1 /******************************************************************************
3 * Module Name: nsxfname - Public interfaces to the ACPI subsystem
4 * ACPI Namespace oriented interfaces
6 *****************************************************************************/
9 * Copyright (C) 2000 - 2008, Intel Corp.
10 * All rights reserved.
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions, and the following disclaimer,
17 * without modification.
18 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
19 * substantially similar to the "NO WARRANTY" disclaimer below
20 * ("Disclaimer") and any redistribution must be conditioned upon
21 * including a substantially similar Disclaimer requirement for further
22 * binary redistribution.
23 * 3. Neither the names of the above-listed copyright holders nor the names
24 * of any contributors may be used to endorse or promote products derived
25 * from this software without specific prior written permission.
27 * Alternatively, this software may be distributed under the terms of the
28 * GNU General Public License ("GPL") version 2 as published by the Free
29 * Software Foundation.
32 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
33 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
34 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
35 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
36 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
37 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
38 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
39 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
40 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
41 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
42 * POSSIBILITY OF SUCH DAMAGES.
45 #include <acpi/acpi.h>
49 #define _COMPONENT ACPI_NAMESPACE
50 ACPI_MODULE_NAME("nsxfname")
52 /******************************************************************************
54 * FUNCTION: acpi_get_handle
56 * PARAMETERS: Parent - Object to search under (search scope).
57 * Pathname - Pointer to an asciiz string containing the
59 * ret_handle - Where the return handle is returned
63 * DESCRIPTION: This routine will search for a caller specified name in the
64 * name space. The caller can restrict the search region by
65 * specifying a non NULL parent. The parent value is itself a
68 ******************************************************************************/
70 acpi_get_handle(acpi_handle parent
,
71 acpi_string pathname
, acpi_handle
* ret_handle
)
74 struct acpi_namespace_node
*node
= NULL
;
75 struct acpi_namespace_node
*prefix_node
= NULL
;
77 ACPI_FUNCTION_ENTRY();
79 /* Parameter Validation */
81 if (!ret_handle
|| !pathname
) {
82 return (AE_BAD_PARAMETER
);
85 /* Convert a parent handle to a prefix node */
88 prefix_node
= acpi_ns_map_handle_to_node(parent
);
90 return (AE_BAD_PARAMETER
);
96 * 1) Fully qualified pathname
97 * 2) Parent + Relative pathname
99 * Error for <null Parent + relative path>
101 if (acpi_ns_valid_root_prefix(pathname
[0])) {
103 /* Pathname is fully qualified (starts with '\') */
105 /* Special case for root-only, since we can't search for it */
107 if (!ACPI_STRCMP(pathname
, ACPI_NS_ROOT_PATH
)) {
109 acpi_ns_convert_entry_to_handle(acpi_gbl_root_node
);
112 } else if (!prefix_node
) {
114 /* Relative path with null prefix is disallowed */
116 return (AE_BAD_PARAMETER
);
119 /* Find the Node and convert to a handle */
122 acpi_ns_get_node(prefix_node
, pathname
, ACPI_NS_NO_UPSEARCH
, &node
);
123 if (ACPI_SUCCESS(status
)) {
124 *ret_handle
= acpi_ns_convert_entry_to_handle(node
);
130 ACPI_EXPORT_SYMBOL(acpi_get_handle
)
132 /******************************************************************************
134 * FUNCTION: acpi_get_name
136 * PARAMETERS: Handle - Handle to be converted to a pathname
137 * name_type - Full pathname or single segment
138 * Buffer - Buffer for returned path
140 * RETURN: Pointer to a string containing the fully qualified Name.
142 * DESCRIPTION: This routine returns the fully qualified name associated with
143 * the Handle parameter. This and the acpi_pathname_to_handle are
144 * complementary functions.
146 ******************************************************************************/
148 acpi_get_name(acpi_handle handle
, u32 name_type
, struct acpi_buffer
* buffer
)
151 struct acpi_namespace_node
*node
;
153 /* Parameter validation */
155 if (name_type
> ACPI_NAME_TYPE_MAX
) {
156 return (AE_BAD_PARAMETER
);
159 status
= acpi_ut_validate_buffer(buffer
);
160 if (ACPI_FAILURE(status
)) {
164 if (name_type
== ACPI_FULL_PATHNAME
) {
166 /* Get the full pathname (From the namespace root) */
168 status
= acpi_ns_handle_to_pathname(handle
, buffer
);
173 * Wants the single segment ACPI name.
174 * Validate handle and convert to a namespace Node
176 status
= acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE
);
177 if (ACPI_FAILURE(status
)) {
181 node
= acpi_ns_map_handle_to_node(handle
);
183 status
= AE_BAD_PARAMETER
;
184 goto unlock_and_exit
;
187 /* Validate/Allocate/Clear caller buffer */
189 status
= acpi_ut_initialize_buffer(buffer
, ACPI_PATH_SEGMENT_LENGTH
);
190 if (ACPI_FAILURE(status
)) {
191 goto unlock_and_exit
;
194 /* Just copy the ACPI name from the Node and zero terminate it */
196 ACPI_STRNCPY(buffer
->pointer
, acpi_ut_get_node_name(node
),
198 ((char *)buffer
->pointer
)[ACPI_NAME_SIZE
] = 0;
203 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE
);
207 ACPI_EXPORT_SYMBOL(acpi_get_name
)
209 /******************************************************************************
211 * FUNCTION: acpi_get_object_info
213 * PARAMETERS: Handle - Object Handle
214 * Buffer - Where the info is returned
218 * DESCRIPTION: Returns information about an object as gleaned from the
219 * namespace node and possibly by running several standard
220 * control methods (Such as in the case of a device.)
222 ******************************************************************************/
224 acpi_get_object_info(acpi_handle handle
, struct acpi_buffer
* buffer
)
227 struct acpi_namespace_node
*node
;
228 struct acpi_device_info
*info
;
229 struct acpi_device_info
*return_info
;
230 struct acpi_compatible_id_list
*cid_list
= NULL
;
233 /* Parameter validation */
235 if (!handle
|| !buffer
) {
236 return (AE_BAD_PARAMETER
);
239 status
= acpi_ut_validate_buffer(buffer
);
240 if (ACPI_FAILURE(status
)) {
244 info
= ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_device_info
));
246 return (AE_NO_MEMORY
);
249 status
= acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE
);
250 if (ACPI_FAILURE(status
)) {
254 node
= acpi_ns_map_handle_to_node(handle
);
256 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE
);
257 status
= AE_BAD_PARAMETER
;
261 /* Init return structure */
263 size
= sizeof(struct acpi_device_info
);
265 info
->type
= node
->type
;
266 info
->name
= node
->name
.integer
;
269 if (node
->type
== ACPI_TYPE_METHOD
) {
270 info
->param_count
= node
->object
->method
.param_count
;
273 status
= acpi_ut_release_mutex(ACPI_MTX_NAMESPACE
);
274 if (ACPI_FAILURE(status
)) {
278 /* If not a device, we are all done */
280 if (info
->type
== ACPI_TYPE_DEVICE
) {
282 * Get extra info for ACPI Devices objects only:
283 * Run the Device _HID, _UID, _CID, _STA, _ADR and _sx_d methods.
285 * Note: none of these methods are required, so they may or may
286 * not be present for this device. The Info->Valid bitfield is used
287 * to indicate which methods were found and ran successfully.
290 /* Execute the Device._HID method */
292 status
= acpi_ut_execute_HID(node
, &info
->hardware_id
);
293 if (ACPI_SUCCESS(status
)) {
294 info
->valid
|= ACPI_VALID_HID
;
297 /* Execute the Device._UID method */
299 status
= acpi_ut_execute_UID(node
, &info
->unique_id
);
300 if (ACPI_SUCCESS(status
)) {
301 info
->valid
|= ACPI_VALID_UID
;
304 /* Execute the Device._CID method */
306 status
= acpi_ut_execute_CID(node
, &cid_list
);
307 if (ACPI_SUCCESS(status
)) {
308 size
+= cid_list
->size
;
309 info
->valid
|= ACPI_VALID_CID
;
312 /* Execute the Device._STA method */
314 status
= acpi_ut_execute_STA(node
, &info
->current_status
);
315 if (ACPI_SUCCESS(status
)) {
316 info
->valid
|= ACPI_VALID_STA
;
319 /* Execute the Device._ADR method */
321 status
= acpi_ut_evaluate_numeric_object(METHOD_NAME__ADR
, node
,
323 if (ACPI_SUCCESS(status
)) {
324 info
->valid
|= ACPI_VALID_ADR
;
327 /* Execute the Device._sx_d methods */
329 status
= acpi_ut_execute_sxds(node
, info
->highest_dstates
);
330 if (ACPI_SUCCESS(status
)) {
331 info
->valid
|= ACPI_VALID_SXDS
;
335 /* Validate/Allocate/Clear caller buffer */
337 status
= acpi_ut_initialize_buffer(buffer
, size
);
338 if (ACPI_FAILURE(status
)) {
342 /* Populate the return buffer */
344 return_info
= buffer
->pointer
;
345 ACPI_MEMCPY(return_info
, info
, sizeof(struct acpi_device_info
));
348 ACPI_MEMCPY(&return_info
->compatibility_id
, cid_list
,
360 ACPI_EXPORT_SYMBOL(acpi_get_object_info
)
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