Pileus Git - ~andy/linux/blob - 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 #ifdef ACPI_HOTPLUG_OST
 315         capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_HOTPLUG_OST_SUPPORT;
 316 #endif
 317
 318         if (!ghes_disable)
 319                 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_APEI_SUPPORT;
 320         if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
 321                 return;
 322         if (ACPI_SUCCESS(acpi_run_osc(handle, &context))) {
 323                 u32 *capbuf_ret = context.ret.pointer;
 324                 if (context.ret.length > OSC_SUPPORT_DWORD)
 325                         osc_sb_apei_support_acked =
 326                                 capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_APEI_SUPPORT;
 327                 kfree(context.ret.pointer);
 328         }
 329         /* do we need to check other returned cap? Sounds no */
 330 }
 331
 332 /* --------------------------------------------------------------------------
 333                              Notification Handling
 334    -------------------------------------------------------------------------- */
 335
 336 /**
 337  * acpi_bus_notify
 338  * ---------------
 339  * Callback for all 'system-level' device notifications (values 0x00-0x7F).
 340  */
 341 static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
 342 {
 343         struct acpi_device *device = NULL;
 344         struct acpi_driver *driver;
 345
 346         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Notification %#02x to handle %p\n",
 347                           type, handle));
 348
 349         switch (type) {
 350
 351         case ACPI_NOTIFY_BUS_CHECK:
 352                 /* TBD */
 353                 break;
 354
 355         case ACPI_NOTIFY_DEVICE_CHECK:
 356                 /* TBD */
 357                 break;
 358
 359         case ACPI_NOTIFY_DEVICE_WAKE:
 360                 /* TBD */
 361                 break;
 362
 363         case ACPI_NOTIFY_EJECT_REQUEST:
 364                 /* TBD */
 365                 break;
 366
 367         case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
 368                 /* TBD: Exactly what does 'light' mean? */
 369                 break;
 370
 371         case ACPI_NOTIFY_FREQUENCY_MISMATCH:
 372                 /* TBD */
 373                 break;
 374
 375         case ACPI_NOTIFY_BUS_MODE_MISMATCH:
 376                 /* TBD */
 377                 break;
 378
 379         case ACPI_NOTIFY_POWER_FAULT:
 380                 /* TBD */
 381                 break;
 382
 383         default:
 384                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 385                                   "Received unknown/unsupported notification [%08x]\n",
 386                                   type));
 387                 break;
 388         }
 389
 390         acpi_bus_get_device(handle, &device);
 391         if (device) {
 392                 driver = device->driver;
 393                 if (driver && driver->ops.notify &&
 394                     (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS))
 395                         driver->ops.notify(device, type);
 396         }
 397 }
 398
 399 /* --------------------------------------------------------------------------
 400                              Initialization/Cleanup
 401    -------------------------------------------------------------------------- */
 402
 403 static int __init acpi_bus_init_irq(void)
 404 {
 405         acpi_status status;
 406         char *message = NULL;
 407
 408
 409         /*
 410          * Let the system know what interrupt model we are using by
 411          * evaluating the \_PIC object, if exists.
 412          */
 413
 414         switch (acpi_irq_model) {
 415         case ACPI_IRQ_MODEL_PIC:
 416                 message = "PIC";
 417                 break;
 418         case ACPI_IRQ_MODEL_IOAPIC:
 419                 message = "IOAPIC";
 420                 break;
 421         case ACPI_IRQ_MODEL_IOSAPIC:
 422                 message = "IOSAPIC";
 423                 break;
 424         case ACPI_IRQ_MODEL_PLATFORM:
 425                 message = "platform specific model";
 426                 break;
 427         default:
 428                 printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
 429                 return -ENODEV;
 430         }
 431
 432         printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);
 433
 434         status = acpi_execute_simple_method(NULL, "\\_PIC", acpi_irq_model);
 435         if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
 436                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC"));
 437                 return -ENODEV;
 438         }
 439
 440         return 0;
 441 }
 442
 443 u8 acpi_gbl_permanent_mmap;
 444
 445
 446 void __init acpi_early_init(void)
 447 {
 448         acpi_status status;
 449
 450         if (acpi_disabled)
 451                 return;
 452
 453         printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION);
 454
 455         /* enable workarounds, unless strict ACPI spec. compliance */
 456         if (!acpi_strict)
 457                 acpi_gbl_enable_interpreter_slack = TRUE;
 458
 459         acpi_gbl_permanent_mmap = 1;
 460
 461         /*
 462          * If the machine falls into the DMI check table,
 463          * DSDT will be copied to memory
 464          */
 465         dmi_check_system(dsdt_dmi_table);
 466
 467         status = acpi_reallocate_root_table();
 468         if (ACPI_FAILURE(status)) {
 469                 printk(KERN_ERR PREFIX
 470                        "Unable to reallocate ACPI tables\n");
 471                 goto error0;
 472         }
 473
 474         status = acpi_initialize_subsystem();
 475         if (ACPI_FAILURE(status)) {
 476                 printk(KERN_ERR PREFIX
 477                        "Unable to initialize the ACPI Interpreter\n");
 478                 goto error0;
 479         }
 480
 481         status = acpi_load_tables();
 482         if (ACPI_FAILURE(status)) {
 483                 printk(KERN_ERR PREFIX
 484                        "Unable to load the System Description Tables\n");
 485                 goto error0;
 486         }
 487
 488 #ifdef CONFIG_X86
 489         if (!acpi_ioapic) {
 490                 /* compatible (0) means level (3) */
 491                 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
 492                         acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
 493                         acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
 494                 }
 495                 /* Set PIC-mode SCI trigger type */
 496                 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
 497                                          (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
 498         } else {
 499                 /*
 500                  * now that acpi_gbl_FADT is initialized,
 501                  * update it with result from INT_SRC_OVR parsing
 502                  */
 503                 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
 504         }
 505 #endif
 506
 507         status = acpi_enable_subsystem(~ACPI_NO_ACPI_ENABLE);
 508         if (ACPI_FAILURE(status)) {
 509                 printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
 510                 goto error0;
 511         }
 512
 513         /*
 514          * If the system is using ACPI then we can be reasonably
 515          * confident that any regulators are managed by the firmware
 516          * so tell the regulator core it has everything it needs to
 517          * know.
 518          */
 519         regulator_has_full_constraints();
 520
 521         return;
 522
 523       error0:
 524         disable_acpi();
 525         return;
 526 }
 527
 528 static int __init acpi_bus_init(void)
 529 {
 530         int result;
 531         acpi_status status;
 532
 533         acpi_os_initialize1();
 534
 535         status = acpi_enable_subsystem(ACPI_NO_ACPI_ENABLE);
 536         if (ACPI_FAILURE(status)) {
 537                 printk(KERN_ERR PREFIX
 538                        "Unable to start the ACPI Interpreter\n");
 539                 goto error1;
 540         }
 541
 542         /*
 543          * ACPI 2.0 requires the EC driver to be loaded and work before
 544          * the EC device is found in the namespace (i.e. before acpi_initialize_objects()
 545          * is called).
 546          *
 547          * This is accomplished by looking for the ECDT table, and getting
 548          * the EC parameters out of that.
 549          */
 550         status = acpi_ec_ecdt_probe();
 551         /* Ignore result. Not having an ECDT is not fatal. */
 552
 553         status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
 554         if (ACPI_FAILURE(status)) {
 555                 printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
 556                 goto error1;
 557         }
 558
 559         /*
 560          * _OSC method may exist in module level code,
 561          * so it must be run after ACPI_FULL_INITIALIZATION
 562          */
 563         acpi_bus_osc_support();
 564
 565         /*
 566          * _PDC control method may load dynamic SSDT tables,
 567          * and we need to install the table handler before that.
 568          */
 569         acpi_sysfs_init();
 570
 571         acpi_early_processor_set_pdc();
 572
 573         /*
 574          * Maybe EC region is required at bus_scan/acpi_get_devices. So it
 575          * is necessary to enable it as early as possible.
 576          */
 577         acpi_boot_ec_enable();
 578
 579         printk(KERN_INFO PREFIX "Interpreter enabled\n");
 580
 581         /* Initialize sleep structures */
 582         acpi_sleep_init();
 583
 584         /*
 585          * Get the system interrupt model and evaluate \_PIC.
 586          */
 587         result = acpi_bus_init_irq();
 588         if (result)
 589                 goto error1;
 590
 591         /*
 592          * Register the for all standard device notifications.
 593          */
 594         status =
 595             acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
 596                                         &acpi_bus_notify, NULL);
 597         if (ACPI_FAILURE(status)) {
 598                 printk(KERN_ERR PREFIX
 599                        "Unable to register for device notifications\n");
 600                 goto error1;
 601         }
 602
 603         /*
 604          * Create the top ACPI proc directory
 605          */
 606         acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
 607
 608         return 0;
 609
 610         /* Mimic structured exception handling */
 611       error1:
 612         acpi_terminate();
 613         return -ENODEV;
 614 }
 615
 616 struct kobject *acpi_kobj;
 617 EXPORT_SYMBOL_GPL(acpi_kobj);
 618
 619 static int __init acpi_init(void)
 620 {
 621         int result;
 622
 623         if (acpi_disabled) {
 624                 printk(KERN_INFO PREFIX "Interpreter disabled.\n");
 625                 return -ENODEV;
 626         }
 627
 628         acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
 629         if (!acpi_kobj) {
 630                 printk(KERN_WARNING "%s: kset create error\n", __func__);
 631                 acpi_kobj = NULL;
 632         }
 633
 634         init_acpi_device_notify();
 635         result = acpi_bus_init();
 636         if (result) {
 637                 disable_acpi();
 638                 return result;
 639         }
 640
 641         pci_mmcfg_late_init();
 642         acpi_scan_init();
 643         acpi_ec_init();
 644         acpi_debugfs_init();
 645         acpi_sleep_proc_init();
 646         acpi_wakeup_device_init();
 647         return 0;
 648 }
 649
 650 subsys_initcall(acpi_init);