list)
 344 {
 345         acpi_status status = AE_OK;
 346         union acpi_object *package = NULL;
 347         union acpi_object *element = NULL;
 348         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 349         u32 i = 0;
 350
 351
 352         if (!list) {
 353                 return AE_BAD_PARAMETER;
 354         }
 355
 356         /* Evaluate object. */
 357
 358         status = acpi_evaluate_object(handle, pathname, arguments, &buffer);
 359         if (ACPI_FAILURE(status))
 360                 goto end;
 361
 362         package = buffer.pointer;
 363
 364         if ((buffer.length == 0) || !package) {
 365                 printk(KERN_ERR PREFIX "No return object (len %X ptr %p)\n",
 366                             (unsigned)buffer.length, package);
 367                 status = AE_BAD_DATA;
 368                 acpi_util_eval_error(handle, pathname, status);
 369                 goto end;
 370         }
 371         if (package->type != ACPI_TYPE_PACKAGE) {
 372                 printk(KERN_ERR PREFIX "Expecting a [Package], found type %X\n",
 373                             package->type);
 374                 status = AE_BAD_DATA;
 375                 acpi_util_eval_error(handle, pathname, status);
 376                 goto end;
 377         }
 378         if (!package->package.count) {
 379                 printk(KERN_ERR PREFIX "[Package] has zero elements (%p)\n",
 380                             package);
 381                 status = AE_BAD_DATA;
 382                 acpi_util_eval_error(handle, pathname, status);
 383                 goto end;
 384         }
 385
 386         if (package->package.count > ACPI_MAX_HANDLES) {
 387                 return AE_NO_MEMORY;
 388         }
 389         list->count = package->package.count;
 390
 391         /* Extract package data. */
 392
 393         for (i = 0; i < list->count; i++) {
 394
 395                 element = &(package->package.elements[i]);
 396
 397                 if (element->type != ACPI_TYPE_ANY) {
 398                         status = AE_BAD_DATA;
 399                         printk(KERN_ERR PREFIX
 400                                     "Expecting a [Reference] package element, found type %X\n",
 401                                     element->type);
 402                         acpi_util_eval_error(handle, pathname, status);
 403                         break;
 404                 }
 405
 406                 /* Get the  acpi_handle. */
 407
 408                 list->handles[i] = element->reference.handle;
 409                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found reference [%p]\n",
 410                                   list->handles[i]));
 411         }
 412
 413       end:
 414         if (ACPI_FAILURE(status)) {
 415                 list->count = 0;
 416                 //kfree(list->handles);
 417         }
 418
 419         kfree(buffer.pointer);
 420
 421         return status;
 422 }
 423
 424 EXPORT_SYMBOL(acpi_evaluate_reference);