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/drivers/acpi/namespace/nsxfobj.c

https://bitbucket.org/evzijst/gittest
C | 262 lines | 110 code | 52 blank | 100 comment | 19 complexity | aa10b2ad473712e1fad7d527d15d478e MD5 | raw file
  1/*******************************************************************************
  2 *
  3 * Module Name: nsxfobj - Public interfaces to the ACPI subsystem
  4 *                         ACPI Object oriented interfaces
  5 *
  6 ******************************************************************************/
  7
  8/*
  9 * Copyright (C) 2000 - 2005, R. Byron Moore
 10 * All rights reserved.
 11 *
 12 * Redistribution and use in source and binary forms, with or without
 13 * modification, are permitted provided that the following conditions
 14 * are met:
 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.
 26 *
 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.
 30 *
 31 * NO WARRANTY
 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.
 43 */
 44
 45#include <linux/module.h>
 46
 47#include <acpi/acpi.h>
 48#include <acpi/acnamesp.h>
 49
 50
 51#define _COMPONENT          ACPI_NAMESPACE
 52	 ACPI_MODULE_NAME    ("nsxfobj")
 53
 54/*******************************************************************************
 55 *
 56 * FUNCTION:    acpi_get_type
 57 *
 58 * PARAMETERS:  Handle          - Handle of object whose type is desired
 59 *              *ret_type       - Where the type will be placed
 60 *
 61 * RETURN:      Status
 62 *
 63 * DESCRIPTION: This routine returns the type associatd with a particular handle
 64 *
 65 ******************************************************************************/
 66
 67acpi_status
 68acpi_get_type (
 69	acpi_handle                     handle,
 70	acpi_object_type                *ret_type)
 71{
 72	struct acpi_namespace_node      *node;
 73	acpi_status                     status;
 74
 75
 76	/* Parameter Validation */
 77
 78	if (!ret_type) {
 79		return (AE_BAD_PARAMETER);
 80	}
 81
 82	/*
 83	 * Special case for the predefined Root Node
 84	 * (return type ANY)
 85	 */
 86	if (handle == ACPI_ROOT_OBJECT) {
 87		*ret_type = ACPI_TYPE_ANY;
 88		return (AE_OK);
 89	}
 90
 91	status = acpi_ut_acquire_mutex (ACPI_MTX_NAMESPACE);
 92	if (ACPI_FAILURE (status)) {
 93		return (status);
 94	}
 95
 96	/* Convert and validate the handle */
 97
 98	node = acpi_ns_map_handle_to_node (handle);
 99	if (!node) {
100		(void) acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);
101		return (AE_BAD_PARAMETER);
102	}
103
104	*ret_type = node->type;
105
106
107	status = acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);
108	return (status);
109}
110EXPORT_SYMBOL(acpi_get_type);
111
112
113/*******************************************************************************
114 *
115 * FUNCTION:    acpi_get_parent
116 *
117 * PARAMETERS:  Handle          - Handle of object whose parent is desired
118 *              ret_handle      - Where the parent handle will be placed
119 *
120 * RETURN:      Status
121 *
122 * DESCRIPTION: Returns a handle to the parent of the object represented by
123 *              Handle.
124 *
125 ******************************************************************************/
126
127acpi_status
128acpi_get_parent (
129	acpi_handle                     handle,
130	acpi_handle                     *ret_handle)
131{
132	struct acpi_namespace_node      *node;
133	acpi_status                     status;
134
135
136	if (!ret_handle) {
137		return (AE_BAD_PARAMETER);
138	}
139
140	/* Special case for the predefined Root Node (no parent) */
141
142	if (handle == ACPI_ROOT_OBJECT) {
143		return (AE_NULL_ENTRY);
144	}
145
146	status = acpi_ut_acquire_mutex (ACPI_MTX_NAMESPACE);
147	if (ACPI_FAILURE (status)) {
148		return (status);
149	}
150
151	/* Convert and validate the handle */
152
153	node = acpi_ns_map_handle_to_node (handle);
154	if (!node) {
155		status = AE_BAD_PARAMETER;
156		goto unlock_and_exit;
157	}
158
159	/* Get the parent entry */
160
161	*ret_handle =
162		acpi_ns_convert_entry_to_handle (acpi_ns_get_parent_node (node));
163
164	/* Return exception if parent is null */
165
166	if (!acpi_ns_get_parent_node (node)) {
167		status = AE_NULL_ENTRY;
168	}
169
170
171unlock_and_exit:
172
173	(void) acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);
174	return (status);
175}
176EXPORT_SYMBOL(acpi_get_parent);
177
178
179/*******************************************************************************
180 *
181 * FUNCTION:    acpi_get_next_object
182 *
183 * PARAMETERS:  Type            - Type of object to be searched for
184 *              Parent          - Parent object whose children we are getting
185 *              last_child      - Previous child that was found.
186 *                                The NEXT child will be returned
187 *              ret_handle      - Where handle to the next object is placed
188 *
189 * RETURN:      Status
190 *
191 * DESCRIPTION: Return the next peer object within the namespace.  If Handle is
192 *              valid, Scope is ignored.  Otherwise, the first object within
193 *              Scope is returned.
194 *
195 ******************************************************************************/
196
197acpi_status
198acpi_get_next_object (
199	acpi_object_type                type,
200	acpi_handle                     parent,
201	acpi_handle                     child,
202	acpi_handle                     *ret_handle)
203{
204	acpi_status                     status;
205	struct acpi_namespace_node      *node;
206	struct acpi_namespace_node      *parent_node = NULL;
207	struct acpi_namespace_node      *child_node = NULL;
208
209
210	/* Parameter validation */
211
212	if (type > ACPI_TYPE_EXTERNAL_MAX) {
213		return (AE_BAD_PARAMETER);
214	}
215
216	status = acpi_ut_acquire_mutex (ACPI_MTX_NAMESPACE);
217	if (ACPI_FAILURE (status)) {
218		return (status);
219	}
220
221	/* If null handle, use the parent */
222
223	if (!child) {
224		/* Start search at the beginning of the specified scope */
225
226		parent_node = acpi_ns_map_handle_to_node (parent);
227		if (!parent_node) {
228			status = AE_BAD_PARAMETER;
229			goto unlock_and_exit;
230		}
231	}
232	else {
233		/* Non-null handle, ignore the parent */
234		/* Convert and validate the handle */
235
236		child_node = acpi_ns_map_handle_to_node (child);
237		if (!child_node) {
238			status = AE_BAD_PARAMETER;
239			goto unlock_and_exit;
240		}
241	}
242
243	/* Internal function does the real work */
244
245	node = acpi_ns_get_next_node (type, parent_node, child_node);
246	if (!node) {
247		status = AE_NOT_FOUND;
248		goto unlock_and_exit;
249	}
250
251	if (ret_handle) {
252		*ret_handle = acpi_ns_convert_entry_to_handle (node);
253	}
254
255
256unlock_and_exit:
257
258	(void) acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);
259	return (status);
260}
261EXPORT_SYMBOL(acpi_get_next_object);
262