aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/acpi/acpica/utids.c
blob: d2906328535df5903b887ae3c744473e27061e64 (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
/******************************************************************************
 *
 * Module Name: utids - support for device IDs - HID, UID, CID
 *
 *****************************************************************************/

/*
 * Copyright (C) 2000 - 2010, Intel Corp.
 * 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 "accommon.h"
#include "acinterp.h"

#define _COMPONENT          ACPI_UTILITIES
ACPI_MODULE_NAME("utids")

/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_execute_HID
 *
 * PARAMETERS:  device_node         - Node for the device
 *              return_id           - Where the string HID is returned
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Executes the _HID control method that returns the hardware
 *              ID of the device. The HID is either an 32-bit encoded EISAID
 *              Integer or a String. A string is always returned. An EISAID
 *              is converted to a string.
 *
 *              NOTE: Internal function, no parameter validation
 *
 ******************************************************************************/
acpi_status
acpi_ut_execute_HID(struct acpi_namespace_node *device_node,
		    struct acpica_device_id **return_id)
{
	union acpi_operand_object *obj_desc;
	struct acpica_device_id *hid;
	u32 length;
	acpi_status status;

	ACPI_FUNCTION_TRACE(ut_execute_HID);

	status = acpi_ut_evaluate_object(device_node, METHOD_NAME__HID,
					 ACPI_BTYPE_INTEGER | ACPI_BTYPE_STRING,
					 &obj_desc);
	if (ACPI_FAILURE(status)) {
		return_ACPI_STATUS(status);
	}

	/* Get the size of the String to be returned, includes null terminator */

	if (obj_desc->common.type == ACPI_TYPE_INTEGER) {
		length = ACPI_EISAID_STRING_SIZE;
	} else {
		length = obj_desc->string.length + 1;
	}

	/* Allocate a buffer for the HID */

	hid =
	    ACPI_ALLOCATE_ZEROED(sizeof(struct acpica_device_id) +
				 (acpi_size) length);
	if (!hid) {
		status = AE_NO_MEMORY;
		goto cleanup;
	}

	/* Area for the string starts after DEVICE_ID struct */

	hid->string = ACPI_ADD_PTR(char, hid, sizeof(struct acpica_device_id));

	/* Convert EISAID to a string or simply copy existing string */

	if (obj_desc->common.type == ACPI_TYPE_INTEGER) {
		acpi_ex_eisa_id_to_string(hid->string, obj_desc->integer.value);
	} else {
		ACPI_STRCPY(hid->string, obj_desc->string.pointer);
	}

	hid->length = length;
	*return_id = hid;

cleanup:

	/* On exit, we must delete the return object */

	acpi_ut_remove_reference(obj_desc);
	return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_execute_UID
 *
 * PARAMETERS:  device_node         - Node for the device
 *              return_id           - Where the string UID is returned
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Executes the _UID control method that returns the unique
 *              ID of the device. The UID is either a 64-bit Integer (NOT an
 *              EISAID) or a string. Always returns a string. A 64-bit integer
 *              is converted to a decimal string.
 *
 *              NOTE: Internal function, no parameter validation
 *
 ******************************************************************************/

acpi_status
acpi_ut_execute_UID(struct acpi_namespace_node *device_node,
		    struct acpica_device_id **return_id)
{
	union acpi_operand_object *obj_desc;
	struct acpica_device_id *uid;
	u32 length;
	acpi_status status;

	ACPI_FUNCTION_TRACE(ut_execute_UID);

	status = acpi_ut_evaluate_object(device_node, METHOD_NAME__UID,
					 ACPI_BTYPE_INTEGER | ACPI_BTYPE_STRING,
					 &obj_desc);
	if (ACPI_FAILURE(status)) {
		return_ACPI_STATUS(status);
	}

	/* Get the size of the String to be returned, includes null terminator */

	if (obj_desc->common.type == ACPI_TYPE_INTEGER) {
		length = ACPI_MAX64_DECIMAL_DIGITS + 1;
	} else {
		length = obj_desc->string.length + 1;
	}

	/* Allocate a buffer for the UID */

	uid =
	    ACPI_ALLOCATE_ZEROED(sizeof(struct acpica_device_id) +
				 (acpi_size) length);
	if (!uid) {
		status = AE_NO_MEMORY;
		goto cleanup;
	}

	/* Area for the string starts after DEVICE_ID struct */

	uid->string = ACPI_ADD_PTR(char, uid, sizeof(struct acpica_device_id));

	/* Convert an Integer to string, or just copy an existing string */

	if (obj_desc->common.type == ACPI_TYPE_INTEGER) {
		acpi_ex_integer_to_string(uid->string, obj_desc->integer.value);
	} else {
		ACPI_STRCPY(uid->string, obj_desc->string.pointer);
	}

	uid->length = length;
	*return_id = uid;

cleanup:

	/* On exit, we must delete the return object */

	acpi_ut_remove_reference(obj_desc);
	return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_execute_CID
 *
 * PARAMETERS:  device_node         - Node for the device
 *              return_cid_list     - Where the CID list is returned
 *
 * RETURN:      Status, list of CID strings
 *
 * DESCRIPTION: Executes the _CID control method that returns one or more
 *              compatible hardware IDs for the device.
 *
 *              NOTE: Internal function, no parameter validation
 *
 * A _CID method can return either a single compatible ID or a package of
 * compatible IDs. Each compatible ID can be one of the following:
 * 1) Integer (32 bit compressed EISA ID) or
 * 2) String (PCI ID format, e.g. "PCI\VEN_vvvv&DEV_dddd&SUBSYS_ssssssss")
 *
 * The Integer CIDs are converted to string format by this function.
 *
 ******************************************************************************/

acpi_status
acpi_ut_execute_CID(struct acpi_namespace_node *device_node,
		    struct acpica_device_id_list **return_cid_list)
{
	union acpi_operand_object **cid_objects;
	union acpi_operand_object *obj_desc;
	struct acpica_device_id_list *cid_list;
	char *next_id_string;
	u32 string_area_size;
	u32 length;
	u32 cid_list_size;
	acpi_status status;
	u32 count;
	u32 i;

	ACPI_FUNCTION_TRACE(ut_execute_CID);

	/* Evaluate the _CID method for this device */

	status = acpi_ut_evaluate_object(device_node, METHOD_NAME__CID,
					 ACPI_BTYPE_INTEGER | ACPI_BTYPE_STRING
					 | ACPI_BTYPE_PACKAGE, &obj_desc);
	if (ACPI_FAILURE(status)) {
		return_ACPI_STATUS(status);
	}

	/*
	 * Get the count and size of the returned _CIDs. _CID can return either
	 * a Package of Integers/Strings or a single Integer or String.
	 * Note: This section also validates that all CID elements are of the
	 * correct type (Integer or String).
	 */
	if (obj_desc->common.type == ACPI_TYPE_PACKAGE) {
		count = obj_desc->package.count;
		cid_objects = obj_desc->package.elements;
	} else {		/* Single Integer or String CID */

		count = 1;
		cid_objects = &obj_desc;
	}

	string_area_size = 0;
	for (i = 0; i < count; i++) {

		/* String lengths include null terminator */

		switch (cid_objects[i]->common.type) {
		case ACPI_TYPE_INTEGER:
			string_area_size += ACPI_EISAID_STRING_SIZE;
			break;

		case ACPI_TYPE_STRING:
			string_area_size += cid_objects[i]->string.length + 1;
			break;

		default:
			status = AE_TYPE;
			goto cleanup;
		}
	}

	/*
	 * Now that we know the length of the CIDs, allocate return buffer:
	 * 1) Size of the base structure +
	 * 2) Size of the CID DEVICE_ID array +
	 * 3) Size of the actual CID strings
	 */
	cid_list_size = sizeof(struct acpica_device_id_list) +
	    ((count - 1) * sizeof(struct acpica_device_id)) + string_area_size;

	cid_list = ACPI_ALLOCATE_ZEROED(cid_list_size);
	if (!cid_list) {
		status = AE_NO_MEMORY;
		goto cleanup;
	}

	/* Area for CID strings starts after the CID DEVICE_ID array */

	next_id_string = ACPI_CAST_PTR(char, cid_list->ids) +
	    ((acpi_size) count * sizeof(struct acpica_device_id));

	/* Copy/convert the CIDs to the return buffer */

	for (i = 0; i < count; i++) {
		if (cid_objects[i]->common.type == ACPI_TYPE_INTEGER) {

			/* Convert the Integer (EISAID) CID to a string */

			acpi_ex_eisa_id_to_string(next_id_string,
						  cid_objects[i]->integer.
						  value);
			length = ACPI_EISAID_STRING_SIZE;
		} else {	/* ACPI_TYPE_STRING */

			/* Copy the String CID from the returned object */

			ACPI_STRCPY(next_id_string,
				    cid_objects[i]->string.pointer);
			length = cid_objects[i]->string.length + 1;
		}

		cid_list->ids[i].string = next_id_string;
		cid_list->ids[i].length = length;
		next_id_string += length;
	}

	/* Finish the CID list */

	cid_list->count = count;
	cid_list->list_size = cid_list_size;
	*return_cid_list = cid_list;

cleanup:

	/* On exit, we must delete the _CID return object */

	acpi_ut_remove_reference(obj_desc);
	return_ACPI_STATUS(status);
}