diff options
Diffstat (limited to 'drivers/acpi/namespace/nsobject.c')
| -rw-r--r-- | drivers/acpi/namespace/nsobject.c | 461 |
1 files changed, 461 insertions, 0 deletions
diff --git a/drivers/acpi/namespace/nsobject.c b/drivers/acpi/namespace/nsobject.c new file mode 100644 index 000000000000..4e41e66db61f --- /dev/null +++ b/drivers/acpi/namespace/nsobject.c @@ -0,0 +1,461 @@ +/******************************************************************************* + * + * Module Name: nsobject - Utilities for objects attached to namespace + * table entries + * + ******************************************************************************/ + +/* + * Copyright (C) 2000 - 2005, R. Byron Moore + * 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/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 + * + * 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_REPORT_ERROR (("ns_attach_object: Null named_obj handle\n")); + return_ACPI_STATUS (AE_BAD_PARAMETER); + } + + if (!object && (ACPI_TYPE_ANY != type)) { + /* Null object */ + + ACPI_REPORT_ERROR (("ns_attach_object: Null object, but type not ACPI_TYPE_ANY\n")); + return_ACPI_STATUS (AE_BAD_PARAMETER); + } + + if (ACPI_GET_DESCRIPTOR_TYPE (node) != ACPI_DESC_TYPE_NAMED) { + /* Not a name handle */ + + ACPI_REPORT_ERROR (("ns_attach_object: Invalid handle %p [%s]\n", + 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 name_obj %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 - An 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 - Parent Node to be examined + * + * 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_DEBUG_PRINT ((ACPI_DB_WARN, "Null Node ptr\n")); + 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 - Parent Node to be examined + * + * 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); +} + + |
