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/slab.h>
  29 #include <linux/init.h>
  30 #include <linux/types.h>
  31 #include <acpi/acpi_bus.h>
  32 #include <acpi/acpi_drivers.h>
  33
  34 #include "internal.h"
  35
  36 #define _COMPONENT              ACPI_BUS_COMPONENT
  37 ACPI_MODULE_NAME("utils");
  38
  39 /* --------------------------------------------------------------------------
  40                             Object Evaluation Helpers
  41    -------------------------------------------------------------------------- */
  42 static void
  43 acpi_util_eval_error(acpi_handle h, acpi_string p, acpi_status s)
  44 {
  45 #ifdef ACPI_DEBUG_OUTPUT
  46         char prefix[80] = {'\0'};
  47         struct acpi_buffer buffer = {sizeof(prefix), prefix};
  48         acpi_get_name(h, ACPI_FULL_PATHNAME, &buffer);
  49         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Evaluate [%s.%s]: %s\n",
  50                 (char *) prefix, p, acpi_format_exception(s)));
  51 #else
  52         return;
  53 #endif
  54 }
  55
  56 acpi_status
  57 acpi_extract_package(union acpi_object *package,
  58                      struct acpi_buffer *format, 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
  69         if (!package || (package->type != ACPI_TYPE_PACKAGE)
  70             || (package->package.count < 1)) {
  71                 printk(KERN_WARNING PREFIX "Invalid package argument\n");
  72                 return AE_BAD_PARAMETER;
  73         }
  74
  75         if (!format || !format->pointer || (format->length < 1)) {
  76                 printk(KERN_WARNING PREFIX "Invalid format argument\n");
  77                 return AE_BAD_PARAMETER;
  78         }
  79
  80         if (!buffer) {
  81                 printk(KERN_WARNING PREFIX "Invalid buffer argument\n");
  82                 return AE_BAD_PARAMETER;
  83         }
  84
  85         format_count = (format->length / sizeof(char)) - 1;
  86         if (format_count > package->package.count) {
  87                 printk(KERN_WARNING PREFIX "Format specifies more objects [%d]"
  88                               " than exist in package [%d].\n",
  89                               format_count, package->package.count);
  90                 return AE_BAD_DATA;
  91         }
  92
  93         format_string = format->pointer;
  94
  95         /*
  96          * Calculate size_required.
  97          */
  98         for (i = 0; i < format_count; i++) {
  99
 100                 union acpi_object *element = &(package->package.elements[i]);
 101
 102                 if (!element) {
 103                         return AE_BAD_DATA;
 104                 }
 105
 106                 switch (element->type) {
 107
 108                 case ACPI_TYPE_INTEGER:
 109                         switch (format_string[i]) {
 110                         case 'N':
 111                                 size_required += sizeof(u64);
 112                                 tail_offset += sizeof(u64);
 113                                 break;
 114                         case 'S':
 115                                 size_required +=
 116                                     sizeof(char *) + sizeof(u64) +
 117                                     sizeof(char);
 118                                 tail_offset += sizeof(char *);
 119                                 break;
 120                         default:
 121                                 printk(KERN_WARNING PREFIX "Invalid package element"
 122                                               " [%d]: got number, expecing"
 123                                               " [%c]\n",
 124                                               i, format_string[i]);
 125                                 return AE_BAD_DATA;
 126                                 break;
 127                         }
 128                         break;
 129
 130                 case ACPI_TYPE_STRING:
 131                 case ACPI_TYPE_BUFFER:
 132                         switch (format_string[i]) {
 133                         case 'S':
 134                                 size_required +=
 135                                     sizeof(char *) +
 136                                     (element->string.length * sizeof(char)) +
 137                                     sizeof(char);
 138                                 tail_offset += sizeof(char *);
 139                                 break;
 140                         case 'B':
 141                                 size_required +=
 142                                     sizeof(u8 *) +
 143                                     (element->buffer.length * sizeof(u8));
 144                                 tail_offset += sizeof(u8 *);
 145                                 break;
 146                         default:
 147                                 printk(KERN_WARNING PREFIX "Invalid package element"
 148                                               " [%d] got string/buffer,"
 149                                               " expecing [%c]\n",
 150                                               i, format_string[i]);
 151                                 return AE_BAD_DATA;
 152                                 break;
 153                         }
 154                         break;
 155
 156                 case ACPI_TYPE_PACKAGE:
 157                 default:
 158                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 159                                           "Found unsupported element at index=%d\n",
 160                                           i));
 161                         /* TBD: handle nested packages... */
 162                         return AE_SUPPORT;
 163                         break;
 164                 }
 165         }
 166
 167         /*
 168          * Validate output buffer.
 169          */
 170         if (buffer->length < size_required) {
 171                 buffer->length = size_required;
 172                 return AE_BUFFER_OVERFLOW;
 173         } else if (buffer->length != size_required || !buffer->pointer) {
 174                 return AE_BAD_PARAMETER;
 175         }
 176
 177         head = buffer->pointer;
 178         tail = buffer->pointer + tail_offset;
 179
 180         /*
 181          * Extract package data.
 182          */
 183         for (i = 0; i < format_count; i++) {
 184
 185                 u8 **pointer = NULL;
 186                 union acpi_object *element = &(package->package.elements[i]);
 187
 188                 if (!element) {
 189                         return AE_BAD_DATA;
 190                 }
 191
 192                 switch (element->type) {
 193
 194                 case ACPI_TYPE_INTEGER:
 195                         switch (format_string[i]) {
 196                         case 'N':
 197                                 *((u64 *) head) =
 198                                     element->integer.value;
 199                                 head += sizeof(u64);
 200                                 break;
 201                         case 'S':
 202                                 pointer = (u8 **) head;
 203                                 *pointer = tail;
 204                                 *((u64 *) tail) =
 205                                     element->integer.value;
 206                                 head += sizeof(u64 *);
 207                                 tail += sizeof(u64);
 208                                 /* NULL terminate string */
 209                                 *tail = (char)0;
 210                                 tail += sizeof(char);
 211                                 break;
 212                         default:
 213                                 /* Should never get here */
 214                                 break;
 215                         }
 216                         break;
 217
 218                 case ACPI_TYPE_STRING:
 219                 case ACPI_TYPE_BUFFER:
 220                         switch (format_string[i]) {
 221                         case 'S':
 222                                 pointer = (u8 **) head;
 223                                 *pointer = tail;
 224                                 memcpy(tail, element->string.pointer,
 225                                        element->string.length);
 226                                 head += sizeof(char *);
 227                                 tail += element->string.length * sizeof(char);
 228                                 /* NULL terminate string */
 229                                 *tail = (char)0;
 230                                 tail += sizeof(char);
 231                                 break;
 232                         case 'B':
 233                                 pointer = (u8 **) head;
 234                                 *pointer = tail;
 235                                 memcpy(tail, element->buffer.pointer,
 236                                        element->buffer.length);
 237                                 head += sizeof(u8 *);
 238                                 tail += element->buffer.length * sizeof(u8);
 239                                 break;
 240                         default:
 241                                 /* Should never get here */
 242                                 break;
 243                         }
 244                         break;
 245
 246                 case ACPI_TYPE_PACKAGE:
 247                         /* TBD: handle nested packages... */
 248                 default:
 249                         /* Should never get here */
 250                         break;
 251                 }
 252         }
 253
 254         return AE_OK;
 255 }
 256
 257 EXPORT_SYMBOL(acpi_extract_package);
 258
 259 acpi_status
 260 acpi_evaluate_integer(acpi_handle handle,
 261                       acpi_string pathname,
 262                       struct acpi_object_list *arguments, unsigned long long *data)
 263 {
 264         acpi_status status = AE_OK;
 265         union acpi_object element;
 266         struct acpi_buffer buffer = { 0, NULL };
 267
 268         if (!data)
 269                 return AE_BAD_PARAMETER;
 270
 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 status;
 277         }
 278
 279         if (element.type != ACPI_TYPE_INTEGER) {
 280                 acpi_util_eval_error(handle, pathname, AE_BAD_DATA);
 281                 return AE_BAD_DATA;
 282         }
 283
 284         *data = element.integer.value;
 285
 286         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Return value [%llu]\n", *data));
 287
 288         return AE_OK;
 289 }
 290
 291 EXPORT_SYMBOL(acpi_evaluate_integer);
 292
 293 acpi_status
 294 acpi_evaluate_reference(acpi_handle handle,
 295                         acpi_string pathname,
 296                         struct acpi_object_list *arguments,
 297                         struct acpi_handle_list *list)
 298 {
 299         acpi_status status = AE_OK;
 300         union acpi_object *package = NULL;
 301         union acpi_object *element = NULL;
 302         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 303         u32 i = 0;
 304
 305
 306         if (!list) {
 307                 return AE_BAD_PARAMETER;
 308         }
 309
 310         /* Evaluate object. */
 311
 312         status = acpi_evaluate_object(handle, pathname, arguments, &buffer);
 313         if (ACPI_FAILURE(status))
 314                 goto end;
 315
 316         package = buffer.pointer;
 317
 318         if ((buffer.length == 0) || !package) {
 319                 printk(KERN_ERR PREFIX "No return object (len %X ptr %p)\n",
 320                             (unsigned)buffer.length, package);
 321                 status = AE_BAD_DATA;
 322                 acpi_util_eval_error(handle, pathname, status);
 323                 goto end;
 324         }
 325         if (package->type != ACPI_TYPE_PACKAGE) {
 326                 printk(KERN_ERR PREFIX "Expecting a [Package], found type %X\n",
 327                             package->type);
 328                 status = AE_BAD_DATA;
 329                 acpi_util_eval_error(handle, pathname, status);
 330                 goto end;
 331         }
 332         if (!package->package.count) {
 333                 printk(KERN_ERR PREFIX "[Package] has zero elements (%p)\n",
 334                             package);
 335                 status = AE_BAD_DATA;
 336                 acpi_util_eval_error(handle, pathname, status);
 337                 goto end;
 338         }
 339
 340         if (package->package.count > ACPI_MAX_HANDLES) {
 341                 return AE_NO_MEMORY;
 342         }
 343         list->count = package->package.count;
 344
 345         /* Extract package data. */
 346
 347         for (i = 0; i < list->count; i++) {
 348
 349                 element = &(package->package.elements[i]);
 350
 351                 if (element->type != ACPI_TYPE_LOCAL_REFERENCE) {
 352                         status = AE_BAD_DATA;
 353                         printk(KERN_ERR PREFIX
 354                                     "Expecting a [Reference] package element, found type %X\n",
 355                                     element->type);
 356                         acpi_util_eval_error(handle, pathname, status);
 357                         break;
 358                 }
 359
 360                 if (!element->reference.handle) {
 361                         printk(KERN_WARNING PREFIX "Invalid reference in"
 362                                " package %s\n", pathname);
 363                         status = AE_NULL_ENTRY;
 364                         break;
 365                 }
 366                 /* Get the  acpi_handle. */
 367
 368                 list->handles[i] = element->reference.handle;
 369                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found reference [%p]\n",
 370                                   list->handles[i]));
 371         }
 372
 373       end:
 374         if (ACPI_FAILURE(status)) {
 375                 list->count = 0;
 376                 //kfree(list->handles);
 377         }
 378
 379         kfree(buffer.pointer);
 380
 381         return status;
 382 }
 383
 384 EXPORT_SYMBOL(acpi_evaluate_reference);