drivers/acpi/acpica/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 - 2008, Intel Corp.
  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 #include <acpi/acpi.h>
  46 #include "accommon.h"
  47 #include "acnamesp.h"
  48
  49 #define _COMPONENT          ACPI_NAMESPACE
  50 ACPI_MODULE_NAME("nsobject")
  51
  52 /*******************************************************************************
  53  *
  54  * FUNCTION:    acpi_ns_attach_object
  55  *
  56  * PARAMETERS:  Node                - Parent Node
  57  *              Object              - Object to be attached
  58  *              Type                - Type of object, or ACPI_TYPE_ANY if not
  59  *                                    known
  60  *
  61  * RETURN:      Status
  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 acpi_status
  73 acpi_ns_attach_object(struct acpi_namespace_node *node,
  74                       union acpi_operand_object *object, acpi_object_type type)
  75 {
  76         union acpi_operand_object *obj_desc;
  77         union acpi_operand_object *last_obj_desc;
  78         acpi_object_type object_type = ACPI_TYPE_ANY;
  79
  80         ACPI_FUNCTION_TRACE(ns_attach_object);
  81
  82         /*
  83          * Parameter validation
  84          */
  85         if (!node) {
  86
  87                 /* Invalid handle */
  88
  89                 ACPI_ERROR((AE_INFO, "Null NamedObj handle"));
  90                 return_ACPI_STATUS(AE_BAD_PARAMETER);
  91         }
  92
  93         if (!object && (ACPI_TYPE_ANY != type)) {
  94
  95                 /* Null object */
  96
  97                 ACPI_ERROR((AE_INFO,
  98                             "Null object, but type not ACPI_TYPE_ANY"));
  99                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 100         }
 101
 102         if (ACPI_GET_DESCRIPTOR_TYPE(node) != ACPI_DESC_TYPE_NAMED) {
 103
 104                 /* Not a name handle */
 105
 106                 ACPI_ERROR((AE_INFO, "Invalid handle %p [%s]",
 107                             node, acpi_ut_get_descriptor_name(node)));
 108                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 109         }
 110
 111         /* Check if this object is already attached */
 112
 113         if (node->object == object) {
 114                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 115                                   "Obj %p already installed in NameObj %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  * FUNCTION:    acpi_ns_detach_object
 193  *
 194  * PARAMETERS:  Node           - A Namespace node whose object will be detached
 195  *
 196  * RETURN:      None.
 197  *
 198  * DESCRIPTION: Detach/delete an object associated with a namespace node.
 199  *              if the object is an allocated object, it is freed.
 200  *              Otherwise, the field is simply cleared.
 201  *
 202  ******************************************************************************/
 203
 204 void acpi_ns_detach_object(struct acpi_namespace_node *node)
 205 {
 206         union acpi_operand_object *obj_desc;
 207
 208         ACPI_FUNCTION_TRACE(ns_detach_object);
 209
 210         obj_desc = node->object;
 211
 212         if (!obj_desc || (obj_desc->common.type == ACPI_TYPE_LOCAL_DATA)) {
 213                 return_VOID;
 214         }
 215
 216         /* Clear the entry in all cases */
 217
 218         node->object = NULL;
 219         if (ACPI_GET_DESCRIPTOR_TYPE(obj_desc) == ACPI_DESC_TYPE_OPERAND) {
 220                 node->object = obj_desc->common.next_object;
 221                 if (node->object &&
 222                     ((node->object)->common.type != ACPI_TYPE_LOCAL_DATA)) {
 223                         node->object = node->object->common.next_object;
 224                 }
 225         }
 226
 227         /* Reset the node type to untyped */
 228
 229         node->type = ACPI_TYPE_ANY;
 230
 231         ACPI_DEBUG_PRINT((ACPI_DB_NAMES, "Node %p [%4.4s] Object %p\n",
 232                           node, acpi_ut_get_node_name(node), obj_desc));
 233
 234         /* Remove one reference on the object (and all subobjects) */
 235
 236         acpi_ut_remove_reference(obj_desc);
 237         return_VOID;
 238 }
 239
 240 /*******************************************************************************
 241  *
 242  * FUNCTION:    acpi_ns_get_attached_object
 243  *
 244  * PARAMETERS:  Node             - Namespace node
 245  *
 246  * RETURN:      Current value of the object field from the Node whose
 247  *              handle is passed
 248  *
 249  * DESCRIPTION: Obtain the object attached to a namespace node.
 250  *
 251  ******************************************************************************/
 252
 253 union acpi_operand_object *acpi_ns_get_attached_object(struct
 254                                                        acpi_namespace_node
 255                                                        *node)
 256 {
 257         ACPI_FUNCTION_TRACE_PTR(ns_get_attached_object, node);
 258
 259         if (!node) {
 260                 ACPI_WARNING((AE_INFO, "Null Node ptr"));
 261                 return_PTR(NULL);
 262         }
 263
 264         if (!node->object ||
 265             ((ACPI_GET_DESCRIPTOR_TYPE(node->object) != ACPI_DESC_TYPE_OPERAND)
 266              && (ACPI_GET_DESCRIPTOR_TYPE(node->object) !=
 267                  ACPI_DESC_TYPE_NAMED))
 268             || ((node->object)->common.type == ACPI_TYPE_LOCAL_DATA)) {
 269                 return_PTR(NULL);
 270         }
 271
 272         return_PTR(node->object);
 273 }
 274
 275 /*******************************************************************************
 276  *
 277  * FUNCTION:    acpi_ns_get_secondary_object
 278  *
 279  * PARAMETERS:  Node             - Namespace node
 280  *
 281  * RETURN:      Current value of the object field from the Node whose
 282  *              handle is passed.
 283  *
 284  * DESCRIPTION: Obtain a secondary object associated with a namespace node.
 285  *
 286  ******************************************************************************/
 287
 288 union acpi_operand_object *acpi_ns_get_secondary_object(union
 289                                                         acpi_operand_object
 290                                                         *obj_desc)
 291 {
 292         ACPI_FUNCTION_TRACE_PTR(ns_get_secondary_object, obj_desc);
 293
 294         if ((!obj_desc) ||
 295             (obj_desc->common.type == ACPI_TYPE_LOCAL_DATA) ||
 296             (!obj_desc->common.next_object) ||
 297             ((obj_desc->common.next_object)->common.type ==
 298              ACPI_TYPE_LOCAL_DATA)) {
 299                 return_PTR(NULL);
 300         }
 301
 302         return_PTR(obj_desc->common.next_object);
 303 }
 304
 305 /*******************************************************************************
 306  *
 307  * FUNCTION:    acpi_ns_attach_data
 308  *
 309  * PARAMETERS:  Node            - Namespace node
 310  *              Handler         - Handler to be associated with the data
 311  *              Data            - Data to be attached
 312  *
 313  * RETURN:      Status
 314  *
 315  * DESCRIPTION: Low-level attach data.  Create and attach a Data object.
 316  *
 317  ******************************************************************************/
 318
 319 acpi_status
 320 acpi_ns_attach_data(struct acpi_namespace_node *node,
 321                     acpi_object_handler handler, void *data)
 322 {
 323         union acpi_operand_object *prev_obj_desc;
 324         union acpi_operand_object *obj_desc;
 325         union acpi_operand_object *data_desc;
 326
 327         /* We only allow one attachment per handler */
 328
 329         prev_obj_desc = NULL;
 330         obj_desc = node->object;
 331         while (obj_desc) {
 332                 if ((obj_desc->common.type == ACPI_TYPE_LOCAL_DATA) &&
 333                     (obj_desc->data.handler == handler)) {
 334                         return (AE_ALREADY_EXISTS);
 335                 }
 336
 337                 prev_obj_desc = obj_desc;
 338                 obj_desc = obj_desc->common.next_object;
 339         }
 340
 341         /* Create an internal object for the data */
 342
 343         data_desc = acpi_ut_create_internal_object(ACPI_TYPE_LOCAL_DATA);
 344         if (!data_desc) {
 345                 return (AE_NO_MEMORY);
 346         }
 347
 348         data_desc->data.handler = handler;
 349         data_desc->data.pointer = data;
 350
 351         /* Install the data object */
 352
 353         if (prev_obj_desc) {
 354                 prev_obj_desc->common.next_object = data_desc;
 355         } else {
 356                 node->object = data_desc;
 357         }
 358
 359         return (AE_OK);
 360 }
 361
 362 /*******************************************************************************
 363  *
 364  * FUNCTION:    acpi_ns_detach_data
 365  *
 366  * PARAMETERS:  Node            - Namespace node
 367  *              Handler         - Handler associated with the data
 368  *
 369  * RETURN:      Status
 370  *
 371  * DESCRIPTION: Low-level detach data.  Delete the data node, but the caller
 372  *              is responsible for the actual data.
 373  *
 374  ******************************************************************************/
 375
 376 acpi_status
 377 acpi_ns_detach_data(struct acpi_namespace_node * node,
 378                     acpi_object_handler handler)
 379 {
 380         union acpi_operand_object *obj_desc;
 381         union acpi_operand_object *prev_obj_desc;
 382
 383         prev_obj_desc = NULL;
 384         obj_desc = node->object;
 385         while (obj_desc) {
 386                 if ((obj_desc->common.type == ACPI_TYPE_LOCAL_DATA) &&
 387                     (obj_desc->data.handler == handler)) {
 388                         if (prev_obj_desc) {
 389                                 prev_obj_desc->common.next_object =
 390                                     obj_desc->common.next_object;
 391                         } else {
 392                                 node->object = obj_desc->common.next_object;
 393                         }
 394
 395                         acpi_ut_remove_reference(obj_desc);
 396                         return (AE_OK);
 397                 }
 398
 399                 prev_obj_desc = obj_desc;
 400                 obj_desc = obj_desc->common.next_object;
 401         }
 402
 403         return (AE_NOT_FOUND);
 404 }
 405
 406 /*******************************************************************************
 407  *
 408  * FUNCTION:    acpi_ns_get_attached_data
 409  *
 410  * PARAMETERS:  Node            - Namespace node
 411  *              Handler         - Handler associated with the data
 412  *              Data            - Where the data is returned
 413  *
 414  * RETURN:      Status
 415  *
 416  * DESCRIPTION: Low level interface to obtain data previously associated with
 417  *              a namespace node.
 418  *
 419  ******************************************************************************/
 420
 421 acpi_status
 422 acpi_ns_get_attached_data(struct acpi_namespace_node * node,
 423                           acpi_object_handler handler, void **data)
 424 {
 425         union acpi_operand_object *obj_desc;
 426
 427         obj_desc = node->object;
 428         while (obj_desc) {
 429                 if ((obj_desc->common.type == ACPI_TYPE_LOCAL_DATA) &&
 430                     (obj_desc->data.handler == handler)) {
 431                         *data = obj_desc->data.pointer;
 432                         return (AE_OK);
 433                 }
 434
 435                 obj_desc = obj_desc->common.next_object;
 436         }
 437
 438         return (AE_NOT_FOUND);
 439 }