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1 | /****************************************************************************** |
2 | * | |
3 | * Module Name: utids - support for device IDs - HID, UID, CID | |
4 | * | |
5 | *****************************************************************************/ | |
6 | ||
7 | /* | |
8 | * Copyright (C) 2000 - 2009, Intel Corp. | |
9 | * All rights reserved. | |
10 | * | |
11 | * Redistribution and use in source and binary forms, with or without | |
12 | * modification, are permitted provided that the following conditions | |
13 | * are met: | |
14 | * 1. Redistributions of source code must retain the above copyright | |
15 | * notice, this list of conditions, and the following disclaimer, | |
16 | * without modification. | |
17 | * 2. Redistributions in binary form must reproduce at minimum a disclaimer | |
18 | * substantially similar to the "NO WARRANTY" disclaimer below | |
19 | * ("Disclaimer") and any redistribution must be conditioned upon | |
20 | * including a substantially similar Disclaimer requirement for further | |
21 | * binary redistribution. | |
22 | * 3. Neither the names of the above-listed copyright holders nor the names | |
23 | * of any contributors may be used to endorse or promote products derived | |
24 | * from this software without specific prior written permission. | |
25 | * | |
26 | * Alternatively, this software may be distributed under the terms of the | |
27 | * GNU General Public License ("GPL") version 2 as published by the Free | |
28 | * Software Foundation. | |
29 | * | |
30 | * NO WARRANTY | |
31 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
32 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
33 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR | |
34 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |
35 | * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
36 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
37 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
38 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, | |
39 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING | |
40 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | |
41 | * POSSIBILITY OF SUCH DAMAGES. | |
42 | */ | |
43 | ||
44 | #include <acpi/acpi.h> | |
45 | #include "accommon.h" | |
46 | #include "acinterp.h" | |
47 | ||
48 | #define _COMPONENT ACPI_UTILITIES | |
49 | ACPI_MODULE_NAME("utids") | |
50 | ||
51 | /* Local prototypes */ | |
52 | static void acpi_ut_copy_id_string(char *destination, char *source); | |
53 | ||
54 | /******************************************************************************* | |
55 | * | |
56 | * FUNCTION: acpi_ut_copy_id_string | |
57 | * | |
58 | * PARAMETERS: Destination - Where to copy the string | |
59 | * Source - Source string | |
60 | * | |
61 | * RETURN: None | |
62 | * | |
63 | * DESCRIPTION: Copies an ID string for the _HID, _CID, and _UID methods. | |
64 | * Performs removal of a leading asterisk if present -- workaround | |
65 | * for a known issue on a bunch of machines. | |
66 | * | |
67 | ******************************************************************************/ | |
68 | ||
69 | static void acpi_ut_copy_id_string(char *destination, char *source) | |
70 | { | |
71 | ||
72 | /* | |
73 | * Workaround for ID strings that have a leading asterisk. This construct | |
74 | * is not allowed by the ACPI specification (ID strings must be | |
75 | * alphanumeric), but enough existing machines have this embedded in their | |
76 | * ID strings that the following code is useful. | |
77 | */ | |
78 | if (*source == '*') { | |
79 | source++; | |
80 | } | |
81 | ||
82 | /* Do the actual copy */ | |
83 | ||
84 | ACPI_STRCPY(destination, source); | |
85 | } | |
86 | ||
87 | /******************************************************************************* | |
88 | * | |
89 | * FUNCTION: acpi_ut_execute_HID | |
90 | * | |
91 | * PARAMETERS: device_node - Node for the device | |
92 | * return_id - Where the string HID is returned | |
93 | * | |
94 | * RETURN: Status | |
95 | * | |
96 | * DESCRIPTION: Executes the _HID control method that returns the hardware | |
97 | * ID of the device. The HID is either an 32-bit encoded EISAID | |
98 | * Integer or a String. A string is always returned. An EISAID | |
99 | * is converted to a string. | |
100 | * | |
101 | * NOTE: Internal function, no parameter validation | |
102 | * | |
103 | ******************************************************************************/ | |
104 | ||
105 | acpi_status | |
106 | acpi_ut_execute_HID(struct acpi_namespace_node *device_node, | |
107 | struct acpica_device_id **return_id) | |
108 | { | |
109 | union acpi_operand_object *obj_desc; | |
110 | struct acpica_device_id *hid; | |
111 | u32 length; | |
112 | acpi_status status; | |
113 | ||
114 | ACPI_FUNCTION_TRACE(ut_execute_HID); | |
115 | ||
116 | status = acpi_ut_evaluate_object(device_node, METHOD_NAME__HID, | |
117 | ACPI_BTYPE_INTEGER | ACPI_BTYPE_STRING, | |
118 | &obj_desc); | |
119 | if (ACPI_FAILURE(status)) { | |
120 | return_ACPI_STATUS(status); | |
121 | } | |
122 | ||
123 | /* Get the size of the String to be returned, includes null terminator */ | |
124 | ||
125 | if (obj_desc->common.type == ACPI_TYPE_INTEGER) { | |
126 | length = ACPI_EISAID_STRING_SIZE; | |
127 | } else { | |
128 | length = obj_desc->string.length + 1; | |
129 | } | |
130 | ||
131 | /* Allocate a buffer for the HID */ | |
132 | ||
133 | hid = | |
134 | ACPI_ALLOCATE_ZEROED(sizeof(struct acpica_device_id) + | |
135 | (acpi_size) length); | |
136 | if (!hid) { | |
137 | status = AE_NO_MEMORY; | |
138 | goto cleanup; | |
139 | } | |
140 | ||
141 | /* Area for the string starts after DEVICE_ID struct */ | |
142 | ||
143 | hid->string = ACPI_ADD_PTR(char, hid, sizeof(struct acpica_device_id)); | |
144 | ||
145 | /* Convert EISAID to a string or simply copy existing string */ | |
146 | ||
147 | if (obj_desc->common.type == ACPI_TYPE_INTEGER) { | |
148 | acpi_ex_eisa_id_to_string(hid->string, obj_desc->integer.value); | |
149 | } else { | |
150 | acpi_ut_copy_id_string(hid->string, obj_desc->string.pointer); | |
151 | } | |
152 | ||
153 | hid->length = length; | |
154 | *return_id = hid; | |
155 | ||
156 | cleanup: | |
157 | ||
158 | /* On exit, we must delete the return object */ | |
159 | ||
160 | acpi_ut_remove_reference(obj_desc); | |
161 | return_ACPI_STATUS(status); | |
162 | } | |
163 | ||
164 | /******************************************************************************* | |
165 | * | |
166 | * FUNCTION: acpi_ut_execute_UID | |
167 | * | |
168 | * PARAMETERS: device_node - Node for the device | |
169 | * return_id - Where the string UID is returned | |
170 | * | |
171 | * RETURN: Status | |
172 | * | |
173 | * DESCRIPTION: Executes the _UID control method that returns the unique | |
174 | * ID of the device. The UID is either a 64-bit Integer (NOT an | |
175 | * EISAID) or a string. Always returns a string. A 64-bit integer | |
176 | * is converted to a decimal string. | |
177 | * | |
178 | * NOTE: Internal function, no parameter validation | |
179 | * | |
180 | ******************************************************************************/ | |
181 | ||
182 | acpi_status | |
183 | acpi_ut_execute_UID(struct acpi_namespace_node *device_node, | |
184 | struct acpica_device_id **return_id) | |
185 | { | |
186 | union acpi_operand_object *obj_desc; | |
187 | struct acpica_device_id *uid; | |
188 | u32 length; | |
189 | acpi_status status; | |
190 | ||
191 | ACPI_FUNCTION_TRACE(ut_execute_UID); | |
192 | ||
193 | status = acpi_ut_evaluate_object(device_node, METHOD_NAME__UID, | |
194 | ACPI_BTYPE_INTEGER | ACPI_BTYPE_STRING, | |
195 | &obj_desc); | |
196 | if (ACPI_FAILURE(status)) { | |
197 | return_ACPI_STATUS(status); | |
198 | } | |
199 | ||
200 | /* Get the size of the String to be returned, includes null terminator */ | |
201 | ||
202 | if (obj_desc->common.type == ACPI_TYPE_INTEGER) { | |
203 | length = ACPI_MAX64_DECIMAL_DIGITS + 1; | |
204 | } else { | |
205 | length = obj_desc->string.length + 1; | |
206 | } | |
207 | ||
208 | /* Allocate a buffer for the UID */ | |
209 | ||
210 | uid = | |
211 | ACPI_ALLOCATE_ZEROED(sizeof(struct acpica_device_id) + | |
212 | (acpi_size) length); | |
213 | if (!uid) { | |
214 | status = AE_NO_MEMORY; | |
215 | goto cleanup; | |
216 | } | |
217 | ||
218 | /* Area for the string starts after DEVICE_ID struct */ | |
219 | ||
220 | uid->string = ACPI_ADD_PTR(char, uid, sizeof(struct acpica_device_id)); | |
221 | ||
222 | /* Convert an Integer to string, or just copy an existing string */ | |
223 | ||
224 | if (obj_desc->common.type == ACPI_TYPE_INTEGER) { | |
225 | acpi_ex_integer_to_string(uid->string, obj_desc->integer.value); | |
226 | } else { | |
227 | acpi_ut_copy_id_string(uid->string, obj_desc->string.pointer); | |
228 | } | |
229 | ||
230 | uid->length = length; | |
231 | *return_id = uid; | |
232 | ||
233 | cleanup: | |
234 | ||
235 | /* On exit, we must delete the return object */ | |
236 | ||
237 | acpi_ut_remove_reference(obj_desc); | |
238 | return_ACPI_STATUS(status); | |
239 | } | |
240 | ||
241 | /******************************************************************************* | |
242 | * | |
243 | * FUNCTION: acpi_ut_execute_CID | |
244 | * | |
245 | * PARAMETERS: device_node - Node for the device | |
246 | * return_cid_list - Where the CID list is returned | |
247 | * | |
248 | * RETURN: Status, list of CID strings | |
249 | * | |
250 | * DESCRIPTION: Executes the _CID control method that returns one or more | |
251 | * compatible hardware IDs for the device. | |
252 | * | |
253 | * NOTE: Internal function, no parameter validation | |
254 | * | |
255 | * A _CID method can return either a single compatible ID or a package of | |
256 | * compatible IDs. Each compatible ID can be one of the following: | |
257 | * 1) Integer (32 bit compressed EISA ID) or | |
258 | * 2) String (PCI ID format, e.g. "PCI\VEN_vvvv&DEV_dddd&SUBSYS_ssssssss") | |
259 | * | |
260 | * The Integer CIDs are converted to string format by this function. | |
261 | * | |
262 | ******************************************************************************/ | |
263 | ||
264 | acpi_status | |
265 | acpi_ut_execute_CID(struct acpi_namespace_node *device_node, | |
266 | struct acpica_device_id_list **return_cid_list) | |
267 | { | |
268 | union acpi_operand_object **cid_objects; | |
269 | union acpi_operand_object *obj_desc; | |
270 | struct acpica_device_id_list *cid_list; | |
271 | char *next_id_string; | |
272 | u32 string_area_size; | |
273 | u32 length; | |
274 | u32 cid_list_size; | |
275 | acpi_status status; | |
276 | u32 count; | |
277 | u32 i; | |
278 | ||
279 | ACPI_FUNCTION_TRACE(ut_execute_CID); | |
280 | ||
281 | /* Evaluate the _CID method for this device */ | |
282 | ||
283 | status = acpi_ut_evaluate_object(device_node, METHOD_NAME__CID, | |
284 | ACPI_BTYPE_INTEGER | ACPI_BTYPE_STRING | |
285 | | ACPI_BTYPE_PACKAGE, &obj_desc); | |
286 | if (ACPI_FAILURE(status)) { | |
287 | return_ACPI_STATUS(status); | |
288 | } | |
289 | ||
290 | /* | |
291 | * Get the count and size of the returned _CIDs. _CID can return either | |
292 | * a Package of Integers/Strings or a single Integer or String. | |
293 | * Note: This section also validates that all CID elements are of the | |
294 | * correct type (Integer or String). | |
295 | */ | |
296 | if (obj_desc->common.type == ACPI_TYPE_PACKAGE) { | |
297 | count = obj_desc->package.count; | |
298 | cid_objects = obj_desc->package.elements; | |
299 | } else { /* Single Integer or String CID */ | |
300 | ||
301 | count = 1; | |
302 | cid_objects = &obj_desc; | |
303 | } | |
304 | ||
305 | string_area_size = 0; | |
306 | for (i = 0; i < count; i++) { | |
307 | ||
308 | /* String lengths include null terminator */ | |
309 | ||
310 | switch (cid_objects[i]->common.type) { | |
311 | case ACPI_TYPE_INTEGER: | |
312 | string_area_size += ACPI_EISAID_STRING_SIZE; | |
313 | break; | |
314 | ||
315 | case ACPI_TYPE_STRING: | |
316 | string_area_size += cid_objects[i]->string.length + 1; | |
317 | break; | |
318 | ||
319 | default: | |
320 | status = AE_TYPE; | |
321 | goto cleanup; | |
322 | } | |
323 | } | |
324 | ||
325 | /* | |
326 | * Now that we know the length of the CIDs, allocate return buffer: | |
327 | * 1) Size of the base structure + | |
328 | * 2) Size of the CID DEVICE_ID array + | |
329 | * 3) Size of the actual CID strings | |
330 | */ | |
331 | cid_list_size = sizeof(struct acpica_device_id_list) + | |
332 | ((count - 1) * sizeof(struct acpica_device_id)) + string_area_size; | |
333 | ||
334 | cid_list = ACPI_ALLOCATE_ZEROED(cid_list_size); | |
335 | if (!cid_list) { | |
336 | status = AE_NO_MEMORY; | |
337 | goto cleanup; | |
338 | } | |
339 | ||
340 | /* Area for CID strings starts after the CID DEVICE_ID array */ | |
341 | ||
342 | next_id_string = ACPI_CAST_PTR(char, cid_list->ids) + | |
343 | ((acpi_size) count * sizeof(struct acpica_device_id)); | |
344 | ||
345 | /* Copy/convert the CIDs to the return buffer */ | |
346 | ||
347 | for (i = 0; i < count; i++) { | |
348 | if (cid_objects[i]->common.type == ACPI_TYPE_INTEGER) { | |
349 | ||
350 | /* Convert the Integer (EISAID) CID to a string */ | |
351 | ||
352 | acpi_ex_eisa_id_to_string(next_id_string, | |
353 | cid_objects[i]->integer. | |
354 | value); | |
355 | length = ACPI_EISAID_STRING_SIZE; | |
356 | } else { /* ACPI_TYPE_STRING */ | |
357 | ||
358 | /* Copy the String CID from the returned object */ | |
359 | ||
360 | acpi_ut_copy_id_string(next_id_string, | |
361 | cid_objects[i]->string.pointer); | |
362 | length = cid_objects[i]->string.length + 1; | |
363 | } | |
364 | ||
365 | cid_list->ids[i].string = next_id_string; | |
366 | cid_list->ids[i].length = length; | |
367 | next_id_string += length; | |
368 | } | |
369 | ||
370 | /* Finish the CID list */ | |
371 | ||
372 | cid_list->count = count; | |
373 | cid_list->list_size = cid_list_size; | |
374 | *return_cid_list = cid_list; | |
375 | ||
376 | cleanup: | |
377 | ||
378 | /* On exit, we must delete the _CID return object */ | |
379 | ||
380 | acpi_ut_remove_reference(obj_desc); | |
381 | return_ACPI_STATUS(status); | |
382 | } |