drivers/acpi/acpica/nsxfname.c

   1 /******************************************************************************
   2  *
   3  * Module Name: nsxfname - Public interfaces to the ACPI subsystem
   4  *                         ACPI Namespace oriented interfaces
   5  *
   6  *****************************************************************************/
   7
   8 /*
   9  * Copyright (C) 2000 - 2012, Intel Corp.
  10  * All rights reserved.
  11  *
  12  * Redistribution and use in source and binary forms, with or without
  13  * modification, are permitted provided that the following conditions
  14  * are met:
  15  * 1. Redistributions of source code must retain the above copyright
  16  *    notice, this list of conditions, and the following disclaimer,
  17  *    without modification.
  18  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  19  *    substantially similar to the "NO WARRANTY" disclaimer below
  20  *    ("Disclaimer") and any redistribution must be conditioned upon
  21  *    including a substantially similar Disclaimer requirement for further
  22  *    binary redistribution.
  23  * 3. Neither the names of the above-listed copyright holders nor the names
  24  *    of any contributors may be used to endorse or promote products derived
  25  *    from this software without specific prior written permission.
  26  *
  27  * Alternatively, this software may be distributed under the terms of the
  28  * GNU General Public License ("GPL") version 2 as published by the Free
  29  * Software Foundation.
  30  *
  31  * NO WARRANTY
  32  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  33  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  34  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  35  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  36  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  37  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  38  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  39  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  40  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  41  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  42  * POSSIBILITY OF SUCH DAMAGES.
  43  */
  44
  45 #include <linux/export.h>
  46 #include <acpi/acpi.h>
  47 #include "accommon.h"
  48 #include "acnamesp.h"
  49 #include "acparser.h"
  50 #include "amlcode.h"
  51
  52 #define _COMPONENT          ACPI_NAMESPACE
  53 ACPI_MODULE_NAME("nsxfname")
  54
  55 /* Local prototypes */
  56 static char *acpi_ns_copy_device_id(struct acpi_pnp_device_id *dest,
  57                                     struct acpi_pnp_device_id *source,
  58                                     char *string_area);
  59
  60 /******************************************************************************
  61  *
  62  * FUNCTION:    acpi_get_handle
  63  *
  64  * PARAMETERS:  parent          - Object to search under (search scope).
  65  *              pathname        - Pointer to an asciiz string containing the
  66  *                                name
  67  *              ret_handle      - Where the return handle is returned
  68  *
  69  * RETURN:      Status
  70  *
  71  * DESCRIPTION: This routine will search for a caller specified name in the
  72  *              name space. The caller can restrict the search region by
  73  *              specifying a non NULL parent. The parent value is itself a
  74  *              namespace handle.
  75  *
  76  ******************************************************************************/
  77
  78 acpi_status
  79 acpi_get_handle(acpi_handle parent,
  80                 acpi_string pathname, acpi_handle * ret_handle)
  81 {
  82         acpi_status status;
  83         struct acpi_namespace_node *node = NULL;
  84         struct acpi_namespace_node *prefix_node = NULL;
  85
  86         ACPI_FUNCTION_ENTRY();
  87
  88         /* Parameter Validation */
  89
  90         if (!ret_handle || !pathname) {
  91                 return (AE_BAD_PARAMETER);
  92         }
  93
  94         /* Convert a parent handle to a prefix node */
  95
  96         if (parent) {
  97                 prefix_node = acpi_ns_validate_handle(parent);
  98                 if (!prefix_node) {
  99                         return (AE_BAD_PARAMETER);
 100                 }
 101         }
 102
 103         /*
 104          * Valid cases are:
 105          * 1) Fully qualified pathname
 106          * 2) Parent + Relative pathname
 107          *
 108          * Error for <null Parent + relative path>
 109          */
 110         if (acpi_ns_valid_root_prefix(pathname[0])) {
 111
 112                 /* Pathname is fully qualified (starts with '\') */
 113
 114                 /* Special case for root-only, since we can't search for it */
 115
 116                 if (!ACPI_STRCMP(pathname, ACPI_NS_ROOT_PATH)) {
 117                         *ret_handle =
 118                             ACPI_CAST_PTR(acpi_handle, acpi_gbl_root_node);
 119                         return (AE_OK);
 120                 }
 121         } else if (!prefix_node) {
 122
 123                 /* Relative path with null prefix is disallowed */
 124
 125                 return (AE_BAD_PARAMETER);
 126         }
 127
 128         /* Find the Node and convert to a handle */
 129
 130         status =
 131             acpi_ns_get_node(prefix_node, pathname, ACPI_NS_NO_UPSEARCH, &node);
 132         if (ACPI_SUCCESS(status)) {
 133                 *ret_handle = ACPI_CAST_PTR(acpi_handle, node);
 134         }
 135
 136         return (status);
 137 }
 138
 139 ACPI_EXPORT_SYMBOL(acpi_get_handle)
 140
 141 /******************************************************************************
 142  *
 143  * FUNCTION:    acpi_get_name
 144  *
 145  * PARAMETERS:  handle          - Handle to be converted to a pathname
 146  *              name_type       - Full pathname or single segment
 147  *              buffer          - Buffer for returned path
 148  *
 149  * RETURN:      Pointer to a string containing the fully qualified Name.
 150  *
 151  * DESCRIPTION: This routine returns the fully qualified name associated with
 152  *              the Handle parameter. This and the acpi_pathname_to_handle are
 153  *              complementary functions.
 154  *
 155  ******************************************************************************/
 156 acpi_status
 157 acpi_get_name(acpi_handle handle, u32 name_type, struct acpi_buffer * buffer)
 158 {
 159         acpi_status status;
 160         struct acpi_namespace_node *node;
 161
 162         /* Parameter validation */
 163
 164         if (name_type > ACPI_NAME_TYPE_MAX) {
 165                 return (AE_BAD_PARAMETER);
 166         }
 167
 168         status = acpi_ut_validate_buffer(buffer);
 169         if (ACPI_FAILURE(status)) {
 170                 return (status);
 171         }
 172
 173         if (name_type == ACPI_FULL_PATHNAME) {
 174
 175                 /* Get the full pathname (From the namespace root) */
 176
 177                 status = acpi_ns_handle_to_pathname(handle, buffer);
 178                 return (status);
 179         }
 180
 181         /*
 182          * Wants the single segment ACPI name.
 183          * Validate handle and convert to a namespace Node
 184          */
 185         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
 186         if (ACPI_FAILURE(status)) {
 187                 return (status);
 188         }
 189
 190         node = acpi_ns_validate_handle(handle);
 191         if (!node) {
 192                 status = AE_BAD_PARAMETER;
 193                 goto unlock_and_exit;
 194         }
 195
 196         /* Validate/Allocate/Clear caller buffer */
 197
 198         status = acpi_ut_initialize_buffer(buffer, ACPI_PATH_SEGMENT_LENGTH);
 199         if (ACPI_FAILURE(status)) {
 200                 goto unlock_and_exit;
 201         }
 202
 203         /* Just copy the ACPI name from the Node and zero terminate it */
 204
 205         ACPI_MOVE_NAME(buffer->pointer, acpi_ut_get_node_name(node));
 206         ((char *)buffer->pointer)[ACPI_NAME_SIZE] = 0;
 207         status = AE_OK;
 208
 209       unlock_and_exit:
 210
 211         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 212         return (status);
 213 }
 214
 215 ACPI_EXPORT_SYMBOL(acpi_get_name)
 216
 217 /******************************************************************************
 218  *
 219  * FUNCTION:    acpi_ns_copy_device_id
 220  *
 221  * PARAMETERS:  dest                - Pointer to the destination PNP_DEVICE_ID
 222  *              source              - Pointer to the source PNP_DEVICE_ID
 223  *              string_area         - Pointer to where to copy the dest string
 224  *
 225  * RETURN:      Pointer to the next string area
 226  *
 227  * DESCRIPTION: Copy a single PNP_DEVICE_ID, including the string data.
 228  *
 229  ******************************************************************************/
 230 static char *acpi_ns_copy_device_id(struct acpi_pnp_device_id *dest,
 231                                     struct acpi_pnp_device_id *source,
 232                                     char *string_area)
 233 {
 234
 235         /* Create the destination PNP_DEVICE_ID */
 236
 237         dest->string = string_area;
 238         dest->length = source->length;
 239
 240         /* Copy actual string and return a pointer to the next string area */
 241
 242         ACPI_MEMCPY(string_area, source->string, source->length);
 243         return (string_area + source->length);
 244 }
 245
 246 /******************************************************************************
 247  *
 248  * FUNCTION:    acpi_get_object_info
 249  *
 250  * PARAMETERS:  handle              - Object Handle
 251  *              return_buffer       - Where the info is returned
 252  *
 253  * RETURN:      Status
 254  *
 255  * DESCRIPTION: Returns information about an object as gleaned from the
 256  *              namespace node and possibly by running several standard
 257  *              control methods (Such as in the case of a device.)
 258  *
 259  * For Device and Processor objects, run the Device _HID, _UID, _CID, _SUB,
 260  * _STA, _ADR, _sx_w, and _sx_d methods.
 261  *
 262  * Note: Allocates the return buffer, must be freed by the caller.
 263  *
 264  ******************************************************************************/
 265
 266 acpi_status
 267 acpi_get_object_info(acpi_handle handle,
 268                      struct acpi_device_info **return_buffer)
 269 {
 270         struct acpi_namespace_node *node;
 271         struct acpi_device_info *info;
 272         struct acpi_pnp_device_id_list *cid_list = NULL;
 273         struct acpi_pnp_device_id *hid = NULL;
 274         struct acpi_pnp_device_id *uid = NULL;
 275         struct acpi_pnp_device_id *sub = NULL;
 276         char *next_id_string;
 277         acpi_object_type type;
 278         acpi_name name;
 279         u8 param_count = 0;
 280         u8 valid = 0;
 281         u32 info_size;
 282         u32 i;
 283         acpi_status status;
 284
 285         /* Parameter validation */
 286
 287         if (!handle || !return_buffer) {
 288                 return (AE_BAD_PARAMETER);
 289         }
 290
 291         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
 292         if (ACPI_FAILURE(status)) {
 293                 goto cleanup;
 294         }
 295
 296         node = acpi_ns_validate_handle(handle);
 297         if (!node) {
 298                 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 299                 return (AE_BAD_PARAMETER);
 300         }
 301
 302         /* Get the namespace node data while the namespace is locked */
 303
 304         info_size = sizeof(struct acpi_device_info);
 305         type = node->type;
 306         name = node->name.integer;
 307
 308         if (node->type == ACPI_TYPE_METHOD) {
 309                 param_count = node->object->method.param_count;
 310         }
 311
 312         status = acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 313         if (ACPI_FAILURE(status)) {
 314                 return (status);
 315         }
 316
 317         if ((type == ACPI_TYPE_DEVICE) || (type == ACPI_TYPE_PROCESSOR)) {
 318                 /*
 319                  * Get extra info for ACPI Device/Processor objects only:
 320                  * Run the Device _HID, _UID, _SUB, and _CID methods.
 321                  *
 322                  * Note: none of these methods are required, so they may or may
 323                  * not be present for this device. The Info->Valid bitfield is used
 324                  * to indicate which methods were found and run successfully.
 325                  */
 326
 327                 /* Execute the Device._HID method */
 328
 329                 status = acpi_ut_execute_HID(node, &hid);
 330                 if (ACPI_SUCCESS(status)) {
 331                         info_size += hid->length;
 332                         valid |= ACPI_VALID_HID;
 333                 }
 334
 335                 /* Execute the Device._UID method */
 336
 337                 status = acpi_ut_execute_UID(node, &uid);
 338                 if (ACPI_SUCCESS(status)) {
 339                         info_size += uid->length;
 340                         valid |= ACPI_VALID_UID;
 341                 }
 342
 343                 /* Execute the Device._SUB method */
 344
 345                 status = acpi_ut_execute_SUB(node, &sub);
 346                 if (ACPI_SUCCESS(status)) {
 347                         info_size += sub->length;
 348                         valid |= ACPI_VALID_SUB;
 349                 }
 350
 351                 /* Execute the Device._CID method */
 352
 353                 status = acpi_ut_execute_CID(node, &cid_list);
 354                 if (ACPI_SUCCESS(status)) {
 355
 356                         /* Add size of CID strings and CID pointer array */
 357
 358                         info_size +=
 359                             (cid_list->list_size -
 360                              sizeof(struct acpi_pnp_device_id_list));
 361                         valid |= ACPI_VALID_CID;
 362                 }
 363         }
 364
 365         /*
 366          * Now that we have the variable-length data, we can allocate the
 367          * return buffer
 368          */
 369         info = ACPI_ALLOCATE_ZEROED(info_size);
 370         if (!info) {
 371                 status = AE_NO_MEMORY;
 372                 goto cleanup;
 373         }
 374
 375         /* Get the fixed-length data */
 376
 377         if ((type == ACPI_TYPE_DEVICE) || (type == ACPI_TYPE_PROCESSOR)) {
 378                 /*
 379                  * Get extra info for ACPI Device/Processor objects only:
 380                  * Run the _STA, _ADR and, sx_w, and _sx_d methods.
 381                  *
 382                  * Note: none of these methods are required, so they may or may
 383                  * not be present for this device. The Info->Valid bitfield is used
 384                  * to indicate which methods were found and run successfully.
 385                  */
 386
 387                 /* Execute the Device._STA method */
 388
 389                 status = acpi_ut_execute_STA(node, &info->current_status);
 390                 if (ACPI_SUCCESS(status)) {
 391                         valid |= ACPI_VALID_STA;
 392                 }
 393
 394                 /* Execute the Device._ADR method */
 395
 396                 status = acpi_ut_evaluate_numeric_object(METHOD_NAME__ADR, node,
 397                                                          &info->address);
 398                 if (ACPI_SUCCESS(status)) {
 399                         valid |= ACPI_VALID_ADR;
 400                 }
 401
 402                 /* Execute the Device._sx_w methods */
 403
 404                 status = acpi_ut_execute_power_methods(node,
 405                                                        acpi_gbl_lowest_dstate_names,
 406                                                        ACPI_NUM_sx_w_METHODS,
 407                                                        info->lowest_dstates);
 408                 if (ACPI_SUCCESS(status)) {
 409                         valid |= ACPI_VALID_SXWS;
 410                 }
 411
 412                 /* Execute the Device._sx_d methods */
 413
 414                 status = acpi_ut_execute_power_methods(node,
 415                                                        acpi_gbl_highest_dstate_names,
 416                                                        ACPI_NUM_sx_d_METHODS,
 417                                                        info->highest_dstates);
 418                 if (ACPI_SUCCESS(status)) {
 419                         valid |= ACPI_VALID_SXDS;
 420                 }
 421         }
 422
 423         /*
 424          * Create a pointer to the string area of the return buffer.
 425          * Point to the end of the base struct acpi_device_info structure.
 426          */
 427         next_id_string = ACPI_CAST_PTR(char, info->compatible_id_list.ids);
 428         if (cid_list) {
 429
 430                 /* Point past the CID PNP_DEVICE_ID array */
 431
 432                 next_id_string +=
 433                     ((acpi_size) cid_list->count *
 434                      sizeof(struct acpi_pnp_device_id));
 435         }
 436
 437         /*
 438          * Copy the HID, UID, SUB, and CIDs to the return buffer.
 439          * The variable-length strings are copied to the reserved area
 440          * at the end of the buffer.
 441          *
 442          * For HID and CID, check if the ID is a PCI Root Bridge.
 443          */
 444         if (hid) {
 445                 next_id_string = acpi_ns_copy_device_id(&info->hardware_id,
 446                                                         hid, next_id_string);
 447
 448                 if (acpi_ut_is_pci_root_bridge(hid->string)) {
 449                         info->flags |= ACPI_PCI_ROOT_BRIDGE;
 450                 }
 451         }
 452
 453         if (uid) {
 454                 next_id_string = acpi_ns_copy_device_id(&info->unique_id,
 455                                                         uid, next_id_string);
 456         }
 457
 458         if (sub) {
 459                 next_id_string = acpi_ns_copy_device_id(&info->subsystem_id,
 460                                                         sub, next_id_string);
 461         }
 462
 463         if (cid_list) {
 464                 info->compatible_id_list.count = cid_list->count;
 465                 info->compatible_id_list.list_size = cid_list->list_size;
 466
 467                 /* Copy each CID */
 468
 469                 for (i = 0; i < cid_list->count; i++) {
 470                         next_id_string =
 471                             acpi_ns_copy_device_id(&info->compatible_id_list.
 472                                                    ids[i], &cid_list->ids[i],
 473                                                    next_id_string);
 474
 475                         if (acpi_ut_is_pci_root_bridge(cid_list->ids[i].string)) {
 476                                 info->flags |= ACPI_PCI_ROOT_BRIDGE;
 477                         }
 478                 }
 479         }
 480
 481         /* Copy the fixed-length data */
 482
 483         info->info_size = info_size;
 484         info->type = type;
 485         info->name = name;
 486         info->param_count = param_count;
 487         info->valid = valid;
 488
 489         *return_buffer = info;
 490         status = AE_OK;
 491
 492       cleanup:
 493         if (hid) {
 494                 ACPI_FREE(hid);
 495         }
 496         if (uid) {
 497                 ACPI_FREE(uid);
 498         }
 499         if (sub) {
 500                 ACPI_FREE(sub);
 501         }
 502         if (cid_list) {
 503                 ACPI_FREE(cid_list);
 504         }
 505         return (status);
 506 }
 507
 508 ACPI_EXPORT_SYMBOL(acpi_get_object_info)
 509
 510 /******************************************************************************
 511  *
 512  * FUNCTION:    acpi_install_method
 513  *
 514  * PARAMETERS:  buffer         - An ACPI table containing one control method
 515  *
 516  * RETURN:      Status
 517  *
 518  * DESCRIPTION: Install a control method into the namespace. If the method
 519  *              name already exists in the namespace, it is overwritten. The
 520  *              input buffer must contain a valid DSDT or SSDT containing a
 521  *              single control method.
 522  *
 523  ******************************************************************************/
 524 acpi_status acpi_install_method(u8 *buffer)
 525 {
 526         struct acpi_table_header *table =
 527             ACPI_CAST_PTR(struct acpi_table_header, buffer);
 528         u8 *aml_buffer;
 529         u8 *aml_start;
 530         char *path;
 531         struct acpi_namespace_node *node;
 532         union acpi_operand_object *method_obj;
 533         struct acpi_parse_state parser_state;
 534         u32 aml_length;
 535         u16 opcode;
 536         u8 method_flags;
 537         acpi_status status;
 538
 539         /* Parameter validation */
 540
 541         if (!buffer) {
 542                 return AE_BAD_PARAMETER;
 543         }
 544
 545         /* Table must be a DSDT or SSDT */
 546
 547         if (!ACPI_COMPARE_NAME(table->signature, ACPI_SIG_DSDT) &&
 548             !ACPI_COMPARE_NAME(table->signature, ACPI_SIG_SSDT)) {
 549                 return AE_BAD_HEADER;
 550         }
 551
 552         /* First AML opcode in the table must be a control method */
 553
 554         parser_state.aml = buffer + sizeof(struct acpi_table_header);
 555         opcode = acpi_ps_peek_opcode(&parser_state);
 556         if (opcode != AML_METHOD_OP) {
 557                 return AE_BAD_PARAMETER;
 558         }
 559
 560         /* Extract method information from the raw AML */
 561
 562         parser_state.aml += acpi_ps_get_opcode_size(opcode);
 563         parser_state.pkg_end = acpi_ps_get_next_package_end(&parser_state);
 564         path = acpi_ps_get_next_namestring(&parser_state);
 565         method_flags = *parser_state.aml++;
 566         aml_start = parser_state.aml;
 567         aml_length = ACPI_PTR_DIFF(parser_state.pkg_end, aml_start);
 568
 569         /*
 570          * Allocate resources up-front. We don't want to have to delete a new
 571          * node from the namespace if we cannot allocate memory.
 572          */
 573         aml_buffer = ACPI_ALLOCATE(aml_length);
 574         if (!aml_buffer) {
 575                 return AE_NO_MEMORY;
 576         }
 577
 578         method_obj = acpi_ut_create_internal_object(ACPI_TYPE_METHOD);
 579         if (!method_obj) {
 580                 ACPI_FREE(aml_buffer);
 581                 return AE_NO_MEMORY;
 582         }
 583
 584         /* Lock namespace for acpi_ns_lookup, we may be creating a new node */
 585
 586         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
 587         if (ACPI_FAILURE(status)) {
 588                 goto error_exit;
 589         }
 590
 591         /* The lookup either returns an existing node or creates a new one */
 592
 593         status =
 594             acpi_ns_lookup(NULL, path, ACPI_TYPE_METHOD, ACPI_IMODE_LOAD_PASS1,
 595                            ACPI_NS_DONT_OPEN_SCOPE | ACPI_NS_ERROR_IF_FOUND,
 596                            NULL, &node);
 597
 598         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 599
 600         if (ACPI_FAILURE(status)) {     /* ns_lookup */
 601                 if (status != AE_ALREADY_EXISTS) {
 602                         goto error_exit;
 603                 }
 604
 605                 /* Node existed previously, make sure it is a method node */
 606
 607                 if (node->type != ACPI_TYPE_METHOD) {
 608                         status = AE_TYPE;
 609                         goto error_exit;
 610                 }
 611         }
 612
 613         /* Copy the method AML to the local buffer */
 614
 615         ACPI_MEMCPY(aml_buffer, aml_start, aml_length);
 616
 617         /* Initialize the method object with the new method's information */
 618
 619         method_obj->method.aml_start = aml_buffer;
 620         method_obj->method.aml_length = aml_length;
 621
 622         method_obj->method.param_count = (u8)
 623             (method_flags & AML_METHOD_ARG_COUNT);
 624
 625         if (method_flags & AML_METHOD_SERIALIZED) {
 626                 method_obj->method.info_flags = ACPI_METHOD_SERIALIZED;
 627
 628                 method_obj->method.sync_level = (u8)
 629                     ((method_flags & AML_METHOD_SYNC_LEVEL) >> 4);
 630         }
 631
 632         /*
 633          * Now that it is complete, we can attach the new method object to
 634          * the method Node (detaches/deletes any existing object)
 635          */
 636         status = acpi_ns_attach_object(node, method_obj, ACPI_TYPE_METHOD);
 637
 638         /*
 639          * Flag indicates AML buffer is dynamic, must be deleted later.
 640          * Must be set only after attach above.
 641          */
 642         node->flags |= ANOBJ_ALLOCATED_BUFFER;
 643
 644         /* Remove local reference to the method object */
 645
 646         acpi_ut_remove_reference(method_obj);
 647         return status;
 648
 649 error_exit:
 650
 651         ACPI_FREE(aml_buffer);
 652         ACPI_FREE(method_obj);
 653         return status;
 654 }
 655 ACPI_EXPORT_SYMBOL(acpi_install_method)