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/******************************************************************************

 *

 * Module Name: nsxfname - Public interfaces to the ACPI subsystem

 *                         ACPI Namespace oriented interfaces

 *

 *****************************************************************************/

/*

 * Copyright (C) 2000 - 2007, 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).

 *              Pathname        - Pointer to an asciiz string containing the

 *                                name

 *              ret_handle      - Where the return handle is returned

 *

 * 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) {

                prefix_node = acpi_ns_map_handle_to_node(parent);

                if (!prefix_node) {

                        return (AE_BAD_PARAMETER);

                }

        }

        /*

         * Valid cases are:

         * 1) Fully qualified pathname

         * 2) Parent + Relative pathname

         *

         * Error for <null Parent + relative path>

         */

        if (acpi_ns_valid_root_prefix(pathname[0])) {

                /* Pathname is fully qualified (starts with '\') */

                /* Special case for root-only, since we can't search for it */

                if (!ACPI_STRCMP(pathname, ACPI_NS_ROOT_PATH)) {

                        *ret_handle =

                            acpi_ns_convert_entry_to_handle(acpi_gbl_root_node);

                        return (AE_OK);

                }

        } else if (!prefix_node) {

                /* Relative path with null prefix is disallowed */

                return (AE_BAD_PARAMETER);

        }

        /* Find the Node and convert to a handle */

        status =

            acpi_ns_get_node(prefix_node, pathname, ACPI_NS_NO_UPSEARCH, &node);

        if (ACPI_SUCCESS(status)) {

                *ret_handle = acpi_ns_convert_entry_to_handle(node);

        }

        return (status);

}

ACPI_EXPORT_SYMBOL(acpi_get_handle)

/******************************************************************************

 *

 * 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);

}

ACPI_EXPORT_SYMBOL(acpi_get_name)

/******************************************************************************

 *

 * FUNCTION:    acpi_get_object_info

 *

 * PARAMETERS:  Handle          - Object Handle

 *              Buffer          - 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);

        }

        info = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_device_info));

        if (!info) {

                return (AE_NO_MEMORY);

        }

        status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);

        if (ACPI_FAILURE(status)) {

                goto cleanup;

        }

        node = acpi_ns_map_handle_to_node(handle);

        if (!node) {

                (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);

                goto cleanup;

        }

        /* Init return structure */

        size = sizeof(struct acpi_device_info);

        info->type = node->type;

        info->name = node->name.integer;

        info->valid = 0;

        status = acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);

        if (ACPI_FAILURE(status)) {

                goto cleanup;

        }

        /* 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, _ADR and _sx_d 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 += cid_list->size;

                        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_SXDS;

                }

        }

        /* 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:

        ACPI_FREE(info);

        if (cid_list) {

                ACPI_FREE(cid_list);

        }

        return (status);

}

ACPI_EXPORT_SYMBOL(acpi_get_object_info)