1 files changed, 381 insertions, 0 deletions
diff --git a/drivers/acpi/namespace/nssearch.c b/drivers/acpi/namespace/nssearch.c
new file mode 100644
index 000000000000..0e6dea23603b
--- /dev/null
+++ b/drivers/acpi/namespace/nssearch.c
@@ -0,0 +1,381 @@
+/*******************************************************************************
+ *
+ * Module Name: nssearch - Namespace search
+ *
+ ******************************************************************************/
+
+/*
+ * 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    ("nssearch")
+
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ns_search_node
+ *
+ * PARAMETERS:  *target_name        - Ascii ACPI name to search for
+ *              *Node               - Starting node where search will begin
+ *              Type                - Object type to match
+ *              **return_node       - Where the matched Named obj is returned
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Search a single level of the namespace.  Performs a
+ *              simple search of the specified level, and does not add
+ *              entries or search parents.
+ *
+ *
+ *      Named object lists are built (and subsequently dumped) in the
+ *      order in which the names are encountered during the namespace load;
+ *
+ *      All namespace searching is linear in this implementation, but
+ *      could be easily modified to support any improved search
+ *      algorithm.  However, the linear search was chosen for simplicity
+ *      and because the trees are small and the other interpreter
+ *      execution overhead is relatively high.
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_ns_search_node (
+	u32                             target_name,
+	struct acpi_namespace_node      *node,
+	acpi_object_type                type,
+	struct acpi_namespace_node      **return_node)
+{
+	struct acpi_namespace_node      *next_node;
+
+
+	ACPI_FUNCTION_TRACE ("ns_search_node");
+
+
+#ifdef ACPI_DEBUG_OUTPUT
+	if (ACPI_LV_NAMES & acpi_dbg_level) {
+		char                        *scope_name;
+
+		scope_name = acpi_ns_get_external_pathname (node);
+		if (scope_name) {
+			ACPI_DEBUG_PRINT ((ACPI_DB_NAMES,
+				"Searching %s (%p) For [%4.4s] (%s)\n",
+				scope_name, node, (char *) &target_name,
+				acpi_ut_get_type_name (type)));
+
+			ACPI_MEM_FREE (scope_name);
+		}
+	}
+#endif
+
+	/*
+	 * Search for name at this namespace level, which is to say that we
+	 * must search for the name among the children of this object
+	 */
+	next_node = node->child;
+	while (next_node) {
+		/* Check for match against the name */
+
+		if (next_node->name.integer == target_name) {
+			/* Resolve a control method alias if any */
+
+			if (acpi_ns_get_type (next_node) == ACPI_TYPE_LOCAL_METHOD_ALIAS) {
+				next_node = ACPI_CAST_PTR (struct acpi_namespace_node, next_node->object);
+			}
+
+			/*
+			 * Found matching entry.
+			 */
+			ACPI_DEBUG_PRINT ((ACPI_DB_NAMES,
+				"Name [%4.4s] (%s) %p found in scope [%4.4s] %p\n",
+				(char *) &target_name, acpi_ut_get_type_name (next_node->type),
+				next_node, acpi_ut_get_node_name (node), node));
+
+			*return_node = next_node;
+			return_ACPI_STATUS (AE_OK);
+		}
+
+		/*
+		 * The last entry in the list points back to the parent,
+		 * so a flag is used to indicate the end-of-list
+		 */
+		if (next_node->flags & ANOBJ_END_OF_PEER_LIST) {
+			/* Searched entire list, we are done */
+
+			break;
+		}
+
+		/* Didn't match name, move on to the next peer object */
+
+		next_node = next_node->peer;
+	}
+
+	/* Searched entire namespace level, not found */
+
+	ACPI_DEBUG_PRINT ((ACPI_DB_NAMES,
+		"Name [%4.4s] (%s) not found in search in scope [%4.4s] %p first child %p\n",
+		(char *) &target_name, acpi_ut_get_type_name (type),
+		acpi_ut_get_node_name (node), node, node->child));
+
+	return_ACPI_STATUS (AE_NOT_FOUND);
+}
+
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ns_search_parent_tree
+ *
+ * PARAMETERS:  *target_name        - Ascii ACPI name to search for
+ *              *Node               - Starting node where search will begin
+ *              Type                - Object type to match
+ *              **return_node       - Where the matched Node is returned
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Called when a name has not been found in the current namespace
+ *              level.  Before adding it or giving up, ACPI scope rules require
+ *              searching enclosing scopes in cases identified by acpi_ns_local().
+ *
+ *              "A name is located by finding the matching name in the current
+ *              name space, and then in the parent name space. If the parent
+ *              name space does not contain the name, the search continues
+ *              recursively until either the name is found or the name space
+ *              does not have a parent (the root of the name space).  This
+ *              indicates that the name is not found" (From ACPI Specification,
+ *              section 5.3)
+ *
+ ******************************************************************************/
+
+static acpi_status
+acpi_ns_search_parent_tree (
+	u32                             target_name,
+	struct acpi_namespace_node      *node,
+	acpi_object_type                type,
+	struct acpi_namespace_node      **return_node)
+{
+	acpi_status                     status;
+	struct acpi_namespace_node      *parent_node;
+
+
+	ACPI_FUNCTION_TRACE ("ns_search_parent_tree");
+
+
+	parent_node = acpi_ns_get_parent_node (node);
+
+	/*
+	 * If there is no parent (i.e., we are at the root) or type is "local",
+	 * we won't be searching the parent tree.
+	 */
+	if (!parent_node) {
+		ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, "[%4.4s] has no parent\n",
+			(char *) &target_name));
+		return_ACPI_STATUS (AE_NOT_FOUND);
+	}
+
+	if (acpi_ns_local (type)) {
+		ACPI_DEBUG_PRINT ((ACPI_DB_NAMES,
+			"[%4.4s] type [%s] must be local to this scope (no parent search)\n",
+			(char *) &target_name, acpi_ut_get_type_name (type)));
+		return_ACPI_STATUS (AE_NOT_FOUND);
+	}
+
+	/* Search the parent tree */
+
+	ACPI_DEBUG_PRINT ((ACPI_DB_NAMES,
+		"Searching parent [%4.4s] for [%4.4s]\n",
+		acpi_ut_get_node_name (parent_node), (char *) &target_name));
+
+	/*
+	 * Search parents until target is found or we have backed up to the root
+	 */
+	while (parent_node) {
+		/*
+		 * Search parent scope.  Use TYPE_ANY because we don't care about the
+		 * object type at this point, we only care about the existence of
+		 * the actual name we are searching for.  Typechecking comes later.
+		 */
+		status = acpi_ns_search_node (target_name, parent_node,
+				  ACPI_TYPE_ANY, return_node);
+		if (ACPI_SUCCESS (status)) {
+			return_ACPI_STATUS (status);
+		}
+
+		/*
+		 * Not found here, go up another level
+		 * (until we reach the root)
+		 */
+		parent_node = acpi_ns_get_parent_node (parent_node);
+	}
+
+	/* Not found in parent tree */
+
+	return_ACPI_STATUS (AE_NOT_FOUND);
+}
+
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ns_search_and_enter
+ *
+ * PARAMETERS:  target_name         - Ascii ACPI name to search for (4 chars)
+ *              walk_state          - Current state of the walk
+ *              *Node               - Starting node where search will begin
+ *              interpreter_mode    - Add names only in ACPI_MODE_LOAD_PASS_x.
+ *                                    Otherwise,search only.
+ *              Type                - Object type to match
+ *              Flags               - Flags describing the search restrictions
+ *              **return_node       - Where the Node is returned
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Search for a name segment in a single namespace level,
+ *              optionally adding it if it is not found.  If the passed
+ *              Type is not Any and the type previously stored in the
+ *              entry was Any (i.e. unknown), update the stored type.
+ *
+ *              In ACPI_IMODE_EXECUTE, search only.
+ *              In other modes, search and add if not found.
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_ns_search_and_enter (
+	u32                             target_name,
+	struct acpi_walk_state          *walk_state,
+	struct acpi_namespace_node      *node,
+	acpi_interpreter_mode           interpreter_mode,
+	acpi_object_type                type,
+	u32                             flags,
+	struct acpi_namespace_node      **return_node)
+{
+	acpi_status                     status;
+	struct acpi_namespace_node      *new_node;
+
+
+	ACPI_FUNCTION_TRACE ("ns_search_and_enter");
+
+
+	/* Parameter validation */
+
+	if (!node || !target_name || !return_node) {
+		ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
+			"Null param: Node %p Name %X return_node %p\n",
+			node, target_name, return_node));
+
+		ACPI_REPORT_ERROR (("ns_search_and_enter: Null parameter\n"));
+		return_ACPI_STATUS (AE_BAD_PARAMETER);
+	}
+
+	/* Name must consist of printable characters */
+
+	if (!acpi_ut_valid_acpi_name (target_name)) {
+		ACPI_REPORT_ERROR (("ns_search_and_enter: Bad character in ACPI Name: %X\n",
+			target_name));
+		return_ACPI_STATUS (AE_BAD_CHARACTER);
+	}
+
+	/* Try to find the name in the namespace level specified by the caller */
+
+	*return_node = ACPI_ENTRY_NOT_FOUND;
+	status = acpi_ns_search_node (target_name, node, type, return_node);
+	if (status != AE_NOT_FOUND) {
+		/*
+		 * If we found it AND the request specifies that a find is an error,
+		 * return the error
+		 */
+		if ((status == AE_OK) &&
+			(flags & ACPI_NS_ERROR_IF_FOUND)) {
+			status = AE_ALREADY_EXISTS;
+		}
+
+		/*
+		 * Either found it or there was an error
+		 * -- finished either way
+		 */
+		return_ACPI_STATUS (status);
+	}
+
+	/*
+	 * The name was not found.  If we are NOT performing the first pass
+	 * (name entry) of loading the namespace, search the parent tree (all the
+	 * way to the root if necessary.) We don't want to perform the parent
+	 * search when the namespace is actually being loaded.  We want to perform
+	 * the search when namespace references are being resolved (load pass 2)
+	 * and during the execution phase.
+	 */
+	if ((interpreter_mode != ACPI_IMODE_LOAD_PASS1) &&
+		(flags & ACPI_NS_SEARCH_PARENT)) {
+		/*
+		 * Not found at this level - search parent tree according to the
+		 * ACPI specification
+		 */
+		status = acpi_ns_search_parent_tree (target_name, node, type, return_node);
+		if (ACPI_SUCCESS (status)) {
+			return_ACPI_STATUS (status);
+		}
+	}
+
+	/*
+	 * In execute mode, just search, never add names.  Exit now.
+	 */
+	if (interpreter_mode == ACPI_IMODE_EXECUTE) {
+		ACPI_DEBUG_PRINT ((ACPI_DB_NAMES,
+			"%4.4s Not found in %p [Not adding]\n",
+			(char *) &target_name, node));
+
+		return_ACPI_STATUS (AE_NOT_FOUND);
+	}
+
+	/* Create the new named object */
+
+	new_node = acpi_ns_create_node (target_name);
+	if (!new_node) {
+		return_ACPI_STATUS (AE_NO_MEMORY);
+	}
+
+	/* Install the new object into the parent's list of children */
+
+	acpi_ns_install_node (walk_state, node, new_node, type);
+	*return_node = new_node;
+
+	return_ACPI_STATUS (AE_OK);
+}
+