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 #ifdef CONFIG_X86
  37 #include <asm/mpspec.h>
  38 #endif
  39 #include <linux/pci.h>
  40 #include <acpi/acpi_bus.h>
  41 #include <acpi/acpi_drivers.h>
  42 #include <acpi/apei.h>
  43 #include <linux/dmi.h>
  44 #include <linux/suspend.h>
  45
  46 #include "internal.h"
  47
  48 #define _COMPONENT              ACPI_BUS_COMPONENT
  49 ACPI_MODULE_NAME("bus");
  50
  51 struct acpi_device *acpi_root;
  52 struct proc_dir_entry *acpi_root_dir;
  53 EXPORT_SYMBOL(acpi_root_dir);
  54
  55 #define STRUCT_TO_INT(s)        (*((int*)&s))
  56
  57
  58 #ifdef CONFIG_X86
  59 static int set_copy_dsdt(const struct dmi_system_id *id)
  60 {
  61         printk(KERN_NOTICE "%s detected - "
  62                 "force copy of DSDT to local memory\n", id->ident);
  63         acpi_gbl_copy_dsdt_locally = 1;
  64         return 0;
  65 }
  66
  67 static struct dmi_system_id dsdt_dmi_table[] __initdata = {
  68         /*
  69          * Invoke DSDT corruption work-around on all Toshiba Satellite.
  70          * https://bugzilla.kernel.org/show_bug.cgi?id=14679
  71          */
  72         {
  73          .callback = set_copy_dsdt,
  74          .ident = "TOSHIBA Satellite",
  75          .matches = {
  76                 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
  77                 DMI_MATCH(DMI_PRODUCT_NAME, "Satellite"),
  78                 },
  79         },
  80         {}
  81 };
  82 #else
  83 static struct dmi_system_id dsdt_dmi_table[] __initdata = {
  84         {}
  85 };
  86 #endif
  87
  88 /* --------------------------------------------------------------------------
  89                                 Device Management
  90    -------------------------------------------------------------------------- */
  91
  92 acpi_status acpi_bus_get_status_handle(acpi_handle handle,
  93                                        unsigned long long *sta)
  94 {
  95         acpi_status status;
  96
  97         status = acpi_evaluate_integer(handle, "_STA", NULL, sta);
  98         if (ACPI_SUCCESS(status))
  99                 return AE_OK;
 100
 101         if (status == AE_NOT_FOUND) {
 102                 *sta = ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
 103                        ACPI_STA_DEVICE_UI      | ACPI_STA_DEVICE_FUNCTIONING;
 104                 return AE_OK;
 105         }
 106         return status;
 107 }
 108
 109 int acpi_bus_get_status(struct acpi_device *device)
 110 {
 111         acpi_status status;
 112         unsigned long long sta;
 113
 114         status = acpi_bus_get_status_handle(device->handle, &sta);
 115         if (ACPI_FAILURE(status))
 116                 return -ENODEV;
 117
 118         STRUCT_TO_INT(device->status) = (int) sta;
 119
 120         if (device->status.functional && !device->status.present) {
 121                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]: "
 122                        "functional but not present;\n",
 123                         device->pnp.bus_id,
 124                         (u32) STRUCT_TO_INT(device->status)));
 125         }
 126
 127         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]\n",
 128                           device->pnp.bus_id,
 129                           (u32) STRUCT_TO_INT(device->status)));
 130         return 0;
 131 }
 132 EXPORT_SYMBOL(acpi_bus_get_status);
 133
 134 void acpi_bus_private_data_handler(acpi_handle handle,
 135                                    void *context)
 136 {
 137         return;
 138 }
 139 EXPORT_SYMBOL(acpi_bus_private_data_handler);
 140
 141 int acpi_bus_get_private_data(acpi_handle handle, void **data)
 142 {
 143         acpi_status status;
 144
 145         if (!*data)
 146                 return -EINVAL;
 147
 148         status = acpi_get_data(handle, acpi_bus_private_data_handler, data);
 149         if (ACPI_FAILURE(status) || !*data) {
 150                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
 151                                 handle));
 152                 return -ENODEV;
 153         }
 154
 155         return 0;
 156 }
 157 EXPORT_SYMBOL(acpi_bus_get_private_data);
 158
 159 static void acpi_print_osc_error(acpi_handle handle,
 160         struct acpi_osc_context *context, char *error)
 161 {
 162         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER};
 163         int i;
 164
 165         if (ACPI_FAILURE(acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer)))
 166                 printk(KERN_DEBUG "%s\n", error);
 167         else {
 168                 printk(KERN_DEBUG "%s:%s\n", (char *)buffer.pointer, error);
 169                 kfree(buffer.pointer);
 170         }
 171         printk(KERN_DEBUG"_OSC request data:");
 172         for (i = 0; i < context->cap.length; i += sizeof(u32))
 173                 printk("%x ", *((u32 *)(context->cap.pointer + i)));
 174         printk("\n");
 175 }
 176
 177 static acpi_status acpi_str_to_uuid(char *str, u8 *uuid)
 178 {
 179         int i;
 180         static int opc_map_to_uuid[16] = {6, 4, 2, 0, 11, 9, 16, 14, 19, 21,
 181                 24, 26, 28, 30, 32, 34};
 182
 183         if (strlen(str) != 36)
 184                 return AE_BAD_PARAMETER;
 185         for (i = 0; i < 36; i++) {
 186                 if (i == 8 || i == 13 || i == 18 || i == 23) {
 187                         if (str[i] != '-')
 188                                 return AE_BAD_PARAMETER;
 189                 } else if (!isxdigit(str[i]))
 190                         return AE_BAD_PARAMETER;
 191         }
 192         for (i = 0; i < 16; i++) {
 193                 uuid[i] = hex_to_bin(str[opc_map_to_uuid[i]]) << 4;
 194                 uuid[i] |= hex_to_bin(str[opc_map_to_uuid[i] + 1]);
 195         }
 196         return AE_OK;
 197 }
 198
 199 acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context)
 200 {
 201         acpi_status status;
 202         struct acpi_object_list input;
 203         union acpi_object in_params[4];
 204         union acpi_object *out_obj;
 205         u8 uuid[16];
 206         u32 errors;
 207         struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
 208
 209         if (!context)
 210                 return AE_ERROR;
 211         if (ACPI_FAILURE(acpi_str_to_uuid(context->uuid_str, uuid)))
 212                 return AE_ERROR;
 213         context->ret.length = ACPI_ALLOCATE_BUFFER;
 214         context->ret.pointer = NULL;
 215
 216         /* Setting up input parameters */
 217         input.count = 4;
 218         input.pointer = in_params;
 219         in_params[0].type               = ACPI_TYPE_BUFFER;
 220         in_params[0].buffer.length      = 16;
 221         in_params[0].buffer.pointer     = uuid;
 222         in_params[1].type               = ACPI_TYPE_INTEGER;
 223         in_params[1].integer.value      = context->rev;
 224         in_params[2].type               = ACPI_TYPE_INTEGER;
 225         in_params[2].integer.value      = context->cap.length/sizeof(u32);
 226         in_params[3].type               = ACPI_TYPE_BUFFER;
 227         in_params[3].buffer.length      = context->cap.length;
 228         in_params[3].buffer.pointer     = context->cap.pointer;
 229
 230         status = acpi_evaluate_object(handle, "_OSC", &input, &output);
 231         if (ACPI_FAILURE(status))
 232                 return status;
 233
 234         if (!output.length)
 235                 return AE_NULL_OBJECT;
 236
 237         out_obj = output.pointer;
 238         if (out_obj->type != ACPI_TYPE_BUFFER
 239                 || out_obj->buffer.length != context->cap.length) {
 240                 acpi_print_osc_error(handle, context,
 241                         "_OSC evaluation returned wrong type");
 242                 status = AE_TYPE;
 243                 goto out_kfree;
 244         }
 245         /* Need to ignore the bit0 in result code */
 246         errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0);
 247         if (errors) {
 248                 if (errors & OSC_REQUEST_ERROR)
 249                         acpi_print_osc_error(handle, context,
 250                                 "_OSC request failed");
 251                 if (errors & OSC_INVALID_UUID_ERROR)
 252                         acpi_print_osc_error(handle, context,
 253                                 "_OSC invalid UUID");
 254                 if (errors & OSC_INVALID_REVISION_ERROR)
 255                         acpi_print_osc_error(handle, context,
 256                                 "_OSC invalid revision");
 257                 if (errors & OSC_CAPABILITIES_MASK_ERROR) {
 258                         if (((u32 *)context->cap.pointer)[OSC_QUERY_TYPE]
 259                             & OSC_QUERY_ENABLE)
 260                                 goto out_success;
 261                         status = AE_SUPPORT;
 262                         goto out_kfree;
 263                 }
 264                 status = AE_ERROR;
 265                 goto out_kfree;
 266         }
 267 out_success:
 268         context->ret.length = out_obj->buffer.length;
 269         context->ret.pointer = kmemdup(out_obj->buffer.pointer,
 270                                        context->ret.length, GFP_KERNEL);
 271         if (!context->ret.pointer) {
 272                 status =  AE_NO_MEMORY;
 273                 goto out_kfree;
 274         }
 275         status =  AE_OK;
 276
 277 out_kfree:
 278         kfree(output.pointer);
 279         if (status != AE_OK)
 280                 context->ret.pointer = NULL;
 281         return status;
 282 }
 283 EXPORT_SYMBOL(acpi_run_osc);
 284
 285 bool osc_sb_apei_support_acked;
 286 static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48";
 287 static void acpi_bus_osc_support(void)
 288 {
 289         u32 capbuf[2];
 290         struct acpi_osc_context context = {
 291                 .uuid_str = sb_uuid_str,
 292                 .rev = 1,
 293                 .cap.length = 8,
 294                 .cap.pointer = capbuf,
 295         };
 296         acpi_handle handle;
 297
 298         capbuf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE;
 299         capbuf[OSC_SUPPORT_TYPE] = OSC_SB_PR3_SUPPORT; /* _PR3 is in use */
 300 #if defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR) ||\
 301                         defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR_MODULE)
 302         capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_PAD_SUPPORT;
 303 #endif
 304
 305 #if defined(CONFIG_ACPI_PROCESSOR) || defined(CONFIG_ACPI_PROCESSOR_MODULE)
 306         capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_PPC_OST_SUPPORT;
 307 #endif
 308
 309 #ifdef ACPI_HOTPLUG_OST
 310         capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_HOTPLUG_OST_SUPPORT;
 311 #endif
 312
 313         if (!ghes_disable)
 314                 capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_APEI_SUPPORT;
 315         if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
 316                 return;
 317         if (ACPI_SUCCESS(acpi_run_osc(handle, &context))) {
 318                 u32 *capbuf_ret = context.ret.pointer;
 319                 if (context.ret.length > OSC_SUPPORT_TYPE)
 320                         osc_sb_apei_support_acked =
 321                                 capbuf_ret[OSC_SUPPORT_TYPE] & OSC_SB_APEI_SUPPORT;
 322                 kfree(context.ret.pointer);
 323         }
 324         /* do we need to check other returned cap? Sounds no */
 325 }
 326
 327 /* --------------------------------------------------------------------------
 328                              Notification Handling
 329    -------------------------------------------------------------------------- */
 330
 331 static void acpi_bus_check_device(acpi_handle handle)
 332 {
 333         struct acpi_device *device;
 334         acpi_status status;
 335         struct acpi_device_status old_status;
 336
 337         if (acpi_bus_get_device(handle, &device))
 338                 return;
 339         if (!device)
 340                 return;
 341
 342         old_status = device->status;
 343
 344         /*
 345          * Make sure this device's parent is present before we go about
 346          * messing with the device.
 347          */
 348         if (device->parent && !device->parent->status.present) {
 349                 device->status = device->parent->status;
 350                 return;
 351         }
 352
 353         status = acpi_bus_get_status(device);
 354         if (ACPI_FAILURE(status))
 355                 return;
 356
 357         if (STRUCT_TO_INT(old_status) == STRUCT_TO_INT(device->status))
 358                 return;
 359
 360         /*
 361          * Device Insertion/Removal
 362          */
 363         if ((device->status.present) && !(old_status.present)) {
 364                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device insertion detected\n"));
 365                 /* TBD: Handle device insertion */
 366         } else if (!(device->status.present) && (old_status.present)) {
 367                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device removal detected\n"));
 368                 /* TBD: Handle device removal */
 369         }
 370 }
 371
 372 static void acpi_bus_check_scope(acpi_handle handle)
 373 {
 374         /* Status Change? */
 375         acpi_bus_check_device(handle);
 376
 377         /*
 378          * TBD: Enumerate child devices within this device's scope and
 379          *       run acpi_bus_check_device()'s on them.
 380          */
 381 }
 382
 383 /**
 384  * acpi_bus_notify
 385  * ---------------
 386  * Callback for all 'system-level' device notifications (values 0x00-0x7F).
 387  */
 388 static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
 389 {
 390         struct acpi_device *device = NULL;
 391         struct acpi_driver *driver;
 392
 393         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Notification %#02x to handle %p\n",
 394                           type, handle));
 395
 396         switch (type) {
 397
 398         case ACPI_NOTIFY_BUS_CHECK:
 399                 acpi_bus_check_scope(handle);
 400                 /*
 401                  * TBD: We'll need to outsource certain events to non-ACPI
 402                  *      drivers via the device manager (device.c).
 403                  */
 404                 break;
 405
 406         case ACPI_NOTIFY_DEVICE_CHECK:
 407                 acpi_bus_check_device(handle);
 408                 /*
 409                  * TBD: We'll need to outsource certain events to non-ACPI
 410                  *      drivers via the device manager (device.c).
 411                  */
 412                 break;
 413
 414         case ACPI_NOTIFY_DEVICE_WAKE:
 415                 /* TBD */
 416                 break;
 417
 418         case ACPI_NOTIFY_EJECT_REQUEST:
 419                 /* TBD */
 420                 break;
 421
 422         case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
 423                 /* TBD: Exactly what does 'light' mean? */
 424                 break;
 425
 426         case ACPI_NOTIFY_FREQUENCY_MISMATCH:
 427                 /* TBD */
 428                 break;
 429
 430         case ACPI_NOTIFY_BUS_MODE_MISMATCH:
 431                 /* TBD */
 432                 break;
 433
 434         case ACPI_NOTIFY_POWER_FAULT:
 435                 /* TBD */
 436                 break;
 437
 438         default:
 439                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 440                                   "Received unknown/unsupported notification [%08x]\n",
 441                                   type));
 442                 break;
 443         }
 444
 445         acpi_bus_get_device(handle, &device);
 446         if (device) {
 447                 driver = device->driver;
 448                 if (driver && driver->ops.notify &&
 449                     (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS))
 450                         driver->ops.notify(device, type);
 451         }
 452 }
 453
 454 /* --------------------------------------------------------------------------
 455                              Initialization/Cleanup
 456    -------------------------------------------------------------------------- */
 457
 458 static int __init acpi_bus_init_irq(void)
 459 {
 460         acpi_status status;
 461         char *message = NULL;
 462
 463
 464         /*
 465          * Let the system know what interrupt model we are using by
 466          * evaluating the \_PIC object, if exists.
 467          */
 468
 469         switch (acpi_irq_model) {
 470         case ACPI_IRQ_MODEL_PIC:
 471                 message = "PIC";
 472                 break;
 473         case ACPI_IRQ_MODEL_IOAPIC:
 474                 message = "IOAPIC";
 475                 break;
 476         case ACPI_IRQ_MODEL_IOSAPIC:
 477                 message = "IOSAPIC";
 478                 break;
 479         case ACPI_IRQ_MODEL_PLATFORM:
 480                 message = "platform specific model";
 481                 break;
 482         default:
 483                 printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
 484                 return -ENODEV;
 485         }
 486
 487         printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);
 488
 489         status = acpi_execute_simple_method(NULL, "\\_PIC", acpi_irq_model);
 490         if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
 491                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC"));
 492                 return -ENODEV;
 493         }
 494
 495         return 0;
 496 }
 497
 498 u8 acpi_gbl_permanent_mmap;
 499
 500
 501 void __init acpi_early_init(void)
 502 {
 503         acpi_status status;
 504
 505         if (acpi_disabled)
 506                 return;
 507
 508         printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION);
 509
 510         /* enable workarounds, unless strict ACPI spec. compliance */
 511         if (!acpi_strict)
 512                 acpi_gbl_enable_interpreter_slack = TRUE;
 513
 514         acpi_gbl_permanent_mmap = 1;
 515
 516         /*
 517          * If the machine falls into the DMI check table,
 518          * DSDT will be copied to memory
 519          */
 520         dmi_check_system(dsdt_dmi_table);
 521
 522         status = acpi_reallocate_root_table();
 523         if (ACPI_FAILURE(status)) {
 524                 printk(KERN_ERR PREFIX
 525                        "Unable to reallocate ACPI tables\n");
 526                 goto error0;
 527         }
 528
 529         status = acpi_initialize_subsystem();
 530         if (ACPI_FAILURE(status)) {
 531                 printk(KERN_ERR PREFIX
 532                        "Unable to initialize the ACPI Interpreter\n");
 533                 goto error0;
 534         }
 535
 536         status = acpi_load_tables();
 537         if (ACPI_FAILURE(status)) {
 538                 printk(KERN_ERR PREFIX
 539                        "Unable to load the System Description Tables\n");
 540                 goto error0;
 541         }
 542
 543 #ifdef CONFIG_X86
 544         if (!acpi_ioapic) {
 545                 /* compatible (0) means level (3) */
 546                 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
 547                         acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
 548                         acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
 549                 }
 550                 /* Set PIC-mode SCI trigger type */
 551                 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
 552                                          (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
 553         } else {
 554                 /*
 555                  * now that acpi_gbl_FADT is initialized,
 556                  * update it with result from INT_SRC_OVR parsing
 557                  */
 558                 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
 559         }
 560 #endif
 561
 562         status = acpi_enable_subsystem(~ACPI_NO_ACPI_ENABLE);
 563         if (ACPI_FAILURE(status)) {
 564                 printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
 565                 goto error0;
 566         }
 567
 568         return;
 569
 570       error0:
 571         disable_acpi();
 572         return;
 573 }
 574
 575 static int __init acpi_bus_init(void)
 576 {
 577         int result;
 578         acpi_status status;
 579
 580         acpi_os_initialize1();
 581
 582         status = acpi_enable_subsystem(ACPI_NO_ACPI_ENABLE);
 583         if (ACPI_FAILURE(status)) {
 584                 printk(KERN_ERR PREFIX
 585                        "Unable to start the ACPI Interpreter\n");
 586                 goto error1;
 587         }
 588
 589         /*
 590          * ACPI 2.0 requires the EC driver to be loaded and work before
 591          * the EC device is found in the namespace (i.e. before acpi_initialize_objects()
 592          * is called).
 593          *
 594          * This is accomplished by looking for the ECDT table, and getting
 595          * the EC parameters out of that.
 596          */
 597         status = acpi_ec_ecdt_probe();
 598         /* Ignore result. Not having an ECDT is not fatal. */
 599
 600         status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
 601         if (ACPI_FAILURE(status)) {
 602                 printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
 603                 goto error1;
 604         }
 605
 606         /*
 607          * _OSC method may exist in module level code,
 608          * so it must be run after ACPI_FULL_INITIALIZATION
 609          */
 610         acpi_bus_osc_support();
 611
 612         /*
 613          * _PDC control method may load dynamic SSDT tables,
 614          * and we need to install the table handler before that.
 615          */
 616         acpi_sysfs_init();
 617
 618         acpi_early_processor_set_pdc();
 619
 620         /*
 621          * Maybe EC region is required at bus_scan/acpi_get_devices. So it
 622          * is necessary to enable it as early as possible.
 623          */
 624         acpi_boot_ec_enable();
 625
 626         printk(KERN_INFO PREFIX "Interpreter enabled\n");
 627
 628         /* Initialize sleep structures */
 629         acpi_sleep_init();
 630
 631         /*
 632          * Get the system interrupt model and evaluate \_PIC.
 633          */
 634         result = acpi_bus_init_irq();
 635         if (result)
 636                 goto error1;
 637
 638         /*
 639          * Register the for all standard device notifications.
 640          */
 641         status =
 642             acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
 643                                         &acpi_bus_notify, NULL);
 644         if (ACPI_FAILURE(status)) {
 645                 printk(KERN_ERR PREFIX
 646                        "Unable to register for device notifications\n");
 647                 goto error1;
 648         }
 649
 650         /*
 651          * Create the top ACPI proc directory
 652          */
 653         acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
 654
 655         return 0;
 656
 657         /* Mimic structured exception handling */
 658       error1:
 659         acpi_terminate();
 660         return -ENODEV;
 661 }
 662
 663 struct kobject *acpi_kobj;
 664 EXPORT_SYMBOL_GPL(acpi_kobj);
 665
 666 static int __init acpi_init(void)
 667 {
 668         int result;
 669
 670         if (acpi_disabled) {
 671                 printk(KERN_INFO PREFIX "Interpreter disabled.\n");
 672                 return -ENODEV;
 673         }
 674
 675         acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
 676         if (!acpi_kobj) {
 677                 printk(KERN_WARNING "%s: kset create error\n", __func__);
 678                 acpi_kobj = NULL;
 679         }
 680
 681         init_acpi_device_notify();
 682         result = acpi_bus_init();
 683         if (result) {
 684                 disable_acpi();
 685                 return result;
 686         }
 687
 688         pci_mmcfg_late_init();
 689         acpi_scan_init();
 690         acpi_ec_init();
 691         acpi_debugfs_init();
 692         acpi_sleep_proc_init();
 693         acpi_wakeup_device_init();
 694         return 0;
 695 }
 696
 697 subsys_initcall(acpi_init);