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 - 2005, 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 #include <acpi/acpi.h>
  46 #include <acpi/acnamesp.h>
  47
  48 #define _COMPONENT          ACPI_NAMESPACE
  49 ACPI_MODULE_NAME("nsobject")
  50
  51 /*******************************************************************************
  52  *
  53  * FUNCTION:    acpi_ns_attach_object
  54  *
  55  * PARAMETERS:  Node                - Parent Node
  56  *              Object              - Object to be attached
  57  *              Type                - Type of object, or ACPI_TYPE_ANY if not
  58  *                                    known
  59  *
  60  * RETURN:      Status
  61  *
  62  * DESCRIPTION: Record the given object as the value associated with the
  63  *              name whose acpi_handle is passed.  If Object is NULL
  64  *              and Type is ACPI_TYPE_ANY, set the name as having no value.
  65  *              Note: Future may require that the Node->Flags field be passed
  66  *              as a parameter.
  67  *
  68  * MUTEX:       Assumes namespace is locked
  69  *
  70  ******************************************************************************/
  71 acpi_status
  72 acpi_ns_attach_object(struct acpi_namespace_node *node,
  73                       union acpi_operand_object *object, acpi_object_type type)
  74 {
  75         union acpi_operand_object *obj_desc;
  76         union acpi_operand_object *last_obj_desc;
  77         acpi_object_type object_type = ACPI_TYPE_ANY;
  78
  79         ACPI_FUNCTION_TRACE("ns_attach_object");
  80
  81         /*
  82          * Parameter validation
  83          */
  84         if (!node) {
  85                 /* Invalid handle */
  86
  87                 ACPI_REPORT_ERROR(("ns_attach_object: Null named_obj handle\n"));
  88                 return_ACPI_STATUS(AE_BAD_PARAMETER);
  89         }
  90
  91         if (!object && (ACPI_TYPE_ANY != type)) {
  92                 /* Null object */
  93
  94                 ACPI_REPORT_ERROR(("ns_attach_object: Null object, but type not ACPI_TYPE_ANY\n"));
  95                 return_ACPI_STATUS(AE_BAD_PARAMETER);
  96         }
  97
  98         if (ACPI_GET_DESCRIPTOR_TYPE(node) != ACPI_DESC_TYPE_NAMED) {
  99                 /* Not a name handle */
 100
 101                 ACPI_REPORT_ERROR(("ns_attach_object: Invalid handle %p [%s]\n",
 102                                    node, acpi_ut_get_descriptor_name(node)));
 103                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 104         }
 105
 106         /* Check if this object is already attached */
 107
 108         if (node->object == object) {
 109                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 110                                   "Obj %p already installed in name_obj %p\n",
 111                                   object, node));
 112
 113                 return_ACPI_STATUS(AE_OK);
 114         }
 115
 116         /* If null object, we will just install it */
 117
 118         if (!object) {
 119                 obj_desc = NULL;
 120                 object_type = ACPI_TYPE_ANY;
 121         }
 122
 123         /*
 124          * If the source object is a namespace Node with an attached object,
 125          * we will use that (attached) object
 126          */
 127         else if ((ACPI_GET_DESCRIPTOR_TYPE(object) == ACPI_DESC_TYPE_NAMED) &&
 128                  ((struct acpi_namespace_node *)object)->object) {
 129                 /*
 130                  * Value passed is a name handle and that name has a
 131                  * non-null value.  Use that name's value and type.
 132                  */
 133                 obj_desc = ((struct acpi_namespace_node *)object)->object;
 134                 object_type = ((struct acpi_namespace_node *)object)->type;
 135         }
 136
 137         /*
 138          * Otherwise, we will use the parameter object, but we must type
 139          * it first
 140          */
 141         else {
 142                 obj_desc = (union acpi_operand_object *)object;
 143
 144                 /* Use the given type */
 145
 146                 object_type = type;
 147         }
 148
 149         ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Installing %p into Node %p [%4.4s]\n",
 150                           obj_desc, node, acpi_ut_get_node_name(node)));
 151
 152         /* Detach an existing attached object if present */
 153
 154         if (node->object) {
 155                 acpi_ns_detach_object(node);
 156         }
 157
 158         if (obj_desc) {
 159                 /*
 160                  * Must increment the new value's reference count
 161                  * (if it is an internal object)
 162                  */
 163                 acpi_ut_add_reference(obj_desc);
 164
 165                 /*
 166                  * Handle objects with multiple descriptors - walk
 167                  * to the end of the descriptor list
 168                  */
 169                 last_obj_desc = obj_desc;
 170                 while (last_obj_desc->common.next_object) {
 171                         last_obj_desc = last_obj_desc->common.next_object;
 172                 }
 173
 174                 /* Install the object at the front of the object list */
 175
 176                 last_obj_desc->common.next_object = node->object;
 177         }
 178
 179         node->type = (u8) object_type;
 180         node->object = obj_desc;
 181
 182         return_ACPI_STATUS(AE_OK);
 183 }
 184
 185 /*******************************************************************************
 186  *
 187  * FUNCTION:    acpi_ns_detach_object
 188  *
 189  * PARAMETERS:  Node           - A Namespace node whose object will be detached
 190  *
 191  * RETURN:      None.
 192  *
 193  * DESCRIPTION: Detach/delete an object associated with a namespace node.
 194  *              if the object is an allocated object, it is freed.
 195  *              Otherwise, the field is simply cleared.
 196  *
 197  ******************************************************************************/
 198
 199 void acpi_ns_detach_object(struct acpi_namespace_node *node)
 200 {
 201         union acpi_operand_object *obj_desc;
 202
 203         ACPI_FUNCTION_TRACE("ns_detach_object");
 204
 205         obj_desc = node->object;
 206
 207         if (!obj_desc ||
 208             (ACPI_GET_OBJECT_TYPE(obj_desc) == ACPI_TYPE_LOCAL_DATA)) {
 209                 return_VOID;
 210         }
 211
 212         /* Clear the entry in all cases */
 213
 214         node->object = NULL;
 215         if (ACPI_GET_DESCRIPTOR_TYPE(obj_desc) == ACPI_DESC_TYPE_OPERAND) {
 216                 node->object = obj_desc->common.next_object;
 217                 if (node->object &&
 218                     (ACPI_GET_OBJECT_TYPE(node->object) !=
 219                      ACPI_TYPE_LOCAL_DATA)) {
 220                         node->object = node->object->common.next_object;
 221                 }
 222         }
 223
 224         /* Reset the node type to untyped */
 225
 226         node->type = ACPI_TYPE_ANY;
 227
 228         ACPI_DEBUG_PRINT((ACPI_DB_NAMES, "Node %p [%4.4s] Object %p\n",
 229                           node, acpi_ut_get_node_name(node), obj_desc));
 230
 231         /* Remove one reference on the object (and all subobjects) */
 232
 233         acpi_ut_remove_reference(obj_desc);
 234         return_VOID;
 235 }
 236
 237 /*******************************************************************************
 238  *
 239  * FUNCTION:    acpi_ns_get_attached_object
 240  *
 241  * PARAMETERS:  Node             - Namespace node
 242  *
 243  * RETURN:      Current value of the object field from the Node whose
 244  *              handle is passed
 245  *
 246  * DESCRIPTION: Obtain the object attached to a namespace node.
 247  *
 248  ******************************************************************************/
 249
 250 union acpi_operand_object *acpi_ns_get_attached_object(struct
 251                                                        acpi_namespace_node
 252                                                        *node)
 253 {
 254         ACPI_FUNCTION_TRACE_PTR("ns_get_attached_object", node);
 255
 256         if (!node) {
 257                 ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Null Node ptr\n"));
 258                 return_PTR(NULL);
 259         }
 260
 261         if (!node->object ||
 262             ((ACPI_GET_DESCRIPTOR_TYPE(node->object) != ACPI_DESC_TYPE_OPERAND)
 263              && (ACPI_GET_DESCRIPTOR_TYPE(node->object) !=
 264                  ACPI_DESC_TYPE_NAMED))
 265             || (ACPI_GET_OBJECT_TYPE(node->object) == ACPI_TYPE_LOCAL_DATA)) {
 266                 return_PTR(NULL);
 267         }
 268
 269         return_PTR(node->object);
 270 }
 271
 272 /*******************************************************************************
 273  *
 274  * FUNCTION:    acpi_ns_get_secondary_object
 275  *
 276  * PARAMETERS:  Node             - Namespace node
 277  *
 278  * RETURN:      Current value of the object field from the Node whose
 279  *              handle is passed.
 280  *
 281  * DESCRIPTION: Obtain a secondary object associated with a namespace node.
 282  *
 283  ******************************************************************************/
 284
 285 union acpi_operand_object *acpi_ns_get_secondary_object(union
 286                                                         acpi_operand_object
 287                                                         *obj_desc)
 288 {
 289         ACPI_FUNCTION_TRACE_PTR("ns_get_secondary_object", obj_desc);
 290
 291         if ((!obj_desc) ||
 292             (ACPI_GET_OBJECT_TYPE(obj_desc) == ACPI_TYPE_LOCAL_DATA) ||
 293             (!obj_desc->common.next_object) ||
 294             (ACPI_GET_OBJECT_TYPE(obj_desc->common.next_object) ==
 295              ACPI_TYPE_LOCAL_DATA)) {
 296                 return_PTR(NULL);
 297         }
 298
 299         return_PTR(obj_desc->common.next_object);
 300 }
 301
 302 /*******************************************************************************
 303  *
 304  * FUNCTION:    acpi_ns_attach_data
 305  *
 306  * PARAMETERS:  Node            - Namespace node
 307  *              Handler         - Handler to be associated with the data
 308  *              Data            - Data to be attached
 309  *
 310  * RETURN:      Status
 311  *
 312  * DESCRIPTION: Low-level attach data.  Create and attach a Data object.
 313  *
 314  ******************************************************************************/
 315
 316 acpi_status
 317 acpi_ns_attach_data(struct acpi_namespace_node *node,
 318                     acpi_object_handler handler, void *data)
 319 {
 320         union acpi_operand_object *prev_obj_desc;
 321         union acpi_operand_object *obj_desc;
 322         union acpi_operand_object *data_desc;
 323
 324         /* We only allow one attachment per handler */
 325
 326         prev_obj_desc = NULL;
 327         obj_desc = node->object;
 328         while (obj_desc) {
 329                 if ((ACPI_GET_OBJECT_TYPE(obj_desc) == ACPI_TYPE_LOCAL_DATA) &&
 330                     (obj_desc->data.handler == handler)) {
 331                         return (AE_ALREADY_EXISTS);
 332                 }
 333
 334                 prev_obj_desc = obj_desc;
 335                 obj_desc = obj_desc->common.next_object;
 336         }
 337
 338         /* Create an internal object for the data */
 339
 340         data_desc = acpi_ut_create_internal_object(ACPI_TYPE_LOCAL_DATA);
 341         if (!data_desc) {
 342                 return (AE_NO_MEMORY);
 343         }
 344
 345         data_desc->data.handler = handler;
 346         data_desc->data.pointer = data;
 347
 348         /* Install the data object */
 349
 350         if (prev_obj_desc) {
 351                 prev_obj_desc->common.next_object = data_desc;
 352         } else {
 353                 node->object = data_desc;
 354         }
 355
 356         return (AE_OK);
 357 }
 358
 359 /*******************************************************************************
 360  *
 361  * FUNCTION:    acpi_ns_detach_data
 362  *
 363  * PARAMETERS:  Node            - Namespace node
 364  *              Handler         - Handler associated with the data
 365  *
 366  * RETURN:      Status
 367  *
 368  * DESCRIPTION: Low-level detach data.  Delete the data node, but the caller
 369  *              is responsible for the actual data.
 370  *
 371  ******************************************************************************/
 372
 373 acpi_status
 374 acpi_ns_detach_data(struct acpi_namespace_node * node,
 375                     acpi_object_handler handler)
 376 {
 377         union acpi_operand_object *obj_desc;
 378         union acpi_operand_object *prev_obj_desc;
 379
 380         prev_obj_desc = NULL;
 381         obj_desc = node->object;
 382         while (obj_desc) {
 383                 if ((ACPI_GET_OBJECT_TYPE(obj_desc) == ACPI_TYPE_LOCAL_DATA) &&
 384                     (obj_desc->data.handler == handler)) {
 385                         if (prev_obj_desc) {
 386                                 prev_obj_desc->common.next_object =
 387                                     obj_desc->common.next_object;
 388                         } else {
 389                                 node->object = obj_desc->common.next_object;
 390                         }
 391
 392                         acpi_ut_remove_reference(obj_desc);
 393                         return (AE_OK);
 394                 }
 395
 396                 prev_obj_desc = obj_desc;
 397                 obj_desc = obj_desc->common.next_object;
 398         }
 399
 400         return (AE_NOT_FOUND);
 401 }
 402
 403 /*******************************************************************************
 404  *
 405  * FUNCTION:    acpi_ns_get_attached_data
 406  *
 407  * PARAMETERS:  Node            - Namespace node
 408  *              Handler         - Handler associated with the data
 409  *              Data            - Where the data is returned
 410  *
 411  * RETURN:      Status
 412  *
 413  * DESCRIPTION: Low level interface to obtain data previously associated with
 414  *              a namespace node.
 415  *
 416  ******************************************************************************/
 417
 418 acpi_status
 419 acpi_ns_get_attached_data(struct acpi_namespace_node * node,
 420                           acpi_object_handler handler, void **data)
 421 {
 422         union acpi_operand_object *obj_desc;
 423
 424         obj_desc = node->object;
 425         while (obj_desc) {
 426                 if ((ACPI_GET_OBJECT_TYPE(obj_desc) == ACPI_TYPE_LOCAL_DATA) &&
 427                     (obj_desc->data.handler == handler)) {
 428                         *data = obj_desc->data.pointer;
 429                         return (AE_OK);
 430                 }
 431
 432                 obj_desc = obj_desc->common.next_object;
 433         }
 434
 435         return (AE_NOT_FOUND);
 436 }