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/******************************************************************************
 *
 * Module Name: nsxfname - Public interfaces to the ACPI subsystem
 *                         ACPI Namespace oriented interfaces
 *
 *****************************************************************************/
 
/*
 * Copyright (C) 2000 - 2004, 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    ("nsxfname")
 
 
/******************************************************************************
 *
 * FUNCTION:    acpi_get_handle
 *
 * PARAMETERS:  Parent          - Object to search under (search scope).
 *              path_name       - Pointer to an asciiz string containing the
 *                                  name
 *              ret_handle      - Where the return handle is placed
 *
 * RETURN:      Status
 *
 * DESCRIPTION: This routine will search for a caller specified name in the
 *              name space.  The caller can restrict the search region by
 *              specifying a non NULL parent.  The parent value is itself a
 *              namespace handle.
 *
 ******************************************************************************/
 
acpi_status
acpi_get_handle (
	acpi_handle                     parent,
	acpi_string                     pathname,
	acpi_handle                     *ret_handle)
{
	acpi_status                     status;
	struct acpi_namespace_node      *node = NULL;
	struct acpi_namespace_node      *prefix_node = NULL;
 
 
	ACPI_FUNCTION_ENTRY ();
 
 
	/* Parameter Validation */
 
	if (!ret_handle || !pathname) {
		return (AE_BAD_PARAMETER);
	}
 
	/* Convert a parent handle to a prefix node */
 
	if (parent) {
		status = acpi_ut_acquire_mutex (ACPI_MTX_NAMESPACE);
		if (ACPI_FAILURE (status)) {
			return (status);
		}
 
		prefix_node = acpi_ns_map_handle_to_node (parent);
		if (!prefix_node) {
			(void) acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);
			return (AE_BAD_PARAMETER);
		}
 
		status = acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);
		if (ACPI_FAILURE (status)) {
			return (status);
		}
	}
 
	/* Special case for root, since we can't search for it */
 
	if (ACPI_STRCMP (pathname, ACPI_NS_ROOT_PATH) == 0) {
		*ret_handle = acpi_ns_convert_entry_to_handle (acpi_gbl_root_node);
		return (AE_OK);
	}
 
	/*
	 *  Find the Node and convert to a handle
	 */
	status = acpi_ns_get_node_by_path (pathname, prefix_node, ACPI_NS_NO_UPSEARCH,
			  &node);
 
	*ret_handle = NULL;
	if (ACPI_SUCCESS (status)) {
		*ret_handle = acpi_ns_convert_entry_to_handle (node);
	}
 
	return (status);
}
 
 
/******************************************************************************
 *
 * FUNCTION:    acpi_get_name
 *
 * PARAMETERS:  Handle          - Handle to be converted to a pathname
 *              name_type       - Full pathname or single segment
 *              Buffer          - Buffer for returned path
 *
 * RETURN:      Pointer to a string containing the fully qualified Name.
 *
 * DESCRIPTION: This routine returns the fully qualified name associated with
 *              the Handle parameter.  This and the acpi_pathname_to_handle are
 *              complementary functions.
 *
 ******************************************************************************/
 
acpi_status
acpi_get_name (
	acpi_handle                     handle,
	u32                             name_type,
	struct acpi_buffer              *buffer)
{
	acpi_status                     status;
	struct acpi_namespace_node      *node;
 
 
	/* Parameter validation */
 
	if (name_type > ACPI_NAME_TYPE_MAX) {
		return (AE_BAD_PARAMETER);
	}
 
	status = acpi_ut_validate_buffer (buffer);
	if (ACPI_FAILURE (status)) {
		return (status);
	}
 
	if (name_type == ACPI_FULL_PATHNAME) {
		/* Get the full pathname (From the namespace root) */
 
		status = acpi_ns_handle_to_pathname (handle, buffer);
		return (status);
	}
 
	/*
	 * Wants the single segment ACPI name.
	 * Validate handle and convert to a namespace Node
	 */
	status = acpi_ut_acquire_mutex (ACPI_MTX_NAMESPACE);
	if (ACPI_FAILURE (status)) {
		return (status);
	}
 
	node = acpi_ns_map_handle_to_node (handle);
	if (!node) {
		status = AE_BAD_PARAMETER;
		goto unlock_and_exit;
	}
 
	/* Validate/Allocate/Clear caller buffer */
 
	status = acpi_ut_initialize_buffer (buffer, ACPI_PATH_SEGMENT_LENGTH);
	if (ACPI_FAILURE (status)) {
		goto unlock_and_exit;
	}
 
	/* Just copy the ACPI name from the Node and zero terminate it */
 
	ACPI_STRNCPY (buffer->pointer, acpi_ut_get_node_name (node),
			 ACPI_NAME_SIZE);
	((char *) buffer->pointer) [ACPI_NAME_SIZE] = 0;
	status = AE_OK;
 
 
unlock_and_exit:
 
	(void) acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);
	return (status);
}
 
 
/******************************************************************************
 *
 * FUNCTION:    acpi_get_object_info
 *
 * PARAMETERS:  Handle          - Object Handle
 *              Info            - Where the info is returned
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Returns information about an object as gleaned from the
 *              namespace node and possibly by running several standard
 *              control methods (Such as in the case of a device.)
 *
 ******************************************************************************/
 
acpi_status
acpi_get_object_info (
	acpi_handle                     handle,
	struct acpi_buffer              *buffer)
{
	acpi_status                     status;
	struct acpi_namespace_node      *node;
	struct acpi_device_info         info;
	struct acpi_device_info         *return_info;
	struct acpi_compatible_id_list *cid_list = NULL;
	acpi_size                       size;
 
 
	/* Parameter validation */
 
	if (!handle || !buffer) {
		return (AE_BAD_PARAMETER);
	}
 
	status = acpi_ut_validate_buffer (buffer);
	if (ACPI_FAILURE (status)) {
		return (status);
	}
 
	status = acpi_ut_acquire_mutex (ACPI_MTX_NAMESPACE);
	if (ACPI_FAILURE (status)) {
		return (status);
	}
 
	node = acpi_ns_map_handle_to_node (handle);
	if (!node) {
		(void) acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);
		return (AE_BAD_PARAMETER);
	}
 
	/* Init return structure */
 
	size = sizeof (struct acpi_device_info);
	ACPI_MEMSET (&info, 0, size);
 
	info.type  = node->type;
	info.name  = node->name.integer;
	info.valid = 0;
 
	status = acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);
	if (ACPI_FAILURE (status)) {
		return (status);
	}
 
	/* If not a device, we are all done */
 
	if (info.type == ACPI_TYPE_DEVICE) {
		/*
		 * Get extra info for ACPI Devices objects only:
		 * Run the Device _HID, _UID, _CID, _STA, and _ADR methods.
		 *
		 * Note: none of these methods are required, so they may or may
		 * not be present for this device.  The Info.Valid bitfield is used
		 * to indicate which methods were found and ran successfully.
		 */
 
		/* Execute the Device._HID method */
 
		status = acpi_ut_execute_HID (node, &info.hardware_id);
		if (ACPI_SUCCESS (status)) {
			info.valid |= ACPI_VALID_HID;
		}
 
		/* Execute the Device._UID method */
 
		status = acpi_ut_execute_UID (node, &info.unique_id);
		if (ACPI_SUCCESS (status)) {
			info.valid |= ACPI_VALID_UID;
		}
 
		/* Execute the Device._CID method */
 
		status = acpi_ut_execute_CID (node, &cid_list);
		if (ACPI_SUCCESS (status)) {
			size += ((acpi_size) cid_list->count - 1) *
					 sizeof (struct acpi_compatible_id);
			info.valid |= ACPI_VALID_CID;
		}
 
		/* Execute the Device._STA method */
 
		status = acpi_ut_execute_STA (node, &info.current_status);
		if (ACPI_SUCCESS (status)) {
			info.valid |= ACPI_VALID_STA;
		}
 
		/* Execute the Device._ADR method */
 
		status = acpi_ut_evaluate_numeric_object (METHOD_NAME__ADR, node,
				  &info.address);
		if (ACPI_SUCCESS (status)) {
			info.valid |= ACPI_VALID_ADR;
		}
 
		/* Execute the Device._sx_d methods */
 
		status = acpi_ut_execute_sxds (node, info.highest_dstates);
		if (ACPI_SUCCESS (status)) {
			info.valid |= ACPI_VALID_STA;
		}
 
		status = AE_OK;
	}
 
	/* Validate/Allocate/Clear caller buffer */
 
	status = acpi_ut_initialize_buffer (buffer, size);
	if (ACPI_FAILURE (status)) {
		goto cleanup;
	}
 
	/* Populate the return buffer */
 
	return_info = buffer->pointer;
	ACPI_MEMCPY (return_info, &info, sizeof (struct acpi_device_info));
 
	if (cid_list) {
		ACPI_MEMCPY (&return_info->compatibility_id, cid_list, cid_list->size);
	}
 
 
cleanup:
	if (cid_list) {
		ACPI_MEM_FREE (cid_list);
	}
	return (status);
}