summaryrefslogtreecommitdiffstats
path: root/drivers/acpi/acpica/nsxfobj.c
blob: c022bef263e58693153cd86d65ece317be95189f (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
/*******************************************************************************
 *
 * Module Name: nsxfobj - Public interfaces to the ACPI subsystem
 *                         ACPI Object oriented interfaces
 *
 ******************************************************************************/

#define EXPORT_ACPI_INTERFACES

#include <acpi/acpi.h>
#include "accommon.h"
#include "acnamesp.h"

#define _COMPONENT          ACPI_NAMESPACE
ACPI_MODULE_NAME("nsxfobj")

/*******************************************************************************
 *
 * FUNCTION:    acpi_get_type
 *
 * PARAMETERS:  handle          - Handle of object whose type is desired
 *              ret_type        - Where the type will be placed
 *
 * RETURN:      Status
 *
 * DESCRIPTION: This routine returns the type associatd with a particular handle
 *
 ******************************************************************************/
acpi_status acpi_get_type(acpi_handle handle, acpi_object_type *ret_type)
{
	struct acpi_namespace_node *node;
	acpi_status status;

	/* Parameter Validation */

	if (!ret_type) {
		return (AE_BAD_PARAMETER);
	}

	/* Special case for the predefined Root Node (return type ANY) */

	if (handle == ACPI_ROOT_OBJECT) {
		*ret_type = ACPI_TYPE_ANY;
		return (AE_OK);
	}

	status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
	if (ACPI_FAILURE(status)) {
		return (status);
	}

	/* Convert and validate the handle */

	node = acpi_ns_validate_handle(handle);
	if (!node) {
		(void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
		return (AE_BAD_PARAMETER);
	}

	*ret_type = node->type;

	status = acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
	return (status);
}

ACPI_EXPORT_SYMBOL(acpi_get_type)

/*******************************************************************************
 *
 * FUNCTION:    acpi_get_parent
 *
 * PARAMETERS:  handle          - Handle of object whose parent is desired
 *              ret_handle      - Where the parent handle will be placed
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Returns a handle to the parent of the object represented by
 *              Handle.
 *
 ******************************************************************************/
acpi_status acpi_get_parent(acpi_handle handle, acpi_handle *ret_handle)
{
	struct acpi_namespace_node *node;
	struct acpi_namespace_node *parent_node;
	acpi_status status;

	if (!ret_handle) {
		return (AE_BAD_PARAMETER);
	}

	/* Special case for the predefined Root Node (no parent) */

	if (handle == ACPI_ROOT_OBJECT) {
		return (AE_NULL_ENTRY);
	}

	status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
	if (ACPI_FAILURE(status)) {
		return (status);
	}

	/* Convert and validate the handle */

	node = acpi_ns_validate_handle(handle);
	if (!node) {
		status = AE_BAD_PARAMETER;
		goto unlock_and_exit;
	}

	/* Get the parent entry */

	parent_node = node->parent;
	*ret_handle = ACPI_CAST_PTR(acpi_handle, parent_node);

	/* Return exception if parent is null */

	if (!parent_node) {
		status = AE_NULL_ENTRY;
	}

unlock_and_exit:

	(void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
	return (status);
}

ACPI_EXPORT_SYMBOL(acpi_get_parent)

/*******************************************************************************
 *
 * FUNCTION:    acpi_get_next_object
 *
 * PARAMETERS:  type            - Type of object to be searched for
 *              parent          - Parent object whose children we are getting
 *              last_child      - Previous child that was found.
 *                                The NEXT child will be returned
 *              ret_handle      - Where handle to the next object is placed
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Return the next peer object within the namespace. If Handle is
 *              valid, Scope is ignored. Otherwise, the first object within
 *              Scope is returned.
 *
 ******************************************************************************/
acpi_status
acpi_get_next_object(acpi_object_type type,
		     acpi_handle parent,
		     acpi_handle child, acpi_handle *ret_handle)
{
	acpi_status status;
	struct acpi_namespace_node *node;
	struct acpi_namespace_node *parent_node = NULL;
	struct acpi_namespace_node *child_node = NULL;

	/* Parameter validation */

	if (type > ACPI_TYPE_EXTERNAL_MAX) {
		return (AE_BAD_PARAMETER);
	}

	status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
	if (ACPI_FAILURE(status)) {
		return (status);
	}

	/* If null handle, use the parent */

	if (!child) {

		/* Start search at the beginning of the specified scope */

		parent_node = acpi_ns_validate_handle(parent);
		if (!parent_node) {
			status = AE_BAD_PARAMETER;
			goto unlock_and_exit;
		}
	} else {
		/* Non-null handle, ignore the parent */
		/* Convert and validate the handle */

		child_node = acpi_ns_validate_handle(child);
		if (!child_node) {
			status = AE_BAD_PARAMETER;
			goto unlock_and_exit;
		}
	}

	/* Internal function does the real work */

	node = acpi_ns_get_next_node_typed(type, parent_node, child_node);
	if (!node) {
		status = AE_NOT_FOUND;
		goto unlock_and_exit;
	}

	if (ret_handle) {
		*ret_handle = ACPI_CAST_PTR(acpi_handle, node);
	}

unlock_and_exit:

	(void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
	return (status);
}

ACPI_EXPORT_SYMBOL(acpi_get_next_object)