diff options
Diffstat (limited to 'drivers/acpi/acpica/nsnames.c')
| -rw-r--r-- | drivers/acpi/acpica/nsnames.c | 149 |
1 files changed, 149 insertions, 0 deletions
diff --git a/drivers/acpi/acpica/nsnames.c b/drivers/acpi/acpica/nsnames.c index a410760a0308..22c92d1a24d8 100644 --- a/drivers/acpi/acpica/nsnames.c +++ b/drivers/acpi/acpica/nsnames.c @@ -49,6 +49,9 @@ #define _COMPONENT ACPI_NAMESPACE ACPI_MODULE_NAME("nsnames") +/* Local Prototypes */ +static void acpi_ns_normalize_pathname(char *original_path); + /******************************************************************************* * * FUNCTION: acpi_ns_get_external_pathname @@ -63,6 +66,7 @@ ACPI_MODULE_NAME("nsnames") * for error and debug statements. * ******************************************************************************/ + char *acpi_ns_get_external_pathname(struct acpi_namespace_node *node) { char *name_buffer; @@ -352,3 +356,148 @@ char *acpi_ns_get_normalized_pathname(struct acpi_namespace_node *node, return_PTR(name_buffer); } + +/******************************************************************************* + * + * 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) +{ + acpi_status status; + char *full_path = NULL; + char *external_path = NULL; + char *prefix_path = NULL; + u32 prefix_path_length = 0; + + /* If there is a prefix, get the pathname to it */ + + if (prefix_scope && prefix_scope->scope.node) { + prefix_path = + acpi_ns_get_normalized_pathname(prefix_scope->scope.node, + TRUE); + if (prefix_path) { + prefix_path_length = strlen(prefix_path); + } + } + + status = acpi_ns_externalize_name(ACPI_UINT32_MAX, internal_path, + NULL, &external_path); + if (ACPI_FAILURE(status)) { + goto cleanup; + } + + /* Merge the prefix path and the path. 2 is for one dot and trailing null */ + + full_path = + ACPI_ALLOCATE_ZEROED(prefix_path_length + strlen(external_path) + + 2); + if (!full_path) { + goto cleanup; + } + + /* Don't merge if the External path is already fully qualified */ + + if (prefix_path && (*external_path != '\\') && (*external_path != '^')) { + strcat(full_path, prefix_path); + if (prefix_path[1]) { + strcat(full_path, "."); + } + } + + acpi_ns_normalize_pathname(external_path); + strcat(full_path, external_path); + +cleanup: + if (prefix_path) { + ACPI_FREE(prefix_path); + } + if (external_path) { + ACPI_FREE(external_path); + } + + return (full_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 + * + ******************************************************************************/ + +static void acpi_ns_normalize_pathname(char *original_path) +{ + char *input_path = original_path; + char *new_path_buffer; + char *new_path; + u32 i; + + /* Allocate a temp buffer in which to construct the new path */ + + new_path_buffer = ACPI_ALLOCATE_ZEROED(strlen(input_path) + 1); + new_path = new_path_buffer; + if (!new_path_buffer) { + return; + } + + /* Special characters may appear at the beginning of the path */ + + if (*input_path == '\\') { + *new_path = *input_path; + new_path++; + input_path++; + } + + while (*input_path == '^') { + *new_path = *input_path; + new_path++; + input_path++; + } + + /* Remainder of the path */ + + while (*input_path) { + + /* Do one nameseg at a time */ + + for (i = 0; (i < ACPI_NAME_SIZE) && *input_path; i++) { + if ((i == 0) || (*input_path != '_')) { /* First char is allowed to be underscore */ + *new_path = *input_path; + new_path++; + } + + input_path++; + } + + /* Dot means that there are more namesegs to come */ + + if (*input_path == '.') { + *new_path = *input_path; + new_path++; + input_path++; + } + } + + *new_path = 0; + strcpy(original_path, new_path_buffer); + ACPI_FREE(new_path_buffer); +} |