drivers/acpi/namespace/nsobject.c

   1 /*******************************************************************************
   2  *
   3  * Module Name: nsobject - Utilities for objects attached to namespace
   4  *                         table entries
   5  *
   6  ******************************************************************************/
   7
   8 /*
   9  * Copyright (C) 2000 - 2004, R. Byron Moore
  10  * All rights reserved.
  11  *
  12  * Redistribution and use in source and binary forms, with or without
  13  * modification, are permitted provided that the following conditions
  14  * are met:
  15  * 1. Redistributions of source code must retain the above copyright
  16  *    notice, this list of conditions, and the following disclaimer,
  17  *    without modification.
  18  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  19  *    substantially similar to the "NO WARRANTY" disclaimer below
  20  *    ("Disclaimer") and any redistribution must be conditioned upon
  21  *    including a substantially similar Disclaimer requirement for further
  22  *    binary redistribution.
  23  * 3. Neither the names of the above-listed copyright holders nor the names
  24  *    of any contributors may be used to endorse or promote products derived
  25  *    from this software without specific prior written permission.
  26  *
  27  * Alternatively, this software may be distributed under the terms of the
  28  * GNU General Public License ("GPL") version 2 as published by the Free
  29  * Software Foundation.
  30  *
  31  * NO WARRANTY
  32  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  33  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  34  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  35  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  36  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  37  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  38  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  39  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  40  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  41  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  42  * POSSIBILITY OF SUCH DAMAGES.
  43  */
  44
  45
  46 #include <acpi/acpi.h>
  47 #include <acpi/acnamesp.h>
  48
  49
  50 #define _COMPONENT          ACPI_NAMESPACE
  51          ACPI_MODULE_NAME    ("nsobject")
  52
  53
  54 /*******************************************************************************
  55  *
  56  * FUNCTION:    acpi_ns_attach_object
  57  *
  58  * PARAMETERS:  Node                - Parent Node
  59  *              Object              - Object to be attached
  60  *              Type                - Type of object, or ACPI_TYPE_ANY if not
  61  *                                    known
  62  *
  63  * DESCRIPTION: Record the given object as the value associated with the
  64  *              name whose acpi_handle is passed.  If Object is NULL
  65  *              and Type is ACPI_TYPE_ANY, set the name as having no value.
  66  *              Note: Future may require that the Node->Flags field be passed
  67  *              as a parameter.
  68  *
  69  * MUTEX:       Assumes namespace is locked
  70  *
  71  ******************************************************************************/
  72
  73 acpi_status
  74 acpi_ns_attach_object (
  75         struct acpi_namespace_node      *node,
  76         union acpi_operand_object       *object,
  77         acpi_object_type                type)
  78 {
  79         union acpi_operand_object       *obj_desc;
  80         union acpi_operand_object       *last_obj_desc;
  81         acpi_object_type                object_type = ACPI_TYPE_ANY;
  82
  83
  84         ACPI_FUNCTION_TRACE ("ns_attach_object");
  85
  86
  87         /*
  88          * Parameter validation
  89          */
  90         if (!node) {
  91                 /* Invalid handle */
  92
  93                 ACPI_REPORT_ERROR (("ns_attach_object: Null named_obj handle\n"));
  94                 return_ACPI_STATUS (AE_BAD_PARAMETER);
  95         }
  96
  97         if (!object && (ACPI_TYPE_ANY != type)) {
  98                 /* Null object */
  99
 100                 ACPI_REPORT_ERROR (("ns_attach_object: Null object, but type not ACPI_TYPE_ANY\n"));
 101                 return_ACPI_STATUS (AE_BAD_PARAMETER);
 102         }
 103
 104         if (ACPI_GET_DESCRIPTOR_TYPE (node) != ACPI_DESC_TYPE_NAMED) {
 105                 /* Not a name handle */
 106
 107                 ACPI_REPORT_ERROR (("ns_attach_object: Invalid handle %p [%s]\n",
 108                                 node, acpi_ut_get_descriptor_name (node)));
 109                 return_ACPI_STATUS (AE_BAD_PARAMETER);
 110         }
 111
 112         /* Check if this object is already attached */
 113
 114         if (node->object == object) {
 115                 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Obj %p already installed in name_obj %p\n",
 116                         object, node));
 117
 118                 return_ACPI_STATUS (AE_OK);
 119         }
 120
 121         /* If null object, we will just install it */
 122
 123         if (!object) {
 124                 obj_desc   = NULL;
 125                 object_type = ACPI_TYPE_ANY;
 126         }
 127
 128         /*
 129          * If the source object is a namespace Node with an attached object,
 130          * we will use that (attached) object
 131          */
 132         else if ((ACPI_GET_DESCRIPTOR_TYPE (object) == ACPI_DESC_TYPE_NAMED) &&
 133                         ((struct acpi_namespace_node *) object)->object) {
 134                 /*
 135                  * Value passed is a name handle and that name has a
 136                  * non-null value.  Use that name's value and type.
 137                  */
 138                 obj_desc   = ((struct acpi_namespace_node *) object)->object;
 139                 object_type = ((struct acpi_namespace_node *) object)->type;
 140         }
 141
 142         /*
 143          * Otherwise, we will use the parameter object, but we must type
 144          * it first
 145          */
 146         else {
 147                 obj_desc = (union acpi_operand_object   *) object;
 148
 149                 /* Use the given type */
 150
 151                 object_type = type;
 152         }
 153
 154         ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Installing %p into Node %p [%4.4s]\n",
 155                 obj_desc, node, acpi_ut_get_node_name (node)));
 156
 157         /* Detach an existing attached object if present */
 158
 159         if (node->object) {
 160                 acpi_ns_detach_object (node);
 161         }
 162
 163         if (obj_desc) {
 164                 /*
 165                  * Must increment the new value's reference count
 166                  * (if it is an internal object)
 167                  */
 168                 acpi_ut_add_reference (obj_desc);
 169
 170                 /*
 171                  * Handle objects with multiple descriptors - walk
 172                  * to the end of the descriptor list
 173                  */
 174                 last_obj_desc = obj_desc;
 175                 while (last_obj_desc->common.next_object) {
 176                         last_obj_desc = last_obj_desc->common.next_object;
 177                 }
 178
 179                 /* Install the object at the front of the object list */
 180
 181                 last_obj_desc->common.next_object = node->object;
 182         }
 183
 184         node->type     = (u8) object_type;
 185         node->object   = obj_desc;
 186
 187         return_ACPI_STATUS (AE_OK);
 188 }
 189
 190
 191 /*******************************************************************************
 192  *
 193  * FUNCTION:    acpi_ns_detach_object
 194  *
 195  * PARAMETERS:  Node           - An node whose object will be detached
 196  *
 197  * RETURN:      None.
 198  *
 199  * DESCRIPTION: Detach/delete an object associated with a namespace node.
 200  *              if the object is an allocated object, it is freed.
 201  *              Otherwise, the field is simply cleared.
 202  *
 203  ******************************************************************************/
 204
 205 void
 206 acpi_ns_detach_object (
 207         struct acpi_namespace_node      *node)
 208 {
 209         union acpi_operand_object       *obj_desc;
 210
 211
 212         ACPI_FUNCTION_TRACE ("ns_detach_object");
 213
 214
 215         obj_desc = node->object;
 216
 217         if (!obj_desc ||
 218                 (ACPI_GET_OBJECT_TYPE (obj_desc) == ACPI_TYPE_LOCAL_DATA)) {
 219                 return_VOID;
 220         }
 221
 222         /* Clear the entry in all cases */
 223
 224         node->object = NULL;
 225         if (ACPI_GET_DESCRIPTOR_TYPE (obj_desc) == ACPI_DESC_TYPE_OPERAND) {
 226                 node->object = obj_desc->common.next_object;
 227                 if (node->object &&
 228                    (ACPI_GET_OBJECT_TYPE (node->object) != ACPI_TYPE_LOCAL_DATA)) {
 229                         node->object = node->object->common.next_object;
 230                 }
 231         }
 232
 233         /* Reset the node type to untyped */
 234
 235         node->type = ACPI_TYPE_ANY;
 236
 237         ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, "Node %p [%4.4s] Object %p\n",
 238                 node, acpi_ut_get_node_name (node), obj_desc));
 239
 240         /* Remove one reference on the object (and all subobjects) */
 241
 242         acpi_ut_remove_reference (obj_desc);
 243         return_VOID;
 244 }
 245
 246
 247 /*******************************************************************************
 248  *
 249  * FUNCTION:    acpi_ns_get_attached_object
 250  *
 251  * PARAMETERS:  Node             - Parent Node to be examined
 252  *
 253  * RETURN:      Current value of the object field from the Node whose
 254  *              handle is passed
 255  *
 256  * DESCRIPTION: Obtain the object attached to a namespace node.
 257  *
 258  ******************************************************************************/
 259
 260 union acpi_operand_object *
 261 acpi_ns_get_attached_object (
 262         struct acpi_namespace_node      *node)
 263 {
 264         ACPI_FUNCTION_TRACE_PTR ("ns_get_attached_object", node);
 265
 266
 267         if (!node) {
 268                 ACPI_DEBUG_PRINT ((ACPI_DB_WARN, "Null Node ptr\n"));
 269                 return_PTR (NULL);
 270         }
 271
 272         if (!node->object ||
 273                         ((ACPI_GET_DESCRIPTOR_TYPE (node->object) != ACPI_DESC_TYPE_OPERAND) &&
 274                          (ACPI_GET_DESCRIPTOR_TYPE (node->object) != ACPI_DESC_TYPE_NAMED))  ||
 275                 (ACPI_GET_OBJECT_TYPE (node->object) == ACPI_TYPE_LOCAL_DATA)) {
 276                 return_PTR (NULL);
 277         }
 278
 279         return_PTR (node->object);
 280 }
 281
 282
 283 /*******************************************************************************
 284  *
 285  * FUNCTION:    acpi_ns_get_secondary_object
 286  *
 287  * PARAMETERS:  Node             - Parent Node to be examined
 288  *
 289  * RETURN:      Current value of the object field from the Node whose
 290  *              handle is passed.
 291  *
 292  * DESCRIPTION: Obtain a secondary object associated with a namespace node.
 293  *
 294  ******************************************************************************/
 295
 296 union acpi_operand_object *
 297 acpi_ns_get_secondary_object (
 298         union acpi_operand_object       *obj_desc)
 299 {
 300         ACPI_FUNCTION_TRACE_PTR ("ns_get_secondary_object", obj_desc);
 301
 302
 303         if ((!obj_desc)                                               ||
 304                 (ACPI_GET_OBJECT_TYPE (obj_desc) == ACPI_TYPE_LOCAL_DATA) ||
 305                 (!obj_desc->common.next_object)                           ||
 306                 (ACPI_GET_OBJECT_TYPE (obj_desc->common.next_object) == ACPI_TYPE_LOCAL_DATA)) {
 307                 return_PTR (NULL);
 308         }
 309
 310         return_PTR (obj_desc->common.next_object);
 311 }
 312
 313
 314 /*******************************************************************************
 315  *
 316  * FUNCTION:    acpi_ns_attach_data
 317  *
 318  * PARAMETERS:  Node            - Namespace node
 319  *              Handler         - Handler to be associated with the data
 320  *              Data            - Data to be attached
 321  *
 322  * RETURN:      Status
 323  *
 324  * DESCRIPTION: Low-level attach data.  Create and attach a Data object.
 325  *
 326  ******************************************************************************/
 327
 328 acpi_status
 329 acpi_ns_attach_data (
 330         struct acpi_namespace_node      *node,
 331         acpi_object_handler             handler,
 332         void                            *data)
 333 {
 334         union acpi_operand_object       *prev_obj_desc;
 335         union acpi_operand_object       *obj_desc;
 336         union acpi_operand_object       *data_desc;
 337
 338
 339         /* We only allow one attachment per handler */
 340
 341         prev_obj_desc = NULL;
 342         obj_desc = node->object;
 343         while (obj_desc) {
 344                 if ((ACPI_GET_OBJECT_TYPE (obj_desc) == ACPI_TYPE_LOCAL_DATA) &&
 345                         (obj_desc->data.handler == handler)) {
 346                         return (AE_ALREADY_EXISTS);
 347                 }
 348
 349                 prev_obj_desc = obj_desc;
 350                 obj_desc = obj_desc->common.next_object;
 351         }
 352
 353         /* Create an internal object for the data */
 354
 355         data_desc = acpi_ut_create_internal_object (ACPI_TYPE_LOCAL_DATA);
 356         if (!data_desc) {
 357                 return (AE_NO_MEMORY);
 358         }
 359
 360         data_desc->data.handler = handler;
 361         data_desc->data.pointer = data;
 362
 363         /* Install the data object */
 364
 365         if (prev_obj_desc) {
 366                 prev_obj_desc->common.next_object = data_desc;
 367         }
 368         else {
 369                 node->object = data_desc;
 370         }
 371
 372         return (AE_OK);
 373 }
 374
 375
 376 /*******************************************************************************
 377  *
 378  * FUNCTION:    acpi_ns_detach_data
 379  *
 380  * PARAMETERS:  Node            - Namespace node
 381  *              Handler         - Handler associated with the data
 382  *
 383  * RETURN:      Status
 384  *
 385  * DESCRIPTION: Low-level detach data.  Delete the data node, but the caller
 386  *              is responsible for the actual data.
 387  *
 388  ******************************************************************************/
 389
 390 acpi_status
 391 acpi_ns_detach_data (
 392         struct acpi_namespace_node      *node,
 393         acpi_object_handler             handler)
 394 {
 395         union acpi_operand_object       *obj_desc;
 396         union acpi_operand_object       *prev_obj_desc;
 397
 398
 399         prev_obj_desc = NULL;
 400         obj_desc = node->object;
 401         while (obj_desc) {
 402                 if ((ACPI_GET_OBJECT_TYPE (obj_desc) == ACPI_TYPE_LOCAL_DATA) &&
 403                         (obj_desc->data.handler == handler)) {
 404                         if (prev_obj_desc) {
 405                                 prev_obj_desc->common.next_object = obj_desc->common.next_object;
 406                         }
 407                         else {
 408                                 node->object = obj_desc->common.next_object;
 409                         }
 410
 411                         acpi_ut_remove_reference (obj_desc);
 412                         return (AE_OK);
 413                 }
 414
 415                 prev_obj_desc = obj_desc;
 416                 obj_desc = obj_desc->common.next_object;
 417         }
 418
 419         return (AE_NOT_FOUND);
 420 }
 421
 422
 423 /*******************************************************************************
 424  *
 425  * FUNCTION:    acpi_ns_get_attached_data
 426  *
 427  * PARAMETERS:  Node            - Namespace node
 428  *              Handler         - Handler associated with the data
 429  *              Data            - Where the data is returned
 430  *
 431  * RETURN:      Status
 432  *
 433  * DESCRIPTION: Low level interface to obtain data previously associated with
 434  *              a namespace node.
 435  *
 436  ******************************************************************************/
 437
 438 acpi_status
 439 acpi_ns_get_attached_data (
 440         struct acpi_namespace_node      *node,
 441         acpi_object_handler             handler,
 442         void                            **data)
 443 {
 444         union acpi_operand_object       *obj_desc;
 445
 446
 447         obj_desc = node->object;
 448         while (obj_desc) {
 449                 if ((ACPI_GET_OBJECT_TYPE (obj_desc) == ACPI_TYPE_LOCAL_DATA) &&
 450                         (obj_desc->data.handler == handler)) {
 451                         *data = obj_desc->data.pointer;
 452                         return (AE_OK);
 453                 }
 454
 455                 obj_desc = obj_desc->common.next_object;
 456         }
 457
 458         return (AE_NOT_FOUND);
 459 }
 460
 461