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Diffstat (limited to 'drivers/acpi/namespace/nsobject.c')
-rw-r--r--drivers/acpi/namespace/nsobject.c461
1 files changed, 461 insertions, 0 deletions
diff --git a/drivers/acpi/namespace/nsobject.c b/drivers/acpi/namespace/nsobject.c
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index 000000000000..4e41e66db61f
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+++ b/drivers/acpi/namespace/nsobject.c
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+/*******************************************************************************
+ *
+ * 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);
+}
+
+
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