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/******************************************************************************
*
* Module Name: nsxfname - Public interfaces to the ACPI subsystem
* ACPI Namespace oriented interfaces
* $Revision: 82 $
*
*****************************************************************************/
/*
* Copyright (C) 2000, 2001 R. Byron Moore
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "acpi.h"
#include "acinterp.h"
#include "acnamesp.h"
#include "amlcode.h"
#include "acparser.h"
#include "acdispat.h"
#include "acevents.h"
#define _COMPONENT ACPI_NAMESPACE
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;
acpi_namespace_node *node = NULL;
acpi_namespace_node *prefix_node = NULL;
FUNCTION_ENTRY ();
/* Parameter Validation */
if (!ret_handle || !pathname) {
return (AE_BAD_PARAMETER);
}
/* Convert a parent handle to a prefix node */
if (parent) {
acpi_ut_acquire_mutex (ACPI_MTX_NAMESPACE);
prefix_node = acpi_ns_map_handle_to_node (parent);
if (!prefix_node) {
acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);
return (AE_BAD_PARAMETER);
}
acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);
}
/* Special case for root, since we can't search for it */
if (STRCMP (pathname, 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 (pathname, prefix_node, &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
* Ret_path_ptr - 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,
acpi_buffer *ret_path_ptr)
{
acpi_status status;
acpi_namespace_node *node;
/* Buffer pointer must be valid always */
if (!ret_path_ptr || (name_type > ACPI_NAME_TYPE_MAX)) {
return (AE_BAD_PARAMETER);
}
/* Allow length to be zero and ignore the pointer */
if ((ret_path_ptr->length) &&
(!ret_path_ptr->pointer)) {
return (AE_BAD_PARAMETER);
}
if (name_type == ACPI_FULL_PATHNAME) {
/* Get the full pathname (From the namespace root) */
status = acpi_ns_handle_to_pathname (handle, &ret_path_ptr->length,
ret_path_ptr->pointer);
return (status);
}
/*
* Wants the single segment ACPI name.
* Validate handle and convert to an Node
*/
acpi_ut_acquire_mutex (ACPI_MTX_NAMESPACE);
node = acpi_ns_map_handle_to_node (handle);
if (!node) {
status = AE_BAD_PARAMETER;
goto unlock_and_exit;
}
/* Check if name will fit in buffer */
if (ret_path_ptr->length < PATH_SEGMENT_LENGTH) {
ret_path_ptr->length = PATH_SEGMENT_LENGTH;
status = AE_BUFFER_OVERFLOW;
goto unlock_and_exit;
}
/* Just copy the ACPI name from the Node and zero terminate it */
STRNCPY (ret_path_ptr->pointer, (NATIVE_CHAR *) &node->name,
ACPI_NAME_SIZE);
((NATIVE_CHAR *) ret_path_ptr->pointer) [ACPI_NAME_SIZE] = 0;
status = AE_OK;
unlock_and_exit:
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,
acpi_device_info *info)
{
acpi_device_id hid;
acpi_device_id uid;
acpi_status status;
u32 device_status = 0;
acpi_integer address = 0;
acpi_namespace_node *node;
/* Parameter validation */
if (!handle || !info) {
return (AE_BAD_PARAMETER);
}
acpi_ut_acquire_mutex (ACPI_MTX_NAMESPACE);
node = acpi_ns_map_handle_to_node (handle);
if (!node) {
acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);
return (AE_BAD_PARAMETER);
}
info->type = node->type;
info->name = node->name;
acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);
/*
* If not a device, we are all done.
*/
if (info->type != ACPI_TYPE_DEVICE) {
return (AE_OK);
}
/*
* Get extra info for ACPI devices only. Run the
* _HID, _UID, _STA, and _ADR methods. Note: none
* of these methods are required, so they may or may
* not be present. The Info->Valid bits are used
* to indicate which methods ran successfully.
*/
info->valid = 0;
/* Execute the _HID method and save the result */
status = acpi_ut_execute_HID (node, &hid);
if (ACPI_SUCCESS (status)) {
STRNCPY (info->hardware_id, hid.buffer, sizeof(info->hardware_id));
info->valid |= ACPI_VALID_HID;
}
/* Execute the _UID method and save the result */
status = acpi_ut_execute_UID (node, &uid);
if (ACPI_SUCCESS (status)) {
STRCPY (info->unique_id, uid.buffer);
info->valid |= ACPI_VALID_UID;
}
/*
* Execute the _STA method and save the result
* _STA is not always present
*/
status = acpi_ut_execute_STA (node, &device_status);
if (ACPI_SUCCESS (status)) {
info->current_status = device_status;
info->valid |= ACPI_VALID_STA;
}
/*
* Execute the _ADR method and save result if successful
* _ADR is not always present
*/
status = acpi_ut_evaluate_numeric_object (METHOD_NAME__ADR,
node, &address);
if (ACPI_SUCCESS (status)) {
info->address = address;
info->valid |= ACPI_VALID_ADR;
}
return (AE_OK);
}
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