drivers/acpi/bus.c

   1 /*
   2  *  acpi_bus.c - ACPI Bus Driver ($Revision: 80 $)
   3  *
   4  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
   5  *
   6  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   7  *
   8  *  This program is free software; you can redistribute it and/or modify
   9  *  it under the terms of the GNU General Public License as published by
  10  *  the Free Software Foundation; either version 2 of the License, or (at
  11  *  your option) any later version.
  12  *
  13  *  This program is distributed in the hope that it will be useful, but
  14  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  *  General Public License for more details.
  17  *
  18  *  You should have received a copy of the GNU General Public License along
  19  *  with this program; if not, write to the Free Software Foundation, Inc.,
  20  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  21  *
  22  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  23  */
  24
  25 #include <linux/module.h>
  26 #include <linux/init.h>
  27 #include <linux/ioport.h>
  28 #include <linux/kernel.h>
  29 #include <linux/list.h>
  30 #include <linux/sched.h>
  31 #include <linux/pm.h>
  32 #include <linux/device.h>
  33 #include <linux/proc_fs.h>
  34 #include <linux/acpi.h>
  35 #include <linux/slab.h>
  36 #include <linux/regulator/machine.h>
  37 #ifdef CONFIG_X86
  38 #include <asm/mpspec.h>
  39 #endif
  40 #include <linux/pci.h>
  41 #include <acpi/apei.h>
  42 #include <linux/dmi.h>
  43 #include <linux/suspend.h>
  44
  45 #include "internal.h"
  46
  47 #define _COMPONENT              ACPI_BUS_COMPONENT
  48 ACPI_MODULE_NAME("bus");
  49
  50 struct acpi_device *acpi_root;
  51 struct proc_dir_entry *acpi_root_dir;
  52 EXPORT_SYMBOL(acpi_root_dir);
  53
  54 #ifdef CONFIG_X86
  55 static int set_copy_dsdt(const struct dmi_system_id *id)
  56 {
  57         printk(KERN_NOTICE "%s detected - "
  58                 "force copy of DSDT to local memory\n", id->ident);
  59         acpi_gbl_copy_dsdt_locally = 1;
  60         return 0;
  61 }
  62
  63 static struct dmi_system_id dsdt_dmi_table[] __initdata = {
  64         /*
  65          * Invoke DSDT corruption work-around on all Toshiba Satellite.
  66          * https://bugzilla.kernel.org/show_bug.cgi?id=14679
  67          */
  68         {
  69          .callback = set_copy_dsdt,
  70          .ident = "TOSHIBA Satellite",
  71          .matches = {
  72                 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
  73                 DMI_MATCH(DMI_PRODUCT_NAME, "Satellite"),
  74                 },
  75         },
  76         {}
  77 };
  78 #else
  79 static struct dmi_system_id dsdt_dmi_table[] __initdata = {
  80         {}
  81 };
  82 #endif
  83
  84 /* --------------------------------------------------------------------------
  85                                 Device Management
  86    -------------------------------------------------------------------------- */
  87
  88 acpi_status acpi_bus_get_status_handle(acpi_handle handle,
  89                                        unsigned long long *sta)
  90 {
  91         acpi_status status;
  92
  93         status = acpi_evaluate_integer(handle, "_STA", NULL, sta);
  94         if (ACPI_SUCCESS(status))
  95                 return AE_OK;
  96
  97         if (status == AE_NOT_FOUND) {
  98                 *sta = ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
  99                        ACPI_STA_DEVICE_UI      | ACPI_STA_DEVICE_FUNCTIONING;
 100                 return AE_OK;
 101         }
 102         return status;
 103 }
 104
 105 int acpi_bus_get_status(struct acpi_device *device)
 106 {
 107         acpi_status status;
 108         unsigned long long sta;
 109
 110         status = acpi_bus_get_status_handle(device->handle, &sta);
 111         if (ACPI_FAILURE(status))
 112                 return -ENODEV;
 113
 114         acpi_set_device_status(device, sta);
 115
 116         if (device->status.functional && !device->status.present) {
 117                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]: "
 118                        "functional but not present;\n",
 119                         device->pnp.bus_id, (u32)sta));
 120         }
 121
 122         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]\n",
 123                           device->pnp.bus_id, (u32)sta));
 124         return 0;
 125 }
 126 EXPORT_SYMBOL(acpi_bus_get_status);
 127
 128 void acpi_bus_private_data_handler(acpi_handle handle,
 129                                    void *context)
 130 {
 131         return;
 132 }
 133 EXPORT_SYMBOL(acpi_bus_private_data_handler);
 134
 135 int acpi_bus_get_private_data(acpi_handle handle, void **data)
 136 {
 137         acpi_status status;
 138
 139         if (!*data)
 140                 return -EINVAL;
 141
 142         status = acpi_get_data(handle, acpi_bus_private_data_handler, data);
 143         if (ACPI_FAILURE(status) || !*data) {
 144                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
 145                                 handle));
 146                 return -ENODEV;
 147         }
 148
 149         return 0;
 150 }
 151 EXPORT_SYMBOL(acpi_bus_get_private_data);
 152
 153 void acpi_bus_no_hotplug(acpi_handle handle)
 154 {
 155         struct acpi_device *adev = NULL;
 156
 157         acpi_bus_get_device(handle, &adev);
 158         if (adev)
 159                 adev->flags.no_hotplug = true;
 160 }
 161 EXPORT_SYMBOL_GPL(acpi_bus_no_hotplug);
 162
 163 static void acpi_print_osc_error(acpi_handle handle,
 164         struct acpi_osc_context *context, char *error)
 165 {
 166         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER};
 167         int i;
 168
 169         if (ACPI_FAILURE(acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer)))
 170                 printk(KERN_DEBUG "%s\n", error);
 171         else {
 172                 printk(KERN_DEBUG "%s:%s\n", (char *)buffer.pointer, error);
 173                 kfree(buffer.pointer);
 174         }
 175         printk(KERN_DEBUG"_OSC request data:");
 176         for (i = 0; i < context->cap.length; i += sizeof(u32))
 177                 printk("%x ", *((u32 *)(context->cap.pointer + i)));
 178         printk("\n");
 179 }
 180
 181 acpi_status acpi_str_to_uuid(char *str, u8 *uuid)
 182 {
 183         int i;
 184         static int opc_map_to_uuid[16] = {6, 4, 2, 0, 11, 9, 16, 14, 19, 21,
 185                 24, 26, 28, 30, 32, 34};
 186
 187         if (strlen(str) != 36)
 188                 return AE_BAD_PARAMETER;
 189         for (i = 0; i < 36; i++) {
 190                 if (i == 8 || i == 13 || i == 18 || i == 23) {
 191                         if (str[i] != '-')
 192                                 return AE_BAD_PARAMETER;
 193                 } else if (!isxdigit(str[i]))
 194                         return AE_BAD_PARAMETER;
 195         }
 196         for (i = 0; i < 16; i++) {
 197                 uuid[i] = hex_to_bin(str[opc_map_to_uuid[i]]) << 4;
 198                 uuid[i] |= hex_to_bin(str[opc_map_to_uuid[i] + 1]);
 199         }
 200         return AE_OK;
 201 }
 202 EXPORT_SYMBOL_GPL(acpi_str_to_uuid);
 203
 204 acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context)
 205 {
 206         acpi_status status;
 207         struct acpi_object_list input;
 208         union acpi_object in_params[4];
 209         union acpi_object *out_obj;
 210         u8 uuid[16];
 211         u32 errors;
 212         struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
 213
 214         if (!context)
 215                 return AE_ERROR;
 216         if (ACPI_FAILURE(acpi_str_to_uuid(context->uuid_str, uuid)))
 217                 return AE_ERROR;
 218         context->ret.length = ACPI_ALLOCATE_BUFFER;
 219         context->ret.pointer = NULL;
 220
 221         /* Setting up input parameters */
 222         input.count = 4;
 223         input.pointer = in_params;
 224         in_params[0].type               = ACPI_TYPE_BUFFER;
 225         in_params[0].buffer.length      = 16;
 226         in_params[0].buffer.pointer     = uuid;
 227         in_params[1].type               = ACPI_TYPE_INTEGER;
 228         in_params[1].integer.value      = context->rev;
 229         in_params[2].type               = ACPI_TYPE_INTEGER;
 230         in_params[2].integer.value      = context->cap.length/sizeof(u32);
 231         in_params[3].type               = ACPI_TYPE_BUFFER;
 232         in_params[3].buffer.length      = context->cap.length;
 233         in_params[3].buffer.pointer     = context->cap.pointer;
 234
 235         status = acpi_evaluate_object(handle, "_OSC", &input, &output);
 236         if (ACPI_FAILURE(status))
 237                 return status;
 238
 239         if (!output.length)
 240                 return AE_NULL_OBJECT;
 241
 242         out_obj = output.pointer;
 243         if (out_obj->type != ACPI_TYPE_BUFFER
 244                 || out_obj->buffer.length != context->cap.length) {
 245                 acpi_print_osc_error(handle, context,
 246                         "_OSC evaluation returned wrong type");
 247                 status = AE_TYPE;
 248                 goto out_kfree;
 249         }
 250         /* Need to ignore the bit0 in result code */
 251         errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0);
 252         if (errors) {
 253                 if (errors & OSC_REQUEST_ERROR)
 254                         acpi_print_osc_error(handle, context,
 255                                 "_OSC request failed");
 256                 if (errors & OSC_INVALID_UUID_ERROR)
 257                         acpi_print_osc_error(handle, context,
 258                                 "_OSC invalid UUID");
 259                 if (errors & OSC_INVALID_REVISION_ERROR)
 260                         acpi_print_osc_error(handle, context,
 261                                 "_OSC invalid revision");
 262                 if (errors & OSC_CAPABILITIES_MASK_ERROR) {
 263                         if (((u32 *)context->cap.pointer)[OSC_QUERY_DWORD]
 264                             & OSC_QUERY_ENABLE)
 265                                 goto out_success;
 266                         status = AE_SUPPORT;
 267                         goto out_kfree;
 268                 }
 269                 status = AE_ERROR;
 270                 goto out_kfree;
 271         }
 272 out_success:
 273         context->ret.length = out_obj->buffer.length;
 274         context->ret.pointer = kmemdup(out_obj->buffer.pointer,
 275                                        context->ret.length, GFP_KERNEL);
 276         if (!context->ret.pointer) {
 277                 status =  AE_NO_MEMORY;
 278                 goto out_kfree;
 279         }
 280         status =  AE_OK;
 281
 282 out_kfree:
 283         kfree(output.pointer);
 284         if (status != AE_OK)
 285                 context->ret.pointer = NULL;
 286         return status;
 287 }
 288 EXPORT_SYMBOL(acpi_run_osc);
 289
 290 bool osc_sb_apei_support_acked;
 291 static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48";
 292 static void acpi_bus_osc_support(void)
 293 {
 294         u32 capbuf[2];
 295         struct acpi_osc_context context = {
 296                 .uuid_str = sb_uuid_str,
 297                 .rev = 1,
 298                 .cap.length = 8,
 299                 .cap.pointer = capbuf,
 300         };
 301         acpi_handle handle;
 302
 303         capbuf[OSC_QUERY_DWORD] = OSC_QUERY_ENABLE;
 304         capbuf[OSC_SUPPORT_DWORD] = OSC_SB_PR3_SUPPORT; /* _PR3 is in use */
 305 #if defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR) ||\
 306                         defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR_MODULE)
 307         capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PAD_SUPPORT;
 308 #endif
 309
 310 #if defined(CONFIG_ACPI_PROCESSOR) || defined(CONFIG_ACPI_PROCESSOR_MODULE)
 311         capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PPC_OST_SUPPORT;
 312 #endif
 313
 314         capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_HOTPLUG_OST_SUPPORT;
 315
 316         if (!ghes_disable)
 317                 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_APEI_SUPPORT;
 318         if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
 319                 return;
 320         if (ACPI_SUCCESS(acpi_run_osc(handle, &context))) {
 321                 u32 *capbuf_ret = context.ret.pointer;
 322                 if (context.ret.length > OSC_SUPPORT_DWORD)
 323                         osc_sb_apei_support_acked =
 324                                 capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_APEI_SUPPORT;
 325                 kfree(context.ret.pointer);
 326         }
 327         /* do we need to check other returned cap? Sounds no */
 328 }
 329
 330 /* --------------------------------------------------------------------------
 331                              Notification Handling
 332    -------------------------------------------------------------------------- */
 333
 334 /**
 335  * acpi_bus_notify
 336  * ---------------
 337  * Callback for all 'system-level' device notifications (values 0x00-0x7F).
 338  */
 339 static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
 340 {
 341         struct acpi_device *adev;
 342         struct acpi_driver *driver;
 343         u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
 344         bool hotplug_event = false;
 345
 346         switch (type) {
 347         case ACPI_NOTIFY_BUS_CHECK:
 348                 acpi_handle_debug(handle, "ACPI_NOTIFY_BUS_CHECK event\n");
 349                 hotplug_event = true;
 350                 break;
 351
 352         case ACPI_NOTIFY_DEVICE_CHECK:
 353                 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK event\n");
 354                 hotplug_event = true;
 355                 break;
 356
 357         case ACPI_NOTIFY_DEVICE_WAKE:
 358                 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_WAKE event\n");
 359                 break;
 360
 361         case ACPI_NOTIFY_EJECT_REQUEST:
 362                 acpi_handle_debug(handle, "ACPI_NOTIFY_EJECT_REQUEST event\n");
 363                 hotplug_event = true;
 364                 break;
 365
 366         case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
 367                 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK_LIGHT event\n");
 368                 /* TBD: Exactly what does 'light' mean? */
 369                 break;
 370
 371         case ACPI_NOTIFY_FREQUENCY_MISMATCH:
 372                 acpi_handle_err(handle, "Device cannot be configured due "
 373                                 "to a frequency mismatch\n");
 374                 break;
 375
 376         case ACPI_NOTIFY_BUS_MODE_MISMATCH:
 377                 acpi_handle_err(handle, "Device cannot be configured due "
 378                                 "to a bus mode mismatch\n");
 379                 break;
 380
 381         case ACPI_NOTIFY_POWER_FAULT:
 382                 acpi_handle_err(handle, "Device has suffered a power fault\n");
 383                 break;
 384
 385         default:
 386                 acpi_handle_debug(handle, "Unknown event type 0x%x\n", type);
 387                 break;
 388         }
 389
 390         adev = acpi_bus_get_acpi_device(handle);
 391         if (!adev)
 392                 goto err;
 393
 394         driver = adev->driver;
 395         if (driver && driver->ops.notify &&
 396             (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS))
 397                 driver->ops.notify(adev, type);
 398
 399         if (hotplug_event && ACPI_SUCCESS(acpi_hotplug_schedule(adev, type)))
 400                 return;
 401
 402         acpi_bus_put_acpi_device(adev);
 403         return;
 404
 405  err:
 406         acpi_evaluate_ost(handle, type, ost_code, NULL);
 407 }
 408
 409 /* --------------------------------------------------------------------------
 410                              Initialization/Cleanup
 411    -------------------------------------------------------------------------- */
 412
 413 static int __init acpi_bus_init_irq(void)
 414 {
 415         acpi_status status;
 416         char *message = NULL;
 417
 418
 419         /*
 420          * Let the system know what interrupt model we are using by
 421          * evaluating the \_PIC object, if exists.
 422          */
 423
 424         switch (acpi_irq_model) {
 425         case ACPI_IRQ_MODEL_PIC:
 426                 message = "PIC";
 427                 break;
 428         case ACPI_IRQ_MODEL_IOAPIC:
 429                 message = "IOAPIC";
 430                 break;
 431         case ACPI_IRQ_MODEL_IOSAPIC:
 432                 message = "IOSAPIC";
 433                 break;
 434         case ACPI_IRQ_MODEL_PLATFORM:
 435                 message = "platform specific model";
 436                 break;
 437         default:
 438                 printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
 439                 return -ENODEV;
 440         }
 441
 442         printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);
 443
 444         status = acpi_execute_simple_method(NULL, "\\_PIC", acpi_irq_model);
 445         if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
 446                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC"));
 447                 return -ENODEV;
 448         }
 449
 450         return 0;
 451 }
 452
 453 u8 acpi_gbl_permanent_mmap;
 454
 455
 456 void __init acpi_early_init(void)
 457 {
 458         acpi_status status;
 459
 460         if (acpi_disabled)
 461                 return;
 462
 463         printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION);
 464
 465         /* enable workarounds, unless strict ACPI spec. compliance */
 466         if (!acpi_strict)
 467                 acpi_gbl_enable_interpreter_slack = TRUE;
 468
 469         acpi_gbl_permanent_mmap = 1;
 470
 471         /*
 472          * If the machine falls into the DMI check table,
 473          * DSDT will be copied to memory
 474          */
 475         dmi_check_system(dsdt_dmi_table);
 476
 477         status = acpi_reallocate_root_table();
 478         if (ACPI_FAILURE(status)) {
 479                 printk(KERN_ERR PREFIX
 480                        "Unable to reallocate ACPI tables\n");
 481                 goto error0;
 482         }
 483
 484         status = acpi_initialize_subsystem();
 485         if (ACPI_FAILURE(status)) {
 486                 printk(KERN_ERR PREFIX
 487                        "Unable to initialize the ACPI Interpreter\n");
 488                 goto error0;
 489         }
 490
 491         status = acpi_load_tables();
 492         if (ACPI_FAILURE(status)) {
 493                 printk(KERN_ERR PREFIX
 494                        "Unable to load the System Description Tables\n");
 495                 goto error0;
 496         }
 497
 498 #ifdef CONFIG_X86
 499         if (!acpi_ioapic) {
 500                 /* compatible (0) means level (3) */
 501                 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
 502                         acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
 503                         acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
 504                 }
 505                 /* Set PIC-mode SCI trigger type */
 506                 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
 507                                          (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
 508         } else {
 509                 /*
 510                  * now that acpi_gbl_FADT is initialized,
 511                  * update it with result from INT_SRC_OVR parsing
 512                  */
 513                 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
 514         }
 515 #endif
 516
 517         status = acpi_enable_subsystem(~ACPI_NO_ACPI_ENABLE);
 518         if (ACPI_FAILURE(status)) {
 519                 printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
 520                 goto error0;
 521         }
 522
 523         /*
 524          * If the system is using ACPI then we can be reasonably
 525          * confident that any regulators are managed by the firmware
 526          * so tell the regulator core it has everything it needs to
 527          * know.
 528          */
 529         regulator_has_full_constraints();
 530
 531         return;
 532
 533       error0:
 534         disable_acpi();
 535         return;
 536 }
 537
 538 static int __init acpi_bus_init(void)
 539 {
 540         int result;
 541         acpi_status status;
 542
 543         acpi_os_initialize1();
 544
 545         status = acpi_enable_subsystem(ACPI_NO_ACPI_ENABLE);
 546         if (ACPI_FAILURE(status)) {
 547                 printk(KERN_ERR PREFIX
 548                        "Unable to start the ACPI Interpreter\n");
 549                 goto error1;
 550         }
 551
 552         /*
 553          * ACPI 2.0 requires the EC driver to be loaded and work before
 554          * the EC device is found in the namespace (i.e. before acpi_initialize_objects()
 555          * is called).
 556          *
 557          * This is accomplished by looking for the ECDT table, and getting
 558          * the EC parameters out of that.
 559          */
 560         status = acpi_ec_ecdt_probe();
 561         /* Ignore result. Not having an ECDT is not fatal. */
 562
 563         status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
 564         if (ACPI_FAILURE(status)) {
 565                 printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
 566                 goto error1;
 567         }
 568
 569         /*
 570          * _OSC method may exist in module level code,
 571          * so it must be run after ACPI_FULL_INITIALIZATION
 572          */
 573         acpi_bus_osc_support();
 574
 575         /*
 576          * _PDC control method may load dynamic SSDT tables,
 577          * and we need to install the table handler before that.
 578          */
 579         acpi_sysfs_init();
 580
 581         acpi_early_processor_set_pdc();
 582
 583         /*
 584          * Maybe EC region is required at bus_scan/acpi_get_devices. So it
 585          * is necessary to enable it as early as possible.
 586          */
 587         acpi_boot_ec_enable();
 588
 589         printk(KERN_INFO PREFIX "Interpreter enabled\n");
 590
 591         /* Initialize sleep structures */
 592         acpi_sleep_init();
 593
 594         /*
 595          * Get the system interrupt model and evaluate \_PIC.
 596          */
 597         result = acpi_bus_init_irq();
 598         if (result)
 599                 goto error1;
 600
 601         /*
 602          * Register the for all standard device notifications.
 603          */
 604         status =
 605             acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
 606                                         &acpi_bus_notify, NULL);
 607         if (ACPI_FAILURE(status)) {
 608                 printk(KERN_ERR PREFIX
 609                        "Unable to register for device notifications\n");
 610                 goto error1;
 611         }
 612
 613         /*
 614          * Create the top ACPI proc directory
 615          */
 616         acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
 617
 618         return 0;
 619
 620         /* Mimic structured exception handling */
 621       error1:
 622         acpi_terminate();
 623         return -ENODEV;
 624 }
 625
 626 struct kobject *acpi_kobj;
 627 EXPORT_SYMBOL_GPL(acpi_kobj);
 628
 629 static int __init acpi_init(void)
 630 {
 631         int result;
 632
 633         if (acpi_disabled) {
 634                 printk(KERN_INFO PREFIX "Interpreter disabled.\n");
 635                 return -ENODEV;
 636         }
 637
 638         acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
 639         if (!acpi_kobj) {
 640                 printk(KERN_WARNING "%s: kset create error\n", __func__);
 641                 acpi_kobj = NULL;
 642         }
 643
 644         init_acpi_device_notify();
 645         result = acpi_bus_init();
 646         if (result) {
 647                 disable_acpi();
 648                 return result;
 649         }
 650
 651         pci_mmcfg_late_init();
 652         acpi_scan_init();
 653         acpi_ec_init();
 654         acpi_debugfs_init();
 655         acpi_sleep_proc_init();
 656         acpi_wakeup_device_init();
 657         return 0;
 658 }
 659
 660 subsys_initcall(acpi_init);