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 acpica_device_id *dest,
  57                                     struct acpica_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_STRNCPY(buffer->pointer, acpi_ut_get_node_name(node),
 206                      ACPI_NAME_SIZE);
 207         ((char *)buffer->pointer)[ACPI_NAME_SIZE] = 0;
 208         status = AE_OK;
 209
 210       unlock_and_exit:
 211
 212         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 213         return (status);
 214 }
 215
 216 ACPI_EXPORT_SYMBOL(acpi_get_name)
 217
 218 /******************************************************************************
 219  *
 220  * FUNCTION:    acpi_ns_copy_device_id
 221  *
 222  * PARAMETERS:  dest                - Pointer to the destination DEVICE_ID
 223  *              source              - Pointer to the source DEVICE_ID
 224  *              string_area         - Pointer to where to copy the dest string
 225  *
 226  * RETURN:      Pointer to the next string area
 227  *
 228  * DESCRIPTION: Copy a single DEVICE_ID, including the string data.
 229  *
 230  ******************************************************************************/
 231 static char *acpi_ns_copy_device_id(struct acpica_device_id *dest,
 232                                     struct acpica_device_id *source,
 233                                     char *string_area)
 234 {
 235         /* Create the destination 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, _STA,
 260  * _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 acpica_device_id_list *cid_list = NULL;
 273         struct acpica_device_id *hid = NULL;
 274         struct acpica_device_id *uid = NULL;
 275         char *next_id_string;
 276         acpi_object_type type;
 277         acpi_name name;
 278         u8 param_count = 0;
 279         u8 valid = 0;
 280         u32 info_size;
 281         u32 i;
 282         acpi_status status;
 283
 284         /* Parameter validation */
 285
 286         if (!handle || !return_buffer) {
 287                 return (AE_BAD_PARAMETER);
 288         }
 289
 290         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
 291         if (ACPI_FAILURE(status)) {
 292                 goto cleanup;
 293         }
 294
 295         node = acpi_ns_validate_handle(handle);
 296         if (!node) {
 297                 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 298                 return (AE_BAD_PARAMETER);
 299         }
 300
 301         /* Get the namespace node data while the namespace is locked */
 302
 303         info_size = sizeof(struct acpi_device_info);
 304         type = node->type;
 305         name = node->name.integer;
 306
 307         if (node->type == ACPI_TYPE_METHOD) {
 308                 param_count = node->object->method.param_count;
 309         }
 310
 311         status = acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 312         if (ACPI_FAILURE(status)) {
 313                 return (status);
 314         }
 315
 316         if ((type == ACPI_TYPE_DEVICE) || (type == ACPI_TYPE_PROCESSOR)) {
 317                 /*
 318                  * Get extra info for ACPI Device/Processor objects only:
 319                  * Run the Device _HID, _UID, and _CID methods.
 320                  *
 321                  * Note: none of these methods are required, so they may or may
 322                  * not be present for this device. The Info->Valid bitfield is used
 323                  * to indicate which methods were found and run successfully.
 324                  */
 325
 326                 /* Execute the Device._HID method */
 327
 328                 status = acpi_ut_execute_HID(node, &hid);
 329                 if (ACPI_SUCCESS(status)) {
 330                         info_size += hid->length;
 331                         valid |= ACPI_VALID_HID;
 332                 }
 333
 334                 /* Execute the Device._UID method */
 335
 336                 status = acpi_ut_execute_UID(node, &uid);
 337                 if (ACPI_SUCCESS(status)) {
 338                         info_size += uid->length;
 339                         valid |= ACPI_VALID_UID;
 340                 }
 341
 342                 /* Execute the Device._CID method */
 343
 344                 status = acpi_ut_execute_CID(node, &cid_list);
 345                 if (ACPI_SUCCESS(status)) {
 346
 347                         /* Add size of CID strings and CID pointer array */
 348
 349                         info_size +=
 350                             (cid_list->list_size -
 351                              sizeof(struct acpica_device_id_list));
 352                         valid |= ACPI_VALID_CID;
 353                 }
 354         }
 355
 356         /*
 357          * Now that we have the variable-length data, we can allocate the
 358          * return buffer
 359          */
 360         info = ACPI_ALLOCATE_ZEROED(info_size);
 361         if (!info) {
 362                 status = AE_NO_MEMORY;
 363                 goto cleanup;
 364         }
 365
 366         /* Get the fixed-length data */
 367
 368         if ((type == ACPI_TYPE_DEVICE) || (type == ACPI_TYPE_PROCESSOR)) {
 369                 /*
 370                  * Get extra info for ACPI Device/Processor objects only:
 371                  * Run the _STA, _ADR and, sx_w, and _sx_d methods.
 372                  *
 373                  * Note: none of these methods are required, so they may or may
 374                  * not be present for this device. The Info->Valid bitfield is used
 375                  * to indicate which methods were found and run successfully.
 376                  */
 377
 378                 /* Execute the Device._STA method */
 379
 380                 status = acpi_ut_execute_STA(node, &info->current_status);
 381                 if (ACPI_SUCCESS(status)) {
 382                         valid |= ACPI_VALID_STA;
 383                 }
 384
 385                 /* Execute the Device._ADR method */
 386
 387                 status = acpi_ut_evaluate_numeric_object(METHOD_NAME__ADR, node,
 388                                                          &info->address);
 389                 if (ACPI_SUCCESS(status)) {
 390                         valid |= ACPI_VALID_ADR;
 391                 }
 392
 393                 /* Execute the Device._sx_w methods */
 394
 395                 status = acpi_ut_execute_power_methods(node,
 396                                                        acpi_gbl_lowest_dstate_names,
 397                                                        ACPI_NUM_sx_w_METHODS,
 398                                                        info->lowest_dstates);
 399                 if (ACPI_SUCCESS(status)) {
 400                         valid |= ACPI_VALID_SXWS;
 401                 }
 402
 403                 /* Execute the Device._sx_d methods */
 404
 405                 status = acpi_ut_execute_power_methods(node,
 406                                                        acpi_gbl_highest_dstate_names,
 407                                                        ACPI_NUM_sx_d_METHODS,
 408                                                        info->highest_dstates);
 409                 if (ACPI_SUCCESS(status)) {
 410                         valid |= ACPI_VALID_SXDS;
 411                 }
 412         }
 413
 414         /*
 415          * Create a pointer to the string area of the return buffer.
 416          * Point to the end of the base struct acpi_device_info structure.
 417          */
 418         next_id_string = ACPI_CAST_PTR(char, info->compatible_id_list.ids);
 419         if (cid_list) {
 420
 421                 /* Point past the CID DEVICE_ID array */
 422
 423                 next_id_string +=
 424                     ((acpi_size) cid_list->count *
 425                      sizeof(struct acpica_device_id));
 426         }
 427
 428         /*
 429          * Copy the HID, UID, and CIDs to the return buffer. The variable-length
 430          * strings are copied to the reserved area at the end of the buffer.
 431          *
 432          * For HID and CID, check if the ID is a PCI Root Bridge.
 433          */
 434         if (hid) {
 435                 next_id_string = acpi_ns_copy_device_id(&info->hardware_id,
 436                                                         hid, next_id_string);
 437
 438                 if (acpi_ut_is_pci_root_bridge(hid->string)) {
 439                         info->flags |= ACPI_PCI_ROOT_BRIDGE;
 440                 }
 441         }
 442
 443         if (uid) {
 444                 next_id_string = acpi_ns_copy_device_id(&info->unique_id,
 445                                                         uid, next_id_string);
 446         }
 447
 448         if (cid_list) {
 449                 info->compatible_id_list.count = cid_list->count;
 450                 info->compatible_id_list.list_size = cid_list->list_size;
 451
 452                 /* Copy each CID */
 453
 454                 for (i = 0; i < cid_list->count; i++) {
 455                         next_id_string =
 456                             acpi_ns_copy_device_id(&info->compatible_id_list.
 457                                                    ids[i], &cid_list->ids[i],
 458                                                    next_id_string);
 459
 460                         if (acpi_ut_is_pci_root_bridge(cid_list->ids[i].string)) {
 461                                 info->flags |= ACPI_PCI_ROOT_BRIDGE;
 462                         }
 463                 }
 464         }
 465
 466         /* Copy the fixed-length data */
 467
 468         info->info_size = info_size;
 469         info->type = type;
 470         info->name = name;
 471         info->param_count = param_count;
 472         info->valid = valid;
 473
 474         *return_buffer = info;
 475         status = AE_OK;
 476
 477       cleanup:
 478         if (hid) {
 479                 ACPI_FREE(hid);
 480         }
 481         if (uid) {
 482                 ACPI_FREE(uid);
 483         }
 484         if (cid_list) {
 485                 ACPI_FREE(cid_list);
 486         }
 487         return (status);
 488 }
 489
 490 ACPI_EXPORT_SYMBOL(acpi_get_object_info)
 491
 492 /******************************************************************************
 493  *
 494  * FUNCTION:    acpi_install_method
 495  *
 496  * PARAMETERS:  buffer         - An ACPI table containing one control method
 497  *
 498  * RETURN:      Status
 499  *
 500  * DESCRIPTION: Install a control method into the namespace. If the method
 501  *              name already exists in the namespace, it is overwritten. The
 502  *              input buffer must contain a valid DSDT or SSDT containing a
 503  *              single control method.
 504  *
 505  ******************************************************************************/
 506 acpi_status acpi_install_method(u8 *buffer)
 507 {
 508         struct acpi_table_header *table =
 509             ACPI_CAST_PTR(struct acpi_table_header, buffer);
 510         u8 *aml_buffer;
 511         u8 *aml_start;
 512         char *path;
 513         struct acpi_namespace_node *node;
 514         union acpi_operand_object *method_obj;
 515         struct acpi_parse_state parser_state;
 516         u32 aml_length;
 517         u16 opcode;
 518         u8 method_flags;
 519         acpi_status status;
 520
 521         /* Parameter validation */
 522
 523         if (!buffer) {
 524                 return AE_BAD_PARAMETER;
 525         }
 526
 527         /* Table must be a DSDT or SSDT */
 528
 529         if (!ACPI_COMPARE_NAME(table->signature, ACPI_SIG_DSDT) &&
 530             !ACPI_COMPARE_NAME(table->signature, ACPI_SIG_SSDT)) {
 531                 return AE_BAD_HEADER;
 532         }
 533
 534         /* First AML opcode in the table must be a control method */
 535
 536         parser_state.aml = buffer + sizeof(struct acpi_table_header);
 537         opcode = acpi_ps_peek_opcode(&parser_state);
 538         if (opcode != AML_METHOD_OP) {
 539                 return AE_BAD_PARAMETER;
 540         }
 541
 542         /* Extract method information from the raw AML */
 543
 544         parser_state.aml += acpi_ps_get_opcode_size(opcode);
 545         parser_state.pkg_end = acpi_ps_get_next_package_end(&parser_state);
 546         path = acpi_ps_get_next_namestring(&parser_state);
 547         method_flags = *parser_state.aml++;
 548         aml_start = parser_state.aml;
 549         aml_length = ACPI_PTR_DIFF(parser_state.pkg_end, aml_start);
 550
 551         /*
 552          * Allocate resources up-front. We don't want to have to delete a new
 553          * node from the namespace if we cannot allocate memory.
 554          */
 555         aml_buffer = ACPI_ALLOCATE(aml_length);
 556         if (!aml_buffer) {
 557                 return AE_NO_MEMORY;
 558         }
 559
 560         method_obj = acpi_ut_create_internal_object(ACPI_TYPE_METHOD);
 561         if (!method_obj) {
 562                 ACPI_FREE(aml_buffer);
 563                 return AE_NO_MEMORY;
 564         }
 565
 566         /* Lock namespace for acpi_ns_lookup, we may be creating a new node */
 567
 568         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
 569         if (ACPI_FAILURE(status)) {
 570                 goto error_exit;
 571         }
 572
 573         /* The lookup either returns an existing node or creates a new one */
 574
 575         status =
 576             acpi_ns_lookup(NULL, path, ACPI_TYPE_METHOD, ACPI_IMODE_LOAD_PASS1,
 577                            ACPI_NS_DONT_OPEN_SCOPE | ACPI_NS_ERROR_IF_FOUND,
 578                            NULL, &node);
 579
 580         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 581
 582         if (ACPI_FAILURE(status)) {     /* ns_lookup */
 583                 if (status != AE_ALREADY_EXISTS) {
 584                         goto error_exit;
 585                 }
 586
 587                 /* Node existed previously, make sure it is a method node */
 588
 589                 if (node->type != ACPI_TYPE_METHOD) {
 590                         status = AE_TYPE;
 591                         goto error_exit;
 592                 }
 593         }
 594
 595         /* Copy the method AML to the local buffer */
 596
 597         ACPI_MEMCPY(aml_buffer, aml_start, aml_length);
 598
 599         /* Initialize the method object with the new method's information */
 600
 601         method_obj->method.aml_start = aml_buffer;
 602         method_obj->method.aml_length = aml_length;
 603
 604         method_obj->method.param_count = (u8)
 605             (method_flags & AML_METHOD_ARG_COUNT);
 606
 607         if (method_flags & AML_METHOD_SERIALIZED) {
 608                 method_obj->method.info_flags = ACPI_METHOD_SERIALIZED;
 609
 610                 method_obj->method.sync_level = (u8)
 611                     ((method_flags & AML_METHOD_SYNC_LEVEL) >> 4);
 612         }
 613
 614         /*
 615          * Now that it is complete, we can attach the new method object to
 616          * the method Node (detaches/deletes any existing object)
 617          */
 618         status = acpi_ns_attach_object(node, method_obj, ACPI_TYPE_METHOD);
 619
 620         /*
 621          * Flag indicates AML buffer is dynamic, must be deleted later.
 622          * Must be set only after attach above.
 623          */
 624         node->flags |= ANOBJ_ALLOCATED_BUFFER;
 625
 626         /* Remove local reference to the method object */
 627
 628         acpi_ut_remove_reference(method_obj);
 629         return status;
 630
 631 error_exit:
 632
 633         ACPI_FREE(aml_buffer);
 634         ACPI_FREE(method_obj);
 635         return status;
 636 }
 637 ACPI_EXPORT_SYMBOL(acpi_install_method)