| /******************************************************************************* |
| * |
| * Module Name: nsobject - Utilities for objects attached to namespace |
| * table entries |
| * |
| ******************************************************************************/ |
| |
| /* |
| * Copyright (C) 2000 - 2008, Intel Corp. |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions, and the following disclaimer, |
| * without modification. |
| * 2. Redistributions in binary form must reproduce at minimum a disclaimer |
| * substantially similar to the "NO WARRANTY" disclaimer below |
| * ("Disclaimer") and any redistribution must be conditioned upon |
| * including a substantially similar Disclaimer requirement for further |
| * binary redistribution. |
| * 3. Neither the names of the above-listed copyright holders nor the names |
| * of any contributors may be used to endorse or promote products derived |
| * from this software without specific prior written permission. |
| * |
| * Alternatively, this software may be distributed under the terms of the |
| * GNU General Public License ("GPL") version 2 as published by the Free |
| * Software Foundation. |
| * |
| * NO WARRANTY |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR |
| * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
| * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING |
| * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| * POSSIBILITY OF SUCH DAMAGES. |
| */ |
| |
| #include <acpi/acpi.h> |
| #include <acpi/accommon.h> |
| #include <acpi/acnamesp.h> |
| |
| #define _COMPONENT ACPI_NAMESPACE |
| ACPI_MODULE_NAME("nsobject") |
| |
| /******************************************************************************* |
| * |
| * FUNCTION: acpi_ns_attach_object |
| * |
| * PARAMETERS: Node - Parent Node |
| * Object - Object to be attached |
| * Type - Type of object, or ACPI_TYPE_ANY if not |
| * known |
| * |
| * RETURN: Status |
| * |
| * DESCRIPTION: Record the given object as the value associated with the |
| * name whose acpi_handle is passed. If Object is NULL |
| * and Type is ACPI_TYPE_ANY, set the name as having no value. |
| * Note: Future may require that the Node->Flags field be passed |
| * as a parameter. |
| * |
| * MUTEX: Assumes namespace is locked |
| * |
| ******************************************************************************/ |
| acpi_status |
| acpi_ns_attach_object(struct acpi_namespace_node *node, |
| union acpi_operand_object *object, acpi_object_type type) |
| { |
| union acpi_operand_object *obj_desc; |
| union acpi_operand_object *last_obj_desc; |
| acpi_object_type object_type = ACPI_TYPE_ANY; |
| |
| ACPI_FUNCTION_TRACE(ns_attach_object); |
| |
| /* |
| * Parameter validation |
| */ |
| if (!node) { |
| |
| /* Invalid handle */ |
| |
| ACPI_ERROR((AE_INFO, "Null NamedObj handle")); |
| return_ACPI_STATUS(AE_BAD_PARAMETER); |
| } |
| |
| if (!object && (ACPI_TYPE_ANY != type)) { |
| |
| /* Null object */ |
| |
| ACPI_ERROR((AE_INFO, |
| "Null object, but type not ACPI_TYPE_ANY")); |
| return_ACPI_STATUS(AE_BAD_PARAMETER); |
| } |
| |
| if (ACPI_GET_DESCRIPTOR_TYPE(node) != ACPI_DESC_TYPE_NAMED) { |
| |
| /* Not a name handle */ |
| |
| ACPI_ERROR((AE_INFO, "Invalid handle %p [%s]", |
| node, acpi_ut_get_descriptor_name(node))); |
| return_ACPI_STATUS(AE_BAD_PARAMETER); |
| } |
| |
| /* Check if this object is already attached */ |
| |
| if (node->object == object) { |
| ACPI_DEBUG_PRINT((ACPI_DB_EXEC, |
| "Obj %p already installed in NameObj %p\n", |
| object, node)); |
| |
| return_ACPI_STATUS(AE_OK); |
| } |
| |
| /* If null object, we will just install it */ |
| |
| if (!object) { |
| obj_desc = NULL; |
| object_type = ACPI_TYPE_ANY; |
| } |
| |
| /* |
| * If the source object is a namespace Node with an attached object, |
| * we will use that (attached) object |
| */ |
| else if ((ACPI_GET_DESCRIPTOR_TYPE(object) == ACPI_DESC_TYPE_NAMED) && |
| ((struct acpi_namespace_node *)object)->object) { |
| /* |
| * Value passed is a name handle and that name has a |
| * non-null value. Use that name's value and type. |
| */ |
| obj_desc = ((struct acpi_namespace_node *)object)->object; |
| object_type = ((struct acpi_namespace_node *)object)->type; |
| } |
| |
| /* |
| * Otherwise, we will use the parameter object, but we must type |
| * it first |
| */ |
| else { |
| obj_desc = (union acpi_operand_object *)object; |
| |
| /* Use the given type */ |
| |
| object_type = type; |
| } |
| |
| ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Installing %p into Node %p [%4.4s]\n", |
| obj_desc, node, acpi_ut_get_node_name(node))); |
| |
| /* Detach an existing attached object if present */ |
| |
| if (node->object) { |
| acpi_ns_detach_object(node); |
| } |
| |
| if (obj_desc) { |
| /* |
| * Must increment the new value's reference count |
| * (if it is an internal object) |
| */ |
| acpi_ut_add_reference(obj_desc); |
| |
| /* |
| * Handle objects with multiple descriptors - walk |
| * to the end of the descriptor list |
| */ |
| last_obj_desc = obj_desc; |
| while (last_obj_desc->common.next_object) { |
| last_obj_desc = last_obj_desc->common.next_object; |
| } |
| |
| /* Install the object at the front of the object list */ |
| |
| last_obj_desc->common.next_object = node->object; |
| } |
| |
| node->type = (u8) object_type; |
| node->object = obj_desc; |
| |
| return_ACPI_STATUS(AE_OK); |
| } |
| |
| /******************************************************************************* |
| * |
| * FUNCTION: acpi_ns_detach_object |
| * |
| * PARAMETERS: Node - A Namespace node whose object will be detached |
| * |
| * RETURN: None. |
| * |
| * DESCRIPTION: Detach/delete an object associated with a namespace node. |
| * if the object is an allocated object, it is freed. |
| * Otherwise, the field is simply cleared. |
| * |
| ******************************************************************************/ |
| |
| void acpi_ns_detach_object(struct acpi_namespace_node *node) |
| { |
| union acpi_operand_object *obj_desc; |
| |
| ACPI_FUNCTION_TRACE(ns_detach_object); |
| |
| obj_desc = node->object; |
| |
| if (!obj_desc || |
| (ACPI_GET_OBJECT_TYPE(obj_desc) == ACPI_TYPE_LOCAL_DATA)) { |
| return_VOID; |
| } |
| |
| /* Clear the entry in all cases */ |
| |
| node->object = NULL; |
| if (ACPI_GET_DESCRIPTOR_TYPE(obj_desc) == ACPI_DESC_TYPE_OPERAND) { |
| node->object = obj_desc->common.next_object; |
| if (node->object && |
| (ACPI_GET_OBJECT_TYPE(node->object) != |
| ACPI_TYPE_LOCAL_DATA)) { |
| node->object = node->object->common.next_object; |
| } |
| } |
| |
| /* Reset the node type to untyped */ |
| |
| node->type = ACPI_TYPE_ANY; |
| |
| ACPI_DEBUG_PRINT((ACPI_DB_NAMES, "Node %p [%4.4s] Object %p\n", |
| node, acpi_ut_get_node_name(node), obj_desc)); |
| |
| /* Remove one reference on the object (and all subobjects) */ |
| |
| acpi_ut_remove_reference(obj_desc); |
| return_VOID; |
| } |
| |
| /******************************************************************************* |
| * |
| * FUNCTION: acpi_ns_get_attached_object |
| * |
| * PARAMETERS: Node - Namespace node |
| * |
| * RETURN: Current value of the object field from the Node whose |
| * handle is passed |
| * |
| * DESCRIPTION: Obtain the object attached to a namespace node. |
| * |
| ******************************************************************************/ |
| |
| union acpi_operand_object *acpi_ns_get_attached_object(struct |
| acpi_namespace_node |
| *node) |
| { |
| ACPI_FUNCTION_TRACE_PTR(ns_get_attached_object, node); |
| |
| if (!node) { |
| ACPI_WARNING((AE_INFO, "Null Node ptr")); |
| return_PTR(NULL); |
| } |
| |
| if (!node->object || |
| ((ACPI_GET_DESCRIPTOR_TYPE(node->object) != ACPI_DESC_TYPE_OPERAND) |
| && (ACPI_GET_DESCRIPTOR_TYPE(node->object) != |
| ACPI_DESC_TYPE_NAMED)) |
| || (ACPI_GET_OBJECT_TYPE(node->object) == ACPI_TYPE_LOCAL_DATA)) { |
| return_PTR(NULL); |
| } |
| |
| return_PTR(node->object); |
| } |
| |
| /******************************************************************************* |
| * |
| * FUNCTION: acpi_ns_get_secondary_object |
| * |
| * PARAMETERS: Node - Namespace node |
| * |
| * RETURN: Current value of the object field from the Node whose |
| * handle is passed. |
| * |
| * DESCRIPTION: Obtain a secondary object associated with a namespace node. |
| * |
| ******************************************************************************/ |
| |
| union acpi_operand_object *acpi_ns_get_secondary_object(union |
| acpi_operand_object |
| *obj_desc) |
| { |
| ACPI_FUNCTION_TRACE_PTR(ns_get_secondary_object, obj_desc); |
| |
| if ((!obj_desc) || |
| (ACPI_GET_OBJECT_TYPE(obj_desc) == ACPI_TYPE_LOCAL_DATA) || |
| (!obj_desc->common.next_object) || |
| (ACPI_GET_OBJECT_TYPE(obj_desc->common.next_object) == |
| ACPI_TYPE_LOCAL_DATA)) { |
| return_PTR(NULL); |
| } |
| |
| return_PTR(obj_desc->common.next_object); |
| } |
| |
| /******************************************************************************* |
| * |
| * FUNCTION: acpi_ns_attach_data |
| * |
| * PARAMETERS: Node - Namespace node |
| * Handler - Handler to be associated with the data |
| * Data - Data to be attached |
| * |
| * RETURN: Status |
| * |
| * DESCRIPTION: Low-level attach data. Create and attach a Data object. |
| * |
| ******************************************************************************/ |
| |
| acpi_status |
| acpi_ns_attach_data(struct acpi_namespace_node *node, |
| acpi_object_handler handler, void *data) |
| { |
| union acpi_operand_object *prev_obj_desc; |
| union acpi_operand_object *obj_desc; |
| union acpi_operand_object *data_desc; |
| |
| /* We only allow one attachment per handler */ |
| |
| prev_obj_desc = NULL; |
| obj_desc = node->object; |
| while (obj_desc) { |
| if ((ACPI_GET_OBJECT_TYPE(obj_desc) == ACPI_TYPE_LOCAL_DATA) && |
| (obj_desc->data.handler == handler)) { |
| return (AE_ALREADY_EXISTS); |
| } |
| |
| prev_obj_desc = obj_desc; |
| obj_desc = obj_desc->common.next_object; |
| } |
| |
| /* Create an internal object for the data */ |
| |
| data_desc = acpi_ut_create_internal_object(ACPI_TYPE_LOCAL_DATA); |
| if (!data_desc) { |
| return (AE_NO_MEMORY); |
| } |
| |
| data_desc->data.handler = handler; |
| data_desc->data.pointer = data; |
| |
| /* Install the data object */ |
| |
| if (prev_obj_desc) { |
| prev_obj_desc->common.next_object = data_desc; |
| } else { |
| node->object = data_desc; |
| } |
| |
| return (AE_OK); |
| } |
| |
| /******************************************************************************* |
| * |
| * FUNCTION: acpi_ns_detach_data |
| * |
| * PARAMETERS: Node - Namespace node |
| * Handler - Handler associated with the data |
| * |
| * RETURN: Status |
| * |
| * DESCRIPTION: Low-level detach data. Delete the data node, but the caller |
| * is responsible for the actual data. |
| * |
| ******************************************************************************/ |
| |
| acpi_status |
| acpi_ns_detach_data(struct acpi_namespace_node * node, |
| acpi_object_handler handler) |
| { |
| union acpi_operand_object *obj_desc; |
| union acpi_operand_object *prev_obj_desc; |
| |
| prev_obj_desc = NULL; |
| obj_desc = node->object; |
| while (obj_desc) { |
| if ((ACPI_GET_OBJECT_TYPE(obj_desc) == ACPI_TYPE_LOCAL_DATA) && |
| (obj_desc->data.handler == handler)) { |
| if (prev_obj_desc) { |
| prev_obj_desc->common.next_object = |
| obj_desc->common.next_object; |
| } else { |
| node->object = obj_desc->common.next_object; |
| } |
| |
| acpi_ut_remove_reference(obj_desc); |
| return (AE_OK); |
| } |
| |
| prev_obj_desc = obj_desc; |
| obj_desc = obj_desc->common.next_object; |
| } |
| |
| return (AE_NOT_FOUND); |
| } |
| |
| /******************************************************************************* |
| * |
| * FUNCTION: acpi_ns_get_attached_data |
| * |
| * PARAMETERS: Node - Namespace node |
| * Handler - Handler associated with the data |
| * Data - Where the data is returned |
| * |
| * RETURN: Status |
| * |
| * DESCRIPTION: Low level interface to obtain data previously associated with |
| * a namespace node. |
| * |
| ******************************************************************************/ |
| |
| acpi_status |
| acpi_ns_get_attached_data(struct acpi_namespace_node * node, |
| acpi_object_handler handler, void **data) |
| { |
| union acpi_operand_object *obj_desc; |
| |
| obj_desc = node->object; |
| while (obj_desc) { |
| if ((ACPI_GET_OBJECT_TYPE(obj_desc) == ACPI_TYPE_LOCAL_DATA) && |
| (obj_desc->data.handler == handler)) { |
| *data = obj_desc->data.pointer; |
| return (AE_OK); |
| } |
| |
| obj_desc = obj_desc->common.next_object; |
| } |
| |
| return (AE_NOT_FOUND); |
| } |