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 - 2013, 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 #define EXPORT_ACPI_INTERFACES
  46
  47 #include <acpi/acpi.h>
  48 #include "accommon.h"
  49 #include "acnamesp.h"
  50 #include "acparser.h"
  51 #include "amlcode.h"
  52
  53 #define _COMPONENT          ACPI_NAMESPACE
  54 ACPI_MODULE_NAME("nsxfname")
  55
  56 /* Local prototypes */
  57 static char *acpi_ns_copy_device_id(struct acpi_pnp_device_id *dest,
  58                                     struct acpi_pnp_device_id *source,
  59                                     char *string_area);
  60
  61 /******************************************************************************
  62  *
  63  * FUNCTION:    acpi_get_handle
  64  *
  65  * PARAMETERS:  parent          - Object to search under (search scope).
  66  *              pathname        - Pointer to an asciiz string containing the
  67  *                                name
  68  *              ret_handle      - Where the return handle is returned
  69  *
  70  * RETURN:      Status
  71  *
  72  * DESCRIPTION: This routine will search for a caller specified name in the
  73  *              name space. The caller can restrict the search region by
  74  *              specifying a non NULL parent. The parent value is itself a
  75  *              namespace handle.
  76  *
  77  ******************************************************************************/
  78
  79 acpi_status
  80 acpi_get_handle(acpi_handle parent,
  81                 acpi_string pathname, acpi_handle * ret_handle)
  82 {
  83         acpi_status status;
  84         struct acpi_namespace_node *node = NULL;
  85         struct acpi_namespace_node *prefix_node = NULL;
  86
  87         ACPI_FUNCTION_ENTRY();
  88
  89         /* Parameter Validation */
  90
  91         if (!ret_handle || !pathname) {
  92                 return (AE_BAD_PARAMETER);
  93         }
  94
  95         /* Convert a parent handle to a prefix node */
  96
  97         if (parent) {
  98                 prefix_node = acpi_ns_validate_handle(parent);
  99                 if (!prefix_node) {
 100                         return (AE_BAD_PARAMETER);
 101                 }
 102         }
 103
 104         /*
 105          * Valid cases are:
 106          * 1) Fully qualified pathname
 107          * 2) Parent + Relative pathname
 108          *
 109          * Error for <null Parent + relative path>
 110          */
 111         if (ACPI_IS_ROOT_PREFIX(pathname[0])) {
 112
 113                 /* Pathname is fully qualified (starts with '\') */
 114
 115                 /* Special case for root-only, since we can't search for it */
 116
 117                 if (!ACPI_STRCMP(pathname, ACPI_NS_ROOT_PATH)) {
 118                         *ret_handle =
 119                             ACPI_CAST_PTR(acpi_handle, acpi_gbl_root_node);
 120                         return (AE_OK);
 121                 }
 122         } else if (!prefix_node) {
 123
 124                 /* Relative path with null prefix is disallowed */
 125
 126                 return (AE_BAD_PARAMETER);
 127         }
 128
 129         /* Find the Node and convert to a handle */
 130
 131         status =
 132             acpi_ns_get_node(prefix_node, pathname, ACPI_NS_NO_UPSEARCH, &node);
 133         if (ACPI_SUCCESS(status)) {
 134                 *ret_handle = ACPI_CAST_PTR(acpi_handle, node);
 135         }
 136
 137         return (status);
 138 }
 139
 140 ACPI_EXPORT_SYMBOL(acpi_get_handle)
 141
 142 /******************************************************************************
 143  *
 144  * FUNCTION:    acpi_get_name
 145  *
 146  * PARAMETERS:  handle          - Handle to be converted to a pathname
 147  *              name_type       - Full pathname or single segment
 148  *              buffer          - Buffer for returned path
 149  *
 150  * RETURN:      Pointer to a string containing the fully qualified Name.
 151  *
 152  * DESCRIPTION: This routine returns the fully qualified name associated with
 153  *              the Handle parameter. This and the acpi_pathname_to_handle are
 154  *              complementary functions.
 155  *
 156  ******************************************************************************/
 157 acpi_status
 158 acpi_get_name(acpi_handle handle, u32 name_type, struct acpi_buffer * buffer)
 159 {
 160         acpi_status status;
 161         struct acpi_namespace_node *node;
 162         char *node_name;
 163
 164         /* Parameter validation */
 165
 166         if (name_type > ACPI_NAME_TYPE_MAX) {
 167                 return (AE_BAD_PARAMETER);
 168         }
 169
 170         status = acpi_ut_validate_buffer(buffer);
 171         if (ACPI_FAILURE(status)) {
 172                 return (status);
 173         }
 174
 175         if (name_type == ACPI_FULL_PATHNAME) {
 176
 177                 /* Get the full pathname (From the namespace root) */
 178
 179                 status = acpi_ns_handle_to_pathname(handle, buffer);
 180                 return (status);
 181         }
 182
 183         /*
 184          * Wants the single segment ACPI name.
 185          * Validate handle and convert to a namespace Node
 186          */
 187         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
 188         if (ACPI_FAILURE(status)) {
 189                 return (status);
 190         }
 191
 192         node = acpi_ns_validate_handle(handle);
 193         if (!node) {
 194                 status = AE_BAD_PARAMETER;
 195                 goto unlock_and_exit;
 196         }
 197
 198         /* Validate/Allocate/Clear caller buffer */
 199
 200         status = acpi_ut_initialize_buffer(buffer, ACPI_PATH_SEGMENT_LENGTH);
 201         if (ACPI_FAILURE(status)) {
 202                 goto unlock_and_exit;
 203         }
 204
 205         /* Just copy the ACPI name from the Node and zero terminate it */
 206
 207         node_name = acpi_ut_get_node_name(node);
 208         ACPI_MOVE_NAME(buffer->pointer, node_name);
 209         ((char *)buffer->pointer)[ACPI_NAME_SIZE] = 0;
 210         status = AE_OK;
 211
 212 unlock_and_exit:
 213
 214         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 215         return (status);
 216 }
 217
 218 ACPI_EXPORT_SYMBOL(acpi_get_name)
 219
 220 /******************************************************************************
 221  *
 222  * FUNCTION:    acpi_ns_copy_device_id
 223  *
 224  * PARAMETERS:  dest                - Pointer to the destination PNP_DEVICE_ID
 225  *              source              - Pointer to the source PNP_DEVICE_ID
 226  *              string_area         - Pointer to where to copy the dest string
 227  *
 228  * RETURN:      Pointer to the next string area
 229  *
 230  * DESCRIPTION: Copy a single PNP_DEVICE_ID, including the string data.
 231  *
 232  ******************************************************************************/
 233 static char *acpi_ns_copy_device_id(struct acpi_pnp_device_id *dest,
 234                                     struct acpi_pnp_device_id *source,
 235                                     char *string_area)
 236 {
 237
 238         /* Create the destination PNP_DEVICE_ID */
 239
 240         dest->string = string_area;
 241         dest->length = source->length;
 242
 243         /* Copy actual string and return a pointer to the next string area */
 244
 245         ACPI_MEMCPY(string_area, source->string, source->length);
 246         return (string_area + source->length);
 247 }
 248
 249 /******************************************************************************
 250  *
 251  * FUNCTION:    acpi_get_object_info
 252  *
 253  * PARAMETERS:  handle              - Object Handle
 254  *              return_buffer       - Where the info is returned
 255  *
 256  * RETURN:      Status
 257  *
 258  * DESCRIPTION: Returns information about an object as gleaned from the
 259  *              namespace node and possibly by running several standard
 260  *              control methods (Such as in the case of a device.)
 261  *
 262  * For Device and Processor objects, run the Device _HID, _UID, _CID, _SUB,
 263  * _STA, _ADR, _sx_w, and _sx_d methods.
 264  *
 265  * Note: Allocates the return buffer, must be freed by the caller.
 266  *
 267  ******************************************************************************/
 268
 269 acpi_status
 270 acpi_get_object_info(acpi_handle handle,
 271                      struct acpi_device_info **return_buffer)
 272 {
 273         struct acpi_namespace_node *node;
 274         struct acpi_device_info *info;
 275         struct acpi_pnp_device_id_list *cid_list = NULL;
 276         struct acpi_pnp_device_id *hid = NULL;
 277         struct acpi_pnp_device_id *uid = NULL;
 278         struct acpi_pnp_device_id *sub = NULL;
 279         char *next_id_string;
 280         acpi_object_type type;
 281         acpi_name name;
 282         u8 param_count = 0;
 283         u8 valid = 0;
 284         u32 info_size;
 285         u32 i;
 286         acpi_status status;
 287
 288         /* Parameter validation */
 289
 290         if (!handle || !return_buffer) {
 291                 return (AE_BAD_PARAMETER);
 292         }
 293
 294         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
 295         if (ACPI_FAILURE(status)) {
 296                 return (status);
 297         }
 298
 299         node = acpi_ns_validate_handle(handle);
 300         if (!node) {
 301                 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 302                 return (AE_BAD_PARAMETER);
 303         }
 304
 305         /* Get the namespace node data while the namespace is locked */
 306
 307         info_size = sizeof(struct acpi_device_info);
 308         type = node->type;
 309         name = node->name.integer;
 310
 311         if (node->type == ACPI_TYPE_METHOD) {
 312                 param_count = node->object->method.param_count;
 313         }
 314
 315         status = acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 316         if (ACPI_FAILURE(status)) {
 317                 return (status);
 318         }
 319
 320         if ((type == ACPI_TYPE_DEVICE) || (type == ACPI_TYPE_PROCESSOR)) {
 321                 /*
 322                  * Get extra info for ACPI Device/Processor objects only:
 323                  * Run the Device _HID, _UID, _SUB, and _CID methods.
 324                  *
 325                  * Note: none of these methods are required, so they may or may
 326                  * not be present for this device. The Info->Valid bitfield is used
 327                  * to indicate which methods were found and run successfully.
 328                  */
 329
 330                 /* Execute the Device._HID method */
 331
 332                 status = acpi_ut_execute_HID(node, &hid);
 333                 if (ACPI_SUCCESS(status)) {
 334                         info_size += hid->length;
 335                         valid |= ACPI_VALID_HID;
 336                 }
 337
 338                 /* Execute the Device._UID method */
 339
 340                 status = acpi_ut_execute_UID(node, &uid);
 341                 if (ACPI_SUCCESS(status)) {
 342                         info_size += uid->length;
 343                         valid |= ACPI_VALID_UID;
 344                 }
 345
 346                 /* Execute the Device._SUB method */
 347
 348                 status = acpi_ut_execute_SUB(node, &sub);
 349                 if (ACPI_SUCCESS(status)) {
 350                         info_size += sub->length;
 351                         valid |= ACPI_VALID_SUB;
 352                 }
 353
 354                 /* Execute the Device._CID method */
 355
 356                 status = acpi_ut_execute_CID(node, &cid_list);
 357                 if (ACPI_SUCCESS(status)) {
 358
 359                         /* Add size of CID strings and CID pointer array */
 360
 361                         info_size +=
 362                             (cid_list->list_size -
 363                              sizeof(struct acpi_pnp_device_id_list));
 364                         valid |= ACPI_VALID_CID;
 365                 }
 366         }
 367
 368         /*
 369          * Now that we have the variable-length data, we can allocate the
 370          * return buffer
 371          */
 372         info = ACPI_ALLOCATE_ZEROED(info_size);
 373         if (!info) {
 374                 status = AE_NO_MEMORY;
 375                 goto cleanup;
 376         }
 377
 378         /* Get the fixed-length data */
 379
 380         if ((type == ACPI_TYPE_DEVICE) || (type == ACPI_TYPE_PROCESSOR)) {
 381                 /*
 382                  * Get extra info for ACPI Device/Processor objects only:
 383                  * Run the _STA, _ADR and, sx_w, and _sx_d methods.
 384                  *
 385                  * Notes: none of these methods are required, so they may or may
 386                  * not be present for this device. The Info->Valid bitfield is used
 387                  * to indicate which methods were found and run successfully.
 388                  *
 389                  * For _STA, if the method does not exist, then (as per the ACPI
 390                  * specification), the returned current_status flags will indicate
 391                  * that the device is present/functional/enabled. Otherwise, the
 392                  * current_status flags reflect the value returned from _STA.
 393                  */
 394
 395                 /* Execute the Device._STA method */
 396
 397                 status = acpi_ut_execute_STA(node, &info->current_status);
 398                 if (ACPI_SUCCESS(status)) {
 399                         valid |= ACPI_VALID_STA;
 400                 }
 401
 402                 /* Execute the Device._ADR method */
 403
 404                 status = acpi_ut_evaluate_numeric_object(METHOD_NAME__ADR, node,
 405                                                          &info->address);
 406                 if (ACPI_SUCCESS(status)) {
 407                         valid |= ACPI_VALID_ADR;
 408                 }
 409
 410                 /* Execute the Device._sx_w methods */
 411
 412                 status = acpi_ut_execute_power_methods(node,
 413                                                        acpi_gbl_lowest_dstate_names,
 414                                                        ACPI_NUM_sx_w_METHODS,
 415                                                        info->lowest_dstates);
 416                 if (ACPI_SUCCESS(status)) {
 417                         valid |= ACPI_VALID_SXWS;
 418                 }
 419
 420                 /* Execute the Device._sx_d methods */
 421
 422                 status = acpi_ut_execute_power_methods(node,
 423                                                        acpi_gbl_highest_dstate_names,
 424                                                        ACPI_NUM_sx_d_METHODS,
 425                                                        info->highest_dstates);
 426                 if (ACPI_SUCCESS(status)) {
 427                         valid |= ACPI_VALID_SXDS;
 428                 }
 429         }
 430
 431         /*
 432          * Create a pointer to the string area of the return buffer.
 433          * Point to the end of the base struct acpi_device_info structure.
 434          */
 435         next_id_string = ACPI_CAST_PTR(char, info->compatible_id_list.ids);
 436         if (cid_list) {
 437
 438                 /* Point past the CID PNP_DEVICE_ID array */
 439
 440                 next_id_string +=
 441                     ((acpi_size) cid_list->count *
 442                      sizeof(struct acpi_pnp_device_id));
 443         }
 444
 445         /*
 446          * Copy the HID, UID, SUB, and CIDs to the return buffer.
 447          * The variable-length strings are copied to the reserved area
 448          * at the end of the buffer.
 449          *
 450          * For HID and CID, check if the ID is a PCI Root Bridge.
 451          */
 452         if (hid) {
 453                 next_id_string = acpi_ns_copy_device_id(&info->hardware_id,
 454                                                         hid, next_id_string);
 455
 456                 if (acpi_ut_is_pci_root_bridge(hid->string)) {
 457                         info->flags |= ACPI_PCI_ROOT_BRIDGE;
 458                 }
 459         }
 460
 461         if (uid) {
 462                 next_id_string = acpi_ns_copy_device_id(&info->unique_id,
 463                                                         uid, next_id_string);
 464         }
 465
 466         if (sub) {
 467                 next_id_string = acpi_ns_copy_device_id(&info->subsystem_id,
 468                                                         sub, next_id_string);
 469         }
 470
 471         if (cid_list) {
 472                 info->compatible_id_list.count = cid_list->count;
 473                 info->compatible_id_list.list_size = cid_list->list_size;
 474
 475                 /* Copy each CID */
 476
 477                 for (i = 0; i < cid_list->count; i++) {
 478                         next_id_string =
 479                             acpi_ns_copy_device_id(&info->compatible_id_list.
 480                                                    ids[i], &cid_list->ids[i],
 481                                                    next_id_string);
 482
 483                         if (acpi_ut_is_pci_root_bridge(cid_list->ids[i].string)) {
 484                                 info->flags |= ACPI_PCI_ROOT_BRIDGE;
 485                         }
 486                 }
 487         }
 488
 489         /* Copy the fixed-length data */
 490
 491         info->info_size = info_size;
 492         info->type = type;
 493         info->name = name;
 494         info->param_count = param_count;
 495         info->valid = valid;
 496
 497         *return_buffer = info;
 498         status = AE_OK;
 499
 500 cleanup:
 501         if (hid) {
 502                 ACPI_FREE(hid);
 503         }
 504         if (uid) {
 505                 ACPI_FREE(uid);
 506         }
 507         if (sub) {
 508                 ACPI_FREE(sub);
 509         }
 510         if (cid_list) {
 511                 ACPI_FREE(cid_list);
 512         }
 513         return (status);
 514 }
 515
 516 ACPI_EXPORT_SYMBOL(acpi_get_object_info)
 517
 518 /******************************************************************************
 519  *
 520  * FUNCTION:    acpi_install_method
 521  *
 522  * PARAMETERS:  buffer         - An ACPI table containing one control method
 523  *
 524  * RETURN:      Status
 525  *
 526  * DESCRIPTION: Install a control method into the namespace. If the method
 527  *              name already exists in the namespace, it is overwritten. The
 528  *              input buffer must contain a valid DSDT or SSDT containing a
 529  *              single control method.
 530  *
 531  ******************************************************************************/
 532 acpi_status acpi_install_method(u8 *buffer)
 533 {
 534         struct acpi_table_header *table =
 535             ACPI_CAST_PTR(struct acpi_table_header, buffer);
 536         u8 *aml_buffer;
 537         u8 *aml_start;
 538         char *path;
 539         struct acpi_namespace_node *node;
 540         union acpi_operand_object *method_obj;
 541         struct acpi_parse_state parser_state;
 542         u32 aml_length;
 543         u16 opcode;
 544         u8 method_flags;
 545         acpi_status status;
 546
 547         /* Parameter validation */
 548
 549         if (!buffer) {
 550                 return (AE_BAD_PARAMETER);
 551         }
 552
 553         /* Table must be a DSDT or SSDT */
 554
 555         if (!ACPI_COMPARE_NAME(table->signature, ACPI_SIG_DSDT) &&
 556             !ACPI_COMPARE_NAME(table->signature, ACPI_SIG_SSDT)) {
 557                 return (AE_BAD_HEADER);
 558         }
 559
 560         /* First AML opcode in the table must be a control method */
 561
 562         parser_state.aml = buffer + sizeof(struct acpi_table_header);
 563         opcode = acpi_ps_peek_opcode(&parser_state);
 564         if (opcode != AML_METHOD_OP) {
 565                 return (AE_BAD_PARAMETER);
 566         }
 567
 568         /* Extract method information from the raw AML */
 569
 570         parser_state.aml += acpi_ps_get_opcode_size(opcode);
 571         parser_state.pkg_end = acpi_ps_get_next_package_end(&parser_state);
 572         path = acpi_ps_get_next_namestring(&parser_state);
 573         method_flags = *parser_state.aml++;
 574         aml_start = parser_state.aml;
 575         aml_length = ACPI_PTR_DIFF(parser_state.pkg_end, aml_start);
 576
 577         /*
 578          * Allocate resources up-front. We don't want to have to delete a new
 579          * node from the namespace if we cannot allocate memory.
 580          */
 581         aml_buffer = ACPI_ALLOCATE(aml_length);
 582         if (!aml_buffer) {
 583                 return (AE_NO_MEMORY);
 584         }
 585
 586         method_obj = acpi_ut_create_internal_object(ACPI_TYPE_METHOD);
 587         if (!method_obj) {
 588                 ACPI_FREE(aml_buffer);
 589                 return (AE_NO_MEMORY);
 590         }
 591
 592         /* Lock namespace for acpi_ns_lookup, we may be creating a new node */
 593
 594         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
 595         if (ACPI_FAILURE(status)) {
 596                 goto error_exit;
 597         }
 598
 599         /* The lookup either returns an existing node or creates a new one */
 600
 601         status =
 602             acpi_ns_lookup(NULL, path, ACPI_TYPE_METHOD, ACPI_IMODE_LOAD_PASS1,
 603                            ACPI_NS_DONT_OPEN_SCOPE | ACPI_NS_ERROR_IF_FOUND,
 604                            NULL, &node);
 605
 606         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 607
 608         if (ACPI_FAILURE(status)) {     /* ns_lookup */
 609                 if (status != AE_ALREADY_EXISTS) {
 610                         goto error_exit;
 611                 }
 612
 613                 /* Node existed previously, make sure it is a method node */
 614
 615                 if (node->type != ACPI_TYPE_METHOD) {
 616                         status = AE_TYPE;
 617                         goto error_exit;
 618                 }
 619         }
 620
 621         /* Copy the method AML to the local buffer */
 622
 623         ACPI_MEMCPY(aml_buffer, aml_start, aml_length);
 624
 625         /* Initialize the method object with the new method's information */
 626
 627         method_obj->method.aml_start = aml_buffer;
 628         method_obj->method.aml_length = aml_length;
 629
 630         method_obj->method.param_count = (u8)
 631             (method_flags & AML_METHOD_ARG_COUNT);
 632
 633         if (method_flags & AML_METHOD_SERIALIZED) {
 634                 method_obj->method.info_flags = ACPI_METHOD_SERIALIZED;
 635
 636                 method_obj->method.sync_level = (u8)
 637                     ((method_flags & AML_METHOD_SYNC_LEVEL) >> 4);
 638         }
 639
 640         /*
 641          * Now that it is complete, we can attach the new method object to
 642          * the method Node (detaches/deletes any existing object)
 643          */
 644         status = acpi_ns_attach_object(node, method_obj, ACPI_TYPE_METHOD);
 645
 646         /*
 647          * Flag indicates AML buffer is dynamic, must be deleted later.
 648          * Must be set only after attach above.
 649          */
 650         node->flags |= ANOBJ_ALLOCATED_BUFFER;
 651
 652         /* Remove local reference to the method object */
 653
 654         acpi_ut_remove_reference(method_obj);
 655         return (status);
 656
 657 error_exit:
 658
 659         ACPI_FREE(aml_buffer);
 660         ACPI_FREE(method_obj);
 661         return (status);
 662 }
 663 ACPI_EXPORT_SYMBOL(acpi_install_method)