drivers/acpi/property.c

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This source file includes following definitions.
acpi_nondev_subnode_extract
acpi_nondev_subnode_data_ok
acpi_nondev_subnode_ok
acpi_add_nondev_subnodes
acpi_enumerate_nondev_subnodes
acpi_property_value_ok
acpi_properties_format_valid
acpi_init_of_compatible
acpi_is_property_guid
acpi_data_add_props
acpi_extract_properties
acpi_init_properties
acpi_destroy_nondev_subnodes
acpi_free_properties
acpi_data_get_property
acpi_dev_get_property
acpi_device_data_of_node
acpi_node_prop_get
acpi_data_get_property_array
acpi_fwnode_get_named_child_node
__acpi_node_get_property_reference
acpi_data_prop_read_single
acpi_dev_prop_read_single
acpi_copy_property_array_u8
acpi_copy_property_array_u16
acpi_copy_property_array_u32
acpi_copy_property_array_u64
acpi_copy_property_array_string
acpi_data_prop_read
acpi_dev_prop_read
acpi_node_prop_read
acpi_get_next_subnode
acpi_node_get_parent
is_acpi_graph_node
acpi_graph_get_next_endpoint
acpi_graph_get_child_prop_value
acpi_graph_get_remote_endpoint
acpi_fwnode_device_is_available
acpi_fwnode_property_present
acpi_fwnode_property_read_int_array
acpi_fwnode_property_read_string_array
acpi_fwnode_get_reference_args
acpi_fwnode_get_parent
acpi_fwnode_graph_parse_endpoint
acpi_fwnode_device_get_match_data
is_acpi_device_node
is_acpi_data_node
   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * ACPI device specific properties support.
   4  *
   5  * Copyright (C) 2014, Intel Corporation
   6  * All rights reserved.
   7  *
   8  * Authors: Mika Westerberg <mika.westerberg@linux.intel.com>
   9  *          Darren Hart <dvhart@linux.intel.com>
  10  *          Rafael J. Wysocki <rafael.j.wysocki@intel.com>
  11  */
  12 
  13 #include <linux/acpi.h>
  14 #include <linux/device.h>
  15 #include <linux/export.h>
  16 
  17 #include "internal.h"
  18 
  19 static int acpi_data_get_property_array(const struct acpi_device_data *data,
  20                                         const char *name,
  21                                         acpi_object_type type,
  22                                         const union acpi_object **obj);
  23 
  24 /*
  25  * The GUIDs here are made equivalent to each other in order to avoid extra
  26  * complexity in the properties handling code, with the caveat that the
  27  * kernel will accept certain combinations of GUID and properties that are
  28  * not defined without a warning. For instance if any of the properties
  29  * from different GUID appear in a property list of another, it will be
  30  * accepted by the kernel. Firmware validation tools should catch these.
  31  */
  32 static const guid_t prp_guids[] = {
  33         /* ACPI _DSD device properties GUID: daffd814-6eba-4d8c-8a91-bc9bbf4aa301 */
  34         GUID_INIT(0xdaffd814, 0x6eba, 0x4d8c,
  35                   0x8a, 0x91, 0xbc, 0x9b, 0xbf, 0x4a, 0xa3, 0x01),
  36         /* Hotplug in D3 GUID: 6211e2c0-58a3-4af3-90e1-927a4e0c55a4 */
  37         GUID_INIT(0x6211e2c0, 0x58a3, 0x4af3,
  38                   0x90, 0xe1, 0x92, 0x7a, 0x4e, 0x0c, 0x55, 0xa4),
  39         /* External facing port GUID: efcc06cc-73ac-4bc3-bff0-76143807c389 */
  40         GUID_INIT(0xefcc06cc, 0x73ac, 0x4bc3,
  41                   0xbf, 0xf0, 0x76, 0x14, 0x38, 0x07, 0xc3, 0x89),
  42         /* Thunderbolt GUID for IMR_VALID: c44d002f-69f9-4e7d-a904-a7baabdf43f7 */
  43         GUID_INIT(0xc44d002f, 0x69f9, 0x4e7d,
  44                   0xa9, 0x04, 0xa7, 0xba, 0xab, 0xdf, 0x43, 0xf7),
  45         /* Thunderbolt GUID for WAKE_SUPPORTED: 6c501103-c189-4296-ba72-9bf5a26ebe5d */
  46         GUID_INIT(0x6c501103, 0xc189, 0x4296,
  47                   0xba, 0x72, 0x9b, 0xf5, 0xa2, 0x6e, 0xbe, 0x5d),
  48 };
  49 
  50 /* ACPI _DSD data subnodes GUID: dbb8e3e6-5886-4ba6-8795-1319f52a966b */
  51 static const guid_t ads_guid =
  52         GUID_INIT(0xdbb8e3e6, 0x5886, 0x4ba6,
  53                   0x87, 0x95, 0x13, 0x19, 0xf5, 0x2a, 0x96, 0x6b);
  54 
  55 static bool acpi_enumerate_nondev_subnodes(acpi_handle scope,
  56                                            const union acpi_object *desc,
  57                                            struct acpi_device_data *data,
  58                                            struct fwnode_handle *parent);
  59 static bool acpi_extract_properties(const union acpi_object *desc,
  60                                     struct acpi_device_data *data);
  61 
  62 static bool acpi_nondev_subnode_extract(const union acpi_object *desc,
  63                                         acpi_handle handle,
  64                                         const union acpi_object *link,
  65                                         struct list_head *list,
  66                                         struct fwnode_handle *parent)
  67 {
  68         struct acpi_data_node *dn;
  69         bool result;
  70 
  71         dn = kzalloc(sizeof(*dn), GFP_KERNEL);
  72         if (!dn)
  73                 return false;
  74 
  75         dn->name = link->package.elements[0].string.pointer;
  76         dn->fwnode.ops = &acpi_data_fwnode_ops;
  77         dn->parent = parent;
  78         INIT_LIST_HEAD(&dn->data.properties);
  79         INIT_LIST_HEAD(&dn->data.subnodes);
  80 
  81         result = acpi_extract_properties(desc, &dn->data);
  82 
  83         if (handle) {
  84                 acpi_handle scope;
  85                 acpi_status status;
  86 
  87                 /*
  88                  * The scope for the subnode object lookup is the one of the
  89                  * namespace node (device) containing the object that has
  90                  * returned the package.  That is, it's the scope of that
  91                  * object's parent.
  92                  */
  93                 status = acpi_get_parent(handle, &scope);
  94                 if (ACPI_SUCCESS(status)
  95                     && acpi_enumerate_nondev_subnodes(scope, desc, &dn->data,
  96                                                       &dn->fwnode))
  97                         result = true;
  98         } else if (acpi_enumerate_nondev_subnodes(NULL, desc, &dn->data,
  99                                                   &dn->fwnode)) {
 100                 result = true;
 101         }
 102 
 103         if (result) {
 104                 dn->handle = handle;
 105                 dn->data.pointer = desc;
 106                 list_add_tail(&dn->sibling, list);
 107                 return true;
 108         }
 109 
 110         kfree(dn);
 111         acpi_handle_debug(handle, "Invalid properties/subnodes data, skipping\n");
 112         return false;
 113 }
 114 
 115 static bool acpi_nondev_subnode_data_ok(acpi_handle handle,
 116                                         const union acpi_object *link,
 117                                         struct list_head *list,
 118                                         struct fwnode_handle *parent)
 119 {
 120         struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER };
 121         acpi_status status;
 122 
 123         status = acpi_evaluate_object_typed(handle, NULL, NULL, &buf,
 124                                             ACPI_TYPE_PACKAGE);
 125         if (ACPI_FAILURE(status))
 126                 return false;
 127 
 128         if (acpi_nondev_subnode_extract(buf.pointer, handle, link, list,
 129                                         parent))
 130                 return true;
 131 
 132         ACPI_FREE(buf.pointer);
 133         return false;
 134 }
 135 
 136 static bool acpi_nondev_subnode_ok(acpi_handle scope,
 137                                    const union acpi_object *link,
 138                                    struct list_head *list,
 139                                    struct fwnode_handle *parent)
 140 {
 141         acpi_handle handle;
 142         acpi_status status;
 143 
 144         if (!scope)
 145                 return false;
 146 
 147         status = acpi_get_handle(scope, link->package.elements[1].string.pointer,
 148                                  &handle);
 149         if (ACPI_FAILURE(status))
 150                 return false;
 151 
 152         return acpi_nondev_subnode_data_ok(handle, link, list, parent);
 153 }
 154 
 155 static int acpi_add_nondev_subnodes(acpi_handle scope,
 156                                     const union acpi_object *links,
 157                                     struct list_head *list,
 158                                     struct fwnode_handle *parent)
 159 {
 160         bool ret = false;
 161         int i;
 162 
 163         for (i = 0; i < links->package.count; i++) {
 164                 const union acpi_object *link, *desc;
 165                 acpi_handle handle;
 166                 bool result;
 167 
 168                 link = &links->package.elements[i];
 169                 /* Only two elements allowed. */
 170                 if (link->package.count != 2)
 171                         continue;
 172 
 173                 /* The first one must be a string. */
 174                 if (link->package.elements[0].type != ACPI_TYPE_STRING)
 175                         continue;
 176 
 177                 /* The second one may be a string, a reference or a package. */
 178                 switch (link->package.elements[1].type) {
 179                 case ACPI_TYPE_STRING:
 180                         result = acpi_nondev_subnode_ok(scope, link, list,
 181                                                          parent);
 182                         break;
 183                 case ACPI_TYPE_LOCAL_REFERENCE:
 184                         handle = link->package.elements[1].reference.handle;
 185                         result = acpi_nondev_subnode_data_ok(handle, link, list,
 186                                                              parent);
 187                         break;
 188                 case ACPI_TYPE_PACKAGE:
 189                         desc = &link->package.elements[1];
 190                         result = acpi_nondev_subnode_extract(desc, NULL, link,
 191                                                              list, parent);
 192                         break;
 193                 default:
 194                         result = false;
 195                         break;
 196                 }
 197                 ret = ret || result;
 198         }
 199 
 200         return ret;
 201 }
 202 
 203 static bool acpi_enumerate_nondev_subnodes(acpi_handle scope,
 204                                            const union acpi_object *desc,
 205                                            struct acpi_device_data *data,
 206                                            struct fwnode_handle *parent)
 207 {
 208         int i;
 209 
 210         /* Look for the ACPI data subnodes GUID. */
 211         for (i = 0; i < desc->package.count; i += 2) {
 212                 const union acpi_object *guid, *links;
 213 
 214                 guid = &desc->package.elements[i];
 215                 links = &desc->package.elements[i + 1];
 216 
 217                 /*
 218                  * The first element must be a GUID and the second one must be
 219                  * a package.
 220                  */
 221                 if (guid->type != ACPI_TYPE_BUFFER ||
 222                     guid->buffer.length != 16 ||
 223                     links->type != ACPI_TYPE_PACKAGE)
 224                         break;
 225 
 226                 if (!guid_equal((guid_t *)guid->buffer.pointer, &ads_guid))
 227                         continue;
 228 
 229                 return acpi_add_nondev_subnodes(scope, links, &data->subnodes,
 230                                                 parent);
 231         }
 232 
 233         return false;
 234 }
 235 
 236 static bool acpi_property_value_ok(const union acpi_object *value)
 237 {
 238         int j;
 239 
 240         /*
 241          * The value must be an integer, a string, a reference, or a package
 242          * whose every element must be an integer, a string, or a reference.
 243          */
 244         switch (value->type) {
 245         case ACPI_TYPE_INTEGER:
 246         case ACPI_TYPE_STRING:
 247         case ACPI_TYPE_LOCAL_REFERENCE:
 248                 return true;
 249 
 250         case ACPI_TYPE_PACKAGE:
 251                 for (j = 0; j < value->package.count; j++)
 252                         switch (value->package.elements[j].type) {
 253                         case ACPI_TYPE_INTEGER:
 254                         case ACPI_TYPE_STRING:
 255                         case ACPI_TYPE_LOCAL_REFERENCE:
 256                                 continue;
 257 
 258                         default:
 259                                 return false;
 260                         }
 261 
 262                 return true;
 263         }
 264         return false;
 265 }
 266 
 267 static bool acpi_properties_format_valid(const union acpi_object *properties)
 268 {
 269         int i;
 270 
 271         for (i = 0; i < properties->package.count; i++) {
 272                 const union acpi_object *property;
 273 
 274                 property = &properties->package.elements[i];
 275                 /*
 276                  * Only two elements allowed, the first one must be a string and
 277                  * the second one has to satisfy certain conditions.
 278                  */
 279                 if (property->package.count != 2
 280                     || property->package.elements[0].type != ACPI_TYPE_STRING
 281                     || !acpi_property_value_ok(&property->package.elements[1]))
 282                         return false;
 283         }
 284         return true;
 285 }
 286 
 287 static void acpi_init_of_compatible(struct acpi_device *adev)
 288 {
 289         const union acpi_object *of_compatible;
 290         int ret;
 291 
 292         ret = acpi_data_get_property_array(&adev->data, "compatible",
 293                                            ACPI_TYPE_STRING, &of_compatible);
 294         if (ret) {
 295                 ret = acpi_dev_get_property(adev, "compatible",
 296                                             ACPI_TYPE_STRING, &of_compatible);
 297                 if (ret) {
 298                         if (adev->parent
 299                             && adev->parent->flags.of_compatible_ok)
 300                                 goto out;
 301 
 302                         return;
 303                 }
 304         }
 305         adev->data.of_compatible = of_compatible;
 306 
 307  out:
 308         adev->flags.of_compatible_ok = 1;
 309 }
 310 
 311 static bool acpi_is_property_guid(const guid_t *guid)
 312 {
 313         int i;
 314 
 315         for (i = 0; i < ARRAY_SIZE(prp_guids); i++) {
 316                 if (guid_equal(guid, &prp_guids[i]))
 317                         return true;
 318         }
 319 
 320         return false;
 321 }
 322 
 323 struct acpi_device_properties *
 324 acpi_data_add_props(struct acpi_device_data *data, const guid_t *guid,
 325                     const union acpi_object *properties)
 326 {
 327         struct acpi_device_properties *props;
 328 
 329         props = kzalloc(sizeof(*props), GFP_KERNEL);
 330         if (props) {
 331                 INIT_LIST_HEAD(&props->list);
 332                 props->guid = guid;
 333                 props->properties = properties;
 334                 list_add_tail(&props->list, &data->properties);
 335         }
 336 
 337         return props;
 338 }
 339 
 340 static bool acpi_extract_properties(const union acpi_object *desc,
 341                                     struct acpi_device_data *data)
 342 {
 343         int i;
 344 
 345         if (desc->package.count % 2)
 346                 return false;
 347 
 348         /* Look for the device properties GUID. */
 349         for (i = 0; i < desc->package.count; i += 2) {
 350                 const union acpi_object *guid, *properties;
 351 
 352                 guid = &desc->package.elements[i];
 353                 properties = &desc->package.elements[i + 1];
 354 
 355                 /*
 356                  * The first element must be a GUID and the second one must be
 357                  * a package.
 358                  */
 359                 if (guid->type != ACPI_TYPE_BUFFER ||
 360                     guid->buffer.length != 16 ||
 361                     properties->type != ACPI_TYPE_PACKAGE)
 362                         break;
 363 
 364                 if (!acpi_is_property_guid((guid_t *)guid->buffer.pointer))
 365                         continue;
 366 
 367                 /*
 368                  * We found the matching GUID. Now validate the format of the
 369                  * package immediately following it.
 370                  */
 371                 if (!acpi_properties_format_valid(properties))
 372                         continue;
 373 
 374                 acpi_data_add_props(data, (const guid_t *)guid->buffer.pointer,
 375                                     properties);
 376         }
 377 
 378         return !list_empty(&data->properties);
 379 }
 380 
 381 void acpi_init_properties(struct acpi_device *adev)
 382 {
 383         struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER };
 384         struct acpi_hardware_id *hwid;
 385         acpi_status status;
 386         bool acpi_of = false;
 387 
 388         INIT_LIST_HEAD(&adev->data.properties);
 389         INIT_LIST_HEAD(&adev->data.subnodes);
 390 
 391         if (!adev->handle)
 392                 return;
 393 
 394         /*
 395          * Check if ACPI_DT_NAMESPACE_HID is present and inthat case we fill in
 396          * Device Tree compatible properties for this device.
 397          */
 398         list_for_each_entry(hwid, &adev->pnp.ids, list) {
 399                 if (!strcmp(hwid->id, ACPI_DT_NAMESPACE_HID)) {
 400                         acpi_of = true;
 401                         break;
 402                 }
 403         }
 404 
 405         status = acpi_evaluate_object_typed(adev->handle, "_DSD", NULL, &buf,
 406                                             ACPI_TYPE_PACKAGE);
 407         if (ACPI_FAILURE(status))
 408                 goto out;
 409 
 410         if (acpi_extract_properties(buf.pointer, &adev->data)) {
 411                 adev->data.pointer = buf.pointer;
 412                 if (acpi_of)
 413                         acpi_init_of_compatible(adev);
 414         }
 415         if (acpi_enumerate_nondev_subnodes(adev->handle, buf.pointer,
 416                                         &adev->data, acpi_fwnode_handle(adev)))
 417                 adev->data.pointer = buf.pointer;
 418 
 419         if (!adev->data.pointer) {
 420                 acpi_handle_debug(adev->handle, "Invalid _DSD data, skipping\n");
 421                 ACPI_FREE(buf.pointer);
 422         }
 423 
 424  out:
 425         if (acpi_of && !adev->flags.of_compatible_ok)
 426                 acpi_handle_info(adev->handle,
 427                          ACPI_DT_NAMESPACE_HID " requires 'compatible' property\n");
 428 
 429         if (!adev->data.pointer)
 430                 acpi_extract_apple_properties(adev);
 431 }
 432 
 433 static void acpi_destroy_nondev_subnodes(struct list_head *list)
 434 {
 435         struct acpi_data_node *dn, *next;
 436 
 437         if (list_empty(list))
 438                 return;
 439 
 440         list_for_each_entry_safe_reverse(dn, next, list, sibling) {
 441                 acpi_destroy_nondev_subnodes(&dn->data.subnodes);
 442                 wait_for_completion(&dn->kobj_done);
 443                 list_del(&dn->sibling);
 444                 ACPI_FREE((void *)dn->data.pointer);
 445                 kfree(dn);
 446         }
 447 }
 448 
 449 void acpi_free_properties(struct acpi_device *adev)
 450 {
 451         struct acpi_device_properties *props, *tmp;
 452 
 453         acpi_destroy_nondev_subnodes(&adev->data.subnodes);
 454         ACPI_FREE((void *)adev->data.pointer);
 455         adev->data.of_compatible = NULL;
 456         adev->data.pointer = NULL;
 457         list_for_each_entry_safe(props, tmp, &adev->data.properties, list) {
 458                 list_del(&props->list);
 459                 kfree(props);
 460         }
 461 }
 462 
 463 /**
 464  * acpi_data_get_property - return an ACPI property with given name
 465  * @data: ACPI device deta object to get the property from
 466  * @name: Name of the property
 467  * @type: Expected property type
 468  * @obj: Location to store the property value (if not %NULL)
 469  *
 470  * Look up a property with @name and store a pointer to the resulting ACPI
 471  * object at the location pointed to by @obj if found.
 472  *
 473  * Callers must not attempt to free the returned objects.  These objects will be
 474  * freed by the ACPI core automatically during the removal of @data.
 475  *
 476  * Return: %0 if property with @name has been found (success),
 477  *         %-EINVAL if the arguments are invalid,
 478  *         %-EINVAL if the property doesn't exist,
 479  *         %-EPROTO if the property value type doesn't match @type.
 480  */
 481 static int acpi_data_get_property(const struct acpi_device_data *data,
 482                                   const char *name, acpi_object_type type,
 483                                   const union acpi_object **obj)
 484 {
 485         const struct acpi_device_properties *props;
 486 
 487         if (!data || !name)
 488                 return -EINVAL;
 489 
 490         if (!data->pointer || list_empty(&data->properties))
 491                 return -EINVAL;
 492 
 493         list_for_each_entry(props, &data->properties, list) {
 494                 const union acpi_object *properties;
 495                 unsigned int i;
 496 
 497                 properties = props->properties;
 498                 for (i = 0; i < properties->package.count; i++) {
 499                         const union acpi_object *propname, *propvalue;
 500                         const union acpi_object *property;
 501 
 502                         property = &properties->package.elements[i];
 503 
 504                         propname = &property->package.elements[0];
 505                         propvalue = &property->package.elements[1];
 506 
 507                         if (!strcmp(name, propname->string.pointer)) {
 508                                 if (type != ACPI_TYPE_ANY &&
 509                                     propvalue->type != type)
 510                                         return -EPROTO;
 511                                 if (obj)
 512                                         *obj = propvalue;
 513 
 514                                 return 0;
 515                         }
 516                 }
 517         }
 518         return -EINVAL;
 519 }
 520 
 521 /**
 522  * acpi_dev_get_property - return an ACPI property with given name.
 523  * @adev: ACPI device to get the property from.
 524  * @name: Name of the property.
 525  * @type: Expected property type.
 526  * @obj: Location to store the property value (if not %NULL).
 527  */
 528 int acpi_dev_get_property(const struct acpi_device *adev, const char *name,
 529                           acpi_object_type type, const union acpi_object **obj)
 530 {
 531         return adev ? acpi_data_get_property(&adev->data, name, type, obj) : -EINVAL;
 532 }
 533 EXPORT_SYMBOL_GPL(acpi_dev_get_property);
 534 
 535 static const struct acpi_device_data *
 536 acpi_device_data_of_node(const struct fwnode_handle *fwnode)
 537 {
 538         if (is_acpi_device_node(fwnode)) {
 539                 const struct acpi_device *adev = to_acpi_device_node(fwnode);
 540                 return &adev->data;
 541         } else if (is_acpi_data_node(fwnode)) {
 542                 const struct acpi_data_node *dn = to_acpi_data_node(fwnode);
 543                 return &dn->data;
 544         }
 545         return NULL;
 546 }
 547 
 548 /**
 549  * acpi_node_prop_get - return an ACPI property with given name.
 550  * @fwnode: Firmware node to get the property from.
 551  * @propname: Name of the property.
 552  * @valptr: Location to store a pointer to the property value (if not %NULL).
 553  */
 554 int acpi_node_prop_get(const struct fwnode_handle *fwnode,
 555                        const char *propname, void **valptr)
 556 {
 557         return acpi_data_get_property(acpi_device_data_of_node(fwnode),
 558                                       propname, ACPI_TYPE_ANY,
 559                                       (const union acpi_object **)valptr);
 560 }
 561 
 562 /**
 563  * acpi_data_get_property_array - return an ACPI array property with given name
 564  * @adev: ACPI data object to get the property from
 565  * @name: Name of the property
 566  * @type: Expected type of array elements
 567  * @obj: Location to store a pointer to the property value (if not NULL)
 568  *
 569  * Look up an array property with @name and store a pointer to the resulting
 570  * ACPI object at the location pointed to by @obj if found.
 571  *
 572  * Callers must not attempt to free the returned objects.  Those objects will be
 573  * freed by the ACPI core automatically during the removal of @data.
 574  *
 575  * Return: %0 if array property (package) with @name has been found (success),
 576  *         %-EINVAL if the arguments are invalid,
 577  *         %-EINVAL if the property doesn't exist,
 578  *         %-EPROTO if the property is not a package or the type of its elements
 579  *           doesn't match @type.
 580  */
 581 static int acpi_data_get_property_array(const struct acpi_device_data *data,
 582                                         const char *name,
 583                                         acpi_object_type type,
 584                                         const union acpi_object **obj)
 585 {
 586         const union acpi_object *prop;
 587         int ret, i;
 588 
 589         ret = acpi_data_get_property(data, name, ACPI_TYPE_PACKAGE, &prop);
 590         if (ret)
 591                 return ret;
 592 
 593         if (type != ACPI_TYPE_ANY) {
 594                 /* Check that all elements are of correct type. */
 595                 for (i = 0; i < prop->package.count; i++)
 596                         if (prop->package.elements[i].type != type)
 597                                 return -EPROTO;
 598         }
 599         if (obj)
 600                 *obj = prop;
 601 
 602         return 0;
 603 }
 604 
 605 static struct fwnode_handle *
 606 acpi_fwnode_get_named_child_node(const struct fwnode_handle *fwnode,
 607                                  const char *childname)
 608 {
 609         char name[ACPI_PATH_SEGMENT_LENGTH];
 610         struct fwnode_handle *child;
 611         struct acpi_buffer path;
 612         acpi_status status;
 613 
 614         path.length = sizeof(name);
 615         path.pointer = name;
 616 
 617         fwnode_for_each_child_node(fwnode, child) {
 618                 if (is_acpi_data_node(child)) {
 619                         if (acpi_data_node_match(child, childname))
 620                                 return child;
 621                         continue;
 622                 }
 623 
 624                 status = acpi_get_name(ACPI_HANDLE_FWNODE(child),
 625                                        ACPI_SINGLE_NAME, &path);
 626                 if (ACPI_FAILURE(status))
 627                         break;
 628 
 629                 if (!strncmp(name, childname, ACPI_NAMESEG_SIZE))
 630                         return child;
 631         }
 632 
 633         return NULL;
 634 }
 635 
 636 /**
 637  * __acpi_node_get_property_reference - returns handle to the referenced object
 638  * @fwnode: Firmware node to get the property from
 639  * @propname: Name of the property
 640  * @index: Index of the reference to return
 641  * @num_args: Maximum number of arguments after each reference
 642  * @args: Location to store the returned reference with optional arguments
 643  *
 644  * Find property with @name, verifify that it is a package containing at least
 645  * one object reference and if so, store the ACPI device object pointer to the
 646  * target object in @args->adev.  If the reference includes arguments, store
 647  * them in the @args->args[] array.
 648  *
 649  * If there's more than one reference in the property value package, @index is
 650  * used to select the one to return.
 651  *
 652  * It is possible to leave holes in the property value set like in the
 653  * example below:
 654  *
 655  * Package () {
 656  *     "cs-gpios",
 657  *     Package () {
 658  *        ^GPIO, 19, 0, 0,
 659  *        ^GPIO, 20, 0, 0,
 660  *        0,
 661  *        ^GPIO, 21, 0, 0,
 662  *     }
 663  * }
 664  *
 665  * Calling this function with index %2 or index %3 return %-ENOENT. If the
 666  * property does not contain any more values %-ENOENT is returned. The NULL
 667  * entry must be single integer and preferably contain value %0.
 668  *
 669  * Return: %0 on success, negative error code on failure.
 670  */
 671 int __acpi_node_get_property_reference(const struct fwnode_handle *fwnode,
 672         const char *propname, size_t index, size_t num_args,
 673         struct fwnode_reference_args *args)
 674 {
 675         const union acpi_object *element, *end;
 676         const union acpi_object *obj;
 677         const struct acpi_device_data *data;
 678         struct acpi_device *device;
 679         int ret, idx = 0;
 680 
 681         data = acpi_device_data_of_node(fwnode);
 682         if (!data)
 683                 return -ENOENT;
 684 
 685         ret = acpi_data_get_property(data, propname, ACPI_TYPE_ANY, &obj);
 686         if (ret)
 687                 return ret == -EINVAL ? -ENOENT : -EINVAL;
 688 
 689         /*
 690          * The simplest case is when the value is a single reference.  Just
 691          * return that reference then.
 692          */
 693         if (obj->type == ACPI_TYPE_LOCAL_REFERENCE) {
 694                 if (index)
 695                         return -EINVAL;
 696 
 697                 ret = acpi_bus_get_device(obj->reference.handle, &device);
 698                 if (ret)
 699                         return ret == -ENODEV ? -EINVAL : ret;
 700 
 701                 args->fwnode = acpi_fwnode_handle(device);
 702                 args->nargs = 0;
 703                 return 0;
 704         }
 705 
 706         /*
 707          * If it is not a single reference, then it is a package of
 708          * references followed by number of ints as follows:
 709          *
 710          *  Package () { REF, INT, REF, INT, INT }
 711          *
 712          * The index argument is then used to determine which reference
 713          * the caller wants (along with the arguments).
 714          */
 715         if (obj->type != ACPI_TYPE_PACKAGE)
 716                 return -EINVAL;
 717         if (index >= obj->package.count)
 718                 return -ENOENT;
 719 
 720         element = obj->package.elements;
 721         end = element + obj->package.count;
 722 
 723         while (element < end) {
 724                 u32 nargs, i;
 725 
 726                 if (element->type == ACPI_TYPE_LOCAL_REFERENCE) {
 727                         struct fwnode_handle *ref_fwnode;
 728 
 729                         ret = acpi_bus_get_device(element->reference.handle,
 730                                                   &device);
 731                         if (ret)
 732                                 return -EINVAL;
 733 
 734                         nargs = 0;
 735                         element++;
 736 
 737                         /*
 738                          * Find the referred data extension node under the
 739                          * referred device node.
 740                          */
 741                         for (ref_fwnode = acpi_fwnode_handle(device);
 742                              element < end && element->type == ACPI_TYPE_STRING;
 743                              element++) {
 744                                 ref_fwnode = acpi_fwnode_get_named_child_node(
 745                                         ref_fwnode, element->string.pointer);
 746                                 if (!ref_fwnode)
 747                                         return -EINVAL;
 748                         }
 749 
 750                         /* assume following integer elements are all args */
 751                         for (i = 0; element + i < end && i < num_args; i++) {
 752                                 int type = element[i].type;
 753 
 754                                 if (type == ACPI_TYPE_INTEGER)
 755                                         nargs++;
 756                                 else if (type == ACPI_TYPE_LOCAL_REFERENCE)
 757                                         break;
 758                                 else
 759                                         return -EINVAL;
 760                         }
 761 
 762                         if (nargs > NR_FWNODE_REFERENCE_ARGS)
 763                                 return -EINVAL;
 764 
 765                         if (idx == index) {
 766                                 args->fwnode = ref_fwnode;
 767                                 args->nargs = nargs;
 768                                 for (i = 0; i < nargs; i++)
 769                                         args->args[i] = element[i].integer.value;
 770 
 771                                 return 0;
 772                         }
 773 
 774                         element += nargs;
 775                 } else if (element->type == ACPI_TYPE_INTEGER) {
 776                         if (idx == index)
 777                                 return -ENOENT;
 778                         element++;
 779                 } else {
 780                         return -EINVAL;
 781                 }
 782 
 783                 idx++;
 784         }
 785 
 786         return -ENOENT;
 787 }
 788 EXPORT_SYMBOL_GPL(__acpi_node_get_property_reference);
 789 
 790 static int acpi_data_prop_read_single(const struct acpi_device_data *data,
 791                                       const char *propname,
 792                                       enum dev_prop_type proptype, void *val)
 793 {
 794         const union acpi_object *obj;
 795         int ret;
 796 
 797         if (!val)
 798                 return -EINVAL;
 799 
 800         if (proptype >= DEV_PROP_U8 && proptype <= DEV_PROP_U64) {
 801                 ret = acpi_data_get_property(data, propname, ACPI_TYPE_INTEGER, &obj);
 802                 if (ret)
 803                         return ret;
 804 
 805                 switch (proptype) {
 806                 case DEV_PROP_U8:
 807                         if (obj->integer.value > U8_MAX)
 808                                 return -EOVERFLOW;
 809                         *(u8 *)val = obj->integer.value;
 810                         break;
 811                 case DEV_PROP_U16:
 812                         if (obj->integer.value > U16_MAX)
 813                                 return -EOVERFLOW;
 814                         *(u16 *)val = obj->integer.value;
 815                         break;
 816                 case DEV_PROP_U32:
 817                         if (obj->integer.value > U32_MAX)
 818                                 return -EOVERFLOW;
 819                         *(u32 *)val = obj->integer.value;
 820                         break;
 821                 default:
 822                         *(u64 *)val = obj->integer.value;
 823                         break;
 824                 }
 825         } else if (proptype == DEV_PROP_STRING) {
 826                 ret = acpi_data_get_property(data, propname, ACPI_TYPE_STRING, &obj);
 827                 if (ret)
 828                         return ret;
 829 
 830                 *(char **)val = obj->string.pointer;
 831 
 832                 return 1;
 833         } else {
 834                 ret = -EINVAL;
 835         }
 836         return ret;
 837 }
 838 
 839 int acpi_dev_prop_read_single(struct acpi_device *adev, const char *propname,
 840                               enum dev_prop_type proptype, void *val)
 841 {
 842         int ret;
 843 
 844         if (!adev)
 845                 return -EINVAL;
 846 
 847         ret = acpi_data_prop_read_single(&adev->data, propname, proptype, val);
 848         if (ret < 0 || proptype != ACPI_TYPE_STRING)
 849                 return ret;
 850         return 0;
 851 }
 852 
 853 static int acpi_copy_property_array_u8(const union acpi_object *items, u8 *val,
 854                                        size_t nval)
 855 {
 856         int i;
 857 
 858         for (i = 0; i < nval; i++) {
 859                 if (items[i].type != ACPI_TYPE_INTEGER)
 860                         return -EPROTO;
 861                 if (items[i].integer.value > U8_MAX)
 862                         return -EOVERFLOW;
 863 
 864                 val[i] = items[i].integer.value;
 865         }
 866         return 0;
 867 }
 868 
 869 static int acpi_copy_property_array_u16(const union acpi_object *items,
 870                                         u16 *val, size_t nval)
 871 {
 872         int i;
 873 
 874         for (i = 0; i < nval; i++) {
 875                 if (items[i].type != ACPI_TYPE_INTEGER)
 876                         return -EPROTO;
 877                 if (items[i].integer.value > U16_MAX)
 878                         return -EOVERFLOW;
 879 
 880                 val[i] = items[i].integer.value;
 881         }
 882         return 0;
 883 }
 884 
 885 static int acpi_copy_property_array_u32(const union acpi_object *items,
 886                                         u32 *val, size_t nval)
 887 {
 888         int i;
 889 
 890         for (i = 0; i < nval; i++) {
 891                 if (items[i].type != ACPI_TYPE_INTEGER)
 892                         return -EPROTO;
 893                 if (items[i].integer.value > U32_MAX)
 894                         return -EOVERFLOW;
 895 
 896                 val[i] = items[i].integer.value;
 897         }
 898         return 0;
 899 }
 900 
 901 static int acpi_copy_property_array_u64(const union acpi_object *items,
 902                                         u64 *val, size_t nval)
 903 {
 904         int i;
 905 
 906         for (i = 0; i < nval; i++) {
 907                 if (items[i].type != ACPI_TYPE_INTEGER)
 908                         return -EPROTO;
 909 
 910                 val[i] = items[i].integer.value;
 911         }
 912         return 0;
 913 }
 914 
 915 static int acpi_copy_property_array_string(const union acpi_object *items,
 916                                            char **val, size_t nval)
 917 {
 918         int i;
 919 
 920         for (i = 0; i < nval; i++) {
 921                 if (items[i].type != ACPI_TYPE_STRING)
 922                         return -EPROTO;
 923 
 924                 val[i] = items[i].string.pointer;
 925         }
 926         return nval;
 927 }
 928 
 929 static int acpi_data_prop_read(const struct acpi_device_data *data,
 930                                const char *propname,
 931                                enum dev_prop_type proptype,
 932                                void *val, size_t nval)
 933 {
 934         const union acpi_object *obj;
 935         const union acpi_object *items;
 936         int ret;
 937 
 938         if (val && nval == 1) {
 939                 ret = acpi_data_prop_read_single(data, propname, proptype, val);
 940                 if (ret >= 0)
 941                         return ret;
 942         }
 943 
 944         ret = acpi_data_get_property_array(data, propname, ACPI_TYPE_ANY, &obj);
 945         if (ret)
 946                 return ret;
 947 
 948         if (!val)
 949                 return obj->package.count;
 950 
 951         if (proptype != DEV_PROP_STRING && nval > obj->package.count)
 952                 return -EOVERFLOW;
 953         else if (nval <= 0)
 954                 return -EINVAL;
 955 
 956         items = obj->package.elements;
 957 
 958         switch (proptype) {
 959         case DEV_PROP_U8:
 960                 ret = acpi_copy_property_array_u8(items, (u8 *)val, nval);
 961                 break;
 962         case DEV_PROP_U16:
 963                 ret = acpi_copy_property_array_u16(items, (u16 *)val, nval);
 964                 break;
 965         case DEV_PROP_U32:
 966                 ret = acpi_copy_property_array_u32(items, (u32 *)val, nval);
 967                 break;
 968         case DEV_PROP_U64:
 969                 ret = acpi_copy_property_array_u64(items, (u64 *)val, nval);
 970                 break;
 971         case DEV_PROP_STRING:
 972                 ret = acpi_copy_property_array_string(
 973                         items, (char **)val,
 974                         min_t(u32, nval, obj->package.count));
 975                 break;
 976         default:
 977                 ret = -EINVAL;
 978                 break;
 979         }
 980         return ret;
 981 }
 982 
 983 int acpi_dev_prop_read(const struct acpi_device *adev, const char *propname,
 984                        enum dev_prop_type proptype, void *val, size_t nval)
 985 {
 986         return adev ? acpi_data_prop_read(&adev->data, propname, proptype, val, nval) : -EINVAL;
 987 }
 988 
 989 /**
 990  * acpi_node_prop_read - retrieve the value of an ACPI property with given name.
 991  * @fwnode: Firmware node to get the property from.
 992  * @propname: Name of the property.
 993  * @proptype: Expected property type.
 994  * @val: Location to store the property value (if not %NULL).
 995  * @nval: Size of the array pointed to by @val.
 996  *
 997  * If @val is %NULL, return the number of array elements comprising the value
 998  * of the property.  Otherwise, read at most @nval values to the array at the
 999  * location pointed to by @val.
1000  */
1001 int acpi_node_prop_read(const struct fwnode_handle *fwnode,
1002                         const char *propname, enum dev_prop_type proptype,
1003                         void *val, size_t nval)
1004 {
1005         return acpi_data_prop_read(acpi_device_data_of_node(fwnode),
1006                                    propname, proptype, val, nval);
1007 }
1008 
1009 /**
1010  * acpi_get_next_subnode - Return the next child node handle for a fwnode
1011  * @fwnode: Firmware node to find the next child node for.
1012  * @child: Handle to one of the device's child nodes or a null handle.
1013  */
1014 struct fwnode_handle *acpi_get_next_subnode(const struct fwnode_handle *fwnode,
1015                                             struct fwnode_handle *child)
1016 {
1017         const struct acpi_device *adev = to_acpi_device_node(fwnode);
1018         const struct list_head *head;
1019         struct list_head *next;
1020 
1021         if (!child || is_acpi_device_node(child)) {
1022                 struct acpi_device *child_adev;
1023 
1024                 if (adev)
1025                         head = &adev->children;
1026                 else
1027                         goto nondev;
1028 
1029                 if (list_empty(head))
1030                         goto nondev;
1031 
1032                 if (child) {
1033                         adev = to_acpi_device_node(child);
1034                         next = adev->node.next;
1035                         if (next == head) {
1036                                 child = NULL;
1037                                 goto nondev;
1038                         }
1039                         child_adev = list_entry(next, struct acpi_device, node);
1040                 } else {
1041                         child_adev = list_first_entry(head, struct acpi_device,
1042                                                       node);
1043                 }
1044                 return acpi_fwnode_handle(child_adev);
1045         }
1046 
1047  nondev:
1048         if (!child || is_acpi_data_node(child)) {
1049                 const struct acpi_data_node *data = to_acpi_data_node(fwnode);
1050                 struct acpi_data_node *dn;
1051 
1052                 /*
1053                  * We can have a combination of device and data nodes, e.g. with
1054                  * hierarchical _DSD properties. Make sure the adev pointer is
1055                  * restored before going through data nodes, otherwise we will
1056                  * be looking for data_nodes below the last device found instead
1057                  * of the common fwnode shared by device_nodes and data_nodes.
1058                  */
1059                 adev = to_acpi_device_node(fwnode);
1060                 if (adev)
1061                         head = &adev->data.subnodes;
1062                 else if (data)
1063                         head = &data->data.subnodes;
1064                 else
1065                         return NULL;
1066 
1067                 if (list_empty(head))
1068                         return NULL;
1069 
1070                 if (child) {
1071                         dn = to_acpi_data_node(child);
1072                         next = dn->sibling.next;
1073                         if (next == head)
1074                                 return NULL;
1075 
1076                         dn = list_entry(next, struct acpi_data_node, sibling);
1077                 } else {
1078                         dn = list_first_entry(head, struct acpi_data_node, sibling);
1079                 }
1080                 return &dn->fwnode;
1081         }
1082         return NULL;
1083 }
1084 
1085 /**
1086  * acpi_node_get_parent - Return parent fwnode of this fwnode
1087  * @fwnode: Firmware node whose parent to get
1088  *
1089  * Returns parent node of an ACPI device or data firmware node or %NULL if
1090  * not available.
1091  */
1092 struct fwnode_handle *acpi_node_get_parent(const struct fwnode_handle *fwnode)
1093 {
1094         if (is_acpi_data_node(fwnode)) {
1095                 /* All data nodes have parent pointer so just return that */
1096                 return to_acpi_data_node(fwnode)->parent;
1097         } else if (is_acpi_device_node(fwnode)) {
1098                 acpi_handle handle, parent_handle;
1099 
1100                 handle = to_acpi_device_node(fwnode)->handle;
1101                 if (ACPI_SUCCESS(acpi_get_parent(handle, &parent_handle))) {
1102                         struct acpi_device *adev;
1103 
1104                         if (!acpi_bus_get_device(parent_handle, &adev))
1105                                 return acpi_fwnode_handle(adev);
1106                 }
1107         }
1108 
1109         return NULL;
1110 }
1111 
1112 /*
1113  * Return true if the node is an ACPI graph node. Called on either ports
1114  * or endpoints.
1115  */
1116 static bool is_acpi_graph_node(struct fwnode_handle *fwnode,
1117                                const char *str)
1118 {
1119         unsigned int len = strlen(str);
1120         const char *name;
1121 
1122         if (!len || !is_acpi_data_node(fwnode))
1123                 return false;
1124 
1125         name = to_acpi_data_node(fwnode)->name;
1126 
1127         return (fwnode_property_present(fwnode, "reg") &&
1128                 !strncmp(name, str, len) && name[len] == '@') ||
1129                 fwnode_property_present(fwnode, str);
1130 }
1131 
1132 /**
1133  * acpi_graph_get_next_endpoint - Get next endpoint ACPI firmware node
1134  * @fwnode: Pointer to the parent firmware node
1135  * @prev: Previous endpoint node or %NULL to get the first
1136  *
1137  * Looks up next endpoint ACPI firmware node below a given @fwnode. Returns
1138  * %NULL if there is no next endpoint or in case of error. In case of success
1139  * the next endpoint is returned.
1140  */
1141 static struct fwnode_handle *acpi_graph_get_next_endpoint(
1142         const struct fwnode_handle *fwnode, struct fwnode_handle *prev)
1143 {
1144         struct fwnode_handle *port = NULL;
1145         struct fwnode_handle *endpoint;
1146 
1147         if (!prev) {
1148                 do {
1149                         port = fwnode_get_next_child_node(fwnode, port);
1150                         /*
1151                          * The names of the port nodes begin with "port@"
1152                          * followed by the number of the port node and they also
1153                          * have a "reg" property that also has the number of the
1154                          * port node. For compatibility reasons a node is also
1155                          * recognised as a port node from the "port" property.
1156                          */
1157                         if (is_acpi_graph_node(port, "port"))
1158                                 break;
1159                 } while (port);
1160         } else {
1161                 port = fwnode_get_parent(prev);
1162         }
1163 
1164         if (!port)
1165                 return NULL;
1166 
1167         endpoint = fwnode_get_next_child_node(port, prev);
1168         while (!endpoint) {
1169                 port = fwnode_get_next_child_node(fwnode, port);
1170                 if (!port)
1171                         break;
1172                 if (is_acpi_graph_node(port, "port"))
1173                         endpoint = fwnode_get_next_child_node(port, NULL);
1174         }
1175 
1176         /*
1177          * The names of the endpoint nodes begin with "endpoint@" followed by
1178          * the number of the endpoint node and they also have a "reg" property
1179          * that also has the number of the endpoint node. For compatibility
1180          * reasons a node is also recognised as an endpoint node from the
1181          * "endpoint" property.
1182          */
1183         if (!is_acpi_graph_node(endpoint, "endpoint"))
1184                 return NULL;
1185 
1186         return endpoint;
1187 }
1188 
1189 /**
1190  * acpi_graph_get_child_prop_value - Return a child with a given property value
1191  * @fwnode: device fwnode
1192  * @prop_name: The name of the property to look for
1193  * @val: the desired property value
1194  *
1195  * Return the port node corresponding to a given port number. Returns
1196  * the child node on success, NULL otherwise.
1197  */
1198 static struct fwnode_handle *acpi_graph_get_child_prop_value(
1199         const struct fwnode_handle *fwnode, const char *prop_name,
1200         unsigned int val)
1201 {
1202         struct fwnode_handle *child;
1203 
1204         fwnode_for_each_child_node(fwnode, child) {
1205                 u32 nr;
1206 
1207                 if (fwnode_property_read_u32(child, prop_name, &nr))
1208                         continue;
1209 
1210                 if (val == nr)
1211                         return child;
1212         }
1213 
1214         return NULL;
1215 }
1216 
1217 
1218 /**
1219  * acpi_graph_get_remote_endpoint - Parses and returns remote end of an endpoint
1220  * @fwnode: Endpoint firmware node pointing to a remote device
1221  * @endpoint: Firmware node of remote endpoint is filled here if not %NULL
1222  *
1223  * Returns the remote endpoint corresponding to @__fwnode. NULL on error.
1224  */
1225 static struct fwnode_handle *
1226 acpi_graph_get_remote_endpoint(const struct fwnode_handle *__fwnode)
1227 {
1228         struct fwnode_handle *fwnode;
1229         unsigned int port_nr, endpoint_nr;
1230         struct fwnode_reference_args args;
1231         int ret;
1232 
1233         memset(&args, 0, sizeof(args));
1234         ret = acpi_node_get_property_reference(__fwnode, "remote-endpoint", 0,
1235                                                &args);
1236         if (ret)
1237                 return NULL;
1238 
1239         /* Direct endpoint reference? */
1240         if (!is_acpi_device_node(args.fwnode))
1241                 return args.nargs ? NULL : args.fwnode;
1242 
1243         /*
1244          * Always require two arguments with the reference: port and
1245          * endpoint indices.
1246          */
1247         if (args.nargs != 2)
1248                 return NULL;
1249 
1250         fwnode = args.fwnode;
1251         port_nr = args.args[0];
1252         endpoint_nr = args.args[1];
1253 
1254         fwnode = acpi_graph_get_child_prop_value(fwnode, "port", port_nr);
1255 
1256         return acpi_graph_get_child_prop_value(fwnode, "endpoint", endpoint_nr);
1257 }
1258 
1259 static bool acpi_fwnode_device_is_available(const struct fwnode_handle *fwnode)
1260 {
1261         if (!is_acpi_device_node(fwnode))
1262                 return false;
1263 
1264         return acpi_device_is_present(to_acpi_device_node(fwnode));
1265 }
1266 
1267 static bool acpi_fwnode_property_present(const struct fwnode_handle *fwnode,
1268                                          const char *propname)
1269 {
1270         return !acpi_node_prop_get(fwnode, propname, NULL);
1271 }
1272 
1273 static int
1274 acpi_fwnode_property_read_int_array(const struct fwnode_handle *fwnode,
1275                                     const char *propname,
1276                                     unsigned int elem_size, void *val,
1277                                     size_t nval)
1278 {
1279         enum dev_prop_type type;
1280 
1281         switch (elem_size) {
1282         case sizeof(u8):
1283                 type = DEV_PROP_U8;
1284                 break;
1285         case sizeof(u16):
1286                 type = DEV_PROP_U16;
1287                 break;
1288         case sizeof(u32):
1289                 type = DEV_PROP_U32;
1290                 break;
1291         case sizeof(u64):
1292                 type = DEV_PROP_U64;
1293                 break;
1294         default:
1295                 return -ENXIO;
1296         }
1297 
1298         return acpi_node_prop_read(fwnode, propname, type, val, nval);
1299 }
1300 
1301 static int
1302 acpi_fwnode_property_read_string_array(const struct fwnode_handle *fwnode,
1303                                        const char *propname, const char **val,
1304                                        size_t nval)
1305 {
1306         return acpi_node_prop_read(fwnode, propname, DEV_PROP_STRING,
1307                                    val, nval);
1308 }
1309 
1310 static int
1311 acpi_fwnode_get_reference_args(const struct fwnode_handle *fwnode,
1312                                const char *prop, const char *nargs_prop,
1313                                unsigned int args_count, unsigned int index,
1314                                struct fwnode_reference_args *args)
1315 {
1316         return __acpi_node_get_property_reference(fwnode, prop, index,
1317                                                   args_count, args);
1318 }
1319 
1320 static struct fwnode_handle *
1321 acpi_fwnode_get_parent(struct fwnode_handle *fwnode)
1322 {
1323         return acpi_node_get_parent(fwnode);
1324 }
1325 
1326 static int acpi_fwnode_graph_parse_endpoint(const struct fwnode_handle *fwnode,
1327                                             struct fwnode_endpoint *endpoint)
1328 {
1329         struct fwnode_handle *port_fwnode = fwnode_get_parent(fwnode);
1330 
1331         endpoint->local_fwnode = fwnode;
1332 
1333         if (fwnode_property_read_u32(port_fwnode, "reg", &endpoint->port))
1334                 fwnode_property_read_u32(port_fwnode, "port", &endpoint->port);
1335         if (fwnode_property_read_u32(fwnode, "reg", &endpoint->id))
1336                 fwnode_property_read_u32(fwnode, "endpoint", &endpoint->id);
1337 
1338         return 0;
1339 }
1340 
1341 static const void *
1342 acpi_fwnode_device_get_match_data(const struct fwnode_handle *fwnode,
1343                                   const struct device *dev)
1344 {
1345         return acpi_device_get_match_data(dev);
1346 }
1347 
1348 #define DECLARE_ACPI_FWNODE_OPS(ops) \
1349         const struct fwnode_operations ops = {                          \
1350                 .device_is_available = acpi_fwnode_device_is_available, \
1351                 .device_get_match_data = acpi_fwnode_device_get_match_data, \
1352                 .property_present = acpi_fwnode_property_present,       \
1353                 .property_read_int_array =                              \
1354                         acpi_fwnode_property_read_int_array,            \
1355                 .property_read_string_array =                           \
1356                         acpi_fwnode_property_read_string_array,         \
1357                 .get_parent = acpi_node_get_parent,                     \
1358                 .get_next_child_node = acpi_get_next_subnode,           \
1359                 .get_named_child_node = acpi_fwnode_get_named_child_node, \
1360                 .get_reference_args = acpi_fwnode_get_reference_args,   \
1361                 .graph_get_next_endpoint =                              \
1362                         acpi_graph_get_next_endpoint,                   \
1363                 .graph_get_remote_endpoint =                            \
1364                         acpi_graph_get_remote_endpoint,                 \
1365                 .graph_get_port_parent = acpi_fwnode_get_parent,        \
1366                 .graph_parse_endpoint = acpi_fwnode_graph_parse_endpoint, \
1367         };                                                              \
1368         EXPORT_SYMBOL_GPL(ops)
1369 
1370 DECLARE_ACPI_FWNODE_OPS(acpi_device_fwnode_ops);
1371 DECLARE_ACPI_FWNODE_OPS(acpi_data_fwnode_ops);
1372 const struct fwnode_operations acpi_static_fwnode_ops;
1373 
1374 bool is_acpi_device_node(const struct fwnode_handle *fwnode)
1375 {
1376         return !IS_ERR_OR_NULL(fwnode) &&
1377                 fwnode->ops == &acpi_device_fwnode_ops;
1378 }
1379 EXPORT_SYMBOL(is_acpi_device_node);
1380 
1381 bool is_acpi_data_node(const struct fwnode_handle *fwnode)
1382 {
1383         return !IS_ERR_OR_NULL(fwnode) && fwnode->ops == &acpi_data_fwnode_ops;
1384 }
1385 EXPORT_SYMBOL(is_acpi_data_node);
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root/drivers/acpi/property.c

DEFINITIONS
