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ffdcd955 MW |
1 | /* |
2 | * ACPI device specific properties support. | |
3 | * | |
4 | * Copyright (C) 2014, Intel Corporation | |
5 | * All rights reserved. | |
6 | * | |
7 | * Authors: Mika Westerberg <mika.westerberg@linux.intel.com> | |
8 | * Darren Hart <dvhart@linux.intel.com> | |
9 | * Rafael J. Wysocki <rafael.j.wysocki@intel.com> | |
10 | * | |
11 | * This program is free software; you can redistribute it and/or modify | |
12 | * it under the terms of the GNU General Public License version 2 as | |
13 | * published by the Free Software Foundation. | |
14 | */ | |
15 | ||
16 | #include <linux/acpi.h> | |
17 | #include <linux/device.h> | |
18 | #include <linux/export.h> | |
19 | ||
20 | #include "internal.h" | |
21 | ||
3a7a2ab8 RW |
22 | static int acpi_data_get_property_array(struct acpi_device_data *data, |
23 | const char *name, | |
24 | acpi_object_type type, | |
25 | const union acpi_object **obj); | |
26 | ||
ffdcd955 MW |
27 | /* ACPI _DSD device properties UUID: daffd814-6eba-4d8c-8a91-bc9bbf4aa301 */ |
28 | static const u8 prp_uuid[16] = { | |
29 | 0x14, 0xd8, 0xff, 0xda, 0xba, 0x6e, 0x8c, 0x4d, | |
30 | 0x8a, 0x91, 0xbc, 0x9b, 0xbf, 0x4a, 0xa3, 0x01 | |
31 | }; | |
445b0eb0 RW |
32 | /* ACPI _DSD data subnodes UUID: dbb8e3e6-5886-4ba6-8795-1319f52a966b */ |
33 | static const u8 ads_uuid[16] = { | |
34 | 0xe6, 0xe3, 0xb8, 0xdb, 0x86, 0x58, 0xa6, 0x4b, | |
35 | 0x87, 0x95, 0x13, 0x19, 0xf5, 0x2a, 0x96, 0x6b | |
36 | }; | |
37 | ||
38 | static bool acpi_enumerate_nondev_subnodes(acpi_handle scope, | |
39 | const union acpi_object *desc, | |
dfa672fb MW |
40 | struct acpi_device_data *data, |
41 | struct fwnode_handle *parent); | |
445b0eb0 RW |
42 | static bool acpi_extract_properties(const union acpi_object *desc, |
43 | struct acpi_device_data *data); | |
44 | ||
99db5ff7 RW |
45 | static bool acpi_nondev_subnode_extract(const union acpi_object *desc, |
46 | acpi_handle handle, | |
47 | const union acpi_object *link, | |
dfa672fb MW |
48 | struct list_head *list, |
49 | struct fwnode_handle *parent) | |
445b0eb0 | 50 | { |
445b0eb0 | 51 | struct acpi_data_node *dn; |
99db5ff7 | 52 | bool result; |
445b0eb0 RW |
53 | |
54 | dn = kzalloc(sizeof(*dn), GFP_KERNEL); | |
55 | if (!dn) | |
56 | return false; | |
57 | ||
58 | dn->name = link->package.elements[0].string.pointer; | |
59 | dn->fwnode.type = FWNODE_ACPI_DATA; | |
3708184a | 60 | dn->fwnode.ops = &acpi_fwnode_ops; |
dfa672fb | 61 | dn->parent = parent; |
445b0eb0 RW |
62 | INIT_LIST_HEAD(&dn->data.subnodes); |
63 | ||
99db5ff7 | 64 | result = acpi_extract_properties(desc, &dn->data); |
445b0eb0 | 65 | |
99db5ff7 RW |
66 | if (handle) { |
67 | acpi_handle scope; | |
68 | acpi_status status; | |
445b0eb0 | 69 | |
99db5ff7 RW |
70 | /* |
71 | * The scope for the subnode object lookup is the one of the | |
72 | * namespace node (device) containing the object that has | |
73 | * returned the package. That is, it's the scope of that | |
74 | * object's parent. | |
75 | */ | |
76 | status = acpi_get_parent(handle, &scope); | |
77 | if (ACPI_SUCCESS(status) | |
dfa672fb MW |
78 | && acpi_enumerate_nondev_subnodes(scope, desc, &dn->data, |
79 | &dn->fwnode)) | |
99db5ff7 | 80 | result = true; |
dfa672fb MW |
81 | } else if (acpi_enumerate_nondev_subnodes(NULL, desc, &dn->data, |
82 | &dn->fwnode)) { | |
99db5ff7 RW |
83 | result = true; |
84 | } | |
445b0eb0 | 85 | |
99db5ff7 | 86 | if (result) { |
263b4c1a | 87 | dn->handle = handle; |
99db5ff7 | 88 | dn->data.pointer = desc; |
445b0eb0 RW |
89 | list_add_tail(&dn->sibling, list); |
90 | return true; | |
91 | } | |
92 | ||
99db5ff7 | 93 | kfree(dn); |
445b0eb0 | 94 | acpi_handle_debug(handle, "Invalid properties/subnodes data, skipping\n"); |
99db5ff7 RW |
95 | return false; |
96 | } | |
97 | ||
98 | static bool acpi_nondev_subnode_data_ok(acpi_handle handle, | |
99 | const union acpi_object *link, | |
dfa672fb MW |
100 | struct list_head *list, |
101 | struct fwnode_handle *parent) | |
99db5ff7 RW |
102 | { |
103 | struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER }; | |
104 | acpi_status status; | |
105 | ||
106 | status = acpi_evaluate_object_typed(handle, NULL, NULL, &buf, | |
107 | ACPI_TYPE_PACKAGE); | |
108 | if (ACPI_FAILURE(status)) | |
109 | return false; | |
110 | ||
dfa672fb MW |
111 | if (acpi_nondev_subnode_extract(buf.pointer, handle, link, list, |
112 | parent)) | |
99db5ff7 | 113 | return true; |
445b0eb0 | 114 | |
445b0eb0 | 115 | ACPI_FREE(buf.pointer); |
445b0eb0 RW |
116 | return false; |
117 | } | |
118 | ||
99db5ff7 RW |
119 | static bool acpi_nondev_subnode_ok(acpi_handle scope, |
120 | const union acpi_object *link, | |
dfa672fb MW |
121 | struct list_head *list, |
122 | struct fwnode_handle *parent) | |
99db5ff7 RW |
123 | { |
124 | acpi_handle handle; | |
125 | acpi_status status; | |
126 | ||
127 | if (!scope) | |
128 | return false; | |
129 | ||
130 | status = acpi_get_handle(scope, link->package.elements[1].string.pointer, | |
131 | &handle); | |
132 | if (ACPI_FAILURE(status)) | |
133 | return false; | |
134 | ||
dfa672fb | 135 | return acpi_nondev_subnode_data_ok(handle, link, list, parent); |
99db5ff7 RW |
136 | } |
137 | ||
445b0eb0 RW |
138 | static int acpi_add_nondev_subnodes(acpi_handle scope, |
139 | const union acpi_object *links, | |
dfa672fb MW |
140 | struct list_head *list, |
141 | struct fwnode_handle *parent) | |
445b0eb0 RW |
142 | { |
143 | bool ret = false; | |
144 | int i; | |
145 | ||
146 | for (i = 0; i < links->package.count; i++) { | |
99db5ff7 RW |
147 | const union acpi_object *link, *desc; |
148 | acpi_handle handle; | |
149 | bool result; | |
445b0eb0 RW |
150 | |
151 | link = &links->package.elements[i]; | |
99db5ff7 RW |
152 | /* Only two elements allowed. */ |
153 | if (link->package.count != 2) | |
154 | continue; | |
155 | ||
156 | /* The first one must be a string. */ | |
157 | if (link->package.elements[0].type != ACPI_TYPE_STRING) | |
158 | continue; | |
159 | ||
160 | /* The second one may be a string, a reference or a package. */ | |
161 | switch (link->package.elements[1].type) { | |
162 | case ACPI_TYPE_STRING: | |
dfa672fb MW |
163 | result = acpi_nondev_subnode_ok(scope, link, list, |
164 | parent); | |
99db5ff7 RW |
165 | break; |
166 | case ACPI_TYPE_LOCAL_REFERENCE: | |
167 | handle = link->package.elements[1].reference.handle; | |
dfa672fb MW |
168 | result = acpi_nondev_subnode_data_ok(handle, link, list, |
169 | parent); | |
99db5ff7 RW |
170 | break; |
171 | case ACPI_TYPE_PACKAGE: | |
172 | desc = &link->package.elements[1]; | |
dfa672fb MW |
173 | result = acpi_nondev_subnode_extract(desc, NULL, link, |
174 | list, parent); | |
99db5ff7 RW |
175 | break; |
176 | default: | |
177 | result = false; | |
178 | break; | |
179 | } | |
180 | ret = ret || result; | |
445b0eb0 RW |
181 | } |
182 | ||
183 | return ret; | |
184 | } | |
185 | ||
186 | static bool acpi_enumerate_nondev_subnodes(acpi_handle scope, | |
187 | const union acpi_object *desc, | |
dfa672fb MW |
188 | struct acpi_device_data *data, |
189 | struct fwnode_handle *parent) | |
445b0eb0 RW |
190 | { |
191 | int i; | |
192 | ||
193 | /* Look for the ACPI data subnodes UUID. */ | |
194 | for (i = 0; i < desc->package.count; i += 2) { | |
195 | const union acpi_object *uuid, *links; | |
196 | ||
197 | uuid = &desc->package.elements[i]; | |
198 | links = &desc->package.elements[i + 1]; | |
199 | ||
200 | /* | |
201 | * The first element must be a UUID and the second one must be | |
202 | * a package. | |
203 | */ | |
204 | if (uuid->type != ACPI_TYPE_BUFFER || uuid->buffer.length != 16 | |
205 | || links->type != ACPI_TYPE_PACKAGE) | |
206 | break; | |
207 | ||
208 | if (memcmp(uuid->buffer.pointer, ads_uuid, sizeof(ads_uuid))) | |
209 | continue; | |
210 | ||
dfa672fb MW |
211 | return acpi_add_nondev_subnodes(scope, links, &data->subnodes, |
212 | parent); | |
445b0eb0 RW |
213 | } |
214 | ||
215 | return false; | |
216 | } | |
ffdcd955 MW |
217 | |
218 | static bool acpi_property_value_ok(const union acpi_object *value) | |
219 | { | |
220 | int j; | |
221 | ||
222 | /* | |
223 | * The value must be an integer, a string, a reference, or a package | |
224 | * whose every element must be an integer, a string, or a reference. | |
225 | */ | |
226 | switch (value->type) { | |
227 | case ACPI_TYPE_INTEGER: | |
228 | case ACPI_TYPE_STRING: | |
229 | case ACPI_TYPE_LOCAL_REFERENCE: | |
230 | return true; | |
231 | ||
232 | case ACPI_TYPE_PACKAGE: | |
233 | for (j = 0; j < value->package.count; j++) | |
234 | switch (value->package.elements[j].type) { | |
235 | case ACPI_TYPE_INTEGER: | |
236 | case ACPI_TYPE_STRING: | |
237 | case ACPI_TYPE_LOCAL_REFERENCE: | |
238 | continue; | |
239 | ||
240 | default: | |
241 | return false; | |
242 | } | |
243 | ||
244 | return true; | |
245 | } | |
246 | return false; | |
247 | } | |
248 | ||
249 | static bool acpi_properties_format_valid(const union acpi_object *properties) | |
250 | { | |
251 | int i; | |
252 | ||
253 | for (i = 0; i < properties->package.count; i++) { | |
254 | const union acpi_object *property; | |
255 | ||
256 | property = &properties->package.elements[i]; | |
257 | /* | |
258 | * Only two elements allowed, the first one must be a string and | |
259 | * the second one has to satisfy certain conditions. | |
260 | */ | |
261 | if (property->package.count != 2 | |
262 | || property->package.elements[0].type != ACPI_TYPE_STRING | |
263 | || !acpi_property_value_ok(&property->package.elements[1])) | |
264 | return false; | |
265 | } | |
266 | return true; | |
267 | } | |
268 | ||
733e6251 MW |
269 | static void acpi_init_of_compatible(struct acpi_device *adev) |
270 | { | |
271 | const union acpi_object *of_compatible; | |
733e6251 MW |
272 | int ret; |
273 | ||
3a7a2ab8 RW |
274 | ret = acpi_data_get_property_array(&adev->data, "compatible", |
275 | ACPI_TYPE_STRING, &of_compatible); | |
733e6251 MW |
276 | if (ret) { |
277 | ret = acpi_dev_get_property(adev, "compatible", | |
278 | ACPI_TYPE_STRING, &of_compatible); | |
279 | if (ret) { | |
5c53b262 RW |
280 | if (adev->parent |
281 | && adev->parent->flags.of_compatible_ok) | |
282 | goto out; | |
283 | ||
733e6251 MW |
284 | return; |
285 | } | |
286 | } | |
287 | adev->data.of_compatible = of_compatible; | |
5c53b262 RW |
288 | |
289 | out: | |
290 | adev->flags.of_compatible_ok = 1; | |
733e6251 MW |
291 | } |
292 | ||
bd8191cc RW |
293 | static bool acpi_extract_properties(const union acpi_object *desc, |
294 | struct acpi_device_data *data) | |
ffdcd955 | 295 | { |
ffdcd955 MW |
296 | int i; |
297 | ||
ffdcd955 | 298 | if (desc->package.count % 2) |
bd8191cc | 299 | return false; |
ffdcd955 MW |
300 | |
301 | /* Look for the device properties UUID. */ | |
302 | for (i = 0; i < desc->package.count; i += 2) { | |
303 | const union acpi_object *uuid, *properties; | |
304 | ||
305 | uuid = &desc->package.elements[i]; | |
306 | properties = &desc->package.elements[i + 1]; | |
307 | ||
308 | /* | |
309 | * The first element must be a UUID and the second one must be | |
310 | * a package. | |
311 | */ | |
312 | if (uuid->type != ACPI_TYPE_BUFFER || uuid->buffer.length != 16 | |
313 | || properties->type != ACPI_TYPE_PACKAGE) | |
314 | break; | |
315 | ||
316 | if (memcmp(uuid->buffer.pointer, prp_uuid, sizeof(prp_uuid))) | |
317 | continue; | |
318 | ||
319 | /* | |
320 | * We found the matching UUID. Now validate the format of the | |
321 | * package immediately following it. | |
322 | */ | |
323 | if (!acpi_properties_format_valid(properties)) | |
324 | break; | |
325 | ||
bd8191cc RW |
326 | data->properties = properties; |
327 | return true; | |
328 | } | |
733e6251 | 329 | |
bd8191cc RW |
330 | return false; |
331 | } | |
5c53b262 | 332 | |
bd8191cc RW |
333 | void acpi_init_properties(struct acpi_device *adev) |
334 | { | |
335 | struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER }; | |
336 | struct acpi_hardware_id *hwid; | |
337 | acpi_status status; | |
338 | bool acpi_of = false; | |
339 | ||
445b0eb0 RW |
340 | INIT_LIST_HEAD(&adev->data.subnodes); |
341 | ||
bd8191cc RW |
342 | /* |
343 | * Check if ACPI_DT_NAMESPACE_HID is present and inthat case we fill in | |
344 | * Device Tree compatible properties for this device. | |
345 | */ | |
346 | list_for_each_entry(hwid, &adev->pnp.ids, list) { | |
347 | if (!strcmp(hwid->id, ACPI_DT_NAMESPACE_HID)) { | |
348 | acpi_of = true; | |
349 | break; | |
350 | } | |
ffdcd955 MW |
351 | } |
352 | ||
bd8191cc RW |
353 | status = acpi_evaluate_object_typed(adev->handle, "_DSD", NULL, &buf, |
354 | ACPI_TYPE_PACKAGE); | |
355 | if (ACPI_FAILURE(status)) | |
356 | goto out; | |
357 | ||
358 | if (acpi_extract_properties(buf.pointer, &adev->data)) { | |
359 | adev->data.pointer = buf.pointer; | |
360 | if (acpi_of) | |
361 | acpi_init_of_compatible(adev); | |
445b0eb0 | 362 | } |
dfa672fb MW |
363 | if (acpi_enumerate_nondev_subnodes(adev->handle, buf.pointer, |
364 | &adev->data, acpi_fwnode_handle(adev))) | |
445b0eb0 RW |
365 | adev->data.pointer = buf.pointer; |
366 | ||
367 | if (!adev->data.pointer) { | |
bd8191cc RW |
368 | acpi_handle_debug(adev->handle, "Invalid _DSD data, skipping\n"); |
369 | ACPI_FREE(buf.pointer); | |
370 | } | |
5c53b262 RW |
371 | |
372 | out: | |
373 | if (acpi_of && !adev->flags.of_compatible_ok) | |
374 | acpi_handle_info(adev->handle, | |
ee892094 | 375 | ACPI_DT_NAMESPACE_HID " requires 'compatible' property\n"); |
ffdcd955 MW |
376 | } |
377 | ||
445b0eb0 RW |
378 | static void acpi_destroy_nondev_subnodes(struct list_head *list) |
379 | { | |
380 | struct acpi_data_node *dn, *next; | |
381 | ||
382 | if (list_empty(list)) | |
383 | return; | |
384 | ||
385 | list_for_each_entry_safe_reverse(dn, next, list, sibling) { | |
386 | acpi_destroy_nondev_subnodes(&dn->data.subnodes); | |
263b4c1a | 387 | wait_for_completion(&dn->kobj_done); |
445b0eb0 RW |
388 | list_del(&dn->sibling); |
389 | ACPI_FREE((void *)dn->data.pointer); | |
390 | kfree(dn); | |
391 | } | |
392 | } | |
393 | ||
ffdcd955 MW |
394 | void acpi_free_properties(struct acpi_device *adev) |
395 | { | |
445b0eb0 | 396 | acpi_destroy_nondev_subnodes(&adev->data.subnodes); |
ffdcd955 | 397 | ACPI_FREE((void *)adev->data.pointer); |
733e6251 | 398 | adev->data.of_compatible = NULL; |
ffdcd955 MW |
399 | adev->data.pointer = NULL; |
400 | adev->data.properties = NULL; | |
401 | } | |
402 | ||
403 | /** | |
3a7a2ab8 RW |
404 | * acpi_data_get_property - return an ACPI property with given name |
405 | * @data: ACPI device deta object to get the property from | |
ffdcd955 MW |
406 | * @name: Name of the property |
407 | * @type: Expected property type | |
408 | * @obj: Location to store the property value (if not %NULL) | |
409 | * | |
410 | * Look up a property with @name and store a pointer to the resulting ACPI | |
411 | * object at the location pointed to by @obj if found. | |
412 | * | |
413 | * Callers must not attempt to free the returned objects. These objects will be | |
3a7a2ab8 | 414 | * freed by the ACPI core automatically during the removal of @data. |
ffdcd955 MW |
415 | * |
416 | * Return: %0 if property with @name has been found (success), | |
417 | * %-EINVAL if the arguments are invalid, | |
3c60f114 | 418 | * %-EINVAL if the property doesn't exist, |
ffdcd955 MW |
419 | * %-EPROTO if the property value type doesn't match @type. |
420 | */ | |
3a7a2ab8 RW |
421 | static int acpi_data_get_property(struct acpi_device_data *data, |
422 | const char *name, acpi_object_type type, | |
423 | const union acpi_object **obj) | |
ffdcd955 MW |
424 | { |
425 | const union acpi_object *properties; | |
426 | int i; | |
427 | ||
3a7a2ab8 | 428 | if (!data || !name) |
ffdcd955 MW |
429 | return -EINVAL; |
430 | ||
3a7a2ab8 | 431 | if (!data->pointer || !data->properties) |
3c60f114 | 432 | return -EINVAL; |
ffdcd955 | 433 | |
3a7a2ab8 | 434 | properties = data->properties; |
ffdcd955 MW |
435 | for (i = 0; i < properties->package.count; i++) { |
436 | const union acpi_object *propname, *propvalue; | |
437 | const union acpi_object *property; | |
438 | ||
439 | property = &properties->package.elements[i]; | |
440 | ||
441 | propname = &property->package.elements[0]; | |
442 | propvalue = &property->package.elements[1]; | |
443 | ||
444 | if (!strcmp(name, propname->string.pointer)) { | |
445 | if (type != ACPI_TYPE_ANY && propvalue->type != type) | |
446 | return -EPROTO; | |
3c60f114 | 447 | if (obj) |
ffdcd955 MW |
448 | *obj = propvalue; |
449 | ||
450 | return 0; | |
451 | } | |
452 | } | |
3c60f114 | 453 | return -EINVAL; |
ffdcd955 | 454 | } |
3a7a2ab8 RW |
455 | |
456 | /** | |
457 | * acpi_dev_get_property - return an ACPI property with given name. | |
458 | * @adev: ACPI device to get the property from. | |
459 | * @name: Name of the property. | |
460 | * @type: Expected property type. | |
461 | * @obj: Location to store the property value (if not %NULL). | |
462 | */ | |
463 | int acpi_dev_get_property(struct acpi_device *adev, const char *name, | |
464 | acpi_object_type type, const union acpi_object **obj) | |
465 | { | |
466 | return adev ? acpi_data_get_property(&adev->data, name, type, obj) : -EINVAL; | |
467 | } | |
ffdcd955 MW |
468 | EXPORT_SYMBOL_GPL(acpi_dev_get_property); |
469 | ||
3a7a2ab8 RW |
470 | static struct acpi_device_data *acpi_device_data_of_node(struct fwnode_handle *fwnode) |
471 | { | |
472 | if (fwnode->type == FWNODE_ACPI) { | |
473 | struct acpi_device *adev = to_acpi_device_node(fwnode); | |
474 | return &adev->data; | |
475 | } else if (fwnode->type == FWNODE_ACPI_DATA) { | |
476 | struct acpi_data_node *dn = to_acpi_data_node(fwnode); | |
477 | return &dn->data; | |
478 | } | |
479 | return NULL; | |
480 | } | |
481 | ||
ffdcd955 | 482 | /** |
3a7a2ab8 RW |
483 | * acpi_node_prop_get - return an ACPI property with given name. |
484 | * @fwnode: Firmware node to get the property from. | |
485 | * @propname: Name of the property. | |
486 | * @valptr: Location to store a pointer to the property value (if not %NULL). | |
487 | */ | |
488 | int acpi_node_prop_get(struct fwnode_handle *fwnode, const char *propname, | |
489 | void **valptr) | |
490 | { | |
491 | return acpi_data_get_property(acpi_device_data_of_node(fwnode), | |
492 | propname, ACPI_TYPE_ANY, | |
493 | (const union acpi_object **)valptr); | |
494 | } | |
495 | ||
496 | /** | |
497 | * acpi_data_get_property_array - return an ACPI array property with given name | |
498 | * @adev: ACPI data object to get the property from | |
ffdcd955 MW |
499 | * @name: Name of the property |
500 | * @type: Expected type of array elements | |
501 | * @obj: Location to store a pointer to the property value (if not NULL) | |
502 | * | |
503 | * Look up an array property with @name and store a pointer to the resulting | |
504 | * ACPI object at the location pointed to by @obj if found. | |
505 | * | |
506 | * Callers must not attempt to free the returned objects. Those objects will be | |
3a7a2ab8 | 507 | * freed by the ACPI core automatically during the removal of @data. |
ffdcd955 MW |
508 | * |
509 | * Return: %0 if array property (package) with @name has been found (success), | |
510 | * %-EINVAL if the arguments are invalid, | |
3c60f114 | 511 | * %-EINVAL if the property doesn't exist, |
ffdcd955 MW |
512 | * %-EPROTO if the property is not a package or the type of its elements |
513 | * doesn't match @type. | |
514 | */ | |
3a7a2ab8 RW |
515 | static int acpi_data_get_property_array(struct acpi_device_data *data, |
516 | const char *name, | |
517 | acpi_object_type type, | |
518 | const union acpi_object **obj) | |
ffdcd955 MW |
519 | { |
520 | const union acpi_object *prop; | |
521 | int ret, i; | |
522 | ||
3a7a2ab8 | 523 | ret = acpi_data_get_property(data, name, ACPI_TYPE_PACKAGE, &prop); |
ffdcd955 MW |
524 | if (ret) |
525 | return ret; | |
526 | ||
527 | if (type != ACPI_TYPE_ANY) { | |
528 | /* Check that all elements are of correct type. */ | |
529 | for (i = 0; i < prop->package.count; i++) | |
530 | if (prop->package.elements[i].type != type) | |
531 | return -EPROTO; | |
532 | } | |
533 | if (obj) | |
534 | *obj = prop; | |
535 | ||
536 | return 0; | |
537 | } | |
ffdcd955 MW |
538 | |
539 | /** | |
b60e4ea4 MW |
540 | * __acpi_node_get_property_reference - returns handle to the referenced object |
541 | * @fwnode: Firmware node to get the property from | |
504a3374 | 542 | * @propname: Name of the property |
ffdcd955 | 543 | * @index: Index of the reference to return |
b60e4ea4 | 544 | * @num_args: Maximum number of arguments after each reference |
ffdcd955 MW |
545 | * @args: Location to store the returned reference with optional arguments |
546 | * | |
547 | * Find property with @name, verifify that it is a package containing at least | |
548 | * one object reference and if so, store the ACPI device object pointer to the | |
60ba032e RW |
549 | * target object in @args->adev. If the reference includes arguments, store |
550 | * them in the @args->args[] array. | |
ffdcd955 | 551 | * |
60ba032e RW |
552 | * If there's more than one reference in the property value package, @index is |
553 | * used to select the one to return. | |
ffdcd955 | 554 | * |
b60e4ea4 MW |
555 | * It is possible to leave holes in the property value set like in the |
556 | * example below: | |
557 | * | |
558 | * Package () { | |
559 | * "cs-gpios", | |
560 | * Package () { | |
561 | * ^GPIO, 19, 0, 0, | |
562 | * ^GPIO, 20, 0, 0, | |
563 | * 0, | |
564 | * ^GPIO, 21, 0, 0, | |
565 | * } | |
566 | * } | |
567 | * | |
568 | * Calling this function with index %2 return %-ENOENT and with index %3 | |
569 | * returns the last entry. If the property does not contain any more values | |
570 | * %-ENODATA is returned. The NULL entry must be single integer and | |
571 | * preferably contain value %0. | |
572 | * | |
ffdcd955 MW |
573 | * Return: %0 on success, negative error code on failure. |
574 | */ | |
b60e4ea4 MW |
575 | int __acpi_node_get_property_reference(struct fwnode_handle *fwnode, |
576 | const char *propname, size_t index, size_t num_args, | |
577 | struct acpi_reference_args *args) | |
ffdcd955 MW |
578 | { |
579 | const union acpi_object *element, *end; | |
580 | const union acpi_object *obj; | |
b60e4ea4 | 581 | struct acpi_device_data *data; |
ffdcd955 MW |
582 | struct acpi_device *device; |
583 | int ret, idx = 0; | |
584 | ||
b60e4ea4 MW |
585 | data = acpi_device_data_of_node(fwnode); |
586 | if (!data) | |
587 | return -EINVAL; | |
588 | ||
504a3374 | 589 | ret = acpi_data_get_property(data, propname, ACPI_TYPE_ANY, &obj); |
ffdcd955 MW |
590 | if (ret) |
591 | return ret; | |
592 | ||
593 | /* | |
594 | * The simplest case is when the value is a single reference. Just | |
595 | * return that reference then. | |
596 | */ | |
597 | if (obj->type == ACPI_TYPE_LOCAL_REFERENCE) { | |
60ba032e | 598 | if (index) |
ffdcd955 MW |
599 | return -EINVAL; |
600 | ||
601 | ret = acpi_bus_get_device(obj->reference.handle, &device); | |
602 | if (ret) | |
603 | return ret; | |
604 | ||
605 | args->adev = device; | |
606 | args->nargs = 0; | |
607 | return 0; | |
608 | } | |
609 | ||
610 | /* | |
611 | * If it is not a single reference, then it is a package of | |
612 | * references followed by number of ints as follows: | |
613 | * | |
614 | * Package () { REF, INT, REF, INT, INT } | |
615 | * | |
616 | * The index argument is then used to determine which reference | |
617 | * the caller wants (along with the arguments). | |
618 | */ | |
619 | if (obj->type != ACPI_TYPE_PACKAGE || index >= obj->package.count) | |
620 | return -EPROTO; | |
621 | ||
622 | element = obj->package.elements; | |
623 | end = element + obj->package.count; | |
624 | ||
625 | while (element < end) { | |
626 | u32 nargs, i; | |
627 | ||
b60e4ea4 MW |
628 | if (element->type == ACPI_TYPE_LOCAL_REFERENCE) { |
629 | ret = acpi_bus_get_device(element->reference.handle, | |
630 | &device); | |
631 | if (ret) | |
632 | return -ENODEV; | |
633 | ||
634 | nargs = 0; | |
635 | element++; | |
636 | ||
637 | /* assume following integer elements are all args */ | |
638 | for (i = 0; element + i < end && i < num_args; i++) { | |
639 | int type = element[i].type; | |
640 | ||
641 | if (type == ACPI_TYPE_INTEGER) | |
642 | nargs++; | |
643 | else if (type == ACPI_TYPE_LOCAL_REFERENCE) | |
644 | break; | |
645 | else | |
646 | return -EPROTO; | |
647 | } | |
ffdcd955 | 648 | |
b60e4ea4 | 649 | if (nargs > MAX_ACPI_REFERENCE_ARGS) |
60ba032e | 650 | return -EPROTO; |
ffdcd955 | 651 | |
b60e4ea4 MW |
652 | if (idx == index) { |
653 | args->adev = device; | |
654 | args->nargs = nargs; | |
655 | for (i = 0; i < nargs; i++) | |
656 | args->args[i] = element[i].integer.value; | |
ffdcd955 | 657 | |
b60e4ea4 MW |
658 | return 0; |
659 | } | |
660 | ||
661 | element += nargs; | |
662 | } else if (element->type == ACPI_TYPE_INTEGER) { | |
663 | if (idx == index) | |
664 | return -ENOENT; | |
665 | element++; | |
666 | } else { | |
667 | return -EPROTO; | |
ffdcd955 MW |
668 | } |
669 | ||
b60e4ea4 | 670 | idx++; |
ffdcd955 MW |
671 | } |
672 | ||
b60e4ea4 | 673 | return -ENODATA; |
504a3374 | 674 | } |
b60e4ea4 | 675 | EXPORT_SYMBOL_GPL(__acpi_node_get_property_reference); |
b31384fa | 676 | |
3a7a2ab8 RW |
677 | static int acpi_data_prop_read_single(struct acpi_device_data *data, |
678 | const char *propname, | |
679 | enum dev_prop_type proptype, void *val) | |
b31384fa RW |
680 | { |
681 | const union acpi_object *obj; | |
682 | int ret; | |
683 | ||
684 | if (!val) | |
685 | return -EINVAL; | |
686 | ||
687 | if (proptype >= DEV_PROP_U8 && proptype <= DEV_PROP_U64) { | |
3a7a2ab8 | 688 | ret = acpi_data_get_property(data, propname, ACPI_TYPE_INTEGER, &obj); |
b31384fa RW |
689 | if (ret) |
690 | return ret; | |
691 | ||
692 | switch (proptype) { | |
693 | case DEV_PROP_U8: | |
694 | if (obj->integer.value > U8_MAX) | |
695 | return -EOVERFLOW; | |
696 | *(u8 *)val = obj->integer.value; | |
697 | break; | |
698 | case DEV_PROP_U16: | |
699 | if (obj->integer.value > U16_MAX) | |
700 | return -EOVERFLOW; | |
701 | *(u16 *)val = obj->integer.value; | |
702 | break; | |
703 | case DEV_PROP_U32: | |
704 | if (obj->integer.value > U32_MAX) | |
705 | return -EOVERFLOW; | |
706 | *(u32 *)val = obj->integer.value; | |
707 | break; | |
708 | default: | |
709 | *(u64 *)val = obj->integer.value; | |
710 | break; | |
711 | } | |
712 | } else if (proptype == DEV_PROP_STRING) { | |
3a7a2ab8 | 713 | ret = acpi_data_get_property(data, propname, ACPI_TYPE_STRING, &obj); |
b31384fa RW |
714 | if (ret) |
715 | return ret; | |
716 | ||
717 | *(char **)val = obj->string.pointer; | |
b0b027ce SA |
718 | |
719 | return 1; | |
b31384fa RW |
720 | } else { |
721 | ret = -EINVAL; | |
722 | } | |
723 | return ret; | |
724 | } | |
725 | ||
3a7a2ab8 RW |
726 | int acpi_dev_prop_read_single(struct acpi_device *adev, const char *propname, |
727 | enum dev_prop_type proptype, void *val) | |
728 | { | |
b0b027ce SA |
729 | int ret; |
730 | ||
731 | if (!adev) | |
732 | return -EINVAL; | |
733 | ||
734 | ret = acpi_data_prop_read_single(&adev->data, propname, proptype, val); | |
735 | if (ret < 0 || proptype != ACPI_TYPE_STRING) | |
736 | return ret; | |
737 | return 0; | |
3a7a2ab8 RW |
738 | } |
739 | ||
b31384fa RW |
740 | static int acpi_copy_property_array_u8(const union acpi_object *items, u8 *val, |
741 | size_t nval) | |
742 | { | |
743 | int i; | |
744 | ||
745 | for (i = 0; i < nval; i++) { | |
746 | if (items[i].type != ACPI_TYPE_INTEGER) | |
747 | return -EPROTO; | |
748 | if (items[i].integer.value > U8_MAX) | |
749 | return -EOVERFLOW; | |
750 | ||
751 | val[i] = items[i].integer.value; | |
752 | } | |
753 | return 0; | |
754 | } | |
755 | ||
756 | static int acpi_copy_property_array_u16(const union acpi_object *items, | |
757 | u16 *val, size_t nval) | |
758 | { | |
759 | int i; | |
760 | ||
761 | for (i = 0; i < nval; i++) { | |
762 | if (items[i].type != ACPI_TYPE_INTEGER) | |
763 | return -EPROTO; | |
764 | if (items[i].integer.value > U16_MAX) | |
765 | return -EOVERFLOW; | |
766 | ||
767 | val[i] = items[i].integer.value; | |
768 | } | |
769 | return 0; | |
770 | } | |
771 | ||
772 | static int acpi_copy_property_array_u32(const union acpi_object *items, | |
773 | u32 *val, size_t nval) | |
774 | { | |
775 | int i; | |
776 | ||
777 | for (i = 0; i < nval; i++) { | |
778 | if (items[i].type != ACPI_TYPE_INTEGER) | |
779 | return -EPROTO; | |
780 | if (items[i].integer.value > U32_MAX) | |
781 | return -EOVERFLOW; | |
782 | ||
783 | val[i] = items[i].integer.value; | |
784 | } | |
785 | return 0; | |
786 | } | |
787 | ||
788 | static int acpi_copy_property_array_u64(const union acpi_object *items, | |
789 | u64 *val, size_t nval) | |
790 | { | |
791 | int i; | |
792 | ||
793 | for (i = 0; i < nval; i++) { | |
794 | if (items[i].type != ACPI_TYPE_INTEGER) | |
795 | return -EPROTO; | |
796 | ||
797 | val[i] = items[i].integer.value; | |
798 | } | |
799 | return 0; | |
800 | } | |
801 | ||
802 | static int acpi_copy_property_array_string(const union acpi_object *items, | |
803 | char **val, size_t nval) | |
804 | { | |
805 | int i; | |
806 | ||
807 | for (i = 0; i < nval; i++) { | |
808 | if (items[i].type != ACPI_TYPE_STRING) | |
809 | return -EPROTO; | |
810 | ||
811 | val[i] = items[i].string.pointer; | |
812 | } | |
b0b027ce | 813 | return nval; |
b31384fa RW |
814 | } |
815 | ||
3a7a2ab8 RW |
816 | static int acpi_data_prop_read(struct acpi_device_data *data, |
817 | const char *propname, | |
818 | enum dev_prop_type proptype, | |
819 | void *val, size_t nval) | |
b31384fa RW |
820 | { |
821 | const union acpi_object *obj; | |
822 | const union acpi_object *items; | |
823 | int ret; | |
824 | ||
825 | if (val && nval == 1) { | |
3a7a2ab8 | 826 | ret = acpi_data_prop_read_single(data, propname, proptype, val); |
b0b027ce | 827 | if (ret >= 0) |
b31384fa RW |
828 | return ret; |
829 | } | |
830 | ||
3a7a2ab8 | 831 | ret = acpi_data_get_property_array(data, propname, ACPI_TYPE_ANY, &obj); |
b31384fa RW |
832 | if (ret) |
833 | return ret; | |
834 | ||
835 | if (!val) | |
836 | return obj->package.count; | |
b31384fa | 837 | |
b0b027ce | 838 | if (proptype != DEV_PROP_STRING && nval > obj->package.count) |
b31384fa | 839 | return -EOVERFLOW; |
7dc59dc9 AS |
840 | else if (nval <= 0) |
841 | return -EINVAL; | |
b31384fa RW |
842 | |
843 | items = obj->package.elements; | |
7dc59dc9 | 844 | |
b31384fa RW |
845 | switch (proptype) { |
846 | case DEV_PROP_U8: | |
847 | ret = acpi_copy_property_array_u8(items, (u8 *)val, nval); | |
848 | break; | |
849 | case DEV_PROP_U16: | |
850 | ret = acpi_copy_property_array_u16(items, (u16 *)val, nval); | |
851 | break; | |
852 | case DEV_PROP_U32: | |
853 | ret = acpi_copy_property_array_u32(items, (u32 *)val, nval); | |
854 | break; | |
855 | case DEV_PROP_U64: | |
856 | ret = acpi_copy_property_array_u64(items, (u64 *)val, nval); | |
857 | break; | |
858 | case DEV_PROP_STRING: | |
b0b027ce SA |
859 | ret = acpi_copy_property_array_string( |
860 | items, (char **)val, | |
861 | min_t(u32, nval, obj->package.count)); | |
b31384fa RW |
862 | break; |
863 | default: | |
864 | ret = -EINVAL; | |
865 | break; | |
866 | } | |
867 | return ret; | |
868 | } | |
3a7a2ab8 RW |
869 | |
870 | int acpi_dev_prop_read(struct acpi_device *adev, const char *propname, | |
871 | enum dev_prop_type proptype, void *val, size_t nval) | |
872 | { | |
873 | return adev ? acpi_data_prop_read(&adev->data, propname, proptype, val, nval) : -EINVAL; | |
874 | } | |
875 | ||
876 | /** | |
877 | * acpi_node_prop_read - retrieve the value of an ACPI property with given name. | |
878 | * @fwnode: Firmware node to get the property from. | |
879 | * @propname: Name of the property. | |
880 | * @proptype: Expected property type. | |
881 | * @val: Location to store the property value (if not %NULL). | |
882 | * @nval: Size of the array pointed to by @val. | |
883 | * | |
884 | * If @val is %NULL, return the number of array elements comprising the value | |
885 | * of the property. Otherwise, read at most @nval values to the array at the | |
886 | * location pointed to by @val. | |
887 | */ | |
888 | int acpi_node_prop_read(struct fwnode_handle *fwnode, const char *propname, | |
889 | enum dev_prop_type proptype, void *val, size_t nval) | |
890 | { | |
891 | return acpi_data_prop_read(acpi_device_data_of_node(fwnode), | |
892 | propname, proptype, val, nval); | |
893 | } | |
504a3374 RW |
894 | |
895 | /** | |
34055190 MW |
896 | * acpi_get_next_subnode - Return the next child node handle for a fwnode |
897 | * @fwnode: Firmware node to find the next child node for. | |
504a3374 RW |
898 | * @child: Handle to one of the device's child nodes or a null handle. |
899 | */ | |
34055190 | 900 | struct fwnode_handle *acpi_get_next_subnode(struct fwnode_handle *fwnode, |
504a3374 RW |
901 | struct fwnode_handle *child) |
902 | { | |
34055190 | 903 | struct acpi_device *adev = to_acpi_device_node(fwnode); |
504a3374 RW |
904 | struct list_head *head, *next; |
905 | ||
504a3374 | 906 | if (!child || child->type == FWNODE_ACPI) { |
34055190 MW |
907 | if (adev) |
908 | head = &adev->children; | |
909 | else | |
910 | goto nondev; | |
911 | ||
504a3374 RW |
912 | if (list_empty(head)) |
913 | goto nondev; | |
914 | ||
915 | if (child) { | |
916 | adev = to_acpi_device_node(child); | |
917 | next = adev->node.next; | |
918 | if (next == head) { | |
919 | child = NULL; | |
920 | goto nondev; | |
921 | } | |
922 | adev = list_entry(next, struct acpi_device, node); | |
923 | } else { | |
924 | adev = list_first_entry(head, struct acpi_device, node); | |
925 | } | |
926 | return acpi_fwnode_handle(adev); | |
927 | } | |
928 | ||
929 | nondev: | |
930 | if (!child || child->type == FWNODE_ACPI_DATA) { | |
34055190 | 931 | struct acpi_data_node *data = to_acpi_data_node(fwnode); |
504a3374 RW |
932 | struct acpi_data_node *dn; |
933 | ||
34055190 MW |
934 | if (adev) |
935 | head = &adev->data.subnodes; | |
936 | else if (data) | |
937 | head = &data->data.subnodes; | |
938 | else | |
939 | return NULL; | |
940 | ||
504a3374 RW |
941 | if (list_empty(head)) |
942 | return NULL; | |
943 | ||
944 | if (child) { | |
945 | dn = to_acpi_data_node(child); | |
946 | next = dn->sibling.next; | |
947 | if (next == head) | |
948 | return NULL; | |
949 | ||
950 | dn = list_entry(next, struct acpi_data_node, sibling); | |
951 | } else { | |
952 | dn = list_first_entry(head, struct acpi_data_node, sibling); | |
953 | } | |
954 | return &dn->fwnode; | |
955 | } | |
956 | return NULL; | |
957 | } | |
dfa672fb MW |
958 | |
959 | /** | |
960 | * acpi_node_get_parent - Return parent fwnode of this fwnode | |
961 | * @fwnode: Firmware node whose parent to get | |
962 | * | |
963 | * Returns parent node of an ACPI device or data firmware node or %NULL if | |
964 | * not available. | |
965 | */ | |
966 | struct fwnode_handle *acpi_node_get_parent(struct fwnode_handle *fwnode) | |
967 | { | |
968 | if (is_acpi_data_node(fwnode)) { | |
969 | /* All data nodes have parent pointer so just return that */ | |
970 | return to_acpi_data_node(fwnode)->parent; | |
971 | } else if (is_acpi_device_node(fwnode)) { | |
972 | acpi_handle handle, parent_handle; | |
973 | ||
974 | handle = to_acpi_device_node(fwnode)->handle; | |
975 | if (ACPI_SUCCESS(acpi_get_parent(handle, &parent_handle))) { | |
976 | struct acpi_device *adev; | |
977 | ||
978 | if (!acpi_bus_get_device(parent_handle, &adev)) | |
979 | return acpi_fwnode_handle(adev); | |
980 | } | |
981 | } | |
982 | ||
983 | return NULL; | |
984 | } | |
79389a83 MW |
985 | |
986 | /** | |
987 | * acpi_graph_get_next_endpoint - Get next endpoint ACPI firmware node | |
988 | * @fwnode: Pointer to the parent firmware node | |
989 | * @prev: Previous endpoint node or %NULL to get the first | |
990 | * | |
991 | * Looks up next endpoint ACPI firmware node below a given @fwnode. Returns | |
992 | * %NULL if there is no next endpoint, ERR_PTR() in case of error. In case | |
993 | * of success the next endpoint is returned. | |
994 | */ | |
995 | struct fwnode_handle *acpi_graph_get_next_endpoint(struct fwnode_handle *fwnode, | |
996 | struct fwnode_handle *prev) | |
997 | { | |
998 | struct fwnode_handle *port = NULL; | |
999 | struct fwnode_handle *endpoint; | |
1000 | ||
1001 | if (!prev) { | |
1002 | do { | |
1003 | port = fwnode_get_next_child_node(fwnode, port); | |
1004 | /* Ports must have port property */ | |
1005 | if (fwnode_property_present(port, "port")) | |
1006 | break; | |
1007 | } while (port); | |
1008 | } else { | |
1009 | port = fwnode_get_parent(prev); | |
1010 | } | |
1011 | ||
1012 | if (!port) | |
1013 | return NULL; | |
1014 | ||
1015 | endpoint = fwnode_get_next_child_node(port, prev); | |
1016 | while (!endpoint) { | |
1017 | port = fwnode_get_next_child_node(fwnode, port); | |
1018 | if (!port) | |
1019 | break; | |
1020 | if (fwnode_property_present(port, "port")) | |
1021 | endpoint = fwnode_get_next_child_node(port, NULL); | |
1022 | } | |
1023 | ||
1024 | if (endpoint) { | |
1025 | /* Endpoints must have "endpoint" property */ | |
1026 | if (!fwnode_property_present(endpoint, "endpoint")) | |
1027 | return ERR_PTR(-EPROTO); | |
1028 | } | |
1029 | ||
1030 | return endpoint; | |
1031 | } | |
1032 | ||
1033 | /** | |
1034 | * acpi_graph_get_child_prop_value - Return a child with a given property value | |
1035 | * @fwnode: device fwnode | |
1036 | * @prop_name: The name of the property to look for | |
1037 | * @val: the desired property value | |
1038 | * | |
1039 | * Return the port node corresponding to a given port number. Returns | |
1040 | * the child node on success, NULL otherwise. | |
1041 | */ | |
1042 | static struct fwnode_handle *acpi_graph_get_child_prop_value( | |
1043 | struct fwnode_handle *fwnode, const char *prop_name, unsigned int val) | |
1044 | { | |
1045 | struct fwnode_handle *child; | |
1046 | ||
1047 | fwnode_for_each_child_node(fwnode, child) { | |
1048 | u32 nr; | |
1049 | ||
b5212f57 | 1050 | if (fwnode_property_read_u32(child, prop_name, &nr)) |
79389a83 MW |
1051 | continue; |
1052 | ||
1053 | if (val == nr) | |
1054 | return child; | |
1055 | } | |
1056 | ||
1057 | return NULL; | |
1058 | } | |
1059 | ||
1060 | ||
1061 | /** | |
1062 | * acpi_graph_get_remote_enpoint - Parses and returns remote end of an endpoint | |
1063 | * @fwnode: Endpoint firmware node pointing to a remote device | |
1064 | * @parent: Firmware node of remote port parent is filled here if not %NULL | |
1065 | * @port: Firmware node of remote port is filled here if not %NULL | |
1066 | * @endpoint: Firmware node of remote endpoint is filled here if not %NULL | |
1067 | * | |
1068 | * Function parses remote end of ACPI firmware remote endpoint and fills in | |
1069 | * fields requested by the caller. Returns %0 in case of success and | |
1070 | * negative errno otherwise. | |
1071 | */ | |
1072 | int acpi_graph_get_remote_endpoint(struct fwnode_handle *fwnode, | |
1073 | struct fwnode_handle **parent, | |
1074 | struct fwnode_handle **port, | |
1075 | struct fwnode_handle **endpoint) | |
1076 | { | |
1077 | unsigned int port_nr, endpoint_nr; | |
1078 | struct acpi_reference_args args; | |
1079 | int ret; | |
1080 | ||
1081 | memset(&args, 0, sizeof(args)); | |
1082 | ret = acpi_node_get_property_reference(fwnode, "remote-endpoint", 0, | |
1083 | &args); | |
1084 | if (ret) | |
1085 | return ret; | |
1086 | ||
1087 | /* | |
1088 | * Always require two arguments with the reference: port and | |
1089 | * endpoint indices. | |
1090 | */ | |
1091 | if (args.nargs != 2) | |
1092 | return -EPROTO; | |
1093 | ||
1094 | fwnode = acpi_fwnode_handle(args.adev); | |
1095 | port_nr = args.args[0]; | |
1096 | endpoint_nr = args.args[1]; | |
1097 | ||
1098 | if (parent) | |
1099 | *parent = fwnode; | |
1100 | ||
1101 | if (!port && !endpoint) | |
1102 | return 0; | |
1103 | ||
1104 | fwnode = acpi_graph_get_child_prop_value(fwnode, "port", port_nr); | |
1105 | if (!fwnode) | |
1106 | return -EPROTO; | |
1107 | ||
1108 | if (port) | |
1109 | *port = fwnode; | |
1110 | ||
1111 | if (!endpoint) | |
1112 | return 0; | |
1113 | ||
1114 | fwnode = acpi_graph_get_child_prop_value(fwnode, "endpoint", | |
1115 | endpoint_nr); | |
1116 | if (!fwnode) | |
1117 | return -EPROTO; | |
1118 | ||
1119 | *endpoint = fwnode; | |
1120 | ||
1121 | return 0; | |
1122 | } | |
3708184a | 1123 | |
2294b3af SA |
1124 | static bool acpi_fwnode_device_is_available(struct fwnode_handle *fwnode) |
1125 | { | |
1126 | if (!is_acpi_device_node(fwnode)) | |
1127 | return false; | |
1128 | ||
1129 | return acpi_device_is_present(to_acpi_device_node(fwnode)); | |
1130 | } | |
1131 | ||
3708184a SA |
1132 | static bool acpi_fwnode_property_present(struct fwnode_handle *fwnode, |
1133 | const char *propname) | |
1134 | { | |
1135 | return !acpi_node_prop_get(fwnode, propname, NULL); | |
1136 | } | |
1137 | ||
1138 | static int acpi_fwnode_property_read_int_array(struct fwnode_handle *fwnode, | |
1139 | const char *propname, | |
1140 | unsigned int elem_size, | |
1141 | void *val, size_t nval) | |
1142 | { | |
1143 | enum dev_prop_type type; | |
1144 | ||
1145 | switch (elem_size) { | |
1146 | case sizeof(u8): | |
1147 | type = DEV_PROP_U8; | |
1148 | break; | |
1149 | case sizeof(u16): | |
1150 | type = DEV_PROP_U16; | |
1151 | break; | |
1152 | case sizeof(u32): | |
1153 | type = DEV_PROP_U32; | |
1154 | break; | |
1155 | case sizeof(u64): | |
1156 | type = DEV_PROP_U64; | |
1157 | break; | |
1158 | default: | |
1159 | return -ENXIO; | |
1160 | } | |
1161 | ||
1162 | return acpi_node_prop_read(fwnode, propname, type, val, nval); | |
1163 | } | |
1164 | ||
1165 | static int acpi_fwnode_property_read_string_array(struct fwnode_handle *fwnode, | |
1166 | const char *propname, | |
1167 | const char **val, size_t nval) | |
1168 | { | |
1169 | return acpi_node_prop_read(fwnode, propname, DEV_PROP_STRING, | |
1170 | val, nval); | |
1171 | } | |
1172 | ||
1173 | static struct fwnode_handle * | |
1174 | acpi_fwnode_get_named_child_node(struct fwnode_handle *fwnode, | |
1175 | const char *childname) | |
1176 | { | |
1177 | struct fwnode_handle *child; | |
1178 | ||
1179 | /* | |
1180 | * Find first matching named child node of this fwnode. | |
1181 | * For ACPI this will be a data only sub-node. | |
1182 | */ | |
1183 | fwnode_for_each_child_node(fwnode, child) | |
1184 | if (acpi_data_node_match(child, childname)) | |
1185 | return child; | |
1186 | ||
1187 | return NULL; | |
1188 | } | |
1189 | ||
3b27d00e SA |
1190 | static struct fwnode_handle * |
1191 | acpi_fwnode_graph_get_next_endpoint(struct fwnode_handle *fwnode, | |
1192 | struct fwnode_handle *prev) | |
1193 | { | |
1194 | struct fwnode_handle *endpoint; | |
1195 | ||
1196 | endpoint = acpi_graph_get_next_endpoint(fwnode, prev); | |
1197 | if (IS_ERR(endpoint)) | |
1198 | return NULL; | |
1199 | ||
1200 | return endpoint; | |
1201 | } | |
1202 | ||
1203 | static struct fwnode_handle * | |
1204 | acpi_fwnode_graph_get_remote_endpoint(struct fwnode_handle *fwnode) | |
1205 | { | |
1206 | struct fwnode_handle *endpoint = NULL; | |
1207 | ||
1208 | acpi_graph_get_remote_endpoint(fwnode, NULL, NULL, &endpoint); | |
1209 | ||
1210 | return endpoint; | |
1211 | } | |
1212 | ||
1213 | static int acpi_fwnode_graph_parse_endpoint(struct fwnode_handle *fwnode, | |
1214 | struct fwnode_endpoint *endpoint) | |
1215 | { | |
1216 | struct fwnode_handle *port_fwnode = fwnode_get_parent(fwnode); | |
1217 | ||
1218 | endpoint->local_fwnode = fwnode; | |
1219 | ||
1220 | fwnode_property_read_u32(port_fwnode, "port", &endpoint->port); | |
1221 | fwnode_property_read_u32(fwnode, "endpoint", &endpoint->id); | |
1222 | ||
1223 | return 0; | |
1224 | } | |
1225 | ||
3708184a | 1226 | const struct fwnode_operations acpi_fwnode_ops = { |
2294b3af | 1227 | .device_is_available = acpi_fwnode_device_is_available, |
3708184a SA |
1228 | .property_present = acpi_fwnode_property_present, |
1229 | .property_read_int_array = acpi_fwnode_property_read_int_array, | |
1230 | .property_read_string_array = acpi_fwnode_property_read_string_array, | |
1231 | .get_parent = acpi_node_get_parent, | |
1232 | .get_next_child_node = acpi_get_next_subnode, | |
1233 | .get_named_child_node = acpi_fwnode_get_named_child_node, | |
3b27d00e SA |
1234 | .graph_get_next_endpoint = acpi_fwnode_graph_get_next_endpoint, |
1235 | .graph_get_remote_endpoint = acpi_fwnode_graph_get_remote_endpoint, | |
1236 | .graph_get_port_parent = acpi_node_get_parent, | |
1237 | .graph_parse_endpoint = acpi_fwnode_graph_parse_endpoint, | |
3708184a | 1238 | }; |