diff options
Diffstat (limited to 'drivers/acpi/namespace/nsutils.c')
| -rw-r--r-- | drivers/acpi/namespace/nsutils.c | 1069 |
1 files changed, 1069 insertions, 0 deletions
diff --git a/drivers/acpi/namespace/nsutils.c b/drivers/acpi/namespace/nsutils.c new file mode 100644 index 000000000000..75da76cc0b19 --- /dev/null +++ b/drivers/acpi/namespace/nsutils.c @@ -0,0 +1,1069 @@ +/****************************************************************************** + * + * Module Name: nsutils - Utilities for accessing ACPI namespace, accessing + * parents and siblings and Scope manipulation + * + *****************************************************************************/ + +/* + * 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> +#include <acpi/amlcode.h> +#include <acpi/actables.h> + +#define _COMPONENT ACPI_NAMESPACE + ACPI_MODULE_NAME ("nsutils") + + +/******************************************************************************* + * + * FUNCTION: acpi_ns_report_error + * + * PARAMETERS: module_name - Caller's module name (for error output) + * line_number - Caller's line number (for error output) + * component_id - Caller's component ID (for error output) + * Message - Error message to use on failure + * + * RETURN: None + * + * DESCRIPTION: Print warning message with full pathname + * + ******************************************************************************/ + +void +acpi_ns_report_error ( + char *module_name, + u32 line_number, + u32 component_id, + char *internal_name, + acpi_status lookup_status) +{ + acpi_status status; + char *name = NULL; + + + acpi_os_printf ("%8s-%04d: *** Error: Looking up ", + module_name, line_number); + + if (lookup_status == AE_BAD_CHARACTER) { + /* There is a non-ascii character in the name */ + + acpi_os_printf ("[0x%4.4X] (NON-ASCII)\n", + *(ACPI_CAST_PTR (u32, internal_name))); + } + else { + /* Convert path to external format */ + + status = acpi_ns_externalize_name (ACPI_UINT32_MAX, + internal_name, NULL, &name); + + /* Print target name */ + + if (ACPI_SUCCESS (status)) { + acpi_os_printf ("[%s]", name); + } + else { + acpi_os_printf ("[COULD NOT EXTERNALIZE NAME]"); + } + + if (name) { + ACPI_MEM_FREE (name); + } + } + + acpi_os_printf (" in namespace, %s\n", + acpi_format_exception (lookup_status)); +} + + +/******************************************************************************* + * + * FUNCTION: acpi_ns_report_method_error + * + * PARAMETERS: module_name - Caller's module name (for error output) + * line_number - Caller's line number (for error output) + * component_id - Caller's component ID (for error output) + * Message - Error message to use on failure + * + * RETURN: None + * + * DESCRIPTION: Print warning message with full pathname + * + ******************************************************************************/ + +void +acpi_ns_report_method_error ( + char *module_name, + u32 line_number, + u32 component_id, + char *message, + struct acpi_namespace_node *prefix_node, + char *path, + acpi_status method_status) +{ + acpi_status status; + struct acpi_namespace_node *node = prefix_node; + + + if (path) { + status = acpi_ns_get_node_by_path (path, prefix_node, + ACPI_NS_NO_UPSEARCH, &node); + if (ACPI_FAILURE (status)) { + acpi_os_printf ("report_method_error: Could not get node\n"); + return; + } + } + + acpi_os_printf ("%8s-%04d: *** Error: ", module_name, line_number); + acpi_ns_print_node_pathname (node, message); + acpi_os_printf (", %s\n", acpi_format_exception (method_status)); +} + + +/******************************************************************************* + * + * FUNCTION: acpi_ns_print_node_pathname + * + * PARAMETERS: Node - Object + * Msg - Prefix message + * + * DESCRIPTION: Print an object's full namespace pathname + * Manages allocation/freeing of a pathname buffer + * + ******************************************************************************/ + +void +acpi_ns_print_node_pathname ( + struct acpi_namespace_node *node, + char *msg) +{ + struct acpi_buffer buffer; + acpi_status status; + + + if (!node) { + acpi_os_printf ("[NULL NAME]"); + return; + } + + /* Convert handle to full pathname and print it (with supplied message) */ + + buffer.length = ACPI_ALLOCATE_LOCAL_BUFFER; + + status = acpi_ns_handle_to_pathname (node, &buffer); + if (ACPI_SUCCESS (status)) { + if (msg) { + acpi_os_printf ("%s ", msg); + } + + acpi_os_printf ("[%s] (Node %p)", (char *) buffer.pointer, node); + ACPI_MEM_FREE (buffer.pointer); + } +} + + +/******************************************************************************* + * + * FUNCTION: acpi_ns_valid_root_prefix + * + * PARAMETERS: Prefix - Character to be checked + * + * RETURN: TRUE if a valid prefix + * + * DESCRIPTION: Check if a character is a valid ACPI Root prefix + * + ******************************************************************************/ + +u8 +acpi_ns_valid_root_prefix ( + char prefix) +{ + + return ((u8) (prefix == '\\')); +} + + +/******************************************************************************* + * + * FUNCTION: acpi_ns_valid_path_separator + * + * PARAMETERS: Sep - Character to be checked + * + * RETURN: TRUE if a valid path separator + * + * DESCRIPTION: Check if a character is a valid ACPI path separator + * + ******************************************************************************/ + +u8 +acpi_ns_valid_path_separator ( + char sep) +{ + + return ((u8) (sep == '.')); +} + + +/******************************************************************************* + * + * FUNCTION: acpi_ns_get_type + * + * PARAMETERS: Handle - Parent Node to be examined + * + * RETURN: Type field from Node whose handle is passed + * + ******************************************************************************/ + +acpi_object_type +acpi_ns_get_type ( + struct acpi_namespace_node *node) +{ + ACPI_FUNCTION_TRACE ("ns_get_type"); + + + if (!node) { + ACPI_REPORT_WARNING (("ns_get_type: Null Node input pointer\n")); + return_VALUE (ACPI_TYPE_ANY); + } + + return_VALUE ((acpi_object_type) node->type); +} + + +/******************************************************************************* + * + * FUNCTION: acpi_ns_local + * + * PARAMETERS: Type - A namespace object type + * + * RETURN: LOCAL if names must be found locally in objects of the + * passed type, 0 if enclosing scopes should be searched + * + ******************************************************************************/ + +u32 +acpi_ns_local ( + acpi_object_type type) +{ + ACPI_FUNCTION_TRACE ("ns_local"); + + + if (!acpi_ut_valid_object_type (type)) { + /* Type code out of range */ + + ACPI_REPORT_WARNING (("ns_local: Invalid Object Type\n")); + return_VALUE (ACPI_NS_NORMAL); + } + + return_VALUE ((u32) acpi_gbl_ns_properties[type] & ACPI_NS_LOCAL); +} + + +/******************************************************************************* + * + * FUNCTION: acpi_ns_get_internal_name_length + * + * PARAMETERS: Info - Info struct initialized with the + * external name pointer. + * + * RETURN: Status + * + * DESCRIPTION: Calculate the length of the internal (AML) namestring + * corresponding to the external (ASL) namestring. + * + ******************************************************************************/ + +void +acpi_ns_get_internal_name_length ( + struct acpi_namestring_info *info) +{ + char *next_external_char; + u32 i; + + + ACPI_FUNCTION_ENTRY (); + + + next_external_char = info->external_name; + info->num_carats = 0; + info->num_segments = 0; + info->fully_qualified = FALSE; + + /* + * For the internal name, the required length is 4 bytes per segment, plus + * 1 each for root_prefix, multi_name_prefix_op, segment count, trailing null + * (which is not really needed, but no there's harm in putting it there) + * + * strlen() + 1 covers the first name_seg, which has no path separator + */ + if (acpi_ns_valid_root_prefix (next_external_char[0])) { + info->fully_qualified = TRUE; + next_external_char++; + } + else { + /* + * Handle Carat prefixes + */ + while (*next_external_char == '^') { + info->num_carats++; + next_external_char++; + } + } + + /* + * Determine the number of ACPI name "segments" by counting the number of + * path separators within the string. Start with one segment since the + * segment count is [(# separators) + 1], and zero separators is ok. + */ + if (*next_external_char) { + info->num_segments = 1; + for (i = 0; next_external_char[i]; i++) { + if (acpi_ns_valid_path_separator (next_external_char[i])) { + info->num_segments++; + } + } + } + + info->length = (ACPI_NAME_SIZE * info->num_segments) + + 4 + info->num_carats; + + info->next_external_char = next_external_char; +} + + +/******************************************************************************* + * + * FUNCTION: acpi_ns_build_internal_name + * + * PARAMETERS: Info - Info struct fully initialized + * + * RETURN: Status + * + * DESCRIPTION: Construct the internal (AML) namestring + * corresponding to the external (ASL) namestring. + * + ******************************************************************************/ + +acpi_status +acpi_ns_build_internal_name ( + struct acpi_namestring_info *info) +{ + u32 num_segments = info->num_segments; + char *internal_name = info->internal_name; + char *external_name = info->next_external_char; + char *result = NULL; + acpi_native_uint i; + + + ACPI_FUNCTION_TRACE ("ns_build_internal_name"); + + + /* Setup the correct prefixes, counts, and pointers */ + + if (info->fully_qualified) { + internal_name[0] = '\\'; + + if (num_segments <= 1) { + result = &internal_name[1]; + } + else if (num_segments == 2) { + internal_name[1] = AML_DUAL_NAME_PREFIX; + result = &internal_name[2]; + } + else { + internal_name[1] = AML_MULTI_NAME_PREFIX_OP; + internal_name[2] = (char) num_segments; + result = &internal_name[3]; + } + } + else { + /* + * Not fully qualified. + * Handle Carats first, then append the name segments + */ + i = 0; + if (info->num_carats) { + for (i = 0; i < info->num_carats; i++) { + internal_name[i] = '^'; + } + } + + if (num_segments <= 1) { + result = &internal_name[i]; + } + else if (num_segments == 2) { + internal_name[i] = AML_DUAL_NAME_PREFIX; + result = &internal_name[(acpi_native_uint) (i+1)]; + } + else { + internal_name[i] = AML_MULTI_NAME_PREFIX_OP; + internal_name[(acpi_native_uint) (i+1)] = (char) num_segments; + result = &internal_name[(acpi_native_uint) (i+2)]; + } + } + + /* Build the name (minus path separators) */ + + for (; num_segments; num_segments--) { + for (i = 0; i < ACPI_NAME_SIZE; i++) { + if (acpi_ns_valid_path_separator (*external_name) || + (*external_name == 0)) { + /* Pad the segment with underscore(s) if segment is short */ + + result[i] = '_'; + } + else { + /* Convert the character to uppercase and save it */ + + result[i] = (char) ACPI_TOUPPER ((int) *external_name); + external_name++; + } + } + + /* Now we must have a path separator, or the pathname is bad */ + + if (!acpi_ns_valid_path_separator (*external_name) && + (*external_name != 0)) { + return_ACPI_STATUS (AE_BAD_PARAMETER); + } + + /* Move on the next segment */ + + external_name++; + result += ACPI_NAME_SIZE; + } + + /* Terminate the string */ + + *result = 0; + + if (info->fully_qualified) { + ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Returning [%p] (abs) \"\\%s\"\n", + internal_name, internal_name)); + } + else { + ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Returning [%p] (rel) \"%s\"\n", + internal_name, internal_name)); + } + + return_ACPI_STATUS (AE_OK); +} + + +/******************************************************************************* + * + * FUNCTION: acpi_ns_internalize_name + * + * PARAMETERS: *external_name - External representation of name + * **Converted Name - Where to return the resulting + * internal represention of the name + * + * RETURN: Status + * + * DESCRIPTION: Convert an external representation (e.g. "\_PR_.CPU0") + * to internal form (e.g. 5c 2f 02 5f 50 52 5f 43 50 55 30) + * + *******************************************************************************/ + +acpi_status +acpi_ns_internalize_name ( + char *external_name, + char **converted_name) +{ + char *internal_name; + struct acpi_namestring_info info; + acpi_status status; + + + ACPI_FUNCTION_TRACE ("ns_internalize_name"); + + + if ((!external_name) || + (*external_name == 0) || + (!converted_name)) { + return_ACPI_STATUS (AE_BAD_PARAMETER); + } + + /* Get the length of the new internal name */ + + info.external_name = external_name; + acpi_ns_get_internal_name_length (&info); + + /* We need a segment to store the internal name */ + + internal_name = ACPI_MEM_CALLOCATE (info.length); + if (!internal_name) { + return_ACPI_STATUS (AE_NO_MEMORY); + } + + /* Build the name */ + + info.internal_name = internal_name; + status = acpi_ns_build_internal_name (&info); + if (ACPI_FAILURE (status)) { + ACPI_MEM_FREE (internal_name); + return_ACPI_STATUS (status); + } + + *converted_name = internal_name; + return_ACPI_STATUS (AE_OK); +} + + +/******************************************************************************* + * + * FUNCTION: acpi_ns_externalize_name + * + * PARAMETERS: *internal_name - Internal representation of name + * **converted_name - Where to return the resulting + * external representation of name + * + * RETURN: Status + * + * DESCRIPTION: Convert internal name (e.g. 5c 2f 02 5f 50 52 5f 43 50 55 30) + * to its external form (e.g. "\_PR_.CPU0") + * + ******************************************************************************/ + +acpi_status +acpi_ns_externalize_name ( + u32 internal_name_length, + char *internal_name, + u32 *converted_name_length, + char **converted_name) +{ + acpi_native_uint names_index = 0; + acpi_native_uint num_segments = 0; + acpi_native_uint required_length; + acpi_native_uint prefix_length = 0; + acpi_native_uint i = 0; + acpi_native_uint j = 0; + + + ACPI_FUNCTION_TRACE ("ns_externalize_name"); + + + if (!internal_name_length || + !internal_name || + !converted_name) { + return_ACPI_STATUS (AE_BAD_PARAMETER); + } + + /* + * Check for a prefix (one '\' | one or more '^'). + */ + switch (internal_name[0]) { + case '\\': + prefix_length = 1; + break; + + case '^': + for (i = 0; i < internal_name_length; i++) { + if (internal_name[i] == '^') { + prefix_length = i + 1; + } + else { + break; + } + } + + if (i == internal_name_length) { + prefix_length = i; + } + + break; + + default: + break; + } + + /* + * Check for object names. Note that there could be 0-255 of these + * 4-byte elements. + */ + if (prefix_length < internal_name_length) { + switch (internal_name[prefix_length]) { + case AML_MULTI_NAME_PREFIX_OP: + + /* <count> 4-byte names */ + + names_index = prefix_length + 2; + num_segments = (acpi_native_uint) (u8) + internal_name[(acpi_native_uint) (prefix_length + 1)]; + break; + + case AML_DUAL_NAME_PREFIX: + + /* Two 4-byte names */ + + names_index = prefix_length + 1; + num_segments = 2; + break; + + case 0: + + /* null_name */ + + names_index = 0; + num_segments = 0; + break; + + default: + + /* one 4-byte name */ + + names_index = prefix_length; + num_segments = 1; + break; + } + } + + /* + * Calculate the length of converted_name, which equals the length + * of the prefix, length of all object names, length of any required + * punctuation ('.') between object names, plus the NULL terminator. + */ + required_length = prefix_length + (4 * num_segments) + + ((num_segments > 0) ? (num_segments - 1) : 0) + 1; + + /* + * Check to see if we're still in bounds. If not, there's a problem + * with internal_name (invalid format). + */ + if (required_length > internal_name_length) { + ACPI_REPORT_ERROR (("ns_externalize_name: Invalid internal name\n")); + return_ACPI_STATUS (AE_BAD_PATHNAME); + } + + /* + * Build converted_name + */ + *converted_name = ACPI_MEM_CALLOCATE (required_length); + if (!(*converted_name)) { + return_ACPI_STATUS (AE_NO_MEMORY); + } + + j = 0; + + for (i = 0; i < prefix_length; i++) { + (*converted_name)[j++] = internal_name[i]; + } + + if (num_segments > 0) { + for (i = 0; i < num_segments; i++) { + if (i > 0) { + (*converted_name)[j++] = '.'; + } + + (*converted_name)[j++] = internal_name[names_index++]; + (*converted_name)[j++] = internal_name[names_index++]; + (*converted_name)[j++] = internal_name[names_index++]; + (*converted_name)[j++] = internal_name[names_index++]; + } + } + + if (converted_name_length) { + *converted_name_length = (u32) required_length; + } + + return_ACPI_STATUS (AE_OK); +} + + +/******************************************************************************* + * + * FUNCTION: acpi_ns_map_handle_to_node + * + * PARAMETERS: Handle - Handle to be converted to an Node + * + * RETURN: A Name table entry pointer + * + * DESCRIPTION: Convert a namespace handle to a real Node + * + * Note: Real integer handles allow for more verification + * and keep all pointers within this subsystem. + * + ******************************************************************************/ + +struct acpi_namespace_node * +acpi_ns_map_handle_to_node ( + acpi_handle handle) +{ + + ACPI_FUNCTION_ENTRY (); + + + /* + * Simple implementation. + */ + if (!handle) { + return (NULL); + } + + if (handle == ACPI_ROOT_OBJECT) { + return (acpi_gbl_root_node); + } + + /* We can at least attempt to verify the handle */ + + if (ACPI_GET_DESCRIPTOR_TYPE (handle) != ACPI_DESC_TYPE_NAMED) { + return (NULL); + } + + return ((struct acpi_namespace_node *) handle); +} + + +/******************************************************************************* + * + * FUNCTION: acpi_ns_convert_entry_to_handle + * + * PARAMETERS: Node - Node to be converted to a Handle + * + * RETURN: A user handle + * + * DESCRIPTION: Convert a real Node to a namespace handle + * + ******************************************************************************/ + +acpi_handle +acpi_ns_convert_entry_to_handle ( + struct acpi_namespace_node *node) +{ + + + /* + * Simple implementation for now; + */ + return ((acpi_handle) node); + + +/* --------------------------------------------------- + + if (!Node) + { + return (NULL); + } + + if (Node == acpi_gbl_root_node) + { + return (ACPI_ROOT_OBJECT); + } + + + return ((acpi_handle) Node); +------------------------------------------------------*/ +} + + +/******************************************************************************* + * + * FUNCTION: acpi_ns_terminate + * + * PARAMETERS: none + * + * RETURN: none + * + * DESCRIPTION: free memory allocated for table storage. + * + ******************************************************************************/ + +void +acpi_ns_terminate (void) +{ + union acpi_operand_object *obj_desc; + + + ACPI_FUNCTION_TRACE ("ns_terminate"); + + + /* + * 1) Free the entire namespace -- all nodes and objects + * + * Delete all object descriptors attached to namepsace nodes + */ + acpi_ns_delete_namespace_subtree (acpi_gbl_root_node); + + /* Detach any objects attached to the root */ + + obj_desc = acpi_ns_get_attached_object (acpi_gbl_root_node); + if (obj_desc) { + acpi_ns_detach_object (acpi_gbl_root_node); + } + + ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Namespace freed\n")); + + /* + * 2) Now we can delete the ACPI tables + */ + acpi_tb_delete_all_tables (); + ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "ACPI Tables freed\n")); + + return_VOID; +} + + +/******************************************************************************* + * + * FUNCTION: acpi_ns_opens_scope + * + * PARAMETERS: Type - A valid namespace type + * + * RETURN: NEWSCOPE if the passed type "opens a name scope" according + * to the ACPI specification, else 0 + * + ******************************************************************************/ + +u32 +acpi_ns_opens_scope ( + acpi_object_type type) +{ + ACPI_FUNCTION_TRACE_STR ("ns_opens_scope", acpi_ut_get_type_name (type)); + + + if (!acpi_ut_valid_object_type (type)) { + /* type code out of range */ + + ACPI_REPORT_WARNING (("ns_opens_scope: Invalid Object Type %X\n", type)); + return_VALUE (ACPI_NS_NORMAL); + } + + return_VALUE (((u32) acpi_gbl_ns_properties[type]) & ACPI_NS_NEWSCOPE); +} + + +/******************************************************************************* + * + * FUNCTION: acpi_ns_get_node_by_path + * + * PARAMETERS: *Pathname - Name to be found, in external (ASL) format. The + * \ (backslash) and ^ (carat) prefixes, and the + * . (period) to separate segments are supported. + * start_node - Root of subtree to be searched, or NS_ALL for the + * root of the name space. If Name is fully + * qualified (first s8 is '\'), the passed value + * of Scope will not be accessed. + * Flags - Used to indicate whether to perform upsearch or + * not. + * return_node - Where the Node is returned + * + * DESCRIPTION: Look up a name relative to a given scope and return the + * corresponding Node. NOTE: Scope can be null. + * + * MUTEX: Locks namespace + * + ******************************************************************************/ + +acpi_status +acpi_ns_get_node_by_path ( + char *pathname, + struct acpi_namespace_node *start_node, + u32 flags, + struct acpi_namespace_node **return_node) +{ + union acpi_generic_state scope_info; + acpi_status status; + char *internal_path = NULL; + + + ACPI_FUNCTION_TRACE_PTR ("ns_get_node_by_path", pathname); + + + if (pathname) { + /* Convert path to internal representation */ + + status = acpi_ns_internalize_name (pathname, &internal_path); + if (ACPI_FAILURE (status)) { + return_ACPI_STATUS (status); + } + } + + /* Must lock namespace during lookup */ + + status = acpi_ut_acquire_mutex (ACPI_MTX_NAMESPACE); + if (ACPI_FAILURE (status)) { + goto cleanup; + } + + /* Setup lookup scope (search starting point) */ + + scope_info.scope.node = start_node; + + /* Lookup the name in the namespace */ + + status = acpi_ns_lookup (&scope_info, internal_path, + ACPI_TYPE_ANY, ACPI_IMODE_EXECUTE, + (flags | ACPI_NS_DONT_OPEN_SCOPE), + NULL, return_node); + if (ACPI_FAILURE (status)) { + ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "%s, %s\n", + internal_path, acpi_format_exception (status))); + } + + (void) acpi_ut_release_mutex (ACPI_MTX_NAMESPACE); + +cleanup: + /* Cleanup */ + if (internal_path) { + ACPI_MEM_FREE (internal_path); + } + return_ACPI_STATUS (status); +} + + +/******************************************************************************* + * + * FUNCTION: acpi_ns_find_parent_name + * + * PARAMETERS: *child_node - Named Obj whose name is to be found + * + * RETURN: The ACPI name + * + * DESCRIPTION: Search for the given obj in its parent scope and return the + * name segment, or "????" if the parent name can't be found + * (which "should not happen"). + * + ******************************************************************************/ +#ifdef ACPI_FUTURE_USAGE +acpi_name +acpi_ns_find_parent_name ( + struct acpi_namespace_node *child_node) +{ + struct acpi_namespace_node *parent_node; + + + ACPI_FUNCTION_TRACE ("ns_find_parent_name"); + + + if (child_node) { + /* Valid entry. Get the parent Node */ + + parent_node = acpi_ns_get_parent_node (child_node); + if (parent_node) { + ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, + "Parent of %p [%4.4s] is %p [%4.4s]\n", + child_node, acpi_ut_get_node_name (child_node), + parent_node, acpi_ut_get_node_name (parent_node))); + + if (parent_node->name.integer) { + return_VALUE ((acpi_name) parent_node->name.integer); + } + } + + ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, + "Unable to find parent of %p (%4.4s)\n", + child_node, acpi_ut_get_node_name (child_node))); + } + + return_VALUE (ACPI_UNKNOWN_NAME); +} +#endif + + +/******************************************************************************* + * + * FUNCTION: acpi_ns_get_parent_node + * + * PARAMETERS: Node - Current table entry + * + * RETURN: Parent entry of the given entry + * + * DESCRIPTION: Obtain the parent entry for a given entry in the namespace. + * + ******************************************************************************/ + + +struct acpi_namespace_node * +acpi_ns_get_parent_node ( + struct acpi_namespace_node *node) +{ + ACPI_FUNCTION_ENTRY (); + + + if (!node) { + return (NULL); + } + + /* + * Walk to the end of this peer list. The last entry is marked with a flag + * and the peer pointer is really a pointer back to the parent. This saves + * putting a parent back pointer in each and every named object! + */ + while (!(node->flags & ANOBJ_END_OF_PEER_LIST)) { + node = node->peer; + } + + + return (node->peer); +} + + +/******************************************************************************* + * + * FUNCTION: acpi_ns_get_next_valid_node + * + * PARAMETERS: Node - Current table entry + * + * RETURN: Next valid Node in the linked node list. NULL if no more valid + * nodes. + * + * DESCRIPTION: Find the next valid node within a name table. + * Useful for implementing NULL-end-of-list loops. + * + ******************************************************************************/ + + +struct acpi_namespace_node * +acpi_ns_get_next_valid_node ( + struct acpi_namespace_node *node) +{ + + /* If we are at the end of this peer list, return NULL */ + + if (node->flags & ANOBJ_END_OF_PEER_LIST) { + return NULL; + } + + /* Otherwise just return the next peer */ + + return (node->peer); +} + + |