aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/acpi/namespace/nsobject.c
blob: aabe8794b908bd5ff91b55043cb4ee3c97be9689 (plain) (blame)
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
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
/*******************************************************************************
 *
 * Module Name: nsobject - Utilities for objects attached to namespace
 *                         table entries
 *
 ******************************************************************************/

/*
 * Copyright (C) 2000 - 2006, R. Byron Moore
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions, and the following disclaimer,
 *    without modification.
 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
 *    substantially similar to the "NO WARRANTY" disclaimer below
 *    ("Disclaimer") and any redistribution must be conditioned upon
 *    including a substantially similar Disclaimer requirement for further
 *    binary redistribution.
 * 3. Neither the names of the above-listed copyright holders nor the names
 *    of any contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * Alternatively, this software may be distributed under the terms of the
 * GNU General Public License ("GPL") version 2 as published by the Free
 * Software Foundation.
 *
 * NO WARRANTY
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGES.
 */

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

#define _COMPONENT          ACPI_NAMESPACE
ACPI_MODULE_NAME("nsobject")

/*******************************************************************************
 *
 * FUNCTION:    acpi_ns_attach_object
 *
 * PARAMETERS:  Node                - Parent Node
 *              Object              - Object to be attached
 *              Type                - Type of object, or ACPI_TYPE_ANY if not
 *                                    known
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Record the given object as the value associated with the
 *              name whose acpi_handle is passed.  If Object is NULL
 *              and Type is ACPI_TYPE_ANY, set the name as having no value.
 *              Note: Future may require that the Node->Flags field be passed
 *              as a parameter.
 *
 * MUTEX:       Assumes namespace is locked
 *
 ******************************************************************************/
acpi_status
acpi_ns_attach_object(struct acpi_namespace_node *node,
		      union acpi_operand_object *object, acpi_object_type type)
{
	union acpi_operand_object *obj_desc;
	union acpi_operand_object *last_obj_desc;
	acpi_object_type object_type = ACPI_TYPE_ANY;

	ACPI_FUNCTION_TRACE(ns_attach_object);

	/*
	 * Parameter validation
	 */
	if (!node) {

		/* Invalid handle */

		ACPI_ERROR((AE_INFO, "Null NamedObj handle"));
		return_ACPI_STATUS(AE_BAD_PARAMETER);
	}

	if (!object && (ACPI_TYPE_ANY != type)) {

		/* Null object */

		ACPI_ERROR((AE_INFO,
			    "Null object, but type not ACPI_TYPE_ANY"));
		return_ACPI_STATUS(AE_BAD_PARAMETER);
	}

	if (ACPI_GET_DESCRIPTOR_TYPE(node) != ACPI_DESC_TYPE_NAMED) {

		/* Not a name handle */

		ACPI_ERROR((AE_INFO, "Invalid handle %p [%s]",
			    node, acpi_ut_get_descriptor_name(node)));
		return_ACPI_STATUS(AE_BAD_PARAMETER);
	}

	/* Check if this object is already attached */

	if (node->object == object) {
		ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
				  "Obj %p already installed in NameObj %p\n",
				  object, node));

		return_ACPI_STATUS(AE_OK);
	}

	/* If null object, we will just install it */

	if (!object) {
		obj_desc = NULL;
		object_type = ACPI_TYPE_ANY;
	}

	/*
	 * If the source object is a namespace Node with an attached object,
	 * we will use that (attached) object
	 */
	else if ((ACPI_GET_DESCRIPTOR_TYPE(object) == ACPI_DESC_TYPE_NAMED) &&
		 ((struct acpi_namespace_node *)object)->object) {
		/*
		 * Value passed is a name handle and that name has a
		 * non-null value.  Use that name's value and type.
		 */
		obj_desc = ((struct acpi_namespace_node *)object)->object;
		object_type = ((struct acpi_namespace_node *)object)->type;
	}

	/*
	 * Otherwise, we will use the parameter object, but we must type
	 * it first
	 */
	else {
		obj_desc = (union acpi_operand_object *)object;

		/* Use the given type */

		object_type = type;
	}

	ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Installing %p into Node %p [%4.4s]\n",
			  obj_desc, node, acpi_ut_get_node_name(node)));

	/* Detach an existing attached object if present */

	if (node->object) {
		acpi_ns_detach_object(node);
	}

	if (obj_desc) {
		/*
		 * Must increment the new value's reference count
		 * (if it is an internal object)
		 */
		acpi_ut_add_reference(obj_desc);

		/*
		 * Handle objects with multiple descriptors - walk
		 * to the end of the descriptor list
		 */
		last_obj_desc = obj_desc;
		while (last_obj_desc->common.next_object) {
			last_obj_desc = last_obj_desc->common.next_object;
		}

		/* Install the object at the front of the object list */

		last_obj_desc->common.next_object = node->object;
	}

	node->type = (u8) object_type;
	node->object = obj_desc;

	return_ACPI_STATUS(AE_OK);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ns_detach_object
 *
 * PARAMETERS:  Node           - A Namespace node whose object will be detached
 *
 * RETURN:      None.
 *
 * DESCRIPTION: Detach/delete an object associated with a namespace node.
 *              if the object is an allocated object, it is freed.
 *              Otherwise, the field is simply cleared.
 *
 ******************************************************************************/

void acpi_ns_detach_object(struct acpi_namespace_node *node)
{
	union acpi_operand_object *obj_desc;

	ACPI_FUNCTION_TRACE(ns_detach_object);

	obj_desc = node->object;

	if (!obj_desc ||
	    (ACPI_GET_OBJECT_TYPE(obj_desc) == ACPI_TYPE_LOCAL_DATA)) {
		return_VOID;
	}

	/* Clear the entry in all cases */

	node->object = NULL;
	if (ACPI_GET_DESCRIPTOR_TYPE(obj_desc) == ACPI_DESC_TYPE_OPERAND) {
		node->object = obj_desc->common.next_object;
		if (node->object &&
		    (ACPI_GET_OBJECT_TYPE(node->object) !=
		     ACPI_TYPE_LOCAL_DATA)) {
			node->object = node->object->common.next_object;
		}
	}

	/* Reset the node type to untyped */

	node->type = ACPI_TYPE_ANY;

	ACPI_DEBUG_PRINT((ACPI_DB_NAMES, "Node %p [%4.4s] Object %p\n",
			  node, acpi_ut_get_node_name(node), obj_desc));

	/* Remove one reference on the object (and all subobjects) */

	acpi_ut_remove_reference(obj_desc);
	return_VOID;
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ns_get_attached_object
 *
 * PARAMETERS:  Node             - Namespace node
 *
 * RETURN:      Current value of the object field from the Node whose
 *              handle is passed
 *
 * DESCRIPTION: Obtain the object attached to a namespace node.
 *
 ******************************************************************************/

union acpi_operand_object *acpi_ns_get_attached_object(struct
						       acpi_namespace_node
						       *node)
{
	ACPI_FUNCTION_TRACE_PTR(ns_get_attached_object, node);

	if (!node) {
		ACPI_WARNING((AE_INFO, "Null Node ptr"));
		return_PTR(NULL);
	}

	if (!node->object ||
	    ((ACPI_GET_DESCRIPTOR_TYPE(node->object) != ACPI_DESC_TYPE_OPERAND)
	     && (ACPI_GET_DESCRIPTOR_TYPE(node->object) !=
		 ACPI_DESC_TYPE_NAMED))
	    || (ACPI_GET_OBJECT_TYPE(node->object) == ACPI_TYPE_LOCAL_DATA)) {
		return_PTR(NULL);
	}

	return_PTR(node->object);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ns_get_secondary_object
 *
 * PARAMETERS:  Node             - Namespace node
 *
 * RETURN:      Current value of the object field from the Node whose
 *              handle is passed.
 *
 * DESCRIPTION: Obtain a secondary object associated with a namespace node.
 *
 ******************************************************************************/

union acpi_operand_object *acpi_ns_get_secondary_object(union
							acpi_operand_object
							*obj_desc)
{
	ACPI_FUNCTION_TRACE_PTR(ns_get_secondary_object, obj_desc);

	if ((!obj_desc) ||
	    (ACPI_GET_OBJECT_TYPE(obj_desc) == ACPI_TYPE_LOCAL_DATA) ||
	    (!obj_desc->common.next_object) ||
	    (ACPI_GET_OBJECT_TYPE(obj_desc->common.next_object) ==
	     ACPI_TYPE_LOCAL_DATA)) {
		return_PTR(NULL);
	}

	return_PTR(obj_desc->common.next_object);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ns_attach_data
 *
 * PARAMETERS:  Node            - Namespace node
 *              Handler         - Handler to be associated with the data
 *              Data            - Data to be attached
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Low-level attach data.  Create and attach a Data object.
 *
 ******************************************************************************/

acpi_status
acpi_ns_attach_data(struct acpi_namespace_node *node,
		    acpi_object_handler handler, void *data)
{
	union acpi_operand_object *prev_obj_desc;
	union acpi_operand_object *obj_desc;
	union acpi_operand_object *data_desc;

	/* We only allow one attachment per handler */

	prev_obj_desc = NULL;
	obj_desc = node->object;
	while (obj_desc) {
		if ((ACPI_GET_OBJECT_TYPE(obj_desc) == ACPI_TYPE_LOCAL_DATA) &&
		    (obj_desc->data.handler == handler)) {
			return (AE_ALREADY_EXISTS);
		}

		prev_obj_desc = obj_desc;
		obj_desc = obj_desc->common.next_object;
	}

	/* Create an internal object for the data */

	data_desc = acpi_ut_create_internal_object(ACPI_TYPE_LOCAL_DATA);
	if (!data_desc) {
		return (AE_NO_MEMORY);
	}

	data_desc->data.handler = handler;
	data_desc->data.pointer = data;

	/* Install the data object */

	if (prev_obj_desc) {
		prev_obj_desc->common.next_object = data_desc;
	} else {
		node->object = data_desc;
	}

	return (AE_OK);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ns_detach_data
 *
 * PARAMETERS:  Node            - Namespace node
 *              Handler         - Handler associated with the data
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Low-level detach data.  Delete the data node, but the caller
 *              is responsible for the actual data.
 *
 ******************************************************************************/

acpi_status
acpi_ns_detach_data(struct acpi_namespace_node * node,
		    acpi_object_handler handler)
{
	union acpi_operand_object *obj_desc;
	union acpi_operand_object *prev_obj_desc;

	prev_obj_desc = NULL;
	obj_desc = node->object;
	while (obj_desc) {
		if ((ACPI_GET_OBJECT_TYPE(obj_desc) == ACPI_TYPE_LOCAL_DATA) &&
		    (obj_desc->data.handler == handler)) {
			if (prev_obj_desc) {
				prev_obj_desc->common.next_object =
				    obj_desc->common.next_object;
			} else {
				node->object = obj_desc->common.next_object;
			}

			acpi_ut_remove_reference(obj_desc);
			return (AE_OK);
		}

		prev_obj_desc = obj_desc;
		obj_desc = obj_desc->common.next_object;
	}

	return (AE_NOT_FOUND);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ns_get_attached_data
 *
 * PARAMETERS:  Node            - Namespace node
 *              Handler         - Handler associated with the data
 *              Data            - Where the data is returned
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Low level interface to obtain data previously associated with
 *              a namespace node.
 *
 ******************************************************************************/

acpi_status
acpi_ns_get_attached_data(struct acpi_namespace_node * node,
			  acpi_object_handler handler, void **data)
{
	union acpi_operand_object *obj_desc;

	obj_desc = node->object;
	while (obj_desc) {
		if ((ACPI_GET_OBJECT_TYPE(obj_desc) == ACPI_TYPE_LOCAL_DATA) &&
		    (obj_desc->data.handler == handler)) {
			*data = obj_desc->data.pointer;
			return (AE_OK);
		}

		obj_desc = obj_desc->common.next_object;
	}

	return (AE_NOT_FOUND);
}