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/acpi_bus.h>
  42 #include <acpi/acpi_drivers.h>
  43 #include <acpi/apei.h>
  44 #include <linux/dmi.h>
  45 #include <linux/suspend.h>
  46
  47 #include "internal.h"
  48
  49 #define _COMPONENT              ACPI_BUS_COMPONENT
  50 ACPI_MODULE_NAME("bus");
  51
  52 struct acpi_device *acpi_root;
  53 struct proc_dir_entry *acpi_root_dir;
  54 EXPORT_SYMBOL(acpi_root_dir);
  55
  56 #define STRUCT_TO_INT(s)        (*((int*)&s))
  57
  58
  59 #ifdef CONFIG_X86
  60 static int set_copy_dsdt(const struct dmi_system_id *id)
  61 {
  62         printk(KERN_NOTICE "%s detected - "
  63                 "force copy of DSDT to local memory\n", id->ident);
  64         acpi_gbl_copy_dsdt_locally = 1;
  65         return 0;
  66 }
  67
  68 static struct dmi_system_id dsdt_dmi_table[] __initdata = {
  69         /*
  70          * Invoke DSDT corruption work-around on all Toshiba Satellite.
  71          * https://bugzilla.kernel.org/show_bug.cgi?id=14679
  72          */
  73         {
  74          .callback = set_copy_dsdt,
  75          .ident = "TOSHIBA Satellite",
  76          .matches = {
  77                 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
  78                 DMI_MATCH(DMI_PRODUCT_NAME, "Satellite"),
  79                 },
  80         },
  81         {}
  82 };
  83 #else
  84 static struct dmi_system_id dsdt_dmi_table[] __initdata = {
  85         {}
  86 };
  87 #endif
  88
  89 /* --------------------------------------------------------------------------
  90                                 Device Management
  91    -------------------------------------------------------------------------- */
  92
  93 acpi_status acpi_bus_get_status_handle(acpi_handle handle,
  94                                        unsigned long long *sta)
  95 {
  96         acpi_status status;
  97
  98         status = acpi_evaluate_integer(handle, "_STA", NULL, sta);
  99         if (ACPI_SUCCESS(status))
 100                 return AE_OK;
 101
 102         if (status == AE_NOT_FOUND) {
 103                 *sta = ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
 104                        ACPI_STA_DEVICE_UI      | ACPI_STA_DEVICE_FUNCTIONING;
 105                 return AE_OK;
 106         }
 107         return status;
 108 }
 109
 110 int acpi_bus_get_status(struct acpi_device *device)
 111 {
 112         acpi_status status;
 113         unsigned long long sta;
 114
 115         status = acpi_bus_get_status_handle(device->handle, &sta);
 116         if (ACPI_FAILURE(status))
 117                 return -ENODEV;
 118
 119         STRUCT_TO_INT(device->status) = (int) sta;
 120
 121         if (device->status.functional && !device->status.present) {
 122                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]: "
 123                        "functional but not present;\n",
 124                         device->pnp.bus_id,
 125                         (u32) STRUCT_TO_INT(device->status)));
 126         }
 127
 128         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]\n",
 129                           device->pnp.bus_id,
 130                           (u32) STRUCT_TO_INT(device->status)));
 131         return 0;
 132 }
 133 EXPORT_SYMBOL(acpi_bus_get_status);
 134
 135 void acpi_bus_private_data_handler(acpi_handle handle,
 136                                    void *context)
 137 {
 138         return;
 139 }
 140 EXPORT_SYMBOL(acpi_bus_private_data_handler);
 141
 142 int acpi_bus_get_private_data(acpi_handle handle, void **data)
 143 {
 144         acpi_status status;
 145
 146         if (!*data)
 147                 return -EINVAL;
 148
 149         status = acpi_get_data(handle, acpi_bus_private_data_handler, data);
 150         if (ACPI_FAILURE(status) || !*data) {
 151                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
 152                                 handle));
 153                 return -ENODEV;
 154         }
 155
 156         return 0;
 157 }
 158 EXPORT_SYMBOL(acpi_bus_get_private_data);
 159
 160 void acpi_bus_no_hotplug(acpi_handle handle)
 161 {
 162         struct acpi_device *adev = NULL;
 163
 164         acpi_bus_get_device(handle, &adev);
 165         if (adev)
 166                 adev->flags.no_hotplug = true;
 167 }
 168 EXPORT_SYMBOL_GPL(acpi_bus_no_hotplug);
 169
 170 static void acpi_print_osc_error(acpi_handle handle,
 171         struct acpi_osc_context *context, char *error)
 172 {
 173         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER};
 174         int i;
 175
 176         if (ACPI_FAILURE(acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer)))
 177                 printk(KERN_DEBUG "%s\n", error);
 178         else {
 179                 printk(KERN_DEBUG "%s:%s\n", (char *)buffer.pointer, error);
 180                 kfree(buffer.pointer);
 181         }
 182         printk(KERN_DEBUG"_OSC request data:");
 183         for (i = 0; i < context->cap.length; i += sizeof(u32))
 184                 printk("%x ", *((u32 *)(context->cap.pointer + i)));
 185         printk("\n");
 186 }
 187
 188 acpi_status acpi_str_to_uuid(char *str, u8 *uuid)
 189 {
 190         int i;
 191         static int opc_map_to_uuid[16] = {6, 4, 2, 0, 11, 9, 16, 14, 19, 21,
 192                 24, 26, 28, 30, 32, 34};
 193
 194         if (strlen(str) != 36)
 195                 return AE_BAD_PARAMETER;
 196         for (i = 0; i < 36; i++) {
 197                 if (i == 8 || i == 13 || i == 18 || i == 23) {
 198                         if (str[i] != '-')
 199                                 return AE_BAD_PARAMETER;
 200                 } else if (!isxdigit(str[i]))
 201                         return AE_BAD_PARAMETER;
 202         }
 203         for (i = 0; i < 16; i++) {
 204                 uuid[i] = hex_to_bin(str[opc_map_to_uuid[i]]) << 4;
 205                 uuid[i] |= hex_to_bin(str[opc_map_to_uuid[i] + 1]);
 206         }
 207         return AE_OK;
 208 }
 209 EXPORT_SYMBOL_GPL(acpi_str_to_uuid);
 210
 211 acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context)
 212 {
 213         acpi_status status;
 214         struct acpi_object_list input;
 215         union acpi_object in_params[4];
 216         union acpi_object *out_obj;
 217         u8 uuid[16];
 218         u32 errors;
 219         struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
 220
 221         if (!context)
 222                 return AE_ERROR;
 223         if (ACPI_FAILURE(acpi_str_to_uuid(context->uuid_str, uuid)))
 224                 return AE_ERROR;
 225         context->ret.length = ACPI_ALLOCATE_BUFFER;
 226         context->ret.pointer = NULL;
 227
 228         /* Setting up input parameters */
 229         input.count = 4;
 230         input.pointer = in_params;
 231         in_params[0].type               = ACPI_TYPE_BUFFER;
 232         in_params[0].buffer.length      = 16;
 233         in_params[0].buffer.pointer     = uuid;
 234         in_params[1].type               = ACPI_TYPE_INTEGER;
 235         in_params[1].integer.value      = context->rev;
 236         in_params[2].type               = ACPI_TYPE_INTEGER;
 237         in_params[2].integer.value      = context->cap.length/sizeof(u32);
 238         in_params[3].type               = ACPI_TYPE_BUFFER;
 239         in_params[3].buffer.length      = context->cap.length;
 240         in_params[3].buffer.pointer     = context->cap.pointer;
 241
 242         status = acpi_evaluate_object(handle, "_OSC", &input, &output);
 243         if (ACPI_FAILURE(status))
 244                 return status;
 245
 246         if (!output.length)
 247                 return AE_NULL_OBJECT;
 248
 249         out_obj = output.pointer;
 250         if (out_obj->type != ACPI_TYPE_BUFFER
 251                 || out_obj->buffer.length != context->cap.length) {
 252                 acpi_print_osc_error(handle, context,
 253                         "_OSC evaluation returned wrong type");
 254                 status = AE_TYPE;
 255                 goto out_kfree;
 256         }
 257         /* Need to ignore the bit0 in result code */
 258         errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0);
 259         if (errors) {
 260                 if (errors & OSC_REQUEST_ERROR)
 261                         acpi_print_osc_error(handle, context,
 262                                 "_OSC request failed");
 263                 if (errors & OSC_INVALID_UUID_ERROR)
 264                         acpi_print_osc_error(handle, context,
 265                                 "_OSC invalid UUID");
 266                 if (errors & OSC_INVALID_REVISION_ERROR)
 267                         acpi_print_osc_error(handle, context,
 268                                 "_OSC invalid revision");
 269                 if (errors & OSC_CAPABILITIES_MASK_ERROR) {
 270                         if (((u32 *)context->cap.pointer)[OSC_QUERY_DWORD]
 271                             & OSC_QUERY_ENABLE)
 272                                 goto out_success;
 273                         status = AE_SUPPORT;
 274                         goto out_kfree;
 275                 }
 276                 status = AE_ERROR;
 277                 goto out_kfree;
 278         }
 279 out_success:
 280         context->ret.length = out_obj->buffer.length;
 281         context->ret.pointer = kmemdup(out_obj->buffer.pointer,
 282                                        context->ret.length, GFP_KERNEL);
 283         if (!context->ret.pointer) {
 284                 status =  AE_NO_MEMORY;
 285                 goto out_kfree;
 286         }
 287         status =  AE_OK;
 288
 289 out_kfree:
 290         kfree(output.pointer);
 291         if (status != AE_OK)
 292                 context->ret.pointer = NULL;
 293         return status;
 294 }
 295 EXPORT_SYMBOL(acpi_run_osc);
 296
 297 bool osc_sb_apei_support_acked;
 298 static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48";
 299 static void acpi_bus_osc_support(void)
 300 {
 301         u32 capbuf[2];
 302         struct acpi_osc_context context = {
 303                 .uuid_str = sb_uuid_str,
 304                 .rev = 1,
 305                 .cap.length = 8,
 306                 .cap.pointer = capbuf,
 307         };
 308         acpi_handle handle;
 309
 310         capbuf[OSC_QUERY_DWORD] = OSC_QUERY_ENABLE;
 311         capbuf[OSC_SUPPORT_DWORD] = OSC_SB_PR3_SUPPORT; /* _PR3 is in use */
 312 #if defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR) ||\
 313                         defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR_MODULE)
 314         capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PAD_SUPPORT;
 315 #endif
 316
 317 #if defined(CONFIG_ACPI_PROCESSOR) || defined(CONFIG_ACPI_PROCESSOR_MODULE)
 318         capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PPC_OST_SUPPORT;
 319 #endif
 320
 321 #ifdef ACPI_HOTPLUG_OST
 322         capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_HOTPLUG_OST_SUPPORT;
 323 #endif
 324
 325         if (!ghes_disable)
 326                 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_APEI_SUPPORT;
 327         if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
 328                 return;
 329         if (ACPI_SUCCESS(acpi_run_osc(handle, &context))) {
 330                 u32 *capbuf_ret = context.ret.pointer;
 331                 if (context.ret.length > OSC_SUPPORT_DWORD)
 332                         osc_sb_apei_support_acked =
 333                                 capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_APEI_SUPPORT;
 334                 kfree(context.ret.pointer);
 335         }
 336         /* do we need to check other returned cap? Sounds no */
 337 }
 338
 339 /* --------------------------------------------------------------------------
 340                              Notification Handling
 341    -------------------------------------------------------------------------- */
 342
 343 static void acpi_bus_check_device(acpi_handle handle)
 344 {
 345         struct acpi_device *device;
 346         acpi_status status;
 347         struct acpi_device_status old_status;
 348
 349         if (acpi_bus_get_device(handle, &device))
 350                 return;
 351         if (!device)
 352                 return;
 353
 354         old_status = device->status;
 355
 356         /*
 357          * Make sure this device's parent is present before we go about
 358          * messing with the device.
 359          */
 360         if (device->parent && !device->parent->status.present) {
 361                 device->status = device->parent->status;
 362                 return;
 363         }
 364
 365         status = acpi_bus_get_status(device);
 366         if (ACPI_FAILURE(status))
 367                 return;
 368
 369         if (STRUCT_TO_INT(old_status) == STRUCT_TO_INT(device->status))
 370                 return;
 371
 372         /*
 373          * Device Insertion/Removal
 374          */
 375         if ((device->status.present) && !(old_status.present)) {
 376                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device insertion detected\n"));
 377                 /* TBD: Handle device insertion */
 378         } else if (!(device->status.present) && (old_status.present)) {
 379                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device removal detected\n"));
 380                 /* TBD: Handle device removal */
 381         }
 382 }
 383
 384 static void acpi_bus_check_scope(acpi_handle handle)
 385 {
 386         /* Status Change? */
 387         acpi_bus_check_device(handle);
 388
 389         /*
 390          * TBD: Enumerate child devices within this device's scope and
 391          *       run acpi_bus_check_device()'s on them.
 392          */
 393 }
 394
 395 /**
 396  * acpi_bus_notify
 397  * ---------------
 398  * Callback for all 'system-level' device notifications (values 0x00-0x7F).
 399  */
 400 static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
 401 {
 402         struct acpi_device *device = NULL;
 403         struct acpi_driver *driver;
 404
 405         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Notification %#02x to handle %p\n",
 406                           type, handle));
 407
 408         switch (type) {
 409
 410         case ACPI_NOTIFY_BUS_CHECK:
 411                 acpi_bus_check_scope(handle);
 412                 /*
 413                  * TBD: We'll need to outsource certain events to non-ACPI
 414                  *      drivers via the device manager (device.c).
 415                  */
 416                 break;
 417
 418         case ACPI_NOTIFY_DEVICE_CHECK:
 419                 acpi_bus_check_device(handle);
 420                 /*
 421                  * TBD: We'll need to outsource certain events to non-ACPI
 422                  *      drivers via the device manager (device.c).
 423                  */
 424                 break;
 425
 426         case ACPI_NOTIFY_DEVICE_WAKE:
 427                 /* TBD */
 428                 break;
 429
 430         case ACPI_NOTIFY_EJECT_REQUEST:
 431                 /* TBD */
 432                 break;
 433
 434         case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
 435                 /* TBD: Exactly what does 'light' mean? */
 436                 break;
 437
 438         case ACPI_NOTIFY_FREQUENCY_MISMATCH:
 439                 /* TBD */
 440                 break;
 441
 442         case ACPI_NOTIFY_BUS_MODE_MISMATCH:
 443                 /* TBD */
 444                 break;
 445
 446         case ACPI_NOTIFY_POWER_FAULT:
 447                 /* TBD */
 448                 break;
 449
 450         default:
 451                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 452                                   "Received unknown/unsupported notification [%08x]\n",
 453                                   type));
 454                 break;
 455         }
 456
 457         acpi_bus_get_device(handle, &device);
 458         if (device) {
 459                 driver = device->driver;
 460                 if (driver && driver->ops.notify &&
 461                     (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS))
 462                         driver->ops.notify(device, type);
 463         }
 464 }
 465
 466 /* --------------------------------------------------------------------------
 467                              Initialization/Cleanup
 468    -------------------------------------------------------------------------- */
 469
 470 static int __init acpi_bus_init_irq(void)
 471 {
 472         acpi_status status;
 473         char *message = NULL;
 474
 475
 476         /*
 477          * Let the system know what interrupt model we are using by
 478          * evaluating the \_PIC object, if exists.
 479          */
 480
 481         switch (acpi_irq_model) {
 482         case ACPI_IRQ_MODEL_PIC:
 483                 message = "PIC";
 484                 break;
 485         case ACPI_IRQ_MODEL_IOAPIC:
 486                 message = "IOAPIC";
 487                 break;
 488         case ACPI_IRQ_MODEL_IOSAPIC:
 489                 message = "IOSAPIC";
 490                 break;
 491         case ACPI_IRQ_MODEL_PLATFORM:
 492                 message = "platform specific model";
 493                 break;
 494         default:
 495                 printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
 496                 return -ENODEV;
 497         }
 498
 499         printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);
 500
 501         status = acpi_execute_simple_method(NULL, "\\_PIC", acpi_irq_model);
 502         if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
 503                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC"));
 504                 return -ENODEV;
 505         }
 506
 507         return 0;
 508 }
 509
 510 u8 acpi_gbl_permanent_mmap;
 511
 512
 513 void __init acpi_early_init(void)
 514 {
 515         acpi_status status;
 516
 517         if (acpi_disabled)
 518                 return;
 519
 520         printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION);
 521
 522         /* enable workarounds, unless strict ACPI spec. compliance */
 523         if (!acpi_strict)
 524                 acpi_gbl_enable_interpreter_slack = TRUE;
 525
 526         acpi_gbl_permanent_mmap = 1;
 527
 528         /*
 529          * If the machine falls into the DMI check table,
 530          * DSDT will be copied to memory
 531          */
 532         dmi_check_system(dsdt_dmi_table);
 533
 534         status = acpi_reallocate_root_table();
 535         if (ACPI_FAILURE(status)) {
 536                 printk(KERN_ERR PREFIX
 537                        "Unable to reallocate ACPI tables\n");
 538                 goto error0;
 539         }
 540
 541         status = acpi_initialize_subsystem();
 542         if (ACPI_FAILURE(status)) {
 543                 printk(KERN_ERR PREFIX
 544                        "Unable to initialize the ACPI Interpreter\n");
 545                 goto error0;
 546         }
 547
 548         status = acpi_load_tables();
 549         if (ACPI_FAILURE(status)) {
 550                 printk(KERN_ERR PREFIX
 551                        "Unable to load the System Description Tables\n");
 552                 goto error0;
 553         }
 554
 555 #ifdef CONFIG_X86
 556         if (!acpi_ioapic) {
 557                 /* compatible (0) means level (3) */
 558                 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
 559                         acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
 560                         acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
 561                 }
 562                 /* Set PIC-mode SCI trigger type */
 563                 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
 564                                          (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
 565         } else {
 566                 /*
 567                  * now that acpi_gbl_FADT is initialized,
 568                  * update it with result from INT_SRC_OVR parsing
 569                  */
 570                 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
 571         }
 572 #endif
 573
 574         status = acpi_enable_subsystem(~ACPI_NO_ACPI_ENABLE);
 575         if (ACPI_FAILURE(status)) {
 576                 printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
 577                 goto error0;
 578         }
 579
 580         /*
 581          * If the system is using ACPI then we can be reasonably
 582          * confident that any regulators are managed by the firmware
 583          * so tell the regulator core it has everything it needs to
 584          * know.
 585          */
 586         regulator_has_full_constraints();
 587
 588         return;
 589
 590       error0:
 591         disable_acpi();
 592         return;
 593 }
 594
 595 static int __init acpi_bus_init(void)
 596 {
 597         int result;
 598         acpi_status status;
 599
 600         acpi_os_initialize1();
 601
 602         status = acpi_enable_subsystem(ACPI_NO_ACPI_ENABLE);
 603         if (ACPI_FAILURE(status)) {
 604                 printk(KERN_ERR PREFIX
 605                        "Unable to start the ACPI Interpreter\n");
 606                 goto error1;
 607         }
 608
 609         /*
 610          * ACPI 2.0 requires the EC driver to be loaded and work before
 611          * the EC device is found in the namespace (i.e. before acpi_initialize_objects()
 612          * is called).
 613          *
 614          * This is accomplished by looking for the ECDT table, and getting
 615          * the EC parameters out of that.
 616          */
 617         status = acpi_ec_ecdt_probe();
 618         /* Ignore result. Not having an ECDT is not fatal. */
 619
 620         status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
 621         if (ACPI_FAILURE(status)) {
 622                 printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
 623                 goto error1;
 624         }
 625
 626         /*
 627          * _OSC method may exist in module level code,
 628          * so it must be run after ACPI_FULL_INITIALIZATION
 629          */
 630         acpi_bus_osc_support();
 631
 632         /*
 633          * _PDC control method may load dynamic SSDT tables,
 634          * and we need to install the table handler before that.
 635          */
 636         acpi_sysfs_init();
 637
 638         acpi_early_processor_set_pdc();
 639
 640         /*
 641          * Maybe EC region is required at bus_scan/acpi_get_devices. So it
 642          * is necessary to enable it as early as possible.
 643          */
 644         acpi_boot_ec_enable();
 645
 646         printk(KERN_INFO PREFIX "Interpreter enabled\n");
 647
 648         /* Initialize sleep structures */
 649         acpi_sleep_init();
 650
 651         /*
 652          * Get the system interrupt model and evaluate \_PIC.
 653          */
 654         result = acpi_bus_init_irq();
 655         if (result)
 656                 goto error1;
 657
 658         /*
 659          * Register the for all standard device notifications.
 660          */
 661         status =
 662             acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
 663                                         &acpi_bus_notify, NULL);
 664         if (ACPI_FAILURE(status)) {
 665                 printk(KERN_ERR PREFIX
 666                        "Unable to register for device notifications\n");
 667                 goto error1;
 668         }
 669
 670         /*
 671          * Create the top ACPI proc directory
 672          */
 673         acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
 674
 675         return 0;
 676
 677         /* Mimic structured exception handling */
 678       error1:
 679         acpi_terminate();
 680         return -ENODEV;
 681 }
 682
 683 struct kobject *acpi_kobj;
 684 EXPORT_SYMBOL_GPL(acpi_kobj);
 685
 686 static int __init acpi_init(void)
 687 {
 688         int result;
 689
 690         if (acpi_disabled) {
 691                 printk(KERN_INFO PREFIX "Interpreter disabled.\n");
 692                 return -ENODEV;
 693         }
 694
 695         acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
 696         if (!acpi_kobj) {
 697                 printk(KERN_WARNING "%s: kset create error\n", __func__);
 698                 acpi_kobj = NULL;
 699         }
 700
 701         init_acpi_device_notify();
 702         result = acpi_bus_init();
 703         if (result) {
 704                 disable_acpi();
 705                 return result;
 706         }
 707
 708         pci_mmcfg_late_init();
 709         acpi_scan_init();
 710         acpi_ec_init();
 711         acpi_debugfs_init();
 712         acpi_sleep_proc_init();
 713         acpi_wakeup_device_init();
 714         return 0;
 715 }
 716
 717 subsys_initcall(acpi_init);