linux/drivers/acpi/acpica/nsnames.c

// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
/*******************************************************************************
 *
 * Module Name: nsnames - Name manipulation and search
 *
 ******************************************************************************/

#include <acpi/acpi.h>
#include "accommon.h"
#include "amlcode.h"
#include "acnamesp.h"

#define _COMPONENT …
ACPI_MODULE_NAME("nsnames")

/*******************************************************************************
 *
 * FUNCTION:    acpi_ns_get_external_pathname
 *
 * PARAMETERS:  node            - Namespace node whose pathname is needed
 *
 * RETURN:      Pointer to storage containing the fully qualified name of
 *              the node, In external format (name segments separated by path
 *              separators.)
 *
 * DESCRIPTION: Used to obtain the full pathname to a namespace node, usually
 *              for error and debug statements.
 *
 ******************************************************************************/
char *acpi_ns_get_external_pathname(struct acpi_namespace_node *node)
{ … }

/*******************************************************************************
 *
 * FUNCTION:    acpi_ns_get_pathname_length
 *
 * PARAMETERS:  node        - Namespace node
 *
 * RETURN:      Length of path, including prefix
 *
 * DESCRIPTION: Get the length of the pathname string for this node
 *
 ******************************************************************************/

acpi_size acpi_ns_get_pathname_length(struct acpi_namespace_node *node)
{ … }

/*******************************************************************************
 *
 * FUNCTION:    acpi_ns_handle_to_name
 *
 * PARAMETERS:  target_handle           - Handle of named object whose name is
 *                                        to be found
 *              buffer                  - Where the name is returned
 *
 * RETURN:      Status, Buffer is filled with name if status is AE_OK
 *
 * DESCRIPTION: Build and return a full namespace name
 *
 ******************************************************************************/

acpi_status
acpi_ns_handle_to_name(acpi_handle target_handle, struct acpi_buffer *buffer)
{ … }

/*******************************************************************************
 *
 * FUNCTION:    acpi_ns_handle_to_pathname
 *
 * PARAMETERS:  target_handle           - Handle of named object whose name is
 *                                        to be found
 *              buffer                  - Where the pathname is returned
 *              no_trailing             - Remove trailing '_' for each name
 *                                        segment
 *
 * RETURN:      Status, Buffer is filled with pathname if status is AE_OK
 *
 * DESCRIPTION: Build and return a full namespace pathname
 *
 ******************************************************************************/

acpi_status
acpi_ns_handle_to_pathname(acpi_handle target_handle,
			   struct acpi_buffer *buffer, u8 no_trailing)
{ … }

/*******************************************************************************
 *
 * FUNCTION:    acpi_ns_build_normalized_path
 *
 * PARAMETERS:  node        - Namespace node
 *              full_path   - Where the path name is returned
 *              path_size   - Size of returned path name buffer
 *              no_trailing - Remove trailing '_' from each name segment
 *
 * RETURN:      Return 1 if the AML path is empty, otherwise returning (length
 *              of pathname + 1) which means the 'FullPath' contains a trailing
 *              null.
 *
 * DESCRIPTION: Build and return a full namespace pathname.
 *              Note that if the size of 'FullPath' isn't large enough to
 *              contain the namespace node's path name, the actual required
 *              buffer length is returned, and it should be greater than
 *              'PathSize'. So callers are able to check the returning value
 *              to determine the buffer size of 'FullPath'.
 *
 ******************************************************************************/

u32
acpi_ns_build_normalized_path(struct acpi_namespace_node *node,
			      char *full_path, u32 path_size, u8 no_trailing)
{ … }

/*******************************************************************************
 *
 * FUNCTION:    acpi_ns_get_normalized_pathname
 *
 * PARAMETERS:  node            - Namespace node whose pathname is needed
 *              no_trailing     - Remove trailing '_' from each name segment
 *
 * RETURN:      Pointer to storage containing the fully qualified name of
 *              the node, In external format (name segments separated by path
 *              separators.)
 *
 * DESCRIPTION: Used to obtain the full pathname to a namespace node, usually
 *              for error and debug statements. All trailing '_' will be
 *              removed from the full pathname if 'NoTrailing' is specified..
 *
 ******************************************************************************/

char *acpi_ns_get_normalized_pathname(struct acpi_namespace_node *node,
				      u8 no_trailing)
{ … }

/*******************************************************************************
 *
 * FUNCTION:    acpi_ns_build_prefixed_pathname
 *
 * PARAMETERS:  prefix_scope        - Scope/Path that prefixes the internal path
 *              internal_path       - Name or path of the namespace node
 *
 * RETURN:      None
 *
 * DESCRIPTION: Construct a fully qualified pathname from a concatenation of:
 *              1) Path associated with the prefix_scope namespace node
 *              2) External path representation of the Internal path
 *
 ******************************************************************************/

char *acpi_ns_build_prefixed_pathname(union acpi_generic_state *prefix_scope,
				      const char *internal_path)
{ … }

/*******************************************************************************
 *
 * FUNCTION:    acpi_ns_normalize_pathname
 *
 * PARAMETERS:  original_path       - Path to be normalized, in External format
 *
 * RETURN:      The original path is processed in-place
 *
 * DESCRIPTION: Remove trailing underscores from each element of a path.
 *
 *              For example:  \A___.B___.C___ becomes \A.B.C
 *
 ******************************************************************************/

void acpi_ns_normalize_pathname(char *original_path)
{ … }