361 lines
10 KiB
C
361 lines
10 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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*
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*****************************************************************************/
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/*
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* Copyright (C) 2000 - 2008, Intel Corp.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions, and the following disclaimer,
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* without modification.
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* 2. Redistributions in binary form must reproduce at minimum a disclaimer
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* substantially similar to the "NO WARRANTY" disclaimer below
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* ("Disclaimer") and any redistribution must be conditioned upon
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* including a substantially similar Disclaimer requirement for further
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* binary redistribution.
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* 3. Neither the names of the above-listed copyright holders nor the names
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* of any contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* Alternatively, this software may be distributed under the terms of the
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* GNU General Public License ("GPL") version 2 as published by the Free
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* Software Foundation.
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*
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* NO WARRANTY
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGES.
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*/
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#include <acpi/acpi.h>
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#include "accommon.h"
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#include "acnamesp.h"
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#define _COMPONENT ACPI_NAMESPACE
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ACPI_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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* Pathname - Pointer to an asciiz string containing the
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* name
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* ret_handle - Where the return handle is returned
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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(acpi_handle parent,
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acpi_string pathname, acpi_handle * ret_handle)
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{
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acpi_status status;
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struct acpi_namespace_node *node = NULL;
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struct acpi_namespace_node *prefix_node = NULL;
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ACPI_FUNCTION_ENTRY();
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/* Parameter Validation */
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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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prefix_node = acpi_ns_map_handle_to_node(parent);
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if (!prefix_node) {
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return (AE_BAD_PARAMETER);
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}
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}
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/*
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* Valid cases are:
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* 1) Fully qualified pathname
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* 2) Parent + Relative pathname
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*
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* Error for <null Parent + relative path>
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*/
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if (acpi_ns_valid_root_prefix(pathname[0])) {
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/* Pathname is fully qualified (starts with '\') */
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/* Special case for root-only, since we can't search for it */
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if (!ACPI_STRCMP(pathname, ACPI_NS_ROOT_PATH)) {
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*ret_handle =
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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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} else if (!prefix_node) {
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/* Relative path with null prefix is disallowed */
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return (AE_BAD_PARAMETER);
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}
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/* Find the Node and convert to a handle */
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status =
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acpi_ns_get_node(prefix_node, pathname, ACPI_NS_NO_UPSEARCH, &node);
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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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ACPI_EXPORT_SYMBOL(acpi_get_handle)
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/******************************************************************************
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*
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* FUNCTION: acpi_get_name
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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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* Buffer - 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(acpi_handle handle, u32 name_type, struct acpi_buffer * buffer)
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{
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acpi_status status;
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struct acpi_namespace_node *node;
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/* Parameter validation */
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if (name_type > ACPI_NAME_TYPE_MAX) {
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return (AE_BAD_PARAMETER);
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}
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status = acpi_ut_validate_buffer(buffer);
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if (ACPI_FAILURE(status)) {
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return (status);
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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, buffer);
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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 a namespace Node
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*/
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status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
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if (ACPI_FAILURE(status)) {
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return (status);
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}
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node = acpi_ns_map_handle_to_node(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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/* Validate/Allocate/Clear caller buffer */
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status = acpi_ut_initialize_buffer(buffer, ACPI_PATH_SEGMENT_LENGTH);
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if (ACPI_FAILURE(status)) {
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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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ACPI_STRNCPY(buffer->pointer, acpi_ut_get_node_name(node),
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ACPI_NAME_SIZE);
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((char *)buffer->pointer)[ACPI_NAME_SIZE] = 0;
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status = AE_OK;
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unlock_and_exit:
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(void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
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return (status);
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}
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ACPI_EXPORT_SYMBOL(acpi_get_name)
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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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* Buffer - 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(acpi_handle handle, struct acpi_buffer * buffer)
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{
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acpi_status status;
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struct acpi_namespace_node *node;
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struct acpi_device_info *info;
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struct acpi_device_info *return_info;
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struct acpi_compatible_id_list *cid_list = NULL;
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acpi_size size;
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/* Parameter validation */
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if (!handle || !buffer) {
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return (AE_BAD_PARAMETER);
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}
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status = acpi_ut_validate_buffer(buffer);
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if (ACPI_FAILURE(status)) {
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return (status);
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}
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info = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_device_info));
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if (!info) {
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return (AE_NO_MEMORY);
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}
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status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
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if (ACPI_FAILURE(status)) {
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goto cleanup;
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}
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node = acpi_ns_map_handle_to_node(handle);
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if (!node) {
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(void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
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status = AE_BAD_PARAMETER;
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goto cleanup;
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}
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/* Init return structure */
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size = sizeof(struct acpi_device_info);
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info->type = node->type;
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info->name = node->name.integer;
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info->valid = 0;
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if (node->type == ACPI_TYPE_METHOD) {
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info->param_count = node->object->method.param_count;
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}
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status = acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
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if (ACPI_FAILURE(status)) {
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goto cleanup;
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}
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/* If not a device, we are all done */
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if (info->type == ACPI_TYPE_DEVICE) {
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/*
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* Get extra info for ACPI Devices objects only:
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* Run the Device _HID, _UID, _CID, _STA, _ADR and _sx_d methods.
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*
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* Note: none of these methods are required, so they may or may
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* not be present for this device. The Info->Valid bitfield is used
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* to indicate which methods were found and ran successfully.
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*/
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/* Execute the Device._HID method */
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status = acpi_ut_execute_HID(node, &info->hardware_id);
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if (ACPI_SUCCESS(status)) {
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info->valid |= ACPI_VALID_HID;
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}
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/* Execute the Device._UID method */
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status = acpi_ut_execute_UID(node, &info->unique_id);
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if (ACPI_SUCCESS(status)) {
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info->valid |= ACPI_VALID_UID;
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}
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/* Execute the Device._CID method */
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status = acpi_ut_execute_CID(node, &cid_list);
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if (ACPI_SUCCESS(status)) {
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size += cid_list->size;
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info->valid |= ACPI_VALID_CID;
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}
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/* Execute the Device._STA method */
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status = acpi_ut_execute_STA(node, &info->current_status);
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if (ACPI_SUCCESS(status)) {
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info->valid |= ACPI_VALID_STA;
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}
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/* Execute the Device._ADR method */
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status = acpi_ut_evaluate_numeric_object(METHOD_NAME__ADR, node,
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&info->address);
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if (ACPI_SUCCESS(status)) {
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info->valid |= ACPI_VALID_ADR;
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}
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/* Execute the Device._sx_d methods */
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status = acpi_ut_execute_sxds(node, info->highest_dstates);
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if (ACPI_SUCCESS(status)) {
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info->valid |= ACPI_VALID_SXDS;
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}
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}
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/* Validate/Allocate/Clear caller buffer */
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status = acpi_ut_initialize_buffer(buffer, size);
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if (ACPI_FAILURE(status)) {
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goto cleanup;
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}
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/* Populate the return buffer */
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return_info = buffer->pointer;
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ACPI_MEMCPY(return_info, info, sizeof(struct acpi_device_info));
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if (cid_list) {
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ACPI_MEMCPY(&return_info->compatibility_id, cid_list,
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cid_list->size);
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}
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cleanup:
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ACPI_FREE(info);
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if (cid_list) {
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ACPI_FREE(cid_list);
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}
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return (status);
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}
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ACPI_EXPORT_SYMBOL(acpi_get_object_info)
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