diff options
Diffstat (limited to 'drivers/acpi/acpica/nsobject.c')
| -rw-r--r-- | drivers/acpi/acpica/nsobject.c | 432 |
1 files changed, 432 insertions, 0 deletions
diff --git a/drivers/acpi/acpica/nsobject.c b/drivers/acpi/acpica/nsobject.c new file mode 100644 index 000000000..79d86da1c --- /dev/null +++ b/drivers/acpi/acpica/nsobject.c @@ -0,0 +1,432 @@ +// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0 +/******************************************************************************* + * + * Module Name: nsobject - Utilities for objects attached to namespace + * table entries + * + ******************************************************************************/ + +#include <acpi/acpi.h> +#include "accommon.h" +#include "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 || (obj_desc->common.type == ACPI_TYPE_LOCAL_DATA)) { + return_VOID; + } + + if (node->flags & ANOBJ_ALLOCATED_BUFFER) { + + /* Free the dynamic aml buffer */ + + if (obj_desc->common.type == ACPI_TYPE_METHOD) { + ACPI_FREE(obj_desc->method.aml_start); + } + } + + if (obj_desc->common.type == ACPI_TYPE_REGION) { + acpi_ut_remove_address_range(obj_desc->region.space_id, node); + } + + /* Clear the Node entry in all cases */ + + node->object = NULL; + if (ACPI_GET_DESCRIPTOR_TYPE(obj_desc) == ACPI_DESC_TYPE_OPERAND) { + + /* Unlink object from front of possible object list */ + + node->object = obj_desc->common.next_object; + + /* Handle possible 2-descriptor object */ + + if (node->object && + (node->object->common.type != ACPI_TYPE_LOCAL_DATA)) { + node->object = node->object->common.next_object; + } + + /* + * Detach the object from any data objects (which are still held by + * the namespace node) + */ + if (obj_desc->common.next_object && + ((obj_desc->common.next_object)->common.type == + ACPI_TYPE_LOCAL_DATA)) { + obj_desc->common.next_object = NULL; + } + } + + /* 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)) + || ((node->object)->common.type == 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) || + (obj_desc->common.type == ACPI_TYPE_LOCAL_DATA) || + (!obj_desc->common.next_object) || + ((obj_desc->common.next_object)->common.type == + 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 ((obj_desc->common.type == 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 ((obj_desc->common.type == 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 ((obj_desc->common.type == 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); +} |