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c501d8112c
svn path=/branches/aicom-network-fixes/; revision=34994
295 lines
7.7 KiB
C
295 lines
7.7 KiB
C
/******************************************************************************
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*
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* Module Name: nsxfname - Public interfaces to the ACPI subsystem
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* ACPI Namespace oriented interfaces
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* $Revision: 1.1 $
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*
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*****************************************************************************/
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/*
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* Copyright (C) 2000, 2001 R. Byron Moore
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <acpi.h>
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#define _COMPONENT ACPI_NAMESPACE
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MODULE_NAME ("nsxfname")
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/****************************************************************************
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*
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* FUNCTION: Acpi_get_handle
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*
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* PARAMETERS: Parent - Object to search under (search scope).
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* Path_name - Pointer to an asciiz string containing the
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* name
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* Ret_handle - Where the return handle is placed
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*
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* RETURN: Status
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*
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* DESCRIPTION: This routine will search for a caller specified name in the
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* name space. The caller can restrict the search region by
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* specifying a non NULL parent. The parent value is itself a
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* namespace handle.
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*
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******************************************************************************/
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ACPI_STATUS
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acpi_get_handle (
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ACPI_HANDLE parent,
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ACPI_STRING pathname,
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ACPI_HANDLE *ret_handle)
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{
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ACPI_STATUS status;
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ACPI_NAMESPACE_NODE *node = NULL;
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ACPI_NAMESPACE_NODE *prefix_node = NULL;
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if (!ret_handle || !pathname) {
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return (AE_BAD_PARAMETER);
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}
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/* Convert a parent handle to a prefix node */
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if (parent) {
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acpi_cm_acquire_mutex (ACPI_MTX_NAMESPACE);
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prefix_node = acpi_ns_convert_handle_to_entry (parent);
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if (!prefix_node) {
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acpi_cm_release_mutex (ACPI_MTX_NAMESPACE);
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return (AE_BAD_PARAMETER);
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}
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acpi_cm_release_mutex (ACPI_MTX_NAMESPACE);
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}
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/* Special case for root, since we can't search for it */
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if (STRCMP (pathname, NS_ROOT_PATH) == 0) {
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*ret_handle = acpi_ns_convert_entry_to_handle (acpi_gbl_root_node);
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return (AE_OK);
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}
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/*
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* Find the Node and convert to a handle
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*/
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status = acpi_ns_get_node (pathname, prefix_node, &node);
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*ret_handle = NULL;
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if (ACPI_SUCCESS (status)) {
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*ret_handle = acpi_ns_convert_entry_to_handle (node);
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}
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return (status);
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}
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/****************************************************************************
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*
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* FUNCTION: Acpi_get_pathname
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*
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* PARAMETERS: Handle - Handle to be converted to a pathname
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* Name_type - Full pathname or single segment
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* Ret_path_ptr - Buffer for returned path
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*
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* RETURN: Pointer to a string containing the fully qualified Name.
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*
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* DESCRIPTION: This routine returns the fully qualified name associated with
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* the Handle parameter. This and the Acpi_pathname_to_handle are
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* complementary functions.
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*
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******************************************************************************/
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ACPI_STATUS
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acpi_get_name (
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ACPI_HANDLE handle,
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u32 name_type,
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ACPI_BUFFER *ret_path_ptr)
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{
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ACPI_STATUS status;
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ACPI_NAMESPACE_NODE *node;
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/* Buffer pointer must be valid always */
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if (!ret_path_ptr || (name_type > ACPI_NAME_TYPE_MAX)) {
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return (AE_BAD_PARAMETER);
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}
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/* Allow length to be zero and ignore the pointer */
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if ((ret_path_ptr->length) &&
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(!ret_path_ptr->pointer)) {
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return (AE_BAD_PARAMETER);
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}
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if (name_type == ACPI_FULL_PATHNAME) {
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/* Get the full pathname (From the namespace root) */
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status = acpi_ns_handle_to_pathname (handle, &ret_path_ptr->length,
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ret_path_ptr->pointer);
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return (status);
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}
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/*
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* Wants the single segment ACPI name.
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* Validate handle and convert to an Node
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*/
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acpi_cm_acquire_mutex (ACPI_MTX_NAMESPACE);
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node = acpi_ns_convert_handle_to_entry (handle);
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if (!node) {
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status = AE_BAD_PARAMETER;
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goto unlock_and_exit;
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}
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/* Check if name will fit in buffer */
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if (ret_path_ptr->length < PATH_SEGMENT_LENGTH) {
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ret_path_ptr->length = PATH_SEGMENT_LENGTH;
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status = AE_BUFFER_OVERFLOW;
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goto unlock_and_exit;
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}
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/* Just copy the ACPI name from the Node and zero terminate it */
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STRNCPY (ret_path_ptr->pointer, (NATIVE_CHAR *) &node->name,
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ACPI_NAME_SIZE);
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((NATIVE_CHAR *) ret_path_ptr->pointer) [ACPI_NAME_SIZE] = 0;
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status = AE_OK;
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unlock_and_exit:
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acpi_cm_release_mutex (ACPI_MTX_NAMESPACE);
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return (status);
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}
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/****************************************************************************
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*
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* FUNCTION: Acpi_get_object_info
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*
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* PARAMETERS: Handle - Object Handle
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* Info - Where the info is returned
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*
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* RETURN: Status
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*
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* DESCRIPTION: Returns information about an object as gleaned from the
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* namespace node and possibly by running several standard
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* control methods (Such as in the case of a device.)
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*
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******************************************************************************/
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ACPI_STATUS
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acpi_get_object_info (
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ACPI_HANDLE handle,
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ACPI_DEVICE_INFO *info)
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{
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DEVICE_ID hid;
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DEVICE_ID uid;
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ACPI_STATUS status;
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u32 device_status = 0;
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ACPI_INTEGER address = 0;
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ACPI_NAMESPACE_NODE *node;
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/* Parameter validation */
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if (!handle || !info) {
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return (AE_BAD_PARAMETER);
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}
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acpi_cm_acquire_mutex (ACPI_MTX_NAMESPACE);
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node = acpi_ns_convert_handle_to_entry (handle);
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if (!node) {
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acpi_cm_release_mutex (ACPI_MTX_NAMESPACE);
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return (AE_BAD_PARAMETER);
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}
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info->type = node->type;
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info->name = node->name;
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acpi_cm_release_mutex (ACPI_MTX_NAMESPACE);
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/*
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* If not a device, we are all done.
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*/
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if (info->type != ACPI_TYPE_DEVICE) {
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return (AE_OK);
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}
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/*
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* Get extra info for ACPI devices only. Run the
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* _HID, _UID, _STA, and _ADR methods. Note: none
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* of these methods are required, so they may or may
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* not be present. The Info->Valid bits are used
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* to indicate which methods ran successfully.
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*/
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info->valid = 0;
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/* Execute the _HID method and save the result */
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status = acpi_cm_execute_HID (node, &hid);
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if (ACPI_SUCCESS (status)) {
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STRNCPY (info->hardware_id, hid.buffer, sizeof(info->hardware_id));
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info->valid |= ACPI_VALID_HID;
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}
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/* Execute the _UID method and save the result */
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status = acpi_cm_execute_UID (node, &uid);
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if (ACPI_SUCCESS (status)) {
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STRCPY (info->unique_id, uid.buffer);
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info->valid |= ACPI_VALID_UID;
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}
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/*
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* Execute the _STA method and save the result
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* _STA is not always present
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*/
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status = acpi_cm_execute_STA (node, &device_status);
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if (ACPI_SUCCESS (status)) {
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info->current_status = device_status;
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info->valid |= ACPI_VALID_STA;
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}
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/*
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* Execute the _ADR method and save result if successful
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* _ADR is not always present
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*/
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status = acpi_cm_evaluate_numeric_object (METHOD_NAME__ADR,
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node, &address);
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if (ACPI_SUCCESS (status)) {
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info->address = address;
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info->valid |= ACPI_VALID_ADR;
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}
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return (AE_OK);
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}
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